Solid mineral fuels. Coke. Determination of moisture in the general analysis test sample

2010 ◽  
Keyword(s):  
Test Sample ◽  
General Analysis

Determination Of Reaction Time Changes Per Time Unit In Clot Assays

1981 ◽  
Author(s):  
Lj Popović
Keyword(s):  
Reaction Time ◽  
Standard Sample ◽  
Reaction Times ◽  
Test Sample ◽  
Total Reaction ◽  
The Difference ◽  
Time Changes ◽  
Total Reaction Time

Changes in reaction time of clot assays are usually expressed only in time units, which fails to indicate the extent of the increase or decrease of the reaction time of the tested specimens against that of the basic sample. Reaction time increases of, e.g. , 6 seconds in tested samples, compared to basic sample reaction times of 12 and 24 seconds respectively, signify an increase twice as large in the first as in the second instance.Changes in reaction time of clot assays can be expressed as the increment or decrement of the reaction time per time unit. This amount of increase or decrease (positive or negative alteration of reaction time, T a ) can be expressed as the quotient of the difference between the reaction times of the tested (T x ) and basic (To) samples and of the basic sample, e.g. in seconds per second, T a =T x -To/To. A test sample reaction time 6 seconds longer than basic sample reaction times of 12 and 2k seconds would mean an increase of 0.5 and 0.25 seconds per second, respectively.Reaction time changes of tested samples against that of the standard sample (T std ) can be calculated in a similar way, T a =T x -T std /T std .It can be assumed that this parameter reflects the intensity of the increase or decrease of reaction time per time unit. The quotient of the tested and basic samples can be considered as the coefficient of the increase or decrease of the total reaction time (CT=T x /To).

The Determination of Iodine in Biologic Material

1964 ◽  
Vol 10 (9) ◽  
pp. 799-823 ◽  
Author(s):  
H Hoch ◽  
S L Sinnett ◽  
T H McGavack
Keyword(s):  
Sulfuric Acid ◽  
Sulfate Reduction ◽  
Perchloric Acid ◽  
Healthy Subjects ◽  
Test Sample ◽  
Chloric Acid ◽  
Total Serum ◽  
Acid Digestion ◽  
Reduction Test

Abstract The chloric acid digestion of serum, followed by the ceric sulfate reduction test for iodine has been shown to give results reproducible to within ± 0.00035 µg. iodine per test sample (1) if the entire digestion tubes are kept hot during the combustion step so that products of incomplete oxidation are vaporized, (2) if the perchloric acid and sulfuric acid concentrations in the final digest are adjusted to 1.64 normal (16.5%) and 0.37 normal, respectively, (3) if attention is paid to the order of addition of the reagents, and (4) if the arsenite reagent is added within a fraction of a second. The method gave values for total serum iodine in 20 healthy subjects between 5 and 10.5 µg./100 ml.

Quantification of Environmental Stress Cracking in Polymer Blends through Eyring Modeling

2004 ◽  
Vol 856 ◽  
Author(s):  
Peyton L. Hopson ◽  
Robert B. Moore
Keyword(s):  
Environmental Stress ◽  
Test Sample ◽  
Stress Cracking ◽  
Rule Of Mixtures ◽  
Miscible Blend ◽  
Environmental Stress Cracking ◽  
Fluid Environment ◽  
Immiscible Blend ◽  
Craze Initiation

ABSTRACTThe effect of blending polycarbonate (PC) with an amorphous copolyester (PCTG) and a crystallizable polyester (PBT) on the environmental stress cracking (ESC) resistance was studied. The determination of the ESC resistance for the blend was accomplished through tensile testing in a fluid environment utilizing an Eyring-type activated process to describe ESC. It was found that the miscible blend, PC/PCTG, displayed a rule of mixtures for ESC resistance to all fluids tested except ether resistance. The immiscible blend, PC/PBT, displayed a significant negative deviation from the rule of mixtures for ESC resistance, except for ether resistance, which has been attributed to the development of stress sites for craze initiation at the interface between the blend components on the surface of the test sample. The differences in ether resistance compared to the trends found for the fluid ESC resistance in this study were attributed to possible changes in crystallization for the samples tested in ether. The data suggests that strongly swelling fluids, e.g. diethyl ether in the presence of PC, may cause densification from polymer crystallization resulting in voids that facilitate in the initiation and growth of crazes.

scholarly journals Determination of Patulin in Apple Juice by Liquid Chromatography: Collaborative Study

1996 ◽  
Vol 79 (2) ◽  
pp. 451-455 ◽  
Author(s):  
Allan R Brause ◽  
Mary W Trucksess ◽  
Frederick S Thomas ◽  
Samuel W Page ◽  
J Burke ◽  
...  
Keyword(s):  
Apple Juice ◽  
Fruit Juice ◽  
Collaborative Study ◽  
Test Sample ◽  
Reversed Phase ◽  
International Union ◽  
Relative Standard ◽  
Liquid Chromatographic ◽  
Reversed Phase Lc

Abstract An AOAC International-International Union of Pure and Applied Chemistry-International Fruit Juice Union (AOAC-IUPAC-IFJU) collaborative study was conducted to evaluate a liquid chromatographic (LC) procedure for determination of patulin in apple juice. Patulin is a mold metabolite found naturally in rotting apples. Patulin is extracted with ethyl acetate, treated with sodium carbonate solution, and determined by reversed-phase LC with UV detection at 254 or 276 nm. Water, water-tetrahydrofuran, or water-acetonitrile was used as mobile phase. Levels determined in spiked test samples were 20, 50,100, and 200 μg/L. A test sample naturally contaminated at 31 μg/L was also included. Twenty-two collaborators in 10 countries analyzed 12 test samples of apple juice. Recoveries averaged 96%, with a range of 91-108%. Repeatability relative standard deviations (RSDr) ranged from 10.9 to 53.8%. The reproducibility relative standard deviation (RSDR) ranged from 15.1 to 68.8%. The LC method for determination of patulin in apple juice has been adopted first action by AOAC INTERNATIONAL.

A Fluorometric Method for Measuring Leucine Aminopeptidase Activity in Red Blood Cells, Serum, or Tissues

1970 ◽  
Vol 16 (5) ◽  
pp. 412-415 ◽  
Author(s):  
Tetsuo Uete ◽  
Hiroko Tsuchikura ◽  
Kiichi Ninomiya
Keyword(s):  
Blood Cells ◽  
Leucine Aminopeptidase ◽  
Test Sample ◽  
Tissue Homogenate ◽  
Aminopeptidase Activity ◽  
Supernatant Fluid ◽  
Fluorometric Method ◽  
Fluorometric Determination ◽  
Amine Solutions

Abstract A fluorometric determination of leucine aminopeptidase activity in a biological system is described, which is simpler and more sensitive than colori-metric methods. Serum or tissue homogenate is incubated with L-β-naphthylamide at pH 7.2 and 37°C for 10 min. After incubation, ethanol is added to stop the reaction and protein is precipitated. The fluorescence of j3-naphthylamine in the supernatant fluid is measured. Since β-naphthylamide reduces the intensity of the fluorescence of s-naphthyl-amine, solutions used in preparing the standard s-naphthylamine curve must have the same concentration of L-leucyl-s-naphthylamide present as in the test sample.

scholarly journals Determination of the Material Relative Permittivity in the UHF Band by Using T and Modified Ring Resonators

2016 ◽  
Vol 62 (2) ◽  
pp. 129-134 ◽  
Author(s):  
Piotr Jankowski-Mihułowicz ◽  
Wojciech Lichoń ◽  
Grzegorz Pitera ◽  
Mariusz Węglarski
Keyword(s):  
Relative Permittivity ◽  
Software Tool ◽  
Test Sample ◽  
Ring Resonators ◽  
Model Calculations ◽  
Electronic Products ◽  
Materials Used ◽  
Permittivity Measurements ◽  
Uhf Band

Abstract The complete methodology of designing T- and modified ring resonators in the UHF band are presented in the paper. On the basis of proposed algorithms, the dedicated software tool has been elaborated in order to determine material parameters of contemporary substrates. The program is implemented in the Mathcad environment and it includes the base of information on known materials used in electronic products. Also, test sample series for selected substrate materials (IS680, FR408, I-SPEED PCB ISOLA and A6-S LTCC FERRO) and operating frequencies from 1 GHz to 3 GHz are analyzed in details. The special test stand with a vector network analyzer has been applied in experiments. The obtained data of relative permittivity measurements and model calculations are described, discussed and concluded.

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