Testing of the condensation characteristics and light transmissions of different plastic film covering materials

Cemek, Bilal; Demir, Yusuf

doi:10.1016/j.polymertesting.2004.11.007

Cited by 42 publications

(25 citation statements)

References 10 publications

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“…It was also concluded that an increase in condensation area results in a reduction in the light transmission of covering plastics. 23 Gandhidasan and Abualhamayel offered a renewable method for harvesting fresh water as dew from the atmosphere by using 26 The inverted pyramid-shaped collector was built to reduce the view angle to only the nighttime sky; however, it was found that the collected water difference between them was only 5%.…”

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confidence: 99%

Droplet condensation on polymer surfaces: A review

UÇAR¹

2013

Turk J Chem

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A novel root inclusion net method was designed to determine the fine root productions and turnover rates of 13-, 22-, and 38-year-old Larix principis-rupprechtii plantations in the whole growing season of 2012, and it was compared with the results of the sequential coring method and in-growth core method. All following values are reported in order for 13-, 22-, and 38-year-old L. principis-rupprechtii plantations. The mean values of fine root biomasses were 103, 261, and 356 g m -2 , about 76-78% of which were live fine root biomasses. The fine root productions were 86-118 g m -2 year -1 , 124-138 g m -2 year -1 , and 134-160 g m -2 year -1 , respectively. The fine root turnover rates were 1.12, 0.61, and 0.51 times year -1 , respectively, suggesting a relative slow fine root turnover in L. principisrupprechtii plantations. The carbon inputs into soil accompanying fine root turnover were 52, 58, and 94 g C m -2 year -1 . This organic carbon is a sizeable pool in the forest ecosystem. The results suggest that our new modified root inclusion net method is suitable for field-based assessment of fine root production and turnover.

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confidence: 99%

Droplet condensation on polymer surfaces: A review

UÇAR¹

2013

Turk J Chem

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“…As soil does contain water, condensation on the surface of the film can occur due to the difference in temperature between the air and the plastic film. The presence of water condensation can influence the degradation of the film by changing light intensity due to sunlight reflection and environmental stress cracking effects . Condensation on the surface of the film reduces solar transmission by 13%, compared with dry film .…”

Section: Resultsmentioning

confidence: 99%

Effect of soil environment on the photo‐degradation of polyethylene films

Gauthier

Nikolić

Truss

et al. 2015

J of Applied Polymer Sci

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Outdoor weathering field trials performed with oxo-degradable polyethylene (PE) thin films were conducted across temperate, grassland, and subtropical sites around Australia. It was found that a site factor, that was apparently independent of total solar dose and temperature, significantly impacted the rate and extent of photo-oxidation. Controlled laboratory-based accelerated aging trials of both PE film with no prodegradant and oxo-degradable PE films (containing iron stearate) revealed that the rate and extent of PE photo-oxidation did not correlate with temperature under the film or UV exposure, but was soil dependent. Under accelerated photo-oxidative conditions, the time to reach embrittlement for a PE film aged over the soil from the temperate site (OM 8.4) was half (24.5 days) the time taken when aged over air (48 days). Further investigation revealed that humic acids and fulvic acids within soil organic matter may contribute to an increased rate of PE photo-oxidation, possibly through the formation of volatile reactive oxygen species that may form under photo-oxidative conditions. The presence of water also had a significant impact on the rate of photo-oxidation. Overall, the impact of soil on PE photo-oxidation was found to be complex and likely dependent at least in part on soil components that varied between different soil types, consequently influencing their photo-chemistry. V C 2015 Wiley Periodicals, Inc. J.Appl. Polym. Sci. 2015, 132, 42558.

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“…Örtü malzemeleri 700 nm dalga boyundaki ölçümler dikkate alınarak karşılaştırıldıklarında, Kittas and Baille (1998)'nin düşük yoğunluklu PE için bulduğu %83, Geoola et al (2004)'nın katkılı PE'ler için bulduğu %83.6  80.4 değerlerine göre daha düşük bulunmuş, ancak Cevri ve Başçetinçelik (2000) tarafın-dan Antalya yöresinde yapılan çalışmada bulunan sonuçlar ile yakın benzerlik göstermiştir. Yeni örtü malzemesi örneklerinde ışık geçirgenlik değerlerindeki farklılıklar üzerinde firmaların malzeme üretim proseslerinin önemli bir rol oynadığı, ışık geçirgenliği değer-lerinin düşük çıkmasında Takakura and Fang (2002), Geoola et al (2004) ve Cemek and Demir (2005)'de işa-ret ettikleri gibi katkı maddesi kullanımı, malzeme kalınlığı ve yoğunluğunun da etkili olduğu söylenebilir.…”

Section: öRtü Malzemelerinin Optik öZellikleriunclassified

“…Geoola et al (2004), 0.14 mm'den daha ince UV, UV+IR ve UV+IR+AD katkılı plastik film malzemelerin ortalama güneş ışınımı geçirgenliklerini sırasıyla %83.6, %80.5 ve 80.4 olarak bulmuşlardır. Cemek and Demir (2005), Samsun koşullarında tesis ettikleri model seralarda üç ay süreyle test ettikleri çeşitli plastik film malzemelerinde ışık geçirgenlik değerlerinin (kuru koşullarda); kirlilik nedeniyle katkısız PE'de %9.2 (%89.1-%81.0), UV katkılı PE'de %10.6 (%87.2-%78.0) ve IR katkılı PE'de %12.7 (%85.4-%74.5) oranında azaldığını ve bu azalmanın katkılı PE filmlerde daha fazla olduğunu belirlemişlerdir. Cevri ve Başçetinçelik (2000), Antalya yöre-sinde değişik çatı tipli, cam ve plastik örtüyle kaplı toplam on farklı serada toplam ışınım ve FAR geçir-genliklerinin, örtü malzemesine göre %55 ile %78 arasında değişim gösterdiğini belirtmişlerdir.…”

Section: Introductionunclassified