Pay attention to the suitability of choosing ppe

Work time, only every weekend to give yourself a touch of comfort. I believe many people will choose to sleep on the weekends naturally wake up, and then go out to go shopping with friends, watching movies, or to exercise it. So at rest, what should wear it? Accustomed to high heels, shawl hair, it is better to come and see the wave of sports and leisure style.

On leisure, who than had wild T-shirt it. Simple gray T-shirt, giving a quiet and elegant atmosphere. Coupled with the embroidery patterns on clothes, but also adds a bit of classical beauty and little fresh. At the same time yellow and red embroidery flowers more to the overall increase in vitality and vitality. Lower body with black white sweatpants, but set the style of leisure and fashion as one oh.

Big red gives a shine, and warm feeling. The design of the small V-neck adds a little bit more just the right little ***y, white and red combined with a slight increase in tenderness. Lower body does not match the wild black, but chose the opposite of the dark blue. Mixed with not only did not bring any discomfort, but increased a bit of personality and fashion. Want more styles of small Lord, you can go to pop-style shopping Oh.

Light Emitting Diode Lamp Beads

Like ordinary diodes, light-emitting diodes are composed of a PN junction, and they also have unidirectional conductivity. When a forward voltage is applied to the light-emitting diode, the holes injected from the P area to the N area and the electrons injected from the N area to the P area are respectively in contact with the electrons in the N area and the voids in the P area within a few microns of the PN junction. The holes recombine and produce spontaneous emission fluorescence. The energy states of electrons and holes in different semiconductor materials are different. When electrons and holes recombine, the energy released is somewhat different. The more energy released, the shorter the wavelength of the emitted light. Commonly used are diodes that emit red, green or yellow light. The reverse breakdown voltage of the light-emitting diode is greater than 5 volts. Its forward volt-ampere characteristic curve is very steep, and it must be used in series with a current-limiting resistor to control the current through the diode.

The core part of the light-emitting diode is a wafer composed of a P-type semiconductor and an N-type semiconductor. There is a transition layer between the P-type semiconductor and the N-type semiconductor, which is called a PN junction. In the PN junction of certain semiconductor materials, when the injected minority carriers and the majority carriers recombine, the excess energy is released in the form of light, thereby directly converting electrical energy into light energy. With reverse voltage applied to the PN junction, it is difficult to inject minority carriers, so it does not emit light. When it is in a positive working state (that is, a positive voltage is applied to both ends), when the current flows from the LED anode to the cathode, the semiconductor crystal emits light of different colors from ultraviolet to infrared, and the intensity of the light is related to the current.

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