bluuebunny/crossref_metadata_2025 huggingface dataset:
Concept design of high interface powerbank
Authors: Gunawan Verry , Christiardy Nicholaus , Purna Irawan Agustinus
Published: July 2020

In this era where technology is the most valuable thing, many people demand a device that can provide multifunctional and high-speed multitasking skill in one simple device. Smartphone came with that technology and so much more advantages. Beside these advantages in smartphone, there are also some disadvantages for example power drain. After an intense study and learning the market needs, we introduce HIPO. HIPO came to cope the problem that happen to smartphone users with its feature as a power bank in a smartphone and its user-friendly interface. With a great feature such as fast charging (3.5 hour), large memory storage up to 256 GB, 32 MP camera, big battery capacity, HIPO will helps you to have your job done anywhere and everywhere without worrying that your smartphone will be run out of power.
Comparison study between nearest neighbor and farthest insert algorithms for solving VRP model using heuristic method approach
Authors: Kosasih Wilson , Ahmad  , Laricha Salomon Lithrone , Febricky
Published: July 2020

In Indonesia, transportation costs from physical distribution still tend to be high because not all business people can optimize their distribution routes. This paper discusses a comparative study between Nearest Neighbor and Farthest Insert algorithms in solving a Vehicle Routing Problem (VRP) model. Aim of this study is to determine the most optimum distribution route so that the distance or time or transportation costs can be minimized. This research was conducted at a bottled water distribution company. In the end, the comparative study was considered effective as a basis for decision making on the distribution route, where there were indications of distance savings or reduced costs, and increased utilization of the higher vehicle fleet.
Personal Performance Measurement of Project Manager using Project Manager Competency Development Framework (PMCDF®) (Case Study PT.XYZ)
Authors: Wahyuni Sarah , Pratami Devi , Fuad Bay Achmad
Published: July 2020

PT. XYZ is a company engaged in telecommunications construction. So far, the company has conducted performance appraisals of its employees using the rating scale method. The assessment conducted by the company is less objective because the assessment is carried out by two supervisors of the object being assessed. In addition, the results are only used for consideration of promotion. The format made by the company also has no KPI or minimum value used in assessing. Based on this, a valuation format and a more objective assessment system are needed with the aim of knowing how the personal competencies of managers. Personal competency measurements are carried out at the project manager level with an assessment format based on PMCDF®, 360 feedbacks as a scoring system, and AHP as weighting on six PMCDF® competencies. From the results of the study, the priority results obtained in the six competencies variable PMCDF® are Managing with a weight of 40%, Leading with a weight of 23%, and Communicating with a weight of 11%. The personal competency score of the project manager for each competence is in good category.
Measurement of Risk Project Maturity Using Organizational Project Management Maturity Model (Opm3): Study Case Of Construction Project In Bandung
Authors: Arif Wijaksono Fanjar , Pratami Devi , Fuad Bay Achmad
Published: July 2020

The issue to project failure has been a common phenomenon to many construction companies. The impact is very critical to companies to which it leads to the late completion of the project and also an over budget. Lack of planning, conducting a lot of changes, and bad executing process are the reasons behind it. If this kept going on, project failure would be a major threat to the companies in which it may drag them to suffer a far greater loss. As a solution, the project maturity assessment comes into existence to put back the projects onto the track and to overcome the project failure. Company XYZ is a construction company to which it conducts a project. It is experiencing issues to which it may potentially be a project failure to it. This research uses the Organizational Project Management Maturity Model (OPM3) as a tool to assess the maturity level of Company XYZ. The specific focus is on the Project Risk Management Knowledge Area. The research is conducted using questionnaire spread across the project team which consists of 1 project manager and 4 project supervisors. At the end, the result of the research shows that the company is in the bad condition of performance. Its maturity level sits in the lowest level. The result also shows that the project team has not met the requirement of the top management.
Design of Procurement Process Monitoring Dashboard for Supporting Food Security Supply Chain Risk Management System in Indonesian Bureau of Logistics
Authors: Aulia Alfazah Detha , Yanuar Ridwan Ari , Yulianti Femi , Giri Artha Kusuma Putu
Published: July 2020

Food Security is a conditon for the fulfillment of food for every people. Rice as one of the main commodities in Indonesia and it can affect a country’s economic stability. The government in Indonesia established Bureau of Logistics (Bulog) to maintain food security. Perum Bulog Subdivre Bandung is one of the regional sub-divisions under the auspices of Perum Bulog which manages the distribution of rice to the five regions of Bandung. Bulog has the duty to maintain the pillars of Food Security including Availability, Accessability and Stability. Rice Procurement process is an important process. To maintain the pillars, Bulog need risk identification in the rice commoditiees procurement prosess using SCOR, FMEA and AHP. there are 12 risk events and 16 risk agents which are divided based on the three pillars of food severity and for mitigation strategies are divided into 3 main causes with 3 alternatives from each main cause. So that in order to facilitate monitoring, a monitoring system dashboard was designed for the Perum Bulog Subdivre Bandung
Analysing Company’s Performance by Using Sustainable Supply Chain Management (SSCM)
Authors: Sembiring Nurhayati , Tambunan Mangara M. , Ginting Elisabeth
Published: July 2020

Due to consider the consumer needs, there is a significant amount of researches about SSCM. The integration of sustainability and SCM is very important to be studied deeply. This paper contains results of analysing content about assessing all journal studies systematically in SSCM literatures which published from 2018 to 2019. Performance of company in economic, environmental and social scope could be analysed by using Sustainable Supply Chain Management. Researches that have done also investigating factors that support SSCM practice. The researchers are positioned to speak to the issue that unexplored to the field of SCM such as policy implications of existing work.
Lean Six Sigma and Business Engineering Perspective of Electrical Energy Optimization
Authors: Chasun Aminuddin , Suratno  , Edi Nugroho Soebandrija Khristian , Indra Wijaya Dendhy , Khair Fauzi
Published: July 2020

This paper combined both theoretical perspective of Lean Six Sigma and Business Engineering; and its managerial implementation within electrical energy company in Middle East. The mentioned company is producing nitrogen gas for the supply purpose of oil, chemical and manufacturing industry processes. Integrative part of this company’s strategic objectives refers to profitability improvement and production performance through escalating company profit. In narrowed down objective scope, it refers to the Electrical Energy Optimization. This paper relates the mentioned company’s empirical and managerial implementation with theoretical perspective of Lean Six Sigma and Business Engineering. Quantitative approach of Lean Six Sigma and Six Sigma are capitalized in this paper’s research methodology to identify problem cause. This paper in particular elaborates the scholar view of Hadid et al (2016) on Lean Six Sigma. The mentioned scholar views within theoretical perspective. It investigates the interaction term between Lean’s social practices and technical practices against the performance measures of financial and operations. This investigation relates to the company’s strategic objectives as unit analysis in this paper. Furthermore, the scholar view of Bärenfänger and Steinbuß (2015) view Business Engineering in its Digital form of Business Engineering as a comprehensive method for digital business model design. Subsequently, data results in this paper convey its interpretation results from production division, which is approximately 81.16% of nitrogen gas that is originated from engine design as its problem cause. To conclude, within Lean Six Sigma and Six Sigma, this paper discussion refers to the value of 1.36 that becomes 2.62 ratio. Specific power of production decreases from 1.45 kw/Nm3 into 0.646 kw/Nm3, as originated from the escalating production of the so called highly impact the company performance versus costs incurred.Ultimately, it is harnessing discussion of the theoretical and managerial implication in this paper.
Carton Sheet Quality Control In Pt. Xyz Using Six Sigma Approach Method With Dmaic Tools
Authors: Ahmad  , Ariyanti Silvi , Widodo Lamto , Cristin Natalina M. G
Published: July 2020

Every industry ensures the existing system in the company runs well and continues to strive so that the products produced are able to meet customer satisfaction. PT. XYZ is a manufacturing company in Purwakarta which is engaged in cardboard boxes. This research was conducted by applying the six sigma method as a quality control product in PT. XYZ in order to reduce disability with DMAIC tools. By controlling the quality of the product that is controlling from the beginning to the distribution of products to consumers. It is known that the average value of waste at PT. XYZ reaches 5.36% which means it needs improvement. In the DPMO calculation it is proven that the company’s sigma value is 3.6 where if you want to raise it to 4 sigma there is a GAP of 0.4 with the largest type of crepe defect. After knowing the average waste and the existing sigma value, a standard improvement was made for the approval of the implementation for the company.
Application Of Quality Control Of Carton Box In Quality Control Department At PT Purinusa Ekapersada
Authors: Puspita Ningrum Clara , Gozali Lina , Widodo Lamto
Published: July 2020

This study aims to identify the cause of defect produced at PT Purinusa Ekapersada. Quality control (QC) is a process to measure the quality of an item by comparing it according to the specifications and requirements asked by the customer, or it can be said also as an effort to maintain the quality of the goods produced in accordance with predetermined specifications based on the customer’s request. The method used to reduce various types of defects produced by PT Purinusa Ekapersada was analyzed using the Pareto diagram to indicate the type of defect and the most of the control chart that produced defects were still within the control limits, a fishbone diagram describe various disabilities, and a 4M1E Why Analuysis to determine the causes and consequences of events.
Modeling of Prediction Bandwidth Density with Backpropagation Neural Network (BPNN) Methods
Authors: Hayat Cynthia , Aang Soenandi Iwan , Limong Samuel , Kurnia Johan
Published: July 2020

Using computer networks in campus area which is open access will cause some problems at the speed to access the information. The allocation of bandwidth that provided sometimes does not match the needs of the client, so it takes an accurate prediction of bandwidth usage. This research obtained that Neural Network backpropagation modeling can solve the problem. The stages of research conducted the stage of training and testing phase. Data training is traffic data weekly and conducted by feed-forward back method, with max error 0.001, max hidden layer neuron 5000, constant momentum 0.95 and increase ratio 0.1. Before the data train is conducted, the scaling of the input and target values in the range of 0.1-0.9, then resumes the denormalization after the data train to return the data into Kb form. The results obtained from the training process in the form of comparison data, training performance, and regression. Furthermore, data testing, conducted by using a network that has been developed from the previous results. The test results are shown in the form of real data and predictive data using 8 input layers. In the prediction process, the mean square error generated is 0.0031792 which indicates a low error rate, so it can be stated that the resulting modeling has a level of output accuracy in predicting the use of computer network bandwidth is very high.
Vowel Recognition Based on Face Images Using Fisher Linear Discriminant Analysis
Authors: Lina  , Arisandi Desi
Published: July 2020

Speech and voice recognition has a wide range of uses across industries, including embedded devices such as in smartphones, dictation and assistance applications, smart cars, and others. The input for a speech recognition system could be in the form of audio signals or visual images. This paper presents a vowel recognition system, as parts of a speech recognition system, from face images using Fisher Linear Discriminant Analysis (FLDA) method. Images of human faces are used as input for the system. The vowel recognition process consists of the Canny edge detection stage for ROI extraction, the FLDA method for feature extraction, and the Euclidean distance calculation for vowel classification. The output of the system is a written vowel character. The experimental results showed that the average success rate for the vowel recognition was 66%, with vowel “i” and “e” achieved 100% recognition accuracies.
Tourism Destination Grouping Systems With Partitioning Clustering Method from Geotagged Photo using Android
Authors: Retnosari Maya , Wasino  , Arisandi Desi
Published: July 2020

This application is focused on grouping photos that have information about the location of the photo. To get the location of the nearest tourism destination is by taking the location coordinate value from the uploaded photo then grouping it with a maximum distance of 1 kilometer. The main location for data collection is in Gunung Kidul Regency. This application uses Android for its development. For data processing and transforming scripts into the JSON file uses PHP and for storing the data uses MySQL.The metadata of the photo contains detail information about the photo. In the application shown the few information of its metadata such as the date and time took, image size and resolution, camera maker and model, also coordinate latitude and longitude. The location and metadata values will be shown in the application and stored in the database. Partitioning Clustering method used to find the nearest place within the 1 km radius. First of all by taking the coordinates value from an uploaded photo and stored to a database. The coordinate must be converted from Degree Minute Second Format into Latitude and Longitude Coordinate. After that, the calculation process starting with uses the Euclidean Distance formula to get the nearest distance of the attractions. To display the nearest location, sorting the result values from a minimum value to the maximum value as the final result. The application could be a reference for tourists who will visit Gunung Kidul Regency.
Travel App - showing nearest tourism site using Haversine formula and directions with Google Maps
Authors: Lee G T S , Arisandi D , Wasino
Published: July 2020

Travel App is a tourism-based application that aims to help travelers in providing easy access information on tourism destinations. It shows nearby tourism sites via Google Maps interface within the application and calculates the nearest tourism site with the help of Haversine formula. It calculates the distance between longitude and latitude of places in a sphere. Tourism data used are gathered directly from Yogyakarta, Indonesia. Not every traveler knows which places to visit or which nearest tourism site they could reach within certain distance and time. This application is able to provide essential travelling information, such as the location of tourist places, their opening and closing hours, address, and photos. Through this app, travelers could explore tourism destinations without being worried not knowing where they could make a stop in their itinerary. Travel App has been tested in the Yogyakarta area and has been shown to deliver its intended functional purposes.
The Influence Of IOT (Internet Of Things) Against Industrial Development In Tanah Abang Market
Authors: Natanael Yorent
Published: July 2020

In the current Millennial era the economic development of a region is strongly influenced by technological developments, millennial words always appear in every public conversation that exists in the Indonesian society, both in terms of education, economy, culture and religion, always highlighting the important role of the millennial generation. Not separated from technology Digital lifestyles also affect the types of jobs, many new jobs emerge that are compatible with the millennial era. The work that is desired by the current generation is a more exciting job than the generation of old. Such as Online shop, Online Transportation, You tuber, or Online Business Program, this term we may often hear lately. But did you know that now an online business is one industry with potential business potential. This happens along with the times.
Aluminum Frame Product Development Using Quality Function Deployment and Value Engineering at PT KSN
Authors: Perdana Surya , Usman Ridwan , Fatimah Hunusalela Zeny
Published: July 2020

PT KSN as an aluminum frame supplier for apartment residential buildings and office buildings faces various demands from consumers. At present there is no standard design for aluminum jamb products, so the modification of the jamb creates an expensive price which makes it difficult for companies to compete with similar manufacturers. The analysis used in this research is Quality Function Deployment (QFD) and Value Engineering (VE). The determination of the technical specifications of the protruding shape and width of the glass grove is carried out using the PT KSN design rules based on the existing gasket type. some new investment attributes are needed, namely concerning the investment component Dies, the cost of the Design process, CAM programming, and the CAM manufacturing process. Installation of glass with gaskets and without using sealants the installation process is more efficient, easy and safe, the use of aluminum material can be reduced so that production costs are lower and the proposed price offered by consumers is more competitive.
The hydro-ecological state assessment of piedmont rivers of the Republic of Uzbekistan in the climate change context
Authors: Akhmedova T , Akramova I , Radjabov A , Mavlyanova D , Baymanov R
Published: July 2020

This article describes the dynamics of the spatial and temporal distribution of pollutants and the main sources of surface water pollution by household and industrial wastewater. It emphasizes that water pollution increases from the headwaters to the river mouth, and in lower reaches of the river, there is not natural river water, but wastewater. Industrial, household and agricultural wastewaters discharged into water bodies without treatment, or often after inefficient treatment, change the hydro-chemical and hydro-biological regimes that affect the quality of water and disrupt the normal functions of aquatic flora and fauna. The data obtained from 1991 to 2019 were used as the basis for this article.
Influence of the shape of the pressureless trapezoidal channel and roughness on the pressure loss of the machine channels of the pumping stations
Authors: Uralov B , Saidkhodjaeva D , Kurbonova U , Baymanov R
Published: July 2020

In this work, we consider the general equation of fluid motion in pressureless channels and the functional dependences of the coefficient of hydraulic friction on the Reynolds number, relative roughness, and the shape of the live section of the channel, as well as the resistance formulas for the simplest channels with respect to the cross-sectional shape (round and infinitely wide rectangular), and then for channels with a more complex cross-sectional shape. To take into account the effect (on the pressure loss) of the channel cross-sectional shape and the presence of a flow with a free surface in it, additional correction factors are introduced (using the hydraulic radius concept). In conclusion, it is concluded that the values of the mentioned correction factors can and should be refined only as a result of the relevant experiments. The work also examined the patterns of hydraulic resistance in engine channels of the correct form of a live section with uniform turbulent fluid motion. Formulas of hydraulic resistance in the machine channels of a simple and complex outline of a live section are given.
Filtration characteristics of pressure pipelines previous being in operation
Authors: Loktionova E , Miftakhova D , Yaroslavtseva E
Published: July 2020

The issue of changing the hydraulic characteristics of the pipelines previous being in operation is of great practical importance. To determine convenient objective parameters for assessing the reduction in pipeline throughput during their operation the experimental studies results of three sections of the pressure pipeline with artificial clogging were presented. It is shown that for pipelines with the same initial resistance at the same degree of clogging, the numerical values of the resistance coefficients are practically independent of the ratio of length to diameter. The rationale for the transition from traditional hydraulic resistance coefficients to filtration coefficients was given. The dependence of the relative filtration coefficient on the clogging degree is recommended as a universal characteristic of the throughput of pressure pipelines previous being in operation. It is proved that with small degrees of clogging, a relative decrease in the pipeline throughput occurs more intensively than with large degrees of clogging.
Development of Energy-Saving Modes of Irrigation Pump Stations
Authors: Ergashev R , Azizov O , Dehkanova N , Bozorov A
Published: July 2020

The article substantiates the need to develop energy-saving modes of large irrigation pumping stations and pumping units. The Object studies are centrifugal pumps residing in usages on the pumping station of the Republic. In the process of performing, the studies were used main positions theoretical mechanical engineers, hydraulics, theories blade pump, processing result field and laboratory experiment, graphic and analytical methods. The Purpose thesis work is increasing to efficiency to usages centrifugal pump irrigation systems by development scientifically-motivated ways of the discovery rational state of working and complex action on increasing of the working factors them, on the base of the use theoretical bases motivations factor, influencing upon the intensity of wear-out details pump and improvements of the hydraulic processes in running part pump unit. The new features of the pump is designed on the base of the methods calculation corner of the entry and output of working water travel about changed designs of the pump. The substantiation of technological, environmental factors is given. Considering that are pumping units are energy-consuming objects, recommendations are given on upgrading the flow part of the pumps.
Hydraulic elevator for cleaning sediment of a water outlet of a reservoir
Authors: Shaazizov F , Badalov A , Shukurov D , Yulchiev D
Published: July 2020

Many scientists of the world were engaged in the study and development of various schemes and models of hydraulic elevators for the purpose of excavation and hydraulic transport of hydraulic mixtures [1-22]. For the specific conditions of the selected research object, we determined the main sizes and parameters of the hydraulic elevator, which allows cleaning the water area of the bottom water intake of the spillway of the Tupalang hydroelectric station, using the hydrostatic pressure at the object concentrated in front of its dam. To clarify the particle size distribution of sediment deposited at the inlet head of the water intake of the Tupalang reservoir water outlet, samples of bottom sediments were taken and their particle size distribution was analyzed in laboratory conditions. At the water intake area of the 1st tier of the Tupalang reservoir, the deposited sediments are represented by smaller particles, the diameter of which is from 5 mm to 0.1 mm, and in percentage terms, their share is 95%. The main results are given for calculating and justifying the parameters of a hydraulic elevator for cleaning sediment from the water area of the inlet head of the water outlet structure of the first tier of the Tupalang reservoir. When determining and substantiating the main sizes of the hydraulic elevator, theoretical and experimental research methods were used, and the method of S.M.Shtin was applied.
FLOW-3D software for substantiation the layout of the port water area
Authors: Pan B , Belyaev N
Published: July 2020

It is necessary to exclude the occurrence of significant waves in the inner water area of the port and at the berthing facilities when designing breakwaters. The article presents the results of the calculations of water movement in the harbor area. The most secure options for the location of the port entrance and its size for a given object were identified. The possibility of using the FLOW – 3D program to select planned and constructive solutions at the stage of the preliminary layout of the port water area is substantiated.
Underground pipeline strength under non-one-dimensional motion
Authors: Sultanov K , Khusanov B , Rikhsieva B
Published: July 2020

This paper is devoted to the development of a method for determining longitudinal stresses in underground pipelines under periodic dynamic load, taking into account the complex process of pipe-soil interaction. The method is based on the solution of a two-dimensional axisymmetric unsteady wave problem for the “underground pipeline-soil” system. In this case, the pipeline and soil are taken as linearly deformable bodies. On the surface of their contact, the force of interaction (the friction) is determined from a two-stage (pre-limit and limit) law. The problem is solved numerically - by the finite difference method according to the Wilkins scheme. The changes in longitudinal stresses, velocities, and displacements over time were obtained for various sections of the pipeline and soil. An analysis of the results of numerical calculations showed that when a plane wave propagates along a pipeline with external friction, the hypothesis of flat sections is practically met, which justifies the regularity of considering similar problems in a one-dimensional statement. A multiple increase in the values of longitudinal stresses in the pipeline as compared to the same stresses in soil has been established. The maximum possible value of the stress growth is determined depending on the physic mechanical properties of the pipe material and soil. The role of the interaction force (the friction force) in the multiple increase in longitudinal dynamic stresses in underground pipelines under the effect of dynamic loads was determined.
Earthquakes and seismic safety of waterworks facilities in the Central Asian region
Authors: Akhmedov M , Juraev D , Khazratkulov I
Published: July 2020

Central Asian region is an earthquake prone zone. At water management engineering, one of the central and great role play dams, water supply systems, etc. The seismic safety of these objects has great importance. In areas subject to seismic effect, the cases were observed when such structures were significantly damaged, and in some cases even destroyed. It leads to the long-term shutdown of the main water supply systems and it causing great material losses. The main aim of the issue is an analysis of the effects of strong earthquakes for waterworks facilities, proposing measures that are necessary for the urgent determination of the technical condition of an operating structure and the development of recommendations for further safe operation. There were considered lessons from past events also and strategies for sustainable development in the future by taking into account local features.
Diagnostic tests of vertical pumps modernized pump stations
Authors: Glovatsky O , Azizov O , Shamayramov M , Bekchanov F , Gazaryan A , Ismoilov N
Published: July 2020

The article discusses the methods of maintenance and technical diagnostics of large vertical pumping units of modernized pumping stations of the largest cascades of the Amu-Bukhara and Karshi channels to ensure reliability during their operation, assesses the qualitative and quantitative changes in their modes. The operation of large pumping stations poses a number of problems that cannot be solved without experimental studies. The aim of the research is the problem of comprehensive diagnostics of pumping units and the development of new export-oriented diagnostic devices. The use of new designs of pumping power and diagnostic equipment involves the use of mathematical modeling of control of the operating modes of machine channels, which gives significant savings. Methods of accounting for cavitation – hydroabrasive wear of the blades are based on the study of the movement of the hydroabrasive flow along the radius of the impeller. Recommended elimination of pump operating modes with a maximum wear rate of their parts.
Interaction of a rigid underground pipeline with elastic-viscous-plastic soil
Authors: Sultanov K , Khusanov B , Rikhsieva B
Published: July 2020

The results of numerical solutions of an axisymmetric two-dimensional problem of a rigid underground pipeline interaction with elastic-viscous-plastic soil are presented. The pipe-soil interaction begins when the underground pipeline moves in an axial (longitudinal) direction. The changes in velocity, displacement, shear stress, shear strains in the direction of the pipeline axis for fixed points of soil along the radial axis are obtained at a linear change in the given longitudinal velocity of the pipeline from zero to a certain constant value. An analysis of numerical results showed that the changes in the interaction force on the contact soil layer occur according to a two-link law with the manifestation of the peak value of shear stresses. When the pipeline moves at a constant velocity, the values of displacement over time increase, and the shear stress values remain constant. Obviously, at this stage, the Coulomb law is fulfilled. This result agrees with the results of known experiments. The obtained theoretical dependences of shear stresses on soil displacement relative to the underground pipeline reveal the formation mechanisms of the conditions for the underground pipelines - soil interaction. This result could not be obtained within the framework of the one-dimensional problem of the pipe - soil interaction.
Assessment of Chimkurgan water reservoir sedimentation processes
Authors: Gapparov F , Nazaraliev D , Eshkuvatov Q
Published: July 2020

Uzbekistan is an inland country with very dry summers and cold winters. The main course of the economy is agriculture. There are two basic kinds of agriculture in terms of irrigation: rainfed and artificial irrigation systems. Therefore, in long dry summers it is reasonable to build water reservoirs to keep enough water resources for vegetation period. Because of sedimentation transport water reservoirs sometimes quickly filled with sediment. Estimating the effects of potential sediment accumulation in reservoirs is an important element in the planning of the dam project. Sediment accumulation in a reservoir may reduce the useful storage of water in this reservoir, change the water quality near the dam, increase flooding level upstream of the dam due to sediment aggradation, influence the stability of the stream downstream of the dam, affect stream ecology in the dam region, etc. This article provides a correlation between the reservoir volume reduction from the bottom to a given level, based on the amount of water flowing into the Chimkurgan reservoir and the river basin monitoring data. Based on the results of observations and calculations, the current state of the reservoir was formed on the basis of GIS tools. In the first step we constructed a flow duration curve, which is the cumulative distribution curve of the stream runoff passing the dam.
Underground pipelines dynamics problem solution under longitudinal seismic loading
Authors: Bekmirzaev D , Mansurova N , Nishonov N , Kosimov E , Numonov A
Published: July 2020

In this article are considered some problems of oscillations of underground pipelines under seismic loading. The resulting system of equations is solved by the finite-difference of the second order of accuracy. The program is based on a computer algorithm implementation on oriented language Borland Delphi 7. Conducted theoretical and computational-experimental studies solve the problem of assessing the stress-strain state of underground pipelines under seismic effect the axes of the pipeline. The Stress-strain state of the underground pipeline is studied at linear and non-linear interaction with the soil. Linear and non-linear solutions are compared. Dangerous points of maximum normal stress occurrence under seismic loading in the underground pipeline are determined to take into account elastic pipe-soil system interaction. The conducted computational and experimental studies allow solving the problems of assessing the stress-strain state of pipelines under seismic loading, which is important for practical calculations.
Forebays of the poligonal cross-section of the irrigating pumping station
Authors: Matyakubov B , Mamajonov M , Shakirov B , Teplova G , Shakirov B
Published: July 2020

The article discusses the use of the design of the forebays of a polygonal cross-section to improve the hydraulic characteristics of the water intake structures of pumping stations, in which the longitudinal slope in the direction of the middle chamber is i = 0.1, the adjacent longitudinal slope is 0.15 and with the extreme chambers the longitudinal the slope is 0.2. The faces of each chamber with a forebay have a transverse slope equal to i

c

= 0.1 and the angle of taper of the forebays in the plan is α = 35°. In the joint operation of 5 pumps, for the forebays of a polygonal cross-section, the total resistance coefficient is ∑ξ
total ext.
= 0.568 and for a typical ∑ξ
total ext.
= 0.72. With the simultaneous operation of 5 pumps, the average supply of 3 pumps is 0.0051 m3/s, 2, and 4 pumps, respectively 0.00498 … 0.00504 m

3

/s, for 1 and 5 pumps, 0.00478, and 0.00481 m

3

/s, respectively at the extreme pumps, the flow rate increases by 4.9…6.3% relative to the standard forebays.
Hydraulic research results for cantilever spillway at Hydroelectric power station 2 of Chirchik – Bossuv waterway
Authors: Khusankhudzaev U , Jahonov A
Published: July 2020

To date, in the water sector, such urgent problems of our time as the observed decrease in the reliability and safety of hydraulic structures and their individual elements are highlighted. The level of effectiveness of water distribution management and the timely supply of electricity to consumers depends on the stable operation of the entire hydraulic complex. Water management construction is very material-intensive and requires constant expenditures of material and energy resources to maintain the level of stable operation. However, in the event of an emergency at hydroelectric power station facilities, it is extremely difficult to provide the necessary resources for carrying out restoration work on time. In the practice of hydraulic engineering, various designs of cantilevered spillways have been widely used. Reliability and trouble-free operation of such spillway structures with the conjugation of downstream divers by a jet largely depend on perfection. This article discusses the problems of local erosion in the downstream of hydraulic structures, sets out the results of experimental studies to determine the depth of local erosion behind a cantilever spillway in the outlet channel with recommendations on its end structure.
Evaluation of ASTER DEM and SRTM DEM data for determining the area and volume of the water reservoir
Authors: Khasanov Kh
Published: July 2020

Nowadays, like many other fields, Digital Elevation Models (DEM) are widely used in the field of hydrotechnical engineering. In this study, the vertical accuracy of the Shuttle Radar Topography Mission (SRTM DEM) was compared to Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER DEM) for the area recommended for the construction of the Kyzylsay and Tashtepa water reservoirs in Tashkent region, Uzbekistan. Vertical differences between SRTM and ASTER products were computed the root mean squared error (RMSE) compared to GPS data. Results show that SRTM based measurements of ground control points (GCPs) exhibit RMSE of 4.262 m while ASTER DEM based measurements exhibits and RMSE of 3.693 m for the Toshtepa Reservoir located in the plain, and for the Kyzylsay reservoir located in the mountains, RMSE results show that 12.82 m for SRTM, 15.77 m for ASTER. There are SRTM DEM outperforms ASTER DEM in detecting vertical accuracy. This indicates that ASTER DEM outperforms SRTM DEM in detecting vertical accuracy for the plane, and SRTM DEM is preferable than ASTER DEM for mountainous areas. The longitudinal profiles of dams (Kyzylsay and Tashtepa) of all DEMs are compared with the geodetic data of the design institute - UzGIP. The area and volume of the reservoir were determined using the digital model were compared with the data of the design institute - UzGIP performed using a geodetic tablet.
Land use by transport infrastructure in Tashkent City
Authors: Shipilova K , Radkevich M , Tsoy V , Shoergashova Sh , Vildanova L , Gapirov A
Published: July 2020

Achieving environmental sustainability of transport largely depends on the degree of use of urban land by transport infrastructure. The article studies the indicator “land use” in Tashkent to the target 2030. The following criteria were selected as assessment criteria: the area and degree of filling of public parking lots, the area of transport infrastructure enterprises, as well as the length of roads with two-sided landscaping. Evaluation of indicators was carried out using GIS, by processing satellite maps of Tashkent in the Quantum GIS program, as well as by monitoring online maps of the movement of automobile transport. It was revealed that the existing area of public parking is 33.4% of the required area, while the degree of use of existing parking is only 40-60%. Bilateral landscaping, have only 26.6% of roads. Trends in the development of the Tashkent transport system suggest mainly an increase in the number of private cars (an increase of 1.23 times by 2025), the pace of construction of parking lots and improvements in the road-street network are significantly behind (an increase in the area of parking lots by 1.06 times by 2025). In the current state of development, the stability of transport until 2030 according to the criterion of “land use” is not provided.
Matlab-model of a solar photovoltaic station integrated with a local electrical network
Authors: Sapaev I , Saitov E , Zoxidov N , Kamanov B
Published: July 2020

This article considers a model of a solar photovoltaic station (PVS) integrated with a local electrical network on the example of a 20 kW PVS installed in the building of the Tashkent State Technical University named after Islom Karimov. The Basic SIMULINK model of an equivalent PVS was used for analysis and comparison of PVS parameters. It is shown that the parameters for the mathematical model match the experimental parameters obtained under natural operating conditions at remarkable points. This model of PVS will serve as an experimental and laboratory stand in the teaching of students of the University for the subject “Renewable energy sources” (RES).
Designing of light traps, monitoring, and also pests control on its basis
Authors: Erkinov Z , Beknazarova Z , Turaeva G , Khudayarov M
Published: July 2020

The following article is given data about the construction of light-traps working on a semi-automatized or autonomic regime, and also about carrying out the monitoring of identification of the phase of pests’ development and control them with the given light-traps. Given light-trap was created on the basis of the latest achievements of science with the help of semiconducting materials. The device constructed from semi-conducted light-diodes, relay of twilight, and solar batteries assembled of silicium, which is concerned as a typical semiconducting material, and also from accumulating batteries. It is shown that the given method of conducting monitorings and pests’ control is ecologically healthy, hands down to use, and easy in transportation. The method allows getting objective information about kind and sex type, date and dynamics of flying out, egg-laying formation, and fertility of many kinds of agricultural pests and trapping pests with little waste of time and resources.
Optimization of power flow through facts in electrical networks
Authors: Khamidov Sh , Normuratov B , Pulatov B , Kilichov O
Published: July 2020

A mathematical model is presented for optimizing power flows in an electric network with a flexible controlled alternating current power transmission device - FACTS. The range of questions on the problem of optimizing the power flow in electric networks with one of the FACTS devices, the SVC static power factor compensator, has been expanded and investigated. The Lagrange function for the SVC device is proposed, which serves as the basis for obtaining a linearized equation and determining the optimum of the objective function.

The method and algorithm of the optimization problem in the electric power system containing devices of the FACTS technology have been synthesized. The mathematical model allows for flexible and reliable optimization of the electrical power system. Flexibility is explained by the universality of the model, and reliability is explained by the high convergence rate of the Newton method used.
Modeling of kinematics and kinetostatics of planetary-lever mechanism
Authors: Karimov R , Begimov N , Sadullaev Sh , Urinov B , Turajonov K , Ibodulloev Sh
Published: July 2020

The article provides analytical formulas for determining the kinematic parameters of a planetary-lever mechanism with one and two degrees of mobility. The obtained formulas were realized on a computer, in the program Math CAD 15. According to the results of calculations on a computer, regularities were established for the change in the kinematic parameters of the links of the mechanisms under consideration. The influence of the direction and magnitude of the angular velocity of the central wheel on the kinematic characteristics of the planetary-lever mechanism with two degrees of mobility has been determined. Formulas are created to determine the reaction in kinematic pairs of a planetary-lever mechanism with one degree of motility. Based on the calculation results and analysis provided, regularities of the reaction change in the kinematic pairs, as well as balancing moments in the carrier, were established during the basic geometric parameters of this mechanism were varied.
The machine for the preparation of the soil in sowing of plow crops under film
Authors: Ravshanov K , Fayzullaev K , Ismoilov I , Irgashev D , Mamatov S , Mardonov Sh
Published: July 2020

In the world much attention is paid to the development and application of machines that perform all technological processes of soil cultivation and preparation of soil for sowing crops in one pass on the field. The aim of the research is to substantiate the constructive scheme and mutual arrangement of the working elements of the machine for preparing the soil for sowing melon crops under the tunnel-type film. The authors proposed new technology for preparing the soil for sowing melon crops under the film of the tunnel type in one pass of the machine, including the surface loosening of the covered soil, milling-free loosening and formation of irrigation furrow along the axis of symmetry of the sowing zone, preparing the strip of soil for sowing melon crops under the film of the tunnel type. The design of the developed combined machine for the realization of the offered technology is resulted. The basic principles and methods of classical mechanics, mathematical analysis, and statistics were used in this study. It is established that the most optimal design scheme of the machine is considered to be a scheme with a sequential installation of a lancet leg, pairs of deep loosening machines, furrow cutters, and rotary working elements inclined to each other. It is theoretically proved that qualitative preparation of the field for sowing melons with minimum energy consumption is provided with the longitudinal distance between the deep loosened and the lancet leg of 40 cm, the transverse distance between the deep loosened and the support wheel of 10 cm, the longitudinal distance between the deep loosened and the furrow cutter of 50,6 cm, the longitudinal distance between the furrow cutter and the rotary working device of 123 cm.
Advance of spindle drum and frontality of active spindle surface
Authors: Rizaev A , Yuldashev A , Kuldoshev D , Abdillaev T , Ashurov N
Published: July 2020

Harvesting machines of modern cotton pickers are equipped with spindle drums, making rotational movements against the direction of machine motion. To ensure the natural position of the bushes with bolls in the working area of the vertical spindle apparatus, the linear speeds of the spindle centers on the drums advance the speed of the machine. The aim of the paper is to develop a methodology for calculating the lead coefficient depending on the parameters of the drum, spindle, its activity, and frontal location, where the active surface of the spindle should be located opposite the cotton plant. Specific recommendations are given for calculating the operating modes of a cotton picker.
Drying agent spreading in stack of drying material
Authors: Umarov G , Buronov Sh , Amonov M , Mirzalieva E , Tulaganov B
Published: July 2020

This article analysis of drying agent’s spreading in ventilated drying of stem type agricultural crops and vegetable seeds, through which it aims to produce more and more high-quality products. The similar drying was not observed in different parts of the crops in ventilated drying, some parts of the drying product were dried out but some parts not dried well. The aims of the paper study this process. Therefore, products must be placed in the dryer with the thickness to have each point dry at the same time. Based on the practical experience of this criterion, the determination of loading thickness in drying was carried out theoretical analysis by using analytical dependencies. Theoretical analysis and analytical dependencies allow determining dimensions of the stack, layer thickness
Improvement of properties of oils used in hydraulic systems of road-construction equipment
Authors: Alimova Z , Kholikova N , Kholova S
Published: July 2020

This article proposes ways to improve the operational properties of hydraulic oils used in road construction equipment. Hydraulic oils with additives in the form of metal dithiophosphates or orthophosphoric esters can provide reduced wear of hydraulic elements.

We research samples of industrial oils MG – 30, and samples with the addition of zinc dithiophosphate additives DC – 40. The antiwear effect of such compounds occurs due to the adsorption of the metal surface with the formation of sufficiently strong compounds with the metal. In the presence of oxygen, the reactivity of sulfur compounds with respect to the metal decreases, but an increase in the antiwear properties of the compounds is observed mainly under moderate friction conditions.

The results of laboratory studies of MG-30 hydraulic oils with an additive based on zinc dithiophosphate DC – 7 and recommendations for their use are presented.