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开采解放层是最有效的区域性防突手段,目前在我国的煤矿开采中被广泛采用,但有些矿井的所有煤层均为突出煤层,不具备开采解放层的条件。本文将煤层底板岩层作为下解放层,运用深孔预裂爆破技术对其进行爆破。先在煤层底板岩层中打一定数量的爆破孔和控制孔,通过爆破使爆破孔和控制孔实现裂隙贯通,形成一定尺寸的空腔,从而利于煤层卸压和瓦斯抽放。本文以天府矿业公司三汇三矿为工程背景,运用有限元计算软件LS-DYNA确定了爆破孔和控制孔间形成贯通空腔的最大孔间距为0.7m。数值模拟结果与现场考察相近。 相似文献
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埕岛油田馆上段储层为曲流河沉积,并细分为7种沉积微相,储层非均质研究表明馆上段层内、层间和平面均表现出较强的非均质性。研究认为,沉积微相对储层非均质有明显的控制作用,主要表现在沉积微相对砂体和油层的展布、孔渗的变化、层内非均质性、夹层和微观孔喉分布上。此研究为埕岛油田调整方案的制定提供了地质依据。 相似文献
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通过-490南11层一区274特厚煤层放顶煤高瓦斯工作面瓦斯治理的三个阶段,阐述了高位孔、仰斜孔、顶板巷、多套移动瓦斯抽放系统综合治理瓦斯的效果和经验。 相似文献
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绥芬河市澳普尔广场及酒店改扩建工程位于低山丘陵地区,基坑挖深12M～21.8M属于深基坑,开挖深度范围内的土层第三和四层为强风化安山玢岩和中风化安山玢岩,岩块坚硬,机掘不易;基坑东、南侧与原有4层和9层建筑最小距离分别为2.4m和3.5m,位于凸入基坑的阳角处,属不利位置,施工和支护监测难度较大。依据本场地岩土工程地质条件、场地条件、基坑开挖深度,边坡在无相邻建筑采用土钉墙结构支护体系;在有相邻建筑采用悬臂桩结构支护体系即人工挖孔桩和土层锚杆相结合的支护方式,人工挖孔桩施工遇安山玢岩配合风镐进行施工,土层锚杆采用ф150螺旋钻成孔。岩石采用地质钻机与风动潜孔锤成孔。监测结果显示,基坑关键部位变形各项指标均未达到预警值。 相似文献
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鸡西矿业集团公司梨树煤矿二水平14#层地质条件复杂引起瓦斯涌出不均衡。因此在施工14#下三皮带道时,根据该区域瓦斯涌出量实际情况,采用合理分配风量、本层超前预抽钻孔、工作面检验孔、探断层孔同时在相邻巷道施工穿层钻孔预抽煤巷条带煤层瓦斯等方法,取得了良好的效果。对矿井今后进行防治煤与瓦斯突出积累了宝贵经验。 相似文献
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铪金属有良好的抗腐蚀性能,不易受一般酸碱水溶液的侵蚀,可作为高级食品的金属罐包装材料当前研究没能有效地从电化学测试的角度定量掌握铪金属在包装中的配比和对磷酸二酯菌的抑制性能的关系,导致了原材料浪费,包装材料对磷酸二酯菌的抗菌效果不好。研究铪金属罐包装材料对磷酸二酯菌抑制电化学分析,通过电化学测试方法分析铪金属包装产品对菌落的抑制性能和腐蚀性能的关系,研究极化电阻随测试溶液体积的变化,得出饮料实罐对磷酸二酯菌抑制的线性极化曲线,分析包装材料孔尺寸调控对磷酸二酯菌抑制和吸附性能的影响和关系,对铪金属罐包装材料的设计和配比具有改良作用。 相似文献
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Paul L. Wolf 《Indian journal of clinical biochemistry : IJCB》1999,14(1):59-90
It is important that clinicians and laboratorians, including clinical chemists and pathologists, recognize and understand
the clinical significance of abnormal liver function tests. The liver regulates many important metabolic functions. Hepatic
injury is associated with distortion of these metabolic functions. Hepatic disease can be evaluated and diagnosed by determining
serum concentrations of a number of serum analytes. Many serum analytes exist to assist in the biochemical diagnosis of liver
disease. The focus of this paper is on the analytes which are associated with hepatic necrosis, cholestasis, defects in excretion
and end stage hepatic disease which results in decreased synthetic function. The abnormalities of these serum analytes will
be correlated with the important types of liver disease. 相似文献
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This paper aims at time-series prediction of disease counts when the trend changes unexpectedly. There is a body of literature in time-series analysis that focuses on improving the prediction when a change in the trend is observed. Following this line of literature, a method was recently proposed that outperforms the previous proposals. To utilize this method for prediction of disease counts, the present study employs a commonly used method called local estimators for estimation near boundaries. This provides two advantages for disease count prediction. First, the prior method is limited to only smooth trend changes. However, the current study using local estimators also encounters abrupt changes. Taking both smooth and abrupt changes into account is important in predicting disease counts, because, for variety of different reasons, such as vaccination programs, the disease counts may encounter abrupt changes. Second, the current study, despite the previous approach, can also model uncertainty. The parameter uncertainty plays a significant role when predicting disease counts. Compared to current literature, the proposed method outperformed to predict counts for 12 diseases in Nevada. The paper demonstrates that the proposed methods improved the prediction Q-Score in comparison to both outbreak and structural change methods available in literature. Although this method has been specifically demonstrated for prediction of disease counts, it can be generalized for different applications. With the recent utilization of analytics techniques and the increased use of time-series analysis in information systems, the suggested method provides implications for the literature of information systems when predicting with structural trend changes in data. 相似文献
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对田东县存栏母猪10头以上的规模猪场49个进行仔猪腹泻病调查,每个季度调查一次,共调查196个场次存栏仔猪2934头,结果有28个场次发生该病,按场次统计发病率为14.3%;发病猪611头,发病率为20.8%,病死210头,死亡率为7.16%。采集15个发病猪场,每个猪场各采集1份病死猪样品进行检测,每份检测6种病原,结果有11份能检测到病原阳性,阳性率为73.3%,其中检出猪瘟病毒4份,检出率为26.7%;蓝耳病病毒1份,检出率为6.7%;圆环病毒4份,检出率为26.7%;流行性腹泻病毒2份,检出率为13.3%;轮状病毒2份,检出率为13.3%,有1份样品同时检出猪瘟和蓝耳病病毒,所有病料均未能检出传染性胃肠炎病毒。由此可见,田东县仔猪腹泻病由多种病原共同引起。 相似文献
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目前国内外已建设的人类疾病动物模型资源数据库尚未涵盖所有疾病,也无统一的资源查询路径或渠道,为此,探索开发一个较为完整和可以资源共享的人类疾病动物模型数据平台。收集和整理挖掘相关文献、专著、研究机构的人类疾病动物模型资源数据,以促进人类疾病动物模型资源数据整合、挖掘和共享为目标,从系统疾病、动物种属、造模方法3个维度搭建人类疾病动物模型资源共享平台总体架构,在全面性、可扩展性、开放性、稳定性和安全性的设计原则指导下,采用当前主流的B/S结构,引入可扩展标记语言对异构数据进行结构化和标准化处理,再以层次结构法对资源数据进行分类和编码,最后经专家审核通过发布。该平台目前试运行结果显示,既便于用户查找符合需求的数据,同时也保证数据的准确性。 相似文献
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对７１例健康人与８３例冠心病患者体外血栓、血小板聚集功能测定比较，结果证明冠心病患者的体外血栓和血小板聚集明显高于健康人（Ｐ＜０．０１）。 相似文献
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K. Kaur G. Bedi M. Kaur Anil Vij Inderpreet Kaur 《Indian journal of clinical biochemistry : IJCB》2008,23(1):33-37
Coronary Artery Disease is the major cause of mortality and morbidity worldwide. Traditional risk factors account for only
half of the morbidity and mortality from coronary artery disease. There is substantial evidence that oxidative stress plays
the major role in the atherosclerotic process. The present study was undertaken to evaluate the level of lipid peroxidation
(by measuring malondialdehyde) and antioxidant enzymes (ceruloplasmin, glutathione, superoxide dismutase) in coronary artery
disease. Serum malondialdehyde levels and serum ceruloplasmin levels were significantly raised in all the subgroups of study
group as compared to control group (p<0.001). Whole blood glutathione levels and hemolysate superoxide dismutase activity
was significantly decreased in all the subgroups of study group as compared to control group (p<0.001). Above results suggests
that the patients of coronary artery disease show increased oxidative stress and decreased levels of antioxidant enzymes.
So it is recommended that the management protocol for coronary artery disease patients should include antioxidant supplementation
along with simultaneous lowering of lipid peroxidation. 相似文献
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Conclusion Available evidence suggests that we can not dismiss the potential value of nutriceuticals in disease and inhibition of atherosclerosis.
Epidemiologic data suggest that antioxidant supplementation may be associated with a reduced risk of clinical events from
atherosclerosis; howere, interventional trials only support a role for vitamin E in this regard. Many studies suggest that
a link between fruit and vegetables in diet or the amounts of plasma antioxidant vitamins (ascorbic acid, tocopherols and
carotenoids) and risk of death from cancer or coronary heart disease. The usefulness of antioxidant for prevention of cardiovascular
disease is yet to be proven. However, studies offer important insights that together with the development of methods to identify
individuals most likely to benefit, provide hope to clinicians seeking to use antioxidant vitamins with safety and efficacy
for the treatment and prevention of cardiovascular disease. Only continued investigation into the mechanism (s) of action
of candidate agents will determine whether they hold promise as a therapeutic intervention and only then, they can be recommended
routinely to the patients. Thus, nutriceuticals are becoming more widely accepted as an adjunct to conventional therapies. 相似文献
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对１６４８例住院病人检查结果分析表明，１０２倒退行性心瓣膜病的发生率呈现随年龄增长而增多的趋势，７０岁以上患者的发生率为２４．７９％，１０２例患者中，同时并存有其他心血管疾病者为７３例，占７１．５６％。并对退行性心瓣膜病的诊断标准加以探讨。 相似文献
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P. P. Naik M. S. Ghadge A. S. Raste 《Indian journal of clinical biochemistry : IJCB》2006,21(2):100-102
A number of epidemiologic studies has been published in recent years showing an increase risk of death from cancer in subjects
with low plasma cholesterol levels. Although several authors proposed that hypocholesterolemia is predisposing factor for
cancer development, no causative relation has been established so far and that it may be that low plasma cholesterol is secondary
to malignant disease. Hence, the present study was undertaken to examine the lipid profile in children patients with leukemia
and Hodgkin's disease in comparison with age matched controls. The study included 52 normal healthy controls and 105 patients
with leukemia and Hodgkin's disease. Lipid profile included serum cholesterol, HDL & LDL cholesterol and triglycerides. Serum
cholesterol, HDL & LDL cholesterol were found to be inversely associated with incidence of cancer, whereas triglycerides were
significantly elevated in cancer patients. The inverse association between cancer and serum cholesterol may reflect a physiological
response to early undiagnosed stages of cancer. 相似文献
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针对历年长江流域的小麦赤霉病发病的气象指标和统计资料,应用改进型的BP神经网络建立了该地区流域的小麦赤霉病发病的预报模型.实验证明,该改进型的算法利用为变梯度反向传播算法和强大的函数映射的特征,可以建立符合小麦赤霉病发病的气象预报模型,为小麦赤霉病地研究提供科学依据,对指导农业工作具有一定的应用意义. 相似文献