工程机械机外噪声声源分析及降噪处理的有关探讨

工程机械机外噪声不仅对环境造成很多负面影响,而且会对人体造成很大伤害,要找出正确的处理策略,确保生态环境,为人类营造一个健康的居住环境。本文主要是对工程机械机外噪声声源分析,以及探讨降噪处理的有关处理措施。     

油气集输工艺技术分析

在我国石油事业的建设中,油气集输是非常重要的一项工作,其主要将我们日常油田开采工作中所采集的石油以及天然气等资源进行一系列的加工、收集。在本文中,将就我国的油气集输工艺技术进行一定的分析与探讨。     

燃气轮机的清洗原因及其对策浅析

本文主要介绍了防止燃气轮机性能恶化进行燃气轮机的清洗原因分析,燃机清洗的主要方法以及压气机清洗中需要特别注意的事项,对于提高燃机轮机稳定运行出力的安全性和经济性具有一定的借鉴意义。     

油气管道安全管理问题及加强措施

就目前我国油气管道安全管理水平与质量来看,油气管道运输管理存在一定的问题。因此相关部门必须积极采取有效措施,切实解决油气管道管理问题,提高管理的安全性和科学性。     

UNDERSTANDING ENVIRONMENTAL RESPONSIBILITY OF CITIES AND EMISSIONS EMBODIED IN TRADE

The attribution of greenhouse gas (GHG) emissions embedded in interregionally traded products to either production or consumption regions is a key issue to the understanding of the global environmental responsibility of metropolitan areas. In this paper we identify GHG emissions for which metropolitan areas assume responsibility by allocating emissions embodied in import and export products to regions of either consumption or production in the cases of three US metropolitan areas. The case studies show that embodied emissions in both export and import products accounted for 63–73% of total GHG emissions directly and indirectly pertaining to these metropolitan economies. These findings suggest that an accounting method that incorporates emissions embodied in product trade has relevance to the development of local policies that govern actions ranging from redirecting metropolitan development patterns toward low carbon emissions to promoting sustainable consumption behavior, particularly those involving the collaboration of cities.     

基于分区模式城市燃气管网水力可靠性管理技术

针对大型城市燃气环状管网(环网)存在的问题,探讨城市燃气管网采用分区模式的条件及分区方法、分区模式下城市燃气管网水力可靠性管理技术,并以某市燃气管网为例进行分区模式管网水力计算和可靠性计算。结果表明,集中型城市燃气管网采用分区模式是可行的,是一种较好的集中型燃气管网模式。     

碳税情景下企业碳减排技术创新的响应机理与系统仿真

在目前中国尚未正式开征碳税的背景下,基于多主体系统仿真对不同碳税情景下企业的碳减排技术创新响应机理进行了模拟分析。结果表明:目前110元/吨的碳税税率尚不能明显改变企业的传统技术创新行为,当碳税税率上升到128元/吨后企业才逐步进行碳减排技术创新,当碳税税率达到285元/吨后所有企业皆进行碳减排技术创新。     

Procurement as innovation policy and its distinguishing effects on innovative efforts of the Brazilian oil and gas suppliers

This paper aims to assess the effect of public procurement for innovation (PPI) in the Brazilian oil and gas sector on the innovative behavior of suppliers. It emphasizes the role PPI may play in developing countries due to its ability to target a wide range of firm sizes and to contribute to a more even diffusion of technical progress. Using microdata from RAIS and coarsened exact matching, results show that treated firms present on average a higher intensity of innovative efforts than the control sample. In small firms, PPI has a positive effect on the probability of carrying out innovative activities. Once small firms have decided to carry out these activities, treated and control samples have similar innovative effort intensities. The treatment’s effect on large firms’ probability of performing innovative activities is positive but lower than small firms. Nonetheless, there is a significant and positive effect on the intensity of these efforts. The paper suggests that, due to its effects over a wide range of firm sizes, PPI may be a worthwhile policy to implement for the reduction of structural heterogeneity present in developing countries.     

节能减排政策对城市生态效率的影响——基于NDDF-DID的市级实证研究

采用非径向方向性距离函数测算了2005—2016年我国的城市生态效率,发现我国城市生态效率取得了明显改进,采用双重差分法实证研究了节能减排政策对城市生态效率的影响,结果表明:节能减排政策显著提高了城市生态效率,趋势性检验和安慰剂检验验证了双重差分估计的有效性和稳健性。最后,根据研究结果提出我国应该坚持推进节能减排政策,扩大节能减排政策的覆盖范围,加强节能减排政策的财政支持力度,同时指出城市在执行节能减排政策过程中,应当注重建立长效机制,以更好地实现节能减排政策的效果。     

A novel discrete network design problem formulation and its global optimization solution algorithm

Conventional discrete transportation network design problem deals with the optimal decision on new link addition, assuming the capacity of each candidate link addition is predetermined and fixed. In this paper, we address a novel yet general discrete network design problem formulation that aims to determine the optimal new link addition and their optimal capacities simultaneously, which answers the questions on whether a new link should be added or not, and if added, what should be the optimal link capacity. A global optimization method employing linearization, outer approximation and range reduction techniques is developed to solve the formulated model.