types of electrical measuring instruments ppt
Tài liệu Principles And Applications Of Electrical Engineering P2 ppt
Ngày tải lên :
19/01/2014, 20:20
... 31
the electrical properties of the material. Resistance to the flow of current may
be undesired—for example, in the case of lead wires and connection cable—or it
may be exploited in an electrical ... because of its simplicity. It is, however, only an approx-
imation of the physics of electrically conducting materials. Typically, the linear
relationship between voltage and current in electrical ... for example, in
three of the four quadrants of the i-v characteristic and can therefore act as sources
of energy for specific combinations of voltages and currents. An example of this
dual behavior...
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Tài liệu Types of Atomic & Molecular Bonds pptx
Ngày tải lên :
15/02/2014, 13:20
... Types of Atomic & Molecular
Bonds
Types of Atomic & Molecular
Bonds
Objectives of the class
Develop a sense of history of scientific thinking
Explain the types of bonds
You ... Energy vs. Separation DistanceEnergy vs. Separation Distance
a
F
E
Types of Atomic &
Molecular Bonds
Types of Atomic &
Molecular Bonds
Force vs. Separation DistanceForce vs. ... (400 BC)
Lots of work done by the alchemists
Lavoisier: chemical reaction leads to no net
loss or gain of matter.
Dalton: concept of atomic mass (1808)
Mendelev: periodic table of elements (1869)
Moseley:...
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Tài liệu Types of pacemakers and the hemodynamics of pacing pptx
Ngày tải lên :
24/01/2014, 01:20
... !"#"!
5 Types of Pacemakers and the Hemodynamics of Pacing
Permanent Pacemaker Types
Pacemaker Code
""$...
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Tài liệu Semiconductor MaterialsS. K. Tewksbury Microelectronic Systems Research Center Dept. of Electrical ppt
Ngày tải lên :
25/01/2014, 15:20
... condi-
tions), knowledge of the density of one of the carrier types (e.g., of p) allows direct deter-
mination of the density of the other (e.g., n = n
2
i
/p). Values of n
i
vary considerably ... semiconductor
crystals, the density of such scattering sites is small relative to the density of silicon atoms.
As a result, removal of the silicon atoms through use of the effective mass leaves a somewhat
sparsely ... overview of many of the semiconductor materials in use. To
organize the information, the topic is developed from the perspective of the factors contribut-
ing to the electronic behavior of devices...
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Tài liệu Handbook of Electrical Design Details P2 pptx
Ngày tải lên :
25/01/2014, 23:20
... manufacture of electrical
equipment, the job site, and the installation of electrical systems. Many of these stan-
dards are focused on safety issues, such as the elimination or avoidance of hazards ... owner. Electrical specifications and electrical drawings are integral parts of
the contract requirements for the performance of electrical work.
Because specifications are a significant part of a ... drawing of a section through the wall of an office warehouse. It provides details
of how and where hanger fittings and boxes are to be placed between a column and
insulation to support a run of bus...
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Tài liệu Types of Storage Devices ppt
Ngày tải lên :
16/02/2014, 08:20
... disks store large amounts of data. New PCs
feature hard disks with capacities of 10 GB and
higher.
lesson 9 Review
ã
List four types of magnetic and four types of optical
storage devices.
ã
Identify ... single speed, and
read data at a rate of 150 KBps. (Hard disks transfer
data at rates of 5 15 MBps).
ã
CD-ROM drives now can transfer data at speeds of
up to 7800 KBps. Data transfer speeds ... be polarized—given a magnetic chargein
one of two directions.
ã
Each particle's direction represents a 1 (on) or 0 (off),
representing each bit of data that the CPU can
recognize.
ã
A disk...
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Tài liệu Báo cáo khoa học: "Types of Common-Sense Knowledge Needed for Recognizing Textual Entailment" ppt
Ngày tải lên :
20/02/2014, 05:20
... our
set of categories. Further surveys would be required
to validate this idea.
The 20 categories of knowledge covered 215
(97%) of the 221 statements of world knowledge
in our proofs. Of the ... then x is of type ‘person’.” Stated
in this way, these kinds of knowledge look quite dif-
ferent. If one reads our proofs from start to finish,
the flow of the argument indicates which of these
forms ... (condensed)
proof. Each line in the proof indicates either a new
piece of background knowledge brought to bear, or
a modus ponens inference from the information in
the text or previous lines of the proof....
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Tài liệu Measuring the Socio‐economic Status of Higher Education Students ppt
Ngày tải lên :
20/02/2014, 20:20
... of thesedimensions of SEScouldbeused tomeasure
theSES of highereducationstudents.
4.1 Education
The education dimension of SES is usually measured throu gh the level of ... measure of SES provides an indication of the level of disadvantage in a
student’scommunity. Whilethismay beconsideredanimportantelement of SES, itisonly
oneaspect of anindividual’scircumstancesanditisimportantthatmeasures of SESreflecta
range of dimensionswhich ... 2008enrolment
data.
Thesecondmeasurebeinginvestigatedistheoutcome of ajointcommittee of DEEWR,ABS
and Universities Australia.This committee noted that there was support for the use of
parents’educationalattainmentaspart of ameasure of students’SES(UniversitiesAustralia,
2008)....
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Practical Troubleshooting of Electrical Equipment and Control Circuits pptx
Ngày tải lên :
07/03/2014, 08:20
... (alternating current)
ã DC (direct current).
Electrical equipments can run on either of the AC/DC forms of electrical energies. The
selection of energy source for equipment depends on its application ...
Motor
Gen
NNSS
Generator
Motor
(a)
(b)
SS
N
N
N
Figure 1.11
Typical cross section and development of an electrical machine
1.2.6 Basic principles of electrical machines
In an electrical machine, the currents in all the windings combine ... N
1
= Number of turns in primary
N
2
= Number of turns in secondary
m
φ
= Maximum flux in core and
f = Frequency of AC input in Hz.
20 Practical Troubleshooting of Electrical Equipment...
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Báo cáo khoa học: Two types of replication protein A in seed plants Characterization of their functions in vitro and in vivo ppt
Ngày tải lên :
07/03/2014, 21:20
... shown).
Analysis of T-DNA insertion mutants and RNAi
mutants of A. thaliana homologs of OsRPA70a
and OsRPA70b (AtRPA70a and AtRPA70b)
A. thaliana was used for genetic analysis of the functions
of OsRPA70a ... cloned in
Two types of RPA in seed plants T. Ishibashi et al.
3278 FEBS Journal 272 (2005) 32703281 ê 2005 FEBS
Two types of replication protein A in seed plants
Characterization of their functions ... primers were used to
obtain a fragment of 722 bp corresponding to nt 1135–
1857 of the AtRPA70a cDNA (NM_126648), and of
683 bp corresponding to nt 823–1511 of the AtRPA70b
cDNA (NM_120884). The...
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Báo cáo khoa học: "Semantic Types of Some Generic Relation Arguments: Detection and Evaluation" pptx
Ngày tải lên :
08/03/2014, 01:20
... 7 binary
relations from the training set of the SemEval-2007
competition, all definitions of which share the re-
quirement of the syntactic closeness of the argu-
ments. Further, their definitions ... precision compared to the other relation
types while using our approach.
Table 2 contains some examples of the semantic
types we found for each relation. Some of them
are quite specific (e.g., Origin-Entity), ... G
y
i
which are generalization types of the argu-
ments of a given positive example < x
i
, y
i
>. In
other words, we perform generalization per relation
argument in a form of one positive example...
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FUNDAMENTALS OF ELECTRICAL ENGINEERING ppt
Ngày tải lên :
23/03/2014, 08:21
... solve a variety of practical
problems.
Finally, a third objective of the book is to illustrate, by way of concrete, fully worked examples, a number of
relevant applications of electrical engineering ... certain amount of resistance, the magnitude of which depends on
the electrical properties of the material. Resistance to the flow of current may be
undesired—for example, in the case of lead wires ... presence of electronic devices and instrumentation in all aspects of engineering design and
analysis is one of the manifestations of the electronic revolution that has characterized the second half of...
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