68 research outputs found
Juramentum Athei, Publica Dissertatione Expositum / Svb Præsidio Dn. Samuelis Friderici Willenberg ... d. XIX. Julii Anno M. DCC. VIII. Publico Placidoque Eruditorum Examini submittit Author Michael Ernestus Lassenius, Gedanensis
No full textThree‐dimensional ankle, subtalar, and hindfoot alignment of the normal, weightbearing hindfoot, in bilateral posture
No full textThe first goal of this study was to develop reliable three-dimensional definitions of alignment for the ankle, subtalar, and hindfoot joints. These alignments are based on three-dimensional morphological features derived from renderings of the bones obtained from weightbearing computer tomography. The second goal was to establish a database quantifying the alignment of the ankle, subtalar, and hindfoot joints in a healthy population during weightbearing bilateral standing. This level 1 study was performed on 95 normal subjects in which random subjects were recruited into a control group. Weightbearing computed tomography scans of the leg were collected in neutral, bilateral, standing posture. In 30 of the subjects, both the left and right leg was scanned. Six alignment parameters for each joint were calculated from morphological measurements conducted on three-dimensional renderings of the bones. Intra- and intertester reliability was assessed from repeated measurements by several testers. Analysis of variance statistics of the alignment parameters showed no statistical differences due to age, gender, or foot side. Intraclass correlation coefficient analysis showed excellent inter- and intratester reliability. It was concluded that the alignment process is comprehensive and reliable. Therefore, without classification by gender or age, it may be used as a foundation for quantifying abnormal alignment associated with various ankle deformities. Clinical significance: The alignment methodology and control database may be used to diagnose ankle, subtalar, and hindfoot misalignment. It can also serve as basis for surgical planning designed to restore normal alignment in various hindfoot pathologies, such as ankle realignment in total ankle replacement
Level of Fit of Two Fracture Fixation Plates to the Radius through Physical and Virtual Analysis
No full textFractures of the radius are commonly treated by open reduction and internal fixation by use of a fracture fixation plate. In doing so, the gap between the underside of the plate and the surface of the bone must be minimized, and contouring time of the plate to the radius shape must also be minimized. It is proposed that plates with an initial precontour to approximate the shape of the radius will best achieve these requirements. To this end, the goal of this study is to evaluate the bending time and the level of fit of precontoured plates versus standard plates in fracture fixation of the radius. Six cadaver arms were obtained, and their radii were extracted and cleaned of soft tissue. Precontoured plates designed by Acumed, LLC, were fitted to the radii before and after additional contouring along with standard industry plates designed by DePuy Synthes. Gap measurements were taken at various points along the plate, and bending times were recorded for the plates that were additionally contoured. This analysis was then repeated virtually as well as physically through use of 3D printed duplicates of the radii. The dorsal precontoured Acumed and Synthes plates were found to fit equally well to the radius, while the volar precontoured Acumed plate does not fit as well as the Synthes plate. Additionally bending both the dorsal and volar Acumed plates provides superior fit over the Synthes plate. Also, no significant differences were found between the measurements of the bone and 3D printed bone, meaning 3D printed bone could be a useful facsimile of real bone for use in surgical planning.M.S., Mechanical Engineering and Mechanics -- Drexel University, 202
Beproeving van gaffel verbindingen voor ronde buisprofielen
No full textCivil Engineering and GeosciencesStructural Engineerin
In-situ thermoelectric temperature monitoring and “Closed-loop integrated control” system for concentrator photovoltaic-thermoelectric hybrid receivers
No full textThis work demonstrates a new technique that capitalizes on the inherent flexibility of the thermoelectric module to provide a multifunctional platform, and exhibits a unique advantage only available within CPV-TE hybrid architectures. This system is the first to use the thermoelectric itself for hot-side temperature feedback to a PID control system, needing no additional thermocouple or thermistor to be attached to the cell - eliminating shading, and complex mechanical designs for mounting. Temperature measurement accuracy and thermoelectric active cooling functionality is preserved. Dynamic “per-cell” condition monitoring and protection is feasible using this technique, with direct cell-specific temperature measurement accurate to 1°C demonstrated over the entire experimental range. The extrapolation accuracy potential of the technique was also evaluated
De trekzijde van hoge balk-kolomverbindingen waarbij de boutafstand zo gering mogelijk is gekozen
No full textCivil Engineering and GeosciencesStructural Engineerin
The communicative approach to language learning - Meeting stakeholder expectations
No full textTeaching and Learning Department Capstone ProjectAn increasingly global economy and multicultural society are affecting our everyday lives, and it is important that we adapt to the changes that accompany such growth. One of the most prevalent and public challenges we deal with is the language, or perhaps languages, with which we conduct our day-to-day affairs. This paper discusses the current status of foreign language teaching in the United States and the need to improve what the education system is currently offering. The author of this paper compares the Grammar-Translation Method to the Communicative Method, arguing that the latter of the two better meets student expectations and national standards created under the No Child Left Behind Act of 2001. Both curricular approaches are explained in detail, bringing to light the advantages and disadvantages of each. The Communicative Method does not exclude learning grammar. In fact, a communicative classroom may follow a grammatical syllabus. The advantage is the added focus on finding meaning and use in the language. The author addresses how national standards are met and how students can be effectively assessed according to the Communicative Method. Student attitude and motivation are discussed in terms of being a positive influence in a communicative setting, yet a negative influence in the Grammar-Translation classroom. The author provides suggestions on how instructional methods and materials can change to provide a better communicative learning experience both in and out of the classroom. Textbooks, computer technology and communicative activities are each discussed. The author also makes a point of addressing how the learning environment extends beyond the classroom and beyond secondary education. At the same time, opportunities available in schools should be offered in earlier years. The paper is clear in its purpose: successful foreign language classrooms put an emphasis on communication in the target language.Peabody College of Education and Human DevelopmentDepartment of Teaching and Learnin
The effective width of branch plate to RHS chord connections in cross joints
No full textCivil Engineering and GeosciencesStructural Engineerin
The effective width of branch crosswalls for RR joints in tension
No full textCivil Engineering and GeosciencesStructural Engineerin
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