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Laser 728 nm Spectroscopy of Electrodeless Discharge Rb Lamp

Chinese Physics Letters 2014年第12期31卷 23-26页

作者：刘忠征薛潇博牛富增张理国凌俐陈景标 State Key Laboratory of Advanced Optical Communication System and Network Institute of Quantum Electronics School of Electronics Engineering ~ Computer Science Peking University Beijing 100871 Institute of Information and Electronics Zhejiang University City College Hangzhou 310015

The electrodeless discharge rubidium vapor lamp plays a key role in a number of applications, such as atomic clock, atomic magnetometer, atomic optical filter and laser frequency stabilization. The electrodeless discharge Rb vapor lamp has rich spectra, including 420nm, 421nm, 565nm, 572nm, 607nm, 616nm, 728 nm, 776 nm, 780 nm, 795 nm, 1324 nm, 1344 nm, 1366 nm, 1475 nm, 1529 nm spectroscopy, etc. The 780nm transition wavelength between 5P3/2 and 5S1/2 of Rb atoms is usually used in fields of the Rb atomic clock and the Rb atomic *** the 421.7 nm laser pumping atoms from 5S1/2 to 6P1/2, 1366.9 nm transition from 6S1/2 to 5P3/2 can be used as a clock transition of Rb four levels for an atomic active optical clock. An active optical clock is a new conception of the atomic clock and has the potential to improve the stabil- ity of the best atomic clocks by about two orders of magnitude. Another application of the elec- trodeless discharge Rb vapor lamp is the Rb Faraday anomalous-dispersion optical filter （FADOF）（e.g., 776 nm] and 1529 nm spectroscopy）, in which the electrodeless discharge Rb vapor lamp is more feasible than the one using a laser pumped Rb vapor cell in some cases, since many excited states are populated enough for aimed FADOF transition. Although the rich spectra of Rb have many applications, so far no detailed investigations or applications have been achieved in 728.0nm transition. To the best of our knowledge, the Rb 728.0 nm spectral data are currently only from the fluorescence by Beacham arc spectrum of rubidium early in 1959.

关键词： LASER spectroscopy INDUCTION lamps RUBIDIUM ABSORPTION spectra LASER cooling PHASE transformations (Physics)

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Stacking, Strain-engineering Induced Altermagnetism, Multipiezo Effect, and Topological State in Two-Dimensional Materials

arXiv

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arXiv 2025年

作者： Xun, Wei Liu, Xin Zhang, Youdong Wu, Yin-Zhong Li, Ping Jiangsu Engineering Research Center for Design and Application of Intelligent Detection Equipment School of Electronic Engineering Jiangsu Vocational College of Electronics and Information Huaian223003 China School of Physical Science and Technology Suzhou University of Science and Technology Suzhou215009 China State Key Laboratory for Mechanical Behavior of Materials Center for Spintronics and Quantum System School of Materials Science and Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China State Key Laboratory for Surface Physics Department of Physics Fudan University Shanghai200433 China State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang University Hangzhou310027 China

Altermagnetism, as a newly identified form of unconventional antiferromagnetism, enables the removal of spin degeneracy in the absence of net magnetization that provides a platform for the low power consumption and ultra-fast device applications. However, the rare attention has been paid to the relationship between stacking, strain and altermagnet, multipiezo effect and topological state. Here, we propose a mechanism to realize the altermagnet, multipiezo effect, and topological state in two-dimensional materials by the stacking and strain engineering. Based on the analysis of symmetry, we find that the spin splitting feature related to the Ut, PTt, MzUt, or MzPTt symmetries in altermagnet multilayers. In addition, we find that the stacking engineering can effectively realize the transform from antiferromagnetism to altermagnetism and semiconductor to metal for the Jauns bilayer V2SeTeO. More interestingly, the strain not only induces an intriguing multipiezo effect, encompassing the piezovalley, piezomagnetism and piezoelectric, but also achieves the abundant topological phase. Our findings offer a generalized direction for manipulating the spin splitting, valley polarization, and topological states, promoting practical application of valleytronic and spintronic devices based on two-dimensional altermagnets. © 2025, CC BY.

关键词： Antiferromagnetism

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Measurement of hysteresis loop on soft magnetic materials using lock-in amplifier

Measurement of hysteresis loop on soft magnetic materials us...

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作者： Shirane, Takashi Ito, Misato Advanced Course of Information and Electronic System Engineering Sendai National College of Technology Sendai 989-3128 Japan

A new method is proposed to measure the magnetic hysteresis as a function of temperature. It is based on the spectral decomposition of magnetization and measurement of different harmonics using the harmonic-detection function of a lock-in amplifier. Applying this method, a measuring system of the BH loop was designed and fabricated. This system gives spectra of magnetic flux density B driven by an ac-magnetic field h. The BH loops are reconstructed from the spectra of the B. The spectra and BH loops were measured for a NiZn ferrite toroid at various temperatures. When the temperature increases from the room temperature, the higher harmonics of the spectra increase. Approaching the Curie temperature T\C from below, magnetic loss and nonlinearity of the BH loops increase, and the loop shows the saturation just below T\C. © 2006 IEEE.

关键词： Magnetic materials

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Adaptive iterative learning control for a class of iteration-varying nonlinear systems with known periodicity

Adaptive iterative learning control for a class of iteration...

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2009 International Conference on Test and Measurement, ICTM 2009

作者： Chenkun, Yin Zhongsheng, Hou Advanced Control System Lab School of Electronics and Information Engineering Beijing Jiaotong University Beijing China

ISBN: (纸本)9781424447008

In this paper, a class of iteration-varying nonlinear system to track a non-repetitive desired trajectory is addressed using a new adaptive iterative learning control. The iteration-variance in parameter is described by a special kind of periodicity in iteration domain. The convergent result is elaborately proven using composite energy function. © 2009 IEEE.

关键词： Nonlinear systems

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Design and implementation of GPS RTK positioning using carrier phase measurement on an embedded board

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IEIE Transactions on Smart Processing and Computing 2020年第6期9卷 477-484页

作者： Khanal, Jhabindra Vista, Felipe Patino Chul, Kim Young Chong, Kil To Department of Electronics and Information Engineering Jeonbuk National University Jeonju54896 Korea Republic of School of Mechanical System Engineering Kunsan National University Gunsan54150 Korea Republic of Advanced Electronics and Information Research Center Jeonbuk National University Jeonju54896 Korea Republic of

The Global Positioning system (GPS) is currently used in many geodetic applications to obtain precise positions within a centimeter, or even within a millimeter. Generally, such a level of accuracy can be obtained by performing complex processing on expensive receivers and antennas. Such high-cost devices can be replaced by low-cost, single-frequency GPS receivers to obtain precise positions. To do so, in this paper, Carrier Phase (CP)-based relative algorithms are successfully implemented on a CUDA-enabled embedded board (the Jetson TK1) with two low-cost GNNS receivers. A CUDA-enabled graphics processing unit (GPU) is a highly parallel structure that makes efficient and faster CP-based algorithms and that can process large blocks of data in parallel. Our results from field measurements clearly show that the positioning performance of a Rover with respect to the Base receiver reached the centimeter level. Therefore, this work shows the possibility of accurately estimating the position of a receiver using low-cost hardware-based RTK algorithms. Copyrights © 2020 The Institute of electronics and information Engineers

关键词： Global positioning system

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Assessment of storage reliability for accelerometer based on pseudo-stable data

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2012 International Conference on Electrical and electronics engineering, ICEE 2012

作者： Jia, Dongyao Ai, Yanke Advanced Control System Laboratory School of Electronics and Information Engineering Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781461449805

Because of the slow parameter drifting and the long testing time in storage environment, the life test has failed to meet the actual needs in normal environment, so it is difficult to assess the reliability of the product accurately. The power function degradation model and the Arrhenius acceleration model are introduced in the paper based on the degradation mechanism of accelerometer parameters, and a generalized analysis method of high reliable and long life is also proposed under the pseudo-stable condition obeying the log-normal distribution and the Weibull distribution. The experiments proved that the proposed method can overcome the disadvantage in reliability assessment for traditional accelerated data, eliminate the defect of the accelerometer reliability interval evaluation, and improve the accuracy and stability of the reliability index, so it has higher cost-effectiveness ratio. © 2014 Springer Science+Business Media New York.

关键词： Accelerometers

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A Default Prediction Model in Installment Sales Using Non Financial Data 9

A Default Prediction Model in Installment Sales Using Non Fi...

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9th International Congress on advanced Applied Informatics, IIAI-AAI 2020

作者： Ijiri, Moe Tabata, Tomoaki Hosoda, Takaaki Tokai University School of Information and Telecommunication Engineering Course of Information Telecommunication Engineering Tokyo Japan Tokai University School of Info Rmation and Telecommunication Engineering Department of Management System Engineering Tokyo Japan Advanced Institute of Industrial Technology Information Systems Architecture Tokyo Japan

ISBN: (纸本)9781728173979

In recent years, a credit scoring service that based on personal behavioral data has been providing in the world. Alibaba Group's Ant Financial in China developed Sesame Credit and launched its service in 2015 as an additional function of Alipay. Credit score(risk) is mainly used in case of calculating loan limit and loan interest rate. On the other hand, a personal credit score affects not only loans but also to benefit public services, job hunting, and marriage hunting. In many countries, personal credit scores will be created as part of various services and become credit score society as in China. Personal credit scores have been already performed practically, but there is not so much research on academic at present. In particular, there is not research on the personal credit risk using only non-financial data without financial data. Generally, financial data is used principally to measure a company's credit risk. However, the use of financial data to measure a personal credit risk is considered dangerous. Therefore, in the latter case, it's important to calculate credit risk using only non-financial data without using financial data. In this study, we examine the method to calculate personal credit score using non-financial ***, we describe the flow of a customer who purchases a product using relation diagram until it defaults. Secondly, we performed a two-group discriminant analysis using the default variable as the objective variable and adding some default factors to the explanatory variables. As a result of the correct discrimination rate, discrimination was possible, albeit slightly. In addition, it turned out to be meaningful to analyze personal credit using only non-financial data. © 2020 IEEE.

关键词： Discriminant analysis

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Proper encoding for snapshot-entropy scaling in two-dimensional classical spin models

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Physical Review E 2015年第4期92卷 042167-042167页

作者： Hiroaki Matsueda Dai Ozaki Advanced Course of Information and Electronic System Engineering Sendai National College of Technology Sendai 989-3128 Japan

We reexamine the snapshot entropy of the Ising and three-states Potts models on the L×L square lattice. Focusing on how to encode the spin snapshot, we find that the entropy at Tc scales asymptotically as S∼(1/3)lnL that strongly reminds us of the entanglement entropy in one-dimensional quantum critical systems. This finding seems to support that the snapshot entropy after the proper encoding is related to the holographic entanglement entropy. On the other hand, the anomalous scaling Sχ∼χηlnχ for the coarse-grained snapshot entropy holds even for the proper encoding. These features originate in the fact that the largest singular value of the snapshot matrix is regulated by the proper encoding.

关键词： ENTROPY MATHEMATICAL models SPIN Hall effect POTTS model LATTICE theory HOLOGRAPHY

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Switched capacitor D-A converters with a dual reference input addition method

Switched capacitor D-A converters with a dual reference inpu...

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2013 52nd Annual Conference of the Society of Instrument and Control Engineers of Japan, SICE 2013

作者： Nakamura, Shoutarou Wakaumi, Hiroo Advanced Course Tokyo Metropolitan College of Industrial Technology Tokyo Japan Division of Electronics and Information Engineering Tokyo Metropolitan College of Industrial Technology Tokyo Japan

An even number bits version and whole number bits one of CMOS switched capacitor 8-bit D-A converters using a dual reference input addition method are proposed to realize a miniature chip area and high-speed video band operation. These circuits which provide two reference voltages at upper and lower bits, enable themselves to use common capacitors at upper and lower bits, reducing total capacitances. As a result of simulation for the performance of these 8-bit D-A converters using SPICE, the inaccuracy of the even bits version circuit was less than the resolution of 8-bit conversion. The inaccuracy of the whole bits version circuit was also decreased to less than the resolution of 8-bit D-A converter by decreasing the adder gain. Total capacitances providing the occupation area of these circuits decreased to nearly 20 %ù10 % of that in the conventional switched capacitor 8-bit D-A converter.

关键词： Video signal processing

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Geometry-Based Channel Modeling for Bistatic Integrated Sensing and Communication Vehicular Networks

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IEEE Communications Letters 2025年

作者： Jin, Yunwei He, Ruisi Ai, Bo Yuan, Yuan Zhang, Haoxiang Liu, Bincheng Beijing Jiaotong University State Key Laboratory of Advanced Rail Autonomous Operation the School of Electronics and Information Engineering the Frontiers Science Center for Smart High-speed Railway System Beijing100044 China Ministry of Industry and Information Technology China Academy of Industrial Internet Beijing100804 China Chinese Academy of Sciences Aerospace Information Research Institute Beijing100094 China

Integrated Sensing and Communication (ISAC) has recently attracted significant attention. Vehicular networks (VNs) require communication links to effectively leverage dynamic information of surrounding vehicles. This necessity renders ISAC particularly suitable for vehicular applications, as it simultaneously provides robust communication and high-precision sensing capabilities. In this letter, we investigate channel modeling for bistatic ISAC in VNs, where the multi-functional vehicular transmitter is designed to communicate with the receiver while operating in a bistatic configuration with the sensing unit. To enhance generality of the model, we use an elliptical geometry structure to describe scatterers distribution, and derive channel impulse response for both the communication and sensing channels. The proposed model can be adapted to various bistatic sensing scenarios by adjusting the parameters. Subsequently, we analyze space-time-frequency correlation function. Numerical results indicate that the sensing channel has longer coherence time, while it exhibits greater sensitivity to variations in terminal velocity. © 1997-2012 IEEE.

关键词： Geometry

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