Qatar Doha Qatar

1 Introduction Radiographic examination plays a crucial role in establishing accurate diagnosis of dental conditions, formulating comprehensive treatment plans, and monitoring treatment outcomes (Essam et al. 2025). The main radiographic modalities commonly used in dental settings include periapical radiographs (PARs), panoramic radiographs, and cone-beam computed tomography (CBCT) scans (Patel et al. 2019).

6.2.1.2 Cylindrical Parabolic Solar Concentrators Figure 19 illustrates a cylindrical parabolic trough solar concentrator, which comprises a reflector shaped like a cylindrical parabola and a metal tube receiver located along its focal plane. The concentrator encased the receiver and rotated it along a single axis to follow the sun's movement. As the heat transfer fluid flowed through the absorber tube, it was heated. Absorber tubes can be made of materials such as mild steel or copper.

1 Introduction In practical applications, numerous industrial processes demonstrate inherent spatial distribution, wherein their behaviors rely on both spatial position and time. These systems are called distributed parameter systems. Examples of such processes encompass fluid flows, transport-reaction phenomena, and, notably, chemical tubular reactors [1-3].