scientific american - 2002 12 - on thin ice
scientific american - 2002 12 - on thin ice
... Antarctica’s dynamic ice sheet
continued on page 10
SCIENTIFIC AMERICAN
5
COPYRIGHT 2002 SCIENTIFIC AMERICAN, INC.
LAWRENCE LESSIG SAYS
that intellectual-property
rights on the Internet have
been ... Riccardo Giacconi
of Associated Universities, Inc., in Washing-
ton, D.C., laid the foundations of x-ray as-
tronomy in 1959 by developing instruments
to study x-ray sources from s...
scientific american - 1993 12 - taming africanized killer bees
... competition drives
prices down, rising consumer expecta-
tions seem likely to force capital in-
vestment up. In order to entice custom-
ers not reared on the fuzzy, unreliable
connections typical ... practice
contraception employ recently devel-
oped methods. According to the ques-
tionnaires, voluntary female steriliza-
tion is the most common method of
family planning. Sterilization is pr...
scientific american - 1994 12 - nasa's latest view of the earth
... computer
monitors the results and compiles in-
formation on the exact, three-dimen-
sional shape of specimens such as the
skeletal remains of long-dead Native
Americans or fossils of even longer-
dead ... comput-
ers that draw virtual
worlds, three-dimensional
objects are composed of
many two-dimensional polygons. Ex-
perts estimate that each frame of a VR
animation must contain about 80 mi...
scientific american - 1995 12 - the puzzle of consciousness
... gene that caus-
es Lesch-Nyhan syndrome, which often
involves self-mutilation, is one. Anoth-
er is a variant gene for the thyroid hor-
mone receptor, which can lead to at-
tention-deÞcit hyperactivity ... current
location with the U.S. mili-
taryÕs Global Positioning
System, a set of satellites
whose precise signals al-
low more accurate naviga-
tion than the radio bea-
cons used today. That...
scientific american - 1996 12 - traces of the big bang
... Interna-
tional Security in Washington, D.C.
“It’s just a waste of money.”
If built, the so-called National Igni-
tion Facility (NIF) will consist of 192 la-
sers whose light will converge on mi-
nute ... re-
action products.
IN BRIEF
Continued on page 26
RADIATION LEVELS
were measured after a small tank containing radioactive
solution exploded near Tomsk-7 in 1993.
ITAR-TASS/SOVFOTO
TON...
scientific american - 1997 12 - building the biggest
... wheth-
er that is a price it is willing to pay.
—Patrick Joseph in San Francisco
News and Analysis48 Scientific American December 1997
CYBER VIEW
On- line Advertising
Goes One -on- One
DAVID SUTER
12. 97.SCI.CIT.5P.DOM ... But
advertising
—especially one -on- one ad-
vertising
—is showing promise.
“What it boils down to,” says Aptex’s
John Gaffney, “is that to do one-to-one
we have to...
scientific american - 1998 12 - animal or vegetable
... newer prod-
ucts are 5-androstenedione, 4-andro-
stenediol, 5-androstenediol,
1 9-4 -norandrostenedione
and 1 9-5 -norandrostene-
diol. (The Merck Index
classifies 5-androstenediol
and 1 9-5 -norandrostenediol
as ... grandly call it, “speech-
recognition technology.” Dictation pro-
grams rival SaladShooters for the title
of all-time champion in the unwieldy-
solution-to-an-insignificant-p...
scientific american - 1999 12 - what science will know in 2050
... transmits 2.5 gi-
gabits of data in both directions simul-
taneously on one channel; a four-chan-
nel system is slated for next summer.
On the other hand, OpticAir is a line-
of-sight solution, causing ... Astronau-
tics,builder of the
$125 -million or-
biter,had failed to
convert thrust data
from pounds (used
by U.S.aerospace
companies) to its
metric cousin,new-
tons (used by the
Jet Pr...
scientific american - 2000 12 - rulers of the jurassic seas
... to design com-
puters with multiple-issue and out-of-or-
der execution capabilities like those Con-
way had conceived.
After her VLSI work, Conway went on
to spur a similar revolution in artificial
intelligence ... have none), which implied that
their ancestors once lived on land.
Paleontologists drew these conclu-
sions based solely on the exquisite skele-
tons of relatively late, fish-s...
scientific american - 2001 12 - india, pakistan and the bomb
... says.
Lucent has gone on to develop soliton-
transmission systems using dispersion-
managed solitons and expects to an-
nounce new products that use the technol-
ogy in coming months as replacements ... insigni -
cant in comparison to what would be need-
ed to mount a mass attack. During the hey-
day of the American germ weapons pro-
gram, a U.S. Army production facility at
Vigo, Ind....
Từ khóa:
- bài tập toán 12 ôn thi
- lý thuyết lý 12 ôn thi đại học
- bài tập vật lý 12 ôn thi đại học
- các dạng bài tập lý 12 ôn thi đại học
- tổng hợp lý thuyết vật lý 12 ôn thi đại học
- các công thức toán 12 ôn thi tn tsđh
- công thức lý 12 ôn thi đại học
- tổng hợp kiến thức sinh học 12 ôn thi đại học
- sinh học 12 ôn tập phần di truyền học