中国史前时代历史分期及其农业特征

中国史前时代处于更新世晚期到全新世早期,距今18000年到4000年,历时约14000年。据考古资料和历史传说,中国史前时代凝集为三皇史系,可分为4个时期:燧巢时期、羲娲时期、神农时期和黄帝时期,它们各有鲜明的农业特征。燧巢时期的表征事件是可控用火与营造居所,农业发生的准备期;羲娲时期,华夏族群的创世纪,由采集渔猎转变为主动放牧,构建了草地—畜群—人群和谐相处格局;神农时期农耕、麻织和陶器广泛使用,出现农业发展高潮,农耕文明渐具雏形;黄帝时期在历史累积之上,与周围族群多次融合发展,华夏民族形成,农业生产达到全新水平,龙凤图腾诞生,中华文明奠基。华夏农业文明简要脉络应为:农业的发轫应自羲娲始;农业中的种植业发展应自神农始;华夏农业文明的整体构建和奠基应自黄帝始。     

发展海洋经济促进天津市经济高质量发展的若干建议

海洋是高质量发展战略要地。大力发展海洋经济是培育经济新动能、促进我国经济迈向高质量发展的重要路径。海洋区位与资源是天津最大的先天优势和资源禀赋，面对速度下滑、结构偏重偏旧的经济状况，天津应依托全国海洋经济发展试点地区、海洋经济创新发展示范城市、海洋经济发展示范区等国家级战略平台，从战略高度重视海洋经济，不断深化海洋强市发展战略；以海水资源利用、高端海洋工程装备、北方航运中心等为重点加快海洋产业集聚，培育经济新动能，并通过强化产业政策支持，为海洋经济发展营造良好发展环境。     

Regional integration and maritime connectivity across the Maghreb seaport system

Models and empirical studies of port system evolution dominantly focus on land-based dynamics. Hence, it is traditionally recognized that such dynamics condition the evolution of ports and their relations as well as wider regional integration processes. The Maghreb region (Algeria, Morocco, and Tunisia), which is currently responsible for no less than one-third of all African port throughputs, offers a fertile ground to test the possibility for regional integration to occur through maritime linkages despite limited trade integration and land-based transport connectivity. Main results highlight the increase of trans-Maghreb maritime connectivity but this occurs mostly at the periphery of the system based on transit flows. Logistical integration versus trade integration is discussed in light of the recent evolution of Maghreb ports and of the region in general.     

Politics and sustainable tourism development – Can they co-exist? Voices from North Cyprus

This paper investigates ways in which political obstacles inhibit the formulation and implementation of sustainable tourism development in small-island developing states through the example of North Cyprus. The methodology draws on in-depth interviews and participant observation of significant actors in the tourism sector. The research findings suggest that understanding the intricate political system and power structure in a society is the key to understanding sustainable tourism policy development, planning and implementation. In the case of North Cyprus, policy development was found to be a product of political influence (referred to as ego-driven politics in the text), specifically the use of public resources as an instrument for political power, retention and that the politicisation of the public sector is the underlying cause of the weakened progress in sustainable tourism development. It is therefore essential to have a clear understanding of political issues, key political actors’ interests and how to mitigate personal interests to facilitate and maintain sustainable tourism development in such small states.     

海参功能特性及其食品研究的总结

海参一直是"海八珍"之首,具有丰富的营养成分和保健功能。本文主要介绍海参免疫、降血压、抗疲劳、抗肿瘤、延缓衰老等功能的研究情况,并介绍当前几种新型海参食品。最后,还指出当前海参深加工所存在的问题,并给出了展望。     

The Effects of NAFTA on Trade and Welfare in the U.S. Fresh Tomato Industry

Abstract

The purpose of this study was to measure NAFTA's impact to date and quantify how the producers and consumers of fresh tomatoes in the United States, Canada and Mexico have benefited or lost. Changes in consumer and producer surpluses were calculated in 2001 US dollars based on simulations of two scenarios. The analysis found that U.S. consumers captured $12.1 billion more surplus than they would have captured had NAFTA not been enacted. Mexican fresh tomato producers gained an additional $2.08 billion in surplus due to NAFTA. In contrast to Mexican growers, U.S. and Canadian producers appear not to have benefited economically from NAFTA. Findings suggest that U.S. producers would have earned $3.29 billion more if NAFTA had not gone into effect. Canadian producer surplus with NAFTA was estimated to be approximately $20 million less with NAFTA, and the total net benefit from NAFTA was found to be a positive $10.87 billion.     

Compounding food and income insecurity in Yemen: Challenges from climate change

This paper provides a model-based assessment of local and global climate change impacts for the case of Yemen, focusing on agricultural production, household incomes and food security. Global climate change is mainly transmitted through rising world food prices. Our simulation results suggest that climate change induced price increases for food will raise agricultural GDP while decreasing real household incomes and food security. Rural non-farm households are hit hardest as they tend to be net food consumers with high food budget shares, but farm households also experience real income losses given that many of them are net buyers of food. The impacts of local climate change are less clear given the ambiguous predictions of global climate models (GCMs) with respect to future rainfall patterns in Yemen. Local climate change impacts manifest itself in long term yield changes, which differ between two alternative climate scenarios considered. Under the MIR scenario, agricultural GDP is somewhat higher than with perfect mitigation and rural incomes rise due to higher yields and lower prices for sorghum and millet. Under the CSI scenario, positive and negative yield changes cancel each other out. As a result, agricultural GDP and household incomes hardly change compared to perfect mitigation.     

浅议河南省绿色会计的构建

河南省经济迅速发展的同时,环境资源的不足现象也越来越严重。为了提高人们合理有效使用资源的意识,实现河南省的可持续发展战略,文章仅就绿色会计的基本概念、产生的原因,我国绿色会计发展的现状及河南省绿色会计的构建等问题进行简单探讨。     

环渤海西岸城市群资源环境与经济发展综合评价

文章选取2000-2005年的相关数据，对环渤海西岸城市群的资源、环境与经济发展进行了综合评价，并找出环渤海西岸城市群可持续发展面临的主要问题：水资源严重短缺，自然资源危机严重；第三产业滞后，经济发展潜力不足；环境污染依然存在，污染控制力度有待加强。