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A mechanical reliability study of 3-dB waveguide hybrid couplers in submillimeter and terahertz bands Research Articles
Zhongqian Niu, Bo Zhang, Daotong Li, Dongfeng Ji, Yang Liu, Yinian Feng, Tianchi Zhou, Yaohui Zhang, Yong Fan,zhangbouestc@yeah.net
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 8, Pages 1104-1113 doi: 10.1631/FITEE.2000229
Keywords: 定向耦合器;3-dB分支波导定向耦合器;亚毫米波器件;太赫兹电路;机械可靠性
Robust global route planning for an autonomous underwater vehicle in a stochastic environment Research Article
Jiaxin ZHANG, Meiqin LIU, Senlin ZHANG, Ronghao ZHENG
Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 11, Pages 1658-1672 doi: 10.1631/FITEE.2200026
This paper describes a route planner that enables an to selectively complete part of the predetermined tasks in the operating ocean area when the local path cost is stochastic. The problem is formulated as a variant of the . Based on the (GA), we propose the greedy strategy based GA (GGA) which includes a novel rebirth operator that maps infeasible individuals into the feasible solution space during evolution to improve the efficiency of the optimization, and use a differential evolution planner for providing the deterministic local path cost. The uncertainty of the local path cost comes from unpredictable obstacles, measurement error, and trajectory tracking error. To improve the robustness of the planner in an uncertain environment, a sampling strategy for path evaluation is designed, and the cost of a certain route is obtained by multiple sampling from the probability density functions of local paths. Monte Carlo simulations are used to verify the superiority and effectiveness of the planner. The promising simulation results show that the proposed GGA outperforms its counterparts by 4.7%–24.6% in terms of total profit, and the sampling-based GGA route planner (S-GGARP) improves the average profit by 5.5% compared to the GGA route planner (GGARP).
Keywords: Autonomous underwater vehicle Route planning Genetic algorithm Orienteering problem Stochastic path cost
Electrically tunable liquid crystal coplanar waveguide stepped-impedance resonator Research Articles
Xingye Fan, Ruozhou Li, Jing Yan, Yuming Fang, Ying Yu,jing.yan@njupt.edu.cn,ying_yu_001@163.com
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 9, Pages 1270-1276 doi: 10.1631/FITEE.2000278
Keywords: 可调阶梯阻抗谐振器;液晶;共面波导
Research on Direction and Location for Danger Prediction of Coal or Rock Dynamic Disaster
Xiao Hohgfei,He Xueqiu,Feng Tao,Wang Enyuan
Strategic Study of CAE 2005, Volume 7, Issue 11, Pages 81-86
In order to use the non-touch electromagnetic emission (EME) method to better forecast or predict the danger of coal or rock dynamic disaster such as coal or gas outburst, rock or coal outburst and so on, the direction and location of dangerous areas, that is, how to ascertain the monitoring direction and position for EME, is studied. The research results show that according to the computation for the changing rules of EME signals in various directions by means of the coupling equation between EME and stress, and the EME numerical results comparisons for the designated monitored spot, the best monitoring direction and the direction with most stress or maximum dangers can be ascertained. When dynamically monitoring the EME signals in tunnel head-on in the course of tunnel excavation, the monitoring antenna should be laid at the middle height of tunnel and faced with the coal stratum direction. The outburst danger can be monitored by altering the antenna monitoring direction. The available scope of prediction distance can be determined in light of the stress concentration ascertained by numerical simulation for stress field. The EME measuring results on the spot show that it is feasible to study the direction and location of dangerous areas in predicting the danger of coal or rock dynamic disaster by means of the coupling between EME and stress.
Keywords: rock or coal dynamic disaster danger prediction direction and location deformation and fracture of coal or rock couples between EME and stress electromagnetic emission (EME)
High Sensitive Electron-Bombarded CCD for Low Light Level Imaging
Zhou Liwei,Liu Guangrong,Gao Zhiyun,Wang Zhongchun
Strategic Study of CAE 1999, Volume 1, Issue 3, Pages 56-62
The present paper reviews the recent developments of electron-bombarded charge coupled devices (EBCCD) for low-light-level imaging. The EBCCD eliminates the complicated image transfer chain associated with conventional image intensifier fibrecoupled CCD (ICCD) by integrating a thinned back-illuminated CCD directly into the vacuum of the image tube in replacement of the phosphor screen. The photoelectrons emitted from the photocathode are “proximity focusing” or “sharp focusing” directly onto the electron sensitive CCD, and the video-signal occurs. It has been shown that the EBCCD image tubes offer nearly noiseless gain, high signal to noise ratio and excellent MTF and, for this reason, are superior to conventional ICCD approaches under all light level conditions. This paper will give a detailed description on the thinned back-illuminated CCD imager design and fabrication, such as CCD chip thinning and thinned CCD backside treatment, as well as the technical parameters of different kinds of inverter type EBCCD. The performance of the proximity type EBCCD, the inverter type EBCCD and ICCD will also be compared and analyzed. Finaly, the present paper shows that these new, high performance devices of EBCCD are in an advantageous position for many applications in low-light-lev-el surveillance imaging, high energy physics and medical diagnostics.
Keywords: low-light-level imaging charge-coupled-devices electron-bombarded
Hongchen Chen, Haoshen Zhu, Liang Wu, Wenquan Che, Quan Xue,hongdoublechen@gmail.com,zhuhs@scut.edu.cn,wuliang@cuhk.edu.cn,eewqche@scut.edu.cn,eeqxue@scut.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 4, Pages 586-598 doi: 10.1631/FITEE.2000510
Keywords: CMOS;跨导提升技术;低噪声放大器;变压器;共栅级
Guo Hewei,Jiang Xinbiao,Zhao Zhumin,Chen Lixin,Zhang Xinyi,Zhou Yongmao
Strategic Study of CAE 2012, Volume 14, Issue 8, Pages 64-68
The paper set up the coupled calculation methods of criticality and burnup based on WIMS code and MCNP code, and validated the method. Through the calculation results of cells and the comparison of burnup experiments of Xi’an pulsed reactor, the validity and rationality of the coupled code were proved. The article utilized the coupled code to compute and analyze the burnup of in hospital neutron irradiator mark 1(IHNI-1) reactor at last.
Keywords: IHNI-1 reactor coupled code burnup
Study on the Wavelet Packet Transform Method for Fault Diagnosis of Five Roller Orientation Clutch
Hu Binliang,Luo Yixin,Xie Ming
Strategic Study of CAE 2005, Volume 7, Issue 6, Pages 66-68
The theory and method of wavelet packet decomposition and its energy spectrum dealing with the fault of the overrunning clutch are presented in the paper. The characteristic frequency band of the fault can be identified by wavelet packet decomposition and its energy spectrum conveniently. At the same time, quantification analysis is performed. The result has shown that this method is more advantageous and of practical value than traditional Fourier analysis method.
Keywords: fault diagnosis wavelet packet energy spectrum clutch
Texture branch network for chronic kidney disease screening based on ultrasound images Research Articles
Peng-yi Hao, Zhen-yu Xu, Shu-yuan Tian, Fu-li Wu, Wei Chen, Jian Wu, Xiao-nan Luo,fuliwu@zjut.edu.cn
Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 8, Pages 1119-1266 doi: 10.1631/FITEE.1900210
Keywords: 慢性肾脏病;超声;纹理分支网络;迁移学习
GaAlAs/GaAs Planar Waveguide Filters Based on Cascade Rectangular Resonators
Cai Chun,Liu Xu,Xiao Jinbiao,Ma Changfeng,Chen Lin,Ding Dong,Zhang Mingde,Sun Xiaohan,Xu Xiaole,Chen Tangsheng,Li Fuxiao
Strategic Study of CAE 2004, Volume 6, Issue 2, Pages 61-66
Based on the electromagnetic model for four-port resonant filter, the optical characteristics of several filters with rectangular cascade resonators have been numerically simulated by utilizing two-dimensional FDTD method. The relationship between the number of cascade resonators and the filtering features is analyzed. The narrow-band filter with four cascade resonators implemented on GaAlAs/GaAs planar waveguide is designed and fabricated. The experiment result shows the half-width of filtering spectrum for the chip is about 10 nm, which coincides well with that of the simulation.
Keywords: WDM planar lightwave circuits optical filters resonator FDTD
Correspondence: Monopulse transmitarray antenna fed by aperture-coupled microstrip structure Correspondence
Na KOU, Shixing YU, Zhao DING, Zhengping ZHANG,nkou@gzu.edu.cn,sxyu1@gzu.edu.cn,zding@gzu.edu.cn,zpzhang@gzu.edu.cn
Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 3, Pages 502-510 doi: 10.1631/FITEE.2000547
Keywords: 孔径耦合;单脉冲天线;微带;透射阵列
Compact input-reflectionless balanced bandpass filter with flexible bandwidth using three-line coupled structure Research Article
Yahui ZHU, Jing CAI, Wei QIN, Wenwen YANG, Jianxin CHEN
Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 2, Pages 314-326 doi: 10.1631/FITEE.2200261
Keywords: Input-reflectionless filter Balanced bandpass filter (BPF) Differential mode (DM) Common mode (CM) Three-line coupled structure (TLCS)
A microstrip filter direct-coupled amplifier based on active coupling matrix synthesis Research Articles
Yang Gao, Fan Zhang, Yingying Qiao, Jiawei Zang, Lei Li, Xiaobang Shang,gaoyang678@outlook.com,lilei@zzu.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 9, Pages 1260-1269 doi: 10.1631/FITEE.2000292
Keywords: 放大器;滤波–放大器集成;微带线;耦合矩阵
A case study of oriented perforating technology for the multiple crack fracturing
Tang Meirong
Strategic Study of CAE 2012, Volume 14, Issue 4, Pages 105-112
It has been proved by successful experimental study and application of the new fracturing technology, which create two fracture, significantly improving contact area between fracture and low permeability reservoir, and increasing productivity as well. Normally the permeability of the low permeability block in the Changqing oil field is below 0.5 mD by low-permeable cores analysis. It is a tough task to development the oil through the general methods due to geological condition, watering well distribution and fracturing technology. Volume fracturing is proposed to increase the productivity by multiple crack fracturing since 2006 in Changqing oil field. The fracture initiated from the hole by the perforating shot, then turn the direction of the maximum level principal stress in the physical model research. Two lines of perforating shot are fired in the different depth of the oil reservoir, with an angular between the shots and the maximum level principal stress, liking letter “X”, paralleling in the distance. The oriented perforating technology for the multiple crack fracturing is presented and applied in the Changqing oil field. It is proved that multiple crack created by the downhole microseismic monitoring, productivity also increased 38.1 % compared to the adjacent by oriented perforating and multiple crack fracturing, the characteristics of the reservoir has been analyzed.
Keywords: oriented perforating fractural diverting multiple crack fracturing discharge volume increase in production
Yong Cai, Guang-Wen Chu, Yong Luo, Meng-Jun Su, Bao-Ju Wang, Bao-Chang Sun, Jian-Feng Chen
Engineering 2021, Volume 7, Issue 11, Pages 1603-1610 doi: 10.1016/j.eng.2020.03.020
Keywords: Plasma-assisted rotating disk reactor Pulsed discharge Metronidazole Degradation TiO2
Title Author Date Type Operation
A mechanical reliability study of 3-dB waveguide hybrid couplers in submillimeter and terahertz bands
Zhongqian Niu, Bo Zhang, Daotong Li, Dongfeng Ji, Yang Liu, Yinian Feng, Tianchi Zhou, Yaohui Zhang, Yong Fan,zhangbouestc@yeah.net
Journal Article
Robust global route planning for an autonomous underwater vehicle in a stochastic environment
Jiaxin ZHANG, Meiqin LIU, Senlin ZHANG, Ronghao ZHENG
Journal Article
Electrically tunable liquid crystal coplanar waveguide stepped-impedance resonator
Xingye Fan, Ruozhou Li, Jing Yan, Yuming Fang, Ying Yu,jing.yan@njupt.edu.cn,ying_yu_001@163.com
Journal Article
Research on Direction and Location for Danger Prediction of Coal or Rock Dynamic Disaster
Xiao Hohgfei,He Xueqiu,Feng Tao,Wang Enyuan
Journal Article
High Sensitive Electron-Bombarded CCD for Low Light Level Imaging
Zhou Liwei,Liu Guangrong,Gao Zhiyun,Wang Zhongchun
Journal Article
A 9.8–30.1 GHz CMOS low-noise amplifier with a 3.2-dB noise figure using inductor- and transformer-based
Hongchen Chen, Haoshen Zhu, Liang Wu, Wenquan Che, Quan Xue,hongdoublechen@gmail.com,zhuhs@scut.edu.cn,wuliang@cuhk.edu.cn,eewqche@scut.edu.cn,eeqxue@scut.edu.cn
Journal Article
The burnup calculation for in-hospital neutron irradiator mark 1 reactor based on coupled code of WIMS and MCNP
Guo Hewei,Jiang Xinbiao,Zhao Zhumin,Chen Lixin,Zhang Xinyi,Zhou Yongmao
Journal Article
Study on the Wavelet Packet Transform Method for Fault Diagnosis of Five Roller Orientation Clutch
Hu Binliang,Luo Yixin,Xie Ming
Journal Article
Texture branch network for chronic kidney disease screening based on ultrasound images
Peng-yi Hao, Zhen-yu Xu, Shu-yuan Tian, Fu-li Wu, Wei Chen, Jian Wu, Xiao-nan Luo,fuliwu@zjut.edu.cn
Journal Article
GaAlAs/GaAs Planar Waveguide Filters Based on Cascade Rectangular Resonators
Cai Chun,Liu Xu,Xiao Jinbiao,Ma Changfeng,Chen Lin,Ding Dong,Zhang Mingde,Sun Xiaohan,Xu Xiaole,Chen Tangsheng,Li Fuxiao
Journal Article
Correspondence: Monopulse transmitarray antenna fed by aperture-coupled microstrip structure
Na KOU, Shixing YU, Zhao DING, Zhengping ZHANG,nkou@gzu.edu.cn,sxyu1@gzu.edu.cn,zding@gzu.edu.cn,zpzhang@gzu.edu.cn
Journal Article
Compact input-reflectionless balanced bandpass filter with flexible bandwidth using three-line coupled structure
Yahui ZHU, Jing CAI, Wei QIN, Wenwen YANG, Jianxin CHEN
Journal Article
A microstrip filter direct-coupled amplifier based on active coupling matrix synthesis
Yang Gao, Fan Zhang, Yingying Qiao, Jiawei Zang, Lei Li, Xiaobang Shang,gaoyang678@outlook.com,lilei@zzu.edu.cn
Journal Article
A case study of oriented perforating technology for the multiple crack fracturing
Tang Meirong
Journal Article