MATERIA-RIO DE JANEIRO

Ramiro Cesar Padovani Lozorio, Alexandre Vianna Bahiense, Viviana Possamai Della Sagrillo, Carlos Eduardo Gomes Ribeiro et al.

ABSTRACT This study evaluated the influence of mix proportion and water/cement ratio on the mechanical and thermal performance of cement rendering mortars incorporating fines from ornamental stone processing (Fibro) as partial replacement of natural sand. A full 32 factorial design was adopted using three mix proportions (1:1:5, 1:1:6, and 1:1:7—cement:Fibro by mass) and three …

Viviana Patricia Ramunni, María Inés Pascuet, Julián Roberto Fernández

ABSTRACT In this work, we investigate the equilibrium atomic structure of the Cu/Ta interface in the Ta–Cu system, focusing on the Nishiyama–Wasserman orientation relationship, by means of atomistic simulations employing angular-dependent potentials (ADP). Two distinct lattice-mismatch regions, denoted as ZI and ZII, are identified at the interface. The static properties of vac…

Dharmaraj Rajalinggam, Sri Aiswarya Devadass, Saravanan Ramasamy, Karuppasamy Narayanan

ABSTRACT Concrete is brittle substance whose tensile strength and flexural strength are low and may easily crack and its lifespan is limited. The proposed research aims at assessing how the addition of nylon fiber affects the mechanical and workability of M30 grade reinforced cement concrete (RCC). The originality of this study is that the nylon fibers used are used at optimal …

Kalluru Lakshmi Prasad Reddy, Mallapu Vijaya Kumar

ABSTRACT Ultra-fast electric vehicle (EV) charging stations operating at power levels above 350 kW introduce critical challenges related to grid peak demand, high operating cost, renewable intermittency, and battery stress. This paper presents a machine learning-enabled energy management system for a hybrid renewable-powered ultra-fast charging station integrating photovoltaic …

Alexandro Itzal Medina Velázquez, Antonieta García Murillo, Viridiana Hernández Herrera, Felipe de Jesús Carrillo Romo et al.

ABSTRACT This work presents an automated methodology for identifying inorganic compounds from powder X-ray diffraction (XRD) patterns using convolutional neural networks (CNNs). Crystallographic information files (CIFs) were automatically retrieved from the Crystallography Open Database (COD) and processed to generate theoretical diffractograms, including peak positions and int…

Qi Meng, Xingyu Wen, Kun Li, He Jiang et al.

ABSTRACT Considering the chloride permeability and mechanical characteristics of cement-based materials in cold marine environment are significantly affected by coupling action of freezing and thawing cycles as well as chloride penetration during early curing phase, a serial of experimental measurements were conducted to study the influence degree of curing age and salt freeze-…

Seenivasan Murugesan, Thirumalai Ramanathan, Venugopal Thangamuthu, Murugan Kuppusamy

ABSTRACT In almost all machining processes there are several constraints associated and the objective functions are in conflict with the another objective function. In these situations, where equal importance is to be given to all constraints, multi criteria decision making is involved to determine the best optimal solution taking into consideration of all the objective functio…

Meng Yu, Guorui Xu, Bo Zhang, Shuyu Song et al.

ABSTRACT To achieve effective in-depth control of injection water for the heterogeneous reservoir of offshore oilfields, a new profile control agent is developed. The co-polymer is prepared by using the cross-linking method with AM and the cross-linker. After the polymer is treated by grinding control technology, the dispersed co-polymer micro-particle gel (DMG) is prepared. Re…

Marcelo Miguel, Gustavo Riveros Godoy, Katya Regina de Freitas Zara, Janine Padilha Botton

ABSTRACT Hydrogen energy has attracted considerable attention and stimulated discussions as a favorable vector for the sustainable energy transition that is increasingly being pursued worldwide. This article presents an analysis of the possible impacts of hydrogen on the energy transition of Brazil and Paraguay. Due to the diversity of possibilities for the use of hydrogen, its…

Galesh Micheal, Ninija Merina Rymond, Jeffy Pravitha Jebason, Subash Narayana Perumal

ABSTRACT Geopolymer concrete is a sustainable substitute for ordinary Portland cement which minimizes carbon dioxide emissions and effectively utilizes the waste from industries. Proper predictive estimating compressive strength can assist in the mix deign optimization, structural reliability. The article presents a machine learning-based framework to predict the compressive st…

Kai Deng, Yuping Zhao, Aimin Chu, Henan Tu et al.

ABSTRACT In this work, a four-step process was developed to fabricate Al2O3-based composites synergistically reinforced with in situ generated ZrO2 and SiCw. First, a homogeneous Al2O3/SiO2/ZrO2+C precursor was prepared by SCS method. Second, the precursor was converted into Al2O3/SiCw/ZrO2 composite powder through carbothermal reduction, water washing, and air calcination. Thi…

Vadakkumannam Ramasamy Sivakumar, Chanakyan Chandrasekaran, Ashok Raj Rajendran, Rajkumar Subburathinam

ABSTRACT Structural applications need light weight with high strength materials to exhibit high performance. In this research, AL8079 is reinforced with titanium di boride (TiB2) in 0, 5, 10, 15 and 20 wt.% by stir casting. The manufactured AL8079 based composites are solution treated and aged for enhancing the mechanical properties of composites. Solution treated and aged and …

Dineshkumar Murugesan, Venkatesan Manickam

ABSTRACT Proposed study examines how sodium chloride (NaCl), magnesium sulphate (MgSO4), and calcium chloride (CaCl2) affect heat retention and energy extraction in a trapezoidal Salt Gradient Solar Pond (SGSP) with sloped walls to reduce sidewall losses and improve gradient stability. Three-layer prototype: upper convective zone (UCZ), non-convective zone (NCZ), and lower conv…

Jingqiong Lu, Jinguo Zhao, Zixuan Li, Hui Wang et al.

ABSTRACT Mixed matrix ultrafiltration membranes based on polyacrylonitrile (PAN) and aminated MIL-125(Ti) (NH₂-MIL-125(Ti)) were fabricated by non-solvent induced phase separation for the treatment of oil-in-water emulsions. NH₂-MIL-125(Ti) nanoparticles with disc-like morphology and high crystallinity were successfully synthesized and incorporated into PAN at loadings of 0.5–5…

Saravanan Paranthaman, Dinesh Subbiah, Ravikumar Sadayan Mottaiyan, Karthick Pannerselvam

ABSTRACT Abrasive waterjet machining (AWJM) is increasingly adopted for precision cutting of high-strength steels; however, accurate prediction of machining responses remains challenging due to complex nonlinear interactions among process parameters. This study aims to develop a reliable data-driven framework for predicting material removal rate (MRR), surface roughness (Ra), a…

Nicole Hansen, Arthur Medeiros, Matheus David Inocente Domingos

ABSTRACT This study evaluated the technical feasibility of incorporation of LSS into base concretes for rigid pavements and focusing on enhanced properties of the concrete. Two approaches were employed here, and two reference mixtures – designated as A-0 and S-0 – were designed. These two approaches are as follows: (a) simple additions of 1% (A-1), 1.5% (A-1.5), and 2% (A-2) of…

Narendran Jagadeesan, Karthikeyan Thangavelu, Sankar Thangavel, Ratchagaraja Dhairiyasamy

ABSTRACT Polyamide tribosystems are used in gears, bushings, bearings, and guide elements, where friction and wear constrain efficiency and durability. Bio-based lubricants are significant in this field because polar fatty acid esters can form boundary films while reducing reliance on petroleum oils. This work evaluates the friction and wear of PA6, PA66, PA66GF30, and PA66MoS2…

María del Rosario González-García, Antonieta García Murillo, Felipe de Jesús Carrillo Romo, Solange Ivette Rivera Manrique et al.

ABSTRACT Eu3+-doped YPO4 ceramic powders (6 mol%) synthesized via a solvothermal approach exhibit a high absolute quantum yield of 62%, highlighting the importance of controlled synthesis conditions for enhanced luminescent performance. Optimized parameters produced highly crystalline, quasi-spherical nanoparticles (~45–50 nm) with low defect density, favoring efficient radiati…

Senthilkumar Ramasamy, Anbarasu Palanisamy, Shanmugapriya Muthusamy, Anitha Rajendran

ABSTRACT In today’s world, renewable energy sources are picked to generate clean energy in the production process, hence giving them a natural efficiency and environment benefits. Although, solar photovoltaic (SPV) is a source of renewable energy that is very attractive, widespread appropriation continues to be hindered by the use of massive land areas. The systems of polycryst…

Luis Vanderlei Torres, Bruna Vilas Bôas, Eugênio José Zoqui

ABSTRACT This work aims to contribute to metal processing in the semisolid state by analyzing the microstructural behavior of the Al4.5Cu5Zn under two production routes: conventional (without a grain-refining alloy) and grain refinement. The alloy was reheated to the working temperature corresponding to a 45% solid fraction (608 °C) and maintained for various heat treatment tim…