cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Effetti collettivi a bunch singolo nelle strutture AF6 e AF8
Creators: name: Gianfelice, E.
name: Palumbo, L.
Publisher: name: INFN Open Access Repository
Year: 1986
Subjects: ADONE
Afrodite
Microwawe instabilities
Intrabeam scattering
Touschek lifetime
G-83

description: Conclusioni: Come emerso recentemente, la comunità dei fisici sperimentali interessati alle sorgenti di luce di Sincrotrone richiede tra le caratteristiche del fascio una lunghezza del bunch dell'ordine delle decine di picosecondi. Da questo punto di vista sembrerebbe utile avere cassi valor di 𝛂c allo scopo di rendere piccola la lunghezza naturale del bunch. D'altra parte non appena le corrente der bunch supera la soglia relativa alle instabilità a microonde longitudinali, le lunghezza del bunch risulta indipendente da 𝛂c; nel nostro caso tale regime è raggiunto con correnti minori di 1 milliampen per bunch. Valori di 𝛂c piccoli sono comunque preferibili perché favoriscono correnti di soglia più elevate nelle instabilità longitudinali a multibunch ed una maggior accettanza di RF. Solo la presenza di un FEL in regime di guadagno esponenziale [6] richiederebbe valori elevati di 𝛂c per ottenere il guadagno richiesto ad una determinata corrente di picco. In condizioni di allungamento anomalo la lunghezza del bunch può essere ridotta solo agendo sui parametri RF: [...]. È necessario però scegliere una coppia opportuna di valori tale de mantenere l'accettanza di RF al di sopra del valore necessario ad una vita media per effetto Touschek accettabile. Quest'ultimo sembra essere l'aspetto più preoccupante negli effetti a bunch singolo e pone condizioni severe sia sull'accettanza di RF, sia sull'apertura fisica che sull'apertura dinamica. Da questo punto di vista le due ottiche AF6 e AF8 sono equivalenti ed i diversi palori di (...) calcolati sono dovuti esclusivamente ai diversi valori di emittanta. Infine l'IBS mon he effetti rilevanti nell'emittanza ad energie > 1 GeV.
An Altarelli Cocktail for the MiniBooNE Anomaly?
Creators: name: Brdar, Vedran
name: Kopp, Joachim
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We critically examine a number of theoretical uncertainties affecting the MiniBooNE short-baseline neutrino oscillation experiment in an attempt to better understand the observed excess of electron-like events. We re-examine the impact of fake charged current quasi-elastic (CCQE) events, the background due to neutral current $π^0$ production, and the single-photon background. For all processes, we compare the predictions of different event generators (GENIE, GiBUU, NUANCE, and NuWro) and, for GENIE, of different tunes. Where MiniBooNE uses data-driven background predictions, we discuss the uncertainties affecting the relation between the signal sample and the control sample. In the case of the single-photon background, we emphasize the uncertainties in the radiative branching ratios of heavy hadronic resonances. We find that not even a combination of uncertainties in different channels adding up unfavorably (an "Altarelli cocktail") appears to be sufficient to resolve the MiniBooNE anomaly. We finally investigate how modified background predictions affect the fit of a $3+1$ sterile neutrino scenario. We carefully account for full four-flavor oscillations not only in the signal, but also in the background and control samples. We emphasize that because of the strong correlation between MiniBooNE's $ν_e$ and $ν_μ$ samples, a sterile neutrino mixing only with $ν_μ$ is sufficient to explain the anomaly, even though the well-known tension with external constraints on $ν_μ$ disappearance persists.
description: 26 pages, 11 figures, 2 tables, analysis codes available at https://github.com/koppj/MiniBooNE
Інформаційно-аналітична комп'ютерна система підтримки прийняття рішень щодо попередження надзвичайних ситуацій на територіях розміщення хімічно небезпечних техногенних об'єктів
Creators: name: О., Попов О.
name: В., Яцишин А.
name: О., Ковач В.
name: Краснов Є. Б.
Publisher: name: Zenodo
Year: 2017

description: Розроблено сучасну інформаційно-аналітичну комп’ютерну систему, яка є потужним

інструментом підтримки прийняття рішень щодо попередження природних та техногенних надзвичайних

ситуацій (НС), пов’язаних із хімічним забрудненням атмосфери та поверхневих водних об’єктів (ПВО) на

територіях розміщення критично важливих об’єктів (ТЕЦ, ТЕС, АЕС, заводи, фабрики та інші небезпечні

підприємства та виробництва, що є забруднювачами атмосфери та водного середовища).
Bodotriidae
Creators: name: Mühlenhardt-Siegel, Ute
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Cumacea
Bodotriidae

description: Bodotriidae
Only two species of the family Bodotriidae were captured during the expeditions DIVA II, ZAIANGO, and BIOZAIRE 1 to 3. Both species, Bathycuma squamosa Mühlenhardt-Siegel, 2005 and Cyclaspoides longimerus Mühlenhardt- Siegel, 2005 were already known from the Angola Basin.
description: Published as part of Mühlenhardt-Siegel, Ute, 2014, Deep-sea Bodotriidae, Diastylidae and Pseudocumatidae (Cumacea, Crustacea) from the southeastern Atlantic, pp. 301-341 in Zootaxa 3815 (3) on page 303, DOI: 10.11646/zootaxa.3815.3.1, http://zenodo.org/record/227328
Quadrupolo compatto per Afrodite
Creators: name: Tazzari, S.
Publisher: name: INFN Open Access Repository
Year: 1986
Subjects: ADONE
Afrodite
Quadrupolo
G-82

description: La struttura G-67 per Afrodite prevede quadrupoli di lunghezza magnetica 400 mm e con gradiente massimo G=18 T/M. Il raggio di gola minimo per motivi di apertura di macchina ed esigenze di vuoto deve essere 30 mm. I dati di dimensionamento del circuito magnetico sono quelli riportati in Tabella 1.
Governing Without A Fundamental Direction of Time: Minimal Primitivism about Laws of Nature
Creators: name: Chen, Eddy Keming
name: Goldstein, Sheldon
Publisher: name: arXiv
Year: 2021
Subjects: subject: History and Philosophy of Physics (physics.hist-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Great Divide in metaphysical debates about laws of nature is between Humeans, who think that laws merely describe the distribution of matter, and non-Humeans, who think that laws govern it. The metaphysics can place demands on the proper formulations of physical theories. It is sometimes assumed that the governing view requires a fundamental / intrinsic direction of time: to govern, laws must be dynamical, producing later states of the world from earlier ones, in accord with the fundamental direction of time in the universe. In this paper, we propose a minimal primitivism about laws of nature (MinP) according to which there is no such requirement. On our view, laws govern by constraining the physical possibilities. Our view captures the essence of the governing view without taking on extraneous commitments about the direction of time or dynamic production. Moreover, as a version of primitivism, our view requires no reduction / analysis of laws in terms of universals, powers, or dispositions. Our view accommodates several potential candidates for fundamental laws, including the principle of least action, the Past Hypothesis, the Einstein equation of general relativity, and even controversial examples found in the Wheeler-Feynman theory of electrodynamics and retrocausal theories of quantum mechanics. By understanding governing as constraining, non-Humeans who accept MinP have the same freedom to contemplate a wide variety of candidate fundamental laws as Humeans do.
description: Forthcoming in Yemima Ben-Menahem (ed.), Rethinking Laws of Nature, Springer. The main change from v1 is the addition of "A Sharper Contrast" on p.36
File 13
Publisher: name: Columbia University
Year: 2019

description: November 2, 1974: Bob takes calls while watching a video in the studio. One woman reads a poem about beans and requests people who attended the Women's Fair to call in. Bob suspects a caller is a man named Artie and threatens to expose him as a rapist if he doesn't get off the line. Bob talks about his time in the army at Fort Bragg. Offensive caller from Queens causes several people to hang up
[Die  Eiserne Thurbrücke, Ansicht von Osten gegen Andelfingen]
Creators: name: Eggli, Jakob
Publisher: name: [s.n.]
Year: 1857
Subjects: Dampflokomotive
Andelfingen

description: Die Zeichnung zeigt die 1856/7 erbaute, 1906 erneuerte eiserne Thurbrücke der am 15. April 1857 eröffneten Linie der Nordostbahn von Winterthur nach Schaffhausen. Ansicht von Osten (Standort unterhalb Holzackerbuck) mit Blick flussabwärts gegen Andelfingen
description: [Jakob Eggli]
Bohm approach to the Gouy phase shift
Creators: name: Moya-Cessa, Héctor M.
name: Hojman, Sergio A.
name: Asenjo, Felipe A.
name: Soto-Eguibar, Francisco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: By adapting the Madelung-Bohm formalism to paraxial wave propagation we show, by using Ermakov-Lewis techniques, that the Gouy phase is related to the form of the phase chosen in order to produce a Gaussian function as a propagated field. For this, we introduce a quantum mechanical invariant, that it is explicitly time dependent despite the fact that the Hamiltonian is itself time-independent. We finally show that the effective Bohm {\it index of refraction} generates a GRIN medium that produces the focusing needed for the Gouy phase.
Booster AFINO2 per Afrodite (FODO con 24 magneti, raggio magnetico = 5 m)
Creators: name: Patteri, P.
Publisher: name: INFN Open Access Repository
Year: 1986
Subjects: ADONE
Afrodite
Booster
G-81

description: Per ridurre la lunghezza del booster per AFRODITE da ∼ 95 m (memo G-73) a ∼ 75 m si e' assunto che sia accettabile un'emittanza a 1500 MeV di 1x10⁻⁷, così da poter ridurre il numero dei magneti richiesti.
Differenze tra MAD, PATRICIA e JUMBO nel calcolo del cromatismo
Creators: name: Preger, M.
Publisher: name: INFN Open Access Repository
Year: 1986
Subjects: ADONE
Afrodite
Cromatismo
G-80

description: Dalla Fig. 7 del Memorandum G-72 (1) è apparso che l'andamento (calcolato con PATRICIA) della frequenza di betatrone orizzontale con lo scostamento in energia degli elettroni non ha derivata nulla nell'origine, come ci si aspetta quando si impone l'annullamento del croma tismo in una struttura magnetica. Questo effetto non compare per la frequenza di betatrone verticale. Dal momento che questo andamento non è mai stato stato osservato nelle strutture calcolate per Afrodite e per ESRP (nei limiti della risoluzione del calcolo con PATRICIA), mentre è apparso per la prima volta per il booster di Afrodite, è probabile che l'errore viene posto in rilievo quando il focheggiamento del magnete curvante, trascurabile per le ottiche a bassa emittanza, diventa apprezzabile rispetto a quello dei quadrupoli, come avviene ad esempio in strutture FODO a basso avanzamento di fase per cella. Per stimare l'entità dell'effetto, sono stati calcolati i cromatismi con i tre programmi PATRICIA, MAD e JUMBO per una tipica struttura di iniettore a celle FODO senza inserzioni.
[Nach] d. Natur ausgeführt
Creators: name: Rahn, Johann Rudolf
Publisher: name: [s.n.]
Year: 1861
Subjects: Königsfelden

description: Darstellung zeigt eine Aussenansicht des ehemaligen Klarissenklosters Königsfelden in Windisch (West- und Nordflügel)
description: [Johann Rudolf Rahn]
Sestupolo compatto per Afrodite
Creators: name: Cattoni, A.
name: Faini, S.
name: Modestino, G.
name: Sanelli, C.
Publisher: name: INFN Open Access Repository
Year: 1986
Subjects: ADONE
Afrodite
Sestupolo
G-79

description: La struttura G-67 per Afrodite prevede sestupoli di lunghezza magnetica 200 mm e con costante sestupolare S-442.5 T/M2. Il raggio di gola minimo per motivi di apertura di macchina ed esigenze di vuoto deve essere 30 mm. Il basso rapporto cerchio di gota/lunghezza magnetica consiglia lo studio del sestupolo anche con l'ausilio di un codice tridimensionale. I dati di dimensionamento del circuito magnetico sono quelli riportati in Tabella 1.
Electromagnetically induced transparency and absorption cross-over with a four-level Rydberg system
Creators: name: Oyun, Yağız
name: Çakır, Özgür
name: Sevinçli, Sevilay
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Electromagnetically induced transparency (EIT) and absorption (EIA) are quantum coherence phenomena which result due to interference of excitation pathways. Since the first realization of EIT in 1991 and EIA in 1998, mechanisms behind these remarkable effects have been studied extensively, therefore both are relatively easily achievable in controlled environments. Combining EIT and EIA with Rydberg atoms have provided utility in various research fields such as interacting many body systems, quantum optics and quantum information science. We propose an analysis of Rydberg-EIT and Rydberg-EIA effects in cold Cs and Rb atomic ensembles in a four-level ladder type scheme with self-consistent mean field approach. Our results are consistent with experimental realizations and provide a many-body method to simulate EIT-EIA cross-over.
description: 16 pages, 8 figures
Calcolo delle aperture per AF10b
Creators: name: Preger, M.
Publisher: name: INFN Open Access Repository
Year: 1986
Subjects: ADONE
Afrodite
AF10b
G-78

description: Indice: 1) Fascio accumulato; 2) Iniezione; 3) Effetto Touschek; 4) Scattering sul gas residuo; 5) Riepilogo; Referenze.
Topological study of a Bogoliubov-de Gennes system of pseudo spin-$1/2$ bosons with conserved magnetization in a honeycomb lattice
Creators: name: Ling, Hong Y.
name: Kain, Ben
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider a Bogolibov-de Geenes (BdG) Hamiltonian, which is a non-Hermitian Hamiltonian with pseudo-Hermiticity, for a system of (pseudo) spin-$1/2$ bosons in a honeycomb lattice under the condition that the population difference between the two spin components, i.e., magnetization, is a constant. Such a system is capable of acting as a topological amplifier, under time-reversal symmetry, with stable bulk bands but unstable edge modes which can be populated at an exponentially fast rate. We quantitatively study the topological properties of this model within the framework of the 38-fold way for non-Hermitian systems. We find, through the symmetry analysis of the Bloch Hamiltonian, that this model is classified either as two copies of symmetry class AIII+$η_-$ or two copies of symmetry class A+$η$ depending on whether the (total) system is time-reversal-symmetric, where $η$ is the matrix representing pseudo-Hermiticity and $η_-$ indicates that pseudo-Hermiticity and chiral symmetry operators anticommute. We prove, within the context of non-Hermitian physics where eigenstates obey the bi-orthonormality relation, that a stable bulk is characterized by a single topological invariant, the Chern number for the Haldane model, independent of pairing interactions. We construct a convenient analytical description for the edge modes of the Haldane model in semi-infinite planes, which is expected to be useful for models built upon copies of the Haldane model across a broad array of disciplines. We adapt the theorem in our recent work [Phys. Rev. A 104, 013305 (2021)] to pseudo-Hermitian Hamiltonians that are less restrictive than BdG Hamiltonians and apply it to highlight that the vanishing of an unconventional commutator between number-conserving and number-nonconserving parts of the Hamiltonian indicates whether a system can be made to act as a topological amplifier.
description: 20 pages, 7 figures
On positive hypergraphs
Creators: name: Sidorenko, Alexander
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C22, 05C65

description: Camarena, Csóka, Hubai, Lippner, and Lovász introduced the notion of positive graphs. This notion naturally extends to $r$-uniform hypergraphs. In the case when $r$ is odd, we prove that a hypergraph is positive if and only if its Levi graph is positive. As an application, we show that the $1$-subdivision of $K_{r,r}$ is not a positive graph when $r$ is odd.
description: final version accepted by European Journal of Combinatorics
Königsfelden[.] Holz-Schnitzereien - Kloster Königsfelden
Creators: name: Rahn, Johann Rudolf
Publisher: name: [s.n.]
Year: 1861
Subjects: Königsfelden

description: [Johann Rudolf Rahn]
description: Handschriftliche Notizen von Johann Rudolf Rahn "[...] abgebrochene Latten im Schiff der Kirche" und zum Massstab "1/5 natürl. Grösse"
Diastylidae
Creators: name: Mühlenhardt-Siegel, Ute
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Cumacea
Diastylidae

description: Diastylidae
In total, 11 morphotypes are present in the collections examined: eight morphotypes in the DIVA II collection and three in the Ifremer collection. Eight species were represented only by single specimens. The species Makrokylindrus (Adiastylis) renatae, M. (M.) meteorae, M. (A.) duplosetosus, M. (A.) paramonodi and M. (A.) totzkei were all described from the Angola Basin by Mühlenhardt-Siegel (2005e), Leptostylis macrura Sars, 1869 and Diastylis algoae Zimmer, 1908 were described much earlier.
description: Published as part of Mühlenhardt-Siegel, Ute, 2014, Deep-sea Bodotriidae, Diastylidae and Pseudocumatidae (Cumacea, Crustacea) from the southeastern Atlantic, pp. 301-341 in Zootaxa 3815 (3) on page 313, DOI: 10.11646/zootaxa.3815.3.1, http://zenodo.org/record/227328
Struttura AF11b per Afrodite
Creators: name: Biscari, C.
name: Palumbo, L.
Publisher: name: INFN Open Access Repository
Year: 1986
Subjects: ADONE
Afrodite
AF11b
G-77

description: Presentiamo un'ottica caratterizzata da bassi valori di 𝛽 radiale nelle inserzioni. La configurazione base é quella descritta in G-76 con un ulteriore quadrupolo D nella sezione dritta; ne risulta una lunghezza totale di circa 268 m. I parametri degli elementi costituenti la sezione dispersiva sono stati leggermente modificati allo scopo di separare le funzioni 𝛽 al centro della sezione. I parametri della macchina sono riportati in Tabella 1, le funzioni ottiche con le caratteristiche degli elementi lineari sono elencate in Tabella-H, te proprietà delle sorgenti sono descritte in Tabella III. Anche in questo caso sono state usate solo due famiglie di sestupoli nella sezione dispersiva per correggere il cromatismo ed una famiglia di sestupoli nella sezione non dispersiva per la correzione del Q-shift on amplitude (vedi fig.1); i gradienti dei sestupoli sono riportati in Tabella IV. La dipendenza dall'energia delle funzioni ottiche e della parte frazionaria dei numeri di betatrone é mostrata nelle Fig.3, 4 e 5, mentre in Fig. 6 é riportato l'andamento di Qx in funzione dell'ampiezza di betatrone radiale. L'apertura dinamica per particelle ad energia nominale e con deviazioni di energia dell'1.5% e del 3% e mostrata in Fig.7. Il comportamento non lineare di questa struttura é migliore di quello ottenuto per AF1la, come si può notare sia dall'andamento dei beta, sia dalle aperture dinamiche. La struttura EEF con i sette quadrupoli nella sezione dispersiva presenta risultati soddisfacenti sia con valori bassi che con valori alti di beta radiali nelle sezioni dritte. Lo studio successivo su questo tipo di ottica sarà rivolto alla possibilità di variare i valori di ß in alcune delle sezioni dritte cambiando i gradienti del tripletto dell'inserzione e lasciando invariata la sezione dispersiva.
Intersection Bodies of Polytopes
Creators: name: Berlow, Katalin
name: Brandenburg, Marie-Charlotte
name: Meroni, Chiara
name: Shankar, Isabelle
Publisher: name: arXiv
Year: 2021
Subjects: subject: Algebraic Geometry (math.AG)
subject: Combinatorics (math.CO)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 52A30, 14P10, 52A38, 52B11

description: We investigate the intersection body of a convex polytope using tools from combinatorics and real algebraic geometry. In particular, we show that the intersection body of a polytope is always a semialgebraic set and provide an algorithm for its computation. Moreover, we compute the irreducible components of the algebraic boundary and provide an upper bound for the degree of these components.
description: As published in Beitr\"age zur Algebra und Geometrie. Correction of a scaling factor from previous version
Königsfelden
Creators: name: Rahn, Johann Rudolf
Publisher: name: [s.n.]
Year: 1861
Subjects: Königsfelden

description: [Johann Rudolf Rahn]
description: Handschriftliche Notizen von Johann Rudolf Rahn "abgebrochene Latten im Schiff der Kirche. Altar an seinem [...] Auf blauen u. [...]" und zum Massstab " 25' lang. 1/5 natürl. Grösse"
Struttura AF11a (Expanded empty FODO) per Afrodite
Creators: name: Biscari, C.
name: Palumbo, L.
Publisher: name: INFN Open Access Repository
Year: 1986
Subjects: ADONE
Afrodite
AF11a
Expanded Empty FODO
G-76

description: Abbiamo chiamato Expanded Empty FODO una struttura derivata dall'AF8 (1), aggiugendo due quadrupoli nella sezione dispersiva, allo scopo di migliorarne if comportamento non lineare.(3) La sezione dispersiva della struttura è stata ottenuta partendo da due celle FODO e da due quadrupoli che agiscono da dispersion suppressor. L'avanzamento di fase nella singola cella é di circa 60°; ciò dovrebbe consentire, in linea di principio, di minimizzare l'ampiezza delle risonanze di 3° ordine dovute all'inserimento dei sestupoli. Ovviamente le celle FODO risultano "mismatched" quando si vuole soddisfare la condizione di ß radiale minimo all'interno del magnete per ottenere valori della emittanza prossimi al minimo teorico (2). Nella sezione dritta, lunga 6m, B é mantenuto a circa 20 m da un doppietto FD. La lunghezza totale della macchina con 12 sezioni dritte é 250 m. Nella TABELLA I sono riportati i parametri principali della macchina, mentre le funzioni ottiche e le caratteristiche degli elementi lineari sono elencati in TABELLA II. Le proprietà del fascio al centro della sezione dritta e all'uscita dei magneti sono descritte in TABELLA III. I numeri di betatrone radiale e verticale sono vicini ai valori della struttura AF8, mentre il cromatismo naturale è minore, soprattutto nel piano verticale. Ciò é dovuto, nonostante la maggiore lunghezza della macchina ed il maggior numero di quadrupoli, ai valori sensibilmente più bassi dei gradienti dei quadrupoli. Un vantaggio notevole di questa struttura è che la dispersione é maggiore di 20 cm in un'ampia zona, corrispondente alle due celle FODO, dove sono state inserite le due famiglie di sestupoli SF e SD per la correzione del cromatismo. Il fattore che lega e a x' é K=-4600. Una famiglia di sestupoli SF1, posti nella sezione non dispersiva, lo porta a_K=-1600, e ne risulta un andamento del Q, in funzione dell'ampiezza di betatrone regolare fino a circa 120 6 (vedi-Fig.6). Posizioni e gradienti dei sestupoli sono riportati in Fig.1 e TABELLA IV. La dipendenza dall'energia delle funzioni ottiche e della parte frazionaria di Q eQ é descritta nelle figure 3,4 e 5. Facciamo notare che i risultati ottenuti possano essere ulteriormente migliorati ottimizzando la correzione sestupolare, va riandone la posizione e/o aumentandone le famiglie. L'apertura dinamica é stata calcolata con l'ausilio del programma PATRICIA per particelle all'energia nominale e con scostamenti di energia dell'1.5% e del 3% (vedi fig. 7). L'apertura dinamica risulta notevolmente migliorata se confrontata con quella relativa all struttura AF8 e risulta soddisfacente anche a valori di devia zione di energia del 3%.
General comments on the ALS lattices
Creators: name: Krinsky, S.
name: Tazzari, S.
name: Vignola, G.
name: Wiedemann, H.
Publisher: name: INFN Open Access Repository
Year: 1986
Subjects: ADONE
Afrodite
G-75

description: Many lattices can be found that provide the defined emittance of less than 10°° m-rad at the design energy of 1.5 Gev.To evaluate their overall performance a large number of parameters has to be taken into account. Lengthy optimization procedures have also in general to be carried out to maximize the dynamic aperture. A single merit factor can not be easily constructed. In fact it is very likely that different combinations of parameters are required depending on the particular experimental situation. One general feature of the lattice can therefore be singled out as being of paramount importance: flexibility. A flexible lattice has good overall performance over a large range of tune settings, has no (or few) critical parameters and, in general, has degrees of freedom in excess of those necessary to determine its basic specifications (emittance, values of Twiss functions at various points, etc.); it can therefore be best tailored to the diverse requirements of the users while maintaining a satisfactory overall performance. Such lattices also seem to be more forgiving in the presence of magnet field and misalignment errors. When we classify the five lattices that were studied for the ALS - CG, TRA, FODO2, FODO3, ECG - in terms of flexibility we immediately identify two groups: CG, FODO3, and TBA, FODO2, ECG. The former are much less flexible than the latter. In particular as concerns CG, the lattice structure itself is such that practically all degrees of freedom are frozen once the emittance and the values of 𝛽x, 𝛽y in the straights have been fixed. The region of 𝛽-tron phases over which the chromaticity correcting sextupoles can be distributed is very narrow and almost exactly fixed. FODO3 has constant sextupoles integrated in the quadrupoles, so that, apart from the technical problems involved, flexibility is severely reduced. The board does therefore recommend that the study of the above two lattices be HET not further pursued. As concerns the remaining three lattices, they are essentially three different versions of a basic structure devised for the specific purpose of introducing the flexibility that is missing from the basic CG lattice. They are in different stages of optimization but potentially equally interesting. The board is therefore not prepared to establish a preference order before further study and optimization of the FODO and ECG versions have been carried out. However, it is the opinion of the board that, should a decision need to be taken urgently on the lattice on which to base the ALS complete design study, the TBA lattice, that seems to be in the most advanced stage of optimization and has satisfactory overall performance, should be selected, and could provide a sound basis for a detailed design and cost estimate, A final decision on the lattice, however, must be based on the demonstrated flexibility of a set of parameters as mentioned before and outlined below.
Neural Network Weights Do Not Converge to Stationary Points: An Invariant Measure Perspective
Creators: name: Zhang, Jingzhao
name: Li, Haochuan
name: Sra, Suvrit
name: Jadbabaie, Ali
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Optimization and Control (math.OC)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: This work examines the deep disconnect between existing theoretical analyses of gradient-based algorithms and the practice of training deep neural networks. Specifically, we provide numerical evidence that in large-scale neural network training (e.g., ImageNet + ResNet101, and WT103 + TransformerXL models), the neural network's weights do not converge to stationary points where the gradient of the loss is zero. Remarkably, however, we observe that even though the weights do not converge to stationary points, the progress in minimizing the loss function halts and training loss stabilizes. Inspired by this observation, we propose a new perspective based on ergodic theory of dynamical systems to explain it. Rather than studying the evolution of weights, we study the evolution of the distribution of weights. We prove convergence of the distribution of weights to an approximate invariant measure, thereby explaining how the training loss can stabilize without weights necessarily converging to stationary points. We further discuss how this perspective can better align optimization theory with empirical observations in machine learning practice.
The massive 3-loop operator matrix elements with two masses and the generalized variable flavor number scheme
Creators: name: Ablinger, J.
name: Blümlein, J.
name: De Freitas, A.
name: Goedicke, A.
name: Schneider, Carsten
name: Schönwald, K.
name: Wißbrock, F.
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2017

description: We report on our latest results in the calculation of the two--mass contributions to 3--loop operator matrix elements (OMEs). These OMEs are needed to compute the corresponding contributions to the deep-inealstic scattering structure functions and to generalize the variable flavor number scheme by including both charm and bottom quarks. We present the results for the non-singlet and $A_{gq,Q}$ OMEs, and compare the size of their contribution relative to the single mass case. Results for the gluonic OME $A_{gg,Q}$ are given in the physical case, going beyond those presented in a previous publication where scalar diagrams were computed. We also discuss our recently published two--mass contribution to the pure singlet OME, and present an alternative method of calculating the corresponding diagrams.
Absence of superdiffusion in certain random spin models
Creators: name: Claeys, Pieter W.
name: Lamacraft, Austen
name: Herzog-Arbeitman, Jonah
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The dynamics of spin at finite temperature in the spin-1/2 Heisenberg chain was found to be superdiffusive in numerous recent numerical and experimental studies. Theoretical approaches to this problem have emphasized the role of nonabelian SU(2) symmetry as well as integrability but the associated methods cannot be readily applied when integrability is broken. We examine spin transport in a spin-1/2 chain in which the exchange couplings fluctuate in space and time around a nonzero mean $J$, a model introduced by De Nardis et al. [Phys. Rev. Lett. 127, 057201 (2021)]. We show that operator dynamics in the strong noise limit at infinite temperature can be analyzed using conventional perturbation theory as an expansion in $J$. We find that regular diffusion persists at long times, albeit with an enhanced diffusion constant. The finite time spin dynamics is analyzed and compared with matrix product operator simulations.
description: 4+3 pages
Hertzog Leoboldt von Osterrych [erneumerrtt] 16 9Z
Creators: name: Rahn, Johann Rudolf
Publisher: name: [s.n.]
Year: 1859
Subjects: Schlacht bei Sempach
Königsfelden

description: [Johann Rudolf Rahn]
description: Skizze der Gedenktafel (Ausschnitt) in der Klosterkirche Königsfelden, die einen Teil der in der Schlacht von Sempach gefallenen Ritter zeigt
Edge physics at the deconfined transition between a quantum spin Hall insulator and a superconductor
Creators: name: Ma, Ruochen
name: Zou, Liujun
name: Wang, Chong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the edge physics of the deconfined quantum phase transition (DQCP) between a spontaneous quantum spin Hall (QSH) insulator and a spin-singlet superconductor (SC). Although the bulk of this transition is in the same universality class as the paradigmatic deconfined Neel to valence-bond-solid transition, the boundary physics has a richer structure due to proximity to a quantum spin Hall state. We use the parton trick to write down an effective field theory for the QSH-SC transition in the presence of a boundary. We calculate various edge properties in an $N\to\infty$ limit. We show that the boundary Luttinger liquid in the QSH state survives at the phase transition, but only as "fractional" degrees of freedom that carry charge but not spin. The physical fermion remains gapless on the edge at the critical point, with a universal jump in the fermion scaling dimension as the system approaches the transition from the QSH side. The critical point could be viewed as a gapless analogue of the quantum spin Hall state but with the full $SU(2)$ spin rotation symmetry, which cannot be realized if the bulk is gapped.
description: 9 pages + references
The Dusty Ism In Local Galaxies From (Sub-)Mm Observations
Creators: name: Bianchi Simone
Publisher: name: Zenodo
Year: 2017

description: In recent years, FIR and sub-mm observations have considerably improved

our knowledge of the dust component in local galaxies. Dust is found to scale

with the stellar mass and luminosity; it is closely associated to the atomic and

molecular gas content, and to the ISM metallicity. Yet there are still several

open questions, from its exact amount and optical properties, to its distribution

relative to the other galactic components, to its heating agents and the association

of dust emission and SFR. I will review our current understanding of these issues,

with a focus on submm observations from the Herschel Space Observatory.
Structure of the nearly-degenerate manifold of lattice quasiholes on a torus
Creators: name: Zeybek, Zeki
name: Umucalilar, Rifat Onur
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study the nearly-degenerate quasihole manifold of the bosonic Hofstadter-Hubbard model on a torus, known to host the lattice analog of the Laughlin state at filling fraction $ν= 1/2$. Away from $ν= 1/2$ and in the presence of both localized and delocalized quasiholes, the ratio between the numerically calculated many-body Chern number for certain groups of states and the number of states in the relevant group turns out to be constant for this manifold, which is also manifested in the density profile as the depleted charge of localized quasiholes. Inspired by a zero-mode counting formula derivable from a generalized Pauli principle, we employ a combinatorial scheme to account for the splittings in the manifold, allowing us to interpret some groups of states as the quasihole excitations corresponding to filling fractions lower than $ν= 1/2$. In this scheme, the many-body Chern number of subgroups appears as a simple combinatorial factor.
description: Published version; 6 + 4 pages, 4 figures
Математична модель розсіювання забруднюючих речовин в атмосфері за умов неперервних викидів від хімічно небезпечних об'єктів
Creators: name: О., Попов О.
name: В., Яцишин А.
name: О., Ковач В.
name: Краснов Є. Б.
name: В.О., Артемчук
Publisher: name: Zenodo
Year: 2017

description: Розроблено нову математичну модель забруднення атмосфери за умов неперервних викидів від хімічно небезпечних техногенних об’єктів.
Collective enhancement in dissipative quantum batteries
Creators: name: Carrasco, Javier
name: Maze, Jerónimo R.
name: Hermann-Avigliano, Carla
name: Barra, Felipe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study a quantum battery made out of $N$ non-mutually interacting qubits coupled to a dissipative single electromagnetic field mode in a resonator. We quantify the charging energy, ergotropy, transfer rate, and power of the system, showing that collective enhancements are still present despite of losses, and can even increase with dissipation. Moreover, we observe that a performance deterioration due to dissipation can be reduced by scaling up the battery size. This is useful for experimental realizations when controlling the quality of the resonator and the number of qubits are limiting factors.
description: Main content: 4.5 pages and 5 figures. Appendix content: 7 pages and 6 figures. In total (including references): 13 pages and 11 figures. Manuscript accepted to publish in Physical Review E
Probing material absorption and optical nonlinearity of integrated photonic materials
Creators: name: Gao, Maodong
name: Yang, Qi-Fan
name: Ji, Qing-Xin
name: Wang, Heming
name: Wu, Lue
name: Shen, Boqiang
name: Liu, Junqiu
name: Huang, Guanhao
name: Chang, Lin
name: Xie, Weiqiang
name: Yu, Su-Peng
name: Papp, Scott B.
name: Bowers, John E.
name: Kippenberg, Tobias J.
name: Vahala, Kerry J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Optical microresonators with high quality ($Q$) factors are essential to a wide range of integrated photonic devices. Steady efforts have been directed towards increasing microresonator $Q$ factors across a variety of platforms. With success in reducing microfabrication process-related optical loss as a limitation of $Q$, the ultimate attainable $Q$, as determined solely by the constituent microresonator material absorption, has come into focus. Here, we report measurements of the material-limited $Q$ factors in several photonic material platforms. High-$Q$ microresonators are fabricated from thin films of SiO$_2$, Si$_3$N$_4$, Al$_{0.2}$Ga$_{0.8}$As and Ta$_2$O$_5$. By using cavity-enhanced photothermal spectroscopy, the material-limited $Q$ is determined. The method simultaneously measures the Kerr nonlinearity in each material and reveals how material nonlinearity and ultimate $Q$ vary in a complementary fashion across photonic materials. Besides guiding microresonator design and material development in four material platforms, the results help establish performance limits in future photonic integrated systems.
description: Maodong Gao, Qi-Fan Yang and Qing-Xin Ji contributed equally to this work. 9 pages, 4 figures, 1 table
Struttura FODO per un booster per Afrodite (AFIN01)
Creators: name: Patteri, P.
Publisher: name: INFN Open Access Repository
Year: 1986
Subjects: ADONE
FODO
G-73

description: Afrodite è disegnata per realizzare un'emittanza di 2 - 4 x 10-9 mrad: questo dato, e l'opzione aperta tra l'uso di elettroni o positroni, pone le condizioni al contorno al disegno del sistema di iniezione. Si può pensare a una catena di iniezione costituita principalmente da un LINAC da 3ì250 MeV e un sincrotrone booster per iniettare in AFRODITE all'energia di lavoro (1500 MeV). Al booster si richiede all'energia finale un'emittanza ... mrad per aver euna buona efficienza di iniezione: nel caso venga deciso si lavorare con positroni si richiede inoltre una buona apertura dinamica a bassa energia con un'accettanza ..., per avere un'alta efficienza di cattura in RF del fascio del LINAC.
Thouless Pumps and Bulk-Boundary Correspondence in Higher-Order Symmetry-Protected Topological Phases
Creators: name: Wienand, Julian F.
name: Horn, Friederike
name: Aidelsburger, Monika
name: Bibo, Julian
name: Grusdt, Fabian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: The bulk-boundary correspondence relates quantized edge states to bulk topological invariants in topological phases of matter. In one-dimensional symmetry-protected topological systems (SPTs), quantized topological Thouless pumps directly reveal this principle and provide a sound mathematical foundation. Symmetry-protected higher-order topological phases of matter (HOSPTs) also feature a bulk-boundary correspondence, but its connection to quantized charge transport remains elusive. Here we show that quantized Thouless pumps connecting $C_4$-symmetric HOSPTs can be described by a tuple of four Chern numbers that measure quantized bulk charge transport in a direction-dependent fashion. Moreover, this tuple of Chern numbers allows to predict the sign and value of fractional corner charges in the HOSPTs. We show that the topologically non-trivial phase can be characterized by both quadrupole and dipole configurations, shedding new light on current debates about the multi-pole nature of the HOSPT bulk. By employing corner-periodic boundary conditions, we generalize Restas's theory to HOSPTs. Our approach provides a simple framework for understanding topological invariants of general HOSPTs and paves the way for an in-depth description of future dynamical experiments.
description: 4 pages, 4 figures plus supplements
Considerazioni sulla estrapolazione di un P collier a 50 TeV
Creators: name: Tazzari, S.
Publisher: name: INFN Open Access Repository
Year: 1986
Subjects: ADONE
G-72

description: (...) Dalla (6) segue che per mantenere invariata la densità lineare di potenza della luce di sincrotrone occorre scalare il campo inversamente con l'energia e quindi il raggio di curvatura con il quadrato dell'energia. È questa una legge ben nota per le macchine ad elettroni che sono dominate dall'irraggiamento. Un altro possibile criterio è quello di minimizzare la potenza totale da smaltire a bassa temperatura. Questa ha due termini: la potenza dalla radiazione di sincrotrone e quella dovuta alle perdite di calore (...).
Integration von Risiken in Geschäftsprozessmodelle zur Gestaltung eines betrieblichen Informationssystems
Creators: name: Anton, Tobias Thomas
Publisher: name: Technische Universität Dortmund
Year: 2018
Subjects: subject: Risikomanagement-Informationssysteme
subject: Risiko
subject: Risikomanagement
subject: Geschäftsprozesse
subject: Geschäftsprozessmanagement
subject: BPMN
subject: 330
subject: 300
subject: Risikomanagement
subject: Prozesskette
subject: Prozessmanagement
subject: BPMN

description: Die Koordinierung der Wertschöpfungsaktivitäten vieler Unternehmen erfolgt heutzutage in einer geschäftsprozessorientierten Vorgehensweise. Geschäftsprozessmanagementsysteme zur Steuerung der Prozesse haben sich daher als ein Führungsinstrument etabliert. Die Betrachtung von Unsicherheiten in den betrieblichen Abläufen wird von diesen Systemen vernachlässigt. Aus Sicht des Risikomanagements gewinnt die Risikoanalyse auf Geschäftsprozessebene jedoch zunehmend an Bedeutung. Die Dissertation schließt die Lücke einer engeren Verzahnung von Prozess- und Risikomanagement, indem der internationale Standard zur Modellierung von Geschäftsprozessen, die Business Process Model and Notation (BPMN), so erweitert wird, dass die Modellierung von Risikophänomenen in Geschäftsprozessmodellen möglich ist. Aufgrund der mangelnden Unterstützung bestehender Risikomanagement-Informationssysteme zur Verwaltung von Prozessrisiken, wird in der Arbeit ein Informationssystem konzipiert, welches die Identifizierung, Erfassung, Quantifizierung, Steuerung, Überwachung und das Reporting von Risikophänomenen in Geschäftsprozessen unterstützt. Den Kern des Informationssystems bilden BPMN Prozessmodelle die auf Basis der in der Arbeit konzipierten Risikomodellierung mit Risikoinformationen angereichert werden können. Das Informationssystem ist in der Lage, die Analyse, die Steuerung und das Reporting von Risiken auf Geschäftsprozessebene nahezu in Echtzeit vorzunehmen, da es an belegorientierte betriebliche Informationssysteme, wie z. B. ein ERP System, über Schnittstellen angebunden werden kann.
Crocidura greenwoodae Heim de Balsac 1966
Creators: name: Mittermeier, Russell A.
name: Wilson, Don E.
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Soricomorpha
Soricidae
Crocidura
Crocidura greenwoodae

description: 318. Greenwood’s White-toothed Shrew Crocidura greenwoodae French: Crocidure de Greenwood / German: Greenwood-WeiRzahnspitzmaus / Spanish: Musarana de Greenwood Other common names: Greenwood’s Shrew Taxonomy. Crocidura greenwoodi [sic] Heim de Balsa, 1966, Gelib, Somalia. Widely used species name greenwood: has been changed as the species was named after Mrs. [Marjorie] Greenwood and according to the article 31.1.2 of the International Code of Zoological Nomenclature the ending “ae” is mandatory for a name honoring a woman. Seems to be closely related to C. fulvastra and C. hirta, based on their same karyotype, although detailed molecular studies are needed. Monotypic. Distribution. Recorded only from two localities in S Somalia. Descriptive notes. Head-body 71 mm, tail 51 mm, hindfoot 13 mm (one specimen). No specific data are available for body weight. Greenwood’s White-toothed Shrew is a medium-sized shrew. Dorsal pelage is gray, tinged with brown, and ventrum is whitish with basally gray hairs. Feet are grayish. Tail is long (c.72% of head-body length), thick, grayish, and covered in long bristle hairs. Braincase is broad and flattened; the second and third unicuspids are subequal in size; M? is medium in size; talonid of M, with a talonid basin and small or absent entoconid. There are three unicuspids. Chromosomal complement is 2n = 50, FN = 66. Habitat. Recorded from gallery forest, savanna, arid bush, and cultivated land. Food and Feeding. No information. Breeding. No information. Activity patterns. Greenwood’s White-toothed Shrews are terrestrial. Movements, Home range and Social organization. No information. Status and Conservation. Classified as Least Concern on The IUCN Red List. Greenwood’s White-toothed Shrew is apparently locally common but known from few specimens with no identified major threats, although Somalia is a very unstable country, which limits the knowledge available for this species. Bibliography. Heim de Balsac & Meester (1977), Hutterer (2016b), Jenkins & Churchfield (2013d), Schlitter et al. (1999).
description: Published as part of Russell A. Mittermeier & Don E. Wilson, 2018, Soricidae, pp. 332-551 in Handbook of the Mammals of the World – Volume 8 Insectivores, Sloths and Colugos, Barcelona :Lynx Edicions on page 509, DOI: 10.5281/zenodo.6870843
The Workers' Educational Association and the Pursuit of Oxford Idealism, 1909-1949
Creators: name: Lee, Chih-Hao
Publisher: name: Apollo - University of Cambridge Repository
Year: 2018
Subjects: Idealism
Professionalism
Adult Education
Workers' Educational Association
Citizenship
Participatory Democracy
Education Reform

description: This study examines the practical application of Oxford Idealism to education reform and the adult education movement. According to Idealist philosophy, enlightened and active citizenship was the cornerstone of a participatory democracy. This thesis thus explores how Oxford Idealists used the Workers’ Educational Association (WEA) to pursue the aim of cultivating good citizenship and forming a common purpose for the future society they wished to see emerging. The WEA, founded in 1903, embodied the Idealist vision by promoting its two-fold practices: first, it organised university tutorial classes to foster mutual learning and fellowship between intellectuals and workers; second, it campaigned for a state-funded ‘educational highway’, from nursery to university, so that every citizen would have the opportunity to receive the kind of liberal education which had hitherto been limited to upper and middle classes. By exploring the development of the dual initiative, this thesis examines the achievement and limitations of the Idealist project. In particular, it investigates whether and how this pursuit, in the long run, contributed to the rise of professionalism, a trend which has been ascribed to the efforts of Idealists but which in many ways contradicted the ideal of participatory democracy. In so doing, this thesis explains why the influence of Oxford Idealism—this highly moralistic philosophy which inspired a generation of intellectuals and politicians and lent a distinctive flavour to British public policy at the beginning of the twentieth century—gradually ebbed in the public domain.