检索结果-南通市图书馆

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

在线全文

学校读者我要写书评

暂无评论

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

Properties of Entropy and Entanglement of Two—Mode Nonlinear Coherent States

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2002年第6X期38卷 715-728页

作者： MahmoudAbdel-Aty TarekM.el-shahat 等 MathematicsDepartment FacultyofScienceSouthValleyUniversitySohagEgypt InstitutfurMathematikundihreDidaktik UniversitatFlensburgMuewikerStr.77D-29943FlensburgGermany MathematicsDep

In this communication, two-mode nonlinear coherent states are reviewed and special cases are *** from a three-level atom coupled to two modes of radiation with any form of nonlinearities of the two-modefields, we derive a Raman-coupled effective hamiltonian by a unitary transformation, evaluated perturbatively in couplingconstants. We use the quantum entropy to measure the degree of entanglement in the time development of an effectivetwo-level atom interacting with two-mode nonlinear-coherent states. The results show that the nonlinearity effect yieldsthe superstructure of atomic Rabi oscillations and the effect of the Stark shift changes the quasiperiod of the field entropyevolution and entanglement between the particle and the field. A possible experimental test of a new effect is proposed.

关键词：量子信息处理双模非线性相子态熵特性

Effects of penicillamine, hypotaurine, and epinephrine on motility, hyperactivity, acrosome reaction of fresh ram sperm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian pacific Journal of Reproduction 2017年第6期6卷 283-288页

作者： K.h.el-shahat M.I.Taysser M.R.Badr K.A.Zaki Department of Theriogenology Faculty of Veterinary MedicineCairo University Department of Animal Reproduction and Artificial Insemination Reproduction Research Institute Agriculture Research CenterEgypt el-Shieh Zaied Veterinary Clinic Egypt

Objective:To determine the effects of different concentrations of penicillamine, hypotaurine, and epinephrine (PhE) as well as incubation time on motility, hyperactivity and acrosome reaction (AR) of ram spermin ***: Freshly ejaculated spermatozoa from three ram were collected, pooled and subjected to swim up technique in modified sperm Tyrode's albumin lactate pyruvate medium supplemented with different concentrations of PhE (10, 20, 30, 40, 50, 75 and 100 mM/mL). Then best concentrations were compared and examined for motility, hyperactivity and ***: A high concentrations of PhE (30, 40, 50, 75 and 100mM/mL) showed a significant increase in motility when compared to control immediately after dilution and exist for the first and second hour of incubation period. however, when longer incubation time were used, a significant (Phieved. Similar finding was observed in hyperactivity. Stained semen samples showed a maximum percentage of incomplete AR after 1 h incubation corresponding to 50 and 75 mM/mL of PhE;however, spermatozoa treated with 75 mM/mL had a higher tendency to undergo complete AR after further incubation up to 4 h. A dose dependent relationship was detected where the maximum value of total AR was shown in spermatozoa treated with 75 mM/mL PhE for 4 h. Conclusions: To obtain better motility, hyperactivity and AR, treatment of ram spermatozoa with 75 mM/mL PhE for 4 h before being used in insemination was considered the best concentration of PhE to be used in the process ofin-vitro fertilization.

关键词： Ram sperm Capcitation hyperactivation Acrosome reaction PhE VF

Effect of Y^(3+), Gd^(3+) and La^(3+) dopant ions on structural, optical and electrical properties of o-mullite nanoparticles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2014年第1期32卷 37-42页

作者： M.M.S.Sanad M.M.Rashad E.A.Abdel-Aal M.F.el-shahat K.Powers Central Metallurgical R & D Institute Particle Engineering Research Center University of Florida Faculty of Science Ain Shams University

Dielectric ceramics of M（x）Al6（1-x）Si2O13 doped mullite were synthesized via co-precipitation technique. The X-ray diffrac-tion profiles revealed that these nanoparticles were crystallized well and the volume of mullite unit cell was increased as a function of the ionic radius of dopant ion. TEM images showed regular orthorhombic crystal morphology for the pure mullite sample. Meanwhile, the doped samples exhibited slightly distorted crystal morphology of larger particle sizes. DSC thermograms evinced that the exo-thermic peak temperature of mullite was shifted to the lower value with M3＋ion insertion. The photoluminescence spectra were stud-ied for mullite samples, and it was found that the intensity of the emission spectra was affected by the M3＋ion type. It was found that, Y3＋doped mullite achieved the minimum dielectric loss value of 0.01 in the radio wave frequency region （1 Mhz）. Meanwhile, Gd3＋doped mullite achieved the minimum dielectric loss value of 0.09 in the microwave frequency region （1 Ghz）.

关键词： rare earths doped mullite photoluminescence crystallization temperature dielectric ceramics

Recombinase polymerase amplification as a promising tool in hepatitis C virus diagnosis

在线全文

学校读者我要写书评

暂无评论

World Journal of hepatology 2014年第12期6卷 916-922页

作者： hosam Zaghloul Mahmoud el-shahat Department of Clinical Pathology Faculty of Medicine Mansoura University Mansoura Al Daqahliyah 35514-60 Egypt Zoology Department Faculty of Science Mansoura University Mansoura Al Daqahliyah 35514-60 Egypt

hepatitis C virus(hCV)infection represents a significant health problem and represents a heavy load on some countries like Egypt in which about 20%of the total population are *** infection is usually asymptomatic and result in chronic hepatitis that give rise to complications including cirrhosis and hepatocellular *** management of hCV infection should not only be focus on therapy,but also to screen carrier individuals in order to prevent *** the present,molecular detection and quantification of hCV genome by real time polymerase chain reaction(PCR)represent the gold standard in hCV diagnosis and plays a crucial role in the management of therapeutic ***,real time PCR is a complicated approach and of limited *** the other hand,isothermal DNA amplification techniques have been developed and offer molecular diagnosis of infectious dieses at *** this review we discuss recombinase polymerase amplification technique and illustrate its diagnostic value over both PCR and other isothermal amplification techniques.

关键词： hepatitis C virus Nucleic acid testing Polymerase chain reaction Point-of-care Recombinase polymerase amplification

以脉冲萃取柱利用三异辛胺从高浓度铀溶液中回收铀（英文）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

无机化学学报 2016年第8期32卷 1427-1433页

作者： Mohamed Fathi el-shahat hisham Mohamed Kamal Reda Abd el-Gawad Ghazalla Walid Mohamed Morsy Faculty of Science Inorganic Chemistry Department Ain Shams University Cairo Egypt Nuclear Materials A uthority Cairo Egypt

利用三异辛胺(TOA)纯化Gattar小型试验工厂的高浓度铀溶液(洗脱液的铀浓度7 g·L-1),研究了脉冲萃取柱的性能。利用实验室级脉冲萃取柱进行了实验室规模的溶剂萃取实验和后续实验。结果表明,在室温、p h=1和有机相与水相的比例(VO/VA)约... 详细信息

利用三异辛胺(TOA)纯化Gattar小型试验工厂的高浓度铀溶液(洗脱液的铀浓度7 g·L-1),研究了脉冲萃取柱的性能。利用实验室级脉冲萃取柱进行了实验室规模的溶剂萃取实验和后续实验。结果表明,在室温、p h=1和有机相与水相的比例(VO/VA)约为1.8∶1时,加入二(2-乙基己基)磷酸(D2EhPA)使其与TOA的比例(VD2EhPA/VTOA)为2∶3,可使萃取克服Cl-的抑制效应,提高效率。将结论用于考察试验工厂级萃取柱的流体力学和传质性能,结果表明用脉冲萃取柱萃取铀可以达到97%的萃取效率,具有可行性。

关键词：洗脱液氯溶剂萃取法脉冲萃取柱

Performance Investigation of Three Combined Airfoils Bladed Small Scale horizontal Axis wind Turbine by BEM and CFD Analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Power and Energy Engineering 2017年第5期5卷 14-27页

作者： Mehedi hasan Adel el-shahat Musfequr Rahman Department of electrical Engineering Georgia Southern University Statesboro GA USA Department of Mechanical Engineering Georgia Southern University Statesboro GA USA

The present work is based on the comparative study between “Blade-element- Momentum” (BEM) analysis and “Computational-Fluid-Dynamics” (CFD) analysis of small-scale horizontal axis wind turbine blade. In this study, the pitch is considered as fixed and rotor speed is variable. Firstly, the aerodynamic characteristics of three different specialized airfoils were analyzed to get optimum design parameters of wind turbine blade. Then BEM was performed with the application of the open source wind turbine design and performance computation software Q-Blade v0.6. After that, CFD simulation was done by Ansys CFX software. here, k-ω “Shear-Stress-Transport” (SST) model was conducted for three-dimensional visualization of turbine performance. however, the best coefficient of performance was observed at 6o angle of attack. At this angle of attack, in the case of BEM, the highest coefficient of performance was 0.47 whereby CFD analysis, it was 0.43. Both studies showed good performance prediction which was a positive step to accelerate the continuous revolution in wind energy sector.

关键词： Wind Turbine Small Scale Blade Design Coefficient of Performance BEM CFD

Sedimentology, Structure and Depositional Environments of the Subsurface Cretaceous, North Sinai, Egypt Using Well Logs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Geosciences 2020年第3期11卷 37-57页

作者： Fouad Shaaban Amani Bourselli Adam el-shahat Mostafa el-Belqasi Geology Department Faculty of Science Mansoura University Mansoura Egypt Science Department College of Basic Education PAAET Kuwait

A complete set of well logs was used to study the sedimentology, structural and depositional environments of the subsurface Cretaceous rocks of northern Sinai, as a promising hydrocarbon province in Egypt. The sedimentological interpretations of well logs show sedimentary sequence of the Early Cretaceous, represented by the Neocomian, Aptian and Albian, which is composed mainly of shales and marls with minor carbonate and sandstone intercalations. Based on the Th/K ratios, the argillaceous sediments are composed of illite, montmorillonite and micas with little amounts of glauconite and chlorite. The environmental interpretations revealed sedimentological environments vary from estuarine to lagoonal and backreef of the Barremian-Aptian rocks, and from continental to estuarine in the Aptian-Albian. By contrast, the Late Cretaceous rocks, represented by the Cenomanian, Turonian, Santonian and Maastrichtian, are mainly composed of carbonates with few shale and marl intercalations. This sequence was accumulated under lagoonal to neritic and bathyal environments. The structural interpretations of well logs show that the Cretaceous section attains a wide range of dip magnitudes and dispersed azimuths all over the study area, which is probably attributed to tectonic and sedimentological processes. The inherited structural complexities indicate possible rejuvenations along old fault planes and rotation of the faulted blocks.

关键词： North Sinai Cretaceous Sedimentology Structure Environment Well Logs

Entanglement of Moving and Non-Moving Two-Level Atoms

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Quantum Information Science 2017年第4期7卷 172-184页

作者： Mohamad Kh. Ismail Tarek M. el-shahat Mathematics Department Faculty of Science Al-Azhar University Cairo Egypt

In this paper we study the dynamics of the atomic inversion, von Neumann entropy and entropy squeezing for moving and non-moving two-level atoms interacting with a Perelomov coherent state. The final state of the system using specific initial conditions is obtained. The effects of Perelomov and detuning parameters are examined in the absence and presence of the atomic motion. Important phenomena such as the collapse and revival are shown to be very sensitive to the variation of the Perelomov parameter in the presence of detuning parameter. The results show that the Perelomov parameter is very useful in generating a high amount of entanglement due to variation of the detuning parameter.

关键词： Atomic Inversion Von Neumann Entropy Atomic Motion Entropy Squeezing