Comparison of Fire Resistance Testing Methods for Structures with Timber Elements

2021 ◽  
Vol 109 ◽  
pp. 73-85
Author(s):  
Tomáš Žajdlík ◽  
Karel Šuhajda
Keyword(s):  
Fire Resistance ◽  
Experimental Testing ◽  
Building Construction ◽  
The Other ◽  
Resistance Testing ◽  
Testing Methods ◽  
The Czech Republic ◽  
Timber Construction ◽  
Main Disadvantage ◽  
Natural Wood

Wood is a natural anisotropic material that is used in building construction because of the advantageous properties of wood. Speed of construction and the final price of the building represent the main advantages of timber houses. On the other hand, the main disadvantage of these buildings can be the low fire resistance due to the flammable properties of natural wood. There are many limitations for designing these kinds of buildings in the Czech Republic. The limitations are presented in the standards and laws of the CR. This article focuses on the comparison of the methods for testing structures using timber construction elements. The paper presents and compares experimental testing results of a timber structure’s fire resistance in a combustion chamber.

scholarly journals Investigation into the Lithium-Ion Battery Fire Resistance Testing Procedure for Commercial Use

Batteries ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 44
Author(s):  
Daniel Darnikowski ◽  
Magdalena Mieloszyk
Keyword(s):  
Fire Resistance ◽  
Safety Evaluation ◽  
Lithium Ion ◽  
Testing Procedure ◽  
Resistance Testing ◽  
Distribution Data ◽  
Safety Test ◽  
Storage Technologies ◽  
Thermal Stability Of ◽  
Reliable Testing

Lithium-ion batteries (LIBs) have many advantages (e.g., high voltage and long-life cycle) in comparison to other energy storage technologies (e.g., lead acid), resulting in their applicability in a wide variety of structures. Simultaneously, the thermal stability of LIBs is relatively poor and can be damaged by exposure to fire. This paper presents an investigation into a fire resistance safety test for LIBs and the use of thermal sensors to evaluate exposure conditions and estimate the temperatures to which cells are subjected. Temperature distribution data and statistical analysis show significant differences of over 200 ∘C, indicating the stochastic nature of the heating curve despite following the testing procedure requirements. We concluded that the current testing procedure is inadequate for the reliable testing of LIBs, leaving an alarming loophole in the fire safety evaluation. The observed instability is mostly related to wind speed and direction, and fire source size.

scholarly journals Characterization of Salmonella serotypes prevalent in asymptomatic people and patients

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Haiyan Xu ◽  
Weibing Zhang ◽  
Kai Zhang ◽  
Yue Zhang ◽  
Zhenyu Wang ◽  
...  
Keyword(s):  
Antimicrobial Resistance ◽  
Asymptomatic Infection ◽  
Resistance Rate ◽  
Human Infection ◽  
The Other ◽  
Resistance Testing ◽  
Multi Drug Resistance ◽  
Discriminative Ability ◽  
Source Of Infection ◽  
The Difference

Abstract Background Infection with Salmonella enterica usually results in diarrhea, fever, and abdominal cramps, but some people become asymptomatic or chronic carrier as a source of infection for others. This study aimed to analyze the difference in serotype, antimicrobial resistance, and genetic profiles between Salmonella strains isolated from patients and those from asymptomatic people in Nantong city, China. Methods A total of 88 Salmonella strains were collected from patients and asymptomatic people from 2017 to 2018. Serotyping, antimicrobial susceptibility testing, and PFGE analysis were performed to analyze the characteristics of these strains. Results Twenty serotypes belonging to 8 serogroups were identified in the 88 Salmonella strains. S. Typhimurium remained to be the predominant serotype in strains from both patients and asymptomatic people. Among the 27 strains from patients, S. Enteritidis and S. Rissen were shown as the other two major serotypes, while S. London, S. Derby, and S. Meleagridis were demonstrated as the other significant serotypes among the 61 strains from asymptomatic people. Antimicrobial resistance testing revealed that 84.1% of strains from both resources were multi-drug resistant. PFGE displayed a highly discriminative ability to differentiate strains belonging to S. Derby, S. Typhimurium, etc., but could not efficiently differentiate serotypes like S. Enteritidis. Conclusions This study’s results demonstrated that S. Typhimurium could cause human infection in both symptomatic and asymptomatic state; S. London, S. Derby, and S. Meleagridis usually cause asymptomatic infection, while S. Enteritidis infection mainly results in human diseases. The high multi-drug resistance rate detected in the antimicrobial resistance and diverse PFGE profiles of these strains implied that the strains were isolated from different sources, and the increased surveillance of Salmonella from both patients and asymptomatic people should be taken to control the disease.

State and religion in a revolutionary era: perspectives and demands of the Islamic awakening†

2013 ◽  
Vol 6 (3) ◽  
pp. 325-340
Author(s):  
Ridwan Al-Sayyid
Keyword(s):  
Political Islam ◽  
The State ◽  
The Other ◽  
Revolutionary Era ◽  
The Public ◽  
Major Threat ◽  
Arab Uprisings ◽  
Holding Power ◽  
Main Disadvantage ◽  
The Relationship

This paper tackles the relationship between Islam and the state in light of the ongoing revolutions. It focuses on two perspectives: the Islamists' claim that the Shari'a and not the umma (community) are the source of legitimacy in the evolving regimes; and that it is the duty of the state to protect religion and apply the Shari'a. The main disadvantage of these propositions is that they preclude the Umma both from political power and Shari'a, thus pitting it against these two assets which become manipulated to its disadvantage by those holding power. On the other hand, an open-minded and reformist Islamic perspective believes in people regaining the prerogative to rule themselves, guided by their intellect and the public good. The main call for the Arab uprisings is to quit political Islam, which seems to be the major threat to religion, and dangerously divisive for societies.

scholarly journals Chemical markers in the aroma profiles of South Moravian red wine distillates

2012 ◽  
Vol 30 (No. 4) ◽  
pp. 369-376 ◽  
Author(s):  
L. Veverka ◽  
M. Jelínková ◽  
K. Hron ◽  
J. Balík ◽  
J. Stávek ◽  
...  
Keyword(s):  
Red Wine ◽  
Pinot Noir ◽  
The Other ◽  
Cabernet Sauvignon ◽  
Chemical Markers ◽  
The Czech Republic ◽  
Linalool Oxide ◽  
South Moravia ◽  
Log Ratio ◽  
Grape Cultivars

HSSPME-GC/MS method was used to investigate the volatile compounds responsible for varietal character in the aroma of wine distillates made from 16 different red wine grape cultivars: Andre, Blue Frankish, Merlot, Cabernet Moravia, Rubinet, Pinot Noir, Ariana, Alibernet, Laurot, Dornfelder, Blauer Portugieser, Agni, Neronet, Zweigeltrebe, Cabernet Sauvignon, and Domina. The grapes were all grown in the same vineyard in South Moravia, an important viticultural region in the south of the Czech Republic bordering Austria. The isometric log-ratio transformation was used to compute variances prior to statistical analysis, and a compositional biplot was used to interpret the data and identify the main chemical markers. A comparison of the key terpenoids present in the aroma profiles indicated that these were consistent with the known relationships between the cultivars based on their parentage. There were similarities in the terpenoid elements of the aroma profiles of Blue Frankish and its relatives Andre, Laurot, Agni, and Zweigeltrebe, which are dominated by (Z)-linalool oxide, linalool, isoborneol, terpinen-4-ol and α-terpineol. On the other hand, the aroma profiles of Pinot Noir, Blauer Portugieser, Cabernet Sauvignon and their related hybrids are dominated by o-cymene, limonene, (E)-sabinyl acetate, and (E)-calamenene.  

scholarly journals A Double Sky-Hook Algorithm for Improving Road-Holding Property in Semi-Active Suspension Systems for Application to In-Wheel Motor

2021 ◽  
Vol 11 (19) ◽  
pp. 8912
Author(s):  
Seunghoon Woo ◽  
Donghoon Shin
Keyword(s):  
Computer Simulations ◽  
Dynamic Models ◽  
Active Suspension ◽  
The Other ◽  
Driving Mode ◽  
The Road ◽  
Suspension Systems ◽  
Active Suspension Systems ◽  
Main Disadvantage ◽  
Advanced Development

This paper presents a double sky-hook algorithm for controlling semi-active suspension systems in order to improve road-holding property for application in an in-wheel motor. The main disadvantage of the in-wheel motor is the increase in unsprung masses, which increases after shaking of the wheel, so it has poor road-holding that the conventional theoretical sky-hook algorithm cannot achieve. The double sky-hook algorithm uses a combination of damper coefficients, one from the chassis motion and the other from the wheel motion. Computer simulations using a quarter and full car dynamic models with the road conditions specified by ISO2631 showed the effectiveness of the algorithm. It was observed that the algorithm was the most effective in the vicinity of the wheel hop frequency. This paper also proposed the parameter set of the double sky-hook algorithm to differentiate the driving mode of vehicles under advanced development.

scholarly journals Ground beetles (Carabidae) from slopes of Macošská stráň and Vilémovická stráň (Protected landscape area of Moravský kras, Czech Republic)

2011 ◽  
Vol 59 (3) ◽  
pp. 143-150 ◽  
Author(s):  
Jana Niedobová ◽  
Vladimír Hula ◽  
Pavla Šťastná
Keyword(s):  
Czech Republic ◽  
Endangered Species ◽  
Threatened Species ◽  
Ground Beetles ◽  
Red List ◽  
The Other ◽  
Pitfall Traps ◽  
The Czech Republic ◽  
Group A

Collecting of Carabidae was conducted using pitfall traps at four sites. The first two sites (T1 + T2) were at the slope of Macošská stráň and the other two sites (T3 + T4) at the slope of Vilémovická stráň. The study was done in 2008 and 2009. At Macošská stráň in 2008, 21 species of Carabidae with the total number of 228 individuals were found and in 2009, 18 species of the total number of 116 specimens were collected. At Vilémovická stráň in 2008, 22 species of Carabidae with the total number of 1977 specimens were found and in 2009, 21 species of the total number of 623 specimens were caught. In terms of classification of relictness, Macošská stráň in 2008 was dominated by species of adaptable group A (60%), species of eurytop group (E) were represented by 35% and of relic group (R) by 5%. In 2009, the same representation of species of groups A and E (47%) were found and the species of group R were represented by 6%. Vilémovická stráň in 2008 was dominated by species of group A (52%), species of group E were represented by 43% and of group R by 5%. In 2009 also dominated species of group A (54%), species of group E were represented by 41% and of group R by 5%. In the studied area we reported four endangered species of Carabidae protected by Law (No. 395/1992 Coll.) as amended, these were Calosoma auropunctatum (critically endangered), Brachinus crepitans, Carabus ullrichii and Cicindela campestris (endangered) and two species listed under the Red List of Threatened Species of the Czech Republic (Veselý et al., 2005). One of the species is listed as vulnerable (Calosoma auropunctatum) and one as near endangered (Carabus cancellatus). Another significant species found on the monitored sites was Aptinus bombarda.

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