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With the rapid increase of the Internet user and widely application of Web,the current network technology is facing great challenge. More and more multimedia operations occupy plenty of bandwidth,and result in the network congestion. Therefore,people begin to use QoS to utilize the bandwidth effectively,and ensure the transport of the emergent operation data. The paper introduces the protocols and basic components of QoS,then expatiates the conception and the basic principles of policy control QoS, moreover,emphasizes the structure model of policy control QoS and how it runs. At last,it introduces the transport process of data packets under the control of policies in a policy control QoS system,and how to make the policies in the real world. 相似文献
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通过野外调查、收集、查阅文献、引证标本、中药材市场及民间走访,整理出文山州药用兰科植物名录,共计54属170余种。文山州药用兰科植物资源种类丰富,从生活型上看,具备地生、附生(半附生)、腐生各种类型;从植物区系上看,热带区、热带过渡区、亚热带区、温带区、高寒区均有分布;从垂直分布看,具备低海拔、广海拔和高海拔3种类型。对文山州民族药用兰科植物种质资源现状进行分析,并提出尽快出台保护政策,加大执法力度,制定采购限额,防止过度开发利用,完善就地保护工作等保护建议。 相似文献
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到报监测是气象水文数据传输、处理等的重要环节,其实时性是关键设计目标。通过分析文件目录扫描方法和消息通知机制的应用特点,结合气象水文资料传输、处理规程及应用模式,重点阐述了结合实时性和可靠性要求的到报监测方法,并给出一种重构性强、应用灵活的到报监测模块的设计方案。 相似文献
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应用个体生态学和种群生态学等生物多样性研究的原理与方法,对贵州省梵净山区域内的固氮维管束植物进行点与面相结合的系统调查,并对其生态分布特征进行研究。结果表明,梵净山固氮植物种类丰富多样,有固氮维管束植物10科44属104种(包括种下分类群),其中蕨类植物门1科1属4种,裸子植物门2科2属3种,被子植物门7科41属97种。其中木本植物73种,草本植物31种(包括水生植物4种)。梵净山低山林带、中山林带和高山林带等不同海拔高度分布着不同的固氮植物。 相似文献
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Protecting mode is on importmant working method of X86_based computer system,which provides the hardware support for multi_task and multi_process operation system on X86 platform. During the low_level development of X86_based computer system,it is very important to understand the working method of memory that is a main part of computer system. This paper discusses the data structure and hardware component of X86_based computer system which support the two mechanism of accessing memory:segmenting and paging,as well as the process of converting logical address to linear address and mapping virtual address to physical address. Througn segmenting and paging mechanism,we can realize the independent address space for every process in multi_process system,as well as the measure for protecting the system memory which can prevent the system breakup caused by illegal memory access. 相似文献
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浙江省天牛科昆虫名录补遗 总被引:3,自引:0,他引:3
在收集整理浙江省天牛科昆虫297个种和亚种的基础上,记述了在《浙江植物病虫志》(第二集)未记载的天牛52个种和亚种。 相似文献
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为揭示南滚河自然保护区昆虫物种多样性,采用网捕法和灯诱法对该保护区蝉类昆虫进行调查和采集,依据形态特征将采集到的昆虫标本进行分类鉴定,记述各种引证和地理分布信息及分种检索表。结果表明,该保护区蝉类昆虫隶属于7科,8亚科,22属,共计29种,其中叶蝉为优势种群,有16属,22种,二者分别占总记述的72.7%、75.8%;新增云南新记录种7种,分别为:龙眼鸡(Lanternaria candelaria (Linnaeus))、柿广翅蜡蝉(Ricania sublimbata Jacobi)、龟纹圆瓢蜡蝉(Gergi-thus tesselatus Matsumera)、黄面横脊叶蝉(Evacanthus interruptus (Linnaeus))、二刺丽叶蝉(Calodia obliquasimilaris Zhang)、红翅凹大叶蝉(Bothrogonia scarlatina Cai &He)、红色凸冠叶蝉(Convexana rufa Li)。 相似文献
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