基于灰色关联度分析的爆破参数优化研究

为了探寻露天台阶爆破最优孔网参数,根据矿山以往的爆破经验,初步确定了6个孔网参数方案,并进行了现场试验,对爆破后的炸药单耗、根底、大块率进行了统计,以灰色关联度分析方法为基础,对6个不同孔网参数的爆破方案的爆破效果进行了评价,根据最大关联度判别准则,确定孔网参数为4.5 m×4 m的方案为最优方案。本研究为露天矿中深孔爆破参数的选取提供了科学依据。     

南芬露天矿岩石爆破孔网参数优化的实验研究

爆破孔网参数是露天矿生产的主要技术指标,通过生产实践对本钢南芬露天矿剥岩爆破参数进行了优化研究,结果表明：适当增大孔网参数可以提高现有设备的劳动生产率,降低炸药单耗和生产成本,对露天矿具有重要意义。     

铜坑矿中深孔凿岩爆破参数优化试验研究

为优化铜坑矿92#矿体凿岩爆破参数,进行了单孔爆破漏斗试验、孔网参数以及徽差间隔时间对比试验.经过综合分析,最终推荐铜坑矿Ф65 mm扇形中深孔凿岩爆破参数为:炸药单耗1.168 kg/m3,最小抵杭线1.2 m,孔底距1.5 m,微差间隔时间50ms.     

新桥硫铁矿凿岩爆破参数优化研究

本文通过数值模拟并利用室内模型试验研究,对新桥硫铁矿水平分层充填采矿爆破孔网参数的进行优化,确定合理的微差延期时间为25~50m s,梅花形布孔等爆破参数。认为目前在-270m中段E25采场二分层生产爆破的孔间距过小,造成矿岩爆破的平均炸药单耗过大。通过数值模拟及试验给出的建议平均炸药单耗比现用的降低了近50%,且孔间距比原来增大,使得钻孔工作量大大降低,极大地降低了生产成本。     

狮子山铜矿中深孔爆破参数优化设计研究

狮子山铜矿的中深孔爆破炸药单耗大 ,大块产出率高。本文在系列爆破漏斗试验的基础上 ,对该矿的爆破参数进行了优化设计研究。研究采用了国内外正广泛探讨的小抵抗线的爆破技术 ,在保持孔网面积S =a·Wd(孔间距×抵抗线 )和单位炸药消耗量基本不变的情况下 ,减小抵抗线Wd,增大孔间距a ,使炮孔的密集系数m(m =αWd)增大。适当变化a和Wd 的值 ,可使爆炸能充分利用 ,从而降低炸药单耗和大块率     

岩体主结构面控制爆破技术在矿山的应用试验

首钢建材化工厂应用岩体主结构面控制爆破技术在矿山进行了试验。试验结果表明：延米爆破量提高了５４．５％；炸药单耗降低了２２．１％，并优化了主要孔网参数，取得了显著的经济效益。     

大孔距小排距的孔网参数在中深孔爆破中的应用

天铁集团的石矿厂多年来爆破效果不理想，粉矿率高，通过对爆破孔网参数的优化，采用大孔距、小排距的孔网参数在中深孔爆破中取得了较好的效果。     

大孔距小抵抗线爆破技术在石灰石矿的应用

大孔距小抵抗线爆破技术使爆破漏斗角增大,产生有利于反射拉应力增加及速度场分布的弧形自由面,爆破能量利用率高,爆破效果好。鸡西露天石灰石矿爆破以8 m×2.3 m大孔距小抵抗线的孔网取代了原来的4.5 m×4 m的孔网参数,进行了多排孔微差爆破,取得了明显的经济效益。     

矿山采场爆破优化技术研究

文章针对矿山采场爆破情况,通过分析目前爆破工作存在的不足,主要从孔网布置的几何参数、爆炸能量参数及合理微差时间最大限度优化爆破设计,以实现最优爆破的目的。     

白云铁矿主采场逐孔起爆爆破参数的优化

文章详细介绍逐孔爆破机理以及与逐孔爆破机理相匹配的孔网参数,经过技术经济比较,说明逐孔爆破对提高爆破质量的优越性和降低爆破成本的作用.     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.