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Effect of Grain Size on Mechanical Properties of Nickel-Free High Nitrogen Austenitic Stainless Steel

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Journal of Iron and Steel Research International 2009年第1期16卷 58-61页

作者： LI Hua-bing JIANG Zhou-hua zhang Zu-rui yanG yan School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China

The fine grained structures of nickel-free high nitrogen austenitic stainless steels had been obtained by means of cold rolling and subsequent annealing. The relationship between microstructure and mechanical properties and gain size of nickel-free high nitrogen austenitic stainless steels was examined. High strength and good ductility of the steel were found. In the grain size range, the Hall-Petch dependency for yield stress, tensile strength, and hardness was valid for grain size ranges for the nickel-free high nitrogen austenitic stainless steel. In the present study, the ductility of cold rolled nickel-free high nitrogen austenitic stainless steel decreased with annealing time when the grain size was refined. The fracture surfaces of the tensile specimens in the grain size range were covered with dimples as usually seen in a ductile fracture mode.

关键词： grain refinement strengthening nitrogen nickel-free high nitrogen austenitic stainless steel Hall-Petch equation

Outcomes of primary percutaneous coronary intervention for acute ST-elevation myocardial infarction in patients aged over 75 years

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Chinese Medical Journal 2006年第14期119卷 1151-1156页

作者： zhang Qi zhang rui-yan zhang Jian-sheng HU Jian yanG Zhen-kun ZHENG Ai-fang zhang Xian SHEN Wei-feng Department of Cardiology Shanghai Ruijin Hospital School of Medicine Shanghai Jiao Tong University Shanghai 200025 China

Background The optimal reperfusion strategy in elderly patients with ST-elevation myocardial infarction （STEMI） remains unclear. The purpose of this study was to evaluate the safety, in-hospital and one-year clinical outcomes for patients 〉75 years of age with STEMI receiving primary percutaneous coronary intervention （PCI）, compared with those treated by conservative approach. Methods One hundred and two patients 〉75 years of age with STEMI presented 〈12 hours were randomly allocated to primary PCI （n=50） or conservative therapy only （n=52）. The baseline characteristics, in-hospital outcome and major adverse cardiac events （MACE）, including death, non-fatal myocardial infarction and target vessel revascularization at one-year clinical follow-up were compared between the two groups. Results Age, gender distribution, risk factors for coronary artery disease, infarct site and clinical functional status were similar between the two groups, but the patients in primary PCI group received less low-molecular- weight heparin during hospitalization. Compared with conservative group, the patients in primary PCI group had significantly lower occurrence rate of re-infarction and death and shortened hospital stay. The composite endpoint for in-hospital survivals at 30-day follow-up was similar between the two groups, but one-year MACE rate was significantly lower in the primary PCI group （21.3% and 45.2%, P=0.029）. Left ventricular ejection fraction was not significantly changed in both groups during follow-up. Multivariate analysis revealed that primary PCI （OR=0.34, 95% CI： 0.21-0.69, P =0.03） improved MACE-free survival rate for STEMI patients aged 〉 75 years. Conclusion Our results indicated that primary PCI was safe and effective in reducing in-hospital mortality and one-year MACE rate for elderly patients with STEMI.

关键词： myocardial infarction elderly angioplasty outcome

Long term clinical outcomes in patients with moderate renal insufficiency undergoing stent based percutaneous coronary intervention

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Chinese Medical Journal 2006年第14期119卷 1176-1181页

作者： zhang rui-yan NI Jing-wei zhang Jian-sheng HU Jian yanG Zhen-kun zhang Qi LUE An-kang SHEN Wei-feng Department of Cardiology Shanghai Ruijin Hospital School of Medicine Shanghai Jiao Tong University Shanghai 200025

Background Patients with end-stage renal disease have a high mortality from coronary artery disease, but the impact of moderate renal insufficiency on clinical outcomes after percutaneous coronary intervention （PCI） and the effect of drug-eluting stent implantation in these patients remain unclear. This study determined the long-term effect of moderate renal insufficiency on death and major adverse cardiac events （MACE） after stent based PCI and examined whether drug-eluting stent implantation could favourably influence clinical outcome. Methods Major adverse cardiac events and causes of mortality were determined for 1012 patients undergoing percutaneous intervention from January 1, 2002 to December 31, 2004 at Shanghai ruijin Hospital. Based on estimated creatinine clearance levels, long term outcomes were compared between patients with estimated creatinine clearance 〈60 ml/min （renal insufficiency group; n=410） and those with estimated creatinine clearance ≥60 ml/min （control group; n=602）. Subgroup analysis was also made for patients with renal insufficiency between drug eluting stent （n=264） and bare metal stent implantation （n=146） during PCI. Results During follow-up （average 17 months） after successful PCI, all causes of death （7.1% vs 2.3%, P〈0.01） and cardiac death （3.4% vs 1.0%, all P〈0.01） were significantly higher in renal insufficiency group than in control group. For patients with moderate renal insufficiency, drug-eluting stent implantation reduced significantly all causes of death （5.3% vs 10.9%, P〈0.05） and occurrence of major cardiac adverse events （15.1% vs 24.6%, P〈0.05） compared with bare metal stents. Conclusions Moderate renal insufficiency is an important clinical factor influencing the mortality after PCI in patients with coronary artery disease and the use of drug-eluting stents should be the preferred therapy for the improvement of long-term outcomes in such patients.

关键词： long term outcome percutaneous coronary intervention renal insufficiency drug eluting stent

Clinical Utility of the Ratio Between Circulating Fibrinogen and Fibrin （ogen） Degradation Products for Evaluating Coronary Artery Disease in Type 2 Diabetic Patients

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Chinese Medical Journal 2015年第6期128卷 727-732页

作者： Wei-Xin Xiong Ying Shen Dao-Peng Dai Lin Lu Qi zhang rui-yan zhang Wei-Feng Shen Rong Tao Department of Cardiology Ruijin Hospital Jiao Tong University School of Medicine Shanghai 200025 China Institute of Cardiovascular Disease Jiao Tong University School of Medicine Shanqhai 200025 China

Background:We investigated whether and to what extent the ratio between circulating fibrinogen (Fg) and its degradation products (FDP)reflects the severity of coronary artery disease (CAD) in type 2 diabetic ***:Plasma levels of Fg and FDP were determined,and Fg/FDP ratio was calculated in 344 consecutive patients with type 2 diabetes and chest pain on exertion undergoing coronary *** severity of CAD was evaluated by the number of significant CAD (＞50％ luminal diameter narrowing) and Gensini ***:Plasma Fg was higher,but Fg/FDP ratio was lower in patients with significant CAD (n =255) compared with those without (n =89),due to a disproportionate increase in *** and FDP correlated positively,while Fg/FDP ratio negatively,with the number of diseased coronary arteries and the tertile of Gensini score (all P values for trend ＜ 0.01).After adjusting for age,sex,risk factors for CAD,lipid profiles,glycosylated hemoglobin A1c,creatinine,leukocyte count,and high-sensitivity C-reactive protein,Fg/FDP ratio remained an independent determinant for multivessel coronary disease (MVD) (odds ratio [OR],0.869; 95％ confidence interval [CI],0.788-0.958,P =0.005) and high tertile of Gensini score (OR,0.797,95％ CI,0.682-0.930,P =0.004).The area under the curve of Fg/FDP ratio was larger than that of Fg for predicting the presence of MVD (0.647 vs.0.563,P =0.048) and Gensini score ≥ 30 (0.656 vs.0.53 8,P =0.026).Conclusions:Elevated plasma Fg and FDP level and reduced Fg/FDP ratio are associated with presence of CAD,and Fg/FDP ratio is superior to Fg in reflecting severe coronary atherosclerosis for patients with type 2 diabetes.

关键词： Coronary Artery Disease Diabetes Mellitus Fibrin (ogen) Degradation Products Fibrinogen

Acute coronary syndrome is an independent risk factor for late incomplete stent apposition after sirolimus-eluting stent implantation

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Chinese Medical Journal 2008年第24期121卷 2504-2508页

作者： zhang rui-yan DU Run ZHU Zheng-bin zhang Qi HU Jian LU An-kang zhang Jian-sheng SHEN Wei-feng Department of Cardiology Ruijin Hospital Shanghai Jiao Tong University School of Medicine Shanghai 200025 China Institute of Cardiovascular Disease Shanghai Jiao Tong University School of Medicine Shanghai 200025 China

Background Late incomplete stent apposition （ISA） may occur after drug-eluting stent implantation, affecting long-term clinical outcomes. This study aimed to evaluate the impact of clinical presentations of coronary artery disease on late ISA after percutaneous coronary intervention （PCI） with sirolimus-eluting stents （SES） by means of three-dimensional volumetric intravascular ultrasound （IVUS） analyses. Methods One hundred and thirty-seven patients with coronary artery disease received SES implantation during PCI and had repeat angiography with IVUS examination. All patients were followed up one year after the procedure. Results In overall 219 treated lesions （137 patients）, late ISA was identified in 25 lesions （16 patients）. Clinical diagnosis of acute coronary syndrome （ACS） and use of long stents were more common in patients with than in those without late ISA. Patients with late ISA had greater external elastic membrane （EEM） area in stented segment （（15.34±5.44） vs （13.83±4.51） mm^2, P=0.026）, stented-to-reference segment EEM area ratio （1.13±0.22 vs 1.02±0.18, P 〈0.001）, and plaque and media area （（8.43±3.93） vs （7.01±2.93） mm^2, P =0.002） than in those without late ISA. Multivariate Logistic regression analysis showed that clinical diagnosis of ACS and use of long stents were independent risk factors for late ISA （OR 6.477, 95%CI 2.297-18.263, P 〈0.001; OR 3.680, 95%Cl 1.181-11.469, P =0.025; respectively）. During one-year follow-up after IVUS examination, the rate of very late stent thrombosis tended to be higher in patients with than in those without late ISA （18.7% vs 3.3%, P =0.051）. Conclusions The occurrence of late ISA after SES implantation may be related to clinical status, use of long stents, and marked positive vessel remodeling. Late ISA tended to increase the rate of very late stent thrombosis during follow-up, highlighting the importance of long-term dual antiplatelet therapy for these patients.

关键词： acute coronary syndrome sirolimus-eluting stent intravascular ultrasound late incomplete stent apposition

Modulating redox transition kinetics by anion regulation in Ni-Fe-X(X=O,S,Se,N,and P)electrocatalyst for efficient water oxidation

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Nano Research 2024年第6期17卷 4720-4728页

作者： Liting Wei Kaini zhang rui Zhao Lei zhang yan zhang Suyi yang Jinzhan Su International Research Center for Renewable Energy&State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Applied Chemistry Yuncheng UniversityYuncheng 044000China

NiFe-based electrocatalysts will experience dynamical surface reconstruction during oxygen evolution reaction(OER)process,and the derived metal(oxy)hydroxide hybrids on the surface have been considered as the actual active species for *** efforts have been dedicated to understanding the surface reconstruction,but there is rare research on recognizing the origin of improved performance derived from anion species of ***,the OER electrocatalytic characteristics were tuned with different anions in NiFe-based catalyst,using NiFe-based oxides/nitride/sulfide/selenides/phosphides(NiFeX,X=O,N,S,Se,and P)as the model *** combination of X-ray photoelectronic spectroscopy,electrochemical tests,operando spectroscopic characterizations,and density functional theory(DFT)calculations,reveals that anion with lower electronegativity in NiFe-based catalyst leads to higher conductivity and delayed valence transition of Ni sites,as well as optimized adsorption behavior towards oxygen intermediates,contributing to enhanced OER ***,NiFeP electrocatalyst demonstrates an ultralow overpotential of 265 mV at 20 mA·cm−2 for OER,as well as long-term *** work not only offers further insights into the effect of anionic electronegativity on the intrinsic OER electrocatalytic properties of NiFe-based electrocatalyst but also provides guide to design efficient non-noble metal-based electrocatalysts for water oxidation.

关键词： oxygen evolution reaction(OER) anion species electronegativity valence transition

Drug-eluting stents improve clinical outcomes in Chinese diabetic patients with de novo coronary artery disease

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Chinese Medical Journal 2006年第18期119卷 1576-1579页

作者： zhang Qi FANG Yue-hua zhang rui-yan HU Jian yanG Zhen-kun NI Jun zhang Jian-sheng SHEN Wei-feng Department of Cardiology Shanghai Ruijin Hospital Shanghai Jiaotong University School of Medicine Shanghai 200025 China

Diabetes mellitus （DM） has been regarded as an equivalent risk factor as coronary artery disease and is present in nearly 25% of patients who receive percutaneous coronary intervention （PCI）. DM is shown as an adverse predictor for major adverse cardiac events （MACE） after PCI in bare metal stent （BMS） era. Recently, clinical trials have demonstrated the favorable tendency of using drug-eluting stents （DES） in treating diabetic patients with coronary artery disease. This study compared the clinical outcomes between the diabetic patients receiving DES with those receiving BMS in China.

关键词： coronary disease diabetes mellitus drug-eluting stent outcome assessment

Percutaneous Ventricular Restoration Therapy Using the Parachute Device in Chinese Patients with Ischemic Heart Failure： Three-Month Primary End-point Results of PARACHUTE China Study

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Chinese Medical Journal 2016年第17期129卷 2058-2062页

作者： Yue-Jin yang Yong Huo Ya-Wei Xu Jian-An Wang Ya-Ling Han Jun-Bo Ge rui-yan zhang Xiao-yan yan Run-Lin Gao Department of Cardiology Fu Wai Hospital National Center for Cardiovascular Diseases Chinese Academy of Medical Sciences Belling 100037 China Department of Cardiology Peking University First Hospital Beijing 100034 China Department of Cardiology Shanghai Tenth People's Hospital Tongji University Shanghai 200072 China Department of Cardiology The Second Affiliated Hospital of Zhejiang University Hangzhou Zhejiang 310009 China Department of Cardiology The General Hospital of Shenyang Military Region Shenyang Liaoning 110000 China Department of Cardiology Fudan University Zhongshan Hospital Shanghai 200032 China Department of Cardiology School of Medicine Shanghai Jiaotong University Ruijin Hospital Shanghai 200025 China Department of Biostatistics Peking University Clinical Research Institute Beijing 100191 China

Background： The primary cause of ischemic heart failure （HF） is myocardial infarction （MI） resulting in left ventricle （LV） wall motion abnormality secondary to ventricular remodeling. A prospective, nonrandomized study conducted in China was designed to assess safety and efficacy of the percutaneous ventricular restoration therapy using Parachute device （CardioKinetix, lnc., CA, USA） in ischemic HF patients as a result of LV remodeling after anterior wall M1. Methods： Thirty-one patients with New York Heart Association （NYHA） Class I1, I11 ischemic HF, ejection traction between 15% and 40%, and dilated akinetic or dyskinetic anterior-apical wall without the need to be revascularized were enrolled from seven sites in China from October to December 2014. The Parachute device was implanted through femoral artery. All patients received low-dose aspirin and anticoagulation with warfarin tbr at least 12 months postdevice implantation. The primary end-point was the assessment of efficacy as measured by the reduction in LV end-systolic volume index （LVESVI） against baseline LVESVI at 3 months postdevice implantation, determined by the echocardiography and measured by echocardiography core laboratory. Quality of life was assessed using EQ-SD and visual analog scale （VAS）. For quantitative data comparison, paired t-test （normality data） and signed-rank test （abnormality data） were used： application of signed-rank test was tbr the ranked data comparison. Results： A change in LVESVI as measured by echocardiography from the preimplant baseline to 3-month postdevice implantation revealed a statistically significant reduction from 77.5 ~ 20.0 ml/m-＇ to 53,1 ~ 17.0 ml/m-＂（P 〈 0.0001 ）, The trial met its primary end-point. Of the 31 patients, the procedural success was 96.8%. Overall, NYHA HF class assessment results showed an improvement of more than halfa class at 3 months （P 〈 0.001 ）. Quality of life assessed by the VAS value increased 11.5 points （P 〈 0.01 ）, demonstrating im

关键词： lschemic Heart Failure Left Ventricle Remodeling Percutaneous Ventricular Restoration Structural Heart

Impact of admission creatinine level on clinical outcomes of patients with acute ST-elevation myocardial infarction undergoing primary percutaneous coronary intervention with drug-eluting stent implantation

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Chinese Medical Journal 2008年第23期121卷 2379-2383页

作者： zhang Qi zhang rui-yan SHEN Jie zhang Jian-sheng HU Jian yanG Zheng-kun zhang Xian ZHENG Ai-fang SHEN Wei-feng Department of Cardiology Ruijin Hospital Shanghai Jiao Tong University School of Medicine Shanghai 200025 China

Background Prognosis of patients with acute ST-elevation myocardial infarction （STEMI） and renal dysfunction （RD） who received primary percutaneous coronary intervention （PCI） has not been fully investigated in the drug-eluting stent （DES） era. This study aimed to evaluate the impact of admission serum creatinine level on short-term outcomes in patients with acute STEMI undergoing DES-based primary PCI. Methods Primary PCI with DES implantation was attempted in 619 consecutive STEMI patients within 12 hours of symptom onset. Among them, 86 patients had a serum creatinine level ≥115 μmol/L on admission （RD group）, and the remaining 533 patients had normal renal function （non-RD group）. The primary endpoint was 30-day major adverse cardiac events （MACE, including death, non-fatal reinfarction, and target vessel revascularization）, and the secondary endpoint was subacute stent thrombosis. Results Patients in the RD group were older than those in the non-RD group. There are more female patients in the RD group and they had a history of hypertension, myocardial infarction and revascularization. The occurrence rates of Killip class ≥2 （29.1% vs 18.6%, P=0.02） and multi-vessel （62.8% vs 44.5%, P=0.001） and triple vessel disease （32.6% vs 18.2%, P=0.002）, in-hospital mortality （9.3% vs 3.8%, P=0.03）, and MACE rate during hospitalization （17.4% vs 7.7%, P=-0.006） were higher in the RD group than those in the non-RD group. At a 30-day clinical follow-up, the MACE-free survival rate was significantly reduced in the RD group （76.7% vs 89.9%, P=-0.0003）. Angiographic stent thrombosis occurred in 3 （3.5%） and 7 （1.3%） of patients in the RD group and non-RD group, respectively （P=0.15）. Multivariate analysis revealed that the serum creatinine level 〉115 μmol/L on admission was an independent predictor for MACE rate at a 30-day follow-up （Hazard ratio （HR） 3.31,95% CI 1.19-9.18, P 〈0.001）. Conclusion Despite similar prevalence of stent thrombosis at a 30-day clinical follow-u

关键词： acute myocardial infarction percutaneous coronary intervention drug-eluting stent renal dysfunction prognosis