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Anne Juliana Gonzaga became a Servant of Mary following the death of her husband, Ferdinand II, Archduke of Austria in 1595, after receiving a vision of the Madonna, to whom her parents had prayed to cure her of a childhood illness? GeoHub is a portal of open location-based data from city departments that empowers both the public and city employees to explore, analyze and build on the data.
Youths are highly enthusiastic about starting their own businesses in order to realize their dreams.
Hundreds of runners and walkers gathered in the afternoon of November 8, 2015 at Ap Lei Chau for the 12th CyberRun for the Rehabilitation with the theme of “Sunset Jogging to Cyberport”. Esri China (HK) participated in the 20th Anniversary Ceremony of our long-term business partner NetCraft Information Technology (Macau) Co. Esri User Conference (Esri UC) 2015 was once again successfully held in San Diego from July 18-24. In Esri User Conference every year, Esri presents hundreds of organizations worldwide with Special Achievement in GIS (SAG) Awards. GIS professionals, users and friends who open the website of Esri China (Hong Kong) every day may have a pleasant surprise in early August. Smart City promises to enhance the quality of city living by using Information and Communication Technology and related initiatives are generating interests among different sectors in the city. The revamped Statutory Planning Portal 2 (SPP2) of Town Planning Board launched last fall has quickly become one of the most popular website providing public information. The 7.8 magnitude earthquake occurred in Nepal on 25 Apr 2015 has taken over 8,000 lives and injured over 19,000 people. Esri is supporting organizations that are responding to earthquake disasters with software, data, imagery, project services, and technical support. The Hong Kong Council of Social Service in 2002, the Caring Company Scheme aims at cultivating good corporate citizenship.
The Esri Asia Pacific User Conference (APUC) has finally returned to Hong Kong after a decade and the 10th Esri APUC was successfully held in 27-28th January 2015. This year, about 600 delegates from 20 countries of Asia, Oceania, Europe and North America descended upon the Hong Kong Convention and Exhibition Centre. Hard X-rays can penetrate solid objects, and their largest use is to take images of the inside of objects in diagnostic radiography and crystallography. The roentgen (R) is an obsolete traditional unit of exposure, which represented the amount of radiation required to create one electrostatic unit of charge of each polarity in one cubic centimeter of dry air. The rad is the (obsolete) corresponding traditional unit, equal to 10 millijoules of energy deposited per kilogram. The sievert (Sv) is the SI unit of equivalent dose, which for X-rays is numerically equal to the gray (Gy). X-rays are generated by an X-ray tube, a vacuum tube that uses a high voltage to accelerate the electrons released by a hot cathode to a high velocity.


In crystallography, a copper target is most common, with cobalt often being used when fluorescence from iron content in the sample might otherwise present a problem.
X-ray fluorescence: If the electron has enough energy it can knock an orbital electron out of the inner electron shell of a metal atom, and as a result electrons from higher energy levels then fill up the vacancy and X-ray photons are emitted. So the resulting output of a tube consists of a continuous bremsstrahlung spectrum falling off to zero at the tube voltage, plus several spikes at the characteristic lines.
In medical diagnostic applications, the low energy (soft) X-rays are unwanted, since they are totally absorbed by the body, increasing the dose. To generate an image of the cardiovascular system, including the arteries and veins (angiography) an initial image is taken of the anatomical region of interest. A specialized source of X-rays which is becoming widely used in research is synchrotron radiation, which is generated by particle accelerators. The most commonly known methods are photographic plates, photographic film in cassettes, and rare earth screens. Before the advent of the digital computer and before invention of digital imaging, photographic plates were used to produce most radiographic images. Since photographic plates are sensitive to X-rays, they provide a means of recording the image, but they also required much X-ray exposure (to the patient), hence intensifying screens were devised.
Areas where the X-rays strike darken when developed, causing bones to appear lighter than the surrounding soft tissue. Contrast compounds containing barium or iodine, which are radiopaque, can be ingested in the gastrointestinal tract (barium) or injected in the artery or veins to highlight these vessels. An increasingly common method is the use of photostimulated luminescence (PSL), pioneered by Fuji in the 1980s. The PSP plate can be reused, and existing X-ray equipment requires no modification to use them.
For many applications, counters are not sealed but are constantly fed with purified gas, thus reducing problems of contamination or gas aging.
Some materials such as sodium iodide (NaI) can "convert" an X-ray photon to a visible photon; an electronic detector can be built by adding a photomultiplier.
John Thomas North (pictured), originally a Yorkshire mechanic, became a friend of the future King George V and was worth $10 million in 1889?
King George V of the United Kingdom was a member of the Society for the Prevention of Calling Sleeping Car Porters "George"? 19 crewmen of the Russian oceanliner SS Czar received the Silver Sea Gallantry Medal from King George V of the United Kingdom for rescuing 102 survivors from a burning ship in October 1913? This process produces an emission spectrum of X-ray frequencies, sometimes referred to as the spectral lines. The intensity of the X-rays increases linearly with decreasing frequency, from zero at the energy of the incident electrons, the voltage on the X-ray tube.


A second image is then taken of the same region after iodinated contrast material has been injected into the blood vessels within this area.
The contrast compounds have high atomic numbered elements in them that (like bone) essentially block the X-rays and hence the once hollow organ or vessel can be more readily seen. In modern hospitals a photostimulable phosphor plate (PSP plate) is used in place of the photographic plate. The spectral lines generated depend on the target (anode) element used and thus are called characteristic lines. These two images are then digitally subtracted, leaving an image of only the iodinated contrast outlining the blood vessels.
Photographic film largely replaced these plates, and it was used in X-ray laboratories to produce medical images.
In the pursuit of a non-toxic contrast material, many types of high atomic number elements were evaluated. After the plate is X-rayed, excited electrons in the phosphor material remain "trapped" in "colour centres" in the crystal lattice until stimulated by a laser beam passed over the plate surface. Electrons accelerate toward the anode, in the process causing further ionization along their trajectory. The radiologist or surgeon then compares the image obtained to normal anatomical images to determine if there is any damage or blockage of the vessel. In more recent years, computerized and digital radiography has been replacing photographic film in medical and dental applications, though film technology remains in widespread use in industrial radiography processes (e.g.
For example, the first time the forefathers used contrast it was chalk, and was used on a cadaver's vessels. This process, known as a Townsend avalanche, is detected as a sudden current, called a "count" or "event". When the film is developed, the parts of the image corresponding to higher X-ray exposure are dark, leaving a white shadow of bones on the film. Photographic plates are mostly things of history, and their replacement, the "intensifying screen", is also fading into history. The metal silver (formerly necessary to the radiographic & photographic industries) is a non-renewable resource. Thus it is beneficial that this is now being replaced by digital (DR) and computed (CR) technology. Where photographic films required wet processing facilities, these new technologies do not.



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