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arXiv 2024年

作者： Siedentop, Lukas Lui, Gianluc Maret, Georg Chaikin, Paul M. Steinhardt, Paul J. Torquato, Salvatore Keim, Peter Florescu, Marian Department of Physics University of Konstanz Konstanz78457 Germany Advanced Technology Institute Department of Physics University of Surrey Surrey GuildfordGU2 7XH United Kingdom Department of Physics New York University New YorkNY20012 United States Department of Physics Princeton University PrincetonNJ08544 United States Department of Chemistry Princeton University PrincetonNJ08544 United States Princeton Materials Institute Princeton University PrincetonNJ08544 United States Program in Applied and Computational Mathematics Princeton University PrincetonNJ08544 United States Max-Planck-Institute for Dynamics and Self-Organization Göttingen37077 Germany Institute for the Dynamics of Complex Systems University of Göttingen Göttingen37077 Germany

In photonic crystals the propagation of light is governed by their photonic band structure, an ensemble of propagating states grouped into bands, separated by photonic band gaps. Due to discrete symmetries in spatially strictly periodic dielectric structures their photonic band structure is intrinsically anisotropic. However, for many applications, such as manufacturing artificial structural color materials or developing photonic computing devices, but also for the fundamental understanding of light-matter interactions, it is of major interest to seek materials with long range non-periodic dielectric structures which allow the formation of isotropic photonic band gaps. Here, we report the first ever 3D isotropic photonic band gap for an optimized disordered stealthy hyperuniform structure for microwaves. The transmission spectra are directly compared to a diamond pattern and an amorphous structure with similar node density. The band structure is measured experimentally for all three microwave structures, manufactured by 3D-Laser-printing for meta-materials with refractive index up to n = 2.1. Results agree well with finite-difference-time-domain numerical investigations and a priori calculations of the band-gap for the hyperuniform structure: the diamond structure shows gaps but being anisotropic as expected, the stealthy hyperuniform pattern shows an isotropic gap of very similar magnitude, while the amorphous structure does not show a gap at all. The centimeter scaled microwave structures may serve as prototypes for micrometer scaled structures with bandgaps in the technologically very interesting region of infrared (IR). Copyright © 2024, The Authors. All rights reserved.

关键词： Anisotropy

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Search for Continuous Gravitational Waves from Known Pulsars in the First Part of the Fourth LIGO-Virgo-KAGRA Observing Run

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Astrophysical Journal 2025年第2期983卷 99-99页

作者： Abac, A.G. Abbott, R. Abouelfettouh, I. Acernese, F. Ackley, K. Adhicary, S. Adhikari, N. Adhikari, R.X. Adkins, V.K. Agarwal, D. Agathos, M. Aghaei Abchouyeh, M. Aguiar, O.D. Aguilar, I. Aiello, L. Ain, A. Ajith, P. Akutsu, T. Albanesi, S. Alfaidi, R.A. Al-Jodah, A. Alléné, C. Allocca, A. Al-Shammari, S. Altin, P.A. Alvarez-Lopez, S. Amato, A. Amez-Droz, L. Amorosi, A. Amra, C. Ananyeva, A. Anderson, S.B. Anderson, W.G. Andia, M. Ando, M. Andrade, T. Andres, N. Andrés-Carcasona, M. Andrić, T. Anglin, J. Ansoldi, S. Antelis, J.M. Antier, S. Aoumi, M. Appavuravther, E.Z. Appert, S. Apple, S.K. Arai, K. Araya, A. Araya, M.C. Areeda, J.S. Argianas, L. Aritomi, N. Armato, F. Arnaud, N. Arogeti, M. Aronson, S.M. Ashton, G. Aso, Y. Assiduo, M. Assis de Souza Melo, S. Aston, S.M. Astone, P. Attadio, F. Aubin, F. AultONeal, K. Avallone, G. Babak, S. Badaracco, F. Badger, C. Bae, S. Bagnasco, S. Bagui, E. Baier, J.G. Baiotti, L. Bajpai, R. Baka, T. Ball, M. Ballardin, G. Ballmer, S.W. Banagiri, S. Banerjee, B. Bankar, D. Baral, P. Barayoga, J.C. Barish, B.C. Barker, D. Barneo, P. Barone, F. Barr, B. Barsotti, L. Barsuglia, M. Barta, D. Bartoletti, A.M. Barton, M.A. Bartos, I. Basak, S. Basalaev, A. Bassiri, R. Basti, A. Bates, D.E. Bawaj, M. Baxi, P. Bayley, J.C. Baylor, A.C. Baynard, P.A. Bazzan, M. Bedakihale, V.M. Beirnaert, F. Bejger, M. Belardinelli, D. Bell, A.S. Benedetto, V. Benoit, W. Bentley, J.D. Ben Yaala, M. Bera, S. Berbel, M. Bergamin, F. Berger, B.K. Bernuzzi, S. Beroiz, M. Bersanetti, D. Bertolini, A. Betzwieser, J. Beveridge, D. Bevins, N. Bhandare, R. Bhardwaj, U. Bhatt, R. Bhattacharjee, D. Bhaumik, S. Bhowmick, S. Bianchi, A. Bilenko, I.A. Billingsley, G. Binetti, A. Bini, S. Birnholtz, O. Biscoveanu, S. Bisht, A. Bitossi, M. Bizouard, M.-A. Blackburn, J.K. Blagg, L.A. Blair, C.D. Blair, D.G. Bobba, F. Bode, N. Boileau, G. Boldrini, M. Bolingbroke, G.N. Bolliand, A. Bonavena, L.D. Bondarescu, R. Bondu, F. Bonilla, E. Bonilla, M.S. Bonino, A. Bonnand, R. Booker, P. Borchers, A. Boschi, V. Bose, S. Boss Max Planck Institute for Gravitational Physics (Albert Einstein Institute) Potsdam D-14476 Germany LIGO Laboratory California Institute of Technology Pasadena 91125 CA United States LIGO Hanford Observatory Richland 99352 WA United States Dipartimento di Farmacia Università di Salerno Fisciano Salerno I-84084 Italy INFN Sezione di Napoli Napoli I-80126 Italy University of Warwick Coventry CV 47AL United Kingdom The Pennsylvania State University University Park 16802 PA United States University of Wisconsin-Milwaukee Milwaukee 53201 WI United States Louisiana State University Baton Rouge 70803 LA United States Université Catholique de Louvain Louvain-la-Neuve B-1348 Belgium Inter-University Centre for Astronomy and Astrophysics Pune 411007 India Queen Mary University of London London E1 4NS United Kingdom Department of Physics and Astronomy Sejong University 209 Neungdong-ro Gwangjin-gu Seoul 143-747 South Korea Instituto Nacional de Pesquisas Espaciais São José dos Campos São Paulo 12227-010 Brazil Stanford University Stanford 94305 CA United States Università di Roma Tor Vergata Roma I-00133 Italy INFN Sezione di Roma Tor Vergata Roma I-00133 Italy Cardiff University Cardiff CF24 3AA United Kingdom Universiteit Antwerpen Antwerpen 2000 Belgium International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru 560089 India Gravitational Wave Science Project National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka City Tokyo 181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka City Tokyo 181-8588 Japan INFN Sezione di Torino Torino I-10125 Italy Theoretisch-Physikalisches Institut Friedrich-Schiller-Universität Jena Jena D-07743 Germany Dipartimento di Fisica Università degli Studi di Torino Torino I-10125 Italy SUPA University of Glasgow Glasgow G12 8QQ United Kingdom OzGrav University of Western Australia Crawley 6009 WA

Continuous gravitational waves (CWs) emission from neutron stars carries information about their internal structure and equation of state, and it can provide tests of general relativity. We present a search for CWs from a set of 45 known pulsars in the first part of the fourth LIGO-Virgo-KAGRA observing run, known as O4a. We conducted a targeted search for each pulsar using three independent analysis methods considering single-harmonic and dual-harmonic emission models. We find no evidence of a CW signal in O4a data for both models and set upper limits on the signal amplitude and on the ellipticity, which quantifies the asymmetry in the neutron star mass distribution. For the single-harmonic emission model, 29 targets have the upper limit on the amplitude below the theoretical spin-down limit. The lowest upper limit on the amplitude is 6.4 × 10^-27 for the young energetic pulsar J0537-6910, while the lowest constraint on the ellipticity is 8.8 × 10^-9 for the bright nearby millisecond pulsar J0437-4715. Additionally, for a subset of 16 targets, we performed a narrowband search that is more robust regarding the emission model, with no evidence of a signal. We also found no evidence of nonstandard polarizations as predicted by the Brans-Dicke theory. © 2025. The Author(s). Published by the American Astronomical Society.

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Synthesis of FeCoNi nanoparticles by galvanostatic technique

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AIP Conference Proceedings 2016年第1期1746卷

作者： Setia Budi Masayu Elita Hafizah Azwar Manaf 1Potgraduate Program of Materials Science Study Department of Physics Faculty of Mathematics and Natural Sciences Universitas Indonesia Depok 16424 Indonesia 2Department of Chemistry Faculty of Mathematics and Sciences Universitas Negeri Jakarta Jl. Pemuda No.10 Rawamangun Jakarta 13220 Indonesia

Soft magnetic nanoparticles of FeCoNi have been becoming interesting objects for many researchers due to its potential application in electronic devices. One of the most promising methods for material preparation is the electrodeposition which capable of growing nanoparticles alloy directly onto the substrate. In this paper, we report our electrodeposition studies on nanoparticles synthesis using galvanostatic electrodeposition technique. Chemical composition of the synthesized FeCoNi was successfully controlled through the adjustment of the applied currents. It is revealed that the content of each element, obtained from quantitative analysis using atomic absorption spectrometer (AAS), could be modified by the adjustment of current in which Fe and Co content decreased at larger applied currents, while Ni content increased. The nanoparticles of Co-rich FeCoNi and Ni-rich FeCoNi were obtained from sulphate electrolyte at the range of applied current investigated in this work. Broad diffracted peaks in the X-ray diffractograms indicated typical nanostructures of the solid solution of FeCoNi.

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Density assessment based on 3D CT density log: A case study of Sawah Tambang Formation, Ombilin Basin

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AIP Conference Proceedings 2018年第1期2023卷

作者： A. Gurmilang A. Haris A. Larope 1Reservoir Geophysics Graduate Program Department of Physics Faculty of Mathematics and Natural Sciences (FMIPA)Universitas Indonesia Jakarta 10430 Indonesia 2Department of Physics Faculty of Mathematics and Natural Sciences (FMIPA) Universitas Indonesia Depok 16424 Indonesia 3Research and Development Center for Oil and Gas Technology (LEMIGAS) Jakarta 12330 Indonesia

Density assessment of Sawah Tambang Formation, Ombilin Basin has been done using three-dimensional compute tomography (3D CT) density log approach. Laboratory testing of reservoir core, as well as their evaluations in Central West Sumatra is expected to be better support of core rock analysis process so that it can assist in increasing national oil production. The aim of this research is to determine the direct relationship between the CT number and the grain density of the core. Research method performed measurement of 3D CT scan in the whole core to visualize the 3D core image. The 3D visualize core used to determine the proper location of side wall plug, so the damage cause by the core plugs minimalized. The core side wall plug CT number has been measured and then the grain density calculated. The calculation of grain density derived from permeability, which is measured from the gas permeameter. The result of this two-process cross-plotted and generating the empirical model of the relationship between the CT number and the grain density by using the linear regression. The result of this research showing the empirical model of the sandstone and shale separated in the cross plot between the grain density and the CT number. Linear equation of this relationship divided into two equation which is y = 1835.6x - 3089.7 for the shale zone and y = 1819.9x - 3195.9 for sandstone zone. This linear regression formula used to estimate the grain density value based on the CT number.

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Reservoir characterization using stochastic seismic inversion in “K” gas field, Bonaparte Basin

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AIP Conference Proceedings 2021年第1期2320卷

作者： Tri Wicaksono Abdul Haris Agus Riyanto Pradityo Riyadi 1Reservoir Geophysics Graduate Program Physics Department FMIPA Universitas Indonesia Depok Indonesia 2Department of Mathematics FMIPA Universitas Indonesia Depok Indonesia 3Pusat Penelitian dan Pengembangan Teknologi Minyak dan Gas Bumi LEMIGAS Jakarta 12230 Indonesia

The deterministic seismic inversion method has been successfully used in various projects in exploration and development. This method enables the interpreter to get a better understanding of subsurface by omitting the wavelet and tuning effects; therefore, quantitative reservoir properties can be generated. However, this method has significant limitations by generating average impedances of each layer, and the range of values is smaller than the impedance from the wells; therefore, the inversion will not produce results that are not within the calibration range. Stochastic seismic inversion is done by conditioning well data and reproducing spatially varying statistics using a variogram, which could overcome the deterministic limitation. This method generates multiple realizations of high-frequency elastic properties that are consistent with both seismic amplitude and well data. These two methods are applied in “K” gas field, which located in the offshore Bonaparte Basin, Eastern Indonesia. Geologically, the “K” field is located within a relatively undeformed Australian continental margin that extends into Indonesian waters. This field contains a significant gas column, reservoir within shallow marine, highly mature, quartzose sandstone of the Middle Jurassic Plover Formation. Potential targets in the area may be large folds, horst blocks, and tilted fault blocks trap in the Palaeozoic section. The application of stochastic seismic inversion showed significant benefits compared to deterministic, especially in “K” gas field, where the reservoirs are stacked sandstone with intra-formational shale. Some of the reservoir and all the intraformational shales are below seismic resolution. Stochastic seismic inversion is able to distinguish those features, and in addition, the inverted volumes with multiple realizations with ranking criteria for P10, P50, and P90 of impedance, and vp/vs could be utilized to reduce the risk associated with exploration plan and field developme

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Increasing the efficiency of photovoltaic streetlight through microalgal fuel cell Spirulina sp. series circuit prototypes

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AIP Conference Proceedings 2023年第1期2634卷

作者： Fami Israyusnita Nefertiti Riyan Putri Hasanah Indri Febriani Facchur Rozy Dwi Septian Indra Kurniawan Saputra 1Department of Biology Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Malang Indonesia 2Department of Physics Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Malang Indonesia 3Department of Electrical Engineering Faculty of Engineering Universitas Negeri Malang Malang Indonesia 4Biotechnology Study Program Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Malang Indonesia

Climate change is one of the various problems faced by various countries. Many sectors that contribute to climate change, electricity, and heat production were identified as the main contributors to CO2 emissions worldwide. On the other hand, Spirulina sp. potential for becoming power generator because it has good photosynthetic efficiency as anolyte biophotovoltaic devices. This research aims to test the effectiveness of photovoltaic using Spirulina sp. and develop Spirulina sp. as streetlights. The prototype uses 21 pairs of Spirulina sp. microalgal fuel cells as generator, based on voltage measurements using 100 ml anolyte and 500 ml catholyte which produces voltage value 405 mV. Using 21 pairs of series circuits, the voltage value obtained is 17.6 V. This prototype is equipped with aeration system to support the life of Spirulina sp. and equipped with LDR sensor for automation refers to the presence/absence of sunlight. Based on the results, there are challenges in the form of prototype sizes that are not suitable for streetlights in general, so further studies are needed to implement and commercial photovoltaic streetlights based on Spirulina sp. microalgal fuel cells.

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Geomechanic application for hydraulic fracturing in lower Pematang formation, Central Sumatra Basin

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AIP Conference Proceedings 2018年第1期2023卷

作者： N. N. Fitri F. Fennita M. Adrian S. Supriyanto R. Ramadian 1Reservoir Geophysics Graduate Program Department of Physics Faculty of Mathematics and Natural Sciences (FMIPA) Universitas Indonesia Jakarta 10430 Indonesia 2Department of Physics Faculty of Mathematics and Natural Sciences (FMIPA) Universitas Indonesia Depok 16424 Indonesia 3Geology and Geophysics Program Faculty of Mathematics and Natural Sciences (FMIPA) Universitas Indonesia Depok 16424 Indonesia 4Geoscience Division PT Energi Mega Persada Jalan H.R. Rasuna Said Jakarta 12940 Indonesia

NN field is located onshore within the Malacca Strait Block. The field was discovered in 1990 by drilling N-01 exploration well which proven oil in the Manggala and Pematang Formations. In 1998, 3D Seismic was acquired and successfully identified three compartments in this field which separated by N-S faults. This study is focusing on Lower Pematang Formation which belongs to Pematang Group and deposited in braided-fluvial system. The Lower Pematang reservoir is tight sandstone with blocky log-type model. In this study Eaton method is used to calculate pore pressure prediction and to make transformation log Vp, Vs and density into Poisson’s Ratio and to calculate fracture pressure. In order to optimize the oil production, hydraulic fracturing stimulation was chosen and became proven technique in this reservoir. Further geomechanic study is required to support hydraulic fracturing jobs by providing a 3D model of pore pressure and fracture pressure. Several geo-mechanics rock properties such as pore pressure, Poisson’s ratio, Young’s Modulus and Fracture Pressure were calculated in wells and then propagate troughout NN fields. With 3D model, a robust recommendation on field deveopment via hydraulic fracturing can be achieved and oil recovery will optimum. Moreover, from 3D model, we could propose how much pressure can be applied in injection without damaging formation target.

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Integration of modern macromedia flash technology with Indonesian traditional game for interactive physics learning

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AIP Conference Proceedings 2021年第1期2330卷

作者： Nurul Hidayat Rani Wahyu Andani Badi’atus Sholihah Izzatun Navis Erni Yulianti 1Department of Physics Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Jl. Semarang 5 Malang 65145 Indonesia 2Department of Mathematics Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Jl. Semarang 5 Malang 65145 Indonesia 3Science Education Study Program Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Jl. Semarang 5 Malang 65145 Indonesia

Until recently, physics has been considered as one of the most challenging subjects for students due to the various calculation and formula memorization. Plenty of studies stated that students’ learning difficulties are caused by inappropriate methods used by the teachers. They still employ conventional approaches, implying low students’ learning motivation. Many studies revealed that students’ motivation could be overcome by using interactive media. But then again, other reports claimed that they were not well accommodated due to the poor of students’ kinesthetic involvement. Therefore, we developed the media technology combined with a traditional Indonesian game as a solution to facilitate interactive learning. In this study, simple harmonic motion (SHM) was chosen as the material provided in the produced media. We adapted a modified-ADDIE model to develop the physics learning media. In this present study, the report focuses on the development of the media which integrated modern technology and traditional game. Engklek (hopscotch) was opted as the conventional game which then designed in such a way that it was convenient to be implemented in physics learning. Several puzzles and quizzes utilizing a modern Macromedia Flash player were also incorporated to trigger students during the learning process. The appropriateness of the developed product GATA-FISIKA was obtained from the product validation and the readability test. The product validation was done by experts, and the readability was tested to 28 students in a senior high school in Malang, Indonesia. Our study discovered that GATA-FISIKA can be effectively used for interactive physics learning with excellent feasibility and readability. In addition, we also reported the step-by-step guide on how to use GATA-FISIKA for teaching.

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Tilings of space and superhomogeneous point processes

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Physical Review E 2008年第3期77卷 031125-031125页

作者： A. Gabrielli M. Joyce S. Torquato SMC-INFM Dipartimento di Fisica Università La Sapienza P.le A. Moro 2 I-00185 Rome Italy ISC-CNR Via dei Taurini 19 I-00185 Rome Italy Laboratoire de Physique Nucléaire et de Hautes Energies UMR-7585 Université Pierre et Marie Curie Paris 6 75252 Paris Cedex 05 France Department of Chemistry Princeton University Princeton New Jersey 08544 USA Program in Applied and Computational Mathematics Princeton University Princeton New Jersey 08544 Princeton Institute for the Science and Technology of Materials Princeton University Princeton New Jersey 08544 USA Princeton Center for Theoretical Physics Princeton University Princeton New Jersey 08544 USA

We consider the construction of point processes from tilings, with equal-volume tiles, of d-dimensional Euclidean space Rd. We show that one can generate, with simple algorithms ascribing one or more points to each tile, point processes which are “superhomogeneous” (or “hyperuniform”)—i.e., for which the structure factor S(k) vanishes when the wave vector k tends to zero. The exponent γ characterizing the leading small-k behavior, S(k→0)∝kγ, depends in a simple manner on the nature of the correlation properties of the specific tiling and on the conservation of the mass moments of the tiles. Assigning one point to the center of mass of each tile gives the exponent γ=4 for any tiling in which the shapes and orientations of the tiles are short-range correlated. Smaller exponents in the range 4−d<γ<4 (and thus always superhomogeneous for d≤4) may be obtained in the case that the latter quantities have long-range correlations. Assigning more than one point to each tile in an appropriate way, we show that one can obtain arbitrarily higher exponents in both cases. We illustrate our results with explicit constructions using known deterministic tilings, as well as some simple stochastic tilings for which we can calculate S(k) exactly. Our results provide an explicit analytical construction of point processes with γ>4. Applications to condensed matter physics, and also to cosmology, are briefly discussed.

关键词： SIMULATIONS CAUSALITY SPECTRUM

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Investigation of the effectiveness of nursing model on the job satisfaction level

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AIP Conference Proceedings 2023年第1期2634卷

作者： Titik Suhartini Wahida Yuliana Retno Hastri Risqi Romdhani Ahmad Taufiq 1Department of Nursing Program Study of Diploma III Nursing: Sekolah Tinggi Ilmu Kesehatan Hafshawaty Pesantren Zainul Hasan Probolinggo Indonesia 2Department of Midwifery Program Study of Midwifery Professional Education Sekolah Tinggi Ilmu Kesehatan Hafshawaty Pesantren Zainul Hasan Probolinggo Indonesia 3Department of Physics Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Indonesia

Nursing care is a form of authority and responsibility of nurses to fulfill nursing services in facilitating the compliance of the patients' needs using a nursing process methodology. The provision of nursing care must be carried out with an appropriate method based on the response complained of by the patient. Suitable nursing care methods affect the job satisfaction of nurses. This study aims to analyze the effectiveness of nursing care methods on the level of job satisfaction. The research design used correlational analytics. The sample used was 112 inpatient nurses selected using stratified random sampling. The data analysis was carried out using Kendall's Tau test in determining the relationship between variables with a significance level of p ≤ 0.05. The results confirm that the hospital is one of the health service facilities provided to the community in meeting the needs of health and illness. Services are provided comprehensively and sustainably according to patient needs. Nursing care is the right choice in facilitating or meeting patient needs. Nursing care methods are the principal capital in providing services to patients.

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