Refuge‐Effect Hypothesis and the Demise of the Dodo

The Dodo was last sighted on the inshore island of Ile d'Ambre in 1662, nearly 25 years after the previous sighting on the mainland of Mauritius. It has been suggested that its survival on the inshore island is representative of the refuge effect. Understanding what constitutes significant persistence is fundamental to conservation. I tested the refuge‐effect hypothesis for the persistence of the Dodo (Raphus cucullatus) on an inshore island beyond that of the mainland population. For a location to be considered a refuge, most current definitions suggest that both spatial and temporal isolation from the cause of disturbance are required. These results suggest the island was not a refuge for the Dodo because the sighting in 1662 was not temporally isolated from that of the mainland sightings. Furthermore, with only approximately 350 m separating Ile d'Ambre from the mainland of Mauritius, it is unlikely this population of Dodos was spatially isolated. Hipótesis del Efecto Refugio y la Desaparición del Dodo     

论新经济环境下成本会计的职能

新经济环境下成本会计职能的发挥是每个组织中的管理者所关注的重要课题，本文通过新经济环境对成本会计的挑战及管理理论与方法创新对成本会计影响的分析，提出新经济环境中发挥成本会计职能应采取的对策．     

双出口疏散吸引区域模型建立与模拟分析

为研究建筑体内人员疏散的出口选择行为,提出基于元胞自动机的人员疏散模型。以学校常见的双出口教室为例进行研究,建立双出口疏散吸引区域模型,得出人员密度较低和较高时疏散吸引区域边界的函数表达式,指出人员密度较高时,边界函数基本满足边界到出口距离的平方之比等于出口的宽度之比;通过对出口宽度、人员数量和出口位置等参量进行仿真分析,充分验证了提出的双出口疏散吸引区域模型的合理性;研究结果有助于合理分配疏散人员,充分发挥建筑疏散的潜在能力。     

浅论经济发展和环境保护的相关性——沈阳市"十五"期间经济发展与环境保护的相互促进

经济发展和环境保护的矛盾历来是被各界学者和环境管理者所关注,经济的高速发展给中国带来了严峻的环境形势,沈阳市"十五"期间依靠城市工业布局和产业结构大调,使整体经济发展和环境保护得到相互促进,证明了环境保护与经济发展并不是相互对立的,而是完全可以和谐发展、相互促进.     

Regional Study on Economical Supporting Capacity of Land Resources in Shandong Province

Taking the land resources of 17 cities in Shandong Province as the basic data, the article studied on the economical supporting capacity of land resources in terms of the effect of land on economy. The author classified 17 cities of Shandong Province into four types according to the economical supporting capacity of land resources by quantitatively estimating the evaluation indices of the total amount of land resources, the potential of urban and other nonagricultural land, and the integrated economical sup- porting capacity of land resources, etc. The author proposes the questions requiring further study at the end of this article.     

Regional Study on Economical Supporting Capacity of Land Resources in Shandong Province

Abstract

Taking the land resources of 17 cities in Shandong Province as the basic data, the article studied on the economical supporting capacity of land resources in terms of the effect of land on economy. The author classified 17 cities of Shandong Province into four types according to the economical supporting capacity of land resources by quantitatively estimating the evaluation indices of the total amount of land resources, the potential of urban and other nonagricultural land, and the integrated economical supporting capacity of land resources, etc. The author proposes the questions requiring further study at the end of this article.     

社会经济发展对鞍山市环境质量影响分析

鞍山市作为中国的老工业基地,历史遗留环境问题较多,在新的历史条件下也面临着经济发展和环境保护双重问题。文章结合“十一五”期间鞍山市经济发展和环境质量状况,分析了鞍山市城市调整和社会发展等4个方面取得的环保成果,同时也客观分析了面临的环保问题,希望能对鞍山市“十二五”社会经济发展和环境保护提供参考性的建议。     

危险性评估与经济性分析在性能化消防设计中的应用

分析了性能化消防设计中危险性评估与经济性分析的关系，以仓库火灾为例，介绍了危险性评估的思路、程序。     

Zn / Al 双金属氧化物对水中硫酸根离子的吸附性能简

研究了用Zn/Al水滑石制得的Zn/Al双金属氧化物（Zn/Al-300）吸附剂对水中硫酸根离子的吸附,考查了吸附剂投加量、初始pH等因素对硫酸根离子吸附的影响。结果表明,Zn/Al-300对水中硫酸根离子的吸附符合Langmuir吸附等温方程,理论最大吸附量为62.5 mg/g。运用动力学方程进行拟合,吸附过程符合准二级动力学方程;溶液的pH影响吸附剂对硫酸根的吸附,在pH=5.5时硫酸根的去除率最大;X射线衍射结果显示,水滑石经过焙烧后丧失了原有的构形,并在吸附硫酸根离子后重新恢复水滑石的部分层状结构。吸附机制主要为Zn/Al-300从溶液中获取阴离子以重建水滑石的晶体结构,即“记忆效应”。对吸附后的双金属氧化循环应用4此后,吸附容量几乎不变,说明双金属氧化物具有可循环型。通过将Zn/Al-300与其他几种吸附剂的经济性分析,表明此吸附剂在使用过程中具有一定优势。     

城市公园建设项目综合费-效分析的灰色评价

城市公益性建设项目是国家投资,不以盈利为目的基本建设,因此此类工程项目的经济评价一直不被重视,而且缺乏适当的评价指标和方法。文章综合考虑费用-效益、费用-效果评价、城市竞争力效果评价和社会效果评价的因素,运用定性指标和定量指标相结合的分析方法,建立综合评价指标体系,并用灰色聚类决策方法进行评价和探讨。用灰色评价和层次分析相耦合的方法对益阳市梓山湖生态公园建设项目进行具体评价。