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How Does A Home Security System Work?
Posted by nick_niesen on November 1st nike shoes wholesale , 2010


Home Security System are used throughout the United States, people know what Burglar alarms are and what they are used for. Nevertheless they may not know how they operate. Let?s see how this protection system works in detail.


The Circuit


Home Security Systems are a simple electric circuit. To open or close a light, you simply throw a switch. In a burglar alarm it?s the same except the switch detects the movements of the intruder such as the opening a door or window.


Two categories


In a closed-circuit system, the electric circuit is closed when the door is shut. This means that as long as the door is closed, electricity can flow from one end of the circuit to the other. But if somebody opens the door, the circuit is opened nike air max mens wholesale , and electricity can't flow. This triggers an alarm.


In an open-circuit system, opening the door closes the circuit, so electricity begins to flow. Also in this system, The Alarm is triggered when the circuit is completed.


Magnetic sensor
A magnetic sensor in a closed circuit consists of a few simple components.


- a battery powering a circuit
- a spring-driven metal switch built into a door frame
- a magnet embedded in the door, lined up with the switch
- a separately-powered buzzer with a relay-driven switch.


Control box


The control box is hooked up to one or more alarm circuits, but it also has its own power supply. Once the alarm is triggered nike air max womens wholesale , the control box won't cut it off until somebody enters a security code at a connected keypad. In most installations the control box is kept in a veered place so that the burglar can't even think of disabling it then the alarm goes off.


KHARTOUM, Nov. 4 (Xinhua) -- The visit of South Sudan President Salva Kiir Mayardit to Khartoum on Tuesday has sent positive signals that the two sides are pressing ahead towards settling their differences on the border and economic issues, analysts said.


Kiir's visit, however, came under exchanged accusations between Khartoum and Juba of supporting armed groups in the two countries.


The latest accusation, accoding to South Sudanese media nike trainers wholesale , said Sudanese planes have bombarded sites in South Sudan's Bahral- Ghazal State, claiming that 32 civilians were killed.


"It is clear that there are attempts by some forces in South Sudan to bring the relationship between Khartoum and Juba back to square one after the recent closeness between the two countries," Dr. Mohamed Hassan Saeed, a Sudanese political analyst, told Xinhua Tuesday.


"It was a positive matter that the visit took place despite the accusations," he said nike air max cheap wholesale , adding that "the visit has sent a clear message that the leaderships in Sudan and South Sudan are resolutely pressing ahead towards settling their differences."


The final communique, issued at the conclusion of the joint talks between president Kiir and his Sudanese counterpart Omar al- Bashir in Khartoum Tuesday, carried clear answers regarding the security issue where the two sides urged for immediate commencement on establishing the demilitarized zone along the joint border and stoppage of provision of support and shelter for the armed groups in the two countries.


According to the communique, the two sides further expressed readiness to work together to increase the oil production at Fuluj and Adar oil fields in South Sudan and assist the technicians to resume production at Unity oil field in South Sudan, which ceased production due to the clashes between South Sudan army and defectors loyal to former vice-president Riek Machar.


In this respect, Abdul-Illah Suleiman nike air max wholesale , a Sudanese economic analyst, said the oil issue constitutes a great importance for both Sudan and South Sudan.


"The two countries are facing similar economic problems, and therefore the halting of the South's oil production is also in the interest of Sudan where the oil flows through its oil utilities and helps it get hard currency," Suleiman told Xinhua.


"South Sudan, in turn, does not have any resources other than oil wholesale air max cheap nz , not to mention that it is facing difficult conditions because of the security tension which caused its oil production to decrease. Therefore, if Sudan supported the South's efforts to resume production at unity oil field, then that will achieve common interests for the two sides," he noted.


In September 2012, Sudan and South Sudan signed a cooperation agreement in the Ethiopian capital of Addis Ababa under the patronage of the African Union.


The agreement included a package of understandings related to security, citizens' status wholesale air max nz , border and economic issues. However, the signed agreements did not tackle the issues of Abyei and border demarcation.


The issue of the border areas constitutes one of the biggest barriers hampering the settlement of differences between Sudan and South Sudan where the two countries dispute over five border areas, including the oil-rich Abyei.


BEIJINGNANJING, May 21 (Xinhua) -- The International Maritime Organization has ratified the performance standard of a receiver of the shipborne BeiDou Navigation Satellite System (BDS), the Ministry of Transport revealed Wednesday.


This is the first BDS to be standard approved by an international organization. It marks the first step for China's home-grown system in its quest to go global, according to the ministry.


The move is key to the application of BDS in the international maritime field and its industrial development wholesale air max 2019 nz , the ministry said.


The first satellite for the BDS plan was launched in 2000. China wants to expand the regional navigation system to global coverage by around 2020.


Also on Wednesday, BDS spokesman Ran Chengqi said at a symposium in Nanjing that China has started the last phase of the BDS development plan, and is expanding the system's market share at home.


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