Article Per Year (5 Year)
p-Index From 2020 - 2025
2.33
P-Index
This Author published in this journals
All Journal Penelitian Pendidikan Jurnal Ilmu Dasar Jurnal Penelitian Pendidikan IPA (JPPIPA) JURNAL PENDIDIKAN TAMBUSAI Eksakta : Berkala Ilmiah Bidang MIPA Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika Phydagogic : Jurnal Fisika dan Pembelajarannya
Riri Jonuarti
Universitas Negeri Padang
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

Published : 17 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 17 Documents
Search

 1   2 
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. 
Analysis of Blood Flow in Arterial Stenosis Using Casson and Power-Law Fluid Model Riri Jonuarti
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  
ANALYSIS INDICATOR OF CRITICAL THINKING SKILLS IN PHYSICS TEXTBOOKS FOR SENIOR HIGH SCHOOL GRADE X SEMESTER 1 IN PADANG Intan Purnama Yani; Rita Iranie; - Ratnawulan; Riri Jonuarti; Fanny Rahmatina Rahim
PILLAR OF PHYSICS EDUCATION Vol 14, No 2 (2021)
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (290.102 KB) | DOI: 10.24036/11859171074

Abstract

This research aims to determine the availability of critical thinking skills indicators in physics textbooks for grade X semester one high-school physics used in Padang. This research is descriptive research with a qualitative approach. The data population in this study was all physics textbooks for Grade X semester 1 used in senior high schools in Padang. The research sample is the three physics textbooks that are most widely used in senior high schools in Padang. The data in this study were taken using critical thinking indicator analysis instruments in physics textbooks for grade X SMA with data collection techniques through documentation studies. Based on the results of the analysis of critical thinking skills indicators in the physics textbook for grade X semester 1, it was found that the physics textbook written by Marthen Kanginan published by Erlangga has the highest level of availability of critical thinking skills indicators with a percentage of 51.6% in the available category. In contrast, physics textbooks written by Aris Prasetyo Nugroho et al. and published by Mediatama have the lowest availability of critical thinking skills indicators with 29.6% with the less available category.
THE EFFECT OF VARIATIONS OF COMPOSITION OF FELSDPAR AND THE SHELL OF PENSI SHELL (Corbicula Moltkiana) FROM LAKE MANINJAU ON THE FLEXIBILITY OF DENTURE Arni Sopianti; Riri Jonuarti; - Ratnawulan; - Gusnedi
PILLAR OF PHYSICS Vol 14, No 2 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12206171074

Abstract

Utilization of waste pensi shells (Corbicula Moltkiana) in Lake Maninjau has not been fully optimal so that a more economical business is needed. One of them is the use of calcium oxide in pensi shells. Calcium oxide is one of the most commonly used calcium in the manufacture of dentures. This study aims to determine the value of the optimum flexural strength of the denture in order to obtain a higher quality denture material on the pensi shell that can be utilized and which has economic value. The method used is the experimental method. The sample used in this study with a size of 90 mm X 18 mm X 8 mm for testing flexibility / flexural strength. The total samples used in this study were 12 samples for testing the flexibility/flexural strength using a bending testing machine. For the use of pensi shell material, a calcination process was carried out at a temperature of 1000℃ on the pensi shell material and then characterized using XRF to determine the ingredients. The results of the characterization using XRF showed that pensi shells contain calcium elements of 97.121% and about 3% other elements such as Si, Al, P, Ag, Mn and Fe. Then the pensi shell material is mixed with other ingredients such as felsdpar, quartz, and kaolin. The material is mixed and then molded for flexural testing specimens. Based on the test results of this study, the highest flexibility value for denture samples was found in sample 4 with the most variations of pensi shell powder. The highest denture flexibility value is 25.778 MPa with a variation of 30 gram pensi shell powder in sample 4. The lowest denture flexibility value is 5.727 MPa with a variation of 0 gram pensi shell powder in sample 1. This is due to the addition of pensi shell powder. can increase the value of flexibility in dentures. The increase in the flexibility value was influenced by the CaO content obtained from the pensi shell powder.
ANALISIS STRUKTUR NANO DARI LAPISAN TIPIS COBALT FERRITE YANG DIPREPARASI DENGAN METODE SPUTTERING Ramli Ramli; Riri Jonuarti; Ambran Hartono
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 18 No. 01 (2017): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

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.
The Effect of Variations of Bagasse Sugarcane Fiber Composition with Plastic/Polypropylene Waste Matrix and Paper Sludge Filler on Acoustic Testing on Composite Panels Kasih Syirpia; - Hidayati; Yenni Darvina; Riri Jonuarti
PILLAR OF PHYSICS Vol 15, No 1 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12136171074

Abstract

Noise can affect a person's health and comfort. Noise can cause mood disorders, anxiety, and stress. One of the efforts to control noise is the selection of acoustic materials. The utilization of these materials can use as panels that can muffle sound, thereby reducing noise.  In this study, bagasse fiber, polypropylene plastic waste, and paper sludge were used as materials in the manufacturing of composite panels. The method used is the impedance tube method. The greaterzthe sound absorption coefficient, the betterethe material is used as a sound dampening material. In this study, the composition of polypropylene plastic and paper sludge was 40:60, and variations in fiber composition of 0%,1%,2%,3% of the total weight of the composite panel. The bagasse fiber used is a fiber that has been alkalized to a good mechanical interlocking between the fiber and the matrix.Based on the results, the highestasound absorptionrcoefficienteis 0.98 atea frequency of 8000 Hzsfor a 3% fiber composition. The lowest soundeabsorptionrcoefficient is 0.63 at arfrequency of 2000eHz, for a 0% fiber composition. The more fiber composition used in the composite panel, the higher the resulting sound absorption coefficient. More bagasse fibers can increase the pores and thickness of the composite panel so it can absorb the sound that passes through it. The greater the soundaabsorption coefficient, the better the materialeis used as sound material. All sample variations meet the standard requirements as noise materials in buildings, namely 0.15
Effect of Calcination Temperature on Microstructure, Porosity and Hardness of Cao/Sio2 Nanocomposites for Bone Implants Wardatul Ullya; Riri Jonuarti; - Ratnawulan
PILLAR OF PHYSICS Vol 15, No 2 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/13872171074

Abstract

This research is a study on the effect of calcination temperature on microstructure, porosity, and hardness of CaO/SiO2 nanocomposites for bone implants made from natural materials of pensi shells and silica sand. The purpose of this study was to determine the effect of variations in calcination temperature on the morphological analysis of structural form, porosity, and hardness of CaO/SiO2 nanocomposites in samples for biomaterials and to determine whether CaO/SiO2 nanocomposites derived from pensi shells and quartz sand are possible to be applied as biomaterials. The results showed that the effect of variations in calcination temperature on the microstructure of bone implant samples was that the higher the calcination temperature would affect the microstructure's shape on the surface of the model where the surface formed was widening, and the grain size was getting smaller. In the porosity, it can be seen that there is diffusion between one grain and another. The grains melt with each other and close the pores from the outside, resulting in compaction at a temperature of 1000°C with a porosity value of 0.005% and the best hardness value of 4.8 kg/mm2.
The Effect of Compositional Optical Analysis of ZnO/TiO2 Composites In a Sunscreen Product Maritza Syalsabilla; Fuad Sofaturahman; Mira Syuriyani; Lia Rifka Septiana; Nadia Raisa Aryani; Riri Jonuarti; - Ratnawulan; Rahmat Hidayat
PILLAR OF PHYSICS Vol 16, No 2 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/14929171074

Abstract

TiO2 and ZnO are active components in commercialized physical sunscreens that have a broad protective spectrum, which includes UVB and UVA. The combination of ZnO/TiO2 composites has more effective performance in blocking Ultra Violet rays in a wide wavelength range compared to ZnO or TiO2 alone. However, the high refractive index of TiO2 can cause a white cast. To solve the issue, a cream was created by incorporating antioxidants such as Virgin Coconut Oil (VCO). The purpose of this study is to determine the effect of the ZnO/TiO2 composite optical composition on visible and ultra violet light. Three composition comparisons were investigated in the study: ZnO/TiO2 10% added VCO, ZnO/TiO2 5% added VCO, and ZnO/TiO2 5% without VCO. UV-vis spectroscopy characterization showed that the ZnO/TiO2 composite absorbed more effectively in the ultra violet range than in visible light, and the greatest absorption and maximum reflectance are in the UVA1 range. The higher the concentration of ZnO/TiO2 in the cream composition, the higher the cream's absorption and reflection peaks. The reflectance in the visible light region is low, between 30% and 40%, implying that visible light passes through the sunscreen cream 70% to 80% of the time. As a result, the higher the ultra violet reflectance of the physical sunscreen cream, the lower the transparency. The higher the concentration of ZnO/TiO2, the greater the band gap value of the physical sunscreen, in the range of 3.1–3.5 eV
Making of Biodegradable Plastic Based on Corn Starch (Amylum Maydis) with Addition of Acid (CH3 COOh) and Gliserol Plasticizer Desti Yuspita Sari; - Ratnawulan; Riri Jonuarti; Rahmat Hidayat
PILLAR OF PHYSICS Vol 16, No 2 (2023)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/15040171074

Abstract

Almost all countries face the problem of plastic waste due to the large production of conventional plastics and the long degradation process. Therefore, to protect nature from the accumulation of plastic waste, research on biodegradable plastics needs to be done. Biodegradable plastics are made from starch, cellulose, chitosan, and proteins extracted from renewable biomass. Starch for making biodegradable plastics can be obtained from plants, one of which is corn. This study aims to determine the effect of the composition of acetic acid, glycerol and corn starch on the quality of biodegradable plastics which include tensile strength, elongation and biodegradation. The independent variables were variations of acetic acid and glycerol. Control variables are plastic mold size, corn starch mass of 5 grams, other compounds outside the independent variables. The dependent variable is tensile strength, elongation and biodegradation. To test the tensile strength and elongation of biodegradable plastic, Ultimate Testing Machine Mini was used. The results showed that the addition of acetic acid and glycerol to the corn starch and glycerol blending material had an effect on increasing the tensile strength value and reducing the elongation and biodegradation values of biodegradable plastics. The highest tensile strength value is 50.04 Mpa, obtained from the addition of 1.44% acetic acid and 35.71% glycerol from a volume of distilled water of 70 ml. The highest length gain or elongation of 90% was obtained from the addition of 0.48% acetic acid and glycerol as much as 21.43% of the 70 ml volume of distilled water. Percent weight loss of the largest plastic obtained from the addition of acetic acid as much as 0.48% and glycerol as much as 21.43% of the volume of distilled water as much as 70 ml, which amounted to 93.33%. 
Sintesis dan Karakterisasi Material Beton Hidrofobik dan Self Healing Berbasis Mikroorganisme Yulia Maulida; Ratnawulan; Riri Jonuarti; Harman Amir
Jurnal Penelitian Pendidikan IPA Vol 9 No 12 (2023): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i12.5841

Abstract

The high water absorption of concrete causes the concrete to easily experience cracking and damage. One way to increase the durability of concrete is by adding microbes which can fill the micro cavities in the concrete with the resulting Calcium Carbonate (CaCO3) deposits. However, the weakness of using microorganisms is that they are unable to withstand high hydration heat. Therefore, by varying the temperature in this research, it is possible to determine the effect of the metabolism of the bacteria produced. This research was carried out to avoid damage by creating a hydrophobic and self-healing layer which helps increase the durability and strength of the concrete. The concrete sample made resembles a cube measuring 5 cm x 5 cm x 5 cm. The manufacturing materials are Portland cement, Otawa sand, distilled water and a mixture of E. coli bacteria. Heating was carried out using an oven at temperatures of 30, 60, 90, and 120 oC. Characterization testing was carried out using a Cpmreson machine, XRD and contact angle testing.
Co-Authors AA Sudharmawan, AA Ambran Hartono Arni Sopianti Cahyaningrum, Wahyu Desti Yuspita Sari Fadhila Ulfa Jhora Fanny Rahmatina Rahim Fatni Mufit Fuad Sofaturahman Gusnedi Gusnedi Gusnedi, - Harman Amir Hidayati Hidayati Hidayati Hidayati Indri Saputri Pertama Intan Purnama Yani Kasih Syirpia Lia Rifka Septiana Maharani, M Maritza Syalsabilla Mira Syuriyani Nadia Raisa Aryani Rahmat Hidayat Rahmat Hidayat Raisa, Nadia Ramli Ramli Ratnawulan . Rifka, Lia Rita Iranie Sofaturrohman, Fuad Syalsabilla, Maritza Syuriyani, Mira Tika Rahmadani Wardatul Ullya Yenni Darvina Yulia Maulida Yuliana, Yuli Yuliani, Kurnia Dwi Yurnetti, Yurnetti