PERANCANGAN ALAT TIMBANGAN DIGITAL BERBASIS ARDUINO LEONARDO MENGGUNAKAN SENSOR LOAD CELL

Kemajuan teknologi membawa perubahan pada peralatan-peralatan yang dahulu bekerja secara analog, mulai dikembangkan dengan teknik digital dan bahkan yang bekerja secara manual sekarang mulai banyak dikembangkan secara otomatis, seperti halnya alat timbang digital. Timbangan digital merupakan alat ukur untuk mengukur massa benda atau zat dengan tampilan digital. Penelitian ini dibuat dengan tujuan menghasilkan sebuah alat timbangan digital berbasis board Arduino Leonardo. Arduino Leonardo telah terintegrasi dengan mikrokontroler Atmega32u4, menggunakan load cell sebagai sensor beban dengan tampilan nilai beban menggunakan LCD jenis 16 x 2 sehingga hasil pengukuran dapat lebih mudah dibaca dan memiliki ketelitian yang lebih baik dibanding timbangan analog. Pengujian alat dilakukan dengan membandingkan antara timbangan yang dibuat dengan timbangan standar. Peralatan yang dibuat mendekati tingkat akurasi peralatan standar (Kern PCB 1000-2), dimana selisih rata-rata adalah 0,66 gram.

POTENSI KITOSAN DARI LIMBAH CANGKANG UDANG Penaeus monodon ASAL BINTUNI SEBAGAI BIOSORBEN LIMBAH ORGANIK DAN LOGAM BERAT PADA LIMBAH CAIR PLTD MANOKWARI

The purpose of this research is to study the potency of chitosan synthesis of shrimp shells from Bintuni as a biosorbent of organic compound and heavy metal compound. The main procedure of chitosan synthesis is completed by insulating chitin from shrimp shells and then chitin is deacetilated to transform chitin to be chitosan. The wastewater were characterized to know the concentration of Total Organic Carbon (TOC), fat oil, and Zinc metal and studied the adsorption of each compound at 0,1; 0,5; 1; 2g dosage chitosan. Adsorption study result showed that chitosan can adsorb the fuel oil and Zinc metal which contained in wastewater. However, it was not adsorb the TOC compound. The yield of chitosan is 46,88%. Increasing the chitosan by up to 2 g resulted in the creasing of the adsorption effectiveness up to 99,09% for the fuel oil and 69,28% for Zinc. The maximum chitosan adsorption capacity accomplished at 0,1gram chitosan in 100 mL wastewater.

IDENTIFIKASI KAWASAN NILAI KONSERVASI TINGGI 4 (NKT 4) DI DAERAH ALIRAN SUNGAI WAFOR, KABUPATEN SUPIORI, PROVINSI PAPUA

Salah satu atribut dalan NKT adalah Kawasan yang memberikan jasa ekosistem dasar pada situasi yang kritis atau sangat penting. Suatu wilayah dapat dipertimbangkan sebagai NKT 4 jika berperan dalam melindungi atau menyediakan jasa ekosistem mendasar dalam situasi penting, termasuk perlindungan daerah tangkapan air dan kontrol erosi pada tanah rentan dan lereng. Saat ini telah dilakukan penilaian keberadaan NKT 4 Daerah Aliran Sungai (DAS) Wafor yang berada di Distrik Supiori Timur, Kabupaten Supiori, Provinsi Papua. Sungai-sungai di DAS Wafor dimanfaatkan oleh masyarakat lokal sebagai sumber air bersih. Sungai Wafor memiliki rasio relief rata-rata antara 0.04, namum dibeberapa tempat terutama bagian hulu, kemiringan lereng mencapai 30%-40%. Faktor bentuk (Form factor/ Rf) DAS Wafor memiliki nilai 0.62 atau bentuk DAS relatif membulat dan rasio elongasi sebesar 0.71. Daerah aliran sungai yang membulat, debit puncak datangnya lama, begitu juga penurunannya, sehingga dapat efektif dalam mengendalikan banjir.DAS Wafor memiliki kerapatan drainase (Dd) 1,03 km/km2, artinya setiap 1 km2 area DAS terpadat panjang total sungai 1,03 km. Kerapatan drainase ini termasuk kategori sedang. Hal ini tentunya akan sangat membantu dalam menghalangi penyebaran titik-titik api jika terjadi kebakaran hutan. Sedimentasi di Sungai Wafor termasuk kategori rendah atau < 50 mg/L. Dengan alur sungai rata-rata tidak lebih dari 20 km, maka dapat disimpulkan bahwa DAS tersebut bekerja efektif dalam mengendalikan erosi.

VARIASI KUAT MEDAN MAGNET DAN DAYA LISTRIK INPUT TERHADAP KARAKTERISTIK MOTOR LISTRIK DC DUA KUTUB

Penelitian tentang variasi medan magnet dan daya listrik input terhadap karakteristik motor listrik DC bertujuan untuk mengetahui pengaruh kuat medan magnet dan pengaruh besar daya listrik input terhadap RPM, efisiensi, dan torsi motor listrik DC serta mengetahui pengaruh kuat medan magnet permanen terhadap daya listrik input. Penelitian ini merupakan penelitian eksperimen, yang dimulai dengan pembuatan alat, pengambilan data, kemudian pengolahan data. Dalam pengambilan data, data yang diukur adalah tegangan listrik input, tegangan listrik output, arus listrik input, arus listrik output dan RPM. Hasil dari pengolahan data diperoleh bahwa setiap penambahan jumlah magnet akan menyebabkan RPM meningkat, daya listrik menurun, torsi menurun, dan efisiensi yang paling tertinggi 80.564% pada jumlah satu magnet. Sedangkan setiap penambahan daya listrik input menyebabkan RPM meningkat, torsi meningkat, dan efisiensi tertinggi pada tegangan listrik power supply 12 Volt yaitu 83.366%.

PEMBUATAN SISTEM VAKUM OTOMATIS GAS H2S BERBAHAN TiO2-Ni/Al2O3 TERKONEKSI ARDUINO UNO PADA LABORATORIUM KIMIA

Research has been carried out on the H2S gas sensor made of TiO2-Ni/Al2O3 which is connected to an automatic vacuum. The results showed that the optimum conditions for the variation of Ni doping metal levels were 20 mg / gram TiO2. The semiconductor material synthesis method used the sol gel method with TTiP precursor which was made at pH 7. Coating of the sol gel solution on the Al2O3 substrate used a dip coater with a decrease speed of 1 cm / minute and was carried out 7 times of immersion. The characterization of synthetic results used UVVis, XRD, FTIR and SEM-EDX. The band gap value resulting from Ni doping is 2.75 eV from 3.2 eV, XRD identification shows that TiO2 is anataseic and detected at 2θ. FTIR data also supports XRD results with detection of TiO2, Ni-O, NiTiO3, Ti-O-Ni, and Ti-O-Ti groups. TiO2-Ni / Al2O3 sensor test results are very sensitive and selective to H2S gas. Arduino Uno sensor and microcontroller connectivity can change the unit of resistance into a unit of ppm concentration and can drive the exhaust (vacuum) automatically in the laboratory room or chemical storage space when there is H2S.

KAJIAN TENTANG VARIASI KONSENTRASI NaCl DENGAN KETERSEDIAAN ENERGI LISTRIK PADA SEL VOLTA Cu-Zn

Kajian Tentang Variasi Konsentrasi NaCl Dengan Ketersediaan Energi Listrik Pada Sel Volta Cu-Zn bertujuan untuk menganalisa hubungan antara jumlah sel volta Cu-Zn terhadap besar arus listrik dan tegangan listrik, perubahan arus listrik, tegangan listrik dan daya listrik terhadap waktu, jumlah akumulasi energi pada sel volta Cu-Zn terhadap beberapa konsentrasi NaCl (0,001M; 0,01M; 0,1M; 1M; 10M). Hasil penelitian ini diketahui semakin tinggi konsentrasi NaCl maka tegangan yang dihasilkan semakin kecil sebaliknya jika konsentrasi NaCl tinggi maka arus listrik yang dihasilkan semakin meningkat. Pada penelitian ini konsentrasi NaCl yang paling baik adalah dengan konsentrasi 1 M dibandingkan dengan konsentrasi NaCl lainnya.

STUDI FITOREMEDIASI LOGAM TIMBAL (Pb) DAN KADMIUM (Cd) OLEH TANAMAN KAYAMBANG (Salvinia molesta)

Study phytoremediation of lead (Pb) and cadmium (Cd) by kayambang plants (Salvinia molesta) has been studied. This study assessed the ability of plants to absorb Pb and Cd which is influenced by the addition of various metal and NPK fertilizer on the medium containing the test solution. Samples of plants were interacted with NPK fertilizer, Pb and Cd. The variations of NPK 1 mg/L, I,5 mg/L, 2,5 mg/L and 10 mg/L and the variations of Pb (100 mg/L, 400 mg/L and 800 mg/L) and cadmium (50 mg/L, 100 mg/L and 200 mg/L). Optimum pH for growing the Kayambang plants (Salvinia molesta) is a range pH of 6-7. Observations were made every 7 days until the day of 35th, by measuring levels of Cd and Pb after the interaction of plants (roots, non-roots and growing media). The results showed that the Pb and Cd accumulation are higher at the root compared to non-root (stem and leaf). Effect of NPK fertilizer is very evident in the heavy plant where increasing levels of NPK fertilizer plant, the more heavy weight. The average value of FT in kayambang plants (Salvinia molesta)>1, then the plant can be used as a phytoremediator agent. The highest value FT of Pb is 11.22 and shown on condition [NPK] 10 mg/L, [Pb] 100 mg/L at day of 21th and for highest value FT of Cd is 9.57 and shown on condition [NPK] 10 mg/L, [Cd] 100 mg/L and day of 35th

UJI AKTIVITAS ANTIBAKTERI DAN SKRINING FITOKIMIA EKSTRAK HEKSANA, ETIL ASETAT DAN METANOL TUMBUHAN SURUHAN (Peperomia pellucida L. Kunth)

Antibacterial activity test and screening of phytochemical of extract hexane, ethyl acetate and methanol have been carried out. The extraction of the P.pellucida plants was carried out by the maceration method in stages based on the polarity of the solvent. Analysis of chemical compounds done with phytochemical screening test. Based on the identification of chemical compounds by phytochemical screening, hexane and ethyl acetate extract has been detected only in the presence of flavonoid compounds with moderate categories. Methanol extract contains high-grade alkaloids and moderate flavonoid and tannin compounds. Antibacterial test using disffusion methods suggest that ethyl acetate and methanol extract have categorically strong antibacterial activity againts the S. aureus of 14 mm and 16 mm respectively. Hexane extract and acetate ethyl have a strong inhibition to E. coli of 11 mm and 12 mm respectively. Methanol extract has a weak inhibition to bacteria E. coli and a hexane extract has a weak inhibition to bacteria S. aureus.

AKTIVITAS ANTIBAKTERI DAN KOMPONEN KIMIA EKSTRAK HEKSAN, ETIL ASETAT DAN ETANOL BATANG BROTOWALI (Tinospora crispa Linn) ASAL MANOKWARI

Antibacterial activity test and chemical component analysis of hexane, ethyl acetate and ethanol extract of Brotowali stem from Manokwari Regency against B. subtillis and E. coli have been carried out. The extraction of the T. crispa stems was carried out by the maceration method in stages based on the polarity of the solvent. Chemical component analysis was performed using GC-MS and phytochemical tests. Based on the identification of chemical compounds by phytochemical screening, it shows the presence of flavonoids in the hexane extract, while in the ethyl acetate and ethanol extracts there are alkaloids, flavonoids, saponins, and tannins. The results of the chemical component analysis of hexane, ethyl acetate and ethanol extracts with GC-MS showed that the hexane extract contained 55 chemical components with 11 main components, ethyl acetate extract consisted of 39 components with 8 main components and ethanol extract there were 57 components with 8 main components. The results of the antibacterial activity test using the well method showed that the hexane and ethyl acetate extracts showed better antibacterial activity than the ethanol extract against the two types of tested bacteria, namely E. coli and B. subtillis. The antibacterial activity of hexane and ethyl acetate extracts against E. coli was 11.00 and 14.00 mm, respectively and against B. subtillis were 7.00 and 7.50 mm, respectively.

STUDI KUANTITAS DAN KUALITAS MATA AIR KOBARI JAYA SEBAGAI SUMBER AIR BAKU DI KABUPATEN SUPIORI PROVINSI PAPUA

A study on the quantity and quality of the Kobari Jaya spring in Supiori Regency has been conducted. Research on the quality test of Kobari Jaya springs has never been conducted. This study uses descriptive methods and laboratory tests and uses a comparative method of test results against the quality standard value based on PERMENKES No. 492 Tahun 2010 tentang Persyaratan Air Minum. The test results show that the average meets quality standards. The instruments used to test water samples include AAS and UVVis spectrophotometer. Several parameters such as pH, COD, BOD, DO, Phosphate, Fecal Coliform and Total Coliform exceed the predetermined quality standard values. The cause of this high parameter occurs naturally. The test results concluded that the Kobari Jaya spring is very suitable to be used as a source of raw water supply in the Kobari Jaya area in particular and the Supiori area in general