1. Nuclear reactions occur when fast-moving particles bombard target nuclei, changing the identity or characteristics of the particles. The first nuclear reaction was studied by Rutherford in 1919 using alpha particles on nitrogen.
2. There are several types of nuclear reactions, including elastic scattering, inelastic scattering, radiative capture, and disintegration. Conservation laws like conservation of mass number, charge, mass-energy, and momentum must be obeyed.
3. The Q-value represents the total energy released or absorbed in a nuclear reaction. Exothermic reactions have positive Q-values and release energy, while endothermic reactions have negative Q-values and require energy input.
Crystal Material, Non-Crystalline Material, Crystal Structure, Space Lattice, Unit Cell, Crystal Systems, and Bravais Lattices, Simple Cubic Lattice, Body-Centered Cubic Structure, Face centered cubic structure, No of Atoms per Unit Cell, Atomic Radius, Atomic Packing Factor, Coordination Number, Crystal Defects, Point Defects, Line Defects, Planar Defects, Volume Defects.
Crystal Material, Non-Crystalline Material, Crystal Structure, Space Lattice, Unit Cell, Crystal Systems, and Bravais Lattices, Simple Cubic Lattice, Body-Centered Cubic Structure, Face centered cubic structure, No of Atoms per Unit Cell, Atomic Radius, Atomic Packing Factor, Coordination Number, Crystal Defects, Point Defects, Line Defects, Planar Defects, Volume Defects.
A presentation on Photoacoustic Spectroscopy by Deepak Rajput, UT Space Institute, TN, USA.
This presentation was made as a course requirement at the University of Tennessee Space Institute at Tullahoma.
A presentation on Photoacoustic Spectroscopy by Deepak Rajput, UT Space Institute, TN, USA.
This presentation was made as a course requirement at the University of Tennessee Space Institute at Tullahoma.
PPTs deals with UNIT 3 of power Plant Engg. Nuclear Power Plants. Basics of Nuclear Engg,. Nuclear fusion , Nuclear Fission, half life , finger prints, Types of Nuclear Reactors, basis of types of Nuclear Reactors, working of Boiler water Reactors, Pressurised water reactor,CANDU Reactor
PPTs cover the portion of Unit 3 of the subject code ME 6701, Power Plant Engineering.
PPTs cover basics of Nuclear Engineering, Nuclear Fission & nuclear Fusion, Nuclear decay, Half life, Types of reactors
Methods of collection of Nuclear wastes, types of nuclear wastes ans disposal of nuclear wastes.
A session about nuclear engineering, made for public to increase the public awareness about nuclear energy, radiation, nuclear waste, and nuclear accidents
Nuclear physics is a branch of physics that focuses on the study of atomic nuclei and their interactions. It explores the properties and behavior of atomic nuclei, which are the central cores of atoms containing protons and neutrons. This field is crucial for understanding the fundamental forces that govern the behavior of matter at the atomic and subatomic levels.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
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.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
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.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
2. Nuclear Reaction
• When a target nucleus is bombarded with fast
moving particles , the resulting interaction ,in
which the identity or characteristics of
incident particles are changed is known as
nuclear reaction.
• The simple nuclear reaction can be written as
a + X → Y + b
Incident target product product
Particle Nucleus Nucleus particle
3. • The first nuclear reaction was studied by
Rutherfort in 1919 . He bombarded nitrogen
nuclei i.e. target with 𝛼 – particles and
showed that protons were given out
• 7
14
𝑁 + 2
4
𝐻𝑒 → 8
17
𝑂 + 1
1
𝐻 + Energy
4. Types of nuclear reaction
• Elastic scattering- in this case , the incident
particle strikes the target nucleus and leaves
without loss of energy , but with altered
direction of motion . In an elastic scattering ,
target nucleus remains unaffected
Ex-The large angle scattering of 𝛼 – particles
from thin gold foil .
2
4
𝐻𝑒 + 79
197
𝐴𝑢 → 79
197
𝐴𝑢+ 2
4
𝐻𝑒
5. • Inelastic scattering- In this case , the kinetic
energy is not conserved . But a part of energy
of incident particle is taken up by the target
nucleus which is excited to a higher quantum
state, later on it decay to ground state
radiating the excess energy in the form of 𝛾 –
radiation.
6. • Radiative Capture-in this case , the incident
particle is captured by the target nucleus and
a new nucleus is formed . In general , the new
nucleus has a considerable excess of energy
and decays with the emission of one or more
𝛾 – ray photons.
• Disintegration- In this type of reaction , the
incident particle is absorbed by the target
nucleus and a different type of particles are
emitted . The composition of the resultant
nucleus is also different from the parent
nucleus .
7. Conservation laws
• Conservation of mass numbers-
The total mass number or total number of
nucleons before and after the reaction remains
the same.
• Conservation of charges-
The total charge before and after the reaction
must be conserved.
8. • Conservation of mass and energy-
The total mass – energy in a nuclear reaction
remain unchanged. It means that in a nuclear
reaction , neither kinetic energy nor rest mass is
conserved by itself but their total is always
conserved.
• Conservation of linear momentum-
The total linear momentum of the particles
taking part in a nuclear reaction must be same
before and after nuclear reaction.
9. Q- Value of Nuclear Reaction
• The total energy released or absorbed in the
nuclear reaction.
• It is equal to change in total kinetic energy of
the system. It may be positive or negative
10. • Consider the nuclear reaction .
a + X → Y + b
• In this nuclear reaction , the fast moving particle ‘
a ‘ with kinetic energy 𝐸𝑎 is incident on the
target nucleus X , which is assumed to be rest.
• The outcome of the nuclear reaction is the
product nucleus Y having Kinetic energy 𝐸𝑦 and a
new emitted particle ‘b’ with kinetic energy
energy 𝐸𝑏.
• The total change in kinetic energy i.e. Q – value is
given by
Q = (𝐸𝑦 + 𝐸𝑏 ) - 𝐸𝑎 ---------(1)
11. • Let 𝑀𝑥 and 𝑀𝑦 be the rest mass of target nucleus
and product nucleus.
• And 𝑚𝑎and 𝑚𝑏 be the mass of incident and
emitted particle.
• According to law of mass-energy conservation
𝑀𝑥𝑐2
+ (𝑚𝑎𝑐2
+ 𝐸𝑎) = (𝑚𝑦𝑐2
+ 𝐸𝑦) + (𝑚𝑏𝑐2
+ 𝐸𝑏)
(𝐸𝑦 + 𝐸𝑏 ) - 𝐸𝑎 = (𝑀𝑥 + 𝑚𝑎) 𝑐2
- (𝑀𝑦 + 𝑚𝑏) 𝑐2
Q = (𝑀𝑥 + 𝑚𝑎) 𝑐2
- (𝑀𝑦 + 𝑚𝑏) 𝑐2
Hence the Q value of a nuclear reaction is defined
as the difference between kinetic energies of
product and incident particle.
12. • Exo-ergic nuclear reaction –
If the Q- value of a nuclear reaction is positive
then there is liberation of energy and it is known
as axoergic ( exothermic ) nuclear reaction.
In this case , the K.E. of products is greater
than the K.E. of reactants and the energy is
released in the process.
(𝐸𝑦 + 𝐸𝑏 ) > 𝐸𝑎
Hence Q >0 , The reaction is axoergic
13. Endo-ergic nuclear reaction
If the Q- value of a nuclear reaction is negative
then there is absortion of energy and it is known
as endoergic ( endothermic ) nuclear reaction.
In this case , the K.E. of products is less
than the K.E. of reactants and the energy is
released in the process. Energy is required for
the reaction
(𝐸𝑦 + 𝐸𝑏 ) < 𝐸𝑎, Hence Q <0 , The reaction is
endoergic
14. Nuclear reaction cross-section
• The probability of occurrence of a nuclear
reaction is expressed in terms of cross-section
of a nuclear reaction.
• It is defined as the effective target area
presented by the nucleus to the incident
particle for a particular type of nuclear
reaction .
• It is denoted by 𝜎
15. • Consider the slab of material whose area is ‘A ‘
• Thickness dx
• Volume of the slab A.dx
• Let n be the atom per unit volume in the
target material.
• Total number of nuclei in the slab = nAdx
• We assume that each nucleus has cross-
section of 𝜎.
• Aggregate cross-section for all nuclei= 𝜎nAdx
16. • Let N = number of incident particle in a
bombarding beam.
• dN = number of particle that interact with
nuclei in the slab.
•
𝑑𝑁
𝑁
=
𝐴𝑔𝑔𝑟𝑒𝑔𝑎𝑡𝑒 𝑐𝑟𝑜𝑠𝑠−𝑠𝑒𝑐𝑡𝑖𝑜𝑛
𝑡𝑎𝑟𝑔𝑒𝑡 𝑎𝑟𝑒𝑎
=
𝜎nAdx
𝐴
= 𝜎ndx
• 𝜎 =
𝑑𝑁/𝑁
𝑛𝑑𝑥
---------(1)
• This is the expression for microscopic cross-
section per nucleus
17. Cerenkov Radiation
• It has been observed that when a high energy
charge particle with nonzero rest mass such as
electron, travels faster than the speed of light in
the medium, then the particles emits special kind
of radiation called Cerenkov radiation.
• The wavelength of Cerenkov radiation lie in and
around the visible region of electromagnetic
spectrum.
• The characteristics blue glow of an under water
reactor is due to Cerenkov radiation .
18. • Cerenkov radiation is emitted in the form of a
cone having an angle 𝜃 defined by
cos 𝜃 =
1
𝛽𝑛
, Here 𝛽 =
𝑣
𝑐
Where
n = refractive index of the medium.
v = velocity of particle in the medium.
c = velocity of light in vacuum.
the necessary condition for the emission of
Cerenkov radiation is
𝛽 >
1
𝑛
but 𝛽 =
𝑣
𝑐
,hence v >
𝑐
𝑛
19. • Here
𝑐
𝑛
is velocity of light in the medium.
• Cerenkov radiation is an electromagnetic
radiation , emitted by an energetic charged
particle travelling through a dialectic medium
at a speed faster than that of light in that
medium.
20. Absorption of 𝛾 – rays by matter
• The 𝛾 rays are electromagnetic radiations
consisting of a stream of very high energy
photons.
• When a beam of 𝛾 – ray photons is made to
incident on the sheet of absorbing material ,
each photon is removed individually from the
beam in a single event.
• This process is responsible for the absorption
of 𝛾 rays in the matter .
21. • The emergent beam from the absorbing sheet
is found to have a smaller intensity i.e. it is
said to be attenuated.