bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Different Connection Types of Air Spring
Authors: Gao Hong Xing , Chi Mao Ru , Zhu Min Hao , Wu Ping Bo
Published: September 2013

Three accurate dynamic model of air spring was set up through aerodynamics, fluid mechanics, structural mechanics,engineering thermodynamics, etc. According to the new established bellow-orifice-reservoir model, bellow-pipe-reservoir model and bellow-orifice-pipe-reservoir model, the dynamic characteristics of air spring were calculated under different excitation amplitudes and frequencies. By comparison with experimental results, it shows that the simulation results of the three models and experimental results coincide very well in dynamic characteristics; the bellow-orifice-pipe-reservoir connection type is recommended as the secondary suspension for low frequency excitations; and the bellow-orifice-reservoir connection type is considered effectively for high frequency excitations; the bellow-pipe-reservoir connection type is not recommended to be used as the secondary suspension because of its negative stiffness.
Research on Bearing Characteristics of the Digging Foundation in Slopes Based on Interface
Authors: Peng Bin , Shang Yi Min , Tan Rui Shan , Mei Tao
Published: September 2013

The numerical simulation model was established by using numerical simulation tools of FLAC3D, through establishing interface for digging foundation-soil, which can consider mutual effect of digging foundation-soil. Bearing capacities of the digging foundation in slopes is calculated. The affecting factors of the bearing capacity are analyzed. The results show that the bearing capacity has a positive correlation with the distance between the foundation and the slope and has a negative correlation with the slope ratio, which can be expressed as a quadratic polynomial. Nonlinear regression analysis of calculation data are carried out and the fitting formula of the capacity ratio between pile in the slope and pile in the flat is obtained. Finally, the calculation method of horizontal bearing capacity about pile in the slope is developed, which can provide a reference to specification revision and engineering.
Study on the Recycling Machine of Plastic Film with Shovel-Excavation Screening
Authors: Liu Ying Chao , Jian Jian Ming , Chen Ying Ding , Hou Shu Lin
Published: September 2013

In order to solve the problems that the current components using for recycling the film in the Plastic film recycling machine are not suitable for a large quantity of coating stubble corn plastic film recycling. Based on the work principle of “shovel-excavation screening”, developing the whole design:shovel film stubble→topsoil delivery→soil sieve→set the heap surface.By optimizing the design and combination of various components to achieve plastic film recycling of corn stubble. This machine can meet the requirements of recycling the film, raising the stubble and grounds care in the alpine arid regions. It can solve the difficult problems about the uneasy recovery of the serious damage film and the film recycling of the stubble crops like corn.The experiment showed:①The plastic film recycling on topsoil can use the way of shoveling, in the first step all the film was picked up from the topsoil.②At the same time it can be able to recycle the film containing 22.5% corn stubble.③ The plastic film recovery on the topsoil can reach or over 90%.
The Influence of Gd on AM60B Magnesium Alloys' Structures
Authors: Feng Jun
Published: September 2013

this Paper studies the influence of Gd, a rare-earth element, on AM60B Mg cast alloys structures and, after the analysis of scanning electron microscope (SEM) and energy spectrum analysis, as well as the observation and analysis of XRD, demonstrates Gd could change the precipitates and precipitated phases of Mg cast alloys. The result shows that the adding of Gd to AM60B alloys may effectively refine the alloys structures and the generation of rare-earth compounds, and be conducive to improving the fracture ways of magnesium alloys.
Modeling and Real-Time Simulation on Doubly Fed Induction Wind Generator
Authors: Tian De , Song Hai Hui , Wang Wei Long
Published: September 2013

The doubly fed induction generator (DFIG) can alter speed of the rotor according to change of the wind speed, then contains the maximum tip speed ratio, in order to capture the maximum power from the wind energy. This paper studys the maximum wind energy capturing of DFIG. The fuzzy controller here is used to control the doubly fed induction wind generator in order to improve the robust of the system. We established a fuzzy control rule according to the maximum power capturing. The fuzzy controller captures the maximum power with generator power output error and generator rotor speed error to generate reference speed, which contains the maximum tip speed ratio. The theory analysis and simulation results based on MATLAB / Simulink demonstrate that this control strategy is convenient and efficient.
Coordinated Joint Development of Manufacturing and Morden Logistics
Authors: He Hui
Published: September 2013

In this paper, through comparison and analysis of manufacturing logistics development present situation at home and abroad and points out the outstanding problems existing in the development of national manufacturing logistics. Manufacturing enterprises according to their own production type, enterprise scale and technology base to determine the outsourcing strategy, and selection of supply chain partners. Especially in the process of strategic transformation, should have the courage to overcome obstacles to implement process restructuring, enables companies to new look to meet the challenge of the era of global supply chains.
Equilibrium and Non-Equilibrium Solution of Nonlinear Population Evolution Systems
Authors: Wang Jin Mei
Published: September 2013

We provide conditions for the existence of equilibrium and non-equilibrium solutions about nonlinear population evolution systems with fixed population.
Industrial Process Measurement and Control Equipment Reliability Analysis Based on Physics of Failure
Authors: Wang Cheng Cheng , Liu Xiao Jing , Mei Ke
Published: September 2013

Industrial process measurement and control equipment is the basis for survival and development of the mechanical industry, related to the lifeblood of the national economy, at the same time, industrial measurement and control equipment widely used at high temperature and strong corrosive environment, with high reliability requirements. Traditional reliability analysis method is derived from electrical and electronic industry, based on the probability and statistics, in conformity with industrial measurement and control device characteristics, greatly limits the development of industrial measurement and control industry reliability, this paper presents a reliability based on failure physics theory analysis method, found the fault mode, with the simulation analysis and physical test, the product has carried on the accurate life is expected to verify the feasibility of this method, the reliability method worth to further research and promotion.
Innovation in Low Carbon Printing & Packaging
Authors: Qu Zhen Cai
Published: September 2013

The connotation of green printing and packaging was discussed, the fact was clarified that green printing and packaging was the inevitable trend of the sustainable development of printing and packaging industry in a low-carbon economy. The major problem faced with the current printing and packaging industry was analysed, effective measures were provided to actively promote the development of green printing and packaging industry, which gives some theoretical guidance to accelerate the development of green printing and packaging.
Research on Temperature Compensation Method of Quartz Flexible Accelerometer
Authors: Mu Sen Lin , Chen Fu Bin , Gao Jing Min , Wu Zhi Zhong
Published: September 2013

In view of the problem of quartz flexible accelerometer output which is influenced by temperature, through the 12 gravity rolling experiment method, the temperature model of the partial value and the scaling factor of the accelerometer can be established in the designed experimental platform. Thus, the temperature compensation model of the accelerometer can be determined. It basically eliminates the output error of the accelerometer which varies with the temperature and improves the output precision of the accelerometer.
Design of Measure and Control System of the Ring Block Casing Wear Tester
Authors: Yang Xiang Tong , Wang Xiao Zeng , Cao Yin Ping , Dou Yi Hua
Published: September 2013

In deep wells and ultra-deep wells the complex geological conditions often result in serious casing wear. In order to obtain the wear efficiency which is used to compute the wear depth of downhole casing, the ring block drillpipe casing wear tester is developed. The measure and control system which include the measure circuits of contact forces between casing and drillpipe samples, the measure circuits of the friction forces are main component of wear tester. It is very important to design the measure and control system of tester. The paper also develops the calibration method of the loads sensors used to measure the contact and friction force. The wear tester can accurately measure the wear efficiency and the friction coefficient needed by casing wear prediction.
Advances in Data-Driven Monitoring Methods for Complex Process
Authors: Chen Ru Qing
Published: September 2013

In modern industrial processes, effective performance monitoring and quality prediction are the key to ensure plant safety and enhance product quality. The research significance and background of process monitoring and fault diagnosis technologies are described and the current advances in data-based process monitoring methods are summed up in this paper. Then the multivariate statistical process control (MSPC) methods for process with single constraint, especially for single non-Gaussian process or nonlinear process are elaborated. As real industrial process data often show strong non-Gaussian and dynamic behaviors, study on monitoring technologies for dynamic non-Gaussian process is of great importance. Finally, some challenges such as non-Gaussian and dynamic process, fault detection and diagnosis as well as new MSPC methods are indicated.
A Simple Method for Data Processing of Surface Dynamometer Card
Authors: Sun Wen , Wang San Min , Ren Tao
Published: September 2013

The surface dynamometer card is considered as the primary data for a computer analysis of a sucker rod pumping well. There are many problems in the information retrieved from the surface dynamometer card involving duplicated data and reverse direction data (RDD) ,and discontinuous data of the upstroke or the downstroke , etc. This paper presents a simple method for data processing of surface dynamometer card,it is very useful for the dynamics analysis and structural optimization design of pumping unit (PU).
Research of Vector Hydrophone Adaptive Signal Processing
Authors: Ma Bo Le , Cheng Jing Fang , Zhang Wei
Published: September 2013

As a useful tool for line spectrum detection in underwater signal ,ALE has been used wildly. But there are still some problems to influence the effect of ALE. This paper gives three problems on ALE and analyses these.Then by the characteristics of vector hydrophone and a improved variable step size LMS,this paper constructs a cascade double input with variable step size based on vector hydrophone line spectrum enhancer . This algorithm restrains the noise of main channel twice ,meanwhile controls the noise in reference channel , so as to improve signal to noise ratio better. At the same time ,because of adopting the improved variable step size LMS, the steady-state error is reduced. From the results of simulation and experiment, the method presented in this paper can have a better effect of line spectrum enhancement.
Research of Smart Composite Insulator with Optical Fiber Bragg Grating
Authors: Yang Hong Lei , Liang Shi Bin , Miao Xue Peng , Cao Min , Chang Ming
Published: September 2013

On-line monitoring of lightning,ice,short circuit on electric transmission line and insulator's operation state is of great significance to ensure the safe and stable operation of the electric transmission line.An intelligent composite insulator,in which the core rod has fiber Bragg gratings is developed.lightning,ice,short circuit on electric transmission line and insulator's operation state can be reflected by monitoring the center wavelengths of the fiber Bragg gratings.The temperature, strain response and electrical performance testing experiments on 110 kV fiber composite insulator were done,the result indicates that the optical fiber composite insulator can measure the temperature accurately;the load of composite insulator can be monitored approximately by no. 2 and no.4 monitoring sites;the110 kV fiber composite insulator’s dry lightning impulse withstand voltage is 421 kV,the normal polarity of steep wave impulse voltage withstand voltage is 434 kV(steepness:1206kV/μs),the negative polarity withstand voltage is 444 kV(steepness:1132kV/μs)and the dry power frequency withstand voltage is 230 kV at the altitude of 1970m.
Image Matching Application Based on Modified SURF Algorithm
Authors: Ma Zhen Yuan , Shi Shi Xu , Yuan Li Xian , Gu Pei Chang , Huang Han
Published: September 2013

The key technique to increase the accuracy of electronic marking is the technique of image matching, namely to match two doubtfully duplicate images. Currently there are few technologies aiming for features on test paper images with high performance on matching accuracy. The research is based on SURF algorithm and specific to the features of test paper images. Thus the research is to put forward the modified algorithm with constraints among feature spots of orientation angles on their geometrical positions, including differential constraints on critical points from approximate blank test papers with less individual features at the same time. After processing and analyzing 2,000 test paper gathered from one actual examination, the results show that the modified detection algorithm has 100% false rejection rate and 100% accuracy when it is used to detect the test paper matching.
The Analysis of Sporopollen Data Based on Fuzzy Mathematics
Authors: Wang Cui Xiang
Published: September 2013

This paper analyzes the sporopollen samples based on the transitive closure method of fuzzy equivalent relation and gets the classification results, while using the F statistic gives the best classification result, and determines its ownership of an unknown class sample by taking advantage of fuzzy pattern recognition methods.
The Experimental Research on the Static-Loaded Beam Based on the Artificial Neural Network Technique
Authors: Zhang Jun , Cai Qing Yang , Tang Hong Mei , Guo Bang Zeng
Published: September 2013

In order to identify the force on coupling beam, the study of static-loaded diagnosis based on the EMI and ANN techniques is introduced. The theory of EMI and ANN techniques was introduced. The experimental platform was build. The situation of coupling beam was diagnosed by the different curves. The static-load was diagnosed by the ANN technique subsequently. The experiments show we can through the EMI and ANN techniques to identify the force on coupling beam.
Research and Implementation of Lithium Primary Battery Management System for Mine Rescue Equipment
Authors: Wang Jian Jun , Yuan Xue Qing , Li Bo
Published: September 2013

This coal mine rescue equipment can provide emergency refuge, basic conditions for survival for distress miners in event of a sudden emergency. In accordance with the mining flameproof (and safety) type lithium manganese dioxide primary battery power and other safety technical specification, developed a lithium primary battery management system which uses the 32 bit LPC1758 as its master controller MCU cooperate with C8051F500 as its slave controller MCU.This system can be real-time monitoring of various operation parameters of the battery and it is a system with safety and reliability, high degree of automation, flexible combination and other advantages. This system is able to meet various mine emergency rescue equipment energy demands.
Study on the Storage of Chinese Character Font Library and Graphics Library on SPI Flash Chip
Authors: Shen Lin , Du Gang , Hou Ya Hui , Zhang Na Na
Published: September 2013

Two kinds of method writing Chinese character font library and graphics library to external SPI interface flash chip via USART and SD card are designed and realized. By using the SPI Flash chip to store Chinese character font library and graphics library, it can achieve the human-machine interface which uses a variety of user-defined Chinese font and pictures and effectively reduce the microcontrollers internal memory consumption. It can be widely used in small embedded systems.
Study on Improved Fuzzy Immune PID Controller for Maglev Transportation System with Track Irregularity
Authors: Song Rong Rong , Ma Wei Hua , Chen Zi Li
Published: September 2013

Track irregularity is one of the most important aspects of the suspension control performance impact in maglev transportation system (MTS). Due to the track irregularity phenomenon of suspension system, the Fuzzy PID(F-PID) control is unable to accurately track irregularity of track changes. Based on the qualitative analysis to MTS, through modifying conventional F-PID controller, the article establishes Fuzzy Immune PID(FI-PID) Controller based on the biological immune system theory. The control strategy designed nonlinear P controller, using the immune algorithm of on-line adjustment of P and the fuzzy control approximating the nonlinear function of the immune P control parameters and the fuzzy control designed the ID controller for adjusting the parameters of I and D for enhancing the robust performance of the suspension system and adapting to the change of track irregularity. Simulation results show that the FI-PID control is confirmed more effectively to realize tracking compared with F-PID, faster response speed, more simple structure, easier operation for the track interference and load disturbance of the suspension system. This provides a very good way to solve the interference problem of orbit of the maglev transportation system.
A Method of High Accuracy Control for Motor-Based Photoelectric Tracking Instrumentation Base on Inclinometer
Authors: Ning Da Yong , Sun Chang Le , Gong Yong Jun
Published: September 2013

A mathematic method of ensuring motor-based photoelectric tracking instrumentation work high accurately was introduced, the SCA100T inclinometer was settled under the base, and examine plane of base real-timely. The inclinometer output analog signals and transmit it to AT89C51 through A/D converters, and AT89C51 output digital signals and transmit it to PC through RS-232. The PC convert signals of inclinometer into angle values of horizontal axis and vertical axis and transmit the values to main controlled system of photoelectric tracking instrumentation, the controlled system change the angles of horizontal axis and vertical axis. The CAD model was built and simulated with virtual prototype technology .Analysis and simulation proved that the mathematic method could keep tracking precision of motor-based photoelectric tracking instrumentation.
A Framework of an Intelligent Process Planning System for Milling Based on STEP-NC
Authors: Ouyang Hua Bing
Published: September 2013

STEP-NC is an extension of STEP that defines a machine independent bi-directional data standard for Computerized Numerical Control (CNC) systems. A framework of an intelligent process planning system for milling based on STEP-NC is proposed. Four functional layers are involved in the software-based framework of STEP-NC intelligent process planning system. The intelligent technology, such as neural network, fuzzy logic and genetic algorithm, is utilized to generate and optimize the process route. The implementation of the purposed prototype system named ST-ICAPP is presented based on Solidworks. An example is given to demonstrate the feasibility and efficiency of the prototype system. As a result, this research shows a high potential to aid the development of new CAPP milling system.
Influence of POSS Content on the Thermal Properties of PAN/POSS Nanofibers
Authors: Zhou Sheng Zhi , Song Xiao Yan , Cheng Bo Wen
Published: September 2013

PAN/POSS nanofibers membrane with different content POSS have been prepared by electrospinning. The morphology and thermal properties of PAN/POSS nanofibers are characterized by SEM and DSC, respectively. The addition of different content of POSS into PAN matrix have a slight effect on the diameter of nanofibers. Compared to pure PAN fibers, the exothermic peak shift to higher temperatures by 6.8°C when POSS loading is 3wt%, and the corresponding Tg have increased 17.3°C.
Study the Wet-Absorb and Fast-Dry Properties of the Coolplus Fiber/Cotton Compound Fabrics
Authors: Xu Guo Ping , Luo Xin Hao , Qiu Hai Bin , Zhu Yan Jun
Published: September 2013

In order to understand the relation between the wet-absorb and fast-dry properties and the blended ratio of the fabric made from Coolplus fiber and cotton, four kinds of fabric were prepared and the wet-absorb and fast-dry properties were studied. It was found that, the wet-absorb and fast-dry properties of fabric were improved with increasing the Coolplus fiber content and there was a good moisture absorption perspiration performance when its content was accounted for 60%. After 30 min, the wicking height of the Coolplus/cotton blended fabric was about 18.2 cm and the residual moisture rate was less than 7%, showing the great wet-absorb and fast-dry properties.
Study on Magnetic Polymer ICF Target Prepared by the Electroless Plating
Authors: Cui Shao Bo , He Feng Wei , Lu Zhong Yuan
Published: September 2013

The magnetic polymer ICF targets are fabricated by depositing the Ni-P coats of on the surface of polystyrene microsphere by the electroless plating. The thickness and composition of the coat, and the surface roughness and magnetic property of the magnetic microsphere were examined and analyzed. The results indicated the examined indexes can basicallymeet the requirements of ICF targets.
Experimental Study of Material Thickness Effect on Combustion Characteristic for Molded Polystyrene Board
Authors: Zhang Miao , Song Wen Hua , Liu Xing Na , Li Chang Hai , Wang Ji
Published: September 2013

In this paper, the experimental platform about combustion characteristics of thermoplastic insulation materials is designed and established. The material surface temperature, heat release rate, flame height and pyrolysis position of different thickness of molded polystyrene board are obtained. Research results show that the flame spread rate increased with the increase of the thickness of material thickness and the fire spending increase decreases first and then increases. Considering the heat preservation performance and combustion performance of this material, 50mm is the critical thickness.
Stress Wave in Gelatin from Temporary Cavity
Authors: Mo Gen Lin , Wu Zhi Lin
Published: September 2013

To study the injury mechanism of stress wave from temporary cavity in gelatin, a stress wave propagation model is established. Based on experimental phenomena, gelatin around the trajectory is divided into fail region and elastic region. In the fail region, gelatin is considered to be incompressible and loop stress is zero. Gelatin in the elastic region is assumed to be plane-strain. Moving equations in the two regions are built. A 4.8 mm steel sphere is fired into gelatin at 720 m/s. Displacements of the temporary cavity are obtained from the experiment. By solving the moving equations with boundary conditions, amplitude of cavity pressure, radial stress distribution in gelatin are obtained. The theoretical results can be used to explain stress waves produced by temporary cavity.
Anti-Aging Effects of Deoxyschizandrin in D-Galactose-Induced Aging Rats
Authors: Huang Xiao Dong , Ying Jian , Wang Yan Chun , Ren Kuang
Published: September 2013

Objective: To investigate anti-aging effects of deoxyschizandrin in rats and its mechanisms. Methods: D-galactose (120mg • kg-1 • d-1) was subcutaneously injected daily for 6 weeks to build a rat aging model, and deoxyschizandrin (50,100 and 200 mg • kg-1 • d-1) was consecutively administered daily for six weeks from the second day. Morris water maze was used for the observation of learning and memorizing abilities of the rats; spectrophotometry was applied to detect malondialdehyde (MDA) contents, superoxide dismutase (SOD) activities, glutathione peroxidase (GSH-Px) activities, Na+-K+-ATPase and Ca2+-ATPase activities in the rats’ brain tissues. Results: The results showed that moderate-dose and high-dose deoxyschizandrin could improve learning and memorizing abilities of D-galactose-induced aging rats, enhance SOD, GSH-Px, Na+-K+- and Ca2+-ATPase activities, and reduce MDA levels in the rats’ brain tissues significantly (P <0.05 or P <0.01). Conclusion: deoxyschizandrin can improve rats’ learning and memorizing abilities, and its mechanisms may be associated with the increase in antioxidant enzymes such as SOD and GSH-Px in the body, the decrease in the production of MDA, the enhancement of ability to scavenge free radicals and inhibit lipid peroxidation to protect the brain cells from the damage by free radicals.
Cardioprotective Effects of Lignanoid against Doxorubicin-Induced Oxidative Stress in Rat
Authors: Wang Yan Chun , Ren Kuang , Meng Lin , Fan Hong Yan , Shen Nan
Published: September 2013

This study was aimed to investigate the protective effect of lignanoid against doxorubicin-induced cardiotoxicity in rats. Doxorubicin were administered at the dosage of 5 mg/kg once a week, ip for a period of 5 consecutive weeks. Lignanoid were administered at the dosages of 25, 50 and 100mg/kg, po by gavage for 7 consecutive days in a week for 5 weeks. Lignanoid at the doses of 50 and 100 mg/kg significantly reduced CK-MB, NO and LDH and increased GST levels in the doxorubicin-treated group. Thus, lignanoid ameliorated doxorubicin-induced cardiotoxicity by reducing oxidative stress, abnormal cellular morphology in rat. This study indicates the protective effect of lignanoid against doxorubicin-induced cardiotoxicity.
Synthesis, Characterization and Properties of the IA / SAS Copolymer
Authors: Liu Zhen Fa , Fu Hao Lin , Zhang Li Hui , Zhang Yan He , Liu Xuan
Published: September 2013

A copolymer was prepared from itaconic acid (IA) and sodium allysulfonate (SAS). The structure of the IA/SAS copolymer was characterized by the means of FTIR. The performances of scale inhibition, dispersion and biodegradability of the IA/SAS copolymer were studied. The results showed that the IA/SAS copolymer had good scale inhibition and dispersing performance. The scale inhibition rate on calcium carbonate was 93% when the copolymer was 20 mg·L-1. The scale inhibition rate on calcium phosphate was 92% when the copolymer was 24 mg·L-1. The copolymer had good biodegradation performance and biodegradation rate could reach 69.5% after 28 days.
Influence on Afterglow Spectra due to Different Phases of Zn3(PO4)2: Mn2+
Authors: Liu Zi Ran , Zhong Rui Xia , Zhao Hui , Zhang Xiao Yan
Published: September 2013

High temperature solid state reaction has been used to prepare Zn3(PO4)2: Mn2+. XRD analysis shows that different phases have been generated with different Mn2+ doping concentration at the same sintering temperature. Low Mn2+ doping concentration is conducive to form α phase, while γ is in favor of high Mn2+ doping concentration. In α phase, the emission spectrum of Mn2+ is a wide emission band peaking at 542 nm, green fluorescence. In γ phase, the emission spectrum of Mn2+ is a wide emission band peaking at 608 nm, red fluorescence. In the both phases, green and red afterglows have been observed. The red afterglow in γ phase has stronger initial brightness and longer afterglow decay time than the green afterglow in α phase, the reason of which lies in the larger trap concentration in γ phase.
On Antireflective Coatings with Stable Hydrophobicity for Solar Tube
Authors: Dou Wen Wen , Niu Yu Chao , Liu Xiang Ju , Wang Xiao Li , Xu Yong
Published: September 2013

Antireflective coatings with stable hydrophobicity for solar tube were prepared via sol-gel method and hexamethyldisilazane (HMDS) treatment. The coatings have a high porosity, groove-like surface morphology and a big static water contact angle. As a result, the coatings exhibit high transmittance even in high humidity environments. The transmittance peak can reach up to 99.02% which increased by 7% compared with the substrate and the wavelength band increased by more than 5% is from 438nm to 1000nm. After prolonged exposure to strong ultraviolet (UV) irradiation, the static water contact angle of the HMDS treated antireflective coatings decreased very small from 102o to 98o. In addition, the low-temperature tests showed the contact angle did not decline even at-50°C. The results suggest that the coatings prepared in present paper have stable hydrophobic and antireflective performance in the environment of strong UV radiation and low temperature.
The Temperature Field Caused by Sphere Inclusion in Dielectric Irradiated by Multi-Pulse Laser
Authors: Huang Cai Hua , Sun Xiao Hua , Sun Yi Hua
Published: September 2013

The thermal effect caused by absorbing inclusions irradiated by multi-pulse laser is different from that of single pulse laser. The temperature field induced by multi-pulse laser depends markedly on both inclusion size and pulse duration, and repetition interval of pulse. Based on the differential equation of heat conduction, the temperature field caused by single absorbing inclusion is solved by use of finite difference method. The effect of inclusion size, pulse duration and repetition interval of pulse on the evolution of temperature field at the center of inclusion and interface between inclusion and dielectric are discussed qualitatively.
Effect of Temperature on Decomposition of Magnesium Bicarbonate
Authors: Li Yan , Wang Xiao Jun , Wu Bin , Tang Hong Jian , Xie Yu Yu
Published: September 2013

The composition of basic magnesium carbonate varies, mainly due to the decomposition conditions of magnesium bicarbonate. In the present study, we researched the specific composition of samples prepared at different decomposition temperatures of magnesium bicarbonate. Combining XRD, TG-DSC and wet chemical analysis, we found that single component which the formula is MgCO33H2O can be got at room temperature (30 °C). Content of MgCO33H2O in the decomposition products decreases with the increase of decomposition temperature. The decomposition products obtained at 90 °C is 4MgCO3Mg (OH)24H2O based and contain a little MgO, Mg (OH)2, trace amount MgCO33H2O and 4MgCO3Mg (OH)25H2O. Further study show that content of MgCO33H2O influences the density of final product of magnesium oxide. Density of magnesium oxide got by calcining MgCO33H2O is 0.944 g.ml-1, and density of magnesium oxide got by calcining product that was prepared at 90°C is 0.078 g.ml-1.
Analysis to Mullite Bonded Corundum Purging Plug
Authors: Ren Xue Hua , Zhao Ping , Lai Qi Hui , Qin Xuan
Published: September 2013

We chose a purging plug with good performance to analyze its insert plate. By X ray fluorescence analysis method, the main chemical composition is alumina and the small amount is silica. XRD analysis shows its phase compositions, main crystal phase is corundum, the secondary phase is mullite. SEM analysis is for the microstructure, grains are packed closely. They are sintered tabular corundums with smooth shape, which means there is liquid phase in sintering process to help mass transfer. As a conclusion, this product is designed from the point of material selection and structure control to improve its thermal shock resistance. Compacted microstructure combining with good thermal shock-resistance mineral phases improve the service life of purging plug.
The Influence of Technological Conditions on Cell Density and Cell Morphology of PPESK Microporous Material
Authors: Qu Min Jie , Li Tian Qi , Zheng Lai Jiu , Zhu Shi Yang , He Ling Ling , Guo Jing , Gong Yu Mei , Du Bing
Published: September 2013

Phthalazinone structure contained phthalaazione ether sulfone ketone (PPESK) is a kind of excellent engineering plastic with high temperature resistance and resolvability. In this paper, SC-CO2was used as foaming agent to prepare PPESK foams by temperature rising method. The influence of technological conditions like foaming time, foaming temperature and saturation pressure on cell density and cell morphology was discussed and analyzed.
Preparation of F, Cl and Nitrogen Doped TiO2 and their Photocatalytic Properties Research
Authors: Hou Chen Tao , Lv Fei
Published: September 2013

In the paper, sol-gel method has been used to make F-N, Cl-N co-doped TiO2 photocatalyst by the artificial zeolite as a carrier. The optimum doping and the best roasting temperature was found. The results showed that N, F co-doped photocatalyst can calcine at 400 °C, and when used in the best doping ratio as n (n-butyl titanate): n (ammonium chloride): n(N)= 1:0.01:0.012, its degradation rate can reach 92.4% in 3.5 hours. The N, Cl co-doped can calcine at 500 °C, and when used in the best doping ratio as n (n-butyl titanate): n (ammonium chloride):n(N) = 1:0.01:0.012 ,and the degradation rate of up to 88% in 3.5 hours. Scanning electron microscopy SEM and UV-visible spectrophotometry methods were used to analysis them,The results show that the experiment photocatalyst prepared in good condition. In the visible condition of the catalytic performance. The effection of F-N catalytic is better than Cl-N, and the degradation of methylene blue in 3.5 hours can reach 92.4%.
Influence of Cu Doping on the Thermoelectric Properties of Bi1.5Pb0.5Sr1.8La0.2Co2Oy
Authors: He Qing Lin , Guo Zhan Ying , Hu Xing , Song Hong Zhang
Published: September 2013

Cu doped Bi1.5Pb0.5Sr1.8La0.2Co2-xCuxOy(x = 0.0, 0.2, 0.4) samples were prepared through the solid state reaction method. The influence of different Cu doping contents on electrical resistivity, Seebeck coefficients, thermal conductivity, and the dimensionless figure of meritZTwas investigated. All the samples of Cu concentration 0.4 are single phases. The electrical resistivity of Bi1.5Pb0.5Sr1.8La0.2Co1.8Cu0.2Oydescends, and itsZTvalues are enhanced obviously. The results show that suitable element doping can modify the electric transport properties and enhance thermoelectric properties of materials.
The Performance Evaluation of Potassium Drilling Fluid System
Authors: Liu Qing Wang , Zhang Shou Song , Fan Zhen Zhong , Wang Ji Gang , Lou Yan Min
Published: September 2013

The basic prescription of the potassium sulfate drilling fluid is: 5% bentonite+0.4%Na2CO3+5.0%K2SO4+1000ppmDCL+200ppmDesco+100ppmAlcome+500ppmSAP+1000ppmLT+1000ppmKEL. The content of K+ is 50000mg/L. The drilling fluid has appropriate viscosity, gel and filter loss. The shale rolling recovery rate is bigger than 85%. The static swelling rate is smaller than 2%. The corn damage is less than 20%. The mechanism of protect formation is the K+ ability of preventing the clay from hydrating and swelling, the adsorption ability of formation protecting agent and the cooperating role of K+ and formation protecting agent. The potassium sulfate drilling fluid was used in fang-3 outer section of the Song-fang-tun oilfield. It was shown that the drilling fluid could meet the drilling demand in this oilfield.
Microstructure and Mechanical Property Analysis of the Metal Part by SLM
Authors: Qin Qun , Chen Guang Xia
Published: September 2013

The objective of the research was that analyzed the microstructure and mechanical properties of metal part built by SLM in this paper. The tensile samples were made by SLM, the rupture gotten with tensile experiment was scan by SEM, and the rupture property was analyzed. The results of experiment showed: the parts formed by optimized parameters have a density above 96%, a tensile strength of 635MPa, an extension of 55.679% and an average micro hardness of HV307 for stainless steel powder. It is interesting to find that the phase of the built parts is also austenite by XRD, which is the same as that of the starting material.
Effect of Grain Growth Inhibitor on the Wear of Ultrafine Cemented Carbide Cutting Inserts
Authors: Cheng Jian Bing , Pang Si Qin , Wang Xi Bin , Yu Qi Xun
Published: September 2013

By using the method of low pressure sintering, both of adding and not adding grain growth inhibitor of WC-Co ultra-fine cemented carbide cutting inserts were prepared, tool life tests of continuous cutting superalloy GH2132 were carried out, respectively. ZEISS continuous zoom stereo microscope and microphotograph system were used to observe flank surface wear morphology of the cutting inserts, and analysis the topography and elements of central wear region of flank surface by X-ray energy dispersive spectrometry and scanning electron microscope. The results show that the main wear mechanism of ultrafine cemented carbide cutting inserts is adhesive wear, and the wear resistance of ultrafine cemented carbide cutting inserts that added grain growth inhibitor is superior to no grain growth inhibitor, adding grain growth inhibitor helps increase the resistance of abrasive wear, adhesive wear and oxidative wear as well as diffusive wear of cutting inserts).
Effect of Low-Voltage Pulsed Magnetic Field on Solidified Structure of Superalloy K4169
Authors: Xie Xiao Hua , Zhou Quan , Xiao Cheng Bo , Tang Xin
Published: September 2013

Effects of different pulse voltage and frequency on solidified structure of superalloy K4169 under low-voltage pulsed magnetic field (LVPMF) were investigated in this paper, and the related mechanism was also discussed. The experimental results show that grain of superalloy K4169 can be refined greatly by LVPMF treatment during the course of solidification. Growth of dendrite is restrained and primary grain is changed from large dendrites to smaller equiaxed grains. When the pulse voltage is at 0-280V, grain size of the alloy decreases as pulse voltage increases, and primary dendrites are fractured from well-developed dendrites into fine equiaxed grains and non-dendritic structures. When the pulse frequency is at 0-5Hz, the increase of pulse frequency enhances the refinement effect of LVPMF processing. With the increase of the pulse frequency, grain size of the alloy increases.
Modeling and Prediction Research on End Mills Wear in Micro Turn-Milling Process
Authors: Su Xiao Yang , Zhang Zhi Jing , Jin Xin , Deng Yong Jun
Published: September 2013

An end mills wear experiment was designed to model and predict the end mills wear in micro turn-milling process. Based on the on-line visual measurement system, the tool wear was measured, then micro turn-milling tool wear regression models were established according to Response surface Method (RSM). The relationship between cutting parameters and tool wear was discussed in detail. The results indicate that the regression model can predict the value and regularity of end mills wear accurately, which can provide guidance on improving machining precision and quality in micro turn-milling process.
Experimental Study on Friction and Wear Behaviors of Carbon Rubbing against Copper Material under Electric Current
Authors: Ding Tao , Xuan Wen Jing , Li Yu Mei , Xiao Shu Fen
Published: September 2013

An experimental study on friction and wear properties of carbon strip rubbing against copper contact wire was carried out on a pin-on-disc frictional tester under electric current. The result indicates that the coefficient of friction slowly increases with increasing of electric current. The value of friction coefficient is low, generally not more than 0.125. The wear volume of pin specimen increases with increasing of electric current. The wear volume of pin specimen is very low, generally not more than 0.075g. Through observing the SEM morphology of worn specimens, it can be found that there are obvious pits of arc ablation and traces of melting metal on worn surface. Worn surfaces of the worn specimens are analyzed by an energy dispersive X-ray spectroscopy. It can be observed that the oxidation wear occurs in the frictional process due to arc erosion and significant temperature rise. Therefore the arc erosion and oxidation wear are a main wear mechanism accompanied by materials transferring in the process of electrical sliding friction.
Research on Powder Stream of Coaxial Powder Feeding in Laser Manufacturing Technology
Authors: Quan Heng , Wang Yun Shan , Liu Li Feng , Liu Shao Jun , Meng Qing Ruo
Published: September 2013

Mathematical-physical model of powder stream in coaxial powder feeding was established. The concentration fields of powder stream of coaxial nozzle of different size and powder mass flow rate were analyzed. The concentration field and morphology of the powder stream were detected by CCD camera. The results show that the size of coaxial nozzle and powder mass flow rate are major factors affecting the powder stream. The mathematical-physical model and experimental data provide theoretical basis for laser cladding manufacturing.
Study on Processing Technique in Engineering Tests of Mg-7.1Gd-4.6Y-1.3Nd-0.5Zr Alloy
Authors: Li Yong Jun , Zhang Kui
Published: September 2013

Combined with the pre-test results, homogenization, plastic deformation, aging and other processes of Mg-7.1Gd-4.6Y-1.3Nd-0.5Zr (EW75) magnesium alloy was studied in engineering tests. The results show that in engineering test the large ingots (Φ500×800~900mm) of the EW75 alloy using two-stage homogenization treatment had perfect homogenization effect and no burnt structure. After multi-directional forging and extruded deformation, the homogenized residual second phase particles were fully broken, and the structure was refined and uniform. The peak aged craft was 230°C×6h, with the aging time increasing, the tensile strength and elongation remained unchanged, showing a strong anti-aging ability. The two-stage homogenization treatment + multi-directional forging + direct extrusion deformation + peak aging treatment was used to prepare a high performance EW75 alloy and at longitudinal direction its ultimate tensile strength, yield strength and elongation were 450MPa, 385MPa, 12.0% respectively.
Research on Modeling and Simulation of Linearity Controlling in Gun Drill Machining
Authors: Chen Shu Qin , Li Yao Ming , Bai Pei Kangc , Shen Xing Quan
Published: September 2013

With the diversified market demands, the high precision deep hole processing increased and the difficulty coefficient has been getting greater, Therefore, how to improve the deep hole linearity problem is also imminent. This article studies on the linearity deviation problems in the process of small deep hole processing which diameter is between 3 and 16. From the parameters of gun drill cutting tools, accessoties of machine, and the vibration system of machine tools in the machining process, etc., to discuss the reasons affecting the linearity and put forward corresponding solutions for various influencing factors. Finally through computer analysis software and experimental means to verify the feasibility of the scheme.
Piezoresistivity of Polymer-Derived AlSiCN Ceramics
Authors: Zhang Li Gong , Wang Yan Song , An Li Nan
Published: September 2013

The conductivity of amorphous AlSiCN ceramics derived from polymer pyrolysis were investigated under applying stress. A huge gauge factor was observed, just as that of SiCN ceramics with a proper thermal initiator, and their piezoresistivity are a strong sensitive to stress applied. The high piezoresistivity effect and sensitivity to stress are due to compositional and mechanical properties of polymer derived AlSiCN ceramics.
Behaviors of Immersion Flow in Micro-Gap with Moving Boundary
Authors: Chen Hui , Du Heng
Published: September 2013

In order to improve the flow stability when wafer scans at high speed, immersion lithography with small flow-thickness is proposed for the high resolution lithography. By using the three-dimensionally numerical methods, the immersion flow in micro-gap is investigated to analyze the behaviors of liquid flow. Based on the flow characteristics of typical structures with different liquid thickness and scanning speed, the liquid mean-velocity on account of thousand sample points in the exposure area are studied, and the appropriate parameters and method of effective renovation with small thickness are also given.
Acoustic Emission Characteristics of Sericite Schist Coarse Aggregates under Consolidated Undrained Triaxial Tests
Authors: Yang Lan Qiang , Qin Shang Lin , Gao Hui , Chen Shan Xiong
Published: September 2013

In order to study the acoustic emission characteristics of coarse aggregates, improved of large-scale triaxial apparatus is used to do the consolidated undrained triaxial tests of sericite schist coarse aggregates, with the acoustic emission signals monitoring. The test results show that a large number of AE signals of sericite schist coarse aggregates are generated in the initial stage. Before the axial strain reach 10%, AE counts are relatively quiet. But after 10%, they become anomalous and emerge obvious leap values. When the confining pressure up to 200kPa, AE signals are mainly generated by sliding friction. With confining pressure increasing, the proporation of rolling friction and particle breakage is more and more obvious.
A New Method Designed Crimping Technical Parameter Using Response Surface Methodology
Authors: Fan Li Feng , Gao Ying , Yan Jia Xin , Yun Jian Bin
Published: September 2013

Crimping is widely used in production of large diameter submerged-arc welding pipes. Traditionally, the designers obtain the technical parameters for crimping from experience or trial-errors by experiments. However, it is difficult to obtain the ideal crimping technical parameters with this method immediately at present. To tackle this problem, a new method coupled with response surface methodology and finite element method is proposed to design crimping technical parameters and save the design time of crimping. In this paper, the crimping forming process is simulated by finite element (FE) code ABAQUS. Taking the crimping of X80 steel Φ1219mm×22mm×12000mm welding pipe for instance, the simulation data from the arrangement of simulation which is constituted by the optimal latin hyper-cube sampling approach is treated as sample point. Four types of response surface methodology which included four-order polynomial function, orthogonal polynomial function, kriging and radial basis function is discussed, where the response surface model based on radial basis function is proved more efficient than other types of response surface methodology to construct surrogate model. The results showed a good agreement by a comparison with simulation results and remarkably predicted the crimping quality. Thus, the presented method of this research provides an effective path to design crimping parameters.
Utilization of Phosphorus Slag and Fly Ash for the Preparation of Ready-Mixed Mortar
Authors: Liu Xiu Wei , Yang Lin , Zhang Bin
Published: September 2013

Phosphorous slag and fly ash were used as raw materials for the preparation of ready-mixed mortar, and a series of technological parameters, such as phosphorus slag content, fly ash content, and chemical activators were investigated based on the compressive strength and setting time of specimens in this paper and the performances of products were also tested. The results showed that the optimal mix proportion for preparing ready-mixed mortar (M10) is as follows: cement 5%, phosphorous slag 10%, fly ash 10%, sand 75%, water reducer 1% and chemical activator 1%. The consistency, water retaining, setting time, 28d compressive strength, 14d bond strength and 28d shrinkage meet the requirement of Chinese standard GB/T 25181-2010.