scholarly journals Combined use of noncoherent scattering and vertical sounding methods for determination of ionospheric plasma electronic concentration

2003 ◽  
Vol 9 (2s) ◽  
pp. 53-56
Author(s):  
Yu.V. Chernyak ◽  
Keyword(s):  
Ionospheric Plasma ◽  
Combined Use ◽  
Electronic Concentration ◽  
Plasma Electronic

scholarly journals UV Spectrophotometric Simultaneous Determination of Paracetamol and Ibuprofen in Combined Tablets by Derivative and Wavelet Transforms

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Vu Dang Hoang ◽  
Dong Thi Ha Ly ◽  
Nguyen Huu Tho ◽  
Hue Minh Thi Nguyen
Keyword(s):  
Simultaneous Determination ◽  
Wavelet Transforms ◽  
Hybrid Approach ◽  
Uv Spectra ◽  
Order Derivative ◽  
First Order ◽  
Spectrophotometric Methods ◽  
Combined Use ◽  
Linear Concentration

The application of first-order derivative and wavelet transforms to UV spectra and ratio spectra was proposed for the simultaneous determination of ibuprofen and paracetamol in their combined tablets. A new hybrid approach on the combined use of first-order derivative and wavelet transforms to spectra was also discussed. In this application, DWT (sym6 and haar), CWT (mexh), and FWT were optimized to give the highest spectral recoveries. Calibration graphs in the linear concentration ranges of ibuprofen (12–32 mg/L) and paracetamol (20–40 mg/L) were obtained by measuring the amplitudes of the transformed signals. Our proposed spectrophotometric methods were statistically compared to HPLC in terms of precision and accuracy.

Optical Methodology for Testing of Microsystems

2009 ◽  
Author(s):  
Ryszard J. Pryputniewicz ◽  
Ryan T. Marinis ◽  
Peter Hefti
Keyword(s):  
High Performance ◽  
Emerging Technologies ◽  
Reliability Assessment ◽  
Design Analysis ◽  
Functional Characteristics ◽  
Micro Scale ◽  
Combined Use ◽  
Challenging Tasks ◽  
Micro Structures

Advancing the emerging technologies of MEMS, especially relating to the applications, constitutes one of the most challenging tasks in today’s micromechanics. In addition to design, analysis, and fabrication capabilities, this task also requires advanced test methodologies for determination of functional characteristics of devices produced to enable verification of their operation as well as refinement and optimization of specific designs. The tools used can be categorized as analytical, computational, and experimental. Solutions using the tools from any one category alone do not usually provide all of the necessary information on MEMS and extensive merging, or hybridization, of the tools from different categories is used. One of the approaches employed in the development of micro-structures of contemporary interest, is based on a combined use of the analytical, computational, and experimental solutions (ACES) methodology. In this paper, applicability of the ACES methodology is illustrated by use of selected MEMS samples. The representative results presented in this paper indicate that the optical methodology is a viable tool for micro-scale measurements and, as such, it is particularly useful for development of MEMS, especially while considering MEMS reliability assessment. In fact, this methodology is being used in various manufacturing stages of MEMS for high-performance applications.

Combined enzymic-Jaffé method for determination of creatinine in serum.

1981 ◽  
Vol 27 (1) ◽  
pp. 18-21 ◽  
Author(s):  
P Masson ◽  
P Ohlsson ◽  
I Björkhem
Keyword(s):  
Reference Method ◽  
Enzyme Reaction ◽  
Creatine Phosphate ◽  
Mass Fragmentography ◽  
Good Precision ◽  
Serum Samples ◽  
Modified Method ◽  
Combined Use ◽  
High Concentrations

Abstract Concentrations of creatinine, as determined in serum by a method involving the combined use of creatinine amidohydrolase (EC 3.5.2.10) and alkaline sodium picrate were found to be factitiously low, owing to a reversal of the enzyme reaction. This effect could be eliminated by converting creatine, the product of the enzymic reaction, to creatine phosphate. The combined enzymic-Jaffé method was therefore modified to include creatine amidohydrolase, creatine kinase, ATP, and Mg2+ in the reaction mixture. The modified method has good precision. We saw no significant interferences by relatively high concentrations of acetone, acetylacetone, ADP, creatine, creatine phosphate, glucose, glycocyamine, or pyruvate. Likewise, no interferences were evident with icteric, lipemic, or hemolytic serum samples. There was an excellent agreement between creatinine values obtained with our method and by a reference method based on isotope dilution-mass fragmentography. Our method is considerably simpler than the fully enzymic method for determination of creatinine and might be a method of choice if a high accuracy is desired.

scholarly journals Combined use of chiral ionic liquid and CD for MEKC: Part II. Determination of binding constants

2009 ◽  
Vol 30 (16) ◽  
pp. 2820-2828 ◽  
Author(s):  
Bin Wang ◽  
Jun He ◽  
Victoria Bianchi ◽  
Shahab A. Shamsi
Keyword(s):  
Ionic Liquid ◽  
Binding Constants ◽  
Combined Use ◽  
Chiral Ionic Liquid
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