前兆管理系统数据库冷备份及恢复方法实现   总被引：1，自引：1，他引：0  

陈传华  曲保安  朱荣  林秀娜  吕春帅 《地震地磁观测与研究》2010,31(4):135-139

前兆管理系统数据库备份是保证前兆台网正常运行一项重要内容,本文详细介绍前兆Oracle数据库的冷备份方法,备份包的保存方式,移动硬盘的加载,备份脚本的功能及使用方法。  相似文献   

加标回收试验及质控图在实验室内控中的应用     

曹宇峰 《海洋技术学报》2008,27(3)

介绍采用加标回收试验和绘制回收率质控图进行质量控制的方法,结合海洋环境监测工作说明其在实验室内控中应用.  相似文献   

大珠母贝术后处理研究   总被引：1，自引：0，他引：1  

罗振鸿  曹家录  齐常元  欧阳育斌  黄道华  林青 《广东海洋大学学报》1997,(1)

用蚌复康（A组）、鱼蚌康复剂（B组）和盐酸普鲁卡因（C组）对人工插核后的大珠母贝进行术后处理，并经室内人工管养度过休养期。结果显示：术后成活率C组为70．0％，A组为60．0％，对照组为364％；留核率A组为66.7％，C组为57.1％，对照组为50.0％。表明蚌复康与盐酸普鲁卡因可以明显提高植核母贝的术后成活率和留核率；另外，休养期在室内度过也有助于提高留核率。  相似文献   

工厂化培育海水珍珠的研究     

邓陈茂  陈明耀  林养  梁飞龙  李裕功  黄腾超 《广东海洋大学学报》1992,(2)

在海区中养殖珍珠常受到台风、淡水、低温等自然灾害的影响和敌害生物的侵袭,使育珠贝大量死亡。在岸上水槽系统,在人为控制的条件下养殖海水珍珠——工厂化育珠,则可避免上述的影响。本文介绍工厂化培育海水珍珠的试验设施、育珠试验、试验结果与评价。  相似文献   

锰银氧化矿选冶工艺的研究现状及进展   总被引：1，自引：0，他引：1  

李维天 《南方国土资源》2001,14(3):63-66

锰银氧化矿在中国是一种重要的矿床类型 ,但在目前经济技术条件下仍属于难选冶和无商业价值的矿石类型。文章对国内外锰银氧化矿选冶技术的研究现状和进展进行了比较全面的评述  相似文献   

积分法恢复地球重力场模拟分析     

肖云夏哲仁  童玉平 《测绘科学与工程》2005,25(4):11-13

本文用积分法模拟恢复了地球重力场，同真实重力场进行比较，分析了结果。结果表明，本文使用模型及程序算法正确，可以用于恢复重力场，精度在10^-12的量级上，对应的大地水准面阶误差小于0．2mm，大地水准面累积误差30阶处小于0．5mm。  相似文献   

黄河口粉土强度丧失与恢复过程现场振动试验研究   总被引：4，自引：7，他引：4  

贾永刚  史文君  单红仙  许国辉  刘红军  郑建国 《岩土力学》2005,26(3):351-358

在黄河口潮坪上选择典型研究区,进行了模拟波浪荷载的现场振动试验,利用轻型静力触探仪测记振动前、振动刚刚结束以及静置一段时间后土体贯入阻力的强度值,研究了海床土强度的丧失、恢复过程及影响因素。研究结果发现:模拟波浪荷载振动导致土体强度丧失发生在海底面下一定深度范围内,强度丧失量和恢复量沿深度呈抛物线型变化。振动后,土体表面排出的水和细粒物质环绕振动点周围形成一系列微型“泥火山”。振动导致土强度最大恢复量值与强度最大丧失量值出现在同一深度处;振动结束 2 h 后,土体强度超过振动前原状土体强度,振动使土体强度丧失与恢复受土体曾经历的水动力作用强弱、振动前土体的原始强度、振动荷载的循环次数、振动能量大小、土体的深度、静置的时间等因素的影响显著。黄河口海床土体强度独特变化规律的成因机理有待进一步研究。  相似文献   

Accuracy Analysis of Gravity Model Based on Fictitious Compress Recovery Approach     

SHEN Wenbin TAO Benzao 《地球空间信息科学学报》2007,10(3):157-162

The potential field determined based on the fictitious compress recovery approach is influenced by the errors contained in the boundary (the Earth’s surface or the surface corresponding to the satellite altitude) values. Given the boundary value with definite accuracy, the accuracy of the field determined based on the fictitious compress recovery approach is estimated, and it is theoretically shown that the determined field has the same accuracy level as the given boundary value.  相似文献   

Confronting hysteresis: Wood based river rehabilitation in highly altered riverine landscapes of south-eastern Australia   总被引：1，自引：1，他引：1  

Andrew P. Brooks  Timothy Howell  Tim B. Abbe  Angela H. Arthington 《Geomorphology》2006,79(3-4):395

This study evaluates an experiment in river rehabilitation which uses large wood to stimulate and emulate natural system processes in an effort to reverse channel degradation, excess sediment transport and habitat simplification that has resulted from two centuries of human induced disturbances, particularly desnagging. The experiment involved the reintroduction of 436 logs (350 t) within 20 engineered log jams (ELJs) over an 1100 m reach. Commencing in 1999, the experiment was set up as a standard BACI design, with a control reach 3 km upstream. In the 5 years since implementing the rehabilitation strategy, the study reach has experienced five floods greater than the mean annual, and a further five events capable of mobilising the gravel bed. Five surveys of channel terrain have been completed since treatment implementation, and the changes to net sediment storage and morphologic diversity assessed in comparison to the control reach. Seven surveys of the fish population in the reach have also been undertaken during the project to measure the ecological response to the introduced wood. The experiment has demonstrated the effectiveness of ELJ technology in achieving engineering and geomorphic goals. To date, the treatment has halted further degradation of the river and increased sediment storage, with the test reach now storing, on average, 40 m³/1000 m² more sediment than in the control. These values, it would appear, represent a new reach-scale dynamic equilibrium storage level over decadal timescales. Additional sediment storage amounts to 3.5 m³/m³ of wood added. At the reach scale this additional storage represents a reduction of just 2% or less of the post-European expansion in channel capacity, suggesting far greater efforts are required than those employed here to reverse the cumulative effects of 180 years of channel erosion and simplification.Pool and bar area in the test reach increased by around 5% and 3.5%, respectively, while the corresponding values in the control were around 1.5% and 1%, respectively. Two indices of morphologic diversity were measured for each bed survey: the standard deviation of 3D residuals of change compared with the baseline survey (SD_iΔ3D); and the standard deviation of thalweg residuals from the line of best fit (SD_iTR). The SD_iΔ3D index shows both reaches increased in complexity through the study with the treatment increasing more than the control (0.37 and 0.29, respectively). The SD_iTR index does not detect clear changes because of the low signal to noise ratio, however, it does suggest the test reach was more complex than the control at the outset. The observed increase in fish abundance after the first 12 months of monitoring, reported previously, is now far less distinct 4 years on — a pattern seemingly reflecting the relatively minor increases in critical pool habitat and habitat diversity over the same period. Although no significant differences were detectable in fish species richness or total abundance from the reach aggregate data after 4 years, analysis of individual structures show them to be high quality habitat for native fish compared to the rest of the reach and the upstream control.These results highlight the challenges river managers face in achieving measurable improvements in the health of aquatic ecosystems in highly altered rivers. Managers must confront hysteresis in a biophysical and institutional sense when attempting to reverse the degradation of rivers. The scale of treatment implemented in this experiment was at the upper end of the spectrum of rehabilitation efforts currently being undertaken in Australia, suggesting that far greater resources and longer timescales are required to achieve the levels of improvement in the diversity of stream habitat expected by the community. The study also highlights problems with the strategy of attempting to meet multiple objectives within a reach scale rehabilitation project. While this treatment successfully met some geomorphic study objectives, maximising the benefits for fish habitat would require a strategy focused primarily on the creation of complex woody habitat within deeper pools, particularly pools immediately below riffles.  相似文献   

Wavelet Modeling of Regional and Temporal Variations of the Earth’s Gravitational Potential Observed by GRACE   总被引：1，自引：0，他引：1  

M. J. Fengler  W. Freeden  A. Kohlhaas  V. Michel  T. Peters 《Journal of Geodesy》2007,81(1):5-15

This work is dedicated to the wavelet modeling of regional and temporal variations of the Earth’s gravitational potential observed by the GRACE (gravity recovery and climate experiment) satellite mission. In the first part, all required mathematical tools and methods involving spherical wavelets are provided. Then, we apply our method to monthly GRACE gravity fields. A strong seasonal signal can be identified which is restricted to areas where large-scale redistributions of continental water mass are expected. This assumption is analyzed and verified by comparing the time-series of regionally obtained wavelet coefficients of the gravitational signal originating from hydrology models and the gravitational potential observed by GRACE. The results are in good agreement with previous studies and illustrate that wavelets are an appropriate tool to investigate regional effects in the Earth’s gravitational field. Electronic Supplementary Material Supplementary material is available for this article at  相似文献