cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Synthese von (+-)-14-Hydoxy-2,3,6-trimethoxy-9,11,12,13,13a,14-hexahydro-dibenzo[f,h]pyrrolo[1,2-b]isochinolin
Creators: name: Poettinger, T.
name: Wiegrebe, Wolfgang
Publisher: name: Universität Regensburg
Year: 1981
Subjects: subject: 540 Chemie

description: Die Konstitution des von Faberl)l6) aus Cynanchum vincetoxicum isolierten 14-Hydroxy-Alkaloids A (1) wird durch Synthese der diastereomeren Racemate 16 bewiesen. Es entsteht dabei überwiegend ein dem Racemat des natürlichen Alkaloids entsprechendes Produkt, das als O-Acetylverbindung (±) 17a isoliert wird. The Constitution of the 14-hydroxy alkaloid A (1), isolated by Faber from cynanchum vincetoxicum, is proved by synthesis of the diastereomeric racemates 16. The main product corresponds with the natural alkaloid and is isolated as its O-acetyl derivative (±)-17a.
Gaschromatographische Ameisensäurebestimmung in wäßrigen Lösungen
Creators: name: Vilbig, M.
name: Eibler, E.
name: Wiegrebe, Wolfgang
Publisher: name: Universität Regensburg
Year: 1980
Subjects: subject: 540 Chemie

description: Ameisensäure kann neben Essigsäure in wäßrigen Lösungen als n-Propylformiat gc in einer Grenzkonzentration von 2,4 ppm [w/v] bei einer Standardabweichung von 3,8% auf PAeG 4000/Chromosorb G bestimmt werden. Große Mengen anorganischer Ionen (S04 2-, S03 2-, J-) stören nicht.
Densitometrische Bestimmung einiger Aminoglykosid- und Peptid- Antibiotika
Creators: name: Breitinger, M.
name: Paulus, H.
name: Wiegrebe, Wolfgang
Publisher: name: Universität Regensburg
Year: 1980
Subjects: subject: 540 Chemie

description: Die quantitative Trennung der drei Antibiotika Bacitracin, Polymyxin, Neomycinsulf at und der Gentamicin-Bestandteile mit anschließender selektiver Fluoreszenzmessung nach Derivatisierung mit Fluram eröffnet eine densitometrische Bestimmungsmethode für Antibiotika, die eine basische NH2-Gruppe besitzen. Zersetzungsprodukte mit NH2-Gruppen lassen sich auf diese Weise sehr empfindlich nachweisen und bestimmen.
A stochastic approximation approach to quasi-stationary distributions on finite spaces
Creators: name: Benaïm, Michel
name: Cloez, Bertrand
Publisher: name: arXiv
Year: 2014
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: This work is concerned with the analysis of a stochastic approximation algorithm for the simulation of quasi-stationary distributions on finite state spaces. This is a generalization of a method introduced by Aldous, Flannery and Palacios. It is shown that the asymptotic behavior of the empirical occupation measure of this process is precisely related to the asymptotic behavior of some deterministic dynamical system induced by a vector field on the unit simplex. This approach provides new proof of convergence as well as precise rates for this type of algorithm. We then compare this algorithm with particle system algorithms.
Così oscilla 19P, la cometa “coscia di pollo”
Creators: Redazione Media Inaf
Publisher: name: Media Inaf
Year: 2023

Un team formato da ricercatori dell’Inaf di Padova, dell’Università di Padova e da astronomi non professionisti esperti in campo cometario è riuscito a misurare lo spostamento dell’asse di rotazione della cometa visitata, nel 2001, dalla sonda Deep Space 1: dall’ultimo passaggio vicino alla Terra, si è inclinato di circa 8 gradi, rafforzando così l’ipotesi che a causarlo sia un lento movimento precessionale. I risultati sono pubblicati su Icarus
Da Atacama a Marte in cerca di vita
Creators: Ufficio stampa Inaf
Publisher: name: Media Inaf
Year: 2023

Un gruppo di astrobiologi, tra cui alcuni dell’Inaf, ha studiato uno dei luoghi più aridi del nostro pianeta – Piedra Roja, in Cile – par valutare la difficoltà della ricerca di tracce di vita su Marte. Da quanto è emerso, l’impresa sarà più ardua del previsto: gli attuali strumenti di rilevamento di tracce biologiche già presenti sulla superficie di Marte, o in fase di progettazione, potrebbero non essere abbastanza sensibili per mettere in evidenza tracce di vita estinta
Euclid, lancio in calendario per l’estate
Creators: Redazione Ansa
Publisher: name: Media Inaf
Year: 2023

Conclusi con successo anche i test di compatibilità elettromagnetica, il cacciatore del lato oscuro dell'universo presto lascerà la facility di Thales Alenia Space a Cannes, in Francia, per raggiungere Savona, dove a metà aprile dovrebbe imbarcarsi per Cape Canaveral, ultima tappa prima del lancio – previsto a partire dal mese di luglio – verso L2, a un milione e mezzo di km dalla Terra
DEVELOPMENT OF PHYSICAL FITNESS OF BASKETBALL PLAYERS IN THE INITIAL TRAINING GROUP
Creators: name: Paluaniyazova Naubahar  Amaniyazov Sypatdin
Publisher: name: Zenodo
Year: 2023

description: This article explores the crucial aspects of physical fitness development in basketball players within the initial training group. Physical fitness plays a pivotal role in enhancing performance, preventing injuries, and promoting long-term athlete development. The study delves into the specific training methodologies, drills, and strategies employed to improve the physical fitness of novice basketball players. By assessing the development of key fitness components such as cardiovascular endurance, strength, agility, and coordination, this research provides valuable insights into optimizing training programs for early-stage basketball athletes. The findings highlight the importance of tailored training regimens and the potential benefits for the overall skill acquisition of basketball players.
Throughput Optimization for Massive MIMO Systems Powered by Wireless Energy Transfer
Creators: name: Yang, Gang
name: Ho, Chin Keong
name: Zhang, Rui
name: Guan, Yong Liang
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This paper studies a wireless-energy-transfer (WET) enabled massive multiple-input-multiple-output (MIMO) system (MM) consisting of a hybrid data-and-energy access point (H-AP) and multiple single-antenna users. In the WET-MM system, the H-AP is equipped with a large number $M$ of antennas and functions like a conventional AP in receiving data from users, but additionally supplies wireless power to the users. We consider frame-based transmissions. Each frame is divided into three phases: the uplink channel estimation (CE) phase, the downlink WET phase, as well as the uplink wireless information transmission (WIT) phase. Firstly, users use a fraction of the previously harvested energy to send pilots, while the H-AP estimates the uplink channels and obtains the downlink channels by exploiting channel reciprocity. Next, the H-AP utilizes the channel estimates just obtained to transfer wireless energy to all users in the downlink via energy beamforming. Finally, the users use a portion of the harvested energy to send data to the H-AP simultaneously in the uplink (reserving some harvested energy for sending pilots in the next frame). To optimize the throughput and ensure rate fairness, we consider the problem of maximizing the minimum rate among all users. In the large-$M$ regime, we obtain the asymptotically optimal solutions and some interesting insights for the optimal design of WET-MM system. We define a metric, namely, the massive MIMO degree-of-rate-gain (MM-DoRG), as the asymptotic UL rate normalized by $\log(M)$. We show that the proposed WET-MM system is optimal in terms of MM-DoRG, i.e., it achieves the same MM-DoRG as the case with ideal CE.
description: 15 double-column pages, 6 figures, 1 table, to appear in IEEE JSAC in February 2015, special issue on wireless communications powered by energy harvesting and wireless energy transfer
L’impossibile sfericità della kilonova
Creators: Maura Sandri
Publisher: name: Media Inaf
Year: 2023

Quando le stelle di neutroni si scontrano producono un'esplosione che, contrariamente a quanto si credeva fino a poco tempo fa, sembra presentare una forma perfettamente sferica. Anche se il motivo di tale simmetria è ancora un mistero, la scoperta degli astrofisici dell'Università di Copenaghen potrebbe fornire nuovi indizi di fisica fondamentale e un nuovo modo di misurare l'età dell'universo
Solar Orbiter cattura il transito di Mercurio
Creators: Federico Di Giacomo
Publisher: name: Media Inaf
Year: 2023

Lo scorso 3 gennaio il satellite dell’Agenzia spaziale europea e della Nasa Solar Obiter, volto a studiare le caratteristiche della nostra stella, ha osservato il transito di Mercurio sul disco del Sole. Tale osservazione rappresenta una grande opportunità per migliorare ulteriormente la qualità dei dati ottenuti dagli strumenti a bordo del satellite europeo
L’asteroide che non fa più paura
Creators: Laura Leonardi
Publisher: name: Media Inaf
Year: 2023

Lo scorso 3 febbraio un asteroide lungo circa 500 metri ha sorvolato il nostro pianeta alla distanza di circa 1,8 milioni di chilometri. Il Goldstone Deep Space Network della Nasa ha colto l’occasione per studiarlo “da vicino”, riuscendo non solo a determinarne molte caratteristiche ma anche a stabilire che la sua orbita non pone alcun rischio d’impatto con la Terra
Ecco perché quella di Matera è una meteorite
Creators: Valentina Guglielmo
Publisher: name: Media Inaf
Year: 2023

A Matera ci sono i sassi, d’accordo, ma quella caduta dal cielo il giorno di San Valentino è una meteorite. Come lo sappiamo? E a quali ulteriori analisi saranno sottoposti i frammenti recuperati venerdì scorso? Per i più scettici e i più curiosi, abbiamo fatto qualche domanda ad Albino Carbognani, astronomo dell’Inaf esperto di corpi minori, osservazioni di comete e asteroidi. Qui sotto le risposte
The Medical School During War
Creators: name: Sims, Ronald H
Publisher: name: Galter Health Science Library & Learning Center
Year: 2019

description: Story slides (photos and text) prepared by Galter Health Sciences Library for the exhibit, "The Medical School During War", that was first mounted in 2013, and  displayed in the connecting corridor of Feinberg School of Medicine's Ward-Morton buildings. (The corridor in 2018 was renamed the George M. Eisenberg Gallery.) The exhibit also featured artifacts (eg. military uniform, plaque) not depicted here.
THE EFFECT OF REMITTANCES ON HOUSEHOLD EXPENDITURES AND LABOR SUPPLY IN ETHIOPIA: EVIDENCE FROM ETHIOPIAN RURAL HOUSEHOLD SURVEY
Creators: name: GENET EJETA ABOMSA
Publisher: name: Zenodo
Year: 2014

description: The study examined the impacts of remittances on household expenditures and labor supply in rural households in Ethiopia. Specifically, the paper investigates the extents to which receipts of remittances affect the consumption and investment behaviors of rural households. The study employs two-part model (Hurdle model analyses in order to estimate the impact of household expenditure within Engle"s Curve framework .The result indicates that there is no strong link between receipt of remittances and productive investment expenditures. The study finds that households receiving remittances spend, on average ceteris paribus, a larger share of their budget on consumption of food and a smaller share on than do households receiving no remittances. This implies that migration and remittances are used as a short term coping strategies and hardly used as stepping-stone to productive investment options. Therefore, designing policies that increase the inflow and usage of remittances are vital. Policies include: improving the operation and service of financial institutions, providing incentives and training for remittance recipients to be designed.
Tritium- und 14C-markiertes Dithranol-1,8,9-triacetat
Creators: name: Faro, H.-P.
name: Retzow, A.
name: Wiegrebe, Wolfgang
Publisher: name: Universität Regensburg
Year: 1980
Subjects: subject: 540 Chemie

description: Dithranol (1) wird mit [l-14C]-Acetanhydrid zu l,8,9-[14C]-Triacetoxyanthracen (2) umgesetzt. l,8,9-Triacetoxy[3H]-anthracen entsteht aus l,8-Dihydroxy-[3H]-9,10-anthrachinon (6) durch Reduktion und Acetylierung. Dithranol (1) is converted to l,8,9-[14C]-triacetoxyanthracene (2) by treatment with [l-14C]-acetic anhydride. l,8,9-Triacetoxy-[3H]-anthracene is produced by reduction of [3H]-l,8-dihydroxy— 9,10-anthraquinone (6) followed by acetylation.
Bose-Einstein Condensates with Derivative and Long-Range Interactions as Set-Ups for Analog Black Holes
Creators: name: Kuhnel, Florian
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Other Condensed Matter (cond-mat.other)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: General types of Bose-Einstein condensates are considered. The formation of black-hole analogues is examined for both short- and long-range interactions for arbitrary spatial dimensions greater than two. The former case includes non-linear derivative terms plus an inevitable external potential, while the latter one consists solely of gravity-like self-interactions for which intrinsic formation of analogue Schwarzschild-type background space-times is possible. The corresponding geometries are studied, and it is shown how they can be made stable. Their Hawking temperature is estimated, and it is found that in certain set-ups it can be significantly increased, thus providing better detectability.
description: 8 pages; 4 figures; v2: changes to match published version
Asyndetus Loew
Creators: name: Wang, Mengqing
name: Yang, Ding
Publisher: name: Zenodo
Year: 2005
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Dolichopodidae
Asyndetus

description: Genus Asyndetus Loew
 Asyndetus Loew, 1869: 35. Type species: Diaphorus interruptus Loew, 1861, des. Bigot (1890: 278).
Diagnosis. Small to medium­sized (body length 1.5–4.5 mm). Eyes in both sexes broadly separated. Generally 5–6 strong dc, although sometimes only 4. Pulvilli sometimes enlarged in males. Wing: costa ending at R4+5, just before wing apex; vein M usually with bend or weakening in distal third of wing; crossvein m­cu usually present, positioned basally and making CuAx ratio small, less than 0.25. Male sternum 8 usually with 4 strong curved setae that projected backward.
description: Published as part of Wang, Mengqing & Yang, Ding, 2005, Xinjiang, with a key to Central Asian species, pp. 1-8 in Zootaxa 892 on page 2, DOI: 10.5281/zenodo.170933
Zhurong rileva un complesso sottosuolo marziano
Creators: Maura Sandri
Publisher: name: Media Inaf
Year: 2023

Nei primi cinque metri del sottosuolo marziano, il radar del rover Zhurong della missione cinese Tianwen-1 ha rilevato crateri da impatto poco profondi, sepolti da depositi di sedimenti, e altre strutture geologiche. Nessuna traccia di acqua o ghiaccio. Le immagini prodotte sono state presentate in un articolo pubblicato sulla rivista Geology
title: Netherlands Report. Sustainable Governance Indicators 2022
Creators: name: Hoppe, Robert
name: Jeliazkova, Margarita I.
name: Krouwel, André
name: Bandelow, Nils C.
Publisher: name: Bertelsmann Stiftung
Year: 2022
Subjects: Governance
Democracy
Regierungshandeln
Demokratie

description: The years 2020-2021 were the last of the Rutte III government that came to power in March 2017. This was an uneasy four-party coalition between centerright parties (the conservative-liberal People’s Party for Freedom and Democracy (VVD) and the largely ideology-free Christian Democratic Appeal (CDA)) and center-left parties (pragmatist social liberals Democrats 66 (D66) and the left-leaning Christian fundamentalist Christian Union (CU) with their near-immovable principles on health ethics).
Untersuchungen zum Stoffwechsel antipsoriatisch wirksamer Anthron-Derivate
Creators: name: Wiegrebe, Wolfgang
name: Gerber, A.
name: Kappler, J.
name: Bayerl, C.
Publisher: name: Universität Regensburg
Year: 1979
Subjects: subject: 540 Chemie

description: Zusammenfassung: Der Metabolismus der antipsoriatisch wirksamen Verbindungen 1,8,9-Triacetoxyanthracen und 1,8-Diacetoxy-9-anthron wird untersucht. Es bilden sich 1,8- Dihydroxy - 9 - anthron, 1 - Hydroxy - 8 - acetoxy-9-anthron, 1,8,1 ',8'- Teträhydroxy-bianthron, 1,8-Dihydroxy-anthrachinon, 1,8-Diacetoxy-anthrachinon und 1-Hydroxy-8-acetoxy- anthrachinon. Quantitative Bestimmungen dieser „Metaboliten" zeigen, daß die hydrolytischen Reaktionen vor den Oxidationen stattfinden. Im Gegensatz zu 1,8-Dihydroxy-9- anthron lassen 1,8,9-Triacetoxyanthracen und 1,8-Diacetoxy- 9-anthron psoriatische Läsionen verschwinden, ohne Entzündungen hervorzurufen. Die Unwirksamkeit des 1,8,9- Trimethoxyanthracens spricht ebenfalls dafür, daß es sich zumindest beim 1,8,9-Triacetoxy-anthracen um eine Verbindung mit „prodrug"-Charakter handelt. — Die hier beschriebenen 10,10-dialky Herten 1,8- Dihydroxy -9- anthrone sind in Übereinstimmung mit der Krebs'sehen Hypothese unwirksam bei Psoriasis. Summary: Studies on the Metabolism of Antipsoriatic Anthrone-Derivatives The metabolisatiön of the antipsomatically active molecules 1,8,9-triacetoxy-anthracene und 1,8-diacetoxy-9-anthrone by serum is described. Under these conditions 1,8-dihydroxy - 9-anthrone, l-hydroxy-8-acetoxy-9-anthrone, 1,8 ,V ,8'-tetrahydroxy- bisanthrone, 1,8-dihydroxy-anthraquinone, 1,8-diacetoxy- anthraquinone and 1-hydroxy-8-acetoxy-anthraquinone arise from both educts. Quantitative determinations of these metabolites indicate that hydrolytic reactions occur prior to oxidation. Contrary to l,8-dihydroxy-9- anthrone, 1,8,9-triacetoxyanthracene and 1,8-diacetoxy-9- anthrone are effective against psoriatic lesions without accompanying inflammations of the skin. 1,8,9-Trimethoxyanthracene, however, is ineffective, also indicating that at least 1,8,9-triacetoxy-anthracene is a prodrug. — In agreement with Krebs' hypothesis 10,10-dialky lated 1,8-dihydroxy- 9-anthrones described in this paper are ineffective against psoriasis.
Stereoselektive Synthese des R-(+)-3-Phenyl-isochromans
Creators: name: Angerer, E. von
name: Wiegrebe, Wolfgang
Publisher: name: Universität Regensburg
Year: 1979
Subjects: subject: 540 Chemie

description: Die Synthese der Titelverbindung R-(+)-7 geht von L-(+)-Mandelsäure aus, die mit o-Brombenzylbromid zu 4 verethert wird. Ringschluß mit n-Butyllithium führt zum Phenylisochromanon 5, das entspr. Carbinol-acetat 6c wird zu 7 hydrogenolytisch gespalten. A stereoselective synthesis of (/?)-(+)-3-phenylisochromane (7) from L-(+)-mandelic acid is described. Condensation with o-bromobenzyl bromide leads to 4, ring closure with n-butyllithium produces the phenylisochromanone 5, hydrogenolytic fission of the corresponding carbinol acetate 6c gives the desired compound 7.
Coherent medium-induced gluon radiation in hard forward $1\to 1$ partonic processes
Creators: name: Peigné, Stéphane
name: Arleo, François
name: Kolevatov, Rodion
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We revisit the medium-induced coherent radiation associated to hard and forward (small angle) scattering of an energetic parton through a nuclear medium. We consider all $1\to 1$ hard forward processes ($g \to g$, $q \to q$, $q \to g$ and $g \to q$), and derive the energy spectrum of induced coherent radiation rigorously to all orders in the opacity expansion and for the specific case of a Coulomb scattering potential. We obtain a simple general formula for the induced coherent spectrum, which encompasses the results corresponding to previously known special cases.
description: 35 pages, 10 figures; title changed, introduction developed and references added, detailed discussion added in Section VI, all results unchanged; version v2 corresponds to the published version
Dark Energy in Scalar-Tensor Theories.
Creators: name: Möller, J.
name: DESY
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2007
Subjects: Unveröffentlichte Hochschulschrift

description: Universität Hamburg, Diplomarbeit, 2007; Universität Hamburg, Diplomarbeit, 2007
Family of nonstandard integrable and superintegrable classical Hamiltonian systems in non-vanishing magnetic fields
Creators: name: Hoque, Md Fazlul
name: Šnobl, Libor
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this paper we present the construction of all nonstandard integrable systems in magnetic fields whose integrals have leading order structure corresponding to the case (i) of Theorem 1 in [A Marchesiello and L Šnobl 2022 {\it J. Phys. A: Math. Theor.} {\bf 55} 145203]. We find that the resulting systems can be written as one family with several parameters. For certain limits of these parameters the system belongs to intersections with already known standard systems separating in Cartesian and / or cylindrical coordinates and the number of independent integrals of motion increases, thus the system becomes minimally superintegrable. These results generalize the particular example presented in section 3 of [A Marchesiello and L Šnobl 2022 {\it J. Phys. A: Math. Theor.} {\bf 55} 145203].
description: 18 pages
Nucleon Properties at Finite Temperature in the Extended Quark-Sigma Model
Creators: name: Abu-Shady, M.
name: Abu-Nab, A. K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Hadron properties are studied at hot medium using the quark sigma model. The quark sigma model is extended to include eighth-order of mesonic interactions based on some aspects of quantum chromodynamic (QCD) theory. The extended effective potential tends to the original effective potential when the coupling between the higher order mesonic interactions equal to zero. The field equations have been solved in the mean-field approximation by using the extended iteration method. We found that the nucleon mass increases with increasing temperature and the magnetic moments of proton and neutron increase with increasing temperature. A comparison is presented with recent previous works and other models. We conclude that higher-order mesonic interactions play an important role in changing the behavior of nucleon properties at finite temperature. In addition, the deconfinement phase transition is satisfied in the present model.
description: 6 pages, 6 figures The misprints are corrected in the last published version
Asyndetus Loew
Creators: name: Wang, Mengqing
name: Yang, Ding
Publisher: name: Zenodo
Year: 2005
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Dolichopodidae
Asyndetus

description: Key to species (males) of Asyndetus Loew from Central Asia
1. Abdominal sternum 5 with many long black bristles; cercus with 2 long apical bristles....................................................................................................................................... 2
­ Abdominal sternum 5 without long black bristles; cercus without long apical bristle 3
 2. Fore tibia longer than fore tarsus; fore and mid tibiae yellow; mid femur with 2 rows of v. China (Xinjiang) ....................................................... Asyndetus wusuensis sp. nov.
 ­ Fore tibia shorter than fore tarsus; fore and mid tibiae metallic green with yellow apex; mid femur just have one row of av. Tajikistan ........ Asyndetus barbiventris Stackelberg
3. First flagellomere about 2.0 times longer than wide..................................................... 4
­ First flagellomere as long as wide or wider than long.................................................. 5
 4. Legs chiefly yellow; hind femur with 2 ad and 4–6 pd. Mongolia................................. ..................................................................................... Asyndetus longicornis Negrobov
 ­ Legs chiefly dark brown; hind femur without distinct d. China (Xinjiang).................... ..................................................................................... Asyndetus xinjiangensis sp. nov.
5. Acr present; fore tibia with ad; hind femur with long v; mid tarsus without claw(s)... 6
 ­ Acr absent; fore tibia without distinct ad; hind femur without distinct v; mid tarsus with claws. Mongolia ............................................................. Asyndetus izius Negrobov
6. First flagellomere with acute apex; fore and mid femora each with 2 rows of v; hind
 femur with 2 rows of long v on whole length. China (Xinjiang) .. Asyndetus lii sp. nov. ­ First flagellomere with obtuse apex; fore and mid femora each without distinct v; hind femur just with long v on apical half. Mongolia, Turkestan & Uzbekistan.................... ............................................................................................. Asyndetus albipalpus Loew
description: Published as part of Wang, Mengqing & Yang, Ding, 2005, Xinjiang, with a key to Central Asian species, pp. 1-8 in Zootaxa 892 on pages 2-3, DOI: 10.5281/zenodo.170933
Zur Reaktion von tert-Butyl-phosphaalkin mit Molybdänkomplexen
Creators: name: Scheer, Manfred
name: Krug, Joachim
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: Phosphaalkyne; Molybdenum Complexes; X-ray Structure Determination; 1,3-Diphosphabutadienyl Ligands; 1,2,4-Triphosphacyclobutadienyl Ligand; 1,2,4-Triphospholyl Ligand; 3,4-Diphosphacyclopentadienone Ligand
subject: 540 Chemie

description: Die Umsetzung von tBuCP mit [(CH3CN)3Mo(CO)3] führt zum Zweikernkomplex [Mo(CO)4Mo(CO)2(4-P3CtBu){4-P2(CtBu)2}] 1 sowie den Carbinkomplexen [Mo(CO)4{P3(CtBu)2}{Mo(CO)2(CtBu)}{3-P2(CtBu)2}] 2 und [Mo(CtBu){4-P2(CtBu)2(CO)}{5-P3(CtBu)2}] 3 als isolierte Produkte. Alle Verbindungen wurden durch die Kristallstrukturanalyse, mittels NMR- und IR-Spektroskopie sowie massenspektrometrisch strukturell charakterisiert. Der Zweikernkomplex 1 hat einen 1,3-Diphosphacyclobutadienylring und einen 1,2,4-Triphosphacyclobutadienylligand. In 2 sind ein 1,3-Diphosphacyclobutadienylring und ein -gebundener 1,2,4-Triphospholylligand an zwei Mo-Komplexzentren gebunden. Das Charakteristikum von 3 ist neben einem -gebundenen 1,2,4-Triphospholyl- ein 3,4-Diphosphacyclopentadienon-Ligand, der sich durch CO-Einschub während der Cyclodimerisierung zweier Phosphaalkine gebildet haben sollte.
Unirational threefolds with no universal codimension 2 cycle
Creators: name: Voisin, Claire
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: We prove that the general quartic double solid with $k\leq 7$ nodes does not admit a Chow theoretic decomposition of the diagonal, or equivalently has a nontrivial universal ${\rm CH}_0$ group. The same holds if we replace in this statement "Chow theoretic" by "cohomological". In particular, it is not stably rational. We also prove that the general quartic double solid with seven nodes does not admit a universal codimension 2 cycle parameterized by its intermediate Jacobian, and even does not admit a parametrization with rationally connected fibres of its Jacobian by a family of 1-cycles. This implies that its third unramified cohomology group is not universally trivial.
description: Final version to appear in Invent. Math
Recuperata la meteorite di San Valentino
Creators: Albino Carbognani
Publisher: name: Media Inaf
Year: 2023

La sera del 14 febbraio 2023 verso le ore 19 tre camere della rete Prisma hanno rilevato un brillante bolide fra Puglia e Basilicata. Dopo calcoli frenetici fatti dal team di Prisma, c'era un'elevata probabilità di ritrovare meteoriti a nord di Matera e sono iniziate subito le ricerche. Ieri il ritrovamento di una meteorite associata all'evento, la seconda mai recuperata in Italia grazie all'analisi della traiettoria. Ecco la storia di questo nuovo ed eccitante ritrovamento tutto italiano
Urban Cultural Heritage in Delhi, India
Creators: name: Trumpp, Tine
name: Kraas, Frauke
Publisher: name: Asien
Year: 2022

description: The attractiveness of cities and their national and international competitiveness are partly determined by “soft” and “intangible" factors: cultural, social, and individual aspects are becoming the basis for the “unique competitive edge” that cities have and play a crucial role with regard to the creation of identity. In Delhi, every epoch of the city’s rich history has left its traces, and the Indian capital has numerous monuments, gardens, historic areas, and ancient buildings as a result. Affected by globalization and urbanization, Delhi has been increasingly turning into a globalized metropolis, which has had a major impact on its urban fabric. Framed against the backdrop of the changing concepts and perception of urban heritage, this article focuses on the question of how Delhi’s unique urban heritage should be safeguarded. The responsibility for this task does not lie with the authorities alone, but is embedded in the complex structure of public, private, individual, and collective stakeholders acting at different levels with their respective interests. These diverse stakeholders act within the scope of a differentiated set of rules and legislation. Thus, safeguarding urban heritage and integrating it into the urban planning process requires laws and regulations specifically relevant to cultural heritage and not just planning instruments. The institutional and legal framework of heritage protection in Delhi, its implementation, and the complex challenges that go with this are investigated.
description: Asien, Nr. 134 (2015): ASIEN (Januar)
Individuate quattro classi di sistemi planetari
Creators: Maura Sandri
Publisher: name: Media Inaf
Year: 2023

Da tempo gli astronomi sanno che i sistemi planetari non sono tutti necessariamente strutturati come il Sistema solare. Alcuni ricercatori delle Università di Berna e Ginevra, e del National Center of Competence in Research PlanetS, hanno ora dimostrato per la prima volta che effettivamente esistono quattro classi di sistemi planetari e che il Sistema solare appartiene a quella più rara
Spin-transfer torque switching at ultra low current densities
Creators: name: Leutenantsmeyer, Johannes Christian
name: Zbarsky, Vladyslav
name: Wittrock, Steffen
name: Walter, Marvin
name: Peretzki, Patrick
name: Schuhmann, Henning
name: Thomas, Andy
name: Rott, Karsten
name: Reiss, Guenter
name: Kim, Tae Hee
name: Seibt, Michael
name: Muenzenberg, Markus
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The influence of the tantalum buffer layer on the magnetic anisotropy of perpendicular Co-Fe-B/MgO based magnetic tunnel junctions is studied using magneto-optical Kerr-spectroscopy. Samples without a tantalum buffer are found to exhibit no perpendicular magnetization. The transport of Boron into the tantalum buffer is considered to play an important role on the switching currents of those devices. With the optimized layer stack of a perpendicular tunnel junction, a minimal critical switching current density of only 9.2 kA/cm$^2$ is observed. As of today, this value is the lowest reported value for current-induced magnetization reversal.
Commensurate antiferromagnetic excitations as a signature of the pseudogap in the tetragonal high-Tc cuprate HgBa$_2$CuO$_{4+δ}$
Creators: name: Chan, M. K.
name: Dorow, C. J.
name: Mangin-Thro, L.
name: Tang, Y.
name: Ge, Y.
name: Veit, M. J.
name: Yu, G.
name: Zhao, X.
name: Christianson, A. D.
name: Park, J. T.
name: Sidis, Y.
name: Steffens, P.
name: Abernathy, D. L.
name: Bourges, P.
name: Greven, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Antiferromagnetic correlations have been argued to be the cause of the d-wave superconductivity and the pseudogap phenomena exhibited by the cuprates. Although the antiferromagnetic response in the pseudogap state has been reported for a number of compounds, there exists no information for structurally simple HgBa$_2$CuO$_{4+δ}$. Here we report neutron scattering results for HgBa$_2$CuO$_{4+δ}$ (superconducting transition temperature T$_c$ $\sim$ 71 K, pseudogap temperature T* $\sim$ 305 K) that demonstrate the absence of the two most prominent features of the magnetic excitation spectrum of the cuprates: the X-shaped 'hourglass' response and the resonance mode in the superconducting state. Instead, the response is Y-shaped, gapped, and significantly enhanced below T*, and hence a prominent signature of the pseudogap state.
On a semitopological semigroup $\boldsymbol{B}_ω^{\mathscr{F}}$ when a family $\mathscr{F}$ consists of inductive non-empty subsets of $ω$
Creators: name: Gutik, Oleg
name: Mykhalenych, Mykola
Publisher: name: arXiv
Year: 2022
Subjects: subject: Group Theory (math.GR)
subject: General Topology (math.GN)
subject: FOS: Mathematics
subject: Primary 22A15, 20A15, Secondary 54D10, 54D30, 54H12

description: Let $\boldsymbol{B}_ω^{\mathscr{F}}$ be the bicyclic semigroup extension for the family $\mathscr{F}$ of $ω$-closed subsets of $ω$ which is introduced in \cite{Gutik-Mykhalenych=2020}. We study topologizations of the semigroup $\boldsymbol{B}_ω^{\mathscr{F}}$ for the family $\mathscr{F}$ of inductive $ω$-closed subsets of $ω$. We generalize Eberhart-Selden and Bertman-West results about topologizations of the bicyclic semigroup \cite{Bertman-West-1976, Eberhart-Selden=1969} and show that every Hausdorff shift-continuous topology on the semigroup $\boldsymbol{B}_ω^{\mathscr{F}}$ is discrete and if a Hausdorff semitopological semigroup $S$ contains $\boldsymbol{B}_ω^{\mathscr{F}}$ as a proper dense subsemigroup then $S\setminus\boldsymbol{B}_ω^{\mathscr{F}}$ is an ideal of $S$. Also, we prove the following dichotomy: every Hausdorff locally compact shift-continuous topology on $\boldsymbol{B}_ω^{\mathscr{F}}$ with an adjoined zero is either compact or discrete. As a consequence of the last result we obtain that every Hausdorff locally compact semigroup topology on $\boldsymbol{B}_ω^{\mathscr{F}}$ with an adjoined zero is discrete and every Hausdorff locally compact shift-continuous topology on the semigroup $\boldsymbol{B}_ω^{\mathscr{F}}\sqcup I$ with an adjoined compact ideal $I$ is either compact or the ideal $I$ is open, which extent many results about locally compact topologizations of some classes of semigroups onto extensions of the semigroup $\boldsymbol{B}_ω^{\mathscr{F}}$.
description: 8 pages. arXiv admin note: substantial text overlap with arXiv:2112.15000
Se nei buchi neri c’è l’energia del vuoto
Creators: Marco Malaspina
Publisher: name: Media Inaf
Year: 2023

Una serie d’osservazioni su galassie ellittiche raccolte da un team guidato dall’Università delle Hawaii suggerisce l’esistenza di un collegamento fra buchi neri ed energia oscura. Anzi: se lo scenario proposto dagli autori dello studio – basato su un fenomeno detto “coupling cosmologico” – si rivelasse corretto, i buchi neri “sarebbero” l’energia oscura
Come un girino attorno a un buco nero
Creators: Valentina Guglielmo
Publisher: name: Media Inaf
Year: 2023

La forma curva a "girino" della nube di gas molecolare Tadpole vicino al centro della Via Lattea, a 27mila anni luce da noi, suggerisce che essa si stia allungando mentre orbita attorno a un oggetto massiccio e compatto, ma soprattutto invisibile. Un buco nero di massa intermedia, secondo gli autori dello studio
Improving performance of infrastructure projects in developing countries: an Ecuadorian case study
Creators: name: McDermot, Eamon
name: Agdas, Duzgun
name: Díaz, Carlos R. Rodríguez
name: Rose, Timothy
name: Forcael, Eric
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Space Science
subject: Medicine
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Developmental Biology
subject: Science Policy

description: Improving the quality of infrastructure is crucial for sustainable development. Providing infrastructure faces many challenges – both financially and in terms of how projects are delivered. This is particularly apparent for developing countries. This research aims to (a) determine the key factors influencing the successful delivery of infrastructure projects, (b) provide an example of these factors as manifested on an important Ecuadorian flood control and irrigation infrastructure project and (c) identify key learnings for future projects in similar contexts. Many of the key failure factors identified in the literature were evident on the example project, validating the literature findings and indicating that the learnings may be relevant to the context of developing countries more widely. These factors included insufficient planning, unrealistic estimates, poor stakeholder communication, bureaucracy, insufficient ground investigation and an inadequate project delivery system. Addressing these issues is an important step towards improving infrastructure delivery in developing countries.
Transition Metal Induced Pentamerization of a Phosphaalkyne [Übergangsmetallinduzierte Pentamerisierung eines Phosphaalkins]
Creators: name: Kramkowski, Peter
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: Carbonyl complexes; Phosphaalkynes; Tungsten
subject: 540 Chemie

description: The metalla-norbornadiene complex 1, extended by two phosphaalkyne units in the 1,4-position, is formed by an unprecedented pentamerization of the phosphaalkyne MesCP (Mes=2,4,6-Me3C6H2) in the coordination sphere of the transition metal complex [W(CO)5(thf)].
Untersuchungen zur Sb-Sb-Bindungsknüpfung in der Koordinationssphäre von Übergangsmetallen
Creators: name: Vogel, Ulf
name: Baumann, Gerhard
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: Antimony; Coordination compounds; Cluster compounds; Crystal structure
subject: 540 Chemie

description: Das Reaktionsverhalten von SbCl3 gegenüber verschiedenen Übergangsmetallcarbonylmetallaten des Typs K[MLn] [MLn = Ni(CO)Cp*, Fe(CO)Cp, Co(CO)4; Cp* = 5-C5Me5, Cp = 5-C5H4Me] in Gegenwart von [Cr(CO)5thf] wurde untersucht. Mit K[Ni(CO)Cp*] bzw. K[Fe(CO)2Cp] werden die trigonal-pyramidalen Komplexe [(3-Sb){Ni(CO)Cp*}3] (1) bzw. [(3-Sb){Fe(CO)2Cp}3] (2) isoliert. Die Reaktion mit K[Co(CO)4] liefert den tetraedrisch strukturierten Cluster [Co3(CO)93-Sb{Cr(CO)5}] (3) sowie den Schmetterlings-Cluster [Co2(CO)6(-SbCl) · (-SbCl{Cr(CO)5})] (4). Alle Produkte werden durch Kristallstrukturanalysen charakterisiert. Im Unterschied zu der Bildung von P-P-Bindungen ausgehend von [(CO)5CrPCl3] bewirkt bei den untersuchten Umsetzungen ausgehend von SbCl3 die Gegenwart von [Cr(CO)5thf] keine Sb-Sb-Bindungsknüpfung.
Numerical calculation of the Riemann zeta function at odd integer arguments: A direct formula method
Creators: name: Luo, Qiang
name: Wang, Zhidan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: In this article, we introduce a recurrence formula which only involves two adjacent values of the Riemann zeta function at integer arguments. Based on the formula, an algorithm to evaluate $ζ$-values(i.e. the values of Riemann zeta function) at odd-integers from the two nearest $ζ$-values at even-integers is posed and proved. The behavior of the error bound is $O(10^{-n})$ approximately where $n$ is the argument. Our method is especially powerful for the calculation of Riemann zeta function at large argument, while for smaller ones it can also reach spectacular accuracies such as more than ten decimal places.
description: 12 pages, 1 figure
John Ridlon
Creators: name: Bohnen, Carl A., 1872-1951
Publisher: name: Galter Health Science Library & Learning Center
Year: 2016

description: Oil on canvas portrait of John Ridlon by artist Carl Bohnen. Photo of framed portrait, measuring 144 cm H x 123 cm W x 10 cm D, housed in Feinberg School of Medicine, Northwestern University, Chicago, IL. Professor of Orthopaedic Surgery, Northwestern University Medical School, 1892-1908 and Northwestern Women's Medical School, 1898-1902. The portrait was unveiled at the dedication of the Montgomery Ward Memorial Building in June 1927 and added to the collection of the Archibald Church Library. (Source: p. 71 IN: Dedication of the Montgomery Ward Memorial Building, Northwestern University Medical School, Alexander McKinlock Memorial Campus, Chicago, c.1929, Northwestern University Medical School)
Numerical proof of existence of fractional powers of Wiener processes
Creators: name: Frasca, Marco
name: Farina, Alfonso
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Using the Euler--Maruyama technique, we show that a class of Wiener processes exist that are obtained by computing an arbitrary positive power of them. This can be accomplished with a proper set of definitions that makes meaningful the realization at discrete times of these processes and make them computable. Standard results from Itō calculus for integer powers hold as we are just extending them. We provide the results from a Monte Carlo simulation with a large number of samples. We yield evidence for the existence of these processes by recovering from them the standard Brownian motion we started with after power elevation. The perfect coincidence of the numerical results we obtained is a clear evidence of existence of these processes. This could pave the way to a generalization of the concepts of stochastic integral and relative process.
description: 12 pages, 4 figures and source code. Changed the title for the sake of correctness
Seismic Intensity Measures Optimized for Low-rise Reinforced Concrete Frame Structures
Creators: name: Papasotiriou, Alexios
name: Athanatopoulou, Asimina
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Cell Biology
subject: Neuroscience
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: Two new, highly efficient single-parameter seismic intensity measures (IMs), one structure-specific and one structure-independent, are proposed for use on both bare and infilled reinforced concrete frames. The efficiency of these IMs has been evaluated along with the efficiency of several other IMs and seismic parameters over a group of 1568 bare and infilled frames. The ability of the investigated IMs to predict damage is evaluated on the basis of the correlation between IMs and the seismic damage, the dispersion of this correlation over the considered frames, its consistency across different seismic intensity levels, and its bias towards specific structural types.
Untersuchungen zur P-P-Bindungsknüpfung in der Koordinationssphäre von Übergangsmetallen
Creators: name: Gröer, Thomas
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: Phosphorus; Coordination compounds; Tungsten; Crystal structure
subject: 540 Chemie

description: Die Reaktion von [CpW(CO)3]- mit PCl3 führt zu den Dichlorphosphan-Komplexen [{Cp(CO)3W}PCl2] (1) und [{Cp(CO)3W}PCl2{WCl(CO)2Cp}] (2). Die Kristallstruktur von 2 belegt den Charakter eines Lewis-Säure/Base Adduktes dieser Verbindung. Die Reaktion von 1 bzw. von [Cr(CO)5Cp*PCl2] mit Metallaten des Typs [M(CO)3Cp]- (M = Mo, W; Cp = 5-C5H4tBu) ergibt die cyclo-P3-Ligandkomplexe [(3-P3)MCp(CO)3] (3) (M = W) und (4) (M = Mo) bzw. [(,2-P2{Cr(CO)5}2){Mo(CO)2Cp}2] (5) und [(3-PW(CO)3Cp){W(CO)2Cp}2] (6). Komplex 6 weist ein planares, homoleptisches W3P-Gerüst auf, welches innerhalb des W2P-Dreirings delokalisierte Mehrfachbindungen aufweist. Ferner führt die Reduktion von [(CO)5WPCl3] mit Magnesium zur Bildung des Phosphinidenkomplexes [{(CO)5W}2PCl], wohingegen bei der Reduktion von [Cp(CO)3WPCl2] (1) mit Mg neben P4-Phosphor der cyclo-P3-Komplex 3 entsteht.
Densitometrische Bestimmung von Anthronen und Anthrachinonen
Creators: name: Retzow, A.
name: Schäublin, J.
name: Wiegrebe, Wolfgang
Publisher: name: Universität Regensburg
Year: 1978
Subjects: subject: 540 Chemie

description: Zusammenfassung Im Zusammenhang mit unseren Arbeiten über die Metabolisierung antipsoriatisch wirksamer Anthrone wird eine Methode zur quantitativen Bestimmung der Komponenten eines Gemisches aus Anthronen und Anthrachinonen beschrieben, bei der die Substanzen dünnschichtchromatographisch getrennt und auf der Dünnschichtplatte densitometrisch bestimmt werden.
Tutti gli occhi su Dart
Creators: Rossella Spiga
Publisher: name: Media Inaf
Year: 2023

Anche il telescopio spaziale James Webb ha osservato l'impatto della sonda Dart della Nasa con l'asteroide Dimorphos, avvenuto lo scorso settembre. A seguito dell'analisi dettagliata delle immagini, è stato spostato il limite di velocità del telescopio per il tracciamento di oggetti in movimento
Onde d’urto scuotono la ragnatela cosmica
Creators: Ufficio stampa Unibo
Publisher: name: Media Inaf
Year: 2023

Per la prima volta sono state osservate tracce inequivocabili del magnetismo cosmico che viene generato alla periferia degli ammassi di galassie e dei filamenti cosmici quando enormi masse di plasma vengono verso la rete cosmica
Matera, è caccia alla “meteorite di San Valentino”
Creators: Albino Carbognani
Publisher: name: Media Inaf
Year: 2023

In seguito ai calcoli fatti sul brillante bolide osservato la sera del 14 febbraio dalle camere del progetto Prisma coordinato dall'Inaf, risulta molto probabile che, pochi km a nord di Matera, si possano trovare una o più meteoriti di qualche centimetro di diametro. Sta per iniziare la ricerca sul campo: ecco come raccogliere correttamente una meteorite e chi avvisare nel caso di ritrovamento di una pietra sospetta
Meteorite recuperata in Normandia
Creators: Albino Carbognani
Publisher: name: Media Inaf
Year: 2023

Nelle prime ore del mattino del 13 febbraio 2023 il piccolo asteroide 2023 CX1 è caduto sulla Terra in prossimità delle coste della Normandia. Nel pomeriggio del 15 febbraio un team di Fripon/Vigie-Ciel ha recuperato una meteorite del peso di circa 100 grammi: la prima meteorite recuperata in Francia dal 2011 e la terza associata a un asteroide scoperto poche ore prima di cadere
Come la Via Lattea, un miliardo d’anni luce più in là
Creators: Valentina Guglielmo
Publisher: name: Media Inaf
Year: 2023

È una “gemella” della nostra galassia. A scovarla – durante le prove generali dei suoi strumenti, lo scorso maggio – è stato il telescopio spaziale Webb. E non ci sono dubbi:  Leda 2046648, questo il suo nome, è una galassia molto simile alla Via Lattea. Si trova, però, a più di un miliardo di anni luce di distanza. Ma Webb ha la capacità unica di vederne la struttura nel dettaglio