Search results for "25"

Experimental investigation of the effects of efficiency promoters in a MSF lab-scale unit

2006

Modelling Nannochloropsis gaditana Growth in Reactors with Different Geometries, Determination of Kinetic Parameters and Biochemical Analysis in Resp…

2022

Microalgae are unicellular and photosynthetic microorganisms which grow thanks to inorganic salts, CO2 and light, and find applications in several fields thanks to their variety. The industrial application of microalgae has not often been fully exploited because of a lack of information about how microalgae respond to inputs and to different growth environments. In the present work a model able to predict the microalgae growth in reactors with different geometries was developed. We combined a Monod-like model for the specific growth rate with the Lambert-Beer law of homogeneous light distribution in thick photobioreactors. Kinetic parameters related to the cultivation of the microalga Nanno…

A geometric approach for predicting vertical stationary profiles of weakly inertial advecting-diffusing particles in closed incompressible flows

2004

Abstract Mixing of weakly inertial particles in closed flows is often addressed by considering individual particles as passive advecting-diffusing tracers, subjected to an additional settling velocity resulting from body forces (e.g. gravity). We show that the qualitative and quantitative features of the vertical particle distribution (i.e. the horizontal cross-sectional averages of particle concentration) can be predicted from the structure of the flow resulting from the superposition of the stirring field and the settling velocity. The prediction is based upon the observation that the resulting flow can be divided into two nonoverlapping regions, namely trajectories that are confined with…

Influence of bundle porosity on shell-side hydrodynamics and mass transfer in regular fiber arrays: A computational study

2023

CFD predictions of the effects of a fiber bundle porosity on shell-side hydrodynamics and mass transfer under conditions of steady laminar flow were obtained. Fluid was assumed to flow around regular hexag-onal or square arrays of cylindrical fibers of different pitch to diameter ratios, yielding bundle porosities ranging from the theoretical minimum up to similar to 1. A large number of axial, transverse and mixed flow combinations were simulated by letting the axial and transverse flow Reynolds numbers and the trans-verse flow attack angle vary. Both fully developed and developing conditions (entrance effects) were con-sidered. The continuity and momentum equations, along with a transport…

Las nuevas formas de movilidad de la población, la especificidad de la familia italiana y la explosión del coronavirus en Lombardía

2021

Conflicto obrero y luchas laborales en el sector logístico del Valle del Po

2021

Spatiotemporal properties of nanoshell plasmonic response for strong-field experiments

2015

International audience; Field enhancement behavior of a SiO 2 /Au nanoshell is studied in the framework of strong-field physics. Localized plasmonic fields induce local electric field enhancement with the potential to lead to the strong-field regime without the use of costly amplified lasers. In this framework, electrons are tunnel ionized from the nanoshell and accelerated by the local field being spatially inhomogeneous in terms of spectral and polarization properties. These processes are happening within a single laser shot, and thermal effects are therefore neglected. We show that the localized response to ultrashort femtosecond pulses can be investigated by extending Mie theory to mult…

Turbulent Fluid Flow in Closed- and Free-Surface Unbaffled Tanks Stirred by Radial Impellers

1996

Zvaigžņotā Debess: 2012, Rudens (217)

2012

Saturs: P.Stučkas LVU ieguldījums astronomijas speciālistu sagatavošanā ; Starp "maldugunīm" un zvaigznēm ; A.Alksnis. Dawn kosmosa misija palīdz atklāt asteroīda Vesta noslēpumus ; D.Docenko. Komentārs: Par Higsa bozona atklāšanu ; I.P. Frīdriha Candera 125.dzimšanas dienai Krievijas Pasts izdevis marku ; P.Leckis. Mākoņu pārklātais pavadonis ; D.Kotlere, I.Šmelds. Kosmisko atlūzu novērojumi Ventspils Starptautiskajā radioastronomijas centrā ; Pirmo reizi “ZvD”: Dace Kotlere ; I.P. Divas dienas, godinot Jāni Ikaunieku (28.IV 1912.–27.IV 1969.) ; I.Pundure. Jāņa Ikaunieka devums Latvijas astronomijai ; N.Cimahoviča, Imants Vilks, R.Saveļjeva, T.Millers, A.Krastiņš. Atmiņas par Ikaunieku ; E…

Zvaigžņotā Debess: 2012, Vasara (216)

2012

Contents: “ZVAIGŽŅOTĀ DEBESS” FORTY YEARS AGO: E.Bervalds. From Intention to Reality (abridged) ; A.Egle. Conceptions of Our Ancestry About Heavenly Bodies and Astronomical Phenomena (abridged) ; NEWS: I.Eglītis. Asteroid Discovered at Baldone Observatory Named after Ikaunieks ; A.Alksnis. ALMA Helps to Study Planetary System of Star Fomalhaut ; A.Alksnis. More than Ten Light-Years Long Filament of Cosmic Dust Discovered ; A.Alksnis. Billions of Rocky Planets in the Milky Way ; SPACE RESEARCH and EXPLORATION: M.Sudārs. The Little Secret Space Shuttle Is Flying! ; M.Sudārs. Too Much Litter! Not in Rubbish Dump, but in the Space! ; “ENERĢIJA un PASAULE” VISITS “ZVAIGŽŅOTĀ DEBESS”: Talk with D…