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80 Sentences With "alarm signal"

How to use alarm signal in a sentence? Find typical usage patterns (collocations)/phrases/context for "alarm signal" and check conjugation/comparative form for "alarm signal". Mastering all the usages of "alarm signal" from sentence examples published by news publications.

Mr Mattis's resignation should serve as an alarm-signal to Congress.
The VDMA engineering association said the vote was "an alarm signal" for companies.
Hospitals are seeing a leap in sick people and that is an alarm signal.
Hospitals are seeing a leap in sick people and that is an alarm signal.
The alarm signal is also a truly unique form of non-vocal communication in birds.
"Britain's decision to leave the EU is an alarm signal for companies," said VDMA managing director Thilo Brodtmann.
The Prosecutor General's office said these proposals were an alarm signal, adding that prosecutors had not been consulted.
The life ahead was suddenly not a simple question mark or a blank slate but a flashing alarm signal.
That is not exactly an alarm signal, but it does show that the Fed may not be far from its medium-term inflation target of 2 percent.
"The attack on a representative of our state is an alarm signal ... combating extremism and terrorism of all kinds is a central matter for this government," he said.
This was the final piece of the puzzle, solidifying the importance of that narrow P8 feather in communicating danger, and showing that the other birds react to the alarm signal.
"If something didn't send an alarm signal that we needed to have serious assets or protection and convoying of our vessels in that area, then I want to know why not," he said.
" President Emmanuel Macron of France called Britain's departure from the bloc a "historic alarm signal that must ring in each of our countries to be heard by all of Europe and make us reflect.
"It's an alarm signal when a great German footballer like Mesut Özil no longer wants to be in his country because of racism and does not feel represented by the German football board," she said.
Dr Murray and his associates theorised that if this odd-shaped primary is responsible for the take-off whistle, then that would be strong evidence that the whistle is an evolved alarm signal, and not an accidental cue.
The research team behind the study—centered at Australian National University—thought it was possible that the whistling flight of the crested pigeon could be one of these elusive, non-vocal "instruments," potentially used as an alarm signal for other flock members.
BERLIN, June 24 (Reuters) - Germany's VDMA engineering association said on Friday that Britain's vote to leave the European Union is an alarm signal for companies that will hurt investor confidence in Europe and lead to a fall in German machinery exports to Britain.
Such an event initiates an alarm signal. This technology is considered obsolete by many alarm professionals, and is not actively installed.
A disturbed animal will give its alarm signal, thereby alerting all animals in the vicinity, including the animal being tracked down.
Chemical structure of hypoxanthine-3N-oxide (H3NO), a major component of the "schreckstoff" mixture In 1938, the Austrian ethologist Karl von Frisch made his first report on the existence of the chemical alarm signal known as Schreckstoff (fright substance) in minnows. An alarm signal is a response produced by an individual, the “sender”, reacting to a hazard that warns other animals, the receivers, of danger.(Smith 1992). This chemical alarm signal is only released when the sender incurs mechanical damage, such as when it has been caught by a predator, and is detected by the olfactory system.
The alarm was sent by the operator on the ship in distress transmitting the radiotelegraph alarm signal (auto-alarm) signal—twelve extra-long dashes, each lasting four seconds with a one-second gap between them, and transmitted in A2 (modulated CW). The alarm signal was normally sent with a mechanical or electronic timing circuit to ensure it was sent accurately. However, ships radio room clocks typically had markings on the dial to guide operators in sending the signal manually. The regulations for the auto-alarm were defined in the 1927 Safety of Life at Sea (SOLAS) international maritime regulations, and in Article 19, § 21, of the General Regulations annexed to the International Radiotelegraph Convention, 1927.5 5.
3rd class passengers did not have reserved seats. Punkah fans were provided only in 1st and 2nd class. The cars were fitted with vacuum brake and passenger alarm signal.
At the top of the building, there was always a bundle of dry wood to be burned immediately in case of danger, transmitting the alarm signal to the towers nearby.
In addition to communication towards predators, stridulation can be seen as a possible alarm signal to other catfish, in the sense of warning nearby individuals that a predator is near.
The Auto Alarm receivers were designed to activate upon receiving four such dashes. Once four valid dashes are detected, the automatic alarm is activated. The distressed ship's operator would then delay sending the message itself to give off-watch radio operators time to reach their radio room. The radiotelephony equivalent of the radiotelegraph alarm signal is the radiotelephony alarm signal, which is the transmission of alternating tones of 2200 Hz and 1300 Hz, with each tone having a duration of 250 ms.
Remote error indication (REI) or formerly far end block error (FEBE) is an alarm signal used in synchronous optical networking (SONET). It indicates to the transmitting node that the receiver has detected a block error.
T. rugatulus ants use such chemicals as trail pheromones. The location of the chemical in relation to the nest was extremely important in their behavioral responses. When an alarm signal was presented far away from the nest, the ants were reported to run away from the scent, whereas if the chemical was present just outside their nest, they would run towards it. It is thought that ants may interpret the close alarm signal as a cry for help and attempt to save whoever was emitting the chemical.
In addition, during this silent period all coastal and ship stations were required to monitor the frequency, listening for any distress signals. All large ships at sea had to monitor 500 kHz at all times, either with a licensed radio operator or with equipment (called an auto-alarm) that automatically detected an SOS alarm signal. Simulated auto-alarm signal. Shore stations throughout the world operated on this frequency to exchange messages with ships and to issue warning about weather and other navigational warnings. At night, transmission ranges of 3,000–4,000 miles (4,500–6,500 kilometers) were typical.
The alarm signal is defined as an AM signal (A3X and/or N0N emissions), containing a swept tone ranging from 1600 Hz to 300 Hz (either upwards or downwards), with 2-4 sweeps per second. EPIRBs with an AIS transmitter are allocated MMSI numbers in the range 974yyzzzz.
Damage sustained to Forrestal On 31 July, Forrestal arrived at Naval Air Station Cubi Point in the Philippines, to undertake repairs sufficient to allow the ship to return to the United States. During welcoming ceremonies, a fire alarm signal alerted crews to a fire in mattresses within the burned-out compartments.
It is not used in cytosolic protein synthesis of eukaryotes, where eukaryotic nuclear genes are translated. It is also not used by Archaea. In the human body, fMet is recognized by the immune system as foreign material, or as an alarm signal released by damaged cells, and stimulates the body to fight against potential infection.
They perform a visual inspection and either give a loud alarm signal, or remain still, keeping an eye open. The Gambian epauletted fruit bats are unlike other bats because they use sight rather than echolocation to find food. They also rely heavily on their smell because they use it to locate food and establish bonds with one another.
Angrily, they set off to the TV studio to find him. Maurice and his girlfriend manage to flee to a shopping center. The gang follow them into the center, then spread out to search, using an alarm signal to keep in touch. During the search Rico accidentally kills Béru, a fellow gang member, and blames the murder on Maurice.
"A context-dependent alarm signal in the ant Temnothorax rugatulus." Journal of Experimental Biology 217.18 (2014): 3239-236. This specific chemical's name is 2,5-dimethylpyrazine. Like many chemicals, T. rugatulus use this chemical for different reasons and the context in which the chemical is received by another individual will give it clues as to its current situation.
However, historian David Hackett Fischer asserts that the township as a whole was alerted by the firing of an alarm signal from the nearby village of Carlisle, a Northern precinct of Concord, thereby creating a more general internal alarm throughout the vicinity.Fischer, 146. Regardless, once roused, Robinson moved in haste to join his fellow Minutemen. Robinson, Rev.
Zuberbuhler, K. (2000) Interspecies semantic communication in two forest primates. Proc R Soc Lond Ser B Biol Sci 267:713–718. When one species elicits an alarm signal specific to a certain predator, the other species react in the same pattern as the species that called. For example, leopards hunt both species by capitalizing the elements of stealth and surprise.
These chemicals are also utilized by the giant mesquite bug to signal to others of the same life stage. As pheromones, they stimulate aggregations of giant mesquite bugs of the same life stage to disperse. However, nymphs do not respond to adult secretions and vice versa. 4-oxo-(E)-2- hexenal functions as both an alarm signal and a defense mechanism.
Infants may also be more likely to use distress calls to catch their mother's attention in order for her to produce an alarm call. Infants might also lack the physical ability to produce alarm calls or lack the necessary experience to classify unfamiliar objects as dangerous and worthy of an alarm signal. Therefore, alarm calling may require advanced levels of development, perception, categorization, and social cognition.
The units have a useful life of 10 years, operate across a range of conditions , and transmit for 24 to 48 hours. The radiotelephony locator beacon sound made by PLBs and some EPIRBs.The alarm signal is defined as an AM signal (A3X and/or N0N emissions), containing a swept tone ranging from 300 Hz to 1600 Hz (upwards), with 2–4 sweeps per second. PLBs shall sweep upward.
Instruments of this type resemble the old type of watchman's rattle. A cog rattle up to 2 metres high, the ""matraca"", has been used in Spain, Portugal and the New World, especially to summon worshippers to church. They are used as an alarm signal and as a noise-maker at sports gatherings. They are used universally to scare birds and animals, and in a simpler form to amuse children.
The electromagnetic parking sensor (EPS) was re- invented and patented in 1992 by Mauro Del Signore. Electromagnetic sensors rely on the vehicle moving slowly and smoothly towards the object to be avoided. Once an obstacle is detected, the sensor continues to signal the presence of the obstacle even if the vehicle momentarily stops. If the vehicle then resumes moving backwards the alarm signal becomes louder as the obstacle is approached.
One of the first hypotheses for the evolution of schreckstoff centered on W.D. Hamilton’s theory of kin selection.(Hamilton 1963, 1964a, 1964b). Under the theory of kin selection, the sender of the chemical alarm signal would be willing to incur the costs of sending this signal if the benefits to related individuals were sufficiently high. In a situation where the sender of the signal is paying great costs (i.e.
On 20 September 2003, an unusual incident occurred near Villeneuve-Triage station. A southbound train stopped at 18:50 on the central track near the station due to an incident. Passengers aboard were invited to step off the train by the left, as track 2M has been neutralised by the regulators. However, due to a misuse of the alarm signal by nervous passengers, some doors opened on the right.
Alarm calls have been studied in many species, such as Belding's ground squirrels. Characteristic 'ticking' alarm call of a European robin, Erithacus rubecula In animal communication, an alarm signal is an antipredator adaptation in the form of signals emitted by social animals in response to danger. Many primates and birds have elaborate alarm calls for warning conspecifics of approaching predators. For example, the alarm call of the blackbird is a familiar sound in many gardens.
Wire-Free Protection Ltd. Depending on the system's layout, the NAC's may or may not activate for prealarm conditions. In a two-stage system, the NAC's are typically coded to a special first-stage coding, or in some situations where a loud alarm signal could be disruptive, chimes will activate. If there is a voice evacuation system, it will usually instruct building occupants to await further instructions while the alarm is being investigated.
Depending on the model, the relay has multiple methods to detect a failing transformer. On a slow accumulation of gas, due perhaps to slight overload, gas produced by decomposition of insulating oil accumulates in the top of the relay and forces the oil level down. A float switch in the relay is used to initiate an alarm signal. Depending on design, a second float may also serve to detect slow oil leaks.
Stearns was the son of Edward Ray and Eliza Tyler Barker Stearns of Weld, Maine. As a youth, he worked on a farm. He studied telegraphy at Newburyport, Massachusetts, where he became manager of the office. From 1855 to 1869, he was superintendent of the Fire Alarm Telegraph Company of Boston, Massachusetts and was the first to take out patents on the use of reversed currents in connection with the fire alarm signal system.
Cross- zoning is a strategy that does not require a new keypad. Using multiple sensors to monitor activity in one area, software analyses input from all the sources. For example, if a motion detector trips in one area, the signal is recorded and the central-station monitor notifies the customer. A second alarm signal—received in an adjacent zone within a short time—is the confirmation the central-station monitor needs to request a dispatch immediately.
One timeslot (TS0) is reserved for framing purposes, and alternately transmits a fixed pattern. This allows the receiver to lock onto the start of each frame and match up each channel in turn. The standards allow for a full cyclic redundancy check to be performed across all bits transmitted in each frame, to detect if the circuit is losing bits (information), but this is not always used. An alarm signal may also be transmitted using timeslot TS0.
In 1875 Holmes obtained a British Patent for a marine audible alarm signal (B.P. 2564 of 1875); and in 1877 he bought, for £80 Pound Sterling, a half-share of John Grey's Patent (B.P. 2564 of 1868) for Improvements in fog alarms. In 1876 he obtained, with J.H. Player as co-applicant, a provisional application for Improvements in self-igniting and inextinguishable signal lights for marine and other purposes; it became British Patent 4215 of 1876.
They are characterized by a primitive Weberian apparatus formed by the first three vertebrae and one or more cephalic ribs within the head. This apparatus is believed to be a hearing organ, and is found in a more advanced and complex form in the related cypriniform fish, such as carp. Also like the cypriniforms, the gonorynchiforms produce a substance from their skin when injured that dissolves into the water and acts an alarm signal to other fish.
Of the two record breakers, the first (the commander of the Submarine Escape Training Tower at HMS Dolphin) was a regular ascent under control. The second, a petty officer instructor from the Submarine Escape Training Tower suffered an emergency release having given the alarm signal whilst flooding up the chamber. It was considered safer and quicker to escape him rather than depressurise and drain down. Both escapees suffered no lasting effects and returned to normal service.
At that time Telyatnikov was the chief of military fire prevention at the Chernobyl nuclear-power station. Telyatnikov and his subordinates ascended the badly damaged and heavily radiation contaminated roof of Reactor Unit 4 more than once in order to prevent the fires from spreading and endangering Reactor Unit 3. Another source gives a slightly different account: > Major Leonid Telyatnikov, the commander of Fire Station No. 2, was on > holiday, but he lived in Prypiat and had received the alarm signal by > telephone.
This pattern, which is also used for smoke alarms, is named the Temporal-Three alarm signal, often referred to as "T-3" or "Code-3" (ISO 8201 and ANSI/ASA S3.41 Temporal Pattern) and produces an interrupted four count (three half second pulses, followed by a one and one half second pause, repeated for a minimum of 180 seconds). CO (carbon monoxide) detectors are specified to use a similar pattern using four pulses of tone (often referred to as T4).
The great tit, a European songbird, uses such a signal to call on nearby birds to harass a perched bird of prey, such as an owl. This call occurs in the 4.5kHz range, and carries over long distances. However, when prey species are in flight, they employ an alarm signal in the 7–8 kHz range. This call is less effective at traveling great distances, but is much more difficult for both owls and hawks to hear (and detect the direction from which the call came).
The 31T is still in production today for general signaling purposes. (The red 31T 115 does fit all the requirements for a Fire Alarm signal however, and can be placed on a strobe plate without issue.) Cooper Wheelock also produces several bells as well as speakers, synchronization modules, chimes and voice evacuation products. Cooper Wheelock does not manufacture fire alarm control panels, smoke detectors, heat detectors, or pull stations. Many fire alarm control panels are compatible with Cooper Wheelock's line of notification appliances and other products.
The British immediately began transmitting their alarm signal, "QQQQ...QQQQ...Unidentified merchantman has ordered me to stop", and the Germans began transmitting so as to jam the signals. Scientist turned to flee, but on the second salvo from Atlantis flames exploded from the ship, followed by a cloud of dust and then white steam from the boilers. A British sailor was killed and the remaining 77 were taken as prisoners of war. After failing to sink the ship with demolition charges, Atlantis used guns and a torpedo to finish off Scientist.
When tending their young, Western grebe parents use different types of vocalization to communicate. Ticking is one of the two and is used as an alarm signal. Parents carry their newly hatched young on their backs, and when the parents make a ticking sound, this is used as a signal for their chicks to hide their heads beneath the back of their parents and be silent. If chicks are greater than 4 weeks of age, they respond to the ticking by swimming or diving away on their own.
In aggressive mimicry a predator has the appearance of a harmless organism or object attractive to the prey; when the prey approaches, the predator attacks. An animal defending against a predator may engage in either "fight or flight" or "tend and befriend" in response to predator attack or threat of attack, depending on its estimate of the predator's strength relative to its own. Alternative defenses include a range of antipredator adaptations, including alarm signals. An example of an alarm signal is nerol, a chemical which is found in the mandibular glands of Trigona fulviventris individuals.
Air traffic controllers watching Flight 778's progress noticed that the plane was proceeding down the runway at high speed and was not slowing down. An alarm signal was issued at 22:45. The flight operation director then ordered the controller in the airport control tower to send out the initial report of the accident, and ordered the weather observer at the main observation point to compile an observation of the weather. At 22:46, the airport was closed by the Aerodrome Flight Operation Director for further takeoffs and landings.
The Natalia Project is an alarm system for human rights defenders at risk that helps to ensure the survival of human rights defenders. It was launched in 2013, and is named after Natalia Estemirova, a Russian human rights activist and recipient of the Right Livelihood Award who was abducted and murdered in 2009 while working to document cases of human rights abuses in Chechnya. The device uses cellphone and satellite navigation technology to transmit an alarm signal that its bearer is in acute danger. Triggering the alarm transmits data about the bearer's location and personal details to enable a local and global response.
Oldham EX2000 portable explosimeter An explosimeter is a gas detector which is used to measure the amount of combustible gases present in a sample. When a percentage of the lower explosive limit (LEL) of an atmosphere is exceeded, an alarm signal on the instrument is activated. The device, also called a combustible gas detector, operates on the principle of resistance proportional to heat—a wire is heated, and a sample of the gas is introduced to the hot wire. Combustible gases burn in the presence of the hot wire, thus increasing the resistance and disturbing a Wheatstone bridge, which gives the reading.
The election was narrowly won by the Thermidorians, a faction which managed to win both the directorial and parliamentary majority. The election served as an alarm signal for the Republican political forces, as the monarchists, in a landslide, obtained 87 out of 161 elected seats inside the Legislative Body, as well a sympathizer Director: General Lazare Carnot, formerly a Jacobin and revolutionary chief. The threat of a return to monarchy, and possibly to the Ancien Régime, finally led to the republican Coup of 18 Fructidor in 1797, which expelled the monarchist opposition from the Legislative Body and banned the royalist circles.
The most convincing research to date indicates alarm substance cells serve as an immune system response and the ecological ramifications of this substance as a chemical alarm signal developed subsequently. This finding generates a number of interesting research questions. First, as mentioned earlier, males in many ostariophysan species cease production of alarm substance cells during the breeding season, presumably so females are not inadvertently repelled from the nest when males incur mechanical damage during nest building. In light of the immune hypothesis, alarm substance cells possibly are instead produced less during the breeding season because increased testosterone levels may decrease immune responses.
The weather signals continued to escalate after that. The rain started falling and at 11:15 pm the Observatory was ordered to fire an urgent alarm of three explosive rockets at 10-second intervals, and the night alarm signal on the Tamar changed to Red- Green-Red signalling the risk of hurricane-force winds expected at any moment to strike Hong Kong, equivalent to the hurricane signal number 10 in modern- day Hong Kong SAR. The typhoon reached its peak strength after midnight. The typhoon blew over trees, felled chimneys, cracked walls, and caused substantial damage to property.
As the weld warms the immediate vicinity inside the weld purge space, any materials exposed to the increasing temperature will start to outgas (give off gas). Normally this extra gas should be removed by the continuing weld purge gas flow, however there are times when gas and vapours overwhelm the purge, oxygen levels rise and the weld becomes contaminated. This should be spotted by the welder with his weld purging instrument. Some oxygen sensing instruments have the ability to give an alarm signal or close down the welding operation, when there is an unwanted rise in oxygen level.
Dmitry Medvedev and his wife at the festivities in the Naval cathedral. The cathedral operated as such for only 16 years. It was closed 14 October 1929 by the communist regime and its valuables were nationalized to the state treasury. A small portion of these relics were displayed at the Museum of Navy and the Russian Museum. In 1930—1931 the communist authorities had the cathedral defaced: its crosses and bells were toppled over and hauled to the foundries. One bell, weighing 4,726 kilograms (second largest) remained in place — either due to technical difficulties or deliberately, as an emergency alarm signal.
In the channel catfish, while a communication signal is directed toward the receiver and contains a specific message, an information signal is a part of the general existence of the individual or the group. For example, release of an alarm signal will communicate danger, but the individual's recognition odor is only an information signal identifying one fish from another. With regards to the function and contents of the club cells, the club cells may serve different functions throughout the fish's lifecycle. Variation in the contents of the club cells’ information signals therefore may change with the species’ needs at different stages of life.
Flocks of birds often exhibit collective detection. One or more birds initially detect the threat, and other birds that did not perceive the threat detect their departure and also respond by fleeing. The departure of multiple birds simultaneously is likely to be a more effective alarm signal than that of a single bird as birds regularly depart flocks for reasons other than predator detection. Water skaters (Halobates robustus) transmit predator avoidance behaviour through the group through the sense of touch: individuals at the edge of the flotilla detect a predator and move, bumping into their neighbours, who in turn start moving and bumping into more individuals.
There are a total of four signals sounded by the sirens, they are: Alarm signal: Wailing blasts that warn people of a danger or threat and it means for them to move a SCDF air raid shelter. Used only once on the island's Total Defence Day in 2006. (Sounds similar to the 'Attack' signal in the US) All clear signal: Continuous blasts of a clear sound to allow the people to move out of the shelter if the threat is over. (Sounds similar to the US' Alert signal) Important Message signal: Pulsating blasts sounded to alert the people of important messages broadcast by Singapore FM radio stations.
An alarm monitoring center or central monitoring station (also known as "CMS" or wholesale central station) is a company that provides services to monitor burglar, fire and residential alarm systems. The Central Monitoring Station may also provide watchman and supervisory services. "It functions as a support system for critical event management devices, such as: security alarm panels, gas and temperature gauges, PERS devices, crash detection devices, integrated video systems, and even mobile applications." Central monitoring stations use special telephone and mobile lines, radio channels, computers, software and trained staff to monitor their customers' security systems and call the appropriate authorities in the event an alarm signal is received.
BS 5839 Part 1 does not cover systems whose primary function is to control or extinguish fire (such as sprinklers or automatic extinguishing systems), but does cover the secondary alarm signal generated by such systems. It also does not cover voice alarm systems (which are separately addressed in BS 5839-8), or systems that integrate fire alarm functions with non fire related functions. It also does not cover manually or mechanically operated notification devices, such as hand-cranked bells. The NHS Estates publications HTM 05-03 Part B (in England and Wales) or SHTM 82(in Scotland) provide recommendations for fire detection and fire alarm systems in hospitals.
Although all home detectors use an audible alarm signal as the primary indicator, some versions also offer a digital readout of the CO concentration, in parts per million. Typically, they can display both the current reading and a peak reading from memory of the highest level measured over a period of time. These advanced models cost somewhat more but are otherwise similar to the basic models. The digital models offer the advantage of being able to observe levels that are below the alarm threshold, learn about levels that may have occurred during an absence, and assess the degree of hazard if the alarm sounds.
The word "conventional" is slang used to distinguish the method used to communicate with the control unit in newer addressable systems. So called "conventional detectors" are smoke detectors used in older interconnected systems and resemble electrical switches by their way of working. These detectors are connected in parallel to the signaling path so that the current flow is monitored to indicate a closure of the circuit path by any connected detector when smoke or other similar environmental stimulus sufficiently influences any detector. The resulting increase in current flow (or a dead short) is interpreted and processed by the control unit as a confirmation of the presence of smoke and a fire alarm signal is generated.
Because fMet is present in proteins made by bacteria but not in those made by eukaryotes (other than in bacterially derived organelles), the immune system might use it to help distinguish self from non-self. Polymorphonuclear cells can bind proteins starting with fMet, and use them to initiate the attraction of circulating blood leukocytes and then stimulate microbicidal activities such as phagocytosis. Since fMet is present in proteins made by mitochondria and chloroplasts, more recent theories do not see it as a molecule that the immune system can use to distinguish self from non-self. Instead, fMet-containing oligopeptides and proteins appear to be released by the mitochondria of damaged tissues as well as by damaged bacteria, and can thus qualify as an "alarm" signal, as discussed in the Danger model of immunity.
The Obelisk of Theodosius, detail of the pedestal: Theodosius I offers laurels of victory; we can see the water organ of Ctesibius, in the lower right-hand corner. The ancient Greek philosopher Plato (428–348 BC) was said to possess a large water clock with an unspecified alarm signal similar to the sound of a water organ; he used it at night, possibly for signaling the beginning of his lectures at dawn (Athenaeus 4.174c).; The Hellenistic engineer and inventor Ctesibius (fl. 285–222 BC) fitted his clepsydras with dial and pointer for indicating the time, and added elaborate "alarm systems, which could be made to drop pebbles on a gong, or blow trumpets (by forcing bell-jars down into water and taking the compressed air through a beating reed) at pre-set times" (Vitruv 11.11).
It can do this in a number of different ways, via the GPRS radio path, via the GSM radio path or via the telephone line/or IP if that has been chosen. These multiple signalling paths are all present and live at the same time backing each other up to minimise exposure of the property to intruders. Should one fail there is always one form of back up and depending on the manufacturer chosen up to three paths working simultaneously at any one time. Prior to the availability of dual signalling systems, police and keyholders were often called out to the premises because of an alarm signal on the telephone path only to discover that it was a network fault and not a genuine alarm Dual paths allow distinction between hardware failures and a genuine attack on the alarm.
The specifications for the design of ELTs are published by the RTCA, and in the specification the alarm signal is defined as an AM signal (A3X and/or N0N emissions), containing a swept tone ranging from 1600 Hz to 300 Hz (downwards), with 2-4 sweeps per second. When activated, 406 MHz units transmit a 0.5 second, 5-watt digital burst every 50 seconds, varying within a span of ±2.5 seconds somewhat randomly, so as to avoid multiple ELTs always having their beacons synchronized. As per 14 CFR 91.207.a.1, ELTs built according to TSO-C91 (of the type described below as "Traditional ELT, unregistered") have not been permitted for new installations since June 21, 1995; the replacing standard was TSO-C91a. Furthermore, TSO-C91/91a ELTs are being replaced / supplemented by the TSO C126 406 MHz ELT, a far superior unit.
Samurai were trained to watch for this feature to assist in determining how formidable an enemy would be in hand-to- hand combat. Sakurazawa Nyoichi used this diagnosis in his teachings and Ohsawa adapted it as a more general diagnostic indication of one's general state of health. The assassination of President Kennedy led Tom Wolfe to write:Tom Wolfe (12 January 1964) New York Herald Tribune Sunday MagazineWilliam Dufty (1965) Introduction to You Are All Sanpaku, page 10 > Abdul Karim Kassem, Ngo Dinh Diem, and President Kennedy, all sanpaku and, > now, shot to death, all destroyed by the fate of the sanpaku, which is more > than coincidence and should be an alarm signal to men and nations, say the > Macrobiotics, for thus it has been demonstrated by their leader, George > Ohsawa, Japanese prophet of the Unique Principle. This article caught the attention of William Dufty, who, finding relief in the brown rice diet recommended by Ohsawa, became an advocate of macrobiotics, and traveled to Paris to meet with Ohsawa and publisher Felix Morrow.
Buyun building main gate The term "tulou" first appeared in a 1573 Zhangzhou county record of the Ming dynasty; it was on record that due to the growth of bandits, many villagers built walled strongholds and tulous as a means of self defense. Many families banded together in a stronghold, and several strongholds or tulous joined hand in hand with sentinels constantly on guard and lookout; loud drums and gongs were sounded as an alarm signal for any sign of approaching bandits or invaders. Due to the massive solidarity of tulou residents, even large powerful bandit gangs with tens of thousands of men dared not attack the inhabitants of tulou. The term "tulou" also came out occasionally in some poems; other than that, the existence of tulou bypassed mainstream literature, and was not mentioned in literature published before 1956 dedicated to the study of the people's environment. In 1956 professor Liu Dun-zhen (), Head of Chinese Dwelling Research was the first scholar to carry out research on Fujian Tulou, his book History of Ancient Chinese Architecture 《中国古代建筑史》published in 1964 described Chengqi Lou and Yihuai Lou ().

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