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The Properties of Native Silk Fibroin (SF) Solution/Gel from Bombyx mori Silkworms during the Full Fifth Instar Larval Stage

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Journal of Wuhan university of Technology(materials science) 2011年第2期26卷 263-269页

作者：王洪 Key laboratory of Textile science & Technology Ministry of EducationDonghua University

The properties of native silk fibroin （SF） solution in the gland of silkworms during the full fifth instar larval stage were examined in an attempt to elucidate the mechanism of natural silk spinning in the *** flow and gelation behavior,birefringence phenomenon,rheological properties,specific viscosity and conformation of SF solutions from the gland of silkworms were measured by polarized light microscope,HAKKE rheometer,Ubbelohde viscometer and solid-state 13C NMR,*** comparing their properties with regenerated SF solutions from natural silk fibers,it is believed that there exists a progressive maturation process favorable to spin silk fibers with excellent properties from native SF solution and a weak bonded and highly oriented SF gel network with SF molecules partly extended in α-helix conformation is formed in the middle section of the gland of *** suggests that a biomimetic maturation process for making spinnable solution might be necessary for artificial silk fiber spinning in order to obtain improved fiber properties.

关键词： silk fibre spin viscosity sol/gel

Effect of leachate inoculum on biopretreatment of municipal solid waste by a combined hydrolytic-aerobic process

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Journal of Environmental sciences 2009年第8期21卷 1162-1168页

作者： ZHANG Dongqing, HE Pinjing, SHAO Liming state Key laboratory of Pollution Control and Resources Reuse, Key laboratory of Yangtze River Water Environment, College of Environmental science and engineering, Tongji university, Shanghai 200092, china. state Key laboratory of Pollution Control and Resources Reuse Key Laboratory of Yangtze River Water Environment College of Environmental Science and Engineering Tongji University Shanghai 200092 China

The biopretreatment of municipal solid waste by a combined hydrolytic-aerobic process has become of great interest for biostabilization or biodrying. The study aimed at investigating the effect of leachate inoculurn on the biopretreatment. During the hydrolytic stage, the inoculum addition at the ratio of leachate to waste （LWR） of 5% and 7% stimulated the start-up of hydrolysis and enhanced the hydrolysis rate by 27.4% and 24.2%, respectively; whereas the inoculation at LWR of 1% had almost no effect on the hydrolysis rate and the inoculation at LWR of 10% reduced the hydrolysis rate by 12.7%. During the subsequent aerobic stage, the inoculations at LWRs greater than 5% decreased organics degradation rate. As a whole, compared with none inoculation, the total degradation rates of organics for inoculating trials at LWRs of 5%, 7% and 10% decreased by 14.5%, 14.3% and 32.7%, respectively. Correspondingly, their net water removal rates were reduced by 4.4%, 5.8% and 19.0%. The inoculation at LWR of 1% could not significantly affect the biopretreatment. The inoculum addition at LWR of 5% and 7% could shorten hydrolytic stage and thus accelerate the whole combined process. Moreover, the inoculations at LWRs greater than 5% were favorable for lignocelluloses degradation.

关键词： biopretreatment hydrolysis-aeration inoculation leachate municipal solid waste

A particle-based method for granular flow simulation

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science china(Information sciences) 2012年第5期55卷 1062-1072页

作者： CHANG YuanZhang 1,BAO Kai 2,3,ZHU Jian 1 & WU EnHua 1,2 1 department of Computer and Information science,university of Macau,Macao,china 2 state Key laboratory of Computer science,Institute of Software,Chinese Academy of sciences,Beijing 100190,china 3 Division of Mathematical and Computer sciences & engineering,KAUST,Thuwal,Saudi Arabia department of Computer and Information science University of Macau Macao China state Key laboratory of Computer science Institute of Software Chinese Academy of Sciences Beijing China Division of Mathematical and Computer sciences & engineering KAUST Thuwal Saudi Arabia

We present a new particle-based method for granular flow *** the method,a new elastic stress term,which is derived from a modified form of the Hooke's law,is included in the momentum governing equation to handle the friction of granular *** force is also added to simulate the dynamic friction for the purpose of smoothing the velocity field and further maintaining the simulation *** from the Lagrangian nature of the SPH method,large flow deformation can be well handled easily and *** addition,a signed distance field is also employed to enforce the solid boundary *** experimental results show that the proposed method is effective and efficient for handling the flow of granular materials,and different kinds of granular behaviors can be well simulated by adjusting just one parameter.

关键词： granular materials sand smoothed particle hydrodynamics SPH Hooke’s law animation simu-lation

Controllable synthesis of Ni-catalyzed tetragonal tungsten nanowires via chemical vapor deposition

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Progress in Natural science:materials International 2012年第5期22卷 514-519页

作者： Chao Wang a,Yuehui He a,Chaoqun Peng b,Shiliang Wang a,c,Xinli Liu a a state Key laboratory of Powder Metallurgy,Central South university,Changsha 410083,china b School of material science and engineering,Central South university,Changsha 410083,china c School of Physics science and Technology,Central South university,Changsha 410083,china state Key laboratory of Powder Metallurgy Central South University Changsha 410083 China School of material science and engineering Central South University Changsha 410083 China School of Physics science and Technology Central South University Changsha 410083 China

Tetragonal single-crystal tungsten nanowires were successfully synthesized by chemical vapor deposition(CVD) catalyzed by Ni *** influences of the catalysts,temperature and growth time on the formation of the nanowires were *** was found that the tetragonal tungsten nanowires(WNWs) arrays were obtained by deterministic growth from the ordered Ni catalyst particles with one-to-one relation in size and position between the catalysts and *** large-scale tungsten nanowire arrays were synthesized at the low temperature of 950℃.Samples were characterized by X-ray diffraction(XRD),field-emission scanning electron microscopy(FE-SEM),transmission electron microscopy(TEM) and high-resolution transmission electron microscopy(HRTEM).Increasing growth time at 950℃,the tip of the WNWs changed from four(211) planes to four(110) *** controls of the orientation and structure of WNWs arrays were important for adjusting their properties to satisfy different requirements of potential nanodevices.

关键词： Tungsten nanowires Ni catalysts Chemical vapor deposition Nanostructures

稀土Gd_5Ge_2(Si_(2-x)Al_x)合金系的晶体结构和磁卡效应研究

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中国稀土学报 2003年第Z1期21卷 114-116页

作者：黄军平罗广圣唐少龙吴小山南昌大学材料科学与工程学院江西南昌330047 南京大学国家固体微结构实验室江苏南京210093

用磁控电弧炉在氩气气氛下熔炼了Gd5Ge2(Si2-xAlx)(x=0,0.1,0.2,0.5,1.0)系样品。X射线粉末衍射分析表明,样品基本为单相结构,其晶体对称性不会随Al含量的增加而改变。用振动样品磁强计测量了样品的M T曲线和不同温度下的M H曲线。居里... 详细信息

用磁控电弧炉在氩气气氛下熔炼了Gd5Ge2(Si2-xAlx)(x=0,0.1,0.2,0.5,1.0)系样品。X射线粉末衍射分析表明,样品基本为单相结构,其晶体对称性不会随Al含量的增加而改变。用振动样品磁强计测量了样品的M T曲线和不同温度下的M H曲线。居里温度随Al含量x的增加略有减小,当x=0.2时Gd5Ge2(Si2-xAlx)有最大-ΔSM值。退火对样品的居里温度和磁卡效应影响不大,退火前后的居里温度和磁卡效应基本保持一致。

关键词：磁热效应磁熵变晶体结构居里温度稀土

Effect of the Structure and Acidic Property of Activated Bentonite on Removal of Olefin in Aromatics

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china Petroleum Processing & Petrochemical Technology 2009年第4期11卷 23-26页

作者： Wu Wenjuan Chen Changwei Wang Xin Shi Li (The state Key laboratory of Chemical engineering,East china university of science and Technology, Shanghai 200237) state Key laboratory of Chemical engineering East China University of Science and Technology Shanghai 200237 China

In this research work,three kinds of activated bentonite used as solid acid catalysts had been synthesized and studied on removal of olefins from the reformate *** bentonite samples were analyzed using the BET and pyridine-FTIR measurements to investigate their physical and chemical *** results showed that both textural properties and surface acidity of the bentonite could affect the catalytic *** the catalyst samples,one kind of bentonite purchased from Hubei with high surface area,high pore volume and more acid sites revealed high activity in removing olefins from the reformate.

关键词： bentomte N_2 adsorption isotherm pore size distribution acid sites

Preparation and Electrocatalytic Activity of Polyaniline-poly (Propylene Oxide) Modified by Pt Nanoparticles

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Journal of Wuhan university of Technology(materials science) 2006年第4期21卷 9-11页

作者：李美超 College of Chemical engineering and material science State Key Laboratory Breeding Base of Green Chemistry-Synthesis TechnologyZhejiang University of TechnologyHangzhou 310032China

The preparation and electrocatalytic activity of polyaniline-poly （ propylene oxide ）（ PAN-PPO ） modified by Pt particles （ Pt/ PAN-PPO ） were investigated. Pt/ PAN-PPO was characterized by scanning electron microscopy （SEM） and energy dispersive spectroscopy （ EDS ）. Pt particles on PAN-PPO were in the nanometer range, and dispersed in a three-dimensional distribution on the surface of PAN-PPO film. Compared with polyaniline and glassy carbon modified with Pt particles under the same conditions, Pt/PAN-PPO exhibited a high electrocatalytic activity for lysine oxidation.

关键词： aniline propylene oxide copolymer platinum electrocatalytic activity lysine

Synthesis,characterization,structures and magnetic property of chiral oxalate-bridged dicopper(Ⅱ) complexes

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science china Chemistry 2010年第6期53卷 1255-1260页

作者： WU Ling1,WANG Jun2,ZHU CaiFei1,LIN YiJi1,CHEN LeiQi1,FAN Jun2 & ZHANG Hui1 1state Key laboratory of Physical Chemistry of solid Surfaces department of Chemistry,College of Chemistry and Chemical engineering,Xiamen university,Xiamen 361005,china 2School of Chemistry and Environment,South china Normal university,Guangzhou 510006,china state Key laboratory of Physical Chemistry of solid Surfaces department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen China School of Chemistry and Environment South China Normal University Guangzhou China

The oxalato-bridged dicopper(II) complexes [Cu2(μ-ox)(LRR)2(H2O)2(ClO4)2] (1),[Cu2(μ-ox)(LRR)2(CH3COCH3)2(ClO4)2](1a),[Cu2(μ-ox)(LSS)2(H2O)2(ClO4)2] (2) and [Cu2(μ-ox)(LRR)(LSS)2(CH3COCH3)2(ClO4)2] (3) [LRR = (8R,10R)-(-)-[4,5]-pineno2,2′-bipyridine,LSS = (8S,10S)-(+)-[4,5]-pineno-2,2′-bipyridine;ox2= oxalate] were first prepared.A possible mechanism for the formation of the chial dicopper(II) complexes was *** on elemental analysis,conductance measurement,UV-Vis spectra,CD spectra and X-ray single-crystal diffraction,the oxalato-bridged structures of 1 and 2 were deduced to adopt two Cu(II) ions and the bridged oxalate lying in the nearly same *** crystal structures of 1a and 3 reveal that the coordination geometry around each Cu(II) ion is an elongated and distorted octahedron and two axial solvent molecules and two perchlorate ions are anti to each other respectively in both binuclear *** solution CD spectra of 1 and 2 in the visible d-d range show very weak Cotton effects with peaks at 588 and 779 nm,which are approximately of mirror image,suggesting the optical activities may be derived from the vicinal effects of the chiragenic centers at the pinene group of LRR and LSS,*** 1 has been characterized by variable-temperature magnetic susceptibility and the data was least-square fitted to the Blenaey-Bowers *** exchange integral J was found to be -338.41(4) cm-1,indicating a strong antiferromagnetic interaction between two copper(II) ions.

关键词： dicopper(II) complex chiral bipyridine μ-oxalate bridge crystal structure CD spectroscopy magnetic property

Crystallization Growth of Single Crystal Cu by Continuous Casting

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Journal of materials science & Technology 2000年第3期16卷 345-347页

作者： Zhenming XU and Jianguo LI (School of materials science and engineering, Shanghai Jiaotong university, Shanghai 200030, china) Hengzhi FU (state Key laboratory of solidification Processing, Northwestern Polytechnical university, Xi’an 710072, china) School of materials science and engineering Shanghai Jiaotong University Shanghai 200030 China state Key laboratory of solidification Processing Northwestern Polytechnical University Xi'an 710072 China

Crystallization growth of single-crystal Cu by continuous casting has been investigated using self-designed horizontal continuous casting equipment and XRD. Experimental results showed that the crystallization plane of (311), (220) and (ill) were eliminated sequentially in evolutionary process. The final growth plane of crystal was (200), the direction of crystallization was [100], the growth direction of both sides of the rod inclined to axis, and the degree of deviation of direction [100] from the crystal axis was less than 10°. In order to produce high quality single crystal, the solid-liquid interface morphology must be smooth, even be planar.

关键词： Crystallization Growth of Single Crystal Cu by Continuous Casting Cu