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All Journal Jurnal Scientia Indonesia Physics Communication
Hidayati, Rahmanisa Nur
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Education Physics

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Hard Candy Dari Wortel dan Tomat dengan Tambahan Ekstrak Propolis Sebagai Penambah Nutrisi Untuk Mata Pada Waktu Kegiatan Daring Hidayati, Rahmanisa Nur
Jurnal Scientia Indonesia Vol 1, No 2 (2015): October 2015
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jsi.v1i2.27645

Abstract

Penghujung tahun 2020 Indonesia masih dilanda Covid-19 data sebaran terbaru menunjukan masih tingginya pasien Covid-19. Penerapan pembelajaran disaat pandemi Covid-19 dilakukan secara virtual.  Pengguna platfrom pembelajaran online mau tidak mau harus dapat mengakses internet dengan menggunakan smartphone, laptop maupun personal computer. Lamanya menatap komputer ataupun smartphone memberikan efek mata lelah. Upaya yang sebelumnya  dilakukan untuk mengurangi kelelahan mata akibat menatap terlalu lama menatap komputer ataupun smartphone yaitu dengan menambahkan screen protector, tetapi screen protector tidak dapat menjaga mata terus menerus sehingga diperlukan sebuah suplemen yang mampu memberikan nutrisi untuk mata agar tetap terjaga kesehatannya. Wortel dan tomat merupakan sumber makanan yang kaya akan vitamin A. Pembuatan permen dari bahan dasar wortel sebagai solusi penambah vitamin A dengan menambahka tomat dan ekstra propolis produk permen ini tidak hanya penambah vitaminA tetapi dapat dijadikan sebagai permen kesehatan gigi.
Potential of Soundproof Wallpaper Based on Indigenous Materials Hidayati, Rahmanisa Nur; Wulan, Dewi Candra; Fauziah, Amalia; Rahayu, Ngesti; Subali, Bambang
Jurnal Scientia Indonesia Vol 1, No 2 (2015): October 2015
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jsi.v1i2.32609

Abstract

Noise exposure can occur at any time and interfere with a person's psychological and biological condition. Alternative materials from banana midrib and soybean dregs can be used as sound absorbers based on their characteristics and abundance. This research aims to analyze the optimal composition for sound-absorbing composite materials from banana midrib and soybean dregs and the effect of adding a layer of varnish to its absorption capacity. The method includes the manufacture of the sample, the impedance tube, the box acoustic approach, and the CCD test. The drying process of banana midrib is divided into two types, namely those that are dried in the sun and oven with the banana midrib having gone through a 5% NaOH immersion process before drying. The application of varnish on the sample used the cold spray technique so the layer is not thick and provides durability and resistance to the sample. The impedance tube was carried out to analyze the value of the sound absorption coefficient of the sample at several frequencies which were then averaged. After being tested with the box acoustic approach, the sample has the ability to reduce sound when applied to the walls of the room with an average percentage decrease of 10.84%. Through the CCD test, it is known that the size and number of pores distribution affects the sound absorption capacity. Banana midrib and soybean dregs can be used as an alternative to sound absorbers with the average value meeting the ISO 11654 standard, which is 0.15.
Potential of Soundproof Wallpaper Based on Indigenous Materials Hidayati, Rahmanisa Nur; Wulan, Dewi Candra; Fauziah, Amalia; Rahayu, Ngesti; Subali, Bambang
Physics Communication Vol 5, No 2 (2021): August 2021
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/physcomm.v5i2.32704

Abstract

Noise exposure can occur at any time and interfere with a person's psychological and biological condition. Alternative materials from banana midrib and soybean dregs can be used as sound absorbers based on their characteristics and abundance. This research aims to analyze the optimal composition for sound-absorbing composite materials from banana midrib and soybean dregs and the effect of adding a layer of varnish to its absorption capacity. The method includes the manufacture of the sample, the impedance tube, the box acoustic approach, and the CCD test. The drying process of banana midrib is divided into two types, namely those that are dried in the sun and oven with the banana midrib having gone through a 5% NaOH immersion process before drying. The application of varnish on the sample used the cold spray technique so the layer is not thick and provides durability and resistance to the sample. The impedance tube was carried out to analyze the value of the sound absorption coefficient of the sample at several frequencies which were then averaged. After being tested with the box acoustic approach, the sample has the ability to reduce sound when applied to the walls of the room with an average percentage decrease of 10.84%. Through the CCD test, it is known that the size and number of pores distribution affects the sound absorption capacity. Banana midrib and soybean dregs can be used as an alternative to sound absorbers with the average value meeting the ISO 11654 standard, which is 0.15.
Co-Authors Amalia Fauziah Bambang Subali Rahayu, Ngesti Wulan, Dewi Candra