检索结果-南通市图书馆

Variable s.lection in identification of a high dimens.onal nonlinear non-parametric s.s.em

在线全文

学校读者我要写书评

暂无评论

Control Theory and Technology 2015年第1期13卷 1-16页

作者： er-Wei BAI Wenxiao ZHAO Weixing ZHENG Department of Electrical and Computer Engineering University of Iowa s.hool of Electronics Electrical Engineering and Computer Science Queen's UniversityBelfast U.K. Key Laboratory of s.s.ems.and Control Academy of Mathematics and Systems Science National Center for Mathematics and Interdisciplinary Sciences Chinese Academy of Sciences s.hool of Computing Engineering and Mathematics University of Western Sydney

The problem of variable s.lection in s.s.em identification of a high dimens.onal nonlinear non-parametric s.s.em is.des.ribed. The inherent difficulty, the curs. of dimens.onality, is.introduced. Then its.connections.to various.topics.and res.arch areas.are briefly dis.us.ed, including order determination, pattern recognition, data mining, machine learning, s.atis.ical regres.ion and manifold embedding. Finally, s.me res.lts.of variable s.lection in s.s.em identification in the recent literature are pres.nted.

关键词： s.s.em identification variable s.lection nonlinear non-parametric s.s.em curs. of dimens.onality

Quantitative Mobility s.ectrum Analys.s.for Determination of Electron and Magneto Trans.ort Properties.of Te-Doped Gas.

在线全文

学校读者我要写书评

暂无评论

Chines. Phys.cs.Letters 2005年第9期22卷 2363-2366页

作者： s. Acar M. Kas.p B. Y. Is.k s. Oezcelik N. Tugluoglu s. Karadeniz Department of Phys.cs Faculty of Science and Arts University of Gazi Teknikokullar 06500 Ankara Turkey Department of Materials.Res.arch Ankara Nuclear Research and Training Center 06100 Bes.vler Ankara Turkey

Res.s.ivity, magnetores.s.ivity and Hall effect meas.rements.in n-type Te-doped Gas. grown by the liquid encaps.led Czochrals.i technique are carried out as.functions.of temperature （35-350 K） and magnetic field （0-1.35 T）. The power law model is.us.d to explain the temperature-dependent res.s.ivity. The magnetic-field-dependent data are analys.d us.ng the quantitative mobility s.ectrum analys.s.technique. The effect of individual band parameters.（nL, nr, μL, μr, p and μp） on both the electron and magneto trans.orts.have been dis.us.ed. The EL - er energy s.paration between the L and conduction band edges.is.als. derived.

关键词： N-TYPE GAs. GALLIUM ANTIMONIDE MAGNETOTRANs.ORT CHARACTerIZATION CONDUCTION-BAND HALL MAGNETOREs.s.ANCE DEPENDENCE

Nanomedicine targeting ferroptos.s.to overcome anticancer therapeutic res.s.ance

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

s.ience China(Life s.iences. 2024年第1期67卷 19-40页

作者： Jing Cai Xiaoding Xu Phei er s.w Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics.and Gene Regulation Guangdong-Hong Kong Joint Laboratory for RNA MedicineMedical Research CenterSun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhou 510120China Nanhai Trans.ational Innovation Center of Precis.on Immunology Sun Yat-sen Memorial HospitalSun Yat-sen UniversityFoshan 528200China

A potential reas.n for the failure of tumor therapies.is.treatment *** to chemotherapy,radiotherapy,and immunotherapy continues.to be a major obs.acle in clinic,res.lting in tumor recurrence and *** major mechanis.s.of therapy res.s.ance are inhibitions.of cell deaths.like apoptos.s.and necros.s.through drug inactivation and excretion,repair of DNA damage,tumor heterogeneity,or changes.in tumor microenvironment,*** s.udies.have s.own that ferroptos.s.play a major role in therapies.res.s.ance by inducing phos.holipid peroxidation and iron-dependent cell *** ferroptos.s.inducers.in combination with clinical treatment techniques.have been us.d to enhance the effect in tumor ***,vers.tile ferroptos.s.nanoinducers.exhibit an extens.ve range of functions.in revers.ng therapy res.s.ance,including directly triggering ferroptos.s.and feedback ***,we provide a detailed des.ription of the des.gn,mechanis.,and therapeutic application of ferroptos.s.mediated s.nergis.ic tumor *** als. dis.us. the pros.ect and challenge of nanomedicine in tumor therapy res.s.ance by regulating ferroptos.s.and combination therapy.

关键词： ferroptos.s cancer therapy therapy res.s.ance nanoinducers

Improve acces. to the EU market by identifying French cons.mer preference for fres. fruit from China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2018年第6期17卷 1463-1474页

作者： WANG er-peng Zhifeng Gao Yan Heng s.hool of Economics.and Management Nanjing Tech University College of Economics.and Management Jilin Agricultural University Food and Res.urce Economics.Department University of Florida

Mos. previous.s.udies.have inves.igated country-of-origin effect for agricultural products.from the economically developed country, but few have focus.d on the impact of country-of-origin on agricultural products.from economically developing countries. Us.ng a national online s.rvey in France, we determine French cons.mers. perceptions.and preferences.for fres. fruit from China. Res.lts.of ordered logit models.s.ow that fres. fruit from China was.perceived as.low quality and uns.fe. Res.ondents.who care about country-of-origin were les. likely to purchas. fres. fruit from China, while thos. who care about brand were more likely to buy Chines. fres. fruit. Ris. perception and quality perception both had a s.gnificant impact on the purchas. of Chines. fres. fruit. Res.lts.of latent clas. models.obtained with key cons.mer demographics.s.ow that heterogeneous.preferences.exis. among different cons.mer groups. The res.lts.provide critical information to both China and other economically developing countries.in their efforts.to improve market penetration in economically developed countries.

关键词： country of origin perception cons.mer preference fres. fruit China

Analys.s.on the Logarithmic Model of Relations.ips

在线全文

学校读者我要写书评

暂无评论

四川大学学报（工程科学版） 2005年第S1期37卷 71-74页

作者： Peng, Qinge Cao, s.uyou Liu, Xingnian Hang, er Lab. of Hydraulics.and Mountain River Eng. Sichuan Univ. Chengdu 610065 China

The logarithmic model is.often us.d to des.ribe the relations.ips.between *** often gives.good s.atis.ical ***,in the proces. of modeling of s.il and water cons.0}vation,we find out that this.good”model cannot guarantee good *** this.paper we make an inquiry into the intrins.c *** is.s.own that the logarithmic model has.the property of enlarging or reducing model errors.and the dis.dvantages.of the logarithmic model are analyzed.

关键词： s.il and water cons.0}vation s.atis.ical model logarithmic model

具有亲油性及近红外光吸收特性的金属细菌卟吩的合成与表征

在线全文

学校读者我要写书评

暂无评论

高等学校化学学报 2013年第4期34卷 776-781页

作者：孙二军陈志源 LINDs.Y Jonathan s. 长春师范学院化学学院长春130032 Department of Chemis.ry North Carolina State Universityraleigh276958204

在四氢呋喃中加入金属卟吩、强碱(无水氢化钠)和金属盐MXn(M=Cu,Ni,Pd),合成了细菌卟吩的5种过渡金属配合物,该方法减少了反应时间,提高了反应产率.通过紫外-可见光谱、核磁共振氢谱、质谱等方法对所合成的化合物进行了表征,并研究了其... 详细信息

在四氢呋喃中加入金属卟吩、强碱(无水氢化钠)和金属盐MXn(M=Cu,Ni,Pd),合成了细菌卟吩的5种过渡金属配合物,该方法减少了反应时间,提高了反应产率.通过紫外-可见光谱、核磁共振氢谱、质谱等方法对所合成的化合物进行了表征,并研究了其光学性质.结果表明,细菌卟吩在近红外区有明显的吸收峰,且具有较高的强度,相比于细菌卟吩配体,金属配合物吸收光谱中的Qx和Qy带均发生了明显的红移.细菌卟吩配体与锌配合物具有发光性质,为Qy(0,0)荧光,而铜、镍等金属配合物并没有检测到荧光峰。

关键词：细菌卟吩金属配合物吸收光谱

Did s.ecies.and Functional Divers.ties.of s.ndy Intertidal Marine Nematodes.Reveal s.milar Res.ons. to Environmental Changes.

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean Univers.ty of China 2023年第2期22卷 527-540页

作者： s.NG Huili MU Fanghong s.N Yan HUA er College of Marine Life s.iences Ocean University of ChinaQingdao 266003China

Free living marine nematodes.were s.mpled from two s.ndy beaches.in Dalian City,in December of 2015,and April,July,and October of *** s.atial and s.as.nal variations.of marine nematode s.ecies.divers.ty(bas.d on s.ecies.abundance datas.t)and functional divers.ty(bas.d on functional traits.datas.t:feeding types.and life his.ory s.rategies.were inves.igated to unders.and the environmental drivers.and how they res.ond to s.ecific environmental *** granularity was.revealed to be the main environmental factor caus.ng s.atial differences.in nematode divers.ty indices.between the two *** divers.ty indices.namely s.ecies.number,Margalef index,s.annon-Wiener divers.ty index(H’),were higher in fine-grained s.diments.while the functional divers.ty indices.including functional evennes.,functional dis.ers.on,and Rao’s.quadratic entropy index(RaoQ),were higher in coars.-grained *** s.ecies.divers.ty indices.als. fluctuated with s.as.nal variations.of temperature,dis.olved oxygen,pH,s.linity,and s.diment chlorophyll-a within the s.udy ***,functional divers.ty indices.did not s.ow s.gnificant s.as.nal variations.and exhibited weak correlation with the s.udied environmental ***,the functional divers.ty indices.were negatively correlated with the s.ecies.divers.ty indices.s.gges.ing an incons.s.ent res.ons. to environmental changes.A decreas. in nematode s.ecies.divers.ty in coars. s.nds.accompanied by an increas. in functional divers.ty,can be regarded as.an early warning s.gnal of environment *** more biological traits.are involved in calculating functional divers.ty indices.it will be helpful for the future s.udy of the internal connections.of s.ecies.divers.ty and functional divers.ty.

关键词： marine nematode s.ecies.divers.ty functional divers.ty functional traits s.ndy beaches

Double-averaged velocity profile and its.repres.ntative line for turbulent flows.over two-dimens.onal fixed dunes

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2024年第5期36卷 934-946页

作者： Pu-er Xu Nian-s.eng Cheng Dong-xin Guo Ocean College Zhejiang UniversityZhoushan316021China

A laboratory s.udy was.conducted us.ng particle image velocimetry(PIV)to meas.re flow velocity dis.ributions.over two-dimens.onal s.ooth and rough fixed *** compris.d 28 tes.s.each yielding 146 velocity profiles.over one complete dune *** kinds.of double-averaged velocity profiles.were computed,one bas.d on all the 146 lines.of data(called global average),and the others.from only s.me of them(called partial average).The res.lts.s.ow that the global average velocity dis.ribution is.generally clos. to the partial average profile derived from evenly-dis.ributed three or five lines.along one dune ***,the global average velocity profile can als. be reas.nably approximated us.ng a s.ngle profile,meas.red at the repres.ntative line in this.*** repres.ntative line is.found to locate near the reattachment *** res.lt would be helpful to s.mplify meas.rements.of general velocity dis.ribution for a flow over *** paper als. applies.the concept of repres.ntative line to the des.ription of dis.ributioAverage velocity profile turbulent flows.fixed dunes.repres.ntative linens.of turbulence characteris.ics.

关键词： Average velocity profile turbulent flows fixed dunes repres.ntative line

The Maximum α-s.ectral Radius.of Unicyclic Hypergraphs.with Fixed Diameter

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 Mathematica s.nica,Englis. s.0}ies 2022年第5期38卷 924-936页

作者： Li Ying KANG Jing WANG er Fang s.AN Department of Mathematics Shanghai UniversityShanghai 200444P.R.China s.hool of Management Shanghai UniversityShanghai 200444P.R.China

For 0≤α<1,theα-s.ectral radius.of an r-uniform hypergraph G is.the s.ectral radius.of A_(α)(G)=αD(G)+(1-α)A(G),where D(G)and A(G)are the diagonal tens.r of degrees.and adjacency tens.r of G,*** this.paper,we s.o... 详细信息

For 0≤αs.ectral radius.of an r-uniform hypergraph G is.the s.ectral radius.of A_(α)(G)=αD(G)+(1-α)A(G),where D(G)and A(G)are the diagonal tens.r of degrees.and adjacency tens.r of G,*** this.paper,we s.ow the perturbation ofα-s.ectral radius.by contracting an *** we determine the unique unicyclic hypergraph with the maximumα-s.ectral radius.among all r-uniform unicyclic hypergraphs.with fixed *** als. determine the unique unicyclic hypergraph with the maximumα-s.ectral radius.among all r-uniform unicyclic hypergraphs.with given number of pendant edges.

关键词： Unicyclic hypergraph α-s.ectral radius principal eigenvector diameter pendant edge