Who and when made the first round-the-world voyage of submarines without surfacing to the surface? Detailed answer

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Who and when made the first round-the-world voyage of submarines without surfacing to the surface? Detailed answer

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Who and when made the first round-the-world voyage of submarines without surfacing to the surface?

In 1966, a detachment of Soviet nuclear submarines under the command of Rear Admiral A. Sorokin made the first round-the-world voyage without surfacing to the surface.

Author: Kondrashov A.P.

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Why is the sky blue during the day and red during sunset?

The short-wavelength components of the solar spectrum are scattered in the air more than the long-wavelength ones. This is why we see the sky as blue, because blue is at the short wavelength end of the visible spectrum. For a similar reason, during sunset or dawn, the sky on the horizon turns red. During this time, the light travels tangentially to the earth's surface and travels much longer through the atmosphere, causing much of the blues and greens to escape direct sunlight due to scattering.

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DALI (Digital Addressable Lighting Interface) is a digital protocol designed specifically to create low-cost and flexible building lighting control systems. Only two wires are required to form a connection between DALI devices, and there is no need to observe polarity.

Historically, this protocol has gained immense popularity for lighting control in conjunction with ballasts (drivers) of fluorescent lamps. However, there are not so many LED lamps or power supplies for LED lamps (drivers) with the DALI protocol on the market. Current products that support DALI digital control are more expensive than common devices with a dimming interface based on a modulated pulse width (PWM) signal or a 0-10 V signal.

The DAP-04 converter from Mean Well allows you to connect to the lighting control bus via the DALI interface and get 4 independent analog PWM signals at the output. Thanks to DAP-04, instead of ready-made luminaires or drivers with DALI control, you can use cheap luminaires or drivers with simple PWM or 0-10 V control. In this way, a simple controlled DALI-based lighting system is realized with little financial cost.

Additionally, without an external DALI controller, the device allows you to implement the control of luminaires according to the "Push Dimming" option (control of the luminaire by pressing the switch). Up to 20 drivers can be connected to each output of the device, and thus it is possible to organize 4 controllable groups of 20 lamps each, which is quite enough for a medium-sized room.

When installing the system, it is necessary to program and assign the DAP-04 (master controller) address. By default, the transmitter has address 255, which means "address not defined". After assigning an address, DAP-04 can work with any DALI controller.

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