1、早期的太阳系 The Early Solar System Billions of years ago, out of a swirling mass of gas and dust, evolved a system of varied planets hurtling around a nuclear-powered star-our solar system. One of these planets, and one only, give rise to complex life forms. Over time

cell receptor when complexed with MHC,are called antigens. The molecular properties of antigens and he way in which these properties ultimately contribute to immune activation are central to our understanding of the mmune system. This chapter describes some of the molecu- Complementarity of Interacting Surfaces of Antibody(left) lar features of antigens recognized by B or T cells. The chap and Antigen(rig ter also explores the contribution made to immunogenicity by the biological system of the host; ultimately the biological system determines whether a molecule that combines with a a Immunogenicity Versus Antigenicity Bor T cells antigen-binding receptor can then induce an im

What is architecture? Logical and physical embodiment of a system Mechanism that Shapes the functional and physical boundaries of the system Governs the behavior and structure of the system

• contemporary computer systems allow multiple programs to be loaded into memory and executed concurrently • A system therefore consists of a collection of processes (a program in execution): operating system processes executing system code and user processes executing user code. • Process Concept • Process Scheduling • Operations on Processes • Interprocess Communication • Examples of IPC Systems • Communication in Client-Server Systems*

defense system that has evolved to protect animals from invading pathogenic microorganisms and ancer. It is able to generate an enormous variety of cells and molecules capable of specifically recognizing and eliminat ing an apparently limitless variety of foreign invaders. These cells and molecules act together in a dynamic network whose omplexity rivals that of the nervous system. Functionally, an immune response can be divided into two related activities--recognition and response. Immune

• 2.1 Operating System Objectives and Functions • 2.2 The Evolution of Operating Systems • 2.3 Major Achievements • 2.4 Developments Leading to Modern Operating Systems

Hazard log Information System, subsystem, unit Description Cause s Possible effects, effect on system Category(hazard level --probability and severity) Design constraints

 Introduction  Concept of Reactive power in power system  Control and management of reactive and voltage  Difference between active power & frequency regulation  Importance of voltage control  Measures for voltage control  Rules of reactive compensation and voltage control  Excitation control of generator

Interactive Complexity Complexity is a moving target The underlying factor is intellectual manageability 1. A\simple\system has a small number of unknowns in its nteractions within the system and with its environment

Outline Fundamental Principles of Accounting Information system diagram of the accounting process Accounting System Components General Journal Transactions Computerized Accounting Information System