This study demonstrated that the constant average speed of a dynamic car could be measured and calculated using smartphone magnetometer. The apparatus setup was built car, linear track up to 1.50 m, bunch magnets, magnetometer application. application, 'Physics Toolbox Suite', free for experiment. magnet were attached on respectively. When are moving track, will measure magnetic field value versus time relation. fluctuate, increasing when close or decrease distance from increases. properties...

Evaluating Ageratum conyzoides (bandotan) weed potential, as a natural antibacterial agent that can be used in the biomedical fields, is objective of this study. Bandotan leaves extract (BLE) loaded PVP/CA nanofibers were fabricated using an electrospinning technique. The resulting PVP/CA/BLE exhibit pure fibers morphology, with average diameter range 145–346 nm. Fourier transform infrared analysis demonstrates similarities spectra and BLE, confirming effective loading BLE into nanofiber...

In this paper, we report on a homemade optical spectrometer using diffraction grating and image processing techniques. This device was designed to produce spectral images that could then be processed by measuring signal strength (pixel intensity) obtain the light source, transmittance, absorbance spectra of liquid sample. The consisted of: (i) white LED as (ii) cuvette or sample holder, (iii) slit, (iv) grating, (v) CMOS camera (webcam). study, various concentrations carbon nanoparticle...

Nanofibrous membrane has a potential to use in filtration technology with electrospinning as one of the techniques used synthesizing nanofibers. Polyacrylonitrile (PAN) nanofibrous membranes various fibers diameters were electrospun by varying its precursor solution concentration. The average PAN obtained from concentrations 6, 9, 12, and 14 wt% 341, 534, 1274, 2107 nm, respectively. Filtration media for apple juice clarification bilayer-structured made on commercial cellulose microfibrous...

This work aimed to study the natural dye extracted from Indonesian wild plants (Rivina humilis L.) using different solvents.The was maceration method.Three solvents, namely, aquades, acetone, and ethanol 96%, were used extract Rivina L fruit.The absorbance spectra of recorded Ultraviolet-Visible (UV-Vis) spectroscopy.The betalain pigment revealed extract's dependence on solvent.The functional groups analyzed Fourier transform infrared (FTIR) adherence carbonyl hydroxyl FTIR indicated that...

Abstract The utilization of natural polymers in producing electrospun nanofibers has received significant attention due to their biocompatibility, sustainability and diverse range applications. This research focuses on synthesizing derived from taro starch isolated tubers. investigation utilized SEM examine the structure size nanofibers. Formic acid dimethyl sulfoxide solvents were tested determine most efficient solvent system for results demonstrated that can be effectively synthesized...

The focus of this study was the synthesis polystyrene latex (PSL) particles and their diameter control for application aerosol filtration test. Simple emulsion polymerization used as method to produce uniformly spherical PSL particles. ranging from (160 941) nm obtained by controlling reaction parameters during process. were concentration styrene monomer, potassium persulphate initiator, solution temperature. larger initiator increased, analyzed SEM images. higher temperature, resulting...

In this research, Mn and Fe-based ceramic gas sensing were fabricated characterized. This research used natural mineral which is widely available in Indonesia intended to observe the characteristics of semiconducting material. Fabricating process thick films started by synthesizing powder Fe(OH)3 oxide material using precipitation method. The deposition from method previously was calcined at a temperature 800 °C produce nanoparticle powder. Nanoparticle that contains Fe mixed with an organic...

This report aimed to know the performance of local mineral-based composite ceramic. The materials used consist Indonesian minerals, which are jarosite and manganite minerals as sources oxide iron Mangan. were synthesized using precipitation method, whereas ceramic was fabricated a screen printing method fired at 600 oC furnace. results characterizations indicate that sample forms three phases on diffraction peaks. differences in resistance values ambient ethanol environments has very...

Preliminary studies about fabrication of Mn(x)Zn(2-x)FeO4 (x = 0 dan 0.1) had been done to identify the effect adding Mn2O3 10%mol towards gas sensor sensitivity. Gas ceramics that fabricated through local nature mineral-based is Yarosite mineral. The thick film semiconductor by using Screen Printing method and firing at temperature 800 °C for 2 hours. Through electrical properties test it known materials made faster response ethanol gases rather than without materials. Thick Mn0.1Zn1.9FeO4...

Abstract ZnO is a semiconductor that has excellent activity as photocatalyst under UV light region. precipitated by adding oxalate acid onto zinc acetate dehydrate solution with ultrasonic assisted at various times and flattened 500 °C. The structural properties of the samples are characterized X-Ray Diffraction (XRD) Brunauer-Emmett-Teller (BET). XRD result confirmed structure hexagonal phase. Rietveld refinement pattern La Beil method employed to analyze lattice parameters ZnO. It provides...

ZnAl2O4: Mn4+ particle were synthesize using co-precipitation NaOH and PVA as precipitating agent surfactants, followed by microwave-assisted thermal treatment. The morphology properties absorption spectral of particles investigate SEM UV-Vis spectrometer. results showed that the ZnAl2O4 has a spinel structure with various size. Absorption exhibits potential photo catalytic at visible light spectra, especially for pollutant degradation.

In this study, we have synthesized and applied the activated carbon fibbers from pyrolyzed cotton to adsorp fume pollutants. The were using an oven with simple heating method at low carbonization temperature. was successfully turned into within four hours temperature of 250°C. reults showed that activation process KOH NaOH significantly affected functional groups, morphology, diameter, porosity fibbers.

Edible films made of Na-alginate from brown algae have great potential to be developed as a fairly high abundance in Indonesia but not been widely used. Therefore, this study conducted by making edible modified the addition hydrocolloids carrageenan and glycerol plasticizier. The biopolymers is property produced film. use plasticizer aims improve properties elasticity films. This research method consists two stages. First, isolation characterization Na-alginate. Both preparation results...

Our objective was to evaluate the potential of Ageratum conyzoides weed or bandotan as a plant-based antibacterial agent for use in biomedical applications. Bandotan leaves extract (BLE) loaded with PVP/CA nanofibers fabricated using electrospinning techniques. The resulting PVP/CA/BLE showed pure fiber morphology, average diameters below 350nm. FTIR analysis shows successful loading BLE into nanofiber matrix. have high activity against Staphylococcus aureus and Pseudomonas aeruginosa,...

A facile synthesis of rare-earth free using boron carbon oxynitride (BCNO) phosphor material for security ink has been investigate. BCNO were synthesize by low temperature microwave heating methods, with H3BO3, citric acid and urea to be used as boron, nitrogen source, respectively. Then, the nanocrystals disperse in water-polymer based solution until they became evenly spreading turn into without rare earth metals. The photoluminescence (PL) UV-Visible spectroscopy use characterize optical...

Digitalization of telescopes used as learning media observation the object is quite effective. However, cost operating this system becomes one obstacles. The approach to overcome obstacle can be conducted by utilization present technology such smartphone. Physical experiments have been on design digitalization starter binoculars interfacing Personal Computer (PC) using a This experiment aimed more efficient telescope observations. Smartphone stative made in way that camera right position...

The research about synthesis and fabrication of thick film Fe2O3-ZnO had been done to identify the electrical properties film. material was by using precipitation method. Then, screen printing fire

This paper aims to find the best composition for adding salt manufacture of fermented mackerel (Restrelliger Branchysoma). The addition in sufficient quantities can kill microbes or pathogenic bacteria but produce a taste that is too salty. one causes lack public interest consuming salted fish. acid solution and starter an effort reduce content used, besides it grow lot microbes. In this paper, carried out. results obtained making using vinegar with fermentation time 14 days most effective...

Abstract We report this study that aims to know thick film sensitivity ethanol gas. The was fabricated from local mineral, is Jarosite as a source of iron oxide, and mixed with zinc oxide Mangan oxide. semiconductor mixture powder synthesized by the sol-gel method, whereas screen printing method. known gas sensing performance analyzer. An adsorbed well different electrical resistance values. Due difference in value, exhibited good performance. highest achieved approximately 91.7% 4...