Garuda - Garba Rujukan Digital

Article Per Year (5 Year)

All

Jurnal Sains Dasar

jsd
Website

Published by Universitas Negeri Yogyakarta

ISSN : 20859872 EISSN : 24431273 DOI : 10.21831

Core Subject : Education,

Education

Arjuna Subject : -

Articles 237 Documents

8 9 10 11 12

SYNTHESIS OF BIODIESEL FROM KAPUK SEED OIL (Ceiba Pentandra L) AT VARIATION STIRRING DURATION IN TRANSESTERIFICATION PROCESS Siswani, Endang Dwi; Kristianingrum, Susila; Tohari, Tohari
Jurnal Sains Dasar Vol 4, No 2 (2015): October 2015
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

The synthesis of biodiesel targeted as SNI 04-7182-2006 standard has been done from kapuk randu seed, following two steps i.e. sokhlet extraction process of kapuk seed oil from kapuk seed using n-heksane as a solvent, and the production of biodiesel from kapuk seed oil by transesterification process using methanol and KOH as catalyst. Transesterificatin process was performed at temperature 50 oC with the variation of stirring duration as followed 50, 75, 100 and 125 minutes. The kapuk randu extraction resulted % kapuk randu seed oil, while the transestherification process resulted around 55 - 65%. The biodiesel product characteristics provided the density value of all biodiesel at stirring durations variation are suitable with SNI standard (850 – 890 kg/m3), the viscosity value of all biodiesel are higher than the range SNI value (2,3 – 6,0 cSt). While the flash point values are lesser than SNI standard (10160 - 11000 cal/g). Keywords: kapuk randu seed, transestherification, biodiesel

EMBRYONIC DEVELOPMENTAL ANOMALY IDENTIFICATION OF GIANT MIMI-MINTUNO (Tachupleus gigas) DURING ARTIFICIAL INCUBATION PERIOD IN THE VIAL BOTTLES Ciptono Ciptono; Tri Harjana
Jurnal Sains Dasar Vol 4, No 1 (2015): April 2015
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

This study aims to reveal the phenomenon of presence / absence of anomalies in the early development of Mimi-giant mintuno (Tachypleus gigas) during artificial incubation in the vial bottles. Samples 5 eggs are fertilized incorporated into transparent 50 bottles and vials each filled with clear sea water medium. Embryonic stages (instars) hatch, bottles marked, then dumped seawater medium was replaced with 4% formalin solution and glycerin amount of 5% by volume, up to ¾ of the total volume of the vial bottles. Standard stages of giant Mimi-mintuno embryonic normal development Mimi-mintuno according to Itow (1988). The description type of anomalies contained in the post-hatching embryo development. The observations are documented in the form of stereo-microphotograph. The results showed that there are forms anomalies: (a). Delayed development, the structure of the body is not perfect; (b). In observation of the embryo hatches, open shell and egg perivitelline membrane has been opened but delayed development, the structure of the body is not perfect; (c). Embryos after hatched perfectly, abnormalities of morphologic structure such as abnormal protrusion on the dorsal carapace part found. Keywords: Tachypleus gigas, artificially, incubation

SYNTHESIS AND CHARACTERIZATION OF BIODEGRDABLE PLASTIC FROM CASAVA STARCH AND ALOE VERA EXTRACT WITH GLYCEROL PLASTICIZER Apriyani, Mery; Sedyadi, Endaruji
Jurnal Sains Dasar Vol 4, No 2 (2015): October 2015
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Synthesis and characterizations of Biodegradable Plastic made of Cassava Waste Starch, glycerol, acetic acid and Aloe vera extract has done. The aims of this research are to study the influence of addition of aloe vera extract in plastics mechanics properties, water vapor transmission rate and biodegradation. There are five main steps in this research, extraction of aloe vera, cassava starch preparation from cassava waste, preparations, characterization and biodegradability study of biodegradable plastic. The addition variations of aloe vera extract that used in this research are 0.01; 0.03; 0.05; 0.07 and 0.14 grams. Results showed that the addition of aloe Vera tends to increased biodegrable plastic thickness to 0.01 mm and elongation to 32.07%. However, biodegradable plastic tensile strength tends to decreased to 23.95 Mpa. Optimum tensile strength is 3.90 Mpa and elongation is 34.43%. Optimum water vapor transmission rate is 2.40 g/m2hours. Biodegradation study of biodegradable plastic showed that addition of aloe vera extract doesn’t significantly influence in plastic degradations.

SEED VIABILITY TEST OF COMMERSIAL DATES ON THE MARKET Ekosari Roektiningroem; Purwanti Widhy
Jurnal Sains Dasar Vol 4, No 1 (2015): April 2015
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

This research aims to to know the seed viability of the two dates on the market. It has been done from July to November 2014, in the laboratory of Mathematics and Natural Science Faculty, Yogyakarta State University. The type of Dates seeds are Sayer (oval-cilindrical, ±3cm, dark orange brown/more light than another), and Lulu (round, ±2cm, dark maroon reddish /more dark than Sayer’s). Viability test by germination testing; conducted on plastic tray with cotton sheet and fabric covered; fill with 100 grains of seeds. Repeated 4 times. Incubation at room temperature (±30oC). The parameters were seed fresh weight, seed dry weight, seed moisture, germination percentage and germination rate. The results were analyzed by compare mean - independent samples t test of SPSS 18’th. The results showed that the viability of both of Date’s seeds from local’s market (Sayer and Lulu) is high. Sayer’s have better viability than Lulu’s (due to the germination percentage and germination rate). Keywords: date seed, viability test, germination test

ANALYSIS OF PHYSICAL PROPERTIES OF OPEN CLUSTER M45 BY CCD PHOTOMETRY TECHNIQUE Chaiwarakorn, Sommkorn; Sukkaew, Adulsman; Chemasalae, Salmee; Thassana, Chewa
Jurnal Sains Dasar Vol 7, No 1 (2018): April 2018
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v7i1.22239

In this work, the open cluster M45 was observed by CCD photometry technique using a standard UBV filter via Ritchey-Chretien Telescope, which has a diameter of 0.5 meter. The author measured data have to be analyzed by using IRIS program, shows that the true apparent magnitudes of the 30 stars in the visual and blue wavelength bands range from 8.244 to 9.000, and 8.278 to 9.005, absolute magnitudes in the visual and blue wavelength bands range from 2.544 to 3.300, and 2.578 to 3.338, respectively. The color indices range from -0.773 to 0.955. And standard published color indices and magnitude diagrams for the 30 stars were used. In order to obtain a Hertzsprung - Russell diagram (H-R diagram) of certain stars, was sufficient to calculate the distance of the open cluster M45 from earth at 138.038 parsecs, and its age at 1.6 x 108 years. Keywords: cluster M45, CCD photometry, IRIS proggram

EXPOSURE RELATIONSHIP INFORMATION WITH THE LEVEL OF KNOWLEDGE AND BEHAVIOUR BSE IN WOMEN Intan Mutiara Putri; Evi Nurhidayati; Djaswadi Dasuki
Jurnal Sains Dasar Vol 7, No 1 (2018): April 2018
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v7i1.22261

The incidence of breast cancer by 40 per 100,000 women and will increase if there are one or more risk factors for breast cancer. Breast self-examination (BSE) is the early detection of breast cancer is the most widely recommended for every woman. The American Cancer Society recommends young women after the age of 20 to be screened with BSE every month. Nowadays there is a tendency of breast cancer experienced by women with age (15-20an). The purpose of this study to determine the relationship of information exposure to the level of knowledge of women about breast cancer and BSE behavior. Descriptive analytic research with cross sectional study sampled women aged 20-65 years living in the of Tegalrejo Yogyakarta total of 100 respondents. The sampling technique using a multistage random sampling. Bivariate data analysis using Chi - Square with significance level ρ 0.05 and CI 95% . The results of chi-square analysis of a significant relationship between exposure information with the level of knowledge about breast cancer and BSE with a p-value (0.021) and the OR value of 4.015. The results of chi-square analysis of a significant relationship between exposure information with BSE practice with a p-value (0.002) and the OR value of 3,3. In conclusion, hhere is a relationship between the exposure of information to the level of knowledge and breast self examanation behavior. Keywords: exposure information, knowledge, breast cancer, BSE

SINTESIS DAN KARAKTERISASI METIL ESTER MINYAK BIJI CARICA DIENG (Carica candamarcensis) SEBAGAI BAHAN BAKAR BIODIESEL Nugroho Wahyu Sumartono; Joko Wahyono; Sonia Latifah; Anisa Ratih Pratiwi; Endang Dwi Siswani
Jurnal Sains Dasar Vol 7, No 1 (2018): April 2018
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Tujuan penelitian ini adalah menyintesis metil ester minyak biji carica dieng dan mengetahui karakteristiknya sebagai bahan bakar biodiesel. Proses sintesis metil ester minyak biji carica dieng melalui tahapan ekstraksi dan penjernihan minyak biji carica dieng, penentuan kadar asam lemak bebas, esterifikasi, dan sintesis ester biodiesel dengan transesterifikasi. Rendemen minyak biji carica dieng yang diperoleh dalam penelitian ini sebesar 38,80% dan rendemen metil ester biodiesel sebesar 67,0%. Hasil analisis spektroskopi IR dan kromatogram GC-MS menunjukkan bahwa minyak biji carica dieng berhasil terkonversi menjadi ester biodiesel berdasarkan perubahan gugus fungsi serta adanya senyawa ester biodiesel yang teridentifikasi. Metil ester minyak biji carica dieng memiliki viskositas kinematik sebesar 5,132 mm2/s, titik tuang pada -6 oC dan rerata kalor pembakaran sebesar 10.176,65 kal/g. Berdasarkan hasil karakteristik tersebut, metil ester minyak biji carica dieng telah memenuhi standar dan berpotensi dijadikan bahan bakar biodiesel. Kata kunci: Biodiesel, Carica candamarcensis, Dieng, Energi, Metil Ester, Minyak SYNTHESIS AND CHARACTERIZATION OF METHYL ESTER FROM CARICA DIENG (Carica candamarcensis) SEED OIL AS BIODIESEL FUEL The purpose of this research is to synthesize methyl ester of carica dieng seed oil and to know its characteristic as biodiesel fuel. The synthesis of methyl esters from carica dieng seed oil, carried out through the stages of extraction and purification of carica dieng seed oil, determination of free fatty acid content, esterification, and synthesis of biodiesel ester with transesterification. The yield of carica seed oil obtained in this research was 38.80% and the yield of methyl ester biodiesel was 67.0%. The results of IR spectroscopic analysis and GC-MS chromatogram showed that carica seed oil was successfully converted into biodiesel ester based on functional group changes as well as the presence of identified biodiesel ester compounds. Methyl ester of carica dieng seed oil has a kinematic viscosity of 5.132 mm2/s, a pour point at -6 °C and an average gross calorific value of 10,176.65 cal / g. Based on the results of these characteristics, methyl esters of carica dieng seed oil can potentially be used as biodiesel fuel. Keywords: Biodiesel, Carica candamarcensis, Dieng, Energy, Methyl Ester, Oil

SUPPORT RELATIONSHIP HUSBAND WITH MOTHER’S CONTRACEPTION SELECTION IN SIDOREJO VILLAGE, GODEAN, SLEMAN Enny Fitriahadi; Mita Mailani
Jurnal Sains Dasar Vol 7, No 1 (2018): April 2018
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v7i1.22262

Contraception use is the most prominent birth control and is proven to bring impact on fertility rate. Higher maternal fertility rates will have an impact on maternal deaths. Higher population development and unexpected pregnancy become the risk that can happen due to inefficient contraception equipment use. Intra uteri contraception is the most effective, safe, and comfortable contraception equipment for a lot of women. The objective of the study was to investigate the correlation between husband’s support and the choice of intra uteri contraception in Sidorejo Godean II Sleman Regency. The study employed analytical survey with cross sectional approach. The dependent variable was husband’s support, and independent variable was the choice of intra uteri contraception. Sample taking used cluster sampling technique with 85 husbands as the respondents. Chi square test was used to analyze the data. The result of the study showed that analysis result with chi square test obtained significance value (p-value) 0.000 smaller than 0.05 (p0.05). Statistical result showed that there was correlation between husband’s support and the choice of intra uteri contraception. There was correlation between husband’s support and the choice of intra uteri contraception. It is expected that husband’s can give support holistically, so their wives can use contraception that is the most suitable with their condition and their comfort. Keywords: husband’s support, choice of intra uteri contraception

CAN NANPCELLULOSE-TEXT AFFECT THE FIRST-YEAR PRE-SERVICE TEACHERS’ CHEMICAL LITERACY? Hernani Hernani; Billy Oktora Abdillah Fauzi; Ahmad Mudzakir
Jurnal Sains Dasar Vol 7, No 1 (2018): April 2018
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

This research aims to identify the weaknesses of the nanocellulose context based-enrichment book against chemical literacy ability of pre-service teachers based on scientific attitudes and scientific competencies in PISA 2015 through individualized learning. This research uses descriptive method. This research involved 18 first-year students of chemical education. The Instrument that used in this research is multiple-choice questions based on scientific attitudes and scientific competencies in PISA 2015 and linked to nanocellulose and ionic liquids context. The results of this research are the percentages of the weaknesses of chemical literacy ability, the results are as follows: 1) in the attitude aspects of “interest in science and technology”, environmental awareness, and valuing scientific approaches to inquiry, the results obtained respectively for 78,0%, 5,6%, and 100,0%; 2) Apply appropriate scientifc knowledge, 11,0%; 3) Identify, use and generate explanatory models and representations, 59,3%; 4) Justify appropriate predictions, 44,4%; 5) Offer explanatory hypotheses, 83,0%; 6) Explain the potential implications of scientifc knowledge for society, 50,0%; 7) Distinguish questions that could be investigated scientifcally, 22,0%; 8) Transform data from one representation to another, 89,0%; 9) Analyse and interpret data and draw appropriate conclusions, 11,1%. Based on the results, the nanocellulose context based-enrichment book has a weakness in developing scientific attitude “environmental awareness” and has weaknesses in developing sub-scientific competencies “apply appropriate scientific knowledge”, “distinguish questions that could be investigated scientifically” and “analyse and interpret data and draw appropriate conclusion”. Keywords: nanocellulose-text, PISA 2015, descriptive method

SYNTHESIS OF ADSORBENT MAGNETITE SILICA FUNCTIONALIZED CETYLTRIMETHYLAMMONIUM BROMIDE (CTAB) FROM IRON SAND KLAYAR BEACH PACITAN Endang Sawitri; Choiril Azmiyawati; P Siahaan; Adi Darmawan
Jurnal Sains Dasar Vol 7, No 1 (2018): April 2018
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Synthesis of Magnetite Silica cetyltrimethylammonium bromide (magsil-CTAB) had been successfully performed using iron sand Klayar beach as a source of natural magnetite, sodium silicate, HCl, and cetyltrimethylammonium bromide (CTAB). Addition of CTAB on silica magnetite was expected to improve the ability of the adsorbent to adsorb polar compounds such as phenols. Synthesis began with the separation of the magnetite from iron sands by separation magnetically done using permanent magnets. Silica coating on magnetite done via sol-gel method with a ratio 1:20 of magnetite and sodium silicate followed by addition of HCl to form a gel. Gel was dried at a temperature of 80 0C and 350 °C for calcination. Results obtained soaked with CTAB solution with a concentration of 0.5 mM; 1 mM; 2 mM and stirred for 24 hours. Binding of silica and magnetite above the CTAB tested by Fourier Transform Infra Red (FTIR). The presence of silica in magnetite indicated by the appearance of spectra at wave number 900 and 3500-3200 cm-1 indicating the presence of a hydroxyl group of silanol and water molecules. Besides the presence of two strong peaks observed around 1100 and 800 cm-1, respectively show the Si-O-Si asymmetric stretching and bending. From the results of spectra could be seen further there were difference intensity of the main peaks for different samples used, especially on the area around 2300 cm-1 to be a group of nitrile (C-N) and about 3700-3500 cm-1 due to the amide (N-H) of the CTAB as expected. Keywords: magnetite, silica, sol-gel, coating, CTAB

Page 10 of 24 | Total Record : 237

8 9 10 11 12

Filter by Year

2012 2025

Filter By Issues

All Issue Vol. 14 No. 1 (2025): April 2025 Vol 13, No 2 (2024): Oktober 2024 Vol 13, No 1 (2024): April 2024 Vol 12, No 1 (2023): April 2023 Vol 11, No 2 (2022): October 2022 Vol 11, No 1 (2022): April 2022 Vol 10, No 2 (2021): October 2021 Vol 10, No 1 (2021): April 2021 Vol 9, No 2 (2020): October 2020 Vol 9, No 1 (2020): April 2020 Vol 8, No 2 (2019): October 2019 Vol 8, No 1 (2019): April 2019 Vol 7, No 2 (2018): October 2018 Vol 7, No 1 (2018): April 2018 Vol 6, No 2 (2017): October 2017 Vol 6, No 1 (2017): April 2017 Vol 5, No 2 (2016): October 2016 Vol 5, No 1 (2016): April 2016 Vol 4, No 2 (2015): October 2015 Vol 4, No 1 (2015): April 2015 Vol 4, No 2 (2015): Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014 Vol 3, No 1 (2014): April 2014 Vol 2, No 2 (2013): October 2013 Vol 2, No 1 (2013): April 2013 Vol 1, No 1 (2012): April 2012 More Issue

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kab. sleman,

Daerah istimewa yogyakarta

INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name -

Contact Email -

Phone -

Journal Mail Official -

Editorial Address -

Location Kab. sleman, Daerah istimewa yogyakarta INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kab. sleman,

Daerah istimewa yogyakarta

INDONESIA