Analisis Pengaruh Pengelasan SMAW Preheat Pada Sambungan Las Baja Karbon Rendah Terhadap Kekuatan Tarik Dan Struktur Mikro
.
Profil penulis
AMOS
6 karya publik ditemukan.
2026: 22024: 22021: 2
Analisis Pengaruh Pengelasan SMAW Preheat Pada Sambungan Las Baja Karbon Rendah Terhadap Kekuatan Tarik Dan Struktur Mikro
.Penelitian ini bertujuan untuk menganalisis pengaruh perlakuan panas awal (preheat) pada proses pengelasan Shielded Metal Arc Welding (SMAW) terhadap kualitas sambungan baja karbon rendah. Fokus utama penelitian adalah membandingkan hasil pengelasan antara kondisi tanpa perlakuan panas (non-preheat) dan dengan suhu preheat 200°C terhadap cacat permukaan (penetrant test), kekuatan tarik, dan perubahan struktur mikro. Hasil penelitian menunjukkan bahwa pemberian preheat 200°C efektif mencegah terjadinya distorsi pada spesimen dibandingkan tanpa perlakuan panas. Pada uji penetrant, kedua kondisi masih menunjukkan adanya cacat porositas pada pengelasan Preheat 200°C dan cacat undercut, spatter pada pengelasan tanpa perlakuan panas. Secara mekanik, spesimen tanpa perlakuan memiliki kekuatan tarik rata-rata tertinggi sebesar 135 MPa dengan regangan 33% (elongation). Sebaliknya, spesimen dengan preheat 200°C mengalami penurunan kekuatan tarik menjadi 122 MPa, namun nilai regangan (elongation) meningkat menjadi 34%. Analisis struktur mikro menunjukkan bahwa hasil dari perlakuan panas preheat menghasilkan struktur butir yang besar karena laju pendinginan yang lebih lambat.
Penegakan hukum pidana terhadap terhadap pelaku pelanggaran pembuangan sampah di kota Tarakan
Membuang sampah sembarangan merupakan tindakan yang dilarang. Secara hukum pidana tersebut merupakan pelanggaran yang dapat dikenakan sanski administratif maupun sanski pidana sesuai hukum undang-undang yang digunakan. Pemerinta daerah kota tarakan dalam upaya menjaga lingkungan dan menertipkan masyrakat, telah menerbitkan peraturan daeah kota tarakan No 10 Tahun 2012 tentang pengelolaan sampah. Penelitian ini bertujuan untuk mengetahui bagaimana penegakan sanski pidana terhadap pelaku pembuangan sampah sembarangan dikota tarakan. Penelitian ini menggunakan metode pendekatan empiris, dengan pendekatan kualitatif.Hasil penelitian menunjukan bahwa penerapan sanski pidana terhadap pelaku pembuangan sampah sembarangan oleh dinas lingkungan hidup dan satpol pp kota tarakan belum optimal. Penerapan sanski pidana belum terlaksana dengan baik karena masih terkendala oleh berbagai faktor penegakan hukum. Koordinasi antara dinas lingkungan hidup dan satpol pp kota tarakan dalam penegakan hukum terhadap pelaku pelanggaran pembuangan sampah sembarangan sangat diperlukan agar penegakan hukum terhadap pelanggran sampah dikota tarakan dapat dilaksanakan dengan efektif dan ketertiban masyrakat dan dapat tercapai.
Penegakan hukum pidana terhadap pelaku pelanggaran pembuangan sampah di kota Tarakan
Membuang sampah sembarangan merupakan tindakan yang dilarang. Secara hukum pidana tersebut merupakan pelanggaran yang dapat dikenakan sanski administratif maupun sanski pidana sesuai hukum undang-undang yang digunakan. Pemerinta daerah kota tarakan dalam upaya menjaga lingkungan dan menertipkan masyrakat, telah menerbitkan peraturan daeah kota tarakan No 10 Tahun 2012 tentang pengelolaan sampah. Penelitian ini bertujuan untuk mengetahui bagaimana penegakan sanski pidana terhadap pelaku pembuangan sampah sembarangan dikota tarakan. Penelitian ini menggunakan metode pendekatan empiris, dengan pendekatan kualitatif.Hasil penelitian menunjukan bahwa penerapan sanski pidana terhadap pelaku pembuangan sampah sembarangan oleh dinas lingkungan hidup dan satpol pp kota tarakan belum optimal. Penerapan sanski pidana belum terlaksana dengan baik karena masih terkendala oleh berbagai faktor penegakan hukum. Koordinasi antara dinas lingkungan hidup dan satpol pp kota tarakan dalam penegakan hukum terhadap pelaku pelanggaran pembuangan sampah sembarangan sangat diperlukan agar penegakan hukum terhadap pelanggran sampah dikota tarakan dapat dilaksanakan dengan efektif dan ketertiban masyrakat dan dapat tercapai.
AN ANALYSIS OF THE EIGHTH GRADES STUDENTS’ DIFFICULTIES ON LEARNING ENGLISH VOCABULARY OF SMP NEGERI 4 TARAKAN
The purpose of this study was to analyze the difficulties experienced by the eighth grade students of SMP Negeri 4 Tarakan in learning English vocabulary. It used a descriptive qualitative method. The subjects of this study were the eighth grade students of SMP Negeri 4 Tarakan in the 2020/2021 academic year. The total student population was 343. The sample was 52 students selected using a simple random sampling technique. Data collection was carried out using test documents, questionnaires, and interviews. The test document was used to analyze the types of difficulties students had in learning vocabulary. The questionnaire was used to analyze the students' most dominant difficulties in learning vocabulary. Interviews were used to find out more about students’ difficulties in learning vocabulary. Data were analyzed using descriptive analysis to analyze student difficulties in the form of vocabulary tests and the percentage of student difficulties in the form of questionnaire. The results of this study indicated that; first, from the results of the vocabulary test, there were 10.96% of students who had difficulty in the aspect of meaning. Whereas in the grammar aspect, there were about 43.6% of students who have difficulties. Second, the results of the questionnaire show that 55.8% of students could understand aspects of meaning and 46.6% of students could understand aspects of grammar. Third, the results of interviews with the English teacher showed that the students had a lot of difficulties in grammar. Thus, it was concluded that there are two types of student difficulties in learning vocabulary, namely meaning and grammar. Second, the most dominant difficulty was grammar.
AN ANALYSIS OF THE EIGHTH GRADES STUDENTS’ DIFFICULTIES ON LEARNING ENGLISH VOCABULARY OF SMP NEGERI 4 TARAKAN
The purpose of this study was to analyze the difficulties experienced by the eighth grade students of SMP Negeri 4 Tarakan in learning English vocabulary. It used a descriptive qualitative method. The subjects of this study were the eighth grade students of SMP Negeri 4 Tarakan in the 2020/2021 academic year. The total student population was 343. The sample was 52 students selected using a simple random sampling technique. Data collection was carried out using test documents, questionnaires, and interviews. The test document was used to analyze the types of difficulties students had in learning vocabulary. The questionnaire was used to analyze the students' most dominant difficulties in learning vocabulary. Interviews were used to find out more about students’ difficulties in learning vocabulary. Data were analyzed using descriptive analysis to analyze student difficulties in the form of vocabulary tests and the percentage of student difficulties in the form of questionnaire. The results of this study indicated that; first, from the results of the vocabulary test, there were 10.96% of students who had difficulty in the aspect of meaning. Whereas in the grammar aspect, there were about 43.6% of students who have difficulties. Second, the results of the questionnaire show that 55.8% of students could understand aspects of meaning and 46.6% of students could understand aspects of grammar. Third, the results of interviews with the English teacher showed that the students had a lot of difficulties in grammar. Thus, it was concluded that there are two types of student difficulties in learning vocabulary, namely meaning and grammar. Second, the most dominant difficulty was grammar.