200 CMAJ, February 17, 2015, 187(3) ©2015 8872147 Canada Inc. or its licensors During a rugby tournament, a 15-year-old girl was tackled and her head struck her op ponent’s knee. She was slow to get up, and appeared unsteady and dazed. After using the Pocket Concussion Recognition Tool1 to assess the player’s condition, her coach suspected that she had a concussion and removed her from the game...

FOR TOO LONG THE STUDY OF COMMUNISM AND COMmunist movements has preceded as sui generis, with no concern for its relation to broader academic areas of inquiry or for some of the more pertinent questions of the epoch. Scholars in Communist affairs have passed their colleagues working in other areas of academic inquiry like ships in a foggy sea, heading for similar destinations and using analogou...

We report on a feasibility study of a free-space Quantum Key Distribution setup operating at a mid-infrared wavelength. Alice sends polarization-coded pseudo-single photons from a Quantum Cascade Laser at 4.6 μm to Bob, who uses a nonlinear crystal and a Silicon Avalanche Photodiode to perform the detection via Sum Frequency Generation. Theoretical predictions, based on a proof-of-principle exp...

Extraction of lenses for cataract surgery is one of the most frequent outpatient surgical procedures; more than three million cases are performed annually in the United States. Phacoemulsification is the commonly used method for cataract extraction. Phacoemulsification systems (also known as phacoemulsifiers, cataract extraction units, or simply, phaco units) apply high-frequency oscillations t...

“He was indeed a deplorable spectacle. In the dim light of a foggy November day the sick room was a gloomy spot, but it was that gaunt, wasted face staring at me from the bed which sent a chill to my heart. His eyes had the brightness of fever, there was a hectic flush upon either cheek, and dark crusts clung to his lips; the thin hands upon the coverlet twitched incessantly, his voice was croa...

This paper presents an interesting contrast between foggy and hazy periods of various AMS variables indicating degree of OA oxidation or volatility. The results are likely to be of particular interest to the AMS community, but some of the findings are also of general interest to those investigating secondary organic aerosol formation. Although the data is interesting, in my view the author’s wa...

Radar overcomes the shortcomings of laser, stereovision, and sonar because it can operate successfully in dusty, foggy, blizzard-blinding, and poorly lit scenarios. This paper presents a novel method for ground and obstacle segmentation based on radar sensing. The algorithm operates directly in the sensor frame, without the need for a separate synchronised navigation source, calibration paramet...