The rail irregularities and wheel-rail interactions in a train running at high speeds may result large-amplitude vibrations the train’s car body affect passengers by reducing ride comfort. suspension systems have crucial role improving comfort to an acceptable level. In this context, exclusive magneto-rheological (MR) damper with favorable dynamic range was designed fabricated. MR dampers were ...

Stereological techniques using the optical disectors require estimation of final section thickness, but frozen tissue irregularities may interfere with this estimation. Cryostat slices from rodent nerve tissues (dorsal root ganglia, spinal cord, and brain), cut at 16, 40, and 50 μm, were digitized with a confocal microscope and visualized through 3D software. Geometric section thickness of tiss...

With dynamic behaviour different from that of traditional discretely supported tracks, continuously embedded rail systems (ERSs) have been increasingly used in railway bridges, level crossings, trams, and high-speed lines. However, studies on ERSs limited, none them addressed the wheel-rail impact-induced response, although impact is a main cause ERS degradation. This paper studies, numerically...

Virtually all fibers exhibit some dimensional and structural irregularities. These include the conventional textile fibers, the high-performance brittle fibers and even the newly developed nano-fibers. In recent years, we have systematically examined the effect of fiber dimensional irregularities on the mechanical behavior of the irregular fibers. This paper extends our research to include the ...

Ultrasonic Non Destructive (NDT) inspection frequency needs to be decided based on probability of rail breaks and derailments along with cost of inspection, planned maintenance and corrective maintenance. This paper is on development of probabilistic model for NDT inspections. Undetected defects can lead to rail breaks based on the ageing, and tonnage passed through the line after the defect is...

Extensive studies have been performed on random lasers in which multiple-scattering feedback is used to generate coherent emission. Q-switching and mode-locking are well-known routes for achieving high peak power output in conventional lasers. However, in random lasers, the ubiquitous random cavities that are formed by multiple scattering inhibit energy storage, making Q-switching impossible. I...

A Digital virtual Disk (DVD) random access memory (RAM) Redundant Array of Inexpensive Libraries (RAIL) optical storage system has been developed and tested at NTT Integrated Information & Energy Systems Laboratories. The RAIL storage system incorporates multiple DVD libraries that consist of dual DVD-RAM drives. Each DVD library utilizes a single mechanical robot picker for media loading and u...

Irregular buildings make up a large portion of  urban infrastructure. Presence of irregularities can be due to architectural and  user changes in building stories. Main objective of this article is evaluate seismic performance of structures with vertical irregularities. Seismic responses are obtained by enveloping peak inelastic responses resulting from pushover analyses according to provided p...

Railways employ a range of different railway track forms. Here, ballasted design is compared to three slab solutions. The designs are using both life cycle analysis (LCA) and methodology for simulation three-dimensional vertical dynamic vehicle–track interaction, which has been verified versus field measurements. interaction between vehicle simulated in the time domain an extended state-space v...