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Recent progress in China in the study of ocean's role in climate variation

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Acta Oceanologica sinica 2012年第2期31卷 1-8页

作者： lIU Qinyu zheng Xiaotong Physical Oceanography laboratory Ocean University of ChinaQingdao 266100China Key laboratory of Ocean-Atmosphere Interaction and Climate in Universities of shandong Ocean University of ChinaQingdao 266100China

Recent （2007-2010） research res.l.s about ocean＇s role in climate variation and change by Chinese scientists are highlighted. This paper reviews a majority contributions by Chinese scientists to the understanding of ocean variability and change. This paper starts with the res.l.s about the important role of the tropical Indian Ocean in interannual variation of the Asia summer monsoon, the effect of sea surface temperature （ssT） and freshwater flux on climate variability in the Pa- cific, and interannual variability research in other oceans. Then res.l.s about ocean dynamic and thermodynamic roles in decadal climate variation are reviewed. Finally, the res.l.s about, oceanic response to global warming are discussed, again showcasing ocean＇s important role in climate.

关键词： ocean dynamic interannual variation decadal variability climate change

ElECTRIC FIElD EFFECTs ON YOUNG's MOlUlUs OF NANOWIREs

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Acta Mechanica s.l.da sinica 2009年第6期22卷 511-523页

作者： Xiaojing zheng li Qiao Key laboratory of Mechanics on Western Disaster and Environment Ministry of Education PRC Department of Mechanics and Engineering Science College of civil Engineering and Mechanics Lanzhou University Lanzhou Gansu 730000 China

As an important component of nanodevices and nanomachine constructions, the mechanical performance of nanowires （NWs） has been a subject of intense research efforts due to gaining relevance in controlling functionality of nanoelectromechanical systems （NEMs）; meanwhile, one of the characteristics of the NEMs is the dependence of the functionality of the systems upon the applied electric field. The study of the electric effects on the Young＇s modulus of nanostructures is of certain usefulness in the design of NEMs and the precise measurement of mechanical properties of one-dimensional nanostructures. This paper reviews the origin of the size-dependence of the elastic property of NWs and the factors influencing the discrepancies and inconsistencies in the measured values of the Young＇s modulus for the NW, besides the surface effects, nonlinear effects, the electromechanical coupling effects as a possible effect responsible for the differences in quantitative and qualitative performance of the measured Young＇s modulus for the NWs versus the diameter are clarified.

关键词： nanowires Young's modulus molecular dynamics simulations continuum mechanics theory electric effects

Coarsening Behavior of Gamma Prime Precipitates in a Nickel Based single Crystal superalloy

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Journal of Materials science & Technology 2016年第2期32卷 172-176页

作者： s.Tang l.K.Ning T.Z.Xin Z.zheng University of Chinese Academy of sciences.Beijing 100049.China superalloy Division.Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

The γ/γ＇ microstructural evolution in a nickel based single crystal superalloy during load-free thermal exposure at 900 ℃ has been further investigated in this paper. The growth characteristics of γ＇ precipitates were discussed in detail. The generation of interfacial dislocations would accelerate the rate of coalescence in the dendrite arms. The average sizes of precipitates were used to compare interface with diffusion controlled growth mechanism and no mechanism seems obviously dominant, although the square rate law gives slightly better fit. The coarsening behavior may be controlled by diffusion through the ragged interface between the γ＇ precipitate and the y matrix.

关键词： single crystal superalloy Coarsening Interfacial dislocations Rate controlling mechanism

Constraining the Temperature-density Relation of the Inter-galactic Medium from Analytically Modeling lyαForest Absorbers

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Research in Astronomy and Astrophysics 2023年第4期23卷 72-84页

作者： li Yang zheng zheng T.-s.Kim shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China school of Astronomy and space sciences University of Chinese Academy of SciencesBeijing 100049China Department of Physics and Astronomy University of Utah115 S 1400 ESalt Lake CityUT 84112USA Department of Astronomy University of Wisconsin475 North Charter StreetMadisonWI 53706USA

The absorption by neutral hydrogen in the intergalactic medium(IGM)produces the lya forest in the spectra of *** lya forest absorbers have a broad distribution of neutral hydrogen column density N_(HⅠ) and Doppler b *** narrowest lya absorption lines(of lowest b)with neutral hydrogen column density above~10^(13)cm^(-2) are dominated by thermal broadening,which can be used to constrain the thermal state of the *** we constrain the temperature-density relation T=T0(ρ/■)γ^(-1) of the IGM at 1.6sing N_(HⅠ) and b parameters measured from 24 high-res.l.tion and high-signal-to-noise quasar spectra and by employing an analytic model to model the N_(HⅠ) -dependent low-b cutoff in the b *** each N_(HⅠ) bin,the b cutoff is estimated using two methods,one non-parametric method from computing the cumulative b distribution and a parametric method from fitting the full b *** find that the IGM temperature T0 at the mean gas densityρshows a peak of~1.5×10^(4) K at z~*** redshift higher than this,the indexγapproximately remains constant,and it starts to increase toward lower *** evolution in both parameters is in good agreement with constraints from completely different approaches,which signals that HeⅡreionization completes around z~3.

关键词： (galaxies:)intergalactic medium-(galaxies:)quasars absorption lines-radiation mechanisms thermal

An sm-Nd isotopic dating study of the Archean Kongling Complex in the Huangling area of the Yangtze Craton

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Chinese science Bulletin 1998年第14期43卷 1187-1191页

作者： ling, Wl Gao, s zheng, HF Zhou, l Zhao, ZB China Univ Geosci Fac Geosci Wuhan 430074 Peoples R China Peking Univ Dept Geol Beijing 100871 Peoples R China

sm Nd isotopic compositions of associated amphibolites, TTG gneisses and granitic gneisses from the Archean Kongling Complex of the Yangtze Craton, south China are systematically analyzed. The res.l.s show that the amphibolites and TTG gneisses have a similar age of ca. 2 700 Ma, which well agrees with zircon U Pb dating of previous studies. However, their ε Nd ( t ) are different, suggestive of possible dissimilarity in source composition.

关键词： Yangtze Craton Kongling Complex Archean high grade terrain sm Nd isotopic chronology crust mantle evolution.

CORBA-Based Discrete Event simulation system

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Journal of systems Engineering and Electronics 2001年第3期12卷 16-19页

作者： luo, J. zheng, s. Zhong, l. Duan, F. Neocomputer Research Xi'an Jiaotong University Xi'an 710049 China

The CORBA technique is an integration of the object-oriented conception and distributed computing technique. It can make the application within distributed heterogeneous environments reusable, portable and interoperable. The architecture of CORBA-based discrete event simulation systems is presented and the interface of distributed simulation objects (DsO) is defined in this paper after the DsO is identified and the synchronization mechanism among DsO is discussed.

关键词： Computational methods Computer architecture Computer simulation Computer software portability Computer software reusability Interfaces (computer) Interoperability Object oriented programming synchronization

Hippocampal neurogenesis and pro-neurogenic therapies for Alzheimer's disease

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Animal Models and Experimental Medicine 2022年第1期5卷 3-14页

作者： Jie zheng Department of Pharmacology Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of EducationKey Laboratory of Basic Pharmacology of Guizhou ProvinceZunyi Medical UniversityZunyiChina

Adult hippocampal neurogenesis(AHN)facilitates hippocampal circuits plasticity and regulates hippocampus-dependent cognition and ***,AHN malfunction has been widely reported in both human and animal models of Alzheimer's disease(AD),the most common form of dementia in the *** therapies including rescuing innate AHN,cell engraftment and glianeuron reprogramming hold great potential for compensating the neuronal loss and rewiring the degenerated neuronal network in AD,but there are still great challenges to be *** review covers recent advances in unraveling the involvement of AHN in AD and highlights the prospect of emerging proneurogenic remedies.

关键词： Alzheimer's disease cognitive deficit hippocampus neurogenesis pro-neurogenic therapy

Imaging and endoscopic tools in pediatric inflammatory bowel disease: What’s new?

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World Journal of Clinical Pediatrics 2024年第1期13卷 7-13页

作者： Alexandra s Hudson Ghassan T Wahbeh Hengqi Betty zheng Department of Pediatrics University of WashingtonSeattleWA 98109United States

Pediatric inflammatory bowel disease(IBD)is a chronic inflammatory disorder,with increasing incidence and prevalence *** have been recent advances in imaging and endoscopic technology for disease diagnosis,treatment,and *** ultrasound,including transabdominal,transperineal,and endoscopic,has been emerging for the assessment of transmural bowel inflammation and disease complications(e.g.,fistula,abscess).Aside from surgery,IBD-related intestinal strictures now have endoscopic treatment options including through-the-scope balloon dilatation,injection,and needle knife stricturotomy and new evaluation tools such as endoscopic functional lumen imaging *** transnas.l.endoscopy may have a role in patients with upper gastrointestinal Crohn’s disease or those with IBD with new upper gastrointestinal *** to dys.l.sia screening in pediatric patients with longstanding colonic disease or primary s.l.rosing cholangitis hold promise with the addition of virtual chromoendoscopy and ongoing research in the field of artificial intelligence-assisted endoscopic *** intelligence and machine learning is a rapidly evolving field,with goals of further personalizing IBD diagnosis and treatment s.l.ction as well as *** review summarized these advancements,focusing on pediatric patients with IBD.

关键词： Intestinal ultrasound Endoscopy Inflammatory bowel disease Pediatrics Imaging

Nucleoside modified mRNA-lipid nanoparticles as a new delivery platform for the repair of the injured spinal cord

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Neural Regeneration Research 2025年第8期20卷 2311-2312页

作者： Krisztián Pajer Tamás Bellák Antal Nógrádi Department of Anatomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary

spinal cord injury and treatment opportunities:The adult mammalian spinal cord has a very limited capacity for spontaneous regeneration due to various intrinsic molecular and cellular *** the spinal cord neurons have the capacity to regenerate their axons,the expression of growth inhibitory factors.l.ck or suppression of proper guidance cues,and profound inflammatory responses do not permit successful regeneration(Khyeam et al.,2021).

关键词： injured capacity modified