105,020 research outputs found
Joshua Davis: Author of Spare Parts
No full textCitation: K-State First (2016). Joshua Davis: Author of Spare Parts [Flier]. Manhattan, Kansas: K-State First.Flyer advertising Joshua Davis's author talk at Kansas State University
Singularities and K-stability
No full textWe study invariants of singularities that have arisen in connection with the K-stability of Fano varieties. The first invariant we consider is Li's normalized volume function on the space of valuations over a klt singularitiy. Proving a conjecture of Li, we show that there always exists a valuation over a klt singularity with smallest normalized volume. Next, we present joint work with Mattias Jonsson on the log canonical and stability thresholds of a line bundle. The latter notion generalizes an invariant recently introduced by Fujita and Odaka, and can be used to characterize when a Fano variety is K-semistable or uniformly K-stable. We express the two thresholds as infima of certain functionals on the space of valuations and systematically study these invariants.PhDMathematicsUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttps://deepblue.lib.umich.edu/bitstream/2027.42/146044/1/blum_1.pd
A non-Archimedean Approach to K-stability of Log Fano Cone Singularities
No full textLog Fano cone singularities are generalizations of cones over log Fano varieties. There is a local K-stability theory for log Fano cone singularities, originally developed by Collins-Székelyhidi, generalizing the one for log Fano varieties. Similar to its global counterpart, local K-stability serves as an obstruction to the existence of certain canonical metrics on log Fano cone singularities.
This thesis studies local K-stability from a non-Archimedean point of view. We first introduce the local Monge-Ampère energy, generalizing a valuative invariant studied by Blum-Jonsson, in the log Fano case. We then move on to developing a non-Archimedean pluripotential theory, generalizing the global theory developed by Boucksom-Hisamoto-Jonsson, and Boucksom-Jonsson. Finally, as an application of the local pluripotential theory, we give a non-Archimedean characterization of local K-stability.PhDMathematicsUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/178122/1/yueqiaow_1.pd
Steven Johnson Author Talk Poster
No full textK-State Book NetworkA poster advertising an author talk by Steven Johnson at Kansas State University on September 3, 2014. Steven Johnson's book "The Ghost Map" was the 2014-2015 common book
Mangani-pargasite, NaCa2(Mg4Mn3+)(Si6Al2)O22(OH)2, a new mineral species of the amphibole supergroup
No full textMangani-pargasite, ideally NaCa2(Mg4Mn3+)(Si6Al2)O22(OH)2, is a new mineral species of the calcium amphibole subgroup of the amphibole supergroup. The type specimen was found on the mine dump of the Långban Fe-Mn-(Ba-As-Pb-Sb) deposit in Värmland, Sweden. Crystal chemical analyses resulted in the empirical chemical formula: A(Na0.90Pb0.07K0.03)Σ1.00B(Ca1.93Mn2+0.07)Σ2.00C(Mg4.25Mn3+0.39Al0.26 Fe3+0.10)Σ5.00T(Si6.35Al1.65)Σ8.00O22W(OH)2. In order to complete the description of this newly approved (IMA 2018-151) mineral we report here additional data to those published in papers by Jonsson and Hålenius (2010) and Hålenius and Bosi (2012). Mangani-pargasite is biaxial positive, with a=1.635(5), b=1.645(5), g=1.660(5) and the measured optic angle 2V is 85(5)°. The dispersion is weak (r>v), and the optic orientation is: Y||b; Z^c=25(3)°. Mangani-pargasite is red to brownish red with weak pleochroism; X=pale reddish brown, Y=pale reddish brown and Z=pale brownish red; X≈Y>Z. The unit-cell parameters are a=9.9448(5), b=18.0171(9), c=5.2829(3) Å, b=105.445(3)°, V=912.39(9) Å3, Z=2, space group C2/m. The ten strongest reflections in the X-ray powder diffraction pattern [d-values in Å, I, (h k l)] are: 8.420, 29, (110); 3.368, 17, (131), 3.279, 49, (240); 3.141, 100, (310); 2.817, 44, (33 0); 2.698, 21, (151); 2.389, 18, (350); 1.904, 29, (510); 1.650, 22, (461) and 1.448, 46, (661)
Mitosis in storage cells of the eutardigrade Richtersius coronifer
No full textCzernekova, Michaela, Jonsson, K. Ingemar (2016): Mitosis in storage cells of the eutardigrade Richtersius coronifer. Zoological Journal of the Linnean Society 178 (4): 888-896, DOI: 10.1111/zoj.12440, URL: http://dx.doi.org/10.1111/zoj.1244
Figure 1 in Mitosis in storage cells of the eutardigrade Richtersius coronifer
No full textFigure 1. Storage cell of Richtersius coronifer with chromosomes in metaphase of the mitotic cycle. Light microscopy. Scale bar: 10 µm.Published as part of Czernekova, Michaela & Jonsson, K. Ingemar, 2016, Mitosis in storage cells of the eutardigrade Richtersius coronifer, pp. 888-896 in Zoological Journal of the Linnean Society 178 (4) on page 890, DOI: 10.1111/zoj.12440, http://zenodo.org/record/536936
Effects of methyl bromide fumigation on anhydrobiotic micrometazoans
No full textAnhydrobiotic organisms are well known for their resistance to extreme environmental conditions while in the inactive, ametabolic, state. Our study confirms that this resistance also transfers to treatments with the fumigant methyl bromide. We found alive specimens of nematodes, rotifers and tardigrades after 70 h treatment with methyl bromide. Quantitative estimates of survival in the eutardigrade Richtersius coronifer revealed no difference between treated and untreated samples which had been kept dry for similar times. However, R. coronifer from samples collected 11 months before treatment had lower survival compared to samples collected shortly before the treatment. The fact that anhydrobiotic organisms escape treatments with biocides should be considered a serious problem, both for the food industry and from the perspective of human mediated spread of organisms
Facts and fiction about long-term survival in tardigrades
No full textTardigrades have achieved a widespread reputation for an ability to survive more than a century in an inactive, ametabolic state called cryptobiosis, However, a closer look at the empirical evidence provides little support for the claim that tardigrades are capable of century-long survival. Instead, current evidence suggests that a decade may more realistically represent the upper limit of cryptobiotic survival in the most resistant tardigrades
- …
