bluuebunny/crossref_metadata_2025 huggingface dataset:
Femtosecond Laser Micro-Nanofabrication Technology and its Experimental System
Authors: Lin Ren , Zhong Zi Jing , Wang Chun Yu , Hao Xue
Published: September 2013

In this paper,a 3D femtosecond laser micro-nanofabrication system has been built. CAD model of 2D picture conversion data based on femtosecond laser micro-nanofabrication system have been also discussed. At last, the 2D hand model has been fabricated using the fabrication system we have built.
The High-Speed Video Signals Fiber Transmission Design Using of Optical Fiber in Photoelectric Tracking Equipment
Authors: Zhong Zi Jing , Liu Guang Dong , Yu Ying , Chen Chao
Published: September 2013

To improve the quality of the signal transmission and increase the bandwidth in the photoelectric tracking equipment, a kind of mixed transmission design of low-speed digital signals and high-speed digital video signals in use of optical fiber has been carried out. And in the system the high-speed parallel and serial transmission cells realizes the serial and de-serial of the digital video signals in use of the Agilent chip of HDMP-1032/1034, the optical fiber transmits the high-speed optical signals as the transmission media. The signal transmission bandwidth can be up to over 500MHz in use of optical fiber, otherwise the signal transmission quality and environment adaptability has been improved greatly.
Study of Edge Emission and its Induced Photo Pumping by Using Microcavity Organic Light Emitting Diodes
Authors: Xu Hong Guang , Ran Feng , Ji Yuan , Wei Bin , Zhu Wen Qing
Published: September 2013

The authors have investigated the edge emission of microcavities which are formed by low-molecular organic light emitting diodes sandwiched between dielectric mirrors and the metal cathode. The edge emission relative to the surface emission is found to significantly depend on the layer number of alternating high and low refractive index films in dielectric mirrors. The enhancement of cavity devices can reach a factor of ~3.0 compared with noncavity devices. Spectra of organic film pumped by edge emission of microcavity devices have been observed, a mechanism of achievement of an amplified spontaneous emission has been discussed theoretically.
Study on the Electromagnetic Responses of Split Ring Resonator in THz Regions
Authors: Xu Wei Kai , Tang Ying Chun , Wang Wei
Published: September 2013

By using the numerical simulation techniques, the response characteristics of single split-ring resonator (SRR) in a broadband terahertz region are analyzed. We examine the transmission and dispersion characteristics of the SRR and show that there are different resonances while changing the orientations of electric field vector relative to the gap-bearing sides. Two significant resonances corresponding to electric response and magnetic response will be observed while the electric field vector perpendicular to the gap-bearing side, and only one electric resonance occurs when the electric field vector parallel to the same side. This will be a reference to design the possible terahertz metamaterials.
SNR Estimation of OFDM Adaptive System in Gauss Channel
Authors: Shi Yan Li , Ren Lin , Yu Hai Xia , Song Yang
Published: September 2013

The technology of OFDM is a multi-carrier technology, and it is a kind of high efficient modulation technique, it has the ability of strong anti multi-path propagation and frequency selective fading, and higher frequency spectrum utilization rate, this technology is applicable to high speed data transmission in the multi-path and fading channel environment. This paper introduces the basic principle of OFDM adaptive system, and the SNR estimation of OFDM adaptive system in Gauss channel through the simulation, this is a theoretical foundation to practical application in the future.
Development of Ammonia Gas Sensors with PPy Films on Base of Mg2SiO4 Porous Ceramics for Better Behavior of Chemo-Electrical Relationship
Authors: Ye He Lan , Xiong Zhao Xian , Xue Hao , Qiu Hong , Song Chun Xiao
Published: September 2013

A new kind of gas sensors were prepared via chemical polymerization of polypyrrole (PPy) as sensitive layer on base of Mg2SiO4 porous ceramics. Thermal stability of the PPy sensitive layer was characterized with thermogravimetric analysis, including TG and DTA. Chemical structure of the samples was identified with X-ray diffraction (XRD) analysis. Microstructure of the PPy film was observed by a scanning electron microscope (SEM). Chemo-electrical relationship of the gas sensors was investigated with the resistance variation of PPy films at different gas concentrations. Based on series of experimental results, linear behavior of the chemo-electrical relationship was obtained for the gas sensor, y=0.00344x+1.33754, with R2=0.9734.
An Adaptive Acquisition Algorithm of GNSS Receiver
Authors: Gao Fa Qin , Shi Jia Dong , Gu Xiao Wei , Zhang Ke
Published: September 2013

The application of GNSS is very extensive now and soft-radio technology based GNSS receiver is the trend of GNSS receiver product. In which the function of GNSS sigal acquisition is completed by running software and it will impact the performance of the receiver. Now, there are lots of achievements about GNSS sigal acquisition algorithm,but those achievements have big limitations such as the parameters of acquisition algorithm cant be adjusted according to the running condations adaptively and it cant give attention to two or morethings such as speed and sensitivity. Therefore,a algorithm that can adjust parameters of GNSS sigal acquisition algorithm adaptively according to running condations is put out in this paper. Finally, It is testified that the algorithm put out can give attention to two or morethings such as speed and sensitivity.
Splitting and Filtering Properties of Defect-Mode in One-Dimensional Photonic Crystal
Authors: Peng Jian Kun , Han Yan Ling , Wang Hong
Published: September 2013

By the Transfer Matrix Method (TMM), the properties of defect modes, such as splitting, coupling and filtering, have been researched in detail. The influence of refractive index and incident angle on the defect-mode coupling has been investigated. Simulating results exhibit that coupling mode split as two defect modes when they are close to each other. This property is closely related to the refractive index and the spacing interval between defect layers. The incident angle can reach 30 degree, which has a potential application in full angle filtering.
A New Two-Dimensional Photonic Crystal Channel Drop Filter Based on Two-Resonant Cavities
Authors: Hu Ying , Liu Gui Qiang , Zhang Xiang Nan , Cai Zheng Jie
Published: September 2013

In this paper, a channel drop filter (CDF) is composed of two cubic lattice circular ring resonator cavities and point micro-cavities in a two-dimensional photonic crystal. The photonic band gap is calculated using the plane wave expansion (PWE) method and the optical characteristics of proposed structure are studying by the finite difference time domain (FDTD) method with perfectly matched layers (PMLs) acting as the boundary conditions . Two different wavelengths centered at 1773 nm and 1742 nm have been successful separation in this CDF. These demonstrate that our proposed structure is suitable for photonic integrated circuits (PICs) and coarse wavelength division multiplexing (WDM) optical communication systems.
Oxygen Sensor Based on Tunable Diode Laser Absorption Spectroscopy with a Vertical Cavity Surface-Emitting Laser
Authors: Gao Yan Wei , Zhang Yu Jun , Chen Dong , He Ying , You Kun , Zhou Yi , Liu Jian Guo , Liu Wen Qing
Published: September 2013

Oxygen plays a fundamental role in nature and industrial process, the fast on-line oxygen concentration detection is of great significance. Tunable diode laser absorption spectroscopy (TDLAS) is capable high selective, high sensitive, non-intrusive, this technique exploits the diode laser tunable and narrow bandwidth characteristics, by selecting one absorption line of the target gas to avoid interference from other gas and realize oxygen concentration fast on-line detection. In this paper, we use vertical cavity surface-emitting laser (VCSEL) as the light source, adopting the wavelength modulation spectroscopy and the harmonic detection technology to measure the second harmonic signal and realize oxygen concentration fast on-line detection. The detection concentration range between 0.1% to 40% and detection accuracy is 0.1%.
Fabrication of 3D Photonic Crystals of Non-Magnetic Ellipsoids with Different Aspect Ratio
Authors: Huang Kuan , Liu Gui Qiang , Chen Yuan Hao
Published: September 2013

This paper introduces a method of preparation of photonic crystals with non-magnetic ellipsoid as building blocks. Under the condition of above its glass-transition temperature, monodispersed polystyrene (PS) spheres with the diameter of 260 nm and 360 nm were respectively elastic stretched by applying external force with different values to get different ellipsoids with different aspect ratios. The assembly procedure was carried out by applying the vertical deposition self-assembly method in a magnetic field under the guidance of magnetic fluids. In this paper, We report the crystalline structure with long range order.
The Application of Non-Destructive Testing Based on Terahertz Technology in the Field of Smart Grid
Authors: Li Xiao Juan , Wang Ming , Liang Xiao Bin , Zhao Xian Long , Zhao Ming Fei
Published: September 2013

The terahertz technology involves electromagnetics, semiconductor physics, optoelectronics, materials science and micro-processing technology and other disciplines. Based on terahertz technology, non-destructive testing has important research value and application prospect in the field of medical imaging, security checking, product testing and power system monitoring. The generation of terahertz technology and its advantages is described in this article, and an analysis is also given on the application of non-destructive testing based on terahertz technology in the field of smart grid such as cable accident warning, intelligent anti-theft system and electronic components monitoring.
Multiple Healing Fatigue Damage by Laser Shock Peening for Copper Thin Film
Authors: Jin Jia , Shang De Guang , Liu Xiao Dong , Zhang Li Hong , Guo Yu Bo , Chen Tao
Published: September 2013

Multiple healing fatigue damage for polycrystal copper film was investigated by laser shock peening (LSP). The damaged specimens were healed several times under the optimal laser parameters. The relationship among the fatigue life, healing times and the damage degree were investigated. The experimental results showed that the multiple heal based on LSP can maximize fatigue life of the damaged specimens under the definite optimal condition with the obtained at damage degree of 0.4 and healing times of 3, in which nearly 4.6 times increase in residual fatigue life for the damaged specimens, and 7.8 times increase in the accumulated fatigue life.
Mechanism of Plasma Radiation Optics-Ammunition Inspired by Electrically Exploding Wires
Authors: Zhao Xuan Ke , Zhao Qing Wu
Published: September 2013

In this paper, a new mechanism of plasma radiation optics-ammunition inspired by electrically exploding wires blasting in inert gases is studied. The simulation results indicate that, plasma radiation intensity increased by Mach-number of shock waves, and in all insert gases, argons Mach-number of shock waves is the highest. Silver is the best in common metal materials, and the exploding time and current peak is about linear with the number of wires. And the simulation results agree with the known experiment data and are important to the study of strong pulsed IR optics-ammunition.
Equivalent Luminous Efficiency - A Normalization Index to Luminous Efficiency of Luminaries
Authors: Zhao Hai Tian , Hu Yan Peng , Yao Qi
Published: September 2013

The luminous efficiency do make four impact factors confused such as existing of dissipated light, ability for transmission of lighting sources, distortion of visual effects and different values of power choosing during the luminous efficiency comparison under its current definition. In this paper, the equivalent luminous efficiency was introduced based on the discussion of these factors which maintains the form of current definition of luminous efficiency while it sets the equivalent coefficient to make test results comparable under different measurement conditions, so as to be clear when we compare and evaluate the properties of energy-saving and luminescence of luminaries.
New Dual-Mode FSE Suitable for High-Order QAM Signals
Authors: Gao Hui Juan , Liu Yan
Published: September 2013

In the digital transmission system, constant modulus algorithm (CMA) is a famous blind equalization to overcome the inter-symbol interference without the aid of training sequences. But for the non-constant modulus signals such as higher-order QAM signals, the CMA just achieve moderate steady-state mean square error (MSE). So a new dual-mode fractionally-spaced equalization (FSE) suitable for high-order QAM signals is proposed, which makes full use of the character which is that the high-order QAM signals have the different modulus. This algorithm uses the FSE based on CMA as the basal mode and in the second mode it uses the FSE based on variable modulus algorithm. The simulation results show that compared with CMA the proposed algorithm has faster convergence rate and lower steady-state mean square error.
Photoluminescence Properties of Europium Complexes Encapsulated into MSBA-15
Authors: Li Su Wen , Yue Ming
Published: September 2013

The Eu complexes-Eu (TTA)3phen (TTA: thenoyltrifluoroacetone, phen: 1,10-phenanthroline) were encapsulated, uniformly distributed into the channels of the modified SBA-15 (labeled with MSBA-15), and structurally characterized. The photoluminescence properties of the encapsulated complexes were systematically studied in contrast to the pure complexes. The results indicate that the excitation bands assigned to the π-π* electron transition of the ligands for Eu3+ complexes in encapsulated complexes were split into different components, and the 5D0-7F0 transitions became partly allowed. The emission lines for the 5D0-7F2 transitions became broader and the relative intensity for different crystal field components varied greatly in comparison to the pure complex. Most importantly, the photostability and thermostability of the emissions improved considerably.
Research on Three Fierce Exploders Reflected Terahertz Spectrum
Authors: Wang Gao , Yao Jian Quan , Xu De Gang , Wang Gao , Ren Xiao Fang
Published: September 2013

The rapid development of the Terahertz technology has been the essential focus among all application fields. In order to applying the spectral technology to the security and analyzing all exploders spectrum characteristics, the paper aims to three exploders spectrums researches including the HNS, DNMT and DNAN. The three reflected spectrums are tested and analyzed, using the most advanced portable terahertz spectrometer, and the absorption peaks among 0.1~2.5THz are determined successfully.
Next-Generation ROADM Architecture and Technologies
Authors: Huang Hai Qing , Li Wei Min , Ren Wen Yi
Published: September 2013

The main architecture of the next generation ROADM has its "colorless"," Directionless" and "Contentionless" characteristics. The Wavelength Selective Switch (WSS) module technology includes the microelectromechanical-systems (MEMs), Planar lightwave circuit (PLC) and liquid crystal on silicon (LCOS) based technology.
A 2.4 GHz Low Voltage Low Power Folded Down-Conversion Quadrature Mixer Design
Authors: Li Ming , Li Zhi Qun , Wu Chen Jian , Zhang Meng , Cao Jia , Wang Zeng Qi
Published: September 2013

This paper introduces a 2.4 GHz down-conversion quadrature mixer which applied in the Wireless Sensor Network (WSN). The mixer uses a folded structure which is modified based on the conventional Gilbert mixer. It is designed in 0.18μm RF CMOS process with a low supply voltage of 1V. The post-simulation results show that the mixer achieves a conversion gain (CG) of 9.0dB, the input 1dB compression point (IP1dB) of-7.6dBm, the third-order input intercept point (IIP3) of 2.2dBm, and the single side-band (SSB) noise figure (NF) is 13.9dB. The mixer core consumes current about 1.2mA from a 1V power supply.
Design of Low Voltage Low Power LPF for WSN Node
Authors: Lin Yang , Li Zhi Qun , Wu Chen Jian , Zhang Meng , Wang Zeng Qi
Published: September 2013

A fourth-order low-pass continuous-time filter for a WSN transmitter is presented. The active RC filter was chosen for the high linearity, designed by using the leapfrog topology imitates the passive filter. The operation amplifier (op-amp) adopted by the filter is feed-forward operation amplifier, which could get the GBW as large as possible under the low power consumption. The cut-off frequency deviation due to the process corner, aging and temperature deviation is adjusted by an automatic frequency tuning circuit. The filter in a 0.18μm RF CMOS technology consumes 1mW from a 1V power supply. The measured results of the chip show that the bandwidth is about 1.5MHz. The voltage gain of filter is about-4.5dB with the buffer, the ripple in the pass-band is lower than 0.5 dB, and the channel rejection ratio is larger than 30dB at 4MHz.
A 2.5GHZ-2.7GHz Unsymmetrical Doherty Power Amplifier with Digital Predistortion for LTE-Advanced Applications
Authors: Pan Wen Sheng , Ma Chuan Hui , Shao Shi Hai , Tang You Xi
Published: September 2013

An unsymmetrical GaN based Doherty power amplifier (DPA) operating from 2.5GHz to 2.7GHz is presented in this paper. To achieve a good tradeoff among the output power, efficiency and bandwidth, the ladder-type multisection output matching networks are optimized for the carrier amplifier and the peaking amplifier, respectively. Measured with continuous wave (CW) signal, the broadband DPA provides more than 49dBm saturation power in the operating band. The drain efficiency is greater than 44% over 7dB back-off power. For a LTE-Advanced signal with 100MHz bandwidth, the drain efficiency is higher than 42% at an average output power of 41dBm, along with an adjacent channel leakage ratio (ACLR) of better than-49.9dBc after digital predistortion (DPD).
Design of Low Voltage Low Power ADC for WSN Node
Authors: Ren Si Kui , Li Zhi Qun
Published: September 2013

This paper presents a low power low voltage 7bit 16MS/s SAR ADC (successive approximation register analog-to-digital converter) for the application of ZigBee receiver. The proposed 7-bit ADC is designed and simulated in 180nm RF CMOS technology. Post simulation results show that at 1.0-V supply and 16 MS/s, the ADC achieves a SNDR (signal-to-noise-and-distortion ratio) and SFDR (Spurious Free Dynamic Range) are 43.6dB, 57.4dB respectively. The total power dissipation is 228μW, and it occupies a chip area of 0.525 mm2. It results in a figure-of-merit (FOM) of 0.11pJ/step.
Multi-Plane 3-D Holographic Image Fusion in DCT Domain
Authors: Zhou Hao , Gu Ji Hua , Chen Da Qing
Published: September 2013

An improved multi-plane imaging fusion algorithm for 3-D digital holography is presented. Multiple reconstructed images at different distances from single off-axis Fresnel digital hologram are fused using discrete cosine transform (DCT) with different blocks. The zero order term is removed using a Laplacian operator while the conjugate image and dispersed images of defocused objects are eliminated by selecting a simple rectangular window before image fusion. Compared with those fused images obtained directly from the reconstructed images, the fused images qualities are greatly improved and all of the objects will be clearly in focus more quickly than discrete wavelet (DWT) based fusion method.
Simulation System of Atmospheric Transmission Attenuation Effect for Mid-Wave Infrared Radiation
Authors: Zhang Fei , Wu Ze Bin , Ye Shun
Published: September 2013

Considering the limitation of maneuverability and real-time performance of the common atmosphere transmission calculation software, a simulation system of atmospheric transmission attenuation effect for mid-wave infrared radiation is designed in this paper. Firstly, the atmospheric transmission attenuation effect for mid-wave infrared radiation is studied. Then an approximate model for atmospheric transmission attenuation effect for MWIR is established based on theoretical approaches and empirical formula. The process of simulation system of atmospheric transmission attenuation effect for MWIR is designed, and corresponding simulation system is implemented. Finally, the comparative experiments with MODTRAN are carried out to validate the performance of the simulation system, and experimental results show that it gives a very good agreement between the calculated results within an attitude of 3 km. In addition, this system has higher performance in real-time compared with Modtran.
A Novel Loophole-Free Minimum Overlap Model
Authors: Huang Ya Qun , Li Hai Yan
Published: September 2013

A loophole-free minimum overlap model is proposed to calculate the minimum repeaters under the condition of complete coverage and accommodating a certain number of simultaneous users. We first employ the Pulse Code Modulation to calculate the bandwidth occupied by each user. Subsequently, by taking the spectrum division and Frequency Division Multiple Accesses (FDMA), we produce the maximal number of person available to one repeater. Finally, we estimate the loophole-free minimum overlap model to yields the minimum number of repeater. The experiment result shows that the proposed method is practical and effective.
Delay Statistics for ARQ Protocols over Network-Coded Cooperative Networks
Authors: Yan Yuan Yuan , Huang Sheng Ye , Li Xiu
Published: September 2013

This paper presents a queuing analysis method for automatic repeat request (ARQ) in network-coded cooperative transmission networks with dynamic radio link adaptation. An equivalent Nakagami-m channel model is derived for the network-coded cooperative system and a Finite State Markov Chain (FSMC) is modeled for conducting queuing analysis of packet transmission. Finally, the matrix geometry method is used to get the steady state probability distribution and delay statistics. Numerical results show that as the network coding method reduces the feedback delay, the corresponding total delay has a relatively decrease.
Video Quality Evaluation for H.264 Video Streaming over Wireless Networks
Authors: Liu Li Qiang , Wang Yue Bing , Yan Quan Feng
Published: September 2013

With the rapid development of computer technology and wireless network communication technology, video encoding technology will be more and more widely applied in the limited resources of the wireless network. Due to the large amount of data of the video transmission , transmission quality of transmit video on the wireless network are varied with different compression parameters, network parameters and network conditions. Simulation results show that the transmission of video over wireless networks, must be based on the current network conditions, choosing the suitable GOP length and quantitative parameters to get the high image quality. In specific applications, network topology, network bandwidth, routing technology and transmission of packet segmentation scheme and other factors will affect the quality of service for video services.
Communication Performance Research for Online Video over Wireless Multimedia Network
Authors: Wang Yue Bin , Liu Li Qiang , Yan Quan Feng
Published: September 2013

This paper analyzed the communication performance to implement video coding and transmission in the limited resources of wireless network. Meanwhile, the effect of GOP, quantification and loss probabilities to transmission quality in multimedia communication is discussed, and the correlation between those relevant parameters and transmission quality of multimedia video is analyzed by simulation. The simulation results show that the transmission quality of multimedia video in wireless network varies with the compression parameters, network parameters, and network conditions. Thus, video transmission over wireless network, it should consider the network conditions, as well as appropriate length of the GOP and quantification parameters for better reconstructed images.
Heterogeneous Communication Architecture to Enable Demand Response Management for the Smart Grid
Authors: Sun Zhong Wei
Published: September 2013

Demand response entails the control of the energy demand and loads during critical peak situations to achieve a balance between electrical energy supply and demand. A robust communication infrastructure, which consists of network components of Home Area Networks (HANs) and Neighborhood Area Networks (NANs) is the touchstone to achieve the demand response goals. This paper surveys existing communication technologies that can be adopted for demand response applications. A heterogeneous communication architecture based on Wireless Sensor Networks (WSNs) and Ethernet Passive Optical Networks (EPONs) is presented, and the reliability and scalability requirements of communication system is satisfied.
How to Design Mobile Advertising: A Field Experiment with Wireless Telecommunication Technology
Authors: Wang Jue , Xu Yan Yan , Xue Jiao Long , Fang Zheng
Published: September 2013

Although mobile advertising seemingly offers practitioners tremendous potential given the ubiquitous nature of reaching subscribers anywhere, we know very little about it. Base on field experiment data, the developed zero-inflated Poisson model reveals that distance, promotion and product type could affect sales impact of advertising while using wireless telecommunication technology. When estimating the model, we use latent instrument variable (LIV) approach to rule out possible endogeneity problem. The empirical results indicate that distance, promotion, product type trigger sales respectively, while only promotion increases sales amount.
Application of Ontology Engineering in Satellite Network Simulation
Authors: Lin Qi , Chen Yong
Published: September 2013

Existed simulation works are always too dependent on a kind of particular techniques or tools to perform horizontal comparison and integration. There is no formal description for the simulation objects which leads to the lack of semantic support in the simulation. In order to guarantee the reusability and interoperability of heterogeneous models and services in satellite network simulation and provide verification support, a method based on ontology engineering is proposed. Based on the concept of simulation verification with semantic support, the purpose and requirements of applying ontology engineering in satellite network simulation are identified. A test is performed as to a specific simulation task, and the results show that, besides the semantic support, the former method can provide significant improvement in efficiency, which is over 200% in comparison with the latter one. It is concluded that it is quite feasible to apply ontology in the area of satellite network simulation.
Multi-Agent Based Modeling Simulation about VANET
Authors: Wan Shan Shan , Wang Dong Liang , Cao Qing
Published: September 2013

The self-organization characteristics and the interaction between a large numbers of self-organizing vehicles are complexity, to obtain a more accurate model of vehicular Ad-hoc network (VANET) and obtain a more profound comprehension of the complex behavior working mechanism of the vehicle in the VANET environment multi-agent based and bottom-up modeling approach is proposed here. It aims to describe the dynamics of VANET caused by the different behaviors of vehicular. The simulation tool for vehicular misbehaviors is developed with multi-agent. It aims to and be able to effectively reproduce the real VANET scene. Though the multi-agent based modeling the emergent behavior and sudden existing behaviors of VANET entities are well reflected.
Novel DFE for Underwater Acoustic Channels
Authors: Liu Yan , Li Yuan Min
Published: September 2013

In underwater acoustic communication systems, the channel equalization community has recently given much attention to decision feedback equalization (DFE). It is because that the DFE offers intersymbol interference (ISI) cancellation with reduced noise enhancement. However, its key algorithm such as constant modulus algorithm (CMA) has moderate convergence rate and steady-state mean square error (MSE), which is not sufficient for the receive system of communication. So a new cost function is defined and then a novel DFE based on such cost function is proposed. The efficiency of the proposed DFE is proved by computer simulations.
Structures and Properties of BiFeO3 Thin Films on Pt(111)/Ti/SiO2/Si Substrates Prepared by Pulsed-Laser Deposition under Various Oxygen Partial Pressures
Authors: Yi Mei Lin , Wang Chuan Bin , Shen Qiang , Zhang Lian Meng
Published: September 2013

Ferroelectric BiFeO3 (BFO) thin films were prepared on Pt (111)/Ti/SiO2/Si substrates by pulsed-laser deposition under various oxygen partial pressures (PO2). The effects of PO2 on the phase, orientation, surface morphology, and ferroelectric properties of the films were investigated, particularly in regard to relationships between structure and properties. It was found that the crystallographic orientation and surface morphology of the BFO thin films strongly depended on PO2. Films prepared at PO2=10 Pa had a high degree of (111) orientation and densely packed grains. A maximum of twice the remanent polarization for the BFO thin film was 68 μC/cm2.
Spectroscopic Properties Calculation of some 1, 8-Naphthalimide Derivatives
Authors: Qi Qi , Qi Fan , Wang Yu Qiao , Qi Zheng Jian , Sun Yue Ming
Published: September 2013

The absorption and emission spectra of 1,8-naphthalimide derivatives have been calculated by time-dependent density functional theory. Their lowest singlet transition states can be described as the promotion of electrons from the HOMO to the LUMO. Substituents on naphthalimic ring seldom extend the conjugation of the central naphthalimic system.
Facile Synthesis of PtAu Nanoparticles/Graphene Nanocomposites for Direct Electrochemistry and Electrocatalysis
Authors: Lu Li Min , Zhang Ou , Nie Tao , Xu Jing Kun , Zhang Kai Xin , Wu Li Ping , Wen Yang Ping
Published: September 2013

PtAu bimetallic nanoparticles (NPs) were successfully synthesized on single-stranded DNA functionalized graphene nanomaterials (ss-DNA/GR) via a simple chemical reduction method. The nanocomposites (PtAu/ss-DNA/GR) were characterized by transmission electron microscopy (TEM), energy-dispersive X-ray spectrometer (EDS) and electrochemical techniques. Then a sensitive dopamine (DA) sensor was fabricated based on PtAu/ss-DNA/GR nanocomposites modified glassy carbon electrode (GCE). The results of electrochemical experiments demonstrated that the sensor exhibited excellent electrocatalytic activity to the oxidation of DA. The sensor displayed wide linear detection range from 8.0×10-8 to 1.0×10-5 M and 1.0×10-5 to 5.0×10-5 M and a low detection limit of 1.0×10-8 M (S/N = 3). In addition, the sensor also showed high selectivity, good reproducibility and stability for DA detection. Thus, it is considered to be an ideal candidate for practical application.
Preparation and Kinetic Property of Iron-Doped TiO2 Nanoparticles
Authors: Li Qing
Published: September 2013

nanoTiO2 photocatalyst powders were prepared through the sol-gel method and with supercritical fluid drying (SCFD). The SEMXRD and particle size distribution technique were used to characterize the hyperfine TiO2 particles.The reaction of photo-catalysis for methylene blue is in conformity with the first order kinetic law in appearance within the concentration range between 5mg/L and 15 mg/L. As the initial concentration methylene blue in water increase, the appearance rate constant of the reaction decreases while the half-life period of the reaction increases.
The High Temperature Creep Behavior of Mg-5Li-3Al-2Zn-2Cu Alloy
Authors: Li Ting Qu , Liu Xiang Ling , Cao Zhan Yi
Published: September 2013

The room-temperature mechanical properties of the extruded Mg-5Li-3Al-2Zn-2Cu alloy (LAZ532-2Cu) were researched previously. In this paper, the creep behavior of the extruded LAZ532-2Cu alloy was studied at the temperature range from 398K to 448K, with the stress 60MPa, 80MPa and 100MPa. The microstructure of the alloy consists of the matrix α-Mg solid solution and the intermetallic compounds on the grain boundary or in the grain. The microstructural analysis of the alloy reveals the correlation between microstructure and creep properties. The stress exponent n 3.72, 4.8, 6.1, the activation energy Qc 94.8kJ/mol, 123.9kJ/mol, 128 kJ/mol were calculated at the test condition. The creep test samples were combined with detailed transmission electron microscopy and X-ray diffractometry in order to characterize the precipitated AlLi phase, which contributes to the creep resistance by obstructing the dislocation movement in dislocation creep.
Influence of Calcined Temperature on the Piezoelectric Properties of (Na0.48K0.47Li0.05)NbO3 Lead-Free Piezoelectric Ceramics Doped with CuO
Authors: Huang Xin You , Huang Mu Sheng , Gao Chun Hua
Published: September 2013

Na0.48K0.47Li0.05)NbO3(NKLN)Lead-free piezoelectric ceramics doped with CuO were prepared by traditional solid-state reaction method. Influence of calcined temperature on the material phase of NKLN lead-free piezoelectric ceramics doped with CuO by X-ray diffraction (XRD) and the influence of calcined temperature and sintered temperature on the properties of NKLN lead-free piezoelectric ceramics doped with CuO by others analysis method. The results show that the best calcined temperature is got, when calcined temperature is up to 850 °C, the mixed phase disappeares, a single phase perovskites structure is formed. With the increase of calcined temperature, piezoelectric strain constant (d33) planar electromechanical coupling factor (Kp) of NKLN lead-free piezoelectric ceramics increase first and then decrease, while only dielectric loss (tanδ) decreases first and then increases.The best calcined temperature is 850 °C, the best sintered temperature is 1080 °C, the NKLN lead-free piezoelectric ceramics doped with CuO with good comprehensive properties are obtained, whose d33 , Kp , tanδ are 85 pC/N, 0.3, 0.038, respectively.
Dielectric Properties of CaTiO3 Doped Ba0.65Sr0.35TiO3 (BST) AC High Voltage Capacitor Ceramics
Authors: Huang Mu Sheng , Huang Xin You , Gao Chun Hua
Published: September 2013

The dielectric properties of (1-x) Ba0.65Sr0.35TiO3-xCaTiO3(x=0, 0.03, 0.06, 0.10, 0.15) ceramics were investigated. XRD analysis shows that CaTiO3 doping can be fully incorporated into the perovskite lattice of BST except increasing peak intensity. The experimental result shows that doping a certain amount of CaTiO3 could form fine crystal grain structure, enhance the density, and enhance Ac withstand voltage strength, increase dielectric constant and decrease the dielectric loss. While doping excessive CaTiO3 could make the geometrical distortion, increase the porosity and grain size, develop the internal stresses and finally lead to the dielectric constant decrease. The BSTC ceramics sintered at 1350 °C for 2 h with 6 mol.% CaTiO3 doping has the best properties, εr of 3862, tanδ of 0.046, Eb of 5 kV/mm (AC), the value of C/C ranges is-26.7%~-66.2% in-50 °C ~ 100 °C temperature range.
Influence of Titanium Ion Doped Amount on the Dielectric Property of BMNT Ceramics
Authors: Huang Xin You , Zuo Yuan , Gao Chun Hua
Published: September 2013

Bi2(Mgl/3Nb2/3-xTix)2O7(BMNT)(x=0.1, 0.15, 0.2, 0.25) ceramics was prepared by conventional solid phase method, The influence of titanium ion doped amount on the dielectric property and microstructure of BMNT ceramics were systematically studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and other testing and analysis how to methods. Results show that there is single monoclinic pyrochlore phase and there is not the second phase in all BMNT ceramics doped with titanium ion. The grain size of BMNT ceramics increases first and then decreases, the dielectric constant (εr) increases first and then decreases, the dielectric loss (tanδ) increases first and then decreases, the ceramic density decreases all the time while titanium ion doped amount increases. The ceramic density increases first and then decreases when sintered temperature increases. The density of BMNT ceramics doped with titanium ion is biggest when sintered temperature is 980 °C. When sintered temperature is 980 °C and titanium ion doped amount is 0.15mol, the dielectric properties of BMNT ceramics is good,which εr is 135(1MHz), tanδ is 0.002(1MHz) and volume density is 7.46g/cm3.
Role of Sputtering Power on the Structural and Optical Properties of ZnO/SiO2 Films Deposited by Radio Frequency Magnetron Sputtering
Authors: Li Shuang , Chen Ming , Wang Feng Xiang
Published: September 2013

In the present work, we investigated the effect of sputtering power on the structural and optical properties of ZnO films by radio frequency (rf) magnetron sputtering. Atom force microscopy (AFM), X-ray diffraction (XRD) and Prism coupling method were adopted to investigate the structure and optical properties of ZnO thin films deposited by sputtering powers in the range from 100~150W. XRD and AFM results shown that ZnO films with high c-axis preferred orientation crystalline structures have been successfully deposited under higher sputtering power condition. Moreover, it was also found that the indexes refractive of the films obtained by higher sputtering power are less than that of the bulk ZnO materials, which is closer to Crystal Refractive index.
New Type Intellectualized Clothing Materials-Color-Changing Materials
Authors: Zhang Miao , Wang Xue , Sun Qin Fei
Published: September 2013

This article mainly introduces the manufacture and application principle of photosensitive color-changing fiber and thermosensitive color-changing fiber in clothing color-changing materials so as to let people better understand them.
A Method for Eliminating Zero-Order Image in Digital Holograph Based on Contourlet Transform
Authors: Zhang Yu Fei , Wu Yi Quan
Published: September 2013

In the reconstruction process of digital holograph, zero-order image has a bad impact on the quality of real image. In this paper, a new way to eliminate zero-order image in digital holography is proposed. Firstly, digital holography image is decomposed by contourlet transform, then remove the low frequency. The new digital holography image is obtained by inverse contourlet transform. Experiments show that, compared with spatial filtering, frequency domain filtering, laplacian filtering and eliminate zero-order image method based on wavelet, the new method proposed in this paper can eliminate zero-order image better, whats more, the real image is also strengthened in some way.
Local Electric Field Enhancement of Neighboring Ag Nanoparticles in Surface Enhanced Raman Scattering
Authors: Deng Chao Yue , Zhang Gu Ling , Zou Bin , Shi Hong Long , Liang Yu Jie , Li Yong Chao , Fu Jin Xiang , Wang Wen Zhong
Published: September 2013

We used a simple low-temperature hydrothermal approach to synthesize Ag nanoparticles (NPs) and demonstrated their efficiency as organic molecule detectors in surface enhanced Raman Scattering (SERS). Using finite difference time domain simulation, we described an investigation on the distribution of electric fields amplitude of the neighboring Ag NPs. The enhanced electric field is confined at the interparticle gaps and the enhancement factor can be further increased with reducing the spacing between the NPs. The theoretical simulation demonstrated good consistency with the experimental measurement results, which predicts an electric fields amplitude enhancement of 115 at the center of NPs gap and an electromagnetic SERS enhancement of 108. The evidence of clear correlations between SERS enhancement and morphology distribution offer a route to develop more effective SERS substrates.
Photoluminescent Properties of Y2O3:Tb3+ Nanowires in AAO
Authors: Li Su Wen , Yue Ming
Published: September 2013

Uniform Y2O3:Tb3+ nanowires with diameters of about 70 nm were fabricated using the anodic aluminum oxide template (AAO). The Y2O3:Tb3+ nanowires and Y2O3:Tb3+/AAO composite were characterized by using powder X-ray diffraction (XRD), scanning electron microscope (SEM) and spectrofluorometer techniques. The Y2O3:Tb3+ nanowires are amorphous phase in symmetry as the annealing temperature was lower than 1000 °C. And the cubic Y2O3: Tb3+ nanowires were formed partly as the annealing temperature approached to 1000 °C. The spectral measurements indicate that the excitation and emission intensity increased with the increasing annealing temperature as well as annealing time. The lifetime of 5D4-7F5 transition becomes longer with the increasing annealing temperature and time in Y2O3:Tb3+/AAO composite.
Research on Wells Monitoring Background Management Software Based on Labview
Authors: Xu Ting , Lu Wen Bing , Zhang Miao Xin
Published: September 2013

Well monitoring system based on power line transmission information has low cost, can realize to span transformers through the area of long distance, as well as in remote areas does not exist blind area, the paper designs a kind of wells monitoring background management software based on the Labview. Due to the characteristics of well monitoring and power frequency communication technology, the labview reaches not only the data management, but also realizes to collect data for simulation and analysis of the channel. Wells monitoring background software based on labview not only realize data collection and management, but also realize the system equipment monitoring and debugging.
Improving the Stability of Tunable Diode Laser Sensor for Natural Gas Leakage Monitoring
Authors: You Kun , Zhang Yu Jun , Wang Li Ming , Li Hong Bin , He Ying
Published: September 2013

Tunable diode laser absorption spectroscopy (TDLAS) is a method of using a tunable diode laser scanning one of absorption lines of trace gas, this technique has advantage of high sensitivity, fast response, multi-component and non-contact measurement. We had already developed a TDLAS sensor for monitoring natural gas leakage during the natural gas production and the process of gathering and transportation in the natural gas station, but in the practical application we found that the TDLAS sensor was influenced by visibility changes. In order to overcome this interference and improve sensor stability, we present an automatic control circuit to process photoelectric signal for eliminating interference of visibility changes. Long-term monitoring results show that the concentration of CH4 are regular and stable during the natural gas production and transmission, therefore the application of the automatic gain circuit improved the stability of the TDLAS sensor.
Study of Fiber Grating Strain Sensing to On-Line Monitoring for Optical Cable of Electric Power System
Authors: zhang Ji Sheng , Wei Xu
Published: September 2013

Failure and security risks of communication optical cable in electric power system caused by anomalous changing of strain have been investigated, the current situation of the strain monitoring system for optical cable of electric power system has been introduced, and the principle and features of measuring the strain by using fiber grating sensing technology have been presented. The new method that can be used in strain monitoring for communication optical cable of key position in electric power system has been put forward, and fiber grating sensor scheme has been designed. Finally, several key technical problems in its practical application have been analyzed in detail.
Research on Rule Extraction Technology Based on Genetic Algorithm in Intrusion Detection
Authors: Guo Hui Ling
Published: September 2013

It is necessary to establish the rule base before intrusion detection. An adaptive method based on genetic algorithms was presented for learning the intrusion detection rules in order to realize the automation of attack rule generation. The genetic algorithm is employed to derive a set of classification rules from network audit data, and the support-confidence framework is utilized as fitness function to judge the quality of each rule. The generated rules are then used to detect or classify network intrusions in a real-time environment.
Research on Acoustic Monitoring for Boiler Tube Leakage Based on Information Fusion Theory
Authors: Tong Peng , Geng Chun Jing
Published: September 2013

The problem of how to detect and diagnose the tube leakage and blast through the methods of acoustics and information fusion is dealt with in this paper with the purpose of detecting the accident more accurately at its initial phase. Firstly, the acoustic monitoring method is employed since it is contactless, and then the weak leakage is detected, analyzed and diagnosed through such methods as the PCA, neural network and D-S evidence theory. Secondly, the simulation is conducted, which testifies that the diagnosis effect can be improved greatly by this way.
The Rotational Speed Measurement of Brushless DC Motor Based on STM32 Microcontroller
Authors: Bing Meng , Jia Fang Xiu , Yao Wen Jin
Published: September 2013

The brushless DC motor applied on the electric steering gear of trajectory correction projectiles often requires getting real-time rotational speed value. The hall sensors output the hall signals for measurement, after the integration by the D-type flip-flop, an ideal pulse can be produced. Afterwards STM32F103ZE microcontroller is used to calculate the rotational speed value of the motor by the Improved M/T method. The resolution and precision can be analyzed after getting the result. This rotational speed measurement system has high precision and good real-time characteristics. It is significant for the meaning of the correction of the steering gear.
A Non-Magnetic Temperature Controlling System Applied in Atomic Magnetometer
Authors: Huang Qiang , Xiang Kang , Huang Zong Jun , Sun Wei Min , Zhang Jun Hai
Published: September 2013

A non-magnetic temperature controlling system used in atomic magnetometer with flowing hot air has been designed and realized. To measure the temperature in the oven without any additional magnetic noise, a fiber Bragg grating was used as a non-magnetic temperature measuring sensor with a high relative accuracy. Analysis has showed the temperature fluctuation can be controlled less than 0.1°C.
Design and Implementation of University Archives Management System Based on .Net Technology
Authors: Cui Shu Min
Published: September 2013

ASP.NET and Web database are integrated to develop a B/S mode-based university archives management system so as to improve the efficiency and security of archives management system. Meanwhile, detailed analysis and study are made on related technologies such as systems demand analysis, overall design, database access method, and precautions for data security.
TD-SCDMA Smart Antenna Signal Intensity Measurement System
Authors: Liu Run Jie , Kou Dan Li
Published: September 2013

With the rapid development of China's TD-SCDMA system, how to qualitative and quantitative to judge intelligent antenna electromagnetic radiation pollution is a problem to be solved. Due to the special working principle of smart antenna, the second generation communication system spectrometer and field intensity meter measurement method is a complicated and difficult to operate. This paper introduces a design suitable for TD smart antenna measurement system: this system can realize in single user or multiple users at the same time and the TD base station set up calls link of multi-point synchronous signal intensity measurement. The measurement results of our system are very close to the measurement results of spectrometer field intensitys and can reasonable reflect TD stations around the extent of the electromagnetic radiation. This method of our system is easy, cheap and maneuverable