油(气)田储量技术经济综合评价理论与方法研究

本文从界定油(气)田(藏)储量技术经济综合评价的概念入手,阐述了综合评价的必要性和当前存在的问题;分析了油(气)勘探开发的特点,明确了综合评价在技术经济评价中的重要作用;针对综合评价要求实现定量评价指标与定性描述的有机结合,文章列举了当前综合评价普遍存在的问题为:指标选取不全面、指标权重的确定不够客观,从而形成综合评价的结果的简单无力,不足以作为决策的有力依据等;据此,文章提出构造综合评价指标体系,用层次分析法(AHP 法)确定指标权重的方法.再者,由于油(气)开发决策是模糊决策,因而本文运用模糊集合理论建立油(气)田(藏)储量技术经济综合评价的多层次、多算子二型模糊数学综合评价模型,并通过实例证明该方法的计算方便可靠,符合客观实际。     

发展中国家外汇储备激增的原因和对策

发展中国家外汇储备激增,其规模大大超过了一般要求水准。发展中国家储备激增的原因在于经济发展、危机预防需求增长和外汇管理政策的变动。发展中国家储备激增对本国经济和世界经济产生了多方面的影响。防范外汇储备激增带来的风险可采取改善汇率和外汇管理政策,增加外债偿付以及利用储备对国内金融机构重资本化等方式。     

对我国上市公司计提无形资产减值准备的实证分析

通过对2001-2003年上市公司计提无形资产减值准备的实证研究,分析了我国上市公司计提减值准备的具体情况,尤其是在会计政策变更当年准备的计提情况和以后年度的表现,发现上市公司有利用无形资产减值准备进行盈余管理的动机,并指出了无形资产减值准备今后应规范的问题.     

Do we really care about Biodiversity?

This paper addresses from an economic perspective the issue of global biodiversity conservation. It challenges the perception that the world really cares a great deal about biodiversity and is prepared to pay the full cost of maintaining this stock of natural capital. Despite the existence of a plethora of international agreements there still seems to be a global ‘deficit of care’ surrounding efforts to combat challenges such as those posed by global warming and biodiversity conservation. More light can be thrown on the degree of care by measuring both the actual expenditures and the stated willingness to pay for biodiversity conservation. However, actual expenditures are much lower than willingness to pay estimates recorded in the published literature. Using the criteria that the ‘right’ amount of conservation effort is one where the marginal economic benefits from conservation just equal the marginal costs of conservation, the paper explores the biodiversity conservation conundrum and concluded that, on the available evidence, the world does not care too much about this natural capital stock and bequests to future generations. An erratum to this article can be found at     

Socioeconomic predictors of forest use values in the Peruvian Amazon: A potential tool for biodiversity conservation

Conservation is a crisis discipline requiring rapid action with limited funds. This study examines the potential of socioeconomic variables to predict forest use values. If natural resource use can be predicted from socioeconomic data, conservation planners could rapidly identify and focus conservation programs on the sectors of local populations that most intensively utilize local flora and fauna. Families in three communities in the northern Peruvian Amazon were surveyed over a 6-month period. Data were collected on use of flora and fauna from six locally determined use categories (food, medicine and poisons, wood, weavings, adornments, and “other”) in forest types of three age classes (fallow fields—very young forests, young secondary forests, and old secondary forests). Forest use values were the dependant variables calculated in $/ha/year. Socioeconomic variables included: age, education, family size, residence time, land worked, land owned, number of fishing nets, chickens, pigs, cows, and/or mules owned (all proxies for productive assets), and level of ecological knowledge (ability of informants to correctly identify forest species and answer basic questions about their biology). Ordinary least square multiple regressions were run independently for each forest type. Regressions were also run separately for the two most valuable use categories, food and wood. Low R² adjusted values (all < 0.3) reflect the difficulty in predicting human behavior due to confounding variables and complex interactions. Residence time and a household's community of residence were the most significant predictors of forest use values. Households in Vista Alegre, the community with the highest density of people and smallest landholdings per household, extracted the highest value of forest products per hectare. The longer a family stayed in any community the higher the value of forest goods they extracted. If families that lived in an area longest are the most intensive extractors of forest products, they should be a major focus for conservation programming. In addition, the higher value of products extracted from forests by some families may make them more open to strategies seeking to protect long-term viability of the resources they utilize. The importance of residence time also indicates that planners need to account for changes in the resource use patterns of stakeholders over time.     

生态旅游对生物圈保护区的影响分析

本文从生态经济学角度分析了生态旅游对生物圈保护区的促进作用和负效应，并初步探讨了生物圈保护区生态旅游管理的对策。     

Integrating ecosystem services into conservation assessments: A review

A call has been made for conservation planners to include ecosystem services into their assessments of conservation priority areas. The need to develop an integrated approach to meeting different conservation objectives and a shift in focus towards human wellbeing are some of the motivations behind this call. There is currently no widely accepted approach to planning for ecosystem services. This study contributes towards the development of this approach through a review of conservation assessments and the extent to which they include ecosystem services. Of the 476 conservation assessments identified by a set of search terms on the Web of Science, 100 were randomly selected for this review. Of these only seven had included ecosystem services, while another 13 had referred to ecosystem services as a rationale for conservation without including them in the assessment. The majority of assessments were based on biodiversity pattern data while 19 used data on ecological processes. A total of 11 of these 19 assessments used processes, which could be linked to services. Ecosystem services have witnessed an increase in attention received in conservation assessments since the year 2000, however trends were not apparent beyond this date. In order to assess which types of ecosystem services and how they have been accounted for in conservation assessments, we extended our review to include an additional nine conservation assessments which included ecosystem services. The majority included cultural ecosystem services, followed by regulatory, provisioning and supporting services respectively. We conclude with an analysis of the constraints and opportunities for the integration of ecosystem services into conservation assessments and highlight the urgent need for an appropriate framework for planning for ecosystem services.     

Bioenergy Crop Production in the United States: Potential Quantities, Land Use Changes, and Economic Impacts on the Agricultural Sector

The U.S. Departments of Agriculture and Energyjointly analyzed the economic potential for,and impacts of, large-scale bioenergy cropproduction in the United States. Anagricultural sector model (POLYSYS) wasmodified to include three potential bioenergycrops (switchgrass, hybrid poplar, and willow). At farmgate prices of US $2.44/GJ, anestimated 17 million hectares of bioenergycrops, annually yielding 171 million dry Mg ofbiomass, could potentially be produced at aprofit greater than existing agricultural usesfor the land. The estimate assumes highproductivity management practices are permittedon Conservation Reserve Program lands. Traditional crops prices are estimated toincrease 9 to 14 percent above baseline pricesand farm income increases annually by US $6.0billion above baseline.At farmgate prices of US $1.83/GJ, anestimated 7.9 million hectares of bioenergycrops, annually yielding 55 million dry Mg ofbiomass, could potentially be produced at aprofit greater than existing agricultural usesfor the land. The estimate assumes managementpractices intended to achieve highenvironmental benefits on Conservation ReserveProgram lands. Traditional crops prices areestimated to increase 4 to 9 percent abovebaseline prices and farm income increasesannually by US $2.8 billion above baseline.     

浅议我国最佳外汇储备规模

截止到2005年12月底，我国的外汇储备已达到8000亿美元，关于其数额是多是少的争论进行得如火如荼。本文对充足外汇储备给我国经济和社会带来的有利之处进行了理论上的分析后．又采取数学方法对我国2004年最佳的外汇储备数额进行了测算．得出了一个结论：我国的外汇储备并不多。然后，在此基础上对我国外汇储备的管理提出了几点建议。     

现代企业集团物资储备资金管理中的问题与对策

以国有大型企业重庆建设工业集团有限责任公司为例，对现代企业集团中储备资金管理存在的问题和对策进行了探讨。提出企业应加强储备资金管理，加速流动资金周转，完善自身管理，促进其经济效益的提高。