bluuebunny/crossref_metadata_2025 huggingface dataset:
The Effect of Bainitic Transformation Microstructure under Applied Stress on Corrosion Resistance of HQ785 Steel
Authors: Wang Yu Hong , Li Wei Juan , Jin Lan
Published: May 2011

In this thesis, based on the low-carbon bainitic steel HQ785, isothermal transformation tests are carried out on the Gleeble-3500 thermo-mechanical simulator under uniaxial external tensile stress state. The fully immersed accelerated corrosion tests for the specimens, with different microstructure after phase transformation are carried out. The corrosion behavior of experimental steel is evaluated, combing with OM, SEM, weight loss method and electrochemical method. The results show that the shape of phase transformation microstructrue varies from granular to lath with the increase of external tensile stress. The corrosion resistance of which is better than that of granular bainite without stress. The sample with rusty layer after full immersion seawater corrosion shows good protectiveness.
Mechanical Properties of Natural Rubber and Chloroprene Rubber Latex Blends
Authors: Liao Xiao Xue , Tan Hai Sheng , Luo Ming Chao , Tang Bing , Liao Shuang Quan , Wei Xiao Di
Published: May 2011

The effects of the ratios of natural rubber latex (NRL)and chloroprene rubber latex(CRL) and the type of compatibilizer on physical and mechanical properties of latex film were researched.The oil resistance of vulcanized latex film was tested. The compatibility of the latex blends was also analyzed by TG/DTG method.The results showed that properties of latex film were best when ratio of NRL/CRL was 75/25. As the CRL content increased, oil resistance of latex film was improved. Epoxidized natural rubber latex improved compatibility of NRL and CRL blends.
Synthesis a New Diarylethene Bearing N-Propyl as Holographic Optical Recording Medium
Authors: Cui Shi Qiang , Pu Shou Zhi , Liu Wei Jun
Published: May 2011

A new photochromic compound 1-(2-ethyl-3-benzothienyl)-2- (2-n-propyl-5-formyl-3-thienyl) perfluorocyclopentene (1a) was synthesized, its photochromic properties were examined, the result indicated that the color of the compound 1a changed from colorless to a blue one upon irradiation with 297 nm UV light, a new absorption maxima were observed at 578 and 587 nm in hexane and PMMA film, respectively. The diarylethene 1a exhibited relatively strong fluorescence in hexane solution and the fluorescence intensity decreased along with the photochromism upon irradiation with 297 nm light. This new photochromic compound also exhibited remarkable holographic optical recording character.
Influence of Sintering Temperature on the Electrochemical Performance of Sm0.5-XGdxSr0.5Co 3-δ/Gd0.1Ce0.9O1.95 Composite Cathode
Authors: Zhai Ji Min , Song Xi Wen , Zhou Fen , An Sheng Li
Published: May 2011

In this paper, Sm0.5-xGdxSr0.5CoO3-δ (SGSC, x=0 and 0.2) powders were prepared using the solid-state reaction method. Their structure was identified by XRD. All powders formed the perovskite phase when calcined at 1100°C for 5 h. Sm0.3Gd0.2Sr0.5CoO3-δ/Gd0.1Ce0.9O1.95 slurrieswere screen printed onto both surfaces of Gd0.1Ce0.9O1.95 electrolyte and fired at different temperatures to fabricate the composite cathodes. The electrochemical property of the composite cathodes was characterized by the alternative current impedance spectroscopy. The impedance resistance of the composite cathodes increased with the increase of sintering temperature. For instance, the impedance resistance of the composite cathode fired at 1000 °C was 0.0875 Ω·cm2 at 700 °C, while it was 0.175 Ω·cm2 when fired at 1100 °C.
Effect of High-Pressure on the Accelerating Ripening of Gouda Cheese
Authors: Liu Hui Ping , Zhang Xin Yuan , Wei Feng Ru , Li Li Hua
Published: May 2011

On the base of the domestic and international studies, the effect of high-pressure treatment on maturation is analyzed in this thesis. In order to evaluate the quality’s changes of Gouda cheese with different high pressure treatment (50MPa, 225MPa, 400MPa treating 60min) during ripening period, the change of texture properties, microstructure and sensory analysis were measured. High pressure treatment for 60 minutes can accelerate cheese maturing significantly when the applied pressure is higher than 225MPa. The effect of accelerated ripening at 50MPa is not significant. The quality of Gouda cheese treated at 400MPa is the best after ripening 90d.
Quantitative Evaluation of the Glass Forming Ability of (Cu-Zr) Based Glass Alloys with Thermodynamics Method
Authors: Li Hui Qiang , Liu Long Fei
Published: May 2011

Along nucleation → crystalline growth →crystalline fraction → critical cooling rate, the relationship between the nucleation, elements, cooling rate and the Glass Forming Ability of (Cu-Zr) based glass alloys is quantitatively studied with thermodynamics method, and a better method to evaluate the critical cooling rate of glass alloys is also proposed in this paper. The computed results show that: (1) with the increase of element number, the steady state nucleation rate drops gradually. From Cu-Zr, Cu-Zr-Al, Cu-Zr-Al-Ni, to Cu-Zr-Al-Ni-Ti, the peak value of nucleation rate decreases from 1021 mol-1s-1 to 1013 mol-1s-1. It is also found the nucleation rate both drops with the substitution of Ni with Cu or Al with Zr; (2) with the increase of cooling rate, the nucleation rate drops sharply. When the cooling rate reaches 103K/s, the nucleation rates of Cu64Zr36, Cu54Zr42.5Al3.5, Cu55Zr40Al5 and Cu30Zr55Al10Ni5 drop to 109mol-1s-1, 106mol-1s-1, 107mol-1s-1 and 103mol-1s-1 accordingly.
Photochromism of New Hybrid Diarylethenes Bearing a Thiophene and Isoxazole Moiety
Authors: Wang Ren Jie , Pu Shou Zhi , Cui Shi Qiang
Published: May 2011

A new photochromic diarylethene compound 1-[2-methyl-3-thienyl]-2-[3, 5-dimethyl-4-isoxazolyl]perfluorocyclopentene (1o), was synthesized and its photochromic and fluorescent properties were investigated. Diarylethene 1o changed the color from colorless to orange upon irraditation with 297 nm UV light, which the absorption maxima were observed at 486 nm in hexane solution. This new photochromic system also showed remarkable fluorescence switching in the solid state. Finally, rewritable optical storage using 1o was performed. The results demonstrated that the compound was very sensitive responding to 633 nm recording laser.
Microstructures of Co-Continuous SiC/Fe-2Cr13 Composite Fabricated by Vacuum-Pressure Casting and Infiltration Processes
Authors: Yu Liang , Jiang Yan Li , Ru Hong Qiang , Liu Jiang Tao , Luo Kun
Published: May 2011

The microstructure of the matrix and the interface of co-continuous SiC/Fe-2Cr13 (porous SiC preforms infiltrated with the Fe-2Cr13) composites has been investigated by XRD, EDS attached to SEM. Results showed that the reaction zone between SiC and Fe-2Cr13 includes two sections, which are silicon carbide reaction zone (SRZ) and metal reaction zone (MRZ), the MRZ can be divided two sections, one is the poor chromium zone (PCrZ-MRZ) and the other is rich chromium zone (RCrZ-MRZ). SRZ is mainly composed of Fe5Si3, Cr7C3, Cr23C6 and Cr3Si, and randomly distributed graphite precipitates. RCrZ-MRZ mainly contains Cr23C6, while PCrZ-MRZ is mostly made up of Fe2Si.
Study on the Lead-Free Easy-Cutting Mg-Sb Brass
Authors: Li Lei , Ma Biao , Li Qiang , Huang Guo Jie
Published: May 2011

Traditional lead brass is gradually prevented from application by many countries’ governments because lead does harm to human health and pollutes the environment. New types of environment-friendly lead-free brass with favorable machinability are urgently demanded in the electrical, electronics and plumping fields. Lead-free Mg-Sb brass was fabricated in present. Experimental results showed that when the content of Mg is 1.0wt%, Sb is 0.8wt% and Cu is 58.0~59.0wt%, the alloy’s mechanical properties and machinability are favorable for industry application. With the increase of the content of Sb, the machinability increased, while the mechanical properties decreased. Lots of Cu2Mg and Cu9Sb2 particles on the order of microns exist in the inner-grain and grain boundaries. These particles improve the machinability, however, lower the tensile strength and the elongation. A three-way pipe joint was successfully punched with the fabricated Mg-Sb brass bar, and this demonstrated that the fabricated Mg-Sb brass possesses favorable hot working property.
Synthesis, Properties and Application in Optical Memory of a Photochromic Diarylethene Bearing Chlorine Atoms
Authors: Liu Ming , Pu Shou Zhi , Liu Gang
Published: May 2011

A new unsymmetrical photochromic diarylethene compound, 1-(2,4-dimethyl-5-thiazolyl)-2-[5-(2-chlorobenzene)-2-methyl-3-thienyl]perfluorocyclopentene(1a), was synthesized and its photochromism and photo-induced anisotropy was investigated. Diarylethene 1a changed the color from colorless to Orange-red upon irradiation with 297 nm UV light, in which absorption maxima were observed at 479 nm in hexane and at 485 nm in PMMA amorphous film, respectively. It also showed good photochromism and functioned as an effective fluorescent photoswitch in solution. In hexane, the open-ring isomer of the diarylethene 1a exhibited relatively strong fluorescence at 428 nm when excited at 315 nm. This new photochromic system also exhibited remarkable optical storage character.
Degradation of Rhodamine B in Wastewater Using Nanometer TiO2 Film under UV Light Irradiation
Authors: Tian Peng , Shi Zhen Yan , Kang Yan Hong , Liu Gang , Liu Li Yan , Zhang Hui
Published: May 2011

Using tetrabutyl titanate as source, ethanol as solvent, acetic acid as complexing agent, synthesis of titanium dioxide sol was achieved by sol-gel method. A transparent sol aging in air 30min, titanium dioxide films were prepared by using spin coating method. Rhodamine B degradation by TiO2 photocatalysis was investigated. Study the efficiency of decolorization was influenced by the coating times, heat-treated time, the initial concentration of rhodamine B, and solution pH.
Research on Absorbing Properties of Nickel Plating Carbon Fiber-Resin Composites
Authors: Qin Yan , Zhou Yong , Huang Zhi Xiong
Published: May 2011

It is a way of preparing absorbing composite materials when nickel plating carbon fiber is arranged in epoxy matrix orthogonally. The results indicated that after carbon fiber T - 700 was plated by nickel, the absorbing properties were remarkably improved. In nickel plating carbon fiber/resin composite absorbing material, the distance and quality score of carbon fiber in the resin have important influence on absorbing properties. When the distance was between 5mm and 8mm, and quality score is in 0.53wt % ~ 2.16 wt %,we can get the absorbing material that was less than - 5db in the X band and - 10db in the Ku band.
Influence of Annealing Temperature on Microstructure and Magnetic Properties of Ti/Ni/Ti Thin Films
Authors: Feng Shun Zhen , Liu Ji Hong , Hao Pu , Dong Yan Hui , Sun Hui Yuan
Published: May 2011

Ti(3nm)/Ni(10nm)/Ti(3nm) films were deposited directly on glass substrates using dc facing-target magnetron sputtering system at room temperature and in situ-annealed from room temperature(RT) to annealing temperature(Ta) 500°C, respectively. At Ta = 400°C, the gain size was about 15 nm, and the magnetic domains of the films distributed homogenously, and the magnetic domain cluster size was nearly 25 nm. The maximum perpendicular coercivity of Ti(3nm)/Ni(10nm)/Ti(3nm) films was 1360 Oe. The segregation or diffusion of Ti and the stress anisotropy played important roles to increase the coercivity. The intergrain interaction of films was obtained by δM plots. In annealing films, X-ray diffraction (XRD) profiles showed two diffraction peaks of NiTi monoclinic structure (002), (111) lattice orientations.
Synthesis and Characterization of Star-Shaped Porphyrin-Cored Poly(L-lactide)
Authors: Dai Xiao Hui , Liu Wei , Huang Ya Fei , Dong Chang Ming
Published: May 2011

Star-shaped porphyrin-cored poly(L-lactide) (SPPLLA) was synthesized using a tetra-hydroxyethyl terminated porphyrin as a core initiator and 4-(Dimethylamino)pyridine (DMAP) as a catalyst in THF at 50 °C. The molecular weight of as-synthesized polymer were measured by GPC and 1HNMR. It was found that the molecular weight of SPPLLA could be adjusted linearly by controlling the molar ratio of L-lactide to porphyrin core initiator, and the molecular weight distribution was reasonably narrow. Furthermore, SPPLLA polymers showed similar UV-vis spectra compared with porphyrin core initiator. Consequently, this will provide potentially porphyrin-cored poly(L-lactide) for photodynamic therapy.
The Coating Fragile Phase Thickness Measure Methods of Galvannealed Steel Sheet
Authors: Zhang Yan Wen , Wang Ji Hui , Chen Yu
Published: May 2011

Powdering and desquamation is prone to happen when galvannealed sheet steel is stampinged and Powdering or desquamation often happens at the fragile phase where Fe content is high. The fragile phase thickness of the coating of galvannealed steel sheet is correlative nearly to the coating anti-pulverization ability.So it is very important to measure the fragile phase thickness with the research of galvannealed sheet steel process. The fragile phase thickness of the same batch galvannealed sheet steel made by some steel plant is about 560~590nm when it is measured by glow ischarge spectrometer , fracture observation methods by SEM and metallographic microscope, the error is very little.
Indentation Responses of Functionally-Graded Al2TiO5- Based Ceramics
Authors: Oo Z , Low I.M
Published: May 2011

Aluminium titanate, Al2TiO5 (AT) with the pseudobrookite structure is the only compound in the alumina-titania system. It is an excellent refractory and thermal shock resistant material due to its relatively low thermal expansion coefficient (1 ´10-6 °C –1) and high melting point (1860°C). However, its low mechanical strength, hardness and fracture resistance together with susceptibility to decomposition in the temperature range 900–1200°C has limited its wider application. In this paper, the innovative tailored design of functionally- graded Al2TiO5 – based ceramics system was presented. This involves the use of a vacuum heat-treatment or die-pressing to form hard graded layers of alumina on Al2TiO5. These hard outer layers will provide hardness and wear resistance to protect the softer but damage resistant underlayers. The results will also explore unresolved issues concerning the effect of graded interfaces on their physical and mechanical performance properties.
Synthesis and Characterization of Alkyd Resin Based on Soybean Oil Polyols
Authors: Zheng Xiao Qing , Yang Li Ting , Wang Kun Peng
Published: May 2011

Soybean oil-based alkyd resin was prepared using soy-based polyol, maleic anhydride and phthalic anhydride. The soy-based polyol was obtained through the epoxidization of soybean oil, followed by ring-opening with methanol and, the hydroxyl values of soybean oil-based polyols used in this reaction is 169.93 mgKOH/g. In the reactions of soy-based polyol, maleic anhydride and phthalic anhydride, the molar ratio of hydroxyl value is equal to carboxyl value and the molar ratio of maleic anhydride to phthalic anhydride is 2:1, 1:1 and 1:2, respectively. 1% hydroquinone based on total reactants was used as inhibitor of polymerization, 1% dibutyltin oxide was used as catalyst.
Preparation, Characterization and Application in Electromagnetic Wave Absorption of Core-Shell C/Fe3O4 Nanocomposites
Authors: Liu Qiang Chun , Dai Jian Ming , Zi Zhen Fa , Wu Da Jun , Sun Yu Ping
Published: May 2011

Large-quantity core-shell carbon spheres/Fe3O4 nanocomposites were synthesized via a simple solution method. The phase structures and morphologies of the composite had been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the carbon spheres were covered by a layer of Fe3O4 nanoparticles with a diameter of about 25 nm. Measurements of the electromagnetic parameters of the samples showed that microwave absorption properties of the carbon sphere-Fe3O4 nanocomposites were much better than that of the pure Fe3O4 or the mixtures of carbon spheres and Fe3O4 microspheres. The optimal reflection loss (RL) reached −37.8 dB at 14.8 GHz for a layer thickness of 2.0 mm, which is favorable for application of our samples in a wide frequency range.
Dyeing of Silk/PLA Mixture with Reactive Dyes
Authors: Liu Kai Qiang , Rui Yan Lian , Chen Guo Qiang
Published: May 2011

Silk/PLA mixture is a new textile material, and it combines the outstanding characteristics of silk and PLA fibers. During the wet process, this mixture is subjected to some problems owing to the poor resistance of PLA fiber to alkali. The silk component in this mixture can be dyed with acid dyes under acidic condition, and with reactive dyes under alkaline condition. In the present work, silk/PLA mixture was dyed with Everzol ED reactive dyes in the case of the use of sodium carbonate and sodium bicarbonate as alkalis for the fixation of dyes. The alkali dosage and dyeing temperature on the uptake of dyes by this mixture were discussed. Also, the dyeing rates, building-up properties and color fastness of reactive dyes were determined. It was found that Everzol ED reactive dyes exhibited good dyeing properties for silk/PLA mixture under weakly alkaline condition in the presence of sodium bicarbonate.
Influence of PEG20000 on Ultrafine ZnO Flowers
Authors: Shen Xiao Yi , Sun Yi , Liang Yuan , Zhai Yu Chun , Ning Zhi Qiang
Published: May 2011

With zinc acetate and sodium hydroxide used as raw materials, while polyethylene glycol employed as dispersant agent, ultrafine zinc oxide flowers were successfully synthesized by hydrothermal method. The influence of the concentration of PEG20000 on the morphologies of ZnO flowers was discussed. The as-synthesized ZnO flowers consisted of microrods with hexagonal morphologies. The crystal structure and ultraviolet absorbing performance of ZnO flowers were also characterized using XRD, UV-VIS absorption spectrum. The results indicate that ZnO flowers are hexagonal wurtzite structure with high purity. There is a strong excition absorption peak at 300 nm in UV-VIS absorption spectrum and blue shift existed obviously.
Comparative Study of Pretreatment and Maturing Methods on the Preparation of Cellulose/Magnetic Nanocomposites
Authors: Tang Ai Min , Song Jian Kang
Published: May 2011

Cellulose/magnetic nanocomposites were prepared by an ultrasound-assisted in-situ composition using cellulose fibers as matrices. The effects of pretreatment and maturing method on the composite efficiency were comparatively studied. Firstly the effects of ultrasound wave and mercerization pretreatment on the composite efficiency were investigated. Then the influences of ultrasound-assisted maturing on the composite efficiency were also discussed. Finally the nanocomposites’ structures were investigated by means of SEM, AFM and X-ray diffraction and the magnetic properties of the nanocomposites were determined by superconducting quantum interference device (SQUID). Results showed that ultrasound wave pretreatment was more efficient for the in-situ composition compared to the mercerization pretreatment. The amount of magnetic particles (valued as mass fraction of Fe) for untreated, ultrasound wave treated and mercerization treated cellulose fibers were 6.70%, 7.67% and 3.14%, respectively. The mass fraction of Fe increased from 5.04% for the mechanical agitation-maturing prepared sample to 5.61% for the ultrasound-assisted maturing prepared sample. Both ultrasound pretreatment and ultrasound-assisted maturing can remarkably raise the composite efficiency and magnetic particles’ yields. This reveals that ultrasound wave assisted-maturing is an effective method to control both the size and the distribution of magnetic iron oxide within the composites. Cellulose/magnetic nano-composite fibers with ferrite particles in size between 10 nm to 100 nm were obtained. XRD analysis indicates that the iron oxide synthesized is mainly in the C phase of g-Fe2O3. SQUID results reveal that the ultrasound-assisted in-situ synthesized cellulose/magnetic nanocomposites are superparamagnetic.
Impact of Functional Layer for Thermal Stress of Concrete Pavement Structure
Authors: Yang Bin , Chen Chuan Tong , Yuan Ding Ming
Published: May 2011

Flexible functional layer of asphalt sands setting between concrete pavement slab and base can change the contact state of different layers and reduce the friction coefficient between slab and base and the thermal stress of pavement slab can be decreased. This functional layer can also protect the base from void disease produced by infiltration and erosion of rain water and snow water. This paper mainly focuses on the impact of parameters variation of contact state of pavement structural layer, slab length and flexible asphalt functional layer thickness and modulus for concrete pavement thermal stress to provide some basis for the selection of flexible functional layer of concrete pavement structure. Calculation results show that interlayer friction coefficient has relatively obvious effect on thermal stress of pavement structure; setting a functional layer can reduce the slab thermal stress evidently. Slab thermal stress and base thermal stress increase non-linear with the growth of slab length. The thickness variation of the functional layer has a slight impact on the concrete slab thermal stress. The higher the modulus of the functional layer is, the greater the slab thermal stress is.
Experimental Study of the Corrosion Behaviors on the Rod and Tube Material in Oil Pumping Wells
Authors: Wang You Qiang
Published: May 2011

To study the corrosion behaviors on the rod and tube materials used in oil well is very important for prolonging oil well repairing periods, lowering oil production maintenance costs and increasing oil production efficiency. Through selecting some kinds of tube and rod materials which are always used in oilfield, chemical corrosion experiment and electrochemical corrosion experiment were carried out under different conditions. The results show that the corrosion rates are accelerated with material prestress increasing, liquid mineralization rate and temperature rising. The nitrified materials have better corrosive resistance than untreated materials. The electrochemical corrosion experiment results show that the electrode potentials of four materials (45, 20CrMo, J55, N80) have tiny difference and don’t exceed 20mV. The bimetallic corrosion tests show that the couple corrosion of the four selected materials pair can be ignored under short period and oxygen conditions.
Mechanical Properties of a Microcapsule-Containing Epoxy for Self-Healing Applications
Authors: Liu Xing , Lee Jong Keun
Published: May 2011

The addition of microencapsulated healing agent or catalyst in a polymer matrix can potentially change its mechanical properties and processing characteristics. The extent of this change depends on the volume fraction of the additives, the level of interfacial interaction, and the inherent properties of the additives. For a self-healing concept to be viable, the healing performance should be achieved without compromising the overall processing and mechanical properties of the polymer matrix. In this study, tensile and dynamic mechanical properties were investigated and discussed for an amine-cured epoxy dispersed with different loadings of microcapsules.
Research on Two Novel Functional Citral-Based Azobenzene Derivatives with Different Substituted Groups
Authors: Zhou Jing Xin , Jiao Ti Feng , Li Xu Hui , Liu Wen Zhu , Xing Yuan Yuan
Published: May 2011

Two functional citral-based azobenzene derivatives with different substituted groups have been synthesized and their photoisomerization have also been investigated. It has been found that depending on different substituted groups, the formed azobenzene derivatives showed different properties, indicating distinct regulation of molecular skeletons. UV and IR data confirmed commonly the characteristic absorption of citral chain and aromatic segments in molecular structures. The photoisomerization of these compounds both in solution and in cast film were investigated and showed changes depending on different substituted groups. The present results have demonstrated that the special properties of azobenzene derivatives can be effectively turned by modifying molecular structures of objective compounds with proper substituted groups, which show potential application in functional material field.
Improvement in Ovality of Pipeline Steel X80 with Weld Power under Multi-Wire SAW Welding Process
Authors: Li Yi Bo , Huang Ming Hui , Lu Xin Jiang
Published: May 2011

Pipeline steel X80 is a kind of advanced high grade steel and commonly used in long-distance transportation of oil and gas. Ovality of the pipe plays key role in improving its crushing strength. In this paper, a simulation method is proposed to improve the performance of ovality of X80 Pipeline Steel. First, a 3D thermo-mechanical coupled finite element model of the multi-wire SAW welding processes is built using MSC.MARC, upon which parameters of double ellipsoid heat source model is determined. Then, the relationship between weld power and ovality is studied under difference process inputs and a satisfactory weld power is found to decrease the ovality of the pipeline steel. Finally, validation and prediction of deformation and ovality of the pipeline is carried out via plate welding experiments.
Thermo-Physical Properties of SiCAl Composites with High Volume Fraction of Reinforcement Prepared by Combining Powder Injection Molding and Pressure Infiltration
Authors: He Hao , Li Yi Min
Published: May 2011

SiC/Al composites with high reinforcement content were fabricated by pressure infiltration of aluminum alloy into porous SiC preform obtained by powder injection molding using a bimodal powder mixture. The influence of powder loading and particle size on the thermo-physical properties of the prepared composites was investigated. The results indicate that the thermal conductivities (TC) increases and coefficients of thermal expansion (CTE) decreases with increasing powder loading and particle size of the coarse powders in the bimodal powder system. The TCs are below the estimated value based on Hasselman-Johnson model, mainly due to the residual pores and the irregular particle shape. The CTEs of the composites increase with increasing temperature from 100°C to 400°C, and the increasing rates vary at different temperature ranges. Deep cooling in liquid nitrogen is effective to bring dislocations in the matrix and thus reduces the CTEs.
Preparation and Characterization of Magnetic Strong-Base Anion Exchange Resin
Authors: Shuang Chen Dong , Yang Feng , Zhou Yang , Li Peng Hui , Li Ai Min
Published: May 2011

The magnetic copolymer was prepared by polymerization of glycidyl methacrylate (GMA) and divinylbenzene (DVB) in the presence of OA-modified magnetic nano-particles. The magnetic strong-base anion exchange resin (MAER) was formed by quaternization of magnetic copolymer. Transmission electron microscope (TEM) and scanning electron microscope (SEM) were used for observation of prepared magnetic nano-particle and MAER, respectively. FT-IR spectrometer was used to characterize the magnetic nano-particle and MAER. To explore the potential application of MAER for natural organic matter (NOM) removal, completely-mixed (CMC) mode was used for humic acid (HA) adsorption. It was found that the HA removal for CMC mode with MAER resin was 10~20% higher than conventional process before breakthrough.
Photocatalytic Activities of Ce3+-Doped TiO2 Thin Films Prepared by Sol-Gel Method
Authors: Zheng Shu Kai
Published: May 2011

A series of TiO2 thin films with and without Ce3+ doping were successfully obtained on microscope glass slides by sol-gel method. The photocatalytic activities of the pure TiO2 and Ce3+-doped TiO2 thin films were evaluated by the degradation of rhodamine B solution. The effects of both Ce3+ contents and annealing temperatures on the photocatalytic activities of the samples were examined. The results indicated that the TiO2 thin film with an atomic ratio of Ti:Ce=5:1 annealed at 300°C had a higher photocatalytic activity among the samples.
Study on Synthesis of Superabsorbent Using Microwave Heating and Water Absorbency
Authors: Ren Hao , Zhang Yu Fen , Huang Tai Zhong , Wang Juan
Published: May 2011

The aqueous solution polymerization methods were carried out using microwave heating for the superabsorbent synthesis experiment. The differences between reaction temperatures and reaction times were compared respectively under the same conventional heating conditions. The results showed that microwave heating can generate better results: The maximum of distilled water absorbency is 711 times, and the maximum of 0.9% saline water absorbency is 86 times when the polymerization temperature is at 35 °C and the reaction time is 1.5 h. Water absorbency of the superabsorbent obtained using microwave heating is better than that of conventional heating. Analysis of FTIR and SEM showed that starch grafting with acrylic acid and acrylamide was successful, and a three-dimensional network structure was formed in superabsorbent. The causes of organic reactions accelerated using microwave heating were also discussed in this paper.
The Effective Thermal Conductivity of Composite Materials with Spherical Dispersed Phase
Authors: Wan Bin , Yue Kai , Zheng Lian Cun , Zhang Xin Xin
Published: May 2011

The derivation of effective thermal conductivity (ETC) for composite materials is a long-standing thermal transport problem. Based on the thermal resistance model and integration method, two analytical solutions of the ETC of composite materials, in which the dispersed phase consists of spheres in cubic arrangements, were derived either neglecting or considering the effect of radiation. As the effect of radiation in porous composite materials is considered, the theoretical result indicates that the effect of radiation cannot be neglected as the temperature or porosity of composite materials is high. The differences between the theoretical results and experimental data of the ETC of porous composite materials are acceptable.
Development of Pass Schedule Calculation Procedure for Single-Stand Reversing Cold Rolling Mill
Authors: Bai Jin Lan , Wang Jun Sheng
Published: May 2011

In this paper, pass schedule calculation method for single-stand reversing cold rolling mill is introduced. Newton－Rapshon method is used to solve non-linear equations composed of each pass loads according to equal power rolling strategy. After the thickness of each pass is calculated, rolling parameters of each pass is obtained by modification. Based on the method pass schedule calculation procedure is developed. The practical application shows that calculation result of program is close to the actual data, and the speed and stability of the procedure can meet the requirement of on-line process control, so it is suitable for the single-stand reversible cold rolling mill.
Corrosion Inhibition of 304L Stainless Steel by Dicyclohexyl Thiourea in HCl Solution
Authors: Shen Chang Bin
Published: May 2011

At four different temperatures, by potentiodynamic polarization curve, the inhibiting effect of dicyclohexyl thiourea (DCTU) on the corrosion behavior of 304L stainless steel in 2 M hydrochloric acid solution was investigated. The result indicated that DCTU acted as an efficient anodic inhibitor for the corrosion of 304L SS. Excellent inhibition efficiency was evident in the acidic solution and found to vary with temperature and concentration of the inhibitor. The adsorption of this compound on the 304L SS surface was found to obey Temkeins adsorption isotherm and the inhibition was governed by chemisorption mechanism. The deduced thermodynamic parameters of adsorption revealed a strong interaction and spontaneous adsorption of DCTU on the metal surface.
Synthesis and Characterization of a New Thermosetting Boric Acid Ester
Authors: Zhang Jian , Liu Jia
Published: May 2011

A new thermosetting boric acid ester modifier containing unsaturated bonds (abbreviated TBCE) was prepared. Structure, hydrolytic stability, curing properties and and thermal properties of the boric acid ester were studied by FT-IR, DSC and TGA. The result indicated that the obtained boric acid ester was soluble in most common solvents and was easily processed. The thermogravimetric analysis of silicon-containing arylacetylene resin modified by TBSE (abbreviated MSAR) showed that char yield at 800°C was 87% under nitrogen and 49% under air, and Td5 (temperature of 5% weight loss) were 570°C and 580°C respectively.
The Analysis and Improvement on Shrunken Cause of Dome Roof Oil Tank in Winter
Authors: Qi Lin , Zhao Hong
Published: May 2011

The causes that lead to the shrunken cause of dome roof oil tank were analyzed and some practical measures were offered for the prevention of this kind of shrunken, which is valuable about ensuring security of oil tank and protection of external pressure caused destruction in oil tank. With the rapid development of China's oil economy, increased dramatically the demand for large-scale storage and transportation equipment. In the refining and chemical production equipment, the vertical cylindrical steel dome tank is a widely used storage device, it is low cost, easy to operate. Mainly used for storing crude oil, diesel and some chemical products. Tank design pressure is lower, the tank wall, tank top, tank bottom are thinner, and it is easy depression because of large negative pressure inside the tank in the course. Therefore, the correct understanding of the reasons of depression and mastering tank preventive measures, security maintenance for the storage of equipment is very important. In this paper, a refinery in Harbin City, take the dome tank as an example of crude oil and analysis cause of their depression.
Photochemical Synthesis of SnO2 and its Photocatalytic Activity for Hydrogen Production
Authors: Xue Wei Wei , Wang Bin Bin , Wang Xu Xu
Published: May 2011

Here we reported SnO2 can be synthesized by irradiation of SnCl4 solution with Hg lamp in N2 atmosphere. The preparation mechanism was proposed. The as-prepared sample showed higher photocatalytic activity than TiO2 (Degussa P25) and the commercial SnO2 for hydrogen production from ethanol aqueous solution.
Study on the Preparation and Properties of the PVA/SiO2 Hybrid Coating on BOPP Film via Sol-Gel Process
Authors: Zhu Li Jing , Wang Jia Jun , Guo Li , Shen Jie
Published: May 2011

In order to improve the barrier property of the biaxially oriented polypropylene (BOPP) film, the PVA/SiO2 organic-inorganic hybrid coating on BOPP film was prepared by the sol–gel method. And the structure and properties of the hybrid composite films were characterized. The results showed that, the oxygen barrier property of the composite films was enhanced with the increase of PVA content, while the water vapor barrier property of the composite films was dropped. As the mass ratio of PVA increased to 80%, the oxygen barrier property of the composite films was 308 times that of the pure BOPP film, however, water vapor barrier character was half of the BOPP film.
Manufacturing Technique of Sound-Absorbent PET/TPU Composites
Authors: Lin Jia Horng , Lin Chia Chang , Huang Chao Chiung , Lin Ching Wen , Su Kuan Hsun , Lou Ching Wen
Published: May 2011

Five testing matrixes were prepared to test with sound absorption, tensile strength, and thermal conductivity respectively. The low-melting-point (low-Tm) polyester (PET) fibers were blended with weight ratios (10 wt%, 20 wt%, 30 wt%, 40 wt% and 50 wt %) with PET staples, forming the PET nonwoven fabrics. The thermoplastic polyurethane (TPU) was thermal bounded with the nonwoven fabrics with different lamination number to examine the sound absorption rate, creating the PET/ TPU composites. Afterward, four sets of samples – PET nonwoven fabrics and PET/ TPU composites with TPU films laminated on the front, in the middle, and on the rear of the composites, were compared. PET/ TPU composite with TPU film laminated in the middle exhibited the optimum sound absorption; moreover, 30 wt% was proved to be the optimum parameter of the low-Tm PET fibers for the PET/ TPU composites.
Telecommunication Evaluation of Conductive Composite Plates
Authors: Lin Jia Horng , Lin Ching Wen , Hsieh Chien Teng , Chen Chi Yu , Lu Po Ching , Lou Ching Wen
Published: May 2011

Two identical zigzag-shapes and an aluminum zigzag shape foil were combined as a slice testing piece. Each of the pieces was connected with AC. 110 V and AC. 12 V. The result indicated that the piece, whose tooth was 10mm wide with intervals of 15 mm, displayed an electromagnetic shielding effectiveness (EMSE) of 30 mG with the load current of AC. 110 V. The EMSE of another piece, whose teeth wide was 5 mm with intervals of 10 mm, was 20 mG in the load current of AC. 12 V. This result proved that samples were with EMSE under the alternating current.
High-Gravity Assisting Combustion Synthesis to Prepare High-Strength Al2O3/ZrO2 (Y2O3) Eutectics
Authors: Liu Liang Xiang , Zhao Zhong Min , Zhang Long , Huang Xue Gang , Ma Tao
Published: May 2011

By adding ZrO2 and Y2O3 powder blend into the thermit, large bulk Al2O3/ZrO2 (Y2O3) eutectics were prepared by combustion synthesis under high gravity, and the influences of high gravity on microstructures, crystal growth and properties of the materials were also discussed. The XRD patterns showed that the introduction of high gravity field did not change phase constitution of the ceramics, and the ceramic matrix was mainly composed of α-Al2O3, t-ZrO2 and m-ZrO2. SEM images and EDS analyses showed that with increasing high gravity level, the morphologies of the ceramic microstructures transformed from the cellular eutectics to the rod-shaped colonies, and volume fraction and aspect ratio of the rod-shaped colonies increased while the rod-shaped colonies were refined; as the high-gravity field was larger than 200g, the microstructures of composite ceramics developed as the randomly-orientated rod-shaped colonies with a symmetrical triangular dispersion of tetragonal ZrO2 fibers of 300nm in the average diameter. Relative density, hardness, flexural strength and fracture toughness simultaneously reached the highest values of 98.6%, 18.6GPa, 1248MPa and 15.6MPa·m1/2 as the maximum high-gravity level of 250g was achieved. The increases of relative density and hardness of the ceramics with the high-gravity level are attributed to the acceleration of gas-escape from ceramic melts and the elimination of shrinkage cavity in the ceramics. The increase in fracture toughness results from the enhancement of the coupled toughening mechanisms while the increase in flexural strength comes from the refinement of the microstructures, the decrease of critical defect size and the achievement of high fracture toughness.
Micropatterning of Schiff Bases Polymer Langmuir-Blodgett (LB) Films
Authors: Li Tie Sheng , Xu Wen Jian , Jia Hui Ying , Wu Yang Jie , Miyashita Tokuji
Published: May 2011

A series of novel copolymers poly (AOBDA-co-DNMMA)s containing 2-Allyloxy-N-benzyl- idene dodecylamine (AOBDA) and 1.4-dioxaspiro[4.4] nonane-2-methyl methacrylate (DNMMA) were synthesized. The copolymers could form stable condensed monolayer at air/water interface and be transformed onto solid substrates successively. Positive-tone patterns with the resolution of 0.75 μm of the copolymers Langmuir-Blodgett (LB) films with 40 layers were obtained by deep UV irradiation, followed by developing in acetone. The etched gold patterns with resolution of 0.75 μm were also obtained, showing that the copolymer has enough resistance to wet etching suitable for fabricating photomask. The mechanism of photolysis was also investigated by UV, IR and GPC.
Orthogonal Test of Flexural Toughness for Hybrid Fiber Reinforced Concretes
Authors: Liu Xiao Fan , Mei Guo Dong , Li Ji Xiang , Lun Yun Xia
Published: May 2011

Orthogonal tests are designed for hybrid fiber reinforced concrete. Bending toughness of hybrid fiber reinforced concrete, with the substrate intensity C30, the quantity of the volume for the steel fiber dosage 0~1.5% and polypropylene fiber dosage 0~0.3%, are studied. The results show that the hybrid fibers significantly improve the toughness of the concrete matrix. When the dosage reaches to a certain number, the affection of fiber toughness is decreased. Based on the test results the best dosage of hybrid fibers which is the steel fiber 1% mixed with 0.1% polypropylene fiber is recommended.
Study on Preparation and Corrosion Inhibition by the Distiller's Grains Extract
Authors: Lai Chuan , Xie Bin , Yi Bin , Xiang Zhen , Yang Xue , Zeng Ni , Zou Li Ke , Lu Zhong Ming
Published: May 2011

The environment-friendly hydrochloric acid pickling inhibitor was extracted from distiller's grains (DG). By comparing a variety of extraction methods of DG, the effect of different extraction method on inhibition efficiency of extraction was investigated, and the inhibition efficiency for Q235 steel in hydrochloric acid medium was studied by weight loss measurements, electrochemical measurements and SEM. The results show that the distiller's grains extract (DGE) acts as an excellent acid pickling corrosion inhibitor for the corrosion of Q235 steel in hydrochloric acid. The studies of inhibitor preparation methods show that the ultrasonic technology is the best method. The effective constituent of DGE is a mixed-type inhibitor in hydrochloric acid medium.
The Coarsening of Dendrite Arm Spacing during Solidification of Al-Cu-Mn Alloy
Authors: He Zhi
Published: May 2011

A secondary dendrite arm spacing coarsening model for multi-component alloy is proposed, where the back diffusion flux in solid is simplified by introducing the parameter of solute boundary layer,δi . The simplified model was applied to the predication of the secondary arm spacing of directional solidified Al-Cu-Mn alloy. The good agreement between the experimental results and the calculated lines shows that this simplified model is satisfactory for the prediction of dendrite arm coarsening during solidification in multi-component alloys.
Visco-Elastic Study on Filled Polymer Composites
Authors: Yin Shui Ping , Yu Min
Published: May 2011

Dynamic mechanical behavior of materials, which is the response under cyclic stress(cyclic strain/force) in vibration condition, is different from its static behavior. The latter is the behavior of material in a monotonic increasing stress(strain/force). Dynamic mechanics analysis (DMA) is a method to measure the dynamic stiffness and damping in a lower stress level(linear elastic and lower than its yield strength). In the paper, dynamic mechanical experiments of filled polymer materials, polysulfone(PSU) and polyurethane(PUR), were performed on EPLEXOR 500N which manufacturing by GABO of Germany, the relationship of storage modulus E', loss modulus E" and loss tangent to pre-static load and frequency were systemically analyzed.
Preparation and Performance of Co3O4/Polyaniline Nano-Composite for Supercapacitor
Authors: Yu Shu Ping , Chang Xiao Cong , Wang Zhong Ming , Han Ke Fei , Zhu Hong
Published: May 2011

Cobalt oxide-Polyaniline (Co3O4/PANI) nanocomposites were prepared via inverted emulsion polymerization. The structure of the obtained composites were characterized by X-ray diffraction (XRD). The electrochemical behavior was studied by cyclic voltammetry(CV) and electrochemical impedance spectrometry(EIS) experiments. The Co3O4/PANI(1:2) composite calcined at 400°C exhibits the highest capacitance value of 357 F/g at the scan rate of 5mV/s.
Characteristics and Mechanism for Host–Guest Recognition of Isopropanol Vapor Based on Calixarene Supramolecules
Authors: Zou Rui Fen , Cao Zhong , Zeng Ju Lan , Dai Yun Lin , Sun Li Xian
Published: May 2011

The adsorption characteristics of four calixarene supramolecular compounds, like RCT, PCT, MRCT, and TBCA, as coating materials of quartz crystal microbalance sensors responding to isopropanol vapor have been investigated in this paper. The results showed that the RCT was the best coating material for isopropanol vapor when the coating mass reached 20.41 μg. The frequency shift of RCT coated QCM and the concentration of isopropanol vapor had a good linear relationship and sensitivity. Comparing with the gas chromatography, the QCM sensor could be well used for the determination of isopropanol vapor with a recovery rate of 95.22~108.1 %, and the two methods showed a well consistent examination result. Also, the sensor possessed good reversibility, reproducibility and stability, indicating that the RCT coated QCM sensor can be applied for the detection of the atmospheric polutant of isopropanol vapor in practice. The mechanism of the calixarene derivative for recognition of the isopropanol molecule has been preliminarily discussed.
Technical Research of Alloy Bar’s Rolling with Cooling
Authors: Wei Li Qun , Guo Yan Hui
Published: May 2011

The rolling force model and energy calculation equation for 20CrMnTi steel are constructed based on practically measured data and theoretical math model. In the practical production, the heating temperature of 20CrMnTi steel is lowered from 1150°C to 1050°C, and in consequence, the total energy consumption is reduced by 5.81%. Moreover, the mill and motor abilities are still met and the rolled goods’ properties and surface quality are still guaranteed. Thus, energy saving is successfully realized.
Microstructures and Interfacial Reaction of CrON Diffusion Barrier in the NiCrAlY-CrON Duplex Coating System during Thermal Treatment
Authors: Li Wei Zhou , Li Yue Qiao , Yi Dan Qing , Liu Hui Qun
Published: May 2011

To decrease the interdiffusion, CrON interlayer as a diffusion barrier was introduced into the interface of NiCrAlY overlayer and DSM11 substrate. The microstructure and effect of the diffusion barrier were investigated. It was found that the as-deposited CrON diffusion barrier was comprised of Cr2O3 and CrN. During thermal treatment (including vacuum heat treatment and thermal exposure), the diffusion barrier was first transformed to Al2O3 and Cr2N, then to Al2O3 dominant interlayer, and porous mixed-oxides including TiO2 and NiCr2O4 spinels were detected in the interdiffusion zone between the diffusion barrier and the substrate. The presence of α- Al2O3 in the diffusion barrier was the main reason for suppressing the interdiffusion. The interfacial reaction mechanism in the diffusion barrier was discussed by elemental diffusion and chemical reaction thermodynamics.
The Research on the Effect of Drilling Fluids Additives on Rate of Penetration(ROP)
Authors: Zhao Xiong Hu , Gao Fei , Li Yu Fei , Li Wai
Published: May 2011

The paper attempts to investigate the interaction between sandstones and some drilling fluids components, including inorganic salts and surfacant ZJBS, as well as the influence on ROP imposed by them. The mechanism of the experiment is initially achieved. The results show that Al3+ and ZJBS both can improve the ROP. The ROP will be enhanced by 33.7% when AlCl3 concentration is up to 0.01mol/L, and Al3+ enables zeta potential of the solution containing cuttings shifted from negative value to zero , and finally to positive value by means of analyzing zeta potential, which contributes to the significant improvement of ROP when zeta potential is greater than -10mV. Higher surface free energy created by the close-to-zero zeta potential is conducive to crushing rocks, which in turn increases the ROP and meanwhile reduces drilling costs. The ZJBS also can change the zeta potential of the cuttings and it has good compatiblity with sandstone. When its concentration is up to 0.01mol/L, the permeability rate of ZJBS is 15 times than that of distilled water. The ZJBS can effectively improve the efficiency of interaction between drilling fluids and this will be helpful to enhance the ROP.