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Comparative study of bacterial status from conjunctival sac of the elder qiang minority and Han people with dry eye in Sichuan,China

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International Journal of Ophthalmology(English edition) 2012年第3期5卷 343-347页

作者： Yue zhang, kui Cao Department of Ophthalmology Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital Chengdu 610072 Sichuan Province China Mianyang Wanjiang Ophthalmologic Hospital Mianyang 621000 Sichuan Province China Department of Clinical Laboratory Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital Chengdu 610072 Sichuan Province China Hospital of Traditional Chinese Medclicine Affiliated to Luzhou Medical College Luzhou 646000 Sichuan ProvinceChina The Fourth People's Hospital of Zigong City. Zigong 643000 Sichuan Province China

AIM: To compare the status of bacteria in the conjunctival sac from the elder qiang minority and Han people with dry eyes in Sichuan, China. METHODS: Total of 54 elder qiang people with dry eyes (108 eyes) were examined by cluster sampling. In the similar habitation region of Han people, 80 (160 dry eyes) Han people were analyzed as the control group. The bacteria was separated from the inferior palpebral conjunctiva, then inoculated on blood plate for 48 hours and identified. RESULTS: Totally 24 strains of bacteria were cultured in either qiang minority or Han c populations with 3 strains of them existed in both ethnic groups. The commonest bacteria in conjunctival sac in two ethnic groups were non-pathogenic bacterium. The composition of Corynebacterium in Han people (54.1%) was significantly higher than that in qiang minority (27.4%) (chi(2)=11.6721, P=0.0006). The percentage of Sphingomonas Paucimobilis in qiang people was higher than that in Han people (chi(2)=18.6442, P=0.0000). However, there was no significant difference between qiang minority and Han people either in bacterial positive rate in conjunctival sac, or the composition of bacteria species and strains, or the composition of staphylococcus epidemids between two ethnic populations. CONCLUSION:There was no significant difference of bacterial positive rate in conjunctival sac from the elder of qiang minority and Han people with dry eye, but the species of bacteria were different.

关键词： conjunctival sac bacteria dry eye

Future penetration and impacts of electric vehicles on transport energy consumption and CO_2 emissions in different Chinese tiered cities

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Science China(Technological Sciences) 2018年第10期61卷 1483-1491页

作者： zhang qian OU XunMin zhang XiLiang China Automotive Energy Research Center (CAERC) Tsinghua University

This study focuses on the penetration of electric vehicles(EVs) within the private passenger vehicle market in selected Chinese cities categorized into different tiers. It presents an analysis of factors driving the market diffusion of EVs and the reasons for varying results across the investigated cities and provides estimates of related EV impacts on local energy consumption and CO_2 emissions. A nested multinomial model incorporating technological attributes of vehicles, energy prices, charging conditions,and incentive policies was developed for conducting a scenario analyses covering six cities. The results indicated that in a stagnation scenario in which policy support was absent, the market share of electric vehicles would be less than 7% in all six cities under investigation by 2030. In medium growth and rapid growth scenarios, the market share of EVs across the six cities was projected to be within the ranges of 29%–68% and 49%–80%, respectively. The impacts of EVs on gasoline demand depended not just on their cumulative sales but also on the share of electrified vehicle distance, and the CO_2 emission reduction effect was influenced by local EV stocks and the mix of local electricity sources. Battery costs, charging conditions, and energy prices were primary driving factors. Charging conditions and energy prices were key reasons for differences in the penetration curves among cities. These driving factors were further affected by differences in local income levels, housing and parking conditions, and availability of land resources. Subsidies were found to be effective in the short term, whereas in the medium term,tax breaks could serve as the main monetary incentive. In the long term, national policy should focus on technology-related R&D, whereas local policies should focus on the operational phase and be tailored to specific local situations.

关键词： clean vehicles electric vehicle penetration CO2 emissions China

Phase Separation of Polymer Blends Induced by an External Static Electric Field

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Chinese Journal of Polymer Science 2023年第6期41卷 972-980,I0011页

作者： qian zhang Xue-Hao He Department of Chemistry School of ScienceTianjin UniversityTianjin 300350China

The mechanism of the phase separation of polymer blends in the presence of a static electric field was investigated using the molecular dynamics with a modified coarse-grained polarizable *** electric field effects,i.e.,the promotion and hindrance of the phase separation,were found in the system of the upper critical solution temperature(UCST)by varying the dielectric properties of polymer *** simulation directly demonstrated that the electric field effects originate from the energy changes of intramolecular unit polarization,intermolecular van der Waals(VDW)and Coulomb interactions induced by the external electric *** relationship of the energy change and the dielectric constant for the system under electric field is *** interface orientation under electric field was found to happen even before the transition point of phase *** assuming that the relative order parameter of the phase separation undergoes the same fluctuations for a system with and without an electric field,the transition temperature under an electric field can be predicted,and quantitative consistency with simulations is obtained.

关键词： field. separation system

Fabrication and characterization of in situ AlN–TiN/Al composite ribbons

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Rare Metals 2015年第9期34卷 645-649页

作者： kui Wang Chun-Xiang Cui qian Wang Qing-Zhou Wang Hao Wang School of Materials Science and Engineering Hebei University of Technology Key Laboratory for New Type of Functional Materials Hebei University of Technology

The conventional wisdom is that the distribution and sizes of reinforcements, as well as the bonding strength of the matrix–reinforcement interface tend to be the crucial factors in determining the resulting properties of composites: the optimum mechanical properties are likely to be achieved when fine and thermally stable reinforcing particles are homogeneously distributed in a metal *** this study, in situ AlN–TiN/Al composite ribbons were successfully synthesized through plasma jet and subsequent melt-spinning method. The distribution and sizes of the particles in the ribbon were systematically *** average grain sizes of AlN and TiN in the AlN–TiN/Al composite ribbon are determined to be 27.7 and 29.6 nm,respectively. Moreover, analysis by scanning electron microscopy(SEM) results reveal that, compared with the AlN–TiN/Al bulk composite, particles like AlN and TiN could be far more homogeneously distributed in the matrix of the ribbon counterpart. In addition, the reinforcing effect of in situ nanoparticles, including AlN and TiN, was discussed as well.

关键词： Melt-spinning Reinforcing effect Nanoparticles

The YNEV stellar evolution and oscillation code

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Research in Astronomy and Astrophysics 2015年第4期15卷 549-568页

作者： qian-Sheng zhang Yunnan Observatories Chinese Academy of Sciences Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of Sciences

We have developed a new stellar evolution and oscillation code YNEV, which calculates the structures and evolutions of stars, taking into account hydrogen and helium burning. A nonlocal turbulent convection theory and an updated over- shoot mixing model are optional in this code. The YNEV code can evolve low- and intermediate-mass stars from the pre-main sequence to a thermally pulsing asymptotic branch giant or white dwarf. The YNEV oscillation code calculates the eigenfrequen- cies and eigenfunctions of the adiabatic oscillations for a given stellar structure. The input physics and numerical scheme adopted in the code are introduced. Examples of solar models, stellar evolutionary tracks of low- and intermediate-mass stars with different convection theories （i.e. mixing-length theory and nonlocal turbulent con- vection theory）, and stellar oscillations are shown.

关键词： stars -- stellar structure -- stellar evolution -- stellar oscillations

Neck-spinning quality analysis and optimization of process parameters for plunger components:Simulation and experimental study

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Chinese Journal of Aeronautics 2021年第4期34卷 174-191页

作者： Yang WANG Honghua SU Ning qian kui LIU Jianbo DAI Zhengcai ZHAO Wenfeng DING College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Singapore Institute of Manufacturing Technology 73 Nanyang DriveSingapore 637662Singapore School of Mechatronic Engineering China University of Mining and TechnologyXuzhou 221116China

The plunger component is a key part of the plunger pump in the aircraft hydraulic ***-spinning process is commonly used to fabricate plunger components,of which the quality of the spinning process significantly affects the performance of plunger *** of the bottlenecks faced by the industry in the spinning process is to choose a suitable neck-spinning process so as to ensure the quality of plunger *** is necessary to propose a reliable method to optimize the process parameters which affect the neck-spinning quality of plunger *** this study,a calculable finite element analysis(FEA)model is established to simulate the threeroller neck-spinning process of the plunger component,which includes six typical slipper structures,two roller structures,and two spinning *** FEA model is then validated by comparing the simulated spinning forces with the corresponding experimental *** influence of the process conditions on the neck-spinning quality is *** the orthogonal simulation results are analyzed by a combination of range method and fuzzy mathematical analysis method to recommend a reasonable slipper structure,roller structure and neck-spinning *** study provides a promising method to improve the manufacturing quality of the typical plunger components.

关键词： Fuzzy method Neck-spinning quality Plunger component Range analysis Simulation

A Higher-Dimensional Hirota Condition and Its Judging Method

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Communications in Theoretical Physics 2008年第1期49卷 27-30页

作者： GUO Fu-kui zhang Yu-Feng Information School Shandong University of Science and Technology Qingdao 266510 China

When a one-dimensional nonlinear evolution equation could be transformed into a bilinear differential form as F（Dt, Dx）f . f = O, Hirota proposed a condition for the above evolution equation to have arbitrary N-soliton solutions, we call it the 1-dimensional Hirota condition. As far as higher-dimensional nonlinear evolution equations go, a similar condition is established in this paper, also we call it a higher-dimensional Hirota condition, a corresponding judging theory is given. As its applications, a few two-dimensional KdV-type equations possessing arbitrary N-soliton solutions are obtained.

关键词： Hirota condition KdV equation soliton solution

Integrable Coupling of KN Hierarchy and Its Hamiltonian Structure

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Communications in Theoretical Physics 2006年第5期45卷 799-801页

作者： GUO Fu-kui zhang Yu-Feng Information School Shandong University of Science and Technology Qingdao 266510 China

The Hamiltonian structure *** integrable couplings obtained by our method has not been solved. In this paper, the Hamiltonian structure of the KN hierarchy is obtained by making use of the quadratlc-form identity.

关键词： integrable coupling KN hierarchy Hamiltonian structure quadratic identity

Two Types of New Solutions to KdV Equation

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Communications in Theoretical Physics 2006年第4X期46卷 577-579页

作者： GUO Fu-kui zhang Yu-Feng Information School Shandong University of Science and Technology Qingdao 266510 China Mathematical School Liaoning Normal University Dalian 116029 China

It is common knowledge that the soliton solutions u（x, t） defined by the bell-shape form is required to satisfy the following condition lira u（x, t） = u（±∞, t） = 0. However, we think that the above condition can be modified as lim u（x, t） = u（±∞, t）^x→ = c, where c is a constant, which is called as a stationary height of u（x, t） in the present paper.^x→∞ If u（x, t） is a bell-shape solitary solution, then the stationary height of each solitary wave is just c. Under the constraint c = 0, all the solitary waves coming from the N-bell-shape-sollton solutions of the KdV equation are the same-oriented travelling. A new type of N-soliton solution with the bell shape is obtained in the paper, whose stationary height is an arbitrary constant c. Taking c ≥ 0, the resulting solitary wave is bound to be the same-oriented travelling. Otherwise, the resulting solitary wave may travel at the same orientation, and also at the opposite orientation. In addition, another type of singular rational travelling solution to the KdV equation is worked out.

关键词： soliton solution Hirota method bilinear differential equation