Results 81 to 90 of about 2,893 (150)
Shuitu Baochi Xuebao, 2020 土壤团聚体的数量和质量直接影响着土壤性质和有机碳固存。研究不同施肥措施及施肥年限对采煤塌陷区复垦土壤团聚体的重量分布比例及其稳定性的影响，可为该区农业生产和土壤质量提升提供科学依据。采集复垦6，11年定位试验不同施肥处理耕层（0—20 cm）土样，选取不施肥（CK）、平衡施氮磷钾化肥（NPK）、单施有机肥（M）、有机无机肥配施（MNPK）4个处理，利用干筛法和湿筛法获得4种粒径的团聚体/粉黏粒组分（> 2，0.25~2，0.053~0.25，< 0.053 mm），用>0.25 mm团聚体的含量（R0 ...
谢钧宇 +7 more
doaj
Zhendong Ceshi yu Zhenduan为研究聚酰亚胺（Kapton）膜材应力松弛性能，对其进行了不同初始应变（0.02、0.2、0.4、0.6）和不同温度（23、50、80、110和140 ℃）的应力松弛试验，获得了材料在各种工况下的应力松弛曲线及应力保持率数据，并用经典Maxwell模型、广义Maxwell模型和分指数模型进行拟合。研究表明：Kapton膜材有明显的非线性和应力松弛特性；应力松弛过程中最大应力和稳定应力随着初始应变的增大而增大，随着温度的增大而减小；应力保持率随着温度和初始应变的增大而减小 ...
doaj +1 more source
Study on mechanical behaviors of buried FRP pipeline under geological sedimentation [PDF]
Objective Compared to conventional metal pipelines, fiber-reinforced plastic (FRP) pipelines demonstrate superior strength and lightweight properties. They have been progressively integrated into the station gathering and transmission segment within oil ...
Cong WANG +5 more
core +1 more source
Study on evaluation technology of coal seam roof water hazard risk with protection coefficient [PDF]
Regarding the issue of determining the thickness of the protective layer for waterproof and safe coal (rock) pillars in mining near water bodies, Appendix 4-3 of the “Code for Retaining and Mining Coal Pillars in Buildings, Water Bodies, Railways, and ...
Bo LYU +4 more
core +1 more source
Numerical analysis on energy-reducing and outburst-eliminating mechanism in coal mass with reaming and cavitation [PDF]
Hydraulic flushing technology had been widely used in the process of gas enhanced extraction in soft coal mass. However, few studies had revealed the energy-reducing and outburst-eliminating mechanism in hydraulic flushing coal mass from the perspective ...
Di ZHANG +8 more
core +1 more source
Shuitu Baochi Xuebao[目的] 土壤侵蚀阻力反映了土壤抵抗侵蚀的性能,包括细沟可蚀性(Kr)和土壤临界剪切力(τc)。通过水槽冲刷试验探究不同土地利用类型下土壤侵蚀阻力差异及其主控因素,为揭示东北黑土区土壤侵蚀动力机制提供理论基础。[方法] 在黑龙江省嫩江市鹤山农场鹤北小流域选取7种典型的土地利用类型,利用水槽冲刷试验测定土壤分离能力,拟合了Kr和τc,采用相关分析和偏最小二乘回归方法,确定影响土壤侵蚀阻力的主要因素。[结果] (1)不同土地利用类型样地Kr为0.003~0.372 s/m,道路Kr最高,与农地相比,草地 ...
张宁, 张光辉, 邢书昆
doaj
Experiment of precipitation-driven dynamic compaction technology in the treatment of silty clay sites: A case study of Yangluo project in Wuhan [PDF]
Traditional soft foundation treatment methods often prove ineffective for muck clay soil foundations. This study investigated the reinforcement mechanism and construction process parameters of a novel dewatering-intensive tamping technique using the ...
Mingqing LAN
core +1 more source
Shear strength and crushing characteristics of calcareous sand in South China Sea under the influence of three factors [PDF]
Calcareous sand, a type of marine soil found in the South China Sea, is characterized by its porous nature, irregular particle shape, and susceptibility to breakage. However, few studies have examined the mechanical properties of calcareous sand from the
Hao YANG +3 more
core +1 more source
Zhongguo shiyan zhenduanxue, 2014 目的研究复方樟柳碱注射液对眼底病患者血液动力学的影响。方法选择我院眼科2011年2月至2012年11月收治的183例眼底病患者,根据病因分为视网膜静脉阻塞组（A组）、急性缺血性眼底病组（B组）、糖尿病性眼底病组（C组）和高血压性眼底病组（D组）,均给予复方樟柳碱注射液治疗,在患眼侧行颞浅动脉旁皮下和球后交替注射,1次/d。分别于治疗前后测定血流变学指标并进行比较分析。结果患者经治疗后,血黏度、血浆黏度、红细胞聚集指数、红细胞比容和纤维蛋白原均较治疗前显著降低,且有统计学差异 ...
王雪燕
doaj
Influence of fine-grained soil and loading rate on the mechanical behavior of soil rock mixtures [PDF]
Soil-rock mixtures are widely used in engineering for filling and subgrade applications, with their mechanical behavior playing a critical role in the stability and safety of engineering structures.
Anjing LUO +6 more
core +1 more source