基于PDA的改进编码法测图程序

阐述了改进编码法的基本思想、外业记录程序和数据重组,并对外业记录程序的数据结构和动态存储算法给出了有参考意义的代码.     

GF-5卫星高光谱影像数据质量评价与分析

目前遥感影像质量评价的指标与方法虽较为成熟,但尚未发现针对高分五号(GF-5)卫星AHSI影像数据质量评价及其可用性的全面研究。该文在分析高光谱影像质量评价方法的基础上,利用噪声标准差、清晰度和信息熵3个指标,对GF-5可见短波红外谱段的数据质量与可用性进行分析评价,结果表明:GF-5AHSI影像不同波段数据质量存在差异,影像信息主要集中在VNIR和SWIR第1-95波段内(受水汽影响的波段除外),SWIR中第43-50、96-112(1359.03~1418.17nm、1805.44~1940.15nm)共25个波段受水汽影响严重,不可用,第113-180(1948.57~2513.25nm)波段影像质量较差、噪声严重,阻碍了该波段的应用。研究结果可为GF-5AH-SI影像数据的处理与应用提供技术参考。     

地质调查产品有效供应理论分析

传统公共经济学中关于公共产品有效供应的分析在理论假设和数学模型上都存在问题。这种理论难以指导现实中公共产品的有效提供,尤其是日益重要的地质调查产品的有效供应。利用一般概率模型和信息经济学模型对地质调查产品的供应进行分析后可以得出对中国地质调查产品有效供应的更清晰的认识。     

基于合成孔径雷达的长江口海表流场反演

Range Doppler velocities derived from the Envisat advanced synthetic aperture radar（ASAR） wide swath images are analyzed and assessed against the numerically simulated surface current fields derived from the finite volume coastal ocean model（FVCOM） for the Changjiang Estuary. Comparisons with the FVCOM simulations show that the European Space Agency（ESA） Envisat ASAR based Doppler shift anomaly retrievals have the capability to capture quantitative information of the surface currents in the Changjiang Estuary. The uncertainty analysis of the ASAR range Doppler velocity estimates are discussed with regard to the azimuthal and range bias corrections, radar incidence angles, inaccuracy in the wind field corrections and the presence of rain cells.The corrected range Doppler velocities for the Changjiang Estuary area are highly valuable as they exhibit quantitative expressions related to the multiscale upper layer dynamics and surface current variability around the East China Sea, including the Changjiang Estuary.     

大菱鲆(Scophthalmus maximus)种业发展及相关前沿技术应用

大菱鲆(Scophthalmus maximus)是原产于欧洲的重要的特有名贵鱼类之一, 于1992 年被引 入中国。由于大菱鲆大规模人工繁育技术的突破, 使其成为中国沿海重要的经济鱼类。然而, 在繁育 过程中, 由于缺乏有效的亲鱼管理, 导致出现亲鱼近交, 结果造成严重的种质衰退。因此, 为了维持 大菱鲆产业健康、稳定、持续的发展, 自大菱鲆规模化养殖以来又开展了大菱鲆的遗传改良工作。 本文从繁育和选育两个方面回顾了近年来国内外大菱鲆种业的发展历程及现状, 总结了大菱鲆种业 发展的前沿技术及应用, 并对大菱鲆种业发展所需的技术研发趋势进行了展望。     

影响隧道超前预报探测距离的因素探讨

这里通过生产试验数据,分析了震源能量的大小、地质情况差异、以及声波噪音是如何影响地震波信号质量从而影响探测距离的。通过生产实践总结,提出了较有效地提高探测距离的办法。首先可通过生产试验确定炸药用量,使激发能量既不对支护造成伤害,又能达到较远的探测距离;地质情况通过影响采集数据长度影响探测距离,该因素是客观因素无法控制的;声波噪音是最难控制也是对探测距离影响较大的因素,可以根据声波能量和叠加到有效信号的时间,计算出不受声波干扰的预报距离,为评价预报结果提供参考依据。减小声波的影响可通过增加偏移距和压制声波能量的方法,压制声波能量可通过控制炮孔深度和倾角,炮孔的封堵,接收器的合理安装来实现。在实践中控制好声波噪音的影响,是提高探测距离的较为有效的途径。     

Sulfur-poor intense acid hydrothermal alteration: A distinctive hydrothermal environment

A fundamentally distinct, sulfide-poor variant of intense acid (advanced argillic) alteration occurs at the highest structural levels in iron oxide-rich hydrothermal systems. Understanding the mineralogy, and geochemical conditions of formation in these sulfide-poor mineral assemblages have both genetic and environmental implications. New field observations and compilation of global occurrences of low-sulfur advanced argillic alteration demonstrates that in common with the sulfide-rich variants of advanced argillic alteration, sulfide-poor examples exhibit nearly complete removal of alkalis, leaving a residuum of aluminum-silicate + quartz. In contrast, the sulfur-poor variants lack the abundant pyrite ± other sulfides, hypogene alunite, Al-leached rocks (residual “vuggy” quartz) as well as the Au-Cu-Ag ± As-rich mineralization of some sulfur-rich occurrences. Associated mineralization is dominated by magnetite and/or hematite with accessory elements such as Cu, Au, REE, and P. These observations presented here indicate there must be distinct geologic processes that result in the formation of low-sulfur advanced argillic styles of alteration.Hydrolysis of magmatic SO₂ to sulfuric acid is the most commonly recognized mechanism for generating hypogene advanced argillic alteration, but is not requisite for its formation. Low sulfur iron-oxide copper-gold systems are known to contain abundant acid-styles of alteration (e.g. sericitic, chloritic), which locally reaches advanced argillic assemblages. A compilation of mapping in four districts in northern Chile and reconnaissance observations elsewhere show systematic zoning from near surface low-sulfide advanced argillic alteration through chlorite-sericite-albite and locally potassic alteration. The latter is commonly associated with specular hematite-chalcopyrite mineralization. Present at deeper structural levels are higher-temperature styles of sodic-calcic (oligoclase/scapolite – actinolite) alteration associated with magnetite ± chalcopyrite mineralization. These patterns are in contrast to the more sulfur-rich examples which generally zone to higher pyrite and locally alunite-bearing alteration.Fluid inclusion evidence from the systems in northern Chile shows that many fluids contain 25 to >50 wt% NaCl_eq with appreciable Ca, Fe, and K contents with trapping temperatures >300 °C. These geological and geochemical observations are consistent with the origin of the low-sulfur advanced argillic assemblages from HCl generated by precipitation of iron oxides from iron chloride complexes from a high-salinity fluid by reactions such as 3FeCl₂ + 4H₂O = Fe₃O₄ + 6HCl + H₂. Such HCl-rich (and relatively HSO₄⁼-poor) fluids can then account for the intense acid, Al-silicate-rich styles of alteration observed at high levels in some iron-oxide-coppe-gold (IOCG) systems. The geochemical differences between the presence of sulfide-rich and sulfur-poor examples of advanced argillic alteration are important to distinguishing between system types and the acid-producing capacity of the system, including in the modern weathering environment. They have fundamental implications for effective mineral exploration in low-sulfur systems and provide yet another vector of exposed alteration in the enigmatic IOCG clan of mineral deposits. Furthermore, understanding the geochemistry and mineralogy of this distinct geologic environment has applications to understanding the acid generating capacity and deleterious heavy metals associated with advanced argillic alteration.     

基于探空和SSMI/S资料的AMSR-2海上大气可降水产品检验与评估

利用海岛探空资料和SSMI/S(special sensor microwave imager/sounder)–F16海上大气可降水量产品对AMER-2(advanced microwave scanning radiometer-2)2012年7月—2016年6月的海洋上空大气可降水量产品进行比对检验。结果表明:AMSR-2反演的海上大气可降水量与利用海岛探空资料计算所得值比对的一致性较好,两者之间平均偏差为0.35 mm;2012—2016年AMSR-2与SSMI/S-F16可降水月平均值的分布情况在热带辐合带、南太平洋辐合带和南大西洋辐合带可观测到相似的结构和特征,两者平均偏差为–0.04 mm,标准偏差为1.21 mm。检验的结果证明了AMSR-2反演的大气可降水产品精度满足产品设计指标,而误差分析的相应结论对于未来优化水汽反演算法具有重要意义。     

地下地质灾害地球物理探测研究进展

介绍了地下地质灾害地球物理探测方法的基本原理及其研究进展,指出目前常用方法的基本思路及其在实际应用中存在的主要问题,针对观测方法、观测系统、正反演模拟和室内试验研究等方面提出了大胆的构想和新的思路。     

基于GDS的黏土非线性渗透特性试验研究

基于黏土渗透性与孔隙比的非线性关系,讨论和总结了4种渗透模型,即 渗透模型、 渗透模型、 渗透模型和 渗透模型。来用GDS高级固结仪,对萧山黏土8个试样进行了一维固结渗透联合试验,使用直接法整理固结压力作用下渗透系数等试验结果,分析了对应于4种非线性渗透模型的土性参数。试验与分析结果表明,萧山黏土渗透性随固结压力增加呈现非线性减少,在50～1 600 kPa压力作用下其的渗透系数从8 ? 10-8 cm•s-1减少为8×10-9 cm•s-1;4种非线性渗透模型对萧山黏土都是适用的。