The availability of public transport is one of the solutions to traffic congestion in Jakarta. Focusing on angkot, one of the public transport types in Jakarta, this study discusses a model and simulations to investigate several factors that affect its lateral stability. Those factors include rear tire inflation pressure, passenger configuration, velocity, and downhill inclination angle. The results show that the stability of an angkot is proportional to the rear tires cornering stiffness. It also has an indirect relationship with the passenger configuration within the angkot. Moreover, the stability of an angkot decreases as its velocity and the angle of the inclined road increase. In general, this study is expected to have a contribution to the development of public transport in Jakarta, especially angkot.

The purpose of this study was to find out science learning materials for students with special needs regarding the concept of exhaust emissions in transportation equipment. The research method used experimental demonstration. We prepared research instruments for learning the concept of exhaust emissions in transportation equipment for students with special needs. The results showed that several tools and materials must be provided and several lists of research instrument questions were made. In addition to tools and materials, methods and media must also be adapted to the needs of the child. That’s because the methods and media that are in accordance with the needs of students can make it easier for students to understand the learning material. We hope that the results of this study can make it easier for teachers to teach the concept of exhaust gas emission on transportation equipment, especially for students with special needs.

In Indonesia, it is a common practice for people in the urban area to bring children when riding a motorcycle. This habit raises a safety issue for the children as well as the motorcycle rider. For this reason, an additional child seat that allows the child to sit safely is demanded. This study aims to produce an innovative design of an additional child seat for a motorcycle that is portable, safe, durable, easy to use, and comfortable. The seat is designed so that it can be installed at the front and back sides of the rider in the motorcycle. The proposed model is designed to have a mass of between 0.6 to 3 kilograms. It is equipped with a seatbelt and head-protection pad. To evaluate the structural strength, theoretical analyses of solid mechanics were performed under static and fatigue loading conditions. As a result, the static safety factor of the child seat design for the front position was found to be 3.67. On the other hand, the fatigue safety factor of the child seat design for the front position was found to be 2.26, which is considered an infinite life. For the back position, the fatigue safety factor was found to be 2.36. The proposed design is expected to give a contribution to the development of innovative devices in transportation technology.

An electric vehicle battery pack which is a gathering of battery modules which subsequently comprised of the battery cell is a primary source of control transmission for an Electric Vehicle (EV). The inappropriate design of the battery enclosure will cause many genuine issues, such as cracking, causing noise, or battery harm. At the same time, the weight of the battery enclosure is huge; in order to get better the driving range of the electric vehicle and diminish the influence of the battery on the vehicle dynamic performance and acceleration performance, it is essential to carry out the lightweight design of the battery enclosure. This paper reviews the multi-material battery enclosure design optimization, the multi- technologies, and a proficient Battery Management System (BMS) for compact battery pack design used to lightweight battery pack enclosure design; the multi-objective optimization approach for distinctive parameters of battery pack enclosure design optimization by diverse manufacturing techniques.

Today, the application of NiFe2O4 nanoparticles is increasing in the field of technology that is in great demand, thereby increasing the demand for industrial production. The use of NiFe2O4 nanoparticles can be applied in various technologies, including aqueous batteries. Therefore, an effective method for industrial production is needed. This paper aims to discuss and compare a more efficient method in the synthesis of NiFe2O4. The research method used is a literature review of 62 papers. There are several NiFe2O4 synthesis methods, namely Coprecipitation, Citrate Precursor Technique, Mechanical Alloying, Hydrothermal, Sonochemistry, Reverse Micelle, Sol-Gel, and Pulsed Wire Discharge. The results show that the effective synthesis method of NiFe2O4 is Hydrothermal. This is because the hydrothermal method is economically feasible, environmentally friendly, and has no requirement of high temperatures in the calcination process to produce the final product. The nanoparticle size is around 29.39 nm. This paper is expected to assist in selecting the synthesis method of NiFe2O4.