204,959 research outputs found
Shaded contour lines or Tanaka method with R
No full text[edit]The tanaka package, released after this post, facilitates the creation of such maps[/edit]. The following post, Tanaka method or how to make shaded contour lines on LandscapeArchaeology.org blog, explains clearly and thoroughly what shaded contour lines are and how to draw them with QGIS. How hard would it be to implement this method with R? From LandscapeArchaeology.org This method is used to enhance the elevation visibility on raster images, so the first step consists in getting or ..
Tanaka spaces and products of sequential spaces
No full textsummary:We consider properties of Tanaka spaces (introduced in Mynard F., {\it More on strongly sequential spaces\/}, Comment. Math. Univ. Carolin. {\bf 43} (2002), 525--530), strongly sequential spaces, and weakly sequential spaces. Applications include product theorems for these types of spaces
The tanaka package
No full textThe tanaka package has been released on CRAN. This package is a simplified implementation of the Tanaka method. Also called "relief contours method", "illuminated contour method" or "shaded contour lines method", the Tanaka method enhances the representation of topography on a map using shaded contour lines. North-west white contours represent illuminated topography and south-east black contours represent shaded topography. The contour lines creation relies on isoband, spatial data manipu..
Linear mixed models for agricultural researchers with ASReml-R
No full textIn this session, I will explain the motivation and intuition behind building some statistical models to analyse data from plant breeding programs. These models will include linear mixed models, factor analytic models and spatial models for prediction of genotype-by-environment effects. I will demonstrate how to fit each of these models using ASReml-R in addition to explaining how to interpret the results.© Emi Tanaka</div
Normalized solutions for fractional nonlinear scalar field equations via Lagrangian formulation
No full textWe study existence of solutions for the fractional problem (Pm)
(−Δ)su + μu = g(u) in RN,
RN
u2dx = m,
u ∈ Hs
r (RN),
where N 2, s ∈ (0, 1), m > 0, μ is an unknown Lagrange multiplier and
g ∈ C(R,R) satisfies Berestycki–Lions type conditions. Using a Lagrangian
formulation of the problem (Pm), we prove the existence of a weak solution
with prescribed mass when g has L2 subcritical growth. The approach relies on
the construction of a minimax structure, by means of a Pohozaev’s mountain in
a product space and some deformation arguments under a new version of the
Palais–Smale condition introduced in Hirata and Tanaka (2019 Adv. Nonlinear
Stud. 19 263–90); Ikoma and Tanaka (2019 Adv. Differ. Equ. 24 609–46). A
multiplicity result of infinitely many normalized solutions is also obtained if g
is odd
Rullierinereis imajimai nom. nov., a replacement name for R. profunda Imajima, 2009, secondary homonym to R. profunda (Hartman, 1965), formerly Namalycastis profundus
No full textTanaka, Masaatsu, Sato, Masanori (2017): Rullierinereis imajimai nom. nov., a replacement name for R. profunda Imajima, 2009, secondary homonym to R. profunda (Hartman, 1965), formerly Namalycastis profundus. Zootaxa 4341 (3), DOI: https://doi.org/10.11646/zootaxa.4341.3.
Semi-classical Analysis Around Local Maxima and Saddle Points for Degenerate Nonlinear Choquard Equations
No full textWe study existence of semi-classical states for the nonlinear Choquard equation:
−ε2 v + V(x)v = 1
εα
(Iα ∗ F(v)) f (v) in RN ,
where N ≥ 3, α ∈ (0, N), Iα(x) = Aα/|x|N−α is the Riesz potential, F ∈ C1(R,R),
F
(s) = f (s) andε > 0 is a small parameter.We develop a new variational approach,
in which our deformation flow is generated through a flow in an augmented space
to get a suitable compactness property and to reflect the properties of the potential.
Furthermore our flow keeps the size of the tails of the function small and it enables us
to find a critical point without introducing a penalization term.We show the existence
of a family of solutions concentrating to a local maximum or a saddle point of V(x) ∈
CN (RN ,R) under general conditions on F(s).Our results extend the results by Moroz
and Van Schaftingen (Calc Var Partial Differ Equ 52:199–235, 2015) for local minima
(see also Cingolani and Tanaka (Rev Mat Iberoam 35(6):1885–1924, 2019)) and Wei
and Winter (J Math Phys 50:012905, 2009) for non-degenerate critical points of the
potential
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
Visualising experimental designs with the edibble and deggust R-packages
No full textThis session is a continuation from the previous session and expands on the constructions of the experimental designs with edibble. The session will also talk about some principles of the grammar of graphics implemented in the ggplot2 R-package and introduce how the deggust R-package can be used to create an easy and quick way to visualise experimental designs constructed with the edibble framework.Survey link: https://www.surveymonkey.com/r/WBMXFB8© Emi Tanaka, 2021</div
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