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RFID technology has been widely adopted for supply chain management purposes. Its inherent identification capabilities provide the opportunity to trace products from the producer to the retailer, offering insight to the various levels of the supply chain. As a result the supply chain has become more responsive to continuously changing conditions, but yet more efficient to coordinate. This is justified due to the fact that inventory tracking information can be linked with other databases, such as Enterprise Resource Planning (ERP) databases, providing decision makers a global, real-time picture in order to optimally utilize available resources.
Finally, another case of successful adoption of the RFID technology is the point of sales. Examples in this category are toll stations, drive through stores, automatic fuel stations and more. These systems operate in the following simple way: the consumer holds an RFID tag, in the form of a smart card. This card is able to be charged in return for acquiring goods. As the consumer passes through the point of sales RFID readers charge him automatically.
There exist considerable challenges in designing and implementing RFID middleware. These challenges come from the underlying physical constraints, along with the vast generation of information that has to travel across heterogeneous networks.
 

In order to encourage more enterprises to participate in this emerging industry, from 2014, the Brazil government began to adopt a special solar power auction system to attract enterprises to participate. The auction system will enable enterprises to effectively evaluate solar energy projects, and make reasonable quotations, to a certain extent to ensure business income, stimulate investment enthusiasm.
 

At the end of March 2017, RFID World Congress is held in China, RFID technology in the past decade has become one of the mature core technology, the cost of more Is a direct number of companies willing to import RFID technology, to carry out asset identification, data collection, which business model diversity and business opportunities, but also in the future, RFID have more opportunity to be used in vertical areas.
RFID technology in the past decade has a very mature technology evolution, RFID tag (tag) is down to 5 to 10 cents level. With the label and the reader's cost gradually reduced, manufacturers willing to use RFID also increased significantly.
In addition, RFID technically compared with the traditional bar code also has technical advantages. In some fields such as warehousing, logistics, bar code applications have their limitations, short sensing distance and rely on manpower, when the equivalent is very easy to produce man-made mistakes, RFID can be in accordance with the different field, the use of different bands Characteristics to build RFID identification system, reduce human error and efficiency.
 

PV agriculture integrated grid-connected power generation projects, the combination of solar power generation, modern agricultural cultivation and breeding, and efficient facilities agriculture, on the one hand, solar photovoltaic systems can be used directly to low-cost agricultural power generation.
 

What is the hottest now, that unmanned retail stores must come to our mind. Since the end of last year, Amazon in the United States opened the first unmanned entity Amazon Go. And this year, series of Chinese retail giants like Alibaba, JingDong, Wa Haha, T-mall have set their own unmanned store to start the venture. Today let’s talk about the important part of unmanned stores, RFID technology.
Radio-frequency identification (RFID) is a technology to record the presence of an object using radio signals. It is used for inventory control or timing sporting events. RFID is not a replacement for the barcoding, but a complement for distant reading of codes. The technology is used for automatically identifying a person, a package or an item. To do this, it relies on RFID tags. These are small transponders (combined radio receiver and transmitter) that will transmit identity information over a short distance, when asked. The other piece to make use of RFID tags is an RFID tag reader.
Conceptually, RFID is similar to barcode technology. Barcode technology is to bar code information attached to the items, through the scanning gun on the bar code on the items to scan, to obtain the information of the items. The RFID technology will be attached to the RFID tag on the items, through the RF signal to the label of the information read to the RFID reader, so as to obtain the unique information of the items. Compared to the traditional bar code, RFID technology advantages are as follows:
1. Quick scan
The RFID reader can simultaneously read and read multiple RFID tags, compared to a barcode that can only be scanned for a barcode at a time.
2. Penetrating and barrier-free reading
In the case of coverage, RFID can penetrate non-metallic or non-transparent materials such as paper, wood and plastic, and be able to communicate with each other. And the bar code scanner must be in close proximity and no objects blocked in order to be able to identify the bar code.
3. Large memory capacity
Barcode capacity is 30 characters or so, 2D bar code maximum capacity can be stored 2 to 3000 characters, the largest number of RFID capacity is a few trillion characters, with the development of memory carriers, data capacity has been expanding the trend.
4. Small size and diverse shapes
RFID reading is not limited by size and shape, do not need to read the accuracy of the paper with the fixed size and printing quality, unlike the barcode prone to deformation and breakage and other problems caused by unrecognized. In addition, RFID tags can be more miniaturized and diverse forms of development to apply to different products.
In the short term, "Unmanned Store" is difficult to become the next burst of RFID technology, but it is the RFID technology in the field of consumer retail a new attempt. Of course, "unmanned retail stores" reason RFID technology attracted attention now, the value of this new retail form is also to the line of customer consumption of large data collection. Overall, the unmanned retail stores are still in the early days of technology exploration, so it is too early for the real unattended.

Generally speaking, the process of converting AC power into DC power is called rectification. The rectifier circuit is called rectifier circuit. The device of actual rectification process is called rectifier or rectifier, and the corresponding DC is converted into AC power The process known as the inverter, the circuit to complete the inverter function as the inverter circuit, the actual inverter process device called inverter equipment or inverter. PV inverter will be issued by the PV module DC into a sine wave current, access to the load or into the grid, the PV system is the core device.
 

RFID is to paste tags on goods, animals, or people for the purpose of identification and tracking by electromagnetic waves. In recent years, RFID technology has developed rapidly and appeared in many applications, such as logistics transportation, traffic toll collection, asset tracking, employee attendance record, and so on. With the advantages of rapid identification, long-range read-write, high memory capability and high reliability, the ultra-high frequency (UHF) passive RFID is now a preferred technology among all the RFID technologies. 



The reader antenna is one of the key components in RFID systems and has been designed with circularly polarized (CP) operation, because CP waves can avoid severe polarization mismatch and ensure the reliability of communications between readers and tags. Another issue researchers need to consider is that each country has a different frequency for UHF RFID applications and the universal UHF RFID frequency ranges from 840 to 955 MHz (bandwidth of 12.8%). Therefore, a reader antenna covering the entire UHF RFID frequency would contribute to the development of cost-effective RFID system for worldwide application. In addition, RFID handheld readers should have compact size and directional radiation pattern. 



To achieve CP radiation across the universal UHF RFID band, structure of stacked corner-truncated patches fed by suspended microstrip feed line through four probes was investigated in, and then the multi-feed structure was improved by using a horizontally meandered strip feed technique. To simplify the structure and design process of the universal UHF RFID reader antenna, the directly-fed single-layer patch with a coplanar parasitic patch and an L-shaped ground was presented in. For the purpose of miniaturization, crossed dipole, tortuous monopole, fractal monopole, and square slot structure are employed to CP RFID reader antennas. Slot-loaded circular and square patches fed by L-shaped probe and proximity-fed line are adopted for designing compact directional CP antenna. Nevertheless, the CP bandwidths of these antennas are still narrow. 



Actually, the multi-feed antenna based on a feed network and sequentially rotated elements can achieve larger bandwidth and higher CP performance compared with single-feed technique. A small reader antenna consists of four monopole fed by a series feed network is presented in. Methods of meandered line are applied to both radiating elements and feed network for miniaturization at the expense of small CP bandwidth. Recently, the two-feed antenna using shorted inverted-L radiating elements and shorted inverted-T strip is studied in. But the asymmetric radiating structure deteriorates the axial-ratio (AR) of the antenna. To the best knowledge of the authors, there were no report and literature about the compact CP directional universal UHF RFID antenna for handheld reader applications at present.

First, from the application of distributed photovoltaic scenarios to match the inverter, according to local conditions to choose the appropriate inverter to play the greatest role. Inverter models how to choose? Single or three phase? These are dependent on the roof of the situation, the family roof or courtyard, installed capacity is small, the general choice of single-phase or three-phase grid group of string inverter, roof area Is too large to choose three-phase inverter; industrial and commercial roofs, complex mountain and greenhouses project, for the irregular, prone to local occlusion, installed capacity, low pressure or medium voltage multiple grid voltage of the scene, the general Select the three-phase group of string inverter; for the Northwest region of large ground and desert power station, the proposed use of centralized box inverter.
 

The solar controller is an important part of the solar PV system that automatically prevents the battery pack from overcharging and overturning and has a simple measurement function of the electronic device. As the battery pack is overcharged or over discharged will seriously affect its performance and life, charge and discharge controller in the photovoltaic system is generally essential. It largely determines the reliability of solar photovoltaic systems. The main task of the controller is to realize the solar energy to charge the battery and protect the battery in the PV system.

There is an ever growing interest in RFID technology given its ability to associate with remote sensors. The market of the spirituous beverages, particularly the most expensive ones are a target for the application of RFID tech. The low cost associated to the RFID tags create an opportunity to embed intelligence into the bottles without increasing the cost burden to the producers.
The challenge to create an antenna for a RFID tag to be embedded into bottles has already been addressed by some researchers and different solutions have been proposed, while none has shown an effective test with a RFID reader. Some solutions presented place the antenna into the bottle neck, or even in the cap, this is reasonable for glass bottles, but for plastic bottles the integration has to be into the body of the bottle, which was proposed in.
 

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.