Journal articles: '+665.117'

1

Cao, Ri Hong, Ping Cao, and Hang Lin. "Crack Coalescence and Failure Patterns in Brittle Rock-Like Specimens with Pre-Existing Fissures under Uniaxial Loading: Experimental Studies." Key Engineering Materials 665 (September 2015): 117–20. http://dx.doi.org/10.4028/www.scientific.net/kem.665.117.

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In practical engineering, the joints or fissures with similar characteristics are commonly found in natural rocks, they decrease the mechanics properties of the rock mass and also can be seen as a source of initiation of new discontinuities. The previous studies (experimental or numerical) has promoted the understanding of coalescence patterns or failure process obtained from brittle specimens which contain single, two or three fissures. However, the failure characteristics of multi-fissure specimens has not been studied comprehensively. In this paper, the crack coalescence pattern and failure mode of the rock-like materials with multi-fissures have been explored. Based on the experiment results, under unaxial compression, we found that the coalescence modes between fissures can be generally classified into three categories: T/S/M pattern. Moreover, due to the difference of inclination angle and fissure numbers, the specimens present different failure mode. Careful examination all of specimens, the failure mode can be classified into 4 categories: Mix failure model(shear+splitting), Shear failure, Stepped path, Intact failure.

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Luebert, Federico, Andrés Moreira-Muñoz, Katharina Wilke, and Michael O. Dillon. "Phylogeny and evolution of achenial trichomes in the Lucilia-group (Asteraceae: Gnaphalieae) and their systematic significance." Taxon 66, no. 5 (October 24, 2017): 1184–99. http://dx.doi.org/10.12705/665.11.

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Ochyra, Ryszard, Halina Bednarek-Ochyra, and Vítězslav Plášek. "(2550) Proposal to conserve the name Plagiomnium against Orthomnion and Orthomniopsis (Bryophyta: Mniaceae)." Taxon 66, no. 5 (October 24, 2017): 1218–20. http://dx.doi.org/10.12705/665.17.

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4

Godfrind-Haber, Jacqueline, and Maurice Haber. "L'expérience agie partagée." Revue française de psychanalyse 66, no. 5 (2002): 1417. http://dx.doi.org/10.3917/rfp.665.1417.

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Shukla, S. P., Haresh S. Patel, K. D. Patel, and V. M. Pathak. "MoSe₂/Polypyrrole Solar Cell." Advanced Materials Research 665 (February 2013): 112–17. http://dx.doi.org/10.4028/www.scientific.net/amr.665.112.

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MoS possesses a band gap around 1.4 eV which is nearly to maxima of solar radiations. The investigations on this kind MoSbased photovoltaic cells having the rectifying interface with polypyrrole. It was observed that MoS/polypyrrole structure exhibits a photovoltaic behaviour. The photoconversion efficiency and fill factor of above cell is calculated, the maximum photoconversion efficiency is 0.089 and fill factor is 0.5.

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Siddhapara, Kirit S., and D. V. Shah. "Synthesis, Structural, Optical, and Magnetic Properties of Fe Doped TiO₂ along with Different Concentration." Advanced Materials Research 665 (February 2013): 118–26. http://dx.doi.org/10.4028/www.scientific.net/amr.665.118.

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Nanocrystalline Fe-doped TiO2 was prepared by Sol-Gel technique, which was followed by freeze at-30°C temperature for 12hrs. The obtained Gel was thermally treated at 200,400,600 and 800°C. X-ray Powder Diffraction (XRD), Scanning Electron microscopy (SEM), UV-Vis Spectroscopy, Photo luminescence (PL) and EDAX was used to study its Structural and Optical properties. All Fe-doped TiO2 nanostructures show an appearance of Red shift relative to the bulk TiO2. The XRD pattern show the coexistence of major anatase phase and minor brookite phase for samples treated up to 600°C. Whereas at 800°C rutile is the only phase observed. All Fe doped TiO2 nanostructures show an appearance of Red shift relative to bulk undoped TiO2. The magnetic property by Gouy Balance of Fe doped TiO2 exhibit Peramagnetism at room temperature.

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Paul, Somnath, Arnab Gangopadhyay, and A. Sarkar. "Characterization of Gd₂O₃ Nano Clusters." Advanced Materials Research 665 (February 2013): 127–31. http://dx.doi.org/10.4028/www.scientific.net/amr.665.127.

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Gadolinium (Gd) is a weak magnetic element at room temperature. Gadolinium oxide (Gd2O3) is a poor semiconductor with para-magnetism. In this work Gadolinium oxide is prepared from the thermal dissociation of Gadolinium acetate. The average cluster size is found to be dependent on the number of the sintering time. In this present work an attempt has been made to characterize the developed Gadolinium oxide. Experimental probes used to characterize it are optical absorbance (UV-VIS); Fourier transformed infra red (FTIR) spectroscopy, DC current voltage characteristics (CVC) and photo-sensitivity studies of the developed specimens. Gadolinium oxide exhibits a good optical sensing property.

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Hu, Chun Lian. "Corrosion Resistance Dependence of Rare Earth NiCrMoY Alloy Coatings." Applied Mechanics and Materials 665 (October 2014): 107–10. http://dx.doi.org/10.4028/www.scientific.net/amm.665.107.

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The wear and corrosion of rare earth NiCrMoY alloy manufactured by atomization and oxygen-acetylene flame spray and high frequency induction remelting technique are investigated by a combination of scanning electron microscopy (SEM), energy spectrum, X-ray diffraction meter (XRD), uniform corrosion method of laboratory immersion test, anodic polarization curve of three electrodes potentiodynamic scan. The results indicate that Corrosion rate of NiCrMoY alloy coatings is better than that of Ni60A coatings in HCl, H2SO4, HNO3 and artificial seawater, and its wear is much better than those of Ni60A coatings.

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Huang, Ying, Xiao Ming Shen, and Xiao Feng Wei. "Simulation of InAIN/Si Single-Heterojunction Solar Cells Using wxAMPS." Applied Mechanics and Materials 665 (October 2014): 111–14. http://dx.doi.org/10.4028/www.scientific.net/amm.665.111.

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In this paper, InAlN/Si single-heterojunction solar cells have been theoretically simulated based on wxAMPS software. The photovoltaic parameters, such as open circuit voltage, short circuit current, fill factor and conversion efficiency were investigated with changing the indium content and thickness of n-InAlN layer. Simulation results show that the optimum efficiency of InAlN/Si solar cells is 23.1% under AM 1.5G spectral illuminations, with the indium content and thickness of n-InAlN layer are 0.65 and 600nm, respectively. The simulation would contribute to design and fabricate high efficiency InAlN/Si solar cells in experiment.

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Kang, Zhe, Ting Xiao, Xin Yu Tan, Peng Xiang, and Li Hua Jiang. "A Novel Nickel/Iron-Layered Double Hydroxide for Supercapacitors." Applied Mechanics and Materials 665 (October 2014): 115–18. http://dx.doi.org/10.4028/www.scientific.net/amm.665.115.

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A facile one-step method of growing nickel/iron layered double hydroxide (Ni/Fe-LDH) films with nanosheet structures on Ti sheet is presented and the electrochemical performance is investigated. Cyclic voltammogram of Ni/Fe-LDH electrode shows a pair of well-defined redox peaks at-0.4~-1.4 V, which is quite different with the previous reports on LDHs used for supercapacitors. This result implies the Ni/Fe-LDH may be an alternative for the cathode of the asymmetric supercapacitors.

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Hao, Ji Yan, and Hai Tao Liu. "Fabrication and Microstructure of Ge-Sb-S-CsCl Chalcogenide Glass Containing β-GeS₂ Nanocrystals." Applied Mechanics and Materials 665 (October 2014): 119–23. http://dx.doi.org/10.4028/www.scientific.net/amm.665.119.

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we report the fabrication and microstructure of Ge-Sb-S-CsCl chalcogenide glass containing β-GeS2 nanocrystals. A Ge-Sb-S-CsCl chalcogenide base glass with the better crystalline ability is first fabricated by melt-quenching method, and a further careful thermal process has led to the formation of β-GeS2 nanocrystals in the glass. Transmission electron microscopy showed that the size of β-GeS2 nanocrystals with nearly monodisperse spherical shape ranges from 30 to 45 nm in the glass. Powder X-ray diffraction results confirm that the β-GeS2 nanocrystals are of high crystallization with orthorhombic phase. Energy dispersive spectroscopy is employed for the information of nanocrystals glass composition. It is worthwhile to note that the obtained Ge-Sb-S-CsCl chalcogenide glass containing β-GeS2 nanocrystals still keeps higher transmittance in mid- and far- infrared spectral region.

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Zhu, Ping Hua, and Yi Lei. "Research on Strength Properties of Concrete Using Aggregates from Repeatedly Recycling Concrete Waste." Applied Mechanics and Materials 665 (October 2014): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amm.665.147.

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The strength properties of recycled aggregate concrete (RAC) using aggregates from repeatedly recycling concrete waste were studied. The relationships between cube compressive strength and splitting tensile strength and between each strength and replacement ratio of recycled aggregate to natural aggregate were established. The results showed that the strength properties of RAC with the design strength of 30MPa can be satisfied when the quality of recycled coarse and fine aggregates met respectively the needs of Grade II in GB/T25177-2010 and Grade III in GB/T25176-2010, with the replacement ratio to natural coarse aggregate and natural fine aggregate no more than 70% and 50%. Both strengths decreased and then increased for a while before descending again with increasing replacement ratio of recycled coarse aggregate, and decreased continuously with the increase of replacement ratio of recycled fine aggregate. The relationship between cube compressive strength and splitting tensile strength of RAC was found to be exponential function.

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13

Jeong, Jin A. "Cathodic Prevention and Cathodic Protection of Zinc Mesh Sacrificial Anode for Reinforced Concrete in 15% Salt Water." Applied Mechanics and Materials 665 (October 2014): 167–71. http://dx.doi.org/10.4028/www.scientific.net/amm.665.167.

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This study is to acquire the confirmation data regarding the cathodic protection and cathodic prevention characteristics for concrete piles in marine bridges and piers exposed to harsh marine environments. It was possible to confirm the performance of cathodic protection by the measurement of potentials and current density the concrete pile specimens applied with zinc mesh sacrificial anode cathodic protection system. The current density for the cathodic protection (CProt) that CP started after a repair of corrosion was higher than that for the cathodic prevention (CPrev) that CP commenced from the beginning of experiment, and 4 hour depolarization potentials were higher in the CPrev system than in the CProt one, and it was confirmed that the CPrev has more protection effect with less protection current, comparing to the CProt.

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14

Buonsanti, Michele, Fortunato Ceravolo, Giovanni Leonardi, and Francesco Scopelliti. "Interfaces Behavior in Glued Granular Materials." Key Engineering Materials 665 (September 2015): 113–16. http://dx.doi.org/10.4028/www.scientific.net/kem.665.113.

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In this paper a micro-scale model to investigate the structural integrity of a runway surface has been developed. By performing stress analysis on a representative volume element (RVE), our model specification has been focalized on two elementary mixture constituents, two rigid components glued together by asphalt. The analysis is performed under thermo-mechanical actions, as those produced by landing gear impact and variable high surface temperatures. Three different interfaces (rigid to rigid, rigid to soft and soft to soft), three different asphalt density and two different values of surface temperature have been considered in the simulation. Resulting stress and strain fields are compared to define the greater critical conditions and to evaluate the micro-scale structural integrity

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15

Shah, Syed A. A., and Syed T. Hasan. "Predicting Micro-Mechanics Damage Behaviour at a Metal-Ceramic Interface in a Reinforced Alloy." Key Engineering Materials 665 (September 2015): 137–40. http://dx.doi.org/10.4028/www.scientific.net/kem.665.137.

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The performance of metal matrix composites (MMCs) depends critically on the quality of the matrix-reinforcement interface. The nature of the interface in turn depends on the processing of the MMCs. At the micro-level, local concentration gradients around the reinforcement are being developed during processing and due to the metal matrix attempting to deform during deformation which can be very different to the nominal conditions. This plays a crucial role in the development of micro-structural events such as segregation and precipitation at the matrix-reinforcement interface. Micro-deformation characteristics of matrix reinforcement interface are modelled using commercial FE software and compared with analytical and experimental data. A method of calculation has been applied to predict the interfacial fracture strength of aluminium silicon carbide (Al-SiC) with 20% Vol fraction. Preliminary results show that the model succeeds in predicting the trends in relation to segregation and intergranular fracture strength behaviour in these materials. The proposed hypothesis will help the design engineers to select and use the materials in structural/load bearing applications. Interfacial strengthening characteristics will in turn give more accurate life predictions of such smart composite systems.

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16

Kaselouris, Evaggelos, Emmanouil Skarvelakis, Ioannis K. Nikolos, Georgios E. Stavroulakis, Yannis Orphanos, Efthimios Bakarezos, Nektarios A. Papadogiannis, Michael Tatarakis, and Vasilios Dimitriou. "Simulation of the Transient Behavior of Matter with Characteristic Geometrical Variations & Defects Irradiated by Nanosecond Laser Pulses Using FEA." Key Engineering Materials 665 (September 2015): 157–60. http://dx.doi.org/10.4028/www.scientific.net/kem.665.157.

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The thermomechanical transient response of matter illuminated by nanosecond laser pulses is modeled and simulated using the Finite Element Analysis (FEA). Matter’s behavior is numerically described by a three-dimensional (3D) multiphysics, coupled thermal structural, transient FEA, experimentally validated, model. FEA offers substantial insights into the materials’ micro-mechanical behaviour providing detailed information for the spatiotemporal evolution of acoustic waves. In this computational approach the impact of the geometric characteristics of the modeled metallic films to the generation and propagation of the ultrasonic waves, in relation to temperature, is investigated. The study is expanded to the dynamic reactions of matter in the presence of surface and solid volume defects and enclosures e.g.: gaps, holes or bubbles. The transient behavior of matter in the time and the space solution domains is obtained by the FEA model and presented.

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17

Zhang, Yu, Wei Wei Gao, Shi Xian Xu, and Meng Lan Duan. "The Research about the Strength of Composite Riser Pipes Based on Finite Element Method ." Key Engineering Materials 665 (September 2015): 177–80. http://dx.doi.org/10.4028/www.scientific.net/kem.665.177.

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Composite riser pipes are being paid more and more attention because of its lightweight and high strength comparing with the steel riser pipes. It mainly includes internal liner, elastic shear layer, structural composite overlap layers, external protective sleeve and additional composite layer and so on. In this paper, the mechanical analytical model of composite riser pipe is constructed. The equivalent material properties are obtained in the globe analysis, and from the local analysis, it found that the helical layers mainly bear bend loadings, and the hoop layers mainly bear internal pressures from the simplified composite joint local analysis. It is proved that the composite riser pipe has the excellent designability.

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18

Hara, Tomoaki, Hideaki Katogi, and Kenichi Takemura. "Effect of Resin Particle on Interfacial Shear Strength of CF/MAPP after Immersion." Key Engineering Materials 665 (September 2015): 197–200. http://dx.doi.org/10.4028/www.scientific.net/kem.665.197.

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Authors have reported that interfacial shear strength of Carbon Fiber (CF)/Maleic Anhydride grafted PolyPropylene (MAPP) was decreased by immersion for four weeks. As next stage, the purpose of this study is improvement of interfacial shear strength of CF/MAPP after immersion by adding resin particles around fiber. CF and resin particles added CF (RCF) were used as reinforcement. The major axis length of ellipse of resin particles was less than 5μm. In water absorption test, CF/MAPP and RCF/MAPP were immersed in distilled water for four weeks at room temperature. Micro debonding tests of CF/MAPP and RCF/MAPP after immersion were conducted. Fracture morphology of interface between fiber and resin was observed by using scanning electron microscope. As a result, following conclusions are obtained. In case of immersion for four weeks, the interfacial shear strength of RCF/MAPP was greatly increased (70%) compared with that of CF/MAPP. From fracture morphology of RCF/MAPP after immersion, some resin particles on CF surface were found after micro debonding test. Therefore, interfacial shear strength of CF/MAPP after immersion was increased by the effect of resin particles on CF surface.

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19

Zou, Jian Lai, Zi Li Kou, Chao Xu, Pei Wang, Shuai Yin, and Yong Li. "Sintering of Frustum Shaped Polycrystalline Diamond Compact at Non-Hydrostatic Pressure." Applied Mechanics and Materials 665 (October 2014): 11–16. http://dx.doi.org/10.4028/www.scientific.net/amm.665.11.

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This work present the study of the sintering of polycrystalline diamond compact with hyperbolic truncated cone profile using hexagonal boron nitride assembly, rather than salt mold, which is different from conventional assembly and this kind of polycrystalline diamond compact is widely used in percussion rock bits and roller cone rock bits. The well-sintered polycrystalline diamond compact without transition layer is prepared on a WC-10wt% Co substrate at temperature 1450°C for 3 min at non-hydrostatic high pressure of 5.5Gpa.Different analyzing techniques, such as X- ray diffraction, micro-Raman spectroscopy, scanning electron microscopy were applied to characterize the micro-structure, residual stress and sintering behavior. The SEM analysis indicates that diamond-diamond (D-D) direct bonding had formed in the polycrystalline diamond layer. The Raman spectroscopy shows compressive stress in the polycrystalline diamond layer is much higher than that sintered using traditional assembly.

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20

Liu, Jie. "Experimental Research on Fabrication Process of Metal Powder for SLS." Applied Mechanics and Materials 665 (October 2014): 17–20. http://dx.doi.org/10.4028/www.scientific.net/amm.665.17.

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In this paper, Vibration-suspense-type process is used to develop a new material, metal or porcelain powder coated with resin or ceramic powder, then it can be sintered and formed without large-power laser. One set of vibration-suspense-type powder-coating equipment is developed and powder material suitable for SLS can be prepared with the equipment. The moving status and the moving process of powder granule in the vibration-suspense-type process are also analyzed. Based on the equipment, Polystyrene-Al powder material, which is suitable for SLS, is successfully prepared. And the optimum process is discussed.

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21

Korlos, Apostolos, Orestis Friderikos, Dimitrios Sagris, Constantine David, and Gabriel Mansour. "Experimental Analysis of Ti6Al4V Orthogonal Cutting." Key Engineering Materials 665 (September 2015): 17–20. http://dx.doi.org/10.4028/www.scientific.net/kem.665.17.

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The chip formation mechanism in orthogonal cutting is a phenomenon that attracts the attention of many researchers. This paper investigates experimentally the orthogonal cutting of Ti6Al4V at different cutting conditions aiming at the understanding of the chip formation mechanism. Serrated chip formation is obtained during orthogonal cutting of Ti6Al4V in a wide range of cutting speeds. The results are analyzed in order to extract useful indices relevant to chip geometry, as the adiabatic zone angle and other dimensions that describe the serrated chip. The cutting forces and the acoustic emission are measured. Finally, by the aid of 3D Computed Tomography (CT) the chip morphology is analyzed to better understand the segmentation process.

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22

Pinzón-M., Conchita A., Victor R. Townsend, Jr., and Neis Martínez-H. "New record for the genus Platymessa Mello-Leitão, 1941 in Colombia, with the description of a new species (Opiliones, Cosmetidae)." ZooKeys 665 (April 3, 2017): 59–70. http://dx.doi.org/10.3897/zookeys.665.11371.

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23

AMORIM, DALTON DE SOUZA, and LENIRA GUIMARmES PINTO. "First known male of Enicoscolus (Diptera: Bibionidae), with a redescription of E. brachycephalus." Zootaxa 665, no. 1 (October 1, 2004): 1. http://dx.doi.org/10.11646/zootaxa.665.1.1.

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A male of Enicoscolus is described for the first time. Enicoscolus brachycephalus is redescribed based on two males and one female of E. brachycephalus from Mexico, found in the collection of the American Museum of Natural History, New York. The general pattern of the male terminalia is similar to other Bibionini. Sternite 9 is largely fused to the gonocoxites, which slightly projects distally to the hypandrial plate. The gonostyles are simple, rounded at the apex, differing from the usual Bibiodes bifid pattern or the curved gonostyle found in most Bibio species. A pair of aedeagal plates the tegmen and the genital rod follow the general pattern of Bibionomorpha species. The position of Enicoscolus is as the sister group of Bibionellus.

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24

Wang, Jiang Tao, and Zi Ru Lian. "Synthesis and Antibacterial Activity of Acylated Chitosan." Materials Science Forum 663-665 (November 2010): 1107–10. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1107.

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Chitosan, a biocompatible, biodegradable, nontoxic polymer, is prepared from chitin, which is the second most naturally occurring biopolymer after cellulose. Sorbyl chitosan and p-aminobenzoyl chitosan were synthesized working under high-intensity ultrasound and their antimicrobial properties were analyzed against Escherichia coil, Staphylococcus aureus and Aspergillus niger. The structures of the derivatives were characterized by FTIR spectroscopy and elemental analysis. The results indicated that the products had the effect of bacteriostasis and the antibacterial activity increased with increasing the concentration. Acylated chitosan had better inhibiting effect on S. aureus than others. It was also found that the antifungal activities of the derivatives were stronger than that of chitosan.

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Pan, Liu Zhan, Chao Liang Ding, Zhi Guo Zhao, and Xiao Yuan. "Influence of Polarization on the Spectral Changes of Stochastic Electromagnetic Pulsed Beams." Materials Science Forum 663-665 (November 2010): 113–17. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.113.

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An analytical expression for the spectrum of stochastic spatially and temporally partially coherent electromagnetic Gaussian Schell-model pulsed (GSMP) beams is derived, and used to study the spectral changes of electromagnetic GSMP beams in free space. The influence of polarization on the on-axis relative spectral shift is emphasized. It is shown that the on-axis relative spectral shift increases with increasing the degree of polarization of source P0 for the case of δxx≠δyy, i.e. the spatial coherence length δxx of x component of the electric field at the source is not equal to that of y component. For δxx=δyy or δxx→∞ and δyy→∞, the on-axis relative spectral shift is independent of P0.

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Liu, Han Chen, Xiang An Yan, Chang Jun Zhu, Cai Juan Xia, Hua Wa Yu, Jun Fang Wu, and Guang Shen Xu. "Measurement of Absorption Spectrum of Media by Grating Spectrometer." Materials Science Forum 663-665 (November 2010): 1137–41. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1137.

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In order to measure quantum yield (quantum efficiency) of light in the research of fluorescence excitation, rapid prototyping of micro-structure and photochemical, the absorption spectrum must be precisely measured. Therefore, the reflection on optical media interface, absorption and transmission in the medium must also be considered. In this article, we exhibit a set of reasonable experimental method which is designed to measure absorption spectrum by grating spectrometer. The results show that the obtained absorption lines are properly reliable if we select an appropriate way to settle the sample. Furthermore, it can be well generalized and applied to the selection of fluorescence excitation spectrum, photochemical reaction spectrum, photoelectric device spectrum.

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Sun, Jun Sai, and Cun Ying Xu. "Preparation and Characterization of Nickel Complex [Ni(1-MeIm)₆(BF₄)₂] in Ionic Liquid." Materials Science Forum 663-665 (November 2010): 1167–70. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1167.

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Nickel complex [Ni(1-MeIm)6(BF4)2, 1-MeIm = 1-methylimidazole] has been prepared in 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim]BF4) ionic liquid by a simple solution phase method. The complex was characterized by elemental analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared absorption spectroscopy (IR) and thermal analysis. SEM image indicates that the complex is irregular platelets with an uneven thickness in nanometer scale and variable transverse and longitudinal size, from 0.6 to 4 μm.

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Guo, Yan Qing, Rui Huang, Jie Song, Xiang Wang, and Yi Xiong Zhang. "Nanocrystalline Silicon Films Grown at High Pressure in Very High Frequency Plasma Enhanced Chemical Vapor Deposition System." Materials Science Forum 663-665 (November 2010): 1171–74. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1171.

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Nanocrystalline silicon films have been fabricated from SiH4 diluted with H2 in very high frequency (40.68 MHz) plasma enhanced chemical vapor deposition system at low temperatures (250oC). The influence of pressure on the structural properties of nanocrystalline silicon films has been investigated. The experimental results reveal that a very high hydrogen dilution is needed to crystallize the film grown at high pressure. If the hydrogen dilution is not high enough, the film could also be crystallized through lowering the pressure. Furthermore, the crystallinity and grain size increase with decreasing the pressure. These results could be attributed to the increase of ion bombardment energy and the higher atomic hydrogen flux toward the growing film surface at lower pressures.

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Zhang, Kai, Li Yu, Zhi Xin Lu, and Gang Song. "Synthesis and Characterization of Silver Nanoparticles Coated Titanium Dioxide Nanowires." Materials Science Forum 663-665 (November 2010): 1175–78. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1175.

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For the sake of investigating the special optical character of heteronanostructures, we grow TiO2 nanowires following a three step synthesis method and coat silver nanoparticles on these nanowires with replacement method. Firstly, by adjusting the experiment parameters, we get the single crystalline titanium dioxide nanowires and control their length and diameter successfully. Secondly, we use the replacement method to make the silver nanoparticles coated on these nanowires. Finally, we use transmission electron microscopy and X-ray diffraction to characterize these productions and the results show that the silver nanoparticles are coated on the titanium dioxide nanowires uniformly and the components of these nanowires are only sliver and titanium dioxide. These new optical heteronanostructures are widely investigated all over the world and we sure that they can make great influences to the development of nanophotonics.

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Tang, Yuan He, Tong Peng, Lin Qin, Xiao Dong Duan, Ou Yang Qu, Xian Gang Cao, and Qi Jie Jia. "Study of the Dynamic Modulation Transfer Function of Modified Super-Wide-Angle Sagnac Imaging Interferometer." Materials Science Forum 663-665 (November 2010): 1179–82. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1179.

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Modulation transfer function (MTF) is an important parameter for one image system. In order to obtain the more imaging quality performance of the modified super-wide-angle Sagnac imaging interferometer (MSASII) put forward by our group, and also have a qualitative analysis of its advantages and disadvantages in the process of application. Its dynamic MTF is focused on in this paper. The dynamic MTF expression of the MSASII is calculated. According to earlier research parameters of the MSASII, the dynamic MTF curve is described and corresponding corrective measures in theoretical is given. The result is demonstrated that the imaging quality of MSASII could satisfy the need of detecting upper atmospheric wind field.

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Chu, Jun Fu, Yi Hua Hu, Hai Wang Yin, and Yi Wu Hao. "Controllable Luminescent Properties of Phosphors Sr_2.97-XCa_xMgSi₂O₈: Eu_0.01²⁺, Dy_0.02³⁺ by Adjusting Sr/Ca Ratio." Materials Science Forum 663-665 (November 2010): 118–24. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.118.

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Divalent europium and trivalent dysprosium co-doping in the compounds Sr2.97-xCaxMgSi2O8 (x=0, 0.5, 1.5, 2, 2.5, 2.97) produces phosphors of high luminescence yield. These phosphors were prepared at high temperature and weak reductive atmosphere. The ratio of Eu/Dy is 1/2. The phosphors were characterized for their crystal phases by x-ray powder diffraction. Slight shifts of the peaks in the structure, which indicate a small change of the interplanar crystal spacing, were observed for each different x’s. The interplanar spacing becomes narrow as increasing the value of x. These phosphors respond well to the ultraviolet excitation. The peak of the emission band occurs at progressively longer wavelength and widens as the ratio of alkaline earth Sr/Ca ions is decreased. The emission peaks of the phosphors indicated on the emission spectra range from 463nm to 490nm. It is probably due to the influence of 5d electron states of Eu2+ in the crystal field because of atomic size variation causing crystal defects. Dy3+ ion doping in the phosphor generates deep traps, which results in long afterglow phosphorescence. As the proportion of Ca in the composition increases, the attenuation time of the phosphors becomes short.

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Cheng, Yan Hai, Zhen Cai Zhu, Zheng Tong Han, and Yong Zou. "Phosphorus Content Dependent Sliding Wear Behaviors of Electroless Ni-P Deposits." Materials Science Forum 663-665 (November 2010): 1187–91. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1187.

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In this work, the deposits of electroless Ni-P deposits prepared by different process were studied by means of EPMA, mirohardness tester, friction-wear instrument. The experimental results showed that the microhardness of the deposits was directly affected by the phosphorus content, which was depended on the processes of electroless. The friction-wear tests showed that the Ni-P deposits composing of less phosphorus content exhibited lower friction coefficient before and after being heat treated. The conclusion was drawn that the lower phosphorus content deposits could improve the wear resistance under the condition of both as-plated and after being heat treated Ni-P deposits. The wear behavior was typical of a pure adhesive wear mechanism for the high phosphorus content deposit at as-plated and after being heat treated at 200oC. However, for the high phosphorus content deposit after being heat treated at 400oC, the alternate friction mechanisms were emerged from adhesive wear to abrasive wear with the precipitating of hard Ni3P particles during Ni-P deposits suffering friction tests

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Liu, Chang Jiu, Chun Xiao Xing, Shi Juan Chen, and Yan Wei Li. "Structure and Electrochemical Performance of Amorphous Nickel Hydroxide Doped with La and Al." Materials Science Forum 663-665 (November 2010): 1217–20. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1217.

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Amorphous nickel hydroxide powders doped with rare earth La3+ and Al3+ were synthesized by the combined chemical precipitation and rapid freezing method. The microstructure of the samples was characterized by XRD and Raman spectra. The electrochemical performance of the prepared samples was analyzed by electrochemical impedance spectroscopy and charge-discharge tests. The results showed that this amorphous nickel hydroxide codoped with La3+ and Al3+ had more structural defects than those of the undoped amorphous nickel hydroxide and La3+ singly doped amorphous nickel hydroxide. These abundant structural defects with La3+ and Al3+ codoped amorphous nickel hydroxide decreased the electrochemical impedance spectroscopy and improved the electrochemical reversibility of the amorphous nickel hydroxide electrode.

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34

Sun, Jia Yue, Wei Hang Zhang, Yu Jing Lan, and Hai Yan Du. "The Luminescence Properties of BaGd₂(MoO₄)₄: Eu³⁺, Er³⁺, Yb³⁺ Phosphors." Materials Science Forum 663-665 (November 2010): 137–40. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.137.

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Two-color emission phosphors BaGd2(MoO4)4: Eu3+, Er3+, Yb3+ have been synthesized by the high temperature solid-state method. The as-prepared BaGd2(MoO4)4: Eu3+, Er3+, Yb3+ phosphors can emit intense red light under 395 nm UV excitation, while it will show bright green light upon 980 nm infrared light excitation. It is found that the red emission peaks at 595 and 614 nm should be attributed to 5D0-7F1 and 5D0-7F2 transitions of Eu3+, respectively. The green emission peaks centered at 532 and 553 nm under 980 nm excitation, are attributed to Er3+ transitions from 4H11/2 -4I15/2 and 4S3/2-4I15/2, respectively.

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Yu, Quan Mao. "Influence of Flux on Morphological and Luminescent Properties of Y₃Al₅O₁₂:Tb³⁺ Phosphor." Materials Science Forum 663-665 (November 2010): 177–82. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.177.

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The Y3Al5O12: Tb3+ phosphors are synthesized by solid-state reaction method using fluxes of LiF, NaF, MgF2, AlF3, CaF2, SrF3, KH2PO4 and complex fluxes of LiF+AlF3, KH2PO4+LiF separately. The influence of fluxes on phosphors morphology and luminescent properties are investigated by SEM, HITACHI F-450 photometer and cathodoluminescent photometer. The results indicate that KH2PO4 can improve the morphology characteristics of the phosphors, but LiF, AlF3, NaF, MgF2, SrF3, CaF2 are unavailable. LiF, NaF, AlF3, KH2PO4 can improve the phosphors photoluminescent intensity more than 20 percent and cathodoluminescent intensity more than 10 percent. Using KH2PO4 as flux, excellent luminescent properties and well dispersed ~2 m spherical or sub-spherical YAG: Tb3+ phosphors can be synthesized under 1500 oC.

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36

Zhang, Yu Hui, Ji Xin Su, Xiao Peng Wang, Qi Pan, and Wen Qu. "Photocatalytic Performance of Polyoxometallate Intercalated Layered Double Hydroxide." Materials Science Forum 663-665 (November 2010): 187–90. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.187.

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Based on X-ray diffraction results, the gallery height of modified Mg3Al-LDH was expanded to 9.6Å from the original 4.8Å, indicating that the H3PW12O40 was indeed inserted into the hydroxide layers. Moreover, the results of FT-IR spectra proved the Keggin structure of PW11O397- species. The resulting material showed a high activity of degradation of methyl orange in the presence of H2O2 and UV light irradiation.

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37

Sarojini, K., H. Krishnan, Charles C. Kanagam, and S. Muthu. "Molecular Structure, Vibrational Spectroscopy and Homo, Lumo Studies of 4-methyl-N-(2-methylphenyl) Benzene Sulfonamide Using DFT Method." Advanced Materials Research 665 (February 2013): 101–11. http://dx.doi.org/10.4028/www.scientific.net/amr.665.101.

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The sulfonamide compound, 4-methyl-N-(2-methylphenyl) benzene sulfonamide has been synthesized and characterized by FTIR, NMR, UV-Vis, single crystal X-ray diffraction and thermal analysis. Density functional (DFT) calculations have been carried out for the title compound by performing DFT level of theory using B3LYP/6-31G (d,p) basis set. The calculated results show that the predicted geometry can well reproduce the structural parameters. Predicted vibrational frequencies have been assigned and compared with the experimental IR spectra and they support each other. In addition, atomic charges, frontier molecular orbitals and molecular electrostatic potential were carried out by using density functional theory (DFT/B3LYP) 6-31G (d, p) basis set. The calculated Homo and Lumo energies show that charge transfer occur in the molecule.

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38

Wang, Lei Gang, Ya Ting Xu, Jian Fen Zhou, and Yao Huang. "Research on the Surface Topography Model of Galvanized Steels in Sheet Metal Forming." Applied Mechanics and Materials 665 (October 2014): 102–6. http://dx.doi.org/10.4028/www.scientific.net/amm.665.102.

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Due to the induced effect of plastic deformation and markedly influence of contact friction, the surface topography of galvanized steels has changed along with time and space during the sheet metal forming. WykoNT1100 non-contact optical profilometer was used to measure the surface topographies of different deformation zones in Erichsen cupping test. And the surface topography models of different deformation zones were established based on the statistical method. The results indicated that the surface topography was roughened with the increase of deformation and the degrees of roughening in different deformation zones were different. The function curve of micro-peak height in punch fillet zone which had serious deformation was relatively flat. It indicated that the data distributions were scattered, the roughness values were large and the zinc coating was severely exfoliated. However, the function curve in vertex zone was lanky with centralized data, small roughness values and intact zinc coating. Moreover, the surface topography was also affected by the contact friction.

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Budzik, Michal K., and Henrik M. Jensen. "Evaluation of Defects in Adhesive Joint by Double Cantilever Beam Experiment." Key Engineering Materials 665 (September 2015): 101–4. http://dx.doi.org/10.4028/www.scientific.net/kem.665.101.

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We analyzed effects of interface/adhesive defects during fracture mechanical Mode I Double Cantilever Beam (DCB) tests of an adhesive joint. Two aluminium slabs were bonded using structural epoxy adhesive. A DCB experiment under static loading was conducted to estimate the critical fracture energy. During the ‘steady-state’ fracture we noted oscillating, random fluctuation in the force vs. displacement curve, and thus in the fracture energy. This is associated to the local variation of properties within the bondline and the interfaces. A simple model is derived to quantify the probable density of flaws observed experimentally.

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Kotoul, Michal, Petr Skalka, and Ivo Dlouhy. "Crack Bridging Modelling in Bioglass® Based Scaffolds Using Gradient Elasticity Theory." Key Engineering Materials 665 (September 2015): 105–8. http://dx.doi.org/10.4028/www.scientific.net/kem.665.105.

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The paper deals with crack bridging modelling in Bioglass® based scaffolds due the presence of a special polymer coating. This includes a careful identification of bridging mechanism by polymer ligaments, selection of a suitable bridging model and its implementation into the gradient elasticity model of crack.

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Glaser, B., Nenad Gubeljak, and Jožef Predan. "Calibration Function for Fatigue Crack Propagation." Key Engineering Materials 665 (September 2015): 109–12. http://dx.doi.org/10.4028/www.scientific.net/kem.665.109.

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Components and structures exposed to elastic dynamic loading respond with different surface or bulk material changes which could be monitored on the through surface deformation measurements. The measurements could be performed with electronic devices used for on-line computerized measurement systems. Fatigue induced flaw growth was monitored on a 4-point specimen, loaded by cyclic dynamic bend forces. The flaw growth was monitored by strain gauges and analyzed to determine the shape, propagation and cross sections of the crack. To determine the stress intensity factor a numerical model was developed based on measured crack shapes, material properties and cyclic loading data of the actual tested specimen. The analyses results showed that derived calibration curve could be used to predict surface deformations as a result of crack propagation and growth. With the determination of surface deformation, one could follow the crack transition from surface crack to through thickness crack. The goal of this paper is to describe methodology and results based on experimental analysis during crack propagation and potential use of this technique for online monitoring purposes.

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42

Du, Zhen Ni, Yong Cai Zhang, Zhi You Xu, and Ming Zhang. "Hydrothermal Synthesis of Hexagonal Phase Zn_1-XMn_xS (x = 0–0.05) Nanorods Using Single-Source Precursors." Materials Science Forum 663-665 (November 2010): 100–103. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.100.

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The synthesis of hexagonal phase Zn1-xMnxS (x = 0–0.05) nanorods was achieved by hydrothermal treatment of zinc manganese diethyldithiocarbamates (Zn1-xMnx-(DDTC)2, x=0–0.05) in 40 mass % hydrate hydrazine aqueous solution at 180 °C for 12 h. The structure, composition and optical property of the obtained products were characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, transmission electron microscopy and UV-vis diffuse reflectance spectra.

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43

Wang, Wen, Li Juan Liu, and Mei Juan Lin. "Study on the Tri-Functional Copolymer Containing 1,3,4-Oxadiazole, Carbazole and Terbium Complex." Materials Science Forum 663-665 (November 2010): 1012–15. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1012.

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A novel tri-functional copolymer P1 containing hole transporting units, electron transporting units and terbium complex units was synthesized via radical copolymerization. It was characterized by DSC, TGA, Fluorescence, CV and I-V data test. The results showed that the copolymer P1 was capable of pure green emission in the solid state under UV excitation and had potential application in the memory or light-emitting device.

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44

Li, Yi Gui, and Susumu Sugiyama. "Fabrication Multi-Layer Polymer Microstructures by X-Ray Lithography with Alignment." Materials Science Forum 663-665 (November 2010): 1016–19. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1016.

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Poly(methyl methacrylate)(PMMA) and Poly L-lactic acid (PLLA) are transparent and they are suitable for optical purposes. The multi-layer polymer microfabrication can be applied for a large displacement actuator and precision sensors. A new method is intruduced to generate the multi-layer polymers microstructures by X-ray lithography with alignment. The function of X-ray on polymer materials are breaking the polymer main chain and generating intermediates which can be degraded further and finally dissolved by the solvent interaction. The method for polymer micromachining by using X-ray lithography with alignment for fabrication multi-layer micro polymer structures is confirmed experimentatively.

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45

Li, Jing, Yong Cai Zhang, and Ming Zhang. "Preparation of SnS₂ Thin Films by Chemical Bath Deposition." Materials Science Forum 663-665 (November 2010): 104–7. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.104.

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A chemical bath deposition method has been proposed for the preparation of SnS2 thin films onto glass slides from the aqueous solutions of tin (IV) chloride pentahydrate, thioacetamide and citric acid at 35 °C. High quality SnS2 thin films were obtained by adjusting the amounts of citric acid, which was used here as a complexing agent. The as-prepared thin films were characterized by Raman spectra, field emission scanning electron microscopy (FESEM), surface profiler and UV-vis absorption spectra. Raman spectra revealed that the as-prepared films were of hexagonal phase SnS2. FESEM images and surface profiler measurements indicated that the SnS2 thin film deposited under the optimum condition was homogeneous and well adhered to the substrate, with a thickness of about 200 nm. Optical absorption measurements disclosed that the SnS2 thin film deposited under the optimum condition had a band gap of about 2.40 eV.

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46

Wang, Xin, Yuan Yuan Dou, Mei Shan Pei, and Xin De Tang. "Synthesis and Characterization of D-Galactopyranose-Containing Amphiphilic Block Copolymers via ATRP." Materials Science Forum 663-665 (November 2010): 1057–60. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1057.

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Biocompatible and biodegradable synthetic materials have attracted considerable attention during the past two decades. In this work, a series of amphiphilic triblock copolymers containing D-galactopyranose were synthesized by atom transfer radical polymerization (ATRP). The macroinitiator was prepared by the esterification between poly(ethylene glycol) monomethyl ether with a number-average molecular weight of 1200 g/mol (MeOPEO-1200) and 2-bromoisobutyryl bromide. The sugar-bearing monomer, 6-O-methacryloyl-1,2;3,4-di-O-isopropylidene-D-galactopyranose (MAIPG) was polymerized using PMDETA/CuBr as catalytic system and anisol as solvent. The chemical structure and composition of the resultant polymer MeOPEO-b-PMAIPG were verified by 1H NMR. The molecular weights and their polydispersities were characterized by gel permeation chromatography (GPC). The results indicate that the polymerization follows the mechanism of ATRP. The amphiphilic copolymers can self-assembly to from micelles with PMAIPG as the core and PEO as the corona, which have potential applications as biomaterials or controlled release drug delivery systems.

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47

Liu, Xun, Jun Yan Liu, Xu Dong Li, and Guang Yu Zhang. "Analysis of Stress in Aircraft Components Using Lock-In Thermography." Materials Science Forum 663-665 (November 2010): 1073–76. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1073.

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This paper describes a theoretical and experimental analysis on full-filed stress distribution from thermoelastic measurements and its application to determination of stress concentration. The sum of the principle stress can be measured by Thermal Stress Analysis (TSA). Lock-in Thermography is very effective tool to measure the structure stress distribution by its high thermal resolving. In this study, the thermoelastic effect theory is described and the relationship between the temperature and the applied stress is developed in an elastic material. Experiments were carried out with 2A12 aluminium alloys plate and ones with hole structure under cyclic load. The thermoelastic effect coefficient is obtained for 2A12 aluminium alloys materials, and the effect law is analyzed that the stress value measured was affected by load frequencies. The optional load frequency is obtained, and that is, the load frequency is selected greater than 3.5Hz for 2Al12 materilas, and it was found that the structure stress can be evaluated with good accuracies by the lock in thermography. The experiment was carried out for aircraft components stress distribution measurement and structure stress analysis. The experimental results show the stress concentration position is easy found from stress distribution by lock-in thermography.

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48

Hu, Yue Hui, Hai Jun Xu, Hao Gao, and Yi Chuan Chen. "Fabrication the Texture Zinc Oxide Thin Films and its Application in Hydrogenated Amorphous Silicon Solar Cell." Materials Science Forum 663-665 (November 2010): 1077–80. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1077.

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The pyramid-like textured ZnO film was prepared directly by magnetron sputtering on the self-supporting substrate of ZnO:Al film fabricated by sol-gel. The performance of amorphous silicon solar cell has been studied using the textured ZnO film as a front electrode. It was found that: (1) using the textured ZnO film as an amorphous silicon solar cell front electrode, it can be improved the open voltage, but the fill factor and conversion efficiency was depraved; and (2) inserting a protocrystalline silicon buffer layer between ZnO and p-a-SiC:H, the performance of solar cell was improved obviously. For example, its conversion efficiency increases from 7.3% for the SnO2: FTCO to 7.9% for the ZnO/pc-Si:H TCO.

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49

Ding, Chao Liang, Min Teng, Zhi Guo Zhao, and Liu Zhan Pan. "Spectral Properties of Spatially and Spectrally Partially Coherent Pulsed Beams in Fused-Silica Glass Medium." Materials Science Forum 663-665 (November 2010): 108–12. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.108.

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Using the coherence theory of non-stationary fields and the method of Fourier transform, the spectral properties of spatially and spectrally partially coherent Gaussian Schell-model pulsed (GSMP) beams in fused-silica glass medium are studied and analyzed numerically. It is shown that the spectral shift takes place, which depends on the position of the field point, spatial correlation length, temporal coherence length and dispersive property of medium, as GSMP beams propagate in fused-silica glass medium. The on-axis spectrum is blue-shifted, and the relative spectral shift increases with increasing propagation distance, and decreases as the spatial correlation length and temporal coherence length increases, and then approaches an asymptotic value. The dispersive property of medium plays an important role in the spectral properties of spatially and spectrally partially coherent beams.

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50

Ren, Xiu Feng, Fen Wang, Yuan Zhou, Hong En Nian, Yu Na Pang, and Hong Bin Wang. "Investigation and Preparation of the SCR Catalysts Nano-Co/Ce-V-Zr-TiO₂." Materials Science Forum 663-665 (November 2010): 1097–102. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1097.

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The nano-Co/Ce-V-Zr-TiO2 catalysts with the selective catalytic reduction (SCR) were prepared by methods of Sol-gel, impregnation (IM) and co-precipitation (CP). The phase compositions, microstructures and specific surface area of the catalysts were analyzed by BET, XRD and SEM, respectively. The effect of CeO2, CoO, V2O5 and V2O5 loading and reaction temperature on the catalytic performances of the as-prepared catalysts was investigated by using the selective reduction of NOx with NH3. The results showed all the as-prepared Co/Ce-V-Zr-TiO2 catalysts were made up of nanometer grains. Compared to conventional TiO2 catalysts, the as-prepared Co/Ce-V-Zr-TiO2 catalysts possessed better catalytic performance, higher adsorbability and larger area of contact with reactant, which is due to large quantity surface micropores. The NOx conversion of SCR over 8 wt%Co/Ce-V-Zr-TiO2 catalysts reached 98.3% at the reaction temperature of 550 oC. Furthermore, the activity of Co/Ce-V-Zr-TiO2 catalysts were improved by the Co loading, however, further increasing the Co loading lead to decrease the catalysis activity.

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