Bending of sparklers

Abdullah, Mikrajuddin; Khairunnisa, Shafira; Akbar, Fiki T.

doi:10.1088/0143-0807/35/3/035019

Cited by 9 publications

(10 citation statements)

References 4 publications

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“…In recent years, it has been established that the absorption edge can be determined by the relationship between dielectric loss and photon energy, which results in comparable or almost identical outcomes to those obtained from Tauc's relationship. [40][41][42] The experimental results suggest that it is highly feasible to directly calculate the dielectric function using optical spectroscopy. Optical spectroscopy provides access to key parameters such as absorbance, reflectance, extinction coefficient, and refractive index (n).…”

Section: Dielectric Function Studymentioning

confidence: 99%

Studying the optoelectronic properties and emission quenching dynamics of poly‐TPD by incorporating ZnO nanoparticles and multiwalled carbon nanotubes

Al‐Asbahi

2023

J of Applied Polymer Sci

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In this study, the optoelectronic properties and emission dynamic quenching of poly‐TPD were investigated upon incorporating ZnO nanoparticles and multiwalled carbon nanotubes (MWCNTs). A solution blending method was utilized to successfully prepare poly‐TPD incorporated with various contents of ZnO/MWCNT nanocomposites. The optoelectronic properties of the nanocomposites were analyzed using UV–Vis and photoluminescence spectrophotometry. The incorporation of the nanocomposites resulted in a decrease in transmittance, reflectance, and absorption edge, indicating a reduction in the poly‐TPD's bandgap. Parameters such as extinction coefficient, Urbach energy, and charge carrier density also decreased with addition of the nanocomposites, suggesting increased scattering, disorder, and the presence of defect states. The decrease in bandgap from 2.970 to 2.852 eV with increasing the nanocomposite content confirmed the emergence of new electronic states. Furthermore, the nature of the transitions changed from direct allowed for pure poly‐TPD to direct forbidden upon incorporation of the nanocomposites. The inclusion of the nanocomposites also led to a decrease in refractive index and fluorescence intensity. The observed fluorescence quenching primarily exhibited dynamic characteristics, with a Stern–Volmer constant of 5.14 L/g and quenching rate constants surpassing the minimum threshold for efficient quenching. The increase in charge transfer rate constants with the nanocomposite content indicated enhanced quenching efficiency and charge transfer, likely due to the increased surface area and presence of defects. These findings suggest that poly‐TPD incorporated with ZnO/MWCNT nanocomposites displays promising properties for applications in optoelectronic devices.

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Section: Dielectric Function Studymentioning

confidence: 99%

Studying the optoelectronic properties and emission quenching dynamics of poly‐TPD by incorporating ZnO nanoparticles and multiwalled carbon nanotubes

Al‐Asbahi

2023

J of Applied Polymer Sci

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“…Goldberg and O'Reilly described the geometry evolution of cooking spaghetti [13]. The present author has also investigated simple common phenomena such as bending of fireworks [14], wringing of wet cloth [15], rolling of a cylinder containing granules [16,17], sand tunnel collapse [18], rice winnowing [19], measuring the atmospheric temperature in an aircraft cabin [20], and bending of vertical sheets that lead to a phase transition [21].…”

Section: Introductionmentioning

confidence: 99%

A Sarong rolled around a body demonstrates that the force for separating two sheets joined by folding and rolling is very large

Akbar

Abdullah

2020

Phys. Educ.

Self Cite

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A lot of new science has been inspired by common phenomena and even by old traditions practiced in our daily lives. Eventually, after deep exploration, this may engender unexpected new technologies. In this paper, inspired by the wearing of a traditional cloth called a sarong, by the community in South East Asian countries and others, we investigate the behavior of sheets folded in the same way as the rolling of the sarong around the stomach. Simple equipment was designed to qualitatively collect the data which was combined with simple modeling. The rolling of the sarong around the stomach generates a joining force between two sheets, increasing proportionally to the square of the number of rolls. This finding can potentially be applied for developing a method for strongly joining sheets by simply rolling them and releasing the join by unrolling. This work can also be simply duplicated elsewhere, so it is worthy of teaching materials at undergraduate level. Both the scientific and the teaching contents can be extracted simultaneously.

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“…Many activities or occurrences around us can be used as learning tools in science education (Abdullah et al, 2014;Abdullah et al, 2020;Aleksandrov et al, 2013;Aslani & Moghiman, 2019;Fallahnezhad & Reza Nazif, 2019;Nelson et al, 2020;Wibowo et al, 2016;Will et al, 2017). Contextual approaches need to be involved instead of textual practices in conducting science learning to become more understandable and fun, especially in physics subject (Dale et al, 2019;Jelicic et al, 2022;Sokolowski, 2021).…”

Section: Introductionmentioning

confidence: 99%

Derivation of Newton's law of cooling and heating: Heating the water then cooling it down naturally to the room temperature

Wibowo

Ulya

Farizi

et al. 2023

Momentum: Physics Education Journal

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A simple experiment has been conducted to study Newton's law of cooling and heating by observing the nature of the increasing and decreasing water temperature by utilizing a data logger, a thermocouple, a pan, a hot plate, and water. The uncovered pan contained water which was subsequently heated on a hot plate. The water was heated at ambient temperature and normal atmospheric pressure to see that the temperature rose exponentially. Conversely, the temperature of hot water decreased exponentially when the heat source was switched off. The model for increasing and decreasing water temperature is following the Newton's law of cooling and heating. It was proven that the experimental data highly fit theoretical models. The temperature increment constant (ka) and the temperature decrement constant (kd) determined the rate of temperature changes. Low values of ka and kd led to the slow change in the temperature, either the increase or the decrease in the water temperature and vice versa. The ka > kd was observed for all given conditions so that the increasing rate in the water temperature was faster than its decrease. The result of this study can be applied as an example of contextual learning of physics for university students.

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Bending of sparklers

Cited by 9 publications

References 4 publications

Studying the optoelectronic properties and emission quenching dynamics of poly‐TPD by incorporating ZnO nanoparticles and multiwalled carbon nanotubes

Studying the optoelectronic properties and emission quenching dynamics of poly‐TPD by incorporating ZnO nanoparticles and multiwalled carbon nanotubes

A Sarong rolled around a body demonstrates that the force for separating two sheets joined by folding and rolling is very large

Derivation of Newton's law of cooling and heating: Heating the water then cooling it down naturally to the room temperature

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