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Search Results: 1 - 10 of 587327 matches for " Ivanov A.N. "
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Foam concrete of certain average density for thermal insulation of attic floors (rus)
Ivanov A.N.,Тrеmbitskiy М.А.
Magazine of Civil Engineering , 2011,
Abstract: Energy efficiency of building depends on several factors, including the summary heat losses through the building envelope – walls, windows, attic and basement floors. The leakage of heat through the attic overlap is 10-20%, depending on the number of floors of building. An additional factor, confirming the relevance of the reduction of heat loss through the attic floor, is the problem of the icicles on the roofs.Studies have shown that the most economical and durable insulation, applied to the attic ceilings, is a monolithic foam concrete with natural hardening.For producing foam concrete with required physical and mechanical properties we have developed a calculation-experimental method. This method is based on the manufacturing sequence of eight operations.The developed technique allows to receive foam concrete with natural hardening with a high accuracy with given density in the interval 100-190 kg/m3.
E.V. Andronov,V.F. Kirichuk,A.N. Ivanov,N.V. Mamontova
Saratov Journal of Medical Scientific Research , 2007,
Abstract: In this overview given the information about a role of nitric oxide in the regulation of microcirculatory unit of haemostasis. Discussed the questions about the meaning of nitric oxide in regulation of aggregation activity of platelets and functional properties of red blood cells.
Influence Of Terahertz Range Electromagnetic Radiation At Molecular Spectrum Frequency Of 150+0,75 Ghz Nitric Oxide On Microcirculation Morphofunctional Disturbances In White Rats In Condition Of Acute And Prolonged Stress
I.O. Bugaeva,V.F. Kirichuk,A.N. Ivanov,M.O. Kurtukova
Saratov Journal of Medical Scientific Research , 2009,
Abstract: The effect of electromagnetic radiation of terahertz range at frequency of emission and absorption molecular spectrum of 150+0,75GHz nitric oxide on morphofunctional changes of microcirculation and tissue structure in animals in condition of acute and prolonged immobilization stress has been studied. It has shown that the influence of electromagnetic waves at these frequencies causes activity decrease of hypothalamic-pituitary-adrenal and tireoyd axis of stress reaction. It has been determined that terahertz range waves at frequency of nitric oxide are liable to restore disturbances of intravascular, vascular and extravascular components of microcirculation and also have histoprotective effect
Stress depended changes in activityof gp red blood cells receptors and its correction by therahertz waves at nitric oxide frequency
Kirichuk V.F.,Svistunov S.V.,Andronov E.V.,Ivanov A.N.
Saratov Journal of Medical Scientific Research , 2011,
Abstract: The effect of electromagnetic radiation in the terahertz range frequencies of molecular spectrum of emission and absorption of nitric oxide 150.176–150.664 GHz for the restoration of the impaired carbohydrate component and functional activity glikoproteid receptors of erythrocytes of white rats in a state of acute imm obilization stress. Shown that exposure to electromagnetic waves at these frequencies is the normalization of the increased content of b-D-galactose in the carbohydrate component and the restoration of the impaired activity of the receptors glikoproteid erythrocytes
Correction of stress-depended changes of glucoproteid platelet receptors activity by electromagnetic radiation of terahertz range
V.F. Kirichuk,E.V. Andronov,A.N. Ivanov,S.V. Svistunov
Saratov Journal of Medical Scientific Research , 2010,
Abstract: The research goal is correction of stress-depended changes of glucoproteid (Gp) platelet receptors activity by electromagnetic radiation of terahertz range. Influence of electromagnetic waves of terahertz range at the frequency of molecular spectrum of radiation and absorption of nitrogen oxide on lectin-induced platelet aggregation of white rats in the stressed condition was investigated
Attainment of Self-Reliance through Senior Secondary School Science and Technical Curriculum: An Appraisal
A.N Igboabuchi
African Research Review , 2010,
Abstract: All over the world, the importance of science is never in doubt since the 17th century AD. The countries of Europe were the first to acknowledge and develop it for man’s use. The developing countries of the third world like Nigeria, depend for their total development today on the already developed countries of Western Europe and America. The attainment of good degree of self-reliance had been, since this age of science and technology, the major focus of developing countries. To this effect, Nigeria changed her education structure since 1976 and reorganized her secondary school curricular with emphasis on science and technical subjects with the intention of cultivating scientific culture in Nigeria and equipping secondary school graduates with skills that would make them self-reliant. This work x-rayed the many –sided advantages of science and its application and analyzed the effects of the journey so far as regards the extent the science and technical schools are impacting on the school graduates and the society. The appraisal revealed a near zero impact leading the author to provide possible solutions as a way out of the woods.
Twin birth order, birthweight and birthweight discordance: any relationship
Onyiriuka A.N.
Saratov Journal of Medical Scientific Research , 2010,
Abstract: Background: It is widely believed that in twin pairs, at birth, the first-born weigh more than the second-born but this concept has been challenged. Objective: To assess the truthfulness of this common concept that first-born twins are usually heavier than their second-born siblings at birth. Methods: In a series of 104 sets of live-born twins, the birth weights of first-born twins were compared with those of their second-born siblings, after controlling for gender. Their intra-pair birthweight differences were determined and twin pairs whose birthweight difference was 15% or more were designated as discordant. Results: Twin I was heavier than Twin II in 61.5% of cases while Twin II was heavier than Twin I in 28.9% of cases. Twins I and II had equal birthweights in 9.6% of cases. Comparing the mean birthweight of the first-born-male twin with that of second-born- male twin, it was 2515+427g (95% Confidence Interval, CI=2402-2628) versus 2432 +435g (95% CI=2321-2543) p>0.05. The mean birthweight of first-born-female twin was 2326+445g (95% CI=2214-2439) while that of the second-born-female twin was 2325+501g (95% CI=2197-2453) p>0.05. When the birthweight difference exceeded 750g, the probability that Twin I will be heavier than Twin II was 83.3% (5 of 6). Conclusion: Although the first-born twin was more often heavier than their second-born siblings, either could weigh more or less at birth. The larger the birthweight difference between growth-discordant twin pair, the greater the probability that the heavier twin would be delivered first
Impact of interspousal violence and maternal deprivation on a child's mental health: a case report
Onyriuka A.N.
Saratov Journal of Medical Scientific Research , 2011,
Abstract: This paper presents a case of an emotionally deprived child with some evidence of child neglect resulting from husband-wife violence and subsequent separation of parents. It also further confirms the long recognized fact that the most successful treatment of growth failure and weight loss due to psychosocial deprivation is restoration of a normal social environment. In particular, it highlights the need for a high index of suspicion and awareness on the part of medical personnel with regard to emotional disorders in children
Iranian Journal of Public Health , 1977,
Abstract: There was a statistically significant difference in the number of oocysts, developed in Anopheles stephensi which had fed on mice infected with chloroquine resistant strains (NY 151./2B and. P.y. nigeriensis) and treated with 1 or 10 mg/kg chloroquine phosphate, when compared with the mosquitoes fed on saline injected control animals infected with the same lines. There was no significant difference between the oocyst counts in anophelines that fed on mice which were treated with chloroquine sensitive strains. In the first experiments on rats, with P.y. nigeriensis, greater increase has been shown in oocyst number in mosquitoes fed on dosed rats than in control. In duplicated experiments however, enhancement was approximately double. In chloroquine sensitive strain (ANKA), there was no statistically difference between the numbers, of oocyst developed in chloroquine treated and control rats.
Speleogenesis in carbonate rocks
Speleogenesis and Evolution of Karst Aquifers , 2003,
Abstract: This paper outlines the current views on cave origin in carbonate rocks, combining ideas from a variety of sources. A typical dissolution cave develops in several stages that grade smoothly from one to the next: (1) Initial openings are slowly enlarged by water that is nearly at solutional equilibrium with the local bedrock. (2) As the early routes enlarge, those with the greatest amount of flow grow fastest. (3) These favoured routes eventually become wide enough that groundwater is able to retain most of its solutional aggressiveness throughout the entire distance to the spring outlets. This breakthrough time usually requires times on the order of 104 to 105 years and ends the inception phase of speleogenesis. (4) Discharge along these selected routes increases rapidly, allowing them to enlarge into cave passages rather uniformly over their entire length. Maximum enlargement rates are roughly 0.001-0.1 cm/yr, depending on the local water chemistry and lithology. (5) The cave acquires a distinct passage pattern that depends on the nature of groundwater recharge, the geologic setting, and the erosional history of the region. Branchwork patterns dominate in most carbonate aquifers. Maze caves are produced by any of the following: steep hydraulic gradients (e.g. during floods), short flow paths, uniform recharge to many openings, and mixing of waters that contrast in chemistry. (6) Enlargement rate usually decreases as passages become air-filled, owing to loss of aggressiveness as carbon dioxide escapes through openings to the surface. (7) The cave typically evolves by diversion of water to new and lower routes as the fluvial base level drops. (8) The cave is eventually destroyed by roof collapse and by intersection of passages by surface erosion. At any given time, different parts of the same cave may be experiencing different stages in this sequence.
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