In the event of natural disasters, Sierra Leone like any other country loses lives as well as properties and natural resources. Despite notable occurrences of small disasters in the country, only on August 14th sugarl...In the event of natural disasters, Sierra Leone like any other country loses lives as well as properties and natural resources. Despite notable occurrences of small disasters in the country, only on August 14th sugarloaf landslide and the resulting flash flood (twin disasters) which affected Regent and other communities in 2017 have captured both national and international attention due to their alarming impacts. To obtain a better knowledge on the nature of the disasters, this research considered the geological context of the landslide and focused on statistical analysis of the impacts of the twin disasters using Statistical Package for Social Sciences (SPSS). Geological field-based approach and self-administered questionnaires of both closed and open-ended questions, personal interviews and observations were adopted as research techniques. Descriptive statistics and qualitative analysis were used to analyze the data of the research. Relevant literature from books, journals, and newspapers was also consulted, including Radio, Television discussions and the internet. Slope destabilization that caused the Landslide was linked to the geology of sub-surface formation (highly weathered olivine gabbro), lineaments and the rate of weathering. Study showed remarkable economic, social and political impacts as a consequence of the twin disasters. Study also revealed that families assisted the most in both financial and non-financial ways to the victims, and renowned misappropriation of donated disaster funds. All variables tested using student t-distribution and chi-square test of independence accepted the hypothesis. Information obtained from this work could be fundamental for policy makers and development practitioners (Osuteye & Leck, 2017).展开更多
In this article, we studied the bearings made by one company in Shanghai. Through statistical process controlling the quality characteristic of bearings’ diameters and multi-vary analysis is applied to find the key v...In this article, we studied the bearings made by one company in Shanghai. Through statistical process controlling the quality characteristic of bearings’ diameters and multi-vary analysis is applied to find the key variation factors which have an influence on the quality characteristic of the bearings, the quality level of the bearings of this company is improved.展开更多
为建立地表移动的概率积分法计算参数与地质采矿条件之间的数学关系,以我国主要矿区的大量地表移动观测站实测数据为原始数据,采用逐步回归的方法建立了开采沉陷概率积分法参数与地质采矿条件之间的统计回归公式。采用中误差和威尔莫特...为建立地表移动的概率积分法计算参数与地质采矿条件之间的数学关系,以我国主要矿区的大量地表移动观测站实测数据为原始数据,采用逐步回归的方法建立了开采沉陷概率积分法参数与地质采矿条件之间的统计回归公式。采用中误差和威尔莫特一致性指数(WIA,Willmott’sIndex of Agreement)对回归公式的精度及预测能力进行评定,计算结果表明所建立的回归公式误差较小,各参数回归公式均具有较好的泛化性能。为进一步验证所建立的回归公式的正确性,以4个测试样本数据进行计算,计算结果与实测结果吻合。最后,以淮北某矿地表移动实测数据为例,计算结果表明采用统计规律所计算的概率积分法参数进行开采沉陷预计计算可以得到与实测相符的地表移动变形数据。研究成果为缺少实测资料矿区进行开采沉陷预测确定概率积分法参数提供了科学依据。展开更多
文摘In the event of natural disasters, Sierra Leone like any other country loses lives as well as properties and natural resources. Despite notable occurrences of small disasters in the country, only on August 14th sugarloaf landslide and the resulting flash flood (twin disasters) which affected Regent and other communities in 2017 have captured both national and international attention due to their alarming impacts. To obtain a better knowledge on the nature of the disasters, this research considered the geological context of the landslide and focused on statistical analysis of the impacts of the twin disasters using Statistical Package for Social Sciences (SPSS). Geological field-based approach and self-administered questionnaires of both closed and open-ended questions, personal interviews and observations were adopted as research techniques. Descriptive statistics and qualitative analysis were used to analyze the data of the research. Relevant literature from books, journals, and newspapers was also consulted, including Radio, Television discussions and the internet. Slope destabilization that caused the Landslide was linked to the geology of sub-surface formation (highly weathered olivine gabbro), lineaments and the rate of weathering. Study showed remarkable economic, social and political impacts as a consequence of the twin disasters. Study also revealed that families assisted the most in both financial and non-financial ways to the victims, and renowned misappropriation of donated disaster funds. All variables tested using student t-distribution and chi-square test of independence accepted the hypothesis. Information obtained from this work could be fundamental for policy makers and development practitioners (Osuteye & Leck, 2017).
文摘In this article, we studied the bearings made by one company in Shanghai. Through statistical process controlling the quality characteristic of bearings’ diameters and multi-vary analysis is applied to find the key variation factors which have an influence on the quality characteristic of the bearings, the quality level of the bearings of this company is improved.
文摘为建立地表移动的概率积分法计算参数与地质采矿条件之间的数学关系,以我国主要矿区的大量地表移动观测站实测数据为原始数据,采用逐步回归的方法建立了开采沉陷概率积分法参数与地质采矿条件之间的统计回归公式。采用中误差和威尔莫特一致性指数(WIA,Willmott’sIndex of Agreement)对回归公式的精度及预测能力进行评定,计算结果表明所建立的回归公式误差较小,各参数回归公式均具有较好的泛化性能。为进一步验证所建立的回归公式的正确性,以4个测试样本数据进行计算,计算结果与实测结果吻合。最后,以淮北某矿地表移动实测数据为例,计算结果表明采用统计规律所计算的概率积分法参数进行开采沉陷预计计算可以得到与实测相符的地表移动变形数据。研究成果为缺少实测资料矿区进行开采沉陷预测确定概率积分法参数提供了科学依据。
