Curvature-Matter Coupling Effects on Axial Gravitational Waves

In this paper, we investigate the propagation of axial gravitational waves in the background of the flat FRW universe in $f(R,T)$ theory. The field equations are obtained for unperturbed as well as axially perturbed FRW metric. These field equations are solved simultaneously to obtain the unknown perturbation parameters. We find that the assumed perturbations can affect matter as well as four-velocity. Moreover, ignoring the material perturbations we explicitly obtain an expression for four-velocity. It is concluded that axial gravitational waves in the curvature-matter coupling background can produce cosmological rotation or have memory effect if the wave profile has a discontinuity at the wavefront.Comment: 17 pages, no figure, to appear in EPJ

Analisis Kelayakan Bisnis Pengembangan Usaha Startup

The rapid growth of the global startup ecosystem has created many opportunities and challenges. The purpose of this study is to analyze the business feasibility of startup business development. The research method used is a literature study or Library Research with a qualitative approach. The literature used is literature from research results or reviews presented in national and international scientific articles related to startups. The results showed that this analysis is a critical stage that helps startup founders to understand whether their business idea has the potential to succeed in a competitive business environment. By evaluating components such as market, financial, technical, management, and risk, business feasibility analysis provides a deep understanding of the potential and challenges that startups may face. Keywords: Business feasibility, Enterprise development, Startu

Models of Collapsing and Expanding Cylindrical Source in f(R,T) Theory

We discuss the collapsing and expanding solutions of anisotropic charged cylinder in the context of $f(R,T)$ theory ($R$ represents the Ricci scalar and $T$ denotes the trace of energy-momentum tensor). For this purpose, we take an auxiliary solution of Einstein-Maxwell field equations and evaluate expansion scalar whose negative values lead to collapse and positive values give expansion. For both cases, the behavior of density, pressure, anisotropic parameter as well as mass is explored and the effects of charge as well as model parameter on these quantities are examined. The energy conditions are found to be satisfied for both solutions.Comment: 29 pages, 22 figures, to appear in AHE

MHD free convection-radiation interaction in a porous medium - part I : numerical investigation

A numerical investigation of two dimensional steady magnetohydrodynamics heat and mass transfer by laminar free convection from a radiative horizontal circular cylinder in a non-Darcy porous medium is presented by taking into account the Soret/Dufour effects. The boundary layer conservation equations, which are parabolic in nature, are normalized into non-similar form and then solved numerically with the well-tested, efficient, implicit, stable Keller–Box finite-difference scheme. We use simple central difference derivatives and averages at the mid points of net rectangles to get finite difference equations with a second order truncation error. We have conducted a grid sensitivity and time calculation of the solution execution. Numerical results are obtained for the velocity, temperature and concentration distributions, as well as the local skin friction, Nusselt number and Sherwood number for several values of the parameters. The dependency of the thermophysical properties has been discussed on the parameters and shown graphically. The Darcy number accelerates the flow due to a corresponding rise in permeability of the regime and concomitant decrease in Darcian impedance. A comparative study between the previously published and present results in a limiting sense is found in an excellent agreement

A NEW FACET TO US-CHINA RIVALRY: BUILD BACK BETTER WORLD VERSUS BELT AND ROAD INITIATIVE

The new world order has been instrumental in determining and promoting multilateralism, and as a result, the world has undergone several transformations in the past few decades. Amidst heightened US-China tension, President Biden unveiled the Build Back Better World (B3W) project during the 2021-G7 meeting. The following year it was re-branded as the Partnership for Global Infrastructure and Investment. While it has not been explicitly stated, B3W aims to counter China's multi-billion Belt and Road Initiative (BRI). Understanding B3W vs. BRI debate is important for countries, especially those in the Middle East who already perform a balancing act between the US and China. This paper assesses B3W vs. BRI debate with particular reference to the Middle East. After evaluating the contradictions and complementarities between the two projects, this paper concludes that B3W will only benefit Middle Eastern countries if it aligns with BRI, where strategic objectives and interests make parallel, such as in the avenues of cyber innovation and economic development.   Bibliography Entry Siddiqa, Arhama, and Syed Qandil Abbas. 2022. "A New Facet to US-China Rivalry: Build Back Better World versus Belt and Road Initiative." Margalla Papers 26 (2): 1-13

SmallClient for big data: an indexing framework towards fast data retrieval

Numerous applications are continuously generating massive amount of data and it has become critical to extract useful information while maintaining acceptable computing performance. The objective of this work is to design an indexing framework which minimizes indexing overhead and improves query execution and data search performance with optimum aggregation of computing performance. We propose Small-Client, an indexing framework to speed up query execution. SmallClient has three modules: block creation, index creation and query execution. Block creation module supports improving data retrieval performance with minimum data uploading overhead. Index creation module allows maximum indexes on a dataset to increase index hit ratio with minimized indexing overhead. Finally, query execution module offers incoming queries to utilize these indexes. The evaluation shows that Small-Client outperforms Hadoop full scan with more than 90% search performance. Meanwhile, indexing overhead of SmallClient is reduced to approximately 50% and 80% for index size and indexing time respectively