A diversified multiobjective GA for optimizing reservoir rule curves     

Li Chen  James McPhee  William W.-G. Yeh 《Advances in water resources》2007

The paper develops an efficient macro-evolutionary multiobjective genetic algorithm (MMGA) for optimizing the rule curves of a multi-purpose reservoir system in Taiwan. Macro-evolution is a new kind of high-level species evolution that can avoid premature convergence that may arise during the selection process of conventional GAs. MMGA enriches the capabilities of GA to handle multiobjective problems by diversifying the solution set. Simulation results using a benchmark test problem indicate that the proposed MMGA yields better-spread solutions and converges closer to the true Pareto frontier than the nondominated sorting genetic algorithm-II (NSGA-II). When applied to a real case study, MMGA is able to generate uniformly spread solutions for a two-objective problem involving water supply and hydropower generation. Results of this work indicate that the proposed MMGA is highly competitive and provides a viable alternative to solve multiobjective optimization problems for water resources planning and management.  相似文献   

基于元模式的空间关联规则挖掘方法     

吕曹芳  庞宇 《国土资源信息化》2006,(3):24-27

空间关联规则可以从空间数据库中发现空间对象之间的隐含的、不明确的空间关系。空间数据库中空间关联规则挖掘研究是空间数据挖掘和知识发现(SDMKD)的主要内容,其主要问题是多层,多关系的规则发现问题。本文把元模式与空间关联规则挖掘相结合介绍了挖掘地理信息系统(GIS)中空间数据库关联规则的常用步骤方法。  相似文献   

海拉尔盆地贝尔凹陷油气成藏模式与有利勘探方向   总被引：1，自引：0，他引：1  

白雪峰 《世界地质》2014,33(2):439-447

贝尔凹陷是海拉尔盆地富油凹陷之一,油气资源丰富,受多期构造运动改造,油气成藏条件复杂。研究表明,贝尔凹陷经历了"早、中、晚"三期成盆及南屯组末、伊敏组末两期改造的构造演化过程。每期"成盆与改造"对油气成藏起着关键性作用。有效烃源岩控制了油气分布范围;纵向上发育三套储盖组合。南屯组自生自储型组合为主要勘探层系;发育缓坡反向断阶带、复式箕状断陷间的断裂隆起带及保存条件好的小深洼槽三种成藏模式。油气成藏主控因素及富集规律的认识明确了贝西斜坡带南部、苏德尔特构造带南部及贝东洼槽群为下步重点勘探方向。  相似文献   

数据挖掘在地质环境评测中的应用     

李佳  李潇 《城市地质》2014,(4)

本文通过关联规则,挖掘某个区域中化学元素对地质环境影响的变化趋势,为我们提供化学元素对地质环境影响度的预测,并根据预测结果做出管理决策,实验结果表明,该方法预测精度较高。  相似文献   

甘肃省文县阳山金矿带成矿地质特征及找矿方向     

李建忠  刘洪波  李勇  刘多林  陈泽太 《矿产与地质》2010,24(3):193-197

阳山金矿是近年来在川、陕、甘金三角地区发现的浅成低温热液型金矿床,研究和总结阳山金矿带的成矿特征对指导下步勘查和面上找矿具有重要意义。  相似文献   

海洋浮游甲藻中文属名的研究          下载免费PDF全文

马新  潘玉龙  徐金涛 《海洋科学》2023,47(3):66-78

物种中文名,即物种学名的中文译名,在生物专业领域和科学普及等方面起着重要的作用。然而,长期以来对海洋浮游甲藻中文名的重视程度不够且拟定时缺乏统一的标准,导致现有海洋浮游甲藻的中文名比较混乱,甚至很多属缺少中文译名,不利于国内同行科研交流、管理部门决策处置及科普宣传等。本文以AlgaeBase藻类数据库中收录的海洋浮游甲藻的有效拉丁名为基础,系统梳理了中文浮游植物文献书籍中的海洋浮游甲藻中文属名,参照已报道的中文拟名规则,通过溯源考证、参考形态学特征等方式规范了部分浮游甲藻的中文属名。结果显示,海洋浮游甲藻共计152个属,其中有77个属有唯一的中文名报道,且被广泛应用,予以保留;有12个属有两个及以上的中文名,且使用比较混乱,结合文献及这些属的形态特征,为之拟定了比较合理的中文名;有63个属暂无中文名,依据其建立时的文献资料,详细考证其拉丁属名的来源、原始含义及其形态特征描述,为其拟定了较为合理的中文属名,以供参考。  相似文献   

Anti-corruption and corporate environmental responsibility: Evidence from China’s anti-corruption campaign     

《Global Environmental Change》2022

Taking advantage of China’s vigorous anti-corruption campaign implemented in 2013, this study examines the impact of anti-corruption activities on the corporate environmental responsibility (CER) performance of listed Chinese enterprises from 2010 to 2016. The empirical analysis employs a Difference-in-Differences design to identify the causal effect by using the anti-corruption campaign as an exogenous policy shock. Results indicate that China’s unprecedented anti-corruption campaign launched in 2013 significantly improves the CER performance of high-corruption enterprises. Such an effect is most evident for state-owned enterprises, especially local government-owned ones and those in pollution-intensive industries. These results remain after a series of robustness tests. The mechanism results suggest that the promotion effects of the anti-corruption campaign on CER performance can be achieved through environmental regulations, corporate rent-seeking, and innovation behaviors. Moreover, anti-corruption improves the profitability of enterprises, but the effect is significantly offset by increased CER activities.  相似文献