Golaghat Commerce College is a leading higher education institution established on 9 October 1972 at Jyoti Nagar, Golaghat of the Golaghat district of Upper Assam, India. Affiliated to Dibrugarh University, the college has various departments running Higher Secondary and undergraduate courses both in Commerce and Arts.
The linear and nonlinear propagation of dust–acoustic waves in an inhomogeneous dusty plasma with nonthermal electrons and ions is investigated. The effects of electron and ion nonthermality, equilibrium plasma densities, dust charge, and temperature ratio are included. By applying the reductive perturbation method, we derive a damped Korteweg–de Vries equation governing the nonlinear evolution of the dust-acoustic mode. The resulting equation and its analytical solution are examined in detail. The soliton amplitude exhibits a non-monotonic dependence on the nonthermal parameters, attaining a maximum at intermediate values as a result of the competition between nonlinearity and dispersion. The results emphasize the joint influence of plasma inhomogeneity, nonthermal populations, and dust charging on dust–acoustic wave dynamics, and they may be tested against contemporary experimental observations in complex plasmas. In several limiting cases, the present results reduce to previously reported models, and the findings are applicable to both laboratory and space dusty plasma studies.
We present a theoretical model to investigate the nonlinear behavior of gravito-electrostatic fluctuations in an unmagnetized self-gravitating visco-elastic dusty plasma of infinite extension. It is composed of five distinct species: nonthermal lighter (inertialess) components–electrons, positive ions, and negative ions–and thermal heavier (inertial) components–neutral and charged dust grains. Applying nonlinear normal mode analysis, we derive a unique pair of extended Korteweg–de Vries–Burgers (KdV–B) equations that describe the hybridized dynamics of coupled gravito-electrostatic potential fluctuations. A judicious numerical platform is constructed to understand the exact nature of the fluctuation dynamics. It is reviewed that the KdV-B system manifests as electrostatic narrow solitary spectral patterns and the corresponding self-gravitational broad counterparts. The steady-state nature of the fluctuation dynamics is found to be sensitively dependent on diverse plasma parameters. Astronomical applicability of the investigated results in light of current observational missions is finally outlined.
The study examines the prospects of integrating India’s North Eastern Region (NER) into ASEAN’s Regional and Global Value Chains and focusing on how regional linkages can transform a landlocked NER into an economically vibrant trade hub. The study takes into consideration ASEAN’s policy frameworks, sectors and connectivity strategies applicable to the NER’s trade integration with ASEAN. It also evaluates comparative advantage sectors, trade facilitation measures, and institutional mechanisms that can enable the NER’s participation in ASEAN-led production networks. Methodologically, the study adopts an exploratory and descriptive research design using secondary data drawn from UNCTAD stat, OECD TiVA, WITS, ASEANstats, and India’s Ministry of Commerce. The study findings reveal that ASEAN’s success in regional value chains has been driven by harmonized trade policies, infrastructural investments, and sector-specific cooperation, particularly in manufacturing, electronics, and Agri-based industries. The NER which has huge potentials and with natural resources, biodiversity, and locational proximity to Southeast Asia, can leverage this experience to strengthen its export competitiveness with ASEAN.
We investigate the nonlinear evolution of dust–acoustic waves (DAWs) in self-gravitating, magnetized opposite-polarity dusty plasmas (OPDP). The system consists of positively and negatively charged dust, Tribeche-type nonthermal ions, degenerate electrons, and inertial cold dust. By employing the Reductive Perturbation Method, we derive a KdV equation that uniquely incorporates electron trapping, dust polarity, magnetization, and self-gravitational effects. Our analysis reveals that these factors critically determine the amplitude, width, polarity, and stability of DAW solitary structures, with electrostatic fluctuations forming compressive solitons and gravitational fluctuations forming rarefactive solitons. These findings provide new insights into mass localization and gravito-electrostatic coupling in dense astrophysical plasmas. The results also establish a predictive framework for laboratory dusty plasma experiments under strong magnetization and self-gravitating conditions.
A semi-analytical model theory is proposed to investigate the nonlinear pulsational mode dynamics in self-gravitating, turbo-viscous tridust plasmas composed of nonthermal electrons and ions. The approach employs multiple scaling techniques on the governing fluid equations, based on a well-defined hydrostatic, homogeneous equilibrium configuration, to derive a unique pair of extended Korteweg–de Vries (e-KdV) equations. This pair features two distinct sets of multi-parametric coefficients that govern the behavior of gravito-electrostatic (pulsational) fluctuations. A broad spectrum of solitary wave structures is obtained through numerical simulation and systematically analyzed. The study further elucidates the stabilization and destabilization characteristics of these pulsational modes under varying parametric conditions. Finally, the noticeable implications and potential applications of the outcomes in astrostructure formation mechanisms, are briefly highlighted.
