Metals - Science topic

Metallic structures, introduced by V. de Spinadel in 2002, opened a new avenue in differential geometry. Building upon this concept, C. E. Hreţcanu and M. Crasmareanu laid the foundation for metallic Riemannian manifolds in 2013. The field's rich potential and diverse applications have since attracted significant research efforts, leading to a weal...

Master 2 internship in nanophotonic. Experimental work in nanoantena for light emission.

In this study, we aim to investigate the influence of fiber dosage and distribution on the flexural strength of self-compacting concrete. Two types of fibers were employed as reinforcement in self-compacting concrete: Dramix 3D hooked metallic fibers and polypropylene fibers with identical geometric characteristics to the metallic ones. The studied...

The enzyme carbonic anhydrase has been intensely studied over decades as a means to understand the role of zinc in hydrating CO2. The naturally occuring enzyme has also been immobilized...

Madenlerin aranması, çıkarılması, hazırlanması, zenginleştirilmesi, depolanması sonucunda oluşan katı ve sulu çamur şeklinde olabilen maddeye ya da malzemeye MADEN ATIĞI denir. Cevherleşme içermeyen ya da mevcut ekonomik ve teknik şartlara göre zenginleştirilmesi mümkün olmayan, ancak işletme gereği üretilmesi zorunlu olan ve kazı işlemi dışında he...

Objetivo: El objetivo de este estudio fue analizar la gestión de residuos sólidos domiciliarios del recinto Guapara, cantón Pangua, Ecuador. Marco Teórico: En este tema se presentan los principales conceptos y teorías que sustentan la investigación. La gestión de residuos sólidos domiciliarios destaca, proporcionando una base sólida para comprender...

We analyze the dynamical pairing susceptibility $\chi_{pp} (\omega_m)$ at $T=0$ in a quantum-critical metal, where superconductivity emerges out of a non-Fermi liquid ground state once the pairing interaction exceeds a certain threshold. We obtain $\chi_{pp} (\omega_m)$ as the ratio of the fully dressed dynamical pairing vertex $\Phi (\omega_m)$ an...

The report presents traceability of the rare earth elements from Nordic deposits. It also deals with their sustainability and social license to operate issues. https://www.nordicinnovation.org/2024/mineral-metal-traceability

La Tierra posee recursos minerales como cobre, plomo, plata, zinc en forma de metales y metaloides transformables por la minería (Windish et al., 2022). La presencia de sulfuros en estos procesos mineros, en forma de arsenopirita (FeAsS), esfalerita (ZnS) y otros sulfuros de hierro (FexSx) contribuyen a la formación de drenaje ácido de mina que con...

Bottom-up nano- to micro-fabrication is crucial in modern electronics and optics. Conventional multi-scale array fabrication techniques, however, are facing challenges in reconciling the contradiction between pursuit of better device performance...

An efficient and convenient strategy has been successfully developed for the preparation of novel hydroxylated alkaloid derivatives (also called fused multicyclic iminosugars) from p-toluenesulfonylated sugars through a Pictet–Spengler-type mechanism. This method is highly stereoselective, does not require metal catalysts, and capable of conducting...

O presente artigo tem como objetivo analisar o trabalho da banda brasileira Gangrena Gasosa, centrando-se em um recorte de seu albúm Gente Ruim Só Manda Lembrança Pra Quem Não Presta, de 2018, buscando percebê-lo como resultado de um hibridismo cultural, a partir do qual pedagogias passam a emergir. Parte-se do campo dos Estudos Culturais, com insp...

The influence of stress relaxation on ductility improvement has been extensively studied for metallic materials , primarily through interrupted uniaxial tensile tests. However, components in typical press forming processes are subjected to multiaxial states of stresses. The applied load paths are expected to have a bearing on the failure strain pos...

The Hoggar region is known as a rare metals’ province, where Nb, Ta, Sn, W, Li and Be mineralizations are mainly related to post Pan-African granitoid complexes and are either linked to related magmatic systems or resulted from associated hydrothermal activity. Despite the numerous rare metals’ occurrences, only limited granites have been classif...

Las personas han estado generando grandes cantidades de residuos que son desechados en diferentes lugares, conteniendo material orgánico como los de origen doméstico, pero también material inorgánico como metal, vidrio, medicamentos entre otros (Richard et al., 2021). Entre estos materiales, se encuentra el plástico que es muy utilizado, ya que est...

The analysis of the stress-strain state of a thin-walled metal ring under the influence of concentrated constant forces is carried out in the article. The degree of equivalent and shear stresses of the ring material at the initial moment and after 1 s of application of the load on the outer surface is investigated.

Carbon nanotubes (CNTs) grow with a controlled diameter via the ‘seed method’ in which in situ -prepared nanoparticles, using metal clusters as seeds, catalytically decompose syngas and realize CNT growth.

I review the formalism of patch bosonization of Fermi surfaces, with a focus on the problem of a two-dimensional metal at a quantum critical point. I argue that this formalism is fundamentally inapplicable to the problem, except in synthetic limits. One such limit is the small-$N$ limit, which was already discussed in early studies of the problem;...

This study focuses on assessing the levels of copper and silver in teeth samples obtained from adults residing in Najaf Governorate, Iraq. By analyzing the concentration of these metals in teeth tissues, researchers aim to gain insights into potential health implications and environmental exposure sources. The investigation seeks to understand the...

First-principle calculations have been performed on the Nd-based pyrochlore iridate, Nd\(_{2}\)Ir\(_{2}\)O\(_{7}\) , to investigate electronic structures and magnetic properties. The generalized gradient approximation formalism, GGA, has been used to correct the string onsite Coulomb repulsion energy (U) between localized 5d and 4f electrons. Our p...

Bu çalışma, Türkiye'nin en yüksek radyoaktivite temel değerlerinden (background) birine sahip Gümüşhane bölgesinde, özellikle Torul ve çevresinde yüzeylenen granitik kayaçların radyoaktif element konsantrasyonlarını ve potansiyel sağlık risklerini değerlendirmeyi amaçlamaktadır. Torul plütonuna ait 40 K, 232 Th ve 238 U elementlerinin radyoaktivite...

RESUMEN: El proyecto se centra en el uso del tornillo de Arquímedes para generar energía renovable, específicamente para cargar dispositivos móviles en áreas rurales con acceso limitado a electricidad, como el sector de Las Tetonas en Ráquira, Boyacá. La tecnología aprovecha fuentes de agua de bajo caudal y altura, convirtiendo energía potencial en...

The use of reduced-scale physical models is highly valuable, as it is based on the theory of similarity. These models have become an important factor in evaluating different roofing materials for intensive animal farming. In light of this, this study aims to evaluate the thermal performance of different types of roofing, with various roof modificat...

Simple divalent metal benzoxides are reported as robust and efficient catalysts for lactide (LA) polymerisation. Following a “pre-stir” step to aid solubility, the best performing catalyst, Zn(OBn)2, gave quantitative monomer conversion in just 30 seconds and performed well under industrially relevant settings with high monomer loadings, bulk polym...

This paper explores the results of metallographic analysis of bimetallic materials formed by explosive welding and diffusion welding. The materials are made of VT1-0 and AlMg6, as well as 08Cr18Ni10Ti and AlMg6. The study focuses on the structure and phase composition of specific areas of melted metal in these materials. It was found that during di...

Patlayıcı maddeler, askeri amaçlarla ve sivil mühendislik uygulamalarında yaygın olarak kullanılmaktadır. Birincil patlayıcılar, daha az duyarlı ikincil patlayıcıları ateşleyebilmek için fünye ya da primer karışımlarında kullanılan ve alev, darbe, elektrik kıvılcımı, sürtünme ya da ısı gibi küçük bir etkiyle bir patlama dalgası oluşturabilen patlay...

The effect of para-substituents on the NC bond of aryl isocyanide molecules adsorbed on Au, Ag, Pt, and Pd surfaces was examined by vibrational sum frequency generation (VSFG) spectroscopy. The frequency of NC stretching vibration, υNC, depended on the electronic property of the substituents. When the substituents were more electron-withdrawing and...

After a very successful initial debut, this second edition of a Special Issue of Metals has been commissioned that is specifically devoted to aspects of mineral processing and hydrometallurgy. Again, the editors are Prof. Dr. Corby Anderson and Dr. Hao Cui. This is a unique, focused Special Issue, as the specific combination of hydrometallurgy and...

Newly discovered prehistoric metal objects from northwestern Wallachia

This paper presents detailed experimental findings on magnetoresistance, characterized by the change in electrical resistance of a material when subjected to an external magnetic field. The experiment focused on measuring the magnetoresistance of a metallic sample across varying magnetic field strengths and temperatures. The results reveal signific...

Metal connectors are important load-bearing components in precast concrete insulated sandwich wall panels, and their tensile capacity need to be determined through testing. Due to the variety of connector styles and different anchoring structures, this article focuses on the commonly used single-pull and double-pull test methods, using typical spec...

An Erratum to this paper has been published: https://doi.org/10.1134/S0016702924190030

The following project aims to analyse and evaluate the differences between welding seams obtained by the process of Manual Arc Welding (SMAW) and Arc Welding with Metal Gas (GMAW), where aspects such as quality will be investigated, Efficiency, cost and applicability in various industries.

It explains various analysis techniques for rubber compositions such as polymers, fillers, chemicals, and ashes (metal oxides).

Background: The profile of metal (loid)s in human milk is essential for infant growth and development, yet its impact on the development of the infant microbiota remains unclear. Elements such...

Les psychothérapies occidentales ne peuvent apporter une aide réelle aux patients musulmans pour un certain nombre de raisons, que nous allons énumérer d’abord de manière générale puis en détails. En premier lieu, lorsqu'il s'agit de soigner des individus dans un contexte transculturel, la psychologie ne peut pas être comparée aux sciences exactes....

Цель. Разработка рецептурного состава металлофосфатных огнезамедлительных систем (ОЗС) в виде устойчивых коллоидосодержащих растворов и исследование влияния модифицирующих добавок на устойчивость огнезащитной отделки полиэфирных тканей к гидролизной обработке (стирке). Методы. Золь-гель метод синтеза металлофосфатных ОЗС, лабораторные и стандартные...

The serious mismatch between the positive and negative electrodes of supercapacitors (SCs) makes it imperative to develop high‐performance negative electrode materials. Among them, multimetallic iron‐based oxides (MIBOs) are intensively investigated attributed to their high theoretical specific capacitance, wide operating potential window, copious...

O conteúdo de oxirredução envolve reações biológicas e com metais, fundamentais para a sociedade contemporânea. Devido a isso, os documentos curriculares brasileiros têm definido competências e habilidades associadas ao conteúdo a serem desenvolvidas na educação básica. Além disso, a literatura sobre o ensino da oxirredução explica que existem quat...

This review focuses on the state-of-the-art of organic light-emitting diodes (OLEDs) and light-emitting electrochemical cells (LECs) prepared with transition metal complexes featuring thermally activated delayed fluorescence (TADF) mechanism.

1. The properties of the coatings produced through the immersion deposition method. 2. The impact of time and additives on the quantity of metal deposited in the immersion deposition process.

Performance of functional nanocatalysts can be extended by integrating multiple types of metals into well-designed nanoparticles. A porous multimetallic shell grown around high-quality monometallic seeds significantly enhances the available active...

Industri maritim ditunjang oleh keberadaan galangan kapal sehingga teknologi pengelasan Flux Core Arc Wellding (FCAW) digunakan dalam pembangunan kapal pembangkit listrik terapung. Tujuan dari penelitian ini adalah mengetahui dampak dari variasi ampere pada hasil pengelasan FCAW material Grade EH36 tebal 24 mm dengan material Grade A tebal 16 mm po...

Metallic gratings can be used as infrared filters, but their performance is often limited by bandwidth restrictions due to metallic losses. In this work, we propose a metallic groove–slit–groove (GSG) structure that overcomes these limitations by exhibiting a large bandwidth, angularly independent, extraordinary optical transmission. Our design ach...

Retention of metal ions onto PET microplastic fibres is expected during sewage treatment.

Exploration of a novel interaction structure for a TE0,1-mode gyro-travelling-wave-tube (gyro-TWT) was presented in the paper. This interaction structure features both the azimuthal and axial periodicities. The interaction structure was presented, modeled, simulated and analyzed to study it's dispersion characteristics. The dimensional parameters w...

A ruthenium(II)‐catalyzed C−H acylmethylation of Trp‐containing peptides with α‐chloro ketones is reported here. This reaction features good C‐2 selectivity and chemoselectivity, making it suitable for late‐stage modification of Trp‐containing peptides. Low‐cost metal ruthenium as a catalyst enables the reaction to be conducted on a gram scale. Thi...

Some metal surgical tools from Antalya Museum

Solid metal oxides are widely recognized for their ubiquitous presence and multifaceted utility in everyday applications [...]

Σκοπός της παρούσας έρευνας ήταν ο σχεδιασμός, η ανάπτυξη και η αξιολόγηση πειραματικών δραστηριοτήτων για τη διάδοση της θερμότητας με αγωγή στα μέταλλα για μαθητές Ε’ τάξης. Απώτερος στόχος ήταν η καταγραφή των μονοπατιών μάθησης των μαθητών σε αυτή τη θεματική περιοχή. Οι δραστηριότητες εφαρμόστηκαν με τη μέθοδο του διδακτικού πειράματος σε 12 μ...

Ni extraction from laterite ore has progressively intensified via various hydrometallurgical methods. One of the by-products of the leaching process is Mn, which can increase the resilience of this metal supply on the market. By observing the effects of the laterite roasting temperature and the effects of the Mn leaching temperature and duration, w...

We examine the onset of Anderson localization in three-dimensional systems with structural disorder in the form of lattice irregularities and in the absence of any on-site disordered potential. Analyzing two models with distinct types of lattice regularities, we show that the Anderson localization transition occurs when the strength of the structur...

Məqalədə Azərbaycanın bentonit gil yataqlarından mümkün qədər istifadə sahələri o, cümlədən metallurgiya, neft-qaz, neft emalı, kimya, qida, kənd təsərrüfatı və s. araşdırılmışdır. Azərbaycanda neft sənayesinin inkişafı və tətbiq sahələrinin genişlənməsi prosesində bentonit gilinin fiziki-kimyəvi xassələrinin öyrənilməsinə maraq xeyli artmışdır. Bu...