Academic literature on the topic 'Collum angle'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Collum angle.'
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.
Journal articles on the topic "Collum angle"
1
Panezai, Saadia, Nasrullah Mengal, and Sadia Nisar Ahmed. "COLLUM’S ANGLE AND CROWN ROOT ANGLE OF MAXILLARY INCISORS IN DIFFERENT MALOCCLUSIONS." PAFMJ 71, no. 1 (February 24, 2021): 238–42. http://dx.doi.org/10.51253/pafmj.v71i1.4983.
Full textAbstract:
Objective: To determine Collum angle and crown to root angle of maxillary central incisor in different skeletalmalocclusion.
Study Design: Comparative cross sectional study.
Place and Duration of Study: Orthondontics department, Bolan Medical College, Civil Sandman Hospital,Quetta, from Jun to Dec 2018.
Methodology: Data sample consisted of 140 lateral cephalograms. Sample consisted of 74 female cephalograms and 66 male cephalograms. The mean age of sampled subjects ranged between 21.62 ± 5.96 years. The Colum angle of the maxillary central incisors in each group was measured. SPSS version 21 was used to enter and process data. Comparison between Class II division 1 and division 2 collum angles was made by applying student t-test.
Results: The average value for Collum angle in class II division 1 sample was 4.38 ± 3.08 with minimum being 0and maximum 15 degree. The average values for Class II division 2 was 10.52 ± 4.37 with minimum 30 and amaximum 23 degree.
Conclusion: Maxillary central incisors in all malocclusions had significantly different mean Collum angles fromzero. Paired sample t-test comparison showed that the Collum angle for maxillary central was much higher inClass II division 2.
2
Behroz, Erum, Hafiz Zuhair Ahmed, S. M. Tariq Rafi, Tabassum Ahsan Qadeer, Mairah Shah, and Samar Fatima. "Comparison of Collum Angle of Maxillary Central Incisor in High Angle and Low Angle Patients." Journal of the Pakistan Dental Association 30, no. 02 (May 27, 2021): 113–17. http://dx.doi.org/10.25301/jpda.302.113.
Full textAbstract:
OBJECTIVE: This study aims to determine the mean collum angle of maxillary central incisor and to compare it between high angle and low angle patients undergoing orthodontic treatment. METHODOLOGY: This cross-sectional, observational study was conducted using lateral cephalometric radiographs of 61 class II division 1 patients (comprised 32 males, 29 females, age range 13 to 30 years) from the record files of patients inducted for Orthodontic management from June 2020 till August 2020 at the Department of Orthodontics, Sindh Institute of Oral Health Science, Jinnah Sindh Medical University, Karachi, Pakistan. The sample was divided on the basis of Vertical Analysis (angulation of mandibular plane) into high and low angle cases. Collum angle was measured using the angulation of the Maxillary Central Incisor (MCI). Student t-test was used to compare the mean difference of the collum angle between skeletal vertical malocclusions. RESULTS: Mean value of the collum angle for high angle (Vertical Growth pattern) cases were mean ± standard deviation (4.35°±1.49°) while for low angle groups (Horizontal Growth pattern) were (2.41°±1.60°). CONCLUSION: There Collum angle of permanent maxillary central incisors differ significantly (p<0.001) among high angle and Low angle malocclusions cases (n=61) and showed pronounced axial bending in Class II division 1 incisors with high angle (4.35° ± 1.49°) as compared to low angle malocclusion (2.41° ± 1.60°). KEYWORDS: Collum Angle, Maxillary Central Incisor, Orthodontic Treatment, High Angle, Low Angle.
3
Gomaa, Nahla, Shaimaa Elmarhoumy, and Neveen Fakhry. "Maxillary Central Incisors’ collum angle in different skeletal vertical malocclusions – A Cephaometric study." Egyptian Dental Journal 65, no. 1 (January 1, 2019): 1–7. http://dx.doi.org/10.21608/edj.2019.71240.
Full text
4
HOFMANN, ULF-KRISTER, INGMAR IPACH, INA-CHRISTINE RONDAK, ROLAND SYHA, MARCO GÖTZE, and FALK MITTAG. "INFLUENCE OF AGE ON PARAMETERS FOR FEMOROACETABULAR IMPINGEMENT AND HIP DYSPLASIA IN X-RAYS." Acta Ortopédica Brasileira 25, no. 5 (October 2017): 197–201. http://dx.doi.org/10.1590/1413-785220172505173951.
Full textAbstract:
ABSTRACT Objective: While several radiographic parameters have been established to describe the geometry and pathology of the hip, their reference values and clinical significance remain a matter of dispute. The present study tests the hypothesis that age has a relevant impact on radiographic hip parameters. Method: Pelvic antero-posterior views were measured for CE angle, Sharp’s angle, acetabular depth-to-width ratio, femoral head extrusion index, roof obliquity, caput-collum-diaphyseal (CCD) angle, and Murray’s femoral head ratio, and the values obtained were correlated with age. Results: Significant weak and moderate linear correlations (all Ps<0.001) were observed between age and CE angle (ρ=0.31), Sharp’s angle (ρ=-0.38), extrusion index (ρ=-0.22), CCD angle (ρ=-0.15), depth-to-width ratio (ρ=-0.38), and roof obliquity (ρ=-0.19), while Murray’s femoral head ratio (ρ=0.05; P=0.274) was not associated with age. Interestingly, the parameters describing the acetabulum all showed a relevant increase in coverage with age, leading to CE-angles well beyond 40° and a Sharp’s angle below 35° in a large portion of asymptomatic older adults. Conclusion: While a decrease in CCD angle with age is described in most orthopedic textbooks, the changes observed with age in acetabular geometry far exceed those measured at the femoral head-neck junction. We recommend considering these alterations that may be attributable to age when formulating a radiographic diagnosis. Level of Evidence III, Diagnostic Studies - Investigating a Diagnostic Test.
5
Joshi, Harshil Naresh. "A Rare Case of Severely Acute Collum Angle in Orthodontic Practice – A Case Report." Bioscience Biotechnology Research Communications 14, no. 6 (June 15, 2021): 25–28. http://dx.doi.org/10.21786/bbrc/14.6.5.
Full text
6
Golubovic, Ivan, Zoran Bascarevic, Predrag Stojiljkovic, Zoran Radovanovic, Ivana Golubovic, Milan Radojkovic, Dusan Djordjevic, Aleksandar Mitic, Svetlana Milijic, and Zoran Golubovic. "Surgical treatment of secondary hip osteoarthritis using cementless total hip endoprosthesis with Fitmore® Hip Stem: A case report." Vojnosanitetski pregled 74, no. 8 (2017): 791–94. http://dx.doi.org/10.2298/vsp151223198g.
Full textAbstract:
Introduction. Hip dysplasia with subluxation represents insufficient coverage of the femur's head placed in the dysplastic acetabulum. This lack of coverage ranges from barely noticeable to condition where half of femur head is uncovered by acetabulum. The caput-collum-diaphyseal angle of the proximal femur and anteversion angle of collum are increased, Wiberg?s angle is less than 15? and M?nard-Shenton line is interrupted. Hip joint degeneration occurs very early. When radiological signs of hip joint degenerative changes are discovered in elderly they are associated with pain, limited movements and leg shortening. Case report. We present a 53-year old female treated conservatively in childhood because of hip diyplasia with subluxation. After pregnancy, right hip pain emerged. Clinical and radiological examinations revealed hip subluxation with the signs of degenerative osteoarthritis. Initial treatment was conservative and included drugs and balneophysical procedures. Since pain and movement impairment progressed and became constant, a hip replacement using cementless total endoprosthesis with Fitmore? Hip Stem was done. In the pre-operative preparation, anteroposterior x-ray of the hip(with third of the proximal femur) was made. This X-ray enabled precise planning of implantation endoprosthesis component. The early postoperative course was uneventful with very good therapeutic effect. Following successful physical rehabilitation, the patient returned to work and full life activity. Conclusion. Implantation of the cementless endoprosthesis with Fitmore? Hip Stem in the treatment of secondary hip osteoarthritis is a good choice in the treatment of young patients with good bone quality. Future clinical and radiological follow-up and comparative studies are needed to show the advantages of this type of stem compared to the classical cementless long stem.
7
Elangovan, Bharathi, Bhadrinath Srinivasan, Vignesh Kailasam, and Sridevi Padmanabhan. "Comparison of the collum angle of incisors and canines in skeletal malocclusions – A CBCT study." International Orthodontics 18, no. 3 (September 2020): 468–79. http://dx.doi.org/10.1016/j.ortho.2020.06.006.
Full text
8
Shen, Yen-Wen, Jui-Ting Hsu, Yi-Hui Wang, Heng-Li Huang, and Lih-Jyh Fuh. "The Collum angle of the maxillary central incisors in patients with different types of malocclusion." Journal of Dental Sciences 7, no. 1 (March 2012): 72–76. http://dx.doi.org/10.1016/j.jds.2012.01.010.
Full text
9
Selvan, Subashree Rathi, Saravana Pandiyan K, and Ravindra Kumar Jain. "Comparison of Maxillary Central Incisor Labial Crown-Root Angle with Collum Angle in Class I and Class II Division 2 Malocclusion." Journal of Evolution of Medical and Dental Sciences 9, no. 33 (August 17, 2020): 2324–28. http://dx.doi.org/10.14260/jemds/2020/505.
Full text
10
Blum, Sophia, Lea Franken, Albrecht Hartmann, Falk Thielemann, Verena Plodeck, Dirk Danowski, Jens-Peter Kühn, Ralf-Thorsten Hoffmann, Klaus-Peter Günther, and Jens Goronzy. "MRI-based static and functional assessment of complex hip deformities in comparison with CT: a validation study." Magnetic Resonance Materials in Physics, Biology and Medicine 33, no. 6 (April 22, 2020): 829–38. http://dx.doi.org/10.1007/s10334-020-00845-5.
Full textAbstract:
Abstract Objective This study aimed at investigating the agreement between predefined quantitative parameters of hip morphology derived from magnetic resonance imaging (MRI) and virtual range of motion (ROM) analysis using computed tomography (CT) as standard of reference. Methods Twenty patients (13 females, 7 males, 16–59 years) with hip deformities underwent MRI prior to surgery. Clockwise alpha angle, femoral head and neck diameter, collum caput diaphysis angle, femoral torsion, center-edge angles, acetabular coverage of the femoral head, sourcil angle, and acetabular anteversion were measured. Additionally, tern single and combined movements were simulated using a motion analysis program. The MRI findings were compared with the corresponding results obtained by CT. Correlation of MRI with CT was assessed using different statistical methods (intraclass correlation coefficient, Bland–Altmann plot, two one-sided t test), and linear regression analysis was performed. Results The results showed near-perfect intraclass correlation coefficients (ICCs) for anteversion (0.95), acetabular sector angles (0.98–0.99), sourcil angle (0.95), and acetabular coverage (anterior 0.96, posterior 0.99). Intermethod correlation for femoral parameters showed almost perfect agreement except for the alpha angle (0.73–0.97). No significant proportional bias was detected for traditional acetabular and femoral parameters. ROM analysis was performed for 370 movements in 37 hips. For 78.4% (290/370) of the movements analysed, neither CT nor MRI detected impingement across the physiological ROM. For 18.6% (69/370) of the movements, impingement was detected by both CT and MRI, while 2.2% (8/370) of the movements with impingement in CT showed no impingement in MRI, and 0.8% (3/370) of the movements with impingement in MRI had no corresponding result in CT. Conclusion Finally, it was concluded that MRI-based assessment of hip morphology and virtual ROM analysis is feasible and can be performed with good intermethod agreement in comparison to the gold standard (CT). Therefore, MRI appears to be substantially equivalent to CT for use in virtual ROM analysis and so may reasonably be used in place of CT for this purpose.
Dissertations / Theses on the topic "Collum angle"
1
Bauer, Thomas J. "Maxillary central incisor crown-root relationships in Class I normal occlusions and Class II division 2 malocclusions." Thesis, University of Iowa, 2014. https://ir.uiowa.edu/etd/4572.
Full textAbstract:
Introduction: The purposes of this study were several. The first was to establish a mean value for the crown-to-root angle, or collum angle (CA), for maxillary central incisors in Class I normal occlusions. The second was to create a new crown-to-root angle based on anatomic points, the labial crown-root angle (LCRA), and correlate it with the CA for Class I normal occlusions and Class II division 2 malocclusions. Third, torque values were measured for maxillary central incisors using these anatomic points, and mean values were calculated for Class I normal occlusions and Class II division 2 malocclusions. Finally, mean values for CA and LCRA were analyzed for Class I normal occlusions and Class II division 2 malocclusions to detect differences between the two groups. Methods: 51 Class I normal samples and 42 Class II division 2 samples who met the inclusion criteria were studied cephalometrically. Relevant landmarks were placed, analyzed for reliability, and recorded for the measurements of interest. Results: The mean CA for Class I normal occlusions was not statistically different from zero (p= .0657). A strong increasing correlation between CA and LCRA was found for all samples (Pearson's correlation coefficient = 0.88, p < .0001). Mean torque values for Class I normal occlusions and Class II division 2 malocclusions were statistically different (3.95±10.85 degrees vs. 12.54±5.82 degrees, p < .0001). The mean CA for Class I normal occlusions and Class II division 2 malocclusions were statistically different (4.29±5.77 degrees vs. 1.78±3.94 degrees, p = .0178). The mean LCRA for Class I normal occlusions and Class II division 2 malocclusions were statistically different (31.60±4.24 degrees vs. 34.84±5.95 degrees, p = .00037). Conclusions: The mean CA in Class I normal occlusions is not statistically different from zero degrees. The LCRA is strongly correlated with the CA in both Class I normal occlusions and Class II division 2 malocclusions. The mean maxillary central incisor torque values for Class I normal occlusions is similar to that found in bracket prescriptions currently offered. Patients with Class II division 2 malocclusion exhibit statistically higher mean CA and LCRA values than patients with Class I ideal occlusion.
2
Jokubaitienė, Toma. "Baltumo ir juodumo konceptai lietuvių ir anglų kalbose." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20090916_093356-45879.
Full textAbstract:
Visose pasaulio kalbose yra terminai spalvoms reikšti, tačiau priklausomai nuo ekstralingvistinių veiksnių, skirtingos tautos turi nevienodą jų skaičių. Išanalizavę dešimtis kalbų lingvistai B. Berlinas ir P. Kėjus nustatė, jog ankstyvame kalbų raidos etape tebuvo du žodžiai spalvoms apibrėžti: vienas - tamsioms, kitas – šviesioms. Šviesai atstovauja balta spalva, tamsai – juoda.
Į prototipines baltumo ir juodumo konceptų reikšmes (baltas, -a – sniego spalvos, visai šviesus, juodas, -a – visiškai tamsus, kaip anglis) remiasi nemažai metaforinių reikšmių. Šio magistro darbo tikslas – išskirti skirtingas ir bendras baltumo ir juodumo metaforines reikšmes, būdingas lietuvių ir anglų kalboms. Tyrimo medžiagą sudaro lietuvių kalbos tekstyno grožinės literatūros blokas ir anglų kalbos tekstyno medžiaga.
Išanalizavus tekstyno medžiagą nustatyta, jog prototipinės juodo reikšmės: tamsus, neperregimas, tankus, gilus; nešvarus, suteptas; rasė, gymis; rūšies pavadinimas; kava, arbata; metaforinės reikšmės: nešvarus, nedoras; prastas apie maistą (tik lietuvių kalboje); blogis: a) viduje išgyvenamas (emocijos); b) bauginantys, tragiški, nelaimingi įvykiai, su jais sietinos vietos; sunkus, kasdienis; neteisėta veikla, tokios veiklos rezultatai; simbolinės reikšmės: artėjančios nelaimės simbolis; nelaimės pranašai (blogio simboliai); gedulo simbolis.
Tekstyno medžiagos analizė parodė, jog prototipinės balto reikšmės: šviesa; perregimas, bespalvis; švara; tuštuma; rasė, gymis; rūšies... [toliau žr. visą tekstą]Every language has colour terms, but different amount of them depending on extra linguistic features. Linguist B. Berlin and P. Kay analysed dozens of languages and determined that there were only two colour terms (dark and bright) in the first stage of language evolution. Bright is represented by white and dark is represented by black. Many metaphoric meanings are based on prototypical meanings of concepts of whiteness (white – of colour of snow, very bright) and blackness (black – very dark, like coal). The goal of this master thesis is to determine common and different metaphorical meanings of whiteness and blackness characteristic for Lithuanian and English languages. The research material is collected from corpuses of Lithuanian and English languages. The data of the analysis of both concepts showed, blackness and whiteness in most cases are used to identify a feature of colour, i.e. prototypical colour meaning. But it also revealed a number of cases when the colour term does not denote a colour feature, but it is used metaphorically, with objects lacking the colour feature. The analysis has also revealed the importance of the symbolic meaning in the research of the colour concepts. The concept of Blackness in both languages is perceived similarly. Prototypical meanings are the following: dark, lacking light, impenetrable, soiled; used to characterize dark skin pigmentation; certain object in black colour (blackcurrant, black bread and etc.); (coffee or tea) without... [to full text]
3
Lathuillière, Damien. "Étude du comportement et du renforcement d’appuis sollicités en compression selon un angle donné du bois lamellé-collé." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0196/document.
Full textAbstract:
L’objectif de cette étude est de comprendre le comportement d’éléments en bois lamellé-collé sollicités en compression selon un angle donné incluant le renforcement par frettage de vis. Les résultats expérimentaux montrent que le critère en absence de renforcement fonctionne sur l’association de la résistance de compression et de la résistance de cisaillement associée à trois facteurs fonction des données géométriques. Cette association est par la suite traduite par un calcul géométrique d’une longueur efficace tenant compte des longueurs de débord et zones d’interaction. En présence de renforcement, le critère fonctionne sur l’association de cette longueur efficace traduisant un effet de diffusion de l’effort et de l’effort repris par les vis de renforcement. Une démarche est proposée pour choisir entre les deux modes de rupture dits unitaires observés sur une vis ; la portance de la vis et le flambement de la vis. Cependant, l’effort apporté par les vis peut être traduit par un calcul géométrique d’une longueur efficace permettant d’intégrer le troisième mode de rupture, appelé « Compression en pointe de vis ». Cet objectif a donc permis au final d’élaborer une règle de dimensionnement pour les éléments sollicité en compression selon un angle donné avec ou sans renforcementsThe objective of this study is to understand and model the behaviour of glulam beam solicit compression at given angle to the grain including reinforcement of self-tapping screw. Experimental results show that the tests in the absence of reinforcement operate on the association between the compression strength and the shear strength associated with three factors based on geometric data. This association is translated by a geometric calculation of effective length taking into account the lengths of overhang and interactions. In the presence of reinforcement, the test works on the association of the effective length reflecting a spreading effect and the effort takes by reinforcing screws. An approach is proposed to choose between the two failures modes observed on a screw called; the withdrawal of the screw and the buckling of the screw. However, the effort made by the screws can be translated by a geometric calculation of effective length for integrating third failure mode called "Compression in a plane formed by the screw tips". This objective has therefore enabled the development of a final dimensioning rule for the elements under compression at a given angle with or without reinforcements
4
Eratak, Deniz Ozlem. "Determination Of Contact Angles Of Powders By Capillaric Dewatering Of Filter Cakes." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605901/index.pdf.
Full textAbstract:
Solid-liquid contact angle is an important parameter in many particulate processes of the mineral, ceramic and chemical industries. In particular, modification of the contact angle through surface active agents plays a crucial role in froth flotation of minerals. In the case of flat solid surfaces, direct measurement of the contact angle is possible. However, such flat surfaces can not be obtained with finely divided solids typically encountered in flotation applications. Then, indirect methods based on powder beds as thin layers of powders deposited on glass plates or packed columns are used for the determination of apparent contact angles.
This thesis presents an alternative novel method based on the capillaric dewatering of filter cakes for the measurement of the receding contact angle and correlates the contact angles measured as such with column wicking and micro-flotation test results of zircon and rutile mineral particles. The experimental procedure is simple and fast. The results have proven that the proposed method is reliable and give a good measure of the contact angle in the absence and presence of surface active non-wetting agents.
5
Helt, Sophie. "Traitement de surface et propriétés acido-basiques d'un carbure de silicium : application au collage structural du SiC." Toulouse, INPT, 1998. http://www.theses.fr/1998INPT002C.
Full textAbstract:
Le carbure de silicium (SiC) présente des caractéristiques (rigidité, dureté, inertie chimique, stabilité dimensionnelle), qui font de lui un matériau prometteur pour le domaine aérospatial (ex : miroirs de satellites). Cependant, ses propriétés vont de pair avec une grande fragilité qui interdit toute technique d'assemblage classique, tel que le rivetage, et qui privilégie le collage structural. Les propriétés des surfaces à assembler sont de la plus haute importance et dans de nombreux problèmes de collage, Les traitements de surface sont largement responsables d'une adhésion de bonne qualité entre le substrat et l'adhésif. Trois types de traitement (mécanique, thermique et chimique) sont utilisées dans cette étude afin d'optimiser l'adhésion du SiC. Les résultats obtenus sont riches en informations et permettent d'observer une bonne corrélation entre les caractéristiques de la surface et les performances mécaniques des assemblages. En particulier, des mesures d'energie de surface des substrats font nettement ressortir le rôle de la chimie superficielle dans les processus d'adhésion. L'utilisation d'une méthode originale, basée sur la méthode de la goutte posée, dont le principe consiste à analyser l'évolution des angles de contact en fonction du PH de la solution aqueuse déposée sur la surface permet de caractériser les propriétés acido-basiques des surfaces au sens de Bronsted et de les relier aux propriétés adhésives. Une étroite corrélation a pu être mise en évidence entre le comportement acide-base et la composition chimique de la surface déterminée par XPS.
6
Koschewski, Susanne. "Vergleichende Studie der Blutflussdetektionsverfahren Farbdoppler und Amplitudenkodierter Doppler mit einem grauwertmodulierten Verfahren am Flussphantom." Doctoral thesis, Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-217857.
Full textAbstract:
Das bildgebende Prinzip des B-Flow® beruht nicht auf dem Dopplereffekt und hat dadurch Vorteile gegenüber den Dopplerverfahren bezüglich Winkelabhängigkeit, Orts- und Zeitauflösung. Das Verfahren zeichnet sich vor allem durch eine sehr wirklichkeitsgetreue überlagerungsfreie Echtzeitdarstellung von Blutfluss aus (WESKOTT 2000). Veterinärmedizinische Untersuchungen zum B-Flow® gibt es nur wenige (KIEFER et al. 2002) (KIEFER et al. 2004). Um Möglichkeiten und Grenzen dieses neuen Flussdetektionsverfahrens zu evaluieren, wurde folgende Untersuchung durchgeführt.
Material und Methoden
An verschiedenen Flussphantomen wird die Darstellbarkeit und Genauigkeit der Flussdarstellung vergleichend für den Farbdoppler, Powerdoppler und für B-Flow® untersucht. Der Einfluss von Untersuchungstiefe, Gefäßdurchmesser, Fluss-geschwindigkeit, Einfallswinkel der Schallwellen und Hämatokritwert auf Darstellbarkeit und Genauigkeit aller drei Verfahren wurde unter standardisierten Bedingungen analysiert.
Die Flussphantome bestehen aus Plastikgefäßen, die mit Gewebeimitat aus Stärke, Gelatine und Wasser befüllt wurden und deren Innenraum mit jeweils einem Silikonschlauch des Innendurchmessers 1 mm, 2 mm beziehungsweise 5 mm in einem Winkel von 30°, 60° oder 90° durchzogen wurden. Durch die Schläuche wurde mit Hilfe einer Flusspumpe porcines Blut der Hämatokritstufen 10 %, 30 % und 60 % in vier verschiedenen Flussgeschwindigkeiten (0,4 m/s, 0,8 m/s, 1,2 m/s und 1,4 m/s) ge¬pumpt. Die Kombinationen dieser Parameter wurden jeweils in einer Tiefe von 3 cm, 5 cm und 7 cm untersucht. Die Darstellung erfolgte mit einem in seiner Position fixierten ML12 Matrixlinearschallkopf an einem Logiq 9 der Firma General Electrics. Aus den für jede Einstellungskombination erstellten Videosequenzen wurden Standbilder erstellt, im DICOM-Format gespeichert und mit einer für diesen Versuch entwickelten Software nachvermessen.
Für die Beurteilung der Darstellbarkeit wurde ein Scoresystem eingeführt. Für die Beurteilung der Genauigkeit der Darstellung wurde aus der Differenz des gemessenen Lumens mit dem tatsächlichen Gefäßinnendurchmesser die absolute Abweichung in mm berechnet und bezüglich der Einflussgrößen ausgewertet.
Ergebnisse
Die Darstellbarkeit des B-Flow® war den Dopplerverfahren bei 5 mm Gefäßdurchmesser in 3 cm Tiefe überlegen. In Tiefen ab 5 cm ist die Aussagekraft des Verfahrens stark eingeschränkt. In 7 cm Tiefe ist B-Flow® nicht sinnvoll einsetzbar.
Es konnte ein Einfluss des Einfallswinkels der Schallwellen sowohl für die Darstellbarkeit als auch für die Genauigkeit der Messung auf alle drei Verfahren festgestellt werden. Nur in 3 cm Tiefe bei einem Gefäßdurchmesser von 5 mm konnte bezüglich der Darstellbarkeit für den B-Flow® eine Winkelunabhängigkeit bestätigt werden. Der Hämatokritwert hatte bei allen drei Verfahren weder auf die Darstellbarkeit noch auf die Genauigkeit einen signifikanten Einfluss. Der Einfluss der Flussgeschwindigkeit auf die Darstellbarkeit war für alle drei Verfahren nicht signifikant. Auf die Genauigkeit konnte ein signifikanter Einfluss nachgewiesen werden. Je schneller der Fluss, desto größer werden die Werte für die absolute Abweichung.
Für die Darstellung oberflächennaher Blutflüsse eignet sich B-Flow® sehr gut. Durch die weniger aufwändigen Einstellungsmodalitäten und die sehr detailgetreue Darstellung von Flussmustern ergänzt die Methode mit wesentlichen Zusatzinformationen die Dopplerverfahren.
7
Cha, Kyungduck. "Cancer treatment optimization." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22604.
Full textAbstract:
Thesis (Ph. D.)--Industrial and Systems Engineering, Georgia Institute of Technology, 2008.Committee Chair: Lee, Eva K.; Committee Member: Barnes, Earl; Committee Member: Hertel, Nolan E.; Committee Member: Johnson, Ellis; Committee Member: Monteiro, Renato D.C.
8
Tristão, Gustavo Alves. "Análise teórica e experimental de ligações viga mista-pilar de extremidade com cantoneiras de assento e alma." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-28092006-101125/.
Full textAbstract:
Este trabalho apresenta um estudo numérico e experimental do comportamento estrutural das ligações viga mista-pilar com cantoneiras de assento e alma. No estudo teórico foi desenvolvido, com base nos EUROCODES 3 e 4, um procedimento para avaliação do comportamento das ligações mistas com cantoneiras de alma e assento e com chapa de topo. O trabalho de investigação experimental, abrangendo modelos submetidos a carregamentos monotônico e cíclico, foi realizado no Instituto Superior Técnico (IST), Portugal, em que o objetivo principal foi avaliar a influência da força axial de compressão no pilar para o comportamento do painel da alma do pilar, e conseqüentemente no comportamento global da ligação mista localizada em nó de extremidade. Nos ensaios experimentais foram analisadas as rotações e deformações no painel da alma do pilar sem e com enrijecedor na alma do pilar. Adicionalmente, a eficiência da ancoragem das barras de armadura longitudinal foi verificada. Paralelamente à investigação experimental, um estudo numérico de ligações mistas foi realizado por meio do modelo em elementos finitos, o qual mostrou-se representativo, tornando-se uma ferramenta para análises paramétricas.This work presents a numerical and experimental study of the structural behavior of beam-to-column composite joints with bottom and web angle connections. In the theoretical study, basing in EUROCODES 3 and 4, an analytic procedure for evaluation the static behavior of beam-to-column composite joints with bottom and web angle connections was developed. The experimental test program, enclosing monotonic tests and a cyclic test, was carried out at the Instituto Superior Técnico of Lisbon (IST), where the main objective was to evaluate the effect of column axial load on column web panel and consequently in the global behavior of single-sided composite joint. In the tests, the panel zone rotations and deformations were analyzed for stiffened and unstiffened column web. In addition, the efficiency of the main rebar was verified. Finally, a thorough of finite element model, a numerical study of composite joints was developed. This model was found to be representative and reliable as a tool to futures parametric analyses.
9
Stloukal, Štěpán. "Zesílení ŽB sloupu pomocí ocelové bandáže." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265384.
Full textAbstract:
The steel bandage is an economical and effective widely used method for strengthening RC columns. Diploma thesis reviews most common design proposals for the types of the bandage with directly loaded and not directly loaded steel angles. This work also includes a comparison of the different constitutive laws for confined concrete. In order to simulate real behaviour of strengthened structure the numerical analysis has been carried out using non-linear software ATENA. According to the European standards and adopted hypotheses the simplified analytical model has been derived to be able to calculate load-bearing capacity of a strengthened column under normal force and bending moment. The proposed model considers the contribution in confinement pressure caused by steel bandage and the contribution of directly loaded angles. In addition, the direct application on real frame structure has been performed.
10
Koschewski, Susanne. "Vergleichende Studie der Blutflussdetektionsverfahren Farbdoppler und Amplitudenkodierter Doppler mit einem grauwertmodulierten Verfahren am Flussphantom." Doctoral thesis, 2015. https://ul.qucosa.de/id/qucosa%3A15252.
Full textAbstract:
Das bildgebende Prinzip des B-Flow® beruht nicht auf dem Dopplereffekt und hat dadurch Vorteile gegenüber den Dopplerverfahren bezüglich Winkelabhängigkeit, Orts- und Zeitauflösung. Das Verfahren zeichnet sich vor allem durch eine sehr wirklichkeitsgetreue überlagerungsfreie Echtzeitdarstellung von Blutfluss aus (WESKOTT 2000). Veterinärmedizinische Untersuchungen zum B-Flow® gibt es nur wenige (KIEFER et al. 2002) (KIEFER et al. 2004). Um Möglichkeiten und Grenzen dieses neuen Flussdetektionsverfahrens zu evaluieren, wurde folgende Untersuchung durchgeführt.
Material und Methoden
An verschiedenen Flussphantomen wird die Darstellbarkeit und Genauigkeit der Flussdarstellung vergleichend für den Farbdoppler, Powerdoppler und für B-Flow® untersucht. Der Einfluss von Untersuchungstiefe, Gefäßdurchmesser, Fluss-geschwindigkeit, Einfallswinkel der Schallwellen und Hämatokritwert auf Darstellbarkeit und Genauigkeit aller drei Verfahren wurde unter standardisierten Bedingungen analysiert.
Die Flussphantome bestehen aus Plastikgefäßen, die mit Gewebeimitat aus Stärke, Gelatine und Wasser befüllt wurden und deren Innenraum mit jeweils einem Silikonschlauch des Innendurchmessers 1 mm, 2 mm beziehungsweise 5 mm in einem Winkel von 30°, 60° oder 90° durchzogen wurden. Durch die Schläuche wurde mit Hilfe einer Flusspumpe porcines Blut der Hämatokritstufen 10 %, 30 % und 60 % in vier verschiedenen Flussgeschwindigkeiten (0,4 m/s, 0,8 m/s, 1,2 m/s und 1,4 m/s) ge¬pumpt. Die Kombinationen dieser Parameter wurden jeweils in einer Tiefe von 3 cm, 5 cm und 7 cm untersucht. Die Darstellung erfolgte mit einem in seiner Position fixierten ML12 Matrixlinearschallkopf an einem Logiq 9 der Firma General Electrics. Aus den für jede Einstellungskombination erstellten Videosequenzen wurden Standbilder erstellt, im DICOM-Format gespeichert und mit einer für diesen Versuch entwickelten Software nachvermessen.
Für die Beurteilung der Darstellbarkeit wurde ein Scoresystem eingeführt. Für die Beurteilung der Genauigkeit der Darstellung wurde aus der Differenz des gemessenen Lumens mit dem tatsächlichen Gefäßinnendurchmesser die absolute Abweichung in mm berechnet und bezüglich der Einflussgrößen ausgewertet.
Ergebnisse
Die Darstellbarkeit des B-Flow® war den Dopplerverfahren bei 5 mm Gefäßdurchmesser in 3 cm Tiefe überlegen. In Tiefen ab 5 cm ist die Aussagekraft des Verfahrens stark eingeschränkt. In 7 cm Tiefe ist B-Flow® nicht sinnvoll einsetzbar.
Es konnte ein Einfluss des Einfallswinkels der Schallwellen sowohl für die Darstellbarkeit als auch für die Genauigkeit der Messung auf alle drei Verfahren festgestellt werden. Nur in 3 cm Tiefe bei einem Gefäßdurchmesser von 5 mm konnte bezüglich der Darstellbarkeit für den B-Flow® eine Winkelunabhängigkeit bestätigt werden. Der Hämatokritwert hatte bei allen drei Verfahren weder auf die Darstellbarkeit noch auf die Genauigkeit einen signifikanten Einfluss. Der Einfluss der Flussgeschwindigkeit auf die Darstellbarkeit war für alle drei Verfahren nicht signifikant. Auf die Genauigkeit konnte ein signifikanter Einfluss nachgewiesen werden. Je schneller der Fluss, desto größer werden die Werte für die absolute Abweichung.
Für die Darstellung oberflächennaher Blutflüsse eignet sich B-Flow® sehr gut. Durch die weniger aufwändigen Einstellungsmodalitäten und die sehr detailgetreue Darstellung von Flussmustern ergänzt die Methode mit wesentlichen Zusatzinformationen die Dopplerverfahren.:1 Einleitung und Fragestellung 1
2 Literaturübersicht 3
2.1 Geschichtlicher Überblick der Ultraschalldiagnostik 3
2.1.1 Die Ultraschalldiagnostik in der Tiermedizin 3
2.2 Allgemeine Grundlagen der Sonographie 3
2.3 Dopplersonographie 5
2.3.1 Doppler-Spektralanalyse-Verfahren 6
2.3.2 Farbkodierte Duplexsonographie, FKDS 9
2.3.3 Amplitudenkodierter Doppler, Power Doppler, PDI 12
2.4 B-Flow® 13
2.4.1 Prinzip 14
2.4.2 Vergleich der Eigenschaften von B-Flow® , FKDS und PDI 16
2.4.3 Vorteile des B-Flow® gegenüber anderen Verfahren 16
2.4.4 Nachteile des B-Flow® 18
2.4.5 Einsatz in der Humanmedizin 19
2.4.6 Einsatz in der Veterinärmedizin 20
2.5 Eigenschaften des Blutflusses 21
2.6 Hämatokrit 23
2.7 Blutflussgeschwindigkeiten beim Hund 24
3 Material und Methoden 25
3.1 Technische Ausstattung 25
3.1.1 Ultraschallgerät 25
3.1.2 Schallkopf 25
3.2 Flussphantome 25
3.3 Blut 28
3.4 Verfahren 31
3.5 Geräteeinstellung 32
3.5.1 Messfenster 32
3.5.2 Fokuszone 33
3.5.3 Verstärkung 33
3.5.4 Pulswiederholungsfrequenz (PRF) 34
3.5.5 Farbverstärkung 34
3.6 Untersuchungsablauf 35
3.7 Datenerhebung 36
3.7.1 Darstellbarkeit – Score 36
3.7.2 Messung des dargestellten Lumens 38
3.8 Statistische Methodik 39
4 Ergebnisse 40
4.1 Darstellbarkeit 40
4.1.1 Allgemeiner Vergleich der Darstellbarkeit der drei Verfahren 40
4.1.2 Einfluss der Untersuchungstiefe auf die Darstellbarkeit 41
4.1.3 Einfluss des tatsächlichen Gefäßdurchmessers auf die Darstellbarkeit 45
4.1.4 Einfluss der Flussgeschwindigkeit auf die Darstellbarkeit 48
4.1.5 Einfluss des Einfallswinkels auf die Darstellbarkeit 49
4.1.6 Einfluss des Hämatokrit auf die Darstellbarkeit 51
4.2 Genauigkeit der Darstellung 53
4.2.1 Allgemeiner Vergleich der absoluten Abweichung der drei Verfahren 53
4.2.2 Einfluss der Untersuchungstiefe auf die Genauigkeit der Messung 54
4.2.3 Einfluss des tatsächlichen Gefäßdurchmessers auf die Genauigkeit 57
4.2.4 Einfluss der Flussgeschwindigkeit auf die Genauigkeit 61
4.2.5 Einfluss des Einfallswinkels auf die Genauigkeit der Messung 64
4.2.6 Einfluss des Hämatokritwertes auf die Genauigkeit der Messung 70
5 Diskussion 73
5.1 Diskussion der Methoden 73
5.1.1 Ultraschallgerät 73
5.1.2 Schallkopf 73
5.1.3 Geräteeinstellung 74
5.1.4 Flussphantome 75
5.1.5 Verwendung von porcinem Blut 76
5.1.6 Hämatokrit 77
5.1.7 Flussgeschwindigkeit 78
5.1.8 Pulsatiler Fluss 79
5.1.9 Datenerhebung 80
5.2 Diskussion der Ergebnisse 80
5.2.1 Darstellbarkeit allgemein 80
5.2.2 Darstellbarkeit in Abhängigkeit von der Untersuchungstiefe 81
5.2.3 Darstellbarkeit in Abhängigkeit vom tatsächlichen Gefäßdurchmesser 82
5.2.4 Darstellbarkeit in Abhängigkeit von der Flussgeschwindigkeit 82
5.2.5 Darstellbarkeit in Abhängigkeit vom Einfallswinkel der Schallwellen 83
5.2.6 Darstellbarkeit in Abhängigkeit vom Hämatokrit 84
5.2.7 Messgenauigkeit allgemein 85
5.2.8 Einfluss der Untersuchungstiefe auf die Messgenauigkeit 85
5.2.9 Einfluss des tatsächlichen Durchmessers auf die Messgenauigkeit 86
5.2.10 Einfluss der Flussgeschwindigkeit auf die Messgenauigkeit 86
5.2.11 Einfluss des Einfallswinkels auf die Messgenauigkeit 87
5.2.12 Einfluss des Hämatokrit auf die Messgenauigkeit 88
6 Klinische Schlussfolgerungen 90
7 Zusammenfassung 91
8 Summary 93
9 Literaturverzeichnis 95
10 Anhang 103
10.1 Verzeichnis der Abbildungen 103
10.2 Verzeichnis der Tabellen 110
Books on the topic "Collum angle"
1
Richter, Judith. ha- Poṭentsyal ha-ṭamun be-ṭekhnologyot miśrad ṿe-tiḳshoret mitḳadmot le-fizur ukhlusin ṿe-taʻasuḳah be-Yiśraʼel: (kolel taḳtsir ʻIvri ṿe-Angli). [Tel Aviv]: Mekhon Goldah Meʼir le-ḥiḳre ʻavodah ṿe-ḥevrah, 1989.
Find full text
2
Jackson, Stephen, and Peter Schouten. Gliding Mammals of the World. CSIRO Publishing, 2012. http://dx.doi.org/10.1071/9780643104051.
Full textAbstract:
The world's gliding mammals are an extraordinary group of animals that have the ability to glide from tree to tree with seemingly effortless grace. There are more than 60 species of gliding mammals including the flying squirrels from Asia, Europe and North America, the scaly-tailed flying squirrels from central Africa and the gliding possums of Australia and New Guinea. But the most spectacular of all are the colugos – or so called flying lemurs – that occur throughout South-East Asia and the Philippines.
Animals that glide from tree to tree descend at an angle of less than 45 degrees to the horizontal, while those that parachute descend at an angle greater than 45 degrees. Gliding is achieved by deflecting air flowing past well-developed gliding membranes, or patagia, which form an effective airfoil that allows the animal to travel the greatest possible horizontal distance with the least loss in height. The flying squirrels and scaly-tailed flying squirrels even have special cartilaginous spurs that extend either from the wrist or elbow, respectively, to help support the gliding membrane.
Gliding Mammals of the World provides, for the first time, a synthesis of all that is known about the biology of these intriguing mammals. It includes a brief description of each species, together with a distribution map and a beautiful full-colour painting. An introduction outlines the origins and biogeography of each group of gliding mammals and examines the incredible adaptations that allow them to launch themselves and glide from tree to tree.
3
Allen, Keith. Perceptual Constancy and Apparent Properties. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199666416.003.0002.
Full textAbstract:
Properties like shape, size, and colour exhibit perceptual constancy: they appear to remain constant throughout variations in the conditions under which they are perceived. A number of writers have suggested that “apparent properties”, mind-independent relational properties that vary with the perceptual conditions, play an essential role in explaining perceptual constancy. On this view, when we see, e.g. a penny from an oblique angle, we see the circularity of the penny by or in virtue of seeing a mind-independent relational apparent property (its elliptical look). This chapter argues that views which explain the perception of constant properties of objects by appealing to perception of mind-independent apparent properties are structurally similar to sense-datum theories of perception; as such, they face many of the same challenges. It concludes that apparent properties play at best a modest explanatory role, functioning as the objects of awareness when we direct our attention in the appropriate ways.
4
Lindenmayer, David, Christopher MacGregor, Nick Dexter, Martin Fortescue, and Esther Beaton. Booderee National Park. CSIRO Publishing, 2014. http://dx.doi.org/10.1071/9781486300433.
Full textAbstract:
Booderee National Park at Jervis Bay, 200km south of Sydney, attracts over 450,000 visitors each year. The park has many special features, including dramatic wave cut platforms and sea caves, some of the whitest beach sands in Australia, and very high densities of native predators such as the Powerful Owl and the Diamond Python. This book outlines the biology and ecology of Booderee National Park.
Booderee packs an extraordinary level of biodiversity into a small area (roughly 6500 hectares), with more than 260 species of terrestrial vertebrates and over 625 species of plants. It is home to species of significant conservation concern, such as the globally endangered Eastern Bristlebird for which the park is one of its last and most important strongholds. The diversity of vegetation is also astounding: in some parts of the park, it is possible to walk from ankle-high sedgelands, through woodlands and forest and into subtropical rainforest in less than 150 metres.
The book highlights how Booderee National Park is a functional natural ecosystem and, in turn, how management practices aim to improve environmental conditions and promote biodiversity conservation. Richly illustrated with colour images from award-winning photographer Esther Beaton, it will delight visitors to the park as well as anyone with an interest in natural history.
Book chapters on the topic "Collum angle"
1
Scholl, Hendrik P. N., and Eberhart Zrenner. "Motion thresholds of coloured stimuli of different luminance contrasts are increased in ocular hypertension and early primary-open-angle-glaucoma (POAG)." In Colour Vision Deficiencies XII, 73–85. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0507-1_10.
Full text
2
Heere, Cees. "Introduction." In Empire Ascendant, 1–7. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198837398.003.0001.
Full textAbstract:
The formation of the Anglo-Japanese alliance in February 1902 marked an important moment in modern diplomatic history: for the first time in decades, a European power concluded a nominally equal defensive partnership with an Asian state. But the alliance’s crossing of the ‘global colour line’ was politically fraught from the outset, and would become more so as Japan came to pose an ever more explicit challenge to the racial orders on which the British imperial system rested. While Japan came to play a pivotal role in the geostrategic security of the British Empire in Asia, it was simultaneously denounced as a ‘yellow peril’ to British (or ‘Anglo-Saxon’) ascendancy in the Pacific. By examining the Anglo-Japanese relationship along the twinned arcs of empire and race, this book does two things. First, it offers new insight in how Japan’s integration in the international order was complicated by race. Second, it shows how the Japanese ‘question’ came to shape the evolution of the Edwardian British Empire.
3
Huang, Stephen. "Common Doppler artefacts and pitfalls." In Oxford Textbook of Advanced Critical Care Echocardiography, edited by Anthony McLean, Stephen Huang, and Andrew Hilton, 21–36. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780198749288.003.0002.
Full textAbstract:
Artefacts are spurious signals that do not represent true signals or physical structures. It is important to differentiate artefacts from genuine signals in ultrasound studies as this may help avoid misinterpretations and measurement errors. The nature of many Doppler ultrasound artefacts is similar to 2D echocardiography artefacts, including inappropriate gain settings, mirror artefacts, and reverberation artefacts. However, as Doppler ultrasound is used to detect blood flow and myocardial velocity, it is susceptible to insonation (Doppler) angle error, aliasing, and other velocity-related artefacts. These will be presented in this chapter as two main types of artefacts: one that is related to spectral Doppler, and the other related to colour-flow Doppler ultrasound.
4
Needham, R., R. Naemi, and N. Chockalingam. "Advancements in data analysis and visualisation techniques to support multiple single-subject analyses: an assessment of movement coordination and coordination variability." In Studies in Health Technology and Informatics. IOS Press, 2021. http://dx.doi.org/10.3233/shti210454.
Full textAbstract:
Vector coding is a data analysis technique that quantifies inter-segmental coordination and coordination variability of human movement. The usual reporting of vector coding time-series data can be difficult to interpret when multiple trials are superimposed on the same figure. This study describes and presents novel data visualisations for displaying data from vector coding that supports multiple single- subject analyses. The dataset used in this study describes the lumbar-pelvis coordination in the transverse plane during a gait cycle. The data visualisation techniques presented in this study consists of the use of colour and data bars to map and profile coordination pattern and coordination variability data. The use of colour mapping provides the option to classify commonalities and differences in patterns of coordination between segment couplings and between individuals across a big dataset. Data bars display segmental dominancy data that can provide an intuitive summary on coupling angle distribution over time. The data visualisation in this study may provide further insight on how people with adolescent idiopathic scoliosis perform goal-orientated movements following an intervention, which would support clinical management strategies.
5
"Copyright." In A Colour Atlas of Foot and Ankle Disorders, iii. Elsevier, 2007. http://dx.doi.org/10.1016/b978-0-443-10207-3.50001-x.
Full text
6
"Preface." In A Colour Atlas of Foot and Ankle Disorders, vi—viii. Elsevier, 2007. http://dx.doi.org/10.1016/b978-0-443-10207-3.50002-1.
Full text
7
"Acknowledgements." In A Colour Atlas of Foot and Ankle Disorders, ix. Elsevier, 2007. http://dx.doi.org/10.1016/b978-0-443-10207-3.50003-3.
Full text
8
"Introduction." In A Colour Atlas of Foot and Ankle Disorders, x—xxix. Elsevier, 2007. http://dx.doi.org/10.1016/b978-0-443-10207-3.50004-5.
Full text
9
FOSTER, A. "Infection." In A Colour Atlas of Foot and Ankle Disorders, 15–38. Elsevier, 2007. http://dx.doi.org/10.1016/b978-0-443-10207-3.50006-9.
Full text
10
FOSTER, A. "Circulatory disorders." In A Colour Atlas of Foot and Ankle Disorders, 39–68. Elsevier, 2007. http://dx.doi.org/10.1016/b978-0-443-10207-3.50007-0.
Full textConference papers on the topic "Collum angle"
1
Zapata, J. D., A. M. Cardenas, and G. A. Quintero. "Angle calculation of birefringence for the study of PMD using Mohr's circle in standard single mode fibers." In 2012 IEEE Colombian Communications Conference (COLCOM). IEEE, 2012. http://dx.doi.org/10.1109/colcomcon.2012.6233669.
Full text
2
Fischer, I. S., and R. N. Paul. "Kinematic Displacement Analysis of a Double-Cardan-Joint Driveline." In ASME 1987 Design Technology Conferences. American Society of Mechanical Engineers, 1987. http://dx.doi.org/10.1115/detc1987-0078.
Full textAbstract:
Abstract The input-output displacement relations of two Cardan joints arranged in series on a driveline has been investigated in detail, including the effects of unequal joints angles, the phase angle between the two Cardan joints and also such manufacturing tolerance errors as non-rigth angle link lengths and offset joint axes. A combined Newton-Raphson and Davidson-Fletcher-Powell optimization algorithm using dual-number coordinate-transformation matrices was employed to perform the analysis. An experiment was conducted to validate the results of the analysis. The apparatus consisted of a double-Cardan-joint driveline whose rotations were measured by optical shaft encoders that were sampled by a computer data-acquisition system. The equipment was arranged so that the phase angle between the joints and the offset angles between the shafts at each of the two joints could be readily varied. The “relative phase angle”, the difference between the phase angle of the two joints and the angle between the planes defined by the input and intermediate and the intermediate and output shafts, was found to be the significant factor. If the offset angles at both Cardan joints are equal, the double-Cardan-joint driveline function as a constant-velocity coupling when the magnitude of the relative phase angle is zero. If the offset angles at the two Cardan joints are unequal, a condition prevailing in the important front-wheel-drive automobile steering column, then fluctuation in output velocity for a constant input velocity is minimized although not eliminated for zero relative phase angle.
3
Evan-lwanowski, R. M., Hong-Yu Jia, and Chu-Ho Lu. "Cyclic Transition Through Combination Resonances of Parametric Laminated Angle-Ply Composite Columns." In ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0330.
Full textAbstract:
Abstract Cyclic transitions through combination resonances of a laminated angle-ply, three-degrees-of-freedom column subjected to a parametric (periodic axial) load have been studied using the asymptotic method. The study included the effects of the coupling stiffnesses, fiber orientations, ply-angles, geometrical nonlinearities, load eccentricities, initial (stationary) conditions, types of the temporal modes.
4
Huang, R., P. Wang, K. Nimsaila, and M. Vu. "Angle-dependent Water Column Statics Correction through Sparse TauP Inversion." In 78th EAGE Conference and Exhibition 2016. Netherlands: EAGE Publications BV, 2016. http://dx.doi.org/10.3997/2214-4609.201600581.
Full text
5
Halder, Paresh, and Abdus Samad. "Effect of Guide Vane Angle on Wells Turbine Performance." In ASME 2014 Gas Turbine India Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gtindia2014-8183.
Full textAbstract:
Wells turbines are used in oscillating water column wave energy system and the turbine has a stagger angle of 90°. Numerical analysis is performed to analyze the performance of the turbine in the present work. A commercial code ANSYS-CFX® v14.0 was used for the simulations at different flow coefficient, different angles and a constant rotational speed. The turbulence model was k-ω SST. Higher guide vane angle produced higher efficiency of the turbine and the efficiency (enhanced) change was contributed because of the vortex formation in different locations in the flow passage or near the blade surface.
6
Olmstead, D., C. R. Truman, P. Wayne, and P. Vorobieff. "Effects of inclination angle on a shock-accelerated heavy gas column." In MULTIPHASE FLOW 2015. Southampton, UK: WIT Press, 2015. http://dx.doi.org/10.2495/mpf150151.
Full text
7
Kwon, T. S., B. J. Yun, C. H. Song, K. Y. Choi, and H. K. Cho. "Effect of ECC Injection Angle on the Flow Distribution in a Downcomer Annulus During LBLOCA Reflood Phase in the Air-Water Test." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22388.
Full textAbstract:
The comparison tests for the direct ECC bypass fraction were experimentally performed with a typical DVI nozzle and an ECC column nozzle having injection angle to the gravity axis. The ECC column nozzle is newly introduced to make an ECC water column in the downcomer region. The injection angle of the ECC water relative to the gravity axis is varied from 0 to ±90 degrees stepped by 45 degrees. The tests are performed in the air-water separate effect test facility (DIVA), which is 1/7.07 linearly scaled-down of the APR1400 nuclear reactor. The test results show that the direct ECC bypass fraction is affected by the ECC injection angle when the ECC water is injected using an ECC column nozzle as a single water column. The injection angle of an ECC water column relative to the circumferential air jet in the DVI system affects the direct ECC bypass fraction during the reflood phase of a LBLOCA.
8
He, Xin, Yajing Liu, Hemayet Uddin, Ampalavanapillai Nirmalathas, and Ranjith Rajasekharan Unnithan. "Integration of Angle Independent CMY Nanorod Colour Filter mosaic on CMOS Image Sensor." In CLEO: Applications and Technology. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/cleo_at.2020.jtu2d.22.
Full text
9
Puvvula, Praneeth, Susheel Ravuri, Ajit Dubal, and Swapnil Salunkhe. "Optimizing Steering Column Layout and UJ Phase Angle to Enhance Vehicle Dynamics Performance." In Automotive Technical Papers. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-01-5010.
Full text
10
Koniusz, Piotr, and Krystian Mikolajczyk. "Spatial Coordinate Coding to reduce histogram representations, Dominant Angle and Colour Pyramid Match." In 2011 18th IEEE International Conference on Image Processing (ICIP 2011). IEEE, 2011. http://dx.doi.org/10.1109/icip.2011.6116639.
Full text