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Widyariset
Published by Pusbindiklat Peneliti LIPI
ISSN : -     EISSN : 24610976     DOI : 10.14203
Core Subject : Science, Engineering,
Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Neuroscience Physics
Widyariset is a scientific journal which publishes the results of research and development, assessment, and systematic thinking about Natural Science.
Arjuna Subject : Umum - Umum
Articles 476 Documents
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THE EFFECT OF ORGANIC MATTER AND PLANTING TIME IN INTERCROPPING SYSTEM OF PEANUT AND MAIZE Sarjoni Sarjoni
Widyariset Vol 16, No 3 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.16.3.2013.457-466

Abstract

Intercropping system is a double cropping, involving the growing of two or more crops sequentially or delaying of growing period of a crop. Effect of intercrop competition on the utilization of solar radiation, water, mineral nutrients, and space to grow can cause yield losses. This study was aimed to evaluate the effect of organic matter and planting time in intercropping system of peanut and maize on growth and yield. The research was carried out at the Experimental Farm of Haluoleo University in 2008 and was laid out in a Split Plot Design with three replications. The treatment consisted of two factors, organic matter as main plot and planting time as subplot. Results showed that interaction between organic matter and planting time had significant effect on seed number of maize, pod number of peanut , weight of 100 seeds of peanut, and yield and harvest index of maize and peanut.
MANAJEMEN KONSERVASI ENERGI LISTRIK MELALUI PENDEKATAN FINANCIAL ASSESSMENT PADA PT XYZ Ajen Mukarom; Abdul Kohar Irwanto; Armansyah H. Tambunan
Widyariset Vol 17, No 1 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.17.1.2014.71-82

Abstract

ThisresearchdiscussestheimplementationofelectricalenergyconservationmanagementatPT XYZ.The method used in this research utilizes measurement, survey, and interview. The data analysis includes descriptive analysis,EnergyConsumptionIntensity(IKE)measurement,identification ofenergysavingopportunities,and financialassessmentanalysisapproach.Theresultsofthisresearchshowthattheusagelevelandelectricalenergy costandIKEvalueon  PTXYZduring2012fluctuatedbuttheytendtodecline,theelectricityqualityofcosphi, electrical current unbalance, electrical frequency, voltage and current harmonic are still quite good.  However, the maximum value of electrical current unbalance exceeds the standard value, mainly in TR2/AC. Based on the observationandmeasurementontheOverallThermalTransferValue,ventilatingandairconditioning,andbuild- ing illumination areal system are suitable to the Indonesia National Standards (SNI). However, there are several ways to achieve the electrical energy conservation in ventilating and air conditioning, and lighting systems.MANAJEMEN KONSERVASI ENERGI LISTRIK MELALUI PENDEKATAN FINANCIALASSESSMENT PADAPTXYZ
LENGTH DISTRIBUTION AND SEX RATIO TO INVESTIGATE SPAWN ELIGIBILITY OF BIGEYE TUNA(THUNNUS OBESUS LOWE, 1839) IN THE INDIAN OCEAN Arief Wujdi; Fathur Rochman; Irwan Jatmiko
Widyariset Vol 2, No 1 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.2.1.2016.67-76

Abstract

Bigeye tuna (Thunnus obesus Lowe, 1839) is the important commodity for the fishing industry in Indonesia. Increased exploitation is threatening their population, so that is necessary to monitor the size composition that meets the eligibility to be captured, as well as the sex ratio as a management measure. Data was collected by scientific observers program which was following commercial tuna longline operation mainly based in Benoa, Palabuhanratu and Bungus Fishing Port from August 2005 to December 2014. Chi-Square analysis with 95% of confidence level also implemented to determine the sex ratio of female and male. The result showed that BET caught ranged from 30 to 192 cm, mode size ranged from 121 to 125 cm and mean 111,76 cm. As much as 69,5% of them was greater than a length at first maturity (Lm) and that means have been worthy to be captured. The sex ratio of (F:M) 1:1,32 was observed which indicates male was  dominant  than  female.  Correlation  between  sex  ratio  and  length proved to be significant where the female was increasing in size between 95-145 cm, as described a regression equation. However, an equal sex ratio occurred during December to January and also from April to June along the southern part of Java and East Nusa Tenggara and western part of Australia waters.
EFFECTIVENESS OF COMPOST EXTRACT INDUCING SYSTEMIC RESISTANCE IN CIGAR TOBACCO PLANT AGAINST Cucumber Mosaic Virus (CMV) Abdullah Umar; Wiwiek Sri Wahyuni
Widyariset Vol 16, No 2 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.16.2.2013.309-318

Abstract

Tobacco is a highly valuable commodity and Cucumber mmosaic vvirus (CMV) is an economically important disease. This study was aimed to determine the effectiveness of compost extract inducing systemic resistance in cigar tobacco against CMV. The experiment was arranged in a randomized block design (RBD) with two factors (5/K x2/V). K factor consisted of five types of three kinds of compost extract, Pseudomonas putida and control, while factor V consisted of 2 types of with or without virus inoculation. Each treatment was repeated 5 times. Its effectiveness was assessed by observing severity of the disease at 24, 27, 31, 36, 40, and 44 days after virus inoculation. The result showed that application of compost extract or P. putida Pf-20 on 15 days before inoculation of CMV could induce the systemic resistance of cigar tobacco and extended to the period of incubation up to 22 days. Rice straw compost extract was more effective than leaf litter compost extract or coffee husks. However, the indication effectiveness of those three extract were lower than P. putida. 
STUDI KARAKTERISTIK STOMATA BEBERAPA JENIS TANAMAN REVEGETASI DI LAHAN PASCAPENAMBANGAN TIMAH DI BANGKA Lina Juairiah
Widyariset Vol 17, No 2 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.17.2.2014.213-217

Abstract

Study on stomatal characteristics of some reclamation plants in the post tin-mining land in Bangka was conducted based on Wholemount method. According to the classification of stomata density, Trema orientalis, Commersonia bartramia, and Syzygium garcinifolium were belong to high density category (> 500/mm2), while stomatal density V. pinnata was in the category of medium density (300-500/mm2). The average length of stomata T. orientalis, V. pinnata, and S. garcinifolium include length size (20-25 µm) criteria, while C. bartramia include long enough size (< 20 µm). Based on characteristics that the four types of stomata plants show V. pinnata grown more adaptive of post tin -mining land in Bangka compared with T.orientalis,C. bartramia, and S. garcinifolium.
STUDY AND DISTRIBUTION IN OIL PORTS SHALLOWING SEDIMENTS (OIL WHARVES) PT CALTEX PACIFIC INDONESIA DUMAI, RIAU 1990 POST-DREDGING Hendra Yusran Siry
Widyariset Vol 14, No 3 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.14.3.2011.643-650

Abstract

To study the process of rapid sedimentation occurred required an understanding of the characteristics of the sediments and oceanographic processes. This paper is to analyse source of silting up and sediment distribution surrounding oil wharves of PT Caltex Pacifi  c Indonesia (PT CPI) after big dredging in 1990 during four months research and intensive survey in 18 research sampling areas. The research used gravimetric method for sediment samples identifi  cation and fi  eld survey for oceanographic conditions twice sampling time, fl  ood tide and ebb fl  ood. Data showed sediment fraction consist of sandy mud with 48.175–74.735% mud content. Classifi  cation and result of sediment statistic analysis indicated wave energy and tide caused silting-up process in the surrounding PT CPI’s oil wharves. This process was sped up by the environmental conditions, reclamation and coastal land changes.
DEVELOPMENT PROGRAM FOR CALCULATION OF MATERIAL DIFFUSION COEFFICIENT IN SURFACE ENGINEERING Jan Setiawan
Widyariset Vol 15, No 3 (2012): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.15.3.2012.551–556

Abstract

A program to calculate the diffusion coefficient and predicting the depth, time and temperature of diffusionhas been developed. It is shown that the calculation result is in good agreement with the known conventionalone. The program has been developed using Visual Basic based on the Fick’s II law and the diffusion coefficientequation as an exponential function of temperature. It is argued that the program could improve the accuracy ofthe calculation of diffusion coefficient, depth, time and temperature which are important to improve the diffusionprocess efficiency.
STUDY ON GIANT CLAMS (CARDIIDAE) POPULATION IN KEI KECIL WATERS, SOUTHEAST-MALUKU Udhi Eko Hernawan
Widyariset Vol 13, No 3 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.13.3.2010.101–108

Abstract

Penelitian ini dilakukan untuk mengetahui komposisi dan kepadatan jenis, distribusi ukuran, serta kondisi habitat kima pada sembilan lokasi, yaitu Pulau Ohoimas, Dullah, Naam, Laguna Hoat, Warhu, Pasir Panjang,Ohoidertawun, Teluk Un, dan Tandusan, di perairan Kei Kecil. Pengambilan data dilakukan dengan menggunakan metode kuadrat-transek. Penilaian kondisi habitat mengacu pada tipe substrat yang berdasarkan kode bentik (benthic code). Hasil penelitian menunjukkan bahwa di perairan Kei Kecil terdapat enam jenis kima, yaitu T. crocea, T. squamosa, T. maxima, T. derasa, T. gigas, dan Hippopus hippopus. Secara keseluruhan kepadatan individu kima di Kei Kecil termasuk sangat rendah. Kima T. crocea adalah jenis yang paling dominan, sedangkan T. derasa dan T. gigas adalah jenis yang paling sedikit ditemukan. Berdasarkan distribusi panjang cangkang, individu yang berada pada fase juvenile jumlahnya lebih sedikit dibandingkan jumlah individu fase remaja dan dewasa. Habitat yang paling bagus di perairan Kei Kecil adalah Ohoimas dengan variasi substratnya dan kekayaan jenis yang tertinggi. Rekomendasi yang diberikan bagi pemerintah lokal dan masyarakat adalah pembentukan daerah konservasi kima melalui pelaksanaan tradisi sasi.
SUSTAIBILITY OF TURTLE HARVESTING Cuora amboinensis DAUDIN 1802 (TESTUDINES: GEOMYDIDAE) IN EXPLOITED AREA, EAST BORNEO Nuryani Widagti
Widyariset Vol 14, No 2 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.14.2.2011.367-374

Abstract

Research on harvesting of a freshwater turtle (Cuora amboinensis) in Kota Bangun Sub district was conducted in June till August 2006. The research aims to estimate the number of harvesting, to describe trading mechanism, and to make Non-Detriment Finding (NDF) of C. amboinensis in Kota Bangun Sub district. Method used was harvest survey and interview. During the study, a total of 1,388 individuals were collected, comprising 46.97% adult females, 48.7% adult males, and 4.32% juveniles. It indicated that larger individuals of C. amboinensis are preferably collected for trade in study site. Base on the number of middlemen, the average of harvest-yield in Kota Bangun Sub district and its surroundings are about 622 individuals/month. There are four levels of trade structure in Kota Bangun Sub district, i.e trappers, collectors, middlemen, and exporter.
A STUDY ON APPLICATION ZINC OXIDE (ZNO) NANOPARTICLES AS SECURITY INK FOR VALUABLE DOCUMENTS Widhya Budiawan; Mikrajuddin Abdullah; Khairurrijal Khairurrijal
Widyariset Vol 15, No 2 (2012): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.15.2.2012.257–264

Abstract

Ink made from zinc oxide (ZnO) nanoparticles colloid has been synthesized by using a sol-gel method. Employing an XRD, it was obtained that the sizes of particles were around 3–4 nm. Utilizing a UV-Vis spectrometer, it was found that the band gap energies were 3.5 and 3.45 eV for the sizes of 3 and 4 nm, respectively. For the purpose of testing the ink effectiveness, the ZnO colloid was mixed with polyethylene glycol (PEG) 400 or glycerine. Using pure ZnO colloid as printer ink, invisible characters under natural illumination had been successfully printed on specific papers. Under ultraviolet (UV) illumination, the invisible characters became visible. The developed ink, therefore, has potential applications for security of bank notes or passbooks.

Page 35 of 48 | Total Record : 476

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