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Supersolid and pair correlations of the extended Jaynes-Cummings-Hubbard model on triangular lattices

Physical Review A 2019年第3期100卷 033614-033614页

作者： Lijuan Guo Sebastian Greschner Siyu Zhu Wanzhou Zhang College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China Department of Quantum Matter Physics University of Geneva 1211 Geneva Switzerland Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education Taiyuan University of Technology Taiyuan 030024 China

We study the extended Jaynes-Cummings-Hubbard model on triangular cavity lattices and zigzag ladders. By using density-matrix renormalization-group methods, we observe various types of solids with different density patterns and find evidence for light supersolids, which exist in extended regions of the phase diagram of the zigzag ladder. Furthermore, we observe strong pair correlations in the supersolid phase due to the interplay between the atoms in the cavities and atom-photon interaction. By means of cluster mean-field simulations and a scaling of the cluster size extending our analysis to two-dimensional triangular lattices, we present evidence for the emergence of a light supersolid in this case also.

关键词： Supersolids Cold gases in optical lattices Hubbard model

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Study the gas sensing mechanism of oxygen atom on Pd doped ZnO (0001)

Study the gas sensing mechanism of oxygen atom on Pd doped Z...

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IEEE Conference on Nanotechnology

作者： Xiao Deng Jie Hu Shengbo Sang Pengwei Li Gang Li Wendong Zhang College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan Shanxi China Key Lab of Advanced Transducers and Intelligent Control System of the Ministry of Education Taiyuan University of Technology Taiyuan Shanxi China

In this paper, we investigate various surface structures of oxygen adsorption on Pd doping Zn-terminated ZnO (0001) by DFT. The results show that oxygen atom prefers to be adsorbed on the H sites of Pd substituting Zn atom of first Zn-O bilayers. The calculated PDOS indicates that a stronger interaction between adsorbed O2p and Pd4d orbitals has been happened at near the Fermi level. Finally, the bonding situation between adsorbed oxygen and surface is analyzed by electron density difference. The study reveals working mechanism of Pd-ZnO gas sensor, which is useful for finding the relationship between doping and sensitivity of sensor in experiment and theory.

关键词： Zinc oxide Adsorption Doping Surface cleaning Gas detectors Materials

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Fusion modeling of the hot rolling strip width

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Journal of Computational Information systems 2014年第12期10卷 5373-5380页

作者： Tian, Jianyan Wang, Fang Qiu, Huadong Li, Wenting College of Information Engineering Taiyuan University of Technology Taiyuan 030024 China Key Lab. of Advanced Transducers and Intelligent Control Syst. at Taiyuan Univ. of Technol. Ministry of Education Taiyuan 030024 China

By organically integrating the computation formulas of hot rolling strip width mechanism model with the intelligent modeling technique, this paper proposes an intelligent fusion modeling method for a hot rolling strip width model. Due to the relations between the variations of hot rolling strip width and factors such as the chemical composition of the slab., side compression of vertical rollers, thickness compression ratios, plate temperature, velocity and strain, and also the distinct influences by these factors mentioned afore, this paper adopts a neural network based on the improved particle swarm optimization to adjust parameters in the width mechanism model. It aims to give the mechanism model some level of self-learning and adaptive abilities, as to improve the model accuracy, broaden the range of applications, and also ensure modeling speed. In addition, in order to better control the head and tail shapes of the strip, an improvement about short stroke control has been made to the head and tail width model. Practical applications at a steelworks indicate that this method is feasible and effective by reducing width fluctuations of finished strips, raising steel yield rates and achieving favorable economical benefits. 1553-9105/Copyright © 2014 Binary Information Press.

关键词： Particle swarm optimization (PSO)

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In situ SERS monitoring of photocatalytic organic decomposition using recyclab.e TiO2-coated Ag nanowire arrays

In situ SERS monitoring of photocatalytic organic decomposit...

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作者： Bao, Zhi Yong Liu, Xin Dai, Jiyan Wu, Yucheng Tsang, Yuen Hong Lei, Dang Yuan Department of Applied Physics Hong Kong Polytechnic University Hong Kong Hong Kong Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan China Shenzhen Research Institute Hong Kong Polytechnic University Shenzhen Hong Kong College of Material Science and Engineering Hefei University of Technology Hefei China

Recently, semiconductor and noble metal complex nanomaterials have attracted ever-increasing attention because of the realization of multiple functionalities in a single entity. In this study, Ag-TiO2 core-shell nanocomposites were synthesized by hydrolysis of butyl titanate on the surface of Ag nanowires. Due to efficient electron transfer at the Ag-TiO2 interface, the as-prepared nanocomposites exhibit much higher photocatalytic activity than bare TiO2 films, as demonstrated by the enhanced photodegradation rate of R6G and methyl blue molecules. In the meanwhile, such nanocomposites serve as a high-sensitivity surface-enhanced Raman scattering (SERS) substrate for in situ monitoring of the photocatalytic decomposition reaction, and the substrate is recyclab.e due to its self-cleaning function. Full-wave numerical calculations reveal that the improved photocatalysis and SERS efficiencies are attributed to the largely enhanced electromagnetic near-field in the nanocomposites. Our results point out that bifunctional semiconductor-metal hybrids hold great promise for simultaneously detecting and decomposing organic pollutants in the environment. © 2014 Elsevier B.V. All rights reserved.

关键词： Titanium dioxide

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Singularity detection of magnetic memory signal of steel-cord conveyor belt

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Telkomnika - Indonesian Journal of Electrical Engineering 2013年第9期11卷 4904-4910页

作者： Tiezhu, Qiao Xiaolu, Li Xueying, Zhang Education Ministry Key Lab of Advanced Transducers and Intelligent Control System Taiyuan University of Technology Taiyuan 030024 China College of Information Engineering Taiyuan University of Technology Taiyuan 030024 China

Metal magnetic memory technology was an important method for detecting the steel-cord conveyor belt early fault, characteristics of magnetic memory signal extraction is critical for judging of the conveyor belt failure. Generally using of magnetic memory signal maximum gradient value can quickly judge the stress concentration zone, but the magnetic memory signal is susceptible to effected by environmental and noise;In view of the weak and non-stationary characteristics of magnetic memory signal, this paper has proposed the singularity detection method based on wavelet transform modulus maximum for metal magnetic memory signal, the method could exactly judged the stress concentration zone of joints and located the fault points of the steel-cord belt, the characteristic gradient of magnetic memory signal and the Lipschitz exponent were extracted. The result of simulation indicated the technology was effectively for judging the stress concentration zone and fault point. © 2013 Universitas Ahmad Dahlan.

关键词： Signal detection

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Corrigendum to “Surface stress-based biosensors” [Biosens. Bioelectron. 51 (2014) 124–135]

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Biosensors and Bioelectronics 2015年 73卷 265-266页

作者： Shengbo Sang Yuan Zhao Wendong Zhang Pengwei Li Jie Hu Gang Li MicroNano System Research Center Taiyuan University of Technology Taiyuan Shanxi 030024 People's Republic of China Key Lab of Advanced Transducers and Intelligent Control System of the Ministry of Education Taiyuan University of Technology Taiyuan Shanxi 030024 People's Republic of China

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Hals-770 Interlayer Simultaneously Block Internal and External Degradation Paths of Perovskite for Stability and High Efficiency Perovskite Solar Cells

SSRN

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SSRN 2024年

作者： Hu, Lina Zhang, Chenxi Wu, Yukun Li, Shiqi Ren, Jingkun Hao, Yang Sun, Qinjun Wang, Yulin Hao, Yuying College of Electronic Information and Optical Engineering Key Lab of Advanced Transducers and Intelligent Control System Taiyuan University of Technology Taiyuan030024 China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan030000 China

Here, we proposed a feasible solution using bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate (HALS-770) molecules as top protection layer of perovskite. The hindered amine groups of HALS-770 can form N-O· free radicals in oxygen environment and then react with superoxide (O2·-) to remove O2·- , hence improve the antioxidant ability of perovskite. Moreover, the water resistance of perovskite is improved by hydrophobic alkyl chains and hydrophilic groups adsorbing free water within perovskite, achieving double waterproof effect. HALS-770 not only suppress the external degradation path of perovskite but also block the channel of its internal degradation. The heterocyclic N atom and the carbonyl oxygen included in HALS-770 can coordinate with uncoordinated Pb2+ ions, block volatilization of organic cation and inhibit Ag+ and I- migration, thus improve thermal stability of perovskite and alleviate destruction of Ag electrode. As a result, the unencapsulated device maintains excellent stability over 95% of its initial efficiency after 30 days in ambient condition with about 25–50% humidity, and possesses remarkable continuous operation stability with projected T80 > 1400 h at maximum power point tracking in glove box, much higher than that the pristine device. Meanwhile, HALS-770 enable the achievement of efficiency of 21.89% , which is among the highest efficiencies for MAPbI3 based PSCs with p-i-n structure. Further, HALS-770 is used in FAMA-based devices with n-i-p structure, the efficiency of 23.03% and 20.73% are achieved for the devices with active area of 0.06 and 1.0 cm2, respectively. Also, HALS-770 devices show excellent stability. This work illustrates the key role of HALS-770 top interlayer in achieving high-performance photovoltaic devices. © 2024, The Authors. All rights reserved.

关键词： Perovskite

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Experimental demonstration of a thermal-EM concentrator for enhancing EM signals and converging heat fluxes simultaneously

arXiv

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arXiv 2024年

作者： Chen,, Hanchuan Liu,, Yichao Sun,, Fei Sun, Qianhan Wu,, Xiaoxiao Sun, Ran Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Electronic Information and Optical Engineering Taiyuan University of Technology Taiyuan030024 China Guangzhou510000 China

Simultaneously concentrating EM waves and heat fluxes to the same target region within an on-chip system carries substantial academic research importance and practical application value. Nevertheless, existing researches are primarily aimed at the design and experimentation of concentrators for individual EM waves or temperature fields. In this work, a thermal-EM concentrator, capable of simultaneously concentrating EM waves and heat fluxes, is designed using transformation optics/thermodynamics and fabricated with engineered EM-thermal metamaterials. The concentrating effects of the proposed thermal-EM concentrator on the thermal fluxes and EM waves are verified through numerical simulations and experimental measurements, respectively, which are in good agreement with each other. Both numerically simulated and experimentally measured results demonstrate the concentrating capability of the proposed thermal-EM concentrator, which can concentrate broadband TM-polarized EM waves ranging from 8-12 GHz and heat/cold flows to the same target region within an on-chip operating environment. The thermal-EM concentrator exhibits a thermal focusing efficiency close to 100% and more than three times enhancement of the magnetic field at the designed center frequency of 10 GHz. The proposed thermal-EM concentrator can be utilized for efficient cooling for the specified component and simultaneously enhancing the EM antenna's radiation/reception efficiency within an on-chip system. Copyright © 2024, The Authors. All rights reserved.

关键词： Heat flux

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HALS-770 interlayer simultaneously block internal and external degradation paths of perovskite for stability and high efficiency perovskite solar cells

HALS-770 interlayer simultaneously block internal and extern...

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第十一届新型太阳能材料科学与技术学术研讨会

作者： Lina Hu Chenxi Zhang Yukun Wu Shiqi Li Fan Zhang Jingkun Ren Yang Hao Qinjun Sun Yulin Wang Yuying Hao College of Electronic Information and Optical Engineering Key Lab of Advanced Transducers and Intelligent Control SystemTaiyuan University of Technology School of Physics and Optoelectronic Engineering Faculty of Information Science and EngineeringOcean University of China

The stability of perovskite solar cells （PSCs） is a major problem limiting their ***,we proposed a feasible solution using bis（2,2,6,6-tetramethyl-4-piperidyl） sebacate（HALS-770） as top protection layer of ***-770 interlayer can not only improve the antioxidant ability of perovskite by removing superoxide (O) with help of hindered amine groups,but also suppress the internal and external degradation path of perovskite due to the co-existence of hydrophilic and hydrophobic ***,it can block volatilization of organic cation and the migration of Agand I,thus improve thermal stability of perovskite and alleviate destruction of Ag *** addition,the heterocycles N atom and carbonyl group in HALS-770 interact with the under-coordinated Pb,reducing the interface *** a result,the unencapsulated device maintains excellent stability over95%of its initial efficiency after 30 days in ambient condition with about 25–50%humidity,and possesses remarkable continuous operation stability with projected T80>1400 h at maximum power point tracking in glove box,much higher than those of the pristine ***,HALS-770 enable the PCE of 21.88%for PSC （0.06 cm）,which is among the highest efficiencies for MAPbI based PSCs with p-i-n structure,and the PCE of 19.07%for PSM （4 cm）.And it is also suitable for FAMA-based devices with n-i-p structure,enabling an efficiency of 23.03%（0.06 cm） and excellent stability.

关键词： Perovskite solar cell External degradation Internal degradation Stability

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Association rules mining algorithm using sharing mechanism niche leaping ant colony based on apriori algorithm

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Journal of Computational and Theoretical Nanoscience 2015年第10期12卷 3223-3231页

作者： Wang, Yang Xu, Yakun Li, Gang Wang, Hongliang MicroNano System Research Center College of Information Engineering Taiyuan University of Technology Taiyuan Shanxi China Key Lab of Advanced Transducers and Intelligent Control System of the Ministry of Education Taiyuan University of Technology Taiyuan Shanxi China Ministry of Education North University of China Taiyuan China

Based on the alarm data in the information communication network under the context of big data, the paper discusses the classic association mining algorithms of Apriori and FP-Growth with living examples, elab.rates the ant colony algorithm and the niche technology, combines the Apriori algorithm thought and the Travelling Salesman Problem (TSP) of the ant colony algorithm, and proposes association rules mining algorithm using Sharing mechanism Niche Leaping Ant Colony based on Apriori algorithm (SN-APLAC algorithm). The algorithm achieves the thought of "leaping ants" by accelerating support calculation through a sparse linked list and setting the route point of non frequent item sets as "stimulation point" and retains the local optimal solution to further improve the quality of association rules mining utilizing the technique of sharing mechanism niche. Copyright © 2015 American Scientific Publishers.

关键词： Association rules

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