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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： Qian Dong Salar Sajedi Ke Cui Craig S. Levin Departments of Electrical Engineering and Radiology Stanford University Stanford CA USA Departments of Radiology Stanford University Stanford CA USA Department of Radiology Electrical Engineering Bioengineering and Physics Stanford University Molecular Imaging Program at Stanford (MIPS) Stanford CA USA

With advanced PET system development, processing a high number of channels online is necessary and critical, especially for applications with one-to-one coupled crystals and silicon photomultipliers (SiPMs). We are developing an RF-penetrable TOF-PET brain dedicated insert with lutetiumyttrium oxyorthosilicate (LYSO) crystals one-to-one coupled to SiPMs. There are 768 crystal-SiPM channels per detector module, and a PET insert ring comprises 16 detector modules. A compact design to process 12288 channels with a designed 20 kcps singles count rate per channel in real-time is challenging. In this paper, we developed an FPGA-based data acquisition (DAQ) system using a commercial evaluation board and characterized its performance with two full detector modules; each having 768 crystal-SiPM channels. We achieved a global energy resolution of 11.46 ± 0.02% FWHM and a global coincidence time resolution of 224.47 ± 0.15ps FWHM over 1536 SiPM-crystal channels with DAQ online processing. All parameters including global energy resolution, global CTR, coincidence count rate, and random count rate changed less than 3% between offline processing and online DAQ processing.

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Nanoscale application and measurement of high force using DNA Origami nanocalipers 17

Nanoscale application and measurement of high force using DN...

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17th Annual Conference on Foundations of Nanoscience: Self-Assembled Architectures and Devices, FNANO 2020

作者： Darcy, Michael Wang, Yuchen Crocker, Kyle Le, Jenny Bundschuh, Ralf Castro, Carlos Poirier, Michael Department of Physics United States Department of Mechanical and Aerospace Engineering United States Biophysics Graduate Program Ohio State University United States

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Characterizations of Second-order Nonlinear Optical Susceptibility for ϵ-phase Gallium Oxide

Characterizations of Second-order Nonlinear Optical Suscepti...

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2022 Compound Semiconductor Week, CSW 2022

作者： Zhou, Jingan Zhao, Xuan Xu, Rui Fu, Kai Li, Tao Xu, Mingfei He, Ziyi Robinson, Jacob T. Zhu, Hanyu Zhang, Xiaodong Zhao, Yuji Rice University Department of Electrical and Computer Engineering HoustonTX77005 United States Rice University Smalley-Curl Institute Applied Physics Graduate Program HoustonTX77005 United States Rice University Department of Materials Science and NanoEngineering HoustonTX77005 United States Arizona State University School of Electrical Computer and Energy Engineering TempeAZ85287 United States Suzhou Institute of Nano-tech and Nano-bionics CAS Key Laboratory of Nanodevices and Applications Suzhou215123 China

ISBN: (数字)9781665453400

ISBN: (纸本)9781665453400

In this work, we report the second-order nonlinear optical susceptibility χ(2) for epsilon phase Gallium Oxide (ϵ-Ga2O3) thin film on sapphire. ϵ-Ga2O3 exhibits hexagonal P63mc space group symmetry, which is a non-centrosymmetric structure with non-zero second order susceptibility. By focusing a pulsed laser beam on to a polished ϵ-Ga2O3 thin film, we collected the generated second harmonic photons with an ultra-sensitive femtowatt photodetector, obtaining effective second-order nonlinear optical susceptibility of χ(2) = 4.89×10-3 pm/V at wavelength of 800 nm. Two different measurement systems collecting reflected and transmitted photons were applied separately to make the result more convincing. The wavelength dependence from 790 nm to 900 nm and polarization dependence from TM mode to TE mode were measured as well. These results will be helpful for the design and fabrication of Ga2O3 based integrated photonics platform in the infrared-visible spectral range. © 2022 IEEE.

关键词： Gallium compounds

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Prototype of Portable Robusta Coffee Harvesting Machine 21

Prototype of Portable Robusta Coffee Harvesting Machine

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Proceedings of the 7th International Conference on Robotics and Artificial Intelligence

作者： Nuttapong Ruttanadech Thatchapol Chungcharoen Sansanee Sansiribhan Ronnachart Munsin Ratiya Thuwapanichayanan Arkom Palamanit Warunee Limmun Engineering King Mongkut's Institute of Technology Ladkrabang Prince of Chumphon Campus Thailand Applied Physics Program Suan Sunandha Rajabhat University Thailand Mechanical Engineering Rajamangala University of Technology Lanna Thailand Farm Mechanics Kasetsart University Thailand Specialized Engineering Prince of Songkla University Thailand

ISBN: (纸本)9781450385855

The limitations of machine size and cost are main problems for coffee harvesting using machine picking. Therefore, the prototype of Robusta coffee harvesting machine with portable and low cost was designed and created in this research. Moreover, the effects of bristle hardness, bristle size and brush rotation speed on the coffee harvesting efficiency were investigated. The experimental results showed that the prototype of portable Robusta coffee harvesting machine was effective to harvest the Robusta coffee. It provided the highest coffee harvesting efficiency of 75.24% by using the bristle hardness of 75 shore A, bristle size of 8 mm and brush rotation speed of 700 rpm. The bristle hardness, bristle size and brush rotation speed were significantly affected the coffee harvesting efficiency. The coffee harvesting efficiency was increased when increasing the bristle hardness from 60 shore A to 75 shore A and the brush rotation speed from 600 rpm to 700 rpm. On the other hand, the increase of bristle size from 8 mm to 10 mm provided the lower coffee harvesting efficiency.

关键词： Brush rotation speed Coffee harvesting efficiency Bristle hardness Bristle size

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Physical Considerations for Cherenkov Radiation Based Coincidence Time Resolution Measurements in BGO

Physical Considerations for Cherenkov Radiation Based Coinci...

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2021 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2021

作者： Gonzalez-Montoro, Andrea Pourashraf, Shirin Cates, Joshua W. Merzi, Stefano Gola, Alberto Borghi, Giacomo Levin, Craig S. Stanford University Department of Radiology StanfordCA94305 United States Lawrence Berkeley National Laboratory Applied Nuclear Physics BerkeleyCA94720 United States Fondazione Bruno Kessler TrentoI-38123 Italy Stanford University Depts. of Radiology Molecular Imaging Program Bioengineering Physics and Electrical Engineering CA94305 United States

ISBN: (纸本)9781665421133

Exploiting the Cherenkov luminescence from 511 keV photoelectric interactions is a potential solution to re-introduce BGO scintillators in time-of-flight positron emission tomography (TOF-PET). Recent improvements in vacuum- and near- ultra-violet high density (VUV- and NUV-HD) silicon photomultiplier (SiPM) technology combined with efficient data post-processing methods, make it possible to access timing information from the relatively few Cherenkov photons emitted. To achieve good coincidence time resolution (CTR) also requires low noise and fast readout electronics with small effective capacitance, which is possible by employing bootstrapping *** this summary, we report the CTR evaluation of the new VUV-HD and NUV-HD enhanced SiPMs. Results using a (i) standard electronic board, and a (ii) custom designed board for timing measurements, are shown. After applying state-of-the-art correction methods, values below 400 ps CTR FWHM have been reported for 3×3 mm2 BGO crystals with lengths ranging from 3 to 15 mm, thus indicating the excellent performance of new SiPM technology combined with our custom design board. © 2021 IEEE.

关键词： Data handling

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Correction: Polyaniline nanorods dotted on graphene oxide nanosheets as a novel super adsorbent for Cr(VI)

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Dalton transactions (Cambridge, England : 2003) 2022年第1期52卷 2022 Dec 8页

作者： Shouwei Zhang Meiyi Zeng Wenqing Xu Jiaxing Li Jie Li Jinzhang Xu Xiangke Wang Key Laboratory of Novel Thin Film Solar Cells Institute of Plasma Physics Chinese Academy of Sciences 230031 Hefei PR China. lijx@***. School of Materials Science and Engineering Hefei University of Technology Hefei 230031 China. Department of Chemical Engineering Environmental Engineering Program Yale University New Haven Connecticut 06520 USA.

Correction for 'Polyaniline nanorods dotted on graphene oxide nanosheets as a novel super adsorbent for Cr(VI)' by Shouwei Zhang , , 2013, , 7854-7858, https://***/10.1039/C3DT50149C.

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On Max Pressure Urban Traffic Control with Learning

On Max Pressure Urban Traffic Control with Learning

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Information Technology International Seminar (ITIS)

作者： Adiyana Putri Endra Joelianto Herman Y Sutarto Faculty of Industrial technology Institut Teknologi Bandung Doctoral Program of Engineering Physics Bandung Indonesia Faculty of Industrial Technology Institut Teknologi Bandung Instrumentation and Control Research Group Bandung Indonesia Department of Intelligent System PT. Pusat Riset Energi (PRE) Bandung Indonesia

Managing the traffic system is a multifaceted challenge, imposing various solutions to prevent congestion. Traffic management aims to create an efficient control system with numerous advantages, including reduced fuel emissions, lower stress levels, and enhanced driving discipline. Max Pressure stands as one of the techniques for traffic control, designed to adapt and enhance network throughput by considering pressure, defined as the difference between upstream and downstream queue lengths. Recent developments have yielded improved performance in Max Pressure through learning. In this adaptive control mechanism, the concept of Max Pressure is integrated as a reward function within reinforcement learning. This study introduces the “Max Pressure learning” concept, revealing its potential for creating adaptable traffic controllers. By modifying the pressure equation and transforming it into a performance metric, the original Max Pressure concept effectively responds to diverse traffic conditions. This paper showcases research findings demonstrating the surprising effectiveness of pressure as a control mechanism in the context of the learning process. Ultimately, using pressure enables controllers to efficiently alleviate gridlock situations in traffic, highlighting its promising role in optimizing traffic management and enhancing overall traffic system performance.

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Cavity-coupled telecom atomic source in silicon

arXiv

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arXiv 2023年

作者： Johnston, Adam Felix-Rendon, Ulises Wong, Yu-En Chen, Songtao Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States

Atomic defects in solid-state materials are promising candidates for quantum interconnect and networking applications. Recently, a series of atomic defects have been identified in the silicon platform, where scalable device integration can be enabled by mature silicon photonics and electronics technologies. In particular, T centers hold great promise due to their telecom band optical transitions and the doublet ground state electronic spin manifold with long coherence times. However, an open challenge for advancing the T center platform is to enhance its weak and slow zero phonon line emission. In this work, we demonstrate the cavity-enhanced fluorescence emission from a single T center. This is realized by integrating single T centers with a low-loss, small mode-volume silicon photonic crystal cavity, which results in an enhancement of the fluorescence decay rate by a factor of F = 6.89. Efficient photon extraction enables the system to achieve an average photon outcoupling rate of 73.3 kHz at the zero phonon line. The dynamics of the coupled system is well modeled by solving the Lindblad master equation. These results represent a significant step towards building efficient T center spin-photon interfaces for quantum information processing and networking applications. © 2023, CC BY.

关键词： Silicon photonics

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Structural Properties of Hyperuniform Networks

arXiv

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arXiv 2024年

作者： Newby, Eli Shi, Wenlong Jiao, Yang Albert, Reka Torquato, Salvatore Department of Physics Pennsylvania State University University ParkPA16802 United States Materials Science and Engineering Arizona State University TempeAZ85287 United States Department of Physics Arizona State University TempeAZ85287 United States Department of Chemistry Princeton University PrincetonNJ08544 United States Department of Physics Princeton University PrincetonNJ08544 United States Princeton Institute of Materials Princeton University PrincetonNJ08544 United States Program in Applied and Computational Mathematics Princeton University PrincetonNJ08544 United States

Disordered hyperuniform many-particle systems are recently discovered exotic states of matter, characterized by a complete suppression of normalized infinite-wavelength density fluctuations, as in perfect crystals, and lack of conventional long-range order, as in liquids and glasses. In this work, we begin a program to quantify the structural properties of nonhyperuniform and hyperuniform networks. In particular, large two-dimensional (2D) Voronoi networks (graphs) containing approximately 10,000 nodes are created from a variety of different point configurations, including the antihyperuniform hyperplane intersection process (HIP), nonhyperuniform Poisson process, nonhyperuniform random sequential addition (RSA) saturated packing, and both non-stealthy and stealthy hyperuniform point processes. We carry out an extensive study of the Voronoi-cell area distribution of each of the networks through determining multiple metrics that characterize the distribution, including their higher-cumulants (i.e., skewness 1 and excess kurtosis 2). We show that the HIP distribution is far from Gaussian, as evidenced by a high skewness (γ1 = 3.16) and large positive excess kurtosis (γ2 = 16.2). The Poisson (with γ1 = 1.07 and γ2 = 1.79) and non-stealthy hyperuniform (with γ1 = 0.257 and γ2 = 0.0217) distributions are Gaussian-like distributions, since they exhibit a small but positive skewness and excess kurtosis. The RSA (with γ1 = 0.450 and γ2 = -0.0384) and the highest stealthy hyperuniform distributions (with γ1 = 0.0272 and γ2 = -0.0626) are also non-Gaussian because of their low skewness and negative excess kurtosis, which is diametrically opposite non-Gaussian behavior of the HIP. The fact that the cell-area distributions of large, finite-sized RSA and stealthy hyperuniform networks (e.g., with N ≈ 10, 000 nodes) are narrower, have larger peaks, and smaller tails than a Gaussian distribution implies that in the thermodynamic limit the distributions should exhibit compact suppo

关键词： Gaussian distribution

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Measuring 3D Chemistry at 1 nm Resolution with Fused Multi-Modal Electron Tomography

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1394-1395页

作者： Schwartz, Jonathan Di, Zichao Wendy Jiang, Yi Cho, Min Gee Qian, Yiwen Gu, Junsi Rozeveld, Steve Ercius, Peter Fessler, Jeffrey A. Xu, Ting Scott, Mary Hovden, Robert Department of Materials Science and Engineering University of Michigan Ann Arbor MI United States Mathematics and Computer Science Division Argonne National Laboratory Lemont IL United States Advanced Photon Source Argonne National Laboratory Lemont IL United States Department of Materials Science and Engineering University of California at Berkeley Berkeley CA United States National Center for Electron Microscopy Lawrence Berkeley National Laboratory Berkeley CA United States Dow Chemical Co. Midland MI United States Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI United States Materials Science Division Lawrence Berkeley National Laboratory Berkeley CA United States Applied Physics Program University of Michigan Ann Arbor MI United States

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