169,968 research outputs found
Jandl-Stevenson Collection
No full textH. Ward Jandl and Katherine C. Stevenson were both architectural historians who collaborated to compile research data involving the Sears, Roebuck and Company mail-order house designs prevalent in the first half of the twentieth century. The collections include correspondence, research notes, photographs, and negatives relating to the research and production of their book Houses by Mail (Preservation Press, 1986), which serves as a guide to the homes manufactured and sold by Sears, Roebuck and Company from 1908 to 1940. The designs and materials for approximately 450 houses were featured in the company's mail-order catalogs, which the authors bring to light in their informative book
C−C Cross-Couplings from a Cyclometalated Au(III) C∧ N Complex: Mechanistic Insights and Synthetic Developments
Get PDFIn recent years, the reactivity of gold complexes was shown to extend well beyond π-activation and to hold promises to achieve selective cross-couplings in several C−C and C−E (E=heteroatom) bond forming reactions. Here, with the aim of exploiting new organometallic species for cross-coupling reactions, we report on the Au(III)-mediated C(sp2)−C(sp) occurring upon reaction of the cyclometalated complex [Au(CCH2N)Cl2] (1, CCH2N=2-benzylpyridine) with AgPhCC. The reaction progress has been monitored by NMR spectroscopy, demonstrating the involvement of a number of key intermediates, whose structures have been unambiguously ascertained through 1D and 2D NMR analyses (1H, 13C, 1H-1H COSY, 1H-13C HSQC and 1H-13C HMBC) as well as by HR-ESI-MS and X-ray diffraction studies. Furthermore, crystallographic studies have serendipitously resulted in the authentication of zwitterionic Au(I) complexes as side-products arising from cyclization of the coupling product in the coordination sphere of gold. The experimental work has been paralleled and complemented by DFT calculations of the reaction profiles, providing valuable insight into the structure and energetics of the key intermediates and transition states, as well as on the coordination sphere of gold along the whole process. Of note, the broader scope of the cross-coupling at the Au(III) CCH2N centre has also been demonstrated studying the reaction of 1 with C(sp2)-based nucleophiles, namely vinyl and heteroaryl tin and zinc reagents. These reactions stand as rare examples of C(sp2)−C(sp2) cross-couplings at Au(III)
Terpyridine Diphosphine Ruthenium Complexes as Efficient Photocatalysts for the Transfer Hydrogenation of Carbonyl Compounds
Get PDFAnalysis of the Importance of SMART Therapy in the German Asthma Network
No full textHinze C, Ehmann R, Jandl M, et al. Analyse des Stellenwertes der SMART Therapie im German Asthma Network. Pneumologie . 2024;78(Suppl. 1):S5
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Kapitel 5. Mitigation des Klimawandels
Get PDFAufgrund der Größe der betroffenen Landflächen, den bei ihrer Nutzung emittierten und sequestrierten Treibhausgasen (THG) und des teilweise ungünstigen Zustands von Böden in Hinblick auf ihren Gehalt an organisch gebundenem Kohlenstoff (C) kommt der Landnutzung a priori eine wichtige Rolle bei Mitigationsbemühungen zu. Zur Minderung des Klimawandels ist eine Verringerung der atmosphärischen CO2-Konzentration erforderlich, die durch eine Abnahme der THG-Emissionen und durch Aufnahme und langfristige Speicherung von atmosphärischem Kohlenstoff in Biomasse und Boden erreicht werden kann (Chenu et al., 2019; Mayer et al., 2018; Paustian et al., 2016; Vos et al., 2018). Der Erhaltung bzw. idealerweise Erhöhung der organischen Substanz des Bodens durch geeignete Bodenschutzmaßnahmen kommt entscheidende Bedeutung zu
Cooperative emission study in ytterbium doped NdVO4
No full textThe infrared and visible cooperative emissions of ytterbium ions are studied in Yb-doped NdVO4 single crystals. The absorption of optical phonons allows the emissions at room temperature when a Nd:YAG laser is used. Low temperature emissions are observed due to the Nd3+ -> Yb3+ energy transfer following an argon ion laser excitation of the Nd3+ ions. Analysis of the cooperative emission at low doping concentration (1%) indicates that it is generated by distant pair forming Yb3+ ions while at high doping concentration (>= 5%) close ions magnetically coupled and superexchange mechanisms prevail in the emitting process. (C) 2011 Elsevier B.V. All rights reserved
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
Get PDFWe 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
Phase equilibria and structural investigations of the general NiAs-type in the ternary system Ni-Sn-Te
No full textThe ternary system NieSneTe was investigated by means of light optical microscopy (LOM), powder Xray
diffraction (XRD), differential thermal analysis (DTA) and scanning electron microscopy (SEM) in
combination with energy dispersive X-ray spectroscopy (EDX). Two isothermal sections at 600 and
800 C were investigated experimentally. The two ternary compounds, Ni5.78SnTe2 (space group I4/mmm,
Pearson symbol tI18) and Ni3xSnTe2 (space group P63/mmc, Pearson symbol hP12), already known from
literature, were confirmed, although Ni3xSnTe2 was found only at 600 C. At higher temperatures a
continuous phase field of the general NiAs-type structure was discovered between NiTe2x and Ni3Sn2
HT. It ranges continuously from 34 to 63 at.% Ni, covering CdI2-types, as well as Ni2In-type domains; thus
a continuous transition from the CdI2 to Ni2In type is confirmed, to the best of our knowledge, for the first
time. Lattice parameter variations and the transition CdI2eNiAseNi2In in the ternary phase field were
analysed.
Furthermore, vertical sections at 10, 40, 55, 60 and 70 at.% Ni were determined. A liquidus surface
projection and a reaction scheme of the system were constructed as well. Altogether, 17 invariant phase
reactions, including 3 eutectic reactions, 2 peritectic reactions, 11 transition reactions and one maximum
were discovered
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