Chapter 1 * What is Chemistry? -it is the study of the composition of substances and the changes they undergo. * What are the 5 branches of chemistry? * Organic chemistry‚ inorganic chemistry‚ analytical chemistry‚ physical chemistry‚ biochemistry. * What is the difference between a theory and law? -a theory is a thoroughly tested explanation of why experiments give certain results. A scientific law is a concise statement that summarized the results of a broad spectrum of observations
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|Btec National Unit 8 – Communications Technologies |Hand-in date |Return date | |Assessment No: 8.1 | | | |Assessment Title: The theory of data communications
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redistribute it in modified or unmodified forms. Meaning of Hardware -A computer’s hardware consists of the physical components necessary tooperate and interact with a computer. Since a computer’s primary language is binary‚devices are necessary to convert our input into that language. The binary code comingout of the computer must also be translated into something usable for the operator. Meaning of Software Software is often divided into two categories: 1.System software: Includes the operating system
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Nucleus Organelles Genetic material Reproduction Reproduction and Adaptation Prokaryotes reproduce quickly by binary fission and can divide every 1–3 hours Many prokaryotes form metabolically inactive endospores‚ which can remain viable in harsh conditions for centuries Prokaryotes can evolve rapidly because of their short generation times Reproduction in Prokaryotes? Fig. 12.12 Binary fission Reproduction without sex 3 processes that produce recombinant DNA in prokaryotes Prokaryotes have
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Baron Wilhelm von Leibniz builds a machine that can multiply and divide. In 1800s Charles Babbage created a n analytical engine that not only perform calculation but also print the output. George Boole then developed binary theory of logic which explain relationship between binary arithmetic and Boolean logic. First Generation Computers # Powered by thousands of vacuum tubes. The vacuum tubes themselves were large (the size of today’s light bulbs). They required great amounts of energy‚ and
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also components called DAC which means a digital to analog converter along with a ADC‚ which stands for analog to digital converter. These devices are needed to ensure the right signal and clear as well. The main thing digital signal uses are the binary code which is
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Introduction & MIPS http://handoutsuite.googlepages.com 0. Things you’ll be learning – – a basic foundation about how computers work how to analyze their performance 1. What is Computer Organization? • Coordination of many levels of abstraction • Under a rapidly changing set of forces • Design‚ Measurement‚ and Evaluation Why learn this stuff? – – – to learn the inner parts and working of a computer you want to build better software you need to make a purchasing decision or offer “expert”
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representation to "8-bit ASCII" before transmission‚ and (again‚ if necessary) to the receiving host’s character representation. As a consequence‚ this mode is inappropriate for files that contain data other than plain text. • Image mode (commonly called Binary mode): the sending machine sends each file byte for byte‚ and the recipient stores the bytestream as it receives it. (Image mode support has been recommended for all implementations of FTP). • EBCDIC mode: use for plain text between hosts using the
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Rules for Naming and Writing Compounds I. Ionic Bonds • bonding between a metal and non-metal or the bond between a positive ion and a negative ion forming a binary compound. • end in the suffix "ide" • Or bonding between a metal and a complex ion. Steps in writing formulas: • • • • Use a periodic table of elements and of ions. Write the symbol and charge of the cation first (positive ion) Write the symbol and charge of the anion next (negative ion) Use criss-cross rule to balance for an electrically
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1.Compute the weakest precondition for each of the following assignment statements and postconditions: (p. 165 Problem set 19‚ 20) (a)a = 2 * (b - 1) – 1 {a > 0} (b)a = a + 2 * b – 1 { a > 1} (c)a = 2 * b + 1; b = a – 3 {b < 0} (d)a = 3 * ( 2 * b + a); b = 2 * a – 1 {b > 5} (a) 2* (b-1) - 1 > 0 2* (b - 1) > 1 2b - 2 > 1 2b > 3 {b > 1.5} (b)a+2*b-1 > 1 a+2*b>2 {a > 2-2*b} (c)a-3 < 0 a3 2*b+a>1 {2*b>1-a} 2.Write a denotational semantics
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