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用钢筋混凝土人工假顶成功地解决露天转地下开采问题
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作者 胡庆森 郭清云 王廷禹 《黄金》 CAS 北大核心 1989年第7期48-49,共2页
大水清金矿位于内蒙喀喇沁旗境内,属旗国营矿山,原采选能力为70吨/日,扩建后可达到150吨/日。 大水清金矿二采区的I—2号矿体是矿区主要矿体,赋存于含矿蚀变带中,地表连续出露长150m,平均斜深91m,平均厚3.65m,倾角75°—80°,... 大水清金矿位于内蒙喀喇沁旗境内,属旗国营矿山,原采选能力为70吨/日,扩建后可达到150吨/日。 大水清金矿二采区的I—2号矿体是矿区主要矿体,赋存于含矿蚀变带中,地表连续出露长150m,平均斜深91m,平均厚3.65m,倾角75°—80°,矿体直接围岩为蚀变斑状花岗岩,岩石多断裂构造、破坏强烈,挤压现象明显,岩石大部分具碎裂、碎斑结构,形成破碎带,节理裂隙极发育,因蚀变强裂。使岩石各种物理强度大大降低,样品无法取样,矿山掘进巷道必须边支护边掘进,一般是两璧一顶全部密集支护,时而还发生坍塌冒落现象。 展开更多
关键词 混凝土 假项 地下开采 金矿
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综采工作面过漏顶区方法的探讨
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作者 刘满意 王星亮 《矿业快报》 2005年第4期37-38,共2页
依据雁崖矿井下采煤工作面过断层漏顶区的实际施工过程,分析了采煤工作面顶板破碎的特点,介绍了该矿综采工作面人工假顶及锚杆、锚索等支护材料在漏顶区的应用方法,并提出了一些个人观点。
关键词 工作面漏 人工假项 锚杆 锚索 护帮 初撑力
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Semiparametric estimation of average treatment effect through a random coefficient dummy endogenous variable model 被引量:2
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作者 ZHOU YaHong WANG LiMing HE XiaoDan 《Science China Mathematics》 SCIE 2014年第11期2415-2428,共14页
This paper provides an estimation procedure for average treatment effect through a random coefficient dummy endogenous variable model. A leading example of the model is estimating the effect of a training program on e... This paper provides an estimation procedure for average treatment effect through a random coefficient dummy endogenous variable model. A leading example of the model is estimating the effect of a training program on earnings. The model is composed of two equations:an outcome equation and a decision equation.Given the linear restriction in outcome and decision equations,Chen(1999) provided a distribution-free estimation procedure under conditional symmetric error distributions. In this paper we extend Chen's estimator by relaxing the linear index into a nonparametric function,which greatly reduces the risk of model misspecification. A two-step approach is proposed:the first step uses a nonparametric regression estimator for the decision variable,and the second step uses an instrumental variables approach to estimate average treatment effect in the outcome equation. The proposed estimator is shown to be consistent and asymptotically normally distributed. Furthermore,we investigate the finite performance of our estimator by a Monte Carlo study and also use our estimator to study the return of college education in different periods of China. The estimates seem more reasonable than those of other commonly used estimators. 展开更多
关键词 random-coefficient model endogenous variable model SYMMETRY
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Therapeutic observation of Gao's nape acupuncture plus swallowing training for pharyngeal deglutition disorder after stroke 被引量:9
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作者 Liu Xiao-ping Chen Fei-yu +1 位作者 Chu Jia-mei Bao Ye-hua 《Journal of Acupuncture and Tuina Science》 CSCD 2019年第1期37-43,共7页
Objective: To observe the clinical efficacy of Gao's nape acupuncture plus swallowing training in treating pharyngeal deglutition disorder after stroke. Methods: One hundred patients with post-stroke pharyngeal de... Objective: To observe the clinical efficacy of Gao's nape acupuncture plus swallowing training in treating pharyngeal deglutition disorder after stroke. Methods: One hundred patients with post-stroke pharyngeal deglutition disorder were randomized into a treatment group and a control group, with 50 cases in each group. The two groups both received routine neurological intervention. In addition, the treatment group was given Gao's nape acupuncture plus swallowing training, while the control group was intervened by swallowing training alone. After eight-week treatment, the two groups were observed in terms of the changes in repetitive saliva swallowing test (RSST), modified water swallowing test (MWST), standardized swallowing assessment (SSA) and swallowing-related quality of life (SWAL-QOL). The clinical efficacies of the two groups were also compared. Results: After treatment, the RSST grading, and scores of MWST, SSA and SWAL-QOL changed significantly in both groups (P<0.05 or P<0.01). The RSST grading, and scores of MWSX SSA and SWAL-QOL in the treatment group were significantly different from those in the control group after treatment (P<0.05 or P<0.01). The total effective rate and markedly effective rate were respectively 100.0% and 72.3% in the treatment group, versus 97.9% and 34.0% in the control group. There was a significant differenee in the markedly effective rate between the two groups (P<0.01). The differenee in the clinical efficacy between the two groups was statistically significant (P<0.01). Con elusion: Gao's n ape acupu ncture plus swallowi ng training is an effective approach for post-stroke phary ngeal deglutiti on disorder. Its therapeutic efficacy is more significant than that of swallowing training alone. 展开更多
关键词 Acupuncture Therapy Gao's Neck Acupuncture STROKE Poststroke Syndrome Pseudobulbar Palsy Deglutition Disorders Stroke Rehabilitation Activities of Daily Living
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