GPS is a power consumer and often receives only weak signals in urban centers. Now, computer scientists have developed an inertial sensor for smartphones to fill this gap.
If you have ever used a smart phone to navigate, you will know that one of the biggest problems is power consumption. The GPS sensor is a significant battery drain, so any relative length journey requires some kind of external power source. In addition, even at towering office buildings in city centres, bridges and tunnels often encounter block signals that make it difficult to receive GPS signals. So definitely need to use a trick to reduce power consumption, while improving the positioning accuracy of the device. Today, Zheng Bo at the Illinois Institute of Technology in Chicago and several good friends said that they have developed such a program called SmartLoc and tested it widely and used in this windy city. They said that in the city, GPS has a positioning accuracy of about 40 meters. By comparison, their SmartLoc system accurately positions their position within 20 meters.
How do these guys achieve this improvement? The trick used by Bo and good friends is to use the inertial sensor of the smartphone to determine its location. The way this project works is simple. Imagine a smart phone fixed around the windshield driving a car around the town. Given that reading began with the GPS, the smartphone built-in or online map knows where it is. It then uses an inertial sensor to measure its acceleration, indicating forward movement or turning to the left or right. For its part, this kind of data is very useful because it is difficult to tell whether the vehicle's acceleration has accelerated or exceeded the kyphosis bridge. In order to solve this problem, smart phones check the layout and function of road sections on the map, which may affect sensors, curved roads, traffic lights, humpback bridges and the like. Each of these people has a specific inertial signature phone that can be found. In this way, it can match the road characteristics of the inertial signal at that point. The key here is that each road should have a unique signature. Baihe cooperation has discovered a wide range of inertial signatures, such as deceleration, waiting for a set of traffic lights associated with acceleration, and even changing the gravity when a bridge is crossed. After collecting this data, the SmartLoc program focuses on these signatures while the car is moving. These guys have been tested using the Galaxy S3 smartphone on the city streets and it works very well. They pointed out that in urban centers, GPS signals disappeared by distances of up to one kilometer, which would lead to a complete chaos in a traditional navigation system.
However, SmartLoc just fills this gap, using its inertial signature database and a map of the area. "Our extensive evaluation shows that SmartLoc improves positioning accuracy to less than 20m at 90% or more," they said. This of course looks very convenient. This performance can also help save battery power, allowing the smartphone to periodically turn off the GPS sensor and run using only inertial sensors. Bo explains their plans and their new system. One obvious idea will be to release it as an application, which is obviously uploaded to the Android platform. Another idea is to sell this technology to existing surveying and mapping companies. Maybe they are planning. Whichever goal it is, it seems worth paying attention.
A heat exchanger is a device used to transfer heat, usually to transfer heat from one fluid to another without them mixing. A heat exchanger usually consists of a number of parallel pipes in which one fluid flows through the pipe and another fluid flows through the outside of the pipe. In this way, heat can be transferred from one fluid to another for heating or cooling purposes. Heat exchangers are widely used in many industries, such as chemical, pharmaceutical, food processing, air conditioning and heating systems, etc.
Heat exchanger usually consists of the following components:
1. Heat exchange pipe: Pipe used to transfer heat, usually made of metal materials, such as copper, stainless steel, etc.
2. Heat exchange surface: A surface used to transfer heat, usually consisting of metal sheets or pipes. The greater the surface area, the higher the heat transfer efficiency.
3. Housing: Housing, usually made of metal or plastic, used to secure heat exchange pipes and surfaces.
4. Seals: Seals used to prevent media leakage, usually made of rubber or silicone rubber.
5. Support: A support used to support a heat exchanger, usually made of steel or cast iron.
6. Import and export pipes: pipes used for medium entry and exit, usually made of metal or plastic.
7. Cleaning hole: A hole used to clean the inside of the heat exchanger, usually located on the upper or side of the heat exchanger.
8. Insulation layer: Insulation layer used to keep the temperature of the heat exchanger stable, usually made of glass wool or polyurethane foam.
The main business scope is various heaters, waste heat boilers, pressure vessels, supportingair preheaters, air coolers, furnace accessories and accessories, and provide equipment installation, with EPC ability of projects. At present, our customers have covered all large and medium-sized petrochemical enterprises in China and established long-term strategic cooperative partnership with them. Products are exported to Southeast Asia, Middle East, and other regions.
Heat Exchanger,Tubular Heat Exchanger,Efficiency Tubular Heat Exchanger,Tube In Tube Heat Exchanger
Jiangsu Gelan Environmental Technology Co., LTD , https://www.glkj2010.com