Simple Test Method for Determining Shear Strength of Concrete

2022 ◽  
Author(s):  
Muhammad N. S. Hadi ◽  
Umer Sajjad ◽  
M. Neaz Sheikh
Keyword(s):  
Shear Strength ◽  
Test Method ◽  
Simple Test

scholarly journals Preparation of Isotopically Labelled Standards of Creatinine Via H/D Exchange and Their Application in Quantitative Analysis by LC-MS

Molecules ◽  
2020 ◽  
Vol 25 (7) ◽  
pp. 1514
Author(s):  
Remigiusz Bąchor ◽  
Andrzej Konieczny ◽  
Zbigniew Szewczuk
Keyword(s):  
Internal Standard ◽  
Test Method ◽  
Simple Test ◽  
Liquid Chromatography Mass Spectrometry ◽  
Creatinine Concentration ◽  
Back Exchange ◽  
Acidic Conditions ◽  
Facile Preparation ◽  
The Stability ◽  
Neutral Conditions

Kidneys play a crucial role in maintaining metabolic homeostasis in a body. Serum creatinine concentration is a simple test used as an indicator of renal function. One of the known ways of quantifying creatinine concentration is the liquid chromatography-mass spectrometry (LC-MS) method, using an isotopically labeled analog of creatinine as an internal standard. Unfortunately, such isotope-labeled analogs are expensive and their synthesis is complex. Here we demonstrate a facile preparation of deuterated analogues of creatinine, via the H/D exchange of hydrogens located at the α-carbon (α-C) of the N-methylated amino acid part, under basic conditions. The stability of retrieved isotopologues was analyzed under both neutral or acidic conditions, and the results revealed that the introduced deuterons do not undergo back-exchange. In addition, the coelution of deuterated and non-deuterated forms under acidic and neutral conditions was observed. The prepared isotopologues were successfully applied in the quantitative LC-MS analysis of urine samples, and the results demonstrated that the presented strategy is novel and inexpensive, and that the quantification correlates with the commonly used Jaffe test method.

Evaluating Thermal Expansion Coefficient of SiC Coatings by Relative Method

2017 ◽  
Vol 726 ◽  
pp. 110-114
Author(s):  
Rui Na Pan ◽  
Chen Guang Wei ◽  
Yi Wang Bao ◽  
De Tian Wan ◽  
Yan Ping Wang
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Ceramic Coatings ◽  
Test Method ◽  
Experimental Results ◽  
Simple Test ◽  
Relative Method ◽  
Novel Method ◽  
Sic Coatings

A simple test approach named relative method is developed for determining the thermal expansion coefficient of ceramic coatings. Although ceramic coatings are hardly separated from the substrates, it was evaluated in this work simply by need only the measured thermal expansion coefficient of coated samples and substrates. This novel method was demonstrated to be valid for rectangular beam samples of two types of coating configurations: sandwich coating and around coating. The feasibility of this test method was confirmed by experimental results of SiC coating.

Simple Test Method for Squeak & amp; Rattle Evaluation of Door Trim by Using Statically Repeated Loading Robot Arm

2009 ◽  
Author(s):  
Hyunchul Lee ◽  
Hyunmin Park ◽  
Hyunghyun Na ◽  
Jongsoo Kim ◽  
Ohhwan Jeon ◽  
...  
Keyword(s):  
Test Method ◽  
Repeated Loading ◽  
Robot Arm ◽  
Simple Test
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