2,622 research outputs found
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
Roughness Induced Boundary Layer Transition in Incompressible Flow
No full textThe fluid dynamics process leading to laminar-turbulent transition behind an isolated roughness element is investigated in the incompressible regime using particle image velocimetry. The study covers the effect of roughness size and geometry on the promotion of transition. The measurement domain covers a large streamwise range from the near wake to the onset of the turbulent regime. Planar PIV measurements reveal the basic flow pattern and the turbulent structure of the flow characterizing by the velocity fluctuation statistics (RMS of the streamwise and wall-normal velocity component and Reynolds shear stress). The high Reynolds shear stress level reaching the region near the wall in the downstream area indicates the onset of turbulent boundary layer
Keterampilan Hukum, Panduan untuk Mahasiswa, Akademisi dan Praktisi
No full textSkills book for Indonesian students and lawyers in Indonesian, based on the skills method of the Faculty of Law of Maastricht University. Each chapter has been written by a different author, but the overall structure is based on the structure of Vaardigheden voor juristen
Dr. Houston Peterson Prof. PHIL. F.J. Higgins Highland Park, N.J. No. 1943-C
No full textPortrait of Dr. Houston Peterson, Professor of Philosophy, Rutgers State University; former Head of Cooper Union's Division of Social Philosophy; addressed the Convocation Student Assembly on the topic of "Peter Cooper's Dream," October 8, 1956 in the Great Hall.image/tif; 100-175 Dr Houston Peterson.tif; 13,594,706 bytesHP Scanjet 8300; 600ppi; 8-bit grayscaleMitsuko Brook
Goda Karte
No full textStamoed certificate which reads; Edmonton Latvian Society Imanta. F.J. Baker1.0 Imanta, 1.1.1 Historyof Imanta in Albert
Agglomeration in suspension: A study of mechanisms and kinetics
No full textMechanical, Maritime and Materials Engineerin
High-resolution EM-CCD scintillation gamma cameras
No full textThe development of medical imaging techniques has dramatically changed clinical practice and biomedical science in the 20th century. Nuclear Medicine imaging techniques reveal the function of organs and tissues in vivo with the aid of radioactively labeled tracer molecules. These techniques, such as Single Photon Emission Computed Tomography (SPECT) and Positron Emission Tomography (PET), are clinically applied in the fields of neurology, oncology, cardiology, skeletal and thyroid imaging. Applied to small animals, these techniques are important tools in development of better diagnostics and new drugs and fundamental biological research. For small animal SPECT systems, pinhole magnification enables image resolutions below 0.3 mm using conventional Anger cameras with an intrinsic spatial resolution of only 3 to 4 mm. There is a large desire to improve the spatial resolution of the gamma detectors to further improve the preclinical and clinical SPECT performance as well as to make systems more compact. This thesis focuses on EM-CCD based scintillation gamma cameras with a very high spatial resolution, more than 10 times better than conventional Anger cameras. Therefore these EM-CCD gamma cameras are a candidate for the next generation of pre-clinical-SPECT scanners. In pinhole SPECT cameras the spatial resolution is severely degraded for gamma photons incident at an angle, called the depth-of-interaction effect. We showed that this effect can be overcome using a novel curved scintillator geometry which results in a scintillation light centroid independent of the depth-of-interaction. Alternatively we strongly reduced the depth-of-interaction effect by using a multi scale algorithm that detects the scintillation depth. This depth is determined by modelling the variation of the scintillation light spread with depth. If we also take the statistics of the detector into account using a Maximum Likelihood scintillation detection algorithm the energy resolution of the detector improves significantly. Furthermore, using the Cramer Rao lower bound we showed that the EM-CCD based gamma camera performance is very sensitive to the scintillator light yield and the Clock Induced Charge (CIC) and dark current noise. A feasible reduction of these noise sources would improve the gamma camera performance significantly.RRRApplied Science
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