Materials Literature
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In order to analyze the icing flashover characteristics of post insulators with composite assistant shed(CAS),we investigated the performance of energized 500 kV post insulators in the presence and absence of CAS by icing test in a large-scale artificial climate chamber,and analyzed the difference of ice appearance,fl…
Coal is an important fossil fuel with highest carbon content.Huge amount of CO2 emission caused by the use of coal has attracted high attention.In this paper,a new concept which is directed by low-carbon economy was proposed for the development of coal chemical industry in China.According to the actual situation in Ch…
Giant magnetostrictive materials are new functional materials developed since 1970's,characterized by giant magnetostrain and powerful energy conversion.In this paper,an introduction of magnetostriction and the history of giant magnetostrictive materials,and a number of important research results obtained by our scien…
Free expansion,three-direction expansion stresses and strength of concrete under restraints were investigated.Results indicate that free expansions of concrete with 0%,5%,8% and 12%(by mass) MgO are-33×10-6,90×10-6,230×10-6 and 320×10-6 at 560 d.The strength of concrete with MgO restrained in three-dimension is higher…
The matrix random cracking of ceramic matrix composite was simulated by Montel Carlo model.The shear-lag model was used to analyze the micro-stress field of the damaged composites,and the formula of the stress-strain behavior was derived.The uniaxial tensile experiment of unidirectional-C/SiC composites at ambient tem…
Acidic montmorillonite(H-MMT) was managed to be prepared by treating Na-montmorillonite with H2SO4 under microwave irradiation.The structure and characters of the H-MMT were studied by BET,NH3-TPD and DTA/TG techniques.The results revealed that H-MMT had greater surface area and pore volume,the super acid sites were f…
Porous polyimide(PI) films containing lubricant oil were obtained from the controllable porous PI films using silica microspheres as the template.The content of lubricant of the PI films containing lubricant oil and inner porous can be controlled by adjusting the weight content of silica microspheres.It is found the o…
Inorganic materials such as sodium silicate and aluminum sulfate can be used as additives to improve mechanical and fire resistance performances of plant fiber-based ultra low density material(ULDM) during its making process using the liquid frothing approach.Following process was used to make sample mats:after fiberi…
Exploiting clean and sustainable energy resources has become an urgent need worldwide. Solar energy is regarded as one of the most ideal energy resources.1 Huge efforts have been invested to develop high efficiency solar energy conversion technologies. The emerging photovoltaic industry has been gro...
ACTA CHIMICA SINICA 甲氨蝶呤/层状双金属氢氧化物的粒径调控及缓释性能研究 齐凤林 李淑萍 * 张晓晴 (江苏省生物功能材料重点实验室 南京师范大学化学与材料科学学院 南京 210097) 摘要 在乙醇-水混合体系中, 以氨水为沉淀剂共沉淀合成了甲氨蝶呤/层状双金属氢氧化物(MTX/LDH)纳米复合物, 首次采用控制沉淀剂滴加速率的方式来调控其粒径. 利用 X-射线衍射(XRD)、透射电镜(TEM)和红外光谱(FT-IR)等表
Material strengthening can be achieved by means of effectively intercepting the dislocation motion by some obstacles. The representative one is grain boundary (GB) strengthening, called Hall-Petch relationship (H-P effect). Since such an interaction between dislocation and GB always happens at any plastic deformation…
When TEMPO-mediated oxidation is applied to wood celluloses in water at pH 10 under suitable conditions, almost all glucosyl units exposed on crystalline cellulose microfibrils are selectively oxidized to sodium glucuronosyl units. The TEMPO-oxidized celluloses thus obtained have the same fibrous morphologies as those…
In this study, the mechanism of equalization for λ1 has been investigated using succinonitrile-1.0 mass% water alloy. Approximately 15 columnar dendrites have been observed and the maximum and the minimum value of λ1 (λ1Max and λ1Min, respectively) have been characterized. It is found that λ1Max decreased and λ1Min in…
Highly transparent aluminas were synthesized by SPS processing under the conditions of 100 MPa and 200°C/min. High in-line transmittances of about 30 % at λ=400 nm and more than 60 % at λ=800 nm were obtained for the aluminas sintered at 1150°C for 10 min-45 min or at 1200 for 10 min. The in-line transmittance monoton…
At the beginning of solidification in the mold, both temperature gradient (G) and growth velocity (V) are large. But, as solidification proceeds, G and V become small. It is known that solidification structure varies with solidification condition. However, the mechanism of change in solidification structure is still u…
Designing and manufacturing of vascular prosthesis for arterial bypass grafts is a very complex problem. The process involves the selection of suitable geometry, materials of appropriate characteristics, and manufacturing technique capable of constructing prosthesis in a cost-effective manner. In this chapter, all eng…
This paper presents the strong nonlocal scale effect on the terahertz flexural wave dispersion characteristics of a monolayer graphene sheet, which is embedded in elastic medium. The graphene is modeled as an isotropic plate of one atom thick. The chemical bonds are assumed to be formed between the GSs and the elastic…
Polycrystalline zinc sulphide thin film was synthesized on quartz substrate by spin coating technique. Phase pure ZnS with hexagonal wurtzite structure was revealed from XRD. SEM micrograph shows formation of polycrystalline grains on the surface. The measured bandgap energy was ~3.70 eV and it was on higher side of t…
Objectives: Digoxin is a drug with very low aqueous solubility, low therapeutic dose and low therapeutic index. Soft gelatin capsule is an ideal dosage form to formulate low soluble drugs that provides faster dissolution, higher bioavailability and higher content uniformity. The purpose of the present study is to enha…
Composite panels made by hand lay-up technique from randomly oriented coconut palm frond fibers reinforced polyester matrix were investigated. The results show that the highest values of 10.26MPa and 78.98MPa for respective tensile and flexural strength properties were observed at 10% fibre content by weight in the co…