Results 31 to 40 of about 1,164,049 (249)

Temporal and spatial variation of limnological variables and biomass of different macrophyte species in a Neotropical reservoir (São Paulo - Brazil) [PDF]

, 2013
Aim: This study reports an investigation of limnological characteristics and aquatic macrophyte occurrence in a neotropical reservoir in order to assess the spatio-temporal variation of water and sediment variables and their influence on plant ...
Bottino, Flávia, Calijuri, Maria do Carmo, Murphy, Kevin Joseph   +2 more
core   +2 more sources

Configurational temperature control for atomic and molecular systems [PDF]

, 1994
A new configurational temperature thermostat suitable for molecules with holonomic constraints is derived. This thermostat has a simple set of motion equations, can generate the canonical ensemble in both position and momentum space, acts homogeneously ...
Braga, C., Travis, K.P.
core   +6 more sources

Regional averaging and scaling in relativistic cosmology [PDF]

, 2002
Averaged inhomogeneous cosmologies lie at the forefront of interest, since cosmological parameters like the rate of expansion or the mass density are to be considered as volume-averaged quantities and only these can be compared with observations.
Buchert, Thomas, Carfora, Mauro
core   +3 more sources

Temporal and spatial variability of terrestrial diatoms at the catchment scale: controls on communities

PeerJ, 2020
Diatoms are generally regarded as inhabitants of water bodies. However, numerous taxa are able to survive and reproduce in a variety of non-aquatic ecosystems. Although terrestrial diatoms are discussed extensively in the literature, most of those studies covered floristic aspects and few information exists on their ecology.
Foets, Jasper, Wetzel, Carlos E., Teuling, Adriaan J., Pfister, Laurent   +3 more
openaire   +4 more sources

On robust stability of switched homogeneous systems

IET Control Theory & Applications, 2021
This paper analyses the robust stability of a class of homogeneous systems where a relation among the high‐order term, the decay rate and the domain of attraction of the system is explicitly established.
Hao Yang, Dong Zhao, Bin Jiang, Shihong Ding   +3 more
doaj   +1 more source

Factors Controlling the Spatial Variability of Mercury Distribution in Spanish Topsoil

Soil and Sediment Contamination: An International Journal, 2008
This study characterized the sources and scales of mercury variability in agricultural soils of the river Ebro (9.5 million ha) using geostatistical methods and data from 624 samples. The Ebro basin (20% of Spanish land mass) is an important agricultural area that is industrialized.
Rodríguez Martín, José Antonio, Vázquez De La Cueva, Antonio, Grau, José M., Martínez-Alonso, Celia, López Arias, Manuel   +4 more
openaire   +4 more sources

Optimal Control of Molecular Motion Expressed Through Quantum Fluid Dynamics [PDF]

, 2000
A quantum fluid dynamic control formulation is presented for optimally manipulating atomic and molecular systems. In quantum fluid dynamic the control quantum system is expressed in terms of the probability density and the quantum current. This choice of
A. Assion, A. Assion, A. P. Peire, A. Shnitman, Attila Askar, Bijoy K. Dey, Bijoy K. Dey, C. C. Marston, C. J. Bardeen, D. Bohm, D. Bohm, D. Bohm, D. J. Tannor, D. J. Tannor, D. J. Tannor, F. S. Mayor, G. G. Balint-Kurti, G. G. Balint-Kurti, G. Q. Xing, H. Rabitz, Herschel Rabitz, J. Botina, J. Cao, J. F. Olgilvie, J. L. Herek, J. P. Boris, P. Brumer, P. Brumer, R. Demiralp, R. Kosloff, R. Löhner, R. S. Judson, S. A. Rice, S. Shi, S. Shi, T. Baumert, V. D. Kleiman, W. H. Press, W. Zhu, Y. Ohtsuki   +39 more
core   +3 more sources

Gravity compensation and optimal control of actuated multibody system dynamics

IET Control Theory & Applications, 2022
This work investigates the gravity compensation topic, from a control perspective. The gravity could be levelled by a compensating mechanical system or in the control law, such as proportional derivative (PD) plus gravity, sliding mode control, or ...
Saeed Rafee Nekoo, José Ángel Acosta, Anibal Ollero   +2 more
doaj   +1 more source

Water Flow Controls the Spatial Variability of Methane Emissions in a Northern Valley Fen Ecosystem [PDF]

Biogeosciences, 2020
Abstract. Northern peatlands are projected to be crucial in future atmospheric methane (CH4) budgets and have a positive feedback on global warming. Fens receive nutrients from catchments via inflowing water and are more sensitive than bogs to climate change-caused variations in their ecohydrology.
H. Zhang, H. Zhang, E.-S. Tuittila, A. Korrensalo, A. Räsänen, A. Räsänen, T. Virtanen, T. Virtanen, M. Aurela, T. Penttilä, T. Laurila, S. Gerin, V. Lindholm, A. Lohila, A. Lohila   +14 more
openaire   +5 more sources

Spatial and temporal variability in cyanobacterial populations controlled by physical processes [PDF]

Journal of Plankton Research, 2004
The Fitzroy impoundment is a long slender water body (10 m deep) formed by the regulation of the Fitzroy River in tropical Australia. Large, monsoonally driven discharges in late summer flush the impoundment repeatedly leaving, after 2 months, a longitudinally uniform, well-mixed water column, rich in dissolved nutrients and with high turbidity.
Bormans, Myriam., Ford, Phillip., Fabbro, Larelle D.   +2 more
openaire   +2 more sources