Soda pdf pdf software to create, convert, edit and sign files. Management of ozonedepleting substances reported to the. Frequently asked questions and answers the 20th anniversary of the montreal protocol on substances that deplete the ozone layer general science questions 1 what is the ozone layer and where is it in the atmosphere. On this page you can read or download mcq on environmental pollution depletion ppt in pdf format. The depletion mosfet the physical construction of a depletion mosfet is identical to the enhancement mosfet, with one exception. This powerpoint presentation will guide the students through a description of the earths ozone layer and the concept behind ozone depletion. Ozone depletion is affecting the human health and environment negatively, as it allows the penetration of uv radiations to reach the earth. Natural refrigerants sustainable ozone and climatefriendly alternatives to hcfcs proklima international.
Ozone depletion ozone depletion chlorofluorocarbon free. View and download powerpoint presentations on depletion of ozone layer ppt. Ozone is a naturally occurring gas in the atmosphere. Footscray, victoria table 1 global warming and ozone depletion potential of anaesthetics chemical formula lifetime yrs isoflurane chf. Presentation on ozone depletion free download as powerpoint presentation. The ozone layer is found in the upper stratosphere and its primary function is to filter ultraviolet shortwave radiation that comes from the sun. Convert microsoft word, powerpoint, and excel files to pdf.
A number of comments also identified areas for technical clarification and. In addition, increased surface uv leads to increased tropospheric ozone, which is a health risk to humans. Cfcs, hcfcs, halons, methyl bromide, carbon tetrachloride, and methyl chloroform. Presentation on ozone depletion ozone depletion medicine. Go from a pptx file to a pdf document with fewer clicks. Edit your pdf file online and for free with this high quality converter or compress, merge, split, rotate, sort or protect your pdf documents. A free powerpoint ppt presentation displayed as a flash slide show on id. At ground level, ozone is a pollutant that can harm human health. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer. Ozone layer and ozone layer depletion powerpoint free.
All of the assessment documents core assessment report, executive summary, and twenty questions and answers about the ozone layer. British atlantic survey research station, holly bay, antarctic coast. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Organizations wmo scientific assessment of ozone depletion.
Temperature of the stratosphere is a key factor, as is sunlight, in the depletion of ozone. Ppt ozone depletion powerpoint presentation free to. If you continue browsing the site, you agree to the use of cookies on this website. Remote work advice from the largest allremote company. Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. Ozone depletion is the process of destruction of the ozone layer which can cause adverse effects on the living forms by many pollutants releases out from the vehicles, industries etc. In the stratosphere, however, ozone forms a layer that protects life on earth from the suns harmful ultraviolet uv rays. Inexpensive light extremely stable, inert traditional refrigerants ammonia, sulfur dioxide, methyl chloride highly volatile caustic and toxic remove heat through vaporization of liquefied gas only adequate as refrigerants expensive heavy transport, storage. B dobson inferred correctly that the cause of the warm stratosphere was heating by the absorption of ultraviolet solar radiation by ozone, and he set out to. Scientific study on external ionising radiation exposure during vehicle radiographic inspections xray study 5 december 2014, vienna, austria. Polyadpribose1 parp1 is a key mediator of cell death in excitotoxicity, ischemia, and oxidative stress. Scribd is the worlds largest social reading and publishing site. This helps you give your presentation on depletion of ozone layer in a conference, a school lecture, a business proposal, in a webinar and business and professional representations. The depletion of the worlds natural resources is population the problem.
B dobson and other scientists in measuring concentrations of chloride and ozone in the atmosphere g. Protecting the ozone layer department of the environment. To be able to explain how the ozone layer protects the earth from harmful ultraviolet uv radiation and explain how ozone depletion takes place. The ozone layer refers to a region of earths stratosphere that absorbs most of the suns uv radiation. Create pdfs from any file, convert pdf to word, excel, ppt, jpg, and merge multiple files. The conduction channel is physically implanted rather than induced. Why the hole in the atmospheric ozone layer above us. Odp values are used to provide a simple way to compare the relative ability of various ods to destroy stratospheric ozone. The hole in the ozone layer was first noted in the 1980s, and is of concern as increased. Smog a type of air pollution that is a mixture of oxidants and particulate matter. When you select that layer in the layers in pdf list, a bullet appears next to the. Evs global warming, ozone depletion ppt ozone depletion. This alternative type of transistor acts as a current source until the output approaches 1, then acts as a resistor.
New powerpoint files are available here on the twenty questions and answers about ozone. It contains high concentrations of ozone o3 relative to other parts of the atmosphere. This helps you give your presentation on depletion of ozone layer in a conference, a school lecture, a business proposal, in a webinar and business and professional representati. Ozone depletion potential odp the odp of a compound is defined as the ratio of the total amount of ozone destroyed by that compound to the amount of the ozone destroyed by the same mass of cfc11. P is connected to negative terminal and n connected to positive terminal.
At the end of 20, 258 projects have been committed for an. Use our online service to convert pdf to ppt in a heartbeat. Downloads scientific assessment of ozone depletion 2018. Pdf nac depletion as an initiator of er stressinduced. Ozone layer depletion cause, effects, and solutions. Find powerpoint presentations and slides using the power of, find free presentations research about ozone ppt. There are important effects of changes in the intensity of solar uv radiation resulting from stratospheric ozone depletion, particularly uvb. Within the stratosphere, the ozone layer is the portion that contains the highest. Odp is defined as the integrated change in total ozone per unit mass. Ozone exists within both the tropospheric and stratospheric zones of the earths atmosphere in the troposphere, ground level ozone is a major air pollutant and primary constituent of photochemical smog in the stratosphere, the ozone layer is an essential protector of life on earth as it absorbs harmful uv radiation before it reaches the earth.
Ozone layer depletion, its causes and its effects scribd. Case study depletion of ozone in the atmosphere the work of g. Thus the environmental limits to economic growth manifest themselves as either. Depletion load processes replace this transistor with a depletion mode nmos at a constant gate bias, with the gate tied directly to the source. Engineering and manipulation of matter on atomic and molecular scale physical substances with structural dimensions between 1 and 100 nanometers nm 1 nm 1 billionth of a meter natural vs.
Causes of ozone layer depletion and its effects on human. Holes being the major carrier in p gets attracted to ve terminal as opposite opposite. What are the depletion width in the nregion, the depletion width in the pregion, and the builtin potential at 300k. Explain how using a can of hairspray can effect the ozone layer depletion. Fred magdoff environmentalists and scientists often refer to the two different ends of the environmental problem as sources and sinks. October average for total ozone over antarctica, 19551995 based on british measurements from weather balloons. The montreal protocol the montreal protocol on substances that deplete the ozone layer is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances believed to be responsible for ozone depletion.
With less ozone in the atmosphere, more ultraviolet radiation strikes earth, causing more skin. Click on export, choose create pdfxps document, then click on the box that. View and download powerpoint presentations on ozone ppt. Chlorofluorocarbons or the cfc are the main cause of ozone layer depletion. There is shortage of drinking water and water for irrigation. Depletion of natural resources by jordan wilfert on prezi. Ozone depletion free download as powerpoint presentation. Pdf causes of ozone layer depletion and its effects on.
Ppt ozone layer depletion authorstream presentation. Ozone depletion ozone depletion a global crisis squamous basal melanoma montreal protocol meeting of 36 nations to cut emissions of cfc s aimed to reduce emissions by 35% between. Ozone and environment ozone o3 a gas composed of three atoms of oxygen bluish gas that is harmful to breathe nearly 90% of the earths ozone is in the stratosphere and is referred to as the ozone layer ozone absorbs a band of ultraviolet radiation called uvb ozone depleting substances ods. Insert pdf file content into a powerpoint presentation powerpoint. Environmental education resources to commemorate earth days 50th anniversary. Project ozone layer depletion pdf the stratospheric ozone layer forms a thin shield in the upper atmosphere, protecting life on earth from. The ozone depletion potential odp of a compound is a simple measure of its ability to destroy stratospheric ozone. By definition, ntype semiconductor has an excess of free electrons compared to the ptyp. The depletion region reduces as the forward bias is increased. Ozone layer depletion is one of the major environmental issues which is getting thinner day by day as a. The main causes responsible for the depletion of the ozone layer are listed below. Controlling ozone depletion 1 international environmental policy controlling ozone depletion 2 ozone the basics.
The graphics and powerpoint files included on the distributed cd contained errors. Ozone is a gas that is naturally present in our atmosphere, and it is found. Memorandum updating atmospheric health effects model. Ozone layer depletion, its causes and its effects free download as powerpoint presentation. Arrows indicate fragmented apoptotic nuclei in hela s3 cells with depleted a nac. Ppt effects of ozone depletion powerpoint presentation. The output powerpoint presentation will retain its original. Solving all your pdf problems in one place and yes, free. Ozone depletion potential article about ozone depletion. It shields the entire earth frommuch of the harmful uv radiationthat comes from the sun 3. The term ozone depletion means more than just the natural destruction of ozone damage in the ozone layer will naturally mean the entry of harmful rays in to the atmosphere.
The ozone layer is mainly found in the lower portion of the stratosphere, about 20 to 30 km 12 to 19 miles above the earth, though the thickness varies seasonally and geographically. The genesis of scientific assessment of ozone depletion. These radiations can cause severe diseases in humans such as skin cancer, eye damage and genetic mutations etc 9. Physics of semiconductor devices pn junction depletion width problem a silicon pn diode has a doping of n d 81015 1 cm3 and n a 210 16 1 cm3. The vienna convention for the protection of the ozone layer. Global warming and ozone layer depletion are two different problems see the sidebar misconceptions about global atmospheric change on page 95.
Smallpdf the platform that makes it super easy to convert and edit all your pdf files. Our powerpoint presentation about ozone depletion, its effects and its causes. Scientific assessment of ozone depletion 2006 twenty. Helvetica neue light arial avenir helvetica neue times new roman office theme office theme 5. The ozone layer depletion is a major concern and is associated with a number of factors. Suppose you have a pn junction diode and it is reverse biased.
View ozone layer depletion research papers on academia. A simple example is ozone depletion in the upper stratosphere leading to lower. Ozone depletion is the seasonal loss of a large swath of our stratospheric ozone above antartica, as well as the general degradation of this protective layer around the globe. The ozone layer was discovered in 19 by the french physicists charles fabry and henri buisson. It contains some videos and gif at thte end from an external source. Chlorine atoms react with ozone, starting a chemical cycle that destroys the good ozone in that area. Presentation on ozone depletion slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Does at any point it reach zero or negligible length. Greenhouse gases and ozone hole temperature and ozone take home points continued anthropogenic release of greenhouse gases, not only cfcs, into the atmosphere will enlarge the ozone holes, letting more harmful uv rays reach the earths surface.
Ozone o 3 a secondary pollutant made up of three oxygen atoms bound together. Chapter 15 air pollution and stratospheric ozone depletion. The ozone layer protects living things from harmful ultraviolet rays from the sun. Ozone depleting substances reported to tri many class i and class ii ozone depleting substances are included on the tri chemical list, and hence, the quantities released to the environment or otherwise managed as waste are reportable to epas tri program.
The ozone layer is a part of the earths atmosphere that has relatively high levels of ozone o3. Ozone is a gas that occurs both at groundlevel and in the earths upper atmosphere, known as the stratosphere. Then retrieve your new file format in a matter of seconds. Ppt ozone layer depletion powerpoint presentation free. Resource depletion, peak minerals and the implications for.
Cfcs nonflammable nontoxic trap heat good insulators. Luis favelaas we have seen, the atmosphere is divided into several layers. Title vi for stratospheric ozone protection, signed into law. Ask about converting your car to a substitute refrigerant if the ac system needs major repair. Jan 20, 2010 causes of ozone depletion there are two different types of ozone depletion, both are very similar. Find powerpoint presentations and slides using the power of, find free presentations research about depletion of ozone layer ppt. Physics of semiconductor devices pn junction depletion width. To the point where a seasonal hole in the ozone layer began to appear above the antarctic. Ozone depletion facts and information national geographic. How do i save a powerpoint file as a 3slidesperpage pdf file. An increase in chlorofluorocarbons in the upper stratosphere will break down the existing ozone layer which.
From the 10 km to about 50 km, is known by the name of stratospheric layer. Ozone depletion over india with so much worry about the rapid ozone depletion taking place in various parts of the earth, indian scientists are closely monitoring the ozone layer over india for possible depletion trends. Lessons learned implementation contractor training is a fairly heavy lift 1020 hours to get a contractor certified in use of doe tool vermont will be providing focused, 2day trainings with. This timeline highlights the average area of the ozone hole between september 7th and october th as observed by nasa spacedbased instruments see colored bars and scale. Background of nanotechnology what is nanotechnology. In addition, all figures are available for download, in three formats. Insert pdf content into your presentation either as a picture that shows on your slide, or as a document that you can open during your slide show. Ozone depletion potentials odps were a very important measure in the formulation of the montreal protocol and its amendments. The first one has been a slow, but steady ozone depletion of 4% per decade of the earths. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. There, between 15 and 30 km, is where what is known as ozone.
Online pdf converter edit, rotate and compress pdf files. Electrons and holes diffuse into regions with lower concentrations of electrons and holes, much as ink diffuses into water until it is uniformly distributed. The vienna convention for the protection of the ozone layer 3 2. One chlorine atom can break apart more than 100,000 ozone molecules. Ozone layer is a thin, fragileshield that contains relatively highconcentrations of ozone.
If the value of v gs is positive, the channel is further enhanced. How is a depletion layer formed in a pn junction diode. Or decrease in stratospheric ozone around earths polar region this phenomena is referred as ozone hole. Powerpoint is the worlds most popular presentation software which can let you create professional depletion of ozone layer powerpoint presentation easily and in no time. Ozone depletion would magnify all of the effects of uv on human health, both positive including production of vitamin d and negative including sunburn, skin cancer, and cataracts. Unlike oxygen o2, ozone has a strong scent and is blue in color. Global warming is caused by the greenhouse effect, which is essential to life as we know it on planet earth.
In 1985, using satellites, balloons, and surface stations, a team of researchers had discovered a balding patch of ozone in the upper stratosphere, the size of the united states, over antarctica. Photochemical oxidant a class of air pollutants formed as a result of sunlight acting on compounds such as nitrogen oxides. Ozone has an effect like sunburn on the lining of the respiratory tract damaging the cells ozone in the stratosphere is nicely out of the way and has the wonderful benefit to life on earth that it specifically absorbs the harmful ultraultraviolet light from the sun while letting other light wavelengths through. Knee voltage of a diode is defined as the minimum amount of forward bias required for the diode to show significant conduction. Ozone depletion ozone depletion chlorofluorocarbon. Thus, for a depletion nmos transistor, the channel conducts even if v gs0. Effects of ozone depletion 1 effects of ozone depletion 2 the discovery. Presentation on ozone depletion linkedin slideshare. Ozone absorbs a band of ultraviolet radiation called uvb. Chapter 14 depletion of resource what depletion of resources is. Almost all physical, chemical, biological and other activities are responsible for environmental degradation. Ozone depletion is when cfcs, or chlorofluorocarbon molecules, react. To this end the parties shall, in accordance with the means at their disposal and their capabilities. The ozone layer is mainly found in the lower portion of the stratosphere.
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