Anti-Matter Essays (1208 words) - Antimatter, Elementary Particles

Anti-Matter Ordinary matter has negatively charged electrons circling a positively charged nuclei. Anti-matter however has positively charged electrons - positrons - orbiting a nuclei with a negative charge - anti-protons. Only anti-protons and positrons are able to be produced at this time, but scientists in Switzerland have begun a series of experiments which they believe will lead to the creation of the first anti-matter element -- Anti-Hydrogen. (Encarta 99) The Research Early scientists often made two mistakes about anti-matter. Some thought it had a negative mass, and would thus feel gravity as a push rather than a pull. If this were so, the antiproton's negative mass/energy would cancel the proton's when they met and nothing would remain; in reality, two extremely high-energy gamma photons are produced. Today's theories of the universe say that there is no such thing as a negative mass. (Encarta 99) The second and more subtle mistake is the idea that anti-water would only annihilate with ordinary water, and could safety be kept in (say) an iron container. This is not so: it is the subatomic particles that react so destructively, and their arrangement makes no difference. Scientists at CERN in Geneva are working on a device called the LEAR (low energy anti-proton ring) they are attempting to slow the velocity of the anti-protons to a billionth of their normal speeds. The slowing of the anti-protons and positrons, which normally travel at a velocity near the speed of light, is necessary so that they have a chance of meeting and combining into anti-hydrogen. The problems with research in the field of anti-matter is that when the anti-matter elements touch matter elements they annihilate each other. The total combined mass of both elements are released in a spectacular blast of energy. Electrons and positrons come together and vanish into high-energy gamma rays (along with a certain number of harmless neutrinos, which pass through whole planets without effect). Hitting ordinary matter, 1 kg of anti-matter explodes with the force of up to 43 million tons of TNT - as though several thousand Hiroshima bombs were detonated at once. (Encarta 99) So how can anti-matter be stored? Outer space seems the only place, both for storage and for large-scale production. On Earth, gravity will sooner or later pull any anti-matter into disastrous contact with matter. Anti-matter has the opposite effect of gravity on it, the anti-matter is 'pushed away' by the gravitational force due to its opposite nature to that of matter. A way around the gravity problem appears at CERN, where fast moving anti-protons can be held in a'storage ring' around which they constantly move - and kept away from the walls of the vacuum chamber - by magnetic fields. However, this only works for charged particles, it does not work for anti-neutrons, for example. The Unanswerable Question Though anti-matter can be slowly manufactured, natural anti-matter has never been found. In theory, we should expect equal amounts of matter and anti-matter to be formed at the beginning of the universe - perhaps some far off galaxies are the made of anti-matter that somehow became separated from matter long ago. A problem with the theory is that cosmic rays that reach Earth from far-off parts are often made up of protons or even nuclei, never of anti-protons or antinuclei. There may be no natural anti-matter anywhere. In that case, what happened to it? The most obvious answer is that, as predicted by theory, all the matter and anti-matter underwent mutual annihilation in the first seconds of creation; but why there do we still have matter? It seems unlikely that more matter than anti-matter should be formed. In this scenario, the matter would have to exceed the anti-matter by one part in 1000 million. An alternative theory is produced by the physicist M. Goldhaber in 1956, is that the universe divided into two parts after its formation : the universe that we live in, and an alternate universe of anti-matter that cannot be observed by us. (Encarta 99) The Chemistry Though they have no charge, anti-neutrons differ from neutrons in having opposite 'spin' and 'baryon number'. All heavy particles, like protons or neutrons, are called baryons. A firm rule is that the total baryon number cannot change, though this apparently fails inside black holes. A neutron (baryon number +1) can become a proton (baryon number +1) and an electron (baryon number 0 since an electron is not a baryon but a light particle). The total electric charge stays at zero and the total baryon number at +1. But a proton

Locations as Metaphors in The Great Gatsby essays

Locations as Metaphors in The Great Gatsby essays F. Scott's Fitzgerald's novel The Great Gatsby often uses locations as metaphors for the qualities of the characters and for the themes of the novel. This occurs with West Egg and East Egg, where the distance between the two sides represents Gatsby's distance from Daisy, his longing for his dream, and the fact that the dream may not be attainable. West Egg and East Egg also represent the differences in the characters of Gatsby and Daisy, especially communicating that Gatsby's attempts to reinvent himself can only take him so far. The valley of ashes is also important because it contributes to the theme of the novel by showing the result of wealth. The all-seeing eyes of the billboard looking over the valley of ashes also represents that the characters cannot escape judgement. These metaphors all contribute to the theme of how money is not the solution to life, but The first metaphor occurs with West Egg and East Egg, two egg-shaped islands lying opposite each other and separated by a bay. West Egg is the island where Gatsby lives and also the less fashionable of the two islands. While West Egg is less fashionable, it is also the more real of the two islands. This includes that it is the island where the narrator Nick lives in a small rented bungalow. West Egg still has its share of mansions but there is also a sense of reality to the place. In contrast, East Egg is all mansions, with the sense of elite making it the least real of the two islands. The first reason this location is relevant is because it represents Gatsby's physical separation from Daisy and his longing for her. Gatsby lives on West Egg and Daisy lives on East Egg. This makes Gatsby quite close to her, yet he remains separated by the body of water. His longing is captured by the way he gazes across the bay at the green light "that burns all night at the end of your dock" (Fitzgerald 94). Nick ...

Popular Culture Essay Example | Topics and Well Written Essays - 1500 words

Popular Culture - Essay Example In most cases, popular culture is used to refer to the cultures of low class citizens as opposed to the official culture of the high in the society. TV shows and other forms of mass media are often used to depict how people in a certain society are expected to behave (Ashby, 2010). Grey’s Anatomy is about the lives of surgical interns who are residents of a fictional hospital known as Seattle Grace Mercy West Hospital. The series shows the interns as they evolve into experienced doctors under the care of their more experienced mentors. Although the show revolves around the everyday lives of the doctors, it is worth noting that much emphasis is put on their personal lives as opposed to their professional sides. A typical day starts with the interns arguing about who should take care of a certain patient. This ends after the intervention of a hospital superior who is charged with the responsibility of assigning duties to the interns. The main theme of the series is the interacti ons that take place between patients and the doctors as well co-workers (Rhimes, 2005). On the other hand, Family Guy is about the adventures faced by Peter Griffin’s family. Griffin is an American- Irish catholic, a blue-collar worker and has a well-known Rhode Island. In addition, he speaks with a deep Eastern Massachusetts accent. His wife is known as Lois, a homemaker who plays piano. The two have three children, a teenage daughter by the name of Meg. Chris is their teenage and overweight son who resembles his father in several ways. Stewie is the youngest son but he has adult mannerisms. In addition, they have a dog by the name of Brian, who has anthropomorphic characteristics and can engage in human conversations as well as drink martinis (MacFarlane, 1998). Similarities The two TV series are based on relationships between people in a family setting and among friends. Although Family Guy focuses on the lives of the Griffin family, it is of paramount importance to note t hat the relationship between the family and their neighbors is highly explored (MacFarlane, 1998). In Grey’s Anatomy, the resident interns are like a family because they have to stay together until they done with their internship (Rhimes, 2005). Relationships are not easy in the two series because of the differences that exist between the characters. The interns are always arguing about the patient one will attend to and this is evident when Griffin is not happy with the paraplegic police officer, Joe Swanson. This happens despite the fact that Swanson has not done anything wrong to the Griffin’s family, but he is told that he is unwelcome in their restaurant. In addition, family feuds are evident as seen in the way the Griffin’s treat Meg. This is because they believe that she is timid and unable to fit in school. Although Stewie is the youngest, he is considered more intelligent than his elder siblings. Moreover, Brian, the dog is held in high esteem than Meg and Chris despite the fact that the latter resembles his father in several aspects (MacFarlane, 1998). Just as the hospital superiors are the heads of the interns in the hospital, Griffin is the head of his family. The superiors make most of the decisions irrespective of what the interns want. Whenever they find the interns arguing about patients, they do not take time to consult the interns before coming up with a solution (Rhimes, 2005). On the same note, ideas from Meg and Chris are not welcome to the family because

Ghana Letters Essay Example | Topics and Well Written Essays - 2000 words

Ghana Letters - Essay Example The philosophy of this political party, as my cousin explained to me, was close to my ideas: independence from Ghana and social justice but with a dynamic form of resistance. In other words, it would be a nationalist party influenced from the ideas of socialism. I was really pleased to hear that and I stated my interest. In a few days, the 10th of June, I was present in the party’s establishment, being one of its founding members. Through the years, I tried to participate in as many meetings of the party as possible, supporting social activities, writing documents and organizing events. Through these public meetings local people had the chance to be informed on the progress of the country’s independency and on the party’s schedule for securing economic growth. Also, emphasis was given to the protection and enhancement of Ghana’s cultural and social identity. Because I have to respond also to my duties as a teacher my involvement in the party’s activities could not exceed the two-three hours on a daily basis. For years, my life was dedicated to inform people on Ghana’s potentials, as a nation, on the history of Ashanti, a population that has suffered a lot from colonialists and from the chances of Ghana to recover from economic devastation, as a result of its long-term occupation from colonialists. The power of Ghana’s culture and tradition had been significant help; G hanaians, being independent by nature, were willing to risk their live for securing the freedom and happiness of their children. All these efforts were terminated unexpectedly. It was the morning of 24 February of 1966 that police officers entered my apartment and arrested me. I had to pass a few years in jail, without specific category but just because of my participation in a political party. My participation in CPP offered to me valuable memories but also an important feeling: I know that I’ve done everything possible for helping my country to escape colonialism and to become

Companies entering into contract Case Study Example | Topics and Well Written Essays - 750 words

Companies entering into contract - Case Study Example Right before signing the contract, there was no proper consultation by the client for proper requirements of the project; this was the first cause of the failure. Also contributing to the failure were the poor mechanisms to track the progress of the project by both parties. Furthermore, there was no clause to cater for arising issues and amendment of the contract. This resulted in lack of proper measures to solve many issues that were arising, leading to eventual failure of the project. Before signing contracts, there should be thorough consultations between concerned parties to avoid making errors that may result in losses to the companies involved. All employees should know the laws guiding professional ethical and ensure that they honor them for their own benefit, as well as that of the company as a whole. Keywords: Contract, Guilt, Agreement, Sign, Project, Measures, Consultation, Client, Developer Legal Directions that the Involved Parties should have Adopted The failures that h ave been associated with this contract provide enough evidence that the agreement between the software developer and the client company was incomplete. The various evidences of inappropriate conduct by either party symbolize the lapse in honoring the contract. There were also a lot of gaps left during the initial formulation of the contract, which encouraged the misconduct. It is important to define users’ requirements during the signing of contract. Right from the onset, the client should have involved the IT department in the process of issuing out the contract, since the product that was to be developed falls under their area of specialization; therefore they understand the requirements better. For example, the IT department could have challenged the vendors on various issues relating to the software that was to be developed, and were best suited to probe the developers on all matters relating to the operation of the software. Another failure caused by the client is the fa ilure to involve operational performance in the contract; this should have been the main aim of the software. This is because the contract was too open. Each party failed to know the real role of the software. In particular, any payment should be based on the performance of the item, and the various stages of payment should go hand in hand with functionality of the project. To handle this well, the contract should involve a clause to demand the vendor to provide the software design, so it could act as a guideline during each phase of the software development. Action taken towards the Two External Contractors Following the unlawful conduct of the employees whose employment was contract based, the company should have taken stern disciplinary action, because their conduct led to loss of confidence on the company by the client. This happened soon after the two contracted employees met with the client. Though it may not be clear what they discussed, actions speak louder than words. The c lient company pulled out of the contract and as a result, Dag Brucken (DB) incurred a lot of losses, including the loss of time and finances invested in the project. The greatest offence that these two employees are held liable for is revealing a company’s secret, whose result was loses to the company. Legal action that could be taken against them includes being taken to a court of law, so that they would face prosecution in reference to employee’s code of conduct and mode of conduct; their conduct was in contrast to the company’s policies. Ethical actions comprise the termination of their employment, and subsequent charges made upon them to repay the losses incurred by the company, due to their gross misconduct. DB Company

Pluto and its Satellites from the New Horizons Spacecraft

Pluto and its Satellites from the New Horizons Spacecraft CAROLINE MOORE AbstractThe New Horizons spacecraft has provided the first close-up study of Pluto and its satellites. Much more analysis is required of the data but the early findings have revolutionised our understanding of the Pluto system. Discoveries such as the complexity of Plutos surface, the current geological activity, the atmospheric hazes, lower-than-predicted escape rate and the largest known glacier in the solar system were completely unexpected. Plutos moon Charon has surprised with its dark red polar cap and tectonic belt and data from the smaller moons supports the hypothesis that they were formed out of the remnants from the collision that formed the Pluto-Charon binary. Introduction Since its discovery in 1930, with a semi-major axis of 39.5AU, Pluto has been considered an icy oddity. Beyond the realm of the gas giants, Pluto did not fit into any known solar system architecture until 1992 when the existence of the Kuiper Belt (30-50AU from the Sun) was confirmed by the discovery of the first Kuiper Belt object (KBO). Now more than 1,000 KBOs have been identified, including five dwarf planets, and it is estimated that more than 100,000 objects larger than 100km orbit the sun within the belt. Its believed that the Kuiper Belt contains leftover remnants from the beginning of the solar system and that sending the New Horizons mission to explore Pluto, its moons and other KBOs would provide valuable insights into the formation of the solar system. The fastest spacecraft ever launched, New Horizons started its mission on 19 January 2006 and flew past Jupiter in February 2007 for a gravity boost which reduced journey time to Pluto by four years. It conducted a six-month-long reconnaissance flyby study of Pluto and its moons in summer 2015, culminating with the closest approach to Pluto on 14 July 2015. As well as the first mission to an ice dwarf planet, New Horizons is also the first mission since Voyager in the 1970s to an unexplored planet. The official NASA science goals for the Pluto-system exploration element of the New Horizons mission were prioritised into three categories: required, important and desired. A key goal was mapping the surfaces of Pluto and Charon with an average resolution of one kilometre (the best the Hubble Space Telescope can do is a 500km resolution) and mapping the surface composition of the various geological regions of the two bodies. Another key goal was determining the composition, structure and escape rate of Plutos atmosphere. The lower priority goals include measurement of surface temperature and a search for additional satellites or rings around Pluto. The full list of science goals appears in Appendix 1. The seven instruments on New Horizons were selected to meet these science goals. They are the most capable suite of instruments ever launched on a first reconnaissance mission to an unexplored planet (now dwarf-planet). They include an imaging spectrometer to probe atmospheric composition and planet structure; a visible and infrared camera to obtain high-resolution colour maps and surface composition maps; a long-range telescopic camera for high-resolution surface images; particle spectrometers to measure charged particles in and around Plutos atmosphere; a detector to measure masses of space-dust particles; and two copies of a radio science experiment to examine atmospheric structure, surface thermal properties and planet mass. The seven instruments are listed in Appendix 2. Although considerably more work needs to be done to analyse the data received from New Horizons it is now clear that all NASAs science objectives have been met. On 14 July 2016, the anniversary of the fly-by in 2015, NASA published Principal Investigator, Alan Sterns, top ten discoveries so far from the Pluto element of the mission. They range from the unexpected complexity of Pluto and its moons to the lower than predicted escape velocity, and the ten have been used as a focus for this dissertation. The geology of Pluto Prior to New Horizons, the best images of Plutos surface were obtained from the Hubble Space Telescope. A colour map released in 2010 isnt sharp enough to show any features, such as craters or mountains, but does show a degree of complexity and variegation with white, dark-orange and charcoal-black terrain. However, the evidence revealed by New Horizons of current geological activity was completely unexpected and the variety of landscapes on Pluto is also much greater than expected. Hummocky cratered uplands, washboard terrain (expanses of parallel ridges and troughs), chaotic blocky mountains, cellular and non-cellular nitrogen ice plains, pitted hummocky nitrogen ice plains and rugged dark highlands all feature. A prominent feature of the encounter hemisphere (EH) is Sputnik Planum (SP), an 870,000km ² oval-shaped plain on the left side of the heart-shaped Tombaugh Regio. SP is most likely composed of volatile ices Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡, CO and CHà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¾ and is the largest known glacier in the solar system. Computer simulations have been produced to show that the surface of SP is covered with icy, churning, convective cells which recycle their surfaces every 500,000 years. The modest internal heat of Pluto causes great blobs of solid nitrogen to rise up, then cool and sink back down. This helps explain why no impact craters have been observed on SP which has a crater retention age of no greater than 10 million years. Pluto and its largest satellite Charon are both tidally locked which means that one hemisphere of Pluto is locked facing one hemisphere of Charon. They both spin and orbit in 6.4 days. Data from New Horizons shows that SP is almost exactly opposite Charon: the chance of this happening randomly is 5%. It is proposed that a subsurface ocean exists under SP and that over millions of years the planet has spun around, aligning the subsurface ocean and SP above it, almost exactly opposite the line connecting Pluto and Charon. Along the west margin of SP there extends for hundreds of kilometres a discontinuous chain of mountains consisting of discrete angular blocks with apparently random orientations and sizes up to 40km across and 5km high (calculated by shadow length). Prior to New Horizons it was known that Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡, CO and CHà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¾ ices existed on the surface of Pluto, but once the images of these mountains were viewed it became clear that these ices could not support such high elevations and therefore water ices must be present. This has now been confirmed spectroscopically by New Horizons. Because water ice is buoyant with respect to N2 and CO ice, some small blocks can be carried along by convective or advective motions and larger blocks can be undermined, shifted and rotated. Because of this its possible, if the solid Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡/CO ice is sufficiently deep, that some of the smaller mountains observed may be floating within the plains, although the elevation of the l argest mountains on the western margin of SP suggests that they are most likely grounded on the basement. It is not known why there are no mountainous terrains at the eastern edge of SP. At a few locations at the eastern boundary of SP and the pitted uplands, smooth materials connect with SP along the floors of troughs 1.5 to 6km wide. High-phase imaging of the southernmost of these systems has shown clearly visible medial flow lines within the troughs, with the ice in the troughs sloping at an angle of 2-3 degrees over 50km. This implies glacial-like flow of the plains material into SP. At present it is unknown if the flowing ice carved the troughs. Cthulhu Regio (CR) is a large dark area ranging from ~ 15 °N to 20 ° S and bordering TR at 160 °E and stretching almost halfway around the planet to 20 °E . The region, comprised of a variety of geographical terrains, is covered by a thin dark mantle likely to be deposits of atmospheric Tholin. Tholin is a hydrocarbon formed by the action of sunlight on the methane in Plutos atmosphere. The methane molecules link together in progressively longer chains and as they get heavier they form a haze which eventually settles to the surface. Two broad quasicircular mounds, south of SP, might have an origin involving cryovolcanism. The smaller, Wright Mons, is 3-4km high and ~150km across, with a central depression at its summit at least 5km deep with a rim showing concentric fabric. The larger, Piccard Mons, is similar but reaches ~6 km high and 225km across. If their origin is cryovolcanic it would entail materials much stronger than Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡ ice. There are features on the EH which suggest prolonged tectonic activity. Numerous belts of aligned troughs and scarps, that can reach several hundred kilometres in length and several kilometres high, are often observed to cut across pre-existing landforms as well as branch into each other and these have been interpreted as extensional fractures in varying stages of degradation. The differing fault trends and states of degradation suggest several deformation episodes and prolonged tectonic activity. The great length of individual faults on Pluto, their scarp steepness and spectral evidence strongly suggest a thick water-ice lithosphere rather than a thin one or one made of any of Plutos volatile ices. Pluto displays a wide variety of crater morphologies and sizes vary from ~ 0.5 to 250km, not including any possible ancient basin underlying SP. Crater densities vary widely, from heavily cratered portions of CR to the apparently un-cratered SP. From the total cumulative crater size-frequency distribution its been concluded that Plutos surface, as a whole, dates back nearly to the time of the end of Late Heavy Bombardment (LHB)- perhaps 4 billion years ago. On the EH only the eastern portion of CR appears to approach the saturation crater densities expected of a terrain that has survived from the LHB itself. In contrast the water-ice mountains and the mounds mentioned previously are very young and no craters, down to a diameter of 2km, have been detected on SP. This implies a model crater retention age of no greater than 10 million years for SP and possibly much less. The atmosphere of Pluto A major goal of the new Horizons mission was to explore and characterise the structure and composition of Plutos atmosphere. Much more work is required to fully analyse the data obtained, but already understanding of Plutos atmosphere has been revolutionised. Ground based stellar occultation had shown an atmosphere around Pluto composed primarily of Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡ with trace amounts of CHà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¾, CO and HCN, with complex surface interaction and an uncertain surface pressure of ~3-60 ÃŽÂ ¼bar and a warm stratosphere at ~100K above a much colder surface (38-55K). The New Horizons trajectory allowed near simultaneous radio (using REX) and solar (using ALICE) occultations. The spacecraft passed almost diametrically behind Pluto, as viewed from Earth, with ingress near the centre of the anti-Charon hemisphere and egress near the centre of the Charon facing hemisphere. The atmospheric structure at altitudes 0 to 50km was retrieved from REX. A strong temperature inversion at both ingress and egress was found for altitudes below ~20km, consistent with measurements taken from Earth. However new evidence of horizontal variations in temperature was discovered from two notable differences between the REX profiles at entry and exit. First, the temperature inversion at entry is greater than that at exit; the derived mean vertical gradient in the lowest 10km of the inversion is 6.4  ± 0.9 Kkmà ¢Ã‚ Ã‚ »Ãƒâ€šÃ‚ ¹ at entry but only 3.4  ± 0.9 Kkmà ¢Ã‚ Ã‚ »Ãƒâ€šÃ‚ ¹ at exit. Second, the temperature inversion at entry ends abruptly at an alti tude of ~4km, marking the top of a distinctive boundary layer. The temperature inversion at exit, however, appears to extend all the way to the surface, with no evidence for a boundary layer at this location. These differences in temperature structure cannot be accounted for by night-time radiative cooling or daytime solar heating within the atmosphere because the radiative constant of Plutos atmosphere is approximately 700 Pluto days. From REX data, surface pressure has been estimated at 11  ±1 ÃŽÂ ¼bar at entry and 10  ± 1 ÃŽÂ ¼bar at exit. Analysis of stellar occultation data from 2012 and 2013 yielded essentially the same result indicating that the mass of Plutos atmosphere has not changed significantly in recent years. REX data shows that at occultation exit, temperature adjacent to the surface is 45  ± 3K: this may be indicative of a surface material less volatile that Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡ ice because a surface covered in Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡ ice would have a temperature of 37.0K to remain in vapour pressure equilibrium with the measured surface pressure of Pluto. At occultation entry, close to the region SP, the mean temperature in the lowest 4km above the surface is 37  ± 3K close to the saturation temperature of Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡. It is suggested that this layer of cold air could arise directly from sublimation of the Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡ ices in SP. Calculations have shown that it would take approximately two years for downward heat conduction in the overlying temperature inversion to establish and an inversion that extends to the ground. So the observed boundary layer would have vanished on this timescale without the resupply of cold Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡: further confirmation of SP as a sublimation source. Models indicate that photochemistry in Plutos upper atmosphere is similar to that of Titan and Triton. Methane is processed into heavier hydrocarbons by far-ultraviolet sunlight and also solar Lyman ÃŽÂ ± photons. The solar occultation results show that the upper atmosphere is much colder than previously thought. The observed Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡ opacity at high altitudes was lower than expected. The absorption of sunlight in the 57-64nm wavelength range by Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡ at high altitudes (850 to 1400km) constrains the temperature of the upper atmosphere to be approximately 70K. The mechanisms by which Plutos upper atmosphere is being cooled are not yet understood. The existence and complexity of Plutos hazes, as detected by LORRI and MVIC, was unexpected. Extensive, optically thin hazes extend to altitudes of >200km. Distinct layers are present which vary with altitude but are contiguous for over 1000km. In the highest resolution images from MVIC about 20 haze layers are resolved. The haze is unexpectedly blue, suggesting a composition of very small particles thought to be tholin-like in composition from the scattering properties observed. The layers in the haze are possibly the result of internal gravity waves driven by sublimation forcing orographic forcing. Pluto has a much lower than predicted escape rate. Prior to New Horizons the escape rate to space of Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡ was calculated to be in the region of 2.8 x 10 ²Ãƒ ¢Ã‚ Ã‚ · molecules sà ¢Ã‚ Ã‚ »Ãƒâ€šÃ‚ ¹ based on estimates of Plutos surface pressure and radius, as well as CHà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¾ and CO mixing ratios. However these calculations did not take into account the cooling of the upper atmosphere. Its now calculated that the escape rate for Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡ is 1 x 10 ²Ãƒâ€šÃ‚ ³ molecules sà ¢Ã‚ Ã‚ »Ãƒâ€šÃ‚ ¹. The escape rate calculated for CHà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¾ is 5 x 10 ²Ãƒ ¢Ã‚ Ã‚ µ molecules sà ¢Ã‚ Ã‚ »Ãƒâ€šÃ‚ ¹ which is much closer to estimates prior to New Horizons and also 500 times faster than that of Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡. If these rates for Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡ and CHà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¾ are stable over a single Pluto orbit and over the age of the solar system, the equivalent thickness of Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡ and CHà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¾ surf ace ice lost to space would be approx. 6cm and 28m respectively. This relatively small amount of Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡ loss is consistent with an undetected Charon atmosphere but appears to be inconsistent with the erosional features seen on Plutos surface. This suggests that Nà ¢Ã¢â‚¬Å¡Ã¢â‚¬Å¡ escapes in the past may have been occasionally higher. The loss of methane is a suggested origin for Charons north polar red colour, involving varnishing of the winter poles over millions of years through cold-trapping and polymerisation of escaping hydrocarbons from Pluto. Charon The EH of Charon has two prominent features: a tectonic belt of ridges and canyons in the equatorial region and a dark reddish cap to the North pole. The tectonic belt is more than 200km wide in places and consists of scarps, ridges and troughs which are almost parallel. There are two long, narrow, steep-sided depressions (chasmata). Serenity Chasma is >50km wide and ~5km deep and Mandjet Chasma reaches ~7km deep. Both chasmata are similar to extensional rifts visible on several mid-sized icy satellites such as Saturns Tethys. Its assumed that the tectonic belt is the result of substantial, aligned tectonic extension of Charons icy crust. The fact that several large craters are visible on the chasmata implies that the extension is geologically old. North of the tectonic belt there is rugged, cratered terrain. Mountains of 20km can be seen in the limb profiles. The crater density at large sizes on the northern terrain implies a surface age older than ~4 billion years. The Northern hemisphere is capped by dark reddish region named Mordor Macula (MM), the extent of which does not correlate with any specific terrain boundary or geological feature. Layer This is an unusual feature because polar caps on other bodies tend to be bright, not dark, due to some kind of reflective ice or frost. Because the red-stained areas of Pluto look similar to MM it was originally thought that they might have similar origin. Its now known that Plutos red-staining is due to atmospheric tholins and since Charon has no atmosphere the origin could not be the same. Its now proposed that the tholins on Charon are made from methane escaping from near-by Pluto. The methane sticks to the winter pole where the temperature is lowest and the ultraviolet light rec eived at night is sufficient to start to link the methane molecules together. As daytime comes, the molecules are heavy enough to remain on the surface and sunlight completes the process of polymerisation to form tholins. South of the tectonic belt the surface is smoother, comprised of seemingly continuous plains named Vulcan Planum. Tectonic resurfacing is one possible origin of these plains. Areas of relatively low crater density and at least one pancake-shaped unit might imply cryovolcanic resurfacing. The spatial distribution of tectonic features across Charon is not consistent with the types of patterns predicted from tidal or de-spinning stresses. This may point to Charon having had an ancient subsurface ocean that subsequently froze producing the extensional features and possibly allowing the eruption of cryovolcanic magmas. The small moons of Pluto When the New Horizons mission was green-lighted only the dwarf planets Pluto and Charon were known. Then in 2005 the two small moons Nix and Hydra were discovered by the Hubble Space Telescope, followed by the even smaller moons, Kerberos and Styx, in 2011 and 2012 respectively. It had been expected that New Horizons would detect additional satellites but no other moons larger than approx. 1.7km in diameter are present at orbital radii between 5,000 and 80,000km. The general hypothesis is that Pluto and its satellites were produced by the collision of Pluto with a similar Kuiper Belt object and it was hoped that New Horizons would provide information on whether this was the case. Several findings have helped to reinforce this hypothesis. First, the small moons are highly elongated, suggesting they formed and grew by the agglomeration of small objects, but, due to their size, their gravity was not sufficient to pull the material into a spherical shape. Indeed, from New Horizons images Kerberos appears to have a double-lobed shape suggesting the merger of two bodies. The shapes are consistent with the hypothesis that they all formed in the remnant disk produced by the collision that formed the Pluto-Charon binary. Second, it has been found that all four satellites have high geometric albedos, ranging from 0.56  ± 0.05 to 0.83  ± 0.08. In contrast, the majority of small KBOs have geometric albedo of ~ 0.1. This is further evidence that the moons were formed from the remnant disk rather than being captured gravitationally from the general Kuiper Belt population. Third, 11 craterlike features have been identified on Nix, and 3 craterlike features on Hydra. Crater densities have been calculated which exceed the values found on the older regions of Pluto and Charon and suggest that the surfaces of Nix and Hydra date back to at least 4 billion years ago. This fact again supports the formation hypothesis. From the high surface albedo of the moons, its strongly suggested that, like Charon, they are covered with water ice. Unlike Pluto and Charon, which rotate synchronously, the small moons are not synchronous and rotate much faster than expected with rotation periods ranging from 0.43 days to 5.31  ± 0.10. In addition, the rotational poles of the small moons are almost at right angles to the common rotational poles of Pluto and Charon. These rotation speeds and axes have not been observed in other regular satellite systems and imply that tidal spinning has not played a major role in the moons rotational histories. A future study will determine whether chaos has played a part.

Standardized Test Scores and Their Use in College Admissions Decisions

Standardized Test Scores and their use in College Admissions Decisions PURPOSE The purpose of this proposal is to examine current and future Iowa State University admissions decisions processes. At the present time most colleges, including Iowa State use a combination of standardized test scores, high school class rank, high school grade point average, and essays to make decisions on admissions. All of the above are good determinants of a student’s possible success in college, except standardized test scores. Standardized tests discriminate against minorities and are not a good overall indicator of a student’s potential. For these reasons and others, Iowa State should not use standardized test scores when making admissions decisions. BACKGROUND Since America’s college system began, someone has had the responsibility of deciding who gets into a college and who does not. Colleges and universities must draw the line somewhere as to who has the opportunity to become more educated and who gets a full-time job at McDonald’s. This decision-making process has always been a difficult job and has become even more difficult in recent years as competition in higher education gets tougher. College admissions departments have come up with a system which combines indicators such as standardized test scores, high school class rank, grade point average, and essays. Different schools put different amounts of emphasis on these gauges but most use some mixture of them. In recent years many schools have begun to put more emphasis on standardized test scores. Almost all college bound students now take entrance exams like the ACT or SAT. These tests supposedly indicate how "smart" a student is and how successful they would be in colle... ...f schools, ranging from small liberal arts colleges to large public universities, have made the switch. Most report many benefits with "no drop-off in the academic quality of their applicants" (FairTest). Colleges and universities could make this decision for themselves or the change could come thorough a statewide policy. For example in Texas, starting in 1998, students applying to public universities who were in the top 10 percent of their graduating high school class, do not have to take the ACT or SAT (State Colleges). A policy such as this is another example of a possible way to emphasize high school achievement rather than test scores. The no standardized test policy should be implemented at Iowa State University as soon as possible. Beginning with the incoming freshman class of 2001, standardized tests should not be used as a tool in admissions decisions.

Bible and Biblical/Christian Worldview

A worldview is how an individual looks at the world and how it works. It is how an individual views and interprets the world they live in. It is an individual’s attitude and ideas about the world that they live in. The biblical/Christian worldview The biblical/Christian worldview of Origin is basically that everything originated from and by God. Everything that exist is because of God and it is God that created everyone and everything. In the beginning was God, therefore he is the ultimate originator. Genesis 1:1, and Colossians 1:16-17. The biblical/Christian worldview of Identity is that men and women were created in the image of God. Our identity is based off God’s creation of us. We are God’s unique creation including all of the animals on earth. The biblical/Christian worldview of meaning/purpose is that our purpose is to get to know God, and have a personal relationship with God through Jesus Christ. The biblical/Christian worldview of morality is through revelation from God and by reading the bible. Through morality we follow God’s standard as how to live and behave as God’s children. The biblical/Christian worldview of destiny is that, we as Christians believing in heaven and hell. When we leave our bodies our soul will carry on to live with God in heaven or with Satan in hell. Those who have not accepted Christ as their personal savior and lived their lives as how we should in the body of Christ will not be welcomed into heaven. How you lived your life on earth will determine your destiny. A Biblical Worldview Influence. A biblical worldview should influence the way I think about, treat and speak to others on a daily basis in that God is love. The way I think about others should be the way Christ thinks of us. The way I treat others should be the same way in which I would want to be treated. The way in which I speak to others should also be in how I would want others to speak to me, with kindness, love and understanding. Referring to the biblical worldview, as Christians, we should treat, speak and think about others as Christ would to us. We were all created in God’s image, therefore we are to try our best to be like him, in our speaking, hearing, reasoning, loving and caring, just as Weider and Gutierrez stated in the reading. Following the Bible as our instruction and the example of Christ, our daily walk with others should be based on love and the teachings of Christ. A biblical worldview should influence the way I treat/interact with the environment and non-human creation in a way that I should treat the environment as God would. God created the environment for us so we should appreciate and value it. Genesis 2:15 states, â€Å"The Lord God took the man and put him in the Garden of Eden to work it and take care of it†, just as Weider and Gutierrez pointed out in the reading. We should treat non-human creation with care and love. God has given us the authority of taking care of non-human creation and we should do exactly as God would do. We are to care for, love and supply for non-human creation, just as we would human creation.

Physical And Psychological Addictions Essays - Behavioral Addiction

Physical And Psychological Addictions Essays - Behavioral Addiction Physical And Psychological Addictions Physical and psychological addictions are very alike and very different at the same time. Addiction means that the person addicted thrives on the substance or action. Physical addictions like alcoholism and heroin are sometimes very noticeable yet, psychological addictions like gambling are very hard to diagnose. A similarity between the two types of addictions are the stages that lead up to a full blown addiction. Addictions go through many stages before reaching the pinnacle of an addiction. For example, a gambler will first start off betting a dollar, then two, then ten, then a hundred until finally the gambler is broke. An example for a physical addiction would be the stages that lead to becoming a true alcoholic. It will all start with one beer, , then Jell-O shooters, then a margarita, then just drinking liquor straight up out of the bottle, then who knows what the drinker will turn to next. After going through all of these stages the term used for the addiction is usually disease because the addiction is going to slowly kill the person addicted. Though the term addiction is usually thought of as someone on drugs or drinking, many normal everyday people are addicted to the one thing everyone has a little of everyday, caffeine. Caffeine is one of North Americas leading addictions prevalent amongst teenagers. Caffeine is found in chocolate, soda, coffee, and tea. In conclusion, this shows that many things can become addictive. No matter what the addiction it is not good. If more people would realize this there would be less of an addiction crisis than there is today.

Nuremberg Trials essays

Nuremberg Trials essays After World War II, the victorious Allies launched an indictment against 24 individuals with a variety of crimes, including the deliberate instigation of aggressive wars, extermination of racial and religious groups, murder and mistreatment of prisoners of war, and the deportation to slave labor of hundreds of thousands of people living in countries occupied by Germany during the war. Among the accused were Nationalists Socialists leaders Rudolf Hess, and Hermann Goring. These trials lasted from November 20, 1945 until October 1, 1946. Most of the evidence was gained by the prosecution from the Allied forces after the collapse of the German government. The trials lasted over 3 years and the effects they had on the world were astounding. Although the Allies claimed they would give the accused a fair and just trial, but the trials were biased and unjust. The Nuremberg Trials were biased acts of vengeance, were the rules and laws were not followed, and only the Nazis were accused. After the war, each one of the countries on the Allied side had their own idea of how to deal with the Nazis. Stalin suggested that they should have trials, but thought everyone was guilty and should be shot. Then there would be no point in a trial because it would just be the slaughtering of whom ever was convicted. He also wanted to do this because he could say it was fair, because he gave them a trial. Churchill even said that they should just be lined up and shot. Since the leaders of the Allies were saying such things as this, it is obvious that the trials were bias. Especially since the Allies ran the trials and each allied country had its own persecutors. All the judges at the trials came from the victorious countries as well. Most of the judges were American or Russian. So there wasnt even a difference of opinion when deciding the fate of these peoples lives. It was a very one-sided trial. During the trials, the Americans ...

The Naturalist and Christian answers to Foundation Worldview Questions Assignment

The Naturalist and Christian answers to Foundation Worldview Questions - Assignment Example When first studying a worldview, it is often helpful to review a variety of definitions for that belief system. Each author brings a different emphasis, providing a fuller understanding of that worldview. Naturalism is the belief that nature is all there is. There is nothing outside of nature, or if there is, it is unknowable. All phenomena, whether physical, biological, psychological, or even spiritual, can be completely explained by laws of nature. God, in this metaphysical system, is inherently a product of human imagination, and therefore a relic from prescientific times, when humans knew no better than to attribute to a supernatural being their own existence and that of everything else they encountered (Johnson, n.d.). In contrast, the question is answered with a resounding "Yes" by someone with a Biblical worldview. Unlike the naturalist who says that matter is eternal, the Christian says that only God is eternal and all matter was created by God. The idea that there is no God has significant impact on the naturalists ethics. If there is no God, then there is no objective, external standard for ethics. There is no way to objectively define right and wrong outside of mankind. Since there is no standard for ethics outside of mankind, ethics are defined by ones culture and society.

Social Ideals of Motherhood, Parenting, and Reproduction (responses) Essay

Social Ideals of Motherhood, Parenting, and Reproduction (responses) - Essay Example Dubois birth control assertion is in fact a state policy now to provide reproductive health to protect women from childbirth mortality. Society has already recognized the injustices of incorrect perspective about women, motherhood and parenting. Racism as Dubois had fought before is no longer tolerated in the workplace nor does it make a coloured woman unfit for motherhood. Davis complaint of women’s unfair treatment at work is slowly being eradicated albeit it has to be admitted that it still exist today. Conscious efforts however are already been made to make to end this discrimination at work. For example, US military has removed the ban on women for combat positions. The economic reality also compels both wife and husband to work together to sustain the household. To those couples who have the opportunity to work together, the option of two breadwinners has become the favourable option rather than merely having the wife stay at home. The social and economic reality makes the assertions of these thinkers either a given or being accepted as fact that it is no longer being