[Darya]
[Yu Long]
[Amir]
[Anh]
[Mais]
[Darya]
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2 место - продано (договор 12) 3 место - продано (договор 13) 4 место - продано (договор 14) 5 место - продано (договор 15) Дополнительно по статье: Metal hydride materials are actively used as anode materials for Ni-MH batteries. Various high conductive additives (graphite, nickel, copper, etc.) to the active hydrogen storage material are used to increase the electrical conductivity and mechanical stability of the electrodes. In this work, metal hydride electrodes based on AB5 type alloy mixed with carbonyl nickel in various mass ratios are prepared and studied. The electrochemical properties of the prepared electrodes, such as activation performance, maximum discharge capacity, and high rate dischargeability are investigated in detail. Заказать публикацию № 1 Номер заказа № 1 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 22) 3 место - продано (договор 23) 4 место - продано (договор 24) 5 место - продано (договор 25) 6 место - продано (договор 26) Дополнительно по статье: The article is devoted to the development of enriched diet ice cream technology for a wide range of consumers. The analysis of numerous literature on functional enrichment components determined the relevance of the use of products of biological origin. In this regard, organoleptic and physico-chemical studies of milk ice cream were obtained using the technology, which provides for the inclusion in the formulation of beekeeping products - bee pollen - pollen and water propolis extract. The choice of these components is explained by the high content of amino acids, vitamins, minerals, enzymes and other biologically active substances. The mass fraction of fat and sucrose solids in the product was controlled by traditional methods according to GOST, and organoleptic evaluation was carried out by consistency, structure and taste. The paper gives the rationale for the use of additives, and also determines the optimal dose for making milk ice cream. It was found that the introduction of propolis is recommended in an amount of 0.6%, bee pollen in an amount of 1.0%. These dosages did not impair organoleptic and physico-chemical parameters, but at the same time allowed enriching the product with biologically valuable components. In the future, it is planned to expand research on the use of food additives in dairy products for the functional enrichment of their composition. Заказать публикацию № 2 Номер заказа № 2 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 32) 3 место - продано (договор 33) 4 место - продано (договор 34) 5 место - продано (договор 35) 6 место - продано (договор 36) Дополнительно по статье: The question arises of a rational method of feeding small cattle, which would ensure a high rate of their growth, development and production of meat products due to the fact that in recent years in Russia more and more attention has been paid to the development of sheep husbandry. It is economically feasible to use feed additives of various actions for this purpose, which determined the relevance of the topic of our study. The task was set to consider the effect of the sorbent Glauconite and the sorption-probiotic preparation Biogumitel in the diet of sheep of the Romanovskaya breed on the morphological and biochemical parameters of blood, as well as meat productivity. Scientific and economic experience was carried out in a farm located on the territory of the Volga Federal District of the Russian Federation on four groups of rams. Studies have shown that feeding the presented additives did not adversely affect the studied parameters. In addition, it was found that test rams gave higher reliable indicators of meat productivity when feeding Biogumitel and Glauconit supplements together at a dose of 0.1 g per 1 kg of live weight each. Further research is planned to be devoted to studying the quality of meat products, as well as adipose tissue of various localization. Заказать публикацию № 3 Номер заказа № 3 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 42) 3 место - продано (договор 43) 4 место - продано (договор 44) 5 место - продано (договор 45) Дополнительно по статье: In the gerodietic nutrition production technology there are a lot of questions that today remain unanswered. The development of recipe compositions that are fully balanced in terms of amino acids, macro- and microelements and vitamins based solely on the internal reserves of raw materials is a difficult task. As a result of our research we suggest the cutlet recipe with vitamins for gerodietic nutrition. The recipe composition includes chickpea flour, vegetables and amino acid additives - Amur grape seed flour. The proposed product meets the established requirements for gerodietic products. Заказать публикацию № 4 Номер заказа № 4 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 52) 3 место - продано (договор 53) Дополнительно по статье: The article is devoted to the use of low-intensity laser radiation and pectin containing feed additives in animal husbandry to activate the excretion of radionuclides through the gastrointestinal tract and kidneys of black-motley bulls for fattening in order to reduce their retention in the body. As a result of the studies, the high efficiency of these factors is proved. The specific most effective radiation doses for gobies were determined. Mountain ash berry as a food supplement is recommended to enhance the positive effect of low-intensity laser radiation. Заказать публикацию № 5 Номер заказа № 5 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 62) 3 место - продано (договор 63) 4 место - продано (договор 64) 5 место - продано (договор 65) 6 место - продано (договор 66) Дополнительно по статье: Feeding that provides animals with good health, high productivity and good product quality at the lowest feed cost is considered complete. For this goal, it is necessary to balance the diet of animals for all nutrients, because even the work of breeders does not guarantee high productivity from animals without a complete diet. The lack of energy in the diet affects all vital functions of the animals body, which caused the need to enrich the diet with energy-carbohydrate feed. This fact determined the relevance of our work. With the help of a computer program, it became possible in a short time to analyze the diet with the inclusion of the studied additive in three different dosages, to assess its structure, nutritional value and to carry out a zoo analysis. The ration was made up for stall and pasture keeping of young cattle of LLC ?Agro-Alliance?, divided into 15 animals in a group. The main fodder was procured in the same farm. The calculation showed that in the experimental groups the ration was as close as possible to the standard values, which indicates the prospects of using the studied type of feed in feeding young animals. Заказать публикацию № 6 Номер заказа № 6 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 72) 3 место - продано (договор 73) 4 место - продано (договор 74) 5 место - продано (договор 75) Дополнительно по статье: The objective of the study was to determine the effect of adding protease obtained from the Bacillus pumilus 3-19 strain to the diet of Hubboard broiler chickens on the growth indicators of poultry and the composition of the cecum microbiota of broiler chickens. As a result of metagenomic analysis of 16S rRNA genes in the contents of the cecum of chickens, it was shown that the control and experimental groups formed two separate clusters, which indicates differences in microbial communities in these two groups. Analysis of alpha diversity showed an increase in species richness in the group of chickens that received protease as a feed additive. On day 35, both groups were dominated by bacterium of Firmicutes (21.13 - 49.01%) and Bacteroidetes (37.68 - 67.72%) groups. It was shown that in the group of chickens receiving protease as a feed additive, the average daily gain in live weight was higher than in the control group by 0.5 kg (P 0.05). The introduction of protease resulted in an increased F/B ratio, which was positively correlated with chicken body weight. Thus, the addition of B. pumilus 3-19 protease to broiler feed leads to improved feed intake and digestibility, which is of great importance for reducing the cost of the final product. The use of protease regulates the cecum microbiota of broiler chickens and increases microbial diversity on 35 day of chicken growth. Заказать публикацию № 7 Номер заказа № 7 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 82) 3 место - продано (договор 83) 4 место - продано (договор 84) 5 место - продано (договор 85) Дополнительно по статье: In this paper, the probiotic properties of Bacillus subtilis GM2 and GM5 strains were studied. It is shown that the use of probiotic additives based on the spores of these bacteria leads to an increase in the live weight gain of broiler chickens by 4.16% and 10.76% relative to the control. Metagenomic analysis showed that representatives of the phylum Firmicutes (54.55%) and Bacteroidetes (30.45%), mainly represented by the families Ruminococcacea and Bacteroidaceae, predominate in the caecal microbiota of broiler chickens on day 42. It was found that a probiotic based on the B. subtilis GM5 strain leads to an increase in the proportion of Firmicutes in caecum by 27% and a decrease in Bacteroidetes by 19%. There was also a significant decrease in the number of representatives of opportunistic pathogenic bacteria of the Enterobacteriaceae family relative to the control group. Заказать публикацию № 8 Номер заказа № 8 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 92) 3 место - продано (договор 93) 4 место - продано (договор 94) 5 место - продано (договор 95) Дополнительно по статье: Studies have shown that feeding the feed additive Elevitduring the preparation of sows for insemination in a dosage of 1.0; 2.0; 3.0; 4.0% over the basic daily diet can increase estrum in replacement sows by 6.6; 20.0; 26.6; 26.6%, respectively, fertilization and prolificacy by 2.1; 5.3; 6.6; 6.6% and 1.0; 4.3; 7.6; 6.5%, respectively. Such a significant increase in the previously mentioned indicators also led to an increase in the total number of piglets by 13.5; 43.2; 60.8; 59.4%, respectively, while their cost at birth decreased by 11.5; 29.7; 37.4; 36.7% compared to the control group. Similar results were obtained from adult sows - estrum increased by 3.4; 10.0; 10.0; 10.0%, fertilization and prolificacy by 0.5; 5.0; 5.0; 5.0% by 0.9; 8.2; 8.2; 9.1%, respectively. At the same time, the total number of piglets at birth increased by 5.8; 28.7; 28.3; 29.1%. Their cost at birth decreased in comparison with the first control group by 5.2; 21.9; 21.5; 21.8%. From the data obtained by us, the best option for feed additive Elevitfeeding both in terms of zootechnical and economic efficiency is - for replacement gilts in the amount of 3.0%; for adult sows - 2.0% over the basic daily diet for the period of preparation for insemination. Заказать публикацию № 9 Номер заказа № 9 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 102) 3 место - продано (договор 103) 4 место - продано (договор 104) Дополнительно по статье: The coatings with controlled degree of hydrophobicity based on epoxy-polyester powder compositions on an aluminum surface were obtained. The study of changes in surface properties (contact angle and surface energy) and the physico-mechanical properties of the coatings, depending on the concentration of the fluorine additive, was carried out. Modification of the polymer powder composition with a fluorine additive leads to a sharp increase in the degree of hydrophobicity from hydrophobic to the formation of a superhydrophobic coating) and the saving of high mechanical properties of the coating obtained on them. Заказать публикацию № 10 Номер заказа № 10 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 112) 3 место - продано (договор 113) Дополнительно по статье: The influence of cross-dusting of silicon and metal targets simultaneously sputtered by argon ions on partial sputtering coefficients of targets materials components is studied to take this effect into account in the technology of gradient optical coating deposition. The effect has been numerically simulated as series of cascades of binary collisions of bombarding ions and recoil atoms with target atoms. Addition of metal atoms (Ti, V, Zr, Hf, Nb and Ta) to the Si target enhances the partial sputtering of Si atoms but addition of Si atoms to the metal targets decreases the partial sputtering of metals atoms. Also the coefficients of reflection (back scattering) of the bombarding argon ions from the targets with different additives have been calculated. It is possible that enhanced sputtering of Si atoms from the coatings with a ?heavy? component by reflected neutralized ions would lead to dusting the ?heavy? target by silicon. Заказать публикацию № 11 Номер заказа № 11 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 122) 3 место - продано (договор 123) Дополнительно по статье: This work examines the influence of chemical anti-icing materials on the frost resistance of the road pavement. Methods and technologies for introducing salt additives into the soil are considered. The preparation of soil with salt additives for testing for frost heaving is described. The kinetics of frost heaving processes of the reference soil sample and soil treated with salt additives was investigated. The influence of type and concentration of the salt additive on the degree of frost heaving of soils was investigated. The negative impact of chemical anti-icing additives on the indicators of frost heaving of soils, especially with uneven salinity, was registered. Заказать публикацию № 12 Номер заказа № 12 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 132) 3 место - продано (договор 133) 4 место - продано (договор 134) Дополнительно по статье: As part of a gas microturbine engine development, a number of new heat exchanger flow channels, which are produced by using additive technologies, are considered. Geometric three-dimensional models of several heat exchanger elements (with internal, external and combined finning - 3 and 6 rows of ribs, spade spiral of three sizes) are created. Also a mathematical modeling of heat carriers in their flow channels is carried out, taking into account heat transfer through the walls. The analysis of calculated thermohydraulic parameters, namely the heat power and pressure losses, is realized. The spade shape of the heat exchanger element allows intensifying heat exchange (comparable to a 3-fin pipe). It has lower hydraulic resistance compared to 6-fin pipes. It has been found that the change in a standard size of spade spiral pipes does not affect their heat exchange characteristics. The disadvantage of pipes with internal fins is a rapid increase of hydraulic resistance during the operation due to a deposition of microturbine exhaust gases soot. Заказать публикацию № 13 Номер заказа № 13 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 142) 3 место - продано (договор 143) 4 место - продано (договор 144) 5 место - продано (договор 145) 6 место - продано (договор 146) Дополнительно по статье: The problem of removing high heat fluxes from a powerful microelectronic element (chip, microprocessor) is one of the most difficult tasks. One of the promising methods for cooling is the use of two-phase systems in a minichannel with a stratified flow regime. Additive technologies allowing the creation of structured surfaces are of increasing interest. The study of heat transfer using structures on the surface in the form of cylindrical protrusions in comparison with a smooth surface with characteristic size (diameter and height) equal to 300 ?m is presented in this work. Заказать публикацию № 14 Номер заказа № 14 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 152) 3 место - продано (договор 153) 4 место - продано (договор 154) 5 место - продано (договор 155) Дополнительно по статье: The process of oxidation of lignite and bituminous coal modified with metal nitrates (Cu, Ce, Na, Co, Fe) in the amount of 5 wt.% is studied. Application of additives to the coal samples is carried out by the method of incipient wetness impregnation with preliminary dissolution of the additive in an aqueous-alcohol solution with a volume ratio of C2H5OH/H2O=50/50. Reactivity of the samples is studied by thermogravimetric analysis in the oxidation mode at a heating rate of 2.5 ?C/min in the temperature range 25-600?C at atmospheric pressure. It has been found that application of activating additives contributes to reduction of the initial temperature of intensive oxidation (Ati=5-97?C) and to a shift of the process to the low-temperature region as a whole. According to the results obtained, the greatest activity is specific for addition of Cu(NO3)2. It is manifested in a decrease in the temperature of the beginning of intensive oxidation ti and an increase in the average reaction rate wav. The Coats-Redfern method is used to calculate activation energy of the oxidation process in the presence of activating additives. Maximum decrease in Eais observed for a copper nitrate-modified coal sample. Заказать публикацию № 15 Номер заказа № 15 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 162) 3 место - продано (договор 163) Дополнительно по статье: The development and implementation of metal hydride technologies face a number of challenges. One of the main problems is the low thermal conductivity of fine powders of hydride-forming materials. This feature, giving the relatively high values of the reaction heat of intermetallic compounds with hydrogen, leads to an increase in the cost of construction of vessels with metal hydrides and heat exchangers, which reduces the competitiveness of hydrogen-based technologies. One of the most promising ways to solve this problem today is the formation of compacts from metal hydride powders by pressing with additives that increase thermal conductivity. In this work, compacts based on AB5-type alloy with composition LaNi4.4Al0.3Fe0.3 prepared using various methods were studied and their properties were compared with the free bed of this alloy. Carbon nanofibers and nickel-foam were used as additives that improve the thermal conductivity of the compacts. The main methods of studying the properties of samples were measuring of hydrogen absorption and desorption PCT-isotherms and investigation of the temperature inside the samples during their heating and interaction with hydrogen. The compacts showed a noticeable improvement in thermal conductivity with a slight deterioration in hydrogen-adsorption properties, which is a promising result. Заказать публикацию № 16 Номер заказа № 16 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 172) 3 место - продано (договор 173) 4 место - продано (договор 174) 5 место - продано (договор 175) Дополнительно по статье: Mineral insulating oils used as dielectric and heat dissipating agent in high voltage oil-filled equipment are subject to oxidation. Oxidation results in the appearance of undesirable substances that reduce the electrical insulating properties of liquids. Therefore, to inhibit the oxidation process, an antioxidant additive is introduced into transformer oils. In the overwhelming majority, 2,6-di-tert-butyl-4-methylphenol (ionol) is used as an inhibitor. Residual concentration of ionol is a regularly monitored parameter. In Russia, the main method for determining the concentration of ionol in oil is gas chromatography. However, fourier-transform infrared spectroscopy should be considered as an alternative method for monitoring the ionol content as it has a number of advantages over the gas chromatographic method. The paper compares the results of the determination of ionol in operational transformer oils using gas chromatography and the IR method. We justified that the method of IR spectroscopy has no limitations as applied to oils from power transformers equipped with adsorption purification systems. Заказать публикацию № 17 Номер заказа № 17 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 182) 3 место - продано (договор 183) 4 место - продано (договор 184) 5 место - продано (договор 185) Дополнительно по статье: Fodder methionine is one of the most important amino acids in animal nutrition, and its deficiency in the ration negatively affects productivity. Currently, the following sources of methionine are represented on the Russian market of feed additives: DL-Methionine and Methionine Hydroxy. Liquid form - Methionine Hydroxy Analog Free Acid (MHA-FA) and dry - calcium salt (MHA-Ca2+). The most popular sources of dry methionine are DL-Methionine and hydroxy analog as calcium salt. Many sources state that the bioavailability of the hydroxy analog varies from 65 to 72% (one of the manufacturers of the commercial hydroxy analog claims that the availability of methionine is 84%). The experiment was carried out on broiler chickens. As a result of the studies carried out, it can be argued that the content of DL-methionine in the ration (in the amount of 65% of the hydroxyanalogue) in comparison with MHA-Ca increases the productivity of broilers: preservation - by 4%; live weight by 4.3%; average daily gains by 4.6%; feed conversion decreased by 7.1%; has a positive effect on meat productivity. Based on the data obtained during the experiment, it follows that the efficiency of MHA-Ca does not exceed 65%, compared to DL-Methionine. Заказать публикацию № 18 Номер заказа № 18 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 192) 3 место - продано (договор 193) 4 место - продано (договор 194) 5 место - продано (договор 195) 6 место - продано (договор 196) 7 место - продано (договор 197) Дополнительно по статье: The intensive development of domestic poultry farming determines the urgent need to achieve the environmental safety of the industrys products, which excludes the introduction of feed antibiotics into the poultry diet. In addition, the existing instability in the market for domestic biological products, whose share is currently no more than 40% and continues to decline steadily, dictates the need to search for approaches to import substitution. An example of a current trend in poultry farming is the use of domestic veterinary drugs of natural origin, which include probiotic feed additives containing cultures of live lactic acid microorganisms, typical representatives of which are enterococci. A wide search for bio-technologically valuable microorganisms among representatives of the genus Enterococcus allowed us to isolate and characterize the Enterococcus faecium ICIS 96 strain, which is promising for creating a probiotic feed additive. It is known from the literature that lactic acid microorganisms are able to regulate the metabolism of poultry. It is appropriate to assume that the culture of E. faecium ICIS 96, when introduced into the diet of poultry, can have a beneficial effect on energy metabolism. Clarification of this assumption determined the purpose of our work. Заказать публикацию № 19 Номер заказа № 19 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 202) 3 место - продано (договор 203) Дополнительно по статье: Overheating of high-performance electronic devices is undesired for long-term reliability. In this regard, two-phase microchannel heat sinks promise high heat dissipation within small temperature budgets using the latent heat of vaporization of the boiling fluid. However, geometrical confinement induces thermofluidic fluctuations and prohibits the use of two-phase microchannel heat sinks in practical applications. Here we for the first-time report flow boiling experiments with surface-active ionic liquid (SAIL) as an additive in water. This concept is inspired by our results of pool boiling wherein bubble coalescence was avoided with SAIL. In comparison to the water where fluctuations were apparent in the slug flow regime, temperature and pressure fluctuations were nearly mitigated up to the heat flux of 700 kW/m2 with an ionic liquid solution. The suppression of instabilities is attributed to the delay in the formation of a big vapor bubble at the inlet of microchannels due to the non-coalescing nature of bubbles formed with the SAIL solution. Заказать публикацию № 20 Номер заказа № 20 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 212) 3 место - продано (договор 213) Дополнительно по статье: Excitation-emission matrices of various plastic package samples were studied. A tuneable 210-310 nm laser was used as an excitation source. The samples of polyethylene terephthalate, polypropylene, and high-density polyethylene of various colour and transparency showed multipeak wideband fluorescence spectra dependent on the excitation wavelength. Principal component analysis demonstrated that the excitation-emission matrices of most samples are well described by two principal components, individual for their types and colorant additives. Despite complex structure of the excitation-emission matrices of different types of the plastic, appropriate linear combinations of the principal components allowed finding a characteristic component for each of them. Заказать публикацию № 21 Номер заказа № 21 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 222) 3 место - продано (договор 223) Дополнительно по статье: Part II of the paper deals with particular numerical schemes used to realize the filtering algorithm for Markov jump processes by indirect observations corrupted by Wiener noises. The orders of accuracy of these numerical schemes are determined. The cases of additive and multiplicative noises in observations are investigated separately: as shown below, the same schemes in these cases have different accuracy. For observations with additive noises, schemes of orders $$frac{1}{2}$$, 1 and 2 are proposed; for observations with multiplicative noises, schemes of orders 1 and 2. The theoretical results are illustrated with numerical examples. Ключевые слова: Markov jump process; maximum a posteriori probability estimate; numerical integration scheme; stable estimate Заказать публикацию № 22 Номер заказа № 22 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 232) 3 место - продано (договор 233) Дополнительно по статье: Abstract: A method of introducing dispersed particles during centrifugal casting of blanks is proposed; it can be used to achieve a more uniform particle distribution. Tungsten and boron carbides are chosen as strengthening particles to increase the radiation resistance. The interaction of additives with a metal matrix is studied by thermodynamic simulation of the high-temperature processes occurring in the carbide?metal matrix system using the Fact Sage software package. The composition of 12Kh18N10T steel is used as the matrix material composition for simulation. Ключевые слова: boron carbide; centrifugal casting; corrosion-resistant steels; metallic melt; precipitation hardening; tungsten carbide Заказать публикацию № 23 Номер заказа № 23 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 242) 3 место - продано (договор 243) 4 место - продано (договор 244) Дополнительно по статье: Abstract?It is known that lithium-containing aluminum alloys possess low pitting corrosion resistance. It has been previously shown that an IFKhANAL-3 alkaline chromate-free conversion composition gives the coatings on a series of aluminum alloys, such as AMg3, D-16, and V95, which are comparable to conventional chromate coatings in terms of protective properties. It should also be noted that inhomogeneous CCs that do not adhere to the substrate are formed in standard chromate conversion composition on lithium-containing alloys; therefore, development of the method for the fabrication of protective CC for 1424 alloy is a relevant task. In this work, the effect of various complexing agents on the oxidation and protective properties of the coatings based on 1424 alloy have been studied. The modifying additives under study have decreased the concentration of different oxides in the conversion compositions providing adsorption of corrosion inhibitors and increase in their protective properties. According to the results of accelerated corrosion tests, integrated use of Trilon B and BTA significantly increases the corrosion resistance of the coatings based on 1424 alloy. Ключевые слова: conversion coatings; corrosion inhibitors; Keywords: 1424 aluminum alloy; pitting corrosion Заказать публикацию № 24 Номер заказа № 24 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 252) 3 место - продано (договор 253) 4 место - продано (договор 254) 5 место - продано (договор 255) 6 место - продано (договор 256) 7 место - продано (договор 257) Дополнительно по статье: A biogenic feed additive based on protein components and immunotropic preparations intended for the fulfillment of the bio-resource potential of fish by activating nonspecific and specific factors of organism protection against eco-technological pressing and for prevention of infectious and invasive diseases improving competitiveness and the effective functioning of fish farms was developed and suggested for use on fish farms. It was established that upon the use of Akwa-Biot-Norm biogenic feed additive based on a polysaccharide complex of Saccharomyces cerevisiae (S. cerevisiae) yeast cells; the average weight of carps at the end of the experiment period was 2.19% higher than the control index in comparison with 2.71% for the live weight gain. With the maintenance of the pond aquaculture we observed moderate impact on water resources, but the use of Akwa-Biot-Norm biogenic feed additive in the carp growing technology reduces the degree of impact of the pond aquaculture on water resources. For example, the locality of the experimental group pond in relation to the locality of the control group pond, the quantity ofreadily oxidizable organic matter was 2.52% higher compared to 1.28% in the case of labile organic matter. The amount and biomass of phytoplankton increased on 4.08 and 9.86%, respectively. Заказать публикацию № 25 Номер заказа № 25 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 262) 3 место - продано (договор 263) 4 место - продано (договор 264) 5 место - продано (договор 265) 6 место - продано (договор 266) 7 место - продано (договор 267) Дополнительно по статье: Abstract: Kinetics of the oxidative degradation of universal strongly acidic cation-exchange resin KU-28 is studied using hydrogen peroxide. The effect the nature and concentration of catalytic additives in the form of copper(II) and iron(II) salts have on the oxidation process is determined. It is found that in noncatalytic degradation, the effective rate constant rises from 0.24 103 to 7.54 103 g1/3 min1 upon an increase in temperature in the range of 348?368 K. The activation energies of the noncatalytic oxidation of the cation-exchange resin with hydrogen peroxide are characteristic of a process that occurs in the kinetic region and total 132.46?141.96 kJ/mol. It is shown that introducing catalytic additives helps lower Ea of the process to 40.90 kJ/mol and the temperature of degradation by 15?25 K. The pattern of change in the surface morphology of the cation-exchange resin granules during oxidative decomposition is revealed. The approximate composition of the products of cation-exchange resin decomposition is identified via gas chromatography?mass spectrometry. Ключевые слова: activation energy; cation-exchange resin KU-28; copper(II) sulfate; Fenton process; hydrogen peroxide; iron(II) sulfate; process rate constant Заказать публикацию № 26 Номер заказа № 26 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 272) 3 место - продано (договор 273) 4 место - продано (договор 274) 5 место - продано (договор 275) 6 место - продано (договор 276) 7 место - продано (договор 277) Дополнительно по статье: Abstract: Data on the kinetics and mechanism of the formation of a solid phase during the hydrochemical deposition of lead selenide films with inhibitors of selenocarbamide oxidation (sodium sulfite, ascorbic acid, and tin chloride) are systematized and analyzed. The effective rate constants of the conversion of a lead salt to selenide and the thickness of PbSe films are shown to depend on the nature and concentrations of the inhibiting additives. The effect of the nature of the inhibitors on the mechanism of nucleation is studied via dynamic light scattering. The stronger inhibiting effect of the simultaneous presence of sodium sulfite and ascorbic acid in the reaction mixture had on the process of selenocarbamide oxidation is confirmed. Ключевые слова: chemical kinetics; hydrochemical deposition; lead selenide; mechanism of solid phase formation; selenocarbamide; thin films Заказать публикацию № 27 Номер заказа № 27 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 282) 3 место - продано (договор 283) 4 место - продано (договор 284) 5 место - продано (договор 285) 6 место - продано (договор 286) Дополнительно по статье: Comparison of the microstructure and the phase composition of the Ti-6Al-4V alloy parts built by various additive manufacturing technologies was carried out by optical and transmission scanning electron microscopy, as well as X-ray diffraction analysis. It was shown that the martensitic phase, formed due to the melt pool fast cooling rate, determined the accommodation mechanisms of shear deformation of the as-built Ti-6Al-4V AM fabricated samples under uniaxial quasi-static tension and impact bending (and, accordingly, their mechanical properties). The effect of microstructure on impact toughness, ultimate impact strength, as well as the crack initiation and propagation energy was investigated by the impact bending tests with recording impact load diagram (force?displacement graph). It was concluded that impact toughness of the Ti-6Al-4V samples built by wire-feed electron beam additive manufacturing was significantly higher than that of ones manufactured by selective laser melting and electron beam melting of a powder. Matching the mechanical properties and SEM micrographs of the fracture surfaces of the as-built Ti-6Al-4V AM fabricated samples enabled to reveal the crack initiation and propagation mechanisms during their quasi-static and dynamic loading. Discussion of the results was carried out using the concept of scale levels of plastic deformation. Ключевые слова: Additive manufacturing; Fracture; Impact bending; Microstructure; Tension; Titanium Заказать публикацию № 28 Номер заказа № 28 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 292) 3 место - продано (договор 293) 4 место - продано (договор 294) 5 место - продано (договор 295) Дополнительно по статье: The use of metal powder as a fuel in the high-energy materials (HEMs) for the propulsion is the most energy-efficient method to increase the specific impulse and improve the combustion characteristics in the chamber. HEMs typically contain aluminum powders with different particle size distribution. To improve the ignition characteristics of the Al-based HEMs, it is advisable to use nonmetals, metals or their oxides as a catalyst. This paper presents the experimental data on the thermal decomposition and ignition of HEM samples based on ammonium perchlorate, butadiene rubber containing nanopowders (NP) of Alex aluminum, amorphous boron, iron, titanium, and copper. Additives of 2 wt% iron and copper NP in the HEM sample with Alex decrease the ignition delay time by 11?16% when the sample is ignited by a CO2 laser in the range of heat flux density of 60?200 W/cm2. They also increase the recoil force of the gasification products outflow with the HEM surface by 1.3?1.5 times due to reduced temperatures of the onset and intense decomposition of HEM under heating. The partial replacement of Alex by a 5 wt% boron NP in the HEM sample reduces the ignition delay time by up to 20%. Заказать публикацию № 29 Номер заказа № 29 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |
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2 место - продано (договор 302) 3 место - продано (договор 303) 4 место - продано (договор 304) 5 место - продано (договор 305) 6 место - продано (договор 306) 7 место - продано (договор 307) Дополнительно по статье: This study aimed to examine nuclear radiation shielding properties of a novel glass system, which has nominal compositions (40-x) B2O3 +40Pb3O4 +20ZnO + xEr2O3 with several substitution proportions of Er2O3 (x = 0, 1, 2, 3, 4 and 5). The conventional solid-state method was utilized to fabricate the Er2O3 doped glasses. To obtain the amorphous nature of manufactured glass samples, X-ray diffraction (XRD) patterns were investigated. Moreover, mass attenuation coefficients (/) of the prepared glasses were adjusted by employing MCNPX simulation code. Other important gamma-ray attenuation parameters namely Half Value Layer (HVL), Mean Free Path (MFP), Effective and Equivalent Atomic Numbers (Zeff and Zeq) and Exposure Buildup Factor (EBF) of the glasses were also extensively addressed by obtaining mass attenuation coefficients (/). The outcomes indicated that the Er2O3 additive enhances the photon attenuation qualification of the glasses. Moreover, the success of glasses in reducing fast neutrons was judged by calculating effective removal cross sections (R). The results showed that increasing Er2O3 additive upgraded the prepared glasses in the attenuation of neutrons as in gamma rays. In addition, the protection ability of the fabricated glasses against alpha and proton charged particles was also evaluated. Charged alpha and proton particles in BPZE5 glass have the shortest projected ranges which are 50.38 m and 436.36 m respectively. It was seen that the increase of Er2O3 additive upgraded the prepared glasses in terms of attenuation of all of the selected radiation types. It can be deduced that these results might help for estimating the effect of Er2O3 on different glass systems in the future. Ключевые слова: Charged particle; Erbium oxide; Gamma ray; Neutron; Shielding; XRD Заказать публикацию № 30 Номер заказа № 30 Самый быстрый и простой способ заказать или задать вопрос, написать нам: Все контакты |