Daily Cycle of Air Temperature and Relative Humidity Effect to Creep Deflection of Wood Component of Low-cost House in Cibeureum-Bogor, West Java, Indonesia

2014 ◽  
Vol 7 (4) ◽  
pp. 501-512 ◽  
Author(s):  
Effendi Tri Bahtiar ◽  
Arinana . ◽  
Naresworo Nugroho ◽  
Dodi Nandika
Keyword(s):  
Relative Humidity ◽  
Air Temperature ◽  
Low Cost ◽  
Daily Cycle ◽  
West Java ◽  
Humidity Effect ◽  
Wood Component ◽  
Relative Humidity Effect

scholarly journals The influence of atmospheric conditions on the migration of diesel fuel spilled in soil

2017 ◽  
Vol 43 (1) ◽  
pp. 73-79
Author(s):  
Mladen Vuruna ◽  
Zlate Veličković ◽  
Sreten Perić ◽  
Jovica Bogdanov ◽  
Negovan Ivanković ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Air Temperature ◽  
Diesel Fuel ◽  
Soil Depth ◽  
Petroleum Products ◽  
Atmospheric Conditions ◽  
Humidity Effect ◽  
Relative Humidity Effect ◽  
Fuel Evaporation ◽  
The Impact

Abstract The most common chemical’s spills in typical transportation accidents are those with petroleum products such as diesel fuel, the consequence of which is an extensive pollution of the soil. In order to plan properly fuel recovery from the soil, it is important to gain information about the soil depth which may be affected by pollutant and to predict the pollutant concentration in different soil layers. This study deals with the impact of basic atmospheric conditions, i.e. air temperature and humidity on the diesel fuel migration through the soil. The diesel fuel was spilled into columns (L = 30 cm; D = 4.6 cm) filled with sandy and clay soil samples, and its concentrations at various depths were measured after 11 days under various air temperature (20 and 40°C) and relative humidity (30–100%) conditions. The effects observed were explained by understanding physical processes, such as fuel evaporation, diffusion and adsorption on soil grains. The increase in temperature results in higher fuel evaporation loss and its faster vertical migration. The relative humidity effect is less pronounced but more complex, and it depends much on the soil type.

scholarly journals Long-Term Performance Assessment of Low-Cost Atmospheric Sensors in the Arctic Environment

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1919 ◽  
Author(s):  
Federico Carotenuto ◽  
Lorenzo Brilli ◽  
Beniamino Gioli ◽  
Giovanni Gualtieri ◽  
Carolina Vagnoli ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Relative Humidity ◽  
Air Temperature ◽  
Meteorological Parameters ◽  
Low Cost ◽  
Absolute Error ◽  
Atmospheric Composition ◽  
The Arctic ◽  
Svalbard Archipelago ◽  
Arctic Environment

The Arctic is an important natural laboratory that is extremely sensitive to climatic changes and its monitoring is, therefore, of great importance. Due to the environmental extremes it is often hard to deploy sensors and observations are limited to a few sparse observation points limiting the spatial and temporal coverage of the Arctic measurement. Given these constraints the possibility of deploying a rugged network of low-cost sensors remains an interesting and convenient option. The present work validates for the first time a low-cost sensor array (AIRQino) for monitoring basic meteorological parameters and atmospheric composition in the Arctic (air temperature, relative humidity, particulate matter, and CO2). AIRQino was deployed for one year in the Svalbard archipelago and its outputs compared with reference sensors. Results show good agreement with the reference meteorological parameters (air temperature (T) and relative humidity (RH)) with correlation coefficients above 0.8 and small absolute errors (≈1 °C for temperature and ≈6% for RH). Particulate matter (PM) low-cost sensors show a good linearity (r2 ≈ 0.8) and small absolute errors for both PM2.5 and PM10 (≈1 µg m−3 for PM2.5 and ≈3 µg m−3 for PM10), while overall accuracy is impacted both by the unknown composition of the local aerosol, and by high humidity conditions likely generating hygroscopic effects. CO2 exhibits a satisfying agreement with r2 around 0.70 and an absolute error of ≈23 mg m−3. Overall these results, coupled with an excellent data coverage and scarce need of maintenance make the AIRQino or similar devices integrations an interesting tool for future extended sensor networks also in the Arctic environment.

scholarly journals A Field Study of Atmospheric Corrosion of Carbon Steel after Short Exposure in Pelabuhan Ratu, West Java Province, Indonesia

2021 ◽  
Vol 18 (17) ◽  
Author(s):  
Gadang PRIYOTOMO ◽  
Siska PRIFIHARNI ◽  
Lutviasari NURAINI ◽  
Joko TRIWARDONO ◽  
Ahmad ROYANI ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Relative Humidity ◽  
Air Temperature ◽  
Atmospheric Corrosion ◽  
Short Exposure ◽  
Corrosion Attack ◽  
West Java ◽  
Corrosion Rates ◽  
Magnetite Fe3o4 ◽  
Chloride Deposition

The investigation of atmospheric corrosion of mild carbon steel as representative of offshore infrastructure has been carried out in the marine tropical of Pelabuhan Ratu, West Java, Indonesia. They are exposed up to 76 days of periods, and their corrosion rates are determined according to ASTM G1-03. The surface morphology, the elemental compositions and compounds were observed using a scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), respectively.  The environmental parameters of the test site are monitored during exposure, such as air temperature, relative humidity (RH), airborne salinity and dew temperature. Based on the results, the corrosion rates of steels were 2.79 and 2.8 mpy within the 27 and 76 days exposures, respectively. The presence of chloride deposition on the surface of steel can increase the severity of corrosion. Moreover, the detrimental effect of chloride was observed in rust product, which was covered by an oxygen element. The main phases of rust products present were magnetite (Fe3O4) and hematite (α-Fe2O3.H2O). Several cracks were observed in the rust layer, which tended to exfoliate and lose adherence and protectiveness from further corrosion attack. HIGHLIGHTS The presence of chloride deposition on the surface of steel can increase the severity of corrosion. The severity of corrosion attack mainly depends on the exposure time and some climatic parameters, such as relative humidity (RH), air temperature and chloride airborne. The uniform distribution of the chloride tends to increase the production of ferrous chloride in high RH condition and the aqueous layer deposited on carbon steel. There are two phases on corroded carbon steel such as hematite (α-Fe2O3.H2O) and Magnetite (Fe3O4) after exposure GRAPHICAL ABSTRACT

Thermogravimetric study of sequential carbonation and decarbonation processes over Na2ZrO3 at low temperatures (30–80 °C): relative humidity effect

RSC Advances ◽  
2016 ◽  
Vol 6 (71) ◽  
pp. 66579-66588 ◽  
Author(s):  
J. Arturo Mendoza-Nieto ◽  
Heriberto Pfeiffer
Keyword(s):  
Solid State ◽  
Relative Humidity ◽  
Low Temperature ◽  
Low Temperatures ◽  
Humidity Effect ◽  
Temperature Range ◽  
Thermogravimetric Study ◽  
Relative Humidity Effect

Na2ZrO3 was synthetized via solid-state and tested in a low temperature range (30–80 °C) for carbonation and decarbonation processes using RH values between 0 and 80%. Results confirm that it is possible to accomplish successively at least 8 cycles.

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