混合模型试验等效水深截断系统优化设计研究

进行了深海海洋平台混合模型等效水深截断系统优化设计试验研究,优化方法选用混合离散变量模拟退火法,目标函数为截断系统和原系统的静力特性相似程度。以一个转塔式系泊浮式生产系统为例进行了等效水深截断系统优化设计计算。     

基于半仿真实验系统的调谐质量阻尼器等效阻尼力测量

为了研究调谐质量阻尼器(tuned mass damper,TMD)在海洋平台冰激振动中的减振效果,提出一种基于半仿真实验系统的TMD等效阻尼力测量方法,利用该系统可以直接测试结构安装TMD装置时产生的作用力.介绍该实验系统的测试原理及等效阻尼力的测量方法,并在正弦位移输入下,对TMD装置进行了测试,比较等效阻尼力的实测值与计算值,结果证明利用该系统可以测量得到TMD的等效阻尼力.     

水下运载器外挂负载的系统测试方案及仿真

研究水下运载器外挂负载的测试问题,根据负载功能,建立了负载的系统模型。考虑到系统可测性,模型中增设一些辅助元件和电路,测试计算机通过与负载的自动驾驶计算机通讯,由自动驾驶计算机施加激励和采集响应,完成测试。最后,对测试方案进行了仿真试验,并分析了仿真结果。     

Community based fishery management within the Menai Bay conservation area: A survey of the resource user

Management strategies are challenging to implement in Zanzibar's fisheries because the local people depend upon these resources for basic subsistence. This difficulty epitomizes the vital need for sustainable management: the more people need a fishery, the harder it is to limit fishing to allow regeneration. Comparing fisheries management strategies in two coastal villages in Unguja, the largest island of Zanzibar, Tanzania, this paper confirms the results of existing scholarship that communitybased strategies provide the most promising solutions to this challenge. Interviews with officials from the Department of Fisheries and Marine Resources, Village Fishermen Committees, and 51 fishermen in the villages of Kizimkazi Dimbani and Jambiani reveal the efficacy of strategies where local fishermen are centrally involved. The fishermen interviews reveal ignorance of existing fishing regulations and a lack of enforcement while fishermen at both sites noted that many illegal methods of fishing are still in use and expressed concern that such methods damage fish stocks. The Village Fishermen Committees, a recently implemented community-based initiative, are well attended by fishermen, and constitute a management strength that this paper concludes should be the foundation of future policy. To be successful, these committees need additional educational and financial resources.     

2010—2020年我国实验室海水盐度能力验证结果

2010—2020年期间我国(不包括港澳台地区)开展了5次7组样品的海水盐度能力验证,共有119家实验室参与,历年来获得443个海水盐度检测数据。由于各组数据均明显偏离正态分布,因此迭代算法A比经典统计方法、中位值和标准化四分位距法更适合评定能力验证结果。2010—2020年“不满意”率由20.3%降至4.9%,参与能力验证次数越多的实验室和取得检验检测机构资质认定的实验室,“不满意”结果较少,说明能力验证是提高实验室检测技术能力的有效手段,资质认定质量管理体系对确保检测数据准确性的作用明显。     

Analysis and simulation of wave records through fast Hartley transform

The Hartley transform, a real-valued alternative to the complex Fourier transform, is presented as an efficient tool for the analysis and synthesis of ocean surface wave records. Basic theoretical properties of this real-valued transform are briefly reviewed. Similarities and differences between Fourier and Hartley integral transforms, as well as computational benefits and disadvantages between numerical algorithms used to evaluate their discrete versions, are presented. The fast Hartley transform algorithm is used to simulate stationary Gaussian time series of the sea surface elevation and to estimate the spectral density function, the Hilbert transform and the envelope function of wave records.     

利用博弈模型分析和评价日本渔业管理

分析日本渔业协同组合的建立对日本渔业管理活动的改进,针对这种政府、渔业协同组合和渔民的行为选择结果能够达到相对均衡状态,并且能够有效弥补政府单一监管模式的不足的管理模式,本文从博弈论角度分析渔民、政府、渔业协同组合的行为选择依据,得出了渔业协会是政府有效监管的必要前提,进而对我国渔业管理提供很好的借鉴意义。     

A voluntary reduction in the commercial catch of rock lobster (Jasus edwardsii) in a New Zealand fishery

We describe the development and application of a management procedure (decision rule) that resulted in a voluntary reduction in the commercial catch of spiny rock lobster (Jasus edwardsii) in the lower east coast of North Island of New Zealand. The management procedure was developed from an accepted assessment of the CRA 4 (Wellington‐Hawke's Bay) fishery, which used an integrated length‐based assessment model fitted to commercial fishery catch‐per‐unit‐effort (CPUE) biomass indices, commercial length‐frequency data, and tag‐recapture data. The assessment model had been Bayesian, and used the joint posterior distribution of parameters to predict the effect of 384 alternative harvest control rules on the future size of the CRA 4 stock. The harvest control rules all used CPUE as their input, and generated annual changes in catch, which were then simulated by the population dynamics of the operating model. Uncertainty was added to evaluations through observation error, added to the simulated CPUE observations, and stochastic serial auto‐correlation variation in recruitment. We describe how this management procedure was used to effect a voluntary reduction in catch to address the problem of a rapidly declining population.