bluuebunny/crossref_metadata_2025 huggingface dataset:
Confined Buckling Analysis of a Viscoelastic Ring Subjected to Constant Temperature Difference
Authors: Yang Min , Xiao Shi Fu
Published: July 2011

Based on Boltzmann’s viscoelastic theory, the confined buckling behavior of a viscoelastic ring subjected to constant temperature difference is investigated by assumed modes method, Galerkin method and numeric method. The critical load and the stability of the solution are investigated. The evolutionary trend of the system is also analyzed.
Study on Fire Resistance Design Parameters of RC Structure
Authors: Wang Xiao Dong , Zhang Xie Dong , Wang Jin Zhi
Published: July 2011

By analyzing the randomicity and sensitivity of design parameters on fire resistance performance of RC structure, it indicates that the concrete thickness of covering layer is the most sensitive parameter to RC fire resistance performance in all given out parameters. And the stochastic finite element reliability analyzing method is briefly introduced too.
The Application of Low-Frequency and Low-Power Ultrasound Algae Removal Technology in Pengxi River in Three Gorges Area
Authors: Zhang Zhi , Han Jing Ming , Cai Ming Kai , Fan Gong Duan , Luo Jing , Wan Xin , Liu Chao
Published: July 2011

Three ultrasonic transmitters of single power of 50W, frequency of 20~50 kHz,60~100 kHz and 100~150 kHz were used to remove bloom algae of Pengxi River in Three Gorges Area. The results show that algae are removed in some certain degree by 5 min’s irradiation of low-frequency and low-power ultrasound, the process follows the first order reaction, and the rate constant is 0.0384 min-1. In this study, the optimal ultrasonic time is 5 min, the removal of algae density and Chlorophyll-a are about 15% and 7%, the optimal frequency are 20~50 kHz and 100~150 kHz respectively.
Research on Diamond Polishing Process Based on Rough Set
Authors: Ma Yong Tao , Ma Ye
Published: July 2011

Polishing diamond with hot metal method was hard to get experimental data, which was very important to the process of polishing. The relationship between polishing parameters and polishing quantity cannot be easily deduced with the limited experimental data. This paper uses Rough Set method to process the data and some useful conclusions have been drawn. The load factor in polishing process can be ignored in the polishing process. In the case of engineering application, the load merely ensures the contact between diamond and hot iron metal. Other parameters, such as temperature, polishing speed and time, are important factors to the polishing quality.
Experimental Research on Impact Force and Erosion Effect of Different Hydraulic Pressure
Authors: Gao Chuan Chang , Zhao Li , Ma De Fang , Liu Xin Yang
Published: July 2011

Experiments were conducted for the impact force and erosion volume of the continuous jet, the self-excited aspirated pulse jet, the self-excited oscillation pulse jet on different hydraulic pressure in this paper. The rules of the three kinds of jet impact force and erosion effect with the change of hydraulic pressure were analyzed. The result shows the center impact force of the continuous jet is bigger than the other impact force. The self-excited aspirated pulse jet is obviously superior to the continuous jet and its erosion volume is 1.15~1.3 times as big as the continuous jet.
Study on the Brazing Technology and Mechanical Properties Using bmp7 Filler Metal
Authors: Hua Xiao Zhen , Guo Wen Ting , Xu Yong Tao , Ye Zhi Guo , Zou Ai Hua , Zhou Xian Liang
Published: July 2011

The 1Cr18Ni9Ti stainless steel was brazed in the argon shield and впр7 as the filler metal. The spreadability and clearance fillability of впр7 on 1Cr18Ni9Ti stainless steel was evaluated at different temperatures and the optimum brazing temperature was clearly demonstrated as 1170~1190°C. Scanning electron microscope (SEM) study combined with energy dispersive spectrometer (EDS) showed the presence of many undissolved elements and voids in the joints while the brazing clearance is 0.15mm, which directly caused a low joint shearing strength. Almost no undissolved brittle compounds were observed while the brazing clearance stands in a range of 0.01mm~0.10mm. Therefore, a Ni-based solid solution with good performance was obtained in the joint. Those brazing parameters matching with the holding time 8~10min could bring the joint a typical performance which fully satisfies Russian standard. These conclusions had been proved by joint stress-rupture and low cycle fatigue tests.
Fatigue Behavior of the Low-Strength Steel Welded Joints Treated by TIG Dressing and Ultrasonic Peening Combined Method
Authors: Li Sen , Wang Dong Po , Zhang Hai , Tan Bo
Published: July 2011

Butt-joint specimens of Q235B low-strength steel were treated by TIG dressing and ultrasonic peening combined method. The paper presents comparative fatigue test for welded specimens in the as-welded condition and specimens treated by TIG dressing, ultrasonic peening treatment (UPT) and the combined method. When the ratio of stress R=0.1, contrasted with the specimens in as welded condition, the fatigue strength of the specimens treated by TIG dressing is increased by 36%. The fatigue strength of the specimens treated by the combined method and UPT are almost the same, which are increased by 57% and 56% respectively. In the high stress level, weld toe treated by the combined method has smaller stress concentration factor than that of UPT, resulting in less release of residual compressive stress. So it's more effective to improve the fatigue life by the combined method. While in the low stress level, the residual compressive stress of weld toe treated by the combined method and UPT are nearly the same. Besides, the effect of stress concentration factor is smaller, thus the fatigue life of the two methods have little difference.
Welding Thermo Cycle and HAZ Softening of CT80 Butt Weld Joint
Authors: Li Xiao , Shi Kai , Peng Tao , Liu Yan Ming , Wang Hong Duo
Published: July 2011

The domestic manufactured CT80, Φ33×3.18 coiled tubing is supplied as heat-treated low-alloy steel. The relationship between thermo cycle, microstructure, tensile properties and hardness were researched for butt welded joint. The results show that CT80 is very sensitive to welding heat input, and the thermo accumulation was obvious for small dimension coiled tubing, varying degrees of softening always exist in HAZ. The reasons include growing of block ferrite, decreasing and isolating of continuous directional bainite. In order to get good properties, the strength of consumable welding wire should be properly matched with base metal, keep uniform strength distribution along welded joint, and avoid the plastic strain concentrate in local area.
Numerical Simulation of Welding Residual Stress Considering Phase Transformation Effects
Authors: Zhang Hai , Wang Dong Po , Li Sen
Published: July 2011

The welding processes of steel materials are often accompanied by the occurrence of phase transformation. Volume change caused by phase transformation will affect the history of stress and strain. In this article, taking the welding of Q345 as an example, the effects of solid-state phase transformation on the residual stress were investigated by numerical simulation. The values of thermal strain at different temperatures were set to make the volume change caused by phase transformation equivalent as thermal strain. The simulation contained two cases both considering phase transformation and not. The results show that in both two cases the longitudinal stress distribution in the weld zone has almost the same trend. But in the case without considering phase transformation, there is large longitudinal tensile stress concentrating in the weld and HAZ zone and the maximum value is up to 427MPa in the weld. For transverse stress, phase transformation not only changes the value of the stress, but also alters the sign of the stress in the middle of the weld zone. Experiment was also carried out to measure the residual stress by X-ray diffraction. The result considering phase transformation matched much better with the experimental data. It can be concluded that phase transformation in the process of welding has a significant effect on the residual stress and can not be ignored in the numerical simulation of welding.
Study on Microstructure and Performance of Bonding-FSSW Hybrid Joints of AZ31 Magnesium Alloy
Authors: Ding Cheng Gang , Ni Ya Qi , Guo Chuan Jun , Quan Gao Feng
Published: July 2011

In this paper a bonding-FSSW hybrid method is proposed and the performance and microstructure of bonding-FSSW joints of AZ31 aluminum alloy is examined . The results show that the bonding agent has little influence on the forming and mechanical property of FSSW nugget, the shear-resisting property of joints resulted from bonding with sealing glue and FSSW is equivalent to FSSW joints, in bonding-FSSW with high-strength bonding agent, the shear-resisting property of joints are apparently superior to that of pure FSSW or bonding joints. Tiny and uniform equiaxial grains are formed in the WN(Welding nugget zone) and coarse grains are formed in TMAZ (Thermomechanically affected zone) and HAZ (Heat affected zone), but with unequal size.
Leveraging Heterogeneity Make Resource Location Efficient in Peer-to-Peer Networks
Authors: Gong Ya Dong , Wen Yong Xiang , Deng He Ping , Gu Zhan Ran
Published: July 2011

Although the original intent of the peer-to-peer (P2P) concept is to treat each participant equally, the heterogeneity is an inherent characteristic of P2P systems. In this paper, according to the previous researches in P2P resource sharing networks, we first conclude and classify the heterogeneity in P2P networks, and then analyze each type of P2P systems that utilize heterogeneity in P2P network. The above analysis and conclusion will become a good guidance to design new resource locating algorithm which takes advantage of heterogeneity in P2P networks.
Microstructure and Damping Property of the Composite Discontinuous NiTi SMA Thin Films Deposited on PZT Substrate
Authors: Liu Qing Suo , Dong Zhan Ji , Kong De Qun
Published: July 2011

Discontinuous NiTi SMA thin films were deposited on PZT substrate by magnetron sputtering method with a specially designed pore plate. The microstructure and damping property of the prepared composite were studied with X-Ray diffraction, scanning electric microscopy and dynamic elastic modulus apparatus. It was found that the NiTi SMA thin films with physical dimension of the width of less-than or equal to 2mmand distance between the adjacent thin films of 1mm are of best equiaxed crystal structure after crystallization at 600°C. The damping effect of the composite is still caused by PZT and the damping value is generally lower than that of pure PZT, about 9.9%.
Structural and Optical Properties of Zn1-XCoXO Thin Films Fabricated by Laser Molecular Beam Epitaxy
Authors: Yang Jing Zhi , Fu Li Juan , Qi Xiao Peng , Li Hong Yun
Published: July 2011

Zn1-xCoxO thin films on sapphire (0001) substrates were synthesized by laser molecular beam epitaxy (LMBE) method at various temperatures under a work ambient pressure of 5.0 x 10-5Pa condition. X-ray diffraction (XRD) spectra, UV–visible transmission spectra and X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectra were employed to characterize the properties of samples. All samples were of wurtzite hexagonal structure with the preferential c-axis-orientation. Co2+ions incorporated into ZnO lattice and substituted for Zn2+ions. ZnLMM Auger spectrum implied Zn interstitials existed in sample. The optical transmission of all samples was relatively high in visible region. Two PL emission peaks located at 418 nm and 490 nm were assigned to the electron transition from the Zn interstitials to the top of the valence band and from the Zn interstitials to the Zn vacancies, respectively.
Recent Developments in Microextraction Related Techniques for Trace Environmental Analysis
Authors: Zhao Liu , Ma Zhi Hong , Wang Dong , Pan Li Gang , Wang Ji Hua
Published: July 2011

Sample preparation is always a bottleneck in system for chemical analysis. In recent years, the development of methodologies for microextraction related techniques has progressed phenomenally. This review introduces and compares the various microextraction approaches for trace environmental analysis, and the advantages and disadvantages of current methods are proposed as well.
Growth and Field Emission Properties of the Carbon Complex Films
Authors: Gao Jin Hai , Li Zhen , Zhang Wu Qing
Published: July 2011

The carbon complex film, Which consists of diamond grains, carbon nanotubes, amorphous carbon composition, were fabricated by microwave plasma chemical vapor deposition （MPCVD） method. The ceramic with a Ti mental layer was used as substrate. The carbon complex films were evaluated by Raman scattering spectroscopy, x-ray diffraction spectrum, scanning electron microscope. The field emission properties were tested by using a diode structure in a vacuum. A phosphor-coated indium tin oxide anode was used for observing and characterizing the field emission. The turn-on field was only 0.55V/μm and emission current density as high as 11mA/cm2 was obtained under an applied field of 2.18V/μm for the first operation. The growth mechanism and field emission properties of the carbon complex films are discussed relating to microstructure and electrical conductivity.
Study on Properties of Bast Fibers
Authors: Bai Li Hong , Yu Hong Qin
Published: July 2011

Light weight , softness and comfort are becoming the development priority for the bast fabrics for apparel use. Therefore, some properties of the bast fabers related to these aspects become important. In this paper, the properties of bast fibers, including fiber length, fineness, tenacity, softness were tested and evaluated to determine which is better for developing fabrics pleased by the consumers by using optimal design theory. The results show that ramie fiber has high softness, great tenacity and is finest. It is the best material for the garments required light weight and comfort, hemp second, the next is flax and kenaf. Jute is the worst one.
The Dispersion of CNT and the Conductive Property of PA6/MWNTs Nanofiber Filaments by Electrospinning
Authors: Liu Yang , Li Jie , Pan Zhi Juan
Published: July 2011

Consecutive PA6/MWNTs nanofiber filaments were successfully fabricated by an improved electrospining method in this paper. The microstructure and the arrangement of MWNTs in the nanofibers both with the conductivities of the filaments in different MWNTs contents were studied. The results show that the orientation arrangement of the nanofiber and MWNTs in the fibers were both fine at different MWNTs contents .Besides, with the increase of the MWNTs contents, the diameters of the nanofiber increased, while the conductivity of the filaments increased and MWNTs became gathered in the fibers.
Growth and Application of High Quality ZnO Films Grown on Diamond Substrates
Authors: Tang Ke , Wang Lin Jun , Huang Jian , Zhang Ji Jun , Shi Wei Min , Xia Yi Ben
Published: July 2011

Highly c-axis oriented ZnO films were grown on the nucleation sides of freestanding diamond (FSD) substrates with homobuffer layer by radio-frequency (RF) magnetron sputtering method. The effect of oxygen partial pressure (O2/Ar) on the properties of ZnO films was studied. ZnO-based UV photoconductive detector with planar interdigital (IDT) electrodes was fabricated by the lift off technique. Current-voltage (I-V) characteristics of the detector under ultraviolet (UV) light were measured and discussed.
Ground Movement during Concrete Pipe Piles Jacking in Silt Deposit
Authors: Liu Jun Wei , Zhang Zhong Miao , Liu Nian Wu , Yu Feng
Published: July 2011

In this study a comprehensive field test program was carried out to closely monitor the ground responses during open-ended concrete pipe piles jacking into a deposit mainly consisting of silt soils. The horizontal soil movement due to pile jacking was of depth-dependent characteristic that cylindrical cavity expansion models were unable to capture. The magnitude of displacement decreased rapidly with depth, and no discernible deflection was measured below the depth of the pile tip. The maximum displacement along the depth occurred at clayey-silt layer with relative lower permeability. The rebound of soil movement may be attributed to the setup effect following the piling stage.
Establishment of Ink Penetration Model and the Calculation of Penetration Depth inside Paper
Authors: Yang Yong Gang , Hu Shu Hua , Liu Fu Ping
Published: July 2011

To study deeply ink penetration condition inside the paper, an ink penetration model on the basis of Kubelka-Munk theory is built up in the paper, and infer out the formula of ink penetration depth, consisting of paper thickness and various brightness. And then the test value and calculation value of ink penetration depth are compared. The study results show that the two values are almost the same, so the state of ink penetration depth can be effectively estimated just by paper brightness.
Thickness Dependence of Electrical Properties in Poly(vinylidene Fluoride Trifluoroethylene) Copolymer Thin Films
Authors: Tian Li , Yuan Sheng Zhao , Sun Jing Lan , Meng Xiang Jian , Wang Jian Lu , Yang Jing , Bai Wei , Chu Jun Hao
Published: July 2011

The effect of the thickness on the dielectric and ferroelectric properties of poly(vinylidene fluoride trifluoroethylene) [P(VDF-TrFE)] copolymer thin films were investigated. The results show that the dielectric constant and tunability increase while the coercive field decreases with increasing film thickness. The film thickness also affects both the reversible and irreversible Raleigh parameters in the ac field dependence of dielectric constant. The observed phenomenon can be explained by the existence of interfacial layers between electrodes and film. No obvious thickness-dependent microstructure and ferroelectric transition temperature was observed.
Definition of Cohesive Zone in COREX Melter Gasifier Using Image Processing Method
Authors: Han Li Hao , Luo Zhi Guo , Zhou Xiao Lei , Di Zhan Xia , Sun Jun Jie , Zou Zong Shu , Zhang Yu Zhu
Published: July 2011

The cohesive zone plays very important role in the operation of COREX melter gasifier, up to now, definition of the cohesive boundary has always been a challenging task. In this paper, a two-dimensional hot model of melter gasifier, in which paraffin and corn are used to simulate DRI, coke and lump coal respectively, has been established to study the cohesive boundary in this paper. While the whole experimental process is recorded by the high-speed camera, the image processing method is put forward to define the cohesive boundary quantificationally.
Cracking Mechanism of RCC Dam Surface and Prevention Method
Authors: Zhu Zhen Yang , Qiang Sheng , Liu Min Zhi , Wang Hai Bo
Published: July 2011

Using low placement temperature and proper water pipe cooling water, the cracks are rarely appears in the interior of the dam, but the surface of the dam is prone to cracking. During the construction, the surface of the dam may be wet due to several factors such as creep, maintenance and so on, so the effect of the heat preservation is always been over-estimated. For those concrete blocks constructed in cold season, without proper heat preservation, the cracks are easy to appear soon after construction. For those concrete blocks constructed in hot period, under the influence of air temperature, the temperature of those concrete within about 5.0m of the dam surface are hard to control. So the key point to prevent the dam surface constructed in cold period is to take heat preservation measure suiting the on-the-spot situation. And for those dam blocks constructed in hot period, water cure on the surface of the dam can greatly reduce the risk of dam surface cracking.
Effect of Ultrasonic Vibration on Friction and Wear Properties of GCr15/45# Steel Frictional Pairs under Oil Lubrication
Authors: Qiao Yu Lin , Yang Shan Lin , Zang Yan , Wang Dong
Published: July 2011

Ultrasonic vibration friction and wear experiments were carried out by MFT-R4000 reciprocating friction and wear tester bonded with ultrasonic device. The surface morphologies of wear scars were examined by scanning electron microscope (SEM). The influences of ultrasonic vibration on friction reduction and anti-wear properties of GCr15/45# steel frictional pairs under different loads were discussed. The experimental results showed that, the friction of GCr15/45# steel frictional pairs could be reduced by ultrasonic vibration, and the reduction of friction coefficient became more obvious as the loads increasing. The friction coefficient measured under ultrasonic vibration is 12% lower than it measured without ultrasonic vibration when the load was 50N. However, the wear of frictional pairs increased under ultrasonic vibration, and the amplitude of wear volume enlarged with the loads increase, which is 63% at the load of 50N.
Numerical Simulation of Temperature Field of Direct Laser Metal Deposition Shaping Process of Titanium Alloys
Authors: Kong Yuan , Liu Wei Jun , Wang Yue Chao
Published: July 2011

In order to control the thermal stress of forming process, based on “element birth and death” technology of finite element method, a numerical simulation of three-dimensional temperature field and stress field during multi-track & multi-layer laser metal deposition shaping(LMDS) process is developed with ANSYS parametric design language (APDL). The dynamic variances of temperature field and stress field of forming process are calculated with the energy compensation of interaction between molten pool-powder and laser-powder. The temperature field, temperature gradient, thermal stress field and distribution of residual stress are obtained. The results indicate that although the nodes on different layers are activated at different time, their temperature variations are similar. The temperature gradients of samples are larger near the molten pool area and mainly along z-direction. Finally, it’s verified that the analysis results are consistent with actual situation by the experiments with same process parameters.
Synthesis, Optoelectronic Property and Application in Optical Memory of a Novel Type Diarylethene Based on a Six Unit
Authors: Liu Wei Jun , Pu Shou Zhi , Fan Cong Bin , Cui Shi Qiang
Published: July 2011

A unsymmetrical diarylethene derivative bearing both indole and phenyl moieties was synthesized. At the same time, its photochromic properties and fluorescence switch were investigated in detail. The results showed that this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light in solution, and its absorption maxima were observed at 625 nm in hexane, upon irradiation with 297 nm UV light. The fluorescence intensity of diarylethene decreased dramatically along with the photochromism from open-ring isomer to closed-ring isomer upon irradiation with 297 nm UV light in PMMA. In hexane solution, the open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 439 nm when excited at 385 nm.This new photochromic system also exhibited remarkable optical storage character.
Research on the Dynamic Performance and Mechanical Model of the Single Rod MRD without Accumulator
Authors: Du Jian Guo , Li Wan Hua , He Yong Sheng , Lv Xue Li
Published: July 2011

In this paper, the dynamic performance of the single rod magnetorheological damper (MRD) without accumulator in different working status is researched, which is a new type of MRD developed by us to apply in the environment of explosion and shock. It is concluded that there is no offset force in the new MRD. The maximum damping force and energy absorption capability increase non-linearly with the excitation current and piston’s velocity. The mechanical model of this type MRD is proposed. By comparison of the results of tests with simulation, it is proved that the mechanical model proposed in this paper can simulate the dynamic performance of the new MRD accurately.
Failure Analysis of Drill Collar Box Fracture
Authors: Li Fang Po , Liu Yong Gang , Lu Cai Hong
Published: July 2011

One 203mm drill collar failed infrequently just after 200h of pure drilling time. This paper gives a systematic analysis in consideration of both material quality and loading condition on drill strings. Measurement and inspection were performed on configuration, chemical composition, mechanical performance, metallograghy and micro-fractograghy. It’s thought that the drill collar failure accident was premature fatigue failure accident. Failure reason is the mechanical damage caused by improper manufacture process in the root of thread. Under the effect of fluctuating stress, fatigue cracks originated from mechanical damage position and grew rapidly. When cracks propagated through the wall thickness, drill collar fractured.
Reliablity Analysis of Large-Span Undergroud Cavern Stability in Jinchuan Mine
Authors: Liu Zeng Hui , Gao Gian , Xu Feng Guang
Published: July 2011

According to superposition compression arch structure and the interaction mechanical characteristics of cavern rock, based on limit equilibrium theory, set up reliability analysis model of large-span cavern of a high-stress mine. Using FOSM method determines the reliability index of the large-span and high-stress cavern. By the mean and variance calculations of simplistic variations parameters of construction features, geological investigate and rock mechanics of Jinchuan Mine large-span cavern obtains a suitable jinchuan mine's reliability index formula, and calculates the reliability index()of Jinchuan Ⅲ mine crashing cavern, the minimum value of 1.137. On the assumption that random variables of affecting the stability of the crashing cavern obey normal distribution, and the reliability index()and failure probability()have established relationship. According to the standard normal distribution function can be calculated less than the risk probability()of instability of the structure of 5.87%, that is the stability of the cavern is greater than 94.13% reliability to suffice the stability requirements of the cavern.
A Continuous Fluxless Purification Technique for Mg Scrap Melt
Authors: Zha Ji Li , Xu Shao Yong , You Guo Qiang , Long Si Yuan
Published: July 2011

In the present paper, the current state of magnesium scrap recycling via melt refinement was reviewed and the difficulties confronted in the developing fluxless techniques were highlighted. Then, the working principle of a fluxless technique newly developed in China was briefly introduced followed by chemical and light microscopy investigation of the processing quality of the recycled ingots in comparison with the commercial ingot produced with predominant flux processing to have a first insight into the difference of the two refining techniques. The results indicate that a stable, continuous and cost effective melt refinement can be achieved with the commercial Mg scraps in-house fluxless recycling system.
Sythesis of a Novel Unsymmetrical Photochromic Diarylethene Compound Bearing a Six-Membered Aryl Unit
Authors: Jiang Duo Hua , Liu Gang , Liu Wei Jun , Cui Shi Qiang
Published: July 2011

A novel unsymmetrical diarylethene derivative bearing both indole and thiophene moieties, in which a cyanol group was substituted at the meta-positions of the terminal phenyl ring, was synthesized. At the same time, its photochromic properties and fluorescence switch were investigated in detail. The results showed that this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light both in solution and in PMMA film, and its absorption maxima were observed at 592 nm in hexane and at 607 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. The fluorescence intensity of diarylethene decreased dramatically along with the photochromism from open-ring isomer to closed-ring isomer upon irradiation with 297 nm UV light in PMMA. In hexane solution, the open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 426 nm when excited at 350 nm.
Towards Simulation of Fresh Granular-Cement Paste Material Behavior
Authors: Hoornahad H. , Koenders E. A. B.
Published: July 2011

The mechanical performance and durability of hardened granular- cement paste material such as mortar and concrete are affected by its earlier stage behavior which is defined in terms of consistency and/or workability. Therefore understanding the behavior of the mixture during this early period is a crucial requirement for the technical and economical success of professional production sites. This paper presents a numerical approach based on Discrete Element Method (DEM) to simulate the macroscopic behavior of a fresh granular-cement paste mixture in which the pasty behavior is dominant. The research approach is based on a conceptual idea where the particle-paste interaction system is explicitly modelled by means of a two phase particle interaction system. The effect of the characteristics of paste on the macroscopic fresh behavior of a mixture has been studied and compared by the mini slump cone test regarding the excess paste theory. Modelling and experimental laboratory test results show good agreement.
Study on the Flutter Model of the Imaging Quality of TDICCD Space Camera
Authors: Ye Wei Nan , Dong Ji Hong , Chen Xiao Wei
Published: July 2011

For any On-orbit Space camera, the influence of flutter on the imaging process of TDICCD space camera is inevitable, thus causing the decline of image quality. This paper briefly introduces the principle of TIDCCD camera and how flutter affects the imaging process. Then through the analysis and calculation of practical program, we find the acceleration criterion to avoid the blur of image quality.
Synchronization Analysis of the Double Exciting Motors in Nonlinear Vibration System Based on Reaching Law
Authors: Li Xiao Hao , Liu Jie
Published: July 2011

Based on the dynamic model of the nonlinear vibration system which driven by double exciting motors, the rotate speed difference and phase difference state space equations have been deduced. According to the design feature of the nonlinear vibration system and the vibration synchronization requirement of double exciting motors, the approach control synchronization strategy has been deduced with sliding mode reaching law. The practical examples and tests shows that the reaching law synchronization controller can effectively control the double exciting motors to realize the synchronization movement, and the synchronization controller has stronger robustness. The analysis result can provide the theoretical and test basis for the further exploitation of synchronization vibrating machine.
Photochromism and Optical Storage of a Novel Unsymmetrical Diarylethene Based on Pyrazole and Benzofuran
Authors: Wang Tao Feng , Liu Gang , Cui Shi Qiang
Published: July 2011

A new unsymmetrical photochromic diarylethene of bis (1,3,5-trimethyl-4-pyrazole)ethane and bis(2-methyl-3-benzofuran)ethane was synthesized, its photochromic, fluorescent and optical strorage properties were examined, the result indicated that the diarylethene 1a changed the color from colorless to violet upon irradiation with 297 nm UV light, in which new absorption maxima were observed at 539nm and 556nm in hexane and PMMA film, respectively. This new photochromic system exhibited remarkable fluorescence intensity and clear fluorescent switches by photoirradiation in hexane. The results showed that the cyclization/cycloreversion process of the compound was determined to be the zeroth/first order reaction. This new photochromic system also exhibited remarkable optical storage character.
Identify for Scroll Compressor Noise Using Vibration Signal Based on Neural Network
Authors: Wang Zhen , Chen Da Li , Zhao Hong Jian
Published: July 2011

From the theory of structure-bone sound radiation, the properties of vibration and noise of scroll compressor are analyzed, and the relationship of them is researched. On the basis of the analysis, the feasibility for measuring noise level using vibration signal is demonstrated. Then, the noise radiant efficiency curve is plotted using the test data, and disadvantages of this mean are pointed out. At last, a new method of measuring noise level using vibration signal, which is proved in practice effectively, is presented based on neural network.
Numerical Simulation and Experimental Analysis of an Active Hydraulic Excitation System Based on Pulsating Flow
Authors: Kou Zi Ming , Zhang Hui Xian , Wu Juan , Lu Chun Yue
Published: July 2011

A vibration wave generated actively by hydraulic vibration exciter was studied, and an experimental system based on the theory of water hammer was designed. The new developed vibration exciter is driven by the motor whose rotary speed can be adjusted by frequency converter, by means of which transient pulsating flow is generated regularly. Consequently the piston of hydraulic cylinder is driven periodically with the rotation of vibration exciter. Furthermore, mathematical model was established by the method of characteristics and computer code was developed to calculate numerical solution. The simulation results show that there are different flow velocities distributed at every cross section along the pipe. Measured data is basically consistent with the numerical simulation, which indicates that the vibration parameters of hydraulic cylinder can be controlled effectively.
Numerical Simulation of Double-Deck Metal Cylindrical Tube Crashed under Inside-Explosive Loading
Authors: Wang Shuo , Li Dong Yang , Liu Hai Tao
Published: July 2011

To study the deformation and fracture form of double-deck metal cylindrical tube under inside-explosive loading，the numerical simulation of the deformation and fracture process of double-deck metal cylindrical tube under inside-explosive loading of TNT was performed by LS-DYNA, and the fragment number and mass statistics software code is developed. The results showed that, with different length of TNT and detonating position the fragment number and mass is greatly different . The result can be a consult to some practicalities like the cannonball exploded in the gun barrel during shoot.
Research on Fault Diagnosis for Rotating Machinery Vibration of Aero-Engine Based on Wavelet Transformation and Probabilistic Neural Network
Authors: Wu Wen Jie , Huang Da Gui
Published: July 2011

Fault feature extraction using wavelet decomposition and probabilistic neural network fault diagnosis technology is presented in this paper. Fault diagnosis based on wavelet transformation and neural network data fusion is studied. The fault diagnosis in rotating machinery vibration of the aero-engine is simulated in Matlab. Our recent investigations demonstrate that using wavelet decomposition extract fault characteristics of the energy vector has strong generalization ability and anti-noise ability. Integration of the wavelet and neural network application can provide a better classification of diagnosis results, reliability and accuracy. This technique is suitable for the mechanical vibration fault diagnosis applications of steam turbine and gas turbine.
Photochromism of a New Unsymmetrical Diarylethene Bearing both Thiazole and a Methoxyl Group
Authors: Li Hui , Pu Shou Zhi , Cui Shi Qiang
Published: July 2011

A new unsymmetrical isomeric diarylethene bearing an electron-donating methoxyl group atortho-positions of the terminal phenyl ring was synthesized, namely 1-(2,4-dimethyl-5-thiazolyl) -2-[2-methyl-5-(2-methoxyphenyl)-3-thienyl]perﬂuorocyclopentene (1o). The compound displayed excellent photochromism both in solution and in PMMA film. The isomeric compound also functioned as a ﬂuorescence switch by photoirradiation in solution. In addition, cyclic voltammetry tests showed that the electron-donating methoxyl group at the terminal benzene ring had a signiﬁcant effect on the electrochemical properties of the isomeric diarylethene.
Dynamic Performance of the Bearing-Rotor System in the Ultra-High Speed Electric Spindle with a Additional Supporting System Make up of the Permanent Magnetic Bearings
Authors: Li Song Sheng , Mao Hua Wei , Chen Ping , Huang Xiao , Zhou Peng , Chen Jian
Published: July 2011

A novel method, aiming at solving the problem that the ultra-high-speed electric spindle tends to vibrate as its stiffness is small, using the repulsion of permanent magnets based on the theory that repulsion increased while the two magnets come close, is provided in this paper to design a electric spindle within additional support bearing system consist of two radial permanent magnet rings against each other. This paper also analyses the dynamic performance of radial permanent magnet bearings additional supporting system for ultra-high speed electric rotor system, result shows that the radial permanent magnetic bearings additional supporting system designed for improving the critical speed of the rotor system, reducing the rotor radial dynamic response, can effectively improve the dynamic performance and operational stability of ultra-high speed electric spindle rotor system.
The Limitation of Evaluating Thermal Shock Resistance of Al2O3-SiO2 Refractory by Measuring Strength Loss Rate
Authors: Liu Xin , Qu Dian Li , Li Zhi Jian
Published: July 2011

This paper deeply studied the limitation of evaluating the thermal shock resistance of Al2O3-SiO2 refractory by measuring Strength Loss Rate (SLR). By means of supersonic, X-ray diffraction (XRD), the results were drawn as followed.1)After the thermal shock experiment for mullite based A-S refractory, which were composed by mullite and corundum, the supersonic velocity slowed down as it going through the sample while the cold crushing strength abnormally increased at initial state.2) The strength increased remarkably with the ascending of mullite fraction.3)It is inadequate to evaluate the thermal shock resistance of mullite based A-S refractory by strength loss rate.
Research of Laser Welding for Hot Rolling Strip Steel
Authors: Zhong Ru Tao , Huang Zhi Jun , Wang Yu Tao
Published: July 2011

Focused on the question of laser welding break of hot rolling strip steel JZZ, The causings of defect of laser welding were studied experimentally with the Trumph TLF12000 fast-flow CO2 laser,. and the methods of avoiding the defect were porposed. The results showed that owing to the steel plate was thicker and big welding velocity, resulted in large depth/breadth ratio and high cooling velocity , the solidification crack occurred during welding process. When the method of laser welding with filling metal was used,the welding defect was avoided , the better performance index of weld as good as that of base metal is available.
Policy Planning for Environmentally Sustainable Transport in Beijing, China
Authors: Wang Zhen , Yu Shu Xia
Published: July 2011

Beijing suffers a great road transport problems, including environment pollute, congestion, and etc. A research supported by the national basic research program of China to solve transport related environmental problems introduced an environmentally sustainable transport research framework. Results showed that the dramatic increasing of total vehicles was the key driving force. NOx and CO2 emitted by vehicles were two main pollutes that might touch the environmental capacity in 2020. Policy instruments were proposed to control the total vehicle, the NOx emission and the CO2 emission. The time arrangement of policy instruments was partly accepted by the local government. Continuous monitoring showed that the effects of the policy planning were mixed.
Effect of Plasma Nitriding on Ultra-High Cycle Fatigue Behaviors of Ti-6Al-4V
Authors: Tian Ren Hui , Ouyang Qiao Lin , Wang Qing Yuan
Published: July 2011

In order to investigate the effect of plasma nitriding treatment on fatigue behavior of titanium alloys, very high cycle fatigue tests were carried out for Ti-6Al-4V alloy using an ultrasonic fatigue machine under load control conditions for stress ratios of R=-1 at frequency of ƒ=20KHz. Experiment results showed that plasma nitriding treatment played the principal role in the internal fatigue crack initiation. More importantly, plasma nitriding treatment had a detrimental effect on fatigue properties of the investigated Ti-6Al-4V alloy, and the fatigue strength of material after plasma nitriding treatment appeared to be significantly reduced about 17% over the untreated material.
CAD/CAM of the SPROCKET and the EFFICIENCY TEST
Authors: Chang Shinn Liang , Jiang Cho-Pei , Tasi Feng Ying , Hong Xin Bao , Chi Chen Cheng , Shao Cji Wei
Published: July 2011

In this paper, the CAD/CAM of tooth profiles of DIN, BS, JIS S, and JIS U sprockets are investigated. In order to verify the process and investigate the efficiencies of the sprockets, an experimental test rig is set up to evaluate the efficiencies of different shapes of sprockets. Applying the theory of gearing and coordinate transformation, the mathematical models of DIN and BS types of sprocket are derived comparing with JIS S and U typed sprocket. The MasterCAM software is used to simulate the cutting process of sprocket. The manufactured sprockets are tested in the developed test rig to show the efficiencies of different types of sprockets. The algorithm developed in this paper can also be applied to study others new shapes of tooth profiles.
Experiment Study on Influence of Knowledge Acquisition Ability on Product Innovation Quality
Authors: Liu Ming Zhu , Hu Yang , Zhang Xiao Dong
Published: July 2011

Aiming at the characters of product scheme innovation, the influence of the knowledge acquisition ability on the innovation quality is studied by experiments. The innovation quality evaluation indices are established from three layers: product parameters development, scheme innovative, and scheme integrity. Experiment hypotheses are proposed, experiment variables and tasks are designed. Experiment results show that there is significant influence of the knowledge acquisition ability on the innovation quality, and participants with higher knowledge acquisition ability can refer more knowledge and have more analogy and association behaviors.
Reliability Study on Physical Layer of CAN Bus in Engineering Application
Authors: Kuang Fu Hua , Xu Bu Gong , Liu Gui Yun
Published: July 2011

In power plants and other complex industrial application fields, incomprehensive design can make the system less durable. The fault of the fieldbus, in principle, comes from the physical layer, whose lay-out directly affects the fieldbus’s reliability. This article discusses from four aspects on how to improve the reliability of the physical layer of CAN bus, which include the selection of cables and connectors, the length of the bus and branch lines, the matching method of terminal resistor, and the interface circuit of hardware. Furthermore, the article presents the plan of using H-bridge type matching terminal, which aims at solving signal-reflection problems. Finally, the theory is verified through the application of intelligent electric actuator with the CAN bus.
Study on Antenna Structure Technology for Realizing Passing Zenith Tracing
Authors: Gong Zhen Bang , Shen Long , Liu Liang , Cao Yi , Lu Wen Jie , Li Yu
Published: July 2011

This paper introduced the important role of the remote sensing satellite in remote sensing field. There existed some defects for a traditional classical AZ-EL type antenna used in tracking remote sensing satellite. The design project of Stewart manipulator antenna was presented by Stewart manipulator designing theory. The singular configuration theory of Stewart manipulator introduced position singularity, attitude singularity analysis and posture ability of Stewart manipulator was studied. The theorem of nonsingular posture was presented and proved. The nonsingular workspace area of a Stewart manipulator was determined. The antenna design based on Stewart manipulator satisfied with hemisphere airspace workspace and got the theoretical basis of realizing passing zenith tracing.
PLC Sequence Control System of Special Drill Machine
Authors: Jia Yu Jing , Cheng Yuan Bo
Published: July 2011

This paper introduces a special drill machine for machining flange hole. Base on design project Specifications, discussed system compose and machining requirement. Design actuator and hydraulic system. The electric control system chooses programmable controller, according to the logic relation of processing request, design control programs with the sequence function chart, analyzed the processing cycle technological process. Point out that using the sequence function chart to design special drill machine control programs, it is logical and adaptable and also convenient on changing the programs. The programmable controller is just designed for industry control, so it is reliable and anti-jamming.
Research on Virtual Design System for Spindle of High-Speed Machining Center
Authors: Qin Jun Jun , Yin Yang , Dong Cui Yun
Published: July 2011

Aiming at the question of high-speed spindle’s long development cycle, take the structural design and the performance analysis of cnc machining center’s high-speed spindle system as key points, use the cad technology, fea technology,dynamic simulation technology and virtual design theory, and integrate them into an integration technology, the virtual design and analysis software system devoted to the cnc machining center’s high-speed spindle was developed too, and gave parts of the operating instance. Through the practical application in one large-scale enterprise of machine tool, the fea sibility and practicability of proposed system principle and implementation techniques were verified, and the better design quality and higher efficiency were shown too.
Velocity Measurement Based on Alternate M/T Method and Incremental Optical Encoder
Authors: Liu Zhe , Li Jie , Ke Yan , Zhao Yi , Liu Jun
Published: July 2011

The accuracy and real-time of velocity measurement impact on the performance of the motor servo system. Incremental optical encoder measuring velocity have advantages of high accuracy and easy-to miniaturization. The typical method for velocity measurements by Incremental optical encoder is hybrid M / T method. The method is poor in real time. Raised alternate M/T method for velocity measurement. Design the software and hardware for the M/T method. The experiment results show the feasibility and correctness of the system, and the method improves the system with photoelectric encoder in real time.
Synthesis and Characterization of Polymethylsiloxane with Pendant Fluorocarbon Side Chains
Authors: Liu Hu , Fu Bao Song , Shang Qian Qian , Xiao Guo Min
Published: July 2011

For the purpose of combining the properties of polymethylsiloxane and fluorinated compound, hexafluorobutyl mathacrylate (HFBMA) was grafted to polymethylhydrosiloxane (PMHS) by hydrosilylation reaction in the presence of Karstedt’s catalyst. The prepared polymethylsiloxane with pendant fluorocarbon side chains (PMHS-g-HFBMA) was characterized by FTIR, 1H NMR and TGA. The results showed that the expected product was successfully formed. The surface property and solubility of the product were also investigated.
Research on the Wireless Multi-Point Temperature Acquisition and SD Card Memory System
Authors: Zhang Guang Zhi , Yue Da Jun , Ding Feng Li , Xie Yan Qun
Published: July 2011

Combining the low power loss technology with SD card, this system is designed, which is convenient for us to obtain the temperature data of the environment and in which the temperature acquisition module and the data receive memory module are included. The temperature acquisition module is responsible for transmitting the acquired valid temperature value into the data receive memory module by wireless, while the data receive memory module mainly stored the received effective data into SD card after being processed. With the wireless temperature acquisition system, it is convenient for us to acquire and record the multi-point temperature values from the environment.