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This paper introduces the formation of a physical real-time time scale using data of remote clocks from different time laboratories in Beijing region linked via fiber-based high-precision frequency transfer network.
We present the experimental demonstration of quantum Hamiltonian learning. Using an integrated silicon-photonics quantum simulator with the classical machine learning technique, we successfully learn the Hamiltonian dynamics of a diamond nitrogen-vacancy center's electron ground-state spin.
We report progress of the self-sustaining magnetometer. The sensitivity follows a faster τ−1 rule rather than τ−1/2 rule with time, and it can be close to the shot noise limit in a much shorter time.
The response of current-voltage characteristics of the photo memory cell with quantum dot and quantum well are presented. It has good low-light-level sensitivity and very small dark current at low temperature. In order to explore its high sensitive application because of high internal photoconductor gain, the CMOS readout circuits and correlated double sample structure are integrated to acquire small...
This paper presents the application of reflective gratings as polarizers for electron cyclotron heating system in magnetic confinement fusion fields. Two methods, the integral method and the coordinate transformation method, are introduced for the grating design. Codes based on the two methods are developed. Numerical results of the integral method and the coordinate transformation method agree well...
This paper presents a circular polarization converter based on an array of planar helices, which can effectively reject the left-hand circularly polarized (LCP) incident wave, while convert the right-hand circularly polarized (RCP) incident wave into an outgoing LCP wave. The proposed converter features a broad operation bandwidth with high rejection for LCP incident wave and high conversion coefficient...
This paper presents the modeling and control of a nonlinear two-wheeled inverted pendulum (TWIP) system. We derive the transfer function and design robust controllers for the TWIP system. The designed controllers are implemented on MATLAB/Simulink and on a microcontroller for simulations and experiments, respectively. It is found that the single-loop feedback control structure cannot deal with the...
A noninvasive measurement of in situ acoustic intensity is useful in a variety of therapeutic applications such as ultrasound induced drug and gene delivery. Some previously proposed methods assumed other acoustic parameters such as scattering coefficient to be constant. This paper proposed a method free of such restrictions, by estimating all the relevant parameters using the highly nonlinear behaviors...
Exploitation and using of clean and renewable energy to improve the domestic energy structure is important for building smart city. Photovoltaic (PV) power generation is a good choose, and modules inspection is an important direction of PV power generation. The manual inspection is a common way but is not feasible for large-scale PV systems in practice due to low efficiency, high error rate and long...
Ultrasound had been reported to locate the actual in situ focal spot of FUS and to compensate for guidance error due to beam distortion. However it still cannot determine exposure dosage in a clinical setting, therefore monitoring often require MR thermography. The main challenge is that multiple relevant acoustic parameters are not easily isolated from measurable signal characteristics in noninvasive...
To miniature RLG, the path length limit for navigation grade performance is estimated, and dither frequency and amplitude is increased to improve random walk coefficient; dither motor is optimized to obtain minimum size and good vibration performance; a structural, piezoelectric coupled finite element model for path length control (PLC) transducer is established, to increase the compensation ability...
Several high-voltage silicon carbide (SiC) devices have been demonstrated over the past few years, and the latest-generation devices are showing even faster switching, and greater current densities. However, there are no commercial gate drivers that are suitable for these high-voltage, high-speed devices. Consequently, there has been a great research effort into the development of gate drivers for...
With the rapid development of the Internet, people are not satisfied with sharing information only on the local network; instead, they intend to maximize the use of various types of network resources in different regions in the world. Intelligent network increasingly strong demand, put forward new demands on intelligent routing protocol. Intelligent routing protocol model not only need to have self...
Laparoscopic pelvic lymph node dissection is a delicate operation because pelvic arteries, which should be located first to guide the dissection, are often concealed by tissues and cannot be identified in the endoscopic view. Consequently, arteries can be damaged if they are not located accurately. To improve dissection safety and efficiency, we have developed an image-guided navigation system to...
We show that a mobile phone can measure hemoglobin levels using the built-in RGB camera and white LED without modification. Prior work has demonstrated that a smartphone using the built-in RGB camera with the aid of visible and IR lights can achieve a Pearson correlation results between 0.69–0.82 and an RMSE value between 1.26–1.56 g/dL. Our system builds upon the prior work and demonstrates that...
Contamination and Electrical Overstress are typical failure modes that may appear in failed devices. However, the clean exposure and excellent preservation of such failure sites is often found challenging or even impossible due to the limitations of the decapsulation techniques and tools available. The accuracy of failure analysis can be jeopardized during decapsulation due to the introduction of...
Raman lasers with a frequency difference equal to the hyperfine splitting of ground state have been widely used in quantum precision measurements. In this paper, we report a hybrid Raman lasers system combined with the optical injection and optical phase-lock loop. This design not only offers us the convenience to independently adjust the intensity and polarization of Raman lasers, but also suppress...
A microwave atomic clock based on 113Cd+ ions at Tsinghua University is carried out for seven years. To further improve the performance of the clock, a new experimental setup with dual traps and dual species ions was proposed. To investigate the efficiency of sympathetic cooling and the dynamic process of ions, numerical simulation study of the dual-species ion ensembles by the Molecular-dynamics...
Quantum Phase Estimation (PE) is a fundamental building block in the framework of Quantum Computing. Accurate estimation of the true eigenphase φ0 of a known eigenstate |φ〉 is fundamental for the implementation of many promising quantum algorithms. The interest in PE is also due to the modest quantum hardware requirements of the Iterative Phase Estimation Algorithm (IPEA) implementation [1], successfully...
Ge n- and p-FinFETs with different interfacial layer ferroelectric HfZrOx (IL-FE-HZO) gate stacks have been demonstrated systematically by various annealing conditions for the first time. Microwave annealing (MWA) not only shows enhanced FE characteristics but also suppresses the gate leakage and Ge interdiffusion compared with conventional rapid thermal annealing (RTA). While HZO on Al2O3 IL results...
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