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E-Journal Aptek
ISSN : 20852630     EISSN : -     DOI : -
Jurnal Aptek diterbitkan dengan maksud untuk mengumpulkan artikel ilmiah dari penelitian, makalah, inovasi, prosiding seminar dan konsep ilmu pengetahuan dalam bidang teknik sipil dan teknik mesin atau yang relevan, kemudian mempublikasikan artikel tersebut. Jurnal APTEK terbit 2 kali dalam setahun pada bulan Januari dan Juli. Isi artikel yang di muat bukan cerminan sikap dan/atau pandangan redaksi. Seluruh Isi artikel menjadi tanggung jawab penulis.
Articles 212 Documents
KAJIAN EXPERIMENTAL TENTANG UMUR PERAWATAN BETON MEMAKAI LEMBARAN PLASTIK DITINJAU TERHADAP KUAT TEKAN BETON -, Azhari; -, Suprasman; Gusyafri3, H; Putra, Dedy Irawan
E-Journal Aptek Vol 4, No 2 (2012)
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Di antara faktor yang mempengaruhi kuat tekan beton adalah perilaku pasca pembetonan yakni ada/tidaknya perawatan beton dan bagaima perawatan itu dilakukan. Perawatan beton dimaksudkan sebagai upaya menjaga keberlangsungan proses hidrasi semen dengan air menjadi pengikat agregat sampai waktu tertentu. Kehilangan air saat proses hidrasi ini dapat mengurangi mutu beton, terutama kuat tekan beton. Sementara itu di lapangan (pada proyek-proyek yang kurang pengawasan) sering ditemui - terutama pada kolom - setelah cetakan dibuka (dengan umur pembukaan yang bervariasi), beton dibiarkan begitu saja tanpa perawatan. Penelitian ini mengkaji sejauh mana variasi perlakuan perawatan pasca pembetonan mempengaruhi kuat tekan beton. Untuk itu dibuat benda uji beton berupa silinder dengan memvariasikan umur perawatan (dengan cara menutup beton dengan plastik) setelah cetakan dibuka, yakni 1 hari, 3 hari, 7 hari, 14 hari, 21 hari, dan 28 hari. Selain itu dibuat benda uji dengan perawatan standar sebagai pembanding. Penutupan beton dengan plastik ini dimaksudkan sebagai alternatif perawatan beton. Hasil penelitian didapat kurva hubungan umur perawatan dengan kuat tekan beton berupa persamaan polynomial y = -0,002x2 + 0,201x + 18,67 yang menunjukkan bahwa semakin lama perawatan beton semakin meningkat kuat tekannya, atau sebaliknya dapat dikatakan semakin berkurang umur perawatan beton semakin berkurang pula kuat tekannya.
EXPERT SYSTEM UNTUK MENDIAGNOSA PENYAKIT TANAMAN BUAH BERBASIS WEB Hutahaean, Jeperson; Siagian, Yesica; Pasaribu, Eva Solita
Jurnal APTEK Vol 7, No 1 (2015): APLIKASI TEKNOLOGI
Publisher : Universitas Pasir Pengaraian

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Along with the rapid technological advances, delivering information on the diseases of agricultural crops with internet media is very necessary that involves the user in determining the information to be obtained. Information systems based expert systems (expert systems) is areference provider of more accurate information and clearly easier to   diagnose a disease symptom of the data found in the field. Expert System is a system that is trying to adopt human knowledge to computer, so that the computer can resolve the problem as was done by experts or specialists. With information-based expert systems, even the common people, can solve problems that are quite complex, which is actually only be solved with the help of experts. Programming expert systems is one of the software (software) used in the field of science and technology research. Basically science expert system can also be used to analyze the facts in the research (Research Fact).
PENGARUH PENGGUNAAN MEDIA PENYERAP GAS BUANG PADA ALAT PENGENDALI PENCEMARAN UDARA UNTUK KENDARAAN BERMESIN DIESEL Subekti, Purwo
E-Journal Aptek Vol 1, No 1 (2009)
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Air pollution that was caused by motorized vehicle, which came from the emission of the vehicle, has produced bad impact on human health. This study has objectives to study the effect of the application of air pollution control device, whice was equipped with fiber optic, glass wool and active carbon, to emission of diesel motor vehicles. That control device was place on Mitsubishi Colt Diesel PS 100 car.The results of this study has indicated that air pollution control device that used fiber optic, glas wooll and active carbon component had the best performance to absorb Diesel motor vehicle’s emission. It could be seen by the reduction of O2 value, the reduction of CO2 value and smoke, whereas HC was not performed.
ANALISA DEBIT ALIRAN FLUIDA TERHADAP EFEKTIFITAS RADIATOR PADA ENGINE MOBIL MAZDA -, Nazaruddin; -, Yuliani
E-Journal Aptek Vol 5, No 1 (2013)
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Penelitian ini bersifat eksploratif yang bertujuan untuk melihat fenomena atau keadaan tertentu. Model analisis yang diambil ialah dengan mengumpulkan data, kemudian data yang bersifat kuantitatif diproses dengan cara diklasifikasikan dan dihitung dengan menggunakan suatu rumus terapan. Penelitian ini dilakukan dengan tujuan membuktikan adanya pengaruh debit aliran air terhadap efektifitas pendinginan radiator dan menghitung seberapa besar pengaruh yang terjadi antara debit aliran air tersebut terhadap efektifitas radiator. Simulator penelitian ialah sebuah engine stand dari mesin mobil Mazda yang didalamnya terdapat beberapa alat instrument pengukur yang saling berhubungan.Untuk dapat menghasilkan data hasil pengukuran, komponen – komponen dan alat ukur yang diperlukan antara lain engine, radiator, kipas, motor listrik, pompa air pendingin, flowmeter, thermometer, selang radiator, anemometer, tachometer, stopwatchdan regulator. Data penelitian efektifitas radiator untuk pengambilan suhu ukur dengan penahanan (holding time)selama 30 menit, dengan rincian pembagian (1, 5, 10, 15, 20, 25, 30) menit. Untukputaran mesin (1000, 1100, 1200, 1300, 1400) rpm..Berdasarkan hasil percobaan, pengujian dan analisis data dapat kesimpulan bahwa Pengambilan data pengujian pada menit pertama terlihat bahwa debit air yang semakin tinggi menjadikan nilai efektifitas radiator semakin meningkat, sehingga dikatakan dengan kata lain bahwa debit aliran air berpengaruh terhadap nilai efektifitas radiator. Debit yang semakin tinggi ini dikarenakan putaran mesin yang semakin tinggi sehingga menjadikan penyerapan kalor menjadi semakin maksimal. Hal ini ditandai dengan peningkatan suhu dibelakang radiator, peningkatan suhu tersebut menjadikan nilai efektifitas semakin tinggi.Pengambilan data pengujian untuk pengambilan suhu ukur dengan penahanan (holding time)selama 30 menit terjadi peningkatan nilai efektifitas yang seimbang, sesuai dengan kenaikan debit aliran air, ini menunjukkan adanya kestabilan nilai efektifitas radiator. Kestabilan nilai efektifitas ini merupakan suatu hal yang wajar karenabila diamati kenaikan suhu ukur terjadi merata pada parameter suhu air yang keluar dari mesin, suhu air yang keluar radiator masuk ke mesin dan suhu udara di belakang radiator, sehingga akan menyebabkan besaran nilai efektifitas radiator akan cenderungstabil.
RANCANG BANGUN KETEL UAP MINI DENGAN PENDEKATAN STANDAR SNI BERBAHANBAKAR CANGKANG SAWIT UNTUK KEBUTUHAN PABRIK TAHU KAPASITAS 200 KG KEDELAI/HARI Hakim, Legisnal; Subekti, Purwo
Jurnal APTEK Vol 7, No 1 (2015): APLIKASI TEKNOLOGI
Publisher : Universitas Pasir Pengaraian

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Boiler in the tahu industry is a support tool in the processing tahu, it is became the most important part to improve the productivity of processing out in the small, medium and large industry at the tahu factory. But most  small and medium tahu industry, for production, still use simple boiling equipment, made of drums and no specification of the technical, which is far from standard and safety. Pusrpose of this research is to produce technical specifications and material selection and proper boiler is expected to draft boiler mini approaching ISO standard. This design is also adapted to the election and the corresponding fuel consumption in the study area and easily obtained, namely palm shell, which has a chemical composition, among others: palm shells of 61.34%, 3.25% hydrogen, 31.16% Oxygen, Nitrogen 2, 45%, Abu 1.8% and the value of fuel oil palm shell is LHV 18034.56 kJ / kg, HHV 21274, 56 kJ / kg.
ANALISIS KINERJA JARINGAN JALAN KOTA BANDUNG SETELAH BEROPERASINYA FLYOVER PASUPATI DAN FLYOVER KIARACONDONG Lumba, Pada
E-Journal Aptek Vol 1, No 1 (2009)
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To overcome congestion in the center of Bandung Pasupati and Kiaracondong Flyover are built. In the relation with that conditions this research has main purpose to investigate the traffic pattern after the Flyovers are operated and the investigation concern with the prediction of traffic pattern for the next 5 years and therefore the best solution can be found out.In this reseach basic model was assumpted of conditions of 2005. Developing the road network is first step in TFTP 97 Program, it should be suitable real field condition, include certain of centroid that are start and end of the journey. Input land use in TFTP 97 Program in this model is used trip generation data showing the number of journey demand, and next step is to run the road network.The results of running TFTP 97 Program for existing condition, scenario 1, scenario 2 show number of road around of Flyover have traffic density above 0.75 and each traffic density of the scenario are 55 %, 56 %, 63 %. To increase performance the road network for scenario 1 and scenario 2 are done by developing the best scenario namely increase capacity of road for basic the road network as scenario 3 for increase performance scenario 1 and scenario 4 are done by constructions new Flyover for increase performance scenario 2. Traffic density for scenario 3 and 4 for each scenario are 52 % and 60 %. Results of congestions cost show that Cihampelas street have highly congestion cost are compared the other road especilally around the Flyover.
ANALISA PENYEBAB KEGAGALAN PIPA SUPERHEATHER BOILER -, Fahrizal
E-Journal Aptek Vol 5, No 1 (2013)
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Tube Superheater boiler yang dioperasikan PT. Rohul Sawit Indah untuk mengahasillkan steam dan Pembangkit Energi Listrik mengalami kegagalan. Ini sangat mengganggu produktivitas pengolahan pada pabrik. Untuk itu perlu dilakukan penelitian terhadap sumber kegagalan agar dapat dilakukan tindakan preventif dan perbaikan sehingga pada waktu yang akan datang kerusakan yang sama tidak terulang lagi.Dalam menganalisa kerusakan dilakukan dengan metode pengujian tidak merusak dan pengujian merusak antara lain pemeriksaan visual, pengujian komposisi kimia, pengujian kekerasan dan metalografi.Dari hasil pengujian diketahui bahwa kemungkinan timbulnya kerusakan disebabkan oleh tercemarnya kualitas air pengisi boiler dan mode gagalnya pipa Superheater tersebut adalah Creep akibat beroperasi pada temperatur dan tekanan yang tinggi dengan waktu operasi yang lama dan dikuti pelunakan (anealing) sehingga terjadi erosi oleh fluida dalam pipa yang menyebabkan penipisan pada pipa hingga pipa tidak bisa menahan beban kerja dan terjadi kegagalan(Failure).
ANALISA PENGGUNAAN BLOWER MEMINDAHKAN KERNEL DARI STASIUN OLAHAN KETANGKI PENAMPUNGAN -, Fahrizal
Jurnal APTEK Vol 5, No 2 (2013): APLIKASI TEKNOLOGI
Publisher : Universitas Pasir Pengaraian

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Processing of fresh fruit bunches (FFB) on Crude Palm Oil Mill produces Plam Oil (CPO)and the kernel.The kernel is the core of palm fruit palm oil can be used as a higher quality than the palmoil derived from palm fruit skin (CPO) itself. Due to the limitations of the kernel processing tools atthe generaly palm oil factory, this kernel be used as an export commodity. Once through severalprocesses to become the kernel, then the kernel is first stored in temporary storage tanks. To movethe kernel of processing stations to the temporary storage tank, needs blower power
ANALISIS TEORITIS THERMODINAMIKA PADA TEMPERATUR GAS BUANG MOTOR DIESEL 2500 CC DAN PENGARUHNYA TERHADAP SUDU – SUDU TURBIN TURBO CHARGER Hakim, Legisnal
E-Journal Aptek Vol 2, No 1 (2010)
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Motor diesel is growing rapidly now, and have a better performance, technology and construction machinery has undergone innovation - innovation that spectacular, fuel system, air intake systems and other systems, which can support the engine performance is also experiencing a very recent innovation. Diesel engines are usually called compression ignition engine (compression ignition engines), how ignition fuel is done by spraying fuel into the air that has been pressurized and high temperature. Currently diesel engine with a small total volume produce big power, is none other than the already wide use of the turbo charger to add the intake air pressure and increase the effective pressure, increased air temperature in the cylinder so the engine power increased by approximately 25% compared to engines without turbo chargers . Turbo Charger driven by exhaust gases from combustion, where the turbo charger has two main components of the turbine wheel, made of heat-resistant cast metal and compressor wheels, made of aluminum alloy in rollers and then done. Dominant turbine wheel gets the direct heat from the remaining combustion gases, and, temperature of exhaust gas turbo-diesel engine that uses a range between 600 - 7000C. There is also a diesel engine equipped with cooling air before the air entered keselinder with the aim of avoiding severe decline in the volume of fresh air which affects the amount of air which is input / smoked. Failure may occur in turbine wheel that may be caused by gas temperature and exhaust gas quality is not normal, with the theoretical analysis of thermodynamics can be calculated based on the assumption that pressure is not normal.
ANALISA PENGARUH VARIASI LAPISAN PLAT PADA PIPA SEJAJAR TERHADAP EFEKTIFITAS PENYERAPAN PANAS KOLEKTOR SURYA UNTUK PEMANAS AIR DENGAN SISTEM EFEK TERMOSIFON Elfiano, Eddy; Darin, M. Natsir; Nizar, M.
E-Journal Aptek Vol 5, No 2 (2013)
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The sun is a source of alternative energy that is not polluting and can be used either directly or indirectly. Based on that we can use the energy of sunlight to heat water system with thermosiphon effects, by using a means of collecting solar radiation (solar collector) which absorbs the radiation and convert into heat through the absorber plate and forwarded to a pipe containing water. Absorber plate layer affects the effectiveness of the absorption of solar heat collectors. Solar collector is analyzed in the variation of the absorber plate layer on the parallel pipe, absorber plate is positioned above and below the parallel pipeline. Experiment conducted starting at 9:00 am to 15:00 pm. Effectiveness of heat absorption is obtained by using a layer under the parallel pipe plate at 11.2%, while for the layers above and below the plate parallel pipelines reached 17.8%. Differences in the efficiency of the obtained results that the use of layers above and below the absorber plate parallel pipeline more effectively.

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