cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Lifting of divisible designs
Creators: name: Blunck, Andrea
name: Havlicek, Hans
name: Zanella, Corrado
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 05B30, 51E20, 20B25

description: The aim of this paper is to present a construction of $t$-divisible designs for $t>3$, because such divisible designs seem to be missing in the literature. To this end, tools such as finite projective spaces and their algebraic varieties are employed. More precisely, in a first step an abstract construction, called $t$-lifting, is developed. It starts from a set $X$ containing a $t$-divisible design and a group $G$ acting on $X$. Then several explicit examples are given, where $X$ is a subset of $PG(n,q)$ and $G$ is a subgroup of $GL_{n+1}(q)$. In some cases $X$ is obtained from a cone with a Veronesean or an $h$-sphere as its basis. In other examples $X$ arises from a projective embedding of a Witt design. As a result, for any integer $t\geq 2$ infinitely many non-isomorphic $t$-divisible designs are found.
Prozesssimulation der Stadienfolge beim Schmieden mittels Rückwärtssimulation
Creators: name: Wienströer, Martin
Publisher: name: Hannover : Universität
Year: 2004
Subjects: subject: Forging
subject: backwards simulation
subject: process modelling
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: [no abstract]
Dante's Divina Commedia: Spring Lecture 12 (Paradiso 4, 5)
Creators: name: Barolini, Teodolinda
Publisher: name: Columbia University
Year: 2016
Subjects: Italian literature

description: Spring Lecture 12 of the course "Dante's Divina Commedia" taught by Teodolinda Barolini, Lorenzo da Ponte Professor of Italian at Columbia University. This iteration of her year-long Dante course was taught in two-hour, twice-weekly sessions during Fall 2015 and Spring 2016 (Dante’s Divina Commedia, Italian W4091 & W4092). Recorded February 25, 2016. 0:00 – Paradiso 4 1:04:10 – Paradiso 5
Untersuchungen zur extraluminalen Laserangioplastie und Entwicklung von Methoden zur Therapiekontrolle
Creators: name: Will, Gordon Fabian
Publisher: name: Hannover : Universität
Year: 2004
Subjects: subject: Extraluminal laser angioplasty
subject: atherosclerosis
subject: therapy control
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Working with Amiga Floppy Disks in Historical Video Game Research
Creators: name: Demleitner, Adrian
Publisher: name: hypotheses.org
Year: 2023

description: This text explores the challenges and considerations associated with researching digital-born media, particularly video games designed for the Amiga computing system. The author emphasizes the importance of experiencing games on both emulators and original hardware to capture a comprehensive understanding. The acquisition of an Amiga 500 set serves as a catalyst for the exploration, leading to the need for specialized hardware, such as the Greaseweazle, to read and write Amiga floppy disks on modern computers. The author details the process of obtaining the required components, highlighting the scarcity of certain technologies and the importance of preserving them for game preservation efforts. The text underscores the urgent need for efficient procedures to aid in the preservation of ageing video games and emphasizes the invaluable role of such technologies in the author's research project, facilitating data extraction from floppy disks and enhancing the overall research process.
Campanula thyrsoides L.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: C. thyrsoides L. Cat. 248 und 429. Bis 2800 m; abwärts bis 1450 m. l: Lovenex (J.); Sex du Coeur (J.); Linleux (J.); Col d'Outanne (J.); Planajeur bei Salvan, bei nur 1450m (Oberson 1941); Emosson (J.); Vieux-Emosson (J.). - 2: Les Cloujons am Sanetschpass, 2200m (Terretaz); Alpen von Ayent und Lens (Besse). - 3: Im Val Ferret auch zwischen L'Amone und La Fouly (Becherer und Thommen); Bonatehesse im Val de Bagnes (Miller); La Crevasse ob Chemin (A. Parvex); Boveresse ob Saxon (Closuit); La Barma und Liappey im Val des Dix (Pannatier); Val de Zinal: Col de Sorebois, 2800 m, Lirec, Arolec, Cottier (alles: Marietan). -4:Blindental(B. C. W.).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Divisible designs from twisted dual numbers
Creators: name: Blunck, Andrea
name: Havlicek, Hans
name: Zanella, Corrado
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 51E05, 51B15, 51E20, 51E25, 51A45

description: The generalized chain geometry over the local ring $K(ε;σ)$ of twisted dual numbers, where $K$ is a finite field, is interpreted as a divisible design obtained from an imprimitive group action. Its combinatorial properties as well as a geometric model in 4-space are investigated.
Telomerverkürzung in der humanen Leberzirrhose sowie Einfluss von Telomerverkürzung im Rahmen chronischer Leberschädigung auf das Überleben, die Organhomeostase und die Entwicklung von hepatozellulären Karzinomen im Mausmodell
Creators: name: Wiemann, Stefanie U.
Publisher: name: Hannover : Universität
Year: 2004
Subjects: subject: Telomere shortening
subject: liver
subject: hepatocellular carcinoma
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Diameter preserving surjections in the geometry of matrices
Creators: name: Huang, Wen-ling
name: Havlicek, Hans
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: Algebraic Geometry (math.AG)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 51A50, 15A57

description: We consider a class of graphs subject to certain restrictions, including the finiteness of diameters. Any surjective mapping $ϕ:Γ\toΓ'$ between graphs from this class is shown to be an isomorphism provided that the following holds: Any two points of $Γ$ are at a distance equal to the diameter of $Γ$ if, and only if, their images are at a distance equal to the diameter of $Γ'$. This result is then applied to the graphs arising from the adjacency relations of spaces of rectangular matrices, spaces of Hermitian matrices, and Grassmann spaces (projective spaces of rectangular matrices).
Wind Roche-lobe overflow: Application to carbon-enhanced metal-poor stars
Creators: name: Abate, C.
name: Pols, O. R.
name: Izzard, R. G.
name: Mohamed, S. S.
name: de Mink, S. E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Carbon-enhanced metal-poor stars (CEMP) are observed as a substantial fraction of the very metal-poor stars in the Galactic halo. Most CEMP stars are also enriched in s-process elements and these are often found in binary systems. This suggests that the carbon enrichment is due to mass transfer in the past from an asymptotic giant branch (AGB) star on to a low-mass companion. Models of binary population synthesis are not able to reproduce the observed fraction of CEMP stars without invoking non-standard nucleosynthesis or a substantial change in the initial mass function. This is interpreted as evidence of missing physical ingredients in the models. Recent hydrodynamical simulations show that efficient wind mass transfer is possible in the case of the slow and dense winds typical of AGB stars through a mechanism called wind Roche-lobe overflow (WRLOF), which lies in between the canonical Bondi-Hoyle-Lyttleton (BHL) accretion and Roche-lobe overflow. WRLOF has an effect on the accretion efficiency of mass transfer and on the angular momentum lost by the binary system. The aim of this work is to understand the overall effect of WRLOF on the population of CEMP stars. To simulate populations of low-metallicity binaries we combined a synthetic nucleosynthesis model with a binary population synthesis code. In this code we implemented the WRLOF mechanism. We used the results of hydrodynamical simulations to model the effect of WRLOF on the accretion efficiency and we took the effect on the angular momentum loss into account by assuming a simple prescription. As a result the number of CEMP stars predicted by our model increases by a factor 1.2-1.8 compared to earlier results that consider the BHL prescription. Moreover, higher enrichments of carbon are produced and the final orbital period distribution is shifted towards shorter periods.
description: 12 pages, 9 figures, accepted for publication in A&A
Charakterisierung der Substratspezifität clostridieller Neurotoxine
Creators: name: Sikorra, Stefan
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2008
Subjects: subject: Clostridielle Neurotoxine
subject: VAMP
subject: SNAP-25
subject: Substraterkennung
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
A dynamically-packed planetary system around GJ667C with three super-Earths in its habitable zone
Creators: name: Anglada-Escudé, Guillem
name: Tuomi, Mikko
name: Gerlach, Enrico
name: Barnes, Rory
name: Heller, René
name: Jenkins, James S.
name: Wende, Sebastian
name: Vogt, Steven S.
name: Butler, R. Paul
name: Reiners, Ansgar
name: Jones, Hugh R. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Since low-mass stars have low luminosities, orbits at which liquid water can exist on Earth-sized planets are relatively close-in, which produces Doppler signals that are detectable using state-of-the-art Doppler spectroscopy. GJ 667C is already known to be orbited by two super-Earth candidates. We investigate whether the data supports the presence of additional companions. We obtain new Doppler measurements from HARPS extracted spectra and combined them with those obtained from the PFS and HIRES spectrographs. We used Bayesian and periodogram-based methods to re-assess the number of candidates and evaluated the confidence of each detection. Among other tests, we validated the planet candidates by analyzing correlations of each Doppler signal activity indices and investigate quasi-periodicity. Doppler measurements of GJ 667C are described better by six Keplerian-like signals: the two known candidates (b and c); three additional few-Earth mass candidates with periods of 92, 62 and 39 days (d, e and f); a cold super-Earth in a 260-day orbit (g) and tantalizing evidence of a $\sim$ 1 M$_\oplus$ object in a close-in orbit of 17 days (h). We explore whether long-term stable orbits are compatible with the data by integrating 8$\times 10^4$ solutions derived from the Bayesian samplings. The system consisting of six planets is compatible with dynamically stable configurations. As for the solar system, the most stable solutions do not contain mean-motion resonances and are described well by analytic Laplace-Lagrange solutions. The presence of a seventh planet (h) is supported by the fact that it appears squarely centered on the only island of stability left in the six-planet solution. Habitability assessments accounting for the stellar flux, as well as tidal dissipation effects, indicate that three (maybe four) planets are potentially habitable...
description: Accepted for publication in A&A
Phase transitions of dense neutron matter with generalized Skyrme interaction to superfluid states with triplet pairing in strong magnetic field
Creators: name: Tarasov, Alexander N.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A generalized non-relativistic Fermi-liquid approach was used to find analytical formulas for temperatures $T_{c,1}(n,H)$ and $T_{c,2}(n,H)$ (which are functions nonlinear of density n and linear of magnetic field H) of phase transitions in spatially uniform dense pure neutron matter from normal to superfluid states with spin-triplet p-wave pairing (similar to anisotropic superfluid phases $^3He-A_{1}$ and $^3He-A_{2}$) in steady and homogeneous strong magnetic field (but $|μ_{n}| H\ll E_{c}
description: 4 pages, 2 figures; Proceedings of the 26th International Conference on Low Temperature Physics (LT26), Beijing, China, 10-17 August 2011
Die deutsche Banane : Wirtschafts- und Kulturgeschichte der Banane im Deutschen Reich 1900 - 1939
Creators: name: Wilke, Kerstin
Publisher: name: Hannover : Universität
Year: 2004
Subjects: subject: Banana trade
subject: colonial groceries
subject: product history
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::380 | Handel, Kommunikation, Verkehr

description: [no abstract]
Rotation Minimizing vector fields and frames in Riemannian manifolds
Creators: name: Etayo, Fernando
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 57R25, 53C40, 53A04

description: We prove that a normal vector field along a curve in R3 is rotation minimizing (RM) if and only if it is parallel respect to the normal connection. This allows us to generalize all the results of RM vectors and frames to curves immersed in Riemannian manifolds.
Dante's Divina Commedia: Spring Lecture 11 (Paradiso 2, 3)
Creators: name: Barolini, Teodolinda
Publisher: name: Columbia University
Year: 2016
Subjects: Italian literature

description: Spring Lecture 11 of the course "Dante's Divina Commedia" taught by Teodolinda Barolini, Lorenzo da Ponte Professor of Italian at Columbia University. This iteration of her year-long Dante course was taught in two-hour, twice-weekly sessions during Fall 2015 and Spring 2016 (Dante’s Divina Commedia, Italian W4091 & W4092). Recorded February 23, 2016. 0:00 – Paradiso 2 49:08 – Paradiso 3
All-optical Hall effect by the dynamic toroidal moment in a cavity-based metamaterial
Creators: name: Dong, Zheng-Gao
name: Zhu, Jie
name: Yin, Xiaobo
name: Li, Jiaqi
name: Lu, Changgui
name: Zhang, Xiang
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Dynamic dipolar toroidal response is demonstrated by an optical plasmonic metamaterial composed of double disks. This response with a hotspot of localized E-field concentration is a well-behaved toroidal cavity mode that exhibits a large Purcell factor due to its deep-subwavelength mode volume. All-optical Hall effect (photovoltaic) due to this optical toroidal moment is demonstrated numerically, in mimicking the magnetoelectric effect in multiferroic systems. The result shows a promising avenue to explore various optical phenomena associated with this intriguing dynamic toroidal moment.
description: 21 pages, 6 figures
Beeinflussung der Polymer-Füllstoff-Wechselwirkung durch Oberflächenmodifizierung von Füllstoffen
Creators: name: Ziegler, Jonas
Publisher: name: Hannover : Universität
Year: 2004
Subjects: subject: Silica
subject: silanization
subject: filler distribution
subject: Dewey Decimal Classification::600 | Technik::660 | Technische Chemie

description: [no abstract]
Letters from George Washington Carver to Ira Manville
Creators: name: Carver, George Washington, 1864?-1943
Publisher: name: Unknown
Year: 1936
Subjects: Diet, Food, and Nutrition
Nutritional Sciences
Research
Malus

description: Four letters from George Washington Carver (Tuskegee Institute) to Ira A. Manville (University of Oregon Medical School) regarding Manville's research into the nutritional value of apples
THEORETICAL AND CONCEPTUAL ASPECTS OF THE LEADERSHIP PHENOMENON
Creators: name: Nasirova, Nilufar
Publisher: name: Zenodo
Year: 2025

description: This article explores the theoretical and conceptual aspects of the leadership phenomenon. The essence of leadership is analyzed from the perspectives of various political theory schools. Based on approaches to transformational, charismatic, and institutional leadership, the role of the leader in political and social contexts is revealed. Furthermore, leadership models at global and national levels are compared, and the impact level of leaders in modern political systems is assessed.
A gaseous proportional counter built from a conventional aluminium beverage can
Creators: name: Winkler, Alexander
name: Karadzhinova, Aneliya
name: Hildén, Timo
name: Garcia, Francisco
name: Fedi, Giacomo
name: Devoto, Francesco
name: Brücken, Erik J.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Physics Education (physics.ed-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The gaseous proportional counter is a device that can be used to detect ionizing radiation. These devices can be as simple as a cylindrical cathode and a very thin anode wire centered along its axis. By applying a high voltage, a strong electric field is generated close to the anode wire. Ion-pairs, generated by passing ionizing radiation, create avalanches once they drift into the strong electric field region near the anode. The electrical charges created by the avalanche generate an observable signal which is proportional to the energy loss of the incoming radiation. We discuss the construction of such a device. Our detector was built from an ordinary aluminium beverage can and uses a common electric wire strand as the anode. The construction of this detector offers students at universities or technically oriented high schools a detailed understanding of the design and operation of gaseous radiation detectors. The equipment required to complete the project should be available at most institutions.
description: 9 pages, 13 figures
Entwicklung eines fetalspezifischen Antikörpers zur Charakterisierung fetaler erythroider Zellen
Creators: name: Zimmermann, Silke
Publisher: name: Hannover : Universität
Year: 2004
Subjects: subject: Fetal erythropoiesis
subject: immunophenotyping
subject: monoclonal antibodies
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Untersuchungen zur Rolle von Cyclin E1 in der Zellzykluskontrolle muriner Hepatozyten
Creators: name: Zschemisch, Nils-Holger
Publisher: name: Hannover : Universität
Year: 2004
Subjects: subject: Hepatocytes
subject: cyclin E1
subject: knockout
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
Aspects of 3d N=2 Chern-Simons-Matter Theories
Creators: name: Intriligator, Kenneth
name: Seiberg, Nathan
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We comment on various aspects of the the dynamics of 3d N=2 Chern-Simons gauge theories and their possible phases. Depending on the matter content, real masses and FI parameters, there can be non-compact Higgs or Coulomb branches, compact Higgs or Coulomb branches, and isolated vacua. We compute the Witten index of the theories, and show that it does not change when the system undergoes a phase transition. We study aspects of monopole operators and solitons in these theories, and clarify subtleties in the soliton collective coordinate quantization. We show that solitons are compatible with a mirror symmetry exchange of Higgs and Coulomb branches, with BPS solitons on one branch related to the modulus of the other. Among other results, we show how to derive Aharony duality from Giveon-Kutasov duality.
description: 76 pages, 1 figure. v2: added references
Steuerung von Küstenschutzelementen an Tideflüssen als Grundlage für ein Hochwasser- und Risikomanagement
Creators: name: Spekker, Heiko
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2008
Subjects: subject: Steuerbare Küstenschutzelemente
subject: Hochwasser- und Risikomanagement
subject: Risikominderung
subject: Flutraumerweiterung an Tideflüssen
subject: Sperrwerk
subject: Entlastungspolder
subject: Weserästuar
subject: Mississippi-Delta
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::624 | Ingenieurbau und Umwelttechnik

description: [no abstract]
Dante's Divina Commedia: Spring Lecture 10 (Paradiso 1, 2)
Creators: name: Barolini, Teodolinda
Publisher: name: Columbia University
Year: 2016
Subjects: Italian literature

description: Spring Lecture 10 of the course "Dante's Divina Commedia" taught by Teodolinda Barolini, Lorenzo da Ponte Professor of Italian at Columbia University. This iteration of her year-long Dante course was taught in two-hour, twice-weekly sessions during Fall 2015 and Spring 2016 (Dante’s Divina Commedia, Italian W4091 & W4092). Recorded February 18, 2016. 0:00 – introduction to Paradiso; sections in Paradiso 1-2 27:00 – Paradiso 1 1:36:25 – Paradiso 2
Wärmeübergang bei der Verdampfung von Ammoniak in Plattenwärmeübertragern
Creators: name: André, Matthias
Publisher: name: Hannover : Universität
Year: 2004
Subjects: subject: Plate heat exchanger
subject: evaporation
subject: ammonia
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: [no abstract]
Do medical students want to be taught teaching skills?
Creators: name: Fall, Edward
name: Halmey, Reanna
name: Parkinson, Eleanor
name: Jerica Kuah
name: Wasty, Tal
Publisher: name: F1000 Research Limited
Year: 2024

description: Background - One of the General Medical Council’s (GMC) outcomes for graduates is to serve as a mentor and teacher to peers. Currently, teaching skills are not mandatory in the curriculum of certain UK medical schools. This study aimed to collect medical students' perspectives on being taught teaching

skills as part of their degree.



Summary of work - A questionnaire was developed and distributed to medical students at the University of Manchester Medical School. The questions focused on students' understanding of the GMC's teaching expectations, as well as their own teaching confidence, previous teaching skills training, and if they would like teaching skills to be integrated into the undergraduate curriculum.



Summary of results - Out of the 97 participants, most (82.5%) expressed an awareness about the GMC requirement to teach medical students, with the large majority (96.9%) believing it to be important to develop teaching skills. However, very few students reported receiving adequate training in developing

their teaching skills (4.1%), with a large portion (40.2%) feeling unconfident in their teaching skills. The majority of participants (90.7%) expressed that they felt lessons in developing teaching skills should be

included in the Manchester curriculum, with more than half of that cohort (54.5%) feeling it should be a mandatory module.



Discussion and conclusion - Though most medical students in the University of Manchester are aware of the GMC’s teaching expectations and the importance of developing teaching skills, many feel they have not received adequate support in this domain. Despite the demand for integration of education on teaching into the curriculum, further research is required to determine how best to implement teaching skills training into the undergraduate degree.



Take home message - Medical students have a desire to learn teaching skills, but formal opportunities to do this are lacking. Medical schools should make attempts to integrate teaching skills into the undergraduate curriculum.
Untersuchung zur Anwendung von Biopolymeren und deren Derivaten in der Zellkultur und im Tissue Engineering
Creators: name: Stark, Yvonne
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2008
Subjects: subject: Biomaterials
subject: colominic acid
subject: Tissue engineering
subject: Biomaterialien
subject: Colominsäure
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Dante's Divina Commedia: Spring Lecture 09 (Purgatorio 31, 32, 33)
Creators: name: Barolini, Teodolinda
Publisher: name: Columbia University
Year: 2016
Subjects: Italian literature

description: Spring Lecture 9 of the course "Dante's Divina Commedia" taught by Teodolinda Barolini, Lorenzo da Ponte Professor of Italian at Columbia University. This iteration of her year-long Dante course was taught in two-hour, twice-weekly sessions during Fall 2015 and Spring 2016 (Dante’s Divina Commedia, Italian W4091 & W4092). Recorded February 16, 2016. 0:00 – use of Augustine in Purgatorio; Dante’s use of allegory; Purgatorio 31-32 26:25 – Purgatorio 31 47:36 – Purgatorio 32 1:20:49 – Purgatorio 33
First results from a next-generation off-plane X-ray diffraction grating
Creators: name: McEntaffer, Randall
name: DeRoo, Casey
name: Schultz, Ted
name: Gantner, Brennan
name: Tutt, James
name: Holland, Andrew
name: O'Dell, Stephen
name: Gaskin, Jessica
name: Kolodziejczak, Jeffrey
name: Zhang, William W.
name: Chan, Kai-Wing
name: Biskach, Michael
name: McClelland, Ryan
name: Iazikov, Dmitri
name: Wang, Xinpeng
name: Koecher, Larry
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Future NASA X-ray spectroscopy missions will require high throughput, high resolution grating spectrometers. Off-plane reflection gratings are capable of meeting the performance requirements needed to realize the scientific goals of these missions. We have identified a novel grating fabrication method that utilizes common lithographic and microfabrication techniques to produce the high fidelity groove profile necessary to achieve this performance. Application of this process has produced an initial pre-master that exhibits a radial (variable line spacing along the groove dimension), high density (>6000 grooves/mm), laminar profile. This pre-master has been tested for diffraction efficiency at the BESSY II synchrotron light facility and diffracts up to 55% of incident light into usable spectral orders. Furthermore, tests of spectral resolving power show that these gratings are capable of obtaining resolutions well above 1300 ($λ/Δλ$) with limitations due to the test apparatus, not the gratings. Obtaining these results has provided confidence that this fabrication process is capable of producing off-plane reflection gratings for the next generation of X-ray observatories.
description: 17 pages, 10 figures, Submitted to Experimetal Astronomy
Nachweis eines mononuclearen Mangan (II)-Zentrums in der Ribonucleotid-Reduktase aus Corynebacterium ammoniagenes ATCC 6872 nach Überexpression des den Metallocofaktor codierenden nrdF-Gens im Originalstamm
Creators: name: Barckhausen, Olaf
Publisher: name: Hannover : Universität
Year: 2004
Subjects: subject: Ribonucleotide reductase
subject: manganese
subject: Corynebacterium ammoniagenes
subject: homologous overexpression
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
Kepler observations of rapid optical variability in the BL Lac object W2R1926+42
Creators: name: Edelson, R.
name: Mushotzky, R.
name: Vaughan, S.
name: Scargle, J.
name: Gandhi, P.
name: Malkan, M.
name: Baumgartner, W.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present the first Kepler monitoring of a strongly variable BL Lac, W2R1926+42. The light curve covers 181 days with ~0.2% errors, 30 minute sampling and >90% duty cycle, showing numerous delta I/I > 25% flares over timescales as short as a day. The flux distribution is highly skewed and non-Gaussian. The variability shows a strong rms-flux correlation with the clearest evidence to date for non-linearity in this relation. We introduce a method to measure periodograms from the discrete autocorrelation function, an approach that may be well-suited to a wide range of Kepler data. The periodogram is not consistent with a simple power-law, but shows a flattening at frequencies below 7x10-5 Hz. Simple models of the power spectrum, such as a broken power law, do not produce acceptable fits, indicating that the Kepler blazar light curve requires more sophisticated mathematical and physical descriptions than currently in use.
description: 12 pages, 7 figures, accepted for publication in ApJ, 2013 March 20 edition
Campanula cervicaria L.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: C. Cervicaria L. Cat. 248. FürdasWalliszweifelhafteArt. Dieeinzige,auf D'ANGREVILLEzurückgehendeAngabe (Daviaz ob Massongex) ist niebestätigtworden.
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Near-Infrared Detection of a Super-Thin Disk in NGC 891
Creators: name: Schechtman-Rook, Andrew
name: Bershady, Matthew A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We probe the disk structure of the nearby, massive, edge-on spiral galaxy NGC 891 with sub-arcsecond resolution JHKs-band images covering ~+/-10 kpc in radius and +/-5 kpc in height. We measure intrinsic surface brightness profiles using realistic attenuation corrections constrained from near- and mid-infrared (Spitzer) color maps and three-dimensional Monte-Carlo radiative-transfer models. In addition to the well-known thin and thick disks, a super-thin disk with 60-80 pc scale-height - comparable to the star-forming disk of the Milky Way - is visibly evident and required to fit the attenuation-corrected light distribution. Asymmetries in the super-thin disk light profile are indicative of young, hot stars producing regions of excess luminosity and bluer (attenuation-corrected) near-infrared color. To fit the inner regions of NGC 891, these disks must be truncated within ~3 kpc, with almost all their luminosity redistributed in a bar-like structure 50% thicker than the thin disk. There appears to be no classical bulge but rather a nuclear continuation of the super-thin disk. The super-thin, thin, thick, and bar components contribute roughly 30%, 42%, 13%, and 15% (respectively) to the total Ks-band luminosity. Disk axial ratios (length/height) decrease from 30 to 3 from super-thin to thick components. Both exponential and sech^2 vertical SB profiles fit the data equally well. We find that the super-thin disk is significantly brighter in the Ks-band than typically assumed in integrated SED models of NGC 891: it appears that in these models the excess flux, likely produced by young stars in the super-thin disk, has been mistakenly attributed to the thin disk.
description: 32 pages, 22 figures, accepted for publication in ApJ
Verfahrensentwicklung und theoretische Betrachtungen zum lasergestützten 3D-Mikro-Auftragschweißen
Creators: name: Becker, Hinrich
Publisher: name: Hannover : Universität
Year: 2004
Subjects: subject: Rapid prototyping
subject: micro cladding
subject: particle focusing
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: [no abstract]
Dante's Divina Commedia: Spring Lecture 08 (Purgatorio 29, 30, 31)
Creators: name: Barolini, Teodolinda
Publisher: name: Columbia University
Year: 2016
Subjects: Italian literature

description: Spring Lecture 8 of the course "Dante's Divina Commedia" taught by Teodolinda Barolini, Lorenzo da Ponte Professor of Italian at Columbia University. This iteration of her year-long Dante course was taught in two-hour, twice-weekly sessions during Fall 2015 and Spring 2016 (Dante’s Divina Commedia, Italian W4091 & W4092). Recorded February 11, 2016. 0:00 – overview anticipating Beatrice’s rebuke 20:07 – Purgatorio 29 end 29:37 – Purgatorio 30 1:13:57 – Purgatorio 31
Geometric properties of rotation minimizing vector fields along curves in Riemannian manifolds
Creators: name: Etayo, Fernando
Publisher: name: arXiv
Year: 2016
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53B20, 53A04, 53A05, 53A35

description: Rotation minimizing vector fields and frames were introduced by Bishop as an alternative to the Frenet frame. They are used in CAGD because they can be defined even the curvature vanishes. Nevertheless, many other geometric properties have not been studied. In the present paper, RM vector fields along a curve immersed into a Riemannian manifold are studied when the ambient manifold is the Euclidean 3-space, the Hyperbolic 3-space and a Kähler manifold.
description: To appear in Turkish Journal of Mathematics
The XMM-Newton deep survey in the Chandra Deep Field South. III. Point source catalogue and number counts in the hard X-rays
Creators: name: Ranalli, P.
name: Comastri, A.
name: Vignali, C.
name: Carrera, F. J.
name: Cappelluti, N.
name: Gilli, R.
name: Puccetti, S.
name: Brandt, W. N.
name: Brunner, H.
name: Brusa, M.
name: Georgantopoulos, I.
name: Iwasawa, K.
name: Mainieri, V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: (abridged) The XMM-Newton survey in the Chandra Deep Field South (XMM-CDFS) aims at detecting and studying the spectral properties of a significant number of obscured and Compton-thick AGN. The large effective area of XMMin the 2--10 and 5--10 keV bands, coupled with a 3.45 Ms nominal exposure time, allows us to build clean samples in both bands, and makes the XMM-CDFS the deepest XMM survey currently published in the 5--10 keV band. The large multi-wavelength and spectroscopic coverage of the CDFS area allows for an immediate and abundant scientific return. We present the data reduction of the XMM-CDFS observations, the method for source detection in the 2--10 and 5--10keV bands, and the resulting catalogues. A number of 339 and 137 sources are listed in the above bands with flux limits of 6.6e-16 and 9.5e-16 erg/s/cm^2, respectively. The flux limits at 50% of the maximum sky coverage are 1.8e-15 and 4.0e-15 erg/s/cm^2, respectively. The catalogues have been cross-correlated with the Chandra ones: 315 and 130 identifications have been found with a likelihood-ratio method, respectively. A number of 15 new sources, previously undetected by Chandra, is found; 5 of them lie in the 4 Ms area. Redshifts, either spectroscopic or photometric, are available for ~92% of the sources. The number counts in both bands are presented and compared to other works. The survey coverage has been calculated with the help of two extensive sets of simulations, one set per band. The simulations have been produced with a newly-developed simulator, written with the aim of the most careful reproduction of the background spatial properties. We present a detailed decomposition of the XMM background into its components: cosmic, particle, and residual soft protons.
description: Accepted by A&A. 23 pages, 15 figures. Some figures were degraded to match size constraints. The catalogue files and the simulator will appear shortly at the XMM-CDFS website: http://www.bo.astro.it/xmmcdfs/deeprime
Vergleichende limnologische Untersuchung zur Planktondynamik von flussnahen Abgrabungsgewässern in der niedersächsischen Weser- und Leineaue
Creators: name: Blöchl, Armin
Publisher: name: Hannover : Universität
Year: 2004
Subjects: subject: Gravel pit lakes
subject: river floodplains
subject: plankton
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
Die Bedeutung der Anaphylatoxine C3a und C5a im Mausmodell der allergischen Atemwegsentzündung
Creators: name: Bälder, Ralf
Publisher: name: Hannover : Universität
Year: 2004
Subjects: subject: Anaphylatoxins
subject: asthma
subject: mouse
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Better Trees: An empirical study on hyperparameter tuning of classification decision tree induction algorithms
Creators: name: Mantovani, Rafael Gomes
name: Horváth, Tomáš
name: Rossi, André L. D.
name: Cerri, Ricardo
name: Junior, Sylvio Barbon
name: Vanschoren, Joaquin
name: de Carvalho, André Carlos Ponce de Leon Ferreira
Publisher: name: arXiv
Year: 2018
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Machine learning algorithms often contain many hyperparameters (HPs) whose values affect the predictive performance of the induced models in intricate ways. Due to the high number of possibilities for these HP configurations and their complex interactions, it is common to use optimization techniques to find settings that lead to high predictive performance. However, insights into efficiently exploring this vast space of configurations and dealing with the trade-off between predictive and runtime performance remain challenging. Furthermore, there are cases where the default HPs fit the suitable configuration. Additionally, for many reasons, including model validation and attendance to new legislation, there is an increasing interest in interpretable models, such as those created by the Decision Tree (DT) induction algorithms. This paper provides a comprehensive approach for investigating the effects of hyperparameter tuning for the two DT induction algorithms most often used, CART and C4.5. DT induction algorithms present high predictive performance and interpretable classification models, though many HPs need to be adjusted. Experiments were carried out with different tuning strategies to induce models and to evaluate HPs' relevance using 94 classification datasets from OpenML. The experimental results point out that different HP profiles for the tuning of each algorithm provide statistically significant improvements in most of the datasets for CART, but only in one-third for C4.5. Although different algorithms may present different tuning scenarios, the tuning techniques generally required few evaluations to find accurate solutions. Furthermore, the best technique for all the algorithms was the IRACE. Finally, we found out that tuning a specific small subset of HPs is a good alternative for achieving optimal predictive performance.
description: 60 pages, 16 figures
Feedback control of optical beam spatial profiles using thermal lensing
Creators: name: Liu, Zhanwei
name: Fulda, Paul
name: Arain, Muzammil A.
name: Williams, Luke
name: Mueller, Guido
name: Tanner, David B.
name: Reitze, David H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A method for active control of the spatial profile of a laser beam using adaptive thermal lensing is described. A segmented electrical heater was used to generate thermal gradients across a transmissive optical element, resulting in a controllable thermal lens. The segmented heater also allows the generation of cylindrical lenses, and provides the capability to steer the beam in both horizontal and vertical planes. Using this device as an actuator, a feedback control loop was developed to stabilize the beam size and position.
description: 7 Pages, 7 figures
Simulation of hydrogen diffusion and boron passivation in crystalline silicon
Creators: name: Velichko, O. I.
name: Shaman, Yu. P.
name: Kovaliova, A. P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The model of hydrogen migration and of the reactions of hydrogen atoms with electrically active impurity, developed earlier, has been applied to simulate hydrogen diffusion and passivation process during plasma deuteration of silicon substrates doped with boron. The calculated deuterium concentration profiles agree well in the length of the passivated region with the experimental data obtained on treatment in hydrogen plasma at a temperature of 200 Celsius degrees for 5, 10, and 15 minutes. On the other hand, to achieve a good fit to the abruptness of the calculated profiles between the passivated and unpassivated regions, it is necessary to suppose that the values of the parameters that describe the absorption of hydrogen interstitials by electrically active dopant atoms decrease with increase in the depth of the passivated region. For example, nonuniform spatial distributions of nonequilibrium point defects generated during plasma treatment can lead to a spatial dependence of hydrogen absorption.
description: 10 pages, 5 figures
H2 Excitation Structure on the Sightlines to delta Scorpius and zeta Ophiucus - First Results from the Sub-orbital Local Interstellar Cloud Experiment
Creators: name: France, Kevin
name: Nell, Nicholas
name: Kane, Robert
name: Burgh, Eric B.
name: Beasley, Matthew
name: Green, James C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the first science results from the Sub-orbital Local Interstellar Cloud Experiment (SLICE): moderate resolution 1020-1070A spectroscopy of four sightlines through the local interstellar medium. High signal-to-noise (S/N) spectra of eta Uma, alpha Vir, delta Sco, and zeta Oph were obtained during a 21 April 2013 rocket flight. The SLICE observations constrain the density, molecular photoexcitation rates, and physical conditions present in the interstellar material towards delta Sco and zeta Oph. Our spectra indicate a factor of two lower total N(H2) than previously reported for delta Sco, which we attribute to higher S/N and better scattered light control in the new SLICE observations. We find N(H2) = 1.5 x 10^{19} cm^{-2} on the delta Sco sightline, with kinetic and excitation temperatures of 67 and 529 K, respectively, and a cloud density of n_{H} = 56 cm^{-3}. Our observations of the bulk of the molecular sightline toward zeta Oph are consistent with previous measurements (N(H2) ~ 3 x 10^{20} cm^{-2} at T_{01} = 66 K and T_{exc} = 350 K). However, we detect significantly more rotationally excited H2 towards zeta Oph than previously observed. We infer a cloud density in the rotationally excited component of n_{H} ~ 7600 cm^{-3} and suggest that the increased column densities of excited H2 are a result of the ongoing interaction between zeta Oph and its environment; also manifest as the prominent mid-IR bowshock observed by WISE and the presence of vibrationally-excited H2 molecules observed by HST.
description: 6 pages, 4 figures, 1 table. ApJL - accepted
Die Amerikanisierung Amerikas : Thorstein Veblens amerikanische Weltgeschichte
Creators: name: Truninger, Stephan
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2008
Subjects: subject: Amerikanisierung
subject: melting pot
subject: Thorstein Veblen
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie

description: [no abstract]
Nature of the gas and dust around 51 Oph
Creators: name: Thi, W. F.
name: Ménard, F.
name: Meeus, G.
name: Carmona, A.
name: Riviere-Marichalar, P.
name: Augereau, J. -C.
name: Kamp, I.
name: Woitke, P.
name: Pinte, C.
name: Mendigutía, I.
name: Eiroa, C.
name: Montesinos, B.
name: Britain, S.
name: Dent, W.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Circumstellar disc evolution is paramount for the understanding of planet formation. The GASPS program aims at determining the circumstellar gas and solid mass around ~250 pre-main-sequence Herbig Ae and TTauri stars. We aim to understand the origin and nature of the circumstellar matter orbiting 51 Oph, a young (<1 Myr) luminous B9.5 star. We obtained continuum and line observations with the PACS instrument on board the Herschel Space Observatory and continuum data at 1.2 mm with the IRAM 30m telescope. The SED and line fluxes were modelled using the physico-chemo radiative transfer code ProDiMo. We detected a strong emission by OI at 63 microns using the Herschel Space Observatory. The [OI] emission at 145 microns, the [CII] emission at 158 microns, the high-J CO emissions, and the warm water emissions were not detected. Continuum emission was detected at 1.2 mm. The continuum from the near- to the far-infrared and the [OI] emission are well explained by the emission from a compact hydrostatic disc model with a gas mass of 5E-6 MSun, 100 times that of the solid mass. However, this model fails to match the continuum millimeter flux, which hints at a cold outer disc with a mass in solids of 1E-6 MSun or free-free emission from a photoevaporative disc wind. This outer disc can either be devoid of gas and/or is to cold to emit in the [OI] line. A very flat extended disc model (Rout=400 AU) with a fixed vertical structure and dust settling matches all photometric points and most of the [O I] flux. The observations can be explained by an extended flat disc where dust grains have settled. However, a flat gas disc cannot be reproduced by hydrostatic disc models. The low mass of the 51 Oph inner disc in gas and dust may be explained either by the fast dissipation of an initial massive disc or by a very small initial disc mass.
description: accepted to A&A
Beurteilung des Einflusses einer angepassten Ackernutzung auf den Hochwasserabfluss
Creators: name: Akkermann, Matthias
Publisher: name: Hannover : Universität
Year: 2004
Subjects: subject: Flood control
subject: soil conservation
subject: runoff
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin

description: [no abstract]
Conditions for plasma evolution to the\ strong general Woltjer-Taylor state
Creators: name: Chen, Jun-hua
name: Fan, Hong-yi
Publisher: name: arXiv
Year: 2012
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We find that the proof in the recent paper$\textsuperscript{\cite{14}}$ can not justify the authors' conclusion. We provide a real proof that any state will eventually evolves to the Woltjer-Taylor state exponentially. However, this kind of evolution is is mainly due to Joule heat, which also makes the magnetic field vanishes exponentially. Zero Woltjer-Taylor states are not physically attractive. Instead of examine $Δ$, we introduce the quantity $θ_{\nabla \times \vec{B},\vec{B}}$ and $R$ to examine if the plasma reaches to the strong (general) Woltjer-Taylor state, and then derive the condition for the evolution to the strong/general Woltjer-Taylor state.
Entwicklung und Austestung kardiomyozyten- bzw. pneumozytenspezifischer lentiviraler Vektoren für die Anwendung in embryonalen Stammzellen
Creators: name: Wunderlich, Stephanie
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2008
Subjects: subject: Lentivirale Vektoren
subject: zelltypspezifische Transgenexpression
subject: embryonale Stammzellen
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Realisierung erster quantenentarteter Gase unter Schwerelosigkeit
Creators: name: Van Zoest, Tim
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2008
Subjects: subject: Bose-Einstein-Kondensation
subject: Schwerelosigkeit
subject: Fallturm
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Optimierung der Quelle-Ziel-Matrixschätzung hinsichtlich Redundanzstörung sich verändernder Verkehrszustände
Creators: name: Wang, Yun-Pang
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2008
Subjects: subject: Matrixschätzung
subject: redundante Information
subject: Verkehrsumlegung
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::380 | Handel, Kommunikation, Verkehr

description: [no abstract]