scholarly journals Effect of Chemical Presevatives on Service Life of Selected Wood Species Treated against Pests and Diseases

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Ukoima N. H. ◽  
Uko E. R.
Keyword(s):  
Service Life ◽  
Wood Species ◽  
Pests And Diseases

scholarly journals Vpliv podnebnih sprememb na dinamiko glivnega razkroja lesa v Sloveniji

2021 ◽  
Vol 125 ◽  
pp. 53-59
Author(s):  
Miha Humar ◽  
Boštjan Lesar ◽  
Davor Kržišnik
Keyword(s):  
Service Life ◽  
Wood Species ◽  
Climatic Conditions ◽  
Climate Index ◽  
Fungal Decay ◽  
Monthly Average ◽  
Temperature And Precipitation ◽  
Rainy Days ◽  
Precipitation Events

The intensity of fungal decay depends mainly on wood species, temperature and precipitation events. To estimate the planned service life of wood and to determine the maintenance intervals of wooden buildings, it is necessary to assess how wood behaves in a given environment. There are a variety of models that have been developed to assess the loading of wood. The approach most commonly used in practice is that developed by Theodore Scheffer. Scheffer proposed a climate index (Scheffer climate index) based on the number of rainy days and monthly average temperatures. Based on these data, Scheffer climate index for chosen locations in Slovenia was calculated. The results of the analysis of climatic conditions show that the Schef%fer climate index is higher than it was decades ago at most of the analysed sites in Slovenia. The intensity of decomposition increased at all analysed locations, with the exception of Portorož. The largest increase in the Scheffer climate index was ob%served in Rateče.

scholarly journals Service Life of Railway Wood Sleepers in Indonesia

2018 ◽  
Vol 6 (1) ◽  
pp. 1-7
Author(s):  
Djarwanto Djarwanto ◽  
Sihati Suprapti ◽  
Sri Rulliaty
Keyword(s):  
Service Life ◽  
Wood Species ◽  
Schizophyllum Commune ◽  
Tectona Grandis ◽  
Wood Material ◽  
Railway System ◽  
Force Impact ◽  
Natural Wood ◽  
Wood Resistance ◽  
Eusideroxylon Zwageri

Wood offers natural advantages tremendously such as their elasticity, flexibility and resistance against compression as well as force impact.  Therefore, wood material is astonishingly better material than concrete for railway sleepers. In spite of wood material’s advantages, the material is susceptible to attack by organisms. This paper observes the service life of wood sleepers in Java, Indonesia. Wood sleepers were observed visually from the ground railway system, Banten Province includes wood species identification macroscopically and organism’s attack. Results reveal that natural wood resistance of the sleepers are relatively high, then sleepers were predicted to be last long. Sleepers wood species are teak (Tectona grandis), balau (Hopea sp.), merbau (Intsia bijuga), and ulin (Eusideroxylon zwageri). Sleepers were also found deteriorated by fungus during five months instalment. Decaying fungi observed are Dacryopinax sp., D. spathularia, Lentinus sp., Panus sp., Pycnoporus sp., P. sanguineus, Polyporus spp., Schizophyllum commune, and Trametes sp.

Influence of anatomy on the adhesion performance of four wood species

2020 ◽  
Vol 9 (4) ◽  
pp. e31942727
Author(s):  
João Gabriel Missia da Silva ◽  
Pedro Nicó de Medeiros ◽  
Denise Ransolin Soranso ◽  
Vinicius Peixoto Tinti ◽  
José Tarcísio da Silva Oliveira ◽  
...  
Keyword(s):  
Shear Strength ◽  
Specific Gravity ◽  
Wood Species ◽  
Tectona Grandis ◽  
Glue Line ◽  
Anatomical Characteristics ◽  
Ray Cells ◽  
Adhesion Performance ◽  
Adhesion Process

The aim of this study was to evaluate the influence of anatomical characteristics on the adhesion performance of Vatairea sp., Paulownia sp., Aspidosperma populifolium and Tectona grandis wood. Specimens for anatomical, physical and mechanical analyzes were produced from tangentially oriented boards. The treatments were joint glued from pieces of the same anatomical orientation (radial and tangential), evaluated for shear strength and glue line failure. The Vatairea sp wood had the highest specific gravity (0.74 g cm-3) and the Paulownia sp (0.34 g cm-3) wood was smaller. Aspidosperma populifolium species showed the highest shear strength in the glue line in the tangential and radial faces. The anatomical variables with higher influence on the wood adhesion process were pith ray cells and especially fibers that exhibit the greatest correlation with the shear strength of the glue line.

A Possible Basis for Nondestructive Characterization of Ropes of Nylon 6

1997 ◽  
Vol 503 ◽  
Author(s):  
H. Jiang ◽  
M. K. Davis ◽  
R. K. Eby ◽  
P. Arsenovic
Keyword(s):  
Tensile Strength ◽  
Service Life ◽  
Fiber Diameter ◽  
Structural Parameters ◽  
Crystal Form ◽  
Nylon 6 ◽  
Remaining Service Life ◽  
Nondestructive Characterization ◽  
Fractional Content

ABSTRACTPhysical properties and structural parameters have been measured for ropes of nylon 6 as a function of the number of use operations. The fractional content of the α crystal form, sound velocity, birefringence, tensile strength and length all increase systematically and significantly with increasing the number of use operations. The fractional content of the γ crystal form and fiber diameter decrease with use. These trends indicate that the measurement of such properties and structural parameters, especially the length, provide a possible basis for establishing a reliable, rapid, and convenient nondestructive characterization method to predict the remaining service life of nylon 6 ropes.

Development of Approaches to Solving the Problems of Ensuring Strength, Service Life and Safety of the Trunk Oil Transportation

2019 ◽  
pp. 7-14 ◽  
Author(s):  
N.A. Makhutov ◽  
◽  
Ya.M. Fridlyand ◽  
A.A. Raspopov ◽  
M.V. Lisanov ◽  
...  
Keyword(s):  
Service Life ◽  
Oil Transportation

CARBONATION INDUCED CORROSION ANALYSIS OF REINFORCED CONCRETE STRUCTURES BASED ON FULL PROBABILISTIC APPROACH – AN INDONESIAN CASE STUDY

2018 ◽  
Vol 4 (1) ◽  
pp. 165
Author(s):  
Herry Prabowo ◽  
Mochamad Hilmy
Keyword(s):  
Service Life ◽  
Probabilistic Approach ◽  
Concrete Structures ◽  
Weather Condition ◽  
Analysis Data ◽  
National Standard ◽  
Concrete Carbonation ◽  
Durability Design ◽  
Starting Point ◽  
Real Performance

The assessment of the service life of concrete structures using the durability design approach is widely accepted nowadays. It is really encouraged that a simulation model can resemble the real performance of concrete during the service life. This paper investigates the concrete carbonation through probabilistic analysis. Data regarding Indonesian construction practice were taken from Indonesian National Standard (SNI). Meanwhile, data related to Indonesian weather condition for instance humidity and temperature are taken from local Meteorological, Climatological, and Geophysical Agency from 2004 until 2016. Hopefully the results can be a starting point for durability of concrete research in Indonesia.

Functional and operational risk as a criterion for assessing the durability of an autonomous energy system

2019 ◽  
Vol 12 (1) ◽  
pp. 56-62 ◽  
Author(s):  
A. O. Nedosekin ◽  
A. V. Smirnov ◽  
D. P. Makarenko ◽  
Z. I. Abdoulaeva
Keyword(s):  
Service Life ◽  
Structural Reliability ◽  
Residual Life ◽  
Fuzzy Random Variable ◽  
Operational Risk ◽  
Energy System ◽  
Technical System ◽  
Residual Service Life ◽  
Technological Parameters ◽  
Residual Service

The article presents new models and methods for estimating the residual service life of an autonomous energy system, using the functional operational risk criterion (FOR). The purpose of the article is to demonstrate a new method of durability evaluation using the fuzzy logic and soft computing framework. Durability in the article is understood as a complex property directly adjacent to the complex property of system resilience, as understood in the Western practice of assessing and ensuring the reliability of technical systems. Due to the lack of reliable homogeneous statistics on system equipment failures and recoveries, triangular fuzzy estimates of failure and recovery intensities are used as fuzzy functions of time based on incomplete data and expert estimates. The FOR in the model is the possibility for the system availability ratio to be below the standard level. An example of the evaluation of the FOR and the residual service life of a redundant cold supply system of a special facility is considered. The transition from the paradigm of structural reliability to the paradigm of functional reliability based on the continuous degradation of the technological parameters of an autonomous energy system is considered. In this case, the FOR can no longer be evaluated by the criterion of a sudden failure, nor is it possible to build a Markov’s chain on discrete states of the technical system. Assuming this, it is appropriate to predict the defi ning functional parameters of a technical system as fuzzy functions of a general form and to estimate the residual service life of the technical system as a fuzzy random variable. Then the FOR is estimated as the possibility for the residual life of the technical system to be below its warranty period, as determined by the supplier of the equipment.

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