Abstract:This study aims to Test Wastewater Quality Using the Mpn (Most Probable Number) Method to Detect Total COLIFORM Bacteria. This study uses laboratory analysis, which aims to provide an overview of the microbiological quality…
ity of wastewater based on the presence and number of Coliform bacteria. The working principle of the Most Probable Number (MPN) method in detecting total Coliform bacteria in wastewater is carried out semi-quantitatively by detecting microbial growth through lactose fermentation which produces gas or turbidity in selective liquid media. The implementation procedure includes a presumptive test stage using Lactose Broth (LB) media, a confirmatory test with Brilliant Green Lactose Bile Broth (BGLB) media, and determining the final value by matching the combination of positive tubes with the standard MPN table. From the results of laboratory testing on three domestic wastewater samples (1224 AL, 1225 AL, and 1226 AL), it was found that all samples showed negative results with a combination of 0-0-0 tubes in the presumptive test. This indicates that the tested sample does not contain Total Coliform bacteria or has a value of less than 1000 MPN/100 mL, so that its microbiological quality is declared very good and has met the quality standard threshold set by the government through the Minister of Environment Regulation No. 5 of 2014 and PP RI No. 22 of 2021
Abstract:Processing leaves to make compost is generally still done by chopping using a machete, or many are not chopped, making it difficult for the leaves to decompose or rot. This research aims to determine the results of chopping…
ing using a single blade and by varying the size of the blade and varying the rotation speed of the machine. The benefit of this research is to determine the influence of leaf chopper machine components, especially the number of leaf chopper blades, using descriptive qualitative research methods with data collection methods, literature studies and observations. The research location is in the HKBP Nommensen University Laboratory workshop, Pematang Siantar, North Sumatra. The research process took the form of testing carried out in several stages, namely using a single blade by varying the length of the blade and varying the rotation speed of the machine to compare the speed and chopping results. Three trials were carried out each with varying blade lengths of 30cm, 35cm and 40cm and rotation variations of 2500rpm, 3000rpm and 5000rpm. The results are in the form of a comparison of speed and counting results between variations of 30cm, 35cm and 40cm. The test results more effectively lead to variations in blade size of 40cm. And the results of testing the engine rotation speed which is more effective leads to a rotation speed variation of 5000rpm.
Abstract:Information is the result of data processing in a form that is more useful and more meaningful for the recipient that describes real events (facts) that are used for decision making. The music information system website…
aims to provide various communication and information services about music. The information system used by the music community so far is considered slow and complicated. Both musicians and producers have difficulty communicating directly and the number of individuals who can communicate directly is relatively small. Therefore, the current system cannot meet the demands of the information needs, it needs to be developed so that it can display information and communication facilities about music directly and quickly. In designing the music information system website using Php & MySql Script. Where in the design of this information system itself uses a Database where the use of the Database itself is as a media that manages all data and a place to store the data itself later. The information system itself is designed so that musicians and producers can create their own profiles. This information system also provides communication services about music. The final result achieved from this music information system is as a communication service for the music community, Sharing Content, publication, and promotion from musicians to the public and producers.
Abstract:Anak adalah generasi penerus masa depan bangsa dan Negara Indonesia, oleh karena itu anak memerlukan pembinaan dan bimbingan khusus, baik dari keluarga, masyarakat, maupun pemerintah agar dapat tumbuh kembang secara maksimal.…
imal. Dalam hal ini pemerintah telah berupaya memberikan perlindungan hukum terhadap anak-anak Indonesia dengan meratifikasi Konvensi Hak Anak serta menerbitkan berbagai peraturan perundangan yang merumuskan perlindungan terhadap anak-anak yang berhadapan dengan hukum, yang salah satu implementasi adalah dengan lahirnya Undang Undang Nomor 23 Tahun 2002 Tentang Perlindungan Anak. Salah satu kasus yang diangkat menjadi fenomena dalam dunia kriminalitas dan konteks perlindungan anak di Indonesia yang memerlukan solusi dalam penyelesaiannya adalah kasus genk motor khususnya yang terjadi di Kota. Kasus genk motor yang terjadi telah merugikan banyak pihak dan mengganggu keamanan dan ketertiban kota Pekanbaru karena para anggota genk motor ini melakukan tindak pidana yang mengancam keselamatan masyarakat. Namun adanya penyelesaian sudut pandang yang berbeda dari Pihak Kepolisian dengan Pihak Lembaga Perlindungan Anak dalam menangani keputusan dalam kasus tersebut
Children are the future generation of the Indonesian nation and state, therefore children need special guidance and guidance, both from family, society and the government so that they can grow and develop optimally. In this case, the government has attempted to provide legal protection for Indonesian children by ratifying the Convention on the Rights of the Child and issuing various laws and regulations that formulate protection for children in conflict with the law, one of the implementations of which is the enactment of Law Number 23 of 2002 About Child Protection. One of the cases that has become a phenomenon in the world of crime and the context of child protection in Indonesia which requires a solution is the motorbike gang case, especially the motorbike gang case harmed many parties and disrupted the security and order because members of this motorbike gang committed criminal acts that threatened the safety of the people. However, there are different points of view from the Police and the Child Protection Agency in handling decisions in this case.
Abstract:This classroom action research aims to improve students’ understanding of norms and rules in everyday life through the use of picture-based learning media in Grade II UPT SD Negeri 74 Bontorita II during the 2025/2026 academic…
academic year. The study was conducted in two cycles consisting of planning, action, observation, and reflection. The participants were 22 students who were involved in learning activities using instructional pictures and number-pocket media to strengthen conceptual understanding. Data were collected through observation sheets, learning outcomes tests, and teacher reflections. The findings indicate a significant improvement in students’ learning outcomes and participation. Initial observations showed low understanding of norms and rules, reflected in students’ low discipline, responsibility, and adherence to class regulations. After the implementation of picture media in Cycle I, students’ average score increased from the pre-cycle score of 46.2% to 71.1%. In Cycle II, after using more varied and engaging visual media, students’ average score further improved to 79,36%, surpassing the minimum completeness criteria. The use of picture media was effective because it facilitated concrete understanding, increased motivation, and encouraged active engagement. The study concludes that picture-based media enhances students’ cognitive, affective, and behavioral competencies in learning. It is recommended that teachers integrate more innovative visual media to create meaningful, interactive, and enjoyable learning experiences in civics education and other subjects