Øyvind Andreassen's research while affiliated with University of Massachusetts Amherst and other places

... Current research efforts focus on the development of improved superhydrophobic surfaces and on their application on macroscopic scales (Greidanus, Delfos & Westerweel 2011;Gruncell, Sandham & Prince 2012b), e.g. to the coating of watercraft and the lining of pipes. Elboth et al. (2012) recently demonstrated that superhydrophobic coatings can reduce drag on towed streamer cables. ...

... The absorbance of the whole-cell suspensions was adjusted with PBS to an optical density of approximately 0.4 at 650 nm and these were stored at 4 ° C. Two microlitres of the suspensions were dotted on 0.5 ϫ 10 cm nitrocellulose strips, as described previously [13], before incubation overnight at room temperature with the Mabs diluted in PBS with 3% bovine serum albumin. The Mabs used were Lp1, 3/1, 3, 8/4, 20/1, 10/6, and 26/1 for serogroup 1 subgroups and those against serogroups 2, 3,6,7,8,9,10,11,12,14,and 15. Antibody binding was detected with rabbit anti-mouse immunoglobulin conjugated to horseradish peroxidase (Dako AS, Denmark). ...

... Streamers form part of seismic arrays used in the geophysical exploration industry and have robust polyurethane (PU) coverings which protect sensitive electronic equipment for recording seismic signals (Harrick & Stenzel 2011). Streamers are towed at a pre-set depth between 5 and 7 m at speeds of between 4 and 5.5 knots and record seismic feedback from subsurface strata to identify offshore oil and gas bearing geological features (Elboth et al. 2010). In these remote offshore environments, pelagic goose barnacles are a major fouling organism settling on seismic streamer skins, resulting in dense mono-specific communities which cause equipment failure and a reduction in the quality of the seismic data (Harper 1995;Vignaux 2010). ...

... We performed FWI taking into account a noiseless data scenario, to validated our algorithms, and three noisy data scenarios: in the first two, we consider a dataset polluted by Gaussian noise, and then, in the last one, we use a seismic dataset contaminated by spiky-noise (outliers) and Gaussian noise to simulate a realistic circumstance like to Ref. [78]. In the case of the first two scenarios, we consider seismic data contaminated by white Gaussian background noise with signal-to-noise ratio (SNR) of 70dB and 60dB, respectively, as depicted in 3(b) and 3(c). ...

... return λ j , a j , ϑ j , c 0 14: end function Pobitzer et al's work [21] deals with an extension of POD based on feature detectors. The visualization of POD components and the additional use of feature detectors do not take spatio-temporal properties of the decomposition into account, which is again the main difference to our DMD approach. ...

... In the case of spectral and finite elements, some SGS models were not originally designed with LES in mind but, rather, as a way to stabilize the continuous Galerkin numerical solution of advection dominated problems (e.g. [28,29,30,31,32]). As a by-product, they also proved to be effective for turbulence modeling. ...

... The underlying constraint cannot be strictly satisfied by turbulence in the atmospheric boundary layer. For stably stratified shear flows, a state of isotropy has proved elusive even for very small-scale motions in the dissipation subrange of turbulence, where anisotropic eddies may prevail (see, e.g., Durbin and Speziale 1991;Thoroddsen and Van Atta 1992;Smyth and Moum 2000;Pettersson Reif and Andreassen 2003). Moreover, any dissimilar behaviours underlying momentum and heat transport indicate a deviation from the simplistic Reynolds analogy, and dissimilar behaviours underlying heat and moisture transport indicate a deviation from the Lewis analogy (Li and Bou-Zeid 2011;Li et al. 2012). ...

... Estas bacterias crecen mejor en agua caliente, como la que se encuentra en bañeras de hidromasaje o jacuzzis, torres de refrigeración (unidades de aire acondicionado para edificios grandes), tanques de agua caliente, y sistemas de plomería grandes. La enfermedad muestra una distribución mundial con representación en América del Norte, Sudamérica, Asia, África, Australia y Europa (39)(40)(41) . ...

... Notably, these three bacterial genera may also be airborne pathogens. Blatny et al. (2008) observed that Legionella spp. were detected up to 200 m downwind from the aeration ponds of a sewage treatment plant [49]. ...

... Various aspects of the supporting vorticity can and have been visualized using vorticity lines, two-dimensional vorticity contours over streaks and three dimensional vorticity isosurfaces. [16][17][18][19][20][21][22][23] It is also visible as shear layers in two-dimensional (2D) velocity quiver plots where rotational patterns may sometimes 17,24,25 (but not always 26,27 ) be attributable to hairpins. ...