R Research Papers

Physics of neutrinos and applications to astrophysics

Astrophysics with Intense and Ultra-Intense Lasers “Laser Astrophysics”

I review the present status of laser astrophysics research in which the intense and ultra-intense lasers are used to study basic data of hot-dense plasmas, violent phenomena such as explosion scaled down in laboratory with appropriate simil...

Lectures on Astrophysics

Lectures on Astrophysics provides an account of classic and contemporary aspects of astrophysics, with an emphasis on analytic calculations and physical understanding. It introduces fundamental topics in astrophysics, including the properti...

Advances in astronomy and astrophysics

Atomic Astrophysics and Spectroscopy

Spectroscopy enables the precise study of astronomical objects and phenomena. Bridging the gap between physics and astronomy, this is the first integrated graduate-level textbook on atomic astrophysics. It covers the basics of atomic physic...

Erratum to: Scattering and bound states for the Hulthén potential in a cosmic string background

Identification of periodic density structures in Solar Orbiter data: Helical structures and flux ropes

Context. Quasi-periodic density structures (PDSs) are quasiperiodic variations in the solar wind density that range from a few minutes to a few hours. They are trains of advected density structures with radial length scales LR ≈ 100 − 10 00...

Eclipsing Millisecond Pulsars with He Star Companions

Eclipsing millisecond pulsars (MSPs) are a type of pulsar binaries with close orbits (≲1.0 day). They are important objects for studying the accretion history of neutron stars (NSs), pulsar winds, and the origin of isolated MSPs, etc. Recen...

Discrete Versions of Jensen–Fisher, Fisher and Bayes–Fisher Information Measures of Finite Mixture Distributions

In this work, we first consider the discrete version of Fisher information measure and then propose Jensen–Fisher information, to develop some associated results. Next, we consider Fisher information and Bayes–Fisher information measures fo...

Inference, Prediction, & Entropy-Rate Estimation of Continuous-Time, Discrete-Event Processes

Inferring models, predicting the future, and estimating the entropy rate of discrete-time, discrete-event processes is well-worn ground. However, a much broader class of discrete-event processes operates in continuous-time. Here, we provide...

SN 2023ixf in M101: Physical Parameters from Bolometric Light Curve Modeling

We present new photometric observations of the core-collapse supernova SN 2023ixf occurred in M101, taken with the RC 80 and BRC80 robotic telescopes in Hungary. The initial nickel mass from the late-phase bolometric light curve extending u...

To Study the Relationship between Intellectual Capital and Productivity in Iran Productive Industries

Successful companies have realized that investment on intellectual capital to create valuable products and services is essential. Moreover, in unsafe situations for new investment, enterprise has no choice except optimal use of available re...

Risk Analysis of Supply Chain Finance under Blockchain Technology - Based on AHP-FCM Model

Applying blockchain technology to supply chain finance is the only way for the in-depth development of supply chain finance. However, increasingly prominent risk issues restrict the stable development of blockchain finance, so it is necessa...

Drivers of municipal waste generation in Nordic countries: panel evidence

Municipal waste generation remains a persistent sustainability challenge, even in countries with strong environmental governance and circular economy ambitions. Yet it remains unclear how affluence, household final consumption expenditure a...

Best practice relief supply for emergency services in a developed economy

Purpose – The purpose of this paper is to discuss the challenges inherent in planning and responding to disaster events in a multi-agency context where numerous governmental and non-governmental actors and agencies are involved in the plann...

Determinants of Financial Literacy and Investment Behavior: Evidence from University Students

The research explores Financial Literacy (FL) among undergraduate students. The study aims to evaluate the FL of a specific group of undergraduate students. It investigates how different demographic and socioeconomic factors influence these...

Machine learning-based dynamic risk measurement for white sugar futures under geopolitical risks

Futures, as significant financial derivatives, play a crucial role in financial markets by fulfilling price discovery functions and providing efficient risk hedging tools. Against the backdrop of geopolitical conflicts, market risk emerges ...

بررسی تأثیر فرضیه سیاسی بر سیاست‏ های تأمین مالی شرکت‏های پذیرفته‏‏ شده در بورس اوراق بهادار تهران

در پژوهش حاضر، اثر فرضیه سیاسی بر سیاست‌های تأمین مالی موردبررسی قرار گرفت. به‌منظور آزمون فرضیه‌های پژوهش، داده‌های مربوط به 123 شرکت پذیرفته‌شده در بورس اوراق بهادار تهران طی سال‌های 1390 الی 1398 موردبررسی قرار گرفت. متغیرهای ریسک، تراکم...

Geographic patterns and dimensions of poverty in the Indian Himalayan region

Despite India's progress in reducing national poverty rates, pockets of severe poverty persist in the mountainous states comprising the Indian Himalayan Region (IHR). This paper examines the geographic patterns and dynamics of consumption a...

THE BASIC ASPECTS OF APPLICATION OF INFORMATIONCOMMUNICATION TECHNOLOGIES IN A SMALL-SCALE BUSINESS AND PRIVATE BUSINESS IN REPUBLIC UZBEKISTAN

Development of a small-scale businessand private business in Uzbekistan inthe conditions of formation of innovative economy is impossible without effective application of the advanced information-communication technologies which givepossibi...