检索结果-内蒙古大学图书馆

Practice of flow control and smart valves

Journal of Zhejiang University-Science A(Applied Physics & engineering) 2022年第4期23卷 243-246页

作者： Jin-yuan QIAN Wei WU Min CHENG Jun-hui ZHANG Institute of Process Equipment College of Energy EngineeringZhejiang UniversityHangzhou 310027China School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China School of Mechanical and Vehicle Engineering Chongqing UniversityChongqing 400044China Institute of Mechatronics and Control Engineering Zhejiang UniversityHangzhou 310027China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China

Introduction The usual metaphors of“heart”and“throat”indi-cate the importance of pumps and valves in industrial systems including petroleum,chemical,metallurgy,aviation,and *** the continuous penetra-tion of the industrial internet,the miniaturization,digi-tization,multi-functionalization,and systemization of valves have become very important(Si et al.,2020;Chang et al.,2021;Pang et al.,2021;Bonilla et al.,2022;Yuan et al.,2022;Zhao et al.,2022).

关键词： smart internet flow

来源：评论

学校读者我要写书评

暂无评论

Effect of Substrate Temperature on Structure of Vacuum Evaporated Zinc-Magnesium Alloy Coating 3

Effect of Substrate Temperature on Structure of Vacuum Evapo...

引用

2022 3rd International Conference on Mechanical engineering and Materials, ICMEM 2022

作者： Liu, Xin Qiu, Xiaopan Liu, Qiuyuan Xiong, Aiming Teng, Huaxiang Jiang, Guangrui Zhang, Wendong Jiang, Sheming Zhang, Qifu National Engineering Laboratory of Advanced Coating Technology for Metals Central Iron and Steel Research Institute Group Beijing100081 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Shougang Group Co. Ltd Research Institute of Technology Beijing100043 China Linqu Inspection and Testing Center Shandong Linqu262600 China

In order to solve the problem that the poor plating ability of Galvanized ultra-high strength steel automobile sheet made by traditional continuous hot-dip galvanizing method and the problem that it is difficult to prepare high magnesium (more than 3%) content coated steel sheet by traditional continuous hot-dip galvanizing method. In this chapter, Zn-Mg coating was evaporated at substrate temperature of 50 °C, 100 °C, 150 °C and 200 °C by double source co-evaporation method, and the microstructure and adhesion of single-layer Zn Mg coating were analyzed. The results show that, with the increasing of substrate temperature, the surface grains of zinc magnesium coating have a trend of increasing gradually, but the adhesion of the coating has a trend of decreasing, among which ZnMg-100 coating has the best adhesion. © Published under licence by IOP Publishing Ltd.

关键词： Adhesion

来源：评论

学校读者我要写书评

暂无评论

Degradation of Chlorinated Volatile Organic Compounds in Waste Gas by Catalytic Plasma System

SSRN

引用

SSRN 2024年

作者： Yen, Yi Wu, Jeffrey C.S. Zhang, Xiangping Bai, Yinge Huang, Chao-Wei Nguyen, Van-Huy Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan State Key Laboratory of Mesoscience and Engineering Beijing Key Laboratory of Ionic Liquids Clean Process Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Department of Engineering Science National Cheng Kung University No.1 Daxue Rd. East District Tainan City701401 Taiwan Centre for Herbal Pharmacology and Environmental Sustainability Chettinad Hospital and Research Institute Chettinad Academy of Research and Education Tamil Nadu Kelambakkam603103 India

Dichloromethane (DCM), one of the main components of chlorinated volatile organic compounds (Cl-VOCs), is recognized as extremely hazardous and severely affects human health and the environment. In this study, a self-designed Dielectric Barrier Discharge (DBD) reactor combined with different catalysts to treat the exhaust DCM gas containing ppm concentration levels. A plasma system can generate high-energy electrons and free radicals (OH·, O2·) to degrade DCM in the industrial exhaust gas into most HCl and CO2. The removal efficiency can achieve 98.7% under the conditions, flow rate 1042 mLmin-1, residence time 76.72 ms, concentration of DCM about 1650 ppm, and specific input energy 591 JL-1. Although the plasma was highly reactive, the selectivity of the desired products was low, and there were unwanted toxic byproducts such as CHCl3 (1.7%) and CCl4 (13.8%). Thus catalysts were loaded in the plasma discharging zone to enhance removal efficiency and change product distribution. The catalysts were conducive to producing water-soluble products such as HCl. At the same time, the formation of some unwanted byproducts, CHCl3 and CCl4, were also inhibited. We found that using 11.5 kVpp plasma operating voltage combined with 200 mg Co3O4/HZSM-5 can lower the concentration of the outlet stream from 1650 ppm to 53 ppm. Under this condition, the removal efficiency was about 96.7%, attaining permitted emissions. © 2024, The Authors. All rights reserved.

关键词： Dielectric barrier discharge

来源：评论

学校读者我要写书评

暂无评论

Robustly stable intermediate memory states in HfO_(2)-based ferroelectric field-effect transistors

引用

Journal of Materiomics 2022年第3期8卷 685-692页

作者： Chen Liu Binjian Zeng Siwei Dai Shuaizhi Zheng Qiangxiang Peng Jinjuan Xiang Jianfeng Gao Jie Zhao Jincheng Zhang Min Liao Yichun Zhou Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtan411105China College of Civil Engineering and Mechanics Xiangtan UniversityXiangtan411105China School of Advanced Materials and Nanotechnology Xidian UniversityXi'an710071China Integrated Circuit Advanced Process R&D Center and Institute of Microelectronics of Chinese Academy of Sciences Beijing100029China State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXi'an710071China

Multilevel ferroelectric field-effect transistors(FeFETs)integrated with HfO_(2)-based ferroelectric thin films demonstrate tremendous potential in high-speed massive data storage and neuromorphic computing ***,few works have focused on the stability of the multiple memory states in the HfO_(2)-based *** we firstly report the write/read disturb effects on the multiple memory states in the Hf_(0.5)Zr_(0.5)O_(2)(HZO)-based *** multiple memory states in HZO-based FeFETs do not show obvious degradation with the write and read disturb ***,the retention characteristics of the intermediate memory states in HZO-based FeFETs with unsaturated ferroelectric polarizations are better than that of the memory state with saturated ferroelectric *** the deep analysis of the operation principle of in HZO-based FeFETs,we speculate that the better retention properties of intermediate memory states are determined by the less ferroelectric polarization degradation and the weaker ferroelectric polarization *** experimental and theoretical evidences confirm that the long-term stability of the intermediate memory states in HZO-based FeFETs are as robust as that of the saturated memory state,laying a solid foundation for their practical applications.

关键词： Ferroelectric fieldeffect transistors(FeFETs) Hf_(0.5)Zr_(0.5)O_(2)(HZO) Multiple memory states Write/read disturb Retention

来源：评论

学校读者我要写书评

暂无评论

Stretchable asymmetric dual-atom Cu(I) electrocatalyst for enhanced CO₂ reduction to C₂₊ products

Chem Catalysis

引用

Chem Catalysis 2025年第6期5卷

作者： Bu, Ran Jia, Shuaiqiang Pei, YuHou Xu, Danyun Li, Di Ruan, Qidong Liu, Yuting Mu, Pengfei Gao, Enqing Lu, Yingying Zhang, Bing State Key Laboratory of Chemical Engineering Institute of Pharmaceutical Engineering College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou 311215 China Shanghai Key Laboratory of Green Chemistry and Chemical Processes State Key Laboratory of Petroleum Molecular & Process Engineering School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Zhejiang Institute of Tianjin University Shaoxing 312300 China

Constructing precise catalytic sites and local microenvironments to achieve electrochemical CO2 conversion to valuable C2+ products remains a great challenge. Here, a porous crystalline covalent organic framework (COF... 详细信息

Constructing precise catalytic sites and local microenvironments to achieve electrochemical CO₂ conversion to valuable C₂₊ products remains a great challenge. Here, a porous crystalline covalent organic framework (COF) containing Br-bridged dual single-atom Cu(I) sites with an asymmetric coordination environment was rationally designed and confirmed by combining single-crystal X-ray diffraction and X-ray absorption fine structure analyses. The as-synthesized COF-based single-atom Cu catalyst exhibits exceptional performance in the electrochemical CO₂ reduction reaction to C₂₊ products, which surpasses that of most previously reported single-atom catalysts with defined coordination structures. Operando Raman spectroscopy, theoretical calculations, and control experiments were employed to verify the mechanism behind the effectiveness of the catalyst. These investigations suggest that the flexible, asymmetrically coordinated dual-atom Cu(I) sites can lower the energy barrier for generating ∗CO and ∗COCHO intermediates, thereby promoting the formation of C–C bonds necessary for C₂₊ products. © 2025 Elsevier Inc.

关键词： atomic sites CO2 reduction reaction covalent organic frameworks electrocatalysts multicarbon products SDG7: Affordable and clean energy

来源：评论

学校读者我要写书评

暂无评论

Development of a hazard index for reactivity management (HIRM) in chemical process

引用

process Safety and Environmental Protection 2021年 149卷 22-34页

作者： Sun, Feng Xu, Wei Wang, Guangjian Shi, Ning Yang, Zhe Department of Chemical Process Safety Research SINOPEC Research Institute of Safety Engineering 218 Yanansan Road Qingdao266071 China College of Chemical Engineering Qingdao University of Science & Technology 53 Zhengzhou Road Qingdao266042 China State Key Laboratory of Safety and Control for Chemicals SINOPEC Research Institute of Safety Engineering 218 Yanansan Road Qingdao266071 China

The management of reactivity hazards has long been a problem in chemical process and the indexing approach is believed to be an effective solution. However, while most of the reactivity indexes do not consider the runaway scenario and are often quite rough, the assessment criteria used to judge thermal runaway does not take the type of scenario or the severity of the consequences into account. At present, there are no index system that can represent the reactivity hazards in chemical process comprehensively. Therefore, this paper has developed a hazard index for reactivity management (HIRM) in chemical processes. The reactivity hazards could be identified, evaluated and managed through nine steps defined by this method. The HIRM method is able to assess various runaway scenarios and quantify the reactivity hazards based on the consequence and probability. The consequence is rated by the damage radius which represents the damage level caused by fire, explosion, and toxic release due to reaction runaway. The probability indicates the initial event frequency, the initiation time and the controllability of the entire runaway process. The reactivity risks could then be classified by the HIRM index uniformly and comprehensively, with methods to manage the risks proposed. Six sets of equipment in the dicumyl peroxide (DCP) production unit was used as an example to demonstrate the construction of the HIRM index system. The results showed good agreement with the actual risk distribution, meaning that the HIRM method is an effective tool for the management of reactivity hazards in chemical process. © 2020

关键词： Peroxides

来源：评论

学校读者我要写书评

暂无评论

Investigation of Hydraulic Behavior in a Gas-Agitated Disc and Doughnut Column for Solvent Extraction

SSRN

引用

SSRN 2024年

作者： Wang, Chi Xu, Dongbing Tan, Boren Chang, Chao Wang, Chenye Wang, Yong Xing, Peng Li, Huiquan Gui, Xiahui Yang, Jianguo State Key Laboratory of Coking Coal Resources Green Exploitation China University of Mining and Technology Xuzhou221116 China School of Chemical Engineering and Technology China University of Mining and Technology Xuzhou221116 China CAS Key Laboratory of Green Process and Engineering National Engineering Research Center of Green Recycling for Strategic Metal Resources Institute of Process Engineering Chinese Academy of Sciences Beijing100090 China University of Chinese Academy of Sciences Beijing100049 China Monash University Australia Nanjing IPE Institute of Green Manufacturing Industry China

The gas-agitated extraction column represents a novel extraction technology that employs gas to break-up droplets. Hydraulic characteristics, including droplet size (d32), dispersed-phase holdup (xd), and gas holdup (xg), are critical for design and scaling-up of extraction columns. These parameters were evaluated using a 30 mm disc-and-doughnut column (DDC) equipped with a gas-input unit. The water as dispersed-phase and tributyl phosphate (TBP)/kerosene as continuous-phase. The results show that when no gas is introduced, the countercurrent cannot be maintained, and reach flooding directly. Once gas is introduced, the flow state returns to normal. Results indicate that d32 diminishes with increasing gas-velocity, suggesting that gas can act as a substitute energy for droplet fragmentation. The xd initially decreases and then increases with greater gas-velocity, while increasing with the velocities of two-phases. xg only increases with gas-velocity. Empirical correlations for d32, xd, and xg are proposed with deviations of 11.59%, 15.85%, and 4.29%, respectively. © 2024, The Authors. All rights reserved.

关键词： Gases

来源：评论

学校读者我要写书评

暂无评论

Lognormal and Gamma mixed negative binomial model for defects prediction in steel products 10

Lognormal and Gamma mixed negative binomial model for defect...

引用

10th IEEE Data Driven Control and Learning Systems Conference, DDCLS 2021

作者： He, Bocun Wei, Chihang Zhu, Zheren Zhang, Xinmin Song, Zhihuan State Key Laboratory of Industrial Control Technology Institute of Industrial Process Control College of Control Science and Engineering Zhejiang University Zhejiang Hangzhou310027 China

ISBN: (纸本)9781665424233

In steel industry, variations in the manufacturing process cause various defects in products. Thus, it is important to forecast the instance of defects in real time. However, ordinary probability models are not adequate enough to describe the observed defect count data due to the nonnegative integers characteristics, high imbalanced distribution, and overdispersion. To explicitly account for these distinctive characteristics, the present work proposes an online quality forecast system developed on the lognormal and Gamma mixed negative binomial (LGNB) model. LGNB incorporates the lognormal and Gamma distributions to account for the random effect and dispersion in the data. In addition, the drawbacks of the ordinary negative binomial (NB) model such as low robustness and biased parameter estimation against data with large dispersion are conquered by the LGNB model. The efficacy of the LGNB model was validated via its application to the defect data of an ironmaking plant. The results show that the LGNB model improves the forecast accuracy as compared to the PLS, Poisson, and NB models, respectively. © 2021 IEEE.

关键词： Defects

来源：评论

学校读者我要写书评

暂无评论

Novel application of red mud as disposal catalyst for pyrolysis and gasification of coal

引用

Carbon Resources Conversion 2021年第1期4卷 10-18页

作者： Zhaohui Chen Deliang Wang Hang Yang Yusheng Zhang Yunjia Li Changming Li Jian Yu Shiqiu Gao State Key Laboratory of Multi-phase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China Chemical Engineering Polytechnique MontrealMontrealQC H3C 3A7Canada

Red mud(RM)with the high alkalinity as a catalyst was evaluated for coal pyrolysis in a fixed bed as well as CO_(2) gasification of its resultant char in a thermogravimetric analyzer(TGA).The addition of RM into coal could improve the quality of tar during pyrolysis and enhance the reactivity of char during *** catalytic pyrolysis with 12 wt%RM at 600℃,the light fraction in tar was 72.0 wt%,which increased by 20.0%,compared with coal pyrolysis *** role of metal oxides in RM on coal pyrolysis was further clarified as *** catalytic pyrolysis with RM,the specific surface area of resultant char increased,especially for mesoporous surface area,and meanwhile the sodium in RM was proved to migrate to the char *** positive factors contributed to the CO_(2) gasification activity of *** with the high alkalinity showed a promising catalyst candidate for coal pyrolysis and gasification in terms of its catalytic effects and low cost.

关键词： Catalytic coal pyrolysis Red mud Tar upgrading Metal oxides Sodium migration Catalytic gasification

来源：评论

学校读者我要写书评

暂无评论

Robust Control for a Class of Nonlinear Systems Against Denial-of-Service Attacks

Robust Control for a Class of Nonlinear Systems Against Deni...

引用

2021 China Automation Congress, CAC 2021

作者： Ding, Wei Zhang, Jin-Xi Faculty of Electrical Engineering and Automation Changshu Institute of Technology Changshu China State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang China

ISBN: (纸本)9781665426473

This paper explores the state-feedback control problem for a family of nonlinear systems subject to denial-of-service (DoS) attacks. The unknown nonlinearities and DoS attacks involved in the closed loop render the existing approaches for resilient control of linear systems or robust nonlinear control infeasible. A solution is provided by designing a novel robust control scheme together with a constraint-handling technique. Two technical lemmas are also given to establish the boundedness of the signals in the resulting control system. As a distinct property, our approach is flexible enough such that the system reaches a predefined steady state in a specified time after the occurrence of DoS attacks. © 2021 IEEE

关键词： Denial-of-service attack

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：