Results 101 to 110 of about 5,195 (203)

Climate Change. Russia Country Paper [PDF]

human development, climate ...
Renat Perelet, Serguey Pegov and Mikhail Yulkin
core  

Shape Dynamics [PDF]

, 2013
Barbour's formulation of Mach's principle requires a theory of gravity to implement local relativity of clocks, local relativity of rods and spatial covariance. It turns out that relativity of clocks and rods are mutually exclusive.
Koslowski, Tim
core  

Segmentation of stroke lesions using transformers‐augmented MRI analysis

Human Brain Mapping, Volume 45, Issue 11, August 1, 2024.
This work presents an innovative stroke lesion segmentation model that leverages a transformer‐based architecture, utilizing deformable feature attention mechanism for precise segmentation. It also uses an ecological data augmentation technique where real lesions are inserted into healthy brain scans, which enhances model training and improves ...
Ramsha Ahmed, Aamna Al Shehhi, Naoufel Werghi, Mohamed L. Seghier   +3 more
wiley   +1 more source

Synthesis of Peptides by Reactive Extrusion. Application to the Continuous and Solventless Preparation of Aspartame.

ChemistryEurope, Volume 2, Issue 3-4, May 8, 2024.
Peptide synthesis was performed in a twin‐screw extruder. The reaction was achieved essentially in the absence of solvent, avoiding excesses of starting materials and reagents. This continuous flow mechanochemistry approach enabled the synthesis of a multi‐gram quantity of sweetener aspartame, a synthetic dipeptide.
Tharwat Mohy El‐Dine, Matthieu Lavayssiere, Hélène Adihou, Gilles Subra, Thomas‐Xavier Métro, Olivier Ludemann‐Hombourger, Frédéric Lamaty   +6 more
wiley   +1 more source

Highly Regioselective 1,3-Dipolar Cycloaddition of Nitrilimines and Thioaurones Towards Spiro-2-Pyrazolines: Synthesis, Characterization, and Mechanistic Study

Reactions
In this paper, we report a highly regioselective 1,3-dipolar cycloaddition (1,3-DC) reaction of nitrilimines with thioaurone derivatives that afforded the hitherto unreported spiropyrazolines. Spectroscopic and spectrometric data were utilized to confirm
Mohamed Bakhouch, Bouchra Es-Sounni, Ayoub Ouaddi, Khaoula Oudghiri, Mohammed Chalkha, Lahoucine Bahsis, Taoufiq Benali, Mohamed Bourass, Rabiaa Fdil, Mohamed Akhazzane, Mohamed El Yazidi   +10 more
doaj   +1 more source

A note on bigravity and dark matter

, 2009
We show that a class of bi-gravity theories contain solutions describing dark matter. A particular member of this class is also shown to be equivalent to the Eddington-Born-Infeld gravity, recently proposed as a candidate for dark matter.
Bañados, Máximo, Gomberoff, Andrés, Rodrigues, Davi C., Skordis, Constantinos   +3 more
core   +1 more source

A Molecular Electron Density Theory Study of the Synthesis of Spirobipyrazolines through the Domino Reaction of Nitrilimines with Allenoates

Molecules, 2019
The reaction of diphenyl nitrilimine (NI) with methyl 1-methyl-allenoate yielding a spirobipyrazoline has been studied within molecular electron density theory (MEDT) at the MPWB1K/6-311G(d) computational level in dichloromethane.
Luis R. Domingo, Fatemeh Ghodsi, Mar Ríos-Gutiérrez   +2 more
doaj   +1 more source

Theoretical insight into the mechanism and selectivity of the [3 + 2] cycloaddition reaction of N-methyl-1-phenylmethanimine oxide and bicyclopropylidene from the MEDT perspective

, 2023
Haydar Mohammad‐Salim, Jesus Vicente de Julián‐Ortiz   +1 more
openalex   +2 more sources

The Contribution of Moisture Sources of Precipitation to Water Resources Recharge in Semi-Arid Regions

Atmosphere
This study investigates the isotopic composition of precipitation in Iran and its moisture sources, offering insights crucial for addressing water recharge and management in semi-arid regions.
Hossein Mohammadzadeh, Rogert Sorí, Mojtaba Heydarizad   +2 more
doaj   +1 more source

A Molecular Electron Density Theory Study of the Chemoselectivity, Regioselectivity, and Diastereofacial Selectivity in the Synthesis of an Anticancer Spiroisoxazoline derived from α-Santonin

Molecules, 2019
The [3 + 2] cycloaddition (32CA) reaction of an α-santonin derivative, which has an exocyclic C⁻C double bond, with p-bromophenyl nitrile oxide yielding only one spiroisoxazoline, has been studied within the molecular electron density theory ...
Luis R. Domingo, Mar Ríos-Gutiérrez, Nivedita Acharjee   +2 more
doaj   +1 more source