bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Three-Dimensional Modeling of Multi-Thread Single Screw Pump Rotor and Stator Based on UG
Authors: Sun Xing Wei , Wang Qiao Yun , Wang Ke , Wang Lei
Published: January 2010

Single screw pump is a kind of inside engaged biased rotation volume pump, which is widely applied in a number of major fields of the national economy. The key components are the rotor and the stator with complex spiral surface, which are meshing with each other. The machining accuracy of them makes effect on the working performance of single screw pump directly. In this paper, the operation principle of the single screw pump with large lead and multiple heads was represented, and the mathematical model of the rotor and the stator was established. The three-dimensional models of rotor and stator of single screw pump were put into effect with three-dimensional modeling software UG. This study has laid a theoretical foundation to the research of new manufacturing technology of the spiral curved surface and the development of the corresponding machine.
Study the Adsorption of Phenol on Attapulgite-Zeolite Nano-Structure Adsorbent from Aqueous Solution
Authors: Wang Zheng , Zhang Lin Sheng , Jing Zhao Qian
Published: January 2010

Attapulgite-zeolite composite nano-structure adsorbent was manufactured using natural attapulgite and zeolite. The obtained adsorbent was characterized by scanning electron microscope, energy dispersive X-ray spectrometer and mercury porosimeter. After elementary characterization of this adsorbent, batch tests were carried out to examine its removal mechanism of phenol. The influence of pH, contact time and initial phenol concentration were investigated. The pH variation studies showed that the optimum pH for adsorption of phenol was found to be 7. Adsorption equilibrium attained within 1 h time. The adsorption process followed pseudo-second-order kinetic model. Adsorption isotherm studies showed that Langmuir model fitted the experimental data better than Freundlich model. The attapulgite-zeolite composite nano-structure adsorbent in this study shows very good promise for practical applicability of phenol removal from aqueous solution.
Mesh Model Repair with Ck-1 Continuity
Authors: Yuan Tian Ran , Liao W.H. , Dai N. , Cheng X.S.
Published: January 2010

An efficient mesh model repair method is proposed in this paper, which can repair the holes with boundary continuity. It is mainly composed of the following steps: Firstly, the hole boundary is triangulated to generate the initial surface patch, of which the edges are distributed along the boundary averagely similar to an curtain covering at a window. Secondly, the initial surface patch is refined, and the interior edges are relaxed while refining to get a Delaunay-like refinement surface patch, which approximates the density of the surrounding mesh. Finally, the refinement surface patch is reshaped based on the minimization of the surface energy solved by the order discrete Euler-Lagrange equation in order to realize the continuity repair. The proposed method is proved to be efficient and robust by experiments of different kinds of boundary conditions.
Prohibition Effects on the Crack Propagation of Al2O3-ZrO2 Nano-Composite Ceramics under Ultrasonic Vibration
Authors: Ma Hui , Zhao Bo
Published: January 2010

This paper presents a research on the effects of ultrasonic frequencies of 19.9 kHz, 23.6 kHz and 29.3 kHz on both of cyclic amplitude and fatigue life of Al2O3-ZrO2 nano-composite ceramics. According to the high-cyclic-life tests at low load level, some prohibition influence on the process of crack initiation and propagation under ultrasonic vibration is revealed as frequencies are raised from 19.9 kHz to 29.3 kHz. During the low load level tests, the toughness increment induced by the transcrystalline fracture is found in the scanning electronic micrographs of the fractures, which shows the existence of the inhibition effect on the crack initiation and propagation. At the same time, the fracture XRD indicates that t-m phase transition of ZrO2 under 29.3 kHz is higher than that under 19.9 kHz, which means that both the required cyclic amplitude and the fatigue life can be improved if the ultrasonic frequency is increased to 23.6 kHz. All the test results show that high frequencies exhibit stronger toughening improvements than the lower ones do. This paper is a pre-research for the ultrasonic ceramic grinding and the conclusions obtained are meaningful for the study of the crack propagation mechanism during the grinding.
A Brief Evaluation of Jiangxi Hengfeng Eco-Industrial Parks Based on Green Manufacturing
Authors: Tang Yue Qin , Zhang M.L.
Published: January 2010

People in the world are more concerned about environment protection than ever before, which calls for green manufacturing (GM) and industrial ecology. With more eco-industrial parks (EIPs) built up recently in China, this GM, however, is progressively integrated into a ideal framework featuring in economies of scale as well as circular economy, aiming at saving energy, protecting the environment and sustaining economic growth. Jiangxi provincial government commits itself to constructing ten EIPs, one of which is Hengfeng EIP that succeeds both in business & investment invitation and circular economy. Likewise, some of the issues surrounding the environmental performance and resource management require a lot of exploration.
Adaptive Fuzzy Neural Network Control System in Cylindrical Grinding Process
Authors: Li X.M. , Ding Ning
Published: January 2010

An adaptive fuzzy neural network control system in cylindrical grinding process was proposed. In this system, the initial cylindrical grinding parameters were decided by the expert system based on fuzzy neural network. Multi-feed and setting overshoot optimization methods were also adopted during the grinding process, and a human machine cooperation system (composed of human and two fuzzy – neural networks) could revise the process parameters in real-time. The experiment of the cylindrical grinding was implemented. The results showed that this control system was valid, and could greatly improve the cylindrical grinding quality and machining efficiency.
Experimental Investigation of Turning with Magnetized Cutting Emulsion
Authors: Zhou Jun , Han Rong Di
Published: January 2010

The purpose of this study is to clarify the possibility of the turning process with the magnetized cutting emulsion. In particular, the effect of the magnetized cutting emulsion in turning process were examined through observation and measurement of the shape of the generated chips, machined surface integrity, cutting force and chip thickness compression ratio in a series of turning experiments. As a result, compared with dry turning and turning with cutting emulsion, the application of the magnetized cutting emulsion can decrease cutting force and chip thickness compression ratio, increases machined surface integrity.
Inverse Design of Cam Contour by NURBS Spline
Authors: Yuan A.F.
Published: January 2010

In this paper, according to the requirements of some cam component in rotary press, cubic NURBS spline is used to generate the contour of cam after calculating every control point on the basis of movement requirement of driven part. And software ADAMS is used to verify the calculation result. Results show this method is an effective way for manufacturers of rotary press to generate cam contour, which can improve the performance of cam mechanism and save much time.
Research on Remote Intelligent Fault Diagnosis of CNC Machine Tools and Realization of its Software
Authors: Li Y.C. , Fu Jian Zhong , Yao Xin Hua
Published: January 2010

Considering the development of cooperative design and internet-based manufacturing and in order to manage the manufacturing process more efficiently, a unit of remote intelligent fault-diagnosis based on Bayesian Networks was designed and a software based on internet was realized. The establishment of such system will enable efficient cooperation between CNC machine tools and users as well as maintainers.
Deformation Analysis of Thin-Walled Workpiece under Multi-Stress Coupled Effect
Authors: Lu Dong , Qin Guo Hua , Rong Yi Ming , Peng C.M.
Published: January 2010

This document Cutting stress coupled with clamping stress and initial stress affects the workpiece deformation. To analyze the workpiece deformation the initial stress model is developed. The finite element model of milling process is established and the milling force and milling heat is predicted. The multi-stress coupled model is developed and the workpiece deformation during machining process and deformation after fixtures released are predicted. This study is helpful to predict and control the deformation for thin-walled workpiece.
Development of Case Database of Fixtures Based on SolidWorks
Authors: Lin J. , Tan Guang Yu , Liu B.C. , Rong Yi Ming
Published: January 2010

This work employs Visual Basic and Access to develop a case database management system for flexible fixtures using coding technology and parameter driving technology. The database management system of fixtures’ cases is built. The secondary development of SolidWorks is performed by VB 6.0, and the system is transplanted to SolidWorks. The system can realize the fixtures’ auto coding, storage, search, display and system management with simple operation and convenient maintenance. The system has a large flexibility as the case database can be expanded and the fixtures’ parameters can be modified according to actual situation of enterprise without limitations of the software.
Boron-Doped Nanocrystalline Diamond Films Deposited By Using DC Arc Plasma Jet CVD
Authors: Xiang Bing Kun , Zuo Dun Wen , Li Xiang Feng , Xu Feng , Wang M.
Published: January 2010

Boron-doped micro-nanocrystalline diamond coating may be successfully prepared on Mo substrate with DC arc plasmas jet deposition device. Along with the increase of doped-boron concentration in the film, two-point resistance measurement indicates that film resistance presents exponential decrease; Raman spectrum test shows that, the characteristic peak value of diamond 1332cm-1 in the spectrum moves toward low frequency, the semi-height width of diamond peak, peak D and peak G, etc. in the spectrum is expanded, and the component of non-diamond bonds such as sp2, etc. in the film is increased; SEM and AFM observation shows that, increasing the doped-boron concentration could further subdivide the crystal grains in the film, and is beneficial for the growth of nano- or ultra-nano-crystalline diamond film; film annealing test shows that, micro-nanocrystalline diamond film with higher doped-boron concentration has better thermal stability than the micro-nanocrystalline diamond film without doped boron.
Study on the Kinematics of the Lips of the Twist Drill on the Axial Vibration Part 2: Theoretical Chip Length and Dynamic Angles of the Drill
Authors: Gu Li Zhi , Hong Qi , Xiang Chun Jiang
Published: January 2010

In vibratory drilling, the chip lengths and working angles alter respectively, and play important part in the process for the quality, efficiency, and chip breakage. The length of the edge movement in real drilling is just the theoretical length of the chip as the distance between the adjacent entering point and detaching point. It is revealed that from the condition of hm=0, the chip breaks automatically in the disjunction vibratory drilling pattern. Change of the dynamic angles was researched and based on the finding that the dynamic angle change undulates cyclically versus vibratory phase angle as well as the axial velocity in magnitude and direction of the drill, generated from the input of vibratory signals, the best performance of the drill in work may be pursued with the optimal working angle and clearance angle obtained by selecting the input vibratory parameters and selecting other drilling parameters in proper order.
The Existence and Uniquence of the Solution for the Newtonian Equation
Authors: Feng Yan Qing , Shen Z.H.
Published: January 2010

In this paper，the methods of the basin of attraction and the nonnegative coercive function are used to discuss the existence and uniquence of the periodic solution to the Newtonian equation of motion. Some Theorem is proved and the main results are generalized and discussed in this papers．
Studying on the Fiber Diameter of Polypropylene (PP) Spunbonding Fabric by Means of Artificial Neural Network Model and Physical Model
Authors: Zhao Bo
Published: January 2010

In this work, the artificial neural network model and physical model are established and utilized for predicting the fiber diameter of polypropylene(PP) spunbonding nonwovens from the process parameters. The artificial neural network model has good approximation capability and fast convergence rate, is used in this research. The results show the artificial neural network model can provide quantitative predictions of fiber diameter and yield more accurate and stable predictions than the physical model, which reveals that the artificial neural network model is based on the inherent principles, and it can yield reasonably good prediction results and provide insight into the relationship between process parameters and fiber diameter.
A Research on E-Business Applied to the Innovativeness of the Tourism Enterprises’ Management
Authors: Wei M.
Published: January 2010

The internet with its growing population has technologies which provide the tourism enterprises’ management with an unprecedented level of connectivity and the ability to communicate efficiently and effectively directly with tourism customers. E-business which operates on the backbone of the Internet could help the tourism enterprises generate innovativeness conducting to additional revenue by reaching the markets they could not access using traditional systems. The innovativeness plays a very important role in the tourism enterprises’ management in recent years, by which the application of e-business can supply with more convenience. The article analyses the factors which lead tourism consumers to becoming online consumers. Particularly, e-business is viewed as means of the innovativeness affecting the tourism enterprises’ management, so the e-business application is proposed to add innovativeness to the tourism enterprises’ management recently. The model of the innovativeness of the tourism enterprises’ management is tried to be tested on tourism e-business consumers who do online shopping for tourism product or service. Finally, it can be believed that e-business acceptance of tourism enterprises is determined by the tourism e-business consumers’ attitudes to the model of innovativeness of the tourism enterprises’ management.
Analysis of the Type of China’s Cooperative Education Model
Authors: Liu C.M. , Hu W.M.
Published: January 2010

This article utilizes the synthetic study method to carry on the discussion about China’s cooperative education model that has tried out in the university. In 1985, the Textile Institute of Shanghai Engineering Technology University studied the experiences of Waterloo University, they experimented one year three semesters cooperative education model jointly with 6 factories. Since then, China's colleges and universities began to experiment the cooperative education model and showed different types of it. This paper classifies and sums up the types of cooperative education model that divided by the organizational form, the production and study time and the way of cooperation in age 80-90 for the 20th century in China. The models were divided into 14 kinds of test patterns, and these models are briefly outlined.
Study on the Bond and Anti-Abrasion Performance of Repair Materials for Hydraulic Concrete
Authors: Jiang Chao Hua , McCarthy T.J. , Chen D. , Dong Q.Q.
Published: January 2010

The bond and anti-abrasion performance of repair materials are the key factors for successful repair of hydraulic concrete. Acrylic acid emulsion (AAE) mortar, silica fume (SF) mortar, high strength (HS) mortar, polypropylene (PP) fiber mortar and basalt fiber (BF) mortar were prepared and their direct tensile bond strength, splitting tensile bond strength, abrasion resistance and SEM analysis of bond interface are studied in this paper. The results show that the highest direct tensile bond strength was recorded for fiber mortar. But compared to homogenous specimen’s tensile strength, AAE mortar showed the highest direct tensile bond strength. The anti-abrasion properties of repair mortars were tested with decreasing performance recorded in the following order: PP fiber mortar, SF mortar, BF mortar, HS mortar and AAE mortar. Compared with the HS mortar without fiber, the wear rate of PP fiber mortar was decreased by 29.2 % and the anti-abrasion strength was increased by 37.7%. This shows that adding fiber can greatly improve the anti-abrasion property. SEM analysis showed that addition of PP fiber and BF into repair mortar did not change the type of hydrates. The interface of AAE mortar was level and dense. The bond interface of SF mortar was uniform without big porosity. Addition of super plasticizer, the bond interface of HS mortar presented a large quantity of fibrous the CSH gel and less porosity which could improve the mortar bond effect effectively.
On Diversified Development of Scholarship in Local Colleges and Universities
Authors: Liu W.J. , Pan J.L.
Published: January 2010

In view of the problem of convergence of positioning and inaccuracy of social functioning for a large number of local colleges and universities in our country, this paper draws lessons from Ernest Boyer’s new paradigm of scholarship and its enlightenment on the diversified development of scholarship in America’s local colleges and universities, re-examines the mission of local colleges and universities for the local services in our country, and puts forward suggestions on diversified development of scholarship for local colleges and universities.
Study on the Distribution of Residual Stresses for Nondestructive Marking by Laser Shock Wave
Authors: Lu Jin Zhon , Luo Kai Yu , Yuan P.P. , Yin Su Min , Zhang Yong Kang
Published: January 2010

The marking system by laser shock wave (LSW) based on liquid crystal mask, which differs entirely from marking by laser ablation (or laser thermal effect), was established. Two-dimension (2D) nondestructive markings based on liquid crystal mask were prepared by LSW, and the distribution of residual stresses in laser-shocked region was measured and analyzed. The results showed that tensile residual stresses of sample surface were converted into compressive residual stresses by LSW, which is a nondestructive marking for aviation key parts.
An Empirical Analysis on Regional Manufacturing Integration of the Yangtze River Delta Area
Authors: Li Tan
Published: January 2010

Based on the industrial advantages and the development of modern manufacturing industry, industrial isomorphism and manufacturing capacities which affect the manufacturing integration of the Yangtze River Delta Area has been analyzed. The major findings are that there exists structural isomorphism only in macro-industry areas, but their micro structures are different. There are distinct leading manufacturing industries respectively in Suzhou, Wuxi and Changzhou. Finally, a conclusion can be drawn that we should adopt dislocation strategy to promote the three cities’ manufacturing integration, and shape a model of Suzhou-electronic information, Wuxi-microelectronic industry and Changzhou-equipment manufacturing industry.
Improvement of Deposition Uniformity in Laminated Templates Electro-Deposition
Authors: Fan Hui
Published: January 2010

Laminated templates electro-deposition (LTE) is a small-sized metallic-structure fabrication technique based on template-patterned depositing. Avoiding locally excessive electroplating at the template edge area has been proved crucial to this method. To improve deposition uniformity, auxiliary cathode and modulated double-pulse current were tried individually and assessed on their effects and efficiencies. By applying assisting cathode the deposition uniformity in plannar pattern depositing was significantly improved with an increased thickness ratio of edge to center for the plating sample. Pulse application, especially double-pulse was studied mainly on the proportion between anodic duty circle and cathodic duty circle. Through a group of optimized parameters, including current density ranging 8-10A/dm2, anodic and cathodic duty circle of respectively 80% and 30%, frequency 300HZ, a bulk of copper parts, section size 20×20mm and 4-7mm thick were produced with a well depositing quality.
Effect of Optimization of Shot Peening Parameters on Surface Integrity of NAK80
Authors: Miao Hong , Zuo Dun Wen , Wang Hong Feng , Sha X.W.
Published: January 2010

Shot peening is known to improve the fatigue performance of materials. The improvement in fatigue is that plastic deformation in the surface increases hardness, yield stress and microstrain of thinning Crystal block and dislocation density, and formed advantaged compress residual stress that are introduced into the near-surface of the components and which hinder crack initiation and growth. But over peening effect is produced when shot peening strengthening goes beyond a certain limit, which was adverse to improve surface quality. This paper adopted the optimization of the critical peening parameters to avoid appearing over peening effect. The experimental result showed that arc high value of optimal shot peening was 0.40mm.
A Study on the Sensors and Actuators Test-Bed of Electronic-Control Engine
Authors: Dai J.G. , Liao L.Y.
Published: January 2010

The design mentality and the unique feature of sensors and the actuators of AJR electronic-control engine test-bed were introduced. The test-bed not only examines each sensor’s static parameter directly, but also used tester and oscillograph to examine the data stream, the waveform, and so on. Besides the functions of the test-bed that mention formerly, the sensors and the actuators malfunction diagnosis module was designed. The test-bed was debugged when it was completed, and the results show that the test-bed achieved the desired goal, as well as meet the requirements of the actual teaching.
Fast Implementation of Image Processing Algorithm Based on DSP
Authors: Zhou Yue
Published: January 2010

In this article, the image processing algorithm can quickly become a DSP execution program and run immediately by using Model-Based Design method. As an example, it shows how to design and implement a vehicle detecting and tracking algorithm on TDS642EVM. The experiment proves that this method realizes the integration from design to implementing, and shortens the developing period of image processing algorithm greatly.
Analysis on Formation Causes for Defects of Powder Metallurgy Flyweights
Authors: Shen X.P. , Wang X.Y. , Liu D.M. , Chen M. , You C.T. , Yan Y.B.
Published: January 2010

The flyweight of powder metallurgy is a complex structure part of VE distribution pump. The components of the powder forming process often contain the defects such as instability of the quality, over tolerance of the size accuracy, and disqualification of the appearance. By analyzing the causes of defects and corresponding measures is taken. A once pressing compaction method is used to produce qualified products.
Modeling of Spiral Surfaces with Variable Pitch and Variable Diameter and CAPP of the Screw Head
Authors: Song J.L.
Published: January 2010

Based on the analysis of feature parameters for the screw, presented the uniformed mode of the spiral surface with variable pitch and variable diameter, discussed in detail the formation of it with four-axis linkages of the machine. The major parts of the processing system was designed. CAPP of the spiral surface in special milling operation was put forward and successfully realized in the workshop, taking the operation of a screw head as an example, for premium quality.
Experimental Study on Numerical Controlled Electrochemical Turning
Authors: Kang Min , Fu X.Q. , Yang Yong
Published: January 2010

In order to machine revolving workpieces which are made of difficult-to-cut materials or have low rigidity, the technology of Numerical Controlled Electrochemical Turning (NC-ECT) was put forward and the preliminary experimental study was presented in this paper. To carry out the study, an experimental setup was developed, and a new special kind of inner-spraying cathode with single linear edge was designed according to the process of machining cylindrical surface and the requirement of stable electrolyte flow field. First, the NC-ECT method was simply described. Then, considering the structure of the cathode and the machining process, the method for calculating the material removed depth per revolution in machining the cylindrical surface was given. Finally, the experiments of machining the cylindrical surface were carried out. Experiments showed: 1) The calculated material removed depth per revolution is well consistent with the actual value of the machining process, which decreases with the increase of the rotational speed of the workpiece and increases almost linearly with the increase of the working voltage; 2) The surface roughness decreases with the increase of the rotational speed of the workpiece and the working voltage; 3) The working current in the machining process trend to stable after several revolutions.
Numerical Simulation of Hydrodynamic Fluid Pressure in Grinding Zone with Resin-Bonded Diamond Grinding Wheel
Authors: Hou Ya Li , Li Chang He
Published: January 2010

In the grinding process, grinding fluid is delivered for the purposes of chip flushing, cooling, lubrication and chemical protection of work surface. Lubrication and cooling are the most important roles provided by a grinding fluid. Hence, the conventional method of flood delivering coolant fluid by a nozzle in order to achieve high process performance purposivelly. However, hydrodynamic fluid pressure can be generated ahead of the grinding zone due to the wedge effect between wheel peripheral surface and part surface. In the paper, a theoretical hydrodynamic pressure modeling is presented for flow of coolant fluid through the grinding zone in flood delivery mode in the surface grinding using resin-bonded diamond grinding wheel, which based on Navier-Stokes equation and continuous formulae. The numerical simulation results showed that the hydrodynamic pressure was proportion to grinding wheel velocity, and inverse proportion to the minimum gap between wheel and workpiece and the maximum pressure was generated just in the minimum clearance region in which higher fluid pressure gradient occur. It can also be concluded the pressure distribution was uniform in the direction of width of wheel except at the edge of wheel because of the side-leakage.
Study on Numerical Simulation and Pressure Control for Vacuum Casting Quality
Authors: Liu Yuan Yuan , Liu Da Li , Wang J.W. , Huang J. , Chi Z.F. , Hu Qing Xi
Published: January 2010

Differential pressure Vacuum Casting is a new kind of rapid manufacturing technology. The filling speed is the key process parameter which decides the filling quality. In order to ensure the stabilization of the flowing speed, qualitative model has been set up. Both CAE software and BP Neural Network Models have been used to find the relation between the inlet pressure and the forward speed. Using the inverse BP Model and giving a constant velocity of every section in the cavity, the expected pressure values have been got. In terms of the Filling Length Measure Method (FLMM) proposed by the researchers, the time points of flowing stage have been evaluated. The relation between the expected values of inlet pressure and time points has been concluded from this study.
Study on Mathematical Model of Temperature Field in the Laser Welding Process
Authors: Wang Hong Feng , Zuo Dun Wen , Huang Ming Min , Miao Hong
Published: January 2010

From the laser welding actual process, the welding heat source model of laser welding process was established, that is, superposition heat source. According to the knowledge of thermodynamics, the establishment of a welding process, the mathematical model of temperature distribution of laser welding process was obtained by laser welding heat source. Finally, the finite element simulation of welding temperature distribution was used. The simulated results were compared with the analytical results of mathematical model of temperature field, it was proved consistent between simulated results and analytical results, at the same time it can account for the correctness of the mathematical model of temperature field.
Synthesis of Disk-Rod-Disk Liquid Crystal Trimers by Using Click Chemistry
Authors: Yu Wen Hao , Bai Yue Feng , Jing Yang , Nie Shi Chang , Wang Bi Qin , Hu Ping , Zhao Ke Qing
Published: January 2010

A series of disk-rod-disk liquid crystal trimers have been synthesized. Two triphenylene discogens have been connected to a biphenyl mesogen via CuI-NEt3 catalyzed alkyne azide cycloaddition in toluene at room temperature. The trimers have been characterized by using 1H NMR, IR, high resolution Mass spectra and the mesomorphic properties investigated with polarized optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray diffraction. The result shows that the trimers exhibited rectangular columnar mesophase (Colr). The length of the flexible spacer connecting the three segments has important influence on the thermal behaviors of the trimers.
Synthesis of Novel Discotic Hexa-Peri-Hexabenzocoronene Derivatives and the Influence of Substituents on Properties
Authors: Liu Xu Ying , Wang Wen Guang , Pu Jia Ling
Published: January 2010

Due to hexa-peri-hexabenzocoronene (HBC)’s perfect structural and their promising electronic and optoelectronic properties, the novel derivatives of HBC have continuously attracted interest. Hexaphenylbenene, as a necessary precursor to synthesize HBC, is affected by the substituents during dehydrocyclization. New synthetic strategy of some HPC derivatives with long-chain ester groups is described. Their structures were established by 1H nuclear magnetic resonance (1HNMR) and infrared spectrometry (IR), ultraviolet-visible spectrograph (UV-vis). The results indicate that the substituents play an important role on oxydehydrogenation of HPCs.
Synthesis and Mesomorphism of Semi-Fluorinated Chain Liquid Crystals with [1,2,3]-Triazole Rings
Authors: Yang Yang , Zhao Ke Qing , Yu Wen Hao , Wang Bi Qin , Hu Ping
Published: January 2010

Series of semi-fluorinated chain liquid crystals with [1,2,3]-triazole rings have been synthesized with CuI-Et3N catalyzed alkyne-azide cycloaddition reaction. The selectively produced 1,4-disubstituted regioisomers were characterized by using IR, NMR, and Mass. The mesomorphic behaviors were characterized with polarizing optical microscopy and differential scanning calorimetry. Compounds with perfluorinated chains have showed smectic A phase.
A2BA2-Type Amphiphilic Liquid Crystalline Block Copolymers by ATRP: Synthesis and Characterization
Authors: Tang Xin De , Han Nian Feng , Xu Jing
Published: January 2010

A2BA2-type amphiphilic liquid crystalline block copolymers containing azobenzene were synthesized by atom transfer radical polymerization (ATRP). The macroinitiator prepared by the esterification reaction between poly(ethylene glycol) (PEG) and 2,2-dichloroacetyl chloride was used to initiate the ATRP of 6-[4-(4-ethoxyphenylazo)phenoxy]hexyl methacrylate (M6C). The resulting macroinitiator and block copolymers were characterized by 1H NMR, gel permeation chromatography (GPC). Polarizing optical microscopy (POM) and differential scanning calorimetry (DSC) preliminarily revealed the liquid crystalline property of these block copolymers. These novel amphiphilic liquid crystalline block copolymers are promising in some areas, such as optical data storage, optical switch, and molecular devices.
Synthesis and Mesomorphism of 1,1’-Disubstitued Ferrocene Liquid Crystals with a Schiff’s Base Bridge
Authors: Yan Qing , Hu Ping , Yu Wen Hao , Wang Bi Qin , Zhao Ke Qing
Published: January 2010

To investigate the influence of alkyl chain on thermotropic and mesomorphic properties of 1,1’-disubstitued ferrocene derivatives, two series of ferrocene derivatives containing Schiff's base, 1,1’-C8H17FcC6H4COOC6H4CH=NC6H4OOCC6H4R1 (R1 = H, OCnH2n+1, n = 2, 4, 6, 8 ) and 1,1’-C8H17FcC6H4COOC6H4CH=NC6H4N=NC6H4R2 (R2 = Br, Cl, CH3 ) have been synthesized and characterized by IR and 1H NMR. Polarized optical microscopy (POM) and differential scanning calorimetry (DSC) results showed that all compounds exhibit nematic mesophase. The results show that the flexible alkyl chain connecting with ferrocene moiety could lower the melting points and clearing points, favor the formation of nematic mesophase.
Textural Spectral Characteristics of the Cholesteric Liquid Crystal
Authors: Wang Jia Ling , Du Xin , Lv Jia , Yu Tian Chi , Fan Zhi Xin
Published: January 2010

For the cholesteric liquid crystal (hereinafter short for Ch-LC) possesses special optical properties, it has specific applications in the area of liquid crystal displays and optoelectronic devices. Specimens of Ch-LCs in planar and focal conic texture stably are prepared. The photographs of textures are shot by polarizing microscope and transmittance spectrums of different textures are measured by spectrophotometer. It is found that the specimen in focal conic texture with large crystal domains has the well transmission property. The experiment has an important significance for applications of liquid crystals.
Diffraction Equation for One-Dimensional Gratings Self-Assembled by Banana-Shaped Liquid Crystals
Authors: Zhai Bao Gai , Huang Yuan Ming
Published: January 2010

Banana-shaped liquid crystals can self-assemble themselves into one kind of thin films in which periodic modulation of the refractive index can be developed. When a beam of light is shone onto the thin films, diffraction patterns can be formed. In this work, the diffraction equation is derived for one-dimensional diffraction gratings formed by banana-shaped liquid crystals.
Groove-Free Optical Gratings Self-Assembled by Banana-Shaped Molecules
Authors: Huang Yuan Ming , Ma Qing Lan , Zhai Bao Gai
Published: January 2010

. We demonstrate that banana-shaped molecules 1,3-phenylene bis(4-methoxybenzylidene amine) can assemble themselves into diffraction gratings when the melt of the banana-shaped compound, which was sandwiched between two pieces of glass substrates, is cooled to room temperature. Polarizing optical microscopic characterization shows that a pattern of periodic modulation of the refractive index can be developed in the thin films formed by the banana-shaped compound. Despite the gratings are groove free, their optical properties are the same as classically ruled gratings. Our work provides an alternative method for manufacturing diffraction gratings by harnessing the self-assembly of banana-shaped molecules.
Photo-Stimulated Phase Transitions
Authors: Prasad S. Krishna
Published: January 2010

Employing actinic light to alter/stabilize a particular thermodynamic phase via the photo-isomerization of the constituent molecules is an interesting tool to investigate soft matter from a new dimension. This article focuses on the influence of different parameters, such as pressure, confinement, applied electric field, etc., on the dynamics associated with both the photochemical transition driving the equilibrium nematic to the non-equilibrium isotropic phase and the thermal back relaxation recovering the nematic phase.
Overview on Roles of Wettability and Elasticity of Soft Matters for Emerging Technologies
Authors: Lee Sang Wook , Na Yu Jin , Choi Won Suk , Lee Sin Doo
Published: January 2010

The fundamental aspects of the wettability and the elasticity of soft matters, particularly, functional polymer solutions, lipid membranes, and biological cells in the development of new technologies are overviewed from the basic principles and underlying physics. The key concept is how to control interfacial interactions between solid substrates and soft matters through surface modification. Two representative examples are demonstrated to discuss the underlying physics behind the pattern and domain formation; one of them is multi-dimensional generation of heterogeneous organic arrays and the other is micro-patterning of red blood cells on lipid membranes
Photo-Instability in a Binary Mixture of Banana-Shaped and Rod-Shaped Liquid Crystals
Authors: Chen Lan Li , Zhai Bao Gai , Huang Yuan Ming
Published: January 2010

By triangular wave method, we studied the effects of ultraviolet irradiation on the polarization of a binary liquid crystal mixture. The mixture was comprised of 94 wt% of banana-shaped liquid crystal 4-chloro-1,3-phenylene bis [4-(4-n-tetradecyl) phenylimino methyl] benzoate and 6 wt% of an azo-containing rod-shaped liquid crystal hexanoic acid 4-(4-ethoxy-phenylazo)-phenyl ester. Under the 365 nm irradiation for 40 minutes, the polarization of the mixture was observed to decrease 10% although the component of the banana-shaped liquid crystal was photostable. Our results demonstrated that photolysis took place in the component of azo-containing rod-shaped liquid crystal.
Anisotropic Reflectivity of Rubbed Polyimide Liquid Crystal Alignment Layer
Authors: Zheng Wen Jun
Published: January 2010

The surface optical anisotropy of rubbed polyimide films has been detected using reflection anisotropy spectroscopy. The amplitude of the reflection anisotropy signals increases with the rubbing strength. Rubbing also causes changes in pretilt angle of liquid crystal molecules which are in contact with the rubbed polyimide. An increase in rubbing strength results in an increase in the pretilt angel. The pretilt of the liquid crystal molecules was found to linearly correlate with the amplitude of the RA signals.
Investigation on Properties of Dye Ink Prototype e-Paper
Authors: Li Lu Hai , Fang Yi , Qiao Shu Nan
Published: January 2010

The pigment electrophoresis dispersion has been the widely used system. It is, however, worth of attention if molecular dye, instead of pigment, can be used in the display of electronic paper. By carefully selecting the structure of dyes, especially the metal complex dyes, and studying the properties of the prototype display. It was found there are about 15 dyes electrophoresis and some dyes display well. The dyes ink with good stability during electrophoresis when the electrode was protected, while the response time is about 300 ms, and the concentration is an important factor on the display optic density. The displaying principle of dye ink was studied too.
Investigation on Two-Dimensional Photonic Crystal Self-Collimation Splitting Sensor
Authors: Wang Yu Fei , Lai Guo Zhong , Zhang Jian Feng , Lin Fu Zhong , Liang Xiong , Chen Xi Yao , Qiu Hui Ye , Su Yu Xia
Published: January 2010

A self-collimation splitting sensor truncated in a two-dimensional (2D) photonic crystal has been proposed and demonstrated theoretically. Intensity of transmitted light and reflected light, which varies with the width of the splitter, is detected at two output ports. Calculation results validated by the 2D finite-difference time-domain technique show that with the increase of width, the transmittivity decreases while the reflectivity increases and their summation decreases. Considering the trade-off between the sensitivity of the optical detector and the loss of power, including the difficulty of fabrication, the width of 0.4a is meet for the sensor. The simulated relative intensity monotonously increases from 1.63 to 2.94 nonlinearly.
Features of Printing and Display
Authors: Li Lu Hai , Fang Yi , Xin Zhi Qing , Tang Xiao Jun , Du Peng , Zhao Wen
Published: January 2010

The manufacture of display device is a complex technology. To reach the flexible display like E-paper, many manufacture process such as driving electrode circuit and transistor must be combined with printing technology. From the information reported, the application of gravure prints technology in organic electronics; off-set printing in EMI film and screen technology in circuit are summarized. The study was more about ink jet print technology. It was described that ink jet was used in OLED (Organic light-emitting diode), OTFT (organic thin film transistor), polymer solar cell/ Flexible organic photovoltaic cell and so on. An OE-A (organic electronics application) roadmap for the charge carrier mobility of semiconductors for organic electronics applications was given. To achieve the printed circuit, the nano silver conductive ink was applied and the ink jet circuit surface was tested by microscopy, the conductive and flexible silver film was with many advantages than screen circuit. It was concluded that the printing electronic will play important roll in the display development.
Quanta Energy Level Structure and the First-Order Freedericksz Transition of Weak Anchoring NLC Cells
Authors: Guan Rong Hua
Published: January 2010

The energy problem of weak anchoring nematic liquid crystal (NLC) cell is investigated. For given system, there are four solutions satisfying mechanical equilibrium conditions simultaneity under certain condition. Liquid crystal system exist quanta energy level. The values and sequence of energy levels related to the change of external field and anchoring parameters. The state with the smallest energy is the stable state and the others are metastable states, which are separated by the energy barriers. The Freedericksz transition can be considered as the director slippage through these barriers to the lowest energy level and the first order transition and bistable state result from the existence of the multiple disturbed solutions.
Fabrication of Simple Diode Structure FED Device with Connecting Plate
Authors: Li Yu Kui , Li Cong
Published: January 2010

By using the thick soda-lime glass plate and the flat thin glass, the connecting plates were formed easily. The carbon nanotube materials were prepared to form the field emitters. The simple small diode structure field emission display device with connecting plate was developed. The detailed fabrication technology for the whole device was also presented. The sealing of the vacuum room was performed by means of glass frit and the gas in the vacuum room could be evacuated out through the exhaust tube. The developed diode structure FED sample exhibited large field emission current, better field emission properties and image display performance.
Optical Properties and Electronic Structures of Sexithiophene
Authors: Zhai Bao Gai , Huang Yuan Ming
Published: January 2010

The optical properties and electronic structures of an organic semiconductor sexithiophene have been investigated with ultraviolet-visible spectroscopy, cw photospectroscopy and time-resolved photospectroscopy, respectively. Sexithiophene in dilute tetrahydrofuran solutions can absorb photons at 400 nm while it can give off strong green photoluminescence at 550 nm under the excitation of 325 nm ultraviolet light. With the assistance of calculated electronic structures and pump-and-probe characterization, our results indicate that both the optical absorption and the light emission of the sexithiophene are controlled by the p-conjugation of the oligothiophene.
Effect of Cis-Backbone on Optical Properties of Polyphenylacetylene
Authors: Zhai Bao Gai , Huang Yuan Ming
Published: January 2010

By controlling the temperature of chemical reaction, we synthesized four polyphenylacetylene samples, in which the percentages of cis configurations were determined to be 65, 75, 85 and 100%, respectively. Ultraviolet-visible and fluorescence studies show that the cis-configured backbones have posed significant effects on the optical absorption and fluorescence of the polyphenylacetylenes. Upon the 325-nm excitation, the dilute solutions of these cis-polyphenylacetylenes give off weak fluorescence with their peak located at about 390 nm, but the concentrated solutions of the polymer can give off strong orange-red fluorescence with their peak located at about 600 nm. With Hückel tight binding theory, both the E-k dispersion relations and the density of states were calculated for cis-polyphenylacetylene. Our results suggest that the blue photoluminescence of polyacetylenes origins from the backbone enhanced -conjugation of the phenyl chromophors in the polymer, and that intermolecular interactions can occur in the excited complex of the polymer.
Study on Phase Matching in Parametric Six-Wave Mixing in Rb
Authors: Zhu Chang Jun , Liu Han Chen , Zhai Xue Jun , Xue Bing , Zhang Chong Hui
Published: January 2010

Parametric six-wave mixing processes have been achieved in Rb and two parametric six-wave mixing channels, 5S→→5D→→6P→→S1/2→→P1/2→→5S and 5S→→5D →→P→→S1/2→→52P3/2→→5S, have been identified. Competition between the two channels is observed and, furthermore, phase matching conditions in the two channels are analyzed and calculated. The calculation results agree well with the experimental observations, indicating that the phase matching is the main factor governing the competition between the two parametric six-wave mixing channels.
Study on Preparation of Ultrafine NiFe2O4 Particles by Microemulsion Method
Authors: Zhang Ling Yun , Li Han Sheng , Guan Han Min , Zhu De Chun
Published: January 2010

Ultrafine NiFe2O4 particles with spinel structure were prepared in the system of water-in-oil microemulsion of water/Triton X–100/n-hexanol/cyclohexane. The effects of calcining temperature and the other operation conditions were systematically discussed based on the techniques of SEM, XRD, VSM and so on. The result showed that NiFe2O4 nanoparticles, with a narrow size distribution(30-70nm), could be obtained by microemulsion method. The crystal grain diameter of the ultrafine NiFe2O4 particles could be enhanced with the improvement of the calcining temperature, the molar ratio of water to surfactant (w=[H2O]/ [surfactant]) and the concentration of Fe3+(or Ni2+), respectively. The VSM plots showed that the ferrimagnetic behavior was expected for this type of magnetic material. The XRD patterns and DTA-TG curves revealed that the optimal calcining temperature of NiFe2O4 sample was at around 500°C. The relation between the average particle size (D) and the value of w could be expressed as D=13.911+0.2628w. Moreover, it was indicated that low concentration of Fe3+(or Ni2+) was beneficial to the formation of small and regular NiFe2O4 particles.
Synthesis and Magnetic Properties of Water-Based Fe3O4 Ferrofluid
Authors: Qu Xiu Rong , Lü Shu Chen , Fu Shu Fang , Meng Qing Yu
Published: January 2010

Stable water-based Fe3O4 ferrofluid was obtained by three steps. Fe3O4 nanoparticles with the size of about 10 nm were first prepared by chemical co-deposition method. In order to prevent Fe3O4 nanoparticles from agglomerating, they were coated by bilayer surfactants. Then, the coated Fe3O4 nanoparticles were dispersed well into water. Due to the actions of electrostatic force and hydrogen bond, the water-based Fe3O4 ferrofluids can keep stable for two years and no layered phenomenon occurred. The ferrofluid has high saturation magnetization, low remnant magnetization and coercive force.
Design of Signal Conditioning Module of PT100 Temperature Sensor Detection System
Authors: Wang Xiao Jun , Yin Xi
Published: January 2010

The measuring circuit of signal conditioning module of platinum resistance temperature sensor detection system uses a sub-three-wire connection mode. It can improve the measurement accuracy and reduce the measurement error caused by the external circuit. The amplifier circuit is an operation circuit using in phase input. The system can achieve multi-channel measurement of sensor by using multiplexer with the measurement accuracy of 0.1oC.