Jumat, 05 November 2010

Digital Projector – Give A Bigger Picture

Digital projectors are those video projectors which are used in conferences for presentations. The digital projectors receive video signals from, usually, desktop computers and display images on large screens which can be easily comprehended by all in the gathering.

Two Types of Digital Projectors
To begin with, there are two technologies used by digital projectors, the older one being the LCD, liquid crystal display with independent transparent panels of LCD for each constituent primary color (red, blue and green.) The image transmission depends on the signal received by the projector from PC which redirects the light signals through these LCD panels and lens onto a screen. The LCD projectors look pretty similar to older slide projectors and are simple in construction and thus cost less in comparison to their successors DLP projectors. The LCD can be thought of as slides placed at the focal length of the lens making it complete. Clarity of picture in LCD projectors depends on the number of pixels it is set for. (Pixels are smallest area of data or picture holders)

DLP Projectors: The Latest of the Digital Projectors
Digital Light Processing or DLP is a technology developed by Texas Instruments in 1987. DLP projectors bring in a paradigm difference in technology in image projection to board rooms. Unlike their predecessors, DLP projectors make use of tiny mirrors or micro mirrors to reflect light images to pass through the projector lens and onto a screen. Each mirror can be thought of as representing a pixel. The mirrors reflect primary colors in rapidly rotating succession as actuated by a rotating color filter wheel. The image of rapidly changing colors ‘constructs’ images for human eye perception. The micro mirrors are collectively called as DMD or ‘digital micromirror device’.

For the sake of enhancing picture clarity, the rotating wheel is provided with a plain patch which allows plain white light. This type of DMD projectors are also known as single chip projectors. The three chip projectors are a bit complicated but offer better clarity. Here a prism splits the light from lamp into primary colors which are redirected to DMD which recombines them before projecting through the lens.

Where Is the Difference
DLP projectors are lighter and give far better pictures. Single chip resolves 16.7 colors while the three chip model does a, hold your breath, 35 trillion colors.

Commercial Models
Texas Instruments is the pioneer who owns the patent for DLP technology. Fraunhofer Institute of Dresden of Germany developed the same technology simultaneously and markets it as Spatial Light Modulators. HP, Samsung are other market leaders in both LCD and DLP technologies.

Kamis, 04 November 2010

Digital Photo Print Services Online - Is It Easier Than Printing Photos At Home?

Printing photos at home is expensive

Let’s cut right to the chase. What does it cost to print your own photos? Everybody likes the convenience of printing their own photos at home, but nobody is satisfied with the quality. I will show you that the cost is actually much higher and the quality is much lower when you print your own photos at home as opposed to having them printed by a professional developer. I will also let you know what a good alternative is. First, let’s look at the costs of doing your photos at home.

Cost of printing at home

Supplies and cost w/tax

Med. Quality Photo paper $19.66/100 sheets.

Color and B&W Ink $61.61.

Photo Printer $382.49.

Photo Editing Software $53.11.

Total cost $516.87.


Total cost per Photo $1.64.

WOW! That is expensive

Before you say I am crazy I will prove that these are conservative costs. The medium quality photo paper was priced on clearance at Office Max. The monotone and color cartridges were priced as a combo deal. The photo printer was the PSC 950 which is in most regards a cheap printer. Last but not least the editing software was not Adobe Photoshop which can cost over $500. It was a cheap Microsoft version that will do simple editing on images and video.

This is also assuming that you only print 10 photos per week, and that you only use your printer and software for two years. If we used a more realistic number for instance 10 photos per month then the cost per photo would go up to $3.04. For the ink I used 60 full color sheets per set of cartridges. I have never been able to print over 20. With other printing on that same printer I only got about 8 full pages out of the cartridges. The pictures were so bad that they ended up in the garbage. So the prices of photos can range from $1.64 per photo to over $3. Pretty costly for prints that you cannot display or hang on your walls.

Printing them online and having them mailed or picked up costs much less?

How about uploading your pictures to a professional and having them ready to pick up in one hour? Or uploading them to a professional and having quality prints mailed to you for prices as low as 12 cents per print?

Rabu, 03 November 2010

Digital Cameras - Explained

Over the last few years, the picture quality in digital cameras has becoming amazing. As recently as the year 2000, even the very best digital cameras you could buy produced grainy, poor-quality images that could never compare to what film had to offer. Today, though, digital cameras can easily rival and even exceed the quality of film, capturing pin-sharp digital images and never needing to be refilled with anything except power.

When you buy a digital camera, the most important thing you should look for is how many mega pixels (million pixels in the image) the photos it takes are. Cameras available today range from about 3MP at the low end to 10MP or more at the high end, with the price increasing steadily with each extra mega pixel.

However, how many mega pixels the camera has is not the only thing you should consider. Battery life is very important, as cameras with a short battery life can be frustratingly unusable, and the presence of various features in the camera’s software like auto focus and digital zoom should also be a consideration, as well as the camera’s ability to record non-photographic material like sound and video.

Ultimately, the best thing to do with digital cameras is to either buy the cheapest one you can find or a very high-end one – if you go for something mediocre, you will just be frustrated at having paid a lot of money for a camera that isn’t really all that great. If you are choosing between two cameras at a certain price point, it is almost always better to buy the one made by a known brand, as they will tend to have much better build quality, software and battery life, as well as being generally better-designed and easier to use.

As a final note, if you just want a cheap digital camera to take around with you and take occasional snaps of your friends and places you go, it’s well worth considering getting a mobile phone with a digital camera built in. As you take your phone around with you anyway, it’s no extra hassle to carry a camera phone, and the pictures they can take are rapidly increasing in quality, to the point where they are now where digital cameras were only a few years ago. As technology gets even better, a camera phone is increasingly becoming a very smart alternative to a digital camera for the casual user.

Selasa, 02 November 2010

Different Types Of Microscopes

Microscopes are mechanical devices used for viewing objects and materials so minute in size that they are undetectable by the naked eye. The process conducted with such an instrument, called Microscopy, uses the combined schools of optical science and light reflection, controlled and manipulated through lenses, to study small objects at close range.

The basic microscope consists of several complex and interrelated parts: a cylinder that provides a necessary space of air between the ocular lens (eye piece) situated at the top and the objective lens fixed at the bottom, hovering close to a stage containing an optical assembly on a rotating arm and a centered hole through which a light shines from a solid U-shaped stand beneath. Magnifying values for the ocular range through X5, X10, to X20, while the values for the objective lens has a broader span: X5, X10, X20, X40, X80, and X100. These values provide the observer with a spectrum of possible distance orientations and degrees of sharpness as are necessary for viewing and analysis.

Several different kinds of microscopes exist, each having particular features:

Optical Microscope: The first ever created. The optical microscope has one or two lenses that work to enlarge and enhance images placed between the lower-most lens and the light source.

Simple Optical Microscope—uses one lens, the convex lens, in the magnifying process. This kind of microscope was used by Anton Van Leeuwenhoek during the late-sixteen and early-seventeenth centuries, around the time that the microscope was invented.

Compound Optical Microscope—has two lenses, one for the eyepiece to serve the ocular perspective and one of short focal length for objective perspective. Multiple lenses work to minimize both chromatic and spherical aberrations so that the view is unobstructed and uncorrupted.


Stereo Microscope: This is also known as the Dissecting Microscope, and uses two separate optical shafts (for both eyes) to create a three-dimensional image of the object through two slightly different viewpoints. This kind of microscope conducts microsurgery, dissection, watch-making, small circuit board manufacturing, etc.

Inverted Microscope: This kind of microscope views objects from an inverted position than that of regular microscopes. The inverted microscope specializes in the study of cell cultures in liquid.

Petrographic Microscope: This kind of microscope features a polarizing filter, a rotating stage, and gypsum plate. Petrographic Microscopes specialize in the study of inorganic substances whose properties tend to alter through shifting perspective.

Pocket Microscope: This kind of microscope consists of a single shaft with an eye piece at one end and an adjustable objective lens at the other. This old-style microscope has a case for easy carry.

Electron Microscopes: This kind of microscope employs electron waves running parallel to a magnetic field providing higher resolution. Two Electron Microscopes are the Scanning Electron Microscope and the Transmission Electron Microscope.

Scanning Probe Microscope: This kind of microscope measures interaction between a physical probe and a sample to form a micrograph. Only surface data can be collected and analyzed from the sample. Types of Scanning Probe Microscopes include the Atomic Force Microscope, the Scanning Tunneling Microscope, the Electric Force Microscope, and the Magnetic Force Microscope.

Science wouldn’t be what it is today without the microscope, as this device is the primary instrument by which the world and all of its elements are measured and assessed. It is with the microscope that we take a look inside of ourselves so we can learn and understand who we are and how we work.

Leveraging Digital Information Products

PDFs, ebooks, audio files, video packages, and software programs are examples of digital information products. Like all products, they need to be manufactured, inventoried, and finally shipped to the buyer when the purchase is made.

Some advantages of digital products are that they can be stored easily on a variety of media like your hard disk, cd, dvd, or usb memory stick as well as delivered electronically anywhere in the world with an internet connection.

Traditional physical products incur significant expenses in production of inventory, storage, packaging and shipping that contribute to the reduction of your profit margin especially where there is competition.

On the other hand, the main expense incurred with digital products is in production. Storage and delivery advantages provide instant fulfillment to buyers and so can realize very high margins and profits.

While competitive advantage over traditional product lines are obvious, a new form of competition is emerging in the digital marketplace. The quantitative problem being solved by technology leaves only the quality to be measured or tested.

What all publications have in common is that they contain information and the quality of that information is discovered by reading. Unfortunately, digital products can be more difficult to evaluate without a table of contents to consider. Whether the publication is free or not, evaluation can be frustrating and the wrong choice lead to wasted time, effort, and sometimes money. Although refund guarantees are included with some packages, there is no refund of your time or effort.

What instant food did for kitchen prep time, digital ebooks are doing for business building. However, quality remains in the content or use value not the package. Unfortunately, the current trend appears weighted toward excellent sales and marketing techniques not content.

The extraordinary bonus and content bundles sometimes priced in the thousands of dollars are typically offered for a low one time payment usually less than a hundred dollars and is akin to the million dollar opportunity theories that in reality is quite different. In other words over delivery claims may significantly differ from actual content value.

To help mitigate diminishing return found in the gap between over-delivery-theory indicated by quantity and under-delivery-reality indicated by quality, I set up a site at h4h.biz to list exceptions to help leverage time in favor of the buyer and to stimulate content enrichment.

So far, low cost or free ebooks that are not produced in pdf format tend to be at least unavailable to some operating systems and frequently of low quality, content poor, or just dysfunctional.

To achieve the best results with your online business, focus efforts on finding digital products that you can promote that are of high quality and in a professional pdf package. Alternatively, you can produce your own ebook to expand your market by using a service like h4h.biz that offers professional pdf packaging. After all, content now appears to be the next great opportunity knocking.

Senin, 01 November 2010

Differences In Microphones For Your Stage Set-up

Using different types and manufacturers of microphones can make all the difference in the world when setting up a stage for your band. If you use the wrong one, you battle with feedback all night. Even if you use a feedback "eliminator", you will suffer very poor frequency response, because it is being "eliminated" as feedback, instead of the desired freguencies that make your music full and enjoyable.

Here are some things you should know, from the school of hard knocks, about microphones and their uses.

Types: There are many types of microphones available but they generally divide into three groups: dynamic, condenser and ribbon.

Dynamic microphones are the most common and the most basic types of microphones. They consist of a diaphragm attached to a coil that moves through a magnetic field inducing a small electrical signal. They operate using similar principals to a speaker and tend to have a limited frequency response, but are very rugged.

Condenser microphones have become more popular over the years because they have a very wide frequency response (tone) and are not as delicate or as expensive as ribbon microphones. They are, however, more delicate than dynamic microphones. They require a power source that can be an internal battery, an external power pack or phantom power that is provided by the mixer. They work by supplying a charge to a fixed plate that creates a capacitor. A thin diaphragm is mounted adjacent to the plate and induces voltage changes in the plate when subjected to sound vibrations.

Ribbon microphones produce sound by stretching a thin metal ribbon across a gap of a strong magnet. Sound moves the ribbon across the magnetic field creating electrical impulses. They have an excellent frequency response (tone) but tend to be very delicate and expensive. Since they are rarely used in basic P.A. systems, nothing more needs to be said about them.

Polar Patterns: This refers to the directions that the microphone will pickup sound from. Polar patterns tend to be divided into two types: omni and uni-directional.

Omni directional microphones are rarely used because they pick up sound from all directions and often pick up sound from directions you don’t want to have sound picked up from. Can you say...
... "FEEDBACK"...

Uni-directional microphones are the most common and probably total more than 95% of all microphones sold. They range from the shotgun, picking up sound from only straight in front of the microphone, to the cardioid, picking up sound from in front
of, or somewhat around the front of, the microphone in a heart shape pattern.

Knowing the pattern of a microphone is VERY important because it affects what area of sound that the microphone picks up from, as well as its susceptibility to feedback.

Sensitivity: This refers to the level of “hearing” that a microphone possesses.

The higher the sensitivity, the quieter the sounds that it will pick up. This is an important specification, especially dependant on your stage volume.

Impedance: This is important to know so that you buy the proper microphone to match your particular mixer. Although many mixers have inputs for both high and low impedance microphones, some only have one or the other. Generally speaking, if the microphone’s impedance is above 1,000 Ohms (1k Ohm) it is considered high impedance, otherwise it is considered low. Most professional microphones are low impedance and come with a cable with XLR connectors. High impedance microphones generally come with a cable with phone (1/4”) connectors. You can purchase matching transformers for 1/4" connectors that change the impedance of high level inputs, like guitars or keyboards, to low level, balanced inputs, to help eliminate ground loops and noise.

As you can see, chosing the correct microphone for your application can solve and enhance your performance and overall sound field from the stage. After all, your music, as represented by great sound, is what its all about.

LAN Service Contracts - Grab The Opportunity

If you've done a lot of research on computer consulting, you probably have information overload. In this article, you'll learn what steps to take when first starting your business of computer consulting.

Pick a Date

First, pick a definite date for launching your new computer consulting business and write it down: Launch date is ____/____/____. Why is that important? It gives you something to work towards, a concrete goal at which point you say you know you are starting your computer consulting business. Put the date on your calendar, whether it is six months from today or six weeks from today.

Narrow down your to-do lists and organize your tasks in top 10 priority. Write down everything that's floating around in your head and then go through that list and pick the 10 most important things.

Possible Top Ten Priorities

Your list might include:
· meeting with an accountant
· getting a business resale license
· opening up a distributor account
· picking a company name
· coming up with a business card
· looking through insurance options
· getting a Web site domain
· getting a business voice mail box

There are probably 30, 40, or even 50 things that are on your list. Narrow that down to the ten that you think are the most important to do before launching.

Order Your List

Once you get those 10, highlight them on paper and try to see if you can rank them in order of some kind of chronological order that makes sense to do. Just work on one or two a week. If you're a more analytical type and you think you work better on the screen, do this exercise in Microsoft Excel or do it in Microsoft Word. And then narrow your huge list down to your top 10 business priority tasks.

Develop a Timeline to Start Computer Consulting

Let's say you're launching your computer consulting business five weeks from now and you've got 10 things to do. Pick two things to do each week. It seems a lot more manageable when you put it in terms of that kind of time frame.

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