Public health, climate, and economic impacts of desulfurizing jet fuel.

In jurisdictions including the US and the EU ground transportation and marine fuels have recently been required to contain lower concentrations of sulfur, which has resulted in reduced atmospheric SO(x) emissions. In contrast, the maximum sulfur content of aviation fuel has remained unchanged at 3000 ppm (although sulfur levels average 600 ppm in practice). We assess the costs and benefits of a potential ultra-low sulfur (15 ppm) jet fuel standard ("ULSJ").

Global mortality attributable to aircraft cruise emissions.

Aircraft emissions impact human health though degradation of air quality. The majority of previous analyses of air quality impacts from aviation have considered only landing and takeoff emissions. We show that aircraft cruise emissions impact human health over a hemispheric scale and provide the first estimate of premature mortalities attributable to aircraft emissions globally.

NO and NO2 emission ratios measured from in-use commercial aircraft during taxi and takeoff.

In August 2001, the Aerodyne Mobile Laboratory simultaneously measured NO, NO2, and CO2 within 350 m of a taxiway and 550 m of a runway at John F. Kennedy Airport. The meteorological conditions were such that taxi and takeoff plumes from individual aircraft were clearly resolved against background levels.

Planar Rayleigh scattering results in helium-air mixing experiments in a Mach-6 wind tunnel.

Planar Rayleigh scattering measurements with an argon-fluoride excimer laser are performed to investigate helium mixing into air at supersonic speeds. The capability of the Rayleigh scattering technique for flow visualization of a turbulent environment is demonstrated in a large-scale, Mach-6 facility. The detection limit obtained with the present setup indicates that planar, quantitative measurements of density can be made over a large cross-sectional area (5 cm x 10 cm) of the flow field in the absence of clusters.

[Diagnosis of urinary tract infections in puerperium].

In 225 puerperant urine proofs were taken both by suprapubic puncture and by mid stream technique. The corresponding proofs were examined culturally and microscopically. 42% of the mid stream proofs containing more than 10(5) germs/ml were evaluated to be false-positive.

[Bacteriuria screening in gynecologic practice: what is the value of mid-stream urine?].

In 55 healthy women corresponding urine proofs were taken by suprapubic punction and by mid stream technique from the same content of the urinary bladder. For detection or exclusion of bacteriuria both collection-methods are of equal value. In 96% of the cases the microbiological results were corresponding.

[Mid-stream versus bladder puncture urine in the diagnosis of urinary tract infection in pregnant patients].

150 healthy women being pregnant in the 1st, 2nd and 3rd trimester were examined. From the same content of urinary bladder suprapubic puncture urine (BPU) and mid-stream urine (MSU) were collected. The results concerning microbiological and microscopical analysis of urine proofs were compared.