排序方式: 共有17条查询结果,搜索用时 15 毫秒
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高密度电法在白云西矿地下水勘探中的应用 总被引:1,自引:0,他引:1
露天矿地下水富集区直接影响爆破质量与边坡的稳定,利用高密度电法对白云西矿采场地下水的空间分布状态、含水层发育规律进行了详细勘探,为采场地下水的防治与开发利用提供科学依据。 相似文献
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冻结基岩施工过程中的关键是冻结壁的安全,充分应用光面爆破技术,保证冻结壁安全,以提高安全生产效率、速度和经济效益。对类似情况具有一定的指导意义。 相似文献
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研究地下聚合物溶液的流变特性时,采用流变仪测量出的结果并不能表示其流变特性,本文采取设计实验的方法,分析了多孔介质中聚合物溶液的流变特性,以便于进一步提高聚合物驱的原油采收率。 相似文献
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Threshold proxy re-encryption( PRE) authorizes the data access right of data subject to multiple proxies, who authorize the right again to delegatee to accomplish the end-to-end data encryption process from storage to authorization. Based on threshold PRE algorithm, in order to build a complete trusted data storage and authorization system, the four protocols, which are data access protocol, authorization proxy protocol, authorization proxy cancellation protocol and data reading authorization protocol, are defined completely. On that basis, an efficient data searching method is constructed by specifying the data delegatee. At last, to ensure the right to know of data, the audit log is processed with trusted data right confirmation based on distributed ledger technology. Meanwhile, a parallel data right confirmation processing method is defined based on hierarchical derivation algorithm of public and private key. In the end, the performance evaluation analysis of the protocol are given. Trusted data access and authorization protocol is convenient to build a complete data processing system on the premise of protecting data privacy based on public cloud storage system or distributed storage system. 相似文献
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芹菜是我国人民喜食的蔬菜品种,中国栽培的主要有“本芹”,即中国芹菜,叶柄较细长,有白芹、青芹,品种很多。近些年从国外引入,已广泛栽培并深受百姓喜爱的"西芹",叶柄宽厚,单株叶片数多,重量大,可达1kg以上。 相似文献