共查询到19条相似文献，搜索用时 109 毫秒
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樊文化 《科技．人才．市场》2007,28(6):91-93
自愈环是SDH组网最常用的结构方案，本论文探讨了几种自愈环的原理，分析其各自的特点及应用场合，着重研究了各种自愈环的容量，得出了复用段保护环信道利用率要大大高于通道保护倒换环的结论，并且论述了如何根据网络所处层次、业务分布等原因灵活使用各种自愈环。 相似文献
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根据电力系统通信的特点,与通道自愈环相比,对同步数字传输体制中自愈环及其生存性和网络互通进行了阐述.自愈环分通道保护环和复用段共享保护环,SDH自愈环保护是现代大容量光纤网络具有很高安全性和生存性的手段之一. 相似文献
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刘瑞霞 《内蒙古科技与经济》2012,(18):161
介绍了包头供电局光纤通信资源整合过程中发生的双纤自愈环不能自动倒换的故障经过,针对故障情况对自愈环保护配置、端口连接、光口性能、倒换功能等进行了检查,分析了故障原因并进行故障点定位,提出了相应的处理建议。 相似文献
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智能电网的重要特征是"自愈",多代理技术在计算机网络自愈等诸多领域都有很多成功的应用案例。文章介绍了多代理技术的工作原理和特征,总结了智能配电网自愈控制的特点及其关键环节,针对多代理技术应用于电力系统,构建了基于多代理技术的电网自愈框架结构,阐述了各个代理的功能及其协作关系,最后对自愈控制流程进行了进一步的分析。 相似文献
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RPR技术(弹性分组环)是一种新型的MAC层协议,它具有弹性的特点,即能够实现50ms时间内的故障保护切换.RPR采用了SDH的环形结构,和SDH同样具有故障自愈能力强的特点,但有一定的区别.文章分析了两种保护机制的特点,比较了二者的联系与区别. 相似文献
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智能电网是现代电网的发展方向,受到世界各主要国家的高度重视。自愈能力是保证电网安全稳定运行,提供优质电力的保障,是智能电网的关键技术。本文对配电网自愈的相关概念进行了阐述,介绍其关键技术和实现自愈控制的方法。 相似文献
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《科技通报》2017,(12)
提出一种自愈型防水混凝土在地铁隧道施工中的应用分析方法。该方法以普通混凝土结构的设计原理为依据,计算出自愈型防水混凝土构建正截面及斜截面的近似测量值,得出自愈型防水混凝土在地铁隧道施工中相应的脆性破坏机理。确定地铁隧道施工过程中的风险因素,采用层次分析法来构建自愈型防水混凝土在施工中的风险指标评价体系,以抗压强度为评价指标制订了地铁隧道防水混凝土的配合比设计方案,并在抗压强度符合地铁隧道防水混凝土层的强度要求后对抗折的强度与劈裂抗拉的强度进行检验,完成自愈型防水混凝土在地铁隧道施工中的安全稳定性分析。实例表明,将自愈型防水混凝土应用在地铁隧道施工中可有效的解决抗裂防水问题,减少施工的工期,提高地铁运行的安全性。 相似文献
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Luzhi Zhang Jiahui Liang Chenyu Jiang Zenghe Liu Lijie Sun Shuo Chen Huixia Xuan Dong Lei Qingbao Guan Xiaofeng Ye Zhengwei You 《国家科学评论(英文版)》2021,8(5)
Elastomers are essential for stretchable electronics, which have become more and more important in bio-integrated devices. To ensure high compliance with the application environment, elastomers are expected to resist, and even self-repair, mechanical damage, while being friendly to the human body. Herein, inspired by peptidoglycan, we designed the first room-temperature autonomous self-healing biodegradable and biocompatible elastomers, poly(sebacoyl 1,6-hexamethylenedicarbamate diglyceride) (PSeHCD) elastomers. The unique structure including alternating ester-urethane moieties and bionic hybrid crosslinking endowed PSeHCD elastomers superior properties including ultrafast self-healing, tunable biomimetic mechanical properties, facile reprocessability, as well as good biocompatibility and biodegradability. The potential of the PSeHCD elastomers was demonstrated as a super-fast self-healing stretchable conductor (21 s) and motion sensor (2 min). This work provides a new design and synthetic principle of elastomers for applications in bio-integrated electronics. 相似文献
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Serum alkaline phosphatase (ALP) (EC 3.1.3.1), 5′nucleotidase (5′NT) (EC 3.1.3.5), aldolase (ALD) (EC 4.1.2.13) and sorbitol
dehydrogenase (SDH) (EC 1.1.1.14) were estimated in infective hepatitis, alcoholic hepatitis, chronic active hepatitis, obstructive
jaundice, cirrhosis of liver and amoebic liver abscess. It was observed that serum ALP and 5′NT were significantly increased
in all cases of chronic active hepatitis and obstructive hepatic disease. However, the elevation observed in the latter was
much higher than the former. Serum SDH and ALD levels were elevated in all cases of infective hepatitis, studied though increase
in the former was much higher than the latter, suggesting its significance in the diagnostic confirmation of this disease.
Results presented suggest 5′NT and SDH as more reliable diagnostic test compared to ALP and ALD for obstructive jaundice and
infective hepatitis respectively. 相似文献
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PTN(Packet Transport Network)是一种以分组作为传送单位,兼容TDM、ATM和FC等业务的综合传送技术。结合目前主要的铁路通信传送网技术PCM、SDH、MSTP和WDM,探讨PTN技术在铁路传送网的应用发展。 相似文献
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无线Mesh网络是一种通过无线链路连接路由器和终端设备的无线多跳网络,是一种新型宽带无线接入技术,具有可靠性、自组织性和自愈性的特点。而且建网方便快捷,成本低,具有传统有线、无线网络系统无可比拟的优势和广阔的应用前景,能为无线个域网、局域网、校园网甚至城域网提供无线宽带接入服务。无线Mesh网络中的每个节点都具有路由转发功能,再加上网络中节点的频繁移动,使得路由技术成了无线Mesh网络中的关键技术。 相似文献
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我们回顾了SDH/SONET到进化的弹性网络业务量疏导方法的演进以及弹性率技术的发展,并总结相关问题。切片光转发器被确定为一种新型的技术,可能会影响未来的疏导模式。 相似文献
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Shedid SM Saada HN Eltahawy NA Hammad AS 《Indian journal of clinical biochemistry : IJCB》2018,33(3):314-321
Radiation induced brain damage is associated with impairment of mitochondrial functions, variations in the level of neurotransmitters, and oxidative stress. Mitochondrial function is closely linked to the level of neurotransmitters since the precursors are supplied by the Kreb’s cycle intermediates. The objective of this study was to evaluate the influence of pantothenic acid, an essential component in the synthesis of Coenzyme A (CoA), on the activity of the Krebs cycle enzymes, isocitrate dehydrogenase (IDH), α-ketoglutarate dehydrogenase (α-KGDH), and succinate dehydrogenase (SDH); the level of aspartic, glutamic and GABA; the activity of transaminases, and oxidative stress, in the cerebrum of γ-irradiated rats. Pantothenic acid (26 mg/Kg) was orally administered to the rats, 2 h after irradiation and during the following 5 days. Animals were sacrificed the 7th day post-irradiation. The exposure of male albino rats to γ-rays (5 Gy) has triggered oxidative stress notified by a significant elevation in the level of malondialdehyde (MDA), an end product of lipid peroxidation, associated to a significant decrease in the content of phospholipids, and the antioxidant compound glutathione (GSH). The activity of IDH, α-KGDH, and SDH, has significantly decreased, while the level of aspartic, glutamic and GABA has significantly increased. In parallel to these changes, the activity of alanine and aspartate transaminase has significantly increased, compared to their values in the control rats. Pantothenic acid treatment, has significantly attenuated oxidative stress; enhanced the activity of IDH, α-KGDH, and SDH; minimized the increase in the level of amino acids and the activity of transaminases, compared to their values in the cerebrum of irradiated rats. In conclusion, pantothenic acid could improve the level of neurotransmitters amino acids, which depends on the enzymatic activities of Krebs cycle and linked to oxidative stress. 相似文献
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目前信息资源、信息产业已成为城市最具活力新的经济增长点。在行政区域广电信息网的建设中,S D H数字微波网络系统的传输技术更快、更简、更经济,容量大、速度快、应用范围广等优点是解决综合业务网的优选方案之一。 相似文献