Results 91 to 100 of about 99,009 (221)

Seasonal Changes in Marine Archaeal Tetraether Lipid Export Depth Linked to Net Primary Productivity

Paleoceanography and Paleoclimatology, Volume 41, Issue 2, February 2026.
Abstract Marine ammonia oxidizing archaea (AOA) produce isoprenoid glycerol dibiphytanyl glycerol tetraethers (GDGTs) which form the basis of seawater temperature proxy TEX86. Although most studies use TEX86 for sea surface temperature (SST) reconstructions, maximum GDGT production occurs at and below the nitracline. Moreover, sedimentary GDGT‐2/GDGT‐3
Addison Rice, Eunmi Park, Gesine Mollenhauer, Daisy Bouwmans, Anouk van Boxtel, Gert J. de Lange, Ryan Paul, Francesca Sangiorgi, Ryan Smulders, Jan‐Berend Stuut, Martin Ziegler, Appy Sluijs, Francien Peterse   +12 more
wiley   +1 more source

Track Bed Gaps Impact on Ballast Particle Surrounding Flow Field and Aerodynamic Forces for High-speed Railways before and after Ballast Splashing

Chengshi guidao jiaotong yanjiu
[Objective] When high-speed trains operate on ballasted tracks, the complex airflow field around ballast particles can lead to track ballast splashing. The formation mechanism of this phenomenon remains unclear.
WANG Jiankai, ZHU Jianyue, JI Jingwen, LU Yanhong   +3 more
doaj   +1 more source

Stress–Dilatancy For Crushed Latite Basalt

Studia Geotechnica et Mechanica, 2018
In this article, the stress–dilatancy relationship for crushed latite basalt is analysed by using Frictional State Theory. The relationship is bilinear, and the parameters α and β determine these two straight lines.
Dołżyk-Szypcio Katarzyna
doaj   +1 more source

Sub-collision hyperfine structure of nonlinear-optical resonance with field scanning

, 2004
Some experimental evidences for methane are produced that the simple transition from frequency scanning of nonlinear-optical resonances to magnetic one may be accompanied with transition from sub-Doppler collisionally broadened structure to sub-collision
A.G. Rudavets, Abramowitz, Alexandrov, Anderson, Appleman, Badalyan, Badalyan, Badalyan, Bagaev, Bagaev, Barger, Biedenharn, Bronshtein, Chebotayev, Dang-Nhu, Eck, Eck, Fedorov, Flygare, Flygare, Flygare, Gantmacher, Garetz, Gierke, Gus’kov, Gus’kov, Hall, Ilisca, K.I. Gus’kov, Korn, Landau, Lankaster, Letokhov, Magyar, Mamford, Messiah, Michelot, Pokazanev, Rautian, Schubert, Sheffield, Shen, Shimoda, Smirnov, Sobel’man, Stenholm, Tchek-de, Uzgiris, V.I. Kovalevsky, Yi, É.G. Saprykin   +50 more
core   +1 more source

Properties and Limitations of eDNA Substrates for Terrestrial Animal Monitoring

Molecular Ecology Resources, Volume 26, Issue 2, February 2026.
ABSTRACT Environmental DNA (eDNA) constitutes a valuable tool for monitoring terrestrial animal diversity, but outcomes are affected by multiple factors. Among these factors, the choice of sampling substrate and method is especially important and must be aligned with research objectives.
Beilun Zhao, Tobias Andermann
wiley   +1 more source

A dynamic model of ballasted rail track with bituminous sub-ballast layer [PDF]

, 2012
The bituminous sub-ballast layer within the ballasted rail track allows some mechanical and environmental advantages. An analytical model of a ballasted rail track with sub-ballast layer has been proposed by considering the rail as viscous-elastic ...
Di Liberto, CM, DI MINO, Gaetano, Maggiore, C, NOTO, Silvia   +3 more
core   +1 more source

Ecological, Functional, and Phylogenetic Determinants of Cyanobacterial Biomineralisation

Environmental Microbiology Reports, Volume 18, Issue 1, February 2026.
Cyanobacteria contribute to the global carbon cycle by biomineralising CO2 into solid carbonates. Unlike photosynthesis, biomineralisation is a less‐understood, multifaceted and adaptive metabolic process with significant global impact. It involves cell wall structures, genetic factors, and metabolic pathways that enable mineral formation and help ...
Federica Tiddia, Sandeesha Kodru, Dario Piano, Domenica Farci   +3 more
wiley   +1 more source

Photovoltaic System For Supplying Public Lighting As Peak Demand Shaving

Eletrônica de Potência, 2007
This paper describes the design and implementation of a grid connected photovoltaic system aimed to supply energy to the public lighting during the time of high peak demand of the grid. The system is made of two main parts: the solar energy storage unit
Edilson Mineiro Sá Jr., Sergio Daher, Fernando L. M. Antunes, Cícero M. T. Cruz, Kátia M. Silva, A. Ribamar Figueira   +5 more
doaj   +1 more source

Unravelling echinoid mass mortalities: a global overview of mechanisms, spatio‐temporal trends, and taxonomic insights

Biological Reviews, Volume 101, Issue 1, Page 221-236, February 2026.
ABSTRACT Mass mortality events (MMEs) have been occurring since the dawn of time. However, in contrast to terrestrial events, most marine MMEs remain undetected, largely due to the inaccessibility of many marine environments. One of the most notorious and best‐studied marine MMEs in modern times is that of the population collapse of the echinoid ...
Lisa‐Maria Schmidt, Guillermo Anderson Benaim, Omri Bronstein   +2 more
wiley   +1 more source

Symmetrical angle switched single-phase and three-phase rectifiers: application to micro hydro power plants [PDF]

, 2019
Micro-size hydro power plants are commonly used at remote areas to supply islanded AC microgrids. A typical way to control grid frequency is to manipulate active power dissipated in ballast loads by AC/AC converters.
Bory Prevez, Henry, Majanne, Yrjö, Martínez García, Herminio, Vazquez Seisdedos, Luis   +3 more
core