South Leg Research Articles

Peningkatan Kinerja Simpang Ciceri, Kota Serang dengan Model Penerapan Ruang Henti Khusus

The Ciceri intersection is in a densely populated urban area characterized by heavy traffic, particularly motorbikes. This is due to the nearby educational institutions, shops, offices, and a shopping center. The intersection faces numerous traffic conflicts, including crowded vehicle queues, irregular queuing by motorbikes, and improper lane usage by two- and four-wheeled vehicles. The phase setting of traffic signaling devices (APILL) at the Ciceri intersection has been implemented but has not solved the problem. This research aims to analyze the use of RHK to improve the performance of the Ciceri intersection using the Vissim model. The method is to test or simulate various RHK models at the research location. The results obtained can be applied to the RHK at two intersection legs, namely east and west, with a box-type RHK measuring 8m long and 2 x 3.5m wide, increasing the level of Service (LOS) from E to F. The results show a reduction in queues of 5.64 m and delays of 1.52 seconds on the north leg, as well as a reduction in queues of 7.85 m and a delay of 13.48 seconds on the south leg. These results show that RHK can effectively improve the performance of intersections with high traffic volumes without the need to increase physical road capacity.

Two-dimensional multi-parameter fields of a limb flare loop system

The 2D H-beta spectral data of the post-flare loop system (PFLs) of August 17, 1989 are obtained and analyzed quantitatively. Four physical parameters (the line-of-sight velocity V-//, column number density of the hydrogen atoms at the second level along the line-of-sight direction N-2, the excitation temperature T-ex and the micro-turblence velocity V-t) and their 2D distributions are derived. The 2D fields of V-//, N-2, T-ex and V-t exhibit inhomogeneous and asymmetric properties in two loop legs. Red-shift velocities in the south leg are smaller than those of blue shift in the north leg where the velocity reaches 60 km s(-1). The values of N-2 and T-ex in the south leg are all much higher than those in the north leg, N-2 ranges between 0.5 to 4.5 x 10(13) cm(-2), while T-ex ranges from 0.8 to 2.2 x 10(4) K, lower at the top part than in the two legs. A high temperature region is located in the middle of the south leg. V-t at the top part is greater than that in the two legs, with the average being 30 similar to 40 km s(-1). Electron density n(e) and electron pressure P-e are estimated at 0.2 similar to 0.6 x 10(11) cm(-3) and at 0.04 similar to 0.12 dyn cm(-2), respectively. These results are compared with those obtained from the PFLs of 1984 February 18.