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Macro and meso analysis of jointed rock mass triaxial compression test by using equivalent rock mass(ERM) technique

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Journal of Central South University 2014年第3期21卷 1125-1135页

作者：周喻吴顺川高永涛 A.misra Key Laboratory for Efficient Mining and Safety of Metal Mine of Ministry of Education of China(University of Science and Technology Beijing) School of Engineering University of Kansas

Methods that can efficiently model the effects of rock joints on rock mass behavior can be beneficial in rock engineering. The suitability of equivalent rock mass(ERM) technique based upon particle methods is investigated. The ERM methodology is first validated by comparing calculated and experimental data of lab triaxial compression test on a set of cylindrical rock mass samples, each containing a single joint oriented in various dip angles. The simulated results are then used to study the stress-strain nonlinearity and failure mechanism as a function of the joint dip angle and confining stress. The anisotropy and size effects are also investigated by using multi-scale cubic ERM models subjected to triaxial compression test. The deformation and failure behavior are found to be influenced by joint degradation, the micro-crack formation in the intact rock, the interaction between two joints, and the interactions of micro-cracks and joints.

关键词：三轴压缩试验节理岩体 ERM 技术等效宏观岩石工程风险管理方法

Microstructure and Mechanical Properties of Nb-B bearing Low Carbon Steel Plate: Ultrafast Cooling versus Accelerated Cooling

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Journal of Wuhan University of Technology(Materials Science) 2017年第3期32卷 619-624页

作者：王丙兴 DONG Fuzhi WANG Zhaodong RDK misra WANG Guodong State Key Laboratory of Rolling and Automation Northeastern University Laboratory for Excellence in Advanced Steel Research Center for Structural and Functional Materials Research and Innovation and Department of Metallurgical and Materials Engineering University of Texas at El Paso

The microstructure and mechanical properties of low carbon bainite high strength steel plate were studied via different cooling paths at the pilot scale. There was a significant increase in mechanical properties, and notably, the yield strength, tensile strength, and toughness at-40 ℃ for the tested steel processed by ultra-fast cooling were 126 MPa, 98 MPa and 69 J, respectively, in relation to steel processed by accelerated cooling. The ultra-fast cooling rate not only refined the microstructure, precipitates, and martensiteaustenite（M/A） islands, but also contributed to the refinement of microstructure in thick plates. The large size M/A constituents formed at lower cooling rate experienced stress concentration and were potential sites for crack initiation, which led to deterioration of low-temperature impact toughness. In contrast, the acicular ferrite and lath bainite with high fraction of high-angle grain boundaries were formed in steel processed by ultra-fast cooling, which retarded cleavage crack propagation.

关键词： TMCP ultra-fast cooling M/A constituent low-temperature toughness

INFLUENCE OF SLIP VELOCITY ON BLOOD FLOW THROUGH AN ARTERY WITH PERMEABLE WALL： A THEORETICAL STUDY

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International Journal of Biomathematics 2012年第5期5卷 147-166页

作者： A. SINHA J. C. misra School of Medical Science and Technologyindian Institute of Technology Kharagpur-721302 India Department of 1Vlathematics Institute of Technical Education and ResearchSiksha 0 Anusandhan University Bhubaneswar India

A theoretical investigation concerning the influence of slip velocity on the flow of blood through an artery having its wall permeable has been carried out. Here blood is treated as a homogeneous Newtonian fluid. The flow is characterized by three parameters: β the ratio of radius to length of the arterial segment, Re the characteristic Reynolds number associated with the pressure outside the arterial segment and ϵ the filtration coefficient. The problem has been solved by the use of a perturbation technique. ϵ is considered to be very small, ensuring the validity of the perturbation method. The computed numerical results are presented graphically to depict the variations in velocity, volumetric flow rate, wall shear stress and flow resistance.

关键词：滑移速度动脉渗透液流牛顿流体外部压力扰动技术扰动方法

Treatment of wheat straw using tannase and white-rot fungus to improve feed utilization by ruminants

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Journal of Animal Science and Biotechnology 2014年第2期5卷 222-229页

作者： Shailendra Raghuwanshi Swati misra Rajendra Kumar Saxena Department of Microbiology University of Delhi South CampusBenito Juarez Road New Delhi 110 021India

Background： Current research to enrich cattle feed has primarily focused on treatment using white rot fungi, while there are scarce reports using the enzyme tannase, which is discussed only in reviews or in the form of a hypothesis. In this context, the aim of the present study was to evaluate the effect of tannase on wheat straw （WS） and also the effect of lyophilized tannase at concentrations of 0.1%, 0.2%, and 0.3% （w/w） on WS followed by fermentation with Ganodermo sp. for 10 d and compared in relation to biochemical parameters, crude protein （CP） content, and nutritional value by calculating the C/N ratio in order to improve the nutritional value of cattle feed. Results： Penicillium charlesii, a tannase-producing microorganism, produced 61.4 IU/mL of tannase in 54 h when 2% （w/v） tannic acid （TA） was initially used as a substrate in medium containing （% w/v） sucrose （1.0）, NaNO3 （1.0）, and MgSO4 （0.08 pH, 5.0） in a 300-L fermentor （working volume 220 L）, and concomitantly fed with 1.0% （w/v） TA after 24 h. The yield of partially purified and lyophilized tannase was 5.8 IU/mg. The tannin-free myco-straw at 0.1% （w/w） tannase showed 37.8% （w/w） lignin degradation with only a 20.4% （w/w） decrease in cellulose content and the in vitro feed digestibility was 32.2%. An increase in CP content （up to 1.28-fold） along with a lower C/N ratio of 25.0%, as compared to myco-straw, was obtained. Conclusions： The use of tannin-free myco-straw has potential to improve the nutritional content of cattle feed. This biological treatment process was safe, eco-friendly, easy to perform, and was less expensive as compared to other treatment methods.

关键词： Ganoderma sp High energy cattle feed Tannase Tannin free myco-straw

Pitting corrosion behavior and corrosion protection performance of cold sprayed double layered noble barrier coating on magnesium-based alloy in chloride containing solutions

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Journal of Magnesium and Alloys 2023年第9期11卷 3099-3119页

作者： M.Daroonparvar A.Helmer A.M.Ralls M.U.Farooq Khan A.K.Kasar R.K.Gupta M.misra S.Shao P.L.Menezes N.Shamsaei National Center for Additive Manufacturing Excellence Auburn UniversityAuburnAL 36849USA Department of Mechanical Engineering Auburn UniversityAuburnAL 36849USA Department of Materials Science and Engineering College of EngineeringNorth Carolina State University911 Partners WayRaleighNC 27695USA Department of Mechanical Engineering University of Nevada RenoRenoNV 89501USA Department of Nuclear Engineering and Radiological Sciences University of MichiganAnn ArborMI 48105 USA Department of Chemical and Materials Engineering University of Nevada RenoNV 89501USA

Nitrogen processed, cold sprayed commercially pure(CP)-Al coatings on Mg-based alloys mostly lack acceptable hardness, wear resistance and most importantly are highly susceptible to localized corrosion in chloride containing solutions. In this research, commercially pure α-Ti top coating having good pitting potential(~1293 mV_(SCE)), high microhardness(HV_(0.025): 263.03) and low wear rate was applied on a CP-Al coated Mg-based alloy using high pressure cold spray technology. Potentiodynamic polarization(PDP) curves indicated that the probability of transition from metastable pits to the stable pits for cold spayed(CS) Al coating is considerably higher compared to that with the CS Ti top coating(for Ti/Al/Mg system). In addition, CS Ti top coating was in the passivation region in most pH ranges even after 48 h immersion in 3.5 wt% NaCl solution. The stored energy in the CS Ti top coating(as a passive metal) was presumed to be responsible for the easy passivation. Immersion tests indicated no obvious pits formation on the intact CS Ti top coating surface and revealed effective corrosion protection performance of the CS double layered noble barrier coatings on Mg alloys in 3.5 wt% NaCl solution even after 264 h.

关键词： Ti coating Mg alloys Localized corrosion Passivity Dislocation density Crystallite size

Perspectives and challenges of tropical medicinal herbs and modern drug discovery in the current scenario

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Asian Pacific Journal of Tropical Medicine 2019年第1期12卷 1-7页

作者： Rajesh Kumar Kesharwani Krishna misra Dev Bukhsh Singh Department of Advanced Science & Technology NIET Nims University Rajasthan Department of Applied Science Indian Institute of Information Technology Allahabad Department of Biotechnology Institute of Biosciences and Biotechnology Chhatrapati Shahu Ji Maharaj University

Tropical diseases such as malaria, tuberculosis, trypanosomiasis, and leishmaniasis, account for a large number of deaths annually. Herbs are an excellent source of tropical medicines. Many advancements and discoveries have taken place in the field of drug discovery but still, a major population of tropical diseases relies on herbal traditional medicine. There are some challenges related to policy implementation, efficacy, resistance and toxicity of tropical medicines. There are many tropical diseases such as such as schistosomiasis, leishmaniasis, African sleeping sickness, filariasis and chagas disease which are neglected because very few pharmaceutical companies have shown their interest in developing therapeutics against these diseases of poor people. There are many benefits associated with herbal medicine such as the cost of production, patient tolerance, large scale availability, efficacy, safety, potency, recyclability, and environment friendly. A large number of natural extracts such as curcumin, artemisinin, morphine, reserpine, and hypericin, are in use for treatment of different tropical diseases for a long time. The current review is to discuss the overview of tropical medicinal herbs, its scope and limitations in the modern drug discovery process.

关键词： Herbs Natural sources Lead compounds Drug discovery Computational approaches

Emplacement of Dyke Swarms, Cretaceous Volcanism and Development of Petroliferous Basins in and around Peninsular India

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 59-60页

作者： Kiran.S.misra Anshuman misra University of Petroleum and Energy Studies Kumaun University

We illustrate intricate genetic relationship between prolonged extensional tectonics,formation of several sedimentary basins,enormous Cretaceous volcanism and emplacement of great dyke swarms as well assequential

关键词： Cretaceous Volcanism and Development of Petroliferous Basins in and around Peninsular India Emplacement of Dyke Swarms

Comparative study of green peas using with blanching & without blanching techniques

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Information Processing in Agriculture 2019年第2期6卷 285-296页

作者： Om Prakash Pandey Bimal Kumar Mishra Ashok misra Department of Mechanical Engineering Birla Institute of TechnologyMesraRanchiIndia Department of Mathematics Birla Institute of TechnologyMesraRanchiIndia

This paper attempts to analyze the kinetics involved in the drying of green peas in‘with blanching’and‘without blanching’*** by hot water mixed with a solution of citric acid(0.1–0.2 mg/ml)at 70C–100C is the treatment provided to the samples of green *** analysis shows that the moisture content in green peas of three different sizes is reduced at different temperatures and demonstrates the effect of the rate of drying of the moisture *** different diameters and temperatures,the parameters are analyzed using‘with blanching’and‘without blanching’*** is observed that‘with blanching’process plays a significant role in the reduction of moisture content under different temperatures and diameters in a lesser time as compared to‘without blanching’.The operative activation energy and moisture diffusivity are described by using Fick’s law of *** calculation of effective moisture diffusivity can be done via the utilization of *** drying data is subjected to two models of mathematical nature:Simple Exponential model,and Page *** performance of these models is examined by means of comparing the coefficient of determination(R2),chi-square(v2)and root mean square error(RMSE)between the experimental and forecasted value of moisture ratio obtained‘with blanching’and‘without blanching’.The experimental data was seen to be in accordance with the Page *** comparisons of energy consumption,energy efficiency and also the cost of the drying processes for‘with blanching’and‘without blanching’have been accomplished to optimize and reduce process condition and the cost of the process,respectively.

关键词： Hot air drying Green peas Drying kinetics Blanching Fluidized bed dryer

Ancient terrane boundaries as probable seismic hazards: A case study from the northern boundary of the Eastern Ghats Belt, India

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Geoscience Frontiers 2014年第1期5卷 17-24页

作者： Saibal Gupta William K.Mohanty Animesh Mandal Surajit misra Department of Geology and Geophysics Indian Institute of Technology KharagpurKharagpur 721302 West Bengal India

In the eastern part of the Indian shield, late Paleozoic-Mesozoic sedimentary rocks of the Talchir Basin lie precisely along a contact of Neoproterozoic age between granulites of the Eastern Ghats Mobile Belt （EGMB） and amphibolite facies rocks of the Rengali Province. At present, the northern part of the basin experiences periodic seismicity by reactivation of faults located both within the basin, and in the Rengali Province to the north. Detailed gravity data collected across the basin show that Bouguer anomalies decrease from the EGMB （~＋15 mGal）, through the basin （^-10 mGal）, into the Rengali Province （^-15 mGal）. The data are consistent with the reportedly uncompensated nature of the EGMB, and indicate that the crust below the Rengali Province has a cratonic gravity signature. The contact between the two domains with distinct sub-surface structure, inferred from gravity data, coincides with the North Orissa Boundary Fault （NOBF） that defines the northern boundary of the Talchir Basin. Post-Gondwana faults are also localized along the northern margin of the basin, and present-day seismic tremors also have epicenters close to the NOBF. This indicates that the NOBF was formed by reactivation of a Neo- proterozoic terrane boundary, and continues to be susceptible to seismic activity even at the present-day.

关键词： Eastern Ghats Mobile Belt Rengali Province Talchir Basin NOBF Bouguer anomaly Seismicity