cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The growth rate of an entire function and the Hausdorff dimension of its Julia set
Creators: name: Bergweiler, Walter
name: Karpińska, Bogusława
name: Stallard, Gwyneth M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Complex Variables (math.CV)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37F10; 37F35; 30D05; 30D15

description: Let f be a transcendental entire function in the Eremenko-Lyubich class B. We give a lower bound for the Hausdorff dimension of the Julia set of f that depends on the growth of f. This estimate is best possible and is obtained by proving a more general result concerning the size of the escaping set of a function with a logarithmic tract.
description: 19 pages
Effective Theory Approach to W-Pair Production near Threshold
Creators: name: Schwinn, Christian
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this talk, I review the effective theory approach to unstable particle production and present results of a calculation of the process e- e+ ->mu- nubar_mu u dbar X near the W-pair production threshold up to next-to-leading order in GammaW/MW ~ alpha ~ v^2. The remaining theoretical uncertainty and the impact on the measurement of the W mass is discussed.
description: 7 pages (ilcws07.cls included), to appear in the proceedings of the International Linear Collider Workshop (LCWS/ILC07), 30 May - 3 Jun 2007, Hamburg, Germany
Interconnected bureaucracies? Comparing online and offline networks during global climate negotiations
Creators: name: Goritz, Alexandra
name: Jörgens, Helge
name: Kolleck, Nina
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: climate governance
subject: international public administration
subject: social network analysis
subject: survey data
subject: Twitter data
subject: United Nations Framework Convention on Climate Change
subject: 300 Sozialwissenschaften::350 Öffentliche Verwaltung, Militärwissenschaft::350 Öffentliche Verwaltung, Militärwissenschaft

description: Measuring the influence of international public administrations has traditionally been conducted with ‘offline’ data, using interviews, surveys or official documents. However, an emerging strand of the literature argues that influence can also be observed ‘online’, with data based on online social networks, such as Twitter. Our contribution aims at bringing these two strands closer together. We triangulate offline data from a large-N survey with online data from Twitter to examine to what extent they provide distinct theoretical and methodological insights into the role of international public administrations in global governance. As a case study, we use the policy area of global climate governance, an issue area where the influence of international public administrations has raised increasing scholarly interest. Our findings show that international public administrations occupy potentially influential positions in both ‘offline’ and ‘online’ networks. They are more often central actors in the survey network than in Twitter network, but in both networks, they constitute the primary source of issue-specific information. Points for practitioners First, online social networks provide practitioners with opportunities to connect and interact with other political actors and help shape public discourse through communication. Second, online social networks provide important forums for societal actors who aim to protect global public goods. Third, online social networks offer actors the opportunity to shape values and norms, and to persuade persons or organizations beyond one’s own circle. Therefore, it is particularly important that online communication strategies are carefully designed and implemented in view of their potential power.
Anisotropies in the Cosmic Neutrino Background after WMAP 5-year Data
Creators: name: De Bernardis, Francesco
name: Pagano, Luca
name: Serra, Paolo
name: Melchiorri, Alessandro
name: Cooray, Asantha
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We search for the presence of cosmological neutrino background (CNB) anisotropies in recent WMAP 5-year data using their signature imprinted on modifications to cosmic microwave background (CMB) anisotropy power spectrum. By parametrizing the neutrino background anisotropies with the speed viscosity parameter $c_\vis$, we find that the WMAP 5-year data alone provide only a weak indication for CNB anisotropies with $c_\vis^2 > 0.06$ at the 95% confidence level. When we combine CMB anisotropy data with measurements of galaxy clustering, SN-Ia Hubble diagram, and other cosmological information, the detection increases to $c_\vis^2 > 0.16$ at the same 95% confidence level. Future data from Planck, combined with a weak lensing survey such as the one expected with DUNE from space, will be able to measure the CNB anisotropy parameter at about 10% accuracy. We discuss the degeneracy between neutrino background ansiotropies and other cosmological para meters such as the number of effective neutrinos species and the dark energy equation of state.
description: 7 Pages, 7 Figures
Materiali metallici in ambienti corrosivi alle alte temperature: confronti e impieghi
Creators: name: Rossi, Lorenzo
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Le applicazioni industriali che richiedono materiali resistenti ad elevate temperature sono molteplici e non sempre è facile scegliere il materiale più idoneo per ogni applicazione.
In questo lavoro si è posto una particolare attenzione al degrado delle leghe di metallo alle alte temperature.  In generale, le leghe metalliche possono essere ottenute direttamente come getto di fonderia, oppure mediante lavorazioni successive effettuate su un getto di partenza.
Ogni elemento costitutivo della lega ha determinate caratteristiche e proprietà come: il punto di fusione, il punto di ebollizione, la struttura atomica, la configurazione microcristallina, la densità etc.; ciò equivale a dire che i materiali alliganti rispondono in modo differente alle esigenze della lega, potendone influenzare il comportamento, e nel caso in discussione, con lo scopo ben preciso di aumentarne l’efficacia alle alte temperature. Una corretta progettazione, congiuntamente alla scelta del materiale più adatto, può essere decisiva nella prevenzione della corrosione e dell’ossidazione
Ruolo dei fattori di trascrizione Pbx1 e Pbx2 nella morfogenesi degli arti
Creators: name: Di Giacomo, Giuseppina
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Lo sviluppo degli arti dei vertebrati avvien lungo tre assi: prossimo-distale (PD), antero-posteriore (AP) e dorso-ventrale. La specificazione di tali assi e’ regolata da centri organizzativi quali la ZPA (zona ad attivita’ polarizzante) e l’AER (cresta apicale ectodermica). In particolare lo sviluppo prossimo-distale necessita della formazione di un feedback loop tra Shh, espresso nella ZPA, e l’AER.
La famiglia dei Pbx include quattro geni: Pbx1, Pbx2, Pbx3 e Pbx4 (Selleri et al. 2001; Selleri et al. 2004; Rhee et al. 2004; Monica et al. 1991; Popperl et al. 2000).E’ stato dimostrato che Pbx1 e’ necessario durante l’organogenesi e lo sviluppo dello scheletro sia assiale che appendicolare (Selleri et al, 2001). In particolare topi knockout per Pbx1 mostrano difetti morfologici a carico dei cingoli scapolari e pelvici, dello sviluppo dello stilopodio sia anteriore che posteriore (omero e femore), mentre la regione distale degli arti (zugopodio ed autopodio) non sembra essere affetta. In questa tesi dimostriamo che Pbx2 e’ espresso, durante le prime fas della morfogenesi degli arti, in tutto il mesoderma, Tale risultato suggerisce la presenza di un “Pbx code” lungo gli assi AP e PD con funzioni Pbx1/ Pbx2 sovrapposte e complementari. Tale evidenza e’ ulteriormente avvalorata dal fenotipo ottenuto negli embrioni doppi mutanti Pbx1-/-;Pbx2-/- in cui si ha la completa assenza di arti sia anteriori che posteriori. Il fenotipo invece caratterizzante gli embrioni Pbx1-/-;Pbx2+/- fornisce un valido modello per studiare i meccanismi alle base dello sviluppo degli arti. Tali embrioni, infatti, mostrano difetti scheletrici sia assiali che appendicolari molto piu’ severi di quelli riscontrati negli embrioni Pbx1-/- nonchè una letalità, precoce (E13.5) rispetto ai Pbx1-/- , ma più avanzata rispetto ai doppi mutanti omozigoti (E10.5), permettendone quindi uno studio piu’ approfondito. Tale studio indica che nei vertebrati, a differenza di quanto avviene in Drosophila, lo sviluppo distale degli arti e’ Pbx1/Pbx2-dipendente. Il ruolo dei Pbx in tale processo e’ mediato , almeno a livello degli arti posteriori, dal controllo gerarchico che, tali proteine, esercitano sulla distrubuzione dei trascritti dei geni Hox e di Shh. In generale, i dati ottenuti durante il periodo del dottorato, dimostrano che, a livello degli arti posteriori, attraverso il controllo della distribuzione degli Hox e la regolazione della ZPA, Pbx1/Pbx2 esercitano una funzione gerarchica sui geni Hox piuttosto che fungere esclusivamente da loro cofattori.
Room temperature soft ferromagnetism in the nanocrystalline form of YCo2 - a well-known bulk Pauli paramagnet
Creators: name: Jammalamadaka, S. Narayana
name: Sampathkumaran, E. V.
name: Murthy, V. Satya Narayana
name: Markandeyulu, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The Laves phase compound, YCo2, is a well-known exchange-enahnced Pauli paramagnet. We report here that, in the nanocrystalline form, this compound interestingly is an itinerant ferromagnet at room temperature with a low coercive-field. The magnitude of the saturation moment (about 1 Bohr-magneton per formula unit) is large enough to infer that the ferromagnetism is not a surface phenomenon in these nanocrystallites. Since these ferromagnetic nanocrystallines are easy to synthesize with a stable form in air, one can explore applications, particularly where hysteresis is a disadvantage.
اللغة العربية وتلقّيها في "العصر الرقمي" (في تحديات القراءة والكتابة والإعلام والتعلّم) د. كامل فرحان صالح
Creators: name: Saleh, Kamel farhan
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 470317
subject: Middle Eastern languages

description: مستخلص: اللغة العربية وتلقّيها في "العصر الرقمي" (في تحديات القراءة والكتابة والإعلام والتعلّم)أ. د. كامل فرحان صالح (kamel farhan saleh)يجد المرء نفسه غير قادر على وضع مفهوم يطمئن إليه، للغة، أمام التحولات الثقافية الهائلة التي بدأت تتسارع على غير صعيد منذ أواخر القرن العشرين، كون هذه اللغة الحامل التقليدي للتعبير الإنساني، واللازمة حكمًا لمسألتي الإعلام والتعلّم، وكونها في الأساس "مجموع الألفاظ والقواعد التي تتعلق بوسيلة التخاطب والتفاهم بين جماعة من الناس".فهل اللغة العربية اليوم التي يتكلم بها نحو 800 مليون إنسان بوصفها لغة أولى أو ثانية، تعبّر عن "واقع الفئة الناطقة بها، ونفسيتها، وعقليتها، وطبعها، ومناخها الاجتماعي والتاريخي"؟إن طرح هذا السؤال، يدفع المرء إلى طرح أسئلة أخرى على خلفية التحديات الشرسة التي تواجه اللغة من قوى العولمة (Globalization) المتمثلة في المصالح المادية الناجمة عن الاتصال بالأجنبي، والتأثير الإعلامي القائم على "الصخب والضجيج، والتبشير باللغة الإنكليزية على أنها اللغة العالمية"، (وهي كذلك لأنها لغة من ينتج العلم والتقنية)، ومن هذه الأسئلة:هل يكفي الإنسان العربي اليوم أن يردد ما يقوله دارسو اللغة: ان اللغة العربية أرقى اللغات السامية، وتحفل بثروة من الألفاظ والمترادفات، مدللين على صحة هذه الثروة بأن في المهجور من ألفاظ العربية "سبعين ألف مادة لم تستعمل إلى اليوم"، وأن للعسل ثمانين اسمًا، وللثعبان مائتين، وللأسد خمسمائة، وللجمل ألف، وللسيف ألف كذلك، وللداهية أربعة آلاف اسم، وأن اللغة العربية في العصور الغابرة، أثرّت في اللغات الأخرى: أمثال الفارسية، والإسبانية، والفرنسية، والايطالية، والصقليّة، والإنكليزية، والتركية...، وغيرها؟لا يكتفي هؤلاء الدارسون بترداد هذا فحسب، بل يحسبون أن هذه اللغة إن كانت "لا تواتي بعض حاجات المخترعين، فليس العيب فيها، وإنما العيب واقع على أبنائها الذين أهملوها، ولم يفتشوا عن ثرواتها الضخمة في كل علم وفن"، مضيفين ان اللغة العربية ليست غنية في مفرداتها فحسب، ولكنها غنية في صيغ قواعدها أيضًا، وتمتاز بضروب كثيرة من أسباب النمو التي منها: الاشتقاق والمجاز، ويستعيدون في هذا السياق، مديح عشرات المستشرقين للغة العربية، من أمثال:الألماني تيودور نولدكه (Theodor Noldeke) (1836- 1930)، والفرنسي إرنست رينان (Ernest Renan) (1833 – 1892)، وغيرهما.♦ ظاهرة "خلطة الكتابة" العجيبة أمام هذا الوضع، حيث يندر أن يجدّ القارئ بحثًا عن اللغة العربية من دون أن يردد كاتب البحث أو الكتاب، كلماتٍ تمجد اللغة العربية، والمركز العالمي الذي حازته قديمًا، يلمس المرء على أرض الواقع، أن الهوة تتسع بين اللغة العربية والأجيال الجديدة، ولاسيما في السنوات الأخيرة، بعدما تفشت ظاهرة "خلطة الكتابة" العجيبة - إذا صحّ التعبير –، وهي عبارة عن كتابة الحرف العربي بحروف وأرقام أجنبية، بين شريحة واسعة من الشعوب العربية، ولا سيما بين الطلاب في المراحل التعليمية المختلفة، إذ إن هؤلاء لا يشوهون اللغة العربية الفصحى فحسب، بل يشوهون اللغة العامية أيضًا، ما يشكّل قطيعة بين هؤلاء وحياتهم، وواقعهم، ويومياتهم، فضلا عن قطيعتهم الكبرى مع تراثهم العربي.
How Close are Compact Multi-Planet Systems to the Stability Limit?
Creators: name: Yee, Samuel W.
name: Tamayo, Daniel
name: Hadden, Samuel
name: Winn, Joshua N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Transit surveys have revealed a significant population of compact multi-planet systems, containing several sub-Neptune-mass planets on close-in, tightly-packed orbits. These systems are thought to have formed through a final phase of giant impacts, which would tend to leave systems close to the edge of stability. Here, we assess this hypothesis, comparing observed eccentricities in systems exhibiting transit-timing variations (TTVs), with the maximum eccentricities compatible with long-term stability. We use the machine-learning classifier SPOCK (Tamayo et al. 2020) to rapidly classify the stability of numerous initial configurations and hence determine these stability limits. While previous studies have argued that multi-planet systems are often maximally packed, in the sense that they could not host any additional planets, we find that the existing planets in these systems have measured eccentricities below the limits allowed by stability by a factor of 2--10. We compare these results against predictions from the giant impact theory of planet formation, derived from both $N$-body integrations and theoretical expectations that in the absence of dissipation, the orbits of such planets should be distributed uniformly throughout the phase space volume allowed by stability. We find that the observed systems have systematically lower eccentricities than this scenario predicts, with a median eccentricity about 4 times lower than predicted. These findings suggest that if such systems formed through giant impacts, then some dissipation must occur to damp their eccentricities. This may take place during formation, perhaps through interactions with the natal gas disk or a leftover population of planetesimals, or over longer timescales through the coupling of tidal and secular processes.
description: 14 pages, 7 figures, 1 machine-readable table. Accepted to AJ
Il contributo della geologia e della geomorfologia all’individuazione e valorizzazione dei beni ambientali: esempi nei Campi Flegrei
Creators: name: Esposito, Carmela
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Questo lavoro di dottorato si propone di individuare i beni ambientali a carattere geologico nell’area dei Campi Flegrei, in Campania, e si propone di offrire strumenti utili alla tutela, alla valorizzazione e alla divulgazione del suo patrimonio geologico.
Vengono selezionati i siti di interesse geologico, o geositi, con particolare valenza didattica e scientifica.
Per siti d’interesse geologico con valenza didattica e scientifica s’intendono tutte quelle località in cui alcuni processi o morfologie geologiche, che presentano un certo interesse scientifico, sono esposti e rappresentati in modo tale da poter rendere l’evento geologico visibile e leggibile da tutti.
I siti selezionati sono 57 e sono rappresentativi dei più importanti fenomeni geologici e vulcanici avvenuti nell’area e di cui si conservano testimonianze. Le tipologie che li rappresentano abbracciano il campo di studio della vulcanologia, della stratigrafia, della geologia applicata, dell’idrogeologia, della mineralogia e della geomorfologia; non mancano inoltre siti che mostrano ancora oggi un rilevante interesse naturalistico e in cui inevitabilmente, da un certo momento della storia dell’area, si intreccia la vita dell’uomo con quella della natura. Comprendono inoltre non solo “luoghi” da visitare da vicino, ma anche paesaggi e morfologie da osservare a distanza. Particolari siti scelti sono infatti i “punti di belvedere”, in cui il sito viene ad essere un punto di osservazione e non l’oggetto dell’osservazione.
In base alle differenti tipologie di geositi scelti abbiamo:
	siti rappresentativi della storia vulcanologica dell’area;
	siti rappresentativi dei fenomeni vulcanici;
	siti rappresentativi dei processi geomorfologici;
	siti rappresentativi di processi geologici;
	siti che costituiscono dei punti di osservazione.
I geositi selezionati sono stati successivamente inseriti all’interno di un database strutturato in maniera tale da fornire tutte le informazioni necessarie per la loro caratterizzazione.
Ogni sito è stato successivamente inserito all’interno di un sistema informatico geografico (GIS).
Si è proceduto successivamente a realizzare un collegamento diretto tra il GIS e il database. Questi due prodotti informatrici sono stati pensati e strutturati come strumenti utili alla divulgazione e alla valorizzazione del territorio flegreo.
Accanto a questi prodotti si è proceduto alla strutturazione di itinerari di fruizione dei geositi flegrei, alla realizzazione di una carta geomorfologica e geologica divulgativa e alla realizzazione di due filmati che hanno lo scopo di far comprendere attraverso sequenze di immagini l’evoluzione che il territorio flegreo ha subito durante gli ultimi 12.000.
Tutti questi elaborati vogliono essere dei potenziali e reali strumenti per una migliore comprensione dell’unicità di questo territorio.
Synthesis, characterization, and reactivity with dioxygen, of Ru(OEP)(DPS)₂ and Ru(OEP)(DecMS)₂ [OEP= dianion of octaethylporphyrin; DPS= diphenylsulphide; DecMS= decylmethylsulphide]
Creators: name: Pacheco-Olivella, Arsenio Andrew
Publisher: name: University of British Columbia
Year: 2010

description: The complexes Ru(OEP)(DPS)₂ (1) and Ru(OEP)(DecHS)₂ (2) were prepared in vacuo on a 100-mg scale by treatment of the dimeric species [Ru(OEP)]₂ (3) with a CH₂CI₂ solution containing a slight excess of the appropriate thioether [OEP= dianion of octaethylporphyrin; DPS= diphenylsulphide; DecMS= decylmethylsulphide]. In vacuo recrystallization, from n-heptane in the case of 1, and from n-pentane/methanol for 2, gave analytically pure material in 40 and 80 % yields, respectively. Both products were characterized by X-ray diffraction analysis, uv/vis absorption and nmr spectrometry, as well as elemental analysis. Variable temperature nmr studies were carried out with both complexes. JL was found to be in thermodynamic equilibrium with 3, the dimer being favoured at about 80° C, and 1 at lower temperatures. Sharp nmr signals for the OEP protons of both equilibrating species, even at 80° C, indicated that exchange between them was slow on the nmr time scale; but, broadening and eventual coalescence at 80° C of the nmr signals for free and coordinated DPS suggested that the axial ligands of JL were quite labile. Cooling solutions of 2 caused the thioether methylene signals to broaden, and at -60° C the signals due to the methylenes closest to the sulphur split into broad doublets, this resulting from the prochiral nature of DecMS. The fact that only one nmr signal was observed for these methylene protons at room temperature implies rapid alternate coordination of the sulphur lone pairs. The crystal structures of 1 and 2 revealed Ru-S bond lengths typical of Ru complexes containing trans-thioethers. The bond distances and angles of the porphyrin core were typical of those of monomeric Ru(Porp) complexes. Dv/vis absorption, and nmr spectrometric studies, showed that 1 was extremely air-sensitive in solution, readily giving [Ru(OEP)OH]₂O and free DPS. Dv/vis absorption, nmr, and gc/mass spectrometric studies revealed that 2 reacted with dioxygen over a period of months to give Ru(OEP)(DecMS)(DecMSO) and Ru(OEP)(DecMSO)₂ as major products, as well as Ru(OEP)(CO)L (L= DecMS and DecMSO), and two other unidentified Ru(Porp) complexes as minor by-products [DecMSO= decylmethylsulphoxide]. In the presence of excess DecMS 2 catalyzed slow autoxidation of the free ligand to give DecMSO, DecMSO₂, and didecyldisulphide; the rate of this reaction was increased by addition of small quantities of HOAc [DecMSO₂ = decylmethyl-sulphone]. A major Ru(Porp) end-product both in the presence and absence of HOAc was Ru(OEP)(CO)L, the CO coming from Ru[sup II] (Porp)-mediated decarbonylation reactions.
L’evoluzione morfotettonica plio-quaternaria del sistema Golfo di Salerno-Piana del Sele-Monti Picentini  (Appennino Meridionale)
Creators: name: Vitale, Carmine
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: I nuovi dati raccolti con la presente ricerca di tesi e la rielaborazione di quelli precedenti,  in un’ottica di analisi comparata, lungo l’intero transetto Golfo di Salerno -Piana del Sele - Monti Picentini, ha consentito di cogliere alcune interessanti correlazioni di ampio raggio e di stabilire nuovi vincoli circa la cronologia, la distribuzione e l’entità dei moti verticali (assoluti e relativi),  che hanno interessato il sistema Graben-Horst considerato fin dalla fine del Miocene.
La vastità e la complessità del tema affrontato, unitamente alla impossibilità ad effettuare nuove datazioni assolute per cause economiche, hanno però limitato il successo dello studio condotto, per cui rimangono alcuni aspetti non chiariti in modo soddisfacente.
Tra i principali risultati raggiunti si ricordano:
1) la definizione semiquantitativa delle varie fasi di sollevamento subite dal massiccio dei Monti Picentini (e dalla fascia collinare che lo separa dalla Piana del Sele) fin dall’atto della sua definitiva emersione dal mare con i bacini tardo-orogeni  (poche centinaia di metri fino al Pliocene Inferiore; ulteriori 500 metri circa nel corso del Pleistocene inf.; altri 500 metri nel corso del tardo Pleistocene inf.; fino a 400 metri nel Pleistocene medio; a partire dal Tirreniano nella Piana un sollevamento di circa 20 metri).
2) La presenza di due ordini di paleosuperfici (PS1 e PS2), inquadrate rispettivamente  nel Pliocene superiore - Pleistocene inferiore e verso la fine del Pleistocene, che ha consentito di discriminare eventi di fagliazione, occorsi prima e dopo il loro modellamento (estensione N-S lungo faglie ad alto angolo prima del modellamento della PS1; faglie ad alto angolo orientate in modo complesso con tratti NW-SE, NE-SW, E-W e N-S, aventi  rigetti fino a 500 m e causanti diffusi fenomeni di basculamento, tra PS1 e PS2; fagliazione ad alto angolo lungo linee di direzione prevalente NW-SW, senza mancare quelle orientate NE-SW, NNW-SSE e E-W con rigetti su singola faglia fino a 200 m e complessivi pari a circa 500 m dopo il modellamento della PS2).
3) La correlazione di alcuni degli eventi registrati a terra con quelli registrati nel Golfo di Salerno (comune legame con la fase estensionale guidata da estensione pleistocenica NW-SE; riconoscimento di due fasi di subsidenza accelerata nel Golfo e loro correlazione con i cicli deposizionali dei Conglomerati di Eboli e del Supersintema Battipaglia-Persano).
4) Il chiarimento degli eventi tettonici che accompagnano l’evoluzione della Piana del Sele dal Pleistocene medio all’Olocene (riperimetrazione tettonica del depocentro ad opera di faglie connesse alla estensione NW-SE; subsidenza iniziale seguita da lento sollevamento e progradazione tra il tardo Pleistocene medio e il Pleistocene superiore; sostanziale stabilità tettonica olocenica)
Supersolitons: Solitonic excitations in atomic soliton chains
Creators: name: Novoa, David
name: Malomed, Boris A.
name: Michinel, Humberto
name: Perez-Garcia, Victor M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We show that, by appropriately tuning physically relevant interactions in two-component nonlinear Schrodinger equations, it is possible to achieve a regime with particle-like solitonic collisions. This allows us to construct an analogue of the Newton's cradle and also to create localized collective excitations in solitary-wave chains which are quasi-integrable solitons, i.e. supersolitons. We give a physical explanation of the phenomenon, support it with a perturbative analysis, and confirm our predictions by direct simulations.
Una, nessuna e centomila memorie: ricordi individuali e memorie
collettive della strage sul treno rapido 904 del 23 dicembre 1984
Creators: name: Iannicelli, Gianpaolo
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Il 23 dicembre del 1984 a causa di una bomba esplosa sul treno rapido 904 in servizio da Napoli a Milano persero la vita 16 persone, mentre altre 267 rimasero più o meno gravemente ferite.
I famigliari delle vittime e i superstiti – molti dei quali napoletani o campani – si organizzarono in associazione già dopo pochi mesi dall’evento, si costituirono parte civile nel processo, esercitando fin da subito i loro diritti/doveri di cittadini e commemorando ogni anno le vittime.
Eppure, anche se negli ultimi anni si assiste a un coinvolgimento crescente della società civile e delle istituzioni durante i cerimoniali commemorativi e a un appoggio più concreto alle iniziative dell’associazione, da un lato l’evento in questione sembra debolmente radicato nella coscienza collettiva locale e, a maggior ragione, in quella nazionale; dall’altro, esso è stato dimenticato anche dalla comunità scientifica per quel che riguarda le scienze storico-sociali. Ciò ha rappresentato proprio l’ipotesi di partenza che con la presente ricerca si è cercato di controllare empiricamente. In altre parole, ci si è chiesti come mai un evento così importante della storia recente del nostro paese, in un’epoca in cui si commemora di tutto, è stato, in pratica, rimosso, dimenticato, “dislocato”, e quali sono i processi socio-culturali, i soggetti civili e istituzionali e le tensioni tra le diverse forze sociali in campo che, interagendo nello spazio pubblico, hanno determinato tale stato di cose.
Il degrado del cemento armato: dinamiche, recupero e prevenzione
Creators: name: Traettino, Emilio
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Il cemento armato, dopo circa un secolo di vita, ha manifestato la sua vulnerabilità all’azione del tempo, degli agenti atmosferici, dei terremoti. Le proporzioni del fenomeno impediscono qualunque tentativo di soluzione basato sulla sostituzione programmata delle costruzioni esistenti, perciò, in questi anni, è crescente l’interesse per il degrado ed il recupero delle strutture in cemento armato sia per salvaguardare il patrimonio edilizio esistente sia, quando risulti necessario, per aumentarne i coefficienti di sicurezza strutturale. Ciò sta convincendo i tecnici che non basta più progettare tradizionalmente le strutture in c.a., basandosi essenzialmente sulla verifica meccanica delle sezioni. Si affronta il problema della diffusione di una nuova concezione del cemento armato, più completa ed articolata, che porti a scegliere i materiali anche in base alla durabilità e non più solo sulla resistenza
Addendum to: Combined Constraints on First Generation Leptoquarks
Creators: name: Crivellin, Andreas
name: Schnell, Luc
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In this addendum to arXiv:2101.07811 we discuss the implications of the recent CMS analysis of lepton flavour universality violation in non-resonant di-lepton pairs for first generation leptoquarks. As CMS finds more electron events than expected from background, this analysis prefers the LQ representations $\tilde{S}_1, S_2, S_3, \tilde{V}_1, V_2\,(κ_2^{RL}\ne 0)$ and $V_3$ which lead to constructive interference with the SM. In principle the excess could also be (partially) explained by the representations $\tilde{S}_2, V_1\,(κ_1^R\ne 0), V_2\,(κ_2^{LR}\ne 0), \tilde{V}_2$ which are interfering destructively, as this would still lead to the right effect in bins with high invariant mass where the new physics contribution dominates. However, in these cases large couplings would be required which are excluded by other observables. The representations $S_1, V_1\, (κ_1^{L} \ne 0)$ cannot improve the fit to the CMS data compared to the SM.
description: 8 pages, 3 figures, 3 tables
Superfici mutevoli: le tecnologie innovative dei vetri cromogenici per il progetto di involucri a prestazioni variabili
Creators: name: Claudi De Saint Mihiel, Alessandro
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: La tesi di dottorato ha approfondito lo studio delle tecnologie per la mutevolezza delle superfici degli edifici ed in particolare l’applicazione in campo architettonico delle tecnologie cromogeniche per le superfici trasparenti..
Tale studio è partito dal presupposto che, nella continua evoluzione di materiali e tecniche di produzione, le superfici trasparenti sono state oggetto in questi ultimi anni di specifiche innovazioni radicali nel campo delle tecnologie del vetro e di significative e poco note innovazioni incrementali, attraverso l’integrazione con altre tecnologie appartenenti a diversi settori in cui l’innovazione risultava più spinta quali quelli della chimica applicata, della fisica e dell’ingegneria elettrica.
Nella tesi di dottorato si è contribuito alla sistematizzazione e alla definizione di quadri di classificazione delle tecniche di realizzazione delle superfici mutevoli, sviluppando altresì un inquadramento critico del problema. Attraverso i contatti diretti con il mondo della produzione e della ricerca è stato fornito un aggiornamento delle tecnologie del vetro nei risvolti innovativi,  sperimentali e applicativi nel progetto architettonico, in un ambito in cui la letteratura scientifica non ha ancora registrato e codificato i segnali delle trasformazioni in atto, inquadrando le potenzialità e i punti ancora critici delle tecnologie in questione, delineando futuri scenari e possibilità di applicazione.
Quantum dynamics of a polar rotor acted upon by an electric rectangular pulse of variable duration
Creators: name: Karra, Mallikarjun
name: Schmidt, Burkhard
name: Friedrich, Bretislav
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Kicked rotors
subject: orientation and alignment
subject: quantum control
subject: 500 Naturwissenschaften und Mathematik::530 Physik::530 Physik

description: As demonstrated in our previous work [J. Chem. Phys. 149, 174109 (2018)], the kinetic energy imparted to a quantum rotor by a non-resonant electromagnetic pulse with a Gaussian temporal profile exhibits quasi-periodic drops as a function of the pulse duration. Herein, we show that this behaviour can be reproduced with a simple waveform, namely a rectangular electric pulse of variable duration, and examine, both numerically and analytically, its causes. Our analysis reveals that the drops result from the oscillating populations that make up the wavepacket created by the pulse and that they are necessarily accompanied by drops in the orientation and by a restoration of the pre-pulse alignment of the rotor. Handy analytic formulae are derived that allow to predict the pulse durations leading to diminished kinetic energy transfer and orientation. Experimental scenarios are discussed where the phenomenon could be utilised or be detrimental.
The role of elastic stresses on leaf venation morphogenesis
Creators: name: Laguna, M. F.
name: Bohn, S.
name: Jagla, E. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We explore the possible role of elastic mismatch between epidermis and mesophyll as a driving force for the development of leaf venation. The current prevalent 'canalization' hypothesis for the formation of veins claims that the transport of the hormone auxin out of the leaves triggers cell differentiation to form veins. Although there is evidence that auxin plays a fundamental role in vein formation, the simple canalization mechanism may not be enough to explain some features observed in the vascular system of leaves, in particular, the abundance of vein loops. We present a model based on the existence of mechanical instabilities that leads very naturally to hierarchical patterns with a large number of closed loops. When applied to the structure of high order veins, the numerical results show the same qualitative features as actual venation patterns and, furthermore, have the same statistical properties. We argue that the agreement between actual and simulated patterns provides strong evidence for the role of mechanical effects on venation development.
description: 10 figures, published in PLoS Computational Biology
GISDAY proceedings 29 08 2020.pdf
Creators: name: DENNOUNI, Nassim
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 401301
subject: Cartography and digital mapping
classificationCode: 401302
subject: Geospatial information systems and geospatial data modelling
classificationCode: 401303
subject: Navigation and position fixing

description: proceedings of GISDAY'2019
A good thing takes time: The role of preparation time in asynchronous video interviews
Creators: name: Basch, Johannes M.
name: Brenner, Falko
name: Melchers, Klaus G.
name: Krumm, Stefan
name: Dräger, Luise
name: Herzer, Helen
name: Schuwerk, Evelyn
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: applicant reactions
subject: asynchronous video interviews
subject: personnel selection
subject: selection interviews
subject: technology-mediated interviews
subject: 300 Sozialwissenschaften::330 Wirtschaft::330 Wirtschaft

description: Asynchronous video interviews (AVIs) are increasingly used to preselect applicants. Previous research found that interviewees in AVIs receive better interview ratings compared to other forms of interviews. It has been suggested that this difference could be due to the preparation time given for each AVI question. A pilot study confirmed that preparation time in AVIs is indeed beneficial for interview performance. Furthermore, our main study replicated the significant effect of preparation time on interview performance and revealed that it was mediated by active response preparation, whereas no mediation effects were found for strain and for the use of impression management. Finally, preparation time had no direct effect on fairness perceptions but a positive indirect effect via honest impression management.
Screening for depression and high utilization of health care resources among patients in primary care
Creators: name: Berghöfer, Anne
name: Roll, Stephanie
name: Bauer, Michael
name: Willich, Stefan N.
name: Pfennig, Andrea
Publisher: name: Charité - Universitätsmedizin Berlin
Year: 2021
Subjects: subject: primary care
subject: depression
subject: screening
subject: high utilizer
subject: B-PHQ
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::610 Medizin und Gesundheit

description: The study aims to evaluate the prevalence of depression and the severity of depressive symptoms among primary care patients, who are high utilizers (HU) of health care resources. A cross-sectional, two-stage design was applied to screen for depression using the Brief Psychiatric Health Questionnaire and the Diagnostic Expert System for Psychiatric Disorders. A total of 38 primary care physicians accredited to practice in Berlin and Potsdam in Germany participated in the study. A total of 1,775 patients participated, 507 were identified as HU, 182 (36%) of these were depressed compared to 81 (11%) of the typical utilizers (p < 0.001). The depression score was higher and acute suicidality was more prevalent in HU than in typical utilizers (p < 0.001). Our results suggest that HU represent a population with a high prevalence of depression in primary care and should be considered for routine depression screening.
Tau spin correlations and the anomalous magnetic moment
Creators: name: Bernabeu, J.
name: Gonzalez-Sprinberg, G. A.
name: Vidal, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that the precise determination of the Tau magnetic properties is possible in the next generation accelerators, specially at B/Flavour factories. We define spin correlation observables suitable to extract the real part of the magnetic form factor that, for the first time, will allow to test the standard model-QED predictions. In particular, the predicted QED-dependence with both the momentum transfer and the lepton mass can be precisely measured. Until now, the most stringent bounds on the $τ$ magnetic moment $a_τ$ come from LEP data with strong assumptions on the physics involved on the observed process. In this paper, we find three different combinations of spin correlations of the outgoing Taus that disentangle the magnetic moment form factor of the Tau lepton in the electromagnetic vertex. These combinations of asymmetries also get rid off the contributions coming from Z-mediating amplitudes to the defined correlations. Using unpolarized electron beams and an integrated luminosity of $15 \times 10^{18} b^{-1}$, the sensitivity to the $τ$ magnetic moment form factor is of the order $10^{-6}$. This sensitivity is two orders of magnitude better than the present existing high- or low-energy bounds on the magnetic moment and would allow its actual measurement with the precision of a few per cent.
description: 14 pages, 1 figure
Methylenecyclohexane annulations : total syntheses of axane-type sesquiterpenoids
Creators: name: Yeung, Bik Wah Anissa
Publisher: name: University of British Columbia
Year: 2010

description: This thesis describes the preparation of 5-chloro-2-trimethyl-stannyl-1-pentene (111) and its conversion into 5-chloro-2-lithio-1-pentene (112). The latter reagent, which reacts smoothly with cyclohex-anone at -78°C to give 5-chloro-2-(1-hydroxycyclohexyl)-1-pentene (132), was found to be thermally unstable at temperatures higher than -63°C. Reagent (112) was transformed into the Grignard reagent (144) and the organocopper-phosphine complex reagent (145). Conjugate addition of reagents (144) and/or (145) to cyclic enones under appropriate conditions followed by cyclization of the resultant products, effected useful methylenecyclohexane annulation sequences [(104) → (116)]. This methylenecyclohexane annulation method served as one of the two key steps in the syntheses of (±)-axamide-1 (174), (±)-axiso-nitrile-1 (173), and the corresponding C-10 epimers. Thus, copper(I)-catalyzed addition of the Grignard reagent (144) to 2-methyl-2-cyclo-penten-1-one (152), followed by cyclization of the resultant chloro ketone (159), gave the annulation product (170), which was converted into the enone (203). The other key step in the projected synthesis, which involved TiC1₄-catalyzed conjugate addition of the bis(trimethyl-silyl) ketene acetal (226) to the enone (203), provided a mixture of the keto acids (222) and (223). With appropriate functional group manipulations, (222) was converted into (±)-axamide-1 (174) and (±)-axisonitrile (173), while (223) was converted into (±)-10-epi-axamide-1 (224) and (±)-10-epi-axisonitrile-1 (225). [Formula Omitted]
Photon pumping in a weakly-driven quantum cavity-spin system
Creators: name: Psaroudaki, Christina
name: Refael, Gil
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the photon pumping effect in a topological model consisting of a periodically driven spin-1/2 coupled to a quantum cavity mode out of the adiabatic limit. In the strong-drive adiabatic limit, a quantized frequency conversion of photons is expected as the temporal analog of the Hall current. We numerically establish a novel photon pumping phenomenon in the experimentally accessible nonadiabatic driving regime for a broad region of the parameter space. The photon frequency conversion efficiency exhibits strong fluctuations and high efficiency that can reach up 80% of the quantized value for commensurate frequency combinations. We link the pumping properties to the delocalization of the corresponding Floquet states which display multifractal behavior as the result of hybridization between localized and delocalized sectors. Finally we demonstrate that the quantum coherence properties of the initial state are preserved during the frequency conversion process in both the strong and ultra-weak-drive limit.
description: 11 pages, 14 Figures, submitted to a special issue of Annals of Physics in honor of P. W. Anderson
A Social Mission is Not Enough: Reflecting the Normative Foundations of Social Entrepreneurship
Creators: name: Bruder, Ignas
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Normative critique of social entrepreneurship
subject: Integrative economic ethics
subject: Critique of economism
subject: Social enterprise
subject: Normativity
subject: Discourse ethics
subject: Typology
subject: 300 Sozialwissenschaften::330 Wirtschaft::330 Wirtschaft

description: Social entrepreneurship is not just an objective description of a phenomenon; it also carries a positive normative connotation. However, the academic discourse barely reflects social entrepreneurship's inherent normativity and often grounds it implicitly on the mission of a social enterprise. In this paper, we argue critically that it is insufficient to ground social entrepreneurship's inherent normativity on a social mission. Instead, we will show how such a mission-centric conception of social entrepreneurship, when put into practice, is prone to enhance rather than diminish societal grievances. In order to give social entrepreneurship an explicit and sound ethical grounding, we draw on integrative economic ethics as a frame of reference. From this perspective, social entrepreneurship necessitates adherence to the discourse-ethically reasoned moral principle in order to live up to its inherent normative validity claim of good entrepreneurship. The consideration of social entrepreneurship practices is crucial to make this approach less vulnerable to ethical critique. The addition of a practice dimension overcomes the mission-centric view of social entrepreneurship and opens up a typology of enterprise forms, thereby enabling a more fine-grained distinction between social enterprises and other forms of organization.
Transitivity of codimension one Anosov actions of R^k on closed manifolds
Creators: name: Barbot, Thierry
name: Maquera, Carlos
Publisher: name: arXiv
Year: 2008
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37C85

description: In this paper, we define codimension one Anosov actions of $\RR^k, k\geq 2,$ on a closed connected orientable manifold $M$. We prove that if the ambient manifold has dimension greater than $k+2$, then the action is topologically transitive. This generalizes a result of Verjovsky for codimension one Anosov flows.
description: Some ambiguity about the "codimension one' property has been removed
Maqui berry extract prevents cigarette smoke induced oxidative stress in human osteoblasts in vitro
Creators: name: Zhu, Sheng
name: Aspera-Werz, Romina H.
name: Chen, Tao
name: Weng, Weidong
name: Braun, Bianca
name: Histing, Tina
name: Nüssler, Andreas K.
Publisher: name: IfADo - Leibniz Research Centre for Working Environment and Human Factors, Dortmund
Year: 2021
Subjects: cigarette smoke
Maqui berry extract
human osteoblasts
oxidative stress
Nrf2

description: Oxidative stress which can be induced by cigarette smoke (CS) is associated with an altered osteoblast differentiation, and an inhibition of the mineralization process. Therefore, treatments focusing on reducing oxidative stress in osteoblasts could be a potential therapy supporting bone formation. Maqui berry extract (MBE) is the richest natural source of delphinidins with high antioxidant activity. In the present study, we pre-/ co-/ post-incubated MBE in cigarette smoke extract (CSE)-affected human osteoblasts (hOBs), to investigate the effects of MBE as an antioxidant on hOBs. Our results clearly showed that high concentrations of MBE are toxic for hOBs, while physiological concentrations of MBE have no negative effects in vitro. Physiological concentrations of MBE can reduce oxidative stress caused by CSE in hOBs by activating the antioxidative regulator Nrf2 and its regulated antioxidative enzymes. Moreover, the physiological concentration of MBE prevents the detrimental effects of CSE-induced oxidative damage on hOBs by increasing cell viability, differentiation capability and matrix mineralization. Pre-incubation with MBE showed a positive effect on the activation of the cellular antioxidant system in hOBs. Thus, we conclude that MBE at physiological concentrations can effectively protect osteoblasts from oxidative stress-induced damage by activating the cells’ antioxidative defense system.
description: EXCLI Journal; 20:Doc281; ISSN 1611-2156
Spin Waves in the Ferromagnetic Ground State of the Kagome Staircase System Co3V2O8
Creators: name: Ramazanoglu, M.
name: Adams, C. P.
name: Clancy, J. P.
name: Berlinsky, A. J.
name: Yamani, Z.
name: Szymczak, R.
name: Szymczak, H.
name: Fink-Finowicki, J.
name: Gaulin, B. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Inelastic neutron scattering measurements were performed on single crystal Co3V2O8 wherein magnetic cobalt ions reside on distinct spine and cross-tie sites within kagome staircase planes. This system displays a rich magnetic phase diagram which culminates in a ferromagnetic ground state below Tc~6 K. We have studied the low-lying magnetic excitations in this phase within the kagome plane. Despite the complexity of the system at higher temperatures, linear spin-wave theory describes most of the quantitative detail of the inelastic neutron measurements. Our results show two spin-wave branches, the higher energy of which displays finite spin-wave lifetimes well below Tc, and negligible magnetic exchange coupling between Co moments on the spine sites.
description: 4 pages and 4 figures