检索结果-南通市图书馆

Calculation of thermodynamic parameters of relaxation process using a microwave attenuation method

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 1997年第9期42卷 737-741页

作者： Wang, XB Chen, XG Hu, zd LANZHOU UNIV DEPT CHEMLANZHOU 730000PEOPLES R CHINA

THE method of determination of thermodynamic parameters of relaxation process——relax-ation time τ,enthalphy ΔH,entropy Δs and free energy δF——has been established *** mathematical models of the real and imaginary parts of dielectric con-stants ε’(ω,t),ε’’(ω,t)which are expressed by τ,ΔH,Δs and ΔF are first established.

关键词： relaxation process microwave attenuation thermodynamic parameters enthalphy entropy free energy.

The entropy production and circulation of diffusion processes on manifolds

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 1997年第12期42卷 982-985页

作者： Guo, MZ Qian, M Wang, zd Department of Mathematics Peking University Beijing China

IT is known that the irreversibility of a Markov chain can be characterized by its circulation（see ***.[1]）.In this note,an extension of Qian-Qian’s result on the circulation forMarkov chains to the case of diffusion processes on manifolds is *** is shown that theentropy production of a diffusion{xsub>tsub>}sub>t≥0sub> on a manifold M is represented as a linear sum of therotation numbers（circulation）of{xsub>tsub>}sub>t≥0sub> around some closed curves in M and the

关键词： entropy production circulation diffusion Brownian motion rotation number.

Influence of splanchnic vascular infusion on the content of endotoxins in plasma and the translocation of intestinal bacteria in rats with acute hemorrhage necrosis pancreatitis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2000年第4期6卷 577-580页

作者： Qin RY Zou sQ Wu zd Qiu FZ Tongji Med Univ Tongji Hosp Dept Surg Wuhan 430030 Hubei Province Peoples R China

The main reason for the death of the patient with acute hemorrhage necrosis pancreatitis (AHNP) is pancreatic infection and multi-organ failure caused by endotoxemia and intestinal bacterial translocation[1-7]. However, the pathogenesis of endotoxemia and intestinal bacterial translocation remains a question[8-10]; moreover, no effective method of prevention and cure for it has been found till now[11 -15] In the present study, we infused low dose dopamine and low molecular weight dextran through the catheters to abdominal aorta and portal vein, and observed its influence on the endotoxin concentration in plasma and the rate of translocation of intestinal bacteria in AHNP rats.

关键词： acute hemorrhage necrosis pancreatitis microcirculation/splanchnic organ endotoxins/plasma intestinal bacterial translocation

NATURAL　BOND　ORBITAL　ANALYsIs　OF　RED　ROUssINATE　AND　BLACK　ROUssINATE

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

Chinese Chemical Letters 1996年第5期7卷 467-470页

作者： Chen, zd Yi, XH Kong, XL Li, LM Lu, JX BEIJING UNIV DEPT CHEM STATE KEY LAB RARE EARTH MAT CHEM & APPLICAT BEIJING 100871 PEOPLES R CHINA CHINEsE ACAD sCI FUJIAN INST RES STRUCT MATTER STATE KEY LAB STRUCT CHEM FUZHOU 350002 PEOPLES R CHINA

Abstracts: In the purpose of study on the electronic structure feature for the activation center of the FeMo-cofactor of the nitrogenase as well as activation process of a dinitrogen molecule. the black Roussinate with an Fe4s3 cluster core is regarded as the first modeling complex .In this paper, natural bond orbitals for the cluster anions of the black Roussinate and the related redRoussinate are calculated on the basis of the first-order density matrixes obtained by the use of DV-Xα sCC method, leading to reasonable bonding patterns.

关键词：

Exercise preconditioning alleviates ischemia-induced memory deficits by increasing circulating adiponectin

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第5期20卷 1445-1454页

作者： Meifeng Zheng Borui Zhang sonata s Y Yau Kwok-Fai so Li Zhang Haining Ou Department of Rehabilitation Medicine Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Department of Rehabilitation Medicine The Fifth Clinical College of Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Key Laboratory of CNs Regeneration(Ministry of Education) Guangdong-Hong Kong-Macao Institute of CNS RegenerationJinan UniversityGuangzhouGuangdong ProvinceChina Department of Rehabilitation sciences The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina state Key Laboratory of Brain and Cognitive science Li Ka Shing Faculty of MedicineThe University of Hong KongHong Kong Special Administrative RegionChina Center for Exercise and Brain science School of PsychologyShanghai University of SportShanghaiChina Neuroscience and Neurorehabilitation Institute University of Health and Rehabilitation SciencesQingdaoShandong ProvinceChina

Cerebral ischemia is a major health risk that requires preventive approaches in addition to drug *** exercise enhances neurogenesis and synaptogenesis,and has been widely used for functional rehabilitation after *** this study,we determined whether exercise training before disease onset can alleviate the severity of cerebral *** also examined the role of exercise-induced circulating factors in these *** mice were subjected to 14 days of treadmill exercise training before surgery for middle cerebral artery *** found that this exercise pre-conditioning strategy effectively attenuated brain infarct area,inhibited gliogenesis,protected synaptic proteins,and improved novel object and spatial memory *** analysis showed that circulating adiponectin plays a critical role in these preventive effects of *** activation of adiponectin receptors by Adipo Ron mimicked the effects of exercise,while inhibiting receptor activation abolished the exercise *** summary,our results suggest a crucial role of circulating adiponectin in the effects of exercise pre-conditioning in protecting against cerebral ischemia and supporting the health benefits of exercise.

关键词： adiponectin cerebral ischemia exercise pre-conditioning hippocampus memory function middle cerebral artery occlusion prefrontal cortex synaptic proteins treadmill exercise

Identification of New Dominant-Negative Mutants of Anthrax Protective Antigen Using Directed Evolution

在线全文

学校读者我要写书评

暂无评论

Identification of New Dominant-Negative Mutants of Anthrax P...

Computer vision meets microfluidics: a label-free method for high-throughput cell analysis

2012年湖北生物产业发展高端论坛暨湖北省生物工程学会2012年度学术交流会

作者： Wu GB Feng CF Cao s Guo AZ Liu zd College of Plant science & Technology Huazhong Agricultural University state Key Laboratory of Agricultural Microbiology Huazhong Agricultural University

The anthrax toxin is composed of three proteins:protective antigen(PA),lethal factor(LF),and edema toxin(EF).The PA moiety carries EF and LF into the cytosol of mammalian cells via a mechanism that depends on the oligomerization of PA and transmembrane pore formation by the PA *** mutants of PA,termed dominant-negative(DN) mutants,can co-oligomerize with wild-type PA and disrupt the translocation ability of the ***,we constructed a PA mutant library by introducing random mutations into domain II of PA and screened three new DN mutants of PA:V377E,T380s,and *** the mutants inhibited the anthrax toxin action against sensitive cells.V377E had the strongest inhibitory effect and was further confirmed to be able to protect mice against a challenge with anthrax lethal ***,we functionally characterized these *** result showed that these mutations did not impair proteolytic activation or oligomer formation of PA, but impeded the prepore-pore conversion of the *** DN mutants of PA identified in our study may provide valuable information for elucidating the structure-function relationship of PA and for designing therapeutics for anthrax treatment.

关键词： Anthrax-Protective antigen-Dominant-negative mutant-Directed evolution

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

Microsystems & Nanoengineering 2023年第5期9卷 1-15页

作者： shizheng Zhou Bingbing Chen Edgar s.Fu Hong Yan state Key Laboratory of Marine Resource Utilization in south China sea Hainan UniversityHaikou 570228China Graduate school of Computing and Information science University of PittsburghPittsburghPA 15260USA

In this paper,we review the integration of microfluidic chips and computer vision,which has great potential to advance research in the life sciences and biology,particularly in the analysis of cell imaging *** chips enable the generation of large amounts of visual data at the single-cell level,while computer vision techniques can rapidly process and analyze these data to extract valuable information about cellular health and *** of the key advantages of this integrative approach is that it allows for noninvasive and low-damage cellular characterization,which is important for studying delicate or fragile microbial *** use of microfluidic chips provides a highly controlled environment for cell growth and manipulation,minimizes experimental variability and improves the accuracy of data *** vision can be used to recognize and analyze target species within heterogeneous microbial populations,which is important for understanding the physiological status of cells in complex biological *** hardware and artificial intelligence algorithms continue to improve,computer vision is expected to become an increasingly powerful tool for in situ cell *** use of microelectromechanical devices in combination with microfluidic chips and computer vision could enable the development of label-free,automatic,lowcost,and fast cellular information recognition and the high-throughput analysis of cellular responses to different compounds,for broad applications in fields such as drug discovery,diagnostics,and personalized medicine.

关键词： fluid analysis enable

Time-varying nonlinear dynamics of a deploying piezoelectric laminated composite plate under aerodynamic force

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 Mechanica sinica 2018年第2期34卷 303-314页

作者： s.F.Lu W.Zhang X.J.song College of science Inner Mongolia University of Technology College of Mechanical Engineering Beijing University of Technology

Using Reddy’s high-order shear theory for laminated plates and Hamilton’s principle, a nonlinear partial differential equation for the dynamics of a deploying cantilevered piezoelectric laminated composite plate, under the combined action of aerodynamic load and piezoelectric excitation, is introduced. Two-degree of freedom(DOF)nonlinear dynamic models for the time-varying coefficients describing the transverse vibration of the deploying laminate under the combined actions of a first-order aerodynamic force and piezoelectric excitation were obtained by selecting a suitable time-dependent modal function satisfying the displacement boundary conditions and applying second-order discretization using the Galerkin method. Using a numerical method, the time history curves of the deploying laminate were obtained, and its nonlinear dynamic characteristics,including extension speed and different piezoelectric excitations, were studied. The results suggest that the piezoelectric excitation has a clear effect on the change of the nonlinear dynamic characteristics of such piezoelectric laminated composite plates. The nonlinear vibration of the deploying cantilevered laminate can be effectively suppressed by choosing a suitable voltage and polarity.

关键词： Deploying piezoelectric laminated composite plate Time-varying nonlinear dynamics Third-order shear deformation plate theory Time-dependent modal function Aerodynamic force

Gap solitons of spin–orbit-coupled Bose–Einstein condensates in PT periodic potential

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第1期31卷 140-145页

作者： s Wang Y H Liu T F Xu Hebei Key Laboratory of Microstructural Material Physics School of ScienceYanshan UniversityQinhuangdao 066004China school of science Yanshan UniversityQinhuangdao 066004China

We numerically investigate the gap solitons in Bose–Einstein condensates(BECs)with spin–orbit coupling(sOC)in the parity–time(PT)-symmetric periodic *** find that the depths and periods of the imaginary lattice have an important influence on the shape and stability of these single-peak gap solitons and double-peak gap solitons in the first band *** dynamics of these gap solitons are checked by the split-time-step Crank–Nicolson *** is proved that the depths of the imaginary part of the PT-symmetric periodic potential gradually increase,and the gap solitons become *** the different periods of imaginary part hardly affect the stability of the gap solitons in the corresponding parameter interval.

关键词： gap solitons spin–orbit coupling PT-symmetric periodic potential

同方期刊数据库