In this study, we analyzed the characteristics of samples sound absorption coefficient from sponge and styrofoam using a smartphone. The sound absorption coefficient is measured using a sound level meter and a frequency generator installed on a smartphone to determine the sound absorption coefficient. Samples were formed in circles with different thickness variations ranging from 1.5 cm to 15 cm. Through the tests that have been done, it can be seen that styrofoam has a higher sound absorption coefficient value than sponges. This research provides an alternative solution for measuring the sound absorption coefficient based on a smartphone device so that it is easy to apply, primarily to support the learning process related to sound material.
Sintesis karbon aktif yang berasal dari limbah kulit lada sebagai material pengolahan air pasca tambang timah (kulong) di Propinsi Kepulauan Bangka Belitung telah dilakukan. Karbon aktif dipreparasi secara kimia menggunakan aktivator KOH 3M dengan nisbah 1:4 dan dikuti dengan aktivasi secara fisika dengan aliran gas N2 pada suhu 600 0 C selama 3 jam. Sampel karbon aktif hasil preparasi dan telah mengalami pencucian hingga pH netral selanjutnya dikarakterisasi menggunakan SEM-EDX untuk mengetahui struktur morfologinya. Kemudian sampel karbon aktif dilakukan pengujian pada air kulong dengan parameter tingkat kekeruhan dan Atomic Absorbtion Spectrophotometry (AAS). Hasil SEM-EDX menunjukkan bahwa morfologi sampel berpori, selain itu hasil uji tingkat kekeruhan dengan perlakukan penambahan karbon aktif mengalami penurunan. Hasil serupa juga terjadi pada pengujian menggunakan uji AAS. Berdasarkan hasil pengujian dapat disimpulkan bahwa karbon aktif limbah kulit lada dapat dijadikan sebagai material penyerap pada proses pengolahan air pasca tambang timah (kulong).
The purpose of this study is to examine the use of an accounting system using Microsoft Excel, the reliability of the accounting system used previously as well as the factors that influence the successful implementation of the Acosys software-based accounting information system at PT Ladfanid Konsultindo Batam. In implementation, in Microsoft Excel presenting financial statements, especially for trading and manufacturing companies in the calculation of cost of goods sold, there must be a classification beforehand because Microsoft Excel does not have a special menu in the presentation of purchases and sales so that there are several classifications in different sheets. The accounting system used today is Acosys, which is an accounting system that is more adequate and reliable than using Microsoft Excel. Acosys can be categorized as a complex system in preparing financial statements because it has features that can be used according to company needs. every transaction that has been inputted automatically all kinds of reports relating to finance can be accessed quickly as needed. What is rarely owned by other software but owned by Acosys is that Acosys software can be used forever without additional costs for updating.
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