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Published by Pusbindiklat Peneliti LIPI

ISSN : - EISSN : 24610976 DOI : 10.14203

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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HAZARDOUS WASTE IMPORT BAN POLICY AND PROBLEMS Teddy Prasetiawan
Widyariset Vol 15, No 1 (2012): Widyariset
Publisher : Pusbindiklat - LIPI

Transboundary movements of hazardous waste become a hot topic nowadays. Its characteristics that areharmful to humans and the environment make this type of waste is rejected by all countries anywhere in the world,including Indonesia. This paper will explain briefly about the definition of hazardous waste, the background ofhazardous waste import ban policy, and problems in the implementation of the policy. This study applies qualitativeand descriptive method by using secondary data. There is a tendency by the developed industrial countriesfor making the poor and the developing countries as “a giant trash can” for the hazardous waste they produced.So far, Basel Convention which was organized in order to address these concerns by establishing a ban of transboundarymovements of hazardous waste, has not been able to produce a binding agreement for all countries.Indonesia, which implements hazardous waste import ban policy, not only needs to harmonize all the rules relatedto hazardous waste management, but also needs to improve the supervision of illegal traffic of hazardous waste.

WASTEWATER SPECIFIC EMISSION FACTOR FROM COMMUNAL WASTEWATER TREATMENT PLANT (WWTP) Reni Nuraeni; Amallia Ashuri
Widyariset Vol 4, No 1 (2018): Widyariset
Publisher : Pusbindiklat - LIPI

Greenhouse gasses (GHG) that produced by anaerobic digestion of wastewater consists of CH4 gas and NO2 gas. Beside the data of specific activity, the specific emission factor also plays important part to determinate GHG emission. The aim of this paper is to know specific emission factor value from communal wastewater treatment plant (WWTP), as an input to determinate GHG emission for determination of GHG emission reduction rate. The data was collected by taking sample of BOD, CH4 gas, and CO2 gas from communal WWTPs. Sampling location were communal WWTPs in Jakarta City, Bandung City, and Yogyakarta City. Those WWTPs using anaerobic baffle reactor as their treatment system with capacity varied between 40-200 EP. The parameters were BOD and CH4 that measured using grab sampling in the morning and evening. Data analyzed by quantitative methods. The specific emission factor value was determined from CH4 gas measurement which affected by wastewater treatment unit dimension, gas catcher chamber, and air suction pump capacity. The analysis results showed specific emission factor for communal WWTPs from the three cities is 0.00171 kg CH4/kg BOD. The value has bid difference when compared to IPCC’s default that is 0.48 kg CH4/kg BOD. This is due to the formation of CH4 gas and CO2 gas was strongly influenced by environmental condition in real time condition. This factor is not taken into consideration in IPCC’s default.

TANGGAP PERTUMBUHAN TANAMAN GANDUM TERHADAP NAUNGAN Gagad Restu Pratiwi
Widyariset Vol 13, No 2 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

The aim of this research was to study the effects of shading intensity on growth of wheat. The research was designed with two factorials as a split plot. The first factor was the shading intensity and the second factor was thetime of shading. In addition, there was one treatment of without shading. The obtained data were analyzed by using the variance analysis and for the significant analysis treatment was contrast orthogonal and Duncan’s MultipleRange Test at the level significant 5%. The results showed that the shading treatment caused changes in micro environment around the crop. The 50% shading increased the vegetative phase of crop. In addition, the increasingintensity of shading also decreased rate transpiration, the number of fertile tiller per hill, and the number of spikes per square meter.

THE EFFECT OF MARKETING MIX AND WEBQUAL ON SITE’S CREDIBILITY Rachmat Agustian; Ujang Sumarwan; Rita Nurmalina
Widyariset Vol 18, No 1 (2015): Widyariset
Publisher : Pusbindiklat - LIPI

In the practice of e-Commerce, another word for online-based sales activity conducted by firms or organizations via the internet, the credibility of the host site is important. A credible site will be able to attract more visitors, thus increasing the probability of selling the goods or services offered in that particular site. Credibility assessment is not only based on the usability, information quality, and interaction quality of the site alone, but is also based onattributes of marketing mix, which include the originality of the product, the promotion that is currently available, the existence of additional information in the site, as well as other factors. This research aims to link the attributesof marketing mix and site quality assessment (WebQual), such as the usability, information quality, and interaction quality to the credibility of a site. The research models the relation by constructing a structural equation modeling(SEM) and uses two data analyzing techniques: descriptive analysis using cross tabulation and frequency table, and a variance based model analysis using the Partial Least Square (PLS) method. The results show that site credibility assessment on marketing mix improves due to occurring bonus or promotions, selling well known brands, and the availability of delivery services that can be monitored by buyers. In WebQual metrics, site credibility improves due to visitor’s ease of understanding, trust/reliability, and security while visiting or conducting purchases. Site credibility constructions rely on additional vendor information such as contact numbers, vendor ID (address, structure, awards, etc.), shopping guidelines, and feedback speed to customers queries.

DIVERSITY OF ENDOPHYTIC BACTERIA ASSOCIATED WITH (Curcuma heyneana) AND THEIR POTENCY FOR NITROGEN FIXATION Tri Ratna Sulistiyani; Puspita Lisdiyanti
Widyariset Vol 2, No 2 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

Endophytic bacteria shows a high biodiversity and some of the species plays important biological roles in agriculture. The aim of this study was to investigate the endophytic bacteria diversity associated with temu giring (Curcuma heyneana) and to evaluate its nitrogen-fixation activity. Temu giring was collected from Bogor Botanic Garden. The isolation of endophytic bacteria was carried out using two methods (spread plate and plant piece methods) and four different medias (Nutrient Agar (NA), NA contained temu giring extract (NAH), Water Yeast Extract Agar (WYEA), and WYEA contained temu giring extract (WYEAH)). The identification of selected isolates were conducted based on 16S rDNA. The ability of selected isolates to fix the nitrogen on Jensen’s media is then being tested. The results revealed that the suitable method and media of endophytic bacteria isolation were spread plate method and NA. Based on the morphological characteristics differentiation, 30 isolates were obtained from rhizome (27%), stem (50%), and leaves (23%). The sequencing result of 16S rDNA showed that community of endophytic bacteria was divided into six clusters, those are Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Flavobacteriia, Actinobacteria, and Firmicutes,which represented 17 genus consisted of Microbacterium, Leclercia, Brevundimonas, Chromobacterium, Enterobacter, Acinetobacter, Novosphingobium, Chryseobacterium, Curtobacterium, Agrobacterium, Sphingomonas, Herbaspirillium, Bacillus, Variovorax, Mycobacterium, Starkeya, and Rhizobium. A total of eleven isolates could grow in the N free medium. The presence of endophytic bacteria those were able to fix nitrogen are expected to be applied in agricultural sector as a biological fertilizer.

PENTINGNYA AKREDITASI DALAM PROSES PEMBINAAN MANAJEMEN SEKOLAH/MADRASAH DI SUMATRA UTARA Dyah Suryawati
Widyariset Vol 13, No 1 (2010): Widyariset
Publisher : Pusbindiklat - LIPI

Accreditation is one of the important activities in education and became one of the indicators of accountabilityin education. Quality of education in Indonesia is still left behind and the disparity of school quality in Indonesia isstill high, particularly among school that are on the island of Java and outside Java island. Based on these need tobe inspected the implementation and barriers or obstacle faced in the implementation of the accreditation school/madrasah at these time. This research is expected to improve the quality of the implementation of accreditation sothat the trust stakeholders with the implementation of the accreditation of school/madrasah increase. The approachused in this research is a qualitative approach. Based on the data, the results of accreditation have not been fullyused as basic guidance the school/madrasah by the related institution.

FAKTOR-FAKTOR DETERMINAN DALAM PENETAPAN BESARAN GAJI PEGAWAI PADA PERUSAHAAN SWASTA Janry Haposan U. P. Simanungkalit
Widyariset Vol 12, No 3 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

In determining or establishing workers' salary/wage, one of the main problems faced by company/firm is what factors or components that form to determine salary, notably in private company. The objectives of this study are: (1) to analyze and explain workers' salary conditions in private company now (existing) and (2) to anaylze and explain salary structure that form on private company. This study uses primary data collected from respondents through observation using research instrument based on variables, i.e. dependent variable, namely employ salary per month from main job/work (Y) and 6 (six) independent variables, namely working life (X), gender (X), marital status (X), education level (X), type of job (X), and productivity level of employ N Multiple regression method was used to analyze the data with SPSS version 11.5 software. The results of the study show that working life employ, education level, and type of job are influential significantly to employ salary. Meanwhile gender, marital status, and productivity level of employ are not influential significantly to employ salary.

PHYSICOCHEMICAL AND ORGANOLEPTIC CHARACTERISTICS OF RED GUAVA (Psidium guajava L.) JUICE INSTANT DRINK POW- DER PRODUCED USING FOAM-MAT DRYING METHOD Sandi Darniadi; Iyan Sofyan; Dede Z. Arief
Widyariset Vol 14, No 2 (2011): Widyariset
Publisher : Pusbindiklat - LIPI

Powder product as instant drink from red guava (Psidium guajava L.) juice is more practicable to increase economic value. The objective of the research was to investigate physicochemical and organoleptic characteristics of red guava juice instant drink powder produced using foam-mat drying method. The results showed that red guava juice instant drink powder produced using foam-mat drying method had high yield with solubility was low, the brightness was high, the level of redness was high, the level of yellowish was low, sugar was high, and sensory properties were accepted by panelist.

DEFINE EXTRACTION METHOD TO OBTAIN POSSIBLE HIGHEST CONTENT OF YIELD RECOVERY OF THE RICE VOLATILE COMPOUNDS Zahara Mardiah; Bram Kusbiantoro; Riane Rizky
Widyariset Vol 15, No 2 (2012): Widyariset
Publisher : Pusbindiklat - LIPI

2-Acetyl-1-pyrroline (2-AP) is the most important compound in aromatic rice that correlated with the quality of the aroma, therefore, determination of 2-AP concentration become very important. This research aims to find the extraction method to obtain the highest yield recovery of 2-AP. The materials used were H51 and Segara Anak to treatments test, and Pandan wangi, Sariwangi, Sintanur, and Gilirang for comparison the methods. Analysis using SPME method with three types of sample treatment, i.e. 80 mesh flour, 45 mesh flour, and cooked rice. While the analysis using Likens Nickerson with a different anti-foaming agent (MgSO4 and silicon) and a different ratio of rice and water (1:2 and 1:3). Extract samples were analyzed using Gas Chromatography Mass spectrometry (GCMS). The best results of any treatment will be used in a comparison test between the two extraction methods. The sample type of 45 mesh powder on SPME method (SPME-opt) and silicon as an anti foaming agent as well as rice and water ratio 1:3 on the Likens Nickerson method (Likens Nickerson-opt) is the best treatment in determining the yield recovery of 2 - AP. Comparison test indicated that SPME-opt is better than Likens Nickerson-opt in obtain the yield recovery of 2-AP.

EFEKTIVITAS PEMUTUSAN MULTIWALLED CARBON NANOTUBES (MWNT) DENGAN MENGGUNAKAN HIGH ENERGY MILLING DAN CONVENTIONAL BALL MILLING Nono Darsono
Widyariset Vol 12, No 1 (2009): Widyariset
Publisher : Pusbindiklat - LIPI

The cutting efficiency of MWNTs was compared systematically between conventional ball milling and high-energy milling. The efficiency of both processes was evaluated in term of dispersion properties, aggregates size evolution, and degree of crystallinity. Two-hour high-energy milling produced a large portion of MWNTs smaller than 150 nm, while even 120-hour ball milling struggled to achieve smaller than 300 nm. It was revealed by the significantly viscosity value. Since the high-energy milling viscosity was much higher than ball milling, 2-hours high energy milling exhibited lower damage on the MWNTs thread than the 120-hours ball milling according to the I /I ratio and values of raman spectra were 3.63 and 2.81 for high energy milled and ball milled respectively.

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Contact Name
Andri Rahman

Contact Email
andri.agus.rahman@lipi.go.id

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Journal Mail Official
widyariset@mail.lipi.go.id

Editorial Address
Pusbindiklat LIPI, Jl. Raya Bogor Km. 46, Cibinong Science Center, Cibinong - Bogor 16911

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Kab. bogor,

Jawa barat

INDONESIA