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CsPbI nanorods as the interfacial layer for high-performance,all-solution-processed self-powered photodetectors

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Journal of Materials Science & Technology 2021年第16期75卷 196-204页

作者： Muhammad Imran Saleem Shangyi Yang Attia Batool Muhammad Sulaman Chandrasekar Perumal Veeramalai Yurong Jiang yi tang Yanyan Cui Libin tang Bingsuo Zou Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems.Center for Micro-Nanotechnology School of PhysicsKey Laboratory of Advanced Optoelectronic Quantum Design and Measurement.Ministry of EducationBeijing Institute of TechnologyBeijing 100081China Kunming Institute of Physics Kunming 650223China Research Center for Materials Science Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China

Heterojunction is regarded as a crucial step toward realizing high-performance devices,particularly,forming gradient energy band between heterojunctions benefits self-powered ***,in this paper,the synthesis of CsPbI3 nanorods(NRs)and its application as the interfacial layer in high-performance,all-solution-processed self-powered photodetectors are *** the bilayer photodetector ITO/ZnO(100 nm)/PbS-TBAI(150 nm)/Au,a responsivity of 3.6 A/W with a specific detectivity of 9.8×10^(12)Jones was obtained under 0.1 mW/cm^(2)white light illumination at zero bias(*** self-powered mode).Meanwhile,the photocurrent was enhanced to an On/Off current ratio of 105 at zero bias with an open circuit voltage of 0.53 V for trilayer photodetector ITO/ZnO(100 nm)/PbSTBAI(150 nm)/CsPbI3(250 nm)/Au,in which the CsPbI3 NRs layer works as the interfacial *** a result,a specific detectivity of 4.5×10^(13)Jones with a responsivity of 11.12 A/W was obtained under0.1 mW/cm^(2) white light illumination,as well as the rising/decaying time of 0.57 s/0.41 s with excellent stability and reproducibility upto four weeks in *** enhanced-performance is ascribed to the mismatch bandgap between PbS-TBAI/CsPbI_(3)interface,which can suppress the carrier recombination and provide efficient transport passages for charge ***,it provides a feasible and efficient method for high-performance photodetectors.

关键词： Perovskite Interfacial layer Charge carrier recombination Built-in potential Charge carrier separation Self-powered photodetector

Optimal configuration of distributed power flow controller to enhance system loadability via mixed integer linear programming

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Journal of Modern Power Systems and Clean Energy 2019年第6期7卷 1484-1494页

作者： Jianfeng DAI yi tang Yuqian LIU Jia NING Qi WANG Ninghui ZHU Jingbo ZHAO College of Electrical Engineering Southeast UniversityNanjing 210096China China EPSI Science&Technology Company Beijing 102200China State Grid Jiangsu Electric Power Company Research Institute Nanjing 211100China

The increase of energy consumption has caused power systems to operate close to the limit of their *** distributed power flow controller(DPFC),as a new member of distributed flexible AC transmission systems,is introduced to remove this *** paper proposes an optimal DPFC configuration method to enhance system loadability considering economic performance based on mixed integer linear *** conflicting behavior of system loadability and DPFC investment is analyzed and optimal solutions are ***,the fuzzy decision-making method is implemented for determining the most preferred *** the most preferred solution obtained,the investment of DPFCs is minimized to find the optimal number,locations and set *** results on the IEEERTS79 system demonstrate that the proposed method is effective and reasonable.

关键词： Distributed power flow controller(DPFC) Optimal configuration System loadability Mixed integer linear programming

Unsupervised Recognition of Informative Features via Tensor Network Machine Learning and Quantum Entanglement Variations

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Chinese Physics Letters 2022年第10期39卷 12-16页

作者： Sheng-Chen Bai yi-Cheng tang Shi-Ju Ran Department of Physics Capital Normal UniversityBeijing 100048China

Given an image of a white shoe drawn on a blackboard,how are the white pixels deemed(say by human minds)to be informative for recognizing the shoe without any labeling information on the pixels?Here we investigate such a“white shoe”recognition problem from the perspective of tensor network(TN)machine learning and quantum *** a generative TN that captures the probability distribution of the features as quantum amplitudes,we propose an unsupervised recognition scheme of informative features with variations of entanglement entropy(EE)caused by designed *** this way,a given sample,where the values of its features are statistically meaningless,is mapped to the variations of EE that statistically characterize the gain of *** show that the EE variations identify the features that are critical to recognize this specific sample,and the EE itself reveals the information distribution of the probabilities represented by the TN *** signs of the variations further reveal the entanglement structures among the *** test the validity of our scheme on a toy dataset of strip images,the MNIST dataset of hand-drawn digits,the fashion-MNIST dataset of the pictures of fashion articles,and the images of nerve *** scheme opens the avenue to the quantum-inspired and interpreted unsupervised learning,which can be applied to,e.g.,image segmentation and object detection.

关键词： quantum scheme tensor

Mercury flows in large-scale gold production and implications for Hg pollution control

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Journal of Environmental Sciences 2018年第6期30卷 91-99页

作者： Qingru Wu Shuxiao Wang Mei Yang Haitao Su Guoliang Li yi tang Jiming Hao State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084 China College of Electromechanical Engineering Qingdao University of Science and Technology Qingdao 266061 China

Large-scale gold production（LSGP） is one of the five convention-related atmospheric mercury（Hg） emission sources in the Minamata Convention on Mercury. However, field experiments on Hg flows of the whole process of LSGP are limited. To identify the atmospheric Hg emission points and understand Hg emission characteristics of LSGP, Hg flows in two gold smelters were studied. Overall atmospheric Hg emissions accounted for 10%–17% of total Hg outputs and the Hg emission factors for all processes were 7.6–9.6 kg/ton. There were three dominant atmospheric Hg emission points in the studied gold smelters, including the exhaust gas of the roasting process, exhaust gas from the environmental fog collection stack and exhaust gas from the converter of the refining process. Atmospheric Hg emissions from the roasting process only accounted for 16%–29% of total emissions and the rest were emitted from the refining process. The overall Hg speciation profile（gaseous elemental Hg/gaseous oxidized Hg/particulate-bound Hg） for LSGP was 34.1/57.1/8.8. The dominant Hg output byproducts included waste acid, sulfuric acid and cyanide leaching residue. Total Hg outputs from these three byproducts were 80% in smelter A and 84% in smelter B. Our study indicated that previous atmospheric Hg emissions from large-scale gold production might have been *** emission control in LSGP is not especially urgent in China compared to other significant emission sources（e.g., cement plants）. Instead, LSGP is a potential Hg release source due to the high Hg output proportions to acid and sludge.

关键词： Large-scale gold production Mercury Flow analysis Emission characteristics

Envelope Solitons Perturbed by Stochastic Noise

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Communications in Theoretical Physics 2009年第11期52卷 897-900页

作者： REN Xi-Mei ZENG Shang-You ZHAO De-Jiang tang yi Faculty of Materials Optoelectronics and Physics Xiangtan University Xiangtan 411005 China

We perform langevin dynamics simulation for envelope solitons in an FPU-β lattice,with the nearestneighborinteraction and quartic *** get the motion equations of our discrete system by adding noiseand damping to the set of deterministic motion *** define'half-time'as the time when the amplitude of theenvelope soliton decreases by half due to *** then the mass,center and half-time of the perturbed envelopesoliton are numerically simulated,beginning with the discrete envelope soliton at *** show successfully hownoise affects behavior of the envelope soliton.

关键词： envelope soliton noise damping

Oscillating Propagation of Kink in Nondissipative Frenkel-Kontorova Chain Due to External DC Force

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Communications in Theoretical Physics 2009年第4期51卷 765-767页

作者： ZENG Shang-You tang yi REN Xi-Mei ZHAO De-Jiang Department of Physics Xiangtan University Xiangtan 411105 China

We report the oscillating propagation of kink in a nondissipative Frenkel-Kontorova （FK） chain driven by external DC force, which is different from the usual propagation of localized modes with equal speed. When the kink moves in the opposite direction of the external DC force, the kink will be accelerated and the potential of the FK chain in the external force field is transformed to be the kinetic energy of the kink. If the kink reaches the boundary of the FK chain, the kink will be bounced back and moves in the opposite direction, then the kink will be decelerated gradually and the kinetic energy of the kink ＆ transformed to be the potential of the FK chain in the external force field. If the speed of the kink reaches zero, the kink will move in the opposite direction again driven by the external DC force, and a new oscillating cycle begins. Simulation result demonstrates exactly the transformation between the kinetic energy of the kink and the potential of the FK chain in the external force field. The interesting energy exchange is induced by the special topology of kinks, and other localized modes, such as breathers and envelope solitons, have no the interesting phenomenon.

关键词： kink nondissipative Frenkel Kontorova chain oscillating propagation external DC force

Optimal ConfigurationMethod forMulti-Type Reactive Power Compensation Devices in Regional Power Grid with High Proportion ofWind Power

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Energy Engineering 2024年第11期121卷 3331-3353页

作者： ying Wang Jie Dang Cangbi Ding Chenyi Zheng yi tang Central China Branch of State Grid Wuhan430077China School of Electrical Engineering Southeast UniversityNanjing211100China

As the large-scale development of wind farms(WFs)progresses,the connection ofWFs to the regional power grid is evolving from the conventional receiving power grid to the sending power grid with a high proportion of wind power(WP).Due to the randomness of WP output,higher requirements are put forward for the voltage stability of each node of the regional power grid,and various reactive power compensation devices(RPCDs)need to be rationally configured to meet the stable operation requirements of the *** paper proposes an optimal configuration method for multi-type RPCDs in regional power grids with a high proportion of *** RPCDs are located according to the proposed static voltage stability index(VSI)and dynamicVSI based on dynamic voltage drop area,and the optimal configuration model of RPCDs is constructed with the lowest construction cost as the objective function to determine the installed capacity of various ***,the corresponding regional power grid model for intensive access to WFs is constructed on the simulation platform to verify the effectiveness of the proposed method.

关键词： Wind power reactive power compensation device optimal configuration model voltage stability

Ordered Arrangement of Different Metals in Discrete and Infinite Building Blocks for Heterometallic Metal-Organic Frameworks Construction

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Chemical Research in Chinese Universities 2023年第6期39卷 902-906页

作者： XU Huoshu YAN Yu WU yichen WANG Junyi tang yi LI Qiaowei Department of Chemistry Collaborative Innovation Center of Chemistry for Energy MaterialsShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200433P.R.China

Construction of sophisticated metal-organic frameworks(MOFs)with multiple kinds of metals is essential for further advancement of porous materials toward various *** and arrangement of the metals in the secondary building units(SBUs)greatly influence the MOF structures *** most of the previous heterometallic MOFs either have multiple kinds of discrete SBUs with different metals,or single kind of SBU with mixed metals inside,other forms of metal distribution still need further ***,a bifunctional linker is applied to achieving differential coordination toward different *** Ce and Cu serving as the carboxylate-philic and pyrazole-philic metal ions,three heterometallic MOFs(FDM-121—FDM-123)are *** addition to the common metal arrangement modes,the new MOFs provide a joint reticulation of a discrete SBU and an infinite chain-like SBU featuring different metals in FDM-121,and an assembly from heterometallic infinite chain-like SBU in *** study demonstrates the potential of bifunctional linkers for the design and synthesis of heterometallic MOFs and opens up the possibilities to create MOFs with tailored properties for specific applications.

关键词： Heterometallic Metal-organic framework Secondary building unit Bifunctional

A NOTE ON THE CONSTRUCTION OF SYMPLECTIC SCHEMES FOR SPLITABLE HAMILTONIAN H = H^((1)) + H^((2)) + H^((3))

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Journal of Computational Mathematics 2002年第1期20卷 89-96页

作者： yi-fa tang (LSEC ICMSEC Academy of Mathematics and System Sciences, Chinese Academy of Sciences, Beijing 100080, China) 中科院数学与系统科学院 LSEC ICMSEC CAS 北京 100080

In this note, we will give a proof for the uniqueness of 4th-order time-reversible sym- plectic difference schemes of 13th-fold compositions of phase flows φtH(1) , φtH(2) , φtH(3) with different temporal parameter... 详细信息

关键词： Time-Reversible symplectic scheme Splitable hamiltonian.