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"Summary: The second edition of Theories in Second Language Acquisition seeks to build on the strengths of the first edition by surveying the major theories currently used in second language acquisition research. This volume is an ideal introductory text for undergraduate and graduate students in SLA and language teaching. Each chapter focuses on a single theory, written by a leading scholar in the field in an easy-to-follow style - a basic foundational description of the theory, relevant data or research models used with this theory, common misunderstandings, and a sample study from the field to show the theory in practice. This text is designed to provide a consistent and coherent presentation for those new to the field who seek basic understanding of theories that underlie contemporary SLA research. Researchers will also find the book useful as a "quick guide" to theoretical work outside their respective domai"

"ABSTRACT

Data acquisition system using diode array for a spectrometer has been designed and constructed. The light detection is performed by a photodiode array consisting of 512 photodiodes. The superior quantum efficiency of the detector and the direct increase of optical flux with photodiode electrons make it works as a very fast detector. This detector is supplemented with a charge-coupled device working as a shift register for the array, and as a result each light spectrum can be scanned in less than one minute.

The detecting subsystem is followed by a 12 bit analog to digital conversion module which operates at the speed of 26 uses. This data acquisition system is also equipped with an Z BO CPU controlled interface module for its data transfer to an IBM PC, to allow further processing and analysis of the data as well as its final display. In addition to each individual subsystem testing, the whole integrated system has also been tested with a known spectrum and the result is satisfactory."