Results 281 to 290 of about 487,215 (333)

Phenyl-γ-valerolactones and phenylvaleric acids, the main colonic metabolites of flavan-3-ols: synthesis, analysis, bioavailability, and bioactivity.

Natural product reports (Print), 2019
Covering: 1958 to June 2018 Phenyl-γ-valerolactones (PVLs) and their related phenylvaleric acids (PVAs) are the main metabolites of flavan-3-ols, the major class of flavonoids in the human diet.
P. Mena, L. Bresciani, N. Brindani, I. Ludwig, G. Pereira-Caro, D. Angelino, R. Llorach, Luca Calani, F. Brighenti, M. Clifford, C. Gill, A. Crozier, C. Curti, D. Del Rio   +13 more
semanticscholar   +1 more source

Developing a new cross-sensor calibration model for DMSP-OLS and Suomi-NPP VIIRS night-light imageries

Isprs Journal of Photogrammetry and Remote Sensing, 2019
Night-time light (NTL) data provides a great opportunity to monitor human activities and settlements. Currently, global-scale NTL data are acquired by two satellite sensors, i.e., DMSP-OLS and VIIRS, but the data collected by the satellites are not ...
Qiming Zheng, Qihao Weng, Ke Wang
semanticscholar   +1 more source

Sensemakr: Sensitivity Analysis Tools for OLS in R and Stata

Social Science Research Network
:This tutorial introduces the package sensemakr for R and Stata, which implements a suite of sensitivity analysis tools for regression models developed in Cinelli and Hazlett (2020, 2022).
Carlos Cinelli, Jeremy Ferwerda, C. Hazlett   +2 more
semanticscholar   +1 more source

Two-stage estimation of the impact of contextual variables in stochastic frontier production function models using Data Envelopment Analysis: Second stage OLS versus bootstrap approaches

European Journal of Operational Research, 2019
Banker and Natarajan (2008) identified sufficient conditions in a stochastic framework to justify the popular two-stage approach of Data Envelopment Analysis followed by Ordinary Least Squares (DEA + OLS) to estimate the impact of contextual variables on
R. Banker, R. Natarajan, Daqun Zhang
semanticscholar   +1 more source

Pregnan-7-ol and Pregnan-12-ol

Nature, 1951
Ruff and Reichstein1 have described a pregnan-7-ol and a pregnan-12-ol prepared by Wolff–Kishner reduction of acetoxypregnane ketones. They state that these two substances are probably the 7α- and 12α-hydroxy compounds; but since epimerization during Wolff–Kishner reduction is not excluded, they name them provisionally ‘7ξ’ and ‘12ξ’2.
openaire   +2 more sources

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2021
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openaire   +1 more source

Urban mapping using DMSP/OLS stable night-time light: a review

Remote Sensing of Night-time Light, 2017
The Defense Meteorological Satellite Program/Operational Linescane System (DMSP/OLS) stable night-time light (NTL) data showed great potential in urban extent mapping across a variety of scales with historical records dating back to 1990s.
Xuecao Li, Yuyu Zhou
semanticscholar   +1 more source

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2018
, LED C ...
openaire   +2 more sources

Estimating MIDAS regressions via OLS with polynomial parameter profiling

Econometrics and Statistics, 2019
A typical MIDAS regression involves estimating parameters via nonlinear least squares, unless U-MIDAS is applied – which involves OLS – the latter being appealing when the sampling frequency differences are small.
Eric Ghysels, Hang Qian
semanticscholar   +1 more source