steel material of gas
thermal treatment effects on the material and gas-sensing properties of room-temperaturetungstenoxidenanorodsensors
Ngày tải lên :
20/03/2014, 13:11
... on the material and gas- sensing properties of
room-temperature tungsten oxide nanorod sensors
Yong Shin Kim
∗
Department of Applied Chemistry, Hanyang University, Ansan 426-791, Republic of Korea
article ... dependence of their material and gas- sensing
properties on thermal treatment conditions. The thermal treat-
ments were performed with the variation of annealing temperature
in the range of 200–700
◦
C ... times with a slight sacrifice of response. This behavior
might be explained in the light of the observed material character-
istics as stated below. The material properties of N
2
-annealed films
at...
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Tài liệu Chapter XIV Kinetic-molecular theory of gases – Distribution function doc
Ngày tải lên :
17/01/2014, 04:20
... amount of gas ?
kTk
tr
2
3
Now we consider an ideal gas in aspects of energy
3.1 Internal energy of ideal gas:
The kinetic-molecular model states that
The internal energy of an ideal gas is of ... expressions for the inertial energy of
1 mole of ideal gas:
For n moles of gas the internal energy is by n times larger !
4/22/2008 35
Summary
Equation of state of an ideal gas
nRTpV
The kinetic-molecular ... average"
One of the keys of the kinetic-molecular model is to relate pressure
to collisions of molecules with any wall:
4/22/2008 4
§1. Kinetic–molecular model of an ideal gas:
1.1 Equations of state of...
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Tài liệu Tolley’s Basic Science and Practice of Gas Service Gas Service Technology Volume 1 docx
Ngày tải lên :
16/02/2014, 07:20
... m
3
of oxygen required to burn 1 m
3
of natural gas, we
needed 9.8 m
3
of air. The difference, 9.8 – 2.06 ¼ 7.74 m
3
, is nitrogen. So, when
1m
3
of natural gas is burned, the total volume of gases ... gravity of natural gas is in the region of 0.5. So it is about half
the weight of the same volume of air. The specific gravity of liquefied petroleum
gas (LPG) is greater than that of air.
WOBBE NUMBER
The ... practice of gas service. – 5th ed.
1. Gas appliances–Installation. 2. Gas appliances–Maintenance and repair.
I. Title II. Basic science and practice of gas service 683.8
0
8-dc22
Library of Congress...
- 481
- 2K
- 0
Tài liệu Báo cáo khoa học: MicroRNA-23a promotes the growth of gastric adenocarcinoma cell line MGC803 and downregulates interleukin-6 receptor pdf
Ngày tải lên :
18/02/2014, 04:20
... promotes the growth of the gastric adeno-
carcinoma cell line MGC803, providing the first proof-
of- concept that there is a potential link between the
tumor promoter miR-23a and gastric adenocarcinoma
cell ... upregulated
expression of miR-23a causes the downregulation of
IL6R by binding to its first conserved binding site,
which then leads to the development of gastric adeno-
carcinoma.
Materials and methods
Human ... detect
the miRNA profiles in four pairs of gastric adenocarci-
noma tissue samples and matched normal gastric tissue
samples. miR-23a was consistently upregulated in gas-
tric adenocarcinoma tissues...
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- 541
- 0
Tài liệu Báo cáo khoa học: Identification of GAS-dependent interferon-sensitive target genes whose transcription is STAT2-dependent but ISGF3-independent doc
Ngày tải lên :
19/02/2014, 07:20
... sequence (GAS) -like ele-
ments in their 5¢ flanking sequences. Our data reveal the existence of a
collection of GAS- regulated target genes whose expression is IFN-inducible
and independent of ISGF3 ... analysis of the contribution of the
STAT2 DNA binding domain to IFN responses on a global basis, and
shows that STAT2 is required for the IFN-inducible activation of the full
spectrum of GAS target ... number of genes in U6A
and U6A-2 cells, IFN-treated U6A-VV-II cells showed
the down-regulation of a substantially larger subset of
genes.
Identification and characterization of a subset of
ISGF3-independent...
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Theory of Gas Injection Processes Franklin M. Orr, Jr. Stanford University Stanford ppt
Ngày tải lên :
05/03/2014, 18:20
... (t), of the porous medium bounded by a surface, S(t). A material
balance on component i in the control volume can be stated as
Rate of change of
amount of compo-
nent i in V (t)
=
Net rate of in-
flow ... partial fugacity of each component in each phase
from a description of the volumetric behavior of the mixture.
3.2 Calculation of Partial Fugacity
Equations of state in common use for gas/ oil systems ... in-
flow of component
i into V (t) due to
flow of phases
+
Net rate of in-
flow of component
i into V (t) due
to hydrodynamic
dispersion
5
3.1. THERMODYNAMIC BACKGROUND 25
The chemical potential is of...
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American College of Gastroenterology Guidelines for Colorectal Cancer Screening 2008 pdf
Ngày tải lên :
15/03/2014, 01:20
... (1).
The American Journal of GASTROENTEROLOGY www.amjgastro.com
The American Journal of GASTROENTEROLOGY www.amjgastro.com
10
Rex et al .
e rationale and importance of the continuous quality ... Journal of GASTROENTEROLOGY www.amjgastro.com
6
Rex et al .
4 9 . A n d e r s o n J C , A t t a m R , A l p e r n Z et al. P r e v a l e n ce of colorectal neoplasia in
smokers . Am J Gastroenterol ...
certain principles of preparation will enhance the e ectiveness
of each of these commercial preparations. Best established is
the principle of “ splitting, ” in which at least half of the prepara-
tion...
- 12
- 490
- 0
Will silicon be the photonic material of the third millenium
Ngày tải lên :
16/03/2014, 15:32
... example of the complexity of the metal interconnects in today’s chip. Left chip
cross-section: most of the chip is occupied by metalinterconnect layers. Right: the complexity of
the architecture of ... typical bit rate of 155 Mb s
−1
[24]. A further advantage of the use
of a large optical mode waveguide is the ease of interfacing to single-mode optical fibre. In
the approach of [24], these are ... masses of the charge
carriers, limited band offset of approximately 80 meV per 10% Ge concentration and splitting
into heavy hole (HH) and light hole (LH) bands. Moreover, the high amount of strain,...
- 28
- 276
- 0
Fundamentals of gas dynamics, 2e r zucker, o biblarz
Ngày tải lên :
17/03/2014, 14:01
... form of the continuity equation in several future
derivations.
2.6 CONSERVATION OF ENERGY
The first law of thermodynamics is a statement of conservation of energy. For a system
composed of a given ... TRANSFORMATION OF A MATERIAL DERIVATIVE TO A CONTROL VOLUME APPROACH 29
We construct our material derivative from the mathematical definition
dN
dt
≡ lim
t→0
(final value of N)
t+t
− (initial value of ... form of partial derivatives) the specific heats c
v
and c
p
. Are these
expressions valid for a material in any state?
1.28. State the perfect gas equation of state. Give a consistent set of units...
- 500
- 319
- 0
The properties of gases and liquids, fifth edition poling, prausnitz, o’connell
Ngày tải lên :
17/03/2014, 14:01
... pair of [ ]CH— &[ ]CϽ, 1 pair of CH— &F—, 1 pair of
ϭϭ ϭ
CϽ & —F, 1 pair of CϽ and ϾCϽ, and 3 pairs of ϾCϽ & —F. The location
ϭϭ
of bonding in esters is distinguished by the use of ... For-
tunately, the result is often adequate for engineering purposes, in spite of the large
measure of empiricism incorporated in so many of the estimation procedures and
in spite of the potential for ... oxygen as an ideal
gas, carbon as a solid in the form of

-graphite, bromine as a pure saturated liquid,
etc. Numerical values of properties of the constituent elements are not of concern,
since,...
- 707
- 528
- 0
new perspectives of gas sensor technology
Ngày tải lên :
20/03/2014, 13:05
... processing of materials
toward innovations of gas sensors.
Micro-platforms fabricated with MEMS techniques are almost
ready to be used in gas sensors. Excellent heating and cooling char-
acteristics of ... grains. The ratio of the slopes of straight
lines, A/B, gives the ratio of reaction rate constants (k
2
)ofH
2
and
CO; k
2
of H
2
is analyzed to be 14 times as large as that of CO. Sim-
ilar H
2
response ... the field
of gas sensors, especially for the purpose of realizing a micro-
platform, suspended in a cavity of silicon for thermal insulation, on
which sensing materials are coated. One of the greatest...
- 8
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- 0
xps studies of active elements surface of gas sensors based on wo3nanoparticles
Ngày tải lên :
20/03/2014, 13:12
... synthesized by method of electrical explosion of wires. The structure of core levels W4f and O1s
was explored by XPS-method. Exposure of oxides to air at 293 K leads to the formation of WO
3
·(OH
2
)
n
-phase ... surface of nanoparticles.
A correlation between value x of nonstoichiometric WO
3−x
oxide matrix and contents of OH-groups in it was revealed. It was noticed, that the
increase of number of W
5+
-states ... promis-
ing materials and are used for producing of gas sensors active
elements [1–8]. In the most cases the range of their work temper-
atures is 520–620 K. But during exploitation of active elements
at...
- 4
- 560
- 1
DIRECT NUMERICAL SIMULATIONS OF GAS–LIQUID MULTIPHASE FLOWS pot
Ngày tải lên :
28/03/2014, 09:20
... non-oscillating) scheme of Shu
and Osher (1989) has been used by a number of authors. In this scheme the edge
72 Numerical solutions of Navier–Stokes equations
Fig. 3.8. One example of the use of adaptive ... refinement of the grid. Early examples of the use of oc-
tree/quadtree AMR include front-tracking simulations of biological cells by Agre-
sar et al. (1998). More recent uses include simulations of underwater ... Computation of a splashing drop using an advanced VOF method. Reprinted
from Rieber and Frohn (1999) with permission from Elsevier.
development of the VOF method was to get away from using any kind of...
- 337
- 660
- 2
TOLLEY’S BASIC SCIENCE AND PRACTICE OF GAS SERVICE Volume 1 pptx
Ngày tải lên :
29/03/2014, 08:20
... characteristics of the fuel and the way it burns.
Table 1.4 below provides the comparison of properties of typical
gases.
TABLE 1.4 Comparison of properties of typical gases
Property Units
Natural
gas
Commercial
Propane ... AND PRACTICE OF GAS SERVICE
Substitute Natural Gas
Substitute natural gas (SNG) is manufactured either as a direct substi-
tute for natural gas or as a means of providing additional gas to meet
peak ... each 1m
3
of methane requires 2 m
3
of oxygen and produces
1m
3
of carbon dioxide and 2m
3
of water vapour. Therefore, 90m
3
of
methane will require 180 m
3
of oxygen and produce 90 m
3
of carbon
dioxide...
- 533
- 397
- 1
The Pathogenesis of Gastrointestinal Bacterial Overgrowth pptx
Ngày tải lên :
29/03/2014, 13:20
... [55].
Intestinal Microflora in Patients with Gastric
Hypochlorhydria
Cregan et al. [93] showed that neither gastric hypo-
chlorhydria nor the presence of a profuse gastric microflo-
ra necessarily ... specifically.
Overall, only a handful of adverse events were recorded:
5 cases of flatulence, 2 of abdominal pain, 1 of nausea and
2 cases of vomiting in children. Overall, gastrointestinal
side effects ... inhibitors of gastric
acid secretion, resulting in an increase of gastric pH that
interferes significantly with the gastric acid barrier. It is
now well established that H. pylori is of major importance
for...
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