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匹配条件: “Victor M. Vasilev” ,找到相关结果约406720条。
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Composition and Structure of Testate Amoebae Fauna (Protozoa: Arcellinida and Euglyphida) in Durankulak Lake (Northeastern Bulgaria)
Rositsa D. Davidova,Victor M. Vasilev
Ecologia Balkanica , 2012,
Abstract: An ecological study of the testate amoebae fauna in Durankulak Lake (Northeastern Bulgaria) revealed 91 taxa, belonging to 20 genera. The genera Difflugia (34 species), Centropyxis (14), Arcella (6) and Difflugiella (6) had the highest species diversity. The species Trinema enchelys (31.2% relative abundance), Euglypha rotunda (15.1%) and Microchlamys patella (6.6%) were present with high population density and were dominants in the lake. The species richness and abundance of testaceans differed considerably among separate localities. By the mean of some basic indices for structure of communities, a characterization of the diversity of testate amoebae was made.
Effective pulmonary capillary pressure during hyperdynamic porcine endotoxemia
T Handschuh, D Vasilev, M Georgieff, P Radermacher, B ?antak
Critical Care , 2000, DOI: 10.1186/cc728
Abstract: Over 9 h anesthetized and ventilated pigs received continuous intravenous endotoxin (ETX, n=7) or placebo (Sham, n=5). Hydroxyethylstarch was infused to maintain MAP > 65 mmHg together with a sustained 30–50% increase in cardiac output. Mean (MPAP) and pulmonary artery occluded (PAOP) pressures were recorded before and 3, 6, and 9 h after the start of ETX. After signal filtering via a low-pass filter, PCPeff was derived from a bi-exponential fit to the post-occlusion pressure decay curve, back-extrapolating the slower part to the instant of occlusion determined by simultaneously recording the balloon pressure [1]. The contribution of the venous resistance to the pressure drop over the pulmonary vascular bed was calculated as PVRven=(PCPeff-PAOP)/(MPAP-PAOP) [1].See Table.Early endotoxemia results in a pronounced increase of PCPeff both due to increased downstream (i.e.left atrial) pressure as well as increased contribution of the postcapillary pressure drop. Hypoxia and/or early mediator release (i.e. thromboxane) probably assume importance in this context [1]. The later normalization of both PCPeff and PVRven may be due to increased NO formation [3].D Vasilev is supported by the Deutscher Akademischer Austauschdienst.
Transmission and Reflection through $1$D Metallo-Dielectric Gratings of Real Metals under Sub-wavelength Condition
A. T. M. Anishur Rahman,Peter Majewski,Krasimir Vasilev
Physics , 2015,
Abstract: Under the sub-wavelength condition ($w<\lambda/2$), an analytical model of light transmission and reflection through $1$D metallo-dielectric gratings of real metals has been developed. It has been shown that the transmission intensity associated with the Fabry-Perot (FP) resonance of a $1$D metallo-dielectric grating of a real metal decreases with the increasing grating thickness and the dielectric constant of the ridge material. Further, it has also been demonstrated that the intensity of the FP resonance increases with the increasing slit width while it is independent of the grating period ($P$) and the incidence angle (when $P << \lambda$
Extraordinary Optical Transmission: Coupling of the Wood-Rayleigh anomaly and the Fabry-Perot resonance
A. T. M. Anishur Rahman,Peter Majewski,Krasimir Vasilev
Physics , 2015,
Abstract: In this letter, we demonstrate for the first time that by combining the effects of the Wood-Rayleigh Anomaly (WRA) and the Fabry-Perot (FP) resonance, transmission efficiencies of $1$D metallo-dielectric gratings on substrates can be significantly improved compared to when these two phenomena work separately. Results of combining the WRA and the FP resonance can be utilized to eliminate the necessity of using the index matching technique and the core-shell structure for enhancing the performance of extraordinary optical transmission devices. Further, the outcomes of combining the WRA and the FP resonance can elucidate some of the unexplained results in the literature.
Analytical solution of the fundamental waveguide mode of one-dimensional transmission grating for TM polarization
A. T. M. Anishur Rahman,Krasimir Vasilev,Peter Majewski
Physics , 2015,
Abstract: This article presents an analytical solution of the effective index of the fundamental waveguide mode of $1$D metallo-dielectric grating for Transverse Magnetic (TM) polarization. In contrast to the existing numerical solution involving transcendental equation, it is shown that the square of the effective index ($n_{Eff}$) of the fundamental waveguide mode of $1$D grating is inversely proportional to the slit width ($w$) and the refractive index ($n_m$) of the ridge material and varies linearly with the incident wavelength ($\lambda$). Further, it has also been demonstrated that the dependence of $n_{Eff}$ on the grating period ($P$) and the incidence angle ($\theta$) is minimal. Agreement between the results obtained using the solution presented in this article and published data is excellent.
Guidelines for Improvement Information Processes in Commerce by Implementing the Link Between a Web Application and Cash Registers
Julian Vasilev
Theory and Applications of Mathematics & Computer Science , 2012,
Abstract: The main task of the article is clarifying the content of dierent types of costs (which are associated with providinginformation about business processes) and on this basis an identification of opportunities for their reduction maybe found. In this regard, this paper examines business processes in retail in rendering account of sales. A special placein the article is devoted to the analysis of existing models of information technology systems in commercial enterprises.The important question for the adaptation of web applications in commercial enterprises has been developed.Factors contributing adaptation ofWeb applications in business practices are taken in account. Factors hindering their adaptation (such as the relationship of a web application with cash registers a problem that is not widely discussed) are also reviewed. A discussion of various options for improving both the technological model of the information system in enterprises and specific guidelines for the quantification of the proposed approaches to reduce costs is made.
Photonic mode density effects on single-molecule fluorescence blinking
F. D. Stefani,K. Vasilev,N. Bocchio,F. Gaul,A. Pomozzi,M. Kreiter
Physics , 2006, DOI: 10.1088/1367-2630/9/2/021
Abstract: We investigated the influence of the photonic mode density (PMD) on the triplet dynamics of individual chromophores on a dielectric interface by comparing their response in the presence and absence of a nearby gold film. Lifetimes of the excited singlet state were evaluated in ordet to measure directly the PMD at the molecules position. Triplet state lifetimes were simultaneously determined by statistical analysis of the detection time of the fluorescence photons. The observed singlet decay rates are in agreement with the predicted PMD for molecules with different orientations. The triplet decay rate is modified in a fashion correlated to the singlet decay rate. These results show that PMD engineering can lead to an important suppression of the fluorescence, introducing a novel aspect of the physical mechanism to enhance fluorescence intensity in PMD-enhancing systems such as plasmonic devices.
Letter to the Editor  [PDF]
Victor M. Bolanos-Garcia
Advances in Enzyme Research (AER) , 2013, DOI: 10.4236/aer.2013.13004
Abstract: Letter to Advances in Enzyme Research
Hazard analysis and possibilities for preventing botulism originating from meat products
Vasilev Dragan,Vukovi? Ilija
Veterinarski Glasnik , 2008, DOI: 10.2298/vetgl0806317v
Abstract: The paper presents the more important data on the bacteria Clostridium botulinum, the appearance of botulism, hazard analysis and the possibilities for preventing botulism. Proteolytic strains of C.botulinum Group I, whose spores are resistant to heat, create toxins predominantly in cans containing slightly sour food items, in the event that the spores are not inactivated in the course of sterilization. Non-proteolytic strains of Group II are more sensitive to high temperatures, but they have the ability to grow and create toxins at low temperatures. Type E most often creates a toxin in vacuum-packed smoked fish, and the non-proteolytic strain type B in dried hams and certain pasteurized meat products. The following plays an important role in the prevention of botulism: reducing to a minimum meat contamination with spores of clostridia, implementing good hygiene measures and production practice during the slaughter of animals, the inactivation of spores of C. botulinum during sterilization (F>3), and, in dried hams and pasteurized products, the prevention of bacterial growth and toxin forming by maintaining low temperatures in the course of production and storage, as well as the correct use of substances that inhibit the multiplication of bacteria and the production of toxins (nitrites, table salt, etc.).
Study on Productivity of some Legume Crops in Pure Cultivation and Mixtures
Viliana Vasileva,Emil Vasilev
Agriculturae Conspectus Scientificus (ACS) , 2012,
Abstract: In the conditions of pot trial the productivity of birdsfoot trefoil (Lotus corniculatus L.) cv. ‘Targovishte’ 1”; sainfoin (Onobrychis Adans.) breeding N26, white clover (Тrifolium repens L.) cv. ‘Milka’, and subclover (Trifolim subterraneum ssp. brachycalicinum) cv. ‘Clear’, in pure cultivation and in mixtures was studied. The treatments were as follows: 1. birdsfoot trefoil 100%; 2. sainfoin 100%; 3. white clover 100%; 4. subclover 100%; 5. cocksfoot 100%; 6. birdsfoot trefoil+cocksfoot; 7. sainfoin+cocksfoot 8. white clover+cocksfoot; 9. subclover+cocksfoot; 10. birdsfoot trefoil+ subclover; 11. sainfoin+subclover; 12. white clover+subclover. The ratio between components in the mixtures was 50:50. Cocksfoot (Dactylis glomerata L.) cv. ‘Dabrava’ as a grass component was used. It was found, that aboveground dry matter yield of white clover, birdsfoot trefoil, sainfoin and subclover in mixture with cocksfoot was higher as compared to these in pure cultivation. Subclover in mixture with birdsfoot trefoil increased aboveground dry matter yield, but in mixture with sainfoin and white clover did not contribute to increase of their productivity.
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