bluuebunny/crossref_metadata_2025 huggingface dataset:
A Solar Cell Based on a Hybrid Film of P3HT and Magic Cubic-Like PbS
Authors: Wang Peng , Wang An Mei , Zhang Zhen Hua , Fan Li Bo , Lei Yan , Yang Meng Yuan , Zhang Yan Ge , Li Pin Jiang
Published: September 2012

Lead sulfide (PbS) magic cubes were prepared by a simple hydrothermal method without any organic solvent. The product was characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM) and absorption spectrum. A solar cell, with a structure of Al/P3HT:PbS/PEDOT:PSS/ITO/Glass, was made. By a spin coating method, a hybrid film of poly(3-hexylthiophene) (P3HT) and PbS was prepared on the PEDOT:PSS layer. The solar cells are photosensitive in a large spectral range (visible and near infrared regions). The cells, with the area of 0.15 cm2 without any special treatment, have shown the values of open-circuit voltage (Voc) of 242 mV, short circuit current (Jsc) of 0.01 mA/cm2, energy conversion efficiency (η) of 0.01 % and fill factor (FF) of 0.31 under illumination intensity of 100 mW/cm2.
Carbide Distribution Effect on Wear Behavior of Cold Work Tool Steels
Authors: Chiu Liu Ho , Liao Huan Chen , Lin Shou Chi , Pan Yeong Tsuen , Liou Horng Yih
Published: September 2012

The carbide distribution and retained austenite effects in cold work tool steels on their wear behavior are studied using different quenching, tempering and cryogenic processes. Treated specimens were characterized using optical and scanning electron microscopy, hardness measurements, X-ray diffraction as well as wear tests in a block-on-roller method without lubrication. Beside primary carbides being large and non-uniformly distributed in the D2-B specimen, the weight losses of the D2-B specimen (62.4 HRC) quenched and tempered at 200°C was highest among all tested specimens due to substantial retained austenite in the tempered martensite matrix. With the aid of small and uniform dispersed carbides, the DC53 steel specimen (61.3 HRC) showed less weight loss and exhibited the best wear resistance. The weight loss from cryogenically treated specimens was lower than that of non-cryogenically treated one.
Construction of Flow Stress Constitutive Equation for 3Cr1Mo0.25V Steel
Authors: Zhang Yu Hua , Tan Guang Yu , Yang Shu Cai
Published: September 2012

The flow stress change of 3Cr1Mo0.25V steel was researched in this paper through hot compression tests performed in a temperature range from 800 to 900oC and with a strain rate variation from 0.01 to 10s-1. Flow stress constitutive equation was constructed according to true stress-strain curves of 3Cr1Mo0.25V steel. Results indicate that the dynamic recovery is the dynamic softening mechanism of 3Cr1Mo0.25V steel. The flow stress increases with increasing strain rates and decreases with increasing temperature. The rheological behavior of 3Cr1Mo0.25V steel can be characterized by the parameter of Zener-Hollomon in a high temperature range. As for 3Cr1Mo0.25V steel, the activation energy of Q evaluated by the linear regression is about 142.9 kJ/mol.
Microstructure Evolution of Ti-9.2Mo-2Fe Alloy
Authors: Li Cheng Lin , Lee Dong Geun , Ye Wen Jun , Mi Xu Jun , Lee Yong Tae
Published: September 2012

The microstructure evolution of a new designed metastable beta Ti-9.2Mo-2Fe alloy during aging treatment was investigated by TEM. The results revealed that athermal ω phases were observed in SAD pattern during water quenching from above the β transus temperature for the alloy. As well, isothermal ω phases were found during aging at 500 °C even though they have a limited time of stability. The coexistence of ω and α phase was found in the early aging time and the pre-formed ω phase during aging undergoes coarsening and act as uniformly distributed nucleation sites for α precipitation during subsequent isothermal aging treatment. A consequence of such ω- assisted nucleation is that relatively large amount of α precipitations are formed and fine distributed in β matrix. In addition, the α precipitations are of a relatively finer size scale (nanometers to sub micrometers).
Mechanical Characterization of Ti-Mo-Fe Titanium Alloy
Authors: Seo Jung Hwa , Lee Dong Geun , Li Cheng Lin , Mi Xu Jun , Lee Yong Tae
Published: September 2012

Microstructure characterization and hardening behavior of a new designed Ti-12.1Mo-1Fe alloy during solution and aging treatment was investigated in the present study by OM, Vickers hardness. The results showed that the beta transus temperature of new Ti-12.1Mo-1Fe alloy was about 780°C. Further observation of ω phase should be performed by TEM later. It is also found that ω phase played a more important role than α phase in hardening. The hardening due to ω phase can lead to a high hardness about 470 Hv but the coarse α phases result in a hardness below 300 Hv.
Corrosion Behaviour of Zn-Al Pseudo-Alloy Coating on Carbon Steel in Chloride Environments
Authors: Liu An Qiang , Xiao Kui , Dong Chao Fang , Li Xiao Gang
Published: September 2012

In this work, Zn-Al alloy and Zn-Al pseudo-alloy coatings are deposited on carbon steel by arc spray technology. The corrosion behaviour of the coatings has been studied by salt spray test and electrochemical experiment. The morphology of the coatings exposed to salt spray test for 400 h was analyzed using SEM and EDS. Results show that corrosion rate of Zn-Al alloy coating is faster than that of Zn-Al pseudo-alloy coating and the steel substrate is attacked. The corrosion products formed on the surface of Zn-Al alloy coating were loose, with a large number of cracks and holes, but the Zn-Al pseudo-alloy coating is converted into a stable Al-rich oxide layer, which protects the steel substrate against corrosive attacks and enhances the corrosion resistance of the Zn-Al pseudo-alloy coating. Electrochemical tests show the Zn-Al pseudo-alloy coating as a sacrificial protection coating has the capability of providing sacrificial protection for the steel substrate.
Study of Fatigue Properties of AISI4130 Steel Joined by Upset Welding in Heat Treated Condition
Authors: Mollazadeh H. , Nouruzi R.
Published: September 2012

Resistance upset welding (UW) is a widely used for joining metals parts. In this research, the fatigue properties of AISI4130 steel joined by upset welding in annealed and quenched-tempered heat treated condition are investigated. Microstructure of weld and base metals was studied using optical microscopy. Tensile, impact and fatigue tests were performed and the final fracture surface was studied by scanning electron microscopy (SEM). The fatigue resistance is better for tempered martensite base metal than for the ferrite-pearlite and upset welded specimens. Results shows during the welding, proeutectoid ferrite phase forms at the interface which reduce the fatigue strength of welded specimens. Fractography of fatigue and tension welded samples indicated that in all samples fracture occurred in the middle of weld interface. Study of fracture surface of fatigue samples shows that the final fracture mode for welded samples is cleavage.
Determine Coverlay Thickness According to Air Leakage Characteristics in Open Pit to Underground Overlay
Authors: Chao Chen , Gan De Qing , Zhu Ling Qi , Zhang Ya Bin , Lu Hong Jian
Published: September 2012

During surface-underground combined mining, the method to control the ground air leakage is adopted by the capping layer using the fragmented rocks and the discarded tailings. In order to study the air leakage characteristic with the capping, the porosity of the rock particles of seven sizes and the air leakage characteristics of the capping were studied and the relationship between the air leakage coefficient and amount of air leakage with the capping height were found basing on the laboratory analogue simulation tests. It can provide the theoretical basis for determining the capping height of iron mine.
The Detection Research of Tension about Vertical Prestressed Fine Rolled Twisted Bar in Box-Girders Construction of Civil Engineering
Authors: Lin Xing Yuan , Wu Yan Feng , Wang Wei Wei , Zhang Feng
Published: September 2012

At present, vertical prestress detection is almost blank during box-girders construction of civil engineering . In order to effectively detect the effective tension at box-girder construction process in civil engineering based on the theory of structural dynamics, scene detection means, the relationship of box-girder vertical prestressing tensile force and dynamic characteristics of the exsertion segment reinforced was established. Vertical prestress of part of the box beam segments of a three-span prestressed concrete continuous rigid frame was detected , the shortcomings of the current vertical prestressing tensile force was analyzed . The results show that: the proposed method is direct, effective and able to effectively monitor the vertical prestressing tensile force. The research has important theoretical and engineering applications for crack prevention of box-girders.
The Dynamic Analysis of Concrete Pump Truck Arm in Civil Engineering
Authors: Dai Li , Li Yun Gong , Liu Yu , Wang Jian
Published: September 2012

The concrete pump truck integrates transportation with pouring process ，which is characterized with flexibility, facility and celerity in civil engineering. As for the concrete pump truck, the arm system is the most important because the rationality of the arm directly influences the performance and pouring position of the truck in its application in civil engineering. For the arm system of the concrete pump truck, the movement of the arm system and the hydraulic cylinder are analyzed respectively with multi-body dynamic theory. By using numerical arithmetic to resolve the dynamic equation, the terminal track of the arms is analyzed. It shows that the kinetic equation built by multi-body dynamics can describe the dynamic characteristics of pump truck exactly.
Research on the Methods of Determination of Characteristic Strength of Brittle Rock Materials in Compression Test
Authors: Wang Bin , Zhu Jie Bing , Wu Ai Qing
Published: September 2012

The failure of rock materials in compression test suffers three characteristic stages: crack initiation, crack damage threshold, and macro-failure. There are some methods which can be adopt to identity the characteristic strengths in uniaxil or triaxial compression such as crack strain identifying method, AE activity and longitudinal wave velocity monitoring methods. In this paper, an creative experiment of recording stress-strain data, AE spectrums, and velocity of longitudinal wave is proposed and put into practice. Test results show that the mean initiation strength and damage strength by ratio of UCS are between 0.38 to 0.52 and 0.82 to 0.86 respectively with AE and longitudinal wave velocity methods synthetically. The AE monitoring method and the lateral P-wave or the axial S-wave test is an effective indicative of identifying the damage threshold when subject an axial compression failure.
Study on Determining Method of Rig’s Hydraulic Pressure in Civil Engineering
Authors: Sha Yong Bai , Zhao Xiao Ying , Wang Lian Dong
Published: September 2012

Rig is widely used in civil engineering. With the increasingly nervous energy supply, the problem of saving energy is caused close attention more and more. Hydraulic technology widely used in drilling equipment faces the same problem. The parameters of hydraulic system not only affect the rig’s work performance, but also impact on energy consumption and cost of the system. This paper introduced the energy saving principle and method of the rig’s hydraulic system. Taking the drilling rig’s rotary system as an example, the design pressure of hydraulic system was determined using mathematic analytic method- extreme method which is based on the energy saving principle. The method provides a reference for determining the hydraulic system’s pressure of rig.
Practical Research on Desulfurization in Converter with the Analysis of Sulfur in Steel for Civil Engineering
Authors: Zhao Ding Guo , Li Jian Sheng , Wang Shu Huan , Liu Hong Wei , Tong Zhi Xin , Wu Fei Peng
Published: September 2012

The paper analyzed the sulfur in steel for civil engineering in 150t converter in TangSteel. Based on the analysis of desulfurization process and the thermodynamic conditions in converter, the operation of desulfurization was optimized. The industrial tests for desulfurization were carried out, and the results were analyzed. The results were shown that the distribution coefficient would be the highest value, when the alkalinity of slag was 3.5 and the FeO content was 21% in making SPHD steel. The distribution coefficient would reduce, when the temperature was increased, especially more than 1700°C, so end point temperature should be best less than 1700°C.
Calculation of Water-Soil Pressure of Silt Layer in the Foundation Pit Considering the Seepage Effect
Authors: Zhang Bing Jun , Cao Jing , Zhang Xue Zhong
Published: September 2012

The water-soil pressure (WSP) is an important parameter to be considered in the foundation pit design and construction. Most of available calculation methods for WSP are based on the estimation of the water pressure and the soil pressure, either separately or together, with little consideration paid on the particularity of silt layer. The differences of WSPs calculated by separately or by together to estimate the soil pressure and water pressure in the silt soil is compared. A method for calculating the WSP in silt soil considering the seepage effect is suggested.
Analysis Research Progress on the FRP Reinforced RC Beam-Column Joints in Civil Engineering
Authors: Han Jun , Yuan Hong
Published: September 2012

This paper briefly expounds the present situation of the research on FRP reinforced RC beam-column joints from three aspects including theoretical study, experimental investigation and numerical simulation. Finally, the shortcomings of the present studies are pointed out as well as the research aspects of the field.
Mechanics Behavior Analysis of K Type Flashboard Node of Transmission Tower in Civil Engineering
Authors: Jia Yu Zhuo , Luo Di
Published: September 2012

On the UHV transmission steel tube tower, the K type flashboard node is the more common node, the destruction of the node easily leads to the destruction of the entire transmission tower. Through ANSYS software to simulate the U type and the groove type flashboard node establishs a solid model. using the arc-length method for both flashboard node does numerical analysis. Obtained U type flashboard node bearing capacity is greater . U type flashboard node belongs to the branch pipe local buckling failure mode , while the groove flashboard node belongs to the support tube, flashboard and motherboard simultaneous buckling failure mode. Recommended that we should , when bearing capacity is a greater, prior to the use of U type flashboard node in the design and engineering .
Research and Realization of Air Leak Test System in Civil Engineering Based on Virtual Instrument and Equipment Materials
Authors: Wang Chuan , Zhao Sheng Jie
Published: September 2012

Through studying the existing theory and method of equipment materials air leak test system, the characteristics of equipment materials air leak are analyzed in this paper, the air leak test system in civil engineering based on virtual instrument and equipment materials is proposed, The system uses data acquisition card basing the PCI bus, equitpment materials and LABVIEW to design, using virtual instrument and the characteristics of geotechnical investigation and surveying. The establishment of equipment materials air leak test system can not only resolve the current air leak in civil engineering, engineering survey of the shortage of regional and national figures also an important component of urban development.
Meso-Damage of Emulsified Asphalt Concrete Based on CT Test under Continuous Uniaxial Compression
Authors: Shi Yan , Yan Xiao Hu , Yang Hua Quan , Peng Shang Shi
Published: September 2012

Based on CT technology, real-time scanning and observing meso-damage evolution of emulsified asphalt concrete was carried out. With methods of visual analysis, CT number analysis and damage variable analysis, the following conclusions were obtained: during the continuous loading, the change of CT average value was little at the upper part of cross-sections, but that of the lower part of cross-sections was significant and its damage was serious. Concrete specimen experienced four stages of compaction, dilatancy, crack propagation and failure. Plastic characteristics was revealed in failure process, which due to the mechanical properties of emulsified asphalt concrete, that is the lower strength and lower elastic modulus.
Finite Element Analysis on Contact Surface Slip of Profiled Steel Sheet and Composite Slab
Authors: Liu Li , Wang Fang , Wang Kai
Published: September 2012

In order to evaluate correctly the load-bearing performance of the prestressed profiled steel sheet composite slab，according to actual loading conditions, finite element model of the prestressed profiled steel sheet and concrete composite slab is established. Numerical simulation is made to the slip of the prestressed composite slab. The calculation results show that the slip of the prestressed composite slab at ultimate status will be gradually reduced with the improvement of the concrete strength. When increasing the prestress, the slip value at ultimate status will be less reduced and increasing the thickness of the concrete can reduce the slip value at ultimate status, the deformation of the prestressed composite slab will be increased by over 10% when considering the slip of the bonding surface.
Study on Energy Material Application in Changchu City for the Low-Carbon Economy Development
Authors: Tong Xun Zhou , Liu Ting , Liu Hong Qin , Duan Hai Yan , Wang Xian En
Published: September 2012

As an old industrial base of the northeast, energy material application is Changchun’s necessary choice for the low-carbon economy development. Analysis shows that new energy materials should be applied to electric power industry. Replacing the thermal power generation mainly using coal by new energy materials power generation, energy consumption in thermal power and carbon emissions will be reduced. Second, with new energy materials applying to nonmetal mineral products and other industries, the consumption proportion of coal and fossil oil in the industrial process will be reduced.
The Flame Retardant Synergism between Cobalt Complexes and Ammonium Polyphosphate in Cottonwood
Authors: Yuan Li Ping , Wu Guo Yun , Tian Ge , Hu Yun Chu
Published: September 2012

The synergistic flame-retarded effects of a similar molecular sieve [Co5(OH)2(tca)2(ina)2 (H2O)2]•4H2O(Co5) and ammonium polyphosphate(APP) on cottonwood was studied. Compared with APP added individually, when the addition of Co5 was 1.7%, THR reduced 18.3% and the mass loss reduced 7.7%. The TGA showed that the processes of losing solvent water, coordinated water, tricarballylic acid and isonicotinic acid ligands can inhibit burning and lower the weightlessness rate. The flame retardancy of APP/Co5 was superior to that used APP individually, Co5 showed good synergistic flame-retarded effects.
Literature Review of Precast Concrete Frame Structures in Civil Engineering
Authors: Ding Ke Wei , Zhang Xiang
Published: September 2012

As construction industrialization is springing up in our country, precast concrete frame structure,as a result,has been developing rapidly. Based on a host of articles about precast concrete frame structure system at home and abroad,it,in this paper,summarized and prospected the latest stress performance research of precast concrete frame structure and up-to-date engineering application. Further more, total assembled node and seismic behavior of precast concrete frame structure is also pointed out as what is needed to study in the future.
Preparation and Performance of Porous Silica of Sound-Absorbing Coating
Authors: Chen Jin , Wang Xiao Gang , Zhang Min , Guo Ai Xia , Tang Lei
Published: September 2012

Using the poly-acrylic acid ester modified porous silica as fillers, the E-44 epoxy resin as matrix, ethylene diamine as curing agent prepared the sound absorption coating, and the sound absorption properties of and wear resistance were tested. The results showed that: the coating wear resistance increased with the addition of filler increasing，and then decreased. The wear mass of 60%filler coating is the lowest. The absorption coefficient increases with the filler increasing, the average absorption coefficient can reach 0.22 of 1000Hz frequency sound.
Finite Element Analysis of Creep Behavior of AZ91D Magnesium Matrix Composites Reinforced with Aluminum Silicate Short Fibers
Authors: Tian Jun , Zhong Shou Yan , Shi Zi Qiong
Published: September 2012

By Computer finite element analysis, the impact of the interface thickness, the interface module and the short fiber orientation of Al2O3-SiO2(sf)/AZ91D composite on the maximum fiber axial stress and the steady creep rate is studied. Maximum axial stress of the short fiber is in the fiber center, and the axial stress gradually decreases along the direction of the fiber length. When the external stress is constant, the maximum fiber axial stress increases with decreasing of the thickness of the interface, and the steady creep rate increases with the increasing of thickness of the interface. The maximum fiber axial stress increases with the increasing of the interface modulus, the increasing of the interface module improves the load transfer and the creep resistance. Finite element simulation results and experimental results can be well matched to better explain the creep behavior.
Analysis of Inclusion Microstructure in Material Engineering of Steel
Authors: Zhao Ding Guo , Wang Shu Huan , Guo Ming Jian
Published: September 2012

The sample of oxide inclusion was obtained in the different stage of steelmaking for the 65 steel. The microstructure was observed by using scanning electron microscopy (SEM) to analyze the composition and type of inclusions. It was shown that the microscopic inclusions in the high carbon steel were mainly massive and cluster Al2O3, spherical and slope silicate inclusion, calcium-aluminates inclusions and sulphide complex inclusions. The measures including raw material requirement, improving of the converter, LF refining and continuous casting operations were put forward to decrease inclusion.
Study on BaO-Bi2O3-B2O3-SiO2 Glasses in Material Engineering with Electronic Polarizability and Optical Basicity
Authors: Zhao Xin Yu , Yu Da Wei , Han Xu , Wang Xiao Li
Published: September 2012

Bismuth/barium-containing crystals have attracted much attention in application of material engineering because of their importance for the development of nonlinear optical (NLO) information processing technology. Compared to crystals, glasses have shown many advantages in the material engineering, such as easier shaping in casting procedures, low production cost and high thermal and chemical durability. Furthermore, there is a close relationship between NLO and polarizability α and optical basicity Λ for the glasses system. Prompted by these interests in application of material engineering, we reported new data of α and Λ of BaO-Bi2O3-B2O3-SiO2 glasses system (G-BBBSO) for the different wavelength range (480, 546.1 and 643.8 nm). The results suggested that the G-BBBSO have a high polarizability and optical basicity, that is, the glasses system have potential application in material engineering.
PVD Preparation Process of (TiN + CrN) / CrAlN Superhard Nanocomposite Multilayer Coatings
Authors: Tian Jun , Shi Zi Qiong
Published: September 2012

In this study, multi-source multi-target evaporation-sputtering PVD technology to prepare (TiN + CrN) / CrAlN nanocomposite multilayers, accurate modulation of the composition and structure of the coating can effectively reduce the stress in the coating in order to achieve (TiN + CrN) / CrAlN nano-composite multilayer dielectric films optimized design, to reach a good overall performance. (TiN + CrN) / CrAlN superhard nanocomposite multilayer coatings on the surface of tools and molds with carbide and high-speed tool steel materials, followed by the TiN film; (TiN + CrN) film, in the TiN relative content in the layer accounted for 55-65% , CrN relative content for 35-45%; gradient (CrxAl1-x) N-film, x = 0-0.5; structure of TiN / (TiN + CrN) / CrAlN superhardnano-composite multi-layer coating.
The Application of Carbon Fiber Reinforced Material in Sports Equipments
Authors: Chen Jin , Ji Yin
Published: September 2012

Carbon fiber and composite materials not only been widely used in aerospace, automotive and other industrial fields, but also in sports equipment to the development of one of the best selection. By introducing carbon fiber reinforced composites (CFRP) used in sports equipment, the advantages and the molding process, this high-tech materials used in the game equipment described carbon fiber, greatly promoted the improvement of sports achievements. The carbon fiber and composite materials has become one of the new materials essential for the development of modern sports equipment.
Preparation, Characterization and its Photocatalytic Performance of Rare Earth Element Erbium Doped with TiO2 Material
Authors: Li Song Tian , He Guo Xu , Ma Wei , Liu Yan Hua
Published: September 2012

In order to expand photoresponse range of TiO2, reduce energy consumption of semiconductor material optical catalytic, certain amount of rare earth element Erbiun was doped during preparation of anatase titanium dioxide to improve the light absorption and photocatalysis efficiency. A series of rare earth element doped TiO2 material were prepared by sol-gel process, and characterized by means of UV-vis diffuse reflectance spectra. UV-vis absorption verified that doping of Er3+ enhanced absorptive capacity of catalyst in visible region. The photocatalytic performance of anatase titanium dioxide and rare earth element Erbiun doped with TiO2 to basic fuchsin were studied.
Characterization of Poly(paraphenylene vinylene)-Polystyrene Block Copolymers in Solution
Authors: Guo Li , Zhang Yong Guo , Yang Shi Zhao
Published: September 2012

The influence of the solvent temperature and the solvent quality on the chain conformation and the aggregation of semiconducting block copolymers is described in this paper. In selective solvents for the polystyrene block, aggregation is detected by means of optical spectroscopy. The author thinks that the research is useful for the development of material engineering.
Preparation and Thermosensitivity of Poly(N-Isopropylacrylamide) Hydrogels with Graded Structure
Authors: Yan Qiong Jiao
Published: September 2012

A novel graded hydrogel based on poly(N-isopropylacrylamide) (PNIPAM), which is characterized with both ends of slightly cross-linked PNIPAM chains being grafted onto cross-linked PNIPAM chains, has been successfully prepared in a three-step process by a method of sequential synthesis for the first time in this paper. In the preparation of the graded hydrogels, with decreasing the crosslinker dosage, the swelling ratio of the hydrogel increased. The graded hydrogel displays faster and hydration/dehydration dynamic response to temperature cycling owing to slightly cross-linked PNIPAM chains to form big-hole structure. The proposed hydrogel structure provide a new mode of the phase transition behavior for thermo-sensitive "smart" or "intelligent" monodisperse micro-actuators, which is highly attractive for targeting drug delivery systems, chemical separations, sensors and so on.
The Current Situation and Analyze of Huizhou Traditional Architectural Components and Materials to Repair Alternative Techniques
Authors: Sun Qiang , Chen Gang
Published: September 2012

According to the Huizhou traditional architecture field investigation and relevant literature statistical analysis, elaborated the Huizhou traditional architectural structure status and the main problem caused by natural disasters and other reasons , put forward the Huizhou traditional architectural wood component appears the question to propose the countermeasure and the reinforcement method, discusses the feasibility of the method, This thesis is mainly directed against the Anhui Huangshan City Shexian cultural protection unit "Dun Mu Tang" for specific research and implementation, for the Huizhou traditional buildings and enhance the quality to provide technical reference.
The Research about Plastic Cement Playground and Constructed Materials
Authors: Hou Jiang Yuan , Zhang Shao Qing , Xia Zhen Yu
Published: September 2012

The plastic cement playground has the characteristics of flatness, high compressive strength, elastic proper hardness, physical properties and stability, coupled with a flat runway, non-slip, flexible, colorful appearance, which gives players a sense of comfort, inspiring enthusiasm, raising the level of competition, helps to speed and skill of the athletes play, effectively enhance the performance of athletes, reduce the rate of sports injury. This study describes the types of plastic cement playground; the technology of pavement and the corresponding material were introduced in the abstract. The characteristics and advantages of the plastic materials which consisted by Polyurethane and ethylene-propylene rubber were mainly discussed. It also analyzed and illustrated the trend and development of the technology of the plastic materials used in the playground.
Seismic Damage Analysis and the Study of Reinforcement Measures for RC Frame Structure Building in Civil Engineering
Authors: Gao Ming
Published: September 2012

In 5·12 Wenchuan earthquake, most of the buildings were damaged at different degrees in Mianyang. To analysis seismic damage of RC frame structure building, and investigate its reinforcement situation，the results show that: For destruction of frame column or bottom frame structure column, enlarge section method is used mostly for reinforcement in civil engineering；To serious damage of affiliated structure such as filler wall and Parapet, most of them will be demolished and built again, and add constructional column; To the situation of concrete bottom plate with crack, paste carbon fiber sheet or bottom plant steel was used depending on the structural damage degree, and jet concrete for strengthening.
Bored Pile Settlement Analysis of Pile End Grouting in Civil Engineering
Authors: Li Shao He , Lin Qun Xian , Wu Jian
Published: September 2012

The single pile subsidence quantity computation and the analysis theoretically has the load to transmit the law, the cutting deflection method, the theory of elasticity law and the lamination always legitimate and so on. This article has through hierarchical total legal analysis in bored pile end grouting after pile subsidence influence factor, And in a project as a background, establishes the single pile ANSYS finite element model in civil engineering. For the pile are no grouting, grouting pile slurry bubble size, grouting pile of grouting modulus such as the change of the situation analysis. The author drew on the bored pile end after grouting pile subsidence influence factor and the main reasons as well as some useful conclusions
pH-Induced Cross-Linking of Dopamine-Containing Block Copolymers with Fe3+ to Form Self-Healing Hydrogels
Authors: Huang Kui , Niu Yu , Wang Long Jiang , Liu Yang , Chen Jin San , Wang Ren Zhang
Published: September 2012

The unusual amino acid 3,4-dihydroxyphenylalanine with a catechol side chain is believed to impart both adhesive and cohesive characteristics of mussel adhesive proteins. Inspired by the pH-tunable coordination between catechol moiety and Fe3+, responsible for the high extensibility and self-healing properties of the cuticle of mussel byssal threads, we report the synthesis of a dopamine modified Pluronic F68 block copolymer (PluF68-Dopa) with high coupling efficiency and utilization of catechol-Fe3+interactions to yield cross-linking hydrogels with enhanced mechanical strength and self-healing properties. Ultraviolet-visible spectroscopy was used to identify PluF68-Dopa-Fe3+complex species via pH control in dilution solution. At lower pH, concentrated PluF68-Dopa-Fe3+mixture remained a fluid, whereas at higher pH an elastomeric gel immediately formed. PluF68-Dopa-Fe3+cross-linked hydrogels are not only pH-responsive but also possess self-healing properties due to the reversible bond interactions between catechol moiety and Fe3+. These new biomimetic materials are expected to have potential biomedical and engineering applications.
Numerical Simulation for Metal Powder Cross Shear Rolling Compaction
Authors: Liu Ming Jun , Liu Guang Chao
Published: September 2012

Characteristics of cross shear rolling for metal powder roll compaction were analyzed. The finite deformation elasto-plastic constitutive model and corresponding calculation code were derived based on compressible continuum mechanics. Numerical simulations were performed for the cross shear rolling of metal powder. The rolling force development law under different compaction ratio and rolling speed ratio was studied. It showed that the rolling force decreased apparently as differential velocity ratio increased. Comparisons were done between simulations and experiments from references and the reliability of the mechanical models and calculation code derived in this paper were proved.
Optimization of the Preparation Process of Nano-Sized Calcium Carbonate with Low DOP Absorbency Applied in Plastic
Authors: Zhu Hua Jing , Chen Ze Li , Xu Ling
Published: September 2012

This article filters sodium acetate as better additives by comparing the calcium carbonate obtained in the different dosage and adding manner for different additives. We discuss impact of four factors such as the amount of additives, the amount of dispersant, additive time of additives and initial temperature of carbonation on low DOP absorbency in the process of preparation of nano-sized calcium carbonate applied in plastic. And preparation conditions of this product which is to reduce DOP absorbency are studied. Nano-sized calcium carbonate with DOP absorbency of about in 40mL/100g (CaCO3 dry basis) applied in plastic is prepared. And the reparation conditions are the additive amount of 0.20% (CaCO3 dry basis), the amount of dispersant of 0.2% (CaCO3 dry basis), adding additives 5 min after the start carbonization and Carbonization temperature to 20°C.
Optimization on Thin Film Bulk Acoustic Resonator (FBAR) by Transmitting Line Method
Authors: Zhang Tao , Li Min , Liu Ping , Sun Bin , Zhou Sheng Nan
Published: September 2012

In this paper, the transmitting line method is applied to analyze the properties of FBAR, and the input impedance equation is obtained, and the series resonance frequency fs and the parallel resonance frequency fp are calculated by this method. Moreover, the elastic effects of the electrode on the effective electromechanical coupling factor, k2eff , and the resonance factor, Qs> , of FBAR are investigated by the transmitting line method. Results indicate that the acoustic impedance ratio of the electrode to the piezo-film dominantly determines the behaviors of the k2eff , the variation of Qs versus the thickness of the electrode crucially depends on the acoustic impedance ratio of electrode to piezoelectric films. The results will be applied in the theoretical optimization of FBAR, which are available to optimize the fabrications of FBARs and similar devices.
A New Anodic Bonding Method of Triple-Stack Structure
Authors: Yuan Ye , Cui Hong Juan , Wang Xing Hua , Xiao Ding Bang , Wu Xue Zhong
Published: September 2012

Based on the triple-stack structure of "sandwich" of three-axis micro-accelerometer, a anodic bonding technology about three-layer of glass-silicon-glass is brought out. As the advantage of the triple-stack structure is introduced, the process of traditional anodic bonding is expounded. Since the bonding in the first time has led the layers of glass and silicon felt together, the strength of the first bonding will be destroyed if the electrode loads on the bonding glass-silicon surface directly in the second time. For this problem, the methed using dielectric material to pass bonding voltage is proposed. The results of the experiment show that the proposed new three-stack bonding method is simple and feasible.
Creep and Microstructure of an Anion PP Filament
Authors: Zhuo Yu Guo , Liu Jun
Published: September 2012

The creep properties of an Anion PP filament was tested by stretching and analyzed. The relationship between creep and applied stress was studied. The fitted creep curves by programming coincided with the experimental curves very well. The morphology before and after fracture was observed and it is shown that creep deformation and anion releasing of PP filament is influenced by the different microstructure.
Glass/ITO/PbS/P3HT/Al: A Hybrid Film Solar Cell
Authors: Wang Peng , Fan Li Bo , Yang Meng Yuan , Zhang Zhen Hua , Zhu Xin Bing , Zhang Yan Ge , Li Pin Jiang
Published: September 2012

A new hybrid film solar cell was made with a structure of Glass/ITO/PbS/P3HT/Al. PbS film was prepared by a simple solid-solid reaction and poly(3-hexylthiophene) (P3HT) film was obtained by a spin coating method. The solar cells are photosensitive in a large spectral range (extending from near infrared to high energy side regions). Without any special treatment, the cell with an area of 0.15 cm2 has shown values of open-circuit voltage (Voc) of 85 mV and fill factor (FF) of 0.33 under an illumination intensity of 100 mW/cm2.
Polymerization of D,L-Lactide and In Situ Fabrication of PDLLA Porous Scaffolds in Supercritical Carbon Dioxide
Authors: Li Jian Hua , Luo Bing Hong , Xu Wan , Zhou Chang Ren
Published: September 2012

Poly(D,L-lactide) (PDLLA) was synthesized firstly by the ring-opening polymerization of D,L-lactide using tin(II) 2-ethylhexanoate as catalyst in supercritical carbon dioxide (scCO2). Then, PDLLA porous scaffolds were prepared in situ by scCO2extraction/pore forming technologies. The structure and the molecular weight of PDLLA were characterized by FT-IR,1H NMR and GPC respectively. The porous structure morphology of the prepared scaffolds was observed by SEM. Results showed that PDLLA was synthesised successfully in scCO2fluid, and the molecular weight and yield of PDLLA were affected by reaction time, temperature and the concentration of catalyst. The best polymerization conditions were obtained as follows: reaction time of 48 h, temperature of 100°C and the concentration of catalyst of 0.1%. SEM results revealed that uniformly distributed and highly interconnected pore structures with a unique long gully type microstructure were formed in the PDLLA scaffolds.
Effect of Different Layers of Glass Cloth on Carbon Fiber Reinforced Hybrid Composite Core
Authors: Zhang Chun Lei , Qiao Kun , Zhu Bo , Lin Zhi Tao , Xie Ben , Zhang Shi Lei , Xu Wen Sheng , Zhong Fei
Published: September 2012

The effect of different layers of glass cloth on carbon fiber reinforced hybrid composite core is studied in this work. Carbon fiber reinforced hybrid composite of different glass cloth content is made by pultrusion processing. Three point bending test and charpy impact test are taken to evaluate the toughness of different composite, and scanning electronic micro-scopy (SEM) and photograph are carried out to characterize the structure of different composite after destroyed. It is shown that, though at the cost of drop of tensile strength, the increase of glass cloth content in carbon fiber reinforced hybrid composite core improves the flexural strength and impact resistant, and does not affect the microscope destroy pattern and the microscopic structure of failure samples.
Influences of Phosphorous Gettering on Minority Carrier Lifetime Distribution of Polycrystalline Silicon Wafer
Authors: Ma Shi Hui , Hao Cai Zhe , Jiang Xian
Published: September 2012

The influences of the phosphorus gettering in PN junction formation on the distribution of minority carrier lifetime of polycrystalline silicon wafer in solar cell production process were studied. The experimental results shows that the distribution of internal defects and impurities in polycrystalline silicon wafer significantly impact on the effectiveness of the phosphorus gettering during preparation of PN junction through the phosphorus diffusion technology. Especially when the impurities were transition metal elements, it caused a large difference of the phosphorus gettering effectiveness in PN junction preparation, which was due to the presence and interaction of defects and impurities on polycrystalline silicon wafer, such as grain boundaries, dislocations, oxygen and carbon, and other metal elements. In addition, the uneven distribution of impurities and defects of also influenced the phosphorus gettering effectiveness.
Technology on Bra Pattern Structure Design
Authors: Chen Xiao Na , Jiang Dong , Wang Jian Ping , Shi Hui
Published: September 2012

The improvement on bra pattern design is important for the development of underwear enterprises as well as the comfort of bra customers. However, there are little scientific and unitive methods in the literature regarding bra pattern design on either basic bra pattern or bra parts pattern. Consequently, this paper aimed at reviewing the bra pattern design methods. First, the methods of basic bra pattern design and bra parts pattern design are described. Second, the researches on bra pattern grading rules are detailed. Last, the factors which have effect on bra pattern structure are discussed. The researches referred in this paper are helpful for the development of scientific and normative methods of bra pattern design.
Simulation of Bubbles Aggregation Process Base on Interface Compression Method
Authors: Nie Yong Guang , Mao Yu , Wang Juan , Wang Jiang Yun
Published: September 2012

Interface compression method is a VOF model presented in recent years. In this paper, the difference between interface compression method and classic acceptor-donor methods was revealed. The advection test shown the interface compression method was more accurate than HRIC scheme. The bubble aggregation process was simulated by this method using open source CFD tool OpenFOAM. Simulation shown the method can accurately capture the interface in the process of bubble aggregation and the loop flow is a key factor in the process.
Production of Carbon Dioxide Snow by Flash-Atomization for Material Cleaning Process
Authors: Shen Yi Jun , Lin Tien Chu , Wang Muh Ron
Published: September 2012

This paper investigates the production of CO2 snow by flash-atomization of liquid carbon dioxide for material cleaning process. The evolution of flash-atomization processes was recorded by means of high-speed shadowgraph. Results shows that the degree of superheat condition of liquid CO2 greatly influence the atomization modes, bobbles growth rate and concentration, and thus result in difference spray angle, spray pattern, and the structure of liquid jet which is suitable for different material cleaning applications. It is found that the spray angle first slowly increases with increase in the degree of superheat (ΔT) under external flash atomization processes. It is increased drastically as the spray transform from external-flashing to internal-flashing mode. Finally the spray angle is decreased again because of the decrease of mass flowrate due to the internal flashing processes . Moreover, the spray angle is increased as the length-to-diameter ratio (L/D) is increased. This is due to the higher bobble growth rate in terms of different pressure distribution and bobble growth time. It is also found that the external-flashing disappears at higher L/D because of the heat transfer to the liquid carbon dioxide. It is concluded that the superheated condition is useful in the control of the spray angle for material cleaning processes.
Fabrication of Superconducting MgB2-Based Nanocomposites with Magnetic Inclusions by Spark Plasma Sintering
Authors: Sandu Viorel , Ion Ivan , Litra-Cristian Paul , Sandu Elena
Published: September 2012

We present the fabrication, structural, and transport properties of MgB2-based ceramic composites with magnetic nanospheres fabricated by spark plasma sintering. The nanospheres are either carbon–encapsulated iron or iron oxide. The former nanospheres have been prepared by laser pyrolysis whereas the iron oxide was obtained by the pyrolysis of the polysiloxane-based copolymers embedded into MgB2 matrix during the sintering process. The structural data show the shrinkage of the a-axis lattice constant as a result of the partial carbon substitution for boron. However, the transport data suggest that carbon diffusion is limited to the outer layer of the MgB2 grains in both cases.
Construction of High-Quality P-Type ZnSe Nanowires/n-Type Si Heterojunctions and their Nano-Optoelectronic Applications
Authors: Lu Min , Zhao Xing Zhi , Wang Xiang An , Ren Yong Bin , Wang Li
Published: September 2012

We report a simple and low-cost method for constructing high-quality p-type ZnSe nanowires/n-type Si heterojunction by growing p-type ZnSe:N nanowires on n-type Si substrate. The heterojunction shows excellent stability and reproducibility to white light irradiation with a fast response time (103). And the photovoltaic characteristics of it exhibit a ﬁll factor of about 24% and a high power conversion efﬁciency of 0.89%.
Preparation of Water-Insoluble Antheraea Pernyi Silk Fibroin Films
Authors: Lu Shen Zhou , Mao Li , Liu Yu , Sun Shan , Li Gui Jun
Published: September 2012

Antheraea pernyi silk fibroin (ASF) solution was prepared by dissolving Antheraea pernyi silk fiber in lithium thiocyanate solution. The ASF/glycol blend films were prepared by casting aqueous solution of ASF mixed with glycol. The structure of blend film was investigated by the X-ray diffraction method and infrared spectroscopy. The result showed that the structure of regenerated ASF film was α-helix and random coil conformation. After mixing with glycol, it resulted in significant increase in β-sheet structure with the improvement of water resistance of the films. This effect was strongly dependent on glycol content in the blend film. When the glycol content was more than 45 wt%, the structure of ASF changed to β-sheet and the film became water-insoluble. The breaking strength and elongation of ASF/glycol blend film were 30 Mpa and 50 %, respectively. In summary, the ASF/glycol blend film provided a great potential as a biological material.
Study on the Axial Tooth Shape of CRT Slips
Authors: Jiang Fa Guang , Liang Zheng , Zhao Guang Hui , Yan Yong Hong , Wang Pan
Published: September 2012

As a convenient, efficient, secure and high working quality casing running tool, the top drive casing running tool (CRT) has been recognized by the enterprises and users of petroleum mechanism and instrument. Slips system is an important subassembly of CRT, which directly decides the reliability, security and casing surface quality while running or drilling with casing. Based on finite element method and contact mechanics, the research model of CRT's slips system has been established and the contact influence has been studied. The effects of front angle, bottom angle and teeth interval on the slips contact interface are analyzed. As a result, the optimal axial tooth form parameters are recommended. Based upon casing intensity verification, the analytical approach to determine the slips total length has been introduced under a given maximal weight of casing string.