An Sociological And Psychological Aspects Of The...

Describe communication, evaluate the stages of the communication process and assess the key aspects of each process. Evaluate the importance of successful communication and explain how interference can affect communication by using one of the communication models by looking at the impact communication had on the receiver, explaining factors like Source, Nature, Level, Time, Frequency, Use, Form and Type. Critically evaluate the sociological and psychological aspects of modern communication methods. Describe advantages and disadvantages of the modern communication methods and how the introduction of conferencing, computer, teleworking and other new technologies have affected society both sociologically and psychologically Evaluate the key†¦show more content†¦Thirdly there will be a critical evaluation of the sociological and psychological aspects of modern communication, looking at how the introduction of new communication technology has altered society. The Shannon-Weaver communication model represents communication between a sender and receiver, it was the first model for communication theorised. It is composed of the following stages: sender, encoding, channel, decoding, receiver, and feedback. There is an additional factor that can distort communication, which is noise. In 1948, when Shannon and Weaver s The Mathematical Theory of Communication was published, noise represented interference on a telephone line. Today however, noise is a metaphor for any form of interruption during the communication process. A sender wanting to send a message must first encode it in a meaningful form for the receiver. Encoding is the translation of an idea or concept into a message, it is one of the key stages in the communication process. The sender must be cognisant of the receiver s knowledge and use symbols understandable to the receiver. These symbols may be verbal or non-verbal, examples of which are words and gestures. Improper encoding is a barrier to communication as it will inhibit the decoding of the message and distort the information. An example of poor encoding would be an advertisement using the same message throughout multiple countries in which some words

Alum Synthesis Free Essays

Alum Synthesis: The Chemical Process of Recycling Aluminum Introduction By recycling aluminum cans, the costs and energy savings are dramatically more resourceful and efficient than producing aluminum from what it is naturally found in, bauxite ore. The process of recycling aluminum to produce potassium aluminum sulfate, a common alum, will be done through a serious of chemical reactions. Through this reaction, percent yield will be determined. We will write a custom essay sample on Alum Synthesis or any similar topic only for you Order Now Materials and Methods The mass of a 250 mL beaker is measured, and . 9 to 1. 2 grams of aluminum can pieces are added to the beaker. The mass of the beaker and aluminum pieces is recorded. These two masses are then used to determine the initial mass of aluminum being reacted in this experiment. 50 mL of 1. 4 M KOH is then added to the beaker and placed upon a hot plate under a fume hood to fumigate any escaping gases during the reaction, which should take no longer than 30 minutes. The heat from the hot plate speeds the reaction, and the reaction mixture must be kept no lower than 25 mL by adding distilled water. An aspirator is assembled by using a suction flask, clamp, ring stand, rubber tubing, funnel, and filter paper to filter the reaction mixture once the first reaction is complete. Feature Article –  Free-Radical Bromination The filter paper is then wetted, the vacuum source is turned on, and the mixture is poured through the filter, using 5 mL of distilled water to rinse the beaker. The filter will catch all the dark filtrate from the aluminum can pieces, and the suction flask will contain a clear (transparent) solution. The solution is then transferred to a clean 250 mL beaker, and the suction flask is rinsed with 10 mL distilled water to insure all the remaining solution is transferred to the clean beaker. The beaker is placed in an ice bath to cool the solution, filling the beaker three fourths full with ice and cold water. 0 mL of 6. 0 M sulfuric acid is measured and slowly added to the mixture, using a stirring rod to mix. Heat the mixture on a hot plate if any solids begin to develop in the mixture. Using a 1 L plastic beaker, prepare another ice bath and place the beaker containing the reaction mixture in the ice bath. Once in the ice bath, the alum crystals forming in the mixture will begin to p recipitate. To help the process of crystal formation, use the stir rod to scrape the sides of the beaker and form an alum seed crystal. Reassemble a clean vacuum filter, and filter the crystals onto the filter paper. Get as much of the precipitated crystals out of the beaker and then rinse the beaker twice with 10 mL of 50% ethanol solution to transfer all the crystals to the beaker. Once the alum crystals have dried, measure the mass of a clean 250 mL beaker and then measure the mass of the beaker containing the alum crystals. Results and Discussion The first reaction to begin the alum synthesis process is when aluminum and potassium hydroxide are combined and water and heat are added during the reaction. The result is an ion called â€Å"aluminate† with an excess of hydrogen gas. This type of reaction is a redox (reduction-oxidation) reaction, where the aluminum metal is oxidized to aluminum with an oxidation number of +3 and the hydrogen in potassium hydroxide or in water is reduced from an oxidation number of +1 to zero in hydrogen gas. The balanced chemical equation for this reaction is: 2Als+ 2KOHaq+ 6H2Oliq2KAlOH4aq+ 3 H2g During this reaction, the colorless mixture potassium hydroxide and aluminum pieces turned a dark, ashy gray as heat was applied and the aluminum can pieces dissolved. The heat sped the reaction, and within thirty minutes all the aluminum pieces were dissolved, leaving behind aluminate. In the second reaction, the filtered aluminate solution is mixed with sulfuric acid once the solution has cooled. After stirring for several minutes, crystals began to form. The crystalizing liquid started thickening and appeared to be white. The product of this reaction is aluminum hydroxide, potassium sulfate, and water. The fully balanced chemical equation is: 2 KAl(OH)4(aq) + H2SO4(aq) 2Al(OH)3(s) + 2 H2O(liq) + K2SO4(aq) This equation represents a metathesis (precipitation) reaction where all the elements and groups recombine and a precipitate, aluminum hydroxide, is formed. As more sulfuric was added, the precipitate began to dissolve, thus causing the third reaction. The solution contains aluminum, potassium, and sulfate ions now. The balanced chemical equation is: 2 Al(OH)3(s) + 3 H2SO4(aq) Al2(SO4)3(aq) + 6 H2O(liq) This type of reaction is a metathesis (acid-base) reaction where, once again, the elements and groups recombine themselves. The product of this reaction is aluminum sulfate and water. The solution continued to cool and crystals began to form. The last reaction resulted in a hydrated potassium aluminum sulfate, and crystals of this compound formed slowly. Seed crystals† developed and more alum deposited causing the crystals to expand. The balanced chemical reaction is: Al2(SO4)3(aq) + K2SO4(aq) + 24 H2O(liq) 2 KAl(SO4)2†¢12 H2O(s) This would be considered a combination reaction because the three reactants combined to form one product, hydrated potassium aluminum sulfate. The overall balanced chemical reaction for this experiment is: 2Al(s)+2KOHaq+4H2SO4(aq)+22H2O(liq) 2 KAl(SO4)2†¢12H2O(s) + 3 H2(g) At the start of the experiment, 1. 01 grams of aluminum can pieces were used. After forgoing several reactions, 4. 19 grams of alum were recovered. Theoretically, 17. 76 grams of alum should have been recovered. This gives a percent yield of 24. 0%. Human error was definitely the main factor as to why the percent yield is not anywhere close to 100%. My lab partner and I did have a misunderstanding with one of the steps in the instructions; instead of placing the beaker in an ice bath during reaction three, we thought the directions said to put ice directly into the reaction mixture. This may have caused some error in the cooling process of the mixture, and may have not enabled all the crystals to form properly. We may have also not waited long enough for all the crystals to form. Also, some of the crystals may have gotten lost while being transferred from the beaker, to the aspirator, and then to another beaker to be measured. These factors are reasonable as to why the actual yield of alum that resulted in the experiment were not accurate with the theoretical yield of alum. Conclusion Through a series of reactions, it is understood that aluminum can be chemically reacted to result in the synthesis of alum. The success of the experiment proves the reasoning of the process of recycling aluminum. How to cite Alum Synthesis, Essay examples

Evidence, First Movement Words and Things Essay Example For Students

Evidence, First Movement: Words and Things Essay The perfect photoplay leaves no doubts, offers no explanations, starts nothing it cannot fi nish. — Henry Albert Phillips, The Photodrama (1914) The technical structure of the archiving archive also determines the structure of the archivable content even in its very coming into existence and in its relationship to the future. The archivization produces as much as it rec ords the event. — Jacques Derrida, Archive Fever (1998) In the beginning there is a word. That word is â€Å"Hà ¤xan.† Benjamin Christensen’s biblical echo is intentional. From the fi rst frame of Hà ¤xan, Christensen is seeking to dismantle the conventional cinematic image. This is an image of a word. In light of what is to follow, the formal conventions of the silent fi lm by defi nition destabilize any easy relation to the object â€Å"Hà ¤xan†; it exists multiply. Already reaching into his source material, Christensen borrows Italian inquisitor Zacharia Visconti’s categories of language to show us how the word relates to meaning, expressed in the distance between the thing and the thing signifi ed. Visconti designated this â€Å"the language of the voice,† the language proper to humans. Yet, in a silent fi lm there is no obvious voice. Certainly, a printed word occupies the domain of language for Visconti, but for this to be formally consistent the word requires the syntax that would allow the reader to insert her inner voice, the memory of a voice, in order to make this so. â€Å"Hà ¤xan† appears to lack this syntactic force at this opening instant to be properly a statement. â€Å"Hà ¤xan†Ã¢â‚¬â€ the witch— appears to be an impossible object. In Visconti’s schema, this word also appears to speak â€Å"the language of the mind.† This is a language the inquisitor reserves for angels, a language resulting in nonstatements. From the very beginning, there is no claim made about the witch—no question is asked. The witch is simply announced. In an instant, â€Å"Hà ¤xan†Ã¢â‚¬â€ the witch—is there and this is all. â€Å"Hà ¤xan† is si mul ta neously a word, an image, and a thing. Benjamin Christensen mak es every effort to craft a witch that is real to us. It is a grand ambition. Playing with the ontological fl uidity of a cinematic image, the director expresses himself through an image- world that seems entirely of his own creation. â€Å"Hà ¤xan† in the opening moment of the fi lm is a monad, containing the totality of this world in its most basic ele ment. Not just a word, the Word. Visconti reserved this language, â€Å"the language of things† to God alone; yet for scientists and fi lmmakers, it is the language of things that holds the greatest appeal. To the World a Witch Christensen’s fi rst task is to open the world of the witch to the fi lm’s audience. He does this by immediately following the word with a preposition, albeit still denying us the calming language of voice that is proper to us. This preposition, denoting both agency and possession, comes in the form of a face. His face. The commanding, scowling face of the director stares out at the camera. Christensen’s fi lm will make full use of this art of metoposcopy. Dating back to Girolamo Cardano and the Re nais sance, metoposcopy defi ned the operation of reason as the weaving together of images in the mind. In turn, the expression of reasoning was to be found on the face (a protocinematic theory of the relation between image and thought if ever there was one).2 Christensen’s face is one of many revealed; these faces—of the old woman, of the ecstatic nun, of the novice sorceress— will be offered as primary evidence of the power of the witch and the l ogic of demonological thinking. It is telling that Christensen’s face is the fi rst shown, not in order to place his seal of authorship, but as a way to assert to his audience that it is his argument that resides in the foreground. This is no ordinary fi lm. It is not merely entertainment. Hà ¤xan is a thesis.After this dramatic beginning, Christensen provides some immediate reprieve through a scarcely noticeable addendum to the opening title card: â€Å"A pre sen ta tion from a cultural and historical point of view in seven chapters of moving pictures.† Claiming a reassuring authority, Christensen now signals that he intends to enlighten us in the manner of a professor giving a lecture. The technology of the motion picture is not simply a medium here; in the ser vice of Christensen’s thesis, it is a precise, deliberate method. The title cards that follow identify the director, the cinematographer, and turn the audience’s attention toward the list of sou rces for the fi lm distributed as part of the original program (which has been reproduced in the back matter of this volume). Like any respectable scholar, Christensen indexes himself through his sources. Yet his mode of citation is unambiguously rooted in the formal elements of cinema and the image rather than texts, and is ultimately put to different uses from that of the historian or human scientist; this difference will constitute the focus of our own analy sis in this chapter, as we move through his textual materials and the production of his images shot by shot. In short, Christensen makes sure the audience knows that it took three years to research and produce his visual thesis. As with the word and the face, this is stated abruptly for the benefi t of context. More title cards follow, fi lled with an authoritarian, fi rst- person tenor. Lacking any established provenance for a voice- of- God tone that would only later become standard in the Griersonian documentary mode of the 1930s, Christensen takes it upon himself to invent this voice. The common suggestion that Luis Buà ±uel fi rst generated thi s instrumentally impersonal tenor in Land without Bread (Tierra Sin Pan, 1933) is off by a full de cade, ignoring the fact that silent fi lms were anything but silent.3 The director begins in this voice by establishing the witch as a chapter within a much longer constellation of practices, discourses, traditions, and institutions. This is empirically correct, as scholars from Gaston Maspero to Stuart Clark have emphasized in their own studies of the witch.4 Among many others, Richard Kieckhefer has demonstrated how the long history of practical natu ral magic was enfolded into the specifi city of Eu ro pean witchcraft in the late Middle Ages.5 These fi ndings have only taken root in the historical debates on witchcraft since the 1970s, which Christensen anticipates by some fi fty years. It is at this point in Hà ¤xan that Christensen gives us an image of the witch. It is a well- known woodcut that fi rst appeared in Ulrich Molitor’s Von den Unholden oder Hexen (1489), at the dawn of the witch hysteria in Eu rope, depicting two women feeding a boiling cauldron. Many of the ste reo typical visual characteristics of the witch are not yet established: the age of the women is diffi cult to determine and they are far from the withered old crones we see later in Albrecht Dà ¼rer and Hans Baldung Grien.6 Yet they are unmistakably witches. Their boiling brew evaporates into the air, appearing to cause a storm. Drawing on a trope that wo uld instantly signify â€Å"the witch† from Shakespeare’s Macbeth to the pre sent, Christensen introduces the viewer to the subjects of his fi lm via a classic example of the malefi cium that people greatly feared from witches in the early modern period. Christensen carefully limits what we can see of this image, narrowing the visible edges of the shot into a severe vertical line bisecting the screen. The shot is abrupt, barely onscreen for a few seconds before the intertitles return. Our focus is taken to the statement that primitive men â€Å"always† confront the inexplicable with tales of sorcery and evil spirits. This is obvious hyperbole, but not entirely out of step with the evolving scientifi c explanations of the time regarding the origins of human society. Echoing E. B. Tylor’s argument that civilization always begins with the imaginative, superstitious responses of humans to a world they do not yet understand, Christensen then shifts to consider the power of belief.7 Hà ¤xan at this stage appears to be aspiring to Max Mà ¼ller’s dream of presenting an objective, empirical â€Å"science of religion.† 8 Interestingly, the next image takes us to â€Å"imaginary creatures† thought to cause disease and pestilence in ancient Persia. A row of six human– animal hybrids confronts the viewer. Christensen immediately divulges his sources for this claim, citing Rawlinson9 and Maspero10 as authorities that trace the Eu ro p ean belief in witches back to antiquity. Several shots of monstrous hybrid demons, drawn from Maspero, follow. Christensen is operating in a fi rmly rationalist mode here, linking these monsters to â€Å"naà ¯ve notions about the mystery of the universe† held by ancient people. A re- creation of Egyptian astrological notions of the nature of the world immediately follows. This is the fi rst explicit set to appear in Hà ¤xan, depicting (according to Maspero’s information, the intertitle asserts) a world of high mountains, stars dangling from ropes, and a sky supported by strong pillars. A nameless assistant out of frame helpfully draws the viewer’s attention to the im por tant details. As with any Universalist approach, Christensen traverses time quickly in the pre sen ta tion of his thesis. No sooner have we glimpsed this scale model of the Egyptian cosmos than we are catapulted into the folklore of early modern Eu rope. Perhaps the singular feature of the witch craze in Eu rope is bluntly stated when Christensen informs us that the generalized evil spirits of ancient times are transformed into dev ils by the fourteenth century. Cutting from one to another, four iconic images of dev ils par tic u lar to the period fl ash across the screen, the fi lm stock tinted an ominous, rusty red to heighten the effect. These dev ils lived at the earth’s core, Christensen tells us, with the earth believed to be a stationary sphere in space surrounded by layers of air and fi re. Beyond the fi re lay moving celestial bodies, ceaselessly rotating around the earth with the fi xed stars far above and, â€Å"in the tenth crystal sphere,† sits the Almighty and His angel s, keeping the whole celestial system in motion. Intercut title cards offer explanation before Christensen helpfully reveals a working model of this cosmology, in this case drawn from Hartmann Schedel’s Liber Chronicarum,11 slowly pulling back the iris to reveal the medieval universe that he is has described. This moving repre sen ta tion of a terra- centered universe resembles the elaborate wonders found in Baroque wunderkammer meticulously assembled by the German elite at the time. It is an effective use of parallel editing to bring this lecture, delivered in text, to life in a visual manner. Albrecht Durer Quotes EssayWhen documentary was not yet documentary (but then fi ction wasn’t fi ction yet either), when the medium was mute and each fi lm ran only a minute or two, moving pictures hardly amounted to more than a miscellany of visual tidbits, which made no demands on literacy and thus spread easily and rapidly far and wide. The world on the screen exerted a magical attraction but remained anecdotal and predominantly iconic. In terms of public discourse, it was practically inarticulate, other than to reinforce already ste reo typical images or create some new ones; in short, intensely fascinating but apparently ill- adapted to serving intelligent purposes. It is not as though scientists, journalists, and others devoted to making nature speak did not give fi lmmaking a try. In the waning years of the nineteenth century, anthropologists such as Alfred Cort Haddon, Walter Baldwin Spencer, and Frank Gillen were already using the new technology to fashion, with mixed success, proto- ethnographic fi lms. Charles Urban founded the Unseen World series in 1903, merging the technologies of the microscope and the cinematograph to attempt to unlock the secrets of nature at its most minuscule level. Films such as Attack on a China Mission Station (1900), Hunting Big Game in Africa (1907), and With Captain Scott, R.N., to the South Pole (1912) sought to bring the immediacy of news headlines to life onscreen. State- sponsored war propaganda generated during the First World War, including The Battle of the Somme (1916) and With Our Heroes at the Somme (Bei unseren Helden an der Somme, 1917) mutated the desire to see far- off contemporary events throug h visual meaning- making machines that demanded not only attention but belief. The fact that these fi lms nearly always made this demand by staging, as real, reenactments of purportedly real events only added to the early suspicion of cinema’s ability to convey unvarnished, objective facts.31 Even for fi lms not surreptitiously staged, the reliance on actualities of iconic clichà ©s, giving the viewer what they largely expected to see, proved to be a serious prob lem for those who wished to convey the complexity and depth of the world and of nature.32 The issue, widely discussed well before John Grierson’s proclamation of the â€Å"documentary value† of Robert Flaherty’s Moana in 1926, concerns the relation between a fragmentary visual artifact drawn â€Å"from life† and the truth value of any such fragments. Ultimately, this issue hinges on mimesis. What sorts of fi lmmaking practices can felicitously mimic life as such? Grierson’s own elaboration of documentary recognizes this in asserting that the fi lmmaking form is the â€Å"creative treatment of actuality.† Grierson was not the fi rst to conceptualize the matter in this way, as Brian Winston shows that the Polish writer Boleslaw Matuszewski stated the issue in these same terms as early as 1898.33 Crucially, mimesis was not only permissible for writers such as Matuszewski and early documentarians such as Edward Curtis; it was indispensible in the creation of valuable documentary works. Thus, a fi lm such as Curtis’s In the Land of the War Canoes (a.k.a. In the Land of the Headhunters, 1914) adhered to prevailing standards of expressing the real not despite its status as a reenactment but because of it. The truth of Kwakiutl (Kwagu’ł) life is evident through the spirit of Curtis’s expert cinematic expression of what that life is, just as the reality of war was only truly evident to viewers through gaining a sense of the fi ghting as re- created in other wise opposing accounts of the truth in the British and German Somme fi lms.34 Later accounts by fi lm historians positing â€Å"fact† and â€Å"fi ction† as oppositional binaries arising out of the earliest approaches to fi lmmaking were further exemplifi ed by pitting the â€Å"realist† Lumià ¨re against the â€Å"fanciful† Mà ©lià ¨s within a crypto- structuralist origin myth that falsely represented what â€Å"documentary† meant to pre- Griersonian fi lmmakers.35 The â€Å"ahuman† witness of the camera is not enough, as this merely produces a blind sight that cannot, on its own, educate, enlighten, or even fully rec ord the real in any ideal manner. This is not the fi rst time that the gap between witnessing and the real has erupted in Eu ro pean history. As Hà ¤xan demonstrates, the question of evidence occupied inquisitors and theologians long before the invention of cinema. Playing on the fact that, while the traces serving as evidence are quite different, a larger ontological issue binds them across the cent uries, Christensen takes the unique tack of assuming the role of the art historian in this opening section of the fi lm. This is a risky strategy, particularly given the static nature of the materials on display, but it does allow Christensen to shift the locus of the empirical to the materiality of images accepted as historical. Taking up this position in the opening chapter of Hà ¤xan also allows Christensen to have it both ways, in that he can si mul ta neously confront the viewer directly in the manner of an earlier cinema of attractions while also preparing viewers for the â€Å"diegetic absorption† that was coming to dominate the grammar of cinema in the 1920s.36 Given the impossibility of fi lming witches several centuries â€Å" after the fact,† Hà ¤xan creates pre sent- day empirical images from artifacts of the time. Yet this analytic position does not guarantee that the images will be â€Å"brought to life† in any way. To the contrary, the vivisection of the historical image would tend to produce the same outcome that any vivisection would: death or deformity. Thus the risk, quite evident throughout the fi rst chapter of the fi lm, is that the presumed pastness of these images, their â€Å"deadness,† will subvert the appearance of life that distinguishes cinema from ot her visual forms such as photography, painting, and printmaking. How well Christensen is able to elide this deadness is open to debate; undeniably, many viewers experience the opening minutes of the fi lm as a plodding exhibition of â€Å"pictures of pictures.† This reaction notwithstanding, the strategy of â€Å"reimaging† is methodological and intentional, an ac know ledg ment on Christensen’s part that for a very long time â€Å"knowledge† in Eu ro pean terms consists fi rst and foremost of â€Å"recitations of the known.†37 While the opening chapter of Hà ¤xan may test the patience of the viewer, the logic of Christensen’s visual strategy in this section becomes clearer as the fi lm progresses. The director is laying a foundation for what comes next, though he is quite sensitive to the fact that a visual thesis demands a different relation to its sources. Thus, the parade of classic visual works in this opening section provides the ground not only for the arrangement of a thesis but also for the creat ion of new images, constituting its own evidence for what is at stake. Christensen accomplishes this by continually triangulating between paintings and woodcuts, photographs, and cinematic dramatization. This movement between formally distinct media at times more fi rmly aligns Christensen with those who affi rm that â€Å"nonfi ction† is a designation determined by techniques of pre sen ta tion rather than simple content, including art historian Aby Warburg, fi lmmaker Chris Marker (particularly in reference to his famous 1962 â€Å"fi lm of photographs,† La Jetà ©e), and the recent photography of Jeff Wall, Cindy Sherman, and Hiroshi Sugimoto, much more than with his own contemporaries in the cinema of the 1920s.38 There are also echoes in Hà ¤xan of the creative displacements effected through Soviet montage and the use of fragments of found footage to assem ble a singular work, with Esfi r Shub’s fi lm The Fall of the Romanov Dynasty (1927) being the most obvious example.39 Hà ¤xan, not having access to archival footage for obvious reasons, nevertheless re- pre sents the documents of the visual archive of the witch in a manner recalling the methods of Shub and other Soviet fi lmmakers such as Dziga Vertov. In formally similar fi lms like Harun Farocki’s As You See (Wie man sieht, 1986) and Images of the World and the Inscription of War (Bilder der Welt und Inschrift des Krieges, 1989), the â€Å"truth† gained by the reproduction of archival images is unlocked only through their mobility in the context of their new use.40 As with Farocki, Christensen does not seek to embellish such visual artifacts in citing them, but rather empties them out, expressing through their pree stablished frame a meaning that was hidden, resisted, or not even in ven ted at the time of their origins. Understood in this way, the disconcerting effect of the opening chapter becomes more plausible, as Hà ¤xan disrupts what the audience can expect from the fi lm. While the medium of expression is undoubtedly modern and allows for these uniquely moving images, the method Christensen deploys helps to cultivate a position that draws authority from an expertise based on the interweaving of the artistic and the scientifi c rather than an ideal â€Å"scientifi c self† premised on the polarization of the two.41