The effect of mode 4 liberalization on illegal immigration

This paper aims to assess the impacts of the temporary movement of workers on the illegal immigration. It uses a discrete time, forward-looking model with heterogeneous agents, in order to describe the decision made by illegal migrants from developing countries. Illegal migrants are supposed to accede only to the informal sector and are price takers, as they have no negotiating power. Taking into account these specifications, the theoretical model is solved analytically and illustrated numerically. It demonstrates that under some conditions, the liberalization of temporary movement of workers could lead to a decrease of illegal migration.     

木材可追溯性、林产品市场准入标准与中国林产品贸易

首先界定了木材可追溯性的概念和内容,然后从政府、环保组织和企业三方面总结了国际社会各界的反应,最后分析了木材可追溯性的发展趋势及其对中国的启示。研究结果表明:发达国家以环境贸易立法的形式提出的木材可追溯性的强制性要求越来越明确和具体,沿着林产品供应链向纵深方向发展,已成为林产品国际市场准入的一个新标准;木材可追溯性得到了国际社会各界的纷纷响应,正从世界主要林产品消费国向木材供应国发展,全球范围的木材可追溯体系即将形成。中国作为一个长期的林产品贸易大国,在世界林产品贸易格局中处在中间加工国的位置,必须客观分析木材可追溯性标准的影响,建立和完善中国的木材可追溯体系。     

松辽盆地北部油页岩测井识别技术研究

本文分析了松辽盆地北部取芯资料,总结了青一段的油页岩测井响应特征,进行了参数优选,建立了油页岩的识别图版、参数解释模型及油页岩的划分标准,确立了油页岩测井识别方法,明确了松辽盆地北部的油页岩分布规律,为松辽盆地北部油页岩的综合评价提供了技术支撑。     

期货内幕交易罪立法之国际比较

期货内幕交易行为是期货市场的病毒,严重扰乱了期货市场秩序,其危害是导致了不公平竞争和非诚实信用.分析内幕交易行为的犯罪构成,比较各国(地区)禁止期货内幕交易行为的立法例.对于内幕交易行为的惩处方式,可增设剥夺从业资格.     

Illegal trade in the Iranian economy: Evidence from a structural model

This study investigates the causes and consequences of import and export smuggling and estimates its relative size in Iran from 1970 to 2002. Multiple Indicators–Multiple Causes (MIMIC) modeling and trade misinvoicing are used to compute the latent variable of smuggling. The results indicate that the penalty rate for smuggling and the quality of economic and political institutions reduce smuggling, while tariffs and black market premia increase the incentives for illegal trade. More trade openness is associated with greater illegal trade in the case of Iran. On average, smuggling in Iran has been approximately 13% of total trade.     

The sustainability of timber production from Eastern Amazonian forests

Although the regulations are imperfectly enforced, logging firms in the Brazilian Amazon are subject to forest management regulations intended to reduce environmental damage and protect future forest productivity. Additionally, voluntary best practices firms adopt to achieve environmental performance that exceed regulatory requirements are largely limited to reduced impact logging (RIL) systems that reduce harvest damage relative to conventional logging systems used by a large majority of firms in the region. Existing regulations combined with best practices may not be adequate to ensure sustained yields. This inadequacy is an important issue as Brazil implements an ambitious program of forest concessions on public lands. We analyze the profitability and environmental outcomes of best logging practices and proposed sustainability requirements. We propose two operational definitions of sustainability (the first focusing on sustaining stand-level timber volumes and the other focusing on sustaining species-level volumes within the stand) based on sustaining timber inventories across cutting cycles rather than on sustaining overall harvest yields. RIL is shown to be profitable for loggers and increase the timber available for future harvests. While volume predicted to be available for the second and third harvests are significantly lower than the available timber in the unlogged forest, the second and third harvests are projected to be profitable and have the potential for sustainability despite high opportunity costs. However, as harvesting is repeated into the future, results show the composition of the harvest shifts from higher-value shade-tolerant and emergent species toward a greater reliance on longer-lived, lower-value pioneer species. This shift may create pressure to expand the forest base under management in order to continue to supply high-value species or increase the risk of timber trespass in conservation units and areas under community or indigenous management.     

超深井测井深度质量控制方法探讨

准确的深度是测井资料应用的基础,塔河油田超深井测井深度采用测井标准井标定并通过数学拟合的方式求取校正量。对标准井标定环境和实际测井环境的差异进行了分析,并提出了相应控制措施;同时对工程深度、录井深度和测井深度的误差产生原因及现场测井深度的检查方法进行了探讨。     

基于ISO 9000质量管理标准的仪器制造质量保障体系的构建

ISO 9000族标准是当代工业发达国家质量管理和质量保证经验的科学总结。胜利油田为了提高录井仪器制造质量,从过程控制着手．构建了基于ISO9000质量管理标准的仪器制造质量保障体系。从制造质量保障体系的要素分析、制造过程识别、质量控制点的设立及质量控制等方面对该质量保障体系的构建进行了阐述。     

提高多参数组合仪测井质量的技术方法

针对油田动态监测测井中较为常用的多参数组合测井仪器，从传输方式以及测量精度上进行了定性的分析研究。提出了提高测井质量的技术方法，总结了实践经验，对于提高动态监测质量是行之有效的。同时还阐述了仪器发展的技术途径和方向。     

木材合法性贸易要求对中国木材加工企业的影响及应对——基于江苏、浙江和山东木材企业的调查分析

结合中国木材企业生产和经营特征,认为企业可以采用经过森林FM认证的木材原料和经过合法性认证的木材原料保证木材原料来源合法性,可以进行森林企业产销监管链Co C认证和自建完备的产销履历制度保证产销流程可追溯性。研究结果表明:木材合法性贸易要求会造成企业生产成本上升、生存压力不断加大、盈利空间进一步缩窄,但也能给企业带来销售收入增加的有利影响。