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Structural and elastic properties of Ce2O3 under pressure from LDA＋U method

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Frontiers of physics 2013年第4期8卷 405-411页

作者： yuan-yuan Qi Zhen-wei Niu Cal Cheng Yan Cheng Institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 China

We investigate the structural and elastic properties of hexagonal Ce2O3 under pressure using LDA＋U scheme in the frame of density functional theory （DFT）. The obtained lattice constants and bulk modulus agree well with the available experimental and other theoretical data. The pressure dependences of normalized lattice parameters a/ao and c/co, ratio c/a, and normalized primitive volume V/Vo of Ce2O3 are obtained. Moreover, the pressure dependences of elastic properties and three anisotropies of elastic waves of Ce2O3 are investigated for the first time. We find that the negative value of Ca4 is indicative of the structural instability of the hexagonal structure Ce2O3 at zero temperature and 30 GPa. Finally, the density of states （DOS） of Ce2O3 under pressure is investigated.

关键词： elastic properties high pressure density functional theory Ce2O3

HEF-19-induced relaxation of colonic smooth muscles and the underlying mechanisms

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World Journal of Gastroenterology 2013年第32期19卷 5314-5319页

作者： yuan-yuan wei Lu-Lu Sun Shou-Ting Fu Department of Pharmacy Beijing Shijitan HospitalCapital Medical University School of Life Science and Biopharmaceutics Shenyang Pharmaceutical University

AIM:To investigate the relaxant effect of chromane HEF-19 on colonic smooth muscles isolated from rabbits,and the underlying ***:The relaxant effect and action mechanisms of HEF-19 were investigated using descending colon smooth muscle of the *** 1 cm long were mounted in 15-mL tissue baths containing Tyrode’s solution,maintained at 37±0.5℃and aerated with a mixture of 5%CO2in oxygen(Carbogen).The tension and amplitude of the smooth muscle strips were recorded after adding HEF-19(10-6,10-5and 10-4mol/L).After cumulative administration of four antispasmodic agents,including acetylcholine chloride(Ach)(10-4mol/L),histamine(10-4mol/L),high-K+(60 mmol/L)and BaCl2(8.2 mmol/L),HEF-19(3×10-7-3×10-4mol/L)was added to investigate the relaxant effect of ***2(10-4-2.5×10-3mol/L)was added cumulatively to the smooth muscle preparations pretreated with and without HEF-19(1×10-6or 3×10-6mol/L)and verapamil(1×10-7mol/L)to study the mechanisms ***,phasic contraction was induced with ACh(15×10-6mol/L),and CaCl2(4×10-3mol/L)was added to the smooth muscle preparations pretreated with and without HEF-19(3×10-6mol/L or 1×10-5mol/L)and verapamil(1×10-7mol/L)in calcium-free medium to further study the underlying ***:HEF-19(1×10-6,1×10-5and 1×10-4mol/L)suppressed spontaneous contraction of rabbit colonic smooth ***-19(3×10-7-3×10-4mol/L)relaxed in a concentration-dependent manner colonic smooth muscle preparations pre-contracted with BaCl2,high-K+solution,Ach or histamine with respective EC50values of 5.15±0.05,5.12±0.08,5.58±0.16and 5.25±0.24,thus showing a spasmolytic ***-19(1×10-6mol/L and 3×10-6mol/L)shifted the concentration-response curves of CaCl2to the right and depressed the maximum response to *** two components contracted by Ach were attenuated with HEF-19(3×10-6mol/L or 10-5mol/L)in calcium-free ***:HEF-19 inhibited rabbit colonic smooth muscle contraction,probably through in

关键词： Colonic smooth muscle Smooth muscle relaxation Ca2+channels

Brugada syndrome associated with out-of-hospital cardiac arrest: A case report

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World Journal of Clinical Cases 2021年第19期9卷 5345-5351页

作者： Guo-Hua Ni Hua Jiang Li Men yuan-yuan wei Dila A Xiang Ma Sichuan Academy of Medical Sciences&Sichuan Provincial People's Hospital(Chengdu Jinjiang Sohome Comprehensive Outpatient Clinic) Chengdu 610072Sichuan ProvinceChina Department of Geriatrics Affiliated Hospital of Chengdu UniversityChengdu 610081Sichuan ProvinceChina Department of Cardiology First Affiliated Hospital of Xinjiang Medical UniversityUrumqi 830000Xinjiang Uygur Autonomous RegionChina Department of Physiology Basic Medicine CollegeChengdu UniversityChengdu 610106Sichuan ProvinceChina

BACKGROUND Brugada syndrome(BrS)is an inherited disease characterized by an electrocardiogram(ECG)with a coved-type ST-segment elevation in the right precordial leads(V1-V3),which predisposes to sudden cardiac death(SCD)due to polymorphic ventricular tachycardia or ventricular fibrillation in the absence of structural heart *** report the case of a 29-year-old man with out-ofhospital cardiac *** is associated with a high incidence of SCD in adults,and increasing the awareness of BrS and prompt recognition of the Brugada ECG pattern can be *** SUMMARY A 29-year-old man suffered from out-of-hospital cardiac arrest,and after defibrillation,his ECG demonstrated a coved-type elevated ST segment in V1 and *** findings were compatible with type 1 Brugada pattern,and ECG of his brother showed a type 2 Brugada *** diagnosis was BrS,NYHF IV,multiple organ dysfunction syndrome,sepsis,and hypoxic ischemic *** patient had no arrhythmia episodes after discharge throughout a follow-up period of 36 *** Increasing awareness of BrS and prompt recognition of the Brugada ECG pattern can be lifesaving.

关键词： Brugada syndrome Out-of-hospital cardiac arrest Electrocardiogram Ventricular fibrillation Family history Case report

Enhanced cycling stability and rate performance of Co-doped and La_(2)O_(3)-coated LiNi_(0.9)Mn_(0.1)O_(2) toward power battery

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Rare Metals 2024年第2期43卷 658-670页

作者： Jia-Qi Peng yuan-yuan wei Dong-Ming Liu Yun Li Bin Hu Bin Huang Jian-Wen Yang Shun-Hua Xiao Ren-Heng Wang Guangxi Key Laboratory of Electrochemical and Magneto-Chemical Functional Materials College of Chemistry and BioengineeringGuilin University of TechnologyGuilin541004China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen518060China

Ultra-high nickel layered oxide cathode material with high energy density is the most promising material to improve the electrochemical performance of lithium-ion batteries(LIBs).However,the poor structural stability and severe surface/interface side reactions of the material lead to poor rate performance and cyclic stability,which limits its application in *** this paper,the dual-modification strategy of Co doping and La_(2)O_(3) coating is used to meet the above *** doping can effectively widen layer spacing and reduce Li^(+)/Ni^(2+) mixing,and La_(2)O_(3) coating can effectively eliminate the residual alkali on the surface of active material,inhibit the thickening of cathode electrolyte interphase(CEI)film and reduce surface/interface side ***,the modified material(NM90-CL)with excellent electrochemical properties is achieved through the synergistic enhancement of Co doping and La_(2)O_(3) *** capacity retention rate can reach 77.9%after 200 cycles at 1.0℃ and 75.7%after 200 cycles at 5.0℃.Its reversible capacity can up to 153.5 mAh·g^(–1) at 10.0℃.This dual-modification strategy will provide theoretical guidance and technical support for the synthesis of other high-performance electrode materials.

关键词： High nickel cathode material Co doping La_(2)O_(3) coating Electrochemical performance Electrochemical mechanism

Optimized Controlling Strategies for Fermentation of Recombinant Saccharomyces cerevisiae

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Progress in Natural Science:Materials International 1993年第3期3卷 270-275页

作者： SHI yuan yuan wei-Kang (National United Laboratory of Chemical Engineering,East-China University of Chemical Technology,Shanghai 200237,PRC)

The authors have applied substrate fed-batch feeding to studying the growth kineticsof genetically engineered Saccharomvces cerevisiae strain DBY-745 carrying shuttle *** purpose of that study is to obtain high expression of hepatitis B sur-face antigen(HBsAg).During fermentation the substrate consumes in duplication of themicrobe containing plasmids and that of the cells carrying no plasmids as *** of recombinant plasmids makes a phenotype conversion from Leu~+ to Leu~- as mothercell division *** addition,the substrate also consumes on the formation of someintermediate Ⅰ,which inhibits cell growth to a certain extent.

关键词： S.cerevisiae plasmid fermentation

Melting Evaluation of Phase Change Materials Impregnated into Cascaded Metal Foams with Regionalized Enhancement

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Journal of Thermal Science 2025年第1期34卷 223-241页

作者： wei Xinyi ZHANG Nan ZHANG Zhaoli CAO Xiaoling yuan Yanping School of Mechanical Engineering Southwest Jiaotong University

Metal foam promotes the heat transfer of phase change materials(PCMs) in the penalty of reducing the energy storage density of the composite *** this work,the effects of constant porosity(0.96,0.94,0.92,or 0.90) and pore density(PPI) of metal foam on heat transfer of composite PCMs are *** rate could be enhanced by employing with low porosity copper ***,aiming to the right bottom phase changing "dead region",a regionalized enhancement strategy of cascaded metal foams is *** dynamic melting performances of all the composite PCMs are comprehensively *** results reveal that the cascaded configuration is beneficial for *** show that the horizontal strategy enhances melting performance:a maximum of 17.98% reduction in total melting time could be reached when the rear part porosity is 90%.The energy storage density rate could be raised by 5.48%.Besides,the vertical strategy performs with a better average temperature uniformity of 0.441 and brings a lower temperature in the heated *** sum up,the regionalized enhancement of copper foam provides better performance in the phase change *** shows significant potential for solar heat storage and thermal protection.

关键词： copper metal foam heat transfer enhancement phase change materials regionalized enhancement

Resistance of Cement-based Grouting Materials with Nano- SiO_(2) Emulsion to Chloride Ion Penetration

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 114-119页

作者： LI Shuiping CHENG Jian wei Chao yuan Bin YU Chengxiao College of Architectural Science and Engineering Yangzhou UniversityYangzhou 225127China

The chloride penetration resistance of cement-based grout materials was improved by nano-silica *** of mixtures containing different nano-silica particles or emulsions were exposed in sodium chloride solutions of specific concentrations with different test *** properties of the mixes were assessed in terms of weight loss and compressive strength.X-ray diffraction(XRD)and scanning electron microscopy(SEM)of mixes were performed to analysis the phase evolution and *** results demonstrated that the introduction of nano-SiO_(2) emulsion significantly decreased the compressive strength loss and calcium hydroxide(CH)crystal content of hydration production,and then enhanced the resistance of cement-based grouting materials to chloride ion *** improvement derives from the filling and pozzolanic effects of nano-SiO_(2) particles,which were incorporated via an emulsion and attributed to a well dispersion in grouting matrix.

关键词： grouting materials nano-SiO_(2)emulsion chloride ion penetration,weight loss strength loss

Effects of chest compressions on cardiorespiratory function in a non-arrested porcine model

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Chinese Medical Journal 2013年第12期126卷 2348-2353页

作者： CONG Lu-hong LI Chun-sheng GUO Zhi-jun WANG Shuo WU Jun-yuan yuan wei Department of Emergency Medicine Beijing Chaoyang Hospital Capital Medical University Beijing 100020 China

Background The effects of chest compressions to hemodynamic and respiratory parameters during hands-only cardiopulmonary resuscitation （CPR） in a non-arrested patient who suddenly collapses are *** this research,we investigated the effects of chest compressions in a non-arrested porcine *** Fourteen male domestic pigs were randomized into sham control group （SHAM group,only anesthetized and instrumented without chest compression,n=6） or chest compression group （CC group,2 minutes of chest compressions,n=8）.Continuous hemodynamic parameters,dynamic lung compliance （Cdyn）,and blood gas analysis outcomes were *** levels of catecholamine were measured at baseline and 2 minutes,30 minutes,4 hours,and 24 hours after chest *** computed tomography （CT） was performed at 30 minutes and 24 *** histopathology evaluation was *** After two minutes of chest compressions in the CC group,heart rate and extravascular lung water increased significantly; mean arterial pressure,stroke volume,and global ejection fraction significantly *** significantly decreased to valley levels at 30 minutes and slowly *** with the baseline,serum levels of catecholamine significantly increased at 2 minutes and rapidly decreased 24 hours *** 30 minutes after chest compressions,chest CT showed local exudation,which was absorbed 24 hours *** This research showed that 2 minutes of chest compressions causes various heart and lung tissue damage in the normal a normal porcine *** also impacts the hemodynamic and Cdyn.

关键词： chest compression lung contusion cardiopulmonary function non-arrested

Lablab purpureus(L.) Sweet alleviated rhubarb induced diarrhea in a gut microbiota-dependent manner

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Food Science and Human Wellness 2024年

作者： Yi-meng Fan Qing-yu Zhao yuan-yuan wei Hui-ru Wang Yan-nan Zhang Jian-yu Lü Zhi-hui Hao National Key Laboratory of Veterinary Public Health Security.College of Veterinary Medicine.China Agricultura University Key Biology Laboratory of Chinese Veterinary Medicine， Ministry of Agriculture and Rural Affairs National Center of Technology Innovation for Medicinal function of Food， National Food and Strategic Reserves Administration

Lablab purpureus (L.) Sweet (L. purpureus) has been reported to alleviate diarrhea， although the precise mechanism remains unclear. This study identified the primary active components of L. purpureus utilizing UPLC-MS/MS. A rhubarb-induced diarrhea model in rats was utilized to assess the therapeutic efficacy of L. purpureus. Alterations in gut microbiota and fecal metabolism were analyzed via 16S rDNA analysis and targeted metabolomics. Flora elimination and fecal transplantation techniques were employed to deepen understanding of the role of intestinal flora in L. purpureus treatment. The study findings indicated that the main constituents of L. purpureus included trigonelline， piperidinic acid， and L-(-)-malic acid， among others. L. purpureus treatment significantly alleviated all diarrhea symptoms in rats， encompassing reduced fecal water content， weight loss， shortened colon length， diminished histological damage， and decreased inflammatory factors. Furthermore， L. purpureus significantly enhanced the expression of tight junction markers and restored the dysregulated intestinal flora in diarrheic rats by increasing Prevotella and reducing Lactobacillus. Additionally， the production of propionic acid and other short-chain fatty acids (SCFAs) increased in diarrheic rats treated with L. purpureus， suggesting a substantial alteration in the intestinal environment. Crucially， the protective efficacy of L. purpureus diminishes in the absence of gut flora. Subsequent fecal transplantation tests demonstrated that feces from the L. purpureus-treated group alleviated rhubarb-induced diarrhea， emphasizing the pivotal role of gut microbiota in the antidiarrheal efficacy of L. purpureus. In conclusion， our findings elucidate the underlying mechanisms of L. purpureus' antidiarrheal action and its beneficial impact on intestinal microflora. Moreover， these results provide compelling evidence supporting the therapeutic use of L. purpureus for the treatment of diarrhea and its

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