bluuebunny/crossref_metadata_2025 huggingface dataset:
Improvement and Application Technology of Long Bedding Borehole Rig in Rockburst Seam at Headentry and Tailentry
Authors: Chen Jia Sheng , Wei Dong , Deng Hai Shun
Published: October 2014

Advantages, disadvantages, and drilling adaptability of several rigs earlier used in domestic coal mine are analyzed. CMS1-800/30 crawler jumbo is reconstructed from standing pillar rig according to specific condition of long bedding borehole at coal face which possesses rockburst trend. Wide blade spiral drill pipe and Φ65mm diamond compact bit are used to drill long bedding borehole at headentry and tailentry. Drilling efficiency of long bedding borehole is greatly improved, and effect of relieving stress is very good. Safe and quick mining is ensured, and economic benefit is remarkable.
Analysis of Buckling Stability of Deep and Long Foundation Pile
Authors: Li Yun Zhang , Wang Jia Ding
Published: October 2014

Based on the differential equation for buckling of deep and long foundation pile, considering the effects of side friction of pile, foundation soil horizontal tension and pile weight. Then the equation is solved by Galerkin Method, the buckling critical load and effective length equation of deep and long pile foundation is deduced. At the same time, the main parameters’ effect to pile buckling stability is analyzed. At last, a practical example is presented, and the calculated result is compared and proved to be feasible.
Innovation Design of Elevator for Continuous and Discrete Buildings
Authors: Chen Ji Wen , Yang Hong Juan , Yu Fu Sheng , Zhang Han
Published: October 2014

The traditional elevator can only achieve vertical transportation task in the elevator shaft and can not achieve horizontal movement, which leads to that the elevator can not achieve horizontal transportation tasks in buildings. In order to further improve convenience and comfort of elevator transport, the new structure and operation mode of elevator are studied in this paper. Firstly, two types of building are defined: continuous type and discrete type. Then, based on the classification of building type, the structure and operation mode of elevator with function of vertical and horizontal travel are studied. In order to realize the horizontal movement of elevator for continuous buildings, horizontal motion of whole elevator or horizontal motion of car alone can be adopted. For buildings of discrete type, the feasible scheme is to separately drive the car horizontally run to realize the horizontal travel of elevator. The innovation design of elevator will have some help in the design and study of new elevator.
Study on the Active Excitation of Gangue as Grouting Material
Authors: Liu Yong Zhou , Gao Ke , Zhang Hao Jie , Zhu Hui Qiang
Published: October 2014

In this paper, three methods are adopted to excite the activation of gangue: low temperature calcination, milling, and chemistry compound. Using orthogonal design experimental method makes sure the optimum formulation of gangue-lime-sulfate basic system. The study of cement-gangue grouting material shows that mechanical properties and working performance are significantly improved. Significance of widespread use in the future is positive.
Analysis on the Shear Stress Distribution of Internal Anchorage Section of Full-Length Injected Bolt
Authors: Fan Jun Qi , Dong Hong Xiao , Ran Li , Kong Fu Li
Published: October 2014

Based on Mindlin displacement solution and Winkler’s assumption, the stress distribution formula of the internal anchorage section of full-length Injected bolt are deduced. The transmission law, attenuating characteristic of the shear stress are studied and then compared with the results from the test. It indicates that these two analytic solutions are agreed with the results from the test in the main. A reference principle for the analysis of the shear stress on the first and second interfaces of the anchorage section through model tests is provided.
The Stack Soil Management for Construction Site
Authors: Yao Tian Ju , Liu Lin Xin
Published: October 2014

The topography, hydrogeological condition and engineering geological condition of various regions are complicated in China. The demolition and site preparation of mountains construction site generally need to do a large number of excavation and embankment fill, need to consider the problem such as landslide and slope, temporary earthwork stack. The available soil temporary stack involving the question such as safety, environmental protection, etc, with two instances to illustrate should according to quality, safety and environmental protection objectives for construction management of temporary pile soil.
Structure Optimization on FEM Biomechanical Model of Bioabsorable Pure Magnesium Skin Staple
Authors: Lao Yong Hua , Huang Yue Shan , Li Wei Rong , Wang Ying Jun
Published: October 2014

Skin Stapler is an alternative instrument, which makes surgy easily and quickly and owns fine-looking effect without scars after the wound healed, to traditional surgical suture for the wound skin sewing. Magnesium recently is considered to develop medical implants because of its beneficial biocompatibility and bioabsorability. Due its less mechanical strength than traditional 316L stainless steel used in common staple, this paper try to optimize the structure of pure magnesium skin staple by FEM models and simulation as so to assure its biomechanical safty. Using ADINA software, two staples with different pre-bended shoulders and the traditional staple without shoulder are modeling to analyze its stress and plastical strain during structural deformation under load. The results, not only of pure magnesium models but also of 316L stainless steel models, showed that the shoulders optimization on staple structure has important role in its mechanical performance. The research increases the possibility of bioabsorable magnesium material application on medical skin staple.
Reformation of Motorized Spindle Based on Composites Machining Center
Authors: Zhang Yun , Zhou Chao , He Yi
Published: October 2014

This text passes according to the design of the tool machine reformation spindle, to five axis bridge type compound material machining center motorized spindle design reformation, and design to transfer board, finally success apply to engineering.
Studies on Mechanical Properties and Optimization Model of PI/SiO2 Nanocomposite Based on Materials Studio
Authors: Mo Yu Zhen , Xu Jia Chu
Published: October 2014

The unit cell models of PI/SiO2 nanocomposite was built by Materials Studio. The stiffness matrix and mechanical properties parameters such as Young modulus, shear modulus, bulk modulus and Poisson ratio of the unit cells were achieved after molecular dynamic (MD) optimizations and calculations. The influence factors on the mechanical properties of nanocomposite were analyzed. Finally, the optimization model was achieved.
Electricity Acquisition System Design Based on STM32F103
Authors: Fan Han Bai , Kang Wen Qian , Xian Meng
Published: October 2014

STM32F103 microprocessor as the core, this paper introduces the research design scheme of power acquisition in the smart grid. This design can realize real-time acquisition and analysis of power, has the characteristics of high precision and little error. The power acquisition design program is also used in the chip ATT7022, simplify the design of the circuit. Chip ATT7022 collected can be voltage, current reactive power and power factor and other parameters were calculated. The microprocessor STM32F103 mainly analyze the calculation of the data. If the data is not correct, the microprocessor STM32F103 then control circuit is revised accordingly. Practice shows that the intelligent power acquisition system meet the requirements of the smart grid.
Research on Computer Simulation in Titanium Dioxide Photocatalytic Experiment
Authors: Zhao Xiao Bo
Published: October 2014

experiment is the basis of research on titanium dioxide (TiO2) photocatalysis. However, the proceeding of experiment need consume large amount of time, finance and vigor. Computer simulation realizes the mutual effect with outside by system of computer simulating authentic material, which can reduce unnecessary consumption. Computer simulation application provides new tool for TiO2 catalytic experiment and improve the efficiency. This paper summarized the basic structure of TiO2 as well as the mechanism and process of photocatalysis, introduced the main method and relative software of theoretical simulation mathematics, and summarized the advantage of computer simulation in micro field based on the limitation of experiment.
A Novel Circuit Design of the Wideband VGA in CMOS
Authors: Liu Yu Yang
Published: October 2014

In this paper, a wideband variable-gain amplifier (VGA) in CMOS for ultra wideband (UWB) system is designed. The operation frequency of the VGA is 4.2-4.8GHz, and the gain is continuously adjustable between 0 and 30dB. Cascaded Cherry-Hooper with two stages is adopted as the core unit of the VGA, and a temperature compensation circuit is used to reduce the effect of temperature on the performance of the system. The simulation shows that the temperature compensation circuit can compensate the effect of the temperature very well, and the noise figure of the wideband VGA can meet the requirements of the system.
An Encoder Used in an Ultra High-Speed Folding and Interpolating ADC
Authors: Gao Yu Han , Li Ru Zhang , Fu Dong Bing , Wang Yong Lu , Zhang Zheng Ping
Published: October 2014

High speed encoder is the key element of high speed analog-to-digital converter (ADC). Therefor the type of encoder, the type of code, bubble error suppression and bit synchronization must be taken into careful consideration especially for folding and interpolating ADC. To reduce the bubble error which may resulted from the circuit niose, comparator metastability and other interference, the output of quantizer is first encoded with gray code and then converted to binary code. This high speed encoder is verified in the whole time-interleaved ADC with 0.18 Bi-CMOS technology, the whole ADC can achieve a SNR of 45 dB at the sampling rate of 5GHz and input frequency of 495MHz, meanwhile a bit error rate (BER) of less than 10-16 is ensured by this design.
C++ Builder and Inter Base Based Design and Realization of Intelligent Monitoring Control System of HV Static Reactive Compensator
Authors: Yu Xin , Niu Tao , Han Li Peng , Liu Jian Hao , Wang Jian , Deng Xiao Lin , Wang Shu Han
Published: October 2014

SVC is a dynamic reactive compensator based on switching type HV electrical and electronic devices, well recognized as an effective means of resolving power quality problems. SVC is complex in structure, consisting of TCR valve sets, FC filter channel, etc. In particular, TCR valve set adopts thyristor serial connecting technology, and over 100 thyristors are adopted, which requires real-time status of devices in SVC to be monitored and uploaded, and even failures to be recorded. Therefore, the monitoring software becomes an important part in ensuring SVC safe operation. Combined with actual cases, this paper introduces a technology of using C++ Builder and Inter Base to design the static reactive compensator monitoring software. The user interface is elegant, with short development period, highly transplantable, and easily modified.
Multilevel Control System of the Power Grid
Authors: Shevchenko V.A. , Pshikhopov V.K. , Medvedev M.Y.
Published: October 2014

In paper considers the principle of the control system power grid in the form of multilevel system consisting of a system of planning and allocation of management tasks, control system of the segments the grid, the local management system of elements of the grid. The paper shows the principle of operation of the upper and lower levels of the system, an example of a calculation for a segment of the grid, for which the system provides a balance of power capacities.
Research and Prospect of Offshore Wind Power
Authors: Li Ya Wei
Published: October 2014

In view of the existing onshore wind developments, this paper points out the problem in the development process, and thus leads to the development direction of offshore wind in China. the European advanced offshore wind power development status is recalled, and China's offshore wind power started developments are expounded. The key technologies of offshore wind power are presented. The problems of Chinese offshore wind power development are analyzed. Finally, the future of Chinese offshore wind power is prospected.
Study on Characteristics of Partial Discharge in XLPE Cable under Damped AC Voltage at Different Frequencies
Authors: Yu Pei Xiang , Zhang Long , Li Rui Peng , Yang Yu Qi , Li Hong Jie
Published: October 2014

Damped AC (DAC) voltage method is widely used in partial discharge (PD) detection of power cable. The frequency of DAC voltage is changed due to different length of testing cable. To study the PD characteristics in the heat-shrinkable cable accessories under DAC voltage at different frequencies, four different cases of artificial defects in cross-linked polyethylene (XLPE) cables were investigated. These defects include termination without stress tube, incorrect use of insulation tape as the semi-conductive adhesive tape in the middle joint, void and metal particles on the surface of XLPE insulation. Furthermore, some characteristic PD parameters including the partial discharge inception voltage (PDIV), the partial discharge extinction voltage (PDEV), discharge magnitude, discharge times and so on were compared and analyzed. The results show that PD characteristics are different as the DAC frequency changes, which provides guidance for the practical application.
Reliability Analysis of Mobile Phones’ Acoustic Dust-Proof Mesh against Contaminated Environment
Authors: Lv Yang , Xu Liang Jun , Kong Zhi Gang , Zhang Li
Published: October 2014

Dust particles and organic contaminants in environment can intrude into electronic device interior through the shell and opening holes. The intrusive contaminants can adhere on electric contact interface. Therefore, it can reduce components’ electric connection reliability. Widely it used acoustic dust-proof mesh to protect the mobile phone and other electric devices’ earpieces and speakers from contamination intrusion. This preventing contamination role makes much dust particles and organics adhere on the mesh. It is necessary to evaluate dust-proof mesh ability against contamination. In this paper, actual field contaminated meshes have been taken failure analysis. Then, lab simulation experiments have been established with considering meshes and contaminants’ characters. Finally the influence of mesh’s parameter on contamination has been researched.
A Novel Approach on Proton Exchange Membrane Free Direct Formic Acid Self-Electrolyte Fuel Cell
Authors: Sun Shi Mei , Liu Wei
Published: October 2014

A novel approach was performed to eliminate the expensive proton exchange membrane (PEM) from the direct formic acid fuel cell (DFAFC). In the new designed PEM-free direct formic acid self-electrolyte fuel cell (SEFC), formic acid performed the functions of both fuel and ion conductor because of it can be ionized in the aqueous solution. Porous PTFE film was used as the separator in the SEFC to isolate the electron transport inside the fuel cell. This acidic SEFC utilizing Pt as anodic/cathodic catalysts can achieve a power density greater than 1.0 mW cm–2, which was about 1/5 of that of a traditionally PEM-equipped DFAFC with the same catalysts, after the optimization of thickness and porosity of the porous PTFE film.
Simulation on the Cooling Effect of Proton Exchange Membrane Fuel Cell
Authors: Sun Shi Mei , Liu Wei
Published: October 2014

The cooling of proton exchange membranes fuel cell (PEMFC) is one of the crucial components in the heat management of a fuel cell. This paper presents three cooling channels of PEMFC: linear, serpentine and heat pipe. The cooling geometric models are proposed for the three cooling channels, respectively, and the corresponding temperature distributed diagrams are derived under steady state by SINDA/FLUINT. From the simulation, the linear cooling channel of PEMFC renders local overheating inside the cell under the same conditions, obviously. It is also observed that the serpentine cooling channel ensures the uniformity of cell temperature, whereas the change of channel diameter is not able to adjust the radiating performance effectively. Extensive simulation results show that the heat pipe cooling channel not only outperforms the other cooling channels in radiating performance, but also provides a remarkable environmental factor.
Research on Mechanical Structure of the Multi-Function Nursing Bed Robot
Authors: Ma Xi Pei , Qian Bing Feng , Zhang Huan Huan , Zhang Song Jie
Published: October 2014

The bed body of a nursing bed robot employs robotic multiple freedom structure and is controlled by multi-axis coordinating. It can assist to turn over the body, position adjustment and defecating by controls of many modes such as push-button, speech recognition and nursing robot’s remote operation. The collaborative work of nursing robot and nursing bed robot provide the possibility for the home unmanned nursing in the future.
Research Progress on Finite Element Analysis Methods for Bonded Joints at Different Strain Rates
Authors: Jia Zhe Min , Yuan Guo Qing , Hui David
Published: October 2014

Adhesive bonding is one of the effective ways to reduce the weight of structures. Researchers have done lots of numerical analysis and finite element analysis taking into account of the complex stress state in the bonded area, as well as the stress singularity occurs at the overlap edges with a view to efficiently predict the strength and rigidity of adhesively bonded joints. As they may suffer shock or impact loads in practice which leads to high strain rate in structures, analysis methods for adhesively bonded joints differ from that at quasi-static condition for two reasons: one is the mechanical properties of materials, including adhesives and substrates are different at high strain rates, the other is the additional consideration of elastic wave propagation in solid body. This article summaries several finite element analysis methods for adhesively bonded joints at high strain rate developed by domestic and foreign scholars and corresponding experimental standards for determining required parameters of each analytical method and raised some questions that need for further study.
Analysis & Control of the Tension and Elongation of Warp in Sizing Process
Authors: Tong Yun
Published: October 2014

Tension and elongation of warp is the key factors among various technical parameters in warp sizing process in textile production. Analysis of composition of tension & elongation in different zone on sizing machine.By means of mechanical device and electric sensor, as well as frequency conversion speed regulator controlled by PLC, the sizing warp tension &elongation has been regulated precisely. The principles and features of various sensors and their application on modern sizing machine regarding automation have been discussed in this paper.
Intelligent Control of Technique by Means of Capacitive Sensors on Automatic Winder
Authors: Tong Yun
Published: October 2014

Concerning the intelligent control of technique parameters in weaving preparation process known as automatic winder in textile production, the yarn tension, yarn defects, running speed and acceleration are key technique parameters which should be carefully monitored and controlled. The linear and rotating speed will definitely affect the dynamic tension of warp yarn during the winding process. The acceleration of the tension device on automatic winder and tension roller will affect the swing speed and amplitude, eventually influence the value and abirritation of dynamic tension. The capacitive transducer is used to detect yarn defects for improvement of yarn quality, in addition such sensor is qualified to monitor the acceleration of dynamic tension regulator. The principle and designation as well as application of relevant sensor has been discussed in this paper in detail.
The Analysis of DTG Residual Stress and Research of Accelerated Stability Test Profile
Authors: Liang Yuan , Meng Yu Ci
Published: October 2014

In the process of production and processing of Dynamically Tuned Gyro, this paper analyzes the situation that the current accelerated stability test cannot be able to eliminate the residual stress fully which will causes drifting parameter varying of DTG based on FMMEA. The result shows that the residual stress is the important factor of DTG poor reliability. Here the new accelerated stability test profile was designed and verified in the test which eliminated the residual stress effectively. The research method and results has theoretical significance and practical value in making DTG reliability growth.
Dynamic Intelligent Optimization Method of a Profiling Roll Forming Machine
Authors: Huang Ai Fang , Li Qiang
Published: October 2014

Profiling roll forming machine based on the theory of cold roll forming is a new equipment for sheet forming. A dynamic optimal design process for this machine can improve the operational reliability and dynamic response characters of its mechanical systems. Dynamic intelligent optimization method which is developing is very suitable to settle the problems of dynamic optimization for mechanical systems, and its application fields should be vigorously promoted. On account of the Particle Swarm Optimization has the advantages of easy understanding, easy realization and strong capability of global search, this paper decides to adopt the Particle Swarm Optimization combined with dynamic design. The method applied to mechanical systems of profiling roll forming machine is successful to optimize some relative parameters and improve the dynamic performance of the system.
Effect of TiC Content on the Microstructure and Wear Resistance of (Cu/50W)-TiC Composite Prepared by Spark Plasma Sintering
Authors: Yin Ting , Tian Bao Hong , Zhang Yi , Liu Yong
Published: October 2014

The four different contents of (Cu/50W)- TiC composites were prepared by spark plasma sintering method. The density, relative density, micro-hardness and conductivity were determined, respectively. The microstructure of the composite was analyzed by SEM. The wear resistance was investigated by a QG-700 atmosphere and high temperature friction and wear tester. The results show that, when the content of TiC is 3%, the optimum comprehensive properties of the (Cu/50W)-3TiC composite are obtained. The density, micuo-hardness and conductivity of the composites are 98.7%, 113HV10 and 61.4%IACS, respectively. The wear mechanisms of the (Cu/50W)- TiC composites are mainly of micro-cutting wear and adhesive wear.
Stability and Microstructure Characterization of Barrierless Cu (Sn, C) Films
Authors: Li Xiao Na , Jin Lu Jie , Zhao Li Rong , Dong Chuang
Published: October 2014

Thermal stability, adhesion and electronic resistivity of the Cu alloy films with diffusion barrier elements (large atom Sn and small atom C) have been studied. Ternary Cu (0.6 at.% Sn, 2 at.% C) films were prepared by magnetron co-sputtering in this work. The microstructure and resistivity analysis on the films showed that the Cu (0.6 at.% Sn, 2 at.% C) film had better adhesion with the substrate and lower resistivity (2.8 μΩ·cm, after annealing at 600 °C for 1 h). Therefore, the doping of carbon atoms makes less effect to the resistivity by decreasing the amount of the doped large atoms, which results in the decreasing of the whole resistivity of the barrierless structure. After annealing, the doped elements in the film diffused to the interface to form self-passivated amorphous layer, which could further hinder the diffusion between Cu and Si. So thus ternary Cu (0.6 at.% Sn, 2 at.% C) film had better diffusion barrier effect. Co-doping of large atoms and small atoms in the Cu film is a promising way to improve the barrierless structure.
Study on Preparation and Application of High Performance Complex Alloy Coating Material Covering Plastic Matrix
Authors: Li Mei Mei
Published: October 2014

Further improvement was conducted on the technology of chemical copper plating on the surface of the plastic matrix according to the requirements of plant. Multiple factors were researched on Ni-Co-P alloy electroplating technology. The optimum technology to electroplating Ni-Co-P alloy on plastic matrix was founded through orthogonal design test. The time of electroplating process is short. The coating is smooth, fine and bright. It was show through determination that the combination is strong between coating and matrix and the content of phosphorus is 8.1%.The coating is amorphous alloy .The corrosion resistance and abrasive resistance of the coating are fine. The coating has magnetism and very good decorative.
Study on the Effect of Sodium Polyacrylate and its Compounds on Artificial Warm Fog Dissipation
Authors: Song Ting Lu , Xing Xiao Hui , Yang Yong , Li Xiao Dong , Yang Rong Jie
Published: October 2014

Sodium polyacrylate as a kind of high absorbent resin, has an excellent water absorption performance, is low in price and isn’t corrosive. Compounds of different particle sizes and components were prepared using sodium polyacrylate and sodium chloride. They were used in the fog chamber to disperse warm fog respectively then. Experiments were carried out to investigate how particle size and composition affect the warm fog dissipation. Results as follows are obtained: the time light transmittance recovers to 60% (t60%) is 85min when the fog dissipates naturally; 30g sodium polyacrylate whose average size is 30μm has a good effect on warm fog dissipation, t60% being 14min; when the sodium polyacrylate and sodium chloride are mixed by 1:2 in mass ratio, the fog elimination effect is the best, with t60% 6min. The reasons are analyzed at the same time.
Study on Demolding of Net Shape Formed SB/CF-EP Lining Products
Authors: Sun You Song , Zhang Qiang , Zhang Peng , Cheng Yong Qi , Zhou Xian Hui
Published: October 2014

For the net shape forming of composite products with structure of SB/CF-EP (steel backing/carbon fabric reinforced epoxy) lining, the demolding is difficult. Aiming to net shape forming of transmission screw nuts with structure of SB/CF-EP, a new solution was proposed in which the high-strength casting wax was used as the release agent. A basic demolding experiment was designed and comparative demolding experiments were conducted for three different conditions: wax and grease as release agents and no agent. The influences of different agents and agent thickness on demolding force, product sizes and surface quality were studied. In comparison with grease and no release agent the demolding force for wax was reduced by 91.6% and 98.0% respectively. The product shrink could be compensated by controlling the wax thickness. By using wax release agent, the fabrication of transmission screw nuts with SB/CF-EP lining was successfully completed.
Safe and Eco-Friendly Haze-Eliminating Pavement Coating
Authors: Zhang Jiu Peng , Wang Yun Hang , Li Na , Duan Zhi Jun , He Lei , Zhao Yu Hang
Published: October 2014

The main purpose of the pavement coating is to reduce the haze by absorbing and degrading pm2.5 from automobile exhaust. Based on the investigation and analysis of the source and main composition of haze and pm2.5 and the physical and chemical properties of haze, the paper proposes the method of combining the absorption and catalytic degradation of active Al2O3 and nanometer TiO2 together. Through the experiments, the pavement coating which has the different ratio of active Al2O3 and nanometer TiO2 behaves differently on the effect of absorption and degradation of pm2.5, and the optimum dosage and ratio of active Al2O3 and nanometer TiO2 was found finally. The pavement coating which use the optimum dosage has the more obvious effect under the ultraviolet. And the water resistance and skid resistance performance can also meet the requirements.
Application Status Analysis of Biomass Ash in Cement Concrete
Authors: Zhou Shu Guang , Chen Xin Xiao , Liu Zhao
Published: October 2014

Aims to application status of biomass ash, basis on physical property, chemical property, mineral phase, element, application status analysis of biomass ash in cement concrete is studied, the result indicate that the reason that biomass ash which the component is similar to fly ash can not be applicated widespreadly in cement concrete is there is no corresponding application standard, no fixed classification and the chemical action mechanism is not determine.
Status of Feedlot Biomass (Cattle Manure) Ash Concrete
Authors: Zhou Shu Guang , Chen Xin Xiao , Yang Yu Peng
Published: October 2014

Feedlot biomass ash (cattle manure ash-CMA) is a waste which comes from dried cattle manure combustion. In recent years, how to reuse the solid waste is becoming a hot issue. There is a large of CMA biomass ash in china every year, which not only occupies farmland and pollute environment but also impact the development of farming and animal husbandry. Therefore, it is necessary to study to reuse CMA biomass ash in concrete to replace concrete. In this paper, status of research of the CMA application in concrete at home and abroad is analyzed, the problems of the present research which exist in application of CMA biomass ash in concrete and how the particle size of CMA influence the performance of concrete when some cement is replaced by CMA is points out. It is necessary to carry out to study how particle size of CMA biomass ash influence on concrete performance.
Static Recrystallization and Texture Evolution of 316L Stainless Steel Fibers
Authors: Yu Hai Ou , Wang Yan , Liu Yong , Tang Hui Ping
Published: October 2014

By isothermal annealing tests, the recrystallization and grain growth behaviors of 316L stainless steel fibers with a diameter of 8 μm were investigated using the optical microscope (OM), scanning electron microscope (SEM) and X-ray texture analysis methods. The average grain size of the fibers with a diameter of 8 μm annealed at different conditions was quantitatively measured. The grain growth equations of the fibers were constructed, and the activation energies for grain growth of the fibers were also determined. Meanwhile, efforts have been paid on analyzing the texture evolution of 316L stainless steel fibers before and after annealing.
The Design Principles of Small-Molecule Fluorescent Probes for the Detection of Anions
Authors: Chu Ran Ran
Published: October 2014

Small-molecule fluorescent probe with advantages of small size, low background and simple preparation have been widely used. The detection of anions by small-molecule fluorescent probes is usually achieved through one of the following reaction mechanisms: hydrogen bonds and electrostatic interactions; metal or Lewis acid coordination; covalent interaction. This article summarizes the advances in the design principles of small-molecule fluorescent probes for the detection of anions in biological and environmental media in recent years.
Deformation Rule of 7150 Aluminum Alloy Thick Plate by Pre-Stress Shot Peen Forming
Authors: Wang Ming Tao , Zeng Yuan Song , Bai Xue Piao , Huang Xia
Published: October 2014

Pre-stress shot peen forming is a metal forming process widely used in aeronautical industry. The test parts of 7150 Al alloy of different thickness were pre-stress shot peen formed. The deformation rule of those parts was investigated by means of changing the peening coverage. The results show that the radius of curvature of the parts will enhance gradually with increasing of the plate’s thickness. In addition, enhancing peening coverage could raise the deformation in the case of that the thickness and peening parameters are unchanged. Furthermore, the minimum radius of curvature of the 8mm plate after saturation pre-stress shot peen forming could reach 499mm.
Study on the Brush Plating Technology of Super-Strength Duralumin
Authors: Zhu Chang Chun , Guo Bi Xin
Published: October 2014

Brush plating has been an important technology for the mending of the scratched surface of the engineering parts in recent years. The process for brush plating mending of deeply scratched surface of the parts made by 7A04 super-duralumin alloy is introduced in this article. The merits of the brush plating mending technology of 7A04 super-duralumin alloy are discussed.
Effect of NiO Doping Order on Properties of 10NiO-NiFe2O4 Composite Ceramics
Authors: He Han Bing
Published: October 2014

The 10NiO-NiFe2O4 composite ceramics doped with NiO were prepared with the cold isostatic pressing-sintering process. The effects of NiO doping order on the density, bending strength and electrical conductivity of NiFe2O4 composite ceramics were studied. The results show that, doping excess 10wt% NiO before synthesis of NiFe2O4 composite (doping order one) and doping excess 10wt% NiO after synthesis of NiFe2O4 composite (doping order two), the former’s samples have a better relative density 88.9% and linear shrinkage rate 9.82%, which is increased by 7.12% and 3.6% compared with that of latter’s samples, respectively. At the same time, the former’s samples also have a better electric conductivity and reach 1.29S/cm at 1233K, which is higher about 13.15% than those latter’s samples. However, the bending strength of the former’s samples just has 76.28Mpa, which is lower about 15.41% than that of the latter’s samples 88.04Mpa.
Study on Dielectric Constant and Absorption Coefficient of Coupled Carbon Nanotube Array
Authors: Yang Kai , Wang Yue Feng , Zhou Quan , Yin Zhi Yong , Bai Hui Jun
Published: October 2014

Infinite single-walled nanotubes are seamless cylinders at the surface of which carbon atoms are organized in a honeycomb lattice. Based on the theory of meal and semiconductor, dielectric constant and absorption coefficient of CNT (12,0) in the direction of parallel to the axis and perpendicular to the axis were calculated by the method of density functional theory. The result showed that CNT performed excellent dielectric and absorption properties in the area of near infrared, visible light, near ultraviolet. Dielectric constant and absorption coefficient were improved as the space decrease between each tube. In terms of its incident direction, CNT was anisotropic medium. Generally, the value of dielectric constant and absorption coefficient parallel to the axis were larger than perpendicular to the axis. The facts impact dielectric constant was analyzed from the geometric structure and electrical structure. The property of absorption was analyzed from the quantum theory, which methods were different based on the alterable structure of CNT, such as intrinsic absorption, excition absorption and free carrier absorption. Complicated facts were worked on the macroscopical dielectric constant and absorption coefficient.
Effect of Ultrasound on Microstructure and Tensile Properties of In Situ TiB2p/7055 Composite Synthesized by Melt Direct Reaction
Authors: Liu Xiao Jun , Zhao Yu Tao , Zhang Song Li , Lin Wei Li
Published: October 2014

TiB2/7055 composite was synthesized by a new melt direct reaction from 7055-(Al-3B)-Ti system with ultrasound. The phase composition and the microstructures of the as-prepared samples were investigated by XRD, SEM and EDS. The result shows that no Al3Ti phase is in existence. With the assistance of ultrasound, grains are significant refined. Moreover, the wettability between matrix and particles is improved. The shapes of TiB2 particles are mainly hexagonal or near-spherical, and the size is about 500nm. TiB2 particles are with uniform distribution. Compared with 7055Al matrix alloy, the tensile strength of the composite reaches 303MPa, increased by 10.2%. However, the elongation is 7.3%, decreased by 4.8%.
Density Functional Theory Study of Lithium Atom Adsorbing in the Interior and Exterior of a Series of Carbon Nanotubes
Authors: Yuan Yan Hong , Yang Jun Wei
Published: October 2014

Density functional theory has been applied to study of adsorption of lithium atom in the interior and exterior of a series of carbon nanotubes. It is found that lithium atom can steadily adsorb in the interior and exterior of carbon nanotube. Lithium atom adsorbs at the center and near the sidewall for interior of carbon nanotube, but lithium atom only adsorbs near the sidewall for exterior of carbon nanotube. The interior of small diameter carbon nanotube is more favorable than larger ones for lithium atom adsorbing. This is because the lithium atom almost locates at the center of small diameter carbon nanotube, leading to strong interaction. Moreover, we also investigate the lithium atom of adsorption distance, Mulliken population and the system of the redistribution of electron density.
Effects of Precursor pH Value and Calcination Temperature on Photocatalytic Properties of Ni-Fe Codoped ZnO Nanoparticles
Authors: Zhang Qin , Zhang Jing Quan , Xu Ming , Zhang Chun Lai , Dong Cheng Jun , Xu Lu Xiang
Published: October 2014

(Ni, Fe)-codoped ZnO powder was synthesized by a sol-gel process, using oxalic acid zinc as the zinc source. Effects of the pH value of the precursor solution and the calcination temperature on the photocatalytic degradation efficiency of (Ni, Fe)-codoped ZnO powder were studied by using methyl orange as the degradation object. The structures, morphology and ingredients were characterized by X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. The results show that all the samples are polycrystalline with a nanocrystal size of about 20~30nm. The methyl orange solution (8 mg/L) was degraded by more than 50% in 12 hours under the irradiation of natural light in the presence of the (Fe, Ni)-codoped ZnO sample synthesized under these conditions: the doping concentrations of both Ni, Fe are 1%, the pH of the precursor solution is 7.5, and the calcination temperature is 375°C. The photocatalytic degradation mechanism of (Ni, Fe)-codoped ZnO powder is discussed qualitatively, based on the microstructure analysis.
Mechanism towards Fluorescence of CdTe Quantum Dots Quenched by Magnetic Iron Oxide Nanoparticles
Authors: Liu Xing Hui , Yang Xiao Ming
Published: October 2014

In this study, fluorescence spectrum and UV-vis absorption spectrum were employed to explore the interactions between magnetic iron oxide nanoparticles modified by citric acid (CA-MION) and CdTe quantum dots modified by thioglycolic acid (TGA-CdTe QDs). Significantly, the mechanism was demonstrated as a dynamic quenching process based on energy transfer. Taken together, these results showed the decreased fluorescence intensity of CdTe QDs implied satisfactory linear relationship with various concentrations of CA-MION ranged from 0.15×10-3 mol·L-1 to 4.5×10-3 mol·L-1. Overall, this study has provided the potential for preparing multimagnetic-fluorescent nanocomposites and further developing quantitative detections of multi-analytes.
Study the Removal of Sulfide in MTBE Base on the Attapulgite Desulfurizer
Authors: Li Shun De , Ye Ye Tong , Li Lan , Wei Guo Yu , Wang Qing Ning
Published: October 2014

A novel desulfurizer was prepared to remove the sulfide in MTBE. The performance of the desulfurizer was investigated by L18(2×37) Orthogonal Test. The desulfurizer for MTBE was prepared by the impregnating technique, in which the transitional metal Fe series and Ag series compounds were used as active components, and the modified attapulgite clay as the carrier. In order to get the optimum conditions to desulfurization in MTBE, IR, XRD, TEM, XPS technology were used to study the desulfurization mechanism. Compare the desulfurization characterize before and after the experiment. The result shows that the desulfurizer made by 8% Fe series compound and 2% Ag series compound, and roasted at 300°C for 3 hours. The Sulfur content in MTBE was reduced from 789mg/kg to 124mg/kg. The desulfurization rate was reached to 84.18% (in normal temperature and pressure.). The removal effect is obvious. The result of this study can be applied for Removal sulfide in MTBE.
Review of Friction and Wear Resistance Properties of Modified PEEK Composites
Authors: Gao Xiao Min , Liu Ji Wei , Liu Yong Hua
Published: October 2014

The characteristics, structure and applications of polyetheretherketone (PEEK) composites are introduced briefly. The research progress of friction and wear resistance properties of PEEK composites, modified by carbon fiber, other nanometer and micro-particles, are summarized. Suggestions for further research are put forward.
Influence of Sputtering Power on Structural and Optical Properties of ZnO Films Fabricated by RF Magnetron Sputtering
Authors: Zhou Yang , Zheng Hong Fang , Zhao Guang , Li Man , Liu Bao Ting
Published: October 2014

ZnO thin film has been fabricated on sapphire substrate (0001) using RF magnetron sputtering at room temperature. The influence of sputtering power ranging from 10 W to 70 W on the microstructural and optical properties of ZnO films is investigated by atomic force microscopy (AFM), X-ray diffraction (XRD), ultraviolet-visible spectrophotometer. The AFM results show that with the increase of sputtering power, the size of ZnO crystalline increases first, then decrease and the maximum grain size occurs at 50 W. The XRD measurements indicate that the ZnO films with wurtzite structure are highly c-axis orientation and the film fabricated at 50 W has the best crystalline quality. Optical transmission spectra of the ZnO samples demonstrate that the ZnO film obtained at 50 W has the higher average transmission (above 90%) in the visible-light region and its optical band gap is 3.26 eV.
Effect of Electro Deposition Parameters on Thickness and Fe Contents of Nickel-Iron Foam Alloys
Authors: Huo Xiao Min , He Gang , Lin Hong Yun , Wang Jian Li , Wang De Qing
Published: October 2014

An Ni-Fe alloy on the surface of nickel foam was prepared by electro deposition. The effects of technological parameters including current density, pH value, temperature and the ratio of [Ni2+] to [Fe2+] of planting solution on the thickness and iron content of the alloy coating were studied. The cross-section microstructure and surface morphologies were observed by optical microscopy and scanning electron microscope, and the compositions of the alloy coating were analyzed by energy dispersive spectrometer and ICP-AES. Experiment results show that the thickness of the alloy coating is increased with increasing current density, temperature, pH value and the ratio of [Ni2+] to [Fe2+] of the planting solution. The Fe contents of the alloy coating is increased with increasing current density and pH value of the planting solution, and decreased with increasing temperature and the ratio of [Ni2+] to [Fe2+] of the planting solution. A 36.2 μm thick alloy layer of uniform and dense coating with the Fe content of 60.5 wt% is obtained under the parameters ofn(Ni2+)/n(Fe2+)= 4, current density = 10 A/dm2and pH = 4.2 at 50 °C for one hour.
Synthesis and Characterization of Chrom-Free Zr-Ti-Ni Pale Green Coating on AA6063 Aluminium Alloy
Authors: Chen Ting Yi , Lu Wen , Fu Ye Qi , Li Wen Fang
Published: October 2014

With K2ZrF6as the main film-forming material, Ni2SO4• 6 H2O as colorants, K2TiF6for coloring promoters, chrome-free conversion and treatment for Al6063 at room temperature has been developed, fluid can be of steady function without adding oxidants additionally, fast film forming within 6 minutes. By adding Ni element to make the conversion coating changed from gray to pale green, K2TiF6can promote color and uniform color. Analyzed sample through SEM observation, XPS and XRD analysis, the passivation was composed of Al, Ni, NiZr, Ti and NiZr3; By electrochemical tests, the corrosion current decreased to 0.067μA of passivation membrane, corrosion resistance increased nearly one hundred times, membrane layer structure circuit is C1 / R1 / (L2 + R2)/(L3 + R3)/(L4 + R4).
Preparation and In Vitro Release Study of Quaternized Chitosan Nanoparticles
Authors: Wen Yan , Zhang Xiao Yang , Sheng Li , Lian Xi Jun
Published: October 2014

In order to exploit a novel drug carrier for 5-fluorocrai (5-Fu) with improved entrapment efficiency (EE) and loading capacity (LC) determined by UV/Vis spectrophotometer, N-[(2-hydroxy-3-trimethylammonium) propyl] chitosan chloride (HTCC) nanoparticles were prepared via the ionic gelation based on the electrostatic interactions between positively charged HTCC and negatively charged sodium tripolyphosphate (TPP). The in vitro release behavior of 5-Fu molecules encapsulated within HTCC nanoparticles took a controlled manner in PBS buffer solution (pH 7.4), initiating from a rapid release within 2 hours following a slower sustained release. A higher substitution degree of quaternary ammonium group (DQ) along HTCC chain generated a stronger electrostatic interaction between positively charged HTCC and negatively charged 5-Fu as a result of a higher positively charge density, and contributed to the controlled release of 5-Fu from HTCC nonaparticles. The formation mechanism of HTCC nanoparticles and 5-Fu-loaded HTCC nanoparticles was probed based on the results of fourier transforms infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and size and zeta potential analysis.
Study on Performance of Sulfur Modified Asphalt
Authors: Wang Can , Xu Xue Song , Ma Quan Hong , Chen Hong Cui
Published: October 2014

The study on the property of modified asphalt was based on sulfur modified asphalt,s environmental protection and microscopic analysis . The spectrophotometric,s method of methylene blue was adopted for testing release quantity because of the process of reaction producing hydrogen sulfide (H2S) gas between sulfur modifier agent and asphalt, the results showed that gas release quantity of environmental pollution were small which had good environmental protection performance; The analysis of SEM found modifier agent can be evenly dispersed in asphalt; The method of asphalt four components was used to study the compatibility of sulfur modified agent for asphalt, Modifier can absorb part of saturates and aromatics, however, colloid and asphaltene had no absorption; DSC showed that saturates and aromatics can be easy to react with modifier because their poor stability, while colloid and asphaltene were on the contrary.
The International Research Progress of GaN-Based Microwave Electronic Devices
Authors: Wang Li , Feng Chun
Published: October 2014

The international research progress of GaN-based high frequency, high power microwave electronic device is introduced. The latest developments in high efficiency and millimeter wave devices are especially described.
Analysis of Powder Samples Extracted from Concrete Structures of Nuclear Plant
Authors: Zatloukal Jan , Bezdička Petr
Published: October 2014

The civil structures of nuclear plants need to meet the most strict criteria in terms of safety and reliability not only during their design and construction, but during the duration of their life cycle. Regarding the specifics of nuclear plant operation the inspections of the said structures need to be fully non-destructive and visual inspection is the method mostly used. In rare occasions it is possible to obtain a material sample in the form of drilled powder or small diameter core. In this paper, an example of analysis of such material sample is given, showing the amount of information describing the structural material that can be obtained using state-of-the art analytical methods – X-ray diffraction (XRD), X-ray fluorescence (XRF) and thermic analysis (TG/DTA). The paper shows results for regular structural concrete and special concrete with enhanced capability of shielding ionizing radiation.