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Some studies of the interaction between two two-level atoms and SU(1,1) quantum systems

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Chinese Physics B 2018年第10期27卷 116-122页

作者： t M El-Shahat M kh Ismail Faculty of Science Al-Azhar University. Assiut 71524 Egypt

Herein, we present an approach to look for the best phenomenon to measure quantum correlation. the system of two isolated qubits each interacting with a single-mode cavity was theoretically created to study the quantum correlation. Some of the phenomena, such as the quantum discord and concurrence, were generated through such a system. the influences of initial state purity, qubit motion, and detuning parameters were discussed for the phenomena. these parameters for a specific value show that the behavior of phenomena are analogous. It is interesting to mention that some values of detuning undergo a sudden death of phenomena, and the quantum discord still captures the qubits quantum correlation. We predict that the quantum discord may be a better measure of quantum correlation than concurrence.

关键词： an isolated atom with a cavity SU (1,1) quantum discord concurrence

Application of metal oxides-based nanofluids in PV/t systems: a review

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Frontiers in Energy 2022年第3期16卷 397-428页

作者： Shahriar Ahmed kh.Nazmul Ahshan MdNur Alam Mondal Shorab Hossain Department of Mechanical Engineering Hajee Mohammad Danesh Science and Technology UniversityDinajpur5200Bangladesh Department of Engineering BGMEA University of Fashion and TechnologyDhaka1230Bangladesh

Having the wide application of metal oxides in energy technologies, in recent years, many researchers tried to increase the performance of the PV/t system by using metal oxide-based nanofluids (NFs) as coolants or optical filters or both at the same time. this paper summarizes recent research activities on various metal oxides (Al2O3, tiO2, SiO2, Fe3O4, CuO, ZnO, MgO)-based NFs performance in the PV/t system regarding different significant parameters, e.g., thermal conductivity, volume fraction, mass flowrate, electrical, thermal and overall efficiency, etc. By conducting a comparative study among the metal oxide-based NFs, Al2O3/SiO2-water NFs are mostly used to achieve maximum performance. the Al2O3-water NF has a prominent heat transfer feature with a maximum electrical efficiency of 17%, and a maximum temperature reduction of PV module of up to 36.9°C can be achieved by using the Al2O3-water NF as a coolant. Additionally, studies suggest that the PV cell’s efficiency of up to 30% can be enhanced by using a solar tracking system. Besides, tiO2-water NFs have been proved to have the highest thermal efficiency of 86% in the PV/t system, but tiO2 nanoparticles could be hazardous for human health. As a spectral filter, SiO2-water NF at a size of 5 nm and a volume fraction of 2% seems to be very favorable for PV/t systems. Studies show that the combined use of NFs as coolants and spectral filters in the PV/t system could provide a higher overall efficiency at a cheaper rate. Finally, the opportunities and challenges of using NFs in PV/t systems are also discussed.

关键词： metal oxide nanofluids(NFs) nanoparticles(NPs) optical filter PV/t systems solar energy

Impedance hygrometer based on cellulose and CuPc

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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

Evaluation of SiC-porcelain ceramics as the material for monolithic catalyst supports

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Journal of Advanced Ceramics 2014年第3期3卷 230-239页

作者： Oleg SMORYGO Alexander MARUKOVICH Vitali MIKUtSKI Vladislav sadykov Powder Metallurgy Institute 41Platonov Str.220005MinskBelarus Boreskov Institute of Catalysis 5Lavrentiev Ave.630090NovosibirskRussia

Mechanical and thermal properties of SiC-porcelain ceramics were studied in the wide SiC content range of 0-95%.Microstructure evolution,shrinkage at sintering,porosity,mechanical strength,elastic modulus,coefficient of thermal expansion(CtE)and thermal conductivity were studied depending on SiC *** optimal sintering temperature was 1200℃,and the maximum mechanical strength corresponded to SiC content of 90%.Parametric evaluation of the ceramic thermal shock resistance revealed its great potential for thermal cycling *** was demonstrated that the open-cell foam catalyst supports can be manufactured from SiC-porcelain ceramics by the polyurethane foam replication process.

关键词： SiC porcelain mechanical properties thermal properties foam

Short sequence motif dynamics in the SARS-CoV-2 genome suggest a role for cytosine deamination in CpG reduction

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Journal of Molecular Cell Biology 2021年第3期13卷 225-227页

作者： Mukhtar sadykov tobias Mourier Qingtian Guan Arnab Pain King Abdullah University of Science and technology(KAUSt) Pathogen Genomics LaboratoryBiological and Environmental Science and Engineering(BESE)Thuwal-Jeddah 23955-6900Saudi Arabia Research Center for Zoonosis Control Global Institution for Collaborative Research and Education(GI-CoRE)Hokkaido UniversityN20 W10 Kita-KuSapporo 001-0020Japan

Dear Editor,the apolipoprotein B editing complex(APOBEC)protein family members are host antiviral enzymes known for catalyzing cytosine to uracil(C>U)deamination in foreign single-stranded DNA(ssDNA)and RNA(ssRNA)(Blanc and Davidson,2010;Salter and Smith,2018).Enzymatic target motifs for most of the APOBEC enzymes have been experimentally identified,among which the most common ones are 5′-[t/U]C-3′and 5′-CC-3′for DNA/RNA substrates(Salter and Smith,2018;McDaniel et al.,2020).It was recently suggested that SARS-CoV-2 undergoes genome editing by host-dependent RNA-editing proteins such as APOBEC(Di Giorgio et al.,2020;Rice et al.,2020;Simmonds,2020;Schmidt et al.,2021).

关键词： al. APOB editing

Surface-type humidity sensor based on cellulose-PEPC for telemetry systems

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Journal of Semiconductors 2011年第1期32卷 103-107页

作者： kh.S.Karimov M.Saleem t.A.Qasuria M.Farooq GIK Institute of Engineering Sciences and technology physical technical Institute Aini St.299/1Dushanbe734063Tajikistan

Au/cellulose-PEPC/Au surface-type humidity sensors were fabricated by drop-casting cellulose and poly-N-epoxypropylcarbazole （PEPC） blend thin films. A blend of 2wt% of each cellulose and PEPC in benzol was used for the deposition of humidity sensing films. Blend films were deposited on glass substrates with preliminary deposited surface-type gold electrodes. Films of different thicknesses of cellulose and PEPC composite were deposited by drop-casting technique. A change in electrical resistance and capacitance of the fabricated devices was observed by increasing the relative humidity in the range of 0-95% RH. It was observed that the capacitances of the sensors increase, while their resistances decrease with increasing the relative humidity. the sensors were connected to op-amp square wave oscillators. It was observed that with increasing the relative humidity, the oscillator＇s frequencies were also increased in the range of 4.2-12.0 khz for 65μm thick film sample, 4.1-9.0 khz for 88μm thick film sample, and 4.2-9.0 khz for 210μm sample. Effects of film thickness on the oscillator＇s frequency with respect to humidity were also investigated. this polymer humidity sensor controlled oscillator can be used for short-range and long-range remote systems at environmental monitoring and assessment of the humidity level.

关键词： surface-type sensor: cellulose poly-N-epoxvoropylcarbazole humidity sensor controlled oscillator

tailoring properties of reticulated vitreous carbon foams with tunable density

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Frontiers of Materials Science 2016年第2期10卷 157-167页

作者： Oleg SMORYGO Alexander MARUKOVICH Vitali MIKUtSKI Vassilis StAtHOPOULOS Siarhei HRYHORYEU Vladislav sadykov Powder Metallurgy Institute National Academy of Sciences of Belarus 41 Platonov Str. Minsk 220005 Belarus technological Educational Institute of Sterea Ellada Psahna Evias 34400 Greece Belarusian National technical University 65 Nezavisimosty Ave. Minsk 220013 Belarus Boreskov Institute of Catalysis Sibrian Branch of Russian Academy of Sciences 5 Lavrentiev Ave. 630090 Novosibirsk Russia Novosibirsk State University 2 Pirogova Str. 630009 Novosibirsk Russia

Reticulated vitreous carbon （RVC） foams were manufactured by multiple replications of a polyurethane foam template structure using ethanolic solutions of phenolic resin. the aims were to create an algorithm of fine tuning the precursor foam density and ensure an open-cell reticulated porous structure in a wide density range. the precursor foams were pyrolyzed in inert atmospheres at 700℃, 1100℃and 2000℃, and RVC foams with fully open cells and tunable bulk densities within 0.09-0.42 g/cm3 were synthesized. the foams were characterized in terms of porous structure, carbon lattice parameters, mechanical properties, thermal conductivity, electric conductivity, and corrosive resistance. the reported manufacturing approach is suitable for designing the foam microstructure, including the strut design with a graded microstructure.

关键词： foam vitreous carbon reticulated cellular structure pyrolysis

transport mechanism in chemically reactive hybrid nanofluid flow containing gyrotactic micro-organisms over a curved oscillatory surface

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 177-192页

作者： M.NAVEED M.IMRAN t.ASGHAR Z.ABBAS Department of Mathematics Division of Science and TechnologyUniversity of Education Department of Mathematics The Islamia University of Bahawalpur

this paper examines the transport analysis, including both heat transfer and mass transfer, in hybrid nanofluid flow containing gyrotactic microorganisms towards a curved oscillatory surface. the influence of magnetic fields is also inspected in terms of their physical characteristics. to depict the phenomena of transport, modified versions of both Fick's and Fourier's laws are used. Additionally, the characteristics of both heterogeneous and homogeneous chemical reactions are also incorporated. Utilizing a curvilinear coordinate system, the flow problem is formulated as partial differential equations(PDEs)for momentum, concentration, microorganism field, and energy. An analytical solution to the obtained flow equations is achieved utilizing the homotopy analysis method(HAM).the effects of significant flow parameters on the pressure and microorganism fields, velocity, oscillation velocity, concentration, and temperature distributions are shown via graphs. Furthermore, the variations in skin friction, mass transfer rate, heat transfer rate, and local motile number due to different involved parameters are presented in tables and are analyzed in detail. Graphical results indicate that the curves of velocity and temperature fields are enhanced as the values of the solid volume fraction variables *** is also verified that the concentration rate field decreases as the values of the homogeneous reaction strength parameter and the radius of curvature parameter increase, and it increases with the Schmidt number and the heterogeneous reaction strength *** outcomes show a favorable response of the motile number to advanced values of the Peclet number, the Schmidt number, the microorganism difference parameter, and the bio-convective Lewis number.

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Effect of tritium reduction in determining energy gain by using R-matrix method direct laser fusion in D-t reaction

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Nuclear Science and techniques 2007年第3期18卷 129-136页

作者： S.N.HOSSEINI MOtLAGH Sh.S.MOHAMADY M.kh.MORADkhANI R.SHAMSI Department of Physics Iran University of Science and technology IranDepartment of PhysicsIran University of Science and Technology IranDepartment of PhysicsIran University of Science and Technology IranDepartment of Industrial EngineeringMazandaran University of Science and Technology Iran

the laser fusion criterion is known as the ρR-Criterion, also called high-gain condition. this parameter is temperature dependent and can be calculated by R-matrix method. this method is applied for determining improved fusion cross-section for the reactions t(d,n)4He, 3He(d,p)4He, D(d,p)t, D(d,n)3He. In this paper the time dependent reaction rate equations for fusion reaction t(d,n)4He are solved and by using the obtained results we computed the fu- sion power density, energy gain versus temperature and ρR-parameter. the obtained results show that a suitable com- bination may be a deuterium fraction fD=0.65 and ft=0.35 which would lead 30% reduction in the tritium content of the fuel mixture, and this choice would not change the energy gain value very much. Finally, the obtained energy gain for D-t reaction by using R-matrix is in good agreement with other theories.

关键词：氘氚反应激光聚合等离子体交叉断面