电气石对成岩成矿环境的示踪性及应用条件

本文在系统查阅国内外文献的基础上，结合对我国部分地区电气石的研究，讨论了电气石在不同成岩成矿环境中的鉴别特征及应用条件。在以火山岩和以沉积岩为含矿岩石的块状硫化物矿床中，电气石通常为富镁的镁电气石－黑电气石固溶体系列。在花岗岩、伟晶岩和细晶岩中，电气石有镁电气石－黑电气石固溶体系列→黑电气石－锂电气石固溶体系列→锂电气石和镁电气石－黑电气石固溶体系列→黑电气石电两个方向。此外，还提出了应用电气石指     

江山-绍兴断裂带在杭州湾延伸的探讨

江山-绍兴断裂带斜贯浙江境内,是我国东部一条重要的大地构造分区界线。在浙江陆区部分,江山-绍兴断裂带基本上顺浙赣铁路方向,从江山沿金衢盆地南缘,经乌灶至绍兴平水、富盛。过绍兴后,江山-绍兴断裂带是否继续向杭州湾海域延伸以及如何延伸,则认识分歧。     

塔里木河源流区气候变化和年径流量关系初探

基于1957~2003年塔里木河流域源流区长期监测资料,分析塔里木河流域源流区的主要河流年径流量和相应气温、降水变化的特点,探讨流域内气候变化与水资源量变化的关系。利用非参数检验的方法,分析温度、降水变化与径流量变化的关联性和一致性。结果显示:在塔里木河流域源流区,温度在0.05水平上呈现单调递增的趋势,降水则表现为不显著增加的走势,而径流量基本均出现了递增现象;从参数检验和非参数分析的结果看,温度升高与径流量增加的关联趋势更明显。     

ATLAS, and Wide-Angle Tail Galaxies in ATLAS

Using the Australia Telescope Compact Array (ATCA), ATLAS (Australia Telescope Large Area Survey) is imaging two fields totalling 7 square degrees down to 10 μJy beam^− 1 at 1.4 GHz. We have found 6 wide-angle tail galaxies (WATs), 4 of which have sufficient data to identify associated galaxy overdensities. The largest WAT, at a red-shift of 0.22, appears to be associated with an overdensity of galaxies that is spread over an unusually large extent of 12 Mpc, with a velocity range of 4500 km s^− 1. Here we present the WATs in ATLAS and discuss the implications of these observations for future large-scale radio surveys such as ASKAP-EMU.     

Tailed Radio Sources in the CDFS Field

Using 1.4 GHz ATCA & VLA images with 5.5 GHz ATCA data, we present a sample of 12 bent-tailed galaxies over the 4 deg² area of the Chandra Deep Field South (CDFS). We find 10 new sources, one of which is possibly the highest red-shift bent-tailed galaxy detected at z ∼ 2.     

基于项目式学习的红色文化研学旅行课程设计--以“天山脚下的纪念”为例

青少年红色文化研学旅行把爱国主义、红色传统和红色精神传播到青少年之中,具有特殊的意义。引导青少年坚定理想信念,为实现中华民族伟大复兴的中国梦努力奋斗,是红色研学旅行的重要任务。本文采用PBL模型,依托伊犁有关林则徐的历史文化资源,设计了以“天山脚下的纪念”为主题的高中学段研学旅行实践活动;引导学生通过了解林则徐传奇的一生,懂得继承和弘扬林则徐艰苦奋斗、爱国爱乡的情怀;最后对基于PBL模型的“天山脚下的纪念”研学旅行课程进行了反思。     

Flux density measurements for 32 pulsars in the 20 cm observing band

Flux densities are fundamental observational parameters that describe a pulsar. In the current pulsar catalogue, 27% of the listed radio pulsars have no flux density measurement in the 20 cm observing band. Here, we present the first such measurements for 32 pulsars observed employing the Parkes radio telescope. We have used both archival and new observations to make these measurements. Various schemes exist for measuring flux densities and we show how the measured flux densities vary between these methods and how the presence of radio-frequency interference will bias the flux density measurements.     

常用粮仓地坪沉降观测方法及精度分析

中央直属储备粮库是国家重要的基础设施,为确保新建粮库储粮安全,必须进行粮库新仓初始装粮压仓试验,利用仓内地坪沉降观测数据对云梯升降法、悬尺法、倒尺法的精度进行分析,得出倒尺法是仓内地坪沉降观测的最佳方法。     

论基岩滑坡的临床聚能与启程弹冲

剧动式高速滑坡是一种大量存在于自然界中的地质灾害。本文以广家崖斜坡危岩体为例,对基岩滑坡的“临床聚能”和“启程弹冲加速效应”进行了理论分析和探讨。文中详细论证了斜坡岩体滑落破坏时所具有的“启程弹冲加速效应”,并提出了二维应力状态下的启程冲速度计算公式。 启程弹冲机理,主要是锁固段岩体内聚力作用和岩体聚集赋存弹性应变能释放的反应,弹冲速度与内聚力的大小有直接关系。岩体一旦剪断破坏,弹性应变能骤然释放,岩体表现出剧烈的弹性回冲,弹性应变能便瞬间转化为岩体滑动的弹冲动能。这便从理论上对高速滑坡提出了具有实际意义的新机理。     

Ionization state of cosmic hydrogen by early stars and quasars

Cosmic hydrogen is reionized and maintained in its highly ionized state by the ultraviolet emission attributed to an early generation of stars and quasars. The Lyα opacity observed in absorption spectra of high-redshift quasars permits more stringent constraints on the ionization state of cosmic hydrogen. Based on density perturbation and structure formation theory, we develop an analytic model to trace the evolution of the ionization state in the post-overlap epoch of reionization, in which the bias factor is taken into ac-count. For quasars, we represent an improved luminosity function by utilizing a hybrid approach for the halo formation rate that is in reasonable agreement with the published measurements at 2 z 6. Comparison with the classic Press-Schechter mass function of dark matter halos, we demonstrate that the biased mass distribution indeed enhances star formation efficiency in the overdense environment by more than 25 per cent following the overlap of ionized bubbles. In addition, an alternative way is introduced to derive robust estimates of the mean free path for ionizing photons. In our model, star-forming galax-ies are likely to dominate the ionizing background radiation beyond z = 3, and quasars contribute equally above a redshift of z ～ 2.5. From 5 ≤ z ≤ 6, the lack of evolution in photoionization rate can thus be explained by the relatively flat evolution in star formation efficiency, although the mean free path of ionizing photons increases rapidly. Moreover, in the redshift interval z ～ 2 - 6, the expected mean free path and Gunn-Peterson optical depth obviously evolve by a factor of ～ 500 and ～ 50 respectively. We find that the rel-ative values of critical overdensities for hydrogen ionization and collapse could be 430% at z ≈ 2 and 2% at z ≈ 6, suggesting a rapid overlap process in the overdense regions around instant quasars following reionization. We further illustrate that the absolute esti-mates of the fraction of neutral hydrogen computed from theoretical models may not be important because of comparable uncertainties in the computation.