检索结果-南通市图书馆

INITIAL ATMOSPhERIC CORROSION OF ZINC IN ThE PRESENCE OF Nh_4Cl

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 Metallurgica Sinica(English Letters) 2004年第2期17卷 161-165页

作者： Q.Qu C.W.Yan L.Li L.Zhang g.h.liu C.N.Cao DepartmentofChemistry YunnanUniversityKunming650091China StakeKeyLaboratoryforCorrosionandProtection InstituteofMetalResearchTheChineseAcademy LaboratoryforConservationandUtilizationofBio-Resources YunnanUniversityKunming650091China

Influence of Nh_4 Cl on the initial atmospheric corrosion of zinc was investigated viaquartz crystal microbalance (QCM) in laboratory at 80%Rh and 25℃. The resultsshow that Nh_4 Cl can accelerate the initial corrosion of zinc. Mass gain increase withthe exposure time, but mass gain in the later doesn't change obviously due to theformation of the insoluble simonkolleite on zinc surface in the presence of Nh_4 *** transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) wasused to characterize the corrosion products. Zn_5Cl_2(Oh)_8·h_2O,(Nh_4)_2ZnCl_4 andZnO are the corrosion products on zinc. Brief discussion on the mechanisms of at-mospheric corrosion of zinc in the presence of Nh_4 Cl was introduced.

关键词： atmospheric corrosion zinc Nh_4Cl

Nanozyme catalysis in a crowded environment:The impact of diffusion and surface shielding

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第7期17卷 5795-5800页

作者： Vasily g.Panferov Juewen liu Department of Chemistry Waterloo Institute for NanotechnologyWaterlooOntario N2L 3G1Canada

Nanozymes are widely used in various applications as nanosized catalysts for replacing *** accurate estimation of the catalytic activity of nanozymes in real conditions is *** this article,for the first time,we systematically studied the effect of macromolecular molecules co-existing in the real system on the oxidoreductase(peroxidase,oxidase,and catalase)-mimicking nanozymes made of a gold nanoparticle core and a platinum shell,Prussian Blue,Mn_(2)O_(3) and CoO *** were made with horseradish *** distinguished two main mechanisms of the negative impact of macromolecules on nanozyme catalysis—slowed diffusion and surface shielding of *** the first mechanism is typical for enzymes,the second one is specific only for *** the mechanisms is essential for developing approaches to reduce the unavoidable impact of macromolecules for various analytical and biomedical applications.

关键词： molecular crowding biosensors nanoparticles

Shell-model representations of the microscopic version of the Bohr-Mottelson collective model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第8期76卷 79-90页

作者： h g ganev Joint Institute for Nuclear Research DubnaRussia Institute of Mechanics Bulgarian Academy of SciencesSofiaBulgaria

The structure of the irreducible collective spaces of the group Sp(12,R),which many-particle nuclear states are classified according to the chain Sp(12,R)⊃U(6)⊃SO(6)⊃SU_(pn)(3)⊗SO(2)⊃SO(3)of the proton-neutron symplectic model(PNSM),is considered in *** chain of the PNSM was recently shown to correspond to a microscopic shell-model version of the Bohr-Mottelson collective *** construction of the relevant shell-model representations of the Sp(12,R)group along this chain is considered for three nuclei with varying collective properties and from different mass *** is shown that the SU_(pn)(3)basis states of the Sp(12,R)representations belonging to the SO(6)irreps with seniorityυ≥υ0,withυ0 denoting the maximal seniority SO(6)irrep contained in the Sp(12,R)bandhead,are always Pauli allowed,but organized in a different way into different SO(6)*** is in contrast to the case of filling the levels of the standard three-dimensional harmonic oscillator and using the plethysm *** the SU_(pn)(3)multiplets withinυhe present work are important for the practical application of the microscopic version of the Bohr-Mottelson collective model.

关键词： microscopic shell-model version of the Bohr-Mottelson model proton-neutron symplectic model Sp(12,R)dynamical algebra shell-model representations

Linear OPF-based Robust Dynamic Operating Envelopes with Uncertainties in Unbalanced Distribution Networks

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2024年第4期12卷 1320-1326页

作者： Bin liu Julio h.Braslavsky Nariman Mahdavi Energy Centre Commonwealth Scientific and Industrial Research Organisation(CSIRO)Newcastle 2300Australia the Network Planning Division TransgridSydney 2000Australia the Energy Systems Program Energy CentreCommonwealth Scientific and Industrial Research Organisation(CSIRO)Newcastle 2300Australia

Dynamic operating envelopes(DOEs),as key enablers to facilitate distributed energy resource(DER)integration,have attracted increasing attention in the past ***,uncertainties,which may come from load forecasting errors or inaccurate network parameters,have been rarely discussed in DOE calculation,leading to compromised quality of the hosting capacity allocation *** letter studies how to calculate DOEs that are immune to such uncertainties based on a linearised unbalanced three-phase optimal power flow(UTOPF)*** uncertain parameters constrained by norm balls,formulations for calculating robust DOEs(RDOEs)are presented along with discussions on their *** cases,including a 2-bus illustrative network and a representative Australian network,are tested to demonstrate the effectiveness and efficiency of the proposed approach.

关键词： Distributed energy resource(DER) dynamic operating envelope(DOE) feasible region robust optimisation uncertainty modelling unbalanced optimal power flow

Spontaneous Recovery in Directed Dynamical Networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Engineering 2024年第6期37卷 208-214页

作者： Xueming liu Xian Yan h.Eugene Stanley School of Artificial Intelligence and Automation&The MOE Engineering Research Center of Autonomous Intelligent Unmanned Systems&the Key Laboratory of Image Processing Huazhong University of Science and TechnologyWuhan 430074China Center for Polymer Studies Department of PhysicsBoston UniversityBostonMA 02215USA

Complex networked systems,which range from biological systems in the natural world to infrastructure systems in the human-made world,can exhibit spontaneous recovery after a failure;for example,a brain may spontaneously return to normal after a seizure,and traffic flow can become smooth again after a *** studies on the spontaneous recovery of dynamical networks have been limited to undirected ***,most real-world networks are *** fill this gap,we build a model in which nodes may alternately fail and recover,and we develop a theoretical tool to analyze the recovery properties of directed dynamical *** find that the tool can accurately predict the final fraction of active nodes,and the prediction accuracy decreases as the fraction of bidirectional links in the network increases,which emphasizes the importance of directionality in network *** to different initial states,directed dynamical networks may show alternative stable states under the same control parameter,exhibiting hysteresis *** addition,for networks with finite sizes,the fraction of active nodes may jump back and forth between high and low states,mimicking repetitive failure-recovery *** findings could help clarify the system recovery mechanism and enable better design of networked systems with high resilience.

关键词： Network resilience Directed dynamical networks Spontaneous recovery

Molecular identification and sequence analysis variability two mitochondrial DNA regions and internal transcribed spacer of rDNA for tapeworm parasites

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular identification and sequence analysis variability t...

Estimating Critical Clearing Time of grid Faults Using DA of State-Reduction Model of Power Systems

中国畜牧兽医学会家畜寄生虫学分会第六次代表大会暨第十次学术研讨会

作者： R.S.Dai~(1,2),g.h.liu~(1,2),W.liu~2,Y.liu~(1*),X.Q.Zhu~(1**) (1.College of Veterinary Medicine,South China Agricultural University,guangzhou,guangdong province 510642, PR China 2.College of Veterinary Medicine,hunan Agricultural University,Changsha 410128,hunan province,PR China)

Sequence variability in two mitochondrial DNA(mtDNA) regions and internal transcribed spacer of rDNA, namely cytochrome c oxidase subunit 1(cox1) and NADh dehydrogenase subunit 4(nad4),among and within tapeworm,***,***,*** and *** from different geographical origins was examined by a mutation scanning approach.A portion of the cox1 gene(pcox1),nad4 genes(pnad4) and ITS were amplified separately from individual tapeworm by polymerase chain reaction(PCR).Representative samples displaying sequence variation were subjected to sequencing in order to define genetic markers for their specific identification and *** the intra-specific sequence variations within each of the four tapeworm species were 0-0.7% for pcox1,0-1.7%for pnad4 and 0.1-3.6%for ITS,the inter-specific sequence differences were significantly higher,being 12.1-17.6%for pcox1,18.7-26.2%for pnad4 and 31-75.5%for ITS,*** analy- ses based on the combined sequences of peox1 and pnad4 revealed that the recently described species *** was more closely related to *** than to *** findings provided mtDNA evidence for the validity of *** and also demonstrated clearly the usefulness and attributes of the mutation scanning-sequencing approach for studying the population genetic structures of these and other tapeworm of socio-economic importance.

关键词： genetic variation Mitochondrial DNA(mtDNA) Internal transcribed spacer Ribosomal DNA Tapeworm

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2024年第2期10卷 807-820页

作者： Yang liu Zhongyang Chen huanjin Yao Lin Yi Q.h.Wu School of Electric Power Engineering South China University of TechnologyGuangzhou 510640China China Southern Power grid Research Institute Guangzhou 510663China

This paper proposes a critical clearing time (CCT) estimation method by the domain of attraction (DA) of a state-reduction model of power systems using sum of squares (SOS) programming. By exploiting the property of the Jacobian matrix and the structure of the boundary of the DA, it is found the DA of the state-reduction model and that of the full model of a power system are topological isomorphism. There are one-to-one correspondence relationships between the number of equilibrium points, the type of equilibrium points, and solutions of the two system models. Based on these findings, an expanding interior algorithm is proposed with SOS programming to estimate the DA of the state-reduction model. State trajectories of the full model can be transformed to those of the state-reduction model by orthogonal or equiradius projection. In this way, CCT of a grid fault is estimated with the DA of the state-reduction model. The calculational burden of SOS programming in the DA estimation using the state-reduction model is rather small compared with using the full model. Simulation results show the proposed expanding interior algorithm is able to provide a tight estimation of DA of power systems with higher accuracy and lower time costs.

关键词： Critical clearing time domain of attraction expanding interior algorithm state-reduction model SOS programming

PCR tools for the verification of the specific identity of tapeworm from dogs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

PCR tools for the verification of the specific identity of t...

Microstructure evolution and shape memory behaviors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading with different prestrain levels

中国畜牧兽医学会家畜寄生虫学分会第六次代表大会暨第十次学术研讨会

作者： R.S.Dai~(1,2),g.h.liu~(1,2),R.Q.Lin~1,h.Q.Song~1,W.liu~2,Y.liu~(2*),X.Q.Zhu~(1**) (1.College of Veterinary Medicine,South China Agricultural University,guangzhou,guangdong province 510642, PR China 2.College of Veterinary Medicine,hunan Agricultural University,Changsha 410128,hunan province,PR China)

Based on the sequences of the internal transcribed spacers(ITS-1 and ITS-2) and mitochondrial (cox1) of DNA(rDNA) of tapeworm samples,specific forward primers were designed in the ITS-1 and cox1 for each of the tapeworm samples of *** primers were used individually together with a conserved primer in the large subunit of rDNA to amplify partial ITS-1 and/or ITS-2 of rDNA from 29 DNA samples from tapeworm samples from *** approach allowed their specific identification,with no amplicons being amplified from heterogeneous DNA samples,and sequencing confirmed the identity of the sequences *** PCR assays should provide useful tools for the diagnosis and molecular epidemiological investigations of tapeworm.

关键词： Internal transcribed spacers(ITS) Polymerase chain reaction(PCR) tapeworm dog

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第4期171卷 80-93页

作者： Y.h.Zhang h.Li Z.W.Yang X.liu Q.F.gu State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of high-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi’an 710072China

Ni_(47)Ti_(44)Nb_(9)shape memory alloy(SMA)is a promising material in the aerospace field due to its wide transformation *** application of shape memory effect depends on multistep thermomechan-ical loading,viz.,low-temperature deformation and subsequent heating to ***-temperature deformation prestrain plays a pivotal role in shape memory properties tailoring of SMA ***,microstructure evolution and deformation mechanisms of Ni_(47)Ti_(44)Nb_(9)SMA subjected to vari-ous prestrain levels are still *** this end,microstructure evolution and shape memory behaviors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading with prestrain levels of 8%-16%at-28℃(M_(s)+30℃)were *** results demonstrate that the stress-strain curve of the specimen exhibits four distinct stages at a maximal prestrain of 16%.Whereas stageⅡand stageⅢend at prestrains of∼8%and∼12%,*** stageⅡ,the stress-induced martensitic transformation is accompanied by the dislocation slip of the NiTi matrix andβ-Nb *** stageⅢ,in addition to the higher density of dislocations and further growth of stress-induced martensite variants(SIMVs),(001)compound twins are introduced as a result of the(001)deformation twinning in stress-induced ***{20-1}martensite twins are gradually introduced in stageⅣ.Correspondingly,after subsequent unloading and heating,a higher density of{114}austenite twins form in the specimen with a larger prestrain of 16%.With increasing prestrain from 8%to 16%,the recoverable strainε_(re)^(T)upon heating increases first and then ***ε_(re)^(T)obtains a maximum of 7.03%at 10%prestrain and de-creases to 6.17%at 16%*** increase ofε_(re)^(T)can be attributed to the formation of new SIMVs,the further growth of existing SIMVs,and the recoverable(001)compound *** the decrease ofε_(re)^(T)is mainly associated with the irrecoverable strain by{20−1}martensite *** effe

关键词： Ni_(47)Ti_(44)Nb_(9)shape memory alloy Wide transformation hysteresis Thermomechanical loading Microstructure evolution Shape memory behaviors Stress-induced martensitic transformation Deformation twinning