Properties of seawater and particulate matter from a FRRF instrument, operating in a flow-through mode on the continuous surface water sampling system during the Tara Oceans expedition 2009-2013

The Tara Oceans Expedition (2009-2013) sampled the world oceans on board a 36 m long schooner, collecting environmental data and organisms from viruses to planktonic metazoans for later analyses using modern sequencing and state-of-the-art imaging technologies. Tara Oceans Data are particularly suited to study the genetic, morphological and functional diversity of plankton. The present data set provides continuous measurements made with a FRRF instrument, operating in a flow-through mode during the 2009-2012 part of the expedition. It operates by exciting chlorophyll fluorescence using a series of short flashes of controlled energy and time intervals (Kolber et al, 1998). The fluorescence transients produced by this excitation signal were analysed in real-time to provide estimates of abundance of photosynthetic pigments, the photosynthetic yields (Fv/Fm), the functional absorption cross section (a proxy for efficiency of photosynthetic energy acquisition), the kinetics of photosynthetic electron transport between Photosystem II and Photosystem I, and the size of the PQ pool. These parameters were measured at excitation wavelength of 445 nm, 470nm, 505 nm, and 535 nm, allowing to assess the presence and the photosynthetic performance of different phytoplankton taxa based on the spectral composition of their light harvesting pigments. The FRRF-derived photosynthetic characteristics were used to calculate the initial slope, the half saturation, and the maximum level of Photosynthesis vs Irradiance relationship. FRRF data were acquired continuously, at 1-minute time intervals.

Joint statistical analysis of multiple measurement setups for the estimation of vibrational modes

Computing the modal parameters of large structures in Operational Modal Analysis often requires to process data from multiple non simultaneously recorded setups of sensors. These setups share some sensors in common, the so-called reference sensors that are fixed for all the measurements, while the other sensors are moved from one setup to the next. One possibility is to process the setups separately what result in different modal parameter estimates for each setup. Then the reference sensors are used to merge or glue the different parts of the mode shapes to obtain global modes, while the natural frequencies and damping ratios are usually averaged. In this paper we present a state space model that can be used to process all setups at once so the global mode shapes are obtained automatically and subsequently only a value for the natural frequency and damping ratio of each mode is computed. We also present how this model can be estimated using maximum likelihood and the Expectation Maximization algorithm. We apply this technique to real data measured at a footbridge.

Water Island study : summary report and fiscal analysis.

Study undertaken by Dept. of Commerce, Virgin Islands in response to a request from the U.S. Dept. of Interior.

Planning methodologies for analysis of land use/water quality relationships /

Mode of access: Internet.

The recreation benefits of water quality improvements : analysis of day trips in urban setting /

Mode of access: Internet.

Analysis and GC-MS characterization of toxaphene in fish and water /

Mode of access: Internet.

Ion selective electrodes in water quality analysis /

Mode of access: Internet.

Costs and water quality impacts of reducing agricultural nonpoint source pollution : an analysis methodology /

Aug. 1979.

An economic analysis of solar water & space heating /

"DSE-2322-1."

An analysis of drag coefficient at hurricane windspeeds from a numerical simulation of dynamical water level changes in Lake Okeechobee, Florida /

"October 1975."

Analysis of a power failure incident for the preliminary conceptual design of the small pressurized water reactor /

"Contract No. AT(40-1)-2589."

Empirical analysis of critical mass data involving enriched uranium metal in water /

"Unclassified"--Cover.

Wabash River pollution-abatement needs; recommendations, analysis and data for water conservation by pollution control between Terre Haute, Ind., and Mt. Carmel, Ill.

Mode of access: Internet.