15. Scan the article “Vacuum Technology Developed to Control Insects in Wood.” Divide the text into logical parts.

Virginia Tech wood scientists hope that their vacuum-drying project will benefit wood pallet and container manufacturers and hardwood sawmill businesses across the nation. The vacuum controlling system eliminates the need for a heating system, saves energy, and does not release ozone-depleting chemicals into the earth’s atmosphere," says Zhangjjng Chen, one the researchers working on the project at the Center for Unit Load and Design in the wood science and forest products department of Virginia Tech’s College of Natural Resources. "Plant sanitary measures currently require that wood pallets and containers, which pack goods that are imported or exported, should be heat-treated or fumigated", Chen explains. In response to these requirements, the Center for Unit Load and Design is developing the basis for vacuum control of insects in solid wood packaging materials, which would serve as an alternative to the current method. Chen and his research partners project that low pressure, achieved by applying a vacuum to a system, will create an environment sufficiently low in oxygen that will eliminate the insects in several hours to days. Their research data indicates that there may be an opportunity to apply this technology to eliminate insects in wood. The material being tested is freshly cut red oak. same. Experts believe that the Asian Longhorn Beetle was introduced in America via infested shipping materials. Principal investigators responsible for the vacuum control project include Virginia Tech’s wood science and forest products research specialist Zhangjjng Chen, professor Marshall White, and entomologist professor William H. Robinson. Chen and White work with the wood and moisture relationship that occurs in vacuum drying. Robinson has extensive knowledge on wood insects.

16. Grammar Tutorials. Degrees of Comparison Scan the text. Give the name to the text. Rewrite and translate all the adjectives from the text. Choose the best sentence or some sentences which illustrate the main idea of the text and read them to your teacher.

One exciting thing that has come out of nanotechnology research is the single-walled carbon nanotube. It is basically a very tiny (1 billion times smaller than a meter) tube that resembles a rope. Heating ordinary carbon until it vaporizes, then allowing it to condense in a vacuum or an inert gas creates them. The carbon condenses in a series of hexagons that curl and connect into hollow tubes. The most interesting thing about the nanotube is that it is the strongest, most conductive, and stiffest material ever made. It is sixty times stronger than steel. Many suggest that a nanotube cable the size of a human hair could easily suspend a locomotive or reach from the Earth to the Moon. Can you imagine a rope to the moon? Nanotube fibers can be used to make bulletproof vests that are 17 times stronger than normal Kevlar vests.

One of the advantages of using nanotubes is that because they are so small they are much lighter as well. All materials, which are made with nanotubes, will be stronger and lighter.

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