月面反射器观测位置的高精度预报     

白金明  聂昭明  金文敬 《天文研究与技术》1993,(3)

本文利用JPL的DE303/LE303星历表建立了一套预报月面反射器相对于地面观测站位置的计算机程序,并对预报精度作了估计,结果表明预报精度达到毫角秒级。  相似文献   

断层相互作用的初步讨论     

姚兰予  聂永安  赵根模 《大地测量与地球动力学》1996,(4)

给出了半无限介质中任意倾角的多个已发震矩形断层对邻近任意倾角的潜在活断层共同作用的合应力的解析表达式，从而可以计算震后合应力的调整值，为判断潜在活断层的稳定性提供依据。合应力Ｓｒ中既包括了作用在断层面上的正应力，又包括了断层面上的剪应力，它比单独用一个应力描述应力场更有效。最后，用１９７３年２月６日炉霍地震后的实际震例说明了地震断层错动对周围孕震区的触发作用  相似文献   

滕县煤田张汪勘探区找煤可行性研究     

陶莅宁  王士路  聂明 《中国煤炭地质》2008,(7):16-18

通过对滕东预测区地层、构造、岩浆岩等地质条件的分析,论证了张汪勘探区3煤层赋存的可能性。根据3下煤层顶板砂岩分布特征,排除了同生冲刷作用对3下煤层的影响;区域构造对3煤层埋藏起到保护作用;根据岩浆岩在邻区的分布,分析了岩浆侵入对3煤层的影响;利用南沙河勘探区、田陈井田、许楼井田钻探资料,推测了本区3煤层厚度,估算煤层埋深在-1200m以浅、-1200～-1500m的资源量合计15950万t,有单独建井的前景,建议进一步开展工作,为煤炭资源的开发提供准确的地质资料。  相似文献   

Application of multivariate statistical approach to identify heavy metal sources in sediment and waters: a case study in Yangzhong,China   总被引：4，自引：0，他引：4  

Jian Zhou  Dongsheng Ma  Jiayong Pan  Wenming Nie  Kai Wu 《Environmental Geology》2008,54(2):373-380

Multivariate statistical approach is used to identify the sources of heavy metals (Bi, Cd, Co, Cr, Mn, Pb, U, V, and Zn) in surface water and freshly deposited riverine sediment samples in Yangzhong city, China. The metal concentration data for the water and sediment samples are reported in terms of basic statistical parameters and metal-to-metal correlations. In both surface water and sediment samples, significant correlations are observed between some metals. Principal component analysis and cluster analysis distinguishes factors of lithogenic and anthropogenic origin. Bismuth, Cd, Co, and Pb (Co only for water samples) contents are controlled by the regional lithogenic high background factor; Co, Mn, U, and V (Co only for sediment samples) are interpreted to be mainly inherited from soil parent materials, while Cr, Zn, and Mn in the two kinds of samples are recognized as the tracer of industrial pollution. Obvious similarity between factor loadings of the two kinds of samples is observed, evidencing that metal variability in the two kinds of samples is controlled by the same sources. Statistical analysis agrees with discussion based on background value and field survey of point-source pollutant affected sediment, making this statistical discussion more convincing.  相似文献   

Implication of adaptive smoothness constraint and Helmert variance component estimation in seismic slip inversion     

Qingbiao Fan  Caijun Xu  Lei Yi  Yang Liu  Yangmao Wen  Zhi Yin 《Journal of Geodesy》2017,91(10):1163-1177

When ill-posed problems are inverted, the regularization process is equivalent to adding constraint equations or prior information from a Bayesian perspective. The veracity of the constraints (or the regularization matrix R) significantly affects the solution, and a smoothness constraint is usually added in seismic slip inversions. In this paper, an adaptive smoothness constraint (ASC) based on the classic Laplacian smoothness constraint (LSC) is proposed. The ASC not only improves the smoothness constraint, but also helps constrain the slip direction. A series of experiments are conducted in which different magnitudes of noise are imposed and different densities of observation are assumed, and the results indicated that the ASC was superior to the LSC. Using the proposed ASC, the Helmert variance component estimation method is highlighted as the best for selecting the regularization parameter compared with other methods, such as generalized cross-validation or the mean squared error criterion method. The ASC may also benefit other ill-posed problems in which a smoothness constraint is required.  相似文献   

利用时序InSAR技术分析北京及河北廊坊地面沉降     

周旭  许才军  温扬茂 《测绘科学》2017,42(7)

利用带大气估计模型的时序InSAR方法对24幅覆盖北京及河北廊坊的Envisat-ASAR影像数据进行了时序分析,获取了该地区2007年4月—2010年9月的地面沉降速率及均方差。发现了以北京朝阳区和通州区交界处为中心和以河北廊坊城区为中心的两个沉降区域,中心区平均沉降速率分别为35mm/a与22mm/a。研究区域形变速率均方差1.5mm/a。研究结果表明:利用时序InSAR技术进行城市地表沉降监测具有较好的精度及稳定性;产生该沉降的可能原因为地下水的开采、城市基础建设的发展及工业用地量、人为活动的增加。  相似文献   

Vertical Migration of Petroleum via Faults in Zhu Ⅲ Subbasin, Pearl River Mouth Basin, South China Sea     

Nie Fengjun East China Geological Institute  Linchuan  Institute of Geology  China Seismological Bureau  Beijing Li Sitian Wang Hua Xie Xinong Faculty of Earth Resources  China University of Geosciences  Wuhan Wu Keqiang Chin 《中国地质大学学报(英文版)》2001,12(2)

ＩＮＴＲＯＤＵＣＴＩＯＮＤｏｗ (1994)ｓｔａｔｅｄ ,“Ｉｆｗｅｋｎｅｗｗｈｅｒｅｔｈｅｏｉｌｓｃａｍｅｆｒｏｍａｎｄｈｏｗｔｈｅｙｍｉｇｒａｔｅｄ ,ｗｅｃｏｕｌｄｂｅｔｔｅｒｐｒｅｄｉｃｔｗｈｅｒｅｔｈｅｙｗｏｕｌｄｂｅｆｏｕｎｄｉｎｔｈｅｆｕｔｕｒｅ .”Ｔｈｉｓｓｔａｔｅｍｅｎｔｈｉｇｈｌｉｇｈｔｓｔｗｏｉｍｐｏｒｔａｎｔａｓｐｅｃｔｓ,ｔｈｅｓｏｕｒｃｅｏｆｏｉｌｓａｎｄｔｈｅｍｉｇｒａｔｉｏｎｏｆｏｉｌｓ.Ｓｅｃｏｎｄａｒｙｍｉｇｒａｔｉｏｎｉｓｔｈｅｍｏｖｅｍｅｎｔｏｆｐｅｔｒｏｌｅｕｍｂ…  相似文献   

赣皖边境地区青白口纪地层划分与对比   总被引：2，自引：0，他引：2  

廖洪鑫  聂剑华 《江西地质科技》1997,24(3):111-117

1:5万区调填图中系统调研了江西省内都昌县马涧桥、波阳县燕窝一带新发现的青白口纪地层岩石组合与层序、岩相特征,获得部分微古植物化石及847±38Ma的同位素测年数据,重新厘定并新建马涧桥组,据其特征认为可与毗邻的皖南青白口纪地层对比。四堡运动后,本区与皖南都曾经历过裂陷时期,具有相同的构造背景。  相似文献   

宣龙地区中元古代铁岩建造成因探讨   总被引：1，自引：0，他引：1  

聂逢君 《华东地质学院学报》1997,20(1):11-17

“宣龙岩”铁岩建造是中元古代早期形成的肾状，鲕状铁岩建造，它属于地球上较早的铁岩建造。铁的物质来源是大陆风化壳上的铁质，以氢氧化铁胶体形式搬运至内陆海中，肾状铁岩在生物和胶体化学共同作用下形成于滩后低能带；鲕状铁岩在物理搅动和胶体化学联合作用下形成于高能浅滩。  相似文献   

Effects of dietary carbohydrate-to-lipid ratio on the growth performance and feed utilization of juvenile turbot (<Emphasis Type="Italic">Scophthalmus maximus</Emphasis>)     

MIAO Shuyan  NIE Qin  MIAO Huijun  ZHANG Wenbing  MAI Kangsen 《中国海洋大学学报(英文版)》2016,15(4):660-666

A 9-week feeding trial was conducted to investigate the effects of dietary carbohydrate to lipid ratio(CHO:LIP) on the growth performance and feed utilization of juvenile turbot Scophthalmus maximus(initial body weight 8.75 g ± 0.04 g). Four isonitrogenous and isoenergetic low protein level(39%) diets were formulated with increasing ratios of dietary carbohydrate to lipid(2:18, 6:18, 18:12 and 28:6). A high protein level(50%) diet with the 2:12 ratio of carbohydrate to lipid was used as the control. Results showed that the survival rate, contents of moisture, crude protein and ash in muscle were not significantly affected by dietary treatments. With the dietary CHO:LIP ratio increased from 2:18 to 18:12, weight gain rate significantly increased(P < 0.05). Higher dietary CHO:LIP ratio(28:6) resulted in the significantly decreased weight gain rate(P < 0.05). Meanwhile, this treatment also resulted in the highest daily feed intake and liver glycogen content, as well as the lowest feed efficiency(P < 0.05). Muscle glycogen content in fish fed the diet with 2:12 or 2:18 CHO:LIP ratio was significantly lower than those fed with the other three diets(P < 0.05). The present results confirmed that the juvenile turbot can utilize carbohydrate. Furthermore, the appropriate ratio of dietary carbohydrate to lipid was important to the growth and feed utilization of turbot. The proper CHO:LIP ratio based on the growth performance in the present study was determined to be 18:12 when the dietary protein level was 39%.  相似文献