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Search Results: 1 - 10 of 266553 matches for " Yu. L. Garmazov "
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Novel Technology for Chlorination of Niobium and Tantalum Oxides and Their Low-Grade Ore Concentrates  [PDF]
B. A. Shainyan, Yu. S. Danilevich, Yu. L. Garmazov, A. L. Finkelstein, T. S. Aisueva, V. K. Turchaninov
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2008, DOI: 10.4236/jmmce.2008.72013
Abstract: A novel energy-economic and environmentally benign technological procedure for chlorination of niobium and tantalum oxides as well as their low-grade ore concentrates was elaborated. The process is based on using carbon tetrachloride or silicon tetrachloride as a chlorinating agent under pressure. It proceeds at moderate temperatures and is free from the shortcomings of conventional carbochlorination processes such as the use of chlorine gas at very high temperatures and formation of toxic products and ozone depleting agents (phosgene, carbon monoxide, chlorohydrocarbons).
Dexamethasone Resisted Podocyte Injury via Stabilizing TRPC6 Expression and Distribution
Shengyou Yu,L. Yu
Evidence-Based Complementary and Alternative Medicine , 2012, DOI: 10.1155/2012/652059
Abstract: TRPC6, a member of the canonical transient receptor potential channel (TRPC) subfamily, is an important cation selective ion channel on podocytes. Podocytes are highly differentiated cells located on the visceral face of glomerular basement membrane and featured by numerous foot processes, on which nephrin, podocin, and TRPC6 locate. Podocytes and the slit diaphragm (SD) between adjacent foot processes form a selective filtration barrier impermeable to proteins. TRPC6 is very critical for normal podocyte function. To investigate the function of TRPC6 in podocytes and its relation to proteinuria in kidney diseases, we over-expressed TRPC6 in podocytes by puromycin aminonucleoside (PAN) and observed the changes of foot processes, TRPC6 protein distribution, and mRNA expression. Accordingly, in this study, we further investigated the role of specific signaling mechanisms underlying the prosurvival effects of dexamethasone (DEX) on podocyte repair. Our results showed that podocytes processes of overexpressing TRPC6 were reduced remarkably. These changes could be rescued by DEX via blocking TRPC6 channel. Additionally, our results also showed an improvement in TRPC6 arrangement in the cells and decrease of mRNA expression and protein distribution. From these results, we therefore proposed that overexpression of TRPC6 in podocytes may be one of the fundamental changes relating to the dysfunction of the SD and proteinuria. DEX may be maintained the structure and function integrity of SD by blocking TRPC6 signal pathway and played an important role in mechanisms of anti-proteinuria.
MD Simulated Microstructure of Liquid Sodium Alloyed with Lead  [PDF]
Inessa Yu. Shimkevich, Alexander L. Shimkevich
Materials Sciences and Applications (MSA) , 2014, DOI: 10.4236/msa.2014.58058
Abstract:
The results of molecular-dynamics (MD) simulation are obtained for structural and thermodynamic properties of the molten system, Na1-xPbx (x ≤ 0.1), at 698 K in the model of nearly free electronic gas (NFE approximation). The all numerical experiments are carried out by unified procedure: 1) equilibrating the MD cell 1 ps; 2) calculating partial radial distribution functions gab(r) in 1, 5, and 10 ps; 3) data handling for calculating other characteristics. It follows from this that lead impurity in liquid sodium at concentration in the range of 1% - 10% is characterized by micro-heterogenetic structure in the form of cluster compounds with variable composition. Just therefore the sodium alloys, Na-MIV, with four-group elements of Periodic table have no eutectic in this range of additive concentrations. This eutectic is needed for modifying sodium coolant of the fast nuclear reactor. Therefore it is reasonable to find an alternative alloy of sodium with additive from adjacent groups which has a eutectic in this range of concentrations, for example, the eutectic, Na0.929Tl0.071, with melting point of 64°C. The modified sodium coolant by isotope, 205Tl, can appear attractive for inhibiting the chemical activity of sodium just as the lead alloyed one.
First-Eutectic Features of Polar Metals in Double Systems  [PDF]
Alexander L. Shimkevich, Inessa Yu. Shimkevich
Journal of Crystallization Process and Technology (JCPT) , 2017, DOI: 10.4236/jcpt.2017.73004
Abstract: It is known that the dense part of any liquid metal consists of ramified clusters of almost regular tetrahedrons (triangular pyramids with atoms in their vertexes) that are connected into chains by faces. Any metal additive as a second component of liquid alloy can be both beyond these clusters as separated atoms and into them as inherent clusters. The liquid-metal alloy transfers into the second state, at the first eutectic of the solvent. This polymorphic transition of liquid matrix is discovered in the systems, Pb-K and Na-Pb, by molecular-dynamic simulating their microstructure and in experiments on scattering slow neutrons by these alloys of different compositions. In the first system, the obtained results identify both the homogeneous alloy at low concentrations of potassium in liquid lead and the alloy clustering, (Pb4K)n, at potassium concentrations following the eutectic, Pb0.91K0.09. In the second one at the concentrations of lead more than 2%, just the second state is discovered with the clusters, (Na4Pb)n. One can expect the same polymorphic transition in the eutectic, Na0.93Tl0.07, with the micro-inhomogeneity, (Na6Tl)n, and with the melting point of 64 C. This eutectic maintained by the oxygen-free technology and enriched by the isotope, 205Tl, can become the best coolant for fast nuclear reactors due to the depressed chemical activity of sodium and composition stability.
Bilocal Field Approach and Semileptonic Heavy Meson Decays
Yu. L. Kalinovsky,L. Kaschluhn
Physics , 1992,
Abstract: In this paper we consider the bilocal field approach for $QCD$. We obtain a bilocal effective meson action with a potential kernel given in relativistic covariant form. The corresponding Schwinger--Dyson and Bethe--Salpeter equations are investigated in detail. By introducing weak interactions into the theory we study heavy meson properties as decay constants and semileptonic decay amplitudes. Thereby, the transition from the bilocal field description to the heavy quark effective theory is discussed. Considering as example the semileptonic decay of a pseudoscalar $B$--meson into a pseudoscalar $D$--meson we obtain an integral expression for the corresponding Isgur--Wise function in terms of meson wave functions.
Perceptual Compensation Is Correlated with Individuals' “Autistic” Traits: Implications for Models of Sound Change
Alan C. L. Yu
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0011950
Abstract: Variation is a ubiquitous feature of speech. Listeners must take into account context-induced variation to recover the interlocutor's intended message. When listeners fail to normalize for context-induced variation properly, deviant percepts become seeds for new perceptual and production norms. In question is how deviant percepts accumulate in a systematic fashion to give rise to sound change (i.e., new pronunciation norms) within a given speech community. The present study investigated subjects' classification of /s/ and // before /a/ or /u/ spoken by a male or a female voice. Building on modern cognitive theories of autism-spectrum condition, which see variation in autism-spectrum condition in terms of individual differences in cognitive processing style, we established a significant correlation between individuals' normalization for phonetic context (i.e., whether the following vowel is /a/ or /u/) and talker voice variation (i.e., whether the talker is male or female) in speech and their “autistic” traits, as measured by the Autism Spectrum Quotient (AQ). In particular, our mixed-effect logistic regression models show that women with low AQ (i.e., the least “autistic”) do not normalize for phonetic coarticulation as much as men and high AQ women. This study provides first direct evidence that variability in human's ability to compensate for context-induced variations in speech perceptually is governed by the individual's sex and cognitive processing style. These findings lend support to the hypothesis that the systematic infusion of new linguistic variants (i.e., the deviant percepts) originate from a sub-segment of the speech community that consistently under-compensates for contextual variation in speech.
Pendulum seismic isolation bearings. Design, analysis, experiment
Yu.L. Rutman
Magazine of Civil Engineering , 2012,
Abstract: In the present research a pendular type of seismoisolation system for protection construction from earthquake is considered. Seismic isolation is carried out on the basis of the following principles: the natural frequency of the "protected object - seismic isolation" should be significantlylower than the main energy contained frequency (which leads to high frequencies filtering); damping in seismic isolation systems should be high enough to avoid resonance effects; in seismic isolation systems can be applied elements that limit the level of force that is passed to the protected object (a plastically deformable or friction elements).A design of devices (component of seismoisolation systems) is shown in the article. The methods of seismoisolation systems analysis are described and the results are presented. The main results of dynamic tests of those devices are shown.
Scientific-methodological aspects of communication management on industrial enterprises
L.Yu. Sager
Marketing ì Mened?ment Innovacìj , 2012,
Abstract: The article explains the purpose of communication management and proposes the scheme of communication process. The groups of potential obstacles of effective communication management and basic measures to overcome them are allocated.
Analysis of theoretical basics of internal communications as a necessary condition effective management of enterprise
L.Yu. Sager
Marketing ì Mened?ment Innovacìj , 2011,
Abstract: The article is devoted to the use of communications in terms of management of information and interpersonal interaction in the domestic enterprise level. in the article the basic theoretical aspects of internal communications in the enterprise management system as part of its efficient functioning: clarified the essence of the concept of "communication"; systematized the advantages and disadvantages of internal communications of the enterprises, and their goals on the enterprise; systematized the barriers to effective communication process.
Adaptive Non-singular Terminal Sliding Mode Control for DC-DC Converters
FAN, L.,YU, Y.
Advances in Electrical and Computer Engineering , 2011, DOI: 10.4316/aece.2011.02019
Abstract: DC-DC converters have some inherent characteristics such as high nonlinearity and time-variation, which often result in some difficulties in designing control schemes. An adaptive non-singular terminal sliding mode control method is presented in this paper. Non-singular terminal sliding mode control is used to make the converter reach steady state within a limited time, and an adaptive law is integrated to the non-singular terminal sliding mode control scheme to make the proposed control method have adaptive ability to disturbances, and overcome the limitation on non-singular terminal sliding mode control scheme caused by disturbance boundary value. Simulation results show the validity of this adaptive non-singular terminal sliding mode control approach.
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