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Nasruddin
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Performa Sistem Autocascade dengan Menggunakan Karbondioksida sebagai Refrigeran Campuran Nasruddin; Ardi Yuliono; Darwin Rio Budi Syaka
Jurnal Rekayasa Proses Vol 5, No 1 (2011)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (525.987 KB) | DOI: 10.22146/jrekpros.1894

Abstract

Sistem refrigerasi yang saat ini digunakan sebagian besar masih menggunakan refrigeran yang mengandung zat perusak ozon atau penyebab pemanasan global. Karena itu, diperlukan alternatif refrigeran alamiah, yang salah satunya adalah CO2. Namun tingginya tekanan CO2 membatasi penggunaanya pada sistem refrigerasi konvensional. Solusi untuk mengatasi hal itu, dengan biaya investasi yang relatif rendah, adalah dengan menggunakan sistem refrigerasi autocascade. Penelitian ini mempelajari sistem refrigerasi autocascade menggunakan beberapa variasi campuran CO2 (R744) dengan R12 untuk dibandingkan dengan campuran refrigerant alternatif ramah lingkungan yaitu campuran CO2 (R744) dengan R600a. Parameter yang dianalisa antara lain (1) suhu evaporasi, (2) suhu kondensasi, (3) suhu suction, (4) suhu discharge, (5) tekanan suction, dan (5) tekanan discharge. Hasil pengujian menunjukkan bahwa penambahan komposisi CO2 sebesar 10% atau lebih dalam sistem refrigerasi autocascade dapat menaikkan tekanan kerja sistem. Oleh karena itu, penambahan komposisi CO2 tersebut harus masih di dalam batas-batas toleransi tekanan kerja kompresor yang diijinkan. Kata kunci: autocascade, refrigeran, CO2 , R12, R600a, kompresor Most refrigeration systems today use refrigerant which causes ozone depletion or global warming. Therefore, alternative natural refrigerants are highly required. One potential candidate is CO2. However, high pressure of CO2 limits its application in conventional refrigeration system. To solve this problem, a low investment cost of autocascade refrigeration system is used. This research investigated autocascade refrigeration system using a mixture of CO2 (R744) and R12, in comparison with environmentally friendly refrigerant mixture of CO2 (R744) and R600a. The parameters analyzed were (1) evaporation temperature, (2) condensation temperature, (3) suction temperature, (4) discharge temperature, (5) suction pressure, and (5) discharge pressure. The experiment results showed that an increase of CO2 concentration by 10% or more in the autocascade refrigeration system could raise system pressure. Therefore, the increase of CO2 pressure should be within the allowable limit of the working pressure of the compressor. Keywords: autocascade, refrigerant, CO2, R12, R600a, compressor
Performa Sistem Autocascade dengan Menggunakan Karbondioksida sebagai Refrigeran Campuran Nasruddin; Ardi Yuliono; Darwin Rio Budi Syaka
Jurnal Rekayasa Proses Vol 5, No 1 (2011)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.1894

Abstract

Sistem refrigerasi yang saat ini digunakan sebagian besar masih menggunakan refrigeran yang mengandung zat perusak ozon atau penyebab pemanasan global. Karena itu, diperlukan alternatif refrigeran alamiah, yang salah satunya adalah CO2. Namun tingginya tekanan CO2 membatasi penggunaanya pada sistem refrigerasi konvensional. Solusi untuk mengatasi hal itu, dengan biaya investasi yang relatif rendah, adalah dengan menggunakan sistem refrigerasi autocascade. Penelitian ini mempelajari sistem refrigerasi autocascade menggunakan beberapa variasi campuran CO2 (R744) dengan R12 untuk dibandingkan dengan campuran refrigerant alternatif ramah lingkungan yaitu campuran CO2 (R744) dengan R600a. Parameter yang dianalisa antara lain (1) suhu evaporasi, (2) suhu kondensasi, (3) suhu suction, (4) suhu discharge, (5) tekanan suction, dan (5) tekanan discharge. Hasil pengujian menunjukkan bahwa penambahan komposisi CO2 sebesar 10% atau lebih dalam sistem refrigerasi autocascade dapat menaikkan tekanan kerja sistem. Oleh karena itu, penambahan komposisi CO2 tersebut harus masih di dalam batas-batas toleransi tekanan kerja kompresor yang diijinkan. Kata kunci: autocascade, refrigeran, CO2 , R12, R600a, kompresor Most refrigeration systems today use refrigerant which causes ozone depletion or global warming. Therefore, alternative natural refrigerants are highly required. One potential candidate is CO2. However, high pressure of CO2 limits its application in conventional refrigeration system. To solve this problem, a low investment cost of autocascade refrigeration system is used. This research investigated autocascade refrigeration system using a mixture of CO2 (R744) and R12, in comparison with environmentally friendly refrigerant mixture of CO2 (R744) and R600a. The parameters analyzed were (1) evaporation temperature, (2) condensation temperature, (3) suction temperature, (4) discharge temperature, (5) suction pressure, and (5) discharge pressure. The experiment results showed that an increase of CO2 concentration by 10% or more in the autocascade refrigeration system could raise system pressure. Therefore, the increase of CO2 pressure should be within the allowable limit of the working pressure of the compressor. Keywords: autocascade, refrigerant, CO2, R12, R600a, compressor
THE EFFECT OF THE CONTEXSTUAL TEACHING AND LEARNING (CTL ) APPROACH ON STUDENT LEARNING OUTCOMES IN IPS COURSES Nasruddin; Wahyuddin
Jurnal Scientia Vol. 11 No. 01 (2022): Education, Sosial science and Planning technique, August
Publisher : Sean Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (264.617 KB) | DOI: 10.35337/scientia.Vol8.pp584-591

Abstract

The type of research in this research is experimental research. The experimental research design used in this study was One Group Pretest and Posttest, meaning that this experiment only used one class, without using the control class. As a reference, the researchers obtained the pretest scores conducted by the subject teachers before the treatment and the post-treatment test (O2 ) as a comparison. The subjects of this study were 25 students of class Vb SDN Inpres Bontokape. Contextual Teaching and Learning (CTL) is a learning approach that links the material being studied with the real life of everyday students, both in the family environment, community schools and citizens with the aim of finding the meaning of the material for their lives and learning outcomes are change . behavior that can be obtained from habits and skills in learning so as to increase student knowledge . Through the results of this study, it was found that the Contextual Teaching And Learning (CTL) Approach to Student Learning Outcomes in Social Science Subjects at SDN Inpres Bontokape was more influential than student learning outcomes taught by conventional methods in improving learning outcomes in Social Science learning for students in class Vb IPS. SDN Inpres Bontokape. Because the average score of learning outcomes for Social Science subjects (IPS) at SD Inpres Bontokape taught using the influence of the Contextual Teaching and Learning (CTL) approach is higher than those taught using conventional methods.
PROGRAM REMEDIAL MEMBACA UNTUK MENINGKATKAN LITERASI MEMBACA SISWA DI MIN 13 NAGAN RAYA Cut Nelga Isma; Rina Rahmi; Iba Elisa; Nasruddin
Alpen: Jurnal Pendidikan Dasar Vol. 6 No. 2 (2022): Juli-Desember 2022
Publisher : FKIP Universitas Wiraraja

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24929/alpen.v6i2.162

Abstract

Literasi membaca merupakan salah satu dari empat keterampilan yang harus dikuasai siswa. Sayangnya, keterampilan ini masih menjadi masalah utama dalam dunia pendidikan khususya pada tingkat sekolah dasar. Hasil observasi awal diketahui masih banyak siswa yang tidak memahami apa yang dibacanya, bahkan tidak sedikit diantara mereka yang belum bisa membaca, untuk itu sekolah mengeluarkan kebijakan untuk mengatasi permasalahan tersebut melalui program remedial membaca. Artikel ini bertujuan untuk mengkaji program remedial membaca untuk meningkatkan literasi membaca siswa dengan menggunakan jenis penelitian kualitatif deskriptif. Adapun teknik pengumpulan datanya dilakukan mellaui observasi, wawancara dan dokumentasi. Sedangkan analisis data menggunakan policy research. Hasil penelitian menunjukkan bahwa program remedial membaca dapat meningkatkan literasi membaca siswa. Program ini dilaksanakan melalui dua cara. Dimana untuk siswa kelas rendah, program remedial membaca dilaksanakan secara kelompok yang dikumpulkan dalam satu kelas dan diajarkan secara klasikal oleh beberapa guru. Sedangkan untuk kelas tinggi, program remedial membaca dilaksanakan secara individu atau perseorangan dengan menggunakan berbagai strategi dan metode. Keberhasilan program ini tentunya membutuhkan dukungan dan kerjasama dari berbagai pihak yang meliputi: guru, orang tua, dan siswa. Dengan demikian, kerjasama yang baik antar stakeholder akan menunjang keberhasilan siswa dalam memperoleh pendidikan yang berkualitas.
Increased Production Of Corn (Zea Mays, L) Varieties Lamuru, Bisma, Sukmaraga In Marginal Critical Land With The Use Of Cow Manure In North Aceh Regency Jamidi Jamidi; Nasruddin; Hafifah; Zurrahmi Wirda; Muhammad Albi Ansari Pohan
International Journal of Science and Environment (IJSE) Vol. 2 No. 3 (2022): August 2022
Publisher : CV. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (175.858 KB) | DOI: 10.51601/ijse.v2i2.20

Abstract

This study aims to determine the technique of increasing the production of corn (Zea mays, l) varieties of lamuru,bisma, sukma raga with marginal critical land with the use of cow manureby North Aceh District. This research was carried out from June to November 2021, at the West Reuleut Gampong Garden, Muara Batu District, North Aceh Regency. This study used a 3 x 2 randomized block design and replicated 3 times. The first factor is varieties with 3 levels, name-ly: Bisma, Lamuru, and Sukmaraga varieties. The second factor is cow manure with 2 levels, namely 15 tons/ha and 20 tons/ha. Parameters observed were plant height, stem diameter, number of leaves, time of flower emergence, cob length, cob weight, length without cob, weightwithout cob, and weight of 1000 seeds. The results showed that the treatment of severalvarieties showed a very significant effect on almost all of the observed variables. The use of bisma varieties showed the best growth. The use of cow manure 15 tons/ha also gives the bestgrowth on almost all variables.
Efek Penambahan Admixture terhadap Kuat Tekan Beton SCC pada Umur 7 Hari Dengan Metode Wet Curing Nasruddin; Victor Sampebulu; Pratiwi Mushar
Jurnal Lingkungan Binaan Indonesia Vol. 9 No. 1 (2020): JLBI
Publisher : Ikatan Peneliti Lingkungan Binaan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32315/jlbi.v9i1.94

Abstract

Penggunaan material beton sebagai bahan konstruksi bangunan semakin meningkat kebutuhannya. Hal ini menyebabkan perlunya inovasi dan teknologi dalam perkembangan bahan beton. Akibat semakin berkurang dan mahalnya tenaga kerja menyebabkan perlunya campuran beton yang dapat memadat sendiri sehingga tidak memerlukan tenaga kerja yang banyak untuk mengerjakannya dibarengi dengan kualitas beton yang tinggi. Pada tahun 1988, beton kinerja tinggi ditemukan dengan sebutan beton SCC (Self Compacting Concrete). Beton ini memanfaatkan pengaturan ukuran agregat, porsi agregat dan admixture superplastiziser untuk mendapatkan kekentalan khusus memungkinkan beton dapat mengalir sendiri tanpa bantuan alat pemadat. Jenis penelitian ini adalah eksperimental yang dilakukan di laboratorium. Tujuan penelitian adalah mendapatkan nilai kuat tekan beton SCC dengan bahan tambah superplastiziser yang diuji melalui destructive test dengan menggunakan Universal Testing Machine (UTM). Variabel penelitian: variasi umur 7 hari, metode perawatan. Hasil penelitian menunjukkan bahwa kuat tekan beton SCC didapatkan nilai lebih tinggi dari beton normal.
Kuat Tekan Beton antara Metode Destructive Test dan Non-Destructive Test pada Beton Ringan Berbahan Fly Ash atau Slag Victor Sampebulu; Nasruddin; Pratiwi Mushar
Jurnal Lingkungan Binaan Indonesia Vol. 7 No. 2 (2018): JLBI
Publisher : Ikatan Peneliti Lingkungan Binaan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32315/jlbi.7.2.107

Abstract

Metode pengujian kuat tekan beton yang dianggap tingkat keandalannya paling tinggi adalah pengujian merusak (destructive test) dengan menggunakan alat compressive testing machine. Pengujian ini membutuhkan biaya yang cukup tinggi dan memerlukan waktu pengerjaan yang lebih lama. Namun terkadang pengujian untuk mengetahui kuat tekan beton tidak selalu bisa dilakukan di laboratorium dengan alat compressive testing machine, tapi harus dilakukan langsung di lapangan. Untuk kondisi seperti ini dan dalam rangka pengawasan mutu beton dilapangan dibutuhkan alat pengujian untuk mengukur atau mengetahui kuat tekan beton keras dengan cepat dan praktis serta tidak merusak. Pengujian ini dikenal dengan istilah uji tidak merusak (non-destructive test). Tujuan pembahasan ini adalah untuk mengetahui perbandingan nilai kuat tekan beton antara beton normal dengan beton ringan (fly ash) dengan variabel yang sama (variasi umur dan perawatan) dan dengan cara destructive test dan non-destructive test. Metode penelitian yang dipergunakan adalah eksperimental, menganalisis data hasil uji dengan metode komparatif serta secara kuantitatif. Hasil dari dari pembahasan adalah didapatkannya “nilai kuat tekan beton ringan” untuk Compressive Testing Mechine (UTM) dimana nilai hasil pengukurannya bisa dibandingkan dengan nilai kuat tekan beton normal yang diuji oleh alat yang sama.
COLLABORATIVE GOVERNANCE DALAM INOVASI DAERAH: (Studi Kasus : Pembangunan Taman Median Jalur Hijau Km.55 – Simpang Kualo Pangkalan Kerinci) Nasruddin
JURNAL RISET INOVASI DAERAH (RIVDA) Vol 1 No 1 (2023): Juni 2023
Publisher : Badan Penelitian dan Pengembangan Daerah Kab. Pelalawan

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The construction of the Km. 55 Green Lane Median Park- Simpang Kualo Pangkalan Kerinci, is a program/ activity that is motivated by the lack of green open space (RTH) and the inability of the regional budget (APBD) while development must be always taken placed. So that, the Regional Government of Pelalawan Regency needs to enforce development efforts that are innovative, creative and adaptive. For this reason, collaboration with the company as the main actor in financing is required. The purpose of this study is to identify and analyze how the pattern of collaborative governance implementation in regional innovation in the construction of the Km. 55 Green Lane Median Park- Simpang Kualo Pangkalan Kerinci. This research uses qualitative analysis using descriptive research. The result of this research is collaborative action in regional innovation in the construction of the Km. 55 Green Lane Median Park- Simpang Kualo Pangkalan Kerinci which is carried out by 5 actors based on the Penta Helix (PH) concept, namely the Pelalawan Regency Government, third parties (companies), academics, media center and society. Analysis of the collaboration process is carried out in 4 (four) stages, namely: 1) initial conditions, 2) Institutionalization, 3) facilitative leadership, and 4) collaboration processes. At this stage of the collaboration process is carried out by face-to-face dialogue, field observations, construction and transfer of assets. The result of this research will contribute to improve development financing and the quality of the environment and society.
Analisis Perkembangan Berpikir Kritis Siswa dalam Pembelajaran Matematika Perspektif Studi Longitudinal Suwarma, Dina Mayadiana; Hersiyati Palayukan; Nasruddin; Sitti Rahmayani; Syarifuddin
Indo-MathEdu Intellectuals Journal Vol. 5 No. 3 (2024): Indo-MathEdu Intellectuals Journal
Publisher : Lembaga Intelektual Muda (LIM) Maluku

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54373/imeij.v5i3.1361

Abstract

This research explores the development of students' critical thinking in mathematics learning through a longitudinal study approach. With a focus on problem solving, creative thinking, and conceptual understanding, this study aims to understand how students develop critical thinking skills over time. A longitudinal research method was used with 100 students from two secondary schools in Medan city as participants. Results showed significant improvements in students' critical thinking scores from the beginning to the end of the semester, with teacher training interventions and differences between schools making significant contributions. The implication of this study is the importance of innovative learning approaches and support for teachers in improving students' critical thinking skills in the context of mathematics learning
Pengaruh Talent Management dan Knowledge Management Terhadap Employee Retention pada Millennials Workforce yang di Moderasi oleh Employee Engagement Nasruddin; Putri, Shara Amelia
Jurnal EMT KITA Vol 7 No 4 (2023): OCTOBER 2023
Publisher : Lembaga Otonom Lembaga Informasi dan Riset Indonesia (KITA INFO dan RISET) - Lembaga KITA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35870/emt.v7i4.1559

Abstract

Human Resources (HR) is a strategic element of an organization to achieve its mission, where HR plays a role as a reference point in determining policies that align with the organization's goals. The aim of this research is to determine whether talent management and knowledge management have a partial effect on employee retention in the millennial workforce and to examine whether employee engagement can moderate the relationship between talent management and knowledge management on employee retention in the millennial workforce. The sampling technique employed the Lemeshow method, resulting in a sample of 96 individuals. The study focused on a dynamic, boundaryless, digitally connected workforce that eschews conventional boundaries, namely the millennial workforce. The data used consisted of both primary and secondary data, collected through Likert scale questionnaires. Data analysis was conducted using the Multiple Regression Analysis approach. The research findings indicate that talent management does not have an impact on employee retention, while knowledge management does have an impact on employee retention. Employee engagement is found to moderate the relationship between talent management, knowledge management, and employee retention.
Co-Authors Ade Yuni Sahruni Adi Ahmad Andi Nadira Mahm Andika Saputra Andini Sudarmin Andri Estining Sejati Ansar CS Ardi Yuliono Arifuddin, Muhammad chairuddin Cut Nelga Isma Darwin Rio Budi Syaka Della Hendra Deni Trianda Pitri Desty Fatmawati Fatmawati Hafifah Halfiani, Waode Hersiyati Palayukan Iba Elisa Ilham Tahier Jahring Jamidi Jamidi Junalia Muhammad Lutfiana Tarida Maimun Marpaung, Beny OY Mayadiana Suwarma, Dina Muh. Syaiful Syam Muhammad Albi Ansari Pohan Muhammad Sadzali Muhammad Yassir Nanda Nur Ihsan Nurfaida Tasni Ovan, Ovan Pratiwi Mushar Putri, Shara Amelia Rendy Prakasa Rina Rahmi Riyan Maulana Rudianto Sitti Rahmayani Sufyan Suhufan, Mohammad Abdi Suriadi Syarifuddin Tarmizi Victor Sampebulu Wahyuddin Zurrahmi Wirda