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Satisfactory technical and economical benefits have been achieved in recovering rib-pillars by VCR method in Fan Kou Lead and Zinc Mine. The paper gives a comprehensive description on Small-scale crater-blasting tests, big diameter longhole drilling techniques, charging procedure and blasting method of spherical charges, Safety considerations and ore-drawing operating for exploiting highly sulfidic ore-deposits. Some technical problems regarding further improvement of this method are also presented.

凡口铅锌矿用VCR法回采间柱的试验取得了良好的技术经济效果。本文就这一研究课题在小型爆破漏斗试验、大直径深孔凿岩技术、球状药包的装填工艺和爆破方法、高硫矿床开采的安全技术以及放矿等方面作了全面介绍,并提出了进一步完善这一方法的有关技术问题。

The crux of VCR (Vertical Crater Retreat) mining technology ties in selecting the drilling and blasting parameters, which are derived from crater blasting tests in the site of mining area. A brief account about C.W. Livin-stong's crater blasting theory and its application in VCR has been given in this paper. Summing up the experience of VCR mining both in Fan Kou Lead and Zine Mine and blast tests in Jin Chuan's No. 2 Mine , the selection of drilling and blasting parameters using in VCR mining method and the...

The crux of VCR (Vertical Crater Retreat) mining technology ties in selecting the drilling and blasting parameters, which are derived from crater blasting tests in the site of mining area. A brief account about C.W. Livin-stong's crater blasting theory and its application in VCR has been given in this paper. Summing up the experience of VCR mining both in Fan Kou Lead and Zine Mine and blast tests in Jin Chuan's No. 2 Mine , the selection of drilling and blasting parameters using in VCR mining method and the tests of crater blasting in undergr ound metal mines are described in detail.

VCR法采矿技术的关键之一在于凿岩爆破参数的选择,而爆破漏斗试验是确定其爆破参数的基本方法。本文简要地叙述了C.W.利文斯顿爆破漏斗理论在VCR法回采爆破中的应用,并结合凡口铅锌矿VCR法回采爆破以及金川二矿区爆破漏斗试验体会,介绍了VCR法凿岩爆破参数选择依据和地下金属矿山爆破漏斗试验的具体做法。

The testing of bridging faults (short circuits) hag become increasingly important with the increasing density in LSI (large scale integration) and VLSI (very large scale integration) chips. In this paper we study the feedback bridging faults (FBF) between inputs and the output by using a new model for sequential machines. The necessary and sufficient conditions for generating oscillation and asynchronous behavior in a feedback bridging faulty network are given. It is shown that any feedback bridging faults between...

The testing of bridging faults (short circuits) hag become increasingly important with the increasing density in LSI (large scale integration) and VLSI (very large scale integration) chips. In this paper we study the feedback bridging faults (FBF) between inputs and the output by using a new model for sequential machines. The necessary and sufficient conditions for generating oscillation and asynchronous behavior in a feedback bridging faulty network are given. It is shown that any feedback bridging faults between primary inputs and the primary output in any general combinational networks can be betected by using only two test patterns. Next, we show that by using the patterns for detecting stuck-at faults, bridging faults between internal lines inside a combinational network can be detected. A procedure is presented to derive the complete test set for detecting both bridging and stuck-at faults in fan-out free combinational networks.

本文主要研究数字电路输入和输出端之间的反馈短路故障(feedback bridging fault,简称FBF)及其测试方法.利用一个新的时序机模型提出了一个带有反馈短路故障电路产生振荡或变成一个稳定异步时序电路的充分必要条件.证明了在任何组合电路中,只需两个测试码便能测试出所有可能的初级输入与输出端之间的短路故障.其次,证明了检测固定型故障的测试码(集)也能检测反馈短路故障。同时提出了一个产生完全测试集的方法,它可以同时测试无扇出(fan-out free)电路中的固定型和短路型故障.

 
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