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
37
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.
【F1】
选项
答案
GE作为美国一个庞大的企业集团正考虑采用“对比添加式”的加工流程(或者又称大家所熟悉的“3D印刷”)来加工超声波压电式换能器。
解析
转载请注明原文地址:https://kaotiyun.com/show/RdsZ777K
0
考研英语一
相关试题推荐
Whilefashionisthoughtofusuallyinrelationtoclothing,itisimportanttorealizethatitcoversamuchwiderdomain.Iti
RuinsrecentlydiscoveredinsouthernPerucouldbetheancient"lostcity"ofPaititi,accordingtoclaimsthataredrawingser
RuinsrecentlydiscoveredinsouthernPerucouldbetheancient"lostcity"ofPaititi,accordingtoclaimsthataredrawingser
HighChargeofMedicalService高昂的医疗费用Writeanessayof160-200wordsbasedonthedrawing.Inyouressay,youshould1)describ
OnSupportingParents关于赡养父母Writeanessayof160-200wordsbasedonthedrawing.Inyouressay,youshould1)describethedraw
Manisbornfreebutiseverywhereindebt.Intherichworld,gettingholdofyourfirstcreditcardisariteofpassagefarm
Organizationsandsocietiesrelyonfinesandrewardstoharnesspeople’sself-interestintheserviceofthecommongood.Thet
Intheory,agovernmentbailoutshouldprovideashort-term"infusionofcashtogiveastrugglingcompanythechancetorighti
Athleteswhocheatbyinjectingthemselveswithstoredsuppliesoftheirownbloodmightsoonbecaughtout.Arevealingtrailo
Whetherwewantitornotweareallgreedybynature.Fromthemomentweare【C1】______andtothelastdayofourlifewe【C2】___
随机试题
工资机制作用下,与劳动者获得的工资额成正比的是()
设L是从点(0,0)到点(1,1)的有向线段,则曲线积分∫LydX+xdy=__________.
下列药物中不宜制成胶囊的有
某省卫生厅依《药品管理法》对所属药品公司进行管理而形成的相互关系,是()。
注意事项1.本题本由给定资料与作答要求两部分构成。考试时限为150分钟。其中,阅读给定资料参考时限为40分钟,作答参考时限为110分钟。满分150分。2.监考人员宣布考试开始时,你才可以开始答题。3.请在题本、答题卡指定位置填写自己的姓名,填涂准考证
根据以下资料回答101-105题2009年第一季度,我省第一产业实际利用外资0.27亿美元,下降43.1%,第二产业实际利用外资23.22亿美元,下降4.7%。服务业仍然是今年外商实际投资的亮点。一季度,服务业实际利用外资13.65亿美元,占全省的比重为
铸造金属舌面板最适合于()。
设D1是由曲线y=和直线y=a及x=0所围成的平面区域;D2是由曲线y=和直线y=a及x=1所围成的平面区域,其中0<a<1.(Ⅰ)试求D1绕x轴旋转而成的旋转体体积V1;D2绕y轴旋转而成的旋转体体积V2(如图3.8);(Ⅱ)问当a为
执行返回指令,退回中断服务程序,这时返回地址来自( )。
Thecompanyfelt______atPresidentObama’scriticism.
最新回复
(
0
)