bluuebunny/crossref_metadata_2025 huggingface dataset:
Development of Hot Rolled Ship Plate with High Strength and High Toughness
Authors: Huo Xiang Dong , Guo Lin , Feng Jin Song , Luo Chao , Qu Jun
Published: May 2013

A new hot-rolled ship plate with high strength and high toughness is successfully developed through chemical composition design and TMCP process. Experimental methods, such as OM, TEM and X-EDS, were used to study the microstructure and precipitates of steel. The primary microstructural constituent is acicular ferrite, quasi-polygonal ferrite with second constituents along grain boundaries. Lath width of acicular ferrite is about 1μm. Cubic particles about several hundreds nanometers and nanometer particles exist in experimental steel. It can be concluded that acicular ferrite is the main reason for high strength and super toughness. precipitation hardening due to dispersed precipitations of carbonitrides can not be overlooked.
Characterization of some Key Industrial Waste Products for Sustainable Concrete Production
Authors: Hassan I. O. , Ismail Mohammad , Noruzman Ainul Haezah , Yusuf Taliat Ola , Mehmannavaz Taha , Usman Jamilu
Published: May 2013

The use of environmentally friendly or green concrete to enable worldwide infrastructural development without increase in carbon dioxide (CO2) emission is at the focal point of the global issues concerning sustainability. Aside from the concerted efforts by the key players in the construction industry to successfully replace in part or in whole, the conventional Portland cement with green or eco-friendly cementitious materials, the challenges of ensuring that the so called green or eco-friendly concrete performs up to the required expectation has been the focus of many researches. This study therefore, provides an overview of the various processing techniques for the industrial waste materials as well as the determination of the physical and chemical characteristics of the powders prepared from the respective waste materials. The materials were characterized using BET surface area analysis, X-ray diffraction (XRD), Chemical analysis by X-ray fluorescence (XRF), 45-μm wet sieving, 75-μm and 150-μm dry sieving, Specific gravity using density bottle and reactivity index (RI). The results show that FA and PBC are very similar in terms of their physical and chemical characteristic in comparism with POFA. Notwithstanding, all the materials satisfy the basic requirements of the relevant ASTM specifications and also falls within the limit specified by ASTM C 618 for class F fly ash.
A Study on Wellsite Wastewater Reinjection Stratigraphic Control in Changqing Oilfield
Authors: Chen Rong , Lei Zhi Wei , He Dong , Jin Peng Kang
Published: May 2013

Long Dong oil field located in the arid and semi-arid climate environment,as the oil extraction has been lasting for a long period,large amount of wellsite wastewater is produced without proper treatment and stored at the wellsite on long-term basis,which endangered the oil field environment.Focusing on the characteristic of Long Dong wellsite wastewater,conducting the experimental evaluation on treated wellsite wastewater reinjection based on the scaling prediction method,photo-extinction method and scale mass analysis.The evaluation process is standardized by scaling prediction,photo-extinction analysis and scale mass, meanwhile the removal effect of the key controlling factors like the medium particle size and SS of the treated water is detected as the research result shows.Wellsite wastewater treated by coagulation and filtration then supported by the advanced oxidation and membrane separation technology to intensify the size of tiny particles in wastewater.After the above process,the outflow may meet the "Recommended Clastic Rock Reservoir Water Injection Water Quality Index and Analysis Method "(SY/T5329-94 A1 standard) with good compatibility,and its ratio of treated water and reservoir water is 6:4 or8:2
Effect of Rare Earth on Microstructure and Mechanical Property of Ferrite Stainless Steel
Authors: Liu Xiao , Dong Hong Wang
Published: May 2013

The effect of rare earth element on structure and mechanical properties of the 430 ferrite stainless steel was studied by metallographic examination, scanning electron microscope (SEM), tensile test and impact test. The results show that the proper amount of RE can refine microstructure of 430 ferrite stainless steel. The fracture mode of 430 ferrite stainless steel is typical dimple fracture. 430 ferrite stainless steel containing 0.056% RE can improve its impact toughness and the high temperature strength, and the transverse impact toughness increases 37.2% at 253K respectively comparing with that of 430 ferrite stainless steel without RE. And at 1273K, the high temperature strength increases by 38.3% than that of 430 ferrite stainless steel without RE.
Study on Factors and Operation of Granulation Method for Strontium Removal
Authors: Luo Xin , Shi Meng Wei , Yin Hong Can
Published: May 2013

In this paper, the method of orthogonal experiment was adopted to investigate the influence of seed dosage, stirring time, calcium concentration and sodium carbonate dosage on strontium removal in granulation method. And continuous operation was studied. The order of influence factor was stirring time> seed dosage> sodium carbonate dosage amount> calcium concentration. In the operation experiment, the strontium and calcium removal efficiencies were both more than 90%, while the magnesium removal was less than 5%. The precipitate particles formed gradually became larger.
Purification Effect of Self-Aeration Constructed Wetlands on COD
Authors: Xia Hong Xia , Zhu Qi Hong
Published: May 2013

Aimed at the issue of dissolved oxygen concentration insufficiency in regular constructed wetlands, shale hollow bricks are adopted to build self-aeration constructed wetlands, to increase the oxygen supply capacity in the system. The experimental result indicates that DO concentration in self-aeration constructed wetlands is 0.1mg/L higher than that in artificially intensified aeration wetlands, and the removal rate for COD reaches over 85%,which is about 2% higher than that of artificial aeration wetlands. This shows that the built self-aeration constructed wetland system can increase oxygen supply capacity in the wetland, and increase the purification efficiency of the wetland system for COD in wastewater.
Selection of Substrate Diameter and Filling Thickness for Artificial Wetland
Authors: Xia Hong Xia , Zhu Qi Hong
Published: May 2013

As a significant part in artificial wetland system, wetland substrate is an important hub for the transformation of organic pollutants to inorganic and innoxious substance. In this thesis, with shale and quadratic-regression orthogonal rotation combination design, the diameter and filing thickness of artificial wetland substrate were optimized, and the orthogonal regression model for the P-removal rate in sewage (Y), diameter (x1) and thickness (x2) was established for wetland substrate, namely Y=77.06250-4.69914X1+3.43848X2-2.31875X12+4.38125X22-2.25000X1X2, It can be deducted from this model that the best experiment condition is that, the diameter is 10.94mm, while the filling thickness is 100.45. Under such condition, it can be inferred that the P-removal rate can reach 93.07% according to the mathematic model. It is testified that the experiment results are similar to the model values.
Enzymolysis Optimization of Walnut Residue Protein Using Trypsase
Authors: Zhang Shao Ying , Ren Yin Zhe
Published: May 2013

The enzymolysis of walnut residue protein was investigated using trypsase, and the best process conditions were studied by one-factor experiment and orthogonal experiment. The result showed that the influential degree weakened as follows sequence: temperature, pH, enzyme quantity, and time. The optimum conditions were temperature 53 °C, pH 8.3, enzyme quantity 0.85%, and time 2.5 h. The enzymolysis liquid obtained was thickly fragrant, nigger-brown, and not bitter. Its ammonia-nitrogen content was 6.98 g/100 g, and hydrolysis degree was 15.76%.
Kinetics Study of Vitamin A Precursor Synthesis by Immobilized Lipase-Catalyzed Regioselective Monoacetylation in n-Hexane
Authors: Jing Ke Ju , Duan Ran , Sun Jin Peng , Wang Shi Zhen , Lu Ying Hua
Published: May 2013

Vitamin A is an essential nutrient element in animal and human growth, which is usually produced by partially acetylating and transforming retinyl diol. The lipase-catalyzed mono-acetylation can obtain pure monoacetate compared with the classical chemistry process. In the current work, the synthesis of vitamin A precursor of Candida antarctica lipase B catalyzed by regioselective monoacetylation of primary hydroxyl of diol in n-hexane was studied. The reaction rate could be described in terms of the Michaelis-Menten equation with a Ping-Pong Bi-Bi mechanism and competitive inhibition by both substrates. A kinetic model was developed, and the apparent kinetic parameters were calculated as: Vmax =8.45 mmol/ (L•h); K m, vinyl =0.997 mmol/L; K m, diol =161.28 mmol/L; K i, diol =287.32 mmol/L; K i, monoacetate=18.13 mmol/L; and K I, diol =427.40 mmol/L. The current study indicates a competitive enzyme inhibition of highly concentrated diol during lipase-catalyzed acetylation reaction. When the diol concentration in the medium was low, there was a good conformity between the experimental and simulated values with 4.73% average relative error.
Numerical Simulation of Cell Growth Pattern and Determination of Fractal Dimension of Cell Cluster
Authors: Wang Ji Zhe , Guan Qing Jie
Published: May 2013

Life system behaves self-similar properties from microcosms to macrostructure. Based on the cell growth roles, the cell cluster growth process is simulated. The sandbox method and box counting are used for determining the fractal dimension of cell associated with the geometrical structure of growing deterministic fractals. The fractal dimension of cell shape is estimated according to the slope of line between the numbers of boxes and box size in double logarithm coordinates.
Preparation and Characteristics of Chitin-Gelatin Composite Film
Authors: Wang Ya Juan , Jiang Lan , Shao Shuang Xi
Published: May 2013

Using hydrogen peroxide as oxidant, the chitin has been oxidized under a certain conditions. And then the IR and SEM of product has been tested, and the results show that hydroxyl group can be transform carbonyl group. What’s more, the oxidation reaction occurred not only in the surface of chitin, but also in its interior. Owing to the reaction of carbonyl group in the oxidation product, this chitin derivatives was applied to cross link with gelatin material, and the properties of modified gelatin film then has been tested. The results of Differential Scanning Calorimeter (DSC) show that the denaturation temperature of composite gelatin film has been enhanced to 109.8°C, and its swelling rate also has been slow, which ensure the stability as a kind of biomaterials, such as microcapsule and microspheres. And the time of native gelatin film achieving equilibrium swelling state is 9 minutes, and the time is 14 minutes for composite film, which means the oxidized chitin can delay the complete swelling rate. And the equilibrium swelling ratio of native gelatin film is larger than that of composite film. Therefore, the composite film will have a good prospects as a kind of potential biomedical.
Prokaryotic Expression and Purification of Tomato Cnr Protein
Authors: Xie Yuan Hong , Liu Hui , Zhang Hong Xing
Published: May 2013

Tomato fruit ripening mutant colorless non-ripening (Cnr) is an autosomal dominant mutant, obtained by natural mutation. The fruit of Cnr mutant was obviously immature, and the softening and lycopene accumulation of the Cnr fruit was significantly inhibited during the fruit ripening. In this work, we cloned the Cnr gene from the red ripe tomato fruit by RT-PCR, and constructed a prokaryotic expression vector. And the recombinant Cnr protein was induced by 1 mM IPTG in Escherichia coli BL21 (DE3), and purified by MBP affinity chromatography.
Protein Extraction of the Long-Term Room Temperature Storage Wheat Straw
Authors: Zhang Tao , Wang Lian Jie , Chen Hui
Published: May 2013

Study on extract protein from long-term room temperature storage of wheat straw,utilize L9(34) Orthogonal experiment on the basis of single factor test.Study the impact of extraction time,extraction temperature and solid-liquid ratio on protein extraction yield of wheat straw.Result show factors affect wheat straw protein extraction rate in the order of extraction time>extraction temperature>liquid ratio>blank test,the optimal conditions is 50°C, the solid-liquid ratio 1:20 extract for 12 hours.Measured extraction yield is 21.761%.
Studies on Charcoal Block Production from Three Charcoal Types of Biomass Employing Screw Press Unit
Authors: Laloon Kittipong , Sudajan Somposh , Junsiri Chaiyan
Published: May 2013

The objective of this research was to study and develop bio-charcoal from agricultural wastes. The prototype machine consisted of a mixing tank, a screw conveyor, a hopper, a screw pressing unit, a transmission unit and a main frame. Three types of charcoal powder (cassava stump coal, assorted wood coal and coconut-shell coal) and three screw pressing speeds (115, 130 and 145 rpm) were studied. The experimental results indicated that the prototype gave the best combination of using a feed rate of 140 kg/h, screw pressing speed of 145 rpm and a mixing ratio by weight of assorted wood coal: coconut-shell coal: cassava starch: water content of 0.5: 0.5: 0.15: 1. The machine had a working capacity of 131.5 kg/h, specific energy consumption of 16.16 W-h/kg, bulk density of 676.0 kg/m3, compressive strength of 0.235 MPa, heating value of 5527.3 cal/g and utilization efficiency of 27.79-29.56 %. The charcoal block length, outer diameter and inner diameter were 15.01±1.62 cm, 4.12±0.05 cm and 1.23±0.12 cm respectively at an average moisture content of 7.31 % (db.).
The Assessment of Sweet Sorghum Straw Bio-Feed Fermentated by the Compound Microbial Agent in Bags and Cellar Pits
Authors: Wang Shu Yang , Xiao Guo Qing , Li Wen Jiang , Chen Ji Hong , Liang Jian Ping , Liu Jing , Zhang Xiang Yang , Su Hong , Jiang Bai Ling
Published: May 2013

The results indicated that the sweet sorghum straw bio-feed fermented in bags and cellar pits by the Compound Microbial Agent both could increase the content of the crude protein (CP) and reduce the content of the fibrinogen (FIB) compared with control group. The content of CP in bags fermented by Complex Microbial group has increased 71% and the content of FIB has reduced 8%. The CP content of cellar pits fermented by Complex Microbial group has increased 91% and the FIB content has reduced 24.5% . Compared with Silage corn stalks group , sweet sorghum straw bio-feed fermented by the Compound Microbial Agent could also improve the content of milk protein (14.03%,16.81%) and butterfat rate (16.3%, 92.98%) and reduce the somatic cell's number (5.15%,6.86%) in the milk. It has promoted the cows capacity to produce milk and also improved the quality and flavor of dairy product.
Flame Retardation of Wood
Authors: Osvaldová Linda Makovická , Osvald Anton
Published: May 2013

The paper presents the characteristics of fire-wood, the combustion process and the degradation of wood and also conducts an assessment non-retarded and retarded beech veneer testing reaction to fire according to EN ISO 11925-2 and its methodology. The main contribution is to highlight the importance of fire retardants in view of the fire properties of materials
Mechanisms and Defiberation Point of Dendrocalamus Giganteus Munro Kraft Pulping
Authors: Zhou Chen Bi , He Jie , Chen Yang , Gao Hong Yan
Published: May 2013

In this paper, mechanisms and defiberation point of Dendrocalamus Giganteus Munro kraft pulping were studied. The results showed that the delignification of kraft cooking could be divided into 3 stages: the bulk delignification stage, which was from the beginning of heating to 165°C for 30min, and its delignification rate was above 80%; the supplementary deligninfication stage, which was from 165°C for 30min to 90min, and about 11% of lignin was dissolved in this stage; the residual delignification stage, which was from 165°C for 90min to the end of cooking, and about 1% of lignin was dissolved in this stage. And the defiberation point during kraft cooking was at 165°C for 60min nearby.
Optimization of The-Hydrolysis Parameters of Dissolving Pulp of Fast-Growing Poplar Producing
Authors: Li Yin Bo , Yang Gui Hua , Chen Jia Chuan
Published: May 2013

As textile industrial and glass paper-making materials, dissolving pulps are scarce in China and a great deal of dissolving pulps are imported in the recent years. Currently different fiber materials are tried to produce dissolving pulp in China. In this research work the hydrolysis parameters of the fast-growing poplar based dissolving pulp producing were investigated .And the chemical composition of pulp after hydrolysis were also analyzed, the experimental results showed that the optimal hydrolysis conditions were acid dosage in the range from 0.015% to 0.035%, wood-to-liquor ratio 1:6.5, and the temperature 130 °C. The pentosan content of the pulp after hydrolysis in this hydrolysis conditions was in range of 0.62%-23.16%, which decreased by 23.01%. And the cellulose content slightly changed.
Preparing Gambiered Guangdong Silk with Ultraviolet Radiation and Normal Mud/Fe2+
Authors: Chen Cheng , Ji Xi Min , Zhang Guang Xian , Zhang Feng Xiu , Zheng Hui
Published: May 2013

in order that Gambiered Guangdong Silk can be made in normal area with modern technology, the ultraviolet radiation light was instead of sunlight, normal mud/Fe2+ was instead of Pearl River mud. The Gambiered Guangdong Silk was prepared by ultraviolet radiation light and normal mud/Fe2+. The result showed that ultraviolet radiation light and normal mud/Fe2+ could produce Gambiered Guangdong Silk. The color of silk fabric made by ultraviolet radiation light and normal mud/Fe2+ was almost same as that of silk fabric made by sunlight and Pearl River mud. The thickness of silk fabric made by ultraviolet radiation light and normal mud/Fe2+was approximate to that of ilk fabric made by sunlight and Pearl River mud. These means the Gambiered Guangdong Silk can be made in normal area.
Research on the Antioxidation of Torreya Grandis Alcohol Extracts in Cholesterol-Fed Rats
Authors: Fang Qin , Jin Sheng Lang
Published: May 2013

The antioxidant enzymatic activities of Torreya grandis alcohol extracts (TAE) in cholesterol-fed rats and an index of lipid peroxidation had been identified In the TAE groups, compared with the control group, significant decreases were observed in superoxide dismutase (SOD) activity in the livers and kidneys, catalase (CAT) activity in the kidneys, and glutathione peroxidase (GSH-Px) activity in the liver and kidneys. Besides, significant decreases were observed in the quantities of thiobarbituric acid reactive substances (TBARS) in the liver and kidneys of the TAE groups.
Study on Furfural Production from Hemicelluloses
Authors: Shen Bin , Liu Yan Xue , Liu Yu Xin , Peng Jin Hui
Published: May 2013

In this paper, furfural was produced from hemicelluloses of bagass by hydrolization reaction with sulfuric acid and acetic acid respectively. The effect of several variables such as temperature , liquid-to-solid ratio ,time and catalyst charge（KCL） on furfural yield was studied. The results showed that the better yield of furfural was obtained in acetic acid hydrolysis system. However, compared to yield of acetic acid hydrolysis system, it need more time and higher temperature at the same liquid-to-solid ratio. At last, when sulfuric acid as catalyst, liquid-to-solid ratio was 1:6 and time was 5h at 150°C, furfural yield can reach 75 %.
Microstructure Evolution and Grain Boundary Characteristics of Oriented Silicon Steel during Primary Recrystallization in a Pulsed Magnetic Field
Authors: Liu Li Hua , Li Li Juan , Zhai Qi Jie
Published: May 2013

The effects of a 2 T pulsed magnetic field primary annealing process on microstructure evolution and grain boundary characteristics in two-stage cold-rolled silicon steel were examined. Pulsed magnetic annealing increased grain size through the application of relatively smaller intensity of magnetic fields (2 T), compared to steady magnetic annealing. The effect of increasing grain size may be attributed to the magnetic acceleration effect of boundary motion under magnetic pulse conditions. Pulsed magnetic annealing may serve to enhance the relative intensity of the {111} component and decrease the frequency of low-angle misorientations. Repeated magnetostriction induced by pulsed magnetic field applications may accelerate overall dislocation motion. These findings suggest that pulsed magnetic fields require relatively lower intensities than steady magnetic fields to achieve superior results, providing a potentially viable alternative for industrial annealing processes for electrical steels.
Study on Extraction of Wasabi Plant Material Bio-Activity Substances and Anti-Cancer Activities
Authors: Hu Shang Qin , Wei Wei
Published: May 2013

The isothiocyanates were isolated from different organize of wasabi with extraction and distillation methods for the development of its’ medical value. An experiment of isothiocyanates anti-cancer cells of the liver was designed. The results showed that the contents of the isothiocyanates were 0.53 mg ml-1in the root, 0.80 mg ml-1in the stem, and 0.27 mg ml-1in the leaf of the wasabi, respectively. Allyl isothiocyanate (AITC) and (2-isothiocyanatoethyl)-benzene were the major volatile compounds of wasabi stem. The wasabi distillate inhibited the liver cancer cells and caused the death of liver cancer cells in 90 min treatment. The results of this study provided a scientific basis for the anti-cancer medical value and isolation of isothiocyanates from wasabi.
The Influence on the Milk Yield and Milk Composition of the Cows after Feeding with the Sweet Sorghum Straw Fermented by the Compound Microbial Agent in Bags
Authors: Wang Shu Yang , Zhang Xiang Yang , Su Hong , Xiao Guo Qing , Li Wen Jiang , Lian Jian Ping , Chen Ji Hong , Liu Jing , Jiang Bai Ling
Published: May 2013

The objective of this study was to research the influence of the sweet sorghum straw fermented by the Compound Microbial Agent on the milk yield and milk composition of the cows. The results indicated that sweet sorghum straw bio-feed fermented by the Compound Microbial Agent in bags could increase the feed intake (11.4%) and milk yield(14.2%) compared with the control group, it also has improved milk protein (14.03%) and butterfat rate (16.3%) ,and has reduced the somatic cell's number(5.15%) compared with the control group. The sweet sorghum straw fermented by the Compound Microbial Agent has reduced the milk-feed ratio (20.8%).It has improved the feed digestibility and utilization and reduced the costing.
Influence of Surface Zeta Potential on Adhesion of Chlorella sp. to Substratum Surfaces
Authors: Zhang Xin Ru , Jiang Ze Yi , Yuan Hao , Lu Yuan Xiang , Chen Liang , Chou Ai Hui , Yan Hai , Zhang Xin Xin
Published: May 2013

Microalgae, in wet conditions, tend to grow on surfaces and form biofilms. The adhesion of microalgae to surfaces is very important for algal mass culture. The formation and development of microalgal biofims are in large denpend on the properties of cell surface, substratum surface and gowth medium. In this paper, the influence of substratum surface zeta potential on the microalgal biofilms was particularly investigated. We focused on a widely-used microalgal strain, the freshwater autotrophicChlorella sp..The adhesion phenomena ofChlorella sp.to surfaces with different zeta potential were observed microscopically. It was found thatChlorella sp.adhered easily to the surface with a positive zeta potential and difficultly to the surface with a negative zeta potential. We concluded that the surface zeta potential had a greater influence on the adhesion of microalgal cells to substratum surfaces. Our findings have important implications for microalgae mass culture and harvesting.
High-Consistency Electrochemical Delignification of Poplar Kraft Pulp
Authors: Zhong Ya Jie , Kong Fan Gong , Wang Shou Juan , Zhan Huai Yu , Wang Wen Bo
Published: May 2013

The electrochemically mediated delignification of pulp fibers is one of the promising bleaching methods, which can give the delignified pulp with good subsequent bleachability and high pulp viscosity. Our previous work has shown that the poplar kraft pulp can be delignified to 45% delignification ratio with less than 10% pulp viscosity loss at the condition of 1% pulp consistency which limits the application of this method in pulp industry. The high-consistency electrochemical delignification of poplar kraft pulp was investigated in this paper. The delignification ratio, pulp viscosity loss and brightness were measured as well as the delignification conditions, such as pulp consistency, voltage of electrolysis cell, temperature, circulation of electrolysis liquor and time, were discussed. The results showed that at the 10% pulp consistency, the circulation of electrolysis liquor between pulp cell and electrolysis cell can efficiently improve the delignification ratio, and the pulp viscosity loss is less than 10%. The subsequent bleachability for H2O2 is similar as that of 1% consistency delignified pulp. The pulp also can be bleached to higher than 80% ISO with following EP stage at 2.5% H2O2 dosage.
Using of Magnesium Hydroxide and Sodium Hydroxide in DP Beaching of NaOH-AQ Wheat Straw Pulp
Authors: Wang Wen Bo , Kong Fan Gong , Wang Shou Juan , Zhong Ya Jie , Yang Gui Hua
Published: May 2013

Sodium hydroxide (NaOH) substituted by magnesium hydroxide (Mg(OH)2) as control agent and alkali source were investigated in chlorine dioxide bleaching and hydrogen peroxide bleaching of NaOH-AQ wheat straw pulp. The effects of alkali sources on pulp properties, including brightness and tensile strength, were investigated. The four experimental groups, including DNaOHPNaOH, DNaOHPMg(OH)2, D Mg(OH)2PNaOH and DMg(OH)2PMg(OH)2, were studied in this paper. The results showed that the brightness and tensile strength of DMg(OH)2PMg(OH)2 pulp was slightly lower than that of DNaOHPNaOH pulp. But there were more residual ClO2 and residual H2O2 in the effluents of DMg(OH)2PMg(OH)2 bleaching process than that in the effluents of DNaOHPNaOH bleaching process, which illustrated that DMg(OH)2PMg(OH)2 bleaching process had higher bleaching efficiency than DNaOHPNaOH bleaching process. The influence of Mg(OH)2 replacing NaOH was more obvious when it was used in the bleaching process of P stage than that in the D stage. The replacement of NaOH with Mg(OH)2 in D Stage can lower the dosage of alkali used in the following P stage.
Biocompatibility Research of the Biphasic Calcium Phosphate Composite Ceramic Film Obtained through Micro-Arc Oxidation on the Medical Titanium Surfaces
Authors: Dong Shu Jing , Bao Jun Hua , Sun Shu Juan
Published: May 2013

To obtain optimal medical ceramic film with bioactivity, Microarc oxidized TiO2-based films containing Ca and P on titanium alloy were formed in electrolytes containing hydroxyapatite and β-tricalcium phosphate salts. After that the biocompatibility tests including invitro soaking test and invivo implant experiment were carried out, and component and phases of films were analysed by energy dispersive spectrometer and X-ray diffraction, respectively.The obtained result shows the porosity biomedical ceramic films with different proportional of Hydroxyapatite/β-tricalcium are fabricated through changing the electrolyte composions,respectively.The bioactivity of biphasic calcium phosphate is enhanced comparing to the pure HA ones.So the biphasic calcium phosphate film material can be satified with medical application.
Preparation and Characterization of Alkylethoxyethanesulfonate in Superbasic System KOH-DMSO
Authors: Niu Rui Xia , Song Hua , Sun Shuang Bo , Ren Wei Dong
Published: May 2013

Alkylethoxyethanesulfonate is one kind of nonionic-anionic surfactant with a polyglycol ether chain and a sulfonic group at the end of the chain. It was synthesized in a new method by using fatty alcohol-polyoxyethylene ether MOA-3, thionyl chloride and sodium isethionate as raw materials, and then the intermediate chloridepolyglycol ether MOACl-3 reacted with sodium isethionate in a superbasic system KOH-DMSO.The structures of MOA-3,MOACl-3 and alkylethoxyethanesulfonate MOASO-3 were confirmed by their IR spectrums, and the saltresistance of MOASO-3 was studied. IR analysis results indicate the intermediate and product all have the same structure with the aim compound. The saltresistance results show that MOASO-3 is compatible with NaCl aqueous solutions, when the concentration of MOASO-3 is 0.2wt%, the surfactant-water solutions were clear and transparent up 0.6wt% NaCl.
Experimental Study of Optimal Coagulation Effect on Three Kinds of Direct Sun-Proof Dyes by FeCl3
Authors: Tian Yu Ping , Wang Bo
Published: May 2013

This experiment was a study about the treatment of simulated dyestuff wastewater by coagulant of FeCl3. The removal rates of turbidity and color were investigated by changing the dosages of the coagulant for dye wastewater. The experiment results showed when the concentration of FeCl3was 2g/L, the optimum dosages of FeCl3were 9,6 and 8mL for three kinds of simulated dye wastewater of direct sun-proof light green, yellow and scarlet. Under these conditions, the removal rates of turbidity were 86.2%, 83.6% and 93.4%, and the removal rates of color were 82.7%, 61.4% and 79.0%.
Kinetic of C.I. Reactive Black 5 by Fenton-Like Oxidation
Authors: Du Yi Jun , Jiang Guo Peng , Fang Xin Ping , Qiu Mu Qing
Published: May 2013

The decolorization kinetic of C.I. Reactive Black 5 was studied using Fenton-like oxidation. The effect of the major system parameters, such as initial pH of the solution, concentration of H2O2, concentration of Fe3+ and reaction temperature on the kinetics was determined. The results indicate that the operating parameters, such as initial pH of dye solution, initial concentration of Fe2+ and H2O2, reaction temperature, have strong influences on the degradation of C.I. Reactive Black 5 by Fenton-like oxidation process. In addition, it was also found that the decolorization of C.I. Reactive Black 5 followed the first-order kinetics well.
Preparation of Strontium-Barium Hydroxyapatite by Coprecipitation
Authors: Shi He Bin , Tian Xing , Zhong Hong , Liu Yu , Wan Ting
Published: May 2013

This paper reports a novel coprecipitation process for the preparation of strontium-barium hydroxyapatite [Sr5-xBax(PO4)3OH]. Strontium nitrate, barium nitrate and phosphoric acid were dissolved in water to form a homogeneous Sr-Ba-P aqueous solution. The samples were characterized by powder X ray diffraction, Fourier transformed infrared spectroscopy and scanning electron microscopy. The results showed that the barium phosphate [Ba3(PO4)2] phase appeared at the samples prepared at the pH value lower than 12. A series of Sr5-xBax(PO4)3OH samples had beenobtained by adding sodium hydroxide aqueous solution into the Sr-Ba-P solution to pH12.5 and following aging at 60 °C for 24h. The so-prepared samples are metallic cation-deficient hydroxyapatite solid solutions. The samples present low degree of crystallinity, irregular short rod-like morphology and nanometer size. The crystal cell parameters of Ca5-xSrx(PO4)3OH samples are nearly linear to their barium content, and their infrared absorption bands of PO43- groups shift to lower wave numbers with the increase of the barium content.
Study on the Reaction Kinetics and Catalytic Stability of Pillared Bentonite in Heterogeneous UV-Fenton Process
Authors: Zhang Xuan , Jiang Hong Lei , Chen Xia
Published: May 2013

An investigate was carried out to evaluate the catalytic performance of Fe, Al-pillared bentonite in heterogeneous UV-Fenton process. The catalysts were prepared by a cation doping technique. X-ray diffiraction and infraed spectroscopy were used to characterize their properties. Results showed that intercalated process could obtained larger interlayer spacing. Some bands of infrared spectroscopy shifted to lower wave length, indicating that FexAly has intercalated into the layers of the bentonite. The higher ratio of Fe to Al was in the pillaring solution, the higher discolouration rate could be obtained. The discoloration rate reached 79.9% at 20 min and 283K when the ratio of Fe to Al in pillaring solution was 9:1. The reaction constants of the heterogeneous UV-Fenton process increased from 0.074 min-1 at 283K to 0.094min-1 at 323K. Its activation energy was 36.7kJ.mol-1, indicating that temperature had little effect on this process. Little Fe-leaching made it possible for Fe, Al-pillared bentonite to remain a high stability during recycling uses.
The Characteristics of Trace Metal Elements Accumulation and Distribution in Elsholtzia Harchowensis
Authors: Xiong Shui Xiong , Xie Wei Yi , Huang Cheng Cai , Qiu Mu Qing
Published: May 2013

In this paper, the characteristics o f trace metal elements were studied in Elsholtzia harchowensis. The relation of trace elements between plant and soil was studied, and the copper tolerance and mechanism of the plant was discussed in details. The results showed that the trace element contents of the soil was higher, Cu content was highest in these elements, and it was as more 200 times as that of control sites. Cu in the plant was highest in these elements and Cd was lowest. The elements sequence in plant was: Cu> Mn> Zn> Pb> Cd. Element contents in different parts of the plant were: Cu, root> flower> leaf> stem; Cd, leaf> flower> root> stem; Mn, leaf> root > flower> stem; Zn, leaf> flower> stem> root; Pb, root> leaf> stem> flower. There is positive correlation in Cu between plant and soil. The tolerance capacity is higher in the plant.
Adhesion Loss in Antistripping Agent Treated Asphalt Binders due to Moisture
Authors: Arifuzzaman Md , Tarefder Rafiqul A.
Published: May 2013

This study evaluates the role of antistripping agents to resist moisture-induced damage in asphalt binders. A total of five different types of antistripping agents are used. Plastomer and elastomer modified asphalt binders are used to modify the original base binder. Functionalized and non-functionalized AFM tips are used to determine adhesion in asphalt. With-CH3 tip, lime is found to be the most effective to protect moisture damage in asphalt binder as the adhesion loss is almost zero. The statistical tests show the Pearson values are very close to-1 that indicates a good correlation among the variables. Also the p-values are well below the prescribed value of 0.2% that indicates the test results to be significant from the statistical point of view.
The Studies on Crystallization of Polypropylene (PP)/Nano-TiO2 Composites under Microwave Irradiation
Authors: Liu Chang Gui , Wu Yu Jiao , Yang Chun Ping
Published: May 2013

The surface-features of PP/nano-TiO2masterbatch before and after microwave irradiation were investigated by FT-IR, and then PP/nano-TiO2composites were prepared through secondary melt extrusion. The mechanical properties and crystallization behaviors of PP/nano-TiO2 composites before and after microwave irradiation were studied by mechanical property tests, Scanning Electron Microscope (SEM), differential scanning calorimetry (DSC) and polar optical microscope (POM). The results showed that impact strength, tensile strength and flexural modulus of PP/nano-TiO2 composites were remained, but elongation at break increased by 100% after microwave irradiation because their tensile fracture modes changed, and their crystallization onset temperature and crystallization temperature decreased respectively by 2.26°C and 2.23°C but crystallinity increased by 20%, while crystallization rate remained and the size of PP spherulites became bigger obviously.
The Surface Modification and Characteristics of Useful Expanded PTFE Composites by Photo-Radiation Methods
Authors: Wu Te Hsing , Chen Ko Shao , Shen Lie Hang
Published: May 2013

In this study, We immobilized hydrogel material onto expanded polytetrafluoroethylene (ePTFE) film and used as an functional biomaterial. The material is a film containing titanium oxide onto polymer sheet. The hydrogel film is hydrophilic, bacterial inactivated and bio-compatible. In order to improve the ePTFE film biocompatibility, the cold plasma or γ-ray technology was used with acetic acid as monomer to deposit onto ePTFE film and then (N-isopropylacrylamide) was grafted onto the surface by radiation photo-grafting. The characteristics of the material surface were evaluated with X-ray photoelectron spectroscopy (XPS), FTIR and water contact angle. It was found that the contact angle of water on the untreated ePTFE significantly decrease from125° to 72° after ePTFE film being treated with acetic acid plasma deposition procedure. Due to the hydrophilicity of poly (N-isopropylacrylamide), so the contact angle of water on the ePTFE-g-NIPAAm almost approached to 0°. This thermal sensitive ePTFE hydrogels can be applied to artificial guiding tube and wound dressing material.
Synthesis of Poly(acrylic Acid Dodecyl Ester-Styrene-Maleic Anhydride) Terpolymer and Surface Modification of Glass Fiber
Authors: Wang Jing Chang , Liu Chun Ming , Zhao Qi Cheng , Dong Xu
Published: May 2013

Poly(acrylic acid dodecyl ester-styrene-maleic anhydride) terpolymer (LA-St-MA) is synthesized by free-radical solution polymerization and is used for surface modification of glass fiber. Terpolymer is characterized by Fourier transform-infrared spectroscopy (FT-IR) and gel permeation chromatography (GPC). Meanwhile, scanning electron microscopy (SEM) is adopted to observe surface properties of modified glass fiber. The results reveal synthetic terpolymer can be coated on glass fiber surface well and that modified glass fiber can be bonded well with polypropylene(PP).
Research on Molten Steel Flow with Electromagnetic Stirring
Authors: Zhang Jing
Published: May 2013

The method of numerical simulation and experiment were adopted to research the molten steel flow with electromagnetic stirring(EMS). Woods metal was used to simulate molten steel flow by changing electromagnetic parameters in laboratory.The results of numerical simulation was verified. The results showed that the velocity of round mold is larger than rectangle in same EMS conditions. In order to play a fully stirring ,the EMS current and frequencies shouldn't too high in round mold, but the current is as big as possible in rectangle mold.
Bending Ratcheting Behavior of Zircaloy-4 Alloy at Room Temperature
Authors: Guo Hong Qiang , Li Hua , Sun Yi Chen , Yu Wei Wei
Published: May 2013

In this paper, a series of bending cyclic tests under stress controlled were conducted at room temperature on Zircaloy-4 (Zr-4) to investigate its bending ratcheting behavior. The effects of mean stress and stress amplitude on the bending ratcheting behavior were experimentally studied, respectively. The experimental results show that the ratcheting strain of the material is very sensitive to mean stress and stress amplitude. It can be concluded that ratcheting strain level increases with increasing mean stress and stress amplitude.
Experimental Study on Fatigue Behavior of 35CrMo Steel after Torsional Prestrain
Authors: Wang Shi Yue , Wu Zhi Yu , Yang Xi Jie , Ren Zhao Ying
Published: May 2013

Low cycle and high cycle fatigue tests of 35CrMo steel at different pretorsional angles were conducted and cyclic hardening and softening curves, hysteresis loops and S-N curves were obtained of 35CrMo steel after the torsional prestrain. Scanning electron microscopy (SEM) analysis was also made of the fatigue fracture. The results show that: 35CrMo steel features obvious cyclic softening with basically the same law and degree at different torsional prestrains. The area surrounded by the stress-strain hysteresis loop decreases with the increment of the pretorsional angle; the torsional prestain reduces the fatigue life of the materials.
Improved Extend Finite Element Method for SIF Calculation
Authors: Lu Nian Li , Zhan Wei Gang
Published: May 2013

Fatigue is the most common failure mechanisms in many engineering structures with inherent defects under variable amplitude loading, Such as lifting structures, airplanes, bridges and so on have to endure for a long term cycle loadings in the actual service. For such structures, fatigue life is dominantly predicted by crack growth analysis, using the stress intensity factor range. In this paper, an improved extend finite element method is proposed for stress intensity factor calculation, which can overcome the limitation of the level set method in judge the element types. Numerical experiment is provided to demonstrate the utility and robustness of the proposed method.
Lateral Non-Uniformity Charges Influence on Interface Trap Density (Dit) by Terman Method in the nMOS Fabrication
Authors: Chen Shen Li , Chang Yet Fan
Published: May 2013

Generally speaking, the oxide interface quality can be determined by the interface trap density (Dit) distribution. In this paper, the Dit quantity obtained from the Terman method, which it is assumed that the Dit is equal to zero at the beginning for simulating the Dit effect in ultra-thin oxide. However, the lateral non-uniformity charges have existed in the oxide layer, which maybe obtained an equivalent Dit density not equal to zero also producing an equivalent Dit value. And, such faked Dit will be resulted in an error in high frequency measurement. Fortunately, it can be solved by differentiating technique to obtain an accuracy Dit quantity.
Ablation/Erosion Test Technology on C/C Composite Material Based on Plasma
Authors: Zha Bai Lin , Huang Ding Yuan , Qiao Su Lei , Wang De Wen , He Wei , Zha Zhi Hong , Li Bin Xiang
Published: May 2013

C/C composite material is widely used as the insulation material since its advantage is obvious compared with other materials. It is necessary to evaluate its ablation, especially when it used in the warhead. An ablation/erosion test system based on plasma is researched. All the parameters related to the plasma can be monitored by it to calculate the enthalpy. Two ablation tests of the C/C composite material are carried by this system. The ablation of the carbon fiber and the erosion of the particle are mainly analyzed by the measure of the ablation rate and the SEM photos.
Application and Evaluation of New Cold Insulation Material in Cold Insulation Structure of Oil and Gas Processing Device
Authors: Wang Shu Wei , Lin Lin , Wu Guo Zhong
Published: May 2013

The cold loss is larger in oil and gas processing device with cold insulation structure of failture. The cold insulation effect of oil and gas processing device is evaluated and analised,that is great significative to decrease the energy loss on processing and transportation of oil and gas.In this paper, of oil and gas processing device which have the failure cold insulation structure is evaluated and transformed ,whose cold insulation effect is analyzed and compared between pre-and post transformation. The study results show that transformation of cold insulation structure of failture can lower the cold loss and electricity consumption; the economic benefit is best when the nitrile rubber material is used.
A New Experimental Technique for Dynamic Material Properties
Authors: Liang Min Zu , Li Xiang Yu , Lu Fang Yun , Qin Jin Gui
Published: May 2013

An improved experimental method has been described to determine dynamic material properties under conditions approximating uniform one-dimensional tensile loading. A lateral efficiency loading is produced when the projectile, which is made of low-density material, impacts high-intensity target. The lateral efficiency loading technique is a convenient and effective technique to study the dynamic fracture and fragmentation properties of materials under high strain rate tensile loading.
Analyzing Bearing Capacity Influence due to Location of Bearing Push-Extend Reamed of the Push-Extend Multi-under-Reamed Pile
Authors: Qian Yong Mei , Yu Han , Wang Ruo Zhu
Published: May 2013

Because the failure behavior of the soil surrounding the Push-extend Multi-under-reamed Pile will be affected by the placed location of the bearing push-extend reamed, further, the bearing capacity of the Pile is affected, in the paper, through experimental study and theoretical analysis, it is qualitatively analyzed that the influence of the location of the bearing push-extend reamed for the bearing capacity of the Push-extend Multi-under-reamed Pile, the achievements of the paper will present the well theoretical basis for synthetically considering all of affecting factors in the design of the Push-extend Multi-under-reamed Pile.
FEM Based Statics Analysis of the Main Steel Structure of Bucket Wheel Stacker-Reclaimer
Authors: Shang Peng , Zhou Wei , Li Chun Xia , Guan Yu Ming
Published: May 2013

Bucket wheel stacker-reclaimer is kind of a typical multi-rigid-body system. Its main steel structure consists of bucket wheel, forearm frame, column tower, balance frame and pull rod, etc. All components connected with each other basically by welding. And the integral structure can realize whole luffing motion and turning motion. Reclaiming arm, central bracket and pitch steel structure of counterweight arm are the structure of its core. This paper use ANSYS to create the simplified finite element model of the steel structure and analyze the distribution of loads in all types of conditions. Loading solving, then cloud picture of displacement and that of stress of the overall luffing mechanism was concluded, so as to check the carrying capacity and strength of the structure.
The Application of AAR Load Spectrums in the Fatige Assessment for G70 Tank Carbody
Authors: Qu Sheng , Wu Ping Bo , Liu Zhuan Hua
Published: May 2013

G70 Tank car uesd for transportation on liquidsliquids of gas and bulck goods in form of powder,is one of the major class of Chinese railroad freight cars.And the tank car makes about 18% of the toatal amount of freight cars. In this stduy, the carbdoy finite element model of tank car was constructed,and calculated stress of carbody both empty car and fully loaded car,then get the results of key postsitions. According to the AAR load spectrums on the part of the tank car,translated the results into dynamic stress through the quasi-static method. Calculated the damage of carbody with the fatigue analysis method provied in AAR, compared the fatigue life under various comonent.
The Mechanical Property Comparison of Two Kinds of Counterweight Booms of Stacker Reclaimer
Authors: Shang Peng , Qi Kai Cheng , Wang Ya Xu , Guan Yu Ming
Published: May 2013

This paper used the finite element method to compare the mechanical properties of two different configuration counterweight booms of the bucket wheel stacker reclaimer. And two different forms of the finite element analysis model of the counterweight booms were built in ANSYS. The stresses and strains under its working state were calculated. Then the impact of the counterweight arm to the force and stability of the whole rack could be analyzed. The results of this analysis provided a basis to select different types of the counterweight booms in different environment, and it has an important guidance and reference significance to the design and analysis of counterweight booms of large-scale machinery.
An Experimental Study of High-Velocity Impact on Aluminum Foam Composite Shield Structure
Authors: Li Qing Zhen , Du Zhong Hua , Wang Kang Kang
Published: May 2013

To study spacecraft shield structure against hypervelocity impact of space debris and its protective performances, 25mm ballistic gun launching 12.7mm cylindrical debris is selected against Aluminum foam composite structure at high speed. Based on the experimental results and analyze the effects of Aluminum foam protective structure with different combinations, the result is that protective effects with Aluminum foam in front of glass fiber is better.