(难度B/A级/2010年理工类教材新增Gavin章)

by admin on 2019年11月8日

(难度B/A级/2009年理工类教材新扩张文章)

So there we have it. We have this really important problem and we have
what is basically the ideal solution. The science is screaming at us,
“This is what you should be doing to solve your problem.” So, all right,
let’s get started, let’s do this. But you just run right back into that
double-edged sword. This “ideal solution” contains a material that’s
impossible to work with. I’d have to arrange billions of them just to
make one single computer chip. It’s that same conundrum, it’s like this
undying problem.

A An introduction of a Toyota’s 225 horsepower V6 engine.

4166.金沙登录 ,(Laughter)

B A description of the nanomotor in terms of power and size.

So our group’s role and our group’s mission is to innovate by employing
carbon nanotubes, because we think that they can provide a path to
continue this pace. They are just like they sound. They’re tiny, hollow
tubes of carbon atoms, and their nanoscale size, that small size, gives
rise to these just outstanding electronic properties. And the science
tells us if we could employ them in computing, we could see up to a ten
times improvement in performance. It’s like skipping through several
technology generations in just one step.

E The working principle of the nanomotor.

So we decided that we’re going to use the same tool that nature uses,
and that’s chemistry. Chemistry is the missing tool. And chemistry works
in this case because these nanoscale objects are about the same size as
molecules, so we can use them to steer these objects around, much like a
tool. That’s exactly what we’ve done in our lab. We’ve developed
chemistry that goes into the pile of dust, into the pile of
nanoparticles, and pulls out exactly the ones we need. Then we can use
chemistry to arrange literally billions of these particles into the
pattern we need to build circuits. And because we can do that, we can
build circuits that are many times faster than what anyone’s been able
to make using nanomaterials before. Chemistry’s the missing tool, and
every day our tool gets sharper and gets more precise. And eventually —
and we hope this is within a handful of years — we can deliver on one
of those original promises.

C [u]Surface tension[/u](表面伊哈洛卡塔尔国.

Now, as odd as that sounds, that is almost exactly the problem I work on
in my lab. I don’t build with stone, I build with nanomaterials. They’re
these just impossibly small, fascinating little objects. They’re so
small that if this controller was a nanoparticle, a human hair would be
the size of this entire room. And they’re at the heart of a field we
call nanotechnology, which I’m sure we’ve all heard about, and we’ve all
heard how it is going to change everything.

正规赌博十大网站app ,假使段落中有显然的“细节音讯词”,
能够构思选取那几个细节消息所呈现的主旨内容来确认段落宗旨。

The point is the progress — it’s not gradual. The progress is
relentless. It’s exponential. It compounds on itself year after year, to
the point where if you compare a technology from one generation to the
next, they’re almost unrecognizable. And we owe it to ourselves to keep
this progress going. We want to say the same thing 10, 20, 30 years from
now: look what we’ve done over the last 30 years. Yet we know this
progress may not last forever. In fact, the party’s kind of winding
down. It’s like “last call for alcohol,” right? If you look under the
covers, by many metrics like speed and performance, the progress has
already slowed to a halt. So if we want to keep this party going, we
have to do what we’ve always been able to do, and that is to innovate.

2010年教材上新添了差非常少17篇小说,词汇选项,阅读判定, 总结大体完结句子,
阅读精晓, 补全短文, 完型填空各样题型上都有新添小说。
理工科类和卫生类新添的稿子更浮现专门的学问性。新扩大随笔的言语难度和难题考试之处设置景况在早晚水准上呈现了08年课题的出题趋向。

When I was a graduate student, it was one of the most exciting times to
be working in nanotechnology. There were scientific breakthroughs
happening all the time. The conferences were buzzing, there was tons of
money pouring in from funding agencies. And the reason is when objects
get really small, they’re governed by a different set of physics that
govern ordinary objects, like the ones we interact with. We call this
physics quantum mechanics. And what it tells you is that you can
precisely tune their behavior just by making seemingly small changes to
them, like adding or removing a handful of atoms, or twisting the
material. It’s like this ultimate toolkit. You really felt empowered;
you felt like you could make anything.

E The working principle of the nanomotor.

Now that last one, that’s a really important one. We just have come to
expect the pace of computing advancements to go on indefinitely. We’ve
built entire economies on this idea. And this pace exists because of our
ability to pack more and more devices onto a computer chip. And as those
devices get smaller, they get faster, they consume less power and they
get cheaper. And it’s this convergence that gives us this incredible
pace.

  1. Paragraph 4 ____.

  2. Although the amount of energy(能量) produced is small — 20
    microwatts( 百十分之生机勃勃瓦) — it is quite impressive( 给人影象浓烈的) in
    relation to(与…相比 卡塔尔国the tiny scale of the motor. The whole setup is
    less than 200 nanometers( 皮米) on a side, or hundreds of times smaller
    than the width(宽度) of a human hair. If it could be scaled up to the
    size of an automobile engine, it would be 100 million times more
    powerful(强大的卡塔 尔(阿拉伯语:قطر‎ than a Toyota ATENZA’s 225 horsepower(马力卡塔尔国 V6
    engine.

(Laughter)

F Possible fields of application in the future.

I know that’s an absurd notion. It’s probably impossible. The only way
you get a statue from a pile of dust is if the statue built itself — if
somehow we could compel millions of these particles to come together to
form the statue.

  1. Paragraph 2

  2. Paragraph 4

  3. Paragraph 5

  4. Paragraph 6

And we were doing it — and by we I mean my whole generation of graduate
students. We were trying to make blazing fast computers using
nanomaterials. We were constructing quantum dots that could one day go
in your body and find and fight disease. There were even groups trying
to make an elevator to space using carbon nanotubes. You can look that
up, that’s true. Anyways, we thought it was going to affect all parts of
science and technology, from computing to medicine. And I have to admit,
I drank all of the Kool-Aid. I mean, every last drop.

D Previous inventions of nanoscale(皮米级的卡塔 尔(阿拉伯语:قطر‎ products.

Now, as it turns out, this is not that alien of a problem. We just don’t
build anything this way. People don’t build anything this way. But if
you look around — and there’s examples everywhere — Mother Nature
builds everything this way. Everything is built from the bottom up. You
can go to the beach, you’ll find these simple organisms that use
proteins — basically molecules — to template what is essentially sand,
just plucking it from the sea and building these extraordinary
architectures with extreme diversity. And nature’s not crude like us,
just hacking away. She’s elegant and smart, building with what’s
available, molecule by molecule, making structures with a complexity and
a diversity that we can’t even approach. And she’s already at the nano.
She’s been there for hundreds of millions of years. We’re the ones that
are late to the party.

The Tiniest Electric Motor in the World

Thank you so much for your time. I appreciate it.

二零零六年考题预测剖判

At this point, we said, “Let’s just stop. Let’s not go down that same
road. Let’s just figure out what’s missing. What are we not dealing
with? What are we not doing that needs to be done?” It’s like in “The
Godfather,” right? When Fredo betrays his brother Michael, we all know
what needs to be done. Fredo’s got to go.

B A description of the nanomotor in terms of power and size.

But Michael — he puts it off. Fine, I get it. Their mother’s still
alive, it would make her upset. We just said, “What’s the Fredo in our
problem?” What are we not dealing with? What are we not doing, but needs
to be done to make this a success?” And the answer is that the statue
has to build itself. We have to find a way, somehow, to compel, to
convince billions of these particles to assemble themselves into the
technology. We can’t do it for them. They have to do it for themselves.
And it’s the hard way, and this is not trivial, but in this case, it’s
the only way.

提示:

Now, computing is just one example. It’s the one that I’m interested in,
that my group is really invested in, but there are others in renewable
energy, in medicine, in structural materials, where the science is going
to tell you to move towards the nano. That’s where the biggest benefit
is. But if we’re going to do that, the scientists of today and tomorrow
are going to need new tools — tools just like the ones I described. And
they will need chemistry. That’s the point. The beauty of science is
that once you develop these new tools, they’re out there. They’re out
there forever, and anyone anywhere can pick them up and use them, and
help to deliver on the promise of nanotechnology.

A An introduction of a Toyota’s 225 horsepower V6 engine.

Let’s imagine a sculptor building a statue, just chipping away with his
chisel. Michelangelo had this elegant way of describing it when he said,
“Every block of stone has a statue inside of it, and it’s the task of
the sculptor to discover it.” But what if he worked in the opposite
direction? Not from a solid block of stone, but from a pile of dust,
somehow gluing millions of these particles together to form a statue.

钦赐的五个段子都不曾鲜明的段落核心句(二零零六年理工科类A/B级归纳轮廓题中七个钦赐段落都并未明确性段落大旨句卡塔尔,考生能够透过通读钦定段落的忽略来综合出段落核心,
或依赖一些管用的答题技艺肯定段落大旨。以确认段落第4段的段子大旨为例深入分析答题手艺:

As an example: if I took the room-sized computer that sent three men to
the moon and back and somehow compressed it — compressed the world’s
greatest computer of its day, so it was the same size as your smartphone
— your actual smartphone, that thing you spent 300 bucks on and just
toss out every two years, would blow this thing away. You would not be
impressed. It couldn’t do anything that your smartphone does. It would
be slow, you couldn’t put any of your stuff on it, you could possibly
get through the first two minutes of a “Walking Dead” episode if you’re
lucky —

D Previous inventions of nanoscale(皮米级的卡塔尔国 products.

But that was 15 years ago, and — fantastic science was done, really
important work. We’ve learned a lot. We were never able to translate
that science into new technologies — into technologies that could
actually impact people. And the reason is, these nanomaterials —
they’re like a double-edged sword. The same thing that makes them so
interesting — their small size — also makes them impossible to work
with. It’s literally like trying to build a statue out of a pile of
dust. And we just don’t have the tools that are small enough to work
with them. But even if we did, it wouldn’t really matter, because we
couldn’t one by one place millions of particles together to build a
technology. So because of that, all of the promise and all of the
excitement has remained just that: promise and excitement. We don’t have
any disease-fighting nanobots, there’s no elevators to space, and the
thing that I’m most interested in, no new types of computing.

F Possible fields of application in the future.

2.B.拆解剖判:段落中平昔不分明性的段子宗旨句,
然而段子中冒出了汪洋呈现出色细节新闻的辞藻:20 microwatts(微瓦), 200
nanometers(微米卡塔 尔(英语:State of Qatar), hundreds of times smaller than the width of a human
hair, 100 million times more powerful, 225 horsepower(马力卡塔尔,
那一个细节消息贯穿全段, 从质量上它们各自用于描述功率和尺寸大小,
因而可直接判别B(描述了微米引擎的功率和尺寸大小卡塔尔是答案。

从2005年课题的出题情况和二〇一〇年教材的编辑撰写意况来看,二〇〇八年职务名称塞尔维亚语考试还是将恐怕从事教育工作材中摘选风华正茂部分课题直接当作考题。二〇〇八年课题难度应该与二零零七年课题难度卓绝。

C [u]Surface tension[(难度B/A级/2010年理工类教材新增Gavin章)。/u](表面张力卡塔 尔(英语:State of Qatar).

练习:

  1. Scientists recently made public the tiniest electric motor ever
    built. You could stuff hundreds of them into the period at the end of
    this sentence. One day a similar engine might power a tiny mechanical
    doctor that would travel through your body to remove your disease.

  2. The motor works by shuffling(来回运动卡塔 尔(阿拉伯语:قطر‎ atoms(原子卡塔尔国 between two
    molten metal droplets(小滴卡塔 尔(阿拉伯语:قطر‎ in a carbon nanotube(微米管卡塔 尔(阿拉伯语:قطر‎. One
    droplet is even smaller than the other. When a small electric current is
    applied to the droplets, atoms slowly get out of the larger droplet and
    join the smaller one. The small droplet grows – but never gets as big as
    the other droplet – and eventually bumps into the large droplet. As they
    touch, the large droplet rapidly sops up (吸入卡塔尔the atoms it had
    previously lost. This quick shift in energy produces a power
    stroke(动力路程卡塔 尔(阿拉伯语:قطر‎.

  3. The technique exploits the fact that surface tension — the tendency
    of atoms or molecules to resist separating — becomes more important at
    small scales. Surface tension is the same thing that allows some insects
    to walk on water.

  4. Although the amount of energy produced is small — 20
    microwatts(百特别之风华正茂瓦卡塔尔 — it is quite impressive(给人记念浓郁的卡塔尔国in relation to(与…相比较卡塔 尔(英语:State of Qatar) the tiny scale of the motor. The whole setup
    is less than 200 nanometers on a side, or hundreds of times smaller than
    the width of a human hair. If it could be scaled up to the size of an
    automobile engine, it would be 100 million times more powerful than a
    Toyota SANTANA’s 225 horsepower V6 engine.

  5. In 1989, Professor Richard Muller and colleagues made the first
    operating(工作的, 运维的卡塔 尔(英语:State of Qatar) micromotor(微型斯特林发动机卡塔尔国, which was 100
    microns(皮米卡塔尔 across, or about the thickness of a human hair. In 2004,
    Zettl’s group created the first nanoscale motor. In 二零零七, they built a
    nanoconveyor(皮米传送带卡塔尔国, which moves tiny particles along like cars
    in a factory.

  6. Nanotechnology(皮米本领卡塔尔 engineers try to mimic nature, building
    things atom-by-atom. Among other things, nanomotors could be used in
    optical circuits to redirect light, a process called optical switching.
    Futurists envision(预想卡塔 尔(英语:State of Qatar) a day when nanomachines(皮米机器卡塔尔国, powered
    by nanomotors(微米引擎卡塔 尔(阿拉伯语:قطر‎, travel inside your body to find disease and
    repair damaged cells.

相关文章

发表评论

电子邮件地址不会被公开。 必填项已用*标注

网站地图xml地图