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Band-gap tunable (GaxIn1−x)2O3 layer grown by magnetron sputtering Research Articles

Fabi Zhang, Jinyu Sun, Haiou Li, Juan Zhou, Rong Wang, Tangyou Sun, Tao Fu, Gongli Xiao, Qi Li, Xingpeng Liu, Xiuyun Zhang, Daoyou Guo, Xianghu Wang, Zujun Qin,zhangfabi@outlook.com,qinzj@guet.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 10,   Pages 1370-1378 doi: 10.1631/FITEE.2000330

Abstract: Multicomponent oxide (GaIn)O films are prepared on (0001) sapphire substrates to realize a tunable band-gap by technology followed by thermal annealing. The optical properties and band structure evolution over the whole range of compositions in ternary compounds (GaIn)O are investigated in detail. The X-ray diffraction spectra clearly indicate that (GaIn)O films with Ga content varying from 0.11 to 0.55 have both cubic and monoclinic structures, and that for films with Ga content higher than 0.74, only the monoclinic structure appears. The transmittance of all films is greater than 86% in the visible range with sharp absorption edges and clear fringes. In addition, a blue shift of ultraviolet absorption edges from 380 to 250 nm is noted with increasing Ga content, indicating increasing band-gap energy from 3.61 to 4.64 eV. The experimental results lay a foundation for the application of transparent conductive compound (GaIn)O thin films in photoelectric and photovoltaic industry, especially in display, light-emitting diode, and solar cell applications.

Keywords： (GaxIn1−x)2O3薄膜；带隙可调谐；磁控溅射    

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Sb2Te3 topological insulator for 52 nm wideband tunable Yb-doped passively Q-switched fiber laser Research

Tao Wang, Qiang Yu, Kun Guo, Xinyao Shi, Xuefen Kan, Yijun Xu, Jian Wu, Kai Zhang, Pu Zhou,wujian15203@163.com,kzhang2015@sinano.ac.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 3,   Pages 287-436 doi: 10.1631/FITEE.2000577

Abstract: has the advantage of broadband saturable absorption from the visible to the infrared bands. Herein, the two-dimensional material saturable absorber (SA) of the family was first applied experimentally in a wideband tunable passively Q-switched Yb-doped fiber laser. High-quality crystals were synthesized by the flux zone method. The SA with fewer layers was further prepared via a modified mechanical exfoliation procedure. Meanwhile, stable wavelength-tunable passive Q-switching pulse operation was obtained in a Yb-doped fiber ring cavity based on the SA, where the central wavelength can be continuously tuned from 1040.89 to 1092.85 nm. Results suggest that has wideband saturable absorption properties, and that the tunable pulse laser can provide a convenient and simple source for practical applications.

Keywords： 拓扑绝缘体；Sb2Te3；光纤激光；被动调Q激光；波长可调谐激光    

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A Thermo-Tunable Metamaterial as an Actively Controlled Broadband Absorber Article

Xiao-Chang Xing, Yang Cao, Xiao-Yong Tian, Lingling Wu

Engineering 2023, Volume 20, Issue 1,   Pages 143-152 doi: 10.1016/j.eng.2022.04.028

Abstract:

Metamaterials have attracted increasing attention in recent years due to their powerful abilities in manipulating electromagnetic (EM) waves. However, most previously reported metamaterials are unable to actively control full-band EM waves. In this paper, we propose a thermo-tunable broadband metamaterial (T-TBM) using paraffin-based composites (PD-Cs) with different phase transition temperatures. Active control of the T-TBM reflection loss peaks from low to high frequency is realized by manipulating the solid–liquid state of the PD-Cs at different phase transition temperatures. The absorption peak bandwidth (where the reflection loss value is less than −30 dB) can be changed, while the broad bandwidth absorption (where the reflection loss value is less than −10 dB) is satisfied by adjusting the temperature of the T-TBM. It is shown that the stagnation of the phase transition temperature of the PD-Cs in the T-TBM provides a time window for actively controlling the EM wave absorption response under different thermal conditions. The device has a broad application prospect in the fields of EM absorption, intelligent metamaterials, multifunctional structural devices, and more.

Keywords： Metamaterials     Active control     Thermally tunable     Broadband absorption    

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Analysis and Study of New Type Hydrostatic Bearing Restrictor With Very Good Restrictive Performance

Meng Xinzhai,Meng Zhaoyan

Strategic Study of CAE 2005, Volume 7, Issue 3,   Pages 49-52

Abstract:

The new type restrictor of hydrostatic bearing has many good and useful restrictive performances： ①According to the analysis in this paper, the restrictive parameter index must be preserved b≥3.② When extra load forced on the bearing fluid pocket, the pocket pressure is increased by the additional load at once. At this time, the pocket pressure is applied to the end area of valve also. Therefore, the valve will be changed along axis by the increased fluid pressure. The incremental value of restrictive parameter will be increased at the same time. As a result, the new type restrictor will be supplied with more fluid flow. The bearing clearance may maintain nearly constant. ③There are three new types of restrictors： new type variable clearance slide valve, new type clearance sheat and new type variable diameter capillary. It has advantages, such as simple construction, low cost and smaller volume.

Keywords： variable clearance sliding valve     variable clearance sheet     variable diameter capillary     index of restrictive parameter    

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Tantalum (Oxy)Nitride: Narrow Bandgap Photocatalysts for Solar Hydrogen Generation Review

Mu Xiao, Songcan Wang, Supphasin Thaweesak, Bin Luo, Lianzhou Wang

Engineering 2017, Volume 3, Issue 3,   Pages 365-378 doi: 10.1016/J.ENG.2017.03.019

Abstract:

Photocatalytic water splitting, which directly converts solar energy into hydrogen, is one of the most desirable solar-energy-conversion approaches. The ultimate target of photocatalysis is to explore efficient and stable photocatalysts for solar water splitting. Tantalum (oxy)nitride-based materials are a class of the most promising photocatalysts for solar water splitting because of their narrow bandgaps and sufficient band energy potentials for water splitting. Tantalum (oxy)nitride-based photocatalysts have experienced intensive exploration, and encouraging progress has been achieved over the past years. However, the solar-to-hydrogen (STH) conversion efficiency is still very far from its theoretical value. The question of how to better design these materials in order to further improve their water-splitting capability is of interest and importance. This review summarizes the development of tantalum (oxy)nitride-based photocatalysts for solar water spitting. Special interest is paid to important strategies for improving photocatalytic water-splitting efficiency. This paper also proposes future trends to explore in the research area of tantalum-based narrow bandgap photocatalysts for solar water splitting.

Keywords： Tantalum-based photocatalyst     Narrow bandgap     Water splitting     Hydrogen    

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Analysis on the Characteristics of Metal Belt Drive With Magnet

Luo Shanming,Guo Yingfu,Chen Anhua,Yu Yidao,Chen Lifeng

Strategic Study of CAE 2005, Volume 7, Issue 7,   Pages 76-80

Abstract:

The characteristics of metal belt drive with magnet (MBDM) are introduced in this paper. The transmission characteristics are also analyzed and discussed, such as effective tension, linear velocity and elastic sliding ratio. Finally, some performance parameters involved are determined by experiment. The results show that the friction force between pulley and metal belt can be increased by a great extent because of the coupling action of magnetic attraction and initial tension. The transmission efficiency of MBDM can reach from 95 % to 98 % , but the elastic sliding ratio is usually not more than 0.1%.

Keywords： belt drive     metal belt     magnetic attraction     electromechanical coupling    

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Towards adaptable and tunable cloud-based map-matching strategy for GPS trajectories Article

Aftab Ahmed CHANDIO,Nikos TZIRITAS,Fan ZHANG,Ling YIN,Cheng-Zhong XU

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 12,   Pages 1305-1319 doi: 10.1631/FITEE.1600027

Abstract: Smart cities have given a significant impetus to manage traffic and use transport networks in an intelligent way. For the above reason, intelligent transportation systems (ITSs) and location-based services (LBSs) have become an interesting research area over the last years. Due to the rapid increase of data volume within the transportation domain, cloud environment is of paramount importance for storing, accessing, handling, and processing such huge amounts of data. A large part of data within the transportation domain is produced in the form of Global Positioning System (GPS) data. Such a kind of data is usually infrequent and noisy and achieving the quality of real-time transport applications based on GPS is a difficult task. The map-matching process, which is responsible for the accurate alignment of observed GPS positions onto a road network, plays a pivotal role in many ITS applications. Regarding accuracy, the performance of a map-matching strategy is based on the shortest path between two con-secutive observed GPS positions. On the other extreme, processing shortest path queries (SPQs) incurs high computational cost. Current map-matching techniques are approached with a fixed number of parameters, i.e., the number of candidate points (NCP) and error circle radius (ECR), which may lead to uncertainty when identifying road segments and either low-accurate results or a large number of SPQs. Moreover, due to the sampling error, GPS data with a high-sampling period (i.e., less than 10 s) typically contains extraneous datum, which also incurs an extra number of SPQs. Due to the high computation cost incurred by SPQs, current map-matching strategies are not suitable for real-time processing. In this paper, we propose real-time map-matching (called RT-MM), which is a fully adaptive map-matching strategy based on cloud to address the key challenge of SPQs in a map-matching process for real-time GPS trajectories. The evaluation of our approach against state-of-the-art approaches is per-formed through simulations based on both synthetic and real-world datasets.

Keywords： Map-matching     GPS trajectories     Tuning-based     Cloud computing     Bulk synchronous parallel    

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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

Abstract: A tunable stepped-impedance resonator using is demonstrated. Two resonant frequencies at 3.367 and 7.198 GHz are realized and can be continuously tuned by external applied voltages. Continuous tunable ranges of 52 and 210 MHz have been achieved at a particularly low driving voltage of 14 V, which shows good agreement with the simulation results. The voltage-induced hysteresis phenomenon is also investigated. This device also has a low insertion loss of −2.9 and −4 dB for the two resonant frequencies and the return losses are less than −21.5 dB. This work provides a new protocol to realize a tunable frequency for communication systems.

Keywords： 可调阶梯阻抗谐振器；液晶；共面波导    

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Dam Concrete Placement by Towerbelt

Peng Gang

Strategic Study of CAE 2004, Volume 6, Issue 9,   Pages 77-80

Abstract:

The outstanding properties of concrete placement by towerbelt are the interrupted feeding, high intensity and the capability of direct pouring on the block. However, there would be some problems of back rise of temperature of the pre-cooled concrete during transportation, which is prone to segregation of concrete aggregate if not suitably controlled. Therefore, how to guarantee the concrete placement by towerbelt both at high speed and of good quality is the key issue to be solved during the construction. Some key issues are discussed in the paper at combination with the phase Ⅱ concrete construction of the TGP powerhouse and dam in terms of quality control of raw materials of concrete, counterpart equipment and construction technologies on the pouring block, designs matching and equipment management during the dam concrete placement by towerbelts.

Keywords： TGP     towerbelfs     pouring concrete    

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Analysis of Influencing Factors on Transmission Ratio in Magnetic Metal Belt Transmission

Luo Shanming,Miao Xiexing

Strategic Study of CAE 2002, Volume 4, Issue 3,   Pages 73-77

Abstract:

Magnetic metal belt transmission is a new one in which the initial tension no longer solely, but together with the magnetic attraction force produces the friction force. The influencing factors on transmission ratio are analyzed and numerically simulated in this paper, such as effective haulage force, initial tension, magnetic induction intensity, center distance, diameter of the smaller belt pulley and angle of contact. The change laws of transmission ratio along with these influencing factors are studied. The results show that the transmission ratio of magnetic metal belt transmission increases when magnetic induction density, initial tension and center distance increases, and decrease when angle of contact and diameter of the smaller belt pulley increases. It is pointed out that the angle of contact and diameter of the smaller belt pulley can be reduced accordingly because of the effect of magnetic force, and therefore the transmission ratio can increase by 3〜4 times compared with general belt transmission.

Keywords： belt transmission     magnetism     metal belt     transmission ratio    

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Principle of Laser Nano-meter Measurement Ruler

Zhang Shulian

Strategic Study of CAE 2005, Volume 7, Issue 3,   Pages 27-34

Abstract:

In the past applications saw laser as light source only, did not involve in internal structure and physical phenomena of lasers. The efforts had been done to transform single HeNe laser into a sensor, but ceased before great breakthrough. This paper reports the progress in investigating Laser Nano-meter Measurement Ruler, which is just the laser itself. The principle is based on the frequency splitting, mode competition, cavity tuning, etc., of laser, which are done or found by the author and colleagues. The configuration is that employing an inter — cavity birefringence element to split a laser frequency into two frequencies, ⊥light and // light; alternately occurring of strong and medium mode competition as the cavity being tuned, dividing the lasing bandwidth to three equivalent parts; again making the laser longitudinal separation being 4/3 of lasing bandwidth. The consequence is that 丄 light suppressing // light dying out in the first A /8 of mirror displacement, ⊥light and //light oscillating together in the second λ/8, //light suppressing ⊥light dying out in the third λ/8, ⊥light and //light dying out together in the fourth λ/8; with one time of repetition of the four regions the displacement of the mirror is λ /2. Calculating the number of polarization regions the displacement is known. The direction of displacement can be judged by the difference of polarization of each region. The cavity mirror of movement is joined with the object to be measured by a guide. The measurement range： 12 mm, resolution： 79.08 nm, linearity： 5×l0-6, 2σ = 0.314 μm. This achievement is significant for both fields of lasers and metrology.

Keywords： displacement measurement     HeNe laser     mode competition     frequency splitting     cavity tuning     longitudinal mode     birefringence    

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The Latest Development of Optical Fiber, Optical Fiber Band and Optical Cable Technology Abroad

Liu Liangyan

Strategic Study of CAE 2001, Volume 3, Issue 9,   Pages 86-94

Abstract:

In this paper, new development about the study of dispersion-compensable low transmission loss optical fiber, nonzero dispersion displacement optical fiber, and carbon-coated or silicon nitride-coated optical fiber (applied in bad environment) was comprehensively introduced. Then the manufacture technology of band optical fiber including its structure, coatings, properties and manufacture process was reviewed. Multi-core optical fiber band cable manufacture technology such as twisted loose-tube, center loose-tube, frame, dry core band optical cable was also discussed.

Keywords： optical communication     low transmission loss optical fiber     optical fiber band     band optical fiber cable    

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Transparent Thermally Tunable Microwave Absorber Prototype Based on Patterned VO2 Film Article

Zhengang Lu, Yilei Zhang, Heyan Wang, Chao Xia, Yunfei Liu, Shuliang Dou, Yao Li, Jiubin Tan

Engineering 2023, Volume 29, Issue 10,   Pages 198-206 doi: 10.1016/j.eng.2022.10.005

Abstract:

Transparent microwave absorbers that exhibit high optical transmittance and microwave absorption capability are ideal, although having a fixed absorption performance limits their applicability. Here, a simple, transparent, and thermally tunable microwave absorber is proposed, based on a patterned vanadium dioxide (VO2) film. Numerical calculations and experiments demonstrate that the proposed VO2 absorber has a high optical transmittance of 84.9% at 620 nm; its reflection loss at 15.06 GHz can be thermally tuned from –4.257 to –60.179 dB, and near-unity absorption is achieved at 523.75 K. Adjusting only the patterned VO2 film duty cycle can change the temperature of near-unity absorption. Our VO2 absorber has a simple composition, a high optical transmittance, a thermally tunable microwave absorption performance, a large modulation depth, and an adjustable temperature tuning range, making it promising for application in tunable sensors, thermal emitters, modulators, thermal imaging, bolometers, and photovoltaic devices.

Keywords： Tunable microwave absorber     VO2 film     Optical transparent     Near unity absorption     Large modulation depth    

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Novel Radiation-Adjustable Heating Terminal Based on Flat Heat Pipe Combined with Air Source Heat Pump Article

Yifan Wu,Hongli Sun,Mengfan Duan,Borong Lin,Hengxin Zhao,Chaohung Liu

Engineering 2023, Volume 20, Issue 1,   Pages 192-207 doi: 10.1016/j.eng.2021.09.019

Abstract:

The electrification of building heating is an effective way to meet the global carbon target. As a clean and sustainable electrified heating technology, air-source heat pumps (ASHPs) are widely used in areas lacking central heating. However, as a major component of space heating, heating terminals might not fit well with ASHP in order to achieve both intermittency and comfort. Therefore, this study proposes a novel radiation-adjustable heating terminal combined with an ASHP to achieve electrification, intermittency, and better thermal comfort. Radiant terminals currently suffer from three major problems: limited maximum heating capacity, inability to freely adapt, and difficulty with combining them with ASHPs. These problems were solved by improving the structural design of the novel terminal (Improvement A–E). Results showed that the maximum heating capacity increased by 23.6% and radiation heat transfer ratio from 10.1% to 30.9% was provided for users with the novel terminal. Further, new flat heat pipe (FHP) design improved stability (compressor oil return), intermittency (refrigerant thermal inertia), and safety (refrigerant leakage risk) by reducing the length of exposed refrigerant pipes. Furthermore, a new phased operation strategy was proposed for the novel terminal, and the adjustability of the terminal was improved. The results can be used as reference information for decarbonizing buildings by electrifying heating terminals.

Keywords： Novel heating terminal     Air-source heat pump     Structural improvement design     Maximum heating capacity     Rapid adjustability     Room temperature distribution    

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An adjustable anti-resonance frequency controller for a dual-stage actuation semi-active vibration isolation system Research Articles

Bo Zhao, Weijia Shi, Bingquan Wang, Jiubin Tan,shiweijia@hit.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 10,   Pages 1390-1401 doi: 10.1631/FITEE.2000373

Abstract: In the semiconductor manufacturing industry, the dynamic model of a controlled object is usually obtained from a frequency sweeping method before motion control. However, the existing isolators cannot properly isolate the disturbance of the inertial force on the platform base during frequency sweeping (the frequency is between 0 Hz and the natural frequency). In this paper, an for a system (DSA-SAVIS) is proposed. This system has a significant anti-resonance characteristic; that is, the vibration amplitude can drop to nearly zero at a particular frequency, which is called the anti-resonance frequency. The proposed controller is designed to add an adjustable anti-resonance frequency to fully use this unique anti-resonance characteristic. Experimental results show that the closed-loop transmissibility is less than −15 dB from 0 Hz to the initial anti-resonance frequency. Furthermore, it is less than −30 dB around an added anti-resonance frequency which can be adjusted from 0 Hz to the initial anti-resonance frequency by changing the parameters of the proposed controller. With the proposed controller, the disturbance amplitude of the payload decays from 4 to 0.5 mm/s with a reduction of 87.5% for the impulse disturbance applied to the platform base. Simultaneously, the system can adjust the anti-resonance frequency point in real time by tracking the frequency sweeping disturbances, and a good vibration isolation performance is achieved. This indicates that the DSA-SAVIS and the proposed controller can be applied in the guarantee of an ultra-low vibration environment, especially at frequency sweeping in the semiconductor manufacturing industry.

Keywords： 半主动隔振；双级驱动；动态吸振；可调反共振频率控制器    

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Title Author Date Type Operation

Band-gap tunable (GaxIn1−x)2O3 layer grown by magnetron sputtering

Fabi Zhang, Jinyu Sun, Haiou Li, Juan Zhou, Rong Wang, Tangyou Sun, Tao Fu, Gongli Xiao, Qi Li, Xingpeng Liu, Xiuyun Zhang, Daoyou Guo, Xianghu Wang, Zujun Qin,zhangfabi@outlook.com,qinzj@guet.edu.cn

Journal Article

Sb2Te3 topological insulator for 52 nm wideband tunable Yb-doped passively Q-switched fiber laser

Tao Wang, Qiang Yu, Kun Guo, Xinyao Shi, Xuefen Kan, Yijun Xu, Jian Wu, Kai Zhang, Pu Zhou,wujian15203@163.com,kzhang2015@sinano.ac.cn

Journal Article

A Thermo-Tunable Metamaterial as an Actively Controlled Broadband Absorber

Xiao-Chang Xing, Yang Cao, Xiao-Yong Tian, Lingling Wu

Journal Article

Analysis and Study of New Type Hydrostatic Bearing Restrictor With Very Good Restrictive Performance

Meng Xinzhai,Meng Zhaoyan

Journal Article

Tantalum (Oxy)Nitride: Narrow Bandgap Photocatalysts for Solar Hydrogen Generation

Mu Xiao, Songcan Wang, Supphasin Thaweesak, Bin Luo, Lianzhou Wang

Journal Article

Analysis on the Characteristics of Metal Belt Drive With Magnet

Luo Shanming,Guo Yingfu,Chen Anhua,Yu Yidao,Chen Lifeng

Journal Article

Towards adaptable and tunable cloud-based map-matching strategy for GPS trajectories

Aftab Ahmed CHANDIO,Nikos TZIRITAS,Fan ZHANG,Ling YIN,Cheng-Zhong XU

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

Dam Concrete Placement by Towerbelt

Peng Gang

Journal Article

Analysis of Influencing Factors on Transmission Ratio in Magnetic Metal Belt Transmission

Luo Shanming,Miao Xiexing

Journal Article

Principle of Laser Nano-meter Measurement Ruler

Zhang Shulian

Journal Article

The Latest Development of Optical Fiber, Optical Fiber Band and Optical Cable Technology Abroad

Liu Liangyan

Journal Article

Transparent Thermally Tunable Microwave Absorber Prototype Based on Patterned VO2 Film

Zhengang Lu, Yilei Zhang, Heyan Wang, Chao Xia, Yunfei Liu, Shuliang Dou, Yao Li, Jiubin Tan

Journal Article

Novel Radiation-Adjustable Heating Terminal Based on Flat Heat Pipe Combined with Air Source Heat Pump

Yifan Wu,Hongli Sun,Mengfan Duan,Borong Lin,Hengxin Zhao,Chaohung Liu

Journal Article

An adjustable anti-resonance frequency controller for a dual-stage actuation semi-active vibration isolation system

Bo Zhao, Weijia Shi, Bingquan Wang, Jiubin Tan,shiweijia@hit.edu.cn

Journal Article