Ground borne vibration in buildings due to railway traffic is a major concern in densely built up areas. In practice, railway induced vibration is often predicted by means of empirical methods such as the Detailed Vibration Assessment developed by the U.S. Federal Railroad Administration (FRA). The vibration velocity level in the free field is predicted based on a separate characterization of t...

The curfew planning problem is to design an annual timetable for railway track maintenance teams. Each team is capable of handling certain types of repairs and replacement jobs. The jobs are combined into a set of projects according to their locations and types. The timetable shows which project should be worked on by each team on a weekly basis throughout an entire year. Our objective is to de...

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...

Sister chromatid cohesion, mediated by cohesin and regulated by Sororin, is essential for chromosome segregation. In mammalian cells, cohesion establishment and Sororin recruitment to chromatin-bound cohesin depends on the acetyltransferases Esco1 and Esco2. Mutations in Esco2 cause Roberts syndrome, a developmental disease in which mitotic chromosomes have a 'railroad' track morphology. Here, ...

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 ...

car body acceleration is an important factor affecting track safety and ride comfort, which are two primary aspects of railway systems. though track level is an important source of wagon body acceleration, no quantitative relation between them is available and the aim of this paper is to propose a method to address this issue. to do so, car body acceleration is determined using a 10 dof simulat...

Dermatophilosis is a bacterial skin infection and wet conditions like, raining and dipping predispose sheep to it. A great economic loss can be caused by this disease because of its effect on the quality of wool. In Iran (near Saveh), there was an outbreak of the disease in a herd and the clinical manifestation was different from that of typical dermatophilosis. Diffuse wide alopecic area accom...

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...

The Union Pacific Railroad (UPRR) has over 3 1,000 miles of track covering a 24 state region. Planning and scheduling the production, packaging, delivery, and pickup of rail, involved in the maintenance of this network, is a very complex task. Manually scheduling only a subset of the resources required has historically taken several days to accomplish. Moreover, the inability to fully schedule ...