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phase control and stabilization of 1T-MoS_(2) via black TiO_(2-x)nanotube arrays supporting for electrocatalytic hydrogen evolution

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Journal of Energy Chemistry 2022年第5期31卷 71-77页

作者： Ting Zhang Tingxuan Yang Guoxing Qu Saifang Huang Peng Cao Wei Gao Department of Chemical and Materials Engineering the University of AucklandPrivate Bag 92019Auckland 1142New Zealand School of Material Science and Engineering Nanchang UniversityNanchang 330031JiangxiChina School of Materials Science and Engineering Jiangsu University of Science and TechnologyJiangsu 212003ZhenjiangChina

1T phase MoS_(2)(1T-MoS_(2)) is a promising substitute of platinum electrocatalyst for hydrogen evolution reaction(HER)due to its high intrinsic activity but suffering from thermodynamical *** great efforts have been made to synthesize 1T-MoS_(2) and enhance its stability,it remains a big challenge to realize the phase control and stabilization of 1T-MoS_(2).Herein,based on crystal field theory analysis,we propose a new solution by designing an electrocatalyst of 1T-MoS_(2) nanosheets anchoring on black TiO2-xnanotube arrays in-situ grown on Ti plate(1T-MoS_(2)/TiO_(2-x)@Ti).The black TiO_(2-x)substrate is expected to play as electron donors to increase the charge in Mo 4 d orbits of 1T-MoS_(2) and thus weaken the asymmetric occupation of electrons in the Mo 4 d *** results demonstrate that black TiO_(2-x)nanotubes shift electrons to MoS_(2) and induce MoS_(2) to generate more 1 T phase due to stabilizing the 1T-MoS_(2) nanosheets compared with a Ti *** 1T-MoS_(2/)TiO_(2-x)@Ti shows much improved HER performance with a small Tafel slope of 42 m V dec^(-1) and excellent catalytic stability with negligible degradation for 24 *** calculations confirm that the black TiO_(2-x)substrate can effectively stabilize metastable 1T-MoS_(2) due to electrons transferring from black TiO_(2-x)to Mo 4 d *** work sheds light on the instability of 1T-MoS_(2) and provides an essential method to stabilize and efficiently utilize 1T-MoS_(2) for HER.

关键词： 1T-MoS_(2) Black TiO_(2-x)nanotube Hydrogen evolution reaction phase control Electrocatalyst

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Enhanced Cross-phase Modulation via phase control in a Quantum dot Nanostructure

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Communications in Theoretical Physics 2012年第5期57卷 866-872页

作者：郝向英郑安寿王英李小刚 School of Science Wuhan Institute of Technology School of Mathematics and Physics China University of Geosciences

A four-level quantum dot (QD) nanostructure interacting with four fields (two weak near-infrared (NIR) pulses and two control fields) forms the well-known double-cascade *** investigate the cross-phase modulation (XPM) between the two NIR *** results show,in such a closed-loop scheme,that the XPM can be greatly enhanced,while the linear absorption and two-photon absorption (gain) can be efficiently depressed by tuning the relative phase among the applied *** protocol may have potential applications in NIR all-optical switch design and quantum information processing with the solid-state materials.

关键词： cross-phase modulation (XPM) phase control quantum dot (QD)

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phase control in an open A-type system with spontaneously generated coherence

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Chinese Physics B 2007年第3期16卷 718-724页

作者：崔妮樊锡君李爱云刘呈普龚尚庆徐至展 Department of Physics Shandong Norma/University Jinan 250014 China Institute of Advanced Energy Kyoto University Gokasho Uji Kyoto 611-0011 Japan Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China

This paper investigates the control role of the relative phase between the probe and driving fields on the gain, dispersion and populations in an open A system with spontaneously generated coherence （SGC）. It shows that by adjusting the value of the relative phase, a change from lasing with inversion to lasing without inversion can be realized; the values and frequency spectrum regions of the inversionless gain and dispersion can be obviously varied; high refractive index with zero absorption and electromagnetically induced transparency can be achieved. It is also found that when the driving field is resonant, the shapes of the dispersion and the gain curves versus the probe detuning are very similar if the relative phase of the dispersion lags π/2 than that of the gain, however for the off-resonant driving field the similarity will disappear; the gain, dispersion and populations are periodical functions of the relative phase, the modulation period is always 2π; the contribution of SGC to the inversionless gain and dispersion is much larger than that of the dynamically induced coherence.

关键词： spontaneously generated coherence phase control electromagnetically induced transparency lasing without inversion

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Optical phase control for MMW sparse aperture upconversion imaging

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Chinese Optics Letters 2014年第5期12卷 23-28页

作者：何云涛黄海平江月松张跃东 School of Electronic and Information Engineering Beihang University Beijing Institute of Space Mechanics and Electricity

The random phase errors of the optical carriers are discussed and controlled for passive millimeter-wave sparse aperture （PMMW SA） upconversion imaging. A two-channel model is set up for analyzing charac- teristics of the phase errors, and an active optical control technique based on stochastic parallel gradient decent algorithm （SPGD controller） is proposed to calibrate the phase errors. To demonstrate the feasi- bility of the SPGD controller, simulations are performed and an experimental system with a two-channel fiber array is set up. Simulation and experiment results show that the SPGD controller can effectively and rapidly compensate the phase errors of the optical carrier, and the accuracy of the phase control is sufficient for imagine svstems.

关键词： controllers phase control Stochastic models Stochastic systems

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Deep-learning-based phase control method for tiled aperture coherent beam combining systems

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High Power Laser Science and Engineering 2019年第4期7卷 8-14页

作者： Tianyue Hou Yi An Qi Chang Pengfei Ma Jun Li Dong Zhi Liangjin Huang Rongtao Su Jian Wu Yanxing Ma Pu Zhou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Hypervelocity Aerodynamics Institute China Aerodynamics Research and Development CenterMianyang 621000China

We incorporate deep learning(DL)into tiled aperture coherent beam combining(CBC)systems for the first time,to the best of our *** using a well-trained convolutional neural network DL model,which has been constructed at a non-focal-plane to avoid the data collision problem,the relative phase of each beamlet could be accurately estimated,and then the phase error in the CBC system could be compensated directly by a servo phase control *** feasibility and extensibility of the phase control method have been demonstrated by simulating the coherent combining of different hexagonal *** DL-based phase control method offers a new way of eliminating dynamic phase noise in tiled aperture CBC systems,and it could provide a valuable reference on alleviating the long-standing problem that the phase control bandwidth decreases as the number of array elements increases.

关键词： coherent beam combining deep learning phase control

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Multi-input multi-output random vibration control using Tikhonov filter

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Chinese Journal of Aeronautics 2016年第6期29卷 1649-1663页

作者： Cui Song Chen Huaihai He Xudong Zheng Wei State Key Laboratory of Mechanics and control of Mechanical Structures Nanjing University of Aeronautics and Astronautics

Noises always disturb the control effect of an environment test especially in multi-input multi-output(MIMO) systems. If the frequency response function matrices are ill-conditioned, the noises in the driving forces will be amplified and the response spectral lines may awfully exceed their tolerances. Most of the major biases between the response spectra and the reference spectra are produced by the amplified noises. However, ordinary control algorithms can hardly reduce the level of noises. The influences of the noises on both the auto- and cross-power spectra are analyzed in this paper. As a conventional frequency domain method on the inverse problem, the Tikhonov filter is adopted in the environment test to suppress the exceeding spectral lines. By altering regularization parameters gradually, the auto-power spectra can be improved in a closed control loop. Instead of using the traditional way of selecting regularization parameters, we observe the coherence change to estimate noise eliminations. Incidentally, the requirement of coherence control can be realized. The errors of the phase are then studied and a phase control algorithm is introduced at the end as a supplement of cross-power spectra control. The Tikhonov filter and the proposed phase control algorithm are tested numerically and experimentally. The results show that the noises in the vicinity of lightly damped resonant peaks are more stubborn. The response spectra are able to be greatly improved by the combination of these two methods.

关键词： Coherence Environmental testing Multi-input multi-output(MIMO) Noise phase control Tikhonov filter

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Face-centered cubic structured RuCu hollow urchin-like nanospheres enable remarkable hydrogen evolution catalysis

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Science China Chemistry 2022年第1期65卷 87-95页

作者： Juntao Zhang Jiabo Le Yuanting Dong Lingzheng Bu Ying Zhang Jun Cheng Leigang Li Xiaoqing Huang State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China

Ruthenium(Ru)is one of the most promising metals for its versatility in driving a wide range of catalytic ***,owing to the intrinsic preference of hexagonal close-packed(hcp)phase for bulk Ru,currently,it is still challenging to construct Ru-based nanomaterials with face-centered-cubic(fcc)phase for optimizing their performance towards potential ***,we report a facile wet-chemical method to directly create unconventional fcc-structured Ru-copper hollow urchin-like nanospheres(fcc-RuCu HUNSs)as a class of efficient pH-universal hydrogen evolution reaction(HER)***,this synthetic strategy can be expanded to prepare other fcc-Ru-based alloy ***,the novel fcc-RuCu HUNSs exhibit superior HER performance with the overpotential of only 25,34,40,and 26 m V to reach the current density of 10 mA cm^(-2)in 0.5 M H_(2)SO_(4),0.05 M H_(2)SO_(4),0.1 M KOH,and 1 M KOH,respectively,much lower than those of hcpRuCu HUNSs and commercial Pt/*** functional theory(DFT)calculations further indicate that their excellent pH-universal HER performance results from the optimized adsorption free energy of H and work *** work highlights the importance of phase control to design high-efficiency nanocatalysts for relevant catalytic reactions in energy conversion.

关键词： ruthenium phase control face-centered cubic hydrogen evolution catalysis pH-universal

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phase-controlled coherent population trapping in superconducting quantum circuits

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Chinese Physics B 2015年第4期24卷 215-220页

作者：程广玲王一平陈爱喜 Department of Applied Physics East China Jiaotong University Institute for Quantum Computing University of Waterloo

We investigate the influences of the-applied-field phases and amplitudes on the coherent population trapping behavior in superconducting quantum circuits. Based on the interactions of the microwave fields with a single A-type three-level fluxonium qubit, the coherent population trapping could be obtainable and it is very sensitive to the relative phase and amplitudes of the applied fields. When the relative phase is tuned to 0 or π, the maximal atomic coherence is present and coherent population trapping occurs. While for the choice of π/2, the atomic coherence becomes weak. Meanwhile, for the fixed relative phase π/2, the value of coherence would decrease with the increase of Rabi frequency of the external field coupled with two lower levels. The responsible physical mechanism is quantum interference induced by the control fields, which is indicated in the dressed-state representation. The microwave coherent phenomenon is present in our scheme, which will have potential applications in optical communication and nonlinear optics in solid-state devices.

关键词： coherent population trapping phase control superconducting quantum circuits

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controllable synthesis of titania/reduced graphite oxide nanocomposites with various titania phase compositions and their photocatalytic performance

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Science China Chemistry 2012年第7期55卷 1294-1302页

作者： ZHAO YanFei XIE Yun SUN ZhenYu ZHANG HongYe TAO RanTing HUANG ChangLiang LIU ZhiMin Beijing National Laboratory for Molecular Sciences Institute of ChemistryChinese Academy of SciencesBeijing 100080China

A facile method is presented for preparing TiO2/reduced graphite oxide （RGO） nanocomposites with phase-controlled TiO2 nanoparticles via redox reaction between the reductive titanium （III） precursor and graphite oxide （GO）, and a series of TiO2/RGO composites with various TiO2 phase compositions were obtained. In all the titania/RGO composites, the TiO2 nanoparticles were uniformly distributed on the surface of the RGO. The TiO2 consisted of anatase phase particles in the form of square-plates with edges less than 10 nm and the rutile phase nanorods in diameters less than 10 nm. The performances of the as-prepared TiO2/RGO composites were investigated on catalytically degrading phenol under visible light irradiation. The TiO2/RGO composites can effectively degrade phenol under visible light irradiation, and the phase composition of TiO2 in the composites significantly influences the activities of these catalysts.

关键词： titania phase control reduced graphite oxide composite

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Extracting DC bus current information for optimal phase correction and current ripple in sensorless brushless DC motor drive

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第4期15卷 312-320页

作者： Zu-sheng HO Chii-maw UANG Ping-chieh WANG Department of Electronic Engineering I-Shou University

Brushless DC motor(BLDCM) sensorless driving technology is becoming increasingly established. However, optimal phase correction still relies on complex calculations or algorithms. In finding the correct commutation point, the problem of phase lag is introduced. In this paper, we extract DC bus current information for auto-calibrating the phase shift to obtain the correct commutation point and optimize the control of BLDC sensorless driving. As we capture only DC bus current information, the original shunt resistor is used in the BLDCM driver and there is no need to add further current sensor components. Software processing using only simple arithmetic operations successfully accomplishes the phase correction. Experimental results show that the proposed method can operate accurately and stably at low or high speed, with light or heavy load, and is suitable for practical applications. This approach will not increase cost but will achieve the best performance/cost ratio and meet market expectations.

关键词： Brushless motors Electric motors Motor drives phase control phase estimation Sensorless control

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