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Na_2O·8TeO_2晶相的转变分解机理探索

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稀有金属材料与工程 2007年第A02期36卷 309-311页

作者：朱冬梅罗发周万城 chandra s.ray Delbert E.Day 西北工业大学凝固技术国家重点实验室 Ceramic Engineering Department and Graduate Center for Materials Research University of Missouri-RollaRollaMO65401USA

以Na_2O-TeO_2玻璃系统中发现的一个新晶相Na_2O·8TeO_2(NT_8)为研究对象,通过热分析和X-射线衍射等分析手段,着重探讨了该晶相的形成条件和分解条件,分析了该晶相发生转变的过程和机理。结果发现该晶相在330℃下能够稳定存在,而在330... 详细信息

以Na_2O-TeO_2玻璃系统中发现的一个新晶相Na_2O·8TeO_2(NT_8)为研究对象,通过热分析和X-射线衍射等分析手段,着重探讨了该晶相的形成条件和分解条件,分析了该晶相发生转变的过程和机理。结果发现该晶相在330℃下能够稳定存在,而在330～340℃之间则会分解成Na_2O·4TeO_2(NT_4)和TeO_2两种晶体。在由NT_8向NT_4和TeO_2的转变过程中出现了两个热效应,先是一个吸热反应,然后是一个放热反应,这说明在NT_8向NT_4和TeO_2的转变过程中,出现了一个中间相,该中间相为一种非晶相。作者认为,NT_8向NT_4和TeO_2的转变分为两个步骤,第一步是由NT_8向中间非晶相的转变,第二步是中间非晶相向NT_4和TeO_2的转变,而且由NT_8向中间相转变的过程与由中间相向NT_4和TeO_2转变的过程是同时进行的。

关键词： Na2O·8TeO2晶体热分解非晶相

不同熔化条件对Na_2O·4TeO_2玻璃性能的影响

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西北工业大学学报 2003年第3期21卷 348-351页

作者：朱冬梅罗发周万城 chandra s.ray 西北工业大学凝固技术国家重点实验室陕西西安710072 Graduate Center for Materials Research University of Missouri-Rolla

探索了不同熔化条件对 Na2 O· 4Te O2 玻璃性能的影响 ,确定了 Na2 O- Te O2 系统玻璃的合理的熔化条件。通过热分析和红外分析等手段 ,对由不同原料在不同熔化条件下所得到的玻璃进行了分析 ,发现熔化条件不同时 ,由不同原料所得玻璃... 详细信息

探索了不同熔化条件对 Na2 O· 4Te O2 玻璃性能的影响 ,确定了 Na2 O- Te O2 系统玻璃的合理的熔化条件。通过热分析和红外分析等手段 ,对由不同原料在不同熔化条件下所得到的玻璃进行了分析 ,发现熔化条件不同时 ,由不同原料所得玻璃的性能也有很大差别。当熔化温度较低、熔化时间较短时 ,玻璃中存在未分解完全的来自原料的原子基团。由不同原料所得的玻璃的 DsC曲线和抗析晶能力差别很大。随着熔化温度的升高和熔化时间的延长 ,由不同原料熔化所得玻璃的性能趋于一致。在 80 0℃下熔化 1

关键词：亚碲酸钠熔化条件性能

New analytical exact solutions of time fractional KdV KZK equation by Kudryashov methods

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Chinese Physics B 2016年第4期25卷 30-36页

作者： s saha ray National Institute of Technology Department of Mathematics

In this paper, new exact solutions of the time fractional KdV-Khokhlov-Zabolotskaya-Kuznetsov （KdV-KZK） equa- tion are obtained by the classical Kudryashov method and modified Kudryashov method respectively. For this purpose, the modified Riemann-Liouville derivative is used to convert the nonlinear time fractional KdV-KZK equation into the non- linear ordinary differential equation. In the present analysis, the classical Kudryashov method and modified Kudryashov method are both used successively to compute the analytical solutions of the time fractional KdV-KZK equation. As a result, new exact solutions involving the symmetrical Fibonacci function, hyperbolic function and exponential function are obtained for the first time. The methods under consideration are reliable and efficient, and can be used as an alternative to establish new exact solutions of different types of fractional differential equations arising from mathematical physics. The obtained results are exhibited graphically in order to demonstrate the efficiencies and applicabilities of these proposed methods of solving the nonlinear time fractional KdV-KZK equation.

关键词： KdV-Khokhlov-Zabolotskaya-Kuznetsov equation Kudryashov method modified Kudryashovmethod fractional complex transform modified Riemann-Liouville derivative

Cr_2O_3对高放核废料磷酸盐玻璃固化体的影响

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无机材料学报 2005年第4期20卷 842-850页

作者：黄文旵周萘 Day Delbert E ray chandra s 同济大学材料学院 University of Missouri-Rolla Rolla MO 65409USA

在含高放核废料的玻璃固化体中添加了不同含量的Cr2O3,以考察其对玻璃固化体的结构和性质的影响.对添加Cr2O3的玻璃固化体进行了各种方法(溶出速率法,蒸汽水化侵蚀和试样坚固性法)的化学稳定性的测试.测试结果表明,Cr2O3的引入不会对玻... 详细信息

在含高放核废料的玻璃固化体中添加了不同含量的Cr2O3,以考察其对玻璃固化体的结构和性质的影响.对添加Cr2O3的玻璃固化体进行了各种方法(溶出速率法,蒸汽水化侵蚀和试样坚固性法)的化学稳定性的测试.测试结果表明,Cr2O3的引入不会对玻璃固化体的化学稳定性产生不良的影响.与此相反,Cr2O3能抑制各种离子自玻璃固化体中沥析出来, 改善玻璃固化体的化学耐蚀性. XRD内标法测定,Cr2O3在铁磷酸盐玻璃中的溶解度可达4.1%,是其在硼硅酸盐玻璃的3倍. FTIR和DTA的结果表明,不同含量的Cr2O3的引入, 不会对玻璃固化体的网络结构造成显著的变化. Mossbauer谱表明,Fe2+/Fe3+的比值随着Cr2O3的含量的增加而增大,说明Cr离子和Fe离子在玻璃熔制过程中发生氧化还原反应, 形成的Cr+6有利于提高玻璃固化体的化学耐蚀性.

关键词：铁磷玻璃氧化铬核废料处理化学稳定性

A Novel Approach with Time-splitting spectral Technique for the Coupled schrdinger–Boussinesq Equations Involving Riesz Fractional Derivative

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Communications in Theoretical Physics 2017年第9期67卷 301-308页

作者： s.saha ray Department of Mathematics National Institute Technology

In the present paper the Riesz fractional coupled schr6dinger-Boussinesq （s-B） equations have been solved by the time-splitting Fourier spectral （TsFs） method. This proposed technique is utilized for discretizing the schrodinger like equation and further, a pseudospectral discretization has been employed for the Boussinesq-like equation. Apart from that an implicit finite difference approach has also been proposed to compare the results with the solutions obtained from the time-splitting technique. Furthermore, the time-splitting method is proved to be unconditionally stable. The error norms along with the graphical solutions have also been presented here.

关键词： coupled schrsdinger-Boussinesq equations Riesz fractional derivative discrete fourier transform inverse discrete Fourier transform

Electro-osmotic flow of a second-grade fluid in a porous microchannel subject to an AC electric field

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Journal of Hydrodynamics 2013年第2期25卷 309-316页

作者： MIsRA J. C. chandra s. Department of Mathematics Institute of Technical Education and Research Siksha O Anusandhan University Department of Physics Sabang S. K. Mahavidyalaya Vidyasagar University

studies on electro-osmotic flows of various types of fluids in microchannel are of great importance owing to their multifold applications in the transport of liquids, particularly when the ionized liquid flows with respect to a charged surface in the presence of an external electric field. In the case of viscoelastic fluids, the volumetric flow rate differs significantly from that of Newtonian fluids, even when the flow takes place under the same pressure gradient and the same electric field. With this end in view, this paper is devoted to a study concerning the flow pattern of an electro-osmotic flow in a porous microchannel, which is under the action of an alternating electric field. The influence of various rheological and electro-osmotic parameters, e.g., the Reynolds number, Debye-Huckel parameter, shape factor and fluid viscoelasticity on the kinematics of the fluid, has been investigated for a secondgrade viscoelastic fluid. The problem is first treated by using analytical methods, but the quantitative estimates are obtained numerically with the help of the software MATHEMATICA. The results presented here are applicable to the cases where the channel height is much greater than the thickness of the electrical double layer comprising the stern and diffuse layers. The study reveals that a larger value of the Debye-Huckel parameter creates sharper profile near the wall and also that the velocity of electro-osmotic flow increases as the permeability of the porous microchannel is enhanced. The study further shows that the electro-osmotic flow dominates at lower values of Reynolds number. The results presented here will be quite useful to validate the observations of experimental investigations on the characteristics of electro-osmotic flows and also the results of complex numerical models that are necessary to deal with more realistic situations, where electro-osmotic flows come into the picture, as in blood flow in the micro-circulatory system subject to an elect

关键词： electrical double layer Debye length second-grade fluid Ionic energy

p53:updates on mechanisms,biology and therapy(Ⅰ)

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Journal of Molecular Cell Biology 2019年第4期11卷 185-186页

作者： chandra s.Verma Bioinformatics Institute Agency for ScienceTechnology and Research(A*STAR)Singapore 138671 Department of Biological sciences National University of SingaporeSingapore 117543 school of Biological sciences Nanyang Technological UniversitySingapore 637551

In July 2017,the 17th International p53 Workshop was held in *** an attendanee of over 300 scientists from all over the world,the meeting was an outstanding success and many new observations about the p53 pathway were discussed for the first *** enthusiasm to gather these in sights into a form that would be available to the whole community led us and the editors of Journal of Molecular Cell Biology to design a special issue of the journal composed of articles and commentaries from some of the key contributors to the meeting.

关键词： p53 mechanisms biology and therapy

New Exact solutions for the Wick-Type stochastic Kudryashov–sinelshchikov Equation

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Communications in Theoretical Physics 2017年第2期67卷 197-206页

作者： s.saha ray s.singh Department of Mathematics National Institute Technology Rourkela Orissa-769008 India

In this article, exact solutions of Wick-type stochastic Kudryashov–sinelshchikov equation have been obtained by using improved sub-equation method. We have used Hermite transform for transforming the Wick-type stochastic Kudryashov–sinelshchikov equation to deterministic partial differential equation. Also we have applied inverse Hermite transform for obtaining a set of stochastic solutions in the white noise space.

关键词： Kudryashov–sinelshchikov Wick-product White noise space improved sub-equation method Hermite transform inverse Hermite transform

Higher-order approximate solutions of fractional stochastic point kinetics equations in nuclear reactor dynamics

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Nuclear science and Techniques 2019年第3期30卷 114-126页

作者： s.singh s.saha ray Department of Mathematics National Institute of Technology Rourkela

stochastic point kinetics equations(sPKEs) are a system of Ito? stochastic differential equations whose solution has been obtained by higher-order *** this study, a fractional model of sPKEs has been analyzed. The efficiency of the proposed higher-order approximation scheme has been discussed in the results section. The solutions of sPKEs in the presence of Newtonian temperature feedback have also been provided to further discuss the physical behavior of the fractional model.

关键词： Fractional stochastic point reactor kinetics equations Fractional calculus Higher-order approximation Caputo derivative Neutron population