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Study of ghost image suppression in polarized catadioptric virtual reality optical systems

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Virtual Reality & Intelligent Hardware 2020年第1期2卷 70-78页

作者： Xu PENG Zhenyu GAO Yitong DING Dongfeng ZHAO xiaoyu chi School of Instrumentation and Optoelectronic Engineering Qingdao Research Institute of Beihang UniversityQingdao 266100China Goertek Co. Ltd.Qingdao 266100China

Backgrounds This paper introduces a polarized catadioptric virtual reality optical *** a focus on the issue of serious ghost image in the system,root causes are analyzed based on design principles and optical *** The distribution of stray light is simulated using Lighttools,and three major ghost paths are selected using the area of the diffuse spot,S d and the energy ratio of the stray light,K as evaluation means.A method to restrain the ghost image through optimization of the structure of the optical system by controlling the focal power of the ghost image path is ***/Conclusions The results show that the S_(d) for the ghost image path increases by 40%and K decreases by 40%after *** image is effectively suppressed,which provides the theoretical basis and technical support for ghost suppression in a virtual reality optical system.

关键词： Virtual Reality Optical System Ghost Focal power Optical Design

Adaptive smoothing length method based on weighted average of neighboring particle density for SPH fluid simulation

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Virtual Reality & Intelligent Hardware 2021年第2期3卷 129-141页

作者： Rongda ZENG Zihao WU Shengbang DENG Jian ZHU xiaoyu chi School of Computer Science Guangdong University of TechnologyGuangzhou 510006China Qingdao Research Institute of Beihang University Qingdao 266000China

Background In the smoothed particle hydrodynamics(SPH)fluid simulation method,the smoothing length affects not only the process of neighbor search but also the calculation accuracy of the pressure ***,it plays a crucial role in ensuring the accuracy and stability of *** In this study,an adaptive SPH fluid simulation method with a variable smoothing length is *** this method,the smoothing length is adaptively adjusted according to the ratio of the particle density to the weighted average of the density of the neighboring ***,a neighbor search scheme and kernel function scheme are designed to solve the asymmetry problems caused by the variable smoothing *** The simulation efficiency of the proposed algorithm is comparable to that of some classical methods,and the variance of the number of neighboring particles is ***,the visual effect is more similar to the corresponding physical *** The precision of the interpolation calculation performed in the SPH algorithm is improved using the adaptive-smoothing length scheme;thus,the stability of the algorithm is enhanced,and a larger timestep is possible.

关键词： Fluid simulation SPH Smoothing length Adaptive Particle density

Amine-functionalized metal organic framework@graphene oxide as filler in PAEK-containing carboxyl group membrane for ultrafiltration with ultra-high permeability and strong fouling resistance

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chinese Journal of Chemical Engineering 2024年第6期70卷 93-103页

作者： Zhaoli Wang Wenjing Li Yi Zhang Yanyin Cheng Junjian Yu Tianming Dong xiaoyu chi Di Liu Zhe Wang School of Chemistry and Life Science Changchun University of TechnologyChangchun 130012China Advanced Institute of Materials Science Changchun University of TechnologyChangchun 130012China Key Laboratory of Advanced Functional Polymer Membrane Materials of Jilin Province Changchun 130012China

Achieving high fouling resistance and permeability using membrane separation technology in water treatment processes remains a *** this work,a novel mixed-matrix membrane(MMM)(poly(arylene ether ketone)[PAEK]-containing carboxyl groups[PAEK-COOH]/UiO-66-NH_(2)@graphene oxide[GO])with superb fouling resistance and high permeability was prepared by the nonsolvent-induced phase separation method,by in-situ growth of UiO-66-NH_(2) on the GO layer,and by preparing hydrophilic *** the basis of the structure and performance analysis of the MMM,the maximum water flux reached 591.25 L·m^(-2)·h^(-1) for PAEK-COOH/UiO-66-NH_(2)@GO,whereas the retention rate for bovine serum albumin increased from 85.40%to 94.87%.As the loading gradually increased,the hydrophilicity of the MMMs increased,significantly enhancing their fouling *** strongest anti-fouling ability observed was 94.74%,which was 2.02 times greater than that of the pure *** the same time,the MMMs contained internal amide and hydrogen bonds during the preparation process,forming a cross-linked structure,which further enhanced the mechanical strength and chemical *** summary,the MMMs with high retention rate,strong permeability,and anti-fouling ability were successfully prepared.

关键词： Poly(arylene ether ketone)-containing Carboxyl groups(PAEK-COOH) UiO-66-NH_(2)@graphene oxide Hydrophilic modification Ultra-high selectivity Strong anti-fouling

Freeform OST-HMD system with large exit pupil diameter and vision correction capability

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Photonics Research 2022年第1期10卷 21-32页

作者： DEWEN CHENG JIAXI DUAN HAILONG CHEN HE WANG DANYANG LI QIWEI WANG QICHAO HOU TONG YANG WEIHONG HOU DONGHUA WANG xiaoyu chi BIN JIANG YONGTIAN WANG Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China Ned Co. Ltd.Beijing 100081China Goertek Co. Ltd.Weifang 261031China

Compactness and light weight,large exit pupil diameter and distance,small distortion for virtual image,and see-through light paths are pivotal factors to achieve a better,wearable experience of optical see-through headmounted displays(OST-HMDs).In addition,light efficiency of the virtual image light path is an important factor for heat dissipation in HMD *** paper presents a new type of OST-HMD optical system that includes three wedge-shaped freeform prisms and two symmetric *** on a 0.71 ***,an OST-HMD prototype with a diagonal field of view(FOV)of 45.3°,an F-number(F/#)of 1.8,an exit pupil size of 12 mm×8 mm,and an eye relief of 18 mm is *** maximum value of distortion of the final system is 0.6%and 0.4%for virtual image and see-through light path,*** overall dimension of the optical system per eye is no larger than 30 mm(width)×40 mm(height)×14 mm(thickness),and the weight of the optical module including lenses,holder,and microdisplay is 12.8 *** light efficiency of the virtual image light path is up to 50%higher than those of other OST-HMD optical solutions.

关键词： system distortion correction

一种轨道式集装箱起重机小车车轮偏心纠偏装置

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港口装卸 2021年第3期 22-23,54页

作者：迟晓雨津冀国际集装箱码头有限公司

堆场轨道式集装箱起重机常出现小车行走跑偏、水平导向轮啃轨问题,导致轨道及导向轮磨损加快。通过分析小车跑偏的可能因素,提出一种在小车轮加装偏心装置的方案,纠正小车跑偏现象,取得了较好效果,具有较好的应用推广价值。

关键词：堆场轨道式集装箱起重机小车轮偏心装置

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海水酸化对中肋骨条藻的影响

海洋环境科学 2023年第5期42卷 758-765页

作者：迟小煜朱见斌米铁柱甄毓王建艳中国海洋大学环境科学与工程学院海洋环境与生态教育部重点实验室山东青岛266100 青岛海洋科学技术国家实验室海洋生态与环境科学功能实验室山东青岛266071 国家自然博物馆生命科学部北京100050

为探讨海水酸化对中肋骨条藻(Skeletonema costatum)的影响,本文选择pH和p CO_(2)两个影响海水酸化的主要因素对中肋骨条藻进行处理,测定了不同条件下该藻的生长速率、叶绿素荧光参数、颗粒有机碳(particulate organic carbon,POC)、颗... 详细信息

为探讨海水酸化对中肋骨条藻(Skeletonema costatum)的影响,本文选择pH和p CO_(2)两个影响海水酸化的主要因素对中肋骨条藻进行处理,测定了不同条件下该藻的生长速率、叶绿素荧光参数、颗粒有机碳(particulate organic carbon,POC)、颗粒有机氮(particulate organic nitrogen,PON)含量以及C/N。结果表明,海水酸化显著抑制中肋骨条藻生长,酸化组的生长速率为0.86/d,对照组的生长速率为0.99/d,这种抑制效应主要来自p CO_(2)的影响。海水酸化对中肋骨条藻的光合效率无显著影响。海水酸化使中肋骨条藻细胞的POC含量显著提高37.1%,PON含量显著提高43.3%,其中,POC含量受pH和p CO_(2)的共同影响,而PON含量主要受p CO_(2)影响,推测这种效应是p CO_(2)升高影响关键的代谢过程所致。海水酸化对中肋骨条藻C和N的积累具有促进作用,但藻细胞中C/N无显著性变化。

关键词：中肋骨条藻海水酸化 pH 二氧化碳分压

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基于组反馈融合机制的视频超分辨率模型

计算机应用研究 2022年第11期39卷 3492-3497页

作者：张庆武迟小羽朱鉴陈炳丰蔡瑞初广东工业大学计算机学院广州510006 北京航空航天大学青岛研究院山东青岛266104

现有的许多视频超分辨率(video super-resolution,VSR)工作都集中在如何有效地对齐相邻帧以更好地融合相邻帧信息,而很少在相邻帧信息融合这一重要步骤上进行研究。针对该问题,提出了基于组反馈融合机制的视频超分辩模型(GFFMVSR)。具... 详细信息

现有的许多视频超分辨率(video super-resolution,VSR)工作都集中在如何有效地对齐相邻帧以更好地融合相邻帧信息,而很少在相邻帧信息融合这一重要步骤上进行研究。针对该问题,提出了基于组反馈融合机制的视频超分辩模型(GFFMVSR)。具体来说,在相邻帧对齐后,将对齐视频序列输入第一重时间注意力模块;然后,将序列分成几个小组,各小组依次通过组内融合模块实现初步融合,不同小组的融合结果经过第二重时间注意力模块;各小组逐组输入反馈融合模块,利用反馈机制反馈融合不同组别的信息;最后将融合结果输出重建。经验证,该模型具有较强的信息融合能力,在客观评价指标和主观视觉效果上都优于现有的模型。

关键词：视频超分辨率时间注意力反馈机制分组融合

基于特征融合和注意力机制的图像超分辨率模型

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计算机应用研究 2022年第3期39卷 884-888页

作者：盘展鸿朱鉴迟小羽蔡瑞初陈炳丰广东工业大学计算机学院广州510006 北京航空航天大学青岛研究院山东青岛266000

现有的基于深度学习的单张图像超分辨率(single image super-resolution, SISR)模型通常是通过加深网络层数来提升模型的拟合能力,没有充分提取和复用特征,导致重建图像的质量较低。针对该问题,提出了基于特征融合和注意力机制的图像超... 详细信息

现有的基于深度学习的单张图像超分辨率(single image super-resolution, SISR)模型通常是通过加深网络层数来提升模型的拟合能力,没有充分提取和复用特征,导致重建图像的质量较低。针对该问题,提出了基于特征融合和注意力机制的图像超分辨率模型。该模型在特征提取模块使用残差中嵌入残差(residual in residual, RIR)的结构,该网络的特征提取模块由包含多个残差块的残差组构成,并且在每个残差组内进行局部特征融合,在每个组之间进行全局特征融合。此外,在每一个残差块中引入坐标注意力模块,在每一个残差组中引入空间注意力模块。经验证,该模型能充分提取特征并且复用特征。实验最终结果表明,该模型在客观评价指标和主观视觉效果上都优于现有的模型。

关键词：超分辨率深度学习特征融合注意力机制

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中国馆幕墙体系施工技术

建筑施工 2009年第8期31卷 629-631页

作者：赵明清王福东迟晓宇上海市第四建筑有限公司 200126 武汉凌云建筑装饰工程有限公司

通过对中国馆幕墙体系的施工技术优化,提出了针对性的施工方案并创新出幕墙制作移动小车,解决了现场不能搭设排架施工内倾斜幕墙的难题,确保高空幕墙的顺利施工,为工程顺利竣工奠定了基础。

关键词：世博会中国馆内倾幕墙幕墙体系施工垂直运输