Distribution Of Pressure And Specific Energy In The Twirled Stream For Confusor,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Distribution Of Pressure And Specific Energy In The Twirled Stream For Confusor, A.A. Yangiev, D.S. Adjimuratov
Irrigation and Melioration
Article brings up the advantage of confusor part application in outflow part of vortex spillway, which may be more rational from the point of view of providing non-cavitation operation of flow swirler. Analytical design method and program developed is given of pressure and specific energy for aerated part of swirled flow in vortex spillway confusor part, which match with experimental results, it allows for fast and quite accurate realization of distribution analysis for pressure and specific energy in swirled flow along the length of the confusor for various rates of taper.
Economic Assesment Of The Impact Of Climate Factors On Wheat Yield In Samarkand Region,
2020
Tashkent State Agrarian University
Economic Assesment Of The Impact Of Climate Factors On Wheat Yield In Samarkand Region, Sh.B. Babakholov
Irrigation and Melioration
Agricultural production is highly vulnerable to climate shocks and predicted climate consequences may pose severe challenges to the resilience of Uzbek agricultural system, especially in terms of food security and income stability of rural producers. In this context, present study proposed to assess the impact of climate factors, such particular changes in mean temperature and rainfalls on total output of wheat-cultivating farmers in Samarkand region. By considering irrigation source and heterogeneous geography of the region, farmers engaged in wheat production were analyzed in two: upstream and downstream zones using Fixed effect panel approach. The empirical findings of study revealed that, …
Change In Level Water In Pumping-Plant Intake,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Change In Level Water In Pumping-Plant Intake, R.R. Ergashev, B.T. Xolbutayev
Irrigation and Melioration
A decrease in the water level in the pump chamber of the pumping stations leads to the formation of whirlpools in front of the suction pipes. As a result of air intake, the pump unit operates in cavitation mode and their intensive wear occurs. As the data obtained from the Karshi machine channel show, mainly a decrease in design water levels in the downstream waters is observed at the first pumping station. Depending on the number of simultaneously operating pumping units, the minimum water level in the head pumping station should be from 4.5 m to 5.7 m. The received …
Modeling The Impact Of Changes In The Ground Water Level On The Stability Of Agricultural Landscapes Using Gis,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Modeling The Impact Of Changes In The Ground Water Level On The Stability Of Agricultural Landscapes Using Gis, A.M. Arifjanov, L.N. Samiev, F.K. Babajanov, G.M. Xamdamova, Sh.N. Yusupov
Irrigation and Melioration
The article presents modern GIS methods for determining the stability of changes in irrigated areas and the depth of the ground water level.the most correct solutions are given in modeling this process. To distinguish agricultural landscapes, the classification of agricultural acreage in the lower part of the Amu Darya river region was made using 16-day periodic rasters 2017 of 2018 and the NDIS MOD13Q1 sensor of agricultural acreage, type NDVI. The annual change in the level of underground water in relation to the state of rivers and channels is analyzed. A steady change in agricultural acreage on the right Bank …
Determination And Assessment Of The Spatio-Temporal Changing Dynamics In The Groundwater Level And Mineralization In Irrigated Areas Under Climate Change (As An Example Of Syrdarya Province),
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Determination And Assessment Of The Spatio-Temporal Changing Dynamics In The Groundwater Level And Mineralization In Irrigated Areas Under Climate Change (As An Example Of Syrdarya Province), S. Khasanov, S. Adilov, R. Kulmatov
Irrigation and Melioration
In the irrigated lands of the Aral Sea Basin, salinization processes are taking place as a result of rising groundwater levels and increasing its mineralization due to the unsustainable use of water and land resources. This, in turn, leads to the withdrawing of arable land and a decrease in crop yields. This is especially the case in the irrigated areas of the lower reaches of the Amudarya and Syrdarya rivers, located in Uzbekistan, southern Kazakhstan, and Turkmenistan. This research was aimed to learn and evaluate the long-term changing behavior of groundwater level and mineralization in the irrigated areas of the …
Increasing The Efficiency Of Water Distribution Management When Operating Pumping Stations Of The Irrigation System,
2020
Research Institute of Irrigation and Water Problems
Increasing The Efficiency Of Water Distribution Management When Operating Pumping Stations Of The Irrigation System, O.Y. Glovatsky, R.R. Ergashev, B. Hamdamov, N.M. Ismailov, B.T. Kholbutaev
Irrigation and Melioration
The article is to control the parameters of the unsteady movement of water in the canals and the pumping station, which ensure the maintenance of the specified operating modes of the pumping stations under non-stationary conditions. To achieve this goal, it is necessary to solve the problems of coordinating the operating modes of the units of the head pumping station (PS) with the operating modes of the partitioning structures in the conditions of emptying and filling the ponds of the main canal with water. The article discusses the implementation of the method of water distribution control on the mathematical model …
Analysis Of Theoretical And Natural Field Studies Of Reservoir Silling,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Analysis Of Theoretical And Natural Field Studies Of Reservoir Silling, A.M. Arifjanov, F. Gapparov, T.U. Apakhujayeva, S.N. Xoshimov
Irrigation and Melioration
The article developed a mathematical model of the processes of siltation of reservoirs, taking into account the energy state of the flow, and proposed a calculation method. In the process of siltation of the reservoir, the dependence of the volume on the change in the water level in the reservoir was estimated. On the basis of studies carried out in full-scale field conditions, the recommended calculation method is comparatively evaluated and analyzed. Field studies were carried out in the Chimkurgan, Tashkent and Yuzhno-Surkhan reservoirs. A relationship is obtained that expresses the dependence of the relative volume of siltation of the …
Planed Dimension Of Flow Deformed By A Single Dam That Is Impermeable To Water From The Body,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Planed Dimension Of Flow Deformed By A Single Dam That Is Impermeable To Water From The Body, M.R. Bakiev, K.T. Yakubov, I.J. Asamatdinov
Irrigation and Melioration
Coastal erosion is a type of water erosion that causes significant damage to the national economy each year: leaching of overland coastal crops, failure of protective dams, destruction of irrigation canals, dilapidated buildings and structures, among others. To combat leaching, cross-dams are used which are waterproof and water-permeable. The aim of this work was to develop a method for calculating the planned dimension of compressed flow with a transverse dam, which included comparing the lengths of the upper and lower tilt zones, the boundaries of individual zones and the results of research in the laboratory and in nature. According to …
Research Of Energy Indicators Of Electric Drives With Frequency Converters (Frequency Converters) On The Operating Equipment Of Cotton Cleaning Plants,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Research Of Energy Indicators Of Electric Drives With Frequency Converters (Frequency Converters) On The Operating Equipment Of Cotton Cleaning Plants, A.J. Isakov, B.K. Tukhtamishev, J.N. Tolipov
Irrigation and Melioration
The article deals with the theoretical and practical substantiation of the replacement of an unregulated electric drive of the main technological equipment of cotton refineries with a frequency-controlled electric drive. The influence of a change in the load on the motor shaft on the main parameters of the steady state is considered. In an asynchronous motor, with an increase in the load, slip increases to such a value at which the torque of the motor balances the increased moment of resistance. Considering that when the stator slip resistance is less than the critical one is a small fraction of the …
Stabilization Of Discharge Processes Involved In Electrical Fields Of Electrostatic Precipitators,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Stabilization Of Discharge Processes Involved In Electrical Fields Of Electrostatic Precipitators, Sh.M. Muzafarov, B.N. Erkinov, A.I. Pardaev, V.E. Baliskiy, B.К. Tаgaev
Irrigation and Melioration
The article provides information on achievements in the field of electrical gas cleaning. A critical analysis of the principle of operation of the electrostatic precipitators developed and currently in operation is carried out. The possibility of increasing the efficiency of electrical gas cleaning using unipolar voltage pulses is analyzed. A theoretical analysis of the processes in the discharge gap was carried out using the existing theory of electric discharges in gases. Based on the analysis of the data, the discharge mechanism is established in a sharply inhomogeneous electric field at a pulsed voltage. It is established that when using voltage …
Determination Of The Rational Values Of The Parameters Of The Disc Rollers Of The Combined Unit,
2020
Tashkent Institute of Irrigation and Agricultural Mechanization Engineers
Determination Of The Rational Values Of The Parameters Of The Disc Rollers Of The Combined Unit, A.K. Igamberdiev, D.K. Muqimova
Irrigation and Melioration
In our country, repeated crops are sown in newly plowed lands. In such conditions, the use of combined units that perform several technological operations simultaneously in one pass is considered effective. However, due to the inadequacy and validity of the parameters of the working bodies for the quality of pre-sowing tillage in newly plowed lands, there is an increase in the number of passes, fuel consumption, loss of soil moisture and other costs and, as a result, the possibility of timely sowing and friendly germination of repeated crops is reduced . The rational parameters of the new design of disk …
Autonomous Photovoltaic System For Year-Round Guarantee Supply Of Electricity To Rural Facilities,
2020
Physical-technical institute of SPA “Physics-Sun” of the Academy of Science of Uzbekistan
Autonomous Photovoltaic System For Year-Round Guarantee Supply Of Electricity To Rural Facilities, M.N. Tursunov, Х. Sabirov, U.R. Kholov, Т.Z. Аkhtamov
Irrigation and Melioration
The article discusses the physical and technical features of the experimental results of studying the parameters of an autonomous photovoltaic station (AFES) with a power of 2600 W designed and manufactured on the basis of 16 photovoltaic batteries made of polycrystalline silicon with an efficiency of 15.6 %. It is shown that an autonomous photovoltaic efficiently and reliably provides electric energy a lighting system for car parking in the winter season (January and February) and it is planned to lift water from a well with a depth of 70-80 m for irrigation and maintenance of the Heliopoligon from April 2020. …
Analysis Of Semi-Arid Riparian Environments Using Satellite Imagery,
2020
Montana Tech
Analysis Of Semi-Arid Riparian Environments Using Satellite Imagery, Kira Overin
Graduate Theses & Non-Theses
Semi-arid riparian environments are at risk of being over-exploited or degraded due to increased water usage associated with growing housing demands. Trends surrounding these developments can be monitored using freely available Landsat satellite imagery in conjunction with seasonal stream discharge rates. This project focuses on a stream system located southwest of Ennis, Montana, where population is growing rapidly. It aims to characterize the connection between variable discharge rates in small-scale riparian environments and adjoining vegetation health, while considering possible implications of continued urbanization. Methods for preventing riparian ecosystem degradation and promoting resilience are also discussed.
Engaging Farmers And The Agriculture Industry Through The Testing Agricultural Performance Solutions Program,
2020
University of Nebraska-Lincoln
Engaging Farmers And The Agriculture Industry Through The Testing Agricultural Performance Solutions Program, Charles A. Burr, Daran Rudnick, Matt Stockton, Robert Tigner, Krystle Rhoades
Department of Agricultural and Biological Systems Engineering: Faculty Publications
The University of Nebraska–Lincoln Testing Agricultural Performance Solutions (TAPS) program involves use of farm management competitions to increase engagement across producers, industry, and universities.Participants make several management decisions throughout the growing season in a controlled field trial held at the university research station. Results are analyzed, and awards are presented for most profitable farm, most efficient farm, and farm with the greatest grain yield. The TAPS program involves several techniques for facilitating participatory assistance, including two-way communication and transformational learning. It has resulted in participants' questioning their past management decisions and realizing that they need to improve their marketing skills …
Introduction To Special Issue Of Irrigation Science: Improving Irrigation Management Across The Ogallala Aquifer, Usa,
2020
Colorado State University
Introduction To Special Issue Of Irrigation Science: Improving Irrigation Management Across The Ogallala Aquifer, Usa, Allan A. Andales, Daran Rudnick, José L. Chávez
Department of Agricultural and Biological Systems Engineering: Faculty Publications
Groundwater stored in aquifers is a major source of irrigation water for many agricultural regions that receive insufficient precipitation for crop production. In the U.S.A., the High Plains aquifer (HPA) that underlies parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming supplies irrigation water for agricultural production. The HPA underlies around 450,658 km2 (174,000 mi2) of which the Ogallala aquifer is the principal geologic formation underlying 347,059 km2 (134,000 mi2) (Gutentag et al. 1984). The Ogallala aquifer is primarily a water table (unconfined) aquifer with saturated thickness ranging from 0 …
The Seasonal Effects Of Photovoltaic Cells On Sedum Eco Roof Substrate Moisture,
2020
Portland State University
The Seasonal Effects Of Photovoltaic Cells On Sedum Eco Roof Substrate Moisture, Brook M. Thompson
University Honors Theses
This paper investigates a combined PV eco roof system and analyzes the soil moisture levels in front of the panels and directly underneath the PV Cells on an experimental ecoroof platform in Portland, Oregon. The purpose of the study was to examine how PV Cells create differences in the moisture level of the soil on the ecoroof. Four moisture sensors were set in different quadrants in four experimental testbeds, and the moisture level data was recorded from October 18th, 2018 to September 10th, 2019. The study found that in with heavy rainfall, the front of the …
Application Of Modified River Health Index For Sungai Penchala,
2020
Universiti Malaya
Application Of Modified River Health Index For Sungai Penchala, Sathis Venkitasamy
Student Works (2020-2029)
The aim of this study is to have a tool of management of an urban river. A simple tool in terms of index aimed to be developed to manage urban river to meet its intended usage. River Health Index (RHI) developed by combining both physico-chemical parameters and biological measures through scores and weightages. Sungai Penchala is the small urban river chosen for this study. Water quality study, which include physico-chemical parameters, benthic macroinvertebrates and surrounding land use activities have been carried out since May 2016 to September 2016. Ten sampling points have been selected to represent the condition of the …
Isotherm And Kinetics Study For The Adsorption Of Nitrate From An Aqueous Solution Using A Modified Rice Straw,
2020
The British University in Egypt
Isotherm And Kinetics Study For The Adsorption Of Nitrate From An Aqueous Solution Using A Modified Rice Straw, Dalia A. Ali Eng, Mohamed A. Sadek Prof., Nagwa Mahmoud Al-Mansi Prof, Ahmad Wafiq Aboelnasr Dr.
Chemical Engineering
In this research, modified rice straw (MRS) is proposed. The proposed production process of the modified rice straw (MRS) adsorbent is carried out by precipitation of iron nano particles on the surface of acid activated rice straw. The nitrate adsorption is carried out through batch experiments. The optimum nitrate removal 94.8 % was achieved at pH = 7, adsorbent dose 3 = g/L, 150 rpm, initial nitrate concentration = 23 mg/L and contact time 180 = min. The new adsorbent synthesis, kinetics and isotherm models were studied. The nitrate adsorption was well described by pseudo second order kinetic model (R2 …
Permeable Road Pavement With Subsurface Precast Micro-Detention Storage: A Green Pavement Practice,
2020
Universiti Malaya
Permeable Road Pavement With Subsurface Precast Micro-Detention Storage: A Green Pavement Practice, Norazlina Bateni
Student Works (2020-2029)
Green infrastructure practices are uniquely applicable to address the relationship between land use and water resources through the replication of the natural hydrological process within the landscape. Implementation of such practices, especially green pavement can significantly improve the rainfall-runoff responses, and thereby minimise the occurrence of flood hazards, which may lead to uncountable economic losses. Common permeable pavements are typically composed of fine-layered particles attributed to low porosity. In this study, an innovative permeable pavement with a micro-detention pond storage (PPDS) system is proposed. It is a modified type of interlocking block permeable pavement consisting of a hollow cylinder with …
Dairy Manure Flushwater Treatment By Algae Raceway Ponds And Aerated Biofilm Reactors,
2020
California Polytechnic State University, San Luis Obispo
Dairy Manure Flushwater Treatment By Algae Raceway Ponds And Aerated Biofilm Reactors, Darin Son
Master's Theses
Nitrogen removal technologies can help dairy industries meet their nutrient management needs. This thesis investigated two separate treatment technologies for total ammonia nitrogen (TAN) removal: algae raceway ponds and aerated biofilm reactors. Six 1000- liter algae raceway ponds and four 1000-liter tote tanks, each equipped with 10 sheets of nonwoven geotextile (i.e., thermally bonded or needle-punched) biofilm substrate, were used to treat the effluent from a flush dairy in central coastal California (TAN = 251 mg/L, cBOD5 = 204 mg/L). For the algae raceway ponds (TAN loading rate = 7 - 35 g/m³-day among 7-, 10- and 14-day hydraulic residence …
