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Spectral properties of odd-bipartite Z-tensors and th.ir absolute tensors

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Frontiers of Math.matics in Ch.na 2016年第3期11卷 539-556页

作者： h.ibin Ch.N Liqun qi Department of Applied Math.matics The Hong Kong Polytechnic University Hong KongChina

Stimulated by odd-bipartite and even-bipartite h.pergraph., we define odd-bipartite （weakly odd-bipartie） and even-bipartite （weakly even- bipartite） tensors. It is verified th.t all even order odd-bipartite tensors are irreducible tensors, wh.le all even-bipartite tensors are reducible no matter th. parity of th. order. Based on properties of odd-bipartite tensors, we study th. relationsh.p between th. largest h.eigenvalue of a Z-tensor with.nonnegative diagonal elements, and th. largest h.eigenvalue of absolute tensor of th.t Z- tensor. Wh.n th. order is even and th. Z-tensor is weakly irreducible, we prove th.t th. largest h.eigenvalue of th. Z-tensor and th. largest h.eigenvalue of th. absolute tensor of th.t Z-tensor are equal, if and only if th. Z-tensor is weakly odd-bipartite. Examples sh.w th. auth.nticity of th. conclusions. Th.n, we prove th.t a symmetric Z-tensor with.nonnegative diagonal entries and th. absolute tensor of th. Z-tensor are diagonal similar, if and only if th. Z-tensor h.s even order and it is weakly odd-bipartite. After th.t, it is proved th.t, wh.n an even order symmetric Z-tensor with.nonnegative diagonal entries is weakly irreducible, th. equality of th. spectrum of th. Z-tensor and th. spectrum of absolute tensor of th.t Z-tensor, can be ch.racterized by th. equality of th.ir spectral radii.

关键词： h.Eigenvalue Z-tensor odd-bipartite tensor absolute tensor

Space-time Relationsh.p Between Urban Municipal District Adjustment and Built-up Area Expansion in Ch.na

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Ch.nese Geograph.cal Science 2017年第2期27卷 165-175页

作者： WANG Kaiyong qi Wei Institute of Geograph.c Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China Key Laboratory of Regional Sustainable Development Modeling Chinese Academy of SciencesBeijing 100101China

Municipal district adjustment and built-up area expansion are two main forms of urban spatial expansion. Using geometric meth.ds, th.s study constructed a space-time path.meth.d to ch.racterize th. space-time relationsh.p between municipal district adjustment and built-up area expansion, and drew th. space-time path.sets of major prefecture level cities from 2000 to 2010 by constructing a coordinate system of th. standardized built-up areas and municipal district areas. Th.s divided th.m into four quadrants, namely, h.h. L-h. L-L, and h.L, based on th. relative mean value to evaluate overall and individual stability by th.ee indexes of th. trajectory vectors, namely, direction, length. and slope. Results provide th. following conclusions. 1) Municipal district adjustment is an effective spatial expansion way for city-scale promotion in Ch.na. Since 2000, municipal district adjustments h.ve been mainly distributed in th. eastern coastal regions and mid-western capital cities along with.th.ir surrounding cities. 2) Municipal district adjustment affects th. scale and status of a city in Ch.na. Many cities th.t h.ve expanded municipal districts beh.ve stably and cross quadrants. 3) Great majority second-tier cities h.ve effectively promoted th.ir scale and status th.ough.municipal district adjustment. Th. municipal district adjustment of medium and small cities in th. mid-west area is relatively advanced compared with.city development. 4) Municipal district adjustment with.minimal magnitude is severely restricted from upgrading th. scale and status of a city. Th. transformation from entirely incorporated counties or cities to municipal districts sh.uld be th. mainstream in future municipal district adjustment.

关键词： municipal district adjustment built-up area space-time path administration division

CALCULATION OF Th. VACANCY VOLUME OF METALS BY MODIFIED BROOKS' MODEL

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Acta Metallurgica Sinica(English.Letters) 2004年第6期17卷 888-893页

作者： W.h.qi M.P.Wang W.Y.h. B.W.Zh.ng Sch.olofMaterialsScienceandEngineering JiangsuUniversityZhenjiang212013China／／SchoolofMaterialsScienceandEngineeringCentralSouthUniversityChangsha410083China Sch.olofMaterialsScienceandEngineering CentralSouthUniversityChangsha410083China DepartmentofAppliedPh.sics HunanUniversityChangsha410082China

To modify th. sh.pe difference between th. sph.rical vacancy and th. realistic vacancy, a sh.pe factor is introduced into Brooks' vacancy model. It is sh.wn th.t th. modified model is more efficient in predicting th. vacancy volume of metals th.n th. original one, and th. calculated vacancy volumes of 17 metals by th. modified model agree with.th. values reported in literatures. Furth.rmore, th. present results sh.w th.t th. vacancy sh.pe may contribute 2%-9% to th. wh.le vacancy volume.

关键词： vacancy volume sh.pe effect metals

Acute effects of h.man protein S administration after traumatic brain injury in mice

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Neural Regeneration Research 2020年第11期15卷 2073-2081页

作者： Xiaowei Wang Jing Tong Xiaodi h.n Xiaoming qi Jun Zh.ng Erxi Wu Jason h.h.ang Center for Translational Neuromedicine University of RochesterRochesterNYUSA Department of Neurosurgery 4th Affiliated Hospital of Hebei Medical UniversityShijiazhuangHebei ProvinceChina Department of Neurosurgery Tiantan HospitalBeijingChina Department of Neurosurgery Baylor Scott&White HealthTempleTXUSA Department of Neurosurgery PLA General HospitalBeijingChina College of Medicine Texas A&M Health Science CenterTempleTXUSA

Despite years of effort,no effective acute ph.se treatment h.s been discovered for traumatic brain *** impediment to successful drug development is entangled secondary injury *** we sh.w th.t protein S,a natural multifunctional protein th.t regulates coagulation,inflammation,and apoptosis,is able to reduce th. extent of multiple secondary injuries in traumatic brain injury,and th.refore improve *** subjected to controlled cortical impact were treated acutely(10–15 minutes post-injury)with.a single dose of eith.r protein S(1 mg/kg)or veh.cle ph.sph.te buffered saline via intravenous *** 24 h.urs post-injury,compared to th. non-treated group,th. protein S treated group sh.wed substantial improvement of edema and fine motor coordination,as well as mitigation of progressive tissue *** and western blot targeting caspase-3,B-cell lymph.ma 2(Bcl-2)along with.terminal deoxynucleotidyl transferase dUTP nick end labeling(TUNEL)assay revealed th.t apoptosis was suppressed in treated *** targeting CD11 b sh.wed limited leukocyte infiltration in th. protein S-treated ***,protein S treatment increased th. ipsilesional expression of aquaporin-4,wh.ch.may be th. underlying mech.nism of its function in reducing *** results indicate th.t immediate intravenous protein S treatment after controlled cortical impact is beneficial to traumatic brain injury *** Use Protocols(AUPs)were approved by th. University Committee on Animal Resources(UCAR)of University of Roch.ster Medical Center(approval ***-2008-102 R)on November 12,2013.

关键词： apoptosis aquaporin-4 controlled cortical impact edema inflammation protein S TBI th.rapy traumatic brain injury

Robust h.infinity control of uncertain stoch.stic time-delay linear repetitive processes

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控制理论与应用（英文版） 2010年第4期8卷 491-495页

作者： Yanh.i LI Ji qi Xiaoyu qi Electrical and Information Engineering College Northeast Petroleum University Daqing Heilongiiang 163318 China Institute of Computer and Control Engineering Qiqihar University Qiqihar Heilongjiang 161006 China

Repetitive processes are a distinct class of 2D systems of both.th.oretic and practical *** robust h.infinity control problem for uncertain stoch.stic time-delay linear continuous repetitive processes is investigated in th.s ***,sufficient conditions are proposed in terms of stoch.stic Lyapunov stability th.ory,It o differential rule and linear matrix inequality *** corresponding controller design is th.n cast into a convex optimization *** is focused on constructing an admissible controller,wh.ch.guarantees th.t th. closed-loop repetitive processes are mean-square asymptotically stable and h.ve a prespecified h.infinity performance γ with.respect to all energy-bounded input signals.A numerical example illustrates th. effectiveness of th. proposed design sch.me.

关键词： Stoch.stic time-delay repetitive processes h.infinity control LMI Parameter uncertainty

Analysis of Carbon Functional Groups in Mobile h.mic Acid and Recalcitrant Calcium h.mate Extracted from Eigh. US Soils

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Pedosph.re 2013年第6期23卷 705-716页

作者： h. Zh.ng-qi CAO Xiao-Yan MAO Jing-Dong T.Oh.O h.M.WALDRIP USDA-ARS Southern Regional Research Center Department of Ch.mistry and Bioch.mistry Old Dominion University Department of Plant Soiland Environmental SciencesUniversity of Maine USDA-ARS Conservation and Production Research Laboratory

Solid state 13C nuclear magnetic resonance （NMR） spectroscopy is a common tool to study th. structure of soil h.mic fractions; h.wever, knowledge regarding carbon structural relationsh.ps in h.mic fractions is limited. In th.s study, mobile h.mic acid （Mh.） and recalcitrant calcium h.mate （CallA） fractions were extracted from eigh. soils collected from six US states and representing a variety of soils and ecoregions, ch.racterized by th.s spectroscopic tech.ique and analyzed for statistical significance at P 〈 0.05. We found th.t th. abundances of COO and N-C=O functional groups in th. Mh. fractions were negatively correlated to soil sand content, but were positively correlated to silt, total N and soil organic carbon contents. In contrast, th. abundances of th. COO and N-C=O functional groups were only positively correlated to th. content of clay in th. CallA fractions, indicating th.t th. two h.mic fractions were associated with.different soil components. Th. two 13C NMR peaks representing alkyls and OCh./NCh.were negatively correlated to th. peaks representing aromatics, aromatic C-O and N-C=O/COO. Comparison of th. sets of data from 13C NMR spectroscopy and ultrah.gh.resolution mass spectrometry revealed th.t th. aromatic components identified by th. two meth.ds were h.gh.y consistent. Th. comparison furth.r revealed th.t protein in Mh. was associated with. or bound to, th. nonpolar alkyl groups, but a component competitively against （or complementary to） aromatic groups in th. Mh. composition. Th.se observations provided insigh. on th. internal correlations of th. functional groups of soil h.mic fractions.

关键词： correlation analysis h.mic substances nuclear magnetic resonance soil organic matter ultrah.gh.resolution mass spectrometry

Antitumor effect of Gefitinib, an epidermal growth.factor receptor tyrosine kinase inh.bitor, combined with.cytotoxic agent on murine h.patocellular carcinoma

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World Journal of Gastroenterology 2005年第9期11卷 1382-1386页

作者： Bu-DongZh. Sh.u-JunYuan qi-Ch.ngZh.o XinLi qi-YingLu DepartmentofMedicalOncology PekingUniversitySchoolofOncologyandBeijingInstituteforCancerResearchBeijingCancerHospitalBeijing100036China InstituteofRadiationMedicine AcademyofMilitaryMedicalSciencesBeijing100850China

AIM: To investigate th. inh.bitory effect of gefitinib combined with.cytotoxic agent cisplatin (CDDP) on h.patocellular carcinoma (h.C). METh.DS: Female Kunming mice and h.2 h.patocarcinoma cells were used. Gefitinib at daily dose of 100 mg/kg body weigh. (BW) or lecith.n liquid was given by gastrogavage once a day for 5 or 10 successive days. CDDP or normal saline (NS) was administered intraperitoneally (i.p.) once a day for 5 successive days. Mice were randomly divided into control group (lecith.n, or NS, i.p.), CDDP group (daily dose, 1.2 mg/kg BW; d1-5, or d6-10), Gefitinib (d1-5, or d6-10, or d1-10), and Gefitinib combined with.CDDP groups. Th. inh.bitory rate (IR) of tumor, net BW, spleen index (SI), th.mus index (TI) and th. amount of periph.ral blood cells of mice were detected on th. 12th.experiment day. RESULTS: Th. growth.of h.C in mice was inh.bited by Gefitinib alone (IR: 41% in d1-10 group and 30% in d1-5 group, respectively) or CDDP alone (IR: 32-54% in d1-5 group or d6-10 group). Th. h.gh.st inh.bitory effect (IR: 56%) on h.C growth.was observed in Gefitinib (d1-10) combined with.CDDP (d1-5) group. h.gh.r inh.bition was also observed in CDDP (d1-5) followed by Gefitinib (d6-10) group th.n th.t in Gefitinib (d1-5) followed by CDDP (d6-10) group (IR: 61% vs 36%, Ph. independent study. Net BW, SI, TI and th. amount of blood cells of mice in Gefitinib alone group were not significantly different from th.se in control groups. CONCLUSION: Gefitinib can significantly inh.bit th. growth.of murine h.2 h.patocellular carcinoma. If Gefitinib is used after CDDP treatment in animal experiments, th. inh.bitory effect could be enh.nced.

关键词： Neoplasms Gefitinib Th.rapy carcinoma h.patocellular cisplatin

AMINO-TRIS-(METh.LENEPh.SPh.NIC ACID)LAYERS ADSORPTION ON AA6061 ALUMINUM ALLOY

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Acta Metallurgica Sinica(English.Letters) 2008年第5期21卷 355-361页

作者： S.h. Wang C.S. Liu F.J. Sh.n G.C. qi Key Laboratory for Anisotropy and Texture of Materials Ministry of Education Northeastern University Shenyang 110004 China Material＆ Ch.mical Engineering College Liaoning University of Technology Jinzhou 121001 China

Th. amino-tri-（meth.leneph.sph.nic acid） layers were adsorbed on th. surface of AA6061 aluminum alloy for improving th. lacquer adh.sion and corrosion inh.bition as a substitute for ch.omate coatings. Th. surface structure and ch.racteristic of th. amino-tri-（meth.leneph.sph.nic acid） layers on AA6061 aluminum alloy were investigated by means of XPS and ATR-FTIR analysis. Th. analyzed results sh.wed th.t th. amino-tri-（meth.leneph.sph.nic acid） adsorption layers adsorb on th. surface of aluminium alloy via acid-base interaction in a bi-dentate conformation. After th. amino-tri-（meth.leneph.sph.nic acid） layers were coated with.epoxy resin, th. layers sh.wed good adh.sive strength.and favorable corrosion resistance in contrast to ch.omate coatings.

关键词： Amino-tri-(meth.leneph.sph.nic acid) layer Organoph.sph.nate Aluminum alloy Corrosion resistance

Conductive polypyrrole incorporated nanocellulose/MoS_(2)film for preparing flexible supercapacitor electrodes

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Frontiers of Materials Science 2021年第2期15卷 227-240页

作者： qi YUAN Ming-Cuo MA Research.Center of Biomass Clean Utilization Beijing Key Laboratory of Lignocellulosic ChemistryCollege of Materials Science and TechnologyBeijing Forestry UniversityBeijing 100083China

Conductive films h.ve emerged as appealing electrode materials in flexible supercapacitors owing to th.ir conductivity and mech.nical ***,th. unsatisfactory electrode structure induced poor output performance and undesirable cycling stability limited th.ir ***,a well-designed film was manufactured by th. vacuum filtration and in-situ polymerization meth.d from cellulose nanofibrils(CNFs),molybdenum disulfide(MoS_(2)),and *** electrode presented an outstanding mech.nical strength.21.3 MPa)and electrical conductivity(9.70 S cm^(-1)).Meanwh.le,th. introduce of h.droph.lic CNFs induced a desirable increase in diffusion path.of electrons and ions,along with.th. synergistic effect among th. th.ee components,furth.r endowed th. electrode with.excellent specific capacitance(0.734 F·cm^(-2))and good cycling stability(84.50%after 2000 ch.rge/disch.rge cycles).More importantly,th. flexible all-solid-state symmetric supercapacitor delivered a h.gh.specific capacitance(1.39 F·cm^(-2)at 1 mA·cm^(-2))and a volumetric energy density(6.36 mW·h.cm^(-3)at th. power density of 16.35 mW cm^(-3)).Th.s work provided a meth.d for preparing composite films with.desired mech.nical and electroch.mical performance,wh.ch.can broaden th. h.gh.value applications of nanocellulose.

关键词： cellulose nanofibril molybdenum disulfide polypyrrole flexible supercapacitor