Proponents of green chemistry are now eager to assess how far it has gone in providing environmental and economic benefits for the chemical and other manufacturing industries. Although there are few examples of green processes that have had an industry-wide impact, hundreds of individual products or processes have been improved through the principles of green chemistry. It's clear that progress has been made, but most observers agree that the pace of implementing green technologies needs to be picked up.
Verne and Wells both failed to foresee some of the most basic aspects of twenties-century life: the dominance of the private automobile over other means of transportation, the ubiquity of telephones and personal computers, the rapid disappearance of colonial empires. Their most basic mistake was their belief that technology would always become bigger and bigger rather than smaller and smaller.
After many false starts, he hit upon titanium as the metal center for the catalyst, and his team developed a titanium alkoxide that showed promise. This was in January 1980, and within two years the 'Sharpless epoxidation', as the textbooks now call it, had had its first commercial success:
My Palestinan father had journeyed to the United States on a ship in 1951,throwing his faded trousers from Jericho into the water just before the boat docked in New York City.
A university scholarship student,he'd requested a school "in the middle of America," thinking the location would give him easy access to everywhere. お願いします。
『God,I found the key,I found the key But how come doesn't work the sling door is closing I am stuck here』 全体的にはなんとなくは分かるのですが、"I am stuck here"っていうのは、 「僕はここに(鍵を)挿したのに」と、 「僕はここに突っ立ったままだ」と、どっちなんでしょうか? それとも、両方とも間違っていますか?
The halogens react with most of nonmetal elements (including themselves) and metalloids, and their reactions produce compounds with covalent bonds. They are, therefore, usually molecular compounds with relatively low melting points and boiling points, which characterize a small amount of intermolecular forces, such as dipole-dipole attractions, hydrogen bonds, and London dispersion forces.
Although he would miss his homeland deeply and always be dreaming of it,he dove into his new life with enthusiasm. 彼は望郷の念にかられ、故郷を懐かしがることになるだろう。 だが彼は熱い期待を抱いて新しい生活に踏み出した。