• 可编程中断控制器8259A的功能 • 8259A的结构 • 8259A的控制字及编程使用

simple counters Counting is a fundamental function of digital circuits. A digital counter consists of a collection of flip-flops that change states (set or reset) in a prescribed sequence

Junction potentials Whenever we change electrolyte or solvent there is a cost in that we create a double layer (electrode)which has a small but often measureable potential We call this potential a junction potential

11.1 概述 11.2 D/A转换器 11.3 A/D转换器

Magnetic Induction The Divergence of B Magnetic Monopoles The Vector Potential A A and V Integral of A over a Closed Curve

Appendix B Useful identities Algebraic identities for vectors and dyadics A + B = B + A (B.1) A · B = B · A (B.2)

What is a topic sentence? What does a topic sentence consist of ? What is a supporting sentence? How to organize a paragraph? Conclusion Assignments

7.6 DMA控制器8237 7.7 D/A和A/D转换技术

1 Neglect: A Disorder of Spatial Attention 1 Anjan Chatterjee 2 Bálint’s Syndrome: A Disorder of Visual Cognition 27 Robert Rafal 3 Amnesia: A Disorder of Episodic Memory 41 Michael S. Mega 4 Semantic Dementia: A Disorder of Semantic Memory 67 John R. Hodges 5 Topographical Disorientation: A Disorder of Way-Finding Ability 89 Geoffrey K. Aguirre 6 Acquired Dyslexia: A Disorder of Reading 109 H. Branch Coslett 7 Acalculia: A Disorder of Numerical Cognition 129 Darren R. Gitelman 8 Transcortical Motor Aphasia: A Disorder of Language Production 165 Michael P. Alexander 9 Wernicke Aphasia: A Disorder of Central Language Processing 175 Jeffrey R. Binder 10 Apraxia: A Disorder of Motor Control 239 Scott Grafton 11 Lateral Prefrontal Syndrome: A Disorder of Executive Control 259 Robert T. Knight and Mark D’Esposito Contributors 281

1. 根据算符∇ 的微分性与矢量性 推导下列公式 A B B A B A A B A B r r r r r r r r r r ∇( ⋅ ) = × (∇ × ) + ( ⋅∇) + × (∇ × ) + ( ⋅∇) A A A A A r r r r r ( ) 2