Electromagnetic interference
Sparks from electrostatic machines of all types are prodigious sources of electromagnetic interference, which may adversely affect the operation of nearby electronic equipment. Indeed prolonged use might contravene the Electromagnetic Compatibility Regulations.
Most importantly, anyone fitted with medical electronic equipment (eg, any type of hearing aid or pacemaker) must keep well away from a working electrostatic generator because the electromagnetic interference may cause these devices to malfunction. In practice, we recommend that, while viewing such a demonstration, a pupil wearing such equipment should keep a minimum of 6 metres from a working generator. Very occasionally, a pupil with a particular medical condition (eg, fitted with a cochlear implant) may have received specific safety advice relating to the use of electrostatic generators; this advice must be heeded.
It is wise to warn any computer users in the vicinity that a generator is to be used at a certain time and that their computer data may be corrupted as a result. Nearby computers, interactive whiteboards or similar electronic equipment (eg, a data projector) should be switched off and the generator operated well away from them.
Charging a pupil with a Van de Graaff generator
Many teachers use the Van de Graaff generator to illustrate the repulsion between ‘like’ electric charges by charging a child, to make his or her hair stand on end. This activity is very safe, provided the guidance below is followed.
Safety when charging pupils
Only a Van de Graaff generator should be used for this demonstration; Wimshurst machines must not be used. Personal electronic equipment, such as mobile phones, personal organisers and wristwatches should be kept at least 2 metres away. As a precaution, anyone with a known heart condition should not be accepted as a volunteer for this activity.
Only one child at a time should be insulated from the ground and charged. When two children are insulated and charged together, the shock experienced on discharge may be sufficient to frighten the child receiving it. No children should be persuaded to take part unless they genuinely wish to do so.
~Extracted from CLEAPSS 2008[12.9.1]
27.5.08
23.5.08
22.5.08
Virus protection
Below is a script about computer virus protection advice from Microsoft.
Nothing can guarantee the security of your computer 100 percent.
You can continue to improve your computer's security and decrease the possibility of infection by using a firewall, keeping your system up-to-date, maintaining a current antivirus software subscription, and following a few best practices.
Tip: Because no security method is guaranteed, it's important to back up critical files on a regular basis before you encounter a virus or other problems.
Steps to help avoid viruses:
1.
Use an Internet firewall (Note: Windows XP with SP2 has a firewall already built-in and turned on by default).
2.
Visit Microsoft Update and turn on automatic updating.
Note: If you've installed Office 2003 or Office XP, Automatic Updates will also update your Office programs. If you have an earlier version of Office, use Office Update.
3.
Subscribe to industry standard antivirus software, such as Windows Live OneCare and keep it current.
4.
Never open an e-mail attachment from someone you don't know.
5.
Avoid opening an e-mail attachment from someone you know, unless you know exactly what the attachment is. The sender may be unaware that it contains a virus.
Top of page
What about spyware?
Although spyware programs are different from viruses, some can behave like viruses and pose similar and other risks. To help protect against spyware, use antispyware software such as Windows Defender. Windows Defender comes with Windows Vista. If you use Windows XP SP2, you can download Windows Defender for no charge.
Source:http://www.microsoft.com/protect/computer/viruses/prevent.mspx
Nothing can guarantee the security of your computer 100 percent.
You can continue to improve your computer's security and decrease the possibility of infection by using a firewall, keeping your system up-to-date, maintaining a current antivirus software subscription, and following a few best practices.
Tip: Because no security method is guaranteed, it's important to back up critical files on a regular basis before you encounter a virus or other problems.
Steps to help avoid viruses:
1.
Use an Internet firewall (Note: Windows XP with SP2 has a firewall already built-in and turned on by default).
2.
Visit Microsoft Update and turn on automatic updating.
Note: If you've installed Office 2003 or Office XP, Automatic Updates will also update your Office programs. If you have an earlier version of Office, use Office Update.
3.
Subscribe to industry standard antivirus software, such as Windows Live OneCare and keep it current.
4.
Never open an e-mail attachment from someone you don't know.
5.
Avoid opening an e-mail attachment from someone you know, unless you know exactly what the attachment is. The sender may be unaware that it contains a virus.
Top of page
What about spyware?
Although spyware programs are different from viruses, some can behave like viruses and pose similar and other risks. To help protect against spyware, use antispyware software such as Windows Defender. Windows Defender comes with Windows Vista. If you use Windows XP SP2, you can download Windows Defender for no charge.
Source:http://www.microsoft.com/protect/computer/viruses/prevent.mspx
20.5.08
Welcome to SCtechnician Blog
Sharing is our life.
This is a interesting and exciting place to share any technical stuffs. It could be our lab preparation experience, our new idea or any thing that is worthy to share with colleagues.
Improvement may be inspired by sharing.
This is a interesting and exciting place to share any technical stuffs. It could be our lab preparation experience, our new idea or any thing that is worthy to share with colleagues.
Improvement may be inspired by sharing.
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