4.1 Addition of hx to Alkenes. p100 Hydrohalogenation General reaction mechanism: electrophilic addition Attack of electrophile(such as hBr)on T bond of alkene Produces carbocation and bromide ion Carbocation is an electrophile, reacting with nucleophilic bromide ion

Cyclic Codes a cyclic code is a linear block code where if c is a codeword, so are all cyclic shifts of c E.g., 1000, 110, 101,011 is a cyclic code Cyclic codes can be dealt with in the very same way as all other lbc s Generator and parity check matrix can be found a cyclic code can be completely described by a generator string G All codewords are multiples of the generator string In practice, cyclic codes are often used for error detection(CRc) Used for packet networks When an error is detected by the received, it requests retransmission

Modulation Representing digital signals as analog waveforms Baseband signals Signals whose frequency components are concentrated around zero Passband signals Signals whose frequency components are centered at some frequency fc away from zero Baseband signals can be converted to passband signals through modulation Multiplication by a sinusoid with frequency fc Eytan Modiano

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Teaching plan for Unit 3 I Aims Demands Get the students (1)to comprehend the text of Section A 2)to have a good grasp of the following points: ups and downs be /get involved with; hold work out: go through; for a time i met with all along; upon/on doing sth subsequently(consequently): harbor; see.as; at one's worst; why do/ not do sth; buy time; never too adj. to do sth

Unit 3 Tourism 1 The Great Wall, the symbol 2 The Palace Museum(故宫), the ForbiddenCity(紫禁城), wooden-structure-(木结构), building complex(建筑群), be enthroned(登基) 3 The Peking Man, skull(头颅), be unearthed(出土 4 terra-cotta- warriors and horses(兵马俑),The first Chin Emperors' Mausoleum(始皇陵),be dubbed as(被戏称为),the8 th wonder(第8大奇迹)

One-Dimensional Arrays Using const in Function Prototypes Using an Array of struct or class Objects Using an enum Index Type for an Array Special Kinds of Array Processing Two-Dimensional Arrays Passing Two-Dimensional Arrays as Arguments

Sorting: There is a series of data in random order, we sort them depending a certain key word Datalist: an finity set of data waiting to be sorted Key: data object has many attribute areas, namely there are many data element, one of all these elements can be used to distinguish object, we use it as sorting key. we also call it sorting code

The C Programming Language Chapter Functions Chapter 8 Functions Overview Function Definition The Return Statement Arguments---Call By value Function Invocation Nested invocation and Recursion Arrays as parameters Storage classes of variables

The C Programming Language Chapter 5 Control Flow 5.1 Overview of c statements C statements: using a semicolon\ as a statement terminator Kinds of c statements