We examine the constraints on sub-GeV dark sector particles set by proto-neutron star cooling associated with core-collapse supernova event SN1987a. Considering explicitly a photon portal model, we compute relevant interaction rates of (${A}^{\ensuremath{'}}$) and fermion ($\ensuremath{\chi}$) Standard Model as well their self-interaction inside sector. find that even small fine structure const...

Estimating tibiofemoral joint contact forces is important for understanding the initiation and progression of knee osteoarthritis. However, tibiofemoral contact force predictions are influenced by many factors including muscle forces and anatomical representations of the knee joint. This study aimed to investigate the influence of subject-specific geometry and knee joint kinematics on the predi...

Humans employ a high degree of redundancy in joint actuation, with different combinations of muscle and tendon action providing the same net joint torque. Both the resolution of these redundancies and the energetics of such systems depend on the dynamic properties of muscles and tendons, particularly their force-length relations. Current walking models that use stock parameters when simulating ...

background: availability of antiretroviral therapies has transformed aids into a manageable chronic condition and im­proved well-being among people living with hiv/aids (pha) in developed countries. in developing countries however, such transformations are yet to occur due to socio-economic, systemic and environmental constraint. this study examined the impact of social, economic, psychological...

this study investigates correlation between journal self – citation and impact factor in agriculture and veterinary subject category through the scientific journals indexed in isc's pjcr during 2001 to 2007. citation analysis is used to conduct the research. the results indicate a significant correlation between impact factor and journal self – citation (r=0.425, sig= 0.000); that is, journals ...

INTRODUCTION The minimal bony constraint of the glenohumeral joint (GHJ) enables it to achieve a remarkable range of motion. Consequently, the stability of the joint must be maintained by the surrounding soft tissue structures; in particular the rotator cuff. The data available on normal shoulder function is sparse due to complex kinematics of the GHJ and technical difficulties in acquiring the...

Time-optimal trajectories with bounded velocities and accelerations are known to be parabolic, i.e., piecewise constant in acceleration. An important characteristic of this class of trajectories is the distribution of the switch points, i.e., the time instants when the acceleration of any robot joint changes. When integrating parabolic trajectory generation into a motion planning pipeline, espe...