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1 Ｉｎｔｒｏｄｕｃｔｉｏｎ Ｗｉｔｈｔｈｅｓｐｒｅａｄｉｎｇａｎｄｄｅｖｅｌｏｐｍｅｎｔｏｆｄａｔａｔｒａｎｓｍｉｓｓｉｏｎｓｅｒｖｉｃｅｓ,ｔｈｅｒｅｑｕｉｒｅｍｅｎｔｏｎｎｅｔｗｏｒｋｂａｎｄｗｉｄｔｈｉｓｅｘｐｏｎｅｎｔｉａｌｌｙｉｎｃｒｅａｓｉｎｇ .Ｉｎｃｏｍｐｕｔｅｒｌｏｃａｌａｒｅａｎｅｔｗｏｒｋ (ＬＡＮ) ,ｔｈｅｄｏｍｉｎａｎｔｔｅｃｈｎｉｑｕｅｉｓＥｔｈｅｒｎｅｔ,ｗｈｉｃｈｉｎｔｅｒｃｏｎｎｅｃｔｓｎｅａｒｌｙ 80 ｐｅｒｃｅｎｔｏｆ ｐｅｒｓｏｎａｌｃｏｍｐｕｔｅｒｓ.Ｉｔｈａｓ… 相似文献
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In this paper, a new scheme has been proposed to achieve high-performance local area network adopting 5～15 nm separated coarse wavelength division multiplexing (CWDM) technique. Using this scheme, the current single-wavelength gigabit Ethernet can be seamlessly upgraded to multi-wavelength network. Not only can the network bandwidth be broadened, but also wavelength routing can be achieved among different sub-networks. The data packet communication latency can be reduced one-to-two magnitudes in comparison with that of the current gigabit Ethernet. To expand the network scale, multi-wavelength-window CWDM technique can be adopted. Two kinds of network interface cards have been designed using opto-electronics devices at the 850 nm and 1300 nm wavelength windows, respectively. Experiments indicate that the two kinds of CWDM signals can be selectively received at the corresponding optical detectors. By introducing two optical dropping devices in the network, multi-wavelength-window (850 nm, 1300 nm and 1550 nm) CWDM system can be achieved. 相似文献
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合成甲醇反应是CO+H_2反应系列中较简单的反应之一,它与同系列的甲烷化反应有着不同的反应条件.从热力学观点来看,甲烷化反应和合成甲醇反应同是体积缩小反应,加压应该有利于两反应的进行,实际上合成甲醇反应需加压,而甲烷化反应却不一定需要加压.最近我们用动态分析技术对烃的临氢转化、乙炔加氢和苯加氢反应研究发现,在实际反应条件下,反应物在催化剂表面上的吸附可分为可逆与不可逆吸附两类,它们在多相催化反应中对活性、选择性和稳定性均有影响,但是它们对操作压力的依赖程度是不一样的.因此研究 相似文献
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本文从研究液固吸附动态分析装置如何稳压、稳流及如何检测原位信息等关键问题入手，设计和建立了一套可用于液固体系离子吸附研究的动态分析装置，并通过实验证明该液固吸附动态分析装置能快速、准确地给出离子在吸附剂上的吸、脱附动态信息，为液固体系的吸附研究提供了一种可靠的手段。 相似文献
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Dynamic and tunable chromatic dispersion compensationtechnique is one of the essential features of 40-Gb/s op-tical fiber transmission systems. The tolerable residualchromatic dispersion for 40-Gb/s transmission system isonly 60 ps/nm or even less[1]. At the same time, chro-matic dispersion varies due to network reconfigurations,temperature fluctuation, and laser's wavelength drift,etc[2]. Therefore, it is necessary to apply a simple andeffective method for monitoring the residual chromaticdi… 相似文献
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在推导出适应于甲烷化反应体系非线性动态分析不同吸附物种动力学参数模型的基础上，采用计算优化出工业镍铝甲烷化催化剂上可逆吸附氢和可逆吸附一氧化碳的吸附速率常数和吸附平衡常数。结果表明，镍铝催化剂上吸附可逆氢要比吸附一氧化碳快２．２倍左右。该结果为镍铝催化剂上甲烷化产物的生成主要依赖于一氧化碳的吸附这一判断提供了理论依据。由于镍铝催化剂上甲烷化是可逆吸附氢与不可逆吸附一氧化碳共同作用的结果，且不可逆吸 相似文献
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