cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Integrazione delle Fonti Rinnovabili nelle SMART-GRID
Creators: name: Massa, Giovanni
Publisher: name: Universita degli studi di Salerno
Year: 2013
Subjects: subject: ING-IND/33 SISTEMI ELETTRICI PER L'ENERGIA
subject: Distributed generation
subject: Smart grid
subject: Voltage control

description: 2011 - 2012
description: Energy market liberalization processes and incentive programs by various National governmwnts are driving an increasing diffusion of a wide variety of Distributed Generation (DG) powe plants, causing huge changes and challenges in Electrical Power Systems (EPS). in fact, while in the past the power generation was mainly concentrated in a small number of large power plants directly connected to the high voltage Transmission Networks (TNs), DG units can be connected directly to Disribution Networks (DNs), causing both DNs planning and management issues. Thus, innovative planning and management approaches of these new active networks are necessary to ensure the best integration of Distributed Energy Resources (DERs) within EPSs as well as TNs and DNs optimal use. The thesis work addresses these aspects by investigating DERs integration issues and their impact on voltage profiles within DNs. The work proposes a technique for DERs decentralized control at the Point of Commom Coupling (PCC) with the DN, designed to contain voltage variations within regulatory limits and to maximize active power delivery to the grid... [edited by Author]
description: La sempre maggior diffusione dei sistemi di generazione distribuita, anche di dimensioni medio-piccole, legata da un lato ai processi di liberalizzazione dei mercati dell’energia e dall’altro alle incentivazioni all’impiego di fonti rinnovabili promosse da vari Paesi, sta profondamente modificando la struttura del sistema elettrico. Infatti, mentre in passato la generazione era principalmente concentrata in un numero ristretto di centrali di grandi dimensioni direttamente connesse alle reti di trasporto in alta e altissima tensione, la generazione distribuita può avvenire anche in corrispondenza dello stesso utente finale direttamente sulla rete di distribuzione, con problemi tanto di pianificazione che di gestione dell’intera rete elettrica. Si rendono, pertanto, necessari nuovi approcci per la pianificazione e la gestione delle reti di distribuzione attive, atti a garantire la migliore integrazione possibile di tali risorse, sia in termini di massima producibilità degli impianti di generazione e sia di impiego ottimo delle reti di trasmissione e distribuzione. Di tali aspetti si occupa il presente lavoro di tesi, investigando le problematiche connesse all’integrazione dei sistemi di generazione distribuita all’interno delle reti elettriche di distribuzione e al loro impatto sui profili di tensione, proponendo una tecnica di controllo decentralizzato dei punti di connessione tra i generatori e la rete finalizzata al contenimento delle variazioni di tensione e alla massimizzazione dell’energia immessa in rete... [a cura dell'Autore]
The Gaia-ESO Survey: Chemical evolution of Mg and Al in the Milky Way with Machine-Learning
Creators: name: Ambrosch, M.
name: Guiglion, G.
name: Mikolaitis, Š.
name: Chiappini, C.
name: Tautvaišienė, G.
name: Nepal, S.
name: Gilmore, G.
name: Randich, S.
name: Bensby, T.
name: Bergemann, M.
name: Morbidelli, L.
name: Pancino, E.
name: Sacco, G. G.
name: Smiljanic, R.
name: Zaggia, S.
name: Jofré, P.
name: Jiménez-Esteban, F. M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We aim to prepare the machine-learning ground for the next generation of spectroscopic surveys, such as 4MOST and WEAVE. Our goal is to show that convolutional neural networks can predict accurate stellar labels from relevant spectral features in a physically meaningful way. We built a neural network and trained it on GIRAFFE spectra with associated stellar labels from the sixth internal Gaia-ESO data release. Our neural network predicts the atmospheric parameters Teff and log(g) as well as the chemical abundances [Mg/Fe], [Al/Fe], and [Fe/H] for 30115 stellar spectra. The scatter of predictions from eight slightly different network models shows a high internal precision of the network results: 24 K for Teff, 0.03 for log(g), 0.02 dex for [Mg/Fe], 0.03 dex for [Al/Fe], and 0.02 dex for [Fe/H]. The network gradients reveal that the network is inferring the labels in a physically meaningful way from spectral features. Validation with benchmark stars and several scientific applications confirm that our network predictions are accurate for individual stars and recover the properties of different stellar populations in the Milky Way galaxy. Such a study provides very good insights into the application of machine-learning for the spectral analysis of large-scale spectroscopic surveys, such as WEAVE and 4MIDABLE-LR and -HR (4MOST Milky Way disk and bulge low- and high-resolution). The community will have to put a substantial effort into building proactive training sets for machine-learning methods to minimize the possible systematics.
description: Submitted to A&A
Galaxy and Mass Assembly (GAMA): merging galaxies and their properties
Creators: name: De Propris, Roberto
name: Baldry, Ivan K.
name: Bland-Hawthorn, Joss
name: Brough, Sarah
name: Driver, Simon P.
name: Hopkins, Andrew M.
name: Kelvin, Lee
name: Loveday, Jon
name: Phillipps, Steve
name: Robotham, Aaron
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We derive the close pair fractions and volume merger rates as a function of luminosity and morphology for galaxies in the GAMA survey with -23 < M(r) < -17 at 0.01 < z < 0.22. The merger fraction is about 0.015 at all luminosities (assuming 1/2 of pairs merge) and the volume merger rate is about 0.00035 per cubic Mpc per Gyr. Dry mergers (between red or spheroidal galaxies) are uncommon and decrease with decreasing luminosity. Fainter mergers are wet, between blue or disky galaxies. Damp mergers (one of each type) follow the average of dry and wet mergers. In the brighter luminosity bin (-23 < M(r) < -20) the merger rate evolution is flat, irrespective of colour or morphology. The makeup of the merging population does not change since z = 0.2. Major mergers and dry mergers appear comparatively unimportant in the buildup of the red sequence over the past 2 Gyr. We compare the colour, morphology, environmental density and degree of activity of galaxies in pairs to those of more isolated objects in the same volume. Galaxies in close pairs tend to be both redder and slightly more spheroid-dominated. This may be due to "harassment" in multiple previous passes prior to the current interaction. Galaxy pairs do not appear to prefer significantly denser environments. There is no evidence of an enhancement in the AGN fraction in pairs, compared to other galaxies in the same volume.
description: 14 pages, 8 figures, MNRAS accepted
VLBI observations of bright AGN jets with KVN and VERA Array (KaVA): Evaluation of Imaging Capability
Creators: name: Niinuma, Kotaro
name: Lee, Sang-Sung
name: Kino, Motoki
name: Sohn, Bong Won
name: Akiyama, Kazunori
name: Zhao, Guang-Yao
name: Sawada-Satoh, Satoko
name: Trippe, Sascha
name: Hada, Kazuhiro
name: Jung, Taehyun
name: Hagiwara, Yoshiaki
name: Dodson, Richard
name: Koyama, Shoko
name: Honma, Mareki
name: Nagai, Hiroshi
name: Chung, Aeree
name: Doi, Akihiro
name: Fujisawa, Kenta
name: Han, Myoung-Hee
name: Kim, Joeng-Sook
name: Lee, Jeewon
name: Lee, Jeong Ae
name: Miyazaki, Atsushi
name: Oyama, Tomoaki
name: Sorai, Kazuo
name: Wajima, Kiyoaki
name: Bae, Jaehan
name: Byun, Do-Young
name: Cho, Se-Hyung
name: Choi, Yoon Kyung
name: Chung, Hyunsoo
name: Chung, Moon-Hee
name: Han, Seog-Tae
name: Hirota, Tomoya
name: Hwang, Jung-Wook
name: Je, Do-Heung
name: Jike, Takaaki
name: Jung, Dong-Kyu
name: Jung, Jin-Seung
name: Kang, Ji-Hyun
name: Kang, Jiman
name: Kang, Yong-Woo
name: Kan-ya, Yukitoshi
name: Kanaguchi, Masahiro
name: Kawaguchi, Noriyuki
name: Kim, Bong Gyu
name: Kim, Hyo Ryoung
name: Kim, Hyun-Goo
name: Kim, Jaeheon
name: Kim, Jongsoo
name: Kim, Kee-Tae
name: Kim, Mikyoung
name: Kobayashi, Hideyuki
name: Kono, Yusuke
name: Kurayama, Tomoharu
name: Lee, Changhoon
name: Lee, Jung-Won
name: Lee, Sang Hyun
name: Minh, Young Chol
name: Matsumoto, Naoko
name: Nakagawa, Akiharu
name: Oh, Chung Sik
name: Oh, Se-Jin
name: Park, Sun-Youp
name: Roh, Duk-Gyoo
name: Sasao, Tetsuo
name: Shibata, Katsunori M.
name: Song, Min-Gyu
name: Tamura, Yoshiaki
name: Wi, Seog-Oh
name: Yeom, Jae-Hwan
name: Yun, Young Joo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The Korean very-long-baseline interferometry (VLBI) network (KVN) and VLBI Exploration of Radio Astrometry (VERA) Array (KaVA) is the first international VLBI array dedicated to high-frequency (23 and 43 GHz bands) observations in East Asia. Here, we report the first imaging observations of three bright active galactic nuclei (AGNs) known for their complex morphologies: 4C 39.25, 3C 273, and M 87. This is one of the initial result of KaVA early science. Our KaVA images reveal extended outflows with complex substructure such as knots and limb brightening, in agreement with previous Very Long Baseline Array (VLBA) observations. Angular resolutions are better than 1.4 and 0.8 milliarcsecond at 23 GHz and 43 GHz, respectively. KaVA achieves a high dynamic range of ~1000, more than three times the value achieved by VERA. We conclude that KaVA is a powerful array with a great potential for the study of AGN outflows, at least comparable to the best existing radio interferometric arrays.
description: 15 pages, 10 figures, 6 tables, accepted for publication in PASJ
Spectroscopic accuracy directly from quantum chemistry: application to ground and excited states of beryllium dimer
Creators: name: Sharma, Sandeep
name: Yanai, Takeshi
name: Booth, George H.
name: Umrigar, C. J.
name: Chan, Garnet Kin-Lic
Publisher: name: arXiv
Year: 2014
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Atomic Physics (physics.atom-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We combine explicit correlation via the canonical transcorrelation approach with the density matrix renormalization group and initiator full configuration interaction quantum Monte Carlo methods to compute a near-exact beryllium dimer curve, {\it without} the use of composite methods. In particular, our direct density matrix renormalization group calculations produce a well-depth of $D_e$=931.2 cm$^{-1}$ which agrees very well with recent experimentally derived estimates $D_e$=929.7$\pm 2$~cm$^{-1}$ [Science, 324, 1548 (2009)] and $D_e$=934.6~cm$^{-1}$ [Science, 326, 1382 (2009)]], as well the best composite theoretical estimates, $D_e$=938$\pm 15$~cm$^{-1}$ [J. Phys. Chem. A, 111, 12822 (2007)] and $D_e$=935.1$\pm 10$~cm$^{-1}$ [Phys. Chem. Chem. Phys., 13, 20311 (2011)]. Our results suggest possible inaccuracies in the functional form of the potential used at shorter bond lengths to fit the experimental data [Science, 324, 1548 (2009)]. With the density matrix renormalization group we also compute near-exact vertical excitation energies at the equilibrium geometry. These provide non-trivial benchmarks for quantum chemical methods for excited states, and illustrate the surprisingly large error that remains for 1$^1Σ^-_g$ state with approximate multi-reference configuration interaction and equation-of-motion coupled cluster methods. Overall, we demonstrate that explicitly correlated density matrix renormalization group and initiator full configuration interaction quantum Monte Carlo methods allow us to fully converge to the basis set and correlation limit of the non-relativistic Schrödinger equation in small molecules.
Intensified tuberculosis treatment to reduce the mortality of HIV-infected and uninfected patients with tuberculosis meningitis (INTENSE-TBM): study protocol for a phase III randomized controlled trial.
Creators: name: Maitre, Thomas
name: Bonnet, Maryline
name: Calmy, Alexandra
name: Raberahona, Mihaja
name: Rakotoarivelo, Rivonirina Andry
name: Rakotosamimanana, Niaina
name: Ambrosioni, Juan
name: Miró, José M
name: Debeaudrap, Pierre
name: Muzoora, Conrad
name: Davis, Angharad
name: Meintjes, Graeme
name: Wasserman, Sean
name: Wilkinson, Robert
name: Eholié, Serge
name: Nogbou, Frédéric Ello
name: Calvo-Cortes, Maria-Camilla
name: Chazallon, Corine
name: Machault, Vanessa
name: Anglaret, Xavier
name: Bonnet, Fabrice
Publisher: name: The Francis Crick Institute
Year: 2022
Subjects: subject: Model organisms
subject: Infectious Disease
subject: Human Biology & Physiology
subject: Immunology
subject: FOS: Clinical medicine

description: BACKGROUND: Tuberculous meningitis (TBM) is the most lethal and disabling form of tuberculosis (TB), particularly in sub-Saharan Africa. Current anti-TB treatment is poorly effective since TBM mortality reaches 40% in HIV-negative patients and up to 70% in HIV-co-infected patients. To reduce TBM-induced morbidity and mortality, the INTENSE-TBM trial evaluates two interventions in both HIV-infected and uninfected patients: an anti-TB treatment intensification using oral high-dose rifampicin (35 mg/kg daily) and linezolid (1200 mg daily and then 600 mg daily) during the first 8 weeks of the anti-TB treatment and the use of adjunctive aspirin (200 mg daily). METHODS: This is a randomized controlled, phase III, multicenter, 2 × 2 factorial plan superiority trial. The trial has four arms, combining the two experimental treatments (intensified TBM regimen and aspirin) with the two reference treatments (WHO standard TB treatment and placebo), and is open-label for anti-TB treatment and double-blind placebo-controlled for aspirin treatment. This trial is conducted in adults or adolescents of age ≥15 years with TBM defined as "definite," "probable," or "possible" using Tuberculosis Meningitis International Research Consortium criteria, in four African countries: Ivory Coast, Madagascar, Uganda, and South Africa. The primary outcome is all-cause death between inclusion and week 40. DISCUSSION: The INTENSE-TBM trial represents a key opportunity to enhance TBM treatment with widely available existing drugs notably in high-incidence settings of both TB and HIV. The trial design is pragmatic and the results will permit early and effective applications in TBM patient care, in both HIV and TB high-incidence countries. TRIAL REGISTRATION: ClinicalTrials.gov NCT04145258. Registered on October 30, 2019.
Control of populations of two-level systems by a single resonant laser pulse
Creators: name: Golubev, Nikolay V.
name: Kuleff, Alexander I.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a simple approach allowing to obtain analytical expressions for laser pulses that can drive a two-level system in an arbitrarily chosen way. The proposed scheme relates every desired population-evolution path to a single resonant laser pulse. It allows to drive the system from any initial superposition of the two states to a final state having the desired distribution of the populations. We exemplify the scheme with a concrete example, where the system is driven from a non-stationary superposition of states to one of its eigenstates. We argue that the proposed approach may have interesting applications for designing pulses that can control ultrafast charge-migration processes in molecules. Although focused on laser driven population control, the results obtained are general and could be applied for designing other types of control fields.
Production of PBHs from inflaton structure
Creators: name: Hidalgo, Juan Carlos
name: Padilla, Luis E.
name: German, Gabriel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: At times prior to Big Bang Nucleosynthesis, the universe could show a primordial structure formation period if dominated by a fast oscillating inflaton field during reheating. In this context, we have postulated a new mechanism of primordial black hole formation [L. E. Padilla, J. C. Hidalgo, and K. A. Malik, Phys. Rev. D, vol. 106, p. 023519, Jul 2022], that draws the analogy between an extended reheating era and the scalar field dark matter model, stipulating the gravitational collapse of inflaton halos and inflaton stars. In this paper we look at the requirements for the realization of this new mechanism. We show that a generic primordial power spectrum with a peak at small scales is most suitable for the production of a considerable number of PBHs. When such requirement is met, and if reheating lasts long enough, large populations of PBHs with $M_{\rm PBH}\sim 1~\mathrm{gram}$ may be produced. We find in particular, that the mass fraction of PBHs is orders of magnitude larger than that obtained when PBHs form via direct collapse in a universe dominated by radiation or pressure-less dust. Looking at observable implications of our findings, we explore the possibility that the PBHs component may dominate the energy density of the universe at some point after the end of reheating.
description: 11 pages, 5 figures. Accepted for publication in PRD
Bireysel Bellek Bağlamında Erzurum Türkleri: Ağzehir Köyünden Mahalli İcracı Canip Aydın Örneği
Creators: name: AYDIN, Aytunç
Publisher: name: Zenodo
Year: 2023
Subjects: Bellek
Bireysel Bellek
Canip Aydın
Erzurum Türküleri
Ağzehir Köyü

description: Geniş bir inceleme alanı olarak bellek çalışmaları, farklı disiplinlerle ele alınarak 20. Yüzyıldan itibaren yoğunluk kazanmaya başlamıştır. Bireyler geçmişleriyle ilgili deneyimlerini, bilgilerini bellek yoluyla akılda tutarlar. Belleğin öznesi olan bireye odaklanan ve bireylerin yaşam öykülerine yönelen bireysel bellek, bellek çalışmalarından birini oluşturur. Bu çalışmanın amacı anlatı ekseninde Erzurum'lu mahalli icrâcı olan Canip Aydın'ın yaşam öyküsü hakkında bilgi sahibi olmak ve bireysel bellek çerçevesinde kişiyle yapılan görüşmelerden istifade ederek doğup büyüdüğü yer olan Erzurum'un Taşlıyurt Mahallesi'ndeki (Ağzehir Köyü'nde) söylenen türküleri tespit etmektir. Çalışmada veriler kaynak tarama ve görüşme teknikleriyle toplanmıştır. Kaynak kişiye sorulması planlanan sorular uzman görüşüne başvurularak oluşturulup düzenlenmiştir. Araştırma öncesi Ordu Üniversitesi Sosyal ve Beşeri Bilimler Araştırmaları Etik Kurulu Birimi'nden Etik Kurul onayı alınmıştır. Görüşme sağlanacak kişi olan Canip Aydın'a araştırmanın amacı açıklandıktan ve araştırma hakkında bilgilendirme yapıldıktan sonra kendisine gönüllü olur formu imzalatılmış ve veri toplama aşaması başlatılmıştır. Kaynak kişi Canip Aydın'ın yaşam öyküsüne ait görüşme verileri betimsel analiz kullanılarak yorumlanmıştır. Kendisinden derlenen türkülerin makamsal analizinde ise Ezgi Merkezli Yaklaşım (EM-Y) temel alınmıştır. Görüşmeler neticesinde 39 adet türkü derlenmiştir. Bu türkülerin neredeyse tamamının oyun eşlikli olduğu tespit edilmiştir. Derlenen türkülerde makam etkilerinin, üç, dört veya beş perdenin kullanımıyla meydana gelen ezgisel hareketlerden oluştuğu anlaşılmıştır. Canip Aydın'dan derlenen, "Bayburt'un İnce Yolunda" adlı türkünün dışında kalan eserlerin TRT Türk halk müziği repertuvarında kayıtlı olmadığı görülmüştür. Kaynak kişi Canip Aydın'ın uzun yıllar mensubu olduğu grubun kültürel eğlence pratiklerine katılması, dolayısıyla bol tekrar içeren, müzikle ilgili icrâ uygulamaları yapması kendisinin belleğini canlı tutmasında belirleyici başlıca unsur olduğu kanaatine varılmıştır. Çalışmanın mihrak noktasında yer alan Canip Aydın, asma davul icrâsındaki hakimiyeti ve aynı zamanda ses icrâcısı olması hasebiyle çok yönlü bir mahalli icrâcı olma özelliği taşımaktadır. Bununla beraber kendisi öğrendiği müzik pratiklerini bellek yoluyla taşıyarak bir kültür aktarıcısı olmuştur.
A Simple Analytical Model of Evaporation in the Presence of Roots
Creators: name: Cejas, Cesare M.
name: Hough, Larry
name: Castaing, Jean-Christophe
name: Fretigny, Christian
name: Dreyfus, Remi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Root systems can influence the dynamics of evapotranspiration of water out of a porous medium. The coupling of evapotranspiration remains a key aspect affecting overall root behavior. Predicting the evapotranspiration curve in the presence of roots helps keep track of the amount of water that remains in the porous medium. Using a controlled visual set-up of a 2D model soil system consisting of monodisperse glass beads, we first perform experiments on actual roots grown in partially saturated systems under different relative humidity conditions. We record parameters such as the total mass loss in the medium and the resulting position of the receding fronts and use these experimental results to develop a simple analytical model that predicts the position of the evaporating front as a function of time as well as the total amount of water that is lost from the medium due to the combined effects of evaporation and transpiration. The model is based on fundamental principles of evaporation flux and includes empirical assumptions on the quantity of stoma in the leaves and the transition time between regime 1 and regime 2. The model also underscores the importance of a much prolonged root life as long as the root is exposed to a partially saturated zone composed of a mixture of air and water. Comparison between the model and experimental results shows good prediction of the position of the evaporating front as well as the total mass loss from evapotranspiration in the presence of real root systems. These results provide additional understanding of both complex evaporation phenomenon and its influence on root mechanisms.
description: 10 pages, 6 figures
Arsenene: Two-dimensional buckled and puckered honeycomb arsenic systems
Creators: name: Kamal, C.
name: Ezawa, Motohiko
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Recently phosphorene, monolayer honeycomb structure of black phosphorus, was experimentally manufactured and attracts rapidly growing interests. Here we investigate stability and electronic properties of honeycomb structure of arsenic system based on first principle calculations. Two types of honeycomb structures, buckled and puckered, are found to be stable. We call them arsenene as in the case of phosphorene. We find that both the buckled and puckered arsenene possess indirect gaps. We show that the band gap of the puckered and buckled arsenene can be tuned by applying strain. The gap closing occurs at 6% strain for puckered arsenene, where the bond angles between the nearest neighbour become nearly equal. An indirect-to-direct gap transition occurs by applying strain. Especially, 1% strain is enough to transform the puckered arsenene into a direct-gap semiconductor. Our results will pave a way for applications to light-emitting diodes and solar cells.
description: 5 figures, 1 table
Get your phone out of the drawer: revealed and stated preferences
Creators: name: Blass, Vered
name: Tchetchik, Anat
name: Nichols, Austin
Publisher: name: Technische Universität Berlin
Year: 2021
Subjects: subject: 500 Naturwissenschaften und Mathematik
subject: 600 Technik, Technologie
subject: 300 Sozialwissenschaften
subject: mobile phone
subject: recycling
subject: experiment
subject: information

description: With short life cycles and fast changes in technology, more and more cellphones arrive at the end-of-use stage while retaining economic value, and many are suitable for reuse and recycling. But consumers make privately optimal decisions disregarding social externalities, and we study both the determinants of their choices via a discrete-choice experiment, and the effect of an experimentally assigned informational intervention on those choices. We present results from a comprehensive survey of 308 consumers conducted in Israel in 2014 using advanced discrete choice modeling with an efficient Bayesian design, and find that the informational intervention reduced decisional inertia for some consumers, lowered the propensity to trash an old phone, and decreased the intrinsic value of storing an obsolete phone.
A flexible multi-reference perturbation theory by minimizing the Hylleraas functional with matrix product states
Creators: name: Sharma, Sandeep
name: Chan, Garnet Kin-Lic
Publisher: name: arXiv
Year: 2014
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We describe a formulation of multi-reference perturbation theory that obtains a rigorous upper bound to the second order energy by minimizing the Hylleraas functional in the space of matrix product states (MPS). The first order wavefunctions so obtained can also be used to compute the third order energy with little overhead. Our formulation has several advantages including (i) flexibility with respect to the choice of zeroth order Hamiltonian, (ii) recovery of the exact uncontracted multi-reference perturbation theory energies in the limit of large MPS bond dimension, (iii) no requirement to compute high body density matrices, (iv) an embarrassingly parallel algorithm (scaling up to the number of virtual orbitals, squared, processors). Preliminary numerical examples show that the MPS bond dimension required for accurate first order wavefunctions scales sub-linearly with the size of the basis.
Holographic renormalization by Hamilton-Jacobi formulation with generated ansatz
Creators: name: Ma, Ming-Xia
name: Wu, Shao-Feng
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In AdS/CFT corresponding, the UV divergence of generating functional on the field theory can be removed as the IR divergence in the gravity. This geometric process is well known as holographic renormalization. The standard method of holographic renormalization is based on the Fefferman-Graham expansion, which is strict and universal but technically cumbersome. To improve the technique, different methods have been proposed. Here we develop an alternative approach to holographic renormalization based on the Hamilton-Jacobi formulation of gravity. Compared to previous approaches, its distinguishing feature is the generation of exact ansatz of counterterms. We apply this approach to several typical holographic models, which consistently performs well.
description: 28 pages
MPEC 2023-R35 : 2023 RP
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 RP

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.
The Cartan, Choquet and Kellogg properties for the fine topology on metric spaces
Creators: name: Björn, Anders
name: Björn, Jana
name: Latvala, Visa
Publisher: name: arXiv
Year: 2014
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 31E05 (Primary) 30L99, 31C40, 31C45, 35J92, 49Q20 (Secondary)

description: We prove the Cartan and Choquet properties for the fine topology on a complete metric space equipped with a doubling measure supporting a $p$-Poincaré inequality, $1 < p< \infty$. We apply these key tools to establish a fine version of the Kellogg property, characterize finely continuous functions by means of quasicontinuous functions, and show that capacitary measures associated with Cheeger supersolutions are supported by the fine boundary of the set.
description: arXiv admin note: text overlap with arXiv:1310.8101
L’Informal International Lawmaking in materia di riammissione: prassi e implicazioni sul rapporto tra diritto internazionale e diritto dell’Unione europea
Creators: name: Sardu, Alessandra
Publisher: name: Universita' degli Studi di Salerno
Year: 2021
Subjects: Informal International Lawmaking
Readmission agreements
Principle of autonomy of the EU legal order
Pact on Migration and Asylum

description: This article explores the articulated regulatory and political framework within which the European Union's choice to prefer the adoption of informal acts instead of traditional instruments of international law, in the external management of immigration has taken form. The existence in European Union practice of informal tools that can be more correctly qualified as informal agreements will be demonstrated taking into account their characteristics, content, and similarities with the EURAs concluded by the European Union with third countries. Reference will be made exclusively to the practice of the European Union, without analyzing the informal instruments adopted in the same field by the Member States. Finally, the study will look at the systemic implications of using informal instruments on the relationship between EU law and international law, also in the light of the principle of autonomy of the EU legal order developed by the CJEU
Topology of black hole thermodynamics in Lovelock gravity
Creators: name: Bai, Ning-Chen
name: Li, Lei
name: Tao, Jun
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this work, we present a convenient method to perform the topological analysis of black hole thermodynamics. Utilizing the spinodal curve, thermodynamic critical points of a black hole are endowed with a topological quantity, Brouwer degree, which reflects intrinsic properties of the system under smooth deformations. Specially, in our setup, it can be easily calculated without exact solution of critical points. This enables us to conveniently investigate the topological transition between different thermodynamic systems, and give a topological classification for them. In this framework, topology of Lovelock AdS black holes with spherical horizon geometry is explored. Results show that charged black holes in arbitrary dimensions can be classified into the same topology class, whereas the $d=7$ and $d \geq 8$ uncharged black holes are in different topology classes. Moreover, we revisit the relation between different phase structures of these black holes from the viewpoint of topology. Some general topological properties of critical points are also discussed.
description: 11 pages, 7 figures
Automatic detection of peculiar galaxy pairs in Sloan Digital Sky Survey
Creators: name: Shamir, Lior
name: Wallin, John
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We applied computational tools for automatic detection of peculiar galaxy pairs. We first detected in SDSS DR7 ~400,000 galaxy images with i magnitude <18 that had more than one point spread function, and then applied a machine learning algorithm that detected ~26,000 galaxy images that had morphology similar to the morphology of galaxy mergers. That dataset was mined using a novelty detection algorithm, producing a short list of 500 most peculiar galaxies as quantitatively determined by the algorithm. Manual examination of these galaxies showed that while most of the galaxy pairs in the list were not necessarily peculiar, numerous unusual galaxy pairs were detected. In this paper we describe the protocol and computational tools used for the detection of peculiar mergers, and provide examples of peculiar galaxy pairs that were detected.
description: MNRAS, accepted
title: АКТУАЛЬНЫЕ ВОПРОСЫ МОНИТОРИНГА БЕЗОПАСНОСТИ  ЛЕКАРСТВЕННЫХ ПРЕПАРАТОВ, НАХОДЯЩИХСЯ В ОБРАЩЕНИИ  НА ТЕРРИТОРИИ АСТРАХАНСКОЙ ОБЛАСТИ
Creators: name: Умерова, Аделя Равильевна
name: Дементьева, Виктория Валерьевна
name: Сидоркина, Татьяна Владимировна
Publisher: name: Астраханский государственный медицинский университет
Year: 2022
Subjects: subject: Clinical medicine
subject: FOS: Clinical medicine

description: Аннотация. Отражены актуальные вопросы мониторинга безопасности лекарственных препаратов, находящихся в обращении на территории Астраханской области. Проведен анализ зарегистрированных нежелательных реакций на лекарственные препараты, в том числе на вакцины для профилактики новой коронавирусной инфекции COVID-19.
Analytical Weak-lensing Shear Responses of Galaxy Properties and Galaxy Detection
Creators: name: Li, Xiangchong
name: Mandelbaum, Rachel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Shear estimation bias from galaxy detection and blending identification is now recognized as an issue for ongoing and future weak lensing surveys. Currently, the empirical approach to correcting for this bias involves numerically shearing every observed galaxy and rerunning the detection and selection process. In this work, we provide an analytical correction for this bias that is accurate to subpercent level and far simpler to use. With the interpretation that smoothed image pixel values and galaxy properties are projections of the image signal onto a set of basis functions, we analytically derive the linear shear responses of both the pixel values and the galaxy properties (i.e., magnitude, size and shape) using the shear responses of the basis functions. With these derived shear responses, we correct for biases from shear-dependent galaxy detection and galaxy sample selection. With the analytical covariance matrix of measurement errors caused by image noise on pixel values and galaxy properties, we correct for the noise biases in galaxy shape measurement and the detection/selection process to the second-order in noise. The code used for this paper can carry out the detection, selection, and shear measurement for ~1000 galaxies per CPU second. The algorithm is tested with realistic image simulations, and we find, after the analytical correction (without relying on external image calibration) for the detection/selection bias of about $-4\%$, the multiplicative shear bias is $-0.12 \pm 0.10\%$ for isolated galaxies; and $-0.3 \pm 0.1\%$ for blended galaxies with Hyper Suprime-Cam observational condition.
description: 23 pages, 22 figures, Accepted in MNRAS
Organometallic Complexes of Graphene and Carbon Nanotubes: Introducing New Perspectives in Atomtronics, Spintronics, High Mobility Graphene Electronics and Energy Conversion Catalysis
Creators: name: Sarkar, Santanu
name: Haddon, Robert Cort
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Here we present an overview of recent fundamental studies on the nature of the interaction between individual metal atoms and metal clusters and the conjugated surfaces of graphene and carbon nanotube with a particular focus on the electronic structure and chemical bonding at the metal-graphene interface. We discuss the relevance of organometallic complexes of graphitic materials to the development of a fundamental understanding of these interactions and their application in atomtronics as atomic interconnects, high mobility organometallic transistor devices, high-frequency electronic devices, organometallic catalysis (hydrogen fuel generation by photocatalytic water splitting, fuel cells, hydrogenation), spintronics, memory devices and in the next generation energy devices. We touch on CVD graphene grown on metals, the reactivity of its surface, and its use as a template for asymmetric graphene functionalization chemistry (ultrathin Janus discs). We highlight some of the latest advances in understanding the nature of interactions between metals and graphene surfaces from the standpoint of metal overlayers deposited on graphene and SWNT thin films. Finally, we comment on the major challenges facing the field and the opportunities for technological applications.
description: Please the article cite as Sarkar, S. et al. Chem. Mater., 2014, 26, pp 184 to 195
Supernova Remnants Interacting with Molecular Clouds: X-ray and Gamma-ray Signatures
Creators: name: Slane, P.
name: Bykov, A.
name: Ellison, D. C.
name: Dubner, G.
name: Castro, D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The giant molecular clouds (MCs) found in the Milky Way and similar galaxies play a crucial role in the evolution of these systems. The supernova explosions that mark the death of massive stars in these regions often lead to interactions between the supernova remnants (SNRs) and the clouds. These interactions have a profound effect on our understanding of SNRs. Shocks in SNRs should be capable of accelerating particles to cosmic ray (CR) energies with efficiencies high enough to power Galactic CRs. X-ray and gamma-ray studies have established the presence of relativistic electrons and protons is some SNRs and provided strong evidence for diffusive shock acceleration as the primary acceleration mechanism, including strongly amplified magnetic fields, temperature and ionization effects on the shock-heated plasmas, and modifications to the dynamical evolution of some systems. Because protons dominate the overall energetics of the CRs, it is crucial to understand this hadronic component even though electrons are much more efficient radiators and it can be difficult to identify the hadronic component. However, near MCs the densities are sufficiently high to allow the gamma-ray emission to be dominated by protons. Thus, these interaction sites provide some of our best opportunities to constrain the overall energetics of these particle accelerators. Here we summarize some key properties of interactions between SNRs and MCs, with an emphasis on recent X-ray and gamma-ray studies that are providing important constraints on our understanding of cosmic rays in our Galaxy.
description: 28 Pages, 9 Figures. Accepted for publication in Space Science Reviews
Frequency-dependent hydrodynamic finite size correction in molecular simulations reveals the long-time hydrodynamic tail
Creators: name: Scalfi, Laura
name: Vitali, Domenico
name: Kiefer, Henrik
name: Netz, Roland R.
Publisher: name: Freie Universität Berlin
Year: 2023
Subjects: subject: Molecular simulations
subject: Molecular dynamics
subject: Hydro-thermodynamics
subject: 500 Naturwissenschaften und Mathematik::530 Physik::530 Physik

description: Finite-size effects are challenging in molecular dynamics simulations because they have significant effects on computed static and dynamic properties, in particular diffusion constants, friction coefficients, and time- or frequency-dependent response functions. We investigate the influence of periodic boundary conditions on the velocity autocorrelation function and the frequency-dependent friction of a particle in a fluid, and show that the long-time behavior (starting at the picosecond timescale) is significantly affected. We develop an analytical correction allowing us to subtract the periodic boundary condition effects. By this, we unmask the power-law long-time tails of the memory kernel and the velocity autocorrelation function in liquid water and a Lennard-Jones fluid from simulations with rather small box sizes.
The Carpentries Incubator and Lab: a pathway to peer-reviewed publication for open source lessons
Creators: name: Hodges, Toby
name: Kamvar, Zhian
name: Culshaw-Maurer, Michael
name: Michonneau, François
Publisher: name: Zenodo
Year: 2022

description: The Carpentries teaches software and data skills to researchers and librarians all over the world. Our Instructor Training program promotes good teaching practices, grounded in research findings in educational psychology. Certified Instructors teach lessons developed and maintained by the community in short-format workshops. These lessons are developed in open source repositories and published online with a permissive CC-BY license. The Carpentries Incubator was created to provide a space for the community to collaborate on the development and testing of new lessons. The Incubator contains more than 100 lesson repositories, at various different stages of the lesson life cycle, teaching a wide range of skills relevant to RSEs, including workflow management, statistics and deep learning, and MRI data analysis. Community members collaborate to create new lessons, and teach and provide feedback on those that have reached later stages of maturity. The Carpentries Lab provides a space for the community to perform open peer review of these lessons, curating a collection of accessible, high-quality community-developed lessons that Instructors can be confident are ready to adopt and teach to their audience. In collaboration with The Journal of Open Source Education (JOSE), the Lab provides a mechanism for peer review to result in journal publication credit for lesson developers. This poster outlines the pathways a lesson can take through The Carpentries Incubator and Lab, the support provided for lesson development in The Carpentries, and details of the open peer review and publication process.
description: The Carpentries is grateful to the Alfred P Sloan Foundation, the Chan Zuckerberg Initiative, and the Gordon and Betty Moore Foundation for funding work presented in this poster.
MPEC 2023-R36 : 2023 QB10
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 QB10

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.
The Infrared Medium-Deep Survey II: How to Trigger Radio-AGN? Hints from Their Environments
Creators: name: Karouzos, Marios
name: Im, Myungshin
name: Kim, Jae-Woo
name: Lee, Seong-Kook
name: Chapman, Scott
name: Jeon, Yiseul
name: Choi, Changsu
name: Hong, Jueun
name: Hyun, Minhee
name: Jun, Hyunsung David
name: Kim, Dohyeong
name: Kim, Yongjung
name: Kim, Ji Hoon
name: Kim, Duho
name: Pak, Soojong
name: Park, Won-Kee
name: Taak, Yoon Chan
name: Yoon, Yongmin
name: Edge, Alastair
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Activity at the centers of galaxies, during which the central supermassive black hole is accreting material, is nowadays accepted to be rather ubiquitous and most probably a phase of every galaxy's evolution. It has been suggested that galactic mergers and interactions may be the culprits behind the triggering of nuclear activity. We use near-infrared data from the new Infrared Medium-Deep Survey (IMS) and the Deep eXtragalactic Survey (DXS) of the VIMOS-SA22 field and radio data at 1.4 GHz from the FIRST survey and a deep VLA survey to study the environments of radio-AGN over an area of ~25 sq. degrees and down to a radio flux limit of 0.1 mJy and a J-band magnitude of 23 mag AB. Radio-AGN are predominantly found in environments similar to those of control galaxies at similar redshift, J-band magnitude, and U-R rest-frame absolute color. However, a sub-population of radio-AGN is found in environments up to 100 times denser than their control sources. We thus preclude merging as the dominant triggering mechanism of radio-AGN. Through the fitting of the broadband spectral energy distribution of radio-AGN in the least and most dense environments, we find that those in the least dense environments show higher radio-loudness, higher star formation efficiencies, and higher accretion rates, typical of the so-called high-excitation radio-AGN. These differences tend to disappear at z>1. We interpret our results in terms of a different triggering mechanism for these sources that is driven by mass-loss through winds of young stars created during the observed ongoing star formation.
description: 22 pages, 19 figures, accepted for publication in the ApJ
Rydberg ions in coherent motional states: A new method for determining the polarizability of Rydberg ions
Creators: name: Niederländer, Marie
name: Vogel, Jonas
name: Schulze-Makuch, Alexander
name: Gély, Bastien
name: Mokhberi, Arezoo
name: Schmidt-Kaler, Ferdinand
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We present a method for measuring the polarizability of Rydberg ions confined in the harmonic potential of a Paul trap. For a highly excited electronic state, the coupling between the electronic wave function and the trapping field modifies the excitation probability depending on the motional state of the ion. This interaction strongly depends on the polarizability of the excited state and manifests itself in the state-dependent secular frequencies of the ion. We initialize a single trapped $^{40}$Ca$^+$ ion from the motional ground state into coherent states with $|α|$ up to 12 using electric voltages on the trap segments. The internal state, firstly initialised in the long-lived 3D$_{5/2}$ state, is excited to a Rydberg S$_{1/2}$-state via the 5P$_{3/2}$ state in a two-photon process. We probe the depletion of the 3D$_{5/2}$ state owing to the Rydberg excitation followed by a decay into the internal ground 4S$_{1/2}$ state. By analysing the obtained spectra we extract the polarizability of Rydberg states which agree with numerical calculations. The method is easy-to-implement and applicable to different Rydberg states regardless of their principal or angular quantum numbers. An accurate value of the state polarizability is needed for quantum gate operations with Rydberg ion crystals.
description: 16 pages, 8 figures
Point and Interval Estimation on the Degree and the Angle of Polarization. A Bayesian approach
Creators: name: Maier, Daniel
name: Tenzer, Chris
name: Santangelo, Andrea
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Linear polarization measurements provide access to two quantities, the degree (DOP) and the angle of polarization (AOP). The aim of this work is to give a complete and concise overview of how to analyze polarimetric measurements. We review interval estimations for the DOP with a frequentist and a Bayesian approach. Point estimations for the DOP and interval estimations for the AOP are further investigated with a Bayesian approach to match observational needs. Point and interval estimations are calculated numerically for frequentist and Bayesian statistics. Monte Carlo simulations are performed to clarify the meaning of the calculations. Under observational conditions, the true DOP and AOP are unknown, so that classical statistical considerations - based on true values - are not directly usable. In contrast, Bayesian statistics handles unknown true values very well and produces point and interval estimations for DOP and AOP, directly. Using a Bayesian approach, we show how to choose DOP point estimations based on the measured signal-to-noise ratio. Interval estimations for the DOP show great differences in the limit of low signal-to-noise ratios between the classical and Bayesian approach. AOP interval estimations that are based on observational data are presented for the first time. All results are directly usable via plots and parametric fits.
description: 11 pages, 14 figures, 3 tables