bluuebunny/crossref_metadata_2025 huggingface dataset:
The Evaluation of Energy Consumption and CO2 Emission on Green Building Certification Apartments in Korea
Authors: Park Jae Han , Cha Gi Wook , Hong Won Hwa
Published: February 2014

With G-SEED (Green Standard for Energy and Environmental Design), an environment-friendly building certification system, Korea is promoting the efficient energy management in the building. In particular, apartments account for the biggest share of the G-SEED authentication results. However, there has not been enough evaluation or research on the environmental performance of buildings certified by G-SEED as well as its own institutional issues. Therefore, this study compared energy consumption and CO2 emissions of G-SEED certified apartments and non G-SEED certified apartments to analyze the environmental performance of G-SEED certified apartments. The analysis shows that G-SEED certified apartments have better results than non G-SEED certified apartments in terms of energy consumption and CO2 emissions.
Wind Load Characteristics of a Long-Span Retractable Roof Structure
Authors: Zhang Jian Guo , Zhuang Hui Min
Published: February 2014

Taking a long-span retractable roof structure, which locates in a coastal city of China, as an example, a wind tunnel test on a rigid model was carried out. This paper analyzes the wind load characteristics of this structure under three conditions: open, closed and closed with damage in small area of windows. The block shape coefficients as well as its variation with wind direction are given; meanwhile, this paper analyzes the fluctuation characteristics of wind load, obtaining the gust coefficient as well as the variation of fluctuation coefficients with wind direction, which can be applied to the design of coating members in this structure. By comparing the analysis results under three conditions, the following conclusion can be reached: the long-span structure is more resistant against mean wind load when the roof is open than when it is closed. There is no decrease in fluctuating wind load and in some wind directions; the fluctuating wind load will be even larger. Additionally, the damage in small area of windows does not much affect the wind load characteristics on structure.
Design of the Envelope System to Implement the Zero-Energy on High Rise Multi-Unit Dwelling in Korea
Authors: Choi Bo Hye , Choi Gyeong Seok , Kang Jae Sik , Song Seung Yeong
Published: February 2014

The market size of green building is presumed to be occupying about 5% on construction market in 2008. Since then, the green building market kept enlarged up to about $3.7 trillion. Eventually, the market is forecast to grow about $78 trillion in 2020. According to the case of Passive House in Germany, the house is no longer high cost and future-oriented dwelling form but customer can afford like an existing house due to a drop in prices. Therefore, it is predicted to obtain a competitive price on the Green Home market soon in Korea. This research demonstrates the possibility to secure economics at this stage when the Zero-Energy on High Rise Multi-Unit Dwelling is fulfilled with a commercialization and consisted of expended incentive policy.
Influence of Insulation Type on In-Plane Shear Behavior of Insulated Concrete Sandwich Panels (ICSP) with GFRP Grid Shear Connectors
Authors: Kim Hye Ran , Kang Dae Hyun , Yun Hyun Do
Published: February 2014

This paper reports the experimental results to evaluate in-plane shear performance of insulated concrete sandwich panel (ICSP) with glass fiber-reinforced polymer (GFRP) grid shear connectors. The variables considered in this study are the grid size (35 and 53mm) of GFRP shear connectors and the types of insulation (expanded polystyrene, EPS and extruded polystyrene with special slots, XPSS). For loading in-plane shear force to interface between inner and outer wall of ICSP system, the ICSP specimens were supported vertically at the bottom edge of the two concrete outer walls by steel blocks. The test results indicate that ICSP with XPSS developed higher shear flow strengths in ICSP with EPS when 35mm spacing of GFRP grid is used. Also, the test results indicated that as the grid spacing of GFRP shear connector decreases, the shear flow strength of ICSP with XPSS insulation was higher, but the shear flow strength of ICSP with EPS insulation was lower.
Research of Window's Discharge Coefficient in the Natural Ventilation Room
Authors: Liao Qi Hai , Guan Yan Ling , Wang Qiao Ning
Published: February 2014

Discharge coefficient of window is one of the important factors in natural ventilated calculation, while there are many factors may impact the windows discharge coefficient. This article adopts the method of experiment, simulate the natural ventilation of room on the test bench , by measuring the pressure difference of both sides of window and the air flow through the window under different experimental conditions, analyze how the opening rate of window and the air flow impact the values of discharge coefficient of window, and giving the value of discharge coefficient of window under the experiment condition, hoping to provide help to the use of natural ventilation of building effectively.
Study on the Problems and Solutions of Building Energy Efficiency
Authors: Jiao Ling
Published: February 2014

With the development of economy, the progress of the times, the city continued to expand the scale of construction, building energy consumption is more and more serious, and the green energy-saving buildings are paid more and more attention in society. Building energy efficiency can fundamentally promote the savings and the rational use of energy and resources, Building energy efficiency is the needs to guarantee the sustainable development of national economy. With problems in building energy efficiency as the point of penetration, this paper analyses the present situations of building energy consumption and the major energy-saving issues in China. On the basis, in order to promote the green building of sustainable development, from thinking, evaluation system, design and other aspects some suggestions and measures are proposed .
Application to Envelope System Remodeling for Improving Energy of Public Building
Authors: Choi Hyun Jung , Kim Yu Min , Jang Min Seon , Choi Gyeong Seok , Kang Jae Sik
Published: February 2014

Recently, revised certification of Building Energy Efficiency Rating System has been distendedly implemented in public buildings. The Ministry of Land, Infrastructure and Transport in Korea is promoting a Green Remodeling pilot project and proceeding a variety of researches related to the method of Energy Efficiency improvement. The aim of this study was to compare the amount of building energy consumption by improving envelope systems such as curtain wall, window, and wall system of deteriorated public buildings. By improving the envelope system, heating energy consumption has been reduced about 37%.
Thermal Characteristics of Mat Foundation with Different Lift Thickness of Mass Concrete Including Strontium-Based Latent Heat Binder
Authors: Ahn Kyung Lim , Liang Qi Bo , Khil Bae Su , Yun Hyun Do
Published: February 2014

This study provides analytical results for heat of hydration in the mat foundation with mass concretes to investigate the effect of lift thickness in the mat foundation on the hydration heat and crack characteristics of mat foundation with mass concrete. Mass concretes were mixed with ternary cement with 1% strontium-based latent heat binder at volume fraction and Type IV low heat cement. The mat foundation has the dimension of 15m length, 20m width and 3m depth. Lift thickness of mass concrete for mat foundation was varied from 1.0m to 3.0m. A commercial software MIDAS/Gen was used to analyze the hydration heat of mass concrete foundation. The maximum adiabatic temperature rise (K), and the coefficient of temperature rise (α) for thermal analysis were drawn from adiabatic temperature rise test. Based on the results of the finite element analysis for mat foundation with different lift thickness, the highest internal temperature and thermal stress increased with increasing with lift thickness of foundation. However, for foundation constructed with premixed strontium based latent heat binder (PSLB) concrete, this phenomenon was less remarkable compared to mass concrete foundation made with low heat cement.
The Research and Application of Airport Pavement Recycled Concrete
Authors: Liu Xiao Jun , Zhu Chen Fei , Wu Yong Gen , Liu Qing Tao
Published: February 2014

The overhauling, rebuilding and enlarging of airport pavement often produce vast waste concrete. Use of these concrete as recycled aggregates, make recycled concrete. And by adopting the “double-mixed” technique with high quality fly ash and high efficiency admixture, optimizing the mix proportions design of pavement recycled concrete, research its mechanical properties and verify its application effect.
Advances of Monitoring Corrosion in Reinforced Concrete Based on UGW
Authors: Zheng Zhu Peng
Published: February 2014

Monitoring the condition of steel corrosion in reinforced concrete (RC) is imperative for ensuring structural serviceability and durability of RC structures. The techniques based on ultrasonic guided wave (UGW) gain more and more popularities as they have many advantages for monitoring corrosion in reinforced concrete. In this paper, UGW based monitoring techniques in the past decade are reviewed, including corrosion monitoring mechanism and feature extraction, monitoring corrosion induced deboning, monitoring pitting corrosion, monitoring corrosion induced interface roughness. Finally, the challenges and future trends in the development of UGW based monitoring techniques for condition assessment of corrosion inreinforced concrete are put forward in this paper.
Environmental Performance for Two Formwork System Types: Conventional Formwork & Steel Formwork System
Authors: Taher Ahmed Mohammed , Zakaria Rozana , Mohamad Zin Rosli , Hussien Ahmed Rania
Published: February 2014

Environmental aspect is one of the important criteria that define and determine sustainability performance for concrete formwork system. This study is aimed to compare the performance of the most common types of formwork system Conventional Formwork & Steel Formwork System in responding to environment category of sustainability development using questionnaire survey distributed among construction experts. The steel formwork system gets 11.5 score points while conventional formwork collects 7.8 points of total 19.4 score can be achieved. Overall steel formwork performance surpasses the conventional formwork while their score for formwork reusable element was adjacent with only 0.5 score difference meantime steel formwork had override conventional formwork in impact on local environment element. Generally steel formwork system may conceder as more environment friendly than conventional formwork especially in waste generation and using renewable material.
Enhanced Heat Transfer with Short Pin Fins in Hot-Air Anti-Icing System
Authors: Peng Long , Lin Gui Ping , Bu Xue Qin , Liu Lu Qin , Cai Yan
Published: February 2014

A new rectangular anti-icing structure with short pin fins is presented in this paper. Detailed experimental research is applied to discussing its heat transfer and enhancement characteristics. The results show that, heat transfer of this anti-icing structure enhances obviously, and the core factor for enhancement is the volume ratio occupied by pin fins in rectangular channel of anti-icing structure.
Research on Innovative Design of Remanufacturing Products in the Field of Construction Machinery
Authors: Ren Gong Chang , Yu Feng Hai , Lv Ruo Chen
Published: February 2014

The traditional remanufacturing mostly focus on the technical measures which are aimed to keep and restore the available state after products design, produce and put into use. The design work before they are put into use is less involved. The high-level product innovation design theory, for exampleTRIZ, can scientific refining innovative ideas and provide mature theoretical system and method for design problems. Reasonable use them to innovative design the remanufactured products can scientific guiding products remanufacturing process, increase the scientific nature of the decision-making program and create enormous social and economic benefits.
Mixing Pile and Rotary Jet Grouting Pile New Monitoring Technology Research and Application
Authors: Su Xiao Cheng , Zhu Lin , Liu Zhi Feng
Published: February 2014

Construction of buildings on soft ground, key issues need to improve the bearing capacity on soft ground. The cement mixing pile and high pressure rotary grouting pile technology are widely applied in road soft foundation consolidation engineering. However, due to the impact of various factors of construction technology, machinery and equipment, geological conditions, such as the quality of the construction team, quality control has great difficulty. This paper presents three indicators - SPT blow count, and core samples described and unconfined compressive strength of cement mixing pile quality evaluation, which SPT blow count based, core sample description, followed by anti-supplemented unconfined compressive strength. According to certain standards of each score, and assign different individual scores are weighted average weights to obtain weighted score of three indicators of the quality.
Research on Road Performance of Desulfurized Rubber Asphalt and Mixture
Authors: Wang Chun Wei , Wang Fei , Zhang Wen Gang
Published: February 2014

In order to discuss the road performance of desulfurized rubber asphalt and mixture, Swelling mechanism of desulfurized rubber asphalt was studied first, and then performance testing of KLMY90#, normal rubber asphalt and desulfurized rubber asphalt were taken, after that, penetration, shear strength and cohesive strength of desulfurized rubber asphalt mortar were test, road performance of desulfurized rubber asphalt mixture were test at last. The results of the study show that, there is no Rubber particle core, but lots of chemical reaction in desulfurized rubber asphalt; the performance of desulfurized rubber asphalt is better than normal rubber asphalt without high viscosity, easy isolation and poor high temperature storage stability; shear strength and cohesive strength of desulfurized rubber asphalt mortar is better; and desulfurized rubber asphalt mixture have good road performance.
Preparation of Ni-Co Alloy by Electrodeposition
Authors: Marita Yusrini , Ridwan  , Nanda Satri , Nurdin
Published: February 2014

Nickel-cobalt alloy coatings were prepared on copper substrates by electrochemical deposition at various deposition current densities of 10, 20, 30, 40 and 50 mA cm-2. Ni-Co alloy coating have been prepared by elecrodeposition technique due its low cost, easily maintainable equipment, easy control of film thickness and the method is also environmentally friendly. The effect of current density on deposit composition, structure, morphology and microhardness of electrodeposited Co-Ni alloy deposits were studied and discussed. The values of the current efficiency obtained are in the range of 68 95 %. From surface morphology obtained the current density increasing promotes the formation colony structure. Increasing the current density led to finer grain structure in Ni-Co deposit. The microhardness of electrodeposited Ni-Co coatings are in the range 482-610 HV.
Excitation Liquid-Cooled Retarder Control System Design Based on MC9SXS128
Authors: Tu Bing , Zhang Wei , Zhan Teng Xi
Published: February 2014

This paper presented a excitation liquid-cooled retarder control system based on a microprocessor MC9SXS128. In order to achieve the constant speed, It used PWM to adjust the output current of excitation liquid-cooled retarder. It analyzed and calculated the inductance value in PWM output circuit and also analyzed the excitation liquid-cooled retarder control systematical mathematical model . It divided the brake stalls based on the current flowing through the field coil. by adding the PID closed-loop control system, the retarder could quickly reach the set speed. It tested the PID control algorithm at the experiments in retarder drum test rig and the results show that the control algorithm has good control performance to meet the application requirements.
Experimental Investigation of the Indoor Thermal Comfort of the Public Buildings in the Typical Subtropical Climatic Region
Authors: Wang Zhang Yuan , Zhang Xiang Mei , Yang Wan Sheng
Published: February 2014

Aim of the paper is to investigate the indoor thermal comfort of the buildings. This work is undertaken by the combination of the literature review and experimental measurement and analyses, on basis of the selected 12 public buildings in Dongguan City (Guangdong Province, China), located at the typical sub-tropic climatic region. It was found that when the air-conditioning system was turned off, the internal surface temperature of the insulation was above a control target of 30°C; when the air-conditioning system was turned on, the internal surface temperature of the insulation was below the control target of 30°C, meeting the requirement of the thermal comfort of human body in summer. These figures will be helpful in the determination of the quantitative control target to improve the indoor thermal comfort in the subtropical areas.
Study on Principle and Application of Heat Pump Technology
Authors: Zhang Jian , Wang Hui Yu , Zhang Jian
Published: February 2014

This paper studies the low temperature heat source heat pumps to improve the efficiency of the heat pump unit with economic principles and the use of compressed improve the working conditions of the compressor, and to explore the system operating mode. A new test run integrated heat pump system is designed. Heat pump system can be controlled by the intelligent control of the implementing agencies, to improve the economic system, the research of this paper can provide a potential basis for the efficient use of energy heat pump.
The Case Study on Optimization of Large Scale Heating and Cooling Network
Authors: Liu Lan Bin , Zou Ai Juan , Liao Jia Jun , Ma Yu Fei
Published: February 2014

This paper discussed the optimization of two cases of large scale heating and cooling system. One is the heating/cooling system with heating/cooling source with distance from load center, the other is the heating/cooling system with heating/cooling source located in the load center. The affect of the temperature difference between supply and return water, load density and the price of energy towards optimized radius and max radius was discussed using the existed model. The optimized radius and appropriate system parameters are got. It is a reference to the designers and operators related.
The Optimization of Large Scale Heating and Cooling Network
Authors: Liu Lan Bin , Zou Ai Juan , Liao Jia Jun , Liu Ya Meng
Published: February 2014

It is a question if large scale heating/cooling network could be applied in China economically, environmental protection and energy saving. Toward this question, this paper studied the optimization of large scale heating and cooling network. The components of the system are analyzed and modeled in detail including heating/cooling source, heating/cooling users and transmit system. And the system can be optimized through the way of Life Cycle Cost, which compared the cost of large scale heating and cooling system with conventional system. The optimization also takes efficiency and economy in to consideration.
The Preparation of Ordered Mesoporous Al2O3 and its Application in Ni-Based Catalysts for CH4/CO2 Reforming
Authors: Mo Wen Long , Ma Feng Yun , Liu Hong Xia , Hao Shi Hao
Published: February 2014

Template method was used to prepare ordered mesoporous alumina, and with purchased γ-Al2O3contrast. BET results showed that the specific surface area and average pore diameter of the mesoporous Al2O3were 226.95 m2.g-1and 3.91nm respectively, and with higher degree of order. XRD results showed that the cat-P catalyst with the carrier of prepared ordered mesoporous alumina hold small active component grains, which means better dispersion. H2-TPR results showed that the SMSI effect of cat-P catalyst was stronger than that of cat-B. Stability tests showed that cat-P catalyst in 50h experiment showed high activity and stability, and the conversion of CH4and CO2were above 90% and 95% respectively among the reaction time, and the deactivation rate of CO2was 0.05%/h only. From TG-DTG curve could be seen that the deposition carbon on cat-P catalyst after 48h reaction was in whisker form, which did not cover the active sites and had little influence on the activity and stability of the catalyst.
Research on the Development Barriers of BIM in China
Authors: Liu Hua , Liu Qian
Published: February 2014

In recent years, the building information modeling (BIM) has gained rapid acceptance in the building industry in China. In the near future, BIM will be able to provide a three-dimensional product model for the full life cycle management to the related parties of the construction industry. This article firstly expounds the significance of this study, then it describes the development and application of BIM in china and abroad. Finally, this article mainly introduces the barriers of promoting the use of BIM in our country and advices, it provides an important reference value to promote BIMs broader and deeper application in the Chinese construction industry.
Effects of Mg17Al12 Precipitate on Corrosion Resistance of Al Ion Implanted AZ31 Magnesium Alloys
Authors: Li Peng , Liu W.M. , Wang M.Q.
Published: February 2014

Al ion implantation of AZ31 magnesium alloy is carried out with an ion implantation dose of 1×1017 ions/cm2 at room temperature and at elevated temperature of about 200°C. ß-Mg17Al12 precipitate is observed on the ion implanted sample at elevated temperature by X-ray diffraction (XRD). Potentiodynamic polarization curves indicated that the corrosion potential and pitting corrosion breakdown potential for the samples implanted at elevated temperature are 330 and 480 mV higher than those of the unimplanted sample, respectively. The ß-phase precipitate is beneficial to the improvement in corrosion resistance of magnesium alloy. In addition, Al enrichment on the implanted surface also contributes to the improved corrosion resistance.
Design and Implementation of the Software Testing Management System Based on Django
Authors: Li Zhi
Published: February 2014

As the complexity and reliability requirements of software projects increase constantly, software testing is becoming more and more prominent and important in software engineering. Testing management system is the basis of constructing software testing management system. It regulates software testing processes, and ensures the entire testing process is under control. Based on the Django framework, this paper design and implement a test management system based on B/S architecture. It can operate as a common platform for software testing management, and reduce the cost and cycle of software testing, guarantee the quality and efficiency of software testing.
Evaluation Criterion for Threshold Segmentation Algorithms
Authors: Dong Yu Bing , Li Ming Jing , Sun Ying
Published: February 2014

Threshold-based segmentation algorithms are introduced and simulated. In order to evaluate the performance of various threshold segmentation algorithms, the quantitative experimental criterions are introduced and applied. And through large experiments by using MATLAB, threshold segmentation algorithms are evaluate with uniformity measure (UM), shape measure (SM) and gray-level contrast (GC). The effect of image segmentation is described by using the average value of three experimental criterions (UM, SM and GC).
Evaluation and Research on Block-Division Based Image Segmentation Algorithm
Authors: Dong Yu Bing , Li Ming Jing , Sun Ying
Published: February 2014

The block-division based segmentation algorithm is raised in this paper, which overcomes the shortcomings of the whole and single threshold method. Each block is processed with two-value segmentation algorithm, and finally, all blocks are combined for image recovery. In order to evaluate the performance of block-division based segmentation algorithms, some experiments are carried out by using Matlab 7.0. Experimental results show that block-division based segmentation algorithms can perform well and get a better result than the other threshold segmentation algorithms.
Research on the Grinding Crack Causes and the Preventive Measures of the Solid Carbide End Milling Cutter
Authors: Chen Xiao Jian , Zhu Hai Yan
Published: February 2014

Based on the carbide material characteristics of two low and three high and its process characteristics, analysis the carbide milling cutter is easy to form crack defects in the grinding process. Through a briefly introduce the milling mill grinding process, the cemented carbide milling cutter grinding cracks are produced by a variety of reasons are detailed researched; Based on the causes of crack of the carbide milling cutter, the feasible preventive measures are put forward. And these research results can significantly reduced the crack phenomenon in the process of milling cutter grinding in corresponding enterprises, and which is of great significance for reducing the production cost for enterprises.
ICE Fault Diagnosis Method Based on Mutual Information and WVD Time-Frequency Analysis
Authors: Wang Xin Jun , Cai Yan Ping , Lin Xu Ze
Published: February 2014

A new time-frequency analysis method based on mutual information and EMD-WVD time-frequency analysis is proposed. The method uses EMD to decompose signals into independent intrinsic mode functions (IMF), uses the mutual information of EMD intrinsic mode components and original signal as basis to determine EMD false modal component, and uses WVD of EMD true Intrinsic Mode to reconstruct the WVD of original signal for feature information extraction. ICE fault signal time-frequency analysis results show that the proposed method can effectively improve the accuracy of WVD time-frequency analysis, and correctly analyze characteristics of the signal.
With Expander Three-Dimensional Model as an Expander, Application of 3DS Max Technology in Multimedia Teaching
Authors: Zhou Quan , Liu Chao
Published: February 2014

Multimedia teaching is more and more widely applied in education of college, which has many advantages, such as vivid, highlight and so on. With the development of computer technology, three-dimensional model has been applied in various fields. It can be very good to solve huge structure, detail structure expression is not clear. Through it, students can see like a real engineering entity, which can stimulate students interest and improve the ability of understanding. In this paper, we have a further study of modeling method, and use the 3ds Max modeling software to establish expander model of the unit. According to the method of impeller modeling to verify the modeling way which has been chosen in this paper is practical. It has many advantages for the 3ds Max software technology in the application of multimedia teaching.
Study on Tender Offers Decision-Making Based on the Sand Table Experiment
Authors: Liu Hong Yong , Chen Jie , Cao Yong
Published: February 2014

This article discusses about the decision-making method of tender offer based on the engineering project management simulation experiment. The research first simulates the project construction process to explore possible ways to reduce cost. Then, combining with the lowest biding price standards in China, it analyzes the internal relationship between biding price and the lowest cost and finds the determining factors of calculating biding quotation. Next, the research determines the final biding price based on the biding price concepts and several other factors, for instance, competitors’ technical skills, management skills and biding strategies. Finally, this article applies the method in the decision-making process of Triumphal Arch tender offer project and proves the feasibility of the method.
Study on Cost Management of Engineering In-Construction of Highway Enterprise
Authors: Cao Li Na , Fu Dao Chun
Published: February 2014

How to effectively control the cost of engineering in-construction is the urgent problem to be solved for highway enterprise. In order to maximize the enterprise profit, cost control measures are discussed in this paper as following aspects, human resources, raw materials and project management. This can be used as reference for highway enterprise.
Promote the Development of Tennis through Applied New Macromolecule Polymer Material in Tennis Racket Design
Authors: Zhang Yuan , Li Meng Long
Published: February 2014

Tennis has gradually become a very important leisure and entertainment project, and it has been popular among the extensive tennis fans. People pay close attention to the tennis materials and keep doing research all the way. Since the beginning of tennis, the tennis materials has been changed constantly, which ranges from the initial wood to the gradually emerging new macromolecule polymer material. The new macromolecule polymer material is of high intensity, toughness and antiknock, which is rather applicable to the tennis design technology. However, so far due to that the macromolecule polymer materials cost is higher, its promotion is limited in certain scope, and mainly be selected by the professional competition tennis players. And most of the tennis fans generally are in favor of the traditional tennis racket. This paper conducts comparing on the traditional material of tennis racket with the macromolecule polymer material of tennis racket, and makes it stand out so as to display the wide prospect of the application of the new macromolecule polymer material in the tennis design technology.
Comparative Study on the Composites with Chopped Different Parts of Rice Straw as Raw Materials
Authors: Wu Chuan Bao , Yin Jian Mei
Published: February 2014

The upper part and lower part of rice straw were respectively used as raw materials to prepare composites with poly (vinyl alcohol) (PVA) by hot-pressing at 140°C for 10 min. The performance differences of two kinds of composites were studied. Results showed that composites prepared with upper-part rice straw had higher tensile strength, strength at tensile break and hardness than that with lower-part rice straw. But the tensile elongation of composite prepared with upper-part rice straw was lower than that with upper-part rice straw. Difference ratio of tensile strength is higher than 6% and difference ratio of tensile elongation is higher than 16%. These differences were related to morphology and structure of upper-part rice straw and lower-part rice straw. Two parts of rice straw are both hollow, but upper-part rice straw has thinner holes. So the defect ratio of composite prepared with upper-part rice straw was low.
Eco-Friendly Synthesis of Sulphonic Acid Oxime Esters Catalyzed by 2-(1H-Benzotriazole-1-yl)-1,1,3,3-Tetramethyluronium Tetrafluoroborate
Authors: Shi Wei , Zhang Ji Ming , Zhou Jian Hua , Zhou Jian Hua , Ding Song Song
Published: February 2014

Herein we describle a facile synthesis of sulphonic acid oxime esters in acetonitrile from the corresponding sulphonic acids and oximes catalyzed by the environmental friendly 2-(1H-benzotriazole-1-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate (TBTU) in the presence of triethylamine (TEA) under mild conditions. The present approach offers the advantages of a clean reaction, simple methodology, employing readily available catalyst, short reaction duration, high selectivity and high yield.
Effects of Heat Treatment on the Properties of Polyurethane/Clay Nanocomposites Paint
Authors: Rihayat Teuku , Suryani Salim , Zaimahwati Zaimahwati
Published: February 2014

Polyurethane is a very versatile polymer but it has poor thermal resistance and mechanical resistance. Thus, clay was added in the polyurethane and the thermal properties are determined by a bomb calorimeter. There were two type of clay used which are treated clay and untreated clay. Clay (treated and untreated) was added into polyurethane by Thermal Haaka by extrusion process. In the research, treated clay showed according to the references statement. Addition of 5wt% of treated clay reduced 85% of the heat combustion of the polyurethane while for untreated clay the reduced heat combustion is not too significant. This is because the sensitivity of the bomb calorimeter to the surface area that contacted to the ignition wire. Treated clay certainly can reduced the heat of combustion to 85% of polyurethane with additional of 5wt% of treated clay.
Application of a Method on Optimization of Thin-Walled Column's Crashworthiness Based on Metamodel
Authors: Mo Yi Min , Zhang Jie , Qin Bing Heng , Lv Jun Cheng
Published: February 2014

In this paper the crashworthiness of a thin-walled column is selected as the optimization goal and its section gauge size parameters are defined as variables. We use Optimal latin hypercube design method and ASA optimization method respectively to define sampling design points and find optimal design in Kriging metamodel, constructed using function values in FEM results at sampling design points. A design space updating method is introduced in this paper to reduce computational consumption and improve accuracy by several rounds of metamodeling and optimization, practice shows that object parameter SEA in each round converge to a final one, constrained by the demand of no weight added. High accuracy and rapid convergence of this method will be verified by comparison between results by this method and FEM.
Research on the Method of Numerical Calculation for Hydrodynamic Parameters of Underwater Vehicle
Authors: Hu Jin Hui , Hu Da Bin , Xiao Jian Bo
Published: February 2014

In order to solve the problem of hydrodynamic parameters of underwater vehicle are unknown and the actual measurement is difficult, a numerical method based on mesh is presented. The underwater vehicle model is established, vehicle surface and flow field is meshed. The method of calculating numerical water power coefficient is studied by numerical experiment in direct navigation. Compared with the parameters obtained in the constraint model test of vehicle, the results showed that the calculation method is accurate, convenient and effective.
Diffraction of Elastic Waves by a Cylindrical Nanohole
Authors: Wang Li , Wei Pei Jun , Liu Xi Qiang , Zhang Gui
Published: February 2014

Diffraction of in-plane wave and out-plane wave by a cylindrical nanohole is investigated. The surface elastic theory is used to consider the surface stress effects and to derive the boundary condition on the surface of the nanohole. The plane wave expansion method is applied to obtain the scattering waves. The scattering cross section and far-field scattering amplitude are numerically evaluated. The influences of surface stress are discussed based on the numerical results.
Center Track Analysis and Simulation Considering Effect of Vortex and Perturbation of Cutting Fluid on BTA Boring Bar
Authors: Zhao Wu , Chen De Jie , Hu Zhan Qi
Published: February 2014

In order to reveal the motion center track of boring bar during heavy-duty deep-hole boring trepanning processing, a new model is proposed considering both linear item and cubic item to describe nonlinear factors of the bars stiffness. The study mainly investigates two factors: vortex instability caused by outside cutting fluid, and perturbation instability caused by inside cutting fluid of the boring bar. Vibration amplitude of the bar changes with the nonlinear stiffness coefficient while the bar works at the same rotation speed. The results of numerical calculation and simulation are obtained, when the processing parameters match the combinative operation parameters under the different motion status. It shows the bar interaction with external cutting fluid while it is subjected to unbalanced force. These behaviors will induce self-exited vibration of bar, meanwhile the center track will be a closed curve loop. Boring bars vibration is always in a certain vibration amplitude. The maximum vibration amplitude is near the region of ω/2 and 2ω in the x direction.
Fault Mechanism Analysis and Characteristic Extraction for Multi-Disc Clutch
Authors: Chen Man , Li He Yan , Ma Biao
Published: February 2014

The thermo-elastic coupling model of clutch friction pair is established by the thermoelastic instability theory to acquire the basic process of friction disc warp due to hot agglomeration; according to this process, thought of reflecting initial phase clutch fault by observing the partial deformation generated by hot spots is proposed in this paper. And based on this thought, the multi-disc clutch dynamics simulation model is established to acquire the dynamic characteristics existing on the friction pair when tiny deformation happens; according to vibration characteristics of this characteristics and the feature that the interference noise of the high frequency section of the transmission system is comparatively light, and based on the analysis on the difference of frequency spectrum of the high frequency section before and after shifting gears, a new kind of initial phase multi-disc clutch fault diagnosing method based on vibration signal analysis is proposed. The test results further prove that, this method can be used to extract the impact vibration generated by tiny deformation happened on the friction pair, and is hopeful to be used in the practical engineering of initial phase multi-disc clutch fault diagnosing.
Redundant Actuation Investigation of a 5-DOF Parallel Robot
Authors: Cheng Li , Zhang Xiao Guang , Zhao Yong Sheng
Published: February 2014

A 5-DOF (degree of freedom) parallel robot with redundant actuation is introduced. The force transfer matrix is set up and the influence of redundant actuating force is analyzed with influence coefficients. Based on the conventional Lagrange Equation, the dynamic formulation of this parallel robot with redundant actuation is derived. By taking joint friction into consideration, the redundant driving force optimization is analyzed in detail. This redundant force optimization strategy has been applied to the 5-DOF parallel robot successfully.
Existence and Multiplicity of Solutions for the Semi-Linear Dirichlet Problem with a Logarithmic Nonlinear Term
Authors: Li Yuan , Sheng Ai Hui
Published: February 2014

The Dirichlet problem with logarithmic nonlinear term doesn't satisfy (A.R) condition. By using the variant mountain pass theorem and perturbation theorem of variational methods, the existence of nontrivial solutions are established for . We also introduce some deformation of equation with a logarithmic nonlinear term, the sign-changing solution, the Nehari manifold theory, bifurcation theory, improve the theory of variational methods.
Application of Wavelet Transform with Tunable Q-Factor to Analysis of Non-Stationary Harmonics
Authors: Zhang Run Han , Hu Luo Quan , Fan Wei , Liu Xiao Lin
Published: February 2014

Harmonics of power system include steady and transient components, extraction and analysis of them can improve the power quality. Tunable Q-factor wavelet transform (TQWT), for which the Q-factor can be easily specified, is adopted to accomplish the extraction of non-stationary harmonic component from the noisy signal. The proposed method decomposes a signal into noise component and non-stationary harmonic component based on suitable Q-factor. Feasibility and effectiveness of the proposed method are verified by the simulation study.
The New Method about Calculating Geometric Parameters of Hypoid Gear
Authors: Wang Xiao Lin , Li Yan
Published: February 2014

In this paper, it introduces a new method about calculating geometric parameters of hypoidgear. After changing the geometric parameter calculation method made by Gleason company, we can expand 16 solving equations to 20 equations, through establishing three layers of iterative solution conceptions and applying the optimal computation of modern design theory to solve all the geometric parameters, which not only solve the problem about the Gleason method without considering the changing parameters, but also improve the accuracy of the parameters and the stability of the iterative process. Finally, these also lay a foundation for the parametric design of hypoid gear.
Design of a Magnetic Wall-Climbing Car
Authors: Lv Qiong Ying , Mei Yu Shi , Tao Xi Jia
Published: February 2014

As the trend of large-scale wind Power, People pay more attention to wind energy, which as a clean, renewable energy. Traditional unarmed climbing and crane lifting has been unable to meet the requirements of the equipment maintenance. Magnetic climb car can automatically crawl along the wall of the steel tower, the maintenance equipment and personnel can be sent to any height of the tower. The quality of the magnetic wall-climbing car is 550kg, which can carry 1.3 tons load. In this paper completed the magnetic wall-climbing car design and modeling, mechanical analysis in static and dynamic, obtained with the air gap and Magnetic Force curves. The application shows that the magnetic wall-climbing car meets the reliable adsorption, heavy-duty operation, simple operation etc..
The Gears System Reliability Analysis with Correlation among the Components of Gear Box in Self-Propelled Gun
Authors: Tao Feng He , Mou Peng Bo , Jia Chang Zhi , Ma Wan Li
Published: February 2014

Against the accurately solving of system reliability was inadequate, the Copula function was applied in system reliability analysis of weapon equipment, the paper established system reliability model which obtained the second shift single driving, and obtained the common relationship between travel and system reliability degree, it tested that Copula function was better to solve correlation problem in the system reliability model .It provided a method for system reliability analysis and reliability susceptive analysis.
Design of Smart Car Video Capture System Based on SAA7113
Authors: Zhang Hui , Liu Yong Xin , Gao Peng Bo , Shi Lei
Published: February 2014

For the purpose of making a smart car which can recognize the road make up of a black line wide of 2.5cm and white background, a video capture system based on SAA7113 is designed. The chip SAA7113, a video decoder, is used for video capture of the smart car. First, the hardware of SAA7113 peripheral circuit is designed, through the SAA7113, the analog video signal collected from CCD sensor is converted into digital, and the valid row signals and parity field signals are extracted. Second, the initialize configuration of SAA7113 is realized via the I2C bus. Finally, the algorithm of video capture is proposed. The results showed that the video capture system can get a 30x80 image every 20ms, and the image can basically reflect the road information, which can be meet the control requirements of the smart car.
Application of a Programmable Partial Discharge Calibrator
Authors: Hu Yun , Zhang Xing , Zhang Wei Dong , Sun Qing Sen , Cao Ling Yu , Hu Yue
Published: February 2014

This paper presents the application of a programmable partial discharge calibrator, which used to test the performance of four partial discharge measuring systems by injecting a program controlled known charge sequence into the device under test. Performance of linearity, response to opposite polarity pulses, pulse resolution time and response to random pulse sequence are compared and the results obtained show that the tests prescribed by the standards do not fully characterize the partial discharge measuring system behavior. A random partial discharge pulse sequence generated by this calibrator can help to evaluate those systems.
Based on Image Processing Technology of Trajectory Monitoring Analysis Research
Authors: Li Hong Mei
Published: February 2014

At present, the urban road traffic is very congested, and a large part of the road congestion caused by the reason is that some drivers do not according to the traffic line markings driving .This paper proposes the image processing method which is based on the level of brightness to complete vehicle trajectory monitoring analysis and recognize automatically the information of the illegal vehicle plate, so the method which is applied in monitoring illegal vehicles has great reference value.
The Research on Intelligent Wireless Communications Robot Collaboration Control System
Authors: Li Hong Mei
Published: February 2014

With the rapid development of robot technology, the work of a single robot has been limited. Simultaneously, the development of the multi-robot cooperation has not been effectively resolved yet. In the background of wireless communication technology, the essay which is based on the in-depth analysis of infrared data transmission and theoretical wireless communications protocol combines the infrared communication technology with the robot automatic control technology and proposes the research design of the robot collective control system. The essay also builds a hardware platform which is used for researching the robot collective control system. In return, the communication protocol can be designed, the control program can be written and the performance of the system and be analyzed, which can represent that the research achievement can be obtained.
Study on Preparation and Photocatalytic Activity of Photocatalyst Made from Ti-Bearing Blast Furnace Slag
Authors: Gong Xiang Jun , Jia Feng , Liu Rong , Ye Fei , Guan Hao , Wang Rui , Guo Gang
Published: February 2014

Using the Ti-bearing blast furnace slag as raw materials, hydrochloric acid as treatment agents to prepare slag containing titanium catalysts. Slag containing titanium catalyst are characterized by XRD, SEM, FT-IR, UV-Vis/NIR and some other testing methods, and the results show that its main structure is mineral perovskite phase and it also has a strong absorption capacity in the UV region. With methyl orange solution as the target degradation, influence of the calcination temperature, catalyst dosage, initial concentration and pH of the solution on the photocatalytic effect of containing titanium slag catalyst are tested. The results show that when the heat treatment temperature is 400°C, catalyst dosage is 10mg and initial concentration is 10mg·L-1; when pH is 3, the photocatalytic effect is the best, the efficiency of which reaches 95%.
Analysis Model for Operation Strategies FTL of NG Distributed CCHP System Driven by Gas-Steam Combined Cycle in Rural Areas
Authors: Zhu Ke Ding , Yang Li Li , Zhang Hui Juan
Published: February 2014

Distributed combined cooling, heating and power (CCHP) system shows great advantages and provides new development space for energy construction of rural areas in China. Economic benefits are the most important factors determining the further development of distributed CCHP system in rural area and the operation strategies make a great impact on its economic benefits. This paper establishes an analysis model for the operation strategies following the thermal loads (FTL) of NG distributed CCHP system driven by gas-steam combined cycle. The prime mover used in this investigation is a gas-steam combined cycle based on combined gas turbines and steam turbines. The model presented in this paper can be used to determine the operation strategies of CCHP system under different daily periods: peak periods, flat periods, and valley periods in different seasons.
Decay Characteristic of Gallium Nitride Photocathode in a High Vacuum System
Authors: Fu Xiao Qian
Published: February 2014

The decay characteristics of the originally-activated GaN photocathode are explored by testing the change of quantum efficiency (QE).The QE after degradation for 9 hours can still keep more than 42% of the original value, and after reactivated with cesium, the QEs are almost recovered. The restorations of both the band bending and the ideal Cs/O ratio on the surface, along with the double dipole model are proposed to explain the QE variation of the GaN photocathode. Further exploration should include the roles played by the achievement of the maximum band bending of the GaN surface when deposited with Cs and its relationship with the surface Mg doping concentration.