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Thermo-mechanical properties of mullite–zirconia composites derived from reaction sintering of zircon and sillimanite beach sand: Effect of CaO

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Transactions of Nonferrous Metals Society of China 2016年第9期26卷 2397-2403页

作者： P.KUMAR M.nath A.GHOSH H.S.tripathi Refractories Division CSIR–Central Glass and Ceramic Research Institute Academy of Scientific and Innovative Research (AcS IR) CSIR–Central Glass & Ceramic Research Institute

Mullite–zirconia composites containing 20% zirconia（mass fraction） were prepared by reaction sintering route utilizing Indian coastal zircon flour and sillimanite beach sand. 4%-12% of CaO（mole fraction） with respect to zirconia was used as additive. The effect of additive on densification, microstructure as well as various mechanical and thermo-mechanical properties was studied. Incorporation of CaO reduced the densification temperature of the composites to 1550 ℃ compared to 1600 ℃（for CaO free samples）. CaO formed small amount of liquid phase（calcium aluminosilicate）, which facilitated sintering. Average grain size of the composites decreased up to 4% CaO addition, afterwards grain size increased with further addition of CaO. Samples with 4% CaO exhibited ～225 MPa of flexural strength, ～6 MPa·m^1/2 of fracture toughness and significant improvement in thermal shock resistance. CaO stabilized the tetragonal zirconia phase and thus improved the mechanical properties.

关键词： reaction sintering mullite-zirconia composites flexural strength refractory

Evaluation of antimicrobial activity and bronchodialator effect of a polyherbal drug-Shrishadi

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Asian Pacific Journal of Tropical Biomedicine 2012年第11期2卷 905-909页

作者： Divya Kumari Kajaria Mayank Gangwar Dharmendra Kumar Amit Kumar Sharma Ragini Tilak Gopal nath Yamini Bhusan tripathi JS tripathi SK Tiwari Faculty of Aurveda Department of KayachikitsaInstitute of Medical SciencesBanaras Hindu UniversityVaranasi-221005(Uttar pradesh) Department of Microbiology Institute of Medical SciencesBanaras Hindu UniversityVaranasi- 221005 (Uttar pradesh) Department of Medicinal Chemistry Institute of Medical SciencesBanaras Hindu UniversityVaranasi- 221005 (Uttar pradesh) Faculty of Aurveda Department of KayachikitsaInstitute of Medical SciencesBanaras Hindu University

Objective:To investigate antimicrobial and bronchodialator effect of hydroalcholic extract of polyherbal drug Shirishadi containing Shirisha(Albezzia lebbeck),Nagarmotha(Cyprus ratandus) & Kantakari(Solanum xanthocarpum).Methods:Antimicrobial activity was evaluated by discdiffusion method and MIC,MBC,MFC were calculated by micro dilution *** extract of this preparation was investigated for its phytochemical analysis,phenol and Oavonoid were determined by speclrophotometric method and in vivo bronchodilator effect was analysed by convulsion ***:The phytochemical tests revealed presence of alkaloids, anthraquinones,carbohydrates,flavonoids,saponins and *** antimicrobial result showed the MIC of 6.25 mg/*** Staphylococcus aureus and 12.5 mg/*** Escherichia coli and 12.5 mg/mL against remaining bacteria tested,with strong antifungal *** maximum inhibition zone is found against Pseudomonas aeruginosa with MIC 16 mg/mL Drug showed significant bronchodilator effect with 27.86%& 36.13%increase in preconvulsion time of guinea pigs prebeated with 100 & 200 mg/kg body weight of ***:The study reveals that the extracts possess antibacterial activity and antifungal activity in a dose dependent manner. This antimicrobial property may be due to presence of several saponins,further studies are highly needed for the drug development.

关键词： Shrishadi-polyherbal drug Phytochemical Phenolic & flavonoid content Candida species Bronchodilator

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尼泊尔基本石油地质条件及对油气勘探的启示

地质通报 2023年第2期42卷 411-419页

作者：王正和谭富文 Rajaure Sudhir tripathi Ganesh nath 杜佰伟杨平中国地质调查局成都地质调查中心四川成都610081 自然资源部沉积盆地与油气资源重点实验室四川成都610081 Department of Mines and Geology KathmanduNepal

尼泊尔境内地质条件复杂,油气勘探程度和投入及油气地质认识程度很低,但其低喜马拉雅带及以南地区具丰富的油气显示。为了进一步探讨尼泊尔山前带的油气勘探潜力,结合前人研究成果及新认识,对尼泊尔低喜马拉雅带及以南的区域油气地质特... 详细信息

尼泊尔境内地质条件复杂,油气勘探程度和投入及油气地质认识程度很低,但其低喜马拉雅带及以南地区具丰富的油气显示。为了进一步探讨尼泊尔山前带的油气勘探潜力,结合前人研究成果及新认识,对尼泊尔低喜马拉雅带及以南的区域油气地质特征进行了梳理、总结与分析。结果表明,尼泊尔低喜马拉雅带及以南发育多套潜在的规模性烃源岩,具有潜在的生、储、盖组合;新构造运动是控制区域性油气运移与调整成藏的关键;丰富的地表油气显示及静态石油地质条件预示着尼泊尔低喜马拉雅带及以南,尤其是MBT以南具有良好的油气远景与勘探潜力。

关键词：尼泊尔石油地质烃源岩油气潜力喜马拉雅新构造运动

CSF tau and amyloid β<sub>42</sub>levels in Alzheimer’s disease—A meta-analysis

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Advances in Alzheimer's Disease 2012年第3期1卷 30-44页

作者： Rachna Agarwal Neelam Chhillar Vijay nath Mishra Chandra Bhushan tripathi Department of Biostatistics Institute of Human Behaviour & Allied Sciences Delhi India Department of Neurochemistry Institute of Human Behaviour & Allied Sciences Delhi India Department of Neurology Institute of Medical Sciences Banaras Hindu University Varanasi India

Alzheimer’s disease International (ADI) estimates that there are currently 30 million people with dementia in the world. The main objective was to perform meta-analysis of studies of CSF tau and Amyloid β42 (Aβ42) levels in Alzheimer’s disease (AD) patients and controls. In the present study MEDLINE was reviewed from 1995 to 2009, supplemented by citation analysis from retrieved articles to select case control studies. Descriptive statistics showed that median effect size (raw mean difference) of CSF tau and Aβ42 levels were 301 pg/ml (Range: 22 to 614 pg/ml) and –352 pg/ml (Range: –969 to 203 pg/ml) respectively. The pooled effect size CSF tau and Aβ42 was 289.14 pg/ml (95% CI 253.278 to 325.013 pg/ml) and –329.02 pg/ml (95% CI –387.740 to –270.445 pg/ml) respectively. Heterogeneity in effect size of selected studies was present for both parameters (CSF tau: Q statistics = 1816.596, DF = 40, P = 0.000 and CSF Aβ42: Q-statistics = 1259.358, DF = 24, p 42 levels in AD and controls may be considered as potential biomarker along with the clinical phenotype to perform them during high quality diagnostic testing in dementia.

关键词： Alzheimer’s Disease Dementia CSF Amyloid β42 CSF Tau Meta-Analysis

尼泊尔及南侧邻区元古宙以来的构造-沉积演化

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地球科学 2022年第2期47卷 405-417页

作者：王正和谭富文 Sudhir R. Ganesh N.T. 杜佰伟杨平中国地质调查局成都地质调查中心四川成都610081 自然资源部沉积盆地与油气资源重点实验室四川成都610081 Department of Mines and Geology KathmanduNepal

迄今,尼泊尔及其南侧邻区元古宙以来的构造-沉积演化尚缺乏系统性研究.为了促进区域地质认识,结合前人研究成果及新的研究发现,对尼泊尔低喜马拉雅带及以南的构造-沉积演化首次进行系统性总结与讨论.结果表明:尼泊尔低喜马拉雅带及以南... 详细信息

迄今,尼泊尔及其南侧邻区元古宙以来的构造-沉积演化尚缺乏系统性研究.为了促进区域地质认识,结合前人研究成果及新的研究发现,对尼泊尔低喜马拉雅带及以南的构造-沉积演化首次进行系统性总结与讨论.结果表明:尼泊尔低喜马拉雅带及以南与印度地盾北缘在地质历史中的构造-沉积演化息息相关,且自元古宙以来,发育了被动大陆边缘→陆内裂谷→被动大陆边缘→前陆盆地等不同构造演化阶段的沉积响应;尼泊尔西部的Dailekh群属于~1.8 Ga以前或前哥伦比亚超大陆之前的被动大陆边缘沉积;Vindhyan超群为下断上坳的陆内裂谷沉积,尼泊尔境内的Lakharpata群相当于下Vindhyan群;Gondwana超大陆裂解导致由北往南形成一系列初始发育时间越来越晚的裂谷盆地;Surkhet群至Siwalik群为被动大陆边缘至前陆盆地沉积,其中,Surkhet群Swat/Subathu组是喜马拉雅南侧地质历史上最后一套海相沉积地层,也是被动大陆边缘向前陆盆地转换期的沉积响应;Siwalik群大规模的磨拉石建造标志着喜马拉雅快速和大幅度隆升,该群沉积成岩后,印度-欧亚板块进一步的挤压作用导致了地质历史上迄今为止最后一次强烈的构造运动,形成MFT与Siwalik褶皱带,并奠定了喜马拉雅带现今构造格局.

关键词：喜马拉雅印度地盾尼泊尔构造-沉积演化大陆裂解构造地质

Family history and disease outcomes in patients with Crohn's disease:A comparison between China and the United States

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World Journal of Gastrointestinal Pharmacology and Therapeutics 2016年第4期7卷 556-563页

作者： Pei-Qi Wang Jun Hu Elie S Al Kazzi Eboselume Akhuemonkhan Min Zhi Xiang Gao Raquel Holand de Paula Pessoa Sami Ghazaleh Tuhina Cornelius Suhel Abbas Sabunwala Shadi Ghadermarzi Kartikeya tripathi Mark Lazarev Pin-Jin Hu Susan Hutfless Department of Medicine Division of Gastroenterology and HepatologyJohns Hopkins University Guangdong provincial Key Laboratory of Colorectal and Pelvic Floor Diseases the Sixth Affiliated Hospital of Sun Yat-sen University Department of Gastroenterology the Sixth Affiliated Hospital of Sun Yat-sen University Department of Medicine Med Star Health Internal Medicine Department of Health and Sport Sciences Federal University of Acre Department of Medicine Faculty of Medicine and Health SciencesAn-Najah National University Ravindra nath Tagore Medical College St Vincent Hospital Department of Epidemiology Johns Hopkins University Bloomberg School of Public Health

AIM To investigate the differences in family history of inflammatory bowel disease(IBD) and clinical outcomes among individuals with Crohn's disease(CD) residing in China and the United *** We performed a survey-based cross-sectional study of participants with CD recruited from China and the United *** compared the prevalence of IBD family history and history of ileal involvement,CD-related surgeries and IBD medications in China and the United States,adjusting for potential *** We recruited 49 participants from China and 145 from the United *** prevalence of family history of IBD was significantly lower in China compared with the United States(China:4.1%,United States:39.3%).The three most commonly affected types of relatives were cousin,sibling,and parent in the United States compared with child and sibling in *** involvement(China:63.3%,United States:63.5%) and surgery for CD(China:51.0%,United States:49.7%) were nearly equivalent in the two *** The lower prevalence of familial clustering of IBD in China may suggest that the etiology of CD is less attributed to genetic background or a family-shared environment compared with the United *** the potential difference in etiology,surgery and ileal involvement were similar in the two *** the changes in family history during the continuing rise in IBD may provide further insight into the etiology of CD.

关键词： Crohn’s disease Family history Disease outcome Inflammatory bowel disease Epidemiology genetics Environment Medication Surgery