Modern Times and The Importance of Food †Film Essay

Modern Times and The Importance of Food – Film Essay Free Online Research Papers Modern Times and The Importance of Food Film Essay â€Å"Modern Times† is a black and white film from the nineteen thirties that considers the working man and working conditions during the most crushing times of the Great Depression. Charlie Chaplin is the producer, director, musician and main character of this comic film. Throughout the film he goes through many trying times with his working situations in this silent comedy. Food is given a very important role in this depression era film. Food is looked at in many different ways throughout â€Å"Modern Times†. Because food was very hard to obtain for most you can understand why it is focused on many times during the film. Through the silly and comical situations Charlie gets himself into, he finds himself in jail. To our confusion it doesn’t seem to phase him at all, he almost seems happy to be there. When he is let go he doesn’t want to leave because being in jail means he will at least be fed everyday. When he is let go he tries a few thing to get himself thrown back in jail. He tries to take the blame for a girl who stole some bread and when that doesn’t work he goes to a cafeteria, eats as much as he can, then calls the police before not paying for his dinner. The police come and Charlie is happy to be put back in jail. It must have been a tough time if someone would rather be in jail where they are sure to be fed, then begging on the streets. Another way food is shown in much importance in this film is in day dreaming. Charlie and his girlfriend are sitting on the side of the street when they witness a woman waving goodbye to her husband as he leaves for work. They decide to get a house of their own. They sit on the sidewalk and think about what it would be like. In this daydream there is food everywhere. There is a fruit tree just out the window, another just out the door and a cow walks up for milking as the girl is preparing dinner. This is another way food is shown as such a prized possession in this film. It is almost like the only good thing about living in a house together would be food where that isn’t guaranteed at all. Charlie finds a job working as the night watchmen at a department store. All he seems to notice and care about are the cakes and pastries on the counter. After the store is empty he runs to get the girl so they can both enjoy the food. Not only that but a few men brake in and when he calls them burglars they say they are just hungry so he sees nothing wrong with them being there, even after the shoot the top off a wine bottle. Food is such a valued object that it seems to blind his decision and ends up getting him in trouble. At another job of his he helps a man repairing the machines. While attempting to help he ends up helping the man fall into the machine. The man is stuck in the machine when the lunch bell rings and Charlie stops trying to help him out so he can eat his lunch. After a minute the man gets over the fact that he is no longer helping him and has Charlie feed him his lunch while stuck. Food is of such importance that even being stuck in a machine doesn’t stop either of them for wanting to eat there lunch. It is almost like they think if they don’t eat it now it may not be there later and they may have nothing else to eat for the rest of the day. During the worst times of the depression era food was not something to be wasted and was considered on of the most important things. Today we look at food as very important but we don’t really know what it is like to not have food. Most of us haven’t had to wonder where our next meal was going to come from or how we were going to get it. This film, â€Å"Modern Times† reflects how important food was during that era. You can tell it is of great importance even through the comedy of Charlie Chaplin. Research Papers on "Modern Times" and The Importance of Food - Film EssayThe Effects of Illegal ImmigrationWhere Wild and West MeetCapital PunishmentComparison: Letter from Birmingham and CritoThe Hockey Game19 Century Society: A Deeply Divided EraLifes What IfsHonest Iagos Truth through DeceptionAssess the importance of Nationalism 1815-1850 EuropeUnreasonable Searches and Seizures

Oasis Theory and the Origins of Agriculture

Oasis Theory and the Origins of Agriculture The Oasis Theory (known variously as the Propinquity Theory or Desiccation Theory) is a core concept in archaeology, referring to one of the main hypotheses about the origins of agriculture: that people started to domesticate plants and animals because they were forced to, because of climate change. The fact that people changed from hunting and gathering to farming as a subsistence method has never seemed like a logical choice. To archaeologists and anthropologists, hunting and gathering in a universe of limited population and plentiful resources is less demanding work than plowing, and certainly more flexible. Agriculture requires cooperation, and living in settlements reaps social impacts, like diseases, ranking, social inequality, and division of labor. Most European and American social scientists in the first half of the 20th century simply didnt believe that human beings were naturally inventive or inclined to change their ways of life unless compelled to do so. Nevertheless, at the end of the last Ice Age, people did reinvent their method of living. What Do Oases Have to Do With the Origins of Agriculture? The Oasis Theory was defined by Australian-born archaeologist Vere Gordon Childe [1892-1957], in his 1928 book, The Most Ancient Near East. Childe was writing decades before the invention of radiocarbon dating and a half-century before the serious collection of the vast amount of climatic information that we have today had begun. He argued that at the end of the Pleistocene, North Africa and the Near East experienced a period of desiccation, a period of an increased occurrence of drought, with higher temperatures and decreased precipitation. That aridity, he argued, drove both people and animals to congregate at oases and river valleys; that propinquity created both population growth and a closer familiarity with plants and animals. Communities developed and were pushed out of the fertile zones, living on the edges of the oases where they were forced to learn how to raise crops and animals in places that were not ideal. Childe was not the first scholar to suggest that cultural change can be driven by environmental changethat was American geologist Raphael Pumpelly [1837-1923] who suggested in 1905 that central Asian cities collapsed because of desiccation. But during the first half of the 20th century, the available evidence suggested that farming appeared first on the dry plains of Mesopotamia with the Sumerians, and the most popular theory for that adoption was environmental change. Modifying the Oasis Theory Generations of scholars beginning in the 1950s with Robert Braidwood, in the 1960s with Lewis Binford, and in the 1980s with Ofer Bar-Yosef, built, dismantled, rebuilt, and refined the environmental hypothesis. And along the way, dating technologies and the ability to identify evidence and timing of past climate change blossomed. Since then, oxygen-isotope variations have allowed scholars to develop detailed reconstructions of the environmental past, and a vastly improved picture of past climate change has been developed. Maher, Banning, and Chazen recently compiled comparative data on radiocarbon dates on cultural developments in the Near East and radiocarbon dates on climatic events during that period. They noted there is substantial and growing evidence that the transition from hunting and gathering to agriculture was a very long and variable process, lasting thousands of years in some places and with some crops. Further, the physical effects of climate change also were and are variable across the region: some regions were severely impacted, others less so. Maher and colleagues concluded that climate change alone cannot have been the sole trigger for specific shifts in technological and cultural change. They add that that doesnt disqualify climatic instability as providing the context for the long transition from mobile hunter-gatherer to sedentary agricultural societies in the Near East, but rather that the process was simply far more complex than the Oasis theory can sustain. Childes Theories To be fair, though, throughout his career, Childe didnt simply attribute cultural change to environmental change: he said that you had to include significant elements of social change as drivers as well. Archaeologist Bruce Trigger put it this way, restating Ruth Tringhams comprehensive review of a handful of Childe biographies: Childe viewed every society as containing within itself both progressive and conservative tendencies which are linked by dynamic unity as well as by persistent antagonism. The latter provides the energy that in the long run brings about irreversible social change. Hence every society contains within itself the seeds for the destruction of its present state and the creation of a new social order. Sources Braidwood RJ. 1957. Jericho and its Setting in Near Eastern History. Antiquity 31(122):73-81.Braidwood RJ, Çambel H, Lawrence B, Redman CL, and Stewart RB. 1974. Beginnings of Village-Farming Communities in Southeastern Turkey1972. Proceedings of the National Academy of Sciences 71(2):568-572.Childe VG. 1969. New Light on the Most Ancient East. London: Norton Company.Childe VG. 1928. The Most Ancient Near East. London: Norton Company.Maher LA, Banning EB, and Chazan M. 2011. Oasis or Mirage? Assessing the Role of Abrupt Climate Change in the Prehistory of the Southern Levant. Cambridge Archaeological Journal 21(01):1-30.Trigger BG. 1984. Childe and Soviet Archaeology. Australian Archaeology 18:1-16.Tringham R. 1983. V. Gordon Childe 25 Years After: His Relevance for the Archaeology of the Eighties. Journal of Field Archaeology 10(1):85-100.Verhoeven M. 2011. The Birth of a Concept and the Origins of the Neolithic: A History of Prehistoric Farmers in the Near East. Palà ©orient oasis37(1):75-87. Weisdorf JL. 2005. From Foraging To Farming: Explaining The Neolithic Revolution. Journal of Economic Surveys 19(4):561-586.Wright HE. 1970. Environmental Changes and the Origin of Agriculture in the near East. BioScience 20(4):210-217.

Ethical Issues related to the police use of force Research Paper

Ethical Issues related to the police use of force - Research Paper Example However, cases of using too much and illegalized force should decrease since there are new tactics of restricting suspects from their immoral behaviors (Safrath, 2011). In the past days of policing, the street police used force as a tactic of maintaining law and order and making their will obligatory. In the early 1960s, research shows that the police used too much force in the rebellions and disturbances caused by some people. However, the use of force by the police depends on the roles and responsibilities of the police. This means that some of the police in some departments do not exercise force in maintaining their duties since it is not ethically legal. On the other hand, some departments exercise the use of police force and it is sometimes mandatory for these departments to apply force. For instance, in case of riots and rebellion, the police needs to use force in order to maintain law and keep peace (Sagepub.com, 2008). In the United States, the police often exercise force in approximately 2 million cases per year. Each year, the police use force in over 3,600 occasions resulting to a mean of 600 people being killed (Huebsch, 2011). Police use of force is ethically justifiable for policing actions since it helps in maintaining and exercising their discretion. However, with these well-known ethical rules, the police cannot yet determine the infringement since most of them cannot be predictable by the rules. The domestic police and the military police often had common characteristics and same ethical standards. For instance, sometimes they necessitate on using excessive amount of force where required and sometimes they do not require to use force at all (Huebsch, 2011). This paper will analyze the ethical issues associated with police use of force. It will seek to establish whether it is ethically justifiable for police to use force. It is ethically justifiable for the police to exercise force in maintaining law and order. Police officers are

Probability Games Essay Example | Topics and Well Written Essays - 500 words

Probability Games - Essay Example The coin flip has only two probable outcomes, that is, either it is heads or tails. One flipped the coin twenty times and got a result of eleven heads and nine tails. Although flipping a coin is said to have an equal chance of coming up on either side, one’s experience did not have such a result. This may be due to the fact that the experiment was only made twenty times. According to frequentists, â€Å"the probability of getting a heads is 1/2, not because there are two equally likely outcomes but because repeated series of large numbers of trials demonstrate that the empirical frequency converges to the limit 1/2 as the number of trials goes to infinity† (Edurite.com, n.d.). ` When one played the dice roll, one realized that the outcomes are much more than the coin flip because each die has six sides. The other die has also six sides; thus, rolling the two dice at the same time would mean that there are greater possible outcomes. It is therefore harder to predict the results of the dice roll than the coin flip. The method that will be difficult for children to understand is the theoretical method because it is difficult to imagine it. Experimental probabilities are easier to understand because they can see it clearly, such as the coin flipping. For children, using formulas to determine the probabilities is quite a challenge. Through the games that one played, one learned that in determining probabilities, it is important that one knows what the likely outcomes of the experiment are. One also learned that some outcomes may have equal likely outcomes while others may be mutually exclusive events (Homepages.ius.edu, n.d.). There are also some events which may be non-mutually exclusive, which means that some events may have common outcomes (Homepages.ius.edu, n.d.). The study of probabilities is very relevant to decision making. Although, the experiment that one performed by playing the coin flip and the dice roll may not be so important,

Generation of Extreme Ultraviolet Radiation

Generation of Extreme Ultraviolet Radiation Generation of Extreme Ultraviolet Radiation from Intense Laser-Plasma Interactions using Two-Colour Harmonics BRIEF HISTORY Over the past few decades breakthroughs in the production of intense laser fields have meant that multi-terawatt and even petawatt systems are now standard in laboratories**. This has been achieved through reduction of the pulse duration, originally from nanosecond pulses down to femtosecond and recently reaching attosecond levels (1as =10-18s)**. This coupled with important improvements to systems, such as the chirped pulse amplification technique (CPA)**, has allowed laser pulses to be amplified to higher peak powers than ever before and used in laser-matter interactions. The resulting scientific drive from developments such as these pushed achievable laser intensities from 109W/cm2 to the 1014W/cm2, at which the interaction between these high intensity lasers and dense electron-free gas was studied**. Only recently thanks to advances in both laser performance and computer simulation tools has study on laser-plasma interactions in the generation of HHG made progress, providing the possibility to generate sources of incoherent electromagnetic radiation of short wavelength and pulse durations**. As further study was carried out on the interaction of light with relativistic free electrons in plasma, it has reached a point now in which generation of high-harmonics of the fundamental laser, soft and hard x-rays, and shorter pulse duration (1as) lasers of intensities reaching 1018W/cm2 are now possible**. Due to this the generation of high-order-harmonics from high-intensity laser interactions has been a major area of attoscience research within the last decade. HHG PRODUCTION High harmonic generation (HHG) refers to the process in which a high intensity laser pulse is focused onto a target, classically a noble gas, in which strong nonlinear interactions result in the generation of very high harmonics of the optical frequency of the pulse**. This will occur for intensities of 1014W/cm2 and above, where typically only a small amount of this energy is converted into the higher harmonics. From these high-harmonics, spatially and temporally coherent attosecond pulses of extreme ultraviolet light can be generated, which can then be used as a reliable source of highly tuneable short wavelength radiation in many different applications e.g. x-ray spectroscopy**. In the case of high intensity laser-gas interactions this is achieved by tailoring the intensity of the laser pulse so that its electric field amplitude is similar to the electric field in the target atoms**. From this the lasers electric field is able to remove electrons from the atoms through tunnel ionisation, at which point the electrons are accelerated in the field and, with certain conditions controlled, are made to collide with the newly created ion upon recombination. The resulting collision generates the emission of high energy photons**, as shown in fig 1. Fig. 1: HHG three step model. This is known as the three step model; electron is detached from atom through tunnel ionisation, then accelerated within the field away from atom, then accelerated back towards atom where it collides and recombines, from this collision all the energy lost appears as emitted HHG ultraviolet photons. HHG from laser-gas interactions have been used extensively to generate attosecond pulses but is limited in flux and photon energy by low conversion efficiencies between the driving laser energy and the attosecond pulses, this can be attributed to two key factors; loss of phase matching between the driving laser to the generated extreme ultraviolet (XUV) radiation as its propagated through the gas over a relatively large distance, and a restriction on the intensity of the driving laser due to the ionisation threshold of the target gas, this saturation intensity is roughly 1016W/cm2**. Meaning laser intensities above this threshold limit will over-ionise the gas leaving no neutral atoms left to generate the XUV harmonics. The use of laser-solid interaction offers the opportunity of reaching much higher attosecond pulse intensities and generation efficiencies beyond the capabilities of gas based HHG**. The method of generating high-harmonics in laser-solid interactions is fundamentally different than that of laser-gas interactions. Interaction of intense ultrashort laser pulses (of pulse duration around a few femtoseconds) on an optically polished solid surface results in the target surface being completely ionised, generating a dense plasma which will act as a mirror, called a plasma mirror**. The reflection of these high intensity laser pulses will be affected by a wave motion set-up in the electrons within the plasma surface causing it to distort the reflected laser field, resulting in the production of upshifted light pulses and the generation of high-order harmonics**. Due to the coherent nature of this process, these generated harmonics are phase-locked and emerge as attosecond pulse. Fig. 2 Laser pulse moving towards overdense plasma. A key property of this plasma is its electron density, this determines whether the laser is reflected, absorbed or not allowed to pass through. This is known as the density gradient scale length, as the laser pulse interacts with the target and forms a plasma it creates a profile that extends out into the vacuum, forming a plasma density profile. This is a critical factor in HHG and consists of two regions: Overdense scale length, Lod If the electron density is equal to the critical density of the target or above, extending up to the maximum target density, the laser pulse is unable to penetrate through the target and is so reflected or absorbed. Underdense scale length, Lud If the electron density is below this critical density the laser will penetrate through, with some absorption. Fig. 3 Plasma density profile, Lud is underdense region, Lod is overdense region. The critical density is determined from: Where is the angular frequency of the laser. As stated before the target surface is highly ionised by the leading edge of the laser pulse, known as the pre-pulse, therefore becoming rapidly over-dense and creating a plasma mirror of sufficient electron density, ne>nc**. HHG within plasma requires laser intensities >1015W/cm2 for 800nm field**, which is usually stated in terms of a normalised vector potential of a ­0, where: In which; e and m are electron charge and electron mass respectively. c is speed of light in vacuum. E is the amplitude of the lasers electric field. I is the lasers intensity. à Ã¢â‚¬ °l is the laser frequency and ÃŽÂ »l is the laser wavelength. Therefore HHG in plasma requires at least an a0à ¢Ã¢â‚¬ °Ã‚ ¥0.03. Recently is was discovered** that there are two mechanisms that lead to HHG from solid density plasma surfaces; Relativistic oscillating mirror (ROM) Coherent wake emission (CWE) These two process result in different distortions to the reflected laser field and therefore a completely different harmonic spectra produced. CWE Coherent wake emission is a process of three steps; Electrons on the surface of the plasma are drawn into the vacuum by the laser field and accelerated back into the dense plasma once they have gained energy from the driving laser field. When propagating within the dense plasma these fast electrons form ultrashort bunches, creating plasma oscillations in their wake. Within the non-uniform region of the plasma (produced from the density gradient between the plasma-vacuum boundary) the electron oscillations will radiate energy in the form of light of various local plasma frequencies found within this gradient. This process will occur once for every laser cycle therefore the spectrum of the emitted light will consist of harmonics of the laser frequency, in which CWE harmonic spectra have a cutoff at the maximum plasma frequency à Ã¢â‚¬ °Ã‚ ­Ã‚ ­pmax **. This mechanism is predominant at moderately relativistic intensities of a0à ¢Ã¢â‚¬ °Ã‚ ¤1, and short but finite plasma gradient lengths of **. Coherent wake emission has only recently been identified as a factor in HHG in laser-solid interactions but it is known that it along with ROM contributes to the generation of high-harmonic orders below à Ã¢â‚¬ °Ã‚ ­Ã‚ ­pmax and the strength of their respective influence below this threshold is determined by laser intensity**. ROM The other mechanism involved in the generation of high-harmonics from laser-plasma interactions is the relativistic oscillating mirror process, this dominates for relativistic normalised vector potentials of a0>>1, although recent studies have shown that ROM harmonics can be observed even at lower intensities when the plasma gradient length is about **. ROM process occurs when surface electrons in the plasma are oscillated collectively by the high intensity incident laser field to relativistic speeds, the plasma will reflect what it observes as a laser pulse of frequency à Ã¢â‚¬ °+. This à Ã¢â‚¬ °+ frequency is a higher upshifted frequency of the fundamental pulse due to a Doppler effect produced from the relative motion of the laser field to the moving reflection point on the oscillating plasma surface. The actual reflected laser pulse will have a frequency of à Ã¢â‚¬ °++ due to a second Doppler upshift effect as it moves towards an observer/target. This is known as Einsteins relativistic Doppler effect, in which the reflected pulse frequency is upshifted by a factor of 4ÃŽÂ ³2**. Fig 4. Schematic of a relativistic oscillating critical density plasma interaction. From past research it has been found that from this mechanism a power-law decay scaling of I(n)ROMn-8/3 is dominant (where n is the harmonic order) in the harmonic spectrum for harmonic orders above the CWE cut-off point, nCWE,** this is the harmonic order related to the maximum plasma frequency of the target, à Ã¢â‚¬ °pmax, mentioned previously. Where: nCWE = nà Ã¢â‚¬ °max = à Ã¢â‚¬ °pmax/à Ã¢â‚¬ °l = In which; à Ã¢â‚¬ °l is the frequency of the laser, is the maximum electron density of the target, Nc is the critical density shown previously. From this process initial femtosecond pulses can be used to create attosecond pulses. When coupled to a relativistic oscillating mirror it adds an oscillatory extension to Einsteins relativistic Doppler effect, so due to the periodic motion of the mirror to the laser field and the double Doppler upshifts this results in the production of extreme ultraviolet (XUV) harmonics**. These ultra-short pulses have been the focus of much scientific research recently as they offer a promising way to resolve in the time domain the ultrafast dynamics of electrons within materials**. Although the relativistic oscillating mirror process is more suited as a macroscopic model for the effective reflection point of the laser field. It assumes that the surface electrons bunch together as the target is ionised and move out into the vacuum to form the plasma where they remain in the overdense region ensuring that the laser field is completely reflected. More recently studies have discovered there is another mechanism in the relativistic regime that can contribute to the harmonic spectrum via a different process entirely. CSE This other process is known as Coherent synchrotron emission (CSE)** and is needed to explain observations that do not fit the previous two models, in which dense electron nanobunches are created at the plasma-vacuum boundary where they produce coherent XUV radiation through coherent synchrotron emission. This is a microscopic model of HHG in laser-solid interactions. It models the electrons in the plasma moving, in dense bunches, under the influence of the incident laser field and subsequent fields produced from the movement of charges within the plasma. These nanobunches are periodically formed and coherently accelerated through an instantaneously synchrotron-like orbit during each laser cycle, for oblique laser incidences. As certain conditions, such as ultrashort plasma density scale length, are met these bunches emit bursts of sub-femtosecond intense high-frequency radiation. This radiation has properties dependent on the electron trajectories and it has been shown that it can b e modelled as synchrotron radiation**, therefore the coherent XUV emissions are distinctly different from that produced in ROM from relativistic Doppler upshifts. In reality actual electron dynamics may be a mix of CSE and ROM, but due to the complex nature of the changing fields within a plasma it makes it impossible to analytically model with accuracy. Therefore requiring the use of computer simulations to deal with the electron trajectories and their respective radiation emissions. PREVIOUS EXPERIMENTS Based on the work of Edwards et al, 2014, in which the study of attosecond XUV pulse generation from relativistic driven overdense plasma targets with two-colour incident light was performed they used 1D, three velocity, particle-in-cell (PIC) code simulations, which treat oblique incidence with boosted frames, to show how pulse intensity can be improved. They converted a small amount (~5%) of the fundamental laser field energy to an additional laser operating at the second harmonic of the fundamental frequency, to significantly enhance the intensity of the generated attosecond pulses by multiple orders of magnitude. This was based on previous work in which mixing of the fundamental driving laser frequency with the second harmonic was performed on laser-gas interactions to increase the attosecond pulse intensity and isolation (K. J. Schafer et al, 1992). Edwards demonstrated that a significant improvement was also possible through this mixing method in laser-solid interactions following the Similarity theory (proposed by Gordienko and Pukhov,**), that suggests the behaviour of laser-plasma interactions follow a similarity parameter of: 1/S = a0/N à Ã¢â‚¬ °l Where S = ne/a0nc, is a similarity parameter and N = ne/nc which is the ratio of electron density of the plasma to its critical density. Therefore from this it would appear that by doubling à Ã¢â‚¬ °l while using the same laser field amplitude the reflected attosecond pulse intensity would also be increase by a factor of two. One of the main limiting parameters in these experiments is the achievable value of a0, while the largest solid material value of N (lithium at ÃŽÂ »=800nm) is 75, so this type of frequency doubling appears to be a promising pathway to optimising attosecond pulse intensity, although a drawback of this is the negative effect it has on the isolation of the reflected pulses. Therefore they stated that a two-colour method, of partially converting a portion of the fundamental laser field energy to the second harmonic, would be a more attractive alternative. Through this process the advantages of using a higher incident frequency, by increasing the gradient of the electric field at certain points within the pulse generation cycle, without the related decrease in pulse isolation and loss of energy associated to simple frequency doubling can be exploited. In their study they used a normal-incidence beam on a step-like plasma density profile using a mix of the first and second harmonic with a phase difference of to produce harmonics with a higher intensity than either incident field individually. They demonstrate substantial gains after the addition of a small amount of the second harmonic to achieve attosecond pulse enhancement of factors >10. As well as a 10-fold enhancement when using density gradients of 0.05ÃŽÂ » and 0.15ÃŽÂ » with conversions of the fundamental to the second harmonic of 5%-10% at an angle of incidence of à Ã‚ ´=30o. Therefore Edwards was able to go on and state that the relative phase of the two incident harmonics were a critical factor in the improvement in attosecond pulse intensity. This is due to the difference in the driving electric field waveform and corresponding resultant electron motion as is varied. Where they linked the strongest attosecond pulse intensities with sharp transitions in the driving electric field that are aided by the addition of the second harmonic at optimum phases, while phases that break the driving field transition reduce the attosecond intensities to levels sometimes substantially below what could be achieved pre-mixing of the harmonics. Therefore when harmonics are combined without thought to their phases they do not always improve the attosecond strength. Further detail into the trajectories of dense electron bunches, which emit synchrotron like radiation (CSE) was given to help explain this effect, where supressed pulse electrons were shown to follow a longer and slower motion before being accelerated and subsequently emitting, resulting in longer elongated trajectories. Whereas electrons that contribute to the improvement of the attosecond pulse strength are shown to experience a larger field before and during emission. This meant their velocity and acceleration components were larger than the suppressed electrons, giving them more energy as it is driven back into the plasma. Overall they state that the larger the electric field experienced by the electrons increases the intensity of the reflected attosecond pulse, due to the number of electrons travelling in a dense bunch increasing as this larger field that the electrons near the surface experience compresses them into higher density bunches. Another study performed by Yeung et al, 2016, focused on controlling the attosecond motion of strongly driven electrons at the boundary between the pre-formed plasma and the vacuum. They demonstrated experimentally that by precisely adding an additional laser field, at the second harmonic of the fundamental driving frequency, attosecond control over the trajectories of the dense electron bunches involved in intense laser-plasma interactions can be achieved. From this considerable improvements in the high-harmonic generation intensity was observed, which confirms the theoretical work by Edwards in two-colour fields reviewed previously while developing upon this to further factors. Experimentally they showed that attosecond control over the phase relationship of the two driving fields is necessary to optimise the reflected attosecond pulse intensity. While also using PIC simulations to determine the optimal and worst phase relationships, in which a phase of was found to optimise the emission. Microscopic focus determined that during each cycle the emission of the attosecond pulse begins as a primary electron bunch which is compressed and then quickly accelerated away from the surface up to relativistic velocities, from here it emits before it disperses and returns back to the plasma. Secondary bunches are also present but these were found not to have a significant effect harmonic spectrum for orders >20. These bunches were found to emit when their velocities where at their max, which confirmed that the two-colour field phase matched the emitted XUV to the acceleration produced from the fundamental laser field. While at the poorest phase relationship, which Yeung found to be , a plateau in the driving laser field is created which impedes the acceleration of the electrons from the surface, therefore reducing the density of the electron bunch produced that can emit. They concluded from the data provided by the simulations that control of the relative phase of the two colour driving fields has a significant effect the electron bunch dynamics. While from the experimental data their collected it was demonstrated that the HHG produced from the two-colour field was increased substantially when no laser pre-pulse was involved, or equivalently when the plasma has shorter density scale length. Confirming the work of Edwards et al, 2014, that two-colour fields generate significantly more higher-harmonic orders than that of a fundamental field alone, even when only a small percentage (5%-10%) of the fundamental laser energy is converted to the second harmonic. INTRODUCTION TO TWO-COLOUR HARMONICS - ABSTRACT BRIEF SUMMARY OF EXPERIMENT, RESULTS AND CONCLUSION 1x INTRODUCTION BRIEF HISTORY .5x HHG PRODUCTION .5x CWE 1x ROM 2x (inc. plasma theory e.g. scale length) CSE 1x COMPARISON WITH GAS EXPERIMENTS 1x PAST EXPERIMENTS LEADING UP TO THIS ONE 2x INTRODUCTION INTO SPECIFICS OF THIS EXPERIMENT 1x METHOD PIC CODES EXPLAINED 2x EPOCH DETAILS 1x LASER DETAILS 1x PROCESS OF ANALYSIS .5x CREATION OF GRAPHS .5x RESULTS GRAPHS COMPARE CONTRAST IMPLICATIONS CONCLUSION FURUTRE RESEARCH 1x IMPROVEMENTS 1x         

Father and Child: Personal Analysis Essay

The first person narrative poem ‘Father and child’ by Gwen Harwood, is structured in two sections each with seven stanzas and six lines. It focuses on an individuals revolt against authority and the consequences of such an action, as well as an insinuation of the imminent death of a parent. Harwood uses persuasive and implicit means to â€Å"mirror† the loss of innocence and its effect on the sense of appreciation or acceptance of the complexities existing in the wider world. Overall, ‘Father and Child’, demonstrates the individuals pursuit of power over the authoritative figure through defiance in the form of rebellion and destruction of authority. Through this Harwood challenges widely recognised stereotypes of purity and innocence associated with young girls and has also enriched my own perception on the connection between childhood memories and their effect on shaping an individuals identity. Harwood depicts the memories of the persona in the first section, ‘Barn Owl’, where the loss of innocence due to childhood naivety is illustrated to be the foundation of the persona’s development of identity. This is shown when the persona shoots the â€Å"Owl† with the gun of the â€Å"father†, a representation of his power and authority. Here, the owl epitomizes both wisdom and authority, which the child seeks to resist. Thus in their mind, the child is destroying authority. The diction of ‘Barn Owl’, unlike its counterpart, is much simpler and holds an essence of child-like awareness, for example, the short and monosyllabic language of â€Å"Let him dream of a child Obedient,† shows the persona trying to exhibit an image of cunning and rebellion, however it is obvious to the responder that the persona is prying into complexities the she does not completely understand. As the responder I can understand the persona’s refusal of authority and therefore forgive the childish ignorance which can be relatable to anyone. The following lines where the father regains the power and instructs the persona to â€Å"End what you have begun† is a dismaying moment after which the child is shown to have lost her innocence and naivety. Corresponding use of intertextuality in the second section, â€Å"Nightfall† in which the persona seems to have grown up, creates a more profound reading of the text. This can be seen in the references to ‘King Lear’ through the designation of â€Å"Old King†, to the father as well as the direct quoting of Lear’s words, â€Å"be your tears wet? † The lateral connections between these texts allows Harwood to disregard time and context differences, and rather focus on the similar ideas being presented. In my opinion, further exploration of ‘King Lear’ reshaped my previous understanding of ‘Father and Child’, also influencing my point of view. In ‘Nightfall’ the focus of childhood memories is incorporated into the idea of the importance of relationships and the inevitability of death. The child from the previous section has matured and is shown to have grown a greater appreciation for the complexities of life and the subtleties of the relationship with her father. As it goes on, we see a reversal of roles in which the father has gained the innocence lost in the former section and the child has â€Å"grown to learn what sorrows, in the end, no words, no tears can mend’ revealing her growing wisdom. The symbolic and profound nature of this text has greatly shaped and reshaped my outlook on the importance of relationships, the inevitability of death, and the power of childhood memories. Further research, such as readings and other resources, as well as deeper exploration of this text allows many of the implicit details to be truly appreciated and understood. The relevant themes and inherent referencing of other texts allows ‘Father and Child’ to be very meaningful and enjoyable for audiences from many contexts.

Christian College Freshmen Should Make Time For A Daily Bible

College can be a very difficult adjustment for freshman to make, especially for freshmen that are believers in Christ. While the struggles and evils of the world bare down on them, students need a source of fulfillment and safety. That can be found within a daily study of the bible. Christian college freshmen should make time for a daily bible study so that they may grow closer with the Lord, get help and guidance for life, and reach a deeper understanding of what the bible says so they can defend against attacks. A daily bible study plays a major part for college freshman to grow closer to Christ. God set the bible as the main source for revealing Himself. The bible is His love letter to all humans, and by reading and studying it every day, they can start to truly understand God’s great character and His great love. God’s character is revealed within the bible’s pages; it tells of His great majesty and grandeur. If students do not dive into the word, they will m iss how holy and perfect He is. Christ’s ultimate sacrifice is also explained multiple times in the bible. He demonstrated His great love for us by dying on a cross, defeating sin, and rising from the grave. He did all of this to save His creation, so they may come live with Him. Christians who do not study the bible can take His sacrifice for granted so easily. Freshmen must understand what Christ did for them and know how great their Lord is. Students can grow closer to Christ through prayer as well. God has givenShow MoreRelatedPerceptions of Youth Towards Premarital Sex9892 Words   |  40 Pagesremain virgins until marriage. According to the Bible: â€Å"Flee sexual immorality. Every sin that a man does is outside the body; but he who commits sexual immorality sins against his own body† (I Corinthians 6:18). Some youth fall into promiscuous behavior without even, at first, recognizing just how far they have fallen. For these youths, sex is reduced to an easy source of pleasure and release, totally divorced from and marriage. Few sincere Christians would try to justify such a surrender to lustRead MoreIntroduction to Rizal Course11998 Words   |  48 Pagesall Spanish subjects and their children from prejudices associated with having Chinese surnames. Lamco married a wealthy Chinese mestiza, Ines dela Rosa and from Manila, they moved to Binan and became tenants in the Dominican hacienda which those time large portion of the town were owned by Dominican friars. Rizal’s great grandfather was Francisco Mercado, the son of Domingo and Ines dela Rosa, who married a Chinese mestiza Cirila Bernacha, had a son by the name of Juan Mercado, who married a ChineseRead More_x000C_Introduction to Statistics and Data Analysis355457 Words   |  1422 Pages Community Schools. In his spare ti me he enjoys reading and hiking. He and his wife have a daughter, Anna, who is a graduate student in Civil Engineering at Cal Tech. JAY DEVORE earned his undergraduate degree in Engineering Science from the University of California at Berkeley, spent a year at the University of Shefï ¬ eld in England, and ï ¬ nished his Ph.D. in statistics at Stanford University. He previously taught at the University of Florida and at Oberlin College and has had visiting appointmentsRead MoreImpacts of Information Technology on Individuals, Organizations and Societies21097 Words   |  85 Pagesand Infrastructure Security Impacts of IT on Individuals, Organizations, and Society Impacts of IT on Individuals, Organizations, and Society Movie Piracy Learning Objectives 17.1 Perspectives on IT Impacts 17.2 IT Is Eliminating the Barriers of Time, After studying this chapter, you will be able to: Space, and Distance Understand the changes that take place in the workplace and the lives of individuals when information technology eliminates geographical and spatial barriers. Describe someRead MoreStephen P. Robbins Timothy A. Judge (2011) Organizational Behaviour 15th Edition New Jersey: Prentice Hall393164 Words   |  1573 PagesWanda Espana OB Poll Graphics: Electra Graphics Cover Art: honey comb and a bee working / Shutterstock / LilKar Sr. Media Project Manager, Editorial: Denise Vaughn Media Project Manager, Production: Lisa Rinaldi Full-Service Project Management: Christian Holdener, S4Carlisle Publishing Services Composition: S4Carlisle Publishing Services Printer/Binder: Courier/Kendallville Cover Printer: Courier/Kendalville Text Font: 10.5/12 ITC New Baskerville Std Credits and acknowledgments borrowed from other