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9.1 Introduction Drying is probably the oldest form of preservation Wrapping things that have been dried to protect them from moisture may well have been the earliest form of packaging. Even today a lot of technological development resources are expended to find new ways to package things to keep them dry. Some of the oldest materials used to control moisture are still used today: clay, salt, minerals and plant extracts that have a greater affinity for water than the material being protected. Clay has been used for centuries; moist clay to keep things moist and dried clay to keep things dry. Likewise the importance of salt is legendary

he value of alkyl halides as starting materials for the preparation of variety of organic functional groups has been stressed many times. In our earlier discussions, we noted that aryl halides are normally much less reactive than alkyl halides in reactions that involve carbon-halogen bond cleavage. In the present chapter you will see that aryl halides can exhibit their own patterns of chemical reactivity, and that these reac

Introduction Packaging can be unnecessarily expensive in a couple of ways: 1. Inadequate design results in shipment damage 2. Over-design or poor design (more protection than is required or materials being incorrectlyused) results in excessive material cost. The procedure can be broken down into seven basic steps

SACHUSE Massachusetts Institute of Technology Harvard Medical School Brigham and Women's/Massachusetts General Hosp

Section I Listening Comprehension Directions: This section is designed to test your ability to understand spoken English. You will hear a selection of recorded materials and you must answer the questions that accompany them. There are three parts in this ection, Part A, Part B and Part C. Remember, while you are doing the test, you should first put down your answers in your test booklet. At the

SUMMER: NETEM: CB2 Section i Listening comprehension Directions: This section is designed to test your ability to understand spoken English. You will hear a selection of recorded materials and you must answer the questions that accompany them. There are three parts in this section, Part A, Part B and Part C. Remember, while you are doing the test, you should first put down your answers in your test booklet. At the end of the listening comprehension section, you will have 5 minutes to transfer all your answers from your

材料(Materials)是国民经济的物质基 础。 广义的材料包括人们的思想意识之外 的所有物质(substance)

Outline Carbon fibers Glass fibers Aramid fibers Ultra High Modulus Polyethylene fibers Carbon nanotubes Ceramic fibers Mechanical properties of fibers

《材料科学概论》英文版PPT讲义课件（Introduction to Materials Science and Engineering）