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Microstructure and stress-rupture property of an experimental single crystal Ni-base superalloy with different heat treatments

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Rare Metals 2014年第2期33卷 144-148页

作者： Jing-Yang Chen La-Mei Cao Ming Xue li-jun liu Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

The influence of heat treatment on the microstructure and stress-rupture property at 1,100 °C/140 MPa was investigated in a 5.0 wt% Re containing experimental single crystal Ni-base superalloy. The results indicate that the γmorphology is nearly cuboidal in the dendrite core after conventional heat treatment. The lattice misfit of alloy becomes more negative after modified heat treatment and results in more cuboidal γ precipitates than that after conventional heat treatment. The increased stress-rupture life after modified heat treatment is attributed to higher γ volume fraction, more negative lattice misfit, well-rafted structure, and narrower c channel width.

关键词： Superalloy Heat treatment γprecipitate Lattice misfit Stress-rupture property

Beyond reproduction:unraveling the impact of sex hormones on cardiometabolic health

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Medical Review

Medical Review 2024年第4期4卷 284-300页

作者： Viktoria Xega jun-li liu MeDiC Program The Research Institute of McGill University Health CentreMontrealCanada Division of Endocrinology and Metabolism Department of MedicineMcGill UniversityMontrealCanada

This review thoroughly explores the multifaceted roles of sexual hormones,emphasizing their impact beyond reproductive functions and underscoring their signiﬁcant inﬂuence on cardiometabolic *** analyzes the broader physiological implications of estrogen,testosterone,and progesterone,highlighting their eﬀects on metabolic syndrome,lipid metabolism,glucose homeostasis,and car-diovascular *** from diverse molecular,clin-ical,and therapeutic studies,the paper delves into the intricate interplay between these hormones and car-diometabolic *** presenting a comprehensive analysis that goes beyond traditional perspectives,and recognizing sexual hormones as more than reproductive agents,the review sheds light on their broader signiﬁcance in health and disease management,advocating for holistic and personalized medical approaches.

关键词： estrogens progesterone androgens metabolic syndrome cardiovascular diseases

Ionized cocatalyst to promote CO_(2) photoreduction activity over core-triple-shell ZnO hollow spheres

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Rare Metals 2022年第4期41卷 1077-1079页

作者： Swelm Wageh Omar A.Al-Hartomy Maged F.Alotaibi li-jun liu Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia College of Chemistry and Chemical Engineering Wuhan Textile UniversityWuhan430200China

Solar-driven CO_(2) conversion into value-added chemicals is a sustainable solution to achieve carbon ***’s group have recently reported Mn,C-codoped ZnO coretriple-shell hollow spheres(CTSHSs)for efficient CO_(2) **... 详细信息

关键词： reduction spheres catalyst

Tongmai Yangxin Pill combined with metoprolol or metoprolol alone for the treatment of symptomatic premature ventricular complex:a multicenter,randomized,parallel-controlled clinical study

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Journal of Geriatric Cardiology 2022年第4期19卷 284-291页

作者： li-jun liu Guo-Hua ZHU Hong-Yu LUO Xi-Peng SUN Jing li Qi HUA Department of Cardiology Xuanwu Hospital Capital Medical UniversityBeijingChina Department of Geriatrics Xuanwu Hospital Capital Medical UniversityBeijingChina

OBJECTIVE To investigate the effects of Tongmai Yangxin Pill(TMYXP)combined with metoprolol tartrate or metoprolol alone for the treatment of premature ventricular complex(PVC)in patients with symptomatic frequent *** A total of 584 patients with symptomatic frequent PVC were randomly assigned(in a 1:1 ratio)into two groups:study group[n=292,TMYXP(40 pills twice/day,orally)combined with metoprolol tartrate(25 mg twice/day,orally)]and control group[n=292,metoprolol tartrate(25 mg twice/day,orally)plus placebo pill(40 pills twice/day,orally)].The total treatment period was eight *** After eight weeks of treatment,the total effective rate of reduction of PVC in the study group and the control group were 76.4%and 51.4%,respectively(P<0.001).TMYXP combined with metoprolol tartrate demonstrated a significantly greater reduction of the frequency of PVCs compared with the metoprolol tartrate alone(−4537 times/24 h vs.−3013 times/24 h,P<0.001).The study group also showed a better result compared with the control group with respect to PVC related *** terms of New York Heart Association classification improvement,the total effective rates were 21.9%in the study group and 12.4%in the control group(P<0.05).Both the study group and the control group exhibited improvements in echocardiographic *** ventricular ejection fraction was significantly improved in the study group compared with the control group(P<0.05).There was no significant difference in the incidence of adverse events between the two *** Compared with metoprolol tartrate alone,TMYXP combined with metoprolol tartrate could more effectively reduce the frequency of PVC and alleviated PVC related symptoms,and improve cardiac function in patients with symptomatic PVC.

关键词： treatment alone complex

Optimal indicator for changing the filter during the continuous renal replacement therapy in intensive care unit patients with acute kidney injury:A crossover randomized trial

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World Journal of Emergency Medicine 2022年第3期13卷 196-201页

作者： Cheng Hang li-jun liu Zhao-yun Huang Jian-liang Zhu Bao-chun Zhou Xiao-zhen li Intensive Care Unit Kunshan Hospital of TCMSuzhou 215300China Intensive Care Unit the Second Affiliated Hospital of Soochow UniversitySuzhou 215004China

BACKGROUND:The study aims to investigate an optimal indicator for changing the filter during the continuous renal replacement therapy(CRRT)in intensive care unit(ICU)patients with acute kidney injury(AKI).METHODS:Patients with AKI requiring CRRT in an ICU were randomly divided into two groups for crossover trial,i.e.,groups A and *** in the group A were firstly treated with continuous veno-venous hemofiltration(CVVH),followed by continuous veno-venous hemodiafiltration(CVVHDF).Patients in the group B were firstly treated with CVVHDF followed by *** doses of solutes with different molecular weights at the indicated time points between groups were compared.A correlation analysis between the delivered dose and pre-filter pressure(P_(PRE))and transmembrane pressure(P_(TM))was *** operating characteristic(ROC)curves were constructed to evaluate the accuracy of P_(TM) as an indicator for filter ***:A total of 50 cases were analyzed,27 in the group A and 23 in the group *** doses of different molecular-weight solutes significantly decreased before changing the filter in both modalities,compared with those at the initiation of treatment(all Plivered dose of medium-molecular-weight solute in both *** threshold for predicting the rebound of serum concentration of medium-molecularweight solute by P_(TM) was 146.5 mm Hg(1 mm Hg=0.133 k Pa).CONCLUSIONS:The filter can be used as long as possible within the manufacturer’s safe use time limits to remove small-molecular-weight solutes.P_(TM) of 146.5 mm Hg may be an optimal indicator for changing the filter in CRRT therapies to remove medium-molecular-weight solutes.

关键词： Acute kidney injury Continuous renal replacement therapy Solute removal efficiency Delivered dose

Comparison of the autofluorescence bronchoscope and the white light bronchoscope in airway examination

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Chinese Journal of Cancer 2010年第12期29卷 1018-1022页

作者： Yun li Xiao li Xi-Zhao Sui liang Bu Zu-li Zhou Fan Yang Yan-Guo liu Hui Zhao Jian-Feng li jun liu Guan-Chao Jiang jun Wang Department of Thoracic Surgery People's Hospital Peking University Beijing 100044 P. R. China

Background and Objective: The sensitivity and accuracy of white light bronchoscopy (WLB) in airway examination are low. Autofluorescence bronchoscope (AFB) can determine early lesions in bronchial mucosa more sensitively, but it has seldom performed in China. To assess the clinical value of the AFB in airway examination, we compared the sensitivity and specificity of the AFB and WLB in detecting cancer of the airway mucosa. Methods: Between September 2009 and May 2010, bronchoscope examinations using both the AFB and WLB were performed on 136 patients, 95 men and 41 women with a median age of 61.5 years (ranged from 25 to 84 years). There were 46 lesions located in the central airway, 84 in the peripheral lung parenchyma, and 6 in the mediastinal region. All patients received local and general anesthesia and were subsequently examined with the WLB and AFB in tandem. All procedures were completed safely. Abnormal visual findings were recorded, and biopsies of the affected regions were collected for pathologic examination. Results: Of 241 regions sampled for biopsy, 76 sites contained malignant lesions, whereas 165 sites contained benign lesions. The AFB detected 72 of the 76 malignant lesions, but the WLB detected only 50. The sensitivities of the AFB and WLB were 94.7% and 65.8%, respectively, and the specificities were 57.0% and 83.6%, respectively. The negative predictive values of the AFB and WLB were 95.9% and 84.1%, respectively. Conclusions: The AFB is more sensitive than the WLB in detecting cancerous lesions in the mucosa, and is an effective airway examination.

关键词：病理检查支气管气道萤光自体检测灵敏度空军基地色光

A New Epidithiodioxopiperazine Metabolite Isolated from Gliocladium roseum YMF1.00133

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Chinese Chemical Letters 2006年第7期17卷 922-924页

作者： Jin Yah DONG Wei ZHOU Lei li Guo Hong li Ya jun liu Ke Qing ZHANG Laboratory for Conservation and Utilization of Bioresources Yunnan University Kunming 650091

Glioclatine, a novel epidithiodioxopiperazine was isolated from wheat solid-substrate fermentation of Gliocladium roseum YMF1.00133. Its structure was elucidated by HRESI-MS and NMR spectra.

关键词： Glioclatine epidithiodioxopiperazine Gliocladium roseum.

Effects of Carrier Gas on Carbon Incorporation in GaN

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Chinese Physics Letters 2014年第3期31卷 122-124页

作者： ZHANG Jian-li liu jun-lin PU Yong FANG Wen-Qing ZHANG Meng JIANG Feng-Yi National Engineering and Technology Research Center for LED on Si Substrate Nanchang University Nanchang 330047

GaN epitaxial layers were grown on Si （111） substrates by metal organic chemical vapor deposition. Carbon concentrations in the films grown in different ambients were measured by secondary ion mass spectrometry. The results show that the carbon incorporation is strongly dependent on the H2 flow rate when the NH3 flow rate is small, but insensitive to the H2 flow rate when the NH3 flow rate is sufficient large. We conclude that H2 can inhibit the dissociation of NH3 and result in a less active N source; an insufficiently active N source causes more N vacancies, which enhances carbon incorporation.

关键词： Gallium nitride

Blood compatibility of zinc-calcium phosphate conversion coating on Mg-1.33li-O.6Ca alloy

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Frontiers of Materials Science 2016年第3期10卷 281-289页

作者： Yu-Hong ZOU Rong-Chang ZENG Qing-Zhao WANG li-jun liu Qian-Qian XU Chuang WANG Zhi-Wei liu College of Chemical and Environmental Engineering Shandong University of Science and Technology Qingdao 266590 China College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China Hospital of Shandong University of Science and Technology Qingdao 266590 China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao 266590 China

Magnesium alloys as a new class of biomaterials possess biodegradability and biocompatibility in comparison with currently used metal implants. However, their rapid corrosion rates are necessary to be manipulated by appropriate coatings. In this paper, a new attempt was used to develop a zinc-calcium phosphate （Zn-Ca-P） conversion coating on Mg-1.33li-0.6Ca alloys to increase the biocompatibility and improve the corrosion resistance. In vitro blood biocompatibility of the alloy with and without the Zn-Ca-P coating was investigated to determine its suitability as a degradable medical biomaterial. Blood biocompatibility was assessed from the hemolysis test, the dynamic cruor time test, blood cell count and SEM observation of the platelet adhesion to membrane surface. The results showed that the Zn-Ca-P coating on Mg-1.33li-0.6Ca alloys had good blood compatibility, which is in accordance with the requirements for medical biomaterials.

关键词： magnesium alloy lithium biomaterial biocompatibility zinc-calciumphosphate coating