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  • Title: uam www.uam2009.gr
    Descriptive info: .. Αρχική.. UA.. Theory.. Measurements.. Applications UA.. Communications.. Επικοινωνία.. uam.. Information about uam.. After 4 successful international conferences and exhibitions on Underwater Acoustic Measurements: Technologies and Results held in 2005 and 2007 in Crete, in 2009 in Nafplion, and in 2011 in Kos, Greece, respectively, these conferences and their exhibitions have now received an international reputation for their high scientific and technological standard and for the famous Greek hospitality, which accompany them.. During the most recent European Conference on Underwater Acoustics (ECUA) held in Edinburgh, Scotland, it was decided to merge the ECUA conferences with the Underwater Acoustic Measurement: Technologies and Result (UAM) conferences to form a large conference covering all fields of underwater acoustics to be held every second year in Europe.. In the years when this large conference is not being held, symposia on hot topics in underwater acoustics can be arranged, according to need.. The successes of the UAM and the ECUA conferences oblige.. It has, therefore, been decided to organize the 5th international conference and exhibition on Underwater Acoustic Measurements: Technologies and Results merged with the 12th European Conference on Underwater Acoustics on the Greek island of Corfu during the days Sunday 23rd through Friday 28th June, 2013.. The conference venue will be: Corfu Imperial Grecotel Exclusive Resort.. http://www.. corfuimperial.. com.. Corfu Imperial Grecotel Exclusive Resort.. Contributions from all areas of underwater acoustics will be included in the ECUA merged with the UAM conference.. The conference will comprise plenary sessions with invited keynote lectures.. A prominent series of structured oral sessions with invited papers given by leading international scientists will  ...   control of underwater processes will be arranged in the central area of the conference space.. Up-to-date information on this conference, will currently be published on this website.. Source:.. uam-conferences.. org.. Επιλογές.. Links.. Transport companies.. SEO.. Χρήσιμοι σύνδεσμοι.. Uam conferences.. and after 4 successful international conferences and exhibitions on Underwater Acoustic Measurements: Technologies and Results held in 2005 and 2007 in Crete, in 2009 in Nafplion, and in 2011 in Kos, Greece, respectively, these conferences and their exhibitions have now received an international reputation for their high scientific and technological standard and for the famous Greek hospitality, which accompany them.. Φωτοβολταϊκά σε ταράτσες.. είναι αυτά που εξυπηρετούν δύο σκοπούς, γι αυτό υπάρχουν δύο κατηγορίες φωτοβολταικών συστημάτων σε ταράτσες ή σε στέγεςς, αυτά που είναι αυτόνομα και αυτά που διασυνδέονται με το δίκτυο της Δ.. Ε.. Η.. Τα φωτοβολταϊκά σε ταράτσες είναι έξυπνος τρόπος εξοικονόμισης ενέργειας.. φίλτρα νερού.. τα οποία μετά από πολλές έρευνες έχει διαπιστωθεί ότι κάνοντας καθημερινή κατανάλωση φιλτραρισμένου πόσιμου νερού ευεργετείται ο ανθρώπινος οργανισμός και φυσικά η ποιότητα του θα πρέπει να είναι άριστη, γι αυτό τα φίλτρα νερού είναι απαραίτητα.. Σχετικά με τα φίλτρα νερού μπορείται να ενημερώνεστε από το διαδίκτυο.. DealmyDay.. για παιδικές παραστάσεις και για μεγάλους, DealmyDay για χαμηλές τιμές, DealmyDay για να φτιάξεις τη μέρα σου οικονομικά και ποιοτικά, το DealmyDay συνεχίζει τις μεγάλες προσφορές και εκπτώσεις.. DealmyDay και η διασκέδαση είναι εγγυημένη.. Μεταφορές Θεσσσαλονίκης.. και οποιεσδήποτε άλλες μεταφορές.. Εκτός από τις μεταφορές της Θεσσσαλονίκης θα συναντήσετε πολλές και όλες μαζεμένες και τακτοποιημένες, εσείς καταχωρήστε την μεταφορά και περιμένετε για τις προσφορές.. Μεταφορές Θεσσσαλονίκης και μεταφέρετε εύκολα ότι θέλετε.. 2012..

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  • Title: UA.html www.uam2009.gr
    Descriptive info: Underwater acoustics is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water and its boundaries.. The water may be in the ocean, a lake or a tank.. Typical frequencies associated with underwater acoustics are between 10 Hz and 1 MHz.. The propagation of sound in the ocean at frequencies lower than 10 Hz is usually not possible without penetrating deep into the seabed, whereas frequencies above 1 MHz are rarely used because they are absorbed very quickly.. Underwater acoustics is sometimes known as hydroacoustics.. The field of underwater acoustics is closely related to a number of other fields of acoustic study, including sonar, transduction, acoustic signal processing, acoustical oceanography, bioacoustics, and physical acoustics.. History.. Underwater sound has probably been used by marine animals for millions of years.. The science of underwater acoustics began in 1490, when Leonardo Da Vinci wrote,.. If you cause your ship to stop and place the head of a long tube in the water and place the outer extremity to your ear, you will hear ships at a great distance from you.. In 1687 Isaac Newton wrote his Mathematical Principles of Natural Philosophy which included the first mathematical treatment of sound.. The next major step in the development of underwater acoustics was made by Daniel Colladon, a Swiss physicist, and Charles Sturm, a French mathematician.. In 1826, on Lake Geneva, they measured the elapsed time between a flash of light and the sound of a submerged ship's bell heard using an  ...   B Wood and associates.. The development of both active ASDIC and passive sonar (SOund Navigation And Ranging) proceeded apace during the war, driven by the first large scale deployments of submarines.. Other advances in underwater acoustics included the development of acoustic mines.. In 1919, the first scientific paper on underwater acoustics was published, theoretically describing the refraction of sound waves produced by temperature and salinity gradients in the ocean.. The range predictions of the paper were experimentally validated by transmission loss measurements.. The next two decades saw the development of several applications of underwater acoustics.. The fathometer, or depth sounder, was developed commercially during the 1920s.. Originally natural materials were used for the transducers, but by the 1930s sonar systems incorporating piezoelectric transducers made from synthetic materials were being used for passive listening systems and for active echo-ranging systems.. These systems were used to good effect during World War II by both submarines and anti-submarine vessels.. Many advances in underwater acoustics were made which were summarised later in the series Physics of Sound in the Sea, published in 1946.. After World War II, the development of sonar systems was driven largely by the Cold War, resulting in advances in the theoretical and practical understanding of underwater acoustics, aided by computer-based techniques.. Sound waves in water.. A sound wave propagating underwater consists of alternating compressions and rarefactions of the water.. These compressions and rarefactions are detected by a receiver, such as the human ear or a hydrophone, as changes in pressure.. These waves may be man-made or naturally generated.. wikipedia..

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  • Title: Theory.html www.uam2009.gr
    Descriptive info: Speed of sound, density and impedance.. The speed of sound c \, (i.. e.. , the longitudinal motion of wavefronts) is related to frequency f \, and wavelength \lambda \, of a wave by c = f \cdot \lambda.. This is different from the particle velocity u \,, which refers to the motion of molecules in the medium due to the sound, and relates the plane wave the pressure p \, to the fluid density \rho \, and sound speed c \, by p = c \cdot u \cdot \rho.. The product of c and \rho \, from the above formula is known as the characteristic acoustic impedance.. The acoustic power (energy per second) crossing unit area is known as the intensity of the wave and for a plane wave the average intensity is given by I = q^2/(\rho c) \,, where q \, is the root mean square acoustic pressure.. At 1 kHz, the wavelength in water is about 1.. 5 m.. Sometimes the term sound velocity is used but this is incorrect as the quantity is a scalar.. The large impedance contrast between air and water (the ratio is about 3600) and the scale of surface roughness means that the sea surface behaves as an almost perfect reflector of sound at frequencies below 1 kHz.. Sound speed in water exceeds that in air by a factor of 4.. 4 and the density ratio is about 820.. Absorption of sound.. Absorption of low frequency sound is weak.. [6] (see Technical Guides - Calculation of absorption of sound in seawater for an on-line calculator).. The main cause of sound attenuation in fresh water, and at high frequency in sea water (above 100 kHz) is viscosity.. Important additional contributions at lower frequency in seawater are associated with the ionic relaxation of boric acid (up to c.. 10 kHz)[6] and magnesium sulfate (c.. 10 kHz-500 kHz).. [7].. Sound may be absorbed by losses at the fluid boundaries.. Near the surface of the sea losses can occur in a bubble layer or in ice, while at the bottom sound can penetrate into the sediment and be absorbed.. Sound Reflection and Scattering.. Boundary interactions.. Both the water surface and bottom are reflecting and scattering boundaries.. Surface.. For many purposes the sea-air surface can be thought of as a perfect reflector.. The impedance contrast is so great that little energy is able to cross this boundary.. Acoustic pressure waves reflected from the sea surface experience a reversal in phase, often stated as either a pi phase change or a 180 deg phase change.. This is represented mathematically by assigning a reflection coefficient of minus 1 instead of plus one to the sea surface.. At high frequency (above about 1 kHz) or when the sea is rough, some of the incident sound is scattered, and this is taken into account by assigning a reflection coefficient whose magnitude is less than one.. For example, close to normal incidence, the reflection coefficient becomes R=-e^{-2 k^{2} h^{2} sin^2A}, where h is the rms wave height.. [8].. A further complication is the presence of wind generated bubbles or fish close to the sea surface.. [9] The bubbles can also form plumes that absorb some of the incident and scattered sound, and scatter some of the sound themselves.. [10].. Seabed.. The acoustic impedance mismatch between water and the bottom is generally much less than at the surface and is more complex.. It depends on the bottom material types and depth of the layers.. Theories have been developed for predicting the sound propagation in the bottom in this case, for example by Biot [11] and by Buckingham.. [12].. At Target.. The reflection of sound at a target whose dimensions are large compared with the acoustic wavelength depends on its size and shape as well as the impedance of the target relative to that of water.. Formulae have been developed for the target strength of various simple shapes as a function of angle of sound incidence.. More complex shapes may be approximated by combining these simple ones.. [1].. Propagation of sound.. Underwater acoustic propagation depends on many factors.. The direction of sound propagation is determined by the sound speed gradients in  ...   I_r is not the true acoustic intensity at the receiver, which is a vector quantity, but a scalar equal to the equivalent plane wave intensity (EPWI) of the sound field.. The EPWI is defined as the magnitude of the intensity of a plane wave of the same RMS pressure as the true acoustic field.. At short range the propagation loss is dominated by spreading while at long range it is dominated by absorption and/or scattering losses.. An alternative definition is possible in terms of pressure instead of intensity,[13] giving PL=20 log (p_s/p_r), where p_s is the RMS acoustic pressure in the far-field of the projector, scaled to a standard distance of 1 m, and p_r is the RMS pressure at the receiver position.. These two definitions are not exactly equivalent because the characteristic impedance at the receiver may be different from that at the source.. Because of this, the use of the intensity definition leads to a different sonar equation to the definition based on a pressure ratio.. [14] If the source and receiver are both in water, the difference is small.. Propagation modeling.. The propagation of sound through water is described by the wave equation, with appropriate boundary conditions.. A number of models have been developed to simplify propagation calculations.. These models include ray theory, normal mode solutions, and parabolic equation simplifications of the wave equation.. [15] Each set of solutions is generally valid and computationally efficient in a limited frequency and range regime, and may involve other limits as well.. Ray theory is more appropriate at short range and high frequency, while the other solutions function better at long range and low frequency.. [16] Various empirical and analytical formulae have also been derived from measurements that are useful approximations.. [17].. Reverberation.. Transient sounds result in a decaying background that can be of much larger duration than the original transient signal.. The cause of this background, known as reverberation, is partly due to scattering from rough boundaries and partly due to scattering from fish and other biota.. For an acoustic signal to be detected easily, it must exceed the reverberation level as well as the background noise level.. Doppler Shift.. If an underwater object is moving relative to an underwater receiver, the frequency of the received sound is different from that of the sound radiated (or reflected) by the object.. This change in frequency is known as a Doppler shift.. The shift can be observed in active sonar systems, particularly narrowband ones, because the transmitter frequency is known, and the relative motion between sonar and object can be calculated.. Sometimes the frequency of the radiated noise (a tonal) may also be known, in which case the same calculation can be done for passive sonar.. For active systems the change in frequency is 0.. 69 Hz per knot per kHz and half this for passive systems as propagation is only one way.. The shift corresponds to an increase in frequency for an approaching target.. Intensity Fluctuations.. Though acoustic propagation modelling generally predicts a constant received sound level, in practice there are both temporal and spatial fluctuations.. These may be due to both small and large scale environmental phenomena.. These can include sound speed profile fine structure and frontal zones as well as internal waves.. Because in general there are multiple propagation paths between a source and receiver, small phase changes in the interference pattern between these paths can lead to large fluctuations in sound intensity.. Non-linearity.. In water, especially with air bubbles, the change in density due to a change in pressure is not exactly linearly proportional.. As a consequence for a sinusoidal wave input additional harmonic and subharmonic frequencies are generated.. When two sinusoids are input sum and difference frequencies are generated.. The conversion process is greater at high source levels than small ones.. Because of the non-linearity there is a dependence of sound speed on the pressure amplitude so that large changes travel faster than small ones.. Thus a sinusoidal waveform gradually becomes a sawtooth one with a steep rise and a gradual tail.. Use is made of this phenomenon in parametric sonar and theories have been developed to account for this, e.. g.. by Westerfield..

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  • Title: Measurements.html www.uam2009.gr
    Descriptive info: Sound in water is measured using a hydrophone, which is the underwater equivalent of a microphone.. A hydrophone measures pressure fluctuations, and these are usually converted to sound pressure level (SPL), which is a logarithmic measure of the mean square acoustic pressure.. Measurements are usually reported in one of three forms :-.. RMS acoustic pressure in micropascals (or dB re 1 μPa).. RMS acoustic pressure in a specified bandwidth, usually octaves or thirds of octave (dB re 1 μPa).. spectral density (mean square pressure per unit bandwidth) in micropascals per hertz (dB re 1 μPa²/Hz).. Sound speed.. Approximate values for fresh water and seawater, respectively, at atmospheric pressure are 1450 and 1500 m/s for the sound speed, and 1000 and 1030 kg/m³ for the density.. The speed of sound in water increases with increasing pressure, temperature and salinity.. The maximum speed in pure water under atmospheric pressure is attained at about 74°C; sound travels slower in hotter water after that point; the maximum increases with pressure.. On-line calculators can be found at Technical Guides - Speed of Sound in Sea-Water and Technical Guides - Speed of Sound in Pure Water.. Absorption.. Many measurements have been made of sound absorption in lakes and the ocean (see Technical Guides - Calculation of absorption of sound in seawater for an on-line calculator).. Ambient noise.. Measurement of acoustic signals are possible if their amplitude exceeds a minimum threshold, determined partly by the signal processing used and partly by the level of background noise.. Ambient noise is that part of the received noise that is independent of the source, receiver and platform characteristics.. This it excludes reverberation and towing noise for example.. The background noise present in the ocean, or ambient noise, has many different sources and varies with location and frequency.. At the lowest frequencies, from about 0.. 1 Hz to 10 Hz, ocean turbulence and microseisms are the primary contributors to the noise background.. Typical noise spectrum levels decrease with increasing frequency from about 140 dB re 1 μPa²/Hz at 1 Hz to about 30 dB re 1 μPa²/Hz at 100 kHz.. Distant ship traffic is one of the dominant noise sources in most areas for frequencies of around 100 Hz, while wind-induced surface noise is the main source between 1 kHz and 30 kHz.. At very high frequencies, above 100 kHz, thermal noise of water molecules begins to dominate.. The thermal noise spectral level at 100 kHz is 25 dB re 1 μPa²/Hz.. The spectral density of thermal noise increases by 20 dB per decade (approximately 6 dB per octave).. Transient  ...   The loss depends on the sound speed in the bottom (which is affected by gradients and layering) and by roughness.. Graphs have been produced for the loss to be expected in particular circumstances.. In shallow water bottom loss often has the dominant impact on long range propagation.. At low frequencies sound can propagate through the sediment then back into the water.. Underwater hearing.. Comparison with airborne sound levels.. As with airborne sound, sound pressure level underwater is usually reported in units of decibels, but there are some important differences that make it difficult (and often inappropriate) to compare SPL in water with SPL in air.. These differences include:.. difference in reference pressure: 1 μPa (one micropascal, or one millionth of a pascal) instead of 20 μPa.. difference in interpretation: there are two schools of thought, one maintaining that pressures should be compared directly, and that the other that one should first convert to the intensity of an equivalent plane wave.. difference in hearing sensitivity: any comparison with (A-weighted) sound in air needs to take into account the differences in hearing sensitivity, either of a human diver or other animal.. Hearing sensitivity.. The lowest audible SPL for a human diver with normal hearing is about 67 dB re 1 μPa, with greatest sensitivity occurring at frequencies around 1 kHz.. Dolphins and other toothed whales are renowned for their acute hearing sensitivity, especially in the frequency range 5 to 50 kHz.. Several species have hearing thresholds between 30 and 50 dB re 1 μPa in this frequency range.. For example the hearing threshold of the killer whale occurs at an RMS acoustic pressure of 0.. 02 mPa (and frequency 15 kHz), corresponding to an SPL threshold of 26 dB re 1 μPa.. By comparison the most sensitive fish is the soldier fish, whose threshold is 0.. 32 mPa (50 dB re 1 μPa) at 1.. 3 kHz, whereas the lobster has a hearing threshold of 1.. 3 Pa at 70 Hz (122 dB re 1 μPa).. Safety thresholds.. High levels of underwater sound create a potential hazard to marine and amphibious animals as well as to human divers.. Guidelines for exposure of human divers and marine mammals to underwater sound are reported by the SOLMAR project of the NATO Undersea Research Centre.. Human divers exposed to SPL above 154 dB re 1 μPa in the frequency range 0.. 6 to 2.. 5 kHz are reported to experience changes in their heart rate or breathing frequency.. Diver aversion to low frequency sound is dependent upon sound pressure level and center frequency.. Source :..

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  • Title: Applications UA.html www.uam2009.gr
    Descriptive info: Sonar.. Main article: Sonar.. Sonar is the name given to the acoustic equivalent of radar.. Pulses of sound are used to probe the sea, and the echoes are then processed to extract information about the sea, its boundaries and submerged objects.. An alternative use, known as passive sonar, attempts to do the same by listening to the sounds radiated by underwater objects.. Underwater communication.. Main article: Underwater acoustic communication.. The need for underwater acoustic telemetry exists in applications such as data harvesting for environmental monitoring, communication with and between manned and unmanned underwater vehicles, transmission of diver speech, etc.. A related application is underwater remote control, in which acoustic telemetry is used to remotely actuate a switch or trigger an event.. A prominent example of underwater remote control are acoustic releases, devices that are used to return sea floor deployed instrument packages or other payloads to the surface per remote command at the end of a deployment.. Acoustic communications form an active field of research with significant challenges to overcome, especially in horizontal, shallow-water channels.. Compared with radio telecommunications, the available bandwidth is reduced by several orders of magnitude.. Moreover, the low speed of sound causes multipath propagation to stretch over time delay intervals of tens or hundreds of milliseconds, as well as significant Doppler shifts and spreading.. Often acoustic communication systems are not limited by noise, but by reverberation and time variability beyond the capability of receiver algorithms.. The fidelity of underwater communication links can be greatly improved by the use of hydrophone arrays, which allow processing techniques such as adaptive beamforming and diversity combining.. Underwater Navigation and Tracking.. Main article:  ...   wavelength, low frequency sounds are preferred because high frequencies are heavily attenuated when they travel through the seabed.. Sound sources used include airguns, vibroseis and explosives.. Weather and climate observation.. Acoustic sensors can be used to monitor the sound made by wind and precipitation.. For example, an acoustic rain gauge is described by Nystuen.. Lightning strikes can also be detected.. Acoustic thermometry of ocean climate (ATOC) uses low frequency sound to measure the global ocean temperature.. Oceanography.. [icon] This section requires expansion.. (May 2008).. Main article: Acoustical oceanography.. Large scale ocean features can be detected by acoustic tomography.. Bottom characteristics can be measured by side-scan sonar and sub-bottom profiling.. Marine biology.. Main article: Bioacoustics.. Due to its excellent propagation properties, underwater sound is used as a tool to aid the study of marine life, from microplankton to the blue whale.. Echo sounders are often used to provide data on marine life abundance, distribution, and behavior information.. Echo sounders, also referred to as hydroacoustics is also used for fish location, quantity, size, and biomass.. Acoustic telemetry is also used for monitoring fishes and marine wildlife.. An acoustic transmitter is attached to the fish (sometimes internally) while an array of receivers listen to the information conveyed by the sound wave.. This enables the researchers to track the movements of individuals in a small-medium scale.. Particle physics.. A neutrino is a fundamental particle that interacts very weakly with other matter.. For this reason, it requires detection apparatus on a very large scale, and the ocean is sometimes used for this purpose.. In particular, it is thought that ultra-high energy neutrinos in seawater can be detected acoustically..

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  • Title: Communications.html www.uam2009.gr
    Descriptive info: Cooperative autonomous platforms.. We believe that the future of marine sensing lies in cooperative autonomous assets working together to provide a coherent picture of the marine environment.. In line with this, we work with fixed and mobile platforms, both underwater and on the water surface, for sensing applications.. Under the STARFISH program, we have developed our own team of cooperative modular AUVs.. We are working with GraalTech, a company that developed the hybrid glider-like Folaga AUV, to develop an enhanced eFolaga that is modular and can cooperate with our STARFISH AUVs.. In collaboration with MIT, under the CENSAM program, we are exploring cooperative environmental monitoring using our STARFISH AUVs, MIT's surface kayaks and other fixed sensing platforms.. In other projects, we explore the use of teams of AUVs in off-shore surveying and port security applications.. We also have developed fixed underwater and surface platforms for sensing for ambient noise monitoring and real-time water quality monitoring.. The PANDA is an underwater fixed buoy that allows easy diver-free deployment and recovery.. We have used PANDAs for ambient noise data collection and cooperative target tracking so far, and expect to use them as navigational beacons and for environmental sensing in the near future.. DSAAV is a distributed software platform originally developed for the STARFISH AUV, but now being made available to researchers interested in implementing distributed components in autonomous marine systems.. STARFISH AUV.. PANDA.. Acoustic Modem.. Underwater acoustic communications and networking.. In order to have underwater assets cooperate, we need them to communicate.. As EM waves are not effective for medium-long range communication  ...   echolocation in conditions where vision is limited (e.. turbid water or at night).. Cross-modal matching-to-sample studies have shown that object shape can be directly perceived through echolocation in a holistic manner, similar to the direct shape perception of shape through vision.. No man-made sonar of comparable bandwidth can perform this feat.. We are currently investigating the dolphin's ability to recognize shape through echolocation with an aim to understand the underlying signal processing that the animal employs.. We have been investigating the vocalizations of humpback whales that come to the wintering grounds around the four-island region of Maui, Molokai, Lanai and Kaho'olawe each year between December and April.. Humpback whales produce songs that typically last about 10-12 minutes.. The function of humpback whale song remains unclear although several explanations have been offered over the years.. We have developed instrumentation that allows us to make field measurements on the source level, directionality and source location of the sounds produced by overlaying acoustic contours on video images of these animals (Potter et al.. 2003).. On a very different front, we have developed a real-time acoustic bandwidth compression algorithm that enables acoustic signals with large bandwidth to be compressed into a bandwidth that humans can hear.. The application of this algorithm is to enhance the diver experience, by enabling him or her to appreciate the rich soundscape the underwater world has to offer.. We have demonstrated that a stereo implementation of the algorithm enables the diver to localize the sound source.. This further enhances the experience and may potentially improve dive safety.. nus.. edu.. sg..

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  • Title: contact.html www.uam2009.gr
    Descriptive info: Name:.. Email:.. Message:.. Πόσο κάνει 8 + 1..

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  • Title: Links.html www.uam2009.gr
    Descriptive info: Links:..

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  • Title: Transport companies.html www.uam2009.gr
    Descriptive info: Transport companies use specialized staff to do the job.. Also a good transport company use advanced equipment and addressed to both retail and professional.. These are the transport company's advantages especially in U.. K.. Transport companies can transfer musical instruments, business equipment, and art.. Also transport companies are capable to transfer goods.. Using transport companies is the easiest way to transfer your belongings..

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  • Title: SEO.html www.uam2009.gr
    Descriptive info: You use SEO when you want to promote your website.. Also you use SEO when you want to increase your visibility to your target audience.. When you are searching for the better way to improve your online profile you have to use SEO.. As SEO we define the promotion of the website in search engine results.. SEO is an IT technique that in the end helps companies to make large sales.. Also SEO help companies grow their customer base on the internet..

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