Results 61 to 70 of about 372,156 (218)

When Does Alzheimer's Disease Start? Plasma Aβ42/40 Assays Show Steep Changes at Aβ‐PET Centiloid 15, Mean Age of 66 Years

open access: yesAnnals of Neurology, EarlyView.
Objective Sporadic late‐onset Alzheimer's disease (AD) is characterized by a long pre‐clinical phase where amyloid‐beta (Aβ) and tau begin to accumulate in the brain. The primary objective was to determine the age at which AD starts by finding the average population age when both positron emission tomography (PET) Aβ (Aβ‐PET) and plasma Aβ42/40 become ...
Rodrigo Cánovas   +29 more
wiley   +1 more source

Microwave Background Anisotropies in Primeval Isocurvature Baryon Models: Constraints on the Cosmological Parameters

open access: yes, 1993
We have performed the most comprehensive predictions of the temperature fluctuations \dtt in the primeval isocurvature baryon models to see whether or not the models are consistent with the recent data on the cosmic microwave background anisotropies ...
Chiba, Takashi   +2 more
core   +1 more source

Estudio sobre el incremento de créditos en las instituciones financieras privadas en el Ecuador

open access: yesInnova Research Journal, 2017
Las instituciones financieras juegan un rol muy importante en la economía nacional, siendo estas la fuente de desarrollo económico y de inversión, es por esto que la presente investigación muestra el nivel crediticio de las instituciones privadas en el ...
Juan Carlos Muñoz Briones   +1 more
doaj   +1 more source

El uso del Internet y su relación con el crecimiento económico: Análisis para Nicaragua

open access: yesRevista Científica Profundidad Construyendo Futuro, 2023
En los últimos años el Internet ha jugado un rol importante en la dinámica de la economía de los países, por tal motivo, el presente trabajo denominado “El uso del Internet y su relación con el crecimiento económico: Análisis para Nicaragua” tuvo como ...
Humberto Antonio Brenes - González
doaj   +1 more source

Cardinality of Rauzy classes [PDF]

open access: yes, 2011
Rauzy classes define a partition of the set of irreducible (or indecomposable) permutations. They were defined by G. Rauzy as part of an induction algorithm for interval exchange transformations.
Delecroix, Vincent
core   +3 more sources

Insight Into the Failure Mechanism of Conversion‐Alloy Anode Materials in Potassium‐Ion Batteries: A Case Study of Bi2Te3

open access: yesCarbon Energy, EarlyView.
Through combining electrochemical profiles with multi‐scale microscopies, spectroscopy, and theoretical calculations, the failure processes and mechanisms of Bi2Te3 are identified into two stages: (1) the shuttle effect, dominating the first stage, results in the rapid capacity fading in the first several cycles and (2) the SEI accumulation, dominating
Hehe Zhang   +7 more
wiley   +1 more source

Desastres naturales y crecimiento económico: una síntesis de la evidencia empírica

open access: yesNóesis, 2022
Los desastres naturales representan una grave amenaza a nivel mundial y, a futuro, se espera que su frecuencia y severidad aumenten debido al cambio climático.
Fernando Antonio Ignacio Gonza\u0301lez
doaj   +1 more source

Twenty‐Minute Microwave‐Enabled Dual‐Anion Nickel Sulfoselenide Anodes for High‐Capacity Sodium/Potassium‐Ion Batteries and Durable Pouch Cells

open access: yesENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A dual‐anion‐assisted strategy is proposed for designing bi‐functional high‐performance anodes. The preparation of NiSSe/N‐C within 20 min demonstrates rapid Na+/K+ reaction kinetics, exceptional rate capability, and remarkable cycling stability. Nickel‐based materials are promising anode candidates for sodium‐ion batteries and potassium‐ion batteries ...
Yayun Zheng   +6 more
wiley   +1 more source

DIRECTIONS OF CHANGES OF GRAINS PRODUCTION IN POLAND [PDF]

open access: yesAnnals of the Polish Association of Agricultural and Agribusiness Economists, 2017
The aim of this study was to present changes in the tendency of the cereals production in Poland. Asa source material for this analysis, statistical data from GUS (1950-2015) were used. In the analyzedperiod, the expansion of the cultivation of wheat and
Bogusława Jaśkiewicz, Alicja Sułek
doaj   +1 more source

A Review of Black Phosphorus‐Based Materials: From Preparation Strategies to Characterization Techniques

open access: yesENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
The structure, properties, preparation methods, and characterization techniques of BP. As a typical 2D layered material, black phosphorus (BP) demonstrates exceptional promise in various fields, particularly in energy storage for alkali metal‐ion batteries. However, its distinctive structure and properties, together with the compositional complexity of
Yunqing Wang   +7 more
wiley   +1 more source

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