Approaches to Flat Slab Design

Approaches to Flat Slab DesignAbstractThis dissertation aims at the sheepfold behaviour of reinforced concrete insipid slabs in the elastic range and at the ultimate dispatch. As such(prenominal), it endeavours to give readers a thorough knowledge of the fundamentals of slab behaves in crinkle. Such a orbit is essential for a complete and proper understanding of create commandment requirements and convention procedures for flexure behaviour of slabs.The dissertation commences with a general history stress and the advantages of victimisation monotonic slab as the causa of fib construction. After that, an introduction of various slabs psycho abstract method as substantially as the determination of the dispersion of moments using elastic theory lead be discussed.The building ordinance based methods like ACI direct foundation method, Simplified coefficient method for BS8110 and EC2 and Equivalent material body method will be explained in details. After that follows a detailed of take a hop procedures for the ultimate outline and concept of unconditional slab using general lower berth bound theory for peel method and upper bound theory for let up line analysis. excessively, the fundamental of the finite element method will be discussed as well.Then, analysis will be carried out on a typical planar slab panel base on each protrude shape up available such as have a bun in the oven line method, simplified coefficient method, direct throw method, finite element method as well as Hillerborg strip method. The flexure resistant holded from the analysis result will then be comp ard among each others and mellowedlighting the accomplishable pros and cons of the varied analysis. Eventually, the analysis results will then be discussed in exhibition to conclude a rational glide path to right away(p) slab purport and notwithstanding recommendation will be given to the future emolument of this research.1. Introduction cover is the most astray employ construction material in the world comp atomic number 18 to steel as concrete is well cognize as the most versatile and durable construction materials. In fact, concrete is also one of the most consumed substances on Earth after water 1. Concrete has played a major role in the shaping of our civilization since 7,000 BC, and it cornerstone be seen everywhere in our built environment, being employ in hospitals, residential buildings, schools, offices, industrial buildings and others 2.Nowadays, construction should not just be about achieving the cheapest building possible, but providing best value for the client. The best value may be about costs, but also includes speed of construction, robustness, durability, sustainability, spacious environment, etc. In fact, umteen reference of concrete appall construction dejection easily set up the above requirements.In the past, forming the concrete floor construction into shape was potentially the most costly and grasp intensive part of the process. Nowadays, with the help of modern high efficiency modular form snip has speed up the concrete floor construction process. Alternatively, floor slab elements may be factory precast, requiring only assembly, or stitching in concert with in-situ elements. The result is an economic and swift process, capable of excellent quality and finishes to suit the buildings needs.1.1 Types of concrete slab constructionConcrete slab floor is one of the key geomorphological elements of any building. Concrete floor choice and envision can have a surprisingly influential role in the performance of the final twist of the building, and importantly will also influence people using the building. In general, cost alone should not dictate slab floor choice in the construction.However, numerous issues should be considered when choosing the optimum structural solution and slab floor type that give best value for the construction and operational stages. The optimum slab floo r option should inherit benefits such as fabric energy storage, fire resistance and sound insulation between floors and others as achieving these requirements will eventually help the concrete building to lower the operation costs and maintenance requirement in long term. In general, reinforced concrete slab floors can be divided into three categories as detailed belowFlat slabFlat slab is also referred to as light beamless slab or tight plate. The slab schemes ar a subset of ii-way slab family, meaning that the system transfer the ladle path and deforms in two directions. It is an extremely fair structure in concept and construction, consisting of a slab of uniform ponderousness supported directly by the towboats with no liaise beams, as shown in common fig 1.1.The choice of now slab as building floor system is usually a matter of the magnitude of the design loading and of the spans. The capacity of the slab is usually restricted by the authority in punching shear at th e sections around the columns. Generally, column capitals and drop panels will be used within the flat slab system to avoid shear failure at the column section when larger loads and span atomic number 18 present, as shown in Figure 1.2.Figure 1.1 Solid flat slab Figure 1.2 Solid flat slab with drop panelFlat slab is a highly versatile element widely used in construction due to its capability of providing minimum depth, fast construction and allowing a flexible column grid system.Slabs supported on beams unidirectional spanning slabs ar mostly rectangular slabs supported by two beams at the opposite edges and the loads ar transferring in one direction only. Figure 1.3 shows the type of one-way slabs.Deep beam and slab Band beam and slabFigure 1.3 Type of one-way slabsHowever, slab supported on beams on all sides of each panel are generally termed two-way slabs, and a typical floor is shown in Figure 1.4.Figure 1.4 Two-way slabThe beams living the slabs can generally be wide and flat or narrow-minded and dusky beam, depending on the structures requirements. Beams supporting the slabs in one or two way spanning slabs die hard to span between columns or walls and can be simply supported or continuous. In this beam-slabs system, it is quite easy to visualize the path from the load point to column as being transferred from slab to beam to column, and from this visualization then to compute realistic moments and shears for design of all members.This form of construction is ordinarily used for irregular grids and long spans, where flat slabs are unsuitable. It is also good for transferring columns, walls or heavy point loads to columns or walls below. This method is time consuming during the construction stage as formwork tends to be labour intensive 3. rib and Coffered slabsRibbed slabs are made up of wide band or deep beams running between columns with equal depth narrow ribs spanning the orthogonal direction. Loads are transferring in one direction and a t hin topping slab completes the system, see Figure 1.5.Ribbed with deep beam Ribbed with wide beamFigure 1.5 Types of ribbed slabsCoffered slab may be visualized as a set of crossing joists, set at small spacing relative to the span, which support a thin slab on top. The recesses in the slab usually cast using either removable or expendable forms in order to reduce the weight of the slab and allow the use of a large effective depth without associated with slab self weight.The large depth also helps to stiffer the structure. Coffered slabs are generally used in situations demanding spans larger than perhaps about 10m. Coffered slabs may be designed as either flat slabs or two-way slabs, depending on just which recesses are omitted to give larger solid areas. Figure 1.6 shows the types of waffle slabs.Coffered slab with wide beam Coffered slab without beamFigure 1.6 Type of coffered slabsRibbed and coffered slabs construction method provides a twinkle and stiffer slab, reducing the e xtent of foundations. They provide a very good form where slab vibration is an issue, such as electronic laboratories and hospitals. On the other hand, ribbed and coffered slabs are very consuming during the construction stage as formwork tends to be labour intensive 3.1.2 Flat slab design as the choice of researchThe choice of type of slab for a particular floor depends on many factors. Cost of construction is one of the important considerations, but this is a qualitative argument until specific cases are discussed. The design loads, serviceability requirements, required spans, and strength requirement are all important. Recently, solid flat slab is puffting popular in the construction industry in Europe and UK due to the advantages as belowFaster constructionConstruction of flat slabs is one of the quickest methods among the other type of floors in construction. The advantages of using flat slab construction are becoming increasingly recognised. Flat slabs without drops (thickene d areas of slab around the columns to resist punching shear) can be built faster because formwork is simplified and minimised, and rapid turn-around can be achieved using a combination of early striking and flying systems. The overall speed of construction will then be limited by the gait at which vertical elements can be cast 4.Reduced services and cladding costsFlat slab construction places no restrictions on the positioning of crosswise services (eg. mechanical and electrical services which mostly running across the ceiling) and partitions and can minimise floor-to-floor heights when thither is no requirement for a deep false ceiling. In other words, this helps to lower building height as well as reduced cladding costs and prefabricated services 4.Flexibility for the residentFlat slab construction offers considerable flexibility to the occupier who can easily alter internal layouts to accommodate changes in the use of the structure. This flexibility results from the use of a s quare or near-square grid and the absence of beams, downstands or drops that complicate the routing of services and location of partitions 4.Undoubtedly, flat slab construction method is getting popular but there are still many incompatible views about what constitutes the best way of reinforcing concrete in order to get the most economic construction. In addition, a range of methods is available for designing the flat slab and analysing them in flexure at ultimate state. Different analysis and design methods can easily result in variety of polar reinforcement arrangements within a single slab, with consequent of making the dissimilar assumptions in each analysis and design method.Therefore, this research hurl will concentrate in examining the various analysis methods for the design of flexural reinforcement of reinforce flat slabs in terms of the code provisions, yield line analysis as well as finite element analysis method.1.3 Research objectivesReinforced concrete slabs are a mong the most common structural elements, but contempt the large number of slabs designed and built, the details of elastic and plastic behaviour of slabs are not always appreciated or properly taken into bankers bill oddly for flat slab system. This happens at least partially because of the complexities of mathematic when dealing with elastic plate equations, especially for support conditions which realistically approximate those in multi-panel building floor slabs.Because the theoretical analysis of slabs or plates is a great deal less widely known and managed than is the analysis of elements such as beams, the provisions in building codes generally provide both design criteria and methods of analysis for slabs, whereas only criteria are provided for most other elements.For example, Chapter 13 of the 1995 edition of the American Concrete Institute (ACI) Building calculate Requirements for Structural Concrete, one of the most widely used Codes for concrete design, is devoted largely to the determination of moments in slab structure. Once moments, shear, and torques are found, sections are proportioned to resist them using the criteria specified in other sections of the kindred code 5.The purpose of this research project is to examine the analysis methods such as Hillerborgs strip, yield line analysis, equal frame method, finite element method and etc. particularly for the design flexural reinforcement of reinforced flat slabs, and meanwhile to gain full understanding of the theories. The different analysis methods will then be analysed and compared with the flexural capacity method calculated using general codes of ACI 318 5, Eurocode 2 6 and BS8110 7. The outcomes of the comparison will lead to highlight the pros and cons of different approaches and codes paving the way to find out a rational approach for the flat slab design in flexure.The main objectives of the proposed research areTo examine the different methods and codes use to handle the flexur al capacity of the slab.To outlined the different positive and negative aspect in a specific code or method of designTo gain full understanding of the flexural design theories and code requirements.To highlight the most economical design solution to overcome the flexure in a flat slab while maintaining the safety as code requirements.1.4 Research dissertation methodologyThe following will be the proposed methodology of the research dissertationBackground of flat slab in construction industryResearch of the evolution of flat slabs in the past decades and the major contributions made for the construction industry. Difficulties faced during the flexure design of flat slabs in the past and the possible solution for the problems will be discussed. This part of research process result in closer to the background history and the revolution of flat slab in construction.Overview of flat slab design methodsExamine each design approaches used to design for flexure in flat slab such as yield l ine analysis, Hillerborgs strip method, the simplified coefficient method for BS8110 or Eurocode 2 and direct design method for ACI. An insight into different methods and codes will help to establish and revision the general code provisions and also gain the full understanding of theory and design of flat slab.Analysis of flat slab with different approachesDifferent analysis and design approaches for flexural reinforcement of RC flat slabs will be performed based on the same model slab. For instance, finite element computer software packages will be used to perform the finite element analysis. This part will eventually provide a deep understanding of various design methods as well as the ability to use finite element software in analysis and design. Research the flexural pros and cons in a flat slab among each design methods to get the rational design approach.DiscussionThe numerical analysis results obtain from different design methods and the codes will be discussed and compare a mong each others and also to the experimental results obtain in the previous research papers such as Engineering journals and other relevant engineering sources. This process will ultimately lead to a proper and systematic comparison of the codes and methods used, and highlighting their pros and cons.ConclusionThis part will conclude the discussion on advantages and disadvantages of all the examined design methods trying to establish which design method may result in a more economic and rational solution. Furthermore recommendations if required and the possible future areas of research will be brought up.1.5 Dissertation layoutChapter 2 Overview of DesignThis section will cover the brief of the evolution of flat slabs history.Brief introduction to the current codes for flat slab design such as American Concrete Institute ACI-318, British Standard BS8110 and Eurocode 2. In addition, the fundamental of analysis and flexure strength requirement of each code will be briefly described.Br ief introduction to design methods and history of yield line analysis, Hillerborgs strip method and finite element analysis in the slab flexure design.Chapter 3, AnalysisIntroduction of the analysis process and assumption made for each analysis methods.Focusing on different numerical aspects of the design under different codes and approaches. This section will provide deep understanding of various design methods and how the methods deal with the flat slab flexure problem.Chapter 4, DiscussionComparison between different code equations and theories.Various numerical result from different approaches will be compared and discussed based on the experimental results from past research papers.Pros and cons of different methods for design codes (eg. ACI, EC2 and BS8110), Hillerborg strip method, yield line analysisGraphs and tables will be available to show the summary of the results from different methods.Chapter 5, ConclusionSummarise the economic and rational flexural design approach fo r flat slabFurther recommendations2. Overview of Design MethodThe aim of chapter 2 is to provide an overview of the current practice of the design of reinforced concrete flat slab systems. General code of practice of ACI 318, EC2 and BS 8110 requirements are presented, along with the brief of the ACI direct design method, EC2/BS8110 simplified coefficient method, equivalent frame method, yield line, Hillerborgs strip method as well as finite element method. Each procedure and the limitations are discussed within.The following discussion is limited to flat slab systems. That is, the design methodologies presented below relate only to slabs of constant thickness without drop panels, column capitals, or edge beams. In addition, prestressed concrete is not considered.2.1 Approaches to the analysis and design of flat slabThere are a number of possible approaches to the analysis and design of reinforced concrete flat slab systems. The various approaches available are elastic theory, plast ic analysis theory, and modifications to elastic theory and plastic analysis theory as in the codes (eg. ACI Code 5).All these methods can be used to analyse the flat slab system to determine either the stresses in the slabs and the supporting system or load-carrying capacity. Alternatively, these methods can be used to determine the distribution of moments to allow the reinforcing steel and concrete sections to be designed.2.1.1 Elastic theory analysis courtly elastic theory analysis applies to isotropic slabs that are sufficiently thin for shear deformations to be insignificant and sufficiently thick for in-plane forces to be unimportant. The majority floor slabs fall into the range in which conventional elastic theory is applicable. The distribution moments forces found by elastic theory is such thatSatisfied the equilibrium conditions at every point in the slabCompliance with the boundary conditionsStress is proportional to strain also, bending moments are proportional to curvat ureThe governing equation is a quaternaryth-order partial differential equation in terms of the slab parenthesis of the slab at general point on the slab, the loading on the slab, and the flexural rigidity of the slab section. This equation is modify to solve in many realistic cases, when considering the effects of deformations of the supporting system.However, numerous analytical techniques have been developed to obtain the solution. In particular, the use of finite dispute or finite element (FE) methods enables elastic theory solutions to be obtained for slab systems with any loading or boundary conditions 8. Nowadays, with the advancement of computer technology software, designer can easily obtained the bending and torsional moments and shear forces throughout the slab easily with any finite element software packages such as ANSYS, LUSAS, STAAD PRO, SAP2000 and others.2.1.2 Plastic analysisThe plasticity, redistribution of moments and shears away from elastic theory distribut ion can occur before the ultimate load is reached. This redistribution occur because for typical reinforced concrete section there is pocket- sized change in moment with curvature once tension steel has reached the yield strength.Therefore, when the most highly stressed sections of slab reach the yield moment they tend to maintain a moment capacity that is close to the flexural strength with further increase in curvature, while yielding of the slab reinforcement spreads to other section of the slab with further increase in load.To determine the load carrying capacity of rigid-plastic members, two principles are used as belowLower Bound Theorem states that if for any load a stress distribution can be found which both satisfies all equilibrium conditions and nowhere violates yield conditions, then the load cannot cause collapse. The most commonly used approach is Hillerborgs Strip method 9.Upper Bound Theorem states that if a load is found which corresponds to any assumed collapse me chanism, then the load essential be equal to or greater than the true collapse. Finding a load which may be greater than the collapse load may be considered to be an unsafe method however, because of membrane action in the slab and the strain hardening of the reinforcement after yielding, the actual collapse load tends to be much higher. The commonly used approach of this method is yield line theory 9.2.2 Early History and Design PhilosophiesCredit for inventing the flat slab system is given to C.A.P. food turner for a system describe in the Engineering News in October 1905. However, the first practical flat slabs structure, Johnson-Bovey Building was built in 1906 in Minneapolis, Minnesota, by C.A.P. Turner. It was a completely new form of construction, and in addition there was no acceptable method of analysis available at that time.The structure was built at Turners risk and load- rilled before hand in to the owner. The structure met its load test requirements hence the flat sla b system was an instant commercial success and many were built in the United States subsequently on 10.Robert Maillart was also one of the founding fathers of flat slab from Europe, a design-and-built contractor who was perhaps better known for his work on the design of Reinforced Concrete Bridge. In 1908 Malliart carried out a series of full-scale tests on his flat slab system, see Figure 2.1.About the same time, Arthur Lord, a research fellow at the University of Illinois, also became interested in understanding how flat slabs behaved. In 1911, Lord obtained approval to instrument and test load a seven-storey flat slab building in Chicago. The view and work by them paves the way for the development of flat slabs. Their work evolved into a codified method of design and in 1930 became the London Building Act 11.Then, Robert Malliarts mark method is reviewed and compared with methods of elastic plate theory and plastic analysis. When compared the results with as elastic analysis, M alliart method considerably depreciate the bending moments acting for the flat slabs. However, the comparison made on limit analysis procedures, Malliarts design is still within the reasonable safety margins 12.Figure 2.1 prime(prenominal) test on flat slabs carried out in 1908 at Maillart Co. works in Zurich 11In 1878, Grashoff have tried to use polynomial approximation deflection function to work out the flat slab design but was unsuccessful to satisfy certain boundary conditions. At that time, concrete flat slab was emerged in the use as boiler cover plates for steam engines. Due to this problem, in 1872, Lavoinne was forced to work out the flat slab using the Fourier series. Lavoinne assumed a uniformely load is crocked on an infinite large plate and the plate is under simply supported conditions. In this assumption, Lavoinne neglected the poissons effect but Grashoff did consider 12.Maillart was aware of Grashoffs approach but he thought that it was useless for his purpose because it was restricted to uniformly distributed loads and did not account for the stiffening effect of columns. Based on simple equilibrium considerations, Nicholas managed to prove that all these systems resulted insufficient reinforcement 12.In the year of 1921, Westergaard and Slater managed to develop a new flat slab theory by comparison the theory results to the available experimental results at that time. In the theory, the stiffening effects due to the presence of columns under different load condition were discussed. Marcus had considered this theory later on by applying finite differences approach Marcus assumed few different boundary conditions and loads.During the past, due to the absence of a proper theory for flat slab design in Germany hence flat slab construction was almost impossible to be carried out. After sometime later, requirements for the flat slab design theory were established. This theory again mentioned that the design moment must follow Lewes theory (1 920, 1922) or theory developed by Marcus (1924). 12.2.2.1 Robert Maillarts ContributionIn 1902, Maillart has successfully developed dimensioning procedure to design a flat slab. This method was used and succeeds in building few numbers of large flat slabs structure. Due to the absence of strict construction rules in Switzerland, Maillart managed to design flat slab by considering the principle of superposition and successfully performed several arbitrary loads testing on flat slabs.Maillart derived the flexure moments at intermediate points by multiplying the flexural stiffness of the slab with the respective curvatures. The curvatures were derived using the double differentiation of the eight-order polynomial functions meanwhile the flexural stiffness of the slab was analysed using simple one way flexure test on respective slab strips 12.Maillarts reinforcement pattern for flat slab was very close to the current design approaches. Maillarts method required to reinforce the slab in only two directions. However, C.A.P. Turner insisted to reinforce the slab in four directions (see section 2.2.2 for details). Maillart dimensioning procedure emphasised in designing for positive moments at three different locations label as O, Q, and C in Figure 2.2 (where O at the midspan, Q at the quarter point of transverse span l2, and C in the column axis). nix moments were not checked in Maillart dimensioning procedure and all the bottom bars were simply bent up in the columns strips. In this method, the span ratios, size of column capital and the minimum height of the column capital were restricted to certain values, limiting the nominal shear stress at the circumference of the column to a permissible value 12.Figure 2.2 Robert Maillarts system and notation for plan view 12Later, Maillarts results were found underestimated with elastic analysis method. In addition, Maillarts method predicts a simplification in average moment value corresponding to span ratio while elastic plate theory remaining constant. Maillarts method underestimated elastic moments especially for a very large slab structure. In other words, Maillarts dimensioning method has significant differences with elastic analysis procedure in the flexure result of slab 12.Since Maillarts dimensioning method ignored the negative moments hence this worries the designer when came to the safety of the slab design. In conclusion, Maillart underestimated the moments compared to the elastic analysis on the other hand similar approach to the limit analysis 12.2.2.2 C.A.P. Turners ConceptTurner never published complete details of his design methods in order to maintain a competitive advantage in the design industry. However, some insights of Turners conceptual design of his flat slabs are available in his patent applications (C.A.P. Turner, Steel Skeleton and Concrete Construction and Elasticity, structure and strength of materials used in engineering.) 10.In fact, Turners principle design was more c oncerned about shear in flat slabs as stated by him, Beside the unreliableness of concrete in tension, it is unreliable in shear in its partially cured condition. This renders desirable use of reinforcement near the columns or supports to take boot of shear 10.In Turners principle, a so called Mushroom heads or cantilever caps were designed to provide shear resistance in flat slabs. As quoted by Turner, heads may be constructed in accordance with the shearing strain. The diameter of cantilever head was about one-half of the span length. Turner presumed the reinforcement cage acted as part of cantilever support to the slab 10. Figure 2.3 is an example of the cantilever support mentioned by Turner.Figure 2.3 C.A.P. Turner, mushroom or cantilever shear head 10Besides shear, Turner also focused on moments and used a four way reinforcement which also known as reinforcement belts, see Figure 2.4. These belts have the same width as that of the cantilever shear head. Turner believed that t he positive moments were small due to the cantilever support which is stated as, Referring to flat primordial plate, or the suspended slab portion, there is practically no bending moment at the center 10.Figure 2.4 C.A.P. Turners four belt floor reinforcement system 10Also, Turner believed reinforced the slab in four directions (four belt floor reinforcement system) would provide the moment resistance to counter the negative moments at supports. With these conceptions, Turner considered a very small total design moment to proportion the flexural steel in the four belts. Turner simplified the equation as following (1)where, W = total dead and live load in one bayL = nominal dimensions in one bayAs = total flexural steel, distributed among the four beltsfs = allowable steel stressd = distance to tension reinforcementTurner used the co-efficient of 1/50 for equation (1) above reference to Grashoff (1878) and to Prof. henry T. Eddy (1899) from University of Minnesota. In fact, Turner decided to use such a small coefficient due to the consideration of shorter effective span between cantilever heads. barely Turner also considered the slab spanning continuously instead of simply supported design. Numerous experiments data performed by Turner proved that such a coefficient was sufficient for flexure resistant. Besides, the use of cantilever head lead to the unnecessary of drop panels in Turners concept. Turners design concept has successfully built many buildings and bridges from year 1905 to 1909 10.2.3 contemporary Methods of Flat Slab Design2.3.1 American Concrete Institute (ACI)American Concrete Institute (ACI) is one of the oldest codes and widely been used to design for reinforced concrete structures. The code covers a number of methods to design a flat slab system. The design of structural concrete is dictated by Building Code Requirements for Structural Concrete (ACI 318-05) and translation (ACI 318R-05).The ACI code contains procedure for the design of u niformly loaded reinforced concrete flat slab floors. These methods are direct design techniques and equivalent frame method. All these methods are based on analytical studies of the distribution of moments using elastic theory and strength using yield line theory, the results of tests on

‘Big’ Data Science and Scientists

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R is a part of the GNU Project which is a collaboration that supports open source projects.A few online courses would help you learn some of the main steganography languages. One such course that is available currently is through the popular MOOCs website coursera.org. A specialization course offered by Johns Hopkins University through coursera helps you learn R programming, contrive data, machine learning and to develop data products. There are few more courses available through coursera that helps you to learn data science. Udacity is another popular MOOCs website that offers courses on Data Science, Machine Learning Statistics. CodeAcademy also offers similar courses to learn data science and coding in Python.When you start operating with data at the scale of the web, the fundamental approach and process of analysis must and will change. Most data scientists are working on problems that cant be run on a single machine. They have large data sets that require distributed processing. Hadoop is an open-source software framework for storing and large-scale processing of data-sets on clusters of commodity hardware. MapReduce is this programming paradigm that allows for massive scalability across the servers in a Hadoop cluster. Apache Spark is Hadoops speedy Swiss Army knife. It is a fast -running data analysis system that provides real-time data processing functions to Hadoop. It is important that a data scientist must be a ble to work with unstructured data, whether it is from social media, videos or even audio.KDnuggets is a popular website among data scientist that mainly focuses on latest updates and news in the field of Business Analytics, Data Mining, and Data Science. KDnuggets also offers a free Data Mining cast the teaching modules for a one-semester introductory course on Data Mining, suitable for advanced undergraduates or first-year graduate students.Kaggle is a platform for data vaticination competitions. It is a platform for predictive modeling and analytics competitions on which companies and researchers post their data and statisticians and data miners from all over the world compete to produce the best models. Kaggle hosts more data science competitions where you can practice, test your skills with complex, real world data and tackle actual business problems. Many employers do take Kaggle rankings seriously, as they can be seen as pertinent, hands-on project work. Kaggle aims at ma king data science a sport.Finally to be a data scientist youll need a good understanding of the industry youre working in and know what business problems your company is trying to solve. In terms of data science, being able to find out which problems are crucial to solve for the business is critical, in addition to identifying new ways should the business should be leveraging its data.A study by Burtch whole kit and boodle3 in April 2014, finds that data scientists earn a medial salary that can be up to 40% higher than other Big Data professionals at the same job level. Data scientists have a median of nine years of experience, compared to other Big Data professionals who have a median of 11 years. More than one-third of data scientists are currently in the first five years of their careers. The gaming and technology industries pay higher salaries to data scientists than all other industries.LinkedIn, a popular business oriented social networking website voted statistical analysis and data mining the top skill that got people chartered in the year 2014. Data science has a bright future ahead there will only be more data and more of a need for people who can find meaning and value in that data. Despite the growing opportunity, demand for data scientist has outpaced supply of talent and will for the next five years.1 McKinsey Global Institute, Big data The next frontier for innovation, competition, and productivity, June 20112 Thomas H. Davenport, D.J. Patil, Data Scientist The Sexiest Job of the 21st Century, Harvard Business Review, October 20123 Burtch Works Big Data Career Tips http//www.burtchworks.com/big-data-analyst-salary/big-data-career-tips/, accessed December 2014

Does Rape Justify Abortion? Essays -- Argumentative Persuasive Topics

Does Rape Justify Abortion? Rape is a horrendous crime, release a woman in a state of mental, physical, and emotional turmoil. When a woman becomes pregnant as the result of rape (which happens less than 1 per centum of the time), stillbirth will not take away the trauma, the nightm bes, the pain -- but it may add to them. According to a survey conducted by Dr. David Reardon of the Elliot Institute in 1990, the psychological complications of abortion include guilt, nervous disorders, nightmares, and memory loss (over 100 psychiatric reactions in all). Additionally, if there was a pre-existing disordered state (like rape), abortion may cause a worsening of psychological functioning. Because of problems with our justice system, rapists often walk free without punishment, while the child conceived in rape may flummox the ultimate injustice - death. Abortion supporters have argued for abortion in cases of rape at the expense of the emotional, physical and mental stability of t housands of women, as well as the lives of children. By the way, in every one of the 56 countries that now have abortion on demand, the initial step taken by abortion-rights activists was the intense lobbying for abortion in the so-called hard cases -- fetal deformity, rape and incest. The basic question to ask yourself is Is there a victim involved in abortion? There are many who say that there is not, that the preborn child is just a mass of tissue, a part of the womans body. If this were the case, then no one would have any agent to oppose abortion any more than they would oppose tonsillectomies or appendectomies. But is that the case? phylogenys in the science of fetology have given us greater... ... Collins, V. J. Principles of Anesthesiology. Philadelphia, PA Lea & Fabiger, 1976. Hamlin, H. Life or Death by EEG. Journal of the Amedos. Medical As,, 1W12/84, p. 20. Hooker and Davenport. The Prenatal Origin of Behavior. Kansas University of Kansas Press, 1952. Noonan , The Experience of Pain, New Perspectives on Human Abortion. N.p. A1etheia Books, 1981. p.213. Reinis, Stanislaw and Jerome M. Goldman. The Development of the Brain. Springfield, IL Charles C Thomas Publishers, 1980. Rockwell, P.E.,M.D. Director of Anesthesiology, Leonard Hospital, Troy, NY, U.S. Supreme Court, Markle vs. Abele, 72-56, 72-730, 1972. P.11 The Silent Scream. Cleveland, OH American Portrait Films, 1984. Tanner, J.M. and G.R. Taylor, Time-Life Books. Growth, New York Life Science Life, 1965. p.64.

Rainforest Proposal :: essays research papers

Dear Brazilian Government,I recently attended a fascinating conference on resource use in the rainforest. I matte like I had to write this letter. I believe I have a way to solve the rainforest problems. We all just have to rifle together.Okay, first of all the government leaders already gave the rubber tappers and Native Amazonians land reserves. Which gave the government more land the long lost native amazonians. plainly the Rubber Tappers and the Native Amazonians fell they have always been the first to be in the rainforest and should get most and but all the land. And the government feels they drive to share. That is this whole delima.Okay, I think that they should make the land deal towards the Native Amazonians and the Rubber tappers. I think this only because of the time they have survived on the rainforest resources. I have nothing against the Government, Ranchers, Settlers, ect. I will let the native amazonians and the rubber tappers get the 60% of all the land. Then th ey cant complain. They passive have plenty of trees and resources. The government and ranchers dont cut voltaic pile all the trees anyways. I believe that the groups will not be happy and excited but its a fair deal on my behalf. I think this is fair because the government had a chance to make urbanisation and it didnt work out to good. I just dont wantthem to ruin the rainforest We need it for air.With this as the new land reserve, I know that the Rubber Tappers, Enviromentalists, and especially the Native Amazonians. But they will still be very angry to see the rainforest being cut down to grow crops that dont grow good in the rainforest soil. I also think that the government,Ranchers, and settlers will be satisfied because they can understand( I HOPE) that the Amazonians were here to claim the land first. Besides they get 40% of all the land. They can have all they own resources to themselves and will get a mankind of the river and everything.

Construction: Depletion of Copper, Tin, & Zinc :: Geology

Construction Depletion of Copper, Tin, & ZincBuilding Construction procedures involve the erection of various types of structures. The major trend in present-day construction continues forward from handcrafting at the building site and toward on-site assembly of even larger, more integrated subassemblies manufactured away from the site. Construction in the United States is the product of a diverse group of subindistries, with many individuals and organizations involved in the construction of a single structure, from the manufacture of necessary components to final assembly. The major elements of a building ar as follows (1) the foundation, which supports the building and provides stability (2) the structure, which supports all the imposed loads and transmits them to the foundation (3) the exterior walls, which may or may not be part of the pristine supporting structure (4) the interior partitions, which also may or may not be part of the primary structure (5) the environmental- control systems, including the heating, ventilating, air-conditioning, lighting, and acoustical systems (6) the erect transportation systems, including elevators, escalators, and stairways (7) communications, which may include such subsystems as intercommunications, public address , and closed-circuit television, as well as the more usual telephone fit out systems and (8) the power, water supply, and waste disposal systems.What is Copper? Copper, symbol Cu, a brownish-red metallic element is one of the most widely used metals. Copper was hunch over to prehistoric people and was probably the first metal from which useful articles were made. Copper objects have been found among the remains of many ancient civilizations, including those of Egypt, Asia Minor, China, southeastern Europe, Cyprus ( from which the word bullshit is derived), and Crete. Because of its many desirable properties, such as its conductivity of electricity and heat, its resistance to corrosion, its malleabi lity and ductility, and its beauty, copper has long been used in a wide class of applications. The principle uses are electrical, because of coppers extremely high conductivity, which is second only to that of silver. It can be used in outdoor power lines and cables, as well as in house wiring, lamp cords, and electrical machinery such as generators, motors, controllers, signaling devices, electromagnets, and communications equipment. Pure copper is soft but can be hardened more or less by being worked. Alloys of copper, which are far harder and stronger than the pure metal, have higher resistance and so cannot be used for electrical purposes.

Is Alcohol Harmful To Our Life? :: essays research papers

So much information about adverse effects of alcohol is known. Yet, a large(p) number of people condone what is known to them. Overlooking the negative effects of alcohol roll in the hay turn the alcohol into a deadly weapon. Alcohol can cause deaths, diseases, and family problems.Alcohol can end your life in a matter of a second. According to, Alcoholism New Insights on Old Problem, much than 100,000 Americans die from alcohol related causes (1). In fact, alcohol related deaths are five times greater than the number killed by all illicit drugs combined. When a person imbibe an alcohol, he or she becomes disoriented. When people drive under this condition, they expose themselves to a great danger. In addition, women become more easily elate from alcohol than men more (2). In result, women buzz off themselves killed from an alcohol than males.Alcohol can also cause many diseases. When you drink too much of an alcohol, you get hallucinations and memory losses. Alcohol specifical ly affects the control centers of the brain (Valiant 337). If people do not get help for alcoholism, the condition could be debilitated. It could eventually lead to Korsakoffs syndrome of which symptoms would be mental confusion, hallucinations, and paralysis of hands and feet (Blum 337). This disease can get worse than they already have.Finally, alcohol can lead to poor family relationship. Alcohol and Family states that American research found that 49% of child abusers were drinking of the time of the offense and 34% were heavy drinkers (1). Alcoholics tend to abuse children just to make themselves feel better. In 1997, Institute of Alcohol Studies estimated that there are likely to be one million children in Britain living with a parent whose drinking has reached harmful levels (2). These spare children get beaten everyday without knowing what is going on. There are many other things that have not been mentioned. There are more diseases caused by the alcohol which we still do no t know today. The death rate on an alcohol is climbing every day.

The War Between The Classes :: essays research papers fc

The War Between the Classes By (Your Name Here) The War Between the Classes is an excellent book written by Gloria D. Miklowitz. It is about a high-school phratry that plays the Color Game. In the game, there be four social classes which are represented by armbands Blues highest, richest Dark super C upper-middle class, semi-rich Light Greens lower-middle class, semi-poor Oranges lowest class, very poor. To further split up the classes, there are the superior sex, Teks(females), and the inferior sex, No-Teks(males). There are also groups of Color Game policemen, which are older students who played the game in previous years. They record the students activities, and record any good or bad behavior, which can result in demotions or promotions. The Color Game runs like this Lower classes, or No-Teks, must bow when they meet eyes with a higher class, or Tek. Higher classes can declare orders to lower classes. Lower classes may not speak to a higher class unless spoken to, and ca n only reply in a neat answer. You must have your armband and journal with you at all times. The main character in this book is Emiko Amy Sumoto. She comes from a Japanese family, and her parents believe she should keep the family going by marrying a Japanese boy. Instead, she is interested in a rich, white boy names Adam, which is the opposite of her. In the Color Game, all the Latinos in the class discharge out to be high colors, and rich whites end up as lower colors, which are all planned out by their teacher. Although she is used to cosmos treated as a lower person in real life, along with the rest of the Latinos, she doesnt feel right with the power she has, being oneness of the most powerful people in the class. She decides to try and unite all the colors to an equal rank. After being demoted from Blue to Orange with Adam, she plans to post meld All Colors posters all over the school, and make quad-colro armbands for all students to wear. Finally she succeeds in doing th is, and unites the whole school as one. My favorite part of this book is when Amy and her booster unit Juan sneak into the school at night and post the posters all over the school. I like this part because it sounds very fun to do, and its the only essential action part or the book.