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On the high temperature phase transition in Ba(Zr_(0.20)ti_(0.80))O_(3) ceramic

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Journal of Advanced Dielectrics 2017年第4期7卷 22-28页

作者： K.P.Chandra A.R.Kulkarni K.Prasad department of physics S.M.College Bhagalpur 812001India department of metallurgical Engineering and materials Science Indian Institute of technology Mumbai 400076India university department of physics t.m.bhagalpur university Bhagalpur 812007India

temperature dependent X-ray diffraction(XRD)and dielectric properties of perovskite Ba(Zr_(0.2)ti_(0.8))O_(3) ceramic prepared using a standard solid-state reaction process is *** with phase transitions at low temperature,a new phase transition at high temperature(873℃ at 20 Hz),diffusive in character has been found where the lattice structure changes from monoclinic(space group:P2=m) to hexagonal(space group:P6=mmm).this result places present ceramic in the list of potential candidate for intended high temperature *** AC conductivity data followed hopping type charge conduction and supports jump relaxation *** experimental value of d_(33)=98 pC/N was *** dependence of polarization and strain on electric field at room temperature suggested that lead-free Ba(Zr_(0.2)ti_(0.8))O_(3) is a promising material for electrostrictive applications.

关键词： Lead-free ceramic structure dielectric properties phase transition AC conductivity piezoelectric electrostriction

Electrical and magnetic properties of 0-3 Ba(Fe_(1/2)Nb_(1/2))O_(3)/PVDF composites

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Journal of Advanced Dielectrics 2017年第6期7卷 1-11页

作者： Hars Ranjan Uttam K.mahto K.P.Chandra A.R.Kulkarni A.Prasad K.Prasad Aryabhatta Centre for Nanoscience and Nanotechnology Aryabhatta Knowledge University Patna 800001India department of physics S.M.CollegeBhagalpur 812001India department of metallurgical Engineering and materials Science Indian Institute of technology Mumbai 400076India university department of physics T.M.Bhagalpur UniversityBhagalpur 812007India

Lead-free Ba(Fe_(1/2)Nb_(1/2))O_(3)/PVDF O_(3) composites were fabricated using *** technique.X-ray diffraction,scanning electron microscopy,dielectric,impedance,ac conductivity,magnetic force microscopy(mFm)and vibrating sample magne-tometer studies were undertaken to characterize the *** crstallite size of the Ba(Fe_(1/2)Nb_(1/2))O_(3) powder,estimated using Williamson-Hall approach,was found to be~42 *** fller particles of~0.5-1 pum were found to disperse in the polymer matrix of all the *** concentration dependent values of real and imaginary parts of complex permittivity showed increasing trend and were seen to follow Bruggeman and Furukawa *** data for ac conductivity exhibited negative temperature coeficient of resistance character of the test materials and were found to obey Jonscher's power *** correlated barier hopping model was found to explain satisfactorily the mechanism of charge transport occurring in the *** confirmed the presence of magnetic phases in the *** magnetization versus applied field curves indicated the possibility of magnetoelectric coupling in the ***,the present composites have shown themselves as potential multi-functional candidate materials for use in high density data storage applications.

关键词： Random composite medium dielectric properties magnetic properties effective permittivity magnetic force microscopy

Electrical properties of 0-30.5(Ba_(0.7)Ca_(0.3))tiO_(3)-0.5Ba(Zr_(0.2)ti_(0.8))O_(3)/PVDF nanocomposites

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Journal of Advanced Dielectrics 2018年第4期8卷 35-42页

作者： Bablu K.Pandey Amit Kumar K.P.Chandra A.R Kulkarni S.K Jayaswal K.Prasad university department of physics t.m.bhagalpur university bhagalpur 812007 India department of mechanical Engineering Birla Institute of technology mesra(Patna Campus) Patna 800014India department of physics S.M.College Bhagalpur 812001India department of metallurgical Engineering and materials Science Indian Institute of technology mumbai 400076 India

Lead-free x(0.50(Ba_(0.7)Ca_(0.3)tiO_(3)-0.50Ba(Zr_(0.2)ti_(0.8)O_(3)-(1-x)PVDF ceramic–polymer nanocomposites with x=0.025,0.05,0.10,0.15,0.20,0.25 were prepared using melt-mixing *** distribution of nanoceramic filler particles(0.50(Ba_(0.7)Ca_(0.3)tiO_(3)-0.50Ba(Zr_(0.2)ti_(0.8)O_(3)in the PVDF matrix were examined using scanning electron *** analysis indicated the negative temperature coefficient of resistance character of all the test *** concentrationdependent piezoelectric coefficient(d33Þdata followed exponential growth types of *** data for ac conductivity were found to obey Jonscher’s power *** correlated barrier hopping(CBH)model was found to explain the mechanism of charge transport occurring in the *** low value of loss tangent(-10^(-2))along with the high value of d_(33) foreshadowing the prospect of present nanocomposite is a better nonlead option for piezo-sensing/detection applications,especially in bio-medical area.

关键词： Random composite medium dielectric properties piezoelectric properties impedance analysis.

Expression of a Bacterial Chitinase (ChiB) Gene Enhances Resistance against Erysiphae polygoniInduced Powdery mildew Disease in the transgenic Black Gram (Vigna mungoL.) (cv. t9)

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American Journal of Plant Sciences 2018年第8期9卷 1759-1770页

作者： D.K.Das Post Graduate department of Biotechnology T.M.Bhagalpur UniversityBhagalpurIndia

to enhance the antifungal response of blackgram (Vigna mungo L.), transgenic plants were generated by transferring bacterial chitinase gene with a CamV 35S promoter. the chopped multiple shoot cells developed on the cotyledonary node were transformed by Particle gun method. thecalli were raised on the murashige and Skoog (mS) modified media supplemented with 50 m·gl-1 kanamycin. the transformation efficiency was 13% approximately. the resultant shoot buds were selected and the antibiotic resistant transgenic plantlets were regenerated. the development of the transgenic plants from the shoot buds took about four to six months. the integration of the transgene was confirmed by PCR, Rt-PCR, Southern and western blot analyses. the transgenic plants exhibited higher chitinase activity than the non-transformed ones. the chitinase activity was examined by native polyacrylamide in-gel assay. the transgenic plants showed fungal tolerance as evidenced by the delayed onset of the disease and smaller lesions following an in vitro inoculation of the powdery mildew pathogen (Erysiphae polygoni DC). the transgenic plants adapted well to the greenhouse and did not show any phenotypic alterations.

关键词： Particle Gun Bombardment Organogenesis Powdery mildew transformation Erysiphae polygoni DC

Change in Internal Energy and Enthalpy of Spinning Black Hole with Half Spin Parameter in XRBs

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International Journal of Astronomy and Astrophysics 2016年第3期6卷 328-333页

作者： Dipo mahto Amresh Kumar Singh Niharika Kumari department of physics Marwari College Bhagalpur T. M. B. University Bhagalpur India department of physics T. M. B. University Bhagalpur India

mahto et al. gave an expression for the change in enthalpy and internal energy with corresponding change in the radius of the event horizon of black holes of spin parameter a* = 1 (2013). On the basis of this research work, we have proposed an expression for the change in the internal energy and enthalpy of the spinning black holes to assume spin parameter a* = 1/2 and calculated their values for different test spinning black holes existing in XRBs.

关键词： Enthalpy Spinning Black Holes Internal Energy

Synthetic Seed Preparation, Germination and Plantlet Regeneration of Litchi (Litchi chinensis Sonn.)

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American Journal of Plant Sciences 2016年第10期7卷 1395-1406页

作者： D. K. Das A. Rahman Dipti Kumari Nutan Kumari Post Graduate department of Biotechnology T.M. Bhagalpur University Bhagalpur India

Litchi chinensis sonn.) ranks second after mango amongst the most important fruit crops cultivated worldwide. Litchi is a very valuable crop throughout the world because it is a table fruit and wines are also produced from it. the existing cultivars are highly polyploidy and heterozygous in nature. It is propagated through air layering and marcottage methods and storability is very low. Synthetic seeds can be stored for a long time and its genetic constitution could remain the same. For germplasm maintenance and clonal propagation, synthetic seeds can be used. Somatic embryogenesis has been reported from anther or embryogenic suspension culture in various species of litchi. Regeneration via organogenesis and somatic embryogenesis from zygotic embryos has also been reported in certain species. Developing a methodology for getting somatic embryogenesis with a high frequency from zygotic embryos which is available once in a year, would be particularly useful for genetic improvement of litchi. Cotyledonary stage somatic embryos developed from zygotic embryos were encapsulated in 2% alginate gel. the encapsulated somatic embryos (ESEs) germinated successfully on 0.7% agar medium containing 3% sucrose concentration in NN basal medium (half strength of major and minor salts) with 1 mg·l-1 of gibbrellic acid. Percentage germination and plantlet development for ESEs was higher than that of non encapsulated embryos (NSEs). In comparison to different hormones, gibberellic acid has a significant influence on the germination rate of ESEs after one week of dehydration was seen maximum at 9% sucrose and abscisic acid (1 mg·l-1) in half strength of major and minor salts in Nitsch and Nitsch medium resulting in extended storage up to 90 days without loss in germination potential and capability to regenerate into plantlets. Normally developed plantlets regenerated from ESEs were successfully adapted to soil to obtain a full grown plant.

关键词： Encapsulation Germination Plantlet Regeneration Somatic Embryos

Periodic Orbits of the First Kind in the CR4BP When the Second Primary Is a triaxial Rigid Body

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International Journal of Astronomy and Astrophysics 2017年第3期7卷 133-153页

作者： m. R. Hassan Payal Singh md. Aminul Hassan department of mathematics S. M. College T. M. Bhagalpur University Bhagalpur India t. m. bhagalpur university Bhagalpur India GtE Bangalore India

the present paper deals with the existence of periodic orbits in the Circular Restricted Four-Body Problem (CR4BP) in two-dimensional co-ordinate system when the second primary is a triaxial rigid body and the third primary of inferior mass (in comparison of the other primaries) is placed at triangular libration point L4 of the Circular Restricted three-Body Problem (CR3BP). With the help of generating solutions, we formed a basis for the existence of periodic orbits, then an analytical approach given by Hassan et al. [1], was applied to our model of equilateral triangular configuration. It is found that in general solution also;the character of periodic orbits is conserved. For verification of the existence of periodic orbits, we have applied the criterion of Duboshin [2] and found satisfied.

关键词： Autonomous Four-Body Problem CR4BP triaxial Rigid Body Regularization Generating and General Solution Periodicity

Change in Internal Energy and Enthalpy of Spinning Black Holes in XRBs and AGN Using Spin Parameter a* = 0.9

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International Journal of Astronomy and Astrophysics 2017年第1期7卷 38-44页

作者： Dipo mahto Alok Ranjan Niharika Kumari department of physics Marwari College T. M. B. University Bhagalpur India department of physics T. M. B. University Bhagalpur India

In the present research work, we have proposed a model for the change in the internal energy and enthalpy of the spinning black holes using first law of black holes in the case of spin parameter a*=0.9 and calculated ... 详细信息

关键词： Surface Gravity Enthalpy Spinning Black Holes and AGN

Boosting hydrocarbon conversion via Cu-doping induced oxygen vacancies on CeO2 in CO2 electroreduction

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Journal of Energy Chemistry 2025年第1期100卷 66-76页

作者： Lei Xue tong Shi Chenhui Han Heng Zhang Fenrong Liu Haorun Li Yan Wang Xiaojun Gu Shanghong Zeng Inner mongolia Key Laboratory of Chemistry and physics of Rare Earth materials School of Chemistry and Chemical Engineering Inner Mongolia University State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences Institute of Catalysis Department of Chemistry Zhejiang University National Key Laboratory of Baiyunobo Rare Earth Resource Research and Comprehensive Utilization Baotou Research Institute of Rare Earths

Conversion of CO2back to hydrocarbons is the most direct way of closing the“carbon cycle”,and its significance is further enlarged if this process is driven by renewable energies such as ***,precisely controlling the product selectivity towards hydrocarbons against the competitive hydrogen evolution remains challenging,especially for Cu-based ***,we report a novel defect engineering strategy,by which Cu-doping-induced oxygen vacancies on CeO2nanorods were effectively created,with adjustable vacancy/Cu *** resulting optimum catalyst shows up to 79% catalytic current density to hydrocarbons （excluding CO）,with 49% faradaic efficiency to *** and density functional theory unveil that the ratio between oxygen vacancy and Cu affects significantly the formation of*CHO and activation of H2O,which leads to the following deep hydrogenation to *** findings may spur new insights for designing and developing more controllable chemical process relevant to CO2utilization.

关键词： Nanorods