Modeling and Research of Gas Transportation Unit Operation Modes

2019 ◽  
Vol 13 (4) ◽  
pp. 224
Author(s):  
Nurlan Batayev ◽  
Talgat Shuvatov ◽  
Aidar Kuzyrgaliyev ◽  
Rustam Krikbayev
Keyword(s):  
Unit Operation ◽  
Operation Modes ◽  
Transportation Unit

scholarly journals ADAPTATION OF THE GIVEN CHARACTERISTICS OF NATURAL GAS BLOWERS TO THE TECHNICAL STATE OF MACHINES

2018 ◽  
pp. 100-105
Author(s):  
S. I. Perevoschikov
Keyword(s):  
Natural Gas ◽  
Automatic Control ◽  
Technical State ◽  
Unit Operation ◽  
Operation Modes ◽  
Pumping Unit ◽  
Gas Pumping ◽  
Gas Pumping Unit ◽  
Pumping Units ◽  
The Given

The article deals with the technique of transferring of blower’s characteristics from the graphic type to the analytical. This representation of the characteristics allows correct them automatically by the results of parametric diagnostics of blowers and use them for automatic control of the gas-pumping unit operation modes. Usage of these characteristics furnishes the gas-pumping units with the properties of self-regulating systems.

Whole body 3T MRI system with eight parallel RF transmit/receive channels and dual operation modes

2007 ◽  
Vol 179 (03) ◽  
Author(s):  
I Graesslin ◽  
P Vernickel ◽  
J Schmidt ◽  
C Findeklee ◽  
P Röschmann ◽  
...  
Keyword(s):  
Whole Body ◽  
3T Mri ◽  
Operation Modes

THE ANALYSIS OF OPERATION MODES OF ENERGY STORES IN AUTONOMOUS HYBRID POWER PLANTS WITH RENEWABLE ENERGY RESOURCES

2018 ◽  
pp. 55-67
Author(s):  
S. G. Obukhov ◽  
I. A. Plotnikov ◽  
V. G. Masolov
Keyword(s):  
Renewable Energy ◽  
Power Systems ◽  
Low Frequency ◽  
Rechargeable Batteries ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Hybrid Power ◽  
Operation Modes ◽  
Energy Stores ◽  
Energy Store

The paper presents the results of the comparative analysis of operation modes of an autonomous hybrid power complex with/without the energy store. We offere the technique which defines the power characteristics of the main components of a hybrid power complex: the consumers of the electric power, wind power and photo-electric installations (the last ones have been constructed). The paper establishes that, in order to compensate the seasonal fluctuations of power in autonomous power systems with renewable energy resources, the accumulative devices are required, with a capacity of tens of MWh including devices that are capable to provide energy storage with duration about half a year. This allows abandoning the storage devices for smoothing the seasonal fluctuations in the energy balance.The analysis of operation modes of energy stores has shown that for a stock and delivery of energy on time intervals, lasting several hours, the accumulative devices with rather high values of charging and digit power aren't required. It allows using the lead-acid rechargeable batteries of the deep category for smoothing the daily peaks of surplus and a capacity shortage. Moreover, the analysis of operation modes of energy stores as a part of the hybrid complexes has demonstrated that in charging/digit currents of the energy store the low-frequency and high-frequency pulsations of big amplitude caused by changes of size of output power of the renewable power installations and loading are inevitable. If low-frequency pulsations (the period of tens of minutes) can partially be damped due to the restriction of size of the maximum charging current of rechargeable batteries, then it is essentially impossible to eliminate high-frequency pulsations (the period of tens of seconds) in the power systems with the only store of energy. The paper finds out that the combined energy store having characteristics of the accumulator in the modes of receiving and delivery of power on daily time intervals, and at the same time having properties of the supercondenser in the modes of reception and return of impulses of power on second intervals of time is best suited to requirements of the autonomous power complexes with renewable energy resources.

Polycaprolactone based membranes for the degradation of diclofenac present in water samples using ZnO nanoparticles as the active agent

MRS Advances ◽  
2020 ◽  
Vol 5 (61) ◽  
pp. 3153-3161
Author(s):  
Marco Antonio Juárez Sánchez ◽  
Miguel Ángel Meléndez Lira ◽  
Celestino Odín Rodríguez Nava
Keyword(s):  
Zno Nanoparticles ◽  
Wastewater Treatment Plants ◽  
Active Agent ◽  
Heterogeneous Photocatalysis ◽  
Nano Particles ◽  
Electrical Characteristics ◽  
Unit Operation ◽  
Fields Of Study ◽  
Drug Contamination ◽  
Positive Results

AbstractDrug contamination in water is one of the current fields of study. Since 1990, the presence of drugs in drinking water has been a concern to scientists and public. In Mexico, these organic compounds are not efficiently removed in wastewater treatment plants; therefore, alternative methodologies have been studied that allow these compounds to have a high percentage of degradation or be completely degraded. One example of these techniques is heterogeneous photocatalysis which has obtained positive results in the degradation of drugs using ZnO nanoparticles. These are commonly selected for their electrical characteristics, even though they disperse in water and an additional unit operation is required to separate them from the liquid medium. To eliminate drugs with nano particles in a single stage, polycaprolactone-based membranes with adhered ZnO nanoparticles, by means of electrospinning, were prepared to degrade drugs such as diclofenac. The technique used has shown to efficiently break down diclofenac in 4 hours according to the capillary electrophoresis readings.

ENERGY SAVING OPERATION MODES OF TRANSCEIVERS IN ULTRA-WIDEBAND SENSOR NETWORKS

2012 ◽  
Vol 1 (1) ◽  
Author(s):  
Yu. V. Andreev ◽  
E. V. Efremova ◽  
V. A. Lazarev ◽  
V. A. Kotelnikov
Keyword(s):  
Sensor Networks ◽  
Energy Saving ◽  
Ultra Wideband ◽  
Operation Modes

ПРОЕКТИРОВАНИЕ ВЫСОКОТОЧНЫХ СВЧ КВАДРАТУРНЫХ МОДУЛЯТОРОВ И ДЕМОДУЛЯТОРОВ И ИССЛЕДОВАНИЕ ВОЗМОЖНОСТИ ПОДСТРОЙКИ ДИНАМИЧЕСКИХ ПАРАМЕТРОВ С ПОМОЩЬЮ ЦИФРОВОЙ РЕГУЛИРОВКИ

2020 ◽  
Vol 96 (3s) ◽  
pp. 337-342
Author(s):  
И.И. Мухин ◽  
Р.С. Шабардин ◽  
Л.В. Недашковский ◽  
Д.Н. Морозов
Keyword(s):  
Dynamic Parameters ◽  
Operation Modes ◽  
Measurement Results ◽  
Quadrature Modulators ◽  
Functional Blocks

В работе представлены результаты проектирования четырех микросхем квадратурных модуляторов и демодуляторов, в которых реализована коррекция динамических параметров цифровым способом, что достигается регулировкой режимов работы отдельных функциональных блоков схемы. Разработаны опытные образцы квадратурных модуляторов и демодуляторов на основе SiGe технологического процесса и приведены результаты измерений. Показано, что при регулировке изменение фазового разбаланса может достигать значений до 5°, амплитудный разбаланс - до 2,8 дБ, а подавление паразитных составляющих может быть больше 50 дБ. The paper presents four quadrature modulators and demodulators circuits design results. In these circuits the dynamic parameters are digitally corrected, which is achieved by adjusting the operation modes of separate functional blocks. Prototypes of quadrature modulators and demodulators manufactured on SiGe process were produced and the measurement results are presented. It is shown that during adjustment the change in phase imbalance can reach values up to 5 degrees, amplitude imbalance up to 2.8 dB, and suppression of spurious components can be more than 50 dB.

Bioseparations Science and Engineering

2015 ◽  
Author(s):  
Roger G. Harrison ◽  
Paul W. Todd ◽  
Scott R. Rudge ◽  
Demetri P. Petrides
Keyword(s):  
Process Design ◽  
Qualitative Description ◽  
Engineering Practice ◽  
Unit Operation ◽  
Science And Engineering ◽  
Scientific Application ◽  
General Application ◽  
Unit Operations ◽  
Analysis Computer ◽  
Consistent Method

Designed for undergraduates, graduate students, and industry practitioners, Bioseparations Science and Engineering fills a critical need in the field of bioseparations. Current, comprehensive, and concise, it covers bioseparations unit operations in unprecedented depth. In each of the chapters, the authors use a consistent method of explaining unit operations, starting with a qualitative description noting the significance and general application of the unit operation. They then illustrate the scientific application of the operation, develop the required mathematical theory, and finally, describe the applications of the theory in engineering practice, with an emphasis on design and scaleup. Unique to this text is a chapter dedicated to bioseparations process design and economics, in which a process simular, SuperPro Designer® is used to analyze and evaluate the production of three important biological products. New to this second edition are updated discussions of moment analysis, computer simulation, membrane chromatography, and evaporation, among others, as well as revised problem sets. Unique features include basic information about bioproducts and engineering analysis and a chapter with bioseparations laboratory exercises. Bioseparations Science and Engineering is ideal for students and professionals working in or studying bioseparations, and is the premier text in the field.

scholarly journals The simulation model for a flood management by flood control facilities

2018 ◽  
Vol 245 ◽  
pp. 15002 ◽  
Author(s):  
Roman Davydov ◽  
Valery Antonov ◽  
Dmitry Molodtsov ◽  
Alexey Cheremisin ◽  
Vadim Korablev
Keyword(s):  
Mathematical Models ◽  
Flood Control ◽  
Flood Management ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Operating Characteristics ◽  
Hydro Power ◽  
Operation Modes ◽  
Wide Range ◽  
Environmental Requirements

The rapid spread of storm floods over large areas requires flood management throughout the river basin by the creation an innovative system of flood control facilities of various functional purposes distributed in the area. The central part of the system is the hydro system with hydro power plant. In addition, the flood control facilities on the side tributaries with self-regulating reservoir are included in the system. To assess the effect of controlling extreme water discharges by flood control facilities, it is necessary to develop special mathematical models reflecting the specifics of their operation. Unified mathematical models of the operation modes of a hydro complex with hydroelectric power station and flood control facility are created. They are implemented in a computer program that provides the ability to determine the main parameters and operating characteristics of hydro systems when performing multivariate calculations in a wide range of initial data. This makes possible specifying the parameters and operation modes of each hydro system with the current economic and environmental requirements, to assess the energy-economic and environmental consequences in the operation of the system of flood control facilities distributed in the area. The article analyses the results of the extreme water discharge’s regulation by the hydro system on the main river and flood control facilities on the side tributaries, considering environmental requirements.

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