X射线荧光光谱法分析硅锰合金中的硅、锰、磷

对硅锰合金进行熔融制片，使用X 射线荧光光谱仪对硅锰合金进行分析，选择合适的分析条件，确定仪器最佳参数，建立校准曲线。试验证明，本方法测量结果与经典化学方法结果相吻合，且本方法分析速度快，结果准确，能够满足实际生产需要，可为相关部门提供参考。     

Análisis de portafolio por sectores mediante el uso de algoritmos genéticos: caso aplicado a la Bolsa Mexicana de Valores

The type of industry, size of company, number of employees, etc. are variables that are considered as control variables in a large number of articles. In this research we consider the sector variable as a determinant of financial performance (Baird et al. 2012) and the risk (Artikis and Nifora, 2011) rather than as a control variable. This paper analyzes six sectors of the Mexican economy divided according to the Mexican Stock Exchange: industrial, basic consumer products, materials, non basic consumer products, telecommunications and financial services. The sample consists of Mexican companies, that is, 30 companies in the 2007-2012 period. To measure portfolio performance two classic indicators are used: (1) Jensen alpha and (2) Sharpe ratio, and also conditional metrics are used that measures the number of times the portfolio return exceeds the market average. The goal is to find a portfolio that maximizes these parameters and compare the results between the different sectors under study. Due to a nonlinear programming problem, genetic algorithms are used to obtain the optimal portfolio that maximizes these metrics. The results show a better risk-adjusted financial performance in the field of materials and financial services and a lower performance in such sectors as the industrial and telecommunications ones.     

我国区域碳排放与经济增长的实证分析——以环渤海、长三角和珠三角地区为例

基于《2006年IPCC国家温室气体清单指南》中的碳排放核算方法,测算了2000-2011年环渤海、长三角和珠三角地区的CO2排放量、排放强度、人均排放量和单位面积排放量,从变动趋势、消费结构、相关性三个角度分析了三地区的碳排放和能源消费,并在此基础上提出了降低碳排放量的政策建议。     

旅游业能源需求与二氧化碳排放研究进展

人类利用能源导致温室气体排放量的持续增加是全球气候变化的直接驱动力。旅游开发、旅游活动及旅游业发展引起的温室气体排放是旅游业驱动气候变化的重要因素,同时也是发展旅游业主要的环境影响结果之一。随着旅游业的蓬勃发展,旅游业对环境和气候变化的影响被相关国际组织和社会各界所关注,旅游业能源需求与二氧化碳排放研究成为近5年来旅游研究领域的热点。国外研究综述表明,目前已识别旅游业能耗、排放的重点领域及结构;在旅游业能源消耗与二氧化碳排放的定量估算研究与情景分析方面形成初步结论。对不同类型旅游交通方式、住宿方式及旅游活动的单位能耗和排放强度等关键性参数取得一般性认识,并识别了明显的国别、地区及不同部门之间的差异。基本形成体系化的节能减排政策措施。基于国内外旅游业能源需求与二氧化碳排放的结构与途径、测算、预测与情景分析及节能减排对策与措施等方面对比研究,作者指出未来国内研究应重点加强旅游交通和住宿业等重点领域能源需求与排放的定量实证研究,加强旅游业能源需求与排放的预测分析和情景研究,加快推进旅游业气候政策研究,切实提高旅游业应对气候变化和节能减排的研究水平,提高政策措施针对性和可操作性,以期为我国旅游业节能减排、应对气候变化提供科学依据。     

Climate Variability in the Origin Countries as a “Push” Factor on Tourist Arrivals in the Philippines

The objective of this paper is to test the impact of climate variability in origin countries as a “push factor” on tourist arrivals, specifically in the Philippines, and to select a suitable proxy to measure climate variability. This paper uses the Southern Oscillation Index (SOI) constructed by the Australian Bureau of Meteorology. Climate variability is strongly linked to the El Niño Southern Oscillation (ENSO) and this link is used by meteorologists to forecast changes in weather globally. SOI is a widely used indicator of the ENSO and its best known extremes are the El Niño (warm phase) and La Niña (cold phase) effects. The study proves to some extent that there is a significant increase in US tourist arrivals in the Philippines when La Niña-like weather conditions prevail in the USA. More importantly, the SOI proved to be a good measure of climate variability.     

低碳经济及其发展路径:一个研究综述

低碳经济是目前研究的热点问题,文章在对低碳经济发展的背景进行介绍的基础上,从低碳经济及其内涵、经济发展与碳排放、减排的经济成本以及中国实现低碳发展面临的挑战与低碳经济发展的路径等四个方面对国内外低碳经济研究现状进行了归纳和总结。     

Global Energy and Environmental Impacts of an Expanding China

I.Introduction Rapid economic growth in China and China’s economic size have important implications for energy use and environmental outcomes in China, regionally and globally. Although?2006 The Author Journal compilation ?2006 Institute of World Economics and Politics, Chinese Academy of Social Sciences most statistics related to China are impressive, those related to energy use and environmental problems are startling. China is currently the world’s third largest energy producer and …     

Financial and economic performance of major Brazilian credit cooperatives

The credit union's main functions are the provision of individual financial loans based on collective savings, reaching up to provide full banking services, with expansion of its social function. Cooperatives are an alternative to supply a credit demand in the market, because a third of the municipalities have no bank branches. Although the participation of cooperatives in credit operations is still small compared to the Brazilian national banking system, its continued growth demonstrates the importance of this sector. In this sense, the analysis of the performance of these cooperatives becomes relevant to the extent that incentives to industry expansion differ from other financial institutions. In this context, this study aimed to analyze which the financial and economic performance of Brazil's largest credit unions. This performance analysis was performed using the indicators proposed by the CAMEL model, then the data envelopment analysis (DEA). It can be seen that there is a positive relationship between the use of variables in the model and the measurement of financial performance of credit unions. Moreover, according to the results, it can be observed that Uniprime Northern Paraná, Sicoob Cocred and Sicredi North RS/SC were cooperatives that stood out as efficient.     

城乡统筹发展的微观解理:企业与农户和谐共生

作为城乡和谐共生的一个微观体现 ,基于供应链管理的企业与农户共生不仅有利于实现整个供应链竞争力的提升 ,实现企业与农户共赢 ,而且对于实现城乡协调发展、 构建和谐社会具有重要而深远的意义。涉农供应链中共生关系的发展遵循一条循环往复、 螺旋上升的路径 ,涉农企业与农户共生关系的维系和强化是涉农供应链构建、 发展的关键。因此 ,应营造有利于共生关系发展的良好共生环境。     

低碳物流成本管理探析

中国已经是世界第一碳排放大国,实施低碳物流成本管理是必须面对的问题。实施低碳物流成本管理是降低碳排放量,降低中国的经济风险,提升中国的国家形象,优化产业结构的重要手段。所以在实际工作中必须加强物流成本管理理论的研究,实行低碳认证的物流管理,重点抓运输与配送模块管理等,这些工作措施为低碳物流成本管理在全国范围的实施铺平道路。