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Widyariset

widyariset
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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 SINTERING BERULANG TERHADAP STRUKTUR KRISTAL DAN MORFOLOGI PERMUKAAN BI,PB-SR-CA-CU-O YANG DIDOPING MG Fauzan Amri; Bintoro Siswayanti; Sigit Dwi Yudanto; Agung Imaduddin; Nurul Suhada; Rizki Syahfina; Eidi Sihombing
Widyariset Vol 4, No 2 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Telah dilakukan sintesis pelet superkonduktor Bi1.6Pb0.4Sr2Ca1.8Mg0.2Cu3O10+δ menggunakan metode padatan dan proses sintering berulang.Benda uji yang dibuat dianalisis dengan menggunakan XRD (X-ray Diffractometer) dan SEM – EDS (Scanning Elektron Microscopy - Energy Dispersive Spectroscopy). Berdasarkan analisis XRD didapatkan fase yang terbentuk adalah (Bi,Pb)-2223, (Bi,Pb)-2212, CaPbO3, Ca2PbO4 dan MgO. Perlakuan sintering berulang pada benda uji BPSCCO doping Mg dapat meningkatkan fraksi volume (Bi,Pb)-2223 dari 37% menjadi 68%. Berdasarkan analisis SEM, didapatkan luas porositas pada morfologi permukaan benda uji sebesar 4,742%. Adapun dengan perlakuan sintering berulang menyebabkan terjadinya penurunan luas porositas dari 4,742% menjadi 2,132% hingga 1,589% untuk benda uji sintering 1 kali, 2 kali, dan 3 kali. Bentuk butir juga semakin lebih seragam akibat dari perlakuan sintering berulang yang diberikan pada sampel.

EFFECT OF NICKEL PULSED ELECTRODEPOSITION PARAMETERS ON DEPOSIT MICROSTRUCTURE AND CORROTION RATE AISI 410 Agnes Stephani; Soesaptri Oediyani; Yulinda Lestari; Efendi Mabruri
Widyariset Vol 4, No 2 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Nickel pulse electrodeposition is one of the coating methods that used to increase the corrosion resistance and improve the mechanical properties. In this study, nickel was used as the anode and martensitic stainless steel 410 was used as the cathode. The solution used in the method of nickel pulse electrodeposition include nickel sulfate, nickel chloride, and boric acid. Pulse electrodeposition parameters are variation of duty cycle of 70, 80, 90% and frequency variations valued at 0.1, 1, 10, and 20 kHz. Temperatures used in research nickel pulse electrodeposition at 50 ° C, with a current density of 15 A / dm² and 18 minutes. The Scanning Electron Microscopy analysis determine the microstructure and grain size changes after a nickel pulse electrodeposition. The polarization test determine optimum rate of corrosion when 90 % duty cycle and 20 kHz frequency.

SIZE DISTRIBUTION AND CONDITION FACTOR OF SPINY LOBSTER (Panulirus homarus Linnaeus 1758) IN PANANJUNG PANGANDARAN Arip Rahman; Dimas Angga Hedianto; Danu Wijaya
Widyariset Vol 4, No 2 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Perairan Pangandaran merupakan salah satu wilayah penyebaran lobster yang potensial di bagian Selatan Jawa Barat. Jenis lobster yang tertangkap di Perairan Pangandaran antara lain: lobster pasir (Panulirus homarus), lobster batu (P. penicillatus), lobster mutiara (P. ornatus) dan lobster bambu (P. versicolor). Pengukuran lobster dilakukan pada bulan November-Desember 2015 dan Januari-Februari 2016 untuk mengetahui sebaran ukuran populasi dan faktor kondisi lobster pasir. Hasil pengukuran 826 ekor lobster pasir, menunjukan sebaran ukuran lobster pasir jantan berkisar antara 3,1 – 8,9 cm (CL) sedangkan ukuran lobster betina berkisar antara 3,4 – 8,5 cm (CL). Hasil analisis hubungan panjang bobot, lobster pasir di Pangandaran memiliki pola pertumbuhan isometrik. Nilai koefisien kondisi fulton (K) dan berat relatif (Wr) hasil analisis, mengindikasikan bahwa kondisi perairan Pangandaran kurang mendukung untuk pertumbuhan lobster.

EFFECT OF HEAT TREATMENT TEMPERATURE ON MICROSTRUCTURE CHARACTERISTIC AND HARDNESS PROPERTIES OF CASTED Ti-6Al-4V ELI Damisih Damisih; I Nyoman Jujur; Joni Sah; Djoko Hadi Prajitno
Widyariset Vol 4, No 2 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Ti-6Al-4V Extra Low Interstitial (ELI) alloys have been widely used for biomedical application as implant materials due to its excellent mechanical properties and good corrosion resistance. Furthermore, mechanical properties of this alloy could be improved by heat treatment process. In this research, it has been studied the effect of heat treatment temperature on microstructure and hardness properties of casted Ti-6Al-4V ELI alloy. After calculation of material balance to obtain this alloy composition, raw materials were melted using single arc melting furnace flowed with argon gas and melted alloy was casted. Then, it was heat treated by solution treatment for around 1 hour and subsequently quenched in water as medium. Solution temperature was given with temperature variables of 850oC, 950oC and 1050oC. After that, it was aged at temperature of 500oC for 4 hours. Microstructures were observed using optical microscope and hardness value were obtained by Vickers hardness method. The results of microstructure observation showed that it was changed after heat treatment process, especially on morphology of α and β phase. Thus, the hardness of alloy significantly increased compared with as-cast condition after heat treatment process. The optimum value of hardness was obtained at temperature of 850oC that was 478 HVN.

HUBUNGAN ANTARA NERACA AIR LAHAN TERHADAP PRODUKSI KARET KLON BPM24 Sahuri Sahuri; Andi Nur Cahyo
Widyariset Vol 4, No 2 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Secara umum produksi karet dipengaruhi oleh fluktuasi curah hujan setiap bulan. Penelitian bertujuan mengetahui pengaruh curah hujan, evapotranspirasi, dan ketersediaan air lahan terhadap produksi karet klon BPM 24. Penelitian ini dilaksanakan di Kebun Percobaan Balai Penelitian Sembawa, Sumatera Selatan dari tahun 2013 – 2015. Plot penelitian yang digunakan adalah tanaman menghasilkan klon BPM 24 tahun tanam 2002 berumur 14 tahun dengan tekstur tanah clay loam. Penelitian ini dilakukan dengan cara membandingkan produksi tanaman karet pada saat musim hujan dan musim kemarau dari tahun 2013-2015. Hasil penelitian menunjukkan bahwa kadar air tanah merupakan parameter yang paling berpengaruh terhadap hasil lateks tanaman karet klon BPM 24 dibandingkan dengan parameter curah hujan dan evapotranspirasi. Hasil lateks menurun dengan berkurangnya kandungan air tanah pada periode bulan kering. Kurangnya air pada bulan kering menjadi faktor pembatas untuk hasil karet yang optimal. Ketika kadar air tanah turun hingga di bawah 100 mm, hasil lateks maksimal yang dapat dicapai oleh tanaman karet adalah sebesar 20 g/p/s.

POTENSI ENERGI LAMUN UNTUK MENDUKUNG PELESTARIAN DUGONG (DUGONG DUGON) DI DESA BERAKIT DAN DESA PENGUDANG PULAU BINTAN Nurul Dhewani Mirah Sjafrie
Widyariset Vol 4, No 2 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Dugong dugon is belong of the Order Sirinedae, family Dugonidae, known as a seagrass specialist and been categorized into endangerd species. In Bintan Island, these animals are found in the North season (December to February). This study aims to determine the potential of seagrass energy as dugong food which appeared in the Berakit and Pengudang village. Collecting of seagrass biomass was conducted in May 2015. A total of 40 transects squares measuring 1 x 1 meter used to take seagrass biomass. Seagrass energy is obtained by converting biomass into energy units. The result shows that seagrass energy in the Berakit village are 1.04 x 1012 Joule or can feed 51,000 – 88,000 dugong, whereas the Pengudang village are 6.64 x 1011 Joule or can feed 32,000 – 55,000 dugong. The potential seagrass derived from Halodule uninervis in Pengudang village can feed 589 - 1000 dugong. The seagrass in both of villages have great potential for dugong feed but the anthropogenic disturbances should be considered. It is suggested that seagrass on the eastern coast of Bintan Island need to be managed seriously.

ABSTRAK INGGRIS admin jurnal
Widyariset Vol 4, No 2 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

DIVERSITY, COMPOSITION AND UTILIZATION OF MOLLUSC IN SAPARUA ISLAND, CENTER MOLUCCA Muhamad Masrur Islami; Idha Yulia Ikhsani; Terry Indrabudi; Iskandar A.H. Pelupessy
Widyariset Vol 4, No 2 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Saparua Island is one of the islands in the Central Moluccas that has a complete ecosystem, unfortunately records on mollusk research is very limited. The aim of this research is to know the composition, diversity and utilization of mollusk. The objectives of the study are to determine the composition, diversity and utilization of mollusks using square transect and free collection method which conducted on April and September 2016. Water analysis is also done to determine the environmental hydrographic condition. Temperature and salinity indicate the presence of freshwater input through rivers, especially in St-2 2 (Waisisil). Concentrations of nutrients show a fairly high value, ranging from 0.001 to 0.114 mg L-1 for phosphate; 0.012 - 0.023 mg L -1 for nitrate and 0.140 - 0.443 mg L -1 for silicate. There are 641 individual mollusks of 107 species consisting of 85 species of Gastropoda and 22 species of Bivalves. Species found mostly by Littoraria scabra (Littorinidae), Cypraea annulus (Cypreidae), Terebralia sulcata (Potamididae); Clypeomorus battilariaeformis (Cerithiidae); and Nerita chamaeleon (Neritidae). The existing mollusk community has moderate and uniform diversity with low species dominance. There are at least 35 species of mollusks that can be utilized into various commodities such as food products, accessories/decorations and raw materials of drugs.

DARI PACHT PASAR KE PASARFONDS: PASAR PONTIANAK DALAM KEBIJAKAN EKONOMI KOLONIAL BARU PADA AWAL ABAD XX Dana Listiana
Widyariset Vol 17, No 1 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

This research discusses about Pasar Pontianak in the changing of management system during colonial time. The purpose of this research is to analyze the background for deleting pacht pasar in 1919 and the effect after being directly handled by the local government through pasarfonds. To do the research, historical research method was used. The result of this research shows that the changing in the system was caused by the increasing number of workers and colonial government’s worries of the new political power based upon the economic strength of Tionghoa society as a main drive to trading in market. Meanwhile, the new colonial economic policy had triggered the growth in the market-forming elements, which were; the management system, places, trading subjects, com- modities, and trading activities.

TEKNIK PENGEMASAN DALAM TRANSPORTASI UNTUK MEMPERTAHANKAN MUTU BUNGA POTONG ALPINIA (Alpinia purpurata) Tri Marsetyowati
Widyariset Vol 17, No 2 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

Alpinia purpurata flower is one type of cut flower with great opportunity as an exported flower for its attrac- tive shapes and colors. In order to gain maximum benefit from cut flowers as ornaments, post-harvest treatments require attention. One of those treatments is packing which aims to maintain the quality of cut flowers during transport or shipping. The objectives of this study were to determine the type of primary packaging material and the most suitable placement inside the packaging during transport in order to conserve the quality. Factorial Completely Randomized Design with 3 replications was used. To find out the effects of the treatments, analysis of variance was done using F-test. Difference among treatments was tested using LSD at 5% significance level. The results showed that the use of PP plastic as packaging material gave a significant difference on weight loss, flowers’ freshness during transport, freshness period during demonstration time and the amount of holding solution absorbed. Packaging technique with plastic as the packaging material gave the best result with longer freshness period (7.77 days), flowers had the lowest weight loss (0.71%), the flowers seemed quite fresh (score of 4) and were able to absorb more holding solution (4.81ml/stalk/day) during demonstration time and therefore they remained in fresh condition. One-way orientation of placement was the best treatment at weight loss (0.77%) and the amount of holding solution absorbed (5.04ml/stalk/day).

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Pusbindiklat Peneliti-LIPI (The National Training and Education Center for Researchers Development – Indonesian Institutes of Sciences) Jl. Raya Bogor Km. 46, Cibinong Science Center Cibinong - Bogor 16911

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Kota adm. jakarta selatan,

Dki jakarta

INDONESIA