bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Machining Method of Spatial Rotary Curved Surface
Authors: Shen Xiao Long , Li Mei Lin , Long Hua , Zhang Lai Xi
Published: July 2013

In order to get high tapered spatial complicated curved surface parts and solve the difficult problems of machining spatial curved surface parts in high-speed wire cut electronic discharge machining (WEDM), a turnover NC rotary table based on the mathematical models of spatial complicated curved surface was designed. Through establishing the mathematical equations of the general motion form, the several major processed forms are obtained. Then the multi-axis movement WEDM system and its experimental device were established. Through machining experiment of the several major processed forms, it shows that the multi-axis movement WEDM system has high machining quality and low cost and has practical applicability, to confirm the feasibility of the polar coordinates processing system in space ruled surface, and to produce a novel research direction for solving the difficult problems of machining spatial curved surface parts.
Trends of MEMS-Based Vibration Energy Harvester
Authors: Mo Bing , Huang Rong Hai , Huang Rui Min , Ling Chao Dong , Zhou Huo
Published: July 2013

Micro vibration energy harvesters have received much attention due to their potential application of low power wireless sensor networks and embedded systems. This paper studies three mechanisms to scavenge the ambient vibration energy, discusses the power management circuit and the application of the converter, investigates the prospective development and ongoing challenges in MEMS-based vibration energy harvester.
Ultrahigh-Resolution MEMS Humidity Sensing Elements Based on Film Bulk Acoustic Wave Resonators
Authors: Zhao Hong Yuan , Zhang Dai Hua , Pang Wei , Zhang Hao
Published: July 2013

A high-resolution humidity sensor based on MEMS FBAR with spin-coated PVA thin film is reported. The sensors exhibit very high sensitivity to water vapor and are able to detect down to 0.08 % change in relative humidity by monitoring the shift in series resonant frequency of the FBARs. The integration of these devices with CMOS oscillating circuits and RF front-end chips will create great potential of FBAR based mass sensors in a wide variety of applications in chemical and biological sensing.
Ultrasonic Energy Characteristics of ZnO Piezoelectric Thin Films Array Based on MEMS
Authors: Wu Shao Hua , Gao Zhong Hua , Zhao Zhan , Xiao Li , Xuan Yun Dong
Published: July 2013

The characteristics of the ultrasonic energy transference system with MEMS ZnO square piezoelectric thin films array (SPTFA) structure has been investigated in the article. Design principle of the system has been introduced, and the ultrasonic directivity has been enhanced by the films array structure. The silicon panel with the SPTFA structure has been successfully fabricated based on MEMS technology. The ultrasonic energy transference experiment has been carried out as well in order to check the capability of the system by means of two SPTFA panel. Experiment results show that the maximum power density is 2.581mW/cm2 when the amplitude of exciting voltage is 10V, and the light emitting diode is lightened successfully by the system in a distance of 3mm.
Fabrication and Characteristics of the Nano-Polysilicon Thin Film Transistors
Authors: Zhao Xiao Feng , Wen Dian Zhong , Zhuang Cui Cui , Han Bing , Li Yue , Cao Jing Ya , Li Lei
Published: July 2013

In this paper, we report the fabrication and characteristics of the top-gated thin film transistors (TFTs) with nanopolysilicon as active layers. The nanopolysilicon thin films were deposited on SiO2 layers by LPCVD and the SiO2 layers were grown on the single silicon substrates. Then the nanopolysilicon thin film transistors with different thin film thicknesses and different channel width length radios were fabricated by CMOS technology, in which the thicknesses of channel layers were 90nm and 120nm, and the channel width length radios were 160μm/160μm, 320μm/160μm and 640μm/160μm, respectively. The experiment results show that drain current is in proportion to channel width length radio. In addition, when the thickness of the nanopolysilicon thin film is 90nm and the channel width length radio is 640μm/160μm, the on/off current radio reaches 106.
Electrochemical Measurement of Copper, Lead and Zinc Ions in Tap Water by Using an Environment-Friendly Microelectrode
Authors: Wang Jin Fen , Bian Chao , Tong Jian Hua , Sun Ji Zhou , Xia Shan Hong
Published: July 2013

This paper describes the fabrication, characterization and application of an environment-friendly tin film/gold nanoparticles (Sn/AuNPs) modified gold microelectrode for square wave stripping voltammetric (SWSV) determination of copper, lead and zinc. The microelectrode chips were fabricated by Micro Electro-Mechanical System (MEMS) technique. The sensitivity of the modified microelectrode was largely improved due to the large surface area of AuNPs and the formation of alloys between target metals and Sn. The influence of hydrogen overflow was reduced and the current response was enhanced because AuNPs made the stripping potential shift positively and Sn extended the stripping potential range. Combining AuNPs with Sn, the obtained microelectrode exhibited satisfied linearity ranges from 5 to 500 μg L-1 for copper and lead, from 10 to 500 μg L-1 for zinc, with a limit of detection of 2 μg L-1 for copper, 3 μg L-1 for lead and 5 μg L-1 for zinc. The Sn/AuNPs/gold microelectrode was successfully applied for simultaneous detection of copper, lead and zinc in tap water sample.
Molecular Dynamics Simulation Research in Water Adsorption on Aluminum Surface
Authors: Liang Ying Chun , Wang Quan Long , Chen Jia Xuan , Xie Wen Kun , Sun Ya Zhou
Published: July 2013

In this paper, molecular dynamics method was used in researching the adsorption between single crystal aluminum and water, we built a molecular dynamics model of single crystal aluminum and water, researched the adsorption state of water on the surface of single crystal metal aluminum after nanofabrication, and gained the simulation value of the surface contact angle between aluminum and water. We also studied the impact of different orientations, different surface nanostructures, and different system temperatures on the surface contact angle. The simulation results show that: for single crystal aluminum of [10 crystal plane and water, when happen adsorption, the contact angle is approximately 61.5°, the same with the measured results; and for [11 single crystal aluminum, the contact angle is approximately 70.5 °, so different arrangement of crystal orientation has affect on surface contact angle, but does not change the hydrophilic nature. When the trench depth of the aluminum crystal surface increases, the surface contact angle is gradually increasing; and when the temperature rises, the surface contact angle increases to a certain extent.
Ultra-Precision Turning Technology of Gold Cone in Fast Ignition
Authors: Li Guo , Huang Yan Hua , Tong Wei Chao , Yuan Guang Hui , Tao Yang , Du Kai
Published: July 2013

Fast Ignition (FI) attracts much attention owing to its advantages. The fabrication of fast ignition targets is one of the key technologies in FI study. Based on the single point diamond turning (SPDT) technology, Diamond post-turning method is adopted in this paper for the fabrication of gold cone. It not only helps to reduce the end-effect of cone mandrel and consequently improve the coaxiality of internal and external cone surface, but also helps to improve the quality of cone surface and the wall thickness consistency. Besides, the processing parameter of diamond post-turning is experimentally studied in this paper for its effect on the cone surface roughness. According to results, the cone surface roughness is Ra 9.21nm, the wall thickness consistency is 3μm and the cone end surface roughness is Ra5.72nm。
Finite Element Analysis of Failure in Cu Interconnect Megasonic Cleaning
Authors: Huang Ya Ting , Meng Chun Ling , Wu Nian Peng , Dong Xiu Ping , Lu Xin Chun
Published: July 2013

Megasonic cleaning has been one of the most successful techniques for Cu/low-k interconnects post-CMP cleaning. The structural deformation and stress of Cu and low-k materials in megasonic cleaning are examined with finite element method (FEM). The maximum stress is concentrated in the binding area between Cu and low-k. With decrease of Cu line width, the maximum stress increases and the max value exceeds the yield strength of Cu which results in the plastic deformation. The increasing frequency will change the bubble collision times. Therefore the fatigue is potential. The maximum displacement moves from center to the sides of top surface with increase of line width. When the line width is 25nm, the deformation is the largest.
Research on the Customer Requirement Processing for Mass Customization
Authors: Zhang Yu Hua , He Yi Jing
Published: July 2013

This paper built the customer requirement processing flow for mass customization, and analyzes the customer group’s and discrete customer’s requirement processing flow. On this basis, the acquisition and criterion of customer requirement, the customer requirement information analysis, the evaluation of customer satisfaction(EOCS) has been studied and discussed.
MEMS Relay Optimization Design Algorithm Based on Particle Swarm Optimization
Authors: Liu Han Min , Wu Qing Hua , Yan Xue Song
Published: July 2013

Mathematical model of the MEMS relay volume involves in mechanical, electrical, magnetic, thermal, etc., the MEMS relay optimization design is a constrained nonlinear function optimization problem. In this paper, aim at the disadvantages of standard Particle Swarm Optimization algorithm like being trapped easily into a local optimum, we improves the standard PSO and proposes a new algorithm to solve the overcomes of the standard PSO. The new algorithm keeps not only the fast convergence speed characteristic of PSO, but effectively improves the capability of global searching as well. Experiment results reveal that the proposed algorithm can find better solutions when compared to other heuristic methods and is a powerful optimization algorithm for MEMS relay optimization design.
Influence of Dimension and Temperature on
Capacitive Humidity Sensor
Authors: Yu Hui Jin , Ling Jiao , Shen Hua Qin , Zhou Wu , Peng Bei
Published: July 2013

The influence of dimension and temperature on a MEMS-based capacitive humidity sensor is researched in this paper. Looyenga’s equation and Dubinin’s semi-empirical data are used to describe the change of dielectric constant of sensing film when absorbing or desorbing water. For these equations and data, a picture of the relationship between dielectric constant and temperature, relative humidity is presented. In the basis of this theory, a simulation is finished, a curve showing good linearity and presenting the relationship between capacitance and relative humidity is obtained. A graph showing the influence of temperature on capacitance at different %RH is given, which considers the change of dielectric constant of Looyenga’s equation and Dubinin’s semi-empirical data only. the result shows that the capacitance decreases with the increasing of temperature. Influence of sensing layer thickness on sensitivity is presented. It shows that when the thickness of sensing layer is about 0.6 micron, the model of humidity sensor has the highest sensitivity.
Platinum Resistance Microsensor for Cryogenic Temperature Measurement
Authors: Mei Jia Bing , Liu Jing Quan , Jiang Shui Dong , Yang Bin , Yang Chun Sheng
Published: July 2013

Platinum resistance temperature sensor is applied to the temperature range higher than 200K currently. Through studying the principle of platinum temperature sensor, the platinum resistance temperature microsensor can be used in the temperature region between 10K and 200K was studied. It employs symmetrical turn back structure, which effectively avoids the inductance caused by alternating current (AC). Fabrication process based on MEMS technology was illustrated. The platinum film was obtained by direct current (DC) magnetron sputtering deposition and the platinum resistance temperature microsensor was fabricated with 200nm thickness layer film. The relationship between resistance and temperature of platinum microsensor was tested by Quantum QD PPMS instrument. When T>30K and T<30K, TCR of platinum microsensor could achieve 16490ppm/K and 6430ppm/K respectively. Thus, the microsensor can be used as temperature sensing element between 10K and 200K in the cryogenics.
Development of Data Acquisition System for Micro-Accelerometers’ Dynamic Centrifuge Test
Authors: Gao Yang , Qin Ran , Guan Chen Qiu , Li Mei
Published: July 2013

In order to achieve thedynamic flight environment simulation assessment for the micro-accelerometer usedin the inertial navigation or guidance systems, it is necessary to reform the precisionstatic centrifuge’s mechanical and electronic architecture, accompanied withthe development of the novel data acquisition system. System design, hardwareand software implementation of the DAQ system for the micro-accelerometer’s dynamiccentrifuge test is reported, which is a subsystem of the dynamic precisioncentrifuge, Involving its system architecture, hardware and softwareimplementation. The DAQ system is developed based on the virtual instrument architecture,which has the ability to handle 4 analog or digital output micro-accelerometerssimultaneously. Error analysis shows that when the micro-accelerometer’s outputvoltage signal range is +2.5 V ~-2.5V, the comprehensive measurement accuracyis less than 2.5mV; when the output voltage signal range is +12.5 V ~-12.5V, thecomprehensive measurement accuracy is less than 12.5mV. When the sampling timeinterval is 20ms, synchronization error between each sampling point and thecentrifuge controller is less than 0.1ms.
Tunable Microring Filter Based On-Chip Interrogator for Wavelength-Modulated Optical Sensor
Authors: Yang Jian , Qiu Chen , Wang Qi Long , Wang Ming Hua , Yang Jian Yi
Published: July 2013

We demonstrated a novel approach for the interrogation of wavelength-modulated optical sensors. The interrogator is based on a tunable on-chip microring filter. By tuning the center wavelength of the microring filter, the center wavelength of the sensor can be readout by the corresponding tuning power. This approach has the potential of constructing a compact and cost-effective interrogator with good performance.
Liquid-Suspended Rotor Gyroscope Multiphase Driving Technology
Authors: Weng Rui , Liu Xiao Wei , Zhang Hai Feng
Published: July 2013

Liquid-suspended rotor micro-mechanical gyroscope uses a high-speed rotating hollow rotor in response to the density of the liquid as the mass to do the angular velocity detection. In order to improve the liquid-suspended gyroscope's performance, this paper suggested a new high performance magnetic driving technology. In this technology, the driving performance is optimized by applying six-phase overlapped driving signal to the twelve driving coils of the stator. With this driving technology, the rotating speed of rotor in 3# industrial white oil can go up to 8700rpm.
System Simulation and Test of a Field Emission Accelerometer
Authors: Liu Hai Tao , Wen Zhi Yu , Chen Li , Wen Zhong Quan
Published: July 2013

Field emission accelerometer work in vacuum environment, the negative exponential relationship between the current and the distance of the cathode and anode electrode make the accelerometer has high sensitivity and serious non-linearity. A system simulation method by using SIMULINK tools was put forward, and the system simulation model was proposed. The system simulation was carried out under low vacuum and high vacuum environment. On the guidance of the simulation result, the circuit was designed and the performance of accelerometer was tested. The result indicated that the accelerometer have good linearity and sensitivity.
Fabrication of Super-Hydrophobic Surface on Stainless Steel Using Chemical Etching Method
Authors: Zhang Hai Feng , Liu Xiao Wei , Zhao Min , Wang Dong Bo , Shi Chang Zhi
Published: July 2013

Superhydrophobic surface have many applications such as drag reduction in the micro-electromechanical systems. A novel method of fabricating superhydrophobic surface is proposed using the simple wet chemical etching in this paper. Firstly, the surface of steel disc is polished by abrasive paper and then treated with chemical etching. Secondly, the surface of steel is modified with 1H,1H,2H,2H-Perfluorooctyltrimethoxysilane. The superhydrophobic surface was obtained on the stainless steel surface. Finally, the effects of the etching time and etching solution concentration were analyzed to the superhydrophobic performance. The experimentation results show that superhydrophobic performance is the best when the HCl concentration is 2mol/L, the etching time is 20 minute respectively. The water contact angle (CA) of the rotor surface is 152°. The water droplets are hardly able to stick to the steel surface．
A New Approach to Determine the Centroid of Star Spot for Star Tracker Based on MEMS-Gyro
Authors: Chen Nan , Xing Fei , You Zheng
Published: July 2013

Along with the development of MEMS technology, the precision of MEMS-Gyro is increasing and the range of application of MEMS-Gyro is expanding. The accuracy of centroid determination of the spot directly relates to the precision of star tracker, but, when the exposure time is shorter or the satellite is in an unstable state, the noise of detector limits the accuracy greatly in the traditional approach of centroid determination. In view of these issues, this paper presents an approach which is based on high-precision MEMS-Gyro to determine the centroid of spot. This approach references EKF to estimate the position of centroid optimally. So, when the SNR is reduced because of shorter exposure and unstable state, this approach can help to increase the accuracy of centroid determination by introducing MEMS-Gyro. Further, it improves the precision and dynamic performance of the star tracker. In the end of this article, the feasibility of the approach is verified by the numerical simulation.
A PID&AGC Method for Micro Vibration Gyroscope Drive System
Authors: Niu Shao Hua , Hong Dan Dan , Gao Shi Qiao
Published: July 2013

As a typical inertial sensor, vibration micro-gyro is extensively studied. According to its working principle, drive control system is an important element for the gyro system. The role of drive control system is to keep the drive modal stability including stable vibration frequency and amplitude. The PLL method is usually used to realize the drive system. However, it has some shortcomings used to high Q vibration micro-gyro. In this paper, the problems of the PLL method are analyzed, and a PID & AGC control system is introduced. By simulating and measuring, it is indicated that this method is fit for driving high Q vibration micro-gyro.
Structural Design of 2D Piezoresistive Micro-Force Sensor
Authors: Zhou Jie , Rong Wei Bin , Sun Li Ning
Published: July 2013

In order to detect the tool-substrate contact force and the tool-target interaction force during nano-manipulation process, a novel MEMS based 2D piezoresistive micro-force sensor structure was proposed. This structure can realize the 3D hardware decoupling for the X，Y and Z axis. Thus, the force detection in the vertical direction (Z axis) and parallel direction reference to base (X axis) can be done simultaneously. Theoretical analysis shows that this structure has a good structural sensitivity. The rationality and feasibility of the structure were confirmed by simulation results.
Modeling of Nonlinear Stiffness of Micro-Resonator in Silicon Resonant Accelerometer
Authors: Jing Zhang , Jiang Shao Dong , Qiu An Ping
Published: July 2013

Nonlinearities of the resonator in silicon resonant accelerometer (SRA) limit the ultimate short term frequency stability. In SRA, this stability is a measure of the achievable resolution. This paper discusses the nonlinear vibration phenomenon of micro-resonator considering the impact of the entire structure of SRA and builds a model to calculate the micro-resonator nonlinear stiffness K3,eff of the SRA prototype. The dies of SRA were fabricated by Silicon on Insulator (SOI) process. The equivalent model of the micro-resonator is built and the analytical value of the elastic constraint stiffness Ka of micro-resonator is derived as 8.91×104 N/m. It is calculated that K3,eff is equal to 5×1011 N/m3,and as a comparison, the simulation result is 5.026×1011 N/m3. The error between them is 0.52%. The nonlinear vibration experiments show that the maximum error between the theoretical and experimental value of resonance frequency is 2.1%. The prediction for the nonlinear stiffness contributes to further research on nonlinear vibration of the resonant beam. The model in this paper could also provide guidance and reference for optimal design of SRA.
A SOI-MEMS Piezoresistive Atmosphere Pressure Sensor
Authors: Du Li Dong , Zhao Zhan , Xiao Li , Zhang Meng Ying , Fang Zhen
Published: July 2013

In this paper, a SOI-MEMS (silicon on insulator- micro electro mechanical system) pizeoresistive atmosphere pressure sensor is presented using anodic bonding. Differently from the prevailing fabrication process of silicon piezoresistive pressure sensor: the device layer monocrystalline of SOI silicon wafer is used as the strain gauge with a simple deep etching process; and the SiO2 layer of SOI silicon wafer as the insulator between strain gauge and substrate. The whole fabrication processes of the designed sensor are very simple, and can reduce the cost of sensor. The Pressure-Voltage characteristic test results suggest a precision within 0.14% in linear fitting. It is shown that the temperature coefficient is 2718ppm/°C from the Typical temperature curve of the pressure sensors.
A Novel Flexible Shear Stress Sensor Array with Double Hot-Wires Based on MEMS
Authors: Sun Yong Ming , Liu Wu , Chen Hong Hai , Zhang Wei Ping , Chen Wen Yuan , Cui Feng , Wu Xiao Sheng
Published: July 2013

Design, production and calibration of a novel flexible shear stress sensor array with double hot-wire based on MEMS are presented in this paper, which can be applied to measure the surface shear stress of air craft or underwater vehicles. The sensor array is successfully fabricated by MEMS process, the electrical bond pads of which are located at the backside, thus greatly reducing the interference of the measured flow filed. The calibration has been carried out in the wind tunnel experiment, and the value of calibration factor is 8.35mV/ (m/s) in a flow velocity range from 0 to 35 m/s. The results of test experiments prove that the shear sensor array is well capable of measuring the flow velocity of boundary layer.
A Novel Initial Alignment Based on the HMM/Steady State KALMAN Filter
Authors: Ma Xing , Zhong Lun Chao , Han Jun Li , Liu Chang Shun
Published: July 2013

In allusion to low accurary and poor stability of the initial alginment based on the acceleration sensor, the HMM (Hidden Marco Model) / steady state Kalman filter is designed to solve the problem above. C8051F340 is used to sample the acceleration data of the MEMS acceleration sensor Model1221, then the digital low-pass filter is used to filter the acceleration data. The steady state Kalman filter based on the second order HMM model. The initial alignment algorithm outputs the angle value. The experiments demonstrate that the the HMM / steady state Kalman filter is more stable and more precise than the traditional algorithm.
Study of High-Temperature MEMS Pressure Sensor Based on SiC-AlN Structure
Authors: Lv Hao Jie , Geng Tao , Hu Guo Qing
Published: July 2013

In the paper, a touch mode capacitive pressure sensor with double-notches structure is presented. The sensor employs a special SiC-AlN-SiC sandwich structure to achieve high-accuracy pressure measurement in hash environment such as high-temperature. The analysis to the relation of capacitance and external pressure of the sensor shows that the sensor has high sensitivity and long linear range simultaneously. In addition, the technical process of the sensor has been designed in detail in the paper. The research shows that the sensor packaged in a high-temperature ceramic AlN can withstand higher temperature. Consequently, the sensor can be applied in high-temperature and harsh environment.
The Study on the Analytic Model and Design Software for IP of Piezoresistive Cantilever Beams
Authors: Zhu Jian Long , Li Wei Hua , Zhou Zai Fa , Huang Qin Gan
Published: July 2013

Piezoresistive sensor was one of the earliest silicon MEMS devices, which based on the theory of piezoresistive. In order to build the piezoresistive IP library for the MEMS foundry, we improved the structures of the piezoresistive based on the achievement of Liwei Lin1, and new analytic model and design software for square shape membrance has been developed. The ability to calculate sensitivity and linearity of MEMS piezoresistive sensor using the new model have been demonstrated. As results, output voltage, sensitivity and linearity characteristics of MEMS sensor are presented in this paper.
Preparation of In2O3/MWCNTs Nanocomposites and their Gas-Sensing Property to Ethanol
Authors: Zhang Li , Gu Fu Bo , Wang Zhi Hua , Han Dong Mei , Guo Guang Sheng
Published: July 2013

In2O3/multi-walled carbon nanotube (MWCNT) nanocomposites containing different MWCNT contents were synthesized via direct growth of In2O3 nanoparticles on the functionalized MWCNTs. The nanocomposites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The results exhibited that In2O3 nanoparticles with a diameter of approximate 10 nm were densely decorated on the surface of the MWCNTs. The gas sensitive performance of the nanocomposites to ethanol was also investigated. It was found that In2O3/MWCNTs sensor showed much higher response than that of the pure In2O3 sensor. Moreover, the sensing mechanism was discussed.
A Microfluidic Chip Microwave Bonding Method Based on the PMMA
Authors: Liu Xiao Wei , Han Xiao Wei , Zhang He , Jiang Xi Yun , Zhao Lin
Published: July 2013

A new bonding technique mainly for PMMA microfluidic chips is presented in this paper. In this technique, polymer microfluidic microchannels were bonded by microwave radiation. Its strength and time can be controlled accurately in watt and second level. There are so many techniques for mass-production of polymer microfluidic chip, such as heat bonding, ultrasonic bonding. However, we may find different kinds of shortages when we use these techniques. In this paper, the experiment result shows that microwave radiation’s strength and time have effects on microfluidic chip`s bonding strength. The microwave absorbing coating can also have a certain degree influence on microfluidic chip`s bonding strength.
Electrohydrodynamic Direct Writing Platform Based on Near-Field Electrospinning
Authors: Wei Jin , Zheng Jian Yi , Zheng Gao Feng , Lin Yi Hong , He Guang Qi , Liu Hai Yan , Sun Dao Heng , Liu Juan
Published: July 2013

Electrohydrodynamic Direct Writing (EDW) based on Near-Field Electrospinning (NFES) is a novel method to fabricate aligned micro/nano structure. In this article, linear motors and PIV&F servo control algorithm are introduced to set up an EDW experiment platform, by which patterned micro/nano structure can be direct-written. The motion track and position of collector is adjusted accurately by the platform, thus the deposition position and pattern of direct-written micro/nano structure can be controlled according to the pre-designed pattern. When motion velocity of collector higher than the ejection jet, micro/nano structure in straight line can be gained; but twisted structure can be direct-written under lower motion velocity of collector. The standstill of collector is introduced to overcome the pattern distortion that stems from the sharp change of collector motion track and the inertia of following jet. With the help of motion standstill, the patterned micro/nano structure without distortion can be direct-written, and more jet would be deposited at the corner of the pattern leaded to coiled structure. The EHD platform builds up the based for the industrial application of 1D micro/nano structure.
Study on the Performance of Y-Branch Waveguide Modulator Affected by the Fabrication
Authors: Liu Hui Lan , Wang Wei , Wang Jun Jie , Sun Guo Ming , Huo Guang , Zhou Chao Chao
Published: July 2013

The performance of Y-branch waveguide (YBW) modulator which is affected by the fabrication has been researched. The range of Y-branch corner deviation is obtained by analyzing the structural loss of the branch in the YBW which is limited by fabrication resolution. The effects on splitting ratio, mode field and coupling loss of YBW are also discussed through changing the waveguide width. It can be obtained that the difference between the two widths should be less than 0.25μm to meet the requirement of 5% error. And the maximum coupling efficiency can be achieved by adjusting the fabrication of waveguide to change the waveguide mode field. The corresponding fabrication tolerance can be attained based on the analysis.
The Preparation of High Concentration Silver Nanoplates with Liquid-Phase Reduction Method
Authors: Fu Ji Lan , Mo Li Xin , Li Ya Ling , Li Wei Wei , Li Wen Bo , Ran Jun , Fan Xin Ming , Li Lu Hai
Published: July 2013

Silver nanoplates, also referred to as nanoprisms or nanodisks, are two-dimensional plasmonic nanostructures that have attracted intensive attention due to their strong shape-dependent optical properties and related applications. In order to obtain the silver nanoplates with high concentration, the liquid-phase reduction method was adopted. Silver nanoparticles colloid was obtained by reducing the high molar concentration of AgNO3 (up to 3.17 M) with the hydrazine hydrate (H4N2 • H2O) as reductant in the presence of polyethylene pyrrole (PVP) as the protectant. 0.5 M Sodium Citrate is introduced into the precursor aqueous which containing AgNO3 and PVP, the molar ratio of PVP to AgNO3 was tuned from 0.64 to 1.5. When molar is 1.5, the mainly particles are silver nanospheres, on the contrary, the nanospheres are transferred into nanoplates as the ratio decreased gradually, until the mainly product are nanoplates. The constituent of the silver nano-clusters was established by performing the Powder X-ray diffraction. The nano-silver dispersion with average diameter is about 113.2 nm were finally deserved. The size distribution of the silver nanoparticles is recorded by the Zeta potential analyzer. Scanning electron microscope (SEM) was used to characterize the morphology of the nano-silver particles. The silver content is about 3%. Nano-silver colloid is obtained and purified by centrifugation and wash with deionized water and ethanol. Then, water-based silver conductive ink is obtained by adding some amount deionized water and additives and adjusted parameters, which could be widely used in printed electronics.
The Rapid Fabrication of Hydrogel Microfluidic Chip for Cell Capture Culture and Metabolites Detection
Authors: Fang Ke Jing , Hou Chang Jun , Huang Cheng Hong , Luo Xiao Gang , Zhang Su Yi , Shen Cai Hong , Huo Dan Qun
Published: July 2013

The microfluidic chip with well-defined structure is an important platform for cell research. The existing techniques for chip fabrication especially in cell biology and tissue engineering have many defects, for example, poor processing precision, high processing cost, as well as sophisticated manufacturing procedure. Thus, fabrication of simple and practicable microfluidic chip with highly efficient cell control ability and low-cost is turned to be the main target for bioengineering application. Poly(ethylene glycol) (PEG) is a hydrophilic polymer. Substituting terminal hydroxyl groups with acrylates, forming poly(ethylene glycol) diacrylate (PEGDA), allows the polymer to be cross-linked to form a three-dimensional polymer network. Meanwhile the use of photopolymerization can realize precise and temporal control of polymerization for formation of complex shapes. Herein, we utilize PEGDA hydrogel’s highly tunable characteristic, using photopolymerization method to obtain desirable micro-structure. Each chip has four of uniform micro-structures, which can carry multiple parallel experiments at the same time. We also add 2-Hydroxyethyl Methacrylate (HEMA) to the PEGDA prepolymer in order to increase the cell adhesion capacity of the microchip surface for cell culture. The experimental results showed that this method can achieve double-layer cell culture with short time treatment. Cells can be well captured and cultured in the hydrogel microfluidic chip with excellent activity. The hydrogel microfluidic chip has the potential of practicable application once large-scale preparation is accomplished.
Fabrication of Organic-Inorganic Hybrid Nanopore and its Application in Biosensing
Authors: Liu Lei , Wang Bing , Yang Yue , Ni Zhong Hua , Chen Yun Fei
Published: July 2013

Nanopore and nanopore based bio-sensing technology have become into more and more interesting research area in the past ten years. In this work, micro-pore in Si-S3N4 chips was fabricated and characterized by Focused Ion Beam (dual Beam), and then the S3N4 pore was covered by Polycarbonate (PC) membrane containing 50nm nanopores and sealed by using polydimethylsiloxane (PDMS) to get hybrid micro-nanopores. The obtained chip with hybrid nanopores together with two liquid cells was integrated into an ionic current detection device for biosensing. Based on this device, λ-DNA in the electrolytic solution can be detected when it is electrophoretically driven through the hybrid nanopores, and different gestures of λ-DNA in translocation also can be discriminated.
A Novel Microelectrode Array Probe Integrated with Electrophysiology Reference Electrode for Neural Recording
Authors: Wei Wen Jing , Song Yi Lin , Shi Wen Tao , Liu Chun Xiu , Jiang Ting Jun , Cai Xin Xia
Published: July 2013

Nowadays, the study of brain function is advanced by implantable microelectrode arrays for they can simultaneously record signals from different groups of neurons regarding complex neural processes. This article presents the fabrication, characterization and use in vivo neural recording of an implantable microelectrode array probe which integrated with electrophysiology reference electrode. The probe was implemented on Silicon-On-Insulator (SOI) wafer using Micro-Electro-Mechanical-Systems (MEMS) methods, so the recording-site configurations and high-density electrode placement could be precisely defined. The 16 recording sites and the reference electrode were made of platinum. Double layers of platinum electrodes were used so that the width of the reference electrode was as small as 6 μm. The average impedance of the microelectrodes was 0.13 MΩ at 1 kHz. The probe has been employed to record the neural signals of rat, and the results showed that the signal-to-noise ratio (SNR) of the novel probe was as high as 10 and the ordinary probe was 3. Among the 16 recording sites, there are 9 effective sites having recorded useful signals for the probe with reference electrode and 6 for the ordinary probe.
A PDMS Micropump for Implantable Drug Delivery Application
Authors: Ni Jun Hui , Zhan Bai Shao , Li Jun
Published: July 2013

This paper presents an integrated magnetic PDMS micropump for implantable drug delivery application. The micropump mainly consists of two structural PDMS layers: a PDMS functional layer that incorporates microchannels, a pump chamber and two planar check valves into a single layer, allowing for simple design and easy system integration, and the other PDMS membrane layer covering the pump chamber and holding a thin electroplated permalloy piece on top for magnetic actuation. The micropump can be driven by the interaction between the ferromagnetic permalloy and an external electromagnet, providing a remote and wireless operation method. Test results demonstrate that this micropump is able to produce a maximal flow rate of 0.15 μL/min at the driving frequency of 2 Hz with a volume resolution of approximately 1 nL per stroke, promising its application in various implantable biomedical systems.
Large Scanning Range and Rapid AFM for Biological Cell Topography Imaging
Authors: Yin Bo Hua , Chen Dai Xie , Lin Yun Sheng , Gao Ying Ying , Li Han , Han Dong
Published: July 2013

The small spatial displacement of the piezo tube scanner limits the AFM(Atomic Force Microscopy) scanning range, especially when facing up to cell topography scanning. And the low dynamic property of normal AFM tube scanner tube restricts the imaging speed. In order to achieve large scanning range and rapid scanning motion simultaneously, a special atomic force microscopy is designed. The 100um scanning range is obtained by the new scanner which is composed of the flexure guide structure instead of peizo tube. Furthermore, a new acquiring image method is used to eliminating AFM nonlinearity error. Using this scanning system, some large biological cells are imaged in liquid environments with 30 lines per second.
Color Filters Based on the Subwavelength Triangular-Lattice Cylinder Arrays in Metal-Dielectric Films
Authors: Shao Ren Jin , Ye Yan , Dong Xiao Xuan , Zhou Yun , Shen Su , Chen Lin Sen
Published: July 2013

Abstract: Color filter incorporating a subwavelength triangular-lattice cylinder arrays in metal-dielectric films on quartz substrate was proposed. The device consists of a quartz substrate, a triangular-lattice cylinder arrays in both dielectric layer of ZnS and a metallic layer of aluminum (Al). The broadband transmission characteristic of the proposed device in the visible wavelength range was investigated in detail by the rigorous coupled wave analysis (RCWA). Specially by discussing the effects of the structure parameters to the resonant wavelength, typical optimized structure parameters are obtained, in which more than 74.6% peak transmission efficiency with FWHM of ~ 80 nm were simultaneously achieved for the tricolor filters. The simulation results show that the peak transmission efficiency (PET) increases more than 17% with lower color cross-talk compared to the previous color filters.
Highly Efficient Nano-Catalysts Using Activated Carbon as a Support for One-Step Oxidation of Cyclohexane to Adipic Acid
Authors: Dai Huan , Zhu Ming Qiao , Li Wei , Tong Zhang Fa
Published: July 2013

A new route to substitute for the traditional two-step method for adipic acid production has been investigated. Supported nano metal catalysts Au/C and Co/C were prepared and used for liquid phase oxidation of cyclohexane to adipic acid with oxygen as an oxidant. These catalysts were characterized by XRD, TEM and ICP-AES. The reactions were carried out in an autoclave with solvent and radical initiator at 373~423K and 1.5 MPa. Au/C (1.25%) was found to be a highly efficient catalyst for the oxidation of cyclohexane with a high conversion (44.93%) of cyclohexane and more than 54.85% selectivity to adipic acid. It is indicated that there was a potential application prospect for the nano-catalysts in one-step oxidation of cyclohexane to adipic acid.
Preparation and Megnetic Performance Study of One Dimensional Co-Ni Nanomaterial
Authors: Lu Li Xiang , Yu Hong Ying , Sun Dong Bai , Lu Wan Heng
Published: July 2013

Co-Ni alloy nano array was formed in applied magnetic field via liquid phase reduction method using different surfactants as soft templates.At last, The microstructure and the size of Co-Ni alloy nano-powder were illustrated with FESEM, and the powder’s composition was analyzed by XRD. In this experiment,the reaction temperature, the types and amounts of the surfactants,the mole ratio of the initial salt, in the alloy powder’s morphologies,were all studied.Finally, The powder’s magnetic property was tested by using VSM.
Large Area Au Decorated Multi-Walled CNTs Film for Surface Enhanced Raman Scattering
Authors: Zhang Jie , Chen Yu Lin , Fan Tuo , Zhu Yong
Published: July 2013

We reported on a study upon a Surface-enhanced Raman Scattering (SERS) substrate produced from a large area multi-walled carbon nanotube (MWCNT) films decorated with Au nanoparticles. The morphology and spectrum of the MWCNTs/Au composite structure was characterized with scanning electron microscopy and spectrophotometer. The SERS signals of Rhodamine 6G (R6G) absorbed on the substrate were improved, which could contribute to the enlarged surface area for adsorption of molecules and Localized Plasmon Resonance Effect. The results indicated that it is potential to produce sensitive SERS substrates via further fine-tuning of size, shape of the nanostructure.
Microstructure and Mechanical Property of Nanocrystalline Surface Layer on 7A52 Aluminium Alloy
Authors: Wang Xiao Ming , Zhu Sheng , Chang Qing , Feng Xue Qiang
Published: July 2013

Surface nanocrystallization of 7A52 aluminium alloy was realized via non-equilibrium treatment induced by supersonic particles bombarding. Surface morphology and microstucture of the nanocrystalline surface layer were observed and analyzed by SEM, XRD and TEM, respectively. And the micro-hardness was tested using micro-hardness tester. The results indicated that the coarse grains on surface of 7A52 aluminium alloy could be refined to nanoscale via non-equilibrium treatment induced by supersonic particles bombarding. Average grain size on the superficial layer was approximately 40nm, micro-strain was about 0.12~0.14% and the thickness of nanocrystalline surface layer reached to approximately 80μm. Micro-hardness of the nanocrystalline surface layer was about 1.81times to that of the original substrate.
Controlled Synthesis of Surface-Clean Monolayer Graphene
Authors: Wang Xue Shen , Li Jin Jin , Zhong Qing , Zhong Yuan , Zhao Meng Ke
Published: July 2013

Controlled synthesis surface-clean monolayer graphene was achieved. Monolayer Graphene was achieved by mechanical exfoliation (ME) and chemical vapor deposition (CVD),and then transferred to SiO2 (300nm)/Si substrates. There were tape residues left on the surface of the ME graphene, and poly (methyl methacrylate) (PMMA)/photoresist residues left on the surface of the CVD graphene after the transferring and lithography process. Annealing method was used to clean all these kinds of residues. Annealing processes were performed at different temperatures in both vacuum and N2/H2. It is conclude that N2/H2 is crucial for the removing of residues, and 400°C is favorable for removing the residues. Atomic force microscope (AFM) images and Raman spectra were taken to confirm the effect of the annealing.
Structure and Mechanical Property of Asio Otus Feather Barbs
Authors: Gao Jia Li , Zhang Guo Qing , Guan Le , Chu Jin Kui , Kong De Yi , Bi Yan Tai
Published: July 2013

Avian feather is the outstanding protein fiber structure that still lacks an interpretation generally acceptable in any detail. In this paper, asio otus feathers were morphological represented and their barbs were mechanical characterized by a developed micro-tensile tester with a load resolution of 0.25 mN and a displacement resolution of 10 nm. With a tensile loading speed at 0.02 μm/s, Young’s modulus of the flight feather barbs with length of 1450-1900 μm was calculated to be 3.13-3.66 GPa, higher than 1.47-2.04 GPa for the down feather barbs with length of 520-710 μm. It is concluded that the asio otus’s flight feathers on its wing and tail are more rigid than the down feathers on its body.
Influences of Crystallization Temperature and Slurry Concentration on Stress of PZT Thick Film Prepared by a Modified Sol-Gel Method
Authors: Ren Wei , Zhao Xiu Chen , Li Jun Hong
Published: July 2013

As a key MEMS transducer materials, PbZr0.52Ti0.48O3(PZT) piezoelectric thick film should have good piezoelectric properties as well as lower stress. But now few studies on PZT film stress were carried out. The PZT thick films are deposited by a modified sol-gel method, and the influences of crystallization temperature and slurry concentration on stress are investigated in this paper. The result shows that the PZT thick film stress is tensile stress about 100-1000Mpa. With crystallization temperature increasing, thermal stress increases gradually. The stress increases about 3.5 times as the crystallization temperature rises from 600°C to 700°C. With powder concentration of slurry increasing, the stress of PZT thick film becomes smaller. The stress decreases about 7 times as powder concentration of slurry increasing from 1:4.5 to 1:3.5. The relationship between stress of PZT thick films and crystallization temperature is simulated by using the finite element method, and the results of simulation agree well with the experimental results.
A Rare Case of Langerhans Cell Histiocytosis of the Skull in an Adult: a Systematic Review
Authors: Chiong Corinna , Jayachandra Shruti , Eslick Guy D. , Al-Khawaja Darweesh , Casikar Vidyasagar
Published: July 2013

We report a 41-year old male who presented to the Emergency Department after falling while water-skiing. He had a previous medical history included chronic headaches, which had persisted for the last 2-3 months prior to presentation. Computed tomography of the head showed a small hypersensitivity with a small extra axial collection with a maximum thickness of 1mm. Differential diagnoses included an arachnoid cyst, haemangioma, meningioma or a secondary lesion. A diagnosis of Langerhans Cell Histiocytosis was made based on the histopathology examination and the immunoperoxidase staining.
National Athletic Trainers' Association Position Statement: Conservative Management and Prevention of Ankle Sprains in Athletes
Authors: Kaminski Thomas W. , Hertel Jay , Amendola Ned , Docherty Carrie L. , Dolan Michael G. , Hopkins J. Ty , Nussbaum Eric , Poppy Wendy , Richie Doug
Published: July 2013

Objective:

To present recommendations for athletic trainers and other allied health care professionals in the conservative management and prevention of ankle sprains in athletes.

Background:

Because ankle sprains are a common and often disabling injury in athletes, athletic trainers and other sports health care professionals must be able to implement the most current and evidence-supported treatment strategies to ensure safe and rapid return to play. Equally important is initiating preventive measures to mitigate both first-time sprains and the chance of reinjury. Therefore, considerations for appropriate preventive measures (including taping and bracing), initial assessment, both short- and long-term management strategies, return-to-play guidelines, and recommendations for syndesmotic ankle sprains and chronic ankle instability are presented.

Recommendations:

The recommendations included in this position statement are intended to provide athletic trainers and other sports health care professionals with guidelines and criteria to deliver the best health care possible for the prevention and management of ankle sprains. An endorsement as to best practice is made whenever evidence supporting the recommendation is available.