Retained austenite has an important effect on strength and toughness of 20Mn2SiCrMo bainitic rail steel. In this work, the stability of retained austenite and mechanical properties have been studied. The results show ...
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Low‐cost, single‐step synthesis of hollow nanotubes of N‐doped carbon deposited on CoS is enabled by the simultaneous use of three functionalities of polyacrylonitrite (PAN) nanofibers: 1) a substrate for loading a...
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Low‐cost, single‐step synthesis of hollow nanotubes of N‐doped carbon deposited on CoS is enabled by the simultaneous use of three functionalities of polyacrylonitrite (PAN) nanofibers: 1) a substrate for loading active materials, 2) a sacrificial template for creating hollow tubular structures, and 3) a precursor for in situ nitrogen doping. The N‐doped carbon in hollow tubes of CoS provides a high‐capacity anode of long cycle life for a rechargeable Li‐ion or Na‐ion battery cell that undergoes the conversion reaction 2 A + +2 e − +CoS →Co+A 2 S with A=Li or Na.
Factors affected drying speed of energy saving and environment friendly water-based self-drying / fastdrying foundry coatings and its regularity changing were analyzed. The results show that the self-drying speed of c...
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Factors affected drying speed of energy saving and environment friendly water-based self-drying / fastdrying foundry coatings and its regularity changing were analyzed. The results show that the self-drying speed of coating is improved significantly with the decrease of humidity and the increase of temperature, the coating is able to naturally dry in about 2 hours under the condition of 25 °C and 80% RH, the self-drying speed of coating increases in an approximately linear manner with the decreasing of its thickness, the hot air quick drying time of the water-based self-drying / fast-drying coating is 3.5-7.0min when the thickness of coatings is 0.3-0.8 mm and the hot air temperature is 80 °C±5 °C.
In this study corrosion resistance of Ti-Ta-Zr coatings fabricated on VT14 titanium alloy workpieces using a high-energy electron beam injected in the atmosphere was investigated. Estimation of corrosion resistance of...
In this study corrosion resistance of Ti-Ta-Zr coatings fabricated on VT14 titanium alloy workpieces using a high-energy electron beam injected in the atmosphere was investigated. Estimation of corrosion resistance of surface alloyed layers was carried out by the weight-change method. Boiling solution of 65 % nitric acid in water and 5 % of sulfuric acid in water were used as the corrosive environments. Investigation of samples after corrosion tests was carried out using a Carl Zeiss EVO 50 XVP scanning electron microscope.
We demonstrate the scattering superlens using elastic scattering to obtain sub-diffraction resolution. Scattering from disordered nanoparticles enables to reconstruct the sub-wavelength image of the target through tim...
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ISBN:
(纸本)9781467371100
We demonstrate the scattering superlens using elastic scattering to obtain sub-diffraction resolution. Scattering from disordered nanoparticles enables to reconstruct the sub-wavelength image of the target through time-reversal and transmission matrix.
The Marching Cubes algorithm is widely used to generate surfaces from implicit functions. It builds a mesh of triangles but many degenerated ones happen to appear among them, which can make the mesh thus built unfit f...
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作者：
Kim, Keon-HoHong, Soon-IlDivision of Wood Engineering
Department of Forest Products Korea Forest Research Institute 57 Hoegiro Dongdaemun-guSeoul130-712 Korea Republic of Program of Forest Biomaterials Engineering
Division of Forest Material Science and Engineering College of Forest and Environmental Sciences Kangwon National University 1 Kangwondaehak-gil Chuncheon-si Gangwon-do200-701 Korea Republic of
To evaluate the shear performance of the textile glass fiber and the sheet glass fiber reinforced glulam bolted connections, a tension type shear test was conducted. The average yield shear strength of the bolted conn...
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To evaluate the shear performance of the textile glass fiber and the sheet glass fiber reinforced glulam bolted connections, a tension type shear test was conducted. The average yield shear strength of the bolted connection of reinforced glulam was increased by 12% ? 31% compared to the non-reinforced glulam. It was confirmed that the shear performance of 5D end distance of the glass fiber reinforced glulam connection corresponds to that of 7D of the non-reinforced glulam connection proposed in building design requirements in various countries. Compared to the non-reinforced glulam, the average shear strength of textile glass fiber reinforced glulam was markedly increased. The non-reinforced glulam and the GFRP reinforced glulam underwent a momentary splitting fracture. However, the failure mode of textile glass fiber reinforced glulam showed a good ductility.
作者：
Kim, Keon-HoHong, Soon-IlDivision of Wood Engineering
Department of Forest Products Korea Forest Research Institute 57 Hoegiro Dongdaemun-guSeoul130-712 Korea Republic of Program of Forest Biomaterials Engineering
Division of Forest Material Science and Engineering College of Forest and Environmental Sciences Kangwon National University 1 Kangwondaehak-gil Chuncheon-siGangwon-do200-701 Korea Republic of
To study the bearing characteristics of glass fiber reinforced glulam for structural design, bearing strength tests were performed. Bearing loads were applied in the direction parallel to the grains, and the holes wer...
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To study the bearing characteristics of glass fiber reinforced glulam for structural design, bearing strength tests were performed. Bearing loads were applied in the direction parallel to the grains, and the holes were prepared in such a way that the bolts would bear and support all the layers. The yield bearing strengths of the glass fiber reinforced glulam were found to be similar to those of the non-reinforced glulam, and were almost constant regardless of increases in bolt diameter. The ratio of the experimental yield bearing strength to the estimated bearing strength according to the suggested equation of the Korea Building Code and National Design Specification was 0.91∼1.03. For the non-reinforced glulam and the sheet glass fiber reinforced plastic glulam, the maximum bearing load was measured according to the splitting fracture of specimens under bolt. The textile glass fiber reinforced glulam underwent only an embedding failure caused by the bearing load. The failure mode of reinforced glulam according to bearing load will influence the failure behavior of bolted connection, and estimating the shear yield strength of the bolted connection of the reinforced glulam is necessary, not only by using the bearing strength characteristics but also using the fracture toughness of the reinforced glulam.
Lead-free (K, Na)NbO3(KNN) ferroelectric films were fabricated on Ti substrates by sol-gel non-alkoxide process. Nb2O5 was used to prepare the soluble niobium source by citrate method. KNN thin films with perovskite p...
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In order to clarify the austenite reverse transformation of a 0.2C-3Mn-1.7Si steel during intercritical region with an ultra-slow heating rate of 0.05 °C/s, DIL (dilatometer), SEM, XRD and EPMA were carried out. ...
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