简柱体新型快捷算法及应用简介     

曹玉聘  陈战杰 《地质与勘探》1999,35(5):47-49

将各类简柱体（含拟柱体）的内插面积和体积计算通式表示为一个简单的二次三项式及其定积分形式,实现了一式多用和有关的直接复合运算,可使常规的复杂定积分近似计算转化为简单的精确计算。  相似文献   

微型钢桩在基础托换中的应用     

游欣频 《地质与勘探》1999,35(5):63-64,F003

介绍广州二沙岛消防站基础托换的方案选择,在地下室内克服地下水承压性进行托换的施工工艺,堵水防潮的处理方法。  相似文献   

天文大地网与空间网联合平差中用共轭梯度法解算高阶法方程的某些策略   总被引：4，自引：1，他引：3  

段五杏  袁学伟 《测绘学报》1999,28(3):205-208

本文研究了用共轭梯度法解算天文大地网与空间网联合平差中２０万阶法方程的有关问题,提出了“系数调整策略”和“平差与求逆既分又合的策略”。利用的天文大地网（４７０５７点）和空间网（４７６点）在ＰＩＩ／２３３微机上解算１４．１万阶方程组共迭代４９９３次,花费机时２８分４７秒,与未进行系数调整相比,功效提高４０多倍。  相似文献   

四川冕宁冶勒变质火山沉积岩系中微古植物的发现及意义     

陈玉禄  邓强 《地质通报》1999,(1):2

位于扬子地台西缘康滇地轴中段的冶勒变质杂岩体中分布的变质火山沉积岩系,首次发现微古植物化石,计有１１个属３６个种,时代确定为中新元古代蓟县系—青白口系,为岩系的划分及归属提供了依据,证实有褶皱基底的存在。  相似文献   

中国对虾复合疫苗的初步研究   总被引：14，自引：0，他引：14  

丁燏  王雷  李光友 《海洋与湖沼》1999,30(4):355-361

于１９９６年１１月－１９９７年５月,运用差异离心,蔗糖梯度离心、柱层析等方法从发病中国对虾分离出杆状病毒并纯化;分别用冷乙酸处理法、十二烷基硫酸钠－苯酚法提取纯化该病毒的结构蛋白与核酸、λＤＮＡ;分别用十二烷基硫酸钠煮沸法、三氯乙酸法纯化孤菌的肽菊聚糖和鸡卵粘蛋白;配制出小牛血清白蛋白、蜗牛凝集素两溶液。然后从超氧化物歧化酶（ＳＯＤ）活力和溶菌活力两种免疫指标分析灭活病毒和以上提取、纯化的７种大分  相似文献   

Seasonal Variation in the Phytoplanktonic Community,Seston and Environmental Variables During a 2-Year Period and Oyster Growth at Two Mariculture Sites,Southern Chile     

Jorge E. Toro  Pamela I. Paredes  Darío J. Villagra  Carolina M. Senn 《Marine Ecology》1999,20(1):63-89

Phytoplankton and its relationships with physical and chemical variables were analysed over a 2-year period in Hueihue and Linao Bays (southern Chile). Samples were collected on a monthly basis from May 1991 to May 1993. The growth rate of a single stock of hatchery-produced oysters (Ostrea chilensis) distributed between these two bays was also monitored monthly. The growth rate of oysters maintained at Linao Bay (site associated with a fish farm) was significantly higher, at every depth, compared with the oysters maintained at Hueihue Bay. Temperature and salinity values and their annual fluctuations were similar at both locations, presenting higher variations at the surface (1 m) due to the influence of air temperature and local precipitation than at depth. However, significant differences in phytoplankton abundance and composition were found between the two locations. The phytoplankton community was characterized by high biomass values during spring and summer, the dominance of diatoms and an inverse relationship between temperature and species diversity. However, phytoplankton cell abundance, biovolume and chlorophyll a concentration were significantly higher at Linao at every depth sampled. Cell abundance ranged between 4.49 × 10⁴ and 7.45 × 10⁶ cells · l^?1 in Hueihue and between 6.48 × 10⁴ and 8.71 × 10⁶ cells ·1^?1 in Linao. The influence of temperature on chlorophyll a concentration was significant except at 8 m at both locations. The instantaneous oyster growth rate was found to be positively correlated with temperature, chlorophyll a concentration and particulate organic matter at both locations. A significant negative relationship between oyster growth and amount of particulate inorganic matter was found; this confirms the important role played by seston composition in oyster growth. The demonstration of variation in oyster growth rate associated with differences in food availability between the two locations provides insight into the ecological role played by fish farms in southern Chile. The results suggest a strong link between food availability and oyster growth.  相似文献   

Application of conditional geostatistical simulation to calculate the probability of occurrence of earthquakes belonging to a seismic series     

Federico Torcal  Antonio M. Posadas  Mario Chica  & Inmaculada Serrano 《Geophysical Journal International》1999,139(3):703-725

Geostatistics offers various techniques of estimation and simulation that have been satisfactorily applied in solving geological problems. In this sense, conditional geostatistical simulation is applied to calculate the probability of occurrence of an earthquake with a lower than or equal magnitude to one determined during a seismic series. It is possible to calculate the energy of the next most probable earthquake from a specific time, given knowledge of the structure existing among earthquakes occurring prior to a specific moment.  相似文献   

云南省重点湖库水体透明度和叶绿素a建议控制指标的探讨   总被引：10，自引：0，他引：10  

王立前  张榆霞 《湖泊科学》2006,18(1):86-90

为了控制云南省高原湖泊的富营养化,切实改善湖库的水环境质量,本文在通过调查统计云南省辖区内的典型湖库和国内外相关指标分析评价研究的基础上,提出了云南省重点保护湖库水中透明度、叶绿素a环境控制指标的标准限值:Ⅰ类5．0m、Ⅱ类2．5m、Ⅲ类为1．0m、Ⅳ类和Ⅴ类均为0．5m;叶绿素a为:Ⅰ类2μg／L、Ⅱ类10μg/L、Ⅲ类20μg/L、Ⅳ类40μg／L、Ⅴ类60μg／L.这两项控制指标能与国家标准有较好的衔接,可作为云南省执行GB3838-2002《地面水环境质量标准》时重点湖库的地方补充标准限值．  相似文献   

西湖叶绿素a周年动态变化及藻类增长潜力试验   总被引：21，自引：2，他引：19  

吴洁  钱天鸣  虞左明 《湖泊科学》2001,13(2):143-148

通过1999年1－12月对杭州西湖主要湖区叶绿素a含量及水量理化指标的逐月测定,分析了西湖主要湖区叶绿素a含量周年动态变经特征及各种环境生态因子对叶绿素a的影响,并对湖水进行了藻类增长潜力试验,研究结果表明,西湖主要湖区叶绿素a含量总体保持在同一水平,年变化在41．16－191．26mg/m^3之间,年均值为为99．98mg/m^3。叶绿素a妗有明显的季节变化特征,夏季和初秋为高峰、冬季最低,水体总磷浓度与叶绿素a年周期动态变化一致,叶绿素a含量的季节变化与水温变化呈显著正相关,西湖为典型的蓝藻型湖,叫氮年均值为2．08mg/L总磷年均值为0．121mg/L,N:P大于17,水体中磷对藻类增长的促进作用比氮更加明显。  相似文献   

太湖螺类的实验生态学研究——以环棱螺为例   总被引：3，自引：0，他引：3  

白秀玲  谷孝鸿  张钰 《湖泊科学》2006,18(6):649-654

通过室内实验探讨环棱螺营养盐释放的影响因子及环棱螺对水体悬浮物、透明度及浮游植物的影响等生态特性．结果表明:温度及进食状况对环棱螺的营养盐释放均有显著影响．15℃时,环棱螺氨氮的释放速率约为55．60±4．95μg／(g·d),磷酸根的释放速率约为2．073±0．120μg／(g·d);而25℃时,环棱螺磷酸根的释放速率是2 819±0．075μg／(g·d),表明在一定温度范围内,环棱螺营养盐的释放速率随温度升高而增加,且进食状态下环棱螺的营养盐释放速率高于饥饿状态．此外,环棱螺虽在短时间内可提高水体的透明度,但其释放的营养盐可引起局部水体溶解态氮磷含量的增加,在没有其它初级生产者争夺营养盐和光照等资源的情况下,水体中藻类的再生速率会加快,环棱螺难以对藻类的增殖起到抑制作用．南此建议在利用螺类进行生态调控的过程中,必须与沉水植物的恢复紧密结合,通过合理的空间搭配,实现水生态系统的恢复与健康发展．  相似文献