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All Journal Jurnal Ilmu Pertanian Indonesia Bulletin of Scientific Contribution : Geology Journal of the Medical Sciences (Berkala Ilmu Kedokteran) Jurnal Pendidikan Teknik Mesin PERENNIAL
. Wahyudi
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Environmental Science Immunology & microbiology Mechanical Engineering Neuroscience

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PENGEMBANGAN ALAT PERAGA PEMBELAJARAN SISTEM WIPER PADA MATA PELAJARAN PEMELIHARAAN KELISTRIKAN KENDARAAN RINGAN Syafiqi, Audi Norma; Wahyudi, .
Jurnal Pendidikan Teknik Mesin Vol 18, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Negeri Semarang

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Abstract

Tujuan penelitian ini adalah untuk mengetahui media pembelajaran pada materi sistem wiper dalam bentuk alat peraga valid dan efektif pada mata pelajaran pemeliharaan kelistrikan kendaraan ringan di SMKN 1 Semarang. Metode penelitian menggunakan metode Research and Development dengan model pengembangan ADDIE yang terdiri dari tahap Analysis, Design, Develop, Implement, dan Evaluate. Hasil penelitian media peraga sistem wiper yang dikembangkan sangat valid dengan hasil analisis penilaian dari validator ahli media dengan jumlah skor total 117 berada pada kriteria sangat valid dan penilaian ahli materi dengan jumlah skor total 165 berada pada kriteria sangat valid. Media peraga sistem wiper juga efektif untuk diterapkan sebagai media peraga dalam pembelajaran dengan rata-rata hasil belajar siswa kelas eksperimen lebih tinggi daripada hasil belajar siswa kelas kontrol yaitu 86,57 banding 79,5. Hal ini terbukti dari hasil uji t bahwa nilai thitung = 4,89 > ttabel = 2,68 maka bisa dikatakan Ha diterima.
Tebang pilih tanam jalur : pemodelan pertumbuhan tanaman meranti pada jalur tanam . Wahyudi; Andry Indrawan; Irdika Mansur; Prijanto Pamoengkas
Jurnal Ilmu Pertanian Indonesia Vol. 15 No. 1 (2010): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Abstract

Selective Cutting and Line Planting (SCLP) silvicultural system can be applied in the logged over forest and low potential forest to improve their productivity . The research was aimed to create the growth modelling of Shorea plantations in the line planting system. The research was conducted at research plots of SCLP in logged over forest of PT Gunung Meranti, Central Kalimantan Province. The research plots were divided into three plots of Shorea Jeprosula plantation that planted in 1994 as plot 1, year 1999 as plot 2 and year 2008 in which consisted of 200 samples of trees, respectively. Data of Shorea Jeprosula growth were evaluated by Stella 9.0.2 and SPSS 13, and predicted using table of volume, exponential and polynomial equations. The research result showed that exponential equation was y= 1,0269.e0,012x(R2= 96,02%) and estimated cutting cycle at 37 year old, average polynomial equation was y=0,0297x2+ 0,8208x + 0,3728 (R2= 86,89%) and estimated cutting cycle at 30 year old and group polynomial equations (R2> 95%) estimated cutting cycle at 32 years old. The best model was group polynomial equations that represented exponential equation and average polynomial equation in the yield of volume.
ANALISIS PERTUMBUHAN DAN HASIL TANAMAN JABON (Anthocephallus cadamba) . Wahyudi
PERENNIAL Vol. 8 No. 1 (2012)
Publisher : Forestry Faculty of Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24259/perennial.v8i1.210

Abstract

Anthocephallus cadamba was a native species and one of some commercial trees which had a good prospect to develop on the low production forest. This research was aimed to analyze growth and yield of A. cadamba plantation, including the living trees percentage, productivity, economic cutting cycle, and its profit. Parameter of data analysis used trees diameter, high and volume, mean annual increment, polynomial equation modelling and financial analysis i.e. net present value (NPV), and benefit cost ratio (BCR). The research had been conducted at research plots of A. cadamba in sub District of Mandau Talawang, Central Kalimantan Province since 1998 to 2010. Soil type in the site was ultisol former shifting cultivation and scrubs. The result of this research showed that living trees precentage at 12 years old was 57.7 %. Mean annual increment and its density were 19.05 m3 ha-1 and 641 tree ha-1 respectively. Equation modelling of jabon plantation was y = 4.7814 + 3.6028x - 0.185x2 (R2= 63.34 %). In the bank rate of 9 % year-1, the economic cutting cycle of this plantation was 13 years with net present value was IDR 72,79 million per ha. If the bank rate of 6 % and 12 % per year, then net present value at the 13 years were IDR 108.52 and IDR 48.56 million ha-1 respectively. The A. cadamba was suitable to timber estate and to increase the productivity of former shifting cultivation, scrub, and low potential forest areas. Key words: growth and yield, mean annual increment, Anthocephallus cadamba, economic cutting cycle
The relationship between soldier’s body readiness level and the anxiousness tendency of students in the flyer academy of the Indonesian Air Force Army Adisutjipto Airbase Yogyakarta . Wahyudi; Cecep Sugeng Kristanto; Sumarni DW
Journal of the Medical Sciences (Berkala Ilmu Kedokteran) Vol 45, No 03 (2013)
Publisher : Journal of the Medical Sciences (Berkala Ilmu Kedokteran)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (355.349 KB) | DOI: 10.19106/JMedScie004503201305

Abstract

Training the Indonesian Air Force flyers takes a lot of time and fund. The cramped trainingschedule, demand of discipline and achievement, and intense stress from the fear of dying fromplane accidents give the flyer students an even bigger stress that could potentially lead toanxiousness. In the selection of flyer candidates in the field, the most important aspect to benoticed is the body readiness of the candidates, whereas the mental health is frequently leftunchecked. There was a case in a training session where a flyer student experienced a badmental and academic achievement that, after being traced, resulted from poor mental healthtest, although the military body readiness test was good. It left the country with a loss fromhaving to discharge the student. The aim of this study was to identify the relationship betweenthe military body readiness level and the anxiousness tendency of a flyer apprentice. This was anobservational study with cross-sectional design. The research subjects was the flyer students ofthe Indonesian National Air Force Army in Adisutjipto Airbase Yogyakarta. The sample was takenfrom all of the subjects which fulfilled the inclusion and exclusion criteria. The measurement ofthe anxiousness used the TMAS (Taylor Manifest Anxiety Scale), whereas the military bodyreadiness value was taken directly in the field test. Moreover, psychological stress was alsomeasured using Instrument of Psychosocial Stressor Assessment (IPSP). The results were analyzedusing Chi-Square test and multiple regression analysis. It was found that there was no significantlyrelationship between the military body readiness value and the anxiousness tendency of theflyer student in the flyer academy of the Indonesian National Air Force Army in AdisutjiptoAirbase Yogyakarta (p>0,05). The psychological stress factor has a role in creating the anxiousnesstendency of the flyer students.
Karakteristik Kimia Organik Pada Akifer Bebas di Beberapa Lokasi Pemanfaatan Lahan Daerah Jatinangor Dan sekitarnya wahyudi, .; Suganda, Bombom Rahmat; Hadian, Sapari Dwi; Sendjaja, Yoga Andriana; Irawan, Budi
Bulletin of Scientific Contribution Vol 17, No 3 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (780.997 KB) | DOI: 10.24198/bsc.v17i3.23120

Abstract

Daerah Jatinangor secara umum dimanfaatkan untuk kegiatan pertanian, permukiman dan industri. Peningkatan pemanfaatan lahan permukiman berpotensi mengakibatkan penurunan kualitas airtanah. Objek penelitian ini untuk mengetahui perbedaan sifat kimia organik airtanah pada akifer dangkal di beberapa jenis pemanfaatan lahan. Penentuan konsentrasi sifat kimia organik airtanah dilakukan dengan pengujian laboratoium KMnO4, BOD dan COD sebagai parameter yang menjadi indikator bahan organik di perairan. Hasil penelitian menunjukan bahwa terdapat perbedaan konsentrasi paramater kimia organik airtanah pada jenis pemanfaatan lahan permukiman dan industri terutama pada musim hujan.
Co-Authors Andry Indrawan Bombom Rahmat Suganda, Bombom Rahmat Budi Irawan Cecep Sugeng Kristanto Irdika Mansur Prijanto Pamoengkas Sapari Dwi Hadian, Sapari Dwi Sumarni DW Syafiqi, Audi Norma Yoga Andriana Sendjaja, Yoga Andriana