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STUDI AWAL GRADING BUAH SAWIT DENGAN BANTUAN INJEKSI TEGANGAN LISTRIK SEARAH Saputra, Andri; Candra, Wahyu; Soerbakti, Yan; Syahputra, Romi Fadli; Defrianto, Defrianto; Saktioto, Saktioto
Komunikasi Fisika Indonesia Vol 16, No 2 (2019)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (148.462 KB) | DOI: 10.31258/jkfi.16.2.103-106

Abstract

Maturity progress of palm fruit is greatly depending on the availability of nutrients and environments. Determining maturity level of palm fruit is important to evaluate the quality of palm oil fruits. The younger or too mature fruits will produce poor quality of crude palm oil (CPO). An appropriate devices are needed that can measure the level of fruit maturity so that uniformity of maturity grade can be carried out to obtain high quality CPO. This research provides a preliminary study of voltage change on the surface of oil palm seeds which subjected by electric potential. The low directional voltage (DC) injection treatment, ~ 10V, was applied to investigate the impact of applied voltage on palm oil seeds with three different levels of maturity, i.e. immature (young), ripe and over ripe . The results shown that oil palm fruit quite quickly responds to injection of DC applied voltage with different responding voltage. This responding voltage tends to increase with increasing maturity levels, but decreases for over ripe fruit which has falling down and starting to dry out. 
SIMULASI POLA ALIRAN FLUIDA DALAM DAERAH DENGAN BATAS TIDAK TERATUR MENGGUNAKAN METODE ELEMEN Defrianto, Defrianto; Safitri, Dwi Putri Cahya
Komunikasi Fisika Indonesia Vol 16, No 1 (2019)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (337.059 KB) | DOI: 10.31258/jkfi.16.1.70-74

Abstract

Research of ideal fluid flow on irregular domain by variation mesh has been done. Laplace equation was used to model velocity potential and the gradient was used to velocity. Boundary condition for inlet was chosen to be 15 , while for outlet was 30  and Neumann boundary condition on lateral side. The developed model shows that uniform flow was happened on straight channel and free vortex on the curved one. The analytical and computational calculation has similar results, that is 23.7787  and 23.7792  The percentage of the difference is 2.8  wich is very small, therefore this method is accurate enough to model pattern of ideal fluid flow on irregular domain.
PENGARUH KEBIASAAN BELAJAR DAN PERHATIAN ORANG TUA TERHADAP HASIL BELAJAR SISWA EKONOMI KELAS X DI SMA KARTIKA 1 – 5 PADANG. Defrianto, Defrianto; Afriza, Rina; Eprillison, Vivina
Pendidikan Ekonomi Vol 1, No 1 (2014): Jurnal Wisuda Ke 48 Mahasiswa Prodi Pendidikan Ekonomi
Publisher : Pendidikan Ekonomi

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Abstract

ABSTRACT  This research was conducted at the Padang 1-5 Kartika High School Study Habits Influence And Attention Parents Against Student Results X Class Economy In high school Kartika 1-5 Padang . The purpose of this study is to obtain empirical evidence about the Influence of Study Habits And Attention Parents Against Student Results X Class Economy In high school Kartika 1-5 Padang . The method used in this research is descriptive and associative . This research is a symptom , events and to determine the relationship between two variables or more , where the population sampled were used as much as 174 students out of a population of 308 students . Data habit learning ( X1 ) and parental concern ( X2 ) is obtained from the results of the questionnaire or questionnaires while economics student learning outcomes data ( Y ) is obtained from the documentation of the value of mid semester. Analysis of the data used in this study is a descriptive analysis and inductive analysis which consists of a normality test, multikolinielitas , heterosidasitas test , autocorrelation test , multiple regression analysis , determination ( R2 ) and test the hypothesis . The results of this study indicate that : 1 . Habit learning positive and significant effect on student learning outcomes economy class X SMA kartika 1-5 field , 2 . Attention parents and significant positive effect on learning outcomes of students high school economics class X kartika 1-5 padang , 3 . habit learning and parental concern and a significant positive effect jointly to the results of the economic study of high school students kartika 1-5 padang . Based on these results , it is suggested that students , parents , teachers and school authorities to pay more attention to another study habits and attention of parents in the learning process in an effort to further optimize student learning outcomes economy class X SMA kartika 1-5 padang.
PENGARUH KETIDAKTERATURAN DOMAIN PADA NORMAL MODE DAN FREKWENSI NATURAL PADA GETARAN MEMBRAN Defrianto, Defrianto; Tambunan, Walfred; Ginting, Maksi
Komunikasi Fisika Indonesia Vol 14, No 1 (2017)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.14.1.945-950

Abstract

Telah dilakukan penelitian untuk menentukan frakwensi natural dan normal mode getaran membranedengan luas 48 m2 berbentuk teratur 4 sisi, tidak teratur 8 dan 10 sisi. Frekwensi fundamental padanormal mode pertama untuk membrane 4, 8 dan 10 sisi berturut-turut yaitu 1.7129, 1.7503 dan 1.7973Hz. Frekwensi natural untuk mode yang sama menunjukkan semakin tidak teratur membrane akanmemberikan frekwensi natural yang semakin tinggi. Normal mode untuk setiap mode pada membrane4, 8 dan 10 sisi memberikan bentuk yang hampir sama.
STRATEGI PENANGGULANGAN KEBAKARAN PADA LAHAN GAMBUT DENGAN MENGGUNAKAN PENDEKATAN EKO-TEKNOLOGI PADA MASYARAKAT PETANI DI DESA RIMBO PANJANG KECAMATAN TAMBANG KABUPATEN KAMPAR PROVINSI RIAU Saktioto, Saktioto; Defrianto, Defrianto; Syech, Riad; Syahril, Syahril; Risanto, Joko
Komunikasi Fisika Indonesia Vol 15, No 2 (2018)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.15.2.156-159

Abstract

People who care about the environment always reject the use of peat land for large-scale plantation areas, because this can cause an increase in carbon gas and can even cause damage to peat land in Rimbo Panjang Village, Tambang District, Kampar Regency. that there was an event of a land fire which almost hit the residential area in Rimbo Panjang village, Kec. Kampar District Mine on February 24, 2015. That there are complaints from the community in Rimbo Panjang village, Kec. Kampar Regency Mine about environmental conditions or smog. The implementation of Eco-Technology can protect the environment of peatlands to maintain sustainability and avoid fire from peatlands and regulate groundwater management on peatlands.
Pengaruh Sosialisasi, Sanksi, dan Kepercayaan terhadap Kepatuhan Wajib Pajak dalam Membayar Pajak Pph Pasal 21 Ariani, Meiliyah; Defrianto, Defrianto; Zulhawati, Zulhawati
JRAP (Jurnal Riset Akuntansi dan Perpajakan) Vol 3, No 2 (2016): Desember 2016
Publisher : Magister Akuntansi Universitas Pancasila

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Abstract

A B S T R A C TThis study aims to determine the effect of Socialization Taxes, Penalties Tax, and Trust Officers Against Taxes on Individual Taxpayer Compliance in Tax Paying Income Tax Article 21 (Empirical Study KPP Pratama Jakarta Kebayoran Lama). Data were obtained from the questionnaire (primary). analysis of the data model used in this research is multiple regression analysis. Sampling was done by accidental sampling method (Convenience Sampling). Based on the results of data analysis using SPSS 23 shows that the t-test results prove the hypothesis that socialization tax and penalties tax have no effect, while the effect on the confidence of taxpayer compliance in paying taxes Income Tax Article 21 on KPP Pratama Jakarta Kebayoran Lama. F-test results prove the hypothesis that socialization tax, penalties tax, and the trust officers against taxes has a positive influence on tax compliance in paying taxes Income Tax Article 21 on KPP Pratama Jakarta Kebayoran Lama.A B S T R A KPenelitian ini bertujuan untuk mengetahui Pengaruh Sosialisasi Pajak, Sanksi Pajak, dan Kepercayaan terhadap Aparat Pajak dalam Kepatuhan Individu Wajib Pajak Membayar Pajak PPh pasal 21 (Studi Empiris KPP Pratama Jakarta Kebayoran Lama). Data penelitian diperoleh dari kuesioner (primer). analisis model data yang digunakan dalam penelitian ini adalah analisis regresi berganda. Pengambilan sampel dilakukan dengan metode accidental sampling (Convenience Sampling). Berdasarkan hasil analisis data dengan menggunakan SPSS 23 menunjukkan bahwa hasil hipotesis t-test membuktikan bahwa sosialisasi pajak dan sanksi pajak tidak berpengaruh, sedangkan kepercayaan terhadap aparat pajak berpengaruh pada kepatuhan dari wajib pajak dalam membayar pajak PPh pasal 21 di KPP Pratama Jakarta Kebayoran Lama. Hasil hipotesis f-test membuktikan bahwa sosialisasi pajak, sanksi pajak, dan kepercayaan terhadap aparat pajak memiliki pengaruh positif pada kepatuhan wajib pajak dalam membayar pajak PPh pasal 21 di KPP Pratama Jakarta Kebayoran Lama.
EFEK TEGANGAN SEARAH PADA ALIRAN IONIK DAN GEOMETRI PELEPAH DAN DAUN KELAPA SAWIT Saktioto, Toto; Defrianto, Defrianto; Suhardi, Suhardi; Roslim, Dewi Indriyani; Awitdrus, Awitdrus
Jurnal Keteknikan Pertanian Vol. 6 No. 1 (2018): JURNAL KETEKNIKAN PERTANIAN
Publisher : PERTETA

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Abstract

AbstractProductivity of palm tree grown are generally measured in months periods, but in a shorter time scale is particularly less measured by the plant maintenance of palm tree. Consideration of the general productivity in time is how to produce good fruit fertilizer (chemical aspect), healthy plants, fast growing and evolving (agricultural aspect) and genetic type of palm that grows (biological aspect). However, the growth and production on the physical aspect is still less attention. Through physical treatment, the growth of palm tree can be optimized, as it has been proven in advanced countries on the plant Aloe Vera, Avocado and Pine trees. This paper proposes a treatment of direct current voltage to palm tree that can accelerate the flow of ions to grow and develop nutrients with the increment of geometry and sturcture of leaf and midrib. The palm tree samples are aged 1 to 5 years corresponding to the provision of various current voltage. Identification of samples before and after treatment by electricity determined is based on the geometry of leaves and midrib and ions effect. This identification can support the productivity of palm trees.AbstrakProduktivitas kelapa sawit pada umumnya diukur dalam periode bulanan, tetapi dalam skala waktu yang lebih singkat masih kurang terukur dengan pemeliharaan tanaman sawit. Pertimbangan umum produktivitas tersebut adalah bagaimana pupuk menghasilkan buah yang baik (aspek kimia), tanaman sehat, cepat tumbuh dan berkembang (aspek pertanian), dan jenis genetik sawit yang tumbuh (aspek biologi). Namun, pertumbuhan dan produksi pada aspek fisik masih kurang diperhatikan. Melalui perlakuan fisis, pertumbuhan kelapa sawit dapat dioptimalkan, seperti yang telah teruji di negara-negara maju pada tanaman Aloe Vera, Avocado dan Pohon Pinus. Perlakuan pemberian tegangan listrik searah terhadapkelapa sawit dapat memepercepat aliran ion-ion untuk tumbuh dan berkembang dengan penambahan unsur hara dan struktur geometri pada daun dan pelepah. Sampel yang digunakan adalah pohon sawitberusia 1 hingga 5 tahun dengan pemberian tegangan bervariasi. Identifikasi sampel sebelum dan setelah diberi perlakuan listrik ditentukan berdasarkan geometri daun dan pelepah dan efek ion-ion. Identifikasi ini dapat mendukung produktivitas tanaman sawit.
EFEKTIVITAS SOCIAL MEDIA MARKETING E-COMMERCE DALAM MENINGKATKAN BRAND IMAGE PERUSAHAAN (SURVEI PADA PELANGGAN TOKOPEDIA) Defrianto, Defrianto; Loisa, Riris
Prologia Vol 3, No 2 (2019): Prologia
Publisher : Fakultas Ilmu Komunikasi Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/pr.v3i2.6398

Abstract

The research was done to determine the impact the of social media marketing will have on brand image Tokopedia. The research uses marketing communication theory, social media marketing, and brand image. Tokopedia is an e-commerce that offers a variety of products for its users starting with bill payment, electronics, beauty, automotive, and daily necessities. The approach used for this study is a quantitative approach with a survey method. The population in this study is the user of Tokopedia and the number of samples taken as much as 218 individuals and are using nonprobability sampling techniques with the purposive sampling approach. The data collected in this study is from a questionnaire. Based on the results of the research, it has been obtained that partial, there is an impact that social media marketing has had on the brand image Tokopedia. On the dimension of social media marketing, communication indicators are the highest indicator, and on the brand image dimension, brand benefit and competence indicators are the highest indicator. The relation that happened is only 28,3%. The rest of the 71,7% are affected by other factors outside the social media marketing activity.Penelitian ini dilakukan untuk mengetahui pengaruh social media marketing terhadap brand image Tokopedia. Penelitian ini menggunakan teori komunikasi pemasaran, social media marketing, dan brand image. Tokopedia merupakan e-commerce yang menawarkan berbagai macam produk-produk untuk penggunanya dimulai dari pembayaran tagihan, elektronik, kecantikan, otomotif, dan kebutuhan sehari-hari. Pendekatan yang digunakan untuk penelitian ini adalah pendekatan kuantitatif dengan metode survey. Populasi dalam penelitian ini adalah pengguna Tokopedia dan jumlah sampel yang diambil sebanyak 218 orang dan menggunakan teknik nonprobability sampling dengan pendekatan purposive sampling. Data yang dikumpulkan dalam penelitian ini dengan menggunakan kuisioner. Berdasarkan hasil penelitian, maka diperoleh hasil bahwa secara parsial, ada pengaruh social media marketing terhadap brand image Tokopedia. Pada dimensi social media marketing, indikator komunikasi merupakan indikator yang tertinggi, dan pada dimensi brand image, indikator brand benefit and competence merupakan indikator tertinggi. Hubungan yang terjadi hanya sebesar 28,3%. Sisanya 71,7% dipengaruhi oleh faktor lain diluar kegiatan social media marketing.