Deformation of concrete at variable moisture content

2021 ◽  
Vol 25 (3) ◽  
pp. 101-105
Author(s):  
Ján Novák

This paper contains the results of measuring the electrical properties of mung beans (Vigna radiata L.) set. The conductivity and relative permittivity are the main parameters of dielectric material electrical properties. The electrical properties of mung beans samples had not been sufficiently measured, and the aim of this work was to perform the measurements of these properties. Measurements were performed under variable moisture content and the frequency of electric field from 0.1 kHz till 200 kHz for conductivity and in the range from 1 MHz to 16 MHz for relative permittivity, using RLC meter and Q meter, respectively. It was concluded that relative permittivity, and conductivity increased with increase of moisture content, resistivity, impedance, loss tangent, and relative permittivity decreased as the frequency of electric field increased, respectively.


Wood Research ◽  
2021 ◽  
Vol 66 (4) ◽  
pp. 569-581
Author(s):  
DOMINIK HESS ◽  
PETR PAŘIL ◽  
JAKUB DÖMÉNY ◽  
JAN BAAR

This is a studyofthe influence of microwave (MW) pre-treatment on the permeabilityof Norway spruceripewood(Picea abiesL. Karst)as it affects its mechanical properties. Specimens weretreated under variable moisture content,MW intensity,and impregnation processes. According to the results,thespecimens withaninitial moisture contentof 45–65% exhibited the highest permeabilityvaluescompared to referencesamples. Aninsignificant difference was found between MW pre-treatments at2 and3kW.Statistically significant results were found afterlong-time (24h) vacuum-pressureimpregnation(LP). Theaverage retention value followingLP was 132 kg.m-3, which isalmost threetimes greater thanthe MW-treatedgroupsimpregnated in ashort-time vacuum-pressure process. The average depth of penetration after LP was 2.0mm and the proportion of the impregnation area followingLP was 17.6%. MW pre-treatment had no effect on the impregnability or the mechanical propertiesof the wood; other MW regimes are open for further examination.


2001 ◽  
Vol 18 (5) ◽  
pp. 279-289 ◽  
Author(s):  
Bruce Choy ◽  
Danny D. Reible ◽  
Kalliat T. Valsaraj

1968 ◽  
Vol 19 (03/04) ◽  
pp. 423-429 ◽  
Author(s):  
G. M Thelin ◽  

SummaryA stable, lyophilized AHF reference plasma has been prepared from pooled plasma from at least 50 normal healthy donors and standardized against a primary standard of fresh plasma from 20 healthy male donors aged 20 to 40. Average AHF potency of a typical lot is 98.8%, and moisture content is less than 0.5%. Under storage at -25° C, this AHF reference plasma is stable for at least 18 months. It has been used in several major coagulation laboratories, and has given consistently satisfactory and reproducible results in AHF assays.


Sign in / Sign up

Export Citation Format

Share Document