On the Wiener integral with respect to a sub-fractional Brownian motion on an interval

AbstractThe domain Λk,Tsf of the Wiener integral with respect to a sub-fractional Brownian motion (Stk)t∈[0,T], k∈(−12,12), k≠0, is characterized. The set Λk,Tsf is a Hilbert space which contains the class of elementary functions as a dense subset. If k∈(−12,0), any element of Λk,Tsf is a function and if k∈(0,12), the domain Λk,Tsf is a space of distributions

Thermodynamic Characterization of Polymeric Materials Subjected to Non-isothermal Flows: Experiment, Theory and Simulation

Frictional or viscous heating phenomena are found in virtually every industrial operation dealing with processing of polymeric materials. This work is aimed at addressing some of the existing shortcomings in modeling non-isothermal polymer flowing processes. Specifically, existing theories suggest that when a polymer melt is subjected to deformation, its internal energy changes very little compared to its conformational entropy. This statement forms the definition of the Theory of Purely Entropic Elasticity (PEE) applied to polymer melts. Under the auspices of this theory, the temperature evolution equation for modeling the polymer melt under an applied deformation is greatly simplified. In this study, using a combination of experimental measurements, continuum-based computer modeling and molecular simulation techniques, the validity of this theory is tested for a wide range of processing conditions. First, we present experimental evidence that this theory is only valid for low deformation regimes. Furthermore, using molecular theory, a direct correlation is found between the relaxation characteristics of the polymer and the flow regime where this theory stops being valid. We present a new and improved form of the temperature equation containing an extra term previously neglected under the PEE assumption, followed by a recipe for evaluating the extra term. The corrected temperature equation is found to give more accurate predictions for the temperature profiles in the high flow rate regimes, in excellent agreement with our experimental measurements. Next, in order to gain a molecular-level understanding of our experimental findings, a series of polydisperse linear alkane systems with average chain lengths between 24 and 78 carbon atoms are modeled with an applied “orienting field” using a highly efficient non- equilibrium Monte Carlo scheme. Our simulation results appear to substantiate our experimental findings. The internal energy change of the oriented conformations is found to be similar in magnitude with the free energy change, indicating that it is not reasonable to be neglected from a macroscopic energy balance. Furthermore, the inter- molecular interactions are found to play a crucial role in the energy balance of the system, which explains why PEE is not obeyed when high degrees of orientation are achieved. In the end, a structural study is performed on highly oriented configurations of n-eicosane generated through steady-state non-equilibrium molecular dynamics (NEMD). We compare the simulated oriented structures to x-ray diffraction data for crystalline n-eicosane, and conclude that a crystalline precursor is formed during the simulations

Testing Stochastic Models for Simulating the Seeds Separation Process on the Sieves of a Cleaning System, and a Comparison with Experimental Data

A common method of analyzing experimental data is to determine the distributional model which best describes the process under study. In this paper, theoretical statistical models discussed by Tarcolea et al. (2008) are corroborated with data for the cleaning system of a combine harvester, data obtained experimentally in laboratory conditions. The purpose of this paper is to illustrate how some of the continuous distributions can be used for describing the variation separation intensity of seeds on sieve length. The Pearson coefficients show that some curves are far from the normal distribution, and better fits can be obtained with other distributions which can describe more adequately different degrees of skewness and peakedness of the curves. The considered probability laws are: normal, gamma, Weibull and beta distributions. The best results were obtained with gamma and beta distributions, since, for example, the values of the correlation coefficient R2 are in the most of the corresponding cases close to 1

Echokardiographische Beurteilung der globalen und regionalen diastolischen Funktion: Rolle der Myokarddoppelerechokardiographie

Die vorliegende Arbeit fasst klinische Studien zur Untersuchung der globalen sowie der regionalen diastolischen linksventrikulären Funktion zusammen, die in der 1. Medizinischen Universitätsklinik Mannheim zwischen 2002 und 2005 durchgeführt worden sind. Die nichtinvasive Einschätzung des linksventrikulären diastolischen Füllungsdrucks als Indikator der globalen diastolischen Funktion wurde in einem Kollektiv von 176 Patienten mittels aller bisher bekannten Doppler- und Myokarddopplerparameter gegenüber der invasiven Druckmessung validiert. Die Differenz in der Dauer zwischen der pulmonalvenösen Rückströmung und der späten atrioventrikulären Füllung DPVR-A erwies sich in allen Patientensubgruppen als bestes nichtinvasives Korrelat des Füllungsdrucks. Die Myokardrelaxation als regionale diastolische Funktion lässt sich in vivo am besten mittels einer neuen, viel versprechenden Methode, der Myokarddopplerechokardiographie mit Strain Rate Imaging, erfassen. Sie wurde in mehreren klinischen Studien in Ruhe sowie unter Belastung eingesetzt, um: (1) Normwerte für die Parameter der regionalen Relaxation in verschiedenen Altersgruppen zu ermitteln und (2) subklinische Stadien der Myokardschädigung nach Kawasaki Syndrom und nach Vorhofumkehroperation für die Transposition großer Gefäße aufzudecken. Diese Habilitationsschrift gibt also einen Überblick über diagnostische Wertigkeit und Einsatzmöglichkeiten der Myokarddopplerechokardiographie mit Strain Rate Imaging als neue nichtinvasive Methode, wodurch die globale und die regionale diastolische linksventrikuläre Funktion sowohl in Ruhe als auch unter körperlicher Belastung bei verschiedenen Herzerkrankungen der Kinder und Erwachsenen quantifiziert werden können

RESULTS REGARDING THE BEHAVIOR OF NEW VARIETIES OF ALFALFA AT CARACAL AGRICULTURAL RESEARCH AND DEVELOPMENT STATION

In this paper are presented 10 new synthetic cultivars of alfalfa, created at N.A.R.D.I. Fundulea. These are result of alfalfa breeding programme in order to create synthetic cultivars with hight yield potential, high quality and good adaptability to biotic and abiotic environmental conditions. Testing was conducted at C.A.R.D.S. over two years, 2012-2013, under irrigation conditions. In these conditions, new cultivars of alfalfa F 2209-12 and F 2225-12 proved superior to production of fodder and protein per unit area, making an yield of over 15 t/ha dry matter and 3200-3500 kg/ha crude protein

Научная деятельность за годы в области фтизиопневмологии

Scientific performance over the years in the field of phtisiopneumologyÎn articol sunt prezentate direcțiile principale de cercetare ale instituției, performanțele științifice pe perioada de la fondare, implementările în practică, colaborarea științifică pe scară națională și internațională, activitățile conexe cercetării. Implementarea rezultatelor obținute a contribuit la stabilizarea indicatorilor morbidității și mortalității prin tuberculoză și boli pulmonare nespecifice în Republica Moldova.Научная деятельность за годы в области фтизиопневмологи