bluuebunny/crossref_metadata_2025 huggingface dataset:
Heat Transfer Characteristics of an Array of Impinging Gaseous Slot Jets
Authors: Liu Zu Ling , Wu Cheng Bo , Wang Xian Jun , Zhang Zheng Rong
Published: December 2011

A comprehensive experiment was conducted for heat transfer characteristics for an array of impinging gaseous slot jets to a flat plate with strong turbulence (nozzle exit Reynolds number Re=22500~64700).Find that turbulence intensity of flow has an important influence on local forced convective heat transfer coefficient. Meanwhile, the nozzle-to-plate spacing and nozzle exit Reynolds number Re would affect the mean forced convective heat transfer coefficient of the slot jets. And heat transfer efficiency of slot jets has been set to show the relation between ability of the jets and energy consumption of gas supply.
The I.C. Engine Test-Bed Laboratory Control System Designing
Authors: Peng Sheng Hui , Wang Zi Hong , Chen An Yu , Wang Yuan
Published: December 2011

This paper discusses the designing of I.C. engine test-bed laboratory’s general layout and its control system，puts forward the model of the I.C. Engine Test-Bed control system based on CAN-BUS. The system adopts the centralized management and decentralized control. Each I.C. engine test-bed is controlled by the master computer on the foundation of independent control. The system also adopts the standardization module design, easy to expand and to be used widely.
Research on Crew Examination System Based on Web
Authors: Gao Guo Dong , Zhang Wen Xiao , Yu Gong Zhi , Sui Jiang Hua
Published: December 2011

With the rapid development of computer technology and Internet, all kinds of distant educations based on Internet have been coming out constantly. To reduce the cost of exam and alleviate the burden of teachers, the crew examination system was designed and implemented. This system is an online examination system which integrates computer network technology, database technology and ASP technology. The B/S model was adopted in this system and using ASP visit ODBC accesses database. This system includes two functions: examination system and management system. Test library management, random questions, online testing, automatic scoring, scores query and other functions were achieved. Crew examination system realizes the change from traditional test’s way to the way based on Internet.
Technique for Producing High Effective, Fast Modification and High Sr Content Al-Sr20 Master Alloy and its Application
Authors: Chen Jian Chun , Liao Cheng Wei , Pan Chun Xu
Published: December 2011

This paper introduces a novel “direct reaction - hot extrusion” technique for producing high effective, fast modification and high Sr content Al-Sr20 master alloy. It mainly contains four processes: 1) Alloying by a medium-frequency induction furnace with complementary mechanical and electromagnetic stirring; 2) Degassing and deslagging by a rotary degassing method; 3) Casting coarse alloy bars; 4) Producing Al-20Sr master alloy wire by using a hot-extrusion process of large cross-section deformation. Microstructural characterizations revealed that the intermetallic Al4Sr phase in the Al-Sr20 alloy was homogeneously distributed in Al matrix with small size and roundish shapes, which ensured the master alloy wire exhibit advantages including high recovery, good reproducibility, no delitescence of modification, no corrosion on equipments, and good workability with smooth surface, no bubbles, no peeling and no cracking. This Al-Sr20 master alloy has been industrially applied in Al-Si alloys casting in automobiles and motorcycle wheels, etc.
Theoretical Study of the 1CHBr + 3O2 Reaction
Authors: Shi Cong Yun , Zhan Zhi Gang , Liu Xing Zhong , Ke Chang Mei , Lv Zao Sheng
Published: December 2011

The mechanism of the reaction of the monobromocarbene (1CHBr) with 3O2 was studied theoretically at the B3LYP/6-311++G(d,p) level on the singlet potential energy surface (PES). All structures of the stationary points (reactants, intermediates, transition states and products) were optimized and their energies were obtained. Three product channels, P1 (HCO + BrO), P2 (CO2 + HBr) and P3 (CO + HOBr), are found. P2 (CO2 + HBr) is the most favorable one both kinetically and thermodynamically.
Dynamic of Extracting Flavonoids from Honeysuckle Leaves
Authors: Wu Sheng Fu , Ma Shao Mei , Huang Zeng Wei , Liao An Ping , Yuan Ai Qun
Published: December 2011

Both water decoction method and ultrasonic-assisted method were used to compare the extraction efficiency during the extraction of flavonoids from honeysuckle leaves. Three dynamic models were adopted in study of the extraction dynamics. The results show that the ultrasonic wave strengthening can improve the extraction efficiency of flavonoids comparing water decoction method in the experimental conditions. The ultrasonic wave strengthening extraction dynamic equation agrees with , while the water decoction method extraction dynamic equation agrees with .
Kinetics and Thermodynamics Study of Thiosulfate Removal from Water by Calcined MgAl-CO3 Layered Double Hydroxides
Authors: Geng Cui Yu , Yu Xiao , Chang Zheng , Lei Xiao Dong , Sun Xiao Ming , Luo Liang
Published: December 2011

Layered double hydroxides (LDHs) are potential scavengers for anionic contaminants due to their “memory effect”. Here we report the removal of thiosulfate anion from contaminated water by calcined MgAl–CO3 LDH (CLDH). The results indicate that CLDH exhibits a good performance in adsorption of thiosulfate.We studied the kinetics and thermodynamics of adsorption of thiosulfate from water. The equilibrium isotherm showed that the uptake of thiosulfate anion well agrees with the Langmuir equation, the positive value of △HӨ demonstrates the endothermic feature of the adsorption, the pseudo-second order kinetics model can be uItalic textsed to describe the uptake process and the value of Ea was calculated to be 75.898 kJ/mol. Our results suggest that the process of thiosulfate uptaking was controlled by the reaction rate of thiosulfate with the CLDH rather than diffusion.
Preparation, Spectral Characterization and Crystal Structure 2-Acetyl-2'-Chloroacetanilide
Authors: Tai Xi Shi
Published: December 2011

2-Acetyl-2'-chloroacetanilide has been prepared using 2-chloroaniline and ethyl acetoacetate as starting material in toluene solution. The compound was characterized by mass spectrum, infrared spectrum, 1HNMR, 13CNMR spectra and X-ray single crystal diffraction analysis. The results show that the C=O bond lengths are 1.206(3) Å and 1.195(3) Å, which implies that the molecule is in the keto form. The complex forms layered structure through ••• stacking interaction.
Experiment on Nano-Modified Urushiol Titanium Anti-Corrosion Coating of the Top Heat Exchanger of Atmospheric Tower
Authors: Fan Yu Guang , Liu Guo Qing , Chen Bing , Zhou San Ping , Lin Hong Xian
Published: December 2011

Experiments were carried out on the heat resistance, corrosion-resistance and adhesion performance of the nano-modified urushiol titanium antiseptic paint on the top heat exchanger of Atmospheric Tower. Through the experiment, it can be found that the corrosion resistance in the environment of HCl-H2S-H2O can be effectively improved by adding a certain amount of nano-SiO2 into urushiol coating made of titanium the top heat exchanger of Atmospheric Tower for modification.
Synthesis of Methylal from Methanol and Trioxane over Acidic Resin
Authors: Zhang Jing , Chen Zhen , He Jun , Zhu Zhi Rong
Published: December 2011

The synthesis of methylal from methanol and trioxane was investigated by using acidic resin as a catalyst, and a variety of solvents were also tested such as toluene, 1,4-dioxane, N,N-dimethylformamide. Comparatively, the organic solvent was suitable for obtaining the better catalytic performance. Among the acidic resin tested, Amberlyst15 showed the highest conversion. Moreover, the reaction conditions were optimized over the modified β zeolite. As a result, the proper reaction conditions are 1,4-dioxane as solvent, reaction temperature 70°C, n(methanol):n(trioxane) =2.2:1, with catalyst 5 wt% and reaction time 3 h. Under the above condition, the yield of methylal may reach about 62 % with Amberlyst 15.
Nonlinear Bending of the Block Spherical Reticulated Shells
Authors: Han Ming Jun , Li You Tang , Qiu Ping , Wang Xin Zhi
Published: December 2011

the nonlinear bending problem of the shallow spherical shells with rectangular bottom was studied under the boundary condition of moved fixed-edges based on the nonlinear deformation foundational equations of shallow reticulated shells, the trigonometric series solution satisfies boundary condition of the deflection was derived first, the stress function was solved by substitution of the solution into the nonlinear compatibility equation, the nonlinear characteristic formula of the loads and the deflection was obtained by the energy equation, then the critical point was given. The critical load was given by the characteristic curves. The nonlinear characteristic formula in the paper can be reference by the engineering designers.
Preparation and Crystal Structure Er (III) Complex with 2-Formylbenzenesulfonic Sodium-3-Thiosemicarbazide
Authors: Tai Xi Shi
Published: December 2011

A novel ligand containing sulfonic has been synthesized using 2-formylbenzenesulfonic sodium and 3-thiosemicarbazide as starting materials, and a Er (III) complex was synthesized. The ligand was characterized by element analysis and IR spectrum. The crystal structure of the Er (III) complex was determined by X-ray single crystal diffraction. The results showed that the compound was triclinic, with P-1, a = 1.0596(4) nm, b = 1.3700(5) nm, c = 1.8305(7) nm, V = 2.4726(16) nm3, Z=2, M r= 1244.42, De =1.671 g/cm3, T = 273(2) K, F (000) = 1270, R = 0.0517 and wR = 0.1124. The complex forms two-dimensional layered structure through hydrogen bonds and π-π stacking.
Structure and Luminescence of Ba3MgSi2O8: Eu2+, Mn2+ Phosphors
Authors: Li Yue , He Da Wei , Wang Yong Sheng , Ming Fu , Wu Yang , Miao Feng
Published: December 2011

In this paper, Ba3MgSi2O8: Eu2+, Mn2+ phosphor was synthesized by the sol-gel method and high temperature solid-state reaction method. The structure and emission spectrum excited by near violet light were investigated. we studied the process of phase change in roasting and determined the approximate crystallization temperature of Ba3MgSi2O8: Eu2+, Mn2+ phosphors. Our results demonstrate that 514 nm emission bands were from Eu2+ ions replacing of the sites of Ba2+ in Ba2SiO4. 440 nm emission bands originated from Eu2+ ions substituting the sites of Ba2+ in Ba3MgSi2O8, corresponded to 4f65d1→4f7 transition of Eu2+ ions. 615 nm emission bands ascribed to Mn2+ ions taking place of the sites of Mg2+ ions, corresponded to 4T→6A red launch of Mn2+ ions.
A New Fluorescent Material of Zn (II) Complex with 1-Acetyl-2-Naphthol-4, 4’-Diaminodiphenylmethane
Authors: Wang Li Hua
Published: December 2011

A novel bi-Schiff-base Zn (II) complex, 1-acetyl-2-naphthol-4, 4’-diaminodiphenylmethane Zn (II), has been synthesized. The luminescent characterizations of the Zn (II) complex material have been studied in solid state and in organic solvents, and the effect of Mg (II) ion on the fluorescence of Zn (II) complex has also been investigated in organic solvents. The results show that the Zn (II) complex material emits weak green fluorescence at 536 nm in solid, emits strong blue fluorescence 451 nm in DMSO. However, there do have luminescent emissions in methanol and in ethanol duo to the influence of overtones.
Study the Effect of Junction Temperature on the Peak Wavelength in GaN-Based High-Power Green Light Emitting Diodes
Authors: Zhuang Rong Rong , Cai Ping , Huang Jiang Li
Published: December 2011

The junction temperature of GaN-based high-power green light emitting diodes is measured using the temperature coefficients of the diode forward voltage, from changes in temperature and changes in drive current to measure the LED junction temperature and the corresponding spectral, Respectively. Experiments show that, junction temperature due to environmental temperature increased, and the red shift of the spectral peak wavelength. When low temperature or less then the rated current range, the drive current increased in junction temperature rise due to the spectral peak wavelength blue shift . When the current is increased in the range of close to or greater than the rated current, leading to the junction temperature rise will cause spectral red shift . The peak wavelengths’ shift degree of 0.0579nm / k, 0.0751 nm / k and-0.1974nm / k, -0.0915 nm / k are calculated in both cases. The phenomenon is due to the LED junction temperature increases lead to band gap shrinkage, and the result of the role of spontaneous polarization and piezoelectric polarization in Ⅲ-nitride semiconductor materials.
Efficient Synthesis and Properties of a Photochromic Hybrid Diarylethene Bearing a Isoxazole Moiety
Authors: Liu Hong Liang , Pu Shou Zhi , Cui Shi Qiang , Li Hui
Published: December 2011

A novel photochromic hybrid diarylethene based on both isoxazole and cyano moieties was synthesized and its photochromic and fluorescent properties were also investigated. This compound exhibited good photochromism and functioned as a fluorescence switch upon alternating irradiation with UV and visible light both in solution and in PMMA film. Using this diarylethene 1c as optical storage was performed successfully.
The Effect of Hyperbranched Polymers on the Dyeing Properties of Polypropylene Fibers
Authors: Huang Xu , Zhang Wei Dong , Ma Shun Bin
Published: December 2011

3% hyperbranched polymer was incorporated into polypropylene and dyed with Disperse Blue 2BLN. The observed enhancement of dye uptake can be attributed to the introduction of polar groups. The finding that dye uptake on the modified fiber reached a maximum at 110°C suggests that “saturation” had occurred. While the washing fastness of dyed fabrics made from polypropylene fiber which had been modified with hyperbranched polymer was very good, the fastness of the dyeings to light was poor. The incorporation of 3% hyperbranched polymer into polypropylene prior to fiber spinning had no effect on the physical properties of the fiber，however markedly enhanced the dyeability of polypropylene.
The In Vitro Degradation Kinetics of Polyurethane Prodrug Materials
Authors: Li Chun Yan , Hu Cong Cong , Wen Zhi Guo , Dong Sheng Xiong
Published: December 2011

The method of high performance liquid chromatography (HPLC) is established to determine the content of antibacterial agent — ciprofloxacin (CF) in the degradation solution of ciprofloxacin-polyurethane (CFPU) and investigate the in vitro degradation kinetics by plotting and fitting the cumulative release curves to inspect the effects of different medium and different concentrations on drug release. The results showed that the HPLC method is accurate, reliable and simple. The drug-release of CFPU was bioresponsive and could be accorded with first order kinetics. It was observed that CF was released from CFPU by a combination of diffusion and erosion mechanism, mainly in the manner of diffusion in the absence of infection while erosion mechanism in the presence of infection.
Effects of Coal on the Structure and Properties of Coal/LDHs Composites
Authors: Zhou An Ning , Liu Bo , Xu Wei
Published: December 2011

Coal/ZnAl-Layered double hydroxides (ZnAl-LDHs) composites were synthesized via a co-precipitate method using Shenfu coal as a raw material. Effect of coal on the structure, morphology and thermal properties of coal/LDHs composites were investigated by XRD, FT-IR, SEM and DSC analysis methods. The results indicated that coal provided acidic functional groups as the interlayer anion of composites, and the mineral materials in coal made the structure of composites more complicated. The morphologies and particle sizes of composites were affected by the porosity and network characteristics of coal. Although exothermic behavior of coal weakened the endothermic efficiency of ZnAl-LDHs during the degradation process, the coal char on the surface of composites formed an insulation layer, which provided a synergistic fire retardant of ZnAl-LDHs in coal spontaneous combustion.
The Research on the Surface Topography of Diamond Crystals at High Pressure and High Temperature
Authors: Su Qing Cai , Zhang Jian Hua , Yin Long Wei , Li Mu Sen
Published: December 2011

The field emission scanning electron microscope is applied in this paper to analyze the surface topography of diamond crystal synthesized at high pressure and high temperature. The research shows that parallel steps, jagged steps, hexagonal hills exist on (111) plane of diamond. The topography has a relation to the growth way of diamond. The (111) planes of diamond crystal mainly grow in layer mode.
Α-Fe /Nd2Fe14B Nanocomposites for Electromagnetic-Wave-Absorber in GHz Microwave Frequencies
Authors: Lian Li Xian , Liu Ying , Deng Long Jiang
Published: December 2011

Nd5Fe92B3alloy was induction-melted. The α-Fe compounded low content of Nd2Fe14B nanocomposites were prepared using a melt-spinning method, subsequent annealing treatment, and ball milling. The complex permittivity, permeability of composites was measured in the 0.5-18 GHz frequency range. The permeability spectra exhibits relaxation type characteristic. The α-Fe/Nd2Fe14B composites shows an excellent microwave absorption property (reflection loss: RL<-20dB) in 9-17GHz with thin matching thickness 1.6-2.5 mm, due to the cooperate effect of magnetic loss and dielectric loss. α-Fe/Nd2Fe14B nanocomposites are thought to be a good microwave absorbers in GHz microwave range.
Synthesis, Photochromic Properties and Application in Optical Memory of a Diarylethene Based on Pyrrole Ring
Authors: Wang Ren Jie , Liu Gang , Cui Shi Qiang , Xia Hong Ying
Published: December 2011

A new unsymmetrical photochromic diarylethene compound, 1-[(2-methyl-5-(4-dioxolane-phenyl)-3-thienyl)]-2-(5-cyano-1,5-dimethyl-4-pyrryl)perfluorocyclopentene (1o), was synthesized and its photochemical, fluorescence properties were investigated in detail both in solution and PMMA amorphous film. The results showed that the compound exhibited remarkable photochromism, changing from colorless to violet after irradiation with 297 nm UV light. Finally, using this diarylethene as recording medium, polarization optical recording was carried out successfully.
Mechanisms for Enhancing Strip Flatness in Temper Mill and their Application
Authors: Ding Wen Hong
Published: December 2011

Abstract. In order to enhancing strip flatness in temper mill, in this paper, stress state, micro structure characteristics of contact surface, energy characteristics, dislocation intensity were analyzed. Plastic deformation characteristics of metal during tempering process have been come to a conclusion. Two mechanisms, friction mechanism and elongation rate mechanism, are proposed for enhancing strip flatness during tempering process. On the basis of these mechanisms, strip flatness control strategies suitable for tempering of ordinary cold rolled products, cold rolled deep-draw products, hot rolled products and hot rolled high strength steel products are discussed, and proper equipment configuration is proposed.
Synthesis and Optical Property of an Asymmetric Photochromic Diarylethene Derivative Bearing Benzofuran
Authors: Li Hui , Pu Shou Zhi , Cui Shi Qiang
Published: December 2011

A new asymmetric photochromic diarylethene bearing a benzofuran unit was synthesized, namely [1-(2-methyl-3-benzofuranyl)-2-(2-methoxyphenyl)]perﬂuorocyclopentene (1o). Its photochromic and fluorescent properties were investigated, respectively. The compound exhibited reversible photochromism, changing from colorless to red upon irradiation with UV light both in solution and in PMMA film. The diarylethene exhibited relatively strong fluorescence at 410 nm in hexane solution and 462 nm in PMMA amorphous film when excited at 300 and 385 nm, respectively. The fluorescence intensity decreased along with the photochromism both in hexane and PMMA film upon irradiation with 297 nm light.
The Surface Modification of Silica with Vinyltriethoxysilane
Authors: Zhang Ling , Chang Zhi Xian , Li De Liang
Published: December 2011

A review is provided of the research progress of silica modified with vinyltriethoxysilane (VTES-SiO2). The typical methods for preparing VTES-SiO2are introduced. The structure and stability of VTES layer and the controllability of various modified methods are elucidated. The characterization of VTES modified layer by means of Fourier transform infrared spectrometry, X-ray photoelectron spectroscopy, nuclear magnetic resonance, thermogravimetry, scanning electron microscopy and transmission electron microscopy are highlighted. Moreover, the application of VTES-SiO2 in the fields of rubber, glass, china, fiber, leather, paint, drug carrier, luminescent materials, catalyst technology, analytical chemistry and biochemistry were described in detail. The development trend on the preparation, determination of active groups and applications for VTES-SiO2were prospected, as well as the mechanism and the existing problems.
Synthesis and Photophysical Properties of Red-Emitting Iridium （Ⅲ） Complex Bearing Benzothiazole
Authors: Xiao Guo Yong , Li Xiao , Chi Hai Jun , Lu Yun Hua , Hu Zhi Zhi , Yu Jiang Long
Published: December 2011

New red phosphorescent material, (E)-2-(2-(thiophen-2-yl) vinyl)benzothiazole(2THSBT) iridium(III) acetylacetone(acac) complex [(2THSBT)2Ir(acac)] is synthesized from 2-methyl benzothiazole, thiophene-2-carbaldehyde and iridium trichloride anhydrate. The complex is characterized by MS and 1H-NMR. (2THSBT)2Ir(acac) gives a photoluminescence at 687nm, phosphorescent quantum yield: Φ(2THSBT)2Ir(acac)=0.2 and EHOMO = -4.8 eV, ELUMO = -2.6eV, respectively. The complex may be a promising electrophosphorescent material.
Preparation, Characterization and Photocatalytic Activities of ZnO/TiO2 Nanotube Composites
Authors: Li Jia Gui , Liu Guo Cong , Dong Hui
Published: December 2011

Highly dispersed ZnO/TiO2nanotube composites (NTCs) were successfully synthesized via a facile ethylenediamine-assisted deposition-precipitation route. This NTCs were characterized by XRD, TEM, and photcatalytic testing.The results revealed that hexagonal wurtzite phase ZnO NPs with an average size of about 2 nm were homogeneously dispersed and anchored on the surface of TiO2nanotubes (NTs) to form ZnO/TiO2NTCs, which exhibited excellent photocatalytic activity for photodegradation of methyl orange (MO) compared with P25 and Pure TiO2NTs. Furthermore, ZnO/TiO2NTCs possessed very favorable recycle efficiency due to their relatively high sedimentation rate and only slightly decrease of photocatalytic activity after a six- time recycle.
The Research on Microstructure of Catalyst and Growth Mechanism of Boron-Doped Diamond
Authors: Su Qing Cai , Zhang Jian Hua , Yin Long Wei , Li Mu Sen
Published: December 2011

The microstructure of catalyst discs and fracture topography of boron-doped diamond blocks are analyzed in this paper. The results show that boron can promote or inhibit the growth of diamond crystal. The battens of metal carbides in catalyst are the main carbon source in the nucleation and growth of diamond. Crystal nucleus can absorb the carbon atoms from metal carbide in catalyst disc, and continually grow. It is resulted that the carbon atoms around the diamond grains in catalyst disc reduce, and the battens of metal carbides are thin. The more diamond grains are produced, the thinner battens of metal carbides in catalyst disc are formed.
The Luminescence and Energy-Transfer of Ce3+, Tb3+ Activated Sr3B2O6
Authors: Lin Hui Hong , Wu Yun Ying , Chen Hai Yang
Published: December 2011

The phosphors Sr3B2O6: Ce3+, Sr3B2O6: Tb3+ and Sr3B2O6: Ce3+, Tb3+ were synthesized by the solid-state reaction method at high temperature. For the phosphor Sr3B2O6: Ce3+, the lowest 5d levels, the emission and the Stokes shifts of Ce3+ in the host lattice were identified. In addition, its concentration quenching process was also studied. For the phosphor Sr3B2O6: Tb3+, the f-d transitions of Tb3+ in the host lattice were assigned and discussed. Moreover, the energy transfer phenomenon between Ce3+ and Tb3+ in Sr3B2O6: Ce3+, Tb3+ was discussed. The emission of Tb3+ is significantly enhanced due to energy transfer from Ce3+ to Tb3+ when Ce3+, Tb3+ dopants were used together in Sr3B2O6.
Analysis on Primary Recrystallization Characteristics of High Permeability Grain-Oriented Silicon Steel by Inherent Inhibitor Method and Acquired Inhibitor Method
Authors: Yang Jia Xin , Liu Jing , Li Shi De
Published: December 2011

Contrastive analysis on recrystallized strips of high permeability grain-oriented silicon steel by inherent and acquired inhibitor method has been done, including structure, grain size, coincidence site lattice（CSL） and texture. Results show that the mean primary grain sizes of high permeability grain-oriented silicon steel by inherent inhibitor method and acquired inhibitor method of this experiment are 12.66μm and 27.95μm, respectively. The former is homogeneous structure while the latter is coarsened to some extent. Both primary recrystallized strips have equivalent percentage of ∑9 boundary, but the strip by acquired inhibitor method has higher percentage of ∑3 boundary than that by inherent inhibitor method. Both primary recrystallized strips have {111}<112> as the main texture component, however, the strip by acquired inhibitor method has（113）[5，-11，2] texture component, which is not desirable for ideal secondary recrystallization texture.
Influence of Lime Dust on Chloride Binding Capacity of Fly Ash-Cement Paste
Authors: Wu Xiang Hao , Yang Shan Shan , Zhang Cong Kai , Yuan Pan
Published: December 2011

The influence of the way and the volume of adding lime dust to fly ash-cement pastes on chloride physical adsorption capacity, chemical combination capacity and binding capacity of fly ash-cement pastes is investigated by adsorption equilibrium method. The results show that with the volume of lime dust as cement replacement raising, the amount of chloride physically adsorbed by fly ash-cement pastes reduces, while the amount of chloride chemical combining is firstly increase, and then decrease, and it reaches the maximum when the lime dust content is 10% , that of chloride binding is firstly increase, and then decrease, which reaches the maximum when the lime dust content is 5%. In addition, with the volume of lime dust as fly ash replacement increasing , the volume of chloride physically adsorbed by fly ash-cement pastes reduces firstly, and then raises, reaching the minimum when the lime dust content is 6%. Whereas, volume of chloride chemical combining and binding both decrease gradually with the increase of lime dust contents. When the population of lime dust as cement or fly ash replacement is low(less than 15% for cement and 9% for fly ash), effect of lime dust content on chloride binding capacity of fly ash-cement pastes is not obvious (under 7.5%).
Preparation and Adsorption Properties of PDMDAAC Modified Bentonite
Authors: Shao Hong , Cao Ning , Wang Da Wei
Published: December 2011

A novel environmentally friendly water treatment agent was prepared by the natural bentonite and PDMDAAC. The treatment effect of direct black G dyeing wastewater on different preparation conditions was studied. The decoloration rate reached 98.57% under the optimized conditions (cross-linker concentration of 40g/L, M-V of 12 g/L, contact time of 75min, particle size of 0.124mm). The performance characterization of the modified bentonite was observed by means of X-ray diffraction, scanning electron microscopy. The PDMDAAC has entered into the bentonite interplanar space. The adsorption properties of bentonite were improved, which was suitable for the treatment of dyeing wastewater.
Effect of Polymer Content to Mechanical Properties of Fly Ash Slurry
Authors: Lin Yue Zhong
Published: December 2011

In this paper, different polymer dosage in case of mechanical properties of fly ash slurry, through testing studies have shown that low-dosage strength of fly ash slurry has increased the role of high-dosage resulting in lower intensity, but the overall pressure off than reduced, improving the flexibility of fly ash cement, is it has a certain flexibility.
Numerical Analysis Programming on the Concrete Elastic-Plastic Behavior
Authors: Wang Hong , Jin Chong , Xia Xiao Zhou , Wang Zhong Ping
Published: December 2011

Using arc-length method, the progress of solving nonlinear function is discussed for designing new numerical analyzing tool, and the frame of programming based on nonlinear method is compiled. The results from completely restricted modeling show convex deformation and the damage on oblique section. And with the concrete elastic-plastic constitutive used in numerical simulation including add uninstall, typical engineering examples inspect reliability of the elastic-plastic numerical analysis program. This provides the basis and guidance for the future of the specific program design.
Study on Stability of AgI/TiO2 Visible Light Photocatalysts in Solutions of Various pH Values
Authors: Feng Lu , He Ke Feng , Chen Wan Ping
Published: December 2011

Nanostructured AgI/TiO2 photocatalysts exhibit highly efficient visible light photocatalytic activity. Though there have been extensive investigations on AgI/TiO2 photocatalysts, study on their stablity is still very limited. So in this paper, such a study is designed and conducted. AgI/TiO2 nanostructured photocatalysts were prepared and separately immersed in HCl solutions, DI water and NaOH solutions with pH value of 0, 4, 7, 10 and 14, respectively. X-ray diffraction and diffusive reflectance UV-vis spectroscopy analyses reveal that the immersion in acidic solutions led to the formation of AgCl and a blue shifting to 450nm for the absorption edge of AgI/TiO2, while the alkaline treatment had no significant effect on the composite structure of AgI/TiO2 or on the UV-vis absorption edge. Photocatalytic tests show that immersion in acidic solutions had more significant influence on AgI/TiO2 photocatalytic degradation of methyl orange (MO). At pH = 4, photocatalytic efficiency was dropped nearly 30%. At pH = 10, no significant change was observed. AgI/TiO2 nanostructured photocatalysts have thus been found to display a higher stability in alkaline solutions than in acidic solutions.
Sol-Gel Transition Kinetics of Konjac Glucomannan Dilute Solution by Fluorescence Technique
Authors: Xu Dong Ying , Liao Zheng Fu , Wang Hui
Published: December 2011

Konjac glucomannan (KGM) has been widely used in pharmaceutical, chemical engineering, food industry, drug carrier delivery, etc. The sol-gel transition kinetics of KGM dilute solution was studied by steady fluorescence spectroscopy in this article. The results showed that the gel point of KGM solutions depend on the concentration of KGM, pH value and temperature. The sol-gel phase transition activation energy, ΔE, was calculated to be 83.1 kJ/mol based on first reaction kinetic model.
Preparation and Mechanical Properties of Cotton Stalk Bast Fibers Reinforced Polylactic Acid Biodegradable Composites
Authors: Wu Zheng , Wei Chun Yan , Tian Zhi Fang
Published: December 2011

The cotton stalks bast fiber was a new kind of natural cellulose fiber, the fibers had the similar properties as the flax fibers. Polylactic acid (PLA) is a class of biodegradable matrix material. As the flax fibers can be reinforced materials and then compounded with PLA, cotton stalks bast fibers as reinforced materials and PLA as matrix were used to make a kind of green and biodegradable composite in the experiment. The composites were prepared by mixing, molding and cold forming. Orthogonal experiment table including length of the fibers, mass fraction of PLA, molding temperature and molding pressure was devised. Then the tensile strength, flexural strength and impact strength were tested and the analysis of range and variance was done. The optimal processing condition was obtained as follows: length of the fibers was 6mm, mass fraction of PLA was 75%, molding temperature was 175°C and molding pressure was 12MPa. The result showed that the cotton stalks bast fibers reinforced PLA biodegradable composites had good mechanical properties. Through this study waste cotton stalks basts were turned into useful resources and provided a kind of environmentally friendly composites.
Fenton-Like Mineralization of Anion Surfactant by Fe2O3/Attapulgite Catalyst
Authors: Zhang Ting , Yu Shu Rong , Feng Hui Xia
Published: December 2011

Fe2O3/attapulgite(ATP) catalyst was successfully prepared for Fenton reaction to degrade anion an surfactant, Sodium dodecyl benzene sulfonate(SDBS). Through a number of batch degradation experiments under various conditions, it was found that the reactivity of the system increased by increasing Fe2O3/ATP dosage and temperature. The SDBS degradation ratio will increase with increasing H2O2 concentration at some extent. But too high H2O2 concentration will make degradation efficiency decrease. The system maintains high efficiencies all experimental pH value(2-10).
Study on Pt-SnO2/C Electrode Prepared by Different Content of Nafion for New Direct Ethanol Fuel Cells
Authors: Ni Hong Jun , Lv Can Can , Wang Xu Hong , Zhu Yu , Huang Ming Yu
Published: December 2011

A carbon supported Pt-SnO2/C catalyst was prepared by hydrothermal method .The Pt-SnO2/C electrode was prepared by electrostatic spinning. Factors of product in solution, different Nafion loading and different loading of Pt-SnO2/C catalyst were evaluated for their effects on ethanol oxidation reaction (EOR). Electrocatalyst was characterized by SEM,EDS and XRD. At the same time, Electrocatalyst was tested by cyclic voltammetry (CV) , Chronoamperometry, AC impedance at three-electrode under similar conditions to those of the DEFC. The results show that the Nafion loadings was 7.5wt.％, which the loading amount of Pt was 1.5mg•cm-2, the Pt-SnO2/C electrode has the highest activity for ethanol oxidation. Compared to the low potential, the oxidation peak current density was 2 times high obtained.
Study on Photoelectrochemical Performance of ZnO Nanotube /CdSeQuantum Dot-Sensitized Solar Cell
Authors: Tao Ping Fang , He Jun , Liang Chun Jie , Han Jian Peng , Qin Li Qin , Pang Qi
Published: December 2011

ZnO; Quantum Dot-sensitized Solar Cell; CdSe; Photoelectrochemical property Abstract: ZnO nanotubes (NTs) were successfully fabricated with a hydrothermal method at low temperature. X-ray diffraction (XRD) and scanning electron microscopy (SEM) have been utilized to characterize the samples. The ZnO nanotubes, sensitized by CdSe, were used as a photoanode of a quantum dot sensitized solar cell, which generated a maximum power conversion efficiency of 0.95%.
Effect on Hydrogen Evolution Properties of PtCuLaOX Membrane Electrode by Oxygen Flow and Acid Treatment
Authors: Yang Bin , Huang Neng
Published: December 2011

In order to reduce production cost of making H2, one of the key points was to reduce Pt loading in Pt/C catalytic electrode. In our study, a new type of Pt/C membrane electrodes, PtCuLaOx/C heterogeneous structure, in which with developing different flow of O2, on the surface of carbonaceous substrates were manufactured by Ion Beam Sputtering (IBS) technology. These membrane electrodes were treated by annealing in vacuum furnace, and by different time in different concentration H2SO4 solution. The hydrogen evolution properties of these electrodes were tested by tri-electrode system, and were calculated results of their exchange current density (i0), decomposition voltage (Ed) and active specific surface area (ESA). It was found that PtCuLaOx heterogeneous membrane electrodes with Pt loading less than 0.041mg•cm-2 (the electrode area) undergone treatment, whose Ed, i0 and ESA was -0.223(V vs SCE), 4.562mA•cm-2 and 46.2811m2•g-1 respectively in balanced condition.
Ageing Precipitate Strengthening of Cu-Containing Structural Steels
Authors: Wang Hai Yan , Ren Hui Ping , Liu Zong Chang
Published: December 2011

Microstructure evolution of Fe-1.18%Cu high purity steels during solution and aging was investigated under high-resolution electron microscope (HREM). In addition, the aging strengthening mechanisms were discussed based on the microstructure observation. The results show that there were lots of Cu atom clusters in ferrite matrix during solid solution and aging initial stages, subsequently, Cu-rich metastable Fe-Cu particles precipitate at the aging strength peak. It is found that the intense strengthening is controlled by the coherency relationship of Fe-Cu metastable phase with matrix that forms the obstacle of the dislocation motion, while the decrease of strength after the peak is attributed to the loss of coherency, which should highly likely be the dominant reason of aging strengthening in Cu bearing high purity steels Thus our TEM observation results are in reasonably agreement with some previous assume.
Effect of Several Reagents on Photocatalytic Decolorization of Methyl Orange in Bi2O3 Suspension Systems
Authors: Zeng Feng Chun , Zhong Jun Bo , Zeng Jun , Li Jian Zhang
Published: December 2011

The photocatalytic activity of Bi2O3 photocatalyst towards decolorization of Methyl Orange (MO) was studied by employing several reagents. The influence of H2O2 on the decolorization efficiency was investigated in detail. Addition of ions such as CO32−, Cl−, and SO42- inhibits the photocatalytic efficiency.
Preparation of Tris(8-Hydroxyquinoline-5-Sulfonic Acid) Iron(III) Complex and Photocatalytic Property of Surface Modified TiO2
Authors: Jiang Feng Jun , Xue Wei Dong
Published: December 2011

Tris(8-hydroxyquinoline-5-sulfonic acid) iron(III) complex (Fe(HQS)3) was prepared and characterized by elemental analysis, infrared, nuclear magnetic resonance and Raman spectrum. The results indicated that the Fe atom was located at the center of the Fe(HQS)3complex and the sulfonic groups did not present in the quinoline three-coordinate structure. The TGA analysis result showed that the three ligands were thermally stable within wide temperature range (364 °C, 512 °C, 628 °C,). According to XRD and UV-vis data, the nano-TiO2prepared by hydrothermal method was mainly in the form of anatase and brookite, and the Fe(HQS)3complex had single crystal structure. Neither Fe(HQS)3nor nano-TiO2has observable photocatalytic activity according to the result of our methyl orange degrading experiment. The Fe(HQS)3-TiO2complex, however, demonstrated strong spectral response and photocatalytic activity under visible light.
Synthesis and Performance of LiCo1/3Mn1/3Ni1/3O2 Cathode Material for Lithium-Ion Battery
Authors: Liu Huan , Yao Yao Chun , Li Yong Mei , Yi Hui Hua , Dai Yong Nian
Published: December 2011

The layered cathode material for Li-ion batteries was synthesized by mechanical activation-high temperature solid state method. XRD and electrochemical measurements were used to characterize the structure and electrochemical performance of the product. The X-ray diffraction (XRD) patterns reveal that the material is crystallized to layered a-NaFeO2structure. The cathode material with excellent electrochemical performance was obtained by sintering the mixed raw materials with n (Li)/n (M) =1.11. The initial discharge capacity was 128mAh/g at a current density of 20mA/g between 2.7-4.2V and the discharge capacity retention was 96% after 50 cycles.
Surface Modification of LiCo1/3Ni1/3Mn1/3O2 with LaF3 for Lithium-Ion Batteries
Authors: Yang Zhan Xu , Qiao Qing Dong
Published: December 2011

LiCo1/3Ni1/3Mn1/3O2 has been modified with LaF3. The surface modified materials were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and galvanostatic charge-discharge cycling. The LaF3-coated LiCo1/3Ni1/3Mn1/3O2 had an initial discharge specific capacity of 178.0 mAh•g–1 within the potential ranges 2.75–4.5 V (vs. Li+/Li), and its discharge specific capacity is 168.7 mAh•g–1 after 50 cycles, much higher than that of the pristine LiCo1/3Ni1/3Mn1/3O2 (148.4 mAh•g–1). The improvement could be attributed to the LaF3 coating layer that hinders interaction between LiCo1/3Ni1/3Mn1/3O2 and electrolyte and stabilizes the structure of LiCo1/3Ni1/3Mn1/3O2 .
Evaluation and Optimization of The Factors Affectiing Enzymatic Hydrolysis of Silk Fibroin
Authors: Zhong Lei , Lu Bing , Liao An Ping
Published: December 2011

Enzymatic hydrolysis of silk fibroin is studied in detail by both single factor experiments and orthogonal experiments. The results of single factor experiments show that enzyme concentration, temperature and pH value have significant effects on the hydrolysis. With the changes of them, the structures of enzyme molecules will also change, which will cause different hydrolysis rates. According to the results of orthogonal experiments, the degree of influence of these three factors can be sorted in descending order: temperature, concentration and then pH value. The optimized conditions of hydrolysis achieved in this paper are enzyme concentration 0.5g/L, temperature 60°C and pH value 8.60.
Analysis of Monosaccharide Composition of Maize Pollen Polysaccharides
Authors: Wang Jian Bo , Wang Xiao Jie , Cao Hui
Published: December 2011

The monosaccharide was derived from α-naphthylamine and separated by high performance capillary electrophoresis in the borax buffer solution as carrier. The standard electropherogram of monosaccharide was analyzed. Polysaccharides with different purity from maize pollen were hydrolysised into monosaccharide and treated by the same method. The monosaccharide composition of polysaccharide was obtained.
Mechanical Properties of Ti-Nb-X-CPP Biomaterial Fabricated by Spark Plasma Sintering
Authors: Woo Kee Do , Park Sang Hoon , Kim Ji Young , Kim Sang Mi , Kang Dong Soo
Published: December 2011

Ti-6Al-4V ELI (Extra Low Interstitial) alloy have been widely used as alternative bone due to its excellent biocompatibility, although it still has many problems such as high elastic modulus and toxic. Therefore, biomaterial with low elastic modulus and nontoxic has to be developed. In this study, the raw materials which are nontoxic elements such as Nb and Mo were mixed and milled in a mixing machine (24h) and a high energy mechanical ball milling machine (1h, 4h and 8h) respectively. Ti-Nb-Mo-CPP composites were fabricated by spark plasma sintering (SPS) at 1000°C under 70MPa using mixed and milled powders. The effects of CPP contents and milling time on biocompatibility and mechanical property have been investigated. By X-ray diffraction (XRD), chemical reaction during the sintering was occurred and revealed new phases, Ti2O, CaO, CaTiO3, and TixPy. Vickers hardness of composites increases with increase milling time and addition of HA contents. Biocompatibility of HA added Ti-Nb-Si alloys were improved.
Print Parameters Influence on Parts' Quality and Calibration with 3DP-Part I: Print Parameters Influence on Parts’ Surface Topography
Authors: Li Shu Juan , Cao Shan
Published: December 2011

As an important Solid Free Form Fabrication (SFF) technology, three-dimensional printing (3DP) has become popular in applications due to its properties of rapid prototyping, no pollution, and high productivity. Based on the experiment platform of ZP310, this paper investigates that powder layer thickness and blinder saturation level for different location of parts placement have effect on the part surface topography and forming accuracy, the location of parts placement includes right, middle and left, respectively, which represents the different face contact to the bottom of manufacturing box. The experiments show that: when the left of part is placed to contact to the bottom of manufacturing box, the powder layer thickness is 0.1 mm and the binder saturation level is 70%, the best surface topography can be obtained.
Characteristics of Rust Layers Formed on Carbon Steel in Seawater
Authors: Bai Qiang , Zou Yan , Wang Jia , Zhang Lin Lin , Kong Xiang Feng
Published: December 2011

The corrosion products formed on carbon steel exposed to seawater were studied. Morphology, composition, structure and porosity of the rust were analysed by different methods: OM, SEM, FTIR, XRD and BET. The results indicate that the inner and outer rust layers formed on carbon steel in seawater are different in morphology, composition and structure. With increasing of exposure periods, the rust layers become more and more compact, which exhibit a high resistance to corrosion.
Multi-Objective Optimization by Gaussian Genetic Algorithm and its Application in Injection Modeling
Authors: Liao Xiao Ping , Ruan Ting , Xia Wei , Ma Jun Yan , Li Liu Lin
Published: December 2011

A method of combining Gaussian Process (GP) Surrogate model and Gaussian genetic algorithm is discussed to optimize the injection molding process. GP surrogate model is constructed to map the complex non-linear relationship between process conditions and quality indexes of the injection molding parts. While the surrogate model is established, a Gaussian genetic algorithm (GGA) combined with Gaussian mutation and hybrid genetic algorithm is employed to evaluate the model to search the global optimal solutions. The example presented shows that the GGA is more effective for the process optimization of injection molding.
Simulation of Drawing Process for Spring Seat of Spiral Step and Multiobjective Optimization
Authors: Sun Ling , Cheng Wu Hua , Xing Jian Wei
Published: December 2011

Finite element model of drawing is established and numerical simulation analysis is made based on the manufacturing status of uneven thickness distribution and frequent fracture occurrence of drawing spring seat of spiral step , and regression model of the maximum thinning rate and the maximum thickening rate of the drawn workpiece is established by taking the punch radius and clearance between punch and matrix of the workpiece as influencing factors. In addition, comprehensive quality evaluation model is created via multiobjective optimization and optimal punch radius and clearance is computed. The optimization scheme is proved to be feasible and effective through experimental verification.
Print Parameters Influence on Parts' Quality and Calibration with 3DP-Part II: Print Parameters Calibration and Contour Accuracy Control
Authors: Li Shu Juan , Cao Shan
Published: December 2011

In 3DP process, part has a large contour error due to the print machine, printing parameters, the characters of part materials and other factors. In this paper, based on the result from the Part I, the experimental method is used to study on the part contour error by placing 56 cubes in the manufacturing box in 3DP process. When the binder saturation level and the powder layer thickness are fixed, the contour error for cubes in X, Y and Z directions is obtained, and the leaking error compensation value, also means bleed compensation for the binder in different directions are achieved, and bleed compensation is used to calibrate the printer parameters. The case study also verifies the result in 3DP process, which is effectiveness in parts’ contour error compensation.
Precipitate and Age Hardening Response of As-Cast Mg-8Yb-0.5Zr Magnesium Alloy
Authors: Yu Wen Bin , Chen Zhi Qian , Zhang Mang , Yu Zhou
Published: December 2011

The precipitation hardening response of as-cast Mg-8Yb-0.5Zr magnesium alloy was investigated in the present work. The microstructure evolution of the alloy illustrated that Mg2Yb intermetallic phase was dissolved by solution heat treatment at 520°C for 12 hours. An apparent precipitation hardening response in Mg-8Yb-0.5Zr was discovered after artificial aging at 150°C, with maximum hardness increment of about 80 percent at the peak condition. It was found that the precipitates of the alloy were in the shape of two conjoined cosh and globe about 50 nm, and precipitated preferentially on grain boundaries and dislocations.