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Tekat Dwi Cahyono
Universitas Darussalam Ambon
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Social Sciences Other

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Analisis Modulus Geser dan Pengaruhnya terhadap Kekakuan Panel Laminasi Kayu Samama (Antocephallus Macrophyllus) Cahyono, Tekat Dwi; Wahyudi, Imam; Priadi, Trisna; Febrianto, Fauzi; Ohorella, Syarif
Jurnal Teknik Sipil Vol 21, No 2 (2014)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (229.381 KB)

Abstract

Abstrak. Modulus geser perlu dijadikan pertimbangan pada produkkayu, khususnya untuk desain yang memiliki rasio tinggi/panjang bentangnya besar.Penelitian ini mendesain 6 tipe panel laminasi kayu Samama (Antocephallus macrophyllus), menganalisis modulus geser dan pengaruhnya terhadap nilai kekakuan (MOEstatis) masing-masing panel laminasi. Hasilnya kemudian dibandingan dengan kekakuan hasil pengujian non destruktif (MOEd). Hasil penelitian menunjukkan bahwa modulus geser panel laminasi kayu Samama memberikan pengaruh sebesar 2 - 8% terhadap kekakuan kayu Samama, tergantung pada tipe laminasi dan panjang bentangnya. Sementara itu nilai pengujian non-destruktif memiliki nilai yang lebih besar 11 - 20% dibandingan dengan kekakuan panel laminasi kayu Samamayang telah terkoreksi oleh modulus geser. Abstract. Shear modulus need to be considered in designing wood product that has high ratio of height/length. This study designed 6 types of panel lamina made of Samama wood (Antocephallus macrophyllus). The shear modulus was measured and its effect on the stiffness (MOE static) was analyzed in comparison to those of non-destructive test (MOEd). The results showed that shear modulus affected the stiffness of the laminas by 2-8%;the value was determined by the type of lamination and the length of span. Meanwhile, non-destructive test showedthat the laminas had 11-20% of higher stiffness than those of laminas with shear modulus corrected-stiffness.
Sudut Kontak dan Keterbasahan Dinamis Kayu Samama pada Berbagai Pengerjaan Kayu Cahyono, Tekat Dwi; Wahyudi, Imam; Priadi, Trisna; Febrianto, Fauzi; Ohorella, Syarif
Jurnal Teknik Sipil Vol 24, No 3 (2017)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1741.771 KB) | DOI: 10.5614/jts.2017.24.3.3

Abstract

AbstrakSudut kontak dan keterbasahan dinamis penting diketahui untuk menganalisis keteguhan rekat. Penelitian ini bertujuan mengetahui sudut kontak dan keterbasahan dinamis kayu samama pada berbagai pengerjaan kayu. Metode yang digunakan adalah meneteskan air destilata, perekat UF dan isosianat dengan ukuran tertentu pada permukaan kayu hasil gergaji dan hasil mesin kupas. Permukaan kayu gergajian yang ditetesi oleh cairan adalah permukaan radial, tangensial dan permukaan yang membentuk sudut 45° antara radial dan tangensial. Sementara itu permukaan finir hasil pengupasan adalah permukaan tight dan loose. Kayu gergajian maupun finir yang dianalisis pada penelitian ini, keduanya diambil dari bagian juvenil dan dewasa. Keterbasahan dinamis dianalisis menggunakan model SD. Hasil penelitian menunjukkan bahwa porositas permukaan bahan berpengaruh terhadap keterbasahan kayu samama oleh cairan. Permukaan tangensial memiliki sifat yang lebih mudah mengalami keterbasahan dibandingkan dengan permukaan radial maupun TR (permukaan antara radial dan tangensial) sementara bagian juvenil memiliki tingkat keterbasahan lebih baik dibandingkan dewasanya. Finir samama memiliki tingkat keterbasahan setara dengan permukaan TR kayu samama dimana bagian juvenil finir memiliki laju keterbasahan yang lebih baik dibandingkan dengan finir dewasa. Disamping itu, bagian loose finir lebih cepat terbasahi oleh cairan dibandingkan bagian tight.AbstractContact angle and dynamic wettability is important in determining bonding strength, therefore, this study addressed contact angle and dynamic wettability of samama wood in various woodworking. Method used in the study was by dripping distill water, UF and isocyanate adhesives in particular size on the surface of wood processed by circular saw and peeling machine. The surfaces of sawn wood which dripped by those liquids were radial, tangential, and surface which made a 45° angle between radial and tangential. Meanwhile the tested surfaces of peeled-veneer were tight and loose surfaces. Both sawn wood and veneer in this study were taken from juvenile and mature part of the samama wood. Dynamic wettability was analyzed using SD model. The results showed that porosity of the surface significantly affected the wettability of samama wood by liquid. The profile of tangential surface made it had a better wettability than radial and TR (i.e. surface between radial and tangential) surfaces. Meanwhile, juvenile part showed better wettability than the mature one. The samama veneer had equal wettability with TR surface of sawn wood in which the juvenile one showed better wettability than the mature veneer. Further, it was noticed that loose surface of the veneer was wetted faster than the tight one.
Keeratan Hubungan antara Dimensi Sarang Bambu dan Perkembangbiakan Lebah Trigona sp. (Correlation of Bamboo Nest Dimension and Trigona sp. Bee Productivity) Kapitanhitu, Rusli; Cahyono, Tekat Dwi; Kaliky, Fitriyanti
Jurnal Riset Industri Hasil Hutan Vol 10, No 2 (2018)
Publisher : Kementerian Perindustrian

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (859.728 KB) | DOI: 10.24111/jrihh.v10i2.4231

Abstract

The Trigona sp. bees do not require specific breeding treatment. Nevertheless, selection of shade, container or media to cultivate this stingless bee can be engineered to increase the production of honey. This study was aimed to determine the effect of diameter, length, and thickness of bamboo used as a beehive of Trigona sp. The beehive was prepared from 54 thorny bamboo’s culms with various sizes. Hole was made on the culms where the queen and propolis could be inserted into the culms. Those inserted culms were then put in the cultivation place. The honey resulted from each culm was calculated after 4 months of the cultivation. The results showed that total honey production, HPB (honey, propolis, bee bread), and bee bread were 221.3 g, 792.7 g, and 33.8 g. Regression analysis revealed that there wa a significant effect of bamboo’s diameter on honey production, but not on bee bread, egg’s weight and HPB. Recommended diameter of bamboo culms for the cultivation of Trigona sp. was about 6-12 cm to obtain better quantity of honey
Penilaian Bangunan Masjid Tua Wapauwe di Desa Kaitetu, Maluku Tekat Dwi Cahyono; Fitriyanti Kaliky; Narti Kawarnidi
Jurnal Ilmu Pertanian Indonesia Vol. 23 No. 2 (2018): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (897.53 KB) | DOI: 10.18343/jipi.23.2.158

Abstract

Historical tour is one of supporting aspects in tourism industry, locally and nationally. Old mosque of Wapauwe at Kaitetu Village of Central Maluku Regency, Maluku Province, is one of historical tour destinations that offers beautiful architecture and wood structure. Even though the main building is only 10 x 10 m2, this is one of important relics of Maluku’s Islamic culture richness that stands and is well maintained since its building in 1414 AD. A structure surely will deteriorate during utilization, therefore a study on the durability of old Wapauwe Mosque building was conducted. Forensic method was employed in all of building components and the results were subsequently compared in the standard of proper building. The results revealed that the building was still in well category and fit for proper use. The structure of columns, walls, and roof frame were still quite sturdy and well maintained, yet symptoms of water capillarity were appeared on few parts of the walls and building foundation. The building was built from several wood species namely Nani (Xanthostemon verus), Linggua (Pterocarpus indicus), Red meranti (Shorea pinanga) and Bintanggur (Calophyllum inophyllum). The study recommends a moderate maintenance is required in roof that was noticeably suffered a little damage and particular method on preventing and inhibiting dampness on walls and foundation. Moreover, subsequent study will be required in wood anatomy structure, creep test and wood ages in determining wood durability in longer term.
STABILISASI DIMENSI KAYU DENGAN APLIKASI PARAFIN CAIR . Syahidah; Tekat Dwi Cahyono
PERENNIAL Vol. 4 No. 1 (2008)
Publisher : Forestry Faculty of Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24259/perennial.v4i1.178

Abstract

Wood is a special material which can swell and shrink with the change of environmental humidity. The aim of this research was to enhance the dimensional stability of wood. Clear specimens of jackfruit wood (Artocarpus heterophyllus) ) measuring 15 cm (L) x 2 cm (R) x 2 cm (T) and mangium wood (Acacia mangium Wild.) measuring 5 cm (L) x 5 cm (R) x 5 cm (T) were prepared for treatment. The samples were firstly soaked in a liquid paraffin with 0% concentration (100% kerosene soluble), 33.3 %, 66,6% and 100%. All samples were then vacuumed for 1 hour and soaked in water for 24 hours. Results indicated that the best response for dimensional stability was performed by mangium with 33% paraffin and jackfruit wood with 66% paraffine. In addition, moisture content of all treated samples decreased after treatment. This research also showed that the treatment had no significant effect to MOE, MOR and hardness of the wood. Key words: Dimensional stability of wood, liquid parafin, mangium, jackfruit wood References
PENDUGAAN KEKAKUAN KAYU BORNEO DENGAN METODE GELOMBANG ULTRASONIK . Syahidah; Tekat Dwi Cahyono
PERENNIAL Vol. 6 No. 1 (2010)
Publisher : Forestry Faculty of Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24259/perennial.v6i1.193

Abstract

Borneo wood is a name for various species commercial wood. The aimed of this study are measured stifness (MOE) of borneo wood using non destructive method i.e. ultrasonic wave. Fiveteen beam sample were produced from borneo wood about 8 cm thick and 12 cm width with 400 cm, 250 cm and 150 cm length. Beam with 250 cm and 150 cm length produced from beam with 400 cm length after stifness test have done using ultrasonic (dynamic test) and UTM (static test). Result showed that dynamic MOE of borneo wood for 400 cm, 250 cm and 150 cm length, are 19.10 G.Pa, 18.48 G.Pa and 15.90 G.Pa, respectively. Wood about 400 cm and 150 cm length were different significantly. Result also showed that dynamic MOE of borneo wood 30% higher than static MOE at vertical position test for beam with 400 cm length and 20% higher for horisontal position at the same testing method. Key words : Borneo wood, stifness, ultrasonic, MOE, MOR
Analisis Modulus Geser dan Pengaruhnya terhadap Kekakuan Panel Laminasi Kayu Samama (Antocephallus Macrophyllus) Tekat Dwi Cahyono; Imam Wahyudi; Trisna Priadi; Fauzi Febrianto; Syarif Ohorella
Jurnal Teknik Sipil Vol 21 No 2 (2014)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2014.21.2.3

Abstract

Abstrak. Modulus geser perlu dijadikan pertimbangan pada produkkayu, khususnya untuk desain yang memiliki rasio tinggi/panjang bentangnya besar.Penelitian ini mendesain 6 tipe panel laminasi kayu Samama (Antocephallus macrophyllus), menganalisis modulus geser dan pengaruhnya terhadap nilai kekakuan (MOEstatis) masing-masing panel laminasi. Hasilnya kemudian dibandingan dengan kekakuan hasil pengujian non destruktif (MOEd). Hasil penelitian menunjukkan bahwa modulus geser panel laminasi kayu Samama memberikan pengaruh sebesar 2 - 8% terhadap kekakuan kayu Samama, tergantung pada tipe laminasi dan panjang bentangnya. Sementara itu nilai pengujian non-destruktif memiliki nilai yang lebih besar 11 - 20% dibandingan dengan kekakuan panel laminasi kayu Samamayang telah terkoreksi oleh modulus geser. Abstract. Shear modulus need to be considered in designing wood product that has high ratio of height/length. This study designed 6 types of panel lamina made of Samama wood (Antocephallus macrophyllus). The shear modulus was measured and its effect on the stiffness (MOE static) was analyzed in comparison to those of non-destructive test (MOEd). The results showed that shear modulus affected the stiffness of the laminas by 2-8%;the value was determined by the type of lamination and the length of span. Meanwhile, non-destructive test showedthat the laminas had 11-20% of higher stiffness than those of laminas with shear modulus corrected-stiffness.
Sudut Kontak dan Keterbasahan Dinamis Kayu Samama pada Berbagai Pengerjaan Kayu Tekat Dwi Cahyono; Imam Wahyudi; Trisna Priadi; Fauzi Febrianto; Syarif Ohorella
Jurnal Teknik Sipil Vol 24 No 3 (2017)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2017.24.3.3

Abstract

AbstrakSudut kontak dan keterbasahan dinamis penting diketahui untuk menganalisis keteguhan rekat. Penelitian ini bertujuan mengetahui sudut kontak dan keterbasahan dinamis kayu samama pada berbagai pengerjaan kayu. Metode yang digunakan adalah meneteskan air destilata, perekat UF dan isosianat dengan ukuran tertentu pada permukaan kayu hasil gergaji dan hasil mesin kupas. Permukaan kayu gergajian yang ditetesi oleh cairan adalah permukaan radial, tangensial dan permukaan yang membentuk sudut 45° antara radial dan tangensial. Sementara itu permukaan finir hasil pengupasan adalah permukaan tight dan loose. Kayu gergajian maupun finir yang dianalisis pada penelitian ini, keduanya diambil dari bagian juvenil dan dewasa. Keterbasahan dinamis dianalisis menggunakan model SD. Hasil penelitian menunjukkan bahwa porositas permukaan bahan berpengaruh terhadap keterbasahan kayu samama oleh cairan. Permukaan tangensial memiliki sifat yang lebih mudah mengalami keterbasahan dibandingkan dengan permukaan radial maupun TR (permukaan antara radial dan tangensial) sementara bagian juvenil memiliki tingkat keterbasahan lebih baik dibandingkan dewasanya. Finir samama memiliki tingkat keterbasahan setara dengan permukaan TR kayu samama dimana bagian juvenil finir memiliki laju keterbasahan yang lebih baik dibandingkan dengan finir dewasa. Disamping itu, bagian loose finir lebih cepat terbasahi oleh cairan dibandingkan bagian tight.AbstractContact angle and dynamic wettability is important in determining bonding strength, therefore, this study addressed contact angle and dynamic wettability of samama wood in various woodworking. Method used in the study was by dripping distill water, UF and isocyanate adhesives in particular size on the surface of wood processed by circular saw and peeling machine. The surfaces of sawn wood which dripped by those liquids were radial, tangential, and surface which made a 45° angle between radial and tangential. Meanwhile the tested surfaces of peeled-veneer were tight and loose surfaces. Both sawn wood and veneer in this study were taken from juvenile and mature part of the samama wood. Dynamic wettability was analyzed using SD model. The results showed that porosity of the surface significantly affected the wettability of samama wood by liquid. The profile of tangential surface made it had a better wettability than radial and TR (i.e. surface between radial and tangential) surfaces. Meanwhile, juvenile part showed better wettability than the mature one. The samama veneer had equal wettability with TR surface of sawn wood in which the juvenile one showed better wettability than the mature veneer. Further, it was noticed that loose surface of the veneer was wetted faster than the tight one.
Tingkat Erosi Sub Daerah Aliran Sungai Wae Sari I: Kondisi Umum Dedy Sofyan; Sedek Karepesina; Tekat Dwi Cahyono
Jurnal Agrohut Vol 3 No 1 (2012): Jurnal Agrohut
Publisher : Fakultas Pertanian Universitas Darussalam Ambon

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (714.739 KB)

Abstract

Serangkaian penelitian dilakukan untuk melihat terjadinya erosi di wilayah Kabupaten Seram Bagian Barat. Fokus kegiatan dilakukan di Sub Daerah Aliran Sungai Wae Sari. Sub DAS ini penting bagi masyarakat Kecamatan Kairatu, khususnya wilayah yang terdekat. Pada tahap ini penelitian dilakukan dengan melakukan analisis dan menyajikan data umum Sub DAS Wae Sari. Hasil penelitian menunjukkan bahwa kerapatan drainase termasuk dalam kategori sedang. Topografi agak curam mendominasi sub DAS Wae Sari sebesar 30,41%. Dua formasi geologi ditemukan, yaitu Aluvium (Qa) dan Kompleks Taunussa (Pzta) dengan prosentase masing-masing sebesar 19,05 dan 80,95%. Curah hujan bulanan rata-rata sebesar 192,83 mm/bulan dan bulan Juni memiliki cuah hujan tertinggi, yaitu sebesar 428,92 mm/bulan. Berdasarkan penggunaan lahan, kebun campuran memiliki prosentase terbesar (lebih dari 30%) atau seluas 120,35 Ha. Hasil penelitian bermanfaat sebagai data awal kegiatan konservasi tanah dan kebijakan pengelolaan yang tepat untuk Sub DAS Wae Sari.
Efektifitas Pesan Instruksional pada Media Folder dalam Diseminasi Informasi Pertanian M Nasir Benunur; Tekat Dwi Cahyono
Jurnal Agrohut Vol 2 No 1 (2011): Jurnal Agrohut
Publisher : Fakultas Pertanian Universitas Darussalam Ambon

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (203.494 KB)

Abstract

Factor of geography and limited agricultural communication channels made the dissemination of agricultural information limited and unequally distributed. The question is whether the brief and practical form of instructional at folder and its capability in exposing message could be used as an effective information channel. This research had the objective to clarify the performance effects of message instructional of folder in increasing farmers’ knowledge and its correlation to perception indicator, and personal characteristics. The research was conducted on three experimental groups taken randomly from 60 cacao farmers. Two groups were treated with instructional folder and demonstrative method, while the third group was treated as control. Separate pre-test and pos-test conducted on the samples was used as the design. ANCOVA and Spearman correlation method were used in analyzing the data. The results indicated that the message performance of the instructional folder and demonstration method had the same effectiveness in influencing the increase in knowledge. The effect had the correlation to the perception about the instructional folder, but had no correlation to the personal characteristics and communication behavior. Therefore, the effectiveness of the instruction folder in the dissemination of agricultural information was determined by the perception of the farmers, and it was effective for use by farmers with different personal characteristics.
Co-Authors . Syahidah A.A. Ketut Agung Cahyawan W Dedy Sofyan Dedy Sofyan Farida Bahalwan Fauzi Febrianto Fitriyanti Kaliky Imam Wahyudi Indrawan, Imam Wahyudi Jumadil Thepu Juni La Djumat Kamaruddin Kamaruddin Kapitanhitu, Rusli La Djumat, Juni M Nasir Benunur Muhammad Bula Muhammad Nasir Benunur Narti Kawarnidi Noviyanti, Eka Nurhaya Yusuf Putra, Guruh Sukarno Samin Botanri Sedek Karepesina Sudiono Wali Syarif Ohorella Trisna PRIADI Wardhani, Miranti Kusuma