DIRECTIONAL PATCH ANTENNA ARRAY DESIGN FOR DESKTOP WIRELESS INTERNET by Noah Snyder Senior Project ELECTRICAL ENGINEERING DEPARTMENT California Polytechnic State University San Luis Obispo 2010 2 Table of Contents List of Figures ................................................................................................................................................ 3 List of Tables .............................................................................................
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particles‚ in the form of radiation‚ until a stable nucleus is produced; this is called the radioactive decay. Four isotopes as well as their uses are mentioned subsequently. Americium: Americium is a silvery metal‚ which corrodes slowly in air and is soluble in acid. It has the isotopes: Am-243‚ Am-242 and Am-241‚ with a half-life of 432 years‚ which was the first isotope to be isolated. The isotope Am-241 decays by emitting alpha particles and intense gamma radiation to become neptunium-237
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The current flows through the circuit since the temperature of the two junctions are different. IR Sensor -This device emits and/or detects infrared radiation to sense a particular phase in the environment. Generally‚ thermal radiation is emitted by all the objects in the infrared spectrum. The infrared sensordetects this type of radiation which is not visible to human eye. Touch
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wrong type of cell for that area of the body. This is what we call a tumor. If this tumor begins to spread to other areas of the body it’s diagnosed as cancerous. Many studies have been performed to try to prove that cell phone electromagnetic radiation‚ in the form of radiofrequency‚ can indeed damage DNA. In the document “Cell Phones and Cancer Risk‚” from the National Cancer Institute‚ it states that: “The results of these studies have generally not provided clear evidence of a relationship
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have to use a catheter for a week up to 10 days after the operation. 3. Radiation Therapy In lieu of surgery‚ radiation therapy may be used as the primary treatment for prostate cancer. This method uses high energy rays to kill cancer cells. There are 2 types of radiation therapy. The first‚ external beam radiotherapy‚ delivers radiation to the prostate from outside the body. The second‚ prostate brachytherapy or internal radiation therapy‚ is done by placing grain-sized radioactive materials in the
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25 Aaron James Uy Timosa BSIT – 4 INTRODUCTION The Therac-25 was a radiation therapy machine produced by Atomic Energy of Canada Limited (AECL) after the Therac-6 and Therac-20 units (the earlier units had been produced in partnership with CGR of France). It was involved in at least six accidents between 1985 and 1987‚ in which patients were given massive overdoses of radiation‚ approximately 100 times the intended dose. These accidents highlighted the dangers of software control of
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History and Modern Applications of X-Rays We see X-Rays all the time in television‚ science fiction novels‚ and comic book superheroes‚ but what is fact and what is fiction? By examining their makeup‚ history‚ modern applications‚ dangers‚ protection‚ and even possible future developments we can understand these scientific marvels far better and more accurately than watching an episode of Star Trek or reading a Superman comic. First and most important is to analyze why an X-ray works and what
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ASSIGNMENT COVER Course code: Course name: Assignment title: Research Paper - HAARP Instructor’s name: Student’s name: Date: Comments: Grade: /100 For some decades the man gives the impression of children playing with forces that are unable to comprehend and control. But behind every great discovery often pose risks‚ even threaten life itself on our planet. The fission of the atom‚ considered as the greatest discovery of 20th century‚ released
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matter cannot be explained on the assumption that the particles obey the laws of classical mechanics. At the end of 19th century and in the beginning of 20th century‚ many new phenomena such as photoelectric effect‚ x-rays‚ line spectra‚ nuclear radiation were discovered which wanted explanation on the basis of classical physics. Laws of classical mechanics failed to explain the above said newly observed properties of matter. Therefore the need of new concepts was felt in many areas of physical
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measure the amount of radiation evolved and graphical interpretations did allow calculation of the half-life. Experimental: The counter was measured in the background Beta-radiation count for five minutes. The readings were recorded in the prepared table. The activity of the standard Beta-emitter was recorded and measured for five minutes. The activity of the unknown Beta-emitter was recorded and measured for five minutes. The activity of the standard for the background radiation. Subtracted the
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