Diffusive-ballistic heat conduction of finite-length single-walled carbon nanotubes has been studied by means of non-equilibrium molecular dynamics simulations. The length-dependence of thermal conductivity is quantified for a range of nanotube-lengths up to a micrometer at room temperature. A gradual transition from nearly pure ballistic to diffusive-ballistic heat conduction was identified fr...

A battle management system for comprehensive ballistic missile defense must perform with near perfection and extraordinarily reliability. It will be complex to an unprecedented degree, untestable in a realistic environment, and provide minimal time for human intervention. The feasibility of designing and developing such a system (requiring upwards of ten million lines of code) is examined in li...

The terrorist attacks of September 11, 2001 illustrated in graphic terms the vulnerability of the United States to asymmetrical attack. The relative ease with which the nineteen Al Qaeda terrorists hijacked four airplanes and used them as deadly ballistic missiles was inconceivable to the citizens of the world’s only remaining superpower. In an instant, it became painfully clear that despite it...

Investigations of diffusive-ballistic heat conduction of finite-length single-walled carbon nanotubes and nanographene ribbons at room temperature have been carried out by using nonequilibrium molecular dynamics simulations. The length dependences of thermal conductivity reveal the variation of the balance between ballistic and diffusive heat conduction. For both systems, the profile indicates ...

Gregory Koblentz is a Junior Fellow with the Nuclear Non-Proliferation Project at the Carnegie Endowment for International Peace in Washington, D.C. The missile competition in South Asia is on the verge of a new and dangerous phase that threatens to disrupt the delicate strategic balance of the subcontinent. India and Pakistan already have stockpiles of ballistic missiles, along with the associ...

The attractiveness of both ballistic missiles and weapons of mass destruction (WMD) to various actors throughout the world represents a serious threat to U.S. security. These weapons and delivery systems are popular in part because they are highly visible symbols of military prowess. As such, they provide significant influence on regional balances of power, even among friends and allies. Furthe...

Three applications of ballistic electron microscopy are used to study, with nanometer-scale resolution, the magnetic and electronic properties of magnetic multilayer thin films and tunnel junctions. First, the capabilities of ballistic electron magnetic microscopy are demonstrated through an investigation of the switching behavior of continuous Ni80Fe20 /Cu/Co trilayer films in the presence of ...