170,681 research outputs found
Annette von Droste [microform] : ein Lebensbild /
No full textMaster Negative No. 95-3802.Filmed with: Gedichte / Annette von Droste-Hülshoff.Microfilm.Mode of access: Internet
Countable 1-transitive trees
No full textWe give a survey of three pieces of work, on 2-transitive trees (Droste, Memoirs Am Math Soc 57(334) 1985), on weakly 2-transitive trees (Droste et al., Proc Lond Math Soc 58:454–494, 1989), and on lower 1-transitive linear orders (Barbina and Chicot, Towards a classification of the countable 1-transitive trees: countable lower 1-transitive linear orders. arXiv:1504.03372), all in the countable case. We lead on from these to give a complete description of all the countable 1-transitive trees. In fact the work of Barbina and Chicot (Towards a classification of the countable 1-transitive trees: countable lower 1-transitive linear orders. arXiv:1504.03372) was carried out as a preliminary to finding such a description. This is because the maximal chains in any 1-transitive tree are easily seen to be lower 1-transitive, but are not necessarily 1-transitive. In fact a more involved set-up has to be considered, namely a coloured version of the same situation (where ‘colours’ correspond to various types of ramification point), so a major part of what we do here is to describe a large class of countable coloured lower 1-transitive linear orders and go on to use this to complete the description of all countable 1-transitive trees. This final stage involves analysing how the possible coloured branches can fit together, with particular attention to the possibilities for cones at ramification points
Droste-Hülshoff, Annette von - Porträt
No full textDROSTE-HÜLSHOFF, ANNETTE VON - PORTRÄT
Droste-Hülshoff, Annette von - Porträt ( -
Weighted omega-Restricted One Counter Automata
No full textLet be a complete star-omega semiring and be an alphabet. For a
weighted -restricted one-counter automaton with set of
states , , we show that there exists a mixed
algebraic system over a complete semiring-semimodule pair such that the behavior
of is a component of a solution of this
system. In case the basic semiring is or we
show that there exists a mixed context-free grammar that generates
. The construction of the mixed context-free grammar
from is a generalization of the well-known triple construction in
case of restricted one-counter automata and is called now triple-pair
construction for -restricted one-counter automata
Logical Characterizations of Weighted Complexity Classes
No full textFagin’s seminal result characterizing NP in terms of existential second-order logic started the fruitful field of descriptive complexity theory. In recent years, there has been much interest in the investigation of quantitative (weighted) models of computations. In this paper, we start the study of descriptive complexity based on weighted Turing machines over arbitrary semirings. We provide machine-independent characterizations (over ordered structures) of the weighted complexity classes NP[S], FP[S], FPLOG[S], FPSPACE[S], and FPSPACEpoly[S] in terms of definability in suitable weighted logics for an arbitrary semiring S. In particular, we prove weighted versions of Fagin’s theorem (even for arbitrary structures, not necessarily ordered, provided that the semiring is idempotent and commutative), the Immerman–Vardi’s theorem (originally for P) and the Abiteboul–Vianu–Vardi’s theorem (originally for PSPACE). We also discuss a recent open problem proposed by Eiter and Kiesel. Recently, the above mentioned weighted complexity classes have been investigated in connection to classical counting complexity classes. Furthermore, several classical counting complexity classes have been characterized in terms of particular weighted logics over the semiring N of natural numbers. In this work, we cover several of these classes and obtain new results for others such as NPMV, ⊕P, or the collection of real-valued languages realized by polynomial-time real-valued nondeterministic Turing machines. Furthermore, our results apply to classes based on many other important semirings, such as the max-plus and the min-plus semirings over the natural numbers which correspond to the classical classes MaxP[O(log n)] and MinP[O(log n)], respectively. © Guillermo Badia, Manfred Droste, Carles Noguera, and Erik Paul
Wo ist denn das Blumenkörbchen geblieben? Ein Versuch zu Annette von Droste-Hülshoff und Eduard Mörike
No full textBraungart W. Wo ist denn das Blumenkörbchen geblieben? Ein Versuch zu Annette von Droste-Hülshoff und Eduard Mörike. In: Blasberg C, Grywatsch J, eds. Droste-Jahrbuch 14, 2021/22. Hannover: Wehrhahn; 2023: 67-106
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
sj-docx-1-ult-10.1177_1742271X221095405 – Supplemental material for Bedside ultrasonography prior to abdominal paracentesis is associated with low complication and high success rate: Experience in a National Health Service District General Hospital in the United Kingdom from 2013 to 2019
No full textSupplemental material, sj-docx-1-ult-10.1177_1742271X221095405 for Bedside ultrasonography prior to abdominal paracentesis is associated with low complication and high success rate: Experience in a National Health Service District General Hospital in the United Kingdom from 2013 to 2019 by Jan C Droste, Christy Riggott, Tracey Maxfield and Anna Zoltowski in Ultrasound</p
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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