Properties of the Heat Kernel

The convolution integral will contain the product of two exponentials, so their arguments are added:$$exp(-frac|x-y|^24t-frac|y|^24s)$$Put the two fractions on a common denominator and re-arrange the terms of the numerator so that they form a complete square in $y$ again (plus a constant term)

1. 3 Tips for Protecting Digital Signage from the Summer Heat

Many cities around the world, especially Paris and other European cities, are seeing heat waves like they've never known this summer. Record-breaking temperatures swept across the continent, impacting Europeans, many of whom do not have air conditioning in their homes. These extreme temperatures can also harm digital displays, which are typically designed to operate between 32 and 90 degrees Fahrenheit. However, as the temperature increases for long periods, like the intense European heat, which reached 108.7 degrees Fahrenheit in Paris, digital signage may experience issues or even stop functioning. Because heat damage has been so prevalent this year, it's essential to take a moment and think about how to protect your displays. Even if you have not been affected by the recent heat waves, consider your area's climate and whether or not your devices are protected. If you are worried about heat damage or live in an area where extreme temperatures are prevalent, consider exploring a custom solution. Manufacturers can often create screen enclosures complete with fans or an internal heating unit. Each of these elements helps air circulate within the displays, thus stabilizing the internal temperature. Some custom work can protect devices from temperatures ranging anywhere from -22 degrees to 131 degrees Fahrenheit. Thermal management technology is an ideal safeguard for when temperatures fall outside of the optimal operating zone. Whether outside or indoors, protecting your displays from direct sunlight is crucial. Direct sunlight will not only increase a device's overall temperature, but it can also create specific hotspots. Hotspots refer to areas of high heat that can lead to permanent scarring of the LCD, LED or plasma screen. In LCD screens specifically, direct sunlight can cause the Liquid Crystal cells inside the display to boil, leaving behind a black spot. This phenomenon is known as solar clearing. If the LCD screen overheats, it can also lead to isotropic failure, and you may need to replace the device. Position digital signage out of direct sunlight, whenever possible. Whether inside a custom screen enclosure or under a tent or awning, this tactic will extend the life of your device. At least very least, provide proper airflow to keep the displays cool and functioning properly. Sunlight also creates a problem from a user experience perspective. Direct sunlight can obstruct the display, making it hard to view what is on the screen-whether it's a food and drink menu or advertisement. By installing anti-glare glass, you will improve your customers' experiences and ensure they see what you want to show them. Anti-glare glass protects your screens, as well. They deflect the light, improving readability as well as keeping your digital displays cool. Do your research first, though, as some anti-glare displays will reduce visibility for people wearing polarized lenses. Temperature regulation should be a key player from the beginning of your digital signage deployment. Installation should begin with a site assessment to determine where to place your displays to avoid hotspots and solar clearing as well as optimize the user experience. Installers should also understand how sunlight and heat affect digital displays, not to mention how the devices themselves can generate heat after being powered on for long periods. Kinettix has a global partnership of field techs who understand the inner workings of these displays and are ready to help you with your digital signage deployment. Our skilled partners know the importance of digital signage thermal management and know when to recommend increased protections. We are ready to help you roll out your digital signage, so you can more effectively communicate with consumers and enhance your brand's message.

2. heat exhaustion or is it the flu?

for the retard that says that you should not eat bacon or pork your just to dumb for your own good. swine flu is proven 100% not to be transmitted thru food okay? now this sounds like heat exhaustion if it continues for another few days GO to the doctor heat exhaustion only lasts one or two days

3. Heat Exchangers: How They Work, and Why They Are Needed

Exchangers are easily one of the most important and widely used pieces of process equipment found in industrial sites. Regardless of the particular industry in question, it will likely require some type of temperature regulation, and for that exchangers are likely to come into play. Exchangers may be used for either heating or cooling, however, in the industrial sector, particularly within plants and refineries, they are overwhelmingly used for cooling. Let's dive a little deeper into what they are, why they are needed, how they work, and how they are classified. As their name implies industrial heat exchangers are pieces of industrial equipment which are designed to exchange or transfer heat from one medium to another. The heat exchange may be for the primary purpose of heating up elements or cooling it down. Within the industrial sector, cooling tends to be the more prevalent function in order to prevent equipment or volatile substances from overheating. There are many different types of heat exchangers, each with their own advantages and drawbacks, yet tailored to best suit different purposes and industries. Heat exchangers have a very broad range of industrial applications. They are used as components of air conditioning and cooling systems or of heating systems. Many industrial processes call for a certain degree of heat to function; however, typically great care must be taken to keep these processes from getting too hot. Within industrial plants and factories heat exchangers are required to keep machinery, chemicals, water, gas, and other substances within a safe operating temperature. Heat exchangers may also be used to capture and transfer steam or heat exhaust that is released as a byproduct of a process or operation so that the steam or heat can be put to better use elsewhere, thereby increasing efficiency and saving the plant money. Different types of heat exchangers work in different ways, use different flow arrangements, equipment, and design features. One thing that all heat exchangers have in common is that they all function to directly or indirectly expose a warmer medium to a cooler medium, hence, exchanging heat. This is usually accomplished by using a set of tubes housed within some type of casing. Heat exchanger fans, condensers, belts, coolants, additional tubes and lines, along with other components and equipment work to increase heating and cooling efficiency or improve flow. This is commonly done to prevent contamination or pollution of one fluid by the other. The Physical State of the Fluids Heat Exchangers may also be classified based on the physical state of the hot and cold fluids. For example oil and water are immiscible. The arrangement of the hot and cold fluid's flow within the heat exchanger is another major way of categorizing them. The three major categories based on flow arrangement are: parallel-flow, countercurrent-flow, and cross-flow. Parallel-Flow - In parallel-flow heat exchangers the hot and cold fluids enter the heat exchanger from the same end and flow parallel to each other. Countercurrent-Flow - In countercurrent-flow heat exchangers the hot and cold fluids enter the heat exchanger from opposite sides and flow toward each other. Cross-Flow - In cross-flow heat exchangers the hot and cold fluids enter the heat exchanger at different points and as they travel through the heat exchanger they cross paths with each other, often at right angles. It is important to keep in mind heat exchanger maintenance and servicing. Maintenance and servicing will vary based on the particular type of heat exchangers in question and their design and construction. Keeping heat exchangers well-maintained is critical for optimal performance.