Materials Literature
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Graphene grown on transition metal is known to be high in quality due to its controlled amount of defects and potentially used for many electronic applications. The transfer process of graphene grown on transition metal to a new substrate requires optimization in order to ensure that high graphene coverage can be obta…
Urgency of the research. The quality and accuracy layers surface of the part, in the first place, is determined by the parameters of the grinding operation. The cutting process, at grinding, is not performed by all the cutting grains of the working surface of the abrasive wheel, but only by those that are above the bu…
This study assessed the chemical and spectroscopic characteristics to contrast the Brazilian Soil Classification System for Latossolo Bruno. The soil samples of A, AB, BA and B horizons from Latossolo Bruno analyzed in this study were collected in Abelardo Luz, Santa Catarina state, Brazil. The humic acid fraction was…
Solid films of electroactive π-conjugated oligomers show distinct redox behaviour from that in solution, with interesting morphological changes accompanying oxidation.
The article is devoted to the measuring methods used to determine the high limit of horizontal cross forces applied to the track generated at the curved movement of freight-car truck equipped with elastic side bearings. Based on the investigation of the measuring scheme of the freight-car truck wheels running upon the…
The article gives a quantitative assessment of the process of atoms diffusion activity by means of increasing the temperature based on the method of molecular dynamics simulation. The assessment is based on the formation of voids (dilatons) and condensations educed during the simulation process. As a result, the coope…
In this paper, we propose an approach for estimation of structural changes at the surface of metallic materials during running-in stage of friction. The application of synchrotron microbeam for in-situ observation of structural evolution in thin layers subjected to friction load is substantiated. A design of experimen…
Additive Manufacturing (AM) of tailored natural biopolymer-based objects by Fused Deposition Modeling (FDM) opens new perspectives for applications such as biomedical temporary devices, or pharmaceutical tablets. This exploits the biocompatibility, resorbability and edibility properties of biopolymers. When adequately…
Background: The therapeutic effectiveness of active pharmaceutical ingredients (API) depends on their solubility. API, which has poorly soluble drugs, can cause low bioavailability. According to the biopharmaceutical classification system (BCS), glibenclamide is classified under BCS Class II drugs), which has low solu…
Protection materials are continuously facing higher velocity threats; characterizing their response to these threats is necessary to improve performance. We have previously examined failure of boron carbide and magnesium systems at strain rates of up to 10 5 per second [12,13]. To study dynamic deformation at higher s…
By combining 2 H-NMRD and CP/MAS 13 C-NMR measurements of water-based cellulose gels and of water swollen pulps it was possible to estimate the nature of the interior structure of cellulose fibril aggregates. A set of samples with high cellulose purity and low charge was used. The interpretation of data was based on a…
A single peak in thermal desorption profiles of hydrogen, which are measured in low-temperature thermal desorption spectrometry (L-TDS) for a very thin plate specimen of tempered martensitic steel, was reproduced successfully to evaluate the peak temperature by the superposition of two Gaussian distributions. We calcu…
城市小型湖泊具有对环境变化的高敏感性，其浮游植物群落特征和演替规律对湖泊生态系统的监测与管理有重要意义。本研究于2015年3-12月，对武汉市沙湖进行了生态和水质监测，共鉴定出藻类10门312种，绿藻、硅藻和蓝藻种类数占优。为探究富营养化城市小型湖泊浮游植物群落时空异质性及其演替驱动力，选取了4个多样性指数（Shannon-Wiener指数、Simpson指数、Pielou均匀度指数和Whittaker指数），并进行了多样性指数与环境因子的相关性分析、主成分分析和聚类分析，计算了优势种在监测时段的3个种间联结性指数和校正χ2检验系数。结果表明，夏秋季节浮游植物群落处于演替的稳定状态，环境因子驱动作用明显，其中离子浓度的影响大于温度…
Abstract. In order to reduce the unavoidable grain losses during harvesting, the combine harvester‘s operational parameters should be adjusted accordingly. So, it is important to develop a real-time sensor which can monitor the grain losses. A grain impact sensor utilizing crossed piezoelectric polyvinylidene fluoride…
The polymethyl-methacrylate (PMMA)-based composites were prepared using goose feather fibers at different diameters. The fibers, which were washed and dried, cut through the shaft, and their sizes were shrunk to short fiber form. Then the obtained short fibers were added into acryl matrix in portions of 2%, 4%, 6%, an…
Wehrlite samples (size: ~4 cm) hosted in basaltic lavas from the SW of Hosséré Dammougalré are located in the western Adamawa Plateau. Porphyritic and allotriomorphic texture characterize respectively host Basalt and wehrlite xenoliths. The phenocrysts of olivine (Fo68−74), and Ti-magnetite are scattered in host basal…
Pyrazolone 4-phenylthiosemicarbazones show excellent solid-state photochromic properties, thermal stability and fatigue resistance upon the UV/Vis irradiation.
Cet article présente les résultats de travaux expérimentaux visant à étudier un plasma formé par une décharge électrique immergée entre des copeaux de cuivre. Deux dispositifs expérimentaux ont été utilisés : une unité technologique permettant la synthèse de solutions métalliques colloïdale, et un dispositif permettan…
In the work we carried out microwave synthesis of modified hydroxyapatites (HA) with different content of ions. A solid solution based on HA remains a single-phase sample when the calcium ions are substituted by silver and zinc ions up to 5 % by weight (0.5 mole fraction). The microstructure parameters, morphology and…
The synthesis of novel 1-(2-anthryl)-1-phenylethylene (APE) di-telechelic polyisobutylenes is described. Utilization of a difunctional cationic initiator and the in situ addition of the non-homopolymerizable APE lead to the formation of di-anthryl telechelic polyisobutylenes. Products were characterized by 1H NMR spec…