- Все статьи 6181
Статьи журнала - Бюллетень науки и практики
Все статьи: 6181
Статья научная
In the research work, 32 were local (materials of the “Cereals and Legumes” Department of the Institute of Genetic Resources of ANAS) and 25 were introduced by CIMMYT (International Center for Maize and Wheat Improvement), a total of 57 ( Triticum aestivum L.) studied the effect of stress factors on physiological processes of autumn soft wheat genotypes under field conditions, especially drought on the water retention capacity of leaves. Water retention capacity is considered as a very valuable trait of wheat genotypes and is evaluated as resistance to drought stress. As a result of the study, among 57 wheat genotypes, the following genotypes were classified as I- drought resistant (Gobustan (st.) (AZE), Bol wheat (AZE), Grekum75/50 (AZE), Taraggi (AZE), Akinchi84 (AZE), Giymetli 2/ 17(AZE), Sheki 1(AZE), Tale38 (AZE),TX96V2847(US-TX), Arlin/Yuma (USA-KSU), MV Dalma (HU-MV), Desin (RO-FL), Duopebusa (MOL ), SG-S1915 (CZ), U1254-7-9-2-1/TX86A5616//Rina-6)(TCI), II- moderately resistant to drought (Arzu (AZE), Zardabi (AZE), Durdane (AZE), Mirbashir128 (AZE), Nurlu99 (AZE), Ruzi84 (AZE), Aran (AZE), Murov2(AZE), GobustanS2 (AZE), Starshina (RUS-KR), MV06-02 (HU-MV), Gerek (TR- ESK), Gloria (RO-FL), Bezostaya1(TR-ESK), LC924/Petja (BG-SAD), Sonmez (TR-ESK), Dalnitskaya (UKR)) and III- drought (Birlik (AZE), Gurgane 1 (AZE), Karabakh10 (AZE), Parzivan 1(AZE), Parzivan 2(AZE), Azeri (AZE), Saba (AZE), Zubkov (KYR), Steklovidnaya 24 (KAZ)) are grouped as sensitive.
Бесплатно
Статья научная
In this study, evaluated some morphological traits and genotypes by multivariate statistical methods in some oak species ( Q. castaneifolia C. A. Mey, Q. pedunculiflora C. Koch., Q. iberica Stev., Q. macranthera Fisch. & C. A. Mey ex Hohen, Q. ilex L.). 910 leaves were sampled from 91 trees, 8 population across Azerbaijan, and 6 morphological traits were assessed. The indicator traits were analyzed using multidimensional statistical analysis for each species. As a result of the component analysis, the three-pointer element (PRIN1, PRIN2, PRIN3) explained 86.97% of the variance among genotypes. These results provide identification of valuable species and patterns in the future selection and application of other genetic programs on the improvement of oaks in Caucuses.
Бесплатно
Статья научная
The present study characterized the macrobenthic entomofauna of the Sardinas river and the La Delicia stream. Their environmental quality water was determined by applying the BMWP/Col (Biological Monitoring Working Party for Colombia) index in two sampling points, distributed in the Sardinas river and La Delicia stream, during the months of May and June 2017. For its collection, a Surber net was used. In the laboratory, they were classified and identified in class, order and family levels. The specimens were analyzed by calculating the richness (S), abundance (N) and relative abundance (%). A total of 90 individuals belonging to 16 morphospecies were collected. The Hemiptera order with the Veliidae family was the most abundant, encompassing most of the organisms collected 33.33%. The less represented group was the order Diptera with the family Tipulidae with 1.52% of the individuals collected. The water quality was Moderate for the river Sardinas (BMWP/Col 59) and Good for the La Delicia stream (BMWP/Col 75). The present study characterized the community of macroinvertebrates in the study area and the ecological quality of the studied bodies of water.
Бесплатно
Evaluation of winter wheat genotypes under rainfed farming conditions
Статья научная
Drought has a serious effect on the plant height, the heading date and the grain yield of winter wheat genotypes in Mountainous Shirvan. Genotypes of Sonmez 01, Sheki 1, Bezostaya 1 and Gyzilbughda were noted as the tallest (120.1, 118.9, 114.9 and 111.8 cm), Gyrmizigul 1, Guneshli, Tale 38, Aran, Zirva 85 and Azamatli 95 as the short (83.6, 92.8, 95.8, 92.9, 94.0 and 98.0 cm), respectively, which indicates the adaptability of tall varieties for rainfed conditions. Gobustan, Zirva 85, Ruzi 84 and Gunashli genotypes were noted as the early heading, and Bezostaya 1, Sheki 1, Aran, Tale 38, Gyrmizigul 1 and Baba 75 as the late heading, which is associated with their genotypic characteristics. The yield was changed depending on the genotypic characteristics and annual total precipitation during the growing season. The highest yield was recorded in Gobustan and 7WON-SA no. 465 genotypes, while the lowest yield was in Azeri, Bezostaya 1 and Murov 2 during the research. Adaptation to adverse conditions and high yielding of Gyrmizigul 1 genotype shows the possibility of cultivation under adverse conditions. By adaptability to drought high yield of genotypes can be obtained responding to high soil fertility and favorable climatic conditions. Cultivation of these genotypes in rainfed regions such as Mountainous Shirvan is recommended.
Бесплатно
Статья научная
In the context of increasing competition in the banking market, increasing regulatory requirements for transparency and sound risk-creation on this basis of adequate risk provisions in the banking sector is of paramount importance. In this paper, firstly it is proposed to use for estimating credit risks the exact maximum likelihood estimators (MLE) of the structure of stratified population for any sizes of the credit portfolio. These exact MLE could be applied to estimate Basel-II risk parameter PD (Probability of Default), and could be used to optimize provisions for covering expected losses of consumer credit portfolio. In usual banking practice for estimating risk parameter PD the frequencies (rates) of default credits of the whole consumer portfolio or of sub-portfolios of the whole consumer portfolio are usually using. But the statistical characteristics of these estimates, such as unbiased property, consistency, efficiency, exact and asymptotic distributions, usually are unknown. The new statistical estimations have derived for characteristics used in vintage analysis of consumer credit portfolio. These estimations for delinquency rates with different DPD (Days Past Due) are the exact maximum likelihood estimators (MLE) of the structure of stratified population for any sizes of the credit portfolio. These exact MLE could be applied to estimate Basel-II risk parameter PD (Probability of Default), and could be used to optimize provisions for covering expected losses of consumer credit portfolio. Making the adequate provisions to credit risks in the crisis conditions is the problem which needs to estimate risks with satisfactory accuracy.
Бесплатно
Experience vegetative propagation Russian olive (Elaeagnus angustifolia L.) in Uzbekistan
Статья научная
Conducting the results of the research work on the studies optimal timing of harvesting and planting stem cuttings Russian olive. The formation of adventitious roots on cuttings Russian olive is dependent on callus. The roots are laid in the cambium of the stem cuttings and breaking through the crust near the pillow or sheet between the callus and bark. Cuttings Russian olive autumn harvesting and spring planting at the end of the growing season gave the best gain in height - 166.7±5.35 cm (diameter of 10.2 ± 0.47 mm). Annuals plants from cuttings Russian olive autumn harvesting had 30 cm long and a height of 179.8±5,09 cm (diameter of 11.1 ± 0.69 mm) and save 88%. The best survival was observed in the cuttings, prepared with annual shoots. By the end of vegetative growth leading to escape the majority of seedlings Russian olive reaches 83-166 cm in height. Maximum 160-221 cm.
Бесплатно
Статья научная
In this research, the thermal-hydraulic performance of plate heat exchanger (Ridan HHN no. 04) used in domestic water system is investigated experimentally. The hot lubrication/water inlet keep temperature and flow rate constant at 72 °C and 0.8-0.1 L/s, the cold-water inlet remained 12 °C with different velocity. Then the convective heat transfer coefficient increases with enhancement of Reynolds number. Moreover, it is observed that Fanning friction factor decreases with an increase of the Reynolds number and it is showed by the figure. Therefore, it is possible to find that the increase of the Peclet number results in an increase of the Nusselt number as well when Peclet number in water - water smalls than 2500. Finally, we get heat exchanging performances of cold side in lubrication/water - water using plate heat exchanger.
Бесплатно
Experimental research on heat dissipation at the hot end of semiconductor refrigeration chips
Статья научная
TEC1-12705 and TEC1-12706 two types of semiconductor refrigeration chips were designed with different hot-end heat dissipation conditions. At the same time, a test device for heat dissipation of heat pipes for heat sinks with separate current input and two-stage refrigeration was designed, and the influence of hot-end heat dissipation conditions on cold-end temperature was analyzed. The test results show that the cold terminal temperature of the semiconductor refrigeration sheet is related to the heat dissipation capacity of the hot terminal. Under the condition of limited heat dissipation capacity, the cold terminal temperature decreases first and then increases with the increase of the input current; and under the condition of ensuring the heat dissipation capacity, the cold terminal temperature decreases with the increase of the input current and decreases with the decrease of the hot terminal temperature. The two-piece TEC1-12706 semiconductor refrigeration sheet adopts two-stage refrigeration with separate current input, and the minimum temperature of the cold terminal can reach -36,8°С. The test results show that improving the heat dissipation conditions of the hot end can improve the performance of a single semiconductor refrigeration sheet. At the same time, under the best heat dissipation conditions, the use of separate current input two-stage refrigeration can greatly reduce the temperature of the cold end, which is of great significance to improve the working temperature difference of the semiconductor refrigeration sheet.
Бесплатно
Experimental study of cavitation heat generator for heating water
Статья научная
The energy released by cavitation is a new method to make full use of energy. Based on this, a new type of cavitation heat generator for heating water is designed. A conical core is used instead of the traditional throttling element to build a set. Closed circulation system device, the performance of the cavitation heat generator when the cone core with different cone angles was tested in the test. The temperature difference and pressure difference before and after the three groups of liquid medium flow through the cavitation heat generator were measured experimentally. The results show that the cavitation heat generator with a 30-degree tapered core has the best performance and improves the heating efficiency of the feed water, which has a great reference value for the further study of cavitation heat transfer.
Бесплатно
Experimental study on a pulsation-enhanced heat transfer device
Статья научная
The pulsation-enhanced heat transfer technology is introduced, and a volume coil heat exchanger is designed. A pulsation valve is installed at the heat exchanger outlet of the heat exchanger to pulsate the heat medium, and the same heat exchanger is subjected to pulsation and non-pulsation heat transfer tests. Based on the experiments, combined with the theory of pulsation-enhanced heat transfer technology, heat transfer capacity, heat flow, and convective heat transfer coefficient coefficients, the effective temperature difference, heat flow, and convective heat transfer coefficient of the heat exchanger at different pulse frequencies are analyzed. The relationship between the pulsation frequency of the heat transfer effect of the heat exchanger is obtained. The test results show that the heat exchanger has higher heat exchange efficiency when there is pulsation under the test conditions.
Бесплатно
Experimental study on heat transfer and pressure drop in plate heat exchanger using water-water
Статья научная
It would be misguiding to consider only cost in design of a heat exchanger because high maintenance costs increase total cost during heat exchanger’s services life. Therefore, exergy analysis and energy saving are very important parameters in heat exchanger design. In this study, the effects of pate heat exchanger (PHE, Ridan HHN no. 04) on heat transfer, friction factor and exergy loss were investigated experimentally. Experiments were conducted from laminar flow condition to turbulence flow condition under counter flow condition. Reynolds number and Prandtl number were in the range of 220
Бесплатно
Experimental study on heat transfer of pulsating flow enhanced the plate heat exchanger
Статья научная
We conducted two sets of experiments, one is under steady-state conditions and the other under pulsating conditions. We focused on measuring the heat transfer characteristics of plate heat exchangers under different pulsation conditions. In the experiment, we control the mass flow of the hot fluid to circulate at a rate of 0.722 kg/s. The mass flow rate of the cold fluid is 0.05-0.18 kg/s, and the pulsation frequency is 0.45-2.23 Hz. We measured different mass flows at different pulsation frequency. The data analysis shows that when the pulsation frequency is 1.78 Hz, the heat transfer coefficient reaches a maximum of 4415.73 w/(m2·k), and the corresponding cold fluid mass flow rate is 0.155 kg/s, and compared with the heat transfer characteristics of the plate heat exchanger under steady flow, it is found that the average increase in the heat transfer coefficient during the transition to the pulsating mode was 20%.
Бесплатно
Experimental study on unidirectional flow characteristics of flow diode
Статья научная
Flow diode is a kind of control fluid one-way flow of components, it has many advantages, such as simple structure, no rotating parts, no need for external control, power, high reliability, in the medical industry, nuclear industry, petrochemical industry, flow diode has a wide range of applications. By studying relevant literature, combined with the actual situation, based on the experimental study method, using air pump, pressure regulator, 3 d printers and other laboratory equipment, by changing the pump seal the air inlet, simulation of different flow diode under different conditions make the fluid flow through, will pump displacement into displacement, record each air inlet in unit time displacement, and then compared these data, the flow is obtained by carefully analyzing the flow characteristics of diode and the relationship between the fluid flow characteristics diode, it is concluded that: the displacement increases with increase of voltage; when the aperture changes, the flow diode will produce important changes; unstable flow characteristics of variable diameter flow diode.
Бесплатно
Статья научная
A universal technique has been suggested for express-evaluation and minimization of labor and financial resources for sustainment of administrative agencies. It is suitable for any country and allows evaluating potentialities for reducing the resource intensity of administrative processes, optimizing administrative personnel staffing levels, and identifying and excluding overlapping of processes and operations. This article was prepared on the results of research carried out with the support of the Russian Foundation for Basic Research (RFBR)-project 15-01-06324/15 “Modeling ofproduction and management processes for rapid assessment and optimization of resource consumption of goods and services: the formation of a universal methodology and tool support”.
Бесплатно
Expression of figurative thinking of children in the heroes of works of art
Статья научная
This article examines several examples of children's literature and analyzes the characteristics, psyche, worldview and thinking of children who are the protagonists, showing the advantages of the age-specific form of thinking in figurative thinking.
Бесплатно
Extracurricular work as a means of motivation to learn a foreign language
Статья научная
This article defines the principles of the organization of extracurricular work in a foreign language, the influence of extracurricular activities on the expansion of students' cultural views, the development of their creative activity, aesthetic tastes is noted. The purpose of the study is to generalize and systematize the theoretical and practical experience of extracurricular work in a foreign language in secondary schools.
Бесплатно
Factors of economic stability of Russia in conditions of sanctions
Статья научная
In the article directions of development and stabilizing of economy of Russia are examined in the conditions of external economic approvals and internal budget constraints. The consequences of introduction of approvals and possibility of the economy growing are analyzed: investment height, forming of the Asian vector of international relations and support of home production.
Бесплатно
Factors shaping social debt and feelings of pride during adolescence
Статья научная
The problem of forming a sense of social debt and pride in adolescents is of a social nature. Consequently, the formation of a sense of social debt and pride in adolescents encourages them to work selflessly for the prosperity of the Motherland, the prosperity of the country and the well-being of the people. The article discusses the factors that shape social debt, pride, social environment, humanity, pride and sense of value in adolescents.
Бесплатно
Family and higher educational institutions - grades of stability in gender relations
Статья научная
The family is focused on stabilizing grades in gender relations and educational institutions. Children need to have the knowledge their family needs before they start working. At the same time, the family is focused on stabilizing grades in gender relations and educational institutions. It was emphasized that young people should have the knowledge needed by their families before starting work. The principles of legality, democracy, openness and transparency, and equal rights for women play an important role in ensuring gender equality and mutual understanding. The essence and principles of the OSCE to ensure equality of women are revealed, regardless of race, nationality, language, religion, social origin and faith, as well as personal social status. In the family and in universities, gender culture is ensured, as well as improvement and management of change during the period of study; the line of action to ensure gender-role orientation is aimed at a set of template models. Students must clearly role model one gender or the other.
Бесплатно
Family institute: object and evolution
Статья научная
This article discusses the socio-philosophical, ethnological views of the institution of the family and their evolution as well as the issues that have so far been neglected.
Бесплатно
