102,766 research outputs found
Redox-Active Metal Oxides
No full textDr. Raptis obtained his Ph.D in Inorganic Chemistry from Texas A & M University. His research is focused on the synthesis of novel metal complexes with unusual topologies, electron transfer and magnetic properties. The synthesis and study of a new class of iron-based MRI contrast agents has been a major theme of his recent work. The study of porous metal-organic frameworks (MOFs) for the selective sorption of gases is a new direction currently pursued by Dr. Raptis’ laboratory. Susana Herrera (Logesh Mathivathanan, Raphael G, Raptis) “Bio-inspired Dinuclear Copper Oxygenation Catalysts: Synthesis, Characterization, and Reactivity Studies” Zimarayn Urdaneta (D.I. Kreiger, Raphael G. Raptis) “Studies Toward Copper Pyrazolate Based Water Oxidation” Raphael G. Raptis (Raphael G. Raptis) “Redox-Active Metal Oxides
A Remark on Configuration Spaces of Two Points
No full textWe prove a homotopy invariance result for a certain covering space of the space of ordered configurations of two points in M x X where M is a closed smooth manifold and X is any fixed aspherical space which is not a point
In situ micro- and macro-Raman investigation of the redox couple behavior in DSSCS
No full textAbstract not availableA.G. Kontos, T. Stergiopoulos, G. Tsiminis, Y.S. Raptis, P. Falara
'Trash Foot' following operations involving the abdominal aorta
No full text Background: Acute lower limb ischaemia following aortic surgery is commonly termed ‘trash foot’. The exact cause of the ischaemia is unknown, but it has been attributed to athero‐emboli from native arteries, thrombo‐emboli from any prosthetic graft or thrombosis of small vessels in the distal arterial tree. Methods: Review of 1601 aortic reconstructions performed between 1976 and 1995. Results: ‘Trash foot’ occurred in 32 patients (44 limbs): 23 cases followed aortic aneurysm repair and nine cases followed an aorto‐femoral bypass for occlusive disease. Six cases of ‘trash foot’ (13.6%) underwent an early amputation (one above‐knee, two below‐knee and three cases of amputation of one or more toes) while a further nine cases (20.5%) underwent a delayed amputation (four above the knee, two below the knee and three cases of toe amputation). Eight patients (25%) with ‘trash foot’ died within 30 days of surgery. Conclusion: ‘Trash foot’ following aortic surgery is an unwelcome complication that is associated with a high morbidity and mortality. Attempts to reduce the incidence involve early mobilization and clamping of the iliac arteries, and irrigation of the aortic anastomosis and graft with heparin saline solution.Kuhan, G. ; Raptis, S
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
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
Guest Editorial: 26th IEEE symposium on computers and communications (ISCC 2021) selected papers
No full textRain rate and radon daughters’ activity
No full textDuring a precipitation a transient increase of gamma activity is generated by 214Pb and 214Bi, daughters of atmospheric 222Rn, which are collected by rain droplets and brought to the ground. A continuous monitoring of this gamma radiation can be an efficient alternative to a 222Rn direct measurement in clouds and allows for estimating rain-induced variations in environmental gamma radiation. This work presents the results of a seven months proximal gamma-ray spectroscopy experiment, specifically tailored for gathering reliable and unbiased estimates of atmospheric 214Pb gamma activity related to rainfalls. We developed a reproducible model for reconstructing the temporal evolution of the 214Pb net count rate during rain episodes as function of the rain rate. The effectiveness of the model is proved by an excellent linear correlation (r2 = 0.91) between measured and estimated 214Pb count rates. We observed that the sudden increase of 214Pb count rates (ΔC) is clearly related to the rain rate (R) by a power law dependence ΔC∝R0.50±0.03. We assessed that the radon daughter 214Pb content (G) of the rain water depends on the rain rate with G∝1/R0.48±0.03 and on the rain median volume diameter (λm) with G∝1/λm2.2. We proved that, for a fixed rainfall amount, lower is the rainfall intensity (i.e. the longer is the rain duration), higher is the radon daughters’ content of the rain water
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