Passivation of metal nanopowders obtained by electric explosion of semiconductors

The influence of composition and gas flow rate at passivation on content of unoxidized metal, particle size and temperature on the metal nanopowder layer obtained by the method of semiconductor electric explosion has been studied. It is shown that the time of forced passivation can be tens times less in comparison with passivation at spontaneous gas diffusion in powder layer

Причини й умови, що визначають тінізацію економіки України

Шиманський Ф. В. Причини й умови, що визначають тінізацію економіки України / Ф. В. Шиманський // Актуальні проблеми держави і права : зб. наук. пр. / редкол.: С. В. Ківалов (голов. ред.), Ю. М. Оборотов (заст. голов. ред.), Л. Р. Біла (відп. секр.) [та ін.] ; ОНЮА. – Одеса : Юрид. л-ра, 2005. – Вип. 25. – С. 64-68

Прогнозирование дисфагии после вмешательств на задней черепной ямке

Prediction of dysphagia after posterior fossa surgery (PFS) is a cornerstone on the well-timed extubation. Premature extubation is associated with the risk of aspiration, prolonged extubation leads to post-intubation dysphagia. PFSs are complicated by neurogenic dysphagia in 29–66% of cases. The use of classical methods for diagnosing dysphagia in the early postoperative period is difficult. Screening tests are characterized by low specificity.The objective was to develop an objective and accurate  clinical and electrophysiological model capable of predicting dysphagia.Materials and methods.  The study included  123 patients over 16 years old with extracerebral posterior fossa tumors. Somatosensory evoked potentials (SSEPs) were recorded  before the intervention and in the early postoperative period in a state of residual sedation  in intubated patients. Patients were divided into two groups by clinical assessment: without swallowing disorders and with dysphagia.Results. The model allows to identify 19 out of 20 patients with dysphagia and 77 out of 103 patients without dysphagia.Conclusion. The research showed the possibility of objective prediction of neurogenic dysphagia based on an accurate  digital method.Прогнозирование дисфагии после вмешательств на структурах задней черепной ямки (ЗЧЯ) – ключевое звено в принятии решения о своевременной экстубации пациента. Преждевременная экстубация сопровождается риском аспирации, продленная экстубация приводит к постинтубационной дисфагии. Операции на ЗЧЯ осложняются нейрогенной дисфагией в 29–66% случаях. Применение классических методик диагностики дисфагии в раннем послеоперационном периоде у этих пациентов затруднено. Скрининговые тесты отличаются низкой специфичностью.Цель. Разработать объективную и точную клинико-электрофизиологическую модель, способную прогнозировать дисфагию.Материалы и методы. В исследование включены 123 пациента старше 16 лет с экстрацеребральными новообразованиями ЗЧЯ. Запись соматосенсорных вызванных потенциалов (ССВП) производили до вмешательства и в раннем послеоперационном периоде в состоянии остаточной седации у интубированных пациентов. На основании клинической оценки пациенты разделены на 2 группы: без нарушения глотания и с дисфагией.Результаты. Созданная модель позволяет идентифицировать 19 из 20 пациентов с дисфагией и 77 из 103 без дисфагии.Вывод. Работа показала возможности объективного прогнозирования нейрогенной дисфагии на основании точной цифровой методики

Longitudinal Momentum Fraction X_L for Two High P_t Protons in pp->ppX Reaction

We present an analysis of new data from Experiment E850 at BNL. We have characterized the inclusive cross section near the endpoint for pp exclusive scattering in Hydrogen and in Carbon with incident beam energy of 6 GeV. We select events with a pair of back-to-back hadrons at large transverse momentum. These cross sections are parameterized with a form $\frac{d \sigma}{d X_{L}}$ $\sim(1-X_{L})^{p}$, where ${X_{L}}$ is the ratio of the longitudinal momentum of the observed pair to the total incident beam momentum. Small value of $p$ may suggest that the number of partons participating in the reaction is large and reaction has a strong dependence on the center-of-mass energy. We also discuss nuclear effects observed in our kinematic region.Comment: 4 pages, 2 figures, to be published in Proceedings of CIPANP2000, Quebec, May 22-28, 2000, requires aipproc.sty(included

Energy Dependence of Nuclear Transparency in C(p,2p) Scattering

The transparency of carbon for (p,2p) quasi-elastic events was measured at beam energies ranging from 6 to 14.5 GeV at 90 degrees c.m. The four momentum transfer squared q*q ranged from 4.8 to 16.9 (GeV/c)**2. We present the observed energy dependence of the ratio of the carbon to hydrogen cross sections. We also apply a model for the nuclear momentum distribution of carbon to normalize this transparency ratio. We find a sharp rise in transparency as the beam energy is increased to 9 GeV and a reduction to approximately the Glauber level at higher energies.Comment: 4 pages, 2figures, submitted to PR

Recent results from Pb-Au collisions at 158 GeV/c per nucleon obtained with the CERES spectrometer

During the 1996 lead run time, CERES has accumulated 42 million events, corresponding to a factor of 5 more statistics than in 1995 and 2.5 million events of a special photon-run. We report on the results of the low-mass e$^+$e$^-$-pair analysis. Since the most critical item is the poor signal-to-background ratio we also discuss the understanding of this background, in absolute terms, with the help of a detailed Monte Carlo simulation. We show preliminary results of the photon analysis and summarize the results of the hadron analysis preliminarily reported on already at QM'97Comment: 10 pages, 9 figures, Proceedings of the XIV Int. Conf. on Nucleus-Nucleus Collisions,Quark Matter 99, Torino, Italy, May 10 - 15, 199