by Khatib Zada Farhan  , Ayman Sabry Shihata  and Adams Balade Abubakar

Received: 27 March 2024;  Published: 22 July 2024;  doi: 10.21926/rpm.2403017

Over the past decade, developing geopolymer mixes to replace ordinary Portland Cement (OPC) composites has yielded positive results, leading to extensive research. The incorporation of fibers in geopolymers, besides impacting the mechanical properties, has also significantly impacted durability, mainly when dealing with the most pernicious forms of deterioration resulting from chloride attack, water penetration, sulfate attack, acid attack, as well as freeze-thaw, which occurred through chemical transgression. This [...]

by Amos O. Oyatogun  , Emmanuel Ajenifuja  , Abimbola P. Popoola  , Olawale Popoola  , Fatai O. Aramide  and Grace M. Oyatogun

Received: 28 December 2023;  Published: 01 July 2024;  doi: 10.21926/rpm.2403016

High strength and good conductivity are both critical parameters for copper-based alloys for electrical and other technological applications. This study is aimed to produce copper alloys and metal matrix composites (MMCs) with enhanced physical properties. Cu-Ti-Ni ternary alloys and MMCs samples were sintered at 600 to 700°C using spark plasma sintering (SPS), with a heating rate of 100°C/minutes, uniaxial pressure of 50 MPa, and a holding time of 10 minutes. Scanning electron microscopy (FE-SEM) was used to exami [...]

by Zhong Hu  and Ruanbao Zhou

Received: 15 March 2024;  Published: 27 June 2024;  doi: 10.21926/rpm.2402015

Biodegradable plastics/polymers may serve as a promising solution to the global problem of plastic waste accumulation in oceans and soil and may significantly reduce carbon emissions from the manufacturing process, since the materials used to make biodegradable polymers are carbon-based and emitted during the synthesis processes. This article systematically reviewed the existing and closely related scientific literature on materials, biomaterials, and biodegradable materials to find answers on how to effectively st [...]

by Mikhail Batanov-Gaukhman

Received: 10 November 2023;  Published: 26 June 2024;  doi: 10.21926/rpm.2402014

The article aims to develop the stochastic interpretation of quantum mechanics by E. Nelson based on balancing the intra-systemic contradiction (i.e., antisymmetry) between “order” and “chaos”. For the set task, it is proposed to combine two mutually opposite system-forming principles: “the principle of least action” and “the principle of maximum entropy” into one, the “principle of averaged efficiency extremum”. In a detailed consideration of the averaged states of a chaotically wandering particle, the time-indepe [...]

by Mohammed Mustafa  , Salman Pervaiz  and Ibrahim Deiab

Received: 23 February 2024;  Published: 18 June 2024;  doi: 10.21926/rpm.2402013

This paper investigates the effect of rake angle, α, cutting edge radius, r, and feed rate, f, on the cutting force and cutting zone temperature during orthogonal dry cutting of Ti6Al4V. A numerical model representative of the 2D orthogonal cutting process is developed using ABAQUS/Explicit software. Johnson-Cook, (JC) constitutive material model is used to describe material plasticity. JC damage model and energy-based fracture criterion are used to describe damage initiation and evolution. Using Minitab-19 softwar [...]

by Paul O'Hara

Received: 20 December 2023;  Published: 03 June 2024;  doi: 10.21926/rpm.2402012

The spin-statistics theorem is generalized to include quantum entanglement. Specifically, within the context of spin entanglement, we prove that isotropically spin-correlated (ISC) states must occur in pairs. This pairing process can be composed of parallel or anti-parallel states. Consequently, the article proposes using ISC states as a unifying principle to explain better Bose-Einstein condensates, the theory of superconductivity, and molecular and atomic orbitals, all of which involve a pairing process. The theo [...]

by Kianoush Hatami Dehnou  and Mohammad Jafar Hadianfard

Received: 14 December 2023;  Published: 03 May 2024;  doi: 10.21926/rpm.2402011

The use of silicone rubber as an implant is limited due to its weak properties. In this study, the impact of various reinforcements, such as TiO2 or SiO2 nanoparticles, carbon, or polypropylene fiber micro reinforcements, on the mechanical, thermal, and viscoelastic properties of silicone rubber composites with RTV-4125 matrix was investigated. The composites were evaluated through several tests, including tensile, compression, FTIR, TGA, DMTA, and water adsorption tests. It was found that the composites' tensi [...]

by Zongqi Guo  and Wenxu Wei

Received: 12 January 2024;  Published: 12 April 2024;  doi: 10.21926/rpm.2402010

Ceramic bonds are conventionally formed during the burning of refractory bricks and by using pre-fabricated blocks or monolithic lining, which is characterized as the coalescence of the particles by liquid sintering. However, the whisker bond was discovered with the outstanding performance of unburnt periclase–spinel–Al bricks while substituting magnesia–chrome bricks in the chromium-free campaign of refractory lining of RH degassers. Thanks to the prominent effect of the whisker bond, such a refr [...]

by Xinran Lv  , Ziqiang Yin  , Zhigang Yang  , Junshuai Chen  , Shen Zhang  , Shaolei Song  and Gang Yu

Received: 02 January 2024;  Published: 03 April 2024;  doi: 10.21926/rpm.2402009

Titanium diboride (TiB2) materials have garnered significant attention due to their remarkable comprehensive properties. They offer potential applications in high-temperature structural materials, cutting tools, armor, electrodes for metal smelting, and wear-resistant parts. However, due to the low self-diffusion coefficient, the TiB2 exhibits poor sinterability, excessive grain growth at elevated temperatures, and inadequate oxidation resistance, limiting its wide application. Therefore, many research works are de [...]

by Alhayat Getu Temesgen  , Ömer Fırat Turşucular  and Elif Dicle Turşucular

Received: 12 December 2023;  Published: 15 March 2024;  doi: 10.21926/rpm.2401008

This mini-compilation study included the chemical structure, mechanical, thermal, and dimensional properties of silk fiber, its production process, pre-treatment, and biomedical applications from various experimental studies, which are compiled and summarized. The silk fiber should have a degumming process before using biomedical applications. The 25% concentration for Na2CO3 in ethanol solution (80%) as a coagulant chemical with a salt such as LiB2 (9 M) at a temperature of 98°C for 45 minutes at pH between 6 [...]