scholarly journals High-accuracy simultaneous measurement of particle size and location using interferometric out-of-focus imaging

2016 ◽  
Vol 24 (15) ◽  
pp. 16530 ◽  
Author(s):  
Lu Qieni ◽  
Han Kan ◽  
Ge Baozhen ◽  
Wang Xiang
Keyword(s):  
Particle Size ◽  
Simultaneous Measurement ◽  
High Accuracy

Simultaneous measurement of two major prostacyclin metabolites in urine

1990 ◽  
Vol 36 (11) ◽  
pp. 1978-1980 ◽  
Author(s):  
S Zureick ◽  
J Nadler ◽  
J Yamamoto ◽  
R Horton
Keyword(s):  
Angiotensin Ii ◽  
Blood Vessels ◽  
Simultaneous Measurement ◽  
Healthy Subjects ◽  
High Accuracy ◽  
High Concentration ◽  
Accuracy And Precision ◽  
Overall Evaluation ◽  
Excretion Rates ◽  
Apparently Healthy

Abstract We describe a combined HPLC-RIA technique to measure both major metabolites of prostacyclin (PGI2): 6-keto PGF1 alpha and 2,3-dinor-6 keto PGF1 alpha. The measurement of the former, which originates from renal blood vessels, and the latter, from systemic vessels and the liver, may provide a better overall evaluation of production than measurement of one metabolite. An aliquot of acidified urine with added 3H-labeled metabolites is adsorbed and then eluted from a C18 Bond-Elut column. The sample is then passed through an HPLC system by use of an isocratic solvent combination that separates the two metabolites from known prostaglandins. The purified metabolites are then quantified by RIA. Using a logit-log10 transform, one can measure between 12 and 250 pg of either metabolite, with high accuracy and precision (CVs of 12% for a low concentration and 7% for a high concentration). Reference values for apparently healthy subjects were, respectively, 107 (SD 45) and 171 (SD 69) ng/g creatinine for 6-keto PGF1 alpha and the dinor metabolite in men (n = 18) and 45 (SD 22) and 141 (SD 28) ng/g creatinine, respectively, in women (n = 15). Indomethacin in standard doses reduced both metabolite values by 50%. Intravenous administration of angiotensin II (5 ng/kg of body wt per minute) did not alter excretion rates, but equipressor doses of norepinephrine (0.1 microgram/kg per minute) increased the production of both metabolites (6-keto greater than dinor).

Digitalization of High Accuracy Thermo-Anemometer for Heat Flux Measurement in Stratified Flow

2011 ◽  
Author(s):  
Shunichi Sanae ◽  
Katsuhisa Ohba
Keyword(s):  
Heat Flux ◽  
Temperature Dependence ◽  
Simultaneous Measurement ◽  
Temperature Compensation ◽  
Flux Measurement ◽  
Stratified Flow ◽  
High Accuracy ◽  
Velocity Measurements ◽  
First Order ◽  
Field Programmable

In this study, the high-accuracy thermo-anemometer was developed to execute simultaneous measurement of temperature and velocity by employing Field Programmable Gate Array (FPGA) devices. A cold-wire temperature sensor has first-order lags due to thermal time constants, that means that a phase compensation is essential to measure temperature fluctuations with high frequency. The digital filter comprised the exact first-order lead characteristics was realized by the bilinear s-z transformation. It was verified that the temperature signals were appropriately compensated with an uncertainty of less than ±3.9% in frequency up to 10 kHz. For velocity measurements, a temperature compensation is indispensable owing to velocity and temperature dependence of response of a hot-wire anemometer in thermally stratified flow fields. The accuracy of the velocity measurements at high temperature was improved with the strict algorithm of the temperature compensation calculation incorporating the temperature dependence of the thermal properties of the air. The high-accuracy velocity measurement was realized within the accuracy of ±1.6% in the temperature range of 1.5 times as wide as that of the previous analog based system. The simultaneous measurement system for temperature and velocity was applicable to measure heat flux in thermally stratified flows.

Applications of Four-Channel Raman Difference Spectroscopy

1981 ◽  
Vol 35 (4) ◽  
pp. 428-432 ◽  
Author(s):  
Jaan Laane ◽  
Wolfgang Kiefer
Keyword(s):  
Raman Spectra ◽  
Carbon Disulfide ◽  
Simultaneous Measurement ◽  
Photon Counting ◽  
High Accuracy ◽  
Difference Spectroscopy ◽  
Difference Spectra ◽  
Counting System ◽  
Frequency Shifts ◽  
Very High

A four-channel photon counting system has been constructed for the measurement of Raman difference spectra. In this work we will describe the applications and advantages of such a system. Specifically, the simultaneous measurement of the parallel and perpendicular polarized compounds of the Raman spectra of both benzene and a mixture of benzene and benzene-d6 will be discussed. Spectra of two different mixtures of benzene and carbon disulfide and of the pure components were also recorded simultaneously using the four separate channels of the photon counting system. For both sets of data the solvent-induced frequency shifts were determined with very high accuracy.

scholarly journals Scale Analysis of Wavelet Regularization Inversion and Its Improved Algorithm for Dynamic Light Scattering

2018 ◽  
Vol 8 (9) ◽  
pp. 1473
Author(s):  
Yajing Wang ◽  
Jin Shen ◽  
Xi Yuan ◽  
Zhenhai Dou ◽  
Wei Liu ◽  
...  
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Particle Size Distribution ◽  
High Accuracy ◽  
Inversion Method ◽  
Scale Analysis ◽  
Inversion Result ◽  
Wavelet Regularization

In the large inversion range, the wavelet-regularization inversion method (WRIM) is an effective method for improving the inversion accuracy of dynamic light scattering (DLS) data. However, the initial decomposition scale (IDS) of this method has a great effect on the inversion accuracy. The particle size distribution (PSD) obtained from inappropriate IDS is not optimal. We analyze the effect of the different IDS on the inversion result in this paper. The results show that IDS of the smallest relative error should be chosen as the optimal IDS. However, because the true PSD is unknown in the practical measurements, this optimal IDS criterion is infeasible. Therefore, we propose an application criterion determining the optimal IDS. Based on this criterion, an improved WRIM with the optimal IDS is established. By the improved WRIM, high accuracy inversion PSD is obtained from DLS data. The simulated and experimental data demonstrate the effectiveness of this algorithm. Besides, we also further study the effect of the data noise on the optimal IDS. These studies indicate that the optimal IDS usually shows a downward trend with an increase of noise level.

Simultaneous measurement of particle size, velocity and temperature

1993 ◽  
Vol 4 (5) ◽  
pp. 559-565 ◽  
Author(s):  
J R Fincke ◽  
W D Swank ◽  
C L Jeffery ◽  
C A Mancuso
Keyword(s):  
Particle Size ◽  
Simultaneous Measurement
Sign in / Sign up

Export Citation Format

Share Document