Results 71 to 80 of about 542 (161)
Theory and method of suitable evaluation for mine environmental positive effects development and utilization [PDF]
Since the economic reform and opening up, the exploitation of mineral resources has made significant contributions to the economic development of China.
Honglei LIU +3 more
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Jianzhu Gangjiegou Jinzhan, 2017 长沙冰雪世界项目依附废弃的矿坑建造,结合建筑师对造型的要求,利用深坑坑壁为岩体的地质条件,主体结构采用支承于矿坑坑壁的三组拱形桁架结构体系,拱形桁架最大跨度为180m。介绍了项目的工程概况、采用平面拱拟合曲面结构的确定过程、拱形桁架及其稳定系统的选型、拱脚基础与岩体的关系及其处理方式等内容,并结合工程特点详细阐述了在复杂边界条件下利用逆吊法进行形态创建的原理与流程。
周健, 张耀康, 王帅, 顾乐明
doaj
[Trapping array-based preparative two-dimensional liquid chromatography for the purification of four components in tobacco leaves]. [PDF]
Se Pu, 2023 Sha YF +7 more
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Connotation, research status, and development directions of clean coal geology in China [PDF]
[Objective] The exploration and assessment of low-carbon, zero-emission, and maximized utilization of coal resources, emerge as a focus of coal geology in the 21st century.
Harold H. Schobert +6 more
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Shuitu Baochi Xuebao, 2011 对于工业废弃地采用苜蓿进行复耕,测定不同种植方式的有机质含量、腐殖质组成形态及胡敏酸的光学特性,比较分析认为:复耕利用苜蓿是恢复地力的有效途径,但苜蓿种植年限以10～15年内改种大田作物较佳.试验研究表明:随苜蓿种植年限延长黄绵土的有机质含量逐步提高,并促进了土壤的熟化;苜蓿地的腐殖质结合形态均为松结态＞稳结态;苜蓿种植5～15年的3个阶段有机碳、腐殖质总量及各组分含量逐渐呈递增趋势,种植苜蓿的土壤HA/FA比值大于1;苜蓿种植年限在5～15年间,土壤胡敏酸向着分子量增大、芳化度提高、结构复杂的方向演化,
马生发, 陈红, 曹宏
doaj
Review of 70 years’ achievements and high-quality development architecture system of surface coal mining in China [PDF]
As an important component of China’s coal industry, surface coal mines have the advantages of large production capacity, low mining costs, and great safety conditions.
Qingxiang CAI, Yanlong CHEN
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[Research progress in nipple projection reconstruction based on tissue graft support]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi, 2023 Zhang X, Deng C.
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退耕还林还草工程的土壤保持效益及其生态经济价值评估--以固原市原州区为例
Shuitu Baochi Xuebao, 2004 退耕还林还草工程的土壤保持效益可以看作是由农田生态系统转变为林草生态系统土壤保持服务功能的增加量。参考国内外关于生态系统服务功能中土壤保持功能的评价方法，采用市场价值法、机会成本法、影子工程法、恢复费用法对固原市原州区退耕还林还草工程土壤保持经济价值进行了估算。退耕还林还草工程的年土壤保持总价值为8634．39万元，其中减少养分损失价值为8148．62万元，减少土地废弃价值为19．43万元，减轻泥沙淤积灾害价值为466．35万元。
李蕾 刘黎明 谢花林
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Jianzhu Gangjiegou Jinzhan, 2014 <正>上海的深坑酒店和迪拜的帆船酒店同时入选世界十大建筑奇迹中的两大酒店类奇迹,被美国国家地理频道《伟大工程巡跟踪报道。深坑酒店位于上海松江区佘山国家旅游度假区,由废弃采石场改造而成,是世界上首个建设于坑内的五星级酒店。项目位于地下负65米,深坑酒店打破传统建筑向上建造的思维定势而往下建,从而创造了独一无二的世界建筑奇迹。
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Zhejiang Daxue xuebao. Lixue banThe tuff mining process produces huge amounts of associated waste stone powder, and the disposal of these powders has been restricting the deep development of mines.
魏泽慧(WEI Zehui) +11 more
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