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<title cf:type="text"><![CDATA[Editorial department of the Journal of National University of Defense Technology -->专栏：太赫兹技术与应用前沿进展]]></title>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Review of dynamic characterization research of high power IGBTs and their combinations under multiple time scales]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202106014]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Based on demand of multiple time scale dynamic characterization of power electronic devices and their combination, the recent research progress and achievements on the widely used full-control power electronic devices—IGBTs(insulated gate bipolar transistors), were analyzed systematically, including the multiple time scales electro-thermal modeling of high power IGBTs and their combinations, quantitative failure evaluation methods based on the multiple time scales model and the assisted multi-rate simulation method. Furthermore, applications of the models were introduced in power electronic instruments design. In conclusion, the dynamic characterization method of high power IGBTs and their combinations under multiple time scales were presented from four aspects of modelling method, reliability evaluation, simulation method and application design, which can bring theoretical and technical support of power electronic devices to precise design of power electronic hybrid system.]]></description>
<pubDate>2021/12/4 0:00:00</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[XIAO Fei, MA Weiming, LUO Yifei, LIU Binli, JIA Yingjie, LI Xin]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>XIAO Fei, MA Weiming, LUO Yifei, LIU Binli, JIA Yingjie, LI Xin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202106014]]></guid><cfi:id>16</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Theoretical analysis and experimental verification of nonlinear vibrational response of cracked blade]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202106015]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Blade cracks pose a serious threat to aviation safety and lead to serious aviation accidents. In order to diagnose cracks at the early stage, the nonlinear vibration of cracked blades was investigated theoretically and experimentally. A nonlinear dynamic model was established to link the crack size and the dynamic parameters. A coupling quantification expression of the coupling component power in the nonlinear vibration response was obtained. This response expression indicated that the harmonic element power was determined by the adjacent component power, component order, and positively correlated with the depth of the blade crack. Therefore, based on the relative power of the vibrational components, a crack detection method is proposed. Results of the simulation and the testbed experiment both show that the cracked blades are effectively separated from the normal blades by this method.]]></description>
<pubDate>2021/12/4 21:09:57</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[SHEN Guoji, GUAN Fengjiao, BIAN Zifang, HU Haifeng, YANG Yongmin]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>SHEN Guoji, GUAN Fengjiao, BIAN Zifang, HU Haifeng, YANG Yongmin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202106015]]></guid><cfi:id>15</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Analysis of polarization characteristics of reflected lights on smooth object surface and separation of reflected lights]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202106016]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Reflected lights on object surfaces are composed of specular and diffuse reflection lights. To separate the specular and diffuse reflection lights on a smooth object surface, a polarization state characterization model based on the collaborative effect of specular and diffuse reflections was proposed and was used to analyze the polarization characteristics in a mixed reflection region. Based on their polarization characteristics and their distribution relations perpendicular and parallel to the smooth object surface, the specular and diffuse reflection lights were separated by polarization orthogonal decomposition. According to the correlation features between the specular and diffuse reflection components, the normalized correlation minimum between the specular and diffuse reflection lights and its corresponding to the degrees of specular and diffuse reflection polarization were calculated by the gradient descent algorithm, thus enabling the successful separation of the reflected lights. By testing reflected light images obtained from different scenes, the results indicate that the proposed algorithm could effectively separate reflection lights.]]></description>
<pubDate>2021/12/4 21:09:57</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[ZHANG Yan, ZHANG Jinghua, SHI Zhiguang, ZHANG Yu, LING Feng, LIU Di, SUO Yuchang, SHI Xiaoran]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Yan, ZHANG Jinghua, SHI Zhiguang, ZHANG Yu, LING Feng, LIU Di, SUO Yuchang, SHI Xiaoran</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202106016]]></guid><cfi:id>14</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Design and performance evaluation of gravitational potential energy locking exoskeleton]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202106017]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The existing passive exoskeletons have some defects, including the lack of assistance effect. Based on the gait characteristics of human body, the principle of transforming gravitational potential energy during walking process into kinetic energy during lifting leg process was proposed, in which a passive lower extremity mechanical exoskeleton was designed by the combination of spring, crank slider mechanism, ratchet pawl mechanism and chain drive mechanism, and the performance of exoskeleton was evaluated by kinetic analysis and physiological cost index experiment. Results of kinetic analysis show that the total peak torque of hip joint is reduced by 23.38% and the total work of hip joint is reduced by 30.59% after wearing the exoskeleton, which preliminarily verifies the effectiveness of the exoskeleton. The results of experiment show no significant effect in short distance action conversion, but is reduced by 8.1% and 10.4% in long distance walking and uphill walking, respectively. Therefore, the assisting performance of the passive exoskeleton has been verified, which provides an instance reference for research in related fields.]]></description>
<pubDate>2021/12/4 0:00:00</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[CAO Enguo, GAO Yang, WANG Gang, HU Weifeng, CAO Yi]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CAO Enguo, GAO Yang, WANG Gang, HU Weifeng, CAO Yi</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202106017]]></guid><cfi:id>13</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Multi-agent model of epidemic control process for large cruise ships]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202106018]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Based on the theory of complex network and propagation dynamics, a social network was constructed, which conforms to the interaction characteristics of large cruise ships. The hierarchical structure of the communication network was defined, five rules of topology generation of the interaction network were analyzed, and the social networks construction method of the large cruise ships epidemic communication were given. Based on the multi-agent technology, the properties of the members of the interaction network nodes and the epidemic propagation characteristics were studied, the basic form of agent member state-space was given, the physical characteristics of protection and treatment, management and control isolation, information interaction and other factors were integrated, the algorithm of agent state transfer and behavior interaction process were constructed, and the structure and interval characteristics of attenuation function were analyzed and demonstrated. Compared with the constant-distance model and the random-walk model, the simulation calculations of the epidemic transmission process of typical large cruise ships were carried out under 4 working conditions and 12 states, respectively. Results show that the random-walk model is more suitable for the simulation of the early epidemic transmission process of large cruise ships and the analysis of epidemic prevention and control strategies with abundant information.]]></description>
<pubDate>2021/12/4 0:00:00</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[REN Kai, LI Ying, LUO Wenjun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>REN Kai, LI Ying, LUO Wenjun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202106018]]></guid><cfi:id>12</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Azimuth angle estimation technology of subsonic flight vehicle]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202106019]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The aerodynamic noise of subsonic flight trajectory is wideband non-stationary noise. A new direction of arrival estimation algorithm based on wavelet function was proposed. The time-frequency analysis method was used to obtain the significant characteristics of the aerodynamic noise. By optimizing the characteristics of space-time spectrum, the target signal in time-frequency domain was optimized to enhance the significance of the target signal in space spectrum, effectively realizing the azimuth angle estimation of the aerodynamic noise of the subsonic flight vehicle finally. The experimental data shows that array signal processing model based on time-frequency analysis can better achieve the azimuth angle estimation of aerodynamic noise of subsonic flight vehicle.]]></description>
<pubDate>2021/12/4 21:09:57</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[WANG Lei, CHEN Zhaonan, ZHANG Jun, ZHOU Wei, TONG Jianfei]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WANG Lei, CHEN Zhaonan, ZHANG Jun, ZHOU Wei, TONG Jianfei</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202106019]]></guid><cfi:id>11</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Response characteristics of laser-irradiated 45# steel plate]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202106020]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A combination of experiment and numerical simulation was used to study the response characteristics of laser-irradiated 45# steel plate. Based on the continuous fiber laser emission system, the laser irradiation experiment of the steel plate was carried out and the temperature field distribution and the ablation and perforation characteristics of the target plate were obtained. A finite element model of the metal target plate was established on the basis of ANSYS to simulate the thermal response process of the target plate under laser irradiation. The influence rules of the target plate thickness, laser power and spot diameter on temperature distribution and perforation characteristics of the target plate were obtained.]]></description>
<pubDate>2021/12/4 21:09:57</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[WANG Qingtao, QIAN Qiudong, LI Xiao, WANG Chongxu]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WANG Qingtao, QIAN Qiudong, LI Xiao, WANG Chongxu</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202106020]]></guid><cfi:id>10</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Fast Fourier transform-based scanning single-input-single-output array near-field imaging technology]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201001]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In recent years, the scanning SISO(single-input-single-output) array near-field imaging technology has attracted widespread attention in civilian fields, such as security inspection and medical treatment. However, during the echo processing of traditional range migration algorithm, the multi-step approximation and interpolation operation cannot be avoided, and the adverse effect caused by signal propagation attenuation is ignored. Therefore, this research proposed a FFT (fast Fourier transform)-based scanning SISO array near-field imaging technology in which the amplitude attenuation factor in the echo model was preserved. The convolution operation on azimuth and altitude dimensions was performed according to the characteristics of the target echo equation. The target image could be obtained by applying FFT and coherent accumulation steps. Simulation analysis and experimental results show that the proposed method can not only improve the target image quality while ensuring the efficiency of image reconstruction, but also effectively reduce the impact of signal spatial propagation loss on the imaging quality.]]></description>
<pubDate>2022/1/19 9:20:43</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[CHEN Xu, YANG Qi, DENG Bin, ZENG Yang, WANG Hongqiang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHEN Xu, YANG Qi, DENG Bin, ZENG Yang, WANG Hongqiang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201001]]></guid><cfi:id>9</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Millimeter wave three-dimensional imaging algorithm of nonuniform planar array for nondestructive testing]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201002]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Millimeter wave has great potential in the field of nondestructive testing due to its unique advantages of high resolution, high penetration and low photon energy. For the application of millimeter wave nondestructive testing, a three-dimensional imaging algorithm for nonuniform planar array was proposed by combining the idea of the range migration algorithm and the nonuniform fast Fourier transform. The proposed algorithm uses nonuniform fast Fourier transform to reconstruct the signal spectrum in wavenumber domain, which overcomes the limitation of nonuniform spatial sampling on traditional imaging algorithms based on Fourier transform. The proposed algorithm is aimed to eliminate the complicated interpolation operation and improve the imaging efficiency. In order to verify the effectiveness of the proposed algorithm, the back projection algorithm was used as a comparison, the simulation and experiment was carried out, respectively. Simulation and experimental results all show that the proposed algorithm can achieve high-efficiency imaging of dielectric targets with high imaging accuracy and fast speed.]]></description>
<pubDate>2022/1/19 9:20:43</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[MA Zhaoyang, DENG Guilin, ZENG Yang, DENG Bin, YANG Qi, WANG Hongqiang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>MA Zhaoyang, DENG Guilin, ZENG Yang, DENG Bin, YANG Qi, WANG Hongqiang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201002]]></guid><cfi:id>8</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Enhanced terahertz coded aperture imaging using convolutional neural networks]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201003]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[To address the problems of poor robustness and high computational complexity of some existing coded aperture imaging algorithms, an enhanced terahertz coded aperture imaging method based on convolutional neural networks was proposed in this paper. The method realized implicit modeling of the imaging system by constructing an end-to-end neural network that exploited the network′s strong inversion ability and noise immunity for target reconstruction at low SNRs (signal-to-noise ratios). The simulation experiments show that the proposed method can achieve the reconstruction of targets with different sparseness at different SNRs. Moreover, the proposed method can achieve a higher resolution reconstruction of the target at low SNRs in comparison with to the classical optimization iterative algorithm.]]></description>
<pubDate>2022/1/19 0:00:00</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[GAN Fengjiao, LUO Chenggao, PENG Long, LIANG Chuanying, WANG Hongqiang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>GAN Fengjiao, LUO Chenggao, PENG Long, LIANG Chuanying, WANG Hongqiang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201003]]></guid><cfi:id>7</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Metasurface antenna with cross-spectrum and low-observable performance]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201004]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Aiming at the new requirements of antenna for low-observable aircraft platform, metasurface antenna with microwave and infrared cross-spectrum and low-observable performance was proposed and designed. To enable the antenna to possess normal radiation properties and absorbing characteristics simultaneously, a novel idea that metasurface design thought integrated into the antenna design was proposed. In this way, radar cross section of the antenna can be reduced without additional loading of the absorbing metasurface, and only by using absorbing characteristics of the antenna structure. On this basis, to realize infrared low-observable of the antenna, metasurface with microwave transparent characteristics and low emissivity characteristics in the infrared band was designed, and it was loaded above the antenna to reduce antenna emissivity. Experimental results show that the novel designed metasurface antenna operates from 2.72 GHz to 2.82 GHz and the maximum gain reaches 6.72 dBi, which indicates the antenna possesses good radiation properties. The reflection magnitudes of the electromagnetic metasurface antenna are all less than -10 dB from 2.70 GHz to 2.80 GHz. The minimum reflection magnitude is -12.49 dB. The emissivity of the antenna is 0.212 by loading the metasurface, which is 0.334 (61.2%) lower than the antenna without metasurface. From the above results, it can be concluded that the novel designed antenna achieves low-observability of both microwave and infrared simultaneously while maintaining normal radiation properties. The novel metasurface antenna provides a novel approach for antenna design of low-observable aircraft platforms.]]></description>
<pubDate>2022/1/19 9:20:43</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[ZHENG Yuejun, CHEN Qiang, DING Liang, XIAO Ke, ZHONG Yun, ZHANG Guisheng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHENG Yuejun, CHEN Qiang, DING Liang, XIAO Ke, ZHONG Yun, ZHANG Guisheng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201004]]></guid><cfi:id>6</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Multi-voice signal activities detection method based on terahertz radar]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201005]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Aiming at the problem the traditional voice acquisition method is difficult to correctly detect the voice activity at the desired voice source when multiple voice sources exist simultaneously, a multi-voice activities detection method based on terahertz radar was proposed. The short wave length of terahertz radar was utilized to improve the detection sensitivity for micro vibration. At the same time, the high range resolution brought by large broadband was used to distinguish different voice sources. After obtaining the voice signal, the signal quality was further improved for signal activities detection by spectral subtraction wavelet joint denoising method. The experimental results show that, when there are interfering voice source on the transmission path, the proposed method can more effectively distinguish multiple voice sources and obtain the voice activity at the desired voice source than the microphone-based method.]]></description>
<pubDate>2022/1/19 9:20:43</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[WANG Yuanhao, WANG Hongqiang, YANG Qi, DENG Bin, LUO Chenggao]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WANG Yuanhao, WANG Hongqiang, YANG Qi, DENG Bin, LUO Chenggao</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201005]]></guid><cfi:id>5</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[220 GHz transceiver front end for detection]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201006]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Based on the strong nonlinear characteristics of terahertz schottky diode, a compact 220 GHz transceiver front-end for continuous wave frequency modulation radar detection was developed by using multiple harmonic frequency doubling and mixing method. In order to realize the transmitter with high power output, the power amplifier driver of 220 GHz frequency multiplier adopted 4-way power synthesis method to realize 70 GHz 300 mW high-power power amplifier module, and 70 GHz high suppression 7th order cavity bandpass filter to suppress high-order harmonic signal. In order to achieve a high sensitivity receiver, the 220 GHz harmonic mixer adopted hammer-head suppression structure and diode precise noise model to design the circuit structure, and the IF link adopted switch control to achieve dynamic gain control with dynamic range greater than 60 dB. The 220 GHz transceiver front-end achieves a maximum power output of more than 10 mW in the range of 215~225 GHz. The minimum noise figure of the receiver is less than 7 dB, and the gain dynamic range is greater than 60 dB (-7~54 dB).]]></description>
<pubDate>2022/1/19 9:20:43</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[HE Yue, TIAN Yaoling, LIU Ge, HUANG Kun, DENG Xianjin, SU Wei]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>HE Yue, TIAN Yaoling, LIU Ge, HUANG Kun, DENG Xianjin, SU Wei</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201006]]></guid><cfi:id>4</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[High-performance room temperature terahertz photodetectors prepared by new micro-nano materials]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201007]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The realization of high sensitivity terahertz detector which can be operated at room temperature poses difficulty in this field. The terahertz detector based on the principle of thermoelectricity provides the posibility for wide detection frequency range and high sensitivity detection at room temperature. By utilizing the high carrier mobility and excellent thermoelectric properties of new micro-nano materials such as graphene and perovskite, the high-performance terahertz photodetectors operating at room temperature were prepared, the detection of the photoelectric response can be up to 271 mA/W, and the response time is less than 20 ms. Results show that photothermoelectric detectors prepared by graphene and perovskite are expected to be a new generation of high performance detectors in terahertz frequency band.]]></description>
<pubDate>2022/1/19 9:20:43</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[ZHANG Yating, ZHANG Haijian, LI Yifan, LI Mengyao, TANG Xin, YAO Jianquan]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Yating, ZHANG Haijian, LI Yifan, LI Mengyao, TANG Xin, YAO Jianquan</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201007]]></guid><cfi:id>3</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Estimation of specular radar cross section for metal object with rough surfaces in terahertz band]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201008]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Research on the modulation of the surface roughness to the RCS (radar cross section) has vital importance to the RCS scaled measurement for rough metal targets in the terahertz band. The changing laws of specular RCS of rough metal target with different surface roughness were studied. Based on the method of Kirchhoff approximation, combined with the theory of coherent and incoherent scattering, the method for predicting the specular RCS of rough metal target was proposed under the condition of small surface roughness. The effectiveness of the prediction method was validated by simulation experiments. The proposed method can achieve fast estimation of specular RCS for metal target with small surface roughness in the low terahertz band, and further predict the specular RCS for the scaled model with rough surface. This method also can provide effective RCS value for the comparison with the measurement result, which theoretically supports the study of RCS scaled measurements for rough targets in the terahertz spectrum.]]></description>
<pubDate>2022/1/19 9:20:43</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[PANG Shuang, ZENG Yang, YANG Qi, DENG Bin, WANG Hongqiang]]></author>
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<atom:name>PANG Shuang, ZENG Yang, YANG Qi, DENG Bin, WANG Hongqiang</atom:name>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Terahertz wave propagation characteristics in the plasma sheath of near space vehicle]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202201009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Plasma sheath formed during the reentry of near space hypersonic vehicle will interfere the electromagnetic wave detection. In order to solve this problem, the model of the typical near space vehicle was built, and the flow field distribution under different flight conditions during the reentry process was simulated. Based on the flow field distribution, the plasma parameter distribution was modeled, and the transmission characteristics of terahertz wave in the plasma sheath were theoretically calculated by using the scattering matrix method. The results show that high frequency terahertz wave can penetrate plasma sheath effectively. In addition, terahertz active imaging experiments were carried out in the laboratory environment. The experimental results show that the plasma exerts little effect on the terahertz active imaging results. The simulation and experimental results preliminarily prove the potential of terahertz technology for hypersonic vehicle detection, which is of great significance for national defense.]]></description>
<pubDate>2022/1/19 9:20:44</pubDate>
<category><![CDATA[专栏：太赫兹技术与应用前沿进展]]></category>
<author><![CDATA[CHEN Kai, XU Degang, LI Jining, ZHONG Kai, YAO Jianquan]]></author>
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<atom:name>CHEN Kai, XU Degang, LI Jining, ZHONG Kai, YAO Jianquan</atom:name>
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