检索结果-内蒙古大学图书馆

3T2M canted-type x SOT-MRAM: Field-free, high-energy-efficiency, and high-read-margin memory toward cache applications

引用

JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES 2022年第4期7卷

作者： Liu, Long Wang, Di Lin, Huai Zhao, Xuefeng Wang, Ziwei Xu, Nuo Luo, Xi Gao, Nan Xue, Xiaoyong Pan, Cheng Xie, Changqing Xing, Guozhong Chinese Acad Sci Key Lab Microelect Devices & Integrated Technol Inst Microelect Beijing 100029 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Univ Sci & Technol China Sch Microelect Hefei 230026 Peoples R China Univ Calif Berkeley Dept Elect Engn & Comp Sci Berkeley CA 94720 USA Cent Iron and Steel Res Inst Dept Funct Mat Res Beijing 100081 Peoples R China Fudan Univ State Key Lab ASIC & Syst Sch Microelect Shanghai 201203 Peoples R China Beijing Smart Chip Microelect Technol Co Ltd State Grid Key Lab Power Ind Chip Design & Anal Te Beijing Peoples R China

We propose a novel cell structure of spin-orbit torque (SOT) magnetic random-access memory (MRAM), which consists of three transistors and two canted-type x SOT magnetic tunnel junctions (3T2M) with opposite canting angle (+phi/phi) on a shared heavy-metal, enabling a self-referencing scheme. Owing to the canting-angle-dependent switching polarity, the 3T2M unit keeps switching to complementary states without any complex structure, corroborating an excellent application potential for practical CMOS integration. Moreover, upon tailoring the canting angle and the ratio of field-like over damping-like torque in the free layer, the developed architecture demonstrates efficient and reliable field-free magnetization switching with a significantly improved read sensing margin (230 mV and 160 mV for reading "1" and "0") and outstanding thermal stability (Delta similar to 70). The 3T2M cell exhibits 0.25 ns ultra-fast write speed, a 6 x reduced write energy of 35.41 fJ, and 23.65 fJ for "1" and "0" than the state-of-the-art. (C) 2022 Vietnam National University, Hanoi. Published by Elsevier B.V.

关键词： Spin-orbit torque Canted type-x MTJ SOT-MRAM Sensing margin Reliability

来源：评论

学校读者我要写书评

暂无评论

Fabrication and Characterization of MoS2/h-BN and WS2/h-BN Heterostructures

引用

MICROMACHINES 2020年第12期11卷 1114-1114页

作者： Han, Tao Liu, Hongxia Chen, Shupeng Chen, Yanning Wang, Shulong Li, Zhandong Xidian Univ Sch Microelect Key Lab Wide Band Gap Semicond Mat & Devices Educ Xian 710071 Peoples R China Beijing Smart Chip Microelect Technol Co Ltd State Grid Key Lab Power Ind Chip Design & Anal T Beijing 100192 Peoples R China

The general preparation method of large-area, continuous, uniform, and controllable vdW heterostructure materials is provided in this paper. To obtain the preparation of MoS2/h-BN and WS2/h-BN heterostructures, MoS2 and WS2 material are directly grown on the insulating h-BN substrate by atmospheric pressure chemical vapor deposition (APCVD) method, which does not require any intermediate transfer steps. The test characterization of MoS2/h-BN and WS2/h-BN vdW heterostructure materials can be accomplished by optical microscope, AFM, Raman and PL spectroscopy. The Raman peak signal of h-BN material is stronger when the h-BN film is thicker. Compared to the spectrum of MoS2 or WS2 material on SiO2/Si substrate, the Raman and PL spectrum peak positions of MoS2/h-BN heterostructure are blue-shifted, which is due to the presence of local strain, charged impurities and the vdW heterostructure interaction. Additionally, the PL spectrum of WS2 material shows the strong emission peak at 1.96 eV, while the full width half maximum (FWHM) is only 56 meV. The sharp emission peak indicates that WS2/h-BN heterostructure material has the high crystallinity and clean interface. In addition, the peak position and shape of IPM mode characteristic peak are not obvious, which can be explained by the Van der Waals interaction of WS2/h-BN heterostructure. From the above experimental results, the preparation method of heterostructure material is efficient and scalable, which can provide the important support for the subsequent application of TMDs/h-BN heterostructure in nanoelectronics and optoelectronics.

关键词： APCVD MoS2 h-BN heterostructure WS2 h-BN heterostructure spectral characteristics

来源：评论

学校读者我要写书评

暂无评论

Short-Term Load Forecasting Based on Deep Learning for End-User Transformer Subject to Volatile Electric Heating Loads

引用

IEEE ACCESS 2019年 7卷 162697-162707页

作者： Chen, Qifang Xia, Mingchao Lu, Teng Jiang, Xichen Liu, Wenxia Sun, Qinfei Beijing Jiaotong Univ Sch Elect Engn Beijing 100044 Peoples R China Western Washington Univ Dept Engn & Design Bellingham WA 98225 USA North China Elect Power Univ State Key Lab Alternate Elect Power Syst Renewabl Beijing 102206 Peoples R China State Grid Beijing Elect Power Co Beijing 100031 Peoples R China

Short-Term Load Forecasting (STLF) for End-User Transformer Level (EUTL) is challenging due to the high penetration of Electric Heating Loads (EHLs), which exhibit significant uncertainty, nonlinearity, and variability. In this paper, a STLF model is proposed based on the Stacked Auto-Encoder Extreme Learning Machine (SAE-ELM) deep learning framework, which can be used to extract hidden features from the time series load data. In order to improve the capability of extracting deep and diverse features from the data and generate a useful knowledge representation structure, a novel specialized feature indices set is proposed to construct the training sample set. The sliding trend, fluctuation rate, grade of change, and smoothness of the time series are considered and quantified as elements of the training sample set. Then, deep nonlinear features are extracted by using the SAE-ELM with no iterative parameter tuning needed. To illustrate the validity of the proposed model, five numerical cases are conducted. Comparison of results shows that the proposed model improves the capability and sensitivity of dealing with load volatility and forecasting accuracy.

关键词： Short-term load forecasting feature representation deep learning stacked auto-encoder extreme learning machine

来源：评论

学校读者我要写书评

暂无评论

Short-Term Flexural Behavior of Prestressed Glulam Beams Reinforced with Curved Tendons

引用

JOURNAL OF STRUCTURAL ENGINEERING 2020年第6期146卷

作者： Zhang, Jin Shen, Hao Qiu, Ronggen Xu, Qingfeng Gao, Sen Southeast Univ Minist Educ Key Lab Concrete & Prestressed Concrete Struct Nanjing 211189 Peoples R China East China Architectural Design & Res Inst Co Ltd 151 Hankou Rd Shanghai 200002 Peoples R China Nanjing Dong Da Modern Prestressed Engn Co Ltd 136 North Taiping Rd Nanjing 210048 Peoples R China Shanghai Res Inst Bldg Sci Co Ltd Shanghai Key Lab Engn Struct Safety 75 South Wanping Rd Shanghai 200032 Peoples R China State Grid Yangzhou Power Supply Co 179 Weiyang Rd Yangzhou 225000 Jiangsu Peoples R China

The short-term flexural behavior of prestressed glulam beams reinforced with curved tendons was investigated via four-point bending of 12 glulam beams. These beams were equally divided into four groups of three identical specimens: one group of unreinforced beams, one group of prestressed beams reinforced with straight tendons, and two groups of prestressed beams reinforced with parabolic tendons. For the last two groups, the initial prestress force was applied in two levels. The results revealed that, in contrast to the failure mode of the unreinforced beams, the failure mode of the prestressed beams changed from brittle failure to ductile failure. The flexural capacity and the flexural stiffness of the prestressed glulam beams reinforced with straight tendons increased by 56.9% and 14.9%, respectively, compared with that of the unreinforced beams;for prestressed beams reinforced with parabolic tendons, the capacity and the stiffness increased by 54.4%-75.5% and 14.2%-15.5%, respectively. Based on the experimental results, a theoretical model for predicting the flexural stiffness and capacity of prestressed glulam beams was proposed. This model was validated with the test data. (C) 2020 American Society of Civil Engineers.

关键词： Glulam beams Prestressed Parabolic tendons Short-term flexural behavior Experimental study

来源：评论

学校读者我要写书评

暂无评论

The design and Optimization of a Wireless power Transfer System Allowing Random Access for Multiple Loads

引用

ENERGIES 2019年第6期12卷 1017-1017页

作者： Tan, Linlin Zhang, Ming Wang, Songcen Pan, Shulei Zhang, Zhenxing Li, Jiacheng Huang, Xueliang Southeast Univ Sch Elect Engn 2 Sipailou Nanjing 210096 Jiangsu Peoples R China Zhifang Engn Design Co Ltd Nanjing 210014 Peoples R China Key Lab Smart Grid Technol & Equipment Jiangsu Pr 2 Sipailou St Nanjing 210096 Jiangsu Peoples R China State Grid China Elect Power Res Inst Beijing 100192 Peoples R China State Grid Yancheng Power Supply Co 189 Jiefang South Rd Yancheng 224000 Peoples R China

As is common in multi-load wireless power transfer (WPT) systems based on series-series compensation topology, the power received by loads and the efficiency of the process are highly sensitive to changes in the number of loads. To guarantee that the power supplied to a load remains stable when other loads access or leave the system, we propose an improved multi-load system for WPT. The new system uses an LCC/S topology (based on inductor-capacitor-inductor or LCL topology) to keep the power received by the loads stable. By comparing two scenarios (ideal and real models based on LCC/S topology), we aim to eliminate cross-coupling between receiving coils by connecting compensating capacitors in series on the receiving side. In this way, the stability of the power received by loads is further improved. Moreover, a method of optimizing control over the efficiency is proposed based on the effect on the overall efficiency of impedance and number of loads. This allows us to optimize the overall efficiency of the system. Finally, a system to verify our theoretical analysis is established and used to show the validity and effectiveness of the proposed system.

关键词： wireless power transfer (WPT) multiple loads LCC S topology efficiency optimization power stabilization

来源：评论

学校读者我要写书评

暂无评论

An instruction based automatic workflow testing method for security chip

An instruction based automatic workflow testing method for s...

引用

IEEE International Conference on Automation, Electronics and Electrical Engineering (AUTEEE)

作者： Jing Zhou Qingqin Fu Jia Liu Rui Wang Xuesong Bai Beijing Chip Microelectronics Technology Co. Ltd. Key Lab of Power Grid Design and Analysis State Grid Corporation of China Beijing China

ISBN: (数字)9781728150307

ISBN: (纸本)9781728150314

This paper analyzes the faults of traditional workflow testing of security chip, and proposes a new automatic workflow testing for security chip. This method is based on instruction processing and encapsulates 645 protocol, to simulate the workflow of main station, security chip and electric energy meter. Comparing to traditional method, it overcomes the disadvantages that traditional workflow has no interactive testing with real energy meter which may lead to faults when testing on the real energy meter. Meanwhile, it advances the schedule of the smoke test and realizes the workflow modularization, greatly improves the efficiency of the workflow test and regression test.

关键词： Testing Meters Software Automation Protocols Ciphers

来源：评论

学校读者我要写书评

暂无评论

Technology Research on the Application of High Safety Anti-Metal RFID Tags in the Asset Management of power Equipment

Technology Research on the Application of High Safety Anti-M...

引用

International Conference on Artificial Intelligence and Advanced Manufacturing (AIAM)

作者： Jia Liu Qingqin Fu Yubo Yuan Jianfeng Fu Beijing Chip Microelectronics Technology Co. Ltd. Key Lab of Power Grid Design and Analysis State Grid Corporation of China Beijing China

The power equipment assets has the characteristics of large initial investment, high operation cost, long service time. Therefore it is the basic requirement to carry out the electrical equipment life cycle management to ensure the grid assets safety running. Using security Ultra High Frequency (UHF) Radio Frequency Identification (RFID) anti metal tag as the equipment asset identification, it is useful to ensure the legitimacy of reader and tag, and the security of data storage and transmission, and the personnel authority access control. In this paper, the characteristics, working principle and working flow of high security RFID electronic tags are designed and studied. The typical solution is provided for the intelligent management of grid assets.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Prediction of high frequency trading financial data using stacked LSTMs for algorithmic trading 5

Prediction of high frequency trading financial data using st...

引用

5th International Conference on Fuzzy Systems and Data Mining, FSDM 2019

作者： Liu, Jun Fu, Qingqin Yilmaz, Onur NVIDIA Co. Ltd Deep Learning Institute Beijing100020 China BeijingSmartchip Microelectronics Technology Co. Ltd. Key Lab of Power Grid Design and Analysis State Grid Corporation of China Beijing100192 China NVIDIA Co. Ltd Deep Learning Institute New YorkNY10003 United States

ISBN: (纸本)9781643680187

This paper is focuses on the prediction of high frequency trading time series financial data using stacked LSTMs model for investment strategies in algorithmic trading. The goal is to give a deep learning (DL) approach that can be potentially beneficial to the complex investment strategies in algorithmic trading. This paper is not a complete investment strategy that generates a profit and loss curve (PNL). Rather, it shows how LSTM based deep neural networks can be applied to predict time series financial data. It can predict the asset prices or asset returns, and the generated predictions can be used to make certain decisions such as open a long position or close the short position. © 2019 The authors and IOS Press. All rights reserved.

关键词： Time series

来源：评论

学校读者我要写书评

暂无评论

Multiparametric Finite-Element Simulation and Experiment on Thermal Effects in Skin Tumor Exposed to High-Frequency Nanosecond Pulse Bursts

引用

IEEE TRANSACTIONS ON PLASMA SCIENCE 2019年第1期47卷 924-934页

作者： Mi, Yan Peng, Wencheng Rui, Shaoqin Bian, Changhao Tang, Xuefeng Xu, Jin Kuang, Dongdong Luo, Qing Chongqing Univ Sch Elect Engn State Key Lab Power Transmiss Equipment & Syst Se Chongqing 400044 Peoples R China State Grid Tianjin Power Maintenance Co Tianjin 300010 Peoples R China State Grid Jiangsu Elect Power Co Technician Training Ctr Suzhou 215004 Peoples R China Sichuan Elect Power Design & Consulting Co Ltd Chengdu 610041 Sichuan Peoples R China Genrix Biopharmaceut Co Ltd Chongqing 401338 Peoples R China Chongqing Univ Sch Bioengn Chongqing 400044 Peoples R China

This paper introduces unipolar high-frequency nanosecond pulse bursts, which combine the advantages of microsecond pulsed electric fields and nanosecond pulsed electric fields, for the treatment of tumors. To take full advantage of this nonthermal pulsed electric field treatment, it is necessary to study the thermal effects of the high-electric-field nanosecond pulse bursts inside tumor tissue. A multiparametric analysis is performed based on a finite-element model of skin with a melanoma tumor that is nipped using the Tweezertrodes. The electric field ranges from 1 to 10 kV/cm, the pulsewidth ranges from 50 to 500 ns, and the frequency in the pulse bursts ranges between 100 kHz and 1 MHz. The total pulselength is 100 mu s, and the frequency of the pulse bursts is 1 Hz. The Pennes bioheat transfer equation and the Arrhenius equation are used to calculate the temperature and the thermal damage. For pulse parameters of 5 kV/cm, 500 ns, and 1 MHz, the simulated temperature of the skin tumor is only 37.48 degrees C after 1 s, and the thermal damage is negligible. The temperature and thermal damage to the melanoma tumor in the skin are simulated and calculated for various electric fields, pulse widths, and frequencies. The relationship between the thermal effects on the tumor and the pulse parameters is researched, and pulse parameters for a tumor without thermal damage are ascertained. Temperature measurements of melanoma tumors in nude mice in vivo show that the change in experimental temperature in the tumors is consistent with the simulated average tumor temperature.

关键词： Finite-element method high-frequency nanosecond pulse bursts temperature thermal damage tumor

来源：评论

学校读者我要写书评

暂无评论

Two-stage multi-fault emergency rush repair and restoration robust strategy in distribution networks

引用

ELECTRIC power SYSTEMS RESEARCH 2020年 184卷 106335-000页

作者： Zhao, Hao Lu, Zhigang He, Liangce Guo, Xiaoqiang Li, Xueping Xiao, Haifeng Tianjin Elect Power Design Inst Co Ltd China Energy Engn Grp Tianjin 300400 Peoples R China Yanshan Univ Key Lab Power Elect Energy Conservat & Motor Dr H Haigang 066004 Hebei Peoples R China State Grid Jibei Elect Power Co Ltd Zhangjiakou Power Supply Co Zhangjiakou 075000 Hebei Peoples R China

The multi-fault emergency rush repair and restoration in distribution networks is a discrete dynamic combinatorial problem with topology constraints. The fault repairing time cannot be exactly predicted in advance. To accommodate the uncertainty of the repairing time, it is assumed as a symmetric and bounded random variable, which takes values in a given interval. Then a two-stage robust multi-fault rush repair and restoration optimization model is developed to determine the robust repairing strategy in order to minimize the outage loss and total repairing time. In the first stage, the optimal repairing and restoration strategy is obtained and the second stage discovers the worst-case repairing time contingency scenario in the predicted uncertainty set. By utilizing linearization method and duality theory, the robust model is reformulated as a mixed-integer linear program problem. Also an uncertainty budget is used to coordinate the optimality and conservatism of the proposed model. Column-and-constraint generation algorithm is used to solve the proposed model to generate the optimal robust repairing and restoration strategy. Finally, this approach is tested on a modified Pacific Gas and Electric Company (PG&E) 69-bus distribution network and a modified 119-bus system. The simulation results show the robustness and effectiveness of the proposed approach.

关键词： Restoration Multi-fault rush repair Repairing time uncertainty Two-stage Robust optimization

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：