bluuebunny/crossref_metadata_2025 huggingface dataset:
ANALYSIS OF DOMAIN MONITORING AND EVALUATION COBIT MATURITY LEVEL IN GAME DEVELOPMENT COMPANY
Authors: Nastiti Putri , Widhiyanti Kathryn
Published: November 2021

There are many opinions that information technology governance is only suitable to be applied by large-scale companies. However this has not been proven to be true. Many small and medium-sized startups fail because they do not have good governance plans. This means that even small and medium-sized companies also need proper IT implementation planning. The purpose of this study was to measure the maturity level of information technology governance, particularly in terms of monitoring and evaluating IT performance, implementing internal controls, and compliance with company external regulations. Based on calculations, this game development company is at maturity level 3 (Defined Process). In addition, it was found that the biggest gap was in the Skill and Expertise attributes and the Goals and Measurement attributes. This study also provides recommendations for companies based on gap analysis in each process.
Komparasi Penerapan Kinerja Inverter pada Sistem Refrigerasi dengan Alat Ekspansi Jenis TXV dan Pipa Kapiler
Authors: Muliawan Rizki
Published: November 2021

Konsumsi daya listrik untuk sistem tata udara memiliki angka sekitar ± 60% dari total konsumsi energi listrik suatu bangunan, sama halnya dengan aplikasi pada sistem refrigerasi skala kecil domestik seperti lemari es (refrigerator) yang membutuhkan konsumsi yang tidak sedikit. Terdapat beberapa alat kontrol kendali maupun equipment device yang dapat dipergunakan sebagai teknologi penghematan diantaranya Inverter. Teknologi inverter akan coba diaplikasikan pada sistem refrigerasi kompresi uap dengan dua variasi metering device yang berbeda yaitu Thermostatic Expansion Valve (TXV) dan pipa kapiler (capillary tube). Metode penelitian yang akan dilaksanakan diawali dengan kajian teknologi refrigerasi kemudian dilanjutkan secara lebih mendalam pada teknologi inverter, dan metering device yang saat ini berkembang. Alat kemudian dirancang bangun lalu di uji coba hasilnya. Dari hasil penelitian didapatkan COP TXV lebih besar dari pipa kapiler sebesar 3,97 berbanding 2,77 dan efisiensi yang dihasilkan menggunakan TXV lebih tinggi yaitu sebesar 78,95% sedangkan dengan pipa kapiler 75,42%. Daya listrik dengan memakai TXV dan kapiler berturut-turut 352 Watt dan 242 Watt. Temperatur kabin dan produk dapat dicapai dalam waktu 35 menit untuk TXV dan 105 menit untuk kapiler. Hasil penelitian dapat disimpulkan kinerja sistem lebih baik menggunakan inverter dengan katup ekspansi jenis TXV.
Peluang Penghematan Energi pada Boiler di PT Indo Bharat Rayon
Authors: Hernawan Kholiq
Published: November 2021

Boiler adalah suatu bejana tekan dimana air/fluida dipanaskan oleh gas hasil pembakaran. Uap yang dihasilkan digunakan untuk berbagai proses. Boiler juga merupakan pesawat konversi energi yang mengubah energi dari pembakaran menjadi energi yang terkandung dalam uap. Audit boiler bertujuan untuk mengidentifikasi adanya peluang penghematan energy, yang bisa diketahui dari parameter efisiensi. Perhitungan terhadap efisiensi boiler biasanya menggunakan metode langsung dan metode tidak langsung. Perhitungan efisiensi menggunakan metode ASME PTC 4.1. Metode langsung merupakan perhitungan efisiensi boiler secara cepat, hanya membandingkan energy output dengan energy input, sedangkan metode tidak langsung merupakan perhitungan efisiensi boiler dengan memperhitungan rugi rugi atau energy panas yang hilang. Berdasarkan hasil pengukuran dan perhitungan didapatkan efisiensi dengan metode langsung sebesar 80,35 %, sedangkan berdasarkan metode tidak langsung didapatkan efisiensi sebesar 79,68 %. Jika nilai efisiensi tersebut dibandingkan dengan spesifikasi efesiensi boiler sebesar 86,3 % maka performansi /efisiensi boiler tesebut sudah mengalami penurunan. Untuk meningkatkan efisiensi boiler tersebut dengan memperbaiki system pembakaran agar mencapai pembakaran sempurna. Untuk mendapatkan pembakaran sempurna dengan memasang Combustion Optimizer. Setelah dilakukan analisa kelayakan, pemasangan Combustion Optimizer layak dilakukan karena memberikan nilai NPV yang positif dan Break Even Point yang singkat ( sebesar 1,6 bulan) dan memberikan penghematan pertahun sebesar Rp 1.155.017.988,0. Investasi yang diperlukan untuk pemasangan Combustion Optimizer sebesar Rp 150 Juta.
Studi Perencanaan Turbin Air PLTMH di Sungai Cilaki
Authors: Maridjo Maridjo
Published: November 2021

Penelitian ini bertujuan untuk mengetahui potensi Sungai Cisitu di Garut apabila digunakan sebagai pembangkit listrik tenaga mikro hidro. Potensi yang diteliti meliputi: seberapa besar debit yang tersedia; mengetahui tinggi jatuh efektif efektif yang tersedia; mengetahui seberapa besar potensi daya listrik yang dapat dihasilkan dengan menggunakan PLTMH. Penelitian ini diawali dengan studi pustaka,untuk mengetahui hubungan head dan debit terhadap jenis turbin. Dilanjutkan studi potensi hidrolik ini berkaitan dengan lokasi wilayah DAS sungai Cilaki. Tahap berikutnya yaitu survey lapangan, untuk mendapatkan data lapangan. Hasil penelitian diperoleh head sebesar 60 m dan debit sebesar 2,33 m3/s. Berdasar Head dan debit yang diperoleh, jenis turbin yang digunakan adalah turbin Francis. Hasil rancangan dimensi turbin memiliki diameter keluaran runner (D3) sebesar 0,5772 m, diameter masukan runner (D1) sebesar 0,4690 m, lebar keluaran runner (H2) sebesar 0,2016 m dan lebar masukan runner (H1) sebesar 0,1431 m. Jumlah sudu pengarah yaitu sebanyak 12 buah dan diameter poros sebesar 95,75 mm. Daya poros yang dihasilkan sebesar 1090,56kW pada putaran 1000 rpm.
Uji Performansi Mesin A/C Split 1 PK Akibat Pengaruh Variasi Jarak Instalasi Outdoor-Unit Terhadap Dinding
Authors: Pramudantoro Triaji
Published: November 2021

Mesin Jenis A/C split adalah mesin pendingin ruangan dengan kapasitas yang relatif kecil sehingga banyak digunakan sebagai alat pendingin ruangan rumah tangga, apartemen atau ruangan kantor. Seringkali ditemui pemasangan outdoor unit yang secara sembarangan dan tidak memperhatikan aspek performansinya, sehingga mesin menjadi kurang dingin, temperatur kondensasi naik, tekanan kerja kompresor meningkat, akibatnya konsumsi daya listrik akan meningkat. Tujuan dari penelitian ini adalah untuk mengkaji bagaimana pengaruhnya terhadap performansi mesin A/C split apabila penempatan outdoor unitnya divariasikan jaraknya terhadap dinding, sehingga dari hasil kajian tersebut akan diperoleh jarak minimum pemasangan outdoor unit terhadap dinding agar dihasilkan performansi mesin A/C split yang optimum. Metoda yang dilakukan adalah dengan memasang sistem A/C split dimana pemasangan outdoor unit dapat digeser-geser jaraknya terhadap dinding, dimulai dari jarak outdoor unit 5 cm terhadap dinding, selanjutnya berturut turut 10 cm, 15 cm,20 cm,25 cm dan 30 cm.  Dari hasil kajian ini menunjukkan performansi yang baik adalah setelah jarak pemasangan outdoor unit terhadap dinding sekitar 20 cm dengan hasil chilling time lebih cepat (40 menit), tekanan discharge menurun (12%), kerja kompresi menurun (18%), efek refrigerasi meningkat (9%) dan nilai COP meningkat 30%. Sehingga dapat dikatakan jarak yang baik untuk pemasangan outdoor unit terhadap dinding adalah minimum 20 cm.
PERFORMANSI GENSET BENSIN 2000 W YANG DIMODIFIKASI MENJADI GENSET BERBAHAN BAKAR BIOGAS
Authors: Maridjo  , Tina Mulya Gantina  , M Taufiq Samudra
Published: November 2021

Biogass is one of energy alternative sources, produced from organic materials degradation in anaerob condition that has economically and availability advantages. This research had been conducted to convert biogass to electric power or as known as bio-electric which using a modified carburetor of gasoline genset converter. Biogas was produced from cow's manure fermentation, located at Giri Mekar Kecamatan Cilengkrang, Kabupaten Bandung. Methane (CH4) concentration was 40% from the biogass

with potential energy 43,5 MJ/kg. The result showed that genset with biogass as fuel could reach 989 W output of capacity with 2,95 x 10-4 kg/s of fuel consumption and 11,9% of maximum eficiency. Compare to gasoline as a fuel, the result showed l219 W output of capacity with 1,63 x l0-4 kg/s of fuel consumption and 17,2.'% of maximum. Therefore, to have same output of capacity a genset with biogass as fuel is more consuming than genset with gasoline as fuel.
PEMISAHAN GAS CO2 BIOGAS MENGGUNAKAN ALAT WATER SCRUBBER DENGAN VARIASI LAJU ALIR DAN TEKANAN BIOGAS
Authors: Tina Mulya Gantina  , Kartono  , Maridjo  , Arief Ardiansyah
Published: November 2021

Biogass is produced from fermentation of organic materials such as domestic waste and manure from animal husbandary. To increase the quality of biogass as a fuel, it has to be followed by the increasing of CH4 concentration. It could be done with seperating CH4 from other gases such as CO2. One of separation methode is using a water scrubber with water act as medium which as CO2 is more soluable to water than CH4. The result showed that CO2 absorption was increased followed by the increasing of the pressure and the biogass flow rate. The percentage of CO2 absorption at 2,5 m3 per hour of biogass flow rate and 8 bar was 4,6%, meanwhile it was 11,l% at 10 bar. In the other side, there was 9,5% of CH4 increasing at 10 bar. Therefore, CO2 separation from biogass using water scrubber at 10 bar is better than at 8 bar.
SISTEM PENGATUR GORDEN PADA LAMPU BERBASIS PLC
Authors: Hartono Budi Santoso  , Agoeng H Rahardjo  , Risa Utami Arsaf
Published: November 2021

When we leaving house in the empty situation which usually let the lamp on make wasting the energy we used and invited wickedness like robbing. Based on this situation the author create some device which give a savety when leaving house. Function of this device are to control curtain and lamp automatically. So we can spit people that

house not empty. The principle of this device is if user turn on the system with press the push button then at the sun rise curtain automatally open until the lamp will off, and the other way curtain will automatically close and lamp will be on at the sunset. The system consists of two subsystem: motor and railway curtain track. The whole system is

controlled by PLC type OMRON CPM 1A. LDR is a sensor to detect the light which places in out site room. Limit switch placed at the end of railway curtain track which used to stop the motor. After testing, we know that the system need 3 minutes for open the curtain and 5 minutes 20 second for close the curtain.
ANALISIS KUALITAS DAYA PADA SUPLAI DAYA LISTRIK PT. SOSRO
Authors: Energi Aceng Daud
Published: November 2021

In more than ten years, quality of electricity has growed from clearness to be an principal issue. One heavy problems from quality of power is harmonic distortion and its consequences. Particularly, the increasing of penetration of loads bases on power electronics (non-linear load) what creates a harmonic distortion in AC power systems. Then, quality of electricity becomes principal issue for utility and its consumer and both swiftly adopts philosophy and proposes limits in new international standard (IEC, EN, BS, IEEE). As consequence the equipments of power conditioning (converter) will become more important for electrical utility and its consumer. From the results with the data logger recording at PT SOSRO distribution feeder system found that there are several current and voltage harmonics are significant in the load and hence the supply side. Fifth and the seventh Harmonic are heaviest harmonic components in the current load. Installation of passive filters will be one solution to overcome the issue with the current harmonics. The recomendation proposed will be submitted to management for consideration PT SOSRO factory in determining which type of passive filter will be used.
PELUANG PENGHEMATAN ENERGI PADA BILLBOARD UKURAN SEDANG DAN BESAR SE-KOTA BANDUNG
Authors: Sapto Parjogo
Published: November 2021

Billboard is the type of outdoor advertising. For this reasonable effectiveness of the billboards were placed and selected on the road that has high traffic density. Furthermore, in order to attract attention, the billboard is equipped with powerful lights large enough to get eye catching effect. At certain hours of relatively low traffic density, so that the expected level of effectiveness of billboards as a function of promotion will also be decreased. In these conditions for reasons of energy saving light energy should be reduced or even turned off. The problem is what time the street has low traffic density. Based on these reasons, it is necessary to conserve energy on billboards as the city of Bandung by conducting a review the level of traffic density per hour and determine the feasibility level of energy use electricity for lighting

Billboards.
TEKNIK SWITCHING UNTUK KONVERSI ENERGI DC EFISIENSI TINGGI
Authors: S P Mursid
Published: November 2021

Konversi energi listrik DC dengan menggunakan konverter linier memiliki kelemahan utama yaitu hanya dapat mengkonversikan dari tegangan tinggi ke tegangan lebih rendah dengan disipasi daya relatif tinggi. Sampai saat ini beragam perangkat pengkonsumsi energi listrik, khususnya perangkat elektronik, misih banyak menggunakan konverter linier. Kelemahan pada konverter linier dapat diatasi dengan menggunakan teknik konverter switching. Kelebihan utama dari konverter switching adalah

kemampuannya untuk melakukan konversi tegangan DC dua arah yakni menaikkan tegangan dan juga menurunkan tegangan. Kelebihan penting lainnya adalah efisiensi konversi energi yang sangat tinggi. Dalam diskusi akan diberikan perbandingan peluang rugi - rugi pada konversi linier, konsep dasar konverter switching dan contoh merercanakan konversi energi listrik DC menggunakan konverter switching.
POTENSI PLTMH PADA FASILITAS BPT MILIK PDAM - SUATU STUDI KASUS DI PDAM KABUPATEN WONOGIRI
Authors: Wahyu Budi Mursanto
Published: November 2021

Sumber air minum untuk suatu kota atau daerah, banyak yang berasal dari sumber air yang berada di pegunungan. Dikarenakan letaknya yang cukup tinggi, untuk mengalirkan air tersebut pihak PDAM menggunakan pipa - pipa tertutup secara gravitasi. Jika jarak pengalirannya cukup jauh, maka pipa – pipa tersebut dilengkapi dengan Bak Pelepas Tekanan (BPT). Fungsi dari BPT adalah melepaskan energi air yang ada di pipa bertekanan agar tidak merusak atau memecahkan pipa. Pada penelitian ini akan dihitung potensi energi air yang ada pada suatu BPT untuk dimanfaatkan sebagai PLTMH. Sebagai studi kasus, dipilih salah satu BPT milik PDAM Kabapaten Wonogiri,  Jawa Tengah yang mempunyai fasilitas pompa sumur dalam yang digerakkan dengan motor listrik (14,92 kW) yang energi listriknya berasal dari genset diesel (23,87 kW). Air dari sumur dalamvtersebut digunakan untuk menambah pasokan air minum pada saat musim kemarau. Hasil penelitian memperlihatkan bahwa ditemukan solusi untuk menggantikan mesin genset diesel dengan PLTMH yang menggunakan turbin pelton maupun crossflow. Pemilihan penggunaan turbin crossflow untuk penelitian ini, karena turbin ini mampu memenuhi spesifikasi yang diinginkan, harganya lebih murah serta diproduksi secara lokal di lndonesia.
STUDI PEMAKAIAN DAYA SOLAR CELL-HYBRID OFF GRID GEDUNG LABORATORIUM ENERGI SURYA-JURUSAN TEKNIK KONVERSI ENERGI-POLBAN
Authors: Ignatius Riyadi Mardiyanto  , Alvera Apridalianti Melkias
Published: November 2021

Solar energy is a renewable source that has never been exhausted, this energy will not reveal pollution into environment such as another power plant. Solar Power Plant is one of renewable source that become on alternative source in the future. One of application of this system is Hybrid Solar Power Plant, this power plant it is use to accomplish electricity energy consumption in Solar Laboratory Energy Conversion Engineering POLBAN with benefitted solar energy as electricity energy soarce. Electricity of energy there is resulted dependent on high and low solar light intensity. This paper is analyzed for both of supply and demand electricity in Laboratory of Solar Energy - Energy Conservation Engineering Department-POLBAN.
OPTIMALISASI KINERJA AIRCONDITIONER WATER HEATER (AWH) DENGAN MENGATUR DIMENSI KOIL PEMANAS AIR
Authors: Ika Yuliani
Published: November 2021

Airconditioner Water Heater (AWH) adalah upaya pemanfaatan panas pada kondensor mesin AC dengan tidak mengurangi fungsi AC sebagai pendingin ruangan. Prinsip kerja dari sistern ini menggunakan siklus refrigerasi kompresi uap, yaitu pada sisi evaporator digunakan untuk mendinginkan ruangan sedangkan pada sisi antara kompresor dan kondensor dimanfaatkan untuk proses pemanasan. Salah satu parameter dari kinerja Airconditioner Water Heater (AWH) adalah menghasilkan waktu pemanasan air yang relatif singkat, yaitu kurang dari 3 jam dengan penurunan tekanan (DP) berada pada daerah yang aman atau dibawah 34 kPa. Optimalisasi kinerja sistem AWH dilakukan dengan mengatur dimensi pipa pemanas air yaitu panjang (L) dan diameter (D) pipa. Sebelum dilakukan optimalisasi sistem AWH dengan panjang pipa pemanas air l5 meter menghasilkan waktu pemanasan 2 jam 10 menit dengan DP sebesar 36 kPa. Hasil optimalisasi dengan metode perhitungan perpindahan panas diperoleh L = 13,57 menghasilkan waktu pemanasan air sebesar 2 jam 45 menit dan penurunan tekanan sebesar 24 kPa.
KONSEP DESAIN PEMBANGKIT LISTRIK TENAGA UAP MEMANFAATKAN SUMBER PANAS BERTEMPERATUR RENDAH DENGAN MEMAKAI SIKLUS RANKINE ORGANIK
Authors: Ignatius Riyadi Mardiyanto  , Dinny Niaty  , Ika Yuliani
Published: November 2021

Siklus Rankine Organik (ORC) menggunakan dua refrigran organik yakni R22 dan Rl34a dapat digunakan untuk mengkonversi panas dari sumber air panas bersuhu sekitar 80°C. Menggunakan air pendingin dengan temperatur 18°C, dengan R22 didapat efisiensi siklus sekitar 5%. Sedangkan jika menggunakan R134a akan didapat efisiensis siklus sekitar 6%. Untuk membangkitkan daya listrik sekitar 3 kW dapat menggunakan ORC dengan refrigran tersebut yang membutuhkan laju aliran air panas bersuhu 80°C sebesar 0,8 liter per detik.
ALIRAN DUA FASA LIQUID-GAS PADA PIPA HORIZONTAL DIAMETER 46 MM
Authors: Arya Wulung  , Antariksa Pebriani
Published: November 2021

Boiler merupakan alat yang berfungsi untuk memanaskan air menjadi steam. Pada saat boiler bekerja akan terbentuk gelembung uap air yang terkadang terperangkap dalam boiler, sehingga dapat mengurangi efisiensi suatu boiler. Dari contoh kasus tersebut, maka dengan pemahaman aliran dua fasa akan didapatkan parameter kualitatif dalam perancangan berbagai aplikasi yang menggunakan sistem aliran dua fasa, baik untuk sistem adiabatik maupun sistem dengan perubahan fasa seperti pada boiler dan  kondensor. Penelitian ini bertujuan membuat visualisasi gambar pola aliran pipa horizontal saat aliran dua fasa dalam pipa. Selanjutnya, mendeskripsikan bentuk - bentuk gelembung yang ditemukan dalam aliran dengan metode eksperimen. Hasil visualisasi pola aliran dua fasa pada kecepatan supervisial liquid (USL) dengan range yang sama USL 0,l93 meter per detik sampai 0,256 meter per detik untuk ke empat jenis aliran USG : 0,88 meter per detik sampai 1,7 meter per detik membentuk pola aliran bubble, pada USG : 1,7 meter per detik sampai 2,3 meter per detik membentuk pola aliran kantong, pada USG : 6,7 meter per detik sampai 8,7 meter per detik membentuk pola aliran strata gelombang dan pada USG : 3,2 meter per detik sampai 5,8 meter per detik membentuk pola aliran peluru. Namun, dalam eksperimen tersebut tidak ditemukan aliran gelembung gelang seperti yang telah disebutkan Weisman.
TEKNIK NATURAL SAMPLING PWM INVERTER TIGA LEVEL
Authors: I Made Wiwit Kastawan
Published: November 2021

Tulisan ini menampilkan bahasan tentang teknik natural sampling PWM untuk inverter diode clamped tiga-fasa. Teknik natural sampling PWM dengan komposisi sinyal carrier berbeda yaitu disposisi sinyal carrier (level-shifted) dan disposisi sinyal carrier dengan pergeseran fasa (phase-shifted) masing - masing untuk sinyal referensi sinusoidal dan sinyal referensi sinusoidal yang diinjeksi dengan gelombang harmonisa ketiga dibahas dan dilihat pengaruhnya terhadap unjuk kerja inverter diode clamped tiga-level tiga-fasa ditinjau dari sisi harmonisa gelombang atau riak arus keluarannya melalui simulasi. Hasil simulasi menunjukkan bahwa teknik natural sampling PWM level-shifted menghasilkan unjuk kerja inverter yang lebih baik jika dibandingkan dengan teknik natural sampling PWM phase-shifted.
PEMBERIAN PRA-PERLAKUAN (PRE-TREATMENT) PADA ECENG GONDOK SEBAGAI BAHAN BAKU DALAM PEMBUATAN BIOGAS
Authors: Purwinda Iriani
Published: November 2021

Pembuatan biogas merupakan salah satu upaya diversifikasi proses pengadaan sumber energi terbarukan yang saat ini pengembangan teknik dalam kombinasi bahan baku biomassa dan kotoran sapi masih terus dilakukan. Pada penelitian ini, dilakukan produksi biogas dengan tujuan mengukur pengaruh pemberian pra-perlakuan pada

eceng gondok terhadap potensi energi yang dihasilkan, dibandingkan pada eceng gondok yang tidak diberi pra-perlakuan (kontrol). Dilakukan dua jenis pra-perlakuan yaitu pra-perlakuan secara fisik (dengan menggunakan pengeringan alami oleh cahaya matahari) dan kimiawi (perendaman bahan baku menggunakan NaOH 3%). Bahan baku yang digunakan adalah campuran eceng gondok dan kotoran sapi dengan perbandingan komposisi 3:1. Pembuatan biogas dilakukan di dalam digester 19 L dengan  menggunakan fermentasi anaerob dengan sistem batch dengan waktu inkubasi selama 42 hari pada suhu ruang. Hasil penelitian menunjukkan bahwa nilai potensi energi paling tinggi diperoleh pada digester dengan pra-perlakuan kimia dengan nilai 1618,77 kJ per liter di hari ke-10, sedangkan pada digester pra-perlakuan fisik adalah 1146,22 kJ per liter di hari ke-6 dan pada kontrol adalah 1412,95 kJ per liter.
DAMPAK VIBRASI MEKANIK TERHADAP KONSUMSI LISTRIK MOTOR INDUKSI POMPA AIR PENDINGIN
Authors: Conny K Wachjoe  , Metius Zingiber Sianturi
Published: November 2021

Pompa air pendingin merupakan komponen pendukung vital pada pembangkit listrik tenaga air (PLTA), sehingga pompa air pendingin harus bekerja optimal setiap saat. Penggerak pompa air pendingin dihasilkan melalui motor listrik. Pada sistem pompa air dengan kapasitas besar, motor dan pompa air terhubung dengan poros kopling agar selalu lurus (align) antar ke duanya. Keausan pada bearing dan dudukan motor dan pompa akibat putaran akan meningkatkan vibrasi mekanik. Energi mekanik yang  dibangkitkan motor listrik ke pompa air dipengaruhi oleh tingkat vibrasi mekanik yang timbul. Dampak vibrasi mekanik terhadap kinerja motor listrik kapasitas I50 kW dicermati melalui studi kasus yang dilakukan pada Unit I PLTA Cirate. Metode pengamatan dilakukan melalui perangkat vibration analyzer terpasang dibandingkan dengan standar vibrasi mekanik ISO 10816-3. Dampak vibrasi mekanik terhadap umur mesin dan konsumsi energi listrik didekati berdasarkan pendekatan empirik pada kondisi misalignment antara motor dan pompa air. Dampak vibrasi mekanik terhadap umur mesin menunjukkan bahwa motor listrik masih dapat dioperasikan selama 15% dari umur mesin normal pada kondisi vibrasi mekanik maksimum dengan total offset sebsesar 1,0 mm per sekon. Sedangkan, dampak vibrasi mekanik terhadap konsumsi

energi motor listrik meningkat sebesar 6,92% pada konsumsi energi sebesar 122 kW pada total offset vibrasi mekanik sebesar l,61 mm per sekon.
PENGARUH PENGGUNAAN LARUTAN NaOH 1% PADA PRA-PERLAKUAN ECENG GONDOK UNTUK PRODUKSI BIOGAS
Authors: Purwinda Iriani  , Akmalurijal Asyipa
Published: November 2021

Biogas merupakan salah satu bahan bakar terbarukan yang dapat diproduksi dengan berbagai bahan baku biomassa. Salah satu sumber biomassa yang ketersediaannya

berlimpah yaitu eceng gondok, mempunyai kandungan polisakarida berupa selulosa dan hemiselulosa cukup.tinggi, sedangkan produksi biogas membutuhkan bahan baku dengan kandungan polisakarida yang rendah. Metode pemecahan ikatan polisakarida menjadi monomer - monomernya menggunakan metode hidrolisis alkali. Produksi biogas dilakukan dengan menggunakan sistem fermentasi tipe batch secara anaerob.. Digester biogas berkapasitas 19 L dengan pra-perlakuan menghasilkan persentase CH4 paling tinggi yaitu 34,12%, dibandingkan dengan tanpa pra-perlakuan (29,77%). Total potensi energi yang dihasilkan pada produksi biogas dengan pra-perlakuan (94 kJ), dimana lebih besar 90,16% dari tanpa pra-perlakuan ( 49,43 kJ).
DEPENDENT DAN INDEPENDENT SPEAKER UNTUK KONTROL PERALATAN RUMAH TANGGA MELALUI PENGENALAN WICARA
Authors: Sri Utami
Published: November 2021

Konsumsi energi dapat dikurangi, salah satunya dengan pengontrolan dan monitoring peralatan rumah tangga setiap waktu. Pengontrolan akan lebih efektif bila bisa  dilakukan setiap saat dan melalui pengenalan wicara. Pengenalan wicara diimplementasikan untuk mengontrol dan memonitoring perlatan rumah tangga jarak jauh. Proses kontrol dilakukan dari PC client ke PC server. Sistem ini menpunyai input berupa dependent dan independent speaker. Independent speaker digunakan untuk mengetahui sistem bisa bekerja untuk speaker yang bukan merupakan speaker standar. Proses yang digunakan dalam penelitian ini adalah pengambilan sinyal, sampling frame, windowing, LPC (Linear Prediction Code). Proses - proses tersebut dinamakan sebagai proses ekstraksi. Setelah itu dilakukan proses Dynamic Time Warping (DTW) untuk memadamkan sinyal masukan dengan sinyal standar. Proses ekstraksi dan Dynamic Time Warping dilakukan pada PC client, hasilnya dikirim ke server untuk mengontrol alat yang diinginkan. Setelah alat terkontrol, perangkat keras akan memberikan feedback ke PCserver kemudian mengirimkannya ke PC client. Di PC client dapat diketahui kondisi peralatan yang dikontrol. Alat yang dikontrol adalah empat buah lampu. Sistem yang dibangun mempunyai prosentase keberhasilan rata - rata l00% dependent speaker (pengucap yang suaranya dipakai sebagai standar) dan prosentase keberhasilan rata - rata 7l,88% untuk independent speaker (pengucap yang suaranya tidak dipakai sebagai standar).
RANCANG BANGUN SMART ROOM BERBASIS ATMEGA32
Authors: Wahyu Budi Mursanto  , Yuri Manggala Prana
Published: November 2021

Sistem "smart room" berbasis atmega32 adalah alat yang berfungsi sebagai pengendali sistem penerangan dan temperatur suatu ruangan. Tujuan dari sistem smart room ini adalah untuk mempermudah sistem pengontrolan penerangan dan temperatur berbasis otomatisasi sistem. Untuk mendeteksi intensitas cahaya, digunakan sensor Light Dependent Resistor (LDR), untuk mendeteksi keberadaan manusia menggunakan sensor Passive Infrared (PlR), dan untuk mendeteksi temperatur dan kelembapan udara menggunakan sensor SHTI0. Informasi dari sensor-sensor tersebut kemudian diperoses dan digunakan sebagai kendali ­on - off lampu dan kipas otomatis. Pengolahan data - data intensitas, keberadaan manusia, temperatur dan kelembapan dilakakan oleh mikrokontroller ATMEGA32. Metode yang diganakan dalam pengendalian lampu berdasarkan gerbang logika AND dari output sensor LDR dan PIR, sedangkan untuk mengendalikan temperatur menggunakan kipas angin berdasarkan inputan dari SHT10.
Pengaruh Receivable Turnover dan Working Capital Turnover terhadap Profitability pada Perusahaan Farmasi yang Terdaftar di BEI Periode 2014-2018
Authors: Maisa Salma , Tripuspitorini Fifi Afiyanti , Masli Lili
Published: November 2021

This final project research is aimed to determine the effect of RTO and WCTO on ROA on pharmaceutical companies listed on the Indonesia Stock Exchange (IDX) period 2014-2018 period. The techniques are used in this research is Purposive Sampling and obtained 7 Pharmaceutical Companies on the IDX which were used as research samples. Secondary data are used  in the form of company annual financial statements. The research method used are descriptive and quantitative research. The test is done by panel data regression method which is processed using eviews 10. The selected panel data regression method is the Fixed Effect Model. The results showed that simultaneously RTO and WCTO had a significant effect on profitability (ROA) of pharmaceutical companies listed on the IDX. The partial results showed that RTO had a significant negative effect on profitability (ROA) while WCTO had no significant effect on profitability (ROA) for pharmaceutical companies listed on the IDX.
Perbandingan Return dan Risiko Saham Subsektor Perbankan dengan Subsektor Property Real Estate yang Terdaftar di BEI
Authors: Awala Ladysa , Djuwarsa Tjetjep , Danisworo Dimas Sumitra
Published: November 2021

The Indonesia Stock Exchange (IDX) noted the rise investors during 2019. In addition, some of the sector on the market capital shows the rapid development. It can be seen from a stock transactions. However, the developments is not indicate the return and risk of every sector. This research aims to determine differences in return and risk of stock between banking subsector and property, real estate subsector on the period 2019. The data used are secondary data obtained from Indonesia Stock Exchange and Id Investing. The research sample used was of 16 (sixteen) companies stock in the banking subsector and 14 (fourteen) companies stock in the property, real estate. This study used the Mann Whitney Test using SPSS version 24 software as analysis tool. The result of this research shows that there is no significant difference return and risk between banking subsector and property, real estate subsector.
Pengaruh Total Assets Turnover dan Current Ratio terhadap Return on Assets pada Perusahaan Properti dan Real Estate di BEI (2014-2018)
Authors: Arsyanti Hanna , Tripuspitorini Fifi Afiyanti , Djatnika Djoni
Published: November 2021

The research in this final project was toi know and analyze The Effect of Total Assets Turnover and Current Ratio to Return On Assets in Property and Real Estate Companiesl on the Indonesian Stock Exchange in the periode 2014-2018. The type of data used is secondary data in the form of the company’s annuall financial statement. In the research, there are 7 Property and Reall Estate Companies on the Indonesia Stock Exchangei which are sampled research. The research method used is descriptive and quantitative research. The test is done by panel data regression which eviews 10. The selected panell data regression method is Fixed Effect Model. The research result show that Total Assets Turnover has a positive impactt to Return On Assets and Current Ratio has not impact to Return On Assets. Total Assets Turnover and Current Ratio have a simultaneous effect to Return On Assets.
Pengaruh Dana Pihak Ketiga dan Non-Performing Loan terhadap Penyaluran Kredit pada Bank yang Terdaftar di BEI
Authors: Hutahaean Popy Sandra Tesalonica , Setyowati Diharpi Herli , Juniwati Endang Hatma
Published: November 2021

The purpose in this research was to find the effect of third party funds and non-performing loans on the amount of lending to banking sector listed on the Indonesia Stock Exchange for the period 2014 to 2018. The research method used is quantitative descriptive method. The data used are secondary data in the form of annual financial reports, and the data analysis technique uses multiple linear regression analysis. The data processing in this study used a statistical tool, namely E-views 9. The results of this study indicate that partially third party funds have a positive and significant effect on the amount of lending and non-performing loans have a negative and significant effect on the amount of credit disbursement. Simultaneously or together, third party funds and non-performing loans have a significant effect on the amount of lending.
Pengaruh Debt to Asset Ratio dan Debt to Equity Ratio terhadap Return on Equity pada Perusahaan Properti dan Real Estate
Authors: Septiyani Yunita Rizka , Kristianingsih Kristianingsih , Mai Muhamad Umar
Published: November 2021

The purpose of this research is to determine the Effect of Debt to Asset Ratio (DAR) and Debt to Equity Ratio (DER) to Return On Equity (ROE) of property and real estate companies listed in IDX for 2013-2017 both simultaneously and partially. The used research methods are descriptive and quantitative approaches, with secondary data using IBM SPSS Statistics 23 application tool. There are 40 sample data choosen by purposive sampling. Based on the results of the F test simultaneously Debt to Asset Ratio (DAR) and Debt to Equity Ratio (DER) have a significant effect on Return On Equity (ROE). Based on hypothetical testing, the t test bring the result that debt to asset ratio (DAR) has an insignificant effect on return on equity (ROE) variables and Debt to Equity Ratio (DER) has a significant effect on Return on Equity (ROE) variables on property and real estate companies listed in IDX.
Pengaruh Modal Kerja Terhadap Net Profit Margin pada Industri Makanan dan Minuman yang Terdaftar di BEI
Authors: Anggiyani Karunia Putri Augustina Dwi , Pratiwi Leni Nur , Laksana Banter
Published: November 2021

The aims of this research are to analyze the effect of Working Capital Turnover, Inventory Turnover, Cash Turnover, Receivables Turnover, and Short-term Debt to Net Profit Margin (NPM) at food and beverage industry listed on BEI (Indonesia Stock Exchange) Period 2017-2019. This research is using purposive sampling method and obtained a sample of 6 companies. The analysis used to determine the effect of Working Capital Turnover, Inventory Turnover, Cash Turnover, Receivable Turnover, and Short-Term Debt on Net Profit Margin (NPM) is a statistical analysis with using the help of SPSS 22.0 software. The results of this study indicate that the Working Capital Turnover, Inventory Turnover, Cash Turnover, Receivable Turnover and Short Term Debt variables simultaneously have a significant effect on Net Profit Margin (NPM). Working Capital Turnover, Inventory Turnover and Short-term Debt partially have a negative effect on NPM. Receivables turnover has a positive effect on NPM. whereas, cash turnover does cash turnover does not have an effect on NPM.
An Analysis of Language Teachers’ Beliefs in Their Teaching Learning Process
Authors: Handiani Dini
Published: November 2021

Language teachers play a very important part in language education and learning. What they do in classroom is a reflection of what they know and believe about issues related to their professional practices. Their knowledge and beliefs provide them with the underlying framework guiding their teaching learning process related to the content, approach, and evaluation of teaching and learning. The objective of this paper, therefore, was to examine the beliefs of language techers in teaching learning process. Based on the discussions and conclusions, it is recommended that the English language teachers  need to have clear  beliefs about their teaching learning process, and be very much willing to improve the language pedagogy through self-reflection/self-study. Key words: teaching learning process, beliefs
SPEECH ACT EXPRESSIONS IN THE ADVERTISEMENTS ON TELEVISION: A Case Study of Three Advertisements Both Food & Health Products and Cell-Phone Provider
Authors: Halim Puspita
Published: November 2021

The study entitled “Speech Act Expressions in the Advertisements on Television: A Case Study of Three Advertisements Both Food & Health Products and Cell-phone Provider” seeks to illuminate the types of speech acts based on Searle (1979) and the approaches of advertisements proposed by Book and Schick (1996). This study mainly uses a qualitative method to analyze the collected data in this research. The data sources are in the form of verbal texts, namely, statements of the speaker’s dialogue and narration both Food & Health Product and cell-phone provider advertisements. These advertisements were taken from several private TV stations aired during 1st March – 30th April 2010. The three advertisements were selected and categorized into four styles, namely, dramatizations, demonstrations, presentations, and testimonials. These commercials were classified into three tones, namely, factual, emotional, and humorous. Furthermore, the research was conducted to investigate the types of speech acts expressed in these different styles and tones of advertisements, namely representatives, directives, commissives, expressive, and declaratives. The study has discovered three tones within testimonial, demonstration, and presentation styles.  Furthermore, it has exposed one emotional tone within presentation style.  And two factual tones within testimonial and demonstration styles. This research has obtained linguistic notion and comprehension for students who are engaged in learning speech act expression in several utterances, mainly advertisements. Keywords: speech act, advertisement, style, tone
A PRAGMATIC ANALYSIS OF THANKING STRATEGIES AMONG INDONESIAN EFL LEARNERS BASED ON SOCIAL STATUS AND SOCIAL DISTANCE
Authors: Kustini Siti , Sulyaningsih Iis
Published: November 2021

This study attempts to investigate thanking strategies used by Indonesian EFL learners based on contextual factors i.e. social status and social distance. The participants were 50 semester three students studying English for Business at a state polytechnic in Bandung. The participants were both male and female, aging from 19-20 years old. Data were collected via a Discourse Completion Task (DCT) adopted from Cheng (2005) and analyzed using thanking strategy taxonomy proposed by the same author. The DCT consisted of ten different scenarios describing the most common situations that students may encounter in their college life. The results of this study indicated that the most preferred thanking strategies used by Indonesian EFL learners were thanking, alerters (i.e., title) and positive feelings.  In terms of social status and social distance, the findings revealed that thanking and apology strategies were the most used strategies in equal-status with low-familiarity situations.  In situations within which learners shared equal-status with high-familiarity, the most strategies employed were thanking and positive feelings. Regarding thanking strategies used in low-status with low-familiarity situations, thanking and repayment strategies seemed to be the most preferred ones.  Keywords: thanking, strategies, social status, social distance
AN ANALYSIS OF TRANSLATION OF IDIOMS USED IN CONAN DOYLE’S NOVEL “A STUDY IN SCARLET”
Authors: Agoes Farida
Published: November 2021

The article is about an analysis of translation of idioms in the novel by Conan Doyle entitled A Study in Scarlet. Translating idioms is often problematic for a translator because idioms are specific to a single language and rarely have the equivalent in other languages. Therefore, this study was conducted to find out the types of idioms used in the English version of the novel, to find out the strategies used by the translator of the Indonesian version of the novel in translating the English idioms, and to find out the accuracy, acceptability and readability of the translation of the idioms in the novel. In analysing the idioms and their translation, qualitative method was used, and the theories by Fernando (1996), Baker (2011) and Nababan, Nuraini, and Sumardiono (2012) were also used. The finding of the analysis shows that from 60 idioms found, semi-idiom is the type of idioms which is frequently found in the novel (31 idioms or 52%). Besides, it is revealed that translating the idioms by paraphrasing is the strategy which is mostly used by the translator in translating the idioms (38 idioms or 63%). In addition, it is revealed that the translation of idioms in the novel is accurate and acceptable although it is less readable. So, the quality of translation of idioms in the novel is good although it can be still improved.Keywords: accuracy, acceptability and readability of translation, idiom, translation, translation strategies
ANALISIS KUALITAS TERJEMAHAN ARTIKEL MEDIA OLEH MAHASISWA PRODI D-3 BAHASA INGGRIS POLITEKNIK
Authors: Sutantohadi Alief
Published: November 2021

This qualitative–inductive research is conducted to identify and describe the translation technics used by the students of D-3 programe of English Department of State Polytechnics of Madiun in translating the articles from The Jakarta Post daily newspaper. This research will also analise the the quality of  translation  result  and  its  relationship  with  the students’  competence  in  translation.  The  data  in  this research will be analised by using Content Analisis from Spradley. By using this technic, the data will be analised through some steps as domain analysis, taxonomic analysis, componential analysis and taking the cultural findings.  The result of the quality assesment of translation shows that the students’ competence in translation is adequate. This achievement is based on the result of assesment on the accuracy and the acceptability of the translation. The assesment on the accuracy of the translation shows from total 105 data were translated accurately for 66 data (62.86%) and then 21 data (20%) were translated less accurately     and  the  rest  for  18  data  (17.14  %)  were translated inacurately. The assesment result on acceptability of the translation shows from total 105 data were translated acceptable for 73 data (69.52%) and then 20 data (19.05%) were translated less acceptable and the rest for 12 data (11.43%) were translated unacceptable.Key Words    : the quality of translation, translation technique.
THE INVESTIGATION OF INDONESIAN EFL LEARNERS’ ERRORS ACROSS THREE PROFICIENCY LEVELS
Authors: Saudin Saudin
Published: November 2021

The study analyzed the errors made by students across three different levels of proficiency (Advanced, Intermediate and Elementary) in their writing pieces. Three students were selected purposively to represent their respective level. So, nine pieces of writing altogether were to be investigated in this study. The errors committed by the purposive samples were first grouped into fifteen linguistic classifications such as verb form, preposition, mechanics and so forth, then subsumed under two broader categories: negative interlingual and intralingual transfer. The investigation revealed that the learners made more errors of intralingual transfer than those of negative interlingual one. However, in terms of errors based on the linguistic classifications, this study showed surprising findings. Advanced learners, though committing the least errors, performed worst by making errors in the most linguistic classifications (seven altogether): plural-singular form, omission of constituent, verb form, article, vocabulary, pronoun and comparative. Intermediate learners came next by committing errors in less number of linguistic areas (five), namely mechanics, preposition, derivative, auxiliary verb and clause formation. Elementary learners came last by giving poor performances on the least number of just three linguistic areas: tense, word order and genetives. Across levels, however, three areas (consecutively mechanics, plural/singular form and omission of constituent) appeared to be where errors were most commonly committed. With findings as such, the study is expected to impart theoretical contributions to SLA, especially to studies on error analysis. The findings hopefully can also inspire teachers to teach students of these three proficiency levels in ways that meet their needs more. Keywords: purposive samples, linguistic classifications, negative interlingual tranfer, intralingual transfer, SLA.
The effectiveness of Washback for Learning Activities for Vocational Studies: A study of Language Assessment in an Indonesian Polytechnic
Authors: Fadillah Nurul
Published: November 2021

Regarding the importance of English for international communication, Indonesian government set up the regulation and included English in the curriculum for schools. English accordingly should be taught from junior high school to university level. Some primary schools in Indonesia even put English as their optional subject beginning in the third year. The regulation may lead to the improvement of human resources especially in education sector because the government believes that will develop national prosperity. In addition, it is also important to improve educational subjects (person who take part in education) for instance teacher, students, academics, etc to maintain the quality in educational sector. The research discusses the effectiveness of using washback to introduce the use of test influences on language teachers and learners activities in the classroom and also examine the concept of washback and language assessment as the instances of the consequential aspect of validity, authentic and direct assessment and difficulty in the test. Keywords: washback, assessment, effectiveness, validity, education, test
Students’ Self Revision in Essay Writing
Authors: Febryanto Mohammad
Published: November 2021

This study investigates self-revision in essay writing conducted by 6 students. The analysis is based ondetermining common revised errors. The data have been reduced based on Language Related Episodes (LREs). The result shows that there are revision consisting of 1 change in punctuation both in first and second essay, 5 changes spelling in first essay, 19 changes vocabulary in the first essay and 6 changes in second essay, 25 changes in word form correction in the first essay and 27 changes in the second essay, and there are 19 changes in sentence level the first essay and 13 changes in the second one. This indicates that the self-revision is predominantly focused onthe word level changes particularly in morphology. Keywords: self-revision, common revised errors, Language Related Episodes (LREs)
The Language of Classification in Accounting Texts in the Framework of SFL
Authors: Sembiring Bahtera
Published: November 2021

This paper reports the study of language of classification on accounting texts using the Systemic Functional Linguistics (SFL) framework. It focuses on how language of classification is realized structurally on a such text. The studies conducted by Wignell, Martin and Eggins (1993) focusing on physical geography texts and Khorina, Suyatna and Indira (2017) concerning with electronics engineering texts, identified that classification was realized either by intensive or possessive relational process clauses working on attribute mode. In relation to the prior studies, the data were collected from two accounting textbooks used as references by the students of Accounting Department at PoliteknikNegeri Bandung (Polban). Both of the types of relational process clauses were found in the texts consisting of 14 clauses classified as intensive and 17 belonging to possessive ones. Both types of the clauses contain attributive relational process. The attributive relational process occuring in intensive relational process clauses is realized solely by verb be. However, the relational process which appears in possessive relational process is realized by several verbs which are break, classify, consist, divide, and include. The implication of this study is not only for modelling English grammar of Accounting texts, but also for translation study.Key words: SFL, classification, intensive relational process clause, possessive relational process clause