bluuebunny/crossref_metadata_2025 huggingface dataset:
Research of Agricultural Information Management and Retrieval
Authors: Liang Jun Feng , Jin Chun , Zhang Lei , Liu Xu Ning
Published: July 2014

In order to improve the efficiency of agricultural information retrieval and provide the effect methods for the information retrieval of agricultural, the intelligent searching technology of agricultural information based on ontology is proposed. The paper firstly introduces the concept of ontology, analyzes the characters of agricultural knowledge, and constructs the related agricultural knowledge ontology and knowledge base, implementing the intelligent searching of the agricultural information. The results indicate that the research on agricultural ontology can contribute to organization and searching of agricultural scientific knowledge and provide methods for information organization and searching of agricultural knowledge.
Design, Synthesis and Anticancer Activity of 4-Morpholinothieno[3,2-D]-Pyrimidine Derivatives Bearing Chromone Moiety
Authors: Sun Cheng Yu , Chen Chen , Wu Chun Jiang , Zheng Peng Wu , Zhu Wu Fu
Published: July 2014

A series of 4-morpholinothieno [3,2-d] pyrimidine derivatives containing chromone moiety (5a-5e) were synthesized and their structures were confirmed by 1H NMR and MS spectrum. The synthesized compounds were evaluated for their cytotoxicity against three cancer cell lines (PC-3, H460, SGC-7901). Two of them exhibited moderate cytotoxicity and high-selectivity against one or more cell lines. At 10μM levels, the inhibition rate of compound 5c against SGC-7901 cell lines was 58.9%, and that of compound 5d against PC-3 cell lines was 56.4%.
Preparation of Polypropylene/Sisal Fiber Composites and Study on the Fiber Orientation
Authors: Chen Rong Yuan , Huang Zan , Zou Wei , Zhang Hai Chen , Qu Jin Ping
Published: July 2014

The polypropylene/sisal fiber composites were prepared by twin screw extruder and vane extruder, respectively. The tensile test specimens perpendicular to the extrusion direction and parallel to the extrusion direction were prepared from the extruded composites, respectively. SEM observation showed that fiber orientation of sisal fiber in the composites was not obvious when the content of sisal fiber not more than 15wt%. When the content of sisal fiber was 15wt%, the ability to orientate of sisal fiber in the composite prepared by vane extruder was better than that of in the composite prepared by twin screw extruder, which the fiber orientation of sisal fiber was obvious along the extrusion direction in the composite. Tensile tests showed that the tensile properties of the composite parallel to the extrusion direction with 15wt% sisal fiber prepared by vane extruder were the best compared with other composites in this work. The results illustrated that the orientation of sisal fiber in the composites was beneficial to the improvement of the tensile properties of the composites.
Experimental Research on Silicon-Based Composite Resistance Characteristic under Thermal Load
Authors: Du Zhao Heng , Hu Xiao Feng , Wei Ming , Wang Lei , Ren Bo Feng
Published: July 2014

In order to research the resistance characteristic of silicon-based composite tiles under high temperature thermal load on aircraft during its reentry into the earth's atmosphere, the ordinary resistance measurements were comparatively discussed according to the operational environment of composite, two parallel electrodes probe test method was proposed, and the resistance test platform under high temperature thermal load was developed, by which the resistance characteristic of silicon-based composite tiles was continuous monitored under different thermal load. The result shows that: If the temperature is not higher than 600°C, the resistance will increase with the decrease of temperature until it reached the resistance value at room temperature; If the temperature is higher than 700°C, the resistance characteristic will be changed everlastingly; If the temperature is higher than 800°C, the resistance will be less than 1kΩ and will not change any more.
Flame Retardancy Finishing on Wool Fabric via Sol-Gel Method
Authors: Zhang Wei , Zhang Qiang Hua , Chen Guo Qiang , Xing Tie Ling
Published: July 2014

In this paper, silica sols were prepared through sol-gel method and applied onto wool fabric flame resistant finishing. In order to gain good flame retardance of wool fabric, the parameters of preparing pure silica sol and the concentration of doped phosphorus (ammonium biphosphate) in silica sol were optimized taking the LOI values of the treated wool as evaluation index.
Minimum Particle Diameter of the Vanadium/Iron Co-Doped Nano TiO2 Transparent Hydrosol at Room Temperature
Authors: Li Ling , Zhang Wen Ming , Zhang Hua Yan , Xu Zi Hao , Wang Sen , Li Xiao Wei , Dong Guo Yi
Published: July 2014

Vanadium/iron co-doped nanoTiO2 transparent hydrosol with an average particle size of 3.8 nm was synthesized by a novel complexation-controlled hydrolysis method at room temperature and atmospheric pressure by using TiCl4, ferric nitrate, ammonium metavanadate, etc. as raw materials. The composition, phase structure, particle size, absorbance spectrum, and photocatalytic performance of samples were characterized by XRD, EDS, nanolaser particle size analyzer, and UV-Vis spectrophotometer. The photocatalytic properties of V/Fe doped TiO2 were studied through degrading acid 3R dye, and the results show that when the content of V/Fe was 0.5%, the degradation rate reached more than 96% under irridation for 60 min.
Design of the Portable Detector for Formaldehyde
Authors: Fu Li , Fu Xiu Wei
Published: July 2014

The design of the portable formaldehyde detector based electrochemical sensors with microcontroller is introduced in the paper .In conducting the test, the formaldehyde-containing gas diffusion to the sensor internal to react with the internal electrolyte and generates a weak current signal, the current signal through the working circuit is converted to a voltage signal, the voltage signal via the signal processing circuit, and it is collected and processed by MCU after input to the A/D. the signal is communicated with operator through the buttons and LCD.
Preparation and Application of Blocked & Crosslinked Waterborne Polyurethane Microemulsion as Paper Strengthening Agent
Authors: Lai Xiao Juan , Gong Mi Na , Wang Lei
Published: July 2014

By means of self-emulsifying, blocked & crosslinked cationic polyurethane (CBPU) microemulsion was prepared with isophorone diisocyanate (IPDI), polycaprolactone glycol, bisphenol A, methyldiethanolamine (MDEA) as cationic hydrophilic chain-extending agent, ̴̵̹̹̱̼̽͊̿˰̱̓˰̷̲̼̳̻̹̿̾˰̷̵̱̾̈́˰̴̱̾˰̞˽̫˸́˼́˽̴̵̸̹͉̼̽̈́˽̂˽̵̱̳͉̼̈́˹̵̸͉̼̭̈́˽ڂ˽̴̸̴̵̸̹͉͈͉͉̼̱̹͂̿̈́̽̾̿˰̴̵̱̱̹̀͂̿̀̾̽˸̠̔̔˹˰̱̓˰̷̳̼̹̻̹͂̿̓̓̾̾˰̷̵̱̾̈́˾˰̶̶̵̳̈́̓̕˰̶̿˰̸̵̈́˰̠̥̓̒˰̵̴̲̼̳̻̿˰̱̹͂̈́̿˰̿̾˰̸̵̈́˰̸͉̹̳̱̼̀̓˰̵̵̹̀͂̿̀͂̈́̓˰̶̿˰̸̵̈́˰̵̵̴̱̈́͂̈́˰̵̱̀̀͂˰̵̵͇͂˰̴̵̴̹̓̈́ͅ˾˰̸̵̤˰̵̵̵͈̹̱̼̀͂̽̾̈́˰̵̼͂̓̈́̓ͅ˰̸͇̓̿˰̓̈́͂uctures of tertiary amine group, imidazole ring and urethane group are found in CBPU molecular structure. The morphology of the particle is uniform spheric structure and its size is related to the content of tertiary amine groups of CBPU. The paper strength, especially the wet strength can be obviously increased with the increasing of the blocked ratio of CBPU. The optimum blocked ratio of CBPU is 10%.
The Fatigue Life Prediction for EB-PVD Thermal Barrier Coating
Authors: Hao Yong , Qi Hong Yu
Published: July 2014

The electron beam-physical vapor deposition (EB-PVD) coatings were selected to analyze the fatigue life. Firstly the failure mechanisms of oxidation and thermal fatigue of TBCs were considered together. The weight of thermally grown oxide (TGO) were measured during oxidation experiments and modeled. Thermal fatigue experiments were induced by thermal mismatched stress and thermal fatigue with holding time. The failure mechanism was obtained by the finite element analyses. The life prediction model was modified by the shear and normal strain range close to the interface of the top coat and TGO. Based on the experiment data, the life prediction model of thermal fatigue of TBCs was set up for EB-PVD coatings. Finally, using the life prediction model, the life of TBCs was predicted under the designed load case. The life prediction model was verified and all experiment data fall into the factor of 3 scatter band.
Research on Performance Features of Shape Memory Alloys
Authors: Lin Guo Min , Li Yan Hua
Published: July 2014

The shape memory effect,the classification and the principle of shape memory alloys are introduced.The performance features such as melting point,density, resistivity,thermal conductivity, thermal expansion coefficient, phase change heattensile strength fatigue limit, grain size, transition temperature,lag size,one-way shape memory, two-way shape memory of Fe-based,Cu-based and Ti-Ni based shape memory alloys are researched in detail.
Preparation of Polyacrylic Acid/Rice Straw Composite Superabsorbent and the Loading and Release Properties for Urea
Authors: Zhang Feng , Tang Gui , Yu Song Tao , Hou Gui Hua , Xu Ning
Published: July 2014

A novel polyacrylic acid/rice straw (PAA/RS) composite superabsorbent was prepared. The factors that can influence the water absorption of the composite were investigated, including the concentration and neutralization degree of AA, the weight ratios of N, N’-methylenebisacrylamide (MBA) to AA and RS to AA. The results show that gel effect plays a key role in the preparation of PAA/RS composite. The addition of an appropriate amount of rice straw to the composite can significantly improve the water absorption. Under the optimized condition, the water absorption of the prepared PAA/RS composite was 285.4 g/g. The composite exhibits good loading and slow-release properties for urea and is promising in agricultural and horticultural applications.
Research on Grinding Ti6Al4V Alloy with Inner-Lubricating Wheel
Authors: Huo Wen Guo , Zhang Xiang Yu , Dong Qing Yun , Cai Lan Rong , Shao Juan
Published: July 2014

The new wheel could reduce grinding friction and prevent of chip adhesion by lubrication between wheel and workpiece surface. Investigation of the simulation dry grinding Ti6Al4V alloy with monolayer brazed CBN (cubic boron nitride) and diamond grinding wheels, and systematically studies the effect of process parameters on the microstructure of specimen. the cutting properties generated during grinding with internal lubricating wheel. Grinding simulation was carried out with this internal lubricating wheel. The machining properties were assessed in terms of grinding temperature. The results indicate that graphite significantly improve machinability during dry grinding of Ti6Al4V alloy.
Analysis Analysis and Suggestions on Device Clamp Screw Fracture of 110kV Transmission Line
Authors: Xu Xue Xia , Li Wei Yong , Zhang Guang Xing , Feng Yan Ting , Ke Hao , Wang Qiang , Cui Hong Xia
Published: July 2014

Fracture failure analysis on device clamp screws of one 110kV transmission line has been carried out based on results of macro-observation, pre-tightening test, mechanical property examination, chemical composition analysis, microstructure observation, SEM observation and EDAX analysis. It is concluded that the main reason of the screw fracture lies in misuse material and improper heat processing which led to material degradation. Suggestions are put forward finally.
A Study of the Effect of Starch in Polymer Blends of Carboxymethyl Cellulose and Chitosan
Authors: Keungputpong Noppawat , Matchariyakul Nuanjan , Tiptipakorn Sunan
Published: July 2014

This research is divided into 2 parts. In part I, the optimal ratio of polymer blends between chitosan (CS) with carboxymethyl cellulose (CMC) by using glutaraldehyde (GL) as crosslinked agent. In part II, the effect of starch on the properties of polymer blends was determined. The chemical interaction of the blends was studied with Fourier Transform Infrared Spectroscope (FT-IR). The thermal properties of polymer blends were also determined with differential scanning calorimeter (DSC) and thermogravimetric analyzer (TGA). Moreover, the study of physical property was performed with a Swelling Test method. From test results in part I, the optimal ratio between CS (0.8%w/v) and CMC (0.8%w/v) was 3:2 by volume. Furthermore, the FT-IR spectra reveals the chemical interaction (C=N). In part II, the blend which was added with 50 percent by weight of starch show the highest glass transition temperature. The maximum rate of decomposition temperature and the percentage of swelling were increased with the increase of starch.
Preparation of Zeolite 4A Using Laterite Nickel Slag and the Characteristic Study of CO2/N2 Separation
Authors: Du Tao , Li Sheng Lu , Yang Fan
Published: July 2014

Laterite nickel ore is a kind of abundant and low-cost ore. In order to obtain the cheap and high-performance adsorption material, this paper addresses that Zeolite 4A was synthesized by laterite nickel slag, based on two-step hydrothermal synthesis procedure and alkali-melting process. The crystallization degrees of different kinds of Zeolite 4A were explored under different ratios of the reactants. Optimal condition was found out for synthesis of Zeolite 4A, including the ratios of the reactants. Finally, Zeolite 4A obtained under the optimal condition was tested by XRF, NOVA 1200e physical adsorption analyzer, and SEW separately, which confirmed its high purity and complete crystals. Finally, separation of CO2/N2 by Zeolite 4A using STA409PC Physical adsorption instrument was studied, revealing good adsorption selectivity which became lower with rising temperature.
The Preparation and Detection of Quality Standard about Houttuynia Spray
Authors: Xia Ting , Chen Qi Dan , Wang Jian Kang , Zeng Jing , Guo Jing Yan
Published: July 2014

To explore of houttuyniae cordata quercetin best extraction solution and detection of quality standard about houttuynia spray. The study extracted quercetin from houttuyniae cordata using alcohol water extraction, ultrasonic extraction and supercritical CO2 extraction respectively, and then choosed the best solution to prepare sprays of houttuynia cordata. To conform the state pharmaceutical quality standards, quality standards were detected from four aspects in spray volume of each press, particle size, injection experiment and installation. The method of oultrasonic extraction was the best extraction method, and the concentrations of 70% ethanol was the most efficient extraction of quercetin.The technology of spray preparation is fast and feasible, and the method of content detection is reliable.These results showed houttuyniae cordata could develop spray and conform the state pharmaceutical quality standards.
Hedgehog Buckyball: High-Symmetry Complete Polyhedral Oligomeric Silsesquioxanes (POSSs) Characterized by UV-MALDI-TOF Mass Spectrometry
Authors: Lin De Rong , Hu Li Jiang
Published: July 2014

In this study, we report the first example of a fullerene-like cage, a stable hedgehog buckyball (HBB). The HBB preparation can be performed using a normal hydrolytic condensation which we previously produced based on [(3-methacryloxy) propyl] trimethoxysilane (MPMS). MPMS was also used as a precursor for this study, but a longer condensation time was employed to produce more viscous products with a larger molecular weight (denoted MPOSS or MSSO).A high-symmetry complete POSS formulated as R60Si60O90 or T60 (T=RSiO1.5). The MSSO characterization can be determined by FTIR and GPC and NMR and is assigned from the peaks of UV-MALDI-TOF MS.
Research on Microstructure and Properties of Plasma Powder Spray Welding Layer Based on 3D Printing
Authors: Meheretu Embabo , Wang Zhong Min , Han Hai Chuan
Published: July 2014

Plasma powder spray welding method is used for depositing successive layers of metal, which forms a 3-Demensional (3D) solid component. Fe45 alloy powder is chosen to spray welding on Q235 steel. Welding process parameters of plasma powder spray welding are studied, which affected the performance of carbon steel weld layer. Then changes of alloy powder spray welding and influences of weld microstructure after spray welding are analyzed. Experiments results show that in the case of only changing transferred arc current, the microstructure and mechanical properties of the weld is obviously better, grain size distributes uniformity, and hardness is moderate.
The Bioactivity of Gradient Composite Bioceramic Coating with Two Kinds of Rare Earth Oxide Fabricated by Wide Band Laser Cladding
Authors: Jiang Pei Ze , Liu Qi Bin , Zhang Ling Yan , Jiang Hai Bin , Zhang Zheng
Published: July 2014

To improve bioactivity of gradient bioceramic coating, the coating with two kinds of rare earth oxide was produced by wide band laser cladding technique. As the experimental results, whichadded0.6wt.% La2O3 fixedly, and increased the addition amount of the CeO2, when the addition of CeO2fulfill 0.4wt.%, the amount of HA-β-TCP is the largest in this experiment. Soaking the specimens in SBF for 14 days, the coating blended 0.6wt% La2O3 and 0.4wt% CeO2, then a great quantity of Ca-P white particles can be found on coating, which confirmation this bioceramic coating is of best bioactivity.
The Chemistry Model of Ion-Ion Interaction Energy of Full Ionized Hydrogen Plasma
Authors: Guo Li Shuai , Zheng Xing Rong , Wu Zhi Rong
Published: July 2014

The ion-ion interaction contribution to the Helmholtz free energy is one of thermodynamic properties which discribing full ionized hydrogen plasma. Based quantum statistical theory and its simulation results to construct the free energy model of statistical mechanics, it is great significant to understand the properties of full ionized hydrogen plasma under high temperatures and pressures. Using Fortran program, we calculated the isotherms with some sensitive parameters, making comparison between our results and the formers. We find that former formula proposed by Chabrier appears variation at ultra-high temperatures ( > Κ ), implying a prominent limit of low temperature, while we developed a more reasonable formula of the ion-ion interaction contribution to the Helmholtz free energy. Analyses on isotherm curves indicate that the thermodynamic properties of the ion-ion interaction contribution to the Helmholtz free energy described by our approximant is very stable at all temperatures and pressures without any unphysical effects at low temperatures.
Evaluation the Effect of Anti-Oxidation of Chondroitin Sulfate
Authors: Xu Li Ping , Wang Xin
Published: July 2014

Study of the antioxidant activity of chondroitin sulfate extracted from chicken cartilage. The total antioxidant capacity, inhibition the capacity of anti-superoxide anion, hydroxyl radical, anti-liposome and Alkyl radical was determined, respectively; the effect of the anti-oxidation of chondroitin sulfate was observed. The result indicated that chondroitin sulfate had the strong elimination ability to the five free radicals. The ability of total antioxidant the values of scavenging activities of the maximum inhibition rate to anti-superoxide anion, hydroxyl radical, anti-liposome and alkyl radical was 30.56 U/mL, 97.74%, 80.69% ,48.05% and 78.57%, respectively.
Research on the Treatment of the Yellow River Micro-Polluted Water in Shanxi by Ozone-Activated Carbon Process
Authors: Tang Xiao Bin , Zou Jian Feng , He Kai Fan , Liu Jian , Zhou Jian Jun , Wang Fu Jin , Yuan Yi Xing , He Jun Guo
Published: July 2014

In this study, the micro-polluted water of a reservoir filled with Yellow River water in Shanxi was used as the raw water. The removals of chemical oxygen demand (CODMn), ammonia nitrogen, petroleum substances, and volatile phenol were investigated by ozone-activated carbon process. Results showed that ozone-activated carbon process had a good removal of the pollutants mentioned above. The optimum dosage of ozone for each pollutant was 2.0 mg/L, 2.5 mg/L, 3.0 mg/L, 3.0mg/L, with the corresponding removal efficiency of 59.36 %, 88.01%, 79.31%, and 88.16%, respectively. The treated water quality could meet the standards for Drinking Water Quality (GB5749-2006) in China.
Dye Adsorbent Prepared by Crosslinking of Poly(γ-glutamic acid) and Gelatin
Authors: Wang Wei , Liu Shu Ping , Guan Hua Nan , Liang Jin Zhong , Tan Chong
Published: July 2014

The present paper describes the preparation of novel biodegradable adsorbent based on cross-linking of poly (γ-glutamic acid) (γ-PGA) and gelatin and characterization of its Rhodamine B dye adsorption capability. Cross-linking effect was measured with the effect of adsorbent adsorbing ionic dyes Rhodamine B. In the experiment, the various factors which had influence on the adsorption effect, including preparationtemperature, preparation pH value, concentrations of cross-linking agent, cross-linking time were analyzed. The results showed that the adsorbent had good adsorption performance after cross-linking. The adsorbent was characterized by fourier transform infrared spectrum (FTIR), revealing that there were amide bonds between gelatin and poly (γ-glutamic acid) by cross-linking reaction.
Coupled Hydrogen and Oxygen Isotope Analyses for the Mainstream of Poyanghu Lake (Jiangxi Province) and their Environmental Implications
Authors: Lai Dong Rong , Wang An Dong , Li Cong Guan , Chen Yi Ping , Yan Zhao Bin , Wan Jian Jun
Published: July 2014

Poyanghu Lake located in the northern Jiangxi Province is the largest freshwater lake and also the second largest lake in China. In the present contribution, several water samples have been collected and carried out for hydrogen and oxygen isotope analyses. The results suggest that they have relatively higher hydrogen and oxygen isotopic ratios than those of meteoric water. Combined with previous data, we propose that the Poyanghu Lake water display higher stable isotopic compositions due to the strong evaporation and water-rock interaction.
Adsorption Removal of Phosphorus from Wastewater by Steel Slag Filter Material
Authors: Wang Juan Ting , Yu Yan Zhen , Gao Long Long
Published: July 2014

Spherical steel slag filter material with high porosity, large specific surface area was made by using steel slag as the main raw material, adding binder and pore forming agent. The influences of PH, phosphorus concentration and adsorption time on the adsorption effect of steel slag filter material were investigated. The adsorption characteristics of steel slag filter on phosphorus were studied based on adsorption isotherm model and adsorption kinetics model. Adsorption results were used to fit Langmuir and Freundlish formula. The correlation of Freundlish model was significant and the correlation coefficient was 0.92907.
Study on Removing Atrazine and Chlorothalonil in Raw Water in Reservoirs in North China by PAC Adsorption and Enhanced Coagulation
Authors: Zou Jian Feng , Tang Xiao Bin , Yu Miao , Zhou Jian Jun , Wang Fu Jin , He Jun Guo , Yuan Yi Xing
Published: July 2014

By the coagulation-flocculation jar test, the PAC adsorption property and coagulation removal property of Atrazine and Chlorothalonil, and influence on removal effect of Atrazine and Chlorothalonil by PAC Adsorption and Enhanced Coagulation in combination have been acknowledged, with different doses of PAC or polyaluminium chloride. The results of test showed that PAC can absorb Atrazine and Chlorothalonil effectively, and that the removal effect of the enhanced coagulation for Atrazine and Chlorothalonil is affected by coagulation effect. Enhanced coagulation cannot remove Atrazine effectively, while it can remove 75% of Chlorothalonil. PAC adsorption and enhanced coagulation in combination can remove Atrazine and Chlorothalonil effectively. For the initial concentration of 0.1 mg/L of Atrazine, dosage of 60mg/L of PAC and 20mg/L polyaluminium chloride can reach more than 98% removal efficiency, and make treated water standard. For the initial concentration of 0.1 mg/L of Chlorothalonil, dosage of 20mg/L of PAC and 20mg/L polyaluminium chloride can reach more than 90% removal efficiency and make treated water up to standard.
Modified Reduced Graphene Oxide with Enhanced Solubility and Conductivity and its Application
Authors: Zeng Xiao Peng
Published: July 2014

Graphene oxide was modified with phenyl isocyanate first, and then reduced by a two step method-reduction with hydrazine hydrate first and an additional reduction in H2/Ar. The reduction with hydrazine hydrate in the first step can effectively remove the epoxy groups on the graphene, and the disposure of reduced graphene oxide (RGO) with H2 will change the residual amides and carbamate esters into conjugated C=N-ph structure. The introduced phenyl isocyanate not only acts as a functionalized group to prevent the aggregation of graphene but also will increase the electron concentration because of additional benzene. The resulted functionalized graphene can well dispersed in DMF, and the electrical conductivity of the functionalized graphene can reach 3.42×104S/m,which is far high than the method only reduce with the chemical reductant or H2/Ar. The prepared functionalized graphene is beneficial for the fabrication of graphene-based polymer nanocomposites. The conductivity of resulted modified graphene/PMMA composite with 5wt% filler content is 3.2S/m.
Simulation Realization of Frequency-Variable and Speed-Adjustable System Based on Vector Control
Authors: She Yan
Published: July 2014

To provide the necessary design parameters for the actual motor control system, The paper introduces the modeling course of voltage space vector pulse wide modulation (SVPWM) arithmetic and AC motor under MATLAB/SIMULINK environment, discuss founding dynamic model of frequency-variable speed-adjustable system based on vector control, according to the principle of SVPWM. The paper presents the new detailed method of realizing simulation, key problems and results of the simulation were analyzed in detail. The experimental simulation results show that this system has smaller fluctuations of voltage and torque, quicker response speed, and all of the indicators accord with the performance of the actual motor. the simulation arithmetic have value to realize controlling motor with digital signals processing.
Research Status and Application Prospect of Deep Cryogenic Treatment Technology on Cemented Carbide
Authors: Guan Tu Hua , Liu Hong Mei , Xu Yuan Bin , Wu Cheng Qun , Lv Yi
Published: July 2014

Cryogenic treatment as an effective non-destructive modification of material, has been widely applied. Equipments and technologies of cryogenic treatment were described, the current research status of cryogenic treatment technology on cemented carbide was reviewed, the action mechanism of cemented carbide cryogenic treatment was analyzed. Finally, in this paper some views and outlooks of cryogenic treatment technology in industrial applications were put forward.
The Fatigue Performance Evaluation of Pressure Vessel Steel Using Modified Staircase Method
Authors: Xue Huan , Li Rong Feng , Wu Li Xin , Peng Wen Jie , Huang Jing Qing
Published: July 2014

Increasing attention has been paid on fatigue performance evaluation in the recent years. More efficient fatigue testing methods are imperatively needed to accomplish the test requirement. The modified staircase theory is introduced in this paper. Traditional staircase method and modified staircase method are respectively used to evaluate the fatigue performance of pressure vessel steel Q345R. Results show the fatigue limits are 194MPa and 193MPa respectively, which indicates the modified staircase method can enhance the testing efficiency about 50% and keep the test veracity.
Numerical Simulation Study of Stress-Magnetization Effect on Different Notch Steel Specimens
Authors: Xi Xiao Wen , Ren Shang Kun , Huang Yin
Published: July 2014

To study the mechanism of metal magnetic memory (MMM) testing technology, the stress-magnetization effect on 20 steel specimens with different notch angles under exercise of the geomagnetic field and tensile load is simulated by using the finite element analysis (FEA) software ANSYS. With the stimulation, the stress and magnetic flux leakage distribution of the specimens is given. The results showed that internal stress distribution of different notch specimens under external tensile effects is different; The curves of relationship between damage degree of stress concentration and the distribution of magnetic flux leakage is also related to the defect shape and structure; Magnetization decreases with increases of stress at first and then increases with continuing increase of stress, which is called stress magnetization reversal. It provides an important reference for the quantitative research of metal magnetic memory technology.
Study on Factors of Axial Crushing of Thin-Walled High-Strength Steel Sections Used in Passenger Car
Authors: Zhao Gui Fan , Hu Yao Wei , Cheng Xiao , Xiao Ke
Published: July 2014

This paper firstly studied the structure of front longitudinal, then reviewing comprehensive literature draw the similarity of collision of the thin-walled tube and front longitudinal,finally ensure the study of collision of the thin-walled tube. And establishing three kinds of thin-walled welded rectangular beam finite element model of spot welding, seam welding and laser welding, arrive a more superior technology through researching and analyzing the model.
Study on the Borehole Stability in Liulin Coal Reservoirs
Authors: Song Li Yang , Xiao Li Jia , Wang Ji Wei , Zhang Jin , Zhuang Tian Lin
Published: July 2014

This paper studied the borehole stability in Liulin bituminous core reservoirs during under-balanced drilling. The equivalent depth method was applied to study the formation pore pressure. The floor drain test method was applied to study the ground stress. Core strength experiments combined with logging data were used in the establishment of core strength predicting model. Mechanics analysis model was founded to study the borehole stability in the core reservoir. According to the studying and analyzing results, the under-balance drilling in Liulin coal reservoirs enjoys good borehole stability.
Effect of Sodium Methylacrysulfonate upon the Molecular Weight and Performance of Polycarboxylate Superplasticizer
Authors: Xiong Long , Zheng Guang Jun , Bi Yao , Fu Cheng Fei , Wang Shao Feng
Published: July 2014

The effect of sodium methylacrysulfonate (SMAS) upon the molecular weight, molecular weight distribution and polycarboxylate (PCE)’s dispersion and dispersion-retaining ability were investigated by Gel permeation chromatography (GPC) and test of the fluidity of cement pastes. The results showed that the dosage of SMAS was inversely proportional to the molecular weight of polycarboxylate, and a cubic equation relationship existed between the molecular weight of the polycarboxylate and the reciprocal of SMAS dosage. There was an optimum middle dosage of sodium methylacrysulfonate which could control the molecular weight polycarboxylate, and then affect its dispersion and dispersion maintain performance. The effect of sodium methylacrysulfonate on the monomer conversion rate was also systematically discussed by means of high performance liquid chromatography (HPLC).
Stability Analysis of Single-Pier Variable Cross-Section Box-Girder Continuous Bridge
Authors: Yin Guan Sheng , Bai Jie , Feng Jun Jie
Published: July 2014

On the basis of Umansky box-girder torsion theory, the software of ANSYS is applied to simulate related engineering model. In considering a variety of live load conditions, the lateral stability of multi-span single-pier variable cross-section box-girder under torsion eccentric load is analyzed. Analysis results reveal that under different working conditions, the factors affecting the transverse stability of the bridge and the proportion of the value on each, such as gravity, the span ratio and the distance between support are different; When the overload ratio is 2 times larger, the bridge stability safety coefficient decreases along the curve and changes rapidly. In the future design of this kind of bridge, the overall lateral stability should be paid much more attention. Some methods and suggestions about how to prevent the emergence of security and stability problems are put forward in the end.
Calculation about Stress Concentration Coefficient of Welded Cruciform Joints of Magnesium Alloy Based on FEM
Authors: He Bo Lin , Yu Ying Xia , Zhang Xiao Dong , Xia Song Song
Published: July 2014

Geometrical parameters of welded joint affect the stress concentration coefficient seriously. In order to increase the fatigue property of welded structure, it has great significance to reduce stress concentration coefficient of welded structures by researching and improving the geometry of welded joints. In this paper, the effects of weld tangent line angle θ on the stress concentration coefficient of welded cruciform joints of magnesium alloy were analyzed by using ABAQUS finite element program, and the change rule of stress concentration coefficient with the variation of the parameter was also researched. The calculation results indicate that reducing the weld tangent line angle θ can effectively decrease the stress concentration coefficient of welded cruciform joints, so as to improve the fatigue property of welded structures. In order to have high reliability and safety of welded structures of magnesium alloy, the true weld tangent line angle θ should be controlled less than 25°.
Effect Study of Water on the Mechanical Behavior of Gangue in Chongqing Tongliang Mine
Authors: Zang Ya Jun
Published: July 2014

This paper first analyzes the strength and deformation characteristics of gangue dispersion, Subsequent analysis of the effect of water on the strength, deformation characteristics. And discusses the permeability characteristics of gangue dispersion and dispersion of particle size, pore characteristics and the dumping years effect on its permeability.
Experimental Research on Tensile Strength of Out-of-Plane Composite Joints for Integrated Composite Cabins
Authors: Zhang Dong Hua , Zhou Xiao Hong , Zhou Long Wei
Published: July 2014

An experimental study of tensile failure behaviors of L-shaped adhesive-bonded and bolted hybrid composite joints, which are designed to connect composite cabins, is performed. A set of rigid jigs was designed to fix the specimens and ensure to apply an axial tensile load. The damage processes, failure loads and ultimate failure patterns of the joints are obtained from the tests. Some indentation around the fastener hole and remarkable discontinuity departure between the top and bottom L-shaped laminates which leads to the catastrophic failure can be observed on the specimens. It follows that the discontinuity is the weak spot and required to be strengthened.
New Method to Predict the Bearing Capacity and End-Bearing Ratio of Friction-Type Long Pile
Authors: Qian Zheng , Wang Kui Hua
Published: July 2014

The purpose of this paper was to predict piles’ bearing capacities and end-bearing ratios. Finite-Element-Method was derived to establish the simulation models. The studying processes were firstly to set some unified pile top settlements and then to vary pile diameters to obtain the results, thus the performance of pile could be observed. It was found that closing to ultimate state, loads under the unified settlements were approximately linear to pile diameters, and equivalent unit side-friction forces were nearly constant, and the end-bearing ratios were piecewise linear to pile diameters. Based on these findings, predictive formulas were established. Following the formulas, while piles’ bearing capacities of two certain diameters and one end-bearing ratio of them were known, the bearing capacities, side-friction forces and end resistances of other concerned diameters could be predicted.
Research on the Succession of Artemisia ordosica Community in Mu Us Sandy Land
Authors: Zhang Jun Hong
Published: July 2014

Mu Us sandy land is an important ecological barrier in Northern China. Artemisia ordosica is the dominant species in Mu Us sandy land, the development of biological soil crust in Artemisia ordosica community seriously impediment precipitations, which result in the deterioration of soil water within 40cm, where most of Artemisia ordosica roots distribution. That led to the recession of Artemisia ordosica in the fixed sand dunes in a long time.
Numerical Simulation of the Kinetic Energy Projectile Oblique Penetration into the Concrete
Authors: Chen Jun , Ye Xiao Jun
Published: July 2014

ANSYS-LS/DYNA 3D finite element software projectile penetrating concrete target three-dimensional numerical simulation , has been the target characteristics and destroy ballistic missile trajectory , velocity and acceleration and analyze penetration and the time between relationship , compared with the test results , the phenomenon is consistent with the simulation results. The results show that : the destruction process finite element software can better demonstrate concrete tests revealed the phenomenon can not be observed , estimated penetration depth and direction of the oblique penetration missile deflection .
Advanced Materials for Gene Delivery
Authors: Mazumder Mohammad A. Jafar , Zahir Md. Hasan , Zaman Sharif F.
Published: July 2014

Gene therapy is a widespread and promising treatment of many diseases resulting from genetic disorders, infections and cancer. The feasibility of the gene therapy is mainly depends on the development of appropriate method and suitable vectors. For an efficient gene delivery, it is very important to use a carrier that is easy to produce, stable, non-oncogenic and non-immunogenic. Currently most of the vectors actually suffer from many problems. Therefore, the ideal gene therapy delivery system should be developed that can be easily used for highly efficient delivery and able to maintain long-term gene expression, and can be applicable to basic research as well as clinical settings. This article provides a brief over view on the concept and aim of gene delivery, the different gene delivery systems and use of different materials as a carrier in the area of gene therapy.
Importance of Eco-Friendly OLED Lighting
Authors: Thejokalyani N. , Dhoble S.J.
Published: July 2014

The importance of artificial light has long been recognized as it extends the day. Copious corporations and academic institutions are investing cosmic treasures in tracking down the advanced artificial lighting applications with a vision towards energy efficient and eco-friendly solid state lighting. In this regard, organic light-emitting diodes (OLEDs) are going to change the human lifestyle, by offering a promising avenue to develop future energy saving solid-state lighting sources because of their intrinsic characteristics such as low driving voltage, high resolution, high brightness, large viewing angle, large color gamut, high contrast, less weight and size, efficiency etc., there by dictating their ability to reach the pinnacle in the field of flat panel displays and solid state lighting sources. With the goal towards future application, many design strategies like synthesis of novel materials, well judged anatomy of device configuration, development of refined and low cost fabrication techniques have been put forward to achieve high efficiency, good color stability and quality lighting. Practical applications, which enrich the ideas of the specialists in this field to develop new routes for future research development of OLEDs are enumerated and illustrated by specific examples. This chapter also integrates the novel approaches for energy efficient and eco-friendly solid state lighting as well as the limitations and global haphazards of currently used lighting systems. The current state of the art, ongoing challenges and future perspectives of this research frontier to reduce the driving voltage, minimization of degradation issues, enhance their life time are illustrated. Review on the status and future outlook of these OLEDs strongly reveals their emergence in the next few years.
Development and Application of Luminescence to Earth and Planetary Sciences: Some Landmarks
Authors: Biswas R.H.
Published: July 2014

Luminescence, mainly thermoluminescence (TL) and optically stimulated luminescence (OSL), has been researched for more than five decades towards its application to earth and planetary sciences. Luminescence production mechanism has been understood through several theoretical studies, like analytical kinetic theory, numerical models along with the experimental results. Instrument development has progressed with aim from user friendly TL/OSL reader dedicated for dating to challenging reader forin-situMartian sediment dating. Since the development of optical dating in 1985, the technique revolutionised the research in earth sciences. And since then to recent, many methodologies have been developed and some are in developing stage using different signals, like, single grain OSL, red TL, time resolved OSL, thermally transferred OSL (TT-OSL), post infrared-infrared stimulated luminescence (pIR-IRSL), violet light stimulated luminescence (VSL), infrared radioluminescence (IRRL), etc. with an objective to improve the accuracy and precision and to extend the dating range. The wide range of application in different environment, e.g. aeolian, fluvial, marine, glacier, soil, volcanic materials, heated materials, shocked materials, meteorites, etc. have made the technique successful to understand the quaternary history of earth and planetary information like terrestrial and cosmic ray exposure ages of meteorite, meteoroid orbit, thermal metamorphism history of meteorite etc. The aim of this present paper is to discuss some landmarks and recent trends in the development and application in these areas. Contents of the Paper
Transient Dynamic Analysis of Cracked Multiﬁeld Solids with Consideration of Crack-Face Contact and Semi-Permeable Electric/Magnetic Boundary Conditions
Authors: Wünsche Michael , Sáez Andrés , García-Sánchez Felipe , Zhang Chuan Zeng , Domínguez Jose
Published: July 2014

Boundary element method (BEM) formulations for transient dynamic crack analysis intwo-dimensional (2D) multiﬁeld materials are reviwed in this paper. Both homogeneous and lin-ear piezoelectric as well as magnetoelectroelastic material models are considered. Special attentionis paid to properly modeling the non-linear crack-face contact and semi-permeable electric/magneticboundary conditions. Implementation of the corresponding time-domain BEM(TDBEM) is discussedin detail. The proposed TDBEM uses a Galerkin-method for the spatial discretization, whilst thecollocation method is considered for the temporal discretization. Iterative solution algorithms aredeveloped to compute the non-linear crack-face boundary conditions. Crack-tip elements that ac-count for the square-root local behavior of the crack opening displacements (CODs) at the crack-tipsare implemented. In this way, stress intensity factors (SIF), electric displacement intensity factor(EDIF) and magnetic induction intensity factor (MIIF) may be accurately evaluated from the nu-merically computed CODs at the closest nodes to the crack-tips. Numerical examples involving sta-tionary cracks in piezoelectric and magnetoelectroelastic solids under different combined (mechani-cal/electric/magnetic) impact loadings are investigated, in order to illustrate the effectiveness of theproposed approach and characterize the inﬂuence of the semi-permeable crack-face boundary condi-tions on the dynamic ﬁeld intensity factors.
BEM and Tangent Operator Technique Applied to Analysis of Contact Problems
Authors: Ferreira Cordeiro Sergio Gustavo , Leonel Edson Denner
Published: July 2014

The boundary element method (BEM) is a robust and accurate numerical technique to deal contact problems, because the contact among solids occurs along its boundaries. In this regard, this work presents a nonlinear BEM formulation applied to contact problems simulation. The formulation is based on the use of singular or hyper-singular integral equations of BEM, for multi-region contact, and the dual version of BEM to simulate the contact between crack surfaces. The mechanical nonlinear behaviour introduced by the contact is represented by the Coulomb’s friction law. The nonlinear formulation uses the tangent operator technique, in which one uses the derivate set of algebraic equations to construct the corrections field for the nonlinear process. This implicit formulation has shown accurate as the classical approach. However it is faster, in terms of computational time consuming, than the classical nonlinear approach. Examples of simple and multi-region contact problems are presented in order to illustrate the applicability of the proposed nonlinear numerical scheme.
Anisotropic Contact and Wear Simulation Using Boundary Elements
Authors: Rodríguez-Tembleque Luis , Aliabadi M.H. , Abascal R.
Published: July 2014

Wear is present in all mechanical interface interaction problems contact, fretting, orrolling-contact, and it is one of the main reasons for inoperability in mechanical components. Thepresented work is a review of recent research carried out by the authors [1, 2, 3]. A boundary-element-based methodology to compute anisotropic wear on 3D contact, fretting, or rolling-contact conditionsis presented. Damage on the geometries of the solids and the contact pressures evolution under or-thotropic tribological properties can be predicted using this contact framework, where the formulationuses the Boundary Element Method to compute the elastic inuence coefcients. Contact problem isbased on an Augmented Lagrangian formulation, and restrictions fullment is established by a set ofprojection functions. The boundary element anisotropic wear formulation presented is illustrated withsome examples, in which some studies about the inuence of anisotropic wear on contact variablesevolution are shown.
Life Assessment in Fretting Fatigue
Authors: Navarro Carlos , Vázquez Jesús , Domínguez Jaime
Published: July 2014

Fretting fatigue denotes the detrimental effect on a material arising from the cyclic sliding of two contacting surfaces with small relative displacements between them. One or both of the components in contact may be subject to bulk stresses caused by cyclic loads. The assessment of the fretting fatigue strength and life of any component is a complicated issue due to the many parameters affecting it, the complexity of the stress fields cyclic variation during fretting and the uncertainties associated to the contact conditions. This paper describes some singular aspects of fretting fatigue related to strength analysis and testing, presents a procedure developed by the authors during the last years to estimate the fretting fatigue strength and life and compares the assessment outcomes with the results of tests carried out by different authors.
Design of a Long-Term Monitoring System for a PSC Continuous Box-Girder Bridge
Authors: Chen Chuang , Mosbeh R. Kaloop , Wang Zong Lin , Gao Qing Fei , Zhong Jun Fei
Published: July 2014

Structural Health Monitoring is becoming an increasingly common tool to obtain the long-term performance of infrastructures and buildings. Many structural health monitoring systems were developed and applied to different bridges in the world. However, very little is known on the applications in extreme cold environment. Fu Sui Bridge, a 1070 m variable cross-section continuous box-girder bridge, is located in the coldest province -- Heilongjiang province, China. In order to monitor the static and dynamic responses of the bridge under the traffic and environmental variation, a long-term continuous monitoring system was designed and installed on Fu Sui Bridge in April 2012. A hydrostatic leveling system was used to measure the displacement and fiber Bragg grating sensors were used to measure strain, acceleration and temperature. Moreover, other necessary components including data acquisition and transmission, data calculation and analysis software are also described. Summer and winter monitoring data are also presented. This paper focuses on: (1) the design and installation of the long-term continuous monitoring system hardware and (2) the operating pattern and function of the automatic monitoring system. After more than one year successful conducting, the system has provided a large amount of data records for daily management and research of the bridge. This system can be applied to extremely cold region.