bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimization of Ultrasonic-Assisted Extraction of Total Saponins from Ophiopholis mirabilis Using Response Surface Methodology
Authors: Shao Zhi Yang , Fu Jin Xia , Qi Yan Xia , Zhao Qian Cheng , Li Zhi Bo
Published: September 2013

Ultrasonic-Assisted extraction (UAE) was applied for saponins extraction from Ophiopholis mirabilis and response surface methodology (RSM) was used to optimize the extraction technology. A first set of experiments were designed to optimize water bath temperature, ethanol concentration, the ratio of liquid to solid, ultrasonic time (min) and ultrasonic power (W) as the main variables affecting the extraction effect. A Box-Behnken design consisting of 15 experimental runs was then applied and a second-order polynomial model was used to explain the interactions between the main factors and the yield of saponins. The developed mathematical model was found to fit well with the experimental data and the optimized conditions were ultrasonic pretreatment time 30.9 min, ethanol concentration 64%, liquid /solid ratio 35:1, ultrasonic power 300W and water bath 70°C. Corresponding saponins content was 0.574%.
Plant Compound Curcumin Increased the Expression of MAP2 in Hippocampal Neurons of APPswe/PS1dE9 Double Transgenic Mice
Authors: Li Dan , Wang Chen , Tan Song , Li Yu
Published: September 2013

In this study, we aim to investigate the effect of curcumin on the expression of MAP2 in hippocampus in APP/PS1 double transgenic mice. AD model was established with APP/PS1 double transgenic mice, which were fed for 6 months with different concentration of curcumin diet. Immunohistochemistry were applied to evaluate the expressive of MAP2 in hippocampus of transgenic mice. The expression of MAP2 in hippocampus were decreased in APP/PS1 double transgenic mice, but increased in concentration-dependent manner in curcumin treatment group,especially in CA1 and CA3 region. MAP2 may play an important role in the generation or development of AD. MAP2 were injured in APP/PS1 double transgenic mice while curcumin could resume the expression of MAP2. Further research is needed to provide mechanism for this result.
Investigation of the Main Chemical Compounds in Pyrethrum Extract Obtained by Supercritical Fluid Extraction
Authors: Cai Ting Ting , Ye Min , Li Zheng Yue , Fan Lin Ming , Zha You Gui , Wang Jing
Published: September 2013

The main chemical compounds in pyrethrum flower extract obtained by supercritical fluid extraction (SFE) were identified by GC-MS. Peak area normalization was used to determine relative percentage content of the compounds. The results showed that the main chemical compounds in pyrethrum flower extract were β-farnesene, β-cubebene, ethyl palmitate and ethyl linoleate, besides six pesticidal active compounds of pyrethrins that were cinerin I, jasmin I, pyrethrin I, cinerinII, jasminIIand pyrethrinII.
Identification of Tocopherols from Rhodiola sachalinensis by Using GC/MS
Authors: Jin Yin Zhe , Cheng Yu Dong , Jin Ying Shan , Xuan Yong Hao
Published: September 2013

The tocopherols inRhodiola sachalinensiswere determined with adsorption column chromatographic purification and GC/MS. Tocopherols were extracted by sonication and Soxhlet with ethanol and dichloromethane, respectively. The extract was partitioned with chloroform and water using liquid-liquid extraction, and water part was partitioned with ethyl acetate, and purified with a silica column. Three type of tocopherols such as α, β, γ-tocopherol were identificated fromRhodiola sachalinensisby GC/MS. All of the three types of tocopherols were determined in the chloroform part, with some sterol and sterol conjugates. The similarities of the three types of tocopherols were nearly or above 90%, and the retention time of α, β, γ-tocopherols were 24.085, 23.194, and 22.458min, respectively.
The Study on Removal the PH3 in CO by Dephosphorization Bacteria
Authors: Deng Jing , Chen Liang , Wei Wen
Published: September 2013

For finding microbes of degradation phosphine (PH3) in CO, a low concentration PH3 gas in CO was used to induce domestication the microorganism from anaerobic tank of sewage treatment plant. The influence of domestication process was researched in detail, and the microbial growth and performance of dephosphorization domesticated was inspected. The results shown that PH3 concentration, pH, and replaced water have a greatly influence for the process. A group dephosphorization bacterium which have a characteristic of fast growth and reproduction and degradation PH3 in CO to phosphate was acquired after domesticated the bacteria from anaerobic tank more than 11d. Appropriate conditions of dephosphorization bacteria to degradation PH3 are pH=4.5-5.5, 30°C. The phosphine conversion rate was 68.59% and 65.32% for 24h respectively to the concentration of 12 ppm or7ppm PH3 in CO and the 2/3 of products was phosphate primarily. But the aerobic tank bacteria cannot be domesticated.
Study on the Extraction of Natural Essence from Green Tea Leaf by Supercritical CO2
Authors: Tan He Ping , Li Huai Ping , Guan Chi , Song Hang , Xu Yang , Ran Li Ping , Tang Xiang Kai
Published: September 2013

A simple and clean way of extraction of natural essence from green tea leaf by supercritical CO2 was developed. The optimum extraction conditions to produce the high-quailty natural essence were found: loading about 100g/L, operating at 5000 psi and 50 °C, and separation kettle temperature 75 °C, static extraction three times with 40 min every time, the yield of natural essence was 0.5%. The product was analyzed by gas chromatography-mass spectrometry (GC-MS) show that dimethylsulfide was the characteristic aroma components of the natural essence with more than 50 kinds of alcohols, ketones, aldehydes, ethers and esters etc.. There were only little other biochemical composition of raw material and 0.4% caffeine in the product detected by high-performance liquid chromatography (HPLC), and the biochemical composition in the raw material were almost no loss before and after extracted by supercritical CO2, it indicated that the specificity of the method for extraction tea natural essence is very strong, and propitious to improve the secondary utilization of the tea raw materials.
Optimization of Enzymatic Hydrolysis for Protein from Black Bean by Response Surface Methodology
Authors: Zhang Hai Yue , Tian Tian , Chen Hua
Published: September 2013

Taking the degree of hydrolysis (DH) as the index, the optimal hydrolysis process for the protein from black bean was explored by response surface methodology (RSM) to prepare polypeptides. Four proteases were used to hydrolyze the black bean protein and determine the DH of black bean protein. The results indicated that the optimal reaction systems were as follows: The black bean protein solution was treated with the alkaline protease hydrolysis firstly and then the trypsin hydrolysis was used in order to improve the DH. The DH of protein was increased to 35.64% and the yield of peptides production was higher than using only alcalase.
The Optimization Study on Solid Culture Medium of North Cordyceps
Authors: Qin Xiu Li , Han De Ming
Published: September 2013

Artificial cultivation of solid culture medium of North Cordyceps was optimized in this experiment. The results show that, the North Cordyceps can be cultivated in many types of solid culture medium, the growth rate and density of the hyphae was highest in a single solid culture medium with rice as the solid substrate, but adding 10%-15% wheat bran in rice solid culture medium, the growth rate and density of the hyphae is better than the single matrix of rice; the suitable nutrient solution was determined by contrast test and L9 (34) orthogonal test, the composition was sucrose 2%, yeast extract 1.5%, MgSO40.1%, KH2PO4 0.1%; the suitable solid culture medium of the North Cordyceps sinensis was determined by the L9 (33) orthogonal test, the composition was rice 85%, wheat bran 15%, pH 5.5-6.5, the ratio of solid and water ( solid matrix / nutrient solution )was 1:1.5.
Influence of Astaxanthin on Pearl Oyster Pinctada martensii
Authors: Ji Li Li , Liao Jie , Song Wen Dong , Liu Jian She , Ma Xiao Tian
Published: September 2013

In the study, through the addition astaxanthin into the bait for the pearl oyster Pinctada martensii for 3 months, we studied the accumulation and existence form of astaxanthin in pearl oyster through qualitative and quantitative analysis which adopted High Performance Liquid Chromatography method; the transmission of astaxanthin in shells was detected by Micro-Raman spectrometry. The results showed: 6.870±1.356μg/g of astaxanthin existed in the control group of Pinctada martensii, and 74.799±5.907μg/g of astaxanthin existed in the experimental group, some of them were existent in the form of astaxanthin esters. Weak carotenoid characteristic peak occurred in the control group, while the carotenoid characteristic peaks intensity enhanced obviously in the experimental group, which illustrated remarkable increase of carotenoid content in the shell. These findings will not only provide the basis for colorful pearl cultivation via food-borne transmission but also lay a foundation for further artificial regulation and control of pearl color.
The Bioassay of Four Kinds of Terpene Monomers and Complexes
Authors: Wang Hui , Ma Wei , Song Shi Li , Sun Ri Xu , Ma Ling
Published: September 2013

This paper measured the acute toxicity of four kinds of terpenes monomer to tenebrio molitor (12h,24 h,36h,48h),using Finney formula method evaluate the acute toxicity (48h) of the 10 mixed composition from four kinds of terpenes monomer to tenebrio molitor.The results show that the toxicity of four kinds of terpenes monomer to tenebrio molitor was high toxic,and the order of the toxicity was 1,8-cineole>β-pinene>α-pinene>α-terpineol.In the measurement data of 10 mixed composition,9 of them were addictive effect,which was accounting for 90% of the total.One of the mixed copositon had synergistic effect,accounting for 10% of the total.That was when the ratio of 1,8-cineole,α-pinene,α-terpineol is 6:1:1,the cotoxicity coefficient of mixed composition was 2.8254,greater than 2.6,showed a synergistic effect.It can be used as the best ratio and it laid an important foundation for research and development of bionic pesticide.
Determination of Metal and Semimetal Elements in Chinese Gum Rosin by ICP-OES
Authors: Zhang Ping Hui , Xu Rong Sheng , Zhao Zhen Dong , Bi Liang Wu , Lu Yan Ju , Chen Yu Xiang , Li Dong Mei , Wang Mi Xia
Published: September 2013

Chinese gum rosin were digested by microwave-assisted sample digestion, and then the metal and semimetal elements in it were detected by inductive coupled plasma optical emission spectrometer (ICP-OES). Most metal and semimetal elements mass fractions in gum rosin are less than 5.0mg/kg, among which mass fractions of Al, Ca, Fe, Mg, Na are relatively higher. Some metal and semimetal elements in gum rosin may influence auto-oxidative rate to bring about color changing.
Washing Method, an Accurate Detection Method of Urinary Nanocrystallites to Eliminate Interference of Soluble Components in Urine
Authors: Shang Yun Feng , Kuan Li , Zhu Wen Yu , Ouyang Jian Ming
Published: September 2013

Using X-ray power diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR), the chemical composition of urinary nanocrystallites from 3 calcium phosphate (CaP) stone-formers were investigated and compared with that from healthy subjects. The main components of nanocrystallites in urine of CaP stone formers were uric acid and CaP, while that in healthy urine was mainly uric acid, which indicated a significant difference. This study purposed an accurate detection method of urinary nanocrystallites, namely washing the urinary crystallites samples with double distilled water, which can avoid the interference of soluble components (such as NaCl, uric acid, and urea) that were precipitated from urine during sample preparation.
Study on the Root Activity with Seven Plant Growth Regulators in Room
Authors: Chen Wei Yan , Xu Liang Zhong
Published: September 2013

This paper aims to study the root activity of wheat and radish seeds with seven plant growth regulators in room through seed soaking. The results show that it mainly affects the stem height of wheat seed when it was 1000 dilution of the 7 plant growth regulators, but it mainly affects the main root length of wheat seed when it was 5000 dilution. when we treat radish seeds in 1000 and 5000 dilution , there were obvious effect on stem height and main root length, this study is helpful for field planting.
Characterization and Synthesis of Quaternary Ammonium Salt of Chitosan by Open-Loop Method of Epoxy Derivatives
Authors: Gong Sheng Zhao , Cheng Jian Hua
Published: September 2013

Quaternary ammonium salt of chitosan (HACC) was synthesized by the reaction of chitosan(CTS) and 2, 3-epoxypropyltrimethyl- ammonium chloride(GTA) in isopropanol. The influence factors of the degree of substitution of synthetic reaction, such as the molar ratio of reactants, the reaction time, temperature and so on were discussed by single factor experiments.The results showed that the optimal conditions for the preparation were nGTA: nCTS=4:1, the reaction time 8h, the reaction temperature 75°C, the reaction pH value 7, the alkalization time 14h, the molecular weight of chitosan 320000g/mol, the moisture of reaction system 20%. The structures of HACC and CTS were characterized by infrared spectrum, the appearances of morphology of HACC and CTS were researched by scanning electron microscopy, the thermal stabilities of HACC and CTS were studied by thermogravimetry. The results showed that the substitution reaction mainly occurs on the N element, modified derivatives had significant changes in appearance and size, and lower thermal stability.
Synthesis of Fragrance 1-(3,3-dimethylcyclohexyl)Ethyl Acetate
Authors: Shen De Li , He Xin , Guan Wei , Liu Yu Ping , Sun Bao Guo
Published: September 2013

1-(3,3-dimethylcyclohexyl) ethyl acetate was synthesized by the reaction of dihydromycene with acetic acid in the presence of sulfuric acid. The effecting factors including the amount of catalyst, the reaction temperature, the molar ratio of raw materials and the reaction time were investigated. The experimental results showed that the molar raio of the dihydromyrcene to acetic acid to sulfuric acid was 1:3:0.2, the reaction temperature is 60 °C and the reaction time was 6.5 h. The yield reached 45.3%. The structure of product was characterized by gas chromatography, mass spectrometry, infrared spectroscopy and nuclear magnetic resonance. The odor evaluation result indicated that the product had a sweet, woody, floral odor.
Study Changes in Tool Wear of Stainless Steels ELC X01Cr18Ni10Ti when Drilling
Authors: Jurko Jozef
Published: September 2013

The basic hypothesis of this article focuses on the study changes in mechanical properties of stainless steels ELC X01Cr18Ni10Ti under surface finish when drilling. The problem of drilling holes with diameter D=3 to 10 mm resides in the fact that 30 to 40% of these holes do not comply with prescribed requested requirements1. This article presents the results of experiments focusing on the study of the damage process in helical drills with diameter d=6.0 mm when drilling into austenitic stainless steel ELC X01Cr18Ni10Ti. This study also includes an analysis of accompanying phenomena in the cutting zone by measuring some selected parameters.
Flow Velocity Affecting Dendrite Growth of Fe-C Alloy
Authors: Yuan Xun Feng , Yang Yan
Published: September 2013

The phase field model coupling with the concentration field and flow field is used to simulate the dendrite growth during isothermal solidification of Fe-C alloy in a forced flow. The effects of flow velocity on the dendrite growth are studied. The results indicate that with introducing the forced flow, the upstream secondary dendrite arm space decreases, the downstream secondary dendrite arm space increases. As flow velocity increases, the side branch at the upstream regions become bulky and tilt, the side branch at the downstream regions degenerated and even disappear, the length of upstream dendrite arm increases linearly, the length of downstream dendrite arm decreases parabolically. Meanwhile, the solute concentration of upstream dendrite tip increases slowly first, then decreases, the solute concentration of downstream dendrite tip increases monotonously.
Interaction between Sodium Molybdate and FSWed Weld of 5083 Effected by Temperature
Authors: Shen Chang Bin
Published: September 2013

Similar welds composed of 5083 were produced by friction stir welding. In the solution of 0.2 M NaHSO3 and 0.6 M NaCl, with the addition of a given concentration sodium molybdate as the inhibitor, the electrochemical corrosion behaviors of the friction stir welds (FSW) and 5083 were comparatively investigated by potentiodynamic polarization curve tests and electrochemical impedance spectra (EIS) for different test temperatures (herein, 25°C,30°C,35°C,40°C). The results indicated that at 30°C, the anti-corrosion property of 5083 FSW weld and parent material was superior to those of the other temperatures.
Effect of SF6 Concentrations on Protective Film of Vacuum Counter-Pressure Filling Molten Magnesium Alloy
Authors: Yan Qing Song , Zhen Yang , Xiong Bo Wen , Lu Gang , Lu Bai Ping
Published: September 2013

Through testing and analyzing Surface micromorphology of protective film and elemental composition and content of vacuum counter-pressure filling AZ91D magnesium alloy by SF6 mixed gas, the effect of SF6 concentrations on protective film of vacuum counter-pressure filling molten magnesium alloy was studied. The results show that SF6 concentrations have greater effect on protective film of molten magnesium alloy. With the increase of SF6 concentrations, surface micromorphology of protective filmof vacuum counter-pressure filling AZ91D magnesium alloy becomes more continuous and dense. Meanwhile, the mass fraction of F atom of the protective film is increased, and the content of O atom is decreased. Moreover, F/O atomic ratio increases significantly too, so MgF2 content of the protective film increases gradually. Therefore, protective effect of molten magnesium depends on F/O atomic ratio and MgF2 content of the protective film. When SF6 concentrations are greater than 4.8 , protective effect of molten magnesium is good.
Quantitative Risk Assessment of Oil Well Casing Strings under Non-Uniform External Loadings
Authors: Long Gang , Guan Zhi Chuan , Liao Hua Lin
Published: September 2013

Considering the uncertainty and randomness of casing loadings and geometry sizes, performance parameters in deep wells, a kind of calculation method of probability distribution of casing external loading and collapse strength was established. Based on the Monte-Carlo method, the probability distribution of casing strength was simulated under non-uniform external loading conditions. With strength-load interference theory, the calculation method of casing safety reliability was obtained, which can analyzes reliabilities of different types of casing strings subjected different loadings in the dangerous section, and a regional relationship between casing reliabilities and safety factors is established. Results show that when casing reliabilities collapse strengths are in the range of 0.5-1.0, the related safety factors locate from 1.0 to 1.25. Safe reliability analysis can provide references for casing strength designs in deep and super deep wells.
Separation and Dissolution of Phases in 40CrNiAl Alloy during Heat-Hardening
Authors: Mazhyn Skakov , Gulnara Yerbolatova , Dossym Yerbolatuly , Michael Scheffler
Published: September 2013

It is shown that the process of-phase particles dissolution in the alloy matrix is faster at superplastic deformation than during annealing. Identify ways of 40CrNiAl alloy strengthening treatments after superplastic deformation were determined. Use after superplastic deformation re-quenching and aging leads to an effective hardening of 40CrNiAl alloy. In grains of-matrix allocated secondary lamellae of-phase intermittent mechanism.
Influence of Important Factors on Ammonia Leaching of Alkaline Zinc Oxide Mineral
Authors: Jia Xiao Dong , Wei Zhi Cong , Liu Dian Wen , Yuan Jing Jie
Published: September 2013

The effects of refractory zinc oxide ore which came from Lanping of Yunnan Province were studied using agitation leach method in laboratory in order to find out the optimum leaching conditions. The optimum conditions obtained are as follows: ammonia concentration 3mol/L, ammonium bicarbonate 1.5mol/L, granularity (-0.074mm) about 85%, solid to liquid ratio 4:1, and leaching time 2h. On this condition, the test obtained the better index of the zinc leaching rate 74.4%.
The Effect of Diameter of Stirrer on Microstructure and Mechanical Properties of Joint Braze by Stirring Brazing of Al/Mg Alloy
Authors: Sun Hui Bin , Xu Hui Bin
Published: September 2013

2024 al alloy and Az31B Mg alloy joint by stirring brazing without flux in air. The microstructure and mechanical character of the interface were investigated. The results show that the maximum shear strength of the Al interface can up to 58.7Mpa and 37.5Mpa to Mg interface.
Contact Stress Analysis and Optimization Design of Ball Cage Patterned Constant Speed Universal Joint
Authors: Cai Yun Guang , Li Yan , Shi Yao Chen
Published: September 2013

This paper takes ball cage patterned constant speed universal joint of as the research object. Using the 3 d modeling software solidworks to establish solid model and simplified it . Based on ANSYS, do finite element contact stress analysis by the universal joint of the two kinds of condition. find out the weak part,through the improvement of raceway design parameters, Relieve the stress concentration phenomenon, reduces the maximum stress, increases the service life of universal joint.
Research on Unconventional Layouts of Aircraft
Authors: Shang Yong Feng
Published: September 2013

This chapter describes how the overall configuration of the aircraft is decided from the many options available to the designers. From a brief historical perspective the chapter then looks at the unconventional layouts that have been considered in the recent past. Although these have not yet found favor with designers it is worth keeping them in mind as conditions and constraints may change in the future. Such changes could make current layouts less attractive or even not feasible. New designers should start a new project with a completely open mind and this means a careful consideration of all configurations particularly in a historical context.
The Analysis on the Keyless Coupling of Rudder System by Means of the Finite Element Method
Authors: Wu Peng Peng , Pan Dao Yuan , Gao Zhong Xue , Zhang Yu Zeng
Published: September 2013

Based on actual working conditions and parameters of the rudder system, the purpose is optimizing the connection of rudder system by keyless coupling technology. Analysis on the keyless coupling of rudder system is done by the finite element method under impact loads in different directions. It can improve the performance of keyless coupling in the specific operation conditions of rudder system to be excellent. According to the test requirements of the torque and impact, the results of the completion of the finite element analysis are verified by establishing the experimental platform of keyless coupling. Experiments and analysis of the results show that the preload is formed by the hydraulic nut in the keyless coupling and the static frictions is formed between the rudder and tiller. In the meantime, it is formed between rudder and the rudder blade which can make the working state of the rudder system stable under the required torque and impact loads.
Parameter Design of Cylinder Gear Pairs with Small Number of Teeth
Authors: Gu Shan Shan , Zhang Lian Hong , Tan Yan Qing
Published: September 2013

Gear transmission with a small number of teeth is widely used as a key component of mopeds, motorcycles, electric bicycles and so on. A parameter design of cylinder gear pairs with small number of teeth was put forward, which was carried out by establishing a optimization model and selecting the preliminary parameters of gear pairs, and then adjusting the parameters according to the meshing interference conditions and the strength theory. The parameters of the compact gear pairs, which meet transmission quality requirements and strength condition tested by finite-element analysis, can be obtained ultimately. The feasibility and rationality of this method are verified by case.
Experimental Study on Wave Dampening Ability of Floating Breakwaters
Authors: Teh Hee Min , Mohammed Nuzul Izani
Published: September 2013

Floating breakwaters are gaining increased importance in many marine and coastal applications. Various researches have been conducted to optimize the design of floating breakwaters so as to attain greater hydraulic efficiency and functional value. In this research, two floating breakwaters of different design were developed with the aim to reduce wave energy mainly by reflection and energy loss. Both breakwaters (Model 1 and Model 2) possessed a rectangular body with a pair of arms at the top and a pair of legs at the bottom. The legs of Model 1 and Model 2 were upright and 45o slanted, respectively. Hydraulic performances of these breakwaters subjected to unidirectional monochromatic waves were assessed by the means of physical modeling, and were subsequently quantified by the energy coefficients, namely the coefficients of wave transmission and reflection, and energy loss. The major experimental finding for this study is that Model 1 is a dissipative-type breakwater and Model 2 is a reflective-type breakwater. Both models are efficient wave attenuators and are capable of suppressing the incident wave heights up to 80% in shallow water condition.
Research on Walking Mechanism Base on Biological Metal Fibre
Authors: E Shi Ju , Ding Xuan Zhong
Published: September 2013

A new walking mechanism base on biological metal fibre is study in the paper. It used a new type of shape memory alloy (biological metal fibre, BMF) as actuator. The multilegged walking mechanism is employ and study. Its mobile mechanism and trajectory planning is analysed so as to achieve miniaturization goals. The simulation results showed that the multilegged walking mechanism could be effectively driven by the actuator base on BMF.
Modeling and Simulation of the New Thin Film Transformer Equivalent Circuit
Authors: Hu Xiao Ping , Zheng Liang , Zhong Ye Long , Ye Li Yun
Published: September 2013

We research the new thin film transformer equivalent circuit modeling, simulate and modify the traditional estimate formula of the transformer equivalent circuit parameters, in order to attain the automatic extraction of thin film transformer parameters. This paper used MATLAB and Agilent ADS on the thin film transformers for the S parameter simulation. The simulation results show the estimation has better accurate and universal, it also shows the effect of different number of turns and thin film materials on the properties of thin film transformer.
Phase Field Simulation of Precipitation on Edge Dislocation
Authors: Gao Ying Jun , Zhu Tian Xia , Zhou Wen Quan , Huang Chuang Gao
Published: September 2013

The second phase nucleation and precipitation around an edge dislocation are studied using phase field method. A new free energy function including the elastic strain energy is established to describe the dislocation interaction with the solute. The results give the distribution of strain field of dislocation and show the precipitates grow up according to the power growth law with the index 2. The simulated results are in good agreement with that of theory of non-uniform nucleation.
Fabrication and Characterization of Graphene/Polyimide Nanocomposites
Authors: Wang Xuan Lun , Huang Wei Jiu
Published: September 2013

Graphene/polyimide nanocomposites with different weight loadings were prepared by a solution compounding technique. Graphene was synthesized from graphite oxide that was fabricated by the Hummers method. X-ray diffraction (XRD), ultraviolet visible (UV-vis) spectra and simultaneous thermal analysis were used for the microstructure analysis of the graphenes. Graphenes with single layer structure were synthesized successfully and had good solubility in water or other polar solvents due to a few functional groups on the graphene carbons. Graphenes have good thermal stability. Mechanical and tribological properties were studied for the graphene/polyimide composites. The composites have excellent strength and toughness with very small graphene loading level and the addition of graphene decreased the friction coefficient and wear rate of the composites.
Design and Analysis of Fault Diagnosis System of Electrohydraulic Servo Valve Based on ANN
Authors: Li Yao , Yi Jian Gang
Published: September 2013

It is a difficulty to combine artificial neural networks (ANN) with the fault diagnosis of electrohydraulic servo valve. To slolve this problem, the fault diagnosis mechanism of electrohydraulic servo system is analysed, the effecitveness of fault diagnosis based on ANN is verified, and the pressure characteristic data are used to construct ANN samples. Finally, the algorithms of RBF, BP and Elman are compared with the built system and sampled. The results show the RBF algorithm is more rapid and accurate and the proposed intelligent fault diagnosis system of electrohydraulic servo valve is valuable.
Modification and Application of Gaussian Plume Model for an Industrial Transfer Park
Authors: Shang Xiao Qin , Li Yun Yun , Pan You , Liu Ru Feng , Lai Ya Ping
Published: September 2013

Applying diffusion model in gas leakage incident consequences analysis could provide favorable technical support and professional assistant method for accident emergency response with great realistic significance for industrial transfer park. The core of analysis lies in the selection and rational use of diffusion model. GPM for continuous released condition with some foundation hypothesis conditions should be modified in practice. Comprehensive amendment was discussed and implemented in this paper based on actual circumstance situation in order to achieve the objective of higher accurater analysis. The improvement successfully enhances the model analysis ability and applicability, which could play a role as an important component in the emergency response system for the parks management.
Sensitivity Analysis in Artificial Neural Network and it's Applications on the Research of Attributes Correlation
Authors: Lin Hong Yan , Xing Hai Hua
Published: September 2013

Sensitivity analysis method can evaluate the importance of model input attributes. A multivariable sensitivity analysis method based on neural network connection weights and a calculation method of attributes correlation are proposed in this paper, and are applied to the research of attributes correlation. To verify the effectiveness of the proposed methods, this study employed a man-made example and a UCI-IRIS dataset to test the performance of the method. The results show that the sensitivity analysis method can really identify important and strong correlation attributes of model, and can simplify the model effectively, and can improve the accuracy of the model.
Exploration on the Cultivation of Engineering Quality through Chemical Engineering Technology Teaching
Authors: Zhang Nan Zhe
Published: September 2013

The chemical engineering technology linked chemical engineering professional knowledge to engineering practice is an important compulsory course. Through combining the theory teaching reform and practice teaching of the chemical engineering technology, it can not only strengthen theory knowledge of chemical engineering technology, but also emphasize the engineering concept and enhance the abilities to analyze and solve the engineering problems.
The Comprehensive Performance Evaluation to LSSC Based on Grey Relational Analysis
Authors: Yang Qiang , Zhuang Yi
Published: September 2013

Based on the full consideration of the structure and coordination in the service supply chain, an evaluation system focusing on evaluating the logistics service supply chain performance was set up. In this paper we introduce the grey theory into the evaluation system and construct an evaluation model based on grey relational analysis method. The example shows that the grey relational analysis can whiten the unascertained relationship between the evaluation factors effectively, reduce the influence of subjective factors, and improve the accuracy of the evaluation.
Training Status and Cultivation Approaches of Double-Qualified Teachers in Engineering Universities
Authors: Wang Yue , Zhao Li Li , Guo Xiao Fei
Published: September 2013

The role of the double-qualified teachers in the talents cultivation is more and more important. In this paper, the current situation of teachers training was analyzed, and the facing problems were discussed. According to these problems, the necessity of double-qualified teachers cultivation was emphasized and the specific training ways were provided.
Analysis of Asian Logistics Trade and Merchandise Growth
Authors: Liu Chi Fang , Kao Tzu Yorn , Chang Ya Fen , Tsai Yi Ru
Published: September 2013

Analysis of simulation , go on sequentially according to the step designed: (1)Select the national targets analyses, (2) consult the research model of the foreign research institution, select the important ginseng parameter which influences the national risk, (3) predict or suppose that joins perhaps changes the direction and degree of the parameter, (4) observe the risk parameter susceptibility under different situations, (5) explain the reason why the risk changes. Set up the relevant research database in the country in Southeast Asia at the same time , collecting the materials respect can pass relevant organizations , such as foreign trade association , Bank of Communications ,etc. , or investigate the relevant various countries , key unit of interview and relevant research institution or the manufacturer . In addition, can exchange through the international materials, set up database line and information and exchange plans with the domestic and international relevant research institution.
Discussion and Analysis on Characteristics of Tombs of Jin Dynasty in Shanxi - Imitated Wooden Structure and Wall Brick Decoration
Authors: Wan Qi Zhen , Zhao Qing
Published: September 2013

Shanxi Region is one of the places with most imitated wooden structure tombs of Song and Jin dynasties discovered. These tombs represent the architecture technique level of north China of that period to some extend and have a high research value of architectural history. Due to the reasons in geographical conditions, history and national traditions, the tombs in different places have some regional differences, reflected in not only the tomb shape and structure but also in the material, method and theme of tomb chamber decoration. This paper, dividing Shanxi into four regions, is focused on analysis of shape, wall brick decoration methods and themes of imitated wooden structure tombs of Jin Dynasty, so as to further understand the inheritance and development of Chinas traditional architectures.
The Material Aesthetics Transformation of Jewelry Design
Authors: Li Jian Wen
Published: September 2013

With the Value Change of Jewelry itself, Jewelry Culture has Become an Independent Art Discipline. Modern Jewelry has Widely Served as Expression Media of Information，and the Standard Judging the Value of Jewelry has Transferred from those Expensive Materials such as Gold, Silver and Jewel to those Cheap, Common Materials of Environmental Protection. in the Process of Redefining the Material, the Common Materials are Endowed with Rich Cultural Connotations through Design and Become the Carrier of the Multisense of Modern People.
Research on Artistic Innovation of Phoenix Totem Symbol
Authors: Li Peng , Liu Jie
Published: September 2013

Through thousands of years’ integration and development, phoenix totem has become one of the symbols representing unique oriental feature of China. Application of phoenix totem symbol in design is not only a reference for graphics, but also an extraction of traditional phoenix totem symbol, giving the rein to phoenix totem symbol in modern advertising design
The Study of Curing Characteristics of Epoxy Asphalt
Authors: Zhang Yan Jun , Cao Dong Wei , Zhang Hai Yan , Wu Xiao Wei
Published: September 2013

Epoxy asphalt has been proposed for the steel bridge deck and the heavy traffic on the road because it shows excellent heat resistance, free from bleeding, low temperature cracking resistance. In this paper, the curing characteristics of epoxy resin system and epoxy asphalt system were studied. The curing time and the viscosity of different epoxy resin and epoxy asphalt systems were tested. Experimental results indicated that: In the pure epoxy system, the curing time was decreased with the content of curing agent and accelerator increasing, and increased with the diluents addition. Epoxy asphalt was prepared after asphalt system addition; the viscosity was increased with curing time increasing and accelerator content increase. The allowable reserved time was decreased with the accelerator content increase. The growth of the system viscosity was slowly and the curing of epoxy asphalt was hindered with the more asphalt addition.
Laboratory Investigation of the High Phosphorus Hot Metal Dephosphorization Pretreatment Using Multi Phase Flux
Authors: Zhou Jin Dong , Bi Xue Gong , Yang Fu
Published: September 2013

The difficult problems in dephosphorization pretreatment of the high phosphorous hot metal are extremely high flux consumption and very large temperature drop. Dephosphorization with multi phase flux would be helpful to solve these difficulties. In this paper, 2CaO·SiO2 was used as the solid phase and the effect of slag composition and solid/slag mass ratio on dephosphorization efficiency of the high phosphorus hot metal was investigated in the laboratory. Dephosphorization capacity of nine multi phase fluxes was determined by means of equilibrium experiment and it is revealed that dephosphorization capacity of the multi phase fluxes is controlled by the slag composition when solid/slag mass ratio is within 0.30; as solid/slag mass ratio exceeds 0.30, dephosphorization capacity of the multi phase fluxes increases with increasing the ratio. Pretreatment experiments of Fe-0.5%P-0.15%Si-4.5%C were conducted with multi phase flux at 1400 °C (1673.15 K). The test results show that replacement of slag with 2CaO.SiO2 particles on mass ratio of 50:50 brings about smaller finale [%P], suggesting dephosphorization of the high phosphorus hot metal with multi phase flux is beneficial to the reduction of flux consumption. Moreover, the experimentally determined equilibrium MgO concentration in the multi phase fluxes decreases with increasing solid/slag mass ratio when the ratio exceeds 0.30, implying dephosphorization with multi phase fluxes of higher solid/slag mass ratios is beneficial to the control of reactor linings corrosion.
Study of Adherend Thickness Influence on the Bond Strength of Carbon/Epoxy Composite Joints
Authors: Liu Li Hong , Zhang Jian Guang , Wen Yong Hai
Published: September 2013

In this paper, adherend thickness influence on the bond strength was evaluated by single-lap shear testing. The adherend for joining was carbon/epoxy composites with four different thickness made of fabric prepregs. The adhesive system for joining included two types of adhesive film, namely J-135 and J-95. The results showed that adherend thickness have a significant influence on the bond strength. In the range of adherend thicness from 2.26 mm to 4.52 mm, the bond strength demonstrated a wavy change with increasing adherend thickness. Through comparison of the bond strength of joints with two adhesives at room temperature and aging condition, adhesive J-95 was proved to have better resistance to elevated temperature and humidity than J-135.
Synthesis of Nanostructured PdMo Electrocatalysts for Oxygen Reduction Reaction in Fuel Cells
Authors: Cao Chong Jiang , Liu Xiao Geng , Liu Qin
Published: September 2013

Carbon black supported Pd-Mo bimetallical nanoparticles are prepared by Strong Electrostatic Adsorption (SEA) method. A series of Pd-Mo catalysts were prepared by selective deposition of the [Pd (NH3)4]+2cationion onto the supported MoO3phase. The prepared materials are characterized by N2-BET, powder XRD and STEM. The results showed that good dispersion of bimetallic nanoparticles on the carbon support is observed from STEM images. Oxygen reduction measurements performed by linear sweep voltammetry indicat the good catalytic activity of Pd-Mo by SEA compared to dry impregnation (DI) bimetallic catalysts since the SEA technique produced more well dispersed and intimately designed bimetallic particles after reduction.
Study on Zeta Potential of Micron-Size Tourmaline Powders
Authors: Zhang Xiao Hui , Wu Rui Hua
Published: September 2013

Zeta potential of micron-size tourmaline powders are studied using the laser granulometer and the Zeta potential analyzer. The result from the experiment shows, in the neutral condition, the micron-size tourmaline is negatively charged under water and Elbaite powder has the highest Zeta potential among all tested ones; the smaller the tourmaline powder is, the higher Zeta potential it has; heat-treated samples under reducing conditions have higher Zeta potential than those under oxidizing conditions by 4~5 mV; Dravites isoelectric point is 3.4, falling within the acid range.
Analysis of Graphene Based on Femtosecond Probing
Authors: Cui Hong , Zhang Xian Bin , Liang Qi Jun , Su Jun Fei , Yang Peng , Duan Yu Zhi , Shi Wei
Published: September 2013

Graphene is the two-dimensional building block for carbon allotropes of every other dimensionality. We report the terahertz spectrum of Non-uniform graphene films based femtosecond probing with more than 6 THz spectral coverage and the 1 GHz resolution using high-speed asynchronous optical sampling, and it operates at 2 kHz scan rate without a mechanical delay stage. The overall waveform creates shock and the oscillation amplitude reached 0.37E-4 mV, main-peaks time delay is 151.83fs between graphene and substrate, frequency spectrum oscillatory fades at 2.8 THz and appeared obvious absorption peak.
Nanodiamond/Polyimide High Temperature Dielectric Films for Energy Storage Applications
Authors: Wang David H. , Fillery Scott P. , Durstock Michael F. , Dai Li Ming , Vaia Richard A. , Tan Loon Seng
Published: September 2013

CP2 polyimide (prepd. from 6FDA and 1,3-bis (3-aminophenoxy) benzene) was blended with (1-50 wt.%) detonation nanodiamonds (DND, pristine, acetone-washed, and 4-(2,4,6-trimethylphenoxy) benzoic acid-functionalized), and the blends were evaluated as thin films for its potential utility in high-energy-density capacitors that would have stable dielectric properties over a wide temperature range (-55 to 300°C) and at frequencies up to or greater than 100 kHz. Both the dielectric storage and loss increased substantially with DND content. Surface functionalization (with the above benzoic acid derivative) significantly reduced the dielectric loss, while the use of acetone-washed DNDs had no effect on the dielectric loss. DND was also blended with CP2 via in-situ polymerization and found to have little effect on the dielectric properties.
Surface-Modification of Sulfur Nanoparticles with Surfactants and Application in Agriculture
Authors: Turganbay Seithzan , Aidarova S.B. , Bekturganova N.E. , Alimbekova G.K. , Musabekov K.B. , Kumargalieva Saltanat S.
Published: September 2013

This work presents the results of obtaining the sulfur nanoparticles, which can be used in agriculture as a fungicide. Sulfur nanoparticles were obtained by modifying the surface of sulfur using various surfactants including cetyltriammoniumbromide (CTAB), sodium dodecylbenzene sulfanate (SDBS) and Triton X-100 (TX-100). The size, crystal structure and morphology of sulfur nanoparticles were determined by methods as laser size analyzing (LSA), X-ray diffraction (XRD), scanning electron microscope (SEM). It was found that the nanoparticles had a sulfur monoclinic β-form struture, and their average size was in the range of 1000-1500 nm.
Study on Preparation of Polishing Powder for LCD
Authors: Wang Xi Long , Yi Shou Zhi , Liang En Wu , Wu Yuan Yuan , Fang Zhong Xin
Published: September 2013

Polishing powder based on CeO2 is synthesized by a neutral precipitation method under the action of an additive, with Ce2(CO3)3 as starting material and NH4HCO3 as the precipitant. The size distribution of CeO2 particles is narrow-ranged and their morphology show a shape of polyhedral globules. They have a satisfied dispersion in water. The optimum characteristics are obtained under the conditions of followings: the mass ratio of F (in H2SiF6 ) to CeO2 7%, the molar concentration of additive A4 0.85mol/L, calcined at 850°C for 2 hours.
Fabrication of Fluorescent Polymer Crossbar Arrays and Microropes via Centrifugal Electrospinning
Authors: Liu Shu Liang , Sun Bin , Yin Hong Xing , Zhang Zhi Hua , Tang Cheng Chun , Long Yun Ze , Han Yu Mei
Published: September 2013

Fluorescent crossbar arrays and microropes of fluorescein/PMMA and rhodamine B/PS composite nanofibers have been fabricated via centrifugal electrospinning, respectively. The morphology and structures were measured by SEM and fluorescence microscope. The two as-spun fluorescent structures have potential applications in fluorescent security, fluorescent detection, and so on. By regulating the number of the nanofibers consisted in the microropes, the fluorescence intensity of the microropes can be manipulated, as well as the mechanical property of individual nanofibers, which can be calculated easily by testing that of the whole microrope.
Mechanical Properties and Microstructure of PMMA-ZrO2 Nanocomposites for Dental CAD/CAM
Authors: Li Shi Bao , Zhao Yi Min , Zhang Jian Feng , Xie Cheng , Li Dong Mei , Tang Li Hui , Zhao Xin Yi
Published: September 2013

A novel PMMA-ZrO2 composite (PZC) was prepared by resin infiltrated to ceramic method. The composite mechanical properties were evaluated and correlated to its microstructure. Partially sintered zirconia ceramics (PSZC) were made by isostatic pressing and partially sintering. Subsequently, the PZC was prepared by vacuum infiltrating prepolymerized MMA into PSZC, followed by in-situ polymerization. When PSZC-70% was used as the matrix, the bending strength, elastic modulus, and fracture toughness of the prepared composite i.e PZC-70% were 202.56±12.09 MPa, 58.71±3.98 GPa, and 4.60±0.26 MPa·m1/2, corresponding to 25.69%, 23.31%, and 169.01% improvement, respectively, in comparison with the control matrix. Among them, the fracture toughness improvement was the most prominent. According to SEM images of the fracture surfaces, each pore of zirconia skeleton was filled by organic resin contributing to the bending strength improvement. These weak interfaces between zirconia skeleton and organic resin absorbed energy and terminated the growth of microcracks which might be responsible for significant improvement in fracture toughness. This PZC material is anticipated to be a new member of the dental CAD/CAM family.