基于虚拟仪器技术的低频时码信号采集平台设计

介绍了最新的虚拟仪器开发平台LABVIEW的特点及应用 ,提出了利用LABVIEW实现低频时码信号的采集与显示的一种设计方法。该设计采用了软件设计技术 ,大大降低了测试设备系统的成本 ,并对于低频时码信号的分析与处理具有了更大灵活性。     

地下人防工程地面勘测定位的三种方法

重力勘探、空腔谐振法和主动源电磁信号寻踪法三种地下人防工程地面勘测定位方法。对主动源电磁信号寻踪法做了较详细的介绍。用上述方法对城市地下人防工程进行地面勘测定位是行之有效的方法，并用实例展示了该方法的应用前景。     

FAST APPROXIMATE INVERSION OF MAGNETOTELLURIC(FAIMT) DATA FOR A HORIZONTALLY LAYERED EARTH WITH NEAR-SURFACE INHOMOGENEITIES

IwrRODUcrIONNearsurface2-Dand3-DinhomogeneousdistortionsinMTdatamakeitdimculttointerpretMTdataevenwhentheregionalorbasinstruCturescanbetreatalas1-dfornsionalnyohmann,l975,Weide1t,l975,Wannamakeretal.,l984,LaTormcaetal.,l986,Zhang,l987,TorresWhrdinetal.,l992).Inthelasttwentyyears,2-Dand3-DmodelinghavebeenaanmPlishedbyusingnumricalmethods.Afteranalyringthesefor-wardmodelingresultS,wenowdeariyunderstandthemaorphySica1meCanisrnsasultingfromthesedistortionsofnear6urfaceinhomogeneities(Pa…     

厘米波段背景噪声电平的测量方法及数据分析

论述了厘米波段天线背景噪声电平测量的重要作用、基本条件和要求。介绍了其测量系统灵敏度的估值方法，及在工程上用定标的技术参数计算灵敏度的公式。测量结果表明理论计算和测量数据处理结果符合得很好，证明该测量系统的灵敏度估算、工程计算方法及实施的测量方法是科学的、严密的，测量的数据是真实的、准确的。同时给出系统测量原理方框图，定标的技术参数和技术路线等，并对测量结果进行了分析和讨论。     

短时傅立叶变换在研究沉积旋回地质体中的应用

针对地震波信号通常是非平稳信号,Fourier变换不适用于分析非平稳信号、不能反映局部时间信号的频谱特征的特点,而利用短时Fourier变换能够反映信号在任意局部时间范围的频率特征,以便满足研究信号在不同时间位置局部性质的要求。分别从正反旋回的地质模型出发,通过作理论记录以及用短时Fourier变换分析波在沉积旋回地层中传播时的频率变化来确定沉积旋回的类型。     

Diversification of landslide areas as a means for reducing noise in dendrogeomorphic dating

The result of tree-ring-based reconstruction of past landslide events is often the development of a single total chronology. This approach can be very effective for small homogeneous landslides. However, compiling chronological data from heterogeneous (often independent) zones of large complex landslide areas into one chronology can induce over- or underestimation of some events, resulting in lowered reliability of the reconstruction. The solution for elimination of this effect can lie in the diversification of complex landslide areas into homogeneous zones with separate analyses. The aim of this study was to quantify the effect of this separation on detected slope movement events and to define parameters whose investigation could distinguish events (sliding) from noise (creeping).For this purpose, 412 tree-ring series from 206 disturbed common spruce (Picea abies (L.) Karst.) occupying complex landslide areas were dendrogeomorphically analysed. The landslide area was divided into five homogeneous zones using geomorphic mapping, LiDAR-based DEM and geophysical sounding (ERT). Five events (verified in individual zones) were detected in the total chronology. Two extra events in the total chronology (28.6%) were considered noise. Moreover, two zonal events were detected but not recorded in the total chronology. This indicates that the noise in the total chronology of the complex landslide area could reach more than a quarter of dated events. Next, true slide events and noise (caused by creep) were differentiated in the structure of growth disturbances (reaction wood vs. abrupt growth suppression) and their proportion in event reconstruction, spatial patterns of trees containing slope movement signals, and the character of triggers. Thus, for better filtering of noise from signals in tree-ring-based chronologies of landslides, not only observations of dendrogeomorphic index values but also the morphology of landslides and characteristics of dated processes must be considered.     

闽北邵武地区萤石矿综合信息找矿方法研究

福建邵武地区萤石矿属热液充填型, 萤石矿赋存于NE向、近SN向断裂破碎带中。目前萤石矿找矿工作逐渐向隐伏矿和深部矿转移, 本文通过该区张厝萤石矿预测区物化探综合信息方法找矿实例, 探讨隐伏-隐半伏萤石矿物化探综合预测方法组合。结果表明: 区域化探、高精度磁测、视电阻率联合剖面和可控源大地音频电磁测深等物化探技术方法组合对热液充填型萤石矿勘查评价具有较好的效果。     

New insights into petrogenesis of Miocene magmatism associated with porphyry copper deposits of the Andean Pampean flat slab,Argentina

The Paramillos de Uspallata mining district located in the backarc region of the Pampean flat-slab segment(28°-33°S) features porphyry-type deposits genetically associated with Middle Miocene volcanics. This mineralizing magmatism comprising hydrothermally altered(sodic-calcic, potassic and phyllic alteration) subvolcanic and pyroclastic rocks of andesite-basaltic andesite and dacite-rhyolite composition with a typical arc signature, represents the eastward broadening of the Farellones arc by ~17 Ma. Its geochemistry also reveals a residual mineralogy of amphibole ± garnet with limited plagioclase fractionation resulting in an adakitic signal; however, according to the isotopic data collected in our study, the contributions of MASH(melting-assimilation-storage-homogenization) processes in the acquisition of this signal cannot be disregarded.Both the broadening of the Farellones arc and its residual mineralogy e typical of relatively deep magmatic chambers e are consistent with a slab shallowing and outcoming crustal thickening setting.This tectonic scenario could be interpreted as a result of an early effect of the Juan Fernandez Ridge collision that was further to the north by ~17 Ma. Our findings suggest that magmas were fertile for porphyry type deposits during the early stages of the slab shallowing.     

全张量重力梯度数据垂直分量噪声滤除方法研究

全张量重力梯度数据中含有高频成分,为了在去除高频噪声的同时,保留浅部小异常体信息,本文利用最小二乘原理,求解重力梯度垂直分量与重力数据联合约束下的超定方程组。结果表明,随着计算窗口的增大,去噪效果越来越好,对于本文所设计的模型,当计算窗口增大到32×32时,重力数据中99%以上的噪声被去除,张量数据Vxz、Vyz中,分别有大约40%、50%的噪声被去除;同时,浅部小异常体信息几乎全部保存。