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No. 28/2013 (Sept. 9, 2013)
3D printing is the process of creating three-dimensional solid objects from digital designs, created e.g. in AutoCAD. The materials used to form the designed components are various kinds of plastics. The whole process of "production" is the deposition of polymer materials on a movable table, layer by layer, until the object is complete.
Printing a 3D object directly from Windows 8.1
The very concept of 3D printing is not new. The first device of this type was built in 1984 by Chuck Hull, an employee of 3D Systems. However, we had to wait for a rapid development of this technology until now. Currently, the market is worth $ 1.7 billion and will double by 2015. It is sometimes called the third industrial revolution.
Until now, in order to take advantage of the benefits of the revolutionary technology and start 3D printing process, the user should export the file with a 3D project to the application supplied with the 3-dementional printer. Microsoft came to the conclusion that Windows should help users to get their work done easier. Since October, a 3D model can turn into reality with a single mouse click on "Print" button. By default, the OS will support printers from 3D Systems, Afini, AutoDesk, Industries, Makerbot, Netfabb.
3D printing technology is not intended for home use only. An example is General Electric which produces with this method some components of turbines used in modern aircraft. One of the main beneficiaries is medical technology - after scanning any part of a human body it is possible to make a perfect model that may be very useful to prepare a surgery, make a replacement etc.
In theory, everything seems possible, the users can basically make copies of any things feasible in this technology, without leaving their homes - but what about patent rights? If we need a tool or a substitute for an original product, are we allowed to make a perfect copy on our own? What about the law?
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Joint boxes are used to protect fiber optic splices from mechanical damage and adverse effects of weather conditions. Universal designs of the boxes enable various applications, including branching optical lines and repairing damaged cables.
The ULTIMODE HMS-H24-A L56024 flat straight-through joint box is dedicated for overhead lines and cables buried in the ground. The joint box with two trays can protect up to 24 splices. The ULTIMODE HMS-V96-A L56096 vertical straight-through joint boxj can protect up to 96 splices (4 splice trays - capacity of 48 splices, or with stacking - 96 splices) and can be mounted on poles, posts, facades etc.
Multiswitch system with a star topology in the Dialog Center in Lodz, Poland.
The SMATV system has been deployed in "CENTRUM DIALOGU im. Marka Edelmana". The system distributes satellite TV signals from Hotbird 13.0E, DVB-T and FM broadcasts. The installation and configuration for the site were carried out by GKJ SYSTEM.Due to the architecture of the building, the company decided to use star topology, with 5-in / 24-out Terra MR-524 R70624 multiswitch in the central point. The multiswitch is put into TPR-8 R90553 installation box (700x500x200 mm). The outputs of the multiswitch are connected to 24 outlets located in rooms throughout the building.
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Thanks to the fact that all the signals are distributed from a single antenna set, there is no negative impact on the high aesthetic values of the building. The set includes terrestrial DVB-T antenna A2660, FM antenna Dipol 1RUZ B A0210, 1.2-meter satellite dish, and QUATRO LNB Inverto BLACK Ultra A98266. All the components have been placed on steel antenna mast E903830, mounted to the wall with the OMM-50L13 E8533 wall bracket.
Lightning protection of large LAN and CCTV systems.
Extensive systems with long external copper lines are subjected to surge voltages induced by lightning. The dangerous voltages can be suppressed by dedicated devices connected on the both sides of each line, e.g. Netprotector 4p PoE J2838 (for lines using twisted-pair cables) and OPV-4 M17014 (for coaxial cabling).
A complete insensitivity to external electromagnetic fields is ensured only by fiber optic lines. The choice of the optical medium for transmission of any kind of signals means full galvanic isolation between the devices on the both ends of the link. Optical links can transmit signals over much greater distances than copper lines (in the example - up to 20 km).
A video link in the form of optical line ensures galvanic isolation between devices
and completely eliminates the risk of overvoltages induced in the transmission path
and completely eliminates the risk of overvoltages induced in the transmission path
Recording surveillance video on GOODRAM SD cards.
In systems where there is no need for continuous recording and the cameras are basically used for live monitoring, local video recording on SD cards is the optimum solution for having video footage in case of emergency. This approach reduces the cost of investment by the value of a DVR and hard drive. Data backup on SD cards is also recommended for IP cameras in IP CCTV systems based on NVRs, to protect the surveillance data in case of a network failure.- Schedule - it is possible to define three periods of continuous recording for any day of the week
- Alarm - the recording is triggered by motion detection or external alarm signal (through alarm input); the user can define pre-alarm and post-alarm periods
The image quality, frame rate, resolution and bandwidth should be adjusted in the camera settings so that the card could be able to store video coverage from a specified number of hours/days.
The table below shows the relationship between the maximum recording times and average bit rates of the video streams from the cameras:
The table below shows the relationship between the maximum recording times and average bit rates of the video streams from the cameras:
| 16 GB | 32 GB | 64 GB | |
| 1 Mbit/s | 1.5 days | 3 days | 6 days |
| 2 Mbit/s | 18 hours | 1.5 days | 3 days |
| 3 Mbit/s | 12 hours | 1 day | 2 days |
| 4 Mbit/s | 9 hours | 18 hours | 1.5 days |
Mobile Internet - how to select the antenna? Part 2 - 3G.
In the last issue we discussed how to select an antenna for LTE service. 3G (UMTS system) allows users to make voice calls, video calls, send text messages and upload/download digital data. HSDPA and HSUPA are enhanced 3G protocols allowing for data rates up to 21.6 Mbps (download) and 5.76 Mbps (upload). HSPA+ broadband standard defined by the 3GPP consortium provides mobile access to the Internet at maximum speeds of 42 Mbps (downlink) and 11 Mbps (uplink).Before choosing an antenna, it is necessary to know that the operating band of the service is 2100 MHz. There are broadband antennas both for 900 MHz and 2100 MHz, but they usually have lower energetic gain. Another issue is the application of MIMO technology in the modem. One of the criteria for selecting an antenna is the distance to the base station - in the case of longer distance the gain of the antenna has to be higher.
UMTS (3G), HSPA+ (1900-2100 MHz) antennas for the distances from base stations
below 3 km | above 3 km |
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GPRS (900 MHz) antennas for the distances from base stations
below 4 km | ---above 4 km-- |
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New products offered by DIPOL:
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Worth reading:
Terabit level graphene antennas. Researches from Georgia Institute of Technology developed plans for an unusual antennas made of graphene - a material which is the leading candidate for replacing silicon in integrated circuits. Such antennas made of the "material of the future" will be capable of data transfer speeds of 1 Tbps at a distance of 1 m, and theoretically even up to 100 Tbps at distances not exceeding a few centimeters... more
The hardware architecture of a device
for terabit wireless communication
(source: gatech.edu)
for terabit wireless communication
(source: gatech.edu)
Optical fiber fault location. Tests of optical links require a bit more advanced tools than in the case of copper cabling. When the devices on both sides of a link work properly, but the connection fails, it must be a fault of the transmission medium.
How to check the fiber? There are three methods... more
How to check the fiber? There are three methods... more
Working with visual fault locator. The picture shows "leakage" of light from the cable -
the damage is likely the result of improper handling of the fiber when connecting devices.
the damage is likely the result of improper handling of the fiber when connecting devices.
How to improve home WiFi coverage? Wireless range extender TP-LINK TL-WA850RE N2946 is designed to increase the range and signal strength of an existing wireless network to eliminate dead zones. The device is compliant with N standard (speeds up to 300 Mbps). Due to small dimensions and integration with AC plug, it can be plugged into any AC outlet in a room. Thanks the Ethernet port, the extender can also be used as a WiFi card for any device equipped with Ethernet interface... more
