196,267 research outputs found
Possibilities and results of (free) vascularized bone graft of the hand and wrist
No full textThe vascularized bone transplantation or graft is a modern and successful treatment concept in segmental bone loss. Faster healing and higher union rates were shown in several studies. Using vascularized bone grafts, the adaption in mechanical conditions as well as stability are improved. The indications, however, must be critically considered in order to obtain an optimal result. Reconstruction of the bone defect should be performed as quickly as possible after the trauma, infection, or tumor resection. Amputation should always remain the method of last choice. Depending on the existing bone defect, there are various possible donor sites, e.g., fibula, scapula, ulna, femur, and hip bone. The advantages and disadvantages of each donor site has to be thoroughly discussed prior to the operation to assure an optimal postoperative result. In view of these issues, vascularized bone grafts should be performed in microvascular specialized plastic or hand surgery centers. © 2011 Springer
Groups of Prime-Power Order With a Small Number of Relations
No full textthis paper are: 142 Newman, Sauerbier, Wisliceny For every prime p there is a pro-p-presentation with 5 generators and 7 relations which defines a finite pro-p-group with generator number 5. (Theorem 4.2 and Remark 4.3
Virtual flight over the Palpa geoglyps and geoglyph database
No full textFrom 1999 to 2004, 639 Nasca geoglyphs near Palpa, south Peru, were recorded in the framework of the PhD project of Karsten Lambers. Aided by Martin Sauerbier, he created a database containing detailed descriptions of all geoglyphs and produced a virtual flight over the geoglyphs.The PhD project was part of the Nasca-Palpa Archaeological Project directed by Markus Reindel (DAI-KAAK, Bonn) and Johny Isla (INDEA, Lima). This project studied the societies of Paracas and Nasca in the northern part of the Nasca basin in south Peru from a variety of perspectives and from the Pacific coast up to the Andean highlands. Apart from a regional settlement survey and excavations at important sites dating from all pre-hispanic periods, the study of the geoglyphs was a key part of the project. In collaboration with Armin Gruen (ETH Zurich), the geoglyphs were photogrammetrically recorded and modelled in 3D, as a basis for their archaeological documentation and analysis. This resulted in the first comprehensive database of geoglyphs of a sub-region of the Nasca basin and shed new light on the origin, development, and social and cultural significance of the geoglyph phenomenon over time.Digital Archaeolog
Wood Protection through Plasma Powder Deposition—An Alternative Coating Process
No full textIn contrast to conventional coating processes such as varnishing, plasma powder deposition by means of an atmospheric pressure plasma jet on wood is not yet widely used. A key advantage of this process is that volatile organic compounds and organic solvents are avoided. In the present work, European beech (Fagus sylvatica L.) and pine sapwood (Pinus sylvestris L.) were coated with polymer (polyester), metal (aluminum coated silver) or metal oxide (bismuth oxide) particles. Furthermore, a layer system consisting of polyester and metal or metal oxide was investigated. The layer thickness and topography were analyzed with a laser scanning microscope and scanning electron microscope, revealing thicknesses of 2–22 µm depending on the coating material. In general, the chemical composition of the layers was determined using X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy measurements. The coatings consisting of metal and metal oxide showed a band gap and plasmon resonance in the range of 540 and 450 nm. Through this absorption, the wood may be protected against ultraviolet (UV) radiation. In the water uptake and release tests, the polyester layers exhibited a reduction of water vapor absorption after 24 h in 100% relative humidity (RH) by 53%–66%, whereas the pure metal oxide layers indicated the best desorption performance. The combination of metal oxide and polyester in the one-layer system combines the protection properties of the single coatings against water vapor and UV radiation
Vascularized bone grafts for upper limb reconstruction: Defects at the distal radius, wrist, and hand
No full textVascularized bone grafts have been successfully applied for the reconstruction of bone defects at the forearm, distal radius, carpus, and hand. Vascularized bone grafts are most commonly used in revision cases in which other approaches have failed. Vascularized bone grafts can be obtained from a variety of donor sites, including the fibula, the iliac crest, the distal radius (corticocancellous segments and vascularized periosteum), the metacarpals and metatarsals, and the medial femoral condyle (corticoperiosteal flaps). Their vascularity is preserved as either pedicled autografts or free flaps to carry the optimum biological potential to enhance union. The grafts can also be transferred as composite tissue flaps to reconstruct compound tissue defects. Selection of the most appropriate donor flap site is multifactorial. Considerations include size matching between donor and defect, the structural characteristics of the graft, the mechanical demands of the defect, proximity to the donor area, the need for an anastomosis, the duration of the procedure, and the donor site morbidity. This article focuses on defects of the distal radius, the wrist, and the hand. © 2010 Published by Elsevier Inc. on behalf of the American Society for Surgery of the Hand
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
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