bluuebunny/crossref_metadata_2025 huggingface dataset:
Growth of a Methane-Utilizing Mixed Culture HD6T on Methanol and Poly-β-Hydroxybutyrate Biosynthesis
Authors: Dong Jing , Xin Jia Ying , Zhang Ying Xin , Chen Lin Lin , Liang Hong Ye , Xia Chun Gu
Published: November 2010

Methane-utilizing mixed culture HD6T was successfully cultivated in a brief non-sterile process using methanol as a sole carbon and energy source for the production of poly-β-hydroxybutyrate(PHB). Shake-flask experiments showed HD6T could grow well in the mineral salt medium with the addition of methanol exposed to the air directly. This non-sterile process and the use of cheap substrates (methanol) can reduce the production costs of PHB. It was found that HD6T grew better and PHB production in a more effective way with an initial liquid methanol concentration of 0.15%(v/v).The lag phase duration, the maximum growth rate, the biomass concentration and the PHB yield, for the optimal conditions were, respectively, 12.03h, 0.04h-1(OD600), 1.54g/l(dry weight), 0.424g/l(dry weight). Methane-utilizing mixed culture HD6T appears to be a promising organism for PHB production.
Effect of Soy Protein on Kinetics of Polyurethane Formation
Authors: Wang Guang Heng
Published: November 2010

The polymerization reaction kinetics of biodegradable polyurethane extended with soy protein isolate (SPI) with dibutyltin dilaurate (DBTDL) as the curing catalyst was studied by means of non-isothermal differential scanning calorimetry (DSC). Model-free methods, Kissinger method and Ozawa method, were applied for analyzing the DSC data. The Ea and lnA obtained from Kissinger method for catalyzed reaction between toluene diisocyanate (TDI) and Polyoxypropyleneglycol (PPG) are 60.80 kJ•mol-1 and 12.09, and for catalyzed reaction among TDI, PPG, and SPI they were 65.91 kJ•mol-1and 14.04. Similarly the Ea obtained from Ozawa method for catalyzed reaction between TDI and PPG and catalyzed reaction among TDI, PPG, and SPI were 63.49 kJ•mol-1 and 64.78 kJ•mol-1, respectively. The results showed that, the incorporation of a small amount of SPI into polyurethane did not affect the reaction kinetic strongly, but increases the reaction activation energy Ea and lnA.
Dynamic Models for L-Histidine Fed-Batch Fermentation by Corynebacterium glutamicum
Authors: Chen Ning , Du Jian Tao , Xie Xi Xian , Xu Qing Yang
Published: November 2010

To predict and control feed batch fermentations of Corynebacterium glutamicun TQ2226 which can produce L-histidine , in this paper , we use a recurrent neural network model(RNNM).The control variables are the limiting substrate and the feeding conditions. The multi-input and multi-output RNNM proposed has seven outputs, nineteen neurons, twelve inputs, in the hidden layer, and global and local feedbacks. The weight update learning algorithm designed is a version of the well known backpropagation through time algorithm directed to the RNNM learning. The RNNM generalization was carried out reproducing a C. glutamicum fermentation not included in the learning process. It attains an error approximation of 1.8%.
Study on the Preparation of Chitosan-Based Resin
Authors: Li Jing Xian , Xue Juan Qin , Wu Ming , Wang Yu Jie , Mao Wei Bo
Published: November 2010

With chitosan as the raw material, a new type of resin material is synthesized through formaldehyde crosslinking. The effects of the reactant ratio, the reaction temperature, the reaction time, the stirring rate and the system pH on the cross-linking rate are studied in detail. The resin material is then characterized by means of IR. The experimental results show that the reaction occurs mainly on the amino and the hydroxyl of chitosan. The chitosan-based resin material with good properties of sphericity and acidresistivity can be prepared under the optimal experimental conditions, which are found to be 1:5 for the ratio of chitosan and formaldehyde, 60°C for the temperature, 1 h for the reaction time, 440r/min for the stirring rate and 10 for the pH.
Competitive Adsorption of Fluoride and Phosphate on MgAl-Co3 Layered Double Hydroxides
Authors: Cai Peng , Zheng Hong , Liang Peng , Liang Shu Ping
Published: November 2010

Competitive adsorption experiment of fluoride and phosphate on MgAl-CO3 LDHs has been conducted. A series of batch experiments were performed to study the influence of various experimental parameters such as pH, adsorbent dosage and contact time on the adsorption of fluoride and phosphate on MgAl-CO3 LDHs. Three kinetic models have been evaluated in order to attempt to fit the experimental data, namely the pseudo-first order, the pseudo-second order and the Weber and Morris intraparticle diffusion model. The effects of the initial concentration and the addition order of fluoride and phosphate on their adsorption by MgAl-CO3 LDHs were also investigated. The results show that the optimal pH is 4 to 5, adsorbent dosage is 2 g/L and it takes about 2 hours to attain equilibrium. It was found that the pseudo-second order most closely describes the kinetics. The initial concentration and the addition order of fluoride and phosphate influence the adsorption of fluoride to a certain extent, but they have relatively small influence to the adsorption of phosphate on MgAl-CO3 LDHs.
Study on Bombardment Energy of Substrate Surface in Sputtering Environment by Langmuir Probe
Authors: Li Hong Tao , Jiang Bai Ling , Yang Bo , Cao Zheng
Published: November 2010

Based on deposition rate of coatings and ion flux measured by Langmuir probe in sputtering environment, bombardment energy Ec1 of sputtered neutral atoms and bombardment energy Ec2 of bombardment ions accepted by substrate surface micro-area per unit time were calculated. The magnitude of Ec1 and Ec2 was approximately the same, surface diffusing processes of the top layer atoms in the coating were accelerated by the simultaneity action of Ec1 and Ec2, bulk diffusion processes of the atoms under the top layer in the coating were promoted by energy accumulation and temperature rise effect caused by the continuance action of Ec1 and Ec2.
The Effect of Heat Treatment Technology on Nonlinear Constitutive Relationship of Metallic Rubber
Authors: Li Yu Yan , Huang Xie Qing
Published: November 2010

In order to solve technological key problem of metallic rubber in the respect of engineering application, based on porous materials theory, this paper explored the method of nonlinear constitutive relationship constructed, thus in view of the effect of heat treatment technology on nonlinear constitutive relationship of metallic rubber, static experiments are made for seven kinds of tempered metallic rubber and seven kinds of untempered metallic rubber, it was found that each coefficient of nonlinear constitutive relationship of tempered metallic rubber was bigger than that of untempered metallic rubber, and the deformation of tempered metallic rubber was smaller than that of untempered metallic rubber. Lastly it concluded that appropriate heat treatment technology could improve mechanical properties of metallic rubber.
Boundary Conditions for Axisymmetric Circular Cylinder of Cubic Quasicrystal
Authors: Zhao Bao Sheng , Gao Yang , Zhao Ying Tao
Published: November 2010

Through generalizing the method of a decay analysis technique determining the interior solution developed by Gregory and Wan, a set of necessary conditions on the end-data of axisymmetric circular cylinder in cubic quasicrystal for the existence of a rapidly decaying solution is established. By accurate solutions for auxiliary regular state, using the reciprocal theorem, these necessary conditions for the end-data to induce only a decaying elastostatic state (boundary layer solution) will be translated into appropriate boundary conditions for the circular cylinder with axisymmetric deformations in cubic quasicrystal. The results of the present paper enable us to establish a set of correct boundary conditions, and mix boundary conditions of which are obtained for the first time.
Research on the Influence Parameter of Thermal Fatigue of the Composites Material SiCp/A356 Used on Brake Disc
Authors: Zhou Su Xia , Zhang Jun Qing , Yang Yue , Xie Ji Long
Published: November 2010

Thermal fatigue tests are carried out to the notch specimens made of particle-reinforced composites entitled SiCp/A356 between 20°C and 300°C. The thermal elastic-plastic finite element method is used to simulate the stress and strain response at the notch root of the thermal fatigue test specimen, and thus the formation mechanism of residual stress is revealed. Then according to the finite element simulation of the stress-strain, the thermal fatigue strain life curves of SiCp/A356 material are given considering the residual stress. This can give the basis for the thermal fatigue properties study of the particle reinforced composite SiCp/A356 used in high-speed train brake disc.
The Study of High-Voltage Insulation Space-Components Applying Resin Composites Modeling Technology
Authors: Hong Ro Bin , Wang Hong Mei
Published: November 2010

High-voltage insulation space-components are critical to the reliability of traveling wave tube amplifiers on satellite. Unlike in atmosphere, high-voltage components working in space can easily discharge due to insulation molding defects, which will lead to failure of amplifiers. We can solve these problems through adopting epoxy resin matrix composites as filler and applying vacuum-pressure injection molding technology for insulated molding process.
Improving Life Cycle Human Toxicity Assessment in Pre-Training Electrolytic Aluminum Industry for Polycyclic Aromatic Hydrocarbons
Authors: Hong Jing Lan , Li Xiang Zhi
Published: November 2010

So far, there are major weaknesses in applying existing life cycle impact assessment characterization models to metals and more specifically to Aluminum-based products, which can lead to biased estimates of damage. To estimate the damage of polycyclic aromatic hydrocarbons (PAHs) in aluminum production sites, this study applies a life cycle assessment for pre-training electrolytic aluminum production in China. Results showed approximately 46% impact of the "average PAHs" was overestimated than existing life cycle impact assessment model (Impact2002+). Results also demonstrated the feasibility and the potential significance of including worker exposure to PAHs. Recommendations are presented to consider and compare both indoor (worker exposure) and outdoor emission of PAHs, differentiating the impact between various PAHs. These improvements are crucial for the future development of impact assessment methods that lead to comparable results between organic and inorganic substances.
The Numerical Simulation and Analysis of New Metal Cold Condole Radiation Panel
Authors: Zheng Li Hong , Ma Li
Published: November 2010

Because of many advantages, radiation panel is a very promising air terminal device now. The paper analyzed the advantages and disadvantages of the existed radiation plate, proposed new radiation panel structure, then made the CFD modeling and flow optimization analysis. This article put forward theoretical analysis and suggest for the research and design of the radiation condole system. This new radiation panel make refrigerant water directly contact with radiation , reduce the contact resistance and increase heat thermal significantly , in addition to simple processing technology reduce the initial investment. Flow is the main factors of heat flow. With increasing of flow, temperature adds more uniform, and increase rate reduced after achieve after turbulence flow. This economic flow of new radiation panel is 1m3/h, heat transfer and energy consumption indicators to achieve optimal.
Study on Thermal Oxidation of Asphalt Fractions by In Situ FTIR Analysis
Authors: Cao Xue Juan , Lei Yun Bo , Wang Wei
Published: November 2010

Base asphalt can be separated into four fractions, which are saturates, naphetene aromatics, polar-aromatics and asphaltenes. The thermal oxidation process of each fraction was studied by in-situ Fourier transform infrared (FTIR) analysis in different atmospheres in this paper. And the results show that each fraction in nitrogen atmosphere has no obvious aging phenomenon, while in oxygen and air atmosphere, only saturates and naphetene aromatics have a drastic change because of thermal oxidation, and polar-aromatics and asphaltenes almost keep unchanged. When adding 2.5% antioxidant 300 or 5% SBS respectively to saturates and naphthene aromatics, it can be found from the results that the degree of thermal oxidation of these two components decrease.
Effect of Chemical Composition on Secondary Hardening of WD1 Steel Used for Warm Work Dies
Authors: Zhao Xin , Yang Xiao Ling
Published: November 2010

A new kind of die steel, WD1 used for warm work dies, was developed. The secondary hardening behavior and its affecting factors were studied. The results show that the secondary hardness increases with the content of C, Mo and V elements and Si element can significantly improve the secondary hardening effect though it’s not one of secondary hardening elements. The hardness of WD1 steel tempered at 520°C is more than HRC60, which can meet the requirements of warm work dies.
Fabrication of Super-Hydrophobic Surface on Aluminum Alloy by a Simple Immersion Method
Authors: Wu Ruo Mei , Liang Shu Quan , Yuan Zhi Qing , Chen Hong , Deng Jing
Published: November 2010

In order to improve the corrosion resistance property of the aluminum alloy surface, a simple chemical immersion method was developed for fabricating the super-hydrophobic surface on aluminum alloy. After treating the chemical etched surface using low surface energy material stearic-acid, the aluminum alloy surface exhibits a super-hydrophobic property with water contact angle of 154° and contact angle hysteresis of 7°. The surface morphology was inspected with scanning electron microscope, and it was found that the surface was configured in a labyrinth structure with convexity and caves of micro-nanostructure; this hierarchical micro-nanostructure plays an important role in the formation of the super-hydrophobic surface. The effects of the etching time and the etchant (potassium permanganate solution) concentration on the super-hydrophobic surface were investigated, and the optimum technical conditions are that etching the aluminum alloy in 0.1mol/L potassium permanganate solution concentration for 3 h. At the same time, we also studied the wettability of the aluminum alloy super-hydrophobic surface. The results showed that the super-hydrophobic aluminum alloy has good stability, corrosion resistance property and self-cleaning.
Effects of Nano-Particles on Resistance of DOP Migration from Flexible PVC
Authors: Li Xi Hong , Xiao Yao , Wang Biao , Lu Ya Qing , Tang Yao , Wang Cheng Jun
Published: November 2010

The effects of nano-particles (CaCO3, SiO2 and organic modified montmorillonite (OMMT) on the suppression of DOP migration from PVC matrix and mechanical properties of PVC composites were evaluated. The results indicated that the three kinds of nano-particles could improve the ability of anti-migration of DOP in flexible PVC. A certain content of nano-particle could decrease the migration rate of DOP. The addition of 5 phr SiO2 decreased the extraction rate of DOP to 15.6%, and SiO2-5/PVC composite film possessed superior anti-extraction property. The introduction of 5 phr OMMT reduced the volatilization of DOP to 0.067%, and OMMT-5/PVC exhibited the lowest volatilization of DOP. Inorganic nano-particles with high surface energy were easy to aggregate, and the influences of aggregation on the properties of composites were clearly detrimental, which results in a drastic decrease of polymer anti-migration and mechanical performance.
Effects of Heat Treatment on the Morphology of Primary α Phase and Hardness of B-Refined Al-7 wt% Si Alloy
Authors: Li Xiao Song , Cai An Hui , Chen Hua , Zeng Ji Jie , Zhou Yong
Published: November 2010

The effects of heat treatment on morphology of primary α and hardness of B-refined Al-7 wt% Si alloy are investigated. In addition, the optimum heat treatment procedure is also determined. It is shown that, at 450°C with different holding time from 3h to 12h, morphology of primary α phase is converted from irregular dendrite to granular homogeneous equiaxed grains then to rosette structure. The primary α phase is gradually converted from dendrite into the rosette dendrite and then into particle crystal with increasing of temperature by holding 8h at 300~540°C. One can find fine and uniform distributed particle α phase at 400°C or 450°C. However, the primary α phase has changed into large and irregular shape when the temperature increases up to 450°C. The orthogonal analysis shows that the optimum heat treatment parameters are 540±10°Cand 6h.
Microstructural Evolution in Void Coalescence Induced by Plate-Impact Loading in Ultrapure Aluminum
Authors: Fan Duan , Qi Mei Lan
Published: November 2010

The evolution of microstructure and the mechanical response of ultrapure aluminum subjected to plastic deformation using plate-impact loading was investigated. For the High Purity Aluminum (99.999%), disk sample was shock impacted by a light gun. Observations by transmission electron microscopy reveal that the inside of the early voids consists of nanometer aluminum; it is proposed that they are the result of recrystallization occurring during localization. And some texture may come from the high temperature annealing the secondary grain crystallization behavior and crystallization when the tensile stress effect. This discovery is helpful to the study on the mechanism during the early stage of void nucleation and growth which produced by tensile fracture.
Module Partition Research for the Marine Drilling Rig
Authors: Feng Ding , Yang Cheng , Xiao Ao , Ruan Chao , Zhang Hong
Published: November 2010

The modular design principle is that much more products are composed by fewness module, and the products should be stable, and have high precision, simple structure, and also lower cost based on the customer requirements, therefore, dividing and treating the level, size and number of the module scientifically and reasonably is an important guarantee for the successful modular design. And now the modular design based on the different thought, for the marine work-over rig, and scientifically rational module partition scheme are offered based on the principle and theory of the module design and module division, which has important significance for the design and development of the module rig.
Heat Transfer Model of Roller Quench in Strip Continuous Heat Treatment Process
Authors: Dou Rui Feng , Wen Zhi , Liu Xun Liang , Lou Guo Feng
Published: November 2010

Roller quench is a rapid cooling technique used in strip continuous heat-treatment process, which is one of the most important processes in producing cold-rolled strip steel. Heat transports by contact heat transfer in roller quench, for the complex characteristics of contact heat transfer, roller quench is very difficulty to simulate. In this paper a roller quench heat transfer model is build based on Fourier-Kirchhoff differential equations. A new correlation function of contact conductance is developed from statistical mechanics model results by least square method. This correlation function solves the heat transfer boundary condition in contact region between strip and roller. In this model the contact radiation is also considered. The roller quench model predicts the heat transfer characteristics of roller quench. The model is useful for the designing and controlling of the roller quench system.
Study on Variation Rule of Pore Pressure on CPTU Model Test
Authors: Tang Yan Chun , Meng Gao Tou
Published: November 2010

Through a series of Piezocone Penetration Test (CPTU) model tests with saturated clay soil, excess pore pressure produced by CPTU penetrating and dissipating has been measured by CPTU probe and pore pressure mini-transducers, the variation rules of excess pore pressure has been analyzed, the results show that at the same transducers layer, the value of initial excess pore pressure at the probe is biggest, and with the horizontal distance from probe increasing, the value of initial excess pore pressure measured by transducers around the probe has been decreased quickly; at the same dissipating process, the value of initial excess pore pressure measured by transducers locating in the same horizontal plane with probe is bigger than the value by transducers of the other layer; difference between the variation rule of excess pore pressure dissipation measured by CPTU probe and pore pressure mini-transducers is that after the value of excess pore pressure is maximum, with the dissipating time increasing, the value of excess pore pressure measured by probe decreased rapidly, but at first the value of excess pore pressure measured by transducers decreased slowly and then after a short time decreased rapidly; the time of 90% of the maximum of excess pore pressure dissipating measured by CPTU probe is longer than the time of 90% of the maximum of excess pore pressure dissipating measured by transducers; at the same transducers layer, with horizontal distance from the probe increasing, the time of 90% of the maximum of excess pore pressure dissipating decreased. The achieved result can provide a foundation for further study for CPTU mechanism.
Concrete Structure System Based on Stay in Place Formwork
Authors: Wang Li Jiu , Gu Xin , Sun Dan
Published: November 2010

The utilization of stay in place formwork in concrete structure has received considerable attention in recent years. It is comparatively low labor intensity, readily available and has a range of attractive properties and characteristics that makes it suitable for a variety of building and construction applications. The fabrication and seismic behavior was studied in this paper. The experiments have shown that sufficient data have been obtained to give confidence in the reinforcing mechanism of stay in place construction formwork, and future work need only be focused on formwork design and standardization.
Ab Initio Study on Ta:SnO2
Authors: Qin Guo Qiang , Zhang Guang Lei , Liu Shi Min , Fu Hua , Wen Jing
Published: November 2010

The structural, electronic and optical properties of a tantalum doped rutile-phased stannic oxide were investigated by ab initio calculations. The Ta dopant doesn’t change the lattice symmetry of rutile phase, but brings about a smaller volume expansion comparing with Sb:SnO2, a increase in thermal stability, a semiconductor-metal transition in electronic structure and a red shift in the optical spectrum. The intra-band excitation caused by Ta dopant leads to to a remarkable enhancement of optical peaks in the infrared region, while the stability of optical spectrum in the visible light region supports the preservation of high visible transparency of Ta:SnO2 with dopant concentration as high as 4.17 at.%.
Spectral Investigation of Bolaform Schiff Bases with Barbituric Acid
Authors: Jiao Ti Feng , Zhou Juan , Huang Li Kui , Zhou Jing Xin
Published: November 2010

In order to investigate the supramolecular assembly and intermolecular hydrogen bonding of special amphiphiles, two bolaform amphiphilic Schiff bases (GN1 and GN2) with different hydrophilic spacers were designed, and their supramolecular assembly and interaction properties were investigated by spectral measurements. It was found that both the Schiff bases showed hydrogen bonding interaction with barbituric acid. In addition, it was interesting to note that the spacer groups of the molecules had effect on the molecular ratio in the hydrogen-bonded complexes. Due to the directionality and strong matching of hydrogen bond, one barbituric acid molecule can be encapsulated into the intramolecular area of GN1, while two barbituric acid molecules were trapped into the GN2 molecule through intermolecular H-bonds for GN2 due to the long spacer and flexible structure. A rational complex mode was proposed.
Experimental Investigation on Dynamic Constitutive Model of Saturated Sandy Pebble Soil
Authors: Guo Wen , Liu Ke Qi , Yao Hua Chuan
Published: November 2010

The dynamic constitutive model could show the dynamic characteristics of soil, so it was essential in ground motion in earthquake safety evaluation and seismic response analysis of soil, and it had great influence on research and analysis of seismic performance of soil and the stability of the foundation. Sandy pebble soil distributed abroad in Sichuan, so it was widely used in engineering construction. Based on the test results of dynamic triaxial non-drain consolidation test，this paper studied the dynamic constitutive model of saturated sandy pebble soil to provide reference for the future use.
The Lamellar Eutectic Spacing Changes under the High Magnetic Field during the Diffusion of Liquid Al/Solid Cu Process
Authors: Xu Bo , Tong Wei Ping , Kang Tian You , Zuo Liang , He Ji Cheng
Published: November 2010

The effect of a high magnetic field (up to 12T) on the lamellar eutectic spacing changes was investigated in the diffusion liquid Al/solid Cu. It was found that the lamellar eutectic alloy is formed in the diffusion process and its spacing has the non-monotonic relationship with the magnetic field intensity. With the increase of magnetic field intensity, the lamellar eutectic spacing decreases rapidly. When the magnetic field intensity B exceeds 4T, the lamellar eutectic spacing begins to increase until 8T, and then, decrease again. This phenomenon could be attributed to the effects of high magnetic fields suppressing nature convection and inducing thermo-electromagnetic convection in the liquid Al.
The Analysis of Fracture Properties of Steel Column Base
Authors: Gao Yu Bo , Yao Yong , Cheng Xiao Wei , Lei Jin Song , Chu Yun Peng
Published: November 2010

The design of steel column base plays a very important role in steel structure design. Through large-scale analysis software ANSYS, this paper analyzes the steel column base by finite element numerical simulation analysis,and discuss the fracture behavior of steel pipe column and fillet weld in different thickness, axial compression ratio and different sectional area. The results showed that, the section of most likely break focus on the ends and in the middle of the steel pipe column and fillet weld,and with the increase of thickness, cracking capability of the steel pipe column and fillet weld first increased and then decreased, and axial compression ratio of the specimen has little effect for cracking capability,and with the increase of sectional area, the less prone to fracture of the steel pipe column and fillet weld.
Analysis of the Ring-Closing of Chloride Polyether Polyol by the Method of Quantum Chemical Calculating
Authors: Li Jian , Yu Xun Zhang , Zhang Kai
Published: November 2010

The ring-closing reaction of chloride polyether polyol was calculated by Gaussian03 software. The Density Function Theory (DFT) method were employed to study the geometry structures of chloride polyether polyol and the product was obtained on the base of B3LYP/6-31G+ model in this paper. The transitional states (Ts1, Ts2) during the ring-closing process were found by TS method and the energy changing of the system was proved by IRC calculation. Results showed that the ring-closing of chloride polyether polyol had two transition states: hydrogen transferring and the formation of new carbon-oxygen bond. The total energy of reactants was -1459.99627a.u and product is -1460.31170 a.u. The energy of the system was reduced by 175.47621kJ/mol. The ring-closing of chloride polyether polyol was exothermic and stable in thermodynamics.
Effect of Fiber Lay-Up Direction Misalignment on the Natural Frequency of Composite Laminates
Authors: Feng Zhen Yu , Chen Zhao Chen , Hu Jie Wen , Yang Qian , Zou Tian Chun
Published: November 2010

With the extensive use of composite materials in aviation industry, the research of factors which affect their basic performances in production and usage has become very important. In this paper, a finite element analysis model is built by the commercial software MSC.Nastran / Patran to research the effect of fiber lay-up direction misalignment on the natural frequency of composite laminates. The results show that, in the same boundary conditions, stacking sequence has a significant impact on the natural frequencies and vibration modes of composite laminates, and in the lay-up process, the natural frequency change of laminates caused by 0° fiber lay-up direction misalignment is much larger than the natural frequency change of laminates due to 90° fiber lay-up direction misalignment. In the process control and certification of composite laminate plates lay-up, special attention should be taken to the inspection of 0° direction fibers.
Analysis of Forming Defects and Measures to Prevent Forming Defects of Dn40-Type Control Valve
Authors: Fu Xiu Juan , Liu Hong Xia
Published: November 2010

The insufficient filling and shrinkage are often produced in the process of injection molding. These defects cause the production efficiency to reduce and production cost to rise. In this paper, the forming process of Dn40-type control valve is analyzed to find the main reason for such forming defects by using CAE tools and comparing with the good forming process of a Dn50-type control valve. Results show that big difference between wall thicknesses and bad exhaust system in injection mold is the main reasons for insufficient filling. In the meantime, measures to prevent defects are investigated. Modifying the local structure of the injection mold is provided to avoid the defects. Using reasonable parameters in the injecting process and modified injection mold, the injection product have a smooth surface and good forming. The experiment verified the feasibility of the measure for prevention of defects.
Effect of the Additives on the Catalytic Performance of Iron-Ruthenium Composite Catalyst
Authors: Tang Qing Jie , Fan Shao , Liu Bo
Published: November 2010

A series of Iron-Ruthenium composite catalyst were prepared by precipitation and immersion, the effect of potassium and copper were studied by the slurry bed reactor at 260°C、2MPa、CO／H2＝1∶1，and the reduction behavior of Iron-Ruthenium composite catalyst was studied by TPR. The experimental results showed that the performance of Iron-Ruthenium composite catalyst was better than single Iron-based catalyst. The addition of potassium and copper caused the catalytic performance of Iron-Ruthenium composite catalyst improve significantly, and Copper could improve significantly reduction effect on Iron-Ruthenium composite catalyst.
Analysis of Impact on the Wafer Surface Performance of Supercritical CO2 Extraction
Authors: Han Ru Bing
Published: November 2010

The surface of the wafer is easy to be polluted by the organic pollution material. The supercritical fluid extraction technology works well in extracting organic pollution material. Whether the extraction process influences the surface performance of the wafer can be determined through the SEM(scanning electron microscope), AFM (atomic force microscope), and XPS (X-ray photoelectron spectroscopy). Compare the feature and the electronic structure of the wafer before and after supercritical CO2 extraction to get how supercritical CO2 extraction process influences the wafer surface performance. The conclusion helps to determine whether the extraction technology can be applied in the wafer surface cleaning technology. Tests show that supercritical CO2 extraction process almost does not influence the surface performance of the wafer, and, the supercritical CO2 extraction technology has a good prospect in the wafer cleaning.
White and Red Electroluminescence from a Single Copolymers of Fluorene and 4-Thienyl-2,1,3-Benzothiadiazole
Authors: Hou Qiong , Hou Lin Tao , Luo Jie , Li Nai Yuan , Zhu Hong , Shi Guang
Published: November 2010

We have developed efficient pure white- and red-light-emitting polymers through incorporating of low-band gap orange-light-emitting 4-thienyl-2,1,3-benzothiadiazole (BTT) moieties into the backbone of a blue-light-emitting poly(9,9-dioctylfluorene) (PFO). Partial or complete energy transfer from the blue electroluminescent PFO backbone to the orange- light-emitting unit occurred by carefully controlling the relative content of the low-band gap unit BTT in the resulting polymers. Pure white- and red-light electroluminescence from a single polymer has been obtained in a device with a configuration of ITO/PEDOT:PSS/polymer/Ca/Al. The highest external quantum efficiency is 2.4% with luminous efficiency 2.20 cd/A at the luminance of 793 cd/m2 for the red-light emitting copolymer PFO-BTT with emission peak at 607 nm for 15mol% BTT content, the highest external quantum efficiency is 0.5% at the luminance of 81 cd/m2 for the white emitting polymer with color coordinates (0.34, 0.34) very close to the CIE coordinates for National Television System Committee (NTSC) standard white-light emission (0.33,0.33).
Anti-Flushing Design for Continuous Circulation System
Authors: Feng Ding , Li Liu , Tang Hai Xiong
Published: November 2010

Proper wellbore pressure management is a critical part of the drilling practice, where static and dynamic fluid pressures are used to contain formation pressures and assure wellbore stability, to solve the problem; the anti-flushing device is has been developed. The anti-flushing device is designed to counter downhole pressure increase due to safety of narrow mud window and the key to fast drilling. Reasonable control anti-flushing device is the best way to solve the safety of narrow mud window and the key to fast drilling. This paper describes the anti-flushing device, which is run as an integral part of the drill string. The anti-flushing device has been built to operate the 8-1/2 "section of well drilling, keeping continuous loop, To avoiding annular cutting is sank into accumulation when the drill string were connected and the pump stopped, cleaning the small hole by maximum.
Preparation and Recognition Properties of Andrographolide Molecularly Imprinted Ploymer Microspheres
Authors: Yin Xiao Ying , Shan Liu Qing , Han Xiu Lin , Luo Yong Ming
Published: November 2010

Molecular imprinted polymer micrcosheres (MIPMs) were prepared through precipitation polymerization by andrographolide using as the template molecule. The morphologies of synthesized MIPMs were characterized by scanning electronmicroscope (SEM). Systematic investigations of the influences of key synthetic conditions, including functional monomers, cross-linkers and porogens, on the morphologies, yields and the recognition properties of the MIPs were conducted. The results indicated that the morphologies of MIPs with DVB as cross-linker was perfect, but their binding affinity is lower than that of MIPs with TRIM or EDMA as cross-linkers. And particle size of MIPs with TRIM as cross-linkers is small but with high binding affinity. Scatchard analysis revealed that the homogeneous binding sites were formed in the polymers. The application of MIPs with high affinity and excellent stereo-selectivity toward andrographolide in solid-phase extraction (SPE) column might offer a novel method for the enrichment and determination of terpenoids compounds in the traditional herbal medicine.
Suspension Stability and Thermal Conductivity of Oxide Based Nanofluids with Low Volume Concentration
Authors: Zhao Wei Lin , Zhu Bao Jie , Li Jin Kai , Guan Yan Xiang , Li Dong Dong
Published: November 2010

Nanofluid is a new class of heat transfer fluid which contains suspended metallic or nonmetallic nanoparticles in traditional fluid. In this paper, nanofluids containing low volume concentrations (0.1-0.5vol.%) of Al2O3 and SiO2 nanoparticles were produced using a two-step method with ultrasonication and without any surfactant. Suspension stability of nanofluid was characterized and analyzed using zeta potential, average particle size and absorbancy method. The KD2-pro thermal property meter was used to measure the thermal conductivities of Al2O3(40nm)-water and SiO2(30nm)-water nanofluids at different volume concentrations (0.1-0.5vol.%) and temperature(25-50°C). The results show that adding nanoparticles into base fluid can enhance the thermal conductivity greatly. Furthermore, it is also show that the thermal conductivities increase nearly linearly with the nanoparticle volume concentration increasing, and increase significantly with the temperature increasing. A model of thermal conductivity of nanofluid, which has a much better precision, was proposed. But the values of the model are lower than the measured thermal conductivities.
FEM Simulation and Analysis of Variable Parameters for the Three-Roll Cylindrical Bending of Plate Process
Authors: Hao Jian , Luo Zhen , Dong Jian Tao , Zhang J.W.
Published: November 2010

A three-dimensional model is developed to study the dynamic process of three-roll plate bending using finite element method (FEM). In this work, the continuous three-roll bending configuration with cylindrical rolls is used to bend a thick plate into a cylindrical shape. It presents the geometrical setup and the finite element model. This 3D simulation is based on the elastic plastic explicit dynamic FEM under the ANSYS/LS-DYNA environment. Effect of initial strain and change of material properties during deformation is neglected. In order to investigate the influence of parameters on the process, top roller position, friction between rolls and plate, and temperature are also discussed. It is found that the simulation program is a feasible and economical method to study the influence of these parameters, and the FEM simulation can also provide engineers with a convenient analytical tool for optimizing process parameters.
Study of Foamed Concrete from Activated Ash/Slag Blended Cement
Authors: Zhao Feng Qing , Liu Jun Qin , Li Qian , Li Hao
Published: November 2010

An ecotype of foamed concrete was prepared from activated fly ash/slag blended cement, a kind of low carbon cement, through physical foaming and hydrothermal curing process. The optimized material proportion and curing conditions were obtained with the aid of orthogonal array technique: activated fly ash/slag blended cement-600 kg and foaming agent-1kg for per cubic meter formed concrete, curing at 60°C for 6 hours. The density and compressive strength of the foamed concrete prepared in this method were 644kg/m3 and 4.5MP respectively, and with lower drying shrinkage and thermal conductivity, good freezing and thawing characteristics.
Optimum Design of the Launch Vehicle Composite Cross Beam Structure Based on Equivalent Model
Authors: Wang Wei , Wang Zhi Jin
Published: November 2010

The iterative optimization method of using equivalent model is used to design launch vehicle payload bearing structure—composite cross beam. The strategy is based on the idea of the substitution of equivalent models for detailed models. Using the engineering software Patran/Nastran, optimization finds geometry of cross-sectional with a minimum weight and stacking sequences satisfying laminate design rules. Equivalent model method can decrease numbers of design variable as well as ensures reliability of result. The strategy showed weight savings of 38% compared with the initial design with little computational effort. This has demonstrated that the strategy appears efficient, reliable and extendable into the cross beam structure.
Evaluation and Prediction of Dynamic Moisture Comfort Property of Fine Denier Fiber Fabric
Authors: Yang Kai , Jiao Ming Li , Zhang Wei Yuan
Published: November 2010

Fine denier fiber fabric has unique wicking effect and good hydrophobic property, which can keep dry and moisture comfortable when people are in heavy and continued sweat. This paper studied the dynamic moisture comfort property of fine denier fiber fabric compared with conventional fiber fabrics. Firstly, a series of experiments was performed on studying the dynamic moisture transferring procedure and evaluating moisture comfort property of fine denier fiber fabrics in two different environmental conditions, which were the most comfortable condition and an extremely uncomfortable condition for humans. Then, by measuring the real time changes of relative humidity in inner and outer surfaces of test fabrics, fabrics’ dynamic comprehensive index was obtained to characterize fabrics’ dynamic moisture comfort property. Finally, grey system theory was introduced to establish prediction models that could describe the relationship between fabric’s static parameters and dynamic comprehensive index. Results show that fine denier fiber fabric has better moisture comfort property than conventional fiber fabrics.
Structure and Composition Study of InSb Films Prepared by Radio-Frequency Sputtering
Authors: Yao Yan Ping , Liu Chun Ling , Qi Hai Dong , Chang Xi , Wang Chun Wu
Published: November 2010

We present a systematic study of the effect of the sputtering parameters on the structure and composition of InSb film. The effect of the sputtering parameters on the crystallographic structure of InSb films is discussed in terms of the kinetic energy of the particle bombarding the growing film. Measurements of the chemical composition show that In to Sb concentration ratio increases with the increase of working pressure because Sb atoms are more rapidly thermalized by collisions with argon atoms during the transport process of the sputtered atoms. And the composition of the films is governed by the Sb re-evaporation process at the surface of the growing films. In to Sb concentration ratio is enhanced by increasing the substrate temperature (essentially) or RF power.
The Damping Energy Dissipation Study on Buckling Restrained Brace in Multilayer Steel Frame
Authors: Chu Yun Peng , Yao Yong , Xu Bin , Deng Yong Jun , Xiao Shu Lian
Published: November 2010

The buckling-restrained brace has stable energy dissipation capability. It has been widely used in recent years. This paper uses finite element software ANSYS to do non-linear time history analysis for Center Braced Steel Frame, Eccentrically Braced Steel Frame, Buckling-restrained Braced Steel Frame under the earthquake. The results show that: (1) The peak acceleration, residual displacement and top floor displacement of buckling-restrained braced steel frame is smaller than the other two brace frames, provide support for the structure stability. (2) The damping energy and bracing energy dissipation capability of buckling-restrained braces and eccentrically braced are strong, so it can avoid the collapse of the main structure under the large or medium earthquake.
Microstructure and Mechanical Properties of Vacuum Sintered Austenitic Stainless Steel Parts
Authors: Lin Shao Jiang , Feng Da Peng , Shi Qi Nian
Published: November 2010

This work presents the possibility of obtaining high density austenitic stainless steel parts by powder metallurgy (PM) and sintered in vacuum. Mechanical properties such as tensile strength, yield stress, elongation rate and Vickers hardness were measured by using a tensile testing machine and a Vickers hardness tester at room temperature. Microstructural characterization was performed by means of optical microscopy and scanning electron microscopy (SEM). The effect of sintering temperature on densification and mechanical properties of PM austenitic stainless steel has been investigated. The results show that density and mechanical properties were increased with the increase of sintering temperature, but when the sintering temperature is above 1340 °C, they increased slowly. The highest mechanical properties were obtained when sintering temperature was 1340 °C.
Study on the Toxicity of Cyanogen-Containing Industrial Waste Residues
Authors: Liu Jin , Jiao Bin Quan , Li Dong Wei
Published: November 2010

By using a series of tests for corrosivity, acute toxicity and leaching toxicity of cyanide-containing wasteresidues, the toxicity of cyanide-containing wasteresidues has been investigated. According to acute toxicity test, the wasteresidues showed no acute toxicity. The experiment further indicated that the cyanide compounds were tested in the 0.15 ～ 0.60 concentration rang, mean (0.429), standard deviation (0.195) and variation coefficient (45.5%). The pH value range for leaching liquor of slag yard was 9.21～13.09 at the mean 10864, and the standard deviation and variation coefficient were 1.553 and 14.3% respectively. The research revealed that the cyanide compounds content in wasteresidue samples was distributed very unevenly, and the content of cyanide compounds was not exceeded the standard. Based on the current analysis results, those cyanide-containing wasteresidues were defined as hazardous solidwastes with corrosivity.
Flow Control over a Circular-Cone-Cylinder by Unsteady Plasma Actuations
Authors: Hao Jiang Nan , Gao Chao , Li Yin Zhe
Published: November 2010

An experimental study of plasma duty-cycled actuation over slender forebodies is performed on a 20° circular-cone-cylinder model using a pair of Single Dielectric Barrier Discharge (SDBD) plasma actuators near the cone apex combined with a duty-cycle technique. The tests are carried out in a low-turbulence 3.0 m ×1.6 m low-speed wind tunnel at an angle of attack of 45°. The Reynolds number based on the cone base diameter is 50, 000. The frequency of the duty cycle is 10 Hz. The mechanisms of the unsteady excitations over various duty cycles of frequency 10 Hz are studied using ten Kulite pressure transducers mounted around a cross section of the cone forebody at angle of attack of 45°.The circumferential pressure distributions over a station on the cone forebody is measured by unsteady pressure tappings, Phase-locked averaged pressures are studied and compared with ensemble-averaged pressures.
Synthesis and Microwave Absorbing Properties of Ni/SiO2 Core/Shell Particles
Authors: Wang Bo Chong , Wang Tao , Qiao Liang , Li Fa Shen
Published: November 2010

In this paper, we report on the microwave absorbing properties of the Ni/SiO2 core/shell soft magnetic material which was synthesized by the tetraethyl orthosilicate (TEOS) hydrolysis method. The SEM patterns were shown that the particles of Ni/SiO2 were more dispersed and homogeneous. Microwave absorbing properties were measured in the range of 0.1–18 GHz. A reflection loss (RL) exceeding −20 dB in the frequency range of 2.6–8.9 GHz was achieved for an absorber thickness of 2.0–5.6 mm, and an optimal RL of −49.5 dB was obtained at 4.4 GHz for the thickness of 3.5 mm. The good microwave absorption properties resulted from a proper impedance match as a consequence of the insulator SiO2 around Ni particles.
Electromagnetic Properties of Silica-Coated Planar Anisotropy Carbonyl-Iron Particles in Quasimicrowave Band
Authors: Han Rui , Han Xiang Hua , Qiao Liang , Wang Tao , Li Fa Shen
Published: November 2010

For the sake of thinner electromagnetic wave absorbers used in quasimicrowave band, planar anisotropy carbonyl-iron (PACI) coated with amorphous SiO2 particles as absorber and paraffin as matrix were prepared. The complex permeability, complex permittivity and microwave absorption properties were investigated in the frequency range of 0.1-18 GHz. Both the real parts of permeability and permittivity are increased with the increasing of PACI/SiO2 particles volume concentrations. The minimum reflection loss shifts to the low frequency region with increase in PACI/SiO2 particles volume concentrations. The decrease of matching frequency could be well explained by the increasing of and . The PACI/SiO2 core-shell material exhibits great potential in application absorbers in quasimicrowave frequency range.