共查询到20条相似文献,搜索用时 140 毫秒
1.
基于Surfer Automation技术的三维立体渲染图的绘制 总被引:17,自引:0,他引:17
三维立体渲染图是由许多三维数据点通过透视变换 ,再加上表面灰度而生成的图形。研究了新版Surfer软件提供的Automation技术 ,用VB编程语言在客户应用程序中快速实现了三维立体渲染图绘制功能 ,做到了客户开发软件界面和功能的完美统一。 相似文献
2.
3.
为促进辽宁省渔业尤其是海洋渔业的可持续发展,文章综合相关统计数据,运用产业结构三轴图和灰色关联度分析方法,系统分析辽宁省渔业产业结构及其主要产业的发展情况以及6个主要产业对海洋渔业的影响程度,并提出发展建议。研究结果表明:辽宁省渔业第一产业仍占主体地位,但第二和第三产业占比逐渐提高,产业结构三角形的重心呈左旋趋势;渔业第一产业有所优化,第二产业对渔业经济发展起到支柱作用,第三产业以水产品运输业为主;海水产品加工业和运输业对海洋渔业的影响程度最高;未来辽宁省应继续科学发展海水养殖业、远洋渔业、水产品加工业、水产品运输业、休闲渔业和“互联网+渔业”,不断优化渔业产业结构。 相似文献
4.
5.
6.
在执行海洋地质保障工程"1∶500万中国海陆系列图-地质图"编图项目的过程中,研究并采用了较为新颖的海域地质内容编图方法,其中关键的技术是如何用叠置方法和透视方法表示海区被掩盖的地质体。叠置法无疑是按正常沉积序列表示地层的叠置关系;透视法的关键步骤就是将叠置在新近系之下的地质体透视到图面上。此方法可归纳为块、线、面三层透视,即被掩盖的中生界、浅层侵入岩或前古生代地壳以"块"的形式透视,其上叠置的古近系则以"线"的形式透视,线叠置在块之上,最上层的新近系以"面"表示。当然,有透视内容的区域此新近系"面"视为透明。对照20世纪80年代以来前人编制海域地质图的一些做法及其优缺点,此编制方法明显优于其他方法。有望今后在国内外海洋地质调查和研究部门进一步推广使用。 相似文献
7.
<联合国海洋法公约>及以后出台的一系列国际渔业协定、决议或公约促进了公海渔业制度的发展.本文阐述了公海及公海渔业的基本概念,介绍了现行公海渔业制度的主要内容,探讨了公海渔业制度的特征和今后发展趋势.在此基础上,分析了我国公海渔业现状,提出维护我国公海渔业权益的相应措施:(1)合理调整作业类型,积极开发新渔场;(2)建立国家级远洋渔船档案制度和捕捞数据收集制度;(3)积极加入国际渔业组织,在国际渔业管理中争取我国的权益;(4)建立违规渔船的惩罚制度;(5)加强远洋船员教育,提高远洋人员素质. 相似文献
8.
9.
肖惠武 《海洋与海岸带开发》2012,(5):27-31
文章通过对目前我国渔业用海面积、类型组成和地域结构等进行数据分析,结合实际,从养分失调、生境破坏、水域污染和范围缩小等方面阐述我国渔业用海面临的主要问题,提出应当实施完善审批报备制度、确保用海保有指标和强化依法用海意识等措施,以推进渔业用海保护工作与合理使用程度进一步提高。 相似文献
10.
影像地图的编制方法、内容展现有别于线划地图。较详细地介绍了《南京市老城区影像图册》比例尺、开本选择、影像编辑处理、图面内容要素表示、计算机编图的方法和手段。 相似文献
11.
基于对国内外渔业电子海图系统发展现状的研究,提出了开发新型渔业电子海图系统的构成、总体方案和功能模型,采用IHO S-57海图国际标准即海道测量数据传输标准(Transfer Standard for Digital Hydrographic Data)的电子海图,介绍了应用Visual C++2010开发环境和ECIVMS组件进行系统开发的关键技术和方法。本系统的设计与实现结果表明,软件已实现了海图物标图层显示、渔业信息查询、渔区数据库管理、渔区及作业安全等深线标绘、遥感影像加载,实时潮汐计算及海况信息叠加显示等主要功能,为渔业信息组网服务及构建一体化信息获取、存储、处理、表达、传输和发布平台提供了基础支持。 相似文献
12.
为贯彻落实国家实施乡村振兴战略的重大部署,促进新时代美丽渔村建设,文章在总结国外经验的基础上,结合文献梳理和实地调研,明确渔村振兴须妥善处理的关系,并提出渔村振兴的路径和政策。研究结果表明:通过加强顶层设计和产业融合等措施,日本、韩国和美国在渔业发展和渔村振兴方面都取得成功;我国渔村振兴应妥善处理三大关系,即渔民与土地(养殖和捕捞水域)的关系、渔民与渔民的关系以及渔民与国家的关系;渔村振兴的路径主要包括依靠主体、发展载体、富裕渔民、深化改革、要素投入、顶层设计、产业融合、繁荣文化和渔村治理9个方面,政策主要包括财政、科技、金融、人才和服务5个方面。 相似文献
13.
14.
The prediction of ship stability during the early stages of the design process is very important from the point of a vessel's safety. Hence, in this study, a formula is presented to estimate cross curves of fishing vessels to predict initial stability at the preliminary design stage. For this purpose, 175 fishing vessel forms have been generated from Doust trawler hull series. The predictive technique is established by regression analysis of systematically varied fishing vessel series data. The mathematical model is constructed as a function of main design parameters such as length to beam ratio LWL/BWL, beam to draft ratio BWL/T, moulded depth to draft ratio D/T and block coefficient CB. This prediction is also used to determine the effect of specific hull form parameters and load conditions on the stability of the fishing vessel. Some basic considerations on how the proposed method can be applied to a new fishing vessel are presented. 相似文献
15.
16.
橡皮艇的种类繁多、型号各异,有部队作战用的军用艇、武警防汛救援的防汛艇、专门追求速度的挂机艇、完全手动的皮划艇、体验激流乐趣的漂流艇、用于近海垂钓的钓鱼艇等。中国的橡皮艇业在近几年有着飞速的发展。文章从硬底橡皮工作艇基本特点和生产知识、概念设计目的和意义,以及概念设计对产品设计重要性等方面进行介绍,运用Solidworks软件对橡皮工作艇进行尺寸选择和结构布局设计,从而体现外观设计的人性化。通过对橡皮工作艇基本知识和主要设计理论的介绍,加强对橡皮工作艇设计方面的掌握。 相似文献
17.
《Marine Policy》2013
Marine protected areas created in a top-down way can be costly and ineffective due to low compliance of resource users. Conversely, employing users’ local knowledge and involving them in decision-making processes could decrease costs and conflicts, in addition to increasing the chances of management success. Here the potential to change conflicting MPAs into conservation areas that take into account fishers’ use and knowledge is assessed based on a case study on the Brazilian coast (Paraty town). Fishers (n=206) from 11 villages were interviewed regarding their main fishing targets and gear, and then only the experienced ones (n=41) were interviewed from three main fishing villages about the most important commercial species. Fish landings were sampled for one year in these three villages (n=823), where participatory mapping and group interviews with fishers were also conducted to determine their opinions regarding management and how they thought it should be undertaken. Management measures should not be equivalent across the whole region, as there were clear differences in the target species and gear used. Fishers identified 55 important fishing spots, eight of which were important for more than five villages, while the experts identified 10 important fishing areas for the target species, which was supported by the sampling of fish landings. The fishers were not opposed to management and no-take reserves but would make some changes in the current design of these measures if it were up to them. Based on these data, a few changes were indicated in the design of these areas that would likely reduce the conflict between fishers and enforcement agencies. This kind of approach could be used as a framework for adapting conflictive MPAs or to support the establishment of new ones where fisheries are relevant. 相似文献
18.
《Marine Policy》2017
The fisheries sector is a significant contributor to the Egyptian economy. Recently, issues relating to fishing ports have been highlighted in port planning, availability of facilities, management, and environmental issues. Additional problems include Egypt's lack of specific guidelines for planning and design of fishing ports. This paper aims to assess the current status of five fishing ports (both natural and artificial) located along the Mediterranean coast of Egypt. Data were collected via a questionnaire supplied directly to the fishermen. The questionnaire contains two sections that cover information regarding the fishermen and fishing vessels. There are sections to assess the degree of satisfaction of the fishermen regarding economic, environmental, planning, facilities, and managerial issues. 250 fishermen received the questionnaire. The data were analyzed quantitatively and qualitatively. The results confirm that the fishing ports are negatively affected by a number issues, as well as management deficiencies, resulting in several weaknesses. The main issues include pollution, sedimentation, deterioration of infrastructure, and lack of port facilities. It is recommended that decision-makers should develop monitoring tools and improve infrastructure and services. Recommendations are made for future development to enable the expansion in the fishing industry and improve the sustainability of fishing ports. 相似文献
19.
根据塞拉利昂近海 16条生产船一年的生产日志资料 (1995年 7月~ 1996年 6月 ) ,分析了近海渔场渔区产值分布 ,指出 2区、4 4区、84区、97区为主要的经济渔区 ,主要渔汛时间为 6~ 8月。同时 ,还对渔获物的结构组成及渔轮的月平均单船产值进行了比较分析。 相似文献