Simulation of gravity wave effects under solstice conditions using a 3-D circulation model of the middle atmosphere

Vertically propagating gravity waves can transport momentum and energy from the troposphere up to the mesosphere and thus modify the circulation of the middle atmosphere. The effects of regional gravity wave sources, together with temporal changes of gravity wave activity, are studied under solstice conditions in a 3-D circulation model using a simplified parameterization scheme for the gravity momentum deposition. In this way we can reproduce the reversal of the mean zonal wind with height and very low temperatures at the summer mesopause region. Using a stochastic forcing by taking the gravity wave parameters at random, characteristic oscillations are found with periods in the planetary scale range (2, 4 and 5 days) and in the tidal range (1 day, 16 h and 12 h).     

The vertical distribution of CH4, N2O,CFC-12 and CFC-11 in the middle atmosphere at mid-latitudes

CH₄, N₂O, CFC-12 and CFC-11 data analysed from samples collected by means of cryogenic samplers from five balloon flights conducted during the 1982–1984 period, are presented. The vertical distributions of these gases show structures with dominant scale size of 16 ±2.5 km. The amplitude of the perturbation is larger for the species having steeper gradient. A comparison of the present results with the results of earlier measurements representing the period of 1977–1979 do not show any appreciable change in the mixing ratios of CH₄ and N₂O. However, an average tropospheric increase of (6.5±1)% per year is found for CFC-12 and CFC-11. This annual change in the mixing ratios of CFC-12 and CFC-11 is found to increase with height suggesting a time lag of about 6 years between the troposphere and the altitude region around 25 km. The average mixing ratios of CH₄ and N₂O are compared with the available satellite/spacelab data. This data set shows a satisfactory agreement with the present in situ measurements for the height region above 30 km.     

Foil chaff clouds as a tool for in-situ measurements of atmospheric motions in the middle atmosphere: their flight behaviour and implications for radar tracking

The aerodynamic behaviour of foil chaff (rectangular plates) used for in-situ measurements of atmospheric motions in the middle atmosphere (up to 100 km altitude) can be described by Stokes' Law in which the corrections are applied to the coefficient of viscosity. The results obtained with this approximation are in good agreement with observations and allow us to explain in detail certain peculiarities occasionally seen in the tracking of chaff clouds by radar.     

The origins of pottery as a practical domestic technology: Evidence from the middle Queen Creek area, Arizona

The site of Finch Camp in the middle Queen Creek area of Arizona, southeast of Phoenix, has produced some of the earliest evidence of utilitarian pottery use in the US Southwest. Using multiple lines of evidence from vessel morphology, surface alteration, and minute fatty acid residues in vessel walls, I evaluate the nascent function of the earliest vessels (mostly neckless jars, or tecomates) and infer a diachronic process of functional expansion from about 350 B.C.-A.D. 400. This evidence provides robust evidence for evaluating various theoretical models of pottery origins. I argue that utilitarian pottery was initially adopted in connection with the intensification of small particulate plant foods (e.g., seeds, grains) and increasing household-level control over resources. Further, vessel functions may have expanded during the early centuries A.D. in response to women’s task-scheduling conflicts stemming from increasing residential stability and growing reliance on low-level horticulture.     

The transition from polis to kastron in the Balkans (III-VII cc.): general and regional perspectives

Abstract

Much of the evidence for the changes which scholars perceive in the Late Roman-to-Early Byzantine periods (the ‘Late Antique era’) and in the ‘Dark Age’-to-Middle Byzantine periods in the eastern empire, that is, changes occurring between the mid third and the eighth-to-ninth centuries, whether this evidence is textual, archaeological, or topographical, concerns in one way or another what might be called the upper levels of the settlement-system. These levels consist of settlements or sites distinguishable at various times from the undefended rural majority (or what in most areas forms the majority) of settlements by status (i.e., civic, that of a polis), form, size, situation, or associated functions. They may for present purposes be simply categorised as civic urban settlements, non-civic urban settlements, and non-civic nonurban fortifications or fortified settlements. To study the fate of such places, as settlements and as communities, is to confront the cultural, economic, and internal political history of the period in all its complexity, a task which in most respects is inconceivable without recourse to archaeology and topography. The following observations concern the need to rectify some imbalances in the emphases of research which distort some general analyses of the history of Late Antique and also Middle Byzantine settlements, and so distort our view of cultural, economic, and political change in the periods named.     

Transfer of population as a solution to international disputes: population exchanges between Greece and Turkey as a model for plans to solve the Jewish-Arab dispute in Palestine during the 1930s

The author explores the reasons for the failure of a plan for population exchanges that took place between Jews and Arabs in Palestine in the 1930s. Special focus is given to the success of previous exchanges between Greece and Turkey that took place during the 1920s and why this model failed in Palestine. The author concludes that "the Zionist plans which assumed that one could encourage voluntary transfer by creating attractive economic conditions in the target areas, did not take into account the factors of nationalism, ties to place of residence, religion, etc. These factors carried no less weight than the economic factor and they could effectively prevent any voluntary transfer of the Arab population."     

The bamboo raft as a key to the introduction of the sweet potato in prehistoric Polynesia

The idea that American Indians played no part in Polynesian prehistory originated with J.R. Forster, a companion of Cook on his second voyage. Forster made a comparative study of five Polynesian languages, using a basic list of 40 words that included 'sweet potato'. He concluded that although there were many similarities between those languages and the languages of Southeast Asia, 'no distant or accidental similarity' existed between the Polynesian and American languages. Moreover, the 'wretchedness and small size' of American sailing craft proved 'incontestably' that the Pacific Islanders had not originated in the Americas. The premises for Forster's claims have long been proved to be wrong. Yet many scholars still accept his main conclusion. This article contraverts that view. It argues that voyagers from Mindanao crossed the Pacific to Ecuador in about 200 BC on a bamboo raft and that this became the prototype of the balsa rafts of Ecuador and Peru of early Spanish times. Such rafts made prehistoric voyages to Mexico, south-central Chile, and the Galapagos Islands. Easter Island's first settlers, it is argued, were drifted there in a balsa raft. A new claim that Polynesians from Easter Island sailed to South America and returned with the sweet potato and bottle gourd is also discussed.     

The production and technology of glazed ceramics from the middle ages,found in the saepinum territory (Italy): a multimethodic approach*

A collection of ceramics from the Middle Ages found in Altilia and Terravecchia (the Saepinum area, Campobasso, Italy) were characterized by using different mineralogical analyses to investigate their provenance and production techniques. The body ceramic was investigated using Rietveld phase analysis of X‐ray powder diffraction patterns, X‐ray fluorescence spectrometry and scanning electron microscopy. The chemical compositions of the coatings were measured by scanning electron microscopy and their mineralogical compositions were determined using a particular technique of X‐ray small‐angle scattering (SAS) optimized for studies of thin films. Moreover, the material used for decoration was studied using micro‐Raman spectroscopy. The archaeometric results confirmed the distinction into two different ceramic classes, already individuated from archaeological analysis: the Altilia objects belong to the protomajolica class, whereas the objects from Terravecchia are RMR (ramina‐manganese‐red) ceramics. A comparison between the chemical and mineralogical compositions of good‐quality ceramic objects and those of waste products indicated local production of the ceramics. A sharp distinction was found in the chemical composition of the coatings: the Altilia products have tin‐opacified lead glazes, while the Terravecchia ones have transparent high‐lead glazes. Among the Altilia products, the unsuccessful process that produced a large quantity of discarded materials was attributed to the high lead content of the glazes. In fact, the principal advantage of the high lead content was to make the preparation and application of the glaze suspension easier, but the risk of reduction of lead oxide to metallic lead was greatly increased. Using micro‐Raman spectroscopy, the following minerals were identified as pigments: pyrolusite for the dark colour, malachite for green, lepidocrocite for yellow and hematite for red.     

从和平外交到革命外交——20世纪50年代中后期我国外交战略大转变国际原因探析

20世纪50年代中后期,我国外交战略经历了一个从“和平外交”到“革命外交”的大转变。促使这种大转变发生的原因是复杂的、多元的,其中国际因素占有重要地位。本文对此进行分析、归纳与研究,以就教于方家。     

The roots to peace in the Democratic Republic of Congo: conservation as a platform for green development

The Democratic Republic of Congo (DRC) is endowed with an abundance of natural resources, and the presence of high‐value resources such as coltan and diamonds is well known. The country is also endowed with a wealth of biodiversity, although the value of this is often overlooked. This article describes the detrimental impact of armed conflict on this biodiversity and the dangers posed by the return of peace, which is likely to result in increased biodiversity exploitation. The resulting loss of key carbon sinks crucial to the global fight against climate change will affect not only the DRC, but also the international community. Biodiversity is therefore identified as a threat to security but also a valuable asset for development, and this article discusses methods to realize the value of biodiversity in the DRC through the benefits of ecosystem services and income generated from monetizing biodiversity. It concludes by arguing that the false dichotomy of conservation and development as separate entities and objectives needs to change so that conservation becomes a central pillar of security and development work in the DRC and other regions of current or recent armed conflict around the world.     

The application of 3D‐microprofilometry as a tool in the surface diagnosis of fossil and sub‐fossil vertebrate hard tissue. An example from the Pliocene Upper Laetolil Beds,Tanzania

Non‐contact optical 3D‐profiling instruments are often used in the study of surface modifications on fossil mammalian bone. The advantage of optical laser scanning for the study of fossil and sub‐fossil bone is its non‐contact nature, allowing the investigation of fragile and poorly preserved surfaces. The high resolution and fast measuring rate of this method make it an alternative to scanning electron microscopy (SEM) investigation if topography is to be visualized. This study analyses clusters of incisions in a suid humeral fragment from the Pliocene Upper Laetolil Beds. The marks show a characteristic crest structure that is also frequently found in mandible marks produced by the Australian termite species Mastotermes darwiniensis. The marks from the Laetolil Beds are, therefore, interpreted as also being caused by insect mandible action. An as yet unknown large insect species capable of modifying bone with their mandibles is thus postulated in the palaeohabitat represented by the hominid‐bearing Upper Laetolil Beds. Copyright © 2001 John Wiley & Sons, Ltd.     

五代北宋高邮秦氏家族世系研究——以江苏扬州发现秦咏夫妇墓志为线索

扬州发现两合石质墓志,其主人北宋秦咏及其夫人朱氏,应系北宋著名文士秦观之祖父母。秦氏祖茔江都西山,即今西湖镇蜀岗村吕庄组七仙墩一带。通过对历史文献资料的梳理,可以对秦氏家族世系展开进一步考察,纠正秦氏家族部分成员在古代文献流传过程中出现的错误名讳记载,部分成员应因避讳等原因存在更改名字的现象;还可厘清包括秦咏及孙男秦观在内的秦氏十代家族世系,以及主要成员的生平事迹。     

The UNESCO Convention on the Diversity of Cultural Expressions as a coordination framework to promote regulatory coherence in the creative economy

The present article aims to inquire about business convergence in creative industries from the perspective of cultural diversity. It is based on the premise that the recognition of the creative and innovative component of the so-called ‘creative industries’ or the ‘creative economy’ confirms the need for non-economic factors and particularly cultural concerns to be taken into account in regulatory efforts addressing those industries. It examines the way new technologies and business convergence may affect the ‘trade and culture debate’ vis-à-vis the World Trade Organization (WTO), and how the 2005 UNESCO Convention on the Protection and Promotion of the Diversity of Cultural Expressions (CDCE) may respond in a relevant manner to challenges brought therefrom. Despite its weakly binding language, the CDCE contains principles, objectives and rules that set a comprehensive framework for policy ‘related to the protection and promotion of the diversity of cultural expressions’ at the national, regional and international levels. A fundamental piece in such an approach is the explicit integration of cultural concerns into the concept of sustainable development. This article argues that the material and economic perspective adopted in the CDCE, based on the production and consumption of cultural goods and services, remains relevant and pertinent in the creative economy, despite business convergence. By prioritizing policy and regulatory coordination, it maintains that the main elements enshrined in the CDCE should be employed to contribute to greater coherence in view of the objective of promoting cultural diversity, including vis-à-vis the WTO and other international organizations, and puts forward potential paths for such coordination.     

Consumption of Chinese goods in southwestern Europe: a multi-relational database and the vicarious consumption theory as alternative model to the industrious revolution (eighteenth century)

This article discusses the application of new technologies, software coding and computer analysis in the social sciences and humanities, mainly in the field of economic history. In the last two decades, the use of new computer technologies among historians to develop theories and solve questions has fostered a vibrant historiographical debate. However, these new digital tools have largely been used as an end in themselves, rather than as a means to develop hypotheses and answer questions. This has prevented researchers from fully exploiting such technologies in their field. In this article, I discuss how I designed a new multi-relational database using the “Access” package and SQL language to test the “industrious revolution” hypothesis and present the “vicarious consumption” theory as an alternative model for analyzing the eighteenth-century circulation of Chinese goods in the Western Mediterranean region. It presents the cross-referencing method I used to analyze the historical information I collected, mainly from probate inventories and trade records. This method makes it possible to navigate through the data in a way that goes beyond the traditional use of “excel” tables.     

The integration of geography in a curriculum focused to internationalization: an interdisciplinary liberal arts perspective from the Netherlands

Internationalization has been an important concept in higher education over the past two decades. The way that internationalization is manifest has consequences to academic disciplines, including geography. A new system of liberal arts colleges in the Netherlands has created opportunities for interdisciplinary education, representing a departure from the traditional model of European higher education. At Leiden University College the focus on global challenges created an opportunity for geography to be integrated into a diverse interdisciplinary and international curriculum. The positioning of geography into the curriculum, however, occurred because its adaptability and breadth, which enabled it to be incorporated into diverse facets of the overall teaching programme. To be successful, however, geographers should be cognizant of specific facets of the discipline suited for an international context. The case study herein reviewed highlights important differences between the U.S. and Dutch (European) context. Additionally, important points for academic geographers (academics) who are in interdisciplinary programmes (i.e. not a geography department) are emphasized, which relates to the development of course materials to suit an international context. The identification of key thematic and methodological disciplinary strands serves as bridges to interdisciplinary opportunities, which was essential to geography’s successful establishment within an international curriculum.     

关于古代气候研究的几点思考——以《黄淮海平原北宋至元中叶的气候冷暖状况》为例

关于古代中国气候方面的研究成果颇丰 ,但方法上仍有不尽人意之处。梅花、柑橘等与人类行为密切相关的生物物种 ,被过分强调 ,而特殊小气候下的个别现象往往被放大为普通规律。相反 ,对雨雪霜等物理现象关注不足。经常有意无意地以冬季温度来代表全年温度 ,而忽略了其他三个季节 ;对史料的理解过于片面 ,在作气候对比时出现标准的游移变换 ,论据与结论之间缺乏严密的逻辑必然性 ,运用理论时亦有随心所欲之处。这些似乎可以归结为“以论带史”所致     

"海丝"主题展览的跨文化叙事策略探究 ——以"在最遥远的地方寻找故乡:13—16世纪中国与意大利的跨文化交流"为考察中心

近十年来,"海上丝绸之路"主题展览成为热点.2018年湖南省博物馆举办的展览"在遥远的地方寻找故乡:13—16世纪中国与意大利的跨文化交流"体现出鲜明的跨文化诠释叙事策略.该展以"海丝"文化的两端中国和意大利作为叙事共同主体,形成双向叙事维度,通过还原跨文化生成的过程,凸显了展览的叙事动态节奏,实现展览主题与结构的内在统一,带来了跨学科视野下的叙事方法论创新.这是博物馆语境下聚焦"海丝"文化命题作出的有意义探索,为解决当下"海丝"展览同质化现象提供了启示性经验,对引领"海丝"主题展览叙事的多元走向具有开创意义.