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In situ measured growth rates of bainite plates in an Fe-C-Mn-Si superbainitic steel

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International Journal of Minerals,Metallurgy and Materials 2014年第4期21卷 371-378页

作者： zhang-wei hu Guang Xu Hai-jiang hu Li Wang Zheng-liang Xue Key Laboratory for Ferrous Metallurgy and Resources Utilization of the Ministry of Education Wuhan University of Science and Technology State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel Group)

The growth rates of bainite plates in an Fe-C-Mn-Si superbainitie steel were investigated by in situ observation. The lengthening rates of ferrite bainite during both cooling and isothermal holding processes were observed and the growth rates of bainite plates nucleating at grain boundaries, within grains and on preformed bainite were measured. It is indicated that the lengthening rates of bainite plates during the cooling and isothermal processes were different, and that the growth rates of bainite plates nucleating at different types of sites also demon- strated diversity. The bainite plates initiating at [vain boundaries during cooling grew the fastest, while the plates nucleating on preformed bainite did the slowest. However, the growth rate of the bainite plates nucleating at grain boundaries during isothermal transformation de- creased the most, whereas the bainite plates initiating within grains grew the fastest. In addition, the growth rate of ferrite bainite in the study supported the diffusion transformation mechanism of bainite from the viewooint of ~rowth rate.

关键词： bainitic steel bainite growth rate cooling isothermal treatment phase transitions

Enhanced Ferroelectric Properties of Predominantly (100)-oriented Ca_(0.4)Sr_(0.6)Bi_4Ti_4O_(15) Thin Films on Pt/Ti/SiO_2/Si Substrates

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Journal of Materials Science & Technology 2010年第11期26卷 981-985页

作者： Suhue Fan Quande Che Fengqing zhang Ran Yu wei hu College of Material Science and Engineering Shandong Jianzhu University Jinan 250101 China

Predominantly （100）-oriented Ca0.4Sr0.6Bi4Ti4O15 （C0.4S0.6BTi） thin films were prepared on Pt （111）/Ti/SiO2/Si substrates by a sol-gel method at annealing temperatures ranging from 650 to 850 ℃.The growth mode of the predominantly （100）-oriented C0.4S0.6 BTi thin films fabricated by the sequential layer annealing was discussed based on the structure evolution with the annealing *** remnant polarization and coercive field of the C0.4S0.6 BTi film annealed at 800 ℃ are 16.1 μC/cm 2 and 85 kV/cm,*** evident fatigue can be observed after 10 9 switching cycles.

关键词： Ca0.4Sr0.6Bi4Ti4O15 Ferroelectric film Orientation

First-Principles Study of Fe-Doped ZnO Nanowires

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Chinese Physics Letters 2011年第12期28卷 207-210页

作者： zhang Fu-Chun zhang wei-hu DONG Jun-Tang zhang Zhi-Yong College of Physics and Electronic Information Yan'an UniversityYan'an 716000 Information Science and Technology Institution Northwest UniversityXi'an 710127

Using first-principles theory,we predict magnetic,electronic and optical properties in Fe-doped ZnO *** results show that ferromagnetic(FM)coupling of configuration V is the most stable,and the strong hybridization effect between Fe 3d and O 2p states is found near the Fermi level,and it is obvious that the ferromagnetic system is electron−spin polarization of 100%and *** antiferromagnetic(AFM)coupling,the system generates small spin polarization near the Fermi level,indicating *** magnetic moments mainly arise from Fe 3d *** addition,the results of optical properties show that the Fe-doped ZnO nanowires have apparent absorption peaks in the ultraviolet band and that there is a small red shift and a strong blue shift in the near and far ultraviolet band,indicating that Fe-doped ZnO nanowires are a type of magneto-optical materials with great promise.

关键词： nanowires ultraviolet coupling

First-principles calculations and experimental studies of Sn-Zn alloys as negative electrode materials for lithium-ion batteries

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Rare Metals 2011年第2期30卷 160-165页

作者： RU Qiang PENG wei zhang Zhiwen hu Shejun LI Yanling Laboratory of Quantum Information Technology School of Physics and Telecommunication Engineering South China Normal University Guangzhou 510006 China

The physical characters and electrochemical properties of various phases in a Sn-Zn electrode, such as formation energy, plateau potential, specific capacity, as well as volume expansion, were calculated by the first-principles plane-wave pseudo-potential method based on the den- sity functional theory. Sn-Zn films were also deposited on copper foils by an electroless plating technique. The actual composition and chemical characters were explored by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, plasma atomic emission spectrometry （ICP）, and constant current charge/discharge measurements （CC）. The results show that separation phases with tin and zinc including a small quantity of Cu6Sn5 phase were obtained, the initial lithium insertion capacity of the Sn-Zn film was 661 mAh/g, and obvious potential pla- teaus of about 0.4 V and 0.7 V were displayed, which is in accordance with the results of theoretical calculations. The capacity of the Sn-Zn film decreased seriously with the increase of cycle number.

关键词： lithium batteries electrochemical electrodes tin alloys first-principles calculations

The Field Emission Characteristics of Titanium-Doped Nano-Diamonds

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Chinese Physics Letters 2012年第1期29卷 272-275页

作者： YANG Yan-Ning zhang Zhi-Yong zhang Fu-Chun DONG Jun-Tang ZHAO Wu ZHAI Chun-Xue zhang wei-hu College of Physics and Electronic Information Yan’an UniversityYan’an 716000 School of Information Science and Technology Northwest UniversityXi’an 710127

An electrophoresis solution,prepared in a specific ratio of titanium (Ti)-doped nano-diamond,is dispersed by ultrasound and the nano-diamond coating is then deposited on a polished Ti substrate by *** high^-temperature vacuum annealing,the appearance of the surface and the microstructures of the coating are observed by a metallomicroscope,scanning electron microscopy and Raman *** field emission characteristics and luminescence features are also tested,and the mechanism of the field emission characteristics of the Ti-doped nano-diamond is *** experimental results show that under the same conditions,the diamond-coated surface (by deposition) is more uniform after doping with 5 mg of Ti *** with the undoped nano-diamond cathode,the turn-on fields decline from 6.95 to 5.95 V/μ*** the electric field strength is 13.80 V/μm,the field emission current density increases to 130.00 μA/cm^(2).Under the applied fields,the emission current is stable and the luminescence is at its best,while the field emission characteristics of the 10 mg Ti-doped coating become worse,as does the *** reason for this could be that an excessive amount of TiC is generated on the surface of the coating.

关键词： spectroscopy coating Titanium

Effects of tacrolimus and cyclosporine treatment on metabolic syndrome and cardiovascular risk factors after renal transplantation：a meta-analysis

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Chinese Medical Journal 2014年第12期127卷 2376-2381页

作者： Xue Wenrui zhang Qiang Xu Yue Wang wei zhang Xiaodong hu Xiaopeng Department of Urology Beijing Chao-Yang HospitalCapital Medical UniversityBeijing 100020China

Background The therapeutic success of renal transplantation has been largely attributable to the development of effective and balanced immunosuppressive treatment *** study provides a meta-analysis of a series of randomized controlled trials that compared the effects of tacrolimus and cyclosporine on metabolic syndrome （MetS） and cardiovascular risk factors after renal *** We searched various electronic databases and bibliographies,including MEDLINE,the Cochrane Central Register of Controlled Trials,and EMBASE,for relevant studies published prior to October *** Our meta-analysis included five randomized controlled trials that examined a total of 923 *** tacrolimus group and the cyclosporine group exhibited no significant differences in MetS incidence after renal transplantation; risk ratio （RR）：1.06,95％ confidence interval （C/）：0.73-1.55,P=*** treatment was associated with a higher incidence of hyperlipidemia （RR：0.50,95％ CI：0.39-0.64,P ＜0.01）.Although there were no statistically significant differences,cyclosporine treatment was associated with a higher incidence of hypertension （RR：0.91,95％ CI：0.83-1.00,P=0.06） after renal transplantation compared to tacrolimus treatment,and tacrolimus treatment was associated with a higher incidence of diabetes after renal transplantation （RR：1.79,95％ CI：0.98-3.27,P=0.06） compared to cyclosporine *** Compared to tacrolimus treatment,cyclosporine treatment was associated with a higher incidence of *** large-scale studies are expected to be conducted to further confirm our findings.

关键词： post-renal transplantation metabolic syndrome cardiovascular risk factors cyclosporine tacrolimus calcineurin inhibitor meta-analysis

Ultrasound-guided continuous adductor canal block for analgesia after total knee replacement

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Chinese Medical Journal 2014年第23期127卷 4077-4081页

作者： zhang wei hu Yan Tao Yan Liu Xuebing Wang Geng Department of Anesthesiology Beijing Jishuitan Hospital Beijing 100035 China

Background There are several methods for postoperative analgesia for knee *** commonly utilized method is multimodal analgesia based on continuous femoral nerve *** aim of this study was to investigate the application of continuous adductor canal block for analgesia after total knee replacement and compare this method with continuous femoral nerve *** Sixty patients scheduled for total knee replacement from June 2013 to March 2014 were randomly divided into a femoral group and an adductor *** were placed under the guidance of nerve stimulation in the femoral group and under the guidance of ultrasound in the adductor *** were performed under combined spinal and epidural *** the operations,0.2％ ropivacaine was given at a speed of 5 ml/h through catheters in all *** analogue scale （VAS） pain scores at rest and while moving were noted at 4,24,and 48 hours after the operation,and quadriceps strength was also assessed at these *** parameters such as doses of complementary analgesics and side effects were also *** There were no significant differences between the groups in VAS pain scores at rest or while moving,at 4,24,or 48 hours after the operation （P ＞0.05）.At these time-points,mean quadriceps strengths in the adductor group were 3.0 （2.75-3.0）,3.0 （3.0-4.0）,and 4.0 （3.0-4.0）,respectively,all of which were significantly stronger than the corresponding means in the femoral group,which were 2.0 （2.0-3.0）,2.0 （2.0-3.0）,and 3.0 （2.0-4.0）,respectively （P ＜0.05）.There were no significant differences between the groups in doses of complementary analgesics or side effects （P ＞0.05）.X-ray images of some patients showed that local anesthetic administered into the adductor canal could diffuse upward and reach the femoral *** Continuous adductor canal block with 0.2％ ropivacaine could be used effectively for analgesia after total knee *** with

关键词： adductor canal block femoral nerve block ropivacaine total knee replacement multimodal analgesia

Does antecolic reconstruction for duodenojejunostomy improve delayed gastric emptying after pylorus-preserving pancreaticoduodenectomy? A systematic review and meta-analysis

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World Journal of Gastroenterology 2012年第43期18卷 6315-6323页

作者： An-Ping Su Shuang-Shuang Cao Yi zhang Zhao-Da zhang wei-Ming hu Bo-Le Tian Department of Hepatobiliopancreatic Surgery West China Hospital Sichuan University Chengdu 610041 Sichuan Province China

AIM:To evaluate whether antecolic reconstruction for duodenojejunostomy (DJ) can decrease delayed gastric emptying (DGE) rate after pylorus-preserving pancreaticoduodenectomy (PPPD) through literature review and meta-analysis. METHODS:Articles published between January 1991 and April 2012 comparing antecolic and retrocolic reconstruction for DJ after PPPD were retrieved from the databases of MEDLINE (PubMed), EMBASE, OVID and Cochrane Library Central. The primary outcome of interest was DGE. Either fixed effects model or random effects model was used to assess the pooled effect based on the heterogeneity. RESULTS:Five articles were identified for inclusion:two randomized controlled trials and three non-randomized controlled trials. The meta-analysis revealed that antecolic reconstruction for DJ after PPPD was associated with a statistically significant decrease in the incidence of DGE [odds ratio (OR), 0.06; 95% CI, 0.02-0.17; P < 0.00 001] and intra-operative blood loss [mean difference (MD), -317.68; 95% CI, -416.67 to -218.70; P < 0.00 001]. There was no significant difference between the groups of antecolic and retrocolic reconstruction in operative time (MD, 25.23; 95% CI, -14.37 to 64.83; P = 0.21), postoperative mortality, overall morbidity (OR, 0.54; 95% CI, 0.20-1.46; P = 0.22) and length of postoperative hospital stay (MD, -9.08; 95% CI, -21.28 to 3.11; P = 0.14). CONCLUSION:Antecolic reconstruction for DJ can decrease the DGE rate after PPPD.

关键词： Pylorus-preserving pancreaticoduodenectomy Delayed gastric emptying Antecolic reconstruction Retrocolic reconstruction Duodenojejunostomy

Association between SNP and haplotypes in PPARGC1 and adiponectin genes and bone mineral density in Chinese nuclear families

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Acta Pharmacologica Sinica 2007年第2期28卷 287-295页

作者： Zhen-lin zhang~2 Jin-wei HE Yue-juan QIN Yun-qiu hu Miao LI Yu-juan LIU Hao zhang wei-wei hu Department of Osteoporosis,Osteoporosis Research Unit,Affiliated Sixth People’s Hospital,Shanghai Jiaa Tong University,Shangha 200233.China DepartmentofOsteoporosis OsteoporosisResearchUnitAffiliatedSixthPeople'sHospitalShanghaiJiaoTongUniversityShanghai200233China

Aim:To assess the contribution of single nucleotide polymorphisms(SNP)andhaplotypes in the peroxisome proliferator-activated receptor-y co-activator-1(PPARGC1)and adiponectin genes to normal bone mineral density(BMD)varia-tion in healthy Chinese women and ***:We performed population-based(ANOVA)and family-based(quantitative trait locus transmission disequi-librium test)association studies of PPARGC 1 and adiponectin *** in the2 genes were *** was measured using dual-energy X-rayabsorptiometry in the lumbar spine and hip in 401 nuclear families with a total of1260 subjects,including 458 premenopausal women,20-40 years of age;401 post-menopausal women(mothers),43-74 years of age;and 401 men(fathers),49-76years of ***:Significant within-family association was found betweenthe Thr394Thr polymorphism in the PPGAGC 1 gene and peak BMD in the femoralneck(P=0.026).Subsequent permutations were in agreement with this significantwithin-family association result(P=0.016),but Thr394Thr SNP only accounted for0.7% of the variation in femoral neck peak ***,no significant within-family association was detected between each SNP in the adiponectin gene andpeak *** no significant association was found between BMD andSNP in the PPARGCI and adiponectin genes in both men and postmenopausalwomen,haplotype 2(T-T)in the adiponectin gene was associated with lumbarspine BMD in postmenopausal women(P=0.019).Conclusion:Our findings sug-gest that Thr394Thr SNP in the PPARGC1 gene was associated with peak BMD inthe femoral neck in Chinese *** of our results is needed in otherpopulations and with more functional markers within and flanking the PPARGCIor adiponectin genes region.

关键词： bone mineral density peroxisome proliferator activated receptor-y coactivator-1 adiponectin polymorphism haplotypes