<s>
Science.gov	B-Application
is	O
a	O
web	O
portal	O
and	O
specialized	B-Library
search	I-Library
engine	I-Library
.	O
</s>
<s>
Using	O
federated	B-Operating_System
search	I-Operating_System
technology	O
,	O
Science.gov	B-Application
serves	O
as	O
a	O
gateway	O
to	O
United	O
States	O
government	O
scientific	O
and	O
technical	O
information	O
and	O
research	O
.	O
</s>
<s>
Currently	O
in	O
its	O
fifth	O
generation	O
,	O
Science.gov	B-Application
provides	O
a	O
search	O
of	O
over	O
60	O
databases	O
from	O
14	O
federal	O
science	O
agencies	O
and	O
200	O
million	O
pages	O
of	O
science	O
information	O
with	O
just	O
one	O
query	O
,	O
and	O
is	O
a	O
gateway	O
to	O
2,200	O
+	O
scientific	O
websites	O
.	O
</s>
<s>
In	O
2007	O
,	O
a	O
report	O
to	O
Congress	O
noted	O
that	O
in	O
fiscal	O
year	O
2007	O
"	O
Science.gov	B-Application
experienced	O
6.5	O
million	O
search	O
queries	O
across	O
all	O
its	O
scientific	O
databases	O
and	O
2.6	O
million	O
page	O
views	O
of	O
its	O
website.	O
"	O
</s>
<s>
In	O
April	O
2007	O
,	O
Library	O
Journal	O
included	O
Science.gov	B-Application
in	O
its	O
list	O
of	O
best	O
references	O
of	O
2006	O
.	O
</s>
<s>
Science.gov	B-Application
is	O
also	O
the	O
United	O
States	O
contribution	O
to	O
the	O
international	O
portal	O
WorldWideScience	B-Application
.	O
</s>
<s>
Science.gov	B-Application
1.0	O
was	O
launched	O
in	O
December	O
2002	O
,	O
providing	O
for	O
the	O
first	O
time	O
wide	O
public	O
access	O
and	O
a	O
unified	O
search	O
of	O
the	O
government	O
's	O
stores	O
of	O
scientific	O
and	O
technical	O
information	O
.	O
</s>
<s>
Science.gov	B-Application
is	O
an	O
interagency	O
initiative	O
of	O
18	O
U.S.	O
government	O
science	O
organizations	O
within	O
14	O
Federal	O
agencies	O
.	O
</s>
<s>
These	O
agencies	O
form	O
the	O
voluntary	O
Science.gov	B-Application
Alliance	O
.	O
</s>
<s>
U.S.	O
Secretary	O
of	O
Energy	O
Spencer	O
Abraham	O
and	O
Director	O
of	O
the	O
Office	O
of	O
Science	O
Dr.	O
Raymond	O
L	O
.	O
Orbach	O
both	O
remarked	O
positively	O
on	O
the	O
launch	O
of	O
Science.gov	B-Application
2.0	O
on	O
May	O
11	O
,	O
2004	O
.	O
</s>
<s>
A	O
free	O
"	O
Alert	O
"	O
service	O
was	O
released	O
in	O
February	O
2005	O
,	O
allowing	O
users	O
to	O
receive	O
e-mail	O
alerts	B-Application
about	O
current	O
science	O
developments	O
in	O
their	O
areas	O
of	O
interest	O
.	O
</s>
<s>
Results	O
are	O
displayed	O
in	O
the	O
Alert	O
email	O
and	O
in	O
a	O
personalized	O
Alert	O
Archive	O
,	O
which	O
stores	O
six	O
weeks	O
of	O
alerts	B-Application
results	O
.	O
</s>
<s>
In	O
February	O
2007	O
,	O
Science.gov	B-Application
4.0	O
was	O
launched	O
.	O
</s>
<s>
The	O
relevancy	O
ranking	B-Application
algorithms	I-Application
became	O
more	O
sophisticated	O
,	O
providing	O
ranking	O
of	O
the	O
entire	O
full	O
text	O
of	O
documents	O
on	O
sites	O
where	O
searchable	B-Application
full	O
text	O
resides	O
.	O
</s>
<s>
A	O
new	O
feature	O
allowed	O
users	O
to	O
share	O
search	B-Application
results	I-Application
via	O
e-mail	O
.	O
</s>
<s>
Science.gov	B-Application
5.0	O
was	O
launched	O
in	O
September	O
2008	O
and	O
announced	O
in	O
a	O
U.S.	O
Department	O
of	O
Energy	O
Press	O
Release	O
.	O
</s>
<s>
Governance	O
of	O
Science.gov	B-Application
is	O
provided	O
by	O
the	O
interagency	O
Science.gov	B-Application
Alliance	O
.	O
</s>
<s>
Science.gov	B-Application
provides	O
science	O
search	O
through	O
a	O
variety	O
of	O
features	O
and	O
capabilities	O
,	O
including	O
:	O
</s>
<s>
Science.gov	B-Application
participates	O
in	O
the	O
WorldWideScience	B-Application
global	O
science	O
gateway	O
.	O
</s>
<s>
The	O
content	O
for	O
Science.gov	B-Application
is	O
contributed	O
by	O
participating	O
agencies	O
including	O
science	O
professionals	O
,	O
students	O
and	O
teachers	O
,	O
and	O
the	O
business	O
community	O
.	O
</s>
<s>
Many	O
of	O
these	O
agencies	O
are	O
members	O
of	O
CENDI	O
,	O
which	O
provides	O
administrative	O
support	O
and	O
coordination	O
for	O
Science.gov	B-Application
.	O
</s>
<s>
Science.gov	B-Application
and	O
the	O
Science.gov	B-Application
Alliance	O
were	O
formed	O
in	O
response	O
to	O
the	O
April	O
2001	O
workshop	O
,	O
"	O
Strengthening	O
the	O
Public	O
Information	O
Infrastructure	O
for	O
Science	O
.	O
</s>
<s>
The	O
Science.gov	B-Application
website	O
is	O
hosted	O
by	O
the	O
U.S.	O
Department	O
of	O
Energy	O
(	O
DOE	O
)	O
Office	O
of	O
Scientific	O
and	O
Technical	O
Information	O
(	O
OSTI	O
)	O
,	O
located	O
in	O
Oak	O
Ridge	O
,	O
Tennessee	O
,	O
which	O
also	O
supplies	O
the	O
site	O
's	O
"	O
deep	O
web	B-Application
search	I-Application
"	O
capability	O
.	O
</s>
