检索结果-南通市图书馆

The study of the effect of gas-phase fluctuation on slag flow and refractory brick corrosion in the slag tapping hole of an entrained-flow gasifier

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第7期35卷 271-281页

作者： kuo Lin Zhongjie Shen Qinfeng liang Jianliang Xu Haifeng Liu Shanghai Engineering Research Center of Coal Gasification East China University of Science and TechnologyShanghai 200237China Institute of Clean Coal Technology East China University of Science and TechnologyShanghai 200237China

The service life of refractory brick in the slag tapping hole of the entrained flow gasifier was significantly lower than that in other *** was critically important to study the corrosion mechanism of refractory brick in the slag tapping hole for guiding industrial *** the complex flow field in the slag tapping hole,the influence of gas velocity and temperature fluctuation on the service life of refractory brick was investigated in this *** results showed that the slag flow characteristics periodically changed with the gas temperature and velocity *** brick corrosion rate increased with the decrease of fluctuation *** with the gas-phase velocity fluctuation,the gasphase temperature fluctuation had a more significant influence on the brick corrosion *** the fluctuation frequency was 0.01 Hz and the gas temperature fluctuation amplitude was 200 K,the corrosion rate of refractory bricks increased by 25%.It could be concluded that the fluctuation of gas-phase temperature was the main cause for the low service life of refractory bricks in the tapping hole.

关键词： Gasification Brick corrosion Dynamic response Slag flow Heat transfer

虚拟现实技术在孤独症谱系障碍儿童干预中的研究进展

在线全文

学校读者我要写书评

暂无评论

中国当代儿科杂志 2024年第4期26卷 414-419页

作者：郭乃绮(综述) 王瑜(审校) 上海交通大学医学院附属儿童医院上海市儿童医院儿童保健医学部康复科上海200062

孤独症谱系障碍(autism spectrum disorder,ASD)是儿童期神经发育障碍性疾病之一,目前治疗尚无特效方法,主要干预措施以教育训练和行为矫正为主。虚拟现实作为新兴技术,是一种以计算机为基础的环境模拟系统,通过融合多种来源信息实现交... 详细信息

孤独症谱系障碍(autism spectrum disorder,ASD)是儿童期神经发育障碍性疾病之一,目前治疗尚无特效方法,主要干预措施以教育训练和行为矫正为主。虚拟现实作为新兴技术,是一种以计算机为基础的环境模拟系统,通过融合多种来源信息实现交互式动态和沉浸式体验,近年逐渐被应用于ASD儿童干预训练。该文将综述虚拟现实在ASD儿童的情绪认知、社交能力、生活能力、运动能力、特殊恐惧方面的干预研究进展,为ASD干预训练拓展新方向。

关键词：孤独症谱系障碍虚拟现实干预儿童

Optimization of the Deployment of Temperature Nodes Based on Linear Programing in the Internet of Things

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2013年第3期18卷 250-258页

作者： liang Hu Zhengyu Zhang Feng Wang kuo Zhao the School of Computer Science and Technology Jilin University

The Internet of Things emphasizes the concept of objects connected with each other, which includes all kinds of wireless sensor networks. An important issue is to reduce the energy consumption in the sensor networks since sensor nodes always have energy constraints. Deployment of thousands of wireless sensors in an appropriate pattern will simultaneously satisfy the application requirements and reduce the sensor network energy consumption. This article deployed a number of sensor nodes to record temperature data. The data was then used to predict the temperatures of some of the sensor node using linear programming. The predictions were able to reduce the node sampling rate and to optimize the node deployment to reduce the sensor energy consumption. This method can compensate for the temporarily disabled nodes. The main objective is to design the objective function and determine the constraint condition for the linear programming. The result based on real experiments shows that this method successfully predicts the values of unknown sensor nodes and optimizes the node deployment. The sensor network energy consumption is also reduced by the optimized node deployment.

关键词： Internet of Things linear programming optimized node deployment energy consumption

Personalized Recommendation Algorithm Based on Preference Features

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2014年第3期19卷 293-299页

作者： liang Hu Guohang Song Zhenzhen Xie kuo Zhao the School of Computer Science and Technology Jilin University

A hybrid collaborative filtering algorithm based on the user preferences and item features is proposed.A thorough investigation of Collaborative Filtering （CF） techniques preceded the development of this *** proposed algorithm improved the user-item similarity approach by extracting the item feature and applying various item features＇ weight to the item to confirm different item *** preferences for different item features were obtained by employing user evaluations of the *** is expected that providing better recommendations according to preferences and features would improve the accuracy and efficiency of recommendations and also make it easier to deal with the data *** addition,it is expected that the potential semantics of the user evaluation model would be *** would explain the recommendation results and increase accuracy.A portion of the MovieLens database was used to conduct a comparative experiment among the proposed algorithms,i.e.,the collaborative filtering algorithm based on the item and the collaborative filtering algorithm based on the item *** Mean Absolute Error （MAE） was utilized to conduct performance *** experimental results show that employing the proposed personalized recommendation algorithm based on the preference-feature would significantly improve the accuracy of evaluation predictions compared to two previous approaches.

关键词： recommendation system collaborative filtering user preference

Flavonoids in safflower extract reduce cisplatin-induced damage to human follicle dermal papilla cells by inhibiting DNA damage and Rad17/Chk1/Cdc25C signaling

在线全文

学校读者我要写书评

暂无评论

BIOCELL 2023年第8期47卷 1793-1802页

作者： FU-MING TSAI PING-HSUN LU LU-KAI WANG CHAN-YEN kuo MAO-liang CHEN chun-HUA WANG Department of Research Taipei Tzu Chi HospitalBuddhist Tzu Chi Medical FoundationNew Taipei City231Taiwan Department of Chinese Medicine Taipei Tzu Chi HospitalBuddhist Tzu Chi Medical FoundationNew Taipei City231Taiwan School of Post-Baccalaureate Chinese Medicine Tzu Chi UniversityHualien970Taiwan Department of Life Sciences National Science and Technology CouncilTaipei106Taiwan Department of Dermatology Taipei Tzu Chi HospitalBuddhist Tzu Chi Medical FoundationNew Taipei City231Taiwan School of Medicine Tzu Chi UniversityHualien970Taiwan

Background:Cisplatin is a chemotherapeutic agent commonly used clinically for the treatment of various human *** often reduce the use of cisplatin due to its side effects,which in turn affects its *** study explored the mechanism of action of safflower extract as an adjuvant traditional Chinese medicine for ***:Primary human follicle dermal papilla cells(HFDPCs)were used as target cells for cisplatininduced damage to hair *** blotting was used to investigate the molecular targets of cisplatin and safflower extract in causing HFDPCs *** survival and cell cycle were analyzed by mitochondrial staining reagent WST-1 and propidium ***:Cisplatin could reduce the viability of HFDPCs without causing cell *** increased the level of phospho-Rad17 in HFDPCs and activated the Chk1/Cdc25C signaling to reduce the expression of Cdc2 protein,thereby arresting the cells in the G2/M *** combination of safflower extract and the flavonoids could effectively inhibit the signal transduction of Rad17/Chk1/Cdc25 in cisplatin-treated cells and reduce the cell population in the G2/M ***,we also confirmed that safflower extract could effectively inhibit the damage to HFDPCs caused by cisplatin,mainly at the level of reducing the DNA damage caused by ***:Safflower extract can be used as an adjuvant Chinese medicine for chemotherapy to reduce the damage caused by chemotherapy to normal hair follicle cells.

关键词： Safflower extract Cisplatin Human hair follicle dermal papilla cells Rad17 Hair loss Cell cycle

全双工主动窃听非正交多址接入系统智能超表面辅助物理层安全传输技术

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

电子与信息学报 2024年第3期46卷 798-807页

作者：阔永红曹琳吕璐贺冰涛陈健西安电子科技大学通信工程学院西安710071

针对全双工被动窃听和主动干扰攻击下的多用户非正交多址接入(NOMA)系统,该文提出一种智能超表面(RIS)辅助的鲁棒波束赋形方案以实现物理层安全通信。考虑在仅已知窃听者统计信道状态信息的条件下,以系统传输中断概率和保密中断概率作... 详细信息

针对全双工被动窃听和主动干扰攻击下的多用户非正交多址接入(NOMA)系统,该文提出一种智能超表面(RIS)辅助的鲁棒波束赋形方案以实现物理层安全通信。考虑在仅已知窃听者统计信道状态信息的条件下,以系统传输中断概率和保密中断概率作为约束,通过联合优化基站发射波束赋形、RIS相移矩阵、传输速率和冗余速率,来最大化系统的保密速率。为解决上述多变量耦合非凸优化问题,提出一种有效的交替优化算法得到联合优化问题的次优解。仿真结果表明,所提方案可实现较高的保密速率,且通过增加RIS反射单元数,系统保密性能更佳。

关键词：智能超表面非正交多址接入物理层安全波束赋形

System integration for on-machine measurement using a capacitive LVDT-Iike contact sensor

在线全文

学校读者我要写书评

暂无评论

Advances in Manufacturing 2017年第1期5卷 50-58页

作者： Yung-Tien Liu You-liang kuo Da-Wei Yan National Kaohsiung First University of Science andTechnology Kaohsiung 824 Taiwan China

In this study, an air-bearing capacitive linear variable differential transformer （LVDT）-like contact sensor with a rounded diamond tip was mounted to a desktop machine tool to construct an on-machine （OM） measuring system. The measuring system was capable of decoding the digital signals of linear encoders mounted on the machine tool and acquiring the analog signal of the contact sensor. To verify the measuring system, experimental examinations were performed on an oxygen-free copper （OFC） convex aspheric mold with a diameter of 5 mm and a curve height of 0.46 mm. The acquired signals were processed by the implemented Gaussian regression filter （GRF）, removing the tilt of measured profile, and compensating for the radius of probe tip. The profile obtained was compared to that measured using a commercially available device, and a maximum deviation of 14.6μm was found for the rough cutting. The compensation cutting was then performed according to the form error of OM measurement. As a result, the PV form error compared with the designed profile was reduced from 19.2μm over a measured diameter of 4 mm to 9.7 μm over a measured diameter of 3.1 mm, or a percentage improvement of 35.4% in form accuracy. Through the examination for aspheric machining, the effectiveness of the implemented OM measuring system was demonstrated, and the technical details of system implementation were presented. Further improvement was suggested to reduce the diameter of probe tip and measuring force.

关键词： On-machine (OM) measurement Gaussianregression filter (GRF) Aspheric ultraprecisionmachining Linear variable differential transformer(LVDT) Meso-machining

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

防压疮异形气囊枕垫及人体外压感知方法研究

机械设计 2024年第4期41卷 158-163页

作者：曹莹瑜王瑃黄军芬王伟毛雪松王阔北京石油化工学院机械工程学院北京102617

为解决规则形气囊枕垫设计算法不足及气囊外表面薄膜压力传感器的透气性和稳定性问题,提出一种防压疮异形气囊枕垫及基于气囊内压-高度模型的人体外压感知方法,通过建立异形气囊的压力-高度-外部载荷模型,测量异形气囊内压力和气囊高度... 详细信息

为解决规则形气囊枕垫设计算法不足及气囊外表面薄膜压力传感器的透气性和稳定性问题,提出一种防压疮异形气囊枕垫及基于气囊内压-高度模型的人体外压感知方法,通过建立异形气囊的压力-高度-外部载荷模型,测量异形气囊内压力和气囊高度,实现人体外压的推算和稳定感知,以及仰卧或俯卧位的压疮防治。试验结果表明:外压力误差为0.85 N,满足智能防压疮枕垫的压力控制精度。采用人体外压感知方法进行压力感知,避免采用压力薄膜传感器,为重症患者创造更舒适、更安全的护理环境。

关键词：压力检测气囊枕垫气囊模型压疮预防

Experimental and analytical study on design performance of full-scale viscoelastic dampers

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2018年第4期17卷 693-706页

作者： Shiang-Jung Wang I-Chen Chiu chung-Han Yu kuo-chun Chang Department of Civil and Construction Engineering Taiwan University of Science and Technology Taipei Chinese Taipei Department of Civil Engineering Taiwan University (NTU) Taipei Chinese Taipei Center for Research on Earthquake Engineering (NCREE) Taipei Chinese Taipei

Viscoelastic（VE） dampers, with their stiffness and energy dissipation capabilities, have been widely used in civil engineering for mitigating wind-induced vibration and seismic responses of structures, thus enhancing the comfort of residents and serviceability of equipment inside. In past relevant research, most analytical models for characterizing the mechanical behavior of VE dampers were verified by comparing their predictions with performance test results from small-scale specimens, which might not adequately or conservatively represent the actual behavior of full-scale dampers, especially with regard to the ambient temperature, temperature rise, and heat convection effects. Thus, in this study, by using a high-performance testing facility with a temperature control system, full-scale VE dampers were dynamically tested with different displacement amplitudes, excitation frequencies, and ambient temperatures. By comparing the analytical predictions with the experimental results, it is demonstrated that adopting the fractional derivative method together with considering the effects of excitation frequencies, ambient temperatures, temperature rises, softening, and hardening, can reproduce the design performance of full-scale VE dampers very well.

关键词： viscoelastic damper full-scale designperformance dynamic test fractional derivative model