Articles

Found 8 Documents
Search

STUDI KEMAMPUAN GURU KIMIA SMA LULUSAN UNY DALAM MENGEMBANGKAN SOAL UAS BERBASIS HOTS Iskandar, Dodi; Senam, Senam
Jurnal Inovasi Pendidikan IPA Vol 1, No 1: April 2015
Publisher : Program Pascasarjana, Universitas Negeri Yogyakarta (UNY)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (202.655 KB)

Abstract

This study aimed to investigate senior high school chemistry teachers ability to develop semester examination materials based on higher-order thinking skills. This kind of research was a survey. A number of respondents were 15 chemistry teachers with 559 questions of semester final examination in year 2013. The used methods was documentation. This research used a document check list as an instrument to collect data. The analyzed data were C1 (remember), C2 (understand), C3 (apply) that included lower order thinking skills (LOTS), C4 (analyze), C5 (evaluate) and C6 (create) which classified to higher order thingking skills (HOTS). The results of the study was senior high school chemistry teachers ability to develop a semester examination material based on higher order thinking skills is 13,9%, which consists of C4 13.2%; C5 0.7% and C6 0.0%.
HUBUNGAN ANTARA BERAT BADAN DAN TINGGI BADAN DENGAN KECEPATAN RENANG GAYA BEBAS 50 METER PADA MAHASISWA PUTRA ILMU KEOLAHRAGAAN Iskandar, Dodi; Supriyadi, Supriyadi; Purnami, Sri
Jurnal Sport Science Vol 4, No 1 (2014): Volume 4, Nomor 1, Juni 2014
Publisher : Jurnal Sport Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (505.328 KB) | DOI: 10.17977/jss.v4i1.4992

Abstract

Abstract: The Relationship between Weight and Height with Speeds of 50-Metre Freestyle on A Students Science Keolahragaan, Weight and height are thought to have ties with swimming speed. This research aims to provide knowledge of weight and height had anything to do with swimming speed. Use the korelasional method with a research design of engineering tests. Analytical techniques descriptive statistics using the test of normality, its homogeneity and linearity. Then test the hypothesis is analyzed with correlation product moment correlation and double. Results of the analysis of the obtained conclusions that there is a relationship between weight and height with speeds of 50-metre freestyle.Key words: weight, height, speed, 50-metre freestyle.Abstrak: Berat badan dan tinggi badan dianggap memiliki hubungan dengan kecepatan renang. Penelitian ini bertujuan untuk memberikan pengetahuan berat badan dan tinggi badan ada hubungannya dengan kecepatan renang. Menggunakan rancangan penelitian metode korelasional dengan teknik tes. Teknik analisis menggunakan statistik deskriptif dengan uji normalitas, homogenitas, dan linearitas. Kemudian uji hipotesis dianalisis dengan korelasi product moment dan korelasi ganda. Hasil analisis diperoleh kesimpulan bahwa ada hubungan antara berat badan dan tinggi badan dengan kecepatan renang gaya bebas 50 meter.Kata kunci: berat badan, tinggi badan, kecepatan, renang gaya bebas 50 meter. 
HUBUNGAN ANTARA BERAT BADAN DAN TINGGI BADAN DENGAN KECEPATAN RENANG GAYA BEBAS 50 METER PADA MAHASISWA PUTRA ILMU KEOLAHRAGAAN Iskandar, Dodi; Supriyadi, Supriyadi; Purnami, Sri
Jurnal Sport Science Vol 4, No 1 (2014): Juni
Publisher : Jurnal Sport Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (28.177 KB)

Abstract

Abstract :The Relationship between Weight and Height with Speeds of 50-Metre Freestyle on A Students Science Keolahragaan, Weight and height are thought to have ties with swimming speed. This research aims to provide knowledge of weight and height had anything to do with swimming speed. Use the korelasional method with a researc h design of engineering tests. Analytical techniques descriptive statistics using the test of normality, its homogeneity and linearity. Then test the hypothesis is analyzed with correlation product moment correlation and double. Results of the analysis of the obtained conclusions that there is a relationship between weight and height with speeds of 50-metre freestyle.Key words :weight, height, speed, 50-metre freestyle.Abstrak :Berat badan dan tinggi badan dianggap memiliki hubungan dengan kecepatan renang. Penelitian ini bertujuan untuk memberikan pengetahuan berat badan dan tinggi badan ada hubungannya dengan kecepatan renang. Menggunakan rancangan penelitian metode korelasional dengan teknik tes. Teknik analisis menggunakan statistik deskriptif dengan uji normalitas, homogenitas, dan linearitas. Kemudian uji hipotesis dianalisis dengan korelasi product moment dan korelasi ganda. Hasil analisis diperoleh kesimpulan bahwa ada hubungan antara berat badan dan tinggi badan dengan kecepatan renang gaya bebas 50 meter.Kata kunci :berat badan, tinggi badan, kecepatan, renang gaya bebas 50 meter.
PERBANDINGAN METODE SPEKTROFOTOMETRI UV-VIS DAN IODIMETRI DALAM PENENTUAN ASAM ASKORBAT SEBAGAI BAHAN AJAR KIMIA ANALITIK MAHASISWA JURUSAN TEKNOLOGI PERTANIAN BERBASIS OPEN-ENDED EXPERIMENT DAN PROBLEM SOLVING Iskandar, Dodi
Jurnal Teknologi Technoscientia Vol 10, No 1 (2017): Vol 10 No 1 Agustus 017
Publisher : IST AKPRIND YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study aims to know the difference through statistical analysis from two methods in determining content of ascorbic acid in tablet (brand CIPI). This experiment is done in twenty repetition. Each of two methods did twelve times. The mass of tablet CIPI is 2,0 gram. Shapiro-Wilk Normality Test shows that the value of spectrophotometry uv-vis is 0.9714 and the value of eudiometry is 0.08261. Both of them is bigger than 0,05. Based on statistical analysis, the both of methods have normal distribution. Then, Paired T-Test is applied. The result shows that hypothesis (Ho) is accepted. This means that two method have no real difference.
PERBANDINGAN METODE SPEKTROFOTOMETRI UV-VIS DAN IODIMETRI DALAM PENENTUAN ASAM ASKORBAT SEBAGAI BAHAN AJAR KIMIA ANALITIK MAHASISWA JURUSAN TEKNOLOGI PERTANIAN BERBASIS OPEN-ENDED EXPERIMENT DAN PROBLEM SOLVING Iskandar, Dodi
Jurnal Teknologi Technoscientia Vol 10 No 1 (2017): Vol 10 No 1 Agustus 2017
Publisher : LPPM IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (829.325 KB)

Abstract

This study aims to know the difference through statistical analysis from two methods in determining content of ascorbic acid in tablet (brand CIPI). This experiment is done in twenty repetition. Each of two methods did twelve times. The mass of tablet CIPI is 2,0 gram. Shapiro-Wilk Normality Test shows that the value of spectrophotometry uv-vis is 0.9714 and the value of eudiometry is 0.08261. Both of them is bigger than 0,05. Based on statistical analysis, the both of methods have normal distribution. Then, Paired T-Test is applied. The result shows that hypothesis (Ho) is accepted. This means that two method have no real difference.
SINTESIS KITOSAN SUKSINAT DARI KITOSAN DAN SUKSINAT ANHIDRID SERTA KARAKTERISTIKNYA melati, Arsyi; Iskandar, Dodi
Jurnal Teknologi Technoscientia Vol 7 No 2 (2015): Vol 7 No 2 Februari 2015
Publisher : LPPM IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (244.869 KB)

Abstract

The purpose of this study was to determine the effect of molecular weight of chitosan towards the solubility of chitosan succinate in water. The chitosan succinate was synthesized by succinilation method. In the synthesis, chitosan with different molecular weight, low molecular weight (LMW), medium molecular weight (MMW), high molecular weight (HMW) were reacted with succinate anhydride (1:10) for 24 hours. The infrared spectra of chitosan succinate, showed by wavenumber shift, indicating that there has been interaction between chitosan and succinate anhydride. Based on results of analysis of the characterization of chitosan succinate (Analysis of nitrogen,analysis of degree of substitution, and solubility test in water), succinate chitosan HMW (High Molecular Weight)  has the highest level of solubility. At temperature of 800C, it dissolves until 99.34% of solubility, the succinate chitosan has 2.98% of nitrogent content,  and 0.60 of degree of substitution. From this research can be inferred that larger molecular weight of chitosan can lead into a higheer degree of substitution and solubility values in water.
KUALITAS BAKTERIOLOGI PADA DEPOT AIR MINUM ISI ULANG DI KOTA PONTIANAK TAHUN 2007 -, Suharno; Nasip, Muhammad; Iskandar, Dodi
Jurnal Teknologi Technoscientia Vol 2 No 2 (2010): Vol 2 No 2 Februari 2010
Publisher : LPPM IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (250.022 KB)

Abstract

Based on the datas of health departement of Pontianak City, the Number of the refill drink water storehouse had been achieved 57. People as consumer of it have the right to get insurance of health and safety. Therefore there was needed to study bacte-riolgical test.This study was to get datas and to learn the coliform bacteriological contents of raw water and processed water on the refill drink water storehouse in Pontianak City. Raw water resource in Pontianak was 100 % derived from mountains. It covered 77.2 % of Anjungan, 12.3 % of Paniraman, 10.0 % of Sui Purun. It had Most Probable Coliform Number and Echericia Coli Number were 71.9 % and 59.6 % in sequence. These did not fulfill the requirements of health standard yet. Like wise, processed water of storehouse in Pontianak possessed 33.3 % of Most Probable Coliform Number and 15.4 % of E.Coli Number. The quality of raw water had significant coherence with Most Probable Coliform Number and Echericia Coli Number. Other factors that related to product of processed water quality were: The protection of raw water, disinfection processing, and water re-filling processing to plastic flask. Hence, the advice for processing manager of drinking water were to more taking a care the quality by disinfection pretreatment and protection. It was suggested for the health department to monitor and to evaluate continuesly at least every six months. It was recommended to people to choose selectively became customer of refill drinking water storehousers. Choose between them that had steril and saniter processing.
SINTESIS KARBOKSIMETIL KITOSAN TERHADAP PENGARUH KONSENTRASI NATRIUM HIDROKSIA DAN RASIO KITOSAN DENGAN ASAM MONOKLORO ASETAT Rahmawati, Helda; Iskandar, Dodi
Jurnal Teknologi Technoscientia Vol 6 No 2 (2014): Vol 6 No 2 Februari 2014
Publisher : LPPM IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (629.971 KB)

Abstract

This study aims to determine the effect of NaOH concentration and the ratio of monocloro acetic acid with chitosan used in the synthesis process to the degree of substitution and solubility in water. Preparation of carboxymethyl chitosan (CMCts) was carried out by various concentration of NaOH and ratio of monochloro acetic acid with chitosan. The concentration of NaOH used in the alkalination process were 10, 20, 30, 40, and 50% (w/v). The ratio of chitosan: monochloro acetic acid used for etherification were 1:0,5; 1:1; 1:1,5; and 1:2 (w/w). Etherification was carried out at a temperature of 60°C for 2 hours. The results showed that the NaOH concentration of 10-30% (w/v) increased the substitution degree and solubility of produced CMCts. But at concentrations above 30% (w/v) the substitution degree and solubility were decreased. The ratio of chitosan : monochloro acetic acid also affect to substitution degree and the solubility of synthesized CMCts. The higher amount of monochloro acetic acid added to chitosan, the higher is substitution degree and the solubility of carboxymethyl chitosan synthesized in water. The best result was obtained when the ratio of chitosan : monochloro acetic acid were 1:2 (w/w). Within this ratio a 92.05% of yield was resulted with a solubility of 28.05 g/L and a substitution degree of 0.72.