abstract introduction: identifying factors which cause the high incidence of acl is of great importance .the anterior shear forces are the primary mechanism of load sustained on the acl. during exercise, the activity of muscles and position of lower limbs may increase or decrease the anterior shear force. the purpose of this study is to investigate the relationship between the activity level of...

Guidance and control of aircraft in the landing phase imposes extra pilot work loads, hence application of automatic landing control systems is of great importance. In this study automatic landing control systems are introduced and an optimal landing control system is designed. The control system performance criteria are based on minimum control effort. The designed system is simulated for a tr...

manned lunar landing problem. Landing hazards exist everywhere on the Moon, and many of the more desirable landing sites are near the most hazardous terrain, so HDA is needed to autonomously and safely land payloads over much of the lunar surface. The HDA requirements used in the ALHAT project are to detect hazards that are 0.3 m tall or higher and slopes that are 5° or greater. Steep slopes, r...

Abstract The geomorphological and geological analysis of the surface three primary ten secondary landing ellipses (15 × 30 km) for Russian Luna-Glob automated scientific station ( Luna-25 ) is presented. earlier selected are found in sector 65°–85° S 0°–60° E lunar southern hemisphere. characteristics ellipse include age identification material sources. analyses water equivalent hydrogen concen...

Abstract Studying the geology of a terrestrial body and its evolution requires being able to set up chronology. Crater statistics is powerful tool do so. However, calibration this method, which derived on Moon, properly defined geological units, large enough for reliable crater statistics, dated samples representative these units. Yet, little effort has been put into choosing lunar mission unit...