多尺度下中国人口老龄化风险集群的时空格局——Flexible空间扫描计量方法的应用

运用Flexible空间扫描计量方法,对比分析了省、市和县域尺度上的老龄化风险集群的时空格局。发现：老龄化成为全国人口结构转型的主旋律,少子化成为新常态,老龄化区域非均衡加剧,并存多种区域模式;三种尺度识别出的风险集群都集中分布于东南半壁;集群的风险程度与地域范围随时间不断扩大,但集群间的风险差异趋于缩小。总体而言,尺度越小,识别出的集群分布越分散,定位越精确,风险越高,差异越大。针对不同地区的人口-经济发展情况,提出保障生育,发展养老产业,基本公共服务均等化,就地、近城镇化等的老龄化风险应对策略。     

The Accumulation of Silica in Lakes

On the basis of available data on recent and fossil lake sediments with a high content of authigenic silica—diatomite—an attempt is made to identify those factors in the surrounding landscape and in the lake environment that account for the formation of these siliceous sediments. The presence of cause-and-effect relationships and the wide distribution of siliceous lake sediments, both at present and in the geological past, suggest that diatomite lakes can be treated as a distinctive lake type in a lake typology and limnological regionalization previously proposed by the author.     

中国居民消费增长波动多尺度变化及趋势研究

采用经验模态分解(EMD)方法对1953-2009年中国居民消费增长率波动进行分解,得到其IMF分量及趋势分量RES,运用方差贡献率及相关性检验其周期变化,并利用Mann-Kendall非参数统计检验方法对增长趋势进行研究。结果表明:中国居民消费增长波动存在3年、8年和12.4年的准周期,以准8年周期为主,准3年周期次之;56年来居民消费呈波动增长趋势,1978年是其突变点,当年对外开放政策的提出极大促进了居民消费增长,1983年居民消费增长率超过临界直线,此后呈显著上升趋势。经济因素、居民收入水平和消费结构是影响中国居民消费增长波动的主要因素。     

Crustcrumbs in the carriage: a cognitive reading of Leopold Bloom in the “Hades” episode of Ulysses

This article investigates a commonly held critical conception of Leopold Bloom by questioning where his cognitive processes are situated. It argues that throughout Joyce's “Hades” episode, Bloom's mind seeps out into the storyworld, offloading onto his material setting. Bloom reflects on his dilemmas using different cognitive markers throughout his environment. As representational cues, they allow him to process his insecurities about his paternal and conjugal roles. A cognitive frame reveals how Bloom's kind acts often originate from his personal and familial preoccupations rather than what has been previously represented as genuine human sympathies. It shows Bloom as even more purposefully strategic than the Homeric parallels identified by most critics have traditionally conceived. Not only do we gain a greater depth of understanding about Bloom's character through an analysis of the situated mind; we also see thematic threads unfolding through objects and characters in ways previous scholarship has not seen. These thematic threads constitute substrata that further disclose the complexity and depth not only to Bloom's character but also Ulysses as a whole.     

Allochthonous red pigments used in burial practices at the Copper Age site of Valencina de la Concepción (Sevilla,Spain): characterisation and social dimension

The use of red pigments linked to burial practices is widely documented in the Iberian prehistoric record and very often it has been traditionally interpreted as a ritual practice entailing the utilisation of local raw materials (iron oxides). Some research works, nevertheless, have also detected the use of red pigments which can only be interpreted as allochthonous. The red pigments spread over a single inhumation in a monumental Megalithic tomb surrounding Valencina de la Concepción Copper Age settlement was studied by means of X-ray diffraction, field emission scanning electron microscopy with energy dispersive X-ray spectroscopy, X-ray microfluorescence, micro-Raman and Fourier transform infrared spectroscopies. This approach allowed characterising the red pigments as cinnabar, mixed with tiny amounts of iron oxides. The presence of cinnabar, a product that was necessarily imported, in a context of an exceptional set of grave goods, suggests that the use of cinnabar was linked not only to ritual but also to practices related to the display of social status.     

STRONG MOTION VERSUS WEAK MOTION: IMPLICATIONS FOR MICROZONATION STUDIES

A set of mainshock and aftershock data following the Chamoli earthquake of March 29, 1999, recorded at a single station viz. Gopeshwar, has been studied. Particularly, the utility of the use of aftershock/weak motion data for site characterisation in seismic microzonation studies is investigated. The analysis of aftershock and mainshock data indicates that the spectral shape and amplification is quite different during the main-shock and the aftershock. This, in turn, implies that the use of weak motion/aftershock records may lead to erroneous conclusions regarding the expected ground motion during a strong earthquake. Further, it has been shown that the site characteristics estimated from H/V ratios are not stable in the near field conditions, even for weak motion data.     

Breccia verde di Sparta,an elusive decorative stone used in antiquity

Breccia verde di Sparta is the traditional name given by the Roman marmorarii of the 19th century to a brecciated volcanic rock whose unknown precise provenance has been determined here for the first time through exploration of the broader area of Psefí (south of Krokees, province of Sparta, Peloponnese, Greece). This location was well known in antiquity and in modern times for having been exploited by the Romans for an important green porphyry named lapis lacedaemonius, nowadays also known as porfido verde antico. This breccia has been seldom used in Roman times for opera sectilia; in contrast, it appears more frequently reused in medieval floors; it is also frequently present in historical lithotecs formed in the 19th and 20th centuries. To fully characterise it and determine its relationships with green porphyry, breccia verde di Sparta samples from the newly discovered source have been thoroughly studied minero-petrographically and geochemically, and their complex genesis has been reconstructed. It appears that after extrusion the original brecciated basaltic andesite underwent extensive hydrothermal low-grade metamorphism, with a complete alteration of the igneous assemblage and minerals that preserved only part of the clinopyroxene phenocrysts. Alteration was accompanied by crystallisation of abundant epidote and chlorite, which imparted its predominant green colour to the rock. These breccias intruded in the lithoclases of the porphyry.     

Experimental analysis of rubble stone masonry walls strengthened by transverse confinement under compression and compression-shear loadings

Stone masonry walls of ancient buildings have reasonable resistance to vertical loads but lower resistance to shear forces and reduced tensile strength. However, to achieve such compressive strength the masonry must not disaggregate when subjected to loading. This can be achieved if during the construction of the walls larger stones, usually referred as “through stones”, are used, spanning the thickness of the wall, making it possible to improve the transverse confinement of the masonry. For rehabilitation projects and structural reinforcement of such buildings, the transverse confinement can be achieved by fixing steel elements perpendicular to the wall. This confinement technique is often part of a more comprehensive rehabilitation solution, which includes the application of mortar or concrete reinforced layers applied to the wall surface.

This article presents results of an experimental research on material properties and mechanical characterisation of stone masonry specimens strengthened by two transverse confinement solutions (independent steel reinforcing rods and continuous steel ribbons wrapping the specimen). Specimens were tested under compression and compression and shear loadings.

This experimental work is part of a major research project to study the mechanical behavior of URM and strengthened walls, and the characteristics of the building materials of such specimens.     

Microstructures of Building Materials from Huaca De La Luna,Peru

ABSTRACT

The microstructures of building materials from the archaeological complex of Huaca de la Luna on the northern coast of Peru is assessed for the first time by a multiscale approach. The multiscale microstructural characterization used laboratory techniques including optical microscopy, scanning electron microscopy, X-ray microtomography, and both gas and powder pycnometry. Optical microscopy revealed the presence of organic matter and shell fragments and X-ray microtomography showed differences in the sizes and connectivity of pores. The BET (N₂ gas adsorption) specific surface areas showed greater presence of clayey matrix in the mortars. No significant differences among mortars and brick fragments mineralogy were detected by X-ray diffraction, so the larger amount of fine binding matrix in the mortars suggests that they were produced blending raw material with different grain sizes. The aim of this study is to provide data that can be used for a better understanding of the Moche culture, its construction techniques, and to support conservation strategies of the archaeological heritage.