Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Catalytic conversion of methanol to light olefins (MTO) over acidic zeolites is currently one of the most prominent alternatives to traditional crude oil cracking processes for the production of ethene and propene. The underlying reaction mechanisms have been under debate for decades, with current insight strongly sup…
In this work, a series of polycrystalline silicon films (pc-Si) were deposited by plasma-enhanced chemical vapor deposition (PECVD) to potential applications in solar cells. The power range was varied between 2 and 15 watts. Optical properties were analyzed by transmittance measurements as a function of wavelength and…
Neolamarckia cadamba or locally known as Kelampayan, is one of the light hardwood trees that holds great prospects as a source of raw materials for the paper, pulp, wood and biofuel industries. Sufficient information on cellulose synthase gene, especially the hypervariable region II component involved in wood formatio…
An improved hydrothermal method was adopted to prepare BiFeO3 crystallite using Bi(NO3)3·5H2O, Fe(C5H7O2)3 as raw materials and 2-Aminoethanol as alkaline precipitant. The effects of the quantity of pre- cursor precipitate, the concentration of mineralizer, and the reaction temperature on the morphology of prod- ucts,…
Many products are manufactured and assembled from a combination of different components. To connect these components, good combined joints are paramount. \n \nSoldering is a method of combining joints and it is the main focused fastening method used in this project as it is permanent, easily combined, less time consum…
First and foremost
采用溶胶-凝胶法合成了Sr2Si O4：Sm3＋红色荧光粉,用XRD、SEM、PL对样品进行了结构、型貌及发光性能表征。结果表明,所得样品为单斜晶系结构,呈粒径为0.1~0.3μm、1μm左右长的纤维状小颗粒;在波长402nm的紫外激发下,样品发射光谱由位于红橙区的3个主要荧光发射峰组成,峰值分别位于568,605nm和651nm,对应了Sm3＋的4G5/2→6H5/2,4G5/2→6H7/2和4G5/2→6H9/2特征跃迁发射,605nm的发射最强,是一种适用于白光LED的红色荧光粉。
以45钢缸套内孔表面为基体,电沉积得到Fe-Ni-W合金镀层。采用目视评价、显微硬度计、中性盐雾试验、盐水浸泡试验及干性条件的摩擦磨损试验等方法,研究了Fe-Ni-W合金镀层的外观、显微硬度、耐蚀性、耐磨性等性能。结果表明,Fe-Ni-W合金镀层光亮、细致,镀层在最佳温度500～650°C下热处理2h后硬度最高可达1300HV。经120h中性盐雾试验[w（NaCl）=5%]后,Fe-Ni-W合金镀层表面保持光亮,完全没有锈迹,用盐水浸泡200h内不生锈。Fe-Ni-W合金镀层的摩擦因数在600°C热处理前后均低于铬镀层,分别约为0.46和0.41。经干性条件摩擦后,镀层表面只有轻微模糊的磨痕和细而浅的犁沟。
The work contained in this thesis is concerned with the elucidation of the growth mechanism responsible for the formation of silicon dioxide by plasma anodization. Three possible theories for the growth mechanism have been considered; namely, (1) the rate-limiting diffusion theory (2) the classical theory of high-fiel…
A study has been undertaken to investigate the loss of ductility and modified work hardening characteristics of zinc single crystals coated with mercury. Important results of tensile tests performed under fixed experimental conditions are summarized to be: (1) increase in critical resolved shear stress, and increase o…
Objetivos: esta revisão teve como objetivo analisar e discutir estudos sobre os principais fatores de crescimento testados in vitro e in vivo na regeneração de nervos periféricos. Fonte de dados: os artigos foram selecionados nas bases de dados LILACS, Medline e SciELO, utilizando os seguintes descritores: regeneração…
The relationship between surface energy and precipitated graphite form in Fe-C alloys was examined in this thesis.Surface tension and contact angle data were obtained using the sessile drop technique. Carbon saturated, puron iron crucibles were melted on pyrolytic graphite, the effect of time, temperature (1500-1600°C…
Molecular dynamics simulation of nanochannel flows by Liu Chong thesis 2011 xvi, 104 p. : ill. ; 30 cm Nanoscale fluid flow systems involve both microscopic and macroscopic parameters, which may couple with each another and lead to many special…Read more ›
用固相合成法制备La3＋掺杂Co0.5Ni0.5（Fe0.5Cr0.5）2O4尖晶石体系红外辐射材料,并通过DTA-TG、XRD和IRE-2型红外辐射测试等方法研究了材料的结构特征与红外辐射性能的关系,结果表明：随着La3＋含量的增加,La3＋以不同的形式进入Co0.5Ni0.5（Fe0.5Cr0.5）2O4体系中,当La2O3掺杂浓度为5%（质量分数）时,样品的法向全波段辐射率达到0.91。
The increasing number of analytes in concern and the alarming health and environmental consequences have required effective means of monitoring for safety control. Biosensors offer advantages as alternatives to conventional analytical methods because of their inherent specificity, simplicity, and quick response. Color…
This Special Issue devoted to 'The legal regulation of nanotechnologies' draws together contributions from some of the leading commentators in their respective fields. The Special Issue canvasses some of the most pressing philosophical, ethical and regulatory questions currently being debated around the world in relat…
The reflectivity of large single crystals of protonated and deuterated (TMTSF)₂Re0₄ and (TMTSF)₂BF₄ has been measured from ≈ 30 cm-¹ to ≈ 8000 cm-¹ using a Bruker IFS 113V Fourier Transform Interferometer for Ea and Eb' above and below the metal--insulator transitions at 177 K and 39 K respectively. The infrared powde…
INTRODUCTION: The strict hierarchy and parallel arrangement of myofibres within skeletal muscle tissue has made in vitro regeneration of this tissue difficult. Creating a biodegradable template scaffold to encourage myoblast and consequent myofibre alignment may be beneficial. This work focuses on electrospinning of t…
An experimental study of the low lying excited states of C¹¹ has been made using the B¹⁰(d ,nɣ )C¹¹ reaction at a deuteron bombarding energy of 0.8 Mev. Measurements were made of the n- ɣangular correlations of the ground state gamma transitions from the 6.49 and 4.32 Mev levels, and of the gamma ray branching ratios…
Wide band gap semiconductors are attractive for several microelectronic and photonic applications such as high power amplifiers, LEDs and laser diodes. Particularly, GaN-based semiconductors are promising as they exhibit attractive properties such as low intrinsic carrier concentration and high thermal conductivity, e…