bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis and Characterization of Pure Magnesium / Bio-Glass Composite
Authors: Zaludin Mohd Amin Farhan , bin Jamaludin Shamsul Baharin , Adzali Nor Maizatul Shima , Muhammad Norhamidi
Published: September 2013

In this study, bio-glass 45S5 powder was added to pure magnesium powder to produce the magnesium/bio-glass composite by powder metallurgy method. The composite was synthesized based on 5 wt. %, 10 wt. % and 15 wt. % of bio-glass. The composite was investigated from the point of view of its microstructure, physical properties and in-vitro bioactivity. Microstructural analysis showed that bio-glass was agglomerated with increasing content of bio-glass. Density and hardness of composite increased as the content of bio-glass increased. During in-vitro test, corrosion resistance increased as the content of bio-glass increased.
Mechanism of Current Transport for a Photoelectrochemical Cells of ITO/Cu2O/PVC–LiClO4/Graphite
Authors: Halin Dewi Suriyani Che , Haiza Haroon , Talib Ibrahim Abu , Daud Abdul Razak , Hamid Muhammad Azmi Abd
Published: September 2013

This paper deals with the current transport mechanism of solid state photoelectrochemical cells of ITO/Cu2O/PVCLiClO4/graphite as well as the physical properties of a component of a device affecting its performance. The principle of operation used in the photoelectrochemical cells is presented. The device makes use of ITO films, Cu2O films, PVCLiClO4 and graphite films as photoanode, photovoltaic material, solid electrolyte and counter electrode, respectively. The device shows rectification. The Jsc and Voc obtained at 100 mW cm2 were 3.2 x 10-11 mA/cm2 and 0.92 V, respectively.
A "Green" Rubber Compound for Making Tire Tread with Antistatic Feature
Authors: Yong Kok Chong , Che Aziz Ahmad Kifli
Published: September 2013

Electrostatic charges are potentially generated on a commercial vehicle through several ways, such as friction of its rubber tyres while rolling on the road and also from the rotating of its mechanical components (e.g. bearings shaft). If these accumulated electrostatic charges are not dissipated from the vehicle, interferences of electronic components within the vehicle may occur. Highly accumulated electrostatic charges may also lead to safety hazards (e.g. fires and explosions) for vehicles that transporting highly flammable materials or during the vehicles refueling process.
The Effect of Chemical Modification on Properties of Polypropylene/Bagasse Fiber Composites Compounding Using Two Roll Mill
Authors: Adnan Sinar Arzuria , Sea B.I. , Yusrina Mat Daud
Published: September 2013

This study is concerned on chemical modification of bagasse fiber (BF) filled polypropylene (PP) composites compounding using two roll mill. The fibers were chemically modified with different chemical treatment (alkaline, acetic acid and silane coupling agent). Effect of chemical modification towards BF/PP composites was evaluated by tensile test and flexural test. The chemical modification efficiency was verified by Fourier Transform Spectrometer (FTIR) analysis. From FTIR analysis, there is an increase on intensity on acetyl group (C-H) indicated the existing of chemical bonding between PP and BF. Chemical modified composites increased the mechanical behavior. Composites that modified with acetylation (acetic acid) shows better mechanical properties compared to others.
Growth of Vertically Aligned ZnO Nanorods Arrays by Hydrothermal Method
Authors: Alimanesh Mahmoud , Rouhi Jalal , Zainal Norzaini , Kakooei Saeid , Zainuriah Hassan
Published: September 2013

Well-aligned ZnO nanorod arrays with different average diameters were grown on silicon (100) substrates by hydrothermal method via the precursors of zinc nitrate hexahydrate (Zn (NO3)2 .6H2O) and Hexamethylenetetramine (C6 H12N4) with equal molar concentration at 0.025 mol/l and 0.05 mol/l. The ZnO nanorods were characterized by X-ray diffraction (XRD) and field emission Scanning electron microscopy (FE-SEM). XRD results indicated that all the ZnO nanorods were preferentially grown along [000 direction (c-axis). field emission Scanning electron microscopy images showed that the well-faceted hexagonal ZnO nanorods were grown vertically from the silicon (100) substrates.
Production of Wollastonite from Local Resources
Authors: Noorina Hidayu Jamil , Arif W.M. , Noorhamizah M.S.
Published: September 2013

This project is focused on the production of wollastonite (CaSiO3) from local resources. Wollastonite was produced by milling silica (SiO2) and limestone (CaCO3) in planetary mill for 1 and 5 hours. Samples have been sintered at different temperatures which are 900oC, 1100oC and 1300oC for 1 hour. The raw materials that have been used was collected from surround of state of Perlis and have high purity. This has been proven by X-Ray Fluorescence (XRF) analysis. By observing under Scanning Electron Microscope (SEM), the morphology of wollastonite shows that it has high porosity and disperses homogeneously. The X-Ray Diffraction (XRD) pattern shows that the phase of β wollastonite occurred almost at high temperature which is 1100oC. Besides, the intensity of peak also shows that the wollastonite has crystalline structure. The C-O and C-C bonding is proven by Fourier Transform Infra-Red (FTIR) analysis. The particle size for 1h milling is 26.16μm while for 5h is 16.8 μm.
Electrical Properties of Fresnoite Ba2TiSi2O8 Using Impedance Spectroscopy
Authors: Osman Rozana A.M. , Idris Mohd Sobri
Published: September 2013

Fresnoite with composition Ba2TiSi2O8 (B2TS2) was first found in 1965, adopting a non-centrosymmetric structure. It also reported to crystallize in a tetragonal unit cell with a=8.52Å and c=5.210Å leading to some possible application as hydrophone, transducer and second harmonic generation and low temperature co-fired ceramics (LTCC). B2TS2 were synthesized by conventional solid state reaction. Phase pure B2TS2 was obtained after heating the pellets at a final sintering temperature of 1230 °C in air at 92 h. Study found that Fresnoite B2TS2 is a type of materials which are not ferroelectric and instead show perfect dielectric insulator behaviour with resistance >106Ωcm at temperatures below 750°C and also shows nonideal debye respone. The activation energy for conduction of B2TS2 samples is very high, indicating that these materials are highly insulating.
Kinetic and Thermodynamic Studies on Adsorption of Copper Ions onto Pomelo Peel (Citrus grandis)
Authors: Begum Noorzahan , Noorliyana Aimi , Bari Md Fazlul , Halif Norzilah Abdul , Hidayah Nur , Ahmed Khairel Rafezi
Published: September 2013

The ability of pomelo peel (PP) as natural adsorbent to remove Cu (II) ions from aqueous solution was investigated. The influence of solution pH, contact time and temperature were evaluated. Cu (II) removal increased as the pH of the solution increased and the maximum value reached at pH 6. The adsorption was relatively fast (30 min). Adsorption kinetics followed the pseudosecondorder model. At low temperature the adsorption was not affected but at high temperature it was reduced. PP is considered as low cost material that shows potential to be applied in wastewater technology for remediation of heavy metal contamination.
Fabrication and Characterization of Porous F-75 for Potential Application in Tissue Engineering
Authors: Jamaludin Shamsul Baharin , Leng Tan Wei , Zaidi Nur Hidayah Ahmad , Che Daud Zuraidawani , Mazlee Mohd Noor
Published: September 2013

Porous F-75 (Co-Cr-Mo) was produced by powder metallurgy technique. F-75 powder was mixed with space holder and compacted using different pressures (300 MPa, 350 MPa, 400 MPa, 450 MPa). The green samples were sintered at 1150 °C in a tube furnace under argon atmosphere. Sintered samples were examined in terms of bulk density, porosity, hardness and pore size. Microstructural analysis was carried out using a scanning electron microscope (SEM). Microstructure analysis showed that pore sizes and pore shape were influenced by different compaction pressure. The hardness of the samples increased as compacting pressure increased. Density and porosity remained constant at certain level.
Effect of Spot Welding Current and Cycles on the Mechanical Properties of Welded Galvanized Steel Sheets
Authors: Jamaludin Shamsul Baharin , Mazlee Mohd Noor , Ismail Muhammad Rifki , Ahmad Khairel Rafezi , Hussin Kamarudin
Published: September 2013

Studies on the effects of welding current and cycles were carried on the galvanized steel sheets using spot welding. The welding currents used were 3 kA, 5 kA 6 kA and the welding cycles were 4, 6 and 8. Tensile shear and tensile peel load were determined on the joint of welded specimens. The results showed that the value of tensile shear load was lower than tensile peel load. The strength of the joint increased with the increasing of welding current and welding cycle used in the welding process.
Reliability and Bondability Study on Interfacial Behavior between SnAgCu Solder and Cu-Ni-Au OSP Pads
Authors: Fu Shen Li , Hsu Hsiang Chen , Wan Yue Min , Haung Chi Hau
Published: September 2013

In this paper, micro interfacial behavior for Sn3.5Ag0.5Cu (SAC305) lead-free solder on Cu-Ni-Au substrate has been carefully investigated. It is observed that the intermetallic compound (IMC) ingredients along the SAC305 solder on the Cu-Ni-Ag substrate are (Ni, Cu)3Sn4 and (Cu, Ni)6Sn5 after reflow process. Reliability analysis for IMC ((Ni, Cu)3Sn4 and (Cu, Ni)6Sn5) was conducted based on the measurement of IMCs thickness and ball shear force. Temperature effects were also included in the analysis. The ingredients of IMC remain un-change if the working temperature is below 400 OC. Diffusion rate of interfacial controlled reaction was found to be depended on the annealing temperature. The IMC layer thickness decreased as the ramp-up rate of reflow temperature was increased for all cases studies. Preliminary results demonstrated that the measured ball shear force slightly changed for all different IMC thicknesses.
A Comparative Study of N-Type ZnO and P-Type NiO Nanostructures for the Detection of Aqueous Ethanol Solution
Authors: Zhang Min Ren , Lai Hong Hui , Lee Yi Mu , Lai Chun Hung , Wu Yi Der , Yang Hsi Wen
Published: September 2013

N-type ZnO nanorod arrays and p-type NiO thin films have been prepared on the ITO substrates by chemical bath deposition (CBD) and sol-gel spin coating method, respectively, then followed by thermal treatment at 400 °C for 1 h. The ZnO nanorod arrays have length of around 1.5 μm and diameter of around 55 nm; the thickness of the NiO film is around 340 nm with average grain size of 22 nm. The sensing properties of the n-type ZnO and the p-type NiO for the detection of aqueous ethanol solutions at room temperature are investigated using electrical impedance spectroscopy (EIS). The EIS results reveal that the series resistance (Rs) is as low as 27 Ω; the charge-transfer resistance (Rct) remarkably contributes to the sensing properties of the ethanol sensor, and decreases with a decreasing concentration (99.5%-1%) from 17.0 kΩ to 2.6 kΩ. An equivalent circuit with capacitors and resistors was developed to investigate the conduction process according to complex impedance (Nyquist) diagrams. In low concentration range, the electron conduction process is dominated by the Rct and a constant phase element (CPE); however, in high concentration ethanol solution, the conduction process is dominated by polarization and decomposition of the absorbed water with larger Rct observed. Moreover, I-V measurements were carried out to evaluate the sensitivity of n-ZnO and p-NiO nanostructures at room temperature.
Conductivity Analysis on Hetero-Junction of Multiple Nano-Structural Layers
Authors: Wei Wen Cheng J.
Published: September 2013

Ionic/electronic performance of various cathodes in contact with solid electrolytes used for intermediate-temperature (500-750°C) solid oxide fuel cells (SOFCs) is investigated. Perovskite-type material, e.g. (La,Sr)(Co,Fe)O3 as abbreviated LSCF, mixed with Gd-doped CeO2 (GDC) particulates in various size ranges has been synthesized by Pichini and co-precipitation methods. The composites are assembled into multilayer cathode structure, which is arranged in a sequence of composite/GDC/ YSZ electrolyte. The microstructure of the interface, electrochemical performance, and interface conductivity of various cell combinations are investigated.
Resistance Switching Characteristics in Zirconium Oxide
Authors: Lai Chun Hung , Hsu Hao Hsiang , Lee Yi Mu , Yang Hsi Wen
Published: September 2013

The resistance switching behavior in sputtered Ti/ZrO2/Pt sandwiched structure was investigated for nonvolatile memory application. Multiple current-voltage measurements reveal highly uniform distribution of the conduction current and switching voltage. This bipolar resistive switching driven by bias of proper magnitude and polarity is interpreted by filament model. The reset threshold increases with the compliance setting imposed on the turn-on transition, while the switching currents in high and low resistance states are not varied for different top-electrode areas. Both characteristics are ascribed to the electro-chemical reactions of field-induced reduction-oxidation processes.
Effects of Cold-Spray Coatings on the Corrosion Properties of AZ80 Magnesium Alloy
Authors: Lee Y.J. , Wu S.C. , Chen J.H. , Yeh M.T. , Lin K.M. , Lin H.C.
Published: September 2013

In this study, the coating layers of IN625 and 301 stainless steel powders were deposited on the AZ80 magnesium alloy substrates by cold-spray technique. The crystal structures, cross-section of the coating layers and anti-corrosion capabilities were examined via XRD, SEM, potentio-dynamic polarization and salt spray test. Experimental results show that the coating layers have a few porosities. The AZ80 substratesexhibit a phenomenon of grain refining after the cold-spraying. Meanwhile, these coating layers could improve significantly the alloy’s corrosion resistance.
Characteristics of Micro-Arc Treated Osseointegrated Porous Hydroxyapatite/Titanium Dioxide Coatings on Titanium Metal
Authors: Long Han Yun , Chung Chi Jen , He Ju Liang
Published: September 2013

A rapid and sufficient osseointegrating functions is obviously essential to the patients who suffered the bone reconstruction period. In order to perfectly target this issue, a single-stage micro-arc treated (MAT) coating beneficial from its inherent porous morphologies with controllable pore sizes, strong adhesive force between coatings and substrate and wide selections in electrolytes, is considered. Hydroxyapatite is extensively utilized and identified as mimic composition to human bone and an active bone ingrowth function. However, a controllable high-purity HAp phase via one-stage MAT has not yet been achieved. This study therefore prepares high-purity HAp coatings using one-stage MAT with the electrolyte combination of Calcium acetate and sodium biphosphate dihydrate on a titanium surface through a systematical evaluation of various MAT parameters, including Ca/P ratios of the electrolyte, electrolyte concentrations, working voltages, and treatment periods. Analytical results show that high-purity HAp can grow at a relatively high Ca/P ratio and electrolyte concentration when combined with a relatively high working voltage and long treatment time, which would otherwise grow with CaTiO3 and/or anatase TiO2 and/or rutile TiO2 simultaneously. Additionally, CaTiO3 acts a precursor phase for HAp formation. Ultimately, the highest purity of HAp coating is obtainable on metal titanium using a Ca/P ratio = 2.16 and applying a working voltage of 450 V for 10 min using one-stage MAT. This highest purity of HAp coating also presents excellent level of Ecorr than that on raw Ti alloys. The high Ecorr of HAp coating contributed from its thick and dense oxide layer by working voltage via one-stage MAT, consequently promises its satisfactory protection. The HAp coating demonstrated in this study not only provides the effective approach to produce the desired purity of HAp coatings but compromises its resistance to SBF. The bioactive HAp coating on Ti alloys via one-stage MAT, thus, considers as one significant surface modification for artificial hip joints and dental implants.
Investigation on the Bending Ratcheting Behavior of Pressurized Z2CND18.12N Stainless Steel Elbows
Authors: Chen Xiao Hui , Li Duo Min , Zhu Jian Bei , Chen Xu
Published: September 2013

A series of ratcheting experiments and finite element analysis simulation under bending loading for Z2CND18.12N stainless steel elbows were carried out. Chaboche and modified Ohno-Wang model are applied to evaluate structural ratcheting response simulations. It is found that ratcheting strain initiates firstly in the hoop direction and increases in the axial direction with the increasing of loading. The Ratcheting strain rate grows with the increase of the reversed in-plane bending load or internal pressure for both specimens with different loadings. Comparison of simulation and experiment showed that modified Ohno-Wang model presented simulation more reasonably.
The Effect of Heat Treatment on the Performances of Inconel690 Heat Transfer Tube
Authors: Zheng Wen Jie , Song Zhi Gang , Feng Han , Wang Zi Jun
Published: September 2013

This article mainly studied the influence rule of heat treatment temperature on the performances of Inconel690 heat transfer tube. The microstructure, mechanical performances and corrosion properties were studied under different heat treated conditions. The optimized heat treatment process was obtained. The conclusions was as follows: with the increase of solution temperature from 1050°C to 1150°C, the mean grain size varied from 12μm to 58μm, the room temperature tensile strength and yield strength reduced gradually, while the elongation elevated gradually. The alloy had a good resistance to pitting corrosion after solutionization during 1090~1100°C.The massive carbides (M23C6) were precipitated along grain boundaries after sensitization processing. And with the increase of sensitization temperature, its morphology transform from tiny semicontinuous to coarsening continuously, multi-layered distribution emerged during higher sensitization temperature range. Along with the sensitization temperature rising, alloy 690 has better resistance to intergranular corrosion. As the sensitization temperature was higher than 750°C with isothermal holding for 2 hours, the desensitization phenomenon occurred, and the ability of anti-intergranular corrosion for alloy 690 could be enhanced distinctly.
Corrosion Performance of Polypyrrole Coated Type 304 Stainless Steel for Bipolar Plates of Proton Exchange Membrane Fuel Cell
Authors: Ren Yan Jie , Chen Jian , He Jian Jun , Zeng Chao Liu
Published: September 2013

Polypyrrole coating doped with dodecylsulfate anions was electrodeposited by cyclic voltammetry and constant current technique on type 304 stainless steel used for bipolar plates of a proton-exchange membrane fuel cell from a basic solution of 0.2M pyrrole monomer solution containing dodecylsulfate sodium as supporting electrolyte. The morphology and corrosion performance of Ppy coated samples were investigated. Microscopic observations showed that the polypyrrole synthesized by constant current technique present a more dense constitution. Electrochemical measurements in 0.1M HCl solution showed that the polypyrrole synthesized by constant current technique provided better protection for the stainless steel.
Rapid Assessment Method of Girder Bridge Carrying Capacity Based on Traffic Running Test
Authors: Li Wei Zhao , Huang Xiao Min , Li Yan
Published: September 2013

The dynamic response under running vehicle of the bridge includes the static response. The frequency components of simple supported beam dynamic response under the uniform constant force and the harmonic force were discussed. A method using the low pass filter to extract the static displacement from dynamic response curves was proposed and extended to the continuous girder bridge. Simulation analysis describes the process of extracting static displacement. The results show that the method is effective to separate the static and dynamic compositions from the vibration deflection. The dynamic deflection curves of an actual bridge was studied to get the generalized influence lines and then vehicles were laid on them as the static load test program to estimate the static deflection. The results of research show the estimative deflection has high precision and meets the requirements of the bridge inspection. This method can replace the static load test for rapid assessment of the girder bridge.
ANSYS-Based Spatial Coupled Vibration Analysis Method of Vehicle-Bridge Interaction System
Authors: Huang Xin Yi , Zhuo Wei Dong , Shang Guan Ping
Published: September 2013

An ANSYS-based spatial approach of analysis is proposed for the bridge-vehicle interaction to investigate the dynamic responses of a curved concrete box girder bridge and vehicles. The governing equations of a vehicle model with twelve-degrees-of-freedom (12DOF) are derived from the energy method using the Lagrange equation of motion. Both the bridge and the vehicle system are discretized adopting element type BEAM44, MASS21 and COMBIN14 in the ANSYS program. The interaction forces between the vehicle and bridge are deduced considering the road surface roughness and its velocity term based on the compatibility conditions of the contact points, and detailed formula are presented. The separate iterative algorithm is developed to solve the vehicle-bridge interaction problem. A three-axle cargo truck and a dual-cell box girder curved overpass bridge are chosen for both numerical and field test analysis. The dynamic properties and the dynamic responses of the bridge are both obtained from the numerical and experiment way, and the results agree well with each other by comparison. Its indicated that the procedures presented in this paper can be taken for the further vibration analysis study of curved concrete box girder bridges.
A Practical Method for the Construction of the Supporting System of Covered Excavation of Metro Station
Authors: Jin Bao , Zhao Hai Yun , Liu Yang
Published: September 2013

This paper proposed a practical construction technology for the supporting system of covered excavation of deep foundation pit enclosure structure in urban subway. With the proposed method, the optimal management of the construction process was carried out in order to alleviate the construction difficulty, and a relative fast construction process was implemented. Finally, the proposed method was successfully applied to the construction of a practical metro station.
Development and some Key Issues of Modal Parameter Identification in Bridges
Authors: Hu Guo Hai , Ma Cheng , Yang Chang Xi , Liu Yang
Published: September 2013

In this study, the modal identification methods based on time and frequency domain are summarized, and the working condition, identified accuracy and some fundamental idea of these approaches are discussed. By comparing the characteristic of different identification method, the identification technique based on ambient excitation is promising in bridges since it is difficult to measure the excitation information. Some challenge and key issues of modal identification of bridges are pointed out in the last part.
Prospect Analysis of the Application of BFRP Bar to Bridges
Authors: Zhang Shao Yi , Shan Wei
Published: September 2013

Basalt Fiber Reinforced Polymer (BFRP) bar was deemed as a substitute material of steel bar owing to its strong tensile properties and corrosion resistance which is benefit to enhance the durability of reinforced concrete bridges. Based on the current research findings, the prospects of BFRP bar for the application to bridges were analyzed. It was concluded that BFRP bar had more widely application to bridges than steel bar owing to the advantages of BFRP bar in the mechanical performance of resisting the corrosion. Meanwhile, two key points of whether BFRP bar could be successfully applied to bridges were also discussed, i.e., the bond-anchorage properties between BFRP bar and concrete as well as the manufacturing technique of anchorage device of BFRP bar.
Parameter Analysis of Vehicle-Bridge Coupling of Half through CFST Arch Bridge due to Vehicle
Authors: Xie Xu Fei , Ding Ji Wu
Published: September 2013

As a new structure type, arch bridge of concrete filled steel tube (CFST) has many merits and unique dynamic characteristics. Some present researches indicate that the CFST arch bridge has obvious impact effect, but the research on its dynamic performance due to vehicle is relative backward. In this paper, power spectral density function is selected to simulate the roughness of pavement, the dynamic equation of vehicle-bridge is built with seven degrees of freedom vehicle model. Based on separated iterative method, the parameters’ influence of CFST arch bridge on dynamic performance due to vehicle is carried out systematically. The analysis results are useful and helpful for the design theory of impact effect of CFST arch bridge.
Modified Damage Assessment and Repair Design for Underpass Bridge Based on Fire Effect
Authors: Li Zhong Long , Wu Hong Lin , Zhu Xiao Di , Gu Hong Jiang , Liu Zhen Yu , Yin Tao
Published: September 2013

Due to the fire effect, a frame underpass bridge had suffered a huge damage in Changjiang road in Harbin in the direction to Acheng. One span of the bridge was burned in large area, parts of which were burned badly. Many adjacent beams turned black at bottom of roofs; parts decoration of side wall were damaged to some extent. As a result, both directions of the traffic were disrupted, causing traffic jams. To make sure of repairing and restoring the traffic during the shortest period, Harbin municipal committee established the Changjiang road rescue headquarters. Under the precondition of utmost to save money and ensure that the repaired underpasses technology standards meet the design requirements, the research group were about to use steel plate or carbon fiber sheet as the reinforcing material, after detecting and identifying the bridge damage. Through a comprehensive consideration for the ascension of normal section bearing capacity of two reinforcing materials, pasting carbon fiber sheet was adopted to complete repair reinforcement scheme.
Investigation of the Optimal Construction of the One-Cave Tunnel with Double-Arch Section
Authors: Jin Bao , Zhao Hai Yun , Liu Yang
Published: September 2013

This paper investigated an optimal strategy of constructing the tunnel with double-arch section, which the one-cave benching tunneling construction and twin side heading construction were replaced by the center drift combining CRD method and the center drift combining twin side heading method. And the proposed measure was applied to construct the back-turning section of the Clover Park Station which was located in metro line 2 Nanjing, China. The economy and practicality of the proposed method was demonstrated by the application to this practical tunnel
A Novel Conjugated Polyfluorene: Synthesis, Characterization and Application in Flow Injection Electrochemiluminescence for Detection of Bovine Serum Albumin
Authors: Li Shu Ai , Wang Shao Wei , Chu Cheng Chao , Wang Xiu , Yan Mei , Yu Jing Hua , Ge Sheng Guang
Published: September 2013

Driven by the urgent demand for novel electrochemiluminescence reagents, a water-soluble polyfluorene derivative, poly [(9,9-bis (3-((N,N-dimethylamino)N-ethy-lammonium) propyl)-2,7-fluorene)-alt-2,7-(9,9-p-divinylbenzene)] dibromide (P-2), was designed and success-fully synthesized. Ultraviolet-visible spectroscopy and fluorescence spectroscopy were used to characterize the formation of P-2, and the results showed that P-2 had strong fluorescence intensity. More importantly, electrochemiluminescence (ECL) of the prepared P-2 was also observed when the applied potential was cycled between 1.0 to 2.8 V at 100 mV·s-1 in phosphate buffered saline buffer solution (pH 8.20). Based on the stable ECL performance, an ECL system for bovine serum albumin (BSA) was constructed. Under the optimal conditions, the enhanced ECL intensity was linearly correlated to the concentration of BSA over the range of 5.0×10-8-1×10-4 g·mL-1 (R=0.9996) with a detection limit of 1.26×10-8 g·mL-1 (n=11). This work not only introduced a substitute for traditional ECL regents, but also proposed a simple ECL system for other analytes.
Analysis of Prospecting Model of Xiongcun Cu (Au) Deposits Xietongmen County, Tibet
Authors: Wang Jian Guo , Zheng You Ye , Gao Shun Bao
Published: September 2013

It is one of large copper mine which discoveried newly in the middle of arc-magma-metallogenic belt in Xiongcun Cu (Au) deposits, Xietongmen county, Tibet. In order to analyze deposits model, the methods adopted includes that arrangement of existing geophysical and geochemical exploration results, familiar with the former research results, and based on the collection of data, studying comprehensively the geological characteristics of deposits, discussing the deposits genesis. It found that metal mineral combination about the Cu (Au) ore body is pyrite + chalcopyrite + molybdenite (less) + magnetite (less), and transit to a peripheral area of pyrite + chalcopyrite + magnetite, to sphalerite + chalcopyrite + pyrite + lead ore (less) from inside to outside in porphyries body in Xiongcun by studying, which reflected the rock permeability and diffusion about the hydrothermal system of ore-bearing porphyry, all this caused by different types of mineralization process due to temperature and pressure reduction. Elements in the vertical direction with zoning characteristics, that is Cu, Au, Ag, As, Sb, (Bi) - Co, Ni - Mo - Mn - Ba - Pb, Zn, Cd, Bi, (Sb) from the center to outward. The elements anomalies and combination is the important geochemical markers to find and evaluate this kind of deposits. Xiongcun Cu (Au) deposits belong to low-grade porphyry type Cu (Au) deposits which related to emplaced hornblende quartz diorite late Jurassic, and is series of island arc type porphyry copper metallogenic of the Gangdese terrane subduction. Deficiency is a lack of data, it is very difficult to distinguish which kind of exploration method played a key role, the division includes both the exploration methods and working train of thought, prospecting cognition. One deposits is likely to belong to this category, and may belong to the other because of the mutual cross.
DABCO-Directed Self-Assembly of Pyrene-Centered Porphyrin Pentamers
Authors: Yuan Zhuang Dong , Wang Jing Xia , Sheng Ning
Published: September 2013

DABCO (1, 4-diazabicyclo [2.2.2] octane) has been used in combination with pentameric zinc porphyrin-pyrene array 1 to form well-defined supramolecular arrays through axial coordination. The self-assembly process has been investigated by a wide range of spectroscopic methods including UV-vis, fluorescence emission and 1H NMR techniques.
Toughness Enhancement by Aligned Multi-Walled Carbon Nanotubes Pullout from Polymer Matrix of Multi-Scale Composites
Authors: Guo Yun Li , Zhu Guo Wei , Qu Peng , Jia Yu Xi
Published: September 2013

There have been tremendous researches on carbon nanotubes (CNTs) and CNTs reinforced composites due to their excellent mechanical, electromagnetical and thermal properties. Radially aligned multi-walled CNTs grown in situ on the surface of carbon fiber or its woven fabric by the chemical vapor deposition method not only provide the significant three-dimensional reinforcement, but also overcome the poor dispersion of nanostructures. In order to investigate how the aligned multi-walled CNTs affect the mechanical properties of the multi-scale composites, a representative volume element is used to simulate the multi-walled CNT pullout process by means of the finite element method. Related influencing factors are taken into consideration: CNT length, CNT Youngs modulus, and the shear strength of the interface between multi-walled CNTs and epoxy matrix, which is characterized by a cohesive zone model. The results reveal that the aligned multi-walled CNTs make a significant contribution to the fracture toughness of the multi-scale composites, and the CNT/epoxy composites with high toughness require relatively high interfacial shear strength, reasonable CNT length and Youngs modulus. The study is helpful for the optimal design of multi-scale composites.
Isothermal Oxidation Behavior of AlN-TiB2 Ceramics Synthesized by SHS-HIP
Authors: Zhou Li Juan , Zhao Yun Xia , Li Hong Bo , Zheng Yong Ting , Meng Fan Tao
Published: September 2013

sothermal oxidation behavior of the AlN-TiB2 conductive ceramics prepared by self-propagating high-temperature synthesis and hot isostatic pressing (SHS-HIP) was evaluated in a temperature range from 900 to 1400 °C for exposure times from 1 to 16 h in air. The oxidation experimental results show that the conductive ceramics have a good oxidation resistance below 1200 °C. The oxidation products on the sample surfaces are mainly composed of Al2TiO5, TiO2 and aluminum borate phases.
Piezoresistive Property of Carbon Fiber Reinforced Plastics
Authors: Zuo Jian Dong , Luo Chao Yun
Published: September 2013

Carbon fiber reinforced plastics (CFRP) were prepared by manual molding technology and the effect of loading speed on the piezoresistive property of CFPR was discussed. The piezoresistive sensitivity of CFRP with the different content of carbon fibers was contrasted and the interface morphology of CFRP was observed by SEM. The results show that CFRP has the obvious piezoresistive property and it can provide early warning as a kind of strain sensor. The piezoresistive sensitivity of CFRP decreases as the increasing of the content of carbon fibers in CFRP. Moreover the piezoresistive sensitivity of CFRP reduced as the increasing of loading speed. The SEM showed that the interface was good between carbon fibers and epoxy resin.
Numerical Analysis on the Influence of Interface on the Mechanical Behavior of Unidirectional Fiber Composites under Different Loads
Authors: Qu Peng , Jia Yu Xi , Zhu Guo Wei , Guo Yun Li , Sun Xiao Chen
Published: September 2013

On the smallest structural scale in the multi-scale structure composites, namely fiber scale, a numerical model was proposed for the analysis on the mechanical properties of unidirectional composites through the representative unit cell (RUC). The progressive method was used to simulate the failure behavior of fiber and matrix, and the debonding between fiber and matrix was characterized by the cohesive zone model (CZM). The failure strength of the unidirectional composite was predicted, and the influence of the interfacial strength on the mechanical behavior of unidirectional composite was discussed. It is shown that fiber dominates the failure strength of the material under the longitudinal load, whereas under the transverse load interfacial properties play an important role in the mechanical behavior of the material. The increase of the interfacial strength can significantly improve the capability of transverse compression and shear resistance.
Interfacial Effect on Bending Property of Al/Cu/Al Laminated Composite Produced by Asymmetrical Roll Bonding
Authors: Li Xiao Bing , Zu Guo Yin , Wang Ping
Published: September 2013

This paper is aim to investigate the interfacial effect on the bending property of Al/Cu/Al laminated composite produced by the asymmetrical roll bonding and annealing. The interfacial microstructure was observed by scanning electron microscope, and the three-point bending tests were conducted at room temperature. It is found that the interfacial layer near the faster roll is about 1 μm thickness and continuous, and the bending strength is increased by 4.4% in comparison with the interface near the slower roll. The results demonstrate that the shear deformation during asymmetrical roll bonding causes a severe interfacial fracture and makes a good interfacial bonding. The increase of bending load is ascribed to the interfacial improvement.
Fabrication of Bifunctional SiO2/Europium-Polyoxometalates/Ag Particles and their Luminescence and Catalysis Properties
Authors: Wang Jun , Fan Shao Hua , Zhao Wei Qian , Li Wu Ke , Lu Xue Lian
Published: September 2013

In this paper, Stöber silica particles were decorated with polyethyleneimine and silver nanoparticles and Eu-polyoxometalates were grafted on the surface of polyethyleneimine/silica spheres. The hybrid SiO2/Eu-polyoxometalates/Ag particles were characterized by IR, UVvis, luminescent spectra, scanning electron microscopy, transmission electron microscope, and cyclic voltammetry (CV), respectively. The hybrid particles show the bright red emission under UV light which can be observed by naked eyes. The luminescent properties of particles have been investigated which show that Ag nanoparticles have an influences on the luminescence of europium ions. The electrochemical activities of SiO2/Eu-polyoxometalates/Ag particles have been demonstrated by CV measurement. The catalytic results indicate that the hybrid particles show the catalytic properties in the oxidation of styrene and benzaldehyde is the main product of the reaction.
Antimicrobial Study of Symmetrical Gemini Cationic Surfactant Based on N-Hexadecyldimethylamine
Authors: Miao Zong Cheng , Wang Yi Wei , Zhang Xing , Zhang Lei , Wang Zhi Xue , Li Yuan Yuan
Published: September 2013

Gemini surfactants generally exhibit superior properties to those of their single-chain analogues with a similar chain length and head group, especially for gemini cationic surfactants. Gemini cationic surfactants have recently attracted considerable attention due to the increasing microbial resistance to common quaternary ammonium compounds. A novel symmetrical gemini cationic surfactant based onn-hexadecyldimethylamine was synthesized through epichlorohydrin andn-hexadecyldimethylamine as rude materials. The chemical structure of the product was confirmed using1H-NMR and FT-IR. The minimum inhibitory concentration of the surfactant toescherichia colirises to 100 ppm, and a higher concentration surely contributes to increase its effect, butstaphylococcus aureusis immune to this surfactant.
Chemiluminescence Enhancement Effect for the Determination of Acetaminophen with the Catalysis of Manganese Deuteroporphyrin (Mn(III)DP)
Authors: Chao Ying Jun , Xie Liang Xiao , Cao Wei
Published: September 2013

It is found thatManganese Deuteroporphyrin (Mn(Ⅲ)DP) can greatly enhance the chemiluminescence intensity of luminol-hydrogen peroxide system in alkaline conditions. Basing on that fact a flow injection chemiluminescence (CL) method has been developed for the determination of acetaminophen. With the peak height as a quantitative parameter applying optimum conditions, the relative CL intensity was linear with acetaminophen concentration in the range of 1.0×10-9～1.0×10-7 g/mL with a detection limit of 2.8×10-10 g/mL. The relative standard deviation (RSD) was 2.7% for 2.0 x10-8 g/mL acetaminophen (n = 11). The proposed method held low detection limit and was successfully applied to determination of acetaminophen in pharmaceutical preparations.
Fabrication of Nanostructured Hierarchical Coatings Composed of Calcium Phosphate/Titanate on Titanium Substrate
Authors: Zhang Cheng Dong , Xiao Dong Qin , Fu Ya Kang , Duan Ke , Lu Xiong , Weng Jie
Published: September 2013

Titanium (Ti) and its alloys have been widely used in orthopedic and dental applications. The bonding between Ti implants and tissues is significantly important in the clinical applications, which is highly relative to the characteristics of implant surface with surface improvement by various coatings such as hydroxyapatite (HA). Meanwhile, the characteristics of modified implants surface can induce special biological response of osteogenic cells to improve the bone-implant bonding. In this paper, in order to improve Ti bioactivity and enhance its osteointegration, calcium phosphate (CaP)/titanate coatings were prepared on Ti with nanoscale surface topographies by a two-step hydrothermal process. Firstly, titanium meshes were treated in sodium hydroxide solutions at two temperatures (200 °C or 240 °C). Then, the treated meshes were immersed in calcium phosphate solutions containing various concentrations of cyclohexane-hexacarboxylic acid (H6L) under hydrothermal conditions. After this two-step process, calcium phosphate deposits, confirmed to be apatite/titanate by energy dispersive X-ray spectroscopy, were successfully formed on the treated Ti mesh surface. These results suggested that this two-step hydrothermal method can be successfully applied to fabricate robust and hierarchical nanostructured coatings of CaP/titanate on Ti implants.
Preparation and Characterization of PVDF Modified Ultrafiltration Membrane for Purification of Hg in Water
Authors: Wang Xiu Ju , Lu Xing Jie , Xu Wei Ying , Zhu Jia Chen , Wang Li Guo
Published: September 2013

The 2-thiol benzothiazole was blended in Polyvinylidene fluoride (PVDF) membrane to prepare a kind of PVDF modified ultrafiltration membrane that could be used to remove mercury ion in water treatment. The water flux and retention rate of BSA of obtained PVDF modified ultrafiltration membrane was 222 L/m2·h and 92.33% respectively. The membrane performance were characterized by infrared spectroscopy (FT-IR) and water contact angle measurement. The results showed that, the PVDF modified membrane presented better adsorption ability for mercury ion than the traditional PVDF membrane. After 4 phases of adsorption/desorption, the modified membrane maintained a mercury ion adsorption amount of 0.264 mg/cm2and the desorption rate could reached 94%.
Optimization of Thermal Emittance Tuneability of La (Sr, Ca)MnO3 Thin-Film Materials in 173-373 K
Authors: Wu Chun Hua , Qiu Jia Wen , Xu Min , Wang Jie Bing , Zuo Hua Ping , Zhang Bai Sen , Li Lin , Zhao Yin Zhong
Published: September 2013

For the purpose of maximizing the thermal emittance variation of La (Sr, Ca) MnO3 thin films in the temperature range 173-373 K, thin film optical mechanism and mathematical optimization method were used to determine the thin film structure, including substrate type, thin film chemical composition and the optimized film thickness. The optimization results indicate the variation amplitude of La (Sr, Ca) film infrared emittance reaches to 0.62, which is 35% more than that of ceramic type smart radiation materials. The designed thin film structure can be used to enhance the thermal control efficiency of spacecraft greatly.
Heat-Treatment Temperature Influence on Structure and Magnetic Properties of SrFe11.85Sm0.15O19 Ferrite Nanofiber
Authors: Meng Xian Feng , Hong Yin Bo , Ji Yong Kang
Published: September 2013

one-dimensional SrFe11.85Sm0.15O19nanofibers were synthesized by electrospinning combined with heating treatments. This paper involved an investigation of how heat treatment temperature and Sm3+influence structure and morphology of nanofibers. FTIR and XRD results demonstrated that SrFe11.85Sm0.15O19magnetoplumbite phase was formed with increasing of calcined temperature, and small amountα-Fe2O3and SmFeO3were detected at low temperature and high temperature, respectively. The calcined temperature had a great impact on the morphology of nanofibers, which changes from a continuous fibrous structure to large plate grain. The VSM results revealed that the Ms and Hc of nanofiber were both increased with calcined temperature.
Cementitious Property Comparison of Steel Slags with Different Basicity
Authors: Li Zai Bo , Zhao Xu Guang , Zhao San Yin , He Tu Sheng
Published: September 2013

For the purpose of high-efficiency recovery and utilization of steel slag in cement and concrete, a comparative research on the cementitious property of several kinds of steel slag in six different cementitious systems have been carried out. The results show that the changes of cementitious systems and the basicity of steel slag have no significant effect on the mortar fluidity. The cooperating use of steel slag and ground granulated blast furnace slag is helpful to activate the cementitious property of steel slag. The basicity of steel slag can generally reflect the long-term cementitious properties of steel slag.
Study on Properties of Al2TiO5 Coating on Ti-6Al-4V Titanium Alloy
Authors: Xie Nian Suo , Wang Jin
Published: September 2013

The Al2TiO5Coating was deposited on Ti-6Al-4V alloy substrate by homemade micro-arc oxidation system. The microstructure of Ti-6Al-4V titanium alloy, the phase of coating, the bonding force of the coating and matrix, sulfuric acid corrosion resistance and high-temperature oxidation resistance were study by inverted microscope model, Xray diffract meter, scanning electron microscopy, the coating adhesion automatic scratch tester, box-type furnace. The results show that the phase of coating is composed of Al2TiO5and Al2SiO5, and Al2TiO5.is the main component, the coating surface consists of discharging pit and flange which are unequal in size, rough and overlap and micro-arc oxidation pit diameter increases with the voltage. When micro-arc oxidation voltage is constant, the longer micro-arc oxidation time, the greater the Ti-6Al-4V alloy coating and the substrate binding force. The corrosion resistance of Ti-6Al-4V alloy was improved in sulfuric acid due to micro-arc oxidation; the sulfuric acid corrosion resistance of the coated samples was improved 11 times when the micro-arc oxidation time increased from 5min to 60min. the high-temperature oxidation resistance of Ti-6Al-4V alloy with micro-arc oxidation coatings is higher than Ti-6Al-4V alloy without micro-arc oxidation coating.
Study on Producing Sand-Lime Bricks with Iron Ore Tailings and Phosphogypsum and other Solid Wastes
Authors: Tao Wen Hong , Fu Xing Hua , Chen Guang Li , Wu Bin
Published: September 2013

The paper studied preparing sand-lime bricks by pressure shaping and nature curing, discussed the stimulation effect of compound activators composed of phosphogypsum and lime. The result shows that: when the proportions of raw materials are as follows: 10~15% weight content is iron ore tailings, 3% is phosphogypsum, 5% lime, 5% cement, 40~45% low quality fly ash, and 22~37% chips, the strength of sand-lime bricks produced gets its highest. XRD and SEM are used to characterize its mineral composition and microstructure. The paper also discussed the relationship between structure and performance inside the bricks, and its hydration mechanism.
Uv-Vis Spectrum Immunosensor Based on a Novel Phenyleneethynylene Derivative Functionalized Silica Nanospheres Labeled Anti-AFP
Authors: Li Long , Chu Cheng Chao , Li Shu Ai , Wang Xiu , Yan Mei , Yu Jing Hua
Published: September 2013

In this work, a novel phenyleneethynylene derivative 4,4´-(2,5-dimethoxy-1,4-phenylene)bis(ethyne-2,1-diyl)dibenzoic acid (p-acid) was synthesized. Based on these we developed a simple and sensitive sandwich-type Uv-vis spectrum immunsensor for α-fetoprotein (AFP).
Thermodynamic Condition and Behavior of Precipitates in Al2O3p/7055 Composites with Cryogenic Treatment
Authors: Wang Hong Ming , Xing Tian You , Li Guirong , Yuan Xue Ting , Zhao Yu Tao , Wang Jun Jie , Gu Kai Xuan , Zhang Hong
Published: September 2013

The thermodynamic condition and behavior of precipitates were discussed about the Al2O3 p/7055 composites subjected to cryogenic treatments. A kind of software named Thermo-Calc was employed to calculate and analyze the mass amount of several main precipitates based on the thermodynamic balance theory. The results demonstrate that when the temperature decreases from 300K to 77K the precipitated amount of T(AlZnMgCu) and θ (Al2Cu) phases will increase. For S(Al2CuMg) phase, at 175K there is a transverse point from increasing tendency to the opposite. It should be noted that η (MgZn2) is the main precipitated phases in compistes ,which accounts for more than eleven weight percent in one mole material. But the balance mass amount lower a little from 300K to 77K. It is analyzed that the volume shrinkage and lattice contract are the main driving forces for precipiting. Due to the difference of heat expansion coefficient among various phases the anisotropic shirinkge lead to micro voids that will act as the nucleation cores,which faciliate the precipitation.