Polyvinylpyrrolidone (PVP; poly(N-vinylpyrrolidone)) is a versatile water-soluble polymer widely used in pharmaceuticals, coatings, and nanocomposites due to its solubility, biocompatibility, and film-forming properties. Despite its extensive applications, systematic kinetic data describing its thermal degradation remain limited. In this study, non-isothermal thermogravimetric analysis (TGA) of PVP was performed under nitrogen and air atmospheres at heating rates of 5, 10, 20, and 40 °C min⁻¹. Thermal profiles revealed three degradation stages: moisture loss (30–150 °C), main-chain scission and depolymerization (150–450 °C), and carbonaceous residue formation (>450 °C), with the principal decomposition peak at 370–410 °C. Activation energies (Eₐ) determined using Kissinger, Flynn–Wall–Ozawa (FWO), and Kissinger–Akahira–Sunose (KAS) methods ranged from 179 to 186 kJ mol⁻¹ and were validated using the Coats–Redfern model-fitting approach. Reaction orders (n ≈ 1.1–1.3) indicate random chain scission as the dominant mechanism. The resulting kinetic dataset provides reliable insight into PVP thermal stability and supports optimization of processing, recycling, and composite fabrication.

This paper presents a comprehensive analysis of load expansion planning through the integration of photovoltaic systems at the Bir Alganame 220/30 kV substation. An electrical planning system serves as a crucial tool for designing electrical systems that effectively meet evolving energy demands. The study investigates the impact of load expansion on hybrid photovoltaic system design, focusing on system reliability and total project cost as primary design objectives. The research methodology encompasses a detailed load flow study conducted in 2024, coupled with load forecasting for 5 and 10-year horizons at an 8% load increase rate. The investigation includes analyzing the optimal parameters of the PV system integration with the existing grid to ensure proper functionality. Additionally, the study addresses the probabilistic scenario set of load demand and natural characteristics of renewable energy, which is crucial for power system planning studies. The research emphasizes the importance of proper transmission system network development to reliably and securely evacuate the generated power to meet future domestic load demand. Through simulation and analysis, this study demonstrates an integrated approach to improving power system performance while considering geographical and environmental factors affecting PV output. The findings provide valuable insights into optimal electrical network planning procedures, incorporating both long and short-term perspectives through PV system integration.

Polyvinylpyrrolidone (PVP) is a widely used water-soluble polymer with applications in pharmaceuticals, cosmetics, adhesives, and medical devices. Despite its versatility, the thermal stability of PVP remains a concern during processing and high-temperature applications, where degradation can compromise performance and safety. This study aimed to investigate the kinetic parameters of PVP thermal degradation using isothermal thermogravimetric analysis (TGA) over a temperature range of 30–800 °C. PVP samples were analyzed under a nitrogen atmosphere, and weight loss was recorded over time. Kinetic parameters, including activation energy (Ea) and pre-exponential factor (A), were determined, and molecular weight changes were evaluated via gel permeation chromatography. Results indicated multi-stage degradation with increasing Ea at higher temperatures, consistent with backbone scission and pyrrolidone ring decomposition. Molecular weight decreased progressively, and polydispersity increased, reflecting chain fragmentation. The study provides accurate isothermal kinetic data, contributing to better prediction of PVP behavior under thermal stress and guiding the design of thermally stable formulations

Abstract:

This study assesses the implementation level of the Occupational Health and Safety Management System (OHSMS) based on ISO 45001:2018 at Brega Oil Marketing Company (BOMC), Libya. A quantitative descriptive methodology was employed using a structured questionnaire derived from ISO 45001 clauses. Data were collected from 60 employees across four operational sites and analyzed using descriptive statistics in IBM SPSS. The results indicate partial compliance with ISO 45001 requirements (mean ≈ 3.82). Strong performance was observed in safety awareness and employee satisfaction, whereas weaknesses were identified in planning, hazard identification, and performance evaluation processes. The study recommends strengthening risk-based planning and internal auditing mechanisms to improve system effectiveness and ensure continual improvement.

Keywords: Occupational Health and Safety, ISO 45001, Gap Analysis, Oil and Gas Industry, Brega Oil Marketing Company. 

Abstract

Developing reading proficiency is essential for mastering English as a Foreign Language (EFL), yet many learners encounter difficulties due to restricted vocabulary and a lack of contextual understanding. To mitigate these issues, educators often suggest using picture books, which integrate visual imagery with text to help students decode meaning through multiple channels.

This study examines the influence of illustrated books on EFL reading comprehension using a quasi-experimental framework. The research involved 30 primary school pupils, divided into an experimental group using picture books and a control group receiving standard instruction. Results from pre- and post-test evaluations showed that students in the experimental group made significantly more progress than those in the control group.

These outcomes suggest that picture books are a powerful resource for enhancing comprehension and learner interest. Based on these findings, this study recommends EFL teachers incorporate  illustrated materials into their lessons  to enhance students’ understanding and engagement.

Keywords: picture books, reading comprehension, EFL learners, visual learning, young learners, language teaching.