A simple theoretical model for computing omega navigation errors near Antarctica

The propagation of VLF signals around a model icecap has been computed using Kirchhoff diffraction theory. The Antarctic continent has been modelled as a spherical cap, whose pole is coincident with that of the South Pole, which totally absorbs VLF radio waves propagating over it. Using this simple model, the range errors expected, whilst travelling between Antarctica and New Zealand, on signals from Omega La Reunion and Argentina have been calculated and compared with recently derived measurements. It has been found that in order to model the measured range errors accurately it has been necessary to modify the simple spherical cap model to that of a semi-circular spherical cap, producing what is effectively knife edge diffraction. To ‘best fit’ the data, the northernmost limit of the spherical cap has been found to be 66.1°S for propagation from La Reunion and 75°S for propagation from Argentina. These model icecaps agree well with the northernmost boundary of the Antarctic continent where signals from Omega La Reunion and Argentina graze it tangentially.     

转型期中国城市网络空间结构演变——基于商业银行分支机构网络的视角

21世纪以来,城市网络研究成为全球和区域城市体系研究关注的焦点,但当前对国家层面城市网络空间结构演变的研究还较少涉及。基于2001—2016年间中国商业银行网点空间分布变化数据,运用社会网络分析方法,对中国城市网络空间结构的时空演变特征进行了研究。研究结果显示：中国城市网络结构由等级化向网络化转变,具体表现为在轴辐结构基础上向连通性更强的链锁网络演进;与此同时,城市网络同时呈现少数城市网络连接度的极化以及多中心扩散的特征。区域层面,东部沿海地区,特别是长三角、京津冀和珠三角三大区域的城市网络发展较为完善,与其它区域的差距持续拉大,但山东、东北和福建等省份与区域内外的联系增长也较快。大多数城市的出度和入度差异明显,但这一差异正在逐渐缩小。     

THE APPLICATION OF INSTRUMENTAL NEUTRON ACTIVATION ANALYSIS TO A STUDY OF PREHISTORIC STEATITE ARTIFACTS AND SOURCE MATERIALS

A study of the trace and minor element content of steatite artifacts from the Eastern United States has been carried out. Samples from both quarry and habitation sites ranging from New York to North Carolina have been analyzed through the use of instrumental neutron activation analysis. The most successful method of evaluating data has involved the study of a very coherent group of elements known as the Rare Earths. Geological processes cause fractionation of this group and it is this fractionation which is of use in terms of characterizing the source deposits of this material. Promising but less definitive results have been obtained with the elements scandium, chromium, cobalt and others. Sufficient variations have been found to be present in the source deposits of steatite in this area to enable differentiation, and the successful linking of samples from habitation sites to their quarry deposits has been achieved in some cases. This paper discusses the results of this study to date, the methods employed, and the potential value of this work in helping to reconstruct prehistoric trading systems.     

6. SPACE: A USELESS CATEGORY FOR HISTORICAL ANALYSIS?

Much fuss has been made of the “spatial turn” in recent years, across a range of disciplines. It is hard to know if the attention has been warranted. A confusion of terms has been used—such as space, place, spatiality, location—and each has signified a cluster of often contradictory and confusing meanings. This phenomenon is common to a range of disciplines in the humanities. This means, first, that it is not always easy to recognize what (if anything) is being discussed under the rubric of space, and second, that over‐extended uses of the cultural turn have stymied meaningful engagement with (or even a language of) materiality in discussions of space. This article shows how materiality has been marginalized both by a casual vocabulary and a vigorous a priori epistemological holism on the part of scholars, and how the spatial turn has been too closely linked to the cultural turn to allow it to develop its fullest explanatory potential. It demonstrates how historians might profitably theorize the significance of place and space in their work (borrowing techniques from geographers and anthropologists, and referring to the phenomenological tradition), and sets out some challenges for using space more effectively in explanatory systems. Inspired by environmental history, sociology, and science and technology studies, I propose a way of establishing space as different from conventional historical handling of materiality, and end by identifying some methodological problems that need to be solved if we are to proceed on a surer footing.     

The Mesolithic of Southern Scandinavia

The Mesolithic of Southern Scandinavia, with comprises Denmark and Southern Sweden, has been an attractive area for research for several reasons, including the good preservation conditions at many sites. Most of the work has been concentrated on the southwestern part of Southern Scandinavia, but results from more recent investigations mean that other areas can also be analyzed. New finds in the last few years have given us a greater understanding of the Late Paleolithic settlement and of its relation of the Mesolithic. For the Early Mesolithic (10,000–8000 B.P.), interest has focused primarily on the small inland bog sites in the southern part of the area, where the coast has since been submerged. Farther north, where the land has been uplifted, evidence of coastal settlement has been documented. The Late Mesolithic (8000–6000 B.P.) is known chiefly on the basis of its large coastal settlements. In this period, there is also a larger and more varied collection of finds, which makes it possible to discern clear regional differences. There has also been considerable research on the transition from Mesolithic to Neolithic.     

The Intellectual Internment of a Conflict: The Forgotten War in Northern Ireland

One of the most enduring ideas about the Northern Ireland conflict is that it has been rigorously studied. This is a myth. The stark absence of analysis of its military and international dimensions makes the conflict one of the least understood of modern times. Scholarly studies of Northern Ireland have been insulated from influences in the wider academic world by the dominance of hitherto unchallenged images about the crisis. These images support a dominant orthodoxy that has confined intellectual investigation of the 'Troubles' to Northern Ireland itself, sustaining a view that little of value can be gained from studying the military nature of the conflict. This orthodoxy is one to which, depressingly, the international relations community has been only too willing to contribute to justify its fear and neglect. Not only does this reflect poorly on academic practice but it has also helped to engender a dangerously distorted image of the conflict that bodes ill for the future.     

Dating problems in Icelandic archaeology

For many decades tephrochronology has been used as a scientific method for dating archaeological as well as geological remains in Iceland. Recently, parts of the tephrochronology for the eruptions of the famous volcano Hekla have been questioned by the author. This is due to obvious differences in dating results of archaeological artefacts from the valley of Thjórsárdalur in southern Iceland and the current tephrochronological dating of its devastation. While the devastation of the valley has been dated to AD 1104 and is thought to have been caused by a huge eruption of mount Hekla in that year, the artefacts from excavations and stray finds, as well as new ¹⁴C results, show somewhat later 12th‐13th century dates. The paper deals with this obvious discrepancy, which has hitherto been ignored, together with the results of archaeological excavations in 1983–86 at Stóng in Thjórsárdalur; it also gives a critical analysis of the historical methodology of the tephrochronologists.     

The Battle of Cheriton: the analysis of artefacts from an English Civil War Battlefield

The Battle of Cheriton in 1644, one of many English Civil War battles, was a major turning point in the war. The battle has not been studied in detail, but the battlefield has been subject to extensive amateur metal detecting. Until now, only a very small percentage of the Cheriton battlefield assemblage has been examined. This paper aims to gain a new understanding of the events of the battle by analysing the assemblage of small finds that has been collected from the battlefield site. The result of this analysis is that the true location can now be provided with some certainty, along with a better understanding of the events and range of weapons used at the battle.     

China and global oil: vulnerability and opportunity

China has grown increasingly dependent on imports of oil and, as a consequence, has become a major and very visible player in the international energy markets. For a country which has traditionally been strongly committed to the principle of self‐reliance, this dependence on foreign oil has been a source of vulnerability and anxiety. But it has also been a strategic opportunity for China to chart its own ambitions and objectives as a global economic and political actor. This article addresses the various ways in which China has incorporated its energy import needs within its foreign policy. There are, it is argued, three dimensions to this. There is, first, integration and cooperation with the West and other large oil‐importing countries and a shift away from neo‐mercantilism to a growing reliance on international markets. Second, there is a complementary strategy of balancing, which seeks to develop the energy resources close to its borders, in Russia and Central Asia, which are not so vulnerable to western intervention. And third, there is the construction, though preliminary and nascent at the moment, of a hegemonic order which challenges the US and the West in the critical maritime routes from the Pacific to the Indian Ocean and through to the Persian Gulf region.     

Firms, regions and competitiveness: a broad-brush approach

The objective of this paper is to give an account of the first step of a research programme which has recently been completed. The first step can be labeled a broad-brush approach in order to separate it from later steps. It is intended to give an explorative indication of the extent to which sectors within manufacturing industry are dependent upon regional resources for productivity and innovation to reach a level of international competitiveness, as well as identifying which resources are of importance. The aim has been to identify the conditions for the vast majority of sectors and regions, and thereafter in later steps via the residuals, to point to relations and phenomena which are not sufficiently accounted for. These deviations from the norm, have been examined using a different approach from that employed here. Part of the second step is presented very briefly at the end of the paper.     

Dilemmas in the Construction of a Socialist Law-based State in Vietnam: Electoral Integrity and Reform

Abstract

The Vietnamese party-state has been seeking to develop the concept of a socialist law-based state in an effort to provide a legal-rational justification for its rule. One of the key pillars in the construction of a socialist law-based state has been electoral governance. Unlike the popular understanding proliferated by the Western media about the meaning of elections in authoritarian countries, I argue that elections are of significance to the political life of the Vietnamese party-state even without pressure from any political opposition. This is because there is a growing need for the party-state to make the elections work more effectively to bolster its legitimacy. Along with the process of promoting the concept of a Vietnamese socialist law-based state, continuous reforms of the electoral integrity system have been considered and cautiously implemented. An important aspect of the reform is to ensure the values, purposes and duties for which power is entrusted to or held by electoral institutions are honoured. It is argued that the process of building a more integrated national system of rules and values has been set in motion but many setbacks have occurred from time to time, making it a dynamic process.     

近十五年来真实性在国内外旅游中的研究对比

旅游界对真实性研究了四十多年,尚无统一的定论。近十五年是国内外真实性研究的大发展时期,更是填补了国内真实性研究的空白。本文主要着眼于近十五年来真实性在国内外的研究,分别从理论研究、真实性与旅游保护开发、真实性与旅游经营管理、真实性与旅游发展等几个方面进行对比,总结出国内对真实性研究与国外研究的差距,得到我国未来对真实性研究的方向和启示。     

A break from the past: The labor party and the political economy of Keynesian social democracy

Arguments about the nature of the Australian Labor Party have been somewhat revived over the past few years. Those who argue that there has been a fundamental break with Labor tradition are criticised from both the right of the labour movement and the Marxist left. Both, interestingly, argue that to see the Hawke‐Keating years as too distinct is to misread history. Both schools of thought argue that those who defend a Labor tradition ‐which is fundamentally different from contemporary Labor are glorifying the past. This paper gives an account of Keynesian social democracy, and employs a comparative case study of economic debate in the 1940s and 1980s, in order to argue that there has indeed been a fundamental change in Labor's approach to political economy.     

THE SHIPMENT OF TRADED GOODS AND OF BALLAST IN ANTIQUITY

Summary. A ship's Master has to ensure that goods are loaded in such a combination, and stowed in such a manner, that his ship has a safe freeboard and adequate stability. In antiquity these considerations would have been evaluated from experience and by inherited rules of thumb, whereas today stowage factors are used. Greek decorated pottery, with a relatively high stowage factor, is most unlikely to have been used as ballast in the ancient Mediterranean, but small consignments may have been used as 'space-fillers'.     

金沙遗址出土古象牙的现场清理加固保护

成都金沙遗址出土的古象牙,保存现状十分脆弱。出土后由于失水速度加快,象牙会迅速开裂、风化,最终完全粉化。为了能将这批珍贵的象牙完好地保存下来,必须寻找一种简单的方法对象牙进行有效的保护。根据对象牙的成分分析和脱水试验研究,选择用改性的有机硅材料把象牙嵌封保存起来。对材料的保护性能进行研究的结果显示,用这种有机硅材料对出土脆弱古象牙进行嵌封保护,可以减缓象牙的失水速度,隔绝大气环境对脆弱象牙的腐蚀,又不影响直接观看,是一种安全有效的方法。     

《晋纪·总论》的史学价值

干宝《晋纪》已佚,其中二千七百多字的《总论》因历代各种文献引录完整保存至今。创设"总论"这种新的历史评论范式,摆脱《左传》、《史记》就事论事或寓论断于叙事中的历史评论方式,在更宽阔的历史视野下表达史家的历史认识,对后世历史评论的发展产生了深远影响。《总论》对西晋兴亡的历史过程及其缘由也做了深刻的分析和总结,这些历史认识对研究西晋历史发展及其过程提供了有益的启示。《晋纪·总论》在中国史学发展史上有着重要的价值和意义。     

Community Archaeology: A Threat or an Opportunity for Greek Archaeology?

The development of archaeology in Greece has been determined by the central role classical antiquity played in the European and Greek imagination. Classical archaeology, with its aesthetic view of the material culture, has dominated the discipline and its popular perception ever since. The state has been entrusted with the exclusive authority on archaeological heritage because of its national importance. This paper argues that the combination of the classical and state monopoly has led to the isolation of Greek archaeology from the world and from the Greek people. The aim is to critically assess Greek archaeology and introduce community archaeology as a means to make archaeology relevant to the Greek people.     

Analysis and interpretation of flint toolmarks found on bones from West Tump long barrow,Gloucestershire

West Tump is a Neolithic chambered tomb originally excavated in 1880. The mound was found to contain a mixed skeletal assemblage, the majority of which was disarticulated. Between 2000 and 2001 material from the site including human bone was re‐examined with a portion of this project focused on taphonomic evidence observed on the human skeletal material. Amongst the factors selected for investigation were deliberate toolmarks. Three specimens were identified as exhibiting toolmarks. Analysis demonstrated that the observed features were cutmarks, consistent with the use of flint tools. However those on two of the specimens were found to be both post‐mortem and recent. The cutmarks observed on the remaining specimen, a right clavicle, were identified as having been inflicted during the peri‐mortem period and consistent with decapitation. British Neolithic mortuary practice has been the subject of ongoing debate since the earliest excavations of relevant sites, but until very recently few assemblages from such contexts have been re‐examined and much of the data in use has derived from sources of considerable age and questionable reliability. The selective removal of specific skeletal elements (particularly skulls) has repeatedly been described in the literature regarding the collective funerary monuments of this period. It has often been assumed that such practices took place after the soft tissues had decayed. One of the examples discussed, suggests this may not always have been the case and the potential significance of this finding is discussed in addition to a possible interpretation of the cutmarks seen on the remaining specimens. Copyright © 2004 John Wiley & Sons, Ltd.     

British nuclear weapons and NATO in the Cold War and beyond

NATO has been a source of influence on British nuclear policy and strategy since the 1950s. The nature and extent of its influence has, however, been kept limited by successive British governments. This article considers how and why this has happened. It discusses evolving British attitudes towards NATO command and planning, and shows how these were reflected with regard to strategic nuclear issues from the late 1950s. The evolution of the key notion that the United Kingdom is a second centre of nuclear decision within NATO is traced, and both its utility and contradictions are examined. Overall it is argued that, both during and since the Cold War, NATO has neither been a central factor in shaping British nuclear strategy and policy, nor have British nuclear weapons been other than of limited importance and relevance for most NATO members.     

ON THE OPTIMAL LOCATION OF SENSORS IN MULTI-STOREYED BUILDINGS

A new approach has been developed for finding optimal location of sensors in 3D multi-storeyed buildings. This approach is based on the compact probabilistic representation of acceleration response in terms of its covariance matrix. For a specified number of sensors, the optimal location has been taken to be the one for which the computed covariance matrix is closest to the exact covariance matrix of the random field constituted by the acceleration response process. It has been found that the determined sensor locations match favourably with those predicted by earlier studies for the special case of shear buildings. Further, the optimality of the determined sensor locations has also been verified by identifying the system parameters from the time series data and comparing them with those of the Finite Element Model.