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Widyariset
Published by Lembaga Ilmu Pengetahuan Indonesia
ISSN : 14117932     EISSN : 24610976     DOI : -
Core Subject : Engineering,
Engineering
Widyariset is a scientific journal which publishes the results of research and development, assessment and systematic thinking about science and technology. The writers of the scientific papers in this journal come from researchers/researcher candidates from various institutions' research and development (R&D), and universities. Widyariset is published regularly three times a year: in April for the issue of Social Sciences and Humanities (IPSK), in August for the issue of Natural Sciences (IPA) and in December for the issue of Engineering Sciences (IPT).
Arjuna Subject : -
Articles 485 Documents
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PENGARUH PENAMBAHAN KONSENTRASI INHIBITOR EKSTRAK DAUN TALAS TERHADAP LAJU KOROSI PADA BAJA API 5L X-52 DENGAN MEDIA KOROSIF H2SO4 0,5 M Gadang Priyotomo, S.T., M.Si.; Herdy Sumada Sitepu; Yanyan dwiyanti
Widyariset Vol 5, No 1 (2019): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.5.1.2019.30-36

Abstract

Inhibitor merupakan salah satu alternatif untuk mengendalikan laju korosi.Pada umumnya bahan yang digunakan sebagai inhibitor adalah bahan kimia yang tidak ramah lingkungan.Oleh karena itu, berbagai penelitian dilakukan untuk mendapatkan inhibitor dari bahan alam yang mengandung antioksidan tinggi.Salah satu tumbuhan tersebut adalah daun talas. Dalam penelitian ini digunakan baja karbon API 5L X-52, dengan media korosif H2SO4 0,5 M dan variasi konsentrasi dari ekstrak daun talas 0 ppm, 500 ppm, 1000 ppm, 5000 ppm, dan 10000 ppm. Daun talas diekstrak dengan menggunakan metode maserasi. Efektivitas penggunaan inhibitor organik daun talas dalam asam akan diketahui melalui Uji Imersi (Weight Loss). Hasil penelitian menunjukkan bahwa efisiensi inhibisi meningkat dengan peningkatan konsentrasi inhibitor, yang berarti semakin menurunnya laju korosi. Efisiensi inhibisi optimum diperoleh pada konsentrasi inhibitor 10000 ppm yaitu 79,53% dengan laju korosi 1,62218 mm/tahun.
PENGARUH VARIETAS DAN APLIKASI TEKNOLOGI BUDI DAYA TERHADAP KUALITAS UMBI BAWANG PUTIH Suwarni Tri Rahayu; Rofik Sinung Basuki; Poetry Sari Levianny
Widyariset Vol 6, No 2 (2020): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.6.2.2020.88-98

Abstract

Garlic demand in Indonesia currently still depends on import supply due to the low rate of production and its quality still inadequate to fulfill the consumer’s request who demand a bigger size. Therefore, the government has been developing garlic innovative cultivation technology, namely TIBBP, which expected to increase local garlic quality. This research aims to compare and identify the influence of TIBBP and farmer’s conventional cultivation technology and to compare the potential of garlic local variety, Lumbu Hijau and Tawangmangu Baru, on garlic bulb quality. This research was conducted in Tawangmangu, Karanganyar, Central Java. The result showed that TIBBP has been proven to increase garlic bulb quality compared to the farmer’s conventional technology. Tawangmangu Baru which cultivated with TIBBP has 32.69% bigger diameter and 11.5 gram heavier compared to Tawangmangu Baru which cultivated with the farmer’s conventional technology. Tawangmangu Baru proximate composition cultivated with TIBBP also showed better value compared to the farmer’s conventional technology. In general Tawangmangu Baru was also superior compared to Lumbu Hijau. This TIBBP might be disseminated and implemented broadly to increase garlic bulb quality in Indonesia.
COMPOSITION, STRUCTURE, CORRELATION AND LOCAL WISDOM OF ULIN (Eusideroxylon zwageri Teijsm. & Binn.) IN TAU LUMBIS- NORT BORNEO asep sadili
Widyariset Vol 5, No 2 (2019): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.5.2.2019.75-86

Abstract

The species of iron wood or locally known as ulin/tahas, is recognized as strong and durable. This study aims to provide information about condition and corelation of iron woods in natural forests of Tau Lumbis area, including its utilization and conservation through local knowledge of Dayak Akolod and Tagol tribes. The study was conducted in natural forests in Kabungolor and Kabalob (North Kalimantan). It used a plot and selected ulin tree as the midpoint of the plot. Each trees with diameter > 10 cm in the plot were measured for its stem circumference at ±1.3 m from the ground. There were 13 individuals/ha of ulin trees in Kabalob plot and 25 individuals/ha of ulin trees in Kabungolor plot (an average of ±19 individuals/ha). Based on the density measurements, there were no correlation between ulin tree and other trees species in the two locations. The iron woods were used for various needs from generation to generation by the Dayak Akolod and DTagol tribes without paying much of attention to its conservation.
Electrochemical Performance of Li4-xTi5CuxO12 for Lithium Ion Capacitor Applications Ahmad Sohib; Achmad Subhan; Wahyu Bambang Widayatno; Slamet Priyono; Chairul Hudaya; Ilma Nuroniah; Sherly Novia Sari; Bambang Prihandoko
Widyariset Vol 6, No 1 (2020): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.6.1.2020.43-50

Abstract

Lithium titanat (LTO) has attracted considerable attention since it has unique characteristics for energy storage application. Doped LTO is one of approach to improve LTO performance. To date, doped LTO performance in full cell lithium ion capacitor has rarely been discussed. This study is aimed to synthesize Cu-doped LTO via solid state reaction and high energy milling and investigate its electrochemical performance in full cell of lithium ion capacitor. Cu-doped LTO is synthesized via solid state method with high energy milling. Diffraction pattern exhibit that Cu-doped LTO has been successfully synthesized even some impurities such as Baddeleyite, ZrO2, and Li2O appear in each sample. Cyclic voltammogram profile of half-cell based Cu-doped LTO shows that the oxidation and reduction peaks are declined due to its impurities contain. electrical resistance of LTO and Cu-doped LTO becomes smaller as increasing dopant contain while charge transfer resistance is higher. Full cell performance of LIC represent that undoped  LTO//Activated carbon shows higher capacitance, namely 430 µFg-1 at specific current of 50 mAg-1than that of 2.5%-Cu-doped LTO//AC holds 15 µFg-1.
PERILAKU KOROSI ATMOSFER BAJA GALVANIS SETELAH EKSPOS SINGKAT DI PELABUHAN RATU, JAWA BARAT Gadang Priyotomo, S.T., M.Si.; Siska Prifiharni; Lutviasari Nuraini; Ahmad Royani; Sundjono Sunjono; Hadi Gunawan
Widyariset Vol 5, No 1 (2019): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.5.1.2019.37-46

Abstract

Studi korosi atmosfer baja galvanis dilakukan di daerah pantai Pelabuhan Ratu, Jawa Barat, dimana diatur waktu ekspos hingga 76 hari. Perfoma ketahanan korosinya ditentukan dengan metode kehilangan berat. Morfologi permukaan, komposisi unsur dan senyawa produk korosi baja galvanis diamati dengan menggunakan scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-Ray diffraction (XRD). Faktor lingkungan udara yang mempengaruhi proses korosi dimonitoring selama ekspos antara lain kelembaban relatif, suhu udara, suhu embun dan salinitas udara. Berdasarkan hasil, nilai laju korosi material adalah 0,64 mpy di waktu ekspos 27 hari dan 0,12 mpy di 76 hari. Prediksi umur pakai lapisan seng baja galvanis adalah 18 tahun. Kombinasi waktu basah dan kering bergantian ditandai dengan fluktuasi kelembaban udara dan suhu menciptakan lapisan protektif kusam dan kelabu seiring peningkatan waktu ekspos. Keberadaan klorida sebagai pemercepat reaksi korosi kurang berperan, dikarenakan kadar salinitas yang kecil. Fasa produk lapisan seng adalah zincite (ZnO) dan hydrozincite (Zn5(CO3)2.(OH)6) dimana lapisan tersebut sangat protektif untuk serangan korosi berlanjut.
PENGARUH JUMLAH SALURAN MASUK UDARA TERHADAP DISTRIBUSI KECEPATAN UDARA PENGERING PADA ALAT PENGERING TIPE SWIRLING FLUIDIZED BED Satya Andika Putra; Novrinaldi Novrinaldi Novrinaldi
Widyariset Vol 6, No 2 (2020): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.6.2.2020.99-106

Abstract

Numerical and experimental studies have been carried out on the effect of inlet air number to the air velocity distribution in the drying chamber of the Swirling Fluidized Bed Dryer (SFBD). The main components of SFBD are a drying chamber, plenum chamber, center body, distributor, inlet air, heater, and blower. Numerical analysis was performed using the finite volume method on a three-dimensional model using computational fluid dynamic (CFD) software. An experimental study was carried out by measuring the air velocity at eight measurement points in the drying chamber. The results showed that using two inlet air produced a more uniform distribution of air velocity compared to one inlet air.
ANALISIS KANDUNGAN (AIR, ABU, DAN LOGAM BERAT) PADA KOPI BUBUK ASAL GAYO bhayu gita bhernama
Widyariset Vol 5, No 2 (2019): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.5.2.2019.87-94

Abstract

Gayo coffee is one type of arabica coffee originating from the Gayo plateau, Central Aceh district. Where Gayo coffee has a distinctive flavor, strong aroma and taste specifically. In the Gayo coffee processing process, it is inseparable from various kinds of contamination, so analysis needs to be done. Analysis was carried out on two coffee samples taken from two factories, namely factories A and B. Analysis carried out included analysis of water, ash, and metal content of ground coffee originating from Gayo. The analysis of metal content was carried out by using Atomic Absorbtion Spectroscopy (AAS). The test results showed that coffee A had a water content of 0.0397% and ash content 4% while coffee B had a water content of 0.01772% and ash content 4.3%. The test results of heavy metal within coffee A and B revealed that the contaminants of Cu, Hg, Pb and Zn metals existed. The coffee A contained Cu and Hg metal contamination with levels of 6.4945 and 0.0029 mg/Kg respectively. While, the coffee B contained Cu and Hg metal contamination with levels of 7.6120 and 0.0042 mg/Kg, respectively. The contamination of Pb and Zn within the coffee A and B were low and insignificant (0.001 mg/Kg). From the results of the analysis, it was found that the water, ash and metal content in coffee A and coffee B complies to the Indonesian National Standards (SNI) 01-3542-2004.
COMPARISON OF RAYLEIGH WAVE CHARACTERISTICS ON SUPERCONDUCTING GRAVIMETER AND SESIMOMETER LHZ RECORDINGS MARISKA NATALIA RANDE; Mahmud Yusuf; Alexander F. T Parera
Widyariset Vol 5, No 1 (2019): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.5.1.2019.11-20

Abstract

The vibrations of an earthquake can be properly recorded by the gravimeter. As a Gravimeter, Superconducting Gravimeter (SG) has a very high accuracy; slightly different with general gravimeter. Rayleigh wave is the wave with the largest amplitude in earthquake, so it will be clear on SG tape.  In this research, we use certain superconducting gravimeter (SG) and Seismometer LHZ, spread over several locations around the world; just to know more about Mw > 6 earthquake. Tidal value reduction were applied on SG’s recording in order  to get true gravity value. Then we did time-integral to get velocity and displacement. By using spectrogram function, we can display frequency of SG and LHZ. The amplitude of the Rayleigh wave recorded on the SG is smaller than that recorded on the LHZ and has signal correlation > 7.0. In any case of Rayleigh Global waves, SG is able to record clearly the phase of Rayleigh wave to R7 phase. While LHZ only records up to the R5 phase. The spectrograph analysis reinforces the differences in the viewing screens of SG and LHZ Rayleigh Global waves in the frequency domain, R7 recorded on SG has a frequency range of 0.002 Hz to 0.006 Hz. Based on the results of Rayleigh wave analysis on the SG record and its comparison with the LHZ record it can be concluded that SG has a high level of sensitivity and stable when recording Rayleigh waves.
DETEKSI TEPI UNTUK VALIDASI MODEL TIGA DIMENSI TULANG PANGGUL PADA PERENCANAAN DESAIN IMPLAN Talitha Asmaria; Rafidah Rahmi; Muhammad Satrio Utomo; Dhyah Annur; Daniel Panghihutan Malau; Muhamad Ikhlasul Amal; Ika Kartika
Widyariset Vol 6, No 1 (2020): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.6.1.2020.51-61

Abstract

In the process of implant design and fabrication planning, the anatomical background of human bone is an important aspect to determine the accuracy of implant design. To help in understanding the human bone anatomy, replicas of human bone can be reconstructed using three-dimensional (3D) printing technology. This study aims to validate the digital model of human bone and the imaging data of human bone in order to have an appropriate recommendation for designing the total hip replacement (THR). Achieved data from computed tomography scanning (CT-Scan) modality was deciphered to build the digital 3D model human bone. The bone and the digital 3D model of bone were captured to be two-dimensional(2D) data in the same dimension and processed using the algorithm of edge detection. The images from the edge detection process were processed for finding the similarity of the images. The percentage of similarity, precision, and  accuracy between the bone and the digital 3D model have been validated and can be used as a reference in the THR designs.
Kajian Pemanfaatan Eceng Gondok (Eichornia crassipes) Sebagai Pakan Ternak Itik Alabio (Anas platyrhynchos Borneo) Siska Fitriyanti
Widyariset Vol 5, No 2 (2019): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.5.2.2019.47-53

Abstract

An efficient feeding strategy is utilizing abundant and nutritious local resources for livestock. Fermented hyacinths can be used as a substitute feed for ducks, which are widely available in natureand still not well utilized. On the other hand, water hyacinth also has a fairly good nutritional content to serve as a ducks feed intake. The purpose of this study is to determine the effect of feed consisting of water hyacinth fermentation to the growth of Alabio ducks. The results obtained were feed with 75% concentration of fermented hyacinths giving the best result for Alabio duck growth when compared with duck given commercial feed.

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