From medicine to poison: how flexible strategic environmental assessment may be? Lessons from a non-regulated SEA system

Empirical research dedicated to Strategic Environmental Assessment (SEA) is mostly grounded on SEA systems guided by legal requirements, clearly stated procedures and systematic use of SEA to policy- and plan-making. Nevertheless, a considerable parcel of SEA practice is currently occurring in countries with no specific legislation or guidance to be followed, i.e. non-regulated SEA systems. Therefore, it is important to understand how SEA is performing in these countries and to establish whether related SEA systems are subject to the same premises and perspectives of effectiveness that have been reported in literature so far. The paper provides a comprehensive analysis of the state-of-practice in Brazil, based on best practice analysis of SEA reports and interviews, reporting empirical evidence regarding the use of SEA and its related timing, procedural performance and key players involved. Main findings reveal an isolated instrument, embroidered in a disperse and unclear framework, poorly coordinated and highly sensitive to circumstances. Provision of a structured system, indicating clear purposes of SEA, systematic procedures and stakeholder’s responsibilities are suggested as potentially relevant measures to balance current system’s flexibility, thus fostering SEA effectiveness.     

Effectiveness of strategic environmental assessment in Germany? – meta-review of SEA research in the light of effectiveness dimensions

SEA practice in Germany has been growing since its introduction and so has the number of SEA research projects and publications. This paper provides a meta-review of German SEA effectiveness research published between 2004 and 2018. In this context, we discuss: (1) What is the status quo of SEA application in Germany? (2) What dimensions of SEA effectiveness have been addressed in research to date? and (3) How effective is SEA in Germany? Our findings indicate that there is room and need for SEA improvement, for example, with regards to the practice of screening, transparency, and quality management. With a focus of previous SEA research on the dimension of procedural effectiveness, future research should aim at other dimensions and their interactions (substantive, transactive, knowledge and learning, legitimacy).     

Outcomes and contextual aspects of strategic environmental assessment in a non-mandatory context: the case of Brazil

Within the ample body of literature devoted to strategic environmental assessment (SEA) outcomes and the assessment of its effectiveness, it is accepted that the performance of SEA systems is influenced by contextual aspects. Procedural aspects, objectives, guidance, approach, timing, amongst others, are reported as key components of the different dimensions of SEA effectiveness but their linkage to SEA outcomes is yet to be adequately investigated. In this paper, contextual aspects and related outcomes of a non-mandatory SEA system were identified through systematic literature review and personal interviews with key actors of SEA, aiming at the identification of the influence of contextual factors on SEA effectiveness. The findings indicate three main aspects that may explain the lengthy process of introduction of SEA in plan- and policy-making in the country: (i) lack of proper SEA legislation, (ii) the influence of Environmental Impact Assessment practice and (iii) the influence of the environmental licensing culture. Nevertheless, SEA contributes to improving communication between stakeholders along the planning process and to providing a better level of information for lower tiers of decision-making. In spite of the minor influences on the nature of the strategic action, valuable lessons credited to SEA have been learnt.     

Evaluating strategic environmental assessment in The Netherlands: content,process and procedure as indissoluble criteria for effectiveness

To assess the effectiveness of strategic environmental assessment (SEA) we distinguish between its contribution to the quality of the ultimate policy choice (usefulness, applicability), the procedural quality of the planning process (transparency, timeliness) and the quality of stakeholder participation in the planning process (openness, equity, dialogue). In the context of two case studies involving Dutch planning practice, we argue that when and how an SEA is applied is crucial to understanding its effectiveness, and show that effectiveness depends upon its alignment with, and embedding in, the planning process.     

统计能量法用于空间有效载荷力学响应的分析

针对空间有效载荷特点,采用统计能量法(SEA)进行动力学响应研究。运用该方法建立某有效载荷的SEA计算模型,仿真分析结构整体及关键单元的力学响应,并与实测值进行比对。结果表明,该方法可较好地应用于空间有效载荷力学响应分析,计算精度满足工程要求。     

An evaluation of environmental impact assessment in Eritrea

This paper reviews the environmental impact assessment (EIA) system in Eritrea against a set of evaluation criteria. It analyses the institutional aspects of EIA, the process of EIA, together with other features of the system. The review indicates that the current EIA system in Eritrea meets eleven of the 18 evaluation criteria, partially meets three and fails to meet four. The major weaknesses relate to; the lack of legal provision for EIA; inadequacy of resources; failure to make the EIA findings a key aspect of decision-making; and the lack of formal provision for Strategic Environmental Assessment (SEA). To strengthen the current EIA system in the country, therefore, investment in training and continuing professional development in EIA for different stakeholders is needed. The most urgent priority is the establishment of a sound legal basis for EIA.     

滚动轴承支承的齿轮传动轴-板耦合结构功率流传递特性研究

针对影响机械设备整机工作性能的齿轮箱系统动态特性,通过对齿轮箱系统振动噪声的产生机理及传递路径分析,建立轴系传动系统中典型组合结构—板-滚动轴承-齿轮轴-滚动轴承-板耦合系统的动力学模型,并应用子结构导纳法推导计算通过滚动轴承传递到箱板振动功率流的模态解。考虑到模态解的模态密集性,据统计能量分析原理,研究齿轮轴-滚动轴承-板耦合结构的耦合损耗因子的估算方法,统计能量分析与模态解的结果显示,吻合性较好。对振动能量通过滚动轴承传递的特性及影响因素进行研究分析,为齿轮箱系统减振降噪设计提供理论依据。     

统计能量分析参数的综合确定方法及应用

根据统计能量分析(SEA)法，对某卫星声振环境和某返回舱噪声环境进行了计算分析。提出了仅通过一次试验获取SEA参数的综合确定方法，根据这种方法对SEA模型参数进行修正，利用修正过的参数计算的卫星结构响应结果与试验结果更加接近。另外，还针对SEA模型参数的灵敏度问题进行了分析。在返回舱的应用中，将SEA法预示结果与曲线拟合方法预示结果及试验结果相比较，结果说明三者一致。