According to Nada
Saturday, 1 March 2014
Sunday, 9 February 2014
Central Heating System:
The parts of the central hating system:
1) Water Boiler2) Hot water cylinder
3)Pumbs
4) radiators
The role of ICT in central heating system:
The heating system consists of a sensor that senses the temprature of the water and change the analogue signals into digital signals by (ADH) for the microprossesor to read it, then converts the digital signals into analogue signals, then it will be send to the actuator to be commanded ( either to switch on or off the heating system).Robots for cars manufacturing:
Parts of the Robot:
1) Metallic arm2)Joints
3) End effectors
End effectors
In robotics, an end effector is the device at the end of a robotic arm, designed to interact with the environment. The exact nature of this device depends on the application of the robot.types :
Impactive – jaws or claws which physically grasp by direct impact upon the object.Ingressive – pins, needles or hackles which physically penetrate the surface of the object (used in textile, carbon and glass fibre handling).
Astrictive – suction forces applied to the objects surface (whether by vacuum, magneto- or electro-adhesion).
Contigutive – requiring direct contact for adhesion to take place (such as glue, surface tension or freezing).
Drilling - drills holes
sprayer - sprays and paints the objects.
Monday, 28 October 2013
1-Screen Magnifier
A screen magnifier is software
that interfaces with a computer's graphical output to present enlarged screen
content. It is a type of assistive technology suitable for visually impaired
people with some functional vision; visually impaired people with little or no
functional vision usually use a screen reader.
The simplest form of magnification
presents an enlarged portion of the original screen content, the focus, so that
it covers some or all of the full screen. This enlarged portion should include
the content of interest to the user and the pointer or cursor, also suitably
enlarged. As the user moves the pointer or cursor the screen magnifier should
track with it and show the new enlarged portion. If this tracking is jerky or
flickers it is likely to disturb the user. Also, the pointer or cursor may not
be the content of interest: for example, if the user presses a keyboard
shortcuts that opens a menu, the magnified portion should jump to that menu.
Pop-up windows and changes in system status can also trigger this rapid
shifting.
Screen magnifier can be especially
helpful for people suffering from low vision, for example, many elderly users.
However, Hanson points out that people with low vision often also suffer from
additional disabilities such as tremors. Pramudianto et al. compared different
magnification techniques to use a Wii Remote as a magnifier for distant
displays. They determined that users have a lower error rate for selecting
small targets if using one of the tested magnification techniques.
Tuesday, 8 October 2013
Monday, 30 September 2013
Passport :
A passport is a document, issued by a national government, which certifies the identity and nationality of its holder for the purpose of international travel. The elements of identity contained in all standardized passports include information about the holder, including name, date of birth, gender and place of birth
E-passport :
. is a combined
paper and electronic passport that contains biometric information that can be
used to authenticate the identity of travellers. It uses contactless smart card
technology, including a microprocessor chip (computer chip) and antenna (for
both power to the chip and communication) embedded in the front or back cover,
or center page, of the passport. Document and chip characteristics are
documented in the International Civil Aviation Organization's (ICAO) Doc 9303
The passport's critical information is both printed on the data page of the
passport and stored in the chip. Public Key Infrastructure (PKI) is used to
authenticate the data stored electronically in the passport chip making it
expensive and difficult to forge when all security mechanisms are fully and
correctly implemented.
The currently standardized biometrics
used for this type of identification system are facial recognition, fingerprint
recognition, and iris recognition. These were adopted after assessment of
several different kinds of biometrics including retinal scan. The ICAO defines
the biometric file formats and communication protocols to be used in passports
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