This document discusses dielectrics and their properties. It defines dielectrics as materials with high electrical resistivity that can efficiently support electrostatic fields and store charge. The key properties discussed are dielectric constant, which measures a material's ability to concentrate electrostatic lines of flux, and dielectric loss, which is the proportion of energy lost as heat. The document also covers topics like capacitance, polarization in insulators, definitions of permittivity and permeability, and applications of dielectrics like energy storage and photonic crystals.
Dielectric Properties of Insulating Materialsrajendra purkar
Dielectric Properties of Insulating Materials, in Material Science
different material used in Power system as Insulators and their required properties and applications.
Fundamentals of learn how to Semiconductors can easily be mani pulated to become conducting or insulating materials and can change their conductive properties
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Dielectric Properties of Insulating Materialsrajendra purkar
Dielectric Properties of Insulating Materials, in Material Science
different material used in Power system as Insulators and their required properties and applications.
Fundamentals of learn how to Semiconductors can easily be mani pulated to become conducting or insulating materials and can change their conductive properties
FellowBuddy.com is an innovative platform that brings students together to share notes, exam papers, study guides, project reports and presentation for upcoming exams.
We connect Students who have an understanding of course material with Students who need help.
Benefits:-
# Students can catch up on notes they missed because of an absence.
# Underachievers can find peer developed notes that break down lecture and study material in a way that they can understand
# Students can earn better grades, save time and study effectively
Our Vision & Mission – Simplifying Students Life
Our Belief – “The great breakthrough in your life comes when you realize it, that you can learn anything you need to learn; to accomplish any goal that you have set for yourself. This means there are no limits on what you can be, have or do.”
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This presentation is about electromagnetic fields, history of this theory and personalities contributing to this theory. Applications of electromagnetism. Vector Analysis and coordinate systems.
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International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
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The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
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Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
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June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
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This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
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The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
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Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
1. Dielectrics
Prof. V. Krishnakumar
Professor and Head
Department of Physics
Periyar University
Salem – 636 011
2. Introduction
• Dielectric materials: high electrical resistivities, but
an efficient supporter of electrostatic fields.
• Can store energy/charge.
• Able to support an electrostatic field while
dissipating minimal energy in the form of heat.
• The lower the dielectric loss (proportion of energy
lost as heat), the more effective is a dielectric
material.
• Another consideration is the dielectric constant,
the extent to which a substance concentrates the
electrostatic lines of flux.
3. Capacitance
• Two electrodes separated by a gap
define a capacitor.
• When a bias is applied across the
capacitor plates, one charges positively,
the other negatively.
• The amount of charge that the capacitor
can store (Q) is proportional to the bias
(V) times how good the capacitor is, the
‘capacitance’ (C).
• The capacitance is related to the area of
the plates (A), their separation (d), and
the Dielectric Constant (εεo) of the
dielectric between the plates
• Dielectric constant of vacuum; εo =
8.85x10-12 F/m=55.2 Me/(V*m)
d
A
C o
e
o *
V
e
m
m
V
d
A
Q V m
* 2
*
4. Why does charge built up?
There is generally not a built-in electric field between the
plates of an unbiased capacitor.
When an electric field is applied, any charged carriers or
species within the material will respond.
For a conductor or semiconductor, e- will flow to the +
plate, and possibly also holes will flow to the - plate.
Current is carried=no charge buildup.
For an insulator, there aren’t a significant number of free
carriers. There are highly ionic species, however, but they
aren’t very mobile at low temperatures. No appreciable
current is carried=charge buildup.
5. Polarization in Insulators
Positively charged species in insulators shift/rotate/align toward the
negative electrode and negatively charged species shift/rotate/align
towards the positive electrode; creating dipoles. The dipole moment
density is termed the Polarization (P) and has the units of C/m2.
Electron Cloud Electron Cloud
+
+
-
E
Electronic polarization, occurs
in all insulators
-
- -
+ - +
-
+ +
+ +
E
Ionic polarization occurs
in all ionic solids: NaCl,
MgO…
-
-
-
+ +
E
Molecular polarization, occurs
in all insulating molecules;
oils, polymers, H2O…
Electric Dipole Moment
p q x
Polarization
q
A
p
P
V
6. Dielectric Effects
Metal plates
Dielectric
A
d
C
What makes different from 0?
POLARIZATION
1
0
r
r
In electrostatics, the CONSTITUITIVE RELATION is
D E E P
Polarization
P E
0
0
Susceptibility
7. Dielectric Effects
POLARIZATION arises from charge shifts in the material—
there is a macroscopic separation of positive charge (e.g., the
ions) and negative charge (e.g., the BONDING ELECTRONS).
Induced DIPOLE MOMENT
POLARIZATION is then
di q x0
There are many sources of dipoles.
Amount of charge shift
P Ndipolesdi
8. Definitions
•Permittivity is a physical quantity
that describes how an electric field
affects and is affected by a dielectric
medium and is determined by the
ability of a material to polarize in
response to an applied electric field,
and thereby to cancel, partially, the
field inside the material. Permittivity
relates therefore to a material's ability
to transmit (or "permit") an electric
field…The permittivity of a material
is usually given relative to that of
vacuum, as a relative permittivity,
(also called dielectric constant in
some cases)….- Wikipedia
Dk
Df
'
"
r r
9. Permittivity and Permeability Definitions
(Dielectric Constant)
' "
Permittivity
0
r r r j
•interaction of a material in the
presence of an external electric
field.
10. Permittivity and Permeability Definitions
(Dielectric Constant)
' "
Permittivity
0
r r r j
•interaction of a material in the
presence of an external electric
field.
Dk
11. Permittivity and Permeability Definitions
' "
' "
0
r r r j
•interaction of a material in the
presence of an external electric
field.
0
r jr
interaction of a material in the
presence of an external magnetic field.
Permittivity
(Dielectric Constant)
Permeability
Dk
12. Permittivity and Permeability Definitions
' "
' "
0
r r r j
•interaction of a material in the
presence of an external electric
field.
0
r jr
interaction of a material in the
presence of an external magnetic field.
Permittivity
(Dielectric Constant)
Permeability
Dk
13. STORAGE
Electric Magnetic
Fields Fields
Permittivity Permeability
' "
Electromagnetic Field Interaction
MUT
r r jr ' "
r r j r
STORAGE
14. STORAGE
Electric Magnetic
Fields Fields
LOSS
Permittivity Permeability
' "
Electromagnetic Field Interaction
MUT
r r jr ' "
r r j r
STORAGE
LOSS
15. Loss Tangent
"
r
'
tan
r
r
'
r
''
r
Energy Lost perCycle
Energy Stored perCycle
1
D
Q
tan
Dissipation Factor D Quality Factor Q
Df
16. Relaxation Constant t
t = Time required
for 1/e of an aligned
system to return to
equilibrium or
random state, in
seconds.
1 1
c fc
t
2
100
1
1
10
Water at 20o C
10 100
f,
GHz
most energy is lost at 1/t
'
r
"
r
t
j
s
1
Debye equation : ( )
17. Dielectric Effects
s static
optical
0 ln()
P LO
30-50 meV 10-15 eV
visible
infrared
Major source of POLARIZATION
is distortion of the bonding
electrons around atoms. This
leads to the normal
semiconductor dielectric
constant.
In POLAR materials, like
GaAs and SiC, the different
charge on the A and B atoms
can be polarized as well,
leading to a difference
between the optical and the
static dielectric constants.
In Appendix C, the two values for GaAs are reversed!
18.
19.
20. Definition:
A photonic crystal is a periodic arrangement
of a dielectric material
that exhibits strong interaction with light
21.
22.
23. Piezoelectric Effect
In materials with NO REFLECTION SYMMETRY (like GaAs or
many molecular species) the applied electric field produces a
DISTORTION OF THE LATTICE (size change) and vice versa.
FORCE
ELECTRIC FIELD
A common piezoelectric is Poly-Vinylidene Flouride, which is
used in a variety of stereo headsets. The most common is
crystalline quartz used as frequency control crystals—pressure
applied to the quartz has a resonance which can be used in a
feedback loop to create a highly-stable oscillator—the quartz
crystal oscillator.