אנרגיה גרעינית
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מצגת אודות מהותה של אנרגיה גרעינית, לעומת מקורות מסורתיים ומקורות חלופיים אחרים. מציגה עקרונות פיסיקליים בסיסיים של ביקוע ומיזוג, ושימוש באנרגיה אטומית. מיועד לתלמידי כתות ט ומעלה.
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אנרגיה
מצגת בנושא אנרגיה
לסרטונים ומצגות בנושאים מדעיים הכנסו לאתר
http://www.weizmann.ac.il/zemed/net_activities.php?cat=1747&incat=1428
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Tieteellinen Kirjoittaminen
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Why we need Alternative Fuel?
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Production, Storage and Transportation of Hydrogen Fuel
Current Status of Hydrogen Fuel
Drawbacks of Using Hydrogen as a Fuel
Energy production & consumption
All natural energy on Earth comes from solar radiation, heat from the Earth's mantle, and gravity. Fossil fuels like coal, oil, and natural gas are limited, non-renewable sources that have formed from ancient organic matter over millions of years. Energy can also be generated renewably from solar, wind, hydroelectric, geothermal, and biomass sources. Nuclear fission of uranium and thorium isotopes in the Earth's crust is another non-renewable source of energy. Hydrogen may become a sustainable energy source in the future.
Materials for hydrogen storage
This document discusses hydrogen storage techniques and carbon-based materials for hydrogen storage. It covers sources of hydrogen production and common hydrogen storage methods like compressed gas tanks and liquid hydrogen. Several carbon materials - graphene, carbon nanotubes, and activated charcoal - show promise for hydrogen storage due to their high surface areas and pore volumes. Graphene and few-layer graphene structures have demonstrated hydrogen uptake of up to 7.5% by weight. The document compares hydrogen storage capacity of different carbon materials and concludes they are advantageous due to cost-effectiveness, stability, storage capabilities, and availability.
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Geothermal energy
Geothermal energy is primarily used in China, where 20% of the world's geothermal energy is utilized, and Portugal's Azores islands. In the Azores, geothermal energy is used to power 5 power plants and heat pans of food buried in the ground. Setting up a home or large power plant using geothermal energy has initial costs, but operating costs are lower than fossil fuels. Geothermal energy is a renewable and clean source that avoids pollution and depletion concerns of fossil fuels, though high initial drilling costs are a potential drawback for some. Geothermal plants work by pumping underground hot water or steam through turbines to generate electricity.
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אנרגיה גרעינית
- 1. אנרגיה גרעינית אנרגיה חלופית החבויה באטום
- 7. הגרעין האיראני בכותרות בראדעי משלים עם אורניום באיראן ? ( 20.02.06 ) דיון סבא " א : חילוקי דעות מונעים הכרעה בדיון בנושא האיראני ( 03.02.06 ) איראן פיתחה בעצמה מכשור להפרדת אורניום ( 01.01.06 ) איראן דוחה ההצעות לפתרון משבר הגרעין ( 06.08.05 ) איראן הודיעה : נחדש ייצור האורניום המועשר ( 30.04.05 ) סולאנה לאיראן : אם לא תאפשרו פיקוח גרעיני - יהיה רע ( 30.08.03 )
- 8. האטום האטום מורכב מגרעין ומאלקטרונים . בגרעין ישנם פרוטונים ונויטרונים .
- 15. כור גרעיני מערכת שבה מתרחש תהליך של ביקוע גרעיני מבוקר , כדי להפיק אנרגיה חשמלית או לצורכי מחקר .
- 16. כור גרעיני