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Propagation of Ion solitary Pulses in Dense Astrophysical Electron-Positron-Ion Magnetoplasmas

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Plasma science and Technology 2015年第12期17卷 1000-1005页

作者： ATA-UR-RAHMAN s.a.khan A.QAMAR Department of Physics Theoretical Plasma Physics GroupIslamia College Peshawar(A Public Sector University) National Centre for Physics QAU Campus Department of Physics University of Peshawar

In this paper,we theoretically investigate the existence and propagation of low amplitude nonlinear ion waves in a dense plasma under the influence of a strong magnetic *** plasma consists of ultra-relativistic and degenerate electrons and positrons and non-degenerate cold ***,the appearance of two distinct linear modes and their evolution is studied by deriving a dispersion equation with the aid of Fourier ***,the dynamics of low amplitude ion solitary structures is investigated via a Korteweg-de Vries equation derived by employing a reductive perturbation *** effects of various plasma parameters like positron concentration,strength of magnetic field,obliqueness of field,etc.,are discussed in *** the end,analytical results are supplemented through numerical analysis by using typical representative parameters consistent with degenerate and ultra-relativistic magnetoplasmas of astrophysical regimes.

关键词： degenerate relativistic perturbation solitary representative Electron appearance dense collective normalized

shocks and solitons in Ultradense Degenerate Electron-Positron-Ion Plasmas

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Communications in Theoretical Physics 2011年第1期55卷 151-157页

作者： s.a.khan Arshad M.Mirza National Centre for Physics Quaid-i-Azam University Campusand Department of PhysicsCOMSATS Institute of Information Technology Theoretical Plasma Physics Group Department of PhysicsQuaid-i-Azam University

The formation and propagation of shocks and solitons are investigated in an unmagnetized, ultradense plasma containing degenerate Fermi gas of electrons and positrons, and classical ion gas by employing Thomas-Fermi model. For this purpose, a deformed Korteweg-de Vries-Berger （dKdVB） equation is derived using the reductive perturbative technique for cold, adiabatic, and isothermal ions. Localized analytical solutions of dKdVB equation in planar geometry are obtained for dispersion as well as dissipation dominant cases. For nonplanar （cylindrical and spherical） geometry, time varying numerical shock wave solution of dKdVB equation is found. Its dispersion dominant case leading to the soliton solution is also discussed. The effect of ion temperature, positron concentration and dissipation is found significant on these nonlinear structures. The relevance of the results to the systems of scientific interest is pointed out.

关键词： degenerate plasma nonplanar geometry shocks solitons

Damped Kadomtsev–Petviashvili Equation for Weakly Dissipative solitons in Dense Relativistic Degenerate Plasmas

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Communications in Theoretical Physics 2017年第12期67卷 783-790页

作者： s.Ahmad Ata-ur-Rahman s.a.khan F.Hadi Department of Physics University of Kotli Azad Jammu and Kashmir Department of Physics Theoretical Plasma Physics Group Islami a College Peshawar (A Public Sector University) National Centre for Physics Quaid-i-Azam University Campus Department of Nuclear Engineering Kyoto University Department of Applied Physical and Material sciences University of Swat

We have investigated the properties of three-dimensional electrostatic ion solitary structures in highly dense collisional plasma composed of ultra-relativistically degenerate electrons and non-relativistic degenerate ions. In the limit of low ion-neutral collision rate, we have derived a damped Kadomtsev–Petviashvili(KP) equation using perturbation analysis. supplemented by vanishing boundary conditions, the time varying solution of damped KP equation leads to a weakly dissipative compressive soliton. The real frequency behavior and linear damping of solitary pulse due to ion-neutral collisions is discussed. In the presence of weak transverse perturbations, soliton evolution with damping parameter and plasma density is delineated pointing out the extent of propagation using typical parameters of dense plasma in the interior of white dwarfs.

关键词： dissipative solitons damped Kadomtsev–Petviashvili equation

Complementary effect of zoo compost with mineral nitrogen fertilisation increases wheat yield and nutrition in a low-nutrient soil

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Pedosphere 2022年第2期32卷 339-347页

作者： Muhammad s.a.khan Lynette K.ABBOTT Zakaria M.sOLAIMAN Peter R.MAWsON Ian s.WAITE sasha N.JENKINs school of Agriculture and Environment Institute of AgricultureThe University of Western AustraliaPerth WA 6009Australia Perth Zoo Department of BiodiversityConservation and AttractionsPerth WA 6151Australia Agricultural Officer(Headquarters) DirectorateSoil Fertility Research InstituteAgriculture DepartmentGovernment of the PunjabLahore 53700Pakistan

Excess nitrogen(N) fertiliser use in agriculture is associated with water pollution and greenhouse gas *** practices and programs to reduce N fertiliser application continue to be developed,inefficient fertiliser use *** that reduce mineral N fertiliser application are needed in a sustainable agricultural ecosystem to control leaching and gaseous losses for environmental *** study evaluated whether fully or partially replacing mineral N fertiliser with zoo compost(Perth Zoo) could be a good mitigation strategy to reduce mineral N fertiliser application without affecting wheat yield and *** achieve this,a glasshouse experiment was conducted to assess the complementary effect of zoo compost and mineral N fertiliser on wheat yield and nutrition in a sandy soil of southwestern ***,a chlorophyll meter was used to determine whether there was a correlation between chlorophyll content and soil mineral N content,grain N uptake,and grain protein content at the tillering(42 d after sowing(DAs)) and heading(63 DAs) growth *** standard practice for N application for this soil type in this area,100 kg ha^(-1),was used with a soil bulk density of 1.3 g cm^(-3) to calculate the amount of mineral N(urea,46% N) and Perth Zoo compost(ZC)(0.69% N) for each *** comprised a control(no nutrients added,T1),mineral N only(100 kg N ha^(-1),T2),ZC only(100 kg N ha^(-1),T7),and combinations of mineral N and ZC at different rates(mineral N at 100 kg N ha^(-1)+ ZC at 25 kg N ha^(-1)(T3),mineral N at 75 kg N ha^(-1)+ ZC at 25 kg N ha^(-1)(T4),mineral N at 75 kg N ha^(-1)+ ZC at 50 kg N ha^(-1)(T5),and mineral N at 50 kg N ha^(-1)+ ZC at 50 kg N ha^(-1)(T6)).The T6 treatment significantly increased grain yield(by 26%) relative to the T2 ***,the T7 treatment did not affect grain yield when compared to the T2 *** treatments with mineral N and ZC in combination significantly improved the

关键词： chlorophyll meter sPAD measurement integrated nutrient management nitrogen use efficiency reduced N fertiliser application wheat yield

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一种提高C3+收率的工艺过程

石油石化节能与计量 1986年第4期 63-64页

作者： s.a.khan 王迂冬

DHX工艺流程能从溶解气、炼厂气和天然气中提高C3+收率几乎达100％。此过程已在加拿大埃索资源公司的朱地克里克工厂得到证实。将一套深冷膨胀装置进行了改造后,收率由72％增加到95％,在进气量衡定的操作情况下,收率达100％。它的改造... 详细信息

DHX工艺流程能从溶解气、炼厂气和天然气中提高C3+收率几乎达100％。此过程已在加拿大埃索资源公司的朱地克里克工厂得到证实。将一套深冷膨胀装置进行了改造后,收率由72％增加到95％,在进气量衡定的操作情况下,收率达100％。它的改造投资费少于75万美元,而额外得到的丙烷和较重的烃烷为800～1000桶/日。

关键词：脱乙烷塔乙烷进料烷烃 C3 液体甲烷烃类收率

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苏门答腊-安达曼地震的GPs分析

世界地震译丛 2005年第1期36卷 9-12页

作者： s.a.khan O．Gudmundsson 左玉玲郑需要不详中国地震局地球物理研究所

2004年12月26日印度尼西亚苏门答腊地震是历史上破坏性最强的地震之一。此次地震的震级Mw=9．3(根据stein和Okal以简正模式振幅修订，http：//***／people／seth／research／***)，是自1900年以来记录到的第二最大地震。它发生在苏门答... 详细信息

2004年12月26日印度尼西亚苏门答腊地震是历史上破坏性最强的地震之一。此次地震的震级Mw=9．3(根据stein和Okal以简正模式振幅修订，http：//***／people／seth／research／***)，是自1900年以来记录到的第二最大地震。它发生在苏门答腊岛北部以西100千米的近海处，

关键词：苏门答腊—安达曼地震 GPs 震级板块运动断层带海啸全球定位系统

Human leukocyte antigen B polymorphism and association between HLA-B27 and endoplasmic reticulum aminopeptidase 1 rs30187 sNP in patients with ankylosing spondylitis in Bangladesh

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Rheumatology & Autoimmunity 2022年第1期2卷 15-21页

作者： Md Kamrul H.sajib shamim Ahmed syed A.Haq Minhaj R.Choudhury Mohammed Uddin Furkan Uddin Muhammad s.a.khan Mohammad M.Zaman Department of Rheumatology Dhaka Medical College HospitalDhakaBangladesh Department of Rheumatology Bangabandhu Sheikh Mujib Medical UnivesityDhakaBangladesh Department of Human Genetics Mohammed Bin Rashid University of Medicine and Health SciencesCollege of MedicineDubaiUAE Genetics and Genomic Department NeuroGen HealthcareDhakaBangladesh Department of Medicine Sheikh Hasina Institute of Burn and Plastic SurgeryDhakaBangladesh Advisor(Research and Publication) World Health OrganizationDhakaBangladesh

Objectives:To determine the association of Human leukocyte antigen B(HLA‑B)alleles with ankylosing spondylitis and the allelic association of HLAB27 with endoplasmic reticulum aminopeptidase 1(ERAP1)single-nucleotide polymorphism(sNP)rs30187 in patients with ankylosing spondylitis(As).Methods:We studied 48 consecutively enrolled well-defined As patients and 48 healthy controls recruited from the outpatient clinic of the rheumatology department of Bangabandhu sheikh Mujib Medical University(BsMMU),Dhaka,*** genotype HLA-B alleles from peripheral blood DNA,we designed sequence-specific primers for polymerase chain ***'s sequencing method was used to detect the ERAP1 rs30187 *** HLA-B allele distributions were compared between cases and *** infer an allelic association between HLA-B27 and ERAP1,allele distributions from both loci were compared using ***-squared test or Fisher's exact test was used to quantify the association,and their strength of association was tested by odds ratio(OR)with 95%confidence interval(CI).Results:The frequency of HLA-B27 was found to be higher in As patients(60.4%)than in healthy controls(8.3%).HLA-B27 allele had an OR of 16.8(95%CI=5.2–54.4)for the development of ***,4%of As patients had both HLA-B27 and *** significant association was found between ERAP1 rs30187 sNP and HLA-B27 in patients with As(OR=1.7,95%CI=0.5–5.6).Conclusions:HLA-B27 was significantly associated with As in patients in ***,no association between ERAP1 rs30187 sNP and HLA-B27 was observed.

关键词： As Bangladesh ERAP1 rs30187 sNP HLA-B HLA-B27

HLA-DQ and-DR alleles in patients with sLE:A tertiary hospital-based case–control study in Bangladesh

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Rheumatology & Autoimmunity 2023年第1期3卷 43-49页

作者： Muhammad s.a.khan shamim Ahmed Iftekhar H.Bandhan Farhana Zaman MdKamrul H.sajib shirin Tarafder Minhaj R.Choudhury syed A.Haq Mohammad M.Zaman sheikh Hasina National Institute of Burn and Plastic surgery DhakaBangladesh Department of Rheumatology Bangabandhu Sheikh Mujib Medical UniversityDhakaBangladesh Upazilla Health Complex BancharampurB-BariaBangladesh Department of Community Medicine Universal Medical CollegeDhakaBangladesh Department of Rheumatology Dhaka Medical College HospitalDhakaBangladesh Green Life Center for Rheumatic Care and Research DhakaBangladesh World Health Organization DhakaBangladesh

Background:systemic lupus erythematosus(sLE)is a systemic autoimmune disease characterized by the involvement of multiple organs and autoantibody *** study aimed to determine the association of human leukocyte antigen(HLA)-DQ and-DR alleles with sLE at a tertiary hospital in ***:This case-control study was conducted in the Department of Rheumatology,Bangabandhu sheikh Mujib Medical University(BsMMU),Dhaka,*** patients who fulfilled the 1997 revised American College of Rheumatology classification criteria for sLE were considered cases(n=41).The controls(n=32)were selected from the hospital staff of BsMMU,including doctors and nurses who did not suffer from any known rheumatic diseases,and there was no such disease in their first-degree *** chain reaction using a sequence-specific primer(PCRssP)in a low-resolution typing method was carried out on blood samples collected for HLA-DQ and-DR allele ***:The cases and controls had comparable mean ages(31 vs.32 years),and most cases were female(95.1%vs.34.4%).The most frequent clinical manifestations were mucocutaneous(85.4%),followed by musculoskeletal(70.7%)and constitutional symptoms(58.5%).The cases had a significantly higher frequency of HLA-DR2 allele compared with healthy controls(70.7%vs.43.8%;odds ratio:3.1;95%confidence interval:1.2-8.2).In addition,HLADQ6 allele was found to have a significant association with mucocutaneous manifestations of the cases(88.9%,P=0.03).Conclusions:Bangladeshi adults having HLA-DR2 may be more susceptible to ***-DQ6 allele might be associated with mucocutaneous manifestations of sLE.

关键词： alleles Bangladesh HLA-DQ HLA-DR systemic lupus erythematosus

日粮中添加硒和维生素E对肉鸡免疫系统的影响

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饲料研究 2013年第3期36卷 31-32页

作者： M.I.Hussain s.a.khan Z.I.Chaudhary A.Aslam K.Ashraf M.F.Rai 黄鑫戴晋军李彪谭斌李春松安琪酵母股份有限公司动物营养事业部

试验旨在研究有机硒、无机硒及维生素E对肉鸡免疫系统的影响。试验选用130只1日龄肉鸡分为3个组,其中A和B组为试验组,各60只鸡,C组为对照组,10只鸡。A组日粮中添加有机硒和维生素E,A组又细分为A1、A2、A3、A4、A5和A6组,其中有机硒的添... 详细信息

试验旨在研究有机硒、无机硒及维生素E对肉鸡免疫系统的影响。试验选用130只1日龄肉鸡分为3个组,其中A和B组为试验组,各60只鸡,C组为对照组,10只鸡。A组日粮中添加有机硒和维生素E,A组又细分为A1、A2、A3、A4、A5和A6组,其中有机硒的添加量分别为0.25、0.25、0.5、0.5、1.0和1.0 mg/kg,维生素E的添加量为0、200、0、200、0和200 IU/kg。B组日粮中添加无机硒和维生素E,也分为B1、B2、B3、B4、B5和B6组,其中无机硒的添加量分别为0.25、0.25、0.5、0.5、1.0和1.0 mg/kg,维生素E的添加量为0、200、0、200、0和200 IU/kg。C组为对照组,饲料中不添加硒和维生素E。检测指标包括新城疫病毒(HI)抗体滴度、免疫器官的病理变化、免疫器官指数和生长性能。试验结果表明,日粮中加入有机硒后,能提高肉鸡免疫力,效果优于添加无机硒;同时,硒与维生素E配合使用的效果优于单一添加硒。

关键词：硒维生素E 肉鸡免疫系统免疫器官