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Search Results: 1 - 10 of 10009 matches for " Kotlyar Simon "
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Recommendations for control of East African sleeping sickness in Uganda
Kotlyar Simon
Journal of Global Infectious Diseases , 2010,
Abstract: East African sleeping sickness, caused by Trypanosoma brucei rhodesiense, is prominent in Uganda and poses a serious public health challenge in the region. This publication attempts to provide key components for designing a strategy for a nationwide initiative to provide insecticide-treatment of the animal reservoir to control T. b. rhodesiense. The contents of this article will focus on insecticide-based vector control strategies, monitoring and evaluation framework, and knowledge gaps required for future initiatives.
The Influence of Team Demographic Composition on Individual Helping Behavior  [PDF]
Igor Kotlyar, Leonard Karakowsky
Psychology (PSYCH) , 2012, DOI: 10.4236/psych.2012.312152
Abstract: The aim of our laboratory study was to examine how the demographic composition (in terms of gender and culture) of work teams can influence levels of helping behavior demonstrated among group members. Participants included 216 university students from undergraduate business programs in two large North American universities (108 men, 108 women) who were randomly assigned to small groups for the purpose of engaging in business case discussions. Discussions were videotaped in order to observe helping behavior among individuals. Our findings indicated that the numerical minority member (measured in terms of gender or ethnicity) was less likely to engage in the helping activity. These findings suggest that the effects of numerical minority status are not confined to task-performance related behaviors like participation and emergent leadership, but also influence behaviors that involve how members relate to one and other, and whether they engage in helping behavior.
Tensor and Operator Forms of 3He and 3H Wave Functions for Parity-Violating Nuclear Forces
V. Kotlyar
Physics , 2007,
Abstract: Tensor representation (TR) for wave function (WF) of three-nucleon bound state with the total angular momentum I=1/2 is discussed. The WF in TR has 16 complex components depending on vectors of relative momenta. Constraints on the WF imposed by requirements of invariance with respect to space inversion and time reversal are studied. Both parity-even and parity-odd components of the 3N bound state are constructed using 16 scalar functions. The arguments of the functions are magnitudes of relative momenta and scalar product of the momenta. With nuclear forces being time-reversal invariant these functions are real. The WF in TR is converted into an operator form, accounting for parity violating contributions. Properties of operator representations for WFs of 2N and 3N nuclei are compared.
Social and psychological climate of educational institution as a measure of consistency of leadership style and type of organizational culture
M.L. Kotlyar
Psihologi?eskaa Nauka i Obrazovanie , 2013,
Abstract: We describe process and results of a study conducted on the basis of state educational institutions of Moscow (a secondary school and a school with advanced study of foreign languages). We demonstrate the possibility of using the analysis of social and psychological environment as an indicator of leadership style consistency and type of organizational culture of educational institution. We revealed an educational trend that the real organizational culture with a predominance of one type of its elements, the desired profile will tend to the mixed type. We mapped out a plan for further research on the topic.
Persistent Current in an Artificial Quantum Dot Molecule
R. Kotlyar,S. Das Sarma
Physics , 1996, DOI: 10.1103/PhysRevB.55.R10205
Abstract: Using an exact diagonalization technique within a generalized Mott-Hubbard Hamiltonian, we predict the existence of a ground state persistent current in coherent two-dimensional semiconductor quantum dot arrays pierced by an external magnetic flux. The calculated persistent current, which arises from the nontrivial dependence of the ground state energy on the external flux, exists in isolated arrays without any periodic boundary condition. The sensitivity of the calculated persistent current to interaction and disorder is shown to reflect the intricacies of various Anderson-Mott-Hubbard quantum phase transitions in two dimensional systems.
Nonlinear Transport through Coupled Double Quantum Dot Systems
R. Kotlyar,S. Das Sarma
Physics , 1996, DOI: 10.1103/PhysRevB.56.13235
Abstract: We investigate sequential tunneling transport through a semiconductor double quantum dot structure by combining a simple microscopic quantum confinement model with a Mott-Hubbard type correlation model. We calculate nonperturbatively the evolution of the Coulomb blockade oscillations as a function of the interdot barrier conductance, obtaining good qualitative agreement with the experimental data over the whole tunneling regime from the weak-coupling individual dot to the strong-coupling coherent double-dot molecular system.
Disorder and Interaction in 2D: Exact diagonalization study of the Anderson-Hubbard-Mott model
R. Kotlyar,S. Das Sarma
Physics , 2000, DOI: 10.1103/PhysRevLett.86.2388
Abstract: We investigate, by numerically calculating the charge stiffness, the effects of random diagonal disorder and electron-electron interaction on the nature of the ground state in the 2D Hubbard model through the finite size exact diagonalization technique. By comparing with the corresponding 1D Hubbard model results and by using heuristic arguments we conclude that it is \QTR{it}{unlikely} that there is a 2D metal-insulator quantum phase transition although the effect of interaction in some range of parameters is to substantially enhance the non-interacting charge stiffness.
Primary Graft Failure after Heart Transplantation
Arjun Iyer,Gayathri Kumarasinghe,Mark Hicks,Alasdair Watson,Ling Gao,Aoife Doyle,Anne Keogh,Eugene Kotlyar,Christopher Hayward,Kumud Dhital,Emily Granger,Paul Jansz,Roger Pye,Phillip Spratt,Peter Simon Macdonald
Journal of Transplantation , 2011, DOI: 10.1155/2011/175768
Abstract: Primary graft failure (PGF) is a devastating complication that occurs in the immediate postoperative period following heart transplantation. It manifests as severe ventricular dysfunction of the donor graft and carries significant mortality and morbidity. In the last decade, advances in pharmacological treatment and mechanical circulatory support have improved the outlook for heart transplant recipients who develop this complication. Despite these advances in treatment, PGF is still the leading cause of death in the first 30 days after transplantation. In today's climate of significant organ shortages and growing waiting lists, transplant units worldwide have increasingly utilised “marginal donors” to try and bridge the gap between “supply and demand.” One of the costs of this strategy has been an increased incidence of PGF. As the threat of PGF increases, the challenges of predicting and preventing its occurrence, as well as the identification of more effective treatment modalities, are vital areas of active research and development.
Primary Graft Failure after Heart Transplantation
Arjun Iyer,Gayathri Kumarasinghe,Mark Hicks,Alasdair Watson,Ling Gao,Aoife Doyle,Anne Keogh,Eugene Kotlyar,Christopher Hayward,Kumud Dhital,Emily Granger,Paul Jansz,Roger Pye,Phillip Spratt,Peter Simon Macdonald
Journal of Transplantation , 2011, DOI: 10.1155/2011/175768
Abstract: Primary graft failure (PGF) is a devastating complication that occurs in the immediate postoperative period following heart transplantation. It manifests as severe ventricular dysfunction of the donor graft and carries significant mortality and morbidity. In the last decade, advances in pharmacological treatment and mechanical circulatory support have improved the outlook for heart transplant recipients who develop this complication. Despite these advances in treatment, PGF is still the leading cause of death in the first 30 days after transplantation. In today's climate of significant organ shortages and growing waiting lists, transplant units worldwide have increasingly utilised “marginal donors” to try and bridge the gap between “supply and demand.” One of the costs of this strategy has been an increased incidence of PGF. As the threat of PGF increases, the challenges of predicting and preventing its occurrence, as well as the identification of more effective treatment modalities, are vital areas of active research and development. 1. Introduction Heart transplantation is an effective method of treatment for end-stage heart failure, with more than 5,000 transplants being conducted each year in over 300 countries [1]. The survival rate after heart transplantation has improved steadily over the last two decades with virtually all of the improvement being in survival during the first few months [1]. Despite this improvement in early post-transplant survival, there is little if any evidence that deaths due to primary graft failure (PGF) have decreased over this period. In a large retrospective study of 7,259 heart transplant recipients during the decade from 1990 to 2000, Young and colleagues reported that the one month mortality after heart transplantation was 6.9% with 43% of these deaths due to PGF [2]. This compares with the most recent audit of the International Society of Heart and Lung Transplantation Registry which reported a one month mortality after transplantation of 8% with 39% of these deaths resulting from PGF [1]. It is clear from these data that PGF continues to be the single most common cause of death within the first month after heart transplantation [1]. In addition, the high morbidity associated with PGF and its treatment is likely to be a major contributor to deaths that are attributed to other causes such as infection and rejection over subsequent months. 2. Incidence The reported incidence of PGF after heart transplantation varies widely between studies with estimates ranging between 2.3 and 26% [3–11]. Most of the variability can
Elongated Photonic Nanojet from Truncated Cylindrical Zone Plate
Sergey S. Stafeev,Victor V. Kotlyar
Journal of Atomic, Molecular, and Optical Physics , 2012, DOI: 10.1155/2012/123872
Abstract: Previously (Chen et al., 2004), it was shown that dielectric cylinder can form focal spots with small diameters and long depth. This type of focal spot was called photonic nanojet. In this paper, it was shown that dielectric cylinder of radius 595 nm (1.12 of wavelength) forms near the surface a photonic nanojet with diameter equal to 0.31 of wavelength and depth of focus equal to 0.57 of wavelength. Adding truncated concentric rings with radiuses equal to radiuses of zone plate to the cylinder increases the depth of focus to 1.18 of the wavelength. The diameter and intensity of focal spot near the cylinder surface remain unchanged.
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