The effect of heat treatment and alloying elements of copper and tin on the microstructure and mechanical properties of austempered ductile cast iron alloys is investigated. The austenitizing temperature of 890°C, the isothermal transformation (austempering) temperatures of 285, 335 and 375°C, and austempering times of 15, 30, 75 and 150 minutes are studied. The alloying elements of copper and ...

Evolving content of the Web is being accumulated over time into Web archival collections. This creates the need for time travel search to explore the dynamics of the content. Text analytics has also a key role in exploring interesting information in text collections. Moreover, frequent phrase mining, a special case of text analytics, is an important analytical task that is motivated by the need...

Understanding the mixing between surface water and groundwater as well travel times in vulnerable aquifers is crucial to sustaining a safe supply. Age dating tracers used infer apparent typically refer entire sample. A sample, however, consists of mixture waters with distribution times. only reflect proportion that under range tracer, thus their interpretation biased. Additionally, end-member m...

While much has been reported about bus travel times and their variability for formal services, little is known time variation paratransit, the dominant means of transportation in most low- middle-income countries (LMICs). This study quantifies components paratransit on a selected route Kumasi, Ghana. It analyzes within day from to day. A mobile phone app was employed conduct survey onboard vehi...

Estimates of ambulance travel times on road networks are critical for effective ambulance base placement and real-time ambulance dispatching. We introduce new methods for estimating the distribution of travel times on each road segment in a city, using Global Positioning System (GPS) data recorded during ambulance trips. Our preferred method uses a Bayesian model of the ambulance trips and GPS ...

[1] Cylindrical anisotropy in Earth’s inner core has been invoked to account for travel times of PKP core‐sensitive seismic waves, such as from the South Sandwich Islands (SSI) earthquakes observed in Alaska, which depart from predictions. Newly collected travel‐time residuals from seismic waves from the SSI region that sample only Earth’s mantle (PcP and P waves) have a comparable range to the...

How to model traveler’s perception of travel time is always an important issue in the development of traffic assignment models. Since travelers rarely have perfect knowledge of the road network or of the traveling conditions, they choose routes based on their perceived travel times. Traditionally, travelers’ perceived travel times are treated as random variables, leading to the stochastic traff...