bluuebunny/crossref_metadata_2025 huggingface dataset:
Research of Automotive Airbag Automatic Folding Device
Authors: Zhang Wei , Guo Zhi Gang , Wang Xiao Dong , An Liang Dong , Chen Hui
Published: March 2013

In order to improve the quality of folding and increase the production efficiency in the process of airbag folding，a new airbag automatic folding device（AAFD） with programmable logic controller(PLC) as control unit and magnetic induction sensors as well as photoelectric sensors as trace positional parameters of rolling bag institutions has been developed. In addition, the important data of the device can also be stored by structured query language (SQL) which can query, update, and manage relational database system. The experimental results showed that, compared to a traditional AFD, the uniformity of gap during the production of airbag folding had been significantly improved, and the impact of human interference had also been reduced. Meanwhile, the device can produce a variety of types of products and also can ensure the quality of products, improve the production efficiency, and enhance the degree of standardization of the device.
Spatial Filtering Effect of Tip Clearance Using Capacitance Displacement Sensor
Authors: Xie Hai He , Yan Huang Ping , Huang Yuan Qing
Published: March 2013

According to structural characteristics and measurement needs of tip clearance of turbine engine and other rotating blade device, a leaves lattice model with vector characteristics is established. Based on measurement principle of the capacitive displacement sensor, the tip clearance measurement model is established. The spatial filtering effect and the impact of the tip clearance measurement results caused by blade thickness, sensing zone size, blade rotation speed and signal sampling rate is analyzed. The research results show that there is a minimum requirement about sensing zone size, blade rotation speed and signal sampling rate under the condition of certain blade thickness. The conclusion provides an important theoretical basis for the design of the tip clearance measurement system.
Effect of GFRP Shear Ties on Shear Behavior of Interfaces between Precast Concrete Panel and Extruded Polystyrene Special Insulation
Authors: Jang Seok Joon , You Young Chan , Yun Hyun Do
Published: March 2013

This paper describes the test results on the direct shear behavior of glass-fiber reinforced polymer (GFRP) shear tie reinforced interfaces between precast concrete sandwich panels (PCSP) and extruded polystyrene (XPS) insulations. The insulated PCSP consists of two concrete panels with 100mm or 80mm thick insulation between inner/outer concrete panel layers. In order to achieve composite action concrete panels are connected by corrugated GFRP shear connector. In this study, three types of couple replicate insulated PCSP with different embedment length of GFRP shear connector were made and loaded in push-out. The test results indicated that the reinforcement of GFRP shear ties for interface between PCSP and XPS insulation improves initial and post-peak shear performance of insulated PCSPs. These phenomena are remarkable for XPS insulated PCSPs with larger embedment length of GFRP shear connectors.
The External Thread Detection of Liquefied Gas Valve Based on Image Processing Technology
Authors: Wang Xiao Dong , Liu Bo , Chen Xiao Wei , Zhang Wei , Guo Zhi Gang
Published: March 2013

For liquefied gas valve external thread detections, the gauges traditional external thread detection. Although this method simply, easy to operate, but the detection process in contact with the thread and thus cannot guarantee the quality of the thread and the low detection efficiency. The external thread detection of liquefied gas valve based on image processing techniques adopts a non-contact detection. CCD camera collects image of the external thread and transmitted to the computer by the acquisition board. Thus image preprocessing, image segmentation and then get the thread edge contour. Finally, Matched thread profile .By comparing with the standard size tape to determine eligibility. The experimental results show that this method is feasible.
Coefficient Identification of Steam Network Model Based on Genetic Algorithm
Authors: Zhu Xiao Feng , Zhang Yong , Lu Zhao Feng , Ma Yong
Published: March 2013

This article establish a coupled thermo-hydraulic mathematical model for steam network by adopting a set of equations. Here, identification is defined as process in which a number of Steam Network model parameters are adjusted until the model mimics behavior of the real Steam Network as closely as possible. Test result indicates the advantage of genetic algorithm.
Design and Realization of Smart Home Environmental Monitoring System Based on Wireless Sensor Networks
Authors: Zhong Ling , Yang De Guo , Jiang Yan , Feng Hai Wen
Published: March 2013

After analyzing requirements of the intelligent home system with wireless sensor on environmental monitoring, security alarm , the system are designed and implemented. The system can get the temperature and humidity of room, light intensity data, and provide a sound alarm. SMS(Short Messaging Service) alarm , automatic processing means are used in the system too. With the system, people can query and control the device in the home remotely. The system has provided user with more methods to interact with his home.
A New Adaptive UPF Algorithm through Improved Relative Entropy
Authors: Yu Wen Tao , Peng Jun , Zhang Xiao Yong
Published: March 2013

Unscented particle filter (UPF) has high accuracy of state estimation for nonlinear system with non-Gaussian noise. While the computation of traditional unscented particle filter is huge and this depends on the particle number. In this paper we propose a new adaptive unscented particle filter algorithm AUPF through improved relative entropy which can adaptively adjust the particle number during filtering. Firstly the relative entropy is used to measure the distance between the posterior probability density and the importance proposal and the least number of particles for the next time step is decided according to the relative entropy. Then the least number is adjusted to offset the difference between the importance proposal and the true distribution. This algorithm can effectively reduce unnecessary particles meanwhile reduce the computation. The simulation results show the effectiveness of AUPF.
An Efficient Iris Segmentation Method for Non-Ideal Iris Images
Authors: Xu Xiao Wen
Published: March 2013

Segmenting the non-ideal iris images accurately is a main problem for iris recognition, due to the impact of the eyelids, eyelashes and deformation. The paper presents an iris segmentation method based on an improved level set. Firstly, we used gray projection algorithm to locate the pupil. Secondly, we applied the least square fitting algorithm to estimate the boundary between the pupil and the iris. Finally, we used the level set method to accurately segment the iris. Experimental results demonstrate the segmentation accuracy for outer boundary of the iris is 98.59%. The method presented in this paper is superior to Daugman method and Hough transform algorithm in iris segmentation, especially for non-ideal iris images.
High Sensitivity Refractive Index Sensor Based on Long Period Fiber Gratings in Line Mach-Zehnder Interferometer
Authors: Zheng Jia Rong , Yu Yong Qin , Ou Zhi Long , Du Chen Lin , Yan Pei Guang , Wang Ji Shun
Published: March 2013

Mach-Zehnder interferometer formed by a pair of long period fiber gratings on single mode fiber is investigated as surrounding refractive index sensors. Interference fringes with bandwidth of 1.68 nm are induced by core mode and the excited cladding mode. High SRI sensitivity of 280.74 nm/RIU at 1437.74 nm in the range of 1.333 to 1.360 is achieved. Whilst the strain sensitivity (~0.33 nm/mε) and temperature response (~20.7 pm/°C) at 1428.64 nm are relatively low, which is superior in avoiding cross sensitivity in refractive index measurement.
Analysis of Displacement Monitoring Measurement in Tunnel Construction
Authors: Liu Yang , Hu Jie
Published: March 2013

Based on measured data of Wuxinzhai tunnel in expressway of Shanyin to Pinglu, mathematical methods were used to make regressing analysis of measured date on crown settlement and periphery convergence. According to the time-effect of soil mass excavation in New Austrian Tunneling Method, the relations between rock deformation and time during the tunnel construction was analyzed. The results of analysis could provide an theoretical basis for modifying design and construction , and also could offer an example for similar projects in this area.
A Modified MUSIC Algorithm for DOA Estimation
Authors: Su Shu Jing , Zheng Wen Qiang
Published: March 2013

In this paper, a method of being modified 2-D DOA estimation is presented. By reconstructing covariance matrix of the received array data, the correlativity of the incident signals is recreased, and mis-division between signal subspace and noise subspace is controlled, therefore the number of estimated signals would be equal to the number of actual incident signals. This method has good performance not only for DOA estimation of the correlation signals, but for DOA estimation of the non-correlation signals. In addition the computational complexity will not increase obviously. The simulation tests verify the validity of the presented algorithm.
Fabrication of Multi-Level Photoresist Patterns in One-Step Lithography by Using Cr/Ni Multi-Film Thickness Mask
Authors: Siwarakrangsun Narongchai , Atthi Nithi , Porntheeraphat Supanit , Jantawong Jirawat , Leksakul Komgrit , Poyai Amporn
Published: March 2013

The 3-D microstructure can be formed by using Multi-film thickness mask (MFT-mask) with single exposure and single develop. The intensity of the UV light getting through the mask increases as the thickness of the chromium film decreases. However, the ultra-thin Cr film makes the deposition and etching process of Cr film difficult to control. By depositing the nickel film as a buffer layer on the Cr film, the Cr/Ni film stack can filter the UV light and increase the amount step of the light intensity. This can improve the performance of the MFT-mask to generate fine 3-D patterning step similar to gray-scale lithography with lower cost.
A Simulation and Prediction Method of the Height of Wheat Based on BP Neural Networks and the Ant Colony Algorithm
Authors: Li Hong Yi , Wu Xi Xin , Wang Tong , Zhao Di
Published: March 2013

This paper focuses on the simulation and prediction problem of height of the crops, particularly the wheat, which plays a significantly important role in its yield, in different growing stages. Our model bases on the BP neural network and the ant colony algorithm. Both of these two algorithms has their own advantages and disadvantages. However, through observations, we find that their advantages and disadvantages seem to be complementary, by which we propose the combination algorithm. This combination algorithm can conquer the local optimum problem of the BP Neural Network, and could overcome the shortcomings of the weak local optimum searching capability of the ant colony algorithm. The experiments show that the our proposed algorithm can hopefully yield good simulation and prediction results of the height of wheat in different growing stages.
Red Blood Cell Image Extraction Based on Mathematical Morphology
Authors: Zhou Liang , Weng Gui Rong
Published: March 2013

This Red blood cell image segmentation based on mathematical morphology. It aims to segment the morphology of red blood cell from the integral cell and extract the morphology of the red blood cell which preparing for the subsequent pathology analysis. The experiment shows that this processing method has strong capability of anti-noise. It is effective and feasible.
Research of Maneuver Ship Meteorological Instrument Data Real-Time Acquisition and Processing System
Authors: Song Ying Zi , Kong Lu , Wu Zhi Jian
Published: March 2013

The maneuver ship meteorological instrument --Data acquisition and transmission means backward, timeliness, The data can not be collected timely and effectively used in meteorological support the status quo, Ship data collection, transmission and processing mechanisms and key technology research in the sea channel under unstable conditions, Makes data center located on the shore a timely and effective manner to get the maneuver ship meteorological instrument data, The ship into the sea motorized automatic weather observation stations, Enhanced the existing meteorological live display system observation data time density Provide more accurate weather forecast, meteorological support command decisions in a timely manner, the dense data services.
LBS Hybrid Encryption Scheme Based on IMSI Pseudonym
Authors: Li Lei , Chen Ang , Chen Jing , Zhang Zhi Hong
Published: March 2013

A hybrid encryption scheme based on the IMSI pseudonym is proposed in this paper. The security model of the scheme is deployed in a cloud environment, and the IMSI pseudonym as a unique identity of a user in the transmission and storage process, which marks and identifies the user, to ensure the privacy of his identity information. Hybrid encryption scheme between communicating parties can be achieved by combining the public-private key pairs updated frequently and symmetric key related to the user identity information, which fully considers the privacy information on security of storage and wireless network transmission and effectively alleviates the current LBS security risks.
Analysis of Elastic Recovery Property Based on the Mesh Structure of Spun-Laced Nonwovens
Authors: Zhang Yin Jiang , Xu Xiao Ping , Jin Xiang Yu , Zhang Zhi Feng
Published: March 2013

By means of entanglement and consolidation, fibers form stable web in spun-laced nonwovens, it initially conceived fibers entanglement structure and analyzed morphological changes in the stress state, the result showed that the elastic recovery property of spun-laced nonwovens could be adjusted through the deformation resilience of water mesh and the elastic fiber itself. Meanwhile the mathematical model demonstrated the most common "u-shaped" entanglement method between fibers,so fiber I slip from the fiber Π which met the equation T1 = T0×e μ θ. Under the same water jet pressure condition, larger static friction coefficient (μ) or fiber coated Angle (θ) equals better fiber entanglement, more stable structure and better elasticity. Combining the actual production with ideal mesh model, the size relations of horizontal and longitudinal extension deformation about Δ L and Δ L' was discussed. The results showed that the elastic recovery property of nonwovens could be improved through changing fibers arrangement of the fiber web.
Research on Application of WMSNs in Ubiquitous Learning Environment
Authors: Chen Jin Hua , Song Jing , Li Ying
Published: March 2013

WMSNs is one of the most cutting-edge technologies of the field of informatics, and compared to other sensor technology has broad prospects for development. WMSNs has very high service quality, larger multimedia data transmission amount, multimedia data flow model, a wide variety of application services and other characteristics. WMSNs support for education and teaching in support of ubiquitous learning environment. According to the characteristic of WMSNs, expounds the WMSNs support ubiquitous learning environment and function principle, as well as WMSNs ubiquitous learning environment application.
Research on the Welding Technique of Quenching and Tempering Steel
Authors: Guo Bi Xin , Du Xiao Wei
Published: March 2013

This paper discusses welding technique of quenching and tempering steel after final treatment, and raises a composite welding technique and its corresponding welding condition by combining SMAW and TIG welding. Finally, technical experiments and performance tests have been done on typical parts of high strength steel, the results are satisfactory and indicate that it may be used in aircraft maintenance.
Microstructure and Properties of Laser Cladding Fe-Al Intermetallics
Authors: Ye Hong , Peng Shi Xin , Yan Zhong Lin , Zhang Xiao Bin
Published: March 2013

Fe-Al intermetallics coatings are prepared on an aluminum alloy ZL114A by laser cladding pure Fe and Al powders. The microstructure and hardness of the coatings are analyzed by using optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and microhardness testing machines. The results show that a fine surface quality can be obtained under a suitable process parameter of laser. The laser cladding layers are mainly consisted of FeAl, FeAl3, Fe2Al5 and Fe3Al phases. The two cladding layers (60Fe-40Al, 90Fe-10Al) have high microhardness, which achieve HV520 and HV890.
Experiment Study on Spatial Magnetic Field of Large Gap Magnetic Drives System
Authors: Xu Yan , Pang You Xia , Tan Yong , Zou Wei
Published: March 2013

On the basis of the working principle of the large gap magnetic drives system, the distribution principle of system’s spatial magnetic field under the 4 pole states of T78 electromagnet along the direction and the direction was measured. The experiment results were analyzed. The study results show that the permanent magnet can be placed in a more powerful magnetic field in its rotating period and could get large magnetic field’s coupling force by increasing the current properly, decreasing the coupling distance of magnetic pole between electromagnet and permanent magnet, and putting the permanent magnet into the ±5-10mm range of electromagnet.
Tunable Wavelength Filter Based on Complex Period Photonic Crystal
Authors: Yu Hai Xia , Gao Xian Jun , Shi Yan Li
Published: March 2013

A new-style tunable photonic crystal filter was proposed, its structure is the liquid crystal defect films are introduced to the one-dimensional photonic crystal periodically composed by three different refractive index mediums. The spectrum transmission was obtained by using the transfer matrix method and liquid crystal Jones' matrix, we synthetically analyze the properties of the complex period photonic crystal infiltrated with nematic liquid crystal and the influence of many factors such as liquid crystal thickness, photonic crystal periodicity and adjacent medium thickness increment. The filter has different job windows in 1550 nm、1330nm etc, by changing the thickness increment of the adjacent medium behind the liquid crystal, and the tuning range of which has 30nm and above .
Research on Tropical Agricultural Products Quality Recognition and Detection System Based on Electronic Nose Technology
Authors: Zhang Kun , Wang Hai Feng , Dai Sheng Pei
Published: March 2013

This article describes the invention and development of electronic nose technology. According to the International and domestic technology development situation in recent years and based on the basis of the electronic nose technology for mango, banana, papaya and other the typical tropical crops products, for example, to have the quality identification detection experiment with Agricultural and sideline products .Compare PCA-BP the LDA-BP neural network recognition effect Design a conceived program. which is a professional portable electronic nose technology systems, Specifically for Hainan's tropical agricultural products quality inspection.
The Influence from Drainage System to the Overall Layout of the Residential Building in Village
Authors: Chen Hao , Cai Shou Jun , Zhang Juan , Zhang Feng
Published: March 2013

This paper studies the relationship of coordinated between the drainage system and the whole layout of residential building in village. According to the requirements in the construction and design of living area, including the characteristics of the drainage system, and probes into the characteristics of the drainage system with the design, construction and operation for the residential building the overall layout in villages. That the reasonable construction overall layout, it can let the drainage facilities have a better work condition and improve it worked in an efficiency way.
A Novel Method for Text Similarity Calculation
Authors: Rui Cai , Fei Li , Bin Chen , Cong Quan
Published: March 2013

In view of the fact that traditional vector space model for text similarity calculation which does not take word order into consideration leads to bias, this paper puts forward a longest common subsequence and the traditional vector space model of combining text similarity calculation. This method takes the word order and word frequency information into account, using the texts of the longest common subsequence and substring of their information from all public records and the use of word order and word frequency in the text. The importance of similarity calculation is acknowledged, and the traditional vector space model in the calculation of the weight is used on the word frequency information. Some of the dataset collected through the web crawler are used in the proposed text similarity calculation method for testing, and the results proved the effectivity of the method.
Mobile SSL VPN Based on Port Forwarding
Authors: Zhang Yun He , Kou Xiao Hui , Wang Mei Zhen , Xiao Ling , Li Wei Ming
Published: March 2013

Considering the inadequacy of deploying the SSL VPN on mobile devices, we proposed a mobile SSL VPN system which can be used on mobile devices without any complex setups. The system mainly based on port forwarding and OPENVPN. This paper analysed the principle of this system and processing flow, then we collected the experimental results and made some improvement.
Simulated Comparison of Impact Pad and the Experimental Swirling Chamber in Tundish
Authors: Seňová Andrea , Buľko Branislav , Kijac Jozef , Šolc Marek
Published: March 2013

In this paper is compared residence times of tundish equipped with Turbostop and tundish equipped with experimental swirl chamber. Set of measurements in this paper was performed in the Laboratory simulated flow processes (LSSP). Water model is assembled at scale 1:3 to original. Measurements were evaluated by graphical measuring of water conductivity variation at tundish inlet and outlet by adding potassium chloride into tundish inlet and visually where KMnO4 was used as an indicator.
Preparation and Pharmacokinetics of Candesartan Cilexetil with Polymer Materials in Self-Microemulsifying Drug Delivery Systems
Authors: Li Rong Rong , Xie Zhi Fei , Liu Ming Xing , Zhu Hong Da
Published: March 2013

The candesartan cilexetil SMEDDS with PEG-PLA as long-circulating materials were successfully prepared and characterized by appearance, size and size distribution, morphology of emulsion and stability. The emulsion showed a narrow size distribution, well-proportioned in good agreement with polydispersity index of 0.005 and 3.6 nm diameter. The candesartan cilexetil SMEDDS were precipitated for 30 days at 25 °C or 37 °C. Meanwhile, Pharmacokinetics experiments illuminated that the candesartan cilexetil SMEDDS in rats had a larger drug curve concentration (AUC) compared to the tablets in the experiments.
A Review on the Properties of Bricks Prepared with Recycled Waste Materials - Postearthquake Waste Consideration
Authors: Zhao Xiao , Wang Qing Yuan , Liu Yong Jie
Published: March 2013

A huge number of buildings collapsed during the earthquake in Wenchuan. Recently, solid waste management of these post-earthquake wastes has becomes a major management concerns in Sichuan. As yet, no specific plan has been formulated for managing those components of the disaster. In addition to this, immediate efforts are needed to rebuild the collapsed houses within the city. Therefore, this paper aims to overview of some of the research published regarding the use of recycled waste or by-products in concrete blocks or bricks production. The mechanical properties such as compressive strength, tensile strength, water absorption and shrinkage are presented. Studies show that bricks and blocks can be made with recycled waste or by-products.
A New Application of Bimetallic Thin Film
Authors: Yang Xiao Yu , Zhou Wei
Published: March 2013

To perform the temperature compensation, a bimetallic thin film with different thermal expansion coefficients is deposited on the surface of the crystal plate. The thermal stress generated in the crystal and the thin film will cancel each other when temperature changes, thus improve the frequency stability of the crystal oscillator. In this paper, a finite element simulation was carried out for the crystal plate with bimetal, and then an experiment was performed to verify the FEM simulation results. The result shows that this approach achieves good temperature - frequency characteristics and reduces the frequency shift of crystal oscillator.
Fixed Transition Experimental Study on Airfoil Aerodynamic Characteristics of Kinds of Damaged Carborundum Strip
Authors: Wang Na , Gao Chao
Published: March 2013

For the sake of improve the veracity and the reliability of the simulating the configuration of the bound layer above of the aircraft by manual fixed transition, discussing the influence of the dynamic coefficient and pressure coefficient of different types of the carborundum strip to enhance the efficiency of the experiment which of 3mm width from the leading edge at the location of 7% chord. At subsonic condition of Mach number is 0.5, The characteristic of the lift coefficient keeps insensitive of three breakage, and the drag coefficient shows the influence coming forth after attack angle greater than 6 degree, and the infection less as the breakage longer instance of the symmetry. When Mach number is 0.75, lift coefficient and drag coefficient shows the influence coming forth after attack angle is equal or greater than 6 degree, and the infection less as the breakage be longer instance of the symmetry.
Microstructure of Ti6Al4V after Ultrasound-Aided Deep Rolling
Authors: Li Li , Fu Zhen Yu , Li Tao , Liu Jin Jun , Tian Zheng Yu , Zhang Guo Zheng
Published: March 2013

Ti6Al4V titanium alloy was treated by an ultrasound-aided deep rolling (UADR) process. The microstructure of UADR treated specimen was observed via using scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). Results show that ultrasound-aided deep rolling produced nanocrystallized microstructure of grain scale typically less than 20 nm on the immediate surface of Ti6Al4V. A nanometer to submicron gradient structured layer penetrating to a depth of about 150 μm was formed after UADR treatment. The above improvements of surface microstructure of the UADR treated specimen is believed to be beneficial to its anti-fatigue performance.
Study on the Application of Nano-Antibiotic Materials in Interior Decoration
Authors: Hu Rui Ling , Wang Kun Qian , Li Man
Published: March 2013

This paper presented an elaboration on environment-friendly antibiotic nanometer materials, and analyzed the application of nanotechnology in the indoor decoration. And also it applied the environment-friendly non-antibiotic materials in interior decorative materials such as floor tiles, wall tiles, latex paint, carpets, bathroom facilities and kitchen utensils. It is innovatively environmental friendly, antibacterial, anti-aging, antifouling and fireproofed with many other outstanding properties for the decoration material, so it has wide application and good prospects.
Preparation and Characterization of NiO Nanoarrays with Different Hierarchical Porous Structure
Authors: Wu Hai Yan , Zhang Xiao Li , Su Feng Yun , Liu Ting Ting , Zheng Xiu Cheng
Published: March 2013

NiO nanoarrays with different hierarchical porous structures were synthesized by using hard-template SBA-15. The analytic results showed that the mesoporous structure parameters of the as-prepared NiO nanoarrays increased obviously with the increase of the addition of SBA-15 to a certain extent. The results may be helpful for the utilization of NiO as supercapacitors.
Nanoholes with Defects Fabricated by Focused Ion Beam Milling
Authors: Jiang Xiao Xiao , Gu Qiong Chan , Wang Feng Wen , Ma Zhen He , Lv Jiang Tao , Si Guang Yuan
Published: March 2013

Subwavelength nanohole arrays have been thoroughly studied for years. However, investigations on nanoholes with defects are seldom reported. Here, we study the optical properties of nanohole arrays with different defects which are fabricated by focused ion beam lithography. Finite difference time domain simulations are also performed to verify the experimental results. Our approach may find extensive applications in sensing and optical waveguiding.
Growth and Photoluminescence of β-SiC Nanowires on Porous Silicon Array
Authors: Wang Hai Yan , Kang Li Ping , Wang Yong Qiang , Li Zi Jiong
Published: March 2013

Nonaligned and curly β-SiC nanowires (nw-SiC) were grown on porous silicon array (PSA) by a chemical vapor deposition method with nickel as the catalyst. The morphology, structure and the composition of the nw-SiC/PSA and the SiC-SiO2core-shell fibers which is the semi-product were characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Based on the experimental results a possible growth mechanism of nw-SiC was explained. Two broad photoluminescence peaks located around ~409 and ~494 nm were observed in nw-SiC/PSA in the PL measurement when utilizing 300 nm ultraviolet fluorescent light excited at room temperature. The excellent luminescent performances are ascribed to the quantum confinement effects in nw-SiC. The optical merits of nw-SiC/PSA made it a promising material in the fields of ultraviolet-blue emitting devices.
Effects of Nano-Sized Titanim Dioxide (nTiO2 ) on the Growth and Biophysical Characteristics of Chlorella sp.
Authors: Fu Bao Rong , Li Nan , Wu Jian , Hui Xiu Juan , Li Xia , Zhang Run Jie
Published: March 2013

The study was conducted to investigate the effects of nano-sized titanium dioxide (nTiO2 )on the growth and biophysical characteristics of Chlorella sp.. Chlorella sp. was cultured in HB-4 medium and exposed to 7 levels(0,1,5,10, 20, 40 and 80mg/L)of nTiO2.The results showed that EC50 of nTiO2 was 26.52 mg/L after 96-hr exposure. In 5 levels (0,10, 20, 30 and 40mg/L)of nTiO2 after 96-hr exposure, the content of Chl-a and the soluble protein was reduced with the increasing concentrations. Because of nTiO2 caused the increase of permeability of Chlorella sp.'s membrane, some soluble materials got out of Chlorella sp.'s cell, such as polysaccharide.The value of conductivity and polysaccharide content was increased with concentrations. When the concentrations of nTiO2 were higher than 20mg/L, the physiological function of Chlorella sp. was inhibited obviously, and the activity of peroxidase and dehydrogenase decreased. As a result, there was the potential harm to the aquatic environment by using nTiO2.So the toxicity of nTiO2 and the mechanism of aquatic lives deserved special concern.
Synthesis and Characterization of MCM-41 Molecular Sieves Nanoparticals
Authors: Wang Li Qin , Han Yang , Fu Xiu Jun , Wu Hai Tao , Chang E , Wang Hai Ying , Huo Quan , Zhang Rui Jun
Published: March 2013

Nanoparticals of MCM-41 molecular sieves were synthesized at near room temperature with cetyltrimethylammonium bromide (CTAB) as template agent. The prepared samples were characterized by the means of scanning electron microscopy (SEM), X-ray powder diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), N2 adsorption tests, thermogravimetric and differential thermal analysis (TG-DTA). The results suggested that morphology of MCM-41 molecular sieves samples with high crystallinity was almost uniform spherical, and the particles size was almost less than 100 nm. The adsorption-desorption isotherms were corresponded to typical type IV isotherms with the hysteresis loop of type H2, which showed the samples had mesoporous structure. The pore size distribution of samples were 1.69 nm and 3.58 nm, and the specific surface areas was up to 752.23 m2/g. The decomposition temperature of template agent CTAB was around 327 °C, while the framework for MCM-41molecular sieves was stable. So MCM-41 molecular sieve samples synthesized at near room temperature had excellent physical properties.
Applications of Nanotechnology in Hip Implants
Authors: Li Xue Zhou , Wang Chen Yu , Xiao Jian Lin , Qin Yan Guo
Published: March 2013

With the development of medical technology, the medical surgery requires increasingly advanced biomimetic materials. The ideal joint prosthesis should have following properties anti-corrosion, bone ingrowth, anti-infection and same mechanical properties of natural bone. In recent years, nanomaterials in orthopedic applications attracted more and more attention. Nanometer-size materials made ceramics, polyethylene, metals have been tested and verified in orthopedic implants. As the devices made by nanomaterials can mimic the dimensions of constituent components of natural bone, so it could promote adequate osteointegration and enable the prosthesis to be successful for long time. In this paper, we discussed the nanomaterials’ ability to promote bone growth, ingrowth and anti-infection of the joint prosthesis.
Theoretical Study of Adsorption CO Molecule on Palladium-Doped Boron Nitride Nanotubes
Authors: Sun Miao , Xu Jing Wen , Cui Yu , Wu Gong Lian , Zhang Hui , Li Ze Sheng
Published: March 2013

By using the density functional theory (DFT), we have investigated CO molecules adsorbed on palladium atom doped (Pd-doped) (5, 5) and (6, 6) boron nitride nanotubes (BNNTs). In order to investigate the electronic and structural properties of all the research objects, we calculated the band gap (Eg), bind energy (Eb), and density of state (DOS). The results show that energy gaps of BNNTs reduced by doped impurity Pd atom, but there are no obvious changes with the tube diameter of Pd-BNNTs change. One impurity Pd atom substituting one B (PdB) or N atom (PdN) of pristine BNNTs can increase the reactivity with CO molecule. The energy gaps for CO molecule adsorption on the tube wall of Pd-BNNTs reduced. This indicates that Pd-doped BNNTs can be considered as nano gas sensitive material.
In Situ Polymerization Organic-Inorganic Hybrid Materials Monomer Casting Polyamide 6/ Nanorods Yttrium Hydroxide
Authors: He Wei , Zhuang Mi , Li Yan Xin , Luyt A.S. , Ge Tie Jun
Published: March 2013

Single crystalline Y(OH)3 nanorods were synthesized from Y2O3 powder by a simple hydrothermal synthesis method under alkaline conditions. SEM images displayed that the nanorods have average diameters of about 400nm and lengths up to several micrometers. In this paper, it is used nano-inorganic particles yttrium hydroxide to modified MC nylon. The different mass fraction of yttrium hydroxide has affected mechanical and thermal properties of the MC nylon composites. The results show that with increasing of the mass fraction of yttrium hydroxide, the impact strength is the highest value when yttrium hydroxide mass fraction of 0.25wt%, however the tensile strength decrease 20%. And there is a little change in thermal stability when Yttrium Hydroxide added.
Study on Preparation and Characterization of Modified Montmorillonite with the Aromatic Isocyanate
Authors: Gu Xiao Hua , Zhang Xi Wei , Zhou Jia Liang , Xu Bao Yun
Published: March 2013

In this article, the methylene diphenyl isocyanate (MDI) containing two benzene rings was used to modify montmorillonite. The detection analysis of the original MMT and the samples after modification were investigated by infrared spectroscopy (FT-IR), x-ray diffraction (XRD) and thermo gravimetry (TG). Analysis of detection results shows that MDI and the surface of montmorillonite form chemical bonds and the spacing of montmorillonite layer increases from 1.24 nm to 1.86 nm. It provides highly active terminal isocyanate groups in situ polymerization for the montmorillonite and smart materials. It will improve the compatibility of the MMT and polymer, and allows the montmorillonite have always been able to maintain a good dispersion in polymer. Meanwhile the diphenyl isocyanate into ring can improve the heat stability of montmorillonite-modified polymer.
Synthesis of Double-Walled Carbon Nanotubes by Floating Chemical Vapor Deposition Method in a Reactor with Varied Diameter
Authors: Yu Chang , Meng Xiang Tong , Zhang Lei , Qiu Jie Shan
Published: March 2013

Double-walled carbon nanotubes (DWCNTs) have been synthesized by a floating catalytic chemical vapor deposition method (FC-CVD) in diameter-varied reactor with xylene as carbon sources, ferrocene as catalyst precursor, and sulfur as additive. The as-grown products were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), and Raman spectrometer. The results show that DWCNTs with a high graphite degree is centimeter-scale in length, and the inner diameter varies in the range of 1.5-1.7 nm. The effect of reactor diameter on the structure and morphology of the products was also investigated and compared. It is believed that the diameter-varied reactor may become a feasible route to the mass and continuous production of DWCNTs.
Influence of Chromium on CO2/H2S Corrosion Behavior of X100 Grade Pipeline Steel
Authors: Zhang Jun Sheng , Wu Hui Bin , Wang Li Dong , Tang Di , Liu Li Fu
Published: March 2013

Four kinds of X100 grade pipeline steels containing different chromium content were designed and corrosion behavior were studied in order to confirm the influence of Cr on the properties of high grade pipeline steel. The corrosion experiments demonstrated that Corrosion rates of Four steels in the experiment decrease with the increasing of Cr content, and the scales on the four steels have a two-layer structure under the corrosion of CO2 and H2S. The outer layer is mainly composed of FeS or FeS1-x and the inner layer consisted of FeCO3. Cr enriches in the inner layer and Cr content of the inner layer increases with the Cr content in matrix. The Cr enrichment enhanced the compactness of the scales further hindered the diffusion of ions from liquid to the surface of steel. The corrosion scale with Cr(OH)3 is anion-selective and reduce the amount of anion reaches metal surface, thus reducing corrosion rate.
Performance Study of Fiber Reinforced New Lightweight Insulation Materials
Authors: Zhao Huan Qi , Li Guo Zhong
Published: March 2013

Cement-based lightweight insulation materials were made. Cement and fly ash are main raw materials. The self-developed composite excitation agent and foaming agent are used. The method of foaming is the physical foaming. The inflection of fiber dosage on the performance of lightweight insulation materials was researched. Its influencing mechanism was discussed. Experiments show that foaming lightweight insulation materials were made with 1.22MPa bending strength, 2.95MPa compressive strength and the 0.072W/mk coefficient of thermal conductivity when the fiber mixing content is 1.2%.
Preparation and Study on the Performance of Glazed Hollow Beads Thermal Insulation Materials
Authors: Li Xiao Long , Li Guo Zhong
Published: March 2013

The glazed hollow beads thermal insulation board was made of glazed hollow beads and perlite by selecting cement and fly ash as cementitious materials, and adding appropriate amount of VAE emulsion and fibers, in the compression molding process. In this paper, the influence of different dosages of perlite replacing vitrified beads, VAE emulsion and fiber on the material properties were studied. Besides, the internal morphology of the sample was observed by scanning electron microscopy, and the action mechanism of the insulation material was explored.
Structure Activity of Pb2+ Adsorbed by Modified Streptomyces erythreus
Authors: Wang Jun Feng , Zhong Chang Ming , Liang Qi , Li Xiao Bo , Zhu Hua
Published: March 2013

Using Streptomyces erythreus isolated from pharmaceutical residues as a biosorbent, the characteristics and mechanism of its absorbing Pb2+ was studied. The results showed that absorptive ability of bacterial mycelia modified by sodium hydroxide was improved greatly. The reaction mechanism of modified bacterial mycelia uptake Pb2+ was analyzed by back scattered electron microscope(BSEM) and infrared spectroscopy (IR). The results of experiments indicated that some chemical groups such as -COO-、C-H and O-H among cell walls of bacterial mycelia might play the key functions adsorbing Pb2+. It was presumed that the process of modified bacterial mycelia lead uptake might be a chemical and physical process collaboratively which occurred on the cell surface of bacterial mycelia chiefly based on exchangeable reaction.
Ultrasonic Nondestructive Testing on False Welding Joint of Spot Welding for 00Cr18Ni10N Stainless Steel
Authors: Zhang Yong , Liu Zong Fang , Xie Hong Xia , Guo Lian Zhi
Published: March 2013

00Cr18Ni10N stainless steel spot-welded joints were inspected by ultrasound in transmission mode under the water. By comparing and studying ultrasonic transmission wave signals of the spot welded joint of existing nugget and the false welded joint which were received by digital oscilloscope, we find that there are differences in degree of attenuation between multi transmitted wave and primary transmitted wave of two kinds of joints. The degree of attenuation of multi transmitted wave of false welded joint is obviously less than that of the joint with nugget. Therefore, false welded joint can be judged and identified through the degree of attenuation of multi transmitted wave relative to primary transmitted wave, and the dissection results verify the feasibility of this test method.
Synthesis of AgCl/BiOCl Composite Photocatalyst and its Photocatalytic Activity under Visible-Light Irradiation
Authors: Zhang Li Shan , Long Teng Fa , Yan Chang Qi , He Xing Cun , Cheng Meng Lin , Zhong Shan
Published: March 2013

A series of BiOCl photocatalysts with different AgCl contents have been synthesized by a simple hydrolysis method at room temperature using BiCl3 and Bi(NO3)3•5H2O as the main raw materials. The resulting products were characterized with X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and UV‐vis diffuse reflectance spectra (DRS). The photocatalytic activities of these AgCl/BiOCl composites were evaluated by the degradation of rhodamine B (RhB) under UV and visible light. The results revealed that the BiOCl/AgCl with an initial 100:1 mole ratio of Bi to Ag have the highest photocatalytic activity. RhB (20 mg/L) was decolorized by 98.81% in 15 min under sun light, in contrast to 95.89% and 11.63% in 30 min under halogen lamp and UV light, respectively. The catalysts did not show any significant loss of activity after 19 recycles for the photodegradation of RhB, suggesting the photocatalyst is essential stable. Kinetic studies showed that the RhB photocatalytic degradation followed pseudo-first order kinetics reaction and fit the Langmuir-Hinshelwood kinetic equation. The rate controlling step was absorption reaction.
Effect of Rare Earth Metals on Microstructure and Impact Property of Duplex Stainless Steel
Authors: Liu Xiao , Liang Jing Long
Published: March 2013

The effect of rare earth element on structure and mechanical properties of 2205 duplex stainless steel were studied by metallographic examination, scanning electron microscope (SEM), tensile test and impact test. The results show that the proper amount of rare earth can refine microstructure of 2205 duplex stainless steel. Fracture is changed from cleavage to ductile fracture by adding RE to 2205 duplex stainless steel. 2205 duplex stainless steel containing 0.05% RE can improve its impact toughness, and the transverse impact toughness is increased 15.56% at -20°C respectively comparing with that of 2205 duplex stainless steel without RE.
Fretting Damage Analysis and Research on Pipe Thread
Authors: Yang R.J.
Published: March 2013

The connected pipe thread will be loosed under the pressure impact and vibration effects. Based on the analysis of the sealing mechanism of pipe thread, the essence of the pipe thread loosening is caused by fretting damage and fatigue. The following three methods are used to reduce the damage: the processing requirements of internal and external screw thread tooth type and size will be improved；the deformations which are made by a screwing torque to the external thread of the material itself will fill the gap in each part after internal and external screw thread are screwed together;plasticity sealing filler are put between internal and external screw thread.
Geological Characteristics of Ag-Pb Deposit in A He Lan, XinJiang
Authors: Peng Hua Ming , Guo Fu Sheng , Xia Fei , Zhang Wan Wan
Published: March 2013

The Ag-Pb Deposit in A He Lan was located in the eastern of the East Kunlun with complex structure, strong magma activity and rich mineral resource. The silver lead-zinc bodies were hosted in Yanshanian biotite adamellite (Jηγ) and blackmica granite diorite (Jγδ) and controlled by the fracture zone. The orebodies produced in vein and lenticular with a length of 200m-820m, the average thickness of 0.42m-6.77m. The ore minerals were mainly galena and limonite and the gangue minerals were quartz, feldspar and biotite. The ore textures mainly contained xenomorphic granular, metasomatie-relict, entrapped, interspersed and cataclastic etc. And the major structures were crumb(granular), veinlet and block in the ore area. The ores were the zinc-lead-silver type rich in lead-silver and poor in zinc. The surrounding rocks were biotitemonzogranite (Jηγ) and the stones were the biotitemonzogranite cataclasite and breccia.
Structural and Electrical Properties of High C-Orientation GaN Films on Diamond Substrates
Authors: Ma Cheng Jiu , Zhao Li , Yu Tong Wei , Sun Xin
Published: March 2013

Preferred orientation GaN films are deposited on freestanding thick diamond films by electron cyclotron resonance plasma enhanced metal organic chemical vapor deposition (ECR-PEMOCVD). The TMGa and N2 are applied as precursors and different N2 flux is used to achieve high quality GaN films. The influence of N2 flux on the properties of GaN films is systematically investigated by x-ray diffraction analysis (XRD), atomic force microscopy (AFM), electron probe microanalysis (EPMA) and Hall Effect Measurement (HL). The results show that the high quality GaN films deposited at the proper N2 flux display a fine structural and electrical property and the Ga/N atomic ratio plays an important role in the electrical property of GaN films.
The Effect of Different Turbulence Models on the Emitter Discharge by Using Computational Fluid Dynamics
Authors: Lu Gang , Yan Qing Song , Lu Bai Ping , Xu Shuai , Li Kang
Published: March 2013

Four types of Super Typhoon drip emitter with trapezoidal channel were selected out for the investigation of the flow field of the channel, and the CFD (Computational Fluid Dynamics) method was applied to simulate the micro-field inside the channel. The simulation results showed that the emitter discharge of different turbulent model is 4%-14% bigger than that of the experimental results, the average discharge deviation of κ-ω and RSM model is 5, 4.5 respectively, but the solving efficiency of the κ-ω model is obviously higher than that of the RSM model.
Accurate Solutions to Nonlinear Vibration of Single-Walled Carbon Nanotube via Homotopy Perturbation Method
Authors: Ma Xin Mou , Chang Lie Zhen
Published: March 2013

In this study, analytical solutions are obtained by homotopy perturbation method (HPM) for the nonlinear vibration equation of single-wall nanotube (SWNT). Novel and accurate analytical solutions for the frequency and displacement are derived. Comparison of the result obtained by the HPM with exact solutions reveals that only the first or second order approximation of the HPM leads to higher accurate solution.
Working Qualifications and Dynamic Analysis of Brake Wheels on a Flexible Squirm Pipe Robot
Authors: Feng Wen Long , Zhang Yan Heng , Song Jing Zhou
Published: March 2013

In order to establish a flexible squirm pipe robot’s mechanical model and find an appropriate method to improve its moving performance, the working qualifications and dynamic analysis of brake wheels are made. Proceed with the robot's moving mechanism, the squirm principle and mechanical qualifications of the robot’s brake wheels are analyzed, and the model of the robot’s traction is derived. Based on that, the prototype is made. Finally, the validity of the design and theories is verified by experiments.