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| [[Image:Clampco Sistemi Efield probe FP2000.jpg|thumb|300px| Electric field probe FP2000 (range 100 kHz – 2500 MHz)]]
| | Today, there are several other types of web development and blogging software available to design and host your website blogs online and that too in minutes, if not hours. What I advise you do next is save the backup data file to a remote place like a CD-ROM, external disk drive if you have one or a provider such as Dropbox. A pinch of tablet centric strategy can get your Word - Press site miles ahead of your competitors, so here are few strategies that will give your Wordpress websites and blogs an edge over your competitors:. Hosted by Your Domain on Another Web Host - In this model, you first purchase multiple-domain webhosting, and then you can build free Wordpress websites on your own domains, taking advantage of the full power of Wordpress. If you are happy with your new look then click "Activate 'New Theme'" in the top right corner. <br><br>Always remember that an effective linkwheel strategy strives to answer all the demands of popular search engines while reacting to the latest marketing number trends. Some of the Wordpress development services offered by us are:. It sorts the results of a search according to category, tags and comments. t need to use the back button or the URL to get to your home page. Aided by the completely foolproof j - Query color selector, you're able to change the colors of factors of your theme a the click on the screen, with very little previous web site design experience. <br><br>If you loved this article therefore you would like to get more info with regards to [http://iz.sa/wordpressdropboxbackup134969 wordpress backup] nicely visit the web site. The least difficult and very best way to do this is by acquiring a Word - Press site. s cutthroat competition prevailing in the online space won. all the necessary planning and steps of conversion is carried out in this phase, such as splitting, slicing, CSS code, adding images, header footer etc. Provide the best and updated information to the web searchers and make use of these wonderful free themes and create beautiful websites. Converting HTML to Word - Press theme for your website can allow you to enjoy the varied Word - Press features that aid in consistent growth your online business. <br><br>The next thing I did after installing Wordpress was to find myself a free good-looking Wordpress-theme offering the functionality I was after. php file in the Word - Press root folder and look for this line (line 73 in our example):. To do this, you should link your posts to other relevant posts that you've created. So, we have to add our social media sharing buttons in website. Word - Press offers constant updated services and products, that too, absolutely free of cost. <br><br>Millions of individuals and organizations are now successfully using this tool throughout the world. When you sign up with Wordpress, you gain access to several different templates and plug-in that allow you to customize your blog so that it fits in with your business website design seamlessly. You can select color of your choice, graphics of your favorite, skins, photos, pages, etc. You should stay away from plugins that are full of flaws and bugs. 95, and they also supply studio press discount code for their clients, coming from 10% off to 25% off upon all theme deals. |
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| '''EMF measurements''' are measurements of ambient (surrounding) [[electromagnetic fields]] that are performed using particular sensors or probes, such as EMF meters. These probes can be generally considered as [[Antenna (radio)|''antennas'']] although with different characteristics. In fact probes should not perturb the electromagnetic field and must prevent coupling and reflection as much as possible in order to obtain precise results. EMF measurements are nowadays becoming important and widespread in different sectors to assess environmental and human exposure to [[non-ionizing radiation]] in many contexts. There are two main types of EMF measurements:
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| *''broadband measurements'' performed using a broadband probe, that is a device which senses any signal across a wide range of frequencies and is usually made with three independent diode [[detector (radio)|detectors]];
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| *''frequency selective measurements'' in which the measurement system consists of a field antenna and a frequency selective receiver or spectrum analyzer allowing to monitor the frequency range of interest.
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| EMF probes may respond to fields only on one axis, or may be tri-axial, showing componets of the field in three directions at once. Amplified, active, probes can improve measurement precision and sensitivity but their active components may limit their speed of response.
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| ==Ideal isotropic measurements==
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| [[Image:E field reconstruction.gif|thumb|300px|E-field projections on an orthogonal reference frame]]
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| Measurements of the EMF are obtained using an E-field sensor or H-field sensor which can be isotropic or mono-axial, active or passive.
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| A mono-axial, omnidirectional probe is a device which senses the Electric ([[Hertzian dipole|short dipole]]) or Magnetic field [[Polarization (waves)|linearly polarized]] in a given direction.
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| Using a mono-axial probe implies the need for three measurements taken with the sensor axis set up along three mutually orthogonal directions, in a ''X, Y, Z'' configuration.
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| As an example, it can be used a probe which senses the Electric field component parallel to the direction of its axis of symmetry. In these conditions, where E is the amplitude of incident electric field, and θ is the amplitude of the angle between sensor axis and direction of electric field E, the signal detected is proportional to |E|cos θ (''right''). This allows to obtain the correct total amplitude of the field in the form of
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| :<math>|E|= \sqrt{E_x^2+E_y^2+E_z^2}</math>
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| or, in case of the magnetic field
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| :<math>|H|= \sqrt{H_x^2+H_y^2+H_z^2}</math>
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| An [[isotropy|isotropic]](tri-axial) probe simplifies the measurement procedure because the total field value is determined with three measures taken without changing sensor position: this results from the geometry of the device which is made by three independent broadband sensing elements placed orthogonal to each other. In practice, each element’s output is measured in three consecutive time intervals supposing field components being time stationary .
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| [[Image:Clampco Sistemi xyz conf FP2000.jpg|center|500px]] | |
| [[Image:Clampco Sistemi Isotropic antenna AT3000.jpg|thumb|Isotropic antenna AT3000 (passive probe, 20 MHz – 3000 MHz)]]
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| ==Meters==
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| An ''EMF meter'' is a scientific instrument for measuring [[electromagnetic field]]s (abbreviated as EMF). Most meters measure the [[electromagnetic radiation]] [[flux density]] (DC fields) or the change in an electromagnetic field over time (AC fields), essentially the same as a radio antenna, but with quite different detection characteristics.
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| The two largest categories are single axis and tri-axis. Single axis meters are cheaper than a tri-axis meters, but take longer to complete a survey because the meter only measures one dimension of the field. Single axis instruments have to be tilted and turned on all three axes to obtain a full measurement. A tri-axis meter measures all three axes simultaneously, but these models tend to be more expensive. | |
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| Electromagnetic fields can be generated by [[alternating current|AC]] or [[DC current]]s. An EMF meter can measure AC electromagnetic fields, which are usually emitted from man-made sources such as electrical wiring, while [[gaussmeter]]s or magnetometers measure DC fields, which occur naturally in Earth's [[geomagnetic field]] and are emitted from other sources where direct current is present.
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| [[Image:Ext trifield3axisuhsmeter.jpg|thumb|right|200px|An example of an EMF meter.]]
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| ===Sensitivity===
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| As most electromagnetic fields encountered in everyday situation are those generated by household or industrial appliances, the majority of EMF meters available are calibrated to measure 50 and 60 [[Hertz|Hz]] alternating fields (the [[frequency]] of US and European [[mains electricity]]). There are other meters which can measure fields alternating at as low as 20 Hz, however these tend to be much more expensive and are only used for specific research purposes.
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| ==Active and passive sensors==
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| Active sensors are sensing devices which contain active components; usually this solution allows for a more precise measurement with respect to passive components.
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| In fact, a passive receiving antenna collects energy from the electromagnetic field being measured and makes it available at a RF cable connector. This signal then goes to the spectrum analyzer but the field characteristics can be someway modified by the presence of the cable, especially in [[near and far field|near-field]] conditions.
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| On the other hand an effective solution is to transfer on an optical carrier, the electric (or magnetic) field component sensed with an active probe.
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| The basic components of the system are a receiving electro-optical antenna which is able to transfer, on an optical carrier, the individual electric (or magnetic) field component picked up and to return it in the form of an electrical signal at the output port of an opto-electric converter.
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| [[Image:Optical modulation.gif|thumb|350px]]
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| The modulated optical carrier is transferred by means of a fiber-optic link to a converter which extracts the modulating signal and converts it back to an electrical signal.
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| The electrical signal thus obtained can be then sent to a spectrum analyzer with a 50 Ω common RF cable.
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| ==Isotropic deviation==
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| [[Image:Short dipole radiation pattern.gif|thumb|350px|Short dipole radiation pattern]]
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| {{anchor|isotropic deviation}}
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| Isotropic deviation, in EMF measurements, is a parameter that describes the accuracy in measuring field intensities irrespective of the probe’s orientation.
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| If the field is obtained by three measurements in an orthogonal ''X, Y, Z'' configuration in the form:
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| :<math>|E|= \sqrt{E_x^2+E_y^2+E_z^2}</math>
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| a sufficient condition for the expression to be true for every three [[orthogonal coordinates]] ''(X,Y,Z) '' is for the probe [[radiation pattern]] to be as close as possible to ideal [[Hertzian Dipole|short dipole]] pattern, called sin θ:
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| :<math> f(\theta, \phi)= A\cdot \sin(\theta)</math>,
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| where A is function of frequency.
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| The difference between ideal dipole radiation pattern and real probe pattern is called ''isotropic deviation''.
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| ==See also==
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| * [[Extech Instruments]]
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| ==References==
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| '''Bibliography'''
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| *{{cite conference |first= G|last= Solari|authorlink= |coauthors= Viciguerra, G; Clampco Sistemi|title= Frequency Selective Measurements of Electric Field (100kHz-2.5GHz) and Magnetic Field (100kHz-120MHz) with Active Electro-Optical Receiving Antennas|conference= The 16th International Zurich Symposium and Technical Exhibition on Electromagnetic Compatibility - EMC Zurich 2005|conferenceurl= http://www.emc-zurich.ch/emc05/emc05.html |date=February 2005|url= http://www.clampco.it/content/en/clampco_products/EMC_EMI_antennas.html?download_pdf=frequency_selective_measurement_with_active_probes.pdf |format= PDF|accessdate= 2009-07-13}}
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| {{Antenna_Types}}
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| {{pollution}}
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| [[Category:Radio frequency antenna types]]
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| [[Category:Environmental engineering]]
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