太阳能海水淡化技术   总被引：6，自引：0，他引：6  

苏润西 《海洋技术学报》2002,21(4):27-32

文章论述应用太阳能集热和太阳能光伏发电系统进行蒸馏淡化和膜法淡化的海水淡化方法。与传统动力源和热源相比 ,太阳能具有安全、环保等优点 ,将太阳能采集与脱盐工艺两个系统结合是一种可持续发展的海水淡化技术  相似文献   

基于IABC优化LSSVR的变形预测研究     

冯腾飞  刘小生  钟钰  于良 《大地测量与地球动力学》2019,39(1):98-102

针对最小二乘支持向量回归机（LSSVR）中惩罚参数c和核函数参数σ难以确定，以及标准人工蜂群算法（ABC）易陷入局部最优、收敛速度慢等问题，提出一种改进的人工蜂群算法（IABC）来优化LSSVR的参数并进行变形预测研究。首先，IABC算法利用反向学习策略生成正反2个种群来增加初始群体的多样性，一次迭代后对双种群的当前最优食物源进行信息交换以实现优中选优，并设计食物源自适应权重函数及适应度自适应选择函数平衡ABC的勘探和开发能力；其次，以LSSVR的预测精度为目标函数，并将其转化为IABC的适应度函数，以此构建出基于IABC优化LSSVR的预测模型；最后，以基坑监测数据为例，将IABC优化的LSSVR模型、ABC优化的LSSVR模型以及基于PSO的组合模型进行预测对比分析。结果表明，IABC增加了种群的多样性，提高了收敛精度，基于IABC优化的LSSVR模型预测的变形趋势更符合实际，预测精度高于对比模型。  相似文献   

Numerical simulation and experimental research on air reverse circulation bit interior fluid territory     

Shuqing HAO  Hongwei HUANG  KunYIN .School of Civil Engineering  Tongji University  Shanghai  China.College of Construction Engineering  Jilin University  Changchun  China 《东北亚地学研究》2008,11(1):37-41

By using fluent fluid engineer emulator software to simulate negative pressure formed inside the injector added in the reverse-circulation sampling drilling bit, at six angles of 15, 30, 45, 60, 75 and 90 degrees. The pressure distributing nephogram and the corresponding numerical value gotten compared with the experiment data received by an injector with 6 angles designed by emulation the conclusion. It has been found that the two values are coincident essentially. The article shows that using emulator technology to design optimizely is credible and simple. The cost is low and the design cycle is short compared with the method through experience and test.  相似文献   

Environmental flow assessment in a lake-marsh system with reverse seasonal hydrological patterns     

Jinglan Qin  Xin-an Yin  Xintian Qiu  Hongrui Liu  Enze Zhang  Yuanyuan Sun 《水文研究》2021,35(5):e14224

Environmental flow (e-flow) assessment is essential for the ecological protection and restoration of lake-marsh systems. Previous studies on e-flow assessment for lake-marsh systems focused on lake-marsh systems with natural seasonal hydrological patterns (i.e., low water level in winter and high water level in summer). However, they have not considered lake-marsh systems with reverse seasonal hydrological patterns (i.e., high water level in winter and low water level in summer). The reverse seasonal hydrological patterns impose seriously negative impacts on waterbirds, because the hydrological patterns could lead to limited plant germination in spring and massive plant death in summer, leaving few plants available as food for waterbirds in winter, and could consequently reduce the sheltering and forageable areas for waterbirds. This study took Hongze Lake Wetland National Nature Reserve in China as the study area. Based on the habitat requirements of waterbirds, the sheltering and forageable areas for waterbirds under different water-depth and aquatic plant distribution scenarios were calculated. By exploring the impacts of reverse seasonal hydrological processes on waterbird habitats, we determined the necessary e-flows for lake-marsh systems with reverse seasonal hydrological patterns to meet the needs of waterbird habitat. The results showed that the water level of Hongze Lake should be controlled to 13.0–13.1 m in March, 12.5–12.6 m in July, and 12.9–13.0 m in October, which can meet the needs of waterbirds for both shelter and foraging.  相似文献   

循环荷载作用下岩石劈裂结构面剪切力学特性演化与影响因素研究     

尹敬涵  崔臻  盛谦  陈健  张茂础 《岩土力学》2023,44(1):109-118

基于现有结构面剪切力学特性研究中对简单几何形态结构面研究多,天然形态结构面研究少,力学性质演化研究多,几何形态演化研究少的研究现状,通过巴西劈裂试验制备近天然形态岩石结构面,并采用模拟材料批量复制劈裂结构面试样的方法,开展循环荷载作用下岩石劈裂结构面的剪切力学特性演化规律与影响因素研究,分析法向应力、循环剪切次数、岩壁强度以及结构面粗糙度对循环剪切作用下岩体结构面力学特性和形貌特征的影响。最终通过在黏着摩擦理论-Barton经验公式中引入与循环剪切次数Nd有关的负指数假定劣化参数,提出了岩体结构面循环剪切强度公式。研究结果表明：法向应力、岩壁强度、结构面粗糙度越大,结构面的最大剪应力越大;法向应力、循环剪切次数、结构面粗糙度越大,岩壁强度越小,则归一化粗糙度参数越小。提出的循环剪切强度公式较好地验证了试验结果,可为工程安全设计提供理论参考。  相似文献   

笏山矿难应急救援钻孔施工技术          下载免费PDF全文

杜兵建  周兢  肖明国  孙红波  李红叶 《探矿工程》2021,48(S1):195-199

2021年笏山矿难钻孔救援是我国钻孔救援成功的典型案例。由于地层坚硬且裂隙发育,导致钻孔易偏斜且易发生卡钻事故,针对这一特殊情况采用潜孔锤空气泡沫钻进及螺杆马达纠偏等钻进工艺,成功完成了小口径生命保障孔钻探救援任务,同时本文也对生命保障孔、排水孔和大口径救生孔钻探救援技术进行了总结,对今后开展钻孔救援工作提出有待改进的问题和建议。  相似文献   

浅析《G PS 测量原理与应用》的“逆向思维”教学     

常亮  朱卫东  冯贵平 《全球定位系统》2015,(3):91-93

讨论了近年来在《G PS测量原理与应用》课程教学中对“逆向思维”教学方法的初步认识,列举了几个“逆向思维”教学实例,总结了课程教学中存在的一些问题,并提出了今后的改进方法。  相似文献   

地震层析技术在确定隐伏断层中的应用     

李忠生 《地球科学与环境学报》1999,(Z1)

本文给出了ＣＴ 计算中较常用的ＡＲＴ、ＳＩＲＴ 和ＬＳＱＲ 三种算法，用ＬＳＱＲ 算法对取自于断层的实际资料进行了层析反演，其结果是，断层两侧介质速度差异明显，比较准确地确定了断层的位置，结果比较理想。最后，将层析勘探与折射波勘探进行了对比，提出了将两种方法进行联合反演的思路  相似文献   

Calculation of flow distribution in air reverse circulation bit interior fluid field by simplifying air flow model     

Shuqing HAO  Hongwei HUANG  Kun YIN. Department of Geotechnical Engineering  Tongji University  Shanghai  China. College of Construction Engineering  Jilin University  Changchun  China 《东北亚地学研究》2007,10(2):190-195

By simplifying the characters in the air reverse circulation bit interior fluid field, the authors used air dynamics and fluid mechanics to calculate the air distribution in the bit and obtained an equation of flow distribution with a unique resolution. This study will provide help for making certain the bit parameters of the bit structure effectively and study the air reverse circulation bit interior fluid field character deeply.  相似文献   

Calculation of flow distribution in air reverse circulation bit interior fluid field by simplifying air flow model     

Shuqing HAO  Hongwei HUANG  Kun YIN 《世界地质(英文版)》2007,10(2)

By simplifying the characters in the air reverse circulation bit interior fluid field, the authors used air dynamics and fluid mechanics to calculate the air distribution in the bit and obtained an equation of flow distribution with a unique resolution. This study will provide help for making certain the bit parameters of the bit structure effectively and study the air reverse circulation bit interior fluid field character deeply.  相似文献