Garuda - Garba Rujukan Digital

Article Per Year (5 Year)

All

Jurnal Penelitian Saintek

saintek
Website

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

15 16 17 18 19

APPLICATION OF ENDOPHYTIC BACTERIUM BIOFERTILIZER IN TOMATOES HYDROPONIC SYSTEM Imas Komalasari; Mieke Rochimi Setiawati; Ridha Hudaya
Jurnal Penelitian Saintek Vol 23, No 1 (2018): April 2018
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The study was aimed at determining the role of endophytic bacteria biofertilizers as the substitutes for the use of inorganic fertilizers for tomato hydroponic systems. The study was conducted in August-December 2017 at the Ciparanje Experimental Garden Greenhouse, Padjadjaran University. The experiment used a randomized block design (RBD) with 7 treatments and 8 replications. Treatment A: 100% inorganic nutrition + 0 biological fertilizer, B: 50% inorganic nutrition + 100% biological fertilizer, C: 75% inorganic nutrition + 100% biological fertilizer, D: 100% inorganic nutrition + 25% biological fertilizer, E: 100% inorganic nutrition + 50% biological fertilizer F: 100% inorganic nutrition + 75% biological fertilizer, G: 100% inorganic nutrition + 100% biological fertilizer. The results show that the application of biofertilizers by reducing the dose of inorganic fertilizer had no significant effect on the population of the leaf and the root on endophytic bacteria, N content and yield of tomato plants. Biofertilizers are able to increase the weight of tomato in the 50% treatment of inorganic nutrients + 100% biofertilizers (B) of 39.69% compared to the use of inorganic fertilizers only without the addition of biological fertilizers (A)APLIKASI PUPUK HAYATI BAKTERI ENDOFITIK PADA SISTEM HIDROPONIK TANAMAN TOMATPenelitian dilakukan untuk mengetahui peran pupuk hayati yang mengandung bakteri endofitik sebagai pensubstitusi penggunaan pupuk anorganik untuk tanaman tomat yang ditanam dengan sistem hidroponik. Penelitian dilakukan pada bulan Agustus-Desember 2017 di Rumah Kaca Kebun Percobaan Ciparanje, Universitas Padjadjaran. Percobaan menggunakan Rancangan Acak Kelompok (RAK) dengan 7 perlakuan dan 8 ulangan. Perlakuan A: 100% nutrisi anorganik + 0 pupuk hayati, B: 50% nutrisi anorganik + 100% pupuk hayati, C: 75%nutrisi anorganik + 100% pupuk hayati, D: 100% nutrisi anorganik + 25% pupuk hayati, E: 100% nutrisi anorganik + 50% pupuk hayati F: 100% nutrisi anorganik + 75% pupuk hayati,G: 100% nutrisi anorganik + 100% pupuk hayati. Hasil penelitian menunjukkan bahwa pemberian pupuk hayati dengan mengurangi dosis pupuk anorganik tidak berpengaruh nyata terhadap populasi bakteri endofitik daun dan akar, kandungan N dan hasil tanaman tomat. Pupuk hayati mampu meningkatkan bobot buah tomat pada perlakuan 50% nutrisi anorganik + 100% pupuk hayati (B) sebesar 39,69% dibandingkan hanya menggunakan pupuk anorganik tanpa penambahan pupuk hayati (A).

OPTIMIZATION OF TRANSPORT SYSTEM IN YOGYAKARTA CITY WITH VEHICLE ROUTING PROBLEM MODEL USING ALGORITHM SEQUENTIAL INSERTION Rminugroho Ratna Sari; Dwi Lestari
Jurnal Penelitian Saintek Vol 19, No 1: April 2014
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The purposes of this study were to build a model for vehicle routing problem (VRP) for waste transportation in Yogyakarta, solve the model obtained using sequential insertion algorithm, then create an Excel Macro programming language to simulate the problem. Waste transportation conditions can be analogous to the VRP by adding intermediate facility at the end of the route, which in this case is the landfill (TPA). To determine waste transportation solved by sequential insertion algorithm. This algorithm is a method to obtain a travel route by updating the node that has not been assigned by inserting between the nodes that have been assigned. Based on 22 TPS simulated with Macro Excel, obtained 4 tours if given planning horizon length is 3 hours, and gained 3 tours if given planning horizon length is 4 hours.

MANUAL MATERIAL HANDLING IN THE ‘KARUNG’ LIFTING PROCESS USING BIOMECHANIC AND PHYSIOLOGI APPROACH Okka Adiyanto; Fajar Aji Prasetyo; Muhammad Faris Kautsar Ramadhani
Jurnal Penelitian Saintek Vol 24, No 1: April 2019
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study was aimed at minimizing musculoskeletal disorder (MSDs) in heavers on traditional markets by completing facilities and improving lifting techniques that are in accordance with ergonomic aspects. This research was conducted in traditional markets with heaver objects which are often carried out in the process of moving goods. This study used biomechanics and physiology methods to be able to analyze body posture so that it can prevent spinal damage. The data were then analyzed using Maximum Permissible Limit (MPL), which previously carried out data collection on the size of the body posture. The analysis of the results was done to determine the value of the compression force (FC). FC values are the basis for comparison with Action Limit (AL). The results show that FC values = 10,018,078N, FC MPL. Importantly, the position of the heavers’ posture is at a dangerous level. Proposed improvements using a tool and after being developed again will result in changes in FC values to 3370.94, FC AL means the position of the body in a safe condition. The results of this study are expected to provide an assessment that helps prevent spinal damage.MANUAL MATERIAL HANDLING PADA PROSES PENGANGKATAN KARUNG MENGGUNAKAN PENDEKATAN BIOMEKANIKA DAN FISIOLOGI Penelitian ini bertujuan untuk meminimumkan keluhan Musculoskeletal disorder (MSDs) pada pekerja kuli panggul di pasar tradisional dengan merancang fasilitas dan memperbaiki teknik memindahkan barang yang sesuai dengan aspek ergonomis. Penelitian ini dilakukan di pasar tradisional dengan objek kuli panggul yang sering melakukan proses pemindahan barang. Penelitian ini menggunakan metode pendekatan biomekanika dan fisiologi untuk dapat menganalisis postur tubuh sehingga dapat mencegah cedera tulang belakang. Data kemudian dianalisa menggunakan Maximum Permissible Limit (MPL) yang sebelumnya dilakukan pengambilan data ukuran postur tubuh pekerja tersebut. Analisis hasil dari perhitungan dilakukan untuk mengetahui nilai dari force compresion (FC). Nilai FC menjadi dasar untuk dibandingkan dengan Action Limit (AL). Hasil dari analisa didapat nilai FC = 10.018,078N, FCMPL. Artinya, posisi postur tubuh pekerja dalam level berbahaya. Usulan perbaikan dengan menggunakan alat bantu dan setelah dianalisis kembali maka akan menghasilkan perubahan nilai FC menjadi 3370,94; FC AL artinya posisi tubuh dalam keadaan aman. Hasil penelitian ini diharapkan dapat memberikan rekomendasi alat bantu sehingga dapat mencegah cedera tulang belakang.

INFLUENCE OF CALCULATION TEMPERATURE TO HIDROTALSIT Mg / Al WHICH IS DISINTESTED THROUGH UNSECUAL METHOD OF PRESIPITATION Hasan Adidarma; Sri Handayani; Cahyorini Kusumawardani; Kun Sri Budiasih
Jurnal Penelitian Saintek Vol 19, No 2: Oktober 2014
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This research aims to determine the effect of calcination temperature variation from 200°C to 500°C on the Mg/Al hydrotalcite structure. Mg/Al hydrotalcite has been synthesized via a low supersarturated precipitation method with hydrothermal treatment, using Mg(NO3 )2 .6H2 O and Al(NO3 )3 .9H2 O as the raw materials, and base solution of NaOH and Na2 CO3 as the precipitators. Mg/Al hydrotalcite compound synthesized before and after calcination were characterized using fourier transform infrared (FTIR) and X-ray diffractometer (XRD). The results of FTIR and XRD data analysis showed that the calcination of hydrotalcite of Mg/Al at 200o C did not changed the structure of hydrotalcite compounds, calcination at temperatures 300-400o C showed that structure of hydrotalcite compound starts to change form a mixture of magnesium oxide and aluminum, and calcination at 500°C showed that the crystal structure of Mg/Al hydrotalcite has broken to form a mixture of metal oxides, namely MgO (phericlase) with a little mixture of aluminum oxide in the form of θ-Al2O3 and γ-Al2O3.

PEMODELAN 2D LAPISAN BAWAH PERMUKAAN BERDASARKAN DATA GAYA BERAT MIKRO Supriyadi Supriyadi; Khumaedi Khumaedi; Fajar Setiawan; Teguh MM
Jurnal Penelitian Saintek Vol 25, No 1 (2020)
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Penelitian ini bertujuan untuk mendeskripsikan lapisan bawah permukaan tanah berdasarkan data gaya berat. Pengukuran dilakukan pada bulan Januari 2019. Penelitian menggunakan metode geofisika yaitu metode gaya berat dan metode survei. Setelah dilakukan pengolahan kemudian data anomali gravitasi dapat diinterpretasikan dengan bantuan peta geologi. Alat yang digunakan adalah Gravimeter Scintrex CG-5 Autograv. Hasil penelitian menunjukkan bahwa struktur bawah permukaan dapat diinterpretasikan dalam empat lapisan. Lapisan pertama yaitu top soil yang termasuk formasi aluvium (Qa) dengan densitas rata-rata batuan 2.1 g/cm3 dengan kedalaman 0-50 m. Lapisan kedua memliki densitas rata-rata batuan 2.3 g/cm3 di kedalaman 50-120m. Lapisan ketiga memiliki densitas rata-rata batuan 2.4 g/cm3 di kedalaman 120-195m. Penyusun batuan lapisan pertama hingga ketiga merupakan batuan sedimen seperti lempung, batupasir, dan batu serpih. Lapisan keempat adalah base yang termasuk formasi damar (Qtd) dengan densitas 2,67 g/cm3 di kedalaman lebih dari 195 m dengan batuan penyusun didominasi breksi vulkanik dan tufan halus.2D MODELING SUBSURFACE LAYER BASED ON MICROGRAVITY DATAThis study was aimed at describing the subsurface layer based on the gravity data. The measurements were made in January 2019. The study used the geophysical method, namely the gravity method and the survey method. After being analyzed, the anomaly gravitation data then interpreted using geological maps. Gravimeter Scintrex CG-5 Autograph was used in this study. The results show that subsurface structures can be interpreted in four layers. The first layer is topsoil which includes alluvium (Qa) formation with an average rock density of 2.1 g/cm3 with a depth of 0-50 m. The second layer has an average rock density of 2.3 g/cm3 at a depth of 50-120m. The third layer has an average rock density of 2.4 g/cm3 at a depth of 120-195m. First to third layer rock compilers are sedimentary rocks such as clay, sandstone, and shale. The fourth layer is a base that includes the formation of resin (Qtd) with a density of 2.67 g/cm3 at a depth of more than 195 m with the constituent rocks dominated by volcanic breccias and fine tuffs.

ANALYSIS OF DISTRIBUTION SIMULATION OF SUSPENDED SLAB AND CYLINDER SUPERKONDUCTOR USING ELEMEN METHOD Supardi Supardi
Jurnal Penelitian Saintek Vol 11, No 1: April 2006
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Investigation of creation of ordered parameter distribution on superconductor material, especially cylinder form has been conducted. Distribution of ordered parameter inside the material is obtained by applying external magnetic field parallel to the surface of the material. When the external magnetic field is reduced carefully, ordered parameter distribution will create at a certain value called He).The method applied to obtain the ordered parameter distribution isfinite element method. To make easy in computation work, be applied FEMLAB software. The software works under MATLAB running. Principles of finite element method have been covered in FEMLABThe result of the numerical simulation show in line between the beginning hypothesis of researcher and computation result. Compared with previous result, the result does not deviate significantly.

THIN COCONUT COMMOMOGRAPHY FOR DETERMINATION OF HEARTIDINE IN ORANGE OF ORANGE FROM ORANGE Sri Handayani; Sunarto Sunarto; Susila Kristianingrum
Jurnal Penelitian Saintek Vol 10, No 1: April 2005
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This research with the title Thin Layer Chromatography for Determination of Hesperidins Content in Orange Peel has been done in organic chemistry laboratory. The aim of this research is to select the solvent mix for the best hesperidins standard peak result and to determinate the content (in relative percentage) of some orange peel. Hesperidins isolation from orange peel conduct by soaks the orange peel piece in f 0% Calcium hydroxide solution for a night in room temperature. The mixture than jiltered and neutralized with hydrochloric acid to obtain hesperidins contain filtrate. Hesperidins analyzed by thin layer chromatography. Characterization of hesperidins did by compare the sample chromatogram with standard chromatogram. The yield (in relative percentage) determinate by compare the sample peak area with hesperidins standard peak area. The solvent mix selected before by attempt some solvent mix for eludate hesperidins standard solution. The result of this research shown that hesperidins can analyzed using thin layer chromatography method. with the best solvent was chloroform: methanol mixture (2 : 3). Hesperidins content in extract solution of some strain orange peel is; Baby Egypt 0, f 380%, Baby Pacitan 0,0615%, Mandarin Lokam 0,0018%, Santang 0,0049%, and Sunkist Nevel 0,0360%. The hesperidins content in orange peel of Mandarin Pakistan, Medan super, Nipis, Sunkist, Peras, and Purut was 0,0000. The hesperidins content in these orange peel was too low to be detected

A STUDY ON THE HAZARD OF ERUPTION AND LANDSLIDE IN INTERVOLCANIC BASIN OF MERAPI-MERBABU CENTRAL JAVA Nurhadi Nurhadi; Arif Ashari; Suparmini Suparmini
Jurnal Penelitian Saintek Vol 20, No 1: April 2015
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study aimed to: (1) assess the eruption and landslide hazard, and (2) create a map of the spatial distribution of hazard in intervolcanic basin of the Merapi-Merbabu, Central Java Province. The method employs in this research was exploratory surveys, with regional complex approach. The population in this study were all landscape phenomena between intervolcanic basin of Merapi-Merbabu, located in parts of sub-district Sawangan, Magelang District, and sub-district Selo, Boyolali District. Sample was determined by observation of purposive sampling technique that at each terrain unit. Data collecting was carried out with observation, interpretation of remote sensing imagery, literature review, and documentation. The analysis used GIS analysis, scoring analysis, supported by descriptive analysis. The results showed the hazard of volcanic eruption varies between moderate to high. Moderate hazard exist in the area of Merbabu Volcano, while high hazard exist in the area of Merapi Volcano. High hazard mainly affected by high level of distance from active crater of Merapi Volcano and slope. The landslide hazard varies between very low to moderate. Very low and low hazard exist in the area of Merapi Volcano, while moderate hazard exist in the area of Merbabu Volcano. Moderate hazard mainly affected by high level of slope, soil texture, soil depth, and vegetation density.

MODELING DATA FUZZY TIME SERIES WITH USING THE DECOMPOSITION OF SINGULAR AND VALUE THE APPLICATION OF INFLATION INFLUENCE LEVEL IN INDONESIA Agus Maman Abadi
Jurnal Penelitian Saintek Vol 14, No 1: April 2009
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The aims of this research are to construct a new method for modeling fuzzy time series data and to apply the method for forecasting Indonesian inflation rate. The procedure of this research is done by the following steps: (1) determine fuzzy relations using table lookup scheme, (2) Apply the singular value decomposition to reduce the unimportant fuzzy relations, (3) apply the method to forecasting Indonesian inflation rate. The result of this research is that it was designed a new method to construct the fuzzy time series model using singular value decomposition method. Then, the method is applied to forecast the Indonesian inflation rate based on fuzzy time series data. Forecasting inflation rate using the proposed method yields a higher accuracy than that using table lookup scheme and neural network methods.

ROOM SEARCHING APPLICATION IN HOTEL RESERVATION SYSTEM BY USING EVERYDAY LANGUAGE INTERFACE Hernawan Sulistyanto; - Nurgiyatna
Jurnal Penelitian Saintek Vol 20, No 2: Oktober 2015
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study was aimed at creating a prototype of the hotel reservation system with colloquial interface. An input provided by the prospective hotel guests which form a sentence using colloquial language. Indonesian language will be used to query the data of rooms that is stored in a hotel data base. The performance of reservation system relies heavily on a wealth of knowledge and data held by the system. The output of the system is room information in accordance with the given query by the potential guests. The existence of this room searching model with colloquial interface is expected to be an alternative to the hotel reservation service in order to provide a more ﬂ exible system in the interaction with the guests.

Page 17 of 29 | Total Record : 286

15 16 17 18 19

Filter by Year

2001 2025

Filter By Issues

All Issue Vol 30, No 2 (2025) Vol 30, No 1 (2025) Vol 29, No 2 (2024) Vol 29, No 1 (2024) Vol 28, No 2 (2023) Vol 28, No 1 (2023) Vol 27, No 2 (2022) Vol 27, No 1 (2022) Vol 26, No 2 (2021) Vol 26, No 1 (2021) Vol 25, No 2 (2020) Vol 25, No 1 (2020) Vol 24, No 2: Oktober 2019 Vol 24, No 1: April 2019 Vol 23, No 1 (2018): April 2018 Vol 23, No 2: Oktober 2018 Vol 22, No 2: Oktober 2017 Vol 22, No 1: April 2017 Vol 21, No 2: Oktober 2016 Vol 21, No 1: April 2016 Vol 20, No 2: Oktober 2015 Vol 20, No 1: April 2015 Vol 19, No 2: Oktober 2014 Vol 19, No 1: April 2014 Vol 18, No 2: Oktober 2013 Vol 18, No 1: April 2013 Vol 17, No 1: April 2012 Vol 16, No 2: Oktober 2011 Vol 16, No 1: April 2011 Vol 15, No 2: Oktober 2010 Vol 15, No 1: April 2010 Vol 14, No 1: April 2009 Vol 13, No 1: April 2008 Vol 12, No 2: Oktober 2007 Vol 12, No 1: April 2007 Vol 11, No 1: April 2006 Vol 10, No 2: Oktober 2005 Vol 10, No 1: April 2005 Vol 9, No 1: April 2004 Vol 8, No 2: Oktober 2003 Vol 8, No 1: April 2003 Vol 7, No 2: Oktober 2002 Vol 7, No 1: April 2002 Vol 6, No 1: Saintek 2001 More Issue

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kab. sleman,

Daerah istimewa yogyakarta

INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name -

Contact Email -

Phone -

Journal Mail Official -

Editorial Address -

Location Kab. sleman, Daerah istimewa yogyakarta INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kab. sleman,

Daerah istimewa yogyakarta

INDONESIA