tree

摘要： To enrich knowledge on the growth dynamics of commercial forest species in the Congo Basin, a study was conducted in Cameroon, within a community forest in savannah forest transition zone (Zone 1) and within FMU 10 052 in dense semi-deciduous humid forest (Zone 2). It aimed to obtain, in 8 species, the height (H) of the tree from its diameter (D) more accessible: Entandophragma cylindricum (Meliacea), Eribroma oblongum, Sterculia rhinopetala et Triplochiton scleroxylon (Malvaceae);Erythrophleum suaveolens et Piptadeniastrum africanum (Fabaceae), Milicia excelsa (Moraceae) et Terminalia superba (Combretaceae). The destructive method was used. After felling and flushing out a tree, the dendrometric parameters were measured and/or calculated. In Zone 1, 6 species including T. scleroxylon were calibrated using 30 trees of each. In Zone 2, 45 trees of E. cylindricum, 99 of E. suaveolens and 82 of T. scleroxylon constituted the sample. At the 5% threshold (95% confidence interval), the height-diameter relationship is a linear model. In all species, the height of a tree is predicted by measuring its diameter through linear regression. In Zone 1 regression equation is: H(m) = 28.13 + 19.09 * D(m) for T. scleroxylon;H(m) = 12.35 + 30.38 * D(m) for S. rhinopetala;H(m) = 23.09 + 26.42 * D(m) for E. oblongum; H(m) = 14.86 + 20.92 * D(m) for P. africanum;H(m) = 14.98 + 24.78 * D(m) for T. superba and H(m) = 1.55 + 32.37 * D(m) for M. excelsa. In Zone 2, the relationship is: H(m) = 27.40 + 14.21 * D(m) for T. scleroxylon;H(m) = 7.79 + 20.18 * D(m) for E. cylindricum and H(m) = 20.08 + 9.74 * D(m) for E. suaveolens (probability associated with F < 0.0001). The influence of site parameters (biotic and abiotic) on the height-diameter relationship should be more studied in multilayers forests specifically in the Congo Basin.

摘要： DEAR EDITOR,Cognitive flexibility is crucial for animal survival but is frequently impaired in neuropsychiatric disorders.Although many brain structures and functional networks are involved in cognitive flexibility,the neural mechanisms underlying cooperation among specific functional networks remain unclear from a global perspective.In this study,[^(18)F]-fluorodeoxyglucose positron emission tomography(FDG-PET)was performed on 19 male tree shrews after four different visual discrimination tasks,including baseline,learning expert(LE),reversal naive(RN),and reversal expert(RE).

摘要： Hong Kong has a long history of applying masonry retaining walls to provide horizontal platforms and stabilize man-made slopes.Due to the sub-tropical climate,some masonry retaining walls are colonized by trees.Extreme weather,such as typhoons and heavy rains,may cause rupture or root failure of those trees,thus resulting in instability of the retaining walls.A monitoring and warning system for the movement of masonry retaining walls and sway of trees has been designed with the application of fiber Bragg grating(FBG)sensing technology.The monitoring system is also equipped with a solar power system and 4G data transmission devices.The key functions of the proposed monitoring system include remote sensing and data access,early warning,and real-time data visualization.The setups and working principles of the monitoring systems and related transducers are introduced.The feasibility,accuracy,serviceability and reliability of this monitoring system have been checked by in-site calibration tests and four-month monitoring.Besides,a two-level interface has been developed for data visualization.The monitoring results show that the monitored masonry retaining wall had a reversible movement up to 2.5 mm during the monitoring period.Besides,it is found that the locations of the maximum strain on trees depend on the crown spread of trees.

摘要： The tree shrew,thought to be part of Scandentia,falls in between the rodents and the non-human primates.As a new type of experimental animal,the physiological,biochemical,anatomical structure and genomic properties of tree shrew are closer to non-human primates than rodents.In addition,the tree shrew brain is more developed and has been used in the study of nervous system related diseases,such as cerebral ischemia,spinal cord injury,visual system and dementia.

摘要： Given any infinite tree in the plane satisfying certain topological conditions,we construct an entire function f with only two critical values±1 and no asymptotic values such that f-1([-1,1])is ambiently homeomorphic to the given tree.This can be viewed as a generalization of the result of Grothendieck(see Schneps(1994))to the case of infinite trees.Moreover,a similar idea leads to a new proof of the result of Nevanlinna(1932)and Elfving(1934).

摘要： Jenny:What kind of tree grows in your hand?Anna:A palm tree.(注:palm是"手掌"的意思,而palm tree是一种树,即"棕榈树"。)

摘要： Fred:"Why do elephantswear red nail polish(指甲油)?"Bob:"I don’t know, why?"Fred:"To hide in cherrytrees."Bob:"But I’ ve neverseen an elephant in a cherrytree."Fred:"See, it works."

摘要： Following publication of the original article[1],in the description of the leaf shrinking procedure as well as in Algorithm 1 and the definition of edge-based graphs in[1],the condition that G contains at least two leaves(i.e.,the condition|VL(G)|≥2)needs to be omitted.

摘要： 变革是对梦想的征服。它们拥有世界性的特质而非仅仅占有任何特定的领域。作品《Streeg》是代表着我们所有为争取自由而战的一颗树,是艺术家对人类及人类所创造的所有变革的歌颂。首先,使用青铜在草地上铸造一颗大树。200个各种颜色的铺路石块像奇形怪状的水果一样粘在扭曲的树杈上,它们共同组合形成这一雕塑。

摘要： Tom arrives at the park with his sister Jenny.Jenny:Let’s sit here,under the tree.Tom:OK,I''ll put up the sun umbrellas.Jenny:Wait...my umbrella is too small.Give me the one that you have.

摘要： 本发明涉及一种基于关联分析FP‑Tree算法的企业风险预警方法。构建企业指标数据集，而后运用互熵‑区间套法进行分箱、卡方检验相关性筛选指标，最后运用关联分析FP‑Tree算法进行企业风险预警。本发明不仅能够从单指标数据分析企业风险，也可以综合两个及以上指标数据挖掘企业风险，更全面挖掘企业存在的风险。

摘要： 本发明提供了一种基于MIDS‑Tree的服务故障高响应匹配方法。对多元融合数据集进行选取和去噪；进行面向特定服务故障和降级类型的标签处理，得到多元数据集；对数据集进行故障类型分类，形成多元微服务故障数据集；通过Apriori方法进行面向多类型服务故障的特征和属性提取；根据提取后的特征属性进行特征属性敏感度计算，得出最优特征属性并进行态势分析，得出服务故障特征属性的波动范围；根据态势分析以及服务故障类型信息，进行MIDS‑Tree的建立,并进行服务故障的预测，使得服务的资源利用率最大化。本发明提出的轻量级架构模型，为解决已有服务故障预测方法，存在的模型庞杂、冗余；同时该模型能够快速高响应的进行面向服务故障策略匹配，提高现有模型的响应时间。

摘要： 本发明涉及一种基于geohash与B‑Tree的空间关键词查询方法及装置，本发明方法包括：数据预处理步骤，将数据集D中所有位置点编码成长度为n的字符串string，以string为排序对象按字典序对数据集D中的每行数据排序并生成编号id、标识flag，每一行数据称为一条记录r，则由一至多行记录r组成的数据集称为记录集R；空间关键词索引建立步骤，对string构建B‑Tree；对记录集R中的flag建立倒排索引，其列表元素为关键词及与其相对应的id列表，得到域‑关键词倒排索引结构；空间关键词查询步骤，检索B‑Tree与域‑关键词倒排索引结构，获取满足查询条件的id，经过滤得到id候选集，并对候选集验证返回满足空间查询条件的位置点。本发明可高效支持任意空间范围的关键词查询。

摘要： 本发明涉及CPU‑GPU异构计算，特别是CPU进行大量数据访问时，利用GPU加快索引操作的方法。具体涉及采用GPU高性能B‑Tree的作为索引数据结构，在GPU上实现高效数据缓存的方法。本发明基于目前的GPU高性能B‑Tree作为索引数据结构，来提高数据访问效率，同时针对放置在GPU上的数据量有限的问题，设计实现了一种GPU高效缓存机制，保留小部分热点数据在GPU上，从而减少数据换出，降低CPU与GPU之间的数据通信开销。具体流程如图1所示。本发明的方法包括：利用CUDA内存拷贝将数据放在GPU显存上；在显存上构建B‑Tree作为数据的索引；使用共享内存，采用哈希表缓存热点数据，设置缓存替换机制，减少CPU和GPU之间的数据换入换出频率，加速数据查询，提高缓存命中率。

摘要： 本发明公开了基于LSM‑Tree的数据存储方法及系统，属于数据存储技术领域，本发明要解决的技术问题为如何提高数据库大数据量时的写入性能，同时兼顾读取性能，采用的技术方案为：该方法是利用磁盘的物理特性，在磁盘中顺序写入数据，提高数据写入的速度；并在内存中维护一张索引表，索引表中记录所有存储数据的key对应的value在文件中的位置信息；同时增加闲时数据合并的操作，数据合并时将之前磁盘中的所有数据进行遍历，获取最新的数据内容以及所对应在磁盘中的位置，更新磁盘中存储的数据文件、内存中的索引表以及磁盘中保存的索引表。该系统包括写入模块、维护模块和合并模块。

摘要： 本说明书提供一种LSM‑Tree架构数据库有序表的查询方法，所述查询包括根据查询条件依次扫描一张到多张有序表，对某一张有序表的扫描包括：将所述某一张有序表作为当前有序表；在当前迭代器匹配于当前有序表的类型时，保留当前迭代器；否则获取与当前有序表匹配类型的迭代器作为当前迭代器；由当前迭代器确定本次扫描的目标数据块；当本次扫描的目标数据块与当前缓存数据块是同一个数据块时，保留当前缓存数据块；否则读取本次扫描的目标数据块到缓存中生成新的当前缓存数据块；由当前迭代器根据查询条件扫描当前缓存数据块。

摘要： 本发明公开了一种基于FP‑Tree算法的电网二次设备状态评价指标的信息挖掘处理方法，步聚如下：一、二次设备状态数据收集，构建二次设备的缺陷集;二、FP‑Tree算法应用，具体过程如下：

摘要： 本发明提供一种基于k‑tree优化贝叶斯网络的上位性位点挖掘方法。均匀抽样蒲公英代码，得到每个节点的邻居节点集合，构建对应的特征树结构；利用与k‑clique中节点进行合并组成新节点的方法，构建得到包括大规模SNP位点和表型性状节点的Rényi k‑tree，得到相应的k‑tree；利用基于度选择的树分解算法将k‑tree对应的图分解为不同的k‑clique；利用优化马尔科夫毯的Fast‑IAMB算法获取不同节点的马尔可夫毯，学习得到不同k‑clique对应的子贝叶斯网络结构；合并子网络得到整体网络结构。重复以上步骤，得到包括SNP位点和表型性状节点的网络结构，进而得到影响表型性状的上位性位点。本发明可以帮助生物学研究者得到影响特定表型性状的上位性基因位点，为不同物种复杂数量性状的遗传基础解析提供借鉴。

摘要： 本文提供了涉及存储领域，提供了一种LSM‑tree存储的L0层数据处理方法及装置，根据L0层原容量在持久内存中预留部分区域作为L0层，所述方法包括：确定内存中负载的相关统计信息，其中，所述负载的相关统计信息包括负载写入L0层中各键值的次数；根据负载的相关统计信息及用户设定的并发程度，对L0层数据进行垂直分区，将各分区的起始物理地址写入元数据文件中；根据分区结果及元数据文件，将负载对应数据写入所述L0层，返回重复上述确定内存中待写入L0层的负载相关的统计信息及其之后的步骤。本文能够提高SM‑tree结构中L0层数据的查询及合并效率。

摘要： 本发明公开了一种基于LSM‑tree的KV存储系统读性能的缓存优化方法，包括：在内存中加入：KeyRange Cache，其结构与磁盘上SST的分层结构相同，使得每层的条目都与磁盘上对应层的SST一一对应，每一条目缓存磁盘上对应的SST键范围；BF Cache缓存只有含热数据的SST的布隆过滤器；对数据进行冷热分离；若判别为热数据则将对应的布隆过滤器缓存至BFCache中，并将BFPointer指针指向BFCache；否则将BFPointer指针设为NULL；对指定键为k1进行查询，先依次查询MemTable和Immutable MenTable，若找到直接返回k1的value，若未找到则从低往高逐层搜索KeyRange Cache，若找到包含k1的键范围则判断是否为热数据，继而从磁盘中相应SST找到k1；若此层未找到，则继续往下一层搜索。本发明无需在LSM‑tree上逐层查找，提高读取速度，实现高读取性能。