Loading...

Table of Content

    25 October 2012, Volume 40 Issue 10
    Previous Issue    Next Issue
    Metal Oxide Thin Film Transistors and Their Application to Novel Display Technology
    Cao Yong Tao Hong Zou Jian-hua Xu Miao Lan Lin-feng Wang Lei Peng Jun-biao
    2012, 40(10):  1-11.  doi:1000-565X(2012)10-0001-11
    Asbtract ( 329 )   PDF (1148KB) ( 2285 )  
    Related Articles | Metrics

    In order to meet the requirements of novel display technologies such as high-resolution large-screen LCD and AMOLED,a novel active-matrix panel is developed. This novel active-matrix panel is based on the metal oxide thin film transistor ( MOTFT) with metal oxide semiconductor materials as the active layer. In this paper,the material,the structure of the device,the fabrication process and the application of MOTFT are expounded,and the factors that influence the MOTFT performance are discussed. Moreover,the relevant research results achieved by the research team are presented as follows: ( 1) the MOTFT reaches a mobility of 21. 6 cm2 /Vs at its highest,with a threshold voltage of 1. 63 V,a current on /off ratio of 109,and a sub-threshold swing of 0. 216 V/decade; ( 2) based on the MOTFT panel,the first 5-inch color AMOLED screen in China is developed; and ( 3) the MOTFT panel has the advantages of high mobility,simple fabrication process,and lower cost as well as greater ease in achieving large screen display. Therefore,it has wide application prospects in developing novel display technologies such as TFT-LCD and AMOLED.

    Architectural Design Theory and Practice Based on“Two Views and Three Features
    He Jing-tang
    2012, 40(10):  12-19.  doi:1000-565X(2012)10-0012-08
    Asbtract ( 282 )   PDF (2007KB) ( 1461 )  
    Related Articles | Metrics

    In view of the status quo of the architectural design field and according to the author’s years of practice,this paper puts forward and explains an architecture design theory of “ two views and three features”,which means that architectural design should adhere to the principles of“the holistic view”and“the sustainable development view”and reflect the harmony and unity of“the features of region,culture and times”. Moreover,this paper also analyzes a number of contemporary architectural design projects including the China National Pavilion at the Expo 2010 Shanghai China,which are designed by the author and his team under the guidance of this theory.

    Flow and Simulation of Pulp Fiber Suspensions
    Chen Ke-fu Zeng Jin-song Feng Yu-cheng Li Jun
    2012, 40(10):  20-27.  doi:1000-565X(2012)10-0020-08
    Asbtract ( 376 )   PDF (727KB) ( 1050 )  
    Related Articles | Metrics

    Flow dynamics of pulp fiber suspensions can be used to describe the flow and forming processes of a modern paper machine and provide a theoretical basis for the optimization design of papermaking process and equipment. In this paper,the characteristics,model and simulation method of pulp fiber suspensions are introduced,and the relevant measurement techniques are expounded. Then,a flow dynamics is proposed to investigate multiphase flow-pulp fiber suspensions by combining new measurement techniques with advanced software. Moreover,the recent theoretical research results in the field,which are achieved by the authors and their team and entitled "Investigation into Flow and Simulation of Pulp Fiber Suspensions in Various Models and PIV Measurement Technique”,are specially presented. Finally,this paper elaborates on the applications of the above-mentioned theoretical results to the structure optimization of the head box and forming device during the process of developing a domestic high-speed paper machine.

    Frontiers of Architectural and Environmental Acoustics
    Wu Shuo-xian Zhao Yue-zhe
    2012, 40(10):  28-31.  doi:1000-565X(2012)10-0028-04
    Asbtract ( 288 )   PDF (387KB) ( 1263 )  
    Related Articles | Metrics

    The research purpose of architectural and environmental acoustics is to maintain a pleasant acoustic environment for human habitation and show solicitude for the auditory perception of human beings,so that they can enjoy music and other pleasant sound and shield off or reduce the disturbance of noise and vibration. A good acoustic living environment is an important precondition for ensuring human health and improving productivity and working efficiency as well as for benefiting thinking and study. This paper systematically introduces the research area,content and situation of architectural and environmental acoustics and its three main branches,namely,auditorium acoustics,noise control and soundscape,and presents some frontiers and hot points which must be noticed in the field of architectural and environmental acoustics. Meanwhile,some important research works completed by the authors and their team in this field are also described.

    Creative Research Progress of Polymer Processing Technology
    Qu Jin-ping Zhang Gui-zhen Yin Xiao-chun Feng Yan-hong He He-zhi Jin Gang Yang Zhi-tao
    2012, 40(10):  32-42.  doi:1000-565X(2012)10-0032-011
    Asbtract ( 244 )   PDF (2530KB) ( 1112 )  
    Related Articles | Metrics

    In order to meet the requirements of reducing processing energy consumption,recycling waste polymers and making use of renewable resources in polymer industry,this paper proposes and investigates a elongation rheology-based polymer deformation processing method and a corresponding technology based on the vibration-shear deformation processing method and equipment,focusing on the plasticating and conveying process,technical characteristics and mixing characteristics of the vane extruder dominated by tensile deformation. It is found that,as compared with the conventional screw plasticating and conveying technology and equipment,the new technology and its equipment show many outstanding advantages,such as shorter thermo-mechanical history,lower energy consumption,better mixing effects,wider material adaptability and higher product quality; and that it has a significant advantage in processing material systems,such as multiphase and multicomponent composites,polymer /biomass composites,etc.

    Fabrication of Biomedical Titanium Alloys with High Strength and Low Modulus by Means of Powder Metallurgy
    Li Yuan-yuan Zou Li-ming Yang Chao
    2012, 40(10):  43-50.  doi:1000-565X(2012)10-0043-08
    Asbtract ( 357 )   PDF (1497KB) ( 1091 )  
    Related Articles | Metrics

    In order to explore an effective method to fabricate biomedical Ti alloy with high strength and low modulus,amorphous /nanocrystallized ( Ti69. 7Nb23. 7Zr4. 9Ta1. 7 ) 100 －xFex alloy powders with different Fe contents were synthesized via mechanical alloying,and,subsequently,ultrafine-grained Ti-based composites with high strength and low modulus were fabricated via the spark plasma sintering-amorphous crystallization. The results show that,during the performed mechanical alloying,Fe content significantly affects the glass-forming ability of the alloy system,concretely,fully amorphous structure forms only when x reaches 10; and that Fe content also has an obvious effect on the mechanical properties of the bulk composites,only the bulk composite at a x value of 6 possesses high strength and distinct plasticity,with the corresponding compressive yield stress,fracture stress and fracture strain respectively being 2425MPa,2650MPa and 0. 0691,and with an average elastic modulus of 52 GPa that is close to the minimum of the third-generation biomedical Ti alloys. Moreover,by comparing the friction and wear properties of the fabricated composites with those of two kinds of conventional biomedical Ti alloys ( Ti69. 7Nb23. 7Zr4. 9Ta1. 7 ) 94Fe6,it is found that the fabricated composites are of the best wear resistance.

    Biomimetic Artificial Bone Repair Materials: a Review
    Wang Ying-jun Du Chang Zhao Na-ru Ye Jian-dong Chen Xiao-feng
    2012, 40(10):  51-58.  doi:1000-565X(2012)10-0051-08
    Asbtract ( 421 )   PDF (764KB) ( 2091 )  
    Related Articles | Metrics

    The bone repair material is one of the biomedical materials with the highest clinical demand. Owing to the limitations of autograft and allograft transplantation,the development of advanced artificial bone repair materials proves to be of great significance. Novel biomimetic artificial bone repair materials can be produced by mimicking the composition and structure characteristics of natural bone and its biomineralization to design and regulate the composition and structure of the material,which has become one of the major trends in the development of biomaterials. This paper summarizes the research progress of the biomimetic artificial bone repair materials,with the focus on the authors'studies on the biomimetic synthesis of bone-like nanoscale calcium phosphate minerals,the fabrication of biomedical polymeric biomimetic nanofibrous scaffold,and the construction of the self-setting calcium phosphate cements-based bone repair materials with biomimetic porous structure.

    Applications of Modern Optical Imaging Technologies for Rapid Quality Inspection of Food Products
    Sun Da-Wen Wu Di He Hong-ju Feng Yao-ze
    2012, 40(10):  59-68.  doi:1000-565X(2012)10-0059-10
    Asbtract ( 335 )   PDF (1102KB) ( 1661 )  
    Related Articles | Metrics

    In order to meet the consumers’demands on the quality and safety of food products,it is required to apply rapid and non-invasive inspection during production and processing of food products in the modern food industry. The quality and safety issues of food products in China have raised a high attention of the whole society in recent years. By acquiring the images of food products in different spectral ranges,modern optical imaging techniques use digital image processing algorithms to extract feature information from digital images of food products and establish quantitative relationships between features and quality attributes of the products,resulting in realizing rapid,non-invasive,efficient,and low-cost assessment of food products and providing information support to automatic sorting and grading management,and to quality inspection in modern food process operations. Food Refrigeration &Computerised Food Technology ( FRCFT) in University College Dublin ( UCD) led by Professor Da-Wen Sun has carried out a series of research works on applying the advanced optical imaging techniques including computer vision and hyperspectral imaging to determine food quality in a rapid and non-invasive way. Their leading research works are well recognized by their international peers. This paper reviews the research results of UCD-FRCFT on food quality inspection using computer vision and hyperspectral imaging in the past decade.

    Progress and Development Orientation in Fundamental Researches on Functionalization-Based Rational Design and Manufacture of Health Food
    Li Lin Li Xiao-xi Chen Ling Yang Xiao-quan Liu Guo-qin
    2012, 40(10):  69-76.  doi:1000-565X(2012)10-0069-08
    Asbtract ( 348 )   PDF (1230KB) ( 1090 )  
    Related Articles | Metrics

    Based on the academic connotation of the processing factors in the health food production and the microstructure,macroscopic properties of such important food components as starches,proteins,oil,etc.,this paper summarizes four key essential scientific problems on the relationships among the microstructure changes of phase state,aggregation and molecular chain structure and the macroscopic properties of the health food. Then,the research progress in this frontier of food science both at home and abroad is comprehensively reviewed,and the future research development trends are pointed out. The solution to these essential scientific problems provides important theoretical support for the functional rational design and manufacture of the health food.

    Molecular Configuration Fitting of Sodium Lignosulfonate in Aqueous Solution
    Qiu Xue-qing Qian Yong Guo Yun-qing Deng Yong-hong
    2012, 40(10):  77-82.  doi:1000-565X(2012)10-0077-06
    Asbtract ( 312 )   PDF (941KB) ( 1242 )  
    Related Articles | Metrics

    First,sodium lignosulfonate ( NaLS) was purified and fractionated through filtering and gel chromatography. Next,the absolute molecular mass of NaLS was determined by means of the static light scattering,and enough salt was added to eliminate the influence of the slow mode on the determination. Then,the diffusion coefficients of NaLS molecules at different temperatures were measured by means of the dynamic light scattering. Based on the obtained absolute molecular mass and diffusion coefficients,the fitting calculation of the ellipsoid structures of NaLS molecules at different temperatures was carried out by using Perrin formula. The results show that the absolute molecular mass of NaLS obtained through the light scattering methods is larger than that measured via gel permeation chromatography ( GPC) and it is closer to its real molecular mass; and that,with the increase of the temperature,the diffusion coefficient of NaLS molecules increases,indicating that the Brownian motion is accelerated. Fitting results obtained through Perrin formula demonstrate that the structures of NaLS molecules at different temperatures are all disk-like oblate ellipsoids with ratios of the length of longer axis to that of shorter more than 7.5,and they become more oblate when the solution temperature increases. In addition,the ellipsoid models of NaLS molecules at different temperatures were constructed by combining the results in this paper with the existing ones in the literature.

    Source Control and Remediation of Environmental Contamination in Metal Sulfide Mine Areas
    Dang Zhi Lu Gui-ning Yang Chen Yi Xiao-yun Guo Chu-ling
    2012, 40(10):  83-89.  doi:1000-565X(2012)10-0083-07
    Asbtract ( 243 )   PDF (653KB) ( 1276 )  
    Related Articles | Metrics

    The natural weathering of mine tailings in metal sulfide mine areas can generate and release huge amounts of acid mine drainage ( AMD) containing heavy metals and sulfate ions,which may result in serious contamination of local and downstream environment of water and soils. In this paper,the relevant researches completed by the authors and their team are introduced as follows: ( 1) based on the chemical and microbial oxidation mechanisms of the mine tailings,sustained-release bactericides were developed to inhibit microbial oxidation and several passivators such as sodium triethylenetetramine-bisdithiocarbamate were produced to cut off the contact between the tailings and the air,water and microbes so as to inhibit the oxidation of the tailings,thus controlling the release of heavy metals and sulfate ions from the source; ( 2) in view of the fact that the heavy metal and sulfate contamination of the surrounding environment in mine areas is caused mainly by means of water migration,absorbent materials from modified maize straw,peanut shells and rice straw were developed to remove heavy metals and sulfate ions from AMD and a biochemical function material capable of simultaneously removing heavy metals and sulfate ions was built by immobilizing sulfate-reducing bacteria onto modified absorbent materials; and ( 3) a technique by the name of“production simultaneously with remediation”was devised,which adopts the economic crop of corn to remediate contaminated soils,thus realizing soil remediation simultaneously with agricultural production.

    Analyses of Wind-Induced Vibration Response of Suspended Dome Structures
    Wei De-min Liu Ya-qing
    2012, 40(10):  90-95.  doi:1000-565X(2012)10-0090-06
    Asbtract ( 275 )   PDF (1336KB) ( 794 )  
    Related Articles | Metrics

    In view of the influences of the wind direction and the horizontal fluctuating wind speed spectrum on the computational results of structural response,the complete quadratic combination( CQC) method is used to conduct the frequency domain analysis for the wind-induced vibration response of a practical long-span suspended dome roof structure,thus obtaining the wind vibration coefficients of the suspended dome in different wind directions. Then,the effect of the number of the vibration modes on the computational results of the structural response is investigated,and the computational results of the wind-induced vibration response for Davenport’s wind speed spectrum and other four spectrums are compared. The results of the analyses show that ( 1) the most sensitive wind directions of different parts of the structure are different,specifically,it is 45° for the center part of the structure and 0° for the remaining area except the cantilever part; ( 2) all parts of the structure are least sensitive to the wind direction of 90°; ( 3) the distribution of the wind-induced vibration coefficient of the internal force is more uniform than that of the displacement; and ( 4) the number of the vibration modes obviously affects the computational results of the practical structure response and it is,therefore,suggested to be more than 100. In addition,Harris’s wind speed spectrum is not suitable for the frequency domain analysis of the wind-induced vibration response of the long-span structure.

    New Singular Solutions of KdV and mKdV Equations
    Liu Zheng-rong Tang Hao
    2012, 40(10):  96-101.  doi:1000-565X(2012)10-0096-06
    Asbtract ( 201 )   PDF (878KB) ( 575 )  
    Related Articles | Metrics

    This paper deals with the singular solutions of the famous KdV and mKdV equations. In the investigation,first,the corresponding planar systems of these equations are established. Then,through some special orbits of the corresponding planar systems,some new singular solutions of these equations are obtained. Finally,by employing the singular solutions of the mKdV equation and the Miura transformations,other singular solutions of the KdV equation are presented.

    General Decay Stability of Stochastic Differential Equations with Markovian Switching
    Deng Fei-qi Kuang Shi-fang Zhao Xue-yan
    2012, 40(10):  102-108.  doi:1000-565X(2012)10-0102-07
    Asbtract ( 294 )   PDF (750KB) ( 587 )  
    Related Articles | Metrics

    It is worth pointing out that some stochastic systems are indeed stable but subject to a certain lower decay rate which is different from exponential decay,such as polynomial or logarithmic. For more accurate quantitative analyses of stability properties,this paper extends the usual exponential stability concepts to a more general stable decay function and investigates the general decay stability of stochastic differential equations with Markovian switching. Firstly,some φ( t) -stability criteria in p-th moment and almost surely sense for the analytical solutions are established,by utilizing ItÔ formula,Borel-Cantelli and martingale exponential inequalities. Then the Euler Maruyama method is shown to be effective in capturing φ( t) -stability behavior for all sufficiently small timesteps under appropriate conditions.

    Friction Model Based on Real Contact Area
    Huang Ping Lai Tian-mao
    2012, 40(10):  109-114.  doi:1000-565X(2012)10-0109-06
    Asbtract ( 243 )   PDF (948KB) ( 2114 )  
    Related Articles | Metrics

    In this paper,the existing problems with the frictional coefficient in the classical friction theory are analyzed. In order to solve these problems,a frictional micro volume is established based on the theories of elasticity and plasticity,and three assumptions are thus proposed as follows: ( 1) the friction is proportional to the real contact area; ( 2) the frictional shear stress is independent of the normal stress; and ( 3) there is no abrasion or wear. Then,the friction model is constructed based on the real contact area and is employed to analyze the friction problems with the equal-height roughness and the random roughness as well as under extreme conditions. The results show that the proposed model is significantly different from the classical friction coefficient method; and that it reflects the origin of interfacial friction and can be used to effectively solve different friction problems.

    Effects of Ultrasonic Waves on Mass Transfer Enhancement in Absorption Refrigeration System
    Tang Yong Han Xiao-dong Chen Chuan Fu Ting Ge Zi-ping
    2012, 40(10):  115-120.  doi:1000-565X(2012)10-0115-06
    Asbtract ( 355 )   PDF (1217KB) ( 1127 )  
    Related Articles | Metrics

    In this paper,the effects of ultrasonic waves on the mass transfer of the cryogen water in LiBr solution that acts as the working medium in an absorption refrigeration system were investigated. The results indicate that ( 1) ultrasonic waves obviously enhance the mass transfer of the cryogen water; ( 2) the enhancement is strongest at the intial phase,and then it gradually weakens and tends to be stable as the system becomes balanced; ( 3) in the refrigeration system with 50% LiBr solution as the working medium and with an initial pressure of 800 Pa,the transferring intensification rate is more than 20% when the heat source temperature is kept at 65 ～80℃, and it increases significantly with the decrease of the heat resource temperature; ( 4) the method of applying ultrasonic waves to the mass transfer enhancement can effectively improve the refrigeneration efficiency of the LiBr absorption refrigerator driven by low-temperature heat resources and can reduce the lowest temperature of heat source water for the refrigeration system without affecting the stable operation of the system; and ( 5) the propsed method is suitable for the solar absorption refrigeration system driven by low-temperature hot water and is capable of improving the refrigeration performance of solar air-conditioning.

    A Novel N-Doped Carbon-Based Metal-Free Catalyst Prepared and Its Oxygen Reduction Performance
    Liao Shi-jun Peng Hong-liang Zhang Bing-qing
    2012, 40(10):  121-127.  doi:1000-565X(2012)10-0121-07
    Asbtract ( 232 )   PDF (1959KB) ( 1662 )  
    Related Articles | Metrics

    In Ar atmosphere,a novel N-doped carbon-based metal-free catalyst for the cathodic oxygen reduction reaction ( ORR) in fuel cells was prepared via the high-temperature carbonization of the hybrid precursors of melamine and polyaniline. Then,the effects of such factors as the precursors and the carbonization temperature on the catalyst performance were discussed,and the catalyst was characterized by means of XRD,TEM,DSC-TGA,Raman spectroscopy and FT-IR. The results show that ( 1) the optimal carbonization temperature is 900℃; ( 2) the process with the pyrolysis twice and with the acid treatment once benefits the enhancement of the catalyst activity; and ( 3) the catalyst is of excellent electrochemical activity and stability in the electrolyte with 0.1 mol /L of HClO4,that is.after 10000 voltammetry circles,its electrochemical activity does not decrease but increases,with a half-wave potential of ORR of 0.42 V ( vs.Ag /AgCl) and a limited diffusion current nearly equal to that of the state-of-the-art Pt /C catalyst. In addition,it is found from Koutecky-Levich plots that the oxygen reduction on the catalyst is controlled by the four-electron transfer mechanism.

    Antiaging Effect of Vitamin C-Rare Earth Complex on Natural Rubber /Carbon Black Composites
    Luo Yuan-fang Yang Chao Jia Zhi-xin Jia De-min Chen Jun Zheng De
    2012, 40(10):  128-133.  doi:1000-565X(2012)10-0128-06
    Asbtract ( 326 )   PDF (1474KB) ( 756 )  
    Related Articles | Metrics

    A novel rare earth complex was prepared from lanthanum ( La) and vitamin C and was used as a new type of antioxidant in natural rubber /carbon black ( NR/CB) composites. Then,the effects of the vitamin C-rare earth complex on the curing characteristics of NR/CB compounds and the mechanical properties of NR/CB vulcanizates were investigated. Moreover,by means of FT-IR and according to the retention of mechanical properties and the variation of surface morphology,the effects of the rare earth complex on the antiaging properties of the NR/CB vulcanizates were also analyzed in detail and were compared with those of the commonly-used rubber antioxidants 4010NA,RD and MB. The results show that ( 1) the rare earth complex can accelerate the vulcanization of the NR/ CB compounds to a certain degree and improve the mechanical properties of the NR/CB vulcanizates; ( 2) the rare earth complex has a good antiaging effect on the NR/CB vulcanizates; ( 3) the thermo-oxidative aging resistance and UV aging resistance of the rare earth complex are close to those of 4010NA and RD and are superior to those of MB; and ( 4) the ozone aging resistance of the rare earth complex is particularly strong for the NR/CB vulcanizates,which is superior to those of RD and MB as well as to those of 4010NA with an excellent ozone aging resistance.

    Synthesis of Cationic Imidazoline Corrosion Inhibitor and Its Corrosion Inhibition Performance
    Yu Qi-jun Fei Fei-long Wei Jiang-xiong Hu Jie Ai Zhi-yong
    2012, 40(10):  134-141.  doi:1000-565X(2012)10-0134-08
    Asbtract ( 297 )   PDF (1450KB) ( 840 )  
    References | Related Articles | Metrics

    Cationic imidazoline quaternary-ammonium-salt was synthesized as a corrosion inhibitor of reinforced concrete by means of the molecular structure design. Then,its molecular structure and corrosion inhibition performance on the steel reinforcement in the simulated concrete pore solution with 3.5% of NaCl were characterized,and the corresponding corrosion inhibition mechanism was preliminarily discussed. The results indicate that ( 1) the synthesized product is consistent with the designed molecular structure,and the corresponding yield is up to 95%; ( 2) the synthesized imidazoline quaternary-ammonium-salt is a cationic corrosion inhibitor with a good inhibition effect on the corrosion of steel reinforcement in the simulated concrete pore solution,specifically,the corrosion inhibition effect of the salt with a dosage of 1. 0% is slightly inferior to that of the inorganic corrosion inhibitor sodium nitrite with a dosage of 2. 0%,while that of the salt with a dosage of 2. 0% is superior to that of the alcohol-amine organic corrosion inhibitors with the same dosage; ( 3) the salt with a dosage of 1. 0% displays a better corrosion inhibition effect in the early and middle stages ( 1,7,14 d) ,while the salt with a dosage of 2. 0% does after 28 days; and ( 4) the corrosion inhibition mechanism of the salt can be described as the adsorption and film-forming on the steel surface and the inhibition of the cathodic reaction of the steel reinforcement.

    On Multifractal Analysis of Measures
    Wu Min
    2012, 40(10):  142-145.  doi:1000-565X(2012)10-0142-04
    Asbtract ( 281 )   PDF (638KB) ( 955 )  
    Related Articles | Metrics

    Multifractal analysis of measures is known as an important research direction of fractal geometry. It has been widely used in dynamical systems,turbulence analysis,rainfall modeling,earthquake analysis,and financial time series modeling. Developing the mathematical theory and methods of multifractal measures is of utmost importance.This paper briefly explains the basic ideas and methods of the multifractal analysis of measures and describes the author's major findings and achievements in this field.

    Effects of CO2 Flow Rate on Morphology and Adsorption Capacity of CaCO3
    Yu Shu-juan Yu Pei Fu Xiong Pan Run-quan Zhao Yi
    2012, 40(10):  146-151.  doi:1000-565X(2012)10-0146-06
    Asbtract ( 402 )   PDF (1566KB) ( 624 )  
    Related Articles | Metrics

    In order to study the factors that influence the adsorption of non-sugar by calcium carbonate during the process of carbonation in multi-component syrup and to clarify the effects of CO2 flow rates on CaCO3 particles,the morphologies,formation rate and sizes of the CaCO3 particles were characterized by means of SEM and FBRM. Moreover,the color value,the content of reducing sugar and the apparent purity were determined as the indexes. Experimental results show that ( 1) the CaCO3 particles are cube-shaped at a lower CO2 flow rate while they are rod-like at a higher flow rate; ( 2) the CaCO3 particle chord lengths obtained by using an on-line FBRM are within a range of 1 ～ 100 μm,and the range becomes wider with the increase of the CO2 flow rate; ( 3) fast carbonation can protect the reducing sugar from destruction; ( 4) when the CO2 content is constant,with the increase of the CO2 flow rate,the color value of clarified juice decreases while the corresponding apparent purity improves; ( 5) the CO2 flow rate has little influence on the adsorption of the inorganic cations of K + ,Na + ,Ca2 + and Mg2 + ; and ( 6) within an appropriate flow rate range of 300~900mL /min,fast carbonation proves to be a feasible clarification technology.

    Characteristic Analysis of Magnetic Resonant Coupling-Based Wireless Power Transfer System with Two Receivers
    Zhang Bo Zhang Qing
    2012, 40(10):  152-158.  doi:1000-565X(2012)10-0152-07
    Asbtract ( 204 )   PDF (2421KB) ( 1248 )  
    Related Articles | Metrics

    In this paper,a model of the magnetic resonant coupling-based wireless power transfer system with two receivers is constructed. Thus,the expressions of the transfer power and efficiency of the system are deduced. The operation characteristics of the system are analyzed by considering the relative positions of the transmitter and the two receivers,and the corresponding experiments are carried out,thus verifying the correctness of the model and characteristic analyses. It is found that the extreme points of the output power and efficiency of the system with the two receivers placed on the same side of the transmitter are both different from those on the different sides,and that they occur at a resonant frequency on the same side,but not on the different side. The findings provide a theoretical basis for the optimization design of the system.

    Application of a New Laser-Spectroscopy-Based Technology to Boiler Diagnosis of Power Stations
    Lu Ji-dong Yao Shun-chun Dong Mei-rong Zheng Jian-ping
    2012, 40(10):  159-165.  doi:1000-565X(2012)10-0159-07
    Asbtract ( 395 )   PDF (1225KB) ( 673 )  
    Related Articles | Metrics

    With the rapid development of the electric power industry and the great changes in the power consumption structure,the utility boiler encounters many adverse factors,such as the complication of coal characteristics and the large-scale changes in the generation load,which directly affect the safety and economy of the boiler operation. The lack of the online measurement technology for the boiler units of coal-fired power plants has become one of bottleneck problems that limit the development of the optimal operation of the thermal power technology. In this paper,a new laser-spectroscopy-based technology named as LIBS ( Laser-Induced Breakdown Spectroscopy) is introduced into the boiler diagnosis of power stations,and the relevant researches implemented by the authors and their co-workers are reviewed in terms of the coal quality,the unburned carbon of fly ash,and the failure trend of heat exchange surface. Moreover,the development orientation of LIBS in the boiler diagnosis of power stations is also discussed.

    Basic Methods of Digital Image Technology for Material Structure of Asphalt Mixtures
    Zhang Xiao-ning
    2012, 40(10):  166-173.  doi:1000-565X(2012)10-0166-08
    Asbtract ( 289 )   PDF (2012KB) ( 1333 )  
    Related Articles | Metrics

    For asphalt mixtures,the digital image technology has been used to obtain the internal structure,analyze the volume parameters and complete the computer-assisted design. These aspects have been hot research topics in the asphalt pavement technology area. In this paper,the relevant research results achieved by the author and his team are introduced,focusing on: ( 1) the statistics of the volumetric component of asphalt mixtures,the identification of the different components of asphalt mixtures and the extraction of the morphological characteristics of coarse aggregates,which are all based on the 2D digital image technology; ( 2) the 3D reconstruction of the internal structure of asphalt mixtures; and ( 3) the virtual mechanics test method. Meanwhile,the cases for the industrial applications of these research results are presented.

    Regeneration Structural Members Containing Large-Size Demolished Concrete: a Review
    Wu Bo Zhao Xin-yu Yang Yong
    2012, 40(10):  174-183.  doi:1000-565X(2012)10-0174-10
    Asbtract ( 387 )   PDF (1106KB) ( 838 )  
    Related Articles | Metrics

    In order to simplify the recycling process of demolished concrete,the authors and their team have proposed the concept of the regeneration structural members containing the demolished concrete with a significantly larger size than those of conventional recycled aggregates. In the proposed structural members,the recycling of the demolished
    concrete is promoted from an aggregate level of not more than 40 mm to a distinctly larger size level of 50 ～ 300mm for the demolished concrete blocks ( DCBs) or of more than 500mm in the length direction for the demolished concrete segments ( DCSs) . This paper presents a brief review of the studies conducted by the authors and their team on the proposed structural members in recent years,and introduces preliminary engineering applications of these members to real-life structures. Moreover,the research and development orientation of the proposed structural members is pointed out. The results of the studies and applications indicate that ( 1) the method of recycling demolished concrete through the proposed members not only simplifies the tedious production process of the recycled aggregates but also reduces the corresponding secondary energy consumption,so the method is more economical than that of using the recycled aggregates; ( 2) the fundamental properties and seismic performance of the proposed members are close to or slightly inferior to those of the counterpart members made only from cast-in-situ concrete; ( 3) based on the concept of the combined strength of the new and old concrete used in the proposed members,the formulas specified in current design codes for members made only from cast-in-situ concrete can be applied to the proposed members directly or after a slight modification; and ( 4) applying the proposed structural members,especially the thin-walled steel-concrete composite members containing large-size demolished concrete,to practical engineering is feasible and dependable,so it is an effective approach to the demolished concrete recycling.

    Fatigue Behavior of CFRP-Concrete Interface
    2012, 40(10):  184-189.  doi:1000-565X(2012)10-0184-06
    Asbtract ( 315 )   PDF (1801KB) ( 848 )  
    Related Articles | Metrics

    In order to verify the fatigue resistance performance of the CFRP( Corbon Fiber Reinforced Plastic) - concrete interface,the bonded interface is taken as the research objective and the double-shear fatigue specimens are designed to test the fatigue performance of the CFL ( Carbon Fiber Laminate) -concrete interface under cyclic loading. Then,the relative slip evolution curves ( the relative slip of the specimen-fatigue life experimental curves) of the CFL-concrete interface are presented,and its strain and bond-slip laws are analyzed. The experimental results show that ( 1) under the fatigue load,the strain evolution on the CFL consists mainly of three steps of force transmission,namely,the early rapid step,the stable step and the instable step,in which the stable force transmission step accounts for 95% of the whole process; ( 2) the relative slip evolution of the specimens is also divided
    into three steps,namely,the early rapid growth step,the stable growth step and the instable growth step; and ( 3) at the stable growth step,there exists a near-linear relationship between the relative slip of the specimen and the fatigue life. Finally,a fatigue damage model of the CFL-concrete interface is proposed based on the stiffness coefficient. By using this model,the damage evolution law of the CFL-concrete interface in the fatigue process can be conveniently derived.

    Research Progress of Fatigue Reliability and Damage Identification of Compliant Mechanisms
    Zhang Xian-min Wang Qi-liang
    2012, 40(10):  190-197.  doi:1000-565X(2012)10-0190-08
    Asbtract ( 278 )   PDF (1125KB) ( 1035 )  
    Related Articles | Metrics

    As compliant mechanisms transfer motion and force relying on elastic deformation,fatigue becomes the main failure mode of the mechanisms. Therefore,further researches on the fatigue properties and the design against fatigue are necessary for compliant mechanisms. In this paper,based on the research results of the authors and their team,the main design methods of compliant mechanisms are briefly described. Then,through a review of the three main fatigue life prediction approaches,namely,the nominal stress approach, the local stress-strain approach and the stress field intensity approach,the authors introduce the models of fatigue life prediction for right circular flexure hinges and leaf flexure hinges,with emphasis on the effects of size parameters of hinges on the fatigue life. Moreover,several analysis and optimization design methods of compliant mechanisms,as well as the damage identification approach based on the eigenparameter decomposition,are included in this article. The research orientation of the fatigue reliability and damage identification of compliant mechanisms is finally pointed out.

    Robust Distributed Estimation in Wireless Sensor Networks
    Xu Bu-gong Liu Gui-yun
    2012, 40(10):  198-202.  doi:1000-565X(2012)10-0198-05
    Asbtract ( 257 )   PDF (892KB) ( 882 )  
    Related Articles | Metrics

    In view of both the pollution distribution of the sensor observation noise and the noise in the communication channels in a wireless sensor network,two novel robust distributed estimation schemes,namely,QME and TME,are proposed in this paper. Then,the performances of the two proposed schemes are verified by a simulation and are compared with those of the MLE scheme with the known noise covariance. The results show that the QME scheme is superior to the TME scheme and the MLE scheme with the known noise covariance in terms of estimation performance; and that the QME and TME schemes asymptotically achieve the CRLB with the increase in the number of sensor nodes.

    Theoretical Research on Blow Molding and Development of Equipment and Key Technologies of High Performance and Low Energy Consumption
    Huang Han-xiong Huang Geng-qun Li Jiong-cheng Wang Quan-jie Li Wei-ping Xiao Cheng-long Huang You-fa
    2012, 40(10):  203-210.  doi:1000-565X(2012)10-0203-08
    Asbtract ( 304 )   PDF (1564KB) ( 711 )  
    Related Articles | Metrics

    In this paper,the theoretical researches on polymer blow molding carried out in our team are summarized in terms of the modeling and simulation of the three stages during the blow molding ( namely,parison formation,parison inflation,and part cooling) and the control strategy of blow-molded part thickness. Then,four kinds of blow molded machines and key technologies with proprietary intellectual property rights,which were developed based on the theoretical researches,are emphatically analyzed. They are the air-traction three-dimensional blowmolding machine and technology,the intelligent control system and technology for the blow-molded part thickness,the key system and technology of the electrically-driven blow-molding machine,and the fast thermal cycling system and optimization for blow mold. Finally,the four blow molded machines and key technologies are integrated,thus saving the energy and material in the process of the blow molding of complex industrial parts.

    Molecular Dynamic Simulation on Interaction of Antimicrobial Peptide HP( 2-20) and POPE Lipid Membrane
    Wu Jian-hua Liu Li Fang Ying Huang Qing-sheng
    2012, 40(10):  211-218.  doi:1000-565X(2012)10-0211-08
    Asbtract ( 284 )   PDF (1365KB) ( 1039 )  
    Related Articles | Metrics

    As one of the most likely substitutes for conventional antibiotics,antimicrobial peptides ( AMPs) are ancient players in innate immunity. In the antimicrobial action of AMPs,an initial key event is that AMPs firstly contact with and then closely adhere to the bacterial membrane. In order to reveal this unknown process,a molecular dynamic ( MD) simulation is performed to examine the nonspecific interaction of AMP HP( 2-20) with the cell membrane,which is modeled by a POPE bilayer. The results show that the N-terminal of the peptide firstly contacts with the membrane,and then,companying with a rotation movement,the peptide slowly inclines toward and slightly inserts into the membrane; at the same time,the AMP limits the movements of the lipids adjacent to the peptide,which induces the membrane to become non-uniform and enhances the irregular fluctuation of the lipids, so that other peptides may find their chances of deeply inserting into the membrane.

    Multiband Bandpass Filter Technologies
    2012, 40(10):  219-226. 
    Asbtract ( 179 )   PDF (1830KB) ( 937 )  
    Related Articles | Metrics
News
 
More>>
Featured Article
More>>
Most Read
More>>
Most Download
More>>
Most Cited
More>>
Links
More>>