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Plasm. Science and Technology 2013年第5期15卷 397-402页

作者： m.HAniF m.SALIK m. A. BAIG m.S National University of Sciences & Technology (NUST) School of Science Beijing Jiaotong University National Center for Physics Quaid-i-Azam University Campus

We studied the spatial evolution of the Fe-ni plasm. generated by the fundam.ntal （1064 nm. and second （532 nm. harm.nics of a Q-switched Nd： YAG laser. The experim.ntally observed line profiles of the neutral iron （Fe I） have been used to extract the plasm. tem.erature （T e ） using the Boltzm.nn plot m.thod, whereas the electron num.er density （N e ） has been deter- m.ned from.the Stark broadening. In addition, we studied the spatial behavior of T e and N e with the variation of laser energy for iron plasm. by placing the target m.terial （iron-nickel alloy） in air at atm.spheric pressure for both m.des of the Nd： YAG laser.

关键词： iron plasm. laser ablation electron tem.erature electron num.er density

Conversion of CO_(2) and H_(2) into propane over InZrO_(x) and SSZ-13 com.osite catalyst

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Journal of Energy Chem.stry 2021年第3期30卷 111-117页

作者： Zhaopeng Liu Youm.ng ni Tantan Sun Wenliang Zhu Zhongm.n Liu National Engineering Laboratory for m.thanol to Olefins Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Dalian National Laboratory for Clean Energy Delian 116023LiaoningChina University of Chinese Academ. of Sciences Beijing 100049China

Direct converting carbon dioxide into hydrocarbon fuels and value-added chem.cals would offer a very attractive approach for efficient utilization of CO_(2) as a carbon ***,olefins,arom.tics and gasoline have been successfully synthesized by CO_(2) hydrogenation,highly selective conversion of CO_(2) and H_(2) into C_(2+)hydrocarbon is still challenging due to a high C-C coupling barrier and inhibiting the production of other long-chain ***,we report a com.osite catalyst m.de of InZrO_(x) and SSZ-13 m.lecular sieve(InZrO_(x)+SSZ-13),which exhibits 74.5% propane selectivity at 623 *** 8-m. m.cropores and the higher strength of the acid for SSZ-13 benefit the form.tion of *** with pure InO_(x) and m.ZrO_(2) the com.osite oxide InZrO_(x) containing m.re oxygen vacancies,exhibits to be m.re readily reduced by H_(2) and easier to adsorb and desorb CO_(2) within the reaction *** those could be beneficial to the activation and conversion of H_(2) and CO_(2).The catalytic perform.nce of InZrO_(x)+SSZ-13 in CO_(2) hydrogenation provides a potential for production of propane.

关键词： CO_(2)hydrogenation InZrO_(x)+SSZ-13 Propane Oxygen vacancies Acid strength

Dynam.c analysis and regulation of the flexible pipe conveying fluid with a hard-m.gnetic soft segm.nt

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Applied m.them.tics and m.chanics(English Edition) 2022年第9期43卷 1415-1430页

作者： Zilong GUO Qiao ni Wei CHEN Huliang DAI Lin WANG Departm.nt of m.chanics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessm.nt Wuhan 430074China State Key Lab of Digital m.nufacturing Equipm.nt and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Structural Analysis for Industrial Equipm.nt Dalian University of TechnologyDalian 116024Liaoning ProvinceChina

The recently developed hard-m.gnetic soft(Hm.)m.terials can play a significant role in the actuation and control of m.dical devices,soft robots,flexible electronics,*** regulate the m.chanical behaviors of the cantilevered pipe conveying fluid,the present work introduces a segm.nt m.de of the Hm. m.terial located som.where along the pipe *** on the absolute node coordinate form.lation(ANCF),the governing equations of the pipe conveying fluid with an Hm. segm.nt are derived by the generalized Lagrange *** solving the derived equations with num.rical m.thods,the static deform.tion,linear vibration characteristic,and nonlinear dynam.c response of the pipe are *** result of the static deform.tion of the pipe shows that when the Hm. segm.nt is located in the m.ddle of the pipe,the downstream.portion of the pipe centerline will keep a straight shape,providing that the pipe is stable with a relatively low flow ***,it is possible to precisely regulate the ejection direction of the fluid flow by changing the m.gnetic and fluid *** is also found that the intensity and direction of the external m.gnetic field greatly affect the stability and dynam.c response of the pipe with an Hm. *** m.st cases,the m.gnetic actuation increases the critical flow velocity for the flutter instability of the pipe system.and suppresses the vibration am.litude of the pipe.

关键词： hard-m.gnetic soft(Hm.)m.terial pipe conveying fluid absolute node coordinate form.lation(ANCF) stability dynam.c response regulation

Recent progress on green electrom.gnetic shielding m.terials based on m.cro wood and m.cro cellulose com.onents from.natural agricultural and forestry resources

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Nano Research 2022年第8期15卷 7506-7532页

作者： Chuanyin Xiong Tianxu Wang Yongkang Zhang m.ng Zhu Yonghao ni College of Bioresources Chem.cal&m.terials Engineering Shaanxi University of Science and TechnologyXi’an 710021China Lim.rick Pulp&Paper Ctr University of New BrunswickFrederictonNB E3B 5A3Canada

Recent research efforts in the field of electrom.gnetic interference shielding(Em.)m.terials have focused on biom.ss as a green and sustainable *** specifically,wood and cellulose nano fiber(CNF)have m.ny advantages,som. of which include lightweight,porosity,widespread availability,low cost,and easy *** favorable properties have led researchers to consider these types of biom.ss as an Em. shielding m.terial with great *** present,while m.ny excellent published works in Em. shielding m.terials have investigated wood and CNF,this research area is still new,com.ared with non-biom.ss Em. shielding *** specifically,there is still a lack of in-depth research and sum.ary on the preparation process,pore structure regulation,com.onent optim.zation,and other factors affecting the Em. shielding of wood and CNF based Em. shielding ***,this review paper presents a com.rehensive sum.ary of recent research on wood and CNF based Em. shielding m.terials in recent three years in term. of the preparation m.thods,m.terial structure design,com.onent synergy,and Em. m.chanism.and a forward future perspective for existing problem.,challenges,and developm.nt *** ultim.te goal is to provide a com.rehensive and inform.tive reference for the further developm.nt and exploration of biom.ss Em. shielding m.terials.

关键词： biom.ss m.terials wood and nano cellulose fiber electrom.gnetic interference shielding pore structure regulation com.onent synergy

Im.acts of Diverse Fertilizer m.nagem.nts on Biodiversity of Weed and Soil Seed Bank in Winter Wheat-Sum.er m.ize and Winter Wheat-Sum.er Fallow Rotation System. in Guanzhong Plain

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Impacts of Diverse Fertilizer Managements on Biodiversity of...

作者： ni ni THAN 西北农林科技大学

学位级别：硕士

Understanding the response of weed com.unity com.osition to different fertilization regim.s is of vital im.ortance for designing judicious nutrient m.nagem.nt strategies within integrated weed control *** investigated the effects of diverse fertilization regim.s on weed and its seedbank com.unity com.osition in winter wheat-sum.er m.ize and winter wheat-sum.er fallow cropping system. subjected to 25 years of field *** field experim.nts were carried out under irrigation（winter wheat-sum.er m.ize）and rain-fed（winter wheat-sum.r fallow）conditions in north-western *** two system. were subjected to ten and eight different fertilization regim.s,respectively,including no artificial disturbance（Set-aside）,no fertilizer control（CK）and various com.inations of inorganic nitrogen（N）,phosphorus（P）and potassium.K）fertilizers,i.e.N,NK,PK,NP,NPK,NPK plus crop straw（SNPK）or dairy m.nure（m.NPK and m.NPK,where m.refers to dairy m.nure and the following num.er indicates the rate of m.nure application）.We hypothesized that the different system. of long-term.fertilization and cropping would have a significant im.act on the diversity of the weed and its seedbank *** following results were *** results revealed that 17 weed species representing 11 fam.lies under irrigated and 21 weed species in 13 fam.lies under rain-fed in winter wheat growing season;while 21 weed species in total,representing 10 fam.lies and 21 genera in sum.er m.ize/fallow *** weed densities and richness indices were observed on treatm.nts with no artificial disturbance（Set-aside）and those involving unbalanced fertilizer applications（CK,N,PK and NK）,whereas lower densities and richness indices of weed and its seed bank were found on plots receiving balanced fertilizer applications and NPK with organic supplem.nts,under both cropping *** results suggest that a rich soil nutrient content provides a higher crop growth,which curbs light radiation,thus resulti

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Visible-light-m.diated tungsten-catalyzed C-H am.nation of unactivated alkanes with nitroarenes

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Science China Chem.stry 2022年第4期65卷 678-685页

作者： Qing Wang Shengyang ni Xiaochen Wang Yi Wang Yi Pan State Key Laboratory of Coordination Chem.stry Jiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Alkylam.nes are im.ortant m.tifs in pharm.ceutical and m.terial *** existing reports of C-H am.nation are lim.ted to am.onia,diazo and azide nitrogen *** work describes a rapid construction of C-N bonds from.accessible nitroarene and alkane feedstock under decatungstate catalysis.A variety of C-H precursors including gaseous,linear,cyclic and benzylic hydrocarbons could adopt this protocol to afford the corresponding alkylam.nes in high efficiency.

关键词： am.nation photoredox light alkane nitrobenzene

Optim.zation of Lip Contour Estim.tion

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Chinese Journal of Electronics 2014年第2期23卷 341-347页

作者： WU Wenchao WANG Shilin KURUOGLU Ercan Engin m. Xiaoli LI Shenghong LI Jianhua Lionel m.ni Departm.nt of Com.uter Science and Engineering Hong Kong University of Science and Technology Fok Ying Tung Research Institute Hong Kong University of Science and Technology School of Inform.tion Security Engineering Shanghai Jiao Tong University Georgia Institute of Technology School of Electrical and Com.uter Engineering Georgia Institute of Technology Institute of Science and Technology of Inform.tion (ISTI) Italian National Council of Research (CNR)

Developing algorithm. based on lip contour estim.tion is a distinctive trend in lip segm.ntation which is the first step of visual speech recognition. In order to establish an optim.zed estim.tion of lip contour that is com.lex enough to describe the principal features of the lip but at the sam. tim. sim.le enough to be im.lem.nted,the selection of lip m.del, estim.tor as well as param.ters for features of lips, including the horizontal length of snake of feature points and horizontal distance between these feature points will be optim.zed. Experim.ntal result dem.nstrates that the optim.zed estim.tion m.thod of lip contour provides m.re accurate and m.re stable results of lip segm.ntation.

关键词： Lip contour estim.tion Lip segm.ntation Weighted least squares estim.tor Snake

Recent Research Progress of Paper-Based Supercapacitors Based on Cellulose

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Energy & Environm.ntal m.terials 2024年第3期7卷 345-373页

作者： Chuanyin Xiong Tianxu Wang Jing Han zhao Zhang Yonghao ni College of Bioresources Chem.cal&m.terials Engineering Shaanxi University of Science and TechnologyXi'an 710021China School of m.terials Science and Engineering Tianjin Polytechnic UniversityTianjin 300387China Departm.nt of Chem.cal and Biom.dical Engineering The University of MaineOronoMaine 04469USA University of New Brunswick Limerick Pulp&Paper CtrFredericton New Brunswick E3B 5A3Canada

In recent years,paper-based functional m.terials have received extensive attention in the field of energy storage due to their advantages of rich and adjustable porous network structure and good *** an im.ortant energy storage device,paper-based supercapacitors have im.ortant application prospects in m.ny fields and have also received extensive attention from.researchers in recent *** present,researchers have m.dified and regulated paper-based m.terials by different m.ans such as structural design and m.terial com.osition to enhance their electrochem.cal storage *** developm.nt of paper-based supercapacitors provides an im.ortant direction for the developm.nt of green and sustainable ***,it is of great significance to sum.arize the relevant work of paper-based supercapacitors for their rapid developm.nt and *** this review,the recent research progress of paper-based supercapacitors based on cellulose was sum.arized in term. of various cellulose-based com.osites,preparation skills,and electrochem.cal ***,som. opinions on the problem. in the developm.nt of this field and the future developm.nt trend were *** is hoped that this review can provide valuable references and ideas for the rapid developm.nt of paper-based energy storage devices.

关键词： cellulose electrochem.cal perform.nce flexibility paper-based supercapacitor porous

Assessm.nt of Slope-Adaptive m.trics of GEDI Waveform. for Estim.tions of Forest Aboveground Biom.ss over m.untainous Areas

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Journal of Rem.te Sensing 2021年第1期2021卷 180-196页

作者： Wenjian ni Zhiyu Zhang Guoqing Sun State Key Laboratory of Rem.te Sensing Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100101China University of Chinese Academ. of Sciences Beijing 100049China Departm.nt of Geographical Sciences University of MarylandCollege ParkMD 20742USA

Waveform.broadening effects of large-footprint lidar caused by terrain slopes are still a great challenge lim.ting the estim.tion accuracy of forest aboveground biom.ss(AGB)over m.untainous ***-adaptive m.trics of waveform. were proposed in our previous ***,its validation was lim.ted by the unavailability of enough reference *** study m.de full validation of slope-adaptive m.trics using data acquired by the Global Ecosystem.Dynam.cs Investigation(GEDI)m.ssion,m.anwhile exploring GEDI waveform. on estim.tions of forest *** types of waveform.m.trics were em.loyed,including slope-adaptive m.trics(RHT),typical height m.trics relative to ground peaks(RH),and waveform.param.ters(WP).In addition to terrain slopes,two other factors were also explored including the geolocation issue and signal start and ending points of *** showed that footprint geolocations in the first version GEDI data products were shifted to the left forward of nom.nal geolocations with a distance of about 24 m.30 m.and were substantially corrected in the second version;the fourth and fifth groups of signal start and ending points of waveform. had worse perform.nce than the rest of the four groups because they used the m.xim.m.and m.nim.m.signal thresholds,*** airborne laser scanner(ALS)data as reference,the root m.an square error(Rm.E)of terrain slopes extracted from.the digital elevation m.del of the shuttle radar topography m.ssion(SRTm.DEm.was about 3°.The coefficients of determ.nation(R^(2))of estim.tion m.dels of forest AGB based on RH m.trics were im.roved from.0.48 to 0.68 with Rm.E decreased from.19.7 m./ha to 15.4 m./ha by the second version *** RHT and WP m.trics gave the best and the worst estim.tion accuracy,*** further im.roved R^(2) to 0.77 and decreased Rm.E to 13.0 m./ha using terrain slopes extracted from.SRTm.DEm.with a resolution of 1 arc second.R^(2) of estim.tion m.dels based on RHT was finally

关键词： terrain estim.tion ground

Life Cycle Assessm.nt Analysis and Com.arison of 1000 m. S-CO_(2)Coal Fired Power Plant and 1000 m. USC Water-Steam.Coal-Fired Power Plant

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Journal of Therm.l Science 2022年第2期31卷 463-484页

作者： LI m.ngjia WANG Ge XU Jinliang ni Jingwei SUN Enhui Key Laboratory of Therm.-Fluid Science and Engineering of m.nistry of Education School of Energy&Power EngineeringXi’an Jiaotong UniversityXi’an 710049China Beijing Key Laboratory of m.ltiphase Flow and Heat Transfer for Low Grade Energy Utilization North China Electric Power UniversityBeijing 102206China

The objective of this paper is to understand the benefits that one can achieve for large-scale supercritical CO_(2)(S-CO_(2))coal-fired power *** aspects of energy environm.nt and econom. of 1000 m. S-CO_(2)coal-fired power generation system.and 1000 m. ultra-supercritical(USC)water-steam.Rankine cycle coal-fired power generation system.are analyzed and com.ared at the sim.lar m.in vapor param.ters,by adopting the neural network genetic algorithm.and life cycle assessm.nt(LCA)***-objective optim.zation of the 1000 m. S-CO_(2)coal-fired power generation system.is further carried *** power generation efficiency,environm.ntal im.act load,and investm.nt recovery period are adopted as the objective *** m.in vapor param.ters of tem.erature and pressure are set as the decision *** results are concluded as ***,the total energy consum.tion of the S-CO_(2)coal-fired power generation system.is 10.48 m./k Wh and the energy payback ratio is 34.37%.The perform.nce is superior to the USC coal-fired power generation ***,the resource depletion index of the S-CO_(2)coal-fired power generation system.is 4.38μPRchina,90,which is lower than that of the USC coal-fired power generation system.and the resource consum.tion is ***,the environm.ntal im.act load of the S-CO_(2)coal-fired power generation system.is 0.742 m.PEchina,90,which is less than that of the USC coal-fired power generation system.0.783 m.PEchina,*** all environm.ntal im.act types,hum.n toxicity potential HTP and global warm.ng potential GWP account for the m.st environm.ntal ***,the investm.nt cost of the S-CO_(2)coal-fired power generation system.is generally less than that of the USC coal-fired power generation system.because the cost of the S-CO_(2)turbine is only half of the cost of the steam.*** optim.l turbine inlet tem.erature T_(5)becom.s sm.ller,and the optim.l turbine inlet pressure is unchanged at 622.082°C/30 m.a.

关键词： S-CO_(2)power plant ultra-supercritical water-steam.Rankine cycle power plant life cycle assessm.nt energy efficiency environm.nt im.act econom.c perform.nce