Muhammadiyah University of Surakarta
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Rancang Bangun Prototipe Kontrol Kolam Lele Bertenaga Surya
Get PDFCatfish farming is one of the most popular sectors in Indonesia's fisheries industry due to its high economic value and relatively short harvest cycle. However, the success of catfish farming heavily depends on the quality of pond water, such as temperature, pH, turbidity, and total dissolved solids (TDS). Manual water quality monitoring is time-consuming, labor-intensive, and often inaccurate. Therefore, this study aims to develop a prototype of an energy-efficient, Internet of Things (IoT)-based automatic monitoring and control system for catfish ponds, utilizing renewable energy from solar panels. The system uses an ESP32 microcontroller as the control center, integrated with four main sensors: DS18B20 (temperature), pH sensor, turbidity sensor, and TDS sensor. Sensor data is transmitted to an MQTT broker using the MQTT protocol, which is then forwarded to a web-based monitoring application in real-time. An automatic valve control feature is added to drain the pond water automatically if two out of three main parameters exceed the specified quality thresholds. The system's power supply is hybrid: the monitoring and control devices use a 20WP solar panel and a 12V 8Ah battery, while the solenoid valve is powered by an AC power source to ensure sufficient lifting torque. The INA219 and PZEM-017 sensors are used to monitor power consumption and voltage periodically. Test results show the system operates as designed with good accuracy: TDS sensor (maximum error 1.97%), pH (2.5%), temperature (1.65°C), turbidity reaching 45.20 NTU, and INA219 current sensor (0.90%). The automatic drainage system also functions effectively based on threshold logic. The entire system has proven to be accurate, efficient, and capable of real-time monitoring of pond water quality, thereby significantly supporting cultivation efficiency and energy savings
Sistem Monitoring Suhu Dan Kelembapan Udara Serta Penyiraman Otomatis Tanaman Bonsai Berbasis Internet Of Things
Get PDFBonsai plants are ornamental plants with unique shapes and charming appeal, making them popular among many collectors. In addition, bonsai plants also have high commercial value because they can survive for hundreds of years if properly cared for. Bonsai plant care includes repotting, watering, fertilizing, and pruning. The watering process significantly affects soil moisture, as soil moisture is one of the environmental factors influencing soil biology. Furthermore, bonsai plants require optimal temperature, air humidity, and soil pH for their growth. This study utilizes the Internet of Things (IoT) to monitor soil moisture, temperature, air humidity, and is equipped with a soil pH meter, as well as automatically controlling devices such as watering pumps and fertilizer pumps. The system uses an ESP32 microcontroller, the Blynk application, and a spreadsheet website to store data generated by the sensors. This study focuses on observing and collecting data from soil moisture, temperature, air humidity, and soil pH sensors. The results of the DHT22 sensor test showed a temperature error percentage of 4%, an air humidity error percentage of 8%, and the soil moisture sensor classification was the same as that of the comparison tool, the soil pH analyzer. The results of testing the soil pH sensor in pot 1 showed an error percentage of 9,86%, the results of testing the soil pH sensor in pot 2 showed an error percentage of 9,62%, and the results of testing the soil pH sensor in pot 3 showed an error percentage of 10,35%. The field test results over four days showed that the system operated as expected; when the soil moisture sensor detected a value of 52%, the water pump activated
Sistem Informasi Monitoring Hasil Panen Ikan Lele Berbasis Web
Get PDFThe transformation of technological development is increasingly rapid, especially in the field of information systems, information is something that is effective throughout the world and many use, among other things, web-based information. The previous catfish information system was still very conventional and the financial reports lacked a mathematical or very transparent system. This web-based catfish harvest monitoring information system application is a solution to help catfish farmers manage their harvest efficiently. This system is designed to support the process of recording harvest data more easily and efficiently. This catfish harvest monitoring information system uses the waterfall method. The waterfall method is a method that uses a sequential approach system such as a waterfall, which runs systematically from top to bottom starting from the analysis, design, coding, testing and maintenance stages. This website-based catfish harvest monitoring information system was successfully built using the PHP programming language supported by Bootstrap 5 CSS. The database used is MYSQL. The website-based catfish harvest monitoring information system has been tested using the Black-Box testing method and the SUS (System Usability Scale) method resulting in a score of 73, which means it is acceptable and recommended for use
Motivasi Berprestasi Pada Siswa SMA Ditinjau dari Efikasi Diri dan Dukungan Teman Sebaya
Get PDFFrom a psychological perspective, education plays an important role as a path to personal growth for each individual. Of course, this education is accompanied by psychological support related to character and personality development. However, if the educational process is not accompanied by motivation to achieve, this can have a negative impact on the achievements made. This study aims to investigate the influence of self-efficacy and peer support on the need for achievement (achievement motivation) among high school students. The research method employed is a quantitative approach, with data collection conducted using relevant scales: the achievement motivation scale, the self-efficacy scale, and the peer support scale. The research sample consisted of 207 grade XII students at SMA Islam Sudirman Ambarawa, selected using cluster random sampling. Data analysis was conducted using multiple linear regression, accompanied by classical assumption tests. The results of the study indicate a significant influence between self-efficacy and peer support on the need for achievement, with a Sig. value of 0.000 < 0.05 and an F-calculated value of 93.711. Significantly, self-efficacy has a positive influence with a Sig. value of 0.000 and a t- calculated value of 11.554, while peer support also has a positive influence with a Sig. 0.000 and t-value of 3.628. Overall, these independent variables contributed 47.9% to the effect, while 52.1% was influenced by factors outside the scope of this study. The self-efficacy variable contributed 40.7% to the effect, and peer support contributed 7.1%
Peran Kepemilikan Manajerial Sebagai Variabel Moderasi Pada Pengaruh Modal Kerja Terhadap Profitabilitas
Get PDFThis study aims to analyze the effect of working capital components, namely cash turnover, receivables turnover, and inventory turnover, on profitability, as well as the role of managerial ownership as a moderating variable. The object of this research is Food and Beverage sector companies listed on the Indonesia Stock Exchange (IDX) during the 2021–2023 period. The sample was selected using a purposive sampling method based on specific criteria, and after a filtering process and outlier removal, 89 valid data observations were obtained. The analytical method used in this research is multiple linear regression to test the direct effect of each independent variable on profitability, and moderated regression analysis (MRA) to test the moderating role of managerial ownership. Data analysis was conducted using SPSS software.
The results show that receivables turnover has a significant effect on profitability, indicating that the more efficiently the company manages its receivables, the more it contributes to profit growth. In contrast, cash turnover and inventory turnover do not have a significant effect on profitability. This suggests that the management of cash and inventory may not directly impact profitability during the observation period. In the moderation test, managerial ownership is proven to strengthen the effect of cash turnover and receivables turnover on profitability, indicating that when managers hold ownership stakes, they tend to manage working capital more carefully to improve company performance. However, managerial ownership does not significantly affect the relationship between inventory turnover and profitability.
This study concludes that effective working capital management, especially in receivables, along with the active role of managerial ownership, can enhance company profitability. These findings are expected to serve as a useful reference for company management, investors, and academics in understanding the dynamics between working capital, managerial ownership, and financial performance
Aktivitas Siber Pada Akun Instagram @Zaskiadyamecca Terhadap Palestina
Get PDFThe development of social media has created a new space for social participation through cyber activities, including in supporting humanitarian issues. Influencers now play a role not only in product promotion, but also in building public opinion and inviting real actions such as donating. This study aims to describe how Zaskia Adya Mecca's credibility as an influencer is formed through her cyber activities on Instagram which can play a role in building her followers' interest in donating to Palestine. The research approach used is descriptive qualitative with data collection techniques through observation and documentation of Instagram content uploads. The analysis was carried out using Hovland's Source Credibility theory which includes three dimensions: trustworthiness, expertise, and attractiveness. The results of the study show that Zaskia's credibility is formed through consistency in raising the issue of Palestine, direct involvement in the field, and emotional closeness to her followers. Cyber activities carried out strategically and authentically also help shape positive perceptions and encourage donation participation from the audience
Hubungan Dukungan Sosial dan Coping Stress dengan Burnout Akademik pada Siswa SMK
Get PDFThis study aimed to examine the relationship between social support and stress coping with academic burnout among vocational high school students. A quantitative correlational approach was employed, involving 64 students from SMK Duta Karya Kudus selected through simple random sampling. The research instruments consisted of three scales: the social support scale, the stress coping scale, and the academic burnout scale. Data were analyzed using multiple linear regression. The analysis results showed that, simultaneously, there was a significant relationship between social support and stress coping with academic burnout (R = 0.456; p < 0.05), with an effective contribution of 20.8%. Partially, social support showed a significant negative relationship with academic burnout (r = -0.429; p < 0.05), and stress coping also showed a significant negative relationship with academic burnout (r = -0.258; p < 0.05). These findings indicate that the higher the social support and stress coping abilities of students,
the lower their level of academic burnout. Therefore, social support and adaptive coping strategies are important factors in preventing academic burnout among vocational high school students
Redesain Kawasan Olahraga Sanaman Mantikei Palangka Raya Dengan Pendekatan Arsitektur Futuristik
Get PDFThe Sanaman Mantikei Sports Area in Palangka Raya City serves as a strategic public space that supports sports, recreation, and social interaction. However, the existing condition of the area has experienced degradation in terms of infrastructure, facility quality, and accessibility for vulnerable groups. This study aims to redesign the area using a futuristic architectural approach that is adaptive, innovative, and sustainable. The methods employed include literature review, field observation, interviews, documentation, and post-occupancy evaluation to identify problems and user needs. The data were analyzed descriptively and supported by comparative studies. The design outcome proposes a recreational sports area divided into several functional zones, including competitive sports, recreation, social interaction, and green pathways. The findings conclude that implementing futuristic architectural design can optimize the function of the area as an inclusive, healthy, and responsive public space for contemporary urban communities
Hubungan Fear Of Missing Out (Fomo) Dan Kontrol Diri Dengan Perilaku Impulsive Buying Pada Mahasiswa Pengguna Paylater
Get PDFThis study aims to determine the relationship between fear of missing out (FOMO) and self-control on impulsive buying among university students who use paylater services. The subjects were 97 active students aged 18–25 years, selected using purposive sampling. Data were collected using FOMO, self-control, and impulsive buying scales. Data analysis was performed using multiple linear regression. The results showed a significant relationship between FOMO and self-control with impulsive buying behavior (R = 0.644; sig. < 0.05). FOMO was found to have a significant positive relationship with impulsive buying, while self-control had a significant negative relationship. The effective contribution of FOMO to impulsive buying was greater than that of self-control. These findings indicate that FOMO has a more dominant influence than self-control on impulsive buying behavior among paylater user students.
Keywords: impulsive buying, fear of missing out, FOMO, self-control, paylate
Analisis Pengaruh Panjang Serat Tali Strapping Pada Pola Keruntuhan Dan Kuat Lentur Beton Berserat
Get PDFPenambahan serat ke dalam beton juga disebut juga dengan beton berserat, dengan penambahan serat diharapkan dapat meningkatkan dari segi kekuatan tarik dan juga lentur dari beton. Penelitian ini bertujuan untuk mengetahui pola keruntuhan dan kekuatan lentur beton yang ditambahkan serat dengan ukuran serat 1,5×20 mm, 1,5×25 mm, dan 1,5×30 mm. Dengan penambahan variasi serat yang digunakan untuk mengetahui efek pada pola keruntuhan beton dan meningkatkan kuat lentur dari beton-beton. Dari hasil pengujian, beton dengan variasi tersebut mempengaruhi pola keruntuhan dari beton. Beton normal mengalami keruntuhan secara mendadak, akan tetapi beton berserat mengalami keruntuhan akan tetapi tidak terjadi secara mendadak karena tertahan oleh serat yang ditambahkan. Pengujian beton serat tali strapping ini didapatkan nilai kuat lentur pada beton berusia 28 hari secara berurutan yakni 4,67 MPa, 4,84 MPa, dan 4,98 MPa, dengan nilai kuat lentur dari beton normal sebesar 4,22 MPa. Dari hasil yang didapatkan, nilai kuat lentur terbaik terdapat pada variasi dengan ukuran 1,5×30 mm. Hasil dari pengujian yang sudah dijabarkan bahwa serat dengan panjang 20 mm sudah memberikan pengaruh yang baik pada pola keruntuhan dan peningkatan kekuatan lentur pada balok, dengan menambahkan panjang dari serat dapat meningkatkan nilai dari kuat lentur dengan tetap memperhatikan nilai rasio serat