Enhancing environmental quality in the United States by linking biomass energy consumption and load capacity factor     

《地学前缘(英文版)》2023,14(3):101531

This study analyzes the impact of biomass energy, financial development, and economic growth on environmental quality using the novel Fourier autoregressive distributed lag (ARDL) approach on annual data for the period 1965–2018 in the United States (USA). The study analyzes the impact of related variables on the load capacity factor (LCF) as well as on indicators of environmental degradation such as carbon dioxide emissions and ecological footprint. The LCF is one of the most comprehensive environmental indicators to date, encompassing both biocapacity and ecological footprint. In this regard, this study contributes to the environmental economics literature by examining, for the first time, the impact of biomass energy on the LCF. The results of the cointegration test show that there is only a long-run relationship between the LCF and the independent variables. According to the Fourier ARDL results, biomass energy improves the environmental quality, while financial development has no effect on the LCF. Moreover, the increase in per capita income reduces the LCF. Furthermore, since the income elasticity is larger in the long run than in the short-run, the environmental Kuznets curve is validated. Therefore, the United States government should encourage the use of biomass and investment in this form of energy.  相似文献   

Experimental investigation of hull girder vibrations of a flexible backbone model in bending and torsion     

Suji Zhu  MingKang Wu  Torgeir Moan 《Applied Ocean Research》2011,33(4):252-274

Although the coupled horizontal–torsional vibrations of open ships have been investigated numerically for decades, the available experimental data in oblique seas seem rare. Model tests, considering natural frequencies of bending and torsional modes, have been conducted by the Centre for Ships and Ocean Structures (CeSOS) in the towing tank and ocean basin. A flexible backbone model was designed with five cut-outs on the top side of the aluminum beam to realize approximately torsional stiffness as well as vertical and horizontal bending stiffness. This paper mainly deals with measured bending and torsional vibrations in regular and irregular waves. The damping ratios, mode shapes, and modal moments were derived from experimental data, and a numerical model based on modal superimposition is established according to the measured hydroelastic properties. Some time-domain simulations are carried out considering the structural characteristics, and compared with measured results. The test data in regular waves are presented to show the possible factors of influence on the vibrations. The effect of bending and torsional vibrations on the extreme response values in irregular waves is estimated. The uncertainties in the experiments are discussed and conclusions are presented at the end of this paper.  相似文献   

复合地基垫层效应研究综述   总被引：1，自引：0，他引：1       下载免费PDF全文

易耀林  刘松玉 《地震工程学报》2011,33(Z1)

垫层技术是复合地基的关键技术之一。本文总结了当前复合地基垫层效应和作用机理的研究现状,重点介绍了刚性基础和柔性基础下垫层对复合地基荷载传递规律、破坏模式、承载力和沉降特性的影响方面的研究。并从调整基础刚度的角度出发对垫层效应和作用机理进行了讨论。  相似文献   

Catch-quota balancing mechanisms in the Icelandic multi-species demersal fishery: Are all species equal?     

《Marine Policy》2015

In this study, utilization of catch-quota balancing mechanisms in the Icelandic demersal fishery, which allow for individual transferable quota to be transformed among species and transferred between years, is analyzed to determine whether annual catches closely adhere to total allowable catches on average. Icelandic landings data for 14 demersal fish species during 2001–2013 are compared to implemented total allowable catches as well as catch limits recommended by the Marine Research Institute (MRI) and a proxy for annual market values. Landings surpassed legal limits of total allowable catch in 27% of the cases (landings by species by fishing year), mostly due to species transformations, but TAC overages were not consistent for any species. Instead, catches of some species were consistently less than legal limits, with some indications that landings were related to profitability (i.e. landings were correlated with market value). However, landings surpassed MRI recommendations in 67% of the cases, and landings of four species (Atlantic wolffish, haddock, monkfish and redfish) consistently exceeded MRI recommendations. Therefore, discrepancies between scientific recommendations for catch limits and quotas selected through the political process may represent a higher risk to long-term sustainability than catch-quota balancing mechanisms.  相似文献   

地理信息服务网站服务器集群负载均衡技术应用研究     

翟永  杨曦 《测绘软科学研究》2010,(6):20-23

在分析基于互联网的地理信息在线服务特点和网站服务质量需求的基础上,对服务器负载均衡的构建方式、调度算法进行了讨论,给出了地理信息服务网站服务器两层负载均衡的设计模型,描述了Web服务器负载均衡的设备部署、调度算法和健康性检测等方面的设计内容;同时,讨论了文件和关系型数据库服务器负载均衡的设计思路及调度算法的具体应用。  相似文献   

VRRP在气象网络升级改造中的应用     

张杰 《内蒙古气象》2014,(3):41-43

文章从全区气象网络的可靠性现状出发,简要介绍了虚拟路由冗余协议V R R P的原理,分析了改造建设的需求,阐述了改造建设的整体规划,提出应用V R R P协议提升全区气象网络的可靠的解决方案,从保护投资和提高网络可靠性的角度提出一种实用的解决方案。  相似文献   

山西静乐井水位异常调查与分析   总被引：3，自引：0，他引：3  

吕芳  张淑亮  胡玉良  宁亚灵  刘瑞春  张俊民 《山西地震》2013,(3):28-31

山西静乐井水位从2007年7月以来,出现了第4次高值异常,但此次异常的特征与以往高值异常存在明显的差异。文章根据影响静乐井水位动态变化的主要因素,从井区环境、同层地下水开采情况及降雨三方面对静乐井水位第4次高值异常成因进行了调查与分析,明确了此次异常的性质。同时,根据静乐井对地壳应力一应变的响应能力及高值异常与地震活动的对应关系,给出了其对未来地震趋势的预测意义。  相似文献   

Total load transport in gravel bed and sand bed rivers case study:Chelichay watershed     

Arman HADDADCHI  Mohammad H.OMID  Amir A.SDEHGHANI 《国际泥沙研究》2013,28(1):46-57

Field experiments were conducted on total load transport in the Chelichay River Basin,a mountainous catchment (1,400 km~2) located in north eastern of Iran,to evaluate total load formulas including four gravel bed rivers and a sand bed river(Qaresoo River).Gravel bed rivers in Chelichay River Basin can be grouped into two types;steep slope rivers with high shear values(Chehelchay River and Khormaloo River) and mild slope rivers with low shear values(Narmab River and Soosara River).Two depth integrating suspended load samplers(DH-48 and D-49),and two bed load samplers(Helley-Smith and BLSH) were used to measure total load.The performance is tested of 8 total load transport formulae including 4 macroscopic and 4 microscopic methods.A systematic and thorough analysis of 59 sets of data collected from sand bed river indicate that Yang and Engelund and Hansen reach to the better results, and from four gravel bed rivers confirmed that the methods of Karim and Kennedy and Engelund and Hansen yields the best results for steep slope rivers,and the methods of Einstein and Bijker are ranked highest in gradual slope rivers.  相似文献   

云GIS环境下负载均衡算法研究     

李刚  王旭刚  刘宝玲 《测绘工程》2013,22(3):36-40

根据对云GIS案例的分析,从概念、软硬件拓扑结构、数据类型、请求处理流程等方面分析相关特点和问题,提出建立针对云GIS的负载均衡模型是整体提高云GIS性能的核心关键,并构建基于量子蚁群算法的负载均衡模型。通过云仿真技术构建云GIS平台,对模型进行仿真测试和压力测试,结果表明其性能有显著提高。  相似文献   

A new load balancing scheme on heterogeneous database cluster     

Gong Weihua  Wang Yuanzhen 《地球空间信息科学学报》2013,16(3):216-222

In heterogeneous database cluster, the performance of load balancing is closely related to the computing capabilities of heterogeneous nodes and the different types of workloads. Thus, a method is introduced to evaluate the load status of nodes by the weighted load values with consideration of both the utilization of different resources and the workload types in a load balancer and an efficient and dynamic load balancing scheme is proposed for OLTP(online transaction processing) workloads to maximize the utilization of distributed resources and achieve better performance, which need not collect the feedback of load information from the lower nodes and effectively keeps from the data skew. The simulation results for OLTP services gained by TPC-C tool show that the dynamic weighted balancing policy leads to sub-linear throughput speedup and keeps the heterogeneous cluster well balanced.  相似文献