ON THE RESOLUTION OF H/V MEASUREMENTS TO DETERMINE SEDIMENT THICKNESS,A CASE STUDY ACROSS A NORMAL FAULT IN THE LOWER RHINE EMBAYMENT,GERMANY

In recent years, H/V measurements have been increasingly used to map the thickness of sediment fill in sedimentary basins in the context of seismic hazard assessment. This parameter is believed to be an important proxy for the site effects in sedimentary basins (e.g. in the Los Angeles basin). Here we present the results of a test using this approach across an active normal fault in a structurally well known situation. Measurements on a 50 km long profile with 1 km station spacing clearly show a change in the frequency of the fundamental peak of H/V ratios with increasing thickness of the sediment layer in the eastern part of the Lower Rhine Embayment. Subsequently, a section of 10 km length across the Erft-Sprung system, a normal fault with ca. 750 m vertical offset, was measured with a station distance of 100 m. Frequencies of the first and second peaks and the first trough in the H/V spectra are used in a simple resonance model to estimate depths of the bedrock. While the frequency of the first peak shows a large scatter for sediment depths larger than ca. 500 m, the frequency of the first trough follows the changing thickness of the sediments across the fault. The lateral resolution is in the range of the station distance of 100 m. A power law for the depth dependence of the S-wave velocity derived from down hole measurements in an earlier study [Budny, 1984] and power laws inverted from dispersion analysis of micro array measurements [Scherbaum et aL, 2002] agree with the results from the H/V ratios of this study.     

初中思想政治教学改革探索

笔者对初中政治课课堂教学模式进行尝试和探索。经过一年多的教学实践,总结出了思想政治课五步教学法,本文即是对这一教学方法的简单介绍,希望能对初中思想政治课堂教学改革有所启示。     

A Tale of Two Cities: A Decomposition of Recent Fertility Changes in Shanghai and Hong Kong

In the past 20 years, Hong Kong and Shanghai's total fertility rates (TFR) have undergone drastic changes: first declining and then rebounding. We use a decomposition method to assess changes in the TFRs of these two cities during the period 1990–2010. During the period of decline from 1990 to 2000, the decrease in marital fertility rate (MFR) was the major cause behind Shanghai's TFR decline; the decrease in nuptiality and MFR were equally responsible for the decline in Hong Kong's TFR. During the 2000–2010 period, although the decline in nuptiality exerted downward pressure on TFR, both cities experienced an increase in TFR mainly due to an increase in the MFR. Analysis of the difference in TFR between the two cities in 2010/2011, also reveals that Hong Kong's marriage delay has a negative impact on fertility and it is the higher MFR that leads to a higher TFR than Shanghai's TFR. It also shows that a reduction of first- and second-order births is equally responsible for Shanghai's lower MFR. Despite the one-child policy in Shanghai, some couples continue to postpone their first births, while others have even chosen to be childfree (a preferred term to ‘childless’). The tempo distortion is diminishing more prominently in Hong Kong, while the decline in fertility aspiration adds much uncertainty to future fertility trends in Shanghai.     

基于多层次灰色方法的旅游地产项目开发风险评价模型及实证研究

旅游地产是将旅游业和房地产两大产业融合而衍生出的一种新型地产开发模式,目前已经引起各地政府的高度重视,但在实际的开发与运行中存在着很大的风险性。因此本文对于旅游地产项目的开发风险从量化的角度进行分析评价,通过构建旅游地产项目开发风险的评价指标体系,以及采用主观的层次分析法与客观的变异系数法相结合的方法确定综合权重,以此建立起基于多层次灰色模型的旅游地产项目开发风险评价模型。并以A企业为例进行了实证研究,结果显示A企业的旅游地产项目开发风险处于一般风险与较低风险之间,适合进行项目的开发与投资。     

古物

古物指与考古学、历史学、古生物学及其他文化有关之物,其范围广、种类多,其保存价值以其时代、数量及其所具备的科学、历史和艺术价值为标准。我国的古物收藏,起自殷商,历经各代,在宋清两朝尤其兴盛,至西方学说传入后,古物被视为公有而供公众观赏。收藏古物,要重视其科学价值,不可收藏的古物应就地保存,可收藏的古物要遵循科学的方法。要认识古物的价值,用近代的方法研究、保存。     

南宋川陕战区兵力部署的失衡与吴曦之变

南宋在川陕战区兵力部署中,基于战略防御和节制武将的考虑,形成兴州、金州、兴元府三大屯驻重心。在具体兵力分布上,由于吴氏武将集团的影响,兴州驻军的数量与实力最为强大,呈现出严重的失衡状态。兴州驻军力量过于强大是吴曦据兴州叛变的关键因素。吴曦叛变平定后,南宋对兴州军事力量予以分化,又导致兵力分散和不利于边疆防御的弊端,体现出南宋削弱地方军事力量与加强边疆防御的两难困境。川陕战区兵力部署的演变,蕴涵着南宋加强中央集权的真实内容。     

商医灸焫考

商代甲骨文有"灸"字,见于《小屯南地甲骨》2219版,以往未能释出。本文首先考释此字为"灸",论证其为商代医学之治疗方法,也就是艾灸法,进而解读相关卜辞。商代灸焫法的揭示改变了灸法出现于汉代或其以后的旧有认识,对传统医学体系的重建及商代医学史的研究都具有重要的意义。     

关于中国古代海军史几个问题的再思考

哀公十年(前485年),吴徐承帅舟师沿海北上攻齐进行海战事,似难确认。襄公二十四年(前549),楚以舟师伐吴,是为史籍明确记载的第一次动用舟师的征战,但恐难排除此前已发生过动用舟师征战的事实,是故中国古代海军的产生(形成)时间,尚需进一步科学、准确论证。“海军”是个历史范畴,在不同的历史时期具有不同的形态,称谓也有所变化。中国古代海军的主要称谓有舟师、楼船军、水军、水师等。     

大预应力锚索在将军崖岩画保护中的选择与应用

文章介绍了大预应力锚索在将军崖岩画保护中的选择与应用,强调了科学技术在文物保护中突出作用。