Results 71 to 80 of about 17,749,413 (318)

First Principle Study on Mg2X (X = Si, Ge, Sn) Intermetallics by Bi Micro-Alloying

open access: yesCrystals, 2021
Being a positive candidate reinforcement material for laminar composites, the Mg2X (X = Si, Ge, Sn) based intermetallics have attracted much attention. The elastic properties, anisotropy, and electronic properties of intermetallic compounds with Bi-doped
Guoning Bai   +4 more
doaj   +1 more source

First Principles

open access: yes, 1897
In 1862, the British philosopher Herbert Spencer (1820–1903) published this preamble to a planned series of publications on biology, psychology, sociology and morality. In it, he states that religion and science can be reconciled by their shared belief in an Absolute, and that ultimate principles can be discerned in all manifestations of the Absolute ...
openaire   +2 more sources

First Principles Theories of Piezoelectric Materials

open access: yes, 2007
Piezoelectrics have long been studied using parameterized models fit to experimental data, starting with the work of Devonshire in 1954. Much has been learned using such approaches, but they can also miss major phenomena if the materials properties are ...
Cohen, R. E.
core   +1 more source

Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM

open access: yesFEBS Letters, EarlyView.
Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley   +1 more source

Hexagonal Zr3X (X = Al, Ga, In) Metals: High Dynamic Stability, Nodal Loop, and Perfect Nodal Surface States

open access: yesFrontiers in Chemistry, 2020
In recent years, topological semimetals/metals, including nodal point, nodal line, and nodal surface semimetals/metals, have been studied extensively because of their potential applications in spintronics and quantum computers.
Heju Xu, Hailong Xi, Yong-Chun Gao
doaj   +1 more source

The First-Principle Study on Tuning Optical Properties of MA2Z4 by Cr Replacement of Mo Atoms in MoSi2N4

open access: yesNanomaterials, 2022
Recently, with the successful preparation of MoSi2N4, an emerging family of two-dimensional (2D) layered materials has been predicted with a general formula of MA2Z4 (M: an early transition metal, A: Si or Ge and Z: N, P, or As).
Yongsheng Li   +9 more
doaj   +1 more source

New ZrB$_2$ polymorphs: First-principles calculations

open access: yes, 2020
Two new hypothetical zirconium diboride (ZrB2) polymorphs: (hP6-P63/mmc space group, no.194) and (oP6-Pmmn-space group, no.59), were thoroughly studied under the first-principles density functional theory calculations from the structural, mechanical and ...
Maździarz, Marcin, Mościcki, Tomasz
core   +1 more source

Mapping the evolution of mitochondrial complex I through structural variation

open access: yesFEBS Letters, EarlyView.
Respiratory complex I (CI) is crucial for bioenergetic metabolism in many prokaryotes and eukaryotes. It is composed of a conserved set of core subunits and additional accessory subunits that vary depending on the organism. Here, we categorize CI subunits from available structures to map the evolution of CI across eukaryotes. Respiratory complex I (CI)
Dong‐Woo Shin   +2 more
wiley   +1 more source

Diversified Phenomena in Metal- and Transition-Metal-Adsorbed Graphene Nanoribbons

open access: yesNanomaterials, 2021
Adatom-adsorbed graphene nanoribbons (GNRs) have gained much attention owing to the tunable electronic and magnetic properties. The metal (Bi, Al)/transition metal (Ti, Fe, Co, Ni) atoms could provide various outermost orbitals for the multi-orbital ...
Shih-Yang Lin   +2 more
doaj   +1 more source

First Principles Study of Zn-Sb Thermoelectrics

open access: yes, 1997
We report first principles LDA calculations of the electronic structure and thermoelectric properties of $\beta $-Zn$_{4}$Sb$_{3}$. The material is found to be a low carrier density metal with a complex Fermi surface topology and non-trivial dependence ...
A. E. Karakosov   +19 more
core   +1 more source

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