We show that the observed saturation of X-ray emission with increasing rotation rate in solar-type stars does not necessarily imply saturation of the underlying dynamo. This effect can be caused by the centrifugal stripping of the corona. As the stellar rotation rate is increased, centrifugal forces cause a rise in the pressure and density in the outer parts of the largest magnetic loops. This ...

High risk special operations often require that the team is trained in advance in an environment similar to the target area. It would be ideal if a replica could be built and the team could be trained in the operational environment. However, it is usually difficult to do so in a timely manner, especially when intelligence constantly changes. Traditionally, a scaled-down model of the target area...

A dark sector — a new non-Abelian gauge group Higgsed or confined near the GeV scale — can be spectacularly probed in low-energy e+e− collisions. A low-mass dark sector can explain the annual modulation signal reported by DAMA/LIBRA and the PAMELA, ATIC, and INTEGRAL observations by generating small mass splittings and new interactions for weak-scale dark matter. Some of these observations may ...

In the standard model of cosmology, dark matter and dark energy are presently the two main contributors to the total energy in the Universe. However, these two dark components are still of unknown nature, and many alternative explanations are possible. We consider here the so-called unifying dark fluid models, which replace dark energy and dark matter by a unique dark fluid with specific proper...

We consider the capability of the e+e− linear collider (which is recently called as the International Linear Collider, or ILC) for studying the properties of the heavy Higgs bosons in the supersymmetric standard model. We pay special attention to the large tan β region which is motivated, in particular, by explaining the dark-matter density of the universe (i.e., so-called “rapid-annihilation f...

This paper extends the capabilities of the harmonic potential field approach to planning to cover both the kinematic and dynamic aspects of a robot’s motion. The suggested approach converts the gradient guidance field from a harmonic potential to a control signal by augmenting it with a novel type of dampening forces suggested in this paper called: nonlinear, anisotropic, dampening forces (NADF...

Recently, we have derived the leading and subleading isospin–breaking three–nucleon forces using the method of unitary transformation. In the present work we extend this analysis and consider the corresponding two–nucleon forces using the same approach. Certain contributions to the isospin– violating one– and two–pion–exchange potential have already been discussed by various groups within the e...

Military activities in hot environments pose 2 competing demands: the requirement to perform realistic training to develop operational capability with the necessity to protect armed forces personnel against heat-related illness. To ascertain whether work duration limits for protection against heat-related illness restrict military activities, this study examined the heat strain and risks of hea...

For the first time, we have a plausible and complete accounting of matter and energy in the Universe. Expressed a fraction of the critical density it goes like this: neutrinos, between 0. to the critical density (within the errors). This accounting is consistent with the inflationary prediction of a flat Universe and defines three dark-matter problems: Where are the dark baryons? What is the no...

We show that dark matter could be made of massive gauge bosons whose stability doesn’t require to impose by hand any discrete or global symmetry. Stability of gauge bosons can be guaranteed by the custodial symmetry associated to the gauge symmetry and particle content of the model. The particle content we consider to this end is based on a hidden sector made of a vector multiplet associated to...