scholarly journals Comparative Resin Kinetics Using in Situ Fluorescence Measurements

2002 ◽  
Vol 4 (5) ◽  
pp. 540-540
Author(s):  
Daniel P. Walsh ◽  
Christopher Pang ◽  
Puja B. Parikh ◽  
Young-Soo Kim ◽  
Young-Tae Chang
Keyword(s):  
Fluorescence Measurements

scholarly journals Statistical approach for the retrieval of phytoplankton community structures from in situ fluorescence measurements

2016 ◽  
Vol 24 (21) ◽  
pp. 23635 ◽  
Author(s):  
Shengqiang Wang ◽  
Cong Xiao ◽  
Joji Ishizaka ◽  
Zhongfeng Qiu ◽  
Deyong Sun ◽  
...  
Keyword(s):  
Statistical Approach ◽  
Phytoplankton Community ◽  
Community Structures ◽  
Fluorescence Measurements

Surface layer variability in the Ross Sea, Antarctica as assessed by in situ fluorescence measurements

2011 ◽  
Vol 88 (1-4) ◽  
pp. 28-45 ◽  
Author(s):  
Walker O. Smith ◽  
Vernon Asper ◽  
Sasha Tozzi ◽  
Xiao Liu ◽  
Sharon E. Stammerjohn
Keyword(s):  
Surface Layer ◽  
Ross Sea ◽  
Fluorescence Measurements

scholarly journals Environmental Forcing of Red Tides in the Southern Benguela

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Mark R. Jury
Keyword(s):  
Climate Model ◽  
Late Summer ◽  
Temperature Inversion ◽  
Lower Atmosphere ◽  
Red Tides ◽  
Environmental Forcing ◽  
Fluorescence Measurements ◽  
Cape Peninsula ◽  
Dominant Feature

The Southern Benguela cape upwelling plumes have inshore wind shadows prone to red tides in late summer. Their intensity and coverage are estimated by satellite fluorescence measurements in the period 1997–2012 and qualified by in situ reports. High satellite fluorescence cases are identified at daily to seasonal time scales, and characteristics of the upper ocean and lower atmosphere are studied using third generation reanalyses. A dominant feature is easterly winds over the Cape Peninsula (34°S, 18°E) induced by a ridging anticyclone-coastal low weather pattern. Over Cape Columbine (33°S), there is a wind shadow with cyclonic wind and current shear. Composite atmospheric profiles reveal a 4°C temperature inversion near 500 m that traps a coastal wind jet >6 m/s below 200 m. The composite shelf oceanography shows a relic upwelling plume below 10 m overtopped by warmer water near the coast, providing the thermal stratification needed for biotic aggregation. Data from the IPSL5 coupled climate model over the period 1980–2080 indicates that environmental conditions favoring red tides may become more frequent.

Temporally and Spatially Resolved x-ray Fluorescence Measurements of in-situ Drug Concentration in Metered-Dose Inhaler Sprays

2015 ◽  
Vol 33 (4) ◽  
pp. 816-825 ◽  
Author(s):  
Daniel J. Duke ◽  
Alan L. Kastengren ◽  
Nicholas Mason-Smith ◽  
Yang Chen ◽  
Paul M. Young ◽  
...  
Keyword(s):  
Drug Concentration ◽  
Dose Inhaler ◽  
Metered Dose Inhaler ◽  
X Ray ◽  
Spatially Resolved ◽  
Fluorescence Measurements ◽  
Metered Dose

scholarly journals Anions Enhance Rare Earth Adsorption at Negatively Charged Surfaces

2020 ◽  
Author(s):  
Srikanth Nayak ◽  
Kaitlin Lovering ◽  
Wei Bu ◽  
Ahmet Uysal
Keyword(s):  
Rare Earth ◽  
Electrostatic Interactions ◽  
Aqueous Interfaces ◽  
Charged Surfaces ◽  
Complex Processes ◽  
Specific Effects ◽  
Fluorescence Measurements ◽  
Adsorption Surface ◽  
Trivalent Rare Earth

Anions are expected to be repelled from negatively charged surfaces. At aqueous interfaces, however, ion-specific effects can dominate over direct electrostatic interactions. Using multiple <i>in situ</i> surface sensitive experimental techniques, we show that surface affinity of SCN<sup>-</sup> ions are so strong that they can adsorb at a negatively charged floating monolayer at the air/aqueous interface. This extreme example of ion-specific effects may be very important for understanding complex processes at aqueous interfaces, such as chemical separations of rare earth metals. Adsorbed SCN<sup>-</sup> ions at the floating monolayer increase the overall negative charge density, leading to enhanced trivalent rare earth adsorption. Surface sensitive X-ray fluorescence measurements show that the surface coverage of Lu<sup>3+</sup> ions can be triple of the apparent surface charge of the floating monolayer in the presence of SCN<sup>-</sup>. Comparison to NO<sub>3</sub><sup>-</sup> samples show that the effects are strongly dependent to the character of the anion, providing further evidence to ion-specific effects dominating over electrostatics.

Corrections for matrix effects on fluorescence measurement of a multi-platform optical sensor

2016 ◽  
Vol 11 (3) ◽  
pp. 644-660 ◽  
Author(s):  
Chee-Loon Ng ◽  
Yan-Jie Ng ◽  
Qing-Qing Chen ◽  
Harold F. Hemond
Keyword(s):  
Matrix Effect ◽  
Optical Sensor ◽  
Matrix Effects ◽  
Fluorescence Measurement ◽  
Optical Instrument ◽  
Laboratory Sample ◽  
Physical Conditions ◽  
Fluorescence Measurements ◽  
Improve Accuracy

The LEDIF (LED-induced fluorescence) is an in situ optical instrument that utilizes fluorescence, absorbance, and scattering to identify and quantify substances in water bodies. In this study, matrix effects on fluorescence signals caused by inner filtering, temperature, intramolecular deactivation, turbidity, and pH were investigated, and compensation equations developed to correct measured values and improve accuracy. Multiple simultaneous matrix effect corrections were demonstrated with a laboratory sample subjected to known interferences and physical conditions. In general, compensation was found to be important to improve the accuracy of fluorescence measurements.

scholarly journals In situ fluorescence measurements of dissolved organic matter: A review

2020 ◽  
Vol 699 ◽  
pp. 134361 ◽  
Author(s):  
Elfrida M. Carstea ◽  
Cristina L. Popa ◽  
Andy Baker ◽  
John Bridgeman
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Fluorescence Measurements

In situ differentiation between nevi and malignant melanomas by fluorescence measurements

1991 ◽  
Vol 78 (10) ◽  
pp. 456-457 ◽  
Author(s):  
W. Lohmann ◽  
M. Nilles ◽  
R. H. B�deker
Keyword(s):  
Malignant Melanomas ◽  
Fluorescence Measurements
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