Agung Cahyono
Physics Department, Faculty of Sciences and Mathematics, Diponegoro University

Published : 6 Documents
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Estimasi Arah Strike menggunakan Metode Resistivitas Konfigurasi Persegi Cahyono, Agung; Yulianto, Gatot
BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The sounding square array resistivity method had been used to estimate strike orientation in a sub surface anomaly model. The advantage of square array are more sensitif in an anisotropic medium such as strike than inline array. Strike is an important factor to placed an array configuration in resistivity method. The array commonly lay down paralel or perpendicular with a strike depend on anomaly structure. The mapping square array was used to detect the model anomaly.The sounding square array were measured by rotating array with azimuth ,,, and . The sounding square array had an electrode spacing 1 m, 1,4 m, 2 m and 2,8 m. Azimuthal apparent resistivity was  obtained by calculation and then was plotted into Rossete diagram. The estimation of strike orientation was determined perpendicularly from maximum azimuthal apparent resistivity. The mapping square array used 10 m array spacing with 1 m electrode spacing. The Wenner array used 5 m with 0,5 m electrode spacing.Strike orientation was estimated on N 90 E. This estimation was based on result each electrode spacing on the sounding square array. The existing model anomaly were detected on 5 m until 7 m on mapping square array. The result of Wenner array modeling showed that anomaly model was detected on 2,5 m until 3,5 m on N 40 W. This result showed that the sounding square array can be applied to determine strike orientation which usually exist on geological structure Keywords: square array resistivity, strike,azimuth
PENGARUH PENERAPAN PEMBELAJARAN KOOPERATIF TIPE JIGSAW MATA PELAJARAN EKONOMI DI SMA MUHAMMADIYAH 2 PONTIANAK Cahyono, Agung; ., Junaidi H. Matsum; ., Parijo
Jurnal Pendidikan dan Pembelajaran Vol 3, No 3 (2014): Maret 2014
Publisher : Jurnal Pendidikan dan Pembelajaran

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Abstrak : Pengaruh Penerapan Model Pembelajaran Kooperatif Tipe Jigsaw terhadap Hasil Belajar Siswa Kelas XI pada Mata Pelajaran Ekonomi Di SMA Muhammadiyah 2 Pontianak. Bentuk penelitian yang digunakan ialah bentuk penelitian studi hubungan (interrelationship studies).  Variabel yang digunakan dalam penelitian ini terdiri dari (1) variabel bebas: model pembelajaran kooperatif tipe jigsaw, (2) variabel terikat : hasil belajar siswa. Populasi penelitian ini adalah siswa kelas XI SMA Muhammadiyah 2 Pontianak berjumlah 99 orang. Data yang diperoleh dianalisis dengan menggunakan analisis statistik, persamaan regresi. Berdasarkan hasil dari perhitungan menggunakan rumus persamaan regresi yang dilakukan, menunjukkan bahwa hasil belajar siswa meningkat secara signifikan (Y’ = 28,76 + 0,405 (X). Kata Kunci ; Model Pembelajaran Kooperatif Tipe Jigsaw   Abstract : The Effect of Jigsaw Application model of cooperative learning toward Class XI Student Results of Economic Lesson of SMA Muhammadiyah 2 Pontianak. The form of this research is studying association (interrelationship studies). The variables used in this study consist (1) the independent variables: jigsaw cooperative learning models, (2) dependent variables: student learning outcomes. The population was a class XI student of SMA Muhammadiyah 2 Pontianak that 99 people. Data were analyzed using statistical analysis, regression equation. Was on the results of calculations using the regression equation, showed that the learning outcomes of students increased significantly (Y =28.76+0.405 (X). Keyword ; Jigsaw Cooperative Learning Model
EFEKTIVITAS PEMBELAJARAN SOCRATES KONTEKSTUAL DALAM MENGEMBANGKAN KEMAMPUAN BERPIKIR KRITIS MATEMATIS SISWA Cahyono, Agung; Yunarti, Tina; Widyastuti, Widyastuti
Jurnal Pendidikan Matematika Unila Vol 3, No 6 (2015): JURNAL PENDIDIKAN MATEMATIKA UNIVERSITAS LAMPUNG
Publisher : Jurnal Pendidikan Matematika Unila

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Abstract

This quasi experimental research aimed to know the effectiveness of socrates contextual learning in developing student’s mathematical critical thinking ability. The design of this research was one-group pretest-posttest. The population of this research was all students of grade seven of SMPN 19 Bandarlampung in academic year of 2014/2015. The sample of this reseacrh was students of VIIB class that was chosen by purposive sampling technique. The data of this research were obtained by test of mathematical critical thinking ability. The analysis data of this research used pair sample t-test and proportion test. Based on the results and discussion, it was concluded that socrates contextual learning was not effective in developing student’s mathematical critical thinking ability.Penelitian eksperimen semu ini bertujuan untuk mengetahui efektivitas pembelajaran socrates kontekstual dalam mengembangkan kemampuan berpikir kritis matematis siswa. Desain penelitian ini adalah one-group pretest-posttest. Populasi penelitian adalah seluruh siswa kelas VII SMPN 19 Bandar­lampung tahun pelajaran 2014/2015. Sampel penelitian adalah siswa kelas VIIB yang diambil dengan teknik purposive sampling. Data penelitian diperoleh dari tes kemampuan berpikir kritis matematis. Teknik analisis data dalam penelitian ini menggunakan uji t observasi berpasangan dan uji proporsi. Berdasarkan hasil dan pembahasan, diperoleh kesimpulan bahwa pembelajaran socrates kontekstual tidak efektif dalam mengembangkan kemampuan berpikir kritis matematis siswa.Kata kunci: efektivitas, berpikir kritis matematis, socrates kontekstual
The Effect of BaCO3 Compound Changes on the Formation of Magnetic Material BaFe12O19 Priyono, Priyono; Cahyono, Agung; Marhaendrajaya, Indras; Subagio, Agus; Gunawan, Vincensius
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 4 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

BaFe12O19 is a permanent magnetic material which has superior properties to be excellent until the late of twentieth century. Some of the obstacles in the synthesis of the material using a stoichiometric composition is a difficulty to obtain a single phase and the second phase is always found. This research attempted to make modifications on the initial non-stoichiometric composition by varying the fraction of Ba/Fe through BaCO3 and Fe2O3 compound through solid state reaction mechanism. This solid state reaction was initiated by mixing various fractions of BaCO3 and Fe2O3 powder composition and compacted to produce a homogeneous mixture using a planetary milling. After drying and molding, it was obtained a homogeneous mixture like a cylinder with a diameter of 2:54 cm and a thickness of 0.5 cm. The BaFe12O19 phase was obtained by heating the sample at a temperature of 1200 ° C for 4 hours. To determine changes in the fraction of Ba/Fe before and after sintering, the samples were tested by X-Ray Fluorescence (XRF), while the structure and crystallinity were tested by X-ray diffraction (XRD) and Scanning Electron Microscope (SEM). The results showed that during the heating process, the reduction of barium fractions exceeded 5% from of their initial weight, while changes in the fraction of Fe was not significant. The results of structure and crystallinity measurement showed that the addition a substantial amount of barium carbonate can lead to the decrease of crystallinity from 35.271 nm to 11.265 nm.
Penggunaan Lindi Hitam Pada Proses Pretreatment Tandan Kosong Kelapa Sawit (Elaeis Guineensis) Cahyono, Agung; Nugroho, Wahyunanto Agung; Kadarisman, Darwin; Muryanto, .
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Publisher : Universitas Brawijaya

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Abstract

Untuk mengurangi biaya produksi, larutan alkali bekas (lindi hitam, LH) yang diperoleh dari pretreatment tandan kosong kelapa sawit (TKKS) skala pilot plant pada kondisi optimal (NaOH 2,5 M; 150oC; 4 bar; 30 menit) dimanfaatkan sebagai pelarut pada pretreatment TKKS berikutnya. Penelitian ini bertujuan untuk melakukan pretreatment TKKS berbasis alkaline explosion pretreatment dengan perlakuan penelitian meliputi rasio pelarut LH : NaOH 2,5 M (100% LH, 50% LH: 50% NaOH dan 30% LH: 70% NaOH) dan waktu pretreatment (30 menit, 45 menit dan 60 menit). Perbandingan massa TKKS dan volume pelarut adalah 1:5 (500 gram TKKS dan 2500 mL pelarut). Berdasarkan hasil penelitian, TKKS sebelum pretreatment mengandung 328,0 mg/g selulosa, 137,4 mg/g hemiselulosa, 301,6 mg/g lignin dan 22,3 mg/g abu. Perlakuan optimal didapatkan pada perlakuan 30% LH: 70% NaOH dan waktu pretreatment 30 menit  dengan kadar selulosa sebesar 261,31 mg/g dan kadar hemiselulosa serta lignin masing-masing sebesar 44,74 mg/g dan 55,54 mg/g. Kata kunci : Bioetanol, Delignifikasi, Lignoselulosa, Tandan Kosong Kelapa Sawitnocellulose, Empty Fruit Bunches
HUBUNGAN KARAKTERISTIK DAN TINGKAT PENGETAHUAN PERAWAT TERHADAP PENGELOLAAN KESELAMATAN PASIEN DI RUMAH SAKIT Cahyono, Agung
Jurnal Ilmiah Widya Vol 4 No 3 (2018)
Publisher : Jurnal Ilmiah Widya

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Abstract

Abstrak:       Tenaga perawat merupakan tenaga profesional yang berperan penting dalam fungsi di rumah sakit. Setiap tindakan medis menyimpan potensi resiko, banyaknya jenis obat, jenis pemeriksaan dan prosedur, serta jumlah pasien dan staf Rumah Sakit yang cukup besar terutama untuk tenaga perawat. Tujuan penelitian ini adalah untuk mengetahui (1) hubungan karakteristik perawat dengan tingkat pengetahuan keselamatan pasien (2) praktek keselamatan pasien dalam asuhan keperawatan di rumah sakit. Metode penelitian menggunakan desain survey deskriptif potong lintang untuk melihat distribusi dan frekuensi 2 variabel yang sejenis. Desain survey deskriptif dipilih untuk melihat distribusi dan frekuensi dari karakteristik perawat, tingkat pengetahuan tentang keselamatan pasien dan praktek keselamatan pasien dalam asuhan keperawatan di rumah sakit X kota Bekasi. Hasil penelitian menyatakan bahwa: (1) ada hubungan antara tingkat pengetahuan perawat dan praktek keselamatan pasien, diketahui pula bahwa semakin tinggi tingkat pengetahuan perawat tentang keselamatan pasien maka praktek keselamatan pasien dalam asuhan keperawatan semakin baik adalah benar, (2) Hasil analisis hubungan antara tingkat pengetahuan dan praktek keselamatan pasien memiliki hubungan positif. Kata kunci: pengetahuan perawat, keselamatan pasien. Abstract:       Power nurses are professionals who play an important role in the functioning of the hospital. Every medical procedure holds the potential risks, many types of drugs, types of examinations and procedures, as well as the number of patients and hospital staff were quite large, especially for power perawat. This study was to determine (1) the relationship characteristics of nurses with patient safety knowledge level (2 ) patient safety practices in nursing care at the hospital. The research method uses descriptive cross-sectional survey design to see the distribution and frequency of 2 similar variables. Descriptive survey design was chosen to look at the distribution and frequency of nurse characteristics, knowledge level of patient safety and patient safety practices in nursing care in hospital X Bekasi. The survey results revealed that (1) there is a correlation between the level of knowledge of nurses and patient safety practices, it is also known that the higher the level of knowledge of nurses about patient safety, the patient safety practices in nursing care, the better is true. (2) The results of the analysis of the relationship between the level of patient safety knowledge and practices have a positive relationship. Key words: knowledge nurses, patient safety