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All Journal International Journal of Renewable Energy Development Prosiding SNATIF UPEJ Unnes Physics Education Journal
Puji Hartono
Universitas Muria Kudus
Chemistry Education Energy Physics

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APLIKASI PENGELOLAAN PRESENSI MAHASISWA MAGANG DI PERPUSTAKAAN UNIVERSITAS MURIA KUDUS Hartono, Puji; Listyorini, Tri; Jazuli, Ahmad
Prosiding SNATIF 2015: Prosiding Seminar Nasional Teknologi dan Informatika
Publisher : Prosiding SNATIF

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

Abstract

AbstrakSebuah apliaksi pengelolaan presensi mahasiswa magang dengan menggunakan web berfungsi untuk mendeteksi kehadiran mahasiswa magang melalui absen. Hal yang dideteksi pada sistem presensi ini antara lain tanggal dan jam mahasiswa tersebut hadir. Sehingga akan terekap secara efektif dan efisien, berguna mengetahui tingkat kedisiplinan mahasiswa magang dalam mengikuti program magang. Karakteristik barcode yang unik dalam menyandikan sejumlah data di gunakan dalam kartu ID, berguna untuk proses absen masuk dan absen pulang, menggunakan metode prototype dalam pembuatan sistem. Prototype adalah adalah implementasi bagian dari produk software yang secara typical fungsinya di batasi, reliabilitsnya rendah, tampilannya miskin, dan kurang ketegasan. Sebuah sistem untuk mempermudah proses absen, perekapan presensi mahasiswa magang dengan tingkat keamanan yang cukup aman dalam sebuah sistem.Kata kunci: Aplikasi, absen, barcode, prototype.
Pre-treatment of Used-Cooking Oil as Feed Stocks of Biodiesel Production by Using Activated Carbon and Clay Minerals Syah Putra, Rudy; Shabur Juliantoa, Tatang; Hartono, Puji; Dyah Puspitasaria, Ratih; Kurniawan, Angga
International Journal of Renewable Energy Development Vol 3, No 1 (2014): February 2014
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.3.1.33-35

Abstract

Many low-cost feedstock i.e. used-cooking oil (UCO) for the production of biodiesel fuel (BDF) has contained a large amount of water and high proportion of free fatty acids (FFAs). Therefore, a pre-treatment process to reduce the water content (<0.1 wt.%) and FFAs (<2.0 wt.%) were necessary in order to avoid an undesirable side reactions, such as saponification, which could lead to serious problem of product separation and low fatty acid methyl ester (FAME) yield. . In this study, a pre-treatment process of used cooking oil as a feedstock for the production of BDF by using various adsorbents such as Activated Carbon (AC) and various clay minerals, for example Smectite (S), Bentonite (B), Kaolinite (K), and Powdered Earthenware (PE) were evaluated. The oil obtained from pre-treatment was compared with oil without pre-treatment process. In this study, we reported a basic difference in material ability to the oil, depending on the adsorption condition with respect to the physico-chemical parameters, e.g. refractive index (R), density (ρ), FFAs, and water content (W). The results showed that the water content and FFAs in the oil has decreased when using AC as an adsorbent compared with clay minerals. However, the refractive index of oil has similar with the oil without pre-treatment process as well; meanwhile, the density of oil has increased after the pre-treatment process by using clay minerals.
Pengembangan Sistem Aplikasi Dalam Jaringan Untuk Tes Diagnostik Fluida Statis Pada Sekolah Menengah Atas Hartono, Puji; Sugiyanto, Sugiyanto; Nugroho, Sunyoto Eko
UPEJ Unnes Physics Education Journal Vol 10 No 2 (2021)
Publisher : UPEJ Unnes Physics Education Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/upej.v10i2.54185

Abstract

In this research, an online application system was developed for static fluid diagnostic tests in high schools. The aim of this study is to develop an online diagnostic test and determine its feasibility. This research is classified as research and development research. The development model used in this study is the Borg and Gall model. The resulting product supports several features, including registration, user management, question bank management, test bank management, test result management, mathematical symbols, and development support. From data collection using the scale method. There are several aspects tested in determining the feasibility of software, including functional suitability, performance efficiency, compatibility, usability, reliability, security, maintainability, portability, effectiveness, efficiency, satisfaction. The results show that an average percentage of feasibility is 90.07%. Based on these results, the developed diagnostic test can be used to identify student learning difficulties.
Co-Authors Ahmad Jazuli Angga Kurniawan Ratih Dyah Puspitasaria Rudy Syah Putra Sugiyanto - Sunyoto Eko Nugroho, Sunyoto Eko Tatang Shabur Juliantoa Tri Listyorini