To see the other types of publications on this topic, follow the link: Skimming.
Dissertations / Theses on the topic 'Skimming'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 44 dissertations / theses for your research on the topic 'Skimming.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Dvorak, Janice. "Skimming stones." Honors in the Major Thesis, University of Central Florida, 2001. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/219.
Full textAbstract:
This item is only available in print in the UCF Libraries. If this is your Honors Thesis, you can help us make it available online for use by researchers around the world by following the instructions on the distribution consent form at http://library.ucf.edu/Systems/DigitalInitiatives/DigitalCollections/InternetDistributionConsentAgreementForm.pdf You may also contact the project coordinator, Kerri Bottorff, at kerri.bottorff@ucf.edu for more information.Bachelors
Arts and Sciences
English
2
Ng, Ka Wing 1965. "Skimming of fluid slag." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33340.
Full textAbstract:
A 1/12 scale tank was constructed to physically simulate the metallurgical skimming process in order to gain a better insight of the skimming of fluid slag from copper anode furnaces. 1-decanol and water were used to represent the slag and the underlying liquid metal respectively. It was observed that slag skimming was comprised of two steps, a transportation step to carry slag to the skimming lip, and a removal step to move the slag across the lip. The efficiency of the transportation by bath surface circulation was strongly affected by the method of creation of the surface movement. Submerged gas injection failed to carry slag to the lip effectively because of the uncontrollable circulation pattern generated on the bath surface. On the other hand, three impinging gas jets in glancing contact with the bath surface were able to carry slag to the lip effectively. The Re of the jets (I.D. 0.01m) inclined 50° to the horizontal was 6100. The jet configuration was two of the jets were placed close and parallel to the rear wall of the model and faced each other. The third jet was parallel to the model short axis and was directed at the skimming mouth. With the same amount of time, 70% of the slag originally charged to the tank was skimmed with the assistance from the impinging gas jets in comparison to 20% when no jet was used. Detailed analysis of the skimming process revealed that the underlying liquid bath level continuously decreased as the slag was skimmed and resulted in continuous reduction of the skimming rate. In order to compensate the reduction of skimming rate due to bath level reduction, a control strategy was proposed for rotating the furnace continuously to maximize the skimming effectively.
3
Arons, Barry Michael. "Interactively skimming recorded speech." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/29072.
Full text
4
Jones, Campbell Llyr. "Neural control of a sea skimming missile." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387900.
Full text
5
Grill, Peter, and Fredrik Linde. "Oil Skimming : Business Potential and Strategic Options Facing a Marginalised Business Segment at Sandvik Process Systems." Thesis, KTH, Energiteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-127660.
Full textAbstract:
The purpose of this thesis is to study the oil skimming market and evaluate what drives company competitiveness and market attractiveness. Throughout the thesis, the total oil skimming market has been divided into an industrial market and an offshore market as these applications have entirely different requirements. However, the skimming market in general is underdeveloped and the long lifetime of the equipment has a negative impact on the market development speed. It is therefore characterised by a fragmented body of competitors and diverging pricing. Instead of price being an order-winning aspect, recovery rate and ability to pick up a large variety of oils has been found to be important. In this inductive, and interpretivistic case study, a model for market analysis of an underdeveloped market is developed and applied to Sandvik Process Systems’ oil skimming business. The study is based on an extensive interview program with oil skimming equipment manufacturers, and oil spill response companies. The model comprises of an external, and an internal analysis synthesised into a SWOT-matrix from which five strategic directions are extracted. These directions are described as well as their respective business impact on Sandvik Process Systems. Sandvik Process Systems’ skimmer is a steel belt skimmer developed in the 1960’s. With a lifting height of up to three metres and a width of up to 400 mm, the Sandvik oil skimmer is capable of lifting 354 litres per hour in optimal conditions. Compared to its competitors, the skimmer is a low cost alternative priced at 66-75% below industry average. However, the results of the analysis indicate a poor competitiveness of Sandvik Process Systems’ product. Due to an inferior technology, Sandvik Process Systems’ skimmer lacks the capacity needed to target the offshore market. Therefore, the product can only target the industrial market. Meanwhile, many competitors offer complete solution packages including as pumps, storage tanks, and a variety of specialised skimmers in order to increase their competitiveness. Looking at the competitors it is clear that Sandvik Process Systems’ skimmer does have advantages. However, many of the advantages are based on organisational strengths which are difficult to leverage. Also, the organisation does not have any experience from the oil skimming market and due to the small size of the market, it is doubtful if Sandvik Process Systems are able to devote the necessary resources to overcome this hurdle. Due to a revenue target set at EUR 2.33 million, Sandvik Process System’s skimmer would require a 23.9% of the market value or 119% of the number of skimmers sold. Despite this thesis reaching the conclusion that Sandvik Process Systems should not enter the oil skimming market; it also stipulates that Sandvik Process Systems does have the potential to successfully sell skimmers. However, reaching the goal of EUR 2.33 million is deemed unlikely.
6
Rodgers, John Martyn Henry. "Demythologising skimming : the operationalisation, teaching and practice of skimming in a second language with special reference to the IELTS test." Thesis, University College London (University of London), 2009. http://discovery.ucl.ac.uk/10019882/.
Full textAbstract:
Despite its prominence, especially in academic reading, skimming is much under researched with very few research papers devoted to it, of which only two are L2- related. Such research as there is suggests that skimming is most likely to be effective when the text is predictable, familiar and simple (in terms of content, structure, language or any combination of these). This study considers skimming within an L2 context (specifically, skimming for the IELTS test). In particular, it investigates the specific characteristics of skimming. In addition, it considers the relationship between skim reading texts with familiar and unfamiliar content. The pedagogy-focused enquiry consists of an analysis of the way 14 textbooks cover skimming and a further analysis of 92 questionnaire responses from IELTS teachers. The learner-focused enquiry analyses 16 verbal protocols, collected from participants who had read texts with familiar and unfamiliar content. The textbooks examined implied that skimming is extremely useful for IELTS candidates, though there was no unanimity about the speed of skimming or its operationalisation. Similarly, the teachers surveyed almost unanimously endorsed the value of skimming for test-takers but varied greatly in their methods of teaching and even in their understanding of the extent to which it can be taught. Analysis of the verbal protocols revealed a number of strategies that were used by skim readers, a comparison with Anderson's (1991) list of strategies for normal reading indicating the particular emphasis of skim readers on time-saving and gist-yielding strategies. Comparison of quantitative data showed no major differences in scores between skimming texts of familiar and unfamiliar content, although the participants' perception of difference, with the text with unfamiliar content being perceived as far more difficult, was acute. It was concluded that there is a continuum from normal reading to skimming: thus skimming is a variant of normal reading and not a separate process from it.
7
Andrade, Olavo Amorim de. "Sensitivity and robustness analysis for sea-skimming missile." Thesis, Monterey, California: U.S. Naval Postgraduate School, 1986. http://hdl.handle.net/10945/22093.
Full text
8
Spadaro, Martin J. "DIFFERENTIAL GPS APPLICATION FOR SEA-SKIMMING AERIAL TARGETS." International Foundation for Telemetering, 1997. http://hdl.handle.net/10150/609794.
Full textAbstract:
International Telemetering Conference Proceedings / October 27-30, 1997 / Riviera Hotel and Convention Center, Las Vegas, NevadaLow cost, commercial off-the-shelf Global Positioning System (GPS) receivers can be used to provide real-time track of ground launched subsonic, sea-skimming missile targets when integrated with existing telemetry equipment and commercial radio modems. GPS reference stations can be deployed that are capable of generating, broadcasting and monitoring Differential GPS corrections that effectively eliminate the deliberate position errors imposed by the Department of Defense. Commercial GPS receivers are effective and provide contiguous position data even during the boost phase of flight when G forces exceed the receiver manufacturer’s published specifications.
9
Jeong, Yu Seon, Minh Vu Luu, Mary Hall Reno, and Ina Sarcevic. "Tau energy loss and ultrahigh energy skimming tau neutrinos." AMER PHYSICAL SOC, 2017. http://hdl.handle.net/10150/625525.
Full textAbstract:
We consider propagation of high-energy earth-skimming taus produced in interactions of astrophysical tau neutrinos. For astrophysical tau neutrinos, we take generic power-law flux, E-2 and the cosmogenic flux initiated by the protons. We calculate tau energy loss in several approaches, such as dipole models and the phenomenological approach in which parametrization of the F-2 is used. We evaluate the tau neutrino charged-current cross section using the same approaches for consistency. We find that uncertainty in the neutrino cross section and in the tau energy loss partially compensate giving very small theoretical uncertainty in the emerging tau flux for distances ranging from 2 to 100 km and for the energy range between 10(6) and 10(11) GeV, focusing on energies above 10(8) GeV. When we consider uncertainties in the neutrino cross section, inelasticity in neutrino interactions and the tau energy loss, which are not correlated, i.e. they are not all calculated in the same approach, theoretical uncertainty ranges from about 30% and 60% at 10(8) GeV to about factors of 3.3 and 3.8 at 10(11) GeV for the E-2 flux and the cosmogenic flux, respectively, for the distance of 10 km rock. The spread in predictions significantly increases for much larger distances, e.g., similar to 1, 000 km. Most of the uncertainty comes from the treatment of photonuclear interactions of the tau in transit through large distances. We also consider Monte Carlo calculation of the tau propagation and we find that the result for the emerging tau flux is in agreement with the result obtained using analytic approach. Our results are relevant to several experiments that are looking for skimming astrophysical taus, such as the Pierre Auger Observatory, HAWC and Ashra. We evaluate the aperture for the Auger and discuss briefly application to the other two experiments.
10
Chamani, Mohammad Reza. "Skimming flow in a large model of a stepped spillway." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq22963.pdf.
Full text
11
Luu, Minh Vu. "Earth skimming tau neutrino propagation: structure function parametrization and dipole model." Diss., University of Iowa, 2017. https://ir.uiowa.edu/etd/5805.
Full textAbstract:
We consider the high energy Earth skimming tau neutrinos converting to taus following by tau propagation through rock. The difficulty in predict the final tau flux comes from the theoretical uncertainties in the tau electromagnetic energy loss and the neutrino-nucleon cross section. The first part of the thesis focuses on deriving the dipole cross section from a theoretical parametrization of the electromagnetic structure function, then uses said cross section to compute the tau's energy loss at high energies during Earth propagation. We find the extracted dipole cross section agrees well with other derivation and dipole models. In the second part, we use different approaches to the structure function $F_2$ and the dipole model to evaluate the corresponding energy loss and cross section. We keep consistent the same approach through both calculations of energy loss and neutrino cross section, and find the emerging tau fluxes match well. We also present the results from our Monte Carlo simulation and our analytic evaluation, and we find that they are in agreement. Finally, we briefly discuss the relevence to several experiments that are looking for skimming astrophysical taus, such as the Pierre Auger Observatory, HAWC, and ASHRA. As a quick demonstration, we show our approximation of the aperture at the Pierre Auger using the energy losses and cross sections calculated from the considered approaches.
12
Kirkland, Lynn. "THE INFLUENCE OF THE SCHOOL CHOICE PROVISION, WITHIN THE NO CHILD LEFT BEHIND LEGISLATION, ON THE ACADEMIC ACHIEVEMENT OF STUDEN." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3783.
Full textAbstract:
The No Child Left Behind (NCLB) Act of 2001, Public Law 107-110 (U.S. Congress), was passed by Congress in response to perceived failure of the public school system to effectively educate students, particularly disadvantaged students in the United States. The relationship of NCLB school choice to student achievement has not been clearly established. This causal-comparative study examined the following: (a) FCAT mathematics and reading achievement gains of targeted fourth through eighth grade NCLB choice students and a comparison group of eligible non-choosers with matching demographic characteristics; (b) the pre-test academic ability levels of NCLB choice students in fourth grade through eighth grade as compared with the achievement levels of eligible non-choosers, and; (c) differences in the ethnic and socioeconomic characteristics of choice students versus eligible non-choosers in kindergarten through eighth grade, and the impact of those differences on the demographic composition of individual schools. Differences in the achievement gains and in the pre-test achievement levels of NCLB choice students and the comparison groups were not statistically significant. NCLB choice students tended to have different ethnic and socioeconomic characteristics from their non-choosing peers. The effect of NCLB choice on Title I students and schools was discussed, and NCLB choice implementation issues were identified.Ed.D.
Department of Educational Research, Technology and Leadership
Education
Educational Leadership EdD
13
Pérez, Carranza Silvia Roxana. "Aplicación de la estrategia del Scaffolding para el desarrollo de capacidades de comprensión lectora en los alumnos del 4to ciclo del Centro de Idiomas de la URP." Master's thesis, Universidad Ricardo Palma, 2016. http://cybertesis.urp.edu.pe/handle/urp/1240.
Full textAbstract:
El objetivo principal de esta investigación fue analizar el resultado de tres técnicas muy utilizadas en la estrategia del scaffolding. Para llevarla a cabo, se trabajó durante un semestre con el curso de Inglés 4 del Centro de Idiomas de la URP, nivel intermedio. Para lograr esto, se desarrollaron lecciones y actividades planificadas a través de la enseñanza de las técnicas del skimming, scanning y subrayado, cuyo propósito fue el de mejorar las habilidades de comprensión lectora de los estudiantes de dicho curso.
El enfoque de la investigación fue cuantitativo, de nivel explicativo y de tipo aplicada, seleccionándose el diseño experimental de clase cuasiexperimental. Se utilizó como técnica de recojo de información la encuesta y como instrumento se aplicó una prueba al grupo de control, antes y después de la aplicación de las técnicas. Luego se analizaron las puntuaciones para ver los logros de la aplicación.
Los resultados confirmaron la hipótesis general al encontrarse diferencias significativas en el grupo de control debido a la aplicación de las técnicas; es decir, se logró desarrollar una mejor comprensión de los textos leídos.
14
Husain, Sarhang Mustafa. "Computational investigation of skimming flow on stepped spillways using the smoothed particle hydrodynamics method." Thesis, Swansea University, 2013. https://cronfa.swan.ac.uk/Record/cronfa43038.
Full text
15
Gizeli, Electra. "New acoustic wave sensor geometries." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282004.
Full text
16
Lindberg, Joakim, and Jon Emil Horntvedt. "Privatisering av sjukförsäkringarna: Rätt väg att gå? : En utvärdering av effekterna arbetsgivarinträdet 1992 och medfinansieringsansvaret 2005 haft på sjukfrånvaron." Thesis, Uppsala University, Department of Economics, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6362.
Full textAbstract:
Vi har studerat arbetsgivarinträdets (1992) och medfinansieringsansvarets (2005) påverkan på
sjukfrånvaron i Sverige. För att göra detta har vi använt oss av sjukfrånvarostatistik från
Svenskt Näringsliv ”Tidsanvändningsstatistik” vilket är genomsnittstal baserat på ungefär
210 000 arbetstagare. På detta material har vi skattat regressionsmodeller för kort och lång
sjukfrånvaro samt med och utan arbetslöshet, som är tänkt att fungera som indikator för
konjunkturläget, vilken i Sverige tycks påverka sjukskrivningstalen. Vi får fram att
arbetsgivarinträdet verkar ha minskat de korta sjukskrivningarna samtidigt som arbetslösheten
i samtliga fall är en signifikant förklarande del i sjukfrånvaron. Vi ser å andra sidan tecken på
att arbetsgivarinträdet 1992 kan ha förlängt frånvarotiden hos de långtidssjukskrivna.
Medfinansieringsansvaret tycks ha minskat sjukskrivningarna på både kort- och
långtidsfrånvaron.
17
Šmat, Jakub. "Organizovaný zločin." Master's thesis, Česká zemědělská univerzita v Praze, 2016. http://www.nusl.cz/ntk/nusl-260236.
Full textAbstract:
This study characterizes one of the most serious forms of organized crime in the Czech Republic, namely counterfeiting of means of payment, focusing on the issue of credit card fraud and skimming. It deals with various types of credit cards, legal and technical aspects of their protection, and economic aspects in terms of damage incurred and liability of caused damage. The thesis evaluates the risk of skimming in the Czech Republic, describes various methods of attack, and provides advice and recommendations related to the defence against this illegal activity.
18
Eriksson, Susanne, and Johan Krussgård. "Nyckelfaktorer vid utformande av vårdvalsmodeller : En fallstudie av vårdval i Sverige." Thesis, Linköpings universitet, Företagsekonomi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-62258.
Full textAbstract:
Bakgrund Den 1 januari 2010 började lagen om valfrihetssystem tillämpas inom primärvården i Sverige och det innebär att samtliga landsting ska ha infört vårdval, ett system där medborgare får välja vilken vårdenhet de vill vända sig till. Det är en av de senaste reformerna som har skett inom den svenska sjukvården och ett aktuellt ämne som har bidragit till diskussioner. Förespråkare menar att valfrihet är en självklar rättighet, medan kritiker hävdar att patienter är för dåligt informerade eller för sjuka för att kunna fatta rationella beslut. Det kan vårdgivare utnyttja genom att överbehandla patienterna. Vidare anser de att systemet endast bidrar till ökade kostnader. Syfte Syftet är att utvärdera hur vårdvalsmodeller har fungerat inom primärvården för att identifiera nyckelfaktorer som landstingen kan ta hänsyn till för att utveckla sina modeller. Genomförande Uppsatsen är en fallstudie av vårdval som har genomförts med hjälp av teorier, tidigare studier och intervjuer med insatta personer i fyra landsting, landstinget Halland, landstinget i Östergötland, landstinget Västmanland samt Stockholm läns landsting. Resultat Viktiga faktorer som har identifierats för ett fungerande vårdval är valmöjlighet, information samt ett väl utformat ersättningssystem som minskar risken för selektering, s.k. cream-skimming. Det finns skillnader mellan vårdvalen, framförallt i de ersättningssystem som de har valt att tillämpa. Det har även visat sig att det inte finns en optimal modell som fungerar för samtliga landsting utan de måste ta hänsyn till sina unika förutsättningar och vilken målsättning de har för förändringen av primärvården.
19
Savostyanova, Natalia, and Valeriya Velichko. "Plastic card frauds, a survey of current relevant card and system properties." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2424.
Full textAbstract:
Recently the society has been turning from the use of paper-based technologies to plastic cards in certain spheres of our life. With the emergence and proliferation of high technologies we cannot content with the security provided bypaper only. Therefore the society has chosen plastic to protect its information because it offers far more security based not only on human perception but also on machine-readable elements.
The number of plastic cards in circulation in different spheres of our everyday life increases constantly. They replace money, documents and allow easy and safe access to some services. In spite of its security the plastic card however is subjected to fraud.
Plastic card fraud results in significant losses for the various industries. Since the first appearance of plastic cards methods of committing fraud have changed dramatically. Now there is a wide range of high technologies at the disposal of criminals as well as card manufacturers.
Therefore we have put the great emphasize of this work on the analysis of the most common card technologies in the Plastic Card World, the magnetic stripe and the chip, existing crimes and main means of their committing. And we also have revealed the weak and strong sides of the prevention techniques, which are currently in use.
20
Selander, Jonas. "RFID-teknikens sårbarheter i kort med beröringsfri funktion." Thesis, Högskolan i Gävle, Avdelningen för elektronik, matematik och naturvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-27546.
Full textAbstract:
Radio Frequency Identification (RFID) används i många områden idag. Det finns olika typer av sårbarhet och hot mot RFID-system där bland annat skimning av bankomatkort är ett hot. Skimning är bankomatkortsbedrägeri genom att stjäla känsliga kortuppgifter som senare kan användas i brottsligt syfte. På grund av hot för skimning, har olika RFID-skydd dykt upp på marknaden, så kallade skimningsskydd som är designade att placeras i plånboken för att skydda korten mot avläsning. I examensarbetet har olika skimningsskydd testats, där resultatet blev att de var skillnad mellan dem. Det dyrare skyddet skyddade flera kort samtidigt medan det billigare alternativet endast kunde skydda ett kort samtidigt. Efter resultatet var slutsatsen att skimningsskydden inte var tillräckligt effektiva för att skydda alla korten i en plånbok. För att ge bästa skydd bör placeras längst ut på varje sida i plånboken. Många telefoner har en inbyggd RFID-standard vid namn Near Field Communication (NFC), som gör det möjligt att scanna beröringsfria bankomatkort med inbyggd RFID-krets. I det här examensarbetet har olika beröringsfria kort lästs av med hjälp av en telefon med inbyggd NFC-teknik med härför avsedda applikationer. Både kortnummer och utgångsdatum gick att läsa av, dock inte CVC-koden. Slutsats efter detta experiment var att det är svårt att skimma en annan persons kort med hjälp av en telefon med inbyggd NFC-teknik. Telefonen måste vara i direktkontakt med kortet för att kunna läsas av, däremot kan en RFID-läsare med lång räckvidd skimma från längre avstånd. Två olika RFID-läsare har testats, där den ena läsaren hade en inbyggd antenn men till den andra läsaren har en extern antenn designats och kopplats in. Syftet var att mäta läsavståndet mellan tagg och RFID-läsare. Läsavståndet varierade på grund av antennens egenskaper.
21
Martillo, Santander Fermin Eduardo. "El “skimming y scanning” como estrategia para la comprensión lectora de textos en inglés en estudiantes del 1º nivel, Centro de Idiomas - Dirección de Educación Continua, Universidad Técnica de Machala, Ecuador - 2017." Doctoral thesis, Universidad Nacional Mayor de San Marcos, 2019. https://hdl.handle.net/20.500.12672/17434.
Full textAbstract:
La intención de la investigación fue demostrar la influencia de la técnica “skimming”
y “scanning” como estrategia para la comprensión de textos en inglés de los
estudiantes del 1° nivel del centro de idiomas de la Dirección de Educación
Continua, Universidad Técnica de Machala, Ecuador-2017. La hipótesis planteada
fue: la técnica “Skimming” y “scanning” influyen de manera significativa en la
comprensión de textos en inglés de los estudiantes. El tipo de investigación fue
aplicada, el método utilizado en la investigación fue el método científico y de diseño
cuasi experimental, de nivel explicativo. Para ello se trabajó paralelamente con dos
grupos de estudio. El grupo de control conformado por 13 estudiantes y el grupo
experimental conformado por 13 estudiantes del 1° nivel del centro de idiomas; Se
elaborò un pre test y un post test con lecturas seleccionadas del idioma inglès, que
fueron aplicados en el primer y ultimo momento de la investigación, luego de todo
el semestre académico.
Se aplicó dos instumentos, test de comprensión lectora utilizando la técnica
“Skimming” y el otro test comprensión lectora utilizando la técnica “Scanning” en
textos redactados en inglès. Para la técnica de recolección de datos fue la
evaluación con su instrumento respectivo la lista de cotejo, con la validez de
expertos y confiabilidad del alfa de Cronbach. La hipótesis fue comprobada
utilizando el estadístico de la T de Student, mediante el programa SPSS versión 24.
En las conclusiones se demostró que, las técnicas de “skimming” y “scanning”
influyen de manera significativa en la comprensión de textos en inglés de los
estudiantes del 1° nivel del centro de idiomas de la Dirección de Educación
Continua, Universidad técnica de Machala, con 5% de margen de error, con P-valor
= 0 menor al 0,05 de significancia. La media aritmética en el Post Test para el grupo
control fue de 36.31 y para el grupo experimental obtuvo el 39.83, con una
diferencia significativa para ambas variables.
22
Lagergren, Tobias. "Design och implementering av en datorsäkerhetsdatabas – samt en behovsanalys därav." Thesis, Linköpings universitet, Institutionen för systemteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-60113.
Full textAbstract:
Denna rapport beskriver de behov vilka ligger tillgrund för att skapa en IT-säkerhetsdatabas. Rapporten tar även upp olika IT-säkerhetsproblem och för en diskussion om vad som är faran med dessa problem. Diskussionen förs inom två områden rörande IT-säkerhet.Det ena området är om IT-säkerhet i allmänhet och tar upp begreppet CIA. CIA står för de engelska begreppen Confidentiality, Integrity och Availability och på svenska, sekretess, integritet och tillgänglighet.Den andra delen handlar om lite mer specifika IT-säkerhetsproblem, som till exempel virus och sniffing.På uppdrag av FOI är en databas, vilken är avsedd för att lagra information rörande IT-säkerhet, skapad. Rapporten tar upp en del grundläggande databasteori och beskriver designen och implementationen av databasen. Även hur databasen fungerar beskrivs.Slutligen förs en diskussion om uppnådda resultat och om möjlig framtida utveckling av databasen.This report describes the needs which are the basis for creating an IT security database.The report also discusses various IT security issues and a discussion of what are the dangers of these problems. The discussion conducted in two areas relating to IT security.The first part is about IT security in general and addresses the concept of the CIA. CIA stands for the English concepts of Confidentiality, Integrity and Availability. The terms in Swedish are sekretess, integritet and tillgänglighet.The second part deals with some more specific IT security problems, such as viruses and sniffing.On behalf of FOI a database is created, which is designed to store information relating to IT security. It outlines some basic database theory and describes the design and implementation of the database. Also the functions in the database are described.Finally a discussion over the results achieved and the possible future development of database is carried out.
23
Nóbrega, Juliana Dorn. "Escoamento deslizante sobre turbilhões em descarregadores em degraus de largura constante e convergentes, usando o método Hidrodinâmica Suavizada de Partículas." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-18032019-162340/.
Full textAbstract:
O método Hidrodinâmica Suavizada de Partículas (em inglês: Smoothed Particle Hydrodynamics - SPH) foi utilizado para o desenvolvimento de um estudo numérico envolvendo descarregadores lisos e descarregadores em degraus (considerando escoamento deslizante sobre turbilhões), com paredes laterais paralelas e paredes convergentes, usando o software DualSPHysics. Muitas vezes é conveniente utilizar a construção de descarregadores com maior largura na crista, e menor largura do descarregador, para adaptação das limitações físicas locais. O estreitamento do descarregador de forma gradual até atingir a largura da seção de jusante é feito por meio de paredes laterais convergentes, que por sua vez induzem à formação de ondas estacionárias laterais, e consequentemente aumento da altura do escoamento junto às paredes. Existem poucos estudos na literatura sobre esse tema, justificando o estudo numérico desenvolvido neste trabalho. O modelo numérico foi desenvolvido com base em um modelo físico do Laboratório de Hidráulica e Recursos Hídricos do Instituto Superior Técnico, Portugal, sendo os resultados experimentais obtidos em estudos anteriores. A instalação experimental é composta por um descarregador com declividade de fundo de 26,6º, e ângulo das paredes de 0º; 9,9º e 19,3º em relação ao plano vertical. As simulações foram realizadas em duas ou três dimensões, conforme a condição de largura constante ou convergente. Os resultados foram comparados com dados experimentais em termos de alturas do escoamento na parede e no eixo do descarregador, perfis de velocidade na região não-aerada do escoamento, e largura da onda estacionária lateral. Para as simulações tridimensionais, também foram elaborados gráficos de isolinhas para a altura do escoamento, podendo-se observar a extensão das ondas estacionárias laterais conforme a condição de superfície lisa ou em degraus, e a elevação de água junto às paredes. Em geral, houve boa aproximação entre dados numéricos e experimentais, verificando-se a aplicabilidade do método SPH para simular o escoamento deslizante sobre turbilhões em estruturas em degraus, ou estruturas convencionais de paramento liso.A numerical study using the Smoothed Particle Hydrodynamics method (SPH) was developed for smooth and stepped spillways (for skimming flow regime), with converging and non-converging sidewalls, using the software DualSPHysics. In numerous situations, it is convenient to built spillways with longer width at the crest and narrower width at the downstream end of the spillway, depending on the site constrains. The gradual narrowing of the spillway width is usually made through converging sidewalls, which induce the formation of shockwaves, leading to higher flow depths along the sidewalls. Few studies in the literature were carried out in this research topic to date, justifying the numerical study developed in this project. The numerical model was based on a physical model assembled at the Hydraulic and Water Resources Laboratory of the Instituto Superior Técnico, Portugal, using experimental data obtained in previous studies. The experimental setup was composed by a spillway with slope of 26.6º, and angles of converging sidewalls of 0º, 9.9º, and 19.3º in relation to the vertical plane. Two-dimensional or three-dimensional simulations were carried out according to the condition of constant width or converging walls. The results were compared with experimental data, related to the flow depths at the centerline and sidewall of the spillway, the velocity profiles on the non-aerated region, and the lateral standing wave width. Regarding the three-dimensional simulations, contours of the flow depth were also represented, to visualize the extent and height of the sidewall shockwaves, according to the smoothed or stepped face. In general, a good agreement was obtained between numerical and experimental results, which confirms the ability of the SHP method to simulate the skimming flow over stepped spillways, or the flow on more conventional, smooth spillway chutes.
24
Lalangui, Villalta Nelli Elizabet. "Uso de las estrategias metodológicas “Skimming y Scanning” en la comprensión de textos escritos de los estudiantes de VII módulo de la carrera del Idioma Inglés de la Universidad Nacional de Loja – Ecuador durante el año lectivo 2013 – 2014." Master's thesis, Universidad Nacional Mayor de San Marcos, 2015. https://hdl.handle.net/20.500.12672/8916.
Full textAbstract:
El documento digital no refiere asesorPublicación a texto completo no autorizada por el autor
Manifiesta la influencia que producen las técnicas skimming y scanning en la comprensión de textos escritos. En la investigación se emplea el método científico como guía general y el método experimental como guía específica, con un diseño cuasi-experimental. La muestra está conformada por 60 alumnos. Los instrumentos de recolección son de inventario de las estrategias de lectura “skimming y scanning” en la comprensión de textos escritos. Los instrumentos recibieron la adecuada validación, mediante estudio de jueces, para la validez y un estudio piloto para obtener la confiabilidad.
Tesis
25
Šulc, Vladimír. "Stategie firmy pro elektronický obchod - platební karty." Doctoral thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2009. http://www.nusl.cz/ntk/nusl-233726.
Full textAbstract:
This dissertation work deals with the subject of a company in the area of e-commerce, which represents short-term or long-term plans in controlling the financial relationship toward the outer environment but also inside the company. The problem of possible abuse of credit cards is briefly analysed as well. The impulse for choosing this topic was increasing number of falsification and abusing of credit cards. When this subject is analysed in detail, the problem connected with lack of information on this particular area of crime inevitably appears. Clients of individual banking institutions often do not have even the basic knowledge about the ways their cards could be abused or misused. This is why the question of certain, at least minimal, basic information campaign done by the banks, which are supposed to protect the financial means of their clients. This dissertation work sets its goal in creating the methods of investigation of credit cards abuse not only in the Czech Republic but in the growing system of countries of Schengen Treaty and European Union. The benefit of the work can be seen in the level of theory as well of practice. The theoretical part of the work contains the analysis of the current situation of scientific knowledge in the area of information and communication technology of companies, which is implemented into information systems. Then the advantages and disadvantages connected with this kind of e-commerce are assessed and the specific opportunities for abuse of these media of payment are characterised. The problem sees mainly in writing a specialised publication, which would deal with the problem of abuse and falsification of credit cards and its possible use would be at police academies. Its main part should be the characteristics of particular forms of cards forging and also possible identification of these forgeries. This book could also help in prevention and inform clients of financial institutions about the ways of credit cards abuse. In the practical part, which concentrates on the Czech and foreign market, the author sets the basic premises for realisation of safe business of companies in the Czech Republic and its procedures. Furthermore the reasons of e-commerce abuse in the Czech Republic are analysed and results of quantification research presented. This was concentrated on ascertainment of reason of low interest in information among the public. In the conclusive part of the work the whole problem is summarised and there are also outlined perspectives and possibilities of further development
26
Ocampo-Garcia, Jorge Ricardo. "Cottage Cheese from Ultrafiltered Skimmilk by Direct Acidification." DigitalCommons@USU, 1987. https://digitalcommons.usu.edu/etd/5344.
Full textAbstract:
Pasteurized skimmilk at 4°C was acidified to pH 5.8 with 85.5% phosphoric acid (136g H3Po4;100 kg skimmilk), then warmed to 54°C and ultrafiltered to a protein concentration 9.1 ± 0.2%. The retentate was heated to 76.5°C for 16 s then cooled to 2°C. Phosphoric acid (85.5%) was added at a rate of 3.41g per kg retentate. The acidified retentate was slowly warmed to 29.5 °C (3°C/5 min) when the pH was checked. The pH at this point was no lower than 5.4. Heating was continued until a temperature of 32.2°C was reached. Glucono delta lactone was added to the retentate (17.6 g/kg retentate) and left undisturbed for approximately 80 min. The curd was cut at pH 4.7 with 0.64 cm curd knives and allowed 10 min for syneresis. Permeate obtained from the same lot of milk was acidified to pH 4.8 (66 g H3Po4;100 kg permeate), then added to the curd at 32.2°C (three parts permeate to four parts retentate) and used as a cooking vehicle. The curd was cooked to 59°C in 90 min. The curd was held at 59°C for 10 min, drained and washed once with ice water. Cream dressing containing 12.5% fat and 3% salt was used at the rate of two parts curd to one part dressing.
Control cottage cheese was produced by a direct acid method from the same skimmilk used to produce ultrafiltered curd.
Use of ultrafiltered skimmilk retentate for cottage cheese making resulted in 2.24% more curd (corrected to 20% solids) and 2.24% more curd per kg original milk protein than the control. However, satisfactory firmness in UF curd required slightly more than 20% solids in the final product. Sensory evaluations indicated that creamed cottage cheese was not significantly different (p
27
Guibu, Pereira Gabriel. "Modélisation numérique d'écoulements turbulents avec entraînement d'air au sein d'ouvrages hydrauliques." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAD023.
Full textAbstract:
La dispersion de l'air dans l'eau est un phénomène observé fréquemment pour une large variété , d'écoulements dans des structures hydrauliques, qu'elles soient naturelles ou conçues par l'homme. Or, la présence de bulles d'air immergées dans l'eau modifie de façon significative les caractéristiques de l'écoulement. Ces modifications peuvent être bénéfiques ou nuisibles selon la situation. En particulier, dans le contexte des milieux confinés des réseaux d'eaux urbains, l'évaluation du transport d'air est un facteur important pour le dimensionnement des ouvrages, tels que les puits de chute. Le travail présenté dans cette thèse s'intéresse à l'identification et au développement des techniques de modélisation numérique tridimensionnelle, permettant de mieux évaluer les interactions eau-air et le transport diphasique dans le contexte des ouvrages hydrauliques. Une approche de modélisation diphasique hybride est implémentée, dans le but de représenter les écoulements à la fois en régime ségrégué et dispersé. Différentes méthodologies ont ainsi été appliquées pour simuler des écoulements aérés, et leurs résultats ont été confrontés à des mesures expérimentalesThe mixing and dispersion of air into water is a frequently observed feature of flows occurring in nature and in man-made hydraulic structures. The addition of immersed air bubbles in the water modifies substantially the flow's characteristics, which may have a desirable or harmful effect depending on the context. Furthermore, the assessment of the air currents is of value in the study of confined spaces. For instance, this is important in the design of air vents in structures such as dropshafts in sewage systems. This thesis focuses on identifying and developing three-dimensional computational models for a better description of air-water interactions and two-phase flows in the context of hydraulic structures. A hybrid two-phase modelling approach is implemented in this thesis, thus allowing the simultaneous representation of segregated and dispersed flow regimes. The results from different methods employed for the aerated flow simulations are finally confronted with experimental data
28
Tung, Rita Y. Y. "The Effect of Ultrafiltration on Protein Quality of Skimmilk and Cottage Cheese." DigitalCommons@USU, 1987. https://digitalcommons.usu.edu/etd/5346.
Full textAbstract:
Protein quality in freeze-dried skimmilk (SM), regular cottage cheese (RCC), retentate (Ret) and cottage cheese made from ultrafiltrated skimmilk (UFCC) were evaluated by chemical (amino acid score) and biological methods. Biological evaluation was at 5, 8 and 11% protein level in growing rats by measuring biological value (BV), net protein utilization (NPU) and nitrogen efficiency for growth (NEG) over a 14-day period. A 28-day protein efficiency ratio (PER) was determined on the same products at 10% protein level. Effects of added lactose on PER of retentate, regular and UFCC were also evaluated. The most limiting amino acids were cystine + methionine. Amino acid score for Animal Nutrition Research Council (ANRC) reference casein, SM, RCC, Ret and UFCC was 0.72, 0.91, 0.87, 0.91 and 0.98 respectively according to Food and Agricultural Organization/World Health Organization (FAO/WHO) pattern and 0.45, 0.56, 0.54, 0.57 and 0.61 respectively according to whole egg pattern. PER was 2.7, 3.0, 2.7, 3.1 and 2.8 for ANRC reference casein, SM, RCC, Ret and UFCC respectively. PER for retentate and skimmilk were significantly different from the cottage cheese. No significant difference in protein quality was obtained when the products were fed at 5, 8 and 11% levels. Average BV was 93, 91, 91, 95 and 94 for ANRC reference casein, SM, RCC, Ret and UFCC respectively. Average NPU was 87, 84, 83, 85 and 85 for ANRC reference casein, SM. RCC, Ret and UFCC respectively. Average NEG values were 66, 73, 70 77 and 73 for ANRC reference casein, SM, RCC, Ret and UFCC respectively. PER values were 2.7, 3.0, 2.7, 3.1 and 2.8 for ANRC reference casein, SM, RCC, Ret and UFCC respectively. Addition of lactose to a level equal to that in skimmilk reduced the PER value of RCC, Ret and UFCC by about 4%, 6% and 4% respectively. Though no significant difference in protein quality of the products were obtained, there was a tendency of ultrafiltration to increase protein quality.
29
Faria, Gerson de Souza. "Novos ataques de canal secundário a dispositivos de entrada manual de dados confidenciais." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-22032017-080657/.
Full textAbstract:
Esta tese apresenta três novos ataques a equipamentos de pagamento eletrônico que possuem teclado mecânico, conhecidos como \"PIN pads\". Mostramos de três formas distintas como tais equipamentos possuem vulnerabilidades de segurança na camada física que permitem o vazamento do PIN (Personal Identification Number) quando o mesmo é digitado. Demonstramos experimentalmente que é possível inferir com elevada taxa de acerto (100% em um dos ataques) a senha digitada, de forma não-invasiva. Os ataques desenvolvidos são baseados na introdução de sensores nos próprios equipamentos ou em seu ambiente de operação: acelerômetros para análise de vibração, microfones para análise acústica e células de carga para medição de forças do pressionamento. Devido à massificação no uso de sensores por dispositivos de consumo, o roubo de informação por meios não convencionais é atividade crescente. Os resultados dos ataques de baixo custo realizados expõem sérias deficiências no processo de certificação de segurança de tais equipamentos.This thesis presents three new attacks on electronic payment equipment having mechanical keypads, known as \"PIN pads\". We show in three different ways how they have security vulnerabilities at the physical layer allowing the leak of the PIN (Personal Identification Number) when it is entered. We experimentally demonstrated that it is possible to infer with high success rate (100% in one of the attacks) the password entered on the device, in a non-invasive way. The attacks are based on the placement of sensors inside the equipment itself or in its operating environment: accelerometers for doing vibration analysis, microphones for acoustic analysis and load cells for measuring the pressing force. Due to massive deployment of sensors in consumer devices, information theft by unconventional means is increasing. The results of the low-cost attacks here developed expose serious shortcomings in the process of security certification of such equipment.
30
Fukuda, Tomoko. "A systematic study of Skimmia japonica (Rutaceae) and its relatives with special reference to phytogeography." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136810.
Full text
31
Jiokap, Nono Yvette. "Étude de l'influence des paramètres hydrodynamiques et physico-chimiques sur l'efficacité de l'épuration bactérienne du lait par microfiltration tangentielle : modélisation des mécanismes de transfert." Vandoeuvre-les-Nancy, INPL, 1997. http://www.theses.fr/1997INPL008N.
Full textAbstract:
Nous présentons notre contribution à la modélisation du transfert de matière en microfiltration tangentielle du lait. Une étude bibliographique nous conduit à distinguer trois classes de modèles pour la microfiltration tangentielle : les modèles de transfert de solvant, les modèles de transfert de soluté et les modèles de transfert de solvant et de soluté. Les particularités de chaque classe de modèles sont dégagées, des comparaisons sont faites entre les différents modèles et des extensions et améliorations d'écritures sont proposées. Cette étude montre que la plupart des modèles développés pour la microfiltration tangentielle sont des modèles semi-empiriques. Pour atteindre notre objectif, une série d'expérimentations est réalisée sur deux membranes minérales de 1,4 micromètre de diamètre de pores. Diverses suspensions modèles de complexité croissante sont étudiées. La nature des divers constituants a été choisie de manière à se rapprocher du lait, tout en assurant l'obtention d'un fluide modèle simple. Comme le lait écrémé, la suspension modèle la plus complète contient des macromolécules, des particules et des sels. Elle présente également des propriétés physico-chimiques comparables à celles du lait. Les filtrations, menées dans une large gamme de conditions opératoires, montrent que les grandeurs de transfert de matière dépendent étroitement de l'environnement physico-chimique de la suspension traitée, de la morphologie des microorganismes, des conditions hydrodynamiques, du mode de fonctionnement du pilote, de la nature et de l'homogénéité de la membrane. Nous montrons que l'élimination des spores pendant la filtration n'est que partielle, indiquant que le produit microfiltré nécessite un traitement complémentaire pour lui conférer son innocuité. Deux modèles de transfert, dont les écritures de base traduisent le mieux les mécanismes mis en jeu pendant la microfiltration tangentielle, ont été retenus pour notre cas. Il s'agit du modèle d'érosion du gâteau et des modèles de la filtration frontale. Les originalités de nos écritures par rapport à celles de la littérature sont, d'une part, d'exprimer les paramètres du modèle en fonction des conditions hydrodynamiques. D’autre part, nous mettons en jeu, dans le modèle d'érosion, la contrainte de cisaillement à la position du module, plutôt que la vitesse tangentielle à l'entrée de celui-ci. Nous montrons que les paramètres de chaque modèle dépendent non seulement des conditions opératoires, mais également de la nature de la suspension traitée. Les résultats de simulation obtenus sont conformes à la plupart des observations de la littérature. Nous concluons notre travail en montrant que les deux modèles développés décrivent bien les cinétiques expérimentales de microfiltration tangentielle de différents laits écrémés.
32
Smith, Ryan Andrew. "Harvesting duckweed by skimming." 2003. http://www.lib.ncsu.edu/theses/available/etd-01272003-121357/unrestricted/etd.pdf.
Full text
33
Su, Chih-Wen, and 蘇志文. "Automated Digital Movie Skimming." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/77977887442306281658.
Full text
34
Mauldin, Michael L. "Information retrieval by text skimming." 1989. http://books.google.com/books?id=TwThAAAAMAAJ.
Full textAbstract:
Thesis (Ph. D.)--Carnegie Mellon University, 1989."August 28, 1989." "CMU-CS-89-193." eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references and indexes.
35
Yeh, ying-chen, and 葉映辰. "Skimming over the surface- Is fleeting." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/19282173135702651942.
Full text
36
Jhou, Shen-Hung, and 周伸鴻. "Study on the Characteristics of Skimming Flow." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/18525863124757223588.
Full textAbstract:
碩士國立中興大學
土木工程學系所
96
The characteristics of skimming flows over a vertical drop were investigated experimentally using visualization technique and high speed particle image velocimetry (HSPIV) system. The non-dimensional critical depth (Yc/H) ranges from 0.335 to 0.632. According to the result observed qualitatively by using visualization technique, the flow region can be divided to sliding jet and pool regions. The flow fields were measured and discussed for these two regions. First the study aims at sliding jet. According to digital image and water surface profile measured by point gauge, the curve of water surface can be determined by multi-variable regression. In order to measure the velocity of shear layer, curvilinear coordinate used instead of cartesian coordinate. The velocity profiles were measured from upstream to downstream. Based on the result, the shear layer thickness increases as the sliding jet moves downstream. Using the method proposed by Lin et al. (2008), the velocity profiles can be established by the center point of shear layer, Yrc, the specific width, bs, as length scale and the velocities of the upper and lower boundary of specific width Uu and Ud, as velocity scale., the similarity profile of shear layer was obtained as following:(略) The study also focuses on the characteristics of pool region. The shape of velocity profiles in the pool is similar to a wall jet. Different characteristic values were tested for velocity and length scales for similarity analysis. Finally, by selecting the maximum adverse velocity Um as velocity scale and half-width thickness b0 as length scale, similarity profile can be obtained in the form of:(略)
37
Iong, Chan-Hin, and 容震軒. "A monte-carlo study on earth-skimming tau neutrinos." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/29694598074497109016.
Full textAbstract:
碩士國立交通大學
物理研究所
92
We present our Monte-carlo simulation results on tau-lepton energy spectrum induced by the Earth-skimming tau neutrinos, taking into account the inelasticity of neutrino-nucleon scatterings and the tau-lepton energy loss in detail. We argue that the tau-lepton flux resulting from neutrino-nucleon scatterings inside the earth is controlled by the tau-lepton range, rather than the distance of tau-leptons/neutrinos traverse inside the Earth. We also comment on the energy-resolution of tau neutrinos in the earth-skimming detection strategy.
38
Lin, Wei-Jung, and 林蔚榮. "Flow Characteristics in Skimming Flow over a Vertical Drop Pool." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/62218054167115811436.
Full textAbstract:
博士國立中興大學
土木工程學系所
97
The characteristics of non-ventilation skimming flow over a vertical drop pool were investigated experimentally, using flow visualization technique and high speed particle image velocimetry (PIV). Five series of experiments having different end sill ratios [h/H = 0, 0.12, 0.43, 0.71 (referred as dropping flow case); and 1.0 (referred as cavity flow case), where h is the end sill height and H is the drop height] with various approaching flow discharges were performed to measure the detailed quantitative velocity fields. The mean velocity, vorticity, turbulence intensity, Reynolds shear stress and turbulent energy budget terms were obtained by ensemble averaging the repeated measurements. Flow characteristics were discussed from the full-field point of view, and from the local point of view which is focused in the shear layer region between sliding jet and pool as well as focused at the bottom boundary in pool region. In addition, energy loss was examined for non-ventilation skimming flow and compared with those for the ventilation dropping flow given by Rajaratnam and Chamani (1995). In the shear layer between sliding jet and pool, it is found that the growth of the shear layer in the downward direction as the jet slides down the pool represents the momentum exchange. Analyzing the distribution of measured velocity, the similarity profile of the mean velocity at different cross-sections along the shear layer was obtained. The proposed characteristic scales provided unique similarity profiles having promising regression coefficient. The selection of the characteristic scales is also discussed. In the magnitude of relative Reynolds number ranging from O[103] to O[104], the flow characteristics of mean velocity field should be Reynolds number independent in the shear layer region. Further, the spatial variations of mean velocity profiles, turbulence intensities, in-plane turbulent kinetic energy and Reynolds shear stress were also elucidated in detail. The imperative observation is that the Reynolds shear stress dominates the major part along the shear layer as compared to the viscous shear stress. The study also provides an insight into the energy budget balances at different cross-sections in the shear layer. Near the bottom boundary in pool region, similarity profile for the mean horizontal velocity was obtained, which showed the similar trend of velocity distribution of the plane turbulent wall jet. The distributions of turbulence intensity, Reynolds shear stress, and turbulent energy budget terms were also discussed for different X-sections on the bottom boundary in the pool. Furthermore, the study also discusses the energy budget balances at different X-sections on the bottom boundary in the pool.
39
Lai, I.-Chun, and 賴一儁. "Efficient Methods for Skimming the Web-based Synchronized Multimedia Lectures." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/17510614320253048945.
Full textAbstract:
碩士國立暨南國際大學
資訊工程學系
92
With the development of streaming technologies and e-learning platforms, more and more multimedia lectures integrating different media are accessible on the web. The massive multimedia lectures with huge and lengthy media decrease the learning efficiency. In this thesis, two access modes are provided to help users to search significant information in multimedia lectures rapidly. We apply the temporal relationship among multimedia to search information in different granularities, and detect the significant segments by the analysis of the intonation and navigation events of lecturers to offer the user an abridged version of a multimedia lecture. The integration of these two modes has been practically applied to Web-based Synchronization Multimedia Lecture system for facilitating the access and browse of multimedia lecture.
40
Khor, Tzee-Aong, and 許茨閎. "E-journal reading habits of graduate students: triage and skimming behavior." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/74531066799144045658.
Full textAbstract:
碩士國立臺灣大學
圖書資訊學研究所
101
This study investigated graduate student e-journal triage and skimming behaviors. We analyzed the content structures of journal articles from 3 disciplines to examine their effects on student behaviors. Fifteen graduate students from National Taiwan University were recruited to participate in the study, with 5 from the Department of Foreign Languages and Literatures, 5 from the Department of Sociology, and 5 from the Department of Chemistry. All students were working on their theses and were required to read a certain number of English journal articles. We assigned 2 tasks in this study: journal-article triage and skim reading. Students were requested to search English databases and choose 5 relevant articles that met their research needs. They then skimmed 1 of the 5 articles on the computer screen. Student behaviors were recorded using screen-image capture software. Time spent in triage, bibliographic elements observed, sections of an article skimmed, and time spent in skimming were collected. Students explained their triage and skimming behaviors in the follow-up interviews. The contents of all 75 articles saved by students during database searches were further analyzed based on the IMRD structure model. The results indicated that most students judged article relevance based on brief bibliographic information of the search results and the full text of the article. Certain variations existed among different disciplines, but the article titles (particularly those containing keywords that the searcher used) were the most mentioned bibliographic element on which students made initial judgments. When browsing an article, most students indicated the abstract as the key source in helping them judge document relevance. Most students spent less than 3 min in the judgment process. A few students reported that article length affected their triage behavior and their reading intention. When skimming an article, students reported first reading a few pages and considered the abstract a primary source in helping them judge relevancy in a short time. Students also mentioned that skimming helped them grasp the main concepts of an article and make a judgment of relevance. Content structures were found to differ among journals in the 3 disciplines. However, students agreed that an article with clear sections and headings was useful for their triage and skimming behavior. We found that journal-article layout affected student-reading speed and sense of comfort. Literature and sociology students preferred reading articles paged with only one column, whereas chemistry students preferred two-column articles. Certain students indicated that article layout also affected their triage behavior. Most databases rank retrieval results according to document relevance. E-journal databases may list documents containing keywords used by searchers in top retrieval results. Database results of different disciplines may require specific bibliographic information that is suitable for searchers of that discipline. Full-text linkage must also be explicitly marked. We found that not all journal articles included an abstract, particularly those in the literature field. We recommend presenting an abstract to help readers quickly catch the key concept of an article.
41
Yen, Ching-Ching, and 閻菁菁. "Numerical Simulation on the Characteristics of Skimming Flow over a Drop Pool." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/43987829682774017721.
Full textAbstract:
碩士國立中興大學
土木工程學系所
98
ABSTRACT The installation of a vertical drop pool in an open channel is aimed to dissipate the flow energy, which can diminish the destruction of the down-stream channel. Many previous experimental works have been conducted on the hydraulic properties of the flow over the drop pool. This paper tells that FLOW-3D solver, the numerical model based on coupling the RANS equation and the RNG turbulent transport equation, is presented to analyze the characteristics of the skimming flow over the drop pool. The simulated results presented in the paper are first verified according to previous results of flow visualization. The characteristics of flow fields, including velocity distributions, vorticity distributions, turbulent energy dissipations and pressure distributions etc. are then analyzed. The empirical formula of the energy loss between the approaching flow and the down-stream flow is also presented in this paper. The present simulations are conducted for a specified supercritical approaching flow on a fixed drop height H but different heights of the end sill h. As a result, the ratios h/H are ranging between 0 and 1. The fixed length of the drop pool is considered in the simulations. The simulated results show that an air pocket exists between the falling jet and pool if the ratios h/H are smaller than 2/14. The skimming flow will be formed in the cases of h/H ≧ 4/14 that the dropping flow slides over the pool and forms a sliding jet. The momentum exchange between the sliding jet and the pool formed the clockwise circulation flow in the pool. The maximum vorticity occurs at the impact zone near the end sill in the case of falling jet, but in the case of skimming flow, the maximum vorticity occurs at the drop corner where sliding jet starts. It is also found that the turbulent energy dissipations take mainly place between the sliding jet and the pool, or that perhaps the turbulent energy dissipations take place at the momentum exchange zone. The results of pressure distributions show that negative pressure occurs in the falling jet which air pocket exists. The pressure on the wall of the end sill is found to be pseudo hydrostatic distribution for larger h/H. As for the energy loss due to the vertical drop, it is found that the head loss decreases as the h/H increases. However, the supercritical flow with high Froude number exists in the down-stream, implying that much attention should be paid to the protection of bed scour.
42
SMRČKOVÁ, Radka. "Analýza trestné činnosti v bankovnictví." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-153501.
Full textAbstract:
-The thesis was focused on the analysis of damage and wear of coins and banknotes. And then there was analyzed the counterfeiting of the Czech banknotes and coins. All analyzed date were summarized in the tables and in the graphs. This analysis of the Czech crowns was compared with the same analysis of the euro bankonetes. The counterfeiting of money is not the only crime in the banking. The next possibility of the crime in the banking is the skimming of ATM (automatic teller machine). The one of parts of thesis was focused on it. There was performed the analysis of the number of cases of skimming in Czech Republic. This was compared with the analysis of the number of cases of skimming in European Union too.
43
Smith, Jarrod Gayden. "Producing fuel and specialty chemicals from the slow pyrolysis of poultry DAF skimmings." 2008. http://purl.galileo.usg.edu/uga%5Fetd/smith%5Fjarrod%5Fg%5F200805%5Fms.
Full text
44
Geldenhuys, Nicolaas D. C. "An evaluation of identification methods used in the investigation of counterfeit card fraud." Diss., 2016. http://hdl.handle.net/10500/21185.
Full textAbstract:
Today, the use of one's bank card to pay or withdraw money is common. Modern technology provides us with the convenience of instant transactions at the automated teller machine or point of sale but unfortunately, it has also brought the reality and risk of card skimming and counterfeit card fraud. Criminals have become very efficient and technologically advanced in skimming and counterfeiting cards, to such an extent that counterfeit card fraud has become a significant threat to the public, banking, retail and business in South Africa.
Counterfeit card fraud is a complex, multi-faceted crime, requiring specific skills and knowledge of card counterfeiting methods from police and bank investigators. The scope of its investigation is wide. It includes different crime scenes and offenders, sophisticated equipment and various aspects that need to be identified positively. Investigators find it difficult to identify perpetrators and certain aspects unique to this crime and, as a result, many investigations are unsuccessful. This research endeavours to establish what identification methods are available to investigators and which are effective.Police Practice
M. Tech. (Forensic Investigation)