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Sliding Awning Roof
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awning measuremet Figure 1 shows an example trajectory of a system under sliding mode control. The sliding surface is described by {\displaystyle s=0}s=0, and the sliding mode along the surface commences after the finite time when system trajectories have reached the surface. In the theoretical description of sliding modes, the system stays confined to the sliding surface and need only be viewed as sliding along the surface. However, real implementations of sliding mode control approximate this theoretical behavior with a high-frequency and generally non-deterministic switching control signal that causes the system to “chatter” in a tight neighborhood of the sliding surface. Chattering can be reduced through the use of deadbands or boundary layers around the sliding surface, or other compensatory methods. Although the system is nonlinear in general, the idealized (i.e., non-chattering) behavior of the system in Figure 1 when confined to the {\displaystyle s=0}s=0 surface is an LTI system with an exponentially stable origin.

Commonly used to shade a window, with a roller tube at the top, spring-loaded side arms, and a motor, crank or tape-pull operator. Awnings with sides are commonly known as traditional style awnings as they have been used for many years dating back to the early 19th century using cotton canvas fabric. Canvas was replaced in the 1960s by more acrylic materials and polyester in more recent times driven by a focus on the environment. Traditional style awnings are appropriate for historical buildings and are still popular today using a more weather resistant fabric and a rope and pulley system for retracting the awnings.[3] Awnings without sides do not provide as much sun protection as those with sides. Awnings without sides come in many different styles. Drop Arm Awnings without sides come with roller tubes at the top and are available with motors and wind sensors for automatic retraction. Spear Awnings are made without sides and are made with Wrought Iron Frames and they can be retracted with a rope and pulley system but are not available with motors.

Awnings with sides provide the best sun protection for east and west facing windows. North and South facing windows can be protected from the sun with awnings without sides. Awnings provide shade keeping your house cooler, awnings are also great shade creators around porches, decks and patio

Shade sails provide semi-horizontal shading. They can be demounted with some difficulty and are usually left in place year round. Retractable versions also exist, with greater cost but also greater utility, as they can be retracted to admit winter sun if required.Shade sails provide semi-horizontal shading. They can be demounted with some difficulty and are usually left in place year round. Retractable versions also exist, with greater cost but also greater utility, as they can be retracted to admit winter sun if required.Shade sails provide semi-horizontal shading. They can be demounted with some difficulty and are usually left in place year round. Retractable versions also exist, with greater cost but also greater utility, as they can be retracted to admit winter sun if required.Shade sails provide semi-horizontal shading. They can be demounted with some difficulty and are usually left in place year round. Retractable versions also exist, with greater cost but also greater utility, as they can be retracted to admit winter sun if required.Shade sails provide semi-horizontal shading. They can be demounted with some difficulty and are usually left in place year round. Retractable versions also exist, with greater cost but also greater utility, as they can be retracted to admit winter sun if required.Shade sails provide semi-horizontal shading. They can be demounted with some difficulty and are usually left in place year round. Retractable versions also exist, with greater cost but also greater utility, as they can be retracted to admit winter sun if required.

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