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gathering tree
相关语句
  汇集树
     Based on the MAC protocol of data gathering tree, this thesis analyzes the contradictory problem of energy consumption and delay in the MAC protocols by using synchronous frame. Then an improved MAC protocol which adopting“asynchronous frame”is proposed.
     对于基于数据汇集树的无线传感器网络MAC层协议,本文分析了采用同步帧MAC层协议能耗和延时矛盾的问题,提出一种采用“异步帧”的改进协议。
短句来源
     In sensor networks,data forwarding from multi-source to sink forms a data gathering tree. For this gathering tree an energy-efficient and low-latency LD-MAC protocol was proposed to solve the conflict of energy-efficient and low-latency in previous MAC protocols.
     传感器网络中数据从多个源节点向sink节点的转发形成数据汇集树,针对此汇集树提出低能耗低延时的LD-MAC(Low-Delay MAC)协议,解决以往MAC协议中能耗和延时的矛盾问题。
短句来源
  “gathering tree”译为未确定词的双语例句
     Data transmission module designed on the data gathering tree and staggered receive/send schedule, which resolved the problem of sleep delay and asymmetric communication.
     其数据传输模块就是针对数据采集树结构,采用DMAC的交错调度机制来实现数据的时分复用的方式实现数据传输,解决休眠时延和不对称传输问题。
短句来源
     In our vegetation BRDF model and its application studies, we developed an indirect measuring method named the Tree Computed Tomography (TCT) for gathering tree crown architecture parameters, which include the Leaf Angle Distribution (LAD), Foliage Area Volume Density (FAVD), and Leaf Area Index (LAI).
     在植被BRDF模型及其应用研究中,我们发展了一种树冠结构参数的间接测量方法。 称为“树冠断层成象法(TCT)”,可获取树冠内叶面倾角分布(LAD),叶面积体密度的空间分布(FAVD)和叶面积指数(LAI)。
短句来源
     LEPS routing can form and maintain the data gathering tree in the network,but the link among sensor nodes are not stable,and network topology changes frequently.
     LEPS路由协议可以形成并维护一个树型拓扑,但是节点间链路不够稳定,拓扑变化比较频繁。
短句来源
  相似匹配句对
     In each tree, D.
     在得到的 6棵系统树中 ,D .
短句来源
     The Trouble Tree
     烦恼树
短句来源
     high gathering.
     高集聚性。
短句来源
     Determination of the Areas of Gathering Water for Main Tree Species on the Loess Plateau
     黄土高原主要造林树种集流面积的确定
短句来源
     On the crime of gathering to assault
     论聚众斗殴罪
短句来源
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  gathering tree
Gathering of data from M at a datagathering node I requires first constructing a data-gathering tree T that spans M and is rooted at I.
      


Based on the data which tested the wood physical property,wood heat value andwood chemical property,the data on qualitive and quantitative analysis of bark tannin,andthe analysis of leaves feed ingredient,he test of biomass,draw a conclusion which the woodsuitable for based panel,cabinet worK,sliced veneer ect.The wood with high heat value,be-long to biological fuel,the content of wood holocellulose is 74.5%,suitable for pulping angpaper manufacture,the content of bark tannin is 32.8% in 4 years old,purity is...

Based on the data which tested the wood physical property,wood heat value andwood chemical property,the data on qualitive and quantitative analysis of bark tannin,andthe analysis of leaves feed ingredient,he test of biomass,draw a conclusion which the woodsuitable for based panel,cabinet worK,sliced veneer ect.The wood with high heat value,be-long to biological fuel,the content of wood holocellulose is 74.5%,suitable for pulping angpaper manufacture,the content of bark tannin is 32.8% in 4 years old,purity is 82.4% be-longs to condensate which with good quality tannin. The crude fat content is more than 3.0%,the crude protein content is l0%~14.17%,and l7 amino一acid in the leaves is worth devel-opment and utilization. The biomass is large,above ground biomass is 23.48t/hm2a in 4.5years,the soil under the trees 0~30cm which available nitrogen content is 2.16%~2.36%higer than Betula alnoides,Paramichelia baiIlanii,AItingia excelsa and 1.885~2.19% higerthan natural forest.It is nitrogen─gathering tree. with high economic effciency,the input andoutput of 4.5~3.5 years old of pure plantation forest is 1:7.37 and 1:4.49 respectively.

通过木材物理力学性质、木材热值、木材化学性质的测定,树皮单宁的定性、定量分析,树叶饲用成分的分析测定,生物量的测定等得出:木材宜做人造板、细木工、刨切单板等;木材有效热值高,属优质生物质燃料;木材综纤维素含量达74.5%,适合制浆造纸。4年生树皮单宁含量达32.8%,纯度82.4%,属凝缩类,为优质栲胶原料。树叶含粗脂肪3.0%以上,粗蛋白10%~14.17%,含17种氨基酸,有开发利用饲料的价值。生物量大,4.5年生幼林地上部分生物量达23.48t/hm ̄2年;林下土壤0~30cm内的有效氮含量比西南桦、山桂花、高阿丁枫三种人工纯林高2.16%~2.36%;比天然林高1.88%~2.19%,是优良的固氮树种。其经济效益显著,4.5~3.5年生人工纯林投入产出比分别为1:7.37,1:4.49。

In our vegetation BRDF model and its application studies, we developed an indirect measuring method named the Tree Computed Tomography (TCT) for gathering tree crown architecture parameters, which include the Leaf Angle Distribution (LAD), Foliage Area Volume Density (FAVD), and Leaf Area Index (LAI).  With direct method in field, it is difficulty to measure this kinds of architecture parameters, especially for trees. The TCT algorithm combining both computed tomography theory and vegetation...

In our vegetation BRDF model and its application studies, we developed an indirect measuring method named the Tree Computed Tomography (TCT) for gathering tree crown architecture parameters, which include the Leaf Angle Distribution (LAD), Foliage Area Volume Density (FAVD), and Leaf Area Index (LAI).  With direct method in field, it is difficulty to measure this kinds of architecture parameters, especially for trees. The TCT algorithm combining both computed tomography theory and vegetation canopy gap probability model, makes the indirect method be possible in tree crown architecture measurement. To improve and validate the algorithm, the Tree Computed Tomography field data gathering System(TCTS) was designed for getting more reliable multiviewing points image set in field. Both coniferous and deciduous crowns were selected to do indirect and manual direct measurement to get crown architecture parameters for the validation.  To improve our TCT algorithm, the average skylight distribution during the multiviewing points data gathering is reconstructed, the LAD estimation is considered, and the trunk/branches information is taken into account of FAVD reconstruction. Comparing the reconstructed 3d FAVD and manual measurement data, the results show that the reconstructed FAVD fit the manual measurement data very well. Then these indirect measured crown architecture parameters and measured radiance of lighted crown had been used in our BRDF model studies. This paper presents the above approach and the validation results.

在植被BRDF模型及其应用研究中,我们发展了一种树冠结构参数的间接测量方法。称为“树冠断层成象法(TCT)”,可获取树冠内叶面倾角分布(LAD),叶面积体密度的空间分布(FAVD)和叶面积指数(LAI)。文中论述对该方法的进一步发展,利用实测的针、阔叶树冠数据对TCT方法的验证。为了克服前文中所述的问题,我们研制了树冠断层象底视数据采集系统(TCTS),获取树冠的多视点底视图象。该系统由便携式微机,图象数字化板,可见光/近红外广角摄象机及其支架导轨,图象监示器组成。摄取图象可实时数字化存于计算机硬盘,并可实时监视图象采集质量。摄象机支架和导轨可控制摄象机身的姿态,并保证其在地面给定水平方向的连续移动。我们选择针叶和阔叶两种树种进行算法验证,设计进行了多次野外的多视点底视图象采集,并同期进行手工的树冠结构参数测量,包括树冠形状和叶面积体密度。TCT方法的改进主要有:1)提取了图象采集过程中天空光的分布,作为从图象中推算方向间隙率的参考量。2)将用单张广角图象提取的叶角分布(LAD)引入TCT算法。3)利用近红外图象可区分枝干和叶丛,以提高FAVD重构的可靠性,并可区分全植被植数(TPAI)和LAI。该文论述如?

In sensor networks,data forwarding from multi-source to sink forms a data gathering tree.For this gathering tree an energy-efficient and low-latency LD-MAC protocol was proposed to solve the conflict of energy-efficient and low-latency in previous MAC protocols.On one hand,LD-MAC adopted asynchronous duty cycle to reduce energy consummation.And on the other hand,by delaying the nodes' sending time and staggering their receiving and sending time hop by hop,it can reduce data forwarding latency.The...

In sensor networks,data forwarding from multi-source to sink forms a data gathering tree.For this gathering tree an energy-efficient and low-latency LD-MAC protocol was proposed to solve the conflict of energy-efficient and low-latency in previous MAC protocols.On one hand,LD-MAC adopted asynchronous duty cycle to reduce energy consummation.And on the other hand,by delaying the nodes' sending time and staggering their receiving and sending time hop by hop,it can reduce data forwarding latency.The analysis and simulations show that LD-MAC can solve the conflict efficiently.

传感器网络中数据从多个源节点向sink节点的转发形成数据汇集树,针对此汇集树提出低能耗低延时的LD-MAC(Low-Delay MAC)协议,解决以往MAC协议中能耗和延时的矛盾问题。LD-MAC一方面采用异步duty cycle机制降低能耗,另一方面,从源到sink节点的转发路径上的节点逐个推迟帧的发送起始时间,依次进行接收与发送,减少数据在传输过程中的延时。分析和实验表明LD-MAC较好地解决了能耗和延时的矛盾问题。

 
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