首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
考研
【F1】GE, a large American conglomerate, is now proposing to make ultrasound transducers by "additive"manufacturing—or three-dimen
【F1】GE, a large American conglomerate, is now proposing to make ultrasound transducers by "additive"manufacturing—or three-dimen
admin
2016-03-22
59
问题
【F1】
GE, a large American conglomerate, is now proposing to make ultrasound transducers by "additive"manufacturing—or three-dimensional printing, as it is also known.
A new laboratory at the firm’ s research centre in Niskayuna, New York, is taking a hard-headed look at the technique, which some see as a fad and others as the future, and working out which products might be made more efficiently by addition rather than subtraction.
【F2】
The GE process for making a transducer begins by spreading onto the print table a thin layer of ceramic slurry containing a light-sensitive polymer.
This layer is exposed to ultraviolet light through a mask that represents the required pattern. Wherever the light falls on the polymer it causes it to solidify, binding the particles in the slurry together. The print table is then lowered by a fraction of a millimetre and the process repeated, with a different mask if required. And so on. Once finished, the solidified shape is cleaned of residual slurry and heated in a furnace to sinter the ceramic particles together. More work will be needed to turn the process into a production-ready system. But Prabhjot Singh, who leads the project, hopes that it will be possible to use it to make not just cheaper ultrasound probes, but also more sensitive ones that can show greater detail.【F3】
Although researchers have had new transducer designs in mind for years, it has been impractical to construct them subtractively.
Additive manufacturing could change that.
The new laboratory will look at other forms of additive manufacturing, too.【F4】
Some 3D printers spread metal powders on the print table and sinter the pattern with lasers or electron beams, rather than using masks.
Others deposit thin filaments of polymer in order to build structures up. GE is interested in how the technology could be used right across the firm’s businesses, from aerospace to power generation and consumer products, according to Luana Iorio, head of manufacturing technologies at GE Global Research.
The gains include less waste and the ability to make bespoke parts more easily. But one of the most compelling advantages is freeing designers from the constraints of traditional production. Those constraints include having to design things not in their optimal shape but to be machined, often as a series of pieces. Additive manufacturing can combine parts into a single item, so less assembly is needed. That can also save weight—a particular advantage in aerospace.【F5】
These new production opportunities mean manufacturers, big and small, are about to become a lot more inventive.
【F3】
选项
答案
多年以来,压电式换能器的研究者们一直都有新型设计的想法,但应用“对比相减式”的加工流程实际上很难能把这样的构想变为现实。
解析
转载请注明原文地址:https://kaotiyun.com/show/DdsZ777K
0
考研英语一
相关试题推荐
There’salotofmoneyinreligion.Lookatthetax-freeincomeofAmericanTVevangelists,oratStPeter’sandallthegoodies
There’salotofmoneyinreligion.Lookatthetax-freeincomeofAmericanTVevangelists,oratStPeter’sandallthegoodies
There’salotofmoneyinreligion.Lookatthetax-freeincomeofAmericanTVevangelists,oratStPeter’sandallthegoodies
Americansbelievenoonestandsstill.Ifyouarenotmovingahead,youarefallingbehind.Thisattituderesultsinanationof
Americansbelievenoonestandsstill.Ifyouarenotmovingahead,youarefallingbehind.Thisattituderesultsinanationof
Newspapersarebecomingmorebalancedbusinesses,withahealthiermixofrevenuesfromreadersandadvertisers.Americanpapers
Newspapersarebecomingmorebalancedbusinesses,withahealthiermixofrevenuesfromreadersandadvertisers.Americanpapers
Whatmakesagreathighschool?Americansthinkalotofthingsdo,fromoutstandingacademicsorasupportiveenvironmentfors
随机试题
下列哪味药不是主治热结便秘的
A、苦笑面容B、伤寒面容C、甲亢面容D、二尖瓣面容E、慢性病面容消瘦,两眼球突出,兴奋不安,呈惊恐貌,多见于
对于土石围堰材料的要求,正确的有()。
导流建筑物级别一般划分为( )。
依法办理税务登记的单位和个人,在领取()后,向主管税务机关申请领购发票。
2016年7月,甲市乙县国税局对A公司进行税务检查时发现,该公司一笔账务处理异常。乙县国税局认为,该公司购进的某批布料用于非应税项目,其进项税额276000元不应抵扣。于是决定:依法追缴A公司少缴的增值税税款,加收相应的滞纳金并根据A公司少缴增值税税款的5
下列关于商业银行风险管理策略的说法中,正确的有()
根据班杜拉的社会认知理论,为了提高自我效能感,当个体取得学业成功时,应将其成功归因于()。
顾客为购买某一产品所耗费的时间、精力、体力以及所支付的货币资金等是指()。
关于RSA算法的描述中,正确的是()。
最新回复
(
0
)