检索结果-南通市图书馆

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当代图书馆员社会满意度与主观幸福感关系

图书馆论坛 2024年第5期44卷 25-31,39页

作者：汪汉清路锦怡朱军华南京农业大学信息管理学院南开大学商学院信息资源管理系萧山图书馆

图书馆员作为推动全民阅读的中坚力量,其社会满意度影响着图书馆社会职能的发挥与图书馆员职业价值的实现。文章以面向13,476位馆员的问卷调查为基础,评估当代图书馆员的社会满意度水平,分析不同地区图书馆员的社会满意度差异,进一步探... 详细信息

图书馆员作为推动全民阅读的中坚力量,其社会满意度影响着图书馆社会职能的发挥与图书馆员职业价值的实现。文章以面向13,476位馆员的问卷调查为基础,评估当代图书馆员的社会满意度水平,分析不同地区图书馆员的社会满意度差异,进一步探究图书馆员社会满意度与主观幸福感的关系。研究发现:图书馆员的整体社会满意度较高,东部图书馆员的社会满意度显著高于其他地区,微观层面的个人生活满意度与图书馆员的主观幸福感相关性更强。

关键词：图书馆员社会满意度主观幸福感快乐指数

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Sensitivity analysis of pull-in voltage for RF MEMS switch based on modified couple stress theory

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Applied Mathematics and Mechanics(English Edition) 2015年第12期36卷 1555-1568页

作者： junhua zhu Renhuai LIU Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Institute of Applied Mechanics Jinan University

An approximate analytical model for calculating the pull-in voltage of a stepped cantilever-type radio frequency （RF） micro electro-mechanical system （MEMS） switch is developed based on the Euler-Bernoulli beam and a modified couple stress theory, and is validated by comparison with the finite element results. The sensitivity functions of the pull-in voltage to the designed parameters are derived based on the proposed model. The sensitivity investigation shows that the pull-in voltage sensitivities increase/decrease nonlinearly with the increases in the designed parameters. For the stepped cantilever beam, there exists a nonzero optimal dimensionless length ratio, where the pull-in voltage is insensitive. The optimal value of the dimensionless length ratio only depends on the dimensionless width ratio, and can be obtained by solving a nonlinear equation. The determination of the designed parameters is discussed, and some recommendations are made for the RF MEMS switch optimization.

关键词： stepped cantilever beam pull-in voltage modified couple stress theory radio frequency (RF) micro electro-mechanical system (MEMS) switch analytical solution,sensitivity analysis

PI-type Iterative Learning Control for Nonlinear Electro-hydraulic Servo Vibrating System

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Chinese Journal of Mechanical Engineering 2009年第3期22卷 451-455页

作者： LUO Xiaohui zhu Yuquan HU junhua School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

For the electro-hydraulic servo vibrating system（ESVS） with the characteristics of non-linearity and repeating motion, a novel method, PI-type iterative learning control（ILC）, is proposed on the basis of traditional PID control. By using memory ability of computer, the method keeps last time＇s tracking error of the system and then applies the error information to the next time＇s control process. At the same time, a forgetting factor and a D-type learning law of feedforward fuzzy-inferring referenced displacement error under the optimal objective are employed to enhance the systemic robustness and tracking accuracy. The results of simulation and test reveal that the algorithm has a trait of high repeating precision, and could restrain the influence of nonlinear factors like leaking, external disturbance, aerated oil, etc. Compared with traditional PID control, it could better meet the requirement of nonlinear electro -hydraulic servo vibrating system.

关键词： electro-hydraulic vibrating system PI iterative learning forgetting factor fuzzy inference

Aspen Plus在脱丁烷塔降压案例中的应用

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石油炼制与化工 2024年第9期55卷 144-149页

作者：廖昌勇黄国金刘贤光朱俊桦中国石化茂名分公司广东茂名525000

脱丁烷塔聚合物结垢问题是制约乙烯装置长周期运行的主要因素之一。目前新建装置通过降低操作压力在防止脱丁烷塔聚合物结垢方面取得了显著效果。以脱丁烷塔为例,对降压过程的可行性、经济性以及风险点进行分析和总结,利用化工流程模拟... 详细信息

脱丁烷塔聚合物结垢问题是制约乙烯装置长周期运行的主要因素之一。目前新建装置通过降低操作压力在防止脱丁烷塔聚合物结垢方面取得了显著效果。以脱丁烷塔为例,对降压过程的可行性、经济性以及风险点进行分析和总结,利用化工流程模拟软件Aspen Plus对降压后各项工艺参数进行模拟优化,将优化结果应用于实际生产过程。结果表明,脱丁烷塔的降压极限为350 kPa,降压后全塔温度降低约4℃,塔釜粗裂解汽油中的C_(4)摩尔分数降低0.32百分点,节省低压蒸汽1.3 t h,装置能耗和C_(4)产品损失降低,循环水侧压降、循环水在换热器内的流速和对数传热温差均在合理范围之内。

关键词：乙烯脱丁烷塔聚合结垢流程模拟降压操作

The effect of nozzle layout on droplet ejection of a piezo-electrically actuated micro-atomizer

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Acta Mechanica Sinica 2007年第2期23卷 163-172页

作者： Yanying Feng Zhaoying Zhou junhua zhu Guibin Du Department of Precision Instruments and Mechanology.Tsinghua University Beijing 100084. China State Key Laboratory of Transducer Technology Chinese Academy of Sciences Beijing 100080. China

We study here effects of nozzle layout on the droplet ejection of a micro atomizer, which was fabricated with the arrayed nozzles by the MEMS technology and actuated by a piezoelectric disc. A theoretical model was first built for this piezoelectric-liquid-structure coupling system to characterize the acoustic wave propagation in the liquid chamber, which determined the droplet formation out of nozzles. The modal analysis was carried out numerically to predict resonant frequencies and simulate the corresponding pressure wave field. By comparing the amplitude contours of pressure wave on the liquid-solid interface at nozzle inlets with the designed nozzle layout, behaviors of the device under different vibration modes can be predicted. Experimentally, an impedance analyzer was used to measure the resonant frequencies of the system. Three types of atomizers with different nozzle layouts were fabricated for measuring the effect of nozzle distribution on the ejection performance. The visualization experiment of droplet generation was carried out and volume flow rates of these devices were measured. The good agreement between the experiment and the prediction proved that only the increase of nozzles may not enhance the droplet generation and a design of nozzle distribution from a view-point of frequency is necessary for a resonant related atomizer.

关键词： Nozzle layout . Fluid-solid coupling . Modal analysis . Micro atomizer . MEMS

水泥基3D打印技术在岩石力学教学实验中的应用

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实验技术与管理 2024年第9期41卷 199-205页

作者：刘强吴荆凯胡文韬祝俊华于洋华东交通大学土木建筑学院轨道交通基础设施性能监测与保障国家重点实验室江西南昌330013

该文将水泥基3D打印技术应用到岩石力学教学实验中,采用水泥基3D打印技术制作类岩石力学试样,不仅能降低实验成本,还可融入增材建造、混凝土材料和岩石力学等课程专业知识,丰富了实验教学内容,提高了教学质量。该实验让学生自主选择打... 详细信息

该文将水泥基3D打印技术应用到岩石力学教学实验中,采用水泥基3D打印技术制作类岩石力学试样,不仅能降低实验成本,还可融入增材建造、混凝土材料和岩石力学等课程专业知识,丰富了实验教学内容,提高了教学质量。该实验让学生自主选择打印材料、设计打印模型、优化打印路径,最后打印制作出类岩石力学试样,并完成岩石力学实验。整个实验过程有助于增强学生的学科交叉知识运用能力和动手能力,培养创新思维和科学素养。

关键词：水泥基3D打印岩石力学水泥材料单轴压缩实验教学

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课程思政融入农林类专业人才培养策略

现代农业科技 2024年第18期 208-211页

作者：朱俊华林谕彤朱艺萍梁芳玉林师范学院广西玉林537000 柳州市崇远中学广西柳州545000

在农林类人才培养过程中,存在传统教学过程弱化与社会服务的衔接问题。课程思政旨在通过将思政教育融入专业课程教学过程中,从而实现育人与育才的教育目的。基于此,从职业规划课程、专业课程学习、教产研三元融合、整合育人资源、发挥... 详细信息

在农林类人才培养过程中,存在传统教学过程弱化与社会服务的衔接问题。课程思政旨在通过将思政教育融入专业课程教学过程中,从而实现育人与育才的教育目的。基于此,从职业规划课程、专业课程学习、教产研三元融合、整合育人资源、发挥班主任和辅导员在思政教育中的引领作用等方面提出课程思政融入农林类专业人才培养策略,以期为提高农林类专业学生素质提供参考。

关键词：课程思政农林类专业人才培养职业规划课程专业课程

应用测量电压法快速查找电梯安全回路、门锁回路故障

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中国电梯 2024年第6期35卷 79-80,83页

作者：蔡剑云郑亨翡朱俊华浙江飞亚电梯有限公司浙江金华2321000

在众多的电梯故障中,出现频次较高的是安全回路、门锁回路故障,维保人员维修检查时比较费时。结合大量的实践经验,总结出如何应用测量电压法快速查找电梯安全回路、门锁回路故障的步骤,提高了电梯维修速度,为客户节约了时间。详细介绍... 详细信息

在众多的电梯故障中,出现频次较高的是安全回路、门锁回路故障,维保人员维修检查时比较费时。结合大量的实践经验,总结出如何应用测量电压法快速查找电梯安全回路、门锁回路故障的步骤,提高了电梯维修速度,为客户节约了时间。详细介绍了应用测量电压法查找安全回路、门锁回路故障的步骤,并指出了注意事项。

关键词：电梯安全回路故障门锁回路故障快速查找测量电压法

Impact of Different Diets on Adult Tri-Spine Horseshoe Crab,Tachypleus tridentatus

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Journal of Ocean University of China 2022年第3期21卷 541-548页

作者： YING Ziwei BAO Yuyuan LI Yinkang YE Guoling ZHANG Shuhuan XU Peng zhu junhua XIE Xiaoyong Guangdong Provincial Key Laboratory of Fishery Ecology and Environment South China Sea Fisheries Research InstituteChinese Academy of Fisheries SciencesGuangzhou510300China College of Fisheries Science and Life Science of Shanghai Ocean University Shanghai201306China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou511458China Guangdong Ocean Planning Research Center Guangzhou510322China Sturgeon Healthy Breeding and Medicinal Research Center Guizhou University of Traditional Chinese MedicineGuiyang550025China College of Marine Sciences Beibu Gulf UniversityQinzhou535011China

Effective culture and management of adult tri-spine horseshoe crab,Tachypleus tridentatus can ensure that stock enhancement programs and aquaculture systems are *** explore suitable feed for animals during the breeding season,Pacific oyster(Ostrea gigas)(oyster group;OG)and frozen sharpbelly fish(Hemiculter leucisculus)(frozen fish group;FG)were selected to feed 20 *** male and female pairs,*** the end of the experiment,intestinal samples were obtained to measure digestive enzymes *** intestinal flora were determined by 16S r DNA *** eggs were observed in the FG and one *** adult *** animals died in the OG,and 9.7×10;eggs were *** results show that oysters are more suitable for the development and reproduction of adult *** than frozen ***,the digestive enzyme activity analysis revealed that animals in the OG exhibited higher protein digestibility than those in the FG,but no significant differences in lipid and carbohydrate uptake were observed between the ***,the intestinal flora analysis showed that operational taxonomic units(OTUs)and the Chao1 index were significantly higher in the OG than in the FG,but no significant difference was observed in the Shannon or Simpson indices between the *** data indicate that the oyster diet improved the intestinal microbial diversity of *** hypothesize that nutrients,such as oyster-based taurine,proteins,and highly unsaturated fatty acids,improve protease activity in the *** digestive tract,alter the intestinal floral structure,and improve the reproductive performance of ***.

关键词： Tachypleus tridentatus diet reproductive performance digestive enzyme activity intestinal flora