bluuebunny/crossref_metadata_2025 huggingface dataset:
Development of Testing Equipment of Hydrokinetic Turbine Model to Support Implementation of the Laboratory Work
Authors: Boike Sinaga Jorfri , Tanti Novri , Dyan Susiala M.
Published: July 2020

Mechanical Engineering Department, University of Lampung has been established since 1998 and in the implementation of learning process at this departmen supported by ten laboratories, that is: Laboratory of CNC, Laboratory of Drafting, Laboratory of Materials, Laboratory of Manufactured, Laboratory of Computer, Laboratory of Industry Metrology, Laboratory of Structural Mechanics, Laboratory of Thermodynamics, Laboratory of Fluid Mechanics, and Laboratory of Combustion Engine. These laboratories are used as research means for the lecturers and the students and also for the implementation of the subject of available laboratory work in the curriculum of Mechanical Engineering Department, University of Lampung, One of the subjects of laboratory work is machine performance, where this laboratory work is carried out in three laboratories, that is Laboratory of Thermodynamics, Laboratory of Fluid mechanics, and Laboratory of Combustion Engine. The testing equipments are available until now, namely, vapour compression refrigeration system, Pelton turbine, and combustion engine, and these testing equipments need for the addition to support this laboratory work. However the funding from university is very limited. Therefore addition testing equipment must be made. In this paper design of a testing equipment of ultra low head hydraulic turbine model is presented to be used for laboratory work of machine performance in Mechanical Engineering Department, University of Lampung.
An experimental study on the response of composite plate due to granade explosion
Authors: Gunaryo  , Kuswoyo Andi , Widagdo Djarot , Hadi Bambang K , Heriana  , Tappang Manuel S
Published: July 2020

Composite material is gaining acceptance for protective structures against explosion, such as granade explosion. This is due to its ligh tness and high strength. In this paper, the response of composite plate subjected to granade explosion was studied experimentally. The composite plate was made of glass and carbon fiber with different number of plies and lay-up. The plate dimension wa 250x250 mm. The granade contains 40 grams of TNT and the shell was made of cast iron. The total mass of the granade was 365 grams. The stand-of-distance was veried, which was 300, 500 and 1000 mm. The results showed that all specimens were able to keep their integrity without collapse. The carbon fiber composites showed some small fragmet penetration, while the glass fiber composites showed no fragment penetration although some delaminations occured. The almunium plate showed fragment penetration and large plastic deformation. Therefore in this case, composite plates performed better than the aluminium plates.
Characterization of Predictive Control Based on Model (MPC) in Multivariable Process of Milling in a Mineral Concentrator Plant
Authors: Tisza Juan , Chauca Mario
Published: July 2020

In this article, the simulation level characterization of the predictive control system -based in multivariable model (MPC) is developed, without restrictions in a milling process of a mineral concentrator plant. The multivariability of the process is considered and is evaluated the interaction between the variables. The control strategy that integrates all the control actions is developed, assessing the robustness in the application against disturbances. Generalized predictive control (GPC) is used, presenting the methodology in accordance with the philosophy of predictive control MPC, based on an initial modeling of the process, developed in reference [1]. The case study includes the use of a ball mill in a process of 4 input variables by 4 output (MIMO 4x4), where one of the output variables of greater control is the size of the mineral particles in an iron mine. The results of the control are evaluated observing and discussing the temporal responses in all the variables, the robustness of the control system is evaluated considering the response of the system before the application of multiple disturbances. Results are presented in various simulation scenarios using MATLAB.
Tool Wear Analysis of Coated Carbide Tools on Cutting Force in Machining Process of AISI 4140 Steel
Authors: Lubis Sobron , Rosehan  , Darmawan Steven , Indra Benny
Published: July 2020

In manufacturing industries specifically in metal machining, the use of the cutting tool is important to consider. The use of the cutting tool has not been used optimally, as well as cutting parameters. In the cutting process, the wear of the cutting tool and cutting force has a very close relationship. This research was carried out to analyze the wear of coated carbide cutting tool and cutting forces produced in turning AISI 4140 steel workpieces. This study was conducted with a variation of five cutting speed levels consisting of 180 m/min, 220 m/min, 260 m/min, 300 m/min, 340 m/min and depth of cut 0.7 mm. To observe the tool wear, every 5 minutes with a maximum limit value of VB of 0.3 mm and for the cutting force values taken every 1 minute. From the results of the study obtained: The increase in the value of the cutting force is affected by the increase in wear that occurs in the cutting tool due to a change in tool geometry due to wear on the cutting tool. The highest feeding force value is at the cutting speed (Vc) 340 m / min at 368 N and the greatest cutting force value is at the cutting speed (Vc) 340 m / min at 371 N.
The Use of Quality Metric To Control Quality Of Telecommunication Project (Case Study: Regional Metro Junction)
Authors: Muhammad Zaki Naufal , Haryono Imam , Pratami Devi
Published: July 2020

Regional Metro Junction is known as a telecommunication network project which connects one city to another city / village. This project has specific quality requirement to be achieved. However, the project executor didn’t meet the quality requirement from project owner because there’s no quality guideline in the planning process of the project, so it caused several quality problem in the execution process such as 2.700 meters twisted cable, 76 poles wrong location and 35 poles tilted. In addition to that, this paper aimed to design quality metric using internal control method as a guideline to control quality the project in order to minimize the potential of rework. The step of making this quality metric is identifying the possible issue of each activity, creating the critical success criteria of each activity based on requirement documentation then identifying the resources needed of each activity. The result shows that the number of defect is decreasing as much 750 meters for the twisted cable, 44 wrong pole location and 27 tilted pole. At the end, this quality metric guideline is useful to minimize the defect of the project and can be lesson learned for another project.
Comparison Study about Inventory Control System from Some Papers in Indonesian Case Study
Authors: Hoswari Shelinsca , Gozali Lina , Anne Marie Iveline , Wayan Sukania I
Published: July 2020

Inventory is one of the most important parts in production management, because by controlling the inventory of raw materials it’s trully optimizing the quantity order of raw material for producton process. This case must be considered so that there is no slow moving in inventory. Because this is one component of production cost, which has been complaining that the cost in this sector are quite high. The right method according to the problem can be used to find out the optimum amount in ordering so it can improve the efectiveness of total company inventory cost that will spent. The aim of this paper will determine the gap among some research and studies about Inventory Control, Optimizing the Quantity Order and the Total of Inventory Cost. This paper will be described by comparison study of several inventory control method, so in the future research could give new contribution.
Comparison Study about Warehouse Layout from Some Paper Case Studies
Authors: Sudiarta Natalia , Gozali Lina , Anne Marie Iveline , Wayan Sukania I
Published: July 2020

The warehouse activity has an important role in increasing production. A warehouse may be defined as a place used for the storage or accumulation of goods. The placement of raw materials in warehouse can be a serious problem. To solve the problem, warehouse layout planning is needed. The objective of this paper is to find out the gap between the methods that used in warehouse layout planning. The methods that can be used are Dedicated Storage, Class-Based Storage, Shared Storage, Randomized Storage and also Fishbone Layout. Each methods are used to reduce material handling distance so the flow of raw material will reach an optimum solution.
The strategy improvement of the engine maintenance
Authors: Sembiring Nurhayati , Varian Koto Deli Diva
Published: July 2020

PT. A is a company engaged in the manufacture of Crude Palm Oil (CPO) and Palm Kernel Oil (PKO). Constraints faced by PT. A is no planned scheduling of machine maintenance. Therefore, it is necessary to design a maintenance strategy in the form of a machine maintenance schedule to overcome the problem, as well as an analysis of the causes of failure of engine components that are often damaged. This problem is solved by using the Reliability Centered Maintenance (RCM) methods in determining repair priorities so that a more optimal treatment plan is obtained. The Pareto diagram is used to determine the most critical machine in the RCM method. The results of the pareto diagram obtained by the screw press machine are the most critical machines. Furthermore, the results of the application of RCM methods obtained components that must be treated regularly (time directed).
Analysis the measurement quality system of clearence tappet using measurement system analysis on motorcycle manufacturing company
Authors: Olyvia Doaly Carla , Sriwana Iphov K. , Salomon Lithrone , Farrell
Published: July 2020

A motorcycle manufacturing company on the K56S engine has a symptom that often occurs called noise tappet. The observations found that Symptom was caused by clearence or tappet gap that was not in accordance with the specified specifications. The gap measurement system uses filller which usually relies on the experience and feeling of the operator, so it is possible to produce an unsuitable gap measurement. This research will evaluate the measurement system of clearence tappet using Measurement system analysis (MSA) which includes stability, bias, linearity, repeatability & reproducibility. Based on data processing known that the measurement system has a stable process with a linearity level of 2.6% is acceptable. The measurement system has a biased problem with an average bias value of 0.054 mm (not acceptable) and from repeatability & reproducibility with a GRR% of ANOVA method of 49.98% that exceeds the acceptance criteria.
Vehicle Road Accident Prediction Model along Federal Road FT050 Kluang-A/Hitam-B/Pahat Route Using Excess Zero Data
Authors: Prasetijo J. , Musa W. Z. , Mohd Jawi Z. , Zainal Z. F. , Hamid N. B. , Subramaniyan A. , Siang A.J.L.M. , Anting N. , Mohd Hafzi Md I.
Published: July 2020

Traffic accidents have become a major socio-economic problem in Malaysia as it is the primary cause of mortality. Over 60 percent of these fatal accidents occurred on rural roads. Nearly half of all fatalities took place on federal roads and over a quarter happened on state roads. It is also estimated that about 2 percent of the country’s Gross Domestic Product (GDP), or approximately RM 9 billion, is lost through road accidents. Previous studies managed to develop several models for modelling the occurrence of accidents, but most of these models have plenty of deficiencies. The following study focuses on stochastic regression models, such as Poisson, Negative Binomial, Zero-Inflated Poisson and Zero-Inflated Negative Binomial with excess zero outcomes on the response variables. Furthermore, in order to specify the regression relationship with a sophisticated result, R-statistical programming is used. The method used is also the updating approach in predicting potential road accidents, which can also produce an accuracy probability of hazardous locations. Based on road accident data collected over a five-year period from 2010 to 2014 at Federal Road F0050: Kluang-A/Hitam- B/Pahat in Johor, Malaysia, results of this study show that Zero Inflated model performed better, in terms of the comparative criteria based on the AIC value.
Medical Diagnosis System in Healthcare Industry: A Fuzzy Approach
Authors: Sevani N , Setiawan A , Saputra F , Sali R. K. , Sunardi O
Published: July 2020

Salmonella bacterial infection often cause uncertainty during medical diagnostic phase. Two most common diseases caused by salmonella bacteria are typhus and diarrhea. This study aims to apply fuzzy inference system within medical diagnostic system so that the uncertainty of diagnostic process can be minimized. At first, a knowledge-based system was developed based on physician experience, containing 13 symptoms and 11 rules. Secondly, a web-based platform was designed as a media for physician and or patient to perform diagnostic process. Thirdly, an evaluation of the proposed system was conducted by using black box testing, white box testing, and error measurement via confussion matrix. This study found that by applying triangular membership function, Mamdani inference engine, and defuzzification centroid, the system was able to differenciate between typhus and diarrhea. Furthermore, the web-based medical diagnostic system showed an error rate of 0.3. In other words, the proposed fuzzy-based system was in line with the diagnostic result proposed by the physician.
Expanded Coverage Remote Control
Authors: Satria Utama Hadian , Honorris Tryas , Surjati Indra
Published: July 2020

Remote control mostly uses infrared radiation for transmitting data to be received by the controlled electronic home appliances. Since infrared radiation transmission is line of sight by nature, it is not effective when the control is needed for larger coverage areas where there are obstructions between transmitter and receiver. This limitation inspired the design of the expanded coverage remote controller. In this design, Android application is used for user interface. The application uses internet for data transmission media, so that controlling from different rooms or very long distances can be achieved. The controller was designed for five infrared control signals. The electronic home appliances that can be controlled are air conditioners and television sets, using preset buttons on the application.
Detection of Cholesterol Levels by Analyzing Iris Patterns using Backpropagation Neural Network
Authors: Rachman L B , Basari
Published: July 2020

Detecting cholesterol levels with iridology can be an alternative method for checking human’s health. Iridology analyzes diseases and weaknesses of the body based on the shape and structure of the iris. This study uses image processing to analyze patterns in the outer portion of the iris bordering the sclera. Colored iris images are converted to grayscale to facilitate image processing. The results of color conversion still contain noise so that the Median Filter is used to eliminate noise in the image. The iris image which is still in the form of polar is transformed into a rectangular shape. This is used to facilitate the taking of the area to be analyzed. Next, the iris image is filtered using a Gaussian Filter to get smooth results. This is used to remove lines on the iris image after being converted into a rectangular shape. From the filtered image, the statistical value is calculated using the Gray Level Co-Occurance Matrix (GLCM). This is a comparison method which will produce several statistical characteristics, namely Energy, Correlation, Contrast, and Homogeneity. The four statistical characteristics will be used as input data for training using the Backpropagation Neural Network method that will produce output in the form of normal cholesterol or high cholesterol. The results of experiments on thirty images obtained an accuracy of 96.67%.
Twitter Users Opinion Classification of Smart Farming in Indonesia
Authors: Nata Salim James , Trisnawarman Dedi , Choirul Imam Muhammad
Published: July 2020

In the past year, Indonesia has digitalized agriculture called “Smart Farming” or “Agriculture 4.0” to follow the era of the industrial revolution 4.0. Public opinion on social media is a strong factor in determining whether or not smart farming is implemented in Indonesia. So the purpose of this research is to find data from Twitter and then analyzed using the sentiment analysis method, which will be classified using Naïve Bayes method. This process starts with searching data on Twitter, preprocessing text, classification, and finally testing. The accuracy testing results gives a value of 0.97, and Recall produces a value of 1.0, F1 produces a value of 0.98 and an AUC value of 0.5.
Grouping of Tourism Objects Using Geotagged Photo with Hierarchical Clustering Method in Bantul and Sleman
Authors: Lusiana Fenny , Tji Beng Jap , Wasino
Published: July 2020

Bantul and Sleman regency has many tourism object that can attract tourists. However, tourism objects in this area are still poorly known by many people. When tourists visit tourism objects, they like to take pictures with a smartphone. The geotagging process can be done when taking photos using a smartphone. This data consists of latitude and longitude coordinates, though they can also include altitude, distance, and place names. The purpose of this study is to visualize photos of tourism objects based on location and provide detailed information related to the geotagged photo. The method used in this study is agglomerative hierarchical clustering. Grouping photos based on a hierarchy that starts from the village, district and regency. The results of this study are an application that can help users to receive information about tourism objects and display the location of photos with google maps. Users only need to upload a geotagged photo, to get this information. This application testing will be carried out by visitors of tourism objects in the Bantul and Sleman regency.
Comments Scraping Application For Review Youtube Content
Authors: Viny Christanti M. , Walda  , Sutrisno Tri
Published: July 2020

YouTube is one of social media that allows people to upload, view, and share videos through website. YouTube’s mission statement is to give everyone a voice and show them the world. Through YouTube, people can express their voices or show their creativity effortlessly. YouTube provides service for users to give opinions through comment section. The comments of users can be used to decide either the video has good ratings or not. Web Scraping can be used to take the comments of users from comment section. Web Scraping is a method to take some information from website by extracting data through tags in html. By inspecting code the YouTube website, the information of comments is contained in ‘ytd-comment-thread-renderer’. Information of comments is divided into reviewer and content of comments. Reviewer’s information is contained in id ‘author-text’ and the content is in ‘content-text’.
Vane pumps with cavitation-abrasive wear of their parts
Authors: Mamajanov M , Rakhimov Sh , Urazmukhamedova Z , Shamayramov M , Nishanbaev Kh , Dehkanova N
Published: July 2020

The article presents the results of the tests on cavitation-abrasive wear of pumps, depending on their operation modes. And also, in the work, the issues of the appearance of cavitation in hydro abrasive flows, which can lead to rather complex phenomena, which presents difficulties for understanding the essence of the process, are considered. To date, the wear of the working bodies of centrifugal and axial pumps, depending on the mode of their operation, has not been sufficiently studied and a methodology for choosing operating modes that takes into account the wear of their parts has not been developed. Also, the work presents the results of comprehensive laboratory and field studies to research the wear rate of the elements of the flowing part of centrifugal and axial pumps. An alternating pulsating load leads to an increase in the force of interaction of the hydro abrasive flow with the surface of the chamber and increases its wear by 10%, and also reduces the productivity of the pump unit to 9%. It is recommended that the operating modes and the geometric height of the suction of the pumps be selected based on cavitation characteristics constructed from erosion tests.
The influence of the shape the living section of the pressureless machine channel and the roughness of its wetted surface on the hydraulic resistance
Authors: Uralov B , Isabaev K , Jamolov F , Akhmadi M , Mirzaev M
Published: July 2020

Turning to the question of those engineering problems, the solution of which can be used the results of this work, let us first of all select from the wide range of design cases related to pressureless channels, the main design case, which we will keep in mind in the future (as, so to speak, «starting»). Concerning the indicated main design case, we agree to consider the non-pressure movement of water in the prismatic channel (operating in summer conditions) along which uniform turbulent movement of water occurs, which is almost pure in the absence of waves and other phenomena that violate the uniform motion regime, assuming that if such phenomena are taking place, then they should be taken into account the introduction into the calculations of the relevant adjustments. The statement of the above problems in most cases boils down to the following, it is necessary to find a water slope such that its cross-sectional shape is stable (indelible) and the living cross-sectional area is smallest. It is known that such a problem, until recently, was solved by using the concept of “maximum permissible speed” V

max
(related to the uniform movement of water). The magnitude of this speed was assigned (and is currently assigned) based on reference data on the type of soil (and in some cases depending on the depth of the water in the channel). Knowing V

max
and the flow rate, one can easily find the cross-sectional area, as well as the channel slope (using formulas to determine the Shezi coefficient «C» or hydraulic friction coefficient λ and following the accepted value of the roughness coefficient). In engineering practice, when hydraulic calculations of the channels under consideration, we usually use the Shezy coefficient «C». Meanwhile, there is a shared opinion by us that, when performing the above calculations, it is more advisable to use the coefficient of hydraulic friction λ.
Improving the efficiency of lead exploitation pumping station channels
Authors: Rakhmatov N , Nazaraliev D , Artykbekova F , Uljaev F , Sapaeva M , Jumanov O
Published: July 2020

The paper analyzes the dynamics of channel processes in the channel of the supply channels of pumping stations. The results of field studies of the condition of the channel environment in the supply channels of the pumping stations were studied. Based on the results of field inspection and research of the supply channel, recommendations were developed to improve its operation. Analyzed and summarized the results of surveys of the hydraulic and alluvial sediment regimes in the channel of the supply channels. The results of the effects of sediment entry into the chambers of pumping stations are presented.

The dynamics of reducing the capacity of the supply channels of pumping stations were analyzed;

The effect of sediment on the impellers and other stationary parts of pumping units, leading to a decrease in their performance;

Recommended new layout schemes of the route and sedimentation tanks of the supply channels of pumping stations;

A device of additional structural elements is proposed that allows improving the operating conditions of the supply channels of pumping stations.
Parameters of flow in a section compressed by transverse floodplain dams
Authors: Bakiev M , Kaxxarov U , Jakhonov A , Panjiev Sh
Published: July 2020

On floodplain rivers there are characteristic features of the construction of hydrotechnical structures, which in their design should be done taking into account this. These are the different types of floodplain and other floodplain, changes in the period of floodplain inflow, the interaction of flow and floodplain flows, the ability of floodplain rivers to water, the speed of flow and the features of turbidity, etc. The main purpose of this study is to develop a method of determining flow parameters in a two-way compressed cross-section with cross-dumbbells in the floodplain, taking into account the different bias of the Ozen and floodplain as well as the interaction of flows Experimental studies were conducted for parallel case of two-sided poise Ozen and poise flow arrows. The width of the beams is 85 sm, the width of the beams is 30 sm, the length of the lath is 11 m, the slope is i=0.0005, the slope is n=0.016 and the parameter of the dumbbells is n

n
=0.023. The flow parameters are long F

rp
=0.01-0.3, R

ep
>10000, floodplain F

rn
=0.01-0.18: R

ep
>4000. On the surface, the change in the compression coefficient EPR in the cases of dumbbells installation angle α

d
<900 and α

d
≥900 was found to be heterogeneous and analytical expressions and graphs were developed to determine their values. The formulas for determining the speed of flow in a compressed cross-sectional area were proposed, taking into account the subordination of speed scanning to the expression Shlixting-Ayramovich in the zone of interaction by applying the equations of motion and consumption preservation
The influence of sedimentation reservoir on hydraulic parameters of irrigation channels
Authors: Samiyev L , Allayorov D , Atakulov D , Babajanov F
Published: July 2020

The article describes the influence of the exploitation condition of the reservoirs on the hydraulic parameters of the Big Fergana main channel in Fergana valley. Fractional and variable chemical composition of the sediments flowing with the water into the reservoir as well as their changes during the growing season is considered to be the main factor of this process. As a result of field experiments, it was found that the main share of sediments flowing into the reservoir consists of sand particles with a size of 0.01-0.1 millimeters. Analysis of the working effectiveness of the reservoir showed that 45-50% of these particles are kept within the reservoir, while the other pass further to the channel. Surveillance and experimental studies on the reservoir are mainly based on sedimentary particles of 0.10-0.05 and 0.05-0.01 mm and their water content is around 71-85.4%, with a larger size of 0.1 mm. and sediments with a diameter greater than the average for most of the aquifer. The obtained results indicate the influence of the sedimentary water reservoir on the hydraulic parameters and functioning capacity of the Big Fergana channel.
Management of capital assets of construction organizations
Authors: Saidova M , Ahmedov A , Rakhmatullaeva Sh , Osipyan R
Published: July 2020

The most significant part of the assets of the enterprise are fixed assets, which are on the balance sheet of the enterprise and are in operation, in reserve, on preservation, as well as leased to other enterprises.

The study of these issues is necessary for all firms and enterprises facing the problem of maintaining the accounting policy of fixed assets and their depreciation. Choosing the right and optimal accounting policies for fixed assets and depreciation greatly helps the enterprise to minimize taxes and speed up the process of updating the equipment fleet. This article focuses on accelerated depreciation methods. Any enterprise is interested in maintaining such accounting policy, in which during the first years of operations with the fixed assets are written off by a high depreciation rate. The implementation of such a policy reduces taxable profits and accelerates the renewal of fixed assets, which is especially important now, with rapid progress in science and technology.

The results of the analysis of the fixed assets of the construction organization showed the need to improve their accounting. The development of accounting policies of a modern construction organization can largely determine the improvement of management in a market economy.
The hydraulic efficiency of the soil channels
Authors: Fatxulloyev A , Gafarova A , Otakhonov M , Allayorov D
Published: July 2020

The article is devoted to the improvement of hydraulic efficiency and exploitation reliability by improving the hydraulic parameters of soil irrigation channels, and given the results of the authors’ research in theoretical and natural conditions. The article illustrates the analyses of the current problems in the existing soil canals and their negative consequences due to the deformation processes in the channel bed and consequently the increase in flow dynamics and kinematics of hydraulic resistance. Based on the analysis of the results which conducted by Altunin V.S. Zheleznyakov G.V. Karasev I.F. Kosichenko Yu.M. and Mirtshulava Ts.E. in the assessment of hydraulic efficiency and exploitation reliability of the channels, the hydraulic efficiency and operational reliability of the canals have been evaluated. Researchers conducted in Tashkent and Big Fergana canals, which are located in different natural and geographical conditions. The study of deformation processes in soil channel bed provided with the help of XSLEM-Doppler (River Surveyor Live), the formation of flow dynamics and kinematics, and the activation of hydraulic resistance. Based on the study of the kinematic parameters of flow created a velocity diagram expressing the distribution of velocities by the depth of flow in the soil channel in natural conditions. The hydraulic friction coefficients for the Tashkent and Big Fergana canals were determined using the kinematic parameters obtained with the help of River Surveyor Live in natural field conditions, as well as the water permeability of the canals was assessed. Also, the speed diagram, which is one of the most serious problems of hydrodynamics, was built based on data obtained with the help of modern measuring instruments. Also, the study of the formation of kinematic and dynamic parameters in soil-based irrigation canals and the improvement of hydraulic parameters of irrigation canals based on conditions of hydraulic efficiency and operational reliability were concluded. The results of the study are important in the effective use of soil irrigation canals, increasing the reliability of water supply to consumers.
Estimation of sediment volume in Tuyamuyun hydro complex dam on the Amudarya River
Authors: Khodjiev A , Ikramova M , Akhmedkhodjaeva I , Xoshimov S
Published: July 2020

The water reservoirs’ sedimentation significantly impacts on its capacity and water supply efficiency, so estimation of sediment volume is an important action at management. Many methods are used for this purpose, including mathematical models, hydrologic and hydrometric methods, etc. However, each reservoir is a unique strategic object and when selecting a calculation method all specific characteristics should be taken into account. In the present research, a mathematical model and developed soft were used to estimate the water and sediment flows in the Channel reservoir of the Tuyamuyun Hydro Complex, located in the lower sides of the Amudarya River, Uzbekistan. The estimation is based on the evaluation of both suspended and bed-load sediments dynamics taking into account variation of the water level in the reservoir as affecting factor, i.e. its operation mode. The average multi-year sediment rating curve and empirical equations were corrected based on effective factors, such as time and conditions of measurement, which increased the model efficiency.
Water resource saving in irrigation networks through improving the efficiency of reinforced concrete coatings
Authors: Kattakulov F , Muslimov T , Khusainov A , Sharopov Sh , Vokhidov O , Sultanov Sh
Published: July 2020

This article examines the hydraulic conditions of the soils and their defects by analyzing the hydrogeological conditions of the land along their alignments to reduce the excessive water consumption in the irrigation networks and the rational use of the existing canals. The surveys were conducted on the example of the Dustlik channel in the Syrdarya region and the Khamdam channel in the Tashkent region. The technical condition of reinforced concrete coatings in these channels was analyzed and recommendations were given to increase the icing resistance and waterproofing of cement mixtures using the chemical additive Antihydron – 2D to fill the cracks and deformations also for repair, restoration, protection and waterproofing of structures and products from concrete, stone, brick.
Transfer of Amudarya flowing part to increase the supportability of the Uzbekistan southern regions
Authors: Bazarov D , Shaazizov F , Erjigitov S
Published: July 2020

The issues of the availability of irrigation water in the southern regions of Uzbekistan, the existing problems in machine irrigation systems, as well as the disadvantages and advantages of the proposed solutions, are analyzed. In analyzing the current situation, a systematic approach was used to address the issue of the availability of irrigation water in the southern regions of Uzbekistan. When choosing the most optimal options for laying the channel, modern methods of GIS technology were used. A situational analysis showed that water availability in the southern regions of the republic is complicated by the change and violation of the hydrological regime of the river basin by the construction of large reservoirs in its upper reaches. To solve problems with the security of the southern regions of the republic, a new concept is proposed for transferring part of the river flow. The proposed new concept of the transfer option differs from the previous ones by a) There are no additional costs for renting the territory of Turkmenistan; b) Conditions are being created for the development of various infrastructures in the southern regions of the republic; c) The construction of a reservoir on the territory of the Surkhandarya region will allow the danger of overflow of the Tuyamuyun reservoir in the winter and increase water supply to the Surkhandarya, Kashkadarya and Bukhara regions of the republic.
Possibility of landslide damming in the Vakhsh River catchment and its effect on the hydraulic schemes and population
Authors: Fomenko I , Strom A , Zerkal O
Published: July 2020

Large-scale landslides in mountainous regions can create high natural dams resulting in valleys inundation and subsequent disastrous outburst floods that can devastate entire valleys and cause serious problems for the hydraulic schemes located far downstream. Thus, it is very important to identify sites where such damming could occur in the catchment areas of rivers, where artificial dams and reservoirs are constructed. A case study from the Vakhsh River catchment is presented where evidence of an extremely large slope instability have been identified. Its safety factor was determined considering the possibility of an earthquake occurrence in this tectonically active region. The height of the anticipated natural dam and volume of the dammed lake were estimated as well based on the empirical relationships. Measures aimed to mitigate the potential risks are proposed.
Impact of Climate Change on Irrigated Agriculture in steppe Zones of Uzbekistan
Authors: Salokhiddiov A , Khakimova P , Ismailov M , Razzakov R , Mirzaqobulov J
Published: July 2020

The study has been conducted in the newly developed by lift irrigation areas of Karshi steppe (Uzbekistan). The research questions included an assessment of the climate change impact on agricultural production. The studies allowed to examine main factors affecting the behavior of agricultural producers in the face of climate change, as well as their current practices and skills for adapting to the effects of climate change. As research results show, the impact of climate change on irrigated agriculture in the study areas has become especially tangible over the last decade. In this regard, situations arise with crop losses and reduced quality of agricultural products. According to research outcomes the agricultural producers have general information and general knowledge about climate change and its impact on agriculture. The most important consequences caused by the climate change impact on irrigated agricultural production include - increasing in water scarcity, growing in numbers of agricultural pests and plant diseases, declining in crop yields, instability and unpleasant weather surprises, the need to spend more labor and resources to get a satisfactory crop yield, salinization of land and water resources contamination, increase in the frequency and intensity of extreme weather events such as droughts and frosts, and others.
Water-saving irrigation technologies for cotton in the conditions of global climate change and lack of water resources
Authors: Khamidov M , Khamraev K
Published: July 2020

The article presents the results of the experiments on the study of irrigation technologies of cotton in the conditions of grassy-alluvial, saline, and medium loam soil of the Bukhara oasis by lying black film on cotton furrows and using polymer complexes. In field experiments, irrigation technology was carried out by using the irrigation received moisture content of the soil recommended for grassy-alluvial, saline, and medium loam soil of the Bukhara oasis at 70-80-65% compared to LSMC. When the cotton was irrigated 4 times according to the scheme 1-3-0 with irrigation norms of 767, 604, 622, 644 cbm/ha and seasonal irrigation rate of 2637 cbm/ha by covering furrows with the black film and 1818 cbm/ha compared to the control option, the river water was economized and the yield was higher which was 46.8 h/ha. Even when irrigated by using polymer complexes, cotton was irrigated 4 times according to scheme 1-3-0 with irrigation norms of 779, 616, 650, 667 cbm/ha and seasonal irrigation rate of 2712 cbm/ha by using polymer complexes and in this regard, 1743 cbm/ha of the river water as compared to the control option was saved while the yield was 44.8 h/ha. Increased cotton yield by 3.0-5.0 h/ha and saving river water by up to 30-40% was achieved through the irrigation technology by using the screen, which was created by covering the black film and polymer complexes.
Investigating the advantages of sub-surface irrigation method in winter wheat productivity
Authors: Isaev S , Begmatov I , Goziev G , Khasanov S
Published: July 2020

Studies have found that the sub-surface method of winter wheat irrigation halves the number of irrigations and reduces the crop water consumption by 970-1015 m3, inter-row treatment procedures, and the consumption of fuels and lubricants. The productivity of winter wheat grain in comparison with the control (without sub-surface irrigation) is increased by 0.9 t/ha, environmental pollution from agrochemicals is prevented. The sub-surface irrigation method in conditions of meadow soils with a groundwater level of 1-3 m and mineralization of 1-3 g/l experimented in this paper and the influence of this method on the development dynamics of winter wheat (Polovchanka) on obtaining high yields was also tested. The number of irrigations increased to 6-7 times instead of 3-4. Therefore, on such lands, we recommend while designing the drainage system, the designers should plan the depth of the drains no more than 1.5 meters. Sub-surface irrigation is a temporary closure of closed drainage during the growing season of winter wheat, leading to an increase in groundwater level (80-130 cm), thereby leading to an increase in the moisture reserve in the soil.
Ecohydrology of the Syrdarya River under irrigation water management in the Fergana Valley
Authors: Kenjabaev S , Arifjanov A , Frede H , Apakhodjaeva T
Published: July 2020

Sustainable and efficient water resources management is important for the irrigation dominated agricultural system and therefore for the rural population and the environment of the arid regions. The objective of this study is to provide an overview of ecohydrology and irrigation water management in the region and to lay down some opportunities for cooperation at the transboundary level with the aim of increasing water productivity and environmental sustainability. Based on extensive literature review and analysis of secondary data from different organizations, we found that water management in the region’s agriculture faces increasing challenges that are accumulated over time. It is hoped that conclusions from this study will help set the stage for productive discussions and to identify research needs in the region.
Thermodynamic bases of mechanical working of metals by cutting
Authors: Toshmatov E , Akhmedov A , Ibragimova Z
Published: July 2020

Thermo-mechanical phenomena that occur during the metals cutting in a cylindrical form are difficult in terms of systematic and interconnected mathematical description for a three-dimensional deformable body. In this connection, empirical formulas of the cutter interaction with the processed surface of metal products are used in calculations. In this paper, we propose the most general approach for modeling the process of metalworking by thermodynamically nonlinear strain. Using the non-classical theory of deformation, the three-dimensional problem of metalworking by cutting is reduced to a two-dimensional one. The proposed approach made it possible to compose resolving equations and boundary conditions for the problem under consideration, taking into account heat release and wear on contact sur faces with a cutting tool.
Economic load intervals for selecting 10 kV cable cross-sections for agricultural consumers
Authors: Taslimov A , Rakhimov F , Nematov L , Markaev N , Bijanov A , Yunusov R
Published: July 2020

District electric networks for agricultural purposes are characterized by a constant increase in loads. In these conditions, it is important to choose the correct parameters of power lines and, first of all, the cross-sections of overhead lines (overhead lines) and cable lines. There are technical possibilities to increase the capacity of overhead power lines, which can be carried out in the following ways: voltage regulation; reactive power compensation; replacement of existing wires with wires of a larger cross-section; load unbundling; transfer of the network to an increased voltage. Increasing the capacity of cable transmission lines by all of these methods is not possible due to their design features. Thus, due to the difficulties of increasing the capacity of cable lines and dynamically developing networks, the problem of choosing the optimal cable cross-section for lines with an ever-increasing load is becoming more acute. Currently, agricultural distribution electric networks have a constant increase in load. In these conditions, the correct choice of the parameters of cable lines and the residential cable line is of great importance. Due to the complexity of increasing the throughput of cable lines and dynamic networks, problems arise with the choice of optimal paths for wires and residential cables for agricultural lines.
Results theoretical study of the form ofa front surface of a chisel-cultivator stand
Authors: Nasritdinova U , Khahkberdiyev B
Published: July 2020

In this article was revised theoretical research forms of stand on agro-energetical indicators of chisel cultivator’s work. For the exception of clogging up of stands with plant remainders, it is important to change their configuration so that the opportunity to stand self-cleaning from plant remainders during the work itself would appear. To find optimal forms of the cross cut there was studied different existing and experimental forms of stand frontal covers. The conducted researches show that asymmetrical frontal cover of stand better cleans from litter, and notably decreases the traction resistance of the soil.
Detritus removal from a pumping-plant intake chamber with hydrajet pumps
Authors: Muhammadiev M , Urishev B , Juraev S , Boliev A
Published: July 2020

Issues of excessive sedimentation of sediment in the pre-chambers of reclamation pumping stations are important in ensuring their reliable operation. Examinations have established that excessive detritus deposition in the intake part of the chamber complicates the water intake by pumps, increases energy consumption. For the timely cleaning of the intake chamber from detritus, a new device, equipped with a hydrajet pump fed from the pressure pipe of the main pump of the station is proposed. An equation for the pressure-flow characteristics of a water-jet pump used to drain the hydraulic mixture (water + solid mass) based on the of E.A. Sokolov and N.M. Singer methodology and the parameters of the hydrajet pump at given pressure values and the planned value of the flow rate of the solid mass have been obtained. The optimal values of the relative head h = 0.19 and the relative flow q = 0.6. At these values, the efficiency of the installation will be maximum. The results of the experiments carried out according to the estimation design have shown their satisfactory convergence with the calculated data and made possible to determine the optimal pressure and flow parameters of the hydrajet pump from the maximum efficiency.
Contactless galvano-magnetics transducers of monitoring and control systems in agricultural energy
Authors: Plakhtiev A , Denmuhammadiev A , Gaziev G
Published: July 2020

The paper provides information on the state of the use of direct current energy in the electric power industry of agriculture and water resource, hydraulic engineering, industry and metallurgy, irrigation, and land reclamation. Identified the need for contactless non-destructive testing of large constant currents in high-power electrical installations in irrigation, land reclamation, and hydraulic engineering. The basic requirements for contactless transducers and meters of large direct currents in circuits without breaking them are shown. Identified priority areas in the development of these transducers. The general principles of constructing contactless ferromagnetic transducers of large direct currents also the basic requirements for them and the results of the development of one of the options for the development of effective innovative galvano-magnetic contactless transducers of large direct currents with an expanded range of monitoring and control systems for powerful pumping stations in water supply and land reclamation are presented. To increase the sensitivity of galvanomagnetic contactless transducers of large direct currents, Hall transducers have supplied with short-term rectangular current pulses from a special generator. When measuring the amplitude values of the rectified current, in this case of galvanomagnetic contactless transducers, the supply of pulses of the control current of the Hall transducers with the converted current in the bus synchronization is provided. This is achieved by supplying galvano-magnetic contactless transducers of large direct currents with a magnetically controlled contact located near the bus with the converted current and included in the circuit of the current electrodes of the Hall transducers.

A static characteristic of the developed galvano-magnetic contactless transducer of high currents obtained and its main technical characteristics and parameters are given. It is shown that the developed transducer, unlike the known ones, has increased accuracy and sensitivity, a technological design, and low weight and dimensions at low material consumption and cost. It can be widely used in electrical systems in land reclamation and irrigation, in water supply, industry, rail transport, science, technology, and for checking electric meters at the installation site.