cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Pengembangan Desain Arsitektur Blok Modular Melalui Optimisasi Struktur Tahan Gempa Berbasis Parametrik
Creators: name: Permana
name: Kresnadian Tedjawinata, Galuh
Publisher: name: Lembaga Pengembangan Inovasi dan Kewirausahaan ITB (LPIK/ DKST-ITB)
Year: 2024

description: Indonesia terletak di kawasan Ring of Fire Pasifik, yang memiliki risiko laten terhadap bencana gempa. Oleh karena itu, diperlukan eksplorasi pendekatan inovatif dalam desain struktur tahan gempa. Penelitian ini menghasilkan sistem bangunan blok kayu modular yang dioptimalkan dan dikembangkan melalui pendekatan pemodelan parametrik.

Riset ini mensimulasikan komponen struktur ke dalam profil digital yang merepresentasikan kondisi faktual, dengan memanfaatkan material lokal berupa kayu kelas dua. Kayu jenis ini umumnya memiliki kekuatan rendah, tetapi dapat ditingkatkan melalui strategi rekayasa desain yang inovatif. Dengan mengintegrasikan perangkat lunak Kangaroo dan Karamba, penelitian ini menghasilkan desain modular tahan gempa yang dievaluasi berdasarkan parameter seperti perpindahan, pemanfaatan material, dan distribusi tegangan.

Selain itu, penelitian ini mengacu pada standar SNI, di mana bangunan tahan gempa harus mampu menahan gempa berkekuatan hingga 8 magnitudo. Hasil temuan menunjukkan bahwa sistem ini secara signifikan meningkatkan kinerja struktural bangunan blok kayu modular, sekaligus menghadirkan solusi arsitektur yang terjangkau dan berkelanjutan bagi Indonesia.
Drone Detection Using Convolutional Neural Networks
Creators: name: Mahdavi, Fatemeh
name: Rajabi, Roozbeh
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In image processing, it is essential to detect and track air targets, especially UAVs. In this paper, we detect the flying drone using a fisheye camera. In the field of diagnosis and classification of objects, there are always many problems that prevent the development of rapid and significant progress in this area. During the previous decades, a couple of advanced classification methods such as convolutional neural networks and support vector machines have been developed. In this study, the drone was detected using three methods of classification of convolutional neural network (CNN), support vector machine (SVM), and nearest neighbor. The outcomes show that CNN, SVM, and nearest neighbor have total accuracy of 95%, 88%, and 80%, respectively. Compared with other classifiers with the same experimental conditions, the accuracy of the convolutional neural network classifier is satisfactory.
description: 5 pages, conference
title: Ð¤ÑÐ½Ð´Ð°Ð¼ÐµÐ½ÑÐ°Ð»ÑÐ½ÑÐµ Ð¸ Ð¿ÑÐ¸ÐºÐ»Ð°Ð´Ð½ÑÐµ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ Ð² Ð¾Ð±Ð»Ð°ÑÑÐ¸ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ, ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÐºÐ¸ Ð¸ ÑÐ¾ÑÐ³Ð¾Ð²Ð»Ð¸. Ð§. 2
title: ÑÐ±Ð¾ÑÐ½Ð¸Ðº ÑÑÑÐ´Ð¾Ð² ÐÑÐµÑÐ¾ÑÑÐ¸Ð¹ÑÐºÐ¾Ð¹ Ð½Ð°ÑÑÐ½Ð¾-Ð¿ÑÐ°ÐºÑÐ¸ÑÐµÑÐºÐ¾Ð¹ Ð¸ ÑÑÐµÐ±Ð½Ð¾-Ð¼ÐµÑÐ¾Ð´Ð¸ÑÐµÑÐºÐ¾Ð¹ ÐºÐ¾Ð½ÑÐµÑÐµÐ½ÑÐ¸Ð¸
titleType: Subtitle
Creators: name: "Ð¤ÑÐ½Ð´Ð°Ð¼ÐµÐ½ÑÐ°Ð»ÑÐ½ÑÐµ Ð¸ Ð¿ÑÐ¸ÐºÐ»Ð°Ð´Ð½ÑÐµ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ Ð² Ð¾Ð±Ð»Ð°ÑÑÐ¸ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ, ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÐºÐ¸ Ð¸ ÑÐ¾ÑÐ³Ð¾Ð²Ð»Ð¸", Ð²ÑÐµÑÐ¾ÑÑÐ¸Ð¹ÑÐºÐ°Ñ Ð½Ð°ÑÑÐ½Ð¾-Ð¿ÑÐ°ÐºÑÐ¸ÑÐµÑÐºÐ°Ñ Ð¸ ÑÑÐµÐ±Ð½Ð¾-Ð¼ÐµÑÐ¾Ð´Ð¸ÑÐµÑÐºÐ°Ñ ÐºÐ¾Ð½ÑÐµÑÐµÐ½ÑÐ¸Ñ (2024; Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³)
Publisher: name: ÐÐÐÐÐ¢ÐÐ¥-ÐÐ ÐÐ¡Ð¡
Year: 2024
Subjects: Ð½Ð°ÑÑÐ½ÑÐµ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ
ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÐºÐ°
Ð¼ÐµÐ½ÐµÐ´Ð¶Ð¼ÐµÐ½Ñ
ÑÐ¾ÑÐ³Ð¾Ð²Ð»Ñ

description: Ð ÑÐ±Ð¾ÑÐ½Ð¸ÐºÐµ Ð¿ÑÐ±Ð»Ð¸ÐºÑÑÑÑÑ ÑÑÐ°ÑÑÐ¸ Ð¿Ð¾ Ð¼Ð°ÑÐµÑÐ¸Ð°Ð»Ð°Ð¼ Ð´Ð¾ÐºÐ»Ð°Ð´Ð¾Ð², Ð¿ÑÐµÐ´ÑÑÐ°Ð²Ð»ÐµÐ½Ð½ÑÑ Ð½Ð° ÑÐµÐºÑÐ¸Ð¾Ð½Ð½ÑÑ Ð·Ð°ÑÐµÐ´Ð°Ð½Ð¸ÑÑ ÐÑÐµÑÐ¾ÑÑÐ¸Ð¹ÑÐºÐ¾Ð¹ Ð½Ð°ÑÑÐ½Ð¾-Ð¿ÑÐ°ÐºÑÐ¸ÑÐµÑÐºÐ¾Ð¹ Ð¸ ÑÑÐµÐ±Ð½Ð¾-Ð¼ÐµÑÐ¾Ð´Ð¸ÑÐµÑÐºÐ¾Ð¹ ÐºÐ¾Ð½ÑÐµÑÐµÐ½ÑÐ¸Ð¸ Â«Ð¤ÑÐ½Ð´Ð°Ð¼ÐµÐ½ÑÐ°Ð»ÑÐ½ÑÐµ Ð¸ Ð¿ÑÐ¸ÐºÐ»Ð°Ð´Ð½ÑÐµ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ Ð² Ð¾Ð±Ð»Ð°ÑÑÐ¸ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ, ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÐºÐ¸ Ð¸ ÑÐ¾ÑÐ³Ð¾Ð²Ð»Ð¸Â». Ð¡ÑÐ°ÑÑÐ¸ Ð¾ÑÑÐ°Ð¶Ð°ÑÑ ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½ÑÐ¹ ÑÑÐ¾Ð²ÐµÐ½Ñ Ð½Ð°ÑÑÐ½Ð¾-Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°ÑÐµÐ»ÑÑÐºÐ¾Ð¹ Ð¸ Ð¼ÐµÑÐ¾Ð´Ð¸ÑÐµÑÐºÐ¾Ð¹ ÑÐ°Ð±Ð¾ÑÑ ÑÑÐ°ÑÑÐ½Ð¸ÐºÐ¾Ð² ÐºÐ¾Ð½ÑÐµÑÐµÐ½ÑÐ¸Ð¸ Ð² Ð¾Ð±Ð»Ð°ÑÑÐ¸ ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÐºÐ¸, Ð¼ÐµÐ½ÐµÐ´Ð¶Ð¼ÐµÐ½ÑÐ° Ð¸ ÑÐ¾ÑÐ³Ð¾Ð²Ð»Ð¸, ÑÐµÑÑÑÑÐºÑÑÑÐ¸Ð·Ð°ÑÐ¸Ð¸ ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÐºÐ¸ Ð² ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½ÑÑ ÑÑÐ»Ð¾Ð²Ð¸ÑÑ Ð½Ð° Ð¼Ð¸ÐºÑÐ¾- Ð¸ Ð¼Ð°ÐºÑÐ¾ÑÑÐ¾Ð²Ð½ÑÑ, ÑÐµÑÐ½Ð¾Ð»Ð¾Ð³Ð¸Ð¹ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Ð±Ð¸Ð·Ð½ÐµÑÐ¾Ð¼, Ð° ÑÐ°ÐºÐ¶Ðµ Ð¿Ð¾ÐºÐ°Ð·ÑÐ²Ð°ÑÑ Ð¸Ð½Ð½Ð¾Ð²Ð°ÑÐ¸Ð¾Ð½Ð½ÑÐµ Ð¿Ð¾Ð´ÑÐ¾Ð´Ñ Ð² Ð¿Ð¾Ð´Ð³Ð¾ÑÐ¾Ð²ÐºÐµ ÑÐ¿ÐµÑÐ¸Ð°Ð»Ð¸ÑÑÐ¾Ð² Ð²ÑÑÑÐµÐ³Ð¾ Ð¾Ð±ÑÐ°Ð·Ð¾Ð²Ð°Ð½Ð¸Ñ Ð² ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½ÑÑ ÑÑÐ»Ð¾Ð²Ð¸ÑÑ.
Literacy in mid-nineteenth century Devon and Suffolk
Creators: name: Shahidullah, Kazi
Publisher: name: University of British Columbia
Year: 2010

description: In mid-nineteenth century, Devon and Suffolk were both agricultural counties and yet the level of literacy differed considerably between them. This thesis undertakes an investigation of literacy both between and within the two counties and in the process attempts to resolve why Devon was so much more literate than Suffolk. The concept of literacy is still shrouded by a degree of vagueness and it has only been possible to provide some tentative explanations for many of the problems involved. Nevertheless, this thesis has succeeded in locating some of the factors influencing the growth of basic literacy in the two counties. These factors were the extent of poverty, higher concentration of professional and commercial people, lower involvement in agricultural work, greater degree of urbanization and better communication facilities. Also, some of the common assumptions of literacy, e.g., schooling, demand for child labour and religious allegiance of the people, has been challenged, and the doors for the most fruitful areas to pursue revealed for future scholars. Most of the work for this thesis has stemmed from primary source material. The Parliamentary Papers is a mine of information and has been extremely helpful for this study. Even then, it should be pointed out that the Parliamentary Papers, despite its usefulness, have certain limitations which restricts the scope of this thesis.
Turbulence-condensate interaction in two dimensions
Creators: name: Xia, H.
name: Punzmann, H.
name: Falkovich, G.
name: Shats, M. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: We present experimental results on turbulence generated in thin fluid layers in the presence of a large-scale coherent flow, or a spectral condensate. It is shown that the condensate modifies the third-order velocity moment in a much wider interval of scales than the second one. The modification may include the change of sign of the third moment in the inverse cascade. This observation may help resolve a controversy on the energy flux in mesoscale atmospheric turbulence (10-500 km): to recover a correct energy flux from the third velocity moment one needs first to subtract the coherent flow. We find that the condensate also increases the velocity flatness.
description: 4 pages, 4 figures
MPEC 2025-G43 : 2025 FC22
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2025 FC22

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Extended ASP tableaux and rule redundancy in normal logic programs
Creators: name: Järvisalo, Matti
name: Oikarinen, Emilia
Publisher: name: arXiv
Year: 2008
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: We introduce an extended tableau calculus for answer set programming (ASP). The proof system is based on the ASP tableaux defined in [Gebser&Schaub, ICLP 2006], with an added extension rule. We investigate the power of Extended ASP Tableaux both theoretically and empirically. We study the relationship of Extended ASP Tableaux with the Extended Resolution proof system defined by Tseitin for sets of clauses, and separate Extended ASP Tableaux from ASP Tableaux by giving a polynomial-length proof for a family of normal logic programs P_n for which ASP Tableaux has exponential-length minimal proofs with respect to n. Additionally, Extended ASP Tableaux imply interesting insight into the effect of program simplification on the lengths of proofs in ASP. Closely related to Extended ASP Tableaux, we empirically investigate the effect of redundant rules on the efficiency of ASP solving. To appear in Theory and Practice of Logic Programming (TPLP).
description: 27 pages, 5 figures, 1 table
Energy deposition in Saturn's equatorial upper atmosphere
Creators: name: Chadney, J. M.
name: Koskinen, T. T.
name: Hu, X.
name: Galand, M.
name: Lavvas, P.
name: Unruh, Y. C.
name: Serigano, J.
name: Hörst, S. M.
name: Yelle, R. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: We construct Saturn equatorial neutral temperature and density profiles of H, H$_2$, He, and CH$_4$, between 10$^{-12}$ and 1 bar using measurements from Cassini's Ion Neutral Mass Spectrometer (INMS) taken during the spacecraft's final plunge into Saturn's atmosphere on 15 September 2017, combined with previous deeper atmospheric measurements from the Cassini Composite InfraRed Spectrometer (CIRS) and from the UltraViolet Imaging Spectrograph (UVIS). These neutral profiles are fed into an energy deposition model employing soft X-ray and Extreme UltraViolet (EUV) solar fluxes at a range of spectral resolutions ($Δλ=4\times10^{-3}$ nm to 1 nm) assembled from TIMED/SEE, from SOHO/SUMER, and from the Whole Heliosphere Interval (WHI) quiet Sun campaign. Our energy deposition model calculates ion production rate profiles through photo-ionisation and electron-impact ionisation processes, as well as rates of photo-dissociation of CH$_4$. The ion reaction rate profiles we determine are important to obtain accurate ion density profiles, meanwhile methane photo-dissociation is key to initiate complex organic chemical processes. We assess the importance of spectral resolution in the energy deposition model by using a high-resolution H$_2$ photo-absorption cross section, which has the effect of producing additional ionisation peaks near 800 km altitude. We find that these peaks are still formed when using low-resolution ($Δλ=1$ nm) or mid-resolution ($Δλ=0.1$ nm) solar spectra, as long as high-resolution cross sections are included in the model.
description: 21 pages, 13 figures, 5 tables, accepted for publication in Icarus
Magnetic Excitation in Artificially Designed Oxygen Molecule Magnet
Creators: name: Masuda, T.
name: Takamizawa, S.
name: Hirota, K.
name: Ohba, M.
name: Kitagawa, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We performed inelastic neutron scattering experiment to study magnetic excitation of O$_2$ molecules adsorbed in microporous compound. The dispersionless excitation with characteristic intensity modulation is observed at $\hbar ω= 7.8$ meV at low temperature. The neutron cross section is explained by spin dimer model with intradimer distance of 3.1 Å. Anomalous behaviour in the temperature dependence is discussed in the context of enhanced magnetoelasticity in the soft framework of O$_2$ molecule.
description: 4 pages, 5 figures, to be published in Journal of Physical Society of Japan
Geometric Entropy and Hagedorn/Deconfinement Transition
Creators: name: Fujita, Mitsutoshi
name: Nishioka, Tatsuma
name: Takayanagi, Tadashi
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: It has recently been proposed that the entanglement entropy can be an order parameter of confinement/deconfinement transitions. To find a clear evidence, we introduce a new quantity called the geometric entropy, which is related to the entanglement entropy via a double Wick rotation. We analyze the geometric entropy and manifestly show that its value becomes discontinuous at the Hagedorn temperature both in the free N =4 super Yang-Mills and in its supergravity dual.
description: 18 pages, 2 figures, v2: reference added
Many-body theory of surface-enhanced Raman scattering
Creators: name: Masiello, David J.
name: Schatz, George C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A many-body Green's function approach to the microscopic theory of surface-enhanced Raman scattering is presented. Interaction effects between a general molecular system and a spatially anisotropic metal particle supporting plasmon excitations in the presence of an external radiation field are systematically included through many-body perturbation theory. Reduction of the exact effects of molecular-electronic correlation to the level of Hartree-Fock mean-field theory is made for practical initial implementation, while description of collective oscillations of conduction electrons in the metal is reduced to that of a classical plasma density; extension of the former to a Kohn-Sham density-functional or second-order Møller-Plesset perturbation theory is discussed; further specialization of the latter to the random-phase approximation allows for several salient features of the formalism to be highlighted without need for numerical computation. Scattering and linear-response properties of the coupled system subjected to an external perturbing electric field in the electric-dipole interaction approximation are investigated. Both damping and finite-lifetime effects of molecular-electronic excitations as well as the characteristic fourth-power enhancement of the molecular Raman scattering intensity are elucidated from first principles. It is demonstrated that the presented theory reduces to previous models of surface-enhanced Raman scattering and leads naturally to a semiclassical picture of the response of a quantum-mechanical molecular system interacting with a spatially anisotropic classical metal particle with electronic polarization approximated by a discretized collection of electric dipoles.
description: under review at Physical Review A since June 11, 2008
title: Ð¤ÑÐ½Ð´Ð°Ð¼ÐµÐ½ÑÐ°Ð»ÑÐ½ÑÐµ Ð¸ Ð¿ÑÐ¸ÐºÐ»Ð°Ð´Ð½ÑÐµ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ Ð² Ð¾Ð±Ð»Ð°ÑÑÐ¸ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ, ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÐºÐ¸ Ð¸ ÑÐ¾ÑÐ³Ð¾Ð²Ð»Ð¸. Ð§. 3
title: ÑÐ±Ð¾ÑÐ½Ð¸Ðº ÑÑÑÐ´Ð¾Ð² ÐÑÐµÑÐ¾ÑÑÐ¸Ð¹ÑÐºÐ¾Ð¹ Ð½Ð°ÑÑÐ½Ð¾-Ð¿ÑÐ°ÐºÑÐ¸ÑÐµÑÐºÐ¾Ð¹ Ð¸ ÑÑÐµÐ±Ð½Ð¾-Ð¼ÐµÑÐ¾Ð´Ð¸ÑÐµÑÐºÐ¾Ð¹ ÐºÐ¾Ð½ÑÐµÑÐµÐ½ÑÐ¸Ð¸
titleType: Subtitle
Creators: name: "Ð¤ÑÐ½Ð´Ð°Ð¼ÐµÐ½ÑÐ°Ð»ÑÐ½ÑÐµ Ð¸ Ð¿ÑÐ¸ÐºÐ»Ð°Ð´Ð½ÑÐµ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ Ð² Ð¾Ð±Ð»Ð°ÑÑÐ¸ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ, ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÐºÐ¸ Ð¸ ÑÐ¾ÑÐ³Ð¾Ð²Ð»Ð¸", Ð²ÑÐµÑÐ¾ÑÑÐ¸Ð¹ÑÐºÐ°Ñ Ð½Ð°ÑÑÐ½Ð¾-Ð¿ÑÐ°ÐºÑÐ¸ÑÐµÑÐºÐ°Ñ Ð¸ ÑÑÐµÐ±Ð½Ð¾-Ð¼ÐµÑÐ¾Ð´Ð¸ÑÐµÑÐºÐ°Ñ ÐºÐ¾Ð½ÑÐµÑÐµÐ½ÑÐ¸Ñ (2024; Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³)
Publisher: name: ÐÐÐÐÐ¢ÐÐ¥-ÐÐ ÐÐ¡Ð¡
Year: 2024
Subjects: Ð½Ð°ÑÑÐ½ÑÐµ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ
ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÐºÐ°
Ð¼ÐµÐ½ÐµÐ´Ð¶Ð¼ÐµÐ½Ñ
ÑÐ¾ÑÐ³Ð¾Ð²Ð»Ñ

description: Ð ÑÐ±Ð¾ÑÐ½Ð¸ÐºÐµ Ð¿ÑÐ±Ð»Ð¸ÐºÑÑÑÑÑ ÑÑÐ°ÑÑÐ¸ Ð¿Ð¾ Ð¼Ð°ÑÐµÑÐ¸Ð°Ð»Ð°Ð¼ Ð´Ð¾ÐºÐ»Ð°Ð´Ð¾Ð², Ð¿ÑÐµÐ´ÑÑÐ°Ð²Ð»ÐµÐ½Ð½ÑÑ Ð½Ð° ÑÐµÐºÑÐ¸Ð¾Ð½Ð½ÑÑ Ð·Ð°ÑÐµÐ´Ð°Ð½Ð¸ÑÑ ÐÑÐµÑÐ¾ÑÑÐ¸Ð¹ÑÐºÐ¾Ð¹ Ð½Ð°ÑÑÐ½Ð¾-Ð¿ÑÐ°ÐºÑÐ¸ÑÐµÑÐºÐ¾Ð¹ Ð¸ ÑÑÐµÐ±Ð½Ð¾-Ð¼ÐµÑÐ¾Ð´Ð¸ÑÐµÑÐºÐ¾Ð¹ ÐºÐ¾Ð½ÑÐµÑÐµÐ½ÑÐ¸Ð¸ Â«Ð¤ÑÐ½Ð´Ð°Ð¼ÐµÐ½ÑÐ°Ð»ÑÐ½ÑÐµ Ð¸ Ð¿ÑÐ¸ÐºÐ»Ð°Ð´Ð½ÑÐµ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ Ð² Ð¾Ð±Ð»Ð°ÑÑÐ¸ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ, ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÐºÐ¸ Ð¸ ÑÐ¾ÑÐ³Ð¾Ð²Ð»Ð¸Â». Ð¡ÑÐ°ÑÑÐ¸ Ð¾ÑÑÐ°Ð¶Ð°ÑÑ ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½ÑÐ¹ ÑÑÐ¾Ð²ÐµÐ½Ñ Ð½Ð°ÑÑÐ½Ð¾-Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°ÑÐµÐ»ÑÑÐºÐ¾Ð¹ Ð¸ Ð¼ÐµÑÐ¾Ð´Ð¸ÑÐµÑÐºÐ¾Ð¹ ÑÐ°Ð±Ð¾ÑÑ ÑÑÐ°ÑÑÐ½Ð¸ÐºÐ¾Ð² ÐºÐ¾Ð½ÑÐµÑÐµÐ½ÑÐ¸Ð¸ Ð² Ð¾Ð±Ð»Ð°ÑÑÐ¸ ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÐºÐ¸, Ð¼ÐµÐ½ÐµÐ´Ð¶Ð¼ÐµÐ½ÑÐ° Ð¸ ÑÐ¾ÑÐ³Ð¾Ð²Ð»Ð¸, ÑÐµÑÑÑÑÐºÑÑÑÐ¸Ð·Ð°ÑÐ¸Ð¸ ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÐºÐ¸ Ð² ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½ÑÑ ÑÑÐ»Ð¾Ð²Ð¸ÑÑ Ð½Ð° Ð¼Ð¸ÐºÑÐ¾- Ð¸ Ð¼Ð°ÐºÑÐ¾ÑÑÐ¾Ð²Ð½ÑÑ, ÑÐµÑÐ½Ð¾Ð»Ð¾Ð³Ð¸Ð¹ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Ð±Ð¸Ð·Ð½ÐµÑÐ¾Ð¼, Ð° ÑÐ°ÐºÐ¶Ðµ Ð¿Ð¾ÐºÐ°Ð·ÑÐ²Ð°ÑÑ Ð¸Ð½Ð½Ð¾Ð²Ð°ÑÐ¸Ð¾Ð½Ð½ÑÐµ Ð¿Ð¾Ð´ÑÐ¾Ð´Ñ Ð² Ð¿Ð¾Ð´Ð³Ð¾ÑÐ¾Ð²ÐºÐµ ÑÐ¿ÐµÑÐ¸Ð°Ð»Ð¸ÑÑÐ¾Ð² Ð²ÑÑÑÐµÐ³Ð¾ Ð¾Ð±ÑÐ°Ð·Ð¾Ð²Ð°Ð½Ð¸Ñ Ð² ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½ÑÑ ÑÑÐ»Ð¾Ð²Ð¸ÑÑ.
High-performance deterministic in situ electron-beam lithography enabled by cathodoluminescence spectroscopy
Creators: name: Rodt, Sven
name: Reitzenstein, Stephan
Publisher: name: Technische Universität Berlin
Year: 2021
Subjects: subject: 530 Physik
subject: in situ EBL
subject: deterministic processing
subject: cathodoluminescence spectroscopy
subject: quantum dots
subject: nanophotonics

description: The application of solid-state quantum emitters in real-world quantum information technologies requires precise nanofabrication platforms with high process yield. Self-assembled semiconductor quantum dots with excellent emission properties have proven to be among the best candidates to meet the needs of a number of novel quantum photonic devices. However, their spatial and spectral positions vary statistically on a scale that is far too large for their system integration via fixed lithography and inflexible processing schemes. We solve this severe problem by introducing a flexible and deterministic manufacturing scheme based on precise and convenient cathodoluminescence spectroscopy followed by high-resolution electron-beam lithography. The basics and application examples of this advanced in situ electron-beam lithography are described in this article. Although we focus here on quantum dots as photon emitters, this nanotechnology concept is very well suited for the fabrication of a variety of quantum nanophotonic devices based on quantum emitters that exhibit suitably strong cathodoluminescence signals.
title: Front Matter, Table of Contents, Preface, Conference Organization
Creators: name: Karlin, Anna R.
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2018
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Conference Organization

description: Front Matter, Table of Contents, Preface, Conference Organization
description: LIPIcs, Vol. 94, 9th Innovations in Theoretical Computer Science Conference (ITCS 2018), pages 0:i-0:xii
Classification and realizations of type III factor representations of Cuntz-Krieger algebras associated with quasi-free states
Creators: name: Kawamura, Katsunori
Publisher: name: arXiv
Year: 2008
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 46K10; 46L30

description: We completely classify type III factor representations of Cuntz-Krieger algebras associated with quasi-free states up to unitary equivalence. Furthermore, we realize these representations on concrete Hilbert spaces without using GNS construction. Free groups and their type ${\rm II}_{1}$ factor representations are used in these realizations.
description: 11 pages
Surface Flow Visualization Techniques
Creators: name: Eck, Mario
name: Rückert, Roland
name: Tüzüner, Ergin
name: Mihalyovics, Jan
Publisher: name: Zenodo
Year: 2021
Subjects: Flow visualization
Surface flow
Surface fence probe
Sublayer fence probe
Oil flow visualization
Streaklines
Wall shear stress
Skin friction
Axial compressor flow
Turbomachinery

description: Surface flow visualization techniques like the oil-and-dye technique provide information about the flow around a model that is to be investigated. Based on the assumption that the oil paint is being distributed along lines corresponding to the direction of the wall shear stress, the resulting streakline pattern allows identifying laminar-turbulent transition of the boundary layer and regions of separated flows. A complementary measurement technique, that is, a so-called surface fence probe embedded flush to the model's surface, allows determining the wall shear stress in magnitude and direction. Both techniques have been employed in the hub-side gap area of an annular compressor stator and the tip gap of a compressor rotor. For the stator, the streakline pattern computed from the surface fence probe data shows remarkable similarities with the digitized oil flow pattern. Using the fence's velocity vector field, a considerable gain of information about flow quantities like the divergence or the vorticity can be achieved. The rotor experiments provide evidence that if the fence is equipped with time-resolved pressure transducers, the flow vector's fluctuation values in magnitude and direction can be ascertained. This unique feature provides the ability to obtain the streakline pattern of the relative flow field on the casing wall as if the oil-and dye technique had been carried out in the rotor reference system.
Tracing PAH Size in Prominent Nearby Mid-Infrared Environments
Creators: name: Knight, C.
name: Peeters, E.
name: Stock, D. J.
name: Vacca, W. D.
name: Tielens, A. G. G. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present observations from the First Light Infrared TEst CAMera (FLITECAM) on board the Stratospheric Observatory for Infrared Astronomy (SOFIA), the Spitzer Infrared Array Camera (IRAC) and the Spitzer Infrared Spectrograph (IRS) SH mode in three well-known Photodissocation Regions (PDRs), the reflection nebulae (RNe) NGC 7023 and NGC 2023 and to the southeast of the Orion Bar, which are well suited to probe emission from Polycyclic Aromatic Hydrocarbon molecules (PAHs). We investigate the spatial behaviour of the FLITECAM 3.3 um filter as a proxy for the 3.3 um PAH band, the integrated 11.2 um PAH band, and the IRAC 8.0 um filter as a proxy for the sum of the 7.7 and 8.6 um PAH bands. The resulting ratios of 11.2/3.3 and IRAC 8.0/11.2 provide an approximate measure of the average PAH size and PAH ionization respectively. In both RNe, we find that the relative PAH ionization and the average PAH size increases with decreasing distance to the illuminating source. The average PAH sizes derived for NGC 2023 are greater than those found for NGC 7023 at all points. Both results indicate that PAH size is dependent on the radiation field intensity. These results provide additional evidence of a rich carbon-based chemistry driven by the photo-chemical evolution of the omnipresent PAH molecules within the interstellar medium. In contrast, we did not detect a significant variation in the average PAH size found in the region southeast of the Orion Bar and report a peculiar PAH ionization radial profile.
description: 20 pages, 11 figures, accepted for publication in ApJ
TAQQOSLAMA VA UNING XOSSALARIGA DOIR MISOL VA MASALALAR YECHISH
Creators: name: Zaxiriddinova, Shahlo
name: Ulug`murodova, Shaxlo
Publisher: name: Zenodo
Year: 2025

description: Maqolada taqqoslash jarayonlarining maqsadi, obyektlar yoki jarayonlarning  o'zaro  bog'liqliklarini  tushuntirib  chiqish  va  buning  natijasida ma'lumotlar olish, aniqlasho’rganilgan.
Physics and Applications of High‐β Micro‐ and Nanolasers
Creators: name: Deng, Hui
name: Lippi, Gian Luca
name: Mørk, Jesper
name: Wiersig, Jan
name: Reitzenstein, Stephan
Publisher: name: Technische Universität Berlin
Year: 2021
Subjects: subject: 530 Physik
subject: Fano lasers
subject: high-β lasers
subject: microlasers
subject: nanolasers
subject: neuromorphic computing
subject: quantum nanophotonics
subject: thresholdless lasing

description: Micro- and nanolasers are emerging optoelectronic components with many properties still to be explored and understood. On the one hand, they make it possible to address fundamental physical questions in the border area between classical physics and quantum physics, on the other hand, they open up new application perspectives in many areas of photonics. This progress report provides an overview of the exciting developments from conventional semiconductor lasers toward nanoscale lasers, whose function relies on increased light–matter interaction in low-mode-volume resonators and unconventional gain concepts. The latest advances in the physical understanding of light emission from high-β lasers, in which a large part of the spontaneous emission is coupled into the laser mode, are highlighted. In the limit of β = 1, this leads to thresholdless lasing and it is shown that quantum optical characterization is required to fully explore the underlying emission processes. In addition, emerging nanolaser concepts based on Fano resonators, topological photonics, and 2D materials are presented. Open questions, future prospects, and application scenarios of high-β lasers in integrated photonics, quantum nanophotonics, and neuromorphic computing are discussed.
Arrenurus (Brevicaudaturus) multicornutus Walter 1915
Creators: name: Smit, Harry
Publisher: name: Zenodo
Year: 2004
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Arrenuridae
Arrenurus
Arrenurus multicornutus

description: Arrenurus (Brevicaudaturus) multicornutus Walter, 1915
 Arrenurus multicornutus Walter, 1915: 118.
 Arrenurus (Megaluracarus) multicornutus Walter: Cook 1957: 76; Wiles 1988: 499. Arrenurus (Brevicaudaturus) multicornutus Walter: Smit 1997: 253; Smit 2003b. Arrenurus tricornutus K. Viets, 1955: 25.
 Arrenurus (Megaluracarus) tricornutus K. Viets: K.O. Viets 1975: 93; Smit 1992: 106. Arrenurus (Brevicaudaturus) tricornutus K. Viets: Smit 1997: 253; Harvey 1998: 144. Arrenurus (Brevicaudaturus) lohmanni (err., non Piersig, 1898): Smit 1997: 253 [part., &&].
 Material examined
Western Samoa: 19 males, 10 females, 9 nymphs, pool near Lalomanu, Upolu, 14º 0 2.650 S, 171º 28.079 W, 14 m a.s.l., 11 October 2003; 3 males, 3 females, 2 nymphs, pool in river bed, Saapapalii, Savaii, 13º 41.820 S, 172º 12.080 W, 14 October 2003; 1 male, pools in river bed, west of Vaiola, Savaii, 13º 38.925 S, 172º 14.910 W, 17 October 2003; 2 females, pool along Vaiola Road, 2 km north of Vaiola, Savaii, 13º 39.620 S, 172º 14.351 W, 17 October 2003; 1 male, rock pools along Vaiola Road, Savaii, 13º 38.357 S, 172º 15.352 W, 62 m a.s.l., 18 October 2003.
 Remarks
 Arrenurus multicornutus is widespread and reported from Fiji, New Caledonia, Yap, Australia and the Malay Peninsula. It is reported here for the first time from Western Samoa.
description: Published as part of Smit, Harry, 2004, Water mites from Pacific Islands (Acari: Hydrachnidia), pp. 1-20 in Zootaxa 588 on page 19, DOI: 10.5281/zenodo.157984
Evidence for a Photoevaporated Circumbinary Disk in Orion
Creators: name: Robberto, M.
name: Ricci, L.
name: Da Rio, N.
name: Soderblom, D. R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have found a photoevaporated disk in the Orion Nebula that includes a wide binary. HST/ACS observations of the proplyd 124-132 show two point-like sources separated by 0".15, or about 60 AU at the distance of Orion. The two sources have nearly identical I and z magnitudes. We analyze the brightest component, Source N, comparing the observed magnitudes with those predicted using a 1 Myr Baraffe/NEXTGEN isochrone with different accretion luminosities and extinctions. We find that a low mass (\simeq 0.04 M_\odot) brown dwarf ~1 Myr old with mass accretion rate \log\dot{M}\simeq -10.3, typical for objects of this mass, and about 2 magnitudes of visual extinction provides the best fit to the data. This is the first observation of a circumbinary disk undergoing photoevaporation and, if confirmed by spectroscopic observations, the first direct detection of a wide substellar pair still accreting and enshrouded in its circumbinary disk.
description: 13 pages, 2 tables, 5 figures; accepted for publication in ApJL
Detection of continuous variable entanglement without coherent local oscillators
Creators: name: Ferris, A. J.
name: Olsen, M. K.
name: Cavalcanti, E. G.
name: Davis, M. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose three criteria for identifying continuous variable entanglement between two many-particle systems with no restrictions on the quantum state of the local oscillators used in the measurements. Mistakenly asserting a coherent state for the local oscillator can lead to incorrectly identifying the presence of entanglement. We demonstrate this in simulations with 100 particles, and also find that large number fluctuations do not prevent the observation of entanglement. Our results are important for quantum information experiments with realistic Bose-Einstein condensates or in optics with arbitrary photon states.
description: 7 Pages, 4 Figures
Compact cryogenic Kerr microscope for time-resolved studies of electron spin transport in microstructures
Creators: name: Rizo, P. J.
name: Pugžlys, A.
name: Liu, J.
name: Reuter, D.
name: Wieck, A. D.
name: van der Wal, C. H.
name: van Loosdrecht, P. H. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A compact cryogenic Kerr microscope for operation in the small volume of high-field magnets is described. It is suited for measurements both in Voigt and Faraday configuration. Coupled with a pulsed laser source, the microscope is used to measure the time-resolved Kerr rotation response of semiconductor microstructures with ~1 micron spatial resolution. The microscope was designed to study spin transport, a critical issue in the field of spintronics. It is thus possible to generate spin polarization at a given location on a microstructure and probe it at a different location. The operation of the microscope is demonstrated by time-resolved measurements of micrometer distance diffusion of spin polarized electrons in a GaAs/AlGaAs heterojunction quantum well at 4.2 K and 7 Tesla.
Mostri nebulosi ai raggi infrarossi
Creators: Valentina Guglielmo
Publisher: name: Media Inaf
Year: 2021

Una nebulosa sul piano della Via Lattea, una regione luminosa a 7800 anni luce dalla Terra e due stelle dalla distanza sconosciuta: sono questi i puntini da unire per disegnare uno spaventoso Godzilla cosmico. A scorgerlo, la fantasia di un astronomo della missione Spitzer della Nasa, che ha scattato queste ed altre spettacolari nebulose nella nostra galassia
In arrivo un’intensa tempesta geomagnetica
Creators: Maura Sandri
Publisher: name: Media Inaf
Year: 2021

Nel tardo pomeriggio di ieri il Sole ha emesso un brillamento solare di classe X1.0, ossia molto intenso. Il rilascio impulsivo di energia ha prodotto lampi di fotoni a diverse lunghezze d'onda, e ha accelerato una bolla di plasma magnetizzato il cui arrivo sulla Terra è previsto per domani, 30 ottobre. «Comprimerà il campo geomagnetico e inietterà particelle energetiche nella magnetosfera terrestre, causando una tempesta geomagnetica intensa e aurore polari», commenta Mauro Messerotti dell’Inaf
Raggi X allo specchio
Creators: Rossella Spiga
Publisher: name: Media Inaf
Year: 2021

Una tecnica di nanometrologia elaborata in collaborazione tra l’università di Oxford e il sincrotrone Diamond permetterà di raggiungere una precisione senza precedenti nella caratterizzazione di specchi per raggi X – dispositivi fondamentali anche nel campo dell’astrofisica spaziale per le alte energie. Media Inaf ha intervistato Simone Moriconi, uno degli autori dell’articolo pubblicato su Nature Light: Science & Applications
Lucy è stabile in modalità crociera
Creators: Maura Sandri
Publisher: name: Media Inaf
Year: 2021

La sonda spaziale Lucy è in viaggio, in modalità crociera. Il veicolo spaziale ha eseguito con successo diverse manovre pianificate, che non hanno avuto effetti negativi sull'unico pannello solare che non è riuscito a dispiegarsi completamente, bensì solo tra il 75 e il 95 per cento. Un eventuale tentativo di dispiegamento del pannello solare in sicurezza si verificherà non prima del 16 novembre
Come trovare oceani nascosti su mondi lontani
Creators: Maura Sandri
Publisher: name: Media Inaf
Year: 2021

Un nuovo studio mostra come le sostanze chimiche nell'atmosfera di un esopianeta possono, in alcuni casi, rivelare se la temperatura sulla sua superficie è troppo alta per l'acqua liquida. In particolare, lo studio mostra quali sostanze chimiche potrebbero indicare la presenza di oceani nascosti su mondi il cui diametro va da 1.7 e 3.5 volte quello terrestre, i cosiddetti sub-nettuniani. Tutti i dettagli su ApJ Letters
Ecco per la prima volta l’atmosfera di Giove in 3D
Creators: Ufficio stampa Inaf
Publisher: name: Media Inaf
Year: 2021

La missione Juno della Nasa attorno al più grande pianeta del Sistema solare, che vede anche un importante contributo scientifico e tecnologico dell’Italia, sta svelando con un dettaglio senza precedenti ciò che accade sotto le enormi nuvole del gigante gassoso. Alessandro Mura (Inaf): «Risultati cruciali per la nostra comprensione dei pianeti giganti come Giove»
Com’è profonda la Grande Macchia Rossa
Creators: Marco Malaspina
Publisher: name: Media Inaf
Year: 2021

Due studi appena pubblicati su Science, basati entrambi su dati ottenuti con la sonda Juno, offrono – attraverso metodi complementari – stime sulla profondità dell’iconico vortice di Giove. Uno dei due è riuscito a “spingersi” fino a 500 km avvalendosi delle misure di gravità. Abbiamo intervistato la prima autrice, Marzia Parisi, ricercatrice romana oggi in California, al Jet Propulsion Laboratory della Nasa
Primi passi verso l’intelligenza artificiale quantistica
Creators: Maura Sandri
Publisher: name: Media Inaf
Year: 2021

Una nuova ricerca condotta da un team del Los Alamos National Laboratory dimostra che le Quantum Convolutional Neural Networks (Qcnn) non presentano il problema del Barren Plateau. Secondo Nicolò Parmiggiani (Inaf), i due teoremi dimostrati nello studio uscito su Physical Review X sono molto importanti per garantire l’applicabilità delle Qcnn e per il futuro delle reti neurali quantistiche
Possibile pianeta extragalattico in M51
Creators: Marco Malaspina
Publisher: name: Media Inaf
Year: 2021

È grande come Saturno. Orbita ogni 70 anni attorno a una binaria X a 28 milioni di anni luce da noi, nella Galassia Vortice. Gli indizi della sua esistenza arrivano dalle misure compiute con i telescopi spaziali Chandra e Xmm-Newton per raggi X, e se confermato sarebbe il primo pianeta mai scoperto al di fuori della nostra galassia
New parameterization of the resonant production amplitudes near an inelastic threshold
Creators: name: Lesniak, L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: New formulae for the resonant scattering and the production amplitudes near an inelastic threshold are derived. It is shown that the Flatte formula, frequently used in experimental analyses, is not sufficiently accurate. Its application to data analysis can lead to a substantial distortion of the effective mass spectra and of the resonance pole positions. A unitary parameterization, satisfying a generalized Watson theorem for the production amplitudes, is proposed. It can be easily applied to study production processes, multichannel meson-meson interactions and the resonance properties, including among others the scalar resonances a0(980) and f_0(980).
description: 4 pages, 1 figure, contribution to MESON 2008, Tenth International Workshop on Meson Production, Properties and Interaction, 6-10 June, Krakow, Poland, to be published in International Journal of Modern Physics A
Zoom su Epsilon Eridani, alla ricerca della Terra 2.0
Creators: Maura Sandri
Publisher: name: Media Inaf
Year: 2021

Un team internazionale di ricercatori ha sviluppato una nuova tecnica basata sull’utilizzo combinato di dati provenienti da telescopi terrestri e spaziali, per riuscire a distinguere i segnali provenienti da stelle da quelli provenienti da pianeti in orbita intorno a quelle stelle. Il metodo verrà applicato anche a una serie di osservazioni interferometriche per visualizzare direttamente la superficie di una stella. Lo studio è in corso di pubblicazione su ApJ
Sulle tracce delle onde gravitazionali ultrabasse
Creators: Ufficio stampa Inaf
Publisher: name: Media Inaf
Year: 2021

Analizzato in dettaglio un segnale promettente che potrebbe essere dovuto al cosiddetto fondo di onde gravitazionali prodotto dall’energia gravitazionale rilasciata da coppie di buchi neri supermassicci in reciproco avvicinamento. Lo studio, a cui hanno partecipato anche ricercatrici e ricercatori dell’Inaf, rappresenta un passo avanti sulla strada della rivelazione di onde gravitazionali di frequenza molto bassa, dell'ordine di un miliardesimo di Hertz.
A 15.5 GHz detection of the galaxy cluster minihalo in RXJ1720.1+2638
Creators: name: Perrott, Yvette C.
name: Carvalho, Pedro
name: Elwood, Patrick J.
name: Grainge, Keith J. B.
name: Green, David A.
name: Javid, Kamran
name: Jin, Terry Z.
name: Rumsey, Clare
name: Saunders, Richard D. E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: RXJ1720.1+2638 is a cool-core, 'relaxed-appearing' cluster with a minihalo previously detected up to 8.4 GHz, confined by X-ray-detected cold fronts. We present observations of the minihalo at 13 - 18 GHz with the Arcminute Microkelvin Imager telescope, simultaneously modelling the Sunyaev-Zel'dovich signal of the cluster in conjunction with Planck and Chandra data in order to disentangle the non-thermal emission of the minihalo. We show that the previously-reported steepening of the minihalo emission at 8.4 GHz is not supported by the AMI data and that the spectrum is consistent with a single power-law up to 18 GHz. We also show the presence of a larger-scale component of the minihalo extending beyond the cold fronts. Both of these observations could be explained by the 'hadronic' or 'secondary' mechanism for the production of relativistic electrons, rather than the currently-favoured 're-acceleration' mechanism and/or multiple episodes of jet activity from the active galactic nucleus in the brightest cluster galaxy.
description: 19 pages, 16 figures, accepted to MNRAS
title: Stimulated Brillouin scattering: its generation and applications in optical fibre
Creators: name: Culverhouse, David
Publisher: name: University of Kent
Year: 2021

description: In the work presented in this thesis, the generation of stimulated Brillouin scattering and its applications in optical fibres is theoretically and experimentally investigated. The study pursues three special cases: i) Backward stimulated Brillouin scattering in long fibre lengths ii) Backward stimulated Brillouin scattering in high finesse all fibre ring resonators iii) Forward stimulated Brillouin scattering in dual moded single core fibres. Stimulated Brillouin scattering (SBS) occurs for relatively low input powers in monomode optical fibres, as the power density is very high because of the relatively small core size. For applications such as optical communications, SBS is seen as a potentially deleterious effect because it can limit the maximum optical power transmitted by the fibre and hence decrease the distance between repeaters. SBS, however, can also be used to advantage in optical fibres, for example to produce amplification. In this thesis the comprehensive study of SBS in relation to other non-linear scattering mechanisms in optical fibres leads to the derivation of explicit definitions for the Brillouin gain and the Brillouin threshold. The study of SBS in high finesse all fibre ring resonators also demonstrates how threshold powers can be reduced, typically, from milliwatts observed in long fibre lengths to microwatts. Because Brillouin scattering is primarily a result of the interaction of the incident optical beam with spontaneously generated (thermal) fluctuations in the density of the medium, the spectral features show a considerable variation with temperature thus providing a mechanism with sufficient sensitivity to realise tunable microwave generation and frequency shifting devices. Finally, the observation of stimulated Brillouin scattering in a forward direction (FSBS) in dual moded single-core fibre is also reported. Frequency shifts in the order of 17MHz are observed in optical fibre supporting LP\(_{01}\) and LP\(_{11}\) modes at 514.5nm. The phenomenon is examined here in detail and the governing differential equations of the three wave parametric process (involving pump/laser, Brillouin signal and acoustic flexural wave phonon) is derived and solved. FSBS is possible because, although the overlap integral between a fibre flexural mode and the light is small, the phonon lifetime is much longer than in conventional SBS. FSBS may also be the first example of a non-linear effect which is enhanced by increasing the optical mode area at constant pump power.
Le “miniere d’oro” dell’universo
Creators: Maura Sandri
Publisher: name: Media Inaf
Year: 2021

Un gruppo di tre ricercatori del Mit e dell'Università del New Hampshire ha scoperto che le fusioni di stelle di neutroni potrebbero generare da 2 a 100 volte più metalli pesanti rispetto alle fusioni tra stelle di neutroni e buchi neri. La stima deriva dall’analisi di quattro fusioni di oggetti compatti osservate con Ligo e Virgo e si riferisce agli ultimi 2.5 miliardi di anni. Tutti i dettagli su ApJ Letters
Elasticity of a polydisperse hard-sphere crystal
Creators: name: Yang, Mingcheng
name: Ma, Hongru
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A general Monte Carlo simulation method of calculating the elastic constants of polydisperse hard-sphere colloidal crystal was developed. The elastic constants of a size polydisperse hard sphere fcc crystal is calculated. The pressure and three elastic constants(C11, C12 and C44) increase significantly with the polydispersity. It was also found from extrapolation that there is a mechanical terminal polydispersity above which a fcc crystal will be mechanically unstable.
description: 17 pages, 3 figures
Dynamical simulations of charged soliton transport in conjugated polymers with the inclusion of electron-electron interactions
Creators: name: Ma, Haibo
name: Schollwoeck, Ulrich
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present numerical studies of the transport dynamics of a charged soliton in conjugated polymers under the influence of an external time-dependent electric field. All relevant electron-phonon and electron-electron interactions are nearly fully taken into account by simulating the monomer displacements with classical molecular dynamics (MD) and evolving the wavefunction for the $π$ electrons by virtue of the adaptive time-dependent density matrix renormalization group (TDDMRG) simultaneously and nonadiabatically. It is found that after a smooth turn-on of the external electric field the charged soliton is accelerated at first up to a stationary constant velocity as one entity consisting of both the charge and the lattice deformation. An ohmic region (6 mV/$\textÅ$ $\leq E_0\leq$ 12 mV/$\textÅ$) where the stationary velocity increases linearly with the electric field strength is observed. The relationship between electron-electron interactions and charged soliton transport is also investigated in detail. We find that the dependence of the stationary velocity of a charged soliton on the on-site Coulomb interactions $U$ and the nearest-neighbor interactions $V$ is due to the extent of delocalization of the charged soliton defect.
description: 25 pages, 15 figures
Phase signatures in third-harmonic response of Higgs and coexisting modes in superconductors
Creators: name: Schwarz, Lukas
name: Haenel, Rafael
name: Manske, Dirk
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Third-harmonic generation (THG) experiments on superconductors can be used to investigate collective excitations like the amplitude mode of the order parameter known as Higgs mode. These modes are visible due to resonances in the THG signal if the driving frequency matches the energy of the mode. In real materials multiple modes can exist giving rise to additional THG contributions, such that it is difficult to unambiguously interpret the results. In this paper, we additionally analyze the phase of the THG signal, which contains microscopic details beyond classical resonances as well as signatures of couplings between modes which are difficult to observe in the amplitude alone. We investigate how the Higgs mode, impurities or Coulomb interaction affects the phase response and consider exemplary two systems with additional modes. We argue that extracting this phase information could be valuable in future experiments.
description: 22 pages, 10 figures
The Hudson’s Bay Company’s contribution to the work of three important artists in their territory, 1821-1860
Creators: name: Stewart, Susan Jane Hopkins
Publisher: name: University of British Columbia
Year: 2010

description: Through the study of archival documents and published source material this thesis addresses the relationships between the Hudson's Bay Company and three major artists of the Canadian frontier in the mid Nineteenth century. The objective was to enlarge our understanding of the forces which shaped the artistic records of what is now Western Canada by examining the assistance given to artists by the most influential institution in the region. Three major artists, were selected as case studies: Peter Rindisbacher, Henry Warre and Paul Kane. Each artist was dependent upon the Company in a different way. Past accounts have underestimated the importance of H.B.C. aid to the success of Kane's and Rindisbacher's work. Henry Warre's relationship to the Company was less successful than the dedication of his Sketches in North America and the Oregon Territory to the Governor and Committee of the Hudson's Bay Company would suggest. The Company was a significant force in the frontier. Their contribution consisted mainly of providing transportation, guides, supplies and lodging to the artists as well as to scientific expeditions. Although the Company was first and foremost a fur trading institution, it was sincerely interested in art, and made major contributions to the advancement of knowledge about North America, Motivations for this assistance included a traditional interest in art, enhancement of the Company's image, the initiative of influential employees, and a desire to augment their museum collections with appropriate artworks from the Company territory.
Un proto-ammasso di galassie prodigioso
Creators: Ufficio stampa Inaf
Publisher: name: Media Inaf
Year: 2021

Lo studio, guidato da Mari Polletta dell’Istituto nazionale di astrofisica e basato su osservazioni effettuate con il Large Binocular Telescope, ha scoperto un proto-ammasso di galassie proprio grazie al suo tasso di formazione stellare sorprendente rispetto a quanto previsto dalle simulazioni cosmologiche
Fiocco azzurro a 400 anni luce dalla Terra
Creators: Gloria Nobile
Publisher: name: Media Inaf
Year: 2021

Si chiama 2M0437 b e muove da poco i primi passi. Visto per la prima volta nel 2018 con il telescopio Subaru, è uno fra i rari pianeti extrasolari che si possono osservare direttamente, nonché uno fra i più giovani mai scoperti. Caratteristiche che insieme lo rendono un mondo del tutto speciale. La conferma della sua natura arriva ora dall’Università delle Hawaii, grazie alla collaborazione di scienziati e di studenti di Mānoa. La scoperta sarà pubblicata su Mnras