bluuebunny/crossref_metadata_2025 huggingface dataset:
Nano Composite PVA-TiO2 Thin Films for OTFTs
Authors: Sathish S. , Chandar Shekar Bellan , Bhavyasree B.T.
Published: April 2013

Pure PVA and composite thin films of poly vinyl alcohol (PVA)/Titanium dioxide (TiO2) were prepared on pre-cleaned glass substrates by Dip Coating Technique (DCT) and Metal Organic Deposition Technique (MODT). EDS and FTIR spectrum were used to identify the composition of the prepared films. The vibrational peaks observed at 1260 cm-1 and 851 cm-1 are assigned to C–C stretching and CH rocking of PVA. The characteristic band appearing at 1432 cm-1 is assigned to C–H bend of CH2 of PVA. The bands observed around 847 cm-1 and 601cm-1 belong to the asymmetric stretching of Ti–O–Ti groups. The last band at 460 cm-1 is due to the bending mode of Ti–O–Ti. The bands covered by Ti-O were located at 540, 700 and 950 cm-1. From the FTIR spectra, it is observed that some of the peaks of composite films were shifted and some of them were disappeared with respect to the pure compounds. This results manifested the conclusion about the specific interactions in composite polymer matrices and hence the complexation. Thus, complex formation in the composite polymer matrices has been confirmed from this analysis. The thickness of the coated films were measured by using an electronic thickness measuring instrument (Tesatronic-TTD-20), gravimetric method and cross checked by optical spectrophotometer. XRD spectra indicated the amorphous nature of the films. Surface morphology of the coated films was studied by scanning electron microscope (SEM). The surface revealed no pits and pin holes on the surface. Both as grown and annealed films showed predominantly amorphous nature. The observed surface morphology and thermal stability indicated that these films could be used as dielectric layer in organic thin film transistors.
Photoelectrochemical Behaviour of Copper Indium Selenide Thin Films
Authors: Chitra Venkatapathy , Ananthi Kalimuthu , Vasantha S.
Published: April 2013

Copper Indium Selenide (CIS) thin films were pulse electrodeposited at room temperature and at different duty cycles in the range of 6 – 50 %. Deposition current density was kept constant at 5 ma cm-2 in the present work. The total deposition time was 60 min. The precursors used were AR grade 0.3 M of each CuCl2 and InCl3, along with 0.2 M of SeO2. Thickness of the films estimated by Mitutoyo surface profilometer varied in the range of 0.8 to 1.2 μm with increase of duty cycle. XRD patterns of CIS films deposited at different duty cycles exhibit the chalcopyrite structure. Composition of the films indicated Cu/In ratio is greater than 1. Optical absorption studies indicated a direct energy band gap of 0.95 eV. Surface morphology of the films indicated that the grain size increased from 15 nm to 40 nm as the duty cycle increased. It is observed that as the duty cycle increases, the resistvity increases from 1.0 ohm cm to 10 ohm cm. The films were used as photoelectrodes in 0.5 M polysulphide redox electrolyte (0.5 M each Na2S, NaOH, S). At 60 mW cm-2, an open circuit voltage of 0.465 V and short circuit current density of 3.87 mA cm-2 were observed for the films deposited at 50 % duty cycle.
Studies on Nanostructure ITO Thin Films on Silicon Solar Cells
Authors: Balasundraprabhu Rangasamy , Monakhov E.V. , Muthukumarasamy N. , Svensson B.G.
Published: April 2013

Nanostructure ITO thin films have been deposited on well cleaned glass and silicon substrates using dc magnetron sputtering technique. The ITO films are post annealed in air using a normal heater setup in the temperature range 100 - 400 °C. The ITO film annealed at 300°C exhibited optimum transparency and resistivity values for device applications. The thickness of the ITO thin films is determined using DEKTAK stylus profilometer. The sheet resistance and resistivity of the ITO films were determined using four probe technique. Finally, the optimized nanostructure ITO layers are incorporated on silicon solar cells and the efficiency of the solar cell are found to be in the range 12-14%. Other solar cell parameters such as fill factor(FF), open circuit voltage(Voc),Short circuit current(Isc), series resistance(Rs) and shunt resistance(Rsh) have been determined. The effect of ITO film thickness on silicon solar cells is also observed.
Preparation of Hollow Glass Microspheres (HGMs) from Amber Coloured and Borosilicate Glass Frits
Authors: Sridhar Dalai  , Vijayalakshmi Savithri , Pratibha Sharma
Published: April 2013

Hollow glass microspheres (HGMs) are a unique class of materials with interconnected pores in the microsphere walls, which can adsorb, retain and release hydrogen and other gases. In this study, HGMs was prepared from amber coloured and borosilicate glass frits. The glass frits after the preliminary washing and drying was sized to particles below 120 μm. The hollow glass microspheres were successfully fabricated from the glass powder by flame spheroidisation using air-acetylene flame. Effect of glass feed particle size as well as feed rate, in the formation of HGMs was studied. Glass feed particle size >75 μm and that <45 μm were found to give very poor yield of HGMs, whereas particles 50-75 μm gave very good yield for HGMs. Further study of the process parameters and constant monitoring to regulate the process are being carried out in our laboratory to arrive at a correct figure for the yield of HGMs. Characterisation of the HGMs prepared was done using Image analysing system, SEM, and XRD. The composition of the raw material and the product HGMs were determined using ICP-AES.
Sensitivity Studies on Vacuum Deposited V2O5 Thin Films
Authors: Dhayal Raj A. , Suresh Kumar P. , Sabari Arul N. , Mangalaraj D. , Irudayaraj A. Albert
Published: April 2013

Vanadium pentoxide thinfilms have been deposited by vacuum evaporation method and the effect of deposition temperatures on the surface morphology of the prepared sample has been analyzed. Structural and morphological were carried out on the prepared samples, using X-Ray Diffractometer (XRD) and Scanning Electron Microscopy (SEM). The samples deposited at elevated temperature showed nanopetal like structures on their surface which were found to be around 100-200 nm. The formation of the V2O5 phase has been confirmed through TG/DTA analysis which shows a sharp peak around 690°C corresponding to the melting point of vanadium pentoxide. The best sample was subjected to gas sensing analysis and the change in the resistance of the sensing element with respect to the test gas concentration was measured by noting down the resistance at each concentration for various time intervals. Sensitivity of the material linearly increased with different concentration of the test gas.
Thermal Studies on SnO2 Nanoparticles
Authors: Rajamanickam N. , Mariammal R.N. , Ramachandran K.
Published: April 2013

Theoretical and experimental investigations are made here on the mean square displacement (MSD) and Debye Waller Factor (DWF) of rutile structure of tin dioxide nanoparticles. SnO2 nanoparticles are synthesized by simple co-precipitation method and structurally characterized by X-Ray diffraction which revealed tetragonal rutile structure. Rietveld analysis of XRD measurements and phonon moments are used to deduce the MSD and DWF of nano SnO2. DWF of nano SnO2 obtained from Rietveld analysis (0.21 Å2) is large when compared to the value reported for bulk (0.0035 Å2) which is due to the high surface to volume ratio of the nanoparticles.
Hydrothermal Synthesis of Flower-Like ZnO Nanostructures and their Optical Properties
Authors: Sambath Krishnan , Saroja Manickam , Venkatachalam Muthusamy , Rajendran Krishnan , Jagatheeswaran Kumaravelu
Published: April 2013

Flower-like ZnO nanostructures have been synthesized using zinc nitrate hexahydrate and hexamethylenetetramine (HMT) by a low-temperature hydrothermal technique. The prepared ZnO nanostructures exhibit hexagonal wurtzite structure, well-defined flower-like morphology, and a strong blue emission photoluminescence. Flower-like ZnO nanostructures consisting of multilayered petals are formed with the length of about 1 μm. All the flower petals exhibit the tapering feature with the root size of 300-500 nm and tip size of 50-100 nm. The prepared ZnO sample has been studied using x-ray diffraction technique, energy dispersive x-ray analysis, scanning electron microscope and FTIR spectroscopy. The photoluminescence spectrum demonstrated two emission bands, a near band edge (NBE) emission in the UV region centering at 386 nm and a high intensity deep band emission (DBE) in the visible region centering at 483 nm.
Influence of Annealing Temperature on Nanocrystalline ZnO Thin Films Prepared by Sol-Gel Dip Coating Method
Authors: Sivakumar K. , Senthil Kumar V. , Thambidurai Mariyappan , Senthil Thottipalayam Subramaniyan
Published: April 2013

ZnO nanocrystalline thin films have been prepared on glass substrates by sol-gel dip coating method. The ZnO thin films have been coated at room temperature for the pH value of 10 and annealed at 300°, 400° and 500°C respectively. The X- ray diffraction pattern shows that ZnO nanocrystalline thin films are of hexagonal structure and the grain size is found to be in the range of 25-45 nm. Scanning electron microscope images show that the surface morphology improves with increase of annealing temperature. The TEM analysis reveals the formation of ZnO nanocrystalline with an average grain size of 44 nm. The compositional analysis results show that Zn and O are present in the sample. The optical studies shows that the films are highly transparent and exhibit a direct band gap. The band gap has been found to lie in the range of 3.07 to 3.32 nm depending on the annealed temperature suggesting the formation of ZnO nanocrystalline thin films.
Amalgamated Criticality Analysis Methodology
Authors: Liao Ming Li , Jou Yung Tsan , Liaw Cheng Shih
Published: April 2013

Failure mode effects and criticality analysis (FMECA) is a widely useful design tool for enhancing product quality, safety and reliability. Most of the current FMECA procedure is in accordance with MIL-STD-1629A by which to conduct FMECA and criticality analysis, which is able to prioritize the failure modes and undertake limited corrective actions toward eliminating product risks. However, the criticality analysis calculation and its interpretation for a failure mode have some mathematical difficulties and erroneous omissions. To resolve these problems, this study proposes a new amalgamated criticality analysis methodology, which is knowledge-based to obtain the four different factor criteria and then using the maximal entropy ordered weighted geometric averaging (ME-OWGA) approach to compute the criticality numbers for a system. This study evaluates criticality analysis in the context of a communication system; the experimental results demonstrate that the proposed method is both accurate and provides discriminating analysis information that helps decision making in product design processes.
UWB Based Detection with Fractional Fourier Transform
Authors: Waheed Abdul
Published: April 2013

The importance of UWB radar system for indoor applications is of keen interest. Applications such as across the wall monitoring, through wall detection, intrusion detection and under rubble vital sign detection are of cumulative interest and are also used in modern rescue systems to help the trapped human beings, along with detection and activity monitoring across the wall. In this paper we have studied across the wall detection of presence of different objects by applying the fractional Fourier transform. Computer aided design based simulations for indoor environment are accomplished by using finite difference time domain solution for Maxwell’s equations. Finally, fractal analysis is realized for the collected signals reflected from the objects present across the wall.
A WSN-Based Localization Scheme Considering the Reliability of RSSI Measurements
Authors: Joe In Whee , Park Myung Oh
Published: April 2013

In this paper, we propose a localization scheme considering the reliability of RSSI (Received Signal Strength Indication) measurements in the WSN (Wireless Sensor Network) environment. This scheme attempts to reduce location errors due to indoor obstacles or environmental factors, when location calculations are based on RSSI. The standard deviation is used to evaluate the reliability of RSSI measurements from the reference node. Also, the directional path loss exponent is calculated through learning with respect to the reference node. The experimental results show that the proposed localization scheme improves the performance significantly in terms of location accuracy, compared to the existing RSSI-based approaches.
Solution Research and Application of E-Commerce and Network Information Security Based on Cryptography
Authors: Sun Hong Fei , Lu Rui Ling , Wang Yan Yan , Hou Wei
Published: April 2013

As the development of Internet, E-commerce gradually becomes a new form of business activities; the security of the traditional cryptographic technique application method is under threat too. Not only domestic scholars but also foreign scholars are all devoting themselves to study the solutions faced to business application. Using cryptographic technique with E-commerce to the application of cryptographic technique and the development of E-commerce is very important to practical significance. This paper studied the security problems of e-commerce transactions and analyzed solutions combining the password techniques from the technology angle; moreover aimed at characteristics of E-commerce and the existing problems. The paper uses digital signature technology integration and digital signature design method to put forward the digital signature which is new and original. The E-commerce applies the digital signature to solve security work.
The Latest Research Progress of Personalized Information Recommend Based on the Tag
Authors: Wu Hui Juan , Xu Bao Xiang , Wang Yan Yan
Published: April 2013

In web2.0 era, tag marks that users have become from passive consumers into active information creators. Users can create and use any tags which represent their will freely on the Internet; they can also share all kinds of tags which other users have created. At the same time, personalized information recommendation can solve the problem of the flood of information, so how to conduct personalized information recommendation based on tags has become the focus of many scholars. This paper summarized three categories about the information recommendation model based on tags: Graph theory- based model, Tensor-based model and Topic-based model, then the author put forward the defects of the existing model and the problems that need to be solved in the future, such as how to reduce noise, how to use social network analysis method to study social tag system and so on.
Phase-Controllable Synthesis of Nickel Phosphides Using a New Ligand Myristic Acid
Authors: Chang Jie , Ning Yan Hui , Wu Su Li , Zhang Shu Fen
Published: April 2013

Myristic acid was employed as a new ligand in a facile hydrothermal method to synthesize nanosized nickel phosphide particles with controlled phases at different temperatures. The phases of the as-obtained products were determined by X-ray powder diffraction (XRD) patterns. The morphologies of the products were characterized by transmission electron microscopy (TEM). Experiments indicated that pure Ni2P phase could be prepared at 160°C for 10h when nontoxic red phosphorus and nickel dichloride were used as starting materials in the presence of myristic acid. While pure Ni12P5 phase could be prepared by increasing the reaction temperature to 200°C.
Study of Terbium-Doped Barium Zirconate ( BaZrO3:Tb3+ ) and Cerium-Doped Strontium Zirconate ( SrZrO3:Ce3+ ) and Europium-Doped Calcium Zirconate ( CaZrO3:Eu3+ ) Phosphors
Authors: Wang Bai Bin , Yang Wein Duo
Published: April 2013

This Study Successfully Synthesized Terbium-Doped Barium Zirconate Phosphor and Cerium-Doped Strontium Zirconate Phosphor and Europium-Doped Calcium Zirconate Phosphor Using the Sol-Gel Method. we Employed X-Ray Powder Diffraction ( XRD ) and Energy-Dispersive X-Ray Spectroscopy ( EDX ) and Photoluminescence Spectroscopy ( PL ) to Analyze the Crystal Characteristics and Element Composition and Spectral Characteristics of Three Phosphors.
Body-Efficiency Character Analysis for Mini Optical Current Transformer
Authors: Wang Jia Ying , Zhang Yue , Zhang Guo Qing , Guo Zhi Zhong
Published: April 2013

All-electric ship is the development direction of ship in future. It’s necessary to do some further microminiature research on the optical current transformer used in all-electric ship. The microminiature research has to face the problem which is the influence of environment changes on mini-optical current transformer’s performance. Base on the theoretical model, the influence of environment changes on mini-optical current transformer’s performance has been studied in this paper. For the impact of environmental factors, temperature field and interference field of optical current transformer have been analyzed in detail. The model related temperature stabilization, anti-magnetic field interference feature, response feature with different magneto-optical material’s length. The optimal solution of the body-efficiency character model has been calculated for the design of mini-optical current transformer.
Design of Optical Notch Filters Based on Equivalent Relations
Authors: Juan Zhang , Sen Guo , Xue Li
Published: April 2013

The transfer functions of optical notch filters based on all fiber unbalanced Mach-Zehnder interferometer with fiber ring coupled structure and Michelson Gires–Tournois interferometer structure are presented based on z-transform method respectively. On this basis, the structural parameters between the two kinds of notch filters are revealed to have some certain equivalent relations. With this equivalent relationship, the structural parameters for designing one of the two kinds of notch filter can be conveniently obtained by that of the other of the two kinds of notch filters. A design example of a two notch point notch filter using the method is given in detail in the paper.
Analysis of an Ultrafast MOSFET Based Pockels Cell Driver
Authors: Biryuchinskiy Sergey , Melnikov Konstantin , Melnikov Vladimir
Published: April 2013

Analysis of fast MOSFET based High voltage switch for High Voltage Electro-Optic Devices is presented. Single MOSFET connection is considered by using Laplace transformation. Based on executed mathematical transforms, directions of improvement ways for typical engineering solutions are analyzed. Improvement directions including fastest operation, optical losses minimization, optical behaviors improvement, cost reducing, size and weight decreasing are considered. Modern Optical Arrangements of an Electro-Optic Shutter Schematic are compared. Different schematic designs of Q-Switch Drivers for Pockels Cell are presented. Parameters of constructed based on presented analysis Q-Switch Driver are given.
Experimental Investigation of Neutron Irradiation Effect on Silica-Based Erbium-Doped Fiber Amplifier
Authors: Ma Jing , Liu Qing Feng , Tan Li Ying
Published: April 2013

This paper studied the influence of neutron irradiation on the characteristics of 980nm pumped erbium-doped fiber amplifier(EDFA). After 7 days neutron irradiation, with the total fluence of 1.5×1013n/cm2, radiation induced loss changed little compared with pre-irradiation, maximum difference of single signal and WDM signal between pre-irradiation and post- irradiation are 0.5dB and 0.6dB, respectively. EDFA affected by neutron irradiation got less loss when the input signal power is higher.
Research on Linear Features Change Detection Based on Remote Sensing Image and Vector Data
Authors: Zhang Zuo Chang , Peng Xin , Qi Tian
Published: April 2013

To prompt the present situation and utilized values of fundamental geo-information, this paper focuses on a change detection method based on remote sensing image and GIS vector for linear features. Firstly unilateral vector was taken as original value of linear features; then edge points were picked up by pyramid decomposition and multi-scale template matching, and Ziplock Snake method was adopted to further improve the extraction results; finally buffer zone was constructed to distinguish the changed part. This change detection method proves to have higher degree of automation and more precise, so long as the registration of remote sensing image and vector map is accurate.
A Hot-Carrier Damaged Indicator of MOSFETs by the Low Frequency Noise Measurement Technique
Authors: Chen Shen Li , Yang Hsiao Kuang
Published: April 2013

In fact, the 1/f noise spectrum is correlated with the interface trap density of a MOSFET gate oxide, and the trap density generation in gate oxide is strong dependently on the hot-carrier injection. In this paper, we will investigate this phenomenon and compare with the threshold voltage shifted measured by the static I-V analysis. Eventually, it is found that the technique of the low frequency 1/f noise spectrum is an accurate and sensitive tool to detect the hot-carrier damage.
Ion-Beam Synthesis of InSb Nanocrystals in Si Matrix
Authors: Komarov Fadey , Togambayeva Altynay , Vlasukova Ludmila , Parkhomenko Irina , Milchanin Oleg , Makhavikov Maksim , Tolkynay Murat
Published: April 2013

The results of structural and optical investigation of crystalline Si with embedded InSb nanocrystals are reported. These nanocrystals were synthesized in silicon matrix by means of high-fluence “hot” implantation of Sb and In ions followed by thermal treatment. TEM gives an evidence of nanocrystal formation in implanted and annealed samples as well as an existence of microtwins and dislocation-type defects and substantial residual mechanical strains. We have identified nanocrystals as InSb from RS data. Mechanical strains in “silicon – InSb nanocrystals” system have been evaluated, too.
Entanglement Purification for Quantum Repeater
Authors: Zhou Zhen Zhu , He Wei , Zhu Chun Dan , Wang Ying
Published: April 2013

We study various kinds of entanglement purification schemes for quantum repeater distributed maximally entangled pairs over long distances. We then investigate two protocols in detail, and present that they have the same essence in principle but operated by different means. In order to compare the two different protocols, we introduce a parameter represented the admixture degree of system to show the optimal protocol that is obtainable. Finally, we present that the efficiency of purification protocol relate to the fidelity of the initial states of the system. For the initial state of the system with high fidelity entanglement, we can obtain the required particles after a few iterations.
Design and Controllable Synthesis of Starch-Derived Magnetic Carbon Spheres with Hierarchical Pore Structure
Authors: Yu Chang , Chen Meng , Zhang Xu , Duan Jiang Bo , Qiu Jie Shan
Published: April 2013

Magnetic carbon spheres (MCSs) with hierarchical pore structure were designed and controllably synthesized using corn starch as carbon source and iron nitrate as metal source by a combined procedure of enzymolysis, pre-oxidation and catalytic carbonization. The results show that after enzymolysis, the porous starch precursor inherits the morphology of original starch with round shape and has a number of honeycomb-like pores of ca.1 μm on the outside surface. It has been found that the MCSs materials with hierarchical porous structure can be synthesized only from the pre-oxidized porous starch by the catalytic carbonization technique, evidenced that the pre-oxidation of carbon source is a dominating factor governing the formation of MCs with hierarchical pore structure. Compared with the porous starch, the pores on the surface of the MCSs shrink slightly and vary in a range of 0.3-0.6 μm.
Influence of Different Precursors on the Nitrogenation Temperature of Sm2Fe17
Authors: Zhao Li Xin , Meng Guo Ying
Published: April 2013

Influence of nanoflakes and melt-spun ribbons on the nitrogenation temperature f Sm2Fe17 was investigated. The microstructure, phase structure, properties of the specimens before and after nitrogenation have been discussed. It is interesting found that hard magnetic Sm2Fe17N3 flakes have been synthesized by surfactant-assisted high energy ball milling and nitriding Sm2Fe17 in 3 psi of N2 gas at lower temperature 300 °C and 350 °C for 3 h. The synthesized Sm2Fe17N3 flakes still retained nanostructure and obtained a coercivity of 3.56 kOe. For the melt-spun ribbons, it needs a higher nitrogenation temperature and longer time to obtain the same coercivity values as the nanoflakes.
Determination of Weight Values for Assessment Indexes of Engineering Materials Based on Fuzzy Pairwise Comparison Method
Authors: Li Min , Ma Yu Jun
Published: April 2013

This paper uses fuzzy pairwise comparison method to determine the weight values of assessment indexes of low temperature material of storage tank, which is proposed based on Chinese traditional complementary thought pattern by Chen Shouyu. For the little difference between the results of study by this method mentioned in this paper and analytical hierarchy process, the main reason in essence is given finally.
Analysis of Microstructures and XRD of a Gradient Boron Alloyed Composite Material
Authors: Xie Guo Liang , Wang Qiang Song , Mi Xu Jun , Xiong Bai Qing , Han Jing Tao , Liu Jing , Jiang Zheng Yi
Published: April 2013

A new type of gradient boron alloyed composite material, containing boron alloyed core layers and stainless steel coatings around the core, were designed and prepared by composite casting and hot rolling. The evolution of microstructures, phases and precipitations, as well as their influence on hot rolling process and performance are investigated. A mixture of austenitic matrix and uniformly distributed borides are obtained in the hot rolled stainless steel with 2-2.5 % boron, while massive borides are in the length of 80-120 μm together with micro gaps at the interface between the borides, and the matrix is remained after hot rolling for the core layers with higher boron contents. Hot deformation would be hindered since more precipitations of these orthorhombic or tetragonal phases occur with an increase of the boron concentration in the core layers.
Molecular Dynamics Optimization of a Computational Model of TACE and its Substrate Peptide
Authors: Sen Liu , Ma Xiao Hong
Published: April 2013

Tumor necrosis factor-alpha converting enzyme (TACE) is a very important membrane-bound proteinase, and it can cut a lot of membrane proteins to their released form. Many of the substrates of TACE are critical protein factors, such as IL-6, TNF-alpha, EGF receptor. Therefore, TACE has been a hopeful drug targets in many diseases. However, selective inhibitors against TACE with high specificity has yet been developed successfully, partly due to the lack of the understanding of the TACE substrate interaction details. To solve this problem, here we build a computational complex model of the TACE catalytic domain and its substrate peptide using the protein design software Rosetta. To further optimize the complex model, molecular dynamics analysis was performed in NAMD with explicit water molecules. The result showed that our complex model is a pretty reliable intermediate model for TACE and its peptide substrate. This complex model could be very useful for further study of the substrate specificity and selectivity of TACE.
Surface-Enhanced Resonance Raman Scattering Spectral Probe Based on Functional Nucleic Acid and Nanoparticle
Authors: Liu Qing Ye , Wen Gui Qing , Ye Fang Gui , Liang Ai Hui
Published: April 2013

Highly sensitive and selective surface-enhanced resonance Raman scattering (SERRS) spectral detection technique are developed by combining the functional nucleic acid (FNA) including aptamer and DNAzyme, and nanoparticle such as gold/silver (NG/NS) aggregation. The recent progress of SERRS was reviewed in this paper.
Research on Synthesizing Phenylic Phenolic Resin of Foundry Binder System
Authors: Hu Ting Ting , Ren Guo Qiang
Published: April 2013

Resin in the foundry polyurethane binder is asked to be phenylic phenolic resin.The composition of the resin influences the capability of the polyurethane binder.In this paper.We studied on the synthesizing phenylic phenolic resin and obtained the better optimal technology conditions as following: used feculent point （80~90°C）to terminate the experiments;the optimal molar ratio of phenol to formaldehyde is from1∶1.5 to 1∶1.75;the formaldehyde concentration is 50%;the amount of catalyst is 0.05%~2% of the phenol.Phenylic phenolic resin that we get can enhance the strength of foundry cores and molds obviously.
Finite Element Analyze on the CFRP Steel Reinforced Concrete Filled with Steel Tube Column under Biaxial Load
Authors: Wang Bin , Sun Peng Ju , Wang Xin , Xu Ya Feng
Published: April 2013

The paper focuses on the research of mechanical behavior of the CFRP steel reinforced concrete filled with steel tube column under biaxial load. The authors make a simulated analysis mode with the general finite element analyze software, ABAQUS. By the way of unit selecting, meshing, contact setting, the mode is calculated by the ABAQUS/Standard which is used to analyze the mechanical behavior of the specimens. Based on comparing the load-displacement curves under different axial compression ratios, it can conclude that with the increasing of compression, the ultimate load reduces obviously. At the same time, the ductility coefficient also descended slowly. All the ductility coefficients of different specimens are all larger than 2, which meet the code very well. So the mechanical behavior of the column is very well.
Study on the Effect of Porosity on the Reflection Coefficient and Wave Pressure on the Partially Perforated Plates
Authors: Chen Xue Feng , Zhang Mei
Published: April 2013

2D numerical wave flume is established based on the VOF method and k- model to numerically simulate the interaction of wave with perforated plates. The internal source generation of wave is applied in making wave area whose end is placed the sponge layer to absorb the reflection of wave. The numerical results of reflection coefficient before perforated plate are compared with the experimental results of reference (Liu, 2008) to verify the numerical method. By changing porosity, the effect of porosity on reflection coefficient can be analyzed. Moreover, the pressure difference between the outer and inner of perforated plate was studied, and then the mutual influence of porosity on the pressure difference is obtained according to the substantive numerical results.
Dynamic Response of Local Indentation of Sandwich Constructions under Low-Velocity Impact
Authors: Xie Zhong You
Published: April 2013

Sandwich constructions with a lightweight core are more and more widely applied, which are liable to local indentation when subjected to concentrated loading. Dynamic response of sandwich constructions under low-velocity impact is predicted based on the quasi-static indentaion law in our previous study, and the equations of motion are obtained based on damping-mass models. The analytical solutions show a good agreement with numerical ones using the ABAQUS code.
Characteristics of Earthquake Damage for High Core and Concrete-Faced Rock-Fill Dams by Shaking Table Tests
Authors: Yuan Lin Juan , Liu Xiao Sheng , Wang Xiao Gang , Dai Chen
Published: April 2013

The pattern and characteristics of seismic damage for Shuangjiangkou ECRD and Houziyan CFRD models were studied through large-scale earthquake simulation shaking table tests in this work. The test results showed that the main earthquake damage pattern of rock-fill dam is permanent residual deformation and shallow slide on the downstream slope. Seismic residual deformation of rock-fill dam, which is filled and compacted well, is very small. Regardless of ECRD or CFRD, the horizontal displacement and settlement on downstream slope are significantly larger than upstream slope under empty reservoir. The analysis of residual deformation and vibration frequency before and after failure indicated that aseismic performance of CFRD is superior to ECRD. Because of the remarkable whipping effect in the high rock-fill dam, the key parts of aseismic design is downstream slope near the dam top, where appropriate aseismic measures should be taken.
Study on the Effect of Ultrasonic in the Mixing and Cooking of Sizing Material
Authors: Cui Yun Hua , Liu Yi Jie
Published: April 2013

In this paper, the effect of ultrasonic wave on sizing materials is analyzed to optimize sizing properties. To give an overall view on the advantages of ultrasonic wave treatment in mixing and cooking , a range of solid contents are taken into account. By comparing with the traditional method of mixing and cooking, the relationships between sizing materials’(s) gelatinization temperature and time ,viscosity and viscosity stability are discussed. Experimental results have demonstrated that a certain ultrasonic frequency ( 40kHz ) in mixing and cooking method can reduce the gelatinization temperature and time, lower the viscosity of sizing solutions and increase viscosity’s stability.
Model Test and Field Test of the Stability of Large Ultra-Deep Foundation
Authors: Jia Xiao Yun , Zhu Yong Quan , Lin Bao Long
Published: April 2013

Based on the engineering background of Shijiazhuang six-line tunnel of Jing-shi Passenger Line, field measurements and indoor model test are both used to solve the stability issues of large ultra-deep foundation. Surface subsidence, pile displacement, and the force loss of prestressed anchors are analyzed. The results show that the model test and field test is basically the same, prestressed anchor cable can control surface subsidence and horizontal displacement of the pile effectively, so as to ensure the stability of the pit.
Flexural Behavior of High Strength Reinforced Concrete Beams by Replacement Ratio of Recycled Coarse Aggregate
Authors: Lee Yong Taeg , Kim Seung Hun , Kim Jong Hyeon , Baek Sang Ki , Cho Young Sang , Hong Seong Uk
Published: April 2013

Recently, many structures which were built about 30 years ago are watched by reconstruction. Demolished concrete is occurred in the process and these quantity increase about 10% more than the preceding year. Fortunately, recycled aggregates are produced from demolished concrete, whereas the recycled aggregates are not used often because there are not many researches which have been verified by experts or researchers about strength when reinforced concrete is made with recycled aggregates. In this paper, high strength reinforced concrete is valued with potential applications and check change of strength when it made by recycled aggregates. For this, flexural tests of 4 high strength reinforced concrete beams with recycled aggregates were performed, and the high strength reinforced concrete beams were tested within the limits such as compressive strength, flexural strength, ductility, strain, and curvature. The current test data were examined in terms of flexural strength, along with the data from previously tested reinforced concrete beams with recycled aggregates.
Experimental Study on Seismic Performance of the Reinforced Concrete Grid-Mesh Frame Wall
Authors: Qiao Jin Li , Tian Wen Ling , Zhou Ming Jie , Jiang Fang Lu , Zhao Kun
Published: April 2013

In order to validate the seismic performance of reinforced concrete grid-mesh frame wall , four grid frame walls in half size is made with different height-width ratios and different grid forms in the paper. Two of them are filling with cast-in-place plaster as filling material. According to the experimental results of these four walls subjected to horizontal reciprocating loads, we know that the grid-mesh frame wall's breaking form are in stages and multiple modes, and the main influencing factors are height-width ratio and grid form, what's more, with cast-in-place plaster as fill material, could not only improve the level of the wall bearing capacity and stiffness, but also improve the ductility and seismic energy dissipation capacity.
The Experimental Study on Frost Resistance of Gravel Concrete
Authors: Gai Xiao Lian
Published: April 2013

As one of the most important road performances of concrete, the frost-resistance has a direct effect on the working life of the road. The performance can be improved by adding admixture. The research is based on the interior experiments. The frost-resistance experiment is carried out through the different proportion to compare the concrete test-pieces of different cement dosage. Thus, they can analyze the changes of the frost-resistance between ordinary concrete and the one which added air-entraining agent. As a result, it can be known how the air-entraining agent affects the frost-resistance of the concrete.
Numerical Analysis of Frictional Resistance on Embedded Large-Diameter Cylinder
Authors: Zhang Jun , Yao Wen Juan
Published: April 2013

The embedded large-diameter cylinder had been widely used in coastal engineering since it could be embedded into ground directly without excavation. A 3D elastic-plastic finite element model has been established to analyze the distribution and development of the friction resistance on large-diameter cylinder under the wave load. The results show that the development of friction on different areas of the cylinder is unsynchronized. The friction resistance first developed on the outer surface of the structure, after that, the inner friction began to develop. Only in certain areas the firction resistance can achieve ultimate value at the ultimate state.
A Numerical Study on Block Shear Strength of Channel Four-Bolted Connections Fabricated with Austenitic Stainless Steel
Authors: Kim Tae Soo , Kim Min Seong , Kim Seung Hun , Lee Yong Taeg
Published: April 2013

Stainless steel has been utilized on structural members of building due to significant characteristics in its superior corrosion resistance, durability, aesthetic appeal etc. Recently, structural behaviors and curling effect in single shear bolted connection fabricated with thin-walled plane plates have been studied by T.S. Kim. In this paper, finite element analysis (FEA) has been conducted based on the existing test result of channel bolted connections in austenitic stainless steel. The validation of numerical approach was verified to predict the structural behaviors such as fracture mode, ultimate strength and curling occurrence of bolted connections. Curling (out-of- plane deformation) also occurred in the connections with a long end distance like bolted connections assembled with plane plates. The curling caused the ultimate strength reduction and ultimate strength reduction caused by curling has been estimated quantitatively through the comparison of FEA results of FE models with free edge and restrained curling. Additional parametric analysis for FE models with extended variables has been performed. Therefore, the ultimate strengths were compared with current design strengths and reasonable strength formulae for connections with no curling effect were proposed.
Wooden Buildings by the Fire Damaged of Toxic Gases on Personnel Evacuation Influences
Authors: Lin Cherng Shing , Yu Chia Chun , Chen Te Chi , Wang Shih Cheng , Shen Liang Yi
Published: April 2013

A wooden building includes historic buildings, villas, wayside pavilion, and so on. These buildings have one thing in common which is they are resistance fire capacity poor. The ignition point of wood is lower, and when encountering a fire the main structure of the building will be seriously damage. In most cases, these building need to be reconstruction. Also, in the initial stage of burning, smoke and toxic gases tend to hinder people from evacuating likely. Therefore, this paper is to explore monumental buildings of the “Grass Mountain Chateau" in Taiwan, which was burnt down in 2007. For a better understanding of significant parameters such as smoke and toxic gases after burning, and a further simulation of the damage degree of people evacuation, utilize fire simulation software the FDS (Fire Dynamics Simulator) of NIST ( U.S. National Institute of Standards and Technology Association Fire Laboratory) to analyze the wooden building of the case on the fire. Hopefully, to provide advices on fire prevention of wooden buildings and people evacuation by supplying quantitative data of the simulation and analysis, and to decrease the loss of buildings to the minimum and prevent casualties.
Setting Analyse of Cycle Time and Buffer Capacity of Car Shops Base on Simulation
Authors: Jin Xin , Su Jian , Yang Chang Hai
Published: April 2013

Cycle time and buffer size are two basic and important figures during process planning of car plant. Following the mechanizing is higher and higher the random things are more and more in car production system. How to set these two figures is a problem. This paper discusses how to set cycle time and buffer size by simulation. This paper gives out some charts to do analyse of the buffer number.
The Development Technology Policy of Secondary Oil Recovery in the Overpressure Carbonate Reservoir
Authors: Chen Ye Fei , Fan Zi Fei , Ni Jun , Li Yun Juan , Hou Qing Ying
Published: April 2013

Kenkiyak oilfield in kazakstan is a low porosity, extremely low permeability and overpressure carbonate reservoir. There are different reservoir and fracture characteristics in different region. The formation pressure decline seriously and water cannot be injected into the low permeability zone. Referring to the domestic and oversea research achievement, integrating regional geologic characteristics, numerical simulation results and reservoir engineering research results, we optimize a series of the development technology policy, including the reasonable gas and water injection modes and injection opportunity, the suitable well patterns and well spacing. Meanwhile, the development mode of energy supplement in the extremely low permeability and overpressure reservoir is explored.
Application Research of Numerical Simulation in Physical Modeling Displacement Experiments
Authors: Gu Jian Wei , Lu Wang , Zheng Jia Peng
Published: April 2013

Due to factors such as objective conditions, time, and cost, it is impractical to carry out substantive indoor physical modeling experiments. Numerical simulation, whilst serving oilfield computation, is an economic technology with high speed and repeatability. Based on some typical physical modeling experiments, this paper establishes a numerical simulation model on laboratory units which complies with the experiments. This model aims at fitting displacement experimental dynamics and calibrating parameters in physical modeling experiments. Via this modeling and taking the experiment on profile controlling and flooding with weak gel as an example, computations over several schemes are accomplished, which visually reveal the mechanisms of fluid direction change, oil displacement, and injection profile improvement. The results demonstrate this approach a perfect combination of physical model experiment and numerical simulation, therefore can be widely used in a variety of displacement experiments for oilfield development, to achieve comprehensive studies while saving time and cost.
Water Locking Mechanics Characteristics and Countermeasures of Low Permeability Gas Reservoir
Authors: Xu Chun Mei , Wang Xing Hong , Guo Fang Yuan
Published: April 2013

The research goal of this paper is reducing damage of low permeability gas reservoir, utilizing the natural cores which from low permeability gas reservoir as ex-periment model, based on similarity theory conducting the fluid-structure interaction experiment of reservoir fluid and injection working fluid with cores, the experimental results show that the effect of gas well reservoir fluid and external fluid with cores, it is inevitable to produce water locking mechanical for the cores which from low permeability gas reservoir, and carry out the corresponding control measures experiment research, and put forward that add alcohol to injection fluid can inhibit water locking.
The Doubly Fed Wind Power Generator Output Characteristic with the Asymmetrical Grid Voltage
Authors: Wang Huan , Pan Lei
Published: April 2013

The paper describe the imbalance loads、single phase short circuit to ground or bidirectional circuit to ground in the grid can bring unbalanced fault and the asymmetrical grid voltage. In the DFIG the faint imbalance stator voltage can bring much imbalance current, electromagnetic torque and active power would fluctuate. The DFIG performance will deteriorate, the central reason is the negative sequence component of the stator voltage、current with the asymmetrical grid voltage. The comparison between evaluated results and simulation of stator、rotor transient currents when the grid voltage drops is similar much.
Hydrokinetic Analysis of Crankshaft Main Bearings in High-Speed Gasoline Engine
Authors: Yu Xiang Jun , Yang Jing , Wang Yong Shuai , Li Ke
Published: April 2013

To a particular inline-four high-speed gasoline engine as the research object, main bearing lubrication analysis model of four-cylinder engine is based on AVL-Excite Power Unit software and couples the mechanical dynamics with lubricating fluid dynamics. On the basis of this model, we are focusing on the influence of parameters such as grease groove width on the engine main bearing lubrication performance. According to the analysis of simulation results on the minimum film thickness and maximum film pressure, and combined with the analysis report of disassembling the engine, it is easy to know why bearing bushes wear and provide the basis for the optimized design of the crankshaft main bearing. Improving design of the main bearing is more useful for operating requirement.
A Study on Heat Generation Control of a Precision Ball Screw Drive System
Authors: Xu Zhe Zhu , Liu Xiao Jing , Lee In Bum , Ahn In Shup , Lyu Sung Ki
Published: April 2013

In this paper, a novel/well designed high speed/high precision nut air cooling ball screw system was developed to avoid thermal errors which affect the positioning accuracy and the temperature rise of ball screw. In order to discuss the effectiveness of the developed high speed/high precision nut air cooling ball screw system, a series of tests was done. As the results, it shows that the positioning accuracy will significantly improve with the use of the nut air cooling ball screw drive system shown in this paper.
The Prediction Model of the Mechanical Properties of Composite Materials Based on Ant Colony Neural Network
Authors: Wang Jing , Zhu Jie , Zhang Qian
Published: April 2013

In this paper, a prediction model of the mechanical properties of composite materials has been proposed based on the ant colony neural network. The mechanical properties of the materials are the common problems that the various materials must be involved in the practical applications. The testing of the mechanical properties of the composite materials is of great significance to the development and the progress of the theory and the practice of composite materials. The ant colony algorithm takes advantage of the optimization mechanisms of ant colony, which has a strong ability to find the global optimal solution. The candidate group mechanism is added in the ant colony algorithm and the weights of the artificial neural network are trained through using the improved ant colony algorithm. This model has a strong adaptive ability and can be used in the prediction of the mechanical properties of composite materials. Then, the efficiency of the testing of mechanical properties can be improved.
Elastic Rod Based Carpet Loop Pile Trajectory Simulation
Authors: Chen Guang Feng , Huang Qing Qing , Zhai Lin Lin , Li Qing Qing
Published: April 2013

The 3D simulation of tufted carpet pile loops need to calculate the direction loop pile. By simplifying the tufted carpet yarn into elongated elastic rod, without considering the extrusion between loops piles, applying pressure at both ends of loop pile. By analyzing the elastic rod stress deformation and using Matlab simulate to determine the yarn centerline direction with the flexible line. The simulation results show that the obtained yarn centerline path is consistent with the trend of actual loop pile.