scholarly journals The theoretical approaches for calculation of the vertical effective pressure of drop impact of artificial rain on soil and hard surface

2016 ◽  
Vol 1 ◽  
pp. 16-20
Author(s):  
Bryl S.V. ◽  
Zverkov M.S.
Keyword(s):  
Solid Surface ◽  
Land Reclamation ◽  
Effective Pressure ◽  
Pressure Drops ◽  
Impact Performance ◽  
Theoretical Approaches ◽  
Rain Drops ◽  
Artificial Rain ◽  
Newton’S Laws ◽  
The Impact

The article considers the problem of calculating the vertical effective pressure drops of artificial rain on soil and hard surfaces. It is noted that the problem of determining the effective vertical pressure p of rain drops on soil although it is difficult, however, has a solution using Newton’s laws. This issue V.V. Slastenin, G. and A.P. Isaev, V.M. Moskovkin and V.F. gahs, etc., and N scientists. Erowyn S. , M.B. Lebedev, V.I., Gorodnichev, etc. proposed different approaches for determining the pressure p in terms of land reclamation (artificial irrigation). These issues dealt with and foreign researchers. Selected according to, according to the authors, the most suitable for the study of impact of the drops of artificial rain with the help of the patented device, and also to compare the obtained results with those of researchers dealing with the drip of erosion and determining the impact performance characteristics of droplets on a solid surface.

The methodological approach for the determination of the pressure of artificial raindrops as a question of the theory of splash soil erosion

2020 ◽  
pp. 24-28
Author(s):  
Mihail Zver'kov
Keyword(s):  
Block Diagram ◽  
Methodological Approach ◽  
Control Measures ◽  
Soil Conditions ◽  
Effective Pressure ◽  
Long Distance ◽  
Splash Erosion ◽  
Rain Drops ◽  
Artificial Rain ◽  
The Impact

To the article the results of the theoretical and experimental researches are given on questions of estimates of the dynamic rate effect of raindrop impact on soil. The aim of this work was to analyze the current methods to determine the rate of artificial rain pressure on the soil for the assessment of splash erosion. There are the developed author’s method for calculation the pressure of artificial rain on the soil and the assessment of splash erosion. The study aims to the justification of evaluation methods and the obtaining of quantitative characteristics, prevention and elimination of accelerated (anthropogenic) erosion, the creation and the realization of the required erosion control measures. The paper considers the question of determining the pressure of artificial rain on the soil. At the moment of raindrops impact, there is the tension in the soil, which is called vertical effective pressure. It is noted that the impact of rain drops in the soil there are stresses called vertical effective pressure. The equation for calculation of vertical effective pressure is proposed in this study using the known spectrum of raindrops. Effective pressure was 1.4 Pa for the artificial rain by sprinkler machine «Fregat» and 5.9 Pa for long distance sprinkler DD-30. The article deals with a block diagram of the sequence for determining the effective pressure of rain drops on the soil. This diagram was created by the author’s method of calculation of the effective pressure of rain drops on the soil. The need for an integrated approach to the description of the artificial rain impact on the soil is noted. Various parameters characterizing drop erosion are considered. There are data about the mass of splashed soil in the irrigation of various irrigation machinery and installations. For example, the rate (mass) of splashed soil was 0.28…0.78 t/ha under irrigation sprinkler apparatus RACO 4260–55/701C in the conditions of the Ryazan region. The method allows examining the environmental impact of sprinkler techniques for analyzes of the pressure, caused by raindrops, on the soil. It can also be useful in determining the irrigation rate before the runoff for different types of sprinkler equipment and soil conditions.

scholarly journals Influence of unevened grains of metal on the mechanical properties of seamless hot – rolled pipes.

2020 ◽  
pp. 31-33
Author(s):  
I. A. Kovaleva ◽  
N. A. Khodosovskaya ◽  
M. V. Oborov
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Physical And Mechanical Properties ◽  
World Market ◽  
Grain Structure ◽  
Pressure Drops ◽  
Impact Performance ◽  
Hot Rolled ◽  
The Impact

Seamless hot – rolled pipes are a popular metal product on the world market. During operation, pipelines are subjected to cyclic loads associated with temperature fluctuations, vibrations near compressor stations, and pressure drops in the transformed medium. One of the ways to ensure high performance properties is to manage the quality of pipe metal, including that laid in the process of metallurgical production. All the basic physical and mechanical properties of metal materials are structurally sensitive and significantly depend on both the grain size and the degree of uniformity of the grain structure, that is, on the different grain sizes. For metallographic research, samples of pipes with the size of 70,0×12,5 mm of S460NH steel were selected with satisfactory (#1) and unsatisfactory (#2) results of the impact. It was found that the inhomogeneous (multi – grained) microstructure in sample #2 was the reason for obtaining unsatisfactory results of the impact. As a result, it was found that one of the most important characteristics that can guarantee stable and satisfactory results of mechanical characteristics, in particular the impact performance, is a homogeneous grain structure.

Economic behavior of households and their welfare: models and forms of interaction

2020 ◽  
pp. 3-8
Author(s):  
Maryana Bil ◽  
Olha Mulska
Keyword(s):  
Economic Growth ◽  
Social Protection ◽  
Well Being ◽  
Central Place ◽  
Economic Behavior ◽  
Human Potential ◽  
Modern Theory ◽  
Economic Behaviour ◽  
Theoretical Approaches ◽  
The Impact

The article defines the content of welfare as a measure of socially oriented efficiency of economic growth, which reflects the appropriate level of providing the population with material and spiritual goods with the formation of favourable conditions for human development and capitalization of human potential in a competitive mobile space. The modern theory of welfare testifies to the deepening of scientific discussions on the transformation of economic welfare into mobile and inclusive, as well as the opposition of competitive and social protection welfare policy. Another milestone in the evolution of welfare theory is the individualization of its provision. Conditions of competition and mobility increase the importance of households in providing their well-being with further reflection on the processes of economic growth of the community, region, and state. This gives grounds to actualize the issues of household welfare research and strengthening economic growth based on behavioural economics. The needs, interests, motives, and incentives determine the economic behaviour of households. At higher levels, it defines an economic culture that is closely linked to the national mentality. In this regard, the main models of economic and social behaviour of households – socialization, adaptation, integration, values, regulation, and the definition of financial development strategies are outlined. Theoretical approaches to the explanation of economic behaviour are generalized, namely religious-ethical, psychological, substantive theories, theories of motivations and acquired needs, process theories, theories of justice, and others. Based on the ideas of foreign scientists, the main determinants of the economic policy of households are proposed. Political, stabilizing, and economic determinants are distinguished in the group of general determinants. In the group of determinants directly related to households, the financial, demographic, cultural, social, empirical, and psychological are suggested. The author’s emphasis is placed on the importance of the impact of financial determinants of the households’ economic behaviour, the central place among which is occupied by savings.

scholarly journals Numerical simulation of the impact of an integrated renovation project on the Maowei Sea hydrodynamic environment

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Cui Wang ◽  
Ling Cai ◽  
Yaojian Wu ◽  
Yurong Ouyang
Keyword(s):  
Water Exchange ◽  
Land Reclamation ◽  
Three Dimensional ◽  
Exchange Capacity ◽  
Reclamation Project ◽  
Hydrodynamic Environment ◽  
Sea Area ◽  
Water Quality Models ◽  
The Impact ◽  
Main Factor

AbstractIntegrated renovation projects are important for marine ecological environment protection. Three-dimensional hydrodynamics and water quality models are developed for the Maowei Sea to assess the hydrodynamic environment base on the MIKE3 software with high resolution meshes. The results showed that the flow velocity changed minimally after the project, decreasing by approximately 0.12 m/s in the east of the Maowei Sea area and increasing by approximately 0.01 m/s in the northeast of the Shajing Port. The decrease in tidal prism (~ 2.66 × 106 m3) was attributed to land reclamation, and accounted for just 0.86% of the pre-project level. The water exchange half-life increased by approximately 1 day, implying a slightly reduced water exchange capacity. Siltation occurred mainly in the reclamation and dredging areas, amounting to back-silting of approximately 2 cm/year. Reclamation project is the main factor causing the decrease of tidal volume and weakening the hydrodynamics in Maowei Sea. Adaptive management is necessary for such a comprehensive regulation project. According to the result, we suggest that reclamation works should strictly prohibit and dredging schemes should optimize in the subsequent regulation works.

scholarly journals Impact Resistance of Epoxy Composites Reinforced with Amazon Guaruman Fiber: A Brief Report

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2264
Author(s):  
Raphael H. M. Reis ◽  
Fabio C. Garcia Filho ◽  
Larissa F. Nunes ◽  
Veronica S. Candido ◽  
Alisson C. R. Silva ◽  
...  
Keyword(s):  
Fiber Composite ◽  
Impact Resistance ◽  
Fiber Composites ◽  
Epoxy Composites ◽  
Impact Performance ◽  
Electron Microscopy Analysis ◽  
Ballistic Properties ◽  
Microscopy Analysis ◽  
Izod Impact ◽  
The Impact

Fibers extracted from Amazonian plants that have traditionally been used by local communities to produce simple items such as ropes, nets, and rugs, are now recognized as promising composite reinforcements. This is the case for guaruman (Ischinosiphon körn) fiber, which was recently found to present potential mechanical and ballistic properties as 30 vol% reinforcement of epoxy composites. To complement these properties, Izod impact tests are now communicated in this brief report for similar composites with up to 30 vol% of guaruman fibers. A substantial increase in impact resistance, with over than 20 times the absorbed energy for the 30 vol% guaruman fiber composite, was obtained in comparison to neat epoxy. These results were statistically validated by Weibull analysis, ANOVA, and Tukey’s test. Scanning electron microscopy analysis disclosed the mechanisms responsible for the impact performance of the guaruman fiber composites.

scholarly journals Air mediates the impact of a compliant hemisphere on a rigid smooth surface

Soft Matter ◽  
2021 ◽  
Author(s):  
Siqi Zheng ◽  
Sam Dillavou ◽  
John M. Kolinski
Keyword(s):  
Elastic Body ◽  
Elastic Properties ◽  
Impact Velocity ◽  
Solid Surface ◽  
High Speed ◽  
Smooth Surface ◽  
High Speed Imaging ◽  
The Impact ◽  
Rigid Smooth

When a soft elastic body impacts upon a smooth solid surface, the intervening air fails to drain, deforming the impactor. High-speed imaging with the VFT reveal rich dynamics and sensitivity to the impactor's elastic properties and the impact velocity.

scholarly journals Ultrahigh Ballistic Resistance of Twisted Bilayer Graphene

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 206
Author(s):  
Qing Peng ◽  
Sheng Peng ◽  
Qiang Cao
Keyword(s):  
Weight Ratio ◽  
High Strength ◽  
Bilayer Graphene ◽  
Energy Propagation ◽  
Dynamic Simulations ◽  
Protective Material ◽  
Impact Performance ◽  
Ballistic Resistance ◽  
Twisted Bilayer Graphene ◽  
The Impact

Graphene is a good candidate for protective material owing to its extremely high stiffness and high strength-to-weight ratio. However, the impact performance of twisted bilayer graphene is still obscure. Herein we have investigated the ballistic resistance capacity of twisted bilayer graphene compared to that of AA-stacked bilayer graphene using molecular dynamic simulations. The energy propagation processes are identical, while the ballistic resistance capacity of the twisted bilayer graphene is almost two times larger than the AA-bilayer graphene. The enhanced capacity of the twisted bilayer graphene is assumed to be caused by the mismatch between the two sheets of graphene, which results in earlier fracture of the first graphene layer and reduces the possibility of penetration.

Curbing electronic shopper perceived opportunism and encouraging trust

2017 ◽  
Vol 117 (10) ◽  
pp. 2210-2226 ◽  
Author(s):  
Sonia San-Martín ◽  
Nadia Jimenez
Keyword(s):  
Information Asymmetry ◽  
Structural Equation ◽  
Design Methodology ◽  
External Quality ◽  
Content Type ◽  
Theoretical Approaches ◽  
Quality Signals ◽  
The Impact ◽  
Relevant Factors ◽  
Analyze Data

Purpose Consumers can face a situation of information asymmetry in electronic shopping (ES). The purpose of this paper to examine the relationships between: relational variables such as satisfaction, trust and perceived opportunism; and website cues (cognitive signals such as security and personalization, and experiential signals, such as design and entertainment). Design/methodology/approach The paper opted for the structural equation methodology to analyze data collected from 447 Spanish e-shoppers. Findings Results show different factors that relate to satisfaction, trust and perceived opportunism in ES. Satisfactory experience with ES and entertainment emerge as the most relevant factors to achieve trust and prevent perceived opportunism in e-commerce. Originality/value The five contributions of this study are: the introduction of variables from several theoretical approaches to the study of an agency problem in e-commerce; the study of different ways to gain buyer trust and reduce perceived opportunism in an electronic shopper-vendor relationship; the application of signaling theory as part of the process of helping the principal (e-shopper) to solve their shopping problem in a context of information asymmetry; the analysis of the impact of external cues from e-vendor/site, which allows for a comparison between internal experiences and external quality signals; and the study of entertainment as an important hedonic variable in order to have satisfied and confident e-shoppers.

Effects of Manufacturing Tolerances on Regenerative Exchanger Number of Transfer Units and Entropy Generation

2005 ◽  
Vol 128 (3) ◽  
pp. 585-598 ◽  
Author(s):  
Wei Shang ◽  
Robert W. Besant
Keyword(s):  
Entropy Generation ◽  
Flow Channel ◽  
Operating Conditions ◽  
Channel Diameter ◽  
Pressure Drops ◽  
Entropy Generation Number ◽  
Compact Heat Exchangers ◽  
Prime Concern ◽  
Manufacturing Tolerances ◽  
The Impact

A prime concern with the design of ultra-compact heat exchangers is the impact on performance of flow channel variations due to flow channel hydraulic diameter variations caused by manufacturing tolerances. This paper uses analytical methods to show that as the standard deviation in flow channel sizes, caused by manufacturing tolerances in a rotary regenerative exchanger, is increased compared to the average flow channel diameter the effective number of transfer units decreases. Depending on the operating conditions, the entropy generation number either increases or decreases with increasing flow channel size variations. These findings extend previous findings that showed that flow channel variations cause lower pressure drops and effectiveness.

THEORIES OF REGIONAL DEVELOPMENT AS A METHODOLOGICAL BASIS FOR THE FORMATION OF RUSSIA'S REGIONAL POLICY

2021 ◽  
Author(s):  
Наталия Александровна Иванова
Keyword(s):  
National Economy ◽  
Global Financial Crisis ◽  
Systematic Research ◽  
Macroeconomic Conditions ◽  
Theoretical Approaches ◽  
Territorial Structure ◽  
Territorial Organization ◽  
The Global Financial Crisis ◽  
The Impact

Актуальность исследования для экономики усиливается такими явлениями, как влияние мирового финансового кризиса, усложнение отраслевой и территориальной структуры производства, усиление интеграции всех сфер общественной жизни, возрастание значения экологических, социальных и политических факторов развития общества, повышение трансакционных издержек принятия решений в сфере управления. Изучение литературы о территориях дает основание определить понятие региональной системы России как элемент, подсистему некоторой иерархической системы, в роли которой выступает национальная экономика. Процессы глобализации коренным образом изменяют роль регионов в национальной экономике. Регион постепенно становится не только отдельным экономическим агентом, но также вступает в мировые конкурентные процессы. Положение территориально-организованных систем оказывается зависимым не только от макроэкономических условий или возможностей самих регионов, но также от расстановки конкурентных сил, механизмов взаимодействия регионов с другими субъектами. В этой связи возникает необходимость системных исследований с целью выработки комплекса мер, которые будут способствовать повышению конкурентоспособности экономики в целом, ее регионов в частности. Существующий инструментарий региональной экономики является уже недостаточным для анализа такого рода проблем, а традиционный конкурентный анализ не рассматривает регионы в качестве субъектов конкуренции. Требуется расширение и применение новых теоретических подходов к анализу региональных экономических систем и эффективности их развития, формированию целостной концепции развития территориальной организации хозяйства, что обусловило актуальность данного исследования. The relevance of the study for the economy is enhanced by such phenomena as the impact of the global financial crisis, the complication of the sectoral and territorial structure of production, the strengthening of integration of all spheres of public life, the increasing importance of environmental, social and political factors in the development of society, the increase in transaction costs of decision-making in the field of management. The study of the literature on territories gives grounds to define the concept of the regional system of Russia as an element, a subsystem of some hierarchical system, in the role of which the national economy acts. The processes of globalization are fundamentally changing the role of regions in the national economy. The region is gradually becoming not only a separate economic agent, but also enters into global competitive processes. The position of geographically organized systems turns out to depend not only on the macroeconomic conditions or the capabilities of the regions themselves, but also on the alignment of competitive forces, the mechanisms of interaction of regions with other entities. In this regard, there is a need for systematic research in order to develop a set of measures that will contribute to improving the competitiveness of the economy as a whole, its regions in particular. The existing tools of the regional economy are no longer sufficient to analyze such problems, and traditional competitive analysis does not consider regions as subjects of competition. It requires the expansion and application of new theoretical approaches to the analysis of regional economic systems and the effectiveness of their development, the formation of an integral concept of the development of the territorial organization of the economy, which determined the relevance of this study.

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