新疆那拉提山-哈尔克山北坡金矿集区远景分析

论述那拉提山-哈尔克山北坡地区的成矿地质背景及成矿特征,简述了中亚天山构造-成矿带金矿资源梗概并与区内进行了对比;从研究区的成矿地质条件、矿化特征和化探异常资料出发,分析了区内金矿的成矿远景,指出区内是新疆寻找穆龙套型金矿最有远景的地区之一,进而提出5个找矿远景区.     

等温大气压高方程在气压剖面高度计算中的应用

气象探测仪器获取空中气象数据时,需要确定气象数据对应的气压高度,以形成剖面测量数据.将等温大气压高方程应用于实际的气压剖面高度计算中,确定计算的边界条件并进行误差估算,并通过实际算例,验证了理论计算的有效性.     

一类快扩散方程解的消失及衰减估计

利用积分模估计的方法研究一维与二维情形中快扩散方程解的消失现象。研究过程中巧妙利用低维空间中的Sobolev嵌入不等式和Hlder不等式得出解发生消失的充分条件及其衰退估计。特别是,临界情形时解的消失行为依赖于拉普拉斯算子的第一特征值。     

协方差阵的二次型容许估计

该文研究协方差阵 Σ的二次型容许估计问题。设 y1,y2 ,… ,yn iid,n≥ 2 ,y1与 p维正态分布 N β,Σ有相同的前四阶矩。其中 β=β1,β2 ,… ,βp ′∈ RP与 Σ=σij p× p>0均未知。记y=△ (y1,y2 ,… ,yn)′。在损失函数 L(d,Σ) =tr(d- Σ) 2下给出 Σ的二次型估计在 D={ y′ Ay∶ A≥ 0 ,A∈ Rn× n}中容许的必要条件是 y′ Ay必须具有 a S2 + nb y-y-′的形式。并进而得出当 b=0时 a S2 作为Σ的容许估计的充要条件     

利用微波做短时强降水估计

本文主要是利用NOAA-16气象卫星的AMSU-B微波仪器(5个通道)所接收到的2002年8月6日03时(北京时)的图像做短时的强降水估计。通过对微波图像和红外云图以及6h降雨量的分析,我们可清楚的看到,利用AMSU-B的微波图像可较为准确分析出中小尺度微波图所在的位置,和在各层次的强弱以及该系统水汽含量的垂直结构等。另外,通过分析也可看出,利用微波图像做短时的强降水估计,除看微波图像外,还应利用红外云图分析云团生命史和各个阶段及其移向、移速等才可较为近似估计出强降水量的大小。     

Relationship between somatic growth and otolith growth: a case study of the ornate jobfish Pristipomoides argyrogrammicus from the coast of Réunion (SW Indian Ocean)

The ornate jobfish Pristipomoides argyrogrammicus Valenciennes 1832 occurs in the Indo-West Pacific Ocean, where it is harvested by small-scale coastal fisheries. Management of this species is hindered by lack of adequate biological data. We sampled a total of 113 individuals from the landings of local artisanal fishers on the island of Réunion (southwestern Indian Ocean), from March 2014 to March 2015. The relationships between two types of body length (total and standard length, cm) and total weight (g) were shown to be significant (p < 0.05). The length–weight relationship was described by a power function, with the scaling factor estimated to be 0.008 and the exponent 3.146. Age was determined using whole otoliths. The von Bertalanffy growth equation was estimated to be TL_t = 30.68(1 – e^?0.52(t)). Otolith morphometry variables (length, width and area) were significantly correlated with age estimates (p < 0.05). No significant difference in age estimates was observed between left and right otoliths used as predictors. Readings from observed age and the estimates from modelled age indicated relatively good agreement, suggesting the potential to use whole otoliths for age estimation.     

Comparing an estimate of seabirds at risk to a mortality estimate from the November 2004 Terra Nova FPSO oil spill

On 21 November 2004, about 1000 barrels of crude oil were accidentally released from the Terra Nova FPSO (floating production, storage and offloading) onto the Grand Banks, approximately 340 km east-southeast of St. John's, Newfoundland. We estimated the number of vulnerable seabirds (murres (Uria spp.) and dovekies (Alle alle)) at risk from this incident by multiplying observed densities of seabirds with the total area covered by the slick, estimated at 793 km(2). A mean density of 3.46 murres/km(2) and 1.07 dovekies/km(2) on the sea surface was recorded during vessel-based surveys on 28 and 29 November 2004, with a mean density of 6.90 murres/km(2) and 13.43 dovekies/km(2) combining those on the sea and in flight. We calculated a mean of 9858 murres and dovekies were at risk of being oiled, with estimates ranging from 3593 to 16,122 depending on what portion of birds in flight were assumed to be at risk. A mortality model based on spill volume was derived independently of the risk model, and estimated that 4688 (CI 95%: 1905-12,480) birds were killed during this incident. A low mortality estimate based strictly on spill volume would be expected for this incident, which occurred in an area of relatively high seabird densities. Given that the risk and mortality estimates are statistically indistinguishable, we estimate that on the order of 10,000 birds were killed by the Terra Nova spill.     

顾及有色噪声影响的位置域双频载波相位平滑伪距算法

载波平滑伪距技术是一种有效的GNSS数据处理技术,在很多高精度实时定位场合得到了广泛的应用。本文在随机模型中考虑载波相位时间差分观测量中有限冲激响应有色观测噪声的影响,推导出采用递归最小二乘方法的距离域和位置域双频载波相位平滑伪距算法,并利用实测数据验证了新算法的有效性。试验表明,相位平滑伪距能够减小伪距观测值的误差,提高伪距观测量的精度,从而提高定位精度;相对于传统的算法,距离域与位置域滤波的伪距平滑精度均有提高,三维定位误差精度均得到改善;同时表明,载波相位时间差分的有色噪声对平滑效果和定位精度有一定的影响。     

A CONVECTIVE RAINFALL ESTIMATE TECHNIQUE DEVELOPED BY NSMC OF CHINA*

In order to reveal the relation between strong convective cloud characteristics and rainfall rate,over 20000 hourly raingauge data from 333 weather stations and the corresponding 4000 convective cloud infrared images of GMS-4 during the period of 1992-1994 in Henan,Hubei and Sichuan Provinces were studied.The results show that cloud top temperature,temperature gradient,the growth of cloud,overshooting top and the normalized distance between a cloud covering pixels and the cluster center have certain relations to cloud precipitation.These relations can vary with different geographical regions.Based on the study above,a convective rainfall estimation technique was developed by the scientists in National Satellite Meteorological Center of China.Its average error is 30% for daily precipitation with a correlation coefficient of 0.69.