湘中南红土型金矿野外半工业堆浸试验     

陈洋罗  吴雪明 《华南地质与矿产》2003,(3):66-69

为了开发利用湘中南红土型及部分卡林型金矿，对祁东县三德堂金矿点进行野外半工业氰化堆浸试验。试验结果表明：含泥小于25％的红土型金矿氰化浸出效果较好，致密的硅化较强的卡林型金矿氰化浸出效果较差，粒径小于1cm的氧化矿石易于氰化浸出，最佳浸出时间是夏秋季节，为30～40天，本次氰化浸出率为89．5％，利润率为14．95％。湘中南红土型及部分卡林型金矿采用氰化堆浸法，技术上可行，经济上合算。  相似文献   

Statistics of breaking waves and its applications to estimation of air-sea fluxes (Ⅰ)——Theoretical models   总被引：1，自引：0，他引：1  

ZHANG Shuwen & YUAN YeliKey Laboratory of Marine Science  Numerical Modeling  First Institute of Oceanography  State Oceanic Administration  Qingdao  ChinaCorrespondence should be addressed to Zhang Shuwen 《中国科学D辑(英文版)》2004,(1)

Wave breaking statistics, such as the whitecap coverage and average volume of broken seawater, are evaluated in terms of wave parameters by use of wave breaking model (Yuan et al., 1988) taking the fifth order Stokes's wave as the analog of the original wave field. Based on the observed fact that breaking waves play an important role in the exchange of mass, momentum and energy between the atmosphere and the ocean, the influence of wave breaking on air-sea fluxes of heat and moisture is investigated. Theoretical expressions of bubble-volume flux and sea spray spectrum at the sea surface and models for bubble-induced and spray droplet-induced heat and moisture fluxes are established. This work can be taken as the basis for further understanding the mechanism of air-sea coupling and parameterization models.  相似文献   

Statistics of breaking waves and its applications to estimation of air-sea fluxes (I)--Theoretical models     

ZHANG Shuwen  Yuan Yeli 《中国科学D辑(英文版)》2004,47(1)

Wave breaking statistics, such as the whitecap coverage and average volume of broken seawater, are evaluated in terms of wave parameters by use of wave breaking model (Yuan et al., 1988) taking the fifth order Stokes's wave as the analog of the original wave field. Based on the observed fact that breaking waves play an important role in the exchange of mass, momentum and energy between the atmosphere and the ocean, the influence of wave breaking on air-sea fluxes of heat and moisture is investigated. Theoretical expressions of bubble-volume flux and sea spray spectrum at the sea surface and models for bubble-induced and spray droplet-induced heat and moisture fluxes are established. This work can be taken as the basis for further understanding the mechanism of air-sea coupling and parameterization models.  相似文献   

海气界面液滴粒径分布测量装置的原理设计和试验     

王岩峰  曹瑞雪  张杰  孙培光  张书文  丁永耀 《海洋技术学报》2006,25(1):24-27

海气界面液滴粒径分布的测量对于海气界面通量的准确估算具有重要的意义。在分析多种测量技术的基础上,结合海上测量环境,设计了光学测量装置,给出了利用多环散射光信号计算液滴粒径分布的方法。实验分析表明,该装置可用于进行透明喷雾状的液滴粒径测量。  相似文献   

泡沫钻进流体循环用消泡器设计与数值模拟分析          下载免费PDF全文

王劲松  蒋建良  潘永坚  蔡国成  李高山 《探矿工程》2020,47(5):53-59

高效、经济、环保的消泡技术是泡沫钻进流体循环利用的基础。根据气体引射器原理,设计了一种新型旋内喷式机械消泡装置,以压缩空气为动力介质,联合真空负压、冲击剪切、充气饱和及减速增压扩散4种作用方式快速消泡,实现泡沫流体的循环利用。利用计算流体动力学软件FLUENT对消泡器内部速度和压力流场进行了数值模拟分析,结果表明：旋内喷式消泡器内部产生两个相邻重叠的真空负压区域,能够对外界流体产生巨大的抽吸力,抽吸量是入口压缩空气质量流的1.6倍左右;当入口压缩空气的质量流为0.1 kg/s时,消泡器中心最大负压值达到了21 kPa;在交汇式喷射孔的多股射流交汇碰撞点附近,由于速度的提升,形成了一个更大的负压区域,对消泡产生积极作用。  相似文献   

高压旋喷注浆法加固已竣工桥涵地基的应用     

石广余  韩寿乔  刘锋 《地质与勘探》1999,35(6):77-79

高压旋喷注浆法加固已竣工桥涵地基具有针对性和技术优势;同时具有对桥涵损伤小、费用低、进度快、较小影响道路行车,加固质量后效果可靠等优点。该技术已在太旧高速公路上得到了成功应用  相似文献   

基于正交试验原理的锚喷参数设计系统及其应用   总被引：5，自引：2，他引：3  

朱万成  唐春安  黄明利 《岩土力学》1999,20(2):2

基于正交试验原理,把正交设计方法与地下工程有限元数值模拟有机地结合应用于锚喷支护参数的优化,形成基于正交试验原理的洞室锚喷参数设计系统的基本思路。并以此为基础编制了相应的程序,应用于地下工程锚喷支护设计。  相似文献   

Effects of surface waves and sea spray on air–sea fluxes during the passage of Typhoon Hagupit   总被引：3，自引：1，他引：2  

何海伦  吴巧燕  陈大可  孙佳  梁楚进  金魏芳  徐尧 《海洋学报(英文版)》2018,37(5):1-7

Air–sea exchange plays a vital role in the development and maintenance of tropical cyclones(TCs). Although studies have suggested the dependence of air–sea fluxes on surface waves and sea spray, how these processes modify those fluxes under TC conditions have not been sufficiently investigated based on in-situ observations.Using continuous meteorological and surface wave data from a moored buoy in the northern South China Sea,this study examines the effects of surface waves and sea spray on air–sea fluxes during the passage of Typhoon Hagupit. The mooring was within about 40 km of the center of Hagupit. Surface waves could increase momentum flux to the ocean by about 15%, and sea spray enhanced both sensible and latent heat fluxes to the atmosphere,causing Hagupit to absorb 500 W/m~2 more heat flux from the ocean. These results have powerful implications for understanding TC–ocean interaction and improving TC intensity forecasting.  相似文献   

NUMERICAL EXPERIMENTS ON THE IMPACTS OF SEA SPRAY ON TROPICAL CYCLONES     

郑静  费建芳  王元  黄小刚  李启明  吴宏毅 《热带气象学报(英文版)》2009,15(1):54-58

The latest version of sea spray flux parameterization scheme developed by Andreas is coupled with the PSU/NCAR model MM5 in this paper. A western Pacific tropical cyclone named Nabi in 2005 is simulated using this coupled air-sea spray modeling system to study the impacts of sea spray evaporation on the evolution of tropical cyclones. The results demonstrate that sea spray can lead to a significant increase of heat fluxes in the air-sea interface, especially the latent heat flux, the maximum of which can increase by up to about 35% - 80% The latent heat flux seems to be more important than the sensible heat flux for the evolution of tropical cyclones. Regardless of whether sea spray fluxes have been considered, the model can always simulate the track of Nabi well, which seems to indicate that sea spray has little impact on the movement of tropical cyclones. However, with sea spray fluxes taken into account in the model, the intensity of a simulated tropical cyclone can have significant increase. Due to the enhancement of water vapor and heat from the sea surface to the air caused by sea spray, the warm core structure is better-defined, the minimum sea level pressure decreases and the vertical speed is stronger around the eye in the experiments, which is propitious to the development and evolution of tropical cyclones.  相似文献   

我的海洋浪花飞溅区腐蚀情缘     

侯保荣 《海洋科学》2020,44(7):179-193

作者回顾了近50年的科研工作生涯，特别是对海洋浪花飞溅区构筑物腐蚀防护的研究，以及我国浪花飞溅区腐蚀防护的重要事件，总结了相关工程经验。同时，对浪花飞溅腐蚀防护的未来前景进行了展望。  相似文献