This research is motivated by the importance of critical thinking skills in 21stcentury education. The purpose of this study is to determine the critical thinking skills of elementary school students and the factors that can influence it in Sukoharjo 02 Elementary School, Sukoharjo Regency. This study included descriptive qualitative research. The subjects of this study were class VI students who were selected by purposive sampling technique. Data collection is done through observation, interviews, and tests. Data analysis is done by flow analysis. Based on the results of research and discussion, information obtained from 6 of 28 students or about 21% of students whose grades can reach 70, the minimum completeness value 70. The average score of all students is 52. It shows that the students' ability to think critically is still low. Based on several indicators of critical thinking shows the average value of students answering interpretation questions, namely 46.43, analysis of 50.89, inference 65.18, and explanation 45.54. The low average value is caused by several factors, namely: students answer with short answers so the answers become incorrect, there are students' misconceptions because students' understanding from the beginning is wrong, and the most often done by the students is to answer systematically.

Penelitian untuk mengetahui pengaruh sudut kampuh V pengelasan SMAW terhadap sifat mekanis sambungan las pada material pipa API 5L X46 telah dilakukan. Proses pengelasan dilakukan dengan sambungan butt-joint kampuh V tunggal menggunakan material pipa API 1104 5L grade X46 dengan tebal pipa 12,7 mm. Sudut kampuh yang digunakan adalah 45º, 50º, 55º, 60º, 65º, 70º, dan 75º. Sambungan lasan kemudian dilakukan beberapa pengujian meliputi inspeksi visual, uji NDT RI, uji metalografi menggunakan standar ASTM E340-15, uji kekerasan menggunakan standar ASTM E92-82, dan uji bending menggunakan standar API 1104. Hasil penelitian menunjukkan bahwa semakin besar sudut kampuh las maka heat input dan waktu proses semakin besar. Secara umum kekerasan HAZ dan WM meningkat seiring dengan peningkatan sudut kampuh. Nilai kekerasan sebesar 135,73 VHN pada HAZ, dan 146,19 VHN pada WM diperoleh pada sudut kampuh 75o. Tegangan bending maksimum pada root bend dan side bend test meningkat seiring dengan kenaikan sudut kampuh dan berturut-turut tercapai pada variasi sudut kampuh 60º sebesar 5.685 MPa dan 4.222 MPa, kemudian tegangan lentur menurun bila sudut kampuh membesar. Sudut kampuh 60o merupakan sudut kampuh optimal dari segi sifat mekanis sambungan dan produktifitas proses pengelasan.

This research describes the improvement of computer network performance with bandwidth management in Kemurnian II Senior High School. The main issue of this research is the absence of bandwidth division on computer, which makes user who is downloading data, the provided bandwidth will be absorbed by the user. It leads other users do not get the bandwidth. Besides that, it has been done IP address division on each room, such as computer, teacher and administration room for supporting learning process in Kemurnian II Senior High School, so wireless network is needed. The method is location observation and interview with related parties in Kemurnian II Senior High School, the network analysis has run and designed a new topology network including the wireless network along with its configuration and separation bandwidth on microtic router and its limitation. The result is network traffic on Kemurnian II Senior High School can be shared evenly to each user; IX and IIX traffic are separated, which improve the speed on network access at school and the implementation of wireless network.