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1. Fixed-point image monitoring and transmission system The wireless image monitoring and transmission system at a fixed point is mainly used in places where wired closed-circuit monitoring is inconvenient, such as monitoring systems for harbor terminals, video and data monitoring for river water conservancy, forest fire monitoring systems, and cities. Safety monitoring, construction sites, etc. The following describes the different image transmission technologies from low to high frequency bands.

1.1--2.4GHz ISM band of a variety of image transmission technology 2.4GHz image transmission equipment using spread spectrum technology, there are two kinds of frequency hopping and direct-scaling work. The frequency hopping mode is low, the throughput rate is about 2 Mbit/s, and the anti-jamming capability is strong. Different frequency hopping sequences can also be used to realize the same-site multiplexing to increase the capacity. The direct-spread mode has a high throughput rate, but its anti-interference performance is poor, and multiple sets of systems are restricted from the same site.

2.4GHz image transmission can be based on the IEEE802.11b protocol, the transmission rate is 11Mbit/s, and the overhead in the transmission process is removed. The actual effective rate is about 5.5-6Mbit/s. Later developed IEEE802.11g standard, the rate limit reached 54Mbit/s, up to 108Mbps in special mode, the standard has high interoperability, point-to-point transmission of several MPEG-4 compressed images.

Also used in the 2.4GHz band are Bluetooth technology, HomeRF technology, MESH, and microcellular technology. With the gradual expansion of the application range, the 2.4 GHz frequency band is operating at full load. The rate issues, safety issues, and interference issues deserve further study.

1.2-3.5GHz Wireless Access System The 3.5GHz wireless access system is a point-to-multipoint microwave communication technology using FDD duplex mode, using 16QAM and 64QAM modulation methods and based on the DOCSOS protocol. Its operating frequency band is relatively low, the radio wave free space loss is small, the propagation rain attenuation performance is good, the access rate is high enough, and the equipment غير مجاز مي باشدt is relatively low. The system has a relatively good coverage capacity, usually 5km~10km, suitable for low-غير مجاز مي باشدt and large-area coverage applications at the prefecture and city level units; it can also be complemented with WLAN and LMDS to form a coverage area size and users. Density-compacted multi-layered organic complementary mode of operation. The problem is that there is insufficient bandwidth, and only 30 MHz upstream and downstream can be difficult to use on a large scale.

1.3--5.8GHz WLAN Products The 5.8GHz WLAN products use OFDM OFDM. In this band, the WLAN products are based on the IEEE 802.11a protocol, and the transmission rate can reach 54 Mbit/s and 108 Mbps in special mode. According to the WLAN transmission protocol, when the peer-to-peer application is used, the effective rate is 20 Mbit/s; in the case of point-to-six, the effective transmission rate of each image is about 500 kbit/s, which means that the total transmission data volume is 3 Mbit. /s or so. For the transmission of wireless images, the problem of "high-definition digital image transmission in wireless networks" is basically solved, making it possible to transmit digital images over a wide range of frequencies in the 5.8 GHz band, which is particularly applicable to urban security monitoring systems.

ZWD-2422 wireless high-definition transmitter wireless transmission equipment wireless transmission equipment operating frequency 4.9GHz-5.9GHz, when it receives other RF equipment or signal interference can automatically adjust to the appropriate frequency, it is generally not in the 2.4G about 5G frequency band , 3G will not interfere with the ZWD-2422's wireless HD transmission.

WLAN transmission monitoring images, more mature is the use of MPEG-4 image compression technology. This compression technology at 500kbit/s rate, compressed image clarity can reach 1CIF (352 × 288 pixels) ~ 2CIF. At a rate of 2 Mbit/s, this technology can transmit 4CIF (702 × 576 pixels, DVD clarity) sharpness images. The digitized image after compression by MPEG-4 is transmitted through a wireless channel, and with the corresponding software, it is easy to realize a networked and intelligent digital urban security monitoring system.

2.4/5.8GHz 802.11n-based products, 11n products are divided into AN and GN work at 5.8GHz and 2.4GHz, respectively, transmission rates up to 150,300,600Mbps, effective transmission rates are 60,160,300 Mbps. With high-definition With the development of cameras, this high-bandwidth 11N mode is ideal for HD camera transmission. The cooperation of high-definition cameras and high-bandwidth wireless transmission devices will gradually become the trend of wireless video surveillance.

The Broadband Fixed Wireless Access System (LMDS) system in the 1.4- to 26-GHz band is a typical 26-GHz wireless access system that uses 64QAM, 16QAM, and QPSK. LMDS has greater bandwidth and bidirectional data transmission capabilities, can provide a variety of broadband interactive data and multimedia services, to solve the bottleneck of the traditional local loop, to meet the needs of high-speed broadband data, image communications and broadband internet services. The LMDS system covers a range of 3 km to 5 km and is suitable for metropolitan area networks. Because countries in the world have different plans for the working frequency band of LMDS, their compatibility is poor, their rain attenuation performance is poor, and their غير مجاز مي باشدt is high.

2. In addition to the need for fixed-point image monitoring, the demand for moving image transmission is also very strong. Mobile video image transmission is widely used in *command vehicles, traffic accident exploration vehicles, fire control *field command vehicles and customs, oil fields, mining, water conservancy, electric power, finance, maritime affairs, and other emergency and emergency command systems. The main role is to The real-time image of the scene is transmitted back to the command center so that the commanding and decision-making personnel of the command center are immersed in the environment, the accuracy and timeliness of the decision-making is improved, and the work efficiency is improved. Fujitsu has introduced the use of public network and special technology for mobile video transmission.

2.1 The use of CDMA, GPRS, 3G public mobile network to transmit images The mobile transmission technology of CDMA wireless networks has many advantages: good confidentiality, strong anti-jamming capability, resistance to multi-path fading, flexible configuration of system capacity, and low network construction غير مجاز مي باشدt. CDMA adopts MPEG-4 compression method, compresses the picture with MPEG-4 CIF format, can reach the speed of about 2 frames per second; If adjust the picture to QCIF form, can reach more than 10 frames per second. However, for the security system, the low transmission frame rate is generally used to ensure the clarity of the transmission, because only the image clarity above the CIF can meet the needs of investigation and forensics. If you want to further improve the real-time transmission rate of live images, a simple solution is to use multiple CDMA network cards bundled to increase the transmission rate of wireless channels. There are 2~3 NIC bundled routers on the market. The غير مجاز مي باشدt of adding NICs is to increase equipment غير مجاز مي باشدts and uغير مجاز مي باشدe غير مجاز مي باشدts. With the continuous development of video compression technology, the transmission rate of 3 to 4 frames per second on a single network card is achievable, and if it can transmit 3 to 4 frames of CIF format images per second, it can meet the safety of general mobile public transport facilities. Monitoring requirements.

GPRS is a wireless packet switching technology based on the GSM system that supports specific point-to-point and point-to-multipoint services and transmits data in the form of “packet”. The GPRS peak rate exceeds 100 kbit/s, and the network capacity is only allocated when needed. This transmission method is called statistical multiplexing. The main advantage of GPRS is that it is always online and traffic-based. It can connect to the Internet at any time without dialing, keeping in touch with the network at any time, and has high resource utilization.

3G technology has replaced GPRS and CDMA gradually, and the effective rate that can be achieved is 384 kbit/s. In a network-deployed urban area, one CIF image can be transmitted in real time and can reach 20 frames per second. However, it should be noted that even if the speed is increased a lot, do not think that all mobile transportation facilities can transmit images back to the monitoring center at the same time because the concept is almost impossible for public network image transmission.

2.2 Dedicated image transmission technology for emergency emergencies For some emergency command center image transmission systems, it is often required to transmit the image of the emergency scene back to the command center. For example, there are major natural disasters, floods, fire scenes, large-scale mass gatherings, and important safety and security tasks. This kind of emergency image transmission system should not use public network transmission. It is better to use professional mobile image transmission equipment. However, at present, China has not yet specifically planned frequencies for this. There are several technologies that can be used for mobile video transmission.

2.2.1 WiMAX

WiMAX is a point-to-multipoint broadband wireless access technology. WiMAX adopts a series of new technologies such as dynamic adaptive modulation, flexible system resource parameters and multi-carrier modulation, and has a high-speed transmission capability (up to 70 Mbit/s). ~100Mbit/s) and better QoS and security control. The WiMAX 802.16e coverage can reach 1 to 3 miles and is mainly located in the mobile wireless metropolitan area network environment. However, it is difficult for 802.16e to obtain enough global unified frequencies, and the construction غير مجاز مي باشدts and equipment prices are relatively high.

2.2.2 Wireless Mesh (MESH) Technology Wireless "MESH" technology enables high-speed data communication in a closer range. With the 2.4 GHz frequency band, the effective bandwidth can reach 6 Mbit/s. This kind of technical link is simple in design, flexible in networking, and easy to maintain. Mesh Controller centralized management support, terminal data without configuration, automatically generate solutions. Support Mesh Controller hot backup links, automatic roaming switching and other functions. Support centralized management of Mesh Controller user terminals and multiple authentication methods to make the system more secure. Support Mesh Controller user flow control function, according to the type of user free allocation of traffic, support for speed limits, limit traffic, limit the Internet time and other functions.

For fixed wireless image transmission, lower غير مجاز مي باشدt WLAN technology products can be used; for mobile video image transmission, public mobile network or dedicated wireless image transmission technology can be adopted. It is hoped that more peers can further pay attention to wireless image transmission issues to promote the development of the industry.

Linear Vibrating Screen

Linear Vibrating Screen using vibration motor excitation for vibration power source, so that the material is thrown up on the screen, at the same time forward linear movement, material from the feeder evenly into the feed port of the screen machine, through the multi-layer screen to produce a number of specifications of the screen, screen, respectively from their respective export discharge. With low energy consumption, high output, simple structure, easy maintenance, fully closed structure, no dust overflow, automatic discharge, more suitable for assembly line operation.

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Autumn in September, girls under the autumn wind have long been wearing the long-awaited autumn new style, the pursuit of fashion personality, of course, women prefer different ladies with you, then how to match the fall ladies will look better? Tone Non- women's female personality independent fashion style, to help girls continue to pursue their own quality of life, advocating fashion trends, express their own unique dress personality, enjoy the innovative dress.

Black long coat in the fall can make people feel amazing, stylish autumn collocation, innovative style design, unique tailoring to help girls feel self-maturing charm, simple and stylish and full of unique temperament. Take the white can choose within the line, handsome and comes with fashion.

***y personality jacket is also bright spots, the new style design can not help but stare, a good show of ***y women's temperament, with stylish jeans, simple and unique and full of personality charm.

Like more women with information please pay attention to tone non-autumn new women.

Mn Series Wear Resistant Steel Plate

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"Peach died, burning its China," pink seems to have done all the good things in the world. Girls are also most appreciated for this color, not only can the girl silhouetted against the white and white, the most important thing is also to bring the girls to the peach, if you want to have a look forward to love, . Then Aino Qi !

In addition to removing a woman's favorite s******t, this suit can still be worth a try, with some distinctive flavor. Two-piece design, so that your summer is more beautiful, the emphasis on the era of dress inside, choose a streamlined and unconventional way to dress, and retro pink worth us to try it, full of rich senior ladies temperament texture , In no way will have any burden.

Starting from the texture, warm pink, because it is not overly fluffy shape, even fat girls can also do not have to worry about it let you can not control. Cotton and linen-type dress, which is well deducted which can be fat feeling, but also to set off more of your complexion, improve your color.

PPAL-Color Coated Aluminium

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Cube ZI3 is Aite Bai Kang (Beijing) Technology Development Co., Ltd. ATTE International Group's body sculpting underwear brand posture cubic 2010 honor landing in China, granted Aite Bai Kang (Beijing) Technology Development Co., Ltd. sole agent in the marketing of the mainland region.

ATTE International Group was established in 1979 by Dr. Yamaguchi Takatoshi. It owns international first-line brands such as Aite, Cube, and the United States lead show, is a high-tech enterprise integrating scientific research, development and sales. Since the founding of the Group, the Group has always adhered to the corporate mission of "Science and Technology Create a Healthy Beauty" and devoted itself to the research, development and innovation of life sciences and bioengineering. With the core Atte Aleft functional technology as the guide and the goal of "building a green, environmentally friendly and healthy brand" Engaged in technology development, raw materials collection, development and production and marketing services, committed to "enhance the quality of life, promoting human health," the great cause of determination to disseminate fashion and health mesغير مجاز مي باشدe to the world.

ATTE International Group pursues humane care and sticks to the global development route. After more than 30 years of growth and development, ATTE International Group has successfully become one of the top strength companies in Japan and is well-known in the world for its pioneering technologies and products that benefit human health. Over the years, the Group has actively implemented the line of brand innovation and relied on the Group's strong scientific research capability and production capacity. It has developed more than 80 kinds of health products and won many international awards. It has won wide acclaim from all sectors of the society, including the adjustment of functional underwear series, magic Stovepipe function socks series, health sports jewelry series, health sporting goods series, healthy household goods series, involving a variety of functions, advanced design concepts, excellent performance, stylish appearance in one, affirmed by professionals, successful Lead the industry trend.

In the future, ATTE Group is taking a brand-new image, innovation-driven, market-oriented, and moving forward with the goal of modern high-tech enterprises so as to create a world-class high-tech enterprise group.

GI Corrugated Sheet

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Autumn is on track, this autumn wardrobe must be less pleated, spring, summer, autumn and winter have the shadow of pleated clothes, pleated clothing is also an indispensable element of the fashion industry, with pleated clothes, how beautiful you want this fall All OK.

If you have a comfortable and stylish clothing is the best. Love fold clothes, is a brand designed for the traveling elite clothing. Originally inspired by the Japanese designer "Issey Miyake" PleatP lease series, highlighting the fashion at the same time cleverly integrated into the Oriental Zen cultural elements, graceful, low-key luxury. Known as "can be rolled to go fashion."

Never seen hate pink woman from the heart, even if the surface of the nose, the bones will be hidden with a little compassion. After all, I grew up longing for color, grow up to resist, at best, just do not think it kindness, in fact, they can not have to worry about the outside world vision.

Very Chinese style of printing, no enchanting cheongsam nor the lustful temperament of ink painting, substantial realistic mood unpredictable. Looks luxurious and will have a retro temperament. Such a beautiful pleat You do not intend to wave into the closet?

Essential Oil Bottle

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Eternal youth is the heart of every girl's desire, then the reduction of age can be said that the retention of youth with a good way, this winter is to regain the hearts of girls, we should Meng Meng da.

Feiyi new women's different fashion with let you return to youth, to show their vitality. You see such a short section of the mustard green jacket is not deep green mature and no bright green stunning, such a simple short section coat shows you a sense of cuteness, which with a gray letter shirt and A high-waist black leather s******t, seemingly simple but let themselves become different, more attractive in winter.

Such a gray coat, lapel design version of the long version of the cardigan to wear a very small girl feeling, which simply with a white turtleneck and black straight pleated s******t, the classic black and white with no cover Your light, but let you be more able to show their temperament.

Feiyi more new women, let you wear out their own beauty.

Packing Box

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Show Dai underwear with fresh colors, looking for the initial attitude of women, kind, touching. Show Dai underwear with cute fashion , so that girls recover her youthful insights, lively, passionate. Show Dai underwear with the ultimate ***y, so that all women return to the most original share of charm, traceless, elegant. Show Dai underwear with classical luxury, so that women walk back to the most confident and elegant ultimate noble.

Show Dai specializes in the physical analysis of women, is committed to discover the beauty of women's body, shaping the perfect female sensual curve. "Confident woman, happy life" because show Dai, so we will color the life of the more gorgeous ... ... elegant without publicity, concise and not simple, tailor every detail, reveal the wonderful show Hideyoshi.

Show Dai with a ubiquitous surprise, reflecting the joy of life, bring you unparalleled caring feelings. Young spirit, exquisite comfort, natural beauty, show Dai to romantic style, to bring you elegant quality of life, showing the dazzling light of femininity! Confident, like a show Dai!

PET Bottle

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Wire and cable products are used in different occasions, so the functional requirements are many and very extensive. Looking at the whole, its primary function is summarized as:

1. Electrical function Conductive function --- Most of the goods require outstanding electrical conductivity, and the individual product needs have a certain resistance scale.

Electrical insulation function - insulation resistance, dielectric coefficient, dielectric loss, electrical resistance and so on.

Transmission characteristics - refers to high-frequency transmission characteristics, anti-jamming characteristics.

2. Mechanical function refers to tensile strength, elongation, bending, elasticity, softness, resistance to sensation, abrasion resistance, and resistance to mechanical forces.

3. Thermal function refers to the product's temperature rating, working temperature, heat and heat dissipation characteristics of power transmission wire and cable, current carrying capacity, short circuit and overload capacity, thermal deformation and thermal shock resistance of constituent data, thermal expansion of data, and impregnation. Dropping function of coating data.

Wire and cable 4. Corrosion resistance and weather resistance: Resistance to galvanic corrosion, biological and bacterial corrosion, chemical (oil, acid, alkali, chemical solvents, etc.) corrosion, salt spray, light, cold, mildew, and moisture Wait.

5. Aging function refers to the ability of commodities and their constituent materials to adhere to their original functions under the effect of mechanical stress, electrical stress, thermal stress and other various external factors, or the effect of external weather conditions.

6. Other functions include the characteristics of some data (such as the hardness of metal materials, creep, compatibility of polymer data) and some special characteristics of the product (such as non-flammability, atomic radiation resistance, insect resistance, delay) Transmission, and energy damping, etc.)

The functional requirements of commodities are first of all put forward from the aspects of the use of various detailed commodities, the conditions of use, and the cooperation and cooperation of supporting equipment. In the functional requirements of a commodity, there must be some of the most important ones. It has a decisive effect and should be strictly required. Some are affiliated. Sometimes some elements are mutually restrictive. Therefore, it is necessary to conduct a comprehensive study and analysis of inductive thinking.

Roll On Bottle

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After the Mid-Autumn Festival, autumnal weather began to cool down. "Advanced dew" is the time to move from "bare shoulder" to "bare-legged." Not necessarily reveal the more the more ***y, and sometimes Lulu Lu exposed even more touching.

Cut the length of the s******t need to be based on height to choose, tall girls are more suitable for this high-fork design. In the middle of the fork design can successfully shift the line of sight in your split part, thus ignoring the thick calf.

Belt strap s******ts are Evergreen hot models, but sometimes inevitably seem too naive casual. Vest s******t design material split dress, with a retro shirt, easy GET to the popular elements while leaving you daily commute full of femininity.

Blue is very deep, is a mature color, into the split design, feel immediately young and rich sense of design.

Professional suits give a serious old-fashioned image, semi-s******t split design can break the unchanging single tone, but also small Lu ***y. Make sure you wear a super confidence!

The last sentence: sometimes fork too high, too much exposed can be very vulgar, just right of the fork is a modern style high-quality embodiment.

More autumn new clothes please pay attention RMK!

MARINE PRODUCTS

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The weather is getting hot, many sister also started a variety of dress up, trying to stunning this summer. In fact, you chase the tide, will always see the back of the trend, smart girls should let the trend come to you. Black and white classic wear, wearing a different flavor in the original classic, the classic is to stand the test of time and win out of the winner. Black and white color, this summer's essential is this.

Very retro a long dress, worn on the body effect is very good, slightly loose version of the model, but very significant figure, but also added a bit casual temperament. Printed behind the more fashion flavor to write, and clothing at the split with a small ***y. Stripe has always been a very classic element, stand the test of time, wild and significant temperament.

Summer most versatile round neck sleeve white shirt, wavy corrugated cuffs, it is very beautiful. With this year's popular s******ts, classic black and white wear, there are different tastes. Ladies and noble temperament I give 101 points, more than I am afraid of you proud.

HEAT EXCHANGE PRODUCTS

Heat Exchange Products,Low Carbon Steel Tube,Stainless Steel Tube 304,Stainless Steel Fin Tube

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