There was no swimming event in the ancient Olympic Games, but swimming has always been mastered by human beings. In the struggle against nature, in order to survive and sometimes for entertainment, human beings have gradually mastered swimming skills. Until 1896, swimming entered the first modern Olympic Games.… Read More
Skiing is an ancient sport. With the development of economy, this sport has been well promoted in Europe and America and has more people. The promotion of skiing as a competitive sport in China has had considerable twists and turns. In recent years, it has achieved vigorous development with the successful bid for the Beijing Winter Games.… Read More
With the development of economy, automobiles have become a common means of transportation for people.
The urban parking lot makes the cars in the city run normally and smoothly, and the parking lot is developing into an essential element of a city, its illuminance should also be paid attention to.… Read More
With the increasing number of tunnel projects, tunnel construction plays an increasingly important role in modern transportation. The tunnel is a closed space, and natural light cannot illuminate it. In order to ensure the continuity of driving and the safety of pedestrians, artificial lighting is required for the entire interior even during the day.… Read More
Solar energy refers to the thermal radiation energy of the sun, and its main manifestation is the sun’s rays. Solar energy is inexhaustible, and it is a renewable green energy source, so now energy-saving solar energy equipment is also adopted on the market, such as our common solar water heaters, solar street lights…
As the earth’s resources become increasingly scarce, the investment cost of basic energy is rising, and various safety and pollution hazards are everywhere.… Read More
In the professional production process of movies, although the principle of the picture is to be realistic and natural, in fact, almost no good works can be produced only by relying on natural light. Therefore, artificial lighting is used for supplementary lighting in film and television production.… Read More
In modern life, whether it is home or outdoor, stadium and other large places, flood lights have been widely used. flood lights can be seen in common scenes such as roads, streets, and parking lots.… Read More
Halbleiter-Leuchtdioden (LEDs) werden häufig in Anzeigeleuchten, Signalleuchten, Instrumentenanzeigen, Hintergrundbeleuchtungen von Mobiltelefonen, Kraftfahrzeuglichtquellen und anderen Gelegenheiten verwendet. Auch die Weißlicht-LED-Technologie hat sich weiterentwickelt und LEDs werden immer häufiger im Beleuchtungsbereich eingesetzt. In der Vergangenheit gab es keine umfassenden nationalen Standards und Industriestandards für LED-Tests. In der Produktionspraxis könnten nur relative Parameter zugrunde gelegt werden. Verschiedene Hersteller, Anwender und Forschungsinstitute hatten darüber viele Kontroversen, die zur Entwicklung der heimischen LED-Industrie führten.… Read More
In order to realize the dynamic lighting design of the LED, the light color quantity of the light source needs to be controlled in real time to modulate the spectrum that meets the requirements of photobiology.
The amount of light color here is the collective name of luminosity and chromaticity. Commonly used dimming methods for LEDs include analog dimming and PWM (Pulse Width Modulation) dimming.… Read More
ROI ist die Kapitalrendite, die sich auf den Wert bezieht, der durch Investitionen zurückgegeben werden sollte, dh die wirtschaftliche Rendite, die ein Unternehmen aus einer Investitionstätigkeit erzielt.
Berechnungsformel:
Kapitalrendite (ROI) = Jahresgewinn oder durchschnittlicher Jahresgewinn/Gesamtinvestition × 100 % Aus der Formel geht hervor, dass Unternehmen die Kapitalrendite steigern können, indem sie die Vertriebskosten senken, die Gewinnmargen erhöhen und die Effizienz der Anlagennutzung verbessern.… Read More