Results 61 to 70 of about 1,284,966 (332)

Graceful and Strongly Graceful Permutations

open access: yes, 2021
A graceful labelling of a graph G is an injective function f from the set of vertices of G into the set {0,1,...,|EG|} such that if edge uv is assigned the label |f(u)-f(v)| then all edge labels have distinct values. A strong graceful labelling of a tree T with a perfect matching is a graceful labelling of T with the additional property that the sum of
openaire   +2 more sources

Dimensions of Grace: Factor Analysis of Three Grace Scales

open access: yes, 2014
Measuring grace is challenging. Prior research found the Grace Scale (GS), Richmont Grace Scale (RGS), and The Amazing Grace Scale (TAGS) to be reliable, have promising convergent and divergent validity, and to inter-correlate strongly. However, they may
Blackburn, Amanda M.   +2 more
core  

Developing a preliminary recharge model of the Nile Basin to help interpret GRACE data [PDF]

open access: yes, 2009
GRACE data provides a new and exciting opportunity to gain a direct and independent measure of water mass variation on a regional scale, but the data must be combined with hydrological modelling to indicate in which part of the water cycle the mass ...
Bonsor, H.C.   +4 more
core  

Copper‐based Materials for Photo and Electrocatalytic Process: Advancing Renewable Energy and Environmental Applications

open access: yesAdvanced Functional Materials, EarlyView.
Cu‐based catalysts as a cornerstone in advancing sustainable energy technologies are fully reviewed in this manuscript, highlighting their potential in photo‐ and electrocatalysis. It includes metallic copper, copper oxides, copper sulfides, copper halide perovskites, copper‐based metal–organic frameworks (MOFs), and covalent organic frameworks (COFs),
Jéssica C. de Almeida   +16 more
wiley   +1 more source

Greening Trends of Southern China Confirmed by GRACE

open access: yesRemote Sensing, 2020
As reported by the National Aeronautics and Space Administration (NASA), the world has been greening over the last two decades, with the highest greening occurring in China and India.
Le Chang, Wenke Sun
doaj   +1 more source

MnI‐Functionalized Covalent Organic Framework as Efficient Electrocatalyst for CO2 Reduction in a Catholyte‐Free Zero‐Gap Electrolyzer

open access: yesAdvanced Functional Materials, EarlyView.
This work demonstrates the successful integration of a phenanthroline‐based 2D COF with MnI catalytic sites into a catholyte‐free membrane‐electrode‐assembly cell for CO2 electroreduction. The crystalline COF actively suppresses Mn⁰–Mn⁰ dimerization, achieving a turnover frequency of 617 h⁻¹ at 2.8 V (full‐cell potential), and enabling stable operation.
Laura Spies   +8 more
wiley   +1 more source

Rational Fine‐Tuning of MOF Pore Metrics: Enhanced SO2 Capture and Sensing with Optimal Multi‐Site Interactions

open access: yesAdvanced Functional Materials, EarlyView.
A pore tuning strategy to amplify the multi‐site MOF‐SO2 interactions is proposed to achieve an enhanced trace SO2 capture and chemiresistive sensing in highly stable isostructural DMOFs by annelating benzene rings. This work provides a facile strategy to achieve tailor‐made stable MOF materials for specific multifunctional applications.
Shanghua Xing   +9 more
wiley   +1 more source

Kant’s Robust Theory of Grace [PDF]

open access: yes, 2017
In this paper I argue against two prevailing views of Kant’s Religion. Against commentators such as Michalson and Quinn, who have argued that Kant’s project in Religion is riddled with inconsistencies and circularities, I show that a proper understanding
Mariña, Jacqueline
core   +1 more source

Enhancing CoFe Catalysts with V2CTX MXene‐Derived Materials for Anion Exchange Membrane Electrolyzers

open access: yesAdvanced Functional Materials, EarlyView.
MXene dervied CoFe composites show increased initial Oxygen Evolution Reaction (OER) activity compared to the pure CoFe and MXene in an Anion Exchange Membrane device. Vanadium vacancies in the MXene plays a role in increased OER activity and hinders Fe leaching in the AEM device over using the pure V2C MXene as a support material for the CoFe ...
Can Kaplan   +16 more
wiley   +1 more source

Ureaplasma urealyticum upregulates seminal fluid leukocytes and lowers human semen quality: a systematic review and meta-analysis

open access: yesBasic and Clinical Andrology
Background Ureaplasma urealyticum belongs to the class Mollicutes and causes non-gonococcal urethritis, an inflammation of the urethra that is linked with impaired semen quality.
Omotola SeunFunmi Kukoyi   +4 more
doaj   +1 more source

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