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Fishery stock assessment of Kiddi shrimp (Parapenaeopsis stylifera) in the Northern Arabian Sea Coast of Pakistan by using surplus production models

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Chinese Journal of Oceanology and Limnology 2017年第4期35卷 936-946页

作者： MOHSIN muhammad 慕永通 MEMON Aamir Mahmood KALHORO muhammad Talib SHAH syed Baber Hussainin College of Fisheries Ocean University of China

Pakistani marine waters are under an open access regime. Due to poor management and policy implications, blind fishing is continued which may result in ecological as well as economic losses. Thus, it is of utmost importance to estimate fishery resources before harvesting. In this study, catch and effort data, 1996-2009, of Kiddi shrimp Parapenaeopsis stylifera fishery from Pakistani marine waters was analyzed by using specialized fishery software in order to know fishery stock status of this commercially important shrimp. Maximum, minimum and average capture production ofP. stylifera was observed as 15 912 metric tons （mr）（1997）, 9 438 mt （2009） and 11 667 mt/a. Two stock assessment tools viz. CEDA （catch and effort data analysis） and ASPIC （a stock production model incorporating covariates） were used to compute MSY （maximum sustainable yield） of this organism. In CEDA, three surplus production models, Fox, Schaefer and Pella-Tomlinson, along with three error assumptions, log, log normal and gamma, were used. For initial proportion （IP） 0.8, the Fox model computed MSY as 6 858 nat （CV=0.204, R^2=0.709） and 7 384 mt （CV=0.149, R^2=0.72） for log and log normal error assumption respectively. Here, gamma error produced minimization failure. Estimated MSY by using Schaefer and Pella-Tomlinson models remained the same for log, log normal and gamma error assumptions i.e. 7 083 mt, 8 209 mt and 7 242 mt correspondingly. The Schafer results showed highest goodness of fit R2 （0.712） values. ASPIC computed MSY, CV, R2, FMsv and BMsv parameters for the Fox model as 7 219 nat, 0.142, 0.872, 0.111 and 65 280, while for the Logistic model the computed values remained 7 720 mt, 0.148, 0.868, 0.107 and 72 110 correspondingly. Results obtained have shown that P. stylifera has been overexploited. Immediate steps are needed to conserve this fishery resource for the future and research on other species of commercial importance is urgently needed.

关键词： stock assessment fishery management Parapenaeopsis stylifera surplus production models Pakistan

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Foliation and the First Law of Black Hole Thermodynamics

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Chinese Physics Letters 2011年第5期28卷 54-56页

作者： Azad A.Siddiqui syed muhammad Jawwad Riaz M.Akbar Department of Basic Sciences and Humanities EME CollegeNational University of Sciences and Technology(NUST)Peshawar RoadRawalpindiPakistan Centre for Advanced Mathematics and Physics National University of Sciences and Technology(NUST)Sector H-12IslamabadPakistan

There has been lots of interest in exploring the thermodynamic properties at the horizon of a black hole *** has been shown earlier that for different spacetimes,the Einstein field equations at the horizon can be expressed as the first law of black hole *** the idea of foliation,we develop a simpler procedure toobtain such *** considerγ=constant slices,for the Schwarzschild and Reissner-Nordstrom black hole *** Einstein field equations for the induced 3-dimensional metrics of the hypersurfaces are expressed in thermodynamic quantities under the virtual displacements of the *** expected,it is found that the field equations of the induced metric corresponding to the horizon can be written as afirst law of black hole *** is to be mentioned here that our procedure is much easier,to obtain such results,as here one has to essentially deal with(n-1)-dimensional induced metric for an n-dimensional spacetime.

关键词： thermodynamic Einstein mentioned

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Use of Impella cardiac axial flow pump for cardiogenic shock(A newer alternative)-How good is the evidence?

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BIOCELL 2022年第5期46卷 1139-1150页

作者： RAFIQ AHMED BHAT syed MANZOOR ALI YOOSUF ALI ASHRAF muhammad HUSSENBOCUS AKANKSHA RATHI JAVAID AKHTER BHAT ABDUL ALEEM KHAN syed MAQBOOL RAJA SAQIB IQBAL MD MONOWARUL ISLAM YONGSHENG QU YOU ZHANG YUXIAO SUN WENTAO XIAO ABHISHEK TIBREWAL CHUANYU GAO Zhengzhou University People’s Hospital Department of CardiologyFuwai Central China Cardiovascular HospitalZhengzhouChina Department of Cardiology Super Speciality DivisionGovernment Medical CollegeSrinagarIndia Department of Rheumatology and Immunology Nanjing Drum Tower Hospital Clinical College of Nanjing Medical UniversityNanjingChina Department of Community Medicine Vedanta Institute of Medical SciencesPalgharIndia State Key Laboratory of Crop Genetics and Germplasm Enhancement Nanjing Agricultural UniversityNanjingChina Department of Orthopaedics Nanjing First HospitalNanjing Medical UniversityNanjingChina Department of Paediatrics Batra Hospital and Medical Research CentreNew DelhiIndia Zhengzhou University First Affiliated Hospital ZhengzhouChina Department of Community Medicine Institute of Biostatistics and EpidemiologyGurgaonIndia

The adverse outcomes of a ventricular heart failure(left,right or biventricular)caused by cardiogenic shock are aggravated by lung oedema and organ mal *** advances in medical sciences,revascularisation and mechanical hemodynamic support have proved ineffective in reducing the mortality rate in such patients.A thorough study of the data available about cardio-vascular diseases reveals that the application of conventional methods of treatment are least helpful to practically restore normal functions of heart when it experiences end-stage systolic ventricular ***,to overcome the challenges and find alternatives to address this issue,percutaneous ventricular support devices/machines were designed and successfully *** devices have revolutionized the treatment of ventricular heart failures and are now in use all over the *** this review paper a newer mechanical circulatory support(MCS)device,Impella,has been discussed and compared with a few other devices like Intra-aortic Balloon Pump(IABP),Extracorporeal Circulation(ECLS)and Veno-arterial Extracorporeal Membrane Oxygenation(VA-ECMO).This article studies the challenges being faced during the treatment of cardiogenic shock,and thoroughly discusses the use and effectiveness of Impella Cardiac Axial Pump in each *** can be said that mechanical circulatory support(MCS)device use during percutaneous coronary intervention(PCI)should be individualized based on multiple factors with a recommended use in patients with the greatest potential benefit and a relatively low risk of device-related *** current literature suggests that the outcomes of use of Impella and other mechanical circulatory support devices like IABP and VA-ECMO are *** there seem to be a few advantages of Impella over the others,sufficiently powered,multi-centric,randomised control trials are needed to establish its superiority.

关键词： Cardiogenic shock Hemodynamic support Impella Cardiac Axial Pump IABP VA-ECMO

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腐殖酸对土壤理化性质及盐胁迫下小麦幼苗生理生化特性的影响

腐殖酸对土壤理化性质及盐胁迫下小麦幼苗生理生化特性的影响

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作者： syed muhammad Mustajab Shah 西南科技大学

学位级别：硕士

盐胁迫是影响植物生长、造成农作物减产的主要非生物胁迫之一。盐胁迫会使植物产生过量的ROS（Reactive oxygen species）并造成氧化损伤,为了减轻这种损伤,植物利用各种抗氧化酶,包括过氧化氢酶（CAT）、过氧化物酶（POD）和超氧化物... 详细信息

盐胁迫是影响植物生长、造成农作物减产的主要非生物胁迫之一。盐胁迫会使植物产生过量的ROS（Reactive oxygen species）并造成氧化损伤,为了减轻这种损伤,植物利用各种抗氧化酶,包括过氧化氢酶（CAT）、过氧化物酶（POD）和超氧化物歧化酶（SOD）等来清除ROS以调节氧化还原平衡。同时,盐胁迫引起的渗透胁迫还可降低植物根系对水分和其他营养物质的吸收。腐殖酸肥料是一种将腐殖酸与氮、磷、钾等元素结合制成的肥料,其具有肥料增效、改良土壤、刺激作物生长、改善农产品质量等功能。小麦（Triticum aestivum L.）是中国主要的粮食作物之一,为探究腐殖酸肥料施用对土壤理化性质及盐胁迫下小麦幼苗生理生化特性的影响,本研究测定了不同浓度腐殖酸肥料（0.1、0.3和0.6 g/L）施用下土壤的p H、电导率及营养物质的含量,以及两个小麦品种（JM-47和Yr-39）幼苗在不同盐浓度（100和200 m M NaCl）处理下的生长、生理、光合和抗氧化指标。具体试验结果如下:（1）盐处理可显著抑止小麦JM-47和Yr-39种子萌发和幼根生长,且抑止程度随处理浓度的增加而增加。JM-47种子在200 m M NaCl处理下的萌发率（Gr）、萌发势（Ge）和萌发指数（Gi）分别为75.83%、59.16%和4.33,与对照（0 m M NaCl）相比分别降低了20.87%、37.17%和20.11%。与JM-47相比,盐处理对Yr-39种子萌发和幼根生长的抑制程度更大。（2）施用腐殖酸肥料可显著减缓盐胁迫对小麦幼苗JM-47和Yr-39生长的抑制作用。在200 m M NaCl处理下,与不施用腐殖酸肥料相比,施用0.6 g/L腐殖酸肥料的JM-47幼苗的分蘖数、叶面积、叶片数量、株高、根长、鲜重和干重分别增加了133.33%、8.65%、66.66%、120.45%、312.14%、237.18%和251.58%,Yr-39幼苗分别增加了133.33%、8.75%、66.66%、81.56%、256.19%、240.43%和253.65%。（3）施用腐殖酸肥料可显著减缓盐胁迫对小麦幼苗JM-47和Yr-39光合色素含量、光合特性、荧光特性的抑制作用。在200 m M NaCl处理下,与不施用腐殖酸肥料相比,施用0.6 g/L腐殖酸肥料的JM-47幼苗的光合色素a和b分别增加了54.99%和47.69%,Yr-39幼苗分别增加了74.94%和35.93%;JM-47幼苗的蒸腾速率（E）、光合速率（Pn）和气孔导度（gsw）分别增加了169.23%、127.09%和176.16%,Yr-39幼苗分别增加了188.53%、359.81%、270.52%;JM-47幼苗的最大荧光（Fm）、荧光的最大量子产率（Fv/Fm）、暗反应（R）、荧光的最大量子产率（PSII）和光化学猝灭（q P）分别增加了86.29%、60.67%、52.04%75.62%和102.94%,Yr-39幼苗分别增加了75.18%、66.03%、54.465%、85.51%和111.32%。（4）施用腐殖酸肥料显著降低了小麦幼苗JM-47和Yr-39的抗氧化酶活性。在200 m M NaCl处理下,与不施用腐殖酸肥料相比,施用0.6 g/L腐殖酸肥料的JM-47幼苗的SOD、POD和CAT活性分别降低了-20.46%、-23.83%和-29.035,Yr-39幼苗分别降低了-25.52%、-16.97%和-24.85%;JM-47幼苗的MDA含量降低了-35.71%,而Yr-39幼苗降低了-25.28%。（5）施用腐殖酸肥料显著降低了土壤p H和电导率,与不施用腐殖酸相比,施用0.6 g/L腐殖酸肥料的土壤p H和电导率分别降低了-18.40%和-12.52%。但是,施用腐殖酸肥料显著增加了土壤营养元素的含量,与不施用腐殖酸相比,施用0.6 g/L腐殖酸肥料的土壤的氮、磷、钾、硫、碳和氢分别增加了27.61%、85.91%、41.28%、61.95%、39.32%和24.55%,碳氮比（C/N）和碳氢比（C/H）分别降低了8.48%和29.03%。综上,这些结果暗示腐殖酸肥料可通过改良土壤营养,提高小麦幼苗对盐胁迫的抗性,本研究结果可为应用腐殖酸肥料改善盐胁迫下作物的生长提供基础数据。

关键词：小麦幼苗腐植酸肥料盐胁迫土壤营养

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Analysis and Characterization of Normally-Off Gallium Nitride High Electron Mobility Transistors

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Computers, Materials & Continua 2021年第10期69卷 1021-1037页

作者： Shahzaib Anwar Sardar muhammad Gulfam Bilal muhammad syed Junaid Nawaz Khursheed Aurangzeb Mohammad Kaleem Department of Electrical and Computer Engineering COMSATS University Islamabad(CUI)Islamabad45550Pakistan CTIF Global Capsule Department of Business Development and TechnologyAarhus University7400HerningDenmark Computer Engineering Department College of Computer and Information SciencesKing Saud UniversityRiyadh11543Saudi Arabia

High electron mobility transistor(HEMT)based on gallium nitride(GaN)is one of the most promising candidates for the future generation of high frequencies and high-power electronic *** research work aims at designing and characterization of enhancement-mode or normally-off GaN *** impact of variations in gate length,mole concentration,barrier variations and other important design parameters on the performance of normally-off GaN HEMT is thoroughly *** increase in the gate length causes a decrease in the drain current and transconductance,while an increase in drain current and transconductance can be achieved by increasing the concentration of aluminium(Al).For Al mole fractions of 23%,25%,and 27%,within Al gallium nitride(AlGaN)barrier,the GaN HEMT devices provide a maximum drain current of 347,408 and 474 mA/μm and a transconductance of 19,20.2,21.5 mS/μm,***,for Al mole fraction of 10%and 15%,within AlGaN buffer,these devices are observed to provide a drain current of 329 and 283 mA/μm,***,for a gate length of 2.4,3.4,and 4.4μm,the device is observed to exhibit a maximum drain current of 272,235,and 221 mA/μm and the transconductance of 16.2,14,and 12.3 mS/μm,*** is established that a maximum drain current of 997 mA/μm can be achieved with an Al concentration of 23%,and the device exhibits a steady drain current with enhanced *** observations demonstrate tremendous potential for two-dimensional electron gas(2DEG)for securing of the normally-off mode operation.A suitable setting of gate length and other design parameters is critical in preserving the normally-off mode operation while also enhancing the critical performance parameters at the same *** to the normallyon depletion-mode nature of GaN HEMT,it is usually not considered as suitable for high power levels,frequencies,and *** such settings,a negative bias is required to enter the blocking conditi

关键词： High electron mobility GaN HEMT bipolar transistors gallium nitride heterojunctions MOS devices

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Effect of compression deformation on precipitation phase behavior of B-containing S31254 super austenitic stainless steel

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Journal of Iron and Steel Research International 2019年第7期26卷 712-719页

作者： Jin-gang Bai Yi-shi Cui Jian Wang Nan Dong muhammad saqlain Qurashi Hai-rui Wei Yong-chao Yang Pei-de Han College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 Shanxi China State Key Laboratory of Advanced Stainless Steel Materials Taiyuan 030003 Shanxi China

Effects of compression deformation on the sigma-phase precipitation behavior of B-containing S31254 stainless steel after solution treatment were studied using the Gleeble compression test. The cold and hot processing characteristics of B-containing S31254 stainless steel were evaluated, and the results show that the speed of compression deformation increased the precipitation rate of the sigma phase, and the location of precipitation extended from the austenite grain boundary to the original hot rolling deformation area. During cold deformation at room temperature, the precipitation rate increased when the deformation reached at 40%. Deformation at 950℃ affected precipitation more obviously. At 1074 ℃, when the deformation reached 20%, the precipitated phases started increasing, and above this deformation range, precipitation began decreasing. Also, at 1074℃ the deformation accelerated the precipitation of sigma phase;but with deformation, there was a change in critical temperature for the sigma-phase excursion. The precipitation position of the sigma phase is strongly related to the area of the original hot rolling deformation. With an increase in the deformation amount, precipitates in this region appeared as coarse-grained, skeletal, and network-like features.

关键词： Compression deformation Super austenitic stainless steel Precipitate phase Alloying Microstructure

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Acute exacerbation of interstitial lung disease in the intensive care unit:Principles of diagnostic evaluation and management

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World Journal of Critical Care Medicine 2023年第3期12卷 153-164页

作者： muhammad K Hayat syed Or Bruck Anupam Kumar Salim Surani Pulmonary and Critical Care Medicine Baylor College of MedicineHoustonTX 77030United States Department of Medicine and Pharmacology Texas A&M UniversityCollege StationTX 77843United States

Interstitial lung disease(ILD)is typically managed on an outpatient *** care physicians manage patients with ILD in the setting of an acute exacerbation(ILD flare)causing severe *** principles of management of acute exacerbation of ILD are different from those used to manage patients with acute respiratory distress syndrome from sepsis,*** patients may be candidates for aggressive measures like extracorporeal membrane oxygenation and lung transplantation,while almost all patients will benefit from early palliative *** review focused on the types of ILD,diagnosis,and management pathways for this challenging condition.

关键词： Interstitial lung disease Pulmonary fibrosis Acute exacerbation of interstitial lung disease Extracorporeal membrane oxygenation Interstitial lung disease flare Immunosuppression

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MHD Maxwell Fluid with Heat Transfer Analysis under Ramp Velocity and Ramp Temperature Subject to Non-Integer Differentiable Operators

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Computer Modeling in Engineering & Sciences 2021年第2期126卷 821-841页

作者： Thabet Abdeljawad muhammad Bilal Riaz syed Tauseef Saeed Nazish Iftikhar Department of Mathematics and General Sciences Prince Sultan UniversityRiyadh12435Saudi Arabia Department of Medical Research China Medical UniversityTaichung404Taiwan Department of Computer Science and Information Engineering Asia UniversityTaichung41354Taiwan Department of Mathematics University of Management and TechnologyLahore54770Pakistan Institute for Groundwater Studies(IGS) University of the Free StateBloemfontein9301South Africa Department of Science&Humanities National University of Computer and Emerging SciencesLahore54000Pakistan

The main focus of this study is to investigate the impact of heat generation/absorption with ramp velocity and ramp temperature on magnetohydrodynamic(MHD)time-dependent Maxwell fluid over an unbounded plate embedded in a permeable ***-dimensional parameters along with Laplace transformation and inversion algorithms are used to find the solution of shear stress,energy,and velocity ***,new fractional differential operators are used to define ramped temperature and ramped *** obtained analytical solutions are plotted for different values of emerging *** time derivatives are used to analyze the impact of fractional parameters(memory effect)on the dynamics of the *** making a comparison,it is observed that the fractional-order model is best to explain the memory effect as compared to classical *** results suggest that the velocity profile decrease by increasing the effective Prandtl *** existence of an effective Prandtl number may reflect the control of the thickness of momentum and enlargement of thermal *** incremental value of the M is observed for a decrease in the velocity field,which reflects to control resistive ***,it is noted that the Atangana-Baleanu derivative in Caputo sense(ABC)is the best to highlight the dynamics of the *** influence of pertinent parameters is analyzed graphically for velocity and energy *** for skin friction and Nusselt number are also derived for fractional differential operators.

关键词： MHD Maxwell fluid fractional differential operator heat generation absorption thermal effect non-singular kernels

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Exploration of uniform heat flux on the flow and heat transportation of ferrofluids along a smooth plate： Comparative investigation

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International Journal of Biomathematics 2018年第4期11卷 57-75页

作者： muhammad Usman muhammad Hamid syed Tauseef Mohyud Din Asif Waheed Wei Wang School of Mathematical Sciences Peking University Beijing 100871 P. R. China Department of Mathematics Faculty of Sciences HITEC University Taxila Cantt Pakistan Department of Mathematics COMSATS Institute of Information Technology Attock Pakistan

The paper is devoted to a new extension in Gegenbauer wavelet method （GWM） to investigate the transfer of heat and MHD boundary-layer flow of ferrofluids beside a flat plate with velocity slip. A homogenous model study is conducted in which we assumed the heat transfer and forced convective flow of ferrofluids along a flat plate with a uniform wall heat flux. In the direction of transverse to plate, a magnetic field is imposed. Three various magnetic nanoparticle types including Mn-ZnFe204, CoFe204, Fe3O4 are incorporated inside the base fluid. Two types of base fluids （water and kerosene） with bad thermal conductivity as compared to nanoparticles of solid magnetic have been assumed. The mathematical model is tackled via modified Gegenbauer wavelet method （MGWM）. A simulation is accomplished for individual ferrofluid mixture by assuming the prevailing impacts of uniform and slip heat fluxes. The variation of heat transfers and skin friction were also observed at the surface of the plate and we analyzed the better heat transfer for every mixture. Kerosene-based magnetite （Fe304） delivers the better rate of heat transfer at wall due to its association with the kerosene-based Mn-Zn and cobalt ferrites. The slip velocity and magnetic field effects on the temperature, dimensionless velocity, rate of heat transfer and skin friction are examined for various magnetic nanoparticles inside the kerosene oil and water. We observed that the primary influence of magnetic field reduces the dimensionless surface temperature and accelerates the dimensionless velocity as compared to the hydrodynamic case, thus enhancing the rate of heat transfer and skin friction ferrofluids. Moreover, a detailed evaluation of outcomes obtained by MGWM, already published work and numerical RK-4 were found to be in excellent agreement. The error and convergence analysis are presented. Comparison of results,graphical plots, error and convergence analysis reveal the appropriateness of proposed method. T

关键词： Gegenbauer polynomials collocation method ferrofluids heat flux numericalsolution.

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Thermal Conductivity of Complex Plasmas Using Novel Evan-Gillan Approach

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Communications in Theoretical Physics 2018年第6期69卷 704-710页

作者： Aamir Shahzad syed Irfan Haider muhammad Kashif muhammad Shahzad Shifa Tariq Munir Mao-Gang He Molecular Modeling and Simulation Laboratory Department of PhysicsGovernment College University Faisalabad(GCUF)Allama Iqbal RoadFaisalabad 38040Pakistan Key Laboratory of Thermo-Fluid Science and Engineering Ministry of Education(MOE)Xi'an Jiaotong UniversityXi'an 710049China

The thermal conductivity of complex fluid materials （dusty plasmas） has been explored through novel Evan-Gillan homogeneous non-equilibrium molecular dynamic （HNEMD） algorithm. The thermal conductivity coefficient obtained from HNEMD is dependent on various plasma parameters （T,k）. The proposed algorithm gives accurate results with fast convergence and small size effect over a wide range of plasma parameters. The cross microscopic heat energy current is discussed in association with variation of temperature （1/Г） and external perturbations （Pz）. The thermal conductivity obtained from HNEMD simulations is found to be very good agreement and more reliable than previously known numerical techniques of equilibrium molecular dynarnic, nonequilibrium molecular dynamic simulations. Our new investigations point to an effective conclusion that the thermal conductivity of complex dusty plasmas is dependent on an extensive range of plasma coupling （P） and screening parameter （k） and it varies by the alteration in these parameters. It is also shown that a different approach is used for computations of thermal conductivity in 2D complex plasmas and can be appropriate method for behaviors of complex systems.

关键词： complex dusty plasma homogenous nonequilibrium molecular dynamics canonical ensemble scaling law thermal conductivity Yukawa liquids

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