Results 21 to 30 of about 562,749 (241)

Predicting the UV–vis spectra of oxazine dyes

Beilstein Journal of Organic Chemistry, 2011
In the current work we have investigated the ability of time-dependent density functional theory (TD-DFT) to predict the absorption spectra of a series of oxazine dyes and the effect of solvent on the accuracy of these predictions.
Scott Fleming, Andrew Mills, Tell Tuttle
doaj   +1 more source

Data Fusion of UV-Vis and FTIR Spectra Combined with Principal Component Analysis for Distinguishing of Andrographis paniculata Extracts Based on Cultivation Ages and Solvent Extraction

Indonesian Journal of Chemistry, 2021
Andrographis paniculata is one of the medicinal plants used for the treatment of antidiabetic. Cultivation ages and solvent extraction affected metabolites' composition and concentration that directly cause the plant's efficacies.
Antonio Kautsar, Wulan Tri Wahyuni, Utami Dyah Syafitri, Syifa Muflihah, Nursifa Mawadah, Eti Rohaeti, Zulhan Arif, Bambang Prajogo, Muhammad Bachri Amran, Abdul Rohman, Mohamad Rafi   +10 more
doaj   +1 more source

A comparative analysis of the UV/Vis absorption spectra of nitrobenzaldehydes. [PDF]

, 2011
In a joint experimental and theoretical study, the UV/Vis absorption spectra of the three isomers (ortho, meta, para) of nitrobenzaldehyde (NBA) were analyzed. Absorption spectra are reported for NBA vapors, cyclohexane and acetonitrile solutions.
Ahlrichs, Aw, Becke, Becke, Bickelhaupt, Christiansen, Coppens, Coppens, Corral, Fernández, Finley, Fonseca Guerra, Galloway, Heinz, Inés Corral, Karlström, King, Konopacka, Kovács, Laimgruber, Laimgruber, Lee, Leticia González, Leyva, Leyva, Malmqvist, Morokuma, Pelliccioli, Perdew, Peter Gilch, Pinchas, Roos, Schmierer, Sengwa, Snijders, te Velde, Thomas Schmierer, Verónica Leyva, Widmark, Ziegler   +39 more
core   +1 more source

ANALISA FLAVONOID DARI EKSTRAK ETANOL 96% KULIT BUAH OKRA MERAH (Abelmoschus esculentus L. Moench) SECARA KROMATOGRAFI LAPIS TIPIS DAN SPEKTROFOTOMETRI UV-VIS

JIIS: Jurnal Ilmiah Ibnu Sina, 2016
Telah dilakukan penelitian tentang Analisa Flavonoid dari Ekstrak Etanol 96% Kulit Buah Okra Merah Secara Kromatografi Lapis Tipis dan Spektrofotometer UV-Vis.
Nia Lisnawati, Indri Astuti Handayani, Ni'matul Fajrianti   +2 more
doaj   +3 more sources

Remote Sensing Observation of New Particle Formation Events with a (UV, VIS) Polarization Lidar

Remote Sensing, 2019
Observations of new particle formation events in free troposphere are rather seldom and limited in time and space, mainly due to the complexity and the cost of the required on-board instrumentation for airplane field campaigns.
Alain Miffre, Danaël Cholleton, Tahar Mehri, Patrick Rairoux   +3 more
doaj   +1 more source

Diclofenac analysis in natural waters using UV-visible absorption spectrometric method

Macedonian Journal of Chemistry and Chemical Engineering, 2023
In this work, we developed an UV-visible (UV-VIS) absorption spectrometric method for the quantification of sodium diclofenac in natural waters. Several UV-VIS absorption method parameters were optimized.
Jean-Marie Bakhoum, Olivier Mbaye, Jean-Pierre Bakhoum, Mame Diabou Gaye-Seye, Clément Trellu, Coly Atanasse, Jean-Jacques Aaron   +6 more
doaj   +1 more source

Indigo in the nanochannels of zeolite L : towards a new type of colorant [PDF]

, 2018
A host-guest based colorant was synthesized by intercalating indigo molecules into the nanochannels of zeolite L (ZL). Reductive washing thereby ensured the efficient and selective removal of non-intercalated indigo molecules.
Brühwiler, Dominik, Ecker, Achim, Giger, Sandro, Müller, Patrick, Reber, Michael, Sägesser, Lucie, Woodtli, Pascal, Zucchetto, Nicola   +7 more
core   +1 more source

The spectral resolution of DOM in urban rivers affected by different non-point source intensities using self-organizing maps

Water Science and Technology, 2023
UV–Vis, three-dimensional excitation–emission matrix fluorescence spectroscopy (EEMs) and a self-organizing map (SOM) were used to study changes in the composition and constituent concentrations of dissolved organic matter (DOM) in the water column of ...
Xincheng Jin, Xiaoqing Chen, Liangmin Gao, Menghang Yuan, Yufan Wu, Hansong Lu, Jiahui Cui, Feiyan Wei   +7 more
doaj   +1 more source

Determination of Hexavalent Chromium (Cr(VI)) Concentrations via Ion Chromatography and UV-Vis Spectrophotometry in Samples Collected from Nacogdoches Wastewater Treatment Plant, East Texas (USA) [PDF]

, 2016
The concentration of hexavalent chromium (Cr(VI)), a toxic environmental pollutant and carcinogen, was determined in samples collected from Nacogdoches Wastewater Treatment Plant (NWWTP) using ion chromatography and UV-visible spectrophotometry (IC, UV ...
Onchoke, Kefa Karimu, Sasu, Salomey A
core   +3 more sources

Forensic examination of different textile fibres using UV- Vis spectroscopy [PDF]

E3S Web of Conferences
Objective: The purpose of this study is to forensically examine different textile fibres using UV/visible spectroscopy. Methodology: Five different fibre types of ten different local brands have been analyzed using uv-vis spectroscopy.Each fibre was ...
Aditi, Sharma Spriha
doaj   +1 more source