Author: blogger
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.
Although there are many types of boating electronics, there are really only three boat electronics basics that are necessary to enhance safety and make boating more enjoyable. You should begin with a VHF marine radio, a GPS system, and a fish finder.
Marine VHF Radios
Although boats that are less than 65 feet in length don’t have to include VHF radios, everyone should actuallly have this equipment. Those who plan to go more than a couple of miles off shore should seriously consider adding an HF or single side band mobile satellite phone or radiotelephone, along with an EPIRB (emergency position indicating radio beacon), and a back-up VHF radio or cell phone too. The satellite phones are becoming more reasonably priced, and give easier conversations than the popular HF radio phone, but the High Frequency phone will also pick up weather warnings. You can have these boating electronics without having an FCC ship station license, unless you plan on making international voyages. On your VHF radio, you have to maintain a watch on channel 16 or VHF channel 9, the boater calling channel. Urgent data, like storm warnings, are broadcast on channel 9 only in some waters.
GPS Systems
If you have a Global Positioning Satellite receiver for your car or for hiking, then you know just how useful they can be. You can get GPS systems that are portable or mounted on your boat. Some people prefer to have one handheld GPS for use on the road and on the water. those boating electronics devices weigh less than half a pound and are tiny and easy to install. All you do is install batteries, turn it on, and go outside. The device will automatically determine your location, with accuracy of about three meters. A backlit LCD display shows your position on a map, and most units come with built-in maps covering major roads, rail lines, rivers, and lakes in the US and Canada. Many of those automatically include recording of waypoints so you can find your way back fairly easily, and are compatible with computers, so you can include extra maps if necessary.
Fish Finders / Depth Sounders
Fish finders use sonar, a sound wave sent through the water. The diameter of the sound wave increases as it travels through water, and when it encounters a solid object within the cone formed by the sound wave, it bounces back to the transducer and records the shape of the object and the depth. Fish finders can be both mounted or handheld. The mounted ones are generally more expensive and are available in dual frequency models, which allow more accurate fish to depth readings.
Combination Units
You can buy units that combine GPS and fish finders. These have the advantage of generally saving money over buying separate units, and they are usually console mounted equipment.
Buying your boat is very exciting, and you definitely want to use it at the first opportunity, but you must make sure it is outfitted with the necessary safety equipment, and you’ll surely want boat electronics that will make using your boat more enjoyable. To start out, a VHF marine radio is highly recommended for safety purposes. Beyond that, a GPS system for easy navigation, and a fish finder complete the basics that will help you out on the water enjoying your vessel as soon as possible
A number of conferences dealing with electronic technology occur on a regular basis. Two of these are the Digital Book World Conference and the Consumer Electronics Show.
The Digital Book World Conference, a conference on publishing and digital change, is for all book-publishing professionals. This includes senior management, editors, agents, marketers, digital strategists, and others. It is unique in that it helps publishers address business challenges created by digital change.
The first annual Digital Book World Conference took place in New York City January 26-27, 2010 at the Sheraton Hotel and Towers. Planners of the conference conceived the idea in June, put together the Conference Council in July, and drafted the initial program in August. They geared panels and talks towards the changing digital book business. It had three main themes: Evolving the Business Model, EBooks: Opportunity or Threat, and Marketing in the Digital Age. Topics discussed included management of digital rights, pricing of eBooks, and timing of eBook releases. The goal was to provide an outstanding program with expert speakers for attendees to takeaway practical ideas, and to include sponsors and exhibitors capable of offering appropriate tools for implementing the strategies individuals learned about at the conference.
Attendees were professionals from five continents representing more than 240 publishing companies including Amazon.com Digital, Barnes&Noble.com, Crown Publishing Group, Google, HarperCollins, Macmillan, National Geographic Society, Oxford University Press, Princeton University Press, Random House, as well as many others. Individuals from all areas of book acquisition, production, and distribution were present at the conference. Among them were CEOS, Senior Agents, Directors of Marketing & Sales, Editorial Directors, Directors of Strategic Partnerships, and Directors of Digital Assets.
The second annual conference, Digital Book World 2011, coming up January 24-26, will again be held at the Sheraton Hotel and Towers in New York City. The theme this year is Managing Risks; Seizing Opportunities. On Monday, January 24, conference attendees can participate in three-hour workshops in the areas of eBook Design and Production, Content Strategy and Transmedia Development, and Direct-to-Consumer Marketing and Sales.
Planning for this years conference is well ahead of last years schedule. As they plan for the upcoming conference organizers need to predict what the relevant digital change questions will be and what will be relevant to the target audience of book-publishing professionals in January 2011.
The Conference Council, a group of about 30 made up of CEOs, representatives from large and small publishing houses, retailers, digital strategists, retailers, and independent leaders, will plan the programs and choose speakers who will address the relevant issues and problems that trade publishers are facing as they move into digital publishing. Not only is the technology of e-readers progressing rapidly, but e-Ink technology is improving alongside it opening new horizons for digital reading. According to the review “What’s Next in e-Ink Technology”, the new generation color E Ink products are certainly crisper and offer better resolution and color reproduction that anything else seen to date and we expect to see electronic ink begin to compete with LCD displays (Digital Book Readers).
Another conference, the International Consumer Electronics Show (CES) is held each year in Las Vegas, Nevada. The Consumer Electronics Association (CEA) puts on this technology-related trade show, which is not open to the public. Attendees must have a professional affiliation with consumer electronics. The CEA reinvests all profits from the show. They go towards such things as industry promotion and services, technical training and education, development of engineering standards, and legislative advocacy.
Originally, in 1967, CES was held in New York. Then in 1978, it started being held twice a year. In 1998 the show once again changed and went back to the once a year format. The CES gained popularity in 2004 after Comdex was cancelled.
The 2010 Consumer Electronics Show, held January 7-10, had an attendance of more than 120,000. The most impressive e-book readers at the show were Skiff Reader and Plastic Logic Que proReader touchscreen devices with integrated 3G. Also at that show, several companies announced 3D-compatible HDTVs and four companies announced standalone 3D Blu-ray players. Intel demonstrated a new Wireless Display technology (WiDi), and Motorola introduced the new Backflip Smartphone.
The next CES, January 6-9, 2011, will have more than 300 conference sessions covering every aspect of the consumer electronics industry. The full conference lineup will be available October 1, 2010.
Selling things online is a great way to make some extra money from home, but setting up an e-commerce store isn’t for the faint hearted. It requires a huge investment of time and money, and you can end up with nothing to show for it in the end. If you want to make some easy money online, there is one way that you can do it without having to pay a cent, or invest more than a minute of your time.
It might sound too good to be true, but it isn’t. The used electronics market is huge on the internet, and used electronics dealers always need fresh stock. This means that if you’re one of the millions of people with unwanted cell phones, iPhones, laptops, or other devices in your home, you can make a ton of extra cash by learning to sell electronics online. There are some serious advantages to doing this versus holding on to your old electronics:
– Since you already own the things you’ll be selling, you won’t need to lay out a lot of money for stock the way you would with an e-commerce shop.
– Since you’ll be selling your devices to a dealer, you won’t need to deal with customers directly.
– When you sell electronics online, you get money in just a few days.
– Since you’ll be selling things through another company’s website, you won’t need to pay for things like web space or site designers.
– Holding on to your electronics doesn’t do anything for you. You’re unlikely to ever use them again, and you won’t get any money for them if they’re just hanging around your home.
So, how do you sell electronics online without having to pay anything? You do it through a used electronics dealer’s website. These companies will pay you money for your unwanted devices, no matter what kind of condition they’re in. Even a broken device, like a smartphone with a cracked screen or an iPad that just won’t turn on, is worth some money to the right person. Instead of having to be the one to find that right person, you can put your old, broken, or unwanted electronics into the hands of someone who will.
On a used electronics dealer’s website, you can get a price quote in twenty nine seconds. All you need to do is know your device’s brand and model, and have a good idea of what kind of working order it’s in. Be honest! You’ll be quoted more for a device that’s in perfect working order, but your device will be inspected once it’s received by the company. When you sell electronics online, you’ll be paid for the condition your electronics are actually in, so it’s in your best interest to tell the truth on the company’s website.
If you like the offer, the next step is to continue with the transaction by requesting a free mailer from them. You’ll be sent a special box or padded envelope that is already stamped with the necessary postage. So, not only to you not have to pay for stock to sell electronics online, you don’t need to pay for shipping, either. When your mailer arrives (most likely in a few days, depending on postal service in your area), you simply use it to mail your electronics in to the used electronics dealer.
The last step to sell electronics online is to wait to be contacted by the company buying your devices. They will confirm the condition and model of your electronics, and discuss payment options with you. In most cases, you’ll be able to take your payment as an online transfer, through a service like PayPal. If you prefer, you may also be able to take it in the form of a check or money order. You’ll get your payment a few days after that, and your electronics will be resold.
E-commerce sites are a great idea, but not everyone has the money and energy to invest in them. Instead of having to sell electronics online yourself, why not rely on experts in the field of selling electronics? Turn your unwanted devices over to the right company, and you’ll get to walk away with some fast cash with little to no effort.
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