Solid wastes include all solid or semisolid materials that the possessor no longer considers of sufficient value to retain. The management of these waste materials is the fundamental concern of all the activities encompassed in solid waste management—whether the planning level is local, regional or subregional, or state and federal. For this reason, it is important to know as much about municipal solid waste (MSW) as possible. The purpose of this chapter is to identify the sources, types, and composition of solid wastes

Nutritional requirements To live to grow and thrive, humans must take in nutrients from their environment Before birth there are supplied by the mother, but ereafter they must be ingested If too little is provided, the infant will not grow and may become ill, and too much may lead to toxicity or obesity

Solid wastes comprise all the wastes arising from human and animal activities that are normally solid and that are discarded as useless or unwanted. The term solid waste as used in this text is all-inclusive, encompassing the heterogeneous mass of throwaways from the urban community as well as the more homogeneous accumulation of agricultural, industrial, and mineral wastes. This book is focused on the urban setting, where the accumulation of solid wastes is a direct consequence of life

Contents Part I Wastewater Engineering 1 Wastewater Engineering: An Overview 2 Constituents in Wastewater 3 Analysis and Selection of Wastewater Flowrates and Constituent Loadings 4 Introduction to Process Analysis and Selection 5 Physical Unit Operation

Objective 1、Definition、types and mechanism of osteoporosis 2、 Diagnosis、prevention and treatment of osteoporosis 3 、Etiology and Epidemiology of osteoporosis

Surface quality is another aspect of machining accuracy. It consists of the surface finish and the physic mechanical state of the surface layer. It affects the proper functioning and service life of the parts Surface Finish Machining accuracy is expressed quantitatively in machining error. Surface finish is expressed quantitatively in surface roughness. The surface roughness on a machined workpiece surface is caused primarily by the geometrical factors(cutting tool geometry and cutting

The Lathe And Its Construction A lathe is a machine tool used primarily for producing surfaces of revolution and flat edges. Based on their purpose, construction, number of tools that can simultaneously be mounted and degree of automation, lathes-or, more accurately, lathe-type machine tools-can be classified as follows:

1. History 1921.12. 16, Fritz Winkle observed the phenomena of fluidization and developed the gasifigator 1939. Warren Lewis and edwin gillil and discovered the technique of catalytic cracking with fast fluidization 1960s Douglass elliott began to use fluidized bed to produce steam

Chapter 2 Basic Analytical Tools 1. General Equilibrium Analysis一般均衡法 1) GEA means analyzing two or more than two related markets at the same time(eg. Export Market and Import Market, Goods Market and Factor Market) 2) We usually use the PPF and CICas the basic tools in the general equilibrium analysis of international trade

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