彩色扫描地图自动分色系统中彩色识别问题的探讨

主要讲述了彩色地图扫描自动分色的必要性,分析了扫描图数据产生颜色误差的原因,讨论了在分色过程中色彩空间转换的问题,最后得到了分色结果并对结果进行了探讨。     

Information Detection of Seismic Debris Flow by UAV High-resolution Image Based on Transfer Learning

A large number of debris flow disasters (called Seismic debris flows) would occur after an earthquake, which can cause a great amount of damage. UAV low-altitude remote sensing technology has become a means of quickly obtaining disaster information as it has the advantage of convenience and timeliness, but the spectral information of the image is so scarce, making it difficult to accurately detect the information of earthquake debris flow disasters. Based on the above problems, a seismic debris flow detection method based on transfer learning (TL) mechanism is proposed. On the basis of the constructed seismic debris flow disaster database, the features acquired from the training of the convolutional neural network (CNN) are transferred to the disaster information detection of the seismic debris flow. The automatic detection of earthquake debris flow disaster information is then completed, and the results of object-oriented seismic debris flow disaster information detection are compared and analyzed with the detection results supported by transfer learning.     

Definition of subsoil structure and preliminary ground response in Aigion city (Greece) using microtremor and earthquakes

An extensive campaign—including detailed geologic and geotechnical surveys both existing and news as well as noise measurements—was conducted along a cross-section in order to define both geometry and soil properties (mainly the shear wave velocity) of the main formations in Aigion city. Aigion city is located in the Gulf of Corinth, Greece, a highly seismic region of the Aegean Sea. The main objective of the accurate 2D soil model is its use in site response modeling and in the interpretation of observations from a vertical down-hole accelerograph array. This model revealed a complex geologic structure with a multi-faulted shear zone related to the Aigion fault. The defined subsurface structure offered the possibility for its correlation with estimated site effects, in terms of spectral ratios. Two different data sets, earthquakes recorded at down-hole accelerograph network and noise measurements at 17 sites, were used. To translate the empirical transfer functions with the geologic structure, the 1D estimates were also computed. All these results are consistent, indicating a satisfactory correlation between the soil model and preliminary site response.     

马陵山台地磁异常与地震关系的研究

用一阶差分法分析了马陵山台与泰安台地磁场垂直分量Z的变化,用转换函数法分析地磁场3个分量ΔZ、ΔD、ΔH的变化,用加卸载响应比法研究了地磁场极值的变化。 研究发现在中强地震前马陵山台的地磁场值存在明显的异常变化。 此结果对地震预报有一定的实用价值。     

山西数字测震台网数字地震仪传递函数的测定及特性分析

介绍了山西数字测震台网EDAS-24IP+BBVS型数字地震仪传递函数的特征和测定方法,对地震仪阶跃标定及正弦标定计算分析,得出台站工作状态、地震计周期、阻尼、主零极点参数的变化情况;并对数字地震仪的频带范围、通频带的平坦程度、三分向幅频响应的一致性进行了讨论和分析。认为台网的系统特性是稳定和可靠的。     

省级公众气象信息服务业务系统

为适应公众气象信息服务的需求,提高公众气象服务的针对性、及时性与准确性,满足政府决策及社会广大专业用户的各类需求,改建和扩充了省级公众气象信息服务业务系统。系统包括 “12121”声讯子系统、手机短信业务子系统、公众气象信息服务分布式大型数据库、公众气象信息产品制作子系统和媒体气象信息业务子系统。分别从系统的设计思路、系统总体结构、各子系统功能及系统在投入使用后取得的效益等方面进行了概述。     

敦煌戈壁不同近地层大气稳定度下的感热交换系数

首先利用空气动力学法,计算分析了敦煌戈壁2000年9月—2001年9月的感热交换系数Ch的特征,计算得到Ch的年平均值为0.00203±0.00045。敦煌戈壁的Ch在近中性和中性条件下(-0.01<ζ<0.01,ζ为Monin-Obukhov大气稳定度参数)为常数,Chn≈0.0020;在稳定条件下(ζ≥0.01),Ch比较小,随地表风速的增大而增大,趋于Chn,它们之间存在的关系是:Ch=0.0012 0.0003ln(V);在不稳定条件下(ζ≤-0.01),Ch比较大,随地表风速的增大而减小,也趋于Chn,它们之间存在的关系是:Ch=0.0026-0.0002ln(V)。本文还利用地表温度、一层气温和一层风速近似计算了总体Richardson数Rb,判定大气的层结稳定度,再根据该稳定度来选择感热交换系数。     

洞体应变对高频气压波响应的传递函数——以陕西宁强台为例

自2011年观测以来,陕西宁强台洞体应变的高频气压效应甚为显著,但其频率依存性至今尚不明晰。为此,本文尝试采用相干函数和传递函数等方法,对该台2019年1月1日—4月2日的洞体应变和气压数据进行了系统诊断。结果表明,在8～40cpd频段内,洞体应变对气压具有较强的频率依赖性,即气压系数和相移均会随频率的变化而呈现非线性变化,其中,最大气压系数为7.80×10^-9/hPa,相位超前可达108.27°,且NS和EW分量的气压响应有所差异。上述结果将有助于该台高频噪声的物理溯源,同时还能为高频气压效应的分频段改正等提供量化依据。     

Influence of earthquake frequency content on soil dynamic properties at CAO site

The installation of vertical downhole arrays in the field that record the soil behavior during earthquakes, has opened the opportunity of exploring another alternate method for assessing the soil dynamic properties by solving the inverse problem. This article proposes a methodology for solving this problem using spectral analysis of downhole arrays records. The one-dimensional shear wave propagation model was used, considering a homogeneous-viscoelastic medium. This methodology was applied at the site known as Central de Abasto Oficinas (CAO), which is located in the lake zone of the Mexico City. The results indicate that even relatively low frequencies have a noticeable effect on dynamic soil properties. Shear modulus increases and damping ratio lessens when the frequency rises.