Breakthrough times of a commercially-available respirator cartridge packed with a small amount of activated carbon were determined by three different flow patterns: workers' respiratory patterns, conventional steady-state flows, and three standard patterns consisting of rectangle, sine, and triangle waves. A mechanical breathing simulator was used to reproduce the three standard wave patterns a...

A continuous fixed bed study was carried out by using PAN-oxime-nano Fe2O3 as a sorbent for the removal of nitrate from aqueous solution. The effect of factors, such as flow rate (2, 5 and 7 mL/min) and bed depth (5, 10 and 15 cm) were studied. Data confirmed that the breakthrough curves were dependent on flow rate and bed depth. The adsoption capacities observed in diffent conditions of flow r...

The St. Antonius Hospital Utrecht/Nieuwegein, the Netherlands, and Philips have announced an important breakthrough in the image-guided treatment of vascular patients. Using an innovative X-ray technology developed by Philips, the hospital’s interventional radiologists were able to dramatically reduce the amount of Xray radiation that patients are exposed to during image-guided endovascular pro...

It is widely perceived that unstable angina is a critical phase of coronary heart disease. The risk of acute myocardial infarction or death in these patients is high: up to 5% during hospitalization, 20% within 30 days, and 25% in 6 months. Medical and invasive treatment options for these patients have been rather discouraging, with two reasons responsible for this unsatisfactory state: first, ...

Few analytical techniques are better known to students of applied mathematics than conformal mapping. It is the classical method for solving problems in continuum mechanics, electrostatics, and other fields involving the two-dimensional Laplace and Poisson equations. To employ the method, one needs an explicit mapping function from some standard domain— such as the unit disk or upper half plane...

Fertilizer plant waste carbon slurry has been investigated after some processing as an adsorbent for the removal of dyes and phenols using columns. The results show that the carbonaceous adsorbent prepared from carbon slurry being porous and having appreciable surface area (380 m2/g) can remove dyes both cationic (meldola blue, methylene blue, chrysoidine G, crystal violet) as well a...

W ell, there wasn't much doubt about this year's winner. Unlike some past Breakthroughs, this one unfolded very much in the public eye, and the arguments that sometimes ensue when Science's News and Editorial staffs converge for the selection were pretty tame this time around. The two Mars rover missions—well advertised by NASA beforehand— succeeded where two other recent attempts had failed, a...

cines and the template described in An-derson and Hanson [2]. Blower falsely claims (e.g., see [3], p. 118) that her 1993 and 1994 articles included , to quote, " the first transmission model of HIV vaccines to assess the potential epidemic-level impact of imperfect vaccines. " This is incorrect—the 1991 Nature article by Anderson et al. was the first. To the Editor—Zygomycosis is an inva-sive ...