bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthetic Small Molecules Targeting G-Quadruplexes and their Application
Authors: Yu Hui , Wang Yan Li , Zhao Xiao Yin , Zhang Wen
Published: February 2015

G-quadruplex is expected to be a promising target for drug design. The manually synthesized small-molecule compounds are able to induce the formation of and stabilize G-quadruplexes. In this paper, we summarize the current understanding of the structure of G-quadruplexes, the binding mode of G-quadruplexes and small-molecule ligands, and important synthesized small molecules targeting G-quadruplexes as potential drugs.
Structures and Performances of PA6/PVA Nanofibers Membranes from Electrospinning
Authors: Xu Yan , Gao Bing , Zuo Bao Qi
Published: February 2015

The effects of different proportions of poly (vinyl alcohol) and polyamide 6 on the structure and property of electrospun PA6/PVA membranes have been studied. According to a certain proportion, PVA and PA6 were dissolved in formic acid. The solution was electrospun at 70 kV. The nanofibers membranes were characterized by SEM, FT-IR, XRD, TGA and DSC analyses. The sound absorption coefficients of each absorber are measured with SW477 impedance tube. PA6/PVA composite mats with good compatibility and relatively stable performance, and enhanced sound absorption and property may have many other important applications.
Hydrothermally Synthesized Magnetically Separable RGO Supported Nanocomposite for Water Purification
Authors: Joshi Mahesh Kumar , Pant Hem Raj , Kim Han Joo , Liao Ni Na , Kim Jun Hee , Shrestha Bishnu Kumar , Park Chan Hee , Kim Cheol Sang
Published: February 2015

Wastewater containing dyes and microbial bodies has attracted global attention because of the harmful effects on aquatic environment and human health. A considerable amount of dyes are present in the industrial effluents due to the loss during the processing of industrial products. The purpose of this study was to syntheses the composite particle for the effective removal of dyes and microbial bodies from aqueous solution. For this purpose, RGO supported nanocomposite was prepared using hydrothermal treatment of aqueous solution containing graphene oxide (GO), aqueous solution of silver nitrate and ferrous chloride tetrahydrate, and ethanol as precursor. Transmission electron microscopy, Raman spectroscopy, and X-ray diffraction indicated the formation of RGO supported silver doped iron oxide nanocomposite. As synthesized nanocomposite was highly effective for the adsorption of methylene blue and reduction of p-nitrophenol in aqueous solution, and also had high antibacterial capacity. The composite synthesis protocol is a simple and efficient to produce a unique composite for environmental remediation.
Researching on a New Grouting Material and its Engineering Application
Authors: Dou Jing Lei , Dou Jing Feng , Guo Yu Juan
Published: February 2015

Water-irruption is the second to gas explosion of major security problems in coal mine. The grouting material is composed of fly ash and montmorillonite separately according to a certain proportion with pure cement material. On the site grouting test and compare the compressive strength of the stones of the body and the size of the diffusion radius, and compare the grouting materials with pure cement materials. Through the comparative and analysis, the reasonable grouting materials are choosen.
Approaching Capacitive Deionization (CDI) on Desalination of Water and Wastewater - New Progress and its Potential
Authors: Wang Li , Zhou Yun , Wang Jie , Hu Ning
Published: February 2015

Capacitive deionization (CDI) technology is a challenge on an economical and effective electrosorption desalination method. The paper analyses the CDI current status and progress of carbon electrode materials, and describes the types of CDI and its performances of testing materials. The electrosorption capacities are summarized on the carbon electrode materials and the current hurdles. The reported numbers from the literature vary in a wide range between 0.25 and 26.42 mg/g of both electrodes CDI cell, we suggest that the CDI electrodes should have an adsorption of at least 9.0 mg/g NaCl when the applyed voltage is 2.0 V. The potential capacitive deionization technologies are proposed here.
An Experimental Study on Ammonia-Nitrogen Removal from Waste Water with Modified Absorbent
Authors: Xiao Li Ping , Geng Xin Hui , Pei Ge
Published: February 2015

In order to search for an effective adsorbent on ammonia-nitrogen, a comparative study has been conducted on bentonite, zeolite and fly ash, which have been modified by hydrochloric acid, sodium hydroxide，sodium chloride and thermal to reveal ammonia nitrogen removal efficiency, respectively. The results showed that the modified zeolite of sodium chloride was an ideal adsorbent. The adsorption mechanism of sodium chloride-modified adsorbent was demonstrated via the Scanning Electron Microscope(SEM) analyses and relative theories. The removal percentage of ammonia-nitrogen could be as high as 88.34 % when the dosage of initial ammonia-nitrogen was 30 mg/L, the pH value was 8, the stirring intensity was 150 r/min, the dosage of modified zeolite was 20 g/L and the adsorption time was 120 min, which increased by 20 % than unmodified zeolite. The adsorption of sodium chloride-modified zeolite to ammonia-nitrogen is a superior adsorbent.
Experimental Research on Alkaline Residue Concrete Dry Shrinkage Performance
Authors: Zhang Yuan , Cao Jun
Published: February 2015

Shrinkage performance of alkaline residue concrete is researched in different conditions, it found that different alkaline residue proportions concrete dry shrinkage increases with the growth of the curing time increasing, but the dry shrinkage changes of different alkaline residue proportions are different, the dry shrinkage of low proportions of 8-12% concrete is similar with that of plain concrete, therefore, to the high content of concrete, its dry shrinkage significantly increase. The dry shrinkage of low incorporation proportion (8-12%) concrete increases quickly in the initial curing period (3-7 days), its shrinkage rate changes stabilized in the subsequent conservation period; to high incorporation proportion (20-30%) concrete, its dry shrinkage increases rapidly in the curing period of 7-14 days, then it stabilized. compared with the low proportion of concrete, its growth is faster in the late curing period. Water-cement ratio is very important factor of the shrinkage performance of concrete, dry shrinkage curve of alkaline residue concrete present concave, when water-cement ratio are in 0.52-0.57, the shrinkage of alkaline residue concrete is minimum.
Apply for RC Beams and Slabs Strengthened with New Inorganic Adhesives Sticked FRP Sheets
Authors: Zhang Ai Lian
Published: February 2015

A new inorganic nonmetallic cementing material rather than epoxy resin was adopted in carbon fiber sheet (CFS) strengthened concrete beams and slabs in this paper. Firstly, the types of inorganic adhesive were introduced and double-shear tests and the compressive strength of specimens as a function of temperature were studied to prove the effectiveness of inorganic adhesive in CFS strengthened concrete beams and slabs was studied. The practice shows that MPB has good performance when applying at high temperature. RC beams and slabs strengthened with new inorganic adhesives sticked FRP sheets are feasible. The appearance of MPB renders an extensive prospect for carbon fiber sheet (CFS) application in building structure reinforcement.
Particleboard Manufactured with Variation of Press Time
Authors: de Campos Cristiane Inácio , Ferreira Bruno Santos , Christoforo André Luis , Rocco Lahr Francisco Antonio , Barbosa Juliana Cortez , Morales Elen Aparecida Martines , Oliveira Lima Felipe
Published: February 2015

This research aimed to produce and determine physical and mechanical properties of three-layered particleboard produced with Pinussp. wood particlesand three different times of press, i.e., 3, 5 and 7 minutes. Recommendations of the Brazilian standard ABNT NBR 14810 [1] were adopted to fundament physical and mechanical tests. The properties evaluated were the modulus of rupture (MOR) and modulus of elasticity (MOE) in static bending; internal bond; thickness swelling; water absorption; moisture content and apparent density.The mean values showed, for the physical properties, that all the panels manufactured achievedthe requirements of theBrazilian standard, and for mechanical properties, only the panelsmanufacturedwith 7minutesofpressing timemet therequirements. From the Tukey test results, timesof the pressingcycleinfluencedsignificantlyin allinvestigatedphysical and mechanicalproperties, showed better results the panels madewithseven minutesof the pressingcycle, implyingthat the time ofseven minutesof the pressingcycle is thebest among theinvestigatedperiodsin the manufactureofparticleboard.
Study on Influence to the Ceramic Glaze Color of Environmental-Friendly Pottery Brick by Low-Carbon Catalytic Combustion Furnace of Natural Gas
Authors: Ren Tian Qi , Fang Kai , Zhang Shi Hong
Published: February 2015

This experiment consists of two parts. On the one hand is about the concentration of Variation of exhaust gas when heated potteries .On the other hand is about the compared between the potteries (Tang Dynasty) heated by natural gas catalytic combustion furnace and the traditional firing of the glaze. The potteries fired by catalytic combustion furnace could be used for decorating are not only more fine and glossy than the traditional, but also more translucent. Therefore, the potteries made by catalytic combustion furnace will be applied in decoration industries, such as decorative murals.
Thermal Simulation Study on Copper Cooling Stave of Blast Furnace
Authors: Zhong Yi , Lu Xian Zhong , Fan Xiao Ming , Lei Chang
Published: February 2015

Using the finite element software ANSYS to establish thermal structure coupling model of copper cooling stave. Taking into account the cooling stave hot simulation of the boundary conditions, respectively to calculate the temperature distribution, thermal stress and deformation of rolled copper cooling stave and cast copper cooling stave embedded copper pipe under high temperature. The calculation results of temperature and heat stress show that the copper cooling stave could meet the requirements in the worst condition of blast furnace, and will not generate fatigue crack under high heat loading.
Fabrication and Characterization of Al/Ni Multilayer Films
Authors: Ma Tao , Zeng Qing Xuan , Li Ming Yu , Wang Tao
Published: February 2015

Self-propagating exothermic formation reactions have been intensively studied in a variety of reactive multilayer films, which typically include alternating layers of two or more reactants. Here, we introduce a reactive multilayer film which contains a thermite reaction between Ni and Al.Al/Ni multilayer films which were composed of alternate Al and Ni layers were prepared by DC magnetron sputtering.The total thickness of each films was approximately 1.2 μm having bilayer thicknesses of 60, 100, 150 nm. Each bilayer consisted of an aluminum layer and a nickel layer in a 3:2 thickness ratio to maintain an overall 1:1 atomic composition.Meanwhile, Al/Ni multilayer films with the bilayer thickness of 60 nmwas prepared. In each bilayer, the thickness ratio of Al to Ni was maintained at 1:2 to obtain an overall 1:3 atomic composition.The total thickness of Al/Ni multilayer films was around 1.2 μm.DSC curves show that the values of heat release in Al/Ni multilayer films with bilayer thicknesses of 60 (Al:Ni), 100 (Al:Ni), 150 (Al:Ni) and 60 (Al:3Ni) nm are 324.63 Jg-1, 348.51 Jg-1, 400.45 Jg-1 and 69.85 Jg-1, respectively. XRD measurements show that the final products of exothermic reactions with Al:Ni atomic ratio of 1:1 and 1:3 are the compound of AlNi and AlNi3, respectively.
Experimental Study on the Surface Cutting Mechanical Properties of Single Crystal Silicon in Micro-Nano Scale
Authors: Yang Xiao Jing , Li Yong , Zhang Wei Xing
Published: February 2015

The experiment of cutting mechanical properties of single crystal silicon surface in the micro-nanoscale is researched using nanoindenter and atomic force microscopy. The result of the experiment shows that: in the constant load, the impact of different scratching velocity for single crystal silicon surface scratch groove width and chip accumulation volume are not big; but the cutting force and friction coefficient are not increases with the scratching velocity increases; when the scratching speed is certain, the size of load has a greater impact on the cutting mechanical properties of single crystal silicon surface, with the increase of the load, the cutting force increases, but the cutting force is not linearly growth.
Energy Saving for Distillation Process of Mixture with Wide-Boiling Range via T-Q Graph
Authors: Li Yu Gang , Zheng Shi Qing
Published: February 2015

The temperature-heat duty (T-Q) graph method is provided to save energy for the distillation process of the mixtures with wide-boiling range. It is a visual method to find the heat sources and heat sinks, to use different utilities reasonably, and to realize the energy recovery, such as the steam generation or the heat integration. Through adjusting the operating pressures of some different column sections, the heat integration can be realized, and the multi-effect distillation flowsheet can be obtained. One case is studied and the result showed that the given method is easy and convenient for the engineers to design or to retrofit the distillation process in the interest of energy saving.
A Study on Modified Hough Algorithm for Image Processing in Weld Seam Tracking System
Authors: Lee Jong Pyo , Wu Qian Qian , Park Min Ho , Park Cheol Kyun , Kim Ill Soo
Published: February 2015

In modern market, achieving mechanical and automatic arc welding process is the key issue to be solved in welding industries. Because of the high complexity of the welding environment, manual detection of the weld line information is hard to be successful and time consuming. Therefore, this study aim at developing a new image processing algorithm for seam tracking system in Gas Metal Arc (GMA) welding by modified Hough algorithm based on the laser vision system. Firstly, noises in the captured weld seam images by CCD camera were effectively removed by noise filtering algorithm and then weld joint position were detected by the modified Hough algorithm to realize the automatic weld seam tracking. To verify the efficiency of the developed image processing model, a common image processing method was employed and the processed results were compared with the proposed algorithm. Statistical results proved that the modified Hough algorithm was able to acquire the weld information precisely with less computing time and memory cost, which also capable for industrial application.
Nonlinear Dynamic Finite Element Programming Design of Different Material Model
Authors: Ding Hui , Song Li
Published: February 2015

Based on the static elastic-plastic analysis program REPFPA, the impact of concrete material elastic-brittle-plastic damage model and its numerical test methods was studied. This paper has introduced the visualization technology, preparation of pre-processing related modules and graphical visualization display and many other functions into the nonlinear dynamic program, which is convenient for users to operate and view the results. And the numerical experiments of dynamic response of cantilever beam problems and spherical shell under step load elastic-plastic problems was produced. Compared with the results of other scholars and literature, we’ll verify the validity of the research in this paper.
Stability Analysis and Natural Frequency Calculation of Composite Cap-Beam
Authors: Jiang He , Zheng Bo
Published: February 2015

According to the Classical Lamination Theory, this paper deduced the effective flexural rigidity of Cap-Beam with the relationship between the internal force and strain when the beam are under the pure bending state, then use the effective flexural rigidity to deduce the axial critical load and the natural frequency of this beam, finally, use the finite element method to verify the formula , provide a reference for the application of the cap-type and other section types of composite beam in engineering.
Non-Destructive Detection of Lingwu Long Jujube Quality by Dielectric Spectroscopy
Authors: Wang Hui Qian , Zhang Hai Hong , Zhang Zhong , Ma Xue Lian
Published: February 2015

In order to detect Lingwu long jujube quality, the electrical parameters of Lingwu long-Jujube picked and stored at room temperature were measured dynamically with parallel plate measuring instrument HIOKI 3532-50 LCR. The variation of quality indicators such as pulp firmness, brittleness, total soluble solid (TSS) and moisture during storage were tested and analyzed. Regression equations of quality and under five appropriate test frequencies were established. Among the five test frequencies, 3.16 kHz was determined as the characteristic frequency. The results showed there is a strong correlation between long-Jujube quality and under the characteristic frequency. The method could be used for the jujube fruit quality detection, and can be extended to other fruits quality detection also.
Simulation of Citronellal Extraction Tower Based on Aspen Plus Software
Authors: Chen Qiu
Published: February 2015

Aspen Plus is a simulation system of large-scale generalized flowsheet. It is to describe the chemical process by using a digital model, and to obtain the desired results on the computer by changing various effective conditions. The main component with higher value in citronella oil is high purity citronellal. Due to its boiling point, temperature-sensitive and other issues, the difficulty of distillation process increases. This paper conducts process design and simulation on citronella oil high vacuum distillation process by using Aspen Plus software, obtains the process parameters of citronellal extraction tower, explores the relationship between reflux ratio and the number of theoretical plates, and provides data support for the continuous production of citronellal in citronella oil system.
Optimization of Experimental Conditions for the Preparation of High Specific Surface Area Bamboo-Based Activated Carbon
Authors: Zhang Sheng Zhou , Xia Hong Ying , Zhang Li Bo , Peng Jin Hui , Wu Jian , Zheng Zhao Qiang
Published: February 2015

Bamboo as the raw material is carbonized to prepare high specific surface area activated carbon by microwave heating under nitrogen atmosphere in our present work. Influences of activation agents on the preparation of activated carbon are studied. The results show that activation agents have a significant influence on the preparation of activated carbon. Under the heating time of 15 min, the adsorption capacity of the activated carbon prepared utilizing KOH as activation agent is the best. When the KOH/C ratio is 4, the iodine number and yield of activated carbon are 2298 mg/g and 39.82%, respectively. The BET specific surface area, total pore volume and average pore diameter of activated carbon are 3441 m2/g, 2.093 ml/g and 2.434 nm, respectively. The micropore volume of 1.304 ml/g is 62.30% of total pore volume, indicating that the activated carbon is microporous activated carbon.
Enhanced Absorption of Single Silicon Nanowire with Si3N4 Shell for Photovoltaic Applications
Authors: Liu Wen Fu , Hao Hua Li
Published: February 2015

Based on the Lorenz-Mie light scattering theory, we have calculated the light absorption of single silicon nanowire with Si3N4coating, and compared with pure single silicon nanowire. The calculated result indicates that there exists an enhanced absorption in the Si3N4-coated silicon nanowire and shows a great photocurrent enhancement factor (~70%) for the coaxial NW with the shell thickness of ~70 nm. For a special shell thickness (175 nm) in the Si3N4-coated silicon nanowire forr= 150 nm, the enhancement comes up to ~98.45%.
Immobilization of Acidic Ionic Liquid on Silica Gel for Catalytic Oxidative Desulfurization of Fuel Oils(II): Desulfurization
Authors: Cheng Kai Peng , Yang Hao , Wang Jian Hong , Liu Hui Peng , Qiao Cong Zhen
Published: February 2015

A series of highly dispersed ionic liquid catalysts were used for the oxidation desulfurization of dibenzothiophene (DBT) in model oil in the presence of H2O2. The effects of the loading of [BMIM]HSO4immobilized, reaction time, temperature, O/S molar ratio and the dosage of catalysts on DBT removal were investigated in detail. The catalyst with the loading of [BMIM]HSO4was 25% exhibited the highest activity. The DBT removal of model oil can reach 99.9% in 5 h at 60 °C, O/S molar ratio of 10, Vmodeloil=10mL, mcatalysts=2.00g. The catalysts can be easily recycled and can be recycled 2 times without a significant decrease in activity.
Study on the Fermentation of Fuel Ethanol from Corn Stover Pretreated by Propionic Acid
Authors: Chen Kun , Li Jun , Zhao Hua , Liang Nai Long
Published: February 2015

Simultaneous saccharification and fermertation (SSF) were studied to produce ethanol from corn stover, which include three continuous stages, stover pretreatment, cellulose fermentation, and ethanol production. Firstly, the crude was treated by propionic acid, and the disposal rate of lignin and hemicellulose in corn stover was 60.6%, 98.5%, respectively, with a residual rate of cellulose 90.68%. Then, cellulase production was carried out byTrichoderma reeseiRut C-30. 10% stillage and other nutrition were added to the pretreated corn stover, water moisture and initial pH were adjusted to 70% and 4.8, liquid inoculum was (1.7~2.0)×107spore/g stover. The stover was kept under 30°C for 7d, then mixed with equal pretreated stover. Ratio of water was 2, the inoculum was 3.2×107cell (Saccharomyces cerevisiae)/g substrate, After incubated at 36°C for 72h, the SSF process achieved a yield of ethanol (0.326g/g substrate).
Modification on ITO to Fabricate Low Work Function Electrode in Inverted Organic Photovoltaics
Authors: Deng Ming Zhang , Zhang Bing Yan , Huang De Kang , Chen Zhao , Chen Bing Bing , Li Shao Hui , Shen Yan , Wang Ming Kui
Published: February 2015

The PCE has a great relationship with the work function of conductors in organic and printed electronics devices. And organic photovoltaics require an electrode with a work function (WF) that is low enough to either facilitate the transport of electrons in and out of various optoelectronic devices or collect electrons from the lowest unoccupied molecular orbital (LUMO) of a given organic semiconductor. In inverted organic photovoltaics, the ITO is normally used as cathode to collect electrons .By using PDDA deposition, the surface work function of ITO can be decreased by 0.3 eV, which is able to improve the electrons transport and the PCE in OPV, as it has been proved that the surface electronic potential of ITO is very sensitive to the presence of self-assembled molecular layers.
Finite Element Analysis of Motor Box for EBZ160 Horizontal Roadheader
Authors: Miao Ji Jun , Long Ri Sheng
Published: February 2015

In order to solve the cracking and poor reliability problems of motor box of Horizontal Roadheader, the static structural FEA (Finite Element Analysis) of cutting arm & motor box of the EBH160 Horizontal Roadheader was conducted, and the stress and strain contours of FEA were obtained. By comparing the calculated results, the safety factor of cutting arm & motor box was 1.36, which provides a reference for the optimal design of cutting arm & motor box.
Preparation and Characterization of Castor Oil-Based Cationic Waterborne Polyurethane
Authors: Liu Kai , Zhang Song Ping , Su Zhi Guo , Ma Guang Hui
Published: February 2015

A variety of castor oil-based cationic polyurethane dispersions (PUDs) were synthesized. The effects of hard segment content on the properties of PUDs and the resulting polyurethane films were investigated by mastersizer, Fourier transform infrared (IR), thermal gravimetric analysis (TGA) and stress-strain test. As the hard segment content increased from 37.1 to 45.6 wt %, the particle size of the PUDs increased from 10 to 190 nm. IR analysis showed that hydrogen bonding between hard segments enhanced with the increase of hard segment content. For this enhancement the films had an increased tensile strength from 2.0 to 9.4 MPa and an improved glass transition temperature (Tg) from 48oC to 75oC. TGA showed the films were thermally stable up to 200oC and had biphasic degradation at around 330oC and 440oC. The versatile castor oil-based cationic waterborne polyurethanes are promising in applications as adhesives and coatings.
The Structure and Properties of UV-Curable Cationic Waterborne Polyurethane Acrylate
Authors: Meng Yi Ding , Li Hong Wei
Published: February 2015

A series of stable double-terminated UV reactive cationic waterborne polyurethane dispersions was synthesized, while the structure was confirmed by infrared spectroscopy,laser particle size analysis and free NCO root titration; modified by co-monomerhydroxyethyl acrylate with the UV radiation fast curing, the influence of hydroxyethyl acrylate proportion and the polyurethane’s nNCO/nOH(R value) to the thermal properties, mechanical properties and yellowing of the product was investigated. The investigation illustrated the UV-curable cationic waterborne polyurethaneacrylate film effectively forming a semi-interpenetrating network system to achieve rapid curing coating.The results showedthe product cured by WPU dispersion of R=1.5 mixed with equimolar HEA obtained lowyellowing, the maximum breaking strength, high elongation at break, high thermal decomposition temperature, high crystallization temperature of hard segment, low glass transition temperature of soft segment, high degree of phase separation, better overall performance.
The Influence of Crystallization on the Ionic Conductivity of PEO/LiClO4 Polymer Electrolytes
Authors: Wang Yu Feng , Zhang Xiao Can , Lu Gui Wu , Zhou Qiong
Published: February 2015

It’s generally accepted that the transport of lithium ions in solid polymer electrolytes exists mainly in the amorphous regions, thus the research has focused on reducing the crystallinity to obtain high conductivity at room temperature. However, the point has been challenged: crystalline systems can provide a better ionic conductivity. In this paper, PEO/LiClO4polymer electrolytes with different lithium-oxygen ratios were prepared by melt-blending. The results show that [EO]/ [Li+] = 3 system has higher ionic conductivity, 4.26×10-6S/cm, more than twice as that of [EO]/ [Li+] = 4 system. DSC and XRD results show PEO3:LiClO4crystalline phase present in both systems, the crystallinity of [EO]/ [Li+] = 3 system is higher. It illustrates the generally accepted mechanism is not suitable for these systems, suggesting the high conductivity of [EO]/ [Li+] = 3 system is due to the unique crystal structure of PEO3:LiClO4. Besides, as the crystallinity increases, the tensile strength of [EO]/ [Li+] = 3 system increases greatly, to 1.43 MPa. In addition, because of the high melt temperature of PEO3:LiClO4, the electrolytes will gain excellent heat resistance. In summary, this paper provides a new idea to prepare polymer electrolytes with high ionic conductivity, improved strength and excellent heat resistance in large scale.
Synthesis of Graphene Oxide Frameworks and their Application in Electrocatalytic Preparation of Hydrogen Peroxide
Authors: Zhou Li Na , Zhao Han , Liu Yuan , Li Jing , Shi Hao Fei , Wu Yong Gang , Wei Dong Shan
Published: February 2015

The electrocatalytic performance of graphene oxide frameworks (GOFs) for producing hydrogen peroxide is reported. Three different GOFs are synthesized by interlinking the graphene oxide sheets with different boronic acid deviates through the hydrothermal method and their electrochemical performance are investigated via cyclic voltammetry (CV) and rotating disk electrode (RDE) experiments. Through these electrochemical experiments, we find GOFs favor a 2e-reduction pathway and perform high activity and selectivity in the hydrogen peroxide production process. Taking advantage of these catalysts for the electrochemical synthesis of hydrogen peroxide has the potential to establish a safe, sustainable, and cheap flow-reactor-based production method.
Preparation of Silica Aerogels Modified Foamed Polypropylene for Thermal Insulating Applications
Authors: Su Li Fen , Zhang Wei , Xia Ru , Yang Bin , Miao Ji Bin , Qian Jia Sheng , Bao Jun Jie , Xu Ying
Published: February 2015

The foamed polypropylene (PP) with excellent thermal insulating property was prepared by using the nanosilica (SiO2) aerogels as nucleators, followed by mould pressing foam in cross-link. The weight ratio of SiO2/ PP, which was at the range of 0~ 2%, significantly affected the morphology and thermal insulating properties of the foamed PP. The results showed that the foamed PP can get excellent properties when the weight contents of SiO2aerogels was 1 %. The foamed PP with low density as 0.43 g/cm3and thermal conductivities at the range of 0.046~0.507 W.(m.K-1) was obtained by using this method.
Influence of Jet Velocities and Material Properties in Quenching of Metal with Array of Jets
Authors: Zhao Peng , Sabariman  , Specht Eckehard , Song Xin Nan
Published: February 2015

In this research work, the influence of jet velocities and different kind of metals during the quenching process with the use of array of jets was tested. Three different jet velocities i.e. 0.9m/s, 1.2m/s, and 1.8m/s were applied for the quenching of copper K12. Experiments with different kind of metals are using AA6082, Nickel, and Copper K12 samples. The influence of jet velocities and material properties was characterized by figuring out the trend of propagation of Leidenfrost Point (LFP) and maximum Heat Flux (maxHF) point over time. In addition, Leidenfrost Temperature (LFT), maxHF values with the corresponding DNB temperature as well as the width of wetting front over position were also presented. The results show that the jet velocities and the material properties significantly influence the boiling characteristics in a metal quenching process with array of jets.
Effect of Potential on Stress Corrosion Cracking of 321 Stainless Steel under Marine Environment
Authors: Dong Xi Qing , Li Mei Rong , Huang Yan Liang , Feng Li Juan , Cui Xin
Published: February 2015

Slow strain rate test (SSRT) applied with different potential was adopted to investigate the stress corrosion cracking (SCC) sensibility of stainless steel under marine environment. The fracture morphology of 321 stainless steel SCC specimens were analyzed with the aid of SEM. The strain-stress results showed that 321 stainless steel exhibited less SCC sensitivity when anodic potential or cathodic potential were applied on the specimen, both fracture elongation and fracture time ascended compared with that of corrosion potential. The fractography analysis results also proved this susceptibility clearly.
Corrosion Behavior and Microstructure of Pd Ions Doped Cerium Conversion Coating on AA2219-T87 Aluminum Alloy
Authors: He Yan Hong , Cui Zhen Duo , Yang Xian Jin , Zhu Sheng Li , Li Zhao Yang , Liang Yan Qin
Published: February 2015

In this paper, Pd ions doped cerium conversion coating (CeCC/Pd) was deposited on AA2219-T87 aluminum alloy by electroplating. The microstructure and composition of the coating were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). Corrosion behavior of AA2219-T87 aluminum alloy with the coating was investigated in 3.5wt.% NaCl solution at the room temperature. XRD and XPS results indicate the existence of cerium-oxide and palladium-oxide in the CeCC/Pd. Polarization curves show that the CeCC/Pd exhibits excellent corrosion resistance. The corrosion current density of the CeCC/Pd decreases by two orders of magnitude compared with the CeCC. The improvement of corrosion resistance would be attributed to the small grain size, good compactness and adhesive strength of the composite coatings.
NN '- Three the Two Amine Ether’s Synthesis and Help-Dye Application
Authors: Wang Lei , Zhou Bo
Published: February 2015

In this paper, based on triethanolamine on application effect of reactive dyes, the design of a new kind of dyeing assistant NN '- three the two amine ether, through the experiment, verify the dyeing assistant and good effect of reactive dyes with good fiber in dyeing process, has practical significance of application of reactive dyes.
Novel Microbial Based Low Energy Green Building Material Production Technology
Authors: Li Meng Meng , Kawasaki Satoru , Zhang Qiu Zhuo , Achal Varenyam
Published: February 2015

The present world cannot be imagined without construction industry. On other hand we are not able to prevent impact of construction on the environment due to usage of its key component that is cement, which plays a greater role in the emission of greenhouse gases. Every tonne of Ordinary Portland Cement (OPC) that is produced releases on average a similar amount of CO2into the atmosphere, or in total roughly 6% of all man-made carbon emissions. One of the purposes of research should be to lower the amount of cement during construction without compromising the quality of building structure. Microbial metabolic activities often contribute to selective cementation by biomineralization. In the present study, a novel microbial based low energy green building material based on microbially induced calcium carbonate precipitation (MICP) has been reported that is known as “biocement”. Biocement has enormous potential and usage in building materials and structures with potential to partially replace the cement. The research demonstrates that production of biocement can enhance the durability of building structures in addition to have least impact on the environment.
Thermal Impact Resistance of Integrated Thermal Protection System of Space Vehicles
Authors: Fan Xu Ji
Published: February 2015

Space vehicles which enter earth’s atmosphere require a thermal protection system (TPS) to protect them against aerodynamic pressure and heating impact. The use of material with high temperature capability in combination with low thermal conductivity, to limit transfer of heat into interior of the structure, is required of the TPS. Because these requirements cannot be accomplished by a single material layer, two material layers are proposed, and their functions are integrated through the TPS design. Future reentry vehicle’s capabilities will in great extent depend upon the capabilities of the materials used for these layers [1]. This paper is devoted to the protection layer of the TPS, to predict its strength and life under the aerodynamic pressure and heat impact loads.
Evaporation-Plastic Shrinkage-Cracking: Overview of Approaches and Discussion
Authors: Laroussi Zakaria , Abidi Moulay Larbi
Published: February 2015

Plastic shrinkage is a complex phenomenon to understand and to control. This volume contraction at early age is accentuate by aggressive climatic conditions (high temperature, windy weather, low humidity, etc...) and can lead to cracking, which affects the aesthetics and especially the durability of concrete.
This paper presents an overview of two principal approaches characterizing concrete plastic deformation:
The qualitative approach based on the study of shrinkage consequences and their interpretations in order to understand the behavior of concrete at this critical age,
The approach has been called quantitative is mainly founded on the quantification of the deformation capacity of the material and its comparison with plastic deformations.
Also, in order to enrich the discussion, this paper will present the remarks that we were able to notice, based on results in the literature.
A Methodology for Longitudinal Tooth Flank Crowning of the Helical Gear on a CNC Honing Machine
Authors: Tran Van The , Hsu Ruei Hung , Tsay Chung Biau
Published: February 2015

The gear honing is the most economical way for hard finishing an involute helical gear after hobbing and heat treatment or after shaving and heat treatment. The gear honing can also be applied to the modification of gear tooth surfaces to compensate for the distortions that occur during heat treatment process. Most published papers on the technology of gear honing describes on the principle of generated gear surface. However, the longitudinal tooth flank crowning of a helical gear with honing has not been investigated yet. Therefore, in this paper, we proposed a novel method for longitudinal tooth flank crowning of work gear surfaces by setting a crossed angle between the honing cutter and work gear axes as a linear function of honing cutter's traverse feed in the honing process. A mathematical model for the tooth profile of work gear honed by a standard honing cutter is also established. Three numeral examples are presented to illustrate and verify the merits of the proposed gear honing method in longitudinal crowning.
Laser Transmission Welding of Thermoplastic: Experimental Investigation Using Polycarbonate
Authors: Singare Sekou , Chen Sheng Gui , Zou Jian Jun , Li Nan
Published: February 2015

The use of lasers for joining plastics is growing. Several different approaches are being developed for laser welding of plastics. The main principle now used to laser-weld plastics is known as “transmission welding.” Transmission welding has demonstrated that precise, controllable heating and melting of low melting point thermoplastics can be produced at the interface between a transmissive and an absorptive plastic. [1-8]
Research on the Impact of Increase Pressure on the Homogeneity of the Cast in Die Casting Technology
Authors: Gaspar Stefan , Pasko Jan , Pavlenko Slavko
Published: February 2015

The production of die castings cast into a metal mold has in recent years achieved an expansive growth in the volume as well as the range of production and that is particularly in aviation and automobile industry. In the process of die casting the final quality of a cast is influenced by a great number of factors. The main factors of die casting are: pressing velocity, increase pressure, the melt temperature and the mold temperature. A primary criterion for achieving reliability, efficiency and quality of production is to ensure minimization of the castings defects occurrence in castings correct setting technological factors of die casting. The presented paper deals with the experimental assessment of the impact of increase pressure on the mechanical properties and homogeneity of a die cast.
Mechanical Properties Research of Planar K-Joint
Authors: Hu Xi Bing , Yi Fei Hua , Zhang Da Long , Mao Hui
Published: February 2015

The finite element models of the planar K-joint are established based on the finite element analysis software ANSYS. The bracing members are under the action of axial force and moment. Different rotational deformation values of the joint with different geometric parameters are reached with calculation and analysis. Results show that the deformation value approximate linearly increased with the increasing load of the bracing member. It also shows that the influence of the bracing member diameter and wall thickness is larger on rotational deformation values and the rotational deformation of the part of the K-joint is greatly influenced by the deformation of joint region.
Analysis on the Holistic Resistant Behavior of Super High-Rise Concrete Structure Affected by the Concrete Strength of the Core of the Joints
Authors: Yang Zhao , Wu Di
Published: February 2015

In the construction process of super high-rise structures, in order to simplify the construction process and ensure the construction quality, the construction team always make the concrete of joint core use the same strength grade with beams and plates, and pouring with them together. So that the concrete strength of joint core fail to meet the design requirement, whether the resistant behavior of the structure can be able to meet the design requirements is the key problem we focus on. In this paper, the finite element model of a super high-rise structure was established by MIDAS/GEN software, the holistic resistant behavior of the structure under the action of frequent earthquake was analyzed to study the effect of joint core concrete strength on the whole structure. The study provides the basis for further exploring a more reasonable pouring method of the concrete of the joints.
Influence of Internal Leakage in Hydraulic Capsules on Dynamic Behavior of Hydraulic Gap Control System
Authors: Kovari Attila
Published: February 2015

In hot rolling mills the plastic deformation of the strip is realized at high force and plastic strain speed controlled by electro-hydraulic servo actuators. These hydraulic servo actuators - hydraulic capsules – are capable to adjust the rolling gap at great rolling force dynamically. The dynamic behaviour of the rolling mill’s AGC (automatic gap adjustment) system mainly depends on the correct operation of hydraulic actuators and servo valves. These equipments are great value, planned maintenance is essential for reliable correct operation. The maintenance includes the refurbish of damaged, worn surfaces inside the cylinder and replacement of worn out seals. In the study a laboratory hydraulic positioning system was used to examine the effect of hydraulic actuator internal leakage to dynamic behaviors of the positioning system. Because the laboratory test system is similar to the hydraulic gap adjustment system therefore the laboratory test results can be extended to the rolling mill’s Hydraulic Gap Control system.
Behaviour of AlMg3 Base Material and its Friction Stir Welded Joints under Cyclic Loading Conditions
Authors: Lukács János , Meilinger Ákos
Published: February 2015

The friction stir welding (FSW) is a dynamically developing version of the pressure welding processes. Nowadays, the knowing of the properties and the behaviour of the welded joints is an important direction of the investigations, especially under cyclic loading. The research work aimed (i) to demonstrate the behaviour of the FSW welded joints under cyclic loading conditions; (ii) to confirm the applicability of the used friction welding technology. Experiments were performed on 5754-H22 aluminium alloy and its welded joints; both high cycle fatigue (HCF) and fatigue crack propagation (FCG) tests were executed. HCF limit curves were determined based on staircase method. Statistical behaviour of the base material and the welded joints under FCG was represented by the cutting of the specimens, in other words by the using of different crack paths. FCG limit curves can be determined by own developed six step method. The investigations and their results were compared with each other and with the results can be found in the literature.
Adjusting the Flexibility of Fabric Reinforced Composite Laminates Using Experimental Design
Authors: Molnar T. , Baranyai V. , Kemény S. , Bánhegyi Gy. , Szabó József
Published: February 2015

The objective of our work is to improve the mechanical stiffness of fiber reinforced laminates. The stiffness can be characterized by flexural and tensile moduli or their derivation. We applied design of experiments (DOE) to achieve our goals, because to solve the existing analytical and numerical models is complicated.We examined the effects of the following parameters: a) composition of reinforce materials (solely carbon, or carbon and glass combination), b) modulus of resin, c) mass ratio of resin-reinforcement, d) order of layers.The samples manufactured on the basis of DOE were investigated mechanically (flexural and tensile moduli measurements) and morphologically (scanning electron microscopy). We compared the measured modulus results to calculated values.
Recrystallization of Boron Containing and Boron-Free Low Carbon Steels Investigated by Thermoelectric Power and Hardness Measurements
Authors: Mucsi András , Dévényi László
Published: February 2015

The measurement of thermoelectric power is a powerful method to investigate the metallurgical processes occurring in steels. In this study, four low carbon cold rolled steel sheets having different composition were investigated. The cold rolled sheets were heated up at heating rate 20 °C/hour up to different temperatures, whilst the change of thermoelectric power and hardness have been measured at room temperature after slow cooling. The thermoelectric power of steels increases with temperature until the recrystallization finishes. The raise of thermoelectric power during recrystallization is ranging between 50 and 160 nV/K, depends on the composition of the sheet. Specimens consist of boron exhibit lower thermoelectric power after recrystallization than the steel without any boron, probably due to metastable borocarbide dissolution. This fact could be a good starting point to investigate the effect of boron on thermoelectric power of steels.
Surface Properties of Lightweight Aggregate Concrete and its Correlation with Durability
Authors: Nemes Rita
Published: February 2015

Durability is one of most important requirements of concrete design. From this aspect is arising the required minimal compressive strength class of conventional concrete in order to ensure durability. The porosity of cement mortar matrix and consequently the liquid and gas permeability of concrete may be reduced. But the strength of lightweight aggregate concrete depends primarily on the crushing resistance of lightweight aggregate (LWA). With low strength LWA may be achieved higher concrete strength by high strength cement mortar matrix. Therefore we can not consider durability simply on the basis of the compressive strength of concrete. The most important durability factors are closely related to the porosity and strength of the cement mortar matrix but for example the abrasion resistance depends more significantly on the aggregate type. Lightweight aggregates usually do not have high abrasion resistance, but they can be advantageous in case of restoration of bridge pavement. The most important factors of durability regarding pavements are frost scaling and abrasion resistance. These parameters (especially abrasion resistance) are not available in the literature when using LWA.
Characterisation of Hybrid Metal Matrix Syntactic Foams
Authors: Orbulov Imre Norbert , Májlinger Kornél
Published: February 2015

High quality aluminium matrix syntactic foams (AMSFs) were produced by pressure infiltration. This method can ensure the maximal volume fraction of the reinforcing hollow spheres and very low amount of unwanted or matrix porosities. By this method hybrid MMSFs with mixed metal and ceramic hollow spheres were also produced. The matrix material was AlSi12 alloy and two different types – produced by Hollomet GmbH in Germany – of hollow spheres were used: Globomet (GM) and Globocer (GC). The geometrical properties of the hollow spheres were similar (average outer diameter), but their base material was pure iron and Al2O3+SiO2 in the case of GM and GC hollow spheres respectively. The volume fraction of the reinforcing hollow spheres were maintained at ~65 vol%, but the ratio of them was altered in 20% steps (100% GM + 0% GC, 80% GM + 20% GC...). The results of the compression tests showed, that the compressive strength, yield strength, plateau strength, structural stiffness and the absorbed mechanical energy values increased with higher ceramic hollow sphere reinforcement ratio. The fracture strains of the investigated MMSFs decreased with the higher GC ratio. Generally the strength values also increased with higher diameter to height (H/D) ratio from H/D=1 to H/D=1.5 and 2.