scholarly journals Fast analysis method of strontium-90 after separation using crown ether resin

2022 ◽  
Author(s):  
Fei Chen ◽  
Linlin Yan ◽  
Fei Gao ◽  
Xiao Ge ◽  
Qiang Xiong ◽  
...  
Keyword(s):  
Crown Ether ◽  
Analysis Method ◽  
Fast Analysis ◽  
Strontium 90

scholarly journals Alternative fast analysis method for cellulose sponge surface sampling wipes with low concentrations of Bacillus Spores

2019 ◽  
Vol 156 ◽  
pp. 5-8 ◽  
Author(s):  
Ahmed Abdel-Hady ◽  
M. Worth Calfee ◽  
Denise Aslett ◽  
Sang Don Lee ◽  
Barbara Wyrzykowska-Ceradini ◽  
...  
Keyword(s):  
Analysis Method ◽  
Surface Sampling ◽  
Fast Analysis ◽  
Cellulose Sponge ◽  
Low Concentrations ◽  
Bacillus Spores

Analysis Method of Compressor Stability Based on Eigenvalue Theory

2020 ◽  
Vol 142 (7) ◽  
Author(s):  
Dengke Xu ◽  
Chen He ◽  
Dakun Sun ◽  
Xiaofeng Sun
Keyword(s):  
Internal Flow ◽  
Flow Stability ◽  
Base Flow ◽  
System Stability ◽  
Design Stage ◽  
Engineering Practice ◽  
Force Model ◽  
Analysis Method ◽  
Fast Analysis ◽  
Blade Geometry

Abstract In order to analyze the flow stability of compressors rapidly in the design stage, a fast analysis method is developed in this paper. This method takes the base flow on each streamline at different spanwise locations as the research object and characterizes the effect of blade rows on the internal flow by establishing a body force model. Therefore, it is capable of taking the complex three-dimensional blade geometry and the abundant flow details into account, and what's more, it has a significantly high computational efficiency, which makes it available to engineering practice. Based on the eigenvalue theory, the flow stability problem is transformed into the eigenvalue problem, and the system stability is determined by the eigenvalue obtained by utilizing the singular value decomposition method. The flow stability of NASA Rotor 37 is analyzed to validate the reliability of the developed approach, and the results show that this analysis method is able to capture the process of stability deterioration with throttling and identify the blade tip region as the most unstable area. In order to further study the influence of blade geometry on compressor stability, a number of swept rotors are designed by modifying the stacking line of NASA Rotor 37. The assessment results via the developed method indicate that the forward sweep defined in this work can significantly improve the stability of the flow field in the tip region, while the backward sweep has the opposite effect.

scholarly journals A fast analysis method for non-invasive imaging of blood flow in individual cerebral arteries using vessel-encoded arterial spin labelling angiography

2012 ◽  
Vol 16 (4) ◽  
pp. 831-839 ◽  
Author(s):  
Michael A. Chappell ◽  
Thomas W. Okell ◽  
Stephen J. Payne ◽  
Peter Jezzard ◽  
Mark W. Woolrich
Keyword(s):  
Blood Flow ◽  
Cerebral Arteries ◽  
Arterial Spin Labelling ◽  
Analysis Method ◽  
Fast Analysis ◽  
Non Invasive ◽  
Spin Labelling

scholarly journals Application of Three Ecological Assessment Tools in Examining Chromatographic Methods for the Green Analysis of a Mixture of Dopamine, Serotonin, Glutamate and GABA: A Comparative Study

Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5436
Author(s):  
Atiah H. Almalki ◽  
Ibrahim A. Naguib ◽  
Fahad S. Alshehri ◽  
Badrah S. Alghamdi ◽  
Hashem O. Alsaab ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Assessment Tools ◽  
Gamma Aminobutyric Acid ◽  
Analysis Method ◽  
Fast Analysis ◽  
Gaba A ◽  
Qualitative And Quantitative ◽  
Chromatographic Methods ◽  
Scope Of Application ◽  
National Environmental

The assessment of greenness of analytical protocols is of great importance now to preserve the environment. Some studies have analyzed either only the neurotransmitters, dopamine, serotonin, glutamate, and gamma-aminobutyric acid (GABA), together or with other neurotransmitters and biomarkers. However, these methods have not been investigated for their greenness and were not compared with each other to find the optimum one. Therefore, this study aims to compare seven published chromatographic methods that analyzed the four neurotransmitters and their mixtures using the National Environmental Method Index, Analytical Eco-Scale Assessment (ESA), and Green Analytical Procedure Index (GAPI). As these methods cover both qualitative and quantitative aspects, they offer better transparency. Overall, GAPI showed maximum greenness throughout the analysis. Method 6 was proven to be the method of choice for analyzing the mixture, owing to its greenness, according to NEMI, ESA, and GAPI. Additionally, method 6 has a wide scope of application (13 components can be analyzed), high sensitivity (low LOQ values), and fast analysis (low retention times, especially for glutamate and GABA).

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