Results 111 to 120 of about 4,474,661 (295)

Waves of range dynamics and gene flow characterize the biogeographic history of Litsea elongata, a dominant tree in East Asian evergreen broadleaved forests

open access: yesPLANTS, PEOPLE, PLANET, EarlyView.
Evergreen broadleaved forests (EBLFs) represent an iconic vegetation type in subtropical montane East Asia, but they are experiencing intensifying anthropogenic pressure and increasing habitat fragmentation. Here, using a dominant and widespread tree species characteristic of East Asian EBLFs, we examine its phylogeographic history and evaluate what it
Sheng‐Yuan Qin   +7 more
wiley   +1 more source

Non-destructive one-shot device test under step-stress experiment with lognormal lifetime distribution

open access: yes
2023 Acuerdos transformativos CRUEDealing with censored data is an important concern in reliability and survival analysis. Non-destructive one-shot devices are an extreme case of interval censoring, wherein we only know if a device has failed or not ...
Leandro Pardo   +5 more
core   +1 more source

Directive Antenna Clutter Loss in Slant Paths

open access: yesInternational Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT This paper investigates the development of a clutter loss model specifically for slant paths involving directive antennas. Conventionally, clutter loss is characterized by using isotropic antennas to facilitate standard link budget calculations via single antenna gain values.
Fernando Pérez Fontán   +4 more
wiley   +1 more source

Integrating Image Segmentation and Deep Learning to Improve Radio Frequency Propagation Models

open access: yesInternational Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT This paper proposes a multi‐sensor approach to improve radio frequency (RF) propagation models, which play a key role in the rapidly expanding field of connected vehicle technology. Focusing on the 1‐ to 20‐GHz frequency range, which is critical for both satellite‐to‐vehicle and base station‐to‐vehicle communications, our study introduces a ...
Jonathan Israel   +2 more
wiley   +1 more source

The Generalized Lognormal Distribution as an Income Distribution

open access: yes, 2003
Introduction Over the last 100 years, a large number of distributions has been proposed for the modeling of size phenomena, notably the size distribution of personal incomes (see, for example, Kleiber and Kotz, 2003).
Stefanie Scheid   +2 more
core   +1 more source

Something New, Something Old: Parametric Models for the Size of Distribution of Income

open access: yes, 1997
Two new probability density functions (generalized beta and quadratic elasticity) are considered as models for the size distribution of income. The generalized beta distribution nests the generalized beta of the first and second kind, generalized gamma ...
McDonald, James B.   +2 more
core  

Identification and Discrimination of Sulfated and Unsulfated Gut‐Hormone Biomarkers in Human Serum by Nanopore

open access: yesSmall, EarlyView.
This study discriminates between sulfated and unsulfated cholecystokinin‐8 gut‐hormone forms at single‐molecule‐level resolution. Using an aerolysin nanopore embedded in a hybrid lipid‐polymer membrane, the system produces distinct electrical signatures enabling highly sensitive detection, even in 20% human serum.
Luca Iesu   +3 more
wiley   +1 more source

Fitting household income by lognormal distribution.

open access: yes, 2018
Fitting household income by lognormal distribution.
Wei Nie (175261)   +2 more
core   +1 more source

“Wire‐Print” as a New Sample Preparation Procedure for Accurate Morphological and Chemical Analysis of Particles and Flakes With Microscopy and Spectroscopy Methods

open access: yesSmall Methods, EarlyView.
A new method enables reproducible sample preparation via so‐called “wire‐print” deposition. It is characterized by ease of handling and is compatible with most substrates and suspensions. Furthermore, it allows for both the morphological analysis of separated flocs and particles and the chemical examination of compact, thick wire‐print spots.
Paul Mrkwitschka   +7 more
wiley   +1 more source

Multi‐level fatigue reliability assessment of reinforced concrete railway bridges

open access: yesStructural Concrete, EarlyView.
Abstract This paper presents a multi‐level reliability framework for assessing the fatigue life of reinforced concrete (RC) railway trough bridges subjected to cyclic loading. The framework incorporates increasing levels of analytical complexity and real‐world data in four steps. First, an analytical model applies S–N curves and the Palmgren–Miner rule
Silvia Sarmiento   +7 more
wiley   +1 more source

Home - About - Disclaimer - Privacy