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If you reach an unsafe speed while descending a downgrade on a highway, apply the brakes to reduce your speed and downshift to a lower main gear.

Retarders are designed to provide auxiliary slowing of the vehicle, such as for controlling the speed on long downgrades without the use of the main braking system. Engine retarders (also known as engine brakes) help to save the main braking system for emergency stopping.

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In short, an aspheric lens is a lens that provides higher-quality imaging. They adjust curvature and shape to correct problems such as spherical aberration, ...

Drivers of trucks equipped with engine brake retarders must avoid unnecessary use of these systems in cities and residential areas. The use of retarders on vehicles which are inadequately muffled results in a harsh irritating noise. The engine brake retarder develops its retarding efficiency at higher engine rpm, therefore, gear selection is important.

"PG&E" refers to Pacific Gas and Electric Company, a subsidiary of PG&E Corporation. Copyright 2021, Pacific Gas and Electric Company. All rights reserved ...

Stopping on an icy road surface will require you to threshold brake to prevent the wheels from locking up. On vehicles equipped with anti-lock brakes, apply according to the vehicle manufacturer's instructions. A slow revolving wheel on an icy surface will be more effective than a locked wheel skidding on icy surfaces. To proceed down a steep grade, select a gear low enough to control the speed (usually one gear below the one you would use to climb the same hill) and use engine retarder brakes if so equipped. This should reduce the need to use your brakes to a point where they will overheat and your air supply will not be seriously depleted.

Sep 1, 2022 — ... gratings when = 0°,. Grating Equation 1. (1). known as the grating equation. The equation states that a diffraction grating with spacing a will ...

Brakes must be applied cautiously when the vehicle is negotiating a curve or travelling on wet or icy surfaces. Over-braking could result in jackknifing or skidding.

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In a combination of vehicles (such as a truck and trailer, or power unit with a semi-trailer unit) equipped with an air brake system, the trailer brakes are applied along with the tractor brakes by use of the foot control valve. This is often referred to as "balanced braking." The application pressure of the trailer brakes is equal to the application pressure of the tractor brakes. The trailer brakes may be applied independently of the tractor brakes by use of the hand control valve. If the driver wishes, the amount of application on the trailer brakes may be increased during a foot valve application by using a higher application with the hand valve. Trailers equipped with electric or vacuum brakes are operated in a similar manner.

If you are unable to stop to prevent a collision, the fact that you were travelling downhill is no excuse; your speed should have been adjusted to the condition.

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When the speed of the vehicle has been decreased sufficiently, ease off the amount of brake application and the actual stop will be gradual. The professional driver can perfect these stops by practising the amount of brake application release to prevent a jerk-back at the actual stop. This braking skill, coupled with factors of:

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Polarized Glass is a modern type of absorptive polarizer made of elongated silver or copper nanoparticles embedded in thin glass plates. These polarizers are more durable, and can polarize light much better than plastic Polaroid film, achieving polarization ratios as high as 100,000:1 and absorption of correctly-polarized light as low as 1.5%. Such glass polarizers perform best for short-wavelength infrared light, and are widely used in optical fiber communications.

Water entering brake drums will reduce the braking effort, so avoid running through large amounts of water whenever possible. Place a slight drag on the brakes when it becomes necessary to run through water, to reduce the amount of water admitted to the drums and shoes. During excessively wet conditions, or after passing through water, test the brakes. It may be necessary to drag the brakes slightly for a short distance to dry them out and restore normal braking. Always reduce your speed before driving through large pools of water on the road.

Aspheric lens surfaces are used to correct spherical aberration wheretheconverginglightfromalensdoesnothaveacommonfocalpoint,resultinginadistortedimage in ...

Bringing a vehicle to a complete stop on a level roadway usually requires only a single application of the brakes. The degree of application will be determined by the speed, weight and degree of emergency.

In normal stopping, the brake components heat up. Heat will continue to build up with excessive hard braking until it exceeds the capability of the brake components to absorb and dissipate the heat. As brake drums heat up, they expand away from the brake linings. Too much heat can result in brake fade, brake damage and/or brake failure. Brake components or tires may actually catch fire. The highest brake temperatures occur when braking from highway speeds while on long downgrades, or from repeated use of the brakes without enough cooling time between applications.

In contrast to spheric lenses, aspheric lenses lack a constant radius of curvature. They are designed to eliminate spherical aberration, improving image quality ...

Large vehicles such as truck-trailer and semi-trailer units have engine governors which control the maximum rpm at which the engine may be operated. When descending steep grades, special caution should be taken by maintaining correct speed in relation to gear selection to keep the engine rpm at least 200 to 300 below the maximum governed rpm. In other words, if the momentum of the unit is allowed to push the engine over its governed speed, engine damage could occur.

In Raman spectroscopy, the information of inelestically scattered monochromatic (laser) light is used to investigate the chemical nature of matter. This process ...

The gear selected to descend the grade is usually determined by the driver's decision of the gear ratio needed to climb the grade. Gear selection should be made before descending the grade, rather than on the downgrade, to minimize the chance of missing a shift. Be cautious if you’re using retarders/engine brakes on slippery road surfaces. Some can actually cause the drive wheels to lock up, stalling the engine, and can result in loss of control or even cause a tractor/trailer to jackknife. The driver of a truck equipped with a retarder system must be familiar with the manufacturer's recommended use of the retarder under all road and weather conditions.