The effect of chemical activators on the properties activated carbon from sago waste was conducted in this study by using ZnCl2, H3PO4, KOH, and KMnO4 solutions. carbonized added to each solution, boiled at 85 °C for 4 h, heated 600 3 h. porosity, microstructural, proximate, surface chemistry analyses were carried out nitrogen adsorption with employing Brunauer Emmett Teller (BET) method Barret-Joyner-Halenda (BJH) calculation, scanning electron microscopy energy dispersive spectroscopy,...

In this research, local citrus fruits, namely Garut citrus, were analyzed for electrical properties related to physicochemical properties. Electrical measurement on fruit was done by using low alternating current with a frequency varying from 50 Hz 1 MHz. The fruits are placed between two plate electrodes and treated as dielectric material. parameters per unit of weight used in study compensate variations weight. impedance, resistance, reactance will decrease if the is increased. circuit...

Penelitian ini bertujuan untuk membuat biomaterial substitusi tulang yang menyerupai komposisi sebenarnya, terdiri dari mineral inorganik (apatit) dan bahan organik sebagai matriks. Pada penelitian metode presipitasi digunakan dalam pembuatan komposit apatit-kitosan dengan menggunakan cangkang telur ayam bebek sumber kalsium KH2PO4 sintetik posfat. Cangkang tulang, sedangkan matriks adalah kitosan kulit udang. dikalsinasi menghilangkan semua komponen karbonat (CO3) sehingga didapatkan CaO...

Guava (Psidium guajava L.) is an economically important fruit crop in Malaysia with annual production of 67,087 tons 2018 (FAO 2018). In February 2019, rot symptoms were observed postharvest on approximately 30% guava cv. Lohan collected from a commercial orchard the Rawang district (3°23'22.8"N 101°26'55.7"E) Selangor province, Malaysia. Symptoms fruits appeared as small, circular brown spots (ranging 5 to 20 mm diameter) that coalesced and rapidly expanded cover entire fruit. Severely...

Bio-battery is a device that generates electricity from organic compounds. However, compounds derived crops should be avoided in order to prevent food shortages. The tropical almond (Terminalia catappa L.) widely known as "ketapang" Indonesia considered potential bio-fuel cells for bio-batteries since it rich sugar, non-crop and grows abundantly Indonesia. In this study we developed bio-battery prototype paste. characterization of yields an average open cell voltage 0.98 ± 0.09 V, the power...

The analyses over protein and mineral content of mangrove crab shells from Merauke had been studied then it is presented in this paper. methods were started by cleaning the impurities, naturally dried for 24 hours, was grounded into form powder. results showed that raw powder shell contained 19.78 % Carbon (C), 24.53 Oxide (O), 4.81 MgO, 3.98 P2O5 71,42 CaO. calcined process has succeeded to decrease carbon content. minerals after at 1000 °C 6.27 Carbon, 28.96 Oxide, 5.78% 5,65 P2O5, 82,3%...

Abstract This study introduced the use of shells Merauke Mangrove crabs as a natural source calcium extracted through thermal decomposition process with various temperatures. The method adopted in this was carried out two stages; first, that have been cleansed and dried under sun for 24 hours, were mashed then it divided into parts. first section used analysis composition. While second part calcined at three different temperatures, 900°C, 1000°C 1100°C 5 hours before analysis. results XRF...

The Visual Basic Application (VBA) programming application has become a new choice by researchers to work on numerical solutions, since it is accessible wider user. Although the solution of harmonic oscillation been done in previous research, however using VBA was still limited. In this study we solved and plotted obtained simple motion that very close analytical solutions. It concluded results analysis with solutions provide same characteristics for both Euler Runge-Kutta second order...

In this study, we report the successful fabrication of calcium powders by utilizing mangrove crab shells originating from Merauke as a natural source bio-ceramic. Calcium were synthesized at different temperatures varying 800 to 1000 °C for 5 h in ambient atmosphere. It is observed that calcinations temperature plays significant role formation hydroxyapatite crystallite phase. From XRD and FTI characterization, it confirmed crystal was well with no more carbon phase remains. SEM image also...

Activated carbon is a powerful adsorption material which mainly used as pollutants adsorption. The properties own derived from the main functional groups or chemical atoms activation processes. In this study, activated was prepared waste sago and using two different chemicals agents called phosphoric acid potassium hydroxide. aim of study to identify surface group on produced. results showed that with activator contained OH, C=C, CO CH groups, while hydroxide O-H, C≡C, C-O C-H groups. These...

Panel surya memiliki karakteristik tegangan dan arus yang tidak linear berubah terhadap iradiansi temperatur permukaan panel mengakibatkan rendahnya efisiensi. Tetapi pada kurva terdapat suatu titik dimana dapat bekerja efisiensi maksimum sehingga menghasilkan daya keluaran paling besar. Jadi diperlukan sebuah metode agar melacak menjaganya tetap berada kerja tersebut. Pada pemodelan sel surya, digunakan sistem pelacakan berupa elektronik mengoperasikan modul optimum, ini akan memvariasikan...

This study explores the effect of fine aggregate on mortar properties and its application as a nuclear shield. was based hypothesis that types applied radiation shield determined level effectiveness preventing radiation. There are two sources used main ingredients for production in this research, namely iron sand river sand. Both were derived from respective regions Sarmi Jayapura, Papua. The results showed materials produced with provided better dispelling than compressive strength 21.62...

According to the SNI, type of concrete for use as nuclear radiation shielding is or mortar that contains hematite, ilmenite, magnetite, barite, ferrophosphorus synthesis. This study focused on characterization iron sand from and river Papua. The purpose this research was determine specific content gravity minerals in gravities sands were measured by manual experiment a laboratory, while their mineral calculated using XRF SEM - EDS method. result showed 2.66 2.50, respectively. method...

In this paper, we analyzed the effect of surface modification on properties active carbon from sago waste using varied oxidizers, namely H2O2, HNO3, and H2SO4. The ordinary has an initial area ​​546.6 m2∙g-1, with a phenol carboxylic functional group. porosity, groups morphological surface, together chemical composition activated were examined nitrogen adsorption-desorption through Brunauer Emmett Teller (BET) method calculation Barret-Joyner-Hall (BJH), Fourier-transformed infrared...

Carbonated hydroxyapatite (CHA) was successfully synthesized from pearl shells (Pinctada maxima) using the precipitation method with pH treatment variation. Based on X-ray diffractometer (XRD) results, caused crystallographic properties of CHA to decrease. The Fourier transform infrared spectroscopy (FTIR) data showed characteristics B-type CHA. energy dispersive X-Ray (EDS) analysis that a 10 had most significant carbonate content 6.3 wt%. transmission electron microscopy (TEM) analysis,...

Abstract There are concern about a massive volume of unused and dead coral reefs that lie along the coastline in Depapre district, Papua Province. The application this natural waste is strictly limited due to lack public knowledge advantage material for any purposes. This study aims determine potential by characterizing their morphology its crystal structure. One major advantages find out whether can suitable use as basic synthesis hydroxyapatite. three types obtained from area, including...

Bijih Nikel merupakan bahan alam yang banyak digunakan dalam bidang perindustrian mempunyai sifat tahan karat. Daerah Angkasapura Jayapura termasuk wilayah pengunungan Cycloop dengan berbagai jenis batuan. Tujuan dari penelitian ini adalah untuk menentukan profil nikel laterit, komposisi mineral struktur senyawa laterit dan morfologi permukaan di daerah Angkasapura. Penelitian dilakukan menggunakan metode geolistrik resistivitas konfigurasi Schlumberger. Hasil menunjukkan bahwa tersebar pada...

Telah dilakukan penelitian analisis kosntanta dilektik dan pengukuran total padatan atau partikel terlarut dalam air danau Sentani. Penelitian ini untuk mengetahui besar nilai dari konstanta dielektrik yang pada sentani. mengambil sample di sekitran kampung yoboi kabupaten Jayapura. Dimana didapatkan rata 112.8 ppm. Untuk penentuan tiap konsentrasi larutan kapasitansi dengan variasi jarak antar plat. Sebelum larutan, kalibrasi dahulu terhadap alat mengukur dilektrik udara sebesar 1,05. Nilai...