高压可视化天然气水合物实验装置的研究

对高压可视化天然气水合物实验装置进行了研究.实验装置以现有天然气水合物开采方法结合水合物法海水淡化技术为研究背景,模拟海洋环境;利用水合物技术原位制备热盐水,开采海洋天然气水合物;采用可视化技术,可观察到水合物晶体状态.实际应用表明,该装置达到了设计效果,同时还可以应用到海水淡化等领域.     

基于WebGIS的海水淡化工程空间信息可视化应用研究

针对海水淡化工程空间信息共享与可视化服务需求,本文借鉴WebGIS在海洋信息可视化领域的先进理念和成功经验,研究建立海水淡化工程空间数据库,设计开发海水淡化工程空间信息可视化系统。系统实现了地图浏览、专题查询及统计分析等功能,能够为用户及时、准确掌握海水淡化工程相关属性信息与空间信息提供一定支撑。     

海洋牧场信息管理系统数字化的设计与实现

进入21世纪以来,海洋在全球发展中的战略地位显著提升,海洋牧场建设成为引领世界新技术革命、发展低碳经济的一个重要载体。开发一个合理有效的海洋牧场管理系统有助于提高海洋牧场的管理水平。本文介绍了海洋牧场的发展与现状,分析数字化海洋牧场管理系统开发的迫切需要。在前人研究基础上,通过研究和查阅资料,开发了基于ArcGIS Engine的数字化海洋牧场管理系统,实现了海洋牧场信息的录入和查询功能,为数字化海洋牧场建设提供了技术支持。     

基于波浪能的海洋牧场环境监测系统设计

针对目前东海沿岸地区海洋牧场建设过程中的传统、落后、低效、信息化程度低等问题,从物联网搭建、设备供电、信息平台设计三方面入手,提出了一种基于波浪能的海洋牧场环境监测系统的设计方案。该方案结合了当地养殖环境和养殖方式的特点,具备较强的可复制性,希望能在一定程度上推动传统海洋牧场向数字化、信息化、智能化发展,提升海水养殖产业水平,促进东海沿岸地区的渔业产业转型升级。     

基于IDL的海洋中尺度现象可视化方法

基于遥感平台对海洋中尺度现象研究的一项重要工作就是对测量结果进行可视化.为此,针对海洋中尺度现象的具体特点,利用IDL对其进行了可视化应用开发研究.开发过程及得到的可视化产品表明IDL为进行海洋中尺度现象研究提供了一个友好、灵活、简便、有效的开发环境,用其进行遥感可视化,可取得色彩细腻、定制随意的图形效果.     

一种海洋温度和盐度的虚拟生成方法

海洋温度和盐度精确仿真的主要难点是实际实验数据的获得成本高且操作不便,根据有限的实验数据对温度和盐度进行仿真,对研究它们对水下机器人声纳系统及载体控制系统的影响具有重要意义。针对UUV多水下机器人的数字仿真平台的具体工程提出了一种海洋温度和盐度的虚拟生成方法。对海洋中海水的温度和盐度分别进行仿真:水平面采用二元全区间插值方法,垂直面的仿真分为两种情况:对于已有实验数据深度范围内的温度和盐度数值采用三次样条插值,而对于未知实验数据深度范围内的温度和盐度数值采用曲线拟合的方法来近似获得,方法能适用于普遍海域的温度和盐度的虚拟生成,为研究海洋温度和盐度对海洋生物或水下工程的研究提供参考。     

基于Python的海洋气象数据可视化技术研究

针对现有可视化方法在展示海洋气象数据时,存在可视化覆盖范围小、可视化数据量少的问题,文章提出基于Python的海洋气象数据可视化技术研究。对来自不同数据源、不同类型、不同格式的多源异构海洋气象数据,采用清洗、格式转换等方式实现同一化处理;绘制海洋气象数据体,并对其进行三维立体分割;利用Python技术,实现非结构化数据与结构化数据的可视化展现。实验结果表明,所提可视化方法可以实现对更大范围、更多数量的海洋气象数据的展示,具备更加理想的可视化效果。     

海洋牧场多参数智能监测系统设计与实现

针对南海水产养殖业特点,设计了一种海洋牧场多参数智能监测系统.选取温度、pH值和浊度作为监测对象,利用单片机收集水下传感器数据,通过低频信号发射模块传输数据,通过ZigBee技术自动组网实现水上数据远程传输,上位机利用LabVIEW图形化编程实现对海水生态参数的实时监测,并提供远程访问功能.外场测试证明:系统具有灵活性好、功耗低、成本低等特点,可以较好地用于海洋牧场水质监测,全面提升海洋牧场的科学化监管和告警等管理.     

海洋牧场鱼类驯化中的声音监测系统设计

采用鱼类所发声音进行海洋牧场中鱼类生活规律驯化可望提高驯化效率;根据海洋牧场中相对开放式环境的要求进行了声音监测系统设计,重点考虑了鱼类自然声音声压变化情况下水听器的分布式使用和数据采集方法,定义了过强信号作用区域和最远有效作用区域的概念,为设计科学有效的声音监测系统提供参考;利用RHS-15水听器进行检测,获得了幅值和频率变化情况下小信号水下声压的有效检测方法。     

基于非结构化三角网格的流场可视化研究

FVCOM是一种被广泛应用的非结构化三角网格海洋数值模型,基于非结构化三角网格的海洋流场数据可视化对于分析海流的动态变化规律和研究海洋环境具有重要意义。论文通过分析FVCOM模拟产生的海洋流场数据,根据网格的面积和临界点进行粒子均匀随机化。在AMFCA算法的基础上添加视角像素参数,同时提出根据网格的面积大小采用局部步长进行轨迹计算。论文针对非结构化三角网格提出通过边列表进行点定位方法。在Cesium引擎下,采用基于动态粒子的流场可视化方法,使用WebGL对粒子运动轨迹进行渲染,实现了基于非结构化三角网格的流场可视化应用。现已实现对FVCOM数据进行流畅且准确的流场可视化,可基于本地服务器运行。     

Mapping the royal road and other hierarchical functions

In this paper we present a technique for visualising hierarchical and symmetric, multi-modal fitness functions that have been investigated in the evolutionary computation literature. The focus of this technique is on landscapes in moderate-dimensional, binary spaces (i.e., fitness functions defined over [0,1](n), for n < or = 16). The visualisation approach involves an unfolding of the hyperspace into a two-dimensional graph, whose layout represents the topology of the space using a recursive relationship, and whose shading defines the shape of the cost surface defined on the space. Using this technique we present case-study explorations of three fitness functions: royal road, hierarchical-if-and-only-if (H-IFF), and hierarchically decomposable functions (HDF). The visualisation approach provides an insight into the properties of these functions, particularly with respect to the size and shape of the basins of attraction around each of the local optima.     

Visualisation and animation in a CAL package: anchors or misconceptions?

Abstract Various studies have shown that visualisation and animation in CAL packages offer students with effective 'conceptual anchors' to hook their thinking onto. This paper examines the role of these visual representations of a CAL package in an economics course, and argues for the design and organisation of instructional activities to exploit the cognitive opportunities and address the limitations of these representations. In other words, a holistic approach to visualisation and animation is required to serve as conceptual anchors rather than sources of misconceptions.     

Transition to canonical principal parameters on minimal surfaces

Ganchev has recently proposed a new approach to minimal surfaces. Introducing canonical principal parameters for these surfaces, he has proved that the normal curvature determines the surface up to its position in the space. Here we prove a theorem that permits to obtain equations of a minimal surface in canonical principal parameters and we make some applications on parametric polynomial minimal surfaces. Thus we show that Ganchev's approach implies an effective method to prove the coincidence of two minimal surfaces given in isothermal coordinates by different parametric equations.     

MLP Based Linear Fea ure Ex rac ion for Nonlinearly Separable Data

A novel approach to linear feature extraction is presented. Most supervised feature extraction algorithms use mean square error or other measures based on the difference between expected and actual output values as a performance criterion. The novel approach presented here uses data visualisation together with an empirical classification error (percentage of cases classified incorrectly) as performance criterion. To find the optimal data transformation weights, the Multilayer Perceptron cost function with a special regularisation term is applied. The technique proposed is verified and compared with five competing mapping techniques with respect to visualisation and different classification error criteria. For comparison, two artificial and 12 real world data sets are used.     

Study of emissivity scaling and relativity of homogeneity of surface temperature

Three definitions of emissivity for non-isothermal pixels are evaluated, and their differences are analysed. On the basis of the experimental data and numerical simulation, a generalized formula is established to scale for land surface emissivity, reflectance, and other variables between pixel scale and sub-pixel scale. Finally, it is pointed out that isothermal concept of land surface temperature and homogeneous concept of some other parameters in one spatial scale are relative according to humans' capability of measurement, and that the heterogeneity in a spatial scale is absolute in the natural world.     

Visual Analysis of Multi‐Joint Kinematic Data

Kinematics is the analysis of motions without regarding forces or inertial effects, with the purpose of understanding joint behaviour. Kinematic data of linked joints, for example the upper extremity, i.e. the shoulder and arm joints, contains many related degrees of freedom that complicate numerical analysis. Visualisation techniques enhance the analysis process, thus improving the effectiveness of kinematic experiments. This paper describes a new visualisation system specifically designed for the analysis of multi‐joint kinematic data of the upper extremity. The challenge inherent in the data is that the upper extremity is comprised of five cooperating joints with a total of fifteen degrees of freedom. The range of motion may be affected by subtle deficiencies of individual joints that are difficult to pinpoint. To highlight these subtleties our approach combines interactive filtering and multiple visualisation techniques. Our system is further differentiated by the fact that it integrates simultaneous acquisition and visual analysis of biokinematic data. Also, to facilitate complex queries, we have designed a visual query interface with visualisation and interaction elements that are based on the domain‐specific anatomical representation of the data. The combination of these techniques form an effective approach specifically tailored for the investigation and comparison of large collections of kinematic data. This claim is supported by an evaluation experiment where the technique was used to inspect the kinematics of the left and right arm of a patient with a healed proximal humerus fracture, i.e. a healed shoulder fracture.     

In situ ray tracing and computational steering for interactive blood flow simulation

Recent algorithm and hardware developments have significantly improved our capability to interactively visualise time-varying flow fields. However, when visualising very large dynamically varying datasets interactively there are still limitations in the scalability and efficiency of these methods. Here we present a rendering pipeline which employs an efficient in situ ray tracing technique to visualise flow fields as they are simulated. The ray casting approach is particularly well suited for the visualisation of large and sparse time-varying datasets, where it is capable of rendering fluid flow fields at high image resolutions and at interactive frame rates on a single multi-core processor using OpenMP. The parallel implementation of our in situ visualisation method relies on MPI, requires no specialised hardware support, and employs the same underlying spatial decomposition as the fluid simulator. The visualisation pipeline allows the user to operate on a commodity computer and explore the simulation output interactively. Our simulation environment incorporates numerous features that can be utilised in a wide variety of research contexts.     

Improved Visualisation of Marine Data: Algae and Acid Rain

Recent studies have shown a connection between seasonal phytoplankton activity and generation of atmospheric sulphur products known to contribute towards acid rain [1]. Although anthropogenic sources of sulphur dioxide and sulphate dominate in acid &position on land surfaces, for some less industrialised areas of Europe, during the summer, there may be a significant contribution from natural marine sources. This paper describes briefly the nature of the marine processes thought to be taking place and survey cruises in the Southern North Sea used to collect data. Such field studies pose peculiar difficulties in both collection and processing of data. A critique on the nature of data generated under such conditions is included and some implications drawn for visualisation and interpretation techniques. Some initial results, with basic interpolation and approximation techniques, are compared. The paper concludes with suggestions on the way in which the research projects described are intended to befurther developed.