{"title":"PENINGKATAN PERFORMA SEPEDA MOTOR DENGAN VARIASI CDI PROGRAMMABLE THE IMPROVEMENT OF MOTORCYCLES PERFORMANCE USING CDI PROGRAMMABLE","authors":"I. Siswanto, Y. Efendi","doi":"10.30738/jst.v1i1.478","DOIUrl":"https://doi.org/10.30738/jst.v1i1.478","url":null,"abstract":"The study aims to determine the engine performance characteristics of motorcycle that use CDI genuine and CDI programmable, and differences in performance characteristics of motorcycle engine that uses the CDI genuine and CDI programmable. The study method used was experimental. The object of study was motorcycle 1 cylinder 125 cc. The equipment used to perform power measurement was dynotest motorcycle vehicle. Experiments conducted with the motorcycle still conditions in accordance with standard factory (no modification). The results showed that (1) Motorcycles with CDI Genuine produces the highest power 8HP obtained at 6542 RPM and the highest was 10.12 NM torque at 5085. While the RPM after it was replaced with CDI Programmable, peak power of 8.2 at 6556 RPM and torque of 10.33 in 4670. (2) There was a difference in engine performance using CDI genuine and CDI Programmable. The highest power achieved in almost all variations of CDI Programmable, amounting 8,2HP. The highest torque was obtained by advancing the CDI Programmable Timing 2 degrees, it 10,33Nm at 4670 RPM","PeriodicalId":433636,"journal":{"name":"Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131471100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"DE-ALGEBRAS, E-LOGIC DAN E-SET THEORY","authors":"Denik Agustito","doi":"10.30738/jst.v1i1.475","DOIUrl":"https://doi.org/10.30738/jst.v1i1.475","url":null,"abstract":"Dalam logika biasa, disjungsi yang digunakan dalam beberapa pernyataan matematika menggunakan disjungsi inklusif dan ini mendapatkan sebuah struktur aljabar baru yang terdiri dari himpunan semua pernyataan bersama dengan konjungsi, disjungsi inklusif, negasi, tautologi dan kontradiksi yang akan dinamakan dengan aljabar boolean. Didalam logika biasa juga ada sebuah gagasan disjungsi yang lain yaitu disjungsi eksklusif. Paper ini akan menjelaskan tentang struktur aljabar baru yang dikonstruksi jika disjungsi inklusifnya diganti dengan disjungsi eksklusif dan apa akibatnya bagi logika dan teori himpunan jika dibangun berdasarkan struktur aljabar yang baru tadi","PeriodicalId":433636,"journal":{"name":"Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133955773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"PENANGANAN LIMBAH GERGAJIAN BATU ALAM PASCA ERUPSI MERAPI","authors":"S. Huda, Aji Pranoto","doi":"10.30738/jst.v1i1.474","DOIUrl":"https://doi.org/10.30738/jst.v1i1.474","url":null,"abstract":"Stone sawing process in the area of Sleman leaves stone powder as waste, which discharged directly onto the ground can result into a barren land can not be planted and will also lead to ground can not absorb rainwater where this can lead to severe environmental damage, such as floods and droughts.To overcome this problem, the program is made of natural stone sawmill waste utilization through science and technology to the Community (IbM), with a program of making handicrafts using the main raw material waste sawdust and splinters of natural stone. The program is implemented with the main objective to empower people to be able to cope with waste and create new jobs. The resulting product consists ofCrafts (handcraft),Flower Pot and Mosaic The first is the handcraft produced with the main ingredient as the matrix is resin apoxy 95%, hardener 3%, plus 2% cobalt, as inforcement used stone dust particle with variable best comparison is 50% matrix, and 50% particle inforcment. whereas the mold to make handcraft materials using RTV silicone rubber 586 plus hardener. Both produced flowerpot with the main ingredient of cement and sawdust stone cast coupled with hardener (hardener), where the best compositions based on test results is 15% cement an d 75% stone dust. The molds used are made of Fiber Glass and steel molds. The resulting third is a mosaic, made of stone flakes aggregate prepared using cement and wire mesh material as a binder and stone chips as forming ornaments. The mold using steel plate rectangular with size (20 x 20) cm. Of the three products produced, which has the best economic value is the Flower Pot, followed handcraft, while the mosaic has the lowest economic value","PeriodicalId":433636,"journal":{"name":"Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130837915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}