The Parts Of A Crawler-Based Search Engine

Crawler-based search engines have three major elements. First is the spider, also called the crawler. The spider visits a web page, reads it, and then follows links to other pages within the site. This is what it means when someone refers to a site being "spidered" or "crawled." The spider returns to the site on a regular basis, such as every month or two, to look for changes.
Everything the spider finds goes into the second part of the search engine, the index. The index, sometimes called the catalog, is like a giant book containing a copy of every web page that the spider finds. If a web page changes, then this book is updated with new information.
Sometimes it can take a while for new pages or changes that the spider finds to be added to the index. Thus, a web page may have been "spidered" but not yet "indexed." Until it is indexed -- added to the index -- it is not available to those searching with the search engine.

Search engine software is the third part of a search engine. This is the program that sifts through the millions of pages recorded in the index to find matches to a search and rank them in order of what it believes is most relevant. You can learn more about how search engine software ranks web pages on the aptly-named How Search Engines Rank Web Pages page.

hybrid

Most of these involve the coupling of an engine, an electric motor and sometimes batteries, in various different ways to allow excess energy that would otherwise have been lost, to be stored in the vehicle. Energy is created by activities such as braking and descending hills, or by running the engine at its most efficient while the stored electrical energy takes up the variations in required power. This can improve the vehicle efficiency and fuel consumption dramatically. Many manufacturers are running development work on such systems. So far hybrids are more expensive and heavier than normal engines but offer the chance to downsize to obtain the same power. This type of system is also likely to drive the need for more efficient turbochargers.

Hybrid engines.

Double the gains: the intelligent combination of a combustion engine and electric motors aims to save fuel and reduce emissions, while simultaneously improving dynamic performance and driving comfort.

Hybrid comes from the Latin and describes something of mixed origin or comprising different elements. With reference to vehicles, it denotes one that uses two different drive systems - generally a combination of a combustion engine and an electric motor. In a mild hybrid, the electric motor only assists the internal combustion engine. In a full hybrid, an internal combustion engine is combined with a relatively large electric motor. This motor is powerful enough to drive the car on its own, at low speeds.
For BMW, the term hybrid represents something more than simply integrating an electric motor. It represents the intelligent management of energy flows within the vehicle. Modern hybrid drives aim to save fuel and reduce emissions, while simultaneously improving dynamic performance. Based on a modular hybrid drive system, optimally chosen hybrid components are integrated into each vehicle so that they can be used as and when they are needed. BMW ActiveHybrid represents all future BMW hybrid technologies and plays a major role in BMW EfficientDynamics.

Hybrid electric vehicle

A hybrid electric vehicle (HEV) is a type of hybrid vehicle and electric vehicle which combines a conventional internal combustion engine (ICE) propulsion system with an electric propulsion system. The presence of the electric powertrain is intended to achieve either better fuel economy than a conventional vehicle, or better performance. A variety of types of HEV exist, and the degree to which they function as EVs varies as well. The most common form of HEV is the hybrid electric car, although hybrid electric trucks (pickups and tractors) and buses also exist.

Modern HEVs make use of efficiency-improving technologies such as regenerative braking, which converts the vehicle's kinetic energy into battery-replenishing electric energy, rather than wasting it as heat energy as conventional brakes do. Some varieties of HEVs use their internal combustion engine to generate electricity by spinning an electrical generator (this combination is known as a motor-generator), to either recharge their batteries or to directly power the electric drive motors. Many HEVs reduce idle emissions by shutting down the ICE at idle and restarting it when needed; this is known as a start-stop system. A hybrid-electric produces less emissions from its ICE than a comparably-sized gasoline car, since an HEV's gasoline engine is usually smaller than a comparably-sized pure gasoline-burning vehicle (natural gas and propane fuels produce lower emissions) and if not used to directly drive the car, can be geared to run at maximum efficiency, further improving fuel economy.

The Cost of Hybrid Cars

Hybrid-engineered cars cost a bit more too. Usually the price difference is around 3,000 bucks. And, it may take a few years (depending on gas prices) for you to actually make the savings in fuel worthwhile. However, it's still better for the environment, and that lingers (and makes it worthwhile) in some consumers' minds.

And, if you are still one to wholeheartedly grip the stick of your V-8 without budging, you might take into mind that newer hybrid models are gaining on those petal-to-the-metal peelers of yesteryear. Hybrid models are inching nearer to (and even beating!) gas powered cars in 0 to 60 mph road tests.
So, when you decide that a new car might be a viable option in the near future, don't expect to see too many hybrids in dealers' lots. You may have to do some across-the-state driving to find a choice. Do some preliminary searching on the Internet and find out what model may benefit you and your lifestyle the most. Keep in mind all that we've mentioned and perhaps-in the future-you'll have no other choice than a hybrid, which at this time seems to be by far the best choice around.

Read more: Hybrid Engines - A Brief Description of Hybrid Engines and their Benefits
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Small Price Hike

The second hybrid is often referred to as a series hybrid. In a series hybrid, the gas or diesel powered engine doesn't connect to the transmission directly, meaning that it doesn't actually propel the car by itself. It actually works indirectly, powering a generator, which in turn (controlled by computer monitoring systems) either feeds power to the batteries or directly feeds power to an electric motor that connects to the transmission.
As stated above, hybrid buyers are looking for the combination (and compromise) of power and energy that these cars seem to provide. Many gas-powered cars have a lot of horsepower. This is useful for modern driving experiences. No one wants to be doing the minimum 45 mph on the interstate and stopping to "refuel," as with purely electric motors. Plus, there's no need to feel like you should have placed your slow-moving reflective magnet on the trunk. However, many gas-powered cars are truly "wasteful" resources because out of those 175 horses, you'll only have to use less than half that power for everyday driving. We don't even have to get into the harmful environmental factors of pure gasoline engines. We are just now starting to see the results of our apathetic attitudes on this subject.
The engines in hybrid automobiles are usually much smaller (except in some brand new V-6 models). While this reduces fuel consumption, it means that for the extra "power" that drivers are looking for has to come from somewhere else. That's where the electric motor and batteries come into play. In some models, sensors detect that the car is in need of extra energy for going up hill, for example. That's when the "hybrid" half of the engine kicks in. It will do a dandy job of giving the engine that extra oomph or boost that it needs, without using any more gasoline.
Newer hybrid models do a lot of extra tricks so that your car gets as many miles to the gallon as possible. For example, when you're stopped at a traffic light, another sensor will trigger the gasoline engine to idle down to a complete stop, while the car stays "running" solely on its electric power. Did I mention ingenious?
Since the idea behind the hybrid powered car is reduced fuel consumption without the loss of speed or power, many cars are being designed to move through the streets with the utmost in aerodynamic form; meaning that a hybrid will create less "drag," simply due to its body structure. Many also use much lighter building materials, reducing weight and pull. Some models even have wheel covers and no mirrors (replaced with cameras and navigation equipment), which saves an enormous amount of energy.
Hybrids don't seem to be a fad or some social experiment. Consumers and car enthusiasts alike are enjoying what they're seeing in the market. Everyday it seems a better designed, lighter; more fuel-efficient and powerful hybrid enters. Recently released models are even beating their gas-powered counterparts. One boasts a 255 hp engine with other capabilities such as being able to shut down half the cylinders (without notice) while in motion to conserve fuel and energy.

Read more: Hybrid Engines - A Brief Description of Hybrid Engines and their Benefits
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Hybrid Hype and a Small Price Hike

Drive by any car lot in the United States and ask to see the latest hybrid car models. Don't be stupefied if eight out of ten tell you that they can't seem to keep them on the lot-that they're just selling too fast! There is reasoning behind the hype: consumers believe in one (or all) of three things, that they're going to be getting a better deal once gas prices hit $2.50 a gallon, that they're not sacrificing performance and that they're helping the environment.
Let's first take a look at how these cars are put together. First, we have to understand the concept of "hybrid". A hybrid car might be defined as any vehicle that uses two or more sources of energy to propel itself. Seems simple enough. Hybrid machinery is all around us in the form of diesel-electric, such as city buses, and nuclear-electric, such as those used on many US submarines. So, the idea and the technology have been around awhile-it's just now that another energy scare like that of the 1970s, that we start becoming resourceful and a little ingenious. Hybrid power is on the up-rise (and in-demand) only because the two different types of propulsion possibilities (gasoline/diesel and electric) standing alone have proven an ineffective means to get both power and efficiency in one package. But, working together, there is promise.

Read more: Hybrid Engines - A Brief Description of Hybrid Engines and their Benefits
http://www.whatprice.co.uk