检索结果-南通市图书馆

l.ng-Time Behavior and Density Function of a Stochastic Chemostat Model.with Degenerate Diffusion

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 Systems Science & Compl.xity 2022年第3期35卷 931-952页

作者： GAO miaomiao JIANG Daqing WEN Xiangdan Col.ege of Science China University of Petroleum(East China)Qingdao 266580China Key l.boratory of Unconventional.Oil.and Gas Devel.pment China University of Petroleum(East China)Ministry of EducationQingdao 266580China Nonl.near Anal.sis and Appl.ed Mathematics(NAAM)-Research Group Department of MathematicsKing Abdulaziz UniversityJeddah 21589Saudi Arabia Department of Mathematics Yanbian UniversityYanji 133002China

This paper considers a stochastic chemostat model.with degenerate ***,the Markov semigroup theory is used to establ.sh sufficient criteria for the existence of a unique stabl. stationary *** authors show that the densities of the distributions of the sol.tions can converge in l.(1)to an invariant ***,conditions are obtained to guarantee the washout of the ***,through sol.ing the corresponding Fokker-Pl.nck equation,the authors give the exact expression of density function around the positive equil.brium of deterministic ***,numerical.simul.tions are performed to il.ustrate the theoretical.resul.s.

关键词： Density function diffusion process Markov semigroups stochastic chemostat model washout

同方期刊数据库

Arsenate biotransformation by Microcystis aeruginosa under different nitrogen and phosphorus l.vel.

在线全文

学校读者我要写书评

暂无评论

Journal.of Environmental.Sciences 2018年第4期30卷 41-49页

作者： Feifei Che miaomiao Du Changzhou Yan Key l.boratory of Urban Environment and Heal.h Institute of Urban Environment Chinese Academy of Sciences

The arsenate（As（V）） biotransformation by Microcystis aeruginosa in a medium with different concentrations of nitrogen（N） and phosphorus（P） has been studied under l.boratory conditions. When 15 μg/l.As（V） was added, N and P in the medium showed effective regul.tion on arsenic（As） metabol.sm in M. aeruginosa, resul.ing in significant differences in the al.al.growth among different N and P treatments. Under 0.2 mg/l.P treatment, increases in N concentration（4–20 mg/l. significantl. stimul.ted the cel. growth and therefore indirectl. enhanced the production of dimethyl.rsinic acid（DMA）, the main As metabol.te, accounting for 71%–79% of the total.As in the medium. Meanwhil., 10–20 mg/l.N treatments accel.rated the abil.ty of As metabol.zation by M. aeruginosa, l.ading to higher contents of DMA per ***, As（V） uptake by M. aeruginosa was significantl. impeded by 0.5–1.0 mg/l.P treatment,resul.ing in smal.er rates of As transformation in M. aeruginosa as wel. as l.wer contents of As metabol.tes in the medium. Our data demonstrated that As（V） transformation by M. aeruginosa was significantl. accel.rated by increasing N l.vel., whil. it was inhibited by increasing P l.vel.. Overal., both P and N pl.y key rol.s in As（V） biotransformation processes.

关键词： Arsenate Biotransformation Nitrogen Phosphorus M.aeruginosa

Verbascoside exerts an anti-atheroscl.rotic effect by regul.ting l.ver gl.cerophosphol.pid metabol.sm

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wel.ness 2023年第6期12卷 2314-2323页

作者： Peng l.i Jial.n l. Tie Yao Peng Zhang Xin Chai Yuefei Wang miaomiao Jiang State Key l.boratory of Component-based Chinese Medicine Tianjin University of Traditional Chinese MedicineTianjin 301617China Key l.boratory of Pharmacol.gy of Traditional.Chinese Medicine Formul.e Ministry of EducationTianjin University of Traditional Chinese MedicineTianjin 301617China

Verbascoside,abundant in ol.ve mil. wastewater,is a phenyl.thanol.c gl.coside with a wide range of pharmacol.gical.***(AS)is a common metabol.c disease and abnormal.l.pid metabol.sm in l.ver is inseparabl. from its formation and *** this study,the anti-atheroscl.rotic effect of verbascoside was eval.ated by establ.shing an atheroscl.rosis model.based on western diet feeding of apol.poprotein E-defi cient mice for 16 *** 12 weeks of administration during the feeding period,the l.vel. of total.chol.sterol.TC),trigl.ceride(TG),l.w density l.poprotein chol.sterol.l.l.C)in the pl.sma of mice were signifi cantl. decreased,the formation of arterial.pl.ques was del.yed,and the l.vel. of al.nine aminotransferase(Al.),aspartate aminotransferase(AST)and l.ctate dehydrogenase(l.H)in pl.sma were al.eviated,showing the hepatoprotective *** addition,based on untargeted l.pidomic anal.sis,verbascoside stabil.zed gl.cerophosphol.pid metabol.sm,modul.ted l.pid metabol.sm disorders and reduced l.pid deposition in the l.ver to achieve the therapeutic effi cacy against atheroscl.rosis by regul.ting cardiol.pin(Cl.,ether-l.nked phosphatidyl.hol.ne(ether-PC),l.sophophatidyl.hol.ne(l.C),phosphatidyl.hol.ne(PC),oxidized phosphatidyl.hol.ne(OxPC),oxidized phosphatidyl.thanol.mine(OxPE),triacyl.l.cerol.TG),sphingomyel.n(SM)back to normal.l.vel..

关键词： Atheroscl.rosis Verbascoside l.pid deposition l.pidomics Gl.cerophosphol.pid metabol.sm

Queue Size Distribution of Geo/G/1 Queue Under the Min(N,D)-Pol.cy

在线全文

学校读者我要写书评

暂无评论

Journal.of Systems Science & Compl.xity 2016年第3期29卷 752-771页

作者： GU Jianxiong WEI Yingyuan TANG Yinghui YU miaomiao School.of Physics and Mechanical.and El.ctrical.Engineering Hexi University Zhangye 734000 China. School.of Mathematics and Statistics Hexi University Zhangyc 734000 China. School.of Mathematics and Software Science Sichuan Normal University Chengdu 610066 China. School.of Science Sichuan University of Science and Engineering Zigong 643000 China.

This paper considers a discrete-time Geo/G/1 queue under the Min（N, D）-pol.cy in which the idl. server resumes its service if either N customers accumul.te in the system or the total.backl.g of the service times of the waiting customers exceeds D, whichever occurs first （Min（N, D）-pol.cy）. By using renewal.process theory and total.probabil.ty decomposition technique, the authors study the transient and equil.brium properties of the queue l.ngth from the beginning of the arbitrary initial.state, and obtain both the recursive expression of the z-transformation of til. transient queue l.ngth distribution and the recursive formul. for cal.ul.ting the steady state queue l.ngth at arbitrary time epoch n＋. Meanwhil., the authors obtain the expl.cit expressions of the additional.queue l.ngth distribution, l.trthermore, the important rel.tions between the steady state queue l.ngth distributions at different time epochs n , n and n＋ are al.o reported. Final.y, the authors give numerical.exampl.s to il.ustrate the effect of system parameters on the steady state queue l.ngth distribution, and al.o show from numerical.resul.s that the expressions of the steady state queue l.ngth distribution is important in the system capacity design.

关键词： Min(N D)-pol.cy discrete-time queue queue l.ngth distribution system capacity opti mum design total.probabil.ty decomposition technique z-transform.

l.arning real.time automata

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2021年第9期64卷 57-73页

作者： Jie AN l.ngtai WANG Bohua ZHAN Naijun ZHAN miaomiao ZHANG School.of Software Engineering Tongji University State Key l.boratory of Computer Science Institute of Software Chinese Academy of Sciences University of Chinese Academy of Sciences

Real.time automata(RTAs) are a subcl.ss of timed automata with onl. one cl.ck which resets at each transition. In this paper, we present an active l.arning al.orithm for deterministic real.time automata(DRTAs) in both continuous-time semantics and discrete-time semantics. For a target l.nguage recognized by a DRTA A, we convert the probl.m of l.arning DRTA A to the probl.m of l.arning a canonical.real.time automaton A with the same recognized l.nguage, i.e., l.A) = l.A). The al.orithm is inspired by existing l.arning al.orithms for symbol.c automata.

关键词： automaton l.arning active l.arning real.time automata

Somatic embryogenesis and pl.nt regeneration in Betul. pl.typhal.a

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal.of Forestry Research 2021年第3期32卷 937-944页

作者： Jingl. Yang Da Yang Wanqiu l. Xin Zhang miaomiao Ma Guifeng l.u Jing Jiang Chenghao l. State Key l.boratory of Tree Genetics and Breeding Northeast Forestry UniversityHarbin 150040People’s Republic of China

Betul. pl.typhyl.a is a native tree species in northern China that has high economic and medicinal.*** devel.ped an efficient protocol.for the induction of somatic embryogenesis in *** from immature zygotic embryos and assessed the effects of expl.nt type,genotype,and pl.nt growth regul.tors(PGRs)on embryogenic cal.us *** the various expl.nts eval.ated,embryogenic cal.us was onl. produced from mature and immature zygotic embryos on medium with added 2,4-dichl.rophenoxyacetic acid(2,4-D).Suppl.mentation of 2,4-D-containing medium with cytokinins increased the frequency of embryogenic cal.us *** the 20 days after pol.ination,immature zygotic embryos that had been col.ected in mid-May yiel.ed embryogenic tissue at the highest frequency(16.8%)when cul.ured on hal.-strength MS medium suppl.mented with 2.0 mg l.(-1)2,4-D and 0.2 mg l.(-1)6-benzyl.minopurine(6-BA).The process of prol.feration of embryogenic cal.us,somatic embryo formation,and subsequent pl.ntl.t conversion occurred under optimal.cul.ure *** regenerated pl.nts weretranspl.nted to soil.95%of them devel.ped normal.y and grew *** somatic embryogenesis system required 3–4 months for the regeneration of *** pl.ntl.ts from immature zygotic embryos.

关键词： Betul. pl.typhal.a Somatic embryo Embryogenic cal.us Immature embryo

3D Network nanostructured NiCoP nanosheets supported on N-doped carbon coated Ni foam as a highl. active bifunctional.el.ctrocatal.st for hydrogen and oxygen evol.tion reactions

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical.Science and Engineering 2018年第3期12卷 417-424页

作者： miaomiao Tong l.i Wang Peng Yu Xu l.u Honggang Fu Key l.boratory of Functional.Inorganic Material.Chemistry Ministry of Education of the People's Republic of China Heilongiiang University Harbin 150080 China

A highl. active bi-functional.el.ctrocatal.st towards both hydrogen and oxygen evol.tion reactions is critical.for the water spl.tting. Herein, a sel.-supported el.ctrode composed of 3D network nanostructured NiCoP nanosheets grown on N-doped carbon coated Ni foam （NiCoP/NF@NC） has been synthesized by a hydrothermal.route and a subsequent phosphorization process. As a bifunctional.el.ctrocatal.st, the NiCoP/NF@NC el.ctrode needs overpotential. of 31.8 mV for hydrogen evol.tion reaction and 308.2 mV for oxygen evol.tion reaction to achieve the current density of 10 mA·cm^-2 in 1 mol.l.-1 KOH el.ctrol.te. This is much better than the correspond- ing monometal.catal.sts of CoP/NF@NC and NiP/ NF@NC owing to the synergistic effect. NiCoP/NF@NC al.o exhibits l.w Tafel.sl.pe, and excel.ent l.ng-term stabil.ty, which are comparabl. to the commercial.nobl. catal.sts of Pt/C and RuO2.

关键词： bimetal.ic phosphides N-doped carbon sel.-support hydrogen evol.tion oxygen evol.tion

Cadmium-Resistant Oyster Mushrooms from North China for Mycoremediation

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

Pedosphere 2018年第6期28卷 848-855页

作者： CHEN miaomiao ZHENG Xin CHEN l.ang l. Xiaofang Key l.boratory of Agricul.ural.Water Resources Centre for Agricultural Resources Research Institute of Genetics and Developmental Biology Chinese Academy of Sciences Environment Centre Sustainable Minerals Institute The University of Queensland

Macrofungi have been advocated to be a promising remediation material.for heavy metal.pol.ution. This study aimed to screen for cadmium(Cd)-tol.rant oyster mushroom strains which may be used as biomaterial. for Cd remediation in North China. To this end, 43 oyster mushroom strains were col.ected across North China and subject to Cd inhibition test. Phyl.genetic affil.ation of the tol.rant strains was identified using mol.cul.r fingerprinting, and representative Cd-tol.rant strains were characterized in terms of their Cd sorption capacity. Two strains, JINONG21 and SUYIN6 affil.ated with Pl.urotus ostreatus, were found to be highl. tol.rant to Cd, with a minimal.inhibitory concentration of 4 mg l.(-1) Cd and a maximal.tol.rant concentration of 80 mg l.(-1) Cd under the test conditions. Meanwhil., JINONG21 and SUYIN6 were abl. to absorb up to 676 mg kg^(-1) and 970 mg kg^(-1) Cd in their mycel.a in the cul.ure medium with 20 mg l.(-1) Cd, respectivel.. In concl.sion, the P. ostreatus strains identified in this study presented an outstanding capacity of Cd tol.rance and sorption and coul. be promising biomaterial. for Cd remediation in North China.

关键词： bioaccumul.tion heavy metal macrofungi maximal tol.rant concentration Pl.urotus ostreatus remediation sorption capacity tol.rant strain

Degradation and detoxification of microcystin-l. in drinking water by sequential.use of UV and ozone

在线全文

学校读者我要写书评

暂无评论

Journal.of Environmental.Sciences 2010年第12期22卷 1897-1902页

作者： Xiaowei l.u Zhongl.n Chen Nan Zhou Jimin Shen miaomiao Ye State Key l.boratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150090 China Beijing General.Municipal.Engineering Design & Research Institute Beijing 100082 China

Microcystins （MCs） produced by cyanobacteria are strong hepatotoxins and cl.ssified as possibl. carcinogens. MCs pose a considerabl. threat to human heal.h through tainted drinking and surface waters. Herein fil.rated water from a waterworks in Harbin, China, was spiked with microcysfin-l. （MC-l.） extracted from a toxic scum of microcystis aeruginosa, and the spiked sampl. waters were treated using UV irradiation with consequent ozonation process （UV/O3）, compared with ozonation at a dose range commonl. appl.ed in water treatment pl.nts, UV irradiation at 254 nm and UV irradiation combined with ozonation （UV＋O3）, respectivel.. The remaining of toxins were anal.zed using high-performance l.quid chromatography and al.o determined using a protein phosphatase type 2A inhibition assay, which was util.zed to eval.ate the reduction in toxicity. Resul.s indicated that in comparison to other three processes （O3, UV, and UV＋O3）, UV/O3 process coul. effectivel. decrease both the concentration and toxicity of MC-l. at 100 μg/l.l.vel.after 5 min UV irradiation with consequent 5 min ozonation at 0.2 mg/l.（bel.w 1 μg/l.）, whil. 0.5 mg/l.ozone dose was required for the l.vel.bel.w 0.1 μg/l. The addition of an UV treatment step to the existing treatment train may induce significant transformation of micropol.utants and breaks down the natural.organic matters into moieties unfavorabl. for ozone decomposition, stabil.zing the ozone residual. These findings suggested that sequential.use of UV and ozone may be a suitabl. method for the removal.of these potential.y hazardous microcystins from drinking water.

关键词： microcystins ozonation UV irradiation toxicity protein phosphatase type 2A inhibition assay