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A box girder bridge is a bridge in which the beams are made up of box shaped girders. The box girders consist of concrete, steel or a combination of both. Most of the modern elevated structures are built on the basis of the box girder bridge. Most of us have travel on the box girder bridges regularly. The most common e... |
and the structures built for light rail transport. They can sustain heavy weight and hence used in the construction of flyovers. These are used to construct crossways for pedestrians. Box girders are used on cable styled bridges and other forms but generally they are a form of Beam Bridges. The support beams of the gir... |
This hollow box can have the shape of a rectangle, tightly coupled triangles or trapezium. The box girder bridges offer a stronger support for bridges constructed with an arch. The most famous Bay Bridge in California, connecting San Francisco and Oakland is a classic example of the Box girder bridge. The box girder br... |
factory and assembled onsite. The girders can also be made up (EDIT : these are still being made so I think it should be are made of than can also be made of)of high performance, prestressed, reinforced concrete or a mixture of both concrete and steel. Both the girders and bridges can be manufactured elsewhere and inst... |
prefabricated. That is the beauty of this construction. The bridge can be installed in its position by incremental launching. Huge cranes are used to place the new segments onto the completed portions of the bridge until the whole structure is completely assembled. Box girder bridges have a number of key advantages whe... |
torsion. This is beneficial especially for a curved bridge. Larger girders and stronger flanges can be used as this allows for a longer span between the support posts that hold the bridge. The huge hollow boxes can be used to place the Water lines, telephone cables and other utility lines. Box girders are more expensiv... |
need of a confined space inside the box. There were major disasters that occurred when the West Gate Bridge of Australia and Cleddau Bridge of UK collapsed. But these disasters gave rise to a new design in the box girder bridges. Bridges being constructed these days are being designed keeping in mind the occurrences of... |
high magnitude earthquake. One of the major threats is the corrosion of steel cables inside the bridge. Recently in 2009, an inspection was conducted on the Cline Avenue Bridge over the Indiana harbor and the ship canal. This inspection revealed a serious corrosion of the steel cables and the steel within the girders o... |
corroded that there was no solution to this and the bridge had to be closed down permanently. Therefore these bridges have to be checked regularly and serviced to prevent corrosion. Using high grade steel and corrosion free metals or alloys in the construction of box girder bridges can help in preventing the bridges fr... |
Scientists gets further evidence that Mars once had oceans Mars, our neighbor, once the dreams of science fiction writers and astronomers, one of which only wrote about the live that could have lived on Mars, and still might; while the other seeks to prove that there might actually have been life on that red planet eon... |
able to show that there was water on the surface of Mars, water that would have been the foundation of life, just as it is here on earth. To help find the facts behind whether there was, or even still is, water on Mars the European Space Agency (ESA) Mars Express space craft which houses the Mars Advanced Radar for Sub... |
(MARSIS) has detected sediment on the planet, the type of sediment that you would find on the floor of an ocean. It is within the boundaries of features tentatively identified in images from various spacecraft as shorelines that MARSIS detected sedimentary deposits reminiscent of an ocean floor. “MARSIS penetrates deep... |
of the planet’s subsurface,” says Wlodek Kofman, leader of the radar team at the Institut de Planétologie et d’Astrophysique de Grenoble (IPAG). “Throughout all of this depth, we see the evidence for sedimentary material and ice.” The sediments detected by MARSIS are areas of low radar reflectivity, which typically ind... |
final resting place. Scientists are interpreting these sedimentary deposits, which may still be ice-rich, as another indication that there once an ocean in this spot. At this point scientists have proposed that there were two main oceans on the planet. One was aroun the 4 billion year ago range with the second at aroun... |
Its an interesting question. But since doctors dont really know the answer, youve caught the scientific community napping as well. Even so, several things come to mind. The first thing to consider is the possibility that you nap because you have daytime sleepiness. If so, then what might be the |
cause? - Do you take any medicine that might make you sleepy? Review your prescriptions with your pharmacist or next time you visit your doctor. - Have you started having problems sleeping at night? If you sleep well at night and wake up refreshed, dont worry. But if you feel |
groggy or have early morning headaches, you may have sleep apnea or some other cause of interrupted sleep. - Could you be depressed? Ask yourself if you no longer enjoy activities that previously gave you pleasure, and whether you are feeling low. It sounds as if your nap is voluntary |
and enjoyable. So it probably does not reflect an underlying sleep disturbance. If it refreshes your day without making it hard for you to sleep at night, snooze away. For most people, a 20- to 40-minute nap between noon and 4:00 p.m. is the best way to catch a few |
winks without disturbing the sleep-wake cycle. But remember to give yourself a good 10 minutes to wake up gently before you engage in mentally or physically demanding tasks. When NASA and the FAA studied napping in airline pilots, they found that napping improved mental alertness and performance. Many night shift |
workers are also perked up by naps as brief as 1520 minutes. Do naps improve overall health? Napping is the exception in America. But afternoon siestas are the rule in many Mediterranean and Latin American countries. Scientists have learned that blood pressure drops during a siesta. But it rises abruptly |
on awakening. Is this meaningful? Probably not, but we cant be sure. Until doctors dream up a way to resolve the contradiction, there is no reason for you to deprive yourself of a pleasurable nap. |
What Is It? A Morton's neuroma is a benign (noncancerous) swelling along a nerve in the foot that carries sensations from the toes. The reason the nerve starts to swell is unknown. But once swelling begins, the nearby bones and ligaments put pressure on the nerve, causing more irritation and inflammation. This produces... |
sensations in the toes. A Morton's neuroma also is called an interdigital neuroma, intermetatarsal neuroma or a forefoot neuroma. A Morton's neuroma usually develops between the third and fourth toes. Less commonly, it develops between the second and third toes. Other locations are rare. It also is rare for a Morton's ... |
time. The condition is much more common in women than men, probably as a result of wearing high-heeled, narrow-toed shoes. This style of shoe tends to shift the bones of the feet into an abnormal position, which increases the risk that a neuroma will form. Being overweight also increases the risk of a Morton's neuroma.... |
burning pain, numbness or tingling at the base of the third, fourth or second toes. Pain also can spread from the ball of the foot out to the tips of the toes. In some cases, there also is the sensation of a lump, a fold of sock or a "hot pebble" between the toes. Typically, the pain of a Morton's |
neuroma is relieved temporarily by taking off your shoes, flexing your toes and rubbing your feet. Symptoms may be aggravated by standing for prolonged periods or by wearing high heels or shoes with a narrow toe box. Your doctor will suspect that you have a Morton's neuroma based on the nature and location of your foot... |
may ask questions about your shoes -- what type of shoes you usually wear and whether these shoes have narrow toes or high heels. To rule out other causes of foot pain, your doctor may ask questions about your medical history, especially any history of arthritis, nerve and muscle problems or previous injury to your foo... |
the diagnosis, your doctor will examine your feet. He or she will look for areas of tenderness, swelling, calluses, numbness, muscle weakness and limited motion. To check for a Morton's neuroma, your doctor will squeeze the sides of your foot. Squeezing should compress the neuroma and trigger your typical pain. In some... |
webbed area between the affected toes. Pain in two or more locations on one foot, such as between both the second and third toes and the third and fourth toes, more likely indicates that the toe joints are inflamed rather than a Morton' neuroma. Based on the physical examination, your doctor usually can diagnose a Mort... |
A foot X-ray may be ordered to make sure that there isn't a stress fracture, but it will not show the actual neuroma. If the diagnosis is in doubt, your doctor may request magnetic resonance imaging (MRI) of the foot. A Morton's neuroma will not disappear on its own. Usually, the symptoms will come and go, depending on... |
of shoes you wear and how much time you spend on your feet. Sometimes, the symptoms will go away completely. It is not always possible to prevent a Morton's neuroma. However, you probably can reduce your risk by wearing comfortable shoes that have low heels, plenty of toe space and good arch support. If your Morton's n... |
doctor usually will begin treatment with conservative therapies, including: - A switch to shoes with low heels, wide toes and good arch support - Padding techniques, including metatarsal pads or toe crest pads - Shoe inserts (orthotics) to help correct any mechanical imbalance in the foot - Anti-inflammatory medication... |
(Aleve, Naprosyn and other brand names) - A local injection of anesthetic and corticosteroid medication into the affected area Inflamed or injured nerves can take months to improve, even after the underlying problem has been corrected. If your pain continues despite several months of conservative treatment, your doctor... |
through which the affected nerve travels. These types of surgery often are done under local anesthesia. If your doctor removes a portion of the affected nerve along with the neuroma, you may develop permanent numbness between the toes. When to Call a Professional Make an appointment to see a health care professional if... |
that do not improve when you wear comfortable, wide shoes. More than 80% of people with a Morton's neuroma will respond to conservative treatment. For the minority of people who have persistent, disabling symptoms, surgery may be an option. National Institute of Arthritis and Musculoskeletal and Skin Diseases National ... |
Medical Association (APMA) 9312 Old Georgetown Road Bethesda, MD 20814 American Orthopedic Foot and Ankle Society 2517 Eastlake Ave. E Seattle, WA 98102 American Academy of Podiatric Sports Medicine American College of Foot and Ankle Surgeons 8725 West Higgins Road Chicago, IL 60031-2724 |
The Current Surface Analysis map shows current weather conditions , including frontal and high/low pressure positions, satellite infrared (IR) cloud cover , and areas of precipitation . A surface weather |
analysis is a special type of weather map that provides a view of weather elements over a geographical area at a specified time based on information from ground-based weather stations. |
Weather maps are created by plotting or tracing the values of relevant quantities such as sea level pressure, temperature , and cloud cover onto a geographical map to help find |
synoptic scale features such as weather fronts. The first weather maps in the 19th century were drawn well after the fact to help devise a theory on storm systems. After |
the advent of the telegraph, simultaneous surface weather observations became possible for the first time, and beginning in the late 1840s, the Smithsonian Institution became the first organization to draw |
real-time surface analyses. Use of surface analyses began first in the United States, spreading worldwide during the 1870s. Use of the Norwegian cyclone model for frontal analysis began in the |
late 1910s across Europe, with its use finally spreading to the United States during World War II. Surface weather analyses have special symbols which show frontal systems, cloud cover , |
or other important information. For example, an H may represent high pressure, implying good and fair weather. An L on the other hand may represent low pressure, which frequently accompanies |
precipitation . Various symbols are used not just for frontal zones and other surface boundaries on weather maps, but also to depict the present weather at various locations on the |
The African continent has not benefited adequately from its vast natural resources, including water, due to lack of sound policy and governance frameworks to ensure sustainable and equitable allocation as well as use and management of the available resources. This was said yesterday by Zanzibar Second Vice-President Se... |
the opening of the fourth International Hydrological Programme (IHP)-UNESCO Africa Water, Science, Policy and Management conference. “We must accept that not all countries in Africa have water policies and where they exist few of them address management issues adequately. I wish to stress that for sound management fram... |
This is a prerequisite for informed decision making at the appropriate level,” he noted. He said data collection networks however are expensive to establish, operate and maintain, adding that even where such networks had been established, quite a number of them are not operational due to inadequate financial resources ... |
structures and pipelines require heavy investments, there is now a need for consideration of water as an infrastructure issue and hence requiring investment financing by the private sector. However, he said in Tanzania, for instance, the shortfall in meeting the MDG's full access of water by rural communities needs gre... |
rural and 86 percent for urban areas, while the MDG’s targets are 65 per cent and 90 per cent for rural and urban areas, respectively. “There is need for allocating adequate financial resources to the water sector accompanied by good governance for Africa to make significant and sustainable socio-economic development. ... |
said, unfortunately the freshwater situation in Africa was not encouraging. By 2025, about 18 African countries, including Tanzania, were experiencing water stress. Presently, it is estimated that more than 300 million people in Africa live in a water-scarcity environment. The amount of freshwater available for each pe... |
countries, requirements for domestic freshwater use, sanitation, industry and agriculture can’t be met. For his part, Minister for Education and Vocational Training Dr. Shukuru Kawambwa commended UNESCO and IHP for organizing the conference at a time when the whole world was yet to recover from the global financial cri... |
EḴTĪĀRĀT (choices, elections), a term used in Islamic divination and astrology in at least four principle meanings: 1. It refers to hemerologies in which each of the thirty days of a month, either synodic or conventional (e.g., the Persian hemerology), is characterized as being good (saʿd) or bad (naḥs) for |
undertaking specified activities. 2. The goodness or badness of the time for activities depends on the lunar station (manzel al-qamar) occupied by the moon. 3. The goodness or badness of the time for activities depends on the zodiacal sign occupied by the moon. 4. The type of astrology usually denominated |
catarchic (ḥokm al-nojūm) is often associated with the word eḵtīārāt; in Islamic astrology, following a Sasanian precedent, this is confounded with interrogations (masāʾel). 1. The earliest hemerologies are those of Mesopotamia, in which each day of each month is usually given a religious significance as well as a numb... |
activities to be undertaken or avoided (Labat, 1939). There also exists a far simpler form in which each day in each month is either favorable or unfavorable, or is associated with a single activity (Labat, 1943; for further Mesopotamian sources see Reiner, pp. 111-12). A Persian hemerology that may be |
related to this Mesopotamian tradition is found in the Andarz ī Ādurbād īMahraspandān (secs. 119-48, I, pp. 58-71, tr. in Zaehner, pp. 101-10). In this text the thirty days of a Persian month are identified by their associated deities, and one or two activities are advised to be engaged in |
or avoided on each. Perhaps related to a Persian tradition, though not to the Andarz of Ādurbād, is the Mandaean hemerology in chapter 8 of The Book of the Zodiac (Drower, pp. 88-92). This is a combination of three sources, excerpted for each of the thirty days of a month, |
and listing activities to be undertaken or avoided and prognostications for one who becomes ill and for one who is born on that day. Close to this is a Greek text published in Catalogus Codicum Astrologorum Graecorum (XI/1, pp. 134-44; this text cites Melampus, for whom see the lunarium conflated |
from Melampus and another “Egyptian” book in VIII/4, pp. 105-07). Reflecting to some extent the contents of the Andarz of Ādurbād is an Arabic bookattributed to Imam Jaʿfar al-Ṣādeq (see Sezgin, GAS VII, pp. 323-24, 373). It is also very close in content to the chapter of the Mandaean Book |
of the Zodiac referred to above; but in addition contains parts of the associations of the thirty days of the month with stories from the Old Testament found in many similar Byzantine hemerologies (Catalogus III, pp. 32-39, X, pp. 121-26, ascribed to David and Solomon, 196-200, 243-47, XI/2, pp. 157-62). |
The Mandaean and the Byzantine hemerologies along with Jaʿfar al-Ṣādeq’s Ketāb all share a common source. Also attributed to Jaʿfar al-Ṣādeq are the short hemerologies which, like the second Mesopotamian text (Labat, 1943), do little more than indicate that the day is favorable or unfavorable (see, e.g., Ruska,II, pp. ... |
for similar works in Syriac and Greek, see Budge, II, pp. 557-59; CCAG 8/4, pp. 102-04). Ebied and Young (p. 296, n. 3) mention a long hemerology in Arabic attributed to Daniel, Salmān the Persian, and Jaʿfar al-Ṣādeq, which, they say, has a number of features reflecting Zoroastrian concepts. They |
state that they are preparing an edition; it seems not yet to have appeared. 2. The second type of elections originated in India, where it is the basic form of their science of catarchic astrology (muhūrtaśāstra); there the operative variable is the nakṣatra in which the moon is located (Pingree, |
Jyotiḥśāstra,chap. 6, pp. 101-09). In Sasanian Persia there seems to have been an adaptation of this methodology in which the nakṣatras were given Persian names (for these names, see Henning, esp. pp. 242-46). Later, they were identified with the Arabic manāzel al-qamar; and there exists in the Ketāb al-bāreʿfī aḥkām |
al-nojūm of ʿAlī b. Abi’l-Rejāl (Sezgin, GAS VII, pp. 186-87), a chapter (21 of book 7) in which for each manzel (station) occupied by the moon are given the elections according to the Indians, to Dorotheus (in part concocted from the fifth book of his work), and to the Persians, |
as well as the fates of male and female natives and a description of the manzel’s image for use in astral magic; there is a Byzantine translation of this astrological text (Catalogus IX/1, pp. 141-56). Such a text also appears in the Ḡāyat at al-ḥakīm ascribed to Abū Maslama Majrīṭī |
(ed. H. Ritter, Leipzig, 1933, bk. 1, chap. 4, pp. 14-26; Byzantine texts are found in Catalogus V/3, pp. 90-93, VIII/1, pp. 218-19). 3. The judgement that it is or it is not propitious to begin a specified activity when the moon is in a designated zodiacal sign occurs first |
in Akkadian texts of the Seleucid period (Reiner, pp.108-11). The principal Greek source of such teachings was the astrological poem of Dorotheus of Sidon (bk. 5 passim), which had been translated into Pahlavi in the third century, and from that language was translated into Arabic by ʿOmar b. Farroḵān Ṭabarī |
(Dorothei Sidonii Carmen Astrologicum, ed. D. Pingree, Leipzig, 1976) and, at least in part, by Māšāʾ-Allāh (D. Pingree, “Māshāʾallāh”). Other elements of this form of elections are found in the Apotelesmatica of Hephaestio of Thebes (ed. D. Pingree, Leipzig, 1973, bk. 3, chap. 5, pp. 240-51; cf. also Catalogus V/3, |
pp. 94-96). Hephaestio was read by Theophilus (Ṯawfīl b. Ṯūmā) of Edessa, and introduced by him to Māšāʾ-Allāh (both were at the ʿAbbasid court during the last half of the 8th century). From these Greek sources—Dorotheus and Hephaestio—, as filtered through Māšāʾ-Allāh, elections based on the zodiacal sign occupied by |
the moon became an integral part of astrology as practiced in the Islamic world. Thus, for example, Naṣīr-al-Dīn Ṭūsī came to write in Persian an Eḵtīārāt masīr al-qamar, otherwise known as the Eḵtīārāt-e qamar fī borūj-e eṯnay ʿašar (Storey, II, pp. 54-55). 4. Dorotheus of Sidon initiated a more complex |
method of practicing catarchic astrology in which the astrologer must search for the most propitious moment for undertaking an activity, basing his judgment on the full horoscope of that time. After this form of catarchic astrology reached India in the second century, it was paralleled by the Indian development of |
interrogational astrology (praśnajñāna), in which the judgment concerning an activity was based on the horoscope of the moment at which the question was posed to the astrologer. Both Indian muhūrtaśāstra and praśnajñāna were transmitted to Persia during the Sasanian era, and there blended with the Pahlavi translations ... |
Vettius Valens into an ambiguous science of elections, which was partly catarchic, partly interrogational. To the subject normally addressed by the Greek astrologers, the Indians added military astrology, by which kings and generals may be advised. To the subjects addressed by both Greek and Indian astrologers, the Per... |
astrology, by which both the governors and their potential or actual rivals may be advised (this dangerous aspect of astrology had long been banned in the Roman empire; see Cramer). The Pahlavi books on elections are now all lost, but we know of them through the Greek works of Theophilus |
of Edessa, the Arabic translations of Dorotheus and Valens (Wālīs), the writings attributed to Zoroaster and to Bozorgmehr (q.v.), and the Arabic works of a number of astrologers of Persian background who wrote in the late eighth and ninth centuries, notably Māšāʾ-Allāh, ʿOmar b. Farroḵān Ṭabarī, and Sahl b. Bešr |
(Ketāb al-eḵtīārāt ʿala’l-boyūt al-eṯnay ʿašar). Based on this early Arabic tradition are several treatises written in Persian. None of them has yet been published or studied, so that little more can be done here than to name them. The earliest is a Ketāb-e eḵtīārāt composed at the order of Sultan |
Sanjar Saljūqī (r. 511-52/1117-57; Storey, II, p. 46). In the first decade of the thirteenth century Faḵr-al-Dīn Moḥammad b. ʿOmar Rāzī (d. 606/1209) composed a Ketāb al-eḵtīārāt al-ʿalāʾīya fi’l-eḵtīārātal-samāʾīya for Sultan ʿAlāʾ-al-Dīn Moḥammad Ḵᵛārazmšāh (r. 596-617/1200-20). Rāzī himself later translated this int... |
20 Rajab 663/8 May 1265 or 9 Jomādā I 670/13 December 1271 Naṣīr-al-Dīn Ṭūsī completed, at Marāḡa, a Persian translation of and commentary on the Ketāb al-ṯamara of pseudo-Ptolemy; he had undertaken this work at the request of Bahāʾ-al-Dīn Moḥammad Joveynī (Storey, II, pp. 36-37). Andarz ī Ādurbād īMahraspandān in |
J. M. Jamasp-Asana, ed., The Pahlavi Texts Contained in the Codex MX I, Bombay, 1897. E. A. W. Budge, The Syriac Book of Medicines, 2 vols., London, 1913. Catalogus Codicum Astrologorum Graecorum, 12 vols. in 20 parts, Brussels, 1898-1954. F. H. Cramer, Astrologyin Roman Law and Politics, Philadelphia, 1954. E. |
S. Drower, The Book of theZodiac, London, 1949. T. Fahd, “Ikhtiyārāt” in EI ² III, pp. 1063-64. W. B. Henning, “An Astrological Chapter of the Bundahishn,” JRAS, 1942, pp. 229-48. Imam Jaʿfar al-Ṣādeq, Ketāb eḵtīārāt ayyām al-šahr,ed. and tr. R. Y. Ebied and M. J. L. Young as A Treatise |
on Hemerology Ascribed to Ğaʿfar al-Ṣādiq, Arabica 23, 1976, pp. 296-307. R. Labat, Hémerologies et ménologies d’Assur, Paris, 1939. Idem, Un almanach babylonien (VR 48-49), Paris 1943. D. N. MacKenzie, “Zoroastrian Astrology in the Bundahišn,” BSO(A)S 27, 1964, pp. 511-29. D. Pingree, Jyotiḥśāstra, Wiesbaden, 1981. Id... |
and Latin Astrology,” forthcoming in Arabic Science and Philosophy. E. Reiner, Astral Magic in Babylonia, Philadelphia, 1995. J. Ruska, Arabische Al-chemisten II. Ğaʿfar al-Ṣādiq, der sechste Imām, Heidelberg, 1924, pp. 35-36. Sezgin, GAS VII, pp. 32-38, 49-50, 80-87, 125-28, 324-25. R. C. Zaehner, The Teachings of the... |
Breakthroughs bring the next two major leaps in computing power into sight Breakthroughs might make quantum computing, replacement for silicon practical within a decade One of the best things about covering technology is that you're always on the edge of |
a completely new generation of stuff that will make everything completely different than it ever was before, even before the last generation made everything different. "Completely different" always seems pretty much the same, with a few more complications, higher costs |
and a couple of cool new capabilities, of course. Unless you look back a decade or two and see that everything is completely different from the way it was then… Must be some conceptual myopia that keeps us in happy |
suspense over the future, nostalgic wonder at the past and bored annoyance with the present. The next future to get excited about is going to be really cool, though. You know how long scientists have been working on quantum computers |
that will be incomparably more powerful than the ones we have now because don't have to be built on a "bit" that's either a 1 or a zero? They would use a piece of quantum data called a qubit (or |
qbit, consistent with everything in the quantum world, the spelling wants to be two things at once), that can exist in several states at the same time. That would turn the most basic function in computing from a toggle switch |
to a dial with many settings. Multiply the number of pieces of data in the lowest-level function of the computer and you increase its power logarithmically. Making it happen has been a trick; they've been under development for 20 years |
and probably won't show up for another 10. Teams of Austrian scientists may cut that time down a bit with a system they developed they say can create digital models of quantum-computing systems to make testing and development of both |
theory and manufacturing issues quicker and easier. They did it the same way Lord of the Rings brought Gollum to life: putting a living example in front of cameras and taking detailed pictures they could use to recreate the image |
in any other digital environment. Rather than an actor, the photo subject was a calcium atom, drastically cooled to slow its motion, then manipulated it using lasers, putting it through a set of paces predicted by quantum-mechanical theory, and recorded |
the results. Abstracting those results lets the computer model predict the behavior of almost any other quantum particle or environment, making it possible to use the quantum version of a CAD/CAM system to develop and test new approaches to the |
systems that will actually become quantum computers, according to a paper published in the journal Science by researchers from the University of Innsbruck and the Institute for Quantum Optics and Quantum Information (IQOQI). Far sooner than quantum computers will blow |
our digitized minds, transistors made from grapheme rather than chunkier materials will allow designers to create processors far more dense – and therefore more potentially powerful – than anything theoretically possible using silicon and metallic alloys we rely on now. |
Graphene is a one-atom-thick layer of carbon that offers almost no resistance to electricity flowing through it, but doesn't naturally contain electrons at two energy levels, as silicon does. Silicon transistors flip on or off by shifting electrons from one |
energy level to another. Even silicon doesn't work that way naturally. It has to be "doped" with impurities to change its properties as a semiconductor. For graphene to work the same way, researchers have to add inverters that that mimic |
the dual energy levels of silicon. So far they only work at 320 degrees below zero Fahrenheit (77 degrees Kelvin). Researchers at Purdue's Birck Nanotechnology Center built a version that operates at room temperature, removing the main barrier to graphene |
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