Dong Xu

Zhejiang University of Water Resource and Electric Power

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Laifeng Li

Technical Institute of Physics and Chemistry

Sujuan Zhong

Zhengzhou Institute of Machinery

Lei Jiao

Jiangsu University

Rongjin Huang

Technical Institute of Physics and Chemistry

Huiming Liu

Technical Institute of Physics and Chemistry

Juan Liu

Peking University

Zhan Cheng

Nanjing University of Aeronautics and Astronautics

Bing Cui

Anhui University of Technology

Shi Feng Huang

University of Jinan

Liyi Shi

Shanghai University

Cooperative Institutions

Chinese Academy of Sciences

207

University of Chinese Academy of Sciences

Anhui University of Technology

Jiangsu University

Technical Institute of Physics and Chemistry

Fudan University

Central South University

University of Electronic Science and Technology of China

Tsinghua University

Jilin University

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A novel U-shaped meander-line slow wave structure for Ka-band TWT

IET conference proceedings. (2022)

Y. Wang Yuhui Dong H. wang Dong Xu S. wang

In this paper, a novel U-shape meander-line slow wave structure (MLSWS) is proposed for the miniaturization of millimeter-wave traveling-wave tubes (TWTs). This slow wave structure can effectively reduce the working voltage. The dispersion and transmission characteristics of the SWS have been analyzed. According to the simulation results, when the working voltage and current of 10 kV and 160 mA respectively, 176.7 W output power can be obtained at 37 GHz.

Ka band

Traveling-wave tube

Meander (mathematics)

Extremely high frequency

Line (geometry)

10.1049/icp.2022.0985

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Citations (0)

Study on flow characteristics of the cryogenic throttle valve for superfluid helium system

Cryogenics (2024)

Qianxi Qu Liguo Wang Huan Chen Niannian Dai Peng Jia

Throttle

Bandwidth throttling

Internal flow

10.1016/j.cryogenics.2024.103797

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Citations (3)

NNASIM: An Efficient Event-Driven Simulator for DNN Accelerators with Accurate Timing and Area Models

2022 IEEE International Symposium on Circuits and Systems (ISCAS) (2022)

Xiaoling Yi YU Jiang-nan Zheng Wu Xiankui Xiong Dong Xu

In this paper, we propose NNASIM, an efficient timing and area accurate event-driven simulator for custom DNN accelerators. NNASIM is a highly-modular and highly parameterized modeling framework. We build accurate timing and area models for common accelerator modules like GEMM, ALU array, and crossbar using ASIC synthesis flows. These models are fed into the event-driven simulator for fast simulation. NNASIM is integrated with a RISC-V simulator. This approach guarantees the functional correctness of the accelerator simulation at the instruction level. The experimental results show that our model evaluates the performance and area of DNN accelerators with less than 0.76% and 2.83% error, respectively, compared to RTL implementations. NNASIM allows designers to model the performance and area of the accelerator at a high level, and thus enables the systematic microarchitecture design space exploration of the custom accelerators. Index Terms accelerators.

Computer architecture simulator

Application-specific integrated circuit

Speedup

Design space exploration

10.1109/iscas48785.2022.9937422

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Citations (1)

Application of Serial Communication Control in the Motion Control System

Advanced materials research (2011)

Jian Qun Liu Ji Wu Dong Xu Li Xiao Jian Huang

A serial communication protocol according to motion control (MC) system data format has been developed. Based on taking management platform which can be embedded controller or personal computer (PC) as the MC data sending station and motion controller whose core is Digital Signal Processor (DSP) as the MC data receiving station, the detailed situation of how to use the data transfer protocol and the data processing method in MC system is described. Firstly, the organization format of the serial communication data frame is introduced. Then, the relevant saving format of the MC data received by motion controller is described, and the way of how to receive the MC data from serial port is designed. Finally, the whole process of data saving in RAM and data taking out from RAM by motion controller are stated. With the serial communication protocol, a control solution has been provided in the MC system.

Synchronous serial communication

Motion controller

10.4028/www.scientific.net/amr.328-330.1953

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Citations (0)

An intelligent estimation method for product design time

The International Journal of Advanced Manufacturing Technology (2005)

Dong Xu Hong‐Sen Yan

Quality Function Deployment

House of Quality

10.1007/s00170-005-0098-6

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Citations (34)

Highly Crystalline K‐Intercalated Polymeric Carbon Nitride for Visible‐Light Photocatalytic Alkenes and Alkynes Deuterations

Advanced Science (2018)

Chuntian Qiu Yangsen Xu Xin Fan Dong Xu Rika Tandiana

Abstract In addition to the significance of photocatalytic hydrogen evolution, the utilization of the in situ generated H/D (deuterium) active species from water splitting for artificial photosynthesis of high value‐added chemicals is very attractive and promising. Herein, photocatalytic water splitting technology is utilized to generate D‐active species (i.e., D ad ) that can be stabilized on anchored 2nd metal catalyst and are readily for tandem controllable deuterations of carbon–carbon multibonds to produce high value‐added D‐labeled chemicals/pharmaceuticals. A highly crystalline K cations intercalated polymeric carbon nitride (KPCN), rationally designed, and fabricated by a solid‐template induced growth, is served as an ultraefficient photocatalyst, which shows a greater than 18‐fold enhancement in the photocatalytic hydrogen evolution over the bulk PCN. The photocatalytic in situ generated D‐species by superior KPCN are utilized for selective deuteration of a variety of alkenes and alkynes by anchored 2nd catalyst, Pd nanoparticles, to produce the corresponding D‐labeled chemicals and pharmaceuticals with high yields and D‐incorporation. This work highlights the great potential of developing photocatalytic water splitting technology for artificial photosynthesis of value‐added chemicals instead of H 2 evolution.

Carbon nitride

Carbon fibers

Graphitic carbon nitride

Photocatalytic water splitting

10.1002/advs.201801403

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Citations (90)

Defect chemistry in 2D materials for electrocatalysis

Materials Today Energy (2019)

Tao Sun Guoqiang Zhang Dong Xu Xu Lian Hexing Li

MXenes

Nanomaterials

Heteroatom

10.1016/j.mtener.2019.01.004

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Citations (135)

Two-step flash sintering of (Mg_1/3Ta_2/3)_0.01Ti_0.99O₂ giant dielectric ceramics

Microelectronics International (2022)

Zhentao Wang Pai Peng Sujuan Zhong Y. Frank Cheng Dong Xu

Purpose The purpose of this paper on the one hand is to reduce the sintering temperature, shorten the sintering time and improve the electrical properties of the sample through the two-step flash sintering method and on the other hand is to study the effect of electric field on the phase structure, microstructure and electrical properties of the flash sintering sample. Design/methodology/approach In this paper, (Mg 1/3 Ta 2/3 ) 0.01 Ti 0.99 O 2 giant dielectric ceramics were prepared by conventional sintering and two-step flash sintering, respectively. Further, the effect of electric field (600–750 V/cm) on the electrical properties of (Mg 1/3 Ta 2/3 ) 0.01 Ti 0.99 O 2 giant dielectric ceramics was studied. Findings The results show that compared with the conventional sintering, the sintering temperature of the two-step flash sintering can be reduced by 200°C and the sintering time can be shortened by 12 times. All sintered samples were single rutile TiO 2 structure. Compared with conventional sintering, two-step flash sintering samples have finer grain size. The two-step flash sintered sample has similar dielectric properties to the conventional sintered sample. The dielectric constant of flash sintered samples decreases with the increase of electric field. When the electric field is 700 V/cm, the ceramic sample has the optimal dielectric properties, where the dielectric constant is approximately 5.5 × 10 3 and the dielectric loss is about 0.18 at 1 kHz. Impedance spectroscopy analysis shows that the excellent dielectric properties are attributed to the internal barrier layer capacitance model. Originality/value This paper not only provides a new method for the preparation of co-doped TiO 2 giant dielectric ceramics but also has great potential in greatly improving efficiency and saving energy.

Dielectric loss

10.1108/mi-06-2022-0116

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Citations (3)

Crystallization behavior and microstructure of barium borosilicate glass–ceramics

Ceramics International (2015)

Huidong Li Lang Wu Xin Wang Dong Xu Yuancheng Teng

Borosilicate glass

Zirconolite

Differential thermal analysis

Atmospheric temperature range

10.1016/j.ceramint.2015.08.095