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All Journal Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Journal of the Indonesian Mathematical Society SEMIRATA 2015 Jurnal Sains Matematika dan Statistika Jurnal Matematika: MANTIK Jambura Journal of Mathematics Jurnal Abdidas Unri Conference Series: Community Engagement Pattimura Proceeding : Conference of Science and Technology Indonesian Journal of Advanced Social Works (DARMA)
Leli Deswita
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Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Education Energy Engineering Health Professions Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences Other

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LUAS DENGAN PARTISI SEGITIGA UNTUK FUNGSI CEKUNG Leli Deswita, Juni Lesti Nengsih, Syamsudhuha,
SEMIRATA 2015 Prosiding Bidang Matematika
Publisher : SEMIRATA 2015

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Abstract

Dalam artikel ini dibahas  teknik menentukan luas  daerah di R2 yang dibatasi sebuah kurva f dangaris dan dengan menggunakan partisi segitiga, dengan menentukan kurva utama (kurva f) serta memilih titik utama di (  dengan  pada interval , tekhnik ini diberikan oleh Affaf [6], dengan memberikan formula baru L= Namun Affaf belum menjelaskan untuk f seperti apa sehingga formula tersebut berlaku sehingga akan bertanda sama dalam selang . Oleh karena itu untuk penelitian selanjutnya  diidentifikasi apakah untuk fungsi cekung ke atas / cekung ke bawah akan memenuhi kondisi yang diinginkan, serta sifat-sifat apa saja yang muncul dengan menggunakan formula yang baru.   Kata kunci: Partisi segitiga, titik utama, kurva utama
SOLUSI PERSAMAAN MAXWELL DALAM SISTEM KOORDINAT SILINDER YANG MEMBENTUK MEDAN MAGNET Deswita, Leli
SEMIRATA 2015 Prosiding Bidang Matematika
Publisher : SEMIRATA 2015

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Abstract

Artikel ini membahas persamaan gelombang elektromagnetik yang diturunkan dari persamaan Maxwell dalam sistem koordinat silinder yang membentuk medan magnet. Sebagai contoh aplikasi diperlukan penjalaran gelombang di dalam pemandu gelombang dalam bentuk logam dengan penampang lingkaran dan dinding terbuat dari bahan konduktor. Mengingat bahwa pemandu gelombang berbentuk pipa, maka dipilih sistem koordinat silinder sehingga fungsi gelombang yang dicari berbentuk  medan magnet.   Kata Kunci: Persamaan Maxwells, Gelombang Elektromagnetik, koordinat Silinder, dan Medan magnet
KESTABILAN POPULASI MODEL LOTKA-VOLTERRA TIGA SPESIES DENGAN TITIK KESETIMBANGAN Monica, Ritania; Deswita, Leli; Pane, Rolan
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

This article discusses the stability analysis of the population in Lotka-Volterra model of the three species. The analysis was conducted on the stability of the equilibrium point and the coordinate plane through linear analysis. Furthermore, some numerical examples show that the solutions obtained using the parameter values provide an overview of the development of the three species.
SOLUSI POLINOMIAL TAYLOR DARI PERSAMAAN INTEGRAL VOLTERRA Nasution, Lisa Anna; Deswita, Leli; Lily, Endang
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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We discuss a polynomial solution of linear and nonlinear Volterra integral equations by stating their solutions in the form of a Taylor series. Furthermore, the coefficients of the Taylor series are determined by solving a system of linear equation. Then by inserting these coefficients into the Taylor series, we obtained a polynomial solution of linear and nonlinear Volterra integral equations in a simple form.
Pemodelan Matematika Perpindahan Panas Konveksi Campuran (Mixed Convection) pada Pelat Horizontal Leli Deswita
Jurnal Matematika MANTIK Vol. 3 No. 2 (2017): Mathematics and Applied Mathematics
Publisher : Mathematics Department, Faculty of Science and Technology, UIN Sunan Ampel Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (345.049 KB) | DOI: 10.15642/mantik.2017.3.2.96-100

Abstract

This study examines and analyzes mathematical model of mixed convection in horizontal plate. The heat transfer uses the model of a two dimensional nonlinear partial differential equations system. Then, this equation is derived first into the dimensionless equation form, and then it is changed into system of nonlinear ordinary differential equations form using similarity transformation. This system of nonlinear ordinary differential equations is solved by using the finite-difference scheme method, also with the mathematics program with software Matlab. The results obtained form this program is to determine skin friction coefficient , wall temperature velocity profiles and temperature profiles
Luas Dengan Partisi Segitiga Untuk Fungsi Cekung Juni Lesti Nengsih; Syamsudhuha Syamsudhuha; Leli Deswita
Jurnal Sains Matematika dan Statistika Vol 1, No 1 (2015): JSMS Januari 2015
Publisher : Universitas Islam Negeri Sultan Syarif Kasim Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24014/jsms.v1i1.1966

Abstract

NOISE TERMS PADA SOLUSI DERET DEKOMPOSISI ADOMIAN DALAM MENYELESAIKAN PERSAMAAN DIFERENSIAL PARSIAL Heni Kusnani; Leli Deswita; Zulkarnain '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

This article discusses the solution of nonhomogeneous linear partial differential equa-tions of first order and homogeneous nonlinear partial differential equations of second order using Adomian decomposition method. The obtained solution is of the form series. In the series solution of nonhomogeneous linear partial differential equations of the first order appears noise terms phenomenon, which is the same terms but with opposite sign, so that the solution obtained is a finite series.
MODIFIKASI METODE DEKOMPOSISI ADOMIAN UNTUK MENYELESAIKAN PERSAMAAN GELOMBANG NONLINEAR Widiya Fitrina Sari; Leli Deswita; Endang Lily
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 1 (2014): Wisuda Februari 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

This article discusses the modification of Adomian decomposition method to solve anonlinear wave equation. Some numerical examples are used to show the effectivenessof the method. The numerical result show that the solution obtained through themodification of Adomian decomposition method is better than the solutions obtainedusing Adomian decomposition method.
MODEL MATEMATIKA UNTUK MENGUKUR TINGKAT KEBASAHAN PADA SAAT HUJAN TURUN Cristina Anjela Tamba; Leli Deswita; Supriadi Putra
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

This article discusses the mathematical models for measuring the degree of wetness caused by rain, which is a review of the Dank Hailman and Bruce Torrents article [Mathematics Magazine, 82: 266-277 (2009)]. Mathematical models are made with three different body shapes, namely a rectangular shape, round shape, and ellipsoidal shape. From each model, the optimum speed can be determined, which minimizes the degree of wetness of the body.
KONSEP METODE ITERASI VARIASIONAL Yuliani '; Leli Deswita; Agusni '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

We discuss a basic concept of variational iteration method for solving partial differential equations. Variational iteration method, which can be used for finding iterative formula, consists of three basic concepts, namely a general Lagrange multiplier, a restricted variation and a correction functional.
Co-Authors Agusni ' Alfiryani Andhi, Rahmat Rizal Anisya Larasaty Anugerah Permata Sari Asmara Karma Asrifah Lubis Aulia Mawaddah Ayunda Putri Barzevan Limbong Beauty, Meivy Andhika Cahyani, Atik Luthfia Cristina Anjela Tamba David Seand Rafael Eka Kurniawati Endang Lily Fathia Hanin Nabila Gena Naila Antoni Gunawan, Yahya Gustimal Witri Hazirah Febrina Heni Kusnani Inez Putri Nabila Intan Kartika Sari, Intan Kartika Isnaini Putri Jesi Alexander Alim Jhon Bona Saragih Juni Lesti Nengsih Khozin Mu’tamar -, Khozin Mu’tamar Lisa Anna Nasution M. Imran Muhammad Hafiz Tanjung Neni Hermita Nora Julianti Nurul Hidayah Riski Amelia Ritania Monica Rolan Pane Sekar Puspita Ningrum Solly Aryza Sri Gemawati Supriadi Putra Syamsudhuha Syamsudhuha Widiya Fitrina Sari Yoga Hafiz Irawan Yuliani ' Yuniza ' Zakaria Avandi Zetra Hainul Putra Zulkarnain '