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Correlating mode-I fracture toughness and mechanical properties of heat-treated crystalline rocks

Journal of Rock Mechanics and Geotechnical Engineering 2018年第1期10卷 91-101页

作者： Mayukh Talukdar debanjan guha roy T.N.Singh Indian Institute of Technology Bombay PowaiMumbai400076India IITB-Monash Research Academy Indian Institute of Technology BombayPowaiMumbai400076India

For the effect of thermal treatment on the mode-I fracture toughness(FT), three crystalline rocks(two basalts and one tonalite) were experimentally investigated. Semi-circular bend specimens of the rocks were prepared following the method suggested by the International Society for Rock Mechanics(ISRM)and were treated at various temperatures ranging from room temperature(25 ℃) to 600 ℃. Mode-I FT was correlated with tensile strength(TS), ultrasonic velocities, and Young’s modulus(YM). Additionally,petrographic and X-ray diffraction analyses were carried out to find the chemical changes resulting from the heat treatment. Further, scanning electron microscopy(SEM) was conducted to observe the micro structural changes when subjected to high temperatures. These experiments demonstrate that heat treatment has a strong negative impact on the FT and mechanical properties of the rocks. From room temperature to 600 ℃, mode-I FT values of massive basalt, giant plagioclase basalt, and tonalite were reduced by nearly 52%, 68%, and 64%, respectively. Also, at all temperature levels, FT and mechanical properties are found to be exponentially correlated. However, the exact nature of the relationship mainly depends on rock type. Besides, TS was found to be a better indicator of degradation degree than the mode-I FT. SEM images show that micro crack density and structural disintegration of the mineral grains increase with temperature. These physical changes confirm the observed reduction in the stiffness of heat-treated crystalline rocks.

关键词： Fracture toughness(FT) Tensile strength(TS) Ultrasonic velocity Young's modulus(YM) Crystalline rocks

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Role of self-help groups on socioeconomic development and the achievement of Sustainable Development Goals(SDGs)among rural women in Cooch Behar District,India

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Regional Sustainability 2024年第2期5卷 63-74页

作者： debanjan BASAK Indrajit roy CHOWDHURY Department of Geography and Applied Geography University of North BengalSiliguri734013India

This study examines the transformative role of self-help groups(SHGs)in the socioeconomic development of rural women in Cooch Behar District,India,and their contribution toward achieving Sustainable Development Goals(SDGs)of the United *** this study,we explored the effect of SHGs on rural women by specifically addressing SDGs,such as no poverty(SDG 1),zero hunger(SDG 2),good health and well-being(SDG 3),quality education(SDG 4),and gender equality(SDG 5).Given this issue,a cross-sectional survey and comparison analyses are needed to assess the socioeconomic development of rural women and their awareness level before and after the participation of rural women in *** survey conducted as part of this study was divided into three sections,namely,demographic characteristics,socioeconomic development,and awareness level,with each focusing on different aspects.A group of 400 individuals who were part of SHGs completed the questionnaire survey *** results showed that the participation of rural women in SHGs significantly improved their socioeconomic development and awareness level,as supported by both mean values and t test *** in SHGs and microcredit programs were the major elements that boosted the socioeconomic development of rural women,which also achieves SDGs 1,2,3,4,and *** study revealed that participation in SHGs and related financial services significantly aided rural women in economically disadvantaged communities in accumulating savings and initiating entrepreneurial ***,participation in SHGs was instrumental in enhancing the self-confidence,self-efficacy,and overall self-esteem of rural ***,doing so enabled them to move more freely for work and other activities and to make family and common decisions.

关键词： Self-help groups Rural women Socioeconomic development Sustainable Development Goals(SDGs) Microcredit India

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Observation of Resistive Switching Memory by Reducing Device Size in a New Cr/CrO_x/TiO_x/TiN Structure

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Nano-Micro Letters 2015年第4期7卷 392-399页

作者： debanjan Jana Subhranu Samanta Sourav roy Yu Feng Lin Siddheswar Maikap Thin Film Nano Tech. Lab. Department of Electronic Engineering Chang Gung University

The resistive switching memory characteristics of 100 randomly measured devices were observed by reducing device size in a Cr/Cr Ox/Ti Ox/Ti N structure for the first *** electron microscope image confirmed a viahole size of 0.4 lm.A 3-nm-thick amorphous Ti Oxwith 4-nm-thick polycrystalline Cr Oxlayer was observed.A small 0.4-lm device shows reversible resistive switching at a current compliance of 300 l A as compared to other larger size devices(1–8 lm)owing to reduction of leakage current through the Ti *** device-to-device uniformity with a yield of[85%has been clarified by weibull distribution owing to higher slope/shape *** switching mechanism is based on oxygen vacancy migration from the Cr Oxlayer and filament formation/rupture in the Ti *** read pulse endurance of[105cycles,good data retention of 6 h,and a program/erase speed of 1 ls pulse width have been obtained.

关键词： CrOx TiOx Resistive switching memory Slope/shape factor Device size

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An Elegant Coupled Model

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Advances in Atmospheric Sciences 1993年第2期10卷 257-260页

作者： Chanchal guha-roy Dilip Kumar Sinha Center for Atmospheric Sciences University of Calcutta 92 Acharya Prafulla Chandra RoadCalcutta-700009 IndiaCenter for Atmospheric Sciences University of Calcutta 92 Acharya Prafulla Chandra RoadCalcutta-700009 India

This paper deals with a new family of coupled wave equations which are basically nonlinear in nature. An analytical study enables us to show that these equations exhibit solitary wave profiles. Finally some remarks ar... 详细信息

关键词： An Elegant Coupled Model

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On a Class of Solitary Wave Solutions of Atmospheric Nonlinear Equations

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Advances in Atmospheric Sciences 1991年第3期8卷 357-362页

作者： R. Dhar C. guha-roy D. K. Sinha Permanent address: S. A. Jaipuria College 10 Raja Nabakrishna Street Calcutta-700005 INDIADepartment of Mathematics Jadavpur University Calcutta-700032 IndiaCentre for atmospheric Sciences University of Calcutta 92 A. P. C. Road Calcutta-700009 INDIA

In this paper, an attempt is made to study some interesting results of the coupled nonlinear equations in the atmosphere. By introducing a phase angle function ζ, it is shown that the atmospheric equations in the pre... 详细信息

关键词： On a Class of Solitary Wave Solutions of Atmospheric Nonlinear Equations

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Pediatric thermal burn injury:A retrospective analysis from pediatric care institutes,Eastern India

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Journal of Integrative Nursing 2023年第2期5卷 108-114页

作者： Kartik Chandra MANDAL Sourav roy Pankaj Kumar HALDER Partha CHAKRABORTY L.NEILASANO Debasree guha Department of Pediatric Surgery Dr.B.C.Roy Post Graduate Institute of Pediatric SciencesKolkataWest BengalIndia Department of Pediatric Surgery R.G.Kar Medical CollegeKolkataWest BengalIndia Department of General Surgery R.G.Kar Medical CollegeKolkataWest BengalIndia Department of Pediatric Medicine R.G.Kar Medical CollegeKolkataWest BengalIndia

Objective:Pediatric burns pose difficult healthcare issues in underdeveloped *** to the scarcity of pediatric burn care facilities and qualified burn‑care staff,patients are frequently referred from a rural *** study explores the burn‑treatment approach that could be used in rural hospitals in the absence of a dedicated pediatric burn care *** and Methods:A retrospective analysis of clinical data of 199 children who received treatment for burn‑injury in an isolated general surgical *** debridement under anesthesia at the earliest was the cornerstone of the treatment plan for this *** the wounds healed,the treatment was repeated every alternate *** patient’s demographic data,number of surgical dressings,length of hospital stay,and outcome were ***:The mean age of the patients was 51.68±23.79 *** male‑female ratio was 1.45:*** survival rate was 99.00%.The disability rate was 4.52%.Univariate logistic regression identified the age group,total body surface area affected,depth of the wound,and time of intervention as statistically significant variables(P<0.05)predicting the *** logistic regression identified the time intervals between surgical intervention and injury as an important predictor of *** addition,delayed presentation and delayed intervention led to a longer hospital stay,and more interventions than the early intervention ***:Early debridement accelerates recovery and lessens the need for future skin grafts or contracture *** approach can be used in rural hospitals as well because pediatric burns can be manageable in an isolated general ward.

关键词： Anesthesia burn cleaning closed debridement dehydration hypothermia paraffin oil pediatric

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千分之一效能白砷剂改善慢性砷中毒症状的初步临床观察(英文)

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中西医结合学报 2011年第6期9卷 596-604页

作者： Anisur Rahman Khuda-Bukhsh Antara Banerjee Surjyo Jyoti Biswas Susanta roy Karmakar Pathikrit Banerjee Surajit Pathak Bibhas guha Saiful Haque Debarsi Das Arnab De Durba Das Naoual Boujedaini Department of Zoology Laboratory of Cytogenetics and Molecular BiologyUniversity of KalyaniKalyani 741235India Department of Surgical and Gastroenterological Science University of PadovaPadovaItaly Department of Zoology Netaji Subhas Open UniversityKolkata 700020India Boiron Laboratory 20 rue de la LiberationSainte-Les-Foy-LyonLyonFrance

背景:全世界有数以百万计的人饮用砷污染的地下水,而目前尚未有缓解慢性砷中毒症状的有效制剂。文献报道白砷剂LM0/3作为一种顺势疗法强化制剂,对于砷中毒症状有一定的治疗作用。目的:本研究旨在验证白砷剂LM0/3对由于生活环境所致而长... 详细信息

背景:全世界有数以百万计的人饮用砷污染的地下水,而目前尚未有缓解慢性砷中毒症状的有效制剂。文献报道白砷剂LM0/3作为一种顺势疗法强化制剂,对于砷中毒症状有一定的治疗作用。目的:本研究旨在验证白砷剂LM0/3对由于生活环境所致而长期饮用砷污染水的人群的慢性砷中毒症状的缓解作用。设计、场所、对象和干预措施:本研究为双盲安慰剂对照研究,参加本研究的28名志愿者来自印度西孟加拉邦纳迪亚区一村落,该村无不含砷的饮用水可用,水井中的含砷量为55～95μg/mL。受试者分别服用药物或安慰剂,在参加试验前及2个月后试验结束时提供血、尿样本。另有18名来自无砷污染饮用水村的志愿者提供血、尿样本作为阴性对照。主要结局指标:测量受试者血、尿样本中的砷含量,各类中毒生物标记物及病理生理指标。结果:28名受试者中,14名愿意提供血、尿样本,其余14名退出试验。受试者的血、尿样本检测出砷的浓度升高,碱性磷酸酶及酸性磷酸酶水平升高,脂质过氧化反应及谷胱甘肽活性升高,血糖、三酰甘油、总胆固醇及低密度脂蛋白胆固醇水平升高,天门冬氨酸氨基转移酶及丙氨酸氨基转移酶水平、γ谷氨酰转移酶及葡萄糖6磷酸脱氢酶含量降低,高密度脂蛋白胆固醇水平及红细胞压积降低。2个月后,用药组的上述指标均有所改善,基质金属蛋白酶活性较安慰剂组有所降低。结论:在尚未有更好的医疗条件和治疗手段的情况下,使用白砷剂LM0/3在饮用水受砷污染地区作为暂时的治疗手段以缓解生活在这些地区的人们的慢性砷中毒症状有一定的可行性。

关键词：砷剂顺势疗法砷中毒生物学标记基质金属蛋白酶类临床试验

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