Flying animals must successfully contend with obstacles in their natural environments. Inspired by the robust manoeuvring abilities of flying animals, unmanned aerial systems are being developed and tested to improve flight control through cluttered environments. We previously examined steering strategies that pigeons adopt to fly through an array of vertical obstacles (VOs). Modelling VO fligh...

Deformable polydimethylsiloxane (PDMS) microfluidic devices embedded with three differently-shaped obstacles (hexagon, square, and triangle) were used to examine the significant challenge to classical fluid dynamics. The significant factors in determining a quasi-steady state value of flow velocity (v)QS and pressure drop per unit length (∆P/∆x)QS were dependent on the characteristic of embedde...

annually, 4.7% of people aged 15-64 (184 million people) consume illegal drugs globally which is associated with numerous social and individual harms. according to expanded physical, psychological and social complications of addiction, treatment methods must include a combination of medical, psychological and social care. in terms of oral health, addiction aggravates direct or indirect oral pro...

evaluation of urmia medical university faculty member views about research obstacles r salem safy ,ma bn ashraf rezaei ,?bsc r sadatian , msc z moshirie , msc n sheikhy , a baniadam , msc received: 7april, 2009 accepted: 27 july, 2009 abstract background & aims: identifying research obstacles, assessment of faculty members’ ability in research skills and faculty members’ satisfaction of researc...

The report explores knowledge and practice in relation to pain recognition and management amongst direct support staff, members of community learning disability teams and general practitioners. It also examines the understanding and experiences of pain amongst people with a learning difficulty and dementia. It identifies the dilemmas and obstacles to effective pain management, and reports on ex...

It is proved that one can choose a control function on an arbitrarilly small open subset of the boundary of an obstacle so that the total radiation from this obstacle for a fixed direction of the incident plane wave and for a fixed wave number will be as small as one wishes. The obstacle is called “invisible” in this case.