Results 11 to 20 of about 441 (158)
Key n‐Gram Extractions and Analyses of Different Registers Based on Attention Network
Journal of Applied Mathematics, Volume 2021, Issue 1, 2021., 2021 Key n -gram extraction can be seen as extracting n‐grams which can distinguish different registers. Keyword (as n = 1, 1‐gram is the keyword) extraction models are generally carried out from two aspects, the feature extraction and the model design.
Haiyan Wu +5 more
wiley +1 more source
Long Narrative Songs from the Mongghul of Northeast Tibet: Texts in Mongghul, Chinese, and English [PDF]
, 2017 Containing ballads of martial heroism, tales of tragic lovers and visions of the nature of the world, Long Narrative Songs from the Mongghul of Northeast Tibet: Texts in Mongghul, Chinese, and English is a rich repository of songs collected amongst the ...
Li, Dechun (Translator) +1 more
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Ecological Value of Multi-scale Cultivated Land Protection and Compensation Standards in Watersheds [PDF]
, 2023 [Objective] The ecological value of cultivated land and compensation standards at multiple scales in a watershed was measured and analyzed in order to provide scientific reference for improving the compensation mechanism for cultivated land protection ...
Gao Jia, Wang Panpan
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Shuitu Baochi Xuebao, 2020 选取冀北坝上地区防风固沙林为研究对象，通过观测风速、地表粗糙度、临界起沙风速、输沙量、风沙流结构等指标，对比分析3种人工灌木林地（沙棘林地、柠条林地、沙柳林地）防风蚀效果。结果表明：人工植被能够增加地表粗糙度，改变近地表风场和风沙流结构，降低风速，减少输沙量，有效防治土壤风蚀。不同人工灌木林地防风蚀效果存在较大差异。从主要观测指标来看，粗糙度和临界起沙风速为柠条林地 > 沙棘林地 > 沙柳林地；输沙量为柠条林地 < 沙棘林地 < 沙柳林地；防风效应为沙棘林地 > 沙柳林地 > 柠条林地 ...
杨越 +5 more
doaj
Shuitu Baochi Xuebao, 2021 为探究不同生态修复模式对露天矿区排土场边坡产流产沙规律的影响，采用野外径流小区试验方法，对矿区排土场边坡不同生态修复模式的产流产沙进行了1个雨季的连续观测。结果表明：（1）研究区降雨年内分配不均，主要集中在汛期7—9月，该时期降雨量占到年均降雨量的77.03%，是年内径流泥沙损失最多的时期。（2）不同生态修复模式与对照（只撒播灌草种子）相比均具有减流减沙效果，但是不同生态修复模式的减流减沙效益有显著差异，减流效果从大到小依次为沙柳网格模式（64.35%）>生态棒模式（56.56%）>生态袋模式（52 ...
薛东明, 郭小平, 张晓霞
doaj
新疆策勒绿洲-沙漠过渡带不同植被下的沙丘形态特征及沉积物粒度分析
Shuitu Baochi Xuebao, 2022 新疆策勒绿洲—沙漠过渡带为典型的极端干旱区,风是最主要的搬运动力,风蚀和沙尘暴对土壤沙粒的搬运和堆积造成了土地沙化和荒漠化。运用回归分析和相关分析方法,探讨不同灌丛沙堆风沙沉积物的沉积规律和沙丘发育的影响因素,对不同植被下的沙丘形态特征及沉积物粒度进行分析。结果表明:(1)在不同植被覆盖度下,柽柳比骆驼刺灌丛沙堆的沙物质粒径分布均匀,柽柳和骆驼刺分选的沙物质粒径最粗分别为高覆盖度下和中覆盖度下,最细均为低覆盖度下。(2)沙丘和障碍物演化过程中,高度、长度、宽度三者之间协同变化,相互影响、相互反馈 ...
何强强 +6 more
doaj
, 2007 通过线粒体Cytb基因全序列分析,探讨了青海湖裸鲤和花斑裸鲤的起源关系及其进化模式.系统发育分析进一步支持了青海湖裸鲤和花斑裸鲤3个mtDNA谱系的划分.形态上具有高鳃耙变异的个体未形成特有的进化枝,证明了第一鳃弓外鳃耙变异并不具有系统发育意义.对青海湖裸鲤和花斑裸鲤进化枝扩散模式的网络分析表明,黄河独有的单倍型A1是一个创立者单倍型,全部青海湖裸鲤的样品来自于它的辐射,而青海湖裸鲤可能仅仅起源于黄河花斑裸鲤两个主要支系中的一个 ...
何舜平 +5 more
core
Response of Soil Respiration to Snowfall in a Kubuqi Salix Plantation Forest of During Freeze-thaw Period [PDF]
[Objective] To investigate the changes of soil respiration in desert ecosystems and its relationship with environmental factors during the spring freeze-thaw period in arid and semi-arid regions, and to provide data support for the carbon budget of sandy
LAN Xiaozhen +8 more
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Plant nutrient‐acquisition strategies contribute to species replacement during primary succession
Journal of Ecology, Volume 113, Issue 4, Page 988-1003, April 2025.Pioneer species Hippophae acquires phosphorus and nitrogen mainly by ‘mining’ and N2‐fixing strategies and thus dominates in the beginning of primary succession. As soil nutrient availability increases with the mobilization of apatite‐P and input of N‐rich plant residues, Hippophae' strategies become less efficient than Populus's scavenging strategies.
Xiao‐Long Li +12 more
wiley +1 more source
NOx formation of biomass co-firing with coal in two-stage drop-tube furnace [PDF]
The co-firing of biomass with coal is one of the technologies to reduce the carbon emission from the coal-fired power plant. The position of biomass co-firing has a significant impact on NOx emission during the co-firing process.
Falin CHEN +4 more
core +1 more source