the scientific american book
Tài liệu The Child''''s Book of American Biography pdf
Ngày tải lên :
18/02/2014, 08:20
... these nieces which made them nearly explode with laughter when their
mothers read them aloud. All the funny sights in Venice were described, and the stories about the children in
India made the ... an umbrella. They called themselves "Knights of
the Umbrella and Bundle."
The Thoreaus were rather a prominent family in Concord. There were six of them, all told. The father, Mr.
John ... needed money and decided to make the colonists pay a tax on tea and a few other things.
Then the American colonists were as angry as they could be. They tipped the whole cargo of tea into Boston
Harbor,...
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A reprint from American Scientist the magazine of Sigma Xi, The Scientific Research Society doc
Ngày tải lên :
15/03/2014, 01:20
... knowledge of the location and
altitude at which the device is explod
-
ed, and the local meteorology—particu
-
larly a three-dimensional characteriza
-
tion of the wind field in the vicinity of
the ... when the fireball from the explosion
cools sufficiently to lose buoyancy. HOOD
was the largest atmospheric test conducted at
the Nevada Test Site (and in the continental
U.S.). Fortunately, the ... California, at the same
time, the corresponding values would
have been 0.003, 0.01, and 0.0004 Gy.
(A link to these data is available in the
bibliography.)
Following the publication of the NCI
findings...
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The American Book Of The Dead pptx
Ngày tải lên :
15/03/2014, 06:20
...
the book you’re reading. So where’s the confusion? The book
was about a writer in his fifties working on a book. In the
future the book has yet to be written, even if it was written in
the ... what they did they were a part of
history: they belonged to the United States government. But
now they were sitting on the throne of God, the only being
higher than the president of the United ... something that was the
beginning of the end of the world.
Throughout my life I often felt like I was living in a shell of
the better past. The sixties, the Beat Generation, the Lost
Generation,...
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scientific american - 1993 01 - the turbulent birth of the milky way
Ngày tải lên :
12/05/2014, 14:48
... ones.
Determining the relative ages of the
halo and disk reveals much about the
sequence of the formation of the gal-
axy. On the other hand, it leaves open
the question of how old the entire gal-
axy ... tissue, the
antibody blocked the attachment of the
lymphocytes to high endothelial venules
SCIENTIFIC AMERICAN January 1993 87
cells. The L-selectins, or homing receptors, on lymphocytes determine the ... has
attached to the endothelium, it can migrate out of the blood vessel.
Copyright 1992 Scientific American, Inc.
66 SCIENTIFIC AMERICAN January 1993
The corals lose algae, leaving their tis-
sues so...
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scientific american - 1993 03 - black holes and the centrifugal force paradox
Ngày tải lên :
12/05/2014, 14:49
... determine the tension in
the spring. The tension, in turn, equals
the sum of the two forces acting on the
weight: the gravitational force and the
centrifugal force.
To measure either one of these ... gravitational Þeld of the black
hole (that is, the rays were straight),
the lamp would disappear behind the
left part of the tube, and Alice would
conclude that the tube was bent to the
left. If the light ... change
the orientation of their spaceships as
they orbit the black hole; both pilots
must rotate their spacecraft so that the
stretched spring always points toward
a mark on the hull. The direction...
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scientific american - 1993 04 - controlling the quantum jitters of atoms
Ngày tải lên :
12/05/2014, 14:49
... microkelvins.
In the process the coldest atoms mi-
grate to the center of the trap, whereas
the hotter atoms oscillate from one side
to the other. The hot atoms at the sides
of the trap can be ... ). They drop their colors and sneak into another maleÕs nest,
inseminating the eggs present there.
a
b
c
d
Copyright 1993 Scientific American, Inc.
the metal. The strong electric Þeld at
the ... survival, they may suÝer longer from the nonfatal but
highly disabling illnesses associated with old age.
SCIENTIFIC AMERICAN April 1993 51
Copyright 1993 Scientific American, Inc.
82 SCIENTIFIC AMERICAN...
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scientific american - 1993 06 - tuning in the radio signals of ancient galaxies
Ngày tải lên :
12/05/2014, 14:49
... demon-
strated in the laboratory.
The EPR phenomenon is the linchpin of quantum teleportation. Alice takes
one of the EPR photons and gives the other to Bob. Bob then moves to an-
other location with the photon. ... Furthermore, if the hot
end of the rod is then plunged into ice,
a wave of cooling will follow the wave
of heat down the length of the metal.
In the same way, temperature ßuctua-
tions at the ... throughout the length of the
cilium. In addition, an extra pair of mi-
crotubules not found in the centriole
develops along the axis. The structure
of the axoneme mirrors the ninefold
symmetry of the...
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scientific american - 1993 09 - special issue - life, death, and the immune system
Ngày tải lên :
12/05/2014, 14:50
... response to the an-
tigen; soon their clones make up most
of the population in the centers.
While they are proliferating, the B
cells also diÝerentiate and mutate. They
modify the DNA in their gene ... SSC. Like
other colleagues at the laboratory, Bill
entered the Þeld to unravel the great
mysteries of physics, among them the
question of why all the fundamental
particles have the masses they do. ... the House voted to halt the SSC, the
Senate rescued the laboratory. The fate
of the collider now rests on the ability
of the Senate to pull oÝ the same feat
this year. The SenateÕs chief SSC advo-
cate,...
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scientific american - 1993 10 - is los angeles winning the war on smog
Ngày tải lên :
12/05/2014, 14:50
... between these two particles de-
pends on the way they approach each
other. If the Þrst moves up directly be-
neath the second, then the positively
charged top of the Þrst is closest to the
negatively ... to the forces at-
tracting or repelling them. At the same
time, no matter in which direction the
particles are headed, their poles point
either up or down toward the elec-
trodes. Together these ... closer to forcing the particles side
by side. If the chains tilt too far, the
particles slip out of the zone in which
they mutually attract, the chains break
and the material ßows. The amount of
stress...
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scientific american - 1993 11 - reading the genes of extinct species
Ngày tải lên :
12/05/2014, 14:50
... ÒDonahue.Ó Then,
recalling the way he comforted the
pregnant graduate student, I think,
Why not? ÑJohn Horgan
38 SCIENTIFIC AMERICAN November 1993
Copyright 1993 Scientific American, Inc.
SCIENTIFIC AMERICAN ... and
60B SCIENTIFIC AMERICAN November 1993
Copyright 1993 Scientific American, Inc.
there is another explanation as well.
In 1982 my colleague Thierry Heid-
mann and I further proposed that the
ability ... better oÝ having their own
symphony orchestras and other cultural oÝerings, they should
also keep their vital industries local.
Copyright 1993 Scientific American, Inc.
74 SCIENTIFIC AMERICAN November...
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scientific american - 1994 03 - visiting yourself in the past
Ngày tải lên :
12/05/2014, 14:54
... im-
Copyright 1994 Scientific American, Inc.Copyright 1994 Scientific American, Inc.Copyright 1994 Scientific American, Inc.Copyright 1994 Scientific American, Inc.
32 SCIENTIFIC AMERICAN March 1994
C
lad ... occurs, the unchanged seg-
ments of the cloned gene, together with
the neo
r
gene sandwiched between
them, replace the target sequence in
the chromosome. But the tk gene, lying
outside the zone ... measure of the perfor-
mance of a bipolar transistor is the
manner in which the gain of the tran-
sistor (the ratio of the current switched
by the transistor to the current needed
to turn the transistor...
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scientific american - 1994 04 - the dilemmas of prostate cancer
Ngày tải lên :
12/05/2014, 14:54
... oÛce.
The scrawny little specimens scurrying
across the surface of the spongelike
nest are the workers; the soldiers lurk
within. Wilson pulls a plug from the
top of the nest and blows into the ... lauded The Diversity of Life as Òa
38 SCIENTIFIC AMERICAN April 1994
Copyright 1994 Scientific American, Inc.Copyright 1994 Scientific American, Inc.
more lethal diseases do, even though
they aÝect ... from the uterine lin-
ing proliferates in other areas of the
body, such as the bladder, intestine or,
in rare cases, the lung. How these cells
reach the distant organs remains un-
known. One theory...
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scientific american - 1994 06 - was there a race to the moon
Ngày tải lên :
12/05/2014, 14:56
... that Òdepending upon their view of
the Apollo timetable, the Soviets may
feel that there is some prospect of their
getting to the moon Þrst, and they may
press their program in the hopes of be-
ing ... by then they knew
that the U.S. intended to send humans
into orbit around the moon later that
month. This launch presented the Sovi-
ets with perhaps their Þnal opportuni-
ty to beat the Americans ... American presence on the
moon, the U.S. lunar program
also soon wound down. The sixth and
last Apollo landing mission left the
moon in December 1972. By then the
lunar eÝort had clearly met the...
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scientific american - 1994 10 - special issue - life in the universe
Ngày tải lên :
12/05/2014, 14:58
... accretion of
the earth culminated in the diÝerentia-
tion of the planet: the creation of the
core the source of the earthÕs magnet-
ic ÞeldÑand the beginning of the at-
mosphere. In 1953 the classic ... hypoth-
eses meet the test of observation and
experiment.
SCIENTIFIC AMERICAN October 1994 57
FURTHER READING
LONELY HEARTS OF THE COSMOS: THE
SCIENTIFIC QUEST FOR THE SECRET OF
THE UNIVERSE. Dennis ... re-
turned the elements to the space be-
tween the stars. There gravitation mold-
ed them into new stars and planets, and
electromagnetism cast them into the
chemicals of life. The ink on this page,
the...
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scientific american - 1994 12 - nasa's latest view of the earth
Ngày tải lên :
12/05/2014, 14:59
... nerves. The CT images con-
Þrm an earlier hypotheses by Kielan-Ja-
worowska: the carotid arteries, the main
channels supplying blood to the brain
and the eye, enter the skull along the
midline rather ... of the Flaming
Copyright 1994 Scientific American, Inc.
SCIENTIFIC AMERICAN December 1994 73
LOST CITY OF UBAR in southern Oman
was uncovered in 1992 using LANDSAT.
As in the original data, the ... helix. The other
oligonucleotide winds around the deep major groove of the DNA double helix, pro-
ducing a triple helix (bottom). The nucleotides (identiÞed by the Þrst letter of their
bases) in the...
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