170,024 research outputs found
wind n - 3
No full textwindtwelve-volt generators were mounted where they would catch the most wind. Some people placed them on the house top, others on the roof of a nearby shed and others on a twenty-five foot wooden tower in the yard. The windcharger spun around in the breeze and pumped two twelve-volt car batteries in the kitchen full of juice. _wind hound_: bright gleam in vicinity of the sun thought to presage a storm (C 70-26 E Shortall) ; SUN HOUND. _wind-jack_: Length of wood with moveable blade at one end which rotates when carried as a child's toy and indicates velocity of wind when fastened to a post.Used I and SupUsed I and Sup2Used Iwind-bag, windbag, wind-charger, windchargers, windcharger, wind gall,wind galls, wind hound, SUN HOUND, wind-jack, windjack,wind light, WEATHER LIGHT, wind lop, lop, tumblewhite out under n -
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
The effect of the elastic modulus of endodontic posts on static load failure.
No full textStewardson DA, Shortall AC, Marquis PM. The effect of the elastic modulus of endodontic posts on static load failure. International Endodontic Journal, 44, 458-468, 2011. ABSTRACT: Aim To compare posts of different flexibility using static load testing. Hypotheses tested were (1) the flexural modulus of endodontic posts does not show a linear relationship with failure load and (2) the flexural modulus of endodontic posts does not show an association with failure mode. Methodology Thirty 2 mm diameter rods of a glass fibre material Aesthetiplus (A), a carbon fibre Composipost (C) and stainless steel (S) were cemented into 90 roots of extracted human teeth using resin cement. Composite resin cores were added and the roots embedded in self-curing acrylic resin. Samples were loaded at 90° in a universal testing machine until failure. Failure loads and fracture levels were compared using one-way anova and post-hoc Scheffé tests. Proportions of different failure modes were compared with Chi square tests (α = 0.05). Results Mean failure loads - MPa (SD) were A - 278.69 (85.79), C - 258.86 (82.05), S - 347.37 (74.50). There was no significant difference in the mean failure load of roots containing the FRC posts (P = 0.639), but it was significantly greater for steel post samples (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
Large‐scale migration synchrony between parasitoids and their host
No full text1. Parasitoids are a valuable group for conservation biological control. In their role as regulators of aphid pests, it is critical that their lifecycle is synchronised with their hosts in both space and time. This is because a synchronised parasitoid community is more likely to strengthen the overall conservation biological control effect, thus damping aphid numbers and preventing potential outbreaks. One component of this host–parasitoid system was examined, that of migration, and the hypothesis that peak summer parasitoid and host migrations are synchronised in time was tested.2. Sitobion avenae Fabricius and six associated parasitoids were sampled from 1976 to 2013 using 12.2-m suction-traps from two sites in Southern England. The relationship between peak weekly S. avenae counts and their parasitoids was quantified.3. Simple regression models showed that the response of the peak parasitoids to the host was positive: generally, more parasitoids migrated with increasing numbers of aphids. Further, when averaged over time, the parasitoid migration peak date corresponded with the aphid migration peak. The co-occurrence of the peaks was between 51% and 64%. However, the summer peak in aphid migration is not steadily shifting forward with time unlike spring first flights of aphids. Cross-correlation analysis showed that there were no between-year lagged effects of aphids on parasitoids.4. These results demonstrate that the peak in migration phenology between host and parasitoid is broadly synchronised within a season. Because the threshold temperature for flight (> 12 °C) was almost always exceeded in summer, the synchronising agent is likely to be crop senescence, not temperature. Studies are needed to assess the effects of climate change on the mismatch potential between parasitoids and their hosts
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
Enzyme immobilization on metal organic frameworks: Laccase from Aspergillus sp. is better adapted to ZIF-zni rather than Fe-BTC
No full textLaccase from Aspergillus sp. (LC) was immobilized within Fe-BTC and ZIF-zni metal organic frameworks through a one-pot synthesis carried out under mild conditions (room temperature and aqueous solution). The Fe-BTC, ZIF-zni MOFs, and the LC@Fe-BTC, LC@ZIF-zni immobilized LC samples were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The kinetic parameters (KM and Vmax) and the specific activity of the free and immobilized laccase were determined. Immobilized LCs resulted in a lower specific activity compared with that of the free LC (7.7 μmol min-1 mg-1). However, LC@ZIF-zni was almost 10 times more active than LC@Fe-BTC (1.32 μmol min-1 mg-1 vs 0.17 μmol min-1 mg-1) and only 5.8 times less active than free LC. The effect of enzyme loading showed that LC@Fe-BTC had an optimal loading of 45.2 mg g-1, at higher enzyme loadings the specific activity decreased. In contrast, the specific activity of LC@ZIF-zni increased linearly over the loading range investigated. The storage stability of LC@Fe-BTC was low with a significant decrease in activity after 5 days, while LC@ZIF retained up to 50% of its original activity after 30 days storage. The difference in activity and stability between LC@Fe-BTC and LC@ZIF-zni is likely due to release of Fe3+ and the low stability of Fe-BTC MOF. Together, these results indicate that ZIF-zni is a superior support for the immobilization of laccase
The Insect Crisis
No full textBook Review
Oliver Milman Atlantic Books 2022ISBN: 9781838951177
Reviewed by Chris Shortall
I can’t say I enjoyed this book much. But then any book that lays out in such stark detail the perils facing our insect fauna, and by extension ourselves, cannot be an enjoyable read no matter how well written it is. And this book is very well-written; the language and pacing are such that its chapters can be devoured in short sittings, only with breaks needed to contemplate the horror unfolding in the pages.
The author does take time to outline the perils of alarmism in this context. Chris Thomas is quoted with the concern that “…if people say, ‘insects are declining by 70 percent’ and then it turns out they are only declining by 20%, and everyone says, ‘Oh. Well, that’s alright then’” and there is a somewhat dismissive nod to the notion that more research is needed, especially in areas where we don’t have data. That cautionary note done with, we then get a steady drumbeat of insect doom with the central pair of chapters ‘The Peak of the Pesticide’ and ‘In the Teeth of the Climate Emergency’ and two further chapters, case studies on bees and butterflies — the charismatic microfauna, laying the blame for the crisis squarely at the feet of agriculture and fossil fuels.
The book is generally well-researched, although many Royal Entomological Society members will raise an eyebrow at the assertion that the Krefeld Entomology Society were “the only ones” making long-term standardised surveys of insects. I also found that the reference list contains many references to news reports on scientific papers rather than the papers themselves.
There are some seeds of hope sown through the crop of despair that Milman has cultivated here. In the penultimate chapter ‘The Inaction Plan’ it is noted how quickly insect populations have been seen to bounce back at the Knepp project and in roadside verges that lay unmown during the Covid pandemic. Even here the pessimism remains, as the need for allowing wild spaces for insects to thrive, or at the very least to survive, is placed against the need to feed a planet of 8–10 billion people and the pressure that places on our environment.
In summary, nothing in this book should be a surprise to the members of this Society. But then this book isn’t aimed at us. It is aimed at the general public with a view to opening their eyes to the crisis that is unfolding around them. I think it does that, but perhaps may go too far in ladling on the apocalyptic narrative — reading this book gave me no hope for the future and a sense that we are powerless to avert the impending catastrophe — and as such I would hesitate to recommend it
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
A 0.12mm<sup>2</sup> Wien-Bridge Temperature Sensor with 0.1°C (3σ) Inaccuracy from -40°C to 180°C
No full text Resistor-based temperature sensors can achieve much higher resolution and energy efficiency than conventional BJT-based sensors [1], but they typically occupy more area (> 0.25 mm 2 ) and have lower operating temperatures (le 125 {circ} {C}) [2]-[4]. This work describes a 0.12mm 2 resistor-based sensor that uses a Wien-bridge (WB) filter to achieve 0.1 {circ} {C} (3 sigma) inaccuracy from - 40 {circ} {C} to 180 {circ} {C}. Compared to a state-of-the-art WB sensor [4], it occupies 6 × less area and achieves comparable relative accuracy over a 76% wider operating range. Session 10.3 Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
- …
