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arXiv 2019年

作者： Chen, Tzu-Yu Obermeier, Julian Schumacher, Thorsten Lin, Fan-Cheng Huang, Jer-Shing Lippitz, Markus Huang, Chen-Bin Institute of Photonics Technologies National Tsing Hua University Hsinchu30013 Taiwan International Intercollegiate PhD Program National Tsing Hua University Hsinchu30013 Taiwan Department of Physics University of Bayreuth Bayreuth95440 Germany Department of Chemistry National Tsing Hua University Hsinchu30013 Taiwan Leibniz Institute of Photonic Technology Jena07745 Germany Department of Electrophysics National Chiao Tung University Hsinchu30010 Taiwan Research Center for Applied Sciences Academia Sinica Taipei115-29 Taiwan

A new concept for second-harmonic generation (SHG) in an optical nanocircuit is proposed. We demonstrate both theoretically and experimentally that the symmetry of an optical mode alone is sufficient to allow SHG even in centro-symmetric structures made of centro-symmetric material. The concept is realized using a plasmonic two-wire transmission-line (TWTL), which simultaneously supports a symmetric and an anti-symmetric mode. We first confirm the generated second-harmonics belong only to the symmetric mode of the TWTL when fundamental excited modes are either purely symmetric or anti-symmetric. We further switch the emission into the anti-symmetric mode when a controlled mixture of the fundamental modes is excited simultaneously. Our results open up a new degree of freedom into the designs of nonlinear optical components, and should pave a new avenue towards multi-functional nanophotonic circuitry. Copyright © 2019, The Authors. All rights reserved.

关键词： Harmonic generation

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PROGNOSTIC ROLE OF LESION DISSEMINATION FEATURE (DMAX) CALCULATED ON BASELINE PET/CT IN HODGKIN LYMPHOMA

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Hematological Oncology 2021年第S2期39卷

作者： R Durmo A Ségolèn Cottereau L Rebaud C Nioche A Ruffini F Fioroni M Meignan I Buvat F Merli A Versari S Luminari University of Modena and Reggio Emilia PhD program in Clinical and Experimental Medicine (CEM) Modena Italy Cochin Hospital AP-HP University of Paris Department of Nuclear Medicine Paris France UMR 1288 Université Paris Saclay/Inserm/Institut Curie LITO laboratory Orsay France Grade Onlus Hematology Unit Reggio Emilia Italy AUSL-IRCCS of Reggio Emilia Medical Physics Reggio Emilia Italy Henri Mondor University Hospital AP-HP University Paris East Lusa Imaging Creteil France AUSL-IRCCS of Reggio Emilia Hematology Unit Reggio Emilia Italy AUSL-IRCCS of Reggio Emilia Nuclear Medicine Reggio Emilia Italy

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Chemically driven isothermal closed space vapor transport of MoO2: Thin films, flakes and in-situ tellurization

arXiv

引用

arXiv 2019年

作者： De Melo, O. García-Pelayo, L. González, Y. Concepción, O. Manso-Silván, M. López-Nebreda, R. Pau, J.L. González, J.C. Climent-Font, A. Torres-Costa, V. Departamento de Física Aplicada Instituto de Ciencia de Materiales Nicolás Cabrera Facultad de Ciencias Universidad Autónoma de Madrid Cantoblanco28049 Spain Physics Faculty University of Havana La Habana10400 Cuba Nanoscience and Nanotechnology PhD Program Cinvestav-IPN Mexico City07360 Mexico Departamento de Física Universidad Federal de Minas Gerais Belo HorizonteMG30123-970 Brazil Centro de Microanálisis de Materiales Universidad Autónoma de Madrid Madrid28049 Spain

A novel procedure, based in a closed space vapor transport (CSVT) configuration, has been devised to grow films or flakes of pure MoO2 in a reductive atmosphere, at relatively low temperature and using MoO3 as the source. In contrast with conventional CSVT technique, in the proposed method a temperature gradient is not required for the growth to take place, which occurs through an intermediate volatile transport species that is produced in the complex reduction reaction of MoO3. An added value of this simple method is the possibility of transforming the MoO2 into MoTe2, one of the most interesting members of the transition metal dichalcogenide family. This is achieved in a sequential process that includes the growth of Mo oxide and its (in-situ) tellurization in two consecutive steps. Copyright © 2019, The Authors. All rights reserved.

关键词： Transition metals

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Biologically inspired protection of deep networks from adversarial attacks

arXiv

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arXiv 2017年

作者： Nayebi, Aran Ganguli, Surya Neurosciences PhD Program Stanford University United States Department of Applied Physics Stanford University United States

Inspired by biophysical principles underlying nonlinear dendritic computation in neural circuits, we develop a scheme to train deep neural networks to make them robust to adversarial attacks. Our scheme generates highly nonlinear, saturated neural networks that achieve state of the art performance on gradient based adversarial examples on MNIST, despite never being exposed to adversarially chosen examples during training. Moreover, these networks exhibit unprecedented robustness to targeted, iterative schemes for generating adversarial examples, including second-order methods. We further identify principles governing how these networks achieve their robustness, drawing on methods from information geometry. We find these networks progressively create highly flat and compressed internal representations that are sensitive to very few input dimensions, while still solving the task. Moreover, they employ highly kurtotic weight distributions, also found in the brain, and we demonstrate how such kurtosis can protect even linear classifiers from adversarial attack. Copyright © 2017, The Authors. All rights reserved.

关键词： Deep neural networks

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Deep learning models of the retinal response to natural scenes

arXiv

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arXiv 2017年

作者： McIntosh, Lane T. Maheswaranathan, Niru Nayebi, Aran Ganguli, Surya Baccus, Stephen A. Neurosciences PhD Program Singapore Department of Applied Physics Singapore Neurobiology Department Stanford University United States

A central challenge in sensory neuroscience is to understand neural computations and circuit mechanisms that underlie the encoding of ethologically relevant, natural stimuli. In multilayered neural circuits, nonlinear processes such as synaptic transmission and spiking dynamics present a significant obstacle to the creation of accurate computational models of responses to natural stimuli. Here we demonstrate that deep convolutional neural networks (CNNs) capture retinal responses to natural scenes nearly to within the variability of a cell's response, and are markedly more accurate than linear-nonlinear (LN) models and Generalized Linear Models (GLMs). Moreover, we find two additional surprising properties of CNNs: they are less susceptible to overfitting than their LN counterparts when trained on small amounts of data, and generalize better when tested on stimuli drawn from a different distribution (e.g. between natural scenes and white noise). An examination of the learned CNNs reveals several properties. First, a richer set of feature maps is necessary for predicting the responses to natural scenes compared to white noise. Second, temporally precise responses to slowly varying inputs originate from feedforward inhibition, similar to known retinal mechanisms. Third, the injection of latent noise sources in intermediate layers enables our model to capture the sub-Poisson spiking variability observed in retinal ganglion cells. Fourth, augmenting our CNNs with recurrent lateral connections enables them to capture contrast adaptation as an emergent property of accurately describing retinal responses to natural scenes. These methods can be readily generalized to other sensory modalities and stimulus ensembles. Overall, this work demonstrates that CNNs not only accurately capture sensory circuit responses to natural scenes, but also can yield information about the circuit's internal structure and function. Copyright © 2017, The Authors. All rights reserved.

关键词： Ophthalmology

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Estimation of solar radiation using Angstrom-Prescott model and interpolation of empirical coefficients in Thailand

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Journal of physics: Conference Series 2018年第1期1144卷

作者： K Keawsang-in S Ratjiranukool P Ratjiranukool PhD's Degree Program in Applied Physics Faculty of Science Chiang Mai University Department of Physics and Materials Faculty of Science Chiang Mai University Department of Physics Faculty of Science and Technology Chiang Mai Rajabhat University

Angstrom-Prescott model, defined by , was applied to estimate solar L so J radiation for 11 meteorological stations in Thailand. In this research, the empirical coefficients ('a' and 'b') were calculated by using the least square model. Statistical values, i.e., root mean square error (RMSE) and correlation, were analyzed the model ability in estimating solar radiation by compared with the measurement. The empirical coefficients overall Thailand were interpolated by using geographic information system (GIS). This technique can be calculated for estimation of solar radiation in every region in Thailand. In the results, the statistical tests show the ability of Angstrom-Prescott model to estimate solar radiation in Thailand and the least square method is suitable for computing empirical coefficients.

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Circumbinary planet study around NSVS 14256825

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Journal of physics: Conference Series 2019年第1期1380卷

作者： P Sappankum S Komonjinda S Awiphan R Rattanamala V S Dhillon T R Marsh S Suphapolthaworn Master of Science Program in Astronomy Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand National Astronomical Research Institute of Thailand (Public Organization) 260 Moo 4 Donkaew Mae Rim Chiang Mai 50180 Thailand Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand PhD Program in Astronomy Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Department of Physics and General Science Faculty of Science and Technology Nakhon Ratchasima Rajabhat University Nakhon Ratchasima 30000 Thailand Department of Physics and Astronomy University of Sheffield Sheffield S3 7RH UK Department of Physics University of Warwick Coventry CV4 7AL UK Department of Physics School of Science Hokkaido University Sapporo Hokkaido 060-0808 Japan

The period variability of (O-C) diagram of an eclipsing binary, NSVS 14256825, which is composed of a hot subdwarf type OB star (sdOB) and a main-sequence low-mass type M star (dM) in close orbit with period P=0.110374 days, previously showed sinusoidal signal cause by the light travel time effects. This signal can be caused by the presence of third bodies. We re-examined (O-C) diagram of the system. We combined eclipse timings from published data and the data taken from ULTRASPEC at 2.4 m at Thai National Telescope on November 2018. From the fitting model, the parameters of the third body in NSVS 14256825 system are obtained.

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Electrical properties and microstructure of phase combination in BaTiO3-based Ceramics

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Journal of physics: Conference Series 2018年第1期1144卷

作者： N Funsueb A Limpichaipanit A Ngamjarurojana Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand PhD's Degree Program in Applied Physics Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand

Perovskite barium titanate (BaTiO3) ceramics are widely used in electronics industries such as capacitors, sensors and actuators. BaTiO3-based ceramics have good dielectric, ferroelectric and piezoelectric properties. BaTiO3 powder was fabricated by mixed-oxide method via a vibro-milling technique. The pellets were then placed in a high purity alumina crucible in air and sintered at 1375 °C for 1, 2, 4, 6 and 8h. X-ray diffraction technique was used to investigate phase formation of BaTiO3 ceramics. Grain size was measured by scanning electron microscopy (SEM). The computer-controlled dielectric measurement system consisted of a high precision LCR-meter. Electric field induced polarization was measured by Sawyer-Tower circuit. In this work, the effect of phase combination in BaTiO3 ceramics on electrical properties (dielectric and electric field induced polarization) and microstructure was investigated.

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Deep learning models of the retinal response to natural scenes 30

Deep learning models of the retinal response to natural scen...

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30th Annual Conference on Neural Information Processing Systems, NIPS 2016

作者： McIntosh, Lane T. Maheswaranathan, Niru Nayebi, Aran Ganguli, Surya Baccus, Stephen A. Neurosciences PhD Program United States Department of Applied Physics Mexico Neurobiology Department Stanford University United States

关键词： Deep neural networks

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Hot air treatment: Alternative annealing of TiO2 nanoparticulate films without substrate deformation

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AIP Conference Proceedings 2020年第1期2279卷

作者： Arisara Panthawan Winai Thongpan Porntipa Pooseekheaw Nidchamon Jumrus Tewasin Kumpika Wattikon Sroila Ekkapong Kantarak Panupong Sanmuangmoon Adisorn Tuantranont Wiradej Thongsuwan Pisith Singjai 1PhD’s Degree Program in Materials Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand 3Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand 2Center of Excellence in Materials Science and Technology Chiang Mai University Chiang Mai 50200 Thailand 4Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand 5Thailand Organic and Printed Electronics Innovation Center National Electronics and Computer Technology Center National Science and Technology Development Agency (Klong Luang Pathumthani 12120 Thailand) 6Center of Advanced Materials of Printed Electronics and Sensors Materials Science Research Center Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand

Titanium dioxide (TiO2) nanoparticulate films was successfully annealed on a glass substrate via alternative hot air treatment (HAT). Interestingly, HAT not only protects the glass substrate deformation but can also reduce cost and time in the annealing process. The annealed films using HAT at 500 °C for 10 min can be compared with the annealed films in conventional furnace heat treatment (FHT) at 500 °C for 60 min. The results showed the sizes of ∼7.9 nm are obtained after the films annealed with both annealing techniques. The surface roughness of the as-deposited, the annealed films using FHT and HAT were 17.37, 23.74 and 23.26 nm, respectively. The energy band gap of the as- deposited films, the annealed films using FHT and HAT were 3.24 eV, 3.1 and 3.19 eV, respectively. Moreover, the annealed films using FHT and HAT techniques show superhydrophilic with a water contact angle of 3.42° and 2.81°, while the as-deposited films was 8.93°. After aging time testing, superhydrophilicity of the annealed films using HAT is greater than FHT. The result is in good agreement with Ti wt% of the as-deposited, the annealed films using FHT and HAT left on the substrate to 0.15, 0.73 and 0.65 nm after testing simulation for 20 years.

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