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Jurnal Penelitian Saintek

saintek
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Published by Universitas Negeri Yogyakarta

ISSN : 14123991 EISSN : 25287036 DOI : 10.21831

Core Subject : Science,

Decision Sciences, Operations Research & Management

Arjuna Subject : -

Articles 286 Documents

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MODIFICATION OF TRIGGER SYSTEMS ON THIRD POWER ELECTRICAL CONTROL OF MEDANG VEDC PHASE Haryanto Haryanto; Sunomo Sunomo
Jurnal Penelitian Saintek Vol 11, No 1: April 2006
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

AbstractThe fault of the pulse transformer and the TCA 785 triggering systems in themodule of Power Electronics made by VEDC Malang make it difficult tosubstitute due to the high prices and unavailability in Yogyakarta market.The purpose qf this application research is to substitute of TCA 785 with twooutputs by two pieces of NE 555 which work in the same manner, and tosubstitute ofpulse transformer for SCR and TRIAC phase control (firing) withoptocoupler MDC 302/ in module 501 for laboratorium practicum: Themodification is needed because of unavailability of the two components and theprice. For three phase control, the system need three pieces of both TCA 785 '.I'and pulse transformers. So, the substitution needs six pieces of both NE 555 '.I'and MOC302I '.1'. Using of optocouplerfor coupling offiring the SCR '/TRlAC '.I'is to avoid induction voltage from the main to the controlling part system whenthere is afault or short circuit in the main system.This experiment applied to the SCR firing of 0"-180" phase control and to theTRIAC of U' -180" and 180" -360" phase control. in this action. the performanceofthe NE555's and the MDC 3021 '.I' must be the same of the TCA 785 and thepulse transformer.The result shows that without the compensation circuit of main networksynchronization, NE 555 's have good performance for SCR half wave phasecontrol. For TRIAC phase control, the control of positive and negative cycledone in serial manner, not in the same period, the first action is/rom (/' to 180",and then followed from 180" to 360". With the compensation circuit of mainnetwork synchronization, the behavior offiring 111 phase control has the same manner with TCA 785 but notforfiring of 0"-45" The cause is comingfrom the fact that the firing signalfrom the of NE 555 is done by the rear of the output pulses. and the histeresis of serial synchronization system for NE 555 triggering To improve the performance, new design of main network synchronization is needed, that work in the leading scheme of zero crossing.

DESIGN AND IMPLEMENTATION OF E-COMMERCE SYSTEM WITH TECHNOLOGY FRAMEWORK ORIENTED OBJECT Herman Dwi Surjono
Jurnal Penelitian Saintek Vol 7, No 2: Oktober 2002
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The purpose of this' research was to design and to implement an ecommerce (electronic commerce) system using components and objectoriented frameworks technology. The research begins with analyzing and identifying specifications, which are categorized functionally into modules and objects. The objects are grouped into three logical categories: presentation aspects, business rules and data, and objects that accept and interpret user requests and control the business objects. The result is an e-commerce system running on local server of J2EE with URL http://localhost:8000/rbi/.Byaccessingthesystem,itis assumed that the performance would be in line with the expected research goals. The important web pages of the system among others are main page, product category, product item list, detail item description, shopping cart, log-in and log-out page, order notes, and other supporting pages. This e-commerce system was designed to be adapted to other products easily.

MECHANISM OF LANTANUM METAL TRANSPORT IN MEMBRAN LIQUID WITH CARRIER SENYA WA MACROSIKLIS Suyanta Suyanta
Jurnal Penelitian Saintek Vol 8, No 2: Oktober 2003
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The transport mechanism of lanthanum element in the supported liquidmembrane with macrocycle compound Di benzo IB crowns 6 carriers was studied. These transport are two kinds. that is chemical transport and potential transport. The chemical transport is done with two cell compartment (feed compartment and stripping compartment). and separate with membrane that prepare with DiBenzoIBCrown6. Poly Vinyl Chloride. Di Octyl Ptalate, Sodium tetra butyl borate in Tetra hydro furan solution. A 150 mL solution of La3+ JO-3 Min feed cell stirrer with300 rpm speed along 3 hour. The stripping phase is solution that varied the pH from 1 to B. The same way. then solution in the feed cell is varied from 10-1 M to 5.10-4 M. The potential transport is measured with the relative same cell. The potential transport measure with two kind reference electrode. Ag/AgCI reference electrode in the inner cell and calomel reference electrode in the outer cell. Inner cell is contain mixture solution KCL 10-3 M and La3+ IO-3 M and outer cell is contain solution La3" that variedfrom 10-8 to JO-J M. The chemical transport is effective at low pH (below pH 4) and high pH (upper pH 6). It is good way for separation of La3'. The transport ion La3+ is low at pH 4 - 6. It is good areafor applied as sensor membrane electrode that has minimal diffusion potential. The system has good correlation in potential membrane that gives slope value 19.36 as Nernst coefficient.

Cr-Fe KOADSORPSI BY KITOSAN Endang Widjajanti; AK Prodjosantoso
Jurnal Penelitian Saintek Vol 13, No 1: April 2008
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study aims to determine the ability of adsorption of chitosan on Cr (III) and Fe (III) ions simultaneously in various concentration variations. As research subject is chitosan isolated from crab shells and made through three stages namely deproteination stage, demineralisasi and deasetilasi. As the object of research is the adsorption power of chitosan against Cr (III) and Fe (III) metal ions, both for each ion and simultaneously. The adsorption process using a batch system is carried out for 24 hours at room temperature under optimum pH system conditions with a 1: 100 (w / v) adsorbent ratio at concentrations of 100 ppm to 1000 ppm. Chitosan adsorption is the ratio between the amount of metal ions adsorbed per gram of chitosan, adsorbat concentration is determined using Atomic Absorption Spectrophotometer The results showed that the adsorption capacity of chitosan on Fe (III) was stronger than Cr (III) in both single adsorption and simultaneous adsorption, and the process was classified as coadsorption.

POTENTIOMETRIC BASED LEAD SENSOR TO DETECT THE LEVELS OF LEAD IN BLOOD Eka Novitasari; Ayu Rahayu Anggraeni; - Muhiroh; Mokhammad W. Dahlan; Ani Mulyasuryani
Jurnal Penelitian Saintek Vol 21, No 1: April 2016
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study was aimed at determining the optimal conditions of lead sensor in the development of ion lead sensor to perform the optimization of several parameters such as the number of ionophores and membrane thickness. In this study, a lead sensor based on lead selective electrode was developed. The electrode was modiﬁ ed by adding lead sulﬁ de in chitosan membran as an active agent (ionophores) and superimposed on the surface of SPCE. The amounts of PbS added in chitosan solution were 0.5%, 1%, 1.5%, 2%, and 2.5% (w/v). The thickness of membrane used were 15 µm, 20 µm, 45 µm, and 75 µm. The sensors were tested in standard solution at concentration 10 -8 M to 10 M and at pH 2, 3, 4, and 5. Lead sensor has optimum performance on PbS 1.5%, thickness of membrane on 15 µm and pH 4. The Nernst factor obtained was 23.45 mV/decade with the solution concentration range 0.032 ppm to 0.322 ppm.-1

ANTIPLASMODIAL ACTIVITY OF METHANOL EXTRACT HERBAL DRUG PLANTS IN VIVO Sri Atun; Retno Arianingrum
Jurnal Penelitian Saintek Vol 17, No 1: April 2012
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Tujuan dari penelitian ini adalah untuk mengetahui aktivitas antiplasmodial dari ekstrak metanol tiga jenis spesies tumbuhan, yaitu pegagan, meniran, dan pulai. Metode penelitian yang akan dilakukan adalah dengan melakukan eksperimen di laboratorium, yang di awali dengan pemilihan dan pengumpulan tiga jenis sampel tumbuhan serta dilakukan determinasi di laboratorium Biologi UGM. Selanjutnya dari berbagai jaringan tumbuhan yang biasa digunakan untuk pengobatan, seperti pegagan (semua bagian tumbuhan), meniran (semua bagian tumbuhan), dan pulai (kulit batang), dilakukan ekstraksi secara maserasi dengan pelarut metanol. Ekstrak metanol dari masing-masing spesies tumbuhan dikeringkan dan digunakan untuk uji aktivitas biologi sebagai antiplasmodial secara in vivo. Uji aktivitas antiplasmodial secara in vivo dilakukan dengan cara 4 days suppressive test pada mencit Swiss yang diinfeksi P. berghei. Mencit dibagi menjadi kelompok kontrol (tanpa bahan uji) dan kelompok perlakuan masing-masing menggunakan 5 ekor mencit. Jumlah kelompok perlakuan 5 (lima) sesuai dengan peringkat dosis ekstrak yang digunakan, yaitu 37,25; 62,5;125; 250; dan 500 mg/BB. Hasil penelitian uji aktivitas antiplasmodial secara in vivo ekstrak metanol kulit batang pulai menunjukkan nilai efektivitas dosis (ED50) sebesar 29,78 mg/BB yang termasuk dalam kategori sangat baik, sedangkan aktivitas antiplasmodial dari ekstrak pegagan dan meniran masing-masing dengan ED50 sebesar 970,29 dan 1018,59 mg/BB, sehingga termasuk dalam kelompok tidak aktif. Kata kunci: pegagan (Centella asiatica), meniran (Phyllanthus niruri); pulai (Alstonia scholaris), antiplasmodial (antimalaria)

ANTIBACTERIAL ACTIVITY TEST OF ETHANOL EXTRACT TEMU KUNCI (Boesenbergia pandurata) AGAINST Streptococcus mutans BACTERIA Fitri Lestari Mahmudah; Sri Atun
Jurnal Penelitian Saintek Vol 22, No 1: April 2017
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The purpose of this study was determined the antibacterial activity on ethanol extract of temukunci (Boesenbergia pandurata Roxb) against Streptococcus mutans bacteria. The subject of this research was the ethanol extract of temukunci. The object of this study was the antibacterial activity of the ethanol extract of temukunci. The research method was disk difussion method by Kirby-Bauer test. The positive control that used was chloramphenicol. The concentration variations were 0.5 sampai 500 µg/ml. The results show that the ethanol extract of temukunci can inhibit the growth of Streptococcus mutans bacteria. Maximum concentration that can inhibit the growth of Streptococcus mutans bacteria is at concentration 50 µg/ml.

APPLICATION OF E-LEARNING ADAPT TECHNOLOGY IF TO OVERCOME LEARNING DESIGNS Herman Dwi Surjono
Jurnal Penelitian Saintek Vol 18, No 1: April 2013
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study aims to design and implement adaptive e-learning technology to address the diversity of student learning styles. This system is expected to overcome the problems of conventional e-learning that gives the same material to each user. This research uses the R D approach. The research procedure includes: (a) analysis, (b) design, (c) implementation, and (d) evaluation. Analysis of consistency and accuracy of the contents carried out on the data at the stage of analysis and design. Descriptive analysis is performed on all data that can be tabulated so that meaningful. The result of this research is adaptive e-learning model to the diversity of student learning style. In the development process is generated also documentation needs description, function description, main features, architecture, and use case diagrams. The e-learning model is implemented with LMS Moodle and the adaptive function is made in module form. Performance, the first system identifies the trend of learning styles through a questionnaire that is Visual, Auditory, or Kinesthetic. Furthermore scores are used by the system as the basis for giving different materials to the students.

OVIPOTIONAL AND PREFERENCIAL TEST OF Bactrocera albistrigata ON GUAVA EXTRACTS Nadia Farida; Agus Susanto
Jurnal Penelitian Saintek Vol 23, No 1 (2018): April 2018
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Bactrocera albistrigata commonly attacks rose apple and guava. It is capable of causing up to 100% damage on guava. The study was aimed at determining the most preffered fruit extract by B. albistrigata. The research was conducted at Rearing Pest Laboratory of Faculty of Agriculture Universitas Padjadjaran in Jatinangor, Sumedang. The experiment used Completely Randomized Design consisting of three treatments and four replications. The treatments were conducted on red guava extract, rose apple extract, and guava essences by the used of choice and no choice tests. The result shows that in the red guava extract has the highest number of eggs of B. albistrigata compared to that in rose apple extract and guava essences.UJI PREFERENSI DAN OVIPOSISI Bactrocera albistrigata PADA EKSTRAK JAMBUBactrocera albistrigata lebih sering menyerang tanaman jambu biji dan jambu air. Kehilangan hasil pada tanaman jambu biji yang disebabkan oleh serangan lalat buah ini dapat mencapai 100%. Penelitian ini bertujuan untuk mengetahui ekstrak buah yang paling disukai lalat buah B. albistrigata. Penelitian dilaksanakan di Laboratorium Perbanyakan Serangga, Departemen Hama, dan Penyakit Tumbuhan, Fakultas Pertanian, Universitas Padjadjaran, Jatiangor, Sumedang. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) yang terdiri atas 3 perlakuan dengan 4 ulangan. Perlakuan terdiri atas ekstrak jambu biji merah, ekstrak jambu air, dan esens jambu. Dengan menggunakan choice dan no choice test, hasil penelitian menunjukkan bahwa dalam ekstrak jambu biji merah terdapat jumlah telur B. albistrigata yang lebih tinggi dari ekstrak jambu air dan esens jambu.

EFFECT OF RATIO VARIATION Mg / AL IN SYNTHESIS OF HYDROTALSIT WITH HYDROTHERMAL COPRECIPITATION METHOD Sri Handayani; Cahyorini Kusumawardani; Kun Sri Budiasih
Jurnal Penelitian Saintek Vol 19, No 1: April 2014
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Catalyst are divided into two kinds, homogeneous and heterogeneous catalysts. The catalys tthat constantly developed isa heterogeneous catalyst because could be separated easily and reuseable. The purpose of this research were synthesis and characterization of hydrotalcite Mg/Al as a heterogeneous catalyst which can be use din the aldol condensation reaction. Synthesis hydrotalcite was conducted by hydrothermal coprecipitation method. Synthesis performed with variations mol Mg/Alat a temperature hydrothermal 1000C for 15 hours. Hydrotalcite as a heterogeneouscatalyst preparation was done by calcinationat 4000C. Characterization of synthesized hydrotalcyte was performed by FTIR to identified functional group and XRD analysis to characteriz edits structure. The results showed that the optimum conditions for the synthesized hydrotalcite was obtained atmole ratio Mg/Al3:1.

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