105,985 research outputs found
The introduction of an Automatic External Defibrillator (AED) System into Knutson Construction
No full textIncludes bibliographical references
Supporting data for Polymeric medical sutures: An exploration of polymers and green chemistry
No full textFull description in Readme file.These files contain data along with associated output from instrumentation supporting all results reported in Knutson, C. M.; Schneiderman, D. K.; Yu, M.; Javner, C. H.; Distefano, M. D.; Wissinger, J. E. Polymeric medical sutures: An exploration of polymers and green chemistry. J. Chem. Educ. 2017, 94, 1761–1765. In Knutson, et. al. it was found that with new K–12 national science standards emerging, there is an increased need for experiments that integrate engineering into the context of society. Here we describe a chemistry experiment that combines science and engineering principles while introducing basic polymer and green chemistry concepts. Using medical sutures as a platform for investigating polymers, students explore the physical and mechanical properties of threads drawn from poly(ε-caprolactone) samples of different molecular masses and actual purchased absorbable and nonabsorbable medical sutures. An inquiry-based part of the experiment tasks students with designing their own experiment to probe the potential of melt blending poly(ε-caprolactone) with commercially available polylactide products in order to modify the properties of the “sutures” drawn. Through these lessons students gain an appreciation for the importance of plastics in our society and how scientists are working to develop more sustainable alternatives. Overall, this laboratory experiment provides a feasible, versatile, sophisticated laboratory experience that engages students in a relatable topic and meets many of the Next Generation Science Standards.Minnesota Pollution Control Agency (Swift 52526)NSF CHE-1413862NSF RET DMR-1559833Knutson, Cassandra M; Schneiderman, Deborah K; Yu, Ming; Javner, Cassidy H; Distefano, Mark D; Wissinger, Jane E. (2018). Supporting data for Polymeric medical sutures: An exploration of polymers and green chemistry. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/D6F115
Toric surfaces with Kazhdan-Lusztig atlases
No full textA Kazhdan-Lusztig atlas, introduced by He, Knutson and Lu, on a stratified variety (V,Y) is a way of modeling the stratification Y of V locally using the stratification of Kazhdan-Lusztig varieties. We are interested in classifying smooth toric surfaces with Kazhdan-Lusztig atlases. This involves finding a degeneration of V to a union of Richardson varieties in the flag variety H/B_H of some Kac-Moody group H. We determine which toric surfaces have a chance at having a Kazhdan-Lusztig atlas by looking at their moment polytopes, then describe a way to find a suitable group H. More precisely, we find that (up to equivalence) there are 19 or 20 broken toric surfaces admitting simply-laced atlases, and that there are at most 7543 broken toric surfaces where H is any Kac-Moody group
Sepedon (Parasepedon) hispanica subsp. ruhengeriensis Verbeke 1950
No full textSepedon (Parasepedon) hispanica Loew ssp. ruhengeriensis Verbeke, 1950 Synonym by Verbeke (1964). (Figs 15, 17, 18, plate 9) References to figures: Verbeke 1950 (aedeagus, surstylus); Verbeke 1961 (surstylus). Knutson et al. 1967 (S. h. hispanica: egg; I, II, III instar cephalopharyngeal skeleton and posterior spiracular disc; II, III instar anterior spiracle, puparium). Holotype: ♂, RWANDA: Ruhengeri (sources Kiri), 1800–1825m, 31.viii.1934, (Mission G.F. de Witte) (MRAC). Seen by Knutson in 1978 in IRSNB, Cabinet 41, “Parc National Albert”, Box. 1. Verbeke, 1950 placed his S. ruhengeriensis and four other new species (S. lippensi, S. saegeri, S. simulans and S. uelensis) along with S. trichroocelis Speiser, 1910 in his “Groupe G (Groupe trichrooscelis)” of the subgenus Parasepedon. Verbeke (1963) placed S. parvipennis Steyskal, 1956 in this group, but that species was synonymized under S. saegeri in Verbeke (1963) and confirmed by Verbeke in litt. 1968 in his review of his MS of Knutson (1980). Knutson et al. (1967) noted “ Sepedon h. hispanica was described from one female collected in Andalusia (Loew, 1862). The species was apparently not seen by most European dipterists and its validity was in doubt until it was rediscovered by the senior author in Andalusia in 1964. Specimens were sent to Dr. J. Verbeke, who identified them as conspecific with the type specimen of Loew. Verbeke (1964) placed S. ruhengeriensis Verbeke, 1950 (described from tropical Africa) as a junior synonym of S. hispanica Loew 1862. The populations from Spain and Africa were considered subspecifically distinct and were given the trivial names of S. h. hispanica Loew and S. h. ruhengeriensis Verbeke, respectively. Keys to the six species were presented by Verbeke (1950, 1961). Verbeke (1961) placed the species in 3 “categories” (trichrooscelis + lippensi, saegeri + uelensis, and hispanica + simulans). Recent study of extensive material indicates that there are several additional species in this Group. In West Africa S. hispanica ruhengeriensis is most similar to S. trichrooscelis. In general, specimens of S. h. ruhengeriensis are larger than those of S. trichrooscelis and the femora are more distinctly reddened. The prosternum is usually more densely setose in S. hispanica ruhengeriensis than in S. trichrooscelis. The frons of S. hispanica ruhengeriensis is generally in part yellowish brown, but in S. trichrooscelis it is usually shiny black. NIGERIA: Zaria, Samaru, 1♂, 24.vii.1968 (USNM). Same locality, 1♂, 23.ii.1968; 1♂, 4.iii.1972; 1♂, 2.iii.1967, m. v. trap (IARS) all collected by Deeming); Zaria, Samaru, stream, L. Shika, many adults 26, 28.iii., 2.iv.1973, Deeming, Gadzama & Knutson (USNM). CAMEROUN: Musake, Mt. Cameroun, 1800m, 10♂4♀, no date, Fini (MNHNP); Nyasoso, 1♂, 3.xi.1949, Oldroyd (NHMUK). New records: DEMOCRATIC REPUBLIC OF CONGO: Haut-Ituri, Nioka, 1750m, 1♀, i–ii.1975, P. Schäuffele (SMS); Elizabethville 3♂, 3.ix.1931, A. Mackie (NHMUK); Lake Nganga, 1♂, no date, Allen, Brooks (MCZ); Mt. Selinda 1♀, xi–xii.1936, R.H.R. Stevenson (MCZ). TANZANIA: Dar-es-Salam 1♂ 1♀, vii.1969, Ardö (RD). MALAWI: Limbe 1♂, ix.1916, R.C. Wood (NHMUK). ETHIOPIA: Bahar Dar 1♂, 11.x.1968, K. W. & H. Harde (SMS); 15km W. Addis Ababa 1♂, 12.i.1968, J.W. Boyes (CNC); Managesh Forest, 30km NW Addis Ababa, 1.i.1972, J. Kügler, 1♂, (USNM), 2♂3♀, (TAU); Debra Libanos 1♂, 2.i.1972, A. Friedberg (TAU). Published records. DEMOCRATIC REPUBLIC OF CONGO (Verbeke 1950, 1961, 1963); MOZAMBIQUE (Verbeke 1962b); MOROCCO (Vala & Ghamizi 1991) (= S. h. hispanica). Biology. Knutson et al. (1967), Knutson (2008). Parasitoid/predators of semi-terrestrial Succineidae snails.Published as part of Knutson, Lloyd V., Deeming, John C. & Ebejer, Martin J., 2018, The Snail-killing Flies (Diptera: Sciomyzidae) of West Africa, pp. 67-100 in Zootaxa 4483 (1) on pages 79-82, DOI: 10.11646/zootaxa.4483.1.3, http://zenodo.org/record/143663
Speaking of trade: Key issues for agriculture
No full textThis archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu.Hadley, Herbert H.; Henderson, Dennis R.; Knutson, Ronald D.. (1983). Speaking of trade: Key issues for agriculture. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/203918
Wooddale Station Redevelopment Framework
No full textImboden, Anders; Knutson, Lindsey; Leitner, Lyssa; Muellman, Kelly. (2011). Wooddale Station Redevelopment Framework. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/107400
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
Warm Spitzer occultation photometry of WASP-26b at 3.6 and 4.5 mu m
No full textWe present new warm Spitzer occultation photometry of WASP-26 at 3.6 and 4.5 mu m along with new transit photometry taken in the g, r and i bands. We report the first detection of the occultation of WASP-26b, with occultation depths at 3.6 and 4.5 mu m of 0.001 26 +/- 0.000 13 and 0.001 49 +/- 0.000 16 corresponding to brightness temperatures of 1825 +/- 80 and 1725 +/- 89 K, respectively. We find that the eccentricity of the orbit is consistent with a circular orbit at the 1 sigma level (e = 0.0028(-0.0022)(+0.0097), 3 sigma upper limit e < 0.04). According to the activity-inversion relation of Knutson et al., WASP-26b is predicted to host a thermal inversion. The brightness temperatures deduced from the eclipse depths are consistent with an isothermal atmosphere, although the planet may host a weak thermal inversion given the uncertainties on these values. The data are equally well fitted by atmospheric models with or without a thermal inversion. We find that variation in activity of solar-like stars does not change enough over the time-scales of months or years to change the interpretation of the Knutson et al. activity-inversion relation, provided that the measured activity level is averaged over several nights. Further data are required to fully constrain the thermal structure of the atmosphere because the planet lies very close to the boundary between atmospheres with and without a thermal inversion.Peer reviewe
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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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