Platinum Resistance Thermometer

Platinum Resistance Thermometer Platinum Resistance Thermometer How it works: The simplest resistance thermometer configuration uses two wires. It is only used when high accuracy is not required as the resistance of the connecting wires is always included with that of the sensor leading to errors in the signal. Using this configuration you will be able to use 100 meters of cable. This applies equally to balanced bridge and fixed bridge system. Temperature range: Operating Range -200  °C to 1200  °C Advantage: It has a wide range and is very accurate. It is best for small steady temperatures. Disadvantages: Unsuitable for rapidly changing temperature. Slow to respond. Optical Pyrometer How it works: A pyrometer has an optical system and detector. The optical system focuses thermal radiation onto the detector. The output signal of the detector (Temperature T) is related to the thermal radiation or irradiance of the target object through the Stefan-Boltzmann law, the constant of proportionality, called the Stefan-Boltzmann constant and the emissivity of the object. This output is used to infer the objects temperature. Thus, there is no need for direct contact between the pyrometer and the object, as there is with thermocouple and Resistance temperature detector (RTDs). Uses: The optical pyrometer is widely employed for accurate measurement of the temperature of furnaces, molten metals and other heated materials. It is primarily used in the range of 1000 to 50008F. Most optical pyrometers are manually operated and thereby are somewhat limited in their application. Pyrometers are suited especially to the measurement of moving objects or any surfaces that cannot be reached or cannot be touched. Temperature range: Optical Pyrometers with a range of 700C 1250C have an accuracy better than  ± 58C while those having a range of 1100 -1900 have an accuracy better than  ±108C. Temperature ranges can be measured between approximately 1,300 to 5,800oF (700 to 3,200oC), and with appropriate filters, the disappearing-filament pyrometer temperature ranges can be ex-tended to approximately 18,000oF (10,000oC). Advantages: Measures high temperatures. Thermocouple How it works: It consists of two dissimilar metals, joined together at one end, which produce a small unique voltage at a given temperature. This voltage is measured and interpreted by a thermocouple thermometer. Uses: A thermocouple is a sensor for measuring temperature. However, thermocouples have a wide temperature range (-200 to 2000  °C) and are often needed simply because alternative devices do not operate at the desired temperature. In addition, they are relatively low-cost and versatile. Temperature range: Operating Range -200  °C to 2000  °C Advantages: Wide range, robust and compact and good for rapidly changing temperatures. Disadvantage: For good quality a milli voltmeter is needed. When to use RTDs or thermocouples The two most common ways of measuring industrial temperatures are with resistance temperature detectors (RTDs) and thermocouples. But when should control engineers use a Thermocouple and when should they use an RTD? The answer is usually determined by four factors: Factors: Temperature, time, size, and overall accuracy requirements. If process temperatures fall from -328 to 932 °F (-200 to 500 °C), then an industrial RTD is the preferred option. Thermocouples have a range of -180  °C to 1300  °C (-300 to 2300  °F) so for extremely high temperatures they are the only contact temperature measurement choice. If the process requires a very fast response to temperature changes-fractions of a second as opposed to seconds (i.e. 2.5 to 10 s)-then a thermocouple is the best choice. Keep in mind that time response is measured by immersing the sensor in water moving at 1 m/s (3 ft/s) with a 63.2% step change. A standard RTD sheath is 3.175 to 6.35mm (0.125 to 0.25 in.) in diameter, while sheath diameters for thermocouples can be less than 1.6mm (0.062 in.). If the process only requires a tolerance of 2  °C or greater, then a thermocouple is appropriate. If the process needs less than 2  °C tolerance, then an RTD is sometimes the only choice. Keep in mind, unlike RTDs that can maintain stability for many years, thermocouples can drift within the first few hours of use.

Deception Point Page 34

Tolland looked only partially comforted, his relief apparently clouded by a deeper mystery. â€Å"I can't be for sure without a microscope,† Tolland said, â€Å"but it looks to me like this is a bioluminescent plankton from the phylum Pyrrophyta. Its name means fire plant. The Arctic Ocean is filled with it.† Corky shrugged. â€Å"So why'd you ask if they were from space?† â€Å"Because,† Tolland said, â€Å"the meteorite was buried in glacial ice-fresh water from snowfalls. The water in that hole is glacial melt and has been frozen for three centuries. How could ocean creatures get in there?† Tolland's point brought a long silence. Rachel stood at the edge of the pool and tried to get her mind around what she was looking at. Bioluminescent plankton in the extraction shaft. What does it mean? â€Å"There's got to be a crack somewhere down there,† Tolland said. â€Å"It's the only explanation. The plankton must have entered the shaft through a fissure in the ice that allowed ocean water to seep in.† Rachel didn't understand. â€Å"Seep in? From where?† She recalled her long IceRover ride in from the ocean. â€Å"The coast is a good two miles from here.† Both Corky and Tolland gave Rachel an odd look. â€Å"Actually,† Corky said, â€Å"the ocean is directly underneath us. This slab of ice is floating.† Rachel stared at the two men, feeling utterly perplexed. â€Å"Floating? But†¦ we're on a glacier.† â€Å"Yes, we're on a glacier,† Tolland said, â€Å"but we're not over land. Glaciers sometimes flow off a landmass and fan out over water. Because ice is lighter than water, the glacier simply continues to flow, floating out over the ocean like an enormous ice raft. That's the definition of an ice shelf†¦ the floating section of a glacier.† He paused. â€Å"We're actually almost a mile out to sea at the moment.† Shocked, Rachel instantly became wary. As she adjusted her mental picture of her surroundings, the thought of standing over the Arctic Ocean brought with it a sense of fear. Tolland seemed to sense her uneasiness. He stamped his foot reassuringly on the ice. â€Å"Don't worry. This ice is three hundred feet thick, with two hundred of those feet floating below the water like an ice cube in a glass. Makes the shelf very stable. You could build a skyscraper on this thing.† Rachel gave a wan nod, not entirely convinced. The misgivings aside, she now understood Tolland's theory about the origins of the plankton. He thinks there's a crack that goes all the way down to the ocean, allowing plankton to come up through it into the hole. It was feasible, Rachel decided, and yet it involved a paradox that bothered her. Norah Mangor had been very clear about the integrity of the glacier, having drilled dozens of test cores to confirm its solidity. Rachel looked at Tolland. â€Å"I thought the glacier's perfection was the cornerstone of all the strata-dating records. Didn't Dr. Mangor say the glacier had no cracks or fissures?† Corky frowned. â€Å"Looks like the ice queen muffed it.† Don't say that too loudly, Rachel thought, or you'll get an ice pick in the back. Tolland stroked his chin as he watched the phosphorescing creatures. â€Å"There's literally no other explanation. There must be a crack. The weight of the ice shelf on top of the ocean must be pushing plankton-rich sea-water up into the hole.† One hell of a crack, Rachel thought. If the ice here was three hundred feet thick and the hole was two hundred feet deep, then this hypothetical crack had to pass through a hundred feet of solid ice. Norah Mangor's test cores showed no cracks. â€Å"Do me a favor,† Tolland said to Corky. â€Å"Go find Norah. Let's hope to God she knows something about this glacier that she's not telling us. And find Ming, too, maybe he can tell us what these little glow-beasties are.† Corky headed off. â€Å"Better hurry,† Tolland called after him, glancing back into the hole. â€Å"I could swear this bioluminescence is fading.† Rachel looked at the hole. Sure enough, the green was not so brilliant now. Tolland removed his parka and lay down on the ice next to the hole. Rachel watched, confused. â€Å"Mike?† â€Å"I want to find out if there's any saltwater flowing in.† â€Å"By lying on the ice without a coat?† â€Å"Yup.† Tolland crawled on his belly to the edge of the hole. Holding one sleeve of the coat over the edge, he let the other sleeve dangle down the shaft until the cuff skimmed the water. â€Å"This is a highly accurate salinity test used by world-class oceanographers. It's called ‘licking a wet jacket.'† Out on the ice shelf, Delta-One struggled with the controls, trying to keep the damaged microbot in flight over the group now assembled around the excavation pit. From the sounds of the conversation beneath, he knew things were unraveling fast. â€Å"Call the controller,† he said. â€Å"We've got a serious problem.† 40 Gabrielle Ashe had taken the White House public tour many times in her youth, secretly dreaming of someday working inside the presidential mansion and becoming part of the elite team that charted the country's future. At the moment, however, she would have preferred to be anywhere else in the world. As the Secret Serviceman from the East Gate led Gabrielle into an ornate foyer, she wondered what in the world her anonymous informant was trying to prove. Inviting Gabrielle into the White House was insane. What if I'm seen? Gabrielle had become quite visible lately in the media as Senator Sexton's right-hand aide. Certainly someone would recognize her. â€Å"Ms. Ashe?† Gabrielle looked up. A kind-faced sentry in the foyer gave her a welcoming smile. â€Å"Look over there, please.† He pointed. Gabrielle looked where he was pointing and was blinded by a flashbulb. â€Å"Thank you, ma'am.† The sentry led her to a desk and handed her a pen. â€Å"Please sign the entry log.† He pushed a heavy leather binder in front of her. Gabrielle looked at the log. The page before her was blank. She recalled hearing once that all White House visitors sign on their own blank page to preserve the privacy of their visit. She signed her name. So much for a secret meeting. Gabrielle walked through a metal detector, and was then given a cursory pat down. The sentry smiled. â€Å"Enjoy your visit, Ms. Ashe.† Gabrielle followed the Secret Serviceman fifty feet down a tiled hallway to a second security desk. Here, another sentry was assembling a guest pass that was just rolling out of a lamination machine. He punched a hole in it, affixed a neck cord, and slipped it over Gabrielle's head. The plastic was still warm. The photo on the ID was the snapshot they had taken fifteen seconds earlier down the hall. Gabrielle was impressed. Who says government is inefficient? They continued, the Secret Serviceman leading her deeper into the White House complex. Gabrielle was feeling more uneasy with every step. Whoever had extended the mysterious invitation certainly was not concerned about keeping the meeting private. Gabrielle had been issued an official pass, signed the guest log, and was now being marched in plain view through the first floor of the White House where public tours were gathered. â€Å"And this is the China Room,† a tour guide was saying to a group of tourists, â€Å"home of Nancy Reagan's $952 per setting red-rimmed china that sparked a debate over conspicuous consumption back in 1981.† The Secret Serviceman led Gabrielle past the tour toward a huge marble staircase, where another tour was ascending. â€Å"You are about to enter the thirty-two-hundred-square-foot East Room,† the guide was narrating, â€Å"where Abigail Adams once hung John Adams's laundry. Then we will pass to the Red Room, where Dolley Madison liquored up visiting heads of state before James Madison negotiated with them.†

Macbeth Motifs Essay

When it comes down to it, humans are mammals, and there are some animalistic traits that every mammal shares. The story of Macbeth by Shakespeare includes a theme that is the epitome of a trait that all mammals share, weak versus strong. Through the use of metaphors including birds, the symbolism of Macbeth as an owl throughout the story, and the juxtaposition between birds, weak versus strong is represented by the motif of birds in Macbeth. Birds are incorporated into other literary elements that Shakespeare utilizes, showing the true depth of his writing. Metaphors allow the reader to paint a picture of written words referencing images that they are familiar with. Like any other animal, there is a hierarchy of strength and therefore power for birds. The metaphors that Shakespeare incorporates into Macbeth including birds allow the reader to reference their experience with strong birds fighting to create an image of what the humans in the story might have been fighting like. A captain describes how valiantly Macbeth fought in the battles in the beginning of the story, saying that he was â€Å"as sparrows eagles†, which paints a picture of a valiant and strong eagle fighting a small, meek sparrow (1.2.35-42). However, later in the story, when Macbeth’s position shifts and he is no longer perceived as a noble soldier but rather as a tyrannical ruler preying on those he controls, birds are used in a metaphor again to illustrate a changed image of Macbeth. â€Å"A falcon, tow’ring in her pride of place,† representing honor and innocence, â€Å"was by a mousing owl hawked at and killed,† illustrating an evil bird using its strength to overpower and kill an innocent bird (2.4.11-14).Sometimes, a reader does not glean the true meaning of an object in a story until after it has been illustrated throughout the entirety of the work of literature. Throughout the uses of birds in Macbeth, including the imagery and metaphors, a pattern occurs where a powerful owl is preying on weaker birds, and by the end of the story the reader comes to realize that the owl is a representation of Macbeth and the acts he is committing. The owl referenced during the murder of Duncan, is described as an â€Å"obscure bird† that â€Å"clamored the livelong night† as he â€Å"heard i’ th’ air, strange screams of death† (2.3.49-56). The owl in this scene is a symbol for Macbeth discovering what he is capable of, and what new powers he receives when he utilizes his newfound strength against others. One example of how he uses his recent strength was when he decided to have everyone in Macduff’s castle unnecessarily murdered. In this scene Lady Macduff is expressing her anger toward her husband, but also reveals characteristics of Macbeth when she states that her husband is not equal to â€Å"the most diminutive of birds,† which â€Å"will fight, her young ones in her nest, against the owl† (4.2.6-14). Macbeth being represented by the owl in this context depicts him as a villain that is so hungry for control that he will go to such extremes as to attack a weak, defenseless bird and it’s young. Sometimes it is equally as important to illustrate the weak side of a relationship as the strong side because then the contrast between the weak and the strong is magnified for the reader. In Macbeth, Shakespeare utilizes this juxtaposition to make the theme of strong versus weak even more apparent by inserting some descriptions of birds that appear weak to make the acts done by the stronger birds even more horrific. The day before Duncan’s murder where a powerful, evil owl was present, Banquo and Duncan comment on the sweet, innocent birds at Macbeth’s castle, â€Å"this guest of summer, the temple-haunting martlet, does approve†¦that the heaven’s breath smells wooingly here† this illustrates their vulnerability and unawareness to the upcoming strike by Macbeth, making his actions seem even worse. When Lady Macduff tells her son that â€Å"thou’dst never fear the net nor lime, the pitfall nor the gin,† he responds with a question of why he should because â€Å"poor birds they are not set for†, meaning that because he would be such a weak bird, hunters would have no want for him (4.2.36-37). Just after making this point, the defenseless son of Macduff is murdered by the king Macbeth, making the reader question what kind of tyrant Macbeth has come to be. The use of birds in Macbeth by Shakespeare is used to develop the theme of weak versus strong when they are used in metaphors, when Macbeth is represented by a bird throughout the story, and by the juxtaposition of the weak and strong birds. The acts committed by the characters aroused emotions in the audience because they were not so unrealistic that the audience could not relate to them, they represented the mammal in humans, the animal inside of all of us that we attempt to constrain. Birds are essential to create this unsettling feeling because their rustic, animal-like nature is no unlike the animalistic traits we try to hide, which allows the reader or audience to relate with the motif.

Compare And Contrast Locke And Hobbes State Of Nature

In the following essay I will compare Hobbes’ account of the State of Nature, as depicted in his Leviathan, with Locke’s State of Nature put forward in his Second Treatise on Civil Government. Regarding the main differences, I will discuss how, for Hobbes, it is a state of war in which man is self-interested, and a government is required to oppose human nature. He concluded that there is no justice in nature, and notions of right and are wrong are mere social phenomena. Locke, on the other hand sees it as a state of equality, where man is fundamentally good. The need for Government is a need for human nature to be maintained, and there is a universal right to punish, which comes in three forms and allows for justice without war. I will†¦show more content†¦Locke is known for his appeal to reason, and see this as the way forward for harmony in state of nature, being equally able to regulate ourselves since reason teach us man â€Å"has not liberty to destroy hi mself, or so much as any creature in his possession, but where some nobler use than its bare preservation calls for it† . A glaringly obvious difference arises thus far then; anarchy for Hobbes is such that due to the constant danger of others attacking you and taking yours for their own, there is a constant state of aggression towards one another. Man is essentially self-interested and thinks only of increasing his possession and pleasures, behaving not out of reason but out of passion. For Locke, man has an unassailable moral compass that prevents him from doing what is wrong, and we know what is wrong from being made in God’s image. The two philosophers, therefore, understandably have very different ideas of justice in a state of nature. With no inviolable morality to speak of, acting purely from passion, man cannot draw upon it to settle disagreement or quarrel in a Hobbesian world. We require someone to enforce a justice system upon us, and to agree upon the statutes of that system. Otherwise, â€Å"where there is no common power, there is no law; where no law, no injustice. Force and fraud are inShow MoreRelatedCompare and Contrast the Views of the State of Nature Held by Hobbes and Locke.2718 Words   |  11 Pagesdefining the meaning of A State of Nature. As the likes of Hobbes, Rousseau and Locke wrote about it, it means man when he was natural in his state of nature, uninfluenced by society, and the temptations of today. There are no rights in a state of nature, only freedom to do as one wishes. It is a term used to illustrate the theoretical condition of civilization before the states foundation in Soc ial Contract Theories. 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