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Search Results: 1 - 10 of 344805 matches for " D. G. Rudik "
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Electrophysical propertis of solid solutions of Zn2–x(TiaZrb)1–xFe2xО4  [PDF]
Rudik Hamazaspi Grigoryan, Levoh Hamazaspi Grigoryan
Open Journal of Inorganic Chemistry (OJIC) , 2012, DOI: 10.4236/ojic.2012.24013
Abstract: Electrophysical properties of multicomponent system Zn2TiO4–Zn2ZrO4–ZnFe2O4 were investigated. The electrical conductivity, band gap, dielectric permittivity, and molar polarizability of formed solid solutions –Zn2-x(TiaZrb)1-xFe2xO4 (x = 0 - 1.0 are defined; Δх = 0.05; a + b = 1; a:b = 1:5; 1:4; 1:3; 1:2; 1:1; 2:1; 3:1; 4:1) were defined. Electrophysical properties of samples are in linear dependence on their composition. All the synthesized samples are semiconductors with high electrical resistivity. Was confirmed the formation of two phases of variable composition with a wide homogeneity range.
Experimental study of ionization yield of liquid xenon for electron recoils in the energy range 2.8 - 80 keV
D. Yu. Akimov,V. V. Afanasyev,I. S. Alexandrov,V. A. Belov,A. I. Bolozdynya,A. A. Burenkov,Yu. V. Efremenko,D. A. Egorov,A. V. Etenko,M. A. Gulin,S. V. Ivakhin,V. A. Kaplin,A. K. Karelin,A. V. Khromov,M. A. Kirsanov,S. G. Klimanov,A. S. Kobyakin,A. M. Konovalov,A. G. Kovalenko,A. V. Kuchenkov,A. V. Kumpan,Yu. A. Melikyan,R. I. Nikolaev,D. G. Rudik,V. V. Sosnovtsev,V. N. Stekhanov
Physics , 2014, DOI: 10.1088/1748-0221/9/11/P11014
Abstract: We present the results of the first experimental study of ionization yield of electron recoils with energies below 100 keV produced in liquid xenon by the isotopes: 37Ar, 83mKr, 241Am, 129Xe, 131Xe. It is confirmed by a direct measurement with 37Ar isotope (2.82 keV) that the ionization yield is growing up with the energy decrease in the energy range below ~ 10 keV accordingly to the NEST predictions. Decay time of scintillation at 2.82 keV is measured to be 25 +/- 3 ns at the electric field of 3.75 kV/cm.
Perspectives to measure neutrino-nuclear neutral current coherent scattering with two-phase emission detector
RED Collaboration,D. Yu. Akimov,I. S. Alexandrov,V. I. Aleshin,V. A. Belov,A. I. Bolozdynya,A. A. Burenkov,A. S. Chepurnov,M. V. Danilov,A. V. Derbin,V. V. Dmitrenko,A. G. Dolgolenko,D. A. Egorov,Yu. V. Efremenko,A. V. Etenko,M. B. Gromov,M. A. Gulin,S. V. Ivakhin,V. A. Kantserov,V. A. Kaplin,A. K. Karelin,A. V. Khromov,M. A. Kirsanov,S. G. Klimanov,A. S. Kobyakin,A. M. Konovalov,A. G. Kovalenko,V. I. Kopeikin,T. D. Krakhmalova,A. V. Kuchenkov,A. V. Kumpan,E. A. Litvinovich,G. A Lukyanchenko,I. N. Machulin,V. P. Martemyanov,N. N. Nurakhov,D. G. Rudik,I. S. Saldikov,M. D. Skorokhatov,V. V. Sosnovtsev,V. N. Stekhanov,M. N. Strikhanov,S. V. Sukhotin,V. G. Tarasenkov,G. V. Tikhomirov,O. Ya. Zeldovich
Physics , 2012, DOI: 10.1088/1748-0221/8/10/P10023
Abstract: We propose to detect and to study neutrino neutral current coherent scattering off atomic nuclei with a two-phase emission detector using liquid xenon as a working medium. Expected signals and backgrounds are calculated for two possible experimental sites: Kalinin Nuclear Power Plant in the Russian Federation and Spallation Neutron Source at the Oak Ridge National Laboratory in the USA. Both sites have advantages as well as limitations. However the experiment looks feasible at either location. Preliminary design of the detector and supporting R&D program are discussed.
The COHERENT Experiment at the Spallation Neutron Source
COHERENT Collaboration,D. Akimov,P. An,C. Awe,P. S. Barbeau,P. Barton,B. Becker,V. Below,A. Bolozdynya,A. Burenkov,B. Cabrera-Palmer,J. I. Collar,R. J. Cooper,R. L. Cooper,C. Cuesta,D. Dean,J. Detwiler,Y. Efremenko,S. R. Elliott,N. Fields,W. Fox,A. Galindo-Uribarri,M. Green,M. Heath,S. Hedges,N. Herman,D. Hornback,E. B. Iverson,L. Kaufman,S. R. Klein,A. Khromov,A. Konovalev,A. Kumpan,C. Leadbetter,L. Li,W. Lu,A. Melikyan,D. Markoff,K. Miller,M. Middlebrook,P. Mueller,P. Naumov,J. Newby,D. Parno,S. Penttila,G. Perumpilly,D. Radford,H. Ray,J. Raybern,D. Reyna,G. C. Rich,D. Rimal,D. Rudik,K. Scholberg,B. Scholz,W. M. Snow,A. Sosnovchev,A. Shakirov,S. Suchyta,B. Suh,R. Tayloe,R. T. Thornton,A. Tolstukhin,K. Vetter,C. H. Yu
Physics , 2015,
Abstract: The COHERENT collaboration's primary objective is to measure coherent elastic neutrino-nucleus scattering (CEvNS) using the unique, high-quality source of tens-of-MeV neutrinos provided by the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). In spite of its large cross section, the CEvNS process has never been observed, due to tiny energies of the resulting nuclear recoils which are out of reach for standard neutrino detectors. The measurement of CEvNS has now become feasible, thanks to the development of ultra-sensitive technology for rare decay and weakly-interacting massive particle (dark matter) searches. The CEvNS cross section is cleanly predicted in the standard model; hence its measurement provides a standard model test. It is relevant for supernova physics and supernova-neutrino detection, and enables validation of dark-matter detector background and detector-response models. In the long term, precision measurement of CEvNS will address questions of nuclear structure. COHERENT will deploy multiple detector technologies in a phased approach: a 14-kg CsI[Na] scintillating crystal, 15 kg of p-type point-contact germanium detectors, and 100 kg of liquid xenon in a two-phase time projection chamber. Following an extensive background measurement campaign, a location in the SNS basement has proven to be neutron-quiet and suitable for deployment of the COHERENT detector suite. The simultaneous deployment of the three COHERENT detector subsystems will test the $N^2$ dependence of the cross section and ensure an unambiguous discovery of CEvNS. This document describes concisely the COHERENT physics motivations, sensitivity and plans for measurements at the SNS to be accomplished on a four-year timescale.
Peculiarities of leaves morpho-anatomical parameters of Salvia L. species under the conditions of introduction
Galyna O. Rudik,Tatyana V. Multjan,Oksana V. Tyshchenko
Modern Phytomorphology , 2012,
Abstract: The comparison of morpho-anatomical parameters of the leaves of three Salvia L. species of different biomorphes, which are grown under the introduction in O.V. Fomin Botanical Garden, is considered. The morpho-anatomical features, which allow to discover structural adaptation possibilities of Salvia species ex situ , are established.
VIX and VIX Futures Pricing Algorithms: Cultivating Understanding  [PDF]
Hancock G. D’Anne
Modern Economy (ME) , 2012, DOI: 10.4236/me.2012.33038
Abstract: This article reviews the development of the S&P 500 volatility index and uses market information to develop algorithms which aid in clarifying some of the salient points in the determination of an index value. Understanding the pertinent points provides insight into the interpretation and limitations of the usefulness of the VIX and other VIX-type contracts.
A Working Classification of Retraction for the Whole Tympanic Membrane  [PDF]
G. D. Barr
International Journal of Otolaryngology and Head & Neck Surgery (IJOHNS) , 2013, DOI: 10.4236/ijohns.2013.24031

Objective: To formulate a reliable classification of tympanic membrane retraction which is easy to use but capable of detecting small differences in retraction. Study Design: Prospective study. Methods: The classification was developed from observations dividing the drum into 3 areas: the pars tensa anterior to the malleus, type I, posterior to the malleus (subdivided into upper and lower) type II, and attic type III. The subclassification on paper is more complicated but using a database it is easy to use. The classification is automatically calculated by the database which can also be converted to numerical form. The classification also allows documentation of active disease in retractions. Photographs of seven retracted ear drums were incorporated into the database and ten otolaryngologists asked to classify them. Five were asked to reclassify the retractions in the same way after 3 months. Results: Intra class correlation was significantly high (>0.9) for pars tensa, attic, and for bony erosion. Cronbach’s alpha values were also high (>0.9) in all groups. Retest values were evaluated with Wilcoxon’s signed rank sum test establishing that there was no significant difference in results. Conclusion: The classification shows reliabiliy and validity allowing detection of small changes in tympanic membrane retraction especially affecting the pars tensa but allows classification of the whole tympanic membrane.

Behind the Rejection of Alternative Measures of Implied Equity Volatility: A Note  [PDF]
G. D. Hancock
Journal of Financial Risk Management (JFRM) , 2013, DOI: 10.4236/jfrm.2013.21002

This note evaluates the risk-adjusted performance of the implied volatility of the NASDAQ index (VXN), Russell 2000 (RVX) and Dow Jones Industrial Averages (VXD). The results are compared to the performance of the implied volatility of the S & P 500 (VIX) in order to identify the unique contribution of each volatility index. Futures and option contracts have been offered on the VXD, VXN and RVX with results so dismal that the contracts were eventually delisted. In May 2012 futures were once again offered on the VXN but there is little market interest as indicated by the low trading volume. This note finds that the equity index implied volatility measures on VXN, RVX and VXD do not offer sufficient benefits beyond what investors can achieve with VIX which may explain, in part, the rejection of derivatives written on those measures of tradable implied index volatility.

Contrast Enhanced Magnetic Resonance Angiography with Gadofosveset Used in Detection and Localization of Bleeding  [PDF]
D. Durant, G. Annamalai
Open Journal of Radiology (OJRad) , 2014, DOI: 10.4236/ojrad.2014.41004

It has been established that internal hemorrhage can be detected and localized with noninvasive and minimally invasive imaging methods such as CT angiography, conventional angiography and nuclear scintigraphy. The use of steady-state MRI with the relatively new intravascular contrast agent gadofosveset offers the possibility of accurate anatomic localization of bleeding without the use of ionizing radiation or iodinated contrast media. To illustrate this assertion, we describe two cases from our institution in which MR angiography was successfully performed specifically for this indication.

Asymmetric Three-Phase Cascading Trinary-DC Source Multilevel Inverter Topologies for Variable Frequency PWM  [PDF]
G. Irusapparajan, D. Periyaazhagar
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.74043
Abstract: Asymmetric three-phase cascading Trinary-DC source Multilevel Inverter which can achieve reduced harmonics and superior root mean square (RMS) values of the output voltage is proposed. This topology can achieve cascaded full bridge inverter operation with dissimilar (unequal) DC Source and it is fired by using variable frequency pulse with modulation technique as a switching strategy. This pulse width modulation switching strategy has a newly adopted multicarrier single reference technique. The performance parameter factors like Form Factor (FF), Crest Factor (CF), Total Harmonic Distortion (THD) and fundamental RMS output voltage (VRMS) are estimated by using proposed asymmetrical three-phase cascading multilevel inverter for several modulation indices (0.8 - 1). The research study carries with MATLAB/SIMULINK based simulation and experimental results obtained using appropriate prototype (test board) to prove the viability of the proposed concept.
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