scholarly journals Miniaturized and improved method for Apparent Total N-Nitroso Compounds determination in beer

2021 ◽  
Vol 67 (5) ◽  
pp. 498-502
Author(s):  
Tomáš Vrzal ◽  
Michaela Malečková ◽  
Jana Olšovská
Keyword(s):  
Hydrogen Bromide ◽  
Previous Method ◽  
Nitroso Compounds ◽  
Dead Volume ◽  
Acid Mixture ◽  
Improved Method ◽  
Reaction Coil ◽  
Total N ◽  
Oil Pump ◽  
Chemiluminescence Detector

A miniaturized and improved method for Apparent Total Nitroso Compounds determination in liquid matrices was developed. The main improvement is based on a miniaturized and modified apparatus for chemical denitrosation of nitroso compounds by hydrogen bromide in a glacial acetic acid mixture. The reaction is carried out in a teflon reaction coil while the reaction product, gaseous nitric oxide, is drifted to a chemiluminescence detector by the flow of argon together with a vacuum obtained by the detector's oil pump. The apparatus significantly increased the efficiency of the Apparent Total N-Nitroso Compounds determination (compared to the previous method), specifically, the dead volume of the apparatus was significantly decreased, and the effect of the reverse reaction was eliminated as well. The apparatus shortens the analysis time (1.4 min/injection), further it provides a lower detection limit (3 μg(N-NO)/l), quantification limit (10 μg(N-NO)/l), and method uncertainty (15%), and is simpler for the operation.

Mouth Shape Detection Based on Template Matching and Optical Flow for Machine Lip Reading

2013 ◽  
Vol 1 (1) ◽  
pp. 14-25 ◽  
Author(s):  
Tsuyoshi Miyazaki ◽  
Toyoshiro Nakashima ◽  
Naohiro Ishii
Keyword(s):  
Optical Flow ◽  
Template Matching ◽  
High Speed ◽  
Image Sequences ◽  
Previous Method ◽  
The Other ◽  
High Speed Camera ◽  
Improved Method ◽  
Time Period ◽  
Lip Reading

The authors describe an improved method for detecting distinctive mouth shapes in Japanese utterance image sequences. Their previous method uses template matching. Two types of mouth shapes are formed when a Japanese phone is pronounced: one at the beginning of the utterance (the beginning mouth shape, BeMS) and the other at the end (the ending mouth shape, EMS). The authors’ previous method could detect mouth shapes, but it misdetected some shapes because the time period in which the BeMS was formed was short. Therefore, they predicted that a high-speed camera would be able to capture the BeMS with higher accuracy. Experiments showed that the BeMS could be captured; however, the authors faced another problem. Deformed mouth shapes that appeared in the transition from one shape to another were detected as the BeMS. This study describes the use of optical flow to prevent the detection of such mouth shapes. The time period in which the mouth shape is deformed is detected using optical flow, and the mouth shape during this time is ignored. The authors propose an improved method of detecting the BeMS and EMS in Japanese utterance image sequences by using template matching and optical flow.

Urinary total N-nitroso compounds in patients with urinary diversion

1996 ◽  
Vol 5 (1) ◽  
pp. 103-104
Author(s):  
B Pignatelli ◽  
A L Poulsen ◽  
J M Cartensen ◽  
S Calmels ◽  
H Moller ◽  
...  
Keyword(s):  
Urinary Diversion ◽  
Nitroso Compounds ◽  
Total N

Determination of Extractable, Apparent Total N-Nitroso Compounds in Cured-Meat Products

1995 ◽  
Vol 78 (6) ◽  
pp. 1435-1439
Author(s):  
Walter Fiddler ◽  
John W Pensabene ◽  
Robert C Doerr ◽  
Robert A Gates
Keyword(s):  
Energy Analysis ◽  
Meat Products ◽  
Nitroso Compounds ◽  
Chemiluminescence Detection ◽  
Minimum Level ◽  
Reliable Measurement ◽  
Total N ◽  
Three Samples ◽  
Cured Meat

Abstract The modification of a newly developed method for determination of apparent total N-nitroso compounds by chemical denitrosation and chemiluminescence detection of nitric oxide (thermal energy analysis) is described. The minimum level of reliable measurement was 0.1 ppm, and the repeatability of the method was 0.2 ppm, based on the response of N-nitrosoproline (NPro). Seventy-three samples of cured-meat products, including frankfurters, bacon, and ham, were examined; 50 samples contained less than 1 ppm. The largest amounts, up to 24.8 ppm, were detected in canned corned beef. This method has several advantages over other methods.

Reactions with 2-Carboxyindole-3-acetic Acid Imides, Preparation of Some Imides, their Condensations with Aromatic Aldehydes and Nitroso Compounds and their Coupling with Diazonium Salts

1976 ◽  
Vol 31 (5) ◽  
pp. 589-593 ◽  
Author(s):  
M. I. Ali ◽  
A. A. El-Sayed ◽  
A. M. Abdel-Fattah ◽  
A. M. El-Reedy
Keyword(s):  
Acetic Acid ◽  
Aromatic Aldehydes ◽  
Acid Anhydride ◽  
Nitroso Compounds ◽  
Primary Amines ◽  
Acid Mixture ◽  
Diazonium Salts ◽  
Condensation Products ◽  
Cyclic Imides

Heating 2-carboxyindole-3-acetic acid anhydride (1) with primary amines, the cyclic imides 1,2,3,4-tetrahydro-9 H-2-arylpyrido[3,4-b]indole-1,3-diones (2) were obtained. Compounds 2 coupled with diazonium salts to give 4-arylazo derivatives (3), condensed with aromatic aldehydes afforded 4-arylmethylene derivatives (4). Benzylation of 2 yielded the 4,4-dibenzyl derivative (6). 2 reacted also with p-nitrosodimethylaniline to yield the azomethine derivatives (7) which were hydrolysed by hydrochloric/acetic acid mixture to give the triketo compounds (8). The structure assigned to the condensation products have been supported by NMR and IR data.

Group-selective determination of total N-nitroso compounds in nitrate-containing human urine samples

The Analyst ◽  
1989 ◽  
Vol 114 (9) ◽  
pp. 1103 ◽  
Author(s):  
Brigitte Pignatelli ◽  
Chong-Sheng Chen ◽  
Pascal Thuillier ◽  
Helmut Bartsch
Keyword(s):  
Human Urine ◽  
Urine Samples ◽  
Nitroso Compounds ◽  
Total N ◽  
Selective Determination ◽  
Human Urine Samples

Improved Method of Direct Measurement of the First-Order Mass Moments of Human Body Segments

2016 ◽  
Vol 698 ◽  
pp. 69-72
Author(s):  
Kosuke Suzuki ◽  
Kenta Nakaya ◽  
Akihiro Takita ◽  
Kazuhito Shimada ◽  
Yusaku Fujii
Keyword(s):  
Estimation Method ◽  
Previous Method ◽  
Previous Measurement ◽  
Scale Model ◽  
Measurement Time ◽  
Improved Method ◽  
First Order ◽  
Moment Estimation ◽  
Relative Standard ◽  
Mass Moment

The purpose of this research is to reduce the measurement time of the first-order mass moment estimation method proposed by us previously. In the previous method, the loads at the three points of the board are measured one by one using one piece of an expensive scale (model: GX-30KR, resolution: 0.1 g, price: 2,542 USD). The relative standard uncertainly of measurement using a rigid body is estimated to be 1.7% and the measurement time is approximately 10 minutes. In this research, three pieces of inexpensive scales (model: HD-660, resolution: 100 g, price: 17 USD) are used to reduce the measurement time. The relative standard uncertainly of measurement is estimated to be 1.9% and the measurement time is approximately 1 minute. In previous measurement, when changing the position of the scale, the position of the frame has been deviated slightly. However, in this method, this kind of error does not occur, since measurements of three points are simultaneously conducted.

Elliptical Deformation of a Floating Roof Pontoon Due to Radial Second Mode of Sloshing (Effect of the Geometry of Pontoon Cross-Section on the Hoop Membrane Stress)

2011 ◽  
Vol 133 (5) ◽  
Author(s):  
M. Utsumi ◽  
K. Ishida
Keyword(s):  
Cross Section ◽  
Plane Deformation ◽  
Previous Method ◽  
Improved Method ◽  
Membrane Stress ◽  
Oil Storage ◽  
Second Mode ◽  
Out Of Plane ◽  
Bending Stresses ◽  
Circumferential Wave

The radial second mode of sloshing in a circular cylindrical oil storage tank induces an out-of-plane deformation of the floating roof deck. The radial contraction of the deck due to this out-of-plane deformation contains modal components with circumferential wave numbers 0 and 2, thereby causing an elliptical deformation of the pontoon, which encloses the deck. In a previous paper, the stress caused by this elliptical deformation was analyzed by regarding the radial contraction of the deck as an enforced displacement of the whole pontoon. This paper presents an improved method for this stress analysis by considering the radial contraction of the deck as an enforced displacement of the joint between the deck and the pontoon. First, the effectiveness of the previous method in estimating the hoop membrane stress at the joint with the deck is confirmed by comparing the results obtained from the previous and improved method. Next, the improved method is used to predict also the other stress components in each portion of the pontoon. Numerical results reveal that the bending stresses are magnified locally near the joint with the deck and that the hoop membrane stress in the outer portion of the pontoon sensitively depends on the geometry of the cross-section of the pontoon. It is found that the hoop membrane stress near the joint between the outer rim and the top (or bottom) of the pontoon can be significantly reduced by increasing the slope of the top (or bottom) of the pontoon.

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