Variation Of Media Research Articles

Engaging electrical lighting installation classes: Android interactive learning media development with Adobe Animate CC

This study aims to develop android-based interactive learning media for Electrical Lighting Installation subjects by using Adobe Animate CC. The research was conducted in response to the limited variation of learning media, which has affected student engagement and motivation in technical subjects. The Research and Development (R&D) model, adapting a 3D out of 4D model (Define, Design, Develop) was referred to develop interactive media designed for vocational students. The media integrates audiovisual elements to enhance students' learning experiences and promote independent learning outside the classroom. The validation process utilized questionnaires, interviews, and observations from content experts, media experts, and students. The media was validated by experts in two stages. In the first stage, the media achieved a feasibility score of 68%, categorized as "fairly good." After revisions, the second validation showed an improvement with a feasibility score of 85.33%, categorized as "very good". The results indicate that the Android-based learning media potentially enhance the learning process of Electrical Lighting Installation subjects effectively, providing a more engaging and flexible tool for students. This innovation significantly contributes to improving the quality of technical education by offering an accessible and interactive learning resource. It also addresses the challenges of limited learning media variation and encourages independent learning, possibly serving as a model for the development of similar media in other technical subjects.

Elucidation of the life cycle of a saprotrophic inoperculate discomycete that is associated with pinesap using a polyphasic taxonomic approach

This study deals with the elucidation of the life cycle of an inoperculate discomycete that was eventually collected from conifer wood in South Germany and has become famous for the extraordinary diversity of its secondary metabolites when it was studied extensively during the 1990s. It had then been identified as Lachnum papyraceum (Lachnaceae, Helotiales) based on morphological traits, and extracts from its mycelial cultures were found to possess extraordinary nematicidal and antibiotic activities. Over 60 different secondary metabolites were finally identified from this fungus after extensive variation of culture media and scale-up of production up to 100-L scale. Among the main active principles were mycorrhizin A and chloromycorrhizin A, which had first been reported in 1977 from an unnamed “mycorrhizal” fungus of the hemiparasitic plant, Monotropa hypopitys (pinesap), that was isolated in Sweden. We noted that both the Lachnum strain and the original mycorrhizin producer were still available in the public domain and decided to study them for comparison using a multilocus phylogeny and also generated secondary metabolite profiles of both strains using analytical high performance liquid chromatography coupled to diode array and mass spectrometric detection (HPLC–DAD/MS). Surprisingly, the sequence data as well as the secondary metabolite profiles of both strains were highly similar, and it was also confirmed by phylogenetic methods that the strains are indeed nested within the genus Lachnum by comparison of their ITS, LSU, and RPB2 sequences. The specimen called L. papyraceum in the old publications was tentatively re-identified by Hans-Otto Baral as L. cf. subvirgineum, but substantial further work on the taxonomy of the genus remains to be done, anyway. We conclude that some Lachnum species have a highly complex but all the more interesting life cycle, and the mycorrhizal symbiont partner may invade the host plant, where it may persist as an endophyte and finally turn saprotrophic on the wood of the senescent pine tree. The taxonomy of these fungi should also be further resolved in the future, using a polythetic concept that includes chemotaxonomic data and a multi-locus genealogy.

Dimerization and Dissociation: The Rate-Controlling steps of molecular Self-Assembly during solution nucleation determined by variation of gas media

To further probe into the link between solution chemistry and nucleation processes experimental and computational data are presented on unsaturated, saturated, and supersaturated solutions and in situ monitoring of nucleation chemistry of p-chlorobenzoic acid (PCBA), p-methoxybenzoic acid (PMBA) and p-nitrobenzoic acid (PNBA), three benzoic acid derivatives with different properties of para-substituents. By variation of the gas media, we were able to establish that hydrogen-bonded dimers (HD) are the basic building unite in solution for clusters and nucleuses despite of the gases and solvents, and there is a strong link between the supersaturated solution chemistry and the intrinsic supersaturation ratio, and the nucleation kinetics. Two different molecular self-assembly pathways and the rate-controlling steps were discussed, which paves new aspects for understanding the role of solution chemistry in directing nucleation processes.

Effect of ether medium in LiTFSI and LiFSI‐based liquid electrolytes for lithium–sulfur batteries

AbstractLiquid battery electrolytes are utilized in most battery systems to date as they provide improved electrode contact and ionic conductivity compared to solid electrolytes; however, they pose major challenges regarding safety. Being highly flammable, toxic, and volatile, leakage of such a liquid electrolyte is always considered a major safety risk. Hence, the improvement of liquid electrolytes remains an important goal, especially for high gravimetric energy battery systems like the lithium–sulfur battery (LSB), which is considered a suitable battery type to enable fully electric‐powered aviation. Here, a study on the effects of a variation of the electrolyte media and salt was conducted to establish an inexpensive alternative liquid electrolyte system to the state‐of‐the‐art DOL/DME electrolyte of LSB. The combination of DEGMEE and LiFSI led to the best cycling performance showing an increase in cycling stability (110 cycles at 97% Coulombic efficiency) and specific capacity (~500 mAh g−1 in the 110th cycle) at a moderately high C‐rate of 0.25 C, which for our coin cell system translates to a moderate current of ~1.8 mA (~1.2 mA cm−2).

Seismic Velocity Response to the Ocean Waves Based on Borehole Array

The ambient noise correlation in recent years has been widely used to study the seismic velocity temporal variation related to volcanoes, geothermal fields, earthquake source regions. However, in some regions and times, seasonal seismic velocity changes which could be attributed to environmental factors, including temperature, atmospheric pressure and groundwater, can also be observed. Eliminating the influence of these environmental factors in the temporal variation monitoring results of subsurface media will be helpful to obtain the clear changes of shallow media due to tectonic activities. We used the ambient noise correlation technique of multi-component and multi-frequent-band to obtain the seismic velocity variation of crustal media in Hailing Island, Guangdong Province, China. The results show that the seismic velocity variation of crustal medium in the study area has a strong correlation with the ocean wave height

Pisang Nangka (Musa paradisiaca) As An Alternative Media For Aspergillus niger Growth

Nangka banana (Musa paradisiaca) is one of the most popular bananas in Indonesia. Therefore, the production of waste will increase along with the use of bananas. Nangka banana peel and flesh can be used as an alternative media for mushroom growth because of its high carbohydrate content. The purpose of this study was to observe the growth of Aspergillus niger on alternative media made from nangka banana with concentrations of 8%, 9%, 10%, 11% and 12% and to determine the optimum variation and concentration of alernative media. Aspergillus niger was grown on nangka banana flesh media, nangka banana peel media and mix of nangka banana peel and flesh as well as PDA (Potato Dextrose Agar) media as a positive control using the single dot method. Colony diameter and pigmentation were observed for five days. The variation of nangka banana mix media with a concentration of 12% is the optimum variation and concentration to grow Aspergillus niger. Keywords: Alternative media, Aspergillus niger, nangka banana

The Use of Fly Ash and Bottom Ash to Reduce COD, TSS, and Color in Textile Industry Wastewater Effluent

The textile industry wastewater effluent contains some levels of COD, TSS, and color, it must be reprocessed as a tertiary treatment using the filtration method. The goal of this research was to examine the ability of fly ash and bottom ash as filtration media to reduce the pollutant / organic load of COD, TSS, and color in textile industry wastewater effluent. The slow sand filter method was used in this study, and the filter media was derived from coal combustion waste. The variation used in this study is a variation of filter media (fly ash and bottom ash), with fly ash diameters of 0.11 and 0.35 mm, bottom ash diameters of 0.85 - 1.50 mm, and media thickness of 1.50 - 2.00 mm (10 cm and 20 cm). The study’s findings demonstrated that using bottom ash and fly ash media in the filtration process with a slow sand filter system could maximize the efficiency of reducing COD, TSS, and color levels in textile industry wastewater effluent. In fly ash media, it can reduce COD, TSS, and Color by 90.58%, 81.87%, and 100%. Meanwhile, Bottom Ash filter media has an average COD, TSS, and Color reduction of 87.80%, 81.87%, and of 100%.

Performance analysis of an isothermal piston in the case of air compression

A critical aspect for isothermal compression is the rapid transfer of heat, which also represents a key challenge. The heat transfer and resistance characteristics of an isothermal piston were examined through a dimensionless analysis, and the findings were compared with the experimental results. Two parameters, Ka and Xu, were established in the dimensionless model. Ka is an index reflecting the heat transfer performance, and Xu describes the temperature variation of porous media. As the heat transfer increases, the fluid resistance increases irreversibly. The parameter Xpor is proposed to indicate the effect of resistance; specifically, this parameter depends on the properties of the porous media and influences the theoretical minimum total work. The relation between the theoretical minimum total work and Xpor is presented, which can provide guidance for the optimal design of isothermal pistons.

Storytelling Podcast as an Alternative Learning Tool for Early Childhood Education: A TPACK-Based Reflection

Purpose – This article reports on a project to facilitate teachers’ digital skill improvement. The context of the project itself was the past COVID-19 pandemic, which paralized the education sector, including the closure of early childhood education (ECE) centers. While remote, online learning was highly recommended to face disastrous situation such as pandemic, in practice, especially at the ECE level, online learning faces complex challenges. On the other hand, teachers were not adequately prepared for online and digital learning. Design/methods/approach – This study combined developmental and conventional descriptive methods. The participants (15 people) were teachers, with various backgrounds of work experience (2 to over 7 years), with good internet access skills. Data and information were collected through observation, interviews, and documentation; followed by descriptive analysis. Findings – These teachers found that Podcasts could be an alternative and a variation of digital learning media. Making and using podcasts can also be an entry point in strengthening the integration of Technological and Pedagogical Content Knowledge (TPACK) in the ECE context. Research implications/limitations – While storytelling Podcast as ECE learning tool was used limitedly during the COVID-19 period, its uses may last beyond the pandemic time provided systematic integration of digital technology and skills associated with it into ECE sector is met. Practical implications – This study implies that storytelling podcasts can be an alternative learning tool in the situation where teacher-student face-to-face interaction is less possible. Originality/value – The emergency period prevented teacher-student direct contacts. This study contributes to providing an alternative to learning in an emergency situation. Paper type Research paper

Pengembangan e-LKPD Terintegrasi STEM-PjBL pada Materi Asam Basa Kelas XI SMA Menggunakan Flip PDF Proffesional Software

Variation of learning media is e-LKPD (electronic Student Worksheet) with Flip PDF Professional. Making e-LKPD is an effort to improve critical thinking skills, understanding concepts and linking the acquired knowledge to real life through integrated learning. The approach that can be used is STEM (Science, Technology, Engineering and Mathematics) which is usually followed by several learning models, one of which is PjBL (Project Based Learning). The purpose of this study was to develop an integrated STEM-PjBL e-LKPD on acid-base material for class XI SMA. This type of research is Research and Development which uses a 4-D development model, define, design, develop, and disseminate. The data analysis used is validity and practicality. The data analysis technique uses Aiken'sV to analyze the validity of the data and Kappa Aiken'sV Cohen to analyze the practicality of the data. The average Aikken'sV validity test scale is 0.85 with a very high validity category. Aikken'sV scale. The practical kappa moment of the teacher's practicality sheet is 0.90 in the very high category and from the student's practicality sheet, 0.82 is in the high category. This shows that the integrated STEM PjBL e-LKPD on acid-base material for class XI SMA which was developed is valid and practical as a learning media.

IMPLEMENTATION OF STEGANOGRAPHY ON DIGITAL IMAGE WITH MODIFIED VIGENERE CIPHER ALGORITHM AND LEAST SIGNIFICANT BIT (LSB) METHOD

Digital image can be utilized as a media to hide messages. There should be a special treatment in securing the messages so that the information accessibility can be controlled. Hiding messages to an image can be conducted using steganography. It can be combined with cryptography algorithms in order to make it harder to be accessed by unauthorized parties. The modification of cryptography algorithms can improve the confidentiality of the message content. This research is aimed to know the implementation of steganography in desktop applications using Least Significant Bit (LSB) that is combined with the modification of Vigenere Cipher algorithms. The developed software namely waterfall supports the creation of applications. The result of the research shows that the encrypted picture will change into gray or display in grayscale so that the hidden message will be more difficult to be accessed by the attacker. The encrypted picture will also have a bigger size file than the original version and the extended file. The LSB method will work precisely according to the formula of the modified cryptography algorithm. The further research is suggested to focus on the variation of media for content message and the picture format in their encryption.

Effect of Silica Sand Filter Media Size Variation Towards Turbiding Reduction of Clean Water in PT. XYZ

Turbidity is a condition in which the water contains many suspended particles of material that can cause health problems such as itchy skin, red and itchy eyes, and digestive disorders. Based on the initial inspection results, the turbidity value exceeds quality standard Permenkes No. 32/2017, which is 45.2 NTU. The high turbidity value causes the turbid water to need special treatment, one of which is by filtration with silica sand slices as filter media. This study is experimental research using a pre-posttest without a control design. This research aims to determine the effect of turbidity reduction on the variation of silica sand filter media (5–6 mesh), 7–10 mesh, and 11–18 mesh with a height of 60 cm. The population of this research is clean water at PT. XYZ, with as many as 36 samples used in this research. The results of effective and efficient turbidity reduction are on silica sand media measuring 5–6 mesh, with an average percentage of turbidity reduction of 80.49%. The conclusion of this study is the effect of silica sand filter media size variation on turbidity drop of clean water in PT. XYZ. It is recommended for the industry to apply clean water treatment with the filtration method using 5–6 mesh silica sand media, and further researchers are expected to conduct a test regarding the lifetime of the silica sand media that will be used.

Pengaruh Variasi Media Pertumbuhan terhadap Aktivitas Peredaman Radikal Bebas DPPH Ekstrak Kapang Endofit Isolat Cb.D1

Endophytic fungi are a source of antioxidant compounds in nature. The low yield of extracts and active compounds produced is one of the limiting factors for using endophytic fungi as a source of natural antioxidant compounds. Modification of growth media is an alternative solution to overcome this problem. This study aimed to determine the effect of media conditions, belonging to carbon and nitrogen sources and different initial pH of fermentation, on the antioxidant through DPPH radical scavenging activity of extract of endophytic fungi Cb.D1 isolated from cinnamon plant leaves. The culture was propagated using Czapek Dox Broth basal liquid medium with agitation speed 120 rpm at room temperature for 14 days. The carbon sources used were glucose, sucrose, and soluble starch. The nitrogen sources were natrium nitrate, ammonium nitrate, and yeast extract. The initial pH conditions used were 5, 7, and 9, and ethyl acetate as the extraction solvent. The results obtained that the variation of nitrogen and carbon sources and also initial pH conditions can increase the yield of extract of endophytic fungi Cb.D1. Glucose, yeast extract, and initial pH at 9 were the best growth media to gain it. The substitution of nitrogen sources and initial pH can increase the DPPH free radical scavenging activity of endophytic fungal extract compared to substitution for carbon sources. The highest activity from the Cb.D1 endophytic fungal extract was obtained from media that contain sucrose and natrium nitrate as a carbon and nitrogen sources and an initial pH of 5. The Variation of growth media of endophytic fungi Cb.D1 affected their extract in DPPH free radical scavenging activity.

Pengembangan Media Variasi Vising (Video Passing) Sepak Bola untuk Pembelajaran Kelas VIII Sekolah Menengah Pertama

The development of communication and information technology has a great influence on the application of media as a means of learning activities, but these advances have not been used ideally in instructional learning in schools. This study aims to produce a variety of football visioning media products for class VIII Junior High School learning. This research is a Research and Development using the ADDIE (Analyze-Design-Development-Implement-Evaluate) learning design model. As subjects in this study, namely Physical Education Teachers and Students. The object of this research is the variation of soccer vision media for junior high school students. Data collection techniques using a questionnaire. The results of the research data in the form of quantitative data were analyzed descriptively quantitatively. The feasibility of video media was obtained through four stages with an average percentage: 1) material expert validation obtained 67.91%, 2) media expert validation obtained 94.37%, 3) corner teacher response obtained 88.15%, 4) student responses obtained 82.9%. The average total assessment of video media is 83.33% with a classification of "very good", so it can be concluded that the basic soccer technique video media for junior high school students is declared suitable for use by teachers in the process of delivering material.

Enhancing the Discovery of Bioactive Secondary Metabolites From Fungal Endophytes Using Chemical Elicitation and Variation of Fermentation Media.

Endophytic microorganisms are an important source of bioactive secondary metabolites. In this study, fungal endophytes obtained from A*STAR’s Natural Product Library (NPL) and previously isolated from different habitats of Singapore were investigated for their diversity, antimicrobial, and cytotoxic activities. A total of 222 fungal strains were identified on the basis of sequence analysis of ITS region of the rDNA gene. The identified fungal strains belong to 59 genera distributed in 20 orders. Majority of the identified strains (99%; 219 strains) belong to the phylum Ascomycota, while two strains belonged to the phylum Basidiomycota, and only one strain was from Mucoromycota phylum. The most dominant genus was Colletotrichum accounting for 27% of all the identified strains. Chemical elicitation using 5-azacytidine and suberoylanilide hydroxamic acid (SAHA) and variation of fermentation media resulted in the discovery of more bioactive strains. Bioassay-guided isolation and structure elucidation of active constituents from three prioritized fungal strains: Lophiotrema sp. F6932, Muyocopron laterale F5912, and Colletotrichum tropicicola F10154, led to the isolation of a known compound; palmarumycin C8 and five novel compounds; palmarumycin CP30, muyocopronol A-C and tropicicolide. Tropicicolide displayed the strongest antifungal activity against Aspergillus fumigatus with an IC50 value of 1.8 μg/ml but with a weaker activity against the Candida albicans presenting an IC50 of 7.1 μg/ml. Palmarumycin C8 revealed the best antiproliferative activity with IC50 values of 1.1 and 2.1 μg/ml against MIA PaCa-2 and PANC-1 cells, respectively.

Needs Analysis E-Module Based Hypercontent to Improve Collage Students’ Critical Thinking Skills

This article aims to analyze the needs of teaching materials using e-module based Hypercontent and learning media can improve collage students’ critical thinking. The research method used is descriptive-qualitative, that is by doing observation, interview and document study. The problem found in teaching and learning process is that the tendency to use conventional teaching materials rather than varied modes of teaching materials so can affect their critical thinking skills. The implementation of teaching and learning process using e-module is one of the ways to facilitate students’ active learning to easily understand the materials. One of the variation of teaching and learning media that can be used is e-module based Hypercontent. Teaching and learning process using e-module is an implementation of electronic learning. Students, therefore, are able to learn independently which can be done either inside or outside the classroom.

Effect of heat-treatment processes and high temperature variation of acid-chloride media on the corrosion resistance of B265 (Ti–6Al–4V) titanium alloy in acid-chloride solution

AbstractCorrosion resistance of untreated (B265TiN), quenched (B265TiQ), and annealed (B265TiA) B265 titanium alloy was studied in 2–10 M H2SO4+ 10% NaCl solution at 30, 70, and 95°C by potentiodynamic polarization, potentiostatic measurement, open circuit potential measurement, and optical microscopy. B265TiN was the most resistant of the alloys to general corrosion at 30°C with values between 0.094 and 3.782 mm/year. B265TiQ exhibited the highest corrosion rate values (0.210–23.399 mm/year). Its plots show significant increase in cathodic slope. At 70 and 95°C, B265TiN exhibited the lowest corrosion rate in 2 and 6 M H2SO4+ 10% NaCl solution, while B265TiQ exhibited the corresponding highest values. Optical characterization shows B265TiN, B265TiQ, and B265TiA alloys are highly resistant to corrosion in 2 M H2SO4+ 10% NaCl at 30°C compared to 10 M H2SO4+ 10% NaCl, where marginal deterioration occurred on B265TiN, significant degradation on B265TiQ, and localized degradation on B265TiA. The extent of degradation increased at 70 and 95°C. B265TiN exhibited the highest resistance to metastable pits formation compared to B265TiQ and B265TiA. Potentiostatic values at 70°C shows high temperature exposure of Ti alloy to accelerated corrosion. Metastable pit initiation values at 70°C are significantly greater. Open circuit potential measurement at 30°C shows B265TiN demonstrated least vulnerability to corrosion with stable oxide formation at 2 M and 6 M H2SO4+ 10% NaCl, and B265TiQ was least vulnerable at 10 M H2SO4+ 10% NaCl. At 70°C, B265TiQ was least vulnerable to corrosion with unstable oxide formation at 2 M and 6 M H2SO4+ 10% NaCl compared to B265TiN at 10 M H2SO4+ 10% NaCl.

Al2O3 anchored silver and gold nanoparticles as accessible, stable, and re-usable catalysts

Nanoparticles of silver and gold have become widely researched as homogeneous catalysts for organic transformations. Silver systems have shown promising activity but are often hindered by their instability and difficulty in recycling. In this work we present nanoparticles of silver and gold, colloidally stabilized on aluminum oxide, and their performance as re-useable catalysts for the reduction of 4-nitrophenol. Compared with more standard citrate stabilized catalyst nanoparticles (k = 0.71 and 0.17 min−1 for Ag and Au respectively), the aluminum oxide stabilized systems are significantly more active (k = 1.82 and 0.63 min−1 for Ag and Au respectively) due to increased surface site availability. Importantly, Al2O3 supported silver nanoparticles exhibit excellent activity/re-usability as redox catalysts that are stable across a surprising variation of reaction media, including halide salts.

Lignin decomposition of Oil Palm Frond by Pleurotus ostreatus with a variation of corn and rice-husk media

This study aimed to decompose lignin from oil palm midrib (OPF) bonds using the fungus Pleurotus ostreatus with various substrates (corn and rice husk). Lignin and cellulose levels before and after mushroom culture were tested by the Chesson-Datta method. Substrate variation with corn and husk rice showed that the addition of corn did not play a role in lignin decomposition. After being given treatment, the best degradation was using 0.6 grams of rice bran and 0.4 grams of CaCO3, 22.01% for lignin and 32.74% for cellulose.

Pengenalan Media Pembelajaran Quizizz Bagi Guru SDN 1 Sentul Jombang

The online learning system in the COVID-19 pandemic has the weakness of limited ability to realize equitable distribution of learning facilities in Indonesia. Therefore, community service activities in the form of introducing the Quizizz learning media were carried out with SDN 1 Sentul teachers and local religious content teachers in Tembelang District. This community service activity is carried out from October to November 2021 which is located at SDN 1 Sentul, Sentul Village, Tembelang District, Jombang Regency. The stages in this activity are observation; material design; and the introduction of Quizizz learning media. The results of the activities showed that (1) Quizizz learning media attracted students' interest in learning; (2) Quizizz learning media is a variation of learning media; (3) Quiziz learning media can make it easier for teachers to convey material and input values. The obstacle in this activity is the internet network which is less stable.