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The housewives learnt about the information of free goods ()
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Intelligent car door clamps up when danger’s about Accidents caused by car doors being opened into the path of oncoming vehicles or cyclists are common in cities. But these incidents could become a thing of the past, if doors that react to potential impacts catch on. The creative idea of Michael Graf at BMW and Michael Strolz’s team at the Technical University of Munich, the "haptic"-technology that gives tactile feedback-doors could cut both road injuries and repair bills, they say. The current prototype looks like a normal car door, but an extra metal bar runs through its centre and connects to the car’s frame between the hinges. In normal mode, the bar moves freely and doesn’t affect the door’s movement. However, if sensors detect a nearby obstacle at the same time as an accelerometer detects an attempt to open the door, the door’s swing is restricted by a linear motor attached to the bar. To pass on more information to the user, the amount of door resistance is in proportion to the proximity of an object-for example, you might swing a door halfway open without problems before it gets stiffer as it nears a lamp post. The current prototype uses supersonic sensors to spot dangers, but because they have a limited field of view, the next version will use cameras that can span 180°, says Strolz. "Then we will be able to sense the complete workspace of the door and detect people walking by the car or cycling towards it," he says. Reactions from 16 volunteers who tried the new door at BMW’s Munich research centre have been encouraging, the team told a recent conference on haptics in Salt Lake City, Utah. The technology is mature enough that a car factory could be pumping it out in cars within a year, says Strolz. The basic mechanism is like one already featured in some cars-for example, taxis with automatic passenger doors. However, BMW is yet to make any decision on whether to roll it out. What does the current prototype use to sense dangers
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What will an Autoweb. com Dealer do for usHe will ______ and inform us of the vehicle’s availability.
Don’t Treat Animals as Furry Test-tubes Most of us agree that there is a moral obligation to minimize the suffering of any captive animals. In addition, there are numerous self-serving reasons why we should respect the welfare of our captive companions. However, the impact of poor animal welfare on the quality of animal science always concerns a scientist the most. Rodents(灵长类动物) make up over 80% of the animals used in scientific procedures, and most are kept in small, barren cages. Such housing is known to constrain normal development, affecting the structure and function of adult rodent brains. These rodents may spend 50% of waking hours performing repetitive activities without apparent purpose. This abnormal behavior is likely to reflect what is going on inside the body. As ethnologist Hanno Wfirbel, of the Justus Liebig University of Giessen, Germany, puts it," The point that the environment might change behavior but it doesn’t change biology is ridiculous. Every behavior has a physiological background." If welfare affects behavior, and therefore biology, it will affect scientific outcomes. As long as we continue to treat experimental animals as simple" furry test-tubes", ignoring their abilities and needs, we endanger the quality of the work we do with them. So, how can we improve life for other species when we cannot experience it as they do We’d better ask the animals. Ask them what they need, and what causes them suffering, through carefully designed preference tests and in-depth behavioural research. Scientists have already begun this task, and have been told some important and unexpected facts by their study subjects. By consistently self-medicating with pain killers, broiler chickens (嫩鸡) have told us that they are in chronic pain. By moving a barrier twice their size, mink (水貂) have told us that water baths are the most important enrichment for them. By only stopping their fruitless stereotypic digging in certain circumstances, gerbils(沙鼠) have told us that they need to be able to sleep in tunneled nest-boxes. By behaving normally again, starlings have told us that they need high frequency light bulbs. Which of the following is true about scientists’ discovery about animals’ needs and sufferings
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