SPEKTRA Volume 9 issue 1 contains five papers: 1) Effect of 30˚C Electrolyte Temperature on The Sensitivity Cu/Ni, 2) Pair Correlation Influence on Superconductors Josephson Penetration Depth, 3) Development of a Real-Time Gas Concentration Measurement System Using Internet of Things-Based Monitoring, 4) Rainfall Classification Analysis Using Naïve Bayes Classifier Based on Air And Wind Temperatures in Serang City, and 5) Impacts of Gorkha Earthquakes: A Comprehensive Study.

The articles in this issue from 2 countries: Indonesia and Nepal. We are grateful for all the contributions of the authors. We also appreciate the professional reviewers who are an essential part of this issue.