Publications by authors named "T E Durbin"

We assessed the real-world particulate emissions of a goods movement diesel vehicle, with an emphasis on total particle number and solid particle number emissions at different cutoff sizes. The vehicle was tested on routes in the South Coast Air Basin (SCAB) of California, representative of typical goods movement operation between the ports to warehouses and logistic centers with a mixture of urban and highway driving, as well as elevation change. We evaluated emissions during normal vehicle operation and diesel particulate filter (DPF) active regeneration events.

View Article and Find Full Text PDF
Article Synopsis
  • The study evaluated NOx and black carbon emissions from six heavy-duty diesel and CNG vehicles in California, using portable emissions measurement systems during typical operations.
  • CNG vehicles emitted significantly more black carbon (3-7 times higher) compared to diesel vehicles, but their NOx emissions were drastically lower, averaging 35 times less than diesel vehicles.
  • The findings indicate that real-time emissions measurements offer better insights for assessing population exposure in freight corridors, with over 70% of harmful emissions occurring in disadvantaged communities.
View Article and Find Full Text PDF

The authors have developed a paradigm using positron emission tomography (PET) with multiple radiopharmaceutical tracers that combines measurements of cerebral metabolic rate of glucose (CMRGlc), cerebral metabolic rate of oxygen (CMRO2), cerebral blood flow (CBF), and cerebral blood volume (CBV), culminating in estimates of brain aerobic glycolysis (AG). These in vivo estimates of oxidative and non-oxidative glucose metabolism are pertinent to the study of the human brain in health and disease. The latest positron emission tomography-computed tomography (PET-CT) scanners provide time-of-flight (TOF) imaging and critical improvements in spatial resolution and reduction of artifacts.

View Article and Find Full Text PDF

This work, for the first time, assessed the secondary aerosol formation from both in-use diesel and natural gas heavy-duty vehicles of different vocations when they were operated on a chassis dynamometer while the vehicles were exercised on different driving cycles. Testing was performed on natural gas vehicles equipped with three-way catalysts (TWCs) and diesel trucks equipped with diesel oxidation catalysts, diesel particulate filters, and selective catalytic reduction systems. Secondary aerosol was measured after introducing dilute exhaust into a 30 m environmental chamber.

View Article and Find Full Text PDF