共查询到20条相似文献,搜索用时 109 毫秒
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概要介绍了樟东坑矿区的主要地质特征,在前人工作的基础上,对矿床的基本特征(尤其是矿脉的变化特征)进行了分析、探讨和总结;利用这些特性及其变化规律,采用一些新的探矿方法不但找到了一些隐伏盲矿,增加了地质储量,延长了矿山的服务年限,而且降低了探矿费用,减少了采矿的盲目性,节约了成本,增加了经济效益。 相似文献
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叙述了天铁动力厂4#空分系统辅助油泵应用EV2000变频器控制系统的过程,对运行中出现的溢油、油压波动不稳等故障现象原因进行了分析,提出了改进方案.改进后消除了故障现象,实现了闭环控制油泵的转速和启停,减小了对电机和电网的冲击和振动,提高了设备的可靠性,延长了电机使用寿命,保障了生产的顺利进行. 相似文献
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为了解决大型制造企业数据中心架构变更后,在数据保护方面所面临的多种难题,对适用的数据保护技术进行了研究探讨.最终实现了企业数据保护平台架构的转型升级,提升了平台自身的安全性,改善了备份数据的传输架构,备份效率提升了10倍以上.实现了备份任务的集中智能管理,节约了备份窗口,实现了备份资源的一次性分配与自动回收,释放了备份... 相似文献
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在矿区钻探工程施工过程中,针对钻探工程的特点及现场施工条件,对受影响的原设计方案进行了优化,全面综合分析考虑,充分利用了一切可以利用的手段和措施,提高了工程的实用性、安全性,降低了工程成本。进一步升华了钻探方案,提高了工程质量,最大程度的减少了工程施工的风险与难度,实现了企业利益最大化,同时保证企业的投资决策质量和经济效益达到了双赢。 相似文献
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济钢中厚板厂3500线粗轧机改造主传动系统采用ACS6000SD变频驱动系统,系统的整流侧和逆变侧采用了对称结构,降低了维护难度;采用了IGCT技术,保证了系统的性能响应;使用了DTC技术,提高了系统的鲁棒性。这种交直交系统做到了对电网的最少谐波运行,既减少了对电网的污染,又省去了无功补偿系统的投资。 相似文献
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介绍了砌炉车的工作原理,围绕其工作原理和使用实践,对其液压系统进行了重新设计,选用了二通流量控制阀,实现了对修炉车三条油缸流量的均衡分配,确保了三个油缸的同步动作,有效地解决了原设计采用的比例分配阀流量分配不均的问题,提高了设备运行的平稳性和可靠性. 相似文献
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Squamous dysplasia in the bronchi has been long recognized as a precursor of lung carcinoma, particularly squamous carcinoma. Atypical adenomatous hyperplasia (AAH) has been recently implicated as a precursor to adenocarcinoma. Bronchiolar neuroendocrine cell hyperplasia has also been suggested as a precursor to some pulmonary carcinoid tumors. The atypical adenomatous hyperplasia-adenocarcinoma sequence has been likened to the adenoma-carcinoma sequence in the large intestine. AAH is commonly multifocal, and may explain multicentricity that is observed with some adenocarcinomas. AAH has been shown to have immunohistochemical, morphometric, flow cytometric and genetic abnormalities overlapping with adenocarcinoma. Bronchiolar neuroendocrine cell hyperplasia (carcinoid tumorlets) is classically associated with inflammatory lesions in the airways, but may also be multifocal and bilateral. In the latter setting, lesions may attain a size greater than 0.5 cm and be (arbitrarily) classified as carcinoid tumors. 相似文献
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Tantalate-columbate concentrate has been studied; namely, its chemical, phase, and granulometric compositions and radioactivity have been investigated. The thermodynamics of reactions of chlorination of the components of the concentrate have been calculated in the temperature range of 400–1273 K. A technique of laboratory chlorination has been developed and experiments have been performed at T = 750 and 800°C. The products obtained have been analyzed. The total degree of chlorination of the concentrate, as well as of tantalum and niobium, has been determined at various temperatures. 相似文献
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Thermal buckling analysis of laminated smart composite plates subjected to uniform temperature distribution has been presented. Shape memory alloy (SMA) fibers whose material properties depend on temperature have been used as a smart material. A three-dimensional layerwise plate model has been employed in developing the system equations using variational approach. Finite-element method has been adopted for discretization of the laminate. Lagrangian interpolation functions have been used to approximate the displacement components along the thickness as well as in the in-plane direction. The actual variation of prebuckling stresses has been accounted for in the derivation of the geometric stiffness matrix of the laminates. An incremental load technique has been used in the analysis to take into account the nonlinearity in the material properties of the SMA arising due to their temperature dependence. The effects of thickness ratio, orthotropic ratio, fiber orientation, aspect ratio, stacking sequence and various boundary conditions on the critical buckling temperature have been examined in details. The results have been validated with those available in the literature. 相似文献
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通过EP系列高频无源性滤波节能装置的应用,消除、吸收了对电气设备产生的高次谐波,清洁电能,提高了电气设备的运行效率,减少突发故障,达到了设备保护和节能的效果。 相似文献
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转炉炼钢全流程温度控制及实施 总被引:1,自引:0,他引:1
根据现场测温数据和工艺操作要求,建立了全流程温度制度。为了实现全流程钢水温度的控制,分别在温度的测量、调节以及生产节奏的配合等方面采取了一些有效措施,避免了由于各工序生产周期不谐调而导致的温降,取得了降低出钢温度、稳定浇铸温度的效果。 相似文献
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Fear and the brain: where have we been, and where are we going? 总被引:1,自引:0,他引:1
J LeDoux 《Canadian Metallurgical Quarterly》1998,44(12):1229-1238
In recent years, there has been an explosion of interest in the neural basis of emotion. Much of this enthusiasm has been triggered by studies of the amygdala and its contribution to fear. This work has shown that the amygdala detects and organizes responses to natural dangers (like predators) and learns about novel threats and the stimuli that predict their occurrence. The latter process has been studied extensively using a procedure called classical fear conditioning. This article surveys the progress that has been made in understanding the neural basis of fear and its implications for anxiety disorders, as well as the gaps in our knowledge. 相似文献
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Direct electrowinning of lead from suspension galena concentrate anode in different electrolytes 总被引:1,自引:0,他引:1
Electrochemical extraction of lead from galena by suspension electrolysis has been examined. Galvanostatic studies with slurry
electrode as well as voltametric studies with carbon paste electrode in various electrolytes have been made in order to evaluate
bath performance. Sodium hydroxide has been found to result in poor dissolution whereas ionic conduction through the electrolyte
as well as oxide formation at the anode hinders lead dissolution in perchlorate media. Acetate bath results in substantial
amount of oxide formation at anode even though solid bed conduction dominates. Sodium chloride bath has been found to have
good prospects for producing lead ions and elemental sulfur with good current efficiencies. 相似文献
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简要介绍国内冶金工业活性石灰应用及生产发展过程,着重介绍套筒竖窑石灰焙烧技术、不锈钢分公司套筒竖窑生产线设计特点.套筒竖窑石灰焙烧工艺合理、产品质量高、窑体设备简单、作业率高、自动化程度高且安全、环保、节能.不锈钢分公司该生产线在设计时从设备、耐材及三电控制系统方面进行了优化.上料设备易磨损处增加了聚氨脂衬板,换热器增加了自动清灰和排灰装置,主排烟风机布置在室外,并采用滑动轴承和稀油润滑;耐火材料选用了镁铝尖晶石砖及高纯莫来石;控制系统选用通用的电气仪表一体的施耐德PLC.这些优化可为国内套筒竖窑技术的推广应用提供新的思路和帮助. 相似文献
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L Prieto Chaparro A Sánchez Díaz J Salinas Casado 《Canadian Metallurgical Quarterly》1997,50(6):579-583
Some of the most dramatic advances in the treatment of cancer have used the immune system in combination with conventional or transplantation chemotherapy. Adoptive immunotherapy has been used for relapses after allogeneic bone marrow transplantation, and it has been particularly effective for chronic myeloid leukemia. Adoptive immunotherapy also has been used for Epstein-Barr virus-related lymphomas developing after allogeneic marrow transplantations. Cellular therapy, including the infusion of tumor-reactive immune cells, has been used to mediate response of established solid tumors. This has been used for therapeutic benefit for renal cell carcinoma, melanoma, lung cancer, and breast cancer. Current research is focusing on reducing the toxicity of these approaches as well as further defining the appropriate target tissue. 相似文献