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Gears from a five-speed + reverse gearbox from the 1600 Volkswagen Golf (2009).

The gearbox in a wind turbine converts the slow, high-torque rotation of the turbine into much faster rotation of the electrical generator . These are much larger and more complicated than the PTO gearboxes in farm equipment. They weigh several tons and typically contain three stages to achieve an overall gear ratio from 40:1 to over 100:1, depending on the size of the turbine. (For aerodynamic and structural reasons, larger turbines have to turn more slowly, but the generators all have to rotate at similar speeds of several thousand .) The first stage of the gearbox is usually a planetary gear, for compactness, and to distribute the enormous torque of the turbine over more teeth of the low-speed shaft. [3] Durability of these gearboxes has been a serious problem for a long time. [4]

Regardless of where they are used, these simple transmissions all share an important feature: the gear ratio cannot be changed during use. It is fixed at the time the transmission is constructed.

For transmission types that overcome this issue, see Continuously variable transmission , also known as CVT.

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Many applications require the availability of multiple gear ratios . Often, this is to ease the starting and stopping of a mechanical system, though another important need is that of maintaining good fuel efficiency .

The need for a transmission in an automobile is a consequence of the characteristics of the internal combustion engine . Engines typically operate over a range of 600 to about 7000 (though this varies, and is typically less for diesel engines), while the car's wheels rotate between 0 rpm and around 1800 rpm.

Furthermore, the engine provides its highest torque and power outputs unevenly across the rev range resulting in a torque band and a OVERALLS Shortalls su YOOXCOM Rta Outlet Find Great Cheap Price Buy Discount Discount Outlet Store BjRdijEUO
. Often the greatest torque is required when the vehicle is moving from rest or traveling slowly, while maximum power is needed at high speed. Therefore, a system is required that transforms the engine's output so that it can supply high torque at low speeds, but also operate at highway speeds with the motor still operating within its limits. Transmissions perform this transformation.

A diagram comparing the power and torque bands of a "torquey" engine versus a "peaky" one

The dynamics of a car vary with speed: at low speeds, acceleration is limited by the inertia of vehicular gross mass; while at cruising or maximum speeds wind resistance is the dominant barrier.

The most common operating systems pre-installed on PDAs are:

Other, rarely used operating systems:

Some PDAs include Global Positioning System (GPS) receivers; this is particularly true of smartphones. Other PDAs are compatible with external GPS-receiver add-ons that use the PDA's processor and screen to display location information. Discount Authentic Online Alicia Mini Dress Black Halo Cheap Sale Factory Outlet Cheap Sale Pay With Visa Latest Discount RRjOQgvqR
PDAs with GPS functionality can be used for automotive navigation. PDAs are increasingly being fitted as standard on new cars. PDA-based GPS can also display traffic conditions, perform dynamic routing, and show known locations of roadside mobile radar guns. Karl Lagerfeld SemiSheer Long Sleeve Blouse w/ Tags Reliable Online Best Store To Get Online Clearance Clearance Store Z7vwk
, Garmin , and offer GPS navigation software for PDAs.

Some businesses and government organizations rely upon rugged PDAs, sometimes known as enterprise digital assistants (EDAs) or mobile computers , for mobile data applications. These PDAs have features that make them more robust and able to handle inclement weather, jolts and moisture. EDAs often have extra features for data capture, such as barcode readers , radio-frequency identification (RFID) readers, magnetic stripe card readers, or Best Place Sale Online New Arrival Fashion Aiden Embroidered HighRise Cotton Skirt Miguelina Sale Exclusive Visit New Sale Online kNmbY83P
readers. These features are designed to facilitate the use of these devices to scan in product or item codes.

Typical applications include:

Many companies have developed PDA products aimed at the medical professions, such as PDAs loaded with drug databases, treatment information, and medical information. Services such as AvantGo translate medical journals into PDA-readable formats. WardWatch organizes medical records, providing reminders of information such as the treatment regimens of patients to doctors making rounds. Pendragon and Syware provide tools for conducting research with, allowing the user to enter data into a centralized database using their PDA. Microsoft Visual Studio and Sun Java also provide programming tools for developing survey instruments on the handheld. These development tools allow for integration with databases that are stored on the handheld and can be synchronized with a desktop- or server-based database. PDAs have been used by doctors to aid diagnosis and drug selection and some studies [ ] have concluded that when patients can use PDAs to record their symptoms, they communicate more effectively with hospital staff during follow-up visits. The development of Sensor Web technology may lead to wearable bodily sensors to monitor ongoing conditions, like diabetes or epilepsy , which would alert patients and doctors when treatment is required using wireless communication and PDAs.



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