bluuebunny/crossref_metadata_2025_split huggingface dataset:
Advanced computer algorithms to simulation of transient dynamics in solids and structures
Authors: Abdukadirov S A 
Published: December 2020

Abstract
The new approach of designing computation algorithms for simulation of transient dynamics in solids and structures is proposed. The algorithms are based on explicit finite-difference scheme built under special conditions imposed on the values of difference mesh parameters. The designed calculation devices possess a minimal influence of spurious effects of numerical dispersion that allows discontinuities and high-gradient components caused by wave fronts and fracture events to be accurately computed. A set of advanced computer algorithms and calculation examples of 1D/2D model and engineering problems are presented: (a) longitudinal impact onto a rod embedded into an elastic medium, (b) propagation of cylindrical and spherical waves with front discontinuities, (c) stress concentrations near a head surface of hard projectile indented into elastic solids and (d) transient wave dynamics and delamination in fiber reinforced composites.
Soil Improvement Using Waste Plastic Bags: A Review Paper
Authors: Iravanian A , Ali Sh 
Published: December 2020

Abstract
Plastic waste is increasing by time that caused huge challenges all over the world. Therefore, there is a need for good ways to solve the environmental challenges. Also, there is another problem which is that many times weak soil faces the projects, the soil needs to be improved. The idea of this paper is to have a thorough review on literature to collect the data on reinforcing soil with waste plastic bags, where the plastic bags strips are reused as a soil stabilizing technique. This solution will be cost effective and eco-friendly and will solve soil weakness problem. This article reviews the works that has been carried out in this issue to find out the functionality of these waste strips as reinforcing material. From this paper the findings were that plastic bags can be used as an effective solution to improve soil strength while being eco-friendly and cost effective. It is noticed that addition of 0-2.5% plastic bags results in getting better property improvements. Regarding the dimensions of the additives it was found that the plastic strips with higher the aspect ratio lead to better test results. Finally, CBR, shear strength parameter and compaction characteristics of stabilized samples were visibly improved comparing to non-stabilized samples.
Performance of One-way Composite Reinforced Concrete Slabs under Explosive-induced Blast Loading
Authors: Anas S M , Alam M , Umair M 
Published: December 2020

Abstract
A finite element model is developed in ABAQUS/CAE to simulate the behavior of one-way reinforced concrete slabs under air-blast loading. Several published empirical equations have been utilized to model air-blast pressure, P(t), for different combinations of the explosive charges and standoff distances. The values of the peak overpressure have been taken from the field explosion tests conducted on four normal reinforced concrete (NRC) slabs of size 2000 mm x 1000 mm x 100 mm in the School of Civil, Environmental, and Mining Engineering, The University of Adelaide, Australia (2009). The slabs were doubly reinforced with HYSD steel re-bars of diameter 12 mm spaced at 100 mm c/c in the major bending plane (ρ = 1.34%) and 200 mm c/c in the other plane (ρ = 0.74%), where “c/c” is the center-to-center distance between two adjacent re-bars. A plasticity-based damage model for concrete and an explicit solver in ABAQUS/CAE are adopted in the finite element (FE) simulation. The available test results and finite element analysis predictions, including maximum mid-span displacement and damage to the RC slabs, are presented and weighed. The computed results are found in good agreement with the experimental ones. The validated model is used to examine the performance of RC slabs with 25% replacement of the conventional steel re-bars by the FRP re-bars of equivalent strength on the compression face only, remote face only, and both faces of the slab. The replacement has been done for higher strength and ductility. Substituted FRP re-bars are of (1) Aramid fiber-reinforced polymer (AFRP), (2) Basalt fiber-reinforced polymer (BFRP), (3) Carbon fiber-reinforced polymer (CFRP), and (4) Glass fiber-reinforced polymer (GFRP). The results are also compared with those obtained with a 50% replacement of the steel re-bars by the FRP re-bars.
Comparative analysis of two gear-lever differential inter-roller transmission mechanisms
Authors: Bahadirov G A , Sultanov T Z , Abdukarimov A 
Published: December 2020

Abstract
A comparative analysis of the kinematics of two gear-lever differential transmission mechanisms is given in this paper. These mechanisms can be used in engineering and agricultural technological roller machines and can solve important technological and agrotechnical problems. The purpose of comparative analysis of gear-lever differential transmission mechanisms is to determine the values and the patterns of gear ratios of the mechanisms with similar geometrical and kinematic parameters; to estimate the additional angular velocities of the driven gear rings of the considered mechanisms depending on geometrical parameters of the mechanisms and kinematic parameters of the driven gear ring, since this additional angular velocitycan lead to geometrical slip between the material being processed and the working rolls. The devices and theoperation principle of the considered mechanisms were described in the paper.First, the levercircuits of the mechanisms were considered. In the lever circuits of the mechanisms, the geometrical parameters of the levers, the position of the lever circuits, as well as the rate and direction of the driving links velocity are known. The kinematic parameters of the lever circuits of the mechanisms were determinedanalytically.Further, using the results of the lever circuits of these mechanisms, the gear circuits of the mechanisms were also investigated analytically. The centroid method was usedin analytical study of the mechanism.The graphs of changes in gear ratios of the mechanisms were plotteddepending on changes in the interaxle distance of the driving and driven links. It was proved that in both gear-lever differential mechanisms under consideration the gear ratio changes with a change in the interaxle distance of the driving and driven links. However, the magnitude of the change in the gear ratio in a gear-lever differential transmission mechanism with a six-link double-circuit lever chain is less than in a gear-lever differential transmission mechanism with a four-link lever chain under the same geometrical and kinematic parameters of the mechanisms.
Effects of agrotechnical and chemical control of weeds in fine-fiber cotton fields
Authors: Dusboev I R , Nasirov B S , Charshanbiev U Y 
Published: December 2020

Abstract
Today, in the world agriculture, especially cotton growing sphere plays an important role in the national economy. In the cultivation of cotton one of the main problems in the fields is weeds. When estimating the damage caused by weeds to cotton fields, it accounted for 75 bln. USD. This scientific article presents data on the effectiveness of pre-and post-application of herbicides against weeds in the areas where the tillage was done with double-toothed plow in the fall before preparing beds in the fine-fiber cotton fields under typical gray soils condition. Effective eradication of annual and perennial weeds (86.8-90.2%) was observed, when a single herbicide Ankosar (3.0, 4.0, 5.0 l/ha) was applied (information of 2017-2019). When the herbicides Step 500 (4.0 l/ha) and Ankosar (4.0 l/ha) were applied consecutively, the effect on annual weeds was noted (90.5-93.0%). Perennial weeds were reduced by 88.9-93.3% when the abovementioned preparations are applied one after another. Cotton yield will increase by 1.8-5.4 c/ha compared to the control variant. It is recommended to apply the herbicides consecutively in the order Ankosar (4.0 l/ha), Step 500 (4 l/ha) and Ankosar (4.0 l/ha) against annual and perennial weeds.
A comprehensive application of fertilizers for growing plantations in forest nurseries: A brief review
Authors: Bahramov R , Mamatyusupov A , Tokhtaboeva F , Khomidov J , Yuldashev H 
Published: December 2020

Abstract
Agricultural sectors must provide, clothe, and feed an increasing world population with energy while mitigating the impact on the atmosphere and on other undesirable factors. The land available to agricultural production in most parts of the world is small. Thus, the only way to increase output is to increase the yield from land currently being used. Crop yields without proper plant nutrition are minimal. Responding to the production challenge in an environmentally friendly manner requires a thorough comprehension of plant nutrition by fertilizers as a component of crop production, which encompasses many critical factors, including improved crop varieties, water management, and integrated pest management, etc. This paper is a state of art on the numerous update and feasible technologies of application of various fertilizers for growing plantations in forest nurseries.
Research of agrochemical and mechanical properties of soils processed with hydrogel
Authors: Sherkuziev D Sh , Aripov Kh Sh , Alimov U K , Maxmudova M A 
Published: December 2020

Abstract
The results of many years of research on the effect of polymer hydrogels for agriculture on soil structure were presented. By sampling soils at various depths, the biological changes of microorganisms that occur under the influence of hydrogels were studied. It was shown that the use of hydrogels leads to an improvement in the basic physicochemical properties of non-irrigated agricultural lands and an increase in soil fertility. The use of hydrogel absorbent on typical non-irrigated lands allowed increasing soil moisture and improving its properties.
Siphon for measuring water at the intake from the tray engineering structures
Authors: Abduraimova D , Ismoilova M 
Published: December 2020

Abstract
Currently, in the context of an increasing shortage of water resources, metering and measurement of water in engineering channel communications is of particular relevance. Especially with water distribution between consumers, there always arises the need for accurate metering of water. This article discusses the issues of water distribution by siphon pipe and determining the actual amount of flow rate. Using the basic equations of hydraulic engineering, a mobile siphon water meter has been developed. The proposed design of the siphon performs two functions: water intake from the trays and water measurement. The paper presents the results of a field study on the use of a siphon water meter for the condition of the tray networks of Uzbekistan. Based on the hydraulic calculation, siphon parameters for abstraction and water measurement are proposed. For each specific case, the siphon throughput is calculated. Water discharge calculation with Siphon determined by vacuum meter a set at the rotating part of it is, depending on the display of the vacuum meter, the water flow rate is determined using the connection diagram of. For this, the graph is built or aggregated graph of. Based on laboratory research, the amount of discharge determined which takes siphon. Based on the research, was obtained a patent from the Intellectual Property Agency for a mobile siphon water meter. By installing this irrigation trays device to the farms through the existing irrigation systems, gotten opportunity to accurately assess the actual water intake and the actual amount of water it receives. According to the results of the work, a graph of the dependence of water flow on pressure is proposed for practical use.
Growth and development of Mung bean (Vigna radiata(L.)) depending on sowing methods
Authors: Ravshanova N A , Usmonov I , Chulliyev A , Isroilov B , Rahimova D , Usmanova Z , Abdumajitov A 
Published: December 2020

Abstract
The article presents the value of the legume crop - mung bean, as a high-protein, nitrogen-fixing, and also gives the results of research work on the study of the influence of the seeding scheme and rate on the growth, development and yield of mung bean (Vigna radiata(L.)). Research results have shown that sowing methods affect the length of the developmental phases, the formation of leaf area, the net productivity of photosynthesis and the yield of mung bean. As a result of an increase or decrease in the seeding rate and changes in the seeding methods, the productivity of plants decreases, and subsequently the yield.
Grinding of the grains according to parameters of hummers in double-staged grinder-crusher
Authors: Astanakulov K D , Fozilov G G , Kurbanov N M , Adashev B Sh , Boyturayev S A 
Published: December 2020

Abstract
Parameters of hummers in double staged grinder-crusher were studied for qualitative grinding of the grains. In order to determine performance indicators, an experimental sample of a grinder-crusher for stepwise grinding of grain was developed. In double stage grinder-crusher when hummers 3-4 mm thick were installed around rotor in 4 rows with 20 mm rotor height the best grinding of the grain was achieved.
The separation of light impurities of safflower seeds in the cyclone of the grain cleaning machine
Authors: Astanakulov K D , Karimov M R , Khudaev I , Israilova D A , Muradimova F B 
Published: December 2020

Abstract
At present, the grain cleaning machines used for cleaning safflower seeds are not effective in cleaning safflower seeds due to the high energy consumption, metal and material content. For this reason, in Uzbekistan an energy and resource-saver grain cleaning machine has been developed which meets the needs of the farms in the cleaning of safflower seeds. When cleaning safflower seeds, the unfamiliar compounds in its content, including 2-3% light impurities should be separated. The quality of safflower seeds cleaning from light impurities depends on the number of fan rotations, the slope and height of the suction pipe and the quenching of the separated light impurities depend on the cyclone parameters. According to the theoretical and experimental studies, light compounds falling into a cyclone with a diameter of less than 20 m/km rise with air and fall with large ones. In addition, the rotation frequency of the fan in the grain cleaning machine is 2200 rpm (air flow rate 5.1 m/s), the height of the suction pipe is 70-130 mm and the slope is in the range of 20-40 degrees and the separation of light impurities of safflower seeds were achieved at around 85 percent.
The implementation of optimized drip irrigation system based on semiconductor sensors
Authors: Sapaev I B , Eshchanova G E , Nullaev U A , Begov F R , Isroilova D A , Babakulova L R 
Published: December 2020

Abstract
This article presents an optimized version of a drip irrigation system based on semiconductor sensors. In this study, the organizational parts of the drip irrigation system based on semiconductor sensors are fully automated, namely: control of the water base, water volume in the pipe, water velocity in the pipe, soil moisture, salinity, temperature, ph of hydrogen content in the soil, pressure regulator valves. The electrical properties of a drip irrigation system based on semiconductor sensors have been proven, on the basis of which a semiconductor material can achieve an optimal result. The system provides economic indicators for one hectare of land and an analysis of the complete replacement of imported products.
Relationship between the concentrations of nitrogen compounds and the water discharge in the Chirchiq River, Uzbekistan
Authors: Karimov B K , Shoergashova S S , Talskikh V N , Salokhiddinov A T 
Published: December 2020

Abstract
The Chirchiq River is one of the most human affected important drinking and municipal water source in the Republic of Uzbekistan. This work aimed to study the level of water pollution in the Chirchiq River by nitrogen compounds (ammonium, nitrite, and nitrate) over the last decade (2008-2018) with the identification of possible correlations between the level of water pollution and discharge. Most common pollutants: ammonium, nitrite, and nitrate concentrations in water were determined using generally accepted photometric methods. Correlation analysis of relationships between the river discharge and the concentrations of these compounds was carried out for each of 9 hydropost for each year and multiyear average values of the ten years (2008-2017). The water quality in the upstream part of the river is evaluated as a very good, however, in mid- and down streams due to diversion of nitrogen-containing organic and inorganic wastewater into the river worsening the water quality abruptly and concentrations exceeding MPC for fishery water bodies up to 5-8 times. Fortunately, according to the [NO3¯]: [NO2¯]: [NH4
+] ratio, the river has still enough assimilation capacity to transform hazardous ammonium and nitrite forms into nitrate nitrogen. Obtained results did not confirm the existence of significant interdependencies between the nitrogen compounds and water discharge. The results of the study will provide a theoretical and practical basis in terms of elucidating the mechanism of hydrochemical transformation of nitrogenous compounds along with the river ecosystem and predicting the dynamics of their concentrations in river water.
Feeding farm animals based on the new innovative total mixed ration (TMR) technology
Authors: Nurmatov A A , Allashov B D , Jabborov Sh Sh , Rustamova I , Tursunov Sh 
Published: December 2020

Abstract
The main part of the meat products produced in the country is beef. Currently, the number of cattle is over 12 million, of which 94% are livestock, and 90% are meat products. The efficient use of livestock feed plays an important role in improving digestion and increasing productivity. Feeding the animals with Korean total mixed ration (TMR) technology leads to improved feed efficiency and, at the same time, increased productivity. In this regard, research work on the application and implementation of TMR technology in farms of the population of Uzbekistan for cattle is relevant. This article presents the results of studies of feeding using Korean technology in households.
Study on industrial applications of papain: A succinct review
Authors: Shouket H A , Ameen I , Tursunov O , Kholikova Kh , Pirimov O , Kurbonov N , Ibragimov I , Mukimov B 
Published: December 2020

Abstract
Papain is an enzyme having proteolytic function with cysteine protease activity obtain from papaya having green color and is acquired from latex. It is classified in superfamily. Papain has function essential of proteolysis widely for peptides of amino acid in all living beings. Present review shed light on general properties, structuring features and biological importance of papain, especially its industrial applications for different purposes, which includes food, Pharmaceuticals, Breweries, leather, meat, detergent and other fields, with the help of technological advancement; it is now used to treat lethal diseases and additionally scientist’s are taking benefit of it for drug designing so there are high demands for its export. Papain uncommon properties have been making it more appreciable commercially. Papaya is present or grows in all tropical areas as there are no seasonal limitations for its growth and papain is resistant over wide range of Ph and temperature, so it has high demand for export and there is good prospect of papain marketing. Farmers at lower levels could use this enzyme as high source of income. Through recombinant DNA technology, engineering of proteins and procedures of immobilization papain could be ideal for biotechnological and industrial applications. Researchers could explore more potent applications by understanding detail mechanism and functions of papain. Then there will be novel papain function that would fulfill the massive need for betterment of life.
Fabrication processes and testing of the moderator for irradiating devices of BN reactors. Testing of the moderator
Authors: Polunin K K , Mokrushin A A 
Published: December 2020

Abstract
The work presents the results of studies of zirconium hydride used as the moderator for irradiating devices in fast reactors. Zirconium hydride fabrication process using methods of direct saturation of the source material and powder preparation and compacting has been optimized. Hydrostatic method was used to measure density of the samples: for the samples produced by direct saturation density varies within 5.61 to 5.65 g/cm3, for compacted zirconium hydride - 5.45 to 5.55 g/cm3. Tests to evaluate hydrogen release from zirconium hydride have been conducted. It has been shown that dehydration onset temperature is (420 – 450) °C (powder compaction method) and (500 – 550) °C (direct saturation method). It has been noted that in 20 minutes of the sample heating from 500 to 900 °C, the mass fraction of the hydrogen released is 0.6 %. The results acquired confirm the data on diminished thermal stability of zirconium hydride produced by the powder method in gaseous media.
Investigation of a brazed joint EK-181/V/W obtained by Cu-Sn and Cu-Ti amorphous foils
Authors: Bachurina D , Suchkov A , Gurova Y , Sevryukov O 
Published: December 2020

Abstract
The work presents the results of high temperature brazing of reduced activated ferritic martensitic steel EK-181 with pure tungsten, which is essential for DEMO fusion reactor. Vanadium interlayer was used to reduce thermal stresses. Brazing alloys to be used were rapidly quenched into ribbons Cu-12Sn, Cu-20Sn, Cu-12Sn-0,4P for EK-181/V, Cu-50Ti for V/W. Microstructure investigations, mechanical and thermocycling test were carried out.
Investigation on the structure of beryllium composite containing nanodiamonds
Authors: Kozlova E , Sheverdyaev M , Gorlevsky V , Semenov A , Laushkin A , Chebotarev A , Anikin A 
Published: December 2020

Abstract
The article presents the results of research of the structure of advanced beryllium composite materials for use in X-ray and synchrotron technology. The technique of acquiring beryllium composite containing nanodiamonds is described. The investigation on the structure was carried out using the scanning electron microscope microanalyzer Philips XL-30. The spectral analysis of composites was carried out using an energy-dispersive spectrometer with a Sapphire detector.
Application of 3d technologies for microwave range electronic components creating
Authors: Gadzhiev Kh , Gadzhieva S , Chelushkina T 
Published: December 2020

Abstract
This paper presents the results of the study of microwave radio-electronic components electrophysical parameters manufactured on a 3D printer. Laser sintering technologies for metal semiconductor and ceramic powders were used as experimental research methods. The resonant properties of one-sided surfaces in the form of a Mobius sheet made on the 3D printer are analyzed. An explanation of a traveling and standing wave formation in the oscillatory contours of the microwave range of one-sided surfaces in the form of a Mobius sheet is presented. The possibility to create digital active phased antenna arrays based on onesided surfaces in the form of a Mobius sheet is shown.