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15/8/2007 - The House of Virgin Mary
15/8/2007 - Lazer
15/8/2007 - Tooth
15/8/2007 - Energy development
15/8/2007 - The House of Virgin Mary
Yazar: yusufkoc
"Now there was standing by the cross of Jesus His Mother and Mother's sister, Mary of Cleophas, and Mary Magdalane. When Jesus, therefore, saw His Mother and his disciple standing by, whom He loved, He said to His Mother, "Woman, behold thy son." Then He said to the disciple, " Behold thy mother" And from that hour the disciple took her unto his home."
St John 19:25-27

That was the last mention of Virgin Mary in the Bible. After Jesus died, St.John and the Virgin Mary came together to Ephesus, and for a short time stayed in the building, a section of which is now under Church of the Virgin Mary today. Later St. John moved the Virgin Mary to a house he had prepared for her on Mt. Nightingale (bülbül) by the time, the location of the house Mary spend the last days of her life was forgotten in the ruins.

Virgin Mary has disappeared in the history till the end of the 18th century, when 38 years old-nun Sister Anne Catherine Emmerich started to have some visions about the house on the hill. She was a daugter of poor farm laborers and never went to school. She had very fragile health but strong beliefs. She concantrated her life to Christanity and to Church. At the beginning of 1812 her first stigmata appeared. She has seen  covered with blood on her hands without a reason. Medical help was imcapable to diognase this kind of illness. For last twelve years of her life she was in pain, bedridden and having visions which began to attract people and made her story quite known in the Münster region. Clemens von Brentano, the German poet who was with her from 1818 till 1824, has transcripted some accounts of her visions. After fifty years later his transcriptions published. The visions as recorded by Breantano, were mostly about life of Jesus and Mary. There were also phases about the location of the house, house itself and Mary's death.

At the end of 1880, the book of Brentano has also been red by the French Abbot, Father Julien Gouyet. He decided to search the region according to Sister Emmerich's descriptions. He also found the ruins of the house. When he reported this expedition to Vatican, however they appreciated his effort but didnt agree the result which meant "The house of Virgin Mary has discovered." So they labeled this as an embraccing discovery and they dropped the matter.

The Life and Dolorous Passion of Our Lord Jesus Christ According to the Visions of Catherine Emmerich ... In 1890, The priest, Father Poulin, red the book with a great interest. He told other priests about the book and they decided to set a group to explore the location of the house. The Group, leaded by Father Jung, inspected all the region around Ephesus and finally they discovered the ruins of the house on the Nightingale Mountain. In 1896 the Church officially declared the ruins are truly the remains of the House of Virgin Mary. Since then it has become popular place of pilgrimage for Christians and holy place for the Muslims because of the special status accorded to Mary in Islam.

The house located on the Nightingale (bülbül) Mountain, 9 km to Ephesus (ancient city), 35 km to Izmir (Smyrna). The bronze statue of Virgin Mary welcoming visitors, standing at the beginning of the walkway through the house. The olive trees planted by Father Jung's men, are escorting the path and on the side walls two marble plaques honoring Sister Glancey, Fathers Jung and Paulin. There is a large tree, shading the entrance of the house. In to the house, after passing archway, twinkling  candles are lightening the room by playing with the shadows. There is an altar with a statue of Virgin Mary on second part of the room which is divided by an another archway. To the left of the altar, there lies Mary's bedchamber in the soft light coming through high windows of the room. The house is in a typical Roman architectural style, entirely made of stones, also has been restored in 1940's. Today only the central part and the room on the right are open for visitors.

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15/8/2007 - Lazer
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In physics, a laser is a device that emits light through a specific mechanism for which the term laser is an acronym: Light Amplification by Stimulated Emission of Radiation. This is a combined quantum-mechanical and thermodynamical process discussed in more detail below. As a light source, a laser can have various properties, depending on the purpose for which it is designed. A typical laser emits light in a narrow, low-divergence beam and with a well-defined wavelength (corresponding to a particular color if the laser is operating in the visible spectrum). This is in contrast to a light source such as the incandescent light bulb, which emits into a large solid angle and over a wide spectrum of wavelength. These properties can be summarized in the term coherence.

A laser consists of a gain medium inside an optical cavity, with a means to supply energy to the gain medium. The gain medium is a material (gas, liquid, solid or free electrons) with appropriate optical properties. In its simplest form, a cavity consists of two mirrors arranged such that light bounces back and forth, each time passing through the gain medium. Typically, one of the two mirrors, the output coupler, is partially transparent. The output laser beam is emitted through this mirror.

Light of a specific wavelength that passes through the gain medium is amplified (increases in power); the surrounding mirrors ensure that most of the light makes many passes through the gain medium.

 

Part of the light that is between the mirrors (i.e., is in the cavity) passes through the partially transparent mirror and appears as a beam of light. The process of supplying the energy required for the amplification is called pumping and the energy is typically supplied as an electrical current or as light at a different wavelength. In the latter case, the light source can be a flash lamp or another laser. Most practical lasers contain additional elements that affect properties such as the wavelength of the emitted light and the shape of the beam.

The first working laser was demonstrated in May 1960 by Theodore Maiman at Hughes Research Laboratories. Recently, lasers have become a multi-billion dollar industry. The most widespread use of lasers is in optical storage devices such as compact disc and DVD players, in which the laser (a few millimeters in size) scans the surface of the disc. Other common applications of lasers are bar code readers and laser pointers. In industry, lasers are used for cutting steel and other metals and for inscribing patterns (such as the letters on computer keyboards). Lasers are also commonly used in various fields in science, especially spectroscopy, typically because of their well-defined wavelength or short pulse duration in the case of pulsed lasers. Lasers are also used for military and medical applications.

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15/8/2007 - Tooth
Yazar: yusufkoc

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Teeth (singular, tooth) are structures found in the jaws of many vertebrates that are used to tear, scrape, and chew food. Some animals, particularly carnivores, also use teeth for hunting or defense. The roots of teeth are covered by gums.Teeth are among the most distinctive (and long-lasting) features of mammal species. Paleontologists use teeth to identify fossil species and determine their relationships. The shape of an animal's teeth is related to its diet. For example, plant matter is hard to digest, so herbivores have many molars for chewing. Carnivores, on the other hand, need canines to kill and tear meat.Humans are diphyodont, meaning that they develop two sets of teeth. The first set (the "baby," "milk," "primary" or "deciduous" set) normally starts to appear at about six months of age, although some babies are born with one or more visible teeth, known as neonatal teeth. Normal tooth eruption at about six months is known as teething and can be quite painful for an infant.Some animals develop only one set of teeth (monophyodont) while others develop many sets (polyphyodont). Sharks, for example, grow a new set of teeth every two weeks to replace worn teeth. Rodent incisors grow and wear away continually through gnawing, maintaining relatively constant length. Some rodent species, such as the sibling vole and the guinea pig, have continuously growing molars in addition to incisors

Dental anatomy is a field of anatomy dedicated to the study of tooth structures. The development, appearance, and classification of teeth fall within its purview, though dental occlusion, or contact among teeth, does not. Dental anatomy is also a taxonomical science as it is concerned with the naming of teeth and their structures. This information serves a practical purpose for dentists, enabling them to easily identify teeth and structures during treatment.The anatomic crown of a tooth is the area covered in enamel above the cementoenamel junction.The majority of the crown is composed of dentin with the pulp chamber in the center.The crown is within bone before eruption. After eruption, it is almost always visible. The anatomic root is found below the cementoenamel junction and is covered with cementum. As with the crown, dentin composes most of the root, which normally have pulp canals. A tooth may have multiple roots or just one root. Canines and most premolars, except for maxillary (upper) first premolars, usually have one root. Maxillary first premolars and mandibular molars usually have two roots. Maxillary molars usually have three roots. Additional roots are referred to as supernumerary roots.

Humans usually have 20 primary teeth (also called deciduous, baby, or milk teeth) and 32 permanent teeth. Among primary teeth, 10 are found in the maxilla and the other 10 in the mandible Teeth are classified as incisors, canines, and molars. In the primary set of teeth, there are two types of incisors, centrals and laterals, and two types of molars, first and second. All primary teeth are replaced with permanent counterparts except for molars, which are replaced by permanent premolars. Among permanent teeth, 16 are found in the maxilla with the other 16 in the mandible. The maxillary teeth are the maxillary central incisor, maxillary lateral incisor, maxillary canine, maxillary first premolar, maxillary second premolar, maxillary first molar, maxillary second molar, and maxillary third molar. The mandibular teeth are the mandibular central incisor mandibular lateral incisor, mandibular canine, mandibular first premolar, mandibular second premolar, mandibular first molar, mandibularsecond molar, and mandibular third molar. Third molars are commonly called "wisdom teeth" and may never erupt into the mouth or form at all. If any additional teeth form, for example, fourth and fifth molars, which are rare, they are referred to as supernumerary teeth.

Most teeth have identifiable features that distinguish them from others. There are several different notation systems to refer to a specific tooth. The three most commons systems are the FDI World Dental Federation notation, the universal numbering system, and Palmer notation method. The FDI system is used worldwide, and the universal is used widely in the United States.Oral hygiene is the practice of keeping the mouth clean and is a means of preventing dental caries, gingivitis, periodontal disease, bad breath, and other dental disorders. It consists of both professional and personal care. Regular cleanings, usually done by dentists and dental hygienists, remove tartar (mineralized plaque) that may develop even with careful brushing and flossing. Professional cleaning includes tooth scaling, using various instruments or devices to loosen and remove deposits from teeth.The purpose of cleaning teeth is to remove plaque, which consists mostly of bacteria. Healthcare professionals recommend regular brushing twice a day (in the morning and in the evening, or after meals) in order to prevent formation of plaque and tartar. A toothbrush is able to remove most plaque, excepting areas between teeth. As a result, flossing is also considered a necessity to maintain oral hygiene. When used correctly, dental floss removes plaque from between teeth and at the gum line, where periodontal disease often begins and could develop caries. Electric toothbrushes not considered more effective than manual brushes for most people.The most important advantage of electric toothbrushes is their ability to aid people with dexterity difficulties, such as those associated with rheumatoid arthritis.In addition, fluoride therapy is often recommended to protect against dental caries. Water fluoridation and fluoride supplements decrease the incidence of dental caries. Fluoride helps prevent dental decay by binding to the hydroxyapatite crystals in enamel.The incorporated fluoride makes enamel more resistant to demineralization and thus more resistant to decay. Topical fluoride, such as a fluoride toothpaste or mouthwash, is also recommended to protect teeth surfaces. Many dentists include application of topical fluoride solutions as part of routine cleanings.

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15/8/2007 - Energy development
Yazar: yusufkoc
Gas flare from an oil refinery.     The Moss Landing Power Plant burns natural gas to produce electricity in California.                                                 

Dependence on external energy sources

Main article: Petroleum dependence

Technologically advanced societies have become increasingly vulnerable in their dependence on external energy sources for transportation, the production of many manufactured goods, and the delivery of energy services. This energy allows people, in general, to live under otherwise unfavorable climatic conditions through the use of heating, ventilatio, and/or air conditioning. Level of dependence of human societies on external energy sources differs, as does the climate, convenience, traffic congestion, pollution, production, and greenhouse gas emissions of each society.

Increased levels of human comfort generally induce increased dependence on external energy sources. Conversely, comfort can also be realized with lowered energy consumption by the application of energy efficiency and conservation approaches. Wise energy use therefore embodies the idea of balancing human comfort with reasonable energy consumption levels by researching and implementing effective and sustainable energy harvesting and utilization measures.

As an example of external energy dependence, U.S. President George W. Bush has stated that "America is addicted to oil, which is often imported from unstable parts of the world."[1] Another example is the growing reliance on energy supplies to Europe from Russia.

Main article: Hydroelectricity

In hydro energy, the gravitational descent of a river is compressed from a long run to a single location with a dam or a flume. This creates a location where concentrated pressure and flow can be used to turn turbines or wate wheels, which drive a mechanical mill or an electric generator

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