Results 101 to 110 of about 6,922,047 (309)

Time History Analysis of a Steel Water Tank with Pinned and Fixed Foundations under Varying Ground Perturbations

open access: yesNigerian Journal of Technological Development, 2018
Earthquake is a natural phenomenon which is caused by sudden release of energy in the Earth's crust that creates seismic waves. Seismic response of an overhead water tank with varying foundation types subjected to five different earthquake accelerograms ...
S. O. Odeyemi   +3 more
doaj   +1 more source

Reconstructing the Star Formation History of the Galaxy

open access: yes, 2000
The evolution of the star formation rate in the Galaxy is one of the key ingredients quantifying the formation and determining the chemical and luminosity evolution of galaxies.
CC Lin   +7 more
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

Influence of the Brace Configurations on the Seismic Performance of Steel Concentrically Braced Frames

open access: yesFrontiers in Built Environment, 2019
Concentrically braced frame (CBF) is an effective and prevalent seismic force resisting system which is commonly used in low-rise buildings. This type of structural system utilizes steel braces to provide the stiffness and strength needed to dissipate ...
T. Y. Yang   +3 more
doaj   +1 more source

Negative Group Velocity [PDF]

open access: yes, 2000
The group velocity for pulses in an optical medium can be negative at frequencies between those of a pair of laser-pumped spectral lines. The gain medium then can amplify the leading edge of a pulse resulting in a time advance of the pulse when it exits ...
Hamilton W. R., Kirk T. McDonald
core   +4 more sources

An intracellular transporter mitigates the CO2‐induced decline in iron content in Arabidopsis shoots

open access: yesFEBS Letters, EarlyView.
This study identifies a gene encoding a transmembrane protein, MIC, which contributes to the reduction of shoot Fe content observed in plants under elevated CO2. MIC is a putative Fe transporter localized to the Golgi and endosomal compartments. Its post‐translational regulation in roots may represent a potential target for improving plant nutrition ...
Timothy Mozzanino   +7 more
wiley   +1 more source

Behavior of composite rigid frame bridge under bi-directional seismic excitations

open access: yesJournal of Traffic and Transportation Engineering (English ed. Online), 2014
Pushover analysis and time history analysis are conducted to explore the bi-directional seismic behavior of composite steel-concrete rigid frame bridge, which is composed of RC piers and steel-concrete composite girders.
Xiaogang Liu   +3 more
doaj   +1 more source

Evolution of the discrepancy between a universe and its model [PDF]

open access: yes, 2001
We study a fundamental issue in cosmology: Whether we can rely on a cosmological model to understand the real history of the Universe. This fundamental, still unresolved issue is often called the ``model-fitting problem (or averaging problem) in ...
Chavel I   +10 more
core   +2 more sources

By dawn or dusk—how circadian timing rewrites bacterial infection outcomes

open access: yesFEBS Letters, EarlyView.
The circadian clock shapes immune function, yet its influence on infection outcomes is only beginning to be understood. This review highlights how circadian timing alters host responses to the bacterial pathogens Salmonella enterica, Listeria monocytogenes, and Streptococcus pneumoniae revealing that the effectiveness of immune defense depends not only
Devons Mo   +2 more
wiley   +1 more source

Home - About - Disclaimer - Privacy