abstract background and aim: lack of balance in pattern and activity of quadriceps and hamstring muscles increases the risk of anterior cruciate ligament injury (acl). the purpose of the present study was to investigate the changes in pattern and activity of vastus medialis and semitendinosusmuscles in landing from different heights and to understand if these changes will increase the risk of a...

Considerable progress has been made over the last 15 years on building adaptive control systems to assist pilots in flying damaged aircraft. Once a pilot has regained control of a damaged aircraft, the next problem is to determine the best site for an emergency landing. In general, the decision depends on many factors including the actual control envelope of the aircraft, distance to the site, ...

Considerable progress has been made over the last 15 years on building adaptive control systems to assist pilots in flying damaged aircraft. Once a pilot has regained control of a damaged aircraft, the next problem is to determine the best site for an emergency landing. In general, the decision depends on many factors including the actual control envelope of the aircraft, distance to the site, ...

This paper describes a set of experiments involving small helicopters landing automated landing at unusual attitudes. By leveraging the increased agility of small air vehicles, we show that it is possible to automatically land a small helicopter on surfaces pitched at angles up to 60 degrees. Such maneuvers require considerable agility from the vehicle and its avionics system, and they pose sig...

objective(s): the effect of silica nanoparticles (snps) in sport shoes outsoles on the  parameters related to anterior cruciate ligament (acl) injury has not been investigated. the aim of this study was to investigate the effect of shoes outsole containing a composite of thermoplastic elastomer based on styrene-butadiene and silica nanoparticles (tpen shoe) on knee valgus angle (kva) as a risk ...

Experienced gymnasts are considered by many to be landing experts, because they are able to successfully land from heights of 3m or more (McNitt-Gray, 1993). Although gymnasts may be landing experts, their landing mechanics cannot be determined solely by optimal landing strategies because the judging system places constraints on how a landing is to be performed. Gymnasts spend many years perfec...

You've landed the perfect job, but now you must face your current employer and deliver the news that you're leaving the organization. While an exciting time, this can also certainly be a stressful one. Here are some strategies and ideas for saying goodbye to an employer that may be useful in guiding your actions. From being ready for counter-offers to downright hostility, you need to be prepare...

Autonomous landing is one of the must-have operations of unmanned aerial vehicles such as drones. In this paper we describe an approach for fully autonomous landing of AR.Drones. This approach consists of two components – identifying and recognizing a proper pattern used to mark the landing area and reaching the landing area (landing) even if small disturbances occur. We discuss possible patter...

Background: Mechanical occlusion of the Left atrial appendage (LAA) using a purpose-built device has emerged as an effective prophylactic treatment in patients with atrial fibrillation at risk of stroke and a contraindication for anticoagulation. A crucial step in procedural planning is the choice of the device size. This is currently based on the manual analysis of the “Device Landing Zone” fr...