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Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. University of Missouri (MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient.
"To provide enough power, we need certain methods with high energy density(密度)" ,said Jae Kwon, assistant professor of electrical and computer engineering at MU. "The radioisotope (放射性同位素) battery can provide power density that is much higher than chemical batteries. "
Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro/nanoelectromechanical systems (M/NEMS). Although nuclear batteries can cause concerns, Kwon said they are safe.
"People hea
A. He teaches chemistry at MU.
B. He developed a chemical battery.
C. He is working on a nuclear energy source.
D. He made a breakthrough in computer engineering.
Divorces in Japan have more than doubled, from just over 95 000 in 1970 to 206 955 in 1996, according to health ministry statistics. One in three Japanese marriages now ends in divorce.
Atsuko Okano was in one of those failed marriages. Three years ago, she found herself alone in her 30s, with children to raise and a future full of question marks and social shame. But she al so saw an opening — and became a consultant helping people like herself.
"My husband was cheating on me," she recalls. "I did everything to bring him back to me but it didn’t work, so I dumped him." Such frankness is a major characteristic of Japan’s recently divorced — and a striking break with the past.
Divorced people — particularly women—have long been looked down upon in Japan, where self-sacrifice and family stability are regarded ms ideals. In the past, bored housewives remained bored. Philandering(逢场作戏) husbands philandere
A. are granted respectability after they get divorced
B. are becoming brave enough to challenge the taboo of divorce
C. still regard the security of the family unit as very important
D. are becoming more financially independent
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