bluuebunny/crossref_metadata_2025 huggingface dataset:
Statistical Analysis of CFRP Mechanical Properties using B-Basis Based on Weibull and ANOVA Distribution Analysis
Authors: Yurviany  , Tamaza Diaz , Widagdo Djarot , Kusni Muhammad , Hadi Bambang K.
Published: July 2020

In this paper, the mechanical properties of composite materials are subjected to statistical analysis. This study aimed to determine the value of B-Basis strength parameters of carbon composite material with UD-00, UD-900, fabric-00, fabric-900 from the results of tensile and compression tests. The maximum normal residual test was used for outlier identification and k-sample Anderson’s darling test to determine whether parameters can be processed as one large group of data. The scope of this study focused on evaluating B-Basis values using two methods: Weibull and ANOVA. The results showed that Weibull distribution method could be applied to analysis the data and produced a confidence level of 95%. ANOVA method however, could not be applied to specific data which were the tensile strength of UD 00 with a non-tabbing treatment. This was due to the inhomogeneous of the data.
Assessing the potential of delivery consolidation to campus center
Authors: Santoni Alfiora , Dr. Ir. Nahry M.T , Abdullah Dr. Sarini , Stats M.
Published: July 2020

The purpose of this research is to investigate the characteristics of students who partake in online shopping and the potential of the consolidation method for delivering packages in Universitas, Indonesia (UI). The consolidation method for delivering packages is considered a solution for reducing freight volume and its negative impact on the environment. The study was based on the interview of 1824 UI students regarding their preferences on two package delivery services used in online shopping, namely direct (home) delivery and consolidation. The data was analyzed using the Analytical Hierarchical Process method and Expert Choice 11. The result shows that 56% of the students experienced problems in online shopping, with 46% experiencing a delayed delivery. Compared to the direct delivery, 51.3% of the students chose the consolidation method. In general, the most important aspect of choosing a delivery method when shopping online is time (24.7%), convenience (23.3%), accessibility (22.5%), cost (16.4%), and distance (13.2%). For those who choose direct delivery, time is the most important aspect; for those who choose consolidation, convenience in using the system and accessibility to the consolidation point are the most important. These should be taken into account in implementing the system in the UI campus so the campus can share benefits by reducing the negative impact of freight transport on the environment.
Determination Of Priority Criteria Which Influences CPO Factory Productivity
Authors: Sembiring Nurhayati , Imam Ramzani M.
Published: July 2020

One of the factor in a company’s competitiveness is productivity, and each company expects to have high productivity. However, the reality on the ground of performance is not necessarily in line with company expectations. The purpose of determining priority criteria using the Analytical Network Process method is to rank the known CPO mill productivity criteria. Based on the calculation results, there are three perspectives on the perspective of identifying factors of productivity in palm oil processing factories, namely: the quality of oil palm fruit, palm fruit processing machines and labour skills. Then for the ranking of sub-criteria, the highest priority productivity criteria for palm oil processing factories with the ANP method are the quality criteria for FFB, followed by the criteria of labour skills, and the criteria for processing machinery. The Mature Fruit Quality sub-criteria based on ANP method calculation are the most dominant, followed by the Working Hours, Work Experience, Transportation, Harvest Technology, Machine Hours, Fruit Origin, Types of Technology Used, and Education / Training.
Analysis Improvement Production Process Of Making Joint Care Air Filter Mitsubishi (Cjm) With Overall Equipment Effectiveness And Six Big Losses
Authors: Nurmutia Syahreen , Candra Adi , Shobur Muhammad
Published: July 2020

The performance measurement studies have been performed the method of Overall Equipment Effectiveness. To know the losses that occur in the production process is carried out by the methods of analysis of the Six Big Losses. To find out the cause dominant done with fishbone diagrams, Nominal Group Technique and scatter diagram. The results will be the basis of recommendation improvements to decrease downtime and increase the value of the effectiveness of the company’s production machine by performing the calculation of OEE after repair. Objects are examined in this research is the engine Room Temperature Oven Curring for CJM air filter production process. The data used is data one year i.e. January 2017–December 2017 retrieved value Overall Equipemnt effectiveness. Value does not meet the ideal of OEE that is above 85%, machine down time occurs high in February 2017. The results of availability ratio between 66.29%-98.91% derived from the calculation of the loading time for the month of january of 314 hours and the factor cause downtime is machine break, trouble dies, material delay, delay forklifts and set up the operation, calculation time for the month of january 2017, this happens because the speed of production machines is not working optimally.
Redesign Layout Planning of Raw Material Area and Production Area Using Systematic Layout Planning (SLP) Methods (Case Study of CV Oto Boga Jaya)
Authors: Bintang Bagaskara K. , Gozali Lina , Widodo Lamto
Published: July 2020

CV Oto Boga Jaya (Oto Bento) is one of the largest industries which is producing Japanese food that is located in Bogor City and has many franchise partners throughout Indonesia. CV Oto Boga Jaya has the most significant problem and complained by most employees and operators (interview results) is a matter of factory layout between the raw material warehouse and the production area where the position of the two departments has an excess of more than 29 meters and takes time more than 10 minutes for one move. Therefore, researcher conducted observations and data processing with systematic layout planning (SLP) methods to design a new factory layout for CV Oto Boga Jaya. The processed data is the Operation Product Chart (OPC) data by selecting the product that has the highest and longest production process named shrimp roll, routing sheet, material handling costs, and initial layout as a reference. Then after conducting the research, the results obtained are in the form of 2 alternative layouts with distances and positions of different departments that have been processed in the FTC, ARC, ARD, AAD. The results of this study were chosen alternative layout 2, because it has shorter inter-departmental distances, a more orderly production / administration process, and fewer room intersections compared to alternative layout 1.
BCube and DCell Topology Data Center Infrastructures Performance
Authors: Surya Negara Edi , Keni Keni , Andryani Ria
Published: July 2020

Data Center (DC) quality is if it can provide optimal service. Optimal service means that the access provided should be free from interference. Interference can come from outside the system or from within the system itself. One of the variables used to measure the performance of data center architecture is a routing protocol. Routing Information Protocol is a variable to measure performance on BCube and DCell topologies. Testing is done using a simulator that can produce information architecture that has the best performance when communicating from the server to the client. BCube is a server-centric network structure, while DCell is a recursively defined architecture. This study was conducted to compare the two data center topologies with experimental methods. The results show that DCell has a better speed in data transmission. However, when viewed from the side of security and integrity of BCube delivery much better, this is because BCube is able to send data completely without any failure or inhibition in the delivery.
Web-based application as a communication modeling for street children
Authors: Widiastiwi Yuni , Zaidiah Ati , Hesti Indriana Intan
Published: July 2020

Effective communication is one of the keys success factor in implementing an activity, a common problem that often occurs in social communities problem of street children is the ineffective communication process each community stands alone without any mutual coordination. The purpose of this study is to model the process of communication between social communities utilizing a web-based application, using the waterfall approach for application design. The expected results of this study are as a forum to facilitate communication between existing social communities. The existence of communication applications between street children communities can help to optimize the communication function so that the implementation of various activities that can help target the implementation of activities can run better and on target.
Online product search using gray level co-occurrence matrix, color moments, and histogram of oriented gradients for content based image retrieval
Authors: Halim Henry , Hendryli J , Herwindiati D E
Published: July 2020

Usually an information retrieval system uses text as its query for retrieving the results. However, the system can also use images, as opposed to text, for the search query. This technique commonly is called content based image retrieval. In this paper, we explore the retrieval of fashion products such as hats, sneakers, t-shirts, flat shoes, and dresses from images using color, texture, and shape features to represent the characteristics of the query images. The color, texture, and shape features are color moments, gray level co-occurrence matrix, and histogram of oriented gradients, respectively. The feature extraction process produces vectors with statistical feature value which can then be clustered to retrieve images with high degree of similarity. Comparing those feature representations for the retrieval system, it is shown that shape feature is the best representation.
Development of wood carving furniture technology in Jepara
Authors: Supriyatna Marizar Eddy , Widya Mutiara Maitri , Purna Irawan Agustinus
Published: July 2020

The majority of wood carving technology in Jepara is still conventional. The production process is done traditionally and manually (handmade), especially in wood carving that is applied to furniture. The impact is the production process becomes slow and the quality of the product cannot be achieved optimally. Optimization of production is needed to match the demands of the export market. Therefore, production technology is needed to meet the wants and needs of the export market. In this context, wood carving furniture that is designed for the export market should be realized with mass-processed machine technology solutions. The current development in Jepara that is happening is the production process in a modern way, but the product does not use carvings or decoration. Though wood carving can be made using a CNC router. Thus in the era of globalization, the development and design of wood carving furniture production technology in Jepara should properly use processes based on modern technology, machinery, skills, and mind-set changes as industrial products, including the development of human resources. In this case: training, coaching and mentoring should be done continuously, both by the government, universities and associations. This qualitative research uses a multidisciplinary approach, namely: technology, marketing, and design.
Emergency Shelter Design For Disaster Preparation
Authors: Mounaim Abdel , Widayati Priyomarsono Naniek , Trisno Rudy
Published: July 2020

Indonesia is geographically a country located in an area that is often subject to natural disasters. As a result of natural disasters that damaged residents homes, many people lost their homes and needed temporary shelter to evacuate. However, shelters in practice are often inappropriate and have poor quality and are late or come in damaged condition. The purpose of this study is to develop an emergency shelter spatial design that functions for disaster emergencies. In this study the method used is a qualitative research method with a descriptive approach, this method aims to describe the conditions that currently apply, in order to understand more deeply the needs of disaster victims who are displaced in shelters that are currently being used in the field. Based on several theories used, conclusions will be drawn to become a tool in the analysis. The objects to be observed are several emergency shelter units that were used in the latest disaster, the disaster in Palu, Information and data will be obtained through interviews and field observations accompanied by documentation. This research shows that emergency shelters currently in the field do not yet have spatial functions that can fulfill activities and accommodate disaster victims’ activities well. The results of this study are three alternative plans that have been adapted to the needs of space and function in accordance with the activities and activities of disaster victims in Palu in order to create the expected comfort and privacy. Suggestions for layout and emergency shelter space requirements are manifested in the form of tables and floor plans.
Dynamics Of Land Value Change : A Case Of Pantai Mutiara, Jakarta
Authors: Loi Juntrisnawati , Tresani Nurahma , Mahmud Nasiruddin
Published: July 2020

City continues to experience physical development as indicated by the increasing number of built up areas and increasing land requirements. Physically, land is an asset that has limitations and cannot grow, for example through reclamation efforts. Land is not only a wealth-creating resource for sustenance but also the basic resource requirement for all development. Pantai Mutiara area is a coastal reclamation area intended for residential functions. The development of the Pantai Mutiara Area reclamation project from the beginning of the development to the present has had an impact on the increase in the land value in the area, especially the land value that has marinas and docks. The dynamics of land values changes are still unpredictable especially because the determinants of land value itself are not just something real like accessibility, location, etc., but there are also determinants of land value such as macroeconomic conditions (gross domestic product, economic growth, Indonesian Rupiah exchange rates and currency conversion).
Smart Chicken Farming: Monitoring System for Temperature, Ammonia Levels, Feed in Chicken Farms
Authors: Budiarto Raden , Kholis Gunawan Nur , Ari Nugroho Bagas
Published: July 2020

In this study, embedded system technology was implemented in the supervision system of chicken farms. This system works by utilizing sensors that are used to collect data on temperatures, ammonia levels, chicken food in the chicken coop. The method used in this study consisted of three stages. The first stage is a literature study on problems that often occur in chicken farms. The second step is to make observations directly to the farm to get more information. Then proceed with the implementation and testing. The research data were collected through observations and interviews with breeders on chicken farms, Bogor district. The results of the study show that the system can monitor ammonia levels, chicken food weight, and room temperature. The farmer can easily monitor the condition of chicken farms and get SMS notifications on situations that need to be dealt with immediately. The research data were collected through observations and interviews with breeders on chicken farms, Bogor district. The results of the study show that the system can monitor ammonia levels, chicken food weight, and room temperature.
The concept of creating a new water management system in the region
Authors: Rakhmatov N , Maksudova L , Jamolov F , Ashirov B , Tajieva D
Published: July 2020

The article gives the reason for the formation of Lake Aydarkul, according to which Lake Aydarkul began to form, starting from the catastrophically high year of 1969 - as a result of the discharge of 21 cubic kilometers of Syrdarya waters from the Shardara reservoir. The area of the lake system reached 2000 km2, salinity of water – 2 – 4 g/l. In the next decade, there was a drop in the water level in the lakes and deterioration in its quality. By 1978, the depth decreased from 25 to 20 meters, and salinity increased to 7-8 g/l. An analysis of the available materials devoted to this problem showed that the water surface of Aydar and Tuzkan lakes extends from west to east for more than 180 kilometers, and the adjacent chain of Arnasay lakes stretches from north to south for more than 70 kilometers. The reason for the salinity of Aydarkul was indicated - before the commissioning of the Shardara reservoir, salt lakes were located on the site of the lakes, and only in the Tuzkan Basin fed by the Kly River was a shallow salt lake. The problem can be solved by transporting an additional volume of water to the lower reaches of the Amudarya, which will improve the ecological situation in the Aral Sea region, provide, over time, the formation of fresh lakes and create a water management system Syrdarya - Aydarkul - Zarafshan - dead lakes - Amudarya. This system can serve the broad development of fisheries, and also contribute to the opening of new agricultural areas of the republic, while creating several hundred new jobs. A method is recommended for solving an important national economic task of the industry. It is proposed that for the formation of the water system Syrdarya – Aydarkul - Zarafshan - “dead lakes” – Amudarya – Priaralye, it is necessary to design and build the main canal with several sections of a length of about 250 km, each of which communicates with the lake of the above system, will provide gravity communication of three large rivers of the Aral Sea basin. It is proposed to design the main canal with improved lining, which will provide high efficiency, which, in turn, will reduce the filtration coefficient and contribute to an increase in water intake for the needs of the national economy, expansion of irrigated areas and the development of fisheries in the region, and improvement of the ecological situation in the Aral Sea region.
Risk management of construction
Authors: Saidova M , Xodjimuxamedova Sh , Uktamov K
Published: July 2020

The role of financial risk management in increasing the financial stability of a construction company and reducing the likelihood of losses related to non-core risks is very large. The ability to identify and assess risks, as well as understand how possible adverse events can affect the final financial result, increases the manageability of the company’s asset portfolio and the predictability of the financial results of its business activities.

Any company is exposed to business risks. Its incomes may rise or fall depending on changes in the environment, competition, production function, due to the emergence of new technologies, or changes in factors affecting consumer preferences. It should be noted that in Uzbekistan, unfortunately, financial risk management has not yet begun to play that significant role in the field of developing management decisions that it plays in the West. Due to historical circumstances, the development of financial risk management began in our country later than in the West, in fact, like the Uzbek business itself.

An important role is played by the fact that the risk management system cannot simply be copied from a Western standard and imposed on Uzbek companies. There is no doubt that risk management in our country is not just different, but also must be different from risk management in Western companies due to the Uzbek specificity. And this is not only about the liquidity of foreign exchange markets, but also about the needs to design an Uzbek risk management model with the possible use of existing tools and taking into account the experience of Western companies.

The purpose of this article is to develop recommendations on risk management in times of crisis for construction companies.

The results obtained from the research can be implemented in the activities of construction companies and used in educational methods.
The dynamics of channel processes in the area of damless water intake
Authors: Isabaev K , Berdiev M , Norkulov B , Tajieva D , Akhmadi M
Published: July 2020

The paper analyzes the dynamics of channel processes in the Amudarya River section in the area of water intake in the Karshi Main Channel (Karshi region). The results of field studies of the state of the Riverbed environment of the Amudarya River in the area of damless water intake were studied. The course of channel processes in the River bed is studied. A recommendation has been developed to improve the water intake condition. According to the results of a field examination and research of the head section of the supply channel. The state of the River channel Amudarya in the water intake zone was assessed. The results of surveys of the hydraulic and alluvial regimes of sediments of the Amudarya River in the area ofdamless water intake are analyzed and summarized. The results of field studies of the Riverbed environment of the Amudarya River in the region of the Karshi head water intake were studied.
Field target dimensions of flow constrained by a transverse dam
Authors: Bakiev M , Yakubov K , Choriev J
Published: July 2020

Construction and operation of channel control structures in valley rivers require carrying out a comparative study of their operation during design operational periods. The goal of this work is to set target dimensions for flow deformed by the transverse blind dam in field conditions, on the dam № 30 in Amudarya river: the length of upstream and downstream vortex zones, boundaries between the core and intensive turbulent mixing zones, vortex zone boundaries, and their comparison with experimental data. Locations of the sections are set based on the possibility to accomplish the goal, in the headrace, where flow natural condition is maintained, in contraction zone, and within the borders of downstream vortex zone. Sections were fixed with landmarks and leveling instrument Vegal 24 was installed there. Zone boundaries and vortex lengths were set with the use of floats directly from the riverside of the use of boats. Design relationships obtained from the results of laboratory experiments were used to determine the length of upstream vortex zone, contraction area, downstream vortex zone, boundaries of hydraulically homogeneous zones, which were then compared with the field data. It was also set, that coefficients characterized flow spreading beyond the contracted section were equal to C

2
=0.186 and C

3
=0.545 as compared to 0.11 and 0.16 in the theory of turbulent jets. The length of vortex zones is shorter by 11.9% to 26.8%, which shows how much the distance between dams must be decreased in the system.
On the establishment of the correlation dependence of results of physical properties, dynamic probing and filtration coefficient from the granulometric composition of alluvial sands in the valley of the Amudarya river
Authors: Yusupov G , Ruziev I , Nurjanov S
Published: July 2020

Based on the study of the mechanical composition and physical properties of alluvial sands, the correlation equation necessary for engineering and geological studies to analyze the lithological conditions of the soils, the average physical properties of the Amudarya river and soils, and the average number of strokes per 1 dm immersion probe are studied. Quantities of definitions are represented in large numbers. The study of the physical properties of the sand of both terraces is complicated by the very close occurrence of the groundwater level. Above and near the groundwater level, physical properties were studied in pits, some of which were drilled. Samples of undisturbed sand were taken with a 700 cm3 cutting cylinder. The volumetric weight of the skeleton of both terraces in natural addition is the same for species with the same particle size distribution (1.30-1.50 g / cm3). The geological structure was studied in wells that were drilled by a rope method. Samples were taken from these wells to determine the particle size distribution of the sand. The mineral composition of sand and clay determines the nature of their resistance to shear, and clay soils are characterized by resistance to uniaxial compression and rupture.
Non-stationary filtration through a homogeneous rectangular closing dike
Authors: Zaborova D , Musorina T , Petritchenko M
Published: July 2020

A hydraulic structure is an object for the use of water resources, as well as for combating the harmful effects of water. Knowledge of the main parameters of the filtration flow is necessary for solving problems related to the design and operation of hydraulic structures. The article considers filtration calculations of a homogeneous closing dike, which is: determination of instantaneous filtration flow rate and seepage area. It is proved that when the length of the closing dike increases, the height of the seepage area monotonically decreases; the depression curve is constructed; critical time value after which the flow rate takes a constant value equal to the Dupuis flow rate is found.
Experimental studies of horizontal flow effects in the presence of cavitation on erosion – free dampers
Authors: Obidov B , Choriev R , Vokhidov O , Rajabov M
Published: July 2020

Based on cavitation studies, the obtained graphical dependencies for determining the horizontal hydrodynamic effect of the cavitating flow on erosion-free dampers at various stages of cavitation. These data supplement the results obtained earlier. Based on studies, the effect of cavitation on the work of erosion-free dampers was revealed. So, on average, horizontal ripple loads in the zone of the developed stage of cavitation increase by 1.7…2 times. Such a significant increase in loads necessitates taking into account the influence of cavitation when designing the downstream fastening plates with erosion-free dampers. The values of the horizontal hydrodynamic loads on the erosion-free dampers given in the work make it possible to establish the shear loads on the slabs of the water cube under cavitation. The results of this work can be used in design practice to assess the stability of slabs of waterfall fasteners with cavitating erosion-free dampers.
Bilateral contraction of flow by blind dams on easily erodible soils
Authors: Ibrayimov A , Kadirov O
Published: July 2020

In various parts of the Amudarya river, transverse dams are built for channel control and to protect riverbank from scouring. Studies were carried out in CAIRI laboratory to study the hydraulics of flow near structures (dams) on both sides of the channel, specifically spreading patterns of flow overtopping and its erosive capacity. Experiments carried out on 20m x 2m erodible model for discharge values Q = 10.0, 20.0, 30.0 l/sec, contraction degree of n = B/(B-b

0

) = 0.33, 0.5, 0.67 and with the installation angle with respect to the streambank α = 60°, 90°, 120° gave specific results. Based on theoretical and experimental studies, relationships were obtained, which allow establishing the boundaries for flow division, velocity distribution along the width and length of flow, vortex length, distances between structures, as well as the values for backflow velocities along the streambanks, that can be used to construct velocity field in the dam impact zone. The obtained methods allow to get the full picture of a flow spreading beyond dams at the presence of backflow.
Shape parameters of the transverse cross-section of river beds
Authors: Maalem N , Kadirov O
Published: July 2020

The construction of hydrotechnical structures on rivers will require the establishment of the planned dimensions of sustainable supply and discharge rivers. The main goal of this work is to determine the parameters of a stable cross-sectional shape of the river channels of Algeria. The problem was solved using hydromorphological and probabilistic-static methods for determining the parameters of stable channels. Hydromorphological dependencies were established for tens of Algerian rivers between the relative width and water discharge and mainly feedback. Using the probabilistic-static method, the static parameters of the alignment curves were calculated (Sidi Bel Atar of the Shelef Riverβ0= 58.7, CV = 0.184, ξ = 5, CS = 0.92,and also forβ0= 30.44, CV = 0.295, ξ = 4, CS = 1.18.A comparison is made of the theoretical binomial security curve with the actually measured data and which are well approximated. An example of calculation by the proposed method for a specific alignment of the Algerian Shelef river is performed.
Geometric modeling of underground water deposits
Authors: Qosimov J
Published: July 2020

The article considers one of the important problems of modern applied geometry - the development of geometric modeling methods, typification and schematization of topographic, hydrogeological, and geological surfaces, on the basis of which many theoretical and applied problems of engineering geometry are solved. The results of observations of groundwater status indicators are analyzed, which are carried out by measuring the level, pressure, flow, and selection of water from observation wells, springs located in natural and disturbed conditions. The permissible convergence of resource estimates by the amplitudes of fluctuations in the level of groundwater and by the geometric modeling of groundwater deposits has been established.
Characteristics of Relative Growth for HPP Power Systems of Tajikistan
Authors: Kirgizov A , Sultonov Sh , Johnonov M , Usmonov Kh , Tolibzoda I
Published: July 2020

The article discusses the main criteria for optimizing the operational modes of a hydropower power plant in terms of active power. Relative growth characteristics are used to calculate the distribution of active power between stations for more rational use of water resources.

Also, this method allows to optimally distributing the load between the units of one station. Basically, the characteristic of the relative increase in the load of the units depends on the operational characteristics of the hydraulic turbines. The article provides calculations of the relative increase in load at the Nurek hydropower power plant.
Modeling and analysis of a reactive low-pressure hydraulic turbine
Authors: Kodirov D , Tursunov O
Published: July 2020

This work is devoted to the development of a low-pressure reactive micro-hydroelectric power plant that operates independently from the general power supply. Impellers of a reactive hydro turbine proposed for a micro-hydroelectric power station includes a curved confusor nozzle. In this design, the cavitation effect practically does not affect the impeller system. In the turbine, the above-mentioned drawbacks of the existing turbines are minimized. The results of theoretical calculations and tables, graphical dependencies of an experimental reactive micro-hydroelectric power station are presented.
Assessment of land degradation changes in mountain areas in Tashkent province
Authors: Pulatov B , Umarova Sh , Alikhanov B
Published: July 2020

Analyzing the trend of land degradation changes and its cause and consequence in the mountain ecosystem is a matter of concern for sustainable development. It’s important to know that only 10% of the world’s population in rural areas depends directly on natural resources for their livelihood and 40% depends indirectly, i.e. water, biodiversity, and ecosystem. This study focuses on the assessment of land degradation changes in mountain areas of Tashkent province using GIS techniques. The study area is located lowland in the western part of the Tian Shan mountains. The results show that overgrazing significantly affects the mountain ecosystem, which decreased up to 29 thousand ha of pasture land over ten years between 1989-1998. However, changes during 2008-2018 show a significant rise in the pasture area, ending with 45 thousand ha of land. In conclusion, during last decades in Uzbekistan rehabilitation achievements be due to (i) complex measures taken by government and ecologists, who clearly recognized that if the previous scenario will continue, the ecosystem of high altitude areas could be irreversibly damaged; (ii) cutting trees from a forest which leads to decrease forest area and increase pasture area.
Exchange of salt and moisture in the underground water management
Authors: Khojiyev A , Muradov R , Khaydarov T , Pulatov J
Published: July 2020

Water – as moisture, has an essential role in all biochemical processes of plants, all vital processes, occurring in a vegetative organism, can proceed normally only under the condition of sufficient saturation of cages by moisture. Results of theoretical researches on dynamics of ground humidity have shown: (1) similarity of physical processes of change of humidity of soil on different irrigated areas. (2) hysteresis of the nature of humidity at irrigation and drainage. (3) the sharp recession of humidity of soil in the root zone. The developed models (33) - (34) can be used in the calculation of moisture and salt transfer both in the initial period of plant development and in the calculation of washing of saline lands. The use of models and the coefficients of the mathematical model to determine the parameters of moisture and salt transfer make it possible to calculate the reserve of soil moisture and optimize the sowing time at its maximum value.
Optimal solution leaching rates with a deficit of irrigation water
Authors: Khojiyev A , Khaydarov T , Rajabov N , Pulatov J
Published: July 2020

The growing demand for water resources is associated with many natural and anthropogenic factors: diversification of the economy, growth of water supply and requirements, construction of hydropower complexes, problems with managing the transboundary rivers waters, restoration of the ecology of the Aral Sea region and others. Now, much attention is paid to the distribution of irrigation water during the growing season including the introduction of drip and spring irrigation systems, irrigation pipelines, etc. But, unfortunately, attention remains to the issues of effective salt leaching management the land to the extent of soil salinity, crop variety, the composition of salts, and salinity. In this paper, the authors attempt to solve this problem.
Protection of recovery projects and developed areas from flooding
Authors: Sherov A , Soliev B
Published: July 2020

The article discusses the formulation and solution of scientific, theoretical, and practical problems in the field of land reclamation of irrigated lands in general and, in particular, the protection of land reclamation facilities and the territory of cities and settlements from the effects of groundwater. In the Aral Sea basin, due to the intensive commissioning of new irrigated areas and various types of hydraulic structures (reservoir, village storage, canals, etc.), on a large scale, there is a violation of the natural laws of the regime and balance of groundwater. As a result of the hydrotechnical impact on water resources, the usual “losses” affecting the water balance and runoff, in the initial stage of their formation, cause processes such as flooding and flooding of adjacent territories, excessive wetting of non-irrigated lands and worsen the operation of reclamation projects. The open collector-drainage network existing around the land reclamation projects and cities does not provide a normal outflow of groundwater; its maintenance into a working and sanitary state requires large capital expenditures. High groundwater level with high salinity leads to the destruction of the basement of buildings and structures, the complete flooding of groundwater communications, the death of green spaces. According to some available data, losses incurred from exposure to aggressive groundwater in a number of cities in Uzbekistan range from 2.5 to 10 million dollars. The objects of reclamation control are established depending on the main factor determining the reclamation state of irrigated lands, on the degree of their natural drained. Essential criteria for determining the relationship of groundwater with soil – soils and their influence on the reclamation state of irrigated lands are the depth of groundwater table and the degree of mineralization, as well as their seasonal and long-term regime. The presented dissertation is devoted to the study of this insufficiently solved problem. Scientific and technical solutions to this problem are considered on the example of the built-up areas of irrigated areas of the Republic of Uzbekistan, where there are problems of engineering protection from the negative effects of groundwater.
Aeromechanical purification of freshly harvested seed heaps of desert fodder plants
Authors: Farmonov E , Lakaev Sh , Khalilov R , Gorlova I
Published: July 2020

It is stated in the paper that the difficulty in cleaning freshly harvested seed heaps of desert fodder plants and in the creation of cultivation equipment for their sowing is due to specific features of the physical-mechanical properties of seed heaps of desert fodder plants. The high content of weeds (up to 70%) in the composition of freshly harvested seed heaps collected manually or by mechanized methods makes them loose, leading to the impossibility to sow these seeds without preliminary cleaning. A proposed technological process of aeromechanical cleaning of freshly harvested seed heaps of desert fodder plants is as follows. First of all, it is necessary to provide for the enrichment of the heaps by separating the coarse-sized fractions. The enriched heaps of seeds are subjected to stage-by-stage separation. At the first stage, coarse impurities are singled out by a mechanical working body, and at the second stage - separation of seeds and small impurities is conducted by an airflow. A technological process of aeromechanical separation of freshly harvested seed heaps of desert fodder plants was investigated, as a result, the final velocities of particle motion along the working surfaces which have the form of a straight line, a parabola, and a semicircle were determined. The most acceptable form of the working body was identified — a circular semi-ring installed in an aeromechanical separator. The effectiveness of seed cleaning by an aeromechanical separator was determined.
Justification, development of new technology and design for drying seeds of desert fodder plants
Authors: Karimov K , Akhmedov A , Kushimov B , Yuldoshev B
Published: July 2020

Proposals for the development of highly efficient new resource and energy-saving technologies and designs for seed drying are substantiated in the paper-based on theoretical research and scientific results. The developed new improved design of a vacuum drying unit with a heat transfer fluid and a heat accumulator for drying seeds of desert fodder plants, a diagram of the energy storage process, an irradiation scheme using heat waves of a flat layer are substantiated and presented.

The positive effect of external physical fields on drying processes is substantiated and determined by mathematical simulation and experimental methods. Design basics of drying equipment of desert fodder plant seeds are developed in analytical solutions based on numerical values of key parameters. Extensive information is provided on the previously obtained results of an analytical study and computer implementation of the developed advanced mathematical models; the solution to the problem of seed drying in an analytical form for non-stationary and stationary problems of the known system of A.V. Lykov differential equations are given.
Modeling fetus melon as an object of technical processing
Authors: Shaymardanov B , Borotov A , Jumatov Y
Published: July 2020

The Republic of Uzbekistan is one of the leading regions for the production of gourds - especially the most valuable varieties of melons. The nutritional value is primarily due to the high sugar content, and the taste value is due to the sucrose content. Summer grades with a sugar content of 12 … 19% are considered the most sugary. The sucrose content is 60 … 80%, but these varieties for long-distance transportation are practically unsuitable, so they are used in growing areas. It has been established that in non-waste processing from 1 ton of melon fruit it is possible to obtain: melon jam - 155…165 kg or concentrated melon juice (“honey”) – 65 … 70 kg or dried (dried) melon – 70…75 kg; vegetable oil from seeds – 2.5…3 kg; protein flour from the peel – 20…23 kg. The article presents the results of a study of the physicomechanical properties of melon fruits as an object of technical processing of peel, pulp, and seeds. To conduct studies of the physicomechanical properties of melon fruits, a methodology for experimental research has been developed.
Study of the influence of ionized fruit air
Authors: Rakhmatov A , Rakhmatov J , Nazarov O
Published: July 2020

The article presents the results of studying the process of storage of grapes in a fruit storage, identifies the main factors affecting the quality of storage of the product. The mechanism of the effect of ionized air on the stored product is considered and fruit storage modes are determined. The results of studies show the possibilities of determining the operating modes of ionization of fruit storage air.
Economic and statistical methods of frequency maintenance of biogas plants
Authors: Imomov Sh , Shodiev E , Tagaev V , Qayumov T
Published: July 2020

The article gives the importance of the technical operation of biogas plants and methods for their determination in the development of alternative energy sources from organic waste. When comparing the two methods in experiments: determining the frequency of maintenance by the acceptable level of reliability and the acceptable value and regularity of changes in the parameter of the technical condition of biogas plants. Their advantage is shown: in simplicity and the possibility of taking into account risk and taking into account the actual technical conditions of biogas plants (diagnostics), in the ability to guarantee a given level of reliability in taking into account variations in the technical condition. Also, the disadvantages of these methods are given, such as the impossibility of making full use of the resource of individual parts of a biogas plant, due to the fact that the frequency of maintenance (П0) is significantly less than the acceptable level of failure-free operation (ñ), in the absence of direct economic assessments of the consequences of biogas plant failures and the lack of direct consideration of economic factors and consequences. The need to receive (or have) information on the patterns of changes in the parameters of the technical condition. In connection with these, the article presents the results obtained by the method of economics and statistics, while it is shown that the technical and economic method is applicable to complex and expensive systems of units and assemblies that do not directly affect the safety of the biogas complex.
Mechanism for changing the rear axle clearance of a universal-tiller tractor
Authors: Akhmetov A , Botirov R , Abdurokhmonov Sh
Published: July 2020

The article is described the design of the mechanism for changing the clearance of the rear axle of a universal-tiller tractor from a low-clearance to a high-clearance position and vice versa. The most loaded place in the design of the mechanism for changing the clearance of the rear axle, which is the clip, is determined. The dynamic analysis of the load on the cage for three cases of loading in two sections passing through the bearing supports is carried out. At the same time, the main recommendations are aimed at ensuring a sufficient margin of safety in dangerous sections of the cage. In particular, one of the ways to ensure a sufficient margin of safety in dangerous sections of the cage is to use a material for its production - 45L steel. In Central Asia, all mechanized work on inter-row processing of cotton crops is carried out by a three-wheeled tractor adapted to the natural and production conditions of the region. Studies have established a negative technogenic impact of the front wheel of a three-wheeled tractor on the soil, which is eliminated by the use of a four-wheeled tractor. However, its use is constrained by the inadequacy of the agrotechnical passage. To solve this problem, LLC “DTCAM” is developing a four-wheeled tractor equipped with mechanisms for changing clearance, which provides sufficient agricultural cultivation for inter-row processing of cotton crops. Identification of dangerous places in the design of the mechanism for changing the clearance of the rear axle and dynamic analysis of the loads at this place, preventing breakdowns, increases the reliability of this tractor. It has been revealed that one of such dangerous places is a cage connected to the DCT cover, which accepts the main load transmitted from the tractor to the wheels and back. Dynamic analysis of the cage loads for various cases of loading in two sections passing through the bearing supports showed that the most loaded section is the section of the bearing support located on the DCT side. There is an insufficient margin of safety in this section when the tractor moves along irregularities. To ensure reliable operation, it is recommended to introduce the hardening of the cage area from the DCT side, where the bearing of the mechanism for changing the clearance of the rear axle is at least 35 HRCe, or use material - steel 45L.
Electrical technology of moisture content reduction of industrial-grade cotton seeds
Authors: Ibragimov M , Eshpulatov N , Matchanov O
Published: July 2020

The electric-contact heating method is proposed to be applied to reduce the moisture content of the industrial-grade cotton seeds to meet the relevant standard requirements. The rationale for safe heating conditions has been provided. The effect of different factors on the efficiency of the preliminary drying of seeds has been studied. Theoretical and graphic laws of the specific energy consumption change depending on different parameters have been defined. The obtained results prove the high efficiency of the proposed method: specific energy consumption decrease by 2.8 – 3.8 times against the existing technology.
Reliability indicators of stabilizing devices in the agriculture electrical supply system
Authors: Karimov R , Rasulov A , Shamsiyev K , Bekishev A , Kurbanova N , Musashayxova N
Published: July 2020

The article discusses the issues of reliability indicators of a voltage stabilizer built based on non-contact switching of a boost transformer and an autotransformer used for domestic consumers. The probability of uptime, which depends on the real mode of functional units and elements, is considered. The stabilizer equivalent circuit is given for calculating the reliability indicators taking into account the power unit and control. The failure rate of elements is specified taking into account correction factors. The schedule of uptime depending on the power and the failure rate and the probability of failure of the elements of the voltage regulator.