SAINFIS: Jurnal Sains Fisika

ANALISIS KARAKTERISTIK SENSOR THERMISTOR NTC-10D-15 DAN PTC-16P PADA PENGUKURAN SUHU AIR

2024-08-18T13:18:15+00:00

Sensor suhu mendeteksi perubahan panas pada suatu benda. Thermistor NTC-10D-15 dan PTC-16P adalah contoh sensor suhu murah yang sering digunakan. Studi ini bertujuan untuk mengetahui fitur thermistor jenis ini. Perancangan adalah tahap pertama, kemudian pengambilan dan pengolahan data. Ohmeter akan mengukur perubahan resistansi dibandingkan dengan perubahan suhu air. Kegiatan pengukuran termistor NTC-10D-15 dan PTC-16P pada media air menunjukkan perbedaan yang signifikan dalam karakteristik. NTC-10D-15, yang resistansinya menurun dengan meningkatnya suhu, menunjukkan sensitivitas yang tinggi terhadap perubahan suhu pada rentang tertentu serta stabil dalam karakteristiknya. Hasil pengukuran NTC-10D-15 memberikan regresi yang baik dengan persamaan eksponensial yang mendekati kalibrasi, meskipun terdapat error sebesar 0,11% pada suhu 58°C dan 21,25% pada suhu 100°C dengan sensitivitas sebesar 0,008 per derajat celcius. Di sisi lain, PTC-16P, yang resistansinya meningkat dengan meningkatnya suhu, menunjukkan respons yang tidak linear terhadap perubahan suhu, terutama pada suhu yang lebih tinggi. Regresi pengukuran PTC-16P lebih rendah dibandingkan dengan NTC-10D-15, dan terdapat error sebesar 0,25% pada suhu 46°C serta 9,7% pada suhu 100°C dengan sensitivitas sebesar 0,019 per derajat celcius. Analisis error menunjukkan bahwa keduanya rentan terhadap kesalahan pengukuran karena faktor seperti non-linearitas, hysteresis, variasi produksi, serta efek termal dan penempatan.

ANALYSIS OF TENSILE STRENGTH AND EFFORTLESSNESS OF BIODEGRADABLE PLASTIC WITH THE ADDITION OF TiO2

2024-08-18T13:21:07+00:00

Biodegradable plastic (bioplastic) is a very potential candidate because it is generally biodegradable. Starch-based bioplastics have several advantages, including renewable, biodegradable and easy to process. The aim of this research is to determine the potential of durian seed waste starch with the addition of TiO₂ as an environmentally friendly bioplastic. The method used is by measuring thickness, tensile strength testing and creep strength testing. This research resulted in the best material being obtained in samples with a thickness of 0.2 mm, a tensile strength of 22.96 % and an elongation strength of 25.55 %. The results obtained are biodegradable plastic made from Durian seed waste starch with the addition of TiO₂ which can be an alternative to plastic. The basic waste materials of course the results obtained in this research are environmentally friendly, safe for health and of course have affordable prices for all levels of society.

PEMANFAATAN PARTIER TEC-12706 SEBAGAI GENERATOR TERMAL ELEKTRIK PADA PROTOTIPE KINCIR ANGIN MINI DENGAN MOTOR DC 5V

2024-08-18T13:25:51+00:00

One of the alternative energy technologies that can be utilized as renewable energy is the utilization of thermoelectric generators. Besides its simple application, thermoelectric generators do not produce residues that can harm the environment, as their principle of operation is based on the temperature difference between two different heat sources, creating a flow of heat energy from the hotter source to the cooler one. Thermoelectric generators utilize thermoelectric devices, such as thermoelectric modules or thermocouples, which exploit the Seebeck effect to generate electricity. In this study, the Partier Tec-12706 was employed as a thermoelectric generator in a prototype of a mini wind turbine with a 5V DC motor. Through this research, a prototype of a thermoelectric generator was successfully designed and tested for the magnitude of temperature changes with the resulting power output. The study utilized a DC motor connected in series as a converter of electrical energy from the Partier TEC-12706 into mechanical energy capable of driving the mini wind turbine used in the research. The research findings indicate that the thermoelectric generator using Partier Tec-12706 can generate electrical power ranging from 3.92 to 6.4 watts. Furthermore, it is evident that the greater the change in heat value, the greater the power produced by the generator. Further testing demonstrates that the device can rotate a DC motor with a voltage of 3 to 6 volts, ultimately enabling the mini wind turbine in the prototype to rotate. These findings highlight the potential of utilizing Partier Tec-12706 as an effective thermoelectric generator in generating electrical energy from heat value changes, thus contributing to the development of environmentally friendly renewable energy technologies.

Pengembangan Augmented Reality Berbasis Android Dalam Pembelajaran Ipa SMP/mts pada materi sistem pencernaan

2024-08-26T10:38:31+00:00

The purpose of this research was to produce Android-Based Augmented Reality in Science Learning on Digestive System Material at Junior High School that met valid and practical criteria, and to find out students' responses to media. The type of research used is research and development (research and development) the development model of Sugiyono (2019). This research step is limited to the seventh step, namely product revision, this is due to the limitations of the researcher. The data in this study used qualitative and quantitative data with data collection techniques used were observation, interviews, questionnaires and documentation using data analysis techniques used were descriptive qualitative and descriptive quantitative. The results of the validity of the android-based augmented reality product have been declared very valid based on the results of validation by media experts obtaining a value of 82%, learning material experts declared valid by obtaining a value of 78% and by linguists obtaining a value of 90% very valid. The level of practicality by the teacher which is stated to be very practical to use for students in learning by obtaining a value of 94%. The response was very good from 25 students of class VIII at Islamic State Junior High School 3 Pekanbaru by obtaining a score of 90% for android-based augmented reality in science learning on the material of the human digestive system at Junior High School. Based on expert judgment and limited tests, android-based augmented reality in science learning on digestive system material at Junior High School is feasible to use in science learning