Back to School Stuff

Perfect school bags for kids and younger children, here you got many different kinds of bags some of them are Medium backpacks, Mint medium backpacks, Nap Mats and Mint nap mats. Other than school bags here we have Duffle bags and Laundry bags, Mint laundry bags. Not only for the younger children’s, even for babies we have some products like Mint baby blankets. Toddler backpacks, Lunch totes/Snack squares and Mint snack squares. Towel wraps we got new humor towel wraps. This all are good quality products for children’s and babies. Some of the popular products are Mint personalized Nap mats measurements “18.5 x 46”. this are good for younger children and toddlers, mint nap mats are padded and lined with nylon and cotton with a ribbon trimmed, soft , fleecy blanket and it has a soft fleece blanket attached and a removable foam pillow. And these bags are easy to wash just remove the pillow and wash in washing machine. These bags are much suitable for daycare and preschool children’s. For kid’s backpack we got Mint Toddler backpacks, it’s a styles bag suits for all young children’s and kids. Mint toddler backpack measure “8x11” and made by nylon. The Stephen joseph backpacks it measures some “14x12” and they have some medium sized mint backpacks for older children made by same material and we do have different colors like black & hot pink here the hot pink is for soft ribbon, Pink cheetah, cadet, Camo are liked by most children’s they use for camping and outings. Stephen joseph backpacks made of 100% Cotton and these are machine washable and durable. The front flaps have a doubt drawstring with magnetic snap closure and it has handle on top and shoulder strap for easy use. Its size approximately “11x13” with 4 deep it is used for day care, kindergarten, preschool, dance class.

INTEGRATION OF CAN PROTOCOL

With the increase in number of electronic circuit units(ECUs) that are connected in a network, the complexity in designing the supporting software increases. It is required to take into consideration the example of parking sensors for effective realization of the complexity involved in designing a system which works in real time. Let us suppose we have eight parking sensors, 4 in the front and 4 in the rear. Each sensor is an analog device which continuously transmits radiations and when there is any interference in their field, the sensors output is varied.

            While there is no interference in the field of the sensors, the output of the sensor is constant. But when there is any interference, the output of the sensor varies proportional to the distance between the object and the sensor. But as this is all in terms of analog voltage, there is a requirement for a digitization of this data provided by the sensors. There by use of an ADC is eminent. The resolution of the ADC is the main concern of the system as it is a serial communication protocol.

            If the ADC is an 8bit, then the total bits required for complete 8 sensors would be come 64 bits. With increase in the requirement for the sensible systems, the 8bit ADC might need to be replaced by a 10bit ADC or 16bit ADC, which in turn increases the total number of bits required for a single functionality from 64 bits to 128 bits. This takes up a lot of space and time in the channel. But with the CAN protocol we can make this transmission rate much faster by setting the priority to the sensors and then masking all the other ECUs at the time of parking.

            All this can be done using the link layers and physical layers of the CAN protocol. The integration of several ECUs to a single network requires a controlled monitoring and reception of data from all the nodes. A central controller can be used to store and access the data from each node and according to the data; the required control of required nodes is achieved. When the engine is heated above the normal range, the controller needs to start pumping the coolant much faster so that it can cool down the engine before starts working abnormally.

            Also the control unit needs to have flexibility of including any new MCU, which might come into the market. This flexibility solely lies on the networking the newer nodes with the control unit. Any complicated network with in a limited space can be easily done using CAN protocol and the individual Identifications are allocated to each node in the network, thereby increasing the reliability and secure data transfer between the control unit and the individual nodes.

Certified Nursing Assistant

Feed up working in call centers, your team leader giving lot of pressure to reach the weekly task and your client paying salary which is not enough. So people do you want to work, where you don’t find any kind of pressure and want to take enough salary.  Certified Nursing Assistant every one call it as CNA. Working in hospitals to take care of patients about their basic physical and emotional needs, its a demanding, challenging but ultimately rewarding job, long term care facilities, assisted living centers, home health agencies, hospice agencies and other medical, physical and emotional needs. A certified nursing assistant is a duty to assist nurses. CNA training is for a short period like four weeks and other CAN training programs will be extended to 12 weeks, its depend on the curriculum of the CAN training program and hours per day the training take place. CNA training has classroom time, practical experience working on mannequins or dummies and clinical training working in medical facility with patients. After done with training period the finally comes the small CNA exam, each state mandates its own requirements for the CNA exam. Exam got 2 parts one is written exam which test the basic what you learned in the training session. 

Tool/Appliance Review

Fine MultiMaster FMM 250Q superb multi-purpose tool system for interior fitting and renovation projects it’s a powerful tool well-armed including many useful accessories. You have every thing which you need for interior fitting and renovation jobs, by using this multimaster FMM 250Q you can repair the things on your own and no need to pay hundreds of bugs to the repair guy. Have floor, tile work and window renovation jobs or cabinetry projects and many more can be easily get repaired with FMM 250Q. Do you want see the Fein MultiMaster Review, more than 1,000,000 FMM 250Q have been sold we got so many feedback emails from the customers saying that this handy multipurpose tool has literally taken the world by storm. Fein MultiMaster Top got the powerful 250 watt motor with electronic speed control and lightweight, it has a ergonomic design which make this tool to stand in tight corners and in tough areas.

Job Consultancies

Now a days it become where hard to find a jobs, it may be a software jobs or any other field the unemployed rate is increased day by day and it effecting revenue of the country to solve this problem of unemployment Job Consultancies are introduced to the people. we have so many consultancies in our cities, more then half are Job consultancies. we have different types of job consultancies which search jobs in different fields for all qualified people. this Job consultancies help to find the employers for companies, and jobs for unemployed people.

For students this job consultancies are very useful, after finishing the studies the student should register in consultancy, according to the qualification consultancies people search jobs and forward student resume to companies for interviews. Now a days this job consultancies become very help full to foreign students, they are providing shelter food and they even teach students regarding the subject in which field they would like to work through online class, they conducts interview for the students and they do separate analysis on each an every student to find in which part of the interview the student is getting troubled to clear the interview. they will train and prepare the students as per the company requirement.

Last year because of the Crisis people lost there jobs and so many people were in layoffs, job consultancies are turned off, and it effect so many students and unemployed people to find jobs.

But now the market is getting better slowly day by day.consultancies are started receiving calls from clients to recruit employers. so every student who finish there studies and work in good company should get register in Job Consultancies.

Real Time Embedded System (RTES)

In the day-to-day life we come across a wide variety of consumer electronic products. We are habituated to use them easily and flawlessly to our advantage. Common examples are TV Remote Controllers, Mobile Phones, FAX machines, Xerox machines etc. Each of these devices does have one or more programmable devices waiting to interact with the environment as effectively as possible. These are a class of Embedded Systems and they provide service in real time. i.e. we need not have to wait too long for the action.

Let us see how an embedded system is characterized and how complex it could be? Take example of a mobile telephone we know that a mobile phone is a very complex device which houses a number of miniature gadgets functioning coherently on a single device. Moreover each of these embedded gadgets such as digital camera or an FM radio along with the telephone has a number of operating modes such as adjust the zoom of the digital camera, reduce the screen brightness, change the ring tone, relay a specific song from your favorite FM station to your friend using your mobile You may like to use it as a calculator, address book, emailing device etc. These variations in the functionality can only be achieved by a very flexible device. This flexible device sitting at the heart of the circuits is none other than a Customized Microprocessor it known as an Embedded Processor and the mobile phone housing a number of functionalities is known as an Embedded System. Since it satisfies the requirement of a number of users at the same time it is working within a time-constraint, i.e. it has to satisfy everyone with the minimum acceptable delay. We call this as to work in Real Time. This is unlike your holidaying attitude when you take the clock on your stride. Thus we can name the mobile telephone as a “Real Time Embedded System” (RTES)

Ultraviolet light for illuminating objects

Why is ultraviolet light sometimes used for illuminating objects that should be imaged.

An object, that we can’t detect easily with visible light can be imaged being illuminated by ultraviolet light. Ultraviolet light is electromagnetic radiation with shorter wavelength and higher frequency. For this , ultraviolet light is invisible to human eyes. Ultraviolet light has more penetrating power than visible light. So, within an object ultraviolet light reaches easily and the radiation causes the object fluoresce. Now a days, for many purposes ultraviolet light is being used for detection. Detecting problem under skin, detecting evidence like-human secretions and stains from a crime spot, detecting originality of money, checking security cards are the common uses of ultraviolet light. The marks given for identification are not visible with eyes but can be seen under UV .

Sun emits uv and there are other sources of UV by which an object can be illuminated. An object under UV, emits radiation can be imaged by a camera which only allows UV to reach it’s lens.

To have a precise image of an object, that need to be placed under a UV source. Then with a camera that absorbs all lights except UV, an image can be taken.

Color of object

Discuss how the color of objects is seen by the eye and by a camera in sunlight, moonlight and indoors (with light from light bulbs).

The colors of the object play a prominent role with their identification, but the color of an object is not a fixed property and it depends upon the nature of light. There are various reasons for the changes in color to occur and it is mainly due to dark adapted eye and color blindness. The blue color of the sky is mainly because of scattering of sunlight in the earth’s atmosphere, it is caused by Rayleigh scattering principle which tends to scatter more blue light than red light.

The eye work together with the brain to distinguish between distance of an object and estimate the size of the objects. Sensitivity of bright light occurs mainly due to the exposure of eye to sunlight or any bright objects. This kind of sensitivity is caused by dilate of pupils. An adjustable iris is necessary in both camera and light to range the intensity of light in environment. The difference in light intensities between light and moon-light is one million.

The human eye is more sensitive to light, it allows light to pass through and falls on the most sensitive part of the eye called retina, which is located at the rear part of the eye. Here there are two different photoreceptor cells known as cone and rod cells which are responsible for detecting color and low-light contrast respectively. They convert light into neural signals and responsible for vision. Rod cells cannot distinguish color, but are useful in detecting objects at low light vision. Cone cells are responsible for detecting color vision which intern require more light to function. Cones are further divided into long, medium and short wavelength light.

The objects illuminated with moon light lack color, it is because there is insufficient light for the eyes to perceive. The human eye is very complex than most advanced electronic camera. Here the rods can only sense the intensity of light but it cannot able to detect colors, thus by operating at very low intensity of light. While cones can able to differentiate between colors but need high intensity of light. In the case of objects seen by the eye in moonlight cones cannot operate and the brain cells receive signals from rod, therefore moonlight appears to be black and night vision. It is recommended to have a long exposure with color camera in moonlight; it would have all the colors as in daytime.

Human eyes are better when compared to cameras in compensating of low light. The lot of indoor objects that our eyes perceive to be well lighted to match with the upper limits of camera abilities. For filming in indoors, either a room with good artificial lightning should be choose, thus one can get best results when at maximum aperture is set. The aperture setting should be low for more light in the lens to enter in a camera. The lower aperture setting will result in least “depth of field”, and will have a great change in focus from object in the foreground.

Colours in moonlight

Explain why it is more difficult to see colours in moonlight than in sunlight.

Sun emitts lights of every wavelength.Red,orange,yellow,green,blue and violet are the visible lights.Every colour is found in sunlight and each colour is recognized by own wavelength.Human eye can detect colors whose wavelengths range from 380nm to750nm.

Moonlight is the reflection of sunlight.So moonlight is the same colour as sunlight but lot dimmer.Sensitivity to colours of eyes is greater than light intensity.To human eyes, colours appear desaturated when the light is very low.Moonlight gives insufficient light for eyes to perceive color.Light is focused on the retina of the eye by the lens.Retina cotains two types of nerve cells-rods and cones.Rods deals with brightness and cone is with colours.The sensitive cells react to light and their interaction sends message to the brain.Then brain can indicate colours.Rods detect intensity of light and can do anything for detecting colours.Cone is sensitive to different wavelengths or colours.The rods sense intensity and are unable to detect colours, they can operate at very low intensities of light.On the other side, the cones detect colors apart but need quite high intensities of light .

So the difference of light intensity and eye function causes difficult to see colours in moonlight than in sunlight.

Light reflection on CD

Explain the colours that are seen when light from a lamp is reflected on a CD.

Light is made up of a collection of many colors. A compact disc is made of a polycarbonate wafer which is coated with a metallic film, usually an aluminum alloy and film is covered by a plastic polycarbonate coating. The coatings are very thin less than 100nm thick and each coating partially reflects and also partially transmits incident light. Light is made of waves-like the waves in the ocean. When light waves reflect off the ridges on CD, they overlap and interfere with each other. Sometimes the waves add together, making certain colours brighter, and sometimes they cancel each other, taking certain colours away.

When light from a lamp is reflected on a CD light rays reflected from different coating boundaries interfere with each other to produce the colorful patterns. The reflectance of the CD is not uniform, because CD disk contains a long string of pits written helically on the disk. Like water drops in falling rain, the CD separates white light into all the colours that make it up. The colours we see reflecting from a CD are interference colour, like the shifting colours on a soap bubble or an oil slick. The reflected light will make rainbow colours: red, orange, yellow, green, blue, indigo, violet. If the coatings thickness is very thin, then interference can occur. Violet light has a wavelength of about 4,000 angstroms (hundred-millionths of a centimeter), while red light has a wavelength of about 7,600 angstroms

Human vision color

In human vision color is reduced to 3 co-ordinates. Still, in most color printing, 4 colors are used. In high quality color print 7 colors are used. Explain the advantages of using 4 or 7 colors, when we can only see 3 colors.

From the electromagnetic energy spectrum, our eyes can detect the small portion of the wavelengths which is 380 nm to 770 nm. This range of wavelength is the visible light spectrum. The short wavelength of visible spectrum is blue and longer one is red. All the colors in nature we can see is in between blue and red. Red, Green and Blue are the primary colors. Something creates color by absorbing certain wavelengths of color while reflecting other wavelengths back to the viewer. Other way to produce color is when a particular source emits only certain wavelengths.

Retina is the light sensitive tissue in human eyes. It is consists of rods and cones. Rods functions in less intense light and cones in bright light. There are three kinds of cones-red absorbing cones that absorb long wavelength light, green absorbing cones that absorb middle wavelength light and blue absorbing cones that absorb short wavelength light. Human eyes define a color by perceptual attributes of brightness, hue and colorfulness.

Cyan, magenta and yellow are the secondary colors in between three primary colors. The additive combination of two primary colors in proportion gives the perception of a secondary color. Red and green yields yellow, blue and red yields magenta, blue and green yields cyan and other colors can form this way. In printing, color is defined in terms of reflectance and absorbance of cyan, magenta, yellow and black inks on the paper. In 4 color printing- cyan, magenta, yellow and black inks are used which act as filters and subtract portions of the white light strike the image on paper to produce other colors. Paper reflects unabsorbed light back to the viewer.

Color printing gives a reproduction of an image or text in color. In 4 or 7 color printing, the color used is the different proportion of RGB and give rise to the visual sensations of all other colors.

Colour of Sun,Moon and Stars

Discuss the differences in colour between the sun, the moon and the stars.

We know that sun has its own light. Its light is inherited by the moon and stars. As moon reflects sunlight and does not have an atmosphere so the colour of the moon and the sun should have been same. We also know that the sun radiates at a surface temp of about 5780K. This means its light is white. Although it looks yellow from here on Earth, the light of the Sun would actually look very white from space. But if blue is scattered in the atmosphere it will be scattered for both sunlight and moonlight. The moon is slightly yellowish at night. And on the other hand moon light is usually white.

The moon is yellow at night because if were to pin the colour output to a spectrometer we'd see it yellow. But there are two more things that make it appear different from the daytime sun: a) the colour is more diffuse through scattering of the surface on the dusty moon and our atmosphere b) our eye have very poor colour perception in dim lighting or from dim lighted sources. So if we combine diffuse light with poor perception of dim light sources, it’s not that much of a stretch to see that our eyes perceive it to be less than yellow in colour. During the daytime though, if the moon appears white, it has more to do with the combination of blue sky that overwhelms any perception of the dim, diffuse yellow that the moon might be reflecting.

At first glance, the stars may appear to all be white, but if we look at them from dark skies for any amount of time, we will see they are a diverse variety of colours which are red, yellow, white, and blue. Stars are such of these different colors depending on how hot they are that means on its surface temperature. Star work in the same way as a fire does. The coolest part of the fire is the top where the flames are red. It is hotter in the middle where it glows yellow while the hottest part is near the fuel where it glows blue. Therefore some of the hottest stars are blue and are called Blue Giants. The biggest known stars are called Supergiants. Rigel is blue Supergiant which is over 100 times bigger than the sun. Yellow stars like the sun are a bit cooler, and are called Yellow Dwarfs. Red Dwarf stars are smaller and cooler than the sun.

Good Frame Speed Cameras

To Capture a moving object we need a good frame speed camera. When object is moving at different velocities we take different frame per second and it is related to the camera shutter speed.

To capture a moving object by camera we need to concentrate on the camera shutter, Shutter - It open and closes to control the length of time light strikes the film. There are two types of shutters: a leaf shutter, located between or just behind the lens elements, and a focal plane shutter, located in front of the film plane. shutter speed of the cameraWhenever the subject is moving, the choice of shutter becomes an important consideration in creating the impression of movement in a still image. Shutter Speed Control - This know controls the length of time the shutter remains open. Typical shutter speeds are measured in fractions of a second, such as: 1/30 1/60 1/125 1/250 1/500 and 1/1000 of a second.

And we have to concentrate on frames per second calculation Frames per second or the more general frame rate refers to the number of individual frames being photographed each second. The professional frame rate is 24 fps; that is, 24 individual photographs are recorded per second. Many cameras come with several frame rates,

If at all we have to capture the moving object we need at least 5 frames per seconds speed camera.

In 5 frames per second speed when the object is placed 1meter far from the camera the camera covers 2meter of wide area.

Here we have object of 1cm and it is placed 1m far from the camera and object is moving at different velocities 10m/s ,100m/s, 1000m/s so by calculating we can find the different frame rates for the object moving at different velocities

For 10m/s velocity, we have 1cm object, distance between object and camera is 1m so the wide area covered by the camera is 2m. 2m=2000cm/s

10*1000 = 10000cm/s

10000/2000 = 5 frames per second we need

For 100m/s

100*1000 = 100000cm/s

100000/2000 = 50 frames per second we need

For 1000m/s

1000*1000 = 1000000cm/s

1000000/2000 = 500 frames per second we need

So the equipment we need is good frame speed camera and the frames are get adjusted according to the speed of the moving object.

First and foremost, your shutter speed is crucial when capturing moving objects. It’s advisable to use a fast shutter speed when you want to get a very good focus on your subject. Using a slow shutter speed, will only blur your object.

Stars Twinkle

Stars twinkle due to turbulence in the Earth's atmosphere. Thick layers of turbulent , it is an moving air in the earth’s surface.

Since the atmosphere is made up of several layers, each layer has a different temperature and density, and as the light from a star passes through the atmosphere, it bends through each layer and this is what we recive as twinkling.

We see this because of light's passage through layers of air with differing temperatures, pressures, densities, moisture content and other factors. All of them will have a subtle effect on the light, and it will "waver" a bit so that we get a "twinkle" when we look at the stars. Temperature differences are well known for distorting light, and the "heat waves" we see when objects are viewed through air with differing temperatures in the path of the light are things we can generally recall. On a hot day, air above the heated surface of a dark colored vehicle appears to "shimmer" because of the "heat" rising from the vehicle.

Light from the stars came a long way to get here for us to see it, but it is its passage through earth's atmosphere that gives it the greatest difficulty. And we see the difficulty the light has getting through the atmosphere 'cause it just can't stay in a straight line. The small "shifts" the light takes in its travel appear as the "twinkle" of the stars.

The apparent twinkling of stars is actually caused by our atmosphere. As light passes through it, it is slightly interfered with. The lower a star is, the more atmosphere its light is having to pass through, so stars nearer the horizon seem to twinkle a lot more than those higher up or overhead.

Auto Focus in Cameras

Auto Focus - The camera will automatically focus the lens for a sharper picture and it helps to improve the quality of the pictures.

The working of auto focus in camera, we have small computer operated motors to move lens to get sharper images in this procedure the lens in the camera will move in and out till they calculate the distance from the object to get the sharper image. To calculate the distance from the object to camera, the infrared signal will be sent from the camera’s emitter, and when the infrared signal reflect back the camera will detect the signal and measures the intensity of infrared of light bounced back and measures the amount of time it takes to reflect back from object and the microprocessor in the camera will calculate the time and set the lens in the suitable position to capture the sharper image, this procedure is called active autofocus. today's cameras uses an infrared signal, and is great for subjects within 20 feet (6 m).

In this auto focus system we have passive systems, in this passive system to calculate the distance form the object we use the computer analysis of the image it self. This type of systems we can find in single lens reflex ( SLR) cameras with inter changeable lenses, and uses sensors that compute the contrast of the image. In this camera uses charge coupled device(CCD) to see light from the scene in this CCD we have strip of 100 to 200 pixels . In this passive system the camera continuously adjust the lens to capture the sharper image, the microprocessor searches for the greatest difference in intensity between lights and darks in adjacent pixels. This system will read vertical objects, so you should focus on a vertical edge like face of person or we can hold the camera in the vertical position for the horizontal objects like mountains. Now days we have a new cameras sensors which can focus on both vertical and horizontal objects.

Before the discovery of the auto focus cameras the people were using the manual focusing to get the sharpest picture and normal lens which are fixed in the cameras and not much expensive which gives the normal image.

We haves some defects with the auto focus system in cameras, In active auto focusing system the infrared sensing can get confused like if we take picture through window the infrared ray will reflect back because of the glass in the window and open flames in front of the camera like birth day candles can also confuse the sensors and drake surface will absorb the infrared ray.