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No. 16/2016 (April 18, 2016)
Nanotechnology - the hope to improve the performance of batteries.
Scientists have long been looking for ways to create long lasting and efficient batteries. It seems that nanotechnology (the field of technology and science manipulating matter with at least one dimension sized from 1 to 100 nanometers) creates an opportunity for a breakthrough in rechargeable battery market. Improved battery performance is the key to continued growth and success of many modern technological solutions connected with solar and wind energy, as well as of electric cars. The goal is to accumulate more energy per mass or volume, ensure higher efficiency and durability, increased safety, and lower cost. The use of nanotechnology may increase the size and area of the electrodes of the batteries, which absorb and give back energy. Such electrodes are more spongy, so that they can absorb more energy during charging.HE3DA company based in Prague has created three-dimensional electrodes that successfully passed tests. They hope to introduce the batteries to the market at the end of this year. "In the future, it will be the mainstream," said Jan Prochazka, the president of HE3DA. The products are mainly directed to industries requiring high capacity, powerful batteries (electric cars, renewable energy systems) where the more efficient electrodes will be the key for progress in these high-power applications. The tested batteries have an internal cooling system, so they will be more secure. Protection against overheating and explosion is in fact a major problem in the operation of large sets of Li-ion rechargeable batteries.
The tests of the HE3DA rechargeable battery with nanotechnology solutions included starting of a Lincoln car
(source: youtube.com)
(source: youtube.com)
George Crabtree, a scientist at the Argonne National Laboratory in the United States and director of the Joint Center for Energy Storage Research, sees the solution as "a very interesting battery." "There's no doubt that increasing the size of the electrodes that is making them 3D instead of 2D would be a big step forward. That is actually a very right target for advancing lithium ion batteries," he said. "The energy is stored in the electrode, so if you can make the electrodes bigger, say 10 times bigger, then you can have 10 times the amount of energy stored on one charge."
The HE3DA company is now in the forefront of Czech companies implementing nanotechnology, thus gaining international interest. The company production plant will be financed by a Chinese investor whose initial contribution is almost 1.5 billion crowns (USD 62 million). This amount is to be doubled at a later stage of development.
The HE3DA company is now in the forefront of Czech companies implementing nanotechnology, thus gaining international interest. The company production plant will be financed by a Chinese investor whose initial contribution is almost 1.5 billion crowns (USD 62 million). This amount is to be doubled at a later stage of development.
High quality of Signal RACK confirmed by Certificate of Conformity.
At the request of DIPOL company, KOMAG Institute of Mining Technology has tested Signal hanging RACK cabinets. The tests have confirmed the compliance of the cabinets with general safety requirements contained in Chapter II of the General Product Safety Directive (2001/95/EC) of 3 December 2001 and in the guidelines of the EN 60950-1:2007 international standard. |  |
Certificate of Conformity for SIGNAL RACK cabinets
issued by KOMAG Institute of Mining Technology
issued by KOMAG Institute of Mining Technology
How a thermal imaging camera works.
"Normal" analog or IP cameras used in video monitoring systems capture visible and (usually in night mode) near infrared radiation (in total: 300-950 nm) reflected from the objects in the field of view. The sources of the radiation can be the daylight or artificial lighting systems, including IR illuminators. Thermal imaging cameras work properly without any additional source of lighting. Each body with a temperature above absolute zero emits infrared radiation. The infrared cameras may use wavelengths between 1-20 micrometers.
- CCTV camera captures visible light provided by the sun or lamps and reflected from the monitored objects
- CCTV camera with IR illuminator operating in IR mode captures infrared light reflected from the monitored objects
- thermal imaging camera captures infrared radiation generated by objects, so that does not need any source of visible or IR light
Thanks to the relationship between temperature and the intensity and spectral characteristics of the radiation, taking into consideration the features of the emitting surfaces, the image from an infrared camera can show the distribution of temperature on the surfaces of the objects in the field of view, so it can be graduated in temperature scale divisions. This enables the user to read the temperatures of the interesting points on the surface of various objects. Due to no lighting required for proper operation of the camera, the device remains invisible in the night (an intruder can be unaware of its presence).
H.264+ compression in Hikvision cameras.
Due to the emergence of CCTV cameras with higher and higher resolutions, the generated data streams continually grow and occupy more and more space on hard drives. For example, a 1 TB hard drive can store continuous recordings from 22 days, captured by a 2-megapixel camera with recommended bitrate of 4096 kbps (CBR) and 25 fps refresh rate. In the case of a 5-megapixel camera and the recommended bitrate of 9216 kbps (CBR), the same refresh rate of 25 fps and continuous recording, the storage capacity is reduced to approx. 9 days.Taking into account the fact that the H.264 codec was not created and optimized for video monitoring and the problems connected with the increase of the demand for bandwidth and storage capacity in the case of modern cameras, Hikvision has developed a new way of video encoding, H.264+. The algorithm is based on H.264 compression, but optimized for video surveillance. The results are very good, ensuring reduction of the data streams by 50-70%, while maintaining the same image quality compared with the H.264 codec.
Cameras with H.264+ compression
Cameras with H.264+ compression
Comparison of H.264 with H.264+
(source: youtube.com)
(source: youtube.com)
New-generation optical node for SMATV systems.
Optical receivers (nodes) convert optical signals into an electrical form. The electrical signals are provided to the subscriber's devices (forward path), and in the case of using return path (usually for broadband Internet), other signals are transmitted in the opposite direction. The choice of the appropriate optical receiver depends on the required parameters such as:- sensitivity of the optical input - the higher, the easier the designing and implementation of the network - with the same output power of the transmitter the links can be longer or the splitting ratio can be higher,
- maximum output level of the RF (electrical) output - directly determines the size of the copper distribution system that does not require the use of additional TV amplifiers; devices with a level higher than 80 dBμV allow splitting the RF signal into at least ten signal lines.
Recently DIPOL has introduced the TERRA OD-006 R81762 optical node. The optical receiver features high sensitivity (-6...0 dBm). The maximum RF output level of 80 dBuV is suitable for distribution of the channels via passive splitters/taps to multiple outlets (up 10 or so), without a need for an additional amplifier.
Optical Node TERRA OD-006 (FTTH receiver)
The table below groups TERRA optical receivers available within TERRA optical equipment
Two IP cameras on a pole, video transmission via optical fiber.
Extensive monitoring systems with cameras placed on poles require careful planning, including the choice of equipment necessary for signal transmission via optical fibers and for power supply. Due to limited space, installers have to minimize the number and size of the pieces of the additional equipment and the size of protective enclosures.In the case of two IP cameras placed on one pole and application of optical transmission medium, it is necessary to use suitable Ethernet switch, media converter, power supply for the cameras, power supply for the switch (such small switches often operate at a different voltage than IP cameras), power supply for the media converter and a fiber optic box for terminating the transmission fiber optic cable and connecting it to the media converter.
In such cases, the ideal solution is to use the L11542 media converter with integrated 2-port switch. This way there is no need for additional switch and power supply. The number of connections is also limited to a minimum. The concept is presented in the diagram below.
The application of the L11542 Ethernet media converter with built-in switch for the transmission of signals from two IP cameras via single-mode fiber. When the length of the fiber optic cable inside the building is above 15 m, the whole cable has to have LSZOH jacket (a universal cable). Typical outdoor fiber optic cables do not have LSZOH jackets, so they cannot be installed inside buildings over distances longer than 15 m.
 | Alcohol-soaked Wipes FIS L5922 soaked with alcohol, used for cleaning optical fibers prior to the splicing process. Thorough cleaning of the fibers reduces signal loss in the splices. | |
 | UTP Patch Cable Cat5e (0.25m, blue) J20001 with RJ45 connectors (8P8C modular plugs) is mainly used for connecting computers and other devices to Ethernet networks (LANs). | |
 | Switching Power Supply (12V/250mA JACK 3.5 (+)) D0014 in conjunction with C0397 RF/DC separator (power supply injector) provides 12 VDC supply voltage to an antenna preamp/amplifier, via the same coaxial cable which transmits RF signals from the antenna.The C0397 injector should also be installed, for instance, between an antenna amplifier and a passive splitter that cannot pass DC power. | |
News
Hikvision sets at special prices till May 21, 2016. The promotion is addressed to CCTV installers. Each of the promotional sets is composed of a DVR and two or four TURBO HD HD-TVI cameras. Of course, one can buy additional HD-TVI cameras, if needed.
Promotional HIKVISION sets
Worth reading
Multiswitch SMATV system for two satellites in an apartment building. The most flexible multiswitch installations in multi-story buildings are based on 9-cable systems. The 9-cable bus is split into subnetworks for apartments in each staircase, and then on each floor, by a suitable tap providing signals to a "story" multiswitch. This way the network can be shaped according to the actual requirements. In the case of growing number of subscribers/outlets, it is enough to use multiswitch with a greater number of outputs.. >>>more
An example of SMATV system in a multifamily building (4 staircases, 3 stories). The system distributes programming from terrestrial transmitters and two satellite positions. It is based on bus topology, with SDQ-908 R70529 splitter, SD-920 R70526 taps, and TERRA MV-908L R70858 multiswitches. All active components of the system are powered from the SA-91L R70901 broadband amplifier.
TRISET - coaxial cables for modern TV systems
