2,629 research outputs found
The structural, vibrational and electrical properties of lithium ion conducting plasticized (PVdF-HFP)/PEMA blend
No full textThe plasticized polymer PVdF-HFP was taken as the host and blended with 5 wt % of PEMA. The effect of blending with respect to structural, vibrational and electrical properties was studied. Blending PEMA with plasticized polymer PVdF-HFP was found to successfully enhance the film flexibility and conductivity. The dielectric spectra show an increase in side chain movement after blending.
Nelson-Gon/manymodelr: manymodelr 0.3.5
No full texttitle: "manymodelr-News" author: "Nelson Gonzabato" output: htlm_document
manymodelr 0.3.5
Extended fit_models to support model fitting for several variables for several model types.
manymodelr 0.3.2
Patch related to failing tests on old R releases, skip tests on these.
manymodelr 0.3.1
Fixed issues for CRAN
manymodelr 0.3.0
Major additions
extract_model_info now supports glmerMod and glmmTMB
get_this now works with numeric input and also supports data.frame objects.
fit_models extends fit_model by building many models at once.
Other changes
get_stats now drops columns via a vector and not "non_numeric" as previously.
Metrics from multi_model_1 are now more informative with the metric and method wrapped in the naming of the result.
df was renamed as old_data in multi_model_1, newdata to new_data.
plot_corr now directly accepts data.frame objects. Arguments like round_values have also been dropped.
Fixed DOI to Max Kuhn's paper
Refactored get_mode to be tidy compliant.
The argument valid was dropped in multi_model_1.
get_all was dropped in select_percentile.
select_col, select_percentile, row_mean_na will be removed in the next release.
row_mean_na is now defunct. Use na_replace instead.
na_replace no longer allows using functions such as mean,min, etc. These have been reimplemented in the package mde
modeleR is now defunct. Use fit_model instead.
get_this no longer accepts non quoted character strings.
Better coverage and code tests
manymodelr 0.2.4
Fixes paper citation
manymodelr 0.2.3
New functions
plot_corr has been added to allow plotting of correlation matrices produced by get_var_corr_.
na_replace_grouped extends na_replace by allowing replacement of missing values(NAs) by group.
add_model_predictions allows addition of predicted values to a data set.
add_model_residuals is an easy to use and dplyr compatible wrapper that allows addition of residuals to a data set.
extract_model_info allows easy extraction of common model attributes such as p values, residuals, coefficients, etc as per the specific model type. It supports extraction of multiple attributes.
multi_model_2 allows fitting and predicting in one function. It is similar to multi_model_1 except it does not require metrics.
Major Changes
modeleR has been replaced with fit_model which is an easier to remember name. Usage remains the same.
fit_model no longer allows direct addition of predictions. Use add_model_predictions to achieve the same.
na_replace has been extended to allow for user defined values.
rowdiff now accepts replacement of the calculation induced NAs. It does so by using na_replace.
get_var_corr_ now supports using only a subset of the data.
Helper functions are no longer exported.
get_data_Stats is now aliased with get_stats for ease.
get_var_corr no longer has the get_all argument. Instead, users can provide an option other_vars vector of subset columns. drop_columns has also been changed from boolean to a character vector.
manymodelr 0.2.2
Minor bug fixes with respect to the vignette.
manymodelr 0.2.1
Major Changes
Additions
agg_by_group is a new function that manipulates grouped data. It is fast and robust for many kinds of functions.
rowdiff is another new function that enable one to find differences between rows in a data.frame object. `
get_var_corr provides a user-friendly way to find correlations between data.
get_var_corr_ provides a user-friendly way to find combination-wise correlations. It is relatively fast depending on how big one's data is and/or machine specifications.
get_this is an easy to use helper function to get metrics,predictions, etc. Currently supports lists and data.frame objects.
modeleR and row_mean_na were removed.
Major Modifications
get_data_Stats now supports removal of missing data as well as using only numeric data.
modeleR has been fixed to handle new data as expected. It also now supports glm.
multi_model_1 now supports either validation or working with new data.
row_mean_na has been replaced with na_replace which is more robust. row_mean_na will be removed in future versions
Bipolar Cell Pathways in the Vertebrate Retina
No full textBook chapter published in:
Kolb, H., Fernandez, E., Nelson, R., Webvision: The Organization of the Retina and Visual System [Internet]
Two wives of Andrew P. Schow, James Schow, Martin Liston and William Osborn. These people were among the first settlers in Escalante, Utah.
No full textPhoto shows several early settlers of Escalante on the porch of an Escalante house in 1923. Caption from the book "The Mormon Village": "Original pioneers of Escalante photographed by the author in 1923. From left to right: William Osborn, Martin Liston, James Schow, and the two surviving wives of Andrew P. Schow.
The Czech Treasury Yield Curve from 1999 to the Present
No full textThe author estimates the Czech Treasury yield curve at a daily frequency from 1999 to the present. He uses the parsimonious yield curve model of Nelson and Siegel (1987), for which he suggests a parameter restriction that avoids abrupt changes in parameter estimates and thus allows for the economic interpretation of the model to hold. The estimation of the model parameters is based on market prices of Czech government bonds. The Nelson-Siegel model is shown to fit the Czech bond price data well without being over-parameterized. Thus, the model provides an accurate and consistent picture of the Czech Treasury yield curve evolution. The estimated parameters can be used to calculate spot rates and hence par rates, forward rates or the discount function for practically any maturity. To eh author´s knowledge, consistent time series of spot rates are not available for the Czech economy.yield curve, spot rates, treasury market, Nelson-Siegel
Investigation of shell and axisymmetric shell structures
No full textThe author is with the Central Electricity Research Laboratories (C. E. R. L. ) Leatherhead, of the Central Electricity Generating Board (C. E. G. B. ) In October 1974 he was registered with The City University to undertake research leading eventually to the Degree of Doctor of Philosophy. The author's research was carried out during the registration period and has also been reported in the following C. E. G. B. Publications: - 1. Nelson, R. L., VACTIL: a program to analyse the natural frequencies and mode shapes of cooling towers whilst explicitly including the effects of leg supports and foundation elasticity, C. E. G. B. pub. No. RD/L/P 10/76. 2. Nelson, R. L., and Hellewell, J. S., * Vibration tests on a 1/250th scale model of Didcot cooling tower, C. E. G. B. pub. No. RD/L/N 112/76. (The first author was a supervisor to the second author who was a pre-university vacation trainee. The first author was a co-worker during the project; also he commissioned the apparatus, planned the experiment and wrote the paper. ) 3. Nelson, R. L1., Stress matrix for a doubly curved shell finite element, C. E. G. B. pub. No. RD/L/N 113/76 4. Nelson, R. L1., A new algorithm to program the element matrices of doubly curved shell finite elements, C. E. G. B. pub. No. RD/L/N 139/77 5. Nelson, R. Ll., Free vibration analysis of cooling towers with leg-supports by a finite element method, C. E. C. B. pub. No. RD/L/R 1935 6. Nelson, R. Ll., Proposals for improved doubly curved shell finite elements, C. E. G. B. pub. No. RD/L/N 140/77 7. Nelson, R. L1., RESAP: a program to calculate the resonant stresses, frequencies and mode shapes of axisymmetric structures, C. E. G. B. pub. No. RD/L/P 9/77. 8. Nelson, R. L1., VACTILo2: a program to calculate the frequencies, mode shapes and stresses of shell structures, C. E. G. B. pub. No. RD/L/P /77. 9. Nelson, R. L1., Calculation of stresses mode shapes and frequencies of shell structures using doubly-curved finite elements, C. E. G. B. pub. No. RD/L/N _187/77. No part of this thesis, in whole or in part, has been submitted elsewhere for the award of a higher degree or qualification. Unless otherwise stated the work is the candidates own
Color processing in zebrafish retina
No full textPublished as: Meier A, Nelson R and
Connaughton VP (2018) Color
Processing in Zebrafish Retina.
Front. Cell. Neurosci. 12:327.
doi: 10.3389/fncel.2018.00327Zebrafish (Danio rerio) is a model organism for vertebrate developmental processes
and, through a variety of mutant and transgenic lines, various diseases and their
complications. Some of these diseases relate to proper function of the visual system.
In the US, the National Eye Institute indicates >140 million people over the age of
40 have some form of visual impairment. The causes of the impairments range from
refractive error to cataract, diabetic retinopathy and glaucoma, plus heritable diseases
such as retinitis pigmentosa and color vision deficits. Most impairments directly affect the
retina, the nervous tissue at the back of the eye. Zebrafish with long or short-wavelength
color blindness, altered retinal anatomy due to hyperglycemia, high intraocular pressure,
and reduced pigment epithelium are all used, and directly applicable, to study how
these symptoms affect visual function. However, many published reports describe only
molecular/anatomical/structural changes or behavioral deficits. Recent work in zebrafish
has documented physiological responses of the different cell types to colored (spectral)
light stimuli, indicating a complex level of information processing and color vision in this
species. The purpose of this review article is to consolidate published morphological
and physiological data from different cells to describe how zebrafish retina is capable of
complex visual processing. This information is compared to findings in other vertebrates
and relevance to disorders affecting color processing is discussed
A citizen's guide to employment, inflation, income, and the Oregon economy
No full textR. Bruce Rettig, David R. Darr, Ludwig M. Eisgruber, John P. Farrell, A. Gene Nelson, Gary W. Sorenson.This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Development and Architecture of the Village of Warfield
No full textThis essay focuses on the development of Warfield, BC, and the unique style of houses built in the town.Student paper submitted for Anthropology 100
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