检索结果-南通市图书馆

Correlation Analysis of Energy Consumption of Agricultural Rotorcraft

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第5期71卷 3179-3192页

作者： Lihua Zhu zhijian xu Yu Wang Cheire Cheng School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China Department of Electrical and Electronic Engineering Colorado State UniversityFort CollinsUSA

With the rapid development of unmanned aerial vehicle technology,unmanned aerial vehicles(UAVs)have been widely used in the field of agricultural plant *** with fuel-driven UAVs,electrically driven rotorcrafts have many advantages such as lower cost,simpler operation,good maneuverability and cleaner power,which them popular in the plant ***,electrical rotorcrafts still face battery problems in actual operation,which limits its working time and *** at this issue,this paper studied the influence of rotorcraft flight parameters on energy consumption through series of carefully designed flight *** of all,the linear motion experiments have been designed that the rotorcraft was made to perform speed tests and acceleration test with the speed varied from 2∼9 m/***,the turning maneuver experiments are carried out under the different circular routes,a rotorcraft was made to conduct successive steering maneuvers at a certain speed of 2 m/*** the collected tests data,the relation of the energy consumption and the flight dynamic parameter are analyzed through correlation analysis,and the test results of different pairs of experiments have been *** research results of this paper would encourage the agricultural rotorcraft to make less maneuvers during operation,which can also provide practical experience and data support for subsequent optimization of flight parameters and reduction of energy consumption.

关键词： Plant protection UAV energy consumption correlation analysis flight speed flight maneuver

D3Targets-2019-nCoV: a webserver for predicting drug targets and for multi-target and multi-site based virtual screening against COVID-19

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

Acta Pharmaceutica Sinica B 2020年第7期10卷 1239-1248页

作者： Yulong Shi Xinben Zhang Kaijie Mu Cheng Peng Zhengdan Zhu Xiaoyu Wang Yanqing Yang zhijian xu Weiliang Zhu CAS Key Laboratory of Receptor Research Drug Discovery and Design CenterShanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China School of Pharmacy University of Chinese Academy of SciencesBeijing 100049China Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215123China

A highly effective medicine is urgently required to cure coronavirus disease 2019(COVID-19).For the purpose,we developed a molecular docking based webserver,namely D3 Targets-2019-nCoV,with two functions,one is for predicting drug targets for drugs or active compounds observed from clinic or in vitro/in vivo studies,the other is for identifying lead compounds against potential drug targets via *** server has its unique features,(1)the potential target proteins and their different conformations involving in the whole process from virus infection to replication and release were included as many as possible;(2)all the potential ligand-binding sites with volume larger than 200 A^3 on a protein structure were identified for docking;(3)correlation information among some conformations or binding sites was annotated;(4)it is easy to be updated,and is accessible freely to public(https://www.d3 ***/D3 Targets-2019-nCoV/***).Currently,the webserver contains 42 proteins[20 severe acute respiratory syndrome-related coronavirus 2(SARS-CoV-2)encoded proteins and 22 human proteins involved in virus infection,replication and release]with 69 different conformations/structures and 557 potential ligand-binding pockets in *** 6 examples,we demonstrated that the webserver should be useful to medicinal chemists,pharmacologists and clinicians for efficiently discovering or developing effective drugs against the SARS-CoV-2 to cure COVID-19.

关键词： COVID-19 SARS-CoV-2 Target prediction Multi-conformation Multi-site Docking D3Targets-2019-nCoV

Partially crystallized Pd nanoparticles decorated TiO_2 prepared by atmospheric-pressure cold plasma and its enhanced photocatalytic performance

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2014年第6期23卷 679-683页

作者： zhijian xu Bin Qi Lanbo Di Xiuling Zhang College of Physical Science and Technology Dalian University Liaoning Key Laboratory of Bio-organic Chemistry Dalian University

TiO2 decorated with partially crystallized Pd nanoparticles （Pd/TiO2-P） was successfully prepared by atmospheric-pressure dielectric barrier discharge cold plasma. The XRD and XPS analyses proved that Pd ions were reduced to partially crystallized metallic Pd nanoparticles in Pd/TiO2-P. The XPS spectra also indicated that an enhanced metal-support interaction was formed due to the existence of partially crystallized Pd nanoparticles with lower coordination number in Pd/TiO2-P. Photocatalytic activity of Pd/TiO2-P was much higher than that of TiO2 samples decorated with well crystallized Pd nanoparticles.

关键词： Pd/TiO2 Pd with poor crystallinity photocatalysis atmospheric-pressure cold plasma dielectric barrier discharge

A IP_N×IP_N Spectral Element Projection Method for the Unsteady Incompressible Navier-Stokes Equations

在线全文

学校读者我要写书评

暂无评论

Numerical Mathematics(Theory,Methods and Applications) 2008年第3期1卷 275-296页

作者： zhijian Rong Chuanju xu School of Mathematical Sciences Xiamen University 361005 Xiamen China.Received 14 August 2007 Accepted （in revised version） 28 November 2007

In this paper,we present a IP_N×IP_N spectral element method and a detailed comparison with existing methods for the unsteady incompressible Navier-Stokes equa- *** main purpose of this work consists of:(i) detailed comparison and discussion of some recent developments of the temporal discretizations in the frame of spectral el- ement approaches in space;(ii) construction of a stable IP_N×IP_N method together with a IP_N→IP_(N-2) *** link of different methods will be *** key feature of our method lies in that only one grid is needed for both velocity and pressure variables,which differs from most well-known solvers for the Navier-Stokes equations. Although not yet proven by rigorous theoretical analysis,the stability and accuracy of this one-grid spectral method are demonstrated by a series of numerical experiments.

关键词： IPN ×IPN Navier-Stokes equations spectral element methods.

Facile Synthesis of 7-epi-Taxane and Its Derivatives and Preliminary Evaluation of Anticancer Activity

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2016年第11期34卷 1165-1176页

作者： Zhao Li Jia Feng Kun Zou Zhuo Yang Yong Zhang zhijian xu Bo Li Jiye Shi Yiming Li Weiliang Zhu Kaixian Chen School of Pharmacy Shanghai University of Traditional Chinese Medicine Shanghai 201203 China CAS Key Laboratory of Receptor Research Drug Discovery and Design Centre Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai 201203 China Nano Science and Technology Institute University of Science and Technology of China Suzhou Jiangsu 215123 China UCB Biopharma SPRL Chemin du Foriest Braine-l'Alleud Belgium Kellogg College University of Oxford 60-62 Banbury Road Oxford OX2 6PN United Kingdom

7-epi-Taxane has been achieved efficiently in gram scale from natural taxane via inversion of the 7-hydroxyl group simply using Ag20 as catalyst and DMF as solvent. The catalyst could he quantitatively recovered by filtra- tion without loss of catalytic activity. This condition is also applicable to the direct epimerization of taxane derivatives （e.g., docetaxel and paclitaxel） to 7-epi-taxane derivatives （e.g., 7-epi-docetaxel and 7-epi-paclitaxel）. Furthermore, 33 ester derivatives of 7-epi-taxane with different amino acid moieties at the position of C-13 were successfully synthesized via esterification without protecting C-7-OH. Bioassay results revealed that compounds 13 and 18 have good selectivity against prostatic cancer cell line DU145, with ICs0 value as low as 15.9 nmol/L for 18.

关键词： taxane 7-epi-taxane silver oxide amino acid C-13 derivative of taxane anticancer activity

A Thermodynamic Analysis on the Catalytic Combustion of Methane

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 Natural Gas Chemistry 2003年第4期12卷 237-242页

作者： Weicheng Liu, Yunpeng xu, zhijian Tian, Zhusheng xuDalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, China Dalian Institute of Chemical Physics The Chinese Academy of Sciences Dalian 116023 China

Chemical equilibria involving 10 species and adiabatic reaction temperatureof methane combustion in air under various conditions have been calculated in detail by means oftotal Gibbs energy minimization of the system. The calculation data show that the adiabaticcombustion temperature of CH_4 and air at stoichiometric ratio is up to about 2200 K, and theequilibrium concentration of NO is about 0.0018, however that of NO2 is only 1 x 10^(-6). A largeamount of carbon deposition emerges when the CH_4 concentration is above 26.5%. The NO and NO_2appear only when the CH_4 concentration is below 16%. The maximum equilibrium concentrations of NOand NO_2 are 0.0028 and 2 x 10^(-6) respectively, at about 8%CH_4 concentration. The NO and NO_4concentrations increase with the system temperature at a low CH_4 concentration. However, both ofthem can be decreased when CO_2 or steam is introduced into the system, which also decreases theadiabatic combustion temperature. The decrease in adiabatic temperature caused by CO_2 addition ismore appreciable than that caused by the addition of H_2O. Pressure does not have a notable effecton the system equilibrium at a low methane concentration.

关键词： methane natural gas combustion thermodynamics equilibrium

Study of automobile exhaust particles by spectromicroscopy

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2010年第5期21卷 261-265页

作者： YANG Chuanjun GUO Zhi ZHANG Xiangzhi WANG Yong xu zhijian ZHANG Lijuan TAI Renzhong BAO Liangman LI Xiaolin ZHANG Guilin LI Yan Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China

In this paper,automobile exhaust particles of Gol and Santana 3000 were studied by *** STXM results show that the single particulate is sized at 500 nm,with the mass distribution reducing towards the *** N 1s NEXAFS spectra of automobile exhaust particles have similar structure with those of nitrates,which can be deduced as the main chemical species of nitrogen in automobile exhaust *** are minor amounts of ammoniums and organic nitrogen compounds in automobile exhaust particles.A single Gol automobile exhaust particle was stack scanned in the energy range of 396-416 *** principal component analysis and cluster analysis,it can be deduced that there are main three chemical species of *** particle surface consists of mainly nitrates,the inside consists of mainly ammonium and organic nitrogen compounds,and the middle layer is an intergradation consisting of mainly nitrates and organic nitrogen compounds.

关键词：汽车废气有机氮化合物桑塔纳3000 汽车尾气粒子化学物质单颗粒主成分分析

SARS-CoV-2 Omicron RBD shows weaker binding affinity than the currently dominant Delta variant to human ACE2

在线全文

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2022年第2期7卷 359-361页

作者： Leyun Wu Liping Zhou Mengxia Mo Tingting Liu Chengkun Wu Chunye Gong Kai Lu Likun Gong Weiliang Zhu zhijian xu CAS Key Laboratory of Receptor Research Drug Discovery and Design CenterShanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China College of Computer Science and Technology National University of Defense TechnologyChangsha 410073China Center for Drug Safety Evaluation and Research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China

Dear Editor,SARS-coronavirus-2(SARS-CoV-2)Omicron variant(B.1.1.529)is of great concern to the world due to its multiple mutations that may have an impact on transmissibility and immune evasion.1 Compared to the wild type(WT),Omicron carries as many as 30 single point mutations,3 deletion mutation and one insertion mutation on its spike ***,there are 15 mutations observed in the Omicron receptor-binding domain(RBD),10 of which are in the receptor-binding motif(RBM)that human angiotensin-converting enzyme 2(ACE2)and most monoclonal antibodies(mAbs)interact directly *** a comparison,the currently dominant variant Delta(B.1.617.2)has only 2 mutations(L452R and T478K)in its RBM and additional K417N and E484K mutations ***,Omicron variant may significantly impact the binding affinity to ACE2 and effectiveness of currently available ***,Omicron mutant has aroused wide concern,many countries have taken measures on entry restrictions to prevent its rapid ***,the transmissibility and immune evasion risk of Omicron have not been properly evaluated.

关键词： ACE2 Delta properly

Synthesis and photocatalytic activity of sulfate modified Nd-doped TiO_2 under visible light irradiation

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 Rare Earths 2015年第5期33卷 491-497页

作者：孙东峰王凯徐志坚李锐星 Key Laboratory of Aerospace Materials and Performance (Ministry of Education) School of Materials Science and Engineering Beihang University College of Physical Science and Technology Dalian University

Nd-doped TiO2 （NT） photocatalysts with different contents of Nd were synthesized by sol-gel method. Then sulfated Nd-doped TiO2 （SNT） solid superacid photocatalysts were prepared by an incipient wetness impregnation technique. The photocata-lytic activity of catalysts was evaluated by the photodegradation of methylene blue under visible light irradiation. Analytical results demonstrated that Nd doping inhibited the growth of TiO2 crystallite and enhanced the thermal stability of anatase TiO2. Meanwhile, sulfate ions modification increased the specific surface area of samples. In addition, the optical absorption edges of SNT photocata-lysts shifted to longer wavelength compared with the undoped TiO2. Such SNT with Nd dosage of 0.25 at.%exhibited the highest photocatalytic activity in the degradation of methylene blue upon irradiation with visible light.

关键词： TiO2 solid superacid photocatalyst visible light methylene blue rare earths