Do greater amounts of FDI cause higher pollution levels? Evidence from OECD countries

Using an ARDL model for a panel of 15 OECD countries, this work analyses the impact that FDI, both jointly and by sector, has on CO₂ emissions. The findings reveal that these countries are yielding to the pressure on the trade sector. Unexpectedly, gross fixed capital formation shrink pollution, excluding in the mining sector. With findings supporting the Pollution Haven Hypothesis, policymakers must pay attention to FDI inflows, ensuring that FDI place high importance on the transfer of green technologies to improve the efficiency. These goals could be achieved through an increase in the stringency of environmental laws within the host countries, especially the ones related to FDI.     

Does biomass energy consumption reduce total energy CO2 emissions in the US?

This study investigates the causal relationship between total biomass energy consumption, total energy CO₂ emissions, and GDP in the United States for the period January 1973–December 2016 by employing a directed acyclic graph (DAG) techniques and the Autoregressive Distributed Lag (ARDL) model. Additionally, this paper examines the existence of the environmental Kuznets curve (EKC) hypothesis. The result of the DAG reveals that total biomass energy consumption and GDP have a unidirectional contemporaneous causal relationship with total energy CO₂ emissions. Based on the results of the ARDL, we find that a 1% increase in per capita total biomass energy consumption causes a 0.65% reduction in per capita total energy CO₂ emissions in the long-run. This finding implies that expanding the usage of biomass is one way to reduce and control greenhouse gases in the US. Moreover, we find that the inverted U-shaped EKC hypothesis is satisfied for the US case. Findings from this study suggest that energy policies should stimulate an increase of biomass production for reducing total energy CO₂.     

区块链背景下智能包装产业新模式

区块链具有数据防篡改、可溯源等特点,智能包装具有数据采集、信息互动等优势,区块链可以为智能包装的进一步发展与应用提供新技术,而智能包装则可以拓宽区块链的应用领域,两者的融合必将引发智能包装产业模式的新一轮变革。在深入解析区块链发展阶段、分类、特点,以及智能包装功能、作用、发展现状与问题之基础上,努力探索两者融合发展的融合点、融合路线以及融合模式,能够为智能包装产业发展提供切实的理论指导。     

一类弹性系统的内部精确能控性

该文考虑的是具有分布控制的Timoshenko梁系统的精确能控性.用谱分解方法建立了保守系统的正反向能量不等式,证明了在通常的能量空间中该系统是精确能控的.     

分布式创新中的知识网络构建

在回顾现有分布式创新概念的基础上,给出分布式创新的一般定义,并指出分布式创新知识网络的意义和网络构建障碍。依据管理支持和受益主体2个维度,划分出分布式知识网络的4种类型:个人爱好网络、专业学习网络、最佳实践网络和商机网络。基于对国内企业调研分析和国内外文献研究,提出构建分布式创新知识网络的4个重要阶段,即聚焦知识网络、创建网络背景关系、网络活动惯例化和利用网络成果。     

分布式认知视角下远程教育网络平台探析

分布式认知理论为人机交互和知识共享提供了理论基础。在分析现有远程教育网络平台的基础上,运用分布式认知理论探讨了其视角下远程教育网络平台的构建,以帮助人们实现人与计算机更加和谐的交互,提高网络学习效率。、     

Design and implementation methodology based on Petri net formalism of flexible manufacturing systems control

This paper presents an aided design methodology of flexible manufacturing system control with a view to industrial implementation. The approach considered through a modelling phase, the a validation phase by simulation and finally a distributed implementation phase. In the modelling phase, based on the Petri net formalism, we demonstrate the hierarchical aspect which separates the part flow control and the product resource control. In addition, we emphasize generic aspects which allow us to use an object-oriented approach. These aspects and the set of modelled objects are directly used in the simulation and production phases after an automatic translation in an implementation language (ADA in our case). In consequence, the distributed location for those two phases is well facilitated from the viewpoint of the approach used.     

悬置共面波导的特性阻抗

悬置共面波导兼有鳍线和悬置带线的优点。文中用共形变换技术分析悬置共面波导，得到严格的解，考虑有限厚度基片情况下给出了悬置共面波导的有效介电常数，单位长度电容和特性阻抗的闭合表达式。     

经济增长由投资拉动转向消费拉动的现实选择——基于税收政策效应的实证分析

消费是影响和决定国民收入的重要因素，如何实现经济增长由投资拉动向消费拉动的转变，是当前经济形势下迫切需要解决的问题。通过引入虚拟变量，从税收政策视角建立消费函数计量模型，对影响中国居民消费行为的因素进行了量化和深入分析，并基于模型的分析结果给出了政策界面。     

海洋渔业资源管理的理论探讨

集权管制的失败 ,引导人们探讨自然资源管理的替代形式。文章在分析海洋渔业资源的政府集权管理的基础上 ,对分权管理方案的几种形式进行了阐述 ,并试图建立一种地方化的资源管理结构———社区资源管理公司 ,扩展对分权管理的研究。