We study the sawtooth lattice of a coupled spin 1/2 Heisenberg system, a variant of the railroad trestle lattice. The ground state of this system is twofold degenerate with periodic boundary conditions and supports kink antikink excitations, which are distinct in this case, unlike the railroad trestle lattice. The resulting low temperature thermodynamics is compared with the recently discovered...

The benefit provisions and legislative history of the 1951 amendments to the Railroad Retirement Act were summarized in the February Bulletin. In this issue the Chief Actuary of the Social Security Administration discusses the financial and actuarial implications of the amended law, with special emphasis on the provisions coordinating in some measure the railroad program with old-age and surviv...

Railroad equipment manufacturers are surveying a railroad clearance and the environment along rail line to ensure that vehicles can travel safely. Currently, there is need for system accurately measure distance from center of track structures within railroad. Therefore, we have developed 2D-LiDAR create 2D drawings geometry in In this study, propose method detect errors data occur during measur...

Railroad-related accidents are more dangerous than other transportation accidents in terms of severity and death rate etc. Therefore more efforts are necessary for improving safety. In the mean time, Korean national railroad has researched and invested continuously such as intelligent safety equipments and level crossing between railroad and highway for decreasing railroad-related accident and ...

This paper considers a three-stage assembly flowshop scheduling problem with sequence-dependent setup < /div> times at the first stage and blocking times between each stage in such a way that the weighted mean completion time and makespan are minimized. Obtaining an optimal solution for this type of complex, large-sized problem in reasonable computational time using traditiona...

Railroads have been using wayside inspection technologies for many years to improve the safety and efficiency of operations. There has been a recent proliferation of new, more sophisticated, but also more costly inspection systems that are capable of detecting a wide range of subtle defects before a problem has actually occurred. This new class of “predictive” wayside detection systems, as comp...

ITE JOURNAL / NOVEMBER 1999 HIGHWAY-RAILROAD GRADE crossings are a relatively unique and sometimes perilous intersection of two transportation modes. The cost of collisions at these intersections is high in both dollars and human lives. The amount and type of sight distance provided at highway-railroad grade crossings can have significant impacts on safety. The proper calculation of these sight...

We extend π-calculus with real time (timed π-calculus) and give an operational semantics for it. We present the outline of an implementation based on co-induction, coroutining, and constraint logic programming over reals of this operational semantics. We show how timed π-calculus can be used for modeling and verifying real-time and cyberphysical systems. We illustrate our work by applying it to...

We study the sawtooth lattice of a coupled spin 1/2 Heisenberg system, a variant of the railroad-trestle lattice. The ground state of this system is twofold degenerate with periodic boundary conditions and supports kink-antikink excitations, which are distinct in this case, unlike the railroad-trestle lattice. The resulting lowtemperature thermodynamics is compared with the recently discovered ...