Extreme rainfall in Indonesia has led to natural disasters in many areas including Salatiga City. Many human activities depend on the amount of rainfall that falls on the earth's surface. In the field of civil engineering, research on rainfall is very common because many activities related to civil engineering use rainfall data such as for water resource management, drainage development, dam construction and other building construction. This study aims to determine the amount of rainfall intensity and IDF curves in Salatiga City for return periods of 2 years, 5 years, 10 years, 25 years, 50 years and 100 years. The data used in this study is the maximum daily rainfall data collected from Salatiga Central Bureau of Statistics (BPS). The type of distribution selected in this study is the Log Pearson Type III probability distribution. The results of the analysis show that the highest rainfall intensity occurs at a short duration (5 minutes) in the 100-year return period of 106.66 mm/hour and the results of the IDF curve show that the shorter the rainfall time, the higher the rainfall intensity while the longer the rainfall time, the smaller the rainfall intensity at each return period T.

Produksi daging sapi merupakan salah satu komponen penting dalam memenuhi kebutuhan protein hewani di Indonesia. Namun, distribusi dan tingkat produksi yang tidak merata di berbagai provinsi menimbulkan tantangan dalam pengelolaan dan perencanaan yang efektif. Penelitian ini bertujuan untuk memprediksi produksi daging sapi di Indonesia untuk tahun 2024 dan 2025 dengan menggunakan model prediksi berbasis Random Forest Regression, yang memanfaatkan data produksi historis dari tahun 2018 hingga 2023. Metode yang digunakan melibatkan pengumpulan data produksi daging sapi dari berbagai provinsi di Indonesia, diikuti dengan preprocessing data dan pembangunan model prediksi menggunakan algoritma Random Forest. Evaluasi model dilakukan dengan menggunakan metrik Mean Squared Error (MSE) dan R-squared (R²) untuk menilai akurasi dan kemampuan model dalam menjelaskan variabilitas data. Hasil penelitian menunjukkan bahwa model Random Forest memiliki kinerja yang sangat baik dengan nilai R-squared sebesar 0.946, yang mengindikasikan bahwa model ini mampu menjelaskan sekitar 94.6% dari variabilitas data produksi daging sapi. Prediksi menunjukkan bahwa Jawa Timur, Jawa Barat, dan Jawa Tengah akan tetap menjadi provinsi dengan produksi daging sapi tertinggi, sementara banyak provinsi di bagian timur Indonesia akan memiliki produksi yang relatif rendah. Temuan ini dapat digunakan untuk mendukung pengambilan keputusan strategis dalam upaya meningkatkan produksi daging sapi dan mengoptimalkan distribusi di seluruh Indonesia.

Sand casting is one of the metal casting methods that has been developed and is still being improved. Sand casting is a type of metal casting that use sand molds. There are several ways to make sand casting, However, this study use the jolt squeeze technique to create complex product forms such as the nozzle component of the air brake coupling. FCD 500 nodular cast iron alloy castings are used in the production of brake coupling nozzles. The goal of this research focuses on the metal casting technique for nozzle products for brake coupling, and then continue with the tensile testing procedure. Tensile testing utilizing JIS Z 2201 standards with two sampels with different diameters, specifically 12,46 mm and 12,79 mm, and material types FCD 500-1 and FCD 500-2. The research results show the sequence of the nozzle metal casting process for brake couplings, through the stages of designing, constructing models and cores, making molds, melting, pouring, fettling and finishing, and quality control. Tensile stress values of 525 N/mm2 and 546,189 N/mm2 were obtained for each FCD 500-1 and FCD 500-2 sampels, with force loads of 64000 N and 70130,66 N, respectively.

The Project of Depok Warehouse Building Construction is located at JL. Raya Jakarta-Bogor, KM. 35, Jatijajar, Depok City, West Java, 16415. The project of Depok Warehouse Building is built on a land area of 38,000 m2, with a building area of 24,000 m2. The Depok Warehouse Building has 8 floors, consisting of 5 floors for the building area and 3 mezzanine floors used for offices. PT. Depok Logistik Properti is the owner of the project, PT. Trimatra Jasa Prakarsa as the construction management, PT. Gistama Intisemesta as the planning consultant, and PT. Total Persada Indonesia as the main contractor. The type of contract used is a lump sum with a contract value of Rp 350,000,000,000. The planned duration of the Warehouse Building Construction project is 670 days. Research made on the field include upper structure works such as column, beam, floor slab, and ramp slab. The stages of the implementation method for the ramp Truck Plate Work start from preparation, marking, reinforcement fabrication, reinforcement installation, concrete decking installation, reinforcement checklist, formwork installation, verticality test, casting, formwork removal, and concrete curing.