bluuebunny/crossref_metadata_2025 huggingface dataset:
The Improvement of Laminar Cooling System for Hot Rolled Strip Base on Rolling Process
Authors: Wang Hai Fang , Ren Xiao Guang , Rong Yu
Published: May 2013

Hot strip cooling temperature and its cooling rate is get by strip cooling system and coiling temperature of hot rolled strip is an important parameter on its performance index. It presents laminar cooling system of the 700 mm hot strip mill and the mill rolling process is present, the laminar cooling system is analyzed on the rolling theory and techniques. The laminar cooling system and its problems are present. The improvement programs of laminar cooling system are present, The control system of laminar cooling system is present combining feed-forward main control and feed-backward self-learning control, and measuring instruments is reinstall and water valves is improved. It could be a reference for the similar mill units and new building rolling mills.
Experimental Research on Acoustic Parameters and Saturation of Gas Hydrate-Bearing Sediments
Authors: Zhang Jian , Ye Yu Guang , Hu Gao Wei
Published: May 2013

It's very important to control the sensors of ultrasonic and Time Domain Reflectometry when study the relationship between gas hydrate saturation and acoustic parameters in sediments. We combined Ultrasonic Wave and Time Domain Reflectometry in one apparatus to study the acoustic parameters of gas hydrate-bearing sediments in different saturation. The experimental results show that the apparatus is well designed and can work smoothly. Subsequently, we compare the calculated data by time-average equation, Woods equation, Lees weighted equation and Biot-Gassmann Theory by Lee (BGTL) with the observed data in experiments. It suggests that the Lees weighted equation and BGTL are more applicable in our experiments and various sediments.
Finite Element Analysis of Contact between Laying Head Pipe and High-Speed Wire Rod
Authors: Liu Chi , Liu Yi Lun , Ma Li Yong , Yuan Pin
Published: May 2013

Wire spinning, which is a deformation process of great complexity in laying head pipe, was simulated using MSC. Marc, a software for finite element analysis, with the aid of production data collected in a high-speed wire spinning production line. The stress condition and the temperature distribution of the laying head inner wall, under the condition of high speed dry sliding friction, were obtained. The effects of different feed speeds on the contact stress and the transient temperature of the easily-wear part were analyzed. The simulation result coincides with the actual wear condition in the laying head pipe, indicating the soundness of the finite element model and making a contribution to optimizing the special curve of the laying head pipe and the finished rolling speed.
Dry Sliding Wear Behavior of Laser Clad WC/NiCrBSi Metal Matrix Composite Coatings
Authors: Yang Jiao Xi , Miao Xuan He
Published: May 2013

Different types of WC/NiCrBSi metal matrix composite coatings were deposited by laser cladding. The wear resistance of these composite coatings was tested with a ring-on-disc (MMG-10) apparatus. The morphologies of the worn surfaces were observed using a scanning electron microscopy (SEM) equipped with an energy dispersive spectroscopy (EDS) for elemental composition. The results showed that the wear resistance of the laser clad WC/Ni-based composite coatings increased significantly with increasing WC mass fraction. It had also been suggested that the composite coating containing 60 wt% agglomerate WC had superior wear resistance property. The wear mechanism was then discussed on the basis of microscopic observations of the worn surfaces.
Preparation of the High Temperature Resisting Material with Al-CrO3 System by SHS
Authors: Wang Yan
Published: May 2013

SHS (Self-propagating High-temperature Synthesis) process is a new method to synthesis materials. The preparation of high temperature and resisting material with Al-CrO3 system was shown in this paper. According to the orthogonal test, a best sample was obtained with high refractoriness reaching 1800 °C and cold crushing strength 20MPa. The SEM analysis was used to analyze the microstructure of the product. The XRD was used to make sure the components of the product. The product has the characteristics of heat insulation, heat insulation and crush resistance, etc.
The Influence of Mixing Enthalpy on the Geometric Properties of Laser Solid Formed Ti-6Al-4V
Authors: Zhang Feng Ying , Tan Hua , Chen Hong , Liang Guang Sheng
Published: May 2013

Ti-6Al-4V alloy samples were deposited by laser solid forming from blended 90wt%Ti+6wt%Al+4wt%V powders and from pre-alloyed Ti-6Al-4V powders under the same processing parameters, and the geometric properties of the deposited samples were studied comparatively. It was found that the height and the width of the deposited layers increased with the increase of the laser power and the decrease of the laser scanning velocity. Meanwhile, the height and the width of the deposited layer obtained from blended elemental powders are much higher than that from pre-alloyed powders. The mixing enthalpy for Ti-6Al-4V was calculated by using the Miedema model and the Toop model, and it was found that the alloying process for Ti, Al and V in the molten pool is exothermic, which is responsible for the higher deposited layer height and width of LSF Ti-6Al-4V from blended elemental powders due to the higher energy in the molten pool and the higher temperature of the molten pool.
Current Progresses of Laser Assisted Machining of Aerospace Materials for Enhancing Tool Life
Authors: Sun Shou Jin , Brandt Milan , Mo John P.T.
Published: May 2013

A higher strength and heat resistance are increasingly demanded from the advanced engineering materials with high temperature applications in the aerospace industry. These properties make machining these materials very difficult because of the high cutting forces, cutting temperature and short tool life present. Laser assisted machining uses a laser beam to heat and soften the workpiece locally in front of the cutting tool. The temperature rise at the shear zone reduces the yield strength and work hardening of the workpiece, which make the plastic deformation of the hard-to-machine materials easier during machining. The state-of-the-art, benefits and challenges in laser assisted machining of metallic materials are summarized in this paper, and the improvement of tool life is discussed in relation to laser power, beam position and machining process parameters.
Analysis of New Features of Beer Packaging Design
Authors: Man Xie
Published: May 2013

Nowadays, as a fast moving consumer good, beer is not male-dominated good anymore. Post 80’s and 90’s generation has crept into it and become a young potential market. In the context of this new market pattern, it calls for urgent consideration and solution to design unique product packaging that can meet visual needs of most young consumers and win huge success of market competition in current situation.
Research & Design of the Multifunctional Landscape Hedge Trimmer
Authors: Meng Yan Mei , Wei Jin , Liang Jian Zhi , Dong Zhen , Qin Chun Wa , Chen Qing Wei
Published: May 2013

This paper presents a multifunctional landscape hedge trimmer. It has 6 degrees of freedom, and it can trim the shape of flat, cylinder, cone, sphere, etc. The controller takes the embedded LINUX ARM9 processor as the core. It has a high-speed real-time online interpolation function, and an error compensation function. With the help of the developed control software it can control the trimming process automatically, making the trimming speed faster and the precision higher, and with its single-person operation feature, it greatly reduces the labor intensity and improves the labor efficiency.
Assessment System of Remaining Life for Bridge Crane Based on the Internet of Things
Authors: Gao Wen Han , Li Ming Fang , Cao Shu Gui , Liu Deng Hui
Published: May 2013

In view of the highly randomness and uncertainty in the working condition of crane, take bridge crane as the research object. Firstly, based on the technology of the internet of things, the load capacity and the number of work cycles would be recorded, and the fatigue stress spectrum would be formed. Secondly, based on the Miners fatigue damage accumulation theory and the rain-flow algorithm, the equivalent stress amplitude would be obtained. Thirdly, curve regression model has been used to characterizing the relationship between the crack propagation and equivalent stress amplitude, and predicting the current crack size. Lastly, taking the predicted value of the crack size into the fracture mechanics formula, and estimated the remaining fatigue life of the bridge crane. The example demonstrated that, it is simple and practical to apply the techniques of the internet of things and the regression forecasting to the data collection and crack size prediction; it not only be able to estimate the remaining fatigue life quickly and accurately, but also be able to overcome the drawback of requiring the initial crack size in the fracture mechanics.
Conceptual Approach for Design, Fabrication and Testing of Indoor Remotely Controlled Airship
Authors: Motiwala Nawaz I. , Khan Irshad Ahmed , Yelve Nitesh P. , Narkhede B.E. , Pant Rajkumar S.
Published: May 2013

This paper gives the detailed and step-wise procedure for designing and fabrication of the indoor remotely controlled Airships. The methodology is a systematic collation of various design approaches and concepts, which were studied during the ongoing design and field trial exercises related to remotely controlled airships at the Lighter-Than-Air Systems Laboratory of IIT Bombay along with some other commercially available airships. A methodology for arriving at the dimensions of fins from static stability conditions along with its attachment on the envelope surface is presented. The paper also focuses on the design, shape and materials used for the envelopes of airships along with the fabrication process of the same. This paper also emphasizes on key design issues related to gondola (fuselage) viz., design, shape and attachment to the envelope.
Design and Experiment of Sinonovacula constricta Purification Bacteria System
Authors: Zhong Wei Fang , Wang Yue Hong , Liu Hong Ying
Published: May 2013

A test platform of purification experiment based on with UV and chlorine dioxide disinfection was established. so as to purify the E. coli in vivo shellfish. Based on achieve UV and chlorine dioxide disinfection purposes in closed recirculation-seawater purification system scheme. Sinonovacula constricta were used as experiment materials for circulating seawater purification sterilization experiments online. The results indicated that the purification system to achieve the purpose of purifying shellfish microorganisms also has the advantage of saving energy and reducing pollution emissions. Based on the rate of change for the evaluation of e.coli, Sinonovacula constricta purified in 8-12 hours. E.coli reached to DB35/575-2004 purification of marine shellfish standard requirements ( 300MPN/100g), product yield is 95~98%.
Optimization of a 17m Catamaran Based on the Resistance Performance
Authors: Wang Da Zheng , Ma Fei , Mei Lei
Published: May 2013

Based on Computational Fluid Dynamics (CFD) method and the wave theory, the analysis of hydrodynamic characteristics is made for a wave-piercing catamaran (WPC) in this paper. The resistances of the WPC with different demi-hull spacing are calculated by use of FLOW-3D, and the relationship of the wave resistance with the demi-hull spacing is also discussed. The comparison of results show that the computational resistance matches the test date well in the design speed. This computational method can predict the coefficient of WPC accurately and can be used as a guidance of WPC initional design and optimization on the demi-hull spacing.
Research on High-Grade Anti-Counterfeiting Scratchcard Invoice Printing Technology and Craft
Authors: Ma Jie , Huang Jun Yan , Wu Shuang Ling , Sun Xin , Gai Ren Lin
Published: May 2013

This paper studies on the technology application and craft of printing process of high-grade anti-counterfeiting scratchcard invoice. The secondary flexographic additional printing process for scratchcard invoice was designed and used; also covering lottery information area printing technology with UV scratchcard ink was applied. This technology is very suitable for the high-grade anti-counterfeiting scratchcard invoice printing process, and can ensure the scratchcard invoice privacy and security, also meet user requirement. This technology provides new ideas for new-style high-grade anti-counterfeiting scratchcard invoice printing and production.
SCA Based Exploratory Evaluation of Weapon Equipment Operational Effectiveness
Authors: Li Zhi Fei , Yuan Hui , Yang Feng
Published: May 2013

Under the condition of system-of-systems combat, the relationships among weapon system, control system and detection system are becoming more and more close, which has brought great challenge to the operational effectiveness evaluation of weapon systems. Inspired by cybernetics, and with the support of the Block-diagram evaluation system, SCA method is applied for operational effectiveness evaluation of a certain weapon system. On the one hand, SCA can deal with the uncertain challenges with different scenario conditions by evaluating the weapon equipment effectiveness in uncertain space. On the other, it can seek the mismatching among sensors, controllers and actuators of enemy, which is propitious to reveal the weakness and optimize the operational alternatives of weapon equipment.
Slip-Resistance Assessment on Different Types of Emery Anti-Slip Strip
Authors: Chen Ching Chung
Published: May 2013

Anti-slip strip was one of the most popular slip-resistant products indoor and outdoor, especially on the ramp. By using anti-slip strip the roughness of floor can be increased, the COF will be increased and the risk of slips and falls will be reduced at the same time. This study wanted to find out the effects of slip-resistance under different particle sizes of steel grit, different floor contamination conditions and different inclined angles while using the emery anti-slip strip. The results demonstrated that the particle size of steel grit used on the emery anti-slip strip has significant influence on the COF. When footwear had no groove under the shoe sole or the groove had been abraded badly, the particle size had to be big enough to perform the function of the anti-slip especially under the floor contamination of glycerol and water. Therefore, the study suggested that the particle size of steel grit used on the emery anti-slip strip should be larger than 500μm to provide fine anti-slip effects.
The Research on the Application of Kansei Engineering in the Product Design
Authors: Liang Ruo Yu , Chen Dong Xiang , Wang Tai Yong , Zhang Xue , Wu Kai Fa , Lin Fu Xu , Xu Xiao Feng , Li Yi Chao
Published: May 2013

According to the related concepts and theory of Kansei Engineering (KE), this paper kansei analyzed the shape of household scales by using AHP (analytic hierarchy process), aiming to conclude the relation between emotional intention and design considerations, and sequentially to provide significant design basis and references for product development. Mathematical methods, such as statistics, were applied to this study, which provided a fresh idea for the early stage research of product design.
The Security and Function Improvement of Suitcase Based on Human Factors Engineering
Authors: Sun Wen Ting , Zhang Ya Hui
Published: May 2013

There are some problems about existing suitcases that should be solved and human factors engineering methodology is very important for suitcases design. In this paper, we use reflective materials, LED lights and so on to enhance the security and functionality of suitcase by human factors engineering ideas. And according to the improved design, we build a model and a real production. Then we evaluate the production satisfaction of people from four aspects by ergonomics.
Variation Analysis for a Manufacturing Stage Based on a Balanced One-Way ANOVA Model
Authors: Zhang Lei , Zhang Zhi Sheng , Zhou Yi Fan , Dai Min , Shi Jin Fei
Published: May 2013

A balanced one-way ANOVA model is proposed to quantify the systematic errors and the random errors in the total part variation at a stage. Moreover, a method of hypothesis testing is presented to determine whether the variable systematic errors exist obviously at a stage based on the proposed model. A journal grinding example is taken to illustrate the proposed methodology.
Weave and Process Design of Monolayer Two-Sided Velvet Fabric
Authors: Qi Yuan Yuan , Zhou Dan , Jin Zi Min , Zhu Yong Xiang
Published: May 2013

Weft pulling weave structure on double segmentation method of two-sided velvet fabric is studied based on single-shuttle loom. Through reasonable weave design, raw materials of warp and weft yarn selection and finishing process, adopting inner pile formed technology of double-cutting process and outer pile formed technology of weft pulling, the monolayer two-sided velvet fabric is developed. That product with comfortable and novel style will broad the application of silk velvet fabric on home textile and clothing and provide certain guiding significant on velvet product development.
The Application of Parstat 2273 Electrochemical Workstation in Corrosion Experiment
Authors: Guo Xiao Fei , Xu Bin , Wang Yue
Published: May 2013

The electrochemical workstation has important role in the electrochemical research. In this paper, the Parstat 2273 workstation was introduced and the main applications in electrochemistry were explained. The Tafel extrapolation was introduced as example to illustrate how to test the corrosion velocity by electrochemical workstation, and the EIS was used to analysis corrosion resistance of different materials. In the actual researching process, Parstat 2273 workstation should develop its further application more effectively.
Gaseous Fluorides Formation Mechanism in the Roasting Process of the Fluorite-Bearing Iron Concentrate
Authors: Wang Yi Ci , Zhang Jian Liang , Wang Jing , Zhang Fang , Luo Guo Ping
Published: May 2013

The gaseous fluorides formation mechanism in the roasting process of the fluorite-bearing iron concentrate was studied by thermodynamic calculation, differential thermal analysis (DTA) and chemical analysis. The results show that fluorine in the fluorite-bearing iron concentrate begins to escape since 400~500°C, and the emission rate of fluorine significantly increases when the temperature is above 1100°C; in the roasting process of fluorite-bearing iron concentrate, SiO2, K2O, Na2O, MgO, Al2O3 in the gangue and water vapor in roasting atmospher react with CaF2 in fluorite to generate such gaseous fluorides as SiF4, KF, NaF, MgF2, AlF3 and HF; with the increase of roasting temperature, the emission rate of fluorine increases obviously; and the water vapor in roasting atmosphere can improve escaping of fluorine.The results provide a theoretical basis for the improvement of roasting technology to reduce fluorine emission in the roasting or sintering process of Baiyanobo iron concentrate.
Study on Comprehensive Utilizations of Certain Complex Paragenic Tin Polymetallic Ore
Authors: Chen Xiao Qing , Yang Jin Zhong , Mao Yi Lin , Yan Wei Ping , Li Cheng Xiu
Published: May 2013

The ore compositions in a certain newly proven tin polymetallic ore are complicated, closely mosaic between different minerals and fine-grained disseminated. The main compositions in the ore exist mostly in the form of sulfide, and are associated partly with oxidized ore. It is difficult to separate each metallic mineral to accept qualified concentrates and ensure higher recovery rates. Aiming at characteristics and occurrences of the ore, the project emphatically selects and contrasts the test flow of selective flotation, partial bulk flotation and flotation-and-gravity-concentration, and uses effective reagent system to control the impurity contents in every concentrate, and strengthen the recovery of associated silver at the same time of producing major metallic minerals. Metallic minerals, including copper, lead, zinc, tin, sulfur and silver, can be fully recovered by adopting combined procedure of selective flotation and gravity concentration, and other associated components in the ore are also recovered comprehensively, so the technology indexes of various products obtained are excellent.
Mechanochemical Activation and Characterization of Low-Medium Grade Phosphorite Ore
Authors: Xing Yu , Gao Hong , Ying Yuan Fang , Qu De Zheng
Published: May 2013

The activation effect of ball-to-powder ratio and activation time on phosphorite ore that takes place in mechanochemical activation has been investigated in present paper, which is carried out in a planetary mill AGO-II. The results show that, particle sizes decreased after activation; the leaching rate of water-soluble P2O5 increased 4.6 percentage as ball-to-powder ratio rose from 8:1 to 40:1; the activated particle of samples has been highly dispersed, while the leaching rate of water-soluble P2O5 reached 10.1% after milling 15 minutes during activation, which was 4 times as high as the un-activated samples. The results show a potential utilization of low-medium grade phosphorite ore with mechanochemical activation directly.
Various Morphology of Hierarchical Pore-Structured Compound: MCM-41/Diatomite and its Adsorption Behavior for Methylene Blue
Authors: Li Fang Fei , Xia Mao Sheng , Jiang Yin Shan
Published: May 2013

Hierarchical porous materials attract considerable attentions due to their interesting structures and superior adsorption capabilities. In this work, a novel macro- and meso-porous hierarchical material, MCM-41/diatomite, has successfully been synthesized from natural diatomite and tetraethoxysilane by basic hydrothermal method. Nitrogen adsorption/desorption isotherms, low angle XRD and SEM analysis were carried out to character the multiple porous structure and morphology of MCM-41/diatomite. The resultant compound displayed high specific surface area (862~1041 m2/g) and macro-meso-porous hierarchical structure. The morphology of MCM-41/diatomite could be various, such as worm-like, grape-like, flocky, and acaleph-like, due to different ratio between TEOS, PEG, and NaOH. Moreover, the results of adsorption experiments show that some of the resultant MCM-41/diatomite display stronger adsorption capabilities than simply mesoporous MCM-41, due to the macro-meso-porous hierarchical structure, which would further extend the application of MCM-41/diatomite as adsorbent and catalyst support.
Experimental Study on Gas Hydrates Dissociation in Sands by Depressurization
Authors: Sun Jian Ye , Ye Yu Guang , Liu Chang Ling , Zhang Jian
Published: May 2013

Depressurization method is a more potential way for gas production from gas hydrates. The behavior of gas hydrates dissociation by depressurization method is observed by the use of an experimental apparatus. The hydrates saturation is tracked by TDR during hydrates decomposition. The decomposition process consist three stages: fast dissociation, stable dissociation and the end. Significantly one of major factors that determine gas production rate by depressurization: degree of depressurization is discussed. t1/2 is used to characterize the hydrates decomposition rate. The greater of degree of depressurization is the faster of the hydrates decomposition rate gets.
The Study of the Factors which Influences the Dissolution Rate of the Halite
Authors: Lu Dong Ling , Jiang Fu Chuan , Wei Chao Shuang , Fan Xue Qin
Published: May 2013

In order to make a research on all the factors which influence the dissolution rate of the rock salt, this article study on how the temperature, concentration of the rock salt solution, the dissolution obliquity, and the velocity influence the rock salt dissolution rate. The experiment shows that, all the factors make strong influences on the dissolution rate as follow: ⑴ when the obliquity is 180°, the dissolution rate is the largest, and the 0°is the smallest. The dissolution rate increases with the increasing of the obliquity. ⑵ the dissolution rate increases with the concentration to the largest and then insoluble in saturation.⑶ the dissolution rate increases with the temperature increase. ⑷At first, the dissolution increases with the velocity of the flow, then decreases to stabilize.⑸ This article also integrates the relationship between the temperature, obliquity, velocity and the dissolution rate, and the research result will play a key role in the production of cavity and the numerical simulation in the production procedure.
Paste Thickening of Iron Tailings with Vibrating Lamella Thickener
Authors: Zhou Xing Long , Xie Qi Chun , Zhang Xiao Ming , Shi Zhi Xin , Tian Chun Qiu , Chen Lu Zheng , Sun Dong Yang
Published: May 2013

Vibrating lamella thickener (VLT) developed by Kunming University of Science and Technology is a new generation of inclined plate settling device, and in this device such long-standing problems in traditional lamella thickener (LT) as material bonding and blockage between channels in inclined plates, material deposits and blockage in cone bucket, as well as unsteady discharging of high solids underflow, etc. are effectively resolved, through periodic vibration of inclined plate modules, the use of built-in device for removal of deposited material on cone wall and of forced discharging device for high solids underflow. Paste discharging is now a new way for the effective treatment of tailings in recent years, due to its superiority for mining safety and environmental protection. The industrial tests for paste thickening of iron tailings were carried out in a mineral processing plant of Mining Co., Ltd. of Panzhihua Iron and Steel Group, using a ZXNQP-32 VLT. In the test the size distribution and settling characteristics of the tailings were analyzed, and the main operating parameters in the VLT were tested under the natural settling and flocculated settling conditions, respectively. The results of test indicate that the solids concentration of underflow from the VLT is capable of reaching higher than 70%; meanwhile, the solids content in overflow from the VLT is as low as less than 300 mg/l while flocculant is added in the ore pulp for pretreatment and such an overflow can be directly discharged into environment or be recycled in the plant. It is thus concluded that VLT is effective for paste thickening of iron tailings.
Morphology and Property of Polypropylene Composites Filled with Modified Attapulgite
Authors: Hu Li Song , Liu Sheng Peng
Published: May 2013

Organified attapulgites (AT) were modified withγ-Amino propyl triethoxysilane ( KH550 ). Then, the modified AT (AT-KH550) and untreated AT particles were compounded with polypropylene (PP) to prepare PP/AT-KH550 and PP/AT composites respectively. The micro-structrue, chemical structure and properties of the composites were also investigated with scanning electron microscopy (SEM), Fourier-transform infrared spectra (FTIR), Differential scanning calorimetry (DSC) and mechanical testing. The FTIR results showed that the KH550 is grafted on the AT particles. The izod impact strength of PP/AT-KH550 composites were improved obviously than those of PP/AT composites. The melting and crystallization temperatures of PP/AT and PP/AT-KH550 composites were increased with the loading of pristine AT and KH550 modified AT particles.
Preparation and Characterization of Hydroxyapatite Whiskers
Authors: Huang Ming Hua , Chen Qing Hua , Cui Yong Shun , Zhu Wei Bo
Published: May 2013

The HAP whiskers were prepared by hydrothermal homogeneous precipitation method at the constant temperature. Diammonium hydrogen phosphate, calcium nitrate tetrahydrate, urea and nitric acid were used as the main raw materials. Sorbitol was selected as the template agent and the hydroxyapatite whiskers seeds were served as the inducers. SEM, TEM, XRD and EDS were applied in characterization. The results show that the reaction products are the HAP whiskers with high crystallinity, smooth appearance and no agglomeration; the obtained HAP whiskers are monocrystal and the length-diameter ratio distribution of the HAP whiskers is concentrated at about 30.
Preparation and Photocatalytic Activity of Gadolinium–Doped ZnO Nanocrystalline Powders
Authors: Chen Li Feng
Published: May 2013

Gadolinium–doped ZnO nanocrystalline powders were prepared by hydrothermal method using ionic liquid (1-heptyl-3-methyl imidazole bromide) as template. The crystal structure, grain size and optical properties of the samples were characterized by X-ray diffractometry, scanning electron microscopy and UV-Vis spectroscopy. The photocatalytic degradation of KN-R dye under simulated sunlight was chosen as a model reaction to evaluate the photocatalytic activities of the undoped and doped ZnO nanocrystalline catalysts. It was shown that Gadolinium was successfully doped into ZnO powders, and thus showing enhanced performance in degradation of KN-R.
A Novel Hybrid System for the Fabrication of Electrospun Mat with Microspheres
Authors: Zhang Sai , Jiang Guo Jun
Published: May 2013

In this paper, we presented a novel system of electrospinning to directly prepare fibrous meshes with micro/nanoparticles. Acetate cellulose (CA) as the material of micro/nanoparticles was dissolved in the mixture of acetone and dichloromethane as well as polyvinyl alcohol (PVA) was dissolved into deionized water, respectively. We successfully fabricated CA microspheres by an oil-in-water (O/W) emulsion/solvent evaporation technique, instilling CA solution into the stirring PVA aqueous solution. Then the hybrid solution was fabricated into a fibrous mat through electrospinning. CA micro/nanoparticles were wrapped in PVA fibers which indicated that the hybrid system of electrospinning had great potential in biomedicine when combing biodegradable microspheres with drugs.
Studies on Crystallizations and Mechanical Properties of Polypropylene/Nano-TiO2 Composites
Authors: Yang Chun Ping , Wu Yu Jiao , Liu Chang Gui
Published: May 2013

The surface features of modified nano-TiO2 were characterized by FI-TR. PP/nano-TiO2 composites were prepared via melt blending. The mechanical properties and crystallization were analyzed by mechanical properties tests, DSC and POM. The results show that filling nano-TiO2 to PP matrix result in the improvements of impact and tensile strength at the same time, and nano-TiO2 plays a role of heterogeneous nucleation so that crystallization grain can be refined, crystallinity and crystallization speed of PP are increased.
Synthesis of Al2O3 Ceramics Matrix Composites by Thermal Explosion under Pressure and Hot Pressing
Authors: Zhao Guo Long , Huang Chuan Zhen , Liu Han Lian , Zou Bin , Zhu Hong Tao , Wang Jun
Published: May 2013

Three kinds of Al2O3 ceramics matrix composites, such as Al2O3-TiB2, Al2O3-SiC and Al2O3-TiC, were prepared by two steps, which were synthesis of the composites by thermal explosion under a pressure of 20MPa and hot pressing of the composites at 1700°C under a pressure of 32MPa respectively. The preparation process, the composition and the microstructure of the composites were investigated in detail. The Gibbs free energy and the adiabatic temperature (Tad) of three exothermic synthesis reactions were calculated. Disc-shaped and elongated TiB2 grains were synthesized in the Al2O3-TiB2 composite. Some whiskers and platelet grains were synthesized in the Al2O3-SiC composite. Nano-particles were synthesized in the Al2O3-TiC composite and distributed both within the Al2O3 matrix grains and along the grain boundaries.
Fabrication of ZrB2-Based Ceramics Doped with ZrSi2
Authors: Li Jian , Wei Z.Q. , Zhang Z.F. , Sha J. J.
Published: May 2013

With the addition of ZrSi2, the highly densified ZrB2-based ceramics were fabricated by hot pressing. The relative density increased with increasing the volume fraction of ZrSi2­and sintering temperature; the Vickers hardness increased with increasing the sintering temperature, but decreased with increasing the volume fraction of ZrSi2­.
Study of Domains and Size Effect of Curie Temperature in BaTiO3 Nanoceramics
Authors: Fang Chao , Chen Liang Yan
Published: May 2013

Domains and size effect of Curie temperature in BaTiO3 nanoceramics has been studied in this paper. We have calculated Coulomb interaction in a single domain of multi-domains BaTiO3 grain, and obtained Curie temperature at various grain size. The results show that along with the grain size decreases, the change of Coulomb interaction depends on type of domains. 90 degree domains cause Coulomb interaction increase and Curie temperature moves to high temperature; 180 degree domains make Coulomb interaction weak and Curie temperature moves to low temperature. The results are compared with experimental data.
Study on Grindability Evaluation of Ceramic Materials Based on Interval Gray Principal Component Analysis
Authors: Xia Ji Mei
Published: May 2013

A new comprehensive evaluation method for grindability of ceramic materials is advanced. The mechanical property parameters of ceramic materials are selected as influencing factors for grindability, the interval sample matrices are established, the interval grey relational coefficient matrices are calculated and the factors weights determined by the eigenvectors. The important degree sequence of influencing factors and comprehensive evaluation value of grindability for ceramic materials are obtained. Seven typical engineering ceramic materials are analyzed using the method, the objective and comprehensive results are gained.
Preparation and Characterization of a Novel Gadolinium Triple-Decker Sandwich-Type Complex with Tetrabenzoporphyrin Ligand
Authors: Liu Qi Feng
Published: May 2013

A novel gadolinium triple-decker sandwich-type complex containing tetrabenzoporphyrin (TBP) ligands-Gd (TBP)3was prepared from porphyrin 1 and Gd (acac)3.nH2O in boiling 1, 2, 4-Tcb for 45~48 h under Ar. Its structure is characterized by Uv-Vis spectroscopy and HR-MS. The spectroscopic properties show that its longest-wavelength visible band (600-800 nm) is obviously red-shifted due to the extension of the π conjugated systems derived from the linear benzoannulation in the TBP ring. The magnetic studies also indicate that there is no magnetic interactions between two Gd (III) ions in the triple-deckers in the range from room temperature down to 20K and very weak antiferromagnetic coupling exists between two Gd (III) ions below 20K.
Ferromagnetic Material of the Nearly Half-Metallic Alloy Co2TiGa
Authors: Han Hong Pei
Published: May 2013

The structure, electronic and magnetic properties of full-Heusler alloy Co2TiGa are investigated by means of the full potential linearized augmented plane-wave method. Our results show that the ground state of Co2TiGa is of the nearly half-metallic ferromagnetism with a magnetic moment of 1.00218μBper unit cell, which are contributed by the atoms Co and Ti. Meanwhile, the spin polarization around the Fermi level is up to 93.2%, almost 100%, which indicates that full-Heusler alloy Co2TiGa with the well magnetism and spin polarization would be possibly applied to the field of the material engineering and information technology.
Structural Stability, Electronic and Optical Properties of Ni-Doped Boron Carbide by First Principles Calculation
Authors: Fan Jian Ling , Wei Yong Sen , Lu Sen Kai
Published: May 2013

The wide band gap, temperature stability, high resistivity, robustness of semiconducting boron carbide make it an attractive material for device applications.. Here the structural stability along with the electronic and the optical properties of Ni-doped boron carbides (B13C2) were studied using the first principle calculations based on plane wave pseudo-potential theory. The calculated results showed that Ni-doped in boron carbide was in preference to substituting C atom on the end of C-B-C chain, but it was difficult for Ni to substitute B atom in the center of the C-B-C chain or in the icosahedron. A representative stable structural unit containing Ni atom was [C-B-Nε+-[B11ε-, while the structural unit without Ni was [C-B-ε--[B12]ε+. The band structure, density of states (DOS) indicated that the coexistence of [C-B-Nε+-[B11ε-structural unit made electrical conductivity increased. Some new impurity energy levels appear in the band gap of Ni-doped B13C2, which can improve the conductivity of B13C2as well. Ni acts as an-type dopant. As the covalent bond of Ni-B was weaker than those of B-B and B-C, the thermal conductivity decreased for Ni-doped B13C2, thermoelectric property of Ni-doped boron carbides has been improved. The imaginary part of the dielectric function of Ni-doped B13C2has three remarkable peaks at 1.13, 3.89, and 6.05 eV. This reveals that doping with Ni can improve the photo-absorption efficiency of B13C2.
Preparation of Stilbene-Eighteen Alkyl Quaternary Ammonium Salts as Fluorescent Brightening Materials and Surfactants
Authors: Wan Mao Sheng , Cao Cheng Bo , Sun Hai Yang , Wang Ming Yang , Ma Wen Qing
Published: May 2013

Three stilbene-eighteen alkyl quaternary ammonium salts were synthesized through three-step reactions. The physical properties of compounds were characterized by UV and fluorescence emission spectra. The new compounds were applied to cotton fiber as fluorescent brightening agents and their performances were evaluated by measuring the degree of whiteness. The surface tension (γ) and the Critical Micelle Concentration (CMC) of compounds were evaluated. The results showed that the three compounds could greatly reduce the surface tension of aqueous solutions.
Electronic Properties of Zno Doped by Rare-Earth Elements from First-Principles
Authors: Chen Lan Li , Hu Hong Duo , Xiong Zhi Hua
Published: May 2013

We perform first-principles calculations to investigate the band structure and density of states of rare-elements doped ZnO. The calculated results show that the shapes of band structures for ZnO by rare-element doping are similar. And the rare-elements incorporation has a little influence on the band gap of the doping system under our considered doping concentration, but after doping, the Fermi level goes into the conduction band, and the electrons from the conduction band minimum to the Fermi level are increasing after rare-earth doping, which means that rare-element doping can change the electrical conductivity of ZnO to a great extent. Meanwhile, it is found that the conduction band near the Fermi level is determined by the rare-element-d states and O-p states, demonstrating as a strong hybridization. This study could provide a theoretical explanation for the factors influencing the properties of ZnO.
Influence of Fe2O3 on the Hydration Resistance of MgO-Al-C Bricks
Authors: Wei Jun Cong , Yuan Su Juan , Ji Xiu Mei , Yu Li Xue , Tu Jun Bo
Published: May 2013

In order to improve the hydration resistance of MgO-Al-C bricks, Fe2O3was chosen as an additive according to thermodynamic calculations. MgO-Al-C refractories were prepared by using Si, Fe2O3or both as additives. The effects of additives on the hydration resistance of specimens were investigated. XRD was conducted to determine the phase composition. The results showed that the hydration resistance of MgO-Al-C bricks would be slightly bettered with addition of only Si. However, it was helpful when Fe2O3was added along with Si. The mechanism is that Fe2O3could decompose to give off oxygen during heating, which could promote the oxidation of Al powder and inhibit the formation of Al4C3and AlN.
Building Energy-Saving Technology and its Application Based on Low Carbon Concept
Authors: Yan Hong
Published: May 2013

With the continuous development of social economy, of residents’living consumption structure upgrade, building energy consumption quantity huge, the increasing focus on research and application of building energy-saving technology. Based on low carbon concept, this paper expounds the necessity of building energy-saving, introducing building envelopes structure energy-saving technology, HVAC systems energy saving technology and new energy utilization technology, analyses the application of building energy-saving about the "Bird's Nest" and the "Water Cube", draw the urgency and the reality of building energy saving technology promotion and application.
Research on Building Low-Carbon Hotels from the Perspective of Circular Economy
Authors: Li Qing , Li Li
Published: May 2013

Low-carbon economy is the only way for China’s economic development, and also an important part of achieving the commitment to the world about reducing 40-45% carbon-emission until the year of 2020. In recent years, the increasing speed of hotels in China has become higher and higher, but most hotels have the problems of serious waste and pollution. This doesn’t benefit for development of low-carbon economy in China. So building low-carbon hotels is imminent at present. From the perspective of circular economy, this paper analyzes the ubiquitous problems in the process of building low-carbon hotels, and then summarizes successful experience of building low-carbon hotels in foreign countries. Finally, the paper put forwards to corresponding countermeasures of building low-carbon hotels from four aspects including policy, technology, culture and behavior.
Study on Particle Characteristics of Cement by Vertical Roller Mill Finish Grinding
Authors: Liu Wei Hua , Bai Rui Ying , Cai Ji Wei
Published: May 2013

The particle characters and their physical properties of vertical roller mill finish grinding cements were studied in this paper. The difference with roller press-ball mill combined grinding products was also analysis. The results were shown that the particle size of the vertical roller mill finish grinding cements was more evenly distributed at the comparative average size. The proportion of the particles under the 3um and on 60um has fallen off a little; the average circularity and slenderness ratio were nearly same with combined grinding process, but the proportion of high circularity particle is lesser, and the particle shape were slightly inferior with the cement produced by combined grinding process; the physical properties were nearly same with the combined grinding cement except the longer setting time. So the cement produced by vertical roller mill finish grinding process is satisfied for the usability requirements.
Study on the Axial Ultimate Bearing Capacity of Concrete-Filled Square Steel Tubular Stub Columns
Authors: Wu Peng , Xu Jian Feng , Zhao Jun Hai , Zhu Qian , Wang Su
Published: May 2013

Based on unified strength theory, the mechanical behavior of core-concrete of concrete-filled square steel tubular stub columns was analyzed. Through controlling the constraint effect between square steel tube and core-concrete by width-thickness ratio, the ultimate bearing capacity formula for concrete-filled square steel tubular stub columns under axial compression was proposed, and the influencing factors of which was also discussed. The rationality of proposed formula was proved from the comparison of the analytical results obtained in this paper and experimental data.
Test Research on Stiffness of Loaded Concrete Beams Strengthened with Prestressed CFRP Sheets
Authors: Cheng Dong Hui , Zhang Peng
Published: May 2013

In order to investigate the mechanical properties of concrete beams strengthened with CFRP sheets under load conditions, according to the reinforcement ratio, three groups of twelve concrete beams were made, each group included an common concrete beam and three prestressed CFRP sheets reinforced beams. Then the test with two-point loading was completed and the test date were obtained. On the basis of the test data, load state of concrete beams strengthened with prestressed CFRP sheets can effectively improve the ultimate bearing capacity, limit crack development and ameliorate the section stiffness.
The Affecting Factors of Slope Stability Based on Orthogonal Design
Authors: Jiang Zhao Rong , Wang Le Hua
Published: May 2013

The orthogonal design can make sites in the test range uniformly distributed, which is introduced to slope sensitivity analysis, and can greatly reduce the test times and gets a good test effect.The paper takes the flood discharging tunnel import slope of Jinchuan hydropower station for example, which is a rock slope. This article selects the bulk density, internal friction angle, cohesion, earthquake acceleration four factors to design the orthogonal experiment, and the safety factor of the slope as a test indicators, using the simplified Bishop method of limit equilibrium theory to calculate the safety factor and analyses the slope sensitivity. The results show that the cohesion and earthquake acceleration are the most sensitive factors, and have a very significant impact on the slope stability.
The Effects of Steel Content for the Mechanics Performance of Fiber Modified Polymer Resin Concrete
Authors: Jin Yu Jie , Xiao Li Guang , Luo Feng
Published: May 2013

In order to analysis the polymer mortar performance, with different steel content polymer mortar specimens by compression tests, bending tests, scanning electron microscopy method, test results indicate that: 3% of the cement dosage and cement dosage compared to 0%，flexural strength of polymer mortar increased 26%, compressive strength increased 6%, fold compression ratio increased accordingly. However, when the dosage is higher than 3%, resulting in large specific surface area of cement, bending strength and compressive strength has declined.
The Inhibition Studying of Many-Doped Mineral Admixture for Concrete Alkali Silicate Reaction
Authors: Zhu Xun Guo , Cao Kai
Published: May 2013

In the theoretical basic of only mixing the pulverized fuel ash, the slag or the silicon ash experiments, carrying on concrete alkali-aggregate reaction experiment separately that double-doped the pulverized fuel ash and the silicon ash, double-doped the pulverized fuel ash and the slag, double-doped the slag and the silicon ash, three-mixed the pulverized fuel ash, the slag and the silicon ash. The result indicated the effect of mixing pulverized fuel ash and the silicon ash is better than the mixing silicon ash and slag or pulverized fuel ash and slag. Besides three-mixed the pulverized fuel ash, the slag and the silicon ash can effectively suppress the reaction of concrete alkali-silica acid response（ASR）
Direct Electrolytic Reduction of Solid Cr2O3 to Cr Using SOM Process
Authors: Chen Chao Yi , Mao Zhi Hui , Li Jun Qi
Published: May 2013

A novel process of solid-oxide-oxygen-ion conducting membrane (SOM) technique has been investigated to produce Cr metal directly from Cr2O3 in molten CaCl2. The sintered porous Cr2O3 pellet was employed as the cathode while liquid copper, saturated with graphite powder and encased in a one-end-closed yttria-stabilized-zirconia (YSZ) tube, acted as the anode. The particle sizes and porosity of the cathode pellets are important factors that have significant impact on the electrolysis process. The optimal experimental condition is pellet forming pressure 4MPa, sintering and electrolytic temperature 1150°C, cell voltage 3.5V, electrolysis time 2h.
Towards a Competitive City: Shanghai's Urban Development
Authors: Li Ze , Zhang Tian Jie
Published: May 2013

This paper investigates Shanghais urban development since 1988 contextualized the series of institutional changes. It examines the rapid urban expansion, and elucidates the large scale and comprehensive re-development within the inner city. The research identifies the transition from government-backed development to property-led development.
Analysis on Characteristics of Ancient Kiln Village in Mengjiajing
Authors: Qu Yu Xuan , Zhu Xiang Dong , Wang Chong En
Published: May 2013

By field research and literature organization for ancient kiln village in Mengjiajing, values and characteristics of the village were analyzed in this paper, which will help people further realize values and characteristics of the village and understand the historic information of protecting ancient kiln village in Mengjiajing.