the evolution of communication through history
Tài liệu The Evolution of Internet Telephony pptx
Ngày tải lên :
20/12/2013, 17:15
... network. The function of these
gateways is to packetize the voice signal on the originating end of a call so that it can be
transported over an IP network. At the terminating end of the call, another ... drive the IPT market in the
longer run. Indeed the very future of IPT depends in part on the development of compelling
applications. There are a variety of potential applications, many of which ... growing market
we often find that it changes month by month. All four of these are, however, carrying millions
of minutes each of IPT on their networks. Despite the entry of other players, Delta...
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Tài liệu To improve the health of women through the establishment of Offices of Women’s Health within the Department of Health and Human Services pdf
Ngày tải lên :
13/02/2014, 07:20
... C
OMPOSITION
. The Coordinating Com-17
mittee shall be composed of the directors of the cen-18
ters of the Administration. 19
‘‘(3) C
HAIRPERSON
. The Director of the Of- 20
fice shall serve as the Chairperson ... E
STABLISHMENT
. The Secretary shall estab-10
lish within the Office of the Administrator of the Health 11
Resources and Services Administration, an office to be 12
known as the Office of Women’s Health. The ...
H. R. 1072
To improve the health of women through the establishment of Offices of
Women’s Health within the Department of Health and Human Services.
IN THE HOUSE OF REPRESENTATIVES
F
EBRUARY
15,...
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Tài liệu Combat Pair - The Evolution of Air Force-Navy Integration in Strike Warfare ppt
Ngày tải lên :
17/02/2014, 23:20
... From the Sea: Preparing the Naval Service for
the 21st Century, Washington, D.C.: Department of the Navy, 1992.
22 Combat Pair: The Evolution of Air Force–Navy Integration in Strike Warfare
there ... and line aircrews over the issue of whether fleet squadrons should
train simply to meet the demands of the most likely threat or instead
should train to the limits of their aircraft’s capabilities ... a decade earlier at
the instigation of then-Secretary of the Navy John Lehman in response
to the flawed Navy performance in the Lebanon strike of December
1983 and to the fleet readiness deficiencies...
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Tài liệu Báo cáo khoa học: An intermediate step in the evolution of ATPases – a hybrid F0–V0 rotor in a bacterial Na+ F1F0 ATP synthase pdf
Ngày tải lên :
18/02/2014, 17:20
... two
of the rings face in the opposite direction in the
membrane to the other two, forming the same pattern
as in the AFM surface representation of Fig. 2A. By
comparison with the 3D structure of ... that the c rings
contain both types of c subunits. The stoichiometry for c
2
⁄ c
3
: c
1
was
9 : 1. Furthermore, this stoichiometry was independent of the carbon
source of the growth medium. These ... the ring. The c ring of I. tartaricus has
11 negative charges that are equally distributed along
the horizontal axis of the rotor [8]. A positive charge
on the stator attracts one of the negative...
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Tài liệu FINANCIAL ENGINEERING The Evolution of a Profession pptx
Ngày tải lên :
18/02/2014, 18:20
... 1998. All of these events raised fears of a global economic
meltdown. Also notable at the end of 1998 was the creation of the financial behe-
moth, Citigroup, that challenged the separation of banking ... point in the history of financial engineering came
with three financial calamities: the Asian financial crisis of 1997–1998, followed
by the Russian financial crisis, followed by the downfall of Long-Term ... experience drawn from the publication of numerous past books and articles
on many of these topics. His input was invaluable to the completion of this book.
The authors also wish to thank the staff at...
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Tài liệu Constraining Hypotheses on the Evolution of Art and Aesthetic Appreciation* doc
Ngày tải lên :
19/02/2014, 17:20
... knowledge about their evolution is
basic to understand the evolution of aesthetic preference itself.
A comprehensive understanding of the evolution of the human brain, as well as of
certain specific ... Ardipithecus ramidus. Given the fragmentary state of
these remains, and the difficulties inherent in their comparison, there is much
discussion as to the validity of their hominid status. The earliest ... there is no way of determining which level of analysis is
the most relevant to the study of the neural correlates of aesthetic preference.
Additionally, the evolutionary emergence of such a capacity...
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Tài liệu Báo cáo khoa học: cN-crystallin and the evolution of the bc-crystallin superfamily in vertebrates pdf
Ngày tải lên :
19/02/2014, 17:20
... with the familiar pattern of expression of
the principally embryonic cA–F genes in the rodent
lens [41,47]. The absence of expression in outer layers
of the lens contrasts with the expression of ... evolutionary history
of b and c crystallins is part of the remarkably varied
history of molecular modification of the lens in ter-
restrial vertebrates through the direct gene recruit-
ment of existing ... encodes
the first two structural motifs, and hence the N-ter-
minal domain of the protein, just as in the genes for
cS and cA–F. However, the second half of the gene
has the structure of a b-crystallin...
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THE EVOLUTION OF THE RUSSIAN SAVING BANK SECTOR DURING THE TRANSITION ERA docx
Ngày tải lên :
06/03/2014, 10:20
... on A). There is no significant effect of the
age of the firm. It is clear that the size of the firm in total assets is the key determinant of the
amount of advertising. Large firms have the financial ... 0.103 0.092
Note: The table shows the mean, standard deviation and the coefficient of variation (CV) of the deposit
interest rates. The coefficient of variation (CV) is the ratio of the standard deviation ... present the estimation
results both for the case when there is a lagged dependent variable in the marketing effort
9
depending upon the extent of the persistence of market shares. The sum of the...
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RECREATING NEWTON: NEWTONIAN BIOGRAPHY AND THE MAKING OF NINETEENTH-CENTURY HISTORY OF SCIENCE ppt
Ngày tải lên :
07/03/2014, 02:20
... book highlights the themes of the use of Newton’s reputation in support
of various interests within the scienti c community, the increasing use of his
archives and the role of political and ... the impression
of actual contact with the elderly sage.
is interest in the manuscript record of Newton gathered pace through
the nineteenth century. Biographers of Newton were to add to these ... cases the loyalties of the author might be to the development of that
eld rather than to the promotion of a particular view of contemporary science
and its practitioners. Although there was...
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Báo cáo khoa học: Analysis of the NADH-dependent retinaldehyde reductase activity of amphioxus retinol dehydrogenase enzymes enhances our understanding of the evolution of the retinol dehydrogenase family pot
Ngày tải lên :
07/03/2014, 09:20
... FEBS
To analyze the contribution of protein domains to
the ER anchorage, the localization of the full-length
enzyme was compared with those of five truncated
forms. The pattern of the full-length ... enzymes.
The most significant difference between the amphi-
oxus and the other retinal reductases was, nevertheless,
their preference for the NADH cofactor. To our
knowledge, these are the first ... [29]. The overall analysis, examining
the topology of the phylogenetic tree and the position
of each gene inside the cluster, was informative regard-
ing the orthology relationships of the distinct...
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Báo cáo khoa học: Investigation of the contribution of histidine 119 to the conduction of protons through human Nox2 pptx
Ngày tải lên :
07/03/2014, 16:20
... viral particle and
release of its genome into the cell [18,23]. Therefore, the
influx of protons through the M2 protein is important in
the life cycle of the virus. The M2 protein has a histidine
residue, ... 119.
The contribution of His119 and/or His111 to the
conduction of protons through Nox2 has not previously
been investigated. To determine whether the mechanism for
the conduction of protons through ... and 119. The model of this region as an
a-h elix places Trp125 two turns of the helix above His119
and not on the same face o f the helix. Therefore, the
distance and the orientation of His119...
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The Evolution of Modern Medicine pot
Ngày tải lên :
08/03/2014, 14:20
... obstruction of the bowels the opening of
the abdomen, removal of the obstructed portion and uniting the ends of the intestine by sutures.
After the death of Alexander, Egypt fell into the hands of his ... from the city, then he sketches the career
of some of the more famous of the physicians under the Empire, some of whom must have had incomes never
approached at any other period in the history of ... dogmas
into the language of Greek thought and finally crystallized them in the philosophy of Aristotle."
Whether a plaything of the gods or a cog in the wheels of the universe this was the problem...
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Oxygen and the Evolution of Life pptx
Ngày tải lên :
14/03/2014, 10:20
... structure of the oxygen atom. As we shall
see in Cha p. 2, the existence of oxygen atoms is in turn a necessary result of the
evolution of the universe.
1.3 The Dioxygen Molecule
Virtually all of the ... H
ỵ
ẵ:
Thus, the higher the pH value, the lower the proton concentration and therefore the
degree of dissociation of water. This behavior of water depends strongly on the
temperature, the higher the temperature ... of a
particular part of the DNA from the cell nucleus to the cytosol. This serves as a
matrix for the synthesis of proteins, composed of amino acids. Thus, proteins
express the potential of the...
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The evolution of host use and unusual reproductive strategies in Achrysocharoides parasitoid wasps pot
Ngày tải lên :
14/03/2014, 16:20
... ancestral host of Achryso-
chroides. Regarding the effect of taxa sampling on the
reconstruction of reproductive strategies, although the
biology of most species in other parts of the world is ... comprise a third of known species
of this genus. Regarding the effect of taxa sampling on
the reconstruction of ancestral host use, most of our
species are European, reflecting the most detailed ... causes.
Second, we examine the evolution of host choice.
Recently a phylogeny was constructed of the genus Phyl-
lonorycter that includes all the (British) hosts of the Achrys-
ocharoides included...
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The Evolution of Cells potx
Ngày tải lên :
14/03/2014, 21:20
... of the universe and whether other life
may exist there. If we look through a microscope at a drop of pond water,
we are amazed at the variety of tiny creatures we see.
Since cells form the ... time, the amount of oxygen in the
atmosphere underwent a rapid buildup. That availability of oxygen in
the oceans and atmosphere played a key role in the further develop-
ment of life forms. The ... Microorganisms present in the air could fall into the straight-
neck fl ask but not into the fl ask with the curved neck. At the end of the
experiment, the broth in the straight-neck fl ask was...
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