Results 71 to 80 of about 456,086 (291)

A Fluorescent and Colorimetric Chemosensor for Hg2+ Based on Rhodamine 6G With a Two-Step Reaction Mechanism

Frontiers in Chemistry, 2020
A fluorescent and colorimetric chemosensor L based on rhodamine 6G was designed, synthesized, and characterized. Based on a two-step reaction, the chemosensor L effectively recognized Hg2+.
Cui-Bing Bai, Cui-Bing Bai, Wei-Gang Wang, Jie Zhang, Chang Wang, Chang Wang, Rui Qiao, Rui Qiao, Biao Wei, Biao Wei, Lin Zhang, Lin Zhang, Shui-Sheng Chen, Shui-Sheng Chen, Song Yang, Song Yang   +15 more
doaj   +1 more source

A Spherical Non-LTE Line-Blanketed Stellar Atmosphere Model of the Early B Giant epsilon CMa [PDF]

, 1998
We use a spherical non-LTE fully line blanketed model atmosphere to fit the full multi-wavelength spectrum, including the extreme ultraviolet (EUV) continuum observed by the {\it Extreme Ultraviolet Explorer}, of the B2 II star \epscma. The available spectrophotometry of \epscma\ from 350 \AA\ to 25 \micron\ is best fit with model parameters \Teff ...
arxiv   +1 more source

A FEROS spectroscopic study of the extreme O supergiant He 3-759

, 2009
We present a study of the extreme O-type supergiant He 3-759 using new high-resolution FEROS data, revealing that it is a near spectroscopic twin of HD 151804 (O8 Iaf).
Arnaboldi, Benjamin, Bohannan, C. J. Evans, Caldwell, Carlson, Conti, Crowther, Crowther, Crowther, de Winter, Drew, Hadfield, Henize, Herbig, Hillier, Hillier, Humphreys, Kaufer, Lanz, Leitherer, Lejeune, Meynet, Meynet, Najarro, P. A. Crowther, Parker, Prinja, Reid, Roberts, Shore, Snow, Thé, Walborn, Witham   +34 more
core   +1 more source

Theoretical Clues to the Ultraviolet Diversity of Type Ia Supernovae [PDF]

, 2015
The effect of metallicity on the observed light of Type Ia supernovae (SNe Ia) could lead to systematic errors as the absolute magnitudes of local and distant SNe Ia are compared to measure luminosity distances and determine cosmological parameters.
Baron, E., Brown, Peter J., Milne, Peter, Roming, Peter W. A., Wang, Lifan   +4 more
core   +3 more sources

Improvement of the Method for Determining Total Nitrogen in Water Quality Using Alkaline Potassium Persulfate Ultraviolet Spectrophotometry

Yankuang ceshi
Alkaline potassium persulfate (K2S2O8) ultraviolet (UV) spectrophotometry is the routine method to analyze total nitrogen (TN) in water and is important for studying pollutants in water and the geochemical cycling of TN.
Zhenchao LIU, Zhixiong LI, Qianshu LU, Xiaona WANG, Song ZHANG, Yaohua HU   +5 more
doaj   +1 more source

The New Generation Atlas of Quasar Spectral Energy Distributions from Radio to X-rays [PDF]

, 2011
We have produced the next generation of quasar spectral energy distributions (SEDs), essentially updating the work of Elvis et al. (1994) by using high-quality data obtained with several space and ground-based telescopes, including NASA's Great ...
Baitian Tang, Barvainis, Benjamin J. Kelly, Beverley J. Wills, Brinkmann, Brinkmann, Cohen, Condon, D. Wills, Dale, Dale, Daniel A. Dale, de Bruyn, Dean C. Hines, Diamond-Stanic, Evans, Gallagher, Gear, Gerard A. Kriss, Glikman, Gower, Grupe, Hao, Hiner, Houck, Jessie C. Runnoe, Jester, Jun Li, Kriss, Kuraszkiewicz, Kuraszkiewicz, Laor, Large, Large, McLeod, McLeod, Michael S. Brotherton, Moos, Netzer, Peng, Pereira-Santaella, Pilkington, Polletta, Polletta, Rajib Ganguly, Richard F. Green, Richards, Rieke, Risaliti, Rodrigo S. Nemmen, Sabrina L. Cales, Sambruna, Sarah C. Gallagher, Schlegel, Schweitzer, Shang, Shang, Shang, Shi, Siemiginowska, Skrutskie, Strateva, Tavecchio, Telfer, Tommasin, Ulvestad, Vanden Berk, Weedman, Werner, Wilkes, Yanxia Xie, Yuan, Zhaohui Shang, Zheng, Zheng   +74 more
core   +2 more sources

Angular Sizes and Effective Temperatures of O-type Stars from Optical Interferometry with the CHARA Array [PDF]

Kathryn D. Gordon et al. 2018 ApJ 869 37, 2018
We present interferometric observations of six O-type stars that were made with the Precision Astronomical Visible Observations (PAVO) beam combiner at the Center for High Angular Resolution Astronomy (CHARA) Array. The observations include multiple brackets for three targets, $\lambda$~Ori~A, $\zeta$~Oph, and 10~Lac, but there are only preliminary ...
arxiv   +1 more source

Ultraviolet spectrophotometry of theophylline in plasma in the presence of barbiturates.

Clinical Chemistry, 1975
Ultraviolet spectrophotometry is widely used for the analysis of theophylline in blood, for purposes of monitoring therapy, and for pharmacokinetic studies.
P. Jatlow
semanticscholar   +1 more source

Analytical method development of pitavastatin-loaded SNEDDS formulation: Multivariate analysis regarding ultraviolet spectrophotometry analysis

Journal of Food and Pharmaceutical Sciences, 2019
Herein, this work aimed to develop and assess feasibility of multivariate model of partial least square analysis for specific quantification of pitavastatin (PVT)-loaded self-nano emulsion (SNE) formulation using UV Vis spectrophotometry. PVT loaded into
Kuncahyo I, Choiri S, Fudholi A, Abdul Rohman, Ronny Martien   +4 more
doaj   +1 more source

Determination of Nicotine in Libyan Smokers and Nonsmokers’ Urine samples by Ultraviolet-Visible Spectrophotometry

مجلة العلوم البحتة والتطبيقية, 2020
This study was aimed to determine the nicotine in Libyan smokers and nonsmokers ’urine. Twenty urine samples are collected from smokers and nonsmokers. Each volunteer was required to complete a questionnaire before providing the urine sample. The samples
Galal M. Elmanfe, Suad K. Omar , Ahmad B. Eznien
doaj   +1 more source