Susceptibility assessment of debris flow disaster based on machine learning models in the loess area along Yili Valley [PDF]
The Yili Valley, located on the border between China and Kazakhstan, serves as the juncture of North and South Xinjiang, and stands as a pivotal outpost on the Silk Road Economic Belt.
Mingyang WU +5 more
core +1 more source
Zhongguo youzhi为实现藻油中ω-3多不饱和脂肪酸（ω-3 PUFAs）的简单、绿色、高效分离纯化工艺，首先利用裂殖壶菌原始菌株及定向驯化菌株ALE40为原料提取油脂，通过优势性评估及细胞通透性对比二者提油效果，并通过测定油脂指标对比3种提油方法(酸解法、超声干法、超声湿法)优劣。对超声湿法提取的粗藻油采用酯交换法进行乙酯化后，联合尿素包埋法和分子蒸馏技术富集高浓度二十碳五烯酸（EPA）和二十二碳六烯酸（DHA），对酯交换及尿素包埋工艺条件进行单因素实验优化,通过对分子蒸馏重相DHA和EPA含量测定确定分子蒸馏级数 ...
杨玲1，2，欧莹1，2，秦宇1，2，杨海麟1，2 YANG Ling1,2, OU Ying1,2, QIN Yu1,2, YANG Hailin1,2
doaj +1 more source
Shear characteristics and mesoscopic damage mechanism of long time soaking red sandstone under loading and unloading conditions [PDF]
The bank slope rock mass below the flood control restricted water level (145 m) in the Three Gorges Reservoir area has experienced long-term immersion in the process of reservoir water lifting and lowering; the water level changes lead to the rock mass ...
Binghao ZHOU +4 more
core +1 more source
Development and Application of a Multifunctional Sensor,Technique for Monitoring of the Corrosion of Reinforcement in Concrete Construction and Study of Corrosion Control [PDF]
, 2010 钢筋腐蚀引起的钢筋混凝土结构过早退化不仅造成巨大的经济损失，而且还关系到资源、环境、安全、国计民生及可持续发展等一系列重大的经济和社会问题。钢筋在混凝土中是否发生腐蚀主要依赖于混凝土内部化学环境，混凝土碳化和氯离子侵蚀是引起钢筋去钝化和发生腐蚀最主要的环境因素。混凝土是典型的气-液-固三相共存的多尺度不均匀的复杂体系，与一般开放体系钢的腐蚀显著不同，钢筋在混凝土中的腐蚀过程更为复杂，研究更为困难。为了更加全面、准确地测量混凝土中关键性环境因素的变化和钢筋在混凝土中的表面钝态、腐蚀趋向及腐蚀速度 ...
董士刚
core
The Terraced Walls Significantly Influence the Spatial Distribution of Soil Water in Terraced Areas on the Loess Plateau [PDF]
[Objective] Converting slopes into terraces is a crucial soil and water conservation and agricultural measure on the Loess Plateau. Understanding the impact of terraced walls on soil water is conducive to preserving soil water and enhancing terrace ...
BAI Chenyun +5 more
core +1 more source
Effect of emulsified asphalt on engineering properties and toughening effect of ultra-high performance concrete [PDF]
At present, cracking is the main form of damage to ultra-high performance concrete (UHPC), and increasing flexural toughness is the primary technical approach to addressing this issue.
Guilian ZOU +4 more
core +1 more source
Road Performance of Mica Powder Modified Asphalt Mixture [PDF]
This is an article in the field of ceramics and composites. In order to investigate the basic road performance of mica powder modified asphalt mixture, modified asphalt with 0%, 3%, 5%, 7%, 9%, and 11% content was prepared.
Chao FENG +4 more
core +1 more source
Shuitu Baochi Xuebao, 2001 对环洞庭湖丘岗生态系统水环境要素的定位观测和小流域水平衡监测研究表明 :环洞庭湖丘岗地区水资源总量丰沛 ,可利用的集雨水量为现今农业用地最大灌溉水需求量的 2 .4 1倍 ,可维持生态系统的水量平衡。但由于雨水的季节性配置差异 ,系统水分有季节性富余与亏缺 ,一般年份 3月中旬至 7月上旬水富余 3 11.3 mm ;8月上旬至 9月下旬水亏缺 13 4 .7mm。天然降水大约 76%产生派生资源参与系统水分循环 ,其余部分主要以径流形式溢泄入下游水域。这一过程使该地区每年流失或向洞庭湖水域输送水 1 ...
谢小立 王凯荣
doaj
Study on the Effect of pH Values on the Corrosion Mechanism of Reinforcing Steel [PDF]
, 2009 钢筋腐蚀是导致钢筋混凝土构筑物提前失效的首要原因，而混凝土碳化引起其孔隙液pH值降低是导致钢筋腐蚀的主要因素之一。因此，研究混凝土碳化（即介质pH值降低）对钢筋腐蚀电化学行为的影响具有重要的意义。本工作应用实验室自行研制的扫描微参比电极原位测量系统和光电流谱测量系统，结合其他电化学技术和表面分析方法，研究模拟混凝土孔隙液pH值对钢筋腐蚀行为和钝化膜半导体特性的影响；同时模拟混凝土碳化，考察混凝土中钢筋的腐蚀电化学行为。主要研究内容和结果如下： (1)应用扫描微参比电极技术（SMRE ...
徐晖
core
Strength and fracture evolution characteristics of high fill canal levee soil [PDF]
The splitting strength is one of the important factors affecting the stability of soil slope. Due to the different water sensitivity of different soils, the strength and deformation of soils under different water contents are different.
Huaichang YU +4 more
core +1 more source