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In recent years, with rapid development of wireless sensor networks and smart objects such as smart phones, tablets and other devices are extensively used to build heterogeneous network, Breakthroughs have been made in Internet of Things (IoT) with variety of applications such as environmental monitoring, medical treatment and public health care, Intelligent Transportation System (ITS), Smart perimeter control, smart grid and other areas.
 
The passive RFID tags attached to the items offer multiple benefits over the bar code for both the retailers and consumers. The retailers will have unique and unified item identification from the manufacturing plant to consumer. They may also help the consumers to shop the items in a smart shop which has cart enabled with RFID readers which tabulates the items and allows the consumer to check out the products by paying online at the cash counter, which avoids long check outs. RFID technologies in shops and retails help to configure shelves to intelligently issue a refill order automatically to back end storage as items are sold, which offers precise delivery of items from the wholesaler directly to the shelf. Smart phone apps provide facilities for consumer to transmit the list of items to be purchased to the shop, when the customer reaches the shop he may find readymade shopping bag packed with items he needed from the shop or retailer. With this ability customer can directly make payment online and inventory of belongings may be stored in the mobile phone making insurance claims easier and facilitating the private sales of goods since a centralized registry of things will no longer be needed.

Energy is the most important factor restricting economic development, and the recent global energy crisis has forced the world countries are actively developing new energy sources. In this large background situation, a variety of new energy sources such as solar energy, wind energy and bio-energy and other rapid development. Which solar energy with its unique advantage are the world's research hot spots.
 

According to professional report by China General Chamber of Commerce, there was 181 billion RMB lost of retail industry in 2016, from stolen. And the loss rate increased year by year on these 5 years. The traditional way to prevent damage has been unable to save the problem of retail damage, technical upgrading is emergent without delay.
With the progress of retail technology, many big retailers have used some modern anti-damage measures, like Electronic Article Surveillance (EAS), CCTV, and installation of cash registers and closed-circuit television monitoring system combined cash register monitoring system (POS/EM). The EAS system is set at the key position of mall, could directly detected in the goods on the effective anti-theft labels, so that sound and light alarm.
RFID technology has brought new changes to retail damage.Using RFID technology, for the goods attached with RFID tags will be able to clearly understand the way of goods theft, type, quantity, loss of time and other information. After the adoption of RFID technology on the goods, managers can quickly cycle inventory, real-time tracking of goods. Staff only in the Treasury and sales areas were circulating inventory, monitoring real-time inventory, the difference can be found in the operation of goods in the process of change, and clearly understand the loss of goods.
To achieve commodity traceability, reduce natural wear and tear. Low temperature fresh food is easy to degenerate, the use of active temperature shelf labels can perceive the temperature, real-time accurate price at the same time. With the handheld RFID reader, when the temperature is high or low, the system that Will be prompted by the background management system, SMS prompts or tag signal prompts the staff to promptly adjust the temperature, to avoid the refrigerator due to deterioration of food caused by the loss of treatment.
 

Inverter is divided into centralized inverter, group of string inverter and distributed inverter.
 

 
It is well known that UHF RFID, one of the key technologies of Internet of Things, is becoming the mainstream research of RFID applications. In a RFID system, reader plays an important role, however, RFID reader with only one channel often cannot satisfy the application requirements due to the complicated working environment.



Since the working environment of the RFID reader is becoming more and more complicated, multi-tag identification reliability of single channel RFID reader often cannot meet the requirements, in addition, it is also very inconvenient for single-channel RFID readers to compose large-scale application systems. Therefore, increasing the number of the antenna to design multi-channel RFID reader is very necessary. 

 

10 years ago, the United States Jay AF Mercer M received a master's degree in solar energy engineering at the Arizona State University, but he was not many jobs in the United states. So he went to china. "The solar industry was pretty small," he recalls, "but the Chinese government has the ambition to develop the solar energy industry, and Massel sees his opportunities.". After years of knowledge of China's solar energy industry, he is now co founder of a solar energy technology company, with small solar projects all over the world. Misir is not the only American entrepreneur to Chinese. Alex, a company founded by Shure, installed photovoltaic panels on the roofs of Chinese buildings. His company, which deals with foreign companies in China that want to make the office greener, has installed 3 megawatts of electricity and installed 28 megawatts of photovoltaic equipment.
 

NEAR-FIELD radio frequency identification (NF-RFID) systems are being widely used for item-level tagging in pharmaceutical and retailing industries [1]. Since in NF applications the tag detection has to be limited within an assigned confined volume close to the antenna surface, a proper reader antenna design is required. A number of solutions for NF UHF RFID reader antennas have been proposed.
Antennas for NF UHF RFID readers have to exhibit a field distribution as uniform as possible on the entire interrogation area (i.e., the reader antenna surface) to avoid missed readings (false negatives). The field distribution uniformity level can be evaluated by considering the probability density function (PDF) of the NPD. Specifically, by calculating the NPD at a set of test points on a geometrical surface at an assigned distance from the antenna surface, a PDF curve can be generated.
The power density (Euclidean norm of the real component of the Poynting vector) has been proposed as a metric to numerically assess the performance of NF UHF RFID antennas. A proper normalization factor has been included to allow for the performance comparison among reader antennas with different size. The spatial decay rate of the normalized power density gives information on the expected behavior of the reading performance versus the distance from the antenna surface. Moreover, its probability density function is suitable to qualitatively estimate the probability of missed readings related to low-field regions on the reader antenna surface. Numerical results have been shown for three antennas presented in the open literature for near-field UHF-RFID applications, as well as for a standard

Radio-Frequency Identification (RFID) is the use of radio waves and electromagnetic fields to automatically read information stored on tags which are attached to objects for identification. A RFID system can be made up of three components: readers, tags and application software. A RFID reader is a device used to gather information from RFID tags, while RFID tags are the core of a RFID system, because they store the unique keys information of the traced objects that they are attached to.
 
Unlike barcodes, RFID tags can be embedded in the tracked objects and do not need to be within the line of sight of the reader. So it can be used to replace barcodes on library materials to store identifying information. Since RFID tags can be read even though they are covered by objects, a stack of books can be read simultaneously with high efficiency, reducing staff time to a large extent. With the Internet of Things (IOT) applying to library, RFID tags is gaining importance in library materials management. It is estimated that over 30 million library items worldwide now contain RFID tags.

The MPPT controller for the solar charge discharge controller, is used in solar power generation system, the control of multiple solar array on the automatic control equipment of battery and battery for solar inverter load power supply. It is a traditional solar charging and discharging controller. Today we compare the difference between the MPPT solar controller and the traditional solar controller to find out why it can replace the traditional solar controller.
  

A disruptive solution for sensing the activity of electrical devices connected to the home power line, based on the use of a long range UHF RFID system, is proposed. The solution uses a flexible RFID tag sensor wrapped around the power cord of the electrical device to be sensed. In addition to the identification of the device, the RFID tag has the unique property of detecting the status change, that is, the ON/OFF state of the device. A preliminary prototype using an external sensing acquisition block realized on a PCB connected to a flexible substrate holding the RFID antenna, have been realized and successfully tested. A sensing range of approximately 5-6 m using a regular RF reader operating in the UHF band, have been obtained, despite the close proximity of the power cord.