Month: September 2018
It can be argued that the advent of the computer age and electronic documents is second in importance only to Johann Gutenbergs invention of the printing press in the 1450s. Once computers were firmly entrenched in the worlds offices in the early 1980s, it didnt take long for business people to start wondering whether electronic documents could become the primary means of communication. Futurists were quick to dream about the day when books would be presented strictly online as electronic documents, available to all and at much lower prices. Others saw electronic documents putting paper companies and many printers out of business.
While the reality of the electronic document revolution has panned out differently than the futurists predicted, the computer has brought extraordinary changes to communication. For example, the broad acceptance of electronic documents in everyday and business life has prompted the development of style guides and resources for citing electronic documents as references. Another sign of the impact of electronic documents is the arrival of the CIAs electronic reading room which citizens can visit online to read about items of national interest. Likewise, physicians are more and more frequently getting away from thick patient files and instead relying on electronic charts. This move to electronic documents reduces the chances of losing vital information and also dramatically cuts down the chance of prescription errors.
One challenge with electronic documents that has emerged in recent years is the discovery of the difference in pixels in an online document vs. a printed document. Companies like Microsoft are exploring ways to alter the pixel density of electronic documents to make them more eye friendly. As this science unfolds, society will be positioned to take another step toward a more paperless society.
Today, electronic documents are increasingly becoming the norm for handling personal business. More and more people each year do their banking and bill paying via electronic documents. It saves time, effort and postage. Plus, many contend that it is actually more secure than mailing a check from your mailbox and risking it being stolen.
Government itself feels strong pressure to move toward a more paperless society. The 1998 Government Paperwork Elimination Act demanded that government agencies refrain from using paper to create, modify or store official records within just four short years. This act, in and of itself, forced the government to begin accepting electronic payments and signatures. The age of electronic documents achieved a new milestone!
Today what is classified as an electronic document has expanded to include a wide range of items such as emails, photographs, letters, depositions, x-rays, claims, medical records, video clips and even voice mail. Today, organizations use Document Management Systems to organize and manage these electronic documents. With the addition of each item, the move toward a paperless society again takes a step forward.
All this being said, most experts believe that we will never become a fully paperless society. There will always be those who want to print out a document and hold it in their hands. However, as people become more comfortable with the convenience of electronic commerce, finance and communication, more and more of our lives will be handled through electronic documents and our society will, as a result, become increasingly paperless.
What was the flybar for anyway? The flybar performs three basic functions stabilization, amplificationof cyclic input, and resistance to pitch up in forward flight.
Stabilization: While hovering a wind gust may try and move (tilt) the main rotor. The flybar will be differently (less) affected, and the linkage system will adjust the pitch on the blades to resist the change.
Amplification of cyclic input: When the swashplate tilts and moves the flybar, aerodynamic forcesimposed by the flybar paddles change the spinning plane of the flybar, and again through a series oflinkages this then changes the pitch on the main rotor blades. This means the servos work less hard toachieve a cyclic input.
Resistance to pitch up in forward flight: In fast forward flight the blade advancing into the airflowcreates more lift than the blade retreating in the airflow. This causes a pitch up motion of the helicopter.The flybar again tries keeping in its own plane of rotation, and through the linkage system adjusts thepitch on the main blades to resist this change.
So the electronic components of the system take over these tasks from the flybarSo why ditch the flybar and change to a flybarless head setup?Flybarless helicopters have arguably better all round aerobatic performance. But they are also great forscale models, aerial photography platforms, etc
Advantages include:
Less rotating mass
Lower drag
Combination of longer flight time and better 3D performance
Less mechanical complexity
Infinitely tunable flight characteristics, including improved stability if desired
Looks cool!
What is required:
The Flybarless Head Itself It is ideal to purchase a custom designed flybarless head for your size of helicopter rather than try and modify an existing setup. There are several reasons for this:
The geometry of the head is important
You are purchasing a product that is known to work
Flybarless Electronics You require a system to take over the role of the flybar. There are two and three axis units on the market. For general flying a two axis unit (meaning you still require your own tail gyro) works very well. For 3D flying there are advantages of three axis units, however the two axis ones still hold their own.A two axis unit essentially contains two heading hold gyros (left/right and fore/aft cyclic). A three axis unit adds a tail rotor gyro also. Much like the way a traditional tail rotor heading hold gyro works, the cyclic gyros have the ability to stabilize the rotor head from wind gusts, etc.It is possible to fly a flybarless helicopter without electronic stabilization. However, the task is much easier with the help of an electronics package. You would not fly your helicopter without a tail gyro, would you?
Servo Selection Fast digital servos are preferable. But again, depending on your flying style,any reasonable servo will allow you to experience the flybarless feel.
In Flight: Flybarless helis can be set up to behave in an almost unlimited number of ways. With a flybar,it was time consuming (and expensive) to try a variety of flybar lengths, different paddles, and flybarweights. With the electronic flybar it is simply a matter of changing some of the programmableparameters in the unit itself and you have a whole new feel to the helicopter.There are some further flight differences with a flybarless heli. The cyclic controls now command acyclic rate from the rotor head. So if the helicopter is on the ground and even a small cyclic command isheld, the cyclic servos may move hard over to try and achieve the commanded cyclic rate. So it isimportant not to add cyclic control until the helicopter has lifted off.Autorotation performance is overall improved, but somewhat of a different technique is required torealize this increase in performance.
Though the economy is still sluggish, most shoppers are saying that they intend to spend more on holiday gifts this year than they did in the past few years. You can bet that a majority of these gifts will tend to be in the electronics arena. From video game consoles to video games to gadgets to portable audio and video players, there is no shortage of choices if you are in a buying mood this holiday season.
One of the hottest devices that you can consider as a gift for your loved one would be Apples latest creation, the iPad. People are amazed by the crystal clear screen and the myriad of applications available for it. You can view video, listen to audio, read books, play games and so much more. With over 100,000 applications in the Apple App Store, the possibilities and uses for this product are virtually endless. The iPad isn’t just a bigger version of the iPhone either, it boasts it’s own application set, and special functions, including a much more usable keyboard than it’s smaller counterpart. This feature makes the iPad much more of a personal, portable computer, and practically leaves technology like netbooks in the dust. Ease of use has always been a strength of Apple’s products, and the iPad is no exception. People of any age, even people in their 90’s can use it without any learning curve whatsoever.
If youre into mobile phones, another great idea came from Apple. Released earlier this year, the iPhone4 has instantly become another Apple hit because of its trademark style and functionality. This is actually a major upgrade of the iPhone 3G in such a way that it boasts of its highly sensitive touch screen and amazing screen resolution. The iPhone4 can be a great gift this Christmas, especially if you bundle it with service. However, a new phone may not always be an appropriate gift, which is why the newest version of the iPod Touch may be a better choice. The iPod Touch has just about all the functionality of an iPhone, but without the phone function. The iPod Touch is also less expensive.
Those are two of the hottest electronics gifts this season, but you may also consider an LED television, a 3D television, the Playstation Move, the XBOX360 Kinect, a GPS device, exercise or outdoor equipment or any of hundreds of hot video games for those who already have a video game console.
The global consumer electronics market is home to many consumer electronics countries, which have been successful in establishing themselves as consumer electronics giants. According to our new report, Global Consumer Electronics Market Outlook 2015, China is expected to become a leader in the global consumer electronics market, with its sales surpassing that of US by 2014. China is expected to dominate the market in the coming years on account of various factors supporting its growth.
The flourishing Chinese consumer electronics market has been backed by favorable demand, rapid technological development, and strong government support. The government has supported the market by spreading awareness about energy conservation and providing subsidies to the manufacturers to foster production of energy-efficient products. Further, the report also revealed that the shrinking urban and rural divide with the improvements in the per capita income of people coupled with changes in preferences of the people have led to a booming market for tablets and smartphones in the country. It has also identified the key players in Chinese market that have made significant contribution to the consumer electronics market. Moreover, the Chinese consumer electronics market has been forecast till 2015 to present a brief overview of the market performance in the future.
The report, Global Consumer Electronics Market Outlook 2015, also provides a detailed insight on the consumer electronics market for other major countries. Further, the performance of various products along with their respective segments has been presented in the report in order to give a clear picture of the products which would drive the market growth in future. It also discusses about the major challenges and trends that would affect the global consumer electronics market, with a focus on major players on a global platform.
For FREE SAMPLE of this report visit: http://www.rncos.com/Report/IM471.htm
Some of our Related Reports are:
– Global Semiconductor Market Forecast to 2015 (http://www.rncos.com/Report/IM391.htm)
– Global Consumer Electronics Market Forecast to 2013 (http://www.rncos.com/Report/IM260.htm)
– Booming Consumer Electronics Market in India (http://www.rncos.com/Report/IM157.htm)
Check Related REPORTS on: http://www.rncos.com/Computer%20&%20electronics.htm
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The curvature of earth produces two effects firstly it reduces the difference in the path lengths between the direct and ground reflected waves by raising the point of reflection above that of a plane earth and as a result tends to reduce the strength of the received field, secondly curvature of the earth causes the reflection at the ground to take place from a spherical rather than a flat surface so that the reflected ray becomes divergent and consequently becomes weaker at the receiving point. This tends to increase the field strength of the total space wave at the receiving point. These two opposite effects produced by the earths curvature almost neutralize each other. As a consequence, the assumption of a plane earth yields results which remain valid in spite of considerable curvature of earth. The condition in the troposphere keeps on changing with time. Hence the amount of bending of refraction of waves also changes from time to time. This influences the relative path length of the direct and the ground reflected components of space wave. Hence the field strength of the resultant space wave at the receiving point changes, i.e. fading of the wave results. Small but abrupt discontinuities in the dielectric constant of air existing at the boundaries of air masses of widely different characteristics result in mirror like reflections. Such reflections may cause signal to be received at the points beyond the line of straight range. Fading may also be caused.
The distance traveled by the direct ray in the troposphere from transmitting antenna to the receiving antenna and the field strength of this direct ray at the receiving antenna. If the reflection at earth is prefect, the magnitude of the field strength due to ground reflected ray will be approximately equal since the total distance traveled by the indirect ray is approximately equal to the distance traveled by the ray. However the reflection co-efficient at the ground is p then the magnitude of the indirect ray is equal. The direct ray and the ground reflected ray combine vector ally at the receiving antenna. The phase difference in the two field strength is caused by the following two factors, path difference and phase shift caused due to reflection from ground. We revel, some important properties of the propagation of very high frequency. The field frequency strength increases linearly with the height of the transmitting antenna, linearly with the height of receiving antenna, linearly with the square root of the effectively radiated power. The field strength varies with the wave length and inversely with the square of the distance. In all we can say earths curvature has many effects on troposphere propagation.