Sürdürülebilir Kalkınma Amaçları
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- MakaleAçık Erişim2024Determination of optical properties of ovangkol (Guibourtia ehie (a.chev.) j.léonard) wood treated with oxalic acid and hydrogen peroxide
Ayata, Ümit; Camlibel, Osman
Ovangkol wood, an exotic wood species, is becoming valuable in the woodworking industries, particularly in the furniture sector. Bleaching treatments alter the color of the wood. In this study, changes in certain surface properties [whiteness index (WI*), glossiness, and color parameters (lightness (L*), red color (a*) tone, yellow color (b*) tone, chroma (C*), and hue angle (ho))] were investigated by applying two different bleaching chemicals [oxalic acid (C2H2O4) and hydrogen peroxide (H2O2) + sodium hydroxide (NaOH)] on ovangkol (Guibourtia ehie (A.Chev.) J.Léonard) wood surfaces. According to the results, increases in WI* in the parallel direction and all color parameters were observed with the C2H2O4 chemical. Additionally, with the NaOH + H2O2 solution, increases in L* and ho values were achieved, while decreases in a*, C*, and b* parameters were observed. When using the C2H2O4 chemical, the ∆E* value was recorded as 4.25, whereas it was determined as 13.14 for treatments with solutions containing H2O2 + NaOH. Positive changes in ∆L* values were observed with both chemicals. However, positive ∆a*, ∆b*, and ∆C* values were observed with the C2H2O4 chemical, while these values were negative with the NaOH + H2O2 solution. The glossiness values decreased at both 60° and 85° angles regardless of whether the bleaching agents were applied parallel or perpendicular to the wood fibers.
- MakaleAçık Erişim2024Usability of calcite mineral, which develops in the crack fillings of carbonate rocks, as ornamental stone
Camuzcuoğlu, Murat
Turkey has a significant amount of mineral content from a geological perspective, offering essential resources, especially in mining (ornamental stone production). In this study, methods are being developed for the extraction, processing, and usability of calcite minerals, which develop as vein fillings (secondary formations) among fragmented limestone along the Bayburt-Erzurum highway for ornamental stone use. The chemical and crystallographic properties of the mineral were determined through XRD and FTIR analyses, and its suitability for ornamental stone use was evaluated. (durable, clean, and transparent) epoxy was used as a binding material for ornamental stone production, and the use of calcite minerals in jewelry production was examined, revealing its potential economic value in terms of durability, aesthetics, and rarity. Generally, while calcite minerals are widely used in various industrial fields, their use as ornamental stones remains limited. This study presents a new perspective on evaluating calcite minerals as ornamental stones, demonstrating the possibility of processing a low-hardness mineral as an ornamental stone using binding materials and its potential economic value. These findings significantly evaluate natural minerals in different applications and enhance their financial potential.
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İncele - MakaleAçık Erişim2022Dış ortam şartlarına maruz kalmış kızılçam odununda meydana gelen bazı yüzey özelliklerinin araştırılması
Ayata, Ümit
Günümüzde ahşap malzemeler üzerinde doğal ve yapay yaşlandırma uygulamalarına ait çalışmalar yapılmaktadır. Aynı ağaç türü bile farklı dış ortamlara bırakıldığında farklı sonuçlar göstermektedir. Dış ve iç ortam testleri sonrasında ahşap malzeme yüzeylerinde değişiklikler meydana gelmektedir. Bu çalışma, Bayburt ili 3 ay süre ile dış ortam çevre şartlarına maruz kalmış kızılçam (Pinus brutia) odununda meydana gelen bazı yüzey değişiklerinin araştırılması üzerine yapılmıştır. Yaşlandırma işlemi sonralarında ve öncesinde ahşap malzemelerde renk (ΔL*, Δa*, Δb*, ΔH*, ΔC*, ΔE*, L*, a*, b*, C* ve ho), parlaklık (20o, 60o ve 85o’de liflere dik ve paralel) ve beyazlık indeksi (liflere dik ve paralel) değerleri belirlenmiştir. Elde edilen sonuçlara göre, Bütün testler için hesaplanmış olan varyans analizi sonuçlarının anlamlı olduğu görülmüştür. Kontrol ölçümlerine kıyasla yaşlandırma sürelerinin artması sonrasında, liflere dik ve paralel beyazlık indeksi değerleri, L* ve a* değerleri azalırken, C*, ho ve b* değerlerinin arttığı görülmektedir. Buna ek olarak, 1. ay, 2. ay ve 3. ay sonunda ΔE* değerleri sırasıyla 10.60, 10.58 ve 11.65 olarak belirlenmiştir. Sonuç olarak renk, parlaklık ve beyazlık indeksi değerleri yaşlandırma uygulamaları ile değişmiştir.
AtıfOpenAlex3İncele - MakaleAçık Erişim2021Determination of Some Heavy Metals in Oil Sunflower Seeds Grown in the North of Turkey
Kul, Sinan; Gül, Volkan
This study aims to determine some heavy metal contents (boron, aluminum, manganese, iron, cobalt, nickel, copper, zinc, cadmium, and lead) of eighteen sunflower seeds obtained from six regions in the Middle Black Sea Region where sunflower is grown. The ICP- MS device was used to determine the heavy metal concentrations in the study, and cadmium, and lead amounts in the samples examined at the end of the study were found in the range of 0-0.06 μg kg-1 and 0-1.07 μg kg-1, respectively. The highest heavy metal concentrations in all the examples were obtained as iron (13.14-61.04 μg kg-1), zinc (34.11-54.12 μg kg-1), copper (15.68-20.7 μg kg-1), and manganese (12.72-20.20 μg kg-1). These heavy metals were followed by boron (4.82-10.33 μg kg-1), aluminum (0-13.12 μg kg-1), and nickel (0.88- 7.74 μg kg-1). The lowest heavy metal concentration was cobalt (0.037-0.12 μg kg-1). As a result, the heavy metal concentrations found in the sunflower seeds grown in the Middle Black Sea region were lower than the limit values threading to human health.
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