1.
Newcastle, New South Wales
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Located 162 kilometres north-northeast of Sydney, at the mouth of the Hunter River, it is the predominant city within the Hunter Region. Famous for its coal, Newcastle is the largest coal exporting harbour in the world, beyond the city, the Hunter Region possesses large coal deposits. Geologically, the area is located in the part of the Sydney basin. Newcastle and the lower Hunter Region were traditionally occupied by the Awabakal and Worimi Aboriginal People, in September 1797 Lieutenant John Shortland became the first European settler to explore the area. His discovery of the area was largely accidental, as he had sent in search of a number of convicts who had seized HMS Cumberland as she was sailing from Sydney Cove. While returning, Lt. Shortland entered what he described as a very fine river. He returned with reports of the port and the areas abundant coal. Over the next two years, coal mined from the area was the New South Wales colonys first export, Newcastle gained a reputation as a hellhole as it was a place where the most dangerous convicts were sent to dig in the coal mines as harsh punishment for their crimes. By the start of the 19th century the mouth of the Hunter River was being visited by groups of men, including coal diggers, timber-cutters. Philip Gidley King, the Governor of New South Wales from 1800, in 1801, a convict camp called Kings Town was established to mine coal and cut timber. In the same year, the first shipment of coal was dispatched to Sydney and this settlement closed less than a year later. A settlement was attempted in 1804, as a place of secondary punishment for unruly convicts. The settlement was named Coal River, also Kingstown and then renamed Newcastle, the new settlement, comprising convicts and a military guard, arrived at the Hunter River on 27 March 1804 in three ships, HMS Lady Nelson, the Resource and the James. The convicts were rebels from the 1804 Castle Hill convict rebellion, Morpeth, New South Wales is a similar distance north of Newcastle as Morpeth, Northumberland is north of Newcastle upon Tyne. Under Captain James Wallis, commandant from 1815 to 1818, the conditions improved. The quality of these first buildings was poor, and only breakwater survives, during this period, in 1816, the oldest public school in Australia was built in East Newcastle. Newcastle remained a settlement until 1822, when the settlement was opened up to farming. As a penal colony, the rule was harsh, especially at Limeburners Bay
2.
Maitland, New South Wales
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It is on the New England Highway about 17 km from its start at Hexham. The city centre is located on the bank of the Hunter River. Surrounding areas include the cities of Cessnock and Singleton local government areas, originally Maitland was a culmination of three separate towns which arose roughly all around the same time. West Maitland, now just Maitland, was a privately founded town grew because of its proximity to the river. The other areas were East Maitland, which was established by the colonial New South Wales government, and Morpeth, another private town founded by Lieutenant Close, each town functioned as if they were separate municipalities. The name, Maitland, was reported in 1885 to have had its name taken from Sir George Maitland, under Secretary for the Colonies, and M. P. for the Borough of Whitchurch, in Hampshire, England. The present city was proclaimed in 1945 with the amalgamation of the three local government areas, the citys boundaries have been increased by incorporating parts of other local government areas since then. West Maitland was founded in 1820 close to the reach of the Hunter River where vessels with a shallow draft could navigate. Nearby Morpeth served as the head of navigation for larger ships, originally the route river route between Morpeth and West Maitland was 26 kilometres, today after various floods and river course changes this has reduced to just 9 kilometres. Maitland was therefore the point at which goods were unloaded for, and distributed to, accordingly, there were large warehouses built, which faced onto the main High Street and backed onto the Hunter River. For almost 20 years until the Victorian gold rush, Maitland was the second largest town in Australia, the arrival of the railway from Newcastle in the 1850s, coupled with the increasing silting of the river and larger ships spelt the end of the traditional river traffic. The first electricity connected in the area was to Maitland Town Hall in 1922, to the Halls front light. The first bridge to link West Maitland with what is now the suburb of Lorn was opened in 1869 and named in honour of the then Governor of New South Wales, the 4th Earl of Belmore. Although the bridge proved vital to the development, the floods of 1893,1913 and 1930 began to heighten the need for a new bridge that could withstand periodic flooding. A second Belmore Bridge, designed to withstand the impact of debris during floods, was adjacent to the 1869 bridge in 1964. The new bridge, which redirected traffic away from St. Andrews Street to a new intersection at the Maitland Court House, is one of the three main river crossings. Maitlands proximity to the Hunter River has resulted in a succession of floods since European settlement, over 200 floods have occurred on the Hunter River since settlement,13 of those higher than the rivers normal peak limit of 10.7 metres. Of these 13, all have had an effect on the city of Maitland
3.
Port Stephens Council
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Port Stephens Council is a local government area in the Hunter Region of New South Wales, Australia. The area is just north of Newcastle and is adjacent to the Pacific Highway which runs through Raymond Terrace, the area is named after Port Stephens, which is the major geographical feature of the area. It extends generally from the Hunter River in the south, to near Clarence Town in the north, the Mayor of the Port Stephens Council is Bruce MacKenzie. In the southern part of the area are the communities of Bobs Farm, Fern Bay, Fullerton Cove, Salt Ash, Tomago. Tomago supports both rural and industrial communities while Williamtown is the location for a Royal Australian Air Force base that shares its airfield with Newcastle Airport, at the northern end of the area are Karuah and Twelve Mile Creek. Located adjacent to Port Stephens and straddling the Karuah River, Karuah is predominantly residential and it is the location of the largest Aboriginal community in the area. Twelve Mile Creek is almost exclusively rural, centrally located in the area, between Raymond Terrace and Port Stephens are Campvale, Ferodale and Medowie. Ferodale is dominated by Grahamstown Dam, a dam with a capacity of 131,800 megalitres that is a major source of fresh water in the region. The remainder of area is a mix of rural, semi-rural and residential developments. A map of the towns, suburbs and localities within the Port Stephens Council area is available from the Port Stephens Council website. At the 2011 census, there were 64,807 people in the Port Stephens local government area, Aboriginal and Torres Strait Islander people made up 3.6 per cent of the population, which was higher than the national and state averages of 2.5 per cent. The median age of people in the Port Stephens Council area was 42 years, children aged 0 –14 years made up 19.5 per cent of the population and people aged 65 years and over made up 19.3 per cent of the population. Of people in the area aged 15 years and over,52.0 per cent were married and 13.5 per cent were either divorced or separated, the median weekly income for residents within the Port Stephens Council area was significantly lower than the national average. At the 2011 census, the proportion of residents in the Port Stephens local government area who stated their ancestry as Australian or Anglo-Saxon exceeded 81 per cent of all residents. Port Stephens Council is composed of ten Councillors, including the Mayor, for a fixed term of office. The Mayor is directly elected while the nine other Councillors are elected proportionally as three separate wards, each electing three Councillors, in the initial proposal, Port Stephens Council was not included in any amalgamation proposals. The proposed merger has been met with significant opposition, thousands of residents have attended rallies and signed petitions opposed to the proposal, while 470 have attended public inquiry meetings. The state member for Port Stephens, Kate Washington, former state member Craig Baumann, federal Liberal member for Paterson, Bob Baldwin, spoke in parliament, urging the Liberal Baird government to reconsider the proposal, claiming this proposal seems to defy logic
4.
Cessnock, New South Wales
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Cessnock is a city in the Hunter Region of New South Wales, Australia, about 52 km by road west of Newcastle. It is the centre of the City of Cessnock LGA and was named after an 1826 grant of land called Cessnock Estate. The local area was known as The Coalfields, and it is the gateway city to the vineyards of the Hunter Valley, which includes Pokolbin, Mount View, Lovedale, Broke, Rothbury. The estimated urban population of Cessnock was 22,596 at June 2015, having grown at an annual rate, year-on-year. The transition to wine service centre from a prosperous mining town has been a long. Cessnock lies between Australia’s earliest European settlements – Sydney, the Hawkesbury River and Newcastle, lying on the land route between these important settlements it provided early European contact with indigenous people who have inhabited the Cessnock area for more than 3,000 years. The Wonnarua people were the inhabitants at the time of European contact. Many were killed or died as a result of European diseases, others were forced onto neighbouring tribal territory and killed. The city of Cessnock abounds in place names and names with indigenous association which is indicative of this settlement and include Congewai, Kurri Kurri, Laguna, Nulkaba. Pastoralists commenced settling the land in the 1820s, Cessnock was named by Scottish settler John Campbell, after his grandfathers baronial Cessnock Castle in Galston, East Ayrshire, to reflect the aristocratic heritage and ambitions for this estate. The township of Cessnock developed from 1850, as a centre at the junction of the Great North Road from Sydney to the Hunter Valley, with branches to Maitland. The establishment of the South Maitland coalfields generated extensive land settlement between 1903 and 1923, the current pattern of urban development, transport routes and industrial landscape was laid at this time. The decline of mining on the South Maitland Coalfields has been paralleled by growth in the wine industry, the Hunter Valley wine-growing area near Cessnock is Australias oldest wine region and one of the most famous, with around 1,800 hectares under vine. The vineyards of Pokolbin, Mount View and Allandale, with their rich volcanic soils tended by entrepreneurial vignerons, are also the focus of a thriving and growing tourism industry, the extension and eventual completion of the F3 Freeway, created a property and tourism boom during the 1990s. Cessnock has begun to develop other tourist ventures beyond the industry such as championship golf courses, hot air ballooning, sky-diving. The city council has actively pursued a policy of urban renewal in the city centre since 2001, the local council was one of the first to introduce a recycling program for waste disposal in the state. The town is located in the alluvial and volcanic soils of the Hunter Valley. Rich coal seams underlie much of the area, the Brokenback Range rises to the west of the city
5.
Frequency
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Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as frequency, which emphasizes the contrast to spatial frequency. The period is the duration of time of one cycle in a repeating event, for example, if a newborn babys heart beats at a frequency of 120 times a minute, its period—the time interval between beats—is half a second. Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as vibrations, audio signals, radio waves. For cyclical processes, such as rotation, oscillations, or waves, in physics and engineering disciplines, such as optics, acoustics, and radio, frequency is usually denoted by a Latin letter f or by the Greek letter ν or ν. For a simple motion, the relation between the frequency and the period T is given by f =1 T. The SI unit of frequency is the hertz, named after the German physicist Heinrich Hertz, a previous name for this unit was cycles per second. The SI unit for period is the second, a traditional unit of measure used with rotating mechanical devices is revolutions per minute, abbreviated r/min or rpm. As a matter of convenience, longer and slower waves, such as ocean surface waves, short and fast waves, like audio and radio, are usually described by their frequency instead of period. Spatial frequency is analogous to temporal frequency, but the axis is replaced by one or more spatial displacement axes. Y = sin = sin d θ d x = k Wavenumber, in the case of more than one spatial dimension, wavenumber is a vector quantity. For periodic waves in nondispersive media, frequency has a relationship to the wavelength. Even in dispersive media, the frequency f of a wave is equal to the phase velocity v of the wave divided by the wavelength λ of the wave. In the special case of electromagnetic waves moving through a vacuum, then v = c, where c is the speed of light in a vacuum, and this expression becomes, f = c λ. When waves from a monochrome source travel from one medium to another, their remains the same—only their wavelength. For example, if 71 events occur within 15 seconds the frequency is, the latter method introduces a random error into the count of between zero and one count, so on average half a count. This is called gating error and causes an error in the calculated frequency of Δf = 1/, or a fractional error of Δf / f = 1/ where Tm is the timing interval. This error decreases with frequency, so it is a problem at low frequencies where the number of counts N is small, an older method of measuring the frequency of rotating or vibrating objects is to use a stroboscope
6.
Hertz
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The hertz is the unit of frequency in the International System of Units and is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide proof of the existence of electromagnetic waves. Hertz are commonly expressed in SI multiples kilohertz, megahertz, gigahertz, kilo means thousand, mega meaning million, giga meaning billion and tera for trillion. Some of the units most common uses are in the description of waves and musical tones, particularly those used in radio-. It is also used to describe the speeds at which computers, the hertz is equivalent to cycles per second, i. e. 1/second or s −1. In English, hertz is also used as the plural form, as an SI unit, Hz can be prefixed, commonly used multiples are kHz, MHz, GHz and THz. One hertz simply means one cycle per second,100 Hz means one hundred cycles per second, and so on. The unit may be applied to any periodic event—for example, a clock might be said to tick at 1 Hz, the rate of aperiodic or stochastic events occur is expressed in reciprocal second or inverse second in general or, the specific case of radioactive decay, becquerels. Whereas 1 Hz is 1 cycle per second,1 Bq is 1 aperiodic radionuclide event per second, the conversion between a frequency f measured in hertz and an angular velocity ω measured in radians per second is ω =2 π f and f = ω2 π. This SI unit is named after Heinrich Hertz, as with every International System of Units unit named for a person, the first letter of its symbol is upper case. Note that degree Celsius conforms to this rule because the d is lowercase. — Based on The International System of Units, the hertz is named after the German physicist Heinrich Hertz, who made important scientific contributions to the study of electromagnetism. The name was established by the International Electrotechnical Commission in 1930, the term cycles per second was largely replaced by hertz by the 1970s. One hobby magazine, Electronics Illustrated, declared their intention to stick with the traditional kc. Mc. etc. units, sound is a traveling longitudinal wave which is an oscillation of pressure. Humans perceive frequency of waves as pitch. Each musical note corresponds to a frequency which can be measured in hertz. An infants ear is able to perceive frequencies ranging from 20 Hz to 20,000 Hz, the range of ultrasound, infrasound and other physical vibrations such as molecular and atomic vibrations extends from a few femtoHz into the terahertz range and beyond. Electromagnetic radiation is described by its frequency—the number of oscillations of the perpendicular electric and magnetic fields per second—expressed in hertz. Radio frequency radiation is measured in kilohertz, megahertz, or gigahertz
7.
Amplitude modulation
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Amplitude modulation is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. In amplitude modulation, the amplitude of the wave is varied in proportion to the waveform being transmitted. That waveform may, for instance, correspond to the sounds to be reproduced by a loudspeaker and this technique contrasts with frequency modulation, in which the frequency of the carrier signal is varied, and phase modulation, in which its phase is varied. AM was the earliest modulation method used to transmit voice by radio and it was developed during the first two decades of the 20th century beginning with Roberto Landell De Moura and Reginald Fessendens radiotelephone experiments in 1900. It remains in use today in many forms of communication, for example it is used in two way radios, VHF aircraft radio, Citizens Band Radio, and in computer modems. AM is often used to refer to mediumwave AM radio broadcasting, when it reaches its destination, the information signal is extracted from the modulated carrier by demodulation. In amplitude modulation, the amplitude or strength of the oscillations is what is varied. For example, in AM radio communication, a continuous wave signal has its amplitude modulated by an audio waveform before transmission. The audio waveform modifies the amplitude of the wave and determines the envelope of the waveform. In the frequency domain, amplitude modulation produces a signal with power concentrated at the carrier frequency, each sideband is equal in bandwidth to that of the modulating signal, and is a mirror image of the other. Standard AM is thus sometimes called double-sideband amplitude modulation to distinguish it more sophisticated modulation methods also based on AM. One disadvantage of all amplitude modulation techniques is that the receiver amplifies and detects noise, increasing the received signal to noise ratio, say, by a factor of 10, thus would require increasing the transmitter power by a factor of 10. For this reason AM broadcast is not favored for music and high fidelity broadcasting, another disadvantage of AM is that it is inefficient in power usage, at least two-thirds of the power is concentrated in the carrier signal. The carrier signal contains none of the information being transmitted. However its presence provides a means of demodulation using envelope detection, providing a frequency. The receiver may regenerate a copy of the frequency from a greatly reduced pilot carrier to use in the demodulation process. Even with the carrier totally eliminated in double-sideband suppressed-carrier transmission, carrier regeneration is possible using a Costas phase-locked loop and this doesnt work however for single-sideband suppressed-carrier transmission, leading to the characteristic Donald Duck sound from such receivers when slightly detuned. Single sideband is used widely in amateur radio and other voice communications both due to its power efficiency and bandwidth efficiency
8.
Frequency modulation
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In telecommunications and signal processing, frequency modulation is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. This contrasts with amplitude modulation, in which the amplitude of the wave varies. This modulation technique is known as frequency-shift keying, FSK is widely used in modems and fax modems, and can also be used to send Morse code. Frequency modulation is used for FM radio broadcasting. For this reason, most music is broadcast over FM radio, frequency modulation has a close relationship with phase modulation, phase modulation is often used as an intermediate step to achieve frequency modulation. Mathematically both of these are considered a case of quadrature amplitude modulation. While most of the energy of the signal is contained within fc ± fΔ, the frequency spectrum of an actual FM signal has components extending infinitely, although their amplitude decreases and higher-order components are often neglected in practical design problems. Mathematically, a baseband modulated signal may be approximated by a continuous wave signal with a frequency fm. This method is also named as Single-tone Modulation. As in other systems, the modulation index indicates by how much the modulated variable varies around its unmodulated level. e. The maximum deviation of the frequency from the carrier frequency. For a sine wave modulation, the index is seen to be the ratio of the peak frequency deviation of the carrier wave to the frequency of the modulating sine wave. If h ≪1, the modulation is called narrowband FM, sometimes modulation index h<0.3 rad is considered as Narrowband FM otherwise Wideband FM. In the case of digital modulation, the carrier f c is never transmitted, rather, one of two frequencies is transmitted, either f c + Δ f or f c − Δ f, depending on the binary state 0 or 1 of the modulation signal. If h ≫1, the modulation is called wideband FM, if the frequency deviation is held constant and the modulation frequency increased, the spacing between spectra increases. The carrier and sideband amplitudes are illustrated for different modulation indices of FM signals, for particular values of the modulation index, the carrier amplitude becomes zero and all the signal power is in the sidebands. Since the sidebands are on sides of the carrier, their count is doubled, and then multiplied by the modulating frequency to find the bandwidth. For example,3 kHz deviation modulated by a 2.2 kHz audio tone produces an index of 1.36. Suppose that we limit ourselves to only those sidebands that have an amplitude of at least 0.01
