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Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

半月刊

1013-9826

Key engineering materials/Journal Key engineering materials
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    Quanta energy level structure and the first-order Freedericksz transition of weak anchoring NLC cells

    Rong-Hua Guan
    402-405页
    查看更多>>摘要：The energy problem of weak anchoring nematic liquid crystal (NLC) cell is investigated. For given system, there are four solutions satisfying mechanical equilibrium conditions simultaneity under certain condition. Liquid crystal system exist quanta energy level. The values and sequence of energy levels related to the change of external field and anchoring parameters. The state with the smallest energy is the stable state and the others are metastable states, which are separated by the energy barriers. The Freedericksz transition can be considered as the director slippage through these barriers to the lowest energy level and the first order transition and bistable state result from the existence of the multiple disturbed solutions.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Selection of voltage and spectral range in liquid crystal gating

    Hanchen LiuHuawa YuXiang'an YanJunfang Wu...
    406-410页
    查看更多>>摘要：Liquid crystal device (LCD) used as spatial gating apparatus has a lot of new using at low light detecting, imaging spectrum and so on. Since LCD's lattice characteristic, it can come true point gating, local field gating and whole surface gating. It can carry out point-by-point control and feedback of imaging cooperating with CCD detector. Some characteristics of we used LCD, LCX023CMT (SONY), have been detected in order to use conveniently, those include spectra transmittance and which's changing with gating voltage. The results show that when incident wavelength more than 650nm, this LCD couldn't be used as spatial gating because of polaroid's extinction ratio becoming worse; LCD can modulate the incident light from 400 to 650nm, and the modulates of wavelength range, extent and linearity were related to the modulate voltage clearly. The results indicate that LCD modulates the incident light better and better at voltage more than 2.5V for 550nm; the action modulated become linear with voltage approximately; the modulate extent goes to saturation at voltage more than 5V, and the spectral range modulated is steady in 400-650nm. At voltage more than 5V, transmittance of spectrum is a horizontal beeline almost with incident wavelength range from 400 to 650nm. This indicates that transmittance of spectrum in this range is same, and liquid crystal has none selectivity in colored light. As a result, there is no chromatism between transmitted and incident light. However, because that there is lower transmittance, the reflected light can be used which can ensure not only effective using ratio of light, but also the consistency between reflected and incident light.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Fabrication of pixel array type FED device with carbon nanotube emitters

    Yukui LiWensheng Xing
    413-416页
    查看更多>>摘要：Because of better field emission characteristics, carbon nanotube was a suitable and excellent cathode material for use in the field emission display device. The screen-printing process was adopted in the course of device fabrication for decreasing the manufacturing cost of the pixel array type field emission display. The new simple-structure flat panel display device with carbon nanotube emitters was reported. The design and fabrication process of pixel array cathode structure were also presented. The silver slurry was screen-printed to form the conducting layer, and the insulation slurry was used to form the high quality insulation layer and covering layer, respectively. The whole display device was vacuum-packaged and developed. The fabricated pixel array type field emission display exhibited better field emission performance and adequate brightness.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    System design on a field emission with phosphor detection

    Jiyu AnChao DengYongjun LiTiezhen Sun...
    417-420页
    查看更多>>摘要：It is well-known that the phosphor is widely used for the field emission display (FED), and its luminescent and temperature properties are very important for the effect of display. In this paper, we propose a measurement scheme for the phosphor, and design a test-equipment to test the luminescent and temperature properties of phosphor. Furthermore, the equipment can also be used for the life-test of the phosphor because it can generate a great excitation power. Finally, there are design principle, structure and some data and result which we obtained in the experiment. These data will be very useful for the design of FED.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Green aluminate phosphors used for information display

    Ye-tang GuoYuan Ming Huang
    421-425页
    查看更多>>摘要：Well known long-persistent phosphorous strontium aluminates were synthesized by conventional combustion method in a furnace at about 600℃. By incorporating the obtained phosphorous strontium aluminates into organic host polystyrene, we prepared the organic-inorganic composite material (i.e., phosphor-polystyrene) which could be cast into flexible and green-light- emitting films. The morphology of the obtained phosphorous strontium aluminates and the phosphorescence of the organic-inorganic composite films were characterized with the scanning electron microscopy and the fluorescence spectroscopy, respectively. Our results show that the organic-inorganic composite films can be used as green-light- emitting roll-able screens in the industry of information displays.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Research of the application of virtual machine manufacturing technology based on internet

    Xiao-jun WangZhong-yue Xiao
    426-430页
    查看更多>>摘要：With the use of virtual manufacturing technology, machine tool enterprise shortens the product design and manufacturing cycle, reduces the cost of the product development and improves the ability of the product in response to rapid changes in the market. With the use of the computer emulation and virtual reality technology, and the computer network, machine tool enterprise enhances the ability of decision-making and control at all levels of manufacturing process. This paper analyzes the key technologies to the virtual machine manufacturing and puts forward three models of the virtual machine manufacturing.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Study on the gloss of polyurethane water-based ink

    C. Q. FangS. S. ZhouM. R. ZhangP. G. Ren...
    431-435页
    查看更多>>摘要：With the advantages of no pollution and no poison, the water-based ink, as a new type of green packaging material, is especially applicable to the food, medicine and drink packaging. However, the traditional domestic water-based ink, featuring some disadvantages in the properties of stability, gloss and so on, increasingly evolves into an enormous obstacle to the widespread application of the packaging and the rapid development of the whole industry. In this paper, the polyurethane resin is adopted to replace the ordinary binder resin in the experiment of the water-based ink, and the gloss of the polyurethane water-based ink is also studied. It is shown that the gloss of water-based ink is influenced by the dispersion of pigment, water content and surface tension of water-based ink system, hydrotropic agent and some other factors.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Fabrication of simple diode structure FED device with connecting plate

    Yukui LiCong Li
    436-439页
    查看更多>>摘要：By using the thick soda-lime glass plate and the flat thin glass, the connecting plates were formed easily. The carbon nanotube materials were prepared to form the field emitters. The simple small diode structure field emission display device with connecting plate was developed. The detailed fabrication technology for the whole device was also presented. The sealing of the vacuum room was performed by means of glass frit and the gas in the vacuum room could be evacuated out through the exhaust tube. The developed diode structure FED sample exhibited large field emission current, better field emission properties and image display performance.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Design and realization of the data collecting system based on USB bus line

    Xiao-guang FuXiao-jun Wang
    440-443页
    查看更多>>摘要：Universal serial bus (USB) is a kind of new bus interface specification, whose characteristics are convenience, high speed, easiness to expand, low cost and low disturbance, etc. So it is extremely fit to be the communication interface between host computer and peripherals. This paper is mainly about the development of data collecting system based on of USB, including hardware design, firmware design, equipment driver programming and application software design based on Windows driver model (WDM). This system works stable. Both the sampling precision and the data transmission speed have reached expected effect.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Crystallization of hydrogenated amorphous silicon by rapid thermal method

    Ruimin JinDingzhen LiLan-li ChenXinfeng Guo...
    444-446页
    查看更多>>摘要：Amorphous silicon films prepared by PECVD on silex glass substrate has been crystallized by rapid thermal annealing (RTA), From the Raman spectra and scanning electronic microscope (SEM), it was found that the Raman spectra wa best crystallized at 950℃ for 5 min. The thin film made by RTA was smoothly and perfect structure.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd