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ANALYSIS OF BLOOD FLOW IN ARTERIAL STENOSIS USING CASSON AND POWER-LAW FLUID MODEL Jonuarti, Riri
Jurnal ILMU DASAR Vol 14 No 2 (2013)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (940.981 KB) | DOI: 10.19184/jid.v14i2.322

Abstract

Simulation of blood flow behaviour in the arteries and in arterial stenosis has been made and will be discussed in this paper. This simulation uses pulsatile flow and blood flow in artery without stenosis is considered as a dynamic fluid, compressed and condensed. Whereas, in the case of arterial stenosis has been used Casson and Power-law fluid models. In the arteries without stenosis, blood flow velocity profiles show the same pattern for each Womersley number, but with different speed value. In the case of arterial stenosis, blood flow rate decreases with increasing stenosis position away from axis of blood vessels. Resistances to flow are increases with increasing the size (height and length) of stenosis, both for the Casson and Power-law fluid models. If resistance to flow increases, it is more difficult for the blood to pass through an artery, result the flow decreases and heart has to work harder to maintain adequate circulation.Keywords : Artery, blood flow, power-law fluid, Casson fluid, stenosis  
EFEKTIVITAS PENGETAHUAN PENGELOLAAN LABORATORIUM DAN SUBSTANSI BAHAN AJAR TERHADAP PENGETAHUAN GURU MEMBUAT MODUL PRAKTIKUM IPA SMP DALAM MENYAMBUT KURIKULUM 2013 Jonuarti, Riri; Yurnetti, Yurnetti; Hidayati, Hidayati; Mufit, Fatni
Penelitian Pendidikan Vol 5, No 1 (2014)
Publisher : Penelitian Pendidikan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (402.207 KB)

Abstract

Abstrak Salah satu kompetensi dasar IPA dalam Kurikulum 2013 adalah menghargai kerja individu dan kelompok dalam aktivitas sehari-hari sebagai wujud implementasi melaksanakan percobaan dan melaporkan hasil percobaan. Dengan demikian, percobaan atau praktikum perlu diberikan dalam pembelajaran IPA, agar siswa memiliki kompetensi dasar seperti yang disarankan oleh Kurikulum 2013. Namun sangat disayangkan kebanyakan guru-guru IPA SMP belum mahir merancang modul sesuai dengan praktikum yang akan mereka berikan dalam pembelajaran IPA. Tujuan dari kegiatan yang telah dilakukan adalah:1. Memberikan pengetahuan pada guru IPA terhadap alat-alat laboratorium IPA dan cara pemakaiannya, 2. Memberikan pengetahuan dan keterampilan pada guru IPA dalam membuat modul praktikum sendiri. Metode pelaksanaan kegiatan adalah dengan pelatihan dan workshop yang dilaksanakan di SMP N 25 Padang, dengan respondennya adalah guru-guru IPA SMP yang tergabung dalam base camp 2 Kota Padang. Data diperoleh dari angket yang disebar pada saat kegiatan dan dianalisis secara statistik. Diperoleh bahwa kegiatan yang dilakukan dapat menambah pengetahuan dan wawasan (92,9%) dan menambah motivasi (64,3%) guru IPA SMP terhadap alat laboratorium IPA dan cara merancang serta membuat modul praktikum IPA sendiri. Katakunci:inkuiri, kurikulum 2013, metode ilmiah, modul praktikum, pem- belajaran IPA. Abstract One of the basic competencies in the science Curriculum 2013 is to appreciate the work of individuals and groups in their daily activities as a form of implementation carrying out experiments and reported experimental results. Thereby, experiments or practicum needs to be given in science teaching, so that students have the basic competencies as suggested by the Curriculum 2013. Unfortunately, most junior high science teachers are not adept at designing the modules according to their practicum that will provide in science teaching. The purpose of these activities that have been done are: 1. Giving a knowledge of the science teachers about science laboratory tools and how to use it, 2. Giving the knowledge and skills making his own lab module. Methods of implementation of these activities are training and workshops are held in SMP N 25 Padang, with respondents were junior high science teachers who are members of the base camp 2 Padang. Data obtained from the questionnaire that has been distributed at the time of activity and statistically analyzed.Obtained that the activities carried out has increased the knowledge (92.9%) and increase motivation (64.3%) of the junior high school science teachers to design and create their own lab module. Keyword: curriculum 2013, inquiry, practicum module, scientific method, science teaching. 
ANALISIS STRUKTUR NANO DARI LAPISAN TIPIS COBALT FERRITE YANG DIPREPARASI DENGAN METODE SPUTTERING Ramli, Ramli; Jonuarti, Riri; Hartono, Ambran
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol 18 No 01 (2017): EKSAKTA Berkala Ilmiah Bidang MIPA
Publisher : Pusat Kajian Matematika dan Ilmu Pengetahuan Alam, Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (398.908 KB) | DOI: 10.24036/eksakta/vol18-iss01/16

Abstract

In this paper we report the results of studies relating to the synthesis of Cobalt Ferrite (CoFe2O4) thin films by a sputtering method. The CoFe2O4 thin film has been prepared onto silicon substrate from the sputtering targets, CoFe. Structural propertiesofthinfilms were characterized byx-ray diffraction and the morphology was characterized by scanning electron microscopy. The growth parameter are: base pressure 2,8 x 10-2 Torr, ratio of Argon:Oxygen flow rate are 100:50 sccm, deposition pressure 5.4 x10-1 Torr, growth temperature 100oC.Nanostructures of the thin film that have been analyzed are crystallite size and micro strain.We obtained the crystallite size of CoFe2O4 thin films for layer thickness of 40 and 48 nm, respectively are: 32 nm and 66 nm, while the micro strain is 8.0 x 10-4 and 10.2 x 10-4.