On railway sections where there are intersections with road transport, control systems for crossing signaling auto barriers arranged. To the entrance of train to this section, track circuits insulating joints used. Such have a number significant drawbacks, one which is coming off joints, as well breakage circuit, give 45% failures automation on haul. In article, study was made circuit tone freq...

nitrogen oxides and carbon monoxide gases together with dust are known as the major pollutants arising during the blasting operations using the ammonium nitrate-fuel oil (anfo) explosive at the sungun surface mine, located in the northwest of iran. the pollutants were monitored during some blasting operations at the mine. it was concluded that the gases and dust clouds initially went up to the ...

Abstract Winter roads play a vital role in linking communities and building economies the northern high latitudes. With these regions warming 2–3 times faster than global average, climate change threatens long-term viability of important seasonal transport routes. We examine how will impact world’s busiest heavy-haul winter road—the Tibbitt to Contwoyto Road (TCWR) Canada. The FLake freshwater ...

We monitored the haul-out behavior of 68 radio-tagged harbor seals (Pbucu vittllina) during the molt season at two Alaskan haul-out sites (Grand Island, August-September 1994; Nanvak Bay, August-September 2000). For each site, we created a statistical model of the proportion of seals hauled out as a function of date, time of day, tide, and weather covariates. Using these models, we identified t...

Recently both academic and industry worlds have started to define the successor of Long Term Evolution (LTE), so-called 5G networks, which will most likely appear by the end of the decade. It is widely accepted that those 5G networks will have to deal with significantly more challenging requirements in terms of provided bandwidth, latency and supported services. This will lead to not only modif...

Based on the higher order nonlinear Schrödinger equation, the amplification and the reshaping of ultrashort pulses are investigated. The numerical results show that the direct amplification of femtosecond pulses can be achieved by injecting a continuous wave (CW) and filtering the CW at suitable positions in the presence of higher-order dispersion and nonlinear effects. The combination of conti...

Harbor Seals (Phoca vitulina) are the most abundant and widespread seal species in Washington State. Most seal haul-out sites are unavailable at high tide, hence abundance estimates are conducted at low tide when it is commonly accepted that most seals are hauled-out. On sites unaffected by tides, however, it is less clear whether tide level has an effect on seal abundance. We counted hauled-ou...