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Search Results: 1 - 10 of 167378 matches for " E. Batchvarova "
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Meteorological observations of the coastal boundary layer structure at the Bulgarian Black Sea coast
D. Barantiev, M. Novitsky,E. Batchvarova
Advances in Science and Research (ASR) , 2011, DOI: 10.5194/asr-6-251-2011
Abstract: Continuous wind profile and turbulence measurements were initiated in July 2008 at the coastal meteorological observatory of Ahtopol on the Black Sea (south-east Bulgaria) under a Bulgarian-Russian collaborative program. These observations are the start of high resolution atmospheric boundary layer vertical structure climatology at the Bulgarian Black Sea coast using remote sensing technology and turbulence measurements. The potential of the measurement program with respect to this goal is illustrated with examples of sea breeze formation and characteristics during the summer of 2008. The analysis revealed three distinct types of weather conditions: no breeze, breeze with sharp frontal passage and gradually developing breeze. During the sea breeze days, the average wind speed near the ground (from sonic anemometer at 4.5 m and first layer of sodar at 30–40 m) did not exceed 3–4 m s 1. The onset of breeze circulation was detected based on surface layer measurements of air temperature (platinum sensor and acoustic), wind speed and direction, and turbulence parameters. The sodar measurements revealed the vertical structure of the wind field.
Atmospheric boundary layer wind profile at a flat coastal site – wind speed lidar measurements and mesoscale modeling results
R. Floors, E. Batchvarova, S.-E. Gryning, A. N. Hahmann, A. Pe a,T. Mikkelsen
Advances in Science and Research (ASR) , 2011, DOI: 10.5194/asr-6-155-2011
Abstract: Wind profiles up to 600 m height are investigated. Measurements of mean wind speed profiles were obtained from a novel wind lidar and compared to model simulations from a mesoscale model (WRF-ARW v3.1). It is found that WRF is able to predict the mean wind profile rather well and typically within 1–2 m s 1 to the individual measured values. WRF underpredicts the normalized wind profile, especially for stable conditions. The effect of baroclinicity on the upper part of the wind profile is discussed.
Comparison of Large Eddy Simulations of a convective boundary layer with wind LIDAR measurements
J. G. Pedersen, M. Kelly, S.-E. Gryning, R. Floors, E. Batchvarova,A. Pe a
Advances in Science and Research (ASR) , 2012, DOI: 10.5194/asr-8-83-2012
Abstract: Vertical profiles of the horizontal wind speed and of the standard deviation of vertical wind speed from Large Eddy Simulations of a convective atmospheric boundary layer are compared to wind LIDAR measurements up to 1400 m. Fair agreement regarding both types of profiles is observed only when the simulated flow is driven by a both time- and height-dependent geostrophic wind and a time-dependent surface heat flux. This underlines the importance of mesoscale effects when the flow above the atmospheric surface layer is simulated with a computational fluid dynamics model.
Breeding of Common Bean for Resistance to the Physiological Races of Anthracnose Identified in Bulgaria
D. Genchev, P. Christova, I. Kiryakov, M. Beleva, R. Batchvarova
Biotechnology & Biotechnological Equipment , 2010, DOI: 10.2478/V10133-010-0047-X
Abstract: The resistance of common bean to Colletotrichum lindemuthianum is controlled by a number of race-specific genes. To combine various genes for resistance to anthracnose alternating crossing was performed. The resulting recombinant inbred lines (RILs) are based on the cross DG 2-36 [Red Hawk/TO//AB136/3/Red Hawk/TO//TU/4/DG 98-53]. Breeding for resistance to C. lindemuthianum using several physiological races of anthracnose identified in Bulgaria was performed from F1 to F5 generation. Seven RILs of F6 progeny, possessing more than one specific gene for resistance were selected by RAPD and SCAR markers linked to Co-1 and Co-4 genes. The line DG 2-36-58-3 was determined as the most promising by quality complex of growth habit type, vegetation period, type of seeds, yield and presence of Co-1 and Co-4 genes that confer resistance to 74 out of 78 worldwide recognized anthracnose races. Several common bean varieties with useful breeding traits were investigated as a source of Co-2 specific gene. Cultivar ‘Drezden’ and the new Bulgarian variety ‘Beslet’ carrying of two genes for resistance in the Co-2 locus were determined as promising sources of the gene for the future breeding programs to obtain durable resistance to C. lindemuthianum.
Phenol Compounds - Qualitative Index in Small Fruits
V. Kondakova , I. Tsvetkov , R. Batchvarova , I. Badjakov , T. Dzhambazova , S. Slavov
Biotechnology & Biotechnological Equipment , 2009, DOI: 10.2478/V10133-009-0024-4
Abstract: Over the past 10 years, researchers have become increasingly interested in polyphenols. The main reason for this interest is the recognition of the antioxidant properties of polyphenols, their great abundance in our diet, and their probable role in the prevention of various diseases associated with oxidative stress, such as cancer, cardiovascular and neurodegenerative diseases (51). Furthermore, polyphenols, which constitute the active substances found in many plants, modulate the activity of a wide range of enzymes and cell receptors (1). In this way, in addition to having antioxidant properties, polyphenols have several other specific biological actions that are poorly understood. Not all polyphenols are absorbed with equal efficiency. Knowledge of the bioavailability and metabolism of the various polyphenols is necessary in order to evaluate their biological activity within target tissues. The types and distribution of polyphenols in foods and the bioavailability of polyphenols are the topics of our knowledge. Several thousand molecules having a polyphenol structure have been identified in higher plants, and several hundred are found in edible plants. These molecules are secondary metabolites of plants and are generally involved in defense against ultraviolet radiation or aggression by pathogens. These compounds may be classified into different groups as a function of the number of phenols that they contain. This review aims to describe evidences for the effects of polyphenol consumption on health, and to specify which out of the hundreds of existing polyphenols are likely to provide the greatest protection in the context of preventive nutrition. If these objectives are to be attained, it is first essential to determine the nature and distribution of these compounds in fruits. Such knowledge will allow evaluation of polyphenol intake and enable epidemiologic analysis that will in turn provide an understanding of the relation between the intake of these substances and the risk of development of several diseases.
Cluster Model of Formation of Subnuclear and Subatomic Objects  [PDF]
E. E. Lin
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.53018
Abstract:

The paper describes the development results on one-dimensional (1D) asymptotic model of the formation kinetics for the objects (clusters) of subnuclear (quark) and subatomic (nuclear) matters. A concept of the objects distribution density wave φ(a, t) in space of sizes a lies in the basis for analytical description of the processes under consideration. The proposed formalism makes it possible to describe in an adequate way the final outcomes of the well-known catastrophic phenomena in the world of elementary particles. Mass characteristics of different processes of approach to equilibrium in nuclear reactions are calculated.

Extensions of the Constructivist Real Number System  [PDF]
E. E. Escultura
Advances in Pure Mathematics (APM) , 2018, DOI: 10.4236/apm.2018.88044
Abstract: The paper reviews the most consequential defects and rectification of traditional mathematics and its foundations. While this work is only the tip of the iceberg, so to speak, it gives us a totally different picture of mathematics from what we have known for a long time. This journey started with two teasers posted in SciMath in 1997: 1) The equation 1 = 0.99… does not make sense. 2) The concept \"\"?does not exist. The first statement sparked a debate that raged over a decade. Both statements generated a series of publications that continues to grow to this day. Among the new findings are: 3) There does not exist nondenumerable set. 4) There does not exist non-measurable set. 5) Cantor’s diagonal method is flawed. 6) The real numbers are discrete and countable. 7) Formal logic does not apply to mathematics. The unfinished debate between logicism, intuitionism-constructivism and formalism is resolved. The resolution is the constructivist foundations of mathematics with a summary of all the rectification undertaken in 2015, 2016 and in this paper. The extensions of the constructivist real number system include the complex vector plane and transcendental functions. Two important results in the 2015 are noted: The solution and resolution of Hilbert’s 23 problems that includes the resolution of Fermat’s last theorem and proof Goldbach’s conjecture.
ЕЛЕКТРОХ М ЧНИЙ СИНТЕЗ Д ОКСИДУ МАНГАНУ В ПРИСУТНОСТ ОН В Fe2+ ТА Co2+ Electrochemical synthesis of manganese dioxide in the presence of ions Fe2+ and Co2+ Электрохимический синтез диоксида марганца в присутствии ионов Fe2+ и Co2+
Г.В. Сокольський,Н.Д. ?ванова,С.В. ?ванов,E.?. Болдир?в
Proceedings of National Aviation University , 2009,
Abstract: Зразки д оксиду мангану отримано методом анодного осадження з фторвм сних електрол т в на основ сульфату мангану у присутност дом шок он в двовалентних зал за або кобальту. Отриман продукти характеризувалися методами ААС та ДТА. Проанал зовано вплив дом шок он в зал за кобальту на х м чний склад отриманих зразк в Manganese dioxide samples have been prepared by the anode deposition from fluoride containing electrolytes based on manganese sulphate at the presence of additives of iron(II), cobalt(II) ions. Obtained materials were characterised with AAS and DTA. The influence of doping by ions of iron(II) and cobalt(II) on the chemical composition of the samples obtained has been analysed. Образцы диоксида марганца получены методом анодного осаждения из фторсодержащих электролитов на основе сульфата марганца в присутствии примесей ионов двухвалентных железа или кобальта. Полученные продукты характеризовались методами ААС и ДТА. Проанализировано влияние примесей ионов железа и кобальта на химический состав полученных образцов.
Numerical Investigations of a New N-body Simulation Method  [PDF]
E. Vilkoviskij
International Journal of Astronomy and Astrophysics (IJAA) , 2012, DOI: 10.4236/ijaa.2012.23016
Abstract: Numerical investigation of a new similarity method (the Aldar-Kose method) for N-body simulations is described. Using this method we have carried out numerical simulations for two tasks: 1) calculation of the temporal behavior of different physical parameters of active galactic nuclei (AGN) containing a super massive black hole (SMBH), an accretion disk, and a compact stellar cluster; 2) calculation of the stellar capture rate to the central SMBH without accretion disk. The calculations show good perspectives for applications of the similarity method to optimize the evolution model calculations of large stellar systems and of AGN.
Studies on TiO2/Reduced Graphene Oxide Composites as Cathode Materials for Magnesium-Ion Battery  [PDF]
E. Sheha
Graphene (Graphene) , 2014, DOI: 10.4236/graphene.2014.33006
Abstract:

The aim of this work is to introduce a high performance cathode for magnesium-ion batteries. TiO2/reduced graphene oxide (rGO) composites were mixed in ball mill. The samples are charac- terized using XRD and SEM. The spex-milled composites exhibit better electrochemical perfor- mance with higher reversible capacity and excellent cyclability. The excellent electrochemical performance of TiO2/rGO composites is due to their unique structures, which intimately combine the conductive graphene nanosheets network with TiO2 nanoparticles and possess the characteristic parallel channels running along the [010] orientation, which allow easy Mg2+ transport. It was found that layered TiO2 and rGO nanosheets in the composite interlace with each other to form novel sandwich-structured microspheres, which exhibit preferable electrochemical performance in rechargeable Mg batteries.

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