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Dissertations / Theses on the topic 'WVC'

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Published: 4 June 2021
Last updated: 2 February 2022

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1

Eichhorn, Sven. "Berechnungsansatz für Strukturbauteile aus Holzfurnierlagenverbundwerkstoff – WVC." Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-106007.

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Es wird ein einfacher Berechnungsansatz für ein Baukastensystem aus Kastenprofilen verschiedener Querschnittsabmessungen erarbeitet. Diese Profile bestehen aus WVC (Wood Veneer Composites, Holzfurnierlagenverbundwerkstoffen). Der Ansatz bildet den statischen Lastfall und das Ermüdungsverhalten unter schwellende Dreipunktbiegung ab. Am Beispiel eines ausgewählten Strukturbauteils aus handelsüblichen Birkensperrholz wird der Berechnungsansatz konkretisiert und durch Versuche evaluiert. Aufbauend auf dem Kraft-Verformungsverhalten der analysierten Einzelbauteile und der kapillarporösen Struktur des Holzes wird bei dem Berechnungsansatz auf eine Analyse der Spannungen verzichtet. Stattdessen wird als Berechnungskriterium die kritische Normaldehnung in der Randfaser der Strukturbauteile genutzt. Weiterhin wird eine Methode vorgestellt um mittels niederzyklischen Ermüdungsversuchs (LCF, ca. 1e+03 Lastwechsel) den „Knickpunkt“ der Zeitfestigkeitslinie eines einstufigen Ermüdungsversuchs bei hohen Lastspielzahlen (HCF, 1e+06 bis 1e+07 Lastwechsel) für diese Strukturbauteile zu bestimmen
It was developed a simple approach for the calculation of a modular construction system for box sections (profile structures) of different cross-sectional dimensions. These profile structures consists of WVC (Wood Veneer Composites). The approach maps the static load case and the fatigue behavior under pulsating three-point bending. By using a structural component made from commercial birch plywood, the calculation approach is specified and verified. Based on the force-deformation behavior of the analyzed single components in connection with the capillary-porous structure of the wood, the calculation approach dispense on an analysis of the tensions. Instead, a criterion, which calculates the critical normal strain in the outer fibers of the structural components, is used. Furthermore, a method of a low-cycle fatigue test (LCF, abbr. 1e+03 cycles) is presented. This method detects the “knee point" of the fatigue limit line for the profiles. That point is usually determined by the use of a high-cycle fatigue tests (HCF, 1e+06 until 1e+07 cycles)
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2

Eckardt, Ronny, and Sven Eichhorn. "Konstruktion und Erprobung modularer Maschinengestelle aus Holzfurnierlagenverbundwerkstoff (WVC)." Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-61046.

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Durch die Entwicklung der vorgestellten modularen Bauweise ist es möglich, Maschinengestelle aus Holzfurnierlagenverbundwerkstoff (WVC) einfach herzustellen und technisch sinnvoll einzusetzen. Die modulare Bauweise kann sowohl für statische als auch dynamische Beanspruchungen im Allge-meinen Maschinenbau angewendet werden. In einem Baukastensystem werden Maschinenteile aus WVC durch geeignete Verbindungsmittel lösbar zusammengesetzt. Damit ist es möglich, eine hohe Flexibilität in der späteren Nutzung mit einer hohen Variantenvielfalt des Aufbaus durch entsprechend verschiedene Bauteile zu kombinieren. Im Vortrag werden die verschiedenen Belastungen des Holzverbundes im Maschinenaufbau charakte-risiert und auf Probleme bei der Konstruktion eingegangen. Abschließend werden Ergebnisse zu Dau-eruntersuchungen der Verbindungstechnik und des gesamten Maschinenaufbaus vorgestellt und diskutiert
The development of the presented modular construction allows to manufacture wood veneer compos-ite (WVC) machine racks easily in a technical reasonable way. The modular construction can be used for both static and dynamic loading conditions in mechanical engineering. In the modular construction system the WVC machine components are connected detachable with adequate fasteners. This leads to high flexibility during the construction and assembly process of machine components. In the current presentation the different loading conditions of WVC profiles are characterized and the problems during construction described. Finally the results of the long term testing of the connection technique are presented and the complete machine system is discussed
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3

Eichhorn, Sven [Verfasser], Klaus [Akademischer Betreuer] Nendel, Klaus [Gutachter] Nendel, and André [Gutachter] Wagenführ. "Berechnungsansatz für Strukturbauteile aus Holzfurnierlagenverbundwerkstoff – WVC : Berechnungsansatz für Strukturbauteile ausHolzfurnierlagenverbundwerkstoff – WVC / Sven Eichhorn ; Gutachter: Klaus Nendel, André Wagenführ ; Betreuer: Klaus Nendel." Chemnitz : Universitätsbibliothek Chemnitz, 2013. http://d-nb.info/1214245064/34.

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4

Eichhorn, Sven, Ronny Eckardt, and Christoph Müller. "Integrative Bauweisen mit Holzfurnierlagenverbundwerkstoff (WVC) für den Maschinen- und Anlagenbau." Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-79120.

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Aufbauend auf historischen Anwendungen von Holzwerkstoffen in der Technik werden Vor- und Nachteile aus der Sicht des Maschinenbaus dargestellt sowie eine aktuelle Eignung dahingehend diskutiert. Besondere Aufmerksamkeit erfährt der integrative Leichtbau mit Holzfurnierlagenverbundwerkstoffen (Wood Veneer Composite, WVC). Durch deren modifizierbares Eigenschaftsprofil, in Verbindung mit einer an den Anwendungsfall angepassten Bauweise, ist eine zusätzliche Funktionsintegration möglich. Das Potenzial der Holzwerkstoffe wird an verschiedenen Konstruktionsbeispielen erläutert. Ergänzend werden Biege-Ersatz Emodul und Bauteilverformung eines Strukturelementes sowie Ergebnisse aus Ermüdungsversuchen der Verbindungstechnik dargestellt. Abschließend werden Probleme beider Umsetzung verschiedener Prototypen beschrieben und deren Lösung aufgezeigt
Based on several historical applications of Wood Veneer Composites (WVC) the advantages and disadvantages of wood materials in today`s mechanical and plant engineering are discussed. Integrated WVC lightweight structures are especially taken into account. The highly modifiable mechanical properties of WVC’s allow application-adapted integration of further technical functions. The capabilities of integrated lightweight structures based on wood materials are demonstrated on several technical applications. Furthermore results of flexural tests, precisely the retrieved substitutet bending modulus and the maximal deflection as well as results of fatigue testing of the connecting components are given. Finally problems occurring during realization of WVC lightweight prototypes and their potential solutions are shown
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5

Eichhorn, Sven, Ronny Eckardt, Christoph Alt, and Klaus Nendel. "Verwendung von Holzwerkstoffen in Fördertechnik der Automobilfertigung." Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-203240.

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Aufbauend auf einer an der TU Chemnitz, Professur Fördertechnik, Forschungsgruppe Anwendungstechnik Erneuerbarer Werkstoffe entwickelten Holzbauweise für den Maschinenbau, wird die tragende Anwendung von Holzwerkstoffen innerhalb der Fördertechnik der Automobilfertigung aufgezeigt. Am Beispiel von Skidfördertechnik aus WVC (Wood Veneer Composite) bei der Volkswagen AG in Wolfsburg, wird der Transfer von Forschungsergebnissen thematisiert. Dabei wird die Entwicklung und Umsetzung verschiedener Skidförderer in Holzbauweise bis zur Serienanwendung dargestellt. Die Schwerpunkte der Darstellung sind ausgewählte, konstruktiv relevante Aspekteund ein Vergleich zu den tradierten metallischen Bauweisen.
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6

Eichhorn, Sven, Frank Rasch, Ronny Eckardt, Jens Sumpf, and Klaus Nendel. "Nachhaltigkeit und Energieeffizienz in der Intralogistik durch neue Systemkomponenten." Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-99946.

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Der gesellschaftlich in den Fokus rückende Faktor der Klima- und Energieeffizienz von technischen Produkten eröffnet Unternehmen die Möglichkeit, ihre unternehmerischen Gesellschaftsverantwortung (CSR - Cooperate Social Responsybility) zu definieren und mit konkreten wirtschaftlichen Vorteilen zu verknüpfen. Kerngedanke der CSR ist der Ansatz der Nachhaltigkeit. Den folgenden Generationen soll ein intaktes ökologisches, soziales und ökonomisches Gefüge hinterlassen und dabei langfristig bilanzierbare Gewinne erwirtschaftet werden. Für die technische Intralogistik resultiert daraus die Anforderung, nachhaltige und ressourceneffiziente Systemkomponenten, Systeme und Prozesse („Green Logistics“ oder „grüne Fördertechnik“) bereitzustellen.
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7

Eichhorn, Sven, Frank Rasch, Ronny Eckardt, Jens Sumpf, and Klaus Nendel. "Nachhaltigkeit und Energieeffizienz in der Intralogistik durch neueSystemkomponenten: Nachhaltigkeit und Energieeffizienz in der Intralogistik durch neueSystemkomponenten." Tagungsband Intelligent vernetzte Arbeist- und Farbriksysteme - VPP2012 - Vernetzt planen und produzieren & Symposium Wissenschaft und Praxis, S. 239 -248, 2012. https://monarch.qucosa.de/id/qucosa%3A19803.

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Der gesellschaftlich in den Fokus rückende Faktor der Klima- und Energieeffizienz von technischen Produkten eröffnet Unternehmen die Möglichkeit, ihre unternehmerischen Gesellschaftsverantwortung (CSR - Cooperate Social Responsybility) zu definieren und mit konkreten wirtschaftlichen Vorteilen zu verknüpfen. Kerngedanke der CSR ist der Ansatz der Nachhaltigkeit. Den folgenden Generationen soll ein intaktes ökologisches, soziales und ökonomisches Gefüge hinterlassen und dabei langfristig bilanzierbare Gewinne erwirtschaftet werden. Für die technische Intralogistik resultiert daraus die Anforderung, nachhaltige und ressourceneffiziente Systemkomponenten, Systeme und Prozesse („Green Logistics“ oder „grüne Fördertechnik“) bereitzustellen.
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8

Müller, Christoph, Sven Eichhorn, Detlef Krug, and Andreas Weber. "Holzwerkstoffe in technischen Anwendungen – Anforderungen aus Sicht des Maschinenbaus." Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-95423.

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Im Vortrag werden die Holzwerkstoffe charakterisiert und anderen Konstruktionswerkstoffen und technischen Verbundmaterialien gegenüber gestellt. Anhand eines Ausführungsbeispiels wird deren technologische und wirtschaftliche Leistungsfähigkeit analysiert. Darauf aufbauend werden notwendige Maßnahmen zur Verbesserung der Werkstoffe sowie zu deren Etablierung in der Technik dargestellt. Aus dem Vergleich der jeweiligen Eigenschaftsprofile werden zukünftige Nutzungsmöglichkeiten der Holzwerkstoffe in der Technik abgeleitet. Ein Ausblick zeigt den möglichen Entwicklungsspielraum für Holzwerkstoffe in technischen Anwendungen
The properties of wood materials are compared to several engineering materials, like metal alloys, polymers and fiber reinforced plastics. The technologic and economic efficiency of plywood is illustrated by the implementation of a wooden beam. Accordingly necessary measures for the improvement of wood materials and their recognition in mechanical engineering are shown. A perspective of further fields of applications for wood materials in a technical context is given
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9

Eichhorn, Sven, Ronny Eckardt, and Christoph Müller. "Einblick in die Geschichte der Holzwerkstoffe im Maschinen- und Anlagenbau und aktuelle Möglichkeiten der angemessenen technischen Nutzung." Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-61031.

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Der Einsatz von Holz- und speziell Holzfurnierlagenverbundwerkstoffen (WVC) konzentrierte sich in den vergangen Jahrzehnten nahezu ausschließlich auf den Möbelbau und den Bausektor. Eine Verwendung von Holzwerkstoffen im Sinne einer angemessenen technischen Nutzung der vorhandenen Eigenschaften im Maschinen- und Anlagenbau wird hingegen aktuell kaum praktiziert. Der Vortrag zeigt anhand der Darstellung und Analyse des Standes der Technik Einsatzmöglichkeiten des Werkstoffes im Maschinen- und Anlagenbau auf und charakterisiert dabei die Bereiche, in denen noch verstärkt gearbeitet werden muss, um diese Einsatzmöglichkeiten angemessen nutzen zu können. Weiterhin werden grundlegend relevante Werkstoffeigenschaften für das angestrebte Einsatzgebiet charakterisiert und erste Einblicke in Bauformen aus WVC gegeben, mit denen ein praktischer Einsatz im Allgemeinen Maschinenbau und damit in der Fördertechnik technisch sinnvoll ist
For the last decades the usage of plywood materials (Wood Veneer Composites) was mainly focused on furniture and civil engineering. At the moment there is no adequate technical use of wood based materials in mechanical engineering in respect to its particular properties. Following the state of the art several fields of application in mechanical engineering are presented as well as subjects were identified which need further investigation. Relevant material properties for the aspired technical application are characterized. Furthermore an insight in realized designs of WVC structures is given
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10

Schubert, Maria. "Carbon partitioning in nitrogen fixing root nodules." Doctoral thesis, [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=96736597X.

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11

Eckardt, Ronny, and Sven Eichhorn. "Neue Bauweisen in der Intralogistik durch Holzverbundwerkstoffe - Verbindungselemente für dynamische Belastungen." Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-61936.

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In der technischen Logistik bieten Bauweisen aus Holzverbundwerkstoffen, speziell aus schichtförmigen aufgebauten Halbzeugen (WVC – Wood-Veneer- Composites), eine Alternative zu Konstruktionen aus Metallwerkstoffen, vor allem aufgrund ihrer guten spezifischen mechanischen Eigenschaften sowie ihrer günstigen Korrosionseigenschaften. Benötigte Verbindungsmittel entstammen dabei dem Bau- oder Möbelsektor und sind vorrangig statischen Belastungen angepasst. Der Vortrag gibt einen kurzen Einblick in Bauweisen mit WVC und stellt dabei Forschungsergebnisse zu statischen und dynamischen Untersuchungen an prinzipiell geeigneten Verbindungselementen in den Vordergrund. Dabei wird vor allem auf holztypische Problemstellungen im Zusammenhang mit dynamischen Belastungen eingegangen. An Funktionsmustern werden mögliche Anwendungen in der Fördertechnik, speziell für den Stückguttransport, dargestellt.
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12

Eichhorn, Sven, Ronny Eckardt, and Christoph Müller. "Schwingungs- und geräuschdämpfende Leichtbauelemente im Maschinenbau auf Basis von Konstruktionswerkstoffen aus Holz." Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000990.

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Im Forschungsprojekt wurde eine Bauweise für ein modular aufgebautes und flexibel einsetzbares Gestellsystem entwickelt, welches durch integrativen Leichtbau den vorteilhaften Einsatz von Holzfurnierlagenverbund-werkstoffen (WVC) für Verarbeitungs- und Fördermaschinen ermöglicht. Die ingenieurtechnisch relevanten Eigen-schaften des Holzbasiswerkstoffs (u.a. strukturelle Dämpfungseigenschaft) wurden ermittelt und darauf aufbauend ein Profil als Strukturelement des Gestellsystems entwickelt. Hier lag besonderes Augenmerk auf der Gestaltung des Profilquerschnitts. Es wurden verschiedene Querschnittsgeometrien vergleichend untersucht, wobei sich ein ge-schlossenes Kastenprofil als günstig erwies. Ausgehend vom entwickelten Profil wurde die für ein modulares Sys-tem notwendige Verbindungstechnik konzipiert. Folgend wurde schrittweise die modulare Bauweise in Strukturein-heiten umgesetzt sowie parallel Untersuchungen zu Steifigkeit und Festigkeit der Profile fortgeführt. Während der Erprobung von Struktureinheiten unter praxisnahen Bedingungen wurden gewisse konstruktive Verbesserungspo-tentiale deutlich. Diese Änderungen sowie die gewonnenen Erkenntnisse aus der Material- und Strukturprüfung kamen im Prototyp zur Umsetzung. Schallpegelprofile verschiedener fördertechnischer Anlagen und des entwickel-ten Prototypen wurden abschließend aufgenommen und verglichen
Aim of the present study was to develop a modular designed and widely employable rack system. Positive properties of wood based materials (WVC) in lightweight structures were identified and integrated for the application in fabri-cation and conveyer technologies. For this purpose relevant properties of wood materials had been investigated (e.g. damping properties). The results of these analyses were the basis for the development of a beam profile, the basic structural design element for the future rack system. The most effort was put into finding the optimal beam cross section. Several different cross sections had been compared, a square sectional beam profile showed the best per-formance. Based on the square sectional beam profile proper connection methods for the modular rack were devel-oped. Structural units were subsequently realized step by step, while the investigation of stiffness and strength of the profiles was continued. The testing of the structural units under simulated field conditions revealed some minor constructional improvement capabilities. The constructional improvements and the knowledge from the material and profile testing were put into practice in the prototype. Finally sound measurements were carried out to compare several conveyors made of different materials (including the prototype) in respect to the emitted sound level
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13

S:t, Clair Renard Carl. "Injection molding WPC." Thesis, KTH, Industriell produktion, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-57943.

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The use of wood-plastic composites, WPC, in commercial products is today limited. Current WPC products on the market are to a large extent limited to extruded products. There are strong reasons to increase the use of WPC. WPC can be manufactured from used plastic that otherwise cannot be recycled. This paper gives a brief description of the manufacturing of WPC, including wood filler treatment, the role of coupling agents and compounding. It describes the machinery used for producing WPC, and gives a introduction to mold manufacturing.The use of WPC as an alternative to pure thermoplastics in injection molding processes is discussed. Furthermore it is described how WPCs differ from pure thermoplastics in terms of chemical and physical properties. The paper also describes the consequences of these properties in an injection molding cycle. The work finally puts focus on how to obtain process optimization through better understanding of pressure and temperature throughout the injection molding cycle.
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14

Korn, Sandra. "Experimentelle Untersuchung der Wasseraufnahme und der hydraulischen Eigenschaften des Wurzelsystems von sechs heimischen Baumarten." Doctoral thesis, [S.l.] : [s.n.], 2004. http://webdoc.sub.gwdg.de/diss/2004/korn/korn.pdf.

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15

Farnsworth, Lila Nicole. "FACTORS IN BREASTFEEDING INITIATION AMONG CENTRAL KENTUCKY WIC AND NON-WIC PARTICIPANTS." UKnowledge, 2014. http://uknowledge.uky.edu/foodsci_etds/19.

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Vital statistics data were statistically analyzed to determine who is breastfeeding in central Kentucky and if factors differ between those in a WIC and non-WIC population. The sample consisted of 479 postpartum women aged 18-44 in central Kentucky. Participants in the study were analyzed as a whole, then divided by their participation in the WIC program (n=304) or non-participation in the WIC program (n=175). Variables recorded in the vital statistics form were analyzed. These variables included age, education level, marital status, and ethnicity of the mother, household income status, and gender, gestational age, and birth weight of the infant. In the population studied, education level, ethnicity, marital status, household income status, and gestational age of the infant were significantly different between mothers who initiated breastfeeding and those who did not. In the WIC population, mothers were more likely to initiate breastfeeding if they were of non-white ethnicity or if the infant was born at greater than 37 weeks gestation; whereas, in the non-WIC population, mothers were more likely to initiate breastfeeding if they had some college or a college degree or if they were not enrolled in Medicaid. WIC participants were significantly less likely to initiate breastfeeding than non-WIC participants.
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16

Terrell, Joyce L. "Social Ecological Influences of WIC Programming Behavior Change of Former WIC Participants." ScholarWorks, 2015. https://scholarworks.waldenu.edu/dissertations/1661.

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The Special Supplemental Women, Infants, and Children (WIC) Program is one of many United States Department of Agriculture's (USDA) food subsidy programs that serves 8.6 million participants, deemed nutritionally at risk. WIC is designed to influence nutritional and health behaviors to a population least capable of functioning. The purpose of this study was to identify if participation in WIC's nutrition education activities and restricted use of food subsidy benefits had a post-factorial effect on their nutritional behaviors. This study provides data on Bronfenbrenner's social ecological influences and how it impacts on long-term behavioral change. A quantitative causal-comparative design utilizing a convenience sampling method compared responses to a survey on nutritional habits of women shoppers at a Walmart retailer in an urban southeastern metropolitan city. The study population included women aged 18-50 years with one or more child who had or were currently receiving WIC (n = 63) compared with controls (n = 32) who also met the aforementioned criteria, yet did not receive WIC. Analyses of a Wilcoxon signed rank test supported an association between participation in WIC and an influence on participants' food purchase habits, while evidence from a linear equation for repeated measures between groups did not support a common variable for what influenced purchases between cases and controls. This study provides insight for future study regarding WIC's effectiveness to promote long-term health for its participants. It may also lend to discussion by USDA officials to consider programmatic review and change of other food subsidy programs which conceivably could impact the diets of more than 49 million Americans.
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17

Eichhorn, Sven, and Brit Clauß. "WPC – Maschinenelemente in Fördersystemen." Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000886.

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Ziel der Untersuchung war es, eine Charakterisierung des Dauerlaufverhaltens dynamisch und tribologisch belasteter Maschinenteile aus Wood Polymer Composite (WPC) in tragenden Anwendungen durchzuführen. Zu diesem Zweck wurde ein Hybridprofil aus Aluminium und WPC (70% PP, 30 % Weichholz) zu dem bestehenden Profil aus Aluminium in ein Hängefördersystem eingebaut und die dynamische Belastung (Vertikalbeschleunigung) auf das Fördergut während des Anlagenbetriebes gemessen. Im Testbetrieb wurde das System mit Ersatzlasten beladen und die Amplituden der Vertikalbeschleunigung zu Versuchsbeginn und deren Veränderung nach 1000h Laufzeit hinsichtlich beider Profilarten bewertet und das Hybridprofil auf sichtbare Schäden überprüft. Zu Beginn und nach 1000h Versuchszeit waren keine relevanten Veränderungen des charakteristischen Beschleunigungsbildes bezüglich beider Profilaufbauten feststellbar. Trotz Verschleiß am Antrieb des Fördersystems blieb das Hybridprofil voll funktionsfähig (kein sichtbarer Verschleiß, keine merkliche Schädigung). Darauf aufbauend wird der Versuch mit höherer Belastung fortgesetzt und die Entwicklung eines Profils, welches nur aus WPC besteht, vorangetrieben
Aim of the study was to analyze the characteristics of dynamic and tribological stressed wood polymer machine elements. For this purpose an endurance test with an overhead conveyor was executed. A sectional beam in hybrid design (Aluminum & WPC [70 % PP / 30 % softwood]) was implemented in this aluminum beam overhead conveyor. During the conveying process the vertical acceleration of the transported material (dummy loads) was measured. At the beginning of the endurance test the acceleration patterns of the aluminum and the hybrid beams did not differ. Despite of mechanical wear of the drive system after 1000 operating hours, alterations of the acceleration patterns still could not be detected in the different beams. The hybrid beam remained fully functional with no visible wear or damage after 1000 operating hours. Based on these encouraging results the endurance test is continued with enhanced dummy loads and the development of a beam completely composed of WPC is aspired
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18

Eckardt, Ronny. "Untersuchungen an Verbindungselementen für Holzkonstruktionen im Maschinen- und Anlagenbau." Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-106287.

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In dieser Arbeit werden Berechnungsvorschriften für Insertverbindungen in Holzfurnierlagenverbundwerkstoffen (WVC) mit dem Ziel erstellt, diese zur Auslegung und Nachweisführung in Anwendungen des Maschinenbaus zu verwenden. Nach Definition eines entsprechenden Anforderungsprofils erfolgt eine umfangreiche Darstellung des Standes der Technik. Dabei wird speziell auf die rechnerische Nachweisführung von Verbindungen im Bauwesen eingegangen, schwerpunktmäßig durch die im Eurocode 5 (DIN EN 1995) definierten Modelle für stiftförmige Verbindungsmittel. Im zweiten, praktischen Teil der Arbeit erfolgt die Durchführung und Auswertung umfangreicher Versuche. Dabei werden in einem ersten Schritt wesentliche Materialkennwerte der verwendeten Holzwerkstoffe bestimmt. Die zweite Gruppe der experimentellen Untersuchungen hat das Trag- und Verformungsverhalten vollständiger Insertverbindungen zum Inhalt. Dabei werden die unter statischen Aspekten wichtigen Einflussparameter auf die Tragfähigkeit bei Belastungen in Richtung sowie quer zur Stiftachse bestimmt und geometrische Vorzugsparameter ermittelt. Unter deren Zugrundelegung erfolgt eine Ausweitung der experimentellen Untersuchungen auf dynamische Lastfälle durch eine Ableitung von Wöhlerlinien bei Zugschwellbelastung. Auf Grundlage der durchgeführten Versuche werden Modelle zur Berechnung von Insertverbindungen nach den Methoden des Ingenieurholzbaus abgeleitet. Deren Anwendbarkeit wird an einem konkreten Beispiel in Form einer Transportrollenbahn für die Verwendung in der technischen Intralogistik demonstriert
In this work, calculation fundamentals for insert fastenings in wood veneer composites (WVC) are developed with the aim to use them for the dimensioning and verification in mechanical engineering applications. After defining the functional requirements there is a comprehensive description of the best demonstrated available technology. The arithmetical verifications of connections used in civil engineering are thereby specifically addressed with the main focus on defined models for dowel type fasteners within Eurocode 5 (EN 1995). In the second part of the work comprehensive technical tests are implemented and evaluated. At first essential material properties of the used wood materials are determined. The following experiments contain the load bearing and deformation behavior of complete insert connections. The determination of important influencing parameters of the statical strength under axial and traverse loads is thereby involved, followed by an extension on dynamic load cases by a derivative of Woehler curves (stress - cycle diagram). Based on these experiments are models derived to provide calculation fundamentals to dimension insert connections. The practical applicability of the developed specifications is shown by dimensioning the connections of a roller conveyor made of WVC (technical logistics)
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Alrutz, Neen Blackwell. "A comparison of weight gains during pregnancy of WIC and non-WIC clinic samples." Thesis, Virginia Tech, 1985. http://hdl.handle.net/10919/41631.

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The purpose of this study was to find the difference, if any, between the weight gain patterns during pregnancy of women attending public health clinics in Northern Virginia who were enrolled in the NIC program and women not enrolled in the NIC program. Women on the NIC program during pregnancy were identified from NIC files. The control group was chosen from among women who were shown to be both nutritionally at risk and eligible for NIC based on income, but who were not receiving NIC benefits during pregnancy.

The sample consisted of M8 subjects in each group who met certain other selection criteria. With the exception of income, there was no statistically significant difference when selected maternal and infant variables were compared.

There was no significant difference (p>.O5) between total weight gain of the two groups, although the NIC mothers gained slightly more during pregnancy than the non-NIC mothers. A series of t-tests, performed between the means of the weekly weight gains, showed no significant difference in the weekly weight gain of the two samples at any week of pregnancy.

Both samples had increased weekly weight gains near the end of pregnancy - the mean of the non-WIC group was higher and occurred slightly later than did that of the WIC group. These higher means near the end of pregnancy for the non-WIC group resulted in statistically significant differences in the two groups when comparing the last part of pregnancy and suggest that the non-WIC group is gaining a larger amount of weight very late in pregnancy.


Master of Science
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20

Hansen, Marcia M. "Digital literacies and WAC/WID." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/4990.

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Thesis (M.A.)--University of Missouri-Columbia, 2007.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on October 26, 2007) Vita. Includes bibliographical references.
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Lindberg, Erik, and Lukas Magnusson. "WEC Back-to-back Topology." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-351912.

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22

Salar, Dana. "Miniature Wave Energy Converter (WEC)." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-366760.

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Abstract     In this project, I present a design of a scale model of a linear generator (LG) similar to a full size Wave Energy Converter (WEC) being developed at Uppsala University since 2002 and commercialized by Seabased AB. The purpose of a WEC is to convert the energy from ocean waves into electrical energy. In order to implement the behaviour of the prototype design, a preliminary study has been done to further build it for use in education, laboratory tests and research. The challenge with this project is to scale down the WEC but maintain the shape, appearance and characteristics of the generator for educational purposes. A miniature version of a WEC, previously developed by Uppsala University in collaboration with Seabased Industry AB, has been designed with scaling rate 1:14 of the linear dimensions. In this case, the value of the output power is not important- it has simply been calculated. The electrical rated parameters of the three phase generator are power  26 W,  peak line-line voltage  13 V and  rated armature current  2 A. The mechanical parameters utilized in the design are the total length and the diameter of the miniature WEC, 50 cm and 25 cm, respectively. The simulated prototype model (described in Section 5.4) has been validated with an experimental setup comprising translator and stator (described in Section 5.1), where the translator is moved by a programmed industrial robot. The experimental results have shown good agreement with the simulations.
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Joseph, Enas. "An evaluation of the impact of WIC educational classes on the knowledge attained by WIC participants." CSUSB ScholarWorks, 1997. https://scholarworks.lib.csusb.edu/etd-project/1479.

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24

Clauß, Brit, Michael Gehde, Klaus Nendel, and Sven Eichhorn. "Weiterverarbeitung von WPC für technische Anwendungen." Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000968.

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Die im Folgenden vorgestellten Arbeiten sollen zur Erweiterung der Einsatzmöglichkeiten von WPC-Bauteilen beitragen, wobei die Untersuchung möglicher Fügetechnologien und ein praxisnahes Anwendungsbeispiel die Schwerpunkte bilden. Mittels Heizelement- und Vibrationsschweißens ist es gelungen, WPC-Bauteile sowohl mit gleichen Materialien als auch mit dem jeweiligen reinen Matrixmaterialien in Mischbauweisen zu verbinden. Deutlich werden hierbei verfahrensbedingte Einflüsse der Temperaturen bzw. des Energieeintrages, der Krafteinleitung (Fügedruck) sowie rezepturbedingte Einflüsse des Anteiles von Haftvermittlern. Durch entsprechende Verfahrensführung können Festigkeiten der Schweißverbindung im Bereich der WPC-Grundmaterialfestigkeit erreicht werden. Im Praxistest wurde das Dauerlaufverhalten eines Hybridprofils aus Aluminium und WPC in einem Hängefördersystem unter dynamischen Belastungen untersucht. Die Ergebnisse zeigen, dass die WPC-Bauteile des Hybriden den unterschiedlichen Beanspruchungen und den daraus resultierenden Verformungen nach in Summe 3000 h Testbetrieb, ohne sichtbare Schäden standhielten. Weiterhin waren keine Nachteile bezüglich der Praxistauglichkeit im Vergleich zu dem Standardprofil aus Aluminium feststellbar.
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Gustafsson, Staffan, and Linus Adre. "Alternativ utformning av WTC i Växjö." Thesis, Linnéuniversitetet, Institutionen för teknik, TEK, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-19542.

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Stationsområdet i Växjö genomgår omfattande förändringar, där bland annat planer för ett WTC finns. Ett förslag på nämnda byggnad har tagits fram, men det fick kritik. Man menade att det inte stämde in i stadsbilden. Vårt syfte och mål har därför varit att ta fram alternativa förslag på utformning av ett WTC, med hänsyn till kritiken. Vår metod bestod i att sätta oss in befintliga detaljplaner och utföra eget skissningsarbete. Detta har resulterat i två förslag på utformning, som sedan jämförs och analyseras utifrån en uppsättning värderingspunkter. Från detta följer en diskussion där vi dragit en del slutsatser, som blir vårt inlägg i den pågående diskussionen om detaljplanen.
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Loroña, Nicole Catalina, and Nicole Catalina Loroña. "Facilitators to Breastfeeding Among WIC Participants." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/625046.

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Purpose: This study was developed to assess the facilitators to breastfeeding in the Pima County Women, Infants, and Children Program (WIC) in order to inform programming and improve breastfeeding rates. Background: Although breastfeeding for at least six months has numerous maternal and child health benefits, and is promoted by WIC, WIC women have historically had low breastfeeding rates. Improving lower than desired breastfeeding rates in the Pima County WIC program is a priority. Methods: A paper survey was administered to participants in the Pima County WIC program who had breastfed their youngest child under 12 months of age. Results: The most frequent reported influence on the decision to breastfeed was family. Likewise, support of family or friends was the highest reported facilitator to breastfeeding continuation. The most important reason indicated for breastfeeding was infant health. The greatest barrier to breastfeeding continuation was concerns of low milk supply, followed by returning to work or school. Conclusion: The Pima County WIC program can build upon the ways they support breastfeeding by incorporating family in education efforts and identifying what will facilitate participants' breastfeeding goals and participants overcome barriers to breastfeeding.
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Jönsson, Jesper. "W3C Geolocation API ur ett utvecklarperspektiv." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4910.

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The goal of this thesis is to investigate the W3C Geolocation API from a developer’s perspective, focused on whether it makes development of location-based applications more accessible to developers. This has been investigated by looking at available ways to locate, possible uses, the functionality offered, the necessary level of prior knowledge needed for a developer and requirements on developer tools. This has been achieved through studies in relevant areas, a thorough introduction to W3C Geolocation API functionality, and by using the API to develop two different location-based applications as a demonstration. Testing of applications, on different platforms and in different environments, in conjunction with investigation of the rest of the material has shown that W3C Geolocation API in many ways actually makes development of location-based applications more accessible for developers. The API also provides fully adequate functionality and quality to meet the requirements for development of both simple and very advanced location-based applications. Målet med denna uppsats är att undersöka W3C Geolocation API ur ett utvecklarperspektiv, fokuserat på om den gör utveckling av positionsbaserade applikationer mer tillgänglig för utvecklare. Detta har undersökts genom att titta på vilka positioneringstekniker som är tillgängliga, vilka användningsområden som är möjliga, vilka funktioner som erbjuds och vilka krav som ställs på utvecklaren i form av kunskap och utvecklingsverktyg. Detta har åstadkommits genom studier på relevanta områden, en genomgående introducering av vad W3C Geolocation API har att erbjuda för funktioner, samt användning av API:n i form av två egenutvecklade applikationer. Tester av applikationerna, på olika plattformar och i olika miljöer, har sedan tillsammans med utredning av resten av materialet visat på att W3C Geolocation API på många sätt gör utveckling av positionsbaserade applikationer mer tillgänglig för utvecklare samt erbjuder fullt tillräcklig funktionalitet och kvalitet för att tillgodose de krav som ställs för önskvärda användningsområden.
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Huang, Yuan. "Workload control (WLC) : success in practice." Thesis, Lancaster University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.578264.

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Workload Control (WLC) is one of few Production Planning & Control (PPC) solutions appropriate for Make- To-Order (MTO) companies and Small & Medium sized Enterprises (SMEs), yet its successful implementation remains an enduring challenge. Much research attention has focused on developing the concept in a theoretical or simulation context; relatively little has focused on implementing the concept in practice, and more empirical evidence is needed on successful implementations. Of the few successful WLC implementations which have been published previously, the focus has been on the result of implementation while the process of implementation itself is still a 'black box'. Where more detail on the implementation process has been given in previous studies, evidence of effectiveness in practice has not been provided. To address this research gap, this thesis presents a successful implementation of a comprehensive WLC approach through action research; this is the first study which demonstrates the impact of WLC on performance in practice alongside a detailed account of the implementation process. Performance improvements observed include: reduced lead times; improvements in lateness and tardiness; reduced costs; improved internal and external co-ordination; and higher quality. In addition to details of this successful implementation, a wider body of evidence on the characteristics of MTO SMEs that affect WLC implementation has been obtained through a survey of 41 companies using semi-structured face-to-face interviews. This compensates for the limitation of a single case and adds an element of generality to the research findings. Thus, a generalised set of WLC specific implementation issues and an implementation strategy for the widespread adoption of WLC in practice has been developed.
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Franco, Alexandre Luís. "Análise do padrão W3C / XForms 1.0." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2004. http://hdl.handle.net/10183/3722.

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Internet. Desde a versão 2.0 do HTML, entretanto, pouco foi melhorado no modelo de formulários proposto. Ao mesmo tempo, as necessidades dos desenvolvedores e os requisitos dos usuários cresceram dramaticamente. O W3C apontou uma resposta para as necessidades levantadas, o padrão XForms. O padrão XForms visa substituir o modelo de formulários definido no HTML por um modelo que separa o propósito da apresentação, adicionando, desta forma, a característica de independência de plataforma. A proposta deste trabalho é analisar o padrão XForms em relação à utilização de formulários HTML tradicionais, e à outras soluções existentes para automação de formulários na Internet, utilizando para isto uma aplicação piloto que procure utilizar alguns dos principais recursos disponíveis no padrão. Os pontos fortes, pontos fracos, dificuldades e lições aprendidas capturadas durante o desenvolvimento da aplicação piloto formam uma base de conhecimento apresentada neste trabalho.
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30

Torstenfelt, Alexander. "Experimental analysis and evaluation of WaveTubes WEC during tank test at Aalborg University, Denmark." Thesis, Uppsala universitet, Elektricitetslära, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-228130.

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This master thesis is the result after two weeks of persistent effort in a wave basin in Aalborg, Denmark, and later analysis in Uppsala. The client was a start-up wave energy company called WaveTube from Gothenburg. The assignment was to verify their newly built prototype with their mathematical model and with the result advise, give suggestions for improvements to a new prototype. In Aalborg a program called Wavelab were used to simulate the different wave states, when all data were collected, the data were analysed in MATLAB. The results shows that the prototype can deliver an output around 40kW in a significant wave height of 3.25 m, this can be compared with the theoretical model which resulted in a output about 150kw. Suggestions for improvement are given, and also specific areas that would require more research. Although the experimental result did not reach the theoretical, the experiments deemed successful since the main task was proof of concept. WaveTube has been selected for additional tests through the EU project Marinet, that will take place during the fall of 2014.
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31

Hassmund, David. "WSC Wind Science Centre : Centret för vindenergi." Thesis, Mittuniversitetet, Avdelningen för industridesign, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-20246.

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Målet med projektet har varit att designa en byggnad där information om vindkraft kan presenteras. Utgångspunkten iprojektet har varit upplevelsen med ett antal studier som grund. Området som berörs är Borgsjö som är optimalt läge fördenna typ av informationsbyggnad. Genom studiebesök, enkätundersökning, intervjuer och analys har ett antal konceptframställts. För att engagera besökarna så har även en enhet för utomhusbruk tagits fram där användaren med sin egenstyrka kan generera elektricitet och jämföra med miniverket. Slutkonceptet är en sluten byggnad med en interaktiv projektionoch statisk informatoin med interaktiva möjligheter på motsatt sida. Pekskärmar visade dig vara ett föredraget interaktionsmediumtillsammans med projektorn, alternativet pekskärm har dock valts bort i slutkonceptet till fördel för denstatiska lösningen.
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Bussa, Naga Raju. "WVU - interactive web based distance learning tool." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=1116.

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Thesis (M.S.)--West Virginia University, 1999.
Title from document title page. Document formatted into pages; contains v, 245 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 114-115).
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Santana, Suzi Helena de. "Revisão taxonômica das secções Heteranthae Krapov. & W.C. Greg. e Triseminatae Krapov. & W.C. Greg. do gênero Arachis L. (Fabaceae)." reponame:Repositório Institucional da UnB, 2013. http://repositorio.unb.br/handle/10482/13270.

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Dissertação (mestrado)—Universidade de Brasília, Instituto de Ciências Biológicas, Departamento de Botânica, Programa de Pós-Graduação em Botânica, 2013.
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Com 80 espécies, Arachis é dividido em nove secções taxonômicas. Duas, Heteranthae, com seis espécies anuais do Nordeste do Brasil, Minas Gerais, Goiás e Tocantins, e Triseminatae, com uma espécie perene de Minas Gerais, Bahia e Pernambuco, são aqui tratadas. Espécies destas secções mostram potencial forrageiro e adaptações estratégicas para sobrevivência em solos pobres e sob seca periódica. Suas plântulas têm caracteres exclusivos para a família e úteis para a distinção das espécies. A análise de tipos e de informação da literatura indicou que a morfologia dos acessos listados sob A. sylvestris não corresponde à descrição original e ao material tipo deste táxon, exigindo sua descrição sob nova espécie. Concluiu-se que o tipo de A. sylvestris corresponde ao nome anterior A. pusilla e foi designado um tipo para a espécie distinta indevidamente identificada como A. sylvestris, e elaborada sua descrição formal. Devido à alta variação encontrada a campo, à publicação de novas espécies, à descoberta de novos caracteres diagnósticos e a dúvidas sobre a circunscrição de alguns táxons, foi necessário elaborar novas chaves para distinguir as espécies e complementar suas descrições. A morfologia de cada espécie e das respectivas plântulas foi analisada em detalhes, para elaboração de chaves para plântulas e plantas adultas. O estudo taxonômico e morfológico foi baseado na análise de tipos e exemplares adicionais disponíveis em herbários brasileiros (CEN, CGMS, EAC, HUEFS, MOSS, UFRN) e de outros países (P, K). Novas coletas foram realizadas em distintos ecossistemas do Nordeste e de Minas Gerais. Foram observadas populações a campo e plantas individuais cultivadas ex situ no Banco Ativo de Germoplasma de Espécies Silvestres de Arachis da Embrapa Recursos Genéticos e Biotecnologia, com análise de cinco plântulas de cada acesso. O número de populações estudadas variou entre espécies, de uma a 27. Foram aplicados 23 descritores morfológicos para plântulas e 58 para plantas adultas. A ausência de cerdas em certas plantas é citada por primeira vez para A. giacomettii. Foi confirmada a concaulescência das gemas cotiledonares em todas as populações de A. pusilla e A. seridoënsis. Arachis pusilla mostrou a maior variação no estudo morfológico de plantas adultas. O maior número de espécies com endemismo potencial, e extremos morfológicos de outras espécies, foi encontrado no norte de Minas Gerais e sul da Bahia. As chaves, descrições e pranchas ilustrativas englobam sete espécies nativas, endêmicas do Brasil. ______________________________________________________________________________ ABSTRACT
With 80 species, Arachis has nine taxonomic sections. Two of them, Heteranthae, with six annual species from the Brazilian Northeast, Minas Gerais, Goiás and Tocantins states, and Triseminatae, with a perennial species from Pernambuco, Bahia and Minas Gerais, are treated here. Species of these sections show forage potential and strategic adaptations to thrive in poor soils, and under periodic drought. Their seedlings have features that are exclusive in the family and useful for distinction of species. Analysis of type materials and literature information lead to the conclusion that the accessions filed under A. sylvestris do not correspond to the original description and to the holotype of this taxon, requiring the description of a new species. In fact, the type of A. sylvestris corresponds to the previous name A. pusilla. So, a type has been designated for the distinct species incorrectely identified as A. sylvestris and its formal description was prepared. Due to morphological variation found in nature, to the publication of new species, to the finding of new characters, and to doubts on the circumscription of some taxa, providing new analytical keys and complementing descriptions became necessary. Morphology of each species and respective seedlings was analysed in detail, to prepare dichotomous keys for seedlings and adult plants, with expanded descriptions. The taxonomic and morphological study was based on the analysis of types and additional specimens available in Brazilian (CEN, CGMS, EAC, HUEFS, MOSS, UFRN) and foreign herbaria (P, K). New field collections were conducted over distinct ecosystems of the Northeast Region and Minas Gerais State. Field populations were observed, as well as individual plants cultivated ex situ in the Wild Arachis Genebank of Embrapa Recursos Genéticos e Biotecnologia, analyzing five seedlings/accession. The number of populations studied varied between species (1-27). Twenty three morphological descriptors were applied to seedlings and 58 to adult plants. Absence of bristles in some plants is cited for first time for A. giacomettii. Concaulescence of buds of cotyledonary branches was confirmed in all populations of A. pusilla and A. seridoënsis. In the morphological study of adult plants, A. pusilla has been the most variable species. The greatest number of potentially endemic species, and morphological extremes of other species, has been found in northern Minas Gerais and southern Bahia states. The keys, descriptions and illustrative plates cover seven native species, endemic to Brazil.
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34

OLIVEIRA, Hugo Santos. "CSVValidation: uma ferramenta para validação de arquivos CSV a partir de metadados." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/18413.

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Modelos de dados tabulares têm sido amplamente utilizados para a publicação de dados na Web, devido a sua simplicidade de representação e facilidade de manipulação. Entretanto, nem sempre os dados são dispostos em arquivos tabulares de maneira adequada, o que pode causar dificuldades no momento do processamento dos dados. Dessa forma, o consórcio W3C tem trabalhado em uma proposta de especificação padrão para representação de dados em formatos tabulares. Neste contexto, este trabalho tem como objetivo geral propor uma solução para o problema de validação de arquivos de Dados Tabulares. Estes arquivos, são representados no formato CSV e descritos por metadados, os quais são representados em JSON e definidos de acordo com a especificação proposta pelo W3C. A principal contribuição deste trabalho foi a definição do processo de validação de arquivos de dados tabulares e dos algoritmos necessários para a execução desse processo, além da implementação de um protótipo que tem por objetivo realizar a validação dos dados tabulares, conforme especificado pelo W3C. Outra importante contribuição foi a realização de experimentos com fontes de dados disponíveis na Web, com o objetivo de avaliar a abordagem proposta neste trabalho.
Tabular data models have been used a lot for publishing data on the Web because of its simplicity of representation and easy manipulation. However, in some cases the data are not disposed in tabular files appropriately, which can cause data processing problems. Thus, the W3C proposed a standard specification for representing data in tabular format. In this context this work has as main objective to propose a solution to the problem of validating tabular data files, represented in CSV, files and described by metadata represented as JSON files and described, according to the specification proposed by the W3C. The main contribution of this work is the definition of a tabular data file validation process and algorithms necessary for the implementation of this process as well as the implementation of a prototype that aimed to validate tabular data as specified by the W3C. Other important contribution is the execution of experiments with data sources available on the Web with the objective to evaluate the approach proposed in this work.
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Kahl, Melissa. "Structural Design of Hollow Extruded WPC Sheet Piling." Fogler Library, University of Maine, 2006. http://www.library.umaine.edu/theses/pdf/KahlMX2006.pdf.

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36

Ahmed, Lubna. "Working memory capacity (WMC) and visual attention efficiency." Thesis, Goldsmiths College (University of London), 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517893.

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Individual differences in WMC predict performance on everyday cognitive tasks, and measures of general intelligence (e.g. Conway, Kane, & Engle, 2003). Previous attempts to identify WMC-related differences on more specific functions that may contribute to the differential abilities between high and low WMC individuals have been mostly restricted to executive attention tasks (e.g. Kane et aI., 2007). Although external cognitive load, and exogenous orienting events, have both been reported to influence higher order functions (such as selective attention; Lavie et aI., 2004, and memory encoding; Schmidt and Vogel, 2002), the potential differential effects of these factors on high and low WMC individuals have not been addressed previously. In Section 1 of the thesis the interactive effects of external WM load and WMC on visual selective attention efficiency were investigated in the Navon and Flanker tasks; a reliable interactive effect of these factors on task performance was observed. The pattern of results implies that limitations in cognitive resources (either due to individual differences or external load) affect the ability to effectively constrain attention to relevant information. In Section 2, WMC-related differences in exogenous orienting were investigated using the ANT, Posner cueing task, and Gap paradigm. A reliable difference in high and low WMC individuals' orienting response was recorded in these tasks, but arguably only when the bottom-up exogenous orienting response was amenable to enhancement via top-down influences. Collectively the work has advanced understanding of WMC-related variations in visual attention processes; the findings from Section 1 not only document WMC-related differences in visual selective attention but also provide a mechanistic explanation for the variation, whilst the Section 2 findings revealed a WMC-related variation in utilisation of top-down on bottom-up effects during exogenous attentional orienting. The results have connotations for current theories of WMC and visual selective attention, which are discussed accordingly.
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37

Estrada, Lindsay. "WIC Participant Fruit and Vegetable Intake in California." Thesis, Walden University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10828829.

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Low-income populations in the United States consume less healthful diets than higher-income populations, specifically relating to fruit and vegetable consumption. The supplemental nutrition program Women, Infants, and Children (WIC) is intended to bridge this gap by providing nutrition education and vouchers for nutritious foods. The purpose of this study was to determine if the 2009 WIC food package revisions impacted fruit and green vegetable consumption in 18 to 24-year-old females in California. Using the social ecological model as a guide, a population of WIC (N = 115) and non-WIC (N = 276) participants from the California Behavioral Risk Factor Surveillance System survey were analyzed for trends on daily fruit and green vegetable consumption over the period of years 2009, 2011, 2013, and 2015. ANCOVA analysis showed that WIC and non-WIC populations did not consume significantly different amounts of green vegetables, but did consume significantly different amounts of fruits, p = .120 and p = .028 respectively. Additionally, WIC participant fruit consumption did not significantly increase over the years, p = .376. However, a decrease of .031 (95% CI [.019, .584], p = .037) was identified in green vegetable consumption between 2009 and 2015. Due to mean differences between samples and years it is evident that there are influencing factors driving fruit and vegetable consumption outside of income barriers, such as possible social or environmental factors. This study adds to the literature regarding the WIC food package revisions and may promote positive social change by encouraging future researchers to identify barriers to healthful diets in WIC populations and determine if additional food package revisions may be needed to increase healthful diets in low-income populations.

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38

Dias, Guilherme Antunes Alves. "Conformidade W3C de produtos/aplicações na Web portuguesa." Master's thesis, Universidade de Évora, 2010. http://hdl.handle.net/10174/20747.

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Nos dias que correm, a Internet tornou-se um dos principais meios de armazenamento e obtenção de informação. Contudo, esta informação necessita ser apresentada correctamente de forma a ser facilmente acedida por todos os utilizadores. Assim, é necessário que a construção de websites se apoie em normas e requisitos essenciais para que o nível correcto de acessibilidade seja garantido. Com esse intuito, foram propostas pelo W3C, várias de directrizes de acessibilidade que auxiliam a implementação de websites tendo como objectivo tornar a informação presente na Internet acessível a todos. A problemática da falta de acessibilidade torna­ se ainda maior em websites de utilização pública. Em Portugal, a legislação obriga os websites governamentais ou de serviços públicos a respeitarem o nível de conformidade A ou AA, conforme as directrizes propostas pelo W3C. O principal objectivo da presente dissertação é o de verificar o nível de acessibilidade em que se encontram os websites da administração pública nacional. Para a concretização do objectivo referido, procedeu-se à avaliação de acessibilidade e funcionalidade de diversos websites da função pública, utilizando ferramentas automáticas e manuais propostas pelo W3C e pela UMIC -Agência para a Sociedade do Conhecimento. ABSTRACT: ln the present days, the Internet has become a major way to store and retrieve information. However, this information needs to be displayed correctly in order to be easily accessed by all users. lt is therefore necessary that the construction of websites be based on standards to guarantee good accessibility. With this goal, W3C proposed a number of accessibility guidelines that assist the implementation of websites with correct accessibility to everyone. The lack of accessibility is even more important on websites for public use. ln Portugal, legislation requires government and public service websites to comply with the conformance level A or AA, according to the W3C accessibility guidelines. The main objective of the present work is to demonstrate the level of accessibility in the Portuguese public service websites. To achieve this objective, we performed accessibility and functionality tests on different websites, using automated and manual tools proposed by W3C and UMIC.
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39

Womble, Faydra V. "Thinking and Thobbing: Using Archival Research in WAC." Miami University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=miami1354240927.

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Bolzenius, Sandra M. "The 1945 Black Wac Strike at Ft. Devens." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1385398294.

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41

Trenkler, Silja. "Kampen fortsätter : En studie om kompatibilitetsproblem mellan moderna webbläsare." Thesis, Karlstad University, Faculty of Economic Sciences, Communication and IT, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-481.

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Under 1990-talet utspelade sig en bitter kamp om marknadsandelar mellan de två ledande webbläsare Internet Explorer och Netscape Navigator, det så kallade webbläsar-kriget. Kriget hade till följd att webbläsarna blev nästan helt inkompatibla. Sedan dess pågår en ständig utveckling av gemensamma standarder för webben. Idag är förutsättningarna för kompatibilitet mycket bättre än för tio år sidan, men problemet är inte fullständigt avhjälpt. De moderna webbläsare Internet Explorer 6, Firefox 1.5, Opera 8.5 och Safari kan återge en och samma webbsida visas på olika sätt trots att det finns gemensamma standarder. Syftet med denna uppsats är att ta reda på de tekniska orsakerna bakom problemet samt att ta fram lösningsförslag för att skapa en webbsida som är helt kompatibel i de moderna webbläsarna. Uppsatsen innehåller ett omfattande teorikapitel som behandlar definitioner, historik och problem. Teorin kompletteras av tre fältintervjuer med professionella webbutvecklare. Undersökningarna visar att kompati-bilitetsproblem beror på flera faktorer och att det är omöjligt att skapa en heltäckande lösning som kommer åt alla problem. Men genom att kombinera olika tekniker kan man skapa en metod som täcker en stor del av såväl generella som specifika kompatibilitetsproblemen utan att kollidera med rekommenderade standarder.


During the 1990’s the two leading web browsers, Internet Explorer and Netscape Navigator, fought each other in a battle for market shares, the so-called browser war. This war caused almost complete incompatibility between the web browsers. Since then, there has been a continual development of common standards for the web. Today conditions for compatibility are a lot better compared to ten years ago, but the problem is not completely solved. The modern web browsers Internet Explorer 6, Firefox 1.5, Opera 8.5 and Safari can display the exact same web page differently despite common standards. The aim of this essay is to investigate the technical causes of the problem and to develop suggested solutions for creating a web page that is fully compatible in modern browsers. The essay contains an extensive literature study, considering definitions, history and problems. The theory was completed with three field interviews with professional web designers. The investigations show that compatibility problems depend on several factors and that it is impossible to create one exhaustive solution that encompasses all problems. However, by combining different techniques one can create a method that covers a large part of both general and specific compatibility problems without colliding with recommended standards.

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42

D'Agostino, Sara Lynn. "An examinaton of celebratory violence WVU football season 2004 /." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4266.

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Compton, Christopher S. "Propagation of Alfvén waves in the WVU HELIX device." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4525.

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Thesis (M.S.)--West Virginia University, 2006.
Title from document title page. Document formatted into pages; contains iv, 22 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 22).
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44

Reed, Dustin Tyler. "KENTUCKY WIC PARTICIPANTS’ KNOWLEDGE, ATTITUDES, AND BELIEFS REGARDING GRAINS." UKnowledge, 2012. http://uknowledge.uky.edu/foodsci_etds/4.

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Obesity, diabetes, cardiovascular disease, and poor dietary habits are major healthcare problems in the United States. These issues are especially prevalent in the state of Kentucky and among at-risk populations such as Women, Infants, and Children (WIC) participants. Studies have found that whole grains play a role in weight maintenance, protection against type 2 diabetes, and lowering cholesterol. Interventions aimed at improving WIC participant dietary behavior and intake has been successful as well. This study assessed Kentucky WIC participants’ knowledge of the benefits of consuming grains, attitudes and beliefs regarding food purchasing and grains, and identified grains consumed in a two-week period. A survey, created with the input of Registered Dietitians and WIC staff, examined these factors. Results from the survey found that WIC participants might benefit from education on: purchasing nutrient-dense foods (especially whole grains), the nutrition facts panel, types of grains, nutrients such as calories, fat, sugar, and fiber, serving sizes, and how to get children to eat whole grains.
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45

Shawa, Willie Chiputu. "An ontology for information system development methodologies / W.C. Shawa." Thesis, North-West University, 2009. http://hdl.handle.net/10394/4914.

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As more organisations are expanding in their operations, there has been a strong emphasis on investing in Information Systems (IS). To ensure successful deployment of IS, software developers are advised to apply Information Systems Development Methodologies (ISDMs). The ISDMs provide a systematic approach to development of IS and ensure efficient use of resources during the development process. The stakeholders conducting the software development usually face problems communicating Systems Development (SD) terminologies. The software developers inconsistently use the SD terminologies during software development. Recently a new concept called ontology has been gaining a lot of popularity in Artificial Intelligence (AI), Computational Lingnistics and Database theory. Ontology'S potential is being realized in its ability to capture knowledge into a knowledge-base that could be shared with people within a particular domain area. This study aims at helping the software developers in understanding the different types of terminologies applied when conducting software development. The main objective is to develop an ontology for Information Systems Development Methodologies. The ontology will be used to mediate the meaning ofterminologies of SD. In cases where the development of software is undertaken through outsourcing, the software developers located in different countries can use a similar ontology in order to minimise the misunderstanding in the application of systems development terminologies during the development process. To determine the terminologies to use in the development of the ontology, a qualitative research approach was used. The research is regarded qualitative, as the information gathered for this research will not be expressed in numbers. The research paradigm employed in this research in interpretive in nature. To gather the data, both primary and secondary data collection strategies were employed. Data was gathered through document review and it was coupled with interviews conducted on a software development practitioner and three academics. After the data was collected, it was analyzed using the agreed upon terminologies. The ontology was then developed using a software package called Protege. The study found that software developers still have a misunderstanding on the use of SD terminologies. By developing an ontology for Information Systems Development Methodologies, the software developers can use the ontology to mediate the meaning of the SD terminologies that would minimize the misunderstanding of systems development terminologies when conducting software development.
Thesis (M.Sc. (Computer Science))--North-West University, Potchefstroom Campus, 2010.
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46

Banks, K. "Optimisation of bidrectional impulse turbines for wve power generation." Thesis, Cranfield University, 2009. http://dspace.lib.cranfield.ac.uk/handle/1826/10691.

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The generation of electricity from ocean waves using oscillating water column (OWC) wave energy converters is currently uneconomic due to the high capital cost and low efficiencies of such devices. The bidirectional air turbines utilised in OWCS are one of the principal sources of inefficiency and a significant increase in their performance would improve the prospects of commercial scale wave power generation. The ability of computational fluid dynamics (CFD) to predict the performance of both Wells and impulse type bidirectional turbines for use in OWCS was examined by comparison with experimental results taken from the literature. A design process was then undertaken for a datum impulse turbine and a novel high-efficiency impulse turbine arrangement. Numerical performance predictions are presented with a comparison against experimental data from a large-scale oscillating-flow test rig. An automated design and aerodynamic optimisation system was subsequently developed for application to this novel impulse turbine design. The optimiser employs a hybridised genetic algorithm along with Kriging meta¬models to significantly decrease the number of expensive calls to the 3D-CFD code used to evaluate the objective function. Comparisons to a number of state of the art optimisation algorithms from the literature on some mathematical test functions indicated that the optimiser had equivalent or better performance for most problems. A parameter study was carried out to investigate the effect of various turbine in design variables, before undertaking a 14-variable global design optimisation. A 5-variable optimisation exercise was then performed to investigate the effi- ciency gains that could be achieved by using three-dimensional rotor blades. Substantial gains in performance were attained and the predicted levels of efficiency are significantly higher than those previously reported in the literature for other bidirectional impulse turbine designs.
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47

Sadou, Amel. "Cross-talk between ral and rac pathways in the control of cell migration." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA11T010.

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Le mode de coordination parmi les différentes molécules qui régulent la migration reste très peu connu. Ce travail traite de deux voies de transduction régulant la migration: la voie Rac1/WRC (Wave Regulatory Complex) qui contrôle la formation du réseau d’actine au front des cellules migrantes, et la voie RalB/exocyst, dont les mécanismes moléculaires de son implication dans la motilité cellulaire étaient inconnus au début de cette thèse. Rac1 et RalB sont des petites protéines G des familles Rho et Ras, respectivement. Les complexes WRC et exocyst sont leurs effecteurs directs.Au cours de la recherche de connexions entre l’exocyst et des régulateurs de la migration, nous avons trouvé que deux sous-unités de l’exocyst, Exo70 et Sec6, interagissent directement in vitro avec Abi et Cyfip, respectivement, deux sous unités du WRC. De plus, nous avons trouvé que les sous-unités de l’exocyst peuvent interagir in vitro avec le WRC entier. Nous avons également montré que ces deux complexes s’associent in vivo. Sur le plan fonctionnel, l’exocyst est requis pour le positionnement du complexe WRC au front des cellules migrantes. D’autre part, nous avons également trouvé que deux autres sous- unités de l’exocyst Sec8 et Exo84, interagissent avec SH3BP1 (une RhoGAP) en double hybride et en co-immunoprécipitation. SH3BP1 se localise au front des cellules migrantes, et cette localisation dépend de l’exocyst. De façon intéressante, in vivo, la voie RalB/exocyst/SH3BP1 cible spécifiquement Rac1, et non Cdc42. Grâce à plusieurs approches, nous concluons que SH3BP1 est requis pour inactiver Rac1 au front. Dans notre modèle nous proposons que RalB/exocyst règulerait la migration cellulaire en véhiculant au front de migration deux éléments majeurs de la signalisation de Rac1 : son complexe effecteur WRC, qui stimule la nucléation de filaments d’actine et son régulateur négatif SH3BP1, une GAP qui promeut l’inactivation et le cycle GDP/GTP de Rac1. En conclusion, ce travail fournit de nouvelles connexions moléculaires et fonctionnelles entre l’exocytose polarisée et la dynamique de l’actine au cours de la motilité cellulaire
Very little is known about the coordination and the integration among the different regulators of the motility process. This work deals with two migration-regulatory pathways: the Rac1/WRC (Wave Regulatory Complex) pathway that drives the formation of the actin polymerization network at the front of motile cells; and RalB/exocyst pathway for which the molecular mechanisms underlying its implication in cell motility were still largely unknown at the beginning of this thesis. Rac1 and RalB are small GTPases of the Rho and Ras family, respectively. WRC and exocyst complexes are their direct effectors.In searching for connections between the exocyst and migration regulators, we found that two subunits of the exocyst, Exo70 and Sec6, interact directly in vitro with two subunits of the WRC, Abi and Cyfip, respectively. Moreover, we found that exocyst subunits can interact in vitro with the whole fully-assembled WRC complex. We also showed that these two complexes associate in vivo. Functionally, the exocyst was required for WRC complex positioning at the front of migrating cells.On the other hand, we also found that two other subunits of the exocyst, Sec8 and Exo84, interact with SH3BP1 (a RhoGAP protein) by two-hybrid assay and by co-immunoprecipitation. SH3BP1 localizes at the leading edge and this localization is dependent on the exocyst. Interestingly, in vivo, the RalB/exocyst/SH3BP1 pathway specifically targets Rac1, and not Cdc42. By a combination of approaches we concluded that SH3BP1 is required to inactivate Rac1 at the front.In our model we propose that RalB/exocyst regulates cell migration by driving to the leading edge two key signaling elements of the Rac1 pathway: its effector WRC, that stimulates actin filament nucleation, and its negative regulator SH3BP1, a GAP promoting Rac1 inactivation and GDP/GTP cycling. In conclusion, this work provides novel molecular and functional links between polarized exocytosis and actin dynamics during cell motility
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48

Askew, Jenny R. "Child Feeding Practices of WIC Participants in Gwinnett County, Georgia." Digital Archive @ GSU, 2011. http://digitalarchive.gsu.edu/nutrition_theses/15.

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Mothers of low socioeconomic status are less likely to breastfeed and more likely to formula feed. In addition, low socioeconomic status is associated with a premature introduction of cow’s milk, juice and solid foods. Negative outcomes such as asthma, diabetes and obesity later in life may result from improper child feeding practices. The aim of this study was to determine if WIC participants in Gwinnett County, Georgia are practicing child feeding recommendations set forth by the American Academy of Pediatrics (AAP) as well as following the Division of Responsibility in feeding developed by Ellyn Satter. Ninety-six WIC participants (92% mothers) primarily African American (39%) and Hispanic (35%) from Gwinnett County, Georgia were surveyed in March of 2011. Participants completed one of three surveys based on their method of feeding (breastfeeding, formula feeding or solid foods) after a nutrition education class. Compliance to feeding recommendations was determined among the entire survey population and by survey subgroups. Frequency distributions by method of feeding were calculated by age and race. Trends in feeding practices and the feeding environment were determined. Ten percent of participants surveyed reported breastfeeding, 22% reported formula feeding and 68% reported feeding solid foods. Participants who were not following AAP guidelines reported that they received advice primarily from health care professionals. Our results are consistent with previous research in that breastfeeding rates were low, the introduction of solids was early, and caregivers reported controlling feeding behaviors. Future research should focus on understanding the child feeding practices and beliefs of health care professionals.
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49

Martins, Vinicius. "Estudo das propriedades mecânicas dos compósitos WC-6Co, WC-10Co, WC-20Co, WC-6Co-6Ni, WC-6Co-12Ni obtidos por metalurgia do pó convencional para aplicação em anéis de selos mecânicos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/31381.

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O presente trabalho tem como objetivo o estudo das propriedades mecânicas do metal duro nas composições WC-6Co, WC-10Co, WC-20Co, WC-6Co-6Ni, WC-6Co-12Ni, obtidos por metalurgia do pó convencional para aplicação em anéis de selos mecânicos. Estes compósitos foram obtidos a partir de uma composição comercial de WC-6Co, e adicionado cobalto e níquel para realização do balanço de massa. Determinou-se um procedimento de obtenção das composições, através de cálculos de balanceamento adicionando-se a quantidade de cobalto e níquel necessária para transformar um compósito comercial 94WC-6Co nos metais duros mencionados. Após este procedimento adicionou-se 1,5% de lubrificante, em um misturador em “Y”. Analisou-se no Microscópio eletrônico de varredura a homogeneidade das composições. Determinou-se a densidade aparente, a curva de compressibilidade e compactaram-se as amostras de metal duro obtendo-se as densidades a verde. Realizou-se a pré-sinterização e determinaram-se as densidades das peças présinterizadas, executou-se ensaio de compressão e obtiveram-se parâmetros de usinagem na operação de faceamento e furação dos corpos de prova pré-sinterizados. A sinterização foi realizada em diversas vezes, nos dois fornos resistivos e em três atmosferas de controle diferentes. Determinaram-se curvas rápidas de sinterização e utilizou as temperaturas de 1360, 1400, 1420, e 1450ºC para as várias composições de metal duro. Para analisar-se a eficiência da mistura foi realizado ensaio de densidade das amostras sinterizadas, dureza, microdureza, metalografia, micrografia, EDS, contração linear e contração volumétrica e compressão. Após a caracterização dos materiais foi projetado e fabricado um ferramental de compactação. Compactou-se, sinterizou-se e retificou-se um anel de selo mecânico.
The aim of this work is to characterize to study the mechanical properties of carbide in the composition WC-6Co, WC-10Co, WC-20Co, WC-6Co-6Ni, WC-6Co-12Ni obtained by conventional powder metallurgy for application to rings of mechanical seals. These composites were obtained from a commercial composition of WC-6Co, and added cobalt and nickel to perform the mass balance. It was determined a procedure for obtaining the compositions, by calculation of balancing resulting in the amount of cobalt and nickel needed to transform a composite commercial 94WC-6Co in hard metals mentioned. After this procedure was added to 1.5% of lubricant, in a blender "Y". Analyzed in a scanning electron microscope the homogeneity of the compositions. It was determined the density, the compressibility curve and compress the samples carbide yielding green densities. We calculated the pre-sintering and determined the densities of pre-sintered parts, performed in compression test and it was obtained machining parameters in milling operation and drilling of the specimens pre-sintered. The sintering was performed at various times in the two resistive furnaces and atmospheres in three different control. Were determined fast corners and used sintering temperatures of 1360, 1400, 1420, and 1450 º C for various compositions of carbide. To analyze the efficiency of mixing was performed to test the samples sintered density, hardness, hardness, metallography, electron micrograph, EDS, linear and volumetric shrinkage and compression. After the characterization of materials was designed and manufactured tools of compaction, compacted, sintered and ground a ring of mechanical seal.
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50

Schubert, Christine, Sven Friedrich, Brit Clauß, Klaus Nendel, and Michael Gehde. "Grundlagenuntersuchung zum Heizelementschweißen von Wood Plastic Composite (WPC) Prozessparameter - Eigenschaftsbeziehung." Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-129724.

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Das Schweißen von WPC stellt zunächst aufgrund der thermoplastischen Matrix eine effektive Fügetechnologie dar. Der Beitrag behandelt das Heizelementschweißen von WPC und liefert Aussagen zur Wirkung der Prozessparameter auf die mechanischen und geometrischen Nahteigenschaften, dem Rezeptureinfluss und der thermischen Instabilität der Holzfaser. An den WPC-Rezepturen auf Basis von Polypropylen mit 40 Gew.-% und 50 Gew.-% Holzfasern sowie des Einsatzes von PET-Fasern im Compound, werden die Zusammenhänge untersucht und die Versagensmechanismen aufgezeigt.
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