bluuebunny/crossref_metadata_2025 huggingface dataset:
Optical and Structural Properties of ZnO Nanostructures Deposited on PSi Substrates
Authors: Azizdzul S. , Amizam S. , Abdullah Saifollah , Rusop Mohamad
Published: March 2013

The optical and structural properties of Zinc Oxide (ZnO) nanostructures is prepared by sol-gel immersion method at different temperature on Porous Silicon (PSi) Substrates. PSi is produced from the Si by using electrochemical etching process. The ZnO solution is prepared by using the sol-gel immersion method. Parameters such as different deposition time were studied. The optical properties of ZnO Nanostructures will be characterized by using PL and SEM. The structural properties of ZnO Nanostructures will be characterized by using XRD. The result of investigation show that the growth of ZnO nanostructures improving as the deposition temperature increase.
Surface Morphology Studies of Carbon Nanotubes Prepared by Thermal Chemical Vapor Deposition Using Fermented Tapioca as a Starting Material
Authors: Aishah S. , Nuraini M.Z. , Nik S.F. , Rusop Mohamad
Published: March 2013

Carbon nanotubes (CNTs) were deposited on silicon wafer (Si) by Thermal Chemical Vapor Deposition (TCVD). The new starting material of fermented tapioca was used as carbon source. The gas flow of Argon (Ar) was constant at 70 bubbles per minute and 20 minutes of deposition time. Before the deposition process, the silicon wafer was coated with Nickel catalyst using spin coater. Various parameters such as vaporization temperature and deposition temperature have been studied. Surface morphology and uniformity were characterized using FESEM. The CNTs were structurally characterized using FESEM at different magnification to see the differences of CNTs growth at different temperature of the starting material. The surface morphology and uniformity of CNTs were dependent to parameters.
Synthesis and Characterization of Carbon Nanotubes from Natural Source - Camphor Oil
Authors: Nazirah S. , Azira A.A. , Rusop Mohamad
Published: March 2013

Carbon nanotubes (CNTs) were deposited on silicon wafer (Si) by Thermal Chemical Vapor Deposition (TCVD). The new starting material of camphor oil was used as carbon precursor. The gas flow of Argon (Ar) was constant at 100 bubbles per minute and 30 minutes of deposition time. Before the deposition process, silicon was coated with mixture of nickel (II) nitrate hexahydrate, Ni (NO3)2.6H2O and ethyl alcohol, C2H5OH using spin coater. Variable parameter which is deposition temperature has been studied. Chemical functional groups of carbon nanotubes were characterized using FTIR while surface morphology and uniformity were characterized using FESEM. The FTIR result shows peaks attributed to multi–walled carbon nanotubes (MWCNT) vibration modes.
The Effect of Drying Methods on Physicochemical Properties of Nanostructured Zingiber officinale Rosc. (Ginger) Rhizome
Authors: Norhidayah A. , Noriham A. , Rusop Mohamad
Published: March 2013

Zingiber officinale Roscoe, family of Zingiberaceae is classified as traditional medicinal that globally consumed as spices, food flavouring as well as remedies to treat women during confinement, to treat stomach upset and diarrhoea.The rhizome has been reported to contain abundant bioactive constituents which are mainly polyphenol and flavonoid. Therefore in this research the effect of cabinet drying (60°C) and freeze drying (-40°C) process during preparation of nanostructure Zingiber officinale Roscoe rhizome on particle sizes, surface morphology, FTIR, as well as Total Phenolic Content (TPC) and Total Flavonoid Content(TFC) were compared. Both drying process affect the particle sizes as well as TPC and TFC value. Finer particle size (254.3+ 9.33) and higher TPC (152.54 mg GAE/ g) and TFC (1.42 mgQE/g) were reported for cabinet dried nanostructure Zingiber officinale Rosc. rhizome as compared to freeze dried. The FESEM Photographs revealed that drying processes did affect the surface morphologies of nanostructure Zingiber officinale Rosc rhizome where cabinet dried produced solid spherical particles with a diameter around 100 – 200 nm and some smaller than100nm. Freeze dried consist of many nanoparticles having rod like structure. Both drying process did not significantly affect the presence of active compounds based on FTIR analysis.
The Structural Properties of Carbon Nanotubes Grown on Porous Silicon-Based Materials by Thermal Chemical Vapor Deposition Method
Authors: Fadzilah Suhaimi Mohd Husairi , Zobir S.A.M. , Rusop Mahmood Mohamad , Abdullah Saifollah
Published: March 2013

In this paper, carbon nanotubes on porous silicon substrate were developed in order to get high quality nanotubes for various kind of application. CNTs were deposited on porous silicon nanostructures (PSiN) at 750 0C on porous silicon by using double-furnace thermal chemical vapor deposition technique. Align carbon nanotubes with diameters of 15 to 30 nm were successfully synthesized on a porous silicon substrate. In this system, carbon nanotubes were grown directly on the p-type porous silicon surface at 750 0C for a total time of 30 minutes. The samples were characterized using field emission scanning electron microscopy and micro-Raman spectroscopy. Align carbon nanotubes (ACNTs) bundle with uniform diameter (~20 nm) were found grown on porous silicon at certain area. Based on micro-Raman spectroscopy result, the peak of silicon at ~520 nm and peak of carbon nanotube (around 1 300 to 1 600 nm) was detected.
Physical Properties of Nano-Structured Zinc Oxide Thin Films Deposited by Radio-Frequency Magnetron Sputtering
Authors: Saurdi I. , Mamat Mohamad Hafiz , Rusop Mohamad
Published: March 2013

In this work, ZnO thin films were deposited by RF Magnetron sputtering at different substrate temperatures in the range of 100-400oC on glass substrate. The thin films were characterized using field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), and I-V measurement, for morphology and electrical properties study. Field emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM) were used to study the structural and morphology of the thin films. The particle size varied from 41nm to 146nm showing that the nucleation of ZnO thin films as the substrate temperatures increased. Higher particle size was observed as the substrate temperatures increased up to 400oC as well as high conductivity of thin films at 400oC.
Optical Properties of Nanostructured Aluminum Doped Zinc Oxide (ZnO) Thin Film for Thin Film Transistor (TFT) Application
Authors: Md Sin N.D. , Mamat Mohamad Hafiz , Rusop Mohamad
Published: March 2013

The properties of nanostructured aluminum (Al) doped zinc oxide (ZnO) thin film for thin film transistors (TFT) are presented. This research has been focused on optical and structural properties of Al doped ZnO thin film. The influence of Al doping concentration at 0~5 at.% on the Al doped ZnO thin film properties have been investigated. The thin films were characterized using UV-Vis-NIR spectrophotometer for optical properties. The surface morphology has been characterized using field emission scanning electron microscope (FESEM). The absorption coefficient spectra obtained from UV-Vis-NIR spectrophotometer measurement show all films have low absorbance in visible and near infrared (IR) region but have high UV absorption properties. The calculated Urbach energy indicated the defects concentrations in the thin films increase with doping concentrations The FESEM investigations shows that the nanoparticles size becomes smaller and denser as the doping concentration increase.
Overview: Zeolite as a Valuable Crystalline Inorganic Material
Authors: Mukhtar N.Z.F. , Abdullah Saifollah , Rusop Mohamad
Published: March 2013

There are continuous interests worldwide in zeolites and we can see it with increasing number of scientific publications of the zeolite. Zeolite is an inorganic material that has very special properties over it. They are characterized by framework structures with uniform pore and channel systems. The term zeolite can be defined as hydrated aluminosilicates belonging to the family of the tecto – silicates, whereas the SiO4 tetrahedral are from three – dimensional super cages. Therefore, the aim of this paper is to study about commercial synthetic zeolite that purchased from Fluka. The results cover by Field Emission Scanning Electron Microscopy (FESEM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffraction (XRD).
Transmittance Enhanced Properties of Novel Encapsulated ITO/Arc-TiO2 Antireflective TCO Substrate Prepared by RF Magnetron Sputtering
Authors: Abdullah Mohd Hanapiah , Mamat Mohamad Hafiz , Musa Mohamed Zahidi , Rusop Mahmood Mohamad
Published: March 2013

In this work, a thermally stable multilayered transparent conducting oxide (TCO) utilizing TiO2 antireflection thin film (arc-TiO2) encapsulated under indium tin oxide (ITO) glass has been prepared by RF magnetron sputtering. The novel tri-functional conducting substrate with blocking layer capabilities has been designed via step-down interference coating structure of double layer antireflection coating (DLAR). The mixed-oriented type between the strongest ITO peak at (222) and a weak TiO2 peaks at (101) orientations have been observed under XRD analysis. The antireflection properties of double-layer ITO/arc-TiO2 is evidence with the existence of two maximum peaks around 410 nm and 750 nm. While, the corresponding reduction in reflectance of about 8% and 2% compared to bare ITO was achieved. The ITO/arc-TiO2 blocking layers conserves the low resistivity of ITO at 2.05 x 10-4 Ω cm, even after oxidizing during air annealing process above 400 °C. These results demonstrate that the multilayered ITO/arc-TiO2 with tailored refractive index by means of annealing treatment is a promising approach to realize a substrate which (a): electrically and thermally stable against processing temperature, (b): sustains the higher transmittance of the substrate even there is increase in total substrate thickness and (c): prevents electron recombination process occurring at the interface between the redox electrolytes and the TCO surface. The stable properties are found to be beneficial for use as TCOs in DSSCs.
Structural and Optical Properties of Nanohybrid PMMA/TiO2
Authors: Aziz N.A.A. , Achoi M.F. , Abdullah Saifollah , Rusop Mahmood Mohamad
Published: March 2013

Preparation of nanohybrid PMMA/TiO2 hybrid was reported by using mixture sol-gel spin coating method. This studied involve modification band gap of TiO2 at different molar concentration of TTiB precursor. AFM image show TiO2 particles encapsulated with PMMA matrix. From UV-Vis spectroscope, we have found as increase of TTiB precursor molar concentration, optical band gap is 3.34 eV, increase in UV-range from 3.25 eV. This study suggested for improvement of optical band gap TiO2 coated glass.
Study on Stress Measurement of the MSG Magnetic Measurement Stress Sensor Based on Composite Properties of Materials
Authors: Wang Tie Liu , Wang Zhong Yi , Wan Wei
Published: March 2013

The magnetic measurement stress sensor is the core of the magnetic measurement stress technology. Magnetic measurement stress sensor using magnetostriction and Giant Magneto Resistance (GMR) theory has good correspondence between stress and magnetic, and been validated scientific and reliable through indoor experiments and engineering applications. This paper gives a method on stress sensor anode calibration, verifies the different performance of the sensor based on different materials, makes an analysis of the error between the theoretical calculations and actual measurements of the standard objects, describes the working conditions of using the sensor and indicates a reasonable match is a prerequisite to obtain the desired signal processing results.
Soot Formation in Propane/Air Diffusion Flames
Authors: Sun Xue , Zhang D.W. , Ning G.L.
Published: March 2013

Soot formation and growth in propane/air diffusion flames in a wide range of mole ratio of propane to air from 0.01 to 0.1 have been studied experimentally and theoretically. The concentration of acetylene, soot yield and particle size have been measured and the growth of soot particle has been simulated from surface growth and nucleation processes. The rate coefficient of surface growth has been correlated with the mole ratio of propane to air and the comparisons of particle size between measured and calculated results have been made.
Degradation of Indoor Ammonia Using TiO2 Thin Film Doped with Iron(III) under Visible Light Illumination
Authors: Wang Shuai Jie , Yu Hao , Gao Xue Qin
Published: March 2013

A type of titania thin film doped with iron(III) was prepared by means of sol-gel method to degrade indoor ammonia (NH3) under visible light irradiation. The photocatalysts was characterized by X-ray diffraction (XRD) and UV-vis spectroscopy. The results demonstrated that the adsorption edge of doped TiO2 thin film had red shifts and the doped TiO2 thin film had a stronger absorption than undoped TiO2 thin film in the visible region. Doping amount of Fe(III) effected the photocatalytic actitivity of Fe-doped TiO2 thin film significantly. The optimal doping amount of Fe(III) was 1%(mole fraction). Using the optimal Fe-doped TiO2 thin film, the removal percentage of NH3 after 9h phtocatalytic reaction under visible light reached 53.1%. The degradation reaction of NH3 was successfully described by the pseudo first-order kinetics. The reaction rate constant decreased with the increase of initial concentration of NH3, which reflected that there was oxidation competition between NH3 and its intermediate during the photocatalytic process.
The Study on the Treatment of Nitrobenzene Wastewater by Heterogenious Catalysts and Electrode Oxidation
Authors: Leng Su , Chen Rui Yang , Chen Song Yue , Liu Miao
Published: March 2013

In the paper, the PbO2-Ti electrodes were characterized by SEM, and introduce the self-made catalyst Fe3+/TiO2 into the electrolytic system to treat the nitrobenzene wastewater, in order to improve the reaction speed and the removal rate of COD and NB and form heterogeneous electro-catalytic oxidation technology. In order to confirm the best removal efficiency of COD and NB, the experiment will study the electrolysis time, current intensity, pH value, and the amount of catalyst. The experimental results showed that the surface of La-doped electrode was dense and had good electro-catalytic properties.
Synthesis of Copper Complexes of Poly [2-(dimethylamino ethyl methacrylate)-B-Poly (oligo (ethylene glycol) monomethylether methacrylate-B-Poly [2-(dimethylamino ethyl methacrylate)
Authors: You Qian Qian , Zhang Pu Yu
Published: March 2013

Three different ratios of double hydrophilic block copolymers poly [2-(dimethylamino) ethyl methacrylate]-b-poly(oligo(ethylene oxide) monomethyl ether methacrylate)-b-poly [2-(dimethylamino) ethyl methacrylate] (PDMAEMA-b-POEOMA-b-PDMAEMA) were synthesized by reversible addition fragmentation chain-transfer polymerization (RAFT), which was one of the controlled/living radical polymerization. The chain structure and component of such copolymers were characterized by spectroscopic studies (FTIR, 1H NMR). The interaction of PDMAEMA-b-POEOMA-b-PDMAEMA copolymers with copper sulfate and copper chloride solution was studied. It was found that the anion SO42-, Cl-1 could have an effect on the structure and coordination of the Cu(II) complexes, which were confirmed by FTIR and scanning electron micrographs (SEM).
Replica Exchange Molecular Dynamics Simulations of Coarse-Grained Polymethylmethacrylate Chains
Authors: Du Bo , Wang Zi Lu , He Xue Hao
Published: March 2013

Replica exchange molecular dynamics simulations of coarse-grained poly- methylmethacrylate(PMMA) chains are performed. The coarse-grained force field for PMMA is developed based on the Iterative Boltzmann Inversion method. The proposed coarse-grained model, successfully reproduced the properties of the polymer melts (especially the melting point) obtained from atomistic simulations /experimental values, opens the door to the determination of the melting point of larger polymers.
Study on Treatment of Ammonia Nitrogen Waste Water by Zeolite-Granule-Adsorbent
Authors: Tian Jing Jing , Guan Jun Fang , Yan Chun Jie , Wang Wen Chao , Hu Lin Qiang , Cao Gang
Published: March 2013

This paper focuses on the zeolite-granule-adsorbent(ZGA)’s efficiency of removing ammonium ion. The ZGA shows good performance with up to 73.41% for ammonium removal on the condition of ZGA loading 6g, contact time 6h, initial ammonium concentration 50 mg/L and pH=6. The adsorption kinetics is best approximated by the pseudo-second-order model, whereas the adsorption isotherm results indicated that Langmuir model provides the best fit for the equilibrium data. Furthermore, with regard to thermodynamic parameters, it was found that Gibbs free energy change (ΔG°) −19.31kJ/mol at T=298K, The negative data indicates the spontaneous nature of the adsorption process.
A Fast Responsive Thermosensivtive P(NIPAM/AA-Na) Hydrogel and its Fire Suppressing Experiment
Authors: Jia Chun Lei , Qun Wang , Tang Kai
Published: March 2013

A fast responsive thermosensitive hydrogel poly((N-isopropy- lacrylamide/Sodium acrylate) (P(NIPAm/AA-Na)) were prepared by free radical polymerization methods. The low critical soluble temperatures (LCST) of the hydrgols is about 60°C in 5%wt aqueous solutions. The heterogeneous macroporous structure was observed by SEM. Deswelling degree of the hydrogel is up to 75% in 60 seconds. The 1A rating wood stacking fire were suppressed with water, colloid extinguishing agent B of Zhejiang University and the thermosensitive P(NIPAm/AA-Na) hydrogel respectively. Radiant heat and the temperature were recorded by several heat probes and thermocouples during extinguishing. The results showed that the fire extinguishing-time of the thermosensitive hydrogel is shortest at the same practical rate of application among the three. Consumption of extinguishing agent is the least. The water damage to the section unfired is low after fire extinguishing. The extinguishing agent residual is easy to clean, so the extinguishing efficiency is high.
Preparation and Capacitive Properties of Polyaniline/Au Film
Authors: Shan Qiu Ju , Zhang Hai Rui , Wang Ji Xiao , Wang Zhi , Wang Shi Chang
Published: March 2013

Polyaniline (PANI) doped with dodecylbenzene sulfonic acid (DBSA) was synthesized by chemical polymerization method, which was dissolved in toluene to prepare the casting solution (PANI, 0.20% w/w). Before casting the prepared solution on the surface of PET to form PANI films, Au was sprayed onto the PET film. The morphology of the obtained PANI/Au films was characterized by field-emission scanning electron microscopy (FE-SEM). The capacitive performance was characterized by cyclic voltammetry and galvanostatic charge-discharge technique in H2SO4 electrolyte under various conditions. The experimental results show that the specific capacitance of the prepared PANI/Au film can reach 280 Fg-1 in 0.50 M H2SO4 electrolyte within the potential range from 0.000 to 0.650 V vs. SCE. The obtained PANI/Au film has extremely high stability which has no obvious decrease for 30000 cycles.
Synthesis of RAFT Molecularly Imprinting Polymer Based on Ionic Liquid
Authors: Qiao Feng Xia , Wang Meng Ge
Published: March 2013

A kind of sulfanilic acid molecularly imprinted polymer (MIP) was synthesized by reverisible addition fragmentation chain transfer (RAFT) process using (4-cyanopentanoic acid)-4-dithiobenzoate (CTA-2) as chain transfer reagent, methacrylic acid (MAA) as functional monomer and hydrophobic ionic liquids, 1-butyl-3-methylimidazolium hexfluorophosphate ([bmim]PF6), as functional reaction medium. The results showed that the obtained MIPs had regular shape with high affinity to sulfonamides, and when it was empolyed as the adsorbtion sorbent of solid phase extraction for selectively extracted the three kinds of sulfonamides (sulfamerazine, sulfadiazine and sulfamethoxazole) from chicken samples, the interferences of chicken matrix could be eliminated efficiently and the recoveries at three spiked leves were satisfied.
Preparation and Tribological Behavior of Self-Lubrication Composites Ni-W-Cr-Fe-Cu-MoS2-Graphite at Elevated Temperature
Authors: Sun Jian Rong , Li Chang Sheng , Tang Hua , Guo Zhi Cheng , Liu Jin Ying Zi
Published: March 2013

The composites of Ni-W-Cr-Fe-Cu-MoS2-Graphite with nano-MoS2 were prepared by powder metallurgy. Its tribological properties were investigated using the UTM-2 Nano+Micro Tribometer from room temperature to 600°C. The effects of amount of MoS2 and Ni-W-Cr prealloy powder, load, and temperature on the tribological properties were investigated and discussed. The results indicated that the addition of 43~45wt.% Ni-W-Cr prealloy powder had a strengthening effect on the hardness, anti-press and tensile strength. The tensile strength of the composite decreases with the addition of Nano-MoS2 and graphite, and the friction coefficient decrease with increase of the additives over the wide temperature range of 25°C∼600°C. The friction coefficients and wear rates of the composites reach the optimization value at 2.5wt.% MoS2,While its wear rates increase with the increasing temperature and load.
The Performance of Recycled Asphalt Materials II
Authors: Liang Jia
Published: March 2013

In the past few years, recycled asphalt materials have been used successfully in asphalt concrete pavement in China. However, there are no results of the performance of using abson method and vacuum rotating reclaim to recycled asphalt. The objective of this study is to investigation of recycled asphalt materials performance of using abson method and vacuum rotating reclaim. Abson method and vacuum rotating reclaim were implemented to analyze the characteristics of different aging degree recycled asphalt in this article. Lanlian-70 asphalt put into pressure aging vessels after the time of 0 hour,5 hour,10 hour,15 hour, 20 hour of aging. Afterwards, the different aging degree asphalt was dissolved by trichloroethylene, and then asphalt solution reclaimed using abson method and vacuum rotating reclaim. In the end, the performances of recycled asphalt were tested, such as viscosity, dynamic shear modulus, phase angle, bending creep stiffness. The characteristics were compared of different aging degree recycled asphalt and origin asphalt. The performances of recycled asphalt are rise of dynamic shear modulus and bending creep stiffness and viscosity, reduce of phase angle compared to virgin asphalt. Decreased value and increased value is minimal so that recycled asphalt materials will not make asphalt ageing for considering equipment and human inevitable errors in the process of recycled asphalt.
The Performance of Recycled Asphalt Materials I
Authors: Liang Jia
Published: March 2013

In the past few years, recycled asphalt materials have been used successfully in asphalt concrete pavement in China. However, there are no results of the performance of using abson method and vacuum rotating reclaim to recycled asphalt. The objective of this study is to investigation performance of recycled asphalt materials using abson method and vacuum rotating reclaim. Abson method and vacuum rotating reclaim were implemented to analyze the characteristics of different aging degree recycled asphalt in this article. Lanlian-70 asphalt put into pressure aging vessels after the time of 0 hour,5 hour,10 hour,15 hour, 20 hour of aging. Afterwards, the different aging degree asphalt was dissolved by trichloroethylene, and then asphalt solution reclaimed using abson method and vacuum rotating reclaim. In the end, the performances of recycled asphalt were tested, such as penetration, softening point, ductility. The characteristics were compared of different aging degree recycled asphalt and origin asphalt. Comparison results indicate that the indexes of recycled asphalt are decease of the penetration and ductility, increase of softening point. However, decreased value and increased value is minimal. Therefore, recycled asphalt will not make asphalt ageing in the process of recycled asphalt.
The Dynamical Property and Abrasion Performance of Polyester Polyurethane/SiO2 Nanocomposite
Authors: Shi Hao , Li Yu Hua
Published: March 2013

Polyester based polyurethane/ SiO2 nanocomposites having the starting nNCO/nOH=2:1 and different concentrations of SiO2 nanoparticles (0, 0.2, 0.5, 1.0 and 2.0 wt %) have been prepared. The morphology, dynamical property and abrasion performance were analyzed using scanning electron microscopy, DMA and DIN abrasion tester separately. The results showed SiO2 uniformally dispersed in the composite. By adding nano SiO2 into the elastomers, the 300% modulus, tensile strength, die C tear of the composite were increased but the elongation and rebound decreased. With the increase of the SiO2 adding amount, tanδ of the composite increased gradually, the abrasion performance increased first and the declined.
Analysis on Crack Propagation Mechanism of Nanosingle Crystal Copper about Holes Influence
Authors: Li Ge , Chen Ming , Liu Zhi Min
Published: March 2013

By molecular dynamics method, the tensile processes of nano-single crystal copper with the crack front existence hole were simulated, and the effect of different hole position to crack propagation mechanism was analyzed. The results indicate that as the hole position and crack tip came more closer, dislocation glide would be more obvious in the model interior under the load, the crack tip opening increased lead to occur the typical crack tip deactivation. The more obvious crack branch approached to the hole position, the easier to occurred crack expansion.
Fabrication of Nano Porous PVDF Beads
Authors: Luo Da Bing , Tao Yang , Xiang Bin , Wang Yan Fei , Liu Han Xing
Published: March 2013

After dissolve PVDF in DMF, porous PVDF beads were prepared by water assistant. The porous beads were better crystallized and possessed greater relative surface than ordinary PVDF. The results suggested that the relative surface of PVDF reach 6.53m2/g while the dripping speed was 0.95ml/min. The material could rise to the modulator to fabricate nanometer fiber polymers.
An Aptamer-Au/MnO2 Nanoprobe for Trace Hg2+ Using Resonance Scattering Method
Authors: Long Jin Qiao , Qin Hui Min , Liang Ai Hui
Published: March 2013

The Au/MnO2 nanoalloy in diameter of 10 nm were prepared, using sodium citrate as the stabilizing agent and NaHB4 as the reductant. An aptamer Au/MnO2 nanoprobe (Apt-Au/MnO2) for Hg2+ was prepared using the aptamer modified. In the pH 7.0 Na2HPO4-NaH2PO4 and NaCl, The nanoprobe reacted with Hg2+ to form double-stranded T-Hg2+-T mismatches, and the released Au/MnO2 nanoparticles aggregated to big particles, which induced an increase in the resonance scattering (RS) signal at 570 nm. The RS signal was linear to the concentration of Hg2+ in the range of 0.1-7.5 nmol/L, with detection limit of 0.06 nmol/L Hg2+. This aptamer modified nanoalloy RS method was applied to detect Hg2+ in water samples, with satisfactory results.
The CO-Simulation Research of Vehicle Active Suspension Based on Fuzzy Control
Authors: Huang Zhi Gang , Ding Jin Gang , Liu Ke , Bao Xiao Dong
Published: March 2013

Based on the vehicle dynamics theory, the 2-DOF active suspension model was studied to establish its dynamic model and the road model. Besides, the fuzzy controller were designed with dynamic deflection of the suspension as the controlling object. The 2-DOF active suspension model was established in Adams/View and the stochastic uneven road model was established in Matlab/Simulink in combination of the fuzzy controller to joint CO-Simulation analysis . The results show that the active suspension can effectively suppress vehicle vibration, and improve the riding performance and security.
Simulation Analysis of Proportional Valve Controlled Cylinder Hydraulic System Based on AMESim
Authors: Xie Ning , Chen Xi , Guo Jin Jin
Published: March 2013

Focusing on the performance of proportional valve controlled cylinder, by using AMESim simulation software, dynamic performance of the system has been simulated. Starting by the control strategy, using Genetic Algorithm,the PID parameters which can affect the hydraulic cylinder position accuracy will be optimized. The simulation results show that the optimized parameters can improve system performance, and achieved excellent results.
Research on the Manufacture of Multi-Sipe Radial Tire Molds by EDM
Authors: Feng Ming Tang , Li Zhi Gang
Published: March 2013

It is a technical challenge to insert sipes in a multi-sipe radial tire mold. The authors have invented a new method to make tire mold patterns by EDM which has solved the problems of inserting the sipes, characterized in that the patterns and sipes can be made at the same time, and as they are made as one body after EDM, there is no need to manually insert the sipes. The multi-sipe tire molds made by EDM meet the technical standards of famous international tire companies, and evaluation results show that this process works very well in the manufacture of complicated tire molds.
A Comprehensive Fuzzy Method in Seismic Disaster Prediction of Urban Rail Transit Girder Bridges
Authors: Ni Yong Jun , Yan Jin Xin , Jiang Hui
Published: March 2013

Based on the earthquake disaster investigation of 123 reinforced concrete girder bridges, altogether eight factors that were the building year, seismic fortification intensity, soil site category, failure extent of ground soil, superstructure of bridge, constructional measures for seismic resistance, heights of the piers and abutments, and the bridge spans, those affecting the seismic performance of bridges were considered in the seismic disaster prediction. According to the principle of maximum degree of membership, the fuzzy evaluation subsets for the different influential factors were determined by empirical statistic method. The corresponding weight coefficients were presented based on the statistical analysis of the seismic damage of 123 existing bridges. Relying on the developed prediction model, a Fortran based calculating program was developed to predicting the seismic disasters of the girder bridges in urban rail transit. It was shown that the method proposed in this paper was feasible through the comparing analysis of the actual seismic damages of the 123 existing bridges. The Fortran program could be planted to the existing GIS system to predict the arbitrary girder bridge in urban rail transit
Numerical Simulation of Laser Soldering about Electronic Connectors
Authors: Liu Yi , Li Xun Bo , Zeng Zhi , Liu Tao
Published: March 2013

A transient thermal model for Micro USB V2.0 electronic connector was created based on 3D finite element method. Then get the laser soldering spots on the temperature and stress the distribution of simulation by ANSYS software. Temperature fields at different time, residual stress in different locations and deformations were analyzed. The result shown that the maximum deformation of metal-pin reached 1.4mm, achieved the process standard.
Thermal Stratification Effects on Surge Line Fatigue Life Based on Finite Element Analysis
Authors: Liu Tong , Yi Shu Bin , Wang Xue Cai
Published: March 2013

Stress of pressurizer surge line due to stratification is calculated with the help of finite analysis software, using both simplified temperature distribution and the temperature fields of CFD simulation result. Stress and displacement of pressurizer surge line are achieved. Evaluation of the fatigue life reduction due to stratification is done by using modified fatigue design curve and referring to environmental fatigue factor. The conclusions here indicate that it can’t be neglected that stratification reduces the fatigue life of pressurizer surge line.
The Thermal Stress Analysis of Langmuir Probe and its Heat Dissipation System Based on the Finite Element Method
Authors: Fang Jun , Xie Yu Shu
Published: March 2013

In this paper, temperature field and stress field have been simulated on a Langmuir Probe and its dissipation system in certain diagnostic equipment under intense radiation in use of Abaqus. The results show that there are strongest thermal stresses on the ceramic barrels inside the system, which would be extremely easy to get broken. The reasons to have such dreadful stresses are discussed in the paper. And improving suggestions to avoid extra stresses are put forward for the structure design of Langmuir Probe and its heat dissipation system due to the simulation results.
Calculation Analysis of Natural Frequency of Pipe Conveying Fluid Resting on Pasternak Foundation
Authors: Chen Bing , Deng Ming Le , Yin Zhong Jun
Published: March 2013

The complex mode method and Galerkin method are applied to analyze natural frequency of pinned-pinned Pipe conveying fluid resting on Pasternak foundation. Compared to the exact solution obtained by the complex mode method, the influence of Galerkin modal truncation to natural frequency is elaborated here, and the influence of Pasternak foundation’s shear stiffness, spring stiffness and mass parameter to truncation error are also focused on in this paper. It is concluded that, within specified flow velocity, the increasing of Pasternak foundation’s shear stiffness and spring stiffness will reduce the truncation error produced by Galerkin method, but, comparing with the former, the latter’s influence can be ignored. It is also founded that the truncation error will increase significantly with the increasing of the mass parameter.
Microstructure-Mechanical Properties Correlations in Composite Grid Structures
Authors: Lu Xai Mei , Ma Yun Fei
Published: March 2013

The composite grid structure, which is highly efficient and strongly designable, posses a variety of excellent performances， such as light weight, high strength, and inherent impact resistance. This paper used experimental methods to investigate the composite grid structure consisting of quadrilateral unit cells. The authors made nine specimens composed of different unit-cell sizes of the grid structure, through a series of static and dynamic load testing on them, examined and further analyzed their mechanical behaviors and energy-absorbing capabilities, as well as compared their mechanical properties, thus found specific (new) correlations between microstructures and mechanical properties in composite grid structures.
The Study of the Influence of Surface Geometric Error on Optical Properties
Authors: Liu Tao Ran , Qiu Xing , Xu Yao Hui , Li Yan Li , Hu Yong , Zou Qing
Published: March 2013

When machining optical part, the surface geometric error cannot be avoided and it can affect optical properties of optical part significantly. So it has far-reaching meanings to study the influence of surface geometric error on optical properties. Based on the evaluation indexes i.e. wavefront aberration, point spread function and modulation transfer function, this paper establishes a model of optical part only with surface error to study the influence of surface error on optical properties with a piece of ring curved lens. The study result indicates with the increment of surface error, the value of wavefront aberration increment increases. Moreover, the transfer capacity of demonstrating object contour decreases.
Sintering of Ti-Doped Tungsten Trioxide Ceramic Targets
Authors: Zhang Zhong Jian , Liu Cun Qi , Gao Ling , Xiao Chao , Yang Hai Tao
Published: March 2013

The Titanium-doped tungsten trioxide (Ti/WO3) targets with high density was prepared by sintering in oxygen atmosphere. The density, bending strength and Vickers hardness were measured. The morphologies and microstructures were characterized by XRD and SEM. The Ti/WO3 targets were used to prepare the film by magnetron sputtering .The film was characterized by Ultraviolet spectrophotometer. The results showed that 1040°C was the best sintering temperature for making Ti/WO3 ceramic targets. The relative density of the target was up to 92.18%. The visible light transmittance of the Ti/WO3 thin films reduced quickly along with the reduction of wavelength. Two absorb peaks at the wavelength of 384 nm and 480 nm were found, which would play an important role in making electro-chromic materials.
Synthesis of Highly Luminescent Glutathione-Capped CdTe-Mn/ZnS Quantum Dots
Authors: Liu Ying Fan , He Wei Feng , Wang Guo Qing , Fang Shao Ming , Sun Yu An
Published: March 2013

A green synthetic route is reported for quickly synthesis of highly luminescent CdTe-Mn/ZnS quantum dots (QDs) in aqueous solution. Glutathione (GSH) was used as capping reagent and thioacetamide (TAA) as sulfur source for growth of ZnS shell on the CdTe-Mn QDs. At the optimum reaction conditions, the results indicate that the GSH-capped CdTe-Mn/ZnS QDs exhibit high fluorescence QYs and the best QY is 58%. These GSH-capped core-shell QDs exhibit excellent colloidal and photostability. This method is simple and environmentally friendly.
Synthesis of Pyrrolidine Substituted Perylene Imide End Capped with POSS Nanoparticle and a Preliminary Study of its Electronic Properties
Authors: Wangatia Lodrick Makokha , Zeng Ting , Sun Bin , Zhu Mei Fang
Published: March 2013

Nanoparticle amino polyhedral oligomeric silsesquioxanes (POSS) substituted at the end core of 1,7 bay amino substituted perylene imide dye (POSS-PDIpy) and characterized using FT-IR and NMR. Concentration dependant UV-Vis absorption showed reduction in aggregation due to double suppression of π-π interaction by pyrrolidine and POSS substitution. Bay substitution of the PDI with pyrrolidine red shifted the maximum absorption peak to near infrared region which is a good condition for maximum light absorption, this may have good potential for use in optoelectronic application.
Micromagnetic Simulation on the Microwave Magnetic Properties of Glass-Coated Amorphous Alloy Microwires
Authors: Di Yong Jiang , Cao Peng Jun , Jia Bi , Jiang Jian Jun
Published: March 2013

The magnetic structure of the glass-coated magnetic alloy microwires were modeled based on the main magnetic domain structure and meshed by finite element method. The magnetic spectrum of the magnetic alloy microwires was calculated based on the micromagnetic theory. The simulation results of the magnetic spectrum of glass-coated magnetic alloy microwires showed that the magnetic anisotropy field increase as the magneto-crystalline anisotropy constants increase. The microwave resonance frequency increased accompanied by the reduction of the permeability and the increase of the magnetic anisotropy field of the glass-coated magnetic alloy microwires.
Micro-Structure and Magnetic Properties of Hexagonal M-Type Ferrite Thick Films Prepared by Tape Casting
Authors: Chen Fu , Chen Zhong Yan , Zhou Yuan , Feng Ze Kun
Published: March 2013

The M-type hexagonal ferrite thick films are prepared by tape casting . The morphology is investigated by scanning electron microscope (SEM), the phase composition is characterized by X-ray diffraction (XRD) and the magnetic properties are characterized by vibrating sample magnetometer (VSM). The result shows that thick film by tape casting has high remanence as 26.607emu/g, high magnetization as 55.236emu/g, high coercivity as 2323.8Oe, and high squareness ratio and a good morphology which is suitable for small and light-weight microwave and millimeter-wave devices .
Research and Verification on Damping Performance of Magnesium Alloy
Authors: Ni Yun , Huang Ya Ling , Tan Wei
Published: March 2013

The paper analyzes the length variety of the crystal gain and sub-crystal gain of magnesium alloy materials during the strain amplitude augmentation in the linearity stage of the material deformation, and then based on G-L model derives the mathematical model of the damping variety durign the strain amplitude augmentation in the linearity strain stage of the magnesium alloys. Consequently, magnesium alloy damping mechanism is studied theoretically. It is proved that the magnesium alloy material has the advantages of high damping capacities. In addition, a comparison test in terms of damping performance is made between magnesium alloy and other alloys, which further confirms the high damping of magnesium alloy and the rightness of the theoretical deduced conclusion.
Structure and Properties of Mo Wear Resistant Coating Prepared on TC4 through Glow Plasma Deposition
Authors: Tian Xiao Dong , Wang Li Jie , Sun Bo
Published: March 2013

Mo wear resistant coatings on TC4 alloy were prepared by glow plasma deposition technique. The coatings were deposited at 850-1050°C for 1-5h. Structure, growth kinetics and tribological properties of the coatings were studied. The results revealed that the coatings were mainly consisted of a Mo outer layer and an interdiffusion zone composed of Mo-containing Ti-based solid solution phase just beneath the outer layer. Rising deposition temperature increased coating growth rate. The hardness of the coatings decreased with rising deposition temperature, which caused coating wear resistance decrease. Wear test demonstrated that the Mo coating wear rate was about 1/30 of the TC4 substrate wear rate under dry friction condition at the load of 98N.
Effects of Hot Extrusion and Aging on Microstructure and Mechanical Properties of Mg-Zn-Si-Ca Magnesium Alloy
Authors: Zhang Xiu Qing , Chen Ge , Wang Yang , Han Min Yu
Published: March 2013

Homogenized magnesium alloy Mg-6Zn-Si-0.25Ca has been hot-extruded and then aging treated for improving the magnesium alloy plastic deformation ability and promoting applications of magnesium alloys. In the hot extrusion process, the influences of extrusion parameters for microstructures and mechanical properties of Mg-6Zn-Si-0.25Ca magnesium alloy were investigated. The results show that dynamic recrystallization occurred during hot extrusion. Compared with as-cast alloy, the grains are fined remarkably, and the mechanical properties are enhanced obviously. Twin crystals appeared in grains after hot extrusion, with the extrusion temperature rising, twin crystal structures has been reduced. Aging further increased the mechanical properties of the estruded alloy. The ultimate tensile strength of Mg-6Zn-Si-0.25Ca alloy is about 385 MPa and the elongation is about 11% when extruded at 320°C(extrusion ratio is 10) and aged at 190°C for 8h.
Dynamic Strain Aging in the Fe-Mn-Cu-C TWIP Steels
Authors: Liu Hai Jun , Zhu Ding Yi , Peng Xian , Hu Zhen Ming , Wang Ming Jie
Published: March 2013

Strain rate jump tests were performed on the Fe-Mn-Cu-C TWIP Steels to determine the strain rate sensitivity, and serrated plastic flow was observed in the stress-strain curves during tensile tests at different constant strain rates ranging from 2.5×10-4S-1 to 2.5×10-2S-1. The Fe-Mn-Cu-C TWIP Steels exhibit high work hardening rate and outstanding mechanical properties, The excellent mechanical properties are attributed to dynamic strain aging(DSA) effect, which result from the interaction between Mn(Cu)-C atom atmosphere, C-vacancy, C-C pairs and moving dislocations.
Investigation of Microstructure and Properties of an Al-Zn-Mg-Cu Alloy
Authors: Li Xi Wu , Xiong Bai Qing , Zhang Yon Gan , Li Zhi Hui , Wang Feng , Liu Hong Wei
Published: March 2013

In this study, the microstructure and properties of an Al-7.5Zn-1.7Mg-1.4Cu-0.12Zr alloy in T74 condition have been investigated using TEM, tensile properties testing, conductivity measurement, fracture toughness testing, fatigue testing, corrosion testing and soaking quench method etc. The results indicate that When T74 tempers are performed, the alloy can obtain a good comprehensive performance with GPII zones, η' phases and η phases as the major precipitates in the matrix and coarser and discontinuous precipitates on the grain boundaries. The alloy also exhibits a good combination of tensile strength, fracture toughness, fatigue and corrosion properties. And the alloy has a good quench performance, after soaking quenched in water, the strength of the forging with 210mm thickness is stable and varies less than 10% along the depth direction.
Orthogonal Experimental Study on the Grinding-Hardened Layer’s Depth and its Uniformity of 45 Steel
Authors: Yuan Wei , Liu Ju Dong , Xu Zhi Long
Published: March 2013

Based on the orthogonal experiment of grinding-hardening machine, this paper studied the influence of depth of cut ap, table speed vw and grinding method gm on the grinding-hardened layer’s depth and its uniformity of 45 steel. The results show that, depth of cut ap is the significant factor affected the average value of grinding-hardened layer’s depth, but the influence of grinding conditions on the uniformity are very limited. In actual application, it should adopt ap=0.6mm, vw=0.4m/min and up-down grinding method to enhance the quality of grinding-hardened layer.
The BP Neural Network Model of Soil Water-Salt Dynamic State Analysis
Authors: Qiang Yu Guo , Zhang Mao Sheng , Li Zhan Bin
Published: March 2013

With the survey data of Luohui Canal Irrigation District, Shaanxi, China as the example, we employed the three-layer feed forward BP network modeling method to study the soil water-salt dynamic state under the comprehensive conditions of the irrigation district, and adopted the Additional Momentum Method and Self-adaptive Learning-rate Adjustment Strategy to modify the back propagation algorithm; on this basis, we employed the default-factor testing method to analyze the sensitivity degrees of soil salt content and soil alkalinity to every factor in the input layer. The results show this model has a high accuracy and can characterize effectively the internal relationships between the change of farmland soil water-salt dynamic state at a shallow water table during crop growth period and its influential factors. Soil moisture content, groundwater salt content and groundwater evaporating capacity are main sensitive factors of soil water-salt dynamic state; the factors interact and affect each other, giving rise to a coupling relationship under complex conditions. Combining the above methods can provide a feasible and effective approach to study the law of soil water-salt dynamic state under a shallow water table during crop growth period, which is a supplement to and improvement in conventional research methods for soil water-salt dynamic state.
Hydrothermal Synthesis and Characterization of Cu-Saponite
Authors: Xie Xian Mei , Duan Lian , Cui Xing Yu , Zhang Jian Ming , Xing Jie
Published: March 2013

Hydrothermal synthesis of Cu-saponite was achieved using copper nitrate and sodium silicate as the raw materials. The mixtures of starting materials were treated under hydrothermal conditions at 60–230°C for 6–48h. The effect of different synthetic parameters such as hydrothermal temperature and hydrothermal time on the structure development of Cu-saponite was discussed. All the samples were characterized by X-ray diffraction (XRD), FT-IR, scanning electron microscopy (SEM) and nitrogen physisorption techniques. The results of the study showed that the obtained Cu-saponite exhibited better crystallinity at 200°C for 36h. Both increasing hydrothermal temperature and the duration of hydrothermal treatment yielded better crystallized Cu-saponite as determined by XRD. SEM micrographs revealed plate-like shape of the synthetic Cu-saponite. The results of nitrogen physisorption measurements showed different synthesis conditions resulted in different adsorption-desorption isotherms.
C (4×4) Reconstruction on Arsenic-Rich GaAs (001) Surface after Phase Transition
Authors: Luo Zi Jiang , Zhou Xun , Wang Ji Hong , Guo Xiang , Zhou Qing , Liu Ke , Hu Ming Zhe , Ding Zhao
Published: March 2013

C(4×4) reconstruction on arsenic-rich GaAs(001) surface after phase transition has been investigated from the experiment and simulation. We found that the c(4×4) As-rich reconstruction structure of the GaAs (001) surface can be best depicted with the model which there are three As-As dimers without Ga-As dimers in a reconstructed unit cell, and these dimers are found to be aligned perpendicular to the As dimers on β2(2×4) surface.