Relevant bibliographies by topics / Bivalent source

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Academic literature on the topic 'Bivalent source'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Bivalent source"

1

Woodward, Todd S., Beat Meier, Christine Tipper, and Peter Graf. "Bivalency is Costly: Bivalent Stimuli Elicit Cautious Responding." Experimental Psychology 50, no. 4 (October 2003): 233–38. http://dx.doi.org/10.1026//1618-3169.50.4.233.

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Abstract. When performing tasks in alternation, substantial slowing occurs when the stimuli have features relevant to both tasks (i.e., when stimuli are bivalent as opposed to univalent). One possible source of this slowing, herein called a bivalency cost, is that encountering bivalent stimuli leads to a more cautious response style. To investigate this, we employed a paradigm that required performing three simple tasks, with bivalent stimuli occasionally encountered on one task. The results show that regardless of the feature overlap among the stimuli used for the different tasks, the introduction of bivalent stimuli slowed responding on all tasks and it was accompanied by a decrease in response errors. Overall, it appears that bivalent stimuli recruit a more cautious approach to task-switching performance.
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Lavania, U. C., Sangeeta Srivastava, and J. Sybenga. "Cytogenetics of fertility improvement in artificial autotetraploids of Hyoscyamus niger L." Genome 34, no. 2 (April 1, 1991): 190–94. http://dx.doi.org/10.1139/g91-030.

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Genetically stable artificial autotetraploids with over 90% seed set were obtained by colchicine treatment of the solanaceous species Hyoscyamus niger L. (4x = 68). The tetraploids were vigorous and had earlier been shown to yield considerably more tropane alkaloid per individual than the source diploids. The tetraploids had high bivalent frequencies at meiosis, and high fertility as a result of the formation of genetically balanced gametes. There was a systematic and significant decrease in quadrivalent frequency and an increase in bivalent frequency in three subsequent generations tested (C0, C1, C2). Possible causes of high bivalent frequency are discussed. Seed fertility can probably be increased in advanced generations by further selection for fertility and maximization of heterozygosity.Key words: Hyoscyamus niger, autotetraploid, meiosis, bivalents, fertility, selection.
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Tymová, Petra, Iveta Skotnicova, and Zdenek Galda. "Identification of a Percentage of Engagement of the Bivalent Source of the Earth–Water Type Heat Pump in Heating of the School Using the DDFPM Method." Advanced Materials Research 1041 (October 2014): 135–38. http://dx.doi.org/10.4028/www.scientific.net/amr.1041.135.

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The calculation based on the DDFPM method will enable us to identify the percentage engagement of the bivalent source in heating of the facilities in the period under consideration and at the location under consideration and we will be able to verify an optimum design for covering the heat loss by the bivalent source of the heat pump.
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Tagiuri, Renato, and John Davis. "Bivalent Attributes of the Family Firm." Family Business Review 9, no. 2 (June 1996): 199–208. http://dx.doi.org/10.1111/j.1741-6248.1996.00199.x.

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Although family-owned and managed firms are the predominant form of business organization in the world today, little systematic research exists on these companies. This paper builds upon insights found in the emerging literature on these enterprises and upon our own observations to provide a conceptual framework to better understand these complex organizations. We introduce the concept of the Bivalent Attributes—a unique, inherent feature of an organization that is the source of both advantages and disadvantages— to explain the dynamics of the family firm.
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Kurbangaleeva, M. H., and R. H. Giniatullin. "Development of Аctions for Мinimization of Ions of Manganese in Sewage of Soda Production." Ecology and Industry of Russia 23, no. 2 (February 8, 2019): 48–51. http://dx.doi.org/10.18412/1816-0395-2019-2-48-51.

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It is studied and revealed sources of bivalent manganese in technological waters of soda production. It is established that a source of this component are raw materials - limestone and with increase in depth of development of breed the content of compounds of manganese increases. The further research on a technological chain of solid waste of soda production and observation wells in close proximity to sludge collectors has shown that the content of compounds of manganese doesn't exceed a natural background. Purification of technological waters of ions of manganese was carried out with use of reagents: potassium permanganate; sodium sulfide; suspension of weak limy milk. For purification of technological waters of ions of bivalent manganese suspension of weak limy milk is offered, at the same time cleaning of this component for 99,9 % is reached.
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Doseva, Nadezhda, and Daniela Chakyrova. "Life cycle cost analysis of different residential heat pump systems." E3S Web of Conferences 207 (2020): 01014. http://dx.doi.org/10.1051/e3sconf/202020701014.

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Nowadays, the application of air-source heat pumps for heating and cooling in residential buildings has been increased significantly. The main occasion for this is the accessibility of a heat source for these devices - the external air. Nevertheless, the increase of the energy efficiency of the air source heat pump systems is a difficult design problem because their capacity and performance are a function of the dynamically changing parameters of the outdoor air. Because of that, the main aim of this study is to develop an approach for choosing a structural scheme of an air-to-water heat pump system under specific climatic conditions. The considered systems are monovalent, bivalent-parallel and bivalent-alternative heat pump systems. In the current paper is conducted a dynamic energy modeling of heating and cooling demand of a typical residential building situated in Varna, Bulgaria and applying the bin temperature data. It is assessed the effect of the heat pump capacity over the annual and seasonal energy performance of the heat pump systems. It is established the effect of the bivalent temperature, cut-off temperature and on-off cycles duration on rates of the criteria for techno-economic assessment. The seasonal coefficient of performance (SCOP), seasonal energy efficiency rate (SEER) and life cycle costs (LCC) of the analyzed heat pump systems are adopted as assessment parameters.
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Köse, E., A. Prof Sauer, and C. Pelzel. "Energieflexibel durch bivalente Produktionsanlagen*/Energy flexibility through bivalent production facilities - Using bivalent production processes to reduce energy costs and stabilize the electricity grid." wt Werkstattstechnik online 107, no. 05 (2017): 366–72. http://dx.doi.org/10.37544/1436-4980-2017-05-62.

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Aufgrund der fluktuierenden Energieerzeugung aus regenerativen Energiequellen sind die Strompreise an der Börse zum Teil enormen Schwankungen unterworfen. Die hier modellierte bivalente Spritzgussmaschine kann bei Bedarf zwischen zwei Energieträgern wechseln. Die Berechnung des Instituts für Energieeffizienz in der Produktion (EEP) auf Basis der modellierten bivalenten Spritzgussmaschine zeigt, wie sich die Energiekosten durch einen Energieträgerwechsel verringern lassen, ohne die Produktion zu unterbrechen.   Due to the fluctuating energy generation from renewable sources, electricity prices on the stock exchange are often subject to strong fluctuations. The bivalent injection molding machine modeled here can switch between two energy sources, if required. EEP‘s calculation based on the modeled bivalent injection molding machine shows how energy costs could be reduced by changing the energy supply without interrupting the production.
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Demiyan, V. V., E. A. Zelenskaya, and N. P. Shabelskaya. "Electrolytic Behavior of Nickel in Polarization by Variable Asymmetric Rectangular Current in Alkaline Solutions." Solid State Phenomena 299 (January 2020): 1010–16. http://dx.doi.org/10.4028/www.scientific.net/ssp.299.1010.

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The paper presents experimental data on nickel oxidation during electrolysis under rectangular alternating current in alkaline solutions, when the cathode pulse (Iк ) is greater than the anode pulse ( Iа ). During the process, intense nickel destruction occurs forming bivalent oxide powder. Under prolonged electrolysis, this powder deposits at the bottom of the electrolyzer in the form of a sponge. The results obtained can be used to produce active mass in the porous nickel oxide electrode of a chemical current source.
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9

Hallam, T. J., R. Jacob, and J. E. Merritt. "Evidence that agonists stimulate bivalent-cation influx into human endothelial cells." Biochemical Journal 255, no. 1 (October 1, 1988): 179–84. http://dx.doi.org/10.1042/bj2550179.

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Human umbilical-vein endothelial cells stimulated with thrombin or histamine show an increase in [Ca2+]i (cytoplasmic free calcium concn.) that is maintained well above the basal pre-stimulated value as long as agonist and a source of extracellular Ca2+ are present. These results provide circumstantial evidence that agonists stimulate influx of Ca2+ across the plasma membrane and into the cytoplasm. Here, we have used Mn2+ as the extracellular bivalent cation which can bind to the fluorescent Ca2+ indicator fura-2 to quench its fluorescence completely. Human umbilical-vein endothelial cells were loaded with fura-2 and, in the presence of extracellular Mn2+, thrombin and histamine were shown to cause quenching of the intracellular dye. This result demonstrates conclusively that agonists can stimulate the influx of bivalent cations. Stimulated discharge of Ca2+ from intracellular stores and influx of Mn2+ were temporally resolved in the same cells to show that release of Ca2+ from intracellular stores clearly precedes influx. Influx of Mn2+ was also demonstrated when extracellular Mn2+ was added after agonist at a time when [Ca2+]i had fallen back to the basal value, showing that influx is not dependent on elevated [Ca2+]i.
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Boiko, O. P., O. M. Sen, B. M. Kurtiak, M. S. Romanovych, T. O. Pundiak, G. V. Sobko, and L. V. Romanovych. "Production testing of antigenicity and immunogenicity of bivalent inactivated vaccine salmonellosis vaccine." Scientific Messenger of LNU of Veterinary Medicine and Biotechnologies 21, no. 96 (December 14, 2019): 28–32. http://dx.doi.org/10.32718/nvlvet9605.

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Scientists of both human and veterinary medicine combine their potential to develop new or improve old instruments in order to rein the problem of foodborne salmonellosis in Ukraine. According to the experience of European poultry industry, the most effective measure for the prevention of avian salmonellosis is total vaccination against salmonellosis of laying hens and breeding birds. In our country, the epizootic situation of salmonellosis of animals and poultry is consistently favorable. At the same moment nearly 90% of foods born Salmonella outbreaks are of poultry and egg products origin. In other words the source of major source of Salmonella agent is avian origin. Currently no vaccines of native origin have been registered in Ukraine. Although there have been numerous attempts to develop a vaccine against avian salmonellosis. The purpose of our work is to evaluate the antigenicity and immunogenicity of the two experimental series of bivalent inactivated emulsified vaccine against avian salmonellosis in production conditions. During the examination of the vaccine in the poultry farm it was found that for 21 days after the re-introduction of the vaccine, the titers of antibodies to the mono-antigens S. Typhimurium, Enteritidis and Gallinarum in the Agglutination Test (AT) and Indirect Hemagglutination Test (IH) were: 1 : 640–1280 to 1 : 2560–5120 respectively. This indicates high antigenicity of the vaccine. No significant difference between the levels of antibodies to Typhimurium and Enteritidis antigens was detected neither in AT nor IH. At the same time the levels of antibodies to mono-antigen Gallinarum were markedly lower in both reactions (1 : 160–1 : 320 – in AT and 1 : 320–1 : 1280 – in IH), but high enough to indicate that the vaccine creates a tense cross-humoral immunity to Salmonella surface antigens of Gallinarum serovar. The results of study of immunogenicity of the vaccine show that the vaccine is highly immunogenic. It means that after control infection of vaccinated hens none of tested Salmonella strains (S. Typhimurium and S. Enteritidis) were isolated from any organs, whereas in the control non-vaccinated group of birds both Salmonella test-strains were isolated from all organs. The obtained results provide a basis for further phases of the vaccine estimating followed by its registration in the prescribed manner.
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Dissertations / Theses on the topic "Bivalent source"

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Šmarda, Milan. "Vytápění panelového domu tepelným čerpadlem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231737.

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Diploma thesis deals with change of heating source for a block of flats with aim to reduce heating costs. Thesis contains calculations of energy requirements of house, including requirements for heating and domestic hot water preparation. Several ways of heating by a heat pump were designed based on the calculated values. Each variant of the designed heating system is compared with current operational costs. Possible cost economies and maximum value of investment costs of the heating system were assessed
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Železný, Jan. "Návrh vytápění rodinného domu pomocí tepelného čerpadla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254407.

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The master’s thesis contains design for heat insulation of a family house for purpose of reducing the heat loss, adding a new room and complete design of heating system. First part is introducing the house, followed by calculating the heat loss for the original building. Next step proposes the heat insulation of constructions, design for the new room and recalculating the modified heat loss including comparison with the original values. Another part is dealing with the design of the heating system, providing calculations of the power requirement and the pressure loss of underfloor heating and panel radiators. After that there was the selection of the heat pump, bivalent heat source, choice of storage tank and solution for domestic water heating. In the last part the security components were checked, drawing documentation were created and attached and the calculation of return on investment was made.
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Skočík, Lukáš. "Návrh otopné soustavy s tepelným čerpadlem vzduch-voda v kombinaci s bivalentním zdrojem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231673.

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The thesis is engaged in complete reconstruction of a heat system of a family house with higher heat loss, i.e. heat source, piping and radiators. As a heat source is chosen air-water heat pump. Heat system is designed with panel radiators with regard to minimum building interventions. A required power for hot water heating is calculated and selected a heat pump from suitable power range in combination with storage tank with hot water tank. The bivalent point is determined, as backup source are heating elements installed in storage tank. Drawings and circuit diagrams with safety elements are attached. In the end is calculation of estimated return.
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Španihelová, Kateřina. "Návrh otopné soustavy s tepelným čerpadlem vzduch-voda a zdrojem na tuhá paliva pro vytápění rodinného domu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231159.

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The aim of this thesis is to design the heating system for the house, including the design and calculating the required quantity of heat for hot water. The specified heat sources are the heat pump air to water and solid fuel boiler. The task was to design the heating system to the fastest possible return on investment. The initial investment in a heat pump is high so it is necessary to design the heating system as efficiently as possible. The thesis contains a complete project of calculating heat loss of the building, the design of heating surfaces and their heat-technical calculation. There is included the design of the pipe system, the calculation of pressure loss and its regulation. The thesis also includes design of safety equipment, temperature regulation and drawings. On the basis of calculated data was processed economic assessment, which determines the return on investment to the heat pump. Compared to the gas condensing boiler the return on investment will ideally be after five years.
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