Results 61 to 70 of about 137,668 (308)

The [3,3]‐Sigmatropic Allyl Cyanate–Isocyanate Rearrangement on Levoglucosenone Derivatives Stereoselectively Provides 4‐Deoxy‐4‐Aminosugars

open access: yesChemistry–Methods, EarlyView.
The Ichikawa rearrangement of allyl cyanates obtained in situ from levoglucosenone‐derived allyl carbamates allows the synthesis of unique 4‐deoxy‐4‐amino‐d‐allose derivatives with complete chirality transfer in a metal‐free three‐step, one‐pot manner.
Debora Pratesi   +6 more
wiley   +1 more source

Multiplicative processes as a source of fat-tail distributions

open access: yesHeliyon, 2020
Many works in the literature are in favour of the universality of power-laws. However, more recently, a significant amount of research has exposed more subtle details about this subject.
Fabio G. Guerrero, Angel Garcia-Baños
doaj   +1 more source

A Method Combining Model Optimization Algorithm and Grey Relational Analysis for Analyzing Factors Affecting Photovoltaic Cell Output Characteristics

open access: yesEnergy Science &Engineering, EarlyView.
For output power, light intensity has the highest correlation, indicating that light intensity is the most sensitive factor affecting the output power of PV cells, and its changes have the most significant impact on output power. The change in temperature will lead to changes in the concentration and mobility of carrier inside the battery, which will ...
Biying Zhou, Peng Zhang
wiley   +1 more source

An explicit solution for calculating optimum spawning stock size from Ricker’s stock recruitment model [PDF]

open access: yesPeerJ, 2016
Stock-recruitment models have been used for decades in fisheries management as a means of formalizing the expected number of offspring that recruit to a fishery based on the number of parents.
Mark D. Scheuerell
doaj   +2 more sources

On one classification of transcendental numbers

open access: yesLithuanian Mathematical Journal, 1962
The abstracts (in two languages) can be found in the pdf file of the article. Original author name(s) and title in Russian and Lithuanian: В. Г. Спринджук. Об одной классификации транцендентных чисел V. Sprindžiuk.
openaire   +3 more sources

P-Adic Transcendental Numbers [PDF]

open access: yesProceedings of the American Mathematical Society, 1990
Explicit sets of cardinality 2'o of p-adic numbers which are algebraically independent over Qp are constructed. Let Qp be the p-adic completion of Q for a prime p. Let Qp be the algebraic closure of Qp, and Cp be its p-adic completion which is an algebraically closed field of cardinality 2"O .
openaire   +1 more source

Fixed points of composite entire and quasiregular maps [PDF]

open access: yes, 2005
We give a new proof of the result that if f and g are transcendental entire functions, then the composite function f(g) has infinitely many fixed points. The method yields a number of generalization of this result.
Bergweiler, Walter
core   +2 more sources

Optimal Parameter Extraction of Three‐Diode Photovoltaic Model Using the Hybrid Golden Jackal Optimizer With Fitness Distance Balance Mechanism and Berndt‐Hall‐Hall‐Hausman Method

open access: yesEnergy Science &Engineering, EarlyView.
Optimal parameter extraction of three‐diode photovoltaic model using the hybrid golden jackal optimizer with fitness distance balance mechanism and Berndt‐Hall‐Hall‐Hausman method. ABSTRACT Accurate simulation and operation of photovoltaic (PV) systems depend on reliable extraction of model parameters from experimental data.
Muthuramalingam Lakshmanan   +3 more
wiley   +1 more source

Adolescent Anxiety During the COVID‐19 Pandemic: A Qualitative Systematic Review of Risk and Protective Factors

open access: yesJournal of Adolescence, EarlyView.
ABSTRACT Introduction The COVID‐19 pandemic significantly disrupted adolescents' lives, leading to increased stress and anxiety rates globally. Although existing research highlights the necessity of understanding the increased rates of anxiety in adolescents during and after the pandemic, it offers little insight into the risk and protective factors ...
Buket Kara   +5 more
wiley   +1 more source

Terahertz All‐Dielectric Maxwell Fisheye Lens Waveguide Crossings via Transformation Optics

open access: yesLaser &Photonics Reviews, EarlyView.
All‐silicon terahertz waveguide crossings based on Maxwell fisheye lenses are reshaped using transformation optics to interface with planar waveguides while reducing mode mismatch. Realized via subwavelength perforations in a single etching step, 2 × 2 and 3 × 3 crossings achieve broadband transmission with low loss and ultralow crosstalk across 220 ...
Nikolaos Xenidis   +2 more
wiley   +1 more source

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