检索结果-南通市图书馆

Application of Multimedia and Internet Technology in Learning Mould Design

在线全文

学校读者我要写书评

暂无评论

厦门大学学报（自然科学版） 2002年第S1期41卷 295-296页

作者： simon S p Shum Department of Multimedia and Internet Technology

With the use of multimedia which combines the use o f text, sound, images, motion video and animation, it is more efficient for studen ts to learn mould design interactively. A program is created using several multi media software to simulate the mechanism of moulding processes in order to let s tudents understand the concept of mould design. In addition, students can even access the program through the Internet. Therefore, the software is defined as Multimedia and Internet Technology (MIT) program. The MIT program consists of four sections: (i) simulation of mould mechanisms, ( ii) cooling system, (iii) material information and (iv) games for tutorials. Sec tion One covers the basic operations of different types of moulds such as two-p late mould, three-plate mould, split mould, side-core mould and mould with und ercuts. Section Two introduces different types of cooling systems such as bubble r, baffle, cooling circuits, etc. Section Three provides some useful material in formation for mould design. Section Four contains games of matching mould compon ents, mould design problem finding and multiple choice questions to test student s how much they understand mould design concept. Multimedia is highly effective particularly in teaching and learning. It changes the nature of learning itself. It makes reading dynamic by giving words an impo rtant new dimension. It allows students to see, hear and do simultaneously, thus significantly reducing average learning time. Furthermore, through cooperative learning on Internet, students can access the program, share data or search info rmation anytime anywhere. Therefore, Multimedia and Internet Technology is one o f the vital aspects to speed up the realization of information age in society.

关键词： Application of Multimedia and Internet Technology in Learning Mould Design

Identification of Differentially Senescing Mutants of Wheat and Impacts on Yield,Biomass and Nitrogen partitioning

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative plant Biology 2012年第8期54卷 555-566页

作者： Adinda p.Derkx simon Orford simon Griffiths M.John Foulkes Malcolm J. Hawkesford plant Biology and Crop Science Department Rothamsted ResearchHarpendenHertfordshireAL5 2JQUK Division of plant&Crop Sciences School of BiosciencesUniversity of NottinghamSutton Bonington CampusNr LoughboroughLE12 5RDUK John Innes Centre Norwich Research ParkColneyNorwich NR4 7UHUK

Increasing photosynthetic capacity by extending canopy longevity during grain filling using slow senescing stay-green genotypes is a possible means to improve yield in wheat. Ethyl methanesulfonate （EMS） mutated wheat lines （Triticum aestivum L. cv. paragon） were screened for fast and slow canopy senescence to investigate the impact on yield and nitrogen partitioning. Stay-green and fast-senescing lines with similar anthesis dates were characterised in detail. Delayed senescence was only apparent at higher nitrogen supply with low nitrogen supply enhancing the rate of senescence in all lines. In the stay-green line 3 （SG3）, on a whole plant basis, tiller and seed number increased whilst thousand grain weight （TGW） decreased; although a greater N uptake was observed in the main tiller, yield was not affected. In fast-senescing line 2 （FS2）, yield decreased, principally as a result of decreased TGW. Analysis of N-partitioning in the main stem indicated that although the slow-senescing line had lower biomass and consequently less nitrogen in all plant parts, the proportion of biomass and nitrogen in the flag leaf was greater at anthesis compared to the other lines; this contributed to the grain N and yield of the slow-senescing line at maturity in both the main tiller and in the whole plant. A field trial confirmed senescence patterns of the two lines, and the negative impact on yield for FS2 and a positive impact for SG3 at low N only. The lack of increased yield in the slow-senescing line was likely due to decreased biomass and additionally a possible sink limitation.

关键词： Wheat senescence stay-green grain-filling yield nitrogen.

Quantification of hookworm ova from wastewater matrices using quantitative pCR

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第7期29卷 231-237页

作者： pradip Gyawali Warish Ahmed Jatinder p.Sidhu paul Jagals simon Toze CSIRO Land and Water Ecosciences Precinct School of public Health The University of Queensland

A quantitative pCR（q pCR） assay was used to quantify Ancylostoma caninum ova in wastewater and sludge *** estimated the average gene copy numbers for a single ovum using a mixed population of *** average gene copy numbers derived from the mixed population were used to estimate numbers of hookworm ova in *** seeded and unseeded wastewater and sludge *** newly developed qp CR assay estimated an average of3.7 × 10~3 gene copies per ovum,which was then validated by seeding known numbers of hookworm ova into treated *** qp CR estimated an average of（1.1 ± 0.1）,（8.6 ± 2.9）and（67.3 ± 10.4） ova for treated wastewater that was seeded with（1 ± 0）,（10 ± 2） and（100 ± 21）ova,*** further application of the q pCR assay for the quantification of *** ova was determined by seeding a known numbers of ova into the wastewater *** qp CR results indicated that 50%,90% and 67% of treated wastewater（1 L）,raw wastewater（1 L）and sludge（~4 g） samples had variable numbers of *** gene *** conversion of the q pCR estimated gene copy numbers to ova for treated wastewater,raw wastewater,and sludge samples,had an average of 0.02,1.24 and 67 ova,*** result of this study indicated that qp CR can be used for the quantification of hookworm ova from wastewater and sludge samples;however,caution is advised in interpreting qp CR generated data for health risk assessment.

关键词： Wastewater matrices Quantitative pCR Hookworm ova Health risks

Design of face-hobbed spiral bevel gears with reduced maximum tooth contact pressure and transmission errors

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2013年第3期26卷 777-790页

作者： Vilmos simon Budapest University of Technology and Economics Faculty of Mechanical Engineering Department for Machine Design

The aim of this study is to define optimal tooth modifications, introduced by appropriately chosen head-cutter geometry and machine tool setting, to simultaneously minimize tooth contact pressure and angular displacement error of the driven gear （transmission error） of face-hobbed spiral bevel gears. As a result of these modifications, the gear pair becomes mismatched, and a point contact replaces the theoretical line contact. In the applied loaded tooth contact analysis it is assumed that the point contact under load is spreading over a surface along the whole or part of the ‘‘potential’’ contact line. A computer program was developed to implement the formulation provided above. By using this program the influence of tooth modifications introduced by the variation in machine tool settings and in head cutter data on load and pressure distributions, transmission errors, and fillet stresses is investigated and discussed. The correlation between the ease-off obtained by pinion tooth modifications and the corresponding tooth contact pressure distribution is investigated and the obtained results are presented.

关键词： Ease-off Face-hobbed spiral bevel gears Load distribution Transmission errors Gear teeth

Looking into the future of Nanoelectronics in the Diversification Efficient Era

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2016年第6期59卷 6-19页

作者： simon DELEONIBUS Universit′es Grenoble Alpes CEA LETIMINATEC Campus

The linear scaling of CMOS has encountered, since its beginning, many hurdles which request new process modules, driven mainly by the maximization of energy efficiency. Fabrication at the sub 10 nm node level will request Intrinsic Variability approaching to zero. The rapid growth of mobile, multifunctional and autonomous systems is hardly demanding to reach Zero power consumption. The solutions to integrate Thin Film based devices, architectures and systems in order to face these challenges are described.

关键词： CMOS thin films heterogeneous integration NEMS 3D integration sequential parallel zero intrinsic variability zero power systems

Optimal harvesting for a single-species population governed by Gompertz law:Influence of environmental fluctuation and limited harvesting capacity

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2019年第2期12卷 115-142页

作者： p.D.N.Srinivasu simon D.Zawka Sri Sathya Sai University for Human Excellence Navanihala Village Okali PostKamalapur Taluk Gulbarga DistrictKarnataka 585313India Department of Mathematics Andhra University Visakhapatnam 530003India Department of Mathematics Ar ba Minch University Arba MinchEthiopia

This work presents an optimal harvesting problem associated with a single-species population governed by Gompertz law in a seasonally fluctuating *** influence of environmental fluctuation is accommodated by choosing the coefficients in the differential equation to be periodic functions with the same period and restriction on the harvesting effort is accommodated by considering binding constraints on the control ***,a linear optimal control problem has been considered where the state dynamics is governed by Gompertz equation and the control variable is subject to the binding *** the help of maximum principle and the concept of blocked intervals,an optimal periodic solution has been obtained which is followed by the construe tion of optimal solution using the theory of most rapid *** results of the study are demonstrated through numerical simulations.

关键词： Optimal harvesting Gompertz equation seasonality binding constraint blocked intervals

Electrode-induced impurities in tin halide perovskite solar cell material CsSnBr_(3) from first principles

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2021年第1期7卷 555-563页

作者： Yuhang Liang Xiangyuan Cui Feng Li Catherine Stampfl simon p.Ringer Rongkun Zheng School of physics The University of SydneyNew South Wales 2006Australia School of Aerospace Mechanical and Mechatronic EngineeringThe University of SydneyNew South Wales 2006Australia

All-inorganic lead-free CsSnBr_(3)is attractive for applications in solar cells due to its nontoxicity and stability,but the device performance to date has been *** the intrinsic properties,impurities induced from electrodes may significantly influence the device ***,we systematically studied the stability,transition energy levels,and diffusion of impurities from the most commonly used electrodes(Au,Ag,Cu,graphite,and graphene)in CsSnBr_(3)based on density functional theory *** results reveal that,whereas graphite and graphene electrodes exhibit negligible influence on CsSnBr_(3)due to the relatively high formation energies for carbon impurities in CsSnBr_(3),atoms from the metal electrodes can effectively diffuse into CsSnBr_(3)along interstice and form electrically active impurities in CsSnBr_(3).In this case,a significant amount of donor interstitial impurities,such as Agti,Cuti,and Auti,will be formed under p-type conditions,whereas the Sn-site substitutional acceptor impurities,namely Au_(Sn)^(2-),Ag_(Sn)^(2-),and Cu_(Sn)^(2-),are the dominant impurities,especially under n-type *** particular,except for Auti,all these major impurities from the metal electrodes act as nonradiative recombination centers in CsSnBr_(3)and significantly degrade the device *** work highlights the distinct behaviors of the electrode impurities in CsSnBr_(3)and their influence on the related devices and provides valuable information for identifying suitable electrodes for optoelectronic applications.

关键词： stability perovskite halide

Effect of different surface treatments on bioactivity of porous titanium implants

维普期刊数据库评论

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 Materials Science & Technology 2019年第3期35卷 418-426页

作者： M.Todea A.Vulpoi C.popa p.Berce S.simon Institute of Interdisciplinary Research in Bio-Nano-Sciences Babes Bolyai University Department of Molecular Sciences Faculty of Medicine Iuliu Hatieganu University of Medicine and Pharmacy Technical University of Cluj-Napoca Faculty of Materials Science and Engineering Department of Materials Science and Technology Technical University of Cluj-Napoca Faculty of Machine Building & National Centre of Rapid Prototyping

The work aims to characterize the structure and to evaluate in vitro the effect of different surface treatments on the bioactivity of medical grade Ti6Al7 Nb alloy implants manufactured by selective laser melting. In order to improve the bioactivity of these samples, they were subjected to heat treatment,chemical treatment, and impregnation with bioactive materials. To evaluate the apatite forming ability, the samples were immersed in simulated body fluid solution) and characterized before and after immersion by scanning electron microscopy, X-ray diffraction and X-ray photoelectron *** composition and the texture of the surfaces after the applied treatments have a selective effect on apatite layer development on the surface of samples.

关键词： Ti6Al7Nb alloy Laser processing Composite materials Surface properties Bioactivity

Some remarks and problems on complex homogeneous domains Dedicated to professor Sheng GONG on the occasion of his 75th birthday

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2006年第11期49卷 1655-1661页

作者： GINDIKIN simon Department of Mathematics Hill Center Rutgers University110 Frelinghysen RoadPiscatawayNJ 088548019USA

We discuss some problems on rigidity of canonical realizations of complex homogeneous domains at Cn

关键词： complex homogeneous domain, Siegel domain, Cartan domain, homogeneous cone, tube domain, Cauchy kernel.