Test Standard for LED Light Converter From China to South Korea Finalized

South Korea announced last month that it would revise the safety standards and application essentials of electronic products, including the requirements for LED lighting appliances. This change will affect the export of Chinese led enterprises mainly in Dongguan and Zhongshan.

Recently, 10 experts inside and outside the province and relevant principals of 10 led leading enterprises gathered in the Municipal Science and Technology Museum to participate in the "notification and evaluation meeting No. g / TBT / N / Kor / 234 and 235". The evaluation meeting was hosted by China's WTO / TBT national notification information center, and undertaken by the WTO / TBT notification consulting and research center of the Provincial Bureau of quality supervision and the Municipal Institute of quality and technical supervision standards and codes.

On October 1, South Korea issued circulars g / TBT / N / Kor / 234 and 235 on electronic safety standards. These two circulars intend to revise relevant domestic standards along with the changes of the requirements of the International Electrotechnical Commission (IEC) on electromagnetic compatibility of lighting electrical, and list LED lighting appliances separately to clarify their specific requirements. According to experts, the previous relevant standards did not list LEDs separately for strict regulations.

Guangdong Province is the main province of LED products in China, of which Dongguan and Zhongshan have considerable LED industry clusters. According to incomplete statistics, the annual export volume of Dongguan enterprises has reached 1 billion yuan, accounting for about 20% of the national total. Qinshang optoelectronics, 100% technology and other leading led enterprises have successively set up sales offices in South Korea.

In accordance with the principle of transparency in the agreement on technical barriers to trade (TBT Agreement) under the framework of WTO, members can put forward opinions on the proposed technical measures through the notification advisory body, and the time limit is 60 days.

Therefore, experts and representatives of enterprises put forward opinions and suggestions on the technical standards to be revised in South Korea through the review meeting. Many members believe that although the standard sets technical requirements for the converter for new LED lamps, there is no corresponding detection method, which may be a big loophole. The organizer said that it would summarize these opinions and submit them to South Korea to maximize the convenience of LED export enterprises.

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Cavallo Point
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Simple&efficient Slider Module for the Following Purpose
Views Slideshow is not a bad way to go. It will probably take some working with css/templates/views to get it to display the way you want, but it is the most used module, so if you find yourself up against a wall using it, there's a good chance someone's already has done it and has written a tutorial, or would answer a question. There are a few other modules out there you could look at. A quick search I found this page, which has a decent listAlso a very in-depth comparison on the different modules out there from drupal. org.1. Is there a common home vegtable that i can feed my red eared slider babies? and how should i prepare it?When I first got my turtles I tried lots of different fruit and veg, They just left the ones they did not like. Some of their faves are Pear just chop up a litle bit, carrot...they skin peelings, they do not seem to like strawberries, bananas or grapes. Their favorite is mango. They have never liked letuce tho!.2. Content Sliders (Nivo Slider) and SEOThe most important thing is what google sees. You do not care what JavaScript does to the images. You care what Google reads.Either use Fetch as Google or Lynx Web Browser to see how your website looks like from search engine perspective. So first thing first - you should use alt tags on your images. This way it's more google-friendly, and actually becomes valid W3C code.Secondly - as far as I can see on Nivo Slider website it's using quite clean HTML inputso you should not be bothered at all with the fact that is slices images. It could slice them, rotate, turn into a thousand pieces - it would not matter at all. Google cannot see that. What should interest you is the HTML code. So your best bet in putting the description would be by using the longdesc attribute on img tag. Alternative is that you use divs that are forced to be hidden. Like that:But I am not sure if they wo not collide with slider script, and doing things like that in general is a bad practice.Third way would be to use progressive enhancement, and either - put your text descriptions in a placeholder Div, or do not put it at all onto a website. In first case you would want to replace your placeholder div holding your content with actual slider AFTER the main content is loaded (either use simple JS content or AJAX). In second case you would add a slider into the proper spot after the main content is loaded (again: AJAX/JS) and in terms of SEO: Work as if slider would not be there. Prioritize content instead (which is IMHO the best thing you can do).3. do red eared slider turtles shells stay smooth?First of all, your question is extremely worrying. You bought a red eared slider because it was cute? Turtles need extreme care. I am not entirely sure about the adult turtles' shells staying smooth but I can tell you one thing for sure, your turtle's shell will go soft if you do not take care of it properly. Soft-shell is an illness that turtles can acquire from not being looked after properly. You were right about them basking to harden their shell. They do this for just the reason of preventing themselves from getting Soft-shell. For this you need a UVA and UVB lamp so that they can get the sun's nutrients. You need to get your turtle a big enough tank as well with a good filter. I suggest a Fluval filter and probably a 20 gallon tank to start. Try getting it used because it's cheaper. Make sure you are feeding your turtle properly (mostly proteins when it's young and progressively more vegetables as it ages). I hope that I am giving you information that you already know.4. Where should my baby red eared slider sleep at night?Turtles usually prefer to sleep in the water at night, where they feel less vulnerable. They like to rest just below the surface of the water, where they can lift their heads out to breathe. If you are concerned about the water depth, you can make a small platform just beneath the water or add some plants (real or plastic) or other decor that juts out of the water slightly so your turtle can rest on them while still being able to lift his head up to breathe. If you have a submersible water heater, you probably would not need the heat lamp at night. I have a Turtle Topper (above tank basking area) for my painted turtle. It has a platform hanging from the bottom that sits just below the water surface. He likes to sleep there and climbs up onto it when I turn his light off for the night. My big RES, though, basks in the evening and often stays on her basking dock to sleep if she's up there when the light goes out.
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Vertical water tanks are better for groundwater storage purposes, while horizontal tanks are ideal for underground storage purposes. For household purposes, a vertical tank would be ideal, as rectangular and square tanks can fit in the corners and make best use of space. For large areas, cylindrical tanks are the best.Storage tanks are available in various colours such as black, white, green beige, etc. Black and green tanks are preferred, as they prevent ultraviolet rays and the growth of harmful bacteria.Always choose the high-quality low linear density polyethylene (LLDPE) material and food-grade plastic material. These are safe to use and are durable.Plastic water storage tanks are available with many layers. These multiple layers protect the tanks from the ultraviolet rays of the sun. The extra layers include the black middle layer and food-grade layers that make it safe for drinking water usage. So, opt for triple-layer tanks.Always select a well-known brand and one that has a warranty.See also: A quick guide on using water metersTips for maintenance and cleaning of plastic water tank• Ensure that the storage water tank is properly closed, to avoid any impurities or waste from entering. Regularly check for leakage of pipes and get them repaired immediately.• The purity of the water is also impacted by where it is stored. Whether it is a home building or a housing complex, the water tank should be cleaned and disinfected at least twice a year to avoid water contamination and to maintain health and hygiene.• To clean the tank fully, drain the stored water. Try to use it for some chores, rather than just wasting it.• Scrub the tank, to remove dirt and sediments. One can either use chlorine or liquid detergents to get rid of deposits and germs. 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Also, live rock and sand might not work because of the cold water( on second though, live sand should. Hope this helps!!
Which Characteristic of the Light Wave Does Jessica Change by Increasing the Intensity of the Light?
Which characteristic of the light wave does Jessica change by increasing the intensity of the light?(I think you've got the story muddled.) If there is a current, it will be proportional to intensity. If you increase the intensity at any fixed frequency, you increase the number of photons but te energy of each photon remains the same.— — — — — —A light wave has a frequency. But a photon, travelling at the speed of light, does not experience the passage of time. How can it exhibit a frequency then?Time only appears non-existent to the photon. To massive particles in the universe frequency is a property of the photon which dictates how, or not, it interacts with those particles. To use Mr Reiter's example of a rock, a rock has a mass but has no awareness of that mass. You on the other hand interact with the rock and can determine its mass etc. Not a brilliant analogy I know.— — — — — —INVISIBILITY- A POSSIBILITY?Have you ever read books like "Harry Potter" and "The Invisible Man" and found yourself wishing that you could turn yourself invisible? For many years, scientists have been working to turn that dream into a reality, and it looks like they've finally come one step closer to achieving it.Before we get into the science of invisibility, let us begin by understanding how our vision works. Normally, we see objects because light hits an object, bounces back, hits our eyes and sends the image to the brain which then makes sense of the image and voila. you have a cup in front of you. The colour of the said cup depends on the colour of light that it reflects back — if it's a green cup, it will absorb all wavelengths of light except green, which it will reflect and you end up seeing a green cup. Ok, as that's out of the way, let's get to the real deal.Scientists have experimented with many methods over the years to achieve invisibility. One such method that was devised made use of a new man-made material called metamaterial. Metamaterials are made of repeating patterns of composite materials like metals and plastics at a scale smaller than the wavelength of the phenomena that they influence. The reason they are so special is that their geometry, orientation and arrangement gives them new properties that cannot be achieved in natural materials. One of the properties is manipulation of electromagnetic waves — whether it be blocking, absorbing, enhancing, or bending these waves. In this list of properties, the one which is most useful to achieve invisibility and the very reason for which these materials are used, is the ability to bend electromagnetic waves like light. So, now the question is, "Why is bending of light so important to this discussion?" Well, the answer to that can be explained by going back to the basics.In order to see an object, light has to interact with it. Therefore, we can make the simple inference that in order to make an object invisible, light should not be allowed to interact with the object, but instead be made to bend around the object so that what you see is not the object, but what is behind the object, thus making it seem invisible. This is where the concept of negative refractive index comes into place.We have all seen and heard of "refraction". It is essentially the bending of light when it travels between media of different densities. Normally, the refractive index of air is 1 and in other materials it is greater than 1. This means that when light travels from air to another material, it usually bends towards the normal drawn to the surface of the material. Now, what if there was a way to manipulate the refractive index so that it becomes negative? This can be achieved by altering the internal structure of a material on a small scale, like in negative index metamaterials or left handed metamaterials to the point where we can switch the positive refractive index to negative, thus enabling us to manipulate the direction of bending of light.In 2007, a research team at Maryland's A. James Clark School of Engineering used plasmon technology to create the world's first invisibility cloak for visible light. The invisibility cloak device was a two-dimensional pattern of concentric rings created in a thin, transparent acrylic plastic layer on a gold film and only 10 micrometers in diameter. But the cloak used a limited range of the visible spectrum, in two dimensions. It would be much harder to achieve invisibility in three dimensions since scientists would need to control light waves both magnetically and electronically to maneuver them around the hidden object. More recently, in the University of Texas, scientists have been successful in concealing an object to microwaves. It was called metascreen and was made of a 66 micrometre thick polycarbonate film that supported an arrangement of 20 micrometer thick copper strips which looked similar to a fishing net. In the experiment that was carried out , when the metascreen was hit by 3.6 GHz microwaves, it re-radiated microwaves of the same frequency that were out of phase, cancelling out reflections from the object being hidden. This could have a lot of applications in radio communications, weather tracking and in health care. The material, called Quantum Stealth, is currently still in the prototyping stage, but was developed by the company's CEO Guy Cramer primarily for military purposes, to conceal agents and equipment such as tanks and jets in the field. Unlike traditional camouflage materials, which are limited to specific conditions such as forests or deserts, according to Cramer this "invisibility cloak" works in any environment or season, at any time of the day.Check out this video on Quantum Stealth:Other than these technologies, methods like spectral cloaking and active camouflage have also been developed. In spectral cloaking, light is not made to bend around the object, instead it shifts one spectrum of light to another and then shifts it back once it reaches the other side. If for example, we take the cup we mentioned before and shift the green light to another part of the spectrum that is not reflected by the object, say blue, then no light will be reflected and the object will not be visible. The device then shifts the green light back to reverse the process once the light reaches the other side. This method eliminates any kind of distortion that could be caused by bending of light around the object and hence is more effective. The cloaking device is constructed from two pairs of two commercially available electro-optical components. The first component is a dispersive optical fiber, which forces the different colors of a broadband wave to travel at different speeds. The second is a temporal phase modulator, which modifies the optical frequency of light depending on when the wave passes through the device. One pair of these components was placed in front of the optical filter while the other pair was placed behind it. This method of spectral cloaking could be applicable to securing data transmitted over fiber optic lines and also could help improve technologies for sensing, telecommunications, and information processing .It could also be used for selectively removing and subsequently reinstating colors in the broadband waves that are used as telecommunication data signals which could allow more data to be transmitted over a given link, helping to resolve impairments due to increased demand in data. In 2003, scientists at the University of Tokyo created a prototype active camouflage system that makes use of a material impregnated with retroreflective glass beads. The viewer stands in front of the cloth viewing the cloth through a transparent glass plate. A video camera behind the cloth captures the background behind the cloth. A video projector projects this image on to the glass plate which is angled so that it acts as a partial mirror reflecting a small portion of the projected light onto the cloth. The retroreflectors in the cloth reflect the image back towards the glass plate which being only weakly reflecting allows most of the retroreflected light to pass through to be seen by the viewer. This system works only when viewed from a certain angle. In conclusion, even though an invisibility cloak that could make objects, much less humans invisible has not yet been perfected, we are on the right track. The very fact that we have come this far goes to show that with technology and a creative mindset, anything is possible.Follow us for more of amazing and latest science and technology articles. We are also there on social media. Follow us on Instagram to stay updated.HAVE A GOOD DAY.
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