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Didit Budi Nugroho
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Journal of Science and Science Education
Published by Universitas Kristen Satya Wacana
ISSN : -     EISSN : 25983830     DOI : 10.24246
Core Subject : Science, Education,
Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Mathematics Physics
The Journal of Science & Science Education (JoSSE) publishes academic articles of conceptual, experimental, philosophical, theoretical and applied results, and reviews in the field of mathematics and natural sciences from the following subject areas: - Biology & Biology Education - Chemistry & Chemistry Education - Physics & Physics Education - Mathematics & Mathematics Education - Statistics - Computer Science.
Arjuna Subject : Umum - Umum
Articles 35 Documents
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The effect of organizational structure, personality and work motivation on teacher organization commitments on International Islamic Education Council Foundation in Jakarta and Bekasi Maruf Akbar; Zerry Novian; Mukhneri Mukhtar
Journal of Science and Science Education Vol 3 No 1 (2019): JoSSE Vol. 3 No. 1 (May 2019)
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana

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Abstract

This research aims to analyze the influence of organizational structure, personality and work motivation on teacher organizational commitment to the International Islamic Education Council Foundation in Jakarta and Bekasi. This research uses a quantitative approach with a survey method. The sample used in this study were 84 teachers who determined simple random. The research data was obtained from questionnaires and analyzed using path analysis supported by descriptive statistical analysis. The results of this study indicate organizational structure, personality and work motivation had direct effect on organizational commitment; organizational structure and personality had direct effect on work motivation; organizational structure and personality had indirect effect on organizational commitment mediating by work motivation. Therefore, improving organizational structure, personality and work motivation can improve organizational commitment.The novelty of this research is in the form of a research model of the influence of organizational structure and personality on organizational commitment with work motivation mediation developed from previous relevant studies with research locations at the International Islamic Education Council (YIIEC) Foundation in Jakarta and Bekasi, 2019.
The Effect of White Turmeric Extract (Curcuma Zedoaria) and Lactobacillus sp Herbal Mixture as Feed Additive on Animal Productivity Yayuk Astuti; Mega Bara Cahyantari
Journal of Science & Science Education Vol 4 No 1 (2020): JoSSE Vol. 4 No. 1 (May 2020)
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/josse.v4i1p1-9

Abstract

This study was conducted to determine the effect of herbal white turmeric extract (Curcuma zedoaria) with Lactobaccilus sp on the productivity of livestock. The test subjects within this study are 50 broiler chickens aged 0 days which were divided equally into two observation groups, namely the control group (A) and the treated group (B). The treatments are carried out as follows: A = no animal herbal mixture was added into the drinking water; B = drinking water was added with herbal mixture. Average body weight of the chickens were (A) 460 g and (B) 484 g, the feed conversion ratio values for chicken aged 6 and 13 days respectively are 0.696 (A); 0.644 (B) and 1.25 (A); 1.18 (B), while the performance index value (IP) of broiler chickens aged 6 and 13 days were 335 (A); 390 (B) and 272 (A); 315 (B), consecutively. In this study the addition of herb as feed additives into broiler chicken drinking water can increase the average body weight of the treatment group compared to the control group, the treatment group has a lower FCR value indicating good feed efficiency and IP values ​​above 300 implying good breeding process.
Development of Mathematical Model to Determining the Quantity of Required Alum (Al2(SO4)3.14H2O) at the Regional Water Utility Company in Pontianak (PDAM Tirta Khatulistiwa) Wahyu Febri Ramadhy
Journal of Science and Science Education Vol 4 No 1 (2020): JoSSE Vol. 4 No. 1 (May 2020)
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana

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Abstract

Water in Kapuas River is the raw material for clean water used by the regional water utility company in Pontianak or PDAM Tirta Khatulistiwa. Its quality was assessed through the main parameter called turbidity. To meet the clean water standard, the raw water must be undergoing a clean water treatment named coagulation using Aluminum Sulfate or Alum (Al2(SO4)3.14H2O) as coagulants. This alum must be determined its dosage to maintain the quality of the water itself. The company was using the jar-test method in order to determine the optimum dosage of alum due to its cheap price and ease. However, this method is inefficient in terms of time and cost for the laboratory. Therefore, we proposed the mathematical models which cheaper and efficient. This model build-up based on the data relationship between the optimum dosage of alum and turbidity in the coagulation process which obtained a mathematical equation that is . The offered mathematical model has resulted in turbidity values ​​that were following the Ministry of Health Regulation in 2010.
Extraction and characterization of algal oil from Lake Sebu, South Cotabato Alvin Q. Larida; Jaeven B. Bañaga
Journal of Science & Science Education Vol 5 No 1 (2021): JoSSE Vol. 5 No. 1 (May 2021)
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/josse.v5i1p12-25

Abstract

Algae is rich in storage lipids and fats that can be converted into biodiesel. This study determined the algal oil from Lake Sebu, South Cotabato as biodiesel source. Samples were prepared at varying treatments and ratio with n-Hexane. The algal oil was extracted and efficiency % were determined. FFA% and Acid Number of the oil extract were identified using chemical titration. FTIR was used for Chemical characterization while GC-MS identified fatty acid and other organics. With the constant volume of solvent and by changing the mass of dried algae, the percent yield of oil increases as the solvent to algae ratio increases. Therefore, biomass ratio with n-Hexane should be 1:3. The IR spectra of the oil extract indicated the presence of functional groups such as amine and carbonyl group of amides, methylene, methyl, and alkene. While, GC-MS showed that the fatty acids found can be a potential biodiesel.
A survey and study on modern OS reliability and security Muhammad Aqeel
Journal of Science & Science Education Vol 5 No 1 (2021): JoSSE Vol. 5 No. 1 (May 2021)
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/josse.v5i1p36-43

Abstract

Current studies in operating systems focuses on either security or on reliability. However, current or modern OS platforms call for answers that match both styles of requirements. If we build not only best applications but also middleware and OS in a similar way, we can construct systems that not only are inherently stable however also can resist attacks from malicious programs and face up to errors. In this paper, we conduct an exploratory study on Modern OS reliability and security. We examine many real OS failure facts collected from distinct administrative and real time environments and present the results which show a number of the primary reasons of OS failures.
Bioremediation of Pb and Cd contaminated soil using microorganism Andriyani Dea Wulandari; Vincentia Irene Meitiniarti
Journal of Science & Science Education Vol 5 No 1 (2021): JoSSE Vol. 5 No. 1 (May 2021)
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/josse.v5i1p1-11

Abstract

The increase in industrial waste, especially those containing Pb and Cd, which is discharged into the environment results in more polluted environment conditions. Polluted enviornment is very dangerous for the survival of living things. This technique use living things to reduce environmental pollution, making it safe for living things. Bioremediation can be carried out by in-situ and ex-situ methods with several bioremediation mechanisms, including biosorption, bioaccumulation, bioleaching, and bioprecipitation. The use ex-situ techniques in bioremediation is easier to do, especially if it is carried out to remediate soils under controlled conditions in the laboratory.
Identification and comparison of characteristics of inflation rate in cities in Indonesia in the period of 2009–2014 with the period of 2014–2019 Adi Setiawan; Bayu Wijayanto; Henry Junus Wattimanela
Journal of Science & Science Education Vol 5 No 1 (2021): JoSSE Vol. 5 No. 1 (May 2021)
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/josse.v5i1p26-35

Abstract

This study aims to identify the characteristics of the MoM inflation rate in cities in Indonesia. In addition, it also compares the distribution of the monthly inflation rate for the 2009–2014 period with the 2014-2019 period in cities in Indonesia. The method used to identify the characteristics of the MoM inflation rate is by using summary of statistics, while to compare the distribution of the monthly inflation rate for the 2009–2014 period and the 2014–2019 period, the two-sample Kolmogorov-Smirnov test is used. Characteristics of the month to month (MoM) inflation rate in cities in Indonesia for the period October 2009 to March 2019 was presented. Furthermore, the comparison of the characteristics of the MoM inflation rate from October 2009 to September 2014 (period 1) and the period from October 2014 to March 2019 (period 2) was also shown. The cities of Banda Aceh, Kendari, Yogyakarta, Jakarta and Sorong had an average characteristic of inflation each month which tended to be low in February, March, April and September.Six cities had significantly different characteristics during period 2 inflation rate compared to period 1.
Wireless bluetooth-based SIPESUT (Body Temperature Monitoring System) prototype Agatha Puteri Vitria Wahyuningsih; Giner Maslebu; Andreas Setiawan
Journal of Science & Science Education Vol 5 No 1 (2021): JoSSE Vol. 5 No. 1 (May 2021)
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/josse.v5i1p44-51

Abstract

Human body temperature is a very important parameter in monitoring health conditions. The differences in temperature can occur due to routine or the occurrence of health problems. Furthermore, many diseases are related to human body temperature and require monitoring. This study proposes the development of health technology for a wireless body temperature monitoring system. The results of the test show that the prototype system has succeeded in sending measurement data to the computer and Android systems. The calibration results also show conformity with standard measuring instruments.
Selected Plant Extract in Inhibiting the Growth of Bacteria Isolated from Raw Vegetables Junar Sebua Cano
Journal of Science and Science Education Vol 5 No 2 (2021): JoSSE Vol. 5 No. 2 (November 2021)
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/josse.v5i2p1-9

Abstract

In recent years, there has been a gradual revival of interest in the use of plant extract due to the wide spread belief that green plant sources are healthier and safer than the synthetic ones. Hence, the present study was carried out to evaluate the inhibitory effects of the ethanolic extract of Hibiscus rosa-sinensis (Gumamela) flower, Psidium guajava (Guava) leaf, Moringa oleifera (Malunggay) leaf, and Allium sativum (Garlic) clove on the microbial isolates from Brassica oleraceae (Cabbage), Brassica rapa (Pechay), and Cucumis sativus (Cucumber) using agar well diffusion method. Experimental research design was employed in the study. The 75%, 50%, and 25% concentrations of the extract were used as the treatments, while sodium hypochlorite and sterile distilled water were used as the positive and negative controls, respectively. Based on the results, the plant extract showed significant difference (p<0.05 and p<0.0) in inhibiting the growth of bacterial isolates. The 75% concentration of H. rosa-sinensis flower extract, and the 75%, 50%, and 25% concentrations of P. guajava leaf extract were found to inhibit the growth of bacterial isolates on raw vegetables, and their antimicrobial activities differed significantly (p< 0.05). On the other hand, M. oleifera leaf and A. sativum clove extract were found not effective in inhibiting the growth of bacteria on raw vegetables.
Development and Assessment of “Chem this Vlab” Learning Package Alvin Larida
Journal of Science and Science Education Vol 5 No 2 (2021): JoSSE Vol. 5 No. 2 (November 2021)
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/josse.v5i2p10-17

Abstract

This study determined the difficulty level of answering Chemistry problems of the STEM students of Libertad National High School. The respondents of the study were seventy-three (73) purposely selected students for the school year 2020-2021. Thereafter, the researcher developed a Learning Package in Chemistry to augment the learning in the new normal. It will be known as Chem in this VLab Learning Activities that focus on Chemical Solutions, Thermodynamics, and Chemical Kinetics. To validate the quality of the learning package, selected experts assessed the tool on three components: content, technical, and instructional qualities. The results revealed that students had poor performance in answering Chemistry problems and find Chemistry as difficult subject to learn. Therefore, learning activities are developed to aid their understanding on the selected topics. The instructional material was rated as a good instructional tool in learning Chemistry by the experts and recommended to be utilized in the online distance learning modality.

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