bluuebunny/crossref_metadata_2025 huggingface dataset:
Nanostructured Morphology of Spinel LiMn2O4 Oxide under Microwave Heating
Authors: Huo Di
Published: June 2014

The surface morphology and structure of the cubic stoichiometric spinel LiMn2O4 powder prepared by microwave heating were examined using X-ray diffraction, scanning electron microscopy and transmittance electron microcopy. It is shown that the surface morphology of LiMn2O4 particle changed with increasing preparing temperature, while the crystal structure kept unchanged. Novel nanostructured morphologies including nanorods and nanowhiskers were formed under appropriate synthesis conditions. The growth mechanism of the nanostructured morphology of spinel LiMn2O4 was discussed in accordance with period bonding chains (PBCs) theory.
Study on Ag/SnO2/TiO2 Electrical Contact Materials Prepared by Liquid Phase In Situ Chemical Route
Authors: Zhu Yan Cai , Wang Jing Qin , An Li Qiang , Wang Hai Tao
Published: June 2014

In order to improve the machinability and electrical performance of the Ag electrical contact materials. A new kind of nano-Ag/SnO2-TiO2 electrical contact materials were prepared by liquid phase in-situ chemical route. The distribution state of elements titanium in copper and their effects on the microstructures and properties have been studied. The results of SEM show that SnO2-TiO2 powders are small, uniform and with no obvious phenomenon of reunion. At last, Ag/SnO2-TiO2 electrical contact materials were prepared by powder metallurgy method and electrical performance were done. Test results show that the electrical properties of Ag/SnO2-TiO2 are superior to the electrical properties of Ag/SnO2. Hence Ag/SnO2-TiO2 may become a new contact material which can replace Ag/SnO2.
Modeling of Recrystallization Texture of Rolled Polycrystalline Aluminium
Authors: Wierzbanowski Krzysztof , Kotra Michal , Wronski Marcin , Sztwiertnia Krzysztof
Published: June 2014

In many metallic materials the dominating recrystallization mechanism can be described by the oriented growth behavior. Phenomenological laws state that only these nuclei grow intensively which have a given misorientation with the deformed matrix. This description is frequently verified in f.c.c. metals and generally reported misorientations are between 300 and 500 rotations around the <111> axis. Basing on the above ideas the recrystallization model was formulated and applied to the study of recrystallization textures in rolled polycrystalline aluminium.
Numerical Analysis on Decay Heat Power of Weapon-Grade Uranium and Depleted Uranium
Authors: Wang Yu Ling , Yu Wen Li , Wang Tao , Dong San Qiang
Published: June 2014

In order to exactly master effect of uranium material’s heat power on safety and reliability of nuclear weapon, weapon-grade uranium(WgU) and depleted uranium(DU) were regarded as research object in this paper. According to their component, decay heat power of WgU and DU per kilogram was calculated through dynamic decay cascade and decay law of uranium. Decay heat power of WgU and DU was respectively 1.8152 and 0.4075 milliwatt per kilogram. Main nuclide influencing on decay heat power of WgU and DU is uranium-234(U-234).
First-Principles Investigations of Electronic, Dynamic and Thermodynamic Properties of α-MnO2
Authors: Hao Ai Min , Wang Na Qi
Published: June 2014

We investigate the electronic, dynamic and thermodynamic properties of α-MnO2 using first-principles calculations based on density functional theory (DFT) with the GGA+U method. The results of electronic structures show that α-MnO2is a semiconductor with a direct band gap of 1.4 eV at Γ point. The results of dynamic properties indicate that the structure of α-MnO2 is dynamically unstable at ground-state. Several important thermodynamic quantities, such as entropy, enthalpy and Gibbs free energy, et al each as a function of temperature were presented.
Te Inclusions in CdMnTe Crystal Grown by the Traveling Heater Method and their Effects on the Electrical Properties
Authors: Shen Ping , Zhang Ji Jun , Wang Lin Jun , Min Jia Hua , Huang Jian , Liang Xiao Yan , Tang Ke , Shen Min , Wang Lin , Xia Yi Ben
Published: June 2014

The concentration and size distribution of Te inclusions in CdMnTe (CMT) are key factors in nuclear devices performance. High-concentration and large-size Te inclusions degrade the performance drastically, especially for electrical properties. In this paper, the Te inclusions along the axial and radial directions in CMT crystal grown by the Traveling Heater Method (THM) were revealed by Infrared Microscopic System. The size of Te inclusions is 5-17 μm and the concentration is (2.5-4.6) ×105 cm-3. The Current-Voltage measurements were performed and the resistivity of the CdMnTe crystal with excess Te was in the range of 108-109 Ωcm, and the correlation between the Te inclusions and resistivity was investigated. The large size (>17 μm) and high concentration (4.5 of ×105 cm-3) Te inclusion decrease the resistivity of the CMT crystal seriously.
Curing Process of Epoxy Resin Using Low Molecular Polyamide 651 as Curing Agent
Authors: Han Chun Hua , Wang Lin , Zhao Dong Yu
Published: June 2014

In this paper low molecular polyamide 651(PA651) is used as the curing agent of epoxy resin. The optimum curing conditions and dosage of the curing agent are obtained by DMA and FT-IR analysis. Based on the dynamic mechanical temperature spectra of samples test, the best curing conditions are room temperature 2 hours, 70°C 2 hours, 125°C 2.5 hours and 150°C 1 hours (RT / 2 h + 70 °C / 2 h +125°C / 2.5 h + 150 °C / 1 h). The best dosage of curing agent PA651 is 50 wt %. Since the analysis of Fourier Infrared spectral verified that epoxy groups react completely, the curing conditions are the best curing process.
Synthesis of Bis(p-aminophenoxy)Dimethylsilane(p-APDS) and its Process Optimization
Authors: Chen Li Xin , Yang Fei , Yun Jin
Published: June 2014

Bis (p-aminophenoxy) dimethylsilane (p-APDS) was prepared by the reaction of p-aminophenol or 4-acetamidophenol with dimethyldichlorosilane in the presence of triethylamine or pyridine through four different means. The structure of diamines was examined by melting point apparatus, FT-IR and nuclear magnetic resonance apparatus 1H-NMR. The productivity, process and cost of four means were compared. The results showed that benzene as a solvent, triethylamine as acid, p-aminophenol and dimethyl dichlorosilane at 40°C for 4h is the most economical and reasonable process for synthesis of bis (p-aminophenoxy) dimethylsilane (p-APDS).
Characterization of Three Calcium Phosphate Microporous Granulated Bioceramics
Authors: Camargo Nelson H.A. , Franczak Priscila F. , Gemelli Enori , da Costa Bruna Ditzel , de Moraes Aury Nunes
Published: June 2014

The calcium phosphate microporous bioceramics, and hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP) biphasic compositions, in the granular form of microporous biomaterials, are research themes and present potential biomedical applications in rebuilding and repairing maxillofacial bone and tooth structure and in orthopedic applications. This is associated with microstructural characteristics of biocompatibility and bioactivity and osteoconductivity properties that these biomaterials offer when applied in vivo or in simulated environment. Another differential point of these biomaterials is the solubilization capacity that they present when applied in the biological environment. These compositions of calcium phosphates (hydroxyapatite matrix and/or β-tricalcium phosphate) allow for the gradual release of calcium and phosphate ions for the biological environment, which are absorbed and promote the formation of new bone tissue. These materials are also promising in applications in the field of traumatology as in the repair of traumatized bone tissue and drugs controlled release and bone structure treatments. The favorable results of these biomaterials as bone reconstruction matrix and drugs controlled release are associated with crystallographic characteristics, morphology, surface and solubility that these biomaterials present when in contact with body fluids. This work aimed to describe three types of calcium phosphate microporous granulated biomaterials. The biomaterials used were provided by the Biomaterials Group from Universidade do Estado de Santa Catarina - UDESC and are: hydroxyapatite, β-tricalcium phosphate and biphasic composition 60% hydroxyapatite/40% β-tricalcium phosphate. The Scanning Electron Microscopy technique (SEM) was used for carrying out the morphological characterization and microstructure studies of granulated biomaterials. The X-Ray Diffractometry (XRD) served for characterization of crystalline phases. Arthur Method was used for determining open porosity and hydrostatic density of biomaterials. The BET technique served to support determination of the surface area of microporous granulated biomaterials. The results are encouraging and show that these biomaterials present promising morphological characteristics and microporous microstructure as wettability and capillarity. These characteristics may contribute to biomaterial osteointegration by new tissue, bone formation and mineralization process.
Characterization of Different Nanostructured Bone Substitute Biomaterials
Authors: Levandowski Nelson , Camargo Nelson H.A. , Silva Daiara F. , Dalmônico Gisele M.L. , Franczak Priscila F.
Published: June 2014

The present research paper centers on physicochemical characterization of six nanostructured alloplastic bone substitutes developed at Santa Catarina State University (UDESC Brazil). In addition to identifying the main phases, the focus was to measure the morphological and microstructural features, which are believed to be crucial for controlling and guiding biological and molecular events. The studied samples exhibited rounded granules measuring 200μm 10(PO4)6(OH)2] was found as main phase for HAp, BCP and HAp/Al2O3 biomaterials. For HAp/TiO2n, HAp/SiO2n and β-TCP, the major phase was beta tricalcium phosphate [Ca3(PO4)2-β]. The results demonstrate that the presence of a second phase of nanometer order, at a hydroxyapatite bioceramic matrix, may modify the surface diffusion of the grains and the phase transformation kinetics of hydroxyapatite and beta tricalcium phosphate at temperatures up to 1100°C.
Sintering and Characterization of Calcium Phosphate Biomaterials Elaborated from Fossilized Calcareous Shell
Authors: Silva Daiara F. , Camargo Nelson Heriberto Almeida , Levandowski Nelson , Franczak Priscila F. , Schneider Mônica S.
Published: June 2014

Bioceramics of calcium phosphate, obtained from natural raw materials, are promising as bone substitutes because they exhibit crystallographic similarity with the bone tissue. This work deals with the sintering and characterization of calcium phosphate biomaterials from fossilized calcareous shells. Four compositions of biomaterials were prepared with Ca/P molar ratio ranging from 1.4 to 1.67. They were synthesized using a wet method and calcined at 900°C/2h providing calcium phosphate powder, then compressed into a metallic mould. The samples obtained from this compression were sintered at 1200oC for 2h. The biomaterials recovered from sintering were subjected to a microstructural characterization by scanning electron microscopy [SE and by X-ray diffraction [XR. Mechanical properties were determined by compression tests. Finally, the Arthur method was used for determining the hydrostatic density and open porosity from these biomaterials. The value of fracture strength was between 54 and 84 MPa for compositions 1.5, 1.67 and 1.6 molar and for composition 1.4 molar about 328 Mpa. The results also showed was the amount of open porosity which ranged between 35 and 54% with increasing Ca/P molar ratio. These studies demonstrate that the production of biomaterials from fossilized calcareous shells may be a new alternative to the production of biomaterials for bone reconstruction.
Preparation and Anti-Tumor Activity of Polysaccharides from Phellinus pini Mycelia
Authors: Liu An Jun , Sun Hong Chen , Chen Ying , Wang Wen Hang , Liu Cai Hong , Wang Yue Meng
Published: June 2014

Polysaccharides PSIand PSIIwere isolated from liquid-cultured mycelia of Phellinus pini. The average molecular weight: PSI36 kDa, PSII49 kDa; sulfate content: PSI5.25%, PSII0.65%; monosaccharide composition: PSIglucose, galactose and mannitose; PSIIglucose, mannitose and xylose. Anti-tumor activities of PSIand PSII(400 mg/kg·d, i.g.) were investigated in S180-bearing mice. Results indicated that PSIand PSIIsignificantly inhibited the growth of S180-solid tumors. PSIand PSIIeffectively protected immune organs (thymus and spleen) and increased activities of immune cells (NK cells, macrophages, T and B lymphocytes). Results suggest that polysaccharides PSIand PSIIfrom Phellinus pini have potential anti-tumor activities, which might attributed partly to their immunomodulatory properties.
Synthesis and Performance of pH-Sensitive Hydrogel Microspheres and In Vitro Evaluation as Potential Drug Carriers
Authors: Liang Yuan Yuan , Chen Tong , Cui Yu Qin , Tian Rui Qiong , Qi Tong Sheng , Shang Qing
Published: June 2014

To accelerate the response rate of smart hydrogels to the environmental conditions, a novel pH-sensitive hydrogel microsphere with the controlled shapes and sizes were developed. Such monodispersed microspheres were synthesized via free radical polymerization under the protection of a multilayer stability system. The pH-responsibility of hydrogel microspheres was tested with the hydrogel bulk as a control. In vitro release studies were conducted in the simulated gastric fluid and intestinal juice with bovine serum albumin (BSA) as a model drug. The large specific surface areas endowed hydrogel microspheres a faster pH-responsibility than that of bulk ones. Therefore, such microspheres showed potential applications as the oral protein drugs carrier.
Stress Analysis of the Hip Joint Endoprosthesis Ceramic Head for Different Values of Shape Deviations
Authors: Fuis Vladimír , Janicek Premysl
Published: June 2014

The paper deals with the problems of ceramic head of hip joint endoprosthesis destructions, and with assessing the impact of shape deviations of conical surfaces on the tensile stress under ISO 7206-5 loading. The failure of the hip joint endoprosthesis ceramic head has always traumatic consequences for the patient, since a part of or even the whole endoprosthesis has to be reoperated. Hence, it is desired to reduce the number of implant re-operations to the minimum. Therefore the computational modelling of the stress of the head was realised. The shape deviations of the ideal contact cone areas of the head and stem are parameters that significantly influence the tensile stress in the head and its reliability. The assumed shape deviations of the head’s and stem’s cones are macro shape deviations (different cone taper) and micro shape deviations (unevennes) measured using the IMS-UMPIRE equipment. The stress state in the ceramic heads was solved using the FEM and head’s failure probability is based on the Weibull weakest link theory [4, 5 and 9].
Preparation and Photocatalytic Performance Study of La-WO3 Co-Doping TiO2
Authors: Diao Xian Zhen , Zhou Dong
Published: June 2014

Butyl titanate as titanium source, anhydrous ethanol as solvent, glacial acetic acid as inhibitor, La-WO3/TiO2, La/TiO2, WO3/TiO2and pure TiO2 photocatalysts were prepared through sol-gel method; At the same time, both of which were characterized by infrared spectrometer and uv-vis spectrophotometer; With methyl orange as simulated target degradation material, heat treatment temperature、different dopants, etc. on photocatalytic performance influences of TiO2were studied by spectrophotometer. Experimental results show that doping can improve obviously the photocatalytic activity of TiO2. When calcination temperature is 500 ℃, dosage of catalyst is 0.25 g, pH is 1, and methyl orange concentration is 10 mg/L, La-WO3/TiO2 photocatalytic effect is best, and degradation rate is 46.18%.
Preparation of Doped TiO2 Responded to Visible Light
Authors: Zhou Yan Huai , Wang Xing He , Chen Jia , Pu Rui
Published: June 2014

Cu-N co-doped TiO2 powder was prepared by sol-gel method. The Powder was characterized by X-ray diffraction (XRD) and UV-Visible absorbance spectroscopy (UV-Vis). The X-ray results indicated that Cu-N co-doped has no effect on its anatase type. The UV-Vis results show that the absorb threshold has extend to visible-light, the absorbility of co-doped TiO2 is higher than that of pure TiO2, and the Photocatalytic activity has been increased.
Preparation and Characterization of Mesoporous Activated Carbon from Alligator Weed with H3PO4
Authors: Xu Hui Min , He Guo Fu , Shi Min Tao , Tu Jun , Liu Wei , Xiang Wei Ning
Published: June 2014

Alligator weed, containing ash of 8.56 wt.% (dry basis), is a low-cost and renewable material for preparing activated carbon (AC) by chemical activation. Yield and iodine number results of orthogonal experiments showed H3PO4 was the optimal activator comparing with NaOH and (NH4)2HPO4. And optimal condition was at impregnation ratio of 4 to 1 with the impregnation time of 6h, carbonization temperature of 873K and carbonization time of 1h. According to calculation of Brunauer-Emmett-Teller (BET), the surface area of P1 (AC prepared by H3PO4 under optimum condition) attained the value of 1100.720 m2/g. Calculated by Barrett-Joyner-Halenda (BJH), the total pore volume and average pore size of P1 were 0.610 cm3/g and 2.216nm. The rate of mesoporous range, as high as 72.00%, revealed P1 was mesoporous AC. FT-IR spectrum suggested P1 contained carboxyl, phenol, ether and other functional groups. XRD showed a graphitization degree of 65.12% indicating its high stability in application.
Optimization and Evaluation of Preparation Process of Activated Carbon Loaded ZrO2 Catalyst for Oxidative Desulfurization
Authors: Yang Chong , Hou Ying Fei , Liu Min , Guo Ning , Zhang Jian Hui
Published: June 2014

This paper studied how DBT oxidation was influenced by different preparation conditions of diesel desulfurization catalyst. Fuel oil oxidation and desulfurization technology has been studied by using solid superacid prepared by activated carbon loaded SO42-/ ZrO2 as catalyst instead of the traditional liquid acid, hydrogen peroxide as oxidant, in mild conditions. Impacting factors on removal sulfur have been investigated such as soaking time, burning temperature, burning time, active ingredient content and concentration of sulfuric acid, etc. The results show that soaking time is 6h, burning temperature is 500 °C, burning time is 2.5h, the mass ratio of the active ingredient is 3:100 ZrO2 and activated carbon, sulfuric acid concentration is 0.5mol/L. The desulfurization rate is over 93% and raffinate oil recovery can reach more than 86% under this optimum condition.
Hydrothermal Synthesis and Characterization of Hexagonal Mg(OH)2 Flame Retardant with Bischofite and NH3
Authors: Song Xue Xue , Li Li Juan , Liu Zhi Qi
Published: June 2014

Regular hexagonal plates of magnesium hydroxide with high slurry concentration were prepared by hydrothermal reaction without any organic additive or catalyst using bischofite and ammonia as raw materials. The effects of hydrothermal temperature, stirring speed, hydrothermal duration, and dilution multiple on the preparation of Mg(OH)2 flame retardant were investigated. Scanning electron microscopy, X-ray diffraction, and laser particle analysis were performed to characterize the product morphologies, structures, and size distributions. Results indicated that the growth direction of Mg(OH)2 crystal changed, and the regular hexagonal plates of Mg(OH)2 with uniform particle size and high dispersion characteristic formed after hydrothermal modification treatment. A mass fraction of 15.50% Mg(OH)2 of magnesium hydroxide slurry was obtained by high-concentration (4.30mol/L) magnesium chloride and ammonia as the raw materials.
Non-Isothermal Crystallization Kinetics of Semi-Aromatic Polyamide and the Preparation of its Fiber
Authors: Chen Yue Jun , Wu Ping Ting , Xu Hua Jun , Wang Dan , Wang Yi Min , Wang Yan Ping
Published: June 2014

In order to meet the new requirement of polyamide materials on the thermal behavior, the aromatic rings were introduced into the main chain to synthesize semi-aromatic polyamide. In this paper, the non-isothermal crystallization kinetics of semi-aromatic polyamide was studied with Mo method. It was found that the crystallization rate slowed down with the increase of crystallinity. Spinning experiments showed that the semi-aromatic polyamide fibers could be prepared by melt spinning. Heat treatment can improve the mechanical properties of the as spun fibers obviously. Considering the impact on the mechanical properties, heat treatment time under 60 min was optimum.
Phase Separation in Thermosetting Blends of Epoxy Resin with PS-b-PCL and PI-Si Block Copolymers
Authors: Ding Jin Dian , Li Wei Zhen , Jiang Tian Qi , Xia Zong Lian , Gan Wen Jun
Published: June 2014

Amphiphilic Diblock Copolymer Poly(styrene-b-ε-Caprolactone) were Synthesized. Firstly, Polystyrene was Synthesized via Sequential Atomic Transfer Radical Polymerization (ATRP), and then the Tetra Hydro Lithium Aluminum (LiAlH4) was Used as a Reducing Agent in Tetra Hydro (THF) to Reduce Polystyrene to the Pre-Polymer Monohydroxy-Terminated Polystyrene (PS-OH). as Following, Amphiphilic Diblock were Obtained by Ring Opening Polymerization. and the Structure of Diblock Polymer was Investigated by FTIR. Furthermore, the Block Copolymers were Added into the Mixture of Epoxy and me-THPA. and the Optical Microscopy(OM) Shows that the Microphase Separation Occured in this System and the PS-b-PCL can Promote the Phase Separation in the System.
Low-Cost Synthesis and Morphology Control of Magnesium Oxysulfate Hydrate Whiskers
Authors: Gao Chuan Hui , Ding Li , Wu Yu Min , Wang Chuan Xing , Xu Jun
Published: June 2014

A low-cost raw material, bittern obtained from the production process of sea salt, was used to prepare magnesium oxysulfate hydrate (MgSO4·5Mg (OH)2·2H2O, abbreviated as 152MOS) whiskers via hydrothermal synthesis with ammonia and magnesium sulfate as the other starting raw materials. The bittern was firstly filtered and then used directly without de-coloring. X-ray powder diffraction (XRD), transmission electron microscope (TEM), selected area electron diffraction (SAED), energy dispersive X-ray spectroscopy (EDX) and scanning electron microscope (SEM) were employed to investigate the composition and morphology of the products. It was found that the 152MOS whiskers synthesized from bittern at 190°C for 3 hours exhibited fanlike morphology. The formation of the fanlike whiskers was inhibited and most of the whiskers presented as single fibers when ethanol was used as crystal control agent in the hydrothermal process. From the two-dimensional steps observed at tips of the whiskers, a possible growth mechanism was speculated that it was the extension of dislocations that made the growth of the whiskers.
Analysis of Axial Holding Capability about the Lengthened Shrink-Fit Holder and Cutting Tool System
Authors: Li Jin Tao , Wang Shu Lin , Li Zhu Feng , Yu Yong Hui , Cheng Xue Liang
Published: June 2014

Lengthened shrink-fit holder is one important part of high speeding tool system. Its gripping rigidity directly affects the quality of the processed parts and machining efficiency. Building the FEA model of axial gripping rigidity about Lengthened shrink-fit holder and Cutting tool system with UG NX to analyze the influence with different interference,speed,gripping length and thickness on axial gripping rigidity. The gripping rigidity is one important parameter of the lengthened shrink-fit holder and cutting tool system, including radial griping rigidity,torsional griping rigidity and axial gripping rigidity,the reasonable interference of shrink-fit holder is obtained by contrasting three rigidity. Research provides a certain of theoretical guidance on the design of the lengthened shrink-fit holder and cutting tool system and choosing the reasonable processing parameters.
Cleaning Machine Design of Building Glass Curtain Wall
Authors: Zhang Rong , Li Hui , Chen Yan , Xiong Jun , Chen Chang Song , Ke Yu Ren , Hu Jun , Chao Ying Jun
Published: June 2014

This paper designs a new type of building glass curtain wall cleaning machine safely and effectively, which can replace artificial cleaning operations, This washing machine is mainly composed of crawling mechanism and cleaning mechanism designed through the modular design method.First of all, under the premise of correct and reasonable function decomposition,this article discuss about the overall movement scheme and control part design in sequence. Secondly,based on the 3 d design software Solidworks,the author built the virtual prototype model of building glass curtain wall washing machine in order to motion analysis and then ensure the rationality of the design.Finally,in view of the existing design, further improvements and optimization suggestions are presented , at the same time, the developing foreground of this machine was prospected.
Conformal s-Shaped Inlet Design and Flow Field Characteristics of Flying Wing Unmanned Aerial Vehicle
Authors: Zhang Le , Zhou Zhou , Wang Hong Bo
Published: June 2014

According to the stealth and conformal requirement of flying wing UAV(Unmanned Aerial Vehicle),an dorsal subsonic S-shaped inlet with long diffuser and large offset is designed. In the light of the characteristics of the inlet, new area distribution is created. In the study, the model with power system and the other model whose pipeline connected are established. The coupled numerical simulation is also carried out on the inflow/outflow integrated for flying wing UAV, and it is applied to study the longitudinal aerodynamic performance of UAV and the flow characteristics of inlet under different flight conditions. Results indicate: The longitudinal aerodynamic performance of the model with power system is close to the model with pipeline connected, but the moment characteristic of the former is better; The inlet characteristics are similar when Ma=0.5 and Ma=0.6; As the mach number increasing, the inlet performance decreases rapidly, Especially at the Ma = 0.7, there is a large low-pressure dominated region at the small angle of attack α = 2°, which leads to the total pressure recovery coefficient decreasing rapidly and the flow distortion increasing obviously.
Signal Testing System of Electronic Equipment Based on Bluetooth and LabVIEW
Authors: Zhou Xiao , Zhao Hai Yan , Liao Xiao Jian , Qiu Lei
Published: June 2014

In order to solve the problem of the routine signal measuring apparatus applied in a certain type of electronic equipment , a wireless signal testing system based on bluetooth technology and LabVIEW is proposed and designed. The hardware and software structure of the system is demonstrated. The key principle of data acquisition, wireless transmission, data processing and display are described. The wireless signal testing system is successfully applied with the advantage of high accuracy, real-time and portable.
Experimental Study on Detection Method of Micro-Fluidic Chip
Authors: Xi Zhang , Bo Wang
Published: June 2014

A fluorescent markers based two-dimensional parallel detection technique of Micro-fluidic chip is studied. In a special designed fluid field of test sample, excite fluorescence of micro-spheres probe by pulse-laser and employ high sensitivity CCD to catch it. The entire information from micro-fluidic chip can be obtained via a computer post-processing of the caught signal of fluorescence. Analyzed the probe flow state and fluorescence signal intensity of detection program. Established the expressions of fluorescence signal intensity and the parameters of detection system. Validation experiments indicate that this detection method has the advantages of rapid, accurate and high sensitivity.
Evolutionary Game Simulation of “Wave Phenomenon”
Authors: Meng Wei
Published: June 2014

According to the complex system multi-Agent modeling and simulation overall method, using the replication dynamic mechanism of biological evolution, under the condition of unknown number "participants", to establish a simple example of capacity and capacity in advance before production implementation after introducing oligopolistic competition among the enterprises in both cases the capacity of decision-making game simulation of evolutionary game model is set up, discuss the investment enterprises “blindly enter-into” in “the wave phenomenon”. Through distinguishing the cause of excess capacity as market and nonmarket factors, we think that to curb overcapacity in China should follow the overall train of thought.
Characterisation of Tool Coatings for Press Hardening
Authors: Müller Roland , Mosel André
Published: June 2014

Hot sheet metal forming is gaining in importance in many fields, because of its capability to produce more complex components than possible with cold forming. Hot forming is also used to influence the final material properties with the hot forming of manganese-boron steels being a good example. One of the major challenges in hot forming is the tribological conditions between the tool and sheet material at the required high temperatures. This article will discuss the influence of different tool material coatings, ranging from PVD to mechanically bonded ceramic coatings, on the tribological conditions during forming. It will also shed light on how these coatings influence the heat transfer between the component ́s material and the tool material.
Experimental and Numerical Investigations on Frictional Behaviour under Consideration of Varying Tribological Conditions
Authors: Merklein Marion , Zöller Fabian , Sturm Vera
Published: June 2014

In present time the FE-simulation of body parts in sheet metal drawing processes has to be continuously improved to increase the prediction accuracy. The objective of this paper is to describe a methodology to improve the simulation by mapping the complex tribological conditions of the process in the simulation. This methodology focuses on the dependency of influencing parameters on the friction coefficient. The influence respectively the dependency of these factors has been investigated, both in an experiment of a plane strip drawing test and in a FE-simulation of this test. With the sensitivity analysis in the numerical simulation it is possible to compare the implemented Coulomb-friction-model against the experimental results. The results of the experimental and numerical investigation show the need of further investigations on a more geometrical complex test to prove if it is possible to transfer the knowledge and dependencies that has been found in the experiment with the strip drawing test to a more geometrical complex test.
Affecting the Life Time of Roller Bearings by an Optimal Surface Integrity Design after Hard Turning and Deep Rolling
Authors: Denkena Berend , Poll Gerhard , Maiß Oliver , Neubauer Timo
Published: June 2014

The life time of roller bearings can be increased by inducing compressive residual stresses in the subsurface region of the raceway. These stresses can be induced by overloading in the first numbers of revolution. It would be much more useful to create the surface integrity within the manufacturing process. In this paper a method is presented to improve the process chain from grinding and honing to hard turning and deep rolling. As a result the surface finish is comparable to ground bearings. Due to the deep rolling process the maximum compressive stresses can be induced to higher values and depth. For the evaluation of the surface roughness in hard turning process and the maximum compressive stresses in deep rolling empirical models based on D-optimal experimental design are used.
Nanoscale Understanding of Bond Formation during Cold Welding of Aluminum and Steel
Authors: Altin Abdulrahman , Wohletz Simon , Krieger Waldemar , Kostka Aleksander , Groche Peter , Erbe Andreas
Published: June 2014

Cold welding, e.g. by cold forging, is a smart manufacturing technology, enabling novel multi material designs. A material combination, which is particularly attractive for manufacturing, though challenging to handle in a cold welding process, is steel and aluminum. We investigate the bond formation between cold forged C 15 (mainly primary heat treated) and AW 6082. Analysis starts with numerical simulations using the finite element analysis (FEA) to identify optimum conditions for bond formation. The bond strength was determined by tensile tests from samples eroded from the cold-welded specimen. Best performing samples showed a maximum tensile strength of ~200 MPa with ductile failure in the AW 6082. Transmission electron microscopy (TEM) inspection of the bonded area between aluminum and steel show a reaction layer consisting of iron and aluminum of few nm thickness throughout the sample. The formation of such a reaction layer is hypothesized to be crucial for bond formation.
Formation of Joining Mechanisms in Friction Stir Welded Dissimilar Al-Ti Lap Joints
Authors: Krutzlinger Markus , Marstatt Roland , Suenger Sahin , Luderschmid Johannes , Zaeh Michael Friedrich , Haider Ferdinand
Published: June 2014

Friction Stir Welding (FSW) is a suitable technology for joining dissimilar materials. As the process temperature during FSW typically does not exceed the solidus temperature, like in fusion welding, high quality joints can be produced with a minimum of intermetallic phases. A comprehensive description of the effective joining mechanisms of friction stir welded dissimilar material joints is still subject of research. In this study the results of an analysis of the effect of the pin length, which is supposed to have a significant influence on the characteristics of the joining mechanisms, are presented. Especially the influence on the bonding conditions and the mechanical properties of the joints has been investigated. For this purpose combinations of aluminum and titanium have been welded with varying pin length at different rotational speeds. The experiments show that at a sufficient distance between the interface zone and the pin tip the bonding is realized by a substance-to-substance bond and microscopic form-fit. As this distance decreases, a visible macroscopic form-fit is generated. However, this macroscopic form-fit causes no significant elevation of the joint strength. First scanning transmission electron microscopy (STEM) images reveal an interfacial layer, which indicates a diffusion of the two materials.
Wear Characterization of Nodular Cast Iron Based on Clusters of Nodules
Authors: Paredes-Orta Carlos A. , Manriquez-Guerrero Federico , Torres-González Julieta , Castañeda Federico , Terol-Villalobos Ivan R.
Published: June 2014

In this paper a study of wear behavior on nodular cast irons of the automotive industry is carried out. In different sections of two automobile parts, wear tests were performed using a tribometer pin-on-disk. Then, we calculated the density of nodules, volume fraction and nodularity without finding a relationship with the wear behavior. However, based on the concept of clusters of nodules, that integrate spatial distribution and size, we find that they play a major role in the wear behavior.
Synthesis and Mechanosynthesis of N, N’-bis (thylthyenil)-2,3-butanediimine with Corrosion Inhibitor Properties
Authors: Perales Liliana Hernández , Jardínez Christiaan , Vázquez García Rosa Angeles , Coreño Alonso Oscar , Veloz Rodríguez M. Aurora , Cruz Borbolla Julián , Coreño-Alonso Juan , Pandiyan Thangarasu , Hernández Cruz Leticia E. , Martínez García Marcos
Published: June 2014

In this work, we report the conventional and mechanochemical synthesis of the a-diimine derivate of 2, 3-butanedione and the primary amine 2-aminoethanethiol designated DD-DC and DD-DC/MS respectively. The products were characterized by 1H and 13C-NMR, FT-IR, MS-EI and elemental analysis. The products were also electrochemically evaluated by potentiodynamic polarization technique in order to measure their corrosion inhibition efficiency on AISI 1018 steel, immersed in a corrosive solution type NACE TM 0177. The results indicate that the compound obtained under mechanosyntesis conditions, DD-DC/MS, presents better inhibitory properties with 53% efficiency at 10 ppm concentration. On the other hand, the compound obtained by conventional synthesis (DD-DC) presented efficiency of 29% at 10 ppm concentration. Also, the DFT results show that a-diimine derivatives possesses corrosion inhibition properties, consisting of the transfer of high-charge density which in the delocalization region (N=C–C=N) is formed by p (C=N) and SH, these moiety play an important role, because their electron lone pairs help to form a protective coating to form an adsorption layer. The results showed that cysteamine compound turns out to be a good corrosion inhibitor for the steel iron surface in an acid medium forming an adsorption film over metallic surface.
Applied-Information Technology in Design of Ontology Integration of Clinical Medicine and Diagnosis System Based on Knowledge Management
Authors: Zhang Ming E , Zhang Hui
Published: June 2014

Study on the clinical medical knowledge engineering, aims to build a large-scale, shared, reusable medical knowledge base, so as to provide the intelligent expert system of medicine, medical information retrieval system, medical education, medical natural language understanding etc.. In this paper, based on ontology integration technology, proposes an ontology integration of clinical medical knowledge management and computer-aided diagnosis system framework based on distributed ontology integration, and the technologies related to the knowledge management system is researched deeply, proposes a distributed ontology integration method based on semantics, in order to solve the information can not be shared between distributed information the distribution system and the problem of ontology integration, build a semantic platform can share the definition, design distributed ontology integration adapter, a reduction algorithm was proposed for distributed ontology integration relation, the ontology integration, reduce the redundant relation integrated ontology language, improving the quality and efficiency of ontology integration.
Application of BP Neural Network and GPRS in Design of Supply Water Management Information System in Campus
Authors: Kuang Guo Fang , Sun Yi Bo , Fan Gang Long
Published: June 2014

The prediction problem of water according to the characteristics of campus, the general steps combined with neural network modeling method, BP neural network was selected as a basis for modeling. In this paper, the monitoring system GPRS technology and campus water supply network are combined, and the establishment of a burst pipe fault analysis model. The paper presents application of BP neural network and GPRS in design of supply water management information system in campus. Experimental results show that the proposed method has high efficiency.
Experimental Study on Dilution Ratio of Laser Cladding of Al2O3-13 % TiO2 Ceramic Coating
Authors: Wang Dong Sheng , Qu Guang , Su Jin Lan
Published: June 2014

In this study, Al2O3–13 wt% TiO2ceramic coating was prepared on the substrate of a GH416 Ni-base superalloy by squash presetting laser cladding. The effects of processing parameters on dilution ratio were investigated. The result shows that the coating consists of two zones: the ceramic clad zone and dilution zone. The dilution ratio increases with the increase of laser power, whereas, the dilution ratio decreases with the increase of laser beam moving velocity. However, the coating with a low laser power is difficult to obtain metallurgical bonding to substrate, and with a high moving velocity can easily produce pores. The clad ceramic coatings characterized by a dense structure, no cracks, low dilution, and good metallurgical bonding to substrate were obtained under optimum processing parameters.
TEM Specimen Preparation of GaN Thin Films
Authors: Li Cui Yun , Cao Jun
Published: June 2014

Cross-sectional TEM observation can be used as an important method in the microstructure investigation of thin films. However, the specimen preparation for cross-sectional TEM observation is generally regarded as a challenging task. In this paper, we discussed the preparation of TEM cross-sectional specimens. An example from GaN thin films grown on Si substrate was discussed correspondingly.
Fault Diagnosis of Wind Turbines Based on Improved Neural Network
Authors: Lan Qiang , Zhao Peng Da , Wang Man Li
Published: June 2014

The gearbox is an important module of wind turbine. In order to diagnosis the fault of wind turbine gearbox, a method based on the improved neural network is proposed. According to the characteristics of the wind turbine gearbox, several vibration sensors are set in the gearbox, so as to acquire the feature vector of gearbox. After training, the improved neural network is verified with some test samples. The result proved that the method is suitable for fault diagnosis in gearbox of wind turbine.. Keywords: wind turbine gearbox, fault diagnosis, particle swam, neural network.
Manufacturing Execution System Design Using ISA-95
Authors: Govindaraju Rajesri , Lukman Kristianto , Chandra Dissa R.
Published: June 2014

Manufacturing execution system is information systems (IS) that bridges the gap between IS at the top level, namely enterprise resource planning (ERP) nd IS at the lower levels, namely the automation systems. MES has been reported to increase productivity, maintain product quality, and reduce production time. However, the advantage is obtained if MES is integrated smoothly with the other systems. Currently there is an industry standard, ISA-95, which can be used as a reference model in the process of integrating MES with ERP and automation systems. This study was undertaken to propose a methodology for MES design utilizing ISA-95 standard.The methodology is designed considering the objectives of MES development from a point of view manufacturing system and also from the point of view of information systems. Thus, challenges from two domains, namely business (manufacturing) domain and technology (IS domain) are both considered in the development of the methodology.
A Vide Survey on Product Development and Commercialization Process
Authors: Salman Roba Radi , Hammouda Yaser A.A. , Monsef Sanaz , Sadeghi Mohammad
Published: June 2014

The purpose of this paper is to focus on new Product Development (NPD) and Commercialization Process based on previous researches since 1963. We intend the articles to serve two major goals. Firstly, we hope that it will be useful for researchers and postgraduate students who are interesting in understanding of commercialization process for NPD. Secondly, this article is useful for R&D managers to understand how can commercialize a new product. Finally the practical implementations of each article along with its findings as major factors for impacting on NPD process are presented in a table on discussion and result part.
Analysis of Thickness Strain Prediction in Warm Deep Drawing of Ti-6Al-4V Alloy
Authors: Kotkunde Nitin , Deole Aditya D. , Gupta Amit Kumar , Singh Swadesh Kumar
Published: June 2014

In this work, deep drawing experiments have been performed in order to study formability of Ti-6Al-4V alloy sheet at temperature ranging from room temperature to 4000C. It is found that below 1500C, formability of the material is very poor and above 1500C till 4000C, limiting draw ratio (LDR) is found to be 1.8 which is substantially lesser than other structural alloys such as austenitic stainless steels. In order to understand qualitative aspects of formability, thickness distribution of drawn cup has been evaluated experimentally over a temperature range of 1500C - 4000C. Additionally, Finite Element (FE) analysis is done using a commercially available code Dynaform version 5.6.1 with LS-Dyna version 971 solver. 3-Parameter Barlat yield model is used for FE analysis. Predicted thickness distribution using FE simulation is in good agreement with experimental results.
The Investigation of Microstructures Fabrication on Quartz Substrate Employing Electron Beam Lithography (EBL) and ICP-RIE Process
Authors: Shamsuddin Liyana , Mohamed Khairudin , Maryam Alsadat Rad
Published: June 2014

The fabrication of micro or nano-structures on quartz substrate has attracted researchers' attention and interests in recent years due to a wide range of potential applications such as NEMS/MEMS, sensors and biomedical engineering. Various types of next generation lithographic methods have been explored since optical lithography physical limitations has hindered the fabrication of high aspects ratio (HAR) structure on quartz substrates. In this research, the top-down fabrication approach was employed to fabricate microstructures on quartz substrate using Electron Beam Lithography (EBL) system, followed by the pattern transfer process using Inductively Coupled Plasma-Reactive Ion Etching (ICP-RIE) technique. The factors that influenced pattern definition include the type of electron beam (e-beam) photoresist, e-beam exposure parameter such as spot size, working distance, write field, step size, e-beam current, dosage as well as the type of developer and its developing time. The optimum conditions were investigated in achieving micro or nano-structures. Field emission scanning electron microscopy (FESEM) with energy-dispersive X-ray (EDX) and atomic force microscope (AFM) were utilized to characterize the structures profiles.
Finite Element Prediction of Mechanical Behaviour under Bending of Honeycomb Sandwich Panels
Authors: Sid-Ali Kaoua , Amar Mesbah , Boutaleb Salah , Azouaoui Krimo
Published: June 2014

This paper outlines a finite element procedure for predicting the mechanical behaviour under bending of sandwich panels consisting of aluminium skins and aluminium honeycomb core. To achieve a rapid and accurate stress analysis, the sandwich panels have been modelled using shell elements for the skins and the core. Sandwich panels were modelled by a three-dimensional finite element model implemented in Abaqus/Standard. By this model the influence of the components on the behaviour of the sandwich panel under bending load was evaluated. Numerical characterization of the sandwich structure, is confronted to both experimental and homogenization technique results.
Evaluation of Spur Gear Pair on Tooth Root Bending Stress in Yawing Misalignment Contact Condition
Authors: Lias Mohd Rizal , Awang Mokhtar , Rao T.V.V.L.N. , Fadhil M.
Published: June 2014

This paper evaluates the effects of yawing misalignment contact on the tooth root bending stress values of spur gear pair during the gear meshing cycle. A model basedon involute 3DparametricCAD geometry, of spur gear design ISO 6336:2006 is analyzed with worst loading position when yawing misalignment (Y) exist due to assembly error (AE) between 0.20 to 0.40 in degree scale values. Finite-element method (FEM) with dynamics module from ANSYS is used in order to calculate the tooth root bending stress (TRBS) at the critical region with respect to face width of pinion and gear section. A comparison is made between standard high point single tooth contactmodels (HPSTC) to this model as verification. Further analysis showeda good agreement that these methodologies are adequate in order to conduct a real time dynamics simulation to define the value of TRBS in Y condition due to AE. Yawingmisalignment influence factor (YMIF) was introduced as an indication of TRBS values in consideration of Y due to AEshows a higher result for pinion, give a good justification that the pinion is weaker compared to the gear in Y condition.
The Effect of Co/Pd MgO Supported Catalyst Calcination Temperature on the Yield and Morphology of CNTs via Methane Decomposition
Authors: Allaedini Ghazaleh , Tasirin Siti Masrinda , Sahari Jaafar , Meor Talib Meor Zainal
Published: June 2014

Co/Pd bi metallic catalyst supported on MgO has been prepared by sol gel method, at different calcination temperatures of 250 and 550 C. They were introduced in to the reactor for 5 hrs of reaction. The CNTs were collected. The obtained CNTs were characterized by XRD and SEM and the yield was observed. It has been concluded that the catalyst calcined at higher temperature will lead to higher yield and more uniform and smaller diameter CNTs.