Pub Date : 2000-10-01DOI: 10.1109/visual.2000.885710
I. Hotz, H. Hagen
One of the main research topics in scientific visualization is to "visualize the appropriate features" of a certain structure or data set. Geodesics are very important in geometry and physics, but there is one major problem which prevents scientists from using them as a visualization tool: the differential equations for geodesics are very complicated and in most cases numerical algorithms must be used. There is always a certain approximation error involved. How can you be sure to visualize the features and not only the approximation quality. The paper presents an algorithm to overcome this problem. It consists of two parts. In the first, a geometric method for the construction of geodesics of arbitrary surfaces is introduced. This method is based on the fundamental property that geodesics are a generalization of straight lines on plains. In the second part these geodesics are used to generate local nets on the surfaces.
{"title":"Visualizing geodesics","authors":"I. Hotz, H. Hagen","doi":"10.1109/visual.2000.885710","DOIUrl":"https://doi.org/10.1109/visual.2000.885710","url":null,"abstract":"One of the main research topics in scientific visualization is to \"visualize the appropriate features\" of a certain structure or data set. Geodesics are very important in geometry and physics, but there is one major problem which prevents scientists from using them as a visualization tool: the differential equations for geodesics are very complicated and in most cases numerical algorithms must be used. There is always a certain approximation error involved. How can you be sure to visualize the features and not only the approximation quality. The paper presents an algorithm to overcome this problem. It consists of two parts. In the first, a geometric method for the construction of geodesics of arbitrary surfaces is introduced. This method is based on the fundamental property that geodesics are a generalization of straight lines on plains. In the second part these geodesics are used to generate local nets on the surfaces.","PeriodicalId":237245,"journal":{"name":"Proceedings Visualization 2000. VIS 2000 (Cat. No.00CH37145)","volume":"253 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127541321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-10-01DOI: 10.1109/VISUAL.2000.885713
Jihad El-Sana
We present a novel architecture which allows rendering of a large-shared dataset at interactive rates on an inexpensive workstation. The idea is based on view-dependent rendering on a client-server network. The server stores the large dataset and manages the selection of the various levels of detail while the inexpensive clients receive a stream of update operations that generate the appropriate level of detail in an incremental fashion. These update operations are based on changes in the clients' view-parameters. Our approach dramatically reduces the amount of memory needed by each client and the entire computing system since the dataset is stored only once on the server's local memory. In addition, it decreases the load on the network as results of the incremental update contributed by view-dependent rendering.
{"title":"Multi-user view-dependent rendering","authors":"Jihad El-Sana","doi":"10.1109/VISUAL.2000.885713","DOIUrl":"https://doi.org/10.1109/VISUAL.2000.885713","url":null,"abstract":"We present a novel architecture which allows rendering of a large-shared dataset at interactive rates on an inexpensive workstation. The idea is based on view-dependent rendering on a client-server network. The server stores the large dataset and manages the selection of the various levels of detail while the inexpensive clients receive a stream of update operations that generate the appropriate level of detail in an incremental fashion. These update operations are based on changes in the clients' view-parameters. Our approach dramatically reduces the amount of memory needed by each client and the entire computing system since the dataset is stored only once on the server's local memory. In addition, it decreases the load on the network as results of the incremental update contributed by view-dependent rendering.","PeriodicalId":237245,"journal":{"name":"Proceedings Visualization 2000. VIS 2000 (Cat. No.00CH37145)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124696700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-10-01DOI: 10.1109/VISUAL.2000.885742
G. Schussman, K. Ma, D. Schissel, Todd Evans
We demonstrate the use of a combination of perceptually effective techniques for visualizing magnetic field data from the DIII-D Tokamak. These techniques can be implemented to run very efficiently on machines with hardware support for OpenGL. Interactive speeds facilitate clear communication of magnetic field structure, enhancing fusion scientists' understanding of their data, and thereby accelerating their research.
{"title":"Visualizing DIII-D Tokamak magnetic field lines","authors":"G. Schussman, K. Ma, D. Schissel, Todd Evans","doi":"10.1109/VISUAL.2000.885742","DOIUrl":"https://doi.org/10.1109/VISUAL.2000.885742","url":null,"abstract":"We demonstrate the use of a combination of perceptually effective techniques for visualizing magnetic field data from the DIII-D Tokamak. These techniques can be implemented to run very efficiently on machines with hardware support for OpenGL. Interactive speeds facilitate clear communication of magnetic field structure, enhancing fusion scientists' understanding of their data, and thereby accelerating their research.","PeriodicalId":237245,"journal":{"name":"Proceedings Visualization 2000. VIS 2000 (Cat. No.00CH37145)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123478478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-10-01DOI: 10.1109/VISUAL.2000.885712
Wei-Chao Chen, H. Towles, L. Nyland, G. Welch, H. Fuchs
In 1998 we introduced the idea for a project we call the Office of the Future. Our long-term vision is to provide a better every-day working environment, with high-fidelity scene reconstruction for life-sized 3D tele-collaboration. In particular, we want a true sense of presence with our remote collaborator and their real surroundings. The challenges related to this vision are enormous and involve many technical tradeoffs. This is true in particular for scene reconstruction. Researchers have been striving to achieve real-time approaches, and while they have made respectable progress, the limitations of conventional technologies relegate them to relatively low resolution in a restricted volume. We present a significant step toward our ultimate goal, via a slightly different path. In lieu of low-fidelity dynamic scene modeling we present an exceedingly high fidelity reconstruction of a real but static office. By assembling the best of available hardware and software technologies in static scene acquisition, modeling algorithms, rendering, tracking and stereo projective display, we are able to demonstrate a portal to a real office, occupied today by a mannequin, and in the future by a real remote collaborator. We now have both a compelling sense of just how good it could be, and a framework into which we will later incorporate dynamic scene modeling, as we continue to head toward our ultimate goal of 3D collaborative telepresence.
{"title":"Toward a compelling sensation of telepresence: demonstrating a portal to a distant (static) office","authors":"Wei-Chao Chen, H. Towles, L. Nyland, G. Welch, H. Fuchs","doi":"10.1109/VISUAL.2000.885712","DOIUrl":"https://doi.org/10.1109/VISUAL.2000.885712","url":null,"abstract":"In 1998 we introduced the idea for a project we call the Office of the Future. Our long-term vision is to provide a better every-day working environment, with high-fidelity scene reconstruction for life-sized 3D tele-collaboration. In particular, we want a true sense of presence with our remote collaborator and their real surroundings. The challenges related to this vision are enormous and involve many technical tradeoffs. This is true in particular for scene reconstruction. Researchers have been striving to achieve real-time approaches, and while they have made respectable progress, the limitations of conventional technologies relegate them to relatively low resolution in a restricted volume. We present a significant step toward our ultimate goal, via a slightly different path. In lieu of low-fidelity dynamic scene modeling we present an exceedingly high fidelity reconstruction of a real but static office. By assembling the best of available hardware and software technologies in static scene acquisition, modeling algorithms, rendering, tracking and stereo projective display, we are able to demonstrate a portal to a real office, occupied today by a mannequin, and in the future by a real remote collaborator. We now have both a compelling sense of just how good it could be, and a framework into which we will later incorporate dynamic scene modeling, as we continue to head toward our ultimate goal of 3D collaborative telepresence.","PeriodicalId":237245,"journal":{"name":"Proceedings Visualization 2000. VIS 2000 (Cat. No.00CH37145)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121557841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-10-01DOI: 10.1109/VISUAL.2000.885715
H. Garcke, T. Preußer, M. Rumpf, A. Telea, U. Weikard, J. V. Wijk
A new method for the simplification of flow fields is presented. It is based on continuous clustering. A well-known physical clustering model, the Cahn Hilliard model (J. Cahn and J. Hilliard, 1958), which describes phase separation, is modified to reflect the properties of the data to be visualized. Clusters are defined implicitly as connected components of the positivity set of a density function. An evolution equation for this function is obtained as a suitable gradient flow of an underlying anisotropic energy functional. Here, time serves as the scale parameter. The evolution is characterized by a successive coarsening of patterns: the actual clustering, and meanwhile the underlying simulation data specifies preferable pattern boundaries. The authors discuss the applicability of this new type of approach mainly for flow fields, where the cluster energy penalizes cross streamline boundaries, but the method also carries provisions in other fields as well. The clusters are visualized via iconic representations. A skeletonization algorithm is used to find suitable positions for the icons.
提出了一种新的流场简化方法。它是基于连续聚类的。著名的物理聚类模型Cahn Hilliard模型(J. Cahn and J. Hilliard, 1958)描述了相分离，该模型经过修改以反映待可视化数据的属性。聚类被隐式地定义为密度函数的正集合的连通分量。得到了该函数的演化方程，即底层各向异性能量泛函的合适梯度流。这里，时间作为尺度参数。进化的特点是模式的连续粗化:实际聚类，同时底层模拟数据指定优选的模式边界。作者主要讨论了这种新方法在流场中的适用性，在流场中，聚类能量惩罚跨流线边界，但该方法在其他领域也有规定。集群通过图标表示可视化。使用骨架化算法为图标找到合适的位置。
{"title":"A continuous clustering method for vector fields","authors":"H. Garcke, T. Preußer, M. Rumpf, A. Telea, U. Weikard, J. V. Wijk","doi":"10.1109/VISUAL.2000.885715","DOIUrl":"https://doi.org/10.1109/VISUAL.2000.885715","url":null,"abstract":"A new method for the simplification of flow fields is presented. It is based on continuous clustering. A well-known physical clustering model, the Cahn Hilliard model (J. Cahn and J. Hilliard, 1958), which describes phase separation, is modified to reflect the properties of the data to be visualized. Clusters are defined implicitly as connected components of the positivity set of a density function. An evolution equation for this function is obtained as a suitable gradient flow of an underlying anisotropic energy functional. Here, time serves as the scale parameter. The evolution is characterized by a successive coarsening of patterns: the actual clustering, and meanwhile the underlying simulation data specifies preferable pattern boundaries. The authors discuss the applicability of this new type of approach mainly for flow fields, where the cluster energy penalizes cross streamline boundaries, but the method also carries provisions in other fields as well. The clusters are visualized via iconic representations. A skeletonization algorithm is used to find suitable positions for the icons.","PeriodicalId":237245,"journal":{"name":"Proceedings Visualization 2000. VIS 2000 (Cat. No.00CH37145)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126265382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-10-01DOI: 10.1109/VISUAL.2000.885689
B. Jobard, G. Erlebacher, M. Y. Hussaini
We present a novel hardware-accelerated texture advection algorithm to visualize the motion of two-dimensional unsteady flows. Making use of several proposed extensions to the OpenGL-1.2 specification, we demonstrate animations of over 65,000 particles at 2 frames/sec on an SGI Octane with EMXI graphics. High image quality is achieved by careful attention to edge effects, noise frequency, and image enhancement. We provide a detailed description of the hardware implementation, including temporal and spatial coherence techniques, dye advection techniques, and feature extraction.
{"title":"Hardware-accelerated texture advection for unsteady flow visualization","authors":"B. Jobard, G. Erlebacher, M. Y. Hussaini","doi":"10.1109/VISUAL.2000.885689","DOIUrl":"https://doi.org/10.1109/VISUAL.2000.885689","url":null,"abstract":"We present a novel hardware-accelerated texture advection algorithm to visualize the motion of two-dimensional unsteady flows. Making use of several proposed extensions to the OpenGL-1.2 specification, we demonstrate animations of over 65,000 particles at 2 frames/sec on an SGI Octane with EMXI graphics. High image quality is achieved by careful attention to edge effects, noise frequency, and image enhancement. We provide a detailed description of the hardware implementation, including temporal and spatial coherence techniques, dye advection techniques, and feature extraction.","PeriodicalId":237245,"journal":{"name":"Proceedings Visualization 2000. VIS 2000 (Cat. No.00CH37145)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126451747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-10-01DOI: 10.1109/VISUAL.2000.885696
Steve M. F. Treavett, Min Chen
Concerns the development of non-photorealistic rendering techniques for volume visualisation. In particular, we present two pen-and-ink rendering methods, a 3D method based on non-photorealistic solid textures, and a 2/sup +/D method that involves two rendering phases in the object space and the image space respectively. As both techniques utilize volume- and image-based data representations, they can be built upon a traditional volume rendering pipeline, and can be integrated with the photorealistic methods available in such a pipeline. We demonstrate that such an integration facilitates an effective mechanism for enhancing visualisation and its interpretation.
{"title":"Pen-and-ink rendering in volume visualisation","authors":"Steve M. F. Treavett, Min Chen","doi":"10.1109/VISUAL.2000.885696","DOIUrl":"https://doi.org/10.1109/VISUAL.2000.885696","url":null,"abstract":"Concerns the development of non-photorealistic rendering techniques for volume visualisation. In particular, we present two pen-and-ink rendering methods, a 3D method based on non-photorealistic solid textures, and a 2/sup +/D method that involves two rendering phases in the object space and the image space respectively. As both techniques utilize volume- and image-based data representations, they can be built upon a traditional volume rendering pipeline, and can be integrated with the photorealistic methods available in such a pipeline. We demonstrate that such an integration facilitates an effective mechanism for enhancing visualisation and its interpretation.","PeriodicalId":237245,"journal":{"name":"Proceedings Visualization 2000. VIS 2000 (Cat. No.00CH37145)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126022251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-10-01DOI: 10.1109/VISUAL.2000.885738
P. C. Wong, Harlan Foote, L. Leung, E. Jurrus, Dan Adams, James J. Thomas
In our study of regional climate modeling and simulation, we frequently encounter vector fields that are crowded with large numbers of critical points. A critical point in a flow is where the vector field vanishes. While these critical points accurately reflect the topology of the vector fields, in our study only a subset of them is worth further investigation. We present a filtering technique based on the vorticity of the vector fields to eliminate the less interesting and sometimes sporadic critical points in a multiresolution fashion. The neighboring regions of the preserved features, which are characterized by strong shear and circulation, are potential locations of weather instability. We apply our feature filtering technique to a regional climate modeling data set covering East Asia in the summer of 1991.
{"title":"Vector fields simplification-a case study of visualizing climate modeling and simulation data sets","authors":"P. C. Wong, Harlan Foote, L. Leung, E. Jurrus, Dan Adams, James J. Thomas","doi":"10.1109/VISUAL.2000.885738","DOIUrl":"https://doi.org/10.1109/VISUAL.2000.885738","url":null,"abstract":"In our study of regional climate modeling and simulation, we frequently encounter vector fields that are crowded with large numbers of critical points. A critical point in a flow is where the vector field vanishes. While these critical points accurately reflect the topology of the vector fields, in our study only a subset of them is worth further investigation. We present a filtering technique based on the vorticity of the vector fields to eliminate the less interesting and sometimes sporadic critical points in a multiresolution fashion. The neighboring regions of the preserved features, which are characterized by strong shear and circulation, are potential locations of weather instability. We apply our feature filtering technique to a regional climate modeling data set covering East Asia in the summer of 1991.","PeriodicalId":237245,"journal":{"name":"Proceedings Visualization 2000. VIS 2000 (Cat. No.00CH37145)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128195761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-10-01DOI: 10.1109/VISUAL.2000.885734
P. Ljung, M. Dieckmann, N. Andersson, A. Ynnerman
The authors present a visualization system for interactive real time animation and visualization of simulation results from a parallel Particle-in-Cell code. The system was designed and implemented for the Onyx2 Infinite Reality hardware. A number of different visual objects, such as volume rendered particle density functionals were implemented. To provide sufficient frame rates for interactive visualization, the system was designed to provide performance close to the hardware specifications both in terms of the I/O and graphics subsystems. The presented case study applies the developed system to the evolution of an instability that gives rise to a plasma surfatron, a mechanism which rapidly can accelerate particles to very high velocities and thus be of great importance in the context of electron acceleration in astrophysical shocks, in the solar corona and in particle accelerators. The produced visualizations have allowed us to identify a previously unknown saturation mechanism for the surfatron and direct research efforts into new areas of interest.
{"title":"Interactive visualization of particle-in-cell simulations","authors":"P. Ljung, M. Dieckmann, N. Andersson, A. Ynnerman","doi":"10.1109/VISUAL.2000.885734","DOIUrl":"https://doi.org/10.1109/VISUAL.2000.885734","url":null,"abstract":"The authors present a visualization system for interactive real time animation and visualization of simulation results from a parallel Particle-in-Cell code. The system was designed and implemented for the Onyx2 Infinite Reality hardware. A number of different visual objects, such as volume rendered particle density functionals were implemented. To provide sufficient frame rates for interactive visualization, the system was designed to provide performance close to the hardware specifications both in terms of the I/O and graphics subsystems. The presented case study applies the developed system to the evolution of an instability that gives rise to a plasma surfatron, a mechanism which rapidly can accelerate particles to very high velocities and thus be of great importance in the context of electron acceleration in astrophysical shocks, in the solar corona and in particle accelerators. The produced visualizations have allowed us to identify a previously unknown saturation mechanism for the surfatron and direct research efforts into new areas of interest.","PeriodicalId":237245,"journal":{"name":"Proceedings Visualization 2000. VIS 2000 (Cat. No.00CH37145)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132834625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-10-01DOI: 10.1109/VISUAL.2000.885728
D. Weiskopf
General relativistic ray tracing is presented as a tool for gravitational physics. It is shown how standard three-dimensional ray tracing can be extended to allow for general relativistic visualization. This visualization technique provides images as seen by an observer under the influence of a gravitational field and allows to probe space-time by null geodesics. Moreover, a technique is proposed for visualizing the caustic surfaces generated by a gravitational lens. The suitability of general relativistic ray tracing is demonstrated by means of two examples, namely the visualization of the rigidly rotating disk of dust and the warp drive metric.
{"title":"Four-dimensional non-linear ray tracing as a visualization tool for gravitational physics","authors":"D. Weiskopf","doi":"10.1109/VISUAL.2000.885728","DOIUrl":"https://doi.org/10.1109/VISUAL.2000.885728","url":null,"abstract":"General relativistic ray tracing is presented as a tool for gravitational physics. It is shown how standard three-dimensional ray tracing can be extended to allow for general relativistic visualization. This visualization technique provides images as seen by an observer under the influence of a gravitational field and allows to probe space-time by null geodesics. Moreover, a technique is proposed for visualizing the caustic surfaces generated by a gravitational lens. The suitability of general relativistic ray tracing is demonstrated by means of two examples, namely the visualization of the rigidly rotating disk of dust and the warp drive metric.","PeriodicalId":237245,"journal":{"name":"Proceedings Visualization 2000. VIS 2000 (Cat. No.00CH37145)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133794699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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