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Coupling and readout of semiconductor quantum dots with a superconducting microwave resonator

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Science China(Physics,Mechanics & Astronomy) 2023年第3期66卷 1-10页

作者： Yong-qiang Xu Si-Si Gu Ting lin Bao-Chuan Wang Hai-Ou Li Gang Cao guo-Ping guo CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China Origin Quantum Computing Company Limited Hefei 230088China

In a circuit quantum electrodynamics(circuit QED) architecture, the microwave resonator could be used to couple and probe qubits. The long-range coupling and information transfer between nonlocal qubits can be performed via photons trapped in a microwave resonator, promising an effective approach for scaling up solid-state qubits. A series of important advances in the hybrid system composed of a microwave resonator and semiconductor qubits have been achieved in recent years. For instance,with applications of high-impedance microwave resonators, the strong coupling regime between charge/spin qubits and a microwave resonator has been reached. Simultaneously, resonator-based dispersive readout and single-shot readout to probe the qubit state have been further improved due to the increase of the coupling strength. Here, we briefly introduce this hybrid system related to the progress and fruits in achieving the strong coupling between charge/spin qubits in double quantum dots(DQDs)and the resonator, the long-range coupling between qubits, and also the applications of the resonator for qubit state readout.

关键词： quantum dots hybrid system circuit QED strong coupling long-range coupling qubit state readout

A KIND OF IMPLICIT ITERATIVE METHODS FOR ILL-POSEDOPERATOR EQUATIONS

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Journal of Computational Mathematics 1999年第3期17卷 275-284页

作者： guo-qiang He lin-clan Liu(Department of Mathematics, Shanghai University, Jiading Campus, Shanghai 201800, China) 上海大学数学系上海

In this paper we propose a kind of implicit iterative methods for solving ill-posed operator equations and discuss the properties of the methods in the case that the control parameter is fixed. The theoretical results show that the new methods have certain important features and can overcome some disadvantages of Tikhonov-type regularization and explicit iterative methods. Numerical examples are also given in the paper, which coincide well with theoretical results.

关键词： ill-posed equation implicit iterative method control parameter discrepamcy principle optimal convergence rate

Redesigned Surface Based Machining Strategy and Method in Peripheral Milling of Thin-walled Parts

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Chinese Journal of Mechanical Engineering 2010年第3期23卷 282-287页

作者： JIA Zhenyuan guo qiang SUN Yuwen guo Dongming Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education Dalian University of Technology Dalian 116024 China

Currently, simultaneously ensuring the machining accuracy and efficiency of thin-walled structures especially high performance parts still remains a challenge. Existing compensating methods are mainly focusing on 3-aixs machining, which sometimes only take one given point as the compensative point at each given cutter location. This paper presents a redesigned surface based machining strategy for peripheral milling of thin-walled parts. Based on an improved cutting force/heat model and finite element method（FEM） simulation environment, a deflection error prediction model, which takes sequence of cutter contact lines as compensation targets, is established. And an iterative algorithm is presented to determine feasible cutter axis positions. The final redesigned surface is subsequently generated by skinning all discrete cutter axis vectors after compensating by using the proposed algorithm. The proposed machining strategy incorporates the thermo-mechanical coupled effect in deflection prediction, and is also validated with flank milling experiment by using five-axis machine tool. At the same time, the deformation error is detected by using three-coordinate measuring machine. Error prediction values and experimental results indicate that they have a good consistency and the proposed approach is able to significantly reduce the dimension error under the same machining conditions compared with conventional methods. The proposed machining strategy has potential in high-efficiency precision machining of thin-walled parts.

关键词： redesigned surface tool path part deflection error prediction finite element method

New Mathematical Method for the Determination of Cutter Runout Parameters in Flat-end Milling

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Chinese Journal of Mechanical Engineering 2012年第5期25卷 947-952页

作者： guo qiang SUN Yuwen guo Dongming ZHANG Chuantai Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalian 116024China

The cutting force prediction is essential to optimize the process parameters of machining such as feed rate optimization, etc. Due to the significant influences of the runout effect on cutting force variation in milling process, it is necessary to incorporate the cutter runout parameters into the prediction model of cutting forces. However, the determination of cutter runout parameters is still a challenge task until now. In this paper, cutting process geometry models, such as uncut chip thickness and pitch angle, are established based on the true trajectory of the cutting edge considering the cutter runout effect. A new algorithm is then presented to compute the cutter runout parameters for flat-end mill utilizing the sampled data of cutting forces and derived process geometry parameters. Further, three-axis and five-axis milling experiments were conducted on a machining centre, and resulting cutting forces were sampled by a three-component dynamometer. After computing the corresponding cutter runout parameters, cutter forces are simulated embracing the cutter runout parameters obtained from the proposed algorithm. The predicted cutting forces show good agreements with the sampled data both in magnitude and shape, which validates the feasibility and effectivity of the proposed new algorithm of determining cutter runout parameters and the new way to accurately predict cutting forces. The proposed method for computing the cutter runout parameters provides the significant references for the cutting force prediction in the cutting process.

关键词： flat end milling cutter runout cutting force five-axis machining

Method for rapid warning and activity concentration estimates in online waterγ-spectrometry systems

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Nuclear Science and Techniques 2024年第3期35卷 1-12页

作者： Meng Wang Yi Gu Mao-lin Xiong Liang-Quan Ge Qing-Xian Zhang guo-qiang Zeng Heng Lu Sheng-Liang guo College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610059China Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province (Chengdu University of Technology)Chengdu 610059China Chengdu New Ray Technology Co.Ltd Chengdu 610052China

Onlineγ-spectrometry systems for inland waters,most of which extract samples in situ and in real time,are able to produce reliable activity concentration measurements for waterborne radionuclides only when they are distributed relatively uniformly and enter into a steady-state diffusion regime in the measurement *** protect residents’health and ensure the safety of the living environment,better timeliness is required for this measurement *** address this issue,this study established a mathematical model of the online waterγ-spectrometry system so that rapid warning and activity estimates can be obtained for water under non-steady-state(NSS)*** addition,the detection efficiency of the detector for radionuclides during the NSS diffusion process was determined by applying the computational fluid dynamics technique in conjunction with Monte Carlo *** this basis,a method was developed that allowed the online waterγ-spectrometry system to provide rapid warning and activity concentration estimates for radionuclides in *** analysis of the NSS-mode measurements of^(40)K radioactive solutions with different activity concentrations determined the optimum warning threshold and measurement time for producing accurate activity concentration estimates for *** experimental results show that the proposed NSS measurement method is able to give warning and yield accurate activity concentration estimates for radionuclides 55.42 and 69.42 min after the entry of a 10 Bq/L^(40)K radioactive solution into the measurement chamber,*** times are much shorter than the 90 min required by the conventional measurement ***,the NSS measurement method allows the measurement system to give rapid(within approximately 15 min)warning when the activity concentrations of some radionuclides reach their respective limits stipulated in the Guidelines for Drinking-water Quality of the WHO,suggesting that this method con

关键词： Water radioactivity monitoring Dynamic detection efficiency Rapid warning Activity estimation

Research on SFLA-Based Bidirectional Coordinated Control Strategy for EV Battery Swapping Station

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Computers, Materials & Continua 2017年第4期53卷 343-356页

作者： guo Zhao Jiang guo Hao qiang Key Laboratory of Hydraulic Machinery Transients(Wuhan University) Ministry of EducationyWuhan 430072China School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China School of Urban Rail Transit Changzhou UniversityChangzhou 213164China

As a good measure to tackle the challenges from energy shortages and environmental pollution,Electric Vehicles(EVs)have entered a period of rapid *** swapping station is a very important way of energy supply to EVs,and it is urgently needed to explore a coordinated control strategy to effectively smooth the load fluctuation in order to adopt the large-scale *** bidirectional power flow between the station and power grid,this paper proposed a SFLA-based control strategy to smooth the load ***,compared simulations were performed according to the related *** to particle swarm optimization(PSO)method,the presented SFLA-based strategy can effectively lower the peak-valley difference with the faster convergence rate and higher convergence *** is important for the swapping station that energy exchanging mode can supply energy for large-scale EVs with a smoother load profile than one-way charging mode.

关键词： SFLA bidirectional coordinated control battery swapping station optimization

Analytical modeling of geometric errors induced by cutter runout and tool path optimization for five-axis flank machining

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Science China(Technological Sciences) 2011年第12期54卷 3180-3190页

作者： guo qiang SUN YuWen guo DongMing Key Laboratory for Precision and Non-Traditional Machining Technology of the Ministry of Education Dalian University of Technology Dalian 116024 China

The cutter runout effect has significant influence on the shape of cutter swept surface and the machining surface quality. Hence,it is necessary to integrate the cutter runout effect in cutter swept surface modeling,geometric error prediction and tool path optimization for five-axis flank machining. In this paper,an envelope surface model considering cutter runout effect is first established,and geometric errors induced by runout effect are derived based on the relative motion analysis between the cutter and part in machining. In the model,the cutter runout is defined by four parameters,including inclination angle,location angle,offset value and the length of cutter axis. Then the runout parameters are integrated into the rotation surface of each cutting edge that is used to form the final cutter envelope surface for the five-axis machining process. Thus,the final resulting geometric errors of the machined surface induced by cutter runout can be obtained through computing the deviations from the nominal cutter swept surface. To reduce these errors,an iterative least square method is used to optimize the tool paths for five-axis flank machining. Finally,a validation example is given for a specific ruled surface. Results show the effectiveness and feasibility of the analytical model of geometric errors induced by cutter runout,and also show that the geometric errors can be reduced significantly using the proposed tool path planning method.

关键词： cutter runout tool path optimization envelope surface five-axis machining geometric errors

A New Synthesis Method and GABA Transporters Inhibitory Activities of Tiagabine and Its Analogues

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Chemical Research in Chinese Universities 2006年第3期22卷 351-355页

作者： ZHANG Jian-ge JIANG Chang-sheng ZHENG Jian-bin WEN Ren lin guo-qiang Department of Medicinal Chemistry School of Pharmacy Fudan University Shanghai 200032 P. R. China Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 201203 P. R. China

A new synthetic method and GABA transporter inhibitory activities of Tiagabine and its analogues are described. The key intermediates 4-tosyl-1,1-diaryl/heteroaryl-l-butene 10a-10e were synthesized by Wittig reaction, and followed by N-alkylation with （R）-3-piperidinecarboxylate. The resulting N-diheterocyclylalkenylpiperidine-3-carboxylic acid ester 11a-11e were saponified and then acidified *** the target compounds 1a-1e. The preliminary bioassays show that compound 1a-1e exhibited excellent inhibition of [ 3H ]-GABA uptake in vitro of culture ceils.

关键词： Tiagabine Analogue Synthesis GABA transporter inhibitor

Horizontal Mergers between Asymmetric Low-Carbon Manufacturers

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Journal of Systems Science and Systems Engineering 2022年第5期31卷 619-647页

作者： Xiaogang lin Kangning Jin Wenhui Fu qiang lin School of Management Guangdong University of Technology Guangzhou 510520China School of Economics and Management South China Normal UniversityGuangzhou 510006China

Mergers have become an important means for low-carbon manufacturers to improve their efficiency and *** paper studies the impact of horizontal mergers between asymmetric low-carbon manufacturers on product diversity,profits,consumer surplus,and the *** the premerger model,we consider two asymmetric manufacturers in terms of market potential that produce two products and compete on prices and carbon *** the postmerger model,the two asymmetric manufacturers merge into one *** merged manufacturer can either continue to produce two products and collude on both products'prices and carbon emissions or enjoy both production and green technology investment cost savings to produce only one *** result suggests that when the merged manufacturer produces two products,the merger does not necessarily lead to higher prices,which stands in sharp contrast to the conventional ***,the merger always benefits the manufacturer but harms *** the merged manufacturer chooses to produce only one product,however,we confirm that the merger can lead to a win-win-win outcome,i.e.,the manufacturer,customers,and environment all become better off if either the production or investment savings are *** conventional wisdom shows that salient costing savings lead to price ***,we show that the merged manufacturer can charge consumers higher prices to provide lower-emission *** addition,we show that improving investment(production)cost savings is more effective for the merged manufacturer if these two cost savings are salient(not salient).Finally,the merged manufacturer should not reduce diversity if these two cost savings are relatively low because the profit and consumer surplus may be simultaneously *** also extend our base model to the case where there exist three manufacturers in the premerger model and the merged firm still operates in a competitive market.

关键词： Game theory asymmetric horizontal merger low-carbon manufacturing price and emission collusions productionand investmentcost synergies