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PENGARUH GRAVITASI DAN TEGANGAN PERMUKAAN PADA ALIRAN FLUIDA DI ATAS GUNDUKAN DALAM SALURAN TERBUKA* Widodo, Basuki
MATEMATIKA Vol 6, No 1 (2003): Jurnal Matematika
Publisher : MATEMATIKA

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Abstract

Pada makalah ini dikembangkan Teknik  Integral Batas (TIB) untuk mengetahui pengaruh gravitasi dan tegangan permukaan pada aliran fluida di atas gundukan dalam saluran yang mana aliran fluidanya dalam dua-dimensi, tak-mampu-mampat, tak-berputar dan tak-kental. Bentuk penyelesaiannya adalah sistem persamaan integral-batas yang berasal dari teknik Riemann-Hilbert untuk masalah batas campuran dari fungsi analitis.
SYARAT PERLU DAN CUKUP UNTUK KETERBATASAN POTENSIAL RIESZ DI RUANG MORREY KLASIK Utoyo, Mohammad Imam; Widodo, Basuki; Nusantara, Toto; Suhariningsih, Suhariningsih
Jurnal Natur Indonesia Vol 14, No 3 (2012)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (294.722 KB) | DOI: 10.31258/jnat.14.3.227-229

Abstract

This script was aimed to determine the necessary conditions for boundedness of Riesz potential in the classical Morrey space. If these results are combined with previous research results will be obtained the necessary and sufficient condition for boundedness of Riesz potential. This necessary condition is obtained through the use of characteristic function as one member of the classical Morrey space.
IBM KELOMPOK USAHA PENGRAJIN BATIK Widodo, Basuki; Astuti, Susi Budi; Rahayuningsih, Tri
JPM17 Vol 1, No 02 (2015)
Publisher : JPM17

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Abstract

If during the two partners just sell fabrics, it should be developed to sell in some form of hand made products. It is made from batik, all of which can be categorized as a souvenir. Batik in the form of souvenirs still has its own market share, that is the purpose of domestic tourists, foreign tourists as well as for celebrations such as weddings. The next obstacle is related to the production of a narrow space. Ideally batik production has space sized sufficiently broad and flexible to produce it. But in both partners, it is very narrow production space. Production stages are still allows for optimized drying stages using a drying design of effective and efficient, so it can be argued that the drying apparatus in accordance with the terms intensive. However, the increasing production to be followed without by having the expansion of space / area. In addition, to design those things need to be considered in making the selection of material drying apparatus. Because when using the metal material will result corrosion process. The next obstacle was until recently run marketing is conventional marketing that relied on information word of mouth is through the information passed from neighbor to relatives or friends, or just by using the card. Consumers are loyal employees, teachers and the general public who want batik for uniforms purposes. The resulting agreement between the partners and the proposer of activities in an attempt to overcome the problems that arise in the partner. The activities are doing the training and mentoring the design and manufacture of souvenirs made from batik, as well as the drying equipmemt needed to support the improvement of the production process. And also training on consolidation marketing theory and application of on-line marketing.Keywords: souvenir, online marketing, diversification and intensification
SOLUSI NUMERIK DARI PERSAMAAN NAVIER-STOKES Imron, Chairul; Suhariningsih, Suhariningsih; Widodo, Basuki; Yuwono, T
Limits: Journal of Mathematics and Its Applications Vol 8, No 2 (2011)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (282.221 KB) | DOI: 10.12962/j1829605X.v8i2.1440

Abstract

Interaksi antara aliran fluida dengan suatu benda sering ditemui di alam. Aliran laminar maupun turbulen yang melewati suatu permukaan benda, maka partikel-partikel di sekitar permukaan bergerak lambat akibat gaya viskos, sehingga kecepatan partikel tersebut relatif nol. Pada paper ini akan mengkaji solusi numerik untuk menyelesaikan persamaan Navier-Stokes yang diterapkan pada persegi sirkuler yang dialiri fluida.
Model Matematika dan Analisanya Dari Pemenuhan Kebutuhan Air Bersih di Suatu Kompleks Perumahan Widodo, Basuki
Limits: Journal of Mathematics and Its Applications Vol 1, No 1 (2004)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (223.468 KB) | DOI: 10.12962/j1829605X.v1i1.1352

Abstract

Air bersih merupakan kebutuhan manusia yang mendapatkan perhatian khusus untuk dipenuhi. Suatu kompleks perumahan tentu menginginkan tidak timbulnya masalah pada pemenuhan kebutuhan air bersihnya. Masalah yang sering dihadapi dalam pemenuhan ke- butuhan air bersih adalah waktu pemenuhan yang kurang baik atau terlalu lama. Hal ini salah satunya dapat disebabkan oleh debit yang kurang optimal dari PDAM yang menuju kompleks perumahan tersebut, dan jumlah rumah yang terlalu banyak dalam kompleks pe- rumahan tersebut. Karena itu perlu dibuatkan model matematikanya untuk menyelesaikan masalah tersebut. Didalam penelitian ini digunakan persamaan kontinuitas dan persamaan Bernoulli untuk pembuatan model matematika dari pemenuhan kebutuhan air bersih di suatu kompleks perumahan. Diperoleh hasil bahwa tekanan air berbanding terbalik dengan waktu pemenuhan.
PENGARUH PASIF KONTROL TERHADAP KOEFISIEN HAMBAT Imron, Chairul; Widodo, Basuki; Yuwono, Triyogi
Limits: Journal of Mathematics and Its Applications Vol 16, No 1 (2019)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/limits.v16i1.4329

Abstract

Salah satu cara untuk mengurangi koefisien hambat adalah dengan menambahkan obyek kecil yang dinamakan pasif kontrol. Tiga pasif kontrol, terdiri satu pasif kontrol berbentuk silinder tipe-I diletakkan di depan dan dua silinder sirkular diletakkan di belakang silinder sirkular utama. Diameter silinder sirkular utama adalah D dan tiga silinder pasif kontrol berdiameter . Rasio jarak antara pasif kontrol di depan dengan silinder sirkular utama adalah  dan dua pasif kontrol di belakang silinder sirkular yaitu  dan besar sudut ?= 15°, 30°, 45° dan 60°. Bilangan Reynolds yang digunakan adalah Re = 1000. Konfigurasi yang tepat untuk menurunkan koefisien hambat terjadi ketika rasio jarak  dan  dengan . Koefisien hambat yang diterima silinder sirkular dapat berkurang hingga 42.98%
ANALISA CHROME DEPOSIT DAN HARDNESS PADA PROSES HARD CHROME DENGAN VARIASI ARUS UNTUK RODA GIGI SEPEDA MOTOR Widodo, Basuki; Asmoro, Wahyu Panji
Jurnal Teknologi Technoscientia Vol 4 No 2 (2012): Vol 4 No 2 Februari 2012
Publisher : LPPM IST AKPRIND Yogyakarta

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Abstract

Most of common public equalizes term chrome metal bedding type cum all. When we call elektroplating which meraka intention is chrome. Chrome is metal bedding but in the application of his(its is applied in the form of solit like: mobil/motor, engine block awning, bumper and other aksesoris. Fundamental bedding applies nipple plating, that is layering metal with nipple base material this thing aim to get smooth equiamplitude surface and gleams. Just nipple doesn't make equiamplitude surface of metal arranged in layers gleams. After arranged in layers with chrome then equiamplitude surface of metal arranged in layers gleams glittering like at a mirror.  In bedding of hard chrome it is important to know how big level of hardness to be gotten better bedding result, besides need to be known thickness of deposit so that can protect substance from friction with other substance. At this research done various current when bedding process of hard chrome. Current applied is 15 Amperes, 20 Amperes, 25 Amperes at temperature 450 C. Is expected with existence of various current can yield level of varying hardness and thickness, so that knowable influence various current at process chrome at gear product. From result of research it is got that ever greater of current given increasingly downwards level of the hardness. So do with the thickness is ever greater is current which in giving, increasingly the chrome layer thick.
OPTIMALISASI TEMPERATUR PEMANASAN CETAKAN PERMANEN (300OC, 350OC, 400OC) TERHADAP SIFAT MEKANIK PADUAN ALUMINIUM-MAGNESIUM (SERI 5XXX) Widodo, Basuki
Jurnal Teknologi Technoscientia Vol 1 No 2 (2009): Vol 1 No 2 Februari 2009
Publisher : LPPM IST AKPRIND Yogyakarta

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Abstract

Aluminium is a light metal which has a very good physical and mechanical properties and it easy to be formed. Casting of aluminium posses some advantages high conductivity and low melting point, enables applied permanent mold too. Material that is used to make mold is from special steel, and when casting process, after aluminium-mag-nesium alloy melting will be poured in mold hence after the permanent mold heated in va-rious temperature which has been determined that is, 300 oC, 350 oC and 400 oC. Heat-ing of mold at this research meant to know how far the influence is happened to mechani-cal properties from Aluminium-Magnesium alloy (series 5xxx) especially tensile strength, hardness and transformation of microstructure. From result of research which to be got best tensile strength value to draw alloy Aluminium-Magnesium (Al-Mg) at 350 oC tem-perature equal to 11,11 kg/mm2 and highest hardness at 350 oC temperature equal to 101,64 HB (Hardness Brinnel) while microstructure that is very homogen also there is at temperature 350 oC.
ANALISIS PERLAKUAN PANAS NORMALISING PADA PENGELASAN ARGON TERHADAP SIFAT MEKANIK HASIL LASAN BAJA KARBON RENDAH Widodo, Basuki
Jurnal Teknologi Technoscientia Vol 2 No 1 (2009): Vol 2 No 1 Agustus 2009
Publisher : LPPM IST AKPRIND Yogyakarta

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Abstract

Welding is a fabric Welder i.e a fabrication process that applied to joint metal material by using temperature dissociation energy of diatomic. Up to this day, welding has been used widely on joining steel and engine constructions. The influence of thermal cycle on welding causes metallurgical changes i.e residual stress and changes of mechanical characteristics (hardness, strength tensile, reconnaissance of macro and micro structures) on the result of low carbon steel weldment. This research was done to obtain the proper treatment for normalizing weldment result on different current to mechanical character. The value of hardness and strength tensile is best obtained after normalizing process at temperature of 8600C is at the current of 140A with hardness mean value of 78,67 HRB ( weld), 73,89 HRB ( HAZ) and 70,11 HRB ( mains), while strength tensile is 45,835 Kgf/mm2.
ANALISA PENGARUH WAKTU PENCUCIAN 5% NAOH DAN PELAPISAN ACRYLIC TERHADAP KEKUATAN TARIK DAN IMPAK PADA KOMPOSIT SERAT KENAF MATRIK RESIN POLYESTER Widodo, Basuki; Widodo, Feri
Jurnal Teknologi Technoscientia Vol 3 No 2 (2011): Vol 3 No 2 Februari 2011
Publisher : LPPM IST AKPRIND Yogyakarta

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Abstract

Composite material especially with fiber reinforcement  starts growing rapidly with existence of requirement of light and strong material. Beside that, it is easy to be formed and resistant to corrosion. In this last decade, composite material using natural fiber has been implemented by the European automobile producers. Based on those considera-tions research about composite using kenaf fiber as reinforcement material big strength of mechanic for each varation. (1) Kenaf fiber without cleaning, (2) Kenaf fiber with soaking  in NaOH for an hour,(3) Kenaf fiber with soaking in NaOH for two hours and with material matrix polyester.Based on the calculation and experimental analysis soaking in NaOH and bedding of Acrylic increase the mechanical properties.  So composite resin polyester as matrix with treatment is much better than without treatment.