Iron knees in wooden vessels—an attempt at a typology

Knees were brackets in the structure of a wooden ship. They were introduced in the second half of the 18th century and were in common use for naval and merchant ships in the 19th century. They were fashioned in various designs. A typology of these is proposed based on archaeological and documentary evidence. Iron knees could used to assist the dating of unidentified shipwrecks.     

Analysis of hull remains of the Dor D Vessel, Tantura Lagoon, Israel

A relatively closely spaced set of unpegged mortise-and-tenon joints was the significant element revealed in the 7th-century AD shipwreck, Dor D. It provides additional information for the transitional period of shipbuilding in the Mediterranean, and together with additional wrecks it establishes a better database for ship construction in the 4th–11th centuries AD. The preliminary conclusions tend to draw a slightly more complicated picture of the general evolutionary trend, since they present some features that have traditionally been considered as a disappearing technique.     

Origin of deep saline groundwaters in the Vienne granitic rocks (France): constraints inferred from boron and strontium isotopes

As part of a preliminary geological characterization programme to assess the feasibility of an underground laboratory in granitic rock, a series of 17 deep boreholes (maximum depth, 900 m) was drilled by ANDRA in the Vienne district, France. A salinity gradient was demonstrated in the granitic waters with concentrations varying from approximately 1 g L^?1 at 150 m depth at the top of the basement (beneath the sedimentary cover) to 10 g L^?1 in the deeper part (from 400 to 600 m depth). Sr and B isotope ratios were measured in order to better understand the origin of the salinity and to evaluate the degree of water–rock interaction in the system. The results obtained were compared to those of mineral spring waters emerging from the granitic basement in the Massif Central. Evidence in support of a significant marine contribution include: (i) the Cl–Br investigations agree with a marine origin for the saline groundwaters without evolution from seawater; (ii) the ⁸⁷Sr/⁸⁶Sr ratio of the Vienne deep groundwaters (0.7078–0.7084) is in agreement with a palaeo‐seawater isotopic signature; (iii) measured δ¹¹B values for the deepest brine samples are enriched in ¹¹B (up to 36.1‰) relative to the granitic springs. The combined use of δ¹¹B, Cl, B, Br, Sr contents and ⁸⁷Sr/⁸⁶Sr ratios makes it possible to define and quantify a mixing model between marine and crustal end‐members in order to explain the origin of the deep saline groundwaters in the Vienne granitic rocks.     

深圳发展会展旅游的探析

会展旅游已成为当今世界旅游业发展的一个重要方向。它不仅可以促进城市经济发展,而且能够提升城市国内、国际形象,是城市旅游业发展的重要方式。本文论述了深圳发展会展旅游的优越条件和存在的问题,并提出几点建议和对策。     

发达国家和发展中国家不同的贸易地位引发的贸易与环境问题分析

本文在对发达国家和发展中国家的贸易环境观进行比较分析的基础上,指出绿色贸易壁垒是发达国家在贸易活动中进行环境保护的主要手段。发达国家的贸易环境保护引发了一系列的环境问题,而发展中国家却遭受了许多不平等待遇。发展中国家应采取积极措施,协调贸易与环境保护问题。     

人地关系理论新探——区域政治、经济、社会系统观

人地关系理论是人文地理学的核心理论。由于人类和自然地理系统间的关系处于不断的变化之中,因而人地关系理论也处于不断变化与发展、完善之中。从而使无数学者为之不断探究。本文在人文地理学基本理论基础上,提出人地之间的"平台系统"观点,以此作为笔者对人地关系探究活动的一次参与。     

试论城镇群体空间的组织调控

在工业化、后工业化的催动及交通、信息条件的支撑下,城镇群体化发展已经成为全球化的现象。文章介绍了西方国家城镇群体空间的典型调控模式,分析了市场力量与规划调节力量在其空间组织调控中的作用,并提出城镇群体空间的组织调控是一个准市场行为的观念,以期对中国的相应研究与实践提供一定的借鉴。     

我国区域经济地理学科的创新与发展

本文认为随着世界政治经济格局的深刻变化和世界经济一体化、区域集团化的飞速发展,区域经济地理学作为我国地理科学中的一门年轻学科,正处于深刻的变革之中。在新的21世纪中,学科发展面临着重大挑战,同时也面临着发展的重要机遇,要实现学科的创新与发展,关键在于如何深刻认识与处理学科发展面临的相关学科的挑战、继承与创新、理论与实践相结合等几个重大问题。最后,本文提出了区域经济地理学科的四个发展趋势。     

宁夏伊斯兰教地理的初步研究

中国伊斯兰教地理的研究相对空白。本文以宁夏回族自治区为例,阐述了伊斯兰教徒、宗教景观、社区类型和教派及其门宦的地域性特征,伊斯兰区域主导文化与区域社会经济发展的关系。本文希望对伊斯兰教地理的研究起到抛砖引玉的作用,对于制定以伊斯兰文化为主导的区域发展战略和政策起到参考作用。     

珠江三角洲中小城市的城市化研究

本文通过对中小城市在珠江三角洲城市化进程中的发展地位、发展特点、城市化形成机制以及珠江三角洲未来发展环境等方面进行分析,得出:①中小城市的发展完善了珠江三角洲的城镇体系;②中小城市对城市化水平的贡献率远远大于大城市;③未来城市发展的动力机制将更趋多样性,将会出现更加理想的城市化空间发展模式。另外,针对珠江三角洲未来中小城市的发展,本文提出了相应的对策。