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Confinement-induced modulation of elastic properties of nano-confined fluids in slit pore

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Chinese Physics B 2019年第3期28卷 291-299页

作者： Zong-Li Sun Yan-Shuang kang Yan-mei kang Science and Technology College North China Electric Power University College of Science Hebei Agricultural University University of International Relations

Based on statistical mechanics for classical fluids, the general expressions for the elastic moduli of inhomogeneous fluid are derived and expressed as functionals of density functions. Within the framework of classical density functional theory, the bulk modulus of confined argon in slit pore is calculated under different conditions. The effects of vapor pressure, temperature, and pore width on modulus are calculated and investigated. Obvious confinement-induced effect has been observed in the confined argon. In addition, the solvation pressure dependence of the bulk modulus is also investigated,and the results suggest that the Tait–Murnaghan equation is still valid for the confined fluids.

关键词： elastic modulus confinement-induced modulation confined argon density functional

Relationship between the Virtual Dynamic Thinning Line and the Self-Thinning Boundary Line in Simulated Plant Populations

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Journal of Integrative Plant Biology 2008年第3期50卷 280-290页

作者： kang Chen Hong-mei kang Juan Bai Xiang-Wen Fang Gang Wang Key Laboratory of And and Grassland Ecology Lanzhou University Ministry of Education Lanzhou 730000 China

The self-thinning rule defines a straight upper boundary line on log-log scales for all possible combinations of mean individual biomass and density in plant populations. Recently, the traditional slope of the upper boundary line, -3/2, has been challenged by -4/3 which is deduced from some new mechanical theories, like the metabolic theory. More experimental or field studies should be carried out to identify the more accurate self-thinning exponent. But it＇s hard to obtain the accurate self-thinning exponent by fitting to data points directly because of the intrinsic problem of subjectivity in data selection. The virtual dynamic thinning line is derived from the competition-density （C-D） effect as the initial density tends to be positive infinity, avoiding the data selection process. The purpose of this study was to study the relationship between the virtual dynamic thinning line and the upper boundary line in simulated plant stands. Our research showed that the upper boundary line and the virtual dynamic thinning line were both straight lines on log-log scales. The slopes were almost the same value with only a very little difference of 0.059, and the intercept of the upper boundary line was a little larger than that of the virtual dynamic thinning line. As initial size and spatial distribution patterns became more uniform, the virtual dynamic thinning line was more similar to the upper boundary line. This implies that, given appropriate parameters, the virtual dynamic thinning line may be used as the upper boundary line in simulated plant stands.

关键词： area of suppression competition-density effect individual-based models self-thinning virtual dynamic thinning line

Hydrodynamic Stress Tensor in Inhomogeneous Colloidal Suspensions: an Irving-Kirkwood Extension

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Communications in Theoretical Physics 2019年第7期71卷 876-886页

作者： Zong-Li Sun Yan-Shuang kang Yan-mei kang Science and Technology College North China Electric Power UniversityBaoding 071051China College of Science Hebei Agricultural UniversityBaoding 071001China College of Chemistry and Environmentai Science Hebei UniversityBaoding 071001China University of International Relations Beijing 100091China

Based on statistical mechanics for classical fluids,general expressions for hydrodynamic stress in inhomogeneous colloidal suspension are derived on a molecular *** result is exactly an extension of the Iving-Kirkwood stress for atom fluids to colloidal suspensions where dynamic correlation *** is found that besides the inter-particle distance,the obtained hydrodynamic stress depends closely on the velocity of the colloidal particles in the suspension,which is responsible for the appearance of the solvent-mediated hydrodynamic *** to Brady’s stresslets for the bulk stress,our results are applicable to inhomogeneous suspension,where the inhomogeneity and anisotropy of the dynamic correlation should be taken into *** the near-field regime where the packing fraction of colloidal particles is high,our results can reduce to those of ***,our results are applicable to the suspensions with low,moderate,or even high packing fraction of colloidal particles.

关键词： hydrodynamic stress colloidal suspension diffusion hydrodynamic force

Effective Virtual Reality Based Building Navigation Using Dynamic Loading and Path Optimization

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International Journal of Automation and computing 2009年第4期6卷 335-343页

作者： Qing-Jin Peng Xiu-mei kang Ting-Ting Zhao Department of Mechanical and Manufacturing Engineering University of Manitoba Winnipeg R3T 5V6 Canada

Although computer capabilities have been improved significantly, a large-scale virtual reality （VR） system demands much more in terms of memory and computation than the current computer systems can offer. This paper discusses two important issues related to VR performance and applications in building navigation. These are dynamic loading of models based on cell segmentation for the optimal VR operation, and the route optimization based on path planning for easy navigation. The VR model of engineering and information technology complex （EITC） building at the University of Manitoba is built as an example to show the feasibility of the proposed methods. The reality, enhanced by three-dimensional （3D） real-time interactivity and visualization, leads navigators into a state of the virtual building immersion.

关键词： Virtual reality (VR) virtual environments (VEs) building navigation dynamic loading cell segmentation path planning

Persistent postoperative hypotension caused by subclinical empty sella syndrome after a simple surgery:A case report

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World Journal of Clinical Cases 2023年第24期11卷 5817-5822页

作者： kang-mei Zhao Jia-Sheng Hu Sheng-mei Zhu Ting-Ting Wen Xiang-Ming Fang Department of Anesthesiology The First Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhou 310003Zhejiang ProvinceChina Department of Anesthesiology Sanmen People’s HospitalSanmen 317100Zhejiang ProvinceChina

BACKGROUND Empty sella is an anatomical and radiological finding of the herniation of the subarachnoid space into the pituitary fossa leading to a flattened pituitary *** with empty sella may present with various symptoms,including headache due to intracranial hypertension and endocrine symptoms related to the specific pituitary hormones ***,we report a female patient who developed persistent postoperative hypotension caused by subclinical empty sella syndrome after a simple *** SUMMARY A 47-year-old woman underwent vocal cord polypectomy under general anesthesia with endotracheal *** denied any medical history,and her vital signs were normal before the *** and surgery were ***,she developed dizziness,headache and persistent hypotension in the ***,intravenous dopamine was started to maintain normal blood pressure,which improved her ***,she remained dependent on dopamine for over 24 h without any obvious anesthesia-and surgery-related *** endocrine etiology was then suspected,and further examination showed a high prolactin level,a low normal adrenocorticotropic hormone level and a low cortisol *** resonance imaging of the brain revealed an empty ***,she was diagnosed with empty sella syndrome and secondary adrenal *** symptoms disappeared one week later after daily glucocorticoid *** Endocrine etiologies such as pituitary and adrenal-related dysfunction should be considered in patients showing persistent postoperative hypotension when anesthesia-and surgery-related factors are excluded.

关键词： Empty sella syndrome Perioperative hypotension Secondary adrenal insufficiency Adrenocorticotropic hormone Cortisol Case report

SF/HGF-c-Met autocrine and paracrine promote metastasis of hepatocellular carcinoma

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World Journal of Gastroenterology 2001年第6期7卷 816-820页

作者： Qian Xie kang-Da Liu mei-Yu Hu kang Zhou Experimental Research Center of Zhongshan Hospital,Fudan University,Shanghai,200032,China Experimental Research Center of Zhongshan Hospital Fudan University Shanghai 200032 China.

AIM: To explore the role of SF/HGF-Met autocrine and paracrine in metastasis of hepatocellular carcinoma (HCC). METHODS: SF/HGF and c-met transcription and protein expression in HCC were examined by RT-PCR and Western Blot in 4 HCC cell lines, including HepG2, Hep3B, SMMC7721 and MHCC-1, the last cell line had a higher potential of metastasis. sf/hgf cDNA was transfected by the method of Lipofectin into SMMC7721. SF/HGF and c-met antibody were used to stimulate and block SF/HGF-c-met signal transduction. Cell morphology, mobility, and proliferation were respectively compared by microscopic observation, wound healing assay and cell growth curve. RESULTS: HCC malignancy appeared to be relative to its met-SF/HGF expression. In MHCC-1, c-met expression was much stronger than that in other cell lines with lower potential of metastasis and only SF/HGF autocrine existed in MHCC-1. After sf/hgf cDNA transfection or conditioned medium of MHCC-1 stimulation, SMMC7721 changed into elongated morphology, and the abilities of proliferation (P < 0.05) and mobility increased. Such bio-activity could be blocked by c-met antibody (P < 0.05). CONCLUSION: The system of SF/HGF-c-met autocrine and paracrine played an important role in development and metastasis potential of HCC. Inhibition of SF/HGF-c-met signal transduction system may reduce the growth and metastasis of HCC.

关键词： Autocrine Communication Carcinoma, Hepatocellular Hepatocyte Growth Factor Humans Liver Neoplasms Paracrine Communication Proto-Oncogene Proteins c-met Research Support, Non-U.S. Gov't Tumor Cells, Cultured

Slow Down Dewetting in Polymer Films by Isocyanate-treated Graphite Oxide

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Chinese Journal of Polymer Science 2018年第9期36卷 1070-1076页

作者： Yong Zhou Pei Bai Miao Huo Yu-Jie Chen Hua Li Hong-mei kang He-Zhou Liu Yun-Long Guo The State Key Lab of Metal Matrix Composites Shanghai Jiao Tong University School of Materials Science and Engineering Shanghai Jiao Tong University University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University

Isocyanate-treated graphite oxides （iGOs） were well-dispersed into the polystyrene （PS） thin films and formed a novel network structure. With control in fabrication, an iGOs-web layer was horizontally embedded near the surface of the films and thus formed a composite slightly doped by iGOs. This work demonstrated that the iGOs network can remarkably depress the dewetting process in the polymer matrix of the composite, while dewetting often leads to rupture of polymer films and is considered as a major practical limit in using polymeric materials above their glass transition temperatures （Tg）. Via annealing the 50-120 nm thick composite and associated neat PS films at temperatures ranging from 35℃ to 70 ℃ above Tg, surface morphology evolution of the films was monitored by atomic force microscopy （AFM）. The iGOs-doped PS exhibited excellent thermal stability, i.e., the number of dewetting holes was greatly reduced and the long-term hole growth was fairly restricted. In contrast, the neat PS film showed serious surface fluctuation and a final rupture induced by ordinary dewetting. The method developed in this work may pave a road to reinforce thin polymer films and enhance their thermal stability, in order to meet requirements by technological advances.

关键词： Dewetting Thin polymer films Thermal instability iGOs network

Linear response characteristics for subdiffusive Fokker-Planck equation systems and its application

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Linear response characteristics for subdiffusive Fokker-Plan...

Improvement of hydrogen isotope exchange reactions on Li_4SiO_4 ceramic pebble by catalytic metals

第三届海峡两岸动力学、振动与控制学术会议

作者： Yan-mei kang School of Mathematics and Statistics Xi'an Jiaotong University

A lot of physical, chemical and mechanical processes exhibit anomalous behavior in their transport and relaxation properties under the influence of an external field. When the external field is time independent, the time Fractional Fokker-Planck equation obtained as the continuous time limit of Continuous time random walk with long-tailed waiting time distribution, has proven to be a powerful tool

关键词： Linear response characteristics for subdiffusive Fokker-Planck equation systems and its application

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Chinese Chemical Letters 2012年第8期23卷 936-940页

作者： Cheng Jian Xiao Chun mei kang Xiao Jun Chen Xiao Ling Gao Yang Ming Luo Sheng Hu Xiao Lin Wang Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China China Academy of Engineering Physics Mianyang 621900China

Li4SiO4 ceramic pebble is considered as a candidate tritium breeding material of Chinese Helium Cooled Solid Breeder Test Blanket Module （CH HCSB TBM） for the International Thermonuclear Experimental Reactor （ITER）. In this paper, LiaSiO4 ceramic pebbles deposited with catalytic metals, including Pt, Pd, Ru and Ir, were prepared by wet impregnation method. The metal particles on Li4SiO4 pebble exhibit a good promotion of hydrogen isotope exchange reactions in H2-D20 gas system, with conversion equilibrium temperature reduction of 200-300 ~C. The out-of-pile tritium release experiments were performed using 1.0 wt% Pt/Li4SiO4 and Li4SiO4 pebbles irradiated in a thermal neutron reactor. The thermal desorption spectroscopy shows that Pt was effective to increase the tritium release rate at lower temperatures, and the ratio of tritium molecule （HT） to tritiated water （HTO） of 1.0 wt% Pt/LiaSiO4 was much more than that of Li4SiO4, which released mainly as HTO. Thus, catalytic metals deposited on LiaSiO4 pebble may help to accelerate the recovery of bred tritium particularly in low temperature region, and increase the tritium molecule form released from the tritium breedin~ materials.

关键词： Lithium orthosilicate (Li4SiO4) Hydrogen isotope exchange reaction Catalytic metal Tritium