Nabagram Hiralal Paul College

The present energy crisis demands integrated technologies capable of dual energy harvesting-storing functionality in a single device. In this work, a self-powered, hybridized, asymmetric supercapacitor is fabricated using MoO3-x nanoparticles as the electrode and NiO/PVDF-HFP porous piezoelectric separator as the energy harvesting component. The 2D nanopetal morphology, improved specific surface area (281.05 m(2) g(-1)), porosity, and abundant oxygen vacancies (23.6 %) in the MoO3-x nanoparticles result in excellent specific capacitance of 1144 F g(-1) at 2 A g(-1). Both symmetric (SSD) and asymmetric (ASD) all-solid supercapacitors are fabricated where the latter is found to present the superior specific energy density of 226.25 Wh Kg(-1) at 900 W Kg(-1). Novel theoretical simulations based on comparative time progression of the potential and current density vectors provide additional insights into the storage mechanism. Simultaneously, the piezoelectric NiO/PVDF-HFP nanocomposite is optimized to obtain a beta-phase of 55 % and porosity of similar to 75 %. The NiO/PVDF-HFP separator is integrated into the ASD and the performance of the hybridized device (S-ASD) is analysed through piezo-electrochemical spectroscopy. An excellent specific energy density of 119.25 Wh Kg(-1) at 900 W Kg(-1) is obtained for the S-ASD which varies from that of the ASD due to separator properties. Under periodic hand-tapping, the S-ASD exhibits a 34 % increase in specific capacitance at 50 mV s(-1). Further, a maximum self-charging voltage gain of 80 mV per mechanical tap is also obtained. Thus, the dual-active mode device, while having satisfactory independent electrochemical performance, also exhibits excellent self-charging properties suitable for practical applications.

NEISSERIA MENINGITIDIS: (Men) is one of the reasons of meningitis and sepsis worldwide. Mainly affected groups are children below five years and adolescents. Out of thirteen different Men-serogroups, disease causing invasive ones are the following six groups: A, B, C, W, X and Y. Epidemics and outbreaks by Men-strains are also reported to occur in several countries around the world. Based on the capsular polysaccharides of Men-strains (A, C, W and Y) conjugated with carrier proteins [Diphtheria toxoid (DT), CRM197 (a non-toxic mutant of DT) or Tetanus toxoid (TT)], several mono- and multi-valent vaccines were developed and licensed, which are still being used. Vaccines in the market against serogroup B are derived from MenB-proteins. Apart from these, several synthetic or semi-synthetic glycoconjugate-vaccine candidates against the disease-causing Men-serogroups are still under development or under pre-clinical or clinical trials. This minireview will encompass an overview mainly of the chemical syntheses of such semi-synthetic or synthetic glycoconjugates as Men-vaccine candidates.

The study of thermodynamics in the background of the “extended uncertainty principle (EUP)” comes into interest in recent eras. In this article, we consider a charged black hole (BH) in higher dimensional space–time and present the thermodynamic parameters, based on a semiclassical framework, initially. Then we extend the same within the EUP background. We also analyze the Q−ϕ criticality and find the critical points (ϕc,Qc and Tc) when Q−ϕ criticality appears. We study the effects of EUP on phase transition for higher dimensions (d=5) by plotting the Q−ϕ diagrams. Further, we investigate the stability (thermal and global) of the BHs by employing the specific heat and the Gibbs free energy without and within EUP correction and compare the results with the Schwarzschild BHs in higher dimensions.

In addition to the classical definition of the black hole’s entropy, quantum mechanics requires several modifications of it. In this article, we consider the higher-order quantum correction in entropy and analyze the thermodynamic properties of a black hole solution which is sitting in one of the modified gravity theories, viz. Gauss-Bonnet gravity, in this point of view. Here mainly two thermodynamic potentials, Gibbs free energy and Helmholtz free energy are studied. As both potentials are very much important to investigate small/large black hole phase transition. Presenting the variations of higher-order corrected Gibbs free energy and Helmholtz free energy in different conditions, we analyze the phase transition and critical behavior of said black holes. We also re-examine our results, with the P-V criticality analyses and study P-r_+ diagrams. Moreover, we compute the critical temperature, pressure and volume and the relation among them. Here we find an interesting result for Q=0 and for the Ricci flat horizon of this black hole that the relation is exactly equal to the result obtained for the van der Waals system. Further, we study thermal stability by computing the specific heat with higher-order correction and explain it by depicting the C_HC vs r_+ diagrams in different conditions.

The concept of ideal society largely depends on one’s perception, experience and interactions with the given society. Thus it is ‘contextual’ and ‘relational’ in reality. While reality determines the nature of one’s ideas, the transformation of his ideas gets denials from traditional perceptions, taboos and vested interests. All these features of ideas and activism have been found in the lives and works of Panchanan Barma (1865–1935) and Dr B. R. Ambedkar (1890–1956). Both of them were the products of their times. Thus their ideas on an ideal society got maturity through the interactions with their contemporary society. Hence, their attempts at attaining ‘justice’ and ‘equality’ for an ‘ideal society’ were the outcome of their ideas on ‘just society’ and ‘equality’ and finding probable ways for attaining ‘self-reliance’ to fight against injustice. This article seeks to analyse the concept of social justice of Panchanan Barma (the father of the Rajbanshi community of Bengal) and to compare it with that of Dr B. R. Ambedkar (who has been accepted as the ‘Father of the Indian Constitution’).