bluuebunny/crossref_metadata_2025 huggingface dataset:
The Influence Factors and Enhancement Measures of the Quality of Well Cementation in the Hai-La-Er Area
Authors: Xia Yao Xian , Wang Hong Bin , Wang Da , Zhao Wen Xiu
Published: March 2013

This article aims at the geology situation of Hai-la-er area, researches the influence factors of the quality of well cementation in the Hai-la-er area., establishes, improves and perfects the improvement measures of enhancing the quality of well cementation in the Hai-la-er area, and also produces notable effects in the filed test. In 2004, there were 11 well cementations in all and 5 of them were of high grade. The average sealing section was 1537 meters, and the factor of merit was 45.45%.
Analyzing Resonant Frequency of 1-3-2 Piezoelectric Composite with Multi-Mode
Authors: Cai Da Ke , Wang Li Kun , Qin Lei , Lu Yu , Zhou Jing Jing
Published: March 2013

1-3-2 piezoelectric composite has been widely used in the field of underwater acoustic transducer. In this paper, Series-parallel model is used to make the theoretical derivation of the resonant frequency of 1-3-2 piezoelectric composite. By using numerical calculation the law of the frequency varying with the cutting depth is gained. It provides theoretical basis for the design of the 1-3-2 piezoelectric composite with multi-mode.
The Effects of Small System on the Type I Antifreeze Protein ‘HPLC-6’
Authors: Li Li Fen , Liang Xi Xia
Published: March 2013

According to Hill’s thermodynamics theory for small system, the effect of small system on the type I antifreeze protein ‘HPLC-6’ is discussed in this article. We conclude that when the solution is very dilute, the effect is not visible, and as the concentration increases, the effect becomes more visible than before, and the result also shows that the number of molecules on the ice surface becomes larger when the effect of small system is considered.
Alginate-Based Multi-Membrane Hydrogel for Dual Drug Delivery System
Authors: Wei Shi Jun , Zhang Meng , Li Lei , Lu Lu
Published: March 2013

Multi-membrane hydrogels are newly promising carriers in biomedical fields for their gentle gel condition and excellent biocompatibilities. In this study we focused on the dual control release property of alginate-based onion-like multi-membrane hydrogels hybrid with polylactic acid microspheres. The results indicated that the PLA microspheres evenly distributed in each of the hydrogel membranes. And the drug delivery in physiological saline is well controlled which can be promising in transport drugs, genes, protein, etc.
Synthesis and Properties of Polyimides Containing Tert-Buty Group
Authors: Lu Yun Hua , Pan Peng , Wang Bing , Zhao Hong Bin , Hu Zhi Zhi
Published: March 2013

Two diamine monomers 2-tert-butyl-1,4-bis(4-nitro-2-trifluoromethylphenoxy)benzene and 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene were reacted with the alicyclic dianhydride monomers 1,2,3,4-cyclobutanetetracarboxylic dianhydride to synthesize the poly(amic acid)s, and then obtain the corresponding polyimide films through thermal imidization. The structure and properties were characterized by fourier transform infrared spectroscopy (FT-IR), ultraviolet visible spectroscopy (UV-vis), thermogravimetic analysis (TGA), solubility test and so on. The effect of introduction of bulky tert-butyl and trifluoromethyl to the polyimide backbone on the properties of polyimide films was investigated. The experimental results showed that polyimides with tert-buty group exhibit excellent solubility, but their thermal and optical properties decreased slightly.
Cross Coupling Effect in Multi-Element Composites for Transducer Array Application
Authors: Qin Lei , Wang Li Kun , Lu Yu , Zhou Jing Jing
Published: March 2013

A novel three-phase (ceramic, epoxy resin and decoupling material) piezoelectric composite with multi-element in parallel connection has been developed by using dice-fill technology. This kind of composite consists of a large number of elements which can be seen as a single-sound radiation source. The space between elements is determined via a precise method of calculation. The ceramic elements are then cut using precision machinery to achieve exact results. A kind of decoupling material has been developed to decrease the cross coupling effect between elements. The vibration velocity curves of active elements and close elements were measured using a Scanning Laser Vibrometer (Polytec PSV-400). The results indicated that the decoupling materials induced in multi-element composites have a good decoupling effect. Vibration attenuations between adjacent elements are larger than 31 dB at resonance frequency.
Preparation of Friction Materials by Solution Mixing Based Palygorskite Nanometer/PF Composite Resin and Tribological Behavior of Four Kinds of Woven Friction Materials
Authors: Zhang Da Bin , Wei Jian Yu , Li Can Li , Cao Yang
Published: March 2013

Palygorskite/tung oil phenolic complex material (MP) was prepared by means of solution mixing. The scattered state of the nano-particles was characterized by transmission electron microscope (TEM). The heat resistance of which MP and SP were prepared by means of in-situ polymerization and boron modified palygorskite nanometer composite resin (BP) and P0.0 without palygorskite nano-particles were contrasted and analyzed by SETARAM TG-DSC92-16, and the four friction materials separately made of MP, SP ,BP and P0.0 were used for tests of friction by the DMS-1. The results show that palygorskite nano-particles with 0.7% in MP have fair dispersibility, and the thermal weight loss of MP compared with P0.0 falls 6%. Its heat resistance closes to SP’s and is with 50°C higher than P0.0’s. So the MP has good tribological behavior.
Acoustic Characters Study on the Influence of Micro-Fillings in Underwater Sandwich Composite Structure
Authors: Luo Zhong , Hu Jun Bo
Published: March 2013

Sandwich composite is a new structure of acoustic stealth structure, implementing both loading and acoustic stealth. Micro-fillings can improve the sandwich absorption coefficient. The influence parameters are studied by absorption theories analysis of sandwich structure. The absorption and reflection coefficient in different categories, size and layers of fillings are analyzed by pulse tube experiments. The results shows that the first absorption peak moves to low frequency by adding fillings, the peak frequency are lower when the fillings size increase, and the absorption coefficient are higher when the thickness of sandwich layers are closed.
Interface Parameters of Composite Materials with an Elliptical Cross-Section Fiber Bundle
Authors: Xie Zhi Min , Chai Dong Liang , Du Hai Wen , Miao Chang Qing
Published: March 2013

How to design the interfacial properties is a significant fundamental issue in the field of the composite materials, while little work was concerned with the mechanical design of the interface for the fiber reinforced polymer. In the present work, a fiber bundle embedded in the matrix was described as a transversely isotropic material. Based on the imperfect interface conditions, the interface parameters were derived to satisfy the neutral conditions for the composite materials reinforced by the elliptical cross-section fiber bundle. It is found that the interface parameter is not always associated with the applied loading in the case of the anti-plane shear. In the state of equal-biaxial tension, the normal interface parameter is merely related to the mechanical properties of components except for the shape of the fiber bundle, but independent of the loading magnitude. In the other cases of pure shear and uniaxial tension, the neutral interface does not exist except that the fiber bundle has a circular cross-section. It is also found that the interface parameters can be expressed in the forms similar to that for an isotropic inclusion by using Kolosov constant in the in-plane deformations.
The Properties of the Composites of Bamboo Flour and PVC
Authors: Zeng Guang Sheng , Chen Lei , Lin Rui Zhen , Meng Cong
Published: March 2013

The composites based on polyvinyl chloride (PVC) and bamboo flour were made by extruded molding. The effects of the bamboo flour content on the composite physical properties were examined. The result showed that the composite mechanical properties were due to bamboo flour content. At the same time, we also make sure the process temperature and the proportional relationship between feed rate and screw speed is 1:2.
Fatigue Stiffness Degradation Behaviour of Woven Composite π Joint
Authors: Fu Yue , Zhao Li Bin , Zhang Jian Yu
Published: March 2013

Fatigue stiffness degradation behaviour of woven composite π joint subjected to tensile-tensile cycle loading is studied. Because of the complex structural configuration of woven composite π joints and a variety of failure modes, there exhibited four stiffness degradation modes in fatigue test. For example, stable slight reduction mode, abruptly decreasing mode, step decreasing mode and constant stiffness mode. Each stiffness degradation mode has a corresponding failure mode in fatigue test.
Morphology Control of SAPO-11 and SAPO-47 Crystals in the Presence of Diethylamine
Authors: Xu Xin Tong , Zhai Jian Pang , Li Irene Ling , Ruan Shuang Chen
Published: March 2013

SAPO-11 and SAPO-47 crystals have been synthesized using diethylamine (DEA) as the structure-directing agent (SDA) and their morphology have been controlled successfully by varying aging duration. The single crystals were obtained in a short aging duration while film and island-like crystals were obtained in a long aging duration. The effect of SiO2/Al2O3 ration and content of HF on SAPO-47 crystals have been investigated. High molar ration of SiO2/Al2O3 and high content of HF is tend to synthesize larger crystals of SAPO-47. All the samples were characterized by XRD and SEM.
Grafting Polymerization of D,L-Lactide on the Surface of Halloysite Nanotubes
Authors: Li Jing Jing , Luo Bing Hong , Zhang Jin Xi , Huo Ru Qiu , Zhou Chang Ren
Published: March 2013

Halloysite nanotubes (HNTs) surface-grafting poly(D,L-lactide) (g-HNTs) were synthesized by bulk ring-opening polymerization of D,L-lactide using stannous octoate as catalyst and HNTs as co-initiator. Fourier transform infrared (FTIR), thermal gravimetric analysis (TGA), X-ray diffraction (XRD) and zeta potential measurement were employed to elucidate the structure and properties of HNTs before and after grafting with D,L-lactide. FTIR spectrum certified the existence of poly(D,L-lactide) chains on the surface of g-HNTs. The amount of surface-grafted poly(D,L-lactide) measured by TGA was 4.6% in weight. The grafted poly(D,L-lactide) chains on the surfaces of HNTs can relieve the clustering effect of HNTs to some extents.
Synthesis of Three-Dimensionally Interconnected Hierarchical Meso/Mesoporous Tb3+ Doped Titania with Enhanced Photocatalytic Activity
Authors: Yin Wei , Shi Lei , Zhao Dan Hua , Zhang Xiu Lian
Published: March 2013

The precursor was prepared by cohydrolysis reactions of Ti(OC2H5)4and Tb(OC2H5)6around micelles of cetyltrimethylammonium bromide processed by ultrasonic before the cohydrolysis reactions. After calcined the precursor, Terbium doped anatase with a three-dimensionally interconnected hierarchical meso/mesoporous structure had been successfully prepared using an ultrasonic-assisted routine of sol-gel. The three-dimensionally interconnected hierarchical meso/mesoporous structure of the prepared material was proved by high resolution transmission electron microscopy and N2adsorption-desorption analysis. The material prepared displays a pore width distribution curve of single peak at 17.8 nm and displays a range from 6 nm to 42 nm, and possesses a BET area of 105 m2/g and a porosity of 0.65 cm3/g. The results of XPS analysis show that Ti exists in the Ti4+form and Ti-O-Tb/H and Ti-O-Ti bonds exist in the surface of the mesoporous material prepared. The terbium-doped sensitive material prepared possessing a three-dimensionally interconnected hierarchical meso/mesoporous structure is conducive mass-transferring and light-harvesting, and shows that a photocatalytic activity for phenol is about 4.9 times than that of commercial P25 titania under a very weak UV-Vis irradiation condition.
Experimental Research on Mechanical Characteristics in the Process of Nanoscale Sliding Contact
Authors: Liu Yan Rong , Yang Xiao Jing , Yang Cheng Ming
Published: March 2013

The experiment of mechanical characteristics of sliding contact in nano-scale was researched using nano-indenter. The displacement-friction curves with different loads and sliding velocities were given through the contact effect between diamond indenter and mono-crystalline silicon test-coupon. The three-dimensional AFM morphologies were obtained through scanning contact area by AFM. The research shows that the contact-force and friction increase along with the increment of loads, in condition of sliding with different loads. The friction increases along with the increment of sliding velocity, in condition of different sliding velocities. Otherwise, furrow destruction along with obvious plastic flow is generated with low sliding velocity (100μm/s). However, the oddments accumulate obviously on the verge of nick with high sliding velocity (above 100μm/s), and the phenomenon of oddments accumulating is more obvious along with the increment of sliding velocity.
Ultra-Long Life Fatigue Behavior of Welded Joints with Shot Blast Treatment
Authors: He Chao , Liu Yong Jie , Wang Qing Yuan
Published: March 2013

In order to investigate the ultra-long life fatigue properties of welded joints, ultrasonic fatigue tests of base material and welded joints were carried out using Q345q steel in ambient air at room temperature with a stress ratio R=-1. The results showed that the fatigue strength of specimens with welded joints dropped about 60% compared with that of base steel. To improve the fatigue properties of welded joints, two groups of specimens were treated by shot peening with different degrees which produced different compressive residual stresses on samples. It was found that the shot peening treatment could improve the fatigue strength of welded joints obviously. The fatigue fracture surface was analyzed by scanning electron microscopy. The fractography showed that there were two kinds of crack initiation mechanism in the Q345q base steel, crack inition from defects on the surface for high cycle fatigue failure and in the interior of the sample in very high cycle fatigue range. However, almost all cracks of welded joints initiated from defects caused by welding process. The failure of welded joints usually happened at the section of welded toes in the area of fusion or geometric discontinuity.
Preparation and Characterization of Aligned Carbon Nanotube Fibers
Authors: Luo Yong Feng , Zhou Cui , Li Xi , Li Shui , Sheng Zhong Zhi
Published: March 2013

High-quality carbon nanotube (CNT) arrays have been synthesized through a chemical vapor deposition process. The Fe/Al2O3 on silicon was used as the catalyst, ethylene as the carbon source, and a mixture gas of Ar and H2 gases as the carrying gas. With spinnable CNT arrary as initial materials, aligned carbon nanotube fibers were continuously fabricated by dry spinning. And then we study the excellent mechanical property of the carbon nanotube fibers.
The Electrical Potential Distribution in the Hetero Structure during the Growth of the Electrodeposition Nano
Authors: Wei Li
Published: March 2013

It nanometer is today one of the hot areas of research,through electrodeposition method manufacturing Orderly structure With metal and semiconductor properties, Micron from the magnitude of nanotechnology potential direct impact on the distribution of morphology,So conductive pushing the situation on the potential distribution is particularly important.This means using mathematical derivation of the potential distribution of analytical expressions,A reasonable explanation of the prospective growth of 2 dimensional nanostructures structure morphology,The theoretical analysis for the future laid the foundation.
Electrochemical Synthesis of Copper Sulfide Nanostructure with PAM Hydrogel Template
Authors: Yang Wen Tao , Zhang Long Fei , Liu Fa Jia , Li Xiao Yun
Published: March 2013

Flower-like, sphere and lamellar structures of copper sulfide have been prepared by an electrochemical method with PAM hydrogel as template. The unique synthetic method required no multiple growth steps typical of other methods, and just utilized the electric currents to drive the ions to realize the controlling the resultant morphology in the PAM hydrogel system. The structure of product was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The morphology of these structures could be controlled by adjusting the content of PAM in hydrogel, and the intension of electric current.
The Abnormal Deformation Behavior of B340/590 DP Steel at Elevated Temperature
Authors: Guo Yu Qin , Han Juan Juan , Zhao Meng , Chen Wei , Chen Long
Published: March 2013

A series of warm tensile tests for B349/590DP steel are performed at the stain rates of 0.0004/s, 0.001/s, 0.01/s and 0.08/s in this paper. From the test data, it is found that the effect of temperature and strain rate on material’s deformation behaviors is opposite to that of other temperature ranges. And with the change of strain rate and temperature, the relations between the material parameters such as the work-hardening exponent n, the stress hardening coefficient K and forming process conditions becomes uncertain. Moreover, authors investigated the reasons for above phenomena. Research results demonstrate that it is very necessary to appropriately optimize the warm forming process scheme and strictly control the warm forming process parameters so that both the formability and safety performance are considered simultaneously.
Investigation on Behavior of the early Stage of Aging in C17200 Alloys
Authors: Lou Hua Feng , Wang Qiang Song , Xie Guo Liang , Peng Li Jun
Published: March 2013

An investigation on behavior of the early stage of aging and its influence on theperformance of C17200 alloys is conducted in this paper. It is indicated that spinodal decomposition occured when the specimen is aged at 320 °C ,leading to the formation of G.P zones. A phase transformation from metastable precipitates to stable phase occurred with the increasing aging time, the sequence of which is believed as G..P→γ′′→γ′→γ. Spinodal decomposition and ordering of the matrix are found together in C17200 alloy.
Preparation and Hydrogen Storage Kinetics of Nanocrystalline and Amorphous Mg2Ni-Type Alloys
Authors: Zhang Yang Huan , Zhao Chen , Wang Haitao , Yang Tai , Shang Hong Wei , Zhao Dong Liang
Published: March 2013

In order to obtain a nanocrystalline and amorphous structure in the Mg2Ni-type alloy, the melt spinning technology has been used to prepare the Mg20Ni8M2 (M = Co, Cu) hydrogen storage alloys. The microstructures of the alloys were characterized by XRD, SEM and HRTEM. The effects of the melt spinning on the gaseous and electrochemical hydrogen storage kinetics of the alloys were investigated. The results indicate that the as-spun (M = Co) alloys display a nanocrystalline and amorphous structure as spinning rate grows to 20 m/s, while the as-spun (M = Cu) alloys hold an entire nanocrystalline structure even if a limited spinning rate is applied, suggesting that the substitution of Co for Ni facilitates the glass formation in the Mg2Ni-type alloy. The melt spinning remarkably ameliorates the gaseous hydriding and dehydriding kinetics of the alloys. As the spinning rate is raised from 0 (As-cast was defined as the spinning rate of 0 m/s) to 30 m/s, the hydrogen absorption saturation ratio ( ), a ratio of the hydrogen absorption capacity in 5 min to the saturated hydrogen absorption capacity, are enhanced from 80.43% to 94.38% for the (M = Co) alloy and from 56.72% to 92.74% for the (M = Cu) alloy. The hydrogen desorption ratio ( ), a ratio of the hydrogen desorption capacity in 20 min to the saturated hydrogen absorption capacity of the alloy, are increased from 24.52% to 51.67% for the (M = Co) alloy and from14.89% to 40.37% for the (M = Cu) alloy. Furthermore, the high rate discharge ability (HRD) and the hydrogen diffusion coefficient (D) of the alloys notably mount up with the growing of the spinning rate.
Investigation on the Optical Performance of Co and Al Co-Doping ZnO Films
Authors: Song Gen Zong , Zhang Duo
Published: March 2013

ZnO is a novel kind of semiconductor material, which has hexagonal Wurtzite crystal structure, with a wide band-gap of 3.37eV at room temperature. It owns a large excitation binding energy of 60meV and excellent room temperature stability. ZnO has very useful properties of piezoelectricity, gas & pressure sensitivity etc. Therefore, application researches on low dimensional ZnO materials have become hot topics and significant values.In this paper, ZnO doped thin films were prepared by sol-gel method. Zn (CH3COO)2•2H2O was employed as the precursor, anhydrous alcohol was the solvent, monoethanolamine was the complexant, Co(CH3COO)2•4H2O was used as the source of the Co-dopant, Al(NO3)3•9H2O was used as the source of the Al-dopant in the experiment to yield the doped ZnO films. The sample preparation spin coating number is 6, the average grain size is in nanometer level, and the thermal treatment temperature is 450, 500, 550, 600°C, respectively. The effect of the doping proportion on the crystallization and energy band structure of the ZnO thin films were characterized by X-ray diffraction (XRD), the Infrared spectrum and the ultraviolet-visible transmission spectra (UV-Vis).The results show that the crystalline grain size of the ZnO doped films grown on glass substrates increases, since the thermal treatment temperature rise. In this paper, a best ZnO doped film was obtained at the temperature of 600°C. It preliminarily analyses that Co-doped ZnO films present a absorption peak in infrared area when the thermal treatment is at 550°C. Al or Co doped ZnO films can cause a redshift of ultraviolet absorption peaks. Energy gap is around 3.2eV when doped. The ultraviolet absorption peaks of Al-doped ZnO films will have a shift to high energy, since it has a better crystallinity.
The Influence of Electrochemical Anodization for Porous Silicon Microcavity Fabrication
Authors: Zhang Hong Yan , Lv Xiao Yi , Jia Zhen Hong
Published: March 2013

The present work reports the electrochemical anodization for porous silicon microcavity (PSM) fabrication, including the number of layers and electrochemical process effect in the optical response quality of PSM. These PSMs have been obtained by using PS technology. It is found that the electrochemical process limits the maximum number of layers because there is a chemical dissolution effect during electrochemical anodization. The reflectance spectra of the PSMs indicates that stop-band and the resonant peak of the PSM shift down with the increases of the number of layers due to the decrease of layer's thickness. The value of the full width at half maximum (FWHM) dependents on the number of layers, and the number of layer increases when the FWHM decreases, which is due to the light scattering at roughness interface layer.
Numerical Examination of Mixed Mode Crack in SSY: A Review
Authors: Godse Prasad S. , Gawande Sangram A. , Bhat Sunil
Published: March 2013

The paper reviews the numerical methodology to investigate fracture parameter namely energy release rate, G, of a mixed mode crack. An inclined, through, centre crack is assumed in a ductile steel plate subjected to bi-axial tension. Applied stress and crack size are suitably selected to simulate small scale yielding (SSY) condition at the crack tips. The cracked plate is modelled by finite element method. Both plane stress and plane strain situations are examined. G value is found from J integral. Equations of transformation are employed to obtain normal and shear stress in the plane of the crack. G is then again determined for Mode I and Mode II cracks by modelling each case separately. The analysis is finally validated by fulfilment of the conservation of energy release rate criterion, G (Mixed mode) = G (Mode I) + G (Mode II).
Performance Study of the Anti-Scatter Grid for Sub-Megavolt X-Ray Flash Radiography
Authors: Liu Wen Jie , Liu Jun , Xiao Zhi Qiang
Published: March 2013

In the field of the flash radiography scattering is one of the most important affecting factors in determining the object information. A state-of-the-art optical component called anti-scatter grid has been used in high energy X-ray radiography. But the application for such kind of module in sub-megavolt (100 keV ~ 1MeV) flash radiography has not been mentioned yet. Recently our group has designed a new grid which was different with the products either in high energy X-ray radiography or in low energy mammography. The grid was manufactured and then tested in a 450 keV flash radiography source. The experimental results indicated that the grid’s anti-scatter capability was superexcellent. The Monte Carlo simulation also confirmed the experimental conclusion and the scattered to primary ratios with and without the grid were evaluated quantificationally.
Low Strength Self Compacting Concrete Compressive Strength Test
Authors: Yan Feng , Pang Nan
Published: March 2013

In this paper,the mechanical properties were studied,the self compacting concrete cubic compression strength,prismatic compressive strength test,discussed two kinds of relationship between intensity index.
Experimental Study on Work Performance of Waste Rubber Concrete
Authors: Wang Xiao Chu , Yang Chun Feng , Yang Min
Published: March 2013

Though design different of strength of rubber concrete, particle size of rubber, content of rubber, pretreatment methods of rubber, mixing methods of rubber, to study the work performance of waste rubber concrete. The results show that: When doped fine rubber powder to replace the sand is greater than 10% or the outer dosage greater than 20 Kg/m3, the work performance of the concrete mixture is reduced sharply.
Pore Characteristics of Pavement Concrete with Nano-Particles
Authors: Zhang Mao Hua
Published: March 2013

Pore characteristics of pavement concrete with nano-particles (TiO2 or SiO2) are experimentally studied and compared with that of plain pavement concrete. The test results indicate that the addition of nano-particles improves the pore structure of concrete. The refined extent of pore structure of concretes increase with decreasing content of nano-particles. The pore structure of concrete with nano-TiO2 is better than that of concrete with the same content of nano-SiO2.
Experimental Study on Expansive Concrete Filled Steel Tube
Authors: Huo Kai Cheng , Shu Xian Cheng , Yue Huan Huan
Published: March 2013

Measure the temperature change of concrete-filled steel tubular with high strength low heat micro-expansive in its hardening process with different mix proportion. Study self-stress of high strength low-heat micro-expansive and study the relations of the expansive admixtures quantity and its changing regularity with the time. Observe the fail of axial compression short column of concrete-filled steel tubular with high strength expansive under vertical loading, study the changing regularity of its stress under loading.
Analysis of the Influence of Bar-Defects to Warping of PMMA Products
Authors: Huang Yao , Wu Da Ming , Zheng Xiu Ting , Liu Ying
Published: March 2013

Moldflow software is used to analyze the warping of the PMMA sheet in this article. It is shown that density of bar-defects, cross-section shape of bar-defects and sectional dimension of bar defects influence the warping in different level. The relationship of bar-defects and warping is amply analyzed. As a result, it is found that cross-section shape of bar-defects and sectional dimension of bar defects have more influence to warping, especially in the vertical direction of the surface. At last, some feasible method is put forward to decrease the warping.
Effect of Extrusion Size on Forming Process in Equal Channel Angular Pressing
Authors: Zhao Xiao Lian , Zhao Ning Ning , Chen Na
Published: March 2013

In order to meet the industrial demands for large-sized bulk ultrafine-grained materials, which were prepared by severe plastic deformation, the law curves of equivalent strain, equivalent stress and load of different-sized extrusions had been gotten by the finite element simulation of ECAP. The extrusion size has little effect on the values and distribution law of equivalent strain as well as the values of equivalent stress. With the increase of extrusion size, the distribution uniformity of equivalent stress decreases, and the extrusion load increases. Although the ECAP of the large-sized extrusions improve the requirements of mold and equipment, the chunk of evenly ultrafine-grained materials can be obtained by multiple passes.
Periodic Nano-Structure Formation with Femtosecond Laser Ablation and Patterning of Silicon
Authors: Xu Jian Ting , Yuan Dong Qing
Published: March 2013

Regular micro-apparatus which covered with periodic nano-hole, nano-ridge and ripple structures on silicon bulk were formed by laser micro-machining with tightly focused beam of the femtosecond laser with wavelength of 800 nm, repetition rate of 1 kHz and the pulse length of 130 fs in air. The periodic nano-hole structures which focus with a 20× focusing objective lens (NA = 0.4) is reported. Investigating the relationship between the width of structures and the speed of processing.
Experimental Study of the Influence on the Residual Fatigue Life of 45 # Steel Fatigue Damage Specimens
Authors: Wang Ping , Yang Rong , Tian Ji Feng
Published: March 2013

Abstract. In this paper, the fatigue life of the 45 # steel specimens is tested. Two groups of fatigue damage specimens are prepared for the experimental study. Their fatigue cycles respectively reached 80% and 90% of the fatigue life tested. The repairing experiments to the two groups’ specimens by the high voltage pulse discharge are finished. After these repairing experiments, the residual fatigue lives of the two group specimens repaired are tested. The results show that the residual fatigue lives of the specimens are improved greatly. The total fatigue lives of the specimens have been increased at least 160% of the fatigue life tested.
Combining Recovering Iron with Activating the Residual Slag Process for Electric Arc Furnace (EAF) Slag
Authors: Liu Zhi Wei , Li Yu , Cang Da Qiang , Chen Yi , Jiang Shuai , Wang Can
Published: March 2013

Electric arc furnace (EAF) slag is the byproduct of electric arc furnace in the process of metallurgy. In this paper, a recovering iron process combined with an activating residual slag process for EAF slag has been put forward. Researches show that increasing fineness of EAF slag is adverse to recover iron from the slag and 21.27% of the EAF slag could be separated as recovered iron concentrate with grade of 64.34%. The residual slag after magnetic separation process could be activated through mixing activating agent. Hemihydrates gypsum was the best activating agent to improve reactivity of the residual slag, which could meet the requirement of the first grade of steel slag powder in national standard. Then residual slag cements had been successfully prepared with 30% of activated residual slag and a 28-day compressive strength of 44.46MPa.
3D Coupled Thermo-Mechanical FE Analysis of Surface Defects in Continuously Casting Slab
Authors: Yang Sheng Nan , Jiang Zheng Yi , Wei Dong Bin
Published: March 2013

The behaviour of the surface defects on the continuous casting slab during hot rolling is investigated using the commercial FE-code LS-DYNA. The thermo-elastic-plastic material model is chosen in the simulation models, and the material implemented in the simulation is the austenitic stainless steel 304. The numerical results show the significant morphological changes of the surface defects during hot rolling and afford valuable indications for a deeper understanding of the underlying process. An accelerated crack growth and propagation are observed for the edge cracks, and the closure behaviour is found in the transverse and longitudinal cracks. The effect of temperature is significant on both the roll and the strip in hot rolling process. The developed models consider different types of mesh and element, thermal conditions, and rolling schedules. The predicted relationship between rolling conditions, the temperature distribution of crack, and the full history of temperature variation are discussed in this study.
Analysis for Force in a New Method of Lapping Brake Pump Master Cylinder
Authors: Yang Jian Dong , Li Yi Quan , Long Duo
Published: March 2013

By means of finite element method this paper analyzes a new support method used in lapping with solid abrasive and reearches lapping pressure distribution between workpiece machining surface and solid abrasive in lapping process with lapping tool pressed by three support points.From results we can find that by means of the new method the lapping pressure distribution between workpiece machining surface and solid abrasive is improved obviously in lapping process,which is favorable to increase cylindricity of machined hole.Through actual machining process, new method is demonstrated increasing cylindricity accuracy of machined holes of main cylinder significantly.
Analysis of Wire-Line Coring Hydro-Hammer Technologies in Xiaoqinling Gold Ore Deposit
Authors: Liu Zhi Guo , Cai Ji Hua , Yang Kuan Cai , Tian Min
Published: March 2013

After introducing SYZX75 wire-line coring hydro-hammer, we launched the study on its assorted drilling technology and field trial in Xiaoqinling gold ore deposit of Lingbao City of Henan Province. Field trial results showed that unit efficiency per month, average hour efficiency, roundtrip length and core recovery percentage in cracked formation could be improved obviously. We also could observe the decline of drilling cost and borehole deviation. It can be further popularized.
Study on Broken Wire Impact and Safety Degree Evaluation
Authors: Yang Lin Hui , Xiao Rong , Ji Xian Wu , Li Hong Nan , Sun Tong
Published: March 2013

Considering transmission tower-line system coupling vibration ,construct a three dimensional finite element nonlinear analysis model for 500KV Shanghai to Xuzhou transmission line project.Execute Dynamic response analysis of transmission tower-line system under broken wire impact with SAP2000.The results show that :broken wire influence on the reaction of transmission tower-line system displacement and internal force can not be ignored ;influence on the reaction of transmission tower-line system displacement and internal force caused by ground wire broken is less while that of conductor is significant,peak value of a stem internal force can be as much as 2 times initial axial force ;the more wires are broken,the vibration response of transmission tower-line system is greater, the safety degree is lower;when it comes to internal force,there is significant difference between consider broken wire load as impact load and as static load,dynamic effects cannot be ignored.
Biomechanical Study on the Influence of Shaping Amplitude on Material Strenght of Titanium Implant
Authors: Li Ya Lan , Guo Wei Peng , Jiang Wen Tao , Wang Qing Yuan , Fan Yu Bo
Published: March 2013

The effect of shaping amplitude on the residual material strength of titanium implants was studied. A purposely built to and fro three point bending apparatus was developed for different amplitudes on the implant material. The strength of the material after different levels of amplitude was investigated thorough uniaxial tensile testing. The effect of stress concentration due to amplitude was investigated by finite element analysis. It was concluded that plastic deformation due to shaping amplitude produced different effect on the residual strength of the material.
The Influence of Oxide-Salt Ratio on Crystallization of Lu2Ti2O7 Phase from Molten Salt
Authors: Zhang Shu Yu , Li Bao Rang , Liu Run Hao
Published: March 2013

Lu2Ti2O7 powders have been prepared using TiO2 and Lu2O3 oxides as precursors based on molten salt technique and the effects of salt-oxide ratio on the phase transformation is studied. A significant influence of salt-oxide ratio on phase transformation has been observed and the salt-oxide molar ratio of 3:1 is preferred for improved synthesis reaction efficiency. Such an experimental trend is analyzed with the assistant of JMA equation and the possible correlations between salt amount and the nucleation rate is given. After confirming linearly increasing of the crystal size with time, which is an indicative of interface controlled crystal growth kinetics, the investigations on the curves resulting from the logarithm of phase transformation fraction (ln[-ln(1-α)]) plots versus both the annealing time (lnt) and calcinations temperatures ( ) under isothermal and non-isothermal conditions respectively suggest that the enhanced crystallization is derived from the modification of salt amount to the nucleation rate.
The Research of the Green Buffer Packaging Materials for the Small Pieces of Express Items
Authors: Liu Ye , Wang Shi Hang
Published: March 2013

Focusing on the demand for green buffer material with increasingly rapid growth of Express packaging market and main discuss the technology of foamed bamboo fiber and pay more attention on producing them. Add 40g bamboo powder and bamboo pulp as the original reaction materials, and then contrast the foamed productions. The results show the bamboo pulp has a better buffer ability. Add different contents of photo starches and contrast the results of the experiments, and then it could conclude that 20g photo starches could bond the bamboo fibers and adhesives well. By selecting different kinds of foamed reagents and researching the suitable ratio of them, it could concludes that organic foamed adhesive AC should be 0.3g, and inorganic foamed adhesive should be (3gNaHCO3:2gNH3HCO3:1g(NH3)2CO3). By adding different contents of CaCO3, it could conclude that 4g is the best value. By contrasting the validity of microwaves oven and high temperature container, it could conclude that put the composites into the microwaves for 7 minutes will not only have a high quality, but also a short time. Finally cut the foamed bamboo fiber productions into small grains. Test the static buffer characteristics of the small grains, and then F-X, σ -ε、C-ε curves could be recorded.
First Principle Study of Hydrogen Storage
Authors: Zhang Bei , Zhang Jun , Chen Chu
Published: March 2013

The interactions between M and nH2O (M= Li+，Mg2+，Ca2+，and Al3+，n=1-8)had been investigated by using density-functional theory(DFT) calculation. We also discuss the interaction between ionic polymer-metal composite with different number of H2O and H2 (M:nH2O:2nH2). The results show that the hydrone could be greatly polarized, increasing the polarization of H2O and making the hydrogen storage properties become stronger. Our result is consistent with the experiment in that Mg2+ adsorbs three hydrones from the benzene ring which composes a stable structure, and the hydrogen storage capacity is up to 10 wt%.
Feasibility Analysis of Application of Low-Temperature Radiation Electric Heating System
Authors: Yang Jin Gang , Yang Li Kai
Published: March 2013

As a heating system of energy saving, environmental protection, comfortable, safe and new-type, low-temperature radiation ground electric heating system has many advantages that other heating ways can not be on a par with such as long service life and free from maintenance within 50 years and has been gradually accepted by broad developers and residents. It has been broadly applied in heat supply in residence, industrial workshop, classrooms and hospitals; warm preservation in pipeline and warming in high tunnel and snow melting in slope road. Take 16 classic users in certain community as research target in analysis of energy saving potentiality of low-temperature radiation electric heat supply.
Improved Plastic-Al Pipe Based System for Refrigeration of Energy Existed in Urban Sewage
Authors: Yang Jin Gang , Xiao Jia Fu
Published: March 2013

In order to recover the urban sewage energy ,a lab-scale equipment for the sewage energy recovery based on water source heat pump was developed and researched experimentally .The technique of indirect heat exchange by the plastic-Al pipe to recover the urban sewage energy, i.e., the corrosion of the heat exchanger, laying the foundation for the practical utilization of sewage energy. The experimental results show that the developed system is favorable to the environment protection and energy conservation, satisfying the cooling duty requirement with the average coefficient of performance 4.15 in the open cycle system and the average coefficient of performance 3.64 in the close cycle system.
Hardware-in-the-Loop Simulation Research on Driving System of Hybrid Electric Motorcycle
Authors: Xiao Ping , Tian Li , Gao Hong
Published: March 2013

Abstract. At present, many experts are dedicated to applying new control theory in driving system of hybrid electric motorcycles, but the verification of new control theory in real hybrid electric motorcycles faces many difficulties. Therefore, a hardware-in-the-loop simulation platform of hybrid electric motorcycle’s driving system was designed. At first, mathematic model and simulation model of driving motor were designed. Thereafter, the hardware-in-the-loop simulation platform was designed by taking dSPACE as the carrier of simulation model. In view of multiple values and high nonlinearity of driving system in hybrid electric motorcycles, Bang-Bang Fuzzy PID control algorithm was designed. Furthermore, simulation experiments with different control algorithms were carried out through the hardware-in-the-loop simulation platform designed in this paper. Simulation results indicated that the hardware-in-the-loop simulation platform could work effectively and the control effect of Bang-Bang Fuzzy PID control algorithm was good.
Modeling and Simulation Analysis of Certain Vehicular Gatling Gun
Authors: Li Tao , Wang Rui Lin , Sheng Long Bo
Published: March 2013

To study the influence of barrel’s deformation and vehicle velocity to certain vehicular Gatling gun, a virtual simulation with rigid-flexible coupling was established by using ADAMS/Flex module based on rigid multi-body dynamics and flexible body dynamics theories. Considering the interaction of the tires and road surface, vehicle and machine gun, the dynamic analysis and calculation of exterior ballistics were completed in various vehicle velocity condition, the muzzle response characteristics and impact position were obtained. The Model is testified rational, accuracy and effective by comparing simulating results with the experimental data of the velocity and displacement of barrel, which has laid the foundation for further simulation and structural optimization.
Digitalized Design of Upward-and-Downward Adjusting Mechanism of Automobile Seat
Authors: Xiao Ping , Tian Li , Gao Hong
Published: March 2013

Abstract. Worm-cam combined mechanism was chosen as the kinematic precept of upward-and-downward adjusting mechanism of automobile seat on the basis of functional requirements. The designing mathematical model of the combined mechanism was built on the basis of mechanism theories, and its programs were written in Matlab to solve the model. Parameterized models of every parts of the combined mechanism were built and their virtual assembly was carried out in CATIA. In ANASYS, which was based on assembly finite element analysis, the strength and rigidity of the combined mechanism assembly digital models was analyzed and evaluated. Finally, a design sample was presented.
Study on Quantum Key Distribution
Authors: Guo Xiao Qiang , Luo Cui Ling , Yan Yan
Published: March 2013

Quantum key distribution (QKD) uses quantum mechanics to guarantee secure communication. It enables two parties to produce a shared random secret key known only to them, which can then be used to encrypt and decrypt messages. QKD is a research hotspot of international academia in recent years. We introduce some protocols: BB84 protocol, E91 protocol, SARG04 protocol.
Four Band Cardinal Orthogonal Scaling Functions and Wavelets in Higher Dimensions
Authors: Zhang Xin Cheng
Published: March 2013

Sampling theorem plays an important role in the engineering such as signal processing, image processing, digital communications, and so on. In this paper, the symmetry property of cardinal orthogonal scaling function is discussed. Then, a 4-band cardinal orthogonal scaling function from the relation between the highpass filter coefficients and wavelet is provided. Thus, sampling theorem in the wavelet subspace is obtained.
An Improved FOCUSS Algorithm in the Presence of Noise
Authors: Chen Yu Qiang , Guo Jian Lan , Liu Yi Jun
Published: March 2013

FOCUSS(Focal Underdetennined System Solver) algorithm is a novel tool for sparse representation and underdetermined inverse problems. To improve the performance of FOCUSS in the presence of noise, we propose an improved FOCUSS algorithm using augmented Lagrange multiplier in this paper. The improved algorithm introduces precise penalty factor with limited value to enhance the precision of signal recovery. For dealing with large scale problem, Conjugate Gradient method is also cooperated to accelerate the convergence speed. Finally, computer simulations illustrate that performance on strengthening the recovery ability of the signal.
Research on an Automatic Measurement System in Wheelset Parameters
Authors: Xiao Jun , Qiu Jie , Yang Wan Fu , Fang Rong
Published: March 2013

This paper introduces a two-dimensional roller measurement mechanism according to the requirements of locomotive wheelset parameters measurement process. This mechanism makes it possible for single measurement head to measure the dimension parameters of a wheelset on axial and radial. It puts forward some methods on reducing parameters of wheelset systematic measurement errors after analyzing the structure of measurement mechanism. Automatic measurement system made by this two-dimensional roller measurement mechanism has high measurement efficiency and accuracy, strong anti-interference ability and operational reliability. The measurement system has been successfully applied in enterprise production.
Cast Shadow Removal in a Real-Time Environment
Authors: Zhang Hong Ying , Li Hong , Sun Yi Gang
Published: March 2013

The cast shadows on the background of the object will distinctly affect the recognition of the foreground objects. Due to the limitation of shadow removal methods utilizing texture, a novel algorithm based on Gaussian Mixture Model (GMM) and HSV color space is proposed. Firstly, moving regions are detected using GMM. Secondly, we make two pre-classifiers accurate and adaptive to the change of shadow by using the features of shadow in RGB and HSV color space. Experimental results show that the proposed method is efficient and robust.
Simulation and Analysis on Slope Cutting Reinforcement Scheme of Lishigou Tunnel
Authors: Xiong Wen Lin
Published: March 2013

In the construction and excavation process of highway project in mountain area, because the value degree of the geological environment conditions and geological disasters is insufficient, so it often causes the landslide resurrection or part of the resurrection, and forms a new landslide disaster. To ensure the tunnel portal construction and the stability of the slope, this paper based on LiShigou tunnel portal slope engineering, in view of the different slope unloading plan of the LiShigou tunnel portal slope, and based on FLAC3D software to take numerical simulation analysis and comparison, then to determine the safety and the reliability of the construction,at last the optimum scheme of the unloading is choosen.
Master-Slave Global Synchronization for Froude Pendulums via Linear State Error Feedback Control
Authors: Xu Lin , Liu Zhong , Chen Yun
Published: March 2013

This paper deals with the global chaos synchronization of master-slave Froude pendulums coupled by linear state error feedback control. A master-slave synchronization scheme of the Froude pendulums under linear feedback control is presented. Based on this scheme, some sufficient criteria for global synchronization are proved and optimized. A numerical example is provided to demonstrate the effectiveness of the criteria obtained.