منابع مشابه
The NOMACand Rake Systems
• In the 1950s, Lincoln Laboratory developed the spread-spectrum Noise Modulation and Correlation (NOMAC) system for improved high-frequency radio communications. The production version of NOMAC, named the F9C, generated a pseudonoise (PN) sequence at the receiving terminal in synchronism with the PN modulation of the transmitted signal. The F9C achieved as much as 17 dB of jamming protection. ...
متن کاملMemorial of Joseph Murray
It has not been too long since we realized that Joseph Murray (1919-2012) has passed away while we heard this sad news 2 weeks ago. We never forget his memories and trip for the first time on 14th November 1974to Iran. He returned to our country one more time later to share his experiences with the country specialists. It is a great sorrow that he did not see our progress in plastic and reconst...
متن کاملThe Lewis Memorial
world ; and it was by the outcome of his work that, if we mistake not, he himself would have wished to be represented to those whom he left behind him?the workers and thinkers of the present and future generations. We have received the handsome volume containing his physiological and pathological researches as he himself wrote and published them. The collection forms a handsome quarto volume of...
متن کاملThe Stribeck memorial lecture
Stribeck’s publications ‘Kugellager für beliebige Belastungen’ and ‘Die wesentlichen Eigenschaften der Gleitund Rollenlager’ were remarkable for their time. Many of the findings were revolutionary and are still considered quite modern. The method used by Stribeck to calculate load distribution between the balls within a ball bearing is still used today, otherwise, a full finite element analysis...
متن کاملThe Mayo Memorial Hospital
become disorganized, were removed. The flap was secured by hare-lip pins and silver stitches. Union by the first intention took place. About a month after the operation, a swelling was perceived at the frontal sinus and bridge of the nose extending towards the roof of both orbits ; it rapidly increased, and it was evident that the tumour had recurred. An incision was therefore made above and al...
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ژورنال
عنوان ژورنال: The Lancet
سال: 1896
ISSN: 0140-6736
DOI: 10.1016/s0140-6736(01)93976-5