检索结果-南通市图书馆

Adaptive Gain Tuning Rule for Nonlinear Sliding-mode Speed Control of Encoderless Three-phase Permanent Magnet Assisted Synchronous Motor

在线全文

学校读者我要写书评

暂无评论

CES Transactions on Electrical Machines and Systems 2023年第3期7卷 301-310页

作者： Ghada A.Abdel aziz Rehan Ali Khan IEEE Power Electronics and Energy Conversion Department Electronics Research InstituteCairo 11843Egypt Department of Electrical Engineering University of Science&TechnologyBannuPakistan.

In this paper, an adaptive gain tuning rule is designed for the nonlinear sliding mode speed control(NSMSC) in order to enhance the dynamic performance and the robustness of the permanent magnet assisted synchronous reluctance motor(PMa-Syn RM) with considering the parameter uncertainties. A nonlinear sliding surface whose parameters are altering with time is designed at first. The proposed NSMSC can minimize the settling time without any overshoot via utilizing a low damping ratio at starting along with a high damping ratio as the output approaches the target set-point. In addition, it eliminates the problem of the singularity with the upper bound of an uncertain term that is hard to be measured practically as well as ensures a rapid convergence in finite time, through employing a simple adaptation law. Moreover, for enhancing the system efficiency throughout the constant torque region, the control system utilizes the maximum torque per ampere technique. The nonlinear sliding surface stability is assured via employing Lyapunov stability theory. Furthermore, a simple sliding mode estimator is employed for estimating the system uncertainties. The stability analysis and the experimental results indicate the effectiveness along with feasibility of the proposed speed estimation and the NSMSC approach for a 1.1-k W PMa-Syn RM under different speed references, electrical and mechanical parameters disparities, and load disturbance conditions.

关键词： Permanent magnet assisted synchronous reluctance motor Nonlinear sliding mode speed control Speed estimation Parameter uncertainties Sliding mode estimator

Peptides-based vaccine against SARS-nCoV-2 antigenic fragmented synthetic epitopes recognized by T cell and β-cell initiation of specific antibodies tofightthe infection

在线全文

学校读者我要写书评

暂无评论

Bio-Design and Manufacturing 2021年第3期4卷 490-505页

作者： Zainularifeen Abduljaleel Faisal A.Al-Allaf Syed A.aziz Department of Medical Genetics Faculty of MedicineUmm Al-Qura UniversityP.O.Box715Mecca21955Kingdom of Saudi Arabia Science and Technology Unit UmmAl-Qura UniversityP.O.Box 715Mecca21955Kingdom of SaudiArabia The Regional Laboratory Molecular Diagnostics UnitDepartment of Molecular BiologyMinistry of Health(MOH)P.O.Box 6251MeccaKingdom of SaudiArabia Department of Pathology and Lab Medicine University of Ottawa451Smyth RoadOttawaONK1H8M5Canada

The World Health Organization has declared the rapidly spreading coronavirus to be a global *** FDA is yet to approve a vaccine for human novel ***,we developed a peptide-based vaccine and used high-throughput screening by molecular dynamics simulation to identify T-cell-and p-cell-recognized epitopes for producing specific antibod-ies against *** construct~12 P'antigenic epitope peptides to develop a more effective vaccine and identify specific *** epitope peptides selectively presented the best antigen presentation scores for both human pMHC class I and II alleles to develop a strong binding *** antigens identified of SARS-nCoV-2 different proteins by each attached specific~1-7 L linker adaptor were used to construct a broad single peripheral peptide *** is expected to be highly antigenic with a minimum allergic *** a result of these exciting outcomes,expressing a vaccine using the intimated peptide was highly promising and positive to be highly proposed as epitope-based peptide vaccine of specific antibody against SARS-nCoV-2 by initiating T cells and β-*** in vitro study for the proposed peptide-based vaccine *** *** clinical trials are required to check the efficacy of this vaccine.

关键词： COVID-19 SARS-nCoV-2 Peptide-based vaccine Cell-penetrating peptides Lipid membrane Vaccine efficacy

Elemental characterization of black shales of Khyber Pakthunkhawa (KPK) region of Pakistan using AAS

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2013年第3期32卷 248-251页

作者： Abdul aziz Muhammad Sajjad Bashir Mohammad Central Analytical Facility Division Pakistan Institute of Nuclear Science and Technology Department of Construction Environment Engineering University of Science and Technology

Black shale samples were collected from Chimiari Khyber Pakthunkhawa region of Pakistan and were analyzed for elemental compositions. Atomic Absorption Spectrophotometry (AAS) was utilized for the determination of elements in the digested solutions. The analysis of black shale was performed precisely with relative standard deviation (RSD) lower than 2%. Results showed that the samples contained high concentrations of Ca (11.98 %), Al (7.09%), Fe (3.03%), Mg (0.59%) and Ti (0.58%).

关键词：原子吸收光谱法黑色页岩巴基斯坦元素组成表征相对标准偏差元素测定精确分析

Treatment of Hepatitis C Virus Infection in Children Less than 12 Years of Age in Developing Countries

在线全文

学校读者我要写书评

暂无评论

Journal of Clinical and Translational Hepatology 2014年第4期2卷 247-252页

作者： Sina aziz Abbasi Shaheed Hospital Karachi Medical and Dental College Karachi Pakistan

The treatment of hepatitis c virus (HCV) infection in children is difficult as few options are available. The standard therapy is combination pegylated interferon (PEG–IFN) α-2a or 2b and ribavirin, and the duration of therapy depends on HCV genotype. New oral drug therapies available for adults have stil not been approved for treatment in children. Here, we review the causes of HCV infection in children, the therapeutic options for children, and the side effects of these treatments. The problems faced by physicians managing HCV infection in children less than 12 years of age in a developing country are also discussed.

关键词： Hepatitis C Chronic Child Therapeutics Developing countries

Preparation and Antibacterial Activity of Superhydrophobic Modified ZnO/PVC Nanocomposite

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 Bionic Engineering 2022年第1期19卷 139-154页

作者： Muntadher Ismail Rahmah Raad Saadon Sabry Wisam Jafer aziz Medical Instrumentation Engineering Department Al-Esraa University CollegeBaghdad10001Iraq Physics Department College of ScienceMustansiriyah UniversityBaghdad10001Iraq

We fabricated a superhydrophobic modified ZnO/PVC nanocomposite cluster with antibacterial properties using the chemical precipitation method and selected solvent/non-solvent(THF/ethanol)to *** effects of ethanol content(47%,50%,53%,and 56%)on nanocomposite morphology and Water Contact Angles(WCAs)were *** measurements confirmed the polycrystalline structure of ZnO with a wurtzite hexagonal phase,and EDX results indicated the presence of all element *** analysis of specimens revealed a rough surface structure resembling a cluster of NPs,and that structure was dominant when the ethanol content increased to 56%.The WCA increased on the superhydrophobic nanocomposite as ethanol content increased,and an optimum WCA(160°±2°)was obtained at an ethanol content of 56%.Antibacterial activity was tested on the superhydrophobic and hydrophobic states,and the superhydrophobic specimens showed good inhibition against Klebsiella *** Staphylococcus ***,the hydrophobic specimens demonstrated no antibacterial activity against *** promising results can inform the development of nanocomposites for many environmental applications.

关键词： ZnO PVC Superhydrophobicity Antibacterial WCA

Antifungal activity of magnetically separable Fe3O4/ZnO/AgBr nanocomposites prepared by a facile microwave-assisted method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2016年第4期26卷 334-340页

作者： Abolghasem Hoseinzadeh aziz Habibi-Yangjeh Mahdi Davari Department of Chemistry Faculty of Science University of Mohaghegh Ardabili Department of Plant Protection Faculty of Agriculture University of Mohaghegh Ardabili

In the present work, magnetically separable Fe-3O4/ZnO/AgBr nanocomposites with different weight ratios of Fe3O4to ZnO/AgBr were prepared by a facile microwave-assisted method. The resultant samples were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), energy dispersive analysis of X-rays(EDX), and vibrating sample magnetometery(VSM). Antifungal activity of the as-prepared samples was evaluated against Fusarium graminearum and Fusarium oxysporum as two phytopathogenic fungi. Among the nanocomposites, the sample with 1:8 weight ratio of Fe3O4to ZnO/AgBr was selected as the best nanocomposite. This nanocomposite inactivates Fusarium graminearum and Fusarium oxysporum at 120 and 60 min, respectively. Moreover, it was observed that the microwave irradiation time has considerable influence on the antifungal activity and the sample prepared by irradiation for 10 min showed the best activity. Moreover, the nanocomposite without any thermal treatment displayed the superior activity.

关键词： Fe3O4/ZnO/AgBr Antifungal activity Magnetic nanocomposite Fusarium Microwave irradiation

Retroperitoneal fibrosis: A rare cause of both ureteral and small bowel obstruction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第43期12卷 7061-7063页

作者： Faisal aziz Srinivasulu Conjeevaram Than Phan Department of Surgery New York Medical College Valhallah NY 10595 United States Department of Surgery. North Oakland Medical Centers MI 48341 United States Attending Physician Department of Surgery North Oakland Medical Centers MI 48341 United States

Retroperitoneal fibrosis (RPF) is a rare condition of unclear etiology. It can cause ureteral obstruction. We present the unique case of a 54 years old female, who initially presented with spontaneous perforation of the cecum. Upon exploring the abdomen, the classical glistening white, unyielding retroperitoneal fibrosis was encountered. A right hemicolectomy was performed. Subsequently, the patient presented with bilateral ureteral obstruction, and later on with small bowel obstruction. Ureteral obstruction was treated with stents, and small bowel obstruction was treated with bypass. To our knowledge no case of idiopathic RPF presenting with features of both bilateral ureteral and small bowel obstruction has been reported in the literature.

关键词： Retroperitoneal fibrosis Ureteral obstruction Small bowel obstruction Surgery for retroperitonealfibrosis

Electromagnetic effects on the orbital motion of a charged spacecraft

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2014年第5期14卷 589-600页

作者： Yehia Ahmed Abdel-aziz Khalil Ibrahim Khalil National Research Institute of Astronomy and Geophysics (NRIAG) Helwan Cairo 11721Egypt Department of Mathematics Hail University Hail 2440 Kingdom of Saudi Arabia

This paper deals with the effects of electromagnetic forces on the orbital motion of a spacecraft. The electrostatic charge which a spacecraft generates on its surface in the Earth＇s magnetic field will be subject to a perturbative Lorentz force. A model incorporating all Lorentz forces as a function of orbital elements has been developed on the basis of magnetic and electric fields. This Lorentz force can be used to modify or perturb the spacecraft＇s orbits. Lagrange＇s planetary equations in the Gauss variational form are derived using the Lorentz force as a perturbation to a Keplerian orbit. Our approach incorporates orbital inclination and the true anomaly. The numer- ical results of Lagrange＇s planetary equations for some operational satellites show that the perturbation in the orbital elements of the spacecraft is a second order perturba- tion for a certain value of charge. The effect of the Lorentz force due to its magnetic component is three times that of the Lorentz force due to its electric component. In addition, the numerical results confirm that the strong effects are due to the Lorentz force in a polar orbit, which is consistent with realistic physical phenomena that occur in polar orbits. The results confirm that the magnitude of the Lorentz force depends on the amount of charge. This means that we can use artificial charging to create a force to control the attitude and orbital motion of a spacecraft.

关键词： space vehicles -- atmospheric effects -- celestial mechanics -- kine-matics and dynamics

Single cell whole-genome sequencing of brain cells:age-and cell-type specific mutational profiles

在线全文

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2024年第9期9卷 3544-3545页

作者： Melania Capasso N.Ahmad aziz Immune Regulation German Center for Neurodegenerative Diseases(DZNE)BonnGermany Population and Clinical Neuroepidemiology German Center for Neurodegenerative Diseases(DZNE)BonnGermany Department of Neurology Faculty of MedicineUniversity of BonnBonnGermany

In a recent study published in Cell,Ganz et *** new light on the mutational landscape of brain cells,particularly neurons and oligodendrocytes(OLs).1 Utilizing a combination of optimized single-cell whole-genome sequencing with single-nucleus chromatin accessibility and gene expression analysis,they profiled somatic mutations in 86 OLs from 13 neurotypical individuals,spanning in age from infants to *** investigated were 56,derived from 19(including 12 overlapping)individuals(Fig.1).

关键词： landscape cytes