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Characteristics of the recirculation zone in a cylindrical confined space and its suppression by an annular orifice plate

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Building Simulation 2023年第8期16卷 1391-1408页

作者： Yu Zhou Wan-Rong Ren Mengfan Quan Lei Jia manning wang Yi wang State Key Laboratory of Green Building in Western China Xi'an University of Architecture and TechnologyXi'an 710055China School of Building Services Science and Engineering Xi’an University of Architecture and TechnologyNo.13 Yanta RD.Xi’an 710055China

The accumulation of pollutants in the recirculation zone can worsen *** is critical to reduce recirculation zones to improve the ventilation efficiency of ***,the variation rule of the recirculation zone in a cylindrical confined space(CCS)is unclear,and there are few solutions to suppress or eliminate the recirculation zone at *** this paper,an annular deflector orifice plate for suppressing the recirculation zone was developed based on the structural characteristics of the *** device is simple in structure and can be used *** experiments and numerical simulations,the variation rule of the recirculation zone length and the influence of structural parameters of the device on the vortex suppression were ***,empirical formulas for calculating the length of the recirculation zone in the CCS were *** addition,it was proved that placing the annular orifice plate inside the CCS effectively reduced the recirculation zone and improved the ventilation *** to the system without the annular orifice plate,the dimensionless length of the recirculation zone was decreased by 76.3%,and the time to completely discharge the pollutants from the CCS was decreased by 16.7%.Finally,parameters of the annular orifice plate that form the best vortex suppression effect were proposed:the porosity range was 40%–50%,uniform in shape with equal ring spacing,and placed more than one inlet diameter away from the *** results help guide the ventilation design of CCS.

关键词： cylindrical confined space recirculation zone vortex suppression orifice plate

SS-Pro:a simplified siamese contrastive learning approach for protein surface representation

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Frontiers of Computer Science 2024年第5期18卷 243-245页

作者： Ao SHEN Mingzhi YUAN Yingfan MA manning wang Digital Medical Research Center School of Basic Medical ScienceFudan UniversityShanghai 200032China Shanghai Key Laboratory of Medical Image Computing and Computer Assisted Intervention Shanghai 200032China

Protein surface serves as an important representation of protein structure,revealing how protein interacts with other biomolecules to perform its *** forms the basis for pharmaceutical and fundamental biological research[1].Datadriven deep learning methods in protein surface representation face challenges of label scarcity,since labeled data are typically obtained through wet lab experiments.

关键词： revealing representation simplified

A learnable self-supervised task for unsupervised domain adaptation on point cloud classification and segmentation

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Frontiers of Computer Science 2023年第6期17卷 147-149页

作者： Shaolei LIU Xiaoyuan LUO Kexue FU manning wang Zhijian SONG Shanghai Key Laboratory of Medical Image Computing and Computer Assisted Intervention Shanghai 200032China Digital Medical Research Center School of Basic Medical ScienceFudan UniversityShanghai 200032China

1 Introduction Deep neural networks have exhibited excellent performance in supervised tasks on point clouds,such as classification,segmentation[1]and registration[2].In supervised learning schemes,manual labeling of massive point clouds is needed for model ***,point clouds captured from different scenarios exist inevitable distribution discrepancy,and model trained from one domain always generalize badly in another *** reduce the doamin distribution discrepancy,many studies[3–6]have emerged for point cloud unsupervised domain adaptation(UDA)by learning domain-invariant features,where[5]proposed using adaptive nodes to align the local features between the source and the target domains[3,4],and[6]proposed utilizing self-supervised tasks to help capture highly transferable feature representations.

关键词： point cloud utilizing

Plasma membrane-localized SlSWEET7a and SlSWEET14 regulate sugar transport and storage in tomato fruits

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Horticulture Research 2021年第1期8卷 2375-2390页

作者： Xinsheng Zhang Chaoyang Feng manning wang Tianlai Li Xin Liu Jing Jiang College of Horticulture Shenyang Agricultural University110866 ShenyangLiaoningChina Key Laboratory of Protected Horticulture of Education Ministry 110866 ShenyangLiaoningChina These authors contributed equally:Xinsheng ZhangChaoyang Feng

Sugars,especially glucose and fructose,contribute to the taste and quality of tomato *** compounds are translocated from the leaves to the fruits and then unloaded into the fruits by various sugar transporters at the plasma ***,are sugar transporters that regulate sugar efflux independently of energy or *** date,the role of SWEETs in tomato has received very little *** this study,we performed functional analysis of SlSWEET7a and SlSWEET14 to gain insight into the regulation of sugar transport and storage in tomato ***7a and SlSWEET14 were mainly expressed in peduncles,vascular bundles,and *** SlSWEET7a and SlSWEET14 are plasma membrane-localized proteins that transport fructose,glucose,and *** from the resulting increase in mature fruit sugar content,silencing SlSWEET7a or SlSWEET14 resulted in taller plants and larger fruits(in SlSWEET7a-silenced lines).We also found that invertase activity and gene expression of some SlSWEET members increased,which was consistent with the increased availability of sucrose and hexose in the ***,our results demonstrate that suppressing SlSWEET7a and SlSWEET14 could be a potential strategy for enhancing the sugar content of tomato fruits.

关键词： SWEET1 sugar Sugar

Diffusion tensor imaging fiber tracking with reliable tracking orientation and flexible step size

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Neural Regeneration Research 2013年第16期8卷 1481-1490页

作者： Xufeng Yao manning wang Xinrong Chen Shengdong Nie Zhexu Li Xiaoping Xu Xuelong Zhang Zhijian Song Shanghai Medical Instrument College School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Digital Medical Research Center Shanghai Medical School Fudan University/The Key Laboratory of MICCAI of Shanghai

We propose a method of reliable tracking orientation and flexible step size fiber tracking. A new directional strategy was defined to select one optimal tracking orientation from each directional set, which was based on the single-tensor model and the two-tensor model. The directional set of planar voxels contained three tracking directions： two from the two-tensor model and one from the single- tensor model. The directional set of linear voxels contained only one principal vector. In addition, a flexible step size, rather than fixable step sizes, was implemented to improve the accuracy of fiber tracking. We used two sets of human data to assess the performance of our method; one was from a healthy volunteer and the other from a patient with low-grade glioma. Results verified that our method was superior to the single-tensor Fiber Assignment by Continuous Tracking and the two-tensor eXtended Streamline Tractography for showing detailed images of fiber bundles.

关键词： neural regeneration neuroimaging fiber tracking two-tensor model single-tensor model flexiblestep size tracking orientation fiber bundles diffusion tensor imaging grants-supported paper neuroregeneration

脊柱手术导航中分步式2D/3D图像配准方法

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计算机辅助设计与图形学学报 2007年第9期19卷 1154-1158,1165页

作者：张翼王满宁宋志坚复旦大学数字医学研究中心上海200032

为实现微创脊柱手术导航,提出一种将脊柱术前CT与其术中X射线图像配准的方法.首先基于一种最近点迭代法进行快速粗配准;然后提取图像的梯度特征,根据投影变换原理,采用寻找具有CT最大梯度投影位置的方法进行精配准.在模拟数据及临床标... 详细信息

为实现微创脊柱手术导航,提出一种将脊柱术前CT与其术中X射线图像配准的方法.首先基于一种最近点迭代法进行快速粗配准;然后提取图像的梯度特征,根据投影变换原理,采用寻找具有CT最大梯度投影位置的方法进行精配准.在模拟数据及临床标本上进行实验的配准率分别为92%和78%.实验结果表明:该方法鲁棒性强、人工干预少、适合于临床应用.

关键词： 2D/3D配准数字X射线图像计算机断层扫描手术导航

基于场所精神理论下的民俗风情街设计策略研究

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陶瓷 2024年第9期 198-200页

作者：王曼凝北方工业大学北京100144

民俗风情街作为区别于传统商业街的特殊街道类型,因其能反映地域文化且具有一定美学价值,满足了人们对多元文化的需求而备受关注。经调研发现,目前风情街面临多种困境,为改善该局面,笔者通过整理现有文献,深入分析不同的民俗风情街,依... 详细信息

民俗风情街作为区别于传统商业街的特殊街道类型,因其能反映地域文化且具有一定美学价值,满足了人们对多元文化的需求而备受关注。经调研发现,目前风情街面临多种困境,为改善该局面,笔者通过整理现有文献,深入分析不同的民俗风情街,依据建设地点和特征将现有风情街细分为四种类型,即文化传承与保护型、城市更新型、日常生活型和商业娱乐型,并在场所精神理论的指导下对其面临的挑战提出针对性解决策略。

关键词：民俗风情街地域文化场所精神街道设计

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三维医学图像的交互式图形处理器快速重建

解剖学杂志 2007年第6期30卷 689-691,729页

作者：顾平王满宁宋志坚复旦大学数字医学研究中心上海200032

目的:开发一种基于图形处理器(GPU)的医学三维图像交互式重建系统,用于临床辅助诊断、手术计划等领域。方法:在GPU重建算法基础上使用了八叉树空间结构和多边形辅助光线投射方法实现进一步的优化,分别用基础算法和优化后的算法对一组CT... 详细信息

目的:开发一种基于图形处理器(GPU)的医学三维图像交互式重建系统,用于临床辅助诊断、手术计划等领域。方法:在GPU重建算法基础上使用了八叉树空间结构和多边形辅助光线投射方法实现进一步的优化,分别用基础算法和优化后的算法对一组CT图像进行重建,验证优化效果。结果:本研究实现的优化算法在真实医学三维图像重建中得到了高质量的重建结果,并且比原有的基于GPU的重建算法快2～3倍。结论:本研究实现的三维重建系统能有效加快重建速度,实现交互式快速重建。

关键词：三维重建图形处理器直接体绘制

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点匹配空间配准中三种误差之间的关系

组织工程与重建外科杂志 2014年第1期10卷 4-7页

作者：王满宁复旦大学基础医学院数字医学研究中心上海市医学图像处理与计算机辅助手术重点实验室上海市200032

目的基于标记点的点匹配方法普遍应用于计算机辅助手术的空间配准当中。点匹配中有标记点定位误差、标记点配准误差和靶点配准误差等三种误差定义方法,本实验着重研究这三种误差之间的关系及其对应用的影响。方法我们选择患者头颅CT数... 详细信息

目的基于标记点的点匹配方法普遍应用于计算机辅助手术的空间配准当中。点匹配中有标记点定位误差、标记点配准误差和靶点配准误差等三种误差定义方法,本实验着重研究这三种误差之间的关系及其对应用的影响。方法我们选择患者头颅CT数据进行空间配准的模拟试验,研究上述三种误差之间的关系。实验中我们使用几种不同的标记点数量,并且模拟了一个高斯分布和一个非高斯分布两种标记点定位误差模型。结果相同的标记点数量,标记点配准误差和靶点配准误差,都随着标记点定位误差的增加而增加。在相同的标记点定位误差分布模型下,标记点配准误差随着标记点数量的增加而增加,但是靶点配准误差随着标记点数量的增加而降低。在标记点定位误差符合相同高斯分布的情况下,标记点配准误差与靶点配准误差没有相关性,但是在标记点定位误差符合相同非高斯分布的情况下,两者之间表现出一定的相关性。结论在标记点数量不同的情况下,标记点配准误差不能用来衡量空间配准的情况。在标记点数量相同的情况下,标记点配准误差能否反应空间配准情况,则依赖于标记点定位误差的分布情况。

关键词：点匹配空间配准计算机辅助手术