浅谈倾斜薄矿脉的开采方法

本文简要概述了在开采倾斜薄矿脉中遇到的困难,结合当前我国黄金矿山所应用常见的几种开采方案,针对目前存在的问题,探讨了以电耙振动出矿留矿全面法和微型铲运机水平分层充填法两种采矿方法的实用性。     

矿仓口轻型惯性振动放矿机设计的若干问题

结合实际介绍了矿仓口轻型惯性振动放矿机设计过程中应注意的问题，对放矿机安装方式的确定、给矿量的匹配、结构设计中的具体问题提出了解决办法。     

龙岗区生活垃圾分类现状及对策研究

通过调查深圳龙岗现有城市生活垃圾分类现状和收运模式,分析其存在的问题和成因,提出深圳市龙岗区生活垃圾分类处理的策略。     

工业生态型金属矿床开采模式

矿产资源开发为人类的发展提供了原材料的同时,也不可避免地会损耗资源、扰动和破坏地表环境。发达国家的实践经验表明,传统的末端治理不是一种有效的矿山环境治理方案。探讨了基于工业生态学观点的金属矿床开采模式,以期提高资源效率,消除矿床开采对环境造成负面影响的4大危害源,消除矿山闭坑后的末端治理工程,使矿山在生产过程中保持矿区完整生态体系。     

数据结构内排序之比较

本文主要通过对几种排序算法简单介绍并进行比较分析,最后得出一定指导意义的结论。     

Identification,Isolation, and Characterization of Melanocyte Precursor Cells in the Human Limbal Stroma

Given their vital role in the homeostasis of the limbal stem cell niche, limbal melanocytes have emerged as promising candidates for tissue engineering applications. This study aimed to isolate and characterize a population of melanocyte precursors in the limbal stroma, compared with melanocytes originating from the limbal epithelium, using magnetic-activated cell sorting (MACS) with positive (CD117/c-Kit microbeads) or negative (CD326/EpCAM or anti-fibroblast microbeads) selection approaches. Both approaches enabled fast and easy isolation and cultivation of pure limbal epithelial and stromal melanocyte populations, which differed in phenotype and gene expression, but exhibited similar functional properties regarding proliferative potential, pigmentation, and support of clonal growth of limbal epithelial stem/progenitor cells (LEPCs). In both melanocyte populations, limbus-specific matrix (laminin 511-E8) and soluble factors (LEPC-derived conditioned medium) stimulated melanocyte adhesion, dendrite formation, melanogenesis, and expression of genes involved in UV protection and immune regulation. The findings provided not only a novel protocol for the enrichment of pure melanocyte populations from limbal tissue applying easy-to-use MACS technology, but also identified a population of stromal melanocyte precursors, which may serve as a reservoir for the replacement of damaged epithelial melanocytes and an alternative resource for tissue engineering applications.     

酒钢桦树沟铁矿石智能分选机预选抛废试验研究

采用X射线透射智能分选技术对酒钢桦树沟铁矿石进行预选抛废处理,结果表明,抛废率13％左右时,能够取得尾矿品位小于10％、铁回收率大于96％、预选粗精矿铁品位提高3.6个百分点以上的指标,试验结果稳定、数据可再现,说明利用该智能分选机可以实现酒钢镜铁山桦树沟铁矿石的有效预选抛废、提高铁矿石输出品位.     

FAULT-TOLERANT DESIGN OF BATCHER–BANYAN CLASS ATM SWITCHES

Many proposed packet switching systems for high-speed networks have employed the Batcher–banyan fabric due to its modular structure, self-routeing functionality, and distributed conflict-resolving mechanism. In this paper, we present a systematic fault-tolerant design for the Batcher–banyan class of switches. Our first concern is the development of an on-line error detection mechanism which is the prerequisite of any effective fault tolerant operation. Based on the technique developed by Davis, we propose a general fault-testing technique and verify it for a variety of unique-path self-routeing networks. Furthermore, we extend this method to Batcher sorting networks and construct a fault-tolerant Batcher sorter. Lastly, after contemplating the technique constraints and system performance, we deploy the above techniques into different levels of the Batcher–banyan networks and achieve a fault-tolerant version of the StarBurst switch, a member of the Batcher–banyan class of switches.     

聚合物驱偏心分质注入技术

大庆油田主力油层聚驱结束后,聚驱驱替对象已转向渗透率更低、层间差异更大的二、三类油层,分注技术面临着新的矛盾。高渗透率油层需要控制注入量,同时要降低粘损率;低渗透油层要适当降低相对分子质量和粘度,以保证不堵塞油层又有足够的注入速度。为此,研究了聚合物驱偏心分质注入技术,可实现对分层相对分子质量、注入量的双重调节,并在注聚区块开展了现场试验,见到了明显效果。     

机场行李分拣系统中异构数据库迁移的实现

文章描述了首都机场行李自动分拣系统中异构数据库系统DECRDB与Oracle间数据迁移的设计和实现。基于异构数据库的数据迁移思想,系统采用OracleRDBODBC、OracleRDBWorkbench建立DECRDB数据库与Oracle数据库的物理连接,运用PowerBuilder提供的数据管道技术编程实现数据的自动迁移。