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All Journal METANA JDM (Jurnal Dinamika Manajemen) Prosiding Seminar Nasional Teknoka DHARMA EKONOMI Jurnal Pengelolaan Laboratorium Pendidikan Metalurgi Makara Journal of Technology
Sri Harjanto
Departemen Metalurgi dan Material, Fakultas Teknik, Universitas Indonesia, Depok 16424, Indonesia
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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PENGARUH PROFITABILITAS, LIKUIDITAS, KEPEMILIKAN SAHAM PUBLIK DAN UMUR LISTING TERHADAP VOLUNTARY DISCLOSURE PADA PERUSAHAAN MANUFAKTUR DI INDONESIA Aulya, Duroriyatul; -, Sutono; Harjanto, Sri
Jurnal Dinamika Manajemen (Journal of Management Dynamics) Proceeding Madic 2015
Publisher : Department of Management, Faculty of Economics, Semarang State University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jdm.v0i0.4795

Abstract

ANALISIS GOOD CORPORATE GOVERNANCE DAN SIZE TERHADAP CORPORATE SOCIAL RESPONSIBILITY YANG BERDAMPAK PADA NILAI PERUSAHAAN DENGAN PROFITABILITAS SEBAGAI VARIABEL MODERATING (Studi Empiris Pada Perusahaan Yang Terdaftar di Bursa Efek Indonesia) Sulistiyowati, Arini; Harjanto, Sri
DHARMA EKONOMI Vol 23, No 43 (2016)
Publisher : LPPM STIE DHARMAPUTRA SEMARANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (324.981 KB)

Abstract

ABSTRACTThe study has the objective to analyze the Effects of good corporate governance (GCG) and Size of the Company's, corporate social responsibility (CSR) that impact on the Corporate Values and Profitabilityas moderating variable. Collecting data in this research using secondary data of companies listed on the Indonesia Stock Exchange. Sample data in this study of 30 companies that were taken by the purposive method, the method of observation in 2012 -2014. The data analysis method used multiple regression. Hypothesis testing results show that the Good Corporate Governance (GCG) significant positive effect on Corporate Social Responsibility (CSR), Size of the Company'ssignificant positive effect on CorporateSocial Responsibility (CSR), Good Corporate Governance (GCG) significant positive effect on Corporate Values, Corporate Social Responsibility (CSR) significant positive effect on the Corporate Values and Size of the Company'ssignificant effect on the Corporate Values. While Profitabilitydoes not moderate the effect of Corporate Social Responsibility (CSR) on Company ValuesKeywords: Good Corporate Governance, Company Size, Corporate Social Responsibility, Corporate Value and Profitability ABSTRAKPenelitian bertujuan untuk menganalisis Pengaruh Good Corporate Governance (GCG) dan Size Perusahaan terhadap Corporate Social Responsibility (CSR) yang berdampak pada Nilai Perusahaan dengan Profitabilitas sebagai variabel moderating. Data dalam penelitian ini menggunakan data sekunder perusahaan yang terdaftar di Bursa Efek. Sampel data dalam penelitian ini sebanyak 30 perusahaan yang diambil dengan dengan metode purposif, dengan metode amatan tahun 2012 – 2014. Sedangkan metode analisa data yang digunakan regresi berganda. Hasil pengujian hipotesis menunjukkan bahwa GCG berpengaruh positif signifikan terhadap CSR, Size berpengaruh positif signifian terhadap CSR, GCG berpengaruh positif signifikan terhadap Nilai Perusahaan, CSR berpengaruh positif signifikan terhadap Nilai Perusahaan dan Size berpengaruh signifikan terhadap Nilai Perusahaan. Sedangkan Profitabilitas tidak memoderasi pengaruh CSR terhadap Nilai Perusahan.Kata Kunci : Good Corporate Governance, Size Perusahaan, Corporate Social Responsibility, Nilai Perusahaan dan Profitabilitas
Peran Laminar Air Flow Cabinet Dalam Uji Mikroorganisme Bagi Mahasiswa Tugas Akhir Di Laboratorium Biokimia Harjanto, Sri; Raharjo, R
Jurnal Pengelolaan Laboratorium Pendidikan Vol. 1, No. 1, Januari 2019
Publisher : Jurnal Pengelolaan Laboratorium Pendidikan

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Abstract

Work safety and safety in the laboratory environment is needed. Based on the method of classification of the number of appliances usage. In this case from the observation / survey that the number of users of Laminar air flow in biochemical laboratories for 1 year (2017) this shows a very significant number, especially in certain months such as October - November reached the number 27, 31 users, the overall number of users enough many. This means showing that the instrument is needed for its existence.Also from the type of activities undertaken by students of Final Project so far by using these instruments can be served well means the tool is able to help solve the problems of students who are completing the research. Keywords: Microorganism, Laminar Air Flow, Safety
STUDI PERBANDINGAN EFEK FOTOKATALISIS Fe2O3-TiO2 HASIL EKSTRAKSI ILMENIT BANGKA DAN P-25 DEGUSSA UNTUK APLIKASI PENGOLAHAN LIMBAH CAIR TPA CILOWONG[The Photocatalytic Effect of P-25 Degussa and Fe2O3-TiO2 Derived from Bangka- Indonesia Ilmenite Extraction for Waste Water Treatment of Leachate on the Landfill Cilowong] Lalasari, Latifa Hanum; Yuwono, Akhmad Herman; Firdiyono, Firdiyono; Andriyah, Lia; N, Elfi; Harjanto, Sri; Suharno, Bambang
Metalurgi Vol 27, No 3 (2012): Metalurgi Vol.27 No.3 Desember 2012
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (643.211 KB) | DOI: 10.14203/metalurgi.v27i3.235

Abstract

STUDI PERBANDINGAN EFEK FOTOKATALISIS Fe2O3-TiO2 HASIL EKSTRAKSI ILMENITBANGKA DAN P-25 DEGUSSA UNTUK APLIKASI PENGOLAHAN LIMBAH CAIR TPACILOWONG. Telah dilakukan penelitian penurunan kadar BOD5, COD, dan TDS dari lindi sampah tempatpembuangan akhir (TPA) Cilowong dengan menggunakan katalis Fe2O3-TiO2 dari hasil proses ekstraksi ilmenitBangka Indonesia dan TiO2 P-25 Degussa (komersial). Proses dilakukan dalam reaktor fotokatalitik berukuran30 x 15 x 20 cm dengan radiasi sinar UV 50 watt selama 90 menit pada temperatur kamar dan setiap 15 menitdiambil sampel untuk dilakukan analisa BOD5, COD, dan TDS. Variabel percobaan yang digunakan adalah rasiovolume (v/v) lindi/H2O sebesar 1/4; 1/8; 1/12; 1/16 dengan jumlah katalis yang digunakan masing-masingsebanyak 1 gram. Hasil penelitian pada rasio volume (v/v) lindi/H2O sebesar 1/16 menunjukkan penurunanBOD5, COD, TDS masing-masing sebesar 45; 90,43; 100 % untuk katalis Fe2O3-TiO2 dan sebesar 80,6; 75; 100% untuk TiO2 P-25 Degussa. Penelitian juga memberikan gambaran bahwa mineral Ilmenit Bangka Indonesiaberpotensi besar sebagai bahan baku dalam pembuatan katalis Fe2O3-TiO2. AbstractThe current work presents the results of investigation on the decreasing levels of BOD5, COD, TDS ofleachate on the landfill (TPA) Cilowong by using Fe2O3-TiO2 catalyst derived from the extraction process ofBangka Indonesia ilmenite as well as commercial TiO2 P-25 Degussa catalysts. The measurement wascarried out in a photocatalytic reactor of 30 x 15 x 20 cm equipped with a 50 watt UV radiation. The processwas performed for 90 minutes at room temperature, and the samples were taken every 15 min for BOD,COD, and TDS analyses. The ratio of leachate to H2O (%v) was varied as 1/4; 1/8; 1/12 and 1/16, with theamount of catalyst used was 1 gram. The result on ratio of leachate to H2O of 1/16 showed the decrease inBOD5, COD, TDS with the use of Fe2O3-TiO2 catalysts by 45; 90.43 and 100% for Fe2O3-TiO2 catalysts,while with the use of Degussa P-25 TiO2 catalysts the decrease in BOD5, COD, TDS reached by 80.6; 75 and100%, respectively. On the basis of findings, it is shown that Ilmenite Bangka Indonesia has great potentialas a raw material for synthesizing the Fe2O3-TiO2 catalysts.
ULTRASONIC TREATMENT EFFECT ON THE CONSOLIDATION OF Fe-Cr PARTICLE MIXTURES AFTER COMPACTION AND SINTERING PROCESS Silalahi, Marzuki; Untoro, Pudji; Suharno, Bambang; Harjanto, Sri
Metalurgi Vol 29, No 2 (2014): Metalurgi Vol.29 No.2 Agustus 2014
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (449.765 KB) | DOI: 10.14203/metalurgi.v29i2.289

Abstract

ULTRASONIC TREATMENT EFFECT ON THE CONSOLIDATION OF Fe-Cr PARTICLEMIXTURES AFTER COMPACTION AND SINTERING PROCESS. Fe-Cr microalloys which obtained byultrasonic method are the initial cores for the consolidation process. Therefore its facilitate the formation of thehomogeneous bulk of Fe-Cr alloy with a stable phase. In this research, the synthesis of bulk of Fe-Cr alloy fromthe particles mixture of (Fe+Cr) as the ultrasonic treatment results has been carried out. The particlesconsolidation has been carried out through a process of compaction without adding any lubricants and followedby sintering process in the quartz glass capsules by using induction furnace at 1300 °C. Consolidation of mixtureof Fe-Cr particles that have not undergone previous ultrasonic treatment is also made for a comparison. Theinvestigation by using the SEM (scanning electron microscope)- and density measurements method werepreformed on the Fe-Cr green powders compaction. The bulk of Fe-Cr alloys that are produced trough sinteringprocess was observed using SEM-EDS (energy dispersive spectroscopy), XRD (x-ray diffraction), and densitymeasurements method. The bulk of Fe-Cr alloy prepared with ultrasonically treated Fe-Cr microalloy powders,is more homogeneous in composition and has a better phase stability in comparison to Fe-Cr powders preparedwithout the ultrasonic treatment. Production of bulk Fe-Cr alloy in quartz glass capsule during the sinteringprocess has produced Fe-Cr alloy without oxides.
Pemanfaatan Karbon Biomassa sebagai Reduktor dalam Ekstraksi Fe-Ni dari Bijih Nikel Laterit Abidin, Faizinal; Harjanto, Sri; Kawigraha, Aji; P, Nur Vita
Prosiding Seminar Nasional Teknoka Vol 3 (2018): Prosiding Seminar Nasional Teknoka ke - 3
Publisher : Fakultas Teknik, Universitas Muhammadiyah Prof. Dr. Hamka, Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (385.151 KB) | DOI: 10.22236/teknoka.v3i0.2901

Abstract

Pada proses pengolahan bijih nikel laterit, kokas dan agen reduktor lain diperlukan sebagai bahan utama sumber karbon untuk mereduksi senyawa oksida dalam laterit. Salah satu alternatif untuk mengganti ketergantungan reduktor konvensional adalah karbon biomassa yang memiliki potensi untuk dijadikan sumber reduktor berkelanjutan. Dalam penelitian ini akan dilakukan proses reduksi langsung terhadap bijih nikel laterit untuk mendapatkan recovery besi dan nikel dengan menggunakan arang batok kelapa sebagai reduktor karbon biomassa. Reduksi dilakukan pada temperatur 1200OC ditahan 90 menit, pemanasan dilanjutkan sampai 1500OC dan ditahan 15 menit. Variasi penambahan arang batok kelapa yang digunakan adalah 25%, 37.5% dan 45% massa. Selain itu ditambahkan 10% CaCO3 untuk menurunkan titik lebur dan mengasilkan recovery Fe-Ni yang lebih tinggi. Uji komposisi kimia dilakukan pada bijih nikel laterit dan hasil reduksi untuk mengetahui recovery besi dan nikel. Analisa mineralogi dan karakterisasi struktur mikro untuk menganalisis pemetaan morfologi permukaan nikel laterit setelah reduksi.
Peran Laminar Air Flow Cabinet Dalam Uji Mikroorganisme Bagi Mahasiswa Tugas Akhir Di Laboratorium Biokimia Harjanto, Sri; Raharjo, R
Jurnal Pengelolaan Laboratorium Pendidikan Vol. 1, No. 1, Januari 2019
Publisher : Laboratorium Bio Teknologi, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (69.704 KB) | DOI: 10.14710/jplp.1.1.15-18

Abstract

Work safety and security in the laboratory environment is very much needed, especially those related to microorganisms. In this case the purpose of the survey is to find out what percentage of the success rate of inoculation or the planting of microorganisms using the Laminar Air Flow instrument. As for the method used based on the classification survey of the number of tools used. And from the observation / survey that the number of users of laminar water flow in the Biochemistry laboratory for 1 year (2017) shows a very significant number especially in certain months such as October - November reached 27, 31 users, overall the number of users was quite large. This means that the instrument is needed for its existence. Also from the types of activities carried out by the Final Project students so far by using these instruments can be well served means that the tool is able to help solve problems of students who are completing their research.
Penanganan Alat Dan Bahan Yang Baik Dalam Rangka Menunjang Kegiatan Di Laboratorium Kimia Raharjo, Raharjo; Harjanto, Sri
METANA Vol 13, No 2 (2017): Desember 2017
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (955.433 KB) | DOI: 10.14710/metana.v13i2.18017

Abstract

Fasilitas alat dan bahan di lingkungan laboratorium kimia bagi mahasiswa yang sedang menyelesaikan tugas penelitian merupakan suatu hal yang tidak bisa terpisahkan, dan sangat diperlukan keberadaanya. Maka  sistem kelola, cara penanganan dengan  baik dan benar terutama  yang berhubungan dengan bahan kimia ataupun alat gelas dan instrumen mulai dari proses pengadaan, penerimaan , pengemasan, penyimpanan sampai penyaluran, penggunaan sesuai dengan tata kelola yang baik dan benar, juga ditunjang pelayanan yang memadai akan sangat membantu dalam rangka penyelesaian kegiatan penelitian mahasiswa Tugas Akhir di laboratorium kimia. Handling of good equipments and materials to order to supply activities studensts at the chemical laboratory  Equipment and materials facilities in chemical laboratory environment for students who are completing research tasks is an inseparable, and indispensable condition. Therefore, good and proper handling system, especially those related to chemicals or glassware and instruments starting from the procurement, receiving, packaging, storage until distribution, use in accordance with good and correct governance, also supported by adequate services will very helpful in the completion of research activities of Final Final students in the chemistry laboratory.
Peran Laminar Air Flow Cabinet Dalam Uji Mikroorganisme Untuk Menunjang Keselamatan Kerja Mahasiswa Di Laboratorium Mikrobiologi Harjanto, Sri; Raharjo, Raharjo
METANA Vol 13, No 2 (2017): Desember 2017
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (977.466 KB) | DOI: 10.14710/metana.v13i2.18016

Abstract

Keamanan dan keselamatan kerja di lingkungan laboratorium sangat dibutuhkan , seperti di laboratorium mikrobiologi. Untuk menunjang hal tersebut di atas peran Laminar air flow cabinet dirasa sangat penting akan keberadaannya karena mempunyai tingkat keamana dan keselamatan bagi pemakai yang lebih tinggi dibandingkan jika kita masih menggunakan peralatan sederhana seperti inkas. Lebih –lebih untuk penanganan bakteri yang bersifat patogen. Di laboratorium mikrobiologi ini melayani mahasiswa yang mengambil mata kuliah praktikum pendidikan juga mahasiswa yang sedang menyelesaikan penelitian Tugas Akhir. Dengan Laminar air flow cabinet ini didukung kedisiplinan serta bekerja sesuai peraturan tata tertib yang ada    diharapkan  bisa membantu menyelesaikan tugas dan bisa memberikan perlindungan serta  rasa aman bagi  mahasiswa tersebut. The role of  laminar air flow cabinet in the test of microorganism to presurve work safetyin student microbiology laboratory  Safety and safety in the laboratory environment is needed, as in the microbiology laboratory. To support the above, the role of Laminar air flow cabinet feels very important to its existence because it has a level of security and safety for users who are higher than if we still use simple equipment such as inkas. More-for the handling of bacteria that are pathogenic. In this microbiology laboratory serves students who take courses of educational practicum as well as students who are completing research Final Assignment. With Laminar air flow cabinet is supported by discipline and work according to existing rules of order are expected to help complete the task and can provide protection and a sense of security for the student. 
Effect of Contact Time on Interface Reaction between Aluminum Silicon (7% and 11%) Alloy and Steel Dies SKD 61 Suharno, Bambang; Nurhayati, Neni Octapiani; Arifin, Bustanul; Harjanto, Sri
Makara Journal of Technology Vol. 11, No. 2
Publisher : UI Scholars Hub

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Abstract

Effect of Contact Time on Interface Reaction between Aluminum Silicon (7% and 11%) Alloy and Steel Dies SKD 61. Die soldering (die sticking) is a defect of metal casting in which molten metal “welds” to the metallic die mold surface during casting process. Die soldering is the result of an interface reaction between the molten aluminum and the die material. Aluminum alloy with 7 and 11% silicon and SKD 61 die steel are the most common melt and die material used in aluminum die casting. This research is done to study the morphology and the characteristics of the formed AlxFeySiz intermetallic layer during interface reaction at dipping test. The samples of as-anneal SKD 61 tool steel was dipped into the molten of Al-7%Si held at temperature 680oC and into molten Al-11%Si held at temperature 710oC with the different contact time of 10 minutes; 30 minutes; and 50 minutes. The research results showed that the interface reaction can form a compact intermetallic layer with AlxFey phase and a broken intermetallic layer with AlxFeySiz phase on the surface of SKD 61 tool steel. The increasing of the contact time by the immersion of material SKD 61 tool steel in both of molten Al-7%Si and Al-11%Si will increase the thickness of the AlxFeySiz intermetallic layer until an optimum point and then decreasing. The micro hardness of the AlxFeySiz intermetallic layer depends on the content of the iron. Increasing of the iron content in intermetallic layer will increase the micro hardness of the AlxFeySiz. This condition happened because the increasing of Fe content will cause forming of intermetallic AlxFeySiz phase becomes quicker.
Co-Authors Abidin, Faizinal Agus Sukarto Wismogroho, Agus Sukarto Akhmad Herman Yuwono Amal, Muhamad Ikhlasul Andriyah, Lia Arbi Dimyati Bambang Suharno Bustanul Arifin Duroriyatul Aulya, Duroriyatul Eny Kusrini Firdiyono, Firdiyono Hanny Hafiar Kawigraha, Aji Lalasari, Latifa Hanum Marzuki Silalahi N, Elfi Nofrijon Sofyan, Nofrijon Noviyanto, Alfian Nurhayati, Neni Octapiani Nurul Taufiqu Rochman P, Nur Vita Pudji Untoro Raharjo Raharjo Raharjo, R Sulistiyowati, Arini Sutono -, Sutono Wahyu Bambang Widayatno, Wahyu Bambang