On the Activation Energy of Termination in Radical Polymerization, as Studied at Low Conversion.

The chain-length-dependent nature of the termination reaction in radical polymerization (RP) renders the overall termination rate coefficient, <>, a complex parameter in the usual situation where the radical chain-length distribution is non-uniform. This applies also for the activation energy of termination, (<>), which we subject to detailed mechanistic investigation for the first time. The experimental side of this work measures (<>) for the dilute-solution, low-conversion, chemically initiated homopolymerization of styrene (ST), methyl methacrylate (MMA), butyl methacrylate, and dodecyl methacrylate.

Advantages of CoS nano-particles on the corrosion resistance and adhesiveness of epoxy coatings.

Researchers face significant challenges because of the inadequate corrosion resistance and weak adherence of epoxy (EP) coatings. We deal with these issues here by means of a novel nano-composite coating (EP/nano-CoS). In order to create a composite coating (EP/nano-CoS), CoS nanoparticles (nano-CoS) were prepared and incorporated to an epoxy (EP) resin.

Synthesis, surface activity, and corrosion inhibition capabilities of new non-ionic gemini surfactants.

Several environmentally acceptable non-ionic gemini surfactants are synthesized in this work using natural sources, including polyethenoxy di-dodecanoate (GSC12), polyethenoxy di-hexadecanoate (GSC16), and polyethenoxy di-octadecenoate (GSC18). The produced surfactants are confirmed by spectrum studies using FT-IR, HNMR, and CNMR. It explored and examined how the length of the hydrocarbon chain affected essential properties like foaming and emulsifying abilities.

Recent developments, advances and strategies in heterogeneous photocatalysts for water splitting.

Photocatalytic water splitting (PWS) is an up-and-coming technology for generating sustainable fuel using light energy. Significant progress has been made in the developing of PWS innovations over recent years. In addition to various water-splitting (WS) systems, the focus has primarily been on one- and two-steps-excitation WS systems.

Impact of CoO nanoparticles on epoxy's mechanical and corrosion-resistance properties for carbon steel in seawater.

CoO nanoparticles (CoO-NPs) are synthesized using the facile solvothermal method. FT-IR and XRD spectroscopic analyses verify the creation of cobalt oxide nanoparticles with an average size of 13.20 nm.

Impact of some inorganic anions on the corrosion of nickel in a solution containing NaSO and NaClO.

Potentiodynamic study was carried out on nickel in NaSO solution in the presence of ClO, WO, MoO, NO and NO ions. The anodic excursion spans of the metal nickel in a solution of NaSO are marked by the appearance of clearly defined anodic peak, passive region, and transpassive shoulder. According to the data, the anodic peak current density (I) rise from 1.

Prevalence of Internet Gaming Disorder Among Intermediate and High School Students in Albaha, Saudi Arabia: A Cross-Sectional Study.

Background and Objectives Excessive video game use, particularly among young people, is a growing problem that poses potential serious mental health risks in many parts of the world. However, there is a lack of research on the prevalence of internet gaming disorder (IGD) in Saudi Arabia, particularly in Albaha region. The objective of this study was to determine the prevalence of IGD among a sample of intermediate and high school students in Albaha and to identify potential factors associated with the development of the disorder.

Synthesis and evaluation of N-allylthiourea-modified chitosan for adsorptive removal of arsenazo III dye from aqueous solutions.

N-allylthiourea chitosan (ATUCS), a chelating material, was prepared, characterized, and studied for the removal of arsenazo III (As (III)) dye from aqueous solution. Scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and H- and C-nuclear magnetic resonance (NMR) were used to characterize the prepared adsorbent and to investigate the adsorption mechanism. Furthermore, the adsorption behavior of chitosan (CS) and ATUCS were studied under various conditions.

Hepatitis C virus infection in Jeddah city, Saudi Arabia: Seroprevalence and knowledge.

The infection rate of the hepatitis C virus (HCV) in Saudi Arabia is among the lowest in the world. However, it is likely that poor knowledge and awareness of HCV infection could minimize the effectiveness of prevention and control programs in the kingdom. Thus, the study objective was to estimate the prevalence of HCV infection, and to assess current knowledge about it, in the targeted population.

Prevalence and predictors of hepatitis B in Jeddah City, Saudi Arabia: a population-based seroprevalence study.

Introduction: Despite solid preventive strategies to reduce the risk of hepatitis B virus (HBV) infection, recent reports about its prevalence and predictors are lacking in several Saudi cities at the community level. This study aimed to assess the seroprevalence of HBV and to identify the most important predictors among the Saudi population in Jeddah city, Saudi Arabia.

Methodology: A cross-sectional study was conducted among 5,584 Saudi people attending primary health-care centers in Jeddah city during 2012/2013.