Peculiar velocities of 3000 spiral galaxies from the 2MFGC catalog

The 2MFGC catalog we have used contains 18020 galaxies selected from the extended objects in the 2MASS infrared sky survey as having apparent ratios of the axes b/a<0.3. Most of them are spiral galaxies of later morphological types whose disks are seen almost edge-on. The individual distances to the 2724 2MFGC galaxies with known rotation velocities and radial velocities are determined using a multiparameter infrared Tully-Fisher relation. A list of the distances and peculiar velocities of these galaxies is presented. The collective motion of the 2MFGC galaxies relative to the cosmic microwave background is characterized by a velocity V = 199 ± 37 km/s in the direction l = 304° ±11°, b = −8°±8°. Our list is currently the most representative and uniform sample for analyzing non-Hubble motions of galaxies on a scale of ∼100 Mpc. __________ Translated from Astrofizika, Vol. 49, No. 4, pp. 527–540 (November 2006).     

Measurement of the atmospheric muon depth intensity relation with the NEMO Phase-2 tower

The results of the analysis of the data collected with the NEMO Phase-2 tower, deployed at 3500 m depth about 80 km off-shore Capo Passero (Italy), are presented. Čerenkov photons detected with the photomultipliers tubes were used to reconstruct the tracks of atmospheric muons. Their zenith-angle distribution was measured and the results compared with Monte Carlo simulations. An evaluation of the systematic effects due to uncertainties on environmental and detector parameters is also included. The associated depth intensity relation was evaluated and compared with previous measurements and theoretical predictions. With the present analysis, the muon depth intensity relation has been measured up to 13 km of water equivalent.     

Downward transfer of momentum by wind-driven waves

A model for the downward transfer of wind momentum is derived for growing waves. It is shown that waves, which grow due to an uneven pressure distribution on the water surface or a wave-coherent surface shear stress have horizontal velocities out of phase with the surface elevation. Further, if the waves grow in the x-direction, while the motion is perhaps time-periodic at any fixed point, the Reynolds stresses associated with the organized motion are positive. This is in agreement with several field and laboratory measurements which were previously unexplained, and the new theory successfully links measured wave growth rates and measured sub-surface Reynolds stresses. Wave coherent air pressure (and/or surface shear stress) is shown to change the speed of wave propagation as well as inducing growth or decay. From air pressure variations that are in phase with the surface elevation, the influence on the waves is simply a phase speed increase. For pressure variations out of phase with surface elevation, both growth (or decay) and phase speed changes occur. The theory is initially developed for long waves, after which the velocity potential and dispersion relation for linear waves in arbitrary depth are given. The model enables a sounder model for the transfer to storm surges or currents of momentum from breaking waves in that it does not rely entirely on ad-hoc turbulent diffusion. Future models of atmosphere-ocean exchanges should also acknowledge that momentum is transferred partly by the organized wave motion, while other species, like heat and gasses, may rely totally on turbulent diffusion. The fact that growing wind waves do in fact not generally obey the dispersion relation for free waves may need to be considered in future wind wave development models.     

自动剪断线算法的设计与实现

结合相关几何学原理,阐述了线段之间存在的空间拓扑关系,并结合当前线段相交算法的优缺点,提出了判断线段间有唯一实交点的混合判断方法,并在此基础上完成了对自动剪断线算法的设计与实现。     

采动影响下矿井突水水源Fisher判别与地下水补给关系反演

为了揭示采动影响下矿井突水水源误判原因,进而推测地下水补给关系,收集了朱仙庄煤矿历年水化学资料,建立了突水水源的Fisher判别模型,并根据水样误判结果以及矿井地质与水文地质条件,反演分析了地下水补给关系.研究结果表明朱仙庄煤矿煤系砂岩裂隙含水层全部水样回判正确,含水层较为封闭,与其他含水层无水力联系;新生界第四含水层、侏罗系砾岩含水层与石炭系或奥陶系灰岩含水层部分水样误判,矿井采动影响下不同时期含水层间的地下水存在不同程度的水力联系,矿井新生界第四含水层水源对侏罗系砾岩含水层存在补给,石炭系或奥陶系灰岩水则通过矿井南部露水补给新生界第四含水层.地下水动力条件的变化验证了地下水补给关系.建立突水水源判别模型,分析回代误判原因,反演地下水补给关系,为正确认识矿井采动影响下地下水循环条件提出了新的研究手段.     

基于稀疏约束反演谱分解的频变AVO储层识别方法

时频分析技术是描述和分析非平稳信号的有效工具,如何提高谱分解的时-频分辨率受到了国内外学者的广泛关注.基于稀疏约束反演的谱分解方法（ISD）是近些年提出的一种具有高时-频分辨率的谱分解方法.然而传统ISD方法采用复雷克子波作为母小波函数,很大程度限制了信号分析的分辨率和精度.本文创新性地将传统ISD方法拓展到其他线性变换当中,提高了ISD方法的适用性.利用合成数据测试并对比了传统方法与ISD方法的时频分析结果,研究表明ISD方法不但能提供高分辨率的振幅谱,还能提供可靠的时-频相位谱信息.在此基础上,本文提出将高时-频分辨率的ISD方法与频变AVO（FAVO）反演相结合,得到能指示流体的地震波频散属性.将该方法应用于实际资料,结果表明基于ISD时频方法的FAVO反演结果具有更高的分辨率和准确度,对于储层油气具有更好的指示作用.

     

数字水印技术在矢量地图中的应用

介绍了数字水印技术和矢量地图,综合分析了水印的嵌入对矢量地图质量的影响,论述了国内外现有的矢量地图数字水印技术的研究现状.最后总结了现有矢量地图数字水印技术存在的问题,并指出了需要进一步研究的方向和重点.     

GIS中几何对象之间的空间关系

几何对象之间的空间关系是GIS研究的重要理论问题之一，在分析ArcInfo和OpenGIS对空间关系描述的基础上，运用基于维数扩展的9交模型，得到在实际应用中基本的空间关系分类，并对空间关系的进一步研究提出了展望。     

基于9-Intersection模型的模糊空间对象间的拓扑关系研究

本文将从地理认知的角度上分析并选择一个适合于在GIS中应用9-Intersection模型的模糊空间对象的边界定义,并构建一个能够采用9-Intersection模型精确判断模糊空间对象之间拓扑关系的模糊拓扑空间(CITfts),并进行相应的证明,最后建立简单模糊区域,采用empty/no-empty算子给出模糊空间对象之间的拓扑关系的表达形式。     

天然水镁石纤维的化学松解技术

研究了不同表面活性剂对不同等级水镁石纤维的松解效果,通过对纤维悬浮液叩解度、粘度、纤维表面Zeta电位、纤维混凝土强度等的研究,并经扫描电镜分析,证明了化学松解工艺对水镁石纤维具有较好地劈分作用。表面活性剂种类及用量对纤维的叩解度、纤维的表面电位、悬浮液粘度均有影响,对不同等级纤维的影响有差异。随表面活性剂用量增加,纤维的叩解度、纤维表面的负电荷量、悬浮液的粘度一般均呈增加趋势。经过化学分散试验,水镁石纤维得到了较好松解,纤维直径由微米级下降至纳米级。将水镁石纤维应用于混凝土,抗折强度随纤维叩解度的增加而提高,说明纤维的化学分散有利于纤维对混凝土增强作用的发挥。