检索结果-南通市图书馆

Parametric study on the sleep thermal environment

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Building Simulation 2022年第5期15卷 885-898页

作者： Ting Cao Zhiwei Lian Jingwen Zhu xinbo xu Heng Du Qiantao Zhao School of Design Shanghai Jiao Tong UniversityShanghai 200240China

Sleep thermal environment has a great effect on occupants7 sleep *** purpose of this study was to explore the relationships between sleep thermal environment parameters and sleep quality in winter and *** whole experiments involved indoor ambient temperatures(winter:17℃,20℃,23℃;summer:23℃,26℃,29℃)and relative humidity(RH;winter:40%,55%,70%;summer:40%,60%,80%).A total of 18 young subjects(23±2 years old)were divided into the two different season groups to experience the corresponding environmental *** subjective environmental perception and objective physiological signals were *** results showed that thermal sensations at 20℃in winter,as well as 26℃in summer,were considered as the thermal neutral *** sensation in winter before sleep was susceptible to SET*,while the middle value of SET*(32℃)related to the middle indoor air temperature(26℃)and air humidity(60%)before and after sleep could be the summer combination of neutral thermal ***,cold and wet environment in winter was found to seriously affect the deep *** summer,mild temperature contributing to good sleep quality might weaken the effect of humidity on *** combining the sleep environmental perception result with contour line and regression analysis on objective sleep quality,the suggested values of thermal environment parameters for young adults(21-25 years old)were as follows:20.3℃and 56%RH in winter,as well as 26.1℃and 52%RH in summer.

关键词： sleep thermal environment moderate parameters thermal sensation humid sensation interaction effect-regression analysis

Retrieval-and-alignment based large-scale indoor point cloud semantic segmentation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第4期67卷 164-180页

作者： Zongyi xu Xiaoshui HUANG Bo YUAN Yangfu WANG Qianni ZHANG Weisheng LI xinbo GAO School of Computer Science and Technology Chongqing University of Posts and Telecommunications Shanghai Artificial Intelligence Laboratory School of Electronic Engineering and Computer Science Queen Mary University of London

Current methods for point cloud semantic segmentation depend on the extraction of descriptive features. However, unlike images, point clouds are irregular and often lack texture information, making it demanding to extract discriminative features. In addition, noise, outliers, and uneven point distribution are commonly present in point clouds, which further complicates the segmentation task. To address these problems, a novel architecture is proposed for direct and accurate large-scale point cloud segmentation based on point cloud retrieval and alignment. The proposed approach involves using a feature-based point cloud retrieval method for searching for reference point clouds with annotations from a dataset. In the following segmentation stage, an overlap-based point cloud registration method has been developed to align the target and reference point clouds. For accurate and robust alignment, an overlap region estimation module is trained to locate the optimal overlap region between two pieces of point clouds in a coarse-to-fine manner. In the detected overlap region, the global and local features of the points are extracted and combined for featuremetric registration to obtain accurate transformation parameters between the target and reference point clouds. After alignment, the annotated segmentation of the reference is transferred to the target point clouds to obtain accurate segmentation results. Extensive experiments are conducted to show that the developed method outperforms the state-of-the-art approaches in terms of both accuracy and robustness against noise and outliers.

关键词： point cloud semantic segmentation large-scale indoor point clouds point cloud alignment overlap estimation label transfer

Sub-Homogeneous Peridynamic Model for Fracture and Failure Analysis of Roadway Surrounding Rock

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2024年第6期139卷 3167-3187页

作者： Shijun Zhao Qing Zhang Yusong Miao Weizhao Zhang xinbo Zhao Wei xu School of Science Qingdao University of TechnologyQingdao266520China College of Mechanics and Materials Hohai UniversityNanjing211100China Xibei Mining Co. Ltd.Shandong Energy GroupXi’an710018China

The surrounding rock of roadways exhibits intricate characteristics of discontinuity and *** address these complexities,this study employs non-local Peridynamics(PD)theory and reconstructs the kernel function to represent accurately the spatial decline of long-range ***,modifications to the traditional bondbased PD model are *** considering the micro-structure of coal-rock materials within a uniform discrete model,heterogeneity characterized by bond random pre-breaking is *** approach facilitates the proposal of a novel model capable of handling the random distribution characteristics of material heterogeneity,rendering the PD model suitable for analyzing the deformation and failure of heterogeneous layered coal-rock mass *** established numerical model and simulation method,termed the sub-homogeneous PD model,not only incorporates the support effect but also captures accurately the random heterogeneous micro-structure of roadway surrounding *** simulation results obtained using this model show good agreement with field measurements from the Fucun coal mine,effectively validating the model’s capability in accurately reproducing the deformation and failure mode of surrounding rock under bolt-supported(anchor cable).The proposed subhomogeneous PD model presents a valuable and effective simulation tool for studying the deformation and failure of roadway surrounding rock in coal mines,offering new insights and potential advancements.

关键词： Roadway surrounding rock peridynamics heterogeneous material fracture analysis numerical simulation

FUZZY PARTITIONING OF FEATURE SPACE FOR PATTERN CLASSIFICATION BASED ON SUPERVISED C1USTERING

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2000年第2期17卷 170-177页

作者： Gao xinbo xu Chunguang Xie Weixin (School of Electronic Engineering, Xidian University, Xi’an 710071)

The choice of a fuzzy partitioning is crucial to the performance of a fuzzy system based on if-then rules. However, most of the existing methods are complicated or lead ,o too many subspaces, which is unfit for the applications of pattern classification. A simple but effective clustering approach is proposed in this paper, which obtains a set of compact subspaces and is applicable for classification problems with higher dimensional feature. Its effectiveness is demonstrated by the experimental results.

关键词： Pattern classification Fuzzy if-then rules Fuzzy clustering Fuzzy partitioning

在线全文

学校读者我要写书评

暂无评论

3-RPS并联机构奇异位形及工作空间研究

农业机械学报 2007年第5期38卷 143-146页

作者：鲁开讲牛禄峰刘亚茹徐新博宝鸡文理学院机电工程系

提出一种求解并联机构无奇异位形工作空间的方法。通过分析3-RPS并联机构在奇异位形时动平台的微分运动与结构约束及关节约束的关系,得到机构奇异位形判别方程和奇异位形曲面方程。探索了工作空间边界,综合分析了机构奇异位形与工作空... 详细信息

提出一种求解并联机构无奇异位形工作空间的方法。通过分析3-RPS并联机构在奇异位形时动平台的微分运动与结构约束及关节约束的关系,得到机构奇异位形判别方程和奇异位形曲面方程。探索了工作空间边界,综合分析了机构奇异位形与工作空间的关系。合理选择机构结构参数和关节变化范围,得到了无奇异位形的工作空间。

关键词：并联机构微分运动奇异位形曲面工作空间

在线全文

学校读者我要写书评

暂无评论

高职食品专业选修课程完善研究

现代食品 2015年第21期 1-2页

作者：徐新博辽源职业技术学院吉林辽源136200

在我国高职食品专业教学实践过程中,选修课程的完善与调整对专业学习质量与学生就业情况的改善,有重要的促进作用。所以在实践教育过程中,我们利用学分制度应用、合理设置技术选修课程以及开展综合素质教育等方式,合理完善选修课程内容... 详细信息

在我国高职食品专业教学实践过程中,选修课程的完善与调整对专业学习质量与学生就业情况的改善,有重要的促进作用。所以在实践教育过程中,我们利用学分制度应用、合理设置技术选修课程以及开展综合素质教育等方式,合理完善选修课程内容,为选修课程质量的提高提供有力支持。

关键词：高职食品专业选修课程完善

Riverine sulfate sources and behaviors in arid environment,Northwest China:Constraints from sulfur and oxygen isotopes

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第3期137卷 716-731页

作者： Yifu xu Wenjing Liu Bing xu Zhifang xu Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

The fate of riverine sulfate ion (SO_(4)^(2-)) and its environmental effects in arid environment are difficult to evaluate due to its complicated sources and strongly coupled behaviors with water cycle which is significantly modified by *** understand the sulfur cycle in aquatic systems in arid environment,the chemical and sulfur and oxygen isotopic compositions (δ^(34)S_(SO4)and δ^(18)O_(SO4)) of major rivers around the Badain Jaran Desert,northwestern China,were *** rivers had averaged SO_(4)^(2-)content at 1336μmol/L,over 10times higher than the global *** δ^(34)S_(SO4)and δ^(18)O_(SO4)values ranged from-5.3‰to+11.8‰and+1.6‰to+12.8‰,*** end-member analysis and the inverse model showed that riverine sulfate was mainly derived from evaporites dissolution (0-87%),sulfide oxidation (13%-100%) and precipitation (0-33%),indicating heterogeneity in sulfur sources and behaviors along the river drainage with the lithology variations and climate *** isotopic tools combining with hydro-chemistry compositions could be applied to reveal sulfur cycle in arid *** on the calculation,sulfide oxidation plays the primary role in the headwater and upstream in the Qilian-Mountains area,where sulfide is widely *** the proportion of evaporites dissolution contributing to riverine sulfate is much higher in downstream in a drier ***,less precipitation and higher temperature can lead to more intensive evaporation,affecting the process of sulfide oxidation and enhancing the rates of evaporites dissolution and sulfate precipitation in the basin.

关键词： Sulfur and oxygen isotopes Source apportionment Inverse model Arid environment Inland rivers Northwestern China

食品营养与检测专业在高职院校中实践教学的研究

在线全文

学校读者我要写书评

暂无评论

现代食品 2015年第20期 59-61页

作者：徐新博辽源职业技术学院吉林辽源136200

本文主要是针对高职院校中食品营养与检测专业中对学生的教学模式及其人才培养模式,探讨一下实践性教学面临的现状及其需要改进的地方。

关键词：食品工学结合高职

在线全文

学校读者我要写书评

暂无评论

新形势下食品安全可追溯系统应用

现代食品 2015年第23期 3-4页

作者：徐新博辽源职业技术学院吉林辽源136200

我国的食品安全可追溯系统应用发展正处于关键期,面临着很多亟需解决的问题,如技术问题等。食品安全问题是当今社会发展尤为重视的方面之一,对此政府部门应大力支持其发展,提升其技术水平,并加强社会监督等。

关键词：新形势食品安全可追溯系统