Materials Literature
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Abstract. This paper presents the epilithic diatom flora from rivers Vit and Osum. Twenty-eight sampling sites were chosen along the river catchments, from the springs to the inflows (the Danube River). A total of 114 diatom taxa (103 species and 11 varieties) from 36 genera were identified in the epilithon of the stu…
The paper presents a new method of obtaining aluminium oxide composite layers formed by means of hard anodizing in an electrolyte composed of water solution of acids and graphite. The produced layers were subject to tests and their results, such as the influence of process parameters on the properties of composite lay…
Damping capacity (tanδ) of Ti-24 mol%Nb-3 mol%Al (Ti-Nb-Al) shape memory alloy (SMA) with {001}β〈110〉β texture was examined upon cooling from 423 K to 123 K by dynamic mechanical analysis (DMA) in a tensile mode. The {001}β〈110〉β texture was well developed by a cold-rolling with reduction in thickness of 99% followed…
Abstract. One hundred and twenty-two diatom taxa were identified from twenty-nine sites on small rivers and streams in low-inhabited mountain regions in the river Strouma basin (SW Bulgaria). Almost all sites were studied for the first time. Thirty-tree of the taxa were reported for the first time for the Strouma basi…
A series of octakis(alkyloxy)-substituted Zn(II)-phthalocyanines were efficiently incorporated into an organogel made of (1R,2R)-trans-1,2-bis(dodecanoylamino)cyclohexane by means of multiple cooperative non-covalent interactions, and SEM revealed the formation of unique brush-like nanostructures.
The recombination reactions of free radicals formed from the photolysis of a series of polymerisation photoinitiators were studied using time-resolved infrared spectroscopy. All molecules showed Zeeman magnetic field effects (MFEs) in the field range 0-37 mT and those molecules that produced radical pairs with average…
In this communication, we report the self-organization of a perylenedicarboximide to produce materials that exhibit dichroic (direction-dependent) absorption and anisotropic fluorescence emission of visible light.
The early stages of nanoporous layer formation, under anodic conditions in the absence of light, were investigated for n-type InP with a carrier concentration of in KOH and a mechanism for the process is proposed. At potentials less than , spectroscopic ellipsometry and transmission electron microscopy (TEM) showed a…
In this article the mechanical and magnetic properties of magnetic fibre based on experimental investigation are described. These magnetic fibres, made up of cellulose matrix and powdered magnetic modifier, were used to build textile magnetical coils with a textile core. Textile magnetic coils are elements of electric…
Si-nanocrystal memories have been fabricated using the thermal agglomeration of an ultrathin ( 0.9 – 3.5 nm ) amorphous Si ( a -Si) film. The a -Si was deposited by electron beam evaporation followed by in situ annealing at 850 ° C for 5 min . Hemispherical nanocrystals were obtained with a dot density up to 3.9 × 10…
An investigation of yarn motion in yarn ducts with various cross-sectional shapes and its effects on the characteristics of interlaced yarn is reported. Seven interlacers, which are different in the cross-sectional shape of yarn duct, have the same cross-sectional area. Yarn motion in the yarn duct was observed with 1…
MnFe2O4 多晶的粉末被化学一起沉淀方法准备。反应温度什么时候在 80 ° C 上面，通过扔；洗，没有锻烧， MnFe2O4 能直接被获得。然而，当它在 80 ° C 下面时，我们不得不锻烧先锋以便获得 MnFe2O4，它不导致纯针的结构但是 MnFe2O4 的混合物；α - Fe2O3。粉末的磁性与一个颤动的样品磁强计被描绘。阶段结构，晶体大小；晶格常数被 X 光检查衍射计介绍。另外，粉末的形态学与一台扫描电子显微镜被观察；一台传播电子显微镜。
PVC 的热分解特征系统地用联合到四极质谱仪的 aNetzschne TG thermo 平衡被调查。热分解条件是 Ar， 10 ℃ / min 的加热的率和 1000 ℃的最后的温度的 0.1 MPa。thethermogravimetric 性质和气体的产品的同时的进化在热分解期间被学习。当热分解温度增加重量损失和 PVC 增加的重量损失率， TG/DTG 结果显示出那。在 412 ℃附近，重量损失率达到了它的山峰价值。Athigher 温度损失的率逐渐地减少。在 thermogravimetricanalysis 期间发展的气体被一个集体分光计分析，监视 HCl， C_6H_6，轻烃和包含氯的气体的相对紧张。进化曲线证明 H…
Three failure modes of penetration mechanisms,i.e.,Taylor impact,petal-cap failure of Sunflower alike and plugging perforation, of Fragment Simulation Projectiles(FSP),were observed in the experiments of A3 steel blunt projectiles impacting 45 steel plates.Numerical simulations with LS-DYNA was conducted to analyze th…
Although most rutile‐type difluorides (MnF2, CoF2 and NiF2) have a positive thermal expansion coefficient, FeF2 has a negative thermal expansion (NTE) along the c‐axis in the high temperature region. In this study, we give an explanation of that behavior with Extended X‐ray Absorption Fine Structure (EXAFS) and X‐ray…
This paper presents the synthesis of nano-composite Cu-Al2O3 powder by a thermochemical method and sintering, with a comparative analysis of the mechanical and electrical properties of the obtained solid samples. Nano-crystalline Cu-Al2O3 powders were produced by a thermochemical method through the following stages: s…
Nickel displacement deposition into porous silicon with pores of aspect ratio as high as has been experimentally studied. High degree of thickness uniformity of the plated nickel inside the pores has been achieved by controlling the plating bath chemistry and the reaction time. The deposited nickel displaces the Si th…
Abstract A continuous gas‐phase process under atmospheric pressure for tailoring Pd/SiO 2 catalyst particles is described and characterized. Emphasis is placed on controlling the size and number density of Pd nanodots on the surface of the carrier particle. In the first step, sub‐micrometer‐sized SiO 2 support particl…
Two new sandwich-type heteropolyoxometalates, Na(14)[Co(2)Bi(2)(beta-B-CoW(9)O(34))(2)].48H(2)O (1) and Na(14)[beta-B-Zn(2)Bi(2)(ZnW(9)O(34))(2)].51H(2)O (2), have been synthesized at pH = 7.5-8 and characterized by elemental analysis, IR, UV-vis, TG-DSC and electrochemistry. Structural analysis indicates that both po…
We succeeded in regulating the growth of diatom cells on chemically modified glass surfaces. Glass surfaces were functionalized with -CF3, -CH3, -COOH, and -NH2 groups using the technique of self-assembled monolayers (SAM), and diatom cells were subsequently cultured on these surfaces. When the samples were rinsed aft…