Electron transport and optical properties of shallow GaAs/InGaAs/GaAs quantum wells with a thin central AlAs barrier

Shallow GaAs/InGaAs/GaAs quantum well structures with and without a three monolayer thick AlAs central barrier have been investigated for different well widths and Si doping levels. The transport parameters are determined by resistivity measurements in the temperature range 4-300 K and magnetotransport in magnetic fields up to 12 T. The (subband) carrier concentrations and mobilities are extracted from the Hall data and Shubnikov-de Haas oscillations. We find that the transport parameters are strongly affected by the insertion of the AlAs central barrier. Photoluminescence spectra, measured at 77 K, show an increase of the transition energies upon insertion of the barrier. The transport and optical data are analyzed with help of self-consistent calculations of the subband structure and envelope wave functions. Insertion of the AlAs central barrier changes the spatial distribution of the electron wave functions and leads to the formation of hybrid states, i.e. states which extend over the InGaAs and the delta-doped layer quantum wells.Comment: 14 pages, pdf fil

Kronecker's Double Series and Exact Asymptotic Expansion for Free Models of Statistical Mechanics on Torus

For the free models of statistical mechanics on torus, exact asymptotic expansions of the free energy, the internal energy and the specific heat in the vicinity of the critical point are found. It is shown that there is direct relation between the terms of the expansion and the Kronecker's double series. The latter can be expressed in terms of the elliptic theta-functions in all orders of the asymptotic expansion.Comment: REVTeX, 22 pages, this is expanded version which includes exact asymptotic expansions of the free energy, the internal energy and the specific hea

Multifractality in Time Series

We apply the concepts of multifractal physics to financial time series in order to characterize the onset of crash for the Standard & Poor's 500 stock index x(t). It is found that within the framework of multifractality, the "analogous" specific heat of the S&P500 discrete price index displays a shoulder to the right of the main peak for low values of time lags. On decreasing T, the presence of the shoulder is a consequence of the peaked, temporal x(t+T)-x(t) fluctuations in this regime. For large time lags (T>80), we have found that C_{q} displays typical features of a classical phase transition at a critical point. An example of such dynamic phase transition in a simple economic model system, based on a mapping with multifractality phenomena in random multiplicative processes, is also presented by applying former results obtained with a continuous probability theory for describing scaling measures.Comment: 22 pages, Revtex, 4 ps figures - To appear J. Phys. A (2000

Decoherence produces coherent states: an explicit proof for harmonic chains

We study the behavior of infinite systems of coupled harmonic oscillators as t->infinity, and generalize the Central Limit Theorem (CLT) to show that their reduced Wigner distributions become Gaussian under quite general conditions. This shows that generalized coherent states tend to be produced naturally. A sufficient condition for this to happen is shown to be that the spectral function is analytic and nonlinear. For a rectangular lattice of coupled oscillators, the nonlinearity requirement means that waves must be dispersive, so that localized wave-packets become suppressed. Virtually all harmonic heat-bath models in the literature satisfy this constraint, and we have good reason to believe that coherent states and their generalizations are not merely a useful analytical tool, but that nature is indeed full of them. Standard proofs of the CLT rely heavily on the fact that probability densities are non-negative. Although the CLT generally fails if the probability densities are allowed to take negative values, we show that a CLT does indeed hold for a special class of such functions. We find that, intriguingly, nature has arranged things so that all Wigner functions belong to this class.Comment: Final published version. 17 pages, Plain TeX, no figures. Online at http://astro.berkeley.edu/~max/gaussians.html (faster from the US), from http://www.mpa-garching.mpg.de/~max/gaussians.html (faster from Europe) or from [email protected]

Местный рецидив рака предстательной железы после радикальной простатэктомии. Трансректальная ультразвуковая диагностика

Research purpose. Investigate possibilities of the transrectal ultrasonography (TRUS) in early diagnostics of the local recurrence of the prostate cancer (PC) following radical prostatectomy (RPE). Materials and methods. 50 PC patients at the age of 52–73 years (mean age – 62,5 years) that have undergone RPE in different clinics were under our observation. Preoperational prostate-specific antigen (PSA) value mounted 1,7–30 ng/ml. The following stages were determined clinically: Т1N0M0 – 8 patients, Т2N0M0 – 42 patients (Т2а – 38, Т2b – 2, T2c – 2). Following RPE, a positive surgical edge was revealed in 7 patients, tumor invasion to the seminal vesicles – in 3. After performed RPE, PSA level was determined 1 time per 3 months and TRUS in B-mode using energetic mapping (EM) was performed in all the patients. For this, MEDISON company SonoAce 8800 device with convex intracavitary sensor with a frequency 7,5 MHz was used. Results. In 1,5 years after RPE, PSA level increase more then 0,2 ng/ml (0,58–28 ng/ml) was observed. Patients have been examined, including: digital rectal investigation (DRI), TRUS of the prostate bed, helical computed tomography (HCT) of the minor pelvis organs, skeleton scintigraphy. DRI revealed a hardening part in 1 patient, bone metastatic lesion in 2 patients. Via HCT of the minor pelvis organs, a pathologic structure in the prostate bed region with invasion of the posterior bladder wall was revealed. By B-mode TRUS using EM, the areas of solid structure in the region of vesico-urethral anastomosis or behind the posterior bladder wall were revealed in 9 patients, including hypoechogenic with deformed coiled vessels – in 6, isoechogenic with solitary signals by EM – in 2, mixed echogenicity with the posterior bladder wall invasion – in 1 patients. By histological examination of the biopsy materials from the doubtful regions, the PC recurrence is diagnosed in 8 patients, in 1 – histologically local PC recurrence has not been confirmed. Conclusions. TRUS with using EM – is a higly informative, economically and clinically significant method of early diagnostics of the local PC recurrence following RPE.

МЕХАНИЗМ СТАБИЛЬНОСТИ ТОРФЯНЫХ БИТУМОВ

It has been established that the reason for stability of peat bitumes during metamorphism process is the presence of “quasipolyconjugation” systems caused by synergistic effect of the interaction of individual aromatic rings and hydrogen bondings functional groups.Установлено, что стабильность торфяных битумов в процессе метаморфизма обязана наличию систем «квазипо­ лисопряжения», обусловленных синергическим эффектом взаимодействия одиночных ароматических колец и водо­ родных связей функциональных групп

Psychosomatic aspects of managing patientsafter operative treatment in occasion of gynecological pathology

The analysis of the psychological sphere of the women who underwent surgical treatment for gynecological pathology in the amount of 70 people. For the assessment of psychological status of patients was used a number of standard techniques. The data obtained indicate the need psychological help to women with gynecological pathology after surgical treatment.Проведен анализ психологической сферы женщин, перенесших хирургическое лечение по поводу гинекологической патологии в количестве 70 человек. Для оценки психологического статуса пациенток использовались ряд стандартных методик. Полученные данные свидетельствуют о необходимости психологической помощи женщинам с гинекологической патологией после оперативного лечения

Новые аспекты решения проблемы индикации и измерения геопатогенных и аномальных зон = New aspects of solving the problem indication and measurements and geopathogenic anomalous zones

Klimentov V. V., Prohorov G. V., Gozhenko S. A., Zukow W. Новые аспекты решения проблемы  индикации и измерения геопатогенных и аномальных зон = New aspects of solving the problem indication and measurements and geopathogenic anomalous zones. Journal of Education, Health and Sport. 2015;5(4):109-116. ISSN 2391-8306. DOI: 10.5281/zenodo.16658 http://ojs.ukw.edu.pl/index.php/johs/article/view/2015%3B5%284%29%3A109-116 https://pbn.nauka.gov.pl/works/553461 http://dx.doi.org/10.5281/zenodo.16658 Formerly Journal of Health Sciences. ISSN 1429-9623 / 2300-665X. Archives 2011 – 2014 http://journal.rsw.edu.pl/index.php/JHS/issue/archive   Deklaracja. Specyfika i zawartość merytoryczna czasopisma nie ulega zmianie. Zgodnie z informacją MNiSW z dnia 2 czerwca 2014 r., że w roku 2014 nie będzie przeprowadzana ocena czasopism naukowych; czasopismo o zmienionym tytule otrzymuje tyle samo punktów co na wykazie czasopism naukowych z dnia 31 grudnia 2014 r. The journal has had 5 points in Ministry of Science and Higher Education of Poland parametric evaluation. Part B item 1089. (31.12.2014). © The Author (s) 2015; This article is published with open access at Licensee Open Journal Systems of Kazimierz Wielki University in Bydgoszcz, Poland and Radom University in Radom, Poland Open Access. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited. This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited. The authors declare that there is no conflict of interests regarding the publication of this paper. Received: 20.01.2014. Revised 27.03.2015. Accepted: 27.03.2015.   НОВЫЕ АСПЕКТЫ РЕШЕНИЯ ПРОБЛЕМЫ  ИНДИКАЦИИ И ИЗМЕРЕНИЯ ГЕОПАТОГЕННЫХ И АНОМАЛЬНЫХ ЗОН NEW ASPECTS OF SOLVING THE PROBLEM INDICATION AND MEASUREMENTS AND Geopathogenic anomalous zones   В. В. Климентов, Г. В. Прохоров, С. А. Гоженко, В. Жуков V. V. Klimentov, G. V. Prohorov, S. A. Gozhenko, W. Zukow   Научный парк «Профилактическая медицина и охрана труда – новейшие системы и технологии», Одесса Черновицкий национальный университет им. Ю. Федьковича Украинский НИИ медицины транспорта, Одесса Uniwersytet Kazimierza Wielkiego, Bydgoszcz   Science park «Preventive Medicine and Health - The latest systems and technologies ", Odessa Chernivtsi National University Yu. Fedkovicha Ukrainian scientific-research institute of transport medicine, Odessa Kazimierz Wielki University, Bydgoszcz   Abstract   The article deals with the creation of prerequisites for hardware and software system for the study of abnormal and geopathic zones. Analyzes the currently used instruments for detection and measurement of parameters and characteristics of pathogenic influences in anomalous zones. The author's methodology that combines the method of multi-channel measurements of physical quantities with mathematical methods of statistical analysis, since the methods and instruments used for this purpose now, in principle, not reliably determine their qualitative and quantitative parameters of such zones. The proposed approach to the problem is promising interdisciplinary study of natural phenomena.   Keywords: appliance, anomalous zones, geopathic zones, Schumann resonances, electromagnetic field, software and hardware, micropulsations, stochastic resonance.   Реферат   В статье рассматриваются предпосылки создания программно-аппаратного комплекса для исследования аномальных и геопатогенных зон. Анализируются   применяемые  в настоящее время приборы для индикации и измерения параметров и характеристик патогенных воздействий в аномальных зонах. Предлагается авторская  методология,   позволяющая объединить метод многоканальных измерений физических величин с математическими методами статистического анализа, поскольку методики и приборы,  используемые для этой цели в настоящее время, в принципе не позволяют достоверно определять их качественные и количественные параметры таких зон. Предлагаемый  подход к решению проблемы является перспективным направлением междисциплинарного исследования природных феноменов.   Ключевые слова: прибор, аномальные зоны, геопатогенные зоны, резонансы Шумана, электромагнитное поле, программно-аппаратный комплекс, микропульсации, стохастический резонанс