基于模糊层次分析法的高原矿井人机功效评价

高原矿井人机功效评价是关系到高原高效采矿的重要问题之一,高原地区施工相比平原地区更加复杂。从人员因素、设备因素和环境因素3个方面出发,确立了17个评价指标,以构建高原矿井人机功效评价指标体系。同时,采用层次分析法计算各项指标的权重,并在此基础上建立多层次模糊综合评价模型。以西藏某铜多金属矿为研究对象,构造判断矩阵,建立权重向量和综合模糊矩阵,得出系统隶属度向量。评价结果表明：该系统的人机功效评价结果为“中等”水平,受环境因素影响严重。该评价模型为制定提高人机功效的合理对策提供了科学依据,具有一定的理论意义与实用价值,也为类似的高原施工问题提供了参考。     

基于改进熵权法—未确知测度模型的黄金洞尾矿库综合安全评价

针对尾矿库安全评价中存在的不确定性问题,以黄金洞尾矿库为例,引入未确知测度理论,分析评价对象与评价指标之间的关系,建立一个包含5个影响因素和18个影响因子的尾矿库综合安全指标评价体系,结合基于层次分析法—熵权法综合确定指标权重,构建基于改进熵权法—未确知测度模型.根据该模型的指标评价体系和分级模式确定指标测度函数,代入...     

基于模糊综合评判的稀土La掺杂AgSnO_2触头材料性能评估

为了对掺杂稀土元素La的AgSnO2触头材料性能进行定量化分析,更准确的反应触头材料工作性能,将模糊综合评判应用于触头材料性能评估。采用改进层次分析法(AHP)将主观定性结论定量化,得到主观专家权重,通过客观数据信息得到客观熵权,用拉格朗日乘子优化法对两种权重进行综合权重计算,这样可以充分减少权重计算的主观性,发掘原始数据中所包含的信息量,使各指标权重的确定更加精确。综合评估第二相SnO2粒度对AgSnO2/La2O3触头材料物理和电接触性能的影响,案例分析结果验证了所提方法的有效性和实用性。最后进行物理与电接触性能实验,实验结果与综合评估结果相吻合,进一步验证了该评估方法的可靠性,为今后AgSnO2触头材料的应用提供科学的参考依据与方法。     

基于模糊评价的某倾斜矿体采场结构参数优化研究

采用模糊综合评价方法对某倾斜矿体采场宽度12m、13m、14m三种方案进行优选.通过建立采场结构参数的层次分析模型及其隶属度矩阵,结合现场调查确定技术指标和经济指标,并应用FLAC3D数值模拟获得最大主应力、剪应力、顶板位移等6个安全指标;采用熵值法确定各指标权重和总排序权重,再经多因素(指标)、多目标(方案)模糊综合评判,得出采场宽度13m为最优结构参数.熵值计算结果表明,矿房两帮位移为主要指标,开挖后则应进行喷混支护,此措施对该倾斜矿体的安全开采具有实用价值.     

基于变权联系云的采空区稳定性二维评价模型

针对采空区稳定性评价具有模糊性、随机性以及评价指标等级呈有限区间正态分布等问题,考虑评价指标值突变对评价指标权重的影响,提出了基于变权联系云的采空区稳定性二维评价模型。首先选取12个评价指标构建采空区评价指标体系,并通过各指标联系云图反映其实际分布情况;然后利用博弈论和变权理论得到变权权重;最后计算采空区各评价指标对应等级的确定度和采空区的综合确定度,并根据最大隶属度原则确定采空区稳定性等级。为解决指标等级归属不一致的问题,引入模糊熵作为第二维评价系统,以表征采空区稳定性的复杂度。结果表明:变权联系云模型评价结果与实例应用结果一致,验证了该模型的可行性与合理性。     

70B2风机节能技术改造

兖州矿业(集团)公司南屯煤矿为中央并列抽出式通风系统,主扇风机为70B2 - 2 1No .2 8型轴流式风机。这类风机适用于小等积孔、高负压的矿井,只有矿井负压32 0 0Pa以上才能进入高效区运转。南屯煤矿属于低负压大风量大等积孔的通风矿井,加之风机流道风流摩擦阻力损失,造成风机运行极不合理,为此进行了节能技术改造,并取得了明显的效果。改造中应注意的问题如下:①风叶强度。扭曲叶片板厚为3mm ,与原直板风叶厚度相同,新老风叶支杆直径相同,材质均为4 5 # 钢,故不再进行强度计算,扭曲风叶支杆均进行探伤。②静动平衡。风机运转平衡是十分重…     

一种改进的尾矿库安全和谐度方程评价方法

为了不断提升尾矿库安全管理水平,采用一种改进的尾矿库安全和谐度方程评价方法,对尾矿库进行评价。首先,构建尾矿库安全评价体系,包括9个评价指标;其次,结合熵权法和动态激励法,计算评价指标的权重信息区间、协同调整评价指标值,给出相对贴近度的优劣排序;然后,利用和谐度方程相关理论计算尾矿库和谐度;最后,综合评价结果的和谐度、各指标的优劣排序和安全影响因素,结果给出合理的建议和改善措施。     

高炉软熔带位置状态的二级模糊综合评判

通过对高炉生产过程参数进行提取、分类,提出一种基于熵权可拓理论的二级模糊综合评判模型来评估高炉软熔带的位置状态的方法。可拓理论通过引入物元的概念建立物元模型,用熵权法计算各物元指标的权重系数,实现定性分析和定量计算相结合对高炉软熔带位置状态的进行综合评判,并以某钢铁厂2 650 m3高炉为实例对其软熔带位置状态进行综合评判,得出与现场实际情况反映的状态相吻合的评判结果。     

基于熵权综合模型的大型铜镍矿开采隧道瓦斯安全等级综合评价

为准确预测和评价大型铜镍矿开采隧道的瓦斯安全等级,基于熵权理论建立大型铜镍矿开采隧道瓦斯安全评价综合指数模型,选取了国内十座大型铜镍矿开采隧道作为瓦斯安全等级评价模型的对象,选取了5个分级指标作为大型铜镍矿开采隧道瓦斯安全等级的判别指标,利用熵权理论能够获得各评判指标的权重的特点,通过综合指数评价模型可以得到各大型铜镍矿开采隧道瓦斯安全等级预测值并对其进行排序,研究结果表明:其评价结果与实际情况较为符合,其评价结果客观、合理,具有良好的应用性。     

基于云模型的矿井热害评价体系研究

为科学地评价矿井热害情况,使热害治理更具有针对性,研究分析了矿井热害影响因素,并以此构建二级热害评价指标体系;采用IOWA算子改进的层次分析法确定评价体系各指标的权重,减少评价的主观性偏差;最后通过云模型理论结合各指标权重对矿井热害情况进行评价,得出矿井的热害等级及其影响因素。以金渠金矿为例对该评价体系进行验证,结果表明使用该评价体系获得的结果科学合理,可为矿井热害评价提供参考。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

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。     

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.     

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)     

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.