Material driven workability simulation by FEM including 3D processing maps for magnesium alloy

The three-dimensional （3D） processing maps considering strain based on the two-dimensional （2D） processing maps proposed by PRASAD can describe the distribution of the efficiency of power dissipation and flow instability regions at various temperatures, strain rates and strains, which exhibit intrinsic workability related to material itself. Finite element （FE） simulation can obtain the distribution of strain, strain rate, temperature and die filling status, which indicates state-of-stress （SOS） workability decided by die shape and different processing conditions. On the basis of this, a new material driven analysis method for hot deformation was put forward by the combination of FE simulation with 3D processing maps, which can demonstrate material workability of the entire hot deformation process including SOS workability and intrinsic workability. The hot forging process for hard-to-work metal magnesium alloy was studied, and the 3D thermomechanical FE simulation including 3D processing maps of complex hot forging spur bevel gear was first conducted. The hot forging experiments were carried out. The results show that the new method is reasonable and suitable to determine the aoorooriate nrocess narameters.

Analysis of Tidal Current Energy Potential in the Major Channels of the Bohai Strait Based on Delft3D

The utilization and development of tidal current energy can help alleviate the current energy shortage,improve the global ecological environment,and maintain sustainable development.In this study,numerical simulation is carried out on a rectangular grid using Delft3D.The tidal current energy potential of the major channels in the Bohai Strait is further simulated and estimated by comparing the simulated and measured data.Results show that the flow module in Delft3D has good modeling ability for the assessment of tidal current energy potential.The average flow velocity,maximum flow velocity,and energy flow density are consistent.The Laotieshan Channel,located in the northern part of the Bohai Strait,shows a large tidal current energy potential.The maximum flow velocity of this channel can reach 2 m s-1,and the maximum energy flow density can exceed 500 W m-2.The tidal current energy in the Laotieshan Channel is more than 10 times that in other channels.Therefore,this study advocates for the continued exploration and exploitation of the tidal current energy resources in the Laotieshan Channel.

3D Ice Shape Description Method Based on BLSOM Neural Network

When checking the ice shape calculation software,its accuracy is judged based on the proximity between the calculated ice shape and the typical test ice shape.Therefore,determining the typical test ice shape becomes the key task of the icing wind tunnel tests.In the icing wind tunnel test of the tail wing model of a large amphibious aircraft,in order to obtain accurate typical test ice shape,the Romer Absolute Scanner is used to obtain the 3D point cloud data of the ice shape on the tail wing model.Then,the batch-learning self-organizing map(BLSOM)neural network is used to obtain the 2D average ice shape along the model direction based on the 3D point cloud data of the ice shape,while its tolerance band is calculated using the probabilistic statistical method.The results show that the combination of 2D average ice shape and its tolerance band can represent the 3D characteristics of the test ice shape effectively,which can be used as the typical test ice shape for comparative analysis with the calculated ice shape.

Securing 3D Point and Mesh Fog Data Using Novel Chaotic Cat Map

With the rapid evolution of Internet technology,fog computing has taken a major role in managing large amounts of data.The major concerns in this domain are security and privacy.Therefore,attaining a reliable level of confidentiality in the fog computing environment is a pivotal task.Among different types of data stored in the fog,the 3D point and mesh fog data are increasingly popular in recent days,due to the growth of 3D modelling and 3D printing technologies.Hence,in this research,we propose a novel scheme for preserving the privacy of 3D point and mesh fog data.Chaotic Cat mapbased data encryption is a recently trending research area due to its unique properties like pseudo-randomness,deterministic nature,sensitivity to initial conditions,ergodicity,etc.To boost encryption efficiency significantly,in this work,we propose a novel Chaotic Cat map.The sequence generated by this map is used to transform the coordinates of the fog data.The improved range of the proposed map is depicted using bifurcation analysis.The quality of the proposed Chaotic Cat map is also analyzed using metrics like Lyapunov exponent and approximate entropy.We also demonstrate the performance of the proposed encryption framework using attacks like brute-force attack and statistical attack.The experimental results clearly depict that the proposed framework produces the best results compared to the previous works in the literature.

MAP7D3在头颈部鳞状细胞癌中的作用探讨

目的:利用生物信息学方法探讨MAP7D3在头颈部鳞癌(HNSCC)中的表达水平、诊断及预测预后价值,初步探索MAP7D3表达水平改变对HNSCC细胞系生物学行为的影响。方法:利用生物信息学方法,在HNSCC中对MAP7D3进行表达分析、临床病理特征相关性分析、生存分析、Cox回归分析、ROC曲线分析及基因集富集分析。使用qRT-PCR、免疫组织化学染色法检测MAP7D3在HNSCC细胞系(WSU-HN6、CAL27)及癌组织中的表达。通过转染siRNA敲低MAP7D3的表达,利用qRT-PCR验证MAP7D3的敲低效果,应用CCK-8、流式凋亡实验、划痕实验、Transwell实验检测MAP7D3表达对WSU-HN6和CAL27增殖、凋亡、迁移、侵袭等生物学行为的影响。结果:生物信息学分析、qRT-PCR及免疫组织化学染色表明,在HNSCC中,MAP7D3 mRNA及蛋白质水平均呈高表达。临床相关性分析发现,MAP7D3的表达水平与病理分级相关。与MAP7D3低表达患者相比,MAP7D3高表达患者总体生存期、疾病别生存期及无进展间隔期均更短。单因素及多因素Cox回归分析显示,MAP7D3可作为HNSCC患者预后的独立危险因素。ROC曲线显示,MAP7D3在HNSCC的诊断中具有一定意义。根据GSEA分析结果,MAP7D3高表达组在包括局灶黏附、ECM-受体间相互作用的多条途径中富集。CCK-8、流式凋亡实验、划痕实验及Transwell侵袭实验表明,当MAP7D3表达下调时,细胞增殖、迁移和侵袭能力均受到抑制,细胞凋亡增加。结论:MAP7D3在头颈部鳞癌中高表达,可作为头颈部鳞癌潜在的诊断及预后生物标志物。敲低MAP7D3,能抑制头颈部鳞癌细胞增殖、迁移、侵袭,促进细胞凋亡。

Effects of simulated zero gravity on adhesion,cell structure,proliferation,and growth behavior,in glioblastoma multiforme

All life on Earth has evolved under the influence of continuous gravity,and methods have been developed to balance this influence with the biological evolution of organisms at the cellular and system levels.However,when exposed to zero gravity in space,the balance between cell structure and external forces is destroyed,resulting in changes at the cellular level(e.g.,cell morphology,adhesion,viability,apoptosis,etc.),and understanding the molecular mechanism of cell response to zero gravity will help to cope with diseases that rely on mechanical response.Therefore,biological research in space and zero gravity is a unique step in developing the best anti-cancer treatments,which is a great challenge to humanity.In this study,multicellular glioma cancer cells from a brain tumor in a 72-year-old Iraqi patient were subjected to simulated zero gravity for 24 h,and the results showed that most of the cells lost their adhesion,which is considered to be the first step toward cell apoptosis.In addition to the formation of multicellular spheroids,the results also showed that the inhibition rate for cell death was 32%in comparison to the control cells.Moreover,the cells showed a clear change in their cellular morphology and growth behavior.These results give new hope for fighting cancer distinctively,and such a treatment method has no side effects in comparison to traditional chemical and radiological ones.

An Improved High Precision 3D Semantic Mapping of Indoor Scenes from RGB-D Images

This paper proposes an improved high-precision 3D semantic mapping method for indoor scenes using RGB-D images.The current semantic mapping algorithms suffer from low semantic annotation accuracy and insufficient real-time performance.To address these issues,we first adopt the Elastic Fusion algorithm to select key frames from indoor environment image sequences captured by the Kinect sensor and construct the indoor environment space model.Then,an indoor RGB-D image semantic segmentation network is proposed,which uses multi-scale feature fusion to quickly and accurately obtain object labeling information at the pixel level of the spatial point cloud model.Finally,Bayesian updating is used to conduct incremental semantic label fusion on the established spatial point cloud model.We also employ dense conditional random fields(CRF)to optimize the 3D semantic map model,resulting in a high-precision spatial semantic map of indoor scenes.Experimental results show that the proposed semantic mapping system can process image sequences collected by RGB-D sensors in real-time and output accurate semantic segmentation results of indoor scene images and the current local spatial semantic map.Finally,it constructs a globally consistent high-precision indoor scenes 3D semantic map.

3D Mapping在媒体中的应用现状及发展趋势

3D Mapping是当今极具发展前景的裸眼3D表现形式之一,3D Mapping技术的运用,改变了传统二维艺术表现形式,它以新的视觉语言创造出不一样的动画视觉体验效果和艺术感受。本文通过分析目前3D Mapping技术在媒体中的应用现状、媒体应用中的突出特点与不足之处以及3DMapping在艺术创作中思维方式的转变,探讨了未来发展趋势。以求在未来应用中,为我们的艺术创作与发展有所启发。

基于某商业办公楼外立面户外投影(3D MAPPING)中的应用分析

城市亮化又叫城市光彩工程。可以极大地提高城市的整体形象,夜晚城市照亮了,很多人可以出来玩耍、购物、休闲,这也会拉动整个城市的经济发展。其目标在于解读城市与人文的关系,展现城市存在文化性的价值,创造一种形象,彰显城市的个性、利用灯光结合投影实现城市形象语言的吸引力。本文从某商业办公楼外立面户外投影工程项目实践中出发,去探析户外投影在未来智能建筑与智慧城市发展中的具体设计应用,以及户外建筑投影(3D MAPPING)未来的发展趋势。

Research on the Application of Virtual Simulation and 3D Animation Technology in the Teaching of Road and Bridge Majors in Higher Vocational Colleges

The informatization of higher vocational education is the future development trend,and it is also encouraged and promoted by the Ministry of Education.This article focuses on the road and bridge major,combined with the author’s experience in introducing virtual simulation and three-dimensional(3D)animation technology into relevant course teaching in recent years,discusses the application of virtual simulation and 3D animation technology in higher vocational education and promotes classroom revolution,to obtain better teaching effect.

Self-similarity Based Editing of 3D Surface Textures Using Height and Albedo Maps

This paper presents an inexpensive method for self-similarity based editing of real-world 3D surface textures by using height and albedo maps. Unlike self-similarity based 2D texture editing approaches which only make changes to pixel color or inten- sity values, this technique also allows surface geometry and reflectance of the captured 3D surface textures to be edited and relit us- ing illumination conditions and viewing angles that differ from those of the original. A single editing operation at a given location affects all similar areas and produces changes on all images of the sample rendered under different conditions. Since surface height and albedo maps can be used to describe seabed topography and geologic features, which play important roles in many oceanic proc- esses, the proposed method can be effectively employed in applications regarding visualization and simulation of oceanic phenom- ena.

Linking a Simulated Annealing Based Optimization Model with PHT3D Simulation Model for Chemically Reactive Transport Processes to Optimally Characterize Unknown Contaminant Sources in a Former Mine Site in Australia

Historical mining activities often lead to continuing wide spread contaminants in both groundwater and surface water in previously operational mine site areas. The contamination may continue for many years after closing down the mining activities. The essential first step for sustainable management of groundwater and development of remediation strategies is the unknown contaminant source characterization. In a mining site, there are multiple species of contaminants involving complex geochemical processes. It is difficult to identify the potential sources and pathways incorporating the chemically reactive multiple species of contaminants making the source characterization process more challenging. To address this issue, a reactive transport simulation model PHT3D is linked to a Simulated Annealing based the optimum decision model. The numerical simulation model PHT3D is utilized for numerically simulating the reactive transport process involving multiple species in the former mine site area. The simulation results from the calibrated PHT3D model are illustrated, with and without incorporating the chemical reactions. These comparisons show the utility of using a reactive, geochemical transport process’ simulation model. Performance evaluation of the linked simulation optimization methodology is evaluated for a contamination scenario in a former mine site in Queensland, Australia. These performance evaluation results illustrate the applicability of linked simulation optimization model to identify the source characteristics while using PHT3D as a numerical reactive chemical species’ transport simulation model for the hydro-geochemically complex aquifer study area.

Influence of Adoptment of Geocentric 3D Coordinate System on Chinese Existent Maps

If a geocentric 3D coordinate system is adopted in China to replace 2D non-geocentric coordinate system, the coordinates of the surface points will be changed accordingly. The influences on the current maps of China, especially the topographic maps, are discussed due to the replacement of the coordinate systems. Taking the replacement of Xi’an 80 coordinate system by GRS80 for a numerical example, this paper analyzes the changes of latitude, longitude, Gauss plane coordinates of the surface points, as well as the orientation and the length changes between the points on the map, including the changes of map border lines and sheet corner points.

3DV quality model based depth maps for view synthesis in FTV system

Depth maps are used for synthesis virtual view in free-viewpoint television （FTV） systems. When depth maps are derived using existing depth estimation methods, the depth distortions will cause undesirable artifacts in the synthesized views. To solve this problem, a 3D video quality model base depth maps （D-3DV） for virtual view synthesis and depth map coding in the FTV applications is proposed. First, the relationships between distortions in coded depth map and rendered view are derived. Then, a precisely 3DV quality model based depth characteristics is develop for the synthesized virtual views. Finally, based on D-3DV model, a multilateral filtering is applied as a pre-processed filter to reduce rendering artifacts. The experimental results evaluated by objective and subjective methods indicate that the proposed D-3DV model can reduce bit-rate of depth coding and achieve better rendering quality.

基于AutoDesk Map 3D的土方量计算

为了提高土方量计算的精度及效率,文中提出了基于AutoDesk Map 3D的土方量计算方法.该方法是以AutoDesk Map 3D作为软件开发平台,建立土方量计算原始表面与设计表面的精确地形模型,计算两个曲面之间的组合体积来实现土方量的计算.文中通过对比分析提出了采用混合表示节点及三角形邻接关系的数据结构,建立狄洛尼三角网,然后通过加入约束条件建立带约束条件的狄洛尼三角网来模拟地形模型.根据提出的算法编写程序代码,利用VBA对系统进行开发,生成工程文件,然后加载到Autodesk Map 3D软件平台,建立计算土方量模块.

玩转3D地图——微软3D Maps全接触

各大搜寻器均提供网上地图服务。然而所提供的服务实在太相似。Microsoft就在这方面追求突破，在其Live Search内的Maps功能中，提供与别不同的3D地图服务。 微软Live Search功能下提供多项服务，用户在选择“Maps”选项后便可开始搜寻地址，按“3DMaps”按钮时系统会通知用户安装外挂程序。程序安装完毕后，再进入Live Search网站，首先你需要进行3项初始化设定，用户可以选择三维、一般及最佳三类效果类型，T3建议大家选择最佳效果选项，以便在地图中显示建筑物的完整外貌。之后用户就可以按“Ctrl”键，并通过移动鼠标来平移地图。 在浏览立体地图时，地图浏览器左半部分可以支持立体显示的地点，用户只要点击地点，地图浏览器便会显示该地点的立体地图。现在，你可以试着靠近建筑物，居然可以清楚的看到建筑物门窗哟，而运动场的纹理也清晰可见。

Temperature Distributions in Single Cell of Polymer Electrolyte Fuel Cell Simulated by an 1D Multi-plate Heat-Transfer Model and a 3D Numerical Simulation Model

The purpose of this study is to verify an 1D multi-plate heat-transfer model estimating the temperature distribution on the interface between polymer electrolyte membrane and catalyst layer at cathode in single cell of polymer electrolyte fuel cell, which is named as reaction surface in this study, with a 3D numerical simulation model solving many governing equations on the coupling phenomena in the cell. The results from both models/simulations agreed well. The effects of initial operation temperature, flow rate, and relative humidity of supply gas on temperature distribution on the reaction surface were also investigated. It was found in both 1D and 3D simulations that, the temperature rise （i.e., Treact-Tini） of the reaction surface from initial operation temperature at 70℃ was higher than that at 80℃ irrespective of flow rate of supply gas. The effect of relative humidity of supply gas on Treact- Tini near the inlet of the cell was small. Compared to the previous studies conducted under the similar operation conditions, the Treact - Tini calculated by 1D multi-plate heat-transfer model in this study as well as numerical simulation using 3D model was reasonable.

基于AutoDesk Map 3D的DTM建立及等高线绘制研究

介绍利用递归生长法、凸闭包收缩、分割-归并法相结合的算法快速生成TIN,并以断裂线、地性线、建筑物边界为约束条件,最终生成具有约束的不规则三角网。然后,以点文件数据为原始数据,基于AutoDesk Map 3D基础软件和上述算法,通过二次开发功能,使生成的地形模型得到优化,并自动绘制等高线图。

Autodesk Map 3D在地理基础数据采集中的应用

Autodesk Map 3D具有为专业制图员和地理信息系统(GIS)专业人士进行设计的功能强大的制图功能,它可以作为GIS前端数据采集软件。介绍Autodesk Map 3D 2005及其在采集DTM、等高线地理基础数据方面的应用,并以点文件为数据源,介绍DTM的建立、等高线的绘制、DTM编辑及特征线的应用。

MRI T_2 star mapping、T_1 images与3D DESS融合图在隐匿性膝关节软骨损伤中的应用

目的探讨T_2 star mapping、T_1 images与3D DESS融合伪彩图在关节软骨损伤中的诊断价值。方法对26例关节软骨损伤患者行T_2 star mapping、T_1 images和3D DESS扫描,并将T_1 images、T_2 star mapping与3D DESS图像融合,评价患者股骨、胫骨、髌骨关节软骨损伤程度并与关节镜结果对比,计算融合伪彩图诊断软骨损伤的特异性、敏感性及与关节镜诊断结果一致性。结果 T_1 images-3D DESS融合伪彩图诊断关节软骨损伤的敏感度、特异度及Kappa值分别为92.8%、93.0%、0.769,T_2 star mapping-3D DESS融合伪彩图诊断关节软骨损伤的敏感度、特异度及Kappa值分别为91.4%、94.2%、0.787。结论 T_2 star mapping、T_1 images与3D DESS融合伪彩图在关节软骨早期损伤评价上优于关节镜。