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All Journal Journal of Natural Sciences and Mathematics Research Phenomenon : Jurnal Pendidikan MIPA Journal of Physics: Theories and Applications INDONESIAN JOURNAL OF APPLIED PHYSICS Jurnal Pendidikan Fisika dan Teknologi Jurnal Panjar: Pengabdian Bidang Pembelajaran PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Physics Communication Varia Humanika
Teguh Darsono
Physics Department, Faculty Of Mathematics And Natural Sciences, Universitas Negeri Semarang
Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Education Electrical & Electronics Engineering Energy Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Analysis of the Results of the Reduction of Cyanide Acid Content in Hevea brasiliensis Seeds Diah Ayu Kusuma Putri; Sulhadi Sulhadi; Teguh Darsono
Journal of Natural Sciences and Mathematics Research Vol 5, No 1 (2019): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (234.722 KB) | DOI: 10.21580/jnsmr.2019.5.1.11026

Abstract

Rubber seeds (Hevea brasiliensis) are part of rubber plants that have not been utilized optimaly. The content contained in rubber seeds is sufficient, including fat content of 68.53 g/100 g, proteins 17.41 g/100 g, and carbohydratees 6.99 g/100 g. However, the obstacle faced is the presence of toxic compounds found in rubber seeds namely cyanide acid (HCN) which is very dangerous if it enters the body. The purpose of this study is to find out the right treatment to reduce the content of cyanide acid so that the rubber seeds can be utilized. The research method uses experimental comparative. The variation used in the reduction process is to soak the rubber seeds respectively for 12, 24, and 36 hours by replacing the immersion water once every 2 hours, then boil the rubber seeds into 2 liters of water for 2 hours by replacing the boiled water for 1 hour. The results showed that the greatest decrease in cyanide acid content occurred during soaking for 36 hours with boiling for 2 hours.©2019 JNSMR UIN Walisongo. All rights reserved.
Production of Brikueda (Briquettes from Teak Sawdusts and Durian Rind/Durio zibethinus) as Renewable Fuels Wihdatus Syarifah; Sulhadi Sulhadi; Teguh Darsono
Journal of Natural Sciences and Mathematics Research Vol 5, No 1 (2019): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (231.436 KB) | DOI: 10.21580/jnsmr.2019.5.1.11025

Abstract

Jepara is a carving city. The result of carving produces sawdust waste which is usually used to be sold and burned. In addition, durian fruit is available that has a distinctive taste and made an icon of one village in Jepara. The fruit is the belle of the whole community to be eaten by meat and made food. But the skin has the traits and characters that are difficult to decompose. Then the two wastes will be combined with tapioca flour into briquettes as an alternative fuel. This research take four stage: combustion, filtering, printing, and drying. Obtained two treatment, the first treatment is using ratio wood sawdust and durian rind; 50 gr: 50 gr; 25 gr: 50 gr; 50 gr: 25 gr. The results shown it does not ignite up and very hard. The second treatment is using same ratio but added 25 gram starch, the results shown it ignite. This is due to the starch content is used, it ignite the longest with a concentration ratio of 50 gr: 50 gr because its combination increases the calories value. In durian rind there are 3786 cal/g and teak wood consists mainly of cellulose (40-50%), hemicellulose (20-30%), lignin (20-30%), and the calories value of sawdust briquettes is 4714-5519 kcal/kg.©2019 JNSMR UIN Walisongo. All rights reserved.
RANCANG BANGUN ALAT PENDETEKSI SUHU DAN KELEMBABAN BERBASIS NODEMCU PADA BUDIDAYA JAMUR TIRAM Ahmad Minanur Rohim; Sulhadi Sulhadi; Teguh Darsono
Phenomenon : Jurnal Pendidikan MIPA Vol 9, No 2 (2019): Jurnal Pendidikan MIPA
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/phen.2019.9.2.4636

Abstract

Penelitian ini bertujuan menghasilkan alat pendeteksi suhu dan kelembaban terintegrasi dengan internet berbasis NodeMCU melalui WEB sebagai media informasi pada budidaya jamur tiram. Alat pendeteksi suhu dan kelembaban telah dikembangkan dengan mengkombinasikan sensor DHT11, NodeMCU, dan sketch program Arduino IDE sebagai pengirim data ke WEB dan relay sebagai saklar pompa. Hasil eksperimen telah memperlihatkan data pada WEB serta relay dapat menyalakan pompa saat alat mendeteksi kelembaban 80% dapat menyirami rak jamur tiram sedangkan saat alat mendeteksi kelembaban 80% relay mematikan pompa dan hasil panen tanpa perlakuan rata-rata perhari 1kg sedangkan dengan perlakuan rata-rata perhari 2kg. Demikian dapat disimpulkan alat pendeteksi suhu dan kelembaban mampu memberikan informasi dan membantu menaikkan hasil panen petani jamur tiram.
Implementasi LKS Dengan Pendekatan STEM (Science, Technology, Engineering, And Mathematics) Untuk Meningkatkan Kemampuan Berpikir Kritis Siswa Diyah Ayu Budi Lestari; Budi Astuti; Teguh Darsono
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 4 No 2 (2018): Juli-Desember 2018
Publisher : Department of Physics Education, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (648.121 KB) | DOI: 10.29303/jpft.v4i2.809

Abstract

The purpose of this study is to overcome the increased of critical thinking’ students after they used worksheet with STEM approach. This research method is experiment method that consist of preparing, implementation, and data processing. Increasing of critical thinking can be measured by pretest-posttest problems. The result of data normalization show that data have normal distributed so next test is n-gain test. Result of the n-gain test pretest-posttest scores around 0.5 (medium level categorized). The highest improvement is 0.9 at evaluation aspect and lowest increase is 0.3 at interpretation aspect.
Geo-Electric Resistivity Method of Dipole-Dipole Configuration For Cavities Model 2D in Karst Area of Temurejo Village Gubug Sub-district Central Java District Yuanna Rhesdeantia; Teguh Darsono; Khumaedi Khumaedi
Journal of Physics: Theories and Applications Vol 1, No 2 (2017): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1676.084 KB) | DOI: 10.20961/jphystheor-appl.v1i2.19318

Abstract

The purpose of this research is to mapping cavities in karst area in Temurejo Village, Karangrayung, Grobogan using geoelectric resistivity method and dipole-dipole configuration. Measurement consist of six lines using Multichannel S-Fields geoelectric instrument. Apparent resistivity data processing use two software, Res2DInv ver. 3.56.22 and Voxler 4.0. The result is lithology of the research location can be interpret consist of sand-silt, carbonate-silt rock, carbonate-sand rock, and carbonate rock with resistivity range 15,3-4919 Ωm. There are resistivity value anomaly in line of 1,2,3,4,5, and 6 on the carbonate rocks layer, the value is more than 4949 Ωm which can interpret as a cavity. On the first line, cavities are at depths of 20 m and 12 m, on second line are at depths of 17 m and 12 m, on third line is at depth of 19 m. Cavity continuously at depth of 18 m on fourth, fifth and sixth lines. This cavities at the depth >23 m beneath eath surface.
Effect of Post-Annealing Treatment on the Morphological and Optical Properties of ZnO Thin Film Fabricated by Spraying Deposition Method Teguh Darsono; Muqoyyanah Muqoyyanah; Sulhadi Sulhadi; Siti Wahyuni; Putut Marwoto; Sugianto Sugianto
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 11, No 1 (2021): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v11i1.46927

Abstract

This work investigated the effect of post-annealing treatment on the fabrication of zinc oxide (ZnO) thin film by spraying deposition method. Based on SEM analysis, the annealed ZnO thin film at 400˚C presented better uniformity as compared to the non-annealed film. Further measurement by UV-Vis revealed that the lowest optical band gap energy (Eg) (3.22 eV) was achieved by 400˚C sample. These results confirmed that post-annealing treatment enhanced the optical and morphological properties of the fabricated ZnO thin film.
PENGARUH BENTUK DAUN LONTAR TERHADAP INTENSITAS BUNYI ALAT MUSIK SASANDO Afrianus Gelu; Sulhadi Sulhadi; Teguh Darsono; Kristianus Liwa
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 6 (2017): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2017
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (266.832 KB) | DOI: 10.21009/03.SNF2017.02.MPS.12

Abstract

Sasando is one of traditional music instrument from Rote Ndao Regency, East Nusa Tenggara. Sasando classified as musical instruments chordophone because played by way of plucked. One of the compilers of the construction of the Sasando is a leaf of the lontar (siwalan). This study aims to determine the influence of changes in the shape of leaves lontar (siwalan) horizontally to the intensity of the sound produced. The horizontal width of the lontar leaves was varied by 30 cm, 35 cm, 40 cm, 45 cm, 50 cm, and 55 cm. The intensity of the sound that is produced is measured using a Sound Level Meter (SLM). Based on the research results obtained show that there is change the value of the sound intensity if the diameter of the horizontal palm leaf changed its size. The value of the sound intensity the average Sasando change varies from 9,68 x 10-7 W/m2 up to a 2,85 x 10-5 W/m2. The value of the intensity of the sound of most high is at a diameter of 40 cm while the value of the sound intensity that most low located on a diameter of 30 cm. Keywords: Sasando, lontar, sound intensity
PEMANFAATAN SERAT PELEPAH PISANG SEBAGAI BAHAN TALI TAHAN AIR Hasri Arlin Wuriyudani; Sulhadi Sulhadi; Teguh Darsono
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 6 (2017): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2017
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (719.695 KB) | DOI: 10.21009/03.SNF2017.02.MPS.15

Abstract

Waterproof rope with diameter 5 mm and length 30 cm has been produced from banana stalk by spinning process. Spinning process is began by separating inner and outer banana fiber after drying process. The inner fiber is soaked by chitosan 2% with variation of dyeing for 1 hour to 5 hours. Chitosan 2% is obtained by dissolving acetic acid 1% with chitosan powder. Banana fiber is dried and spinned to be a rope. The quality of waterproof rope is indicated by density test, water absorption test, and breaking strength test. The highest density 0,78 is obtained from 5 hours of dyeing. The highest water absorption 87,39% is obtained without dyeing. And the breaking strength 290,00 N is obtained from two hours of dyeing. Keywords: Banana fiber, waterproof rope, chitosan
PEMANFAATAN ABU KULIT BUAH KAPUK RANDU SEBAGAI ALTERNATIF BAHAN PENGEMBANG KUE Nenik Yuniarti; Sulhadi Sulhadi; Teguh Darsono
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 6 (2017): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2017
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (321.21 KB) | DOI: 10.21009/03.SNF2017.02.MPS.16

Abstract

Kapok tree (C. pentandra) is a plant that is commonly found in Indonesia. The skin of kapok fruit containing sodium substances can be utilized as raw material for making baking soda. The purpose of this study is to determine the increase in the volume of cakes owned by food developers. This research method by soaking the ashes of the skin in the air at least 12 hours. Soaked ashes of filtered ashes and evaporated water until temperature of 890 C until the result of baking soda solids. Baking soda testing was done on steamed brown dough. First, the brown dough is given 5 grams, volume is 722.5 cm3. Second, given 10 grams of baking soda, the volumes 1011.5 cm3. As much as 15 grams, the volume 1156 cm3. The provision of baking powder as a comparison is done by the same treatment. The first, given 5 grams of developers, resulting volume 722.5 cm3. Second, as much as 10 grams, the volume 1011.5 cm3. Third, as much as 15 grams, the volume 1156 cm3. From the above test, the addition of baked soda to brownie cake contains the same volume as the volume produced on the addition of baking powder. Keywords: Fruit leather ashes, baking soda
FABRIKASI TINTA SPIDOL WHITEBOARD BERBAHAN DASAR PIGMEN ORGANIK DARI ENDAPAN MINUMAN KOPI Amalia Puspita Rengganis; Sulhadi Sulhadi; Teguh Darsono; Dhamar Putra Fajar
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 6 (2017): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2017
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (650.941 KB) | DOI: 10.21009/03.SNF2017.02.MPS.17

Abstract

The ground of coffee drink does not have a high use value. An attempt has been made to utilize the coffee drink as an organic pigment for the whiteboard marker ink. Making organic pigment was done by reducing the particle size of coffee beverage using ball milling and screen mesh. The process of making the ink is by mixing the ingredients of ink such as Arabic gum, aquades, alcohol, and PEG on organic pigments. The process of making the ink is done by variation of arabic gum binder composition from 1 gram up to 3.5 grams. Based on the test result, the addition of arabic gum mass will increase the viscosity and level of ink adhesion. While in the transmittance test, the addition of arabic gum mass will decrease the intensity value of light transmitted by ink Keywords: Ink, Organic Pigment, Ground of Coffee.
Co-Authors Aditya Bagus Wicaksana Afrianus Gelu Ahmad Minanur Rohim Ahmadun Ahmadun Amalia Puspita Rengganis Ani Rusilowati Aninditya Dwi Perwitasari Anisa Aulia Marantika Budi Astuti Cintia Agtasia Putri Dhamar Putra Fajar Diah Ayu Kusuma Putri Diyah Ayu Budi Lestari Hasri Arlin Wuriyudani Haydnn Caesha Maulana Indrawan Nur Cahyono Isna Lukluil Millah Khumaedi Khumaedi Kristianus Liwa Langlang Handayani Mahardika Prasetya Aji Mufid Eska Nurcahya Muqoyyanah Muqoyyanah Nenik Yuniarti Putut Marwoto R Indriyanto Riagan Bagus P S Sulhadi Sarwi Sarwi Slamet Haryono Sriatun Sriatun Sugianto - Suhardi Effendy Sulhadi Sulhadi Sulhadi Sulhadi Sulhadi Sulhadi Sulhadi Sulhadi Sulhadi Sulhadi Sunarno Susi Agung Purwaningtyas Susi Agung Purwaningtyas Tina Anggraini Wihdatus Syarifah Yuanna Rhesdeantia