Select Dept_Id, Sum(Salary) From Emp Group By Dept_Id Having Sum(Nvl(Salary,100)) > 400;
Select Dept_Id, Sum(Salary) From Emp Group By Dept_Id Having Sum(Nvl(Salary,100)) > 400; An EMP or Electro-Magnetic Pulse is an enormous burst of electromagnetic energy that can occur naturally or be produced intentionally utilizing nuclear weapons. While lots of specialists do not believe EMPs posture a big risk, some people argue that these kinds of weapons could be used to trigger widespread interruption to electricity-dependent societies.
The Danger of EMPs
An EMP releases substantial waves of electro-magnetic energy, which can imitate a huge moving magnet. Such a changing electromagnetic field can trigger electrons in a neighboring wire to move, therefore causing an existing. With such a big burst of energy, an EMP can cause harmful power surges in any electronic devices within variety.
Natural EMPs happen when the sun periodically spits out huge streams of plasma, and if they come our way, Earth’s natural magnetic field can deflect them. When the sun spits out enough plasma at when, the impact can cause the magnetic field to wobble and create a powerful EMP.
Then, there’s the possibility of purposeful EMPs. If a nuclear weapon were to be detonated high in the environment, the gamma radiation it would launch could strip electrons from air molecules and accelerate them at near to the speed of light. These charge-carrying electrons would be confined by Earth’s electromagnetic field, and as they zipped around, they would produce a powerful, fluctuating electrical present, which, in turn, would create an enormous EMP. The surge might also distort Earth’s magnetic field, triggering a slower pulse comparable to a naturally taking place EMP.
Setting off a nuclear weapon about 200 miles (300 kilometers) above the U.S. could produce an EMP that would cover the majority of North America. The surge and radiation from the bomb would dissipate prior to reaching ground level, however the resulting EMP would be effective enough to ruin electronic devices throughout the region.
A little EMP with a radius of under a kilometer can likewise be produced by integrating high-voltage source of power with antennas that release this energy as electro-magnetic waves. The U.S. military has a cruise missile carrying an EMP generator. Called the Counter-Electronics High Power Microwave Advanced Missile Project (CHAMP), it can be used to target specific opponent centers and would be within the abilities of numerous militaries, and even terrorist groups, to build an EMP generator.
How to Protect Yourself Select Dept_Id, Sum(Salary) From Emp Group By Dept_Id Having Sum(Nvl(Salary,100)) > 400;
A Faraday Cage is simply a closed box composed of a conductive material such as metal or plastic, which has the effect of creating an invisible field that completely cancels out all electronic energy. Such a cancellation of energy makes the box uninhabitable for anything other than a Faraday Cage. The name Faraday comes from the British engineer who invented the Faraday Laws in 1847. According to this law, any flow of electric current is subject to a gravitational pull. Any change in the distance of the flow from a Faraday Cage to its surrounding environment, produces an opposite reaction, the cancellation of which produces a net charge in the space through which the flow passes.
Such a cancellation cannot occur in systems that are not Faraday Cages. A Faraday Cage can only be affected by an EMP attack by causing it to rapidly fluctuate in its electrical output. Such a disturbance would rapidly disable most electronics, with communication being the first to be affected. As well as electrical systems, the pulse would also affect most military and underground nuclear weapons programs. Therefore, if you are planning on living in a society that is unprepared for an EMP attack, you should invest in personal protective equipment such as a ‘Star Wars’-style deflector grid capable of protecting your body from the pulse.
A Faraday Cage is not the only means of defense against an EMP attack. Any electromagnetic pulse entering a Faraday Shield is also subject to rapid changes in the magnetic field intensity. Such an attack would disable even the most advanced electronic devices such as computers. Therefore, one of the primary effects of such an attack would be the ‘firing’ of the ‘capsules’ within such devices. This process would severely limit the ability to send electronic messages by cell phone, fax or other means of communication.
However, with the development of pulse detection equipment, this problem is easily prevented. Pulse detection systems are designed to quickly detect any changes in the magnetic fields around electrical conductors. Once an object’s pulse is detected, the system will halt all current production until such time that the object’s field has completely returned to normal.
There are many advantages to having a Pulse Detector available in your home. One of the primary reasons is the ‘defense against electromagnetic pulses’. Every day, we are exposed to a high amount of EM radiation (EMR) coming from various sources. Many of these sources produce strong electric currents. Such currents can easily damage our health, as well as our electrical systems. An undetected pulse can easily do just that! Select Dept_Id, Sum(Salary) From Emp Group By Dept_Id Having Sum(Nvl(Salary,100)) > 400;
Some devices are specifically designed to protect against electrical pulses. Some examples of such devices include safe room Pulse Suppressors, Multi-Zone Safety Appliances, and Faraday Walls. These devices will either have a built-in magnet or a Faraday Shield, which will protect the electrical circuitry from intense surges of EMR. Some other similar devices could include: Firewall Panels, Door and Window Safes, and Car Shelters. However, each of these items has a different use and is not necessarily intended for all situations.
In order for an attacker to bring down a Protection System, it would be necessary to locate one of these devices within the protected area and trigger it. Unfortunately, it is often impossible to know where this device will be located or exactly when it will activate without inside information. Also, an enemy with many sources of EMR could successfully disable or otherwise take down a single device without triggering other devices.
In addition, in order to properly protect yourself from such an attack, it would be necessary to not only protect the protected equipment but your personal safety as well. While some people are able to withstand short-term attacks, a sustained attack could kill them. For this reason, it would be necessary to have multiple layers of protection. As long as each layer can cover the different sources of EMR, your entire protective system will be safe.
While the thought of an EMP attack is enough to keep you up at night, there are measures that can be taken to protect yourself. Surviving an EMP attack initially is just the beginning. Without a proper plan in place to protect yourself in the aftermath can be a deadly misstep.
It is estimated that roughly fifty percent of the radiation from nuclear surges around the world is given off in the kind of this thermal pulse. It has been approximated that around one hundred fifty thousand to one million people worldwide are impacted directly by EIM‘s every year. Select Dept_Id, Sum(Salary) From Emp Group By Dept_Id Having Sum(Nvl(Salary,100)) > 400;
An emp attack takes place when a device is mistakenly harmed by an EIM while in use. The device is most frequently used to secure computer networks from invasion or disturbance of service. The damage often includes a short circuit, disrupting power to the system. The bulk of computer system systems are not vulnerable to EIM effects, certain devices, such as servers, routers, fax makers, backup generators, backup power tools, personal digital assistants (PDAs), cellular phones, pagers, fax servers, telephone sets, computer systems, and television sets are specifically susceptible to EIM results. In addition, particular medical equipment and gadgets are also at risk of being impacted by an EIM.