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FIXED POINT THEOREmS AND BEST APPROXImATION IN CONVEX mETRIC SPACES

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Analysis in Theory and Applications 1992年第4期8卷 97-105页

作者： I.Beg N.shahzad m.Iqbal Quaid-i-Azam University Pakistan

Results regarding best approximation and best Simultaneous approximation on convex metric spaces are *** of fixed points for an ultimately nonexpansive semigroup of mappings is also shown.

关键词： CIG FIXED POINT THEOREmS AND BEST APPROXImATION IN CONVEX mETRIC SPACES

Dual-Wavelength Holmium-Doped Fiber Laser Pumped by Thulium-Ytterbium Co-Doped Fiber Laser

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Chinese Physics Letters 2016年第5期33卷 39-42页

作者： A.A.Latiff A.Dhar S.W.Harun I.m.babar S.Das m.C.Paul H.Ahmad Photonics Research Center University of Malaya Faculty of Electronics & Computer Engineering Universiti Teknikal Malaysia Melaka CSIR-Central Glass and Ceramic Research Institute Department of Electrical Engineering University of Malaya

We present an all-fiber dual-wavelength holmium-doped veloped holmium-doped fiber （HDF） as a gain medium fiber laser operating in 2 #m region using a newly de- The proposed fiber laser is constructed by using a hybrid gain medium, i.e., a thulium ytterbium co-doped fiber （TYDF） and an HDF in conjunction with a simple half-opened linear cavity, which is formed by a broadband mirror and an output coupler reflector. Without the HDF, the TYDF laser operates at wavelengths of 1991 and 1999nm with a signal-to-noise ratio of more than 34dB and the slope efficiency of 26.16 %. With the HDF, dual-wavelength output lines are obtained at 2075 and 2083nm with signal-to-noise ratios of more than difference between the two peaks of less than 1 dB at 17dB, 3dB bandwidth of less than 0.2nm and the power the TYDF laser pump power of 320roW.

关键词： by in is as nm of Dual-Wavelength Holmium-Doped Fiber Laser Pumped by Thulium-Ytterbium Co-Doped Fiber Laser HDF

magnetic Behaviour of Sm2Co7/Fe/Sm2 Co7, Nanocomposite Trilayers with Cr and Ti Additions

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Chinese Physics Letters 2009年第3期26卷 255-257页

作者： F. shahzad S. A. Siddiqi J. Zhou Advaaced Light Source Berkeley Lab University of California Berkeley CA 94720 USA Centre for Solid State Physics University of the Punjab Lahore-54590 Pakistan Department of Physics University of California Berkeley California 94720 USA

Trilayered Sm2Co7/Fe/Sm2Co7 spring exchange magnets are fabricated by dc magnetron sputtering on mgO substrates. Very thin layers （0.3-0.7 nm） of Cr and Ti are added at the interfaces of the two magnetic phases. The thickness of StucCo7 is kept at 20nm and Fe at 6nm while the thickness of Cr and Ti are varied as 0.3, 0.5, and 0.7nm. The base pressure of sputtering chamber is kept below 10^-7 Torr and Ar pressure at 3-8m Torr. The samples are characterized by x-ray diffraction （XRD） and SQUID magnetometer. We report improvement in exchange coupling of nonacomposite magnets by addition of thin layers of Cr at interfaces.

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Seed priming improves early seedling vigor, growth and productivity of spring maize

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Journal of Integrative Agriculture 2015年第9期14卷 1745-1754页

作者： Hafeez ur Rehman Hassan Iqbal shahzad m A Basra Irfan Afzal muhammad Farooq Abdul Wakeel WANG Ning Seed Physiology Laboratory Department of Crop PhysiologyUniversity of Agriculture Department of Agronomy University of Agriculture Institute of Soil and Environmental Sciences University of Agriculture Agricultural Information Institute Chinese Academy of Agricultural Sciences

Potential of seed priming treatments in improving the performance of early planted maize was evaluated against timely planting. Seeds of maize hybrid FH-810 were soaked in water (hydropriming), CaCl2 (2.2%, osmopriming), moringa leaf extracts (mLE 3.3%, osmopriming) and salicylic acid (SA, 50 mg L–1, hormonal priming) each for 18 h. Untreated and hydroprimed seeds were taken as control. Seeds primed with SA took less time in emergence and had high vigor in early planted maize. Amongst treatments, hormonal priming, reduced the electrical conductivity, increased the leaf relative and chlorophyl contents fol owed by osmopriming with CaCl2 at seedling stage. Likewise, plant height, grain rows and 1 000-grain weight, grain and biological yield and harvest index were also improved by seed priming;however hormonal priming and osmopriming with mLE were more effective in this regard. Improved yield performance by hormonal priming or osmopriming with mLE in early planting primarily owed to increased leaf area index, crop growth and net assimilation rates, and maintenance of green leaf area at maturity. In conclusion, osmopriming with mLE and hormonal priming with SA were the most economical treatments in improving productivity of early planted spring maize through stimulation of early seedling growth at low temperature.

关键词： low temperature membrane permeability organic stimulants moringa leaf extracts salicylic acid leaf area duration yield

mass Transfer： a Deciding Factor for the multiplicity of an Event in Deep Inelastic Collisions

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Chinese Physics Letters 2006年第10期23卷 2714-2716页

作者： Tabassum Nasir J.J.Baluch E.U.Khan F.N.Khattak m.I.shahzad Department of Physics Gomal University D.I. Khan Pakistan Department of Physics CIIT Islamabad Pakistan U.W.C. Gomal UniversityD.I.KhanPakistan physics Research Division PINSTECH Islamabad Pakistan

Intermediate stage of the three and four-pronged events is investigated in the reaction ^208Pb＋^197Au at beam energy 11.67 meV/u. multiprong events are analysed numerically using an empirical mass-dependent velocityrauge relation. Using the measured three-dimensional coordinates of correlated tracks, it is possible to determine the quantities such as mass transfer and total kinetic energy loss. These quantities are then used to study the intermediate stage of the reaction. It has been observed that mass transfer and total kinetic energy loss at the first step of the reaction decides the multiplicity of an event at the second stage of the sequential fission process.

关键词： HEAVY-ION INTERACTION mICA TRACK DETECTORS CHANNELS FISSION U-238

Range extension of four highland agamid lizards in Shimshal Pamir,Pakistan

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Journal of Arid Land 2012年第1期4卷 77-84页

作者： babar KHAN Waseem AHmED Abdukadir Ablimit Shamim FAKHRI Hassan ALI Pakistan Wildlife Foundation Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences World Wide Fund for Nature Pakistan Zoological Survey Department

As part of the Sino-Pak trans-boundary cooperation for conservation and sustainable development in Pamir border region, World Wild Fund （WWF）-Pakistan conducted a preliminary social, economic and ecological survey in the ShimshaI-Pamir Lakes area in July 2009. The purpose of the study was to explore potentials and opportunities for future collaborative conservation of some species, habitats and high altitude ecosystems in the border region between China and Pakistan. The two-week herpetological study in the Shimshal Pamir area of Khunjerab National Park （KNP） along Pakistan-China border was an integral part of the survey, conducted exclu- sively to document reptilian fauna with a special emphasis on investigating their occurrence, distribution and status in the study area. Field investigations were performed during daytime when it was hot enough and reptiles were active, basking or feeding. A total of 15 specimens belonging to four species of the Agamidae family were captured by striking stones and beating bushes with sticks. Collected specimens were preserved using 10% formalin solution, tagged with field information and stored in Zoological Survey Department, Karachi for future reference. Laboratory investigations were carried out for pholidosic counts and morphometric measurements. A detailed review of relevant literature, habitat characteristics and laboratory investigations revealed the occurrence of Laudakia himalayana, L. pakistanica, L. tuberculata and L. badakhshana at 4,082 m, 4,172 m, 4,005 m and 4,240 m asl, respectively, which are much higher altitudes as compared to the previously reported heights of 3,353 m, 3,200 m, 2,500 m and 2,400 m asl. The terrain offers a variety of ecological barriers, in the form of fast and freezing running waters and massive glaciers with peculiar harsh climatic conditions prevailing for nine months of the year, which restricts species migration and thus increases endemism. Although one of the four species recorded from the

关键词： Laudakia himalayana L. pakistanica L. tuberculat L. badakhshana Agarnidae Gilgit-Baltistan Khunjerab National Park Pakistan

RNA-seq reveals mechanisms of SlmX1 for enhanced carotenoids and terpenoids accumulation along with stress resistance in tomato

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Science Bulletin 2017年第7期62卷 476-485页

作者： mohamed Ewas Yangqiang Gao Farhan Ali Elsayed m. Nishawy Raheel shahzad Hizar Subthain mohamed Amar Cathie martin Jie Luo National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan) College of Life Sdence and Technology Huazhong Agricultural University Wuhan 430070 China Egyptian Deserts Gene Bank (EDGB) Genetic Resources Department Cairo Egypt Deserts Research Center (DRC) Cairo Egypt John lnnes Centre Norwich Research Park Colney Norwich NR4 7UH UK

Improving nutritional fruit quality and impacts important agro-traits such as biotic or abiotic stresses are extremely important for human *** previous study reported that manipulation of Sl mX1 gene enhanced carotenoids accumulation and drought resistance in ***,RNA-Seq analysis proved to be a very useful tool to provide insights into the regulatory mechanisms of Sl mX1 involved in stress resistance and enhanced secondary *** analysis showed that overexpression of Sl mX1 results in substantially increased broad-spectrum tolerance to a wide-range of abiotic and biotic(fungus,bacteria,virus and insects) stresses in *** research appears to be of remarkable interest because enhanced terpenoids content has been achieved by increasing trichome *** addition,we reported two types of trichome which seems to be aberrant types in *** study unravels the mechanism of regulation of Sl mX1,which simultaneously modulates resistance and metabolic processes through regulating key structural and regulatory genes of the corresponding pathways.

关键词： Tomato SlmX1 Resistance Carotenoids Terpenoids mechanism RNA Seq

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新冠病毒核衣壳蛋白及其在病毒感染中的作用

中国科学技术大学学报 2022年第6期52卷 1-10,I0002页

作者： H.m.Shifa ul Haq Arnaud JohnKOmBE KOmBE Ayesha Zahid momal babar 曾威红何宏亮金腾川中国科学技术大学附属第一医院妇产科中国科学技术大学生命科学与医学部安徽合肥230001 中国科学技术大学生命科学与医学部基础医学院结构免疫学实验室中国科学院天然免疫与慢性疾病重点实验室旁遮普大学应用分子生物学中心拉合尔53700巴基斯坦中国科学技术大学附属第一医院传染病科中国科学技术大学生命科学与医学部安徽合肥230001 中国科学院分子细胞科学卓越创新中心上海200031

新型冠状病毒感染引起的新冠肺炎传播已经导致了全世界数百万人的死亡。因此,深入了解新冠病毒的生物学基础对研发控制其传播的新手段至关重要。新冠病毒的核衣壳蛋白(N蛋白)是一个重要的诊断和治疗靶点,它在病毒生命周期中具有多种重... 详细信息

新型冠状病毒感染引起的新冠肺炎传播已经导致了全世界数百万人的死亡。因此,深入了解新冠病毒的生物学基础对研发控制其传播的新手段至关重要。新冠病毒的核衣壳蛋白(N蛋白)是一个重要的诊断和治疗靶点,它在病毒生命周期中具有多种重要功能。目前已有多个关于新冠病毒N蛋白的结构与功能方面的研究报道。本综述总结了这个进化上高度保守的N蛋白的最新数据,以期提供有关该蛋白的结构和多种功能特征的全面信息。

关键词：新型冠状病毒新冠肺炎核衣壳蛋白疫苗设计治疗靶点

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基于三线DFT的航空电源频率实时检测算法

电工技术学报 2012年第10期27卷 190-195,214页

作者：肖鲲王莉娜 m.Khurram shahzad 北京航空航天大学自动化科学与电气工程学院北京100191

针对航空变频电源的频率(360～800Hz)检测,提出了一种基于三线离散傅里叶变换(DFT)的实时检测算法。首先对采样序列加汉宁窗,通过DFT计算基波频率主瓣区域的离散谱线幅值,推导出基波频率与3条离散谱线幅值的数值关系。其次结合电力系统... 详细信息

针对航空变频电源的频率(360～800Hz)检测,提出了一种基于三线离散傅里叶变换(DFT)的实时检测算法。首先对采样序列加汉宁窗,通过DFT计算基波频率主瓣区域的离散谱线幅值,推导出基波频率与3条离散谱线幅值的数值关系。其次结合电力系统的基波和谐波特点,分析了该算法无主瓣频谱泄露的采样点数选择方法;采用旋转坐标法计算离散谱线幅值,使三线DFT计算量得以显著减小;通过迭代法估计频率初值,对航空电源宽范围连续变化值进行检测,克服栅栏效应。仿真和实验结果表明,该算法具有良好的实时性,阶跃响应好,稳态精度高。

关键词：频率检测离散傅里叶变换汉宁窗频谱分析