Apollo 13 Essays -- American History

Apollo 13 Apollo 13 launched on April 11, 1970 from the Kennedy Space Center in Florida. The crewmembers aboard the ship were James A. Lovell Jr., John L. Swigert Jr., and Fred W. Haise, Jr. Before the launch, there had been a few problems. Thomas K. Mattingly was supposed to fly on the Apollo 13 but he was exposed to the measles. He didn’t have the antibodies to fight the disease, causing him to not be able to go into space. Swigert took his place. Right before the launch, one of the technicians saw that the helium tank had a higher pressure than expected. Nothing was done to fix this. During liftoff, the second-stage engine shut down, causing the other engines to run longer than planned. Apollo 13 was off to a rocky start. During the flight, the second oxygen tank exploded. The oxygen tank contained liquid required for fuel and oxygen. Liquid oxygen has to be handled very carefully. The astronauts need to constantly stir the oxygen to prevent it from separating. The wires in the device needed to stir the oxygen were damaged, causing a big fire when electricity was passed through them. The explosion caused the number one oxygen to be critically damaged. This was bad because it left the ship with little power. Clueless about the real reason for the explosion, the crew thought a meteoroid had hit them. There was a large amount of damage caused by the explosions. Lovell looked out of the window, thirteen minutes after the explosion. He noticed that the ship was venting some gas out into space. Oxygen gas was leaking out of the spacecraft. Reacting on impulse, the astronauts closed the hatched between the Command Module and Lunar Module. Slowly, the crew and ground controllers began to realize that Apollo 1 3 was losing oxygen. Ap... ... to be separated from the ship. The Command Module had to be powered up again after being shut down for a long time. Mission Control had to write new documents for this new action. Normally, documents are written in three months before being performed. Mission Control, obviously, did not have that amount of time, causing them to have to write new documents in three days. Next, the crew got in the command module and let the lunar module go. The hard part was over. The ship landed safely in the South Pacific Ocean. The crew was rescued and brought onto the USS Iwo Jima. All three astronauts were returned to Earth unharmed. http://en.wikipedia.org/wiki/Apollo_13 http://www.lpi.usra.edu/lunar/missions/apollo/apollo_13/overview/ http://science.ksc.nasa.gov/history/apollo/apollo-13/apollo-13.html http://www.nasm.si.edu/collections/imagery/apollo/AS13/a13sum.htm

Tinbergen’s Four Questions Regarding Orca Behaviour

Introduction The type of communication used to transmit information is closely related to the animal’s lifestyle and environment. This can be seen in most terrestrial mammals which are nocturnal so use olfactory and auditory which work as well in the dark as they do during the day. Visual communication would be relatively ineffective in this lifestyle. In contrast humans are diurnal and use primarily visual and auditory signals for communication, but miss many chemical cues which many other mammals base their behaviour upon.Marine mammals often need to communicate great distances, and the water does not support visual cues over great distance. This is why whales and dolphins use primarily auditory signals. Auditory signals can travel great distances and travel four and a half times faster in water than in air (Ford, 1984). Killer whales or Orca (Orcinus orca) are very social dolphins and live in pods often consisting of family members from between four up to fifty for resident ial whales while transient pods normally are only between two and five animals (Ford, 1989).These pods communicate with each other by use of echolocation clicks, tonal whistles and pulsed calls (Deecke et al. , 2000). The three main noises have very different uses from each other. Clicks can either be produced as a single click or produced in rapid succession. Single clicks are generally used for navigation and collection of clicks and whistles are thought to be used for communication amongst members of the pod. Pulses are believed, with the assistance of single clicks, to be the method used by orcas to distinguish objects and discriminate prey (Barrett-Lennard et al. 1996). Residential orcas feed on fish, and can be frequently heard communicating with the clicks, whistles and calls because the fish have very poor hearing abilities (Wilson, 2002). The vocal behaviour of transient killer whales is quite different with the vocal communication consisting of occasional clicks and pulses (Deecke et al. , 2000). The only occasion where transient orcas display significant amounts of vocal activity is when they are active on the surface or recently after a kill.The reasons for this reduction of noise could be due to many factors which can be seen in other species interactions and behaviour. Using ‘Tinbergen’s four questions’, I will explain what necessity for this behaviour and what the origins of the silent behaviour may have been. Tinbergen’s Four Questions In 1963 Nikolaas Tinbergen published a paper â€Å"On aims and methods of ethology†. In this paper he discussed how he believed any question regarding animal behaviour should be broken down into four different questions.These four questions could be divided into two categories, evolutionary (ultimate) explanations and proximate explanations. The evolutionary explanations, which refer to the population, include evolution or phylogenetic determinants and survival value or adaptive significance. The phylogenetic determinants refer to all evolutionary explanations which are not covered by adaptive significance. These may include random processes including mutation and changes in the environment which could have impacts on the population resulting in a specific behaviour adaptation.The adaptive significance closely follows Charles Darwin’s work on natural selection where it is explained that an animal’s form has been altered to function better in the habitat and resulting in a increase in fitness for the individual. The proximate explanations are focused with dealing in terms of the individual as opposed to the population. The two different individual questions proposed by Tinbergen relate to causation and ontogeny. The causation for a display of behaviour relates to the mechanics of the body and which stimuli provides a cue for the animal to display this behaviour.Included in causation is control of hormones, motor control, central-nervous-system control and the ability to process the information obtained through senses. Ontogeny relates to the development of an individual, from conception til death. This may include a experience or a environmental factor which occurs and changes the behaviour of the animal, including learned behaviour from another individual. Causation ? Figure 1: An illustration of sound generation, propagation and reception in a killer whale. (WhalesB. C. com)The nasopharyngeal anatomy of cetaceans is strongly modified comparing with terrestrial mammals. They have one impair respiratory hole at the top of the head. It is closed near the surface by dense musculocutaneous crimps arranged so, that the salient of one of them enters into the dimple of another. They form a peculiar lock preventing the water from penetrating into respiratory tract. Above the skull around of nose passage there is a system of pneumatic sacs, connected with nose passage (Barrett-Lennard et al. , 1996).In 1964 A. V. Jablokov suppose d that sounds could be produced by forcing air through these nasal sacs. Air is forced past a set of finely striated muscular plugs or lips that vibrate or slap against each other as the lips are forced apart by the stream of air and then slapped shut by muscular tension (Ford, 1989). Transient killer whales are often very difficult to track when under water as they are typically silent. Often communicating with each other with just a single click, known as a cryptic click (Deecke et al. , 2000).The only time that the killer whales produce large amounts of vocal activity was when milling about on the surface or after killing a marine mammal. Transients have been found to only use four to six discrete calls which are not shared with the resident pods (Deecke et al. , 2004). Ontogeny Like other aspects of learning in mammalian society, I hypothesise that the newborn calves will be taught the ability for vocalisation by its parent or other pod members. There have been many studies on k iller whale vocalisations in different parts of the world including Canada (Ford, 1984), Alaska (Yurk et al. 2002) and Norway (Matkin, 1988). Each study showed that every pod has its own distinctive repertoire of discrete calls, often this phenomenon is referred to as vocal dialects. The differences in vocal repertoires can be the result of geographic isolation and when this occurs it is not dialects that are being represented but â€Å"geographic variations of vocal repertoire† (Ford, 1984). The use of repetitive calls and the specific number and type of discrete calls are what are used to classify and compare dialects. Pods often produce between seven and seventeen different types of discrete calls.Some pods share calls and are grouped together as a acoustic clan (Baird et al. , 1988). Different clans might represent different independent maternal lineages, which have persisted for many generations, developing their independent call traditions. Dialects are probably the mea ns by which pod cohesiveness and identity are maintained. Newborn calls manage to produce calls very comparable to their mothers, but the repertoire is very limited. With the arrival of a new calf to the pod, the calls of the pod and particularly the matriarch increase, especially the frequency of pod-specific calls (Ford, 1989).This is widely regarded as the method to which newborns learn the pods dialect. The majority of the learning done by the newborn is a process of imitation and trial and error. The calf does not always learn communication from a parent. In captivity a young whale was observed to have learned the calls of its tank mate, even though it had no relatedness. Survival Value I hypothesise that the because the mammalian predators can hear well under water is the reason why the transient killer whales adopt significantly reduced communication during periods of foraging.Acoustic communication can have great benefits such as organising groups for attacks and avoiding pr edation. As with all behaviour traits there is a trade off. There is a direct cost of energy required to producing the sounds and along with this is the loss of energy from lack of feeding during times of communicating. There is also a indirect cost, especially for transient killer whales, which pass information on to eavesdroppers. Eavesdroppers may include competitors (Hammond et al. , 2003), predators (Hosken et al. 1994) or for transient killer whales alerting potential prey. Various studies have documented the costs from eavesdropping for prey in the case of predators who utilise echolocation. Bats have been documented preying on frogs performing mating calls by eavesdropping on them (Fenton, 2003). Insects have also been noted as being able to avoid predation from bats by listening to their acoustic projections (Rydell et al. , 1995). Communicative vocalizations are usually not essential for prey location unlike echolocation.This is the most likely reason that transient killer whales move in silence or considerably reduced vocal communication while foraging. Evolution I believe that the evolution of marine mammals from a common ancestor hinders the transient killer whales hunting due to the retention of excellent underwater hearing by marine mammals. In Pakistan the discovery of Ambulocetus was remarkable, a three metre long mammal which resembled a crocodile. It is thought to be the transitional fossil starting the mammalian movement towards an aquatic life.By 38 million years ago mammals had fully adapted to a aquatic life with the emergence of Basilosaurus and Dorudon. Although these large marine mammals resembled modern whales and dolphins they lacked the ‘melon organ’ which allows echolocation in their descendants (Ford, et al. , 2000). In the middle of the Oligocene (33 million years ago) a animal called Squalodon is thought to have been the first to use echolocation. With a cranium which was well compressed, and a telescoped rostrum i t displayed a skull similar to modern dolphins.A big problem with the hunting marine mammals is that they all have a common ancestor, and all have retained a common lineage of very good hearing. Fish have poor hearing which allows the residential killer whales to freely use communication when hunting. Transient killer whales have been forced to change this behaviour because of their choice of prey including seals, dolphins, porpoises and whales. With all mammals having good underwater hearing they have been required to adopt a reduced vocal communication when searching for prey. ConclusionI believe that the lack of acoustic communication between transient killer whales is due to the ability of their selected prey being able to hear the clicks, whistles and pulses they generate. These sounds can be heard from over seven kilometres away and marine mammals do react to these calls (Deecke et al. , 2002). In the study by Deecke in 2002, he played the sounds of killer whales near a harbou r seal colony which resulted in most of the seals displaying strong anti-predator behaviour of leaving the water. This suggests that they are able to clearly hear the calls and understand what is generating them.I believe that other marine mammals will react in a similar way. Guinet (1992) observed the vocal patterns of killer whales around the Crozet Archipelago and came to the same result as Deecke (2004) that the killer whales were silent throughout hunting and searching, but once a mammalian kill was made the pod would greatly increase in vocal activity. While it can be a risk to produce noise after killing a prey, for fear of drawing the attention of other predators or scavengers, killer whales are the apex predator and have no natural predators.Resources Baird, R. W, Stacey, P. J. , (1988). Foraging and feeding behaviour of transient killer whales. Whalewatcher vol 22, no. 1:11-15 Barrett-Lennard, L. G. , Ford, J. K. B. , Heise, K. A. , (1996). The mixed blessing of echolocati on: differences in sonar use by fish-eating and mammal-eating killer whales. Animal Behaviour, 51: 553-565 Deecke, V. B. , Ford, J. K. B, Sprong, P. (2000). Dialect change in resident killer whales: implications for vocal learning and cultural transmission. Animal Behaviour 60: 629-638 Deecke, V. B. Ford, J. K. B, Slater, P. J. B. (2002). Selective habituation shapes acoustic predator recognition in harbour seals. Nature 420: 170-173 Deecke, V. B. , Ford, J. K. B, Slater, P. J. B. (2004). The vocal behaviour of mammal-eating killer whales: Communicating with costly calls. Animal Behaviour 69: 395-405 Fenton, M. B. (2003). Eavesdropping on the echolocation and social call of bats. Mammal Review 33: 193-204 Ford, J. K. B. (1984). Call traditions and vocal dialects of killer whales (Orcinus orca) in British Columbia. Ph. D. hesis, University of British Columbia Ford, J. K. B. (1989). Acoustic behaviour of resident killer whales (Orcinus orca) off Vancouver Island, British Columbia. Can adian Journal of Zoology 67:727-745 Ford, J. K. B. , Ellis, G. M. , Balcomb, K. C. (2000) Killer whales the natural history and genealogy of Orcinus orca in British Columbia and Washington State. Vancouver: University of British Columbia Press Guinet, C. (1992) Comportent de chasse des orques (Orcinus orca) autour des iles Crozet. Canadian journal of Zoology 70: 1656-1667Hammond, T. J. , Bailey, W. J. , (2003) Eavesdropping and defensive auditory masking in an Australian bush cricket, Caedicia (Phaneropterinae: Tettigoniidae: Orthoptera). Behaviour 140: 79-95 Hosken, D. J. , Bailey, W. J. , Oshea, J. E. , Roberts, J. D. (1994) Localization of insect calls by the bat Nyctophilus geoffroyi (Chiroptera, Vespertilionidae): a laboratory study. Australian Journal of Zoology 42: 177-184 Matkin, D. (1988) Killer whales of Norway. Homer: North Gulf Oceanic Society Rydell, J. , Jones, G. , Waters, D. 1995) Echolocating bats and hearing moths: who are the winners? Oikos 73: 419-424 Wilson, B. , Dill, L. M. (2002) Pacific herring respond to stimulated odontocete echolocation sounds. Canadian Journal of Fisheries & Aquatic Sciences 59: 542-553 Yurk, H, Barrett-Leonard, L. , Ford, J. K. B. Matkin, C. O. (2002) Cultural transmission within maternal lineages: vocal clans in resident killer whales in southern Alaska. Animal Behaviour 63: 1103–1119 Vocal behaviour of mammal-eating killer whales A report on a unique behavioural characteristic By Michael Clark 83787877

Structured Report Example

A structured report is an essay that uses a certain structure in order to present a report on a particular issue. The use of structured data allows the reader to analyze the scale of a problem under discussion more precisely. As a rule, a structured report consists of the introductory paragraph, main body, and conclusion. Most commonly, a structured report is used in social studies, business, economy, or geography areas. The structured report example demonstrates the proper structure and use of data needed to be presented in most structured reports. Homelessness has been a hot issue throughout the whole US history. According to the US law, a person is considered homeless if he or she does not have a constant place for sleep. Such people have the right to stay in the public or private shelters. About 550 thousand people (one in the seven-hundredth resident of the country) in the US have been identified as homeless in 2015 (The U.S. Department of Housing and Urban Development, 2016). The lack of affordable housing and assistance programs to the poor are the most significant causes of the homeless population growth in the US. Another important reason for homelessness is a domestic violence. According to the Ford Foundation research, approximately 50% of all homeless women and children were victims of beatings or other forms of violence in their own family (Zorza, 1991). However it is, the level of homelessness significantly decreased for the last 15 years, which shows that US social policies are on the right way now. Fifteen years ago, US social protection policy was not able to completely solve the problem of homelessness. A study conducted by the U.S. Conference of Mayors in 2001, reveals that in 27 major cities, among those people who asked for shelters about 37% have not received assistance since the shelters were overcrowded (Hunger and Homelessness Up Sharply in Major U.S. Cities, 2001). The number of such cases in 2001 increased by 11% compared with the previous year, while the number of places in shelters has changed slightly. The same indicators on the situation of homeless families were even worse that year: the administrations of shelters refused to lodge for about 52% of the families seeking help. The number of homeless people simply was much higher than the number of places in shelters. What is more, it is known that homeless shelters are the predominantly urban phenomenon. Outside the big cities, there almost were no shelters, although homeless people were present there as well. In fact, many homeless people were forced to seek temporary shelter among their relatives and friends, constantly changing their place of residence. This category of people is mostly not considered as homeless. According to the US Department of Education report, in 2000 only 35% of homeless children and young people were living in shelters; 34% lived alternately in the relatives or friends house, and 23% lived in cheap hotels (The U.S. Department of Education, 2004). Taking the given data all together becomes clear that the US were far from providing all the needed resources for decreasing the homelessness level 15 years ago. According to estimates of the Ministry of Housing and Urban Development, during the last few years, the number of homeless people in the US, is markedly reduced (The U.S. Department of Housing and Urban Development, 2013). At the end of January 2013, about 610,000 homeless were registered in the US. It is 4% lower in than it was in 2012. The number of homeless veterans has decreased more significantly: by 6%, there were about 58,000 of them. The number of so-called chronic homeless people and homeless families reduced as well. References Hunger and Homelessness Up Sharply in Major U.S. Cities. (2001). usmayors.org. Retrieved 20 September 2016, from http://usmayors.org/pressreleases/documents/hunger_121101.asp The U.S. Department of Education,. (2004). Education for Homeless Children and Youth Program. Washington, DC. The U.S. Department of Housing and Urban Development,. (2016). The State of Homelessness in America (p. 7). Washington, DC: National Alliance to End Homelessness. The U.S. Department of Housing and Urban Development,. (2013). The 2013 Annual Homeless Assessment Report (AHAR) to Congress. Zorza, Joan. Woman Battering: A Major Cause of Homelessness, in Clearinghouse Review vol. 25, no. 4, 1991.