Abstrak— Informasi alumni sangat penting dan dibutuhkan perguruan tinggi dalam proses akreditasi. Politeknik Negeri Lhokseumawe kesulitan dalam memperoleh informasi dan melakukan penelusuran terhadap alumninya yang telah tersebar ke berbagai wilayah di Indonesia. Tracer study alumni merupakan salah satu metode yang digunakan untuk menelusuri informasi mengenai alumni. Informasi yang diambil meliputi identitas pribadi alumni, riwayat pendidikan, riwayat pekerjaan. Salah satu data yang sulit untuk diperoleh adalah data valid mengenai alamat pekerjaan alumni serta cara menyajikan data alamat pekerjaan alumni. Oleh karena itu dibutuhkan suatu sistem informasi tracer study yang diharapkan memberi kemudahan bagi institusi dalam melakukan penulusuran terhadap alumni. Sistem informasi tracer studi ini dibangun berbasis Web, sehingga bisa diakses oleh semua alumni yang berada diseluruh Indonesia maupun berada diluar negeri. Sistem informasi tracer studi dibangun menggunakan metode waterfall, framework CodeIgniter dan database MySQL. Melalui sistem ini alumni dapat memasukkan data diri dan pekerjaannya sehingga akan mudah untuk melacak keberadaan alumni.Kata kunci— Tracer, alumni, informasi, waterfall, web. Abstract— Alumni information is very important and is needed by universities in the accreditation process. Lhokseumawe State Polytechnic has difficulty in obtaining information and conducting a trace of alumni who have spread to various regions in Indonesia. Alumni tracer study is one method used to trace information about alumni. Information taken includes alumni personal identity, education history, employment history. One of the data that is difficult to obtain is valid data regarding the address of the alumni's work and how to present the address data of the alumni work. Therefore, a tracer study information system is needed which is expected to provide convenience for institutions in conducting research on alumni. The tracer information system for this study was built based on the Web, so that it could be accessed by all alumni who were located throughout Indonesia and abroad. The study tracer information system is built using the Waterfall method, CodeIgniter framework and MySQL database. Through this system, alumni can enter their own data and work so that it will be easy to track the whereabouts of alumni.Keywords— Tracer, alumni, information, waterfall, web
In the present study, composite layer double hydroxide-metal oxide (Ni/Al-TiO2 and Ni/Al-ZnO) was successfully prepared and used as catalyst of oxidative desulfurization of dibenzothiophene. Characterization of catalyst was used XRD, FTIR, and SEM-EDS. The structure of Ni/Al-LDH, TiO2, and ZnO in composite Ni/Al-TiO2 and Ni/Al-ZnO was consistent, which also indicated that the preparation of composite did not change the form of precursors. FTIR spectra of Ni/Al-TiO2 and Ni/Al-ZnO absorption band at 3398, 1639, 1339, 832, 731, and 682 cm−1. The catalysts have an irregular structure, TiO2 and ZnO adhere to the surface of Ni/Al LDH. The percent mass of Ti and Zn on the composite at 29.3% and 18.2%, respectively. The acidity of Ni/Al LDH increased after being composited with TiO2 and ZnO. The optimum reaction time, dosage catalyst, and temperature were 30 min, 0.25 g, and 50°C, respectively, and n-hexane as a solvent. The percentage conversion of dibenzothiophene on Ni/Al-LDH, TiO2, ZnO, Ni/Al-TiO2, and Ni/Al-ZnO were 99.44%, 91.92%, 95.36%, 99.88%, and 99.90%, respectively. The catalysts are heterogeneous system and the advantage is that can be used for reusability. After 3 times catalytic reactions, the conversion of dibenzothiophene still retains more than 80%, even Ni/Al-TiO2 and Ni/Al-ZnO composites still 97.79% and 98.99%, respectively.
Modification of Mg/Al-LDH intercalated metal oxide (Mg/Al-Ni) was successfully formed by the coprecipitation method at pH 10, which is indicated by the XRD diffraction, FTIR spectrum, and BET analysis. Mg/Al-LDH increased surface area after intercalated Ni from 8.621 m2/g to 9.821 m2/g and improved performance in process regeneration which can be used in the three cycles. Mg/Al-LDH after intercalated metal oxide (Ni) increases adsorption capacity of is 69.930 mg/g to 71.429 mg/g for methyl orange (MO) and 77.519 mg/g to 98.039 mg/g for methyl red (MR). Equilibrium time on the adsorption process occurred at 90 minutes with adsorption kinetics followed pseudo-second-order (PSO). Thermodynamic parameters indicate that the adsorption process is spontaneous and endothermic with the physical adsorption process.
Tujuan utama penelitian ini adalah untuk menganalisis hubungan kausalitas antara konsumsi listrik per kapita dan PDB per kapita di Indonesia. Metode yang digunakan penelitian ini adalah pendekatan kuantitatif dengan variabel adalah konsumsi listrik dan PDB riil per kapita di Indonesia. Konsumsi listrik yang digunakan di sini adalah dalam satuan GWh. Sedangkan PDB yang digunakan adalah PDB per kapita dalam jutaan rupiah. Seluruh data yang digunakan adalah data sekunder yang berupa data runtut waktu selama periode 2006 - 2019 yang bersumber dari Badan Pusat Statistik. Hasil penelitian menunjukkan bahwa pertama, hasil uji kointegrasi menunjukkan tidak memiliki hubungan jangka panjang,; dan kedua, hasil uji granger causality menunjukkan hasil satu arah yaitu konsumsi listrik per kapita mempengaruhi PDB per kapita. Implikasi kebijakan berupa memaksimalkan sektor investasi dalam industrialisasi agar tingkat konsumsi listrik per kapita meningkat dan dapat menaikkan PDB perkapita.
In this study, the Zn/Al-TiO2 and Zn/Al-ZnO was successfully synthesized. The catalysts were characterized by X-ray Diffraction (XRD), Fourier Transform Infra Red (FTIR), and Scanning Electron Microscope—Energy Dispersive X-ray Spectroscopy (SEM-EDS). The typical diffraction peaks of Zn/Al-LDH, TiO2, and ZnO still appear in the Zn/Al-TiO2 and Zn/Al-ZnO composites, indicating that the composite preparation did not change the form of precursors. FTIR spectra of Zn/Al-TiO2 and Zn/Al-ZnO showed absorption band at 3448, 1627, 1381, 832, 779, and 686 cm-1. The catalysts have an irregular structure where the percent mass of Ti and Zn on the composite at 10.6% and 55.6%, respectively. The acidity of Zn/Al-LDH composite increased after being composed with TiO2 and ZnO. The percentage conversion dibenzothiophene on Zn/Al-ZnO, Zn/Al-TiO2, ZnO, Zn/Al-LDH, and TiO2 was 99.38%, 96.01%, 95.36%, 94.71%, and 91.92%, respectively. The heterogeneous systems of catalytic reaction was used for reusability. After 3 cycles catalytic reactions at 50 oC for 30 min, the percentage conversion of dibenzothiophene on Zn/Al-LDH, TiO2, ZnO, Zn/Al-TiO2, and Zn/Al-ZnO were 77.42%, 83.19%, 82.34%, 84.91%, and 89.71 %, respectively. The composites of Zn/Al-TiO2 and Zn/Al-ZnO have better reusability test than Zn/Al-LDH, TiO2, and ZnO, which proofing that Zn/Al-TiO2 and Zn/Al-ZnO have a stable structure. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
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