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

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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

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Effect of pressure on the electrical properties of flexible NiPc thin films fabricated by rubbing-in technology

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Chinese Physics B 2021年第1期30卷 328-331页

作者： khasan s karimov Fahmi F Muhammadsharif Zubair Ahmad M Muqeet Rehman Rashid Ali GIK Institute of Engineering sciences and Technology TopiDistrict SwabiKPK23640Pakistan Center for Innovative Development of science and New Technologies of Academy of sciences of Tajikistan Dushanbe734025 Department of Physics Faculty of Science and HealthKoya University44023 KoyaKurdistan Region-F.R.Iraq Center for Advanced Materials(CAM) Qatar UniversityP.O.Box 2713DohaQatar Department of Electronic Engineering Jeju National UniversityJejuRepublic of Korea

Nickel phthalocyanine(Ni Pc) film was deposited onto the surface of flexible conductive glass by rubbing-in technology and used to fabricate devices based on ITO/Ni Pc/CNT/rubber structure. The I–V characteristics of the devices were investigated under different uniaxial pressures of 200, 280, and 480 gf/cm^(2), applied perpendicular to the surface of the Ni Pc film. Results showed that the nonlinearity coefficients of the I–V curves are in the range of 2 to 3, which was found to be decreased with the increase of the pressure. The rectification ratio of the devices was estimated to be varied from 1.5 to 3 based on the applied pressure. Concluding, the resistance of the active layers was decreased with the increase of both pressure and voltage. We believe that using the rubbing-in technology under sufficient applied pressure it is possible to utilize Ni Pc for the development of various electronic devices such as diodes, nonlinear resistors, and sensors.

关键词： pressure electrical property NiPc thin film rubbing-in technology

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

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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

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Characterization of vanadyl phthalocyanine based surface-type capacitive humidity sensors

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Journal of semiconductors 2010年第11期31卷 9-14页

作者： Fakhra Aziz M.H.sayyad khassan s.karimov M.saleem Zubair Ahmad s.Mahmood khan Ghulam Ishaq khan Institute of Engineering sciences and Technology Topi-23640Pakistan Low Dimensional Material Research Center Department of PhysicsUniversity of Malaya50603 Kuala LumpurMalaysia Physical Technical Institute Aini St-299/1Dushanbe734063Tajikistan Department of Mechanical Engineering 20 Symonds Street AucklandUniversity of AucklandNew Zealand

This study presents the fabrication and characterization of novel surface-type capacitive humidity sensors using vanadyl phthalocyanine（VOPc） as the active *** devices,which comprise three different thicknesses, have been fabricated using the thermal evaporation technique.A thin film of VOPc is deposited on thoroughly cleaned glass substrates with pre-patterned Ag *** capacitive effect of the samples under humidity has been investigated. Comparison of the samples with different thicknesses shows that the thinnest device seems more sensitive towards *** humidity dependent capacitance properties of the sensor make it beneficial for use in commercial hygrometers.

关键词： surface-type capacitance vanadyl phthalocyanine humidity sensor organic semiconductor

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surface-type nonvolatile electric memory elements based on organic-on-organic CuPc-H_2Pc heterojunction

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Chinese Physics B 2015年第11期24卷 328-332页

作者： khasan s.karimov Zubair Ahmad Farid Touati M.Mahroof-Tahir M.Muqeet Rehman s.Zameer Abbas Ghulam Ishaq khan Institute of Engineering science and Technology Center for Innovative Development of science and New Technologies Department of Electrical Engineering College of Engineering Qatar University Department of Chemistry and Earth sciences Qatar University

A novel surface-type nonvolatile electric memory elements based on organic semiconductors CuPc and H2Pc are fabricated by vacuum deposition of the CuPc and H2Pc films on preliminary deposited metallic （Ag and Cu） electrodes. The gap between Ag and Cu electrodes is 3040μm. For the current-voltage （I-V） characteristics the memory effect, switching effect, and negative differential resistance regions are observed. The switching mechanism is attributed to the electric-field-induced charge transfer. As a result the device switches from a low to a high-conductivity state and then back to a low conductivity state if the opposite polarity voltage is applied. The ratio of resistance at the high resistance state to that at the low resistance state is equal to 120-150. Under the switching condition, the electric current increases -- 80-100 times. A comparison between the forward and reverse I-V characteristics shows the presence of rectifying behavior.

关键词： heterojunction nonvolatile memory organic-on-organic CuPc H2Pc

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The Transformation of the Heterogeneous Materials under the Fatigue Deformation

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Materials sciences and Applications 2012年第6期3卷 398-407页

作者： s. kh. shamirzaev J. K. Ziyovaddinov sh. B. karimov Physical Technical Institute of Uzbek Academy of sciences Tashkent Republic of Uzbekistan

The objects of our paper are aluminum alloy samples (AAss) contained the different amount of Cu, Mn, Mg, si and Li. We are modeling the features of microstructure of potential relief of an AAs and studying its transformation under both imposed fatigue deformation and wetted by liquid metals (Ga;or Hg;Li;In). We illustrate the main ideas by using only the “time series” allied with effective internal friction Q-1eff of an AAs. AAss like B-95 or 7075 are heterogeneous materials for which the more energy can be absorbed by selected micro-regions of a tested sample. so micro-crack in the space of AAs and alarm state of AAs arises. Each micro-region will to contribute the Q-1k (the internal friction Q-1k belong to k-th micro-region) to the effective internal friction— Q-1eff accordance with fit statistic . We find a number of micro-regions—L and series gk & Qk from the experimental data like as the internal friction (Q-1)eff versus both the number of cycles—N and the deformation—е. series gk & Qk (k=1,2,3,...,L) present the microstructures of AAss. In this paper also is presented the original technology to forecast fatigue damage of an AAs. Here the fatigue sensitive element (FsE) used. We made multiphase heterogeneous mixtures (MHMs) which contents a variable volume of initial components. It is selected MHMs are using for produce FsEs. The present paper is aimed to establish the correlation of the FsEs microstructures changes and corresponding changes of the aluminum alloy microstructures at imposing the same spectra deformation on both of them. A change of FsEs microstructure investigated by using their effective electrical resistance Reff data.

关键词： Amplitude-Dependent Internal Friction Fatigue Cracking Process Alarm state Fatigue sensitive Element

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Development of Magnesium-Dominant soils Under Irrigated Agriculture in southern Kazakhstan

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Pedosphere 2009年第3期19卷 331-343页

作者： A. karimov M. QADIR A. NOBLE F. VYsHPOLsKY K. ANZELM International Water Management Institute (IWMI) Central Asia Regional Office Tashkent 700000 (Uzbekistan) International Center for Agricultural Research in the Dry Areas (ICARDA) Aleppo 5466 (Syria) International Water Management Institute (IWMI) Colombo 2075 (Sri Lanka) International Water Management Institute (IWMI) c/o WorldFish Center Penang 11960 (Malaysia) Water Conservation Laboratory The Kazakh Research Institute of Water Management Ministry of Agriculture Taraz480022 (Kazakhstan) southern Kazakhstan Hydrogeology and Land Reclamation Expedition Shymkent (Kazakhstan)

Irrational irrigation practices in the Arys Turkestan Canal command area in the southern part of Kazakhstan have led to the formation of soils with poor physical and chemical properties. To study whether irrigation and leaching practices and/or groundwater rise have contributed to the accumulation of Mg2+ on the cation exchange complex of these soils, historical changes in soil and groundwater quality were used as source data and the Visual MINTEQ model was applied to analyze the chemical composition of water and soils in the study area. The imposed irrigation regime and the leaching of light sierosem soils led to the dissolution and subsequent leaching of inherent gypsum and organic matter from the soil profile. Further, the domination of bicarbonate in the irrigation water promoted weathering of the carbonate minerals present as calcite. The higher concentrations of Mg2+ in comparison to Ca2+ in the irrigation water resulted in the replacement of Na+ by Mg2+ on the cation exchange complex. In the lower part of the command area, shallow groundwater has contributed to the accumulation of Na+ and to a large extent of Mg2+ on the cation exchange sites.

关键词： exchangeable magnesium high-magnesium soil and water Kazakhstan land degradation

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A Contested Muslim Identity in Kazakhstan： Between Liberal Islam and the Hanafi Project

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Cultural and Religious studies 2018年第5期6卷 300-312页

作者： Nodar karimov Oxford Centre for Islamic studies Astana Kazakhstan

The liberal pattern in Islam displayed itself at different points in the history of Kazakhstan through quasi state models of political organization, governance networks, multiethnic and multireligious societies, individual freedoms, and syncretic essence of Islam in the local culture. This paper examines the role of liberal pattern in the evolution of Islam in Kazakhstan based on historical and antropological analysis to call into question the state’s ongoing efforts to plant the authoritarian interpretation of Islam epitomized in the so-called Hanafi project. The notion of the Hanafi project is offered as the antithesis to classical Islamic Hanafi school, which is manipulated by the state to mask the imposition of the secular national policy in the religious domain.

关键词： Islam Muslim identity liberal pattern Hanafi project social contract governance networks multiculturalism

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Mathematical Modeling of Heat Flux Distribution in Raw Cotton stored in Bunt

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Engineering（科研） 2020年第8期12卷 591-599页

作者： karimov Abdusamat Ismonovich Ismanov Muhammadziyo Namangan Institute of Engineering and Technology Namangan Uzbekistan

The scientific article examines the physical and mechanical properties of raw cotton stored in buntings in cotton palaces. Because during the storage of raw cotton in bunts, some of its properties deteriorate, some improvements. Therefore, the mathematical modeling of storage conditions of raw cotton in bunts and the physical and mechanical conditions that occur in it is of great importance. In the developed mathematical model, the main factor influencing the physical and mechanical properties of raw cotton is the change in temperature. Due to the temperature, kinetic and biological processes accumulated in the raw cotton in Bunt, it can spread over a large surface, first in a small-local state, over time with a nonlinear law. As a result, small changes in temperature lead to a qualitative change in physical properties. In determining the law of temperature distribution in the raw cotton in Bunt, Laplace’s differential equation of heat transfer was used. The differential equation of heat transfer in Laplace’s law was replaced by a system of ordinary differential equations by approximation. Conditions are solved in MAPLE-17 program by numerical method. As a result, graphs of temperature changes over time in raw cotton were obtained. In addition, the table shows the changes in density, pressure and mass of cotton, the height of the bun. As the density of the cotton raw material increases from the top layer of the bunt to the bottom layer, an increase in the temperature in it has been observed. This leads to overheating of the bottom layer of cotton and is the main reason for the deterioration of the quality of raw materials.

关键词： Physical Mechanical Properties The Bunt Parallelepiped The Mathematical Model Biological system Heat Processes Temperature Coefficient Experiment The Bulk Density Volumetric Density Humidity Figure Coordinate Axes The Laplace Differential Equation Transfer solution Approximate MAPLE

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Investigation of the Nanostructures Formation in the Irradiated by γ-Quanta single-Crystal silicon with Ultrasonic Method

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Advances in Materials Physics and Chemistry 2012年第3期2卷 155-158页

作者： Turdali khaydarov Izida khamidovna Abdukadirova Yuriy karimov Institute of Nuclear Physics Academy of sciences Tashkent Uzbekistan

It’s determined that a phasic dynamics of deformation strengthening of single-crystal silicon irradiated by γ-quanta (with energy ~1.27 MeV) in the range of radiation absorbed doses from 102 up to 109 rad by the internal friction measurement with widely known ultrasonic resonance method. We have detected appearance the maximum on the dependence of internal friction (Q-1) from dose at 5 × 105 rad in the specimens of p - si with a density of the dislocations more than 103 cm-2. The instability of the dislocation structures has been established in the range of doses from 106 up to 109 rad, due to the formation and accumulation in the crystal lattice of the point like and the continuous radiation defects. On the time dependence of Q-1(t) per 1.5 - 2 hours after irradiation, the maximum has been established which position depends on dose of radiation. The monotonic decrease of Q-1(t) dependence was observed at the increase of the observation time after stopping of the specimen irradiation, which is connected with decreasing of the radiation defects densities as the result of their annihilation.

关键词： Internal Friction Density of Dislocations si Radiation Defects Annihilation

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