Amanda L. Stevens

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BACKGROUND Patients with sickle cell disease (SCD) have high rates of perioperative complications, including bleeding 1,2. PROCEDURES We conducted a retrospective review of pre-operative coagulation studies in pediatric patients with SCD followed by a prospective study of 100 well children with SCD to determine the prevalence of abnormal coagulation(More)
The paper details the specification of an ultrasonic Doppler flowmeter intended for perivascular application and describes the elements of the design of an ultrasonic blood flow transducer. An optimised design is outlined for probes to be used on vessels in the range 5–12 mm. The design is based on the use of continuous-wave Doppler techniques and(More)
STUDY OBJECTIVE To compare robotic-assisted laparoscopy with conventional laparoscopy for treatment of advanced stage endometriosis insofar as operative time, estimated blood loss, complication rate, and length of hospital stay. STUDY DESIGN Retrospective cohort study (Canadian Task Force classification II2). All procedures were performed by one surgeon(More)
Only 1% of the original extent of Florida’s seepage slope habitat remains, with Eglin Air Force Base containing some of the largest tracts. Feral swine damage is one of the greatest threats to this wetland habitat. We conducted a multi-year study to evaluate the impacts of sport hunting and supplemental swine removal on damage to seepage slopes. Prior to(More)
Diverging Diamond Interchanges (DDIs) are an emerging interchange configuration that eliminates the need for left-turn phases in conventional diamonds and may be less expensive to construct than some alternative geometries. This paper examines signal timing for DDIs. To date, DDI signal timing has typically used two-phase configuration reflecting the two(More)
• Originally described by Day and Bullock (2011), (DOI: 10.3141/2259-04) • Based on “Combination Method” developed in the 1960s • Start from one intersection and moves to other end of the system • Each intersection offset is optimized to achieve best performance for two directions on the next link • Previously optimized link flows are preserved by adding(More)
Signalized diamond interchanges are unique pairs of intersections characterized by interlocked left turns and relatively close spacing between ramps. A diamond interchange has four external entry points (origins) and four external exit points (destinations). To effectively operate a diamond interchange, it is critical to examine the external(More)
Serving protected left turn phases for one or two vehicles can often be an inefficient use of cycle green time when the opposing through movements are over capacity. This paper assesses the performance of an intersection based on the application of controller logic that delays the call for a protected left turn phase based on vehicle wait times. Four weeks(More)
Signalized diamond interchanges are pairs of ramp intersections characterized by interlocked left turns and relatively close spacing. This paper describes a series of performance measures derived from high-resolution signal controller event data that can be used to optimize the internal phase sequence and offset to improve traffic flows within diamond(More)
During oversaturation, a popular objective in traffic signal operations is to maximize throughput in order to keep traffic moving. As cycle lengths are increased, the proportion of " lost time " used to transition between signal phases is reduced. This is often a rationale for programming long cycle lengths into signal timing plans. To investigate the(More)