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All Journal Lingkungan dan Kesehatan Kerja Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Journal of Bioprocess Chemical and Environmental Engineering Science Jurnal Ekonomi, Bisnis dan Manajemen Al-Ihsan: Jurnal Bisnis dan Ekonomi Syariah
Irma Damayanti
Unknown Affiliation
Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Public Health

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PERBEDAAN TINGKAT KONSENTRASI SEBELUM DAN SESUDAH ADANYA BISING AKIBAT AKTIFITAS PERLINTASAN KERETA API PADA SISWA DI SEKOLAH DASAR NEGERI 067240 KECAMATAN MEDAN TEMBUNG KOTA MEDAN TAHUN 2015 irma damayanti; indra chahaya; taufik ashar
Lingkungan dan Kesehatan Kerja Vol 4, No 3 (2015): Lingkungan & Kesehatan Kerja
Publisher : Lingkungan dan Kesehatan Kerja

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Abstract

ABSTRACTDiscomfort can occur in the environment of school, one of them is thenoise. Noise that occurs when subjects ongoing impact on the learning process,which is one of the disruption of the concentration of students. The research wasconducted at the State Primary School 067240 Medan Tembung District whichaims to find out the difference in the level of concentration towards the studentsbefore and after the noise due to railway crossings.This method of this research is pre-experimental design by using onegroup and pre-test post-test. The sample of this research is also using purposivesampling technique which consists of 58 students. The level of noise wasmeasured by using a Sound Level Meter and level of concentration of studentswas measured using a Stroop Test. Data analysis is using non-parametricstatistical tests (Wilcoxon tes t) and Parametric Test (paired t-test) at the 95%significance level.The results showed that in general the average noise level in theclassroom before and while the train passed the railway crossing exceeds thequality standards that have been established in the amount of 55 dB. Other resultsalso showed that the results of interference score of students before the railroadcrossing with a mean of 13,59 and after the railway crossing at 17,40. Thisindicates that the concentration of students has decreased when compared withpretest posttest. Based on the test results of wilcoxon test is known, there are thedifferences in the level of concentration towards the students before and after thenoise due to railway crossing (p. = 0,001).Based on the results of this research are expected to the school in order toreduce the noise while is coming from the rail traffic. Such as the installation ofblind or curtain on the window class, the use of firm window on the outside walltowards the class which is passing of the train tracks, and the use of noisedampening vegetation.Keywords: The level of the noise, Concentration of the students, Stroop Test,Sound Level Meter
Prarancangan Pabrik Etilen Glikol Dari Etilen Oksida Dengan Proses Dow Meteor Irma Damayanti; Sunarno Sunarno
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Ethylene glycol is a hygroscopic liquid with low volatility. Ethylene glycol is colorless, odorless, has a low viscosity. Ethylene glycol is used as a polyester resin for fibers, a film-making agent, an antifreeze and coolant agent, a heat exchange agent, a waterbased formula, and an unsaturated polyester. The purpose of establishing an ethylene glycol factory is expected to be able to support efforts to save the country's foreign exchange through import substitution of ethylene glycol, and increase employment. Ethylene glycol factory with a capacity of 200,000 tons / year in Batam, Riau Islands. The ethylene glycol production process is carried out through the Dow METEOR process which consists of 4 stages, namely the standard discussion stage, the ethylene glycol formation stage, the ethylene glycol concentration stage, and the product separation stage. The main design is the CSTR reactor, which is used to react ethylene oxide with water to form ethylene glycol with the by-products of diethylene glycol and triethylene glycol. Based on the results of the economic feasibility analysis of the factory, the ethylene glycol plant is feasible to establish with a Payback Period (PBB) obtained of 2 years, an IRR of 22.738%, a Percent Return on Investment (ROI) is 30.59%, and a Break Event Point (BEP) is obtained by 60%. Keywords: Ethylene glycol, dow meteor, cstr reactor
Kultivasi Mikroalga Chlorella sp. Secara Fed-Batch Menggunakan Limbah Cair Tahu Untuk Produksi Lipid Sri Rezeki Muria; Fikri Miftahul Shiddiq; Irma Damayanti; Indra Purnama
Journal of Bioprocess, Chemical and Environmental Engineering Science Vol 4 No 1 (2023): Journal of Bioprocess, Chemical, and Environmental Engineering
Publisher : Jurusan Teknik Kimia, Fakultas Teknik, UNRI

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Abstract

Microalga is single cell organism that can live by photosynthesize resulting biomass and other secondary product such as protein, carbohydrate, and lipid by utilizing nutrients in wastewater. This study aims to get the data about the effect of additions of tofu liquid waste to the growth and increase of lipid content in the microalga that cultivated in tofu liquid waste media. Microalga were cultivated by variations in tofu liquid waste adding. The variations are 0,45 liter in every day, 0,9 liter in every two days, and 1,35 liter in every three days. Microalga growth were measured by an object glass, the amount of cell density in every square field calculated using tomacytometer with hand counter where observed under optical microscope. Total lipid content were gained by employ Bligh-dyer methode. The results of this study show the highest specific grow rate of Chlorella sp is 0,08692/day accounted from tofu liquid waste addition in every three days. The highest lipid content is 40,88 % which gained from tofu liquid waste addition in every day. Under unfavourable condition microalga will accumulate more lipid so that increase it lipid content. The highest chemical oxygen demand (COD) removal is 575 mg/mL.
Analisis Mutu Pelayanan PT Kereta Api Indonesia Melalui Kepuasan Pengguna Layanan Pada Stasiun Transit Kereta Rel Listrik (KRL) Rizki Kurnia Rohman; Devi Puspita Sari; Bugi Alifya; Irma Damayanti
Jurnal Ekonomi, Bisnis dan Manajemen Vol. 3 No. 2 (2024): Juni : Jurnal Ekonomi, Bisnis dan Manajemen
Publisher : FEB Universitas Maritim Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/ebismen.v3i2.2147

Abstract

Dalam membantu mobilitas masyarakat besar, transportasi umum yang memadai menjadi salah satu langkah tepat untuk memfasilitasinya. Penelitian ini memiliki tujuan untuk pelayanan mengetahui bersama PT. Kereta Api Indonesia melalui kepuasan pengguna Kereta Rel Listrik (KRL) di stasiun transit. Penelitian ini menggunakan metode kuantitatif dengan metode pengumpulan data melalui kuisioner secara personal untuk mendapatkan respon para pengguna terhadap pelayanan pada tasiun transit. Kuisioner ini berisi pertanyaan seputar kualitas pelayanan yang disediakan di stasiun transit. hasil penelitian yang didapat dari 63 orang responden rata-rata memberikan nilai cukup baik pada fasilitas yang disediakan yang diberikan penyedia layanan, dengan nilai sebesar 7,4 poin untuk total pelayanan pada stasiun transit. Dengan diadakannya penelitian ini, diharapkan mutu pelayanan yang disediakan pada transportasi umum semakin meningkat, sehingga akan memberikan kepuasan pada lebih banyak pengguna transportasi.
Pengaruh Pemahaman Ekonomi Syariah Dan Literasi Keuangan Syariah Terhadap Minat Mahasiswa MBS Menggunakan Produk Bank Syariah Aqilah Hafizhah, Fitri Dara Asmika; Irma Damayanti; Miftahul’ilmi; Aqilah Hafizhah; Mawar Marisa; Gadis Aginta
Al-Ihsan: Jurnal Bisnis dan Ekonomi Syariah Vol. 2 No. 2 (2024): Al-Ihsan : Jurnal Bisnis dan Ekonomi Syariah (Desember)
Publisher : Yayasan Rahmat Putra Kurnia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65256/jbes.v2i2.22

Abstract

Penelitian ini bertujuan untuk mengetahui pemahaman ekonomi syariah terhadap minat mahasiswa Program Studi Manajemen Bisnis Syariah (MBS) Universitas Muhammadiyah Sumatera Utara (UMSU) menggunakan produk Bank Syariah. Dengan menggunakan pendekatan kuantitatif dan metode sampling jenuh, sebanyak 37 responden dari populasi 46 mahasiswa kelas A1 Pagi Semester 6 dipilih sebagai sampel. Hasil penelitian menunjukkan bahwa pembiayaan syariah BSI memberikan dampak positif terhadap pemahaman mahasiswa mengenai prinsip keuangan Islam, meningkatkan kenyamanan dalam penggunaan layanan perbankan syariah, serta mendukung kelancaran perkuliahan dan pengelolaan keuangan mereka. Selain itu, mahasiswa menunjukkan preferensi yang tinggi terhadap layanan BSI dibanding bank konvensional serta kecenderungan untuk merekomendasikan BSI kepada pihak lain. Penelitian ini menyimpulkan bahwa pembiayaan syariah memiliki kontribusi signifikan terhadap kesejahteraan dan literasi keuangan mahasiswa dalam konteks ekonomi Islam. This study aims to examine the understanding of Islamic economics in relation to the interest of students in the Islamic Business Management (MBS) Study Program at Universitas Muhammadiyah Sumatera Utara (UMSU). Using a quantitative approach and a saturated sampling method, a total of 37 respondents from a population of 46 students in Class A1 Morning, 6th Semester, were selected as the sample. The results of the study indicate that BSI’s Islamic financing has a positive impact on students’ understanding of Islamic financial principles, enhances their comfort in using Islamic banking services, and supports the smooth running of their studies and financial management. Furthermore, students showed a strong preference for BSI services over conventional banks and a tendency to recommend BSI to others. This research concludes that Islamic financing significantly contributes to students’ well-being and financial literacy within the context of Islamic economics.
Co-Authors Aqilah Hafizhah Aqilah Hafizhah, Fitri Dara Asmika Bugi Alifya Devi Puspita Sari Fikri Miftahul Shiddiq Gadis Aginta Indra Chahaya Indra Purnama Mawar Marisa Miftahul’ilmi Rizki Kurnia Rohman Sentot Joko Raharjo Sri Rezeki Muria Sunarno Sunarno Taufik Ashar Yan Ramona