Determination of the optimum amount of the solid lubricant of composite antifriction materials

1988 ◽  
Vol 27 (6) ◽  
pp. 485-488
Author(s):  
G. Kh. Karapetyan ◽  
N. L. Akopov ◽  
F. Kh. Karapetyan ◽  
N. N. Manukyan
Keyword(s):  
Solid Lubricant ◽  
Optimum Amount ◽  
Antifriction Materials ◽  
Composite Antifriction

Phase representation and property determination of raw materials of solid lubricant

2008 ◽  
Vol 23 (1) ◽  
pp. 130-133 ◽  
Author(s):  
Huogui Yu ◽  
Ping Hu ◽  
Ting Shang ◽  
Ming Jiang ◽  
Qian Chen
Keyword(s):  
Solid Lubricant ◽  
Raw Materials ◽  
Phase Representation

scholarly journals Influence of natural radium contamination of barium chloride on the determination of radium isotopes in the water samples using α/β liquid scintillation spectrometry

Nukleonika ◽  
2016 ◽  
Vol 61 (4) ◽  
pp. 467-471
Author(s):  
Chau Nguyen ◽  
Magdalena Czechowska ◽  
Jakub Nowak ◽  
Paweł Jodłowski
Keyword(s):  
Water Samples ◽  
Liquid Scintillation ◽  
Activity Concentration ◽  
Barium Chloride ◽  
Counting Method ◽  
Optimum Amount ◽  
Radium Isotopes ◽  
Chemical Companies ◽  
Chemical Procedure

Abstract The determination of radium isotopes in drinking water by liquid scintillation technique requires some reagents that are used for separating radium from water samples. One of the main reagents is BaCl2·H2O. This paper presents the study of this compound and shows that barium chloride reagent is naturally contaminated with226Ra. The 226Ra activity concentration in BaCl2·H2O reagent produced by chemical companies from Poland and other countries is equal to a few dozen Bq/kg. Furthermore, 14 mL of 0.10 M BaCl2·H2O solution is the optimum amount which should be used for the chemical procedure. At the optimum amount of barium chloride and 2-hour measurement, the detection limit of 226Ra and 228Ra of the liquid scintillation counting method is equal to 5 and 30 mBq per sample, respectively.

Anisotropy of sintered antifriction materials containing a solid lubricant

1970 ◽  
Vol 9 (2) ◽  
pp. 156-159 ◽  
Author(s):  
L. S. Abramova ◽  
A. B. Al'tman ◽  
V. é. Vainshtein ◽  
Ya. A. Gluskin ◽  
V. L. Memelov
Keyword(s):  
Solid Lubricant ◽  
Antifriction Materials

scholarly journals Designing of Parking Spaces Taking into account the Parameters of Design Vehicles in Russia

2020 ◽  
Vol 22 (2) ◽  
pp. 31-41
Author(s):  
Miroslava Mikusova ◽  
Jamshid Abdunazarov ◽  
Joanna Zukowska ◽  
Alisher Usmankulov
Keyword(s):  
Transportation Infrastructure ◽  
Parking Space ◽  
Optimum Amount ◽  
Passenger Cars ◽  
Small Cities ◽  
Parking Place

Nowadays, in all the cities, there is an acute problem of a lack of parking spaces. The number of vehicles are becoming more and more larger, not only in megacities, but in small cities of the country, as well and there are no more parking places - the pace of solving the problem is several times slower than the rate of the transport growth among the citizens. The article is dedicated to the determination of the optimum sizes parking place for designing vehicles on a parking space, which is an element of the roads. The optimum amount parking places are determined on examples of the passenger cars and trucks. The results of research on dimensioning of parking spaces and recommendations to use the results for design of objects of transportation infrastructure are presented. According to the research, authors included the term "design vehicle" and gave its definition. The authors developed a template for 7 types of design vehicles and their sizes and also recommended sizes for longitudinal parking for each of their design vehicles. The optimum parking plot angles are determined, as well.

scholarly journals Determination of the Optimum Amount of Superplasticizer Additive for Self-Compacting Concrete

2020 ◽  
Vol 10 (9) ◽  
pp. 3096 ◽  
Author(s):  
Jose A. Sainz-Aja ◽  
Isidro A. Carrascal ◽  
Juan A. Polanco ◽  
Israel Sosa ◽  
Carlos Thomas ◽  
...  
Keyword(s):  
Power Consumption ◽  
Saturation Point ◽  
Self Compacting Concrete ◽  
Optimum Amount ◽  
Concrete Mixer

Self-compacting concrete modifies its workability with small variations in the amount of superplasticizer additive. For this reason, large number of tests are required to monitor its workability. In order to determine the appropriate amount of additive for a single mix, the evolution of the power consumption of the concrete mixer during the addition of small amounts of additive to the concrete was analyzed. These results were compared both with typical workability characterization for self-compacting concrete and with the saturation point results, determined by the Marsh cone method. After this comparison, a good correlation was obtained between the results from the traditional tests and the proposed “concrete mixer method”.

scholarly journals Rapid Method for the Determination of Capsaicin and Dihydrocapsaicin in Gochujang Using Ultra-High-Performance Liquid Chromatography

2010 ◽  
Vol 93 (6) ◽  
pp. 1905-1911 ◽  
Author(s):  
Jaeho Ha ◽  
Hye-Young Seo ◽  
You-Shin Shim ◽  
Hyun-Jin Nam ◽  
Homoon Seog ◽  
...  
Keyword(s):  
High Performance ◽  
Hplc Analysis ◽  
Hplc Separation ◽  
Block Method ◽  
Optimum Amount ◽  
Extraction Solvent ◽  
Validation Parameters ◽  
Aoac Method ◽  
Extracting Solvent

Abstract A sensitive and specific heating block method coupled with ultra-HPLC (u-HPLC) was developed for the analysis of capsaicin in Gochujang and validated by comparing with a conventional HPLC (AOAC Method 995.03). The method validation parameters yielded good results, including linearity, precision, accuracy, and recovery. The u-HPLC separation was performed on a reversed C18 column (50 2 mm id, particle size 2 m), followed by fluorescence detection (excitation 280 nm, emission 325 nm). Methanol was used as the extracting solvent, and the amount of sample taken was approximately 0.2 g; the optimum amount of extraction solvent and extraction time were 15 mL and 1 h, respectively. The recovery of capsaicin in Gochujang was more than 93, and the LOD and LOQ of the u-HPLC analysis were 0.05 and 0.16 g/g for capsaicin and 0.05 and 0.16 g/g for dihydrocapsaicin. The calibration graphs for capsaicin and dihydrocapsaicin were linear from 0.2 to 10.0 g/mL for u-HPLC. The interday and intraday precisions (RSD values) were <6.27.

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