检索结果-南通市图书馆

聚丙烯酰胺对高黏油-水环状流流动特性的影响

在线全文

学校读者我要写书评

暂无评论

化工进展 2024年第3期43卷 1157-1166页

作者：尹晓云李静林冬胡金燕张良敬加强 karimov rinat M 孙杰中国石油西南油气田分公司安全环保与技术监督研究院四川成都610041 页岩气评价与开采四川省重点实验室四川成都610041 西南石油大学石油与天然气工程学院四川成都610500 油气消防四川省重点实验室四川成都611731 Department of Transport and Storage of Oil and Gas Ufa State Petroleum Technological UniversityRussia Ufa 450062

针对稠油水环输送的水环流动改进问题,提出稠油流动边界层在聚丙烯酰胺(PAM)水环作用下的模拟实验方法,基于自主研发设计的室内油-水两相流可视化环道实验装置,采用500#白油模拟旅大稠油,实验研究了稠油-水环状流外环水相中添加PAM前后... 详细信息

针对稠油水环输送的水环流动改进问题,提出稠油流动边界层在聚丙烯酰胺(PAM)水环作用下的模拟实验方法,基于自主研发设计的室内油-水两相流可视化环道实验装置,采用500#白油模拟旅大稠油,实验研究了稠油-水环状流外环水相中添加PAM前后的流型特征与阻力特性,评价了PAM对水环润滑的协同减阻效果,分析了PAM对水环流动稳定性的作用机理。实验结果表明:PAM对稠油-水环状流的流型特征与阻力特性均有显著影响,使环状流的分布区域缩小,其缩减区域转变为分层流和塞状流,当其为分层流时减阻作用丧失;当油相表观流速为0.23~0.90m/s时,PAM减阻率随含水率增加先迅速增大后缓慢减小,在测试范围内最高达35%。研究结果可为稠油水环输送工艺优化提供理论指导和技术支持,也可为稠油管输流动改进提供新理念与新方法。

关键词：聚丙烯酰胺油水环状流流型转变压力梯度减阻率

Flexible impedance and capacitive tensile load sensor based on CNT composite

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2016年第2期25卷 568-572页

作者： Zubair Ahmad Kh S karimov Farid Touati Department of Electrical Engineering College of Engineering Qatar University Doha 2713 Qatar Ghulam Ishaq Khan Institute of Engineering Sciences and Technology Topi District Swabi KPK 23640 Pakistan Center for Innovative Development of Science and New Technologies Academy of Sciences Aini St. 299/2 Dushanbe 734063 Tajikistan

In this paper, the fabrication and investigation of flexible impedance and capacitive tensile load sensors based on carbon nanotube（CNT） composite are reported. On thin rubber substrates, CNTs are deposited from suspension in water and pressed at elevated temperature. It is found that the fabricated load cells are highly sensitive to the applied mechanical force with good repeatability. The increase in impedance of the cells is observed to be 2.0 times while the decrease in the capacitance is found to be 2.1 times as applied force increases up to 0.3 N. The average impedance and capacitive sensitivity of the cell are equal to 3.4 N^（-1） and 1.8 N^（-1）, respectively. Experimental results are compared with the simulated values,and they show that they are in reasonable agreement with each other.

关键词： carbon nanotubes flexible tensile load impedance capacitive

Challenges for the sustainable use of water and land resources under a changing climate and increasing salinization in the Jizzakh irrigation zone of Uzbekistan

在线全文

学校读者我要写书评

暂无评论

Journal of Arid Land 2020年第1期12卷 90-103页

作者： rashid KULMATOV Jasur MIrZAEV Jilili ABUDUWAILI Bakhtiyor karimov State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China National University of Uzbekistan Tashkent 100170Uzbekistan CAS research Center for Ecology and Environment of Central Asia Urumqi 830011China University of Chinese Academy of Sciences Beijing 100049China Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Tashkent 100000Uzbekistan

Jizzakh Province in Uzbekistan is one of the largest irrigated areas in Central Asia without natural *** combination with aridity,climate change and extensive irrigation practices,this has led to the widespread salinization of agricultural *** aim of this study was to identify opportunities to improve the reclamation status of the irrigated area and how best to effectively use the water resources in Jizzakh Province based on investigations conducted between 1995 and 2016.A database of field measurements of groundwater levels,mineralization and soil salinity conducted by the provincial Hydro-Geological reclamation Expeditions was used in the *** total groundwater mineralization was determined using a portable electric conductometer(Progress 1T)and the chloride concentration was determined using the Mohr *** soil salinity analyses were conducted by applying two different methods:(1)the extraction and assessment of the soluble salt content,and(2)using an SM-138 conductivity sensor applied to a 1:1 mixture of soil sample and *** analyses of the monitoring results and the salt balance in the"irrigation water–soil–drainage water"system clearly demonstrated that the condition of the irrigated land in the province was not significantly *** these conditions,the stability of crop yields is achieved mainly through the use of large volumes of ***,excess amounts of mineral fertilizers can also cause the salinization of *** average groundwater salinization value in most of the irrigated land(75.3%)fluctuated between 1.1 and 5.0 g/L,while the values were less than 1.0 g/L in 13.1%of the land and in the range of 5.1–10.0 g/L in 10.5%of the *** the period of 1995–2016 the salinization level of the irrigated land in Jizzakh Province increased slightly and the area could be divided into the following classes:no salinity(17.7%of the total area),low salinity(51.3%),moderate salinity(29.0%),and high salinity(2.0%).De

关键词： irrigation groundwater level salinity soil salinization salt balance Uzbekistan

CuPc/C_(60) heterojunction thin film optoelectronic devices

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2010年第6期31卷 47-49页

作者： Imran Murtaza Ibrahim Qazi Khasan S.karimov GIK Institute of Engineering Sciences and Technology Physical Technical Institute of Academy of Sciences rudaki Ave.33 Dushanbe Pakistan Physical Technical Institute of Academy of Sciences Rudaki Ave.33Dushanbe

The optoelectronic properties of heterojunction thin film devices with ITO/CuPc/C_（60）/Al structure have been investigated by analyzing their current-voltage characteristics,optical absorption and *** this organic photovoltaic device,CuPc acts as an optically active layer,C_（60） as an electron-transporting layer and ITO and Al as *** is observed that,under illumination,excitons are formed,which subsequently drift towards the interface with C_（60）,where an internal electric field is *** excitons that reach the interface are subsequently dissociated into free charge carriers due to the electric field present at the *** experimental results show that in this device the total current density is a function of injected carriers at the electrode-organic semiconductor surface,the leakage current through the organic layer and collected photogenerated current that results from the effective dissociation of excitons.

关键词： organic semiconductor optoelectronic device thin film heterojunction CuPc C_(60)

Impedance hygrometer based on cellulose and CuPc

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2010年第6期31卷 70-73页

作者： Kh.S.karimov T.A.Qasuria Zubair Ahmad Ghulam Ishaq Khan Institute of Engineering Sciences and Technology Physical Technical Institute Aini St.299/1Dushanbe

An investigation has been made on the properties of an impedance hygrometer fabricated using cellulose and copper phthalocyanine（Ag/cellulose/CuPc/Ag）.A 5wt%suspension of cellulose was prepared in water while the CuPc was dissolved in *** film was deposited on glass substrates with preliminary deposited metallic electrodes followed by deposition of CuPc *** resistances and capacitances of the samples were evaluated under the effect of *** impedance was calculated from resistance and capacitance *** was also measured during the *** was observed that the capacitance of the sensor increases and resistance and impedance decrease with an increase in the relative humidity *** was found that the impedance-humidity relationship showed more uniform changes in the interval of 31%—98%rH than the resistance-and capacitance-humidity relationships that showed visible changes in the humidity intervals of 31%-80%rH and 80%-98%rH *** humidity-dependent impedance of the sample makes it attractive for use in impedance *** impedance hygrometer may be used in instruments for the environmental monitoring of humidity.

关键词： cellulose copper phthalocyanine organic hygrometer humidity impedance

CuPc based organic-inorganic hetero-junction with Au electrodes

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2010年第7期31卷 22-25页

作者： Zubair Ahmad Muhammad H.Sayyad Kh.S.karimov Ghulam Ishaq Khan Institute of Engineering Sciences and Technology TopiNWFP23460Pakistan Department of Mechanical Engineering 20 Symond Street AucklandUniversity of AucklandNew Zealand

A hetero-junction of n-silicon（n-Si） and copper phthalocyanine（CuPc） has been *** current -voltage characteristics were investigated to explain the rectification and conduction *** effect of temperature and humidity on the electrical properties of n-Si/CuPc hetero-junction has also been *** characteristics of the junction have been observed to be temperature and humidity dependent,so it is suggested that this junction can be used as a temperature and humidity sensor.

关键词： inorganic-organic hetero-junction n-Si CuPc

Electrical characterization of the organic semiconductor Ag/CuPc/Au Schottky diode

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2011年第4期32卷 52-56页

作者： Mutabar Shah M.H.Sayyad Kh.S.karimov Ghulam Ishaq Khan Institute of Engineering Sciences and Technology physical Technical Institute of Academy of Sciences

This paper reports on the fabrication and investigation of a surface-type organic semiconductor copper phthalocyanine（CuPc） based diode.A thin film of CuPc of thickness 100 nm was thermally sublimed onto a glass substrate with preliminary deposited metallic electrodes to form a surface-type Ag/CuPc/Au Schottky *** current-voltage characteristics were measured at room temperature under dark *** barrier height was calculated as 1.05 *** values of mobility and conductivity was found to be 1.74×10;cm;/（V·s） and 5.5×10;Ω;·cm;,*** low voltages the device showed ohmic conduction and the space charge limited current conduction mechanisms were dominated at higher voltages.

关键词： Schottky diode copper phthalocyanine thin film organic semiconductor mobility

Investigation of Motivation System of Civil Servants in Kyrgyz republic

在线全文

学校读者我要写书评

暂无评论

Investigation of Motivation System of Civil Servants in Kyrg...

作者： karimov Azamat 华南理工大学

学位级别：硕士

In order for an organization to function efficiently,it is necessary to properly use its *** resources are among the most efficient,but they need a special *** public administration,motivation is a much more complex and controversial *** is due to the specifics of the work of civil servants,so their initial goals are different from those working in commercial *** servants are,above all,people who govern *** services cannot be waived,since you can refuse the services of any commercial *** research paper studies the main theoretical approaches to the definition of the concept of motivation;Analyzed the foreign experience of stimulating public civil servants;The existing system of motivation of civil servants in the Kyrgyz republic has been studied.A questionnaire was compiled and a survey of government employees（100 people）was conducted,and an in-depth interview was conducted with three government *** and obtained survey *** on the results and analysis,I developed the following recommendations:That is,it is necessary to review the remuneration system of civil servants and raise it to a level comparable to the level in private companies / international organizations,and then develop and implement a system of differentiated salaries for civil servants（depending on size,complexity and quality）.and the importance of the work done).In order to attract and retain young people in the public service,it is necessary to develop and introduce a system of additional *** the coexisting system of benefits in government does not meet the needs of a public *** and optimize the entire public administration system in the country,analyze and optimize the existing functions assigned to each position,each department and each state *** work to reduce the personnel ballast in government bodies on the basis of its *** quantitative and qualitative criteria for

关键词：吉尔吉斯共和国公务员激励制度

Optical sensors based on the NiPc-CoPc composite films deposited by drop casting and under the action of centrifugal force

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第6期26卷 114-118页

作者： Noshin Fatima Muhammad M Ahmed Khasan S karimov Zubair Ahmad Fahmi Fariq Muhammad Department of Electrical Engineering Capital University of Science and Technology (CUST) Islamabad 44000 Pakistan GIK Institute of Engineering Sciences and Technology Topi District Swabi KPK 23640 Pakistan Center for Innovative Development of Science and New Technologies of Academy of Sciences Aini 299/2 Dushanbe 734063 Tajikistan Center for Advanced Materials (CAM) Qatar University P. O. Box 2713 Doha Qatar Center for Composites Institute for Vehicle Systems & Engineering Faculty of Mechanical Engineering Universiti Teknologi Malaysia 81310 Johor Bahru Johor Malaysia Soft Materials & Devices Laboratory Department of Physics Faculty of Science and Health Koya University Danielle Mitten'and Boulevard Koya 45 Kurdistan Region Iraq

In this study, solution processed composite films of nickel phthalocyanine（NiPc） and cobalt phthalocyanine（CoPc）are deposited by drop casting and under centrifugal force. The films are deposited on surface-type inter-digitated silver electrodes on ceramic alumina substrates. The effects of illumination on the impedance and capacitance of the NiPc–CoPc composite samples are investigated. The samples deposited under centrifugal force show better conductivity than the samples deposited by drop casting technique. In terms of impedance and capacitance sensitivities the samples fabricated under centrifugal force are more sensitive than the drop casting samples. The values of impedance sensitivity（Sz）are equal to（-1.83） MΩ·cm^2/mW and（-5.365） MΩ·cm^2/mW for the samples fabricated using drop casting and under centrifugal force, respectively. Similarly, the values of capacitance sensitivity（Sc） are equal to 0.083 pF·cm^2/mW and 0.185 pF·cm～2/mW for the samples fabricated by drop casting and under centrifugal force. The films deposited using the different procedures could potentially be viable for different operational modes（i.e., conductive or capacitive） of the optical sensors. Both experimental and simulated results are discussed.

关键词： optical sensors capacitive mode impedance mode centrifugal deposition