bluuebunny/crossref_metadata_2025 huggingface dataset:
The Application of Geometric Elements in Modern Product Design
Authors: Yang Mei , Bo Qi Fang , Zhang Xin
Published: October 2011

Geometric shape is favored by designers of ideas and becomes the language of art which is never fade by its fade structures, crisp lines and simple descriptions. Product design covers all aspects of the society, and reflects the opinion of a nation’s culture values. The concept of geometric shape is in a field which is close to modern society and culture. This paper firstly analyses how geometric element reflects its aesthetic feeling and intrinsic value from the view of form. Then, the geometric shape modeling method in modern product design is presented to improve the cognitive ability and acquire the infinite power of expression and creation. In the end, a home cordless telephone is designed based on geometric shape, which is a perfect explanation of life and sensation.
Experimental Study on the Process of the Three-Dimensional Rock Crack Growth Influenced by the Pre-Crack Profile Geometry
Authors: Yan Dong , Kang Yong Jun , Zhang Dan , Ma Shao Peng
Published: October 2011

The difference of the pre-crack profile geometry could have a certain influence on the surface crack growth in rock materials. In this paper, an experimental study on the failure process of rock specimen with a non-penetrated crack in two different profiles is performed. Profile of the pre-crack on the specimen type I is trapezoidal and profile of the pre-crack on the specimen type II is arc. The surface crack growth of the two types of specimen is analyzed and compared in detail by using the digital speckle correlation measurement (DSCM) techniques and the virtual extensometer (VE) based on DSCM. The results indicate that the extension mode of the main crack on the two types of specimen depends on the pre-crack profiles of different geometry. The cross-section with continuous profile (specimen I) has a fixed propagation direction and a much higher growth speed compared to the cross-section with discontinuous profile (specimen II).
Measurement of Permittivity of Ferroelectrics Using Coaxial Resonator
Authors: Tan Biao , Su Shu Bing
Published: October 2011

This paper presents a coaxial resonator technique applied for the measurement of the permittivity of ferroelectric thick film. A 1/4-wavelength coaxial resonator with appropriate dimensions were designed and made for measurements so that there is only TEM fundamental resonance in the interest frequency range. The permittivity may be extracted from the measured TEM fundamental resonant frequency in the resonator. The equivalent capacitance to the part between sample and open end of coaxial line is discussed, in which the boundary element numerical method was used for modeling the capacitance. The resonant frequency was measured using network analyzer and good experimental results were obtained.
Optimization of Lug Design Based on Damage Tolerance Analysis
Authors: Yin Zhi Ping , Li Guo Feng , Huang Qi Qing , Zhang Jiong , Xu Ming Bo
Published: October 2011

Lugs are numerous in aircraft and most of them are key structures in aircraft, in which fracture break occurs frequently. It is necessary to improve the fatigue life level of the lugs. In this thesis, the genetic algorithm is used to optimize the crack propagation life of the lugs with or without interference bushes. The curves of optimization results with different safety margin are gained, which can guide the damage tolerance design of the lugs in engineering.
Theoretical Study on Stability of the Separable Elliptic Ultrasonic Vibration Cutting Process
Authors: Li Hua , Song Ke Feng , Yin Zhen , Cao Zi Yang
Published: October 2011

By kinematics and dynamics analysis of the separate elliptic ultrasonic vibration cutting process, the mechanism of elliptic ultrasonic vibration on cutting process is revealed, and the physical essence of improving the stability of cutting process is clarified.
Particle Swarm Optimization for Cylinder Helical Gear Multi-Objective Design Problems
Authors: Mo Yuan Bin
Published: October 2011

The models for many problems in cylinder helical gear design are all multi-objective optimization. But there isn’t an effective algorithm for solving multi-objective optimization, and now the only method for it is changing multi-objective into one objective by weighted average. In this paper a novel multi-objective optimization method based on Particle Swarm Optimization (PSO) algorithm is designed for applying to solve this kind of problem. A paradigm depicted in the paper shows the algorithm is practical.
A Low-Power High Linearity Gm-C Filter
Authors: Hu Hui Yong , Sun Liu , Zhang He Ming , Song Jian Jun
Published: October 2011

A low-power, high linearity Gm-C filter is presented and designed.The input transistors of Gm is biased in linear region, and drain-source voltage is constant through feedback loop. The filter is designed in SMIC 0.18μm Mixed Signal CMOS PDK (Process Design Kit) with cutoff frequency 15.74 MHz, Passband ripple less than 0.2dB,while dissipating 2.5mW. It can be used as Baseband filter in RF system.
Simulation Study on the Heavy Parts of Pipe Hydrostatic Tester and their Structures Optimization
Authors: Gu Rui Jie , Liu Ji Gao , Zhang Jian Gong , Li Pei Li , Kou Yong Le , Liu Hui Chao
Published: October 2011

The FE models of the front beam and the moving trolley of pipe hydrostatic tester are built with FE simulation software ABAQUS in the study. With the FE models, the force statuses of the two heavy parts of pipe hydrostatic tester are studied. It is found that the stress of the action field of the axial force and that of small field contacting with the pins of the front beam is higher and thicker middle cylinder can significantly improve the stress of the front beam. The stress of the middle cylinder and that of small field contacting with the pins of the moving trolley is higher. Thicker middle cylinder and optimizational ribs can significantly improve the stress of the moving trolley. The front beam and the moving trolley are optimized and the strength and the stiffness of the optimized front beam and moving trolley can be satisfied with the requirement of application. The results of the study are very useful to design the pipe hydrostatic tester.
Development of Safety Detection Integrated Equipment for Car Seat
Authors: Wang Fu Yuan , Hong Lei , Yang Long Fei
Published: October 2011

The safety detection is one of the key procedures in production of car seats and it is also the quality guarantee of car seats. Safety detection items of QBC car seats include the supplemental inflatable restraint system resistance, passenger presence and safety belt power detection. The detection device adopts the passenger presence detection sensor, digital source meter, data acquisition card detect and collection information. The industrial control computer is applied to process information, judge the results. Finally the detection results are saved into the production database in the enterprise server by internet. The application shows that the detection device has high reliability, high automation level and secured data storage mode.
Pricing of Some Exotic Options under Jump Diffusion and Stochastic Interest Rates Model
Authors: Peng Bo
Published: October 2011

This paper assumes that jump process in underlying assets-stock price is more common than Poisson process and derive the pricing formulas of some exotic options under the stochastic interest rates by martingale method with the risk-neutral hypothesis.
Process Technology and Fixture Design for Critical Component of Radar
Authors: Jiang Li Zheng , Zhang Wei , Zhang Miao
Published: October 2011

The process technology of critical component (named arm part) was adopted through the analysis of structure features. The suitable fixture was designed correspond to their process. The critical points of the fixture were explained. Practice has proved that process technology and fixture design have improved quality and machining precision, and the time cost on machining was decreased by 40%, which has enhanced the competitiveness of enterprise.
A New PRI Transform for the Deinterleaving of Radar Pulses
Authors: Zhao Xiu Ying , Wang Hong Yu , Yang Cheng Zhi , Wu Hong Chao
Published: October 2011

This paper presents a new algorithm for the deinterleaving of radar signals, using the direction of arrival (DOA), carrier frequency (RF), and time of arrival (TOA). The algorithm is mainly applied to pulse repetition interval (PRI) signals. This algorithm consists of two steps: In the first step, a PRI transformation is used to the received pulses after pre-deinterleaved of frequency and DOA. In this step, radar signals having the same frequency and DOA are identified as the same class. In the second step, the number of existing emitters and their PRIs is determined by using TOA information. The algorithm for deinterleaving uses the information obtained from the previous analysis to reduce the PRI errors. The simulation results show that the algorithm is successful in high pulse density environments and for the complex signal types.
A New Fuzzy Support Vector Machine for Credit Scoring
Authors: Tang Bo , Xia Min
Published: October 2011

With China's rapid economic development, credit scoring has become very important. This paper presents a new fuzzy support vector machine algorithm used to solve the problems of credit scoring. The empirical results show that the proposed fuzzy membership model is valid ,the algorithm has good prediction accuracy and anti-noise ability.
Feature Analysis for Shadow Detection
Authors: Hu Xiao Peng , Huang Wan , Shi Guo Min
Published: October 2011

In minimally invasive surgery (MIS), depth estimation is also one of the most essential challenges. With the urgent demands of improving surgical safety, a method of improving the surgeon’s perception of depth by introducing an “invisible shadow” in the operative field has been proposed. A novel approach is presented for adaptive shadow detection by incorporating four different attributes and using a classification algorithm to make a distinction between shadow and non-shadow regions. Experimental results show that shadow region can be detected quite well and thus the method could potentially be used as an instrument navigation aid in minimally invasive surgery.
Adaptive Contract Net Protocol Based on Ant Colony Optimization Algorithm
Authors: Tang Xian Lun , Fan Zheng , Li Ya Nan , Cai Lin Qin
Published: October 2011

An adaptive contract net protocol which can adapt to dynamic environment is proposed based on ant colony optimization algorithm. In the negotiation process of task allocation, the probability of the contractor being selected is related with the contractor’s credibility and ability. Several experiments are performed to show the advantages of this algorithm, it has a better decision quality when task recurrence rate (TRR) unchanged, and the communication traffic (CT) remains at a low level as TRR increases when the number of tasks (NT) unchanged. As a result, the algorithm can enhance the decision quality and reduce the communication traffic.
Data Acquisition System Based on VC++
Authors: Wu Jing Bing , Wang Xie , Shu Lun
Published: October 2011

In this paper, we introduced features of data acquisition card based on PCI bus, and combined with researching on timing data collection system in the reducer test, built data acquisition system aiming at parameters of the reducer, and by using VC+ + to program, we achieved display on timing and real-time acquisition curve of data of torque and speed of the reducer, and have got good results.
Fluid Flowing of Cohesive Mixing in the Tank of a Planetary Mixer
Authors: Yang Ming Jin , Li Xi Wen , Shi Tie Lin
Published: October 2011

Fluid flowing of mixing is mathematically expressed as mapping. The Smale horseshoe map is a typical model for cohesive mixing, and has a tremendously positive influence on mixing. Based on Smale Horseshoe Mapping Model, a method of defining move parameters of the mixing system of a planetary mixer was presented in this paper. The fluid flowing of the mixing system obtained shows good performance of ergodicity and mixing.
Enhancement of Soil Thermo-Physical Properties Using Microencapsulated Phase Change Materials for Ground Source Heat Pump Applications
Authors: Dehdezi Pejman Keikhaei , Hall Matthew R. , Dawson Andrew R.
Published: October 2011

Soil can be modified with Phase Change materials (PCM) in order to enhance its thermo-physical properties and energy storage for ground source heat pump applications. This paper studies thermo-physical properties of soil modified with different amount of microencapsulated PCM. It is shown that increasing PCM amount in soil lead to lower thermal conductivity and increase of volumetric heat capacity of PCM-modified soil across the PCM melting temperature range. In addition, numerical simulation is performed to study the potential application of PCM-modified soil for reduction of temperature variations in ground. The result of numerical simulation revealed that temperature variation under PCM-modified soil can be reduced by up to 3°C compared to conventional soil. This could improve the Coefficient of performance of a heat pump system by more than 17%.
Study on Mixed-Mode Interlaminar Fracture of Laminated Composites
Authors: Fan Xue Ling , Sun Qin
Published: October 2011

The superposition-finite element method is developed to analyze the mixed-mode delamination in laminated composites. Both a coarse global mesh and an overlaying fine local mesh are integrated into the finite element analysis model. The whole design domain is discretized by a uniform global mesh, while the high stress regions are discretized by fine local meshes. Local mesh is built independently from the global mesh, which greatly simplifies the model generation procedures. Strain energy release rate is calculated based on the modified virtual crack closure-integral method, which is used to describe the propagation of delamination in laminated composites. Mixed-mode bending tests are performed for unidirectional and cross-ply carbon fiber reinforced laminated composites to characterize the interlaminar fracture behavior under mixed-mode I/II loading conditions. The interlaminar fracture toughness is also given for different mixed-mode ratio. It is seen that fracture resistance for laminated composites exhibit R-curve behavior (increase as delamination propagation). However, once the delamination is sufficiently long, the interfacial fracture toughness changes slightly as the delamination extended and become almost independent of the delamination length. The results of finite element method are in good agreement with the experimental results and provides a basis for establishing failure criterion used in damage tolerance analysis of composite structures.
Composite Materials Manufacturing Processes
Authors: Khosravani Mohammad Reza
Published: October 2011

— Using Composite materials are growing more and more today and we have to use them in possible situation. One of the Composite materials applications is on the Airplane and aero space. Reduction of Airplane weight and more adaptability with nature are examples of benefit of using composite materials in aerospace industries. In this article process of manufacturing of composite materials and specially carbon fiber composite are explained. Advance composite materials are common today and are characterized by the use of expensive, high-performance resin systems and high-strength, high-stiffness fiber reinforcement. The aerospace industry, including military and commercial aircraft of all types, is the major customer for advanced composites. Product range now includes materials for low pressure and low temperature. Some using composite materials in aero space are as follow: Satellite Components, Thin Walled Tubing for Aircraft and Satellites, launch vehicle components and honeycomb structures.
Dual Fuel Performance Studies of a Small Diesel Engine Using Green Fuels
Authors: Sahoo Bibhuti B. , Sahoo Niranjan , Saha Ujjwal K.
Published: October 2011

The objective of this work is to review state of art practices and potential in diesel engines using greener fuels. Biogas with jatropha bio-diesel as ignition source was tested in a compression ignition diesel engine at six different loads under dual fuel mode. With a simple modification, the base engine was qualified to a dual fuel operation. For all the loads evaluated, dual fuel mode achieved a possible bio-diesel substitution of about 65%. In addition, it consumed lesser friction power as compared to the diesel mode during the operation. There were reductions in thermal efficiency, cylinder peak pressure and combustion noise under the dual fuel operation than the diesel mode due to lower burning velocity of biogas together with a longer pilot delay. However, this operation registered extremely lower NOx levels at all loads along-with reduced CO emissions at medium and higher loads. While significant increases in hydrocarbon emissions were observed.
Exergetic Destruction Effects of Operating Conditions on the Turbojet Engine Components
Authors: Karakoc T. Hikmet , Turan Onder
Published: October 2011

The minimization of exergy destruction brings the design as closely as permissible to the theoretical limit. This study presents exergy destruction analysis of a turbojet engine for different flight Mach number and altitudes. Turbojet engine being considered consists of an inlet, a centrifugal compressor, reverse flow combustion chamber, axial-flow turbine and exhaust nozzle. The flight Mach number and altitude are examined on the exergetic destructions of compressor, combustion chamber, turbine and exhaust nozzle. The results of component-based destruction analysis are given as three dimensional exergetic-destruction response surface plots related to altitude and flight Mach number.
Modeling and Optimization of Heat Recovery Heat Exchanger
Authors: Kaviri Ganjeh , Mohd Jafar M.N. , Tholudin M.L.
Published: October 2011

The Combined Cycle Power Plants (CCPPs) are attractive in power generation field due to their higher thermal efficiency than individual steam or gas turbine cycles. Therefore thermo optimal design of Heat Recovery Steam Generator (HRSG) in CCPPs is an important subject due to the increasing the fuel prices and decreasing the fossil fuel resources. In this paper the heat recovery steam generator (HRSG) with typical geometry and number of pressure levels used at CCPPs in Iran is modeled. Then the optimal design of HRSG operating parameters was performed by defining an objective function and applying Generic algorithm optimization method. The total cost per unit of produced steam exergy was defined as the objective function. The objective function included capital or investment cost, operational cost, and the corresponding cost of the exergy destruction was minimized while satisfying a group of constraints.
Comprehensive Study of Typical Metamodel Methods Applied in Aircraft Multidisciplinary Design Optimization
Authors: Long Teng , Liu Li
Published: October 2011

—Metamodels have been widely applied in aircraft multidisciplinary design optimization (MDO) to alleviate the computation burden and improve the optimization efficiency. At present, there are various metamodel methods available, such as response surface method, Kriging model, moving least squares method, radial basis function, neural networks and so on. However, it is difficult to confirm which metamodel method is more promising, which is also an interesting question puzzled most designers. In this article, by using a series of numerical test problems with different inherent features, a comprehensive study is employed to compare five typical metamodel methods commonly applied in aircraft MDO under multiple metrics. In term of the comparison results, the conclusions are drawn and recommendations for selecting suitable metamodels in aircraft MDO practice are also summarized.
Nano-Particles in Concrete and Cement Mixtures
Authors: Nik Aref Sadeghi , Bahari Ali
Published: October 2011

The construction industry uses concrete to a large extent. currently, the most active research areas dealing with cement and concrete are: understanding of the nanostructural properties of cement and the use of nano–particles, here, Ti nanoparticles in these mixtures. We have synthesized nanoparticles with sol-gel method at 500°C in ambient media and studied their nanostructures with using SEM (scanning Electron Microscopy) technique. The obtained results show that nanosilica can make more stable structure of concrete and/ or cement mixtures.
Novel Method on Using Evolutionary Algorithms for PD Optimal Tuning
Authors: Khoshrooz R.A. , Vahid M.A.D. , Mirshams M. , Homaeinezhad M.R. , Ahadi A.H.
Published: October 2011

This paper presents a method to solve the Evolutionary Algorithm (EA) problems for optimal tuning of the Proportional-Deferential (PD) controller parameters. The major efficiency of the proposed method is the Genetic Algorithm (GA) stuck avoidance as well an appropriate estimation for GA lower and upper bounds. Also by this method for the Particle Swarm Optimization (PSO) methodology the initial choice of the controller parameters can be fulfilled to achieve the acceptable performance accuracies. For both GA and PSO methods, the Linear Quadratic Regulator (LQR) obtained trend is used as the reference for the determination of the aforementioned bounds and initial guess. The presented algorithm was applied to regulate a PD controller for the attitude control of a virtual satellite and also with Hardware-in-the-loop (HIL) reaction wheels. Heavy burden trying and error was eliminated from the PD controller design which can be mentioned as the important merit of the presented study.
Horizontal Distribution of Illuminance with Reference to Window Wall Ratio (WWR) in Office Buildings in Hot and Dry Climate, Case of Iran, Tehran
Authors: Mahdavinejad Mohammad Javad , Matoor Soha , Feyzmand Neda , Doroodgar Amene
Published: October 2011

The Issue of daylight inclusion in the office buildings has got the significant importance in the recent years. Using this light, dependence on artificial lighting sources can be reduced which results in the energy efficiency. This study aims to determine the optimal Window Wall Ratios in the office buildings of Tehran to take the advantage of daylight abundance regarding the climatic features without making the designers involved with the complicated calculations. All the research analyses have been done based on the window models comparison through the computational simulations. After the primary analyses, the models were developed and put to the test again. The study shows that among from all the tested models, an optimal WWR range for the office buildings of Tehran can be proposed.
Effect of Hydrostatic Pressure and Depth of Fluid on the Vibrating Rectangular Plates Partially in Contact with a Fluid
Authors: Khorshidi Korosh
Published: October 2011

This study is focused on vibration analysis of a rectangular plate in partial coupled with a vertical bounded fluid. The fluid displacement potential satisfying the fluid boundary conditions is derived and the wet dynamic modal functions of the plate are expanded in terms of the finite Fourier series for a compatibility requirement along the contacting surface between the plate and the fluid. The natural frequencies of the plate coupled with sloshing fluid modes are calculated using Rayleigh–Ritz method based on minimizing the Rayleigh quotient. The proposed analytical method is verified by comparing the presented results with the results obtained by three–dimensional finite element analysis. Finally, the influence of hydrostatic pressure and fluid depth on the natural frequencies are examined and discussed in details.
Hot Compressive Flow Behavior of Inconel 600 Superalloy
Authors: Wu Horng Yu , Sun Pin Hou , Zhu Feng Jun , Liao Jing Hao , Wang Shang Chih , Wang Woei Ren , Wang Chien Cheng , Chiu Chui Hung
Published: October 2011

The flow behavior and associated structural changes of an Inconel 600 superalloy were analyzed by using hot compression tests in the temperature and strain rate ranges of 850–1200 °C and 0.001 to 10 s–1, respectively. The stress–strain curves exhibited the trend typical of materials in which deformation is recovery-controlled at high strain rates and low temperatures, while at low strain rates and high temperatures, the flow curves exhibited a softening typical of recrystallization phenomena. Constitutive analysis was carried out to investigate the hot deformation mechanism using the hyperbolic sine law.
Research on Corrosion Behavior of Al-Zn-In Based Anode Alloys by Circular Polarization Method
Authors: Ma Jing Ling , Wen Jiu Ba , Shao Hai Yang
Published: October 2011

In order to improve the electrochemical properties of Al-Zn-In alloys, Al-5Zn-0.02In-1Mg-0.05Ti-xMn (x=0, 0.3, 0.5, 0.7, 1.2) (wt %) alloys were develpoed. Electrochemical properties and corrosion behaviour of the alloys were investigated. The results show that the electrochemical properties are obtained in Al-5Zn-0.02In-1Mg-0.05Ti-0.5Mn alloy. The excellent electrochemical properties of the alloy is mainly attributed to uniform corrosion. Corrosion behaviourof the alloys were analysed by corrosion characteristic parameters such as Ec, Epit, Eprot and Eptp. This analysis result has a good agreement with the alloy corrosion morphology.
The Dynamics for Aqueous Sodium Adsorption and Characterization of Natural Pyrophyllite
Authors: Liu Bo , Chen Hai Feng , Tang Pei Song
Published: October 2011

In this experiment, pyrophyllite as the main materials used the flame photometer to measure adsorption. Using the qualitative analysis of the samples of XRD with internal structure and found that pyrophyllite used in the experiment as a natural mineral, the presence with other minerals. Meanwhile, scanning electron micrographs (SEM) from the display showed that the effect of pyrophyllite adsorption for cations should be more significant. Therefore, this experiment focused on the time, Na+ concentration, on the pyrophyllite and different pyrophyllite concentrations (adsorbent dosage) effect on the adsorption, in addition to the adsorption dynamics. The results showed that pyrophyllite adsorption sodium in the best time of equilibrium was 20 minutes, the concentration of NaCl was 50 mg/L, pH = 7, temperature was 313 K, the concentration of pyrophyllite was 5 mg/L.
The Microstructure of Ni-Based Surface Infiltrated Layer on Cast Steel Substrate
Authors: Yang Gui Rong , Song Wen Ming , Ma Ying , Hao Yuan
Published: October 2011

The Ni-based alloying powder was successfully used as the raw materials for fabricating surface infiltrated layers on cast steel ZG45 substrate through a vacuum infiltration casting technique (VICT). The microstructures of surface Ni-based infiltrated layer, the micro-hardness distribution are investigated. The infiltrated layer includes three areas that are surface part-melting area, melting completely fusion area and diffusion solid solution area. The main composition of surface infiltrated layer was intermetallic compound Cr2B，NiB and solid solution. The main phase of transition layer was solid solution. The micro-hardness of Ni-based infiltrated layer presented gradient change from surface infiltrated layer to substrate. The average micro-hardness was about 550HV.
Evaluation on some Properties of SL7560 Type Photosensitive Resin and its Fabricated Parts
Authors: Huang Bi Wu , Chen Ming Yi
Published: October 2011

Stereolithography technique is dealt with the techniques of machinery, laser, numeral control, computer software and photosensitive resins, etc. The quality of the photosensitive resins has direct effect on the dimensional accuracy, mechanical properties of the fabricated parts. Therefore the further research on SL7560 type photosensitive resins is very meaningful and valuable. The properties of SL7560 type photosensitive resin were investigated by some instruments and equipments. Characteristics of FT-IR showed that SL7560 type photosensitive resin belonged to an epoxy-acrylic hybrid photosensitive resin. The experimental results showed that its viscosity at 30°C was 197mPa.s, its critical exposure (Ec) was 5.9mJ/cm2, its penetration depth (Dp) was 0.14mm, the tensile strength of its cured product was 43.7MPa, the tensile modulus was 2549MPa, the elongation at break was 10.7%. With the photosensitive resin as the processing material, the part of a mobile phone shell was fabricated using the Stereolithography Apparatus (HRPL-I), and the quality of the fabricated part was good.
Investigation of Vibration Properties of Multi-Walled Carbon Nanotubes
Authors: Tian Mei Ling , Wang Jin Bao , He Xiao Qiao
Published: October 2011

Based on an explicit van der Waals (vdW) model, which can reproduce the interaction between any two layers of multi-walled carbon nanotube (MWCNT) and is dependent on the change of interlayer spacing and on the tube radii, the vibration analysis of multi-walled carbon nanotubes is carried out by using of the multi-layered Flugge shells model. The natural frequencies are analyzed in detail for with various radii and number of tubes. Furthermore, the natural frequencies of double-walled carbon nanotube with the innermost radii of 0.6 nm predicted based on the Flugge shell model are well compared with those from the Donnell shell one. The present investigation will be meaningful for the design and application of multi-walled carbon nanotubes as nano- resonators.
Growth Mechanism of Hollow ZnO Microsphere with Aperture Prepared by Oxidation of Zn Powder
Authors: Li Yuan Xing , Fan Dong Hua , Peng Hui Ren , Li Bo Jie
Published: October 2011

ZnO microsphere with aperture were synthesized using pure Zn powder as templates via thermal evaporation methods. X-ray diffraction pattern shows the change of crystal structures from Zn to ZnO. SEM and TEM images show that the samples prepared at low gas pressure have hollow ZnO microsphere with aperture. Compared with the morphologies of samples synthesized at high gas pressure, the growth mechanism of hollow ZnO microsphere with aperture is presumed in detail. The experimental results indicate that the evaporation of Zn inside the ZnO microsphere shell prompts the formation of hollow microsphere, and that the high pressure induces the breakage of weak locations to form the apertures, which eventually results in the appearance of ZnO microsphere with small pores and big apertures.
Effects of Annealing Temperature on Properties of CuIn (Se,S)2 Film Prepared by Sputtering
Authors: Lin Yi Cheng , Chen Z. J. , Wang L. C.
Published: October 2011

This paper examines CuIn(Se,S)2 (CISS) films prepared by sputtering precursor films of In, Cu, and In2S3 onto Mo coated soda-lime glass, followed by a single-stage selenium annealing process to form a CISS chalcopyrite phase. In this study, S was substituted for Ga to increase the energy gap of CuInSe-based materials. Experimental results reveal that the composition of (S + Se) and S decreased slightly with an increase in the selenium annealing temperature, exhibiting uniform distribution throughout the entire CISS film sample. The resulting CISS film exhibited p-type conductivity with an energy gap of 1.11eV. The optimum selenium annealing condition for the CIGS precursor prepared by sputtering was 798 K for 20 minutes.
Effects of Solid-Solution Treatment on Microstructure and Mechanical Properties of HIP Treated Alloy 718
Authors: Chang Shih Hsien , Lee Shih Chin , Huang Kuo Tsung , Liang Cheng
Published: October 2011

The aim of this study is to explore alloy 718 that treated at an optimal HIP process, and then imposed various solid-solution temperatures and aging treatment. The experimental results indicated that Laves and δ precipitations obviously appeared within the grain boundary, under HIP treatment and lower solid-solution temperatures (940°C), which would result in poor mechanical properties. However, Laves and δ phase can be completely dissolved at 1020°C 1 hour solid-solution treatment. The tensile strength was increased to 1331.5 MPa, and elongation reached up to 6.1% under a 1020°C solid-solution and aging treatment. Increasing the solid-solution temperature to 1060°C would cause parts of the NbC to dissolve, thus a large number of the thin sheet-shaped NbC would appear in the solid-solution and aging specimen. The yield stress is slight increase, but a lot of NbC precipitations will result in the decreasing tensile strength (1298.8 MPa) and elongation (5.4%). As a result, the optimal solid-solution treatment parameter of alloy 718 is 1020°C for 1-hour.
Facile Synthesis of N-{2-[4-(2-Pyrimidinyl)-1-Piperazinyl]ethyl} Adamantane-1-Carboxamide
Authors: Su Qiang , Guo Jian Wei , Yang Chu Fen , Cui Ying De
Published: October 2011

A facile method for the synthesis of N-{2-[4-(2-pyrimidinyl)-1-piperazinyl]ethyl} adamantane-1-carboxamide(Adatanserin) was developed by using 2-chloropyrimidine and adamantanecarbonyl chloride as the starting material via amidation and N-alkylation, using convergent route to reduce workups and steps in a good yield. The structures of compounds were confirmed by IR spectral, 1HNMR and elemental analyses.
Cellulose Tris(3,5-Dimethylphenylcarbamate) Regioselectively Bonded to Small Pore Silica Gel as Chiral Stationary Phase for HPLC
Authors: Zhang Yi Jun , Dong Cai Xia , Chen Jun , Liu Run Qiang
Published: October 2011

A bifunctional reagent of terephthaloyl chloride was initially adopted as a spacer reagent to prepare the bonded types of chiral stationary phase (CSP) with cellulose derivatives. (3,5-dimethylphenyl)carbamates of cellulose (CDMPC) regioselectively bonded to small pore (3-aminopropyl)silica gel (APS) were prepared with terephthaloyl chloride as a spacer at the 6-position of the primary hydroxyl group on the glucose unit of cellulose. Enantioseparations of five racemic samples are evaluated on the prepared CSP under normal-phase high-performance liquid chromatographic mode with hexane- isopropylalcohol as the mobile phase. The influence of flow rates and mobile phase compositions on the resolution were investigated. The prepared stationary phase was exhibited an effective chiral recognition.
The Existence of Positive Periodic Solution for a Class of Functional Differential Equation with Multi-Delays
Authors: Fan Ge Hua , Dong Yu Cai , Yi Liang Hai , Xia Jing
Published: October 2011

We discuss the existence of periodic positive solution of one kind of multiple time-delay functional differential equations with the cone theory and fixed index method in semi-order Banach space of nonlinear functional analysis.
The Thickness Testing Technology of the Metal Base and Anticorrosion for Double Coating Corrugated Sheet Steel Beams for Guardrail
Authors: Lu Yu Hong , Gong Bai Yan , Xu Dong
Published: October 2011

The thickness of metal base and anticorrosion is key indicators in evaluating the quality of corrugated sheet steel beams for guardrail, especially for double anticorrosion. The testing method in this paper is simple and convenient, accurate and reliable, which has been confirmed in engineering practice.
Effect of K / Na on Primary Boride of Hypereutectic High-Boron Alloy
Authors: Xu Liu Jie , Li Bao Yuan , Li Ji Wen , Zhang Guo Shang , Wei Shi Zhong
Published: October 2011

High-alloy materials such as high chromium cast iron and high speed steel have excellent wear resistance under extreme wear conditions. But they consume much expensive chromium, molybdenum, tungsten and other alloying elements too. The hypereutectic high boron alloy has good wear resistance because it contains many high hardness primary borides. But the dimension of primary borides is big. In this paper, the hypereutectic high boron alloy was prepared using sand casting method, and the primary borides were modified by different amount of K / Na modificator. The results show that the primary boride of hypereutectic high boron alloy is Fe2B. K/Na modificator has a significant influence on primary Fe2B. The best grain refinement effect of primary Fe2B is obtained when the amount of K/Na modificator is 0.3%. The refining mechanism of primary Fe2B is that K/Na modificators can not only increase the supercooling degree to improve nucleation rate but attach to the crystal face of fastest growth direction to prevent grain from growing
Study of Selecting Proper Chitosan from Various Chitosan Sample as Paper Strengthening Agent
Authors: Ma Yong Sheng , Sun Xian Hui
Published: October 2011

It is usually reported that chitosan is used as paper strengthening agent. However, it is sorry that the study choosing chitosan which DD (degree of de-acetyl )and viscosity is filtered by experiments is blank. Many chitosan samples of wide viscosity range and wide DD range were tested by their strengthening effect on bleched wheat straw pulp. Then a few sample of chitosan is selected because of their obvious strengthening effect on pulp. This study could be as the foundation of further research of chitosan used as paper strengthening agent.
Gravity Anomaly Computed by GOCE Data in Northeastern Margin of Tibetan Plateau
Authors: Xu Hai Jun , Zhang Yong Zhi , Duan Hu Rong
Published: October 2011

In this paper, gravity anomaly in northeastern margin of Tibetan Plateau (90ºand 110º E, 28ºand 42º N) is computed using satellite gravity gradiometry data from GOCE satellite. The computed gravity anomaly is compared with the topographical data and location of some strong earthquakes in this region. The result shows that gravity anomaly has good conformity with the regional tectonic distribution and strong earthquake usually occurred in the steep gravity gradient zone.
Study on the Influence Factors of Real Estate Price Based on Regression Model — The Case of Jilin City
Authors: Tan Xi Li , Zhou Han , Xu Ying Song
Published: October 2011

Real estate price has been one of the hottest discussion topics, especially in recent years, it becomes the focus of attention. In this paper, we aim to study the impact of economic factors on real estate price. By multiple linear regression model and SPSS software, we analyze four economic indicators affecting the real estate price of Jilin city, and make some amendments and testings, the conclusions show the consumption level and housing construction area are important factors affecting the price trend. On this basis, we further to give the corresponding countermeasures and suggestions.
Design of Parking Control Systems Based on Wireless Sensor Network
Authors: Ni Yong , Chen Chen , Xu Zhen , Wang Fang
Published: October 2011

With the rapid development of the national economy, increasing national income, increasing total vehicle population, the growing problem of urban parking difficult, advanced control technology in the parking management system in use is more practical significant. Parking by the systematic investigation and research at home or abroad, as well as similar analysis of system design technology, this paper of wireless sensor network technology based on the parking control system related to technical analysis, then designing the hardware circuit and the corresponding software, finally, the new wireless parking control system has been designed and realized.
Research on Fire Performance of a Profiled Light Aggregate Concrete Composite Floor
Authors: Ji Yao , Wang Xin Tang , Zhou Ming , Sun Hong Liang
Published: October 2011

To study the fire performance of the profiled sheet-light aggregate concrete composite floor subjected to fire load, study of fire response and post-fire bearing capacity of a profiled sheet-lightweight aggregate concrete composite floor subjected to dead load is carried out. Based on the experimental results, the fire performance and post-fire bearing capacity of the floor after exposure to fire are analyzed. It is shown that the failure form of the profiled sheet-ceramsite concrete composite floor after exposure to fire still exhibits higher bearing capacity, and the ultimate value of the equivalent distributed load is up to 35kN/m2, which may be used as basis of strengthening and repairing of the profiled sheet-lightweight aggregate concrete composite floor after exposure to fire.
Effect of Underlay Rigidity on Breaking Behavior of Aluminum Sheet during Wedged Shearing Process
Authors: Chaijit Seksan , Nagasawa Shigeru
Published: October 2011

This study aims to clarify the breaking behavior during wedge shearing process of an aluminum worksheet that stacked on to an underlay sheet. One of the problems faced in wedge cutting process is the separation possibility and the quality sheared profile of worksheet, the lower underlay sheet was introduced. To study the breaking behavior of an aluminum sheet with flexible underlays, a 42°center bevel blade indentation test to a 0.39mm thickness aluminum stacked on to several flexible underlays conditions were carried out experimentally and numerically. For discussing the effect of the rigidity of underlay on the breaking behavior of worksheet, an elasto-plastic finite element analysis was applied to. The following were obtained: (i) the initial breaking of worksheet and the sheared profile depends on the underlay rigidity; (ii) the breaking propagation is started from the lower surface of worksheet and grows up to the upper side beneath the tip edge.
The Study on Harmonic Characteristics of Three-Phase SPWM Inverter
Authors: Zhang Hong Juan , Hou Yong Xing
Published: October 2011

Through using dual Fourier transform quantitative analysis and harmonic loss calculation on the output voltage of three phase voltage-Sinusoidal Pulse Width Modulation (SPWM) inverter, a valid harmonic inhibition scheme is presented. Carrier frequency is reasonably selected to eliminate low times harmonics, harmonics of carrier frequency times and triple frequency sideband. Analysis of fast Fourier transform is achieved in MATLAB. Simulation results show that harmonics are effectively inhibited, output voltage waveform is improved and voltage distortion factor is decreased from1.16% to 0.71%.
Energy Consumption Analysis of Cooling System in Jiahe Deep Coal Mine
Authors: Zhang Yi , Guo Dong Ming , Tian Jing
Published: October 2011

Heat damage caused by deep mining is the inevitable trend in coal mine development. HEMS cooling system is a process system for high-temperature heat damage controlling in deep coal mine, in which cool energy in mine water extracted to reduce work face’s ambient temperature, to achieve heat damage controlling. We analyze the energy consumption of every subsystem during operation of the HEMS system, which could provide a theoretical basis and technical guidance on more efficiently running of cooling system deep in the future.
An Airflow Field Finite Element Analysis of the Seed Adsorption Hole of Pneumatic Seeder
Authors: Zhao Man Quan , Liu Yue Qin , Hu Yong Wen
Published: October 2011

The seed adsorption disk is an important component of the seed metering device. The differences in size and shape of suction hole on the adsorption disk result in variation of the airflow field formed. A finite element analysis of airflow field for the suction holes of different size and shape was conducted in this paper. The two dimensional simulation of airflow field for different shaped suction hole under the condition of identical bore diameter and air pressure difference reveals that the average airflow velocity inside the different shape of suction holes are the highest one in cylindrical hole and the lowest in tapered hole, the airflow speed at inlet opening of three different suction hole does not vary evidently. Both the result of airflow field two dimensional finite element analysis of different bore diameter suction hole and its proof under the condition of the shape of suction holes and air pressure difference being identical reveal that with the bore diameter being enlarged, the airflow speed inside the suction hole increases in comparison of the airflow speed field for three different suction holes of different bore diameter. To enlarge the bore diameter of suction hole and expand the adsorption surface area of the seed will result in the airflow rate and airflow speed getting higher and the adsorption function on the seed growing stronger.
The Influences of Interface Properties Weakening on Bearing Behavior of Pile Foundation
Authors: Yang Hai Peng , Bai Bing , Nie Qing Ke
Published: October 2011

In the longer period under the effect of changing load, pile-soil interface properties will be soften. Therefore it will reduce the foundation capacity and increase the Foundation the settlement, and bring the project safety risk. The influences of interface properties weakening on bearing behavior of pile foundation were analyzed by mathematic calculation method. These results would be used for the research of foundation bearing behavior under variable load.
A New Method to Accurately Describe Cross-Section Distortion in Rotary Draw Bending Process of Thin-Walled Rectangular Tube
Authors: Zhao Gang Yao , Zhang Rang Yang , Liu Yu Li , Guo Zheng Hua , Fang Ping
Published: October 2011

To obtain the cross-sectional distortion of thin-walled rectangular tube in rotary draw bending process accurately, a new method to exactly describe the distortion has been proposed. The coupling between the convex of the tube side walls and the concave of the tube flanges is considered in the distortion modeling. Combined with the experiments, the cross-sectional distortion obtained using the new distortion model are compared with the previous ones obtained without considering the convex based on numerical simulations. The results show that cross-sectional distortion obtained by current model is closer to reality than the previous ones. The distortion by current model is more safety in the practical bending process.
Study of Post-Fire Behavior of a Profiled Sheet-Ceramsite Concrete Composite Floor
Authors: Wang Xin Tang , Zhou Ming , Sun Ping Xin
Published: October 2011

To study the post-fire behavior of the profiled sheet-ceramsite concrete composite floor after exposure to fire load, experimental research on post-fire bearing capacity of a profiled sheet-ceramsite concrete composite floor subjected to dead load, which has shearing nails, is carried out here. Based on the experimental results, the post-fire bearing capacity of the composite floor after exposure to fire is analyzed. It is shown that the failure form of the profiled sheet-ceramsite concrete composite floor after exposure to fire has obvious change compared with the floor not subjected to fire load, but the composite floor subjected to fire load exhibits higher bending capacity, and the ultimate value of the equivalent distributed load is up to 30.86 kN/m2, which may be used as basis of strengthening and repairing of the profiled sheet-ceramsite concrete composite floor after exposure to fire.
Research on Technological Parameters of Laser Cladding
Authors: Gao Zhong Tang , Zhang Min Hua
Published: October 2011

Send laser cladding experiments to the substrate surface in 16Mn in the Synchronous way. By different laser cladding parameters on the microstructure and mechanical properties under the comparative analysis, to make a more detailed discussion of laser cladding power and scanning speed on the quality of laser cladding. Different process parameters on the microstructure of cladding layer and the cladding layer of particle distribution and the tissue distribution of species .We get to the study that type and distribution of the cladding layer microstructure and tissue distribution of tungsten carbide hard phase. We get regular pattern that technological parameter has an effect on the quality of cladding layer. We can came to the conclusion that the best cladding process parameters is in the power of 3.0KW and cladding speed 1000mm/min.