Polarization Effects in Chargino Production at High Energy γγ\gamma\gamma Colliders

We investigate the chargino production process $\gamma\gamma\rightarrow\tilde{W}^{+}\tilde{W}^{-}$ at high energy $\gamma\gamma$ colliders in the framework of the minimal supersymmetric standard model (MSSM). Here the high energy $\gamma$ beams are obtained by the backward Compton scattering of the laser flush by the electron in the basic linear TeV $ee$ colliders. We consider the polarization of the laser photons as well as the electron beams. Appropriate beam polarization could be effective to enhance the cross section and for us to extract the signal from the dominant background $\gamma\gamma\rightarrow{W}^{+}{W}^{-}$.Comment: 7 pages, latex , 3 figures are available upon reques

Discrimination of SUSY breaking models using single-photon processes at future e+e- linear colliders

We examine the single-photon processes in the frame work of supersymmetric models at future e+e- linear colliders. According to the recent experimental achievement, the optimistic polarization degrees for both electron and positron beams are taken into account to enhance the signal-to-noise ratio revealing the observable difference between supersymmetry breaking models. The minimal supergravity model and the minimal SU(5) grand unified model in gaugino mediation have been examined as examples. We see that after several years of accummulating data, the difference of the number of single-photon events between the two models received from the collider would be in excess of three times the statistical error, providing us the possibility to probe which model would be realized in nature. The result is well suitable for the future running of the International Linear Collider.Comment: 14 pages, 4 figures, version to be published in Mod. Phys. Lett.

Novel nano-composite multi-layered biomaterial for the treatment of multifocal degenerative cartilage lesions

We report on a 46-year-old athletic patient, previously treated with anterior cruciate ligament reconstruction, with large degenerative chondral lesions of the medial femoral condyle, trochlea and patella, which was successfully treated with a closing-wedge high tibial osteotomy and the implant of a newly developed biomimetic nanostructured osteochondral bioactive scaffold. After 1 year of follow-up the patient was pain-free, had full knee range of motion, and had returned to his pre-operation level of athletic activity. MRI evaluation at 6 months showed that the implant gave a hyaline-like signal as well as a good restoration of the articular surface, with minimal subchondral bone oedema. Subchondral oedema was almost non-visible at 12 months

One-Parameter Squeezed Gaussian States of Time-Dependent Harmonic Oscillator and Selection Rule for Vacuum States

By using the invariant method we find one-parameter squeezed Gaussian states for both time-independent and time-dependent oscillators. The squeezing parameter is expressed in terms of energy expectation value for time-independent case and represents the degree of mixing positive and negative frequency solutions for time-dependent case. A {\it minimum uncertainty proposal} is advanced to select uniquely vacuum states at each moment of time. We show that the Gaussian states with minimum uncertainty coincide with the true vacuum state for time-independent oscillator and the Bunch-Davies vacuum for a massive scalar field in a de Sitter spacetime.Comment: 13 Pages, ReVTeX, no figure

Medicinal leeches and the microsurgeon: A four-year study, clinical series and risk benefit review

Background: There are case reports and small series in the literature relating to the use of medicinal leeches by plastic surgeons; however, larger series from individual units are rare. The aim of this article is to present a comprehensive 4-year case series of the use of medicinal leeches, discuss the current evidence regarding indications, risks, and benefits and highlight the recent updates regarding leech speciation. Methods: Patients prescribed leeches in a 4-year period (July 2004–2008) were collated from hospital pharmacy records (N = 35). The number of leeches used, demographic, clinical, and microbiological details were retrospectively analyzed. Results: Thirty-five patients were treated with leeches. The age range was 2 to 98 years (mean = 49.3). Leeches were most commonly used for venous congestion in pedicled flaps and replantations. Blood transfusions were necessary in 12 cases (34%) [mean = 2.8 units, range 2–5 units]. Our infection rate was 20% (7/35) including five infections with Aeromonas spp. (14.2%). The proportion of patients becoming infected after leech therapy was significantly greater in the group of patients that did not receive prophylactic antibiotic treatment (Fisher's Exact test P = 0.0005). In total, 14 cases (40%) were salvaged in entirety, in 7 cases 80% or more, in 2 cases 50 to 79%, and in 1 case less than 50% of the tissues were salvaged. In 11 cases (31%), the tissues were totally lost. Conclusion: Our study highlights both the benefits and the risks to patients in selected clinical situations and also the potential risks. The routine use of antibiotic prophylaxis is supported. In view of the emerging evidence that Hirudo verbana are now used as standard leech therapy, and the primary pathogen is Aeromonas veronii, until a large prospective multicenter study is published, large series of patients treated with leeches should be reported. © 2011 Wiley-Liss, Inc. Microsurgery, 2011

Approaches development to formalized description of the disciplinary competence of testable component structure

The purpose of this paper is a development of approaches and recommendations on the selection of quantitative and qualitative component structure of disciplinary competencies, as well as ways of its formal description. One of the main problems, which it is necessary to decide while developing a studying and methodical discipline complex (for example, a discipline program, a fund of estimation tools, etc.) of competence-oriented educational program, is designing of a component structure of each part of competence (a disciplinary competence), that is involved in the formation of the discipline. In this case, a significant impact on this process has not only the content of thematic plan and selected kinds of class and self works of students, but proposed control tools and diagnosing methods of learning outcomes specified in the competency format. Methods. It is proposed to use joint (testable) design component structure of disciplinary competencies and control tools (tests, test materials), check the level of development of their constituent elements described in the triad of «to know», «to be able to», «to master». Requirements to the basic quantitative and qualitative properties of disciplinary competence component structure are formulated and substantiated. A structure of diagnostic table that makes it possible to set a correspondence between disciplinary competence elements and components and their control tests, and also to fix outcomes of current control of development level (test reactions in the binary and not binary alphabets) is proposed and analyzed. A classification of diagnostic tests is given; their impact on format and properties of diagnostic table is shown. Scientific novelty. The approach to designing of a testable component structure of disciplinary competence is proposed; it allows setting some properties of control object, which can increase procedure effective and decoding precision of diagnosis of learning outcomes specified in the competency format. The sub product of using some methods of technical diagnosis for their application in the learning outcomes quality control on the competence-oriented educational programs is given. Practical significance. The research implications can be useful while designing of component structure with showing properties, and will allow teachers to make a test procedure more effectively and qualitatively; it is possible for student to estimate more adequately current level of training that is most significantly under a size and role of student self-work increase. The recommendations and guidelines for selection of a diagnostic table format may be used for designing disciplinary programs and estimating of tools funds in educational programs, wherein learning outcomes are specified in the competency format Цель работы – разработка подходов и рекомендаций для выбора количественных и качественных показателей компонентной структуры дисциплинарной компетенции, а также способов ее формализованного описания. Одной из основных задач, которую необходимо решать при создании учебно-методического комплекса дисциплины (ее рабочей программы, фонда оценочных средств и т. д.) и компетентностно-ориентированной образовательной программы, является проектирование компонентной структуры каждой части компетенции (дисциплинарных компетенций). Существенное влияние на данный процесс оказывают не только содержание тематического плана и выбранные виды аудиторной и самостоятельной работы, но и планируемые средства контроля и методы диагностирования результатов обучения, заданных в компетентностном формате. Методы и результаты работы. Предлагается совместное (контролепригодное) проектирование компонентной структуры дисциплинарных компетенций и средств контроля (тестов, контрольно-измерительных материалов), проверяющих уровень освоения их составных элементов, сформулированных в триаде «знать», «уметь», «владеть». Обосновываются требования к основным количественным и качественным показателям компонентной структуры дисциплинарной компетенции. Разработана и проанализирована структура таблицы диагностирования, позволяющая установить соответствие между компонентами дисциплинарных компетенций и контролирующими их тестами, а также зафиксировать результаты текущего контроля уровня освоения. Дана классификация диагностических тестов, показано их влияние на формат и параметры таблицы диагностирования. Научная новизна. Описан подход к формированию контролепригодной компонентной структуры дисциплинарной компетенции, позволяющий придать объекту контроля свойства, повышающие эффективность процедуры и точность дешифрации диагностирования результатов обучения. Представлены частные результаты применения некоторых положений аппарата и методов технической диагностики для их использования в области измерения качества результатов обучения в рамках компетентностно-ориентированных образовательных программ. Практическая значимость. Построение контролепригодной компонентной структуры дисциплинарной компетенции дает возможность педагогу более качественно проводить проверку знаний, а студенту – более адекватно оценивать свои достижения, что особенно важно при увеличении объема самостоятельной работы. Рекомендации по выбору формата таблицы диагностирования могут быть использованы при проектировании рабочих программ и фондов оценочных средств по дисциплинам и разделам образовательных программ, в которых результаты обучения представлены в компетентностном формате

Social representations of HIV/AIDS in five Central European and Eastern European countries: A multidimensional analysis

Cognitive processing models of risky sexual behaviour have proliferated in the two decades since the first reporting of HIV/AIDS, but far less attention has been paid to individual and group representations of the epidemic and the relationship between these representations and reported sexual behaviours. In this study, 494 business people and medics from Estonia, Georgia, Hungary, Poland and Russia sorted free associations around HIV/AIDS in a matrix completion task. Exploratory factor and multidimensional scaling analyses revealed two main dimensions (labelled ‘Sex’ and ‘Deadly disease’), with significant cultural and gender variations along both dimension scores. Possible explanations for these results are discussed in the light of growing concerns over the spread of the epidemic in this region

Much Ado About Leptoquarks: A Comprehensive Analysis

We examine the phenomenological implications of a 200 GeV leptoquark in light of the recent excess of events at HERA. Given the relative predictions of events rates in e^+p versus e^-p, we demonstrate that classes of leptoquarks may be excluded, including those contained in E_6 GUT models. It is shown that future studies with polarized beams at HERA could reveal the chirality of the leptoquark fermionic coupling and that given sufficient luminosity in each e^\pm_{L,R} channel the leptoquark quantum numbers could be determined. The implications of 200-220 GeV leptoquarks at the Tevatron are examined. While present Tevatron data most likely excludes vector leptoquarks and leptogluons in this mass region, it does allow for scalar leptoquarks. We find that while leptoquarks have little influence on Drell-Yan production, further studies at the Main Injector are possible in the single production channel. We investigate precision electroweak measurements as well as the process e^+e^-\to q\bar q at LEP II and find they provide no further restrictions on these leptoquark models. We then ascertain that cross section and polarization asymmetry measurements at the NLC provide the only direct mechanism to determine the leptoquark's electroweak quantum numbers. The single production of leptoquarks in \gamma e collisions by both the backscattered laser and Weisacker-Williams techniques at the NLC is also discussed. Finally, we demonstrate that we can obtain successful coupling constant unification in models with leptoquarks, both with or without supersymmetry. The supersymmetric case requires the GUT group to be larger than SU(5) such as flipped SU(5)\times U(1)_X.Comment: Corrected single production cross section at Tevatron, updated atomic parity violation constraints, 55 page