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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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MOSQUITO DISTRIBUTION OF MOSQUITE-DISEASES MALARIA, JAP ANCE ENCEPHALITIS AND FILARIA IN SEVERAL A CENTRAL JAVA AREA Hasan Boesri; Damar Tri Boewono; Hadi Suwasono; Raharjo Raharjo
Jurnal Penelitian Saintek Vol 7, No 1: April 2002
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

A study on distribution of Malaria, Filariasis, Japanise encephalitis vectors was conducted in several areas of Central Java in 1998/1999. The result showed that larvae of An. barbirostris, An. subpictus, An. aconitus, An. vagus, An. maculatus, An. kochi, Lutzia sp, Cx. vishnui, Cx.pipiens quinquefasciatus,' Cx. gelidus, Lutzia sp Cx. tritaeniorhynchus, Cx. bitaeniorhynchus and Cx. fuscocephalus werefound in the Rice field. Larvae of Ae. Albopictus and Ar. kucingensis were found in the coconut shell. Larvae of Ae. Albopictus and Malaya sp were found in the Banana leaf axil. Larvae of Ae. Albopictus, Ae. aegypti and Cx. pipiens quinquefasciatus werefound in the artificial container. Larvae of Ae. poicilius, and Malaya sp were found in Callocasia leaf axil. Larvae of An. barbirostris, An. vagus, An. subpictus, An. tessellatus, Cx. vishnui, and Mn. uniformis were found in the swamp. Larvae of ex. Pipiens quinquefasciatus were found in the polluted water. Larvae of An.sundaicus, An. subpictus, An. barbirostris and An. vagus werefound in the tick pond. An. maculatus, Ae. albopictus, and An. vagus larvae werefound in the rock pool. Larvae An. barbirostris, Cx. vishnui, and Cx. bitaeniorhynchus of were found in the irrigation canal. Larvae of ex. vishnui, and ex. fuscocephalus were found in the Stream pool. An. barbirostris, ex. fragilis, An. vagus, Cx. Vishnui and Cx. bitaeniorhynchus larvae were found in the pond. Larvae of ex. vishnui were found in the ground pool. Larvae of Ae. albopictus werefound in the Bamboo stump. An. nigerrimus, An. peditaeniatus,. An. vagus, An. subpictus, An. aconitus, An. annularis, An kochi, An. jlavirostris, An. barbirostris, An. indevinitus An. tessellatus, An.maculatus, Cx. bitaeniorhynchus, ex. vishnui, ex. tritaeniorhynchus, Cx. fuscocephalus, Mn. uniformis, Cx.pipiens quinquefasciatus, Cx. gelidus, Mn. uniformis, Ae. poicilius, Ae. subalbatus, and Ar. kuchingensis were found in the cattle shelter during night collection. Based on the information mentioned above showed that the higher area the less of larvae species. Each larval species has a specific breeding site. This data is usefulfor mosquito'control program.

DETECTION SYSTEM OF OPTICAL LIGHTING HAZARDS TO RECEIVE THE RAYLEIGH HOLIDAYS COMPARED TO THE CONVENTIONAL SYSTEM Suparno Suparno
Jurnal Penelitian Saintek Vol 7, No 2: Oktober 2002
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

mode fibre optics of 4.6pm diameter and a quarter pitch rens has been coupled by the use of SF connector and stainless housing to produce a very reliable light transducer. The ltIII'SdulCeirs capable of transmitting light thousands times compared of using fibre optics only. Besides its ability in transmittingit has some other advantages such as small dimension and relatively cheap cost of production. The reliability of the transducer ill transmitting light was tested to observe scattered light from very JlnQIIparticles of toluene known as Rayleigh scattering.

SYNTHESIS OF HYDROGEL SUPERABSORBEN BASED ON ACRYLAMID AND ACRYLIC ACID IN ATMOSPHERE CONDITION Agus Salim; Suwardi Suwardi
Jurnal Penelitian Saintek Vol 14, No 1: April 2009
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The aim of this research is to synthesis poly(acrylic-acrylamide) at atmosphere condition and know absorbency or swelling degree of polymer that produced in water or urine. The synthesis was done through the mixing of 2 mL acrylic acid with potassium hidroxide solution so that potasium acrylic salt formed, then this salt solution was mixed with a mixtures of methylene bis-acrylamide (MBA), potassium persulphate and sodium metabisulphite (SMBS) solutions. The gels were formed and then dried at 70 oC during 18 hours for obtaining constant weight. The result of synthesis was white hydrogel analysed using FTIR spectrometry method and measured its absorbency or swelling degree in water or urine. Based on the result of its water absorbency was found that the synthesed polymer using 0.02 g MBA and 0.014 g SMBS might absorbed 184.76 g water per gram polymer

OPTIMIZATION CONCENTRATION OF NATRIUM HIDROKSIDA IN 2.6-BIS-(3’,4’-DIMETHOXY-BENZYLIDENE)CYCLOHEXANONE SYNTHESIS THROUGH CLAISEN-SCHMID REACTION Nurul Khotimah Putri Pertiwi; Sri Handayani; C Budimarwanti; Winarto Haryadi
Jurnal Penelitian Saintek Vol 20, No 2: Oktober 2015
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This research aimed at determining the optimization concentration of NaOH as a catalyst to produce the compound 2.6-bis(3’,4’-dimethoxybenzylidene) cyclohexanone in maximum yield through Claisen-Schmidt reaction. Synthesizing of 2.6-bis-(3’,4’ dimethoxybenzylidene)cyclohexanone through Claisen-Schmidt reaction was conducted by stirring method for two hours at 10°C. Raw materials used were 3,4-dimethoxybenzaldehyde and cyclohexanone. In this research, NaOH was used as a catalyst. The solvents that used were aquades and methanol. Moles variations of NaOH which was added in the research were 0.005; 0.01; 0.02; 0.04 and 0.08 moles. The results shows that the NaOH 0.005, 0.01, 0.02, 0.04, and 0.08 mol have produce in yield, 89.56, 81.23, 107.68, 115.98, and 14.55% respectively. From the data it can be seen the optimum yield obtained at NaOH 0.04 mol.

THE AIR POLLUTION AND SOUND MANAGEMENT OF AUTOMOTIVE MECHANICAL ENGINEERING LABORATORY - Murdani
Jurnal Penelitian Saintek Vol 21, No 1: April 2016
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study was aimed at: (1) determining the reduction of noice pollution after using extra mufﬂ er, (2) calculating the reduction of air pollution after using heater reactor. The both of the research is conducted in automotive-mechanical engineering laboratory. This study was used experimental method. The instruments used in this study were: (1) gas analyzer and smoke tester, (2) digital thermometer, and (3) sound level meter. The results show that the use of extra mufﬂ er in the automotive-mechanical engineering laboratory of State University of Semarang is able to decrease of sound power of 9.46 percent. The mean of sound level before using extra mufﬂ er was 69.58dB, while the magnitude of the mean level after using extra mufﬂ er is 63 dB. Electrical heater as a thermal reactor is able to reduct CO level of 1.888 percent and HC level of 262 percent in the exhaust gas. The measurement of CO level of exhaust gas emission before using the reactor was 1.888 percent and HC level of 262 ppm, while CO level and HC level after using the reactor is 1.521 percent and 237 ppm.

USE OF SODIUM CARBONATE TO INCREASE QUALITY OF BAKAU ON SOLID CARBURISING PROCESS Mujiyono Mujiyono; Arianto Leman Soemowidagdo
Jurnal Penelitian Saintek Vol 17, No 1: April 2012
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Upaya peningkatan kualitas arang bakau untuk proses karburising padat telah dilakukan dengan penambahan natrium karbonat (Na2CO3). Arang bakau digilas menjadi serbuk dan disaring dengan ukuran mesh 30. Serbuk arang ini dicampur Na2CO3 dengan variasi 0, 15, 20, 25 dan 30 % berat. Hasil campuran ini digunakan untuk proses karburising padat pada benda uji baja karbon rendah dengan 98,34% Fe dan 0,156% C pada suhu 850oC selama 4 jam. Benda-benda uji hasil karburising ini dipanaskan kembali pada 850oC selama 5 menit, kemudian dicelupkan ke dalam air 28oC. Hasil penelitian menunjukkan bahwa penambahan 25% berat Na2CO3 menghasilkan case depth setebal yaitu 520 µm dan kekerasan permukaan maksimum 683 VHN. Perubahan struktur mikro dari ferrit-perlit ke martensit setelah proses pencelupan menunjukkan bahwa terjadi peningkatan unsur karbon pada permukaan benda uji baja ini hingga kedalaman 520 µm.Kata kunci: arang bakau, karburising padat, natrium karbonat

THE ANALYSIS OF RECIPROCATING COMPRESSOR PK 60-150 FAILURE USING FAILURE MODE AND EFFECT ANALYSIS METHOD Nanang Qosim
Jurnal Penelitian Saintek Vol 22, No 2: Oktober 2017
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The reciprocating compressor PK 60-150 is the most common type of compressor used in industries. The effect of each failure mode on the reciprocating compressorwas analyzed using FMEA, so that the necessary action can be determined. Both increasing the operating time and preventing the damage of compressor aremajor concerns. This study was aimed to determine the problems that cause risk of safety, failure of compressor function, and shortening of compressor life time,so that maintenance and repair cost can be reduced. The result shows that the breaking of high wires and fuses, over heat and wear of the piston are the mostaffecting factors of compressor failure with RPN value of 64

ANTIOXIDANT ACTIVITY AND ANTIKANKER DERIVATING BENZALASETON Sri Handayani; Retno Arianingrum; Winarto Haryadi
Jurnal Penelitian Saintek Vol 18, No 1: April 2013
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Modification of vanillin structure to vanililacetone and divanililaseton and its activity test as antioxidant and anticancer have been done. The structural modification is carried out by condensation of the crosslinked aldol in an alkaline atmosphere with the aqueous ethanol solvent for 3 hours at 10 ° C. The antioxidant activity test on the synthesis compound was done by deoxyribose degradation method, while the anticancer activity test was done by MTT method. The results of antioxidant activity test show that the divanililaseton with IC50 is 873 ug / ml. more active than vanililacetone with IC50 of 11,765 ug / ml .. IC50 data for anticancer activity against cancer cell HeLa vanilinaseton and divanilinaseton respectively of 51.68 and 10.26 ug / ml. These results show that both compounds are very toxic to HeLa cancer cells.

THE APPLICATION FOR COMBINING SYNTHETIC AND LIQUID FERTILIZERS TO IMPROVE PADDY YIELD Rustini Rustini; Anni Yuniarti; Yuliati Machfud
Jurnal Penelitian Saintek Vol 23, No 2: Oktober 2018
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study was aimed at determining the best combination of N,P,K and Si-enriched liquid fertilizer on P-soil, P absorption and Si plant, Si total soil, and paddy yield. The study was carried out in Ciparanje experimental garden greenhouse, Faculty of Agriculture, Padjadjaran University, Jatinangor, Sumedang, West Java in August to December 2017. The location was around 750 masl. The materials used in this research activity include Ciherang Varieties, Urea, SP-36, KCl, straw and hanjeli compost at doses of 20 t.ha-1, and Liquid Fertilizers (PC) enriched by Si from paddy husk ash. Seeds used in research activities were 14 days after seeding (HSS). The experimental design was carried out using a Randomized Block Design (RBD) consisting of 10 treatments with three replications. Based on the results of the study, it can be concluded as follows: (1) Giving a combination of N, P, K and Si-enriched liquid fertilizer influences the P-soil, P absorption, Si plant, and Ciherang paddy, (2) The combination gives the best paddy result with Dry Grain (GKG) weight of 51.70 g / plant or equivalent to 6.62 t.ha-1.APLIKASI PENGKOMBINASI PUPUK SINTETIS DAN PUPUK CAIR UNTUK MENINGKATKAN HASIL PANEN PADIPenelitian ini bertujuan untuk mengetahui kombinasi terbaik antara pupuk N,P,K dan pupuk cair yang diperkaya Si terhadap P-tersedia tanah, serapan P dan Si tanaman, Si total tanah, dan hasil padi sawah. Penelitian dilaksanakan di rumah kaca kebun percobaan Ciparanje Fakultas Pertanian Universitas Padjadjaran, Kecamatan Jatinangor, Kabupaten Sumedang, Jawa Barat pada bulan Agustus sampai dengan Desember 2017. Lokasi percobaan berada di ketinggian sekitar 750 meter di atas permukaan laut (mdpl). Bahan yang digunakan dalam kegiatan penelitian ini di antaranya adalah padi sawah Varietas Ciherang, pupuk Urea, SP-36, KCl, kompos jerami, dan hanjeli dengan dosis 20 t.ha-1, dan Pupuk Cair (PC) yang diperkaya Si asal abu sekam padi. Bibit yang digunakan dalam kegiatan penelitian berumur 14 Hari Setelah Semai (HSS). Rancangan percobaan yang dilakukan menggunakan Rancangan Acak Kelompok (RAK) yang terdiri dari 10 perlakuan dengan tiga ulangan. Berdasarkan hasil penelitian dapat disimpulkan sebagai berikut. (1) Pemberian kombinasi N,P,K dan pupuk cair yang diperkaya Si berpengaruh terhadap P-tersedia, serapan P, serapan Si, dan hasil padi sawah varietas Ciherang pada Inceptisols asal Jatinangor. (2) Kombinasi memberikan hasil padi sawah terbaik dengan bobot Gabah Kering Giling (GKG) sebanyak 51,70 g/tanaman atau setara dengan 6,62 t.ha-1

SYNTHESIS AND CARATERIZATION OF SNO2 AS A DEVELOPMENT EFFORTS WHITE TIN PRODUCTS TO IMPROVE NATIONAL DEVISES Anti Kolonial Prodjosantoso; Endang Widjajanti Laksono; M. Pranjoto Utomo
Jurnal Penelitian Saintek Vol 16, No 2: Oktober 2011
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Long-term goal of this research is to apply nanotechnology in the development of downstream products of tin to increase the national foreign exchange. As a preliminary study, SnO2 was synthesized by dissolving tin metal in concentrated HCl followed by addition of concentrated NH4OH in dropwise. The precipitate was filtered, dried, and partially characterized using IR spectrophotometer FTIR-8300/8700 model in the range of wave number of 400 cm-1 to 4000 cm-1, whilst the rest was then heated in a furnace at temperature about 900 °C for 4 hours. The oxide was then cooled and characterized by using XRD Zhimadsu S6000 diffractometer using monochromatic Cu KĮ radiation with a wavelength (Ȝ) of 1.5406 Å in the 2ș range 5o to 90o , and scanning electron microscope (SEM) JEOL T330 A operating at 15 keV. The crystallography aspects of SnO2 was studied based on the X-ray diffraction data (XRD) which was analyzed with Rietveld method using the WinPLOTR program. The SnO2 oxide was found to be tetragonal P42/mnm space group having lattice parameters of a = b = 4.7337(2) ǖ and c = 3.1841(3) ǖ. The particle size of the SnO2 oxide was found to be about 35.39 nm.

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