bluuebunny/crossref_metadata_2025 huggingface dataset:
Stochastic Stability and Bifurcations of the Singe-Degree-of Freedom System with Two Delays
Authors: Qin Xue Wen
Published: March 2013

In this paper, we analyze a singe-degree-of freedom stochastic dynamical system with two time delays. Applying Hale’s reduction approach and stochastic center manifold, the direction of the Hopf bifurcations and the stability of the bifurcating periodic solutions are determined.
Research on Operation Mode of Intelligent Logistics Base on Fourth Party Logistics Platform
Authors: Jiang Yu , Wang Kai Ming
Published: March 2013

As intelligent logistics operation complexity it need to described from multi angle and levels, by using of multi-view modeling approach, it can avoid information loss problem caused by single view, thus give a complete description of intelligent logistics operation mode. This paper combines the features of intelligent logistics and fourth party logistics platform, from the five views including organization view, function view, resources view, processes view and information view, gives a set of multi-view modeling references suitable for intelligent logistics operation, and puts forward the operation mode of intelligent logistics based on the fourth party logistics platform.
A Lifting Wavelet Structure Based on Lateral Inhibition Characteristics
Authors: Xue Hong Ye , Zhang Yan
Published: March 2013

Aiming at the question of infrared image edge to enhance and the real-time processing, this paper researches a Bubble wavelet construction process which can remove redundant information, strengthen the difference of information and have the lateral inhibition characteristics ,derives the Bubble wavelet lifting scheme and the lifting coefficient , and finally with the application of the lifting scheme, we realize the parallel computing aiming at the infrared image decomposition and reconstruction, the results show that based on lateral inhibition characteristics of the Bubble wavelet lifting scheme is correct, and also proves the usability of the lifting coefficient.
DWT and Signal Energy Based Zero-Watermarking Algorithm for Text Image
Authors: Lin Qi Wei
Published: March 2013

A zero-watermarking algorithm for text image that based on DWT and the signal energy was proposed. We first change the text file into the corresponding binary image, then apply triple-wavelet transform on the binary image, and combine relations of the signal energy to construct zero-watermark. At the watermark detection step we use the similarity to judge the copyright Information. The attack experiments shown that the proposed algorithm were robust to a variety of attacks, and had a good Invisibility. The watermark algorithm obtained a better solution to the embedding capacity and the Invisibility, for the zero-watermark algorithm does not need to modify the carrier data. So it can meet the requirements of practical application.
A Novel Particle Swarm Optimization with Random Parameters
Authors: Huang Shao Rong
Published: March 2013

To improve the performance of standard particle swarm optimization algorithm that is easily trapped in local optimum, based on analyzing and comparing with all kinds of algorithm parameter settings strategy, this paper proposed a novel particle swarm optimization algorithm which the inertia weight (ω) and acceleration coefficients (c1 and c2) are generated as random numbers within a certain range in each iteration process. The experimental results show that the new method is valid with a high precision and a fast convergence rate.
Application Study of 3D Display Technology in EDA Experiment
Authors: Xiong Fei Qiao
Published: March 2013

Experiment is an important part in the teaching process of electronic technology course, and EDA virtual experiment provides an interactive, active participatory and responsive learning environment for the students by creating a virtual environment. This learning environment can help students to grasp the theoretic knowledge from classroom learning faster and better, deepen the understanding of basic concepts and principles and be familiar with the use of commonly used electronic instruments, which would promote the cultivation of students' quality. Moreover, in the environment of 3D display, students can observe three-dimensional objects from different perspectives and won't be confused with the excessive crosses of conductor design, so as to strengthen their feelings on the actual electronic devices.
Robust Controller Design for Inverted Pendulum System
Authors: Cao Xu , Li Nian Feng , Zhang Hua Xun
Published: March 2013

For the high order, unstable, multivariable, nonlinear and strong coupling characteristics, robust stability is an important indicator of inverted pendulum system. In this paper an LQR robust controller of inverter pendulum system is designed. The simulation and the experimental results showed that the stability of the robust LQR controller is better than the original LQR controller. When the system departure counterpoise for all kinds of reasons, it get back equilibrium state without depleting any energy, and approach state of equilibrium of all state component.
The Application of Computer Software — 3D Studio Max, Lightscape and V-Ray in the Environmental Artistic Expression
Authors: Hu Jia Ying
Published: March 2013

Since the birth of mankind, thousands of tools have been invented where computer is the greatest one. All inventions are the expansion and extension of various organs of the human, so the invention of the computer is the expansion and extension of the human’s brain. It enables the human to be smarter and more intelligent, so it is the superlative intelligence tool. Nowadays, we have stepped into the computer age, and the impact and influence of the computer technology on the arts and art design has emerged and seems to be overwhelming.
A New Method for BCH Codes of Blind Recognition
Authors: Wang Lan Xun , Li Dan Fang
Published: March 2013

According to the invariance property of the BCH code and Euclidean algorithm to calculate the greatest common factor (GCF) between code group and its cyclic shift code group. There is a method by using the degree distribution probability sum function of the greatest common factor to recognize the code length of BCH code. On this basis, the GCF can be extracted of the greatest degree distribution probability from the sum function, with the generator polynomial obtained by decomposing the GCF. The simulation results show that this method can achieve the recognition probability above 95% with BER of 4×10-3，and the high BER is much better to recognize the short codes.
A Secure Strategy for Location-Based Wireless Sensor Networks
Authors: Zhang Yu Quan , Wang Yan
Published: March 2013

A Secure Strategy for Location-Based Wireless Sensor N A cluster-based secure strategy for wireless sensor networks is proposed. The two-dimension sensing area comprises a number of clusters, each of which contains four small squares called cells. The WSNs structure is a two-layer structure. The upper layer consists of all cluster heads and the lower layer consists of all ordinary sensors managed by their cluster heads. The cluster heads establish their pairwise keys through utilizing a key pre-distribution scheme based on cluster head identifications and the ordinary sensors establish their pairwise keys through employing a dynamic key management strategy based on exclusion-based systems (EBSs). Analysis and comparison show this scheme enhances the WSNs security, decreases WSNs communication consumption, saves cluster head and sensor energy expenditure, and prolongs the lifetime of both cluster heads and ordinary sensors.etworks
Study of the Technology to Design the Role Model Based on the Outline
Authors: Zhao Hui Ying , Zhu Qian Kun , Liu Zhi Yong , Wang Yang , Li Ting Jun
Published: March 2013

The outline is one of the easiest and immediate methods to expresses people’s image of object, records and acquires the inspiration and the design that will be lost during a wink. The 3D modeling based on the outline adopts the computers’ strong power of technologies to sculpt. It demands not only grasping the NURBS and the polygon modeling technology, but also the sound sculpting base and good understanding of the space structure. To the 3D modeling method based on the irregular outline, this paper analyzes an a-ka role model, come up with the modeling method of 3D geometry reference, and make the a-ka model with this method. At last the model through the fit designing program is finished.
Preparation and Property of a Composite of PPy/MMT/PMMA
Authors: Cai Ji Wei , Niu Hai Jun , Bai Xu Duo
Published: March 2013

Polypyrrole/montmorillonite (PPy/MMT) particles were synthesized using an oxidative polymerization method. Then the particles were added into polymethyl methacrylate (PMMA) as additives to prepare PPy/MMT/PMMA composite. The structures and properties of the composite were characterized by FT-IR, TGA, X-ray diffraction spectroscopy, and four–probe machine. The relationship between content of PPy/MMT and conductivity was analyzed. The result shows that the amount of PPy/MMT is a key factor for improving the conductivity of composite. Furthermore, dynamic mechanical (DM) properties of composite were studied. When the PPy/MMT content reach 0.2% of composite, the storage modulus, loss function modulus, dissipation factor get highest values.
Label-Free Aptamer Fluorescence Determination of Trace Pb2+ Using AuPd Nanoalloy Probe as Catalyst
Authors: Jiang Zhi Liang , Tang Mei Ling , Liu Qing Ye , Liang Ai Hui
Published: March 2013

In the condition of 1.24 mmol/L EDTANa2, 16.7 mmol/L NaCl and 0.17 mmol/L Tris, the substrate chain of double-stranded DNA (dsDNA) could be cracked by Pb2+ to release single-stranded DNA (ssDNA) that adsorb onto AuPd nanoparticle (AuPdNP) and form stable AuPdNP-ssDNA, but the dsDNA can not protect AuPdNP that were aggregated to big AuPdNP aggregations (AuPdNPA) under the action of NaCl. The AuPdNP-ssDNA and AuPdNPA could be separated by centrifugation. With the concentration of Pb2+ increased, the released ssDNA increased, the AuPdNP-ssDNA in centrifugation solution increased and the catalytic effect enhanced on the fluorescence quenching reaction of Rhodamine 6G (Rh6G) and NaH2PO2, which led the fluorescence intensity at 552nm to decrease. The decreased fluorescence intensity (ΔF552nm) was linear to the concentration of Pb2+ in the range of 0.33-8.00 nmol/L, a detection limit of 0.21 nmol/L. The proposed method was applied to detect Pb2+ in water samples, with satisfactory results.
Theoretical Modification on Optic Properties for Transmission-Mode GaAs Photocathode Module
Authors: Xiong Ya Juan , Zhao Jing , Chang Ben Kang
Published: March 2013

To explore the optic properties of transmission-mode GaAs photocathode module, experimental and theoretical values of reflectance and transmittance of photocathode module has been compared. it showns that experemental curves cannot tally with theoretical curves completely. The variation range of initial values of thickness is firstly setted. Modifing transmittance formula by a fitting coefficient A, optical properties is fitted using the method of error control. R-T combined error reduced from 15.2% to 4.9% using R-T combined error control scheme. Optimal fitting values of thickness of photocathode module are obtained, which are d1= 110 nm, d2= 1019 nm, d3= 1491 nm. And the error of total thickness is 2.9%.
An Immune AuRu Nanoalloy Probe for Trace CA125 Using Resonance Rayleigh Scattering as Detection Technique
Authors: Jiang Zhi Liang , Tang Mei Ling , Liang Ai Hui
Published: March 2013

The AuRu nanoalloy (GR) which Au/Ru molar ratio of 32:1 was prepared by the sodium borohydride reduction method. In the condition of pH 6.0, the GR was used to label CA125 antibody (Ab) to obtain an immunonanoprobe for CA125 (GRAb). In pH 7.0 citric acid-Na2HPO4 buffer solution, GRAb was aggregated nonspecifically to big clusters, which showed a strong resonance Rayleigh scattering (RRS) peak at 278nm. When CA125 was added, GRAb reacted specifically with CA125 and GR dispersive in the solution, which led to the RRS intensity decreased greatly. The decreased RRS intensity was linear to the concentration of CA125 in the range of 1.3-80 U/mL, a detection limit of 0.81 U/mL. The proposed method was applied to detect CA125, with satisfactory results.
Effect of CeO2 on the Microstructure and Properties of Thermal Spray Welded FeNi Coatings
Authors: Liang Bu Nv , Zhang Zhen Yu , Zhang Peng Lin
Published: March 2013

FeNi self-fluxing alloy powders and CeO2 were flame spray welded onto carbon steel, bonding strength investigations of the coating/substrate systems were conducted. The microstructure of the coatings was analysed by a field emission gun scanning electron microscope(FEGSEM), with attached energy dispersive spectroscopy(EDS). The result showed that with the addition of CeO2, the microstructure of the coatings are refined compared with that without CeO2. The mechanism of the microstructural refinement by the addition of CeO2 is dicussed in this paper.
Preparation of High Weight Loading Lithium Borohydride in Carbon Aerogels
Authors: Yan Xia Yan , Li You , Du Jie , Luo Xiao Na , Qin Cheng
Published: March 2013

We describe approaches using modified carbon aerogels for increasing the weight loading of LiBH4. Large pore volume carbon aerogels were prepared with a sol-gel method and a polymethyl methacrylate (PMMA) microsphere template. Compared to those without using templates, the pore volume has been up to 3.8 times with a PMMA template. After incorporation into carbon aerogels, the weight loading of LiBH4 has reached 80%. Nitrogen absorption/desorption measurements show that more than 95% free space of carbon aerogels has been incorporated with LiBH4. Rama spectra suggest that there is no PMMA or chemical reaction during the synthesis of LiBH4/carbon aerogel composites.
Living Radical Polymerizations of Methyl Methacrylate Mediated by Tris-(4-Carboxyphenyl) Methane
Authors: Xu Yuan Qing , Fang Xiao Min , Ding Tao , Ren Yan Rong
Published: March 2013

Pseudo-living radical polymerization and reverse atom transfer radical polymerization (RATRP) of methyl methacrylate (MMA) were reported, utilizing tris-(4-carboxyphenyl)methane (TCOPM) as the thermal iniferter and initiator, respectively. The polymerization of MMA using TCOPM as thermal iniferter possesses pseudo-living characteristics: Mn increases with conversion in a certain range, and the resulted polymer can be used as the macro-initiator for chain extension. The RATRP using TCOPM as the initiator shows linear kinetic plot, linear increase of Mn with conversion and narrow polydispersity indice (PDI) of the resultant polymers. Effects of temperature on both polymerizations were investigated.
A Research of the Polyurethane Foams Modified by Polyisobutylene
Authors: Huang Hong Jun , Wang Kang , Wang Jian Jiang , Wan Guo Shun , Jiang Lei
Published: March 2013

A series of spongy foams based on polyurethane (PU) modified by polyisobutylene (PIB) were prepared. The spongy foams with different PIB content were investigated. The results showed that initial adhesion increased with the increment of PIB content, and gained the highest value when the content reached to 30%; FTIR suggested the formation of PU foam modified by PIB; the density also increased with the increasing content of PIB.
An Experimental Observation of Calcium Alginate Medical Film Prevents Bone Cement Leakage in PVP
Authors: Zhang Jian Xin , Lin Yu Yang , Zhou Yi Qiang
Published: March 2013

Using calcium alginate medical film to explore the preventive measures of bone cement leakage in PVP.60 fresh vertebral bones were dissected from pigs(10 months old with average weight 152.5±7.5kg), and randomly divided into the blank group, the control group and the experimental group, 20 vertebral bones for a group. Eliminated the extra muscles and ligaments and the upper and lower endplates were completely retained. The models of vertebral compression fractures with fissures in front of vertebra were prepared by drilling two holes with a 3.2mm electric drill from lateral of the junction of the halfway point of parapophysis and the vertical of superior articular process to anterior vertebra along the direction of pedicles of vertebral archs by angle 10 and 15 degree and downward sloping 5 degree with the sagittal planes. Only bone cement was injected to the blank group, while the control group were injected with bone cement after injected medical fibrin glue. And the experimental group were injected with bone cement after injected sodium alginate glue and solidified by saturated calcium chloride. The injection dose of bone cement was recorded when bone cement leaked. The injection dose of bone cement in experimental group was significantly higher than the blank group and the control group when bone cement leaked (P<0.01).Calcium alginate medical film can effectively prevent the leakage of bone cement in PVP.
Plane Waveguide in 3-Layers Symmetric Metal-LHM-Metal
Authors: Lu Qiang Hua , Gao Ying Jun , Xu Jiang Yong
Published: March 2013

Propagation properties of TE mode for the symmetric waveguide made of left-handed material surrounded by metal substrate- and coat- layers are studied. The guidance conditions of TE mode is deduced by transmission matrix. Using graphical method, different propagation modes and corresponding transverse profiles of electric field are analyzed. It is found that the fundamental mode TE0 does not exists, such waveguide can support surface wave modes. There is a significant effect on transverse profile of order m and so on. This result will play a theoretical guidance for the research of waveguide containing left-handed materials.
Photocatalytic Activity of Sm, Zr Co-Doped TiO2 Synthesized by Ultrasonic Assisted Sol-Gel Method
Authors: Luo Xi Ming , Li Fen Fen , Gao Hong Tao
Published: March 2013

Sm, Zr doped nanocrystalline TiO2 powers were prepared successfully by a facile ultrasonic assisted sol-gel method. The products were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. X-ray diffraction peaks could be assigned to anatase TiO2, which confirms the crystallinity of the as-prepared samples. The SEM images demonstrated that the crystalinity is formed with spherical aggregates with average diameters ranging from 10 to 20 nm. The photocatalytic activity was studied on the photocatalytic degradation of methyl orange (MO) aqueous solution irradiated with UV-visible light. Under UV-visible light irradiation, the photocatalytic performances of the doped samples were much better than that of pure TiO2, and the co-dopant showed highest. It demonstrated that a strong Sm-Zr synergistic interaction might play a decisive role in driving the excellent photocatalytic performance of TiO2.
Study on Cavitation Erosion Behavior of Monel Alloys in the Simulated Seawater Solution
Authors: Zhang Chun Hua , Yan Ning , Hao Yu Xi , Wang Chao , Bian Xu , Zhang Song
Published: March 2013

Cavitation erosion test of Monel-400 and MonelK-500 alloys was carried out in 3.5% NaCl solution using an ultrasonic induced cavitation facility. The microstructure, composition and mechanism of cavitation erosion were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and induction balance, respectively. The results showed that Monel-400 alloy was single austenitic phase while MonelK-500 alloy contained Ni3Al intermetallics and its improvement in cavitation erosion resistance could be attributed to the higher hardness and density of the grain and twinning boundaries. In a series of 5h cavitation tests, the cumulative mass loss of Monel-400 alloy was 44.5 mg, which was 1.66 times than that of MonelK-500(26.8mg). No apparent incubation period was observed and the damage mechanism was plastic deformation and rupture.
Determination of 2A16 Constitutive Model
Authors: Deng Jiang Hua , Tang Chao , Zhan Yan Ran , Jiang Xing Ying
Published: March 2013

The stress-strain curves of 2A16 under different strain rate range (10-3s-1-103s-1) and different temperature range (293K-673K) were obtained through the quasi-static compression test and SHPB test by experimental method. The parameters were determined based on Johnson-Cook model and the strain rate hardening term in them was modified. The results show that 2A16 is a kind of strain rate and sensitive temperature materials. The flow stress increases with strain rate increasing, while that decreases with temperature increasing. The deviation is large between the unamended Johnson-Cook constitutive model and test data, while the modified constitutive model is a good agreement with experimental results. And the study is a preparation for the numerical simulation of 2A16 rivet electromagnetic riveting.
Effect of Heat Treatment to Twin-Wire Arc Spraying Ni-5wt.%Al Coating on 6061-T6 Aluminum Alloy Diffusion
Authors: Wang J.X. , Sun J.F. , Wang Z.P.
Published: March 2013

In this study, Ni-5wt.%Al coating was fabricated on the 6061-T6 aluminum alloy substrate by twin-wire arc spraying technology. Through different heat treatment process, effect of microstructure and phase structure was studied with different temperature and time. Interface reaction mechanism of alloy coating/substrate and diffusion behavior of elements was discussed. Heat treatment was carried out at 400°C，480°C，550°C and respective for 4h, 24h, 48h. The XRD , SEM and EDS results showed that main phases of Ni-5wt.%Al original coating were composed of Ni solid solution, in addition to a small amount of Al2O3, NiO and Al4Ni3. Phase composition has basically not changed, interface of the coating/substrate occurred diffusion, which was controlled by the diffusion of Al atoms. Intermetallic compounds of NiAl3 and Ni2Al3 were formed in interface of coating/substrate, and interface diffusion area gradually was thickened.
Synthesis and Characterization of α-Phase Silicon Nitride Powders by Direct Nitridation
Authors: Liu Jiu Ming , Wang Jian Lei , Ren Shu Xia
Published: March 2013

Using silicon powders as raw materials, adding nano-silicon nitride as a diluent and NH4Cl3 and FeCl3 as catalysts, α-phase silicon nitride powders were prepared by direct nitridation method. The silicon powders were first milled with 20% α-Si3N4 and 4% NH4Cl3 for 30 minutes. Then the mixture was heat-treated at 1300°C for 1 hour in the pure nitrogen gas. The phases and their content of the as-prepared product were detected by X-ray diffraction (XRD) and the microstructure was studied by scanning electron microscope (SEM). The results showed that the product mainly consisted ofα-Si3N4 with a mass fraction over 92% and were submicron-sized particles．
Effects of Environmental Humidity on the Tribological Properties of Modified PTFE Three-Layer Composites
Authors: Xie Ting , Yang Ting Ting , Yang Wen Juan , Tian Ming
Published: March 2013

In this paper, the tribological properties of the modified PTFE three-layer composites in different humidities were studied. The wear mechanisms of the modified PTFE three-layer composites with and without PI were also analyzed. The test results showed that in the humidity of 15%-75%, the friction coefficients of the composites increased with the humidity increased. At the humidity of 100%, the friction coefficient reduced significantly. With the increase of humidity, the wear of the composites decreased at first and then increased. The smallest wear appeared when the humidity was 45% or 60% for with or without PI composites respectively. And the results also revealed that PI is helpful to improve the wear stability of the composites in different humidities.
The Synthesis and SEM Characterization of Spherical LiMnPO4/C Composite Prepared by Spray Drying
Authors: Zhang Yan Jie , Wang Xue Yong , Gao Yang
Published: March 2013

Spherical LiMnPO4/C composite micro-particles with different carbon content were prepared by spray drying followed by heat treatment in the range of spray drying temperature from 220°C to 270°C. The structure, morphology and electrochemical performance of the resulting spherical LiMnPO4/C microparticles were characterized by X-ray diffraction, SEM and standard electrochemical techniques. Caron coated LiMnPO4 could be prepared from the as-prepared powders followed by heat treatment at 600°C for 12h in a Ar+10%H2 atmosphere. The sample was identified as olivine structure of LiMnPO4 without any impurity and spherical powders with approximately 3-5μm in primary particles size. Sample which was synthesized at 220°C SD temperature,10% carbon content showed the best electrochemical performance due to its small and homogeneous particle size diffusion, uniform carbon coating.
Effect of Raw Rubber on CH4 Formation from NBR Applied in Transformer Oil
Authors: Hu Fang , Tang Li Wen , Zhang Song , Zhang Chun Hua , Chen Dong Feng , Miao Yu Hua
Published: March 2013

The formation of CH4 from two kinds of NBR with different raw rubber applied in transformer oil were investigated. In this study, work environment of transformer was simulated，thermal aging tests were conducted for different times in 70°C transformer oil. Surface morphology, the release of CH4, and molecular structure were analyzed by using Gas Chromatography (GC), Scanning Electron Microscope (SEM), and Fourier Transform Infrared analysis (FTIR), respectively. In addition, the swelling property was also discussed in this work. The results illustrated that raw rubber with more content of acrylonitrile had excellent advantages in heat oil aging resistance and the formation of CH4.
Study on the Fabrication of Carbon Nanotube - Mesocarbon Microbead Composites
Authors: Wang Zhi
Published: March 2013

Carbon nanotube-Mesocarbon microbead composites were synthesized from coal tar pitch with carbon nanotubes (CNTs) as additive. The effect of CNTs addition and process parameters on the growth and morphologies of Mesocarbon microbeads (MCMBs) was investigated. The results show that adding CNTs enhances the nucleation and inhibits the growth and coalescence of MCMBs. Under the same thermal condensation conditions, the MCMBs made in the presence of CNTs tend to have smaller size, lower yield and more uniform size distribution, but more CNTs can lead to poor spherical degrees. Compared with the raw CNTs, the CNTs treated with blended acid can achieve better sphere and more uniform MCMBs with increasing CNTs ratio.
Effects of Hydrothermal Crystallization on the Morphologies and Photocatalytic Activity of TiO2 Nanotubes
Authors: Liu Su Qin , Liang Ying
Published: March 2013

Anatase titania (TiO2) films with highly photocatalytic activity were prepared by hydrothermal treatment of amorphous TiO2 nanotubes (NTs) via electrochemical anodization of titanium (Ti) in fluorine-containing electrolyte. The as-prepared TiO2 films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM). The photocatalytic activity of the as-prepared TiO2 films was evaluated by the photocatalytic degradation of methyl orange (MO) aqueous under UV-light irradiation. The effects of hydrothermal temperature and time on the morphologies, microstructure and photocatalytic activity of TiO2 films were investigated and discussed. It was found that TiO2 NTs were converted to nanoparticles after hydrothermal treatment. The mechanism of deformation of TiO2 NTs was discussed. Hydrothermal treatment enhances the phase transformation of TiO2 films from amorphous to anatase and crystallization of anatase. An optimal hydrothermal condition (150 oC for 8 h) was determined. The anatase TiO2 films prepared under optimal hydrothermal conditions posses larger surface area and higher relative anatase crystallinity and its photocatalytic activity is higher than that of anatase TiO2 films prepared under other hydrothermal conditions.
Mechanical Property Analysis and Numerical Simulation of Honeycomb Sandwich Structure’s Core
Authors: Li Xiang , You Min
Published: March 2013

Owing to the lack of a good theory method to obtain the accurate equivalent elastic constants of hexagon honeycomb sandwich structure’s core, the paper analyzed mechanics performance of honeycomb sandwich structure’s core and deduced equivalent elastic constants of hexagon honeycomb sandwich structure’s core considering the wall plate expansion deformation’s effect of hexagonal cell. And also a typical satellite sandwich structure was chose as an application to analyze. The commercial finite element program ANSYS was employed to evaluate the mechanics property of hexagon honeycomb core. Numerical simulation analysis and theoretical calculation results show the formulas of equivalent elastic constants is correct and also research results of the paper provide theory basis for satellite cellular sandwich structure optimization design.
Effect of Application of Probiotics Based on Mixed Effects Models
Authors: Xu Ya Ling , Sui Wei Wei , Qiao Jun Jian
Published: March 2013

In order to explore the effect of application of J-4 micro ecological preparation, based on the data from the experiment in the farm of Yixian County, Hebei Province, the research group established a linear mixed effects model , with time as independent variables, age and different formulations as the fixed effects, using spss software for analysis and solving, the results indicate that the model has the extremely good fitting and forecasting effect and method1 is the optimal ratio. The results will shed light on the further study of the role of probiotics .
Study on Properties Comparison of AH36 Opened Plate and Original Plate
Authors: Li Jun Suo , Dong Zhong Qi , Han Ti Wen , Yuan Jian Lu
Published: March 2013

It was compared AH36 opened plate using new techology with original plates using conventional method in the mechanical properties. Results showed: the mechanical properties of AH36 opened plate and plates of original plate are the same at the classification plate. The transverse tensile stength and yield strength of AH36 opened plate have an advantage over it’s longitudinal. The transverse elongation of AH36 opened plate and original plates are below the longitudinal. It is different the mechanical properties that is made of the deformation variance of AH36 opened plate and original plates in the transverse and the longitudinal.
The Effect of Nano-Silica on Rheological Behavior and Toughness of Modified Polypropylene
Authors: Li Dong Li , Xu Wen Cai , Fu Ya Bo , Shang Wei
Published: March 2013

In this article a kindof nanometer silicon dioxide material which prepared by co-precipitation method was used to improve the properties of ordinary raw material of polypropylene packing film. The results show that the nanometer silicon dioxide material not only greatly increased the notched izod impact strength of modified PP but also increased its flexural modulus and flexural strength and when the content of nanometer silicon dioxide material is less than 1%, the HDT of the modified PP is also lightly increased, and the same time other mechanical properties like tensile stress stay as before. Non-isothermal crystallization behavior of modified PP by this nanometer silicon dioxide material was investigated by differential scanning calorimeter. According to the study on the melt rheology,at a low shear rate, apparent viscosities of PP modified by the nanometer silicon dioxide material were lower than that of pure PP, which proves the nano-silicon dioxide materials can improve the processability of PP and will be good for the producing of PP packaging film. SEM and XPS method has carried on the attribute to the size of SiO2 and its distribution.
A Modified Polypropylene Resin for Food Packaging
Authors: Xu Wen Cai , Li Dong Li , Fu Ya Bo , Shang Wei
Published: March 2013

The slip agents used to reduce coefficient of friction of polypropylene(PP) film, but it migrate brought the issue of food safety, to reduce of the corona effect and the peel strength of flexible film. We try another method to reduce the coefficient of friction. The result shown that the nano-modification not only reduces the coefficient of friction of PP, but also reduces the adsorption of volatile organic solvent in PP. The coefficient of friction of modified polypropylene was reduced by 50% when the concentration of nano-silica is between 1~2%. The final residues toluene in modified polypropylene was reduced to zero when the concentration of nano-silica in PP is between 1~3%. The modified polypropylene agrees quite well with food safety.
Effect of Properties of Polyimide Fiber Paper-Based Materials by Different Paper-Making Process
Authors: Lu Zhao Qing , Xu Qiang , Wang Zhi Jie , Wu Zhen
Published: March 2013

Polyimide fibers and polyamide acid fibers was used as main materials to produce Polyimide fiber paper. A certain amount of PEO and aramid pulp was added and the sheet was treated by immersion and hot pressing in specified process. The experimental results showed that when the dosage of PEO and aramid pulp were 0.06% and 6% respectively, the sheet tended to present more excellent strength properties and electrical performance compared with sheet using single polyimide fibers as the main fiber materials.
Alien Solid Wood Furniture Parts Processing Technology and Optimization
Authors: Chen Xin Yi , Liu Wen Jin
Published: March 2013

It’s not easy to control the processing route of alien solid wooden furniture’s process, which is based on the CNC processing center. And the edition of the cutting tool path is complex. This paper puts forward the optimization design method of section layout, and determines the method of the cutting tool path through choosing proper cutting tool and adjusting the parameters. This paper also verifies the effectiveness of this method, taking a head of Europe type bed processing line as an example.
The Effects of Thermomechanical Processing on the Microstructure and Mechanical Properties of Ultra-High Strength Dual Phase Steel
Authors: Li Zhuang , Wu Di , Lv Wei , Kang Shao Pu , Zheng Zhen
Published: March 2013

In this paper, ultra-high strength dual phase steel was investigated. Thermomechanical processing was conducted by using a laboratory hot rolling mill. The results have shown that the main transformation products at three different kinds of thermomechanical processing were ferrite, bainite, and small amounts of martensite. Laminar cooling led to ferrite grain refinement. The mechanical properties of specimen 1 which was controlled cooling after a relative lower temperature rolling are much higher than that of specimen 2. The presence of martensite islands and precipitates contributed to the enhancement of strength of the present steel. And the presence of retained austenite resulted in higher toughness. As a result, these specimens exhibited satisfactory mechanical properties.
Design and Qualification of a Advanced Hybrid Filament-Wound Composite Pressure Vessel for Aircraft Application
Authors: Liu Zhi Dong , Yu Bin , Jin Qing Chen , Chen Wei
Published: March 2013

This paper describes a composite pressure vessel(COPV) development program which have been finished by Lanzhou Institute of Physics (LIP). In order to dramatically improve reliability and safety of COPV applied in military aircraft, this COPV(L376-COPV) design relies partly on the heritage of mature technologies and was developed in combination with existing and new technologies, Unlike traditional COPV, the impact resistant capability from high energy bullet of L376-COPV is improved greatly by liner material heart treatment and T800/K49 fiber hybrids over-wrap. L376-COPV design, analysis, manufacturing, testing and results was introduced.
Recycling Equipment with Filtering and Washing on Fine Powder of Rare Metal and Technological Design
Authors: Chen Chong Jiong , Chen Xu Xu , Song Zhi Ji
Published: March 2013

In order to meet the needs of recovery production of filtering and washing of fine powder of rare metal, a device has been developed which is a set ultra-fine filter, mixing washing, dry-pressed cake, cake discharge and microporous regeneration, etc. in one integral device, and all steps can be completed once using it in a confined space. In addition, a number of key technologies were advanced that can be realized by the device, including recycling technologies, polymer ultra-fine filter technology, equipment and structural design, workflow design, etc. The device has many advantages, such as high filtration precision, high recovery rate, high efficiency production, simple operation, high degree of automation and less environmental pollution. Fine powder of rare metal is generally prepared by electrochemical or chemical production method, wherein filtering and washing are two important processes. Filtering, washing, recovery technology and equipment progressiveness have a direct impact on products quality, resources loss, energy consumption, costs, environment and other problems. Design of a new ultra-precision filtering and washing equipment of fine powder of rare metal and its advanced recycling technology are of great significance.
Research on Simulation of Cutting Process Based on the Finite Element Analysis Method
Authors: Shen Yi Li
Published: March 2013

With the rapid penetration of information technology in various fields, CAD/CAM/CAE technology has been widely used to fundamentally change the traditional design, production, organizational models, it also has a very important significance to promote the technological transformation of existing enterprises, bring the whole structural change of the night, develop the new technologies and the promotion of economic growth. The paper uses the blades of steam turbine as an example, combined with the finite element analysis method to study the whole cutting process, the whole process was simulated and the results of error were had analysis and optimization.
In the Tundish Flow State in the ANSYS Simulation
Authors: Huang Tian Biao
Published: March 2013

Through the establishment of ANSYS tundish steel liquid flow finite element model analysis of finite element method in simulating the flow field in tundish for applications. comparison with and without flow control device of liquid steel in tundish flow characteristics the results have guiding significance for practical production.
Influence of Technology on Deformation Behavior of Cold-Formed High Frequency Induction Welded Steel Pipes
Authors: Hu Sheng De , Pi Da Guang , Li Li Xin
Published: March 2013

Tests were performed on mechanical property and microstructure of joints on cold-formed high frequency induction welded (HFIW) pipes. The welding surface energy (WSE) is proposed to evaluate the combined effect of technological parameters including the welding speed, input power and wall-thickness. The optimum production technology was obtained. The Widmanstätten microstructure and coarse grains were observed in the overheated zone. The width of the heat-affected zone (HAZ) is proportional to the WSE. With increase of the WSE, the reversed V-shape was formed by the mean bend angle. The optimum WSE decreases with decreasing the opening angle. Rather than the standard tensile test, the cold-bending test is suitable for evaluating effect of technology on quality of joints on cold-formed HFIW pipe.
Influence of Joint Geometrical Characteristics on Seepage of Fractured Rock
Authors: Man Ke , Wang Ju , Su Rui , Zhu Yong Qiang
Published: March 2013

It describes the geometrical parameters of the joint surface in the fractured rock, through two parameters, i.e. JRC (Joint Roughness Coefficient) and JMC (Joint Matching Coefficient). Following these coefficients, the geometry of the surface has been measured exactly. Meanwhile, the rock deformation and seepage characteristics have been mainly defined by the joint surface, so the influence of JRC and JMC on the aperture width and the seepage properties have been deeply studied. Based on the cubic law of the flow water, the two parameters incorporated into the law and the permeability of the fractured rock has been obtained.
Study on Measuring Particle Size Distribution of a Nanodiamond Powder
Authors: Wei Qi Long , Meng Yu Tang
Published: March 2013

Particle size distribution (PSD) of a nanodiamond powder in a high concentration suspension was measured by a new dynamic light scattering (DLS) technique based on the Doppler frequency shifting effect. Influence of dispersing pre-treatment, distribution bases and materials’ properties on DLS results was analyzed, and PSD results were validated by TEM analysis. It was found that the optimized ultrasonic dispersing time of the diamond powder in a sodium hexametaphosphate (SHP) solution was about 5 minutes. And median sizes of the nanodiamond powder were 115.6 nm, 53.0 nm and 32.6 nm, based on light intensity, volume and number respectively. PSD results of the nanodiamond based on number accorded well with results from TEM analysis. And PSD results were affected hardly by refractive indices of the diamond and the dispersing medium, while they were affected markedly by viscosity of the medium. It is concluded that this new DLS technique could measure PSD of the nanodiamond powder in high concentration suspensions which has been dispersed properly.
Analysis on the Holistic Resistant Behavior of Super High-Rise Structure Affected by the Concrete Strength of the Core of the Joints
Authors: Yang Zhao , Mei Qing Hai
Published: March 2013

There are some disadvantages in the concrete pouring method of column beam joints of super high-rise structures. If the concrete of joint core use the same strength grade with beams and plates, and pouring with them together, the construction process will be simplified and the construction quality will be easier to ensure. But the concrete strength of joint core is reduced, so whether the resistant behavior of the structure can be able to meet the design requirements is the key problem we focus on. The finite element model of a super high-rise structure was established by MIDAS software, the holistic resistant behavior of the structure was analyzed to study the effect of joint core concrete strength on the whole structure. The study provides the basis for further exploring a more reasonable pouring method of the concrete of the joints.
Design and Manufacture of the Automatic Textile Flammability Tester Based on PLC
Authors: Xu Xiao Guang , Chen Jian , Li Ying Zhou , Yin Li Juan
Published: March 2013

Based on the flammability requirements of toy and textile product in Entry-Exit Inspection, design and development the automation tester of flammability combined with PLC control technology, high-performance and fine-segmentation driver as well as step-in motor. It demonstrated the tester machinery design, work principle, control system and programming of software. It is pointed out the tester can settle for testing requirement of International standard toy safety, and also settle for testing requirement of International standard textile safety.
Sonochemical Preparation of Polymer Microcapsules
Authors: Guo Sheng Wei , Wang Gu Xia
Published: March 2013

Polymer microcapsules have important application in the fields of biochemistry and materials science owing to their unique structures and functions. Poly(styrene-methyl methacrylate) (PS-co-PMMA) microcapsules were prepared through sonochemical method. The results reveal that it is difficult to form a microcapsule structure from neat styrene (St). However, MMA can improve the interface condition for its higher hydrophilicity. Therefore, it is easier to form hollow structure because polymer microcapsules have a lower interface free energy per unit area. FTIR results confirm that polymer microcapsules have both the typical peaks of PS and PMMA. The results of dynamic light scattering (DLS) and TEM show that PS-co-PMMA microcapsules are uniform in size(about 100 nm in diameter and 20~25 nm in shell thickness).
Research on Dynamic Response of Q235 Steel Cylindrical Shell Subjected to Lateral Explosion Loading
Authors: Gao Fu Yin , Long Yuan , Ji Chong , Zhang Chang Xiao
Published: March 2013

Experimental researches were presented on dynamic characteristics of Q235 steel cylindrical shell impacted-explosive laterally by 75g cylindrical TNT dynamite at the center．The dynamic response was obtained under different distances with different setting ways of explosive sources．By means of an explicit nonlinear dynamic finite element computer code LS-DYNA，the nonlinear dynamic response process of cylindrical shell subjected to laterally explosion loading were numerically simulated with ALE coupling method. The numerical simulation results were in good agreement with experimental data. The results provided important reference for the blast-resistant properties analysis and safety assessment of oil-gas pipes safety.
Femoral Head Lag Screw Position for PFN: A Biomechanical Analysis
Authors: Wang Dong Dong , Zhu Wei Min , Tan Lei , Li Ming , Guo Yuan Li , Zhang Lei Feng , Zhu Dong
Published: March 2013

Objective To compare the biomechanical properties of two lag screws proximal femoral nail(PFN) when they are placed in different points of the neck of femur in the treatment of intertrochanteric fracture of femur. Method Three pairs of fresh femora of adults aging from 55 to 65 are taken. They are made into AO type A1.1 intertrochanteric fracture. Fracture specimens are fixed by PFN. The mechanical testing machine loads the fracture model at a speed of 0.5mm/s. The stress distribution of the fracture broken ends, the opening angle of the fracture broken ends, and the relationship between load and displacement are recorded respectively. Result The stress change of the group inferior of the small trochanter is smaller than that of the group superior. The opening angle of the fracture of the group inferior is smaller than that of the group superior. The displacement of the top of the femoral head of the group inferior is smaller than that of the group superior. Conclusion The performance of the group inferior is better than that of the group superior. Thus it can be concluded that when two lag screws of PFN were placed in the middle and below 1/3 part of femoral neck, the biomechanical properties are better, the structure is relatively more stable, and the stress bearing is more reasonable.
Suspension Wires Parameters Analysis of Structural Resonance of 3-Axis BD Optical Head Actuator
Authors: Hu Sheng Yong , Luo Jun
Published: March 2013

Force distributions on coils have been simulated with vector magnetic analysis. Resonance of 3-axis optical head actuator has been obtained for 50.5Hz, 54.8Hz and 205.2Hz in focus, track and tilt directions respectively with ANSYS modal solution. Resonance frequency is mainly determined by suspension wires, and Wire-angle, length, radius and sections are main wires’ parameters. The effects of suspension wires’ parameters on resonance response has been gotten and discussed.
The Role of the Energy Density in Pulsed Laser Deposition of Bioactive Glass Films
Authors: Zhao Ya Fan , Song Ming Da
Published: March 2013

Effect of the energy density on the composition, morphology and deposition rate of the bioglass thin films deposited by pulsed laser was studied by energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM), X-ray diffraction (XRD) and crystal lattice monitor. There is slight compositional difference between the film and the target at lower energy density. Morphology of the films is compact with the particles on the surface of them. Structure of the films is amorphous glass and the size of the particles increases with the energy density. Deposition rate increases with the energy density and the energy density threshold of the film growth is about 2.5J/cm2.
The Detecting Method Investigation on Phase of EPDM Carbon Layer Surface in Solid Rocket Motor
Authors: Xue Rui , Liu Pei Jin , Wang Shu Xian
Published: March 2013

A new Phase-detecting device which can be used in real solid rocket motor (SRM) working environment was designed. By connecting this device up to an ablation experiment SRM, the impacted morphology of carbon layer surface was obtained and observed by SEM. Based on the demolishing pattern of the carbon layer surface, the real phase state of the carbon layer surface during SRM operation was also analyzed. The forming cause of this phase state and the mechanical capability of EPDM in real SRM environment were discussed briefly. Studies show that this new Phase-detecting device is a powerful tool for the research on insulator’s ablation theory and experiment, and the experimental results may provide a convictive evidence for ablation modeling.