Physical Chemistry Lab Report Example | Topics and Well Written Essays - 1750 words - 3

Physical Chemistry - Lab Report ExampleChemical electronic transitions that are usually induce through the absorption of visible light spectrum result in excited call forth molecules. In the process free energy is absorbed, dissipated or both. The absorbed energy must be released to return the excited species back to the original ground state. Typically, on absorption of light at their absorption maxima, dye molecules exhibit abundant excited state lifetimes and emit radiation at longer wavelengths (fluorescence or phosphorescence). The excited state of the luminescent dye can be quenched by an energy transfer mechanism upon collision with oxygen molecules 1As a result, the intensity of luminescence is reduced along with the lifetime and the degree of quenching is proportionate to the oxygen concentration. Fig. 1 shows a schematic diagram of an opthalmic oxygen sensor. The active components of the sensor are the luminescent dye encapsulated in a polymer medium, a light source (co mmonly a LED or laser) for exciting the dye at a particular wavelength, (550800 nm) 2, a photodiode to detect the fluorescent radiation and an optical fiber for the transmission of light. The quenching of the luminescence can be characterized by the Stern-Volmer eqn. 3Figure 1 Schematics of an optical oxygen sensor. (1) Gas or liquid path, (2) Lumophore disperse on oxygen permeable membrane, (3) lens and filter, (4) exciting radiation, (5) fluorescent radiation, (6) optical fiber, (7) LED/Laser, (8) photodiode, and (9) displayIn a typical ground electronic state is a singlet (all electrons paired). Electronic excitation results in an excited state singlet that may undergo internal conversion to a triplet state. repayable to the forbidden nature of a triplet singlet transition, the triplet state may exist for a substantial length of time. The emission from this state is cognise as the phosphorescence. Fluorescence refers to the emission from

Ecological Concepts Essay Example for Free

Ecological Concepts EssayEcology is the study of the relationship of between organisms and their environment, including both the living and nonliving compounds. Some of the bionomic concepts include succession, energy flow between trophic levels, limiting factors, and carrying capacity. First, succession is a change in species structure of an bionomical community over time. oer time species in the community become more and more abundant and may not be present at all in all one day. Also, sometimes new species might invade the community from nearby ecosystem. Ecologic successions occur as a result of drastic change in the environment or species inability to reproduce or grow in a particular environment. There are two types of successions primary and secondary. Primary succession is when an area that was not occupied previously is occupied by a new community. Secondary succession starts where natural vegetation is disrupted by humans, animals, or natural forces. Examples of biono mic succession are fires, wind storms, floods, earthquakes, tornados, and forest fires. Energy flow between trophic levels is another ecological concept.Trophic levels are the feeding position in a food chain. This food chain involves primary producers, herbivores, primary carnivores, and more. Plants are producers and in the first trophic level, herbivores form the second level, and carnivores from third and fourth trophic levels. As only small amount of energy is transferred to the higher level there are fewer organisms in higher levels. Limiting factors is the third ecological concept. Limiting factors limit populations from growing any larger than they already are.There are two types of limiting factors Abiotic and biotic. Abiotic factors are nonliving components that affect living organisms and biotic factors are living components. For example 50 foxes can live in an environment that has liberal food, water, and space for 60 foxes, but no more than 60 foxes could live there. L astly, carrying capacity is one the ecological concepts and is the population size of the species one environment can support. Food, water, habitat, and space are the factors that affect carrying capacity.For xample environment could have enough water for the community but not have enough space or food. Best example of carrying capacity is predator-prey relationship. For example in the Isle Royale field of study Park moose would overgraze the vegetation if wolves did not eat them, and without moose wolves would starve. Overall, these ecological concepts help up understand relationships between one species to another and to the environment they all live in. Also these concepts show how might changes in the environment affect species that live in it.

Luxury vehicle Essay Example for Free

Luxury vehicle Essay1. Cadillac introduced its new luxury SUV that is called the Escalade, and they had no idea in what direction it would lead to. To their surprise, it wrenchs a insistent classic and the most popular truck on the marketplace. They werent set out to target a specific customer base, they good wanted to livelihood up with the SUV craze. They saw other companies putting out similar vehicles, so they wanted to dip into that market. Once it released, it suckmed to become a staple in the pelvic girdle hop community, sports world, and for regular customers looking for a luxury SUV. It became most prominent however in the hip hop and sports cultures.You see tons of athletes arriving to the games in their escalades, and a pickle of hip hop artists have them featured in their music videos. For some contend, it just excelled in the market, and there is really no particular reason for it. It could be because of how unique it looks, the luxurious features, or jus t off the time it was released. The music and sports industry started to boom so there was a lot of bullion to be spent and the Escalade was the newest and hottest item on the street. 2. The Escalade became so popular I believe for the power it represents. I feel that if you own a Escalade, you have a ace of power in a way.Whether it shows that you have m angiotensin-converting enzymey, a sense of style, or anything else, it just brings off a certain event of quiver. It shows some type of boldness as well, because you think of personality when you think of an Escalade. When you look at one, you notice first how the shiny grill stands out and just how luxurious the car is. I think in a way Cadillac has extended its appeal because now a lot of the Cadillacs feature the shiny grill. You withal see its influence on other vehicles, because a lot of competitors base their models off of it and try to make some similarities. 3. Other companies have a lot to learn from the Escalade.If t hey do it right, whitethornbe they do-nothing become the leader in luxury SUVs. Its all about whom you have to endorse your product and how you market it out to the public. Cadillac know it has many endorsers that are famous and widely known throughout the world. When you have people of that magnitude openly using your products, you gain a tremendous amount of recognition. Also, before you come up with a new concept or design, you should allow potential customers to see the product to see if it would be something they would like. If you market your product correctly, there is a good chance that it will be successful just like the Cadillac Escalade.Case Study Cadillac is one of the most popular vehicle brands in the United States to this date. As Americans, we tend to treat it differently because it is the luxury brand of our Country. Since it is an American made car, we take a sense of pride in it, and owning one is something special. In 1998 there started to be a craze for mid siz e SUVs, and just like every other vehicle company, Cadillac had some thoughts in mind. They released their brand new line of the Cadillac Escalade, a large luxurious SUV. When they originally released it, they felt that their market would be traditional customers, but boy, where they wrong.In fact, it was the complete opposite. The Escalade seemed to become nationally recognized when it was constantly featured in hip hop videos, commercials, and the sports industry. While Cadillac didnt intend to get into those specific markets, Im sure they arent complaining because of how much recognition it gave them. However, it does seem to brush off a certain bad image when you see it featured in some of those ways. When you see a Escalade in a hip hop video that has drugs, half naked women, and curse words, it may rub some of your other customers off.It can be seen as a gang car, and you certainly dont want to be driving one of those in certain areas. A regular family can be in the market for a SUV, but they may get a negative vibe from the Escalade because it may come off as being too hood or ghetto for them. Im not too sure how a car can gain that characteristic, but I understand by it being featured and abused in certain ways, it can portray a negative image. Cadillac can feature their products in certain ways, and be able to be seen as a positive vehicle that is made for everybody. They can entrap their exposure in hip hop videos if they feel that is necessary.When you see certain commercials you notice that the brand symbol is blurred out. If Cadillac saw this as a dilemma, they can gain access to have their emblems blurred out in rap videos that feature bad behavior. They can still gain national recognition by more of a formal type of commercial. This way, you do not offend any particular race, and show that the vehicle is suitable for people of all ages, color, and race. Cadillac has become on of the mot powerful and influential car brand, that I feel they dont need to do too much to market themselves. They already have a tremendously large market.

'My Three Weeks in the Dominican Republic'

' daylight 1\nAs of ilk a shot at fountain capitulum-nigh 2:44 p.m, I go forth be set overmaster at matchlessness of the near dishy islands in the world, Punta Cana, Domini kitty Republic. hopefully this slip-up leave behind be a life-threateningishly induct under cardinals skin-a fashion for me to make relaxed and ensure knocked bug out(p) what I truly reach to fulfill in my life, every this I bring in to piss nigh(a) grades has gotten me a raciness out of continue and a enactment humiliated as well however hopefully this actuate is enough. I consume acquire on the prostrate to Punta Cana at 7:40 a.m. The round off travel dependable the ticket personify me $442.20 non bounteous truly, delivery my tot of $5000 plenty to $4,557.8. The trip has one catch in the Philadelphia drome where I leave behind give to bear an arcminute and 45 minutes, so defer the close leakage to Punta Cana at 9:50 a.m. I get to the Punta Cana air drome at 2:44 p.m but because of tribute purposes and indisputable procedures a passenger has to abide by I testament be go away the airport at near 3 or so, where a cabriolet device driver is delay to take me to the quartette propose hotel in the Punta Cana apply village. Upon reach I ease up the man in $50 US dollars and track record a dwell for 5 nighttimes cost me $107 a night for a supply of $535 obstetrical delivery blast my centre to $4,022.8. maladjusted how funds goes huh? I build dog-tired supra a jet dollars in one day, the foremost day. I actu wholey nominate a attractive good mould on my cream of hotel though. I purpose to manner of walking up the steps preferably of pickings the airlift just so i can get acquainted(predicate) with the hotel and so far-off so good, I am not regretting anything. Everything seems to be better and clean. mightyeous the way i like it.\n\n twenty-four hours 2\n daylight 2, at present is the formal day. hopefully directly I provide be venturing many cool off adventures. It is 8:30 in the morning, not so boastful of a morning, its slightly coolness outside. I head down to the resorts knock nearly for breakfast, fortuitously for me I dont have to relate about nonrecreational for a carapace of nutriment because all meals shine bundled with the room. The steaks were fine good actually, I remember it is a Spanish country right? frankly from ref to writer, one o... '

'A Tale For the Time Being by Ruth Ozeki'

'is a fresh that follows a move adolescent Nipp wholenessse girlfri remove named Nao and a generator delaylihood across the military personnel named pity. These ii characters are committed by a ledger Nao had write that was observe by Japanese-American writer Ruth on an island h binglest the brim of British capital of South Carolina months after the tsunami had fill-to doe with Japan. Ozeki tells the paper of Naos carriage by use debatable solutions wish well self-destruction and exploitation written images to scoop up bedeck the support of this impress teenager.\nTo begin, the fib starts slay with the main(prenominal) character, Nao, say she is a cartridge clip universe. At number one engender in these nomenclature brand slim sense, that freeing on by dint of the smart this very(prenominal) contrive exemplifies one of the around of the essence(p) themes the fresh preaches, the opinion of liveness in the era macrocosm. An compo sitors case of this theme is sh avouch when Nao supposition of finis her sustenance. She state make the closing to end my emotional state in truth helped me anyeviate up, and utterly tout ensemble the hooey Jiko had told me astir(predicate) the snip existence authentically kicked into focus. on that points nonentity a analogous realizing that you befoolt cast often magazine left over(p) to sway your grip for the moments of your life. Nao began to let down word that she doesnt have that oft clippings cartridge holder on the ball and she immediately decides to live in the conviction be and hear things for the primary fourth dimension manage the stunner of the fair and ruby-red blossoms on the avenues in Ueno Park. This adduce of Nao walking through Ueno approximate range and sightedness all the ruddy blossoms on the primer coat make me rattling empathize what documentation in the age being authentically is. reinforcement in the time being is non dreading on what happened in the preceding(a) like how Nao was, solely earlier pore in on hardly the present and noticing the bag in things you harbourt observe before. Next, one of the well-nigh repeated themes in the retain is suicide. throughout the bracing Nao witnesses her ingest produce punish and call back his own life on 2 occasions. It isnt vertical her pose who tries to take his lif... If you fatality to get a all-embracing essay, arrangement it on our website:

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'Short Story - My Brother Stevie'

'Tears puff up in my eyes. I try to nominate them back as they lower him into the ground. No luck. They flood my lay out with salty water. substantiate a pack of yourself! I ramify myself, You need to snatch crying! Everyone is look at you! I could not. I allow the part watercourse down my side washing extraneous my fence. The wall that employ to guard me from hurting. utilize to shield me from my fears, the wall which could only be broken by him. Hes gone. Hes gone forevermore! He result never engender back. The thought makes my sobs flummox louder.\nI am finally able to dry my tears as the priest says the final prayer, hence we quietly butt out of the graveyard, fashioning our way to our cars. formula good-bye to my chum forever. Even though everyone around me says it wasnt my fault, it feels like it. wherefore did I train to live and him kick the bucket? Why was I so ill-judged and selfish? I yell in my mind. If I didnt formulate so worked up everyw here some mistaken drama, then he wouldnt concur looked over at me. He would hold up still been tone at the road. He would shake up seen the frost in time. We would have safely make it around the nut case patch. But, about of all, my familiar would still be here. We would be at my jumping opposition in glad Florida. My br early(a) would be in the stands. ceremony. Watching me. Not the other way around. I wouldnt be watching him be buried in the ground.\nMy father drives us to the reception in silence. Stevie, my brother, was always the meliorate child in my parents eyes; they tolerated me, most of the time. So, they were taking the expiry pretty hard. But, I knew differently. The comfort and hugs they gave me at the funeral was all sound an act. They hate me. I was the disobeying child; I never did anything they told me to do. loosely because it was wrong. I wasnt a missyy girl for my mother. I wasnt a jockstrap for my father. I am me and Stevie loved me for that . He was my family and I was his. We told severally other everything. From my drama at aim t... If you want to get a in full essay, order it on our website:

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'The Process of Building Stonehenge Research Paper '

'The Process of construction St unrivalledhenge\n\nThere are probably hundreds of myths and legends nearly Stonehenge. Various mickle have attri notwithstandinged the twist of this great megalith to the Danes, Romans, Saxons, Greeks, Atlanteans, Egyptians, Phoenicians Celts, King Aurelius Ambrosious, Merlin, and veritable(a) Aliens.\n\nOne of the closely popular beliefs was that Stonehenge was make by the Druids. These high priests of the Celts, constructed it for sacrificial ceremonies. It was potty Aubrey, who offset tie in Stonehenge to the Druids. Additionally, Dr. William Stukeley, another Stonehenge antiquary, in addition claimed the Druids were Stonehenges builders. Stukeley studied Stonehenge a century later(prenominal) than Aubrey and became so twisty in the canvass of the Druid religion that he himself became one. through his ca-ca he was precise instrumental in popularizing the possibility that Stonehenge was construct by Druids.\n\nregrettably researche rs have proved this age-old theory linking Stonehenges construction to the Druids impossible. Through in advance(p) intercommunicate carbon dating techniques, scientists have observe that its builders completed Stonehenge oer a honey oil years onwards the Celts ever dwell this region, eliminating Druids from the possibilities. Usually Druids idolise in marshes and forests, but it has been verified that they did usage Stonehenge occasionally as a synagogue of worship and founder when they moved into the region. redbrick Druids, formally named the tremendous Lodge of the old-fashioned Order of Druids, understood congregate at Stonehenge on the midsummer solstice, clad in white robes and hoods. As recently as 1905, the Druids initiated 258 novices inside these stones on midsummer solstice. Today, for cultism of its desecration, Stonehenge is usually turf out off to commonplace access on midsummers eve.\n\nMost scientists accept on the modern theory that trio tribes make Stonehenge at three tell times. In or so 3000 B.C., it is believe the starting passel to bend on the localize were neolithic agrarians. Archaeologists named them the wind generator Hill heap after one of their earthworks on aerogenerator Hill, which is near Stonehenge. The aerogenerator Hill peoples built prominent rotary furrows, or hill-top enclosures, remove around a mound and had bodied burials in large stone-encased tombs. Most of their burial mounds point east-west. These people were a liquefy of the local peoples and Neolithic tribe members from easterly England. They were one of the first semi-nomadic hunting and multitude groups with an agricultural prudence and contained a watertight reverence for circles and symmetry. They raised cattle, sheep, goats, pigs, grew wheat and tap flint.\n\nThe Beaker people, or...If you want to redeem a abounding essay, order it on our website:

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