Monday, January 27, 2020

The graveyard book

The graveyard book A happy childhood is often described as one characterized by love, family, and a sense of security. Many adults are wont to complain that some disruptive behavior is due to some distant unfortunate event in their childhood which may have affected their coping mechanisms as they matured, a commonplace, yet unpleasant, statement widely accepted by psychiatrists. A certain question now arises in my medically inclined mind: what would psychiatrists predict for the little boy Nobody Owens? Nobody, or Bod, is the main character of Neil Gaimans The Graveyard Book, the strange yet enlightening tale of a boy who was orphaned early in life and was then adopted by a charming couple, Mr. and Mrs. Owens, who turn out to be ghosts. The story is set in the fictional village of Old Town, a sleepy little village with a dreamlike quality about it. Within this quiet stretch of land is a graveyard, now unused and abandoned. It has been turned into a nature reserve and it is in this precise location that Bod finds himself as he escapes the murderer of his family. Raised by the graveyards phantasmal inhabitants and his mysterious guardian Silas, Bod grows up into a curious and pleasant boy. He encounters ghouls, werewolves, and a monstrous slithering creature hiding beneath the hill of the graveyard. He also manages to make friends with a girl, who visits the graveyard from time to time. While he is growing up, he is taught to read, to fade through walls and slip through shadows, and other uncanny abilities. Surprisingly entertaining despite the occasional macabre and hair-raising plights, Edinger (2009) calls Gaimans creation a novel of wonderweaving a tale of unforgettable enchantment. Common themes of familial closeness and zest for life are cleverly incorporated into this masterpiece. The subtleties with which these cherished values are imparted to readers are completely endearing. While I read the book, I was entranced to the point that I could not help but nervously look over my shoulder to see if there was a ghoul-gate opening its jaws to swallow me into the dark city of Ghulheim, leading me to doubt if this truly was a childrens book. Although I generally do not favor the style which Howard (2009) describes as the episodic nature of the book, I found it completely appropriate for this tale. Since it is a childrens book, one would expect a story that can be told in chapters, thus making it easier for parents to read a portion of the story every night before bedtime. Finally, admit ting that the book was influenced by Rudyard Kiplings The Jungle Book by no means diminishes Gaimans skill in delivering this tale. For this reason, he was awarded the Newbery Medal which honors outstanding contribution to American childrens literature. Going back to my original question, I continue to wonder what conclusions psychiatrists would draw up regarding Bod. After all, his family was murdered, he was raised in a graveyard by specters, and he has been in so many frightening situations enough to terrify a full-grown man. Would they say that he would grow up to be a disturbed young man because of his experiences? Or would those same experiences have molded him to become stronger than the rest of us? Personally, I believe the love and warmth with which Bods ghost family accepted him has already made up for the loss of his real one. Whichever the case, I only make this point to show how curious I am about what Bod will ultimately become. As Gaimans daughter Maddy so nonchalantly asked after her father read her the first chapter he wrote, I, too, can only ask, What happens next? One thing is certain though, with Bods enthusiasm to live his life to the fullest, his life outside the safety of the graveyard would be peppered with new adventures and characters as elaborate and lively as those resting in his home. REFERENCES: Anonymous,.(2009,April). Childrens Book Awards 2009. Bulletin of the Center for Childrens Books,62(8),343-345. Retrieved January 24, 2010, from Academic Research Library. (Document ID:1673481801). Edinger,M..(2009,February). Raised by Ghosts. New York Times Book Review,BR.15. Retrieved January 24, 2010, from Academic Research Library. (Document ID:1647333051). Howard,E..(2009,July). Neil Gaiman.The Horn Book Magazine,85(4),351-354. Retrieved January 24, 2010, from Academic Research Library. (Document ID:1786166631). Hunt,J..(2010,January). The Graveyard Book.The Horn Book Magazine,86(1),18. Retrieved January 24, 2010, from Academic Research Library. (Document ID:1936022361).

Sunday, January 19, 2020

Frankenstein by Mary Shelley Essay -- Frankenstein Literature Dopplega

Frankenstein by Mary Shelley Mary Shelley’s Frankenstein is widely hailed as literature’s greatest gothic novel, as well as its first science fiction work. Written by a young woman in answer to a challenge from a circle of male authors (which included her husband, Percy Bysshe Shelley), the tale is drawn from her personal experiences as well as from the writings of other authors. The monster in the story is a multifaceted symbol for humanity’s fears, representing unchecked technology and the un-mothered child, among other things. As a representative of these fears, the monster itself may be described as a doppleganger. The word doppleganger is taken from the German dopplegà ¤nger, meaning â€Å"double goer.† It appears as a reflection of a person, an apparition resembling a living being. When it appears, it is often taken as a portent of death, as it was by Elizabeth I when she saw a pale vision of herself lying still upon her deathbed soon before she died (Encyclopedia Mythica, 1). On a larger scale, Frankenstein’s monster could be described as a doppleganger of humanity, personifying our fear of ourselves and of our capabilities. One classic example of a doppleganger is the reflected image seen in a window at night, sometimes mistaken for a prowler. Frankenstein’s monster acts the part of this apparition when he appears to Frankenstein in his new bride’s window on her wedding night after killing her. The doppleganger that is the monster takes on many forms in terms of what it represents. One of these is the fear of science and its role in relation to God. As scientific advancements were made in the field of medicine, questions arose as to whether or not man should try to perform acts that only God was previously capable of performing. This moral issue is initially ignored by Frankenstein, overshadowed by his zeal for accomplishing his impossible feat of reanimation. After he animates the creature and shuns it for its horrible appearance, it acts on its impulses for revenge. As the story progresses, Frankenstein realizes that he should have thought more carefully before acting, and the repercussions of his dark deed eventually lead him on a self-destructive quest to ultimately attempt to annihilate his own creation. By trying to ascend past his place in God’s universe, Frankenstein, in the end, destroys himself and all that he ever loved.... ...etheus, Adam) and destructor (Satan) of life. (Desert Aine 2, 1-2) Frankenstein and his abominable creation are two characters inexorably linked with eachother, as father and son, as inventor and invention, and even as reflections of eachother. Their conflict deals with themes of the morality of science and the fears of child birth, and their characters are drawn from a wealth of experience and reading. Shelley’s doppleganger of mankind is like a twisted vision of reality; based in some sense on reality but wildly taken out of proportion, the monster is so inhuman that it cannot reconcile itself with its master or the world of humanity. Its tragic story serves as a warning of what mankind could become as well as a reflection of Shelley’s own personal demons, and her creation has changed the face of literature. Bibliography: Desert Aine 1. 3/13/1999. 3/14/1999. http://www.desert-fairy.com/birth.shtml Desert Aine 2. 3/13/1999. 3/14/1999. http://www.desert-fairy.com/franken.shtml Encyclopedia Mythica. 3/14/1999. http://pantheon.org/mythica/articles/d/doppleganger.html Mellor, Anne K. Mary Shelley, her Life, her Fiction, her Monsters. New York: Routledge. 1988.

Saturday, January 11, 2020

Tolerance Analysis

A Comprehensive System for Computer-Aided Tolerance Analysis of 2-D†¦ http://adcats. et. byu. edu/Publication/97-4/cirp_2_7_97a. html 7. 0 ASSEMBLY TOLERANCE SPECIFICATIONS An engineering design must perform properly in spite of dimensional variation. To achieve this, engineering design requirements must be expressed as assembly tolerance limits. The designer must assign limits to the gaps, clearances and overall dimensions of an assembly which are critical to performance.Assembly tolerance limits are applied to the statistical distribution of the assembly variations predicted by tolerance analysis to estimate the number of assemblies which will be within the specifications. Designers need to control more than just gaps and clearances in assemblies. Orientation and position of features may also be important to performance. To be a comprehensive design tool, a tolerance analysis system must provide a set of assembly tolerance specifications which covers a wide range of common des ign requirements. A system of assembly tolerance specifications patterned after ANSI Y14. 5 has been proposed [Carr 93].Those ANSI Y14. 5 feature controls which require a datum appear to be useful as assembly controls. However, there is a distinct difference between component tolerance and assembly tolerance specifications, as seen in Fig. 9. In the component tolerance specification shown, the parallelism tolerance zone is defined as parallel to datum A, a reference surface on the same part. By contrast, the assembly parallelism tolerance defines a tolerance zone on one part in the assembly which is parallel to a datum on another part. In order to distinguish an assembly tolerance specification from a component specification, new symbols have been proposed.The feature control block and the assembly datum have been enclosed in double boxes. Fig. 9 Comparison of component and assembly tolerance specifications. 8. 0 MODELING PROCEDURES AND RULES The ability to model a system is a funda mental skill for effective engineering design or manufacturing systems analysis. Unfortunately, few engineers know how to construct variational models of assemblies beyond a 1-D stack. This is primarily because the methods have not been established. There is little treatment of assembly modeling for tolerance analysis in engineering schools or texts.Until engineers learn how to model, tolerance analysis will never become widely used as have other CAD/CAE tools. A consistent set of modeling procedures, with some guiding rules for creating vector assembly models, allows for a systematic approach which can be applied to virtually any assembly. The steps in creating a model are: 1. Identify the assembly features critical to the assembly. Locate and orient each feature and specify the assembly tolerances. 2. Locate a datum reference frame (DRF) for each part. All model features will be located relative to the DRFs. 3.Place kinematic joints at the points of contact between each pair of ma ting parts. Define the joint type and orient the joint axes. These are the assembly constraints. 4. Create vector paths from the DRF on each part to each joint on the part. The paths, called datum paths, must follow feature dimensions until arriving at the joint. Thus, each joint may be located relative to the DRF by controlled engineering dimensions. 5. Define the closed vector loops which hold the assembly together. The datum paths defined in Step 2 7 of 14 5/11/2011 4:27 PM A Comprehensive System for Computer-Aided Tolerance Analysis of 2-D†¦ ttp://adcats. et. byu. edu/Publication/97-4/cirp_2_7_97a. html become segments of the vector loop. A vector loop must enter a part through a joint and leave through another joint, passing through the DRF along the way. Thus, the vector path across a part follows the datum path from the incoming joint to the DRF and follows another datum path from the DRF to the outgoing joint. 6. Define open vector loops to describe each assembly tolera nce specification. For example, for an assembly gap, the loop would start on one side of the gap, pass through the assembly, and end at the other side of the gap. 7.Add geometric variations at each joint. Define the width of the tolerance zone and length of contact between the mating parts as required. The nature of the variation and direction is determined by the joint type and joint axes. Other variations, such as position, may be added at other feature locations. Modeling rules are needed to ensure the creation of valid loops, a sufficient number of loops, correct datum paths, etc. For example, an important set of rules defines the path a vector loop must take to cross a joint. Each joint introduces kinematic variables into the assembly which must be included in the vector model.Fig. 10 shows the vector path across a 2-D cylinder-slider joint. The rule states that the loop must enter and exit the joint through the local joint datums, in this case, the center of the cylinder and a reference datum on the sliding plane. This assures that the two kinematic variables introduced by this joint are included in the loop, namely, the vector U in the sliding plane and the relative angle f at the center of the cylinder, both of which locate the variable point of contact in their corresponding mating parts. Fig. 11 shows a similar vector path through a 3-D crossed cylinders joint.A more complete set of modeling rules is described in [Chase 94]. Fig. 10: 2-D vector path through a joint Fig. 11 3-D vector path through a joint 9. 0 MODELING EXAMPLE The process of creating an assembly tolerance model for analysis is illustrated in the figures below for a seatbelt retraction mechanism. The device is an inertial locking mechanism for the take-up reel. One of the critical assembly features is the gap between the tip of the locking pawl and the gear, as shown in Fig. 12. The assembly is of reasonable complexity, with about 20 dimensional variations and several geometric variati ons as contributing sources.The contribution by each variation source depends on the sensitivity of the gap to each component variation. Fig. 13 shows the DRFs for each part and local feature datums which define model dimensions. 8 of 14 5/11/2011 4:27 PM A Comprehensive System for Computer-Aided Tolerance Analysis of 2-D†¦ http://adcats. et. byu. edu/Publication/97-4/cirp_2_7_97a. html Fig. 12 Example 2-D assembly Fig. 13 Part DRFs and feature datums. In Figure 14, the kinematic joints defining the mating conditions are located and oriented. Clearance in the rotating joints was modeled by two methods.In the first case, the shafts were modeled as revolute joints, centered in the clearance, with clearance variation added as an equivalent concentricity. In the second case, the CAD model was modified so each shaft was in contact with the edge of the hole, modeled by parallel cylinder joints, and variation was determined about this extreme position. After the joints have been locat ed, the assembly loops can then be generated, as shown in Fig. 15. To simplify the figure, some of the vectors are not shown. Fig. 14 Kinematic joints define mating conditions. Fig. 5 Vector loops describe assembly. Models for geometric variation may then be inserted into the vector assembly model, as shown in Fig. 16. The completed CATS model, in Fig. 17, is ready for assembly tolerance analysis. 9 of 14 5/11/2011 4:27 PM A Comprehensive System for Computer-Aided Tolerance Analysis of 2-D†¦ http://adcats. et. byu. edu/Publication/97-4/cirp_2_7_97a. html Fig. 16 Geometric variation sources are added. Fig. 17 The completed CATS model. Figure 18 show a 3-D CATS model overlaid on a swashplate cam and follower mechanism. Fig. 18 3-D CATS model. 10. 0 TOLERANCE ANALYSISThe analysis approach used within the CATS system is based on linearization of the assembly equations and solution for the variations by matrix algebra. A detailed description with examples may be found in [Chase 95, 96] and [Gao 97]. The linearized method provides an accurate and real-time analysis capability that is compatible with engineering design approaches and tools. Vector assembly models can be used with any analysis system. Gao used the CATS Modeler as a graphical front end for 10 of 14 5/11/2011 4:27 PM A Comprehensive System for Computer-Aided Tolerance Analysis of 2-D†¦ http://adcats. et. byu. du/Publication/97-4/cirp_2_7_97a. html a Monte Carlo simulator [Gao 93]. An iterative solution was used to close the vector loops for each simulated assembly. Histograms for each assembly feature being analyzed were generated from the computed assembly dimensions. A comparison of the linearized approach with Monte Carlo analysis is presented in [Gao 95]. 11. 0 CAD IMPLEMENTATION Fig. 19 shows the structure of the Computer-Aided Tolerancing System integrated with a commercial 3-D CAD system. The CATS ® Modeler creates an engineering model of an assembly as a graphical and symbolic overla y, linked associatively to the CAD model.Pop-up menus present lists of joints, datums, g-tols and design specs to add to the CAD model. The model is created completely within the graphical interface of the CAD system. There are no equations to type in to define mating conditions or other assembly relationships. CATS is tightly integrated with each CAD system, so it becomes an extension of the designer's own CAD system. Current CAD implementations include: Pro/ENGINEERa (TI/TOL 3D+), CATIAa, CADDS5a, and AutoCADa; (AutoCATS). Fig. 19 The CATS System Architecture The CATS Analyzer accesses the assembly tolerance model that was created and stored in the CAD system.The Analyzer has built-in statistical algorithms to predict variation in critical assembly features due to process variation. It features built-in algorithms for tolerance synthesis, which re-size selected tolerances to meet target assembly quality levels. Matrix analysis gives instant feedback for any design iteration or â⠂¬Å"what-if† study. The user interface is standard XWindows Motif, with multiple windows, scroll bars, pop-up menus, dialog boxes, option buttons, data fields and slide bars for data entry, etc. The designer is in complete control of the tolerance analysis/design process.Graphical plots give visual feedback in the form of statistical distributions, ranked sensitivity and percent contribution plots. Engineering limits are shown on the distribution, with corresponding parts-per-million reject values displayed. The current status of the CATS Modeler and Analyzer, with respect to ease of use by an interactive graphical user interface and internal automation are summarized in Table 1 and Table 2. Table 1. Current status of assembly modeling CAD implementation Modeling Task Graphical Automation Level 11 of 14 5/11/2011 4:27 PM

Friday, January 3, 2020

The Model Of Economic Growth Based On Production Functions

2. The model of economic growth based on production functions (the Welfens/Jasinski model and its modifications). To show how FDI influence economic growth of a particular country a model proposed by P.Welfens and P.Jasinski is used. It is based on traditional production functions. In general the production functionsof Welfens and Jasinski describing the economic growth in the recipient country can bedefined by the following equation[61, p.254]: (1.9) where â€Å"Y† is an output (GDP or GNP); â€Å"K† is fixed assets of local origin (domestic fixed assets); â€Å"H† is fixed assets of foreign origin (foreign fixed assets); â€Å"L† is the number of employed in the national economy; â€Å"z† is the rate of technological progress; â€Å"ÃŽ ²Ã¢â‚¬  is statistically evaluated†¦show more content†¦Secondly, in the basic structure of the production function (1.9) proposed byWelfens and Jasinski, domestic fixed-capital and foreign investmentsare supposed to be equally effective, which, as mentioned above, contradicts the observed facts. Thirdly, the production function of Welfens/Jasinski includes multiplier of scientific and technological progress, which depends on the overall macroeconomic situation and in no way connected with the inflows of FDI. At the same it is obvious that foreign investment primarily perform the function of transferring technological and managerial innovations to the economies of the recipient countries.If we take into consideration the institutional changes in the economy, then they should also reflect the effects related to the openness of the national economy to foreign investments from abroad. Fourthly, a set of the factors that affect the rate of scientific and technological progress inShow MoreRelatedThe Long Run Causality Direction Between Financial Markets Development And Economic Growth1716 Words   |  7 PagesThis thesis investigates the long-run causality direction between financial markets development and economic growth in Croatia, Slovenia, Serbia and China for varying time periods using VAR models and Granger Causality methods. It also explores the interrelationships between variables using the Impulse Response Function. 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