Van de Graff generator uses an insulating belt to transfer static electric charge to a large spherical conductor, allowing it to build up a very high voltage potential. It works by using corona discharge from sharp points to charge the belt, which then induces opposite charges on a collecting comb attached to the sphere. As the belt continuously circulates, more charge is transferred to the sphere, eventually reaching potentials of millions of volts. This high voltage can be used to accelerate subatomic particles for physics research experiments. However, it produces only low currents and has limitations in the maximum voltage possible due to air breakdown.
cyclotron that accelerate the charge particles prior their bombardment to the target nuclei.
it is developed by E.O.Lawrence & he was awarded by nobel prize in this work. it accelerate the particle from 1MeV to the more than 100 MeV.
it contains the electric & magnetic system to accelerate the charge particles.
electric field acts horizontally & magnetic field act vertically.
particle moves in spiral path and its energy , radius & velocity increases.
after that it moves out of window ( diflactor plate) n hit the target.
n then the nuclear reaction starts.
it is used to treat cancer.
produce positrons emission isotopes for PET imaging.
it do not accelerate the neutrons, electrons & positive charge with higher mass.
This kind of Van de Graaff generator is made up of:
• A motor
• Two rollers
• A belt
• Two brush assemblies
• An output terminal (usually a metal or aluminum sphere)
The strong negative charge from the roller now begins to do two things:
1. It repels the electrons near the tips of the lower brush assembly.
2. It begins to strip nearby air molecules of their electrons.
Applications:
1. It is used to generate x-rays, which is widely used in medicine field.
2. It is used in atom smasher’s, which is used in research purposes.
3. It found applications in physics, medicine, and astro physics.
A particle accelerator
Sends charged particles, which constantly accelerate through a ‘Dee’, through a circular path until they are (most likely) directed towards a designated target for a specific purpose
cyclotron that accelerate the charge particles prior their bombardment to the target nuclei.
it is developed by E.O.Lawrence & he was awarded by nobel prize in this work. it accelerate the particle from 1MeV to the more than 100 MeV.
it contains the electric & magnetic system to accelerate the charge particles.
electric field acts horizontally & magnetic field act vertically.
particle moves in spiral path and its energy , radius & velocity increases.
after that it moves out of window ( diflactor plate) n hit the target.
n then the nuclear reaction starts.
it is used to treat cancer.
produce positrons emission isotopes for PET imaging.
it do not accelerate the neutrons, electrons & positive charge with higher mass.
This kind of Van de Graaff generator is made up of:
• A motor
• Two rollers
• A belt
• Two brush assemblies
• An output terminal (usually a metal or aluminum sphere)
The strong negative charge from the roller now begins to do two things:
1. It repels the electrons near the tips of the lower brush assembly.
2. It begins to strip nearby air molecules of their electrons.
Applications:
1. It is used to generate x-rays, which is widely used in medicine field.
2. It is used in atom smasher’s, which is used in research purposes.
3. It found applications in physics, medicine, and astro physics.
A particle accelerator
Sends charged particles, which constantly accelerate through a ‘Dee’, through a circular path until they are (most likely) directed towards a designated target for a specific purpose
ER Publication,
IJETR, IJMCTR,
Journals,
International Journals,
High Impact Journals,
Monthly Journal,
Good quality Journals,
Research,
Research Papers,
Research Article,
Free Journals, Open access Journals,
erpublication.org,
Engineering Journal,
Science Journals,
As the belt passes in front of the lower comb, it receives negative charge that escapes from its points due to the influence of the electric field around the lower pulley, that ionizes the air at the points. As the belt touches the upper roller (3), it transfers some electrons, leaving the roller with a negative charge (if it is insulated from the terminal), which added to the negative charge in the belt generates enough electric field to ionize the air at the points of the upper comb. Electrons then leak from the belt to the upper comb and to the terminal, leaving the belt positively charged as it returns down and the terminal negatively charged. The sphere shields the upper roller and comb from the electric field generated by charges that accumulate at the outer surface of it, causing the discharge and change of polarity of the belt at the upper roller to occur practically as if the terminal were grounded. As the belt continues to move, a constant charging current travels via the belt, and the sphere continues to accumulate negative charge until the rate that charge is being lost (through leakage and corona discharges) equals the charging current...............The larger the sphere and the farther it is from ground, the higher will be its final potential.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
2. Van de Graff generator
• INTRODUCTION
• INVENTION
• PRINCIPLE
• CONSTRUCTION
• WORKING
• APPLICATIONS
• LIMITATIONS
3. INTRODUCTION
• Van De Graff generator is used to
generate high potential differences of near
about million volts.
• The high voltages generated by the
generator can be used for accelerating
subatomic particles to high speeds, making
the generator a useful tool for fundamental
physics research.
• Invented in 1929 by American physicist
Robert J.
Van de Graff at Princeton University, with
help from colleague Nicholas Burke.
4. PRINCIPLE This Van de Graff generator works on
the principle of electrostatic induction and action at
points.
Uses two principles of Electrostatics
• Corona Discharge :- Discharging action
of sharp points, i.e., electric discharge
takes place in air or gases readily, at
pointed conductors.
•Receiving action-- If the charged
conductor is brought in to internal
contact with a hollow conductor, all of its
charge transfers to the surface of the
hollow conductor and scatters uniformly
over it no matter how high the potential
5. Construction
• Hollow metal sphere --There is a large spherical
conductor named S having a few meters of radius.
• Insulating pillars-- It is placed on two pillars at a
certain height from the ground.
One is p1 and other is p2.
• An endless belt --An endless belt b made up of
insulating material such as rubber, silk or a similar
flexible dielectric material, is moving over two pulleys
P1 and P2.
• Two pulleys P1 and P2 --The pulley P2 is present at the
centre of the spherical conductor S and the pulley P1 is
present vertically below P2 near the ground.
6. • A motor M-- A motor M is used whose main
function is to create a spin in the belt.
• Two sharp headed combs-- Two sharp
headed combs, spray comb B1 and collecting
comb B2 are used.
• A discharge tube D-- A discharge tube D is
used in which the acceleration of ions is done.
The point from where the ions originate is
present at the head end of the discharge tube.
But the other end of the tube is earthed.
• Nitrogen or Methane gas --The whole
apparatus is placed in a steel compartment.
Compartment is filled with Nitrogen or
Methane. The pressure inside the chamber is
maintained very high.
7. Working
The initial start given to generator is by giving the first comb B1 a positive potential by a strong
source of near about 104 Volt.
Electric wind having a positive charge will be produced. Production of wind occurs due to the
discharging of charge from the sharp edges.
Belt moves continuously and will reach the sphere on moving. When the belt will reach the sphere
an induced negative charge will be produced on the sharp edges of the comb B2.
At once a induced positive charge will be produced on the other side of the comb B2. After this
shifting of the charge,it will be transferred to sphere S.
Similarly, due to the discharging action of the B2, wind will be produced but this will be negatively
charged. The negatively charged wind helps to make the positively charged belt neutral.
After this the belt will be totally discharged. Again after rotation, the belt will come down. It will take
the positive charge from the comb B1. Then again this charge will be taken by the comb B2.
The above process repeats again and again. Due to the repetition the charge will start collecting on
the sphere S.
8. Charge carrying capacity of the sphere will be shown with the formula.
= 4 R
In the above equation, R is the radii of the spherical shell.
As we know that V= Q/C
Therefore V=Q/ 4 R
From the equation it is clear that the potential and charge are directly proportional to each other.
As we will increase the charge the V i.e. potential will also increase.
The air present around the sphere S will start ionizing when the potential of the spherical belt will
cross the value of 3 X 10 6. 3 X 10 6 is the value of the air’
s breakdown field.
When the ionization of air starts then side by side leakage of charge will also take place.
As we have discussed earlier that the generator is packed into a steel compartment filled with gas
such as methane or nitrogen. So, leakage is minimized by this steel chamber.
9. • As the belt continues to move, a constant charging current travels via the belt,
and the sphere continues to accumulate negative charge until the rate that
charge is being lost (through leakage and corona discharges) equals the charging
current.
• The larger the sphere and the farther it is from ground, the higher will be its
final potential.
APPLICATIONS
• They are used where a very high voltage at very low current is needed.
• Used to accelerate projectiles like proton, deuteron etc. to carry out different
nuclear reactions.
• In medicine, such beams are used to treat cancer.
• Used to study collision experiments in physics.
10. LIMITATIONS
• It produces very low intensity of current as compared to voltage.
• Maintenance and construction is costly and bulky.
• For air, a maximum of 3 million volt can be generated as after that air will
ionize.
• It cannot accelerate neutral particles.