自强水库库区工程地质评价与坝线选址研究

自强水库位于陕南秦巴山地中低山地貌区,水库为镇巴县备用水源地及旅游观光风景区,属小(1型水库。通过对库坝区地质构造、地层岩性、岩溶发育等工程地质条件分析可知,对工程建设及坝线选址有影响的工程地质问题主要为库区内发育逆冲叠瓦小断裂以及岩溶发育可能导致水库渗漏等。库区内无大型活动性断裂构造,构造较为稳定,且库区蓄水范围小,蓄水量不大,不易诱发地震。而拟选坝址位于自强河段,沟谷对称顺直,综合水库坝址区地形地貌、工程地质等条件进行坝线比选,推荐下游坝线为较为理想的坝线位置,可满足工程建设要求。     

王家庄北沟多金属矿区钻探施工技术

在河北省承德县王家庄北沟钼多金属矿钻探施工中,钻遇岩石以燧石条带白云岩、石英岩为主,岩石可钻性级别高,钻遇地层硬、脆、碎,钻头打滑严重,孔壁坍塌和漏失,钻进效率极低。为提高钻进效率,经取样分析岩性后,专门定制了适用于该地层的钻头。采用了多种方法迫使钻头出刃,并根据不同孔段地层岩性选择不同钻进工艺参数和钻井液体系。总结出适于本矿区地层的钻进工艺参数,使用不同性能的钻井液,起到了较好的护壁堵漏作用,提高了钻进效率。     

基于层次分析法的盐穴储气库选址评价方法研究

随着我国盐岩地下储气库大规模兴建的开始,如何对各目标盐矿区进行储气库库址的评价和优选已成为国内储气库建设面临的首要问题。在对盐穴储气库选址的影响因素进行详细归类和分析的基础上,应用层次分析法建立盐穴储气库选址综合评价体系的目标层次结构模型,并结合专家调查法,确定了该模型中18项基本指标在整个选址评价体系中所占的权重。综合本领域专家的意见和相关的理论研究成果,提出了选址体系中各基本指标的适宜度等级划分标准,以及库址综合适宜度等级评价标准,综合各指标的权重计算结果,建立了目标库址综合建库适宜值P的计算公式,为我国盐穴储气库库址的评价和优选提供了可行方法和理论依据。将该方法应用于湖北云应盐矿的盐穴储气库库址评价中,评价结果与专家论证意见一致,表明了该方法的合理性。     

Response to selection for fast growth in the second generation of Pacific oyster (Crassostrea gigas)

Mass selection for fast growth was conducted in three Pacific oyster (Crassostrea gigas) stocks from China, Japan and Korea using previously established lines (CS1, JS1, and KS1). To determine whether continuous progress can be achieved by selection for growth, the progeny of three second-generation Pacific oyster lines was selected for shell height and evaluated via a 400-day farming experiment. When harvested at the end of the experiment, the selected crosses of CS2, JS2, and KS2 lines grew by 9.2%, 10.2% and 9.6% larger than the control crosses, respectively. During grow-out stage, the genetic gain of three selected lines was (10.2 ± 1.4)%, (10.4 ± 0.3)%, and (8.4 ± 1.6)%, respectively; and the corresponding realized heritability was 0.457 ± 0.143, 0.312 ± 0.071 and 0.332 ± 0.009, respectively. These results indicated that the selection for fast growth achieved steady progress in the second generation of oyster. Our work provides supportive evidence for the continuity of the Pacific oyster selective breeding program.     

Morphological comparison between a selected fast-growing strain and the common cultured strain of turbot Scophthalmus maximus

To evaluate the effect of genetic improvement of the turbot Scophthalmus maximus, we analyzed morphological differences between a fast-growing strain obtained by family selection and the common cultured strain, by principal component analysis, stepwise discriminant analysis, and t-tests. Although they clearly differed morphologically, plots of the principal components of the two strains partially overlapped. However, the difference between the strains was supported with very high precision by discriminant analysis. The t-tests revealed that 4 of the 13 morphological traits analyzed were highly significantly different (P<0.01), 4 traits also differed significantly (P<0.05), and the remainder did not differ significantly. The coefficients of difference of the 13 traits were all lower than the threshold value between subspecies (1.28). Together, the results indicate that a trend for segregation of characters from the common cultured strain have already appeared in the selected fast-growing strain but the degree of segregation have not risen to subspecies level.     

江西地区有感地震史记

通过搜集江西省各地方史志地震记载,在前人研究基础上,给出江西省历史有感地震的筛选原则和确定方法,整理分析相应有感地震,并在中国有感地震目录中提取江西有感地震,删减重复部分,增补遗漏的史志有记载的有感地震,从而编辑江西地区相对完整的历史有感地震目录。     

兰溪地磁台观测新址堪选

介绍浙江省兰溪地磁基准台场址堪选工作过程及计算结果,并介绍背景噪声和密跨度和跨度等常规测试过程,进行新址与杭州台记录数据之间的对比分析,通过科学计算和分析,确定新址取代旧址的科学性,为相似工作提供参考。     

A homogeneity-based feature selection algorithm for regionalization of watersheds

ABSTRACT

An algorithm is proposed to find an appropriate selection of available watershed features for the regionalization of watersheds. Also, the algorithm is able to determine an appropriate number of regions for regional flood frequency analysis. The proposed algorithm is applied to data related to the Karun-e-Bozorg basin in the southwest of Iran. The results show that the proposed algorithm is efficient to find an appropriate selection of watershed features and an appropriate number of regions for regionalization, in the study area. It decreased the number of assessed regionalization states from 1020 to 252. In addition, applying the proposed algorithm mostly improved the accuracy of flood quantile estimates in the study area. The performance of the algorithm was evaluated through Monte Carlo simulation experiments. The results indicate that the efficiency of the algorithm increases by increasing the number of available watershed features.     

滑（边）坡稳定性评估探讨

滑（边）坡稳定性评估不仅取决于计算方法本身,更主要的取决于计算参数的选取是否合理,力学参数的选取是否合理将直接关系到所建立的滑（边）坡稳定性评估体系的成败。在根据试验结果等综合确定（潜在）滑动面的黏聚力、内摩擦角的取值区间和建立计算模型基础上,对滑（边）坡反算力学参数时不同发育条件下稳定系数的选取和稳定性计算方法的确定进行了较深入研究,提出了一整套滑（边）坡力学参数的综合选取方法和稳定性评估体系,并以某滑坡为例进行了实际工程应用。采用数值模拟和物理模拟对所建立的稳定性评估体系进行了验证,其工程适用性良好。     

基于克隆选择原理的核爆地震特征选择方法

为了解决核爆地震自动识别中最优特征子集的选择问题,根据克隆选择原理,提出了一种过滤与封装相结合的特征选择方法.该方法融合了封装式与过滤式特征选择方法的优点,利用局部化的类别可分性判据来处理核爆地震样本的多峰分布问题,通过设定独立的记忆抗体能够保证最终结果是搜索过的最佳特征组合,并且可以处理设定和不设定最优特征子集维数两种情况下的特征选择问题.首先通过UCI数据集中呈多峰分布的玻璃数据验证了该特征选择方法的有效性,进而将其应用到核爆地震特征选择中.核爆地震特征选择实验结果表明,该方法不仅有效地降低了特征空间的维数,而且使分类精度提高了2个百分点,与封装式特征选择方法相比,该方法的计算复杂度大为降低.