The Experts below are selected from a list of 102 Experts worldwide ranked by ideXlab platform
Xin Wei - One of the best experts on this subject based on the ideXlab platform.
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Distribution of the intensity absorbed by evaporative front in laser cutting Nonmetallic Material
Optics and Lasers in Engineering, 2008Co-Authors: Xiao-zhu Xie, Xin WeiAbstract:The distribution of the intensity absorbed by the evaporative cutting front is investigated using ray-tracing method after the laser beam undergoes multiple reflections in an actual kerf photographed experimentally. The laser beam is characterized by focused Gauss beam. Fresnel absorption on the kerf is taken into account, while inverse bremsstrahlung absorption is negligible. The influences of the times of multiple reflections and laser beam's position on the absorbed intensity are also discussed. Results indicate front intensity absorption is mainly determined by the first three incident beams. The laser axis moves toward the front, which is affected by the cutting speed.
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Mechanism of CO2 laser cutting Nonmetallic Materials based on wall focusing effects
Lasers in Material Processing and Manufacturing III, 2007Co-Authors: Xiao-zhu Xie, Xin WeiAbstract:A three-dimensional energy coupling model for evaporative laser cutting Nonmetallic Material is established through theoretical analysis and the reflective transmission and energy absorption of laser against real bended cutting front and both two walls are analyzed. The front and wall's energy absorption is mainly determined by the first three incident beams, that is two reflections. The multiple reflections from the front will increase the power intensity of the bottom and the multiple reflections from the wall will increase the power intensity from the center to the bottom. Due to the multiple reflections, the power intensity distributes over the total front. Due to the cutting speed, the laser axis moves toward the front. The differences of absorptive power intensity among the three polarizations light are much smaller than those of metal. Both two walls will have waveguide effects on the incident light which will mutual reflect against both walls and transmit toward the bottom of the cut, which is so-called "wall focusing effects".
Takeshi Hasegawa - One of the best experts on this subject based on the ideXlab platform.
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a novel measurement technique of pure out of plane vibrational modes in thin films on a Nonmetallic Material with no polarizer
Journal of Physical Chemistry B, 2002Co-Authors: Takeshi HasegawaAbstract:A novel measurement technique has been developed to simultaneously obtain polarized spectra of in-plane (IP) and out-of-plane (OP) vibrational modes in optically thin films deposited on a Nonmetallic substrate without using a polarizer. These spectra correspond to the conventional infrared transmission and reflection−absorption (RA) spectra, respectively. It has been commonly believed that the mode-selective measurements require polarizers and a specific surface. In particular, the OP-mode measurements always require a metallic surface to generate the surface-normal electric field in the films. The present technique overcomes the limitations of the measurements by considering the concept of virtual longitudinal-wave light using a new arithmetic regression model. The nonpolarized transmitted infrared ray through thin films on a transparent Material (Ge) was collected at different angles of incidence, and the transmittance single-beam spectra were subjected to the chemometric spectral resolution, so that ab...
Yinen Tang - One of the best experts on this subject based on the ideXlab platform.
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Manufacturing process of reproduction plate by Nonmetallic Materials reclaimed from pulverized printed circuit boards.
Journal of hazardous materials, 2008Co-Authors: Jie Guo, Jiuyong Guo, Bin Cao, Yinen TangAbstract:The aim of this study was to present a new method for resource utilization of Nonmetallic Materials reclaimed from pulverized waste printed circuit boards. A reproduction Nonmetallic plate (RNMP) was prepared by adding resin paste, glass fiber and additives into Nonmetallic Materials using self-made hot-press former. Principle of manufacturing process and effects of mould temperature and moulding time on the mechanical properties of RNMP were studied. The results showed that when moulding pressure was fixed at 6 MPa, the optimum conditions for the RNMP were as follows: 140/135 degrees C for top/bottom mould temperature, 5 min for moulding time. The maximum content of Nonmetallic Materials in RNMP was up to 40 wt%. When Nonmetallic Material content was 20 wt%, the RNMP moulded at optimum conditions had excellent mechanical properties, with impact strength of 5.8 kJ/m(2) and flexural strength of 65.1 MPa.
Xiao-zhu Xie - One of the best experts on this subject based on the ideXlab platform.
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Distribution of the intensity absorbed by evaporative front in laser cutting Nonmetallic Material
Optics and Lasers in Engineering, 2008Co-Authors: Xiao-zhu Xie, Xin WeiAbstract:The distribution of the intensity absorbed by the evaporative cutting front is investigated using ray-tracing method after the laser beam undergoes multiple reflections in an actual kerf photographed experimentally. The laser beam is characterized by focused Gauss beam. Fresnel absorption on the kerf is taken into account, while inverse bremsstrahlung absorption is negligible. The influences of the times of multiple reflections and laser beam's position on the absorbed intensity are also discussed. Results indicate front intensity absorption is mainly determined by the first three incident beams. The laser axis moves toward the front, which is affected by the cutting speed.
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Mechanism of CO2 laser cutting Nonmetallic Materials based on wall focusing effects
Lasers in Material Processing and Manufacturing III, 2007Co-Authors: Xiao-zhu Xie, Xin WeiAbstract:A three-dimensional energy coupling model for evaporative laser cutting Nonmetallic Material is established through theoretical analysis and the reflective transmission and energy absorption of laser against real bended cutting front and both two walls are analyzed. The front and wall's energy absorption is mainly determined by the first three incident beams, that is two reflections. The multiple reflections from the front will increase the power intensity of the bottom and the multiple reflections from the wall will increase the power intensity from the center to the bottom. Due to the multiple reflections, the power intensity distributes over the total front. Due to the cutting speed, the laser axis moves toward the front. The differences of absorptive power intensity among the three polarizations light are much smaller than those of metal. Both two walls will have waveguide effects on the incident light which will mutual reflect against both walls and transmit toward the bottom of the cut, which is so-called "wall focusing effects".
Andrzej Sobczyk - One of the best experts on this subject based on the ideXlab platform.
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Properties of High Pressure Water Hydraulic Components with Modern Coatings
Advanced Materials Research, 2013Co-Authors: Janusz Pobędza, Andrzej SobczykAbstract:Water hydraulics is coming back as an alternative to oil and other not environment friendly working fluids used in a very wide range of fluid drive and control systems. The cost of water resistant Materials for components is one of the barriers preventing the wide use of water hydraulics, especially moving parts such as pump pistons, surface of cylinder tubes and rods, poppet and seats, etc. to avoid corrosion. One of the common solutions is to use stainless steel there, where it can cooperate with other Nonmetallic Material such as plastic or other noncorrosive metallic composite to reduce friction. Thus some of research was directed to elaboration of special coating for covering surfaces in critical regions of water hydraulic components. The paper describes results of pilot research on selected components where such coating were introduced on regular carbon steel parts, same as used for oil hydraulics. First part of the article contents description of coating technology and some characteristics of coating layers. Second quotes selected results of conducted by authors research on coated hydraulic cylinders and poppet valves.
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Modern Coating Used in High Pressure Water Hydraulic Components
Key Engineering Materials, 2013Co-Authors: Janusz Pobędza, Andrzej SobczykAbstract:Water hydraulics is coming back as an alternative to oil and other not environment friendly working fluids used in very wide range of fluid drive and control systems. One of the barrier causing that water hydraulics is cost of water resistant Materials for components, especially moving parts such as pump pistons, surface of cylinder tubes and rods, poppet and seats, etc. to avoid corrosion. One of common solution is to use stainless steel there, where it can cooperate with other Nonmetallic Material such as plastic or other noncorrosive metallic composite to reduce friction. Thus some of research were directed to elaboration of special coating for covering surfaces in critical regions of water hydraulic components. The article describe results of pilot research on selected components where such coating were introduced on regular carbon steel parts, same as used for oil hydraulics. First part of the article contents description of coating technology and some characteristics of coating layers. Second quotes selected results of conducted by authors research on coated hydraulic cylinders and poppet valves.
