cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Spatially resolved observations of a split-band coronal type-II radio burst
Creators: name: Zimovets, I.
name: Vilmer, N.
name: Chian, A. C. -L.
name: Sharykin, I.
name: Struminsky, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. The origin of coronal type-II radio bursts and of their band-splitting are still not fully understood. Aims. To make progress in solving this problem on the basis of one extremely well observed solar eruptive event. Methods. The relative dynamics of multi-thermal eruptive plasmas, observed in detail by the SDO/AIA and of the harmonic type-II burst sources, observed by the NRH at ten frequencies from 445 to 151 MHz, is studied for the partially behind the limb event on 3 November 2010. Special attention is given to the band-splitting of the burst. Analysis is supplemented by investigation of coronal hard X-ray (HXR) sources observed by the RHESSI. Results. It is found that the flare impulsive phase was accompanied by the formation of a double coronal HXR source, whose upper part coincided with the hot (T~10 MK) eruptive plasma blob. The leading edge (LE) of the eruptive plasmas (T~1-2 MK) moved upward from the flare region with the speed of v=900-1400 km/s. The type II burst source initially appeared just above the LE apex and moved with the same speed and in the same direction. After about 20 s it started to move about twice faster, but still in the same direction. At any given moment the low frequency component (LFC) source of the splitted type-II burst was situated above the high frequency component (HFC) source, which in turn was situated above the LE. It is also found that at a given frequency the HFC source was located slightly closer to the photosphere than the LFC source. Conclusions. The shock wave, which could be responsible for the observed type-II radio burst, was initially driven by the multi-temperature eruptive plasmas, but later transformed to a freely propagating blast shock wave. The most preferable interpretation of the type-II burst splitting is that its LFC was emitted from the upstream region of the shock, whereas the HFC - from the downstream region.
description: 14 pages, 10 figures
Electrostatic Conversion for Vibration Energy Harvesting
Creators: name: Boisseau, S.
name: Despesse, G.
name: Seddik, B. Ahmed
Publisher: name: arXiv
Year: 2012
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: This chapter focuses on vibration energy harvesting using electrostatic converters. It synthesizes the various works carried out on electrostatic devices, from concepts, models and up to prototypes, and covers both standard (electret-free) and electret-based electrostatic vibration energy harvesters (VEH).
description: This is an author-created, un-copyedited version of a chapter accepted for publication in Small-Scale Energy Harvesting, Intech. The definitive version is available online at: http://dx.doi.org/10.5772/51360 Please cite as: S. Boisseau, G. Despesse and B. Ahmed Seddik, Electrostatic Conversion for Vibration Energy Harvesting, Small-Scale Energy Harvesting, Intech, 2012
Periacma ziyangensis Wang & Zheng 1995
Creators: name: Wang, S. X.
name: Li, H. H.
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Oecophoridae
Periacma
Periacma ziyangensis

description: Periacma ziyangensis Wang & Zheng, 1995 (Figure 9) Periacma ziyangensis Wang & Zheng, 1995: 7. Wing expanse: 15.0–17.0 mm. Material examined: Holotype: „, Ziyang (32 ° 33 9 N, 108 ° 32 9 E), Shaanxi Province, 350 m, 21 May 1994, coll. Jin Zhou. Allotype: ♀, 22 May 1994, same location data as holotype. Additional material: 1 „, 3 ♀♀, Ziyang, Shaanxi Province, 7 June 1973, coll. Feng Yuan and Chou Tian; 1 „, Ankang (32 ° 41 9 N, 109 ° 01 9 E), Shaanxi Province, 800 m, 5 July 2003, coll. Haili Yu; 10 „„, 11 ♀♀, Mt. Emei (29 ° 32 9 N, 103 ° 19 9 E), Sichuan Province, 24 May– 12 June 1979; 46 „„, 18 ♀♀, Chishui (28 ° 34 9 N, 105 ° 42 9 E), Guizhou Province, 390–500 m, 27–31 May 2000, coll. Yanli Du. Distribution: China (Beijing, Heilongjiang, Guizhou, Shaanxi, Sichuan) Remarks: This species is characterized by the gnathos with the ventral plate somewhat axe-like, the sacculus roundly projected near distal end, and the aedeagus with a narrow band at middle in the male genitalia; and the corpus bursae without signum but with two slightly sclerotized areas in the female genitalia.
description: Published as part of Wang, S. X. & Li, H. H., 2006, Review of the genus Periacma Meyrick (Lepidoptera, Oecophoridae) from China, with descriptions of four new species, pp. 2371-2393 in Journal of Natural History 40 (41 - 43) on page 2379, DOI: 10.1080/00222930601088123, http://zenodo.org/record/5231741
COVID-19 Spread NetLogo ABM
Creators: name: Yust, Anne
name: Talwar, Saharsh
Publisher: name: QUBES Educational Resources
Year: 2023

description: This project aimed to utilize agent-based modeling in NetLogo to create a simulation of COVID-19 spread in a traditional college classroom. The model allows for an evaluation of different preventative measures implemented by the University of Pittsburgh, including the cohort attendance model, mask and vaccine mandates, contact tracing, and classroom sanitation. Through the use of the model's interactive interface, the impact of adjusting specific variables can be visualized and analyzed, providing a valuable tool for combating diseases that spread through droplet transmission.
Angular momentum and galaxy formation revisited
Creators: name: Romanowsky, Aaron J.
name: Fall, S. Michael
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Motivated by new kinematic data in the outer parts of early-type galaxies (ETGs), we re-examine angular momentum (AM) in all galaxy types. We present methods for estimating the specific AM j, focusing on ETGs, to derive relations between stellar j_* and mass M_* (after Fall 1983). We perform analyses of 8 galaxies out to ~10 R_e, finding that data at 2 R_e are sufficient to estimate total j_*. Our results contravene suggestions that ellipticals (Es) harbor large reservoirs of hidden j_* from AM transport in major mergers. We carry out a j_*-M_* analysis of literature data for ~100 nearby bright galaxies of all types. The Es and spirals form parallel j_*-M_* tracks, which for spirals is like the Tully-Fisher relation, but for Es derives from a mass-size-rotation conspiracy. The Es contain ~3-4 times less AM than equal-mass spirals. We decompose the spirals into disks+bulges and find similar j_*-M_* trends to spirals and Es overall. The S0s are intermediate, and we propose that morphological types reflect disk/bulge subcomponents following separate j_*-M_* scaling relations -- providing a physical motivation for characterizing galaxies by mass and bulge/disk ratio. Next, we construct idealized cosmological models of AM content, using a priori estimates of dark matter halo spin and mass. We find that the scatter in halo spin cannot explain the spiral/E j_* differences, but the data are matched if the galaxies retained different fractions of initial j (~60% and ~10%). We consider physical mechanisms for j_* and M_* evolution (outflows, stripping, collapse bias, merging), emphasizing that the vector sum of such processes must produce the observed j_*-M_* relations. A combination of early collapse and multiple mergers (major/minor) may account for the trend for Es. More generally, the observed AM variations represent fundamental constraints for any galaxy formation model.
description: ApJS, in press, 61 pages, 34 figures, abstract abridged
Didaktische Prioritäten des Sachunterrichts.: Impulsreferat zum Thema „Der Unterrichtsprozess als didaktische Priorität des Sachunterrichts“ anlässlich der Verabschiedung von Prof. Dr. Roland Lauterbach am 14. Juli 2006 an der Universität Hildesheim
Creators: name: Tänzer, Sandra
Publisher: name: widerstreit sachunterricht
Year: 2007
Subjects: subject: 000

description: Impulsreferat zum Thema „Der Unterrichtsprozess als didaktische Priorität des Sachunterrichts“ anlässlich der Verabschiedung von Prof. Dr. Roland Lauterbach am 14. Juli 2006 an der Universität Hildesheim.
Additional file 5: of Transcriptomic analysis of Eruca vesicaria subs. sativa lines with contrasting tolerance to polyethylene glycol-simulated drought stress
Creators: name: Huang, Bang-Lian
name: Li, Xuan
name: Liu, Pei
name: Ma, Lan
name: Wu, Wenhua
name: Zhang, Xuekun
name: Li, Zaiyun
name: Huang, Bangquan
Publisher: name: figshare
Year: 2019
Subjects: subject: Biochemistry
subject: Physical Sciences not elsewhere classified
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Chemical Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology

description: Table S3 KEGG pathway enrichment for DEGs specifically in DT-MS vs DT-PEG. (DOCX 19 kb)
title: Venire a Roma, restare a Roma. Forestieri e stranieri fra Quattro e Settecento
Creators: name: Cabibbo, Sara
name: Serra, Alessandro
Publisher: name: RomaTrE-Press
Year: 2018

description: Nel processo di trasformazione delle città in capitali e di creazione di strutture materiali e simboliche che facessero da sfondo alle nuove corti e al ruolo da esse assunto nello scenario europeo di età moderna, la città di Roma si distingue per il suo richiamo alla romanità e al suo ruolo di centro della cristianità: elementi che tracciano l’immagine della patria communis per quanti vi si vogliano stabilire o soggiornarvi temporaneamente. Iscrivendosi in un settore di studi che ha privilegiato il carattere ‘aperto’ delle città di Antico Regime guardando alla mobilità come ad un fattore intrinseco, i saggi qui raccolti ripercorrono i percorsi di individui e gruppi provenienti dagli Antichi Stati Italiani o d’Oltralpe attraverso la documentazione fornita dalle tante istituzioni che presiedevano all’accoglienza o che controllavano le identità confessionali e i comportamenti degli inurbati. La varietà della rete di istituzioni che accolsero i bisogni e le aspettative degli ‘immigrati’ costituisce la peculiarità di questo volume, in cui le indagini dei diversi autori, gli spazi e i tempi da essi investigati, compongono un mosaico che vuole dar conto, attraverso le quattro sezioni in cui è suddiviso, dei diversi sguardi che si posarono sui forestieri e del variegato e talora contraddittorio rapporto di costoro con la società d’accoglienza. Ciò nel tentativo di approssimarsi ad un’immagine della Roma moderna in cui convivono diversi tipi di società – quella globalizzata, quella corporata, quella clientelare – e in cui si sovrappongono e si intersecano, col fluire delle generazioni e delle ondate migratorie, identità molteplici.
Periacma zhouzhiensis Wang & Zheng 1995
Creators: name: Wang, S. X.
name: Li, H. H.
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Oecophoridae
Periacma
Periacma zhouzhiensis

description: Periacma zhouzhiensis Wang & Zheng, 1995 (Figures 10 and 39) Periacma zhouzhiensis Wang & Zheng, 1995: 9. Wing expanse: 14.0–16.0 mm. Female genitalia (Figure 39): Papilla analis caudally rounded. Apophysis posterioris thicker and longer than apophysis anterioris. Lamella postvaginalis wrinkly, caudally with median 1/3 protruded backward. Ostium bursae small. Antrum anteriorly produced into two triangular processes; caudal margin rounded, concave at middle. Ductus bursae a little longer than corpus bursae. Corpus bursae elliptical; signum a minute thorn. Material examined: Holotype: „, Zhouzhi (34 ° 10 9 N, 108 ° 12 9 E), Shaanxi Province, 1000 m, 13 July 1987, coll. Houhun Li. Additional material: 3 „„, Neixiang (33 ° 02 9 N, 111 ° 50 9 E), Henan Province, 1350 m, 13 July 1998, coll. Houhun Li; 2 „„, Xixia (33 ° 18 9 N, 111 ° 29 9 E), Henan Province, 890 m, 16–17 July 1998, coll. Houhun Li; 1 „, Lushi (34 ° 03 9 N, 111 ° 02 9 E), Henan Province, 650 m, 12 July 1998, coll. Dandan Zhang; 1 „, 2 ♀♀, Dengfeng (34 ° 27 9 N, 113.02 ° E), Henan Province, 700–800 m, 9–15 June 2000, coll. Haili Yu; 1 „, Jiyuan (35 ° 04 9 N, 112 ° 35 9 E), Henan Province, 700 m, 7 June 2000, coll. Haili Yu; 2 „„, 4 ♀♀, Huixian (35 ° 27 9 N, 113 ° 47 9 E), Henan Province, 780 m, 12–13 July 2002, coll. Xinpu Wang; 2 „„, Songxian (34 ° 28 9 N, 112 ° 55 9 E), Henan Province, 580 m, 18–20 July 2002, coll. Xinpu Wang; 1 „, 1 ♀, Shennongjia (31 ° 45 9 N, 110 ° 40 9 E), Hubei Province, 950 m, 3–4 July 1980, collector unknown; 1 „, 1 ♀, Shennongjia, Hubei Province, 1100–1200 m, 17–19 July 2003. Distribution: China (Henan, Hubei, Shaanxi). Remarks: This species is distinguished by the gnathos more or less T-shaped, the valva with distal two-thirds nearly parallel-sided and the dorso-proximal process distally bulbous in the male genitalia. The female of this species is described for the first time.
description: Published as part of Wang, S. X. & Li, H. H., 2006, Review of the genus Periacma Meyrick (Lepidoptera, Oecophoridae) from China, with descriptions of four new species, pp. 2371-2393 in Journal of Natural History 40 (41 - 43) on pages 2379-2380, DOI: 10.1080/00222930601088123, http://zenodo.org/record/5231741
On embeddings into compactly generated groups
Creators: name: Caprace, Pierre-Emmanuel
name: Cornulier, Yves
Publisher: name: arXiv
Year: 2012
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 22D05 (Primary) 05C63, 20E18, 57S30 (Secondary)

description: We prove that there is a second countable locally compact group that does not embed as a closed subgroup in any compactly generated locally compact group, and discuss various related embedding and non-embedding results.
description: 16 pages, no figure
Epitomapta Heding 1928
Creators: name: Solis-Marin, Francisco Alonso
name: Conejeros-Vargas, Carlos Andres
name: Caballero-Ochoa, Andrea Alejandra
name: Byers, Sheila Colleen
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Echinodermata
Holothuroidea
Apodida
Synaptidae

description: Subfamily Leptosynaptinae Smirnov, 1989
Diagnosis.
Pinnate tentacles 10, 11 or 12, with 1-9 digits on each side. Digits increase in size from base to tip of tentacle. Anchor plate develops from a rod which lies at a right angle to stock of developing anchor. Anchor plates with small number of holes, usually seven (6+1) in main part of the plate: six holes form a circle around a central hole. Articular end of plate usually has a “ledge” for contact with anchor keel. Anchor arms regularly serrated, rarely smooth, and without minute knobs on the vertex (Heding 1928; Smirnov 1989).
description: Published as part of Solis-Marin, Francisco Alonso, Conejeros-Vargas, Carlos Andres, Caballero-Ochoa, Andrea Alejandra & Byers, Sheila Colleen, 2023, Epitomapta aumakua sp. nov., a new species of apodous sea cucumber from Hawai'i (Echinodermata, Holothuroidea, Apodida), pp. 73-80 in ZooKeys 1183 on page 73, DOI: 10.3897/zookeys.1183.111620
CO Structure of the 21 Micron Source IRAS 22272+5435: A Sign of a Jet Launch?
Creators: name: Nakashima, Jun-ichi
name: Koning, Nico
name: Volgenau, Nikolaus H.
name: Kwok, Sun
name: Yung, Bosco H. K.
name: Zhang, Yong
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report the results of radio interferometric observations of the 21-micron source IRAS 22272+5435 in the CO J=2-1 line. 21-micron sources are carbon-rich objects in the post-AGB phase of evolution which show an unidentified emission feature at 21 micron. Since 21-micron sources usually also have circumstellar molecular envelopes, the mapping of CO emission from the envelope will be useful in tracing the nebular structure. From observations made with the Combined Array for Research in Millimeter-wave Astronomy (CARMA), we find that a torus and spherical wind model can explain only part of the CO structure. An additional axisymmetric region created by the interaction between an invisible jet and ambient material is suggested.
description: 31 pages, 13 figures; accepted for publication in ApJ; full resolution version is available from http://web.hku.hk/~junichi/paper/
Periacma tianshuiensis Wang & Zheng 1995
Creators: name: Wang, S. X.
name: Li, H. H.
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Oecophoridae
Periacma
Periacma tianshuiensis

description: Periacma tianshuiensis Wang & Zheng, 1995 (Figure 11) Periacma tianshuiensis Wang & Zheng, 1995: 9. Wing expanse: 12.0–18.0 mm. Material examined: Holotype: „, Fengxian (33 ° 55 9 N, 106 ° 31 9 E), Shaanxi Province, 1600 m, 9 July 1988, coll. Houhun Li. Allotype: ♀, Tianshui (34 ° 37 9 N, 105 ° 42 9 E), Gansu Province, 11 August 1988, coll. Xingyu Wu. Paratypes: 1 „, 10 July 1998, same locality data as holotype; 3 „„, 1 ♀, 9–10 July 1988, same locality data as allotype. Distribution: China (Gansu, Shaanxi). Remarks: This species is characterized by the sacculus not curved. It is related to P. orthiodes, but can be distinguished by the gnathos apically blunt and the sacculus much longer in the male genitalia; and the signum absent in the female genitalia.
description: Published as part of Wang, S. X. & Li, H. H., 2006, Review of the genus Periacma Meyrick (Lepidoptera, Oecophoridae) from China, with descriptions of four new species, pp. 2371-2393 in Journal of Natural History 40 (41 - 43) on page 2380, DOI: 10.1080/00222930601088123, http://zenodo.org/record/5231741
Der Sachunterricht des „eigenen Lebens“ – Grundkonzeption und empirische Relevanz
Creators: name: Daum, Egbert
Publisher: name: widerstreit sachunterricht
Year: 2006
Subjects: subject: 000

description: Die Bezüge des Sachunterrichts zum Leben sind recht intensiv und vielfältig. Wirft man einen ersten, oberflächlichen Blick in die Richtlinien und Lehrpläne der deutschen Bundesländer, so stößt man schnell auf die Begriffe „Lebenswirklichkeit“ bzw. auch „Lebenswelt“, die in Formulierungen von präambelhafter Bedeutsamkeit fast immer gleich am Anfang stehen. Ich zitiere das Beispiel der Niedersächsischen Rahmenrichtlinien exemplarisch (Der niedersächsische Kultusminister 1982, S. 5): „Der Sachunterricht hat die Aufgabe, dem Schüler Ausschnitte der Lebenswirklichkeit zu erschließen, soweit sie für ihn bedeutsam und zugänglich sind.“ Ähnlich die Richtlinien in Nordrhein-Westfalen (Ministerium ... NRW 1997, S. 21): Der Sachunterricht habe die Aufgabe, ,,Kindern Hilfe bei der Erschließung ihrer Lebenswirklichkeit zu geben“. Auch der NRW-Entwurf vom Oktober 2002 bleibt dieser Orientierung (Ministerium ... NRW 2002) treu: „Die Aufgabe des Sachunterrichts in der Grundschule ist es, den Kindern Orientierungen und Hilfen zu geben zum Verständnis, der Erschließung und der Mitgestaltung ihrer Lebenswirklichkeit ...“ Doch dies ist nicht mein Thema hier. Ich möchte der Diskussion um die lebensphilosophische, anthropologisch orientierte Grundlegung des Sachunterrichts, die sich bisher hauptsächlich auf die genannten Begriffe „Lebenswirklichkeit“ bzw. „Lebenswelt“ konzentriert hat (vgl. Daum 1998), einen weiteren Akzent hinzufügen – das „eigene Leben“. Denn das wirkliche Leben ist nicht unbedingt das „eigene Leben“. Lebenswirklichkeit geht oft am „eigenen Leben“ vorbei. Theoretische Vorgaben zum Konzept des „eigenen Lebens“ finden sich vor allem bei Ulrich Beck (u.a. 1995), aber auch bei Ronald Hitzler (1997) oder Hans Günther Homfeldt (1993).
Algebraic special functions and so(3,2)
Creators: name: Celeghini, E.
name: del Olmo, M. A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Group Theory (math.GR)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 22E.70, 33C.45, 42C.05, 81T.05

description: A ladder structure of operators is presented for the associated Legendre polynomials and the spherical harmonics showing that both belong to the same irreducible representation of so(3,2). As both are also bases of square-integrable functions, the universal enveloping algebra of so(3,2) is thus shown to be isomorphic to the space of linear operators acting on the L^2 functions defined on (-1,1) x Z and on the sphere S^2, respectively. The presence of a ladder structure is suggested to be the general condition to obtain a Lie algebra representation defining in this way the "algebraic special functions" that are proposed to be the connection between Lie algebras and square-integrable functions so that the space of linear operators on the L^2 functions is isomorphic to the universal enveloping algebra.
description: 17 pages, 6 figures
1. Beiheft - 2004: Interkulturelles Lernen im Sachunterricht - Historie und Perspektive
Creators: name: Stoklas, Katharina
Publisher: name: widerstreit sachunterricht
Year: 2004
Subjects: subject: 000

description: Die Rede über Kultur hat Konjunktur. Auch in den Erziehungswissenschaften – und innerhalb dieser in den Fachdidaktiken – verdichtet sich im Kultur-Begriff eine schwer entwirrbare Gemengelage soziologisch, ethnologisch und politisch akzentuierter Analysekategorien, denen eine mindestens hinreichende theoretische Trennschärfe bei der Beschreibung und pädagogischen Reflexion unterrichtlich relevanter Milieus zugemutet wird. Erziehungswissenschaftliche Argumentationen werden zudem von einem normativen Faden subrationaler Denk- und Argumentationsweisen gleichsam „unterlaufen“. Nicht zuletzt dadurch droht die Rede über Kultur schwammig zu werden. Ein Kultur-Begriff, der mehr durch Diffusität als durch eine theoretisch differenzierte und sprachlich artikulierte Binnenstruktur gekennzeichnet ist, konstituiert aber nicht nur rauschende Diskurse. Auf seiner Grundlage werden auch Seins- und Sollens-Sätze ausgesagt, die gegenüber ungewollter Vereinnahmung schwer zu sichern sind. Risiken der Umprogrammierung sind prophylaktisch am ehesten dann zu vermeiden, wenn theoretische, diskursiv-praktische und wissenschaftspolitische Sensibilität zur Wahrnehmung von Differenzen entwickelt ist – von Differenzen innerhalb postmodern hybrider Kulturkollagen wie innerhalb der Denk- und Sprechkultur der scientific community. Die vorliegende Arbeit von Katharina Stoklas über >Interkulturelles Lernen im Sachunterricht< ist ein Forschungsbeitrag zur Fachdidaktik. Im Rückblick auf eine in ihren bildungstheoretischen und gesellschaftspolitischen Denkvoraussetzungen heute weitgehend überwundene „Ausländerpädagogik“ diskutiert die Verfasserin das Problem „kultureller Differenz“. Dabei folgt die Aufarbeitung der diesem diskursiven Feld zuzuordnenden Debatten den historischen Phasen, die durch je spezifische didaktischpolitisch- ideologische Akzente gekennzeichnet sind. Die Rekonstruktion des (fachdidaktischen) Lebenswelt-Begriffes leistet einen wichtigen Beitrag für den Aufbau eines erweiterten Kultur-Verständnisses. Element der kritischen Rekonstruktion der fachdidaktischen Geschichte des Sachunterrichts ist eine Auseinandersetzung mit den Phasen heimatkundlichen Denkens. Hier rückt auch das Thema der Differenz in den Mittelpunkt – als Frage nach dem didaktischen Umgang mit dem Eigenen und Fremden. Es werden nicht situative, beispielhaft an Fällen illustrierte Differenzen im Sinne von „Unterschieden“ fokussiert; vielmehr geht es um strukturelle Differenz.
Periacma fengxianensis Wang & Zheng 1995
Creators: name: Wang, S. X.
name: Li, H. H.
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Oecophoridae
Periacma
Periacma fengxianensis

description: Periacma fengxianensis Wang & Zheng, 1995 (Figure 12) Periacma fengxianensis Wang & Zheng, 1995: 12. Wing expanse: male 12.0–14.0 mm. Material examined: Holotype: „, Zhouzhi (34 ° 10 9 N, 108 ° 12 9 E), Shaanxi Province, 1750 m, 20 July 1987, coll. Houhun Li. Allotype: ♀, Fengxian (33 ° 55 9 N, 106 ° 31 9 E), Shaanxi Province, 1600 m, 13 July 1988, coll. Houhun Li. Paratypes: 1 „, 2 ♀♀, 16– 20 July 1987, other same data as holotype; 1 „, 14 July 1988, same locality data as allotype. Additional material: 2 „„, Ningshan (33 ° 19 9 N, 108 ° 20 9 E), Shaanxi Province, 3 July 1995, coll. Hongyan Qin. Distribution: China (Shaanxi). Remarks: This species is characterized by the gnathos with the ventral margin straight and the aedeagus with the distal portion dentate at both sides in the male genitalia; and the corpus bursae with two differently shaped signa in the female genitalia.
description: Published as part of Wang, S. X. & Li, H. H., 2006, Review of the genus Periacma Meyrick (Lepidoptera, Oecophoridae) from China, with descriptions of four new species, pp. 2371-2393 in Journal of Natural History 40 (41 - 43) on page 2380, DOI: 10.1080/00222930601088123, http://zenodo.org/record/5231741
The role of cold gas and environment on the stellar mass - metallicity relation of nearby galaxies
Creators: name: Hughes, T. M.
name: Cortese, L.
name: Boselli, A.
name: Gavazzi, G.
name: Davies, J. I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate the relationship between stellar mass, metallicity and gas content for a magnitude- and volume-limited sample of 260 nearby late-type galaxies in different environments, from isolated galaxies to Virgo cluster members. We derive oxygen abundance estimates using new integrated, drift-scan optical spectroscopy and the base metallicity calibrations of Kewley & Ellison (2008). Combining these measurements with ultraviolet to near-infrared photometry and HI 21 cm line observations, we examine the relations between stellar mass, metallicity, gas mass fraction and star formation rate. We find that, at fixed stellar mass, galaxies with lower gas fractions typically also possess higher oxygen abundances. We also observe a relationship between gas fraction and metal content, whereby gas-poor galaxies are typically more metal-rich, and demonstrate that the removal of gas from the outskirts of spirals increases the observed average metallicity by approximately 0.1 dex. Although some cluster galaxies are gas-deficient objects, statistically the stellar-mass metallicity relation is nearly invariant to the environment, in agreement with recent studies. These results indicate that internal evolutionary processes, rather than environmental effects, play a key role in shaping the stellar mass-metallicity relation. In addition, we present metallicity estimates based on observations of 478 nearby galaxies.
description: Accepted for publication in A&A. 28 pages, including 10 figures and 3 tables
Lie symmetries and reductions of multi-dimensional boundary value problems of the Stefan type
Creators: name: Cherniha, Roman
name: Kovalenko, Sergii
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 22E70, 35K61, 80A22

description: A new definition of Lie invariance for nonlinear multi-dimensional boundary value problems (BVPs) is proposed by the generalization of known definitions to much wider classes of BVPs. The class of (1+3)-dimensional nonlinear BVPs of the Stefan type, modeling the process of melting and evaporation of metals, is studied in detail. Using the definition proposed, the group classification problem for this class of BVPs is solved and some reductions (with physical meaning) to BVPs of lower dimensionality are made. Examples of how to construct exact solutions of the (1+3)-dimensional nonlinear BVP with the correctly-specified coefficients are presented.
description: Published version
2. Beiheft - 2005: Zeit des Lernens. Perspektiven auf den Sachunterricht und die Grundschul-Pädagogik
Creators: name: Westphal, Kristin
Publisher: name: widerstreit sachunterricht
Year: 2005
Subjects: subject: 000

description: Mit dem Titel „Zeit des Lernens“ verknüpfen sich verschiedene Weisen im Umgang mit dem Thema im Feld der Grundschul Pädagogik und der Fachdidaktik wie hier insbesondere dem Sach-, dem Kunst- und Theaterunterricht. Gravierend ist beispielsweise der Übergang auf institutioneller, sozialer und personaler Ebene für ein Kind vom Kindergarten zur Grundschule. Ebenso folgenreich ist der Übergang eines Grundschulkindes auf eine weiterführende Schule. Grundlegend und irreversibel ist der Übergang vom Kind zum Erwachsenen. Wurde dieser Übergang in der Zeit, bevor es die Schule gab, noch recht schnell vollzogen und hatte in der Vergangenheit einen oftmals rituellen und auch radikalen Charakter, so ist im 16. Jahrhundert mit der Schule eine Institution geschaffen worden, die einen eigenen Raum für die Kinder vorstellt, damit sie für die Zukunft vorbereitet werden und lernen. Lernzeit heißt von da an, eine Zeit für etwas zu institutionalisieren, was noch nicht ist, aber noch kommen soll, aber wie der Beitrag von Kristin Westphal zeigen will, nicht kommen wird, da die Zukunft der Kinder eine andere als die ihrer Eltern und Lehrer ist, das bedeutet ihrem Beitrag zufolge sich der Gegenwart zu öffnen.
Early-stage young stellar objects in the Small Magellanic Cloud
Creators: name: Oliveira, J. M.
name: van Loon, J. Th.
name: Sloan, G. C.
name: Sewilo, M.
name: Kraemer, K. E.
name: Wood, P. R.
name: Indebetouw, R.
name: Filipovic, M. D.
name: Crawford, E. J.
name: Wong, G. F.
name: Hora, J. L.
name: Meixner, M.
name: Robitaille, T. P.
name: Shiao, B.
name: Simon, J. D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present new observations of 34 YSO candidates in the SMC. The anchor of the analysis is a set of Spitzer-IRS spectra, supplemented by groundbased 3-5 micron spectra, Spitzer and NIR photometry, optical spectroscopy and radio data. The sources' SEDs and spectral indices are consistent with embedded YSOs; prominent silicate absorption is observed in the spectra of at least ten sources, silicate emission is observed towards four sources. PAH emission is detected towards all but two sources. Based on band ratios (in particular the strength of the 11.3 micron and the weakness of the 8.6 micron bands) PAH emission towards SMC YSOs is dominated by predominantly small neutral grains. Ice absorption is observed towards fourteen sources in the SMC. The comparison of H2O and CO2 ice column densities for SMC, LMC and Galactic samples suggests that there is a significant H2O column density threshold for the detection of CO2 ice. This supports the scenario proposed by Oliveira et al. (2011), where the reduced shielding in metal-poor environments depletes the H2O column density in the outer regions of the YSO envelopes. No CO ice is detected towards the SMC sources. Emission due to pure-rotational 0-0 transitions of H2 is detected towards the majority of SMC sources, allowing us to estimate rotational temperatures and column densities. All but one source are spectroscopically confirmed as SMC YSOs. Of the 33 YSOs identified in the SMC, 30 sources populate different stages of massive stellar evolution. The remaining three sources are classified as intermediate-mass YSOs with a thick dusty disc and a tenuous envelope still present. We propose one of the sources is a D-type symbiotic system, based on the presence of Raman, H and He emission lines in the optical spectrum, and silicate emission in the IRS-spectrum. This would be the first dust-rich symbiotic system identified in the SMC. (abridged)
description: 34 pages, 13 figures, 4 tables, accepted for publication in MNRAS main journal
Periacma binchuanensis Wang & Zheng 1996
Creators: name: Wang, S. X.
name: Li, H. H.
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Oecophoridae
Periacma
Periacma binchuanensis

description: Periacma binchuanensis Wang & Zheng, 1996 (Figures 13 and 40) Periacma binchuanensis Wang & Zheng, 1996: 32. Wing expanse: 17.0–18.0 mm. Female genitalia (Figure 40): Papilla analis relatively small. Apophysis posterioris about four times length of apophysis anterioris. Lamella postvaginalis densely spinulate. Antrum dorso-laterally extended outward. Ductus bursae thick, almost as long as corpus bursae. Corpus bursae long oval, without signum. Material examined: Holotype: „, Binchuan (25 ° 49 9 N, 100 ° 32 9 E), Yunnan Province, 2300 m, 13 June 1982, coll. Ruxing Ma. Additional material: 1 ♀, Binchuan, Yunnan Province, 1900, 22 June 1982, collector unknown; 1 ♀, Baoshan (25 ° 08 9 N, 99 ° 10 9 E), Yunnan Province, 31 May 1951, collector unknown. Distribution: China (Yunnan). Remarks: This species can be easily separated from other species of the genus by the digitate process at basal 1/5 of the costa of the valva. The female genitalia of this species are described for the first time.
description: Published as part of Wang, S. X. & Li, H. H., 2006, Review of the genus Periacma Meyrick (Lepidoptera, Oecophoridae) from China, with descriptions of four new species, pp. 2371-2393 in Journal of Natural History 40 (41 - 43) on pages 2380-2382, DOI: 10.1080/00222930601088123, http://zenodo.org/record/5231741
title: Cinema e identità italiana
Creators: name: Parigi, Stefania
name: Uva, Christian
name: Zagarrio, Vito
Publisher: name: RomaTrE-Press
Year: 2019

description: Gli atti del Convegno Internazionale di Studi “Cinema e identità italiana” (Roma, 28-29 dicembre 2017) mettono in luce la molteplicità delle prospettive con cui può essere affrontato il problema dell’identità nazionale, in un arco temporale che va dai primordi del cinema fino alla contemporaneità. Un gran numero di studiosi di varia età e provenienza si misura con metodologie e punti di vista differenti, intrecciando le dinamiche cinematografiche con la storia culturale del Paese e con il più vasto panorama intermediale.
Inference of seasonal long-memory aggregate time series
Creators: name: Chan, Kung-Sik
name: Tsai, Henghsiu
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: Time-series data with regular and/or seasonal long-memory are often aggregated before analysis. Often, the aggregation scale is large enough to remove any short-memory components of the underlying process but too short to eliminate seasonal patterns of much longer periods. In this paper, we investigate the limiting correlation structure of aggregate time series within an intermediate asymptotic framework that attempts to capture the aforementioned sampling scheme. In particular, we study the autocorrelation structure and the spectral density function of aggregates from a discrete-time process. The underlying discrete-time process is assumed to be a stationary Seasonal AutoRegressive Fractionally Integrated Moving-Average (SARFIMA) process, after suitable number of differencing if necessary, and the seasonal periods of the underlying process are multiples of the aggregation size. We derive the limit of the normalized spectral density function of the aggregates, with increasing aggregation. The limiting aggregate (seasonal) long-memory model may then be useful for analyzing aggregate time-series data, which can be estimated by maximizing the Whittle likelihood. We prove that the maximum Whittle likelihood estimator (spectral maximum likelihood estimator) is consistent and asymptotically normal, and study its finite-sample properties through simulation. The efficacy of the proposed approach is illustrated by a real-life internet traffic example.
description: Published in at http://dx.doi.org/10.3150/11-BEJ374 the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm)
Periacma simaoensis Li, Wang & Yan 1996
Creators: name: Wang, S. X.
name: Li, H. H.
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Oecophoridae
Periacma
Periacma simaoensis

description: Periacma simaoensis Li, Wang & Yan, 1996 (Figure 14) Periacma simaoensis Li, Wang & Yan, 1996: 205. Wing expanse: 16.5 mm. Material examined: Holotype: „, Simao (22 ° 48 9 N, 100 ° 58 9 E), Yunnan Province, 1325 m, 24 April 1995, coll. Guangyun Yan. Distribution: China (Yunnan). Remarks: This species resembles P. fengxianensis, but can be distinguished from the latter by the uncus not dilated apically, the sacculus heavily sclerotized distally, and the aedeagus with distal 1/6 divided into two parts.
description: Published as part of Wang, S. X. & Li, H. H., 2006, Review of the genus Periacma Meyrick (Lepidoptera, Oecophoridae) from China, with descriptions of four new species, pp. 2371-2393 in Journal of Natural History 40 (41 - 43) on page 2382, DOI: 10.1080/00222930601088123, http://zenodo.org/record/5231741
description: {"references": ["Li H, Wang S, Yan G. 1996. A new species and a new record of the oecophorid moths (Lepidoptera: Oecophoridae) from China. Entomotaxonomia 18: 205 - 208."]}
High Velocity Dispersion in A Rare Grand Design Spiral Galaxy at Redshift z=2.18
Creators: name: Law, David R.
name: Shapley, Alice E.
name: Steidel, Charles C.
name: Reddy, Naveen A.
name: Christensen, Charlotte R.
name: Erb, Dawn K.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Although relatively common in the local Universe, only one grand-design spiral galaxy has been spectroscopically confirmed to lie at z>2 (HDFX 28; z=2.011), and may prove to be a major merger that simply resembles a spiral in projection. The rarity of spirals has been explained as a result of disks being dynamically 'hot' at z>2 which may instead favor the formation of commonly-observed clumpy structures. Alternatively, current instrumentation may simply not be sensitive enough to detect spiral structures comparable to those in the modern Universe. At redshifts <2, the velocity dispersion of disks decreases, and spiral galaxies are more numerous by z~1. Here we report observations of the grand design spiral galaxy Q2343-BX442 at z=2.18. Spectroscopy of ionized gas shows that the disk is dynamically hot, implying an uncertain origin for the spiral structure. The kinematics of the galaxy are consistent with a thick disk undergoing a minor merger, which can drive the formation of short-lived spiral structure. A duty cycle of < 100 Myr for such tidally-induced spiral structure in a hot massive disk is consistent with their rarity.
description: Accepted for publication in Nature (July 19 2012). Includes 15-page supplement
MOESM1 of IMP-ICDX: an injury mortality prediction based on ICD-10-CM codes
Creators: name: Wang, Muding
name: Qiu, Wusi
name: Zeng, Yunji
name: Fan, Wenhui
name: Lian, Xiao
name: Shen, Yi
Publisher: name: figshare
Year: 2019
Subjects: subject: Microbiology
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Chemical Sciences not elsewhere classified
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Plant Biology

description: Additional file 1. The method of calculating TMR. (DOC 29 kb)
title: Miejsce rodziców w życiu lwowskich szkół średnich w okresie międzywojennym
Creators: name: Sanojca, Karol
Publisher: name: Instytut Pedagogiki Uniwersytetu Wrocławskiego
Year: 2018

description: Celem było ukazanie miejsca i roli rodziców w kontaktach z placówkami oświatowymi na poziomie szkoły średniej we Lwowie w okresie międzywojennym oraz określenie dynamiki zmian w zakresie zadań stawianych i realizowanych przez organizacje rodzicielskie.
title: Friendship and decolonising cross-cultural peace research in Aotearoa New Zealand
Creators: name: Devere, Heather
name: te maiharoa, kelli
name: Maui Solomon
name: Maata Wharehoka
Publisher: name: University of Leeds
Year: 2020
Subjects: subject: Aotearoa
subject: New Zealand
subject: decolonisiation
subject: cross-cultural
subject: peace
subject: FOS: Sociology

description: This article presents an account of collaborative, cross-cultural academic
research related to indigenous peace traditions in Aotearoa New Zealand.1
 It describes the decolonising research methodology developed by Professor Linda Tuhiwai Smith, kaupapa Māori and introduces kaupapa Moriori (that is being developed by Moriori researchers). We
then assess how these kaupapa approaches relate to the concept of friendship articulated by
Professor Preston King. We find that the collaborative model that we have developed
incorporates friendship principles that are generally in accord with kaupapa Māori and
kaupapa Moriori principles for conducting ethical, respectful cross-cultural research. Research
based on both friendship and a decolonising methodology allows for sensitive material to be
revealed in a way that avoids some of the harm research can cause to communities that have
already experienced a painful history.
description: AMITY: The Journal of Friendship Studies, 6(1), 53-87
Periacma qujingensis Wang, Li & Liu 2001
Creators: name: Wang, S. X.
name: Li, H. H.
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Oecophoridae
Periacma
Periacma qujingensis

description: Periacma qujingensis Wang, Li & Liu, 2001 (Figure 15) Periacma qujingensis Wang, Li & Liu, 2001: 266. Wing expanse: 15.0–16.5 mm. Material examined: Holotype: „, Qujing (25 ° 30 9 N, 103 ° 48 9 E), Yunnan Province, 9 July 1982. Paratypes: 1 „, 1 ♀, same data as holotype; 1 „, 1 ♀, Jinping (22 ° 47 9 N, 103 ° 12 9 E), Yunnan Province, 22 May 1956, coll. Keren Huang (IZCAS). Distribution: China (Yunnan) Remarks: This species is similar to P. ziyangensis and P. changkhianensis. It can be separated from P. ziyangensis by the sacculus with a sclerotized plate at middle of the ventral margin and a small process near distal process in the male genitalia; and the signum present in the female genitalia. It can be distinguished from P. changkhianensis by the female lamella postvaginalis with the posterior margin not concave at middle but blunt, and the anterior margin heavily sclerotized.
description: Published as part of Wang, S. X. & Li, H. H., 2006, Review of the genus Periacma Meyrick (Lepidoptera, Oecophoridae) from China, with descriptions of four new species, pp. 2371-2393 in Journal of Natural History 40 (41 - 43) on page 2382, DOI: 10.1080/00222930601088123, http://zenodo.org/record/5231741
Periacma absaccula Wang, Li & Liu 2001
Creators: name: Wang, S. X.
name: Li, H. H.
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Oecophoridae
Periacma
Periacma absaccula

description: Periacma absaccula Wang, Li & Liu, 2001 (Figure 16) Periacma absaccula Wang, Li & Liu, 2001: 268. Wing expanse: 20.0–25.0 mm. Material examined: Holotype: „, Mt. Qingcheng (30 ° 58 9 N, 103 ° 31 9 E), Sichuan Province, 19 June 1980. Paratypes: 1 „, Jianfengling (18 ° 42 9 N, 108 ° 47 9 E), Hainan Province, 25 March 1982, coll. Lingqing Chen (IZCAS); 1 „, Mt. Huang (30 ° 08 9 N, 118 ° 10 9 E), Anhui Province, 1 June 1987; 7 ♀♀, 19–21 June 1980, same locality data as holotype (2 ♀♀, in IZCAS). Additional material: 1 ♀, Mt. Huang, Anhui Province, 20 May 1986. Distribution: China (Anhui, Hainan, Sichuan). Remarks: This species is characterized by the uncus distally rhomboid and the sacculus apically truncate in the male genitalia; and the lamella antevaginalis laterally forming two large plates in the female genitalia.
description: Published as part of Wang, S. X. & Li, H. H., 2006, Review of the genus Periacma Meyrick (Lepidoptera, Oecophoridae) from China, with descriptions of four new species, pp. 2371-2393 in Journal of Natural History 40 (41 - 43) on pages 2382-2383, DOI: 10.1080/00222930601088123, http://zenodo.org/record/5231741
title: Il task nell’insegnamento delle lingue. Percorsi tra ricerca e didattica al CLA di Roma Tre
Creators: name: Cortés Velásquez, Diego
name: Nuzzo, Elena
Publisher: name: RomaTrE-Press
Year: 2018

description: Il volume raccoglie il frutto di un lavoro condotto presso il Centro Linguistico di Ateneo dell’Università Roma Tre dal marzo 2015, all’interno di un gruppo di ricerca sul Task-based Language Teaching. Si tratta di un percorso di ricerca-azione nel quale i membri del gruppo – docenti di lingua, ricercatori, studenti universitari – hanno esplorato questa prospettiva di insegnamento sia nei suoi principi teorici sia nelle sue applicazioni pratiche. Nei sei contributi che compongono il volume si cerca di proporre una visione critica e non prescrittiva, fermo restando che il nostro punto di riferimento essenziale – il task appunto – ha caratteristiche imprescindibili per essere definito tale nell’ambito dell’attività didattica. Il volume si rivolge prevalentemente a studenti universitari di discipline linguistiche e a insegnanti in servizio e in formazione.
title: La regolazione delle nuove forme della comunicazione commerciale televisiva: Product Placement e Branded Content
Creators: name: Bassan, Fabio
Publisher: name: RomaTrE-Press
Year: 2014

description: Questo volume raccoglie i contributi presentati nei seminari del 4 e 10 ottobre 2014, rispettivamente a Roma e a Milano, organizzati congiuntamente da ANICA e UPA, in merito ai risultati dell’attività del Laboratorio sul Product Placement, costituito dal Dipartimento di Studi Aziendali dell’Università Roma Tre e coordinato dal Prof. Fabio Bassan. L’attività del Laboratorio viene discussa e approvata dall’Osservatorio permanente sul product placement, costituito dall’Autorità per le garanzie nelle comunicazioni.

Il Laboratorio sul Product Placement ha sintetizzato in questo volume l’attività svolta insieme agli operatori nel settore audiovisivo per specificare la disciplina autoregolamentare, con l’obiettivo di fornire al mercato quelle certezze, sul piano tecnico e giuridico, che si auspica siano idonee ad accelerare l’utilizzo di questo strumento, nelle forme consentite dalla normativa vigente (Capitolo 5, a firma di Fabio Bassan). La sintesi dell’attività svolta e dei risultati conseguiti è preceduta da una introduzione di Carlo Alberto Pratesi e Costanza Nosi relativa alle potenzialità dello strumento sul piano del marketing (capitolo 1), da un approfondimento di Giulio Votano – responsabile AGCom per l’Osservatorio sul product placement – sulla rilevanza dello strumento dell’autoregolamentazione per lo sviluppo del product placement nel settore dell’audiovisivo (capitolo 2), e da approfondimenti di Giuseppe Liotine e Sara Mercuri – dottorandi di ricerca del Dipartimento di Studi Aziendali – sulla disciplina della direttiva AVMS e sulla sua applicazione negli Stati membri (capitoli 3 e 4, rispettivamente).
The Effects of Limited Channel Knowledge on Cognitive Radio System Capacity
Creators: name: Smith, Peter J.
name: Dmochowski, Pawel A.
name: Suraweera, Himal A.
name: Shafi, Mansoor
Publisher: name: arXiv
Year: 2012
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We examine the impact of limited channel knowledge on the secondary user (SU) in a cognitive radio system. Under a minimum signal-to-interference-and-noise ratio (SINR) constraint for the primary user (PU) receiver, we determine the SU capacity under five channel knowledge scenarios. We derive analytical expressions for the capacity cumulative distribution functions and the probability of SU blocking as a function of allowable interference. We show that imperfect knowledge of the PU-PU channel gain by the SU-Tx often prohibits SU transmission or necessitates a high interference level at the PU. We also show that errored knowledge of the PU-PU channel is more beneficial than statistical channel knowledge and imperfect knowledge of the SU-Tx to PU-Rx link has a limited impact on SU capacity.