Science topic

Composition Studies - Science topic

Composition Studies ("Composition and Rhetoric," "Rhetoric and Composition," "College Composition," "Writing Studies," or simply "Composition") is the professional field of writing research and instruction.
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Publications related to Composition Studies (5,028)
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Despite the presence of body composition studies in Russia, there are no current reviews on this topic, and the results are relatively rarely published abroad. Our aim was to describe the history and current state of this research work, to list unresolved problems, and to outline possible developmental trends. For completeness, in the initial part...
Article
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This present work aimed to evaluate the behavior of microconcretes with diferent types of construction waste (ceramic block, mixed mortar and structural concrete), partial replacers of the fne natural aggregate (FNA), for a condition of constant consistency acquired with aid of a superplasticizer. It was performed not only analysis in macro scale (...
Article
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Objectives To analyze and compare, in vitro, the microhardness, sorption, solubility, color stability, and cytotoxicity of three types of resin composites: self-adhesive (SARC) (Dyad Flow (DF)/Kerr), bulk-fill (Filtek Bulk Fill Flow (FBF)/3 M ESPE), and conventional (Filtek Z350XT Flow (Z350)/3 M ESPE). Materials and methods Thirty cylindrical spe...
Article
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Potassium carbonate (K 2 CO 3) is a promising thermochemical heat storage material (TCM). However, it suffers from hysteresis between (de)hydration temperatures and poor reaction kinetics close to equilibrium conditions. Both aspects are caused by a nucleation barrier and low ionic mobility close to equilibrium. This study investigates the impact o...
Article
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Abstract The world is moving towards clean energy, especially since the Paris Agreement in 2016. Indonesia is no exception, which must reach 23% of its total energy mix usage from renewable energy sources by 2025, as stated in President Regulation No. 22/2017. Biomass as a renewable energy source can be used as a co-firing fuel for power plants ba...
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Improving the operating performance of superhard composites is an important and urgent task, due to a continuing industrial need. In this work, diamond composites with high wear resistance were obtained by sintering fluorinated mixtures of micron-sized diamonds with nanodiamonds at high pressures and temperatures (7–8 GPa, 1550–1700 °C). Aluminum a...
Article
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VOCs emitted by flowers play an important role in plant ecology. In the past few years, the Tillandsia genus has been scarcely studied according to the VOCs emitted by flowers. Hence, we decided to enlarge the VOCs composition study already undergone in our laboratory on fragrant 3 Tillandsia species to 12 unscented and 2 faint-scented Tillandsia s...
Article
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The present research explores the fabrication of a metal insulator semiconductor Schottky barrier diode (SBD) with rare earth metal oxide (Yb2O3) thin films as insulators that are effectively developed on a large scale using the low-cost jet nebulizer spray pyrolysis technique (JNSP). The Yb2O3 thin films are deposited at various substrate temperat...
Article
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NiCuCoZn ferrites were synthesized using sol–gel auto-combustion method. X-ray diffraction (XRD) was used to confirm the ferrites’ cubic spinel structure. The lattice parameter was found to increase with increasing Co²⁺ ion doping concentration. The crystallite size is calculated using Scherrer’s formula; all prepared samples have crystallite sizes...
Article
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DLC coatings are deposited on aluminium substrates to improve the wear resistance property of the substrates using sputtering deposition in this study. DLC coatings are deposited using the graphite target onto the Al5051 substrates using DC sputtering. The deposited coatings are then analyzed for their adhesion strength, hardness, coefficient of fr...
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Introdução Localização e geologia da área Química mineral das escapolitas Materiais e métodos Resultados e discussões Conclusões Agradecimentos Referências RESUMO-Escapolita compreende uma série isomorfa de minerais aluminossicatos de cálcio e sódio, tendo como membros extremos Marialita (Ma)-Na4Al3Si9O24Cl e Meionita (Me)-Ca4Al6Si6O24CO3, com vari...
Preprint
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In this study, a series of nanocrystalline ferrites of Ni0.7Cu0.30AlxFe2-xO4 (x=0.00 to 0.10 with a step of 0.02) has been synthesized through the sol-gel auto combustion technique. The structural, morphological, dielectric, and electrical properties of the Ni-Cu spinel ferrite nanoparticles are analyzed due to the substitution of Al3+ content. The...
Preprint
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We investigated six presolar grains from very primitive regions of the matrix in the unequilibrated ordinary chondrite Semarkona with TEM. These grains include one SiC, one oxide (Mg-Al spinel), and four silicates. Structural and elemental compositional studies of presolar grains located within their meteorite hosts have the potential to provide in...
Article
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Green synthesis methods, nowadays, are being looked upon as a potential alternative to the already prevalent chemical and physical methods of synthesis of nanoparticles. In this present study, magnesium oxide (MgO) nanoparticles were synthesized from the flower extract of Madhuca longifolia by using microwave as a heating source. Morphological and...
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Controlled magnetic interactions in magnetic nanoparticles are a fundamental concern to the future development of nanometer-sized “magnonic” device applications. Here, we report the magnetization reversal mechanism in one-dimensional chain-like structures made of permalloy (Ni80Fe20) magnetic nanoparticles of about 200 nm diameters. Well-aligned an...
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Safe water provision in low-income countries is constrained by limited financial resources, and the problem is worsened during natural disasters. Thus, there is a need to develop efficient low-cost technologies for point-of-use water treatment. This work reports on the development of new ceramic microfiltration membranes made from mixtures of inexp...
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The present work comprises the application of a multi-analytical strategy based on the combination of several non-destructive and micro-invasive methodologies for the examination of the glazed tiles from the tomb of Benozzo Federighi made by Luca della Robbia. The marble tomb is framed by flat glazed terracotta tiles, each ornamented with naturalis...
Article
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AA 8079 with variable percentages of peanut shell ash (PSA) was created by stir casting (2.5 percent, 5 percent, 7.5 percent, 10 percent, 12.5 percent, and 15 percent). Compared some of the physical and mechanical properties of the composite material were to the alloy matrix alloy (density; porosity percentage; hardness; wear index; tensile strengt...
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Background Optimizing plant tissue culture media is a complicated process, which is easily influenced by genotype, mineral nutrients, plant growth regulators (PGRs), vitamins and other factors, leading to undesirable and inefficient medium composition. Facing incidence of different physiological disorders such as callusing, shoot tip necrosis (STN)...
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O estado de São Paulo possui 793 espécies de aves, representando 41% da avifauna do Brasil. Apesar deste número, muitos remanescentes de fitofisionomias nativas ainda não foram estudados, nomeadamente em propriedades privadas. Para fortalecer os planos e ações de conservação de aves em todo o estado, é necessário detalhar a distribuição das espécie...
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The size-resolved physiochemical properties of aerosols determine their atmospheric lifetime, cloud interactions and the deposition rate on the human respiratory system; however most atmospheric composition studies tend to evaluate these properties in bulk. This study investigated size-resolved constituents of aerosols on mass and number basis, and...
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Despite the growing cultural and linguistic diversity, monolingual ideologies are still rampant in American higher education. As an effort to decentre English-only, translingualism is gaining momentum in US college composition studies. Yet, existing research on translingual writing at the tertiary level remains largely conceptual and focused on in-...
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Major and trace elements are presented for 149 glass fragments ranging in date from the Roman to Early Islamic periods (1st – mid-8th centuries CE), excavated during the Danish-German Jerash Northwest Quarter Project's fieldwork between 2011 and 2016. The results confirm a clear dominance of Levantine glass types, but also reveal 12 glasses of Egyp...
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Tourism experience is a special experience compared to ordinary consumption experiences, and tourism researchers have paid much attention to study what composite tourists' memorable tourism experiences (MTE). As a result, several studies have been conducted to conceptualize MTE and identify its components. However, more systematic and comprehensive...
Article
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We carried out detailed compositional studies on fifteen sediment samples from the Brahmaputra River that were collected in the pre-monsoon period, to obtain the inherent contamination factor. The present study demonstrates that the degrees of metal contamination in the sediments of the Brahmaputra river. Typical metals Fe, Al, Ti, Pb, Zn, Cu, Ni,...
Article
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This work emphasizes the mechanical and tribological performance of Al-Si/Al2O3/MoS2 hybrid matrix composites. The composites are reinforced by varying weight percentages of Al2O3 (8%, 12%, and 16%) and MoS2 (0%, 2%, and 4%), and were prepared by stir casting. As the weight percentage of Al2O3 in a composite grows, so does its hardness and tensile...
Article
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Teaching/Writing: The Journal of Writing Teacher Education is a peer reviewed journal focusing on issues of writing teacher education – the development, education, and mentoring of prospective, new, and experienced teachers of writing at all levels. The journal draws from composition studies – writing program administrators, writing across-the-curr...
Presentation
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Classification of nonferrous metals. Importance of nonferrous metals in engineering applications & compositions, study of different mechanical properties: Cu & Cu based alloys, Al and Al based alloys, Ni and Ni based alloys, Co and Co based alloys, Titanium & its alloys, Tin & Lead base alloys, Bearing materials: important properties & applications...
Article
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Glass system was designed using the formula 34B2O3 – 9SiO2 – 18CaO – 14 P2O5 – (25 − x) Na2O - xTiO2, x = (0 ≤ x ≤ 5 mol%) in this article. Glass systems were investigated in terms of physical, structural, thermal, and mechanical characteristics. Furthermore, XRD was used to characterize amorphous nature systematically. The structural networks in t...
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In this paper, we investigated the optical and thermo-optical properties of a-SiNx:H layers obtained using the PECVD technique. SiNx:H layers with different refractive indices were obtained from silane and ammonia as precursor gases. Surface morphology and chemical composition studies were investigated using atomic force microscopy, scanning electr...
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Tire technology has evolved substantially by the introduction of brass-coated steel cords (BCSCs) in radial tires. The durability of radial tires is dependent on the integrity of the brass-rubber interface composed predominantly of nonstoichiometric copper sulfide (Cu2-x S, where x = 1 to 2) nanostructures whose morphology and characteristics are d...
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The Jian kilns in the present-day Jianyang County of Fujian Province are well known for their thick and lustrous black-glazed porcelain production. The hare’s fur (HF) glazed Jian wares characterized by radial fur-like strips, as one of the most typical representatives of black-glazed tea bowls, originate from phase separation of glaze melt and cry...
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Group IV quantum dots (QDs) in HfO2 are attractive for non-volatile memories (NVMs) due to complementary metal-oxide semiconductor (CMOS) compatibility. Besides the role of charge storage centers, SiGeSn QDs have the advantage of a low thermal budget for formation, because Sn presence decreases crystallization temperature, while Si ensures higher t...
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Background: Diets high in saturated fatty acids (SFAs) and greater abdominal obesity are both associated with raised low-density lipoprotein cholesterol (LDL-C) concentrations, an independent cardiovascular disease (CVD) risk marker. Although reducing SFA intake is a public health strategy for CVD prevention, the role of body fat distribution on t...
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Electrode is vital component in solar cell which determine the efficiency of solar cell. The aim of present work to propose an efficient and low-cost material for electrode in solar energy area. Herein we synthesized oleic acid (OA) coated Ag-Cu alloy doped with MWCNTs nanocomposite. Oleic acid coated AgCu doped with MWCNTs nanocomposite was charac...
Article
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Objectives To examine the longitudinal association between subclinical hearing loss (SCHL) and neurocognitive performance. Design Longitudinal analyses were conducted among 2,110 subjects who underwent audiometric testing in a US multi-centered epidemiologic cohort study. The primary exposure was better ear hearing (pure tone average). SCHL was de...
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This research was carried out to determine some of the nutritional compositions of dried fermented African locust beans powder. Fermented locust bean is generally prone to deterioration and therefore adequate preservation methods are essential to obtain bean powder of good quality. In this study, two drying methods (sun and oven drying) were used t...
Article
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Background In older adults, kidney function declines with age. People with advanced kidney diseases may have poor olfaction. However, it is unclear whether poor olfaction is a marker for declining renal function or future risk of chronic kidney disease (CKD). We therefore investigated olfaction in relation to kidney function and risk of CKD.Methods...
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Structure formation during solidification of a Pd–Ni–Cu–P melt is studied. It is demonstrated that changes in the heat transfer conditions lead to a nonlinear change in the characteristics of the structure. The article presents the regimes of cooling the samples and the results of their structure and composition studies. It is found that a decrease...
Article
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Prosopis africana (G. &Perr.) Taub (Mimosaceae) is a large tree native to dry tropical Africa and characteristic of dry leguminous forests. Different parts of this plant are used to treat wounds, skin infection, and to fight against cancer. Literature review indicated various pharmacological properties. Despite these medicinal properties, the chemi...
Article
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The alkaline electrolytic production of iron is gaining interest due to the absence of CO2 emissions and significantly lower electrical energy consumption when compared with traditional steelmaking. The possibility of using an iron-bearing pseudobrookite mineral, Fe2TiO5, is explored for the first time as an alternative feedstock for the electroche...
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The complex dielectric relaxation behavior of a biodegradable polymer composite is probed in the present investigation. The polymer composite was modeled using biodegradable polymer poly (lac-tic) acid (PLA) as matrix and natural fiber of Luffa cylindrica (LC) as reinforcement using microcompounding and injection molding. Aforetime the LC fibers us...
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The main disposal method for municipal solid waste in Nigeria is open dumps. Generators of waste either burn their waste or dispose the waste in the nearest open land, road sides, or drains. This has been found to not only be unsustainable but leads to environmental, health, and aesthetic damage, as well as depletion of natural and economic resourc...
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Due to their remarkable structures and properties, three-dimensional hydrogels and nanostructured clay particles have been extensively studied and have shown a high potential for tissue engineering as solutions for tissue defects. In this study, four types of 2-hydroxyethyl methacrylate/2-acrylamido-2-methylpropane sulfonic acid/montmorillonite (HE...
Article
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PbO/ZnO core/shell nanocomposites dispersed in PVP has been synthesized through chemical route with a thickness variation of ZnO shell. The structural, optical and electrical characterization are done and correlated with the shell thickness. PbO shows an orthorhombic structure and that of PbO/ZnO contain the hexagonal phase of ZnO. HRTEM and SEM co...
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Rationale & Objective The difference in estimated glomerular filtration rate between cystatin C and creatinine (eGFRDiff) is known to be associated with frailty and mortality. Creatinine is influenced by muscle mass, more so than cystatin C; we aimed to determine whether eGFRDiff is associated with muscle quantity and to what extent muscle quantity...
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This article reviews literature in composition studies since affective science's emergence in the 1980s. It focuses on composition studies’ history of adopting findings and theories from affective science, and distinguishes trends in how the field applies those elements in theoretical versus pedagogical contexts. While composition studies’ adoption...
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Recurring slope lineae (RSL) are small, dark, seasonal albedo features lengthening down "warm" Martian steep slopes. Their origin has been attributed to both liquid and dry processes, hence representing one of the major open science questions on present day Mars. In the present study, we report a catalog of previous literature and newly added RSL s...
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Objectives The objectives of the study were to assess the white spot lesions around orthodontic bracket macroscopically using two different bonding agents – one with amorphous calcium phosphate (ACP) (Aegis Ortho) and one without ACP (Transbond XT). Materials and Methods The study comprises 10 patients from 14 to 23 years of age. Patients were div...
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To evaluate the effects of microstructure characteristics on the properties of SiC/SiC composites (Silicon Carbide Fiber/Silicon Carbide Matrix), models with different fiber and void shapes are analyzed with the FFT-based method. Especially for the voids, a newly developed method is presented for the random void generation. The FFT-based method is...
Article
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In this work, biochar was introduced as a filler into the aliphatic-aromatic copolyester and polylactide blend. Properties and the changes during degradation of obtained materials were evaluated. A new application path was also determined by lowering the surface resistivity by increasing the biochar content. Measurements of elec-trostatic propertie...
Conference Paper
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Thin films of TiO2 doped with carbon were deposited on 15×25×1 mm 3 glass substrates by r.f. magnetron co-sputtering of TiO2 target and carbon plates on their erosion zone in Ar + air atmosphere (0.5 Pa and 0.6 Pa, respectively). Two different process parameters were varied in different experiments: the total area of the carbon plates (84 mm 2 , 56...
Article
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The aim of this study is to investigate the effects of recycling on the mechanical properties of Elium resin reinforced by flax fibers. A thermocompression recycling process is investigated and applied to production waste of thermoplastic composites. Five recycling operations are carried out on the initial material. Specimens are tested under stati...
Article
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Solid waste decision makers use waste composition studies in sustainability planning and as metrics to measure their environmental benefits (e.g., recycling rates). In many of these studies, there are varying waste components and number of samples assessed. Often, studies will rarely determine whether the number of samples sorted was actually suffi...