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Journal of Hainan Medical University 2020年第17期26卷 6-9页

作者： Xiang-Lai Liu zhan Lin Hong Zhu da-fei zhan Tian-Ming Han Qian-Kun Yao Anning Hospital of Hainan Province Haikou Hainan 570206

Objective:To analyze the mental health status of Hainan Provincial medical staff who aided Hubei Province to combat ***:The Self-Rating Anxiety Scale(SAS),Self-Rating Depression Scale(SDS),Self-Reporting Questionnaire-20(SRQ-20)and PTSD Checklist-Civilian Version(PCL-C)were used to evaluate the mental health status of 243 medical staff who aided Hubei Province to combat ***:A total of 221 persons have completed the psychological *** survey showed that 9.05%of the medical staff had different degrees of anxiety,16.29%had different degrees of depression,13.12%were abnormal in Self-Reporting Questionnaire-20,and 9.05%were abnormal in PTSD Checklist-Civilian *** were difference in scores of Self-Rating Depression Scale across different genders,age groups,profession and educational levels,But Regression analysis rejects the ***:The mental health status of Hainan Provincial medical staff who aided Hubei Province to fight against COVID-19 was abnormal,regardless of gender,age,profession or education *** measures at an early stage are warranted to alleviate the psychological problems.

关键词： COVID-19 Aid Hainan Province Medical staff Mental health Survey

Adsorption Behavior of CH2 and CH3 on Metal Clusters CUn （n=1-6）

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Chinese Journal of Chemical Physics 2008年第5期21卷 445-450页

作者： Xi-hui Cheng Ming-xing Jin zhan Hu fei-fei Hu da-jun Ding Institute of Atomic and Molecular Physics Jilin University Changchun 130012 China

Using density functional theory with generalized gradient approximation and hybrid functional, we studied the properties of energy, charge population, and vibration of CH2 and CH3 adsorbed on Cun （n=1-6） clusters. The results show that the DFT calculation with the hybrid functional matches the experimental results better in both cases. The calculation results indicate that the adsorption of CH2 is stronger than that of CH3. During adsorption, the charges transfer from Cu to CH2 or CH3. The obtained vibrational frequencies for different modes of CH2 and CH3 adsorbed on Cun agree well with the experimental results for the adsorption on Cu（111） surface.

关键词： Adsorption CH2 CH3 Cu cluster

Breakthrough in Li-mediated continuous electrosynthesis of ammonia

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Science China Chemistry 2024年第10期67卷 3191-3192页

作者： fei zhan Chang Yu State Key Laboratory of Chemical Resource Engineering College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China State Key Laboratory of Fine Chemicals Liaoning Key Lab for Energy Materials and Chemical EngineeringSchool of Chemical EngineeringDalian University of TechnologyDalian 116024China

Ammonia(NH3)ranks among the manufactured chemicals,with an annual production surpassing 182 million tons[1],which is an indispensable raw material for fertilizer industry and has been recognized as a promising carbon-... 详细信息

关键词： ammonia Ammonia suppl

Radical-Mediated Selective Functionalization of Unactivated Primary C-H Bonds

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Chinese Journal of Chemistry 2022年第14期40卷 1751-1753页

作者： zhan-Lin Wang fei Wang State Key Laboratory of Elemento-Organic Chemistry College of ChemistryNankai UniversityTianjin 300071China

Radical-mediated sp^(3)C—H functionalization has found broad applications in synthesis and late-stage derivatization of complex *** site-selectivity of a given reaction is mainly dictated by the bond strength,polarity and steric accessibility of diverse C—H bonds as well as the characters of hydrogen atom *** sp^(3)C—H bonds usually follow the relative reactivity sequence of tertiary>secondary>primary,which is even recognized as the innate preferences of certain *** development of innovative methods capable of overriding the“inherent”site-selectivity is exceedingly *** it has been demonstrated that secondary C—H bonds could be selectively converted in the presence of weaker tertiary C—H bonds by tuning the steric and electronic properties of hydrogen atom acceptors,the selective activation of primary C—H bonds remains a daunting ***,we highlight the recently emerging attempts towards this goal by interrogating the steric effect of hydrogen atom acceptors.

关键词： C-H activation Hydrogen atom transfer Radical reactions Regioselectivity Steric hindrance

Regulation of Tumor Microenvironment Under Malignant Conditions:Application of nMOFs in Sonodynamic Therapy

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Chemical Research in Chinese Universities 2024年第4期40卷 611-626页

作者： YANG Yilin YAN fei SHI zhan State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun130012P.R.China

In this review,we delve into the intricate regulation of the tumor microenvironment(TME)under malignant conditions and explore the transformative potential of nanoscale metal-organic frameworks(nMOFs)in the realm of sonodynamic therapy(SDT).The TME serves as a dynamic milieu influencing tumor progression and therapeutic response,presenting formidable challenges,such as hypoxia,acidity,excess hydrogen peroxide,high expression of glutathione,and *** the exceptional attributes of nMOFs,including their tunable structures and biocompatibility,holds immense promise for enhancing SDT efficacy and reshaping the TME *** integrating nMOFs with SDT,researchers aim to assemble multiple functionalities in a single platform that enhance tumor cell eradication while counteracting unfavorable TME conditions and immune *** potential of nMOFs to revolutionize tumor therapies by precisely targeting TME and overcoming therapeutic barriers is underscored by an in-depth analysis of recent breakthroughs in the use of nMOFs-based sonosensitizers to remodulate TME to amplify the efficacy of SDT.

关键词： Sonodynamic therapy Metal-organic framework Tumor microenvironment Modification of sonosensitizer

Numerical Study on Scale Effect of Form Factor for DTMB5415, KCS,KVLCC2, and 4000TEU Container Ship

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China Ocean Engineering 2021年第5期35卷 767-778页

作者： WANG zhan-zhi MIN Shao-song PENG fei Department of Naval Architecture and Ocean Engineering Naval University of EngineeringWuhan 430033China

Four ships,a twin-propeller naval ship,two single-propeller container ships,and a single-propeller very large crude carrier(VLCC),were studied to investigate the scale effect of the form *** viscous flow fields of the ships at different scales were solved numerically via the Reynolds-averaged Navier–Stokes method combined with the shear stress transport k–ωturbulence *** numerical method was validated through comparisons with experimental data,and numerical uncertainty analysis was carried out based on the ITTC recommended *** this basis,scale effects of the form factor were analyzed using different friction lines,and scale effects of flow fields and the mean axial wake fractions were further analyzed in *** results showed that the form factor exhibited scale effects when adopting the ITTC-1957 line,and it increased with the increase in the Reynolds *** scale effect of the form factor reduces the prediction precision of the full-scale ship *** friction line has a significant effect on the form *** form factor exhibits little dependence on the Reynolds number when using the numerical friction line or the Katsui line,which is useful for full-scale ship resistance *** the increasing Reynolds number,the boundary layer thickness becomes thinner and the axial velocity contour contracts toward the center plane,and there is nearly a linear relationship between the reciprocal of mean axial wake fraction on propeller disc and Reynolds number in logarithmic scale for the three types of ship forms.

关键词： form factor scale effect ITTC-1957 line numerical calculation flow field

A new eremophilane-type sesquiterpene from Ligularia virgaurea

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Chinese Chemical Letters 2009年第8期20卷 949-951页

作者： Dong Qing fei zhan Xin zhang School of Pharmacy Lanzhou University Lanzhou 730000 China

A new eremophilane-type sesquiterpene, 1α,8β,10β-trihydroxy-6β-（2-methylacryloy1）0xyeremophil-7（11）-en-8a,12-oide,was isolated from the roots of Ligularia virgaurea. Its structure was established on the basis of various spectroscopic analyses, including the 1D, 2D NMR techniques and HR-ESI-MS.？ 2009 zhan Xin zhang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Ligularia virgaurea Compositae Eremophilane Sesquiterpene

Reconciling charmonium production and polarization data in the midrapidity region at hadron colliders within the nonrelativistic QCD framework

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Chinese Physics C 2018年第4期42卷 109-116页

作者： zhan Sun Hong-fei zhang School of Science Guizhou Minzu University Guiyang 500025 China Department of Physics School of Biomedical Engineering Third Military Medical University Chongqing 400038 China

A thorough study reveals that the only key parameter for ψ （J/ψ, ψ＇） polarization at hadron colliders is the ratio 〈Oψ（3S1[8]）〉/〈Oψ（3P0[8]）〉 angle, if the velocity scaling rule holds. A slight variation of this parameter results in substantial change of the ψ polarization. We find that with equally good description of the yield data, this parameter can vary significantly. Fitting the yield data is therefore incapable of determining this parameter, and consequently, of determining the ψ polarization. We provide a universal approach to fixing the long-distance matrix elements （LDMEs） for J/ψ and ψ＇ production. Further, with the existing data, we implement this approach, obtain a favorable set of the LDMEs, and manage to reconcile the charmonia production and polarization experiments, except for two sets of CDF data on J/ψ polarization.

关键词： J/ψ polarization nonrelativistic QCD long-distance matrix elements

An assessment of surrogate fuel using Bayesian multiple kernel learning model in sight of sooting tendency

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Frontiers in Energy 2022年第2期16卷 277-291页

作者： Lei ZHU zhan GAO Xiaogang CHENG fei REN Zhen HUANG Key Laboratory for Power Machinery and Engineering of the Ministry of Education Shanghai Jiao Tong UniversityShanghai 200030China

An integrated and systematic database of sooting tendency with more than 190 kinds of fuels was obtained through a series of experimental investigations. The laser-induced incandescence (LII) method was used to acquire the 2D distribution of soot volume fraction, and an apparatus-independent yield sooting index (YSI) was experimentally obtained. Based on the database, a novel predicting model of YSI values for surrogate fuels was proposed with the application of a machine learning method, named the Bayesian multiple kernel learning (BMKL) model. A high correlation coefficient (0.986) between measured YSIs and predicted values with the BMKL model was obtained, indicating that the BMKL model had a reliable and accurate predictive capacity for YSI values of surrogate fuels. The BMKL model provides an accurate and low-cost approach to assess surrogate performances of diesel, jet fuel, and biodiesel in terms of sooting tendency. Particularly, this model is one of the first attempts to predict the sooting tendencies of surrogate fuels that concurrently contain hydrocarbon and oxygenated components and shows a satisfying matching level. During surrogate formulation, the BMKL model can be used to shrink the surrogate candidate list in terms of sooting tendency and ensure the optimal surrogate has a satisfying matching level of soot behaviors. Due to the high accuracy and resolution of YSI prediction, the BMKL model is also capable of providing distinguishing information of sooting tendency for surrogate design.

关键词： sooting tendency yield sooting index Bayesian multiple kernel learning surrogate assessment surrogate formulation

A wide-field and high-resolution lensless compound eye microsystem for real-time target motion perception

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Microsystems & Nanoengineering 2022年第4期8卷 199-207页

作者： Li zhang Haiyang zhan Xinyuan Liu fei Xing Zheng You Department of Precision Instrument Tsinghua UniversityBeijing 100084China State Key Laboratory of Precision Measurement Technology and Instrument Tsinghua UniversityBeijing 100084China Beijing Advanced Innovation Center for Integrated Circuits Beijing 100084China

Optical measurement systems suffer from a fundamental tradeoff between the field of view(FOV),the resolution and the update rate.A compound eye has the advantages of a wide FOV,high update rate and high sensitivity to motion,providing inspiration for breaking through the constraint and realizing high-performance optical ***,most existing studies on artificial compound eyes are limited by complex structure and low resolution,and they focus on imaging instead of precise ***,a high-performance lensless compound eye microsystem is developed to realize target motion perception through precise and fast orientation *** microsystem splices multiple sub-FOVs formed by long-focal subeyes,images targets distributed in a panoramic range into a single multiplexing image sensor,and codes the subeye aperture array for distinguishing the targets from different sub-FOVs.A wide-field and high resolution are simultaneously realized in a simple and easy-to-manufacture microelectromechanical system(MEMS)aperture ***,based on the electronic rolling shutter technique of the image sensor,a hyperframe update rate is achieved by the precise measurement of multiple time-shifted spots of one *** microsystem achieves an orientation measurement accuracy of 0.0023°(3σ)in the x direction and 0.0028°(3σ)in the y direction in a cone FOV of 120°with an update rate~20 times higher than the frame *** study provides a promising approach for achieving optical measurements with comprehensive high performance and may have great significance in various applications,such as vision-controlled directional navigation and high-dynamic target tracking,formation and obstacle avoidance of unmanned aerial vehicles.

关键词： precise resolution compound