https://hdl.handle.net/20.500.12809/8873 2026-04-20T12:49:32Z https://hdl.handle.net/20.500.12809/10974 Influence of pumice powder on some properties of phenol-formaldehyde bonded particleboards Aras, Uğur; Durmaz, Sefa; Kuştaş, Süleyman; Kalaycıoğlu, Hülya In this study, pumice powder as a volcanic aggregate was added in the particleboards' production. The effect of various ratios of pumice powder (10%, 20%, 30%, and 40%) on physical, mechanical, thermal and fire resistance properties was investigated. Pumice powder did not significantly affect particleboards' water absorption and thickness swelling values. However, the mechanical properties were significantly affected with raising pumice powder content. The modulus of rupture and modulus of elasticity decreased up to 46% and 45%, respectively. There was also a decrease in the internal bond strength up to 42%. Conversely, pumice powder improved the thermal degradation temperatures. The onset temperatures increased with increasing pumice powder content above 300°C. Similarly, the pumice powder improved the fire resistance of particleboards up to 7% compared to control samples. 2023-01-01T00:00:00Z https://hdl.handle.net/20.500.12809/10680 Determination of The Essential Oil Components of Some Sage (Salvia Sp.) Species Naturally Distributed in The Isparta Province Tığlı Kaytancıoğlu, Ebru Hatice; Özderin, Sevgin; Fakir, Hüseyin; Erbaş, Sabri Aim of the study: This study was performed to determine the essential oil components of Salvia Area of study: The study was carried out in two districts (Egirdir and Sarkikaraagac) located at Isparta province in Turkey. Material and methods: The isolation of essential oil components was performed from shoots with leaves and flowers. Qualitative analysis of essential oils was carried out by using a Shimadzu 2010 Plus GC-MS device. The identification of the constituents was carried out by comparing the retention index (RI) and mass spectral data (MS) to those reported in the literature. Main results: As a result of the GC-MS analysis, the major components of the essential oil were (-)caryophyllene oxide (49.56%), beta-vatirenene (7.87%), and alpha-Muurolol (6.78%) in S. tomentosa, sclareol (40.01%), germacrene-D (13.93%) and beta-pinene (11.93%) in S. argentea and eucalyptol (1,8-cineole) (16.6%), beta-pinene (14.7%) and cembrene (10.88%) in S. bracteata. Sclareol, which was determined at a high concentration in S. argentea in this study, is an economically valuable component that is widely used as flavoring in food and tobacco industry and as a perfume ingredient in the cosmetic industry. Highlights: According to this study, the cultivation of S. argentea can provide high economic returns.; Çalışmanın amacı: Bu çalışmada Salvia tomentosa Mill., Salvia argentea L. ve Salvia bracteata Bank et Sol. taksonlarının uçucu yağ bileşenlerinin belirlenmesi amaçlanmıştır. Çalışma alanı: Çalışma Türkiye'de Isparta ilinde bulunan iki ilçede (Eğirdir ve Şarkikaraağaç) gerçekleştirilmiştir. Materyal ve yöntem: Uçucu bileşiklerin izolasyonu, yaprak, çiçek ve sürgünden oluşan kısımlardan yapılmıştır. Uçucu yağların kalitatif analizi, Shimadzu 2010 Plus GC-MS (Gaz Kromatografisi/Kütle Spektrometresi) cihazı kullanılarak yapılmıştır. Bileşenlerin tanımlanması, alıkonma indeksi (RI) ve kütle spektral verilerinin (MS) yayınlanan literatürde rapor edilenlerle karşılaştırılmasıyla gerçekleştirilmiştir. Temel sonuçlar: GC-MS analizi sonucunda uçucu yağın ana bileşikleri (-)-karyofillen oksit (%49.56), β-vatirenen (%7.87), S. tomentosa'da α-Muurolol (%6.78), sclareol (40.01), germacrene-D (%13.93) ve β-pinene (%11.93), S. argentea'da ve okaliptol (1,8-sineole) (%16.60), β-pinene (%14.70) ve cembrene (%10.88) S. bracteata olmuştur. Bu çalışmada S. argentea'da yüksek konsantrasyonda tespit edilen sclareol, gıda ve tütün endüstrisinde aroma verici ve kozmetik endüstrisinde parfüm bileşenin olarak kullanılan ekonomik değeri olan bir bileşiktir. Araştırma vurguları: Bu çalışmaya göre S. argentea yetiştiriciliği yüksek ekonomik getiri sağlayabilir. 2023-01-01T00:00:00Z https://hdl.handle.net/20.500.12809/9980 Noise Reduction Provided by Trees in an Urban University Campus Taş, İnanç; Büyüksakallı, Halit In urban universities, there are various noise sources such as roads, railways, construction activities that disturb staffs and students and cause undesirable environment for higher education. In this study, noise reduction effects of trees were investigated in the urban campus of Bursa Technical University (BTU) located in Yıldırım province of Bursa, Turkey. The campus was surrounded by a major inter-city road with a heavy traffic at the north and there is a large hospital at the south. There is a tree fence along the north boarder and there are groups of trees particularly at the north. In field study, the peak noise level data were collected for 5 minutes in two periods (Morning: 09:00-11:00 and Afternoon: 14:00-16:00) from total of 64 points which were homogenously distributed in the campus. Additional noise data were also collected from outside and inside of tree fence along the north border and from midpoint of each tree group. The coordinates of the noise data points were recorded by a GPS and a noise level layer was generated in ArcGIS 10.4.1. Then, noise map of campus was generated using kriging function based on spatial interpolation of noise data. The results indicated that the average peak noise level was 65.6 dBA in the morning period and 66.1 dBA in the afternon period. The maximum peak noise level of 103.6 dBA was reached in the morning period, while maximum peak noise level was 101.6 dBA in the afternoon period. The average peak noise level within the tree groups were 53.7 dBA (maximum 59.3 dBA) and 54.1 dBA (maximum 61.3 dbA) in two periods, respectively. It was also found that tree fences reduced the noise level by 24.9 dBA and 26.3 dBA in two periods, respectively. The results revealed that trees within urban campus are important to reduce noise effect. 2021-01-01T00:00:00Z https://hdl.handle.net/20.500.12809/9876 Determination of Some Chemical Properties of Wild Pear (Pyrus spinosa Forsk.) Özderin, Sevgin Wild pear plant species Pyrus spinosa Forsk., naturally grown in woodlands in Turkey, are one of the most important wild fruits consumed by local people as food, as well as used for medical purposes. In this study, some chemical properties were determined such as fruit seed and fruit pulp antioxidant and antimicrobial activities, fruit seed fatty acid components of Pyrus spinosa determined, which grow naturally in Odemis, Izmir, in the south of Turkey. The qualitative and quantitative analyses of fatty acid components of fruit seed of P. spinosa were determined by GC/MS analysis. A total of 16 fatty acids in the fruit seed were found in the analysis results and 44.8% linoleic acid (C18:2n6c), 40.5% oleic acid (C18:1n9c), and 7.6% palmitic acid (C16:0) components were found in higher proportions. Free radical removal effects of fruit seed and fruit pulp extracts were determined using the DPPH method. The antimicrobial activity of fruit pulp extract of P. spinosa was determined by the disk diffusion method against E. coli, S. aureus, and C. albicans. This study revealed that the fruit pulp and fruit seed of P. spinosa, which had a significant level of antioxidant activity, antimicrobial activity, and fruit seed had high levels fatty acids components. 2022-01-01T00:00:00Z