检索结果-南通市图书馆

Growth and optical properties of InxGa1-xP nanowires synthesized by selective-area epitaxy

在线全文

学校读者我要写书评

暂无评论

Nano Research 2017年第2期10卷 672-682页

作者： Alexander Berg Philippe Caroff naeem shahid Mark N. Lockrey Xiaoming Yuan Magnus T. Borgstrom Hark Hoe Tan Chennupati Jagadish Solid State Physics and NanoLund Lund University Box 118 SE-221 00 Lund Sweden Department of Electronic Materials Engineering Research School of Physics and Engineering The Australian National University Canberra ACT2601 Australia Australian National Fabrication Facility Research School of Physics and Engineering The Australian National University Canberra ACT 2601 Australia

Ternary III-V nanowires （NWs） cover a wide range of wavelengths in the solar spectrum and would greatly benefit from being synthesized as position-controlled arrays for improved vertical yield, reproducibility, and tunable optical absorption. Here, we report on successful selective-area epitaxy of metal-particle-free vertical InxGa1-xP NW arrays using metal-organic vapor phase epitaxy and detail their optical properties. A systematic growth study establishes the range of suitable growth parameters to obtain uniform NW growth over a large array. The optical properties of the NWs were characterized by room-temperature cathodoluminescence spectroscopy. Tunability of the emission wavelength from 870 nm to approximately 800 nm was achieved. Transmission electron microscopy and energy dispersive X-ray measurements performed on cross- section samples revealed a pure wurtzite crystal structure with very few stacking faults and a slight composition gradient along the NW growth axis.

关键词： nanowire InGaP selective-area epitaxy cathodoluminescence energy-dispersive X-ray spectroscopy

气候变化和社会经济驱动因素共同作用了黄土高原区的植被变绿

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2021年第12期66卷 1160-1163,M0003页

作者： shahid naeem 张永强张选泽田静 Sawaid Abbas 罗莉莉 Hadush Kidane Meresa Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Department of Land Surveying and Geo-Informatics the Hong Kong Polytechnic UniversityHong KongChina

我国在黄土高原区开展了大范围的退耕还林还草工程,植被大范围变绿.但气候因子和人类活动如何共同作用植被变化还鲜有报道.本文利用偏微分方法在黄土高原区294个县定量分解了6个驱动因子(3个气候因子包括降水、气温和太阳辐射,3个人类... 详细信息

我国在黄土高原区开展了大范围的退耕还林还草工程,植被大范围变绿.但气候因子和人类活动如何共同作用植被变化还鲜有报道.本文利用偏微分方法在黄土高原区294个县定量分解了6个驱动因子(3个气候因子包括降水、气温和太阳辐射,3个人类活动因子包括GDP,人口和家畜量)如何影响植被变化.结果显示,2000~2018年间在284个县植被指数出现了增加的趋势,主要是由于气候因子和人类活动共同影响造成的.6个驱动因子中降水在152个县为植被恢复的主导因子,揭示了气候变化、环境保护和经济刺激政策对区域植被恢复都起到了重要作用.本文对于如何定量分析人类活动和气候变化对植被恢复和区域可持续发展提供了一个理论解析框架.

关键词：经济刺激政策黄土高原区退耕还林还草工程气候变化环境保护区域可持续发展主导因子气候因子

Evaluating the Impact of Different Tillage Regimes and Nitrogen Levels on Yield and Yield Components of Maize (Zea mays L.)

在线全文

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2016年第6期7卷 789-797页

作者： Muhammad naeem shahid M. shahid Ibni Zamir Ihtisham-Ul Haq M. Kamran Khan Mazhar Hussain Usman Afzal M. Asim Ihtisham Ali Department of Agronomy University of Agriculture Faisalabad Pakistan

A field study to evaluate the impact of different tillage regimes and nitrogen levels on yield and yield components of maize (Zea mays L.), was conducted during autumn 2014 at Students Farm, Department of Agronomy, University of Agriculture, Faisalabad. The experiment was laid out in RCBD (Randomized Complete Block Design), with split plot arrangement having three replications. The experiment was comprised of three tillage regimes (Minimum, Conventional and Deep) and three nitrogen levels viz: 100, 200 and 300 kg•ha-1. Urea was used as a source of nitrogen, sulphate of potash as a source of potassium and triple super phosphate as a source of phosphorous. The amount of phosphorous and potash was constant in all the treatments i.e. 125 kg•ha-1 and 100 kg•ha-1 respectively. Results of present study are summarized as yield parameters are significantly affected by different nitrogen levels and tillage regimes. Maximum number of plants at harvest (7.93), number of grain rows per cob (17.70), number of grains per row (34.31), number of grains per cob (678.58), and cob weight (187.50 g) were observed in deep tillage at 200 kg•ha-1 nitrogen application. 1000-grain weight (275.52 g), biological yield (15.66 t•ha-1), grain yield (6.16 t•ha-1) and dried stalk yield (9.91 t•ha-1) were observed maximum in deep tillage at 200 kg•ha-1 nitrogen application. Harvest index significantly affected by tillage regimes and maximum harvest index (39.58%) were recorded in deep tillage which was statistically at par with conventional tillage (38.83%). It was concluded that higher grain yield of maize can be obtained by deep tillage with the application of 200 kg•ha-1 nitrogen application under the prevailing conditions of Faisalabad.

关键词： Tillage Regimes Nitrogen Levels Deep Tillage Biological Yield Harvest Index

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

全球生态系统服务与自然资本的价值估算

生态学杂志 1999年第2期18卷 70-78页

作者： Robert Costanza Ralph d'Arge Rudolf de Groot Stephen Farber Monica Grasso Bruce Hannon Karin Limburg shahid naeem Robert V.O'neill Jose Paruelo Robert G.Raskin Paul Sutton Marjan van den Belt 陶大立(译) 美国马里兰大学美国怀俄明大学荷兰瓦格宁根农业大学美国匹次堡大学美国伊利诺大学美国米尔布卢克生态系统研究所美国明尼苏达大学美国橡树岭国家实验室环境科学部阿根廷布依诺斯艾利斯大学美国加里福尼亚喷气推进实验室美国加州大学美国生态经济研究和应用公司不详

编者按：地球上的生态系统是一种复杂的生命支持系统，生态系统对人类的贡献，在生态学研究中经常用“社会效益和经济效益”来表述，是可以用经济价值来估算的。然而，由于其复杂性和不确定性，对这两个效益如何进行估价，一直是困扰生... 详细信息

编者按：地球上的生态系统是一种复杂的生命支持系统，生态系统对人类的贡献，在生态学研究中经常用“社会效益和经济效益”来表述，是可以用经济价值来估算的。然而，由于其复杂性和不确定性，对这两个效益如何进行估价，一直是困扰生态学家和经济学家的重要问题。Ｃｏｓ...

关键词：全球生态系统自然资本价值估算

Biological Synthesis of Nanoparticles and Their Applications in Sustainable Agriculture Production

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Natural Science 2022年第6期14卷 226-234页

作者： naeem Khan shahid Ali Sadia Latif Asif Mehmood Department of Agronomy Institute of Food and Agricultural Sciences University of Florida Gainesville FL USA College of Life Sciences and Oceangraphy Shenzhen University Shenzhen China Department of Biology and Environmental Science Allama Iqabal Open University Islamabad Pakistan Institute of Biological Sciences Sarhad University of Science and Information Technology Peshawar Pakistan

Nanotechnology is a developing field in biotechnology. The synthesis of nanoparticles is an important step in the field of nanotechnology. Overcoming the limitations of traditional methods, a green scheme for synthesizing nanoparticles has emerged. Plants and microorganisms are mainly used for the green synthesis of metal nanoparticles. Some of the nanoparticles showed strong antimicrobial effects against different plant pathogens. Compared with microorganisms, the use of plants to synthesize nanoparticles is on the rise, and has advantages compared with microorganisms, because plants have a wide range of bio-molecular variability, which can act as blocking/stabilizing agents and reducing agents, thereby increasing reduction rate and stability of synthetic nanoparticles. Of all living things, plants seem to have the best potential for nanoparticle biosynthesis and are suitable for large-scale biosynthesis. Compared with microorganisms, the synthesis of plant-derived nanoparticles is faster and more stable. Therefore, this review focuses on the use of microbial and plant sources to synthesize nanoparticles and their applications in agriculture.

关键词： Biosynthesis Nanoparticles Microbes Biomolecules

Role of Organic Amendments to Mitigate Cd Toxicity and Its Assimilation in Triticum aestivum L.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2022年第11期91卷 2491-2504页

作者： Tauqeer Ahmad Yasir Sobia Aslam Muhammad shahid Rizwan Allah Wasaya Muhammad Ateeq Muhammad naeem Khan Sikander Khan Tanveer Walid Soufan Basharat Ali Allah Ditta Arpna Kumari Ayman EL Sabagh College of Agriculture Bahauddin Zakariya UniversityBahadur Sub-Campus Layyah31200Pakistan Cholistan Institute of Desert Studies The Islamia University of BahawalpurBahawalpur63100Pakistan Directorate General Soil Survey of Punjab Agriculture DepartmentLahore54780Pakistan National Agricultural Research Centre Islamabad44000Pakistan Plant Production Department College of Food and Agriculture SciencesKing Saud UniversityRiyadh11451Saudi Arabia Department of Agricultural Engineering Khwaja Fareed University of Engineering and Information TechnologyRahim Yar Khan64200Pakistan School of Biological Sciences The University of Western AustraliaPerthWA 6009Australia Department of Environmental Sciences Shaheed Benazir Bhutto University SheringalDir(U)Khyber Pakhtunkhwa18000Pakistan Academy of Biology and Biotechnology Southern Federal UniversityRostov-on-Don344006Russia Department of Agronomy Faculty of AgricultureKafrelsheikh UniversityKafr El Sheikh33511Egypt

In soil biota,higher and enduring concentration of heavy metals like cadmium(Cd)is hazardous and associated with great loss in growth,yield,and quality parameters of most of the crop ***,in-situ applications of eco-friendly stabilizing agents in the form of organic modifications have been utilized to mitigate the adverse effects of *** controlled experiment was laid down to appraise the imprints of various applied organic amendments namely poultry manure(PM),farmyard manure(FYM),and sugarcane press mud(PS)to immobilize Cd in polluted ***,phytoavailability of Cd in wheat was also accessed under an alkaline *** revealed that the addition of FYM(5–10 ton ha^(-1))in Cd-contaminated soil significantly increased germination rate,leaf chlorophyll content,plant height,spike length,biological and grain yield amongst all applied organic ***,the addition of FYM(5–10 ton ha^(-1))also reduced the phytoavailability of Cd by 73–85%in the roots,57–83%in the shoots,and 81–90%in grains of wheat ***,it is affirmed that incorporation of FYM(5–10 ton ha^(-1))performed better to enhance wheat growth and yield by remediating ***,the application of FYM(5–10 ton ha^(-1))reduced the toxicity induced by Cd to plants by declining its uptake and translocation as compared to all other applied organic amendments to immobilize Cd under sandy alkaline polluted soil.

关键词： Cadmium toxicity mitigation chlorophyll attributes morphometry yield attributes cereal

Optimization of Steel Bar Manufacturing Process Using Six Sigma

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2016年第2期29卷 332-341页

作者： naeem Khawar ULLAH Misbah TARIQ Adnan MAQSOOD shahid AKHTAR Rehman NAWAZ Rashid HUSSAIN Iftikhar Department of Industrial Engineering University of Engineering and Technology(UET) Peshawar

Optimization of a manufacturing process results in higher productivity and reduced wastes. Production parameters of a local steel bar manufacturing industry of Pakistan is optimized by using six Sigma-Define, measure, analyze, improve, and controlmethodology. Production data is collected and analyzed. After analysis, experimental design result is used to identify significant factors affecting process performance. The significant factors are controlled to optimized level using two-level factorial design method. A regression model is developed that helps in the estimation of response under multi variable input values. Model is tested, verified, and validated by using industrial data collected at a local steel bar manufacturing industry of Peshawar（Khyber Pakhtunkhwa, Pakistan）. The sigma level of the manufacturing process is improved to 4.01 from 3.58. The novelty of the research is the identification of the significant factors along with the optimum levels that affects the process yield, and the methodology to optimize the steel bar manufacturing process.

关键词： steel bar manufacturing industry six sigma yield sigma level design of experiments

Synthesis, Crystal Structure and DNA Interaction Study of 3-(2-(3,5-Diphenyl-4,5-dihydropyrazol-1-yl)thiazol-4-yl)-2H-chromen-2-one

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2015年第7期34卷 1013-1018页

作者： MURTAZA Madni shahid Hameed MUHAMMAD naeem Ahmed KHAWAJA Ansar Yasin MUHAMMAD Nawaz Tahir Department of Chemistry Quaid-i-Azam University Department of Chemistry The University of Azad Jammu and Kashmir University of Sargodha Department of Physics

A new compound 3-（2-（3,5-diphenyl-4,5-dihydropyrazol-1-yl）thiazol-4-yl）-2Hchromen-2-one was synthesized by cyclocondensation of 3,5-diphenyl-4,5-dihydropyrazole-1-carbothioamide with 3-（2-bromoacetyl）-2H-chromen-2-one in ethanol at reflux for 2hrs. The compound was characterized by IR, 1H-NMR, 13C-NMR and single-crystal X-ray diffraction analysis. The newly synthesized compound（C27H19N3O2S） crystallizes in the triclinic system, space group P1 with a = 5.2476（6）, b = 18.289（2）, c = 23.115（3） , α = 93.546（7）, β = 94.715（6）, γ = 92.347（7）°, V = 2204.3（4）3, Z = 4, Mr = 449.51, crystal size = 0.38 mm × 0.22 mm × 0.16 mm,（I 2σ（I）） = 35317, 9736, 3785, Rint = 0.081,（Δρ）max = 0.19 and（Δρ）min = –0.24 e·-3. DNA interaction studies revealed that the target compound strongly interacts with DNA through an intercalation binding mode and the binding constant of the compound is 7.45 × 104 M-1.

关键词： binding constant DNA Interaction crystal structure cyclocondensation reaction 1 3-thiazole

Vibration characteristics of FGM circular cylindrical shells filled with fluid using wave propagation approach

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2009年第11期30卷 1393-1404页

作者： Zafar Iqbal Muhammad Nawaz naeem Nazra Sultana shahid Hussain Arshad Abdul Ghafar Shah Department of Mathematics University of Sargodha Department of Mathematics G. C. University Faisalabad Department of Mathematics University of Sargodha Department of Mathematics The Islamia University of Bahawalpur

The vibration characteristics of a functionally graded material circular cylindrical shell filled with fluid are examined with a wave propagation approach. The shell is filled with an incompressible non-viscous fluid. Axial modal dependence is approximated by exponential functions. A theoretical study of shell vibration frequencies is analyzed for simply supported-simply supported, clamped-simply supported, and clamped-clamped boundary conditions with the fluid effect. The validity and the accuracy of the present method are confirmed by comparing the present results with those available in the literature. Good agreement is observed between the two sets of results.

关键词： functionally graded material Love's shell theory cylindrical shell volumefraction law natural frequency wave propagation