-
1
．
Three university students in Santiago,Chile have developed a phant-powerd device to charge
their mobile three engineering students got the idea for the device while sitting
in
their
school
’
s
invention
is
a
small
biological
circuit
they
call
captures the energy plants produce during uses only a small part of
the
energy
produced
by
that
process,The
rest
goes
into
the
soil.E-Kaia
collects
that
device plugs into the ground and then into a mobile E-Kaia solved two
problems
for
the
engineering
studnts,They
needed
an
idea
for
a
class
also
needed
an
outlet
to
plug
in
their
of
the
student
inventors,CamilaRupcich,says
the
device
charges
the
energy
released
from
the
plant
into
low-level
power
to
charge
E-Kaia
is
able
to
fully
recharge
a
mobile
phone
in
less
than
two
hours.I
’
m
Jonathan Evans.
2
．
University of Washington researchers say they used a laser to turn hot water into cool water.
Five
engineers
from
the
university
are
the
first
in
the
50-year
history
of
the
laser
to
refrigerate
liquids
under
normal
conditions
with
light
beams.
The
group
used
a
simple
approach
to
the
experiment.
Lasers
are
known
for
producing
hot
temperatures.
The
University of Washington says they “essentially ran the laser phenomenon in reverse.”
The
discovery
has
a
future
in
the
computer
and
medical
fields.
Computer
interiors
could
be
cooled
by
lasers.
In
a
medical
laboratory,
individual
cells
could
be
cooled
to
see
how
they
react.
“
Few
people
have
thought
about
how
they
could
use
this
technology
to
solve
problems
because
using
lasers
to
refrigerate
liquids
hasn’t
been
possible
before,”
said
researcher
Peter
cool
laser
concept
can
also
be
used
in
manufacturing,
telecommunications
or
national
group
has
an
interest
in
hearing
from
businesses
or
scientists
who
may
have
every
day
applications
for
the
cool
laser.
The
findings were published this month in the Proceedings of the National Academy of Sciences.
I’m Marsha James.
3
．
The United States is marking the 14th anniversary of the September 11th terrorist attacks.
U.S.
officials
and
many
other
Americans
attended
observances
Friday
to
remember
those
killed and their loved ones. Nearly 3,000 people died on September 11, 2001 when hijackers
used four passenger airplanes to carry out suicide attacks in the United States. In addition to
the victims, the 19 hijackers also were killed. Al-Qaida leader Osama bin Laden and his group
claimed responsibility for the attacks. U.S. forces killed him in a surprise raid on his hiding
place in Pakistan four years ago. Friday morning, President Barack Obama, his wife and White
House workers observed a public moment of silence in Washington. They gathered on the
White House grounds at 8:46. That was the exact time when a hijacked airplane struck the
World Trade Center. In New York, families of the victims gathered for a ringing of bells and
reading of the names of those killed in the terrorist attacks. Moments of silence were held at
8:46 and 9:03 in the morning, when a second hijacked plane also hit the World Trade Center.
Near
Washington,
U.S.
Defense
Secretary
Ash
Carter
and
other
officials
attended
an
observance
at
the
Pentagon,
the
home
of
the
Defense
Department.
They
joined
in
remembering
those
killed
when
a
hijacked
airplane
hit
the
Pentagon,
killing
184
people.
Earlier
Friday,
a
large
American
flag
was
hung
down
the
side
of
the
Pentagon,
where
the
passenger jet hit. There also was a moment of silence at 10:03 a.m. That was the time when
a
fourth
hijacked
plane
crashed
in
western
Pennsylvania.
All
44
people
on
the
plane
were
killed. Many Americans believe the hijackers had planned to attack a target in the nation’s
-
-
-
-
-
-
-
-
本文更新与2021-01-25 18:44，由作者提供，不代表本网站立场，转载请注明出处：https://www.bjmy2z.cn/gaokao/566770.html