Reinforced Concrete Frame Structure Advantages

Reinforced Concrete Frame Structure Advantages Reinforced concrete is one of the most widely used modern building materials. Concrete is artificial stone obtained by mixing cement, sand, and aggregates with water. Fresh concrete can be molded into almost any shape, which is an inherent advantage over other materials. Concrete become very popular after the invention of Portland cement in 19th century. However, its limited tension resistance prevented its wide use in building construction. To overcome this weakness, steel bard are embedded in concrete to form a composite material called reinforced concrete. Developments in the modern reinforced concrete design and construction practice were pioneered by European engineers in the late 19th century. At the present time, reinforced concrete is extensively used in a wide variety of engineering applications. The worldwide use of reinforced concrete construction stems from the wide availability of reinforcing steel as well as the concrete ingredients. Unlike steel, concrete production does not require expensive manufacturing mills. Concrete construction, does, however, require a certain level of technology, expertise, and workmanship, particularly in the field during construction. In some cases, single-family houses or simple low-rise residential buildings are constructed without any engineering assistance. The extensive use of reinforced concrete construction, especially in developing countries, is due to its relatively low cost compared to other materials such as steel. The cost of construction changes with the region and strongly depends on the local practice. As an example, a unit area of a typical residential building made with reinforced concrete costs approximately $100/m ² in India, $250/m ² in Turkey, and $500/m ² in Italy. With the rapid growth of urban population in both the developing and the industrialized countries, reinforced concrete has become a material of choice for residential construction. Unfortunately, in many cases there is not the necessary level of expertise in design and construction. Design applications ranges from single-family buildings in countries like Colombia to high rises in China. Frequently, reinforced concrete construction is used in regions of high seismic risk. Introduction Steel reinforced concrete is a specific type that has had strong steel rebar or fibers added to it while wet, creating a very strong type of concrete that is able to withstand almost anything when it has dried. Because the result of using steel reinforced are so good for the strength of the building, most modern building today use steel reinforced concrete in the construction process. By adding thin steel bars to concrete can increase the strength of the concrete, making it better to use in variety of application. Today, many of the buildings located nations use reinforced concrete to make the buildings stronger and better able to in industrialized withstand the ravages of time and the weather. Reinforcing the concrete that will be used on the buildings add tensile strength to the concrete, making it much stronger and more flexible that regular concrete, which helps prevent cracking and breakage. Steel reinforced concrete can be used in a number of building applications, including fl oors, beams, supports, walls, and frames. Steel reinforced concrete is a concrete in which steel reinforcement bars, plates or fibers have been incorporated to build up a material that would otherwise be fragile. If a material with high strength in tension, such as steel, is placed in concrete, then the composite material, reinforced concrete, resists compression but also bending, and other direct tensile action. A reinforced concrete section where the concrete resists the compression and steel resists the tension can be made into almost any shape and size for the construction industry. Reinforcing Steel Before placing reinforcing steel in forms, all form oiling should be completed. As mentioned earlier, oil or other coating should not contact the reinforcing steel in the formwork. Oil on reinforcing bars reduces the bond between the bars and the concrete. Use a piece of burlap to clean the bars of rust, scales, grease, mud or other foreign matter. A light film of rust or mild film is not objectionable. Rebars must be tied together for the bars tore main in a desired arrangement during pouring. Tying is also a means of keeping laps or splices in place. Laps allow bond stress to transfer the load from one bar, first into the concrete and then into the second bar. Advantages Behaviour Materials Concrete is a mixture of cement, stone aggregate, and small amount of water. Cement hydrates from microscopic opaque crystal lattices encapsulating and locking the aggregate into a rigid structure. Typical concrete mixes have low tensile strength. Steel, is placed in concrete, then it will not only resists compression but also bending, and other direct tensile actions. Steel also made the bonding of the aggregate in a concrete better. Physical characteristics of steel reinforced concrete: The coefficient of thermal expansion of concrete is similar to that of steel, eliminating internal stresses due to differences in thermal expansion or contraction. When the cement paste within the concrete hardens this conforms to the surface details of the steel, permitting any stress to be transmitted efficiently between the different materials. The alkaline chemical environment provided by calcium carbonate causes a passivating film to form on the surface of the steel, making it much more resistant to corrosion than it would be in neutral or acidic conditions. Common Failure Modes of Steel Reinforced Concrete Conventional steel reinforced concrete can failed due to inadequate strength, leading to mechanical failure, or due to a reduction in its durability. Corrosion and freeze may damage poorly designed or constructed reinforced concrete. When rebar corrodes, the oxidation products expand and tends to flake, cracking the concrete and unbonding the rebar from the concrete. Typical mechanisms leading to durability problems are as below: Mechanical failure Steel reinforced concrete may be considered to have failed when significant cracks occur. Cracking of the concrete section cannot be prevented. However, the size and location of the cracks can be limited and controlled by reinforcement, placement of control joints, the curing methodology and the mix design of the concrete. Cracking defects can allow moisture to penetrate and corrode the reinforcement. This is a serviceability failure in limit state design. Cracking is normally the result of an inadequate quantity of rebar, or rebar spaced at too great a distance. The concrete then cracks either under excess loadings, or due to internal effects such as early thermal shrinkage when it cures. Ultimate failure leading to collapse can be caused by crushing of the concrete matrix, when stresses exceed its strength by yielding of the rebar or by bond failure between the concrete and the rebar. Carbonation Carbonation or neutralisation, is a chemical reaction between carbon dioxide in the air and calcium hydroxide and hydrated calcium silicate in the concrete. The water in the pores of Portland Cement Concrete is normally alkaline with a pH in the range of 12.5 to 13.5. This highly alkaline environment is one in which the embedded steel is passivated and is protected from corrosion. The carbon dioxide in the air reacts with the alkaline in the cement and makes the pore water more acidic, thus lowering the pH. Carbon dioxide will start to carbonate the cement in the concrete from the moment the object is made. This carbonation process will start at surface, then slowly move deeper and deeper into the concrete. If the object is cracked, the carbon dioxide in the air will be better able to penetrate into the concrete. Carbonated concrete only becomes a durability problem when there is also sufficient moisture and oxygen to cause electro-potential corrosion of the reinforcing steel. Chlorides Chlorides, including sodium chloride, can promote the corrosion of embedded steel rebar if present in sufficient concentration. So, only use fresh raw water or portable water for mixing concrete. It was once common for calcium chloride to be use as an admixture to promote rapid set-up of the concrete. It was also mistakenly believed that it would prevent freezing. Alkali Silica Reaction This is a reaction of amorphous silica sometimes present in the aggregates with alkali, for example from the cement pore solution. The silica reacts with the alkali to form a silicate in the Alkali silica reaction, this causes localize swelling which causes cracking. The conditions are: aggregate containing an alkaline reactive constituent, sufficiently availability of alkali ions and sufficient moisture. This phenomenon referred as concrete cancer. This reaction occurs independently of the presence of rebar. Conversion of High Alumina cement Resistant to weak acids and especially sulfates, this cement cures quickly and reaches very high durability and strength. However, it can lose strength with heat or time, especially when not properly cured. Sulfates Sulfates in the soil or in groundwater, in sufficient concentration, can react with the Portland cement in concrete causing the formation of expansive products which can lead to early failure of the structure. Corrosion and Passivation of steel reinforcement Exposed steel will corrode in moist atmospheres due to differences in the electrical potential on the steel surface forming anodic and cathodic sites. Concrete as an environment The environment provided by good quality concrete to steel reinforcement is one of high alkalinity due to the presence of the hydroxides of sodium, potassium and calcium produced during the hydration reactions. The bulk of surrounding concrete acts as a physical barrier to many of the steels aggressors. In such an environment steel is passive and any small breaks in its protective oxide film are soon repaired. However, the alkalinity of its surroundings are reduced, such as by neutralization are able to reach the steel then severe corrosion of the reinforcement can occur. This in turn can result in to staining of the concrete by rust and spalling of the cover due to the increase in volume associated with the conversion of iron to iron oxide. Factors affecting corrosion rates of steel in concrete The permeability of the concrete is important in determining the extent to which aggressive external substances can attack the steel. A thick concrete cover of low permeability is more likely to prevent chloride ions from an external source from reaching the steel and causing depassivation. Alternatives for the reinforcing phase Where an adequate depth of cover is difficult to achieve due to design considerations or where aggressive environments are expected such as in marine structures or bridge decks, additional protection may be required for the embedded steel. This may take many and varied forms and commercial interest in this field is strong. The steel reinforcement itself may be made more able to maintain its passivity by providing it with a protective coating. In extreme circumstances, solid stainless steel may be used, although the perceived additional cost restricts its use in all but the most specialized applications. The ideal situation There can be little doubt that the most effective way of protecting steel which is embedded in concrete is to provide it with an adequate depth of cover by high strength, low permeability concrete free from depassivating ions such as chlorides. However, in the real world, concrete is laid by the tone in all weathers and environments, exposed to industrial atmospheres, de-icing salts and seawater. The real situation Contaminated materials and poor workmanship are hard to avoid completely but by understanding the often complex chemical and electrochemical conditions that can exists it should be possible to develop ways of producing structures which will last long into the next century. Deterioration mechanisms The majority of reinforced concrete around the world performs adequately and gives few problems. A minority of structures have deteriorated due to either the action of aggressive components from the external environment or incompatibility of the mix constituents. Problems can arise as a result of incomplete or inaccurate site investigation, poor design, badly specified concrete, poor workmanship and a range of other factors. Stages of deterioration The mechanisms of deterioration are primarily chemico-physical in nature and occur in three discrete stages which are initiation, propagation, and deterioration. Modes of deterioration Deterioration may occur due to a number of mechanisms on which a large body of literature already exists. These include: Corrosion of reinforcement due to chloride ions, carbonation and change in the rebar reinforcement. Sulphate attack of concrete Salt recrystallisation Soft water or acid attack of concrete Alkali aggregate reaction Thermal incompatibility of concrete components Shrinkage Frost damage Depth of cover Inadequate cover is invariably associated with areas of high corrosion risk due to both carbonation and chloride ingress. By surveying the surface of a structure with an electromagnetic covermeter and producing a cover contour plot, the high-risk areas can be easily identified. A cover survey of newly completed structures would rapidly identify likely problem areas and permit additional protective measures to be taken. Cracked cover It should be remembered that reinforced concrete is intrinsically a cracked material because the steel stops the structure failing in tension but the brittle concrete cracks to the depth of the reinforcement. Only those cracks above a critical width which intersect the steel are liable to assist the corrosion processes. Cost Incurred After a period of unprecedented growth in prices during 2004, early date for 2005 indicates that the constructional steel market faces greater stability in the year ahead. Despite the price increases, demand for steel in the UK market remained at a very high level in 2004. One of the principal concerns for steel users was the availability of material, but the year ended with more steel in the supply chain than there had been at the beginning. Structural steel frame costs The leading benchmark cost unit for structural steelwork is its unit cost per tonne which includes the steel and the following elements: Connection design, detail drawing, fabrication, testing, treatment and delivery, offloading, erection These are calculated against the overall estimated tonnage for the building to generate an overall frame cost. Unit costs per tonne can vary enormously as there are a combination of factors that influence the overall cost. Care should be taken in considering each projects characteristics in arriving at a tonnage rate. This can be calculated either on the number of beams and column in a building or a weight per m ². The relative costs of each element will vary depending on the nature of the project. The tonnage rate could be divided as follows: Materials 30% Engineering 5% Fabrication 35% Priming 8% Delivery 2% Erection 20% The costs assume that the structural steelwork contractor will provide their own crane for all the projects with the exception of office buildings, for which the main contractor provides a tower crane. The early involvement of structural steelwork fabricators is the most effective way to value engineer cost savings into steelwork frame. For example, using more substantial and therefore more expensive steel columns in a design could remove the need for stiffeners. The steel may cost more but it is cheaper overall than paying for labour to fabricate and weld stiffeners to the column. If this value is adopted early enough in the project across the whole frame design, significant cost savings can be achieved. The cost of a frame system alone should not dictate the choice of frame for a project. Rather it should be just one of a number of issues that should be considered when making the choice of frame material. The recent rises in reinforcement and steel prices have increased frame costs but the difference between steel and concrete frame costs remains insignificant. A 50% increase in European steel prices during 2004 has left many in the construction industry reviewing design solutions that have a heavy reliance on steel. The impact of the steel price rises and found that the whole project costs for concrete framed buildings are marginally less than for steel framed buildings. Foundation costs The foundations typically represent approximately 3% of whole project initial cost. For the heaviest reinforced concrete solutions, the foundations will be more expensive, but this represents only a small cost and can be offset by using post-tensioned slabs, which are typically 15% lighter. Cladding costs The thinner the overall structural and services zone, the less the cladding costs. Given that cladding can represent up to 25% of the construction cost it is worth minimizing the cladding area. The minimum floor-to-floor height is almost always achieved with a concrete flat slab and separate services zone. Partitions Sealing and fire stopping at partitions heads is simplest with flat soffits. Significant savings of up to 10% of the partitions package can be made compared to the equivalent dry lining package abutting a profiled soffit with downstands. This can represent up to 4% of the frame cost. Services co-ordination/ Installation/ Adoptability The soffit of a concrete flat slab provides a zone for services distribution free of any downstand beams. This reduces coordination effort for the design team and therefore the risk of errors. It permits flexibility in design and allows coordination effort to be focused elsewhere. Services installation is simplest below a flat soffit. This permits maximum off site fabrication of services, higher quality of work and quicker installation. These advantages should be reflected in cost and value calculations. Indeed, ME contractors quote an additional cost of horizontal services distribution below a profited slab of up to 15%. Flat soffits also allowed greater future adaptability. Fire protection For concrete structures fire protection is generally not needed as the material has inherent fire resistance of up to four hours. This remove the time, cost and separate trade required to attend the site for fire protection. Vibration The inherent mass of concrete means that concrete floors generally meet vibration criteria at no extra cost and without any extra stiffening. For more stringent criteria, the additional cost to meet vibration criteria is small compared to other structural material. Exposed soffit A concrete structure has a high thermal mass. By exposing the soffits this can be utilized through fabric energy storage to reduce initial plant costs and ongoing operational costs. Furthermore, the cost of suspended ceilings can be reduced or eliminated. Conclusion As a conclusion, the majority of reinforced concrete structures show excellent durability and perform well over their design life. Adverse environments or poor construction practice can lead to corrosion of the reinforcing steel in concrete. The major mechanisms for corrosion are atmospheric carbon dioxide ingress and chloride attack from cast-in or diffused chlorides. The corrosion and deterioration mechanisms are essentially the same for both carbonation and chloride attack. Proper choice of materials, adequate cover to reinforcement, good quality concrete and attention to the environment during construction will enhance the durability of reinforced concrete structures. For cost incurred, concretes range of inherent benefits including fabric energy storage, fire resistance and sound installation means that concrete buildings tend to have lower operating costs and lower maintenance requirements. For structure subjected to aggressive environments, combinations of moisture, temperature and chlorides may result in the corrosion of reinforcing and prestressing steel, leading to the deterioration of concrete and loss of serviceability. One preferred solution which has assumed the status of cutting-edge research in many industrialized countries, is the use of fiber reinforced polymer rebars in concrete. Fiber concrete is also becoming an increasingly popular construction material due to its improved mechanical properties over non-reinforced concrete and its ability to enhance the mechanical performance of conventionally reinforced concrete. DEFINITION OF FIBRE REINFORCED POLYMER Fibre-reinforced polymer (FRP), also known as fibre-reinforced plastic) are composite materials made of a polymer matrix reinforced with fibres. FRPs are commonly used in the aerospace, automotive, marine, and construction industries. FRPs are typically organized in a laminate structure, such that each lamina (or flat layer) contains an arrangement of unidirectional fibres or woven fibre fabrics embedded within a thin layer of light polymer matrix material. The fibres, typically composed of carbon or glass, provide the strength and stiffness. The matrix, commonly made of polyester, Epoxy or Nylon, binds and protects the fibers from damage, and transfers the stresses between fibers. TYPES OF MATERIAL USED Polymer There are two main types of polymer used for resins: thermosets and thermoplastics. The thermosetting polymers used in the construction industry are the polyesters and the epoxides. There are many thermoplastic resins used in composite manufacture: polyolefins, polyamides, vinylic polymers, polyacetals, polysulphones, polycarbonates, polyphenylenes and polyimides. Fibre A wide range of amorphous and crystalline materials can be used as the fibre. In the construction industry the most common fibre used is glass fibre (there are 4 types of glass fibre: E-glass, AR-glass, A-glass and high strength glass). Carbon fibre, of which there are 3 types (Type I, II, III) can be used separately or in conjunction with the glass fibre as a hybrid to increase the stiffness of a structural member or the area within a structure, so that the stiffness exceeds the value possible using only glass fibre. Aramid fibres can be used instead of glass fibres to give increased stiffness to the composite. Today each of these fibers is used widely in industry for any applications that require plastics with specific strength or elastic qualities. Glass fibers are the most common across all industries, although carbon fiber and carbon fiber aramid composites are widely found in aerospace, automotive and sporting good applications. Additives For structural applications it is mandatory to achieve some degree of flame retardant. Fire retardants are usually incorporated in the resin itself or as an applied gel-coat. Fillers and pigments are also used in resins for a variety of purposes, the former principally to improve mechanical properties and the latter for appearance and protective action. APPLICATIONS OF FRP IN CONSTRUCTION There are three broad divisions into which applications of FRP in civil engineering can be classified: applications for new construction, repair and rehabilitation applications, and architectural applications. NEW CONSTRUCTION FRPs have been used widely by civil engineers in the design of new construction. Structures such as bridges and columns built completely out of FRP composites have demonstrated exceptional durability, and effective resistance to effects of environmental exposure. Pre-stressing tendons, reinforcing bars, grid reinforcement, and dowels are all examples of the many diverse applications of FRP in new structures. REPAIR AND REHABILITATION One of the most common uses for FRP involves the repair and rehabilitation of damaged or deteriorating structures. Several companies across the world are beginning to wrap damaged bridge piers to prevent collapse and steel-reinforced columns to improve the structural integrity and to prevent buckling of the reinforcement. ARCHITECTURAL Architects have also discovered the many applications for which FRP can be used. These include structures such as siding/cladding, roofing, flooring and partitions. DESIGN CONSIDERATION The strength properties of FRPs collectively make up one of the primary reasons for which civil engineers select them in the design of structures. A materials strength is governed by its ability to sustain a load without excessive deformation or failure. When an FRP specimen is tested in axial tension, the applied force per unit cross-sectional area (stress) is proportional to the ratio of change in a specimens length to its original length (strain). When the applied load is removed, FRP returns to its original shape or length. In other words, FRP responds linear-elastically to axial stress.   FRP allows the alignment the glass fibers of thermoplastics to suite specific design programs. Specifying the orientation of reinforcing fibers can increase the strength and resistance to deformation of the polymer. Glass reinforced polymers are strongest and most resistive to deforming forces when the polymers fibers are parallel to the force being exerted, and are weakest when the fibers are perpendicular. Thus this ability is can be an advantage or a limitation depending on the context of use. Weak spots of perpendicular fibers can be used for natural hinges and connections, but can also lead to material failure when production processes fail to properly orient the fibers parallel to expected forces. When forces are exerted perpendicular to the orientation of fibers, the strength and elasticity of the polymer is less than the matrix alone. In cast resin components made of glass reinforced polymers such as UP and EP, the orientation of fibers can be oriented in two-dimensional and three-dimensional weaves. This means that when forces are possibly perpendicular to one orientation, they are parallel to another orientation; this eliminates the potential for weak spots in the polymer. COST With the rising cost of nickel, FRP has become a very competitive material of construction. It is very competitive with acid brick or rubber-lined carbon steel and much less expensive than alloy-clad carbon steel. It is generally more expensive than resin-coated carbon steel but has a longer service life in most applications. Because FRP does not require insulation, FRP ductwork is actually less expensive than resin-coated carbon steel. ADVANTAGES OF FRP Composites offer the designer a combination of properties not available in traditional materials. It is possible to introduce the fibres in the polymer matrix at highly stressed regions in a certain position, direction and volume in order to obtain the maximum efficiency from the reinforcement, and then, within the same member to reduce the reinforcement to a minimal amount at regions of low stress value. FRP products are a cost effective alternative to steel in many of the harshest industrial environments. The advantages of FRP products over other materials include: Corrosion Resistant Fibre Reinforced Polymer materials are designed to operate in aggressive environments. Little or no coating or treating required. Low maintenance requirements Designed and engineered to last, composite structural materials are virtually maintenance free. Impact resistant Inherent flexibility allows products to resist impact and failure. Non-conductive and Non metallic FRP constructions provide additional safety by stopping sparks and potential electrical hazards. Fire Retardant FRP has a low flame spread index when tested under ASTM E-84 and meets self extinguishing requirements of ASTM D-635. High strength-to-weight ratio The strong, but light weight alternative where heavy lifting or access is an issue. Reduced installation time and cost FRP products are easier and lighter to install. Normal hand tools are used to make adjustments. Therefore FRP offers greater efficiency in construction compared with the more conventional materials. DISADVANTAGES OF FRP Structural failure can occur in FRP materials when tensile forces stretch the matrix more than the fibers, causing the material to shear at the interface between matrix and fibers, tensile forces near the end of the fibers exceed the tolerances of the matrix, separating the fibers from the matrix and tensile forces can also exceed the tolerances of the fibers causing the fibers themselves to fracture leading to material failure. A serious matter relating to the use of FRPs in civil applications is the lack of design codes and specifications. For nearly a decade now, researchers from Canada, Europe, and Japan have been collaborating their efforts in hope of developing such documents to provide guidance for engineers designing FRP structures. FRP plastics are liable to a number of the issues and concerns surrounding plastic waste disposal and recycling. Plastics pose a particular challenge in recycling processes because they are derived from polymers and monomers that often cannot be separated and returned to their virgin states, for this reason not all plastics can be recycled for re-use, in fact some estimates claim only 20% to 30% of plastics can be material recycled at all. In addition, fibers themselves are difficult to remove from the matrix and preserve for re-use means FRP amplify these challenges. FRP are inherently difficult to separate into base a material that is into fiber and matrix, and the matrix into separate usable plastic, polymers, and monomers. These are all concerns for environmentally informed design today, but it must be noted that plastics often offer savings in energy and economic savings in comparison to other materials, also with the advent of new more environmentally friendly matrices such as bioplastics and UV-degradable plastics, FRP will similarly gain environmental sensitivity. DIFFERENCES BETWEEN CONVENTIONAL STEEL REINFORCED CONCRETE AND FIBRE-REINFORCED POLYMER (FRP) CONCRETE No. Conventional Steel Reinforced Concrete Fibre-Reinforced Polymer (FRP) Concrete 1 Definition: Steel reinforced concrete is a specific type that has had strong steel rebar added to it while wet, creating a very strong type of concrete that is able to withstand almost anything when it has dried. Definition: FRP concrete is composite materials made of a polymer matrix reinforced with fibres and typically organized in a laminate structure, such that each lamina (or flat layer) contains an arrangement of unidirectional fibres or woven fibre fabrics embedded within a thin layer of light polymer matrix material. 2 Corrosion of steel reinforcement: Exposed steel will corrode in moist atmospheres due to differences in the electrical potential on the steel surface forming anodic and cathodic sites. Corrosion Resistant: Fibre Reinforced Polymer materials are designed to operate in aggressive environments. Little or no coating or treating

The Role of Education in Plato’s Republic

The role and significance of education with regard to political and social institutions is a subject that has interested political philosophers for millennia. In particular, the views of the ancient Greek philosopher Plato, as evidenced in The Republic, and of the pre-Romantic philosopher Jean Jacques Rousseau in his Discourse on the Arts and Sciences, present a striking juxtaposition of the two extremes of the ongoing philosophical and political debate over the function and value of education. In this paper, I will argue that Rousseau's repudiation of education, while imperfect and offering no remedy to the ills it disparages, is superior inasmuch as it comes closer to the truth of things than does Plato's idealized conceptions. To do so, I will first examine Plato's interpretation of the role of education and its function in shaping the structure of society and government and in producing good citizens. I will then introduce Rousseau's view of education and the negative effects of the civilized culture which it produces, and using this view, will attempt to illustrate the naivete and over-idealization of Plato's notions. Finally, I will attempt to demonstrate that it is Rousseau's view, rather than Plato's, that is ultimately more significant in assessing the actual (vs. idealized) merits (or lack thereof, in Rousseau's case) by which education should be judged with regard to the nurturance of good citizens. For Plato, the question of the role of education arises near the end of Book II (377e), after a discussion of both the necessary and consequent attributes of Socrates' kallipolis or â€Å"Ideal City. Such a city, Socrates argues, will, before long, have need of both a specialization of labor (in order for the greatest level of diversity and luxury of goods to be achieved) and of the establishment of a class of â€Å"Guardians† to protect the city from its envious neighbors and maintain order within its walls (i. e. , to police and govern the city). This, in turn, leads inexorably to the question of what attributes the Ideal City will require of its Guardians, and how best to foster such attributes. The early, childhood education of the Guardians, Socrates argues, is the key. What, then, asks Socrates, should children be taught, and when? This quickly leads to a discussion of censorship. Socrates cites a number of questionable passages from Homer which cannot, he thinks, be allowed in education, since they represent dishonorable behavior and encourage the fear of death. The dramatic form of much of this poetry is also suspect: it puts unworthy words into the mouths of gods & heroes. Socrates suggests that what we would call â€Å"direct quotation† must be strictly limited to morally-elevating speech. Nothing can be permitted that compromises the education of the young Guardians, as it is they who will one day rule and protect the city, and whom the lesser-constituted citizens of the polis will attempt to emulate, assimilating, via the imitative process of mimesis, to the Myth (or â€Å"noble lie†) of the Ideal City in which justice is achieved when everyone assumes their proper role in society. The process of mimesis, is, of course, yet another form of education, in which those of Iron and Bronze natures are â€Å"instructed† and inspired by the superior intelligence and character of the Gold and Silver members of the Guardian class. It is therefore a form of education without which the polis cannot operate. Thus, for Guardian and ordinary citizen alike, the education of the young and the continuing â€Å"instruction† of the citizenry are crucial. In addition to these aspects, Plato also conceives of another function of education, and one which is quite significant in its relation to Rousseau's views. For Plato, education and ethics are interdependent. To be ethical, in turn, requires a twofold movement: movement away from immersion in concrete affairs to thinking and vision of unchanging order and structures (such as justice) and then movement back from dialectic to participation and re-attachment in worldly affairs. It is a temptation to become an abstract scholar. But the vision of the good is the vision of what is good for oneself and the city — of the common good. If one does not return to help his fellow human beings, he becomes selfish and in time will be less able to see what is good, what is best. An unselfish devotion to the good requires an unselfish devotion to the realization of this good in human affairs. Just as the purpose of understanding order and limits in one's own life is to bring about order and restraint in one's own character and desires, the understanding of justice requires application in the public sphere (through education). A man who forgets the polis is like a man who forgets he has a body. Plato thus advocates educating both the body and the city (for one needs both), not turning one's back on them. If education is, for Plato, the means by which man comes to fully realize (through society) his potential as a human being and by which society as a whole is in turn elevated, for Rousseau it is quite the opposite. Education, argues Rousseau, does not elevate the souls of men but rather corrodes them. The noble mimesis which lies at the heart of education in Plato's kallipolis is for Rousseau merely a slavish imitation of the tired ideas of antiquity. The ill effects of this imitation are manifold. Firstly, argues Rousseau, when we devote ourselves to the learning of old ideas, we stifle our own creativity and originality. Where is there room for original thought, when, in our incessant efforts to impress one another with our erudition, we are constantly spouting the ideas of others? In a world devoid of originality, the mark of greatness, intelligence, and virtue is reduced to nothing more than our ability to please others by reciting the wisdom of the past. This emphasis on originality is in marked contrast with Plato, who finds no value in originality, deeming it antithetical to a polis otherwise unified by shared Myths of the Ideal City and of Metals. Rousseau rejects this â€Å"unity†, rightly denouncing it as a form of slavery , in which humanity's inherent capacity for spontaneous, original self-expression is replaced with the yoking. of the mind and the will to the ideas of others, who are often long dead. In addition to suppressing the innate human need for originality, education (and the appetite for â€Å"culture† and â€Å"sophistication† that it engenders) causes us to conceal ourselves, to mask our true natures, desires, and emotions. We become artificial and shallow, using our social amenities and our knowledge of literature, etc. , to present a pleasing but deceptive face to the world, a notion quite at odds with the ideas of Plato. We assume, in Rousseau's words, â€Å"the appearance of all virtues, without being in possession of one of them. Finally, argues Rousseau, rather than strengthening our minds and bodies and (a critical point) moving us towards that which is ethical, as Plato contends, education and civilization effeminate and weaken us physically and (perhaps most significantly) mentally, and cause us, in this weakness, to stoop to every manner of depravity and injustice against one another. â€Å"External ornaments,† writes Rousseau, â€Å"are no less foreign to virtue, which is the strength and activity of the mind. The honest man is an athlete, who loves to wrestle stark naked; he scorns all those vile trappings, which prevent the exertion of his strength, and were, for the most part, invented only to conceal some deformity. † Virtue, as opposed to Plato's conception, is an action, and results not from the imitation inherent in mimesis, but rather in the activity — in the exercise — of the body, mind and soul. Education, however, demands imitation, demands a modeling upon what has been successful. How, then, do we rightly assess the merits of education with regard to its it molding of the public character — in its ability to produce â€Å"good† citizens. The answer to this hinges, I submit, on how we choose to define the â€Å"good† citizen. Clearly, if obedience (or â€Å"assimilation to a political ideology†, or perhaps â€Å"voluntary servitude†) is the hallmark of the good citizen, then we must regard Plato's disposition towards education as the proper one. However, obedience, despite its obvious centrality to the smooth operation of society (as we would have social chaos were it completely absent), has its useful limits. Over-assimilation to a political idea or â€Å"blueprint† is every bit as dangerous — indeed, far more so — as the utter under-assimilation of anarchy. For those inclined to dispute this, I would urge them to review the history of Nazi Germany as perhaps the definitive example of what sad, awful spectacles of injustice we humans are capable of when we trade in our mental and spiritual autonomy for the convenient apathy and faceless anonymity of the political ideal. Furthermore, if , as Rousseau contends, our civilization is such that, â€Å"Sincere friendship, real esteem, and perfect confidence [in each other] are banished from among men,† what is the quality of the society for which education — any modern education — purports to prepares us? When, â€Å"Jealousy, suspicion, fear coldness, reserve, hate, and fraud lie constantly concealed under †¦ [a] uniform and deceitful veil of politeness,† what is left to us to educate citizens for, other than the pleasure we seem to derive in pedantic displays of hoary knowledge? If we remove the civility from â€Å"civilization†, what remains to us that any education will remedy?

The Impact of Multiple Sclerosis on a Patients Life Essay

The impact of Multiple Sclerosis on a patient’s life Introduction Eight years ago my mother was diagnosed with Relapsing-Remitting Multiple Sclerosis, the most common form of Multiple Sclerosis (MS) affecting up to 85% of the MS patients, with twice as many women being affected as men1. It was a very difficult period for her as she had received very little support from her family and I find it fascinating how she managed to withstand the pressure and fight her condition despite all the odds being against her. For these reasons, I composed a poem from my mother’s point of view to try to empathize with her experience and understand the underlying issues of her condition. To have a sound foundation for this poem, I have carried out a†¦show more content†¦Ã¢â‚¬Å"Upon feeling that she was finally running out of fuel†, I was, at the age of 12, invited for an interview in a elite Czech boarding school which required me to undertake a number of examinations, interviews, travelling and extensive paper work. Despite her worsening condit ion, she was always there with me, doing all the paper work, practising with me various interview questions and really being the best mum. After I had been accepted to the boarding school, she started to gradually break down due to a number of reasons. While she saw my being accepted as an incredible success, especially for someone from a working class family, my entire family started hating her as they perceived this as her â€Å"getting rid of me and her not wanting to take care of me†. Shortly after, she started suffering from short-term memory loss, severe chest pain and loss of balance, leading to the diagnosis of Multiple Sclerosis. The diagnosis was by far one of the majorShow MoreRelatedMultiple Sclerosis (Ms) Is A Disease That Impacts The Brain,1040 Words   |  5 Pages Multiple Sclerosis (MS) is a disease that impacts the brain, spinal cord and optic nerves, which is together known as the Central Nervous System (CNS). It is perhaps one of the most common neurological disorders, affecting about 1 per 1,000 of the population (Beaumont, 2008). Multiple Sclerosis means â€Å"Multiple Scars† due to the many scars (lesions) that are located in the CNS. This disease involves two main systems in the body, the Central Nervous System and the Immune System. The Central NervousRead MoreA Critical Analysis Of Multiple Sclerosis Essay1495 Words   |  6 PagesA Critical Analysis of Multiple Sclerosis Janae Tanner Baltimore City Community College Dr. Emmanuel Okereke BIO 202-1758-ANATOMY AND PHYSIOLOGY I November 1, 2016 Abstract Multiple Sclerosis, commonly known as MS is an autoimmune disease of the central nervous system. Scientists have been studying MS since the 19th century. In MS, the body’s immune system produces cells and antibodies that attack myelin in your brain which is essential for the nerves in your brain and spinal cord to conductRead MoreMedical Ethics : Adult Stem Cell Research Essay1565 Words   |  7 Pagesessay I decided to write on Stem. Initially, I began by defining what stem cell is and the different types of stem cell scientist work with. I include the medical scenario of a woman from Huston by the name of Debbie Bertrand who suffered from Multiple Sclerosis. I also included Dr. Lall, discovery of stem cells in baby teeth, because I found the article to be very interesting. Philosophical question were asked and answered. The point of view of natural law was also mention to support my argument. TheRead MoreAn Autoimmune Disorder Of The Central Nervous System3281 Words   |  14 PagesMultiple Sclerosis Brandi McKinney PTH 246 Jean Hamrick June 25, 2015 â€Æ' Introduction Multiple Sclerosis, an autoimmune disorder of the central nervous system, was first discovered in 1868 by Jean-Martin Charcot.1,2 He defined it by its â€Å"clinical and pathological characteristics: paralysis and the cardinal symptoms of intention tremor, scanning speech, and nystagmus, later termed Charcot’s triad.†2 In Physical Rehabilitation, O’Sullivan, Schmitz, and Fulk defined multiple sclerosis as â€Å"a chronicRead MoreSpecial Needs : Multiple Sclerosis1971 Words   |  8 PagesSpecial Needs: Multiple Sclerosis Introduction Multiple Sclerosis is a lifelong, incurable disease, which affects people in many different ways. It is characterized as a chronic, progressive immune-mediated disease that varies in intensity from mild to severely disabling. Some present with a condition that involves only one or two periods of activity throughout their life. Others suffer major complications in a rapid progression of disease. The word â€Å"multiple† accurately describes this conditionRead MoreMultiple Sclerosis Essay examples1988 Words   |  8 Pagesillnesses are unexpected and can lead to life changes. A chronic illness can lead to a life altering illness. While some chronic illnesses can be cured in a few weeks or months many last a lifetime. Chronic illnesses typically have a significant impact on clients, like treatments, coping, and dealing with possible side effects. When the chronic illness progresses to death then the illness would be life altering. According to webmd.com Multiple Sclerosis or MS is a disease that affects the brainRead MoreEssay On Pluripotent Cells1143 Words   |  5 Pagesallow researchers to conduct drug testing in a wide range of cell types. Thus, improving outcomes for patients with many neurological diseases. The loss of neurons and glial cells cause neurological disorders, such as Parkinson’s disease and multiple sclerosis. Current major therapies focus on oral medications, in the case of Parkinson’s disease, L-dopa, and dopamine receptor agonists, in addition to deep-brain stimulation in the subthalamic nucleus. Furthermore, the use of a VNS device to preventRead MoreCase Study : Voyager Therapeutics, Inc.822 Words   |  4 PagesCompany. The main focus of this company is based on developing life changing treatments for patients suffering from various types of disease associated with central nervous system or CNS. The gene therapy is called AAV or adeno-associated virus, which is a therapeutic approach to alter the expression of a s pecific protein, thereby reducing the symptom experienced by patients, and that, will have a clinically meaningful impact on the patient’s life. The company has created a product engine to engineer, optimizeRead MoreStereotyping And The Health Care System1261 Words   |  6 Pagesreceive by the health care system. Whether people want to admit it everyone has stereotyped at one point in their life. I know I am guilty of it. This can happen without the person even knowing that they are doing it. How a person is raised and their families beliefs growing up can impact their beliefs. So one of the important questions to answer is does being stereotyped have a lasting impact beyond the moment when it happens? A study by science news in 2010 showed that stereotyping does have a lastingRead MoreWorking As A Clinical Social Worker1462 Words   |  6 Pagesclinical social worker in the Washington, DC area with patients with life-limiting illness such as Huntington’s disease, Parkinson’s, Multiple Sclerosis and Lou Gehrig ’s disease (ALS), has taught me to be eternally dedicated to a person-focused approaches to therapy supports with these patients and their family. I had considered this concept as broad theory in the past that held me to standard of consideration of the patientâ⠂¬â„¢s ideas. Now I am even more convinced than ever that the patient is my

Sleep Deprivation And Its Effects On Nurses Essay

Sleep Deprivation and Its Effects on Nurses The reason humans need sleep is not fully understood, but it is seen to have extremely important functions and can cause serious effects if individuals do not get enough sleep. Sleep disorders have been seen to cause serious side affects on individuals, especially those who work twelve-hour shifts or shiftwork. The purpose of the paper is to explore sleep disorders and possible treatments. Generally, individuals need seven to nine hours of sleep each night to function properly throughout the day; it is thought that over sixty-eight percent of people get less than eight hours of sleep (Hughes Rogers, 2004). The circadian rhythm is what facilitates our sleep cycles and determines when we go to sleep; there is two types of sleep REM and Non-REM sleep (Plotnik Kouyoumdjian, 2016). Non-REM sleep is typically the antecedent for REM sleep, here rapid eye movement occurs and this is where dreams occur (Plotnik Kouyoumdjian, 2016). There are five stages of sleep that each person goes through each time they sleep, in non-REM sleep, there are four stages and REM is the fifth stage (Plotnik Kouyoumdjian, 2016). Stage one consists of the transition from feeling wake to â€Å"falling asleep†, this typically lasts one to seven minutes (Plotnik Kouyoumdjian, 2016). Here the individual experiences loss of response to stimuli and experience waves of thoughts and images (Plot nik Kouyoumdjian, 2016). Stage two of non-REM sleep is theShow MoreRelatedSleep Deprivation On College Students1488 Words   |  6 Pages Sleep Deprivation in College Students Stress Management Betty Diaz August 14, 2017 Abstract A common problem in many young adults in college is sleep deprivation. College students are some of the most sleep deprived people. Their sleep hygiene behavior is worse than adults. An adequate amount of sleep time is 7 to 8 hours each night to complete a regular sleep cycle. When college students have less sleep time, they are disturbing their sleeping cycle and their bodies respond by decreasing theirRead MoreLegal Implications Of Medical Malpractice1494 Words   |  6 Pagesworkers working long shifts and being fatigued. Medical malpractice claims have been increasing and the reason cited in the claims were â€Å"medical errors that was precipitated by physician and nurse fatigue (MEDSURG Nursing, 2005). Additional studies suggest that a medical provider that averaged 5 hours or less of sleep are more likely to have a serious medical error that could result in he or she being named in a malpractice claim (Owens, 2007). Malpractice claims could potentially put a financial b urdenRead MoreEssay about Preventing and Assessing Intensive Care Unit Delirium955 Words   |  4 Pagesdifficult for the staff to correctly diagnosis and care for them. Sleep deprivation and environmental factors along with neurotransmitters are strongly related to the occurrence of ICU delirium. ICU staff needs to become more educated on prevention, detection, and proper treatment for the patient experiencing this condition. Assessing for and managing Intensive Care Unit (ICU) delirium has been difficult for bedside nurses ever since its recognition by the medical field (Lemiengre, etRead MorePersuasive Essay On Naps1598 Words   |  7 Pageswhen we didn’t get enough sleep the night before. We take naps all the time, but do we truly know how naps affect our body? Do we truly know how we benefit from naps?   Ã‚  Ã‚   Sleep is a complicated process that many of us take for granted. Without sleep, we would die. Sleep has many benefits, but unfortunately some people with sleep disorders or people with night shift jobs are unable to experience the benefits of sleep. The majority of people in the world face sleep deprivation because they do not getRead MoreProblems Associated With Medical Residence And Students1197 Words   |  5 PagesMedical residence and students are also familiar with shift work. These individuals may even exhibit more severe symptoms of fatigue than nurses and physicians. The average resident works roughly 90 hours a week. They also work shifts known as heavy call rotations. These heavy call rotations consist of residents being on call two to three days a week with, one 24 hours day off out of a 7-day period. Within this rotation they are required to experience both day and night shifts (Lockley, Barger 10-12)Read MoreSleep Deprivation And Its Effects On Society Ess ay1730 Words   |  7 Pageseffectiveness of those hours however, depend on effective rest. â€Å"Sleep is integral to the health and well-being of all people† (Wells 233). Sleep is simply defined as the body’s rest cycle – a time to recharge. The widely accepted metric for normal or sufficient sleep is about 8 hours of uninterrupted sleep. When this metric is not met, either through total sleep loss or accumulated sleep debt, the effect can be dire, â€Å"Sleep deprivation results in poor memorizing, schematic thinking, which yields wrongRead MoreSleep Deprivation And Postpartum Depression918 Words   |  4 PagesSleep deprivation and postpartum depression are different diagnoses, however, they have similar symptoms and one can often cause onset of the other. The most typical occurrence that we see happening is sleep deprivation due to postpartum depression. The following paper will discuss the diagnoses and symptoms of both sleep deprivation and postpartum depression, as well as explain how postpartum depression can cause the onset of sleep deprivation, and vise versa. Postpartum depression is the mostRead MoreThe Challenges Of Shift Work850 Words   |  4 Pagesshift work those include: nurses, policemen, and security guards a few of the occupations. What is shift work? Shift work is work performed outside the typical daytime hours of 7 a.m. to 6 a.m. (Blachowicz Letizia, 2006). The increase in pay is one of the numerous benefits for shift work employees. Nevertheless, there are many obstacles that come with working outside of normal work hours. The Significance of Sleep The biggest consequence of shift work is the lack of sleep. Often defined as fatigueRead MoreThe Effects Of Sleep Deprivation On Children s Routine Performance And Interaction Skills979 Words   |  4 PagesSleep deprivation has likely harmed most people’s routine performance and interaction skills at least enough to alarm them of its profound impairment to their mental and physical state. Everyone knows the feeling of being short-tempered and irritable because they didn’t get enough sleep the night before, but many also know the feeling of delirium and decreased cognitive abilities associated with many frightening consequences such as surmountable drops in their ability to communicate well with othersRead MoreLiterature Review On Nurse Staffing899 Words   |  4 PagesA Literature Review: Nurse to Patient Ratios and Staffing One of the greatest challenges in healthcare, as well as the biggest threat to patient safety, is staffing and the nurse to patient ratio on hospital floors. Studies have shown that low staffing levels lead to increased mortality rates in patients, as well as multiple other adverse effects including falls and pressure ulcers. These adverse effects are all preventable, but policies on staffing must be in place to ensure safety for staff and