首页
登录
职称英语
The oceans, which cover nearly three-quarters of Earth’s surface, remain lar
The oceans, which cover nearly three-quarters of Earth’s surface, remain lar
游客
2023-07-26
52
管理
问题
The oceans, which cover nearly three-quarters of Earth’s surface, remain largely unexplored because of their vastness and inaccessibility to us air breathers. Webb Research of East Falmouth, Massachusetts, hopes to open up much of that mystery field with a new underwater vehicle that is pushed ahead solely by the ocean itself, so it can potentially study the watery depths for years at a time. Such long-lasting detectors may someday form fleets that provide up-to-minute data for weather forecasting.
In the past, such autonomous underwater vehicles, or AUVs, have been battery powered and therefore required frequent recharges that limited their distance and depth of travel. Webb’s Slocum glider(滑翔机) hopes to solve this problem. "We conceived of a thermally powered engine to get the energy from the colder deep water of the ocean and the shallower warm water," Clayton Jones, an engineer at Webb Research, explains. "We picked out a material that undergoes a state change between those two temperatures in the ocean." When cold, this form-shifting substance is a compact solid. When warm, it expands and becomes a less dense liquid. The material’s expansion in warmer waters charges an internal mechanism that acts like stored power to control its buoyancy: by pumping mineral oil in and out of an external air bag, it alters its volume but maintains its weight. "The glider takes up more volume and becomes lighter than the water around it--less dense," Jones says.
Scientists can also fit the Slocum glider with a variety of different sensory equipment and Global Positioning Systems. Each time it surfaces, it can raise its tail antenna(天线) to transmit data to and receive instructions from researchers sitting comfortably in their cozy offices. The glider will have its first test in salt water at the end of this September.
The gliders could also get through and follow previously unstudied phenomena such as small underwater eddies (漩涡), which are vital to understanding water transport and heat flow in the ocean and therefore play an important role in storm formation and other weather development. "We have all these data snapshots(快照) from floats that just flow with the deep ocean current," Jones says. "To be able to fly through eddy sections, then transport with the whole eddy itself as it moves through the ocean, would be a very nice phenomenon to take a look at." [br] The new underwater vehicle is designed to ______.
选项
A、explore the vastness of the sea
B、transport people faster than boats
C、measure the depths of oceans
D、provide data for predicting weather
答案
A
解析
由题干中的The new underwater vehicle定位到原文首段第二句,Webb Research of East Falmouth...for years at a time.”。
转载请注明原文地址:https://tihaiku.com/zcyy/2869708.html
相关试题推荐
Londonhasbeena【B1】______cityfornearly1,000years,andmanyofits【B2】
Londonhasbeena【B1】______cityfornearly1,000years,andmanyofits【B2】
Londonhasbeena【B1】______cityfornearly1,000years,andmanyofits【B2】
Londonhasbeena【B1】______cityfornearly1,000years,andmanyofits【B2】
Londonhasbeena【B1】______cityfornearly1,000years,andmanyofits【B2】
Londonhasbeena【B1】______cityfornearly1,000years,andmanyofits【B2】
Londonhasbeena【B1】______cityfornearly1,000years,andmanyofits【B2】
ManyaresurprisedtolearnthatAntarctica(南极)isnearlytwicethesizeof
ManyaresurprisedtolearnthatAntarctica(南极)isnearlytwicethesizeof
ManyaresurprisedtolearnthatAntarctica(南极)isnearlytwicethesizeof
随机试题
【S1】[br]【S4】many→few上文提到“地震学是一门比较新兴的科学研究”,因为“直到18世纪有关地震的真实描述几乎还没有什么(few)记载”。逻辑
Themajorityoftheboardmanagreedwiththeproposalthat______(妇女在工作和生活中应得到公平
【B1】[br]【B6】A、divorcedB、separatedC、isolatedD、brokenA逻辑衔接题。既然是再次结婚,那么他们是离过婚
Recentlycertaincountermeasures__________(阻止破坏环境)havebeenintroducedtothep
患儿女,4岁。发热伴咳嗽3~4天,今出皮疹,住外院拟诊"药物疹",口服阿司咪唑(
在学校情境中,大部分问题的解决是通过各个学科中的具体问题来体现的。试结合实际,论
与今天的大熊猫不同,大熊猫祖先的饮食非常多元,那么大熊猫是从什么时候开始以食用竹
保险的原则包括()。A.诚信原则 B.可保利益原则 C.经济效益原则 D
(2018年真题)根据民事诉讼法律制度的规定,下列民事纠纷中,当事人不得约定纠纷
为规范项目成本管理行为,管理行为控制程序所制定的约束和激励体系的主要内容有()
最新回复
(
0
)