Fitness Market Analysis Essay Example for Free

Fitness Market Analysis Essay Industry/market Industry: How many fitness centers? What’s their revenues? Profit margins? Is it growing? Concentrated or not? Market: PMB, attendance, consumer spending, Statistics Canada (average spending) General Trends: Growing? Health trends? Key Competitors: other popular gyms in the area (Nautilus, Progym, energy cardio) The Fitness Market The fitness market is very large and keeps growing. This market is targeted at anyone who wants to be in shape and is looking to live a healthier lifestyle. In 2009, consumers spent on average 186$ on fitness facilities and the median expenditure per household was 390$. We notice a positive trend of fitness center attendance during the past 10 years. Since 2003, there has been an increase in participating in a physical activity throughout the population of Quebec. Even though this change is small, it is a good indicator that people are looking to workout more. If we notice other health behaviours in Quebec we will notice the same positive trend of wanting to live a healthy lifestyle. There has been a drop in the smoker population: dropping from 26.4% in 2003 to 23.8% in 2010. People are also consuming more fruits and vegetables (5 times a day) an increase from 45.4% to 51.1% (2003-2010). Even the population’s life expectancy increased by 2 years to 81 from 2003 to 2008. All these statistics give us a good understand of our population’s health behaviours allowing to conclude that that the fitness center market has a high potential for profit because people are looking to stay fit and live healthier and longer.

Of Mice and Men the Relationships Essay Example for Free

Of Mice and Men the Relationships Essay How does Steinbeck present the relationship between George and Lennie in this chapter? The author John Steinbeck presents the relationship between the two characters, George and Lennie in different ways as they are both different characters and have different personalities. He presents it like a parent and child relationship, with George being the parent and Lennie the child. As soon as the reader is introduced to George and Lennie Steinbeck tells us that, â€Å"They had walked in single file down the path†. This immediately notifies the reader of the kind of relationship between George and Lennie, it does this by stating â€Å"single file†. This reminds us of a game called follow the leader. It also tells us that the person at the front (George) is responsible and the leader. We can also see this idea on page five. When George says, â€Å"I ain’t sure it’s good water†. This again portrays the idea of George being the responsible, as he has to tell Lennie this and Lennie can’t tell himself. It also shows us that George is concerned over Lennie’s health. This implies that George has feelings for Lennie. We again see the idea of Lennie being like a child when on page sixteen he wants a story told to him again. This tells us Lennie is child like because this situation is like a parent reading a child a bedtime story. After drinking from the pool, when they are sat on the hill Lennie imitates George’s actions â€Å"he pulled his hat down a little more over his eyes the way George’s hat was.† Our immediate interpretation is that Lennie looks up to George as a role model, the quote â€Å"way George’s hat was† suggests he acts just like him and mimics him how a son would to a father. We also notice that Lennie tries to be clever towards George to show that he is smart even though he is not, â€Å"he said cleverly†. We can see throughout chapter one that George several times feels sorry for Lennie. the phrase â€Å"poor bastard† not only tells that there is a sense of sympathy from George in the relationship, but it also sort of makes the reader feel sorry for Lennie, Steinbeck also implies this through stating that George â€Å"looked ashamedly at the fire†. I could also notice when I was reading through the first chapter that George has a sense of authority over Lennie, â€Å"you gonna get that wood†. This is like a parent telling a child to do his chores. On some occasions though George shows a bit of hatred towards Lennie, he thinks of what he could have if Lennie wasn’t around and contrasts that with George. There is also a sense of lack of trust in the relationship  between the two men. We see this through the predicament with the work cards. It tells us that George again has to take care of Lennie, and that Lennie isn’t trusted by George. Again this idea is portrayed to the reader on page seventeen, we notice that George knows that he needs a plan b as Lennie cannot be trusted so his plan b is to tell Lennie to â€Å"hide in the brush until I come for you†. This helps us to understand the relationship even further. George also treats Lennie like a dog in one occasion in the chapter, â€Å"good boy†. This is something a master would say to a dog to encourage them, it also tells us the sort of role in the relationship George has again. In conclusion, we see that Steinbeck uses various techniques to portray the relationship between George and Lennie. But the main method is the idea of George being like a parent to Lennie.

Introduction Of Engine Block

Introduction Of Engine Block Until recently, cast iron and aluminum alloys have been successfully used to manufacture most diesel and conventional gasoline-powered engine blocks. However, with a greater emphasis on increasing the efficiency of the engine via weight reduction, there is a search for alternative alloys that are lighter than cast iron and aluminum alloys, while retaining the necessary strength to withstand the forces of an engine. In the late 1990s engine blocks made from plastic and other experimental materials were being used in prototype cars with the hope of developing more lightweight, efficient vehicles . Also lately new manufacturing processes have been developed that have brought to light two new alloys suitable for use in an engine block, magnesium alloy AMC-SC1 and compacted graphite cast iron (CGI). Thus this project will cover, the functional requirements of the engine block, the processes used to manufacture the part, and the mechanical properties of the alloys. INTRODUCTION: Todays engines are an integral component of an automobile that are built in a number of configurations and are considerably more complex than early automotive engines. The use of lighter and stronger engineering materials to manufacture various components of the engine has also had an impact allowing engineers to increase the power-to-weight of the engine, and thus the automobile. Since the engine block is also a relatively large component, it constitutes 20-25% of the total weight of an engine. Thus there is much interest in reducing the blocks weight.[Keay, Sue: Diet of Australian metal lightens cars and pollution, Media release, 14 October 2002.] Many early engine blocks were manufactured from cast iron alloys primarily due to its high strength and low cost. But, as engine designs became more complicated, the weight of the engine (and thus the vehicle) had increased. Thus the need to come up with lighter alloys that were as strong as cast irons arose. One such material that was being used as a substitute was aluminum alloys. Together, these two metals were used exclusively to fabricate engine blocks. Lately , however, a new material process has made a magnesium alloy suitable for use in engines. The alloy, called AMC-SC1, weighs less than both cast iron and aluminum alloys and represents new possibilities in engine manufacturing. A new manufacturing process have made compacted graphite cast iron (CGI) a viable alternative to gray cast iron for the manufacture of diesel engine blocks. Like magnesium alloys, this material offers a higher strength and lower weight than gray cast iron. Thus this section will cover materials used to manufacture engine blocks , component discussion, its functional requirements, and the materials used to manufacture the part. The mechanical properties of the individual alloys will be incorporated, along with the manufacturing processes used to fabricate the component. DESCRIPTION OF THE PRODUCT: WHAT IS AN ENGINE BLOCK? : The engine block is vital structure of vehicles which run on internal combustion, providing the powerhouse for the vehicle. The engine block is termed a block because it is usually a solid cast, housing the cylinders and their components inside a cooled and lubricated crankcase .Common components found in an engine include pistons, camshafts, timing chains,rocker arms, and other various parts. When fully stripped of all components, the core of the engine can be seen: the cylinder block. The cylinder block (popularly known as the engine block) is the strongest component of an engine that provides much of the housing for the hundreds of parts found in a modern engine. The block is typically arranged in a V, inline, or horizontally-opposed (also referred to as flat) configuration and the number of cylinders range from either 3 to as much as 16. Figure 1 shows engine blocks with V configuation. opposed configurations. Functional Requirements of a Cylinder Block: Because engine blocks are a critical component of an engine, it must satisfy a number of functional requirements. These requirements include withstanding high cycle fatigue stresses, thermal strains, and aggressive wear conditions over the full life of the engine, housing internal moving parts and fluids, ease of service and maintenance. REQUIRED MATERIAL PROPERTIES: The one-dimensional era of engine design is finished. The current approach considers the loads acting at each point of the engine block. (Vollrath, 2003) In order for an engine block to meet the above functional requirements, the engineering material(s) used to manufacture the the cylinder block material should have adequate strength and rigidity in compression, bending, and torsion. This is necessary to resist the gas pressure loads and also for the components, which convert the reciprocating motion of individual piston into a single rotary motion. The cylinder-block material should (a) be relatively cheap, (b) readily produce castings with good impressions, (c) be easily machined, (d) be rigid and strong enough in both bending and torsion, (e) have good abrasion resistance, (f) have good corrosion resistance, (h) have a high thermal conductivity,(to prevent failure under high temperatures). (i) retain its strength at high operating temperatures, and (J) have a relatively high thermal expansion, low density.(to resist expanding under high operating temperatures) High strength is a particular concern in diesel engines, since compression ratios are normally 17.0:1 or higher compared to about 10.0:1 for conventional engines. , and thermal conductivity . Good machinability and castability of the metal alloy are also important factors in selecting the proper material, as the harder it is to machine the product, the higher the costs of manufacturing. In addition to the previously mentioned properties, the alloys must possess good vibration damping to absorb the vibrations of the moving parts. METALS USED IN THE MANUFACTURE OF THE CYLINDER BLOCKS: Based on the functional requirements of the cylinder block and the material properties required to meet the functional requirements, industries have used cast iron and aluminum alloys to manufacture the blocks. EXISTING MATERIALS: 1)Cast iron alloys are used because of the combination of good mechanical properties, low cost, and availability. 2)Certain aluminum alloys combine the characteristics of iron alloys with low weight, thereby making the material more attractive to manufacturers who are seeking a competitive edge. NEW MATERIALS: 3)Compacted graphite cast iron is lighter and stronger than gray cast iron, making the alloy a more attractive alternative to the latter in the production of cylinder blocks, particularly in diesel engines. 4)Magnesium alloys, which were previously unsuited for use as an engine block material, have the advantage of being the lightest of all the mentioned metals, yet still retains the required strength demanded by a block. 1)GRAY CAST IRON ALLOYS: Gray cast iron alloy have been the dominant metal that was used to manufacture conventional gas-powered engine blocks. Though extensive use of aluminum alloys has minimized the popularity of this material, it still finds wide use in diesel-fueled blocks, where the internal stresses are much higher. The use of cast iron blocks has been wide spread due to its low cost and good formability. Generally types of gray cast iron of pearlite microstructure is used in the manufacturing of engine block. Gray cast iron alloys typically composition: A typical cast iron is a gray cast iron, which contains 2.5-4 wt.% carbon, 1-3 wt.% silicon, 0.2-1.0 wt.% manganese, 0.02-0.25 wt.% sulfur, and 0.02-1.0 wt.% phosphorus [Anyalebechi, P.N.: Essentials of Materials Science Engineering, January 2005, p. 94.]. and the balance (93.6%) iron. The carbon improves lubrication property of graphite, the silicon controls the formation of a laminated structure, called pearlite, which has good wear resistance, and the manganese strengthens and toughens the iron structure. A common aluminium alloy composition is 11.5% silicon, 0.5% manganese, and 0.4% magnesium, with the balance (87.6%) aluminium. The high silicon content in this alloy reduces expansion but improves cast-ability, strength, and abrasion resistance, while the other two elements strengthen the aluminium structure. While this alloy provides a good corrosion resistance, it can absorb only moderate shock loads. Types of cast iron used in engine block: SAE grade G2500- used for small engine blocks. SAE grade G3500-used for heavy and larger diesel engine blocks. Also some ductile iron are also used in manufacturing engine blocks. SAE AMS 5313C: mechanical properties: [alloying: understanding the basics , by joseph R devis.] Grade or class Hardness HB(a) Tensile strength min(b) MPa Yield strength min(b) MPa Elongtion in 50 mm(2in),%(b) Class A 190 max 414 310 15 Gray cast iron has excellent damping capacity, good wear and temperature resistance, is easily machinable, and is inexpensive to produce. However, gray cast irons are relatively weak and are prone to fracture and deformation. Although cast iron meets most of these requirements, it has a low thermal conductivity and is comparatively heavier. Due to these limitations, light aluminium alloys have been used as alternative cylinder-block materials for petrol engines. Cylinder liners are optional with cast-iron blocks; but are more essential with the relatively soft light aluminum alloy blocks, as they cannot directly withstand wear resistance. Because of the lower strength of the aluminum alloys, the blocks are cast with thicker sections and additional support ribs, so that their weight becomes about half of the equivalent cast-iron blocks. Due to these problems, compacted graphite iron has recently begun to compete with gray cast iron as the choice material to produce diesel engine blocks. COMPACTED GRAPHITE CAST IRON: Compacted graphite cast iron (CGI), which was accidentally discovered while trying to produce ductile cast iron, possesses higher tensile strength and elastic modulus than gray cast iron due to the compacted graphite found on the microstructure of CGI. Figure 8 CGI typical microstructure: 5% nodularity, 9% graphite, 265 particles/mm2. 3. CGI a new combination of properties: As shown in Fig. 8, the compacted graphite iron graphite particles appear as individual worm-shaped or vermicular particles. The particles are elongated and randomly oriented as in gray iron; however they are shorter and thicker, and have rounded edges. The compacted graphite morphology inhibits crack initiation and growth and is the source of the improved mechanical properties, as compared to gray iron. Compacted graphite iron invariably includes some nodular (spheroidal) graphite particles. As the nodularity increases, the strength and stiffness also increase, but only at the expense of castability and thermal conductivity (Guesser et all, 2001). It is usual to set a limit of 20% nodularity for CGI specifications. Table 1 shows mechanical properties of CGI, with grades from 300 to 500 MPa. In the case of cylinder blocks and heads, where castability, machinability and heat transfer are all of paramount importance, it is necessary to impose a more narrow specification. A typical specification for a CGI cylinder block or head can be summarised as follows: 1) 0-20% nodularity, for optimal castability, machinability and heat transfer 2) No free flake graphite, flake type graphite (as in grey iron) causes local weakness 3) >90% pearlite, to provide high strength and consistent properties 4) This general specification will result in a minimum-measured tensile strength of 450 MPa in a 25 mm diameter test bar, and will satisfy the ISO 16112 Compacted Graphite Iron standard for Grade GJV 450. The typical mechanical properties for this CGI Grade, in comparison to conventional grey cast iron and aluminium are summarised in Table 1: Mechanical and Physical Propertiesof CGI in comparison to conventional grey cast iron and aluminium at 20 °C Property Units GJV 450 GJL 250 GJL 300 A 390.0 Ultimate Tensile Strength MPa 450 250 300 275 Elastic Modulus GPa 145 105 115 80 Elongation % 1 to 2 0 0 1 Rotating-Bending Fatigue 20 °C) MPa 210 110 125 100 Rotating-Bending Fatigue (225 °C) MPa 205 100 120 35 Thermal Conductivity W/m-K 36 46 39 130 Thermal Expansion ÃŽÂ ¼m-m-K 12 12 12 18 Density g/cc 7.1 7.1 7.1 2.7 Brinnell Hardness BHN 10-3000 215-255 190-225 215-225 110-150 The results allow the comparison between CGI and gray iron. It can be seen the increase on tensile strength, moving from gray iron to CGI. CGI also shows a higher elastic modulus, when compared to gray iron. [- Mechanical properties of gray iron and CGI grades 400-450. 195-230 HB. Samples taken from the castings (Guesser, 2003)]. Figure 10 [Elastic modulus of gray iron and CGI grade 400. 12.0L I6 cylinder block (Guesser, 2003).] The results in Figure 10 were obtained from two sources: test bars and main bearings of a 12.0L cylinder block. The increase in elastic modulus, from 100 GPa for gray iron to 150 GPa for CGI, results in slighter cylinder bore distortion as reported by Tholl et all (1996), therefore reducing oil consumption and emissions. Results of fatigue strength tests can be seen on figure 11, comparing gray iron grade 250 and CGI grade 450, samples from an I6 5.9L diesel cylinder block. The fatigue limit for the gray iron is 62-79 MPa, depending on the carbon content, while for the CGI the fatigue limit is 175 MPa. The raise of fatigue strength allows the designer to reduce the cylinder block weight. As a result of mechanical properties improvements, a design study conducted by AVL Austria (Sorger Holland, 1999) has evaluated downsizing opportunities for a 1.8 L diesel engine cylinder block, converting from gray iron to CGI. The benefits of this conversion included: 1)9% reduction in overall weight of the finished engine 2) 22% reduction in weight of machined cylinder block 3) 15% reduction in overall length of the finished engine 4) 5% reduction in both; height and width of the finished engine Like gray cast iron, compacted graphite cast iron has good damping capacity and thermal conductivity, but its difficulty to machine has limited the wide-scale use of CGI. A new manufacturing process, however, has opened the way for larger applications of CGI. The development of rotary insert tools has increased the life of the tools used to machine the metal, thus allowing manufacturers to use CGI without worrying about purchasing new tools [Georgiou, George: Iron engines may be in your future, Tooling Production, September 2003, Vol. 69, issue 9, p. 26.]. MAGNESIUM ALLOYS: Magnesium alloys have been used in engines before, but not for cylinder blocks. Rather. The main advantage of this alloy is that the material is much lighter than cast iron and aluminum alloys and has the same strength as cast iron and aluminum alloys[Lampman, Steven: Tuning Up the Metals in Auto Engines, Advanced Materials Processes, May 1991, p. 17.][Anonymous, Magnesium alloy resists high temperature in engine blocks, Advanced Materials and Processes, August 2003, vol. 161, issue 8, p. 13.]. Material scientists and engineers were determined to exploit these characteristics of magnesium alloy and use it to fabricate engine blocks. There were a number of magnesium alloys available that met or exceeded the requirements demanded by manufacturers for an engine block, but insufficient material stability at high temperatures hindered their actual use. Following are the two alloys which have been found suitable for mass production of engine blocks. AMC-SC1: In 2003 material scientists and engineers from the Cooperative Research Center for Cast Metals Manufacturing and the Australian Magnesium Corporation presented their discovery of sand-cast AMC-SC1 magnesium alloy [Anonymous, Magnesium alloy resists high temperature in engine blocks, Advanced Materials and Processes, August 2003, vol. 161, issue 8, p. 13.]. This grade of magnesium alloy contains two rare earth elements, lanthanum and cerium, and was heat-treated with T6. This stabilizes the strength of the alloy at high engine operating temperatures, which is a necessary requirement for a cylinder block material [16]. Bettles et al. had performed experiments to determine the yield and creep strengths of AMC-SC1 and their results are shown in Table 3 [Bettles, C. et al., AMC-SC1: A New Magnesium Alloy Suitable for Powertrain Applications, Society of Automotive Engineers, 2003, p. 2.]. From Table 3, the most significant point is that the yield strength of AMC-SC1 essentially stays the same at 177 °C as it does at room temperature. Table 3: Yield and creep strengths of magnesium AMC-SC1 at room temperature, 150 °C, and 177 °C [17]. Room temperature 24 °C 150 °C 177 °C Yield strength, MPa 120 116 117 Creep strength, MPa 120 98 This means that the material is able to tolerate a wide range of operating temperatures without a loss in strength. Other properties of the magnesium alloy 10 include good thermal conductivity, excellent machining and casting qualities, and excellent damping characteristics. To demonstrate the significant weight savings of magnesium alloy over cast iron and aluminum alloy, consider BMWs inline-6 R6 (shown in Figure 4), which replaced the companys M54 aluminum engine. Its cylinder block is made of AMC-SC1 and is said to have decreased the weight of a comparably-built gray cast iron and aluminum alloy block by 57% and 24% [Jost, Kevin: BMW builds better inline six, Automotive Engineering International, January 2005, pp. 20-32.]. So far, BMW is the only company to have used magnesium alloy cylinder blocks in production vehicles. But, with a significant weight advantage over the current alloys used today and negligible increase in cost, other manufacturers will begin to consider the use of AMC-SC1 and possibly other grades of magnesium alloys for engine blocks. Figure 4: BMWs 6-cylinder R6 powerplant uses a magnesium alloy AMC-SC1-fabricated cylinder block [Jost, Kevin: BMW builds better inline six, Automotive Engineering International, January 2005, pp. 20-32.]. PRODUCTION PROCESS: STANDARD CASTING WITH SOME MODIFICATIONS: This alloy can be cast using a standard production process, with some modifications. For a magnesium alloy engine to be economically viable, it is not merely the cost of the alloy that is important. The casting process must also be commercially viable. There are several modifications required if an existing casting line of cast iron or aluminum is to be converted to one producing magnesium parts. These can be summarised as follows: à ¢Ã¢â€š ¬Ã‚ ¢ A new inhibitor in the sand cores to prevent reaction between the melt and the sand. à ¢Ã¢â€š ¬Ã‚ ¢ A redesign of the runner and gating system to ensure adequate filling (magnesium alloys have a low heat content). à ¢Ã¢â€š ¬Ã‚ ¢ Preheating of the core package to 150 °C. à ¢Ã¢â€š ¬Ã‚ ¢ Modifications to the core package design to allow low pressure rather than gravity filling and feeding. AM-HP2: AM-HP2 A High Pressure Diecasting Magnesium Alloy: The AM-HP2 magnesium alloy has similar high-temperature strength to AM-SC1 and has been specially tailored for use in the high pressure diecasting process. Like AM-SC1, the light-weight alloy significantly increases fuel-efficiency, environmental sustainability and vehicle agility and is suitable for the powertrain components of vehicles, such as engines blocks etc. Need for New alloy:AM-HP2 AM-HP2 has been specifically developed as a diecasting alloy for high temperature automotive powertrain applications, such as engine blocks, structural sumps and automatic transmission housings. The alloy is based upon the successful sand casting alloy, AM-SC1, with a modified composition to make it suitable for the high pressure die casting process. Commercial Opportunities AM-HP2 Magnesium Alloy in the Auto industry: High pressure diecasting is a highly productive process for mass production of light alloy components. While the casting integrity of sand casting and low pressure/gravity permanent mould castings is higher than high pressure diecasting, the latter technology is cheaper. Thus, this process is gaining popularity among auto manufacturers for casting of aluminium engine blocks. It is also the common process for powertrain components such as transmission housings. There is a strong demand in the automotive industry for a suitable high pressure diecasting magnesium alloy for high volume powertrain applications. AM-HP2 exhibits good diecastability and the required high temperature mechanical properties for engine components (including engine blocks) and automatic transmission housings. It has similar creep properties to alloy, AM-SC1. Advantages of AM-HP2 Magnesium over Other Alloys: A key advantage of AM-HP2 is that the alloy is more diecastable than competitor high temperature creep resistant magnesium alloys.Thus, the alloy can be more readily cast into complex shapes with fewer rejects and a wider operating window. The alloy also has better high temperature creep strength than its competitors and thus offers considerable advantage to engine designers seeking to obtain maximum performance for lowest weight and cost. current status of AM-HP2 magnesium development: Pilot scale diecasting trials and laboratory testing of mechanical properties have demonstrated the suitability of AM-HP2 for mass produced powertrain components. PRODUCTION PROCESSES: 3.2 Casting Processes There are two methods used to cast engine blocks for all materials: green sand molding or lost foam casting. The latter, pioneered by General Motors for their Saturn vehicles, have[11] become more popular due to its capability to produce near net shape components, provide tight tolerances for critical components, and reduce machine maintenance and cost [19]. Green sand molding, however, is still widely used in industry as material costs are low and most metals can be cast by this method [Luther, Norris: Metalcasting and Molding Processes, [Online], 22 March 2005-last visited, Available: http://www.castingsoruce.com/tech_art_metalcasting.asp.]. 3.2.1 Green Sand Molding: Green sand molding the common method to cast engine blocks. The term green denotes the presence of moisture in the molding sand . Figure demonstrates the pattern used in sand casting. The pattern mounted into the moulding box along with the runner and ingate system ready to produce a mould. [http://www.dmdaustralia.com.au/block1.html] From Figure 2, a combination of silica sand, clay, and water poured in one-half of the block pattern with a wood or metal frame. The mold is then compacted by squeezing or jolting, and the process is repeated for the other half of the mold. A core consisting of hardened sand is used for support. Then, molten cast iron, aluminum, or magnesium alloy is poured into the combined molds and solidifies. Once the latter part has been completed, the molds are removed, and the cylinder block is cleaned and inspected. Heat treatment of the block is then undertaken to improve the mechanical properties of the alloy for suitable use. [7]. 12 LOST FOAM CASTING: THE PROCESS: Figure 6: Graphical description of the last 6 of 7 methods of the lost foam casting method [Anonymous, Aluminum Cylinder Block for General Motors Truck/SUV engines, A Design Study in Aluminum Casings, pp. 1-31.] The lost foam casting process uses a expanded polystyrene replica of the part being cast. 1)The coated replica/pattern is placed in a flask and loose sand is placed around the pattern and shaken into its voids. 2)Molten metal is then poured through a foam sprue, or funnel, into the sand where the hot metal melts and displaces the foam of the pattern. 3)the metal cools in the shape of the part. The basic steps of the lost foam casting process are: 1) Pattern Molding Bead Pre expansion and Conditioning, Tool Preheat, Pattern Molding, Pattern Aging 2)Pattern/Cluster Assembly 3)Pattern Coating and Drying 4)Sand Fill and Compaction Metal Casting and Cooling 5)Shakeout, Clean-up, and Finishing Lost foam casting is a more reliable and efficient casting technique of the manufacture of engine blocks than green sand molding. The technique begins with the use of polystyrene beads placed in preexpanders for wet expansion to control bead size and density to produce four separate block moldings to be glued together to form the final mold [7, 19]. Next, the metal tool is preheated to remove any moisture and then filled with the beads. The tool is then heated via steam and placed in an autoclave, where it is subjected to high pressures in order to create the molds [7]. The tool is removed from the autoclave and immersed in water to finish the moldings. Precise control over the heating and cooling aspect ensures dimensionally accurate, smooth and strong molds [Anonymous, Aluminum Cylinder Block for General Motors Truck/SUV engines, A Design Study in Aluminum Casings, pp. 1-31.]. If the tool was not heated before the beads were injected, the results would be rough finishes in the molds with low-strength sections. If the tool and beads stay heated for an extended period of time, or is not cooled enough, the beads become overfused, which produces surface variations in the moldings. If the tool has been inadequately cooled, the molds will contain variations in dimensions [Anonymous, Aluminum Cylinder Block for General Motors Truck/SUV engines, A Design Study in Aluminum Casings, pp. 1-31.]. Figure 3 shows the final half stages of the lost foam casting method. . From Figure 3, once the individual molds are glued together, the assembly is placed in a vat with water-based ceramic liquid to prevent molten metal from destroying the mold, stiffen the assembly, and provide a smooth finish [Anonymous, Aluminum Cylinder Block for General Motors Truck/SUV engines, A Design Study in Aluminum Casings, pp. 1-31.]. The assembly can also be sprayed with the ceramic liquid, but is a time-consuming process. Next, the coated foam engine block is filled with sand,[13] compacted, and immersed in the molten metal alloy. Once cooled, sand is removed from the metal casting, cleaned, and undergoes heat treatment to increase the mechanical properties of the block. Finally, coolant and oil passages are machined into the block. Advantages over conventional sand casting: Unlike conventional sand casting, the lost foam process allows more complex and detailed passages and other features to be cast directly into the part. The lost foam process: 1) Forms complex internal passages and features without cores. 2) Reduces part mass with near net shape capability. 3) Eliminates parting lines. 4) Reduces machining operations and costs. 5)Provides for tight tolerances in critical areas and features. Lost Foam Casting for Fine Features: The lost foam casting process allows more complex and detailed passages and other features to be cast directly into the cylinder block. 1) In the cylinder block, oil galleries, crank case ventilation channels, oil drain back passages, and coolant passages are cast into the block. 2) These features would otherwise require drilling or external plumbing (with a potential for leaks). 3)Lost Foam castings have tighter dimensional tolerances compared to sand castings, because variations caused by core shift and core variability are eliminated and there is much less tool wear over the production life. The direct result is a significant reduction in machining costs and infrastructure investment and fewer opportunities for errors in machining and assembly. A comparison of green sand casting to lost foam casting shows a number of distinct advantages for lost foam: Property Green Sand Casting Lost Foam Casting Complex Internal Features and Part Consolidation Complexity determined by sand core limitations geometry, strength, and cost. Extensive and complex internal features (as small as 0.20) available in lost foam, based on detail duplication and pattern assembly in foam. Dimensional Tolerances +/- 0.030 is typical depending on part size, complexity, and geometry +/- 0.005-0.010 is typical depending on part size, complexity, and geometry. Surface Finish Capabilities 250-600 microinches typical. Depends on grain fineness of sand. 60-250 microinches typical. Depends on bead size and ceramic coating grain fineness. Feature Accuracy Core movement and shift between mold halves across the parting line limit feature accuracy. No cores or mold halves to shift and degrade feature accuracy Parting Line and Draft Angles Parting lines and draft angles are necessary for molding. No parting lines in the mold and minimal draft on tools. Environmental Costs Sand recovery requires binder removal and time consuming sand clean-up Sand is binder free, so it can be easily and rapidly recovered a

Ednas Escape The Awakening Essay -- essays papers

Edna's Escape The Awakening Edna’s Escape The ending of Kate Chopin’s The Awakening is both controversial and thought provoking. Many see Edna Pontellier’s suicide as the final stage of her â€Å"awakening†, and the only way that she will ever be able to truly be free. Edna’s suicide, however, is nothing more than her final attempt to escape from her life. Edna Pontellier’s life has become too much for her to handle, and by committing suicide she is simply escaping the oppression she feels from her marriage, the suppression she feels from her children, and the failure of her relationship with Robert. Edna Pontellier’s marriage is a failure in her own eyes. Although when thinking of other husbands she at one time admits that, â€Å"she knew of none better† than her own, she is in no way happy with her married life. When describing the feelings Edna had regarding her marriage Chopin describes the marriage as, â€Å"An indescribable oppression, which seemed to generate in some unfamiliar part of her consciousness, filled her whole being with a vague anguish. It was like a shadow, like a mist passing across her soul’s summer day†. Throughout the course of this novel Edna is coming to the realization that she is extremely unhappy with her married life, and she wishes to be free from the oppression that she feels with the relationship with her husband. Unfortunately for Edna divorce at this time is unheard of, and would be regarded as a disgrace to Edna as well as her family. Edna’s unhappiness with her marriage leaves her with few choices; she can remain in her marriage and be miserable, or she can leave her husband and face the consequences. Edna, however, does not have the heart for either of these choices, and escapes the pain of he... ...l not result from a new house, or her painting, or even her love for Robert, but instead will be much more difficult for her to obtain. It is this realization, as well as the oppression she feels from her marriage and the suppression she feels from her children that lead Edna to commit suicide, for she realizes that is the only way she will truly be able to escape her troublesome life. Edna Ponteillier’s suicide at the end of The Awakening is a result of her failed attempt at a new life. Edna’s suicide was her last resort, and was simply a way to escape from the troubles that resulted from the unhappiness she felt with her life. Edna’s suicide was not representative of the final stage of her â€Å"awakening†, but was merely an escape from the oppression she felt from her husband, the suppression she felt from her children, and from her failed relationship with Robert. Edna's Escape The Awakening Essay -- essays papers Edna's Escape The Awakening Edna’s Escape The ending of Kate Chopin’s The Awakening is both controversial and thought provoking. Many see Edna Pontellier’s suicide as the final stage of her â€Å"awakening†, and the only way that she will ever be able to truly be free. Edna’s suicide, however, is nothing more than her final attempt to escape from her life. Edna Pontellier’s life has become too much for her to handle, and by committing suicide she is simply escaping the oppression she feels from her marriage, the suppression she feels from her children, and the failure of her relationship with Robert. Edna Pontellier’s marriage is a failure in her own eyes. Although when thinking of other husbands she at one time admits that, â€Å"she knew of none better† than her own, she is in no way happy with her married life. When describing the feelings Edna had regarding her marriage Chopin describes the marriage as, â€Å"An indescribable oppression, which seemed to generate in some unfamiliar part of her consciousness, filled her whole being with a vague anguish. It was like a shadow, like a mist passing across her soul’s summer day†. Throughout the course of this novel Edna is coming to the realization that she is extremely unhappy with her married life, and she wishes to be free from the oppression that she feels with the relationship with her husband. Unfortunately for Edna divorce at this time is unheard of, and would be regarded as a disgrace to Edna as well as her family. Edna’s unhappiness with her marriage leaves her with few choices; she can remain in her marriage and be miserable, or she can leave her husband and face the consequences. Edna, however, does not have the heart for either of these choices, and escapes the pain of he... ...l not result from a new house, or her painting, or even her love for Robert, but instead will be much more difficult for her to obtain. It is this realization, as well as the oppression she feels from her marriage and the suppression she feels from her children that lead Edna to commit suicide, for she realizes that is the only way she will truly be able to escape her troublesome life. Edna Ponteillier’s suicide at the end of The Awakening is a result of her failed attempt at a new life. Edna’s suicide was her last resort, and was simply a way to escape from the troubles that resulted from the unhappiness she felt with her life. Edna’s suicide was not representative of the final stage of her â€Å"awakening†, but was merely an escape from the oppression she felt from her husband, the suppression she felt from her children, and from her failed relationship with Robert.

The Alamo Essay -- History Historical Mexican Essays

The Alamo The events that began on February 23, 1836 have roots that span as far back as 1808. This exploration into the events and carnage that took place before, during and after the Alamo will only go back to the events immediately leading up to the Alamo. Mainly the frame of mind the Mexican government had regarding the Texas settlers and the reasons leading to the confrontation at the Alamo.   Ã‚  Ã‚  Ã‚  Ã‚  In times before the confrontation at the Alamo, the Mexican government welcomed settlers into Texas. The motive behind Mexico’s act was to create a buffer zone between Mexican settlements and the Indians. Settlers were able to come to Texas as long as they promised to convert to Catholicism and become Mexican citizens among other stipulations. Moreover, Mexico had further problems, the most noticeable was Mexico’ s financial standing. The independence movement that freed Mexico from Spain also left Mexico â€Å"dead broke;† furthermore, they had no real way of watching or parenting the fledgling Texas. Hence, Texas became accustom to doing things without Mexico interfering. Soon after Mexico opened the door to Texas the population of settlers grew to make up 75 per cent of the whole population. This could be seen as a bad thing to the Mexican government because if Texas became entirely made up of settlers what was to stop Texas from breaking a way from Mexico for good. To add to the pressure pot the settlers were illegally trading, and engaging in illegal slavery, among other illegal acts. According to Walter Lord the American Settlers refused to pay any form of tax, in fact according to Lord’s figures only 1,665 pesos where collected from Texas in Two years.   Ã‚  Ã‚  Ã‚  Ã‚  These factors and many more including America herself showing interest in Texas, led Mexico to institute a restriction of the number of settlers allowed into Texas. In addition, â€Å"Mexico suspended all unfilled colonization contracts, and required passports issued by Mexican Consulate at their place of residence,† these policies alone angered the settlers who have been accustomed to a lazie fair approach. In addition troops were now being used to see that the laws were enforced and obeyed. As Myers points out: The North Americans had reason to protest. They had gone through the bad years when fields had to be chopped out of the woods and when an Indian raid was commoner that a square meal. An... ...nd bloody tiger to name a few. Many Americans had been opposed to the Texas cause, but no longer were they thinking about that, now they were thinking about revenge. Mexicans had slain American citizens and this had to be avenged in the mind of most Americans. The call to arms had now been rung, â€Å"Remember the Alamo.† The Alamo had been a total loss on the field of physical war fair, but on the playing ground of the mind the Alamo had seized the minds and hearts of every American and sympathizer alike, to rally to its call. So in the end I believe the Alamo was a total victory for the settlers cause. Works Cited General Antonio Lopez De Santa-Anna, D. Ramon Martinez Caro, General Vicente Filisola,   Ã‚  Ã‚  Ã‚  Ã‚  General Jose Urrea, and General Jose Maria Tornel; Translated by Carlos Castaneda.   Ã‚  Ã‚  Ã‚  Ã‚  The Mexican Side of the Texas Revolution. Dallas.: P.L. Turner Company,1956 General Miguel Sanchez Lamego; Translated by Consuelo Velasco. The Siege and Taking of The   Ã‚  Ã‚  Ã‚  Ã‚  Alamo. New Mexico.: Sunstone Press, 1968. Lord, Walter. A Time to Stand. Lincolon.: University of Nebraska Press.: 1978. Matovina, Timothy. The Alamo Remembered. Austin.: University of Texas Press.: 1995.

Live With Lightning Essay -- Essays Papers

Live With Lightning The main hero of the novel is looking for an answer to the question: â€Å"What is his place as a scientist in the world.† The book focuses on the historic period from the 30s till the end of the World War II. A common American post-student wants to become a scientist. He has nothing except his talent, courage, patience, persistence, and strong will to devote his life to physics. On obtaining his diploma and his appointment as an assistant and teacher in the University of Columbia, he spent his summer washing dishes, working at a gas station in a place with a significant name High Hope. He found by chance that he had taken the job from a man who had a family to support. Eric Gorin moved on. When asked whether he is especially interested in any particular field of physics, Eric frankly answered that he didn’t know enough about any of them yet. One of Eric’s professors Hollingworth is very kind to him, but physics is only a career, his way of making money. Eric was going to teach freshman physics lab and take his own courses towards his doctorate as well. â€Å"You’ll probably find the first year rather confusing and hard work to teach between the two schedules, but things will straighten out for you after a while. â€Å" – indifferently notices Earle Fox, department chairman. Eric is proud of talking to the Nobel Price winner, such a prominent figure in science But Earle Fox is a good artist. No one could guess how empty and unhappy his life is, the life of a skeptic and pessimist, the life of stereotype and standard. He never cared for the work, never put even a spark of passion into it. No soul there could be in the pure, abstract science. The men Fox saw had a fine and delicate intelligence, but the society which had reared them, had also told them that they were working in fields that were foreign to mainstreams of ordinary endeavor. The knew the verdict pronounced on them was the opposite of justice, they had made themselves willing to believe that science which they found most interesting in life had no connection with life. They found the peace, which made work possible. So that from disenchantment with the science, he had progressed to contempt for its practitioners and to a still profounder contempt to what he did. Earl Fox is the first symbolic impediment for Eric. He asked Gorin what made a young man choose of all... ...e going to make the grade as a civilization. The millennium was at hand. But the hopes were destroyed; atomic energy was used as a threat, open or implied to frighten other countries. He preferred painful, distressing truth to a peace-giving lie. He chose his way, and understood that every lab in the country was under pressure buy the military men and the people who had deliberately confused the bomb with atomic energy. He says: â€Å" I’m not going to be any Earl Fox. No student will hear me say, â€Å" What difference does it make?† Everything makes a difference now. Indifference is condemnation of the human race said Febermaher. Indifference is innocence sinister, which makes the minds and souls deliberately atrophied. When Americans asked, with horror, â€Å" How could the Germans be made to believe such things?† Febermaher was tempted to reply, â€Å" What makes Americans think that they would be any different†. Indifference is the bovine stupidity with which a herd of cows watch one of their own number being slaughter. And this sinister innocence is the ultimate cruelty of the universal kind. In America it is called cruelty, in Europe, the other side of the coin was called practicality.

Sample Final Project Chapter 1

CHAPTER I INTRODUCTION A. The Background of Selecting The Title In business world, to achieve a goal it is really need to have a good relationship between the superiors and the employees. It is because employees are one of the important elements in the company which can affect the company’s income and status. Facing directly the business condition now a day, the competitions are getting harder. Companies competed by rely on many sides which one of them is their employees. So, from here the company has to do a plan to defense the position in the market among the competitors to gain more profit. The profit comes from the consumer. Employees are the part in the company that understand and know what the consumer expected from the service or product. So, employee should can predict what product or service which can give the customers satisfaction. Conducting the training program is one of the opportunities that the company takes. Training program is one of the best choices to improve the employees’ job performance and increase incomes. Training process is not easy. There must be some steps to do for reaching the goal. Every forward looking company realized that introduced training program to old and new employee is needed. Giving the training to the employee is the company responsible. The superior in the company sure have to involve in the training process to lead the employees. It is why, the writer interest to make research what program that must and need to be conduct by the company to increase the employees’ job performance by choosing the title â€Å"THE EFFECTIVE TRAINING METHOD TO IMPROVE THE EMPLOYEES’ WORK PERFORMANCE AT PT. CALISPO MULTI UTAMA. B. Problem Identification Training process is no easy to be conduct. It needs a lot of preparation to determine which training programs have to be prepared and it is a problem that the company has to face. PT. CALISPO MULTI UTAMA face a problem which is they face obstacles in increasing the employees work performance. The poor of training program is very affecting the employees’ job performance. From the problem above, the writer would like to formulate her analysis of PT. CALISPO MULTI UTAMA throughout her studies with topic â€Å"the effective training method to improve the employees’ work performance â€Å". C. Hypothesis Hypothesis is the principle in the solving the problem based on the research which has not yet proved to be correct. Based on the research that I have done at PT. CALISPO MULTI UTAMA, which is â€Å"the more the company conducting the training, the more employees’ job performance will increase†. So, by conducting the training, it will show the changes in the result of employee job performance. D. The Method of Research Here I gather the information by using three method of research. First, the information from electronic media that is by internet research. Browsing the internet can give a lot of important information. From the internet, there are also a lot of sample of companies’ problems and the solutions. So from here, we can gain more information to completing this thesis. Second, the information from non-electronic media that is books from library and bookstores. There are a lot of book of management and other article or magazine which can tell more about the topic of this thesis. Third, is by field research. In this method, it is needed to do interview, giving questioners and gather primary data from the company. The objective of this research is to know haw far is the training program has been conducted in the company, how the employees’ performance been done. Field research is the most importance because we directly face the people and directly get the information. E. The Overview of Contents Chapter I:Introduction This chapter consists of the background of selecting the title, problem identification, hypothesis, the method of research, and the overview of contents. Chapter II:Theoretical Review This chapter consists of human resources management, motivation, job evaluation, transfer and training and development. Chapter III:The Company Profile This chapter consist a brief history of the company, the organization structure of the company, job description and implementing training system. Chapter IV:Analysis and Evaluation This chapter consists of the method of training in improving the employees’ job performance, the purpose of training, training design and measure of success by the writer about PT. CALISPO MULTI UTAMA. Chapter V:Conclusion and Suggestion This chapter consists of the conclusion and suggestion that make by the writer about PT. CALISPO MULTI UTAMA to help the company to solve the problem to reach the company goal.