Review on development of assigned value microbiological reference materials used in food testing

2022 ◽  
Vol 102 ◽  
pp. 103904
Author(s):  
Kumud Ashish Singh ◽  
Rohit Rai ◽  
Santhini S. Nair
2019 ◽  
Vol 15 (3) ◽  
pp. 15-22
Author(s):  
A. M. Nepomiluev ◽  
V. V. Kazantsev ◽  
A. P. Shipitsyn

This paper is aimed at analysing the current state and prospects of metrological support and standardisation in the field of thermal analysis in Russia. Main characteristics of reference materials used for testing, graduating, calibrating, and verifying thermal analysis instruments are described.


1987 ◽  
Vol 110 (1) ◽  
pp. 147-158 ◽  
Author(s):  
R. H. Filby ◽  
S. Nguyen ◽  
S. Campbell ◽  
A. Bragg ◽  
C. A. Grimm

2007 ◽  
Author(s):  
A. Engel ◽  
C. Otterman ◽  
J. Klahn ◽  
D. Enseling ◽  
T. Korb ◽  
...  

2011 ◽  
Vol 4 (12) ◽  
pp. 2851-2858 ◽  
Author(s):  
M. Gysel ◽  
M. Laborde ◽  
J. S. Olfert ◽  
R. Subramanian ◽  
A. J. Gröhn

Abstract. The mass and effective density of black carbon (BC) particles generated from aqueous suspensions of Aquadag and fullerene soot was measured and parametrized as a function of their mobility diameter. The measurements were made by two independent research groups by operating a differential mobility analyser (DMA) in series with an aerosol particle mass analyser (APM) or a Couette centrifugal particle mass analyser (CPMA). Consistent and reproducible results were found in this study for different production lots of Aquadag, indicating that the effective density of these particles is a stable quantity and largely unaffected by differences in aerosol generation procedures and suspension treatments. The effective density of fullerene soot particles from one production lot was also found to be stable and independent of suspension treatments. Some differences to previous literature data were observed for both Aquadag and fullerene soot at larger particle diameters. Knowledge of the exact relationship between mobility diameter and particle mass is of great importance, as DMAs are commonly used to size-select particles from BC reference materials for calibration of single particle soot photometers (SP2), which quantitatively detect the BC mass in single particles.


1982 ◽  
Vol 26 ◽  
pp. 137-140
Author(s):  
George E. Hicho ◽  
Earl E. Eaton

In the steel hardening process, steel is heated to a temperature where a face-centered-cubic solid phase called austenite is formed. After a stabilization period, the steel is quenched into a medium which transforms the austenite into a metastable, body-centered-tetragonal solid phase called martensite. On occasion the austenite is not entirely transformed into martensite and some austenite remains. This untransformed (retained) austenite is sometimes detrimental to the finished product, and often there are requirements as to the amount of retained austenite permitted In the finished product.X-ray diffraction procedures (XRD) are normally used to determine the amount of retained austenite and this paper describes the preparation and characterization of the Standard Reference Materials used to calibrate x-ray diffraction units.


2015 ◽  
Vol 12 (1) ◽  
Author(s):  
JiYoung Hong ◽  
Ho Jung Oh ◽  
Naery Lee ◽  
Do-Keun Kim ◽  
Heui-Seong Yoon ◽  
...  

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