Results 11 to 20 of about 19,407 (163)
Shuitu Baochi Xuebao, 2021 降雨是引起土壤水蚀的主要动力因子之一，为探讨韶关市不同量级降雨对土壤水蚀特征造成的影响，选取1951—2018年韶关市逐日降雨量数据，采用日降雨侵蚀力模型计算降雨侵蚀力，利用变异系数、趋势系数分析不同时间尺度各量级降雨侵蚀力的变化。结果表明：（1）68年来韶关市年均降雨侵蚀力为9 314（MJ·mm）/（hm2·h·a），变异系数为0.29，属于中等变异；（2）年降雨量、降雨日数、侵蚀性降雨量和降雨日数均呈上升趋势，而非侵蚀性降雨量和降雨日数则呈下降趋势，且暴雨量和暴雨侵蚀力呈较明显上升趋势 ...
吴洁玲 +4 more
doaj
Integrative Conservation, EarlyView.This research reveals the functional stability of mixed species foraging flocks (MSF) and their foraging height change with different taxonomic differences along the elevational gradient at Knuckles Montane Reserve, Sri Lanka. This offers new insights into how MSFs sustain with the elevational gradients supporting the altitudinal shifting species ...
Vimukthi. R. Gunasekeara +3 more
wiley +1 more source
Dizhen xuebao基于四川省姑咱台的钻孔应变观测数据，研究了2013年4月芦山MS7.0地震的应变异常。首先通过时间序列分解法去除芦山地震前后（2011年1月至2014年1月）观测数据的长期背景趋势和周期趋势，其次采用多通道奇异谱分析法分解数据，去除水位和气压引起的应变响应，最后提取应变数据中的震前负熵异常。结果表明：水位与水位应变响应的相关系数为−0.97；有96.1%天的日气压与其应变响应的相关系数的绝对值大于0.9，验证了本文环境响应去除算法的有效性；负熵异常累积与贝尼奥夫应变累积的一致性表明，震前4 ...
Kaiguang Zhu +7 more
doaj +1 more source
Effects of Micro-topography Modification on Soil Moisture Dynamics in Cold and Arid Mining Areas of Southern Piedmont of Tianshan Mountain [PDF]
, 2023 [Objective] The effects of spatial and temporal dynamics of soil moisture on micro-topography modification (0—50 cm) were determined in order to provide a scientific basis and theoretical support for land reclamation and ecosystem reconstruction in cold ...
Lai Chengyun +5 more
core +1 more source
Rare Metals, EarlyView.ABSTRACT Porous NiTi alloys are widely used in biomedical and engineering fields. Using the PBF‐LB technique, the TPMS and Voronoi porous parts with a porosity of ∼67% and a minimum feature size of 0.15 ± 0.02 mm were fabricated. Although the bulk sample fabricated with the same parameters is defect‐free, μ‐CT reconstruction on the porous sample ...
Wen‐Hao Zeng +7 more
wiley +1 more source
Evaluation of the Up-to-date Approach SBA for Measurement of Water Leaving Radiance [PDF]
, 2015 SBA(Skylight-blockedapproach)是新近提出的直接测量离水辐亮度Lw的方法(Leeetal.,2013)。该测量方法是由表面之上法改进而来。辐亮度光谱仪镜头处安装上一个蔽光元件——遮光锥，测量时遮光锥的末端稍稍插入水中但光谱仪镜头保持在水面之上。如此一来，遮光锥将水面反射的光完全阻挡，来自水中的辐亮度穿过水面后自然转变为Lw并被光谱仪所接收，从而实现了由光学传感器直接获得Lw的突破。传统的测量方法，包括剖面法和表面之上法，只能测量相关参数，然后通过物理模型计算得到Lw。然而 ...
陈旭磊
core
Temporal and Spatial Evolution of Ecological Sensitivity at Coal Mining Cities in a Karst Region During 2000—2020 [PDF]
, 2022 [Objective] The temporal and spatial evolution characteristics of ecological sensitivity in a typical coal mine resource city (Liupanshui City in Guizhou Province) in a karst region from 2000 to 2020 were analyzed in order to provide a basis for the ...
Chai Jiaojiao +3 more
core +1 more source
Rare Metals, EarlyView.ABSTRACT This study introduces novel nonequiatomic TiZrCoCrMoCux (x = 0, 5, 10; at%) medium‐entropy alloys (MEAx) tailored for orthopedic implants, synergistically combining the biocompatibility of Ti‐based alloys, the wear resistance of CoCrMo alloys, and the antibacterial/osteogenic attributes of Cu. The alloy's microstructure, mechanical properties,
Hang Yu +9 more
wiley +1 more source
Preparation and Preliminary application of Dextran Quantitative Detection Kit [PDF]
, 2016 右旋糖酐（Dextran），又名葡聚糖，由Leuconostocmesenteroides等微生物产生的酶聚合葡萄糖而成或葡萄糖通过化学聚合而成。右旋糖酐广泛应用于医药、食品、化工等领域。在医学领域的应用主要包括：作为血浆体积扩张剂，作为抗凝剂，以及作为渗透压调节剂用于相关的疾病治疗。一般机体组织细胞并不能直接利用右旋糖酐，主要从尿液排出，右旋糖酐使用过量会引起急性肾衰竭、充血性心衰竭、肺水肿及血小板减少等毒副作用。因此，监测血液、尿液的右旋糖酐含量是指导右旋糖酐用量的重要指标 ...
王生育
core
Rare Metals, EarlyView.ABSTRACT Low conductivity, slow ion‐diffusion, and limited reactive sites are common problems in electrocatalysts and electrode materials. In this study, a complex NiTe–CoTe heterojunction with abundant Te vacancies embedded in N, P, and F co‐doped hollow carbon nanorods (NiTe1−x–CoTe1−x/NPFC) was fabricated via a simple ionic liquid‐assisted ...
Mingjie Yi +7 more
wiley +1 more source