检索结果-南通市图书馆

汽车电器 2024年第3期 37-39页

作者：王翠韩勇郭政子马佳辉吉利汽车研究院架构开发部浙江宁波315110

文章针对座椅自动加热或通风功能的实现方法及控制逻辑进行陈述说明,从实现的逻辑策略角度入手,对系统组成、结构图以及工作原理进行简要分析,最后得出结论,以便能为车主提供更加人性化、智能化的使用体验,提升用户在驾乘车辆过程中座... 详细信息

文章针对座椅自动加热或通风功能的实现方法及控制逻辑进行陈述说明,从实现的逻辑策略角度入手,对系统组成、结构图以及工作原理进行简要分析,最后得出结论,以便能为车主提供更加人性化、智能化的使用体验,提升用户在驾乘车辆过程中座椅的舒适感。

关键词：座椅自动加热座椅自动通风座椅占位传感器车内温度外界温度

维普期刊数据库博看期刊

高职《动物生物化学》课前教学视频自主学习情况分析

在线全文

学校读者我要写书评

暂无评论

养殖与饲料 2024年第3期23卷 126-130页

作者：马建民王黎霞郭彤北京农业职业学院畜牧兽医系北京102442

[目的]为了实现高职课程课前视频学习资源的合理设计,帮助学生自主完成课前学习任务。[方法]通过分析《动物生物化学》课程的课前视频教学数据和课前学习的调查问卷,分析影响学生完成课前视频学习的主要因素和提出构建课前自主学习视频... 详细信息

[目的]为了实现高职课程课前视频学习资源的合理设计,帮助学生自主完成课前学习任务。[方法]通过分析《动物生物化学》课程的课前视频教学数据和课前学习的调查问卷,分析影响学生完成课前视频学习的主要因素和提出构建课前自主学习视频的策略。[结果]课前视频学习资源的实验性、交互性和案例性,有利于提高学生自主学习的完成率;课前视频学习资源的难度和长度会降低学生的完成率;大多数课前学习结果测试成绩与课前视频学习资源的反刍比不相关;学生们不愿在课前学习上投入太多时间。[结论]应减少课前学习视频的数量,降低学生自主学习的负担;教师应采取多种形式对学生的课前学习结果进行评价;课前视频学习资源的设计可以利用视频内容的实验性、交互性和案例性,平衡视频内容的难度和长度,以提高学生的观看完成率。

关键词：高职教育动物生物化学课前自主学习教学设计策略

维普期刊数据库博看期刊

Evaluation on Fatigue Performance and Fracture Mechanism of Laser Welded TWIP Steel Joint Based on Evolution of Microstructure and Micromechanical Properties

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2016年第7期23卷 677-684页

作者： Li-li ma Ying-hui WEI Li-feng HOU Chun-li guo College of materials Science and Engineering Taiyuan University of Technology Taiyuan 030024Shanxi China Shanxi Institute of Technology Yangquan 045000 Shanxi China

The fatigue performance and fracture mechanism of laser welded twinning induced plasticity（TWIP）steel joint were investigated experimentally based on the evolution of microstructure and micromechanical *** optical microscopy was used to analyze the evolution of *** variation of composition and phase structure of fusion zone were detected by energy dispersive X-ray and X-ray diffraction *** micromechanical behaviors of the various zones were characterized using *** static tensile test and high cycle fatigue test were performed to evaluate the mechanical properties of welded joint and base *** microstructures,tensile properties and fatigue strength of base metal as well as welded metal were *** fatigue fracture surfaces of base metal and welded joint were observed by means of scanning electron microscopy,in order to identify fatigue crack initiation sites and propagation ***,the fatigue fracture characteristics and mechanisms for the laser welded TWIP steel joints were analyzed.

关键词： TWIP steel laser welding microstructure high cycle fatigue fatigue performance fatigue fracture mechanism

Preoperative serum cortisone levels are associated with cognition in preschool‑aged children with tetralogy of Fallot after corrective surgery:new evidence from human populations and mice

在线全文

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2024年第2期20卷 173-184页

作者： Si-Yu ma Yu-Ting Liu Yue-Shuang Cun Qiang Wang Ming-Cui Fu Ke-De Wu Xin-Yu Cai Shu-Ting Cheng Nishant Patel Min Da Liang Hu Zhuoga Deqin Xue-Jun Kang Ming Yang Xu-Ming Mo Department of Cardiothoracic Surgery Children’s Hospital of Nanjing Medical University72 Guangzhou RoadNanjing 210008China Department of Radiology Children’s Hospital of Nanjing Medical University72 Guangzhou RoadNanjing 210008China Key Laboratory of Child Development and Learning Science Research Center For Learning ScienceSchool of Biological Sciences&Medical EngineeringMinistry of EducationSoutheast UniversityNanjing 210096China Medical School of Nanjing University Nanjing 210093China

Background Tetralogy of Fallot(TOF)is the most common cyanotic congenital heart *** with TOF would be confronted with neurological impairment across their *** study aimed to identify the risk factors for cerebral morphology changes and cognition in postoperative preschool-aged children with *** We used mass spectrometry(MS)technology to assess the levels of serum metabolites,Wechsler preschool and primary scale of intelligence-Fourth edition(WPPSI-Ⅳ)index scores to evaluate neurodevelopmental levels and multimodal magnetic resonance imaging(MRI)to detect cortical morphological *** Multiple linear regression showed that preoperative levels of serum cortisone were positively correlated with the gyrification index of the left inferior parietal gyrus in children with TOF and negatively related to their lower visual spaces index and nonverbal ***,preoperative SpO_(2) was negatively correlated with levels of serum cortisone after adjusting for all ***,after intervening levels of cortisone in chronic hypoxic model mice,total brain volumes were reduced at both postnatal(P)11.5 and P30 *** Our results suggest that preoperative serum cortisone levels could be used as a biomarker of neurodevelopmental impairment in children with *** study findings emphasized that preoperative levels of cortisone could influence cerebral development and cognition abilities in children with TOF.

关键词： Cognition Cortisone MRI Neurodevelopment Tetralogy of Fallot

Photographic Appearance Enhancement via Detail-Based Dictionary Learning

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 Computer Science & Technology 2017年第3期32卷 417-429页

作者： zhi-Feng Xie Shi Tang Dong-Jin Huang You-Dong Ding Li-Zhuang ma Department of Film and Television Engineering Shanghai University Shanghai 200072 China Shanghai Engineering Research Center of Motion Picture Special Effects Shanghai 200072 China Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

A number of edge-aware filters can efficiently boost the appearance of an image by detail decomposition and enhancement. However, they often fail to produce photographic enhanced appearance due to some visible artifacts, especially noise, halos and unnatural contrast. The essential reason is that the guidance and the constraint of high-quality appearance are not sufficient enough in the process of enhancement. Thus our idea is to train a detail dictionary from a lot of high-quality patches in order to constrain and control the entire appearance enhancement. In this paper, we propose a novel learning-based enhancement method for photographic appearance, which includes two main stages： dictionary training and sparse reconstruction. In the training stage, we construct a training set of detail patches extracted from some high-quality photos, and then train an overcomplete detail dictionary by iteratively minimizing an？1-norm energy function. In the reconstruction stage, we employ the trained dictionary to reconstruct the boosted detail layer, and further formalize a gradient-guided optimization function to improve the local coherence between patches. Moreover, we propose two evaluation metrics to measure the performance of appearance enhancement. The final experimental results have demonstrated the effectiveness of our learning-based enhancement method.

关键词： image enhancement dictionary learning edge-aware filter

Radical Addition of Perfluoroalkyl Iodides to Alkenes and Alkynes Initiated by Sodium Dithionite in an Aqueous Solution in the Presence of a Novel Fluorosurfactant

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

Chinese Journal of Chemistry 2013年第7期31卷 939-944页

作者： zhiwei Xiao Huawei Hu Jiaoli ma Qingyun Chen Yong guo Key Laboratory of Organofluorine Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China

A new fluorinated anionic surfactant Cl（CF2）6O（CF2）2SO3N（C2H5）4 was prepared and characterized. The application of the fluorosurfactant allowed the fluoroalkylation to occur in the water without adding organic solvent. The addition of perfluoroalkyl iodides with olefins and alkynes under the initiation of Na2S2O4 in water in the presence of the fluorosurfactant gave the corresponding adducts in good to excellent yields. The fluorosurfactant was suitable for a radical addition process.

关键词： surfactant fuorine aqueous sodium dithionite radical

Debris Flow Susceptibility Assessment Using a Probabilistic Approach:A Case Study in the Longchi Area, Sichuan Province, China

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 Mountain Science 2014年第4期11卷 1001-1014页

作者： CHANG Ming TANG Chuan ZHANG Dan-dan ma guo-chao State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology

The Longchi area with the city of Dujiangyan, in the Sichuan province of China, is composed of Permian stone and diorites and Triassic sandstones and mudstones intercalated with slates. An abundance of loose co-seismic materials were present on the slopes after the may 12, 2008 Wenchuan earthquake, which in later years served as source material for rainfall-induced debris flows or shallow landslides. A total of 48 debris flows, all triggered by heavy rainfall on 13th August 20l0, are described in this paper. Field investigation, supported by remote sensing image interpretation, was conducted to interpret the co-seismic landslides in the debris flow gullies. Specific characteristics of the study area such as slope, aspect, elevation, channel gradient, lithology, and gully density were selected for the evaluation of debris flow susceptibility. A score was given to all the debris flow gullies based on the probability of debris flow occurrence for the selected factors. In order to get the contribution of the different factors, principal component analyses were applied. A comprehensive score was obtained for the 48 debris flow gullies which enabled us to make a susceptibility map for debris flows with three classes. Twenty-two gullies have a high susceptibility, twenty gullies show a moderate susceptibility and six gullies have a low susceptibility for debris flows.

关键词： Debris flow Landslide Probability Susceptibility assessment Grey correlation

高压开关柜故障起火自动灭火装置优化设计研究

在线全文

学校读者我要写书评

暂无评论

高压电器 2024年第1期60卷 41-47页

作者：张佳庆谢佳黄伟民过羿尚峰举贾佳王伟马国明国网安徽省电力有限公司电力科学研究院合肥230601 电力火灾与安全防护安徽省重点实验室合肥230022 国家电网公司输变电设施火灾防护实验室合肥230022 国网安徽省电力有限公司合肥230061 华北电力大学新能源电力系统国家重点实验室北京102206

近年来发生了多起高压开关柜火灾事故,传统开关柜灭火通过人工方式灭火,存在灭火效率低、人员风险大等问题。现有开关柜自动灭火装置研究存在引入电场畸变、启动阈值不清及灭火剂选择不当等问题。为解决上述问题,文中开展了高压开关柜... 详细信息

近年来发生了多起高压开关柜火灾事故,传统开关柜灭火通过人工方式灭火,存在灭火效率低、人员风险大等问题。现有开关柜自动灭火装置研究存在引入电场畸变、启动阈值不清及灭火剂选择不当等问题。为解决上述问题,文中开展了高压开关柜故障起火自动灭火系统研究。优化设计了了灭火剂喷头结构,降低了最大场强,避免了绝缘击穿风险。进行了真型开关柜火灾模拟试验,基于试验过程中温度场分布确定了灭火装置启动阈值。探索了灭火剂类型与用量,确定了合理的高压开关柜灭火剂设置方案。建立了完整的高压开关柜自动灭火系统,试验结果表明文中所提出灭火系统快速有效。

关键词：高压开关柜灭火装置电场优化启动阈值真型实验

Directed graph-based distribution network reconfiguration for operation mode adjustment and service restoration considering distributed generation

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2017年第1期5卷 142-149页

作者： Haifeng HONG Zhesheng HU Ruipeng guo Jun ma Jiong TIAN College of Electrical Engineering Zhejiang UniversityHangzhou 310027China Ningxia Electric Power Company State Grid Corporation of ChinaYinchuan 750001China

We present a directed graph-based method for distribution network reconfiguration considering distributed generation. Two reconfiguration situations are considered: operation mode adjustment with the objective of minimizing active power loss(situation Ⅰ) and service restoration with the objective of maximizing loads restored(situation Ⅱ). These two situations are modeled as a mixed integer quadratic programming problem and a mixed integer linear programming problem, respectively. The properties of the distribution network with distributed generation considered are reflected as the structure model and the constraints described by directed graph. More specifically, the concepts of "in-degree" and "out-degree"are presented to ensure the radial structure of the distribution network, and the concepts of "virtual node" and"virtual demand" are developed to ensure the connectivity of charged nodes in every independent power supply *** validity and effectiveness of the proposed method are verified by test results of an IEEE 33-bus system and a 5-feeder system.

关键词： Distribution network Distributed generation Network reconfiguration Directed graph Operation mode adjustment Service restoration

Hot Deformation Behavior of SA508GR.4N Steel for Nuclear Reactor Pressure Vessels

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2016年第12期23卷 1342-1348页

作者： Ning LIU Zheng-dong LIU Xi-kou HE zhi-qiang YANG Long-teng ma Faculty of materials Science and Engineering Kunming University of Science and Technology Institute for Special Steels Central Iron and Steel Research Institute

A hot compression experiment （1073 1473 K, strain rates of 0. 001-10 s -1 ） of SAS08GR. 4N low alloy steel was performed using a Gleeble-3800 thermal-mechanical simulator, and the hot deformation behavior of the steel was investigated by analyzing both the true stress true strain curves and its microstructures. The thermal de formation equation and hot deformation activation energy （Q） of SA508GR. 4N steel were obtained by regression with a classic hyperbolic sine function. The hot processing map of SAS08GR. 4N steel was also established. An empirical equation for the stress peak was described for practical applications. The SA508GR. 4N steel showed a critical Zener-Hollomon parameter （lnZc） for dynamic recrystallization （DRX） of 37.44, below which full DRX may occur. The sensitivity of the SA508GR. 4N steel increased linearly with test temperature, such that higher temperatures led to enhanced workability.

关键词： SA508GR. 4N steel dynamic recrystallization hot deformation equation hot processing map ZenerHollomon parameter