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Structural-Nanomechanical Property Correlation of Shallow Water Shrimp （Pandalus platyceros） Exoskeleton at Elevated Temperature

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Journal of Bionic Engineering 2014年第3期11卷 360-370页

作者： devendra verma vikas tomar School of Aeronautics and Astronautics Purdue University West Lafayette IN 47907 USA

This investigation reports the nanomechanical properties of shallow water shrimp exoskeleton at temperatures ranging from 30 ℃ to 80 ℃ measured using nanoindentation experiments. Scanning Electron Microscopy （SEM） measurements suggest that the shrimp exoskeleton has the Bouligand structure in its layers, a key characteristic of the crustaceans. The thickness of the layers and packing density are found to be different from that of lobsters and crabs reported earlier in the literature. Mechanical properties at high temperatures are determined using micro materials nanoindentation test set up combined with the hot stage. The properties measured during nanoindentation test are corrected for the creep and thermal drift during the experiments. The reduced modulus values are found to be around 28 GPa at 30 ℃ that reduces to approximately 24 GPa at 80 ℃. The hardness values also decrease from 1.6 GPa at 30 ℃ to around 1.2 GPa at 80 ℃. The indentation size effect is found to be absent at all temperatures. Creep mechanisms of polymers like materials and its temperature dependence are discussed to give more insight into the deformation mechanism.

关键词： fresh water shrimp nanomechanics temperature dependence creep mechanism

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Numerical study of fractional model of multi-dimensional dispersive partial differential equation

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Journal of Ocean Engineering and Science 2019年第4期4卷 338-351页

作者： Vijay verma Amit Prakash devendra Kumar Jagdev Singh Department of Mathematics Pt.C.L.S.Govt.(PG)CollegeKarnalHaryanaIndia Department of Mathematics National Institute of TechnologyKurukshetra 136119India Department of Mathematics University of RajasthanJaipur 302004RajasthanIndia Department of Mathematics JECRC UniversityJaipur 303905RajasthanIndia

This article is devoted to a newly introduced numerical method for time-fractional dispersive partial differential equation in a multidimensional *** time-fractional dispersive partial differential equation plays a great role in solving the problems arising in ocean science and *** numerical technique comprises of Sumudu transform,homotopy perturbation scheme and He’s polynomial,namely homotopy perturbation Sumudu transform method(HPSTM)is efficiently used to examine time-fractional dispersive partial differential equation of third order in multi-dimensional *** approximate analytic solution of the time-fractional dispersive partial differential equation of third-order in multi-dimensional space obtained by HPSTM is compared with exact solution as well as the solution obtained by using Adomain decomposition *** results derived with the aid of two techniques are in a good agreement and consequently these techniques may be considered as an alternative and efficient approach for solving fractional partial differential *** test problems are experimented to confirm the accuracy and efficiency of the proposed methods.

关键词： Homotopy perturbation method Fractional trigonometric function He’s polynomials Adomian decomposition method Sumudu transform

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所有的疾病都始于肠道

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国外畜牧学（猪与禽） 2017年第11期37卷 24-25页

作者：赵瑜张配配 devendra verma 信阳农林学院牧医工程学院 Perstorp饲料与食品公司业务发展部

仔猪断奶后生长滞后时间可长达7 d^10 d。然而,部分管理良好的猪场可将之控制到1 d^2 d。了解仔猪在这一期间其胃肠道发生了什么是控制这些问题的第一步。

关键词：仔猪断奶滞后时间胃肠道滞后期肠道功能出栏体重肠道炎症日增重肠黏膜屏障免疫功能

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