A Personal Take on the Debate Between Rationalism and Empiricism.Doc Essay Example for Free

A Personal Take on the Debate Between Rationalism and Empiricism.Doc Essay The study of knowledge, or epistemology, contains theoretical methods by which information is learned. Of these methods, two are most widely accepted. These two methods, rationalism and empiricism, are also the most widely debated methods of knowledge acquisition. Rationalism claims that knowledge is gained by a priori processes and intuition. Rationalism claims that knowledge is innate; however the level of innate knowledge contained by humans varies amongst rationalists. At the other end of the spectrum, empiricism claims that knowledge is gained largely by experience, observation, and sensory perception. These views pose a striking contrast and controversy within the theory of knowledge. Which view is correct, or is there even a correct view? As rationalism and empiricism are studied and compared, it becomes evident that empiricism is the more correct theory of the acquisition of knowledge. However, in order to believe so, there must be a differentiation between knowledge and behavior. According to the empirical scientific process, bodily behavior and function is rationalist. That is, it occurs without humans first learning how to breathe and pump blood with their heart. Knowledge however, refers to The British philosopher John Locke is credited with formulating the complete modern doctrine of empiricism. Locke proposed that, upon entrance into the world, the mind is a white paper upon which experiences leave their marks. According to Locke in his Essay Concerning Human Understanding the predominant sources of ideas and knowledge are sensation and reflection. It seems that after receiving knowledge empirically, the human mind resorts to reflecting on the information. This reflection could ultimately lead to the internalization of knowledge, therefore making it seem innate upon recall of the information. Scottish philosopher David Humes thoughts and theories regarding empiricism are the basis of what is understood as empiricism today. Humes studies on empiricism took empiricist ideas to a whole new level. Hume divided all of knowledge into two categories: relations of ideas and matters of fact. Relations of ideas encompass logical propositions such as mathematics and geometry, while matters of fact are pieces of knowledge dependent on observation. Hume goes even further in saying that ideas, commonly understood as arising from human intuition (rationalism), are empiricist. According to Hume, ideas are merely remembrances of impressions or sensations gained by experience and observation. Humes ideas here are not unreasonable. While ideas can be new or innovative they generally do build upon the knowledge already possessed by experience. For example, the iPod was a new idea; however the idea itself was a remembrance of previous portable music devices such as the Walkman or Discman. In effect, Hume seems to be saying that new ideas are simply improvements made to existing ideas gained through impressions and sensations. While rationalism and empiricism are generally recognized as opposing views, it is important to remember that they are not mutually exclusive when understood in a general sense. However, when a philosopher is looking for the fundamental source of all knowledge, then one view must be discarded in favor of another. By separating human knowledge from human body function, it is reasonable to conclude that all human knowledge and ideas are gained empirically and through experience.

The Neurobiology of Anxiety Disorders: A Preliminary Investigation Essa

The Neurobiology of Anxiety Disorders: A Preliminary Investigation When I first began my research for this paper, I was primarily interested in learning more about the role of serotonin in the treatment of anxiety disorders. While I did discover that serotonin is important, especially when it comes to understanding the latest drugs being prescribed by doctors to combat anxiety symptoms, I also learned that researchers are pursuing a number of other "leads" in investigating the neurobiology of anxiety disorders. There has been evidence suggesting that a particular gene, or genes, may be associated with the development of anxiety disorders (1). In addition, the circuitry of the amygdala, an area of the brain that regulates fear responses, is now being studied (2). First, I will briefly summarize my findings regarding serotonin, and then I will offer my own personal reaction. I will focus my response around Social Anxiety Disorder, one of a number of anxiety disorders that are diagnosed and treated today. Anxiety disorders are the most common mental illnesses in America, affecting approximately 19 million adults (3). Although everyone experiences mild symptoms of anxiety at some point in their lives, those who suffer from an anxiety disorder have chronic and intense bouts of panic. They may fear or dread common social situations such as being out in public with a group of friends (4), or experience full-blown panic attacks (5) that make it impossible to go grocery shopping or to get to work in the morning. If untreated, anxiety disorders can severely impact the quality of one's life, and symptoms may grow even worse over time. There are several types of anxiety disorders, including Panic Disorder, Obsessive-Compulsive Disor... ...c internet resource http://www.algy.com/anxiety/files/barlow.html 6)Serotonin, from Department of Psychology, California State University http://www.csuchico.edu/psy/BioPsych/serotonin.html 7)"The Physiology of Panic Disorder, Part II", from Panic/Anxiety Disorders on about.com http://panicdisorder.about.com/health/panicdisorder/library/weekly/aa043097.htm 8)"Drug May Help in Rx, Education of Panic Disorder", from The Medical Post, January 29, 1996, found on Internet Mental Health http://www.mentalhealth.com/mag1/p5m-pan1.html 9)Paxil, from SmithKline Beecham http://www.paxil.com/ Other Resources 1)The Neurobiology of Childhood Emotion: Anxiety, from The American Psychoanalyst, Vol. 32, No. 2 http://www.apsa.org/tap/anxiety.htm 2)The Neurobiology of Depression, from Scientific American, June 1998 http://www.sciam.com/missing.cfm The Neurobiology of Anxiety Disorders: A Preliminary Investigation Essa The Neurobiology of Anxiety Disorders: A Preliminary Investigation When I first began my research for this paper, I was primarily interested in learning more about the role of serotonin in the treatment of anxiety disorders. While I did discover that serotonin is important, especially when it comes to understanding the latest drugs being prescribed by doctors to combat anxiety symptoms, I also learned that researchers are pursuing a number of other "leads" in investigating the neurobiology of anxiety disorders. There has been evidence suggesting that a particular gene, or genes, may be associated with the development of anxiety disorders (1). In addition, the circuitry of the amygdala, an area of the brain that regulates fear responses, is now being studied (2). First, I will briefly summarize my findings regarding serotonin, and then I will offer my own personal reaction. I will focus my response around Social Anxiety Disorder, one of a number of anxiety disorders that are diagnosed and treated today. Anxiety disorders are the most common mental illnesses in America, affecting approximately 19 million adults (3). Although everyone experiences mild symptoms of anxiety at some point in their lives, those who suffer from an anxiety disorder have chronic and intense bouts of panic. They may fear or dread common social situations such as being out in public with a group of friends (4), or experience full-blown panic attacks (5) that make it impossible to go grocery shopping or to get to work in the morning. If untreated, anxiety disorders can severely impact the quality of one's life, and symptoms may grow even worse over time. There are several types of anxiety disorders, including Panic Disorder, Obsessive-Compulsive Disor... ...c internet resource http://www.algy.com/anxiety/files/barlow.html 6)Serotonin, from Department of Psychology, California State University http://www.csuchico.edu/psy/BioPsych/serotonin.html 7)"The Physiology of Panic Disorder, Part II", from Panic/Anxiety Disorders on about.com http://panicdisorder.about.com/health/panicdisorder/library/weekly/aa043097.htm 8)"Drug May Help in Rx, Education of Panic Disorder", from The Medical Post, January 29, 1996, found on Internet Mental Health http://www.mentalhealth.com/mag1/p5m-pan1.html 9)Paxil, from SmithKline Beecham http://www.paxil.com/ Other Resources 1)The Neurobiology of Childhood Emotion: Anxiety, from The American Psychoanalyst, Vol. 32, No. 2 http://www.apsa.org/tap/anxiety.htm 2)The Neurobiology of Depression, from Scientific American, June 1998 http://www.sciam.com/missing.cfm

Strain Controlled Triaxial Test- Geotechnical Engineering

1. INTRODUCTION From civil engineering view, Soil is the medium through which the structural loads are transferred safely and efficiently. Soil should be consistent enough to satisfy the requirements even under inevitable circumstances like earthquake, bomb reactions etc. It is necessary to incorporate the seismic effects into the soil properties. Like concrete or steel, engineering properties of soil cannot be found out using theory of classical dynamics and vibrations. It can be found only field and lab tests. To quench the above requirement, various techniques are employed nowadays. The most common methods are cyclic simple shear, cyclic triaxial shear and cyclic torsional shear tests. The dynamic triaxial test is the most effective method to arrive the static and dynamic properties of soil like cyclic deformation, damping ratio, liquefaction strength etc. Though it has some limitations, it is widely used for the analysis of soil under seismic forces. The fundamental parameters obtained from this test are cyclic shear stress and cyclic shear strain, through which the soil is defined. The tests can be done either by stress controlled (cyclic shear stress) or strain controlled (cyclic shear strain). The test setups are highly sophisticated and costly. It needs highly skilled labour. The measuring devices used in the system needs to be calibrated and sealed properly as it is more sensitive to disturbances. The results obtained reflect the site seismic condition to the maximum level provided the strain level is kept minimum. Fig 1. 1 Triaxial Cell Fig 1. 2. A typical Cyclic triaxial apparatus 1. 1WHY DYNAMIC TRIAXIAL The Dynamic forces are time dependent and are usually cyclic in nature i. e. they involve several cycles of loading, unloading and reloading. Earthquake is three dimensional in nature. Hence the shear waves and body waves produced by the earthquake tend to deform the soil in all the directions (for the horizontal level ground). Dynamic Triaxial tests actually reflect the soil condition (in all round stresses) in the site. During earthquakes, the seismic waves cause the loose sand to contract and thereby increasing the pore water pressure. Under undrained loading, development of high pore pressure results in upward flow of water, thereby making the sand in liquefied condition. Pore water pressure is measured effectively in triaxial tests. Among the stress-control and strain-control condition, strain control is adopted widely. This is because; stress-control test has great sensitivity to the sample disturbance. In case of strain-control, pore pressure developed during tests is less affected by specimen fabric and density. The tests can be done on intact specimens and reconstituted specimens. While comparing the results obtained from intact and reconstituted specimens, there is much deviation in stress-control compared to strain-control. (tests done by vucetic and dobry, in 1988). Stress path control is used in the study of path dependence of soil behaviour. Stress deformation and strength characteristics depend on initial static stress field, initial void ratio, pulsating stress level and the frequency of loading. 1. 2APPLICATIONS There are variety of engineering problems which rely heavily on the behaviour of soils under dynamic conditions. These includes design and the remediation Of machine foundation, geotechnical earthquake engineering, protection against construction vibration, non-destructive characterization of the subsurface, design of offshore structures, screening of rail and traffic induced vibrations, vibration isolation etc. When it comes to dynamic triaxial test, the wide range of application is the liquefaction behaviour of soil under seismic forces. 2. HISTORY One of the first pieces of equipment designed to test cyclic triaxial loading was the pendulum loading apparatus by Casagrande and Shannon in 1949. This utilizes the energy of the a pendulum which when released from a selected height, strikes a spring connected to the piston rod of a hydraulic cylinder, this cylinder is further connected to another cylinder located above the cel. The time of loading was between 0. 05 and 0. 01 sec. Fig. 2. 1. Pendulum Loading Apparatus Casagrande and Shannon came up with an equipment called Falling Beam Apparatus as shown in Fig. 2. 2 In 1960, Sead and fead used Pneumatic System for cyclic loading. It marks the evolution of the dynamic triaxial shear apparatus. Fig. 2. 2. Falling Beam Apparatus 3. PRINCIPLE First attempt was made by Seed and Lee (1966) by consolidating a saturated sample under a confining pressure and subjected to constant amplitude cyclic axial stress under undrained conditions. This test was performed till they deformed to a certain amount of peak axial strain. Under this condition creates a stress conditions on a plane of 45 ° through the sample which is the same as those produced on the horizontal plane in the ground during earthquakes. This is the basis on which the cyclic triaxial test works. Fig. 3. 1. Simulation of geostatic and cyclic stress in triaxial test. Shear stress is taken into account as it causes deformation. To incorporate seismic effects, uniform shear stress for a given cycle is adopted for non-uniform stress time data. To achieve that a maximum shear stress is multiplied by a correction factor ?. Then the test is carried out till required deformation or failure to occur. 4. EQUIPMENT 4. 1. Parts of Dynamic triaxial apparatus suggested by ASTM D 3999 – 91(2003) APPARATUSPURPOSECONSIDERATION 1. Triaxial Pressure CellTo mount sample and conduct testTolerance for piston, top platen & low friction piston seal. Ball bearings and friction sealTo minimise frictionFriction can be,  ±2 % of the maximum single amplitude cyclic load Load rodTo facilitate loadingdia = 1/6th of specimen dia Specimen cap & BaseTo provide a sealed platform Rigid, non corrosive, impermeable, Cap weight < 0. 5% of applied axial failure load (static), Valves To regulate back pressure, cell pressure, pore water pressureLeak-proof, withstand applied pressure Top and bottom platensTo facilitate loading and provide a rigid baseProper alignment, load rod sealed with top platen with friction seal. 2. Cyclic Loading EquipmentTo induce cyclic loads Uniform sine wave @ 0. 1 to 2 Hz, simple ram or a closed loop electro hydraulic system 3. Recording EquipmentsTo record the data obtainedProperly calibrated Load MeasurementTo measure the cyclic loadsElectrical, analog or digital Axial deformation MeasurementTo measure the strain rateLVDT or dial guages Pressure ControlTo regulate cell pressureMercury or pneumatic device Pore Pressure transducerTo measure pore pressureTransducers or electronic pressure meters Volume change MeasurementTo check the volume change in the specimenCalibrated and widely used guages 3. Miscellaneous a. Rubber membrane b. Filter paper To hold the specimen To facilitate saturation Leak-proof with minimum restraint Must not cover more than 50% of the specimen. Fig. 4. 1. Schematic Diagram of a stain-controlled dynamic triaxial test 4. 2WORKING PROCEDURE The working mechanism mainly involves three phases a)Saturation phase:Initially the sand is sample saturated by applying cell and back pressure simultaneously. (cell pressure > back pressure) b)Consolidation phase: during test, void ratio should be kept constant. It is obtained in this phase. Back pressure valve is closed. )Load Phase: Actual test begins here. Strain rate is fixed using gear system. Cyclic load is applied either using hydraulic or pneumatic type. Loads and corresponding strains are recorded at loading, unloading and reloading. Test is continued until the required strain or failure occurs. 5. RESULTS From the cyclic triaxial test, we can obtain various graphs for detailed analysis, †¢Load Vs Deform ation †¢Deviatoric Stress Vs Time †¢Axial Strain (%) Vs Time †¢Excess Pore Pressure Vs Axial Strain (%) †¢Excess Pore Pressure Vs Time †¢Deviatoric Stress Vs Axial Strain (%) Fig. 5. 1. Axial load Vs. axial deformation From the hysteresis loop obtained, the dynamic Young’s modulus (Ed) can be calculated, from which shear modulus (G) can be calculated using poisson’s ratio ( µ). Damping factor (D) can also be calculated from the loop obtained. Shear Modulus, G = Ed / 2(1+ µ) Damping factor,D = Ai / 4? At Ai ? Area of Loop At ? Area of shaded portion 6. Discussions: Two series of undrained cyclic triaxial strain controlled tests were performed by Mladen Vucetic and Richardo Dobry, on two different Imperial Valley, California, silty sands which liquefied during an earthquake in 1981. Both intact and reconstituted specimens were tested. The cyclic shear strain is the fundamental parameter governing pore pressure buildup. The saturated deposit is composed of two layers: an upper, looser, sandy silt unit located between 2. 6 m and 3. 5 m depth, containing more fines (37%) (sand A), and the lower, loose to medium-dense sand unit located between 3. 5 m and 6. 8 m, containing less fines (25%) and (sand B). Selected plots of normalized cyclic shear stress, ? cy* = ? cy/? c„ and normalized residual pore pressure, u* = u/? c, versus number of uniform strain cycles, nc, up to nc = 30, are shown in Figs. 6. 1 and 4 for sands A and B, respectively, ? y above is the amplitude of cyclic shear stress acting on 45 ° planes within the specimen, with ? cy= ? dc/2 , where ? dc is the cyclic deviatoric stress amplitude, and u is the accumulated residual cychc pore pressure at the end of the pertinent strain cycle, derived from measurements at the point of the cycle at which the cyclic stress ? dc = ? cy = 0. Fig. 6. 1 Comparis on of results obtained on intact and reconstituted specimens of sand A The effect of sand fabric, that is, the difference between results obtained on reconstituted and intact specimens, is analyzed next for both sands A and B, with the help of Figs. . 1 and 6. 2. It can be readily noticed in these two figures that the residual pore pressures in cyclic triaxial strain-controlled tests are practically unaffected by the change of sand fabric (u* versus nc curves), while, on the contrary, soil stiffness is significantly affected (? cy* versus nc curves). This is especially noticeable in Fig. 6. 2. Fig. 6. 2 Comparison of results obtained on intact and reconstituted specimens of B. Fig. 6. 3 Residual pore pressure in reconstituted specimens of sands A and sand B It must also be noticed that the range of cyclic shear stresses measured at a given cyclic strain in Figs. . 1 and 6. 2, for the two sands and for the two types of specimen fabric, is quite wide, in contrast to the corresponding range of pore pressures in Fig. 6. 3, which is very narrow. This confirms once again that cyclic shear strain is the fundamental parameter governing pore pressure buildup, and that use of strain-controlled testing represents the most appropriate, as well as the most convenient, approach currently available for evaluation of seismic pore pressures and liquefaction of level ground sites. 7. FACTORS AFFECTING CYCLIC STRENGTH Effect of Confining Stress Critical void ratio is not a constant but decreases as confining pressure increases. The stress ratio decreases with increasing confining pressure. Effect of Loading Wave Form As the load data obtained from history are converted into uniform cycle by ?. The order of increasing strength was rectangular, triangular and sine Effects of Frequency on Cyclic Strength The frequency effects have only a minor (< 10 percent) effect on cyclic strength of the soils. The slower loading frequency have slightly higher strength. Effects of Relative Density At relative densities < 50%, complete liquefaction occurred almost simultaneously, and relative densities above 70% were required for safety against large strains. Effects of size & Gradation Well-graded material was somewhat weaker than uniformly graded material. This finding was attributed to a greater densification tendency in well-graded soils, as finer particles move into voids between larger particles, than occurs in uniformly graded soils. This densification tendency causes increased pore pressure. Effects of sampling on strain history Once a specimen has liquefied and reconsolidated to a denser structure, despite this densification, the specimen is much weaker to cyclic stresses reapplied. Effects of Over consolidation Ratio and Ko The maximum deviator stress required to cause a critical strain for a specified number of cycle’s increases with the Ko ratio. Also the cyclic strength increases as OCR and fines content increase. 8. VALIDATION The validation of the apparatus is done by successive tests, researcher’s experience and available equipments. Mladen vucetic and richardo dobry conducted two series (Intact and Reconstituted Specimens) of undrained cyclic triaxial tests on Imperial Valley, California, silty sands which liquefied during an earthquake in 1981. The results were compared and the experimental set up was validated. Further the tests were conducted on different types of sand and validated. 9. DEVELOPMENTS Since 1966, there has been a considerable improvements in the triaxial testing apparatus meeting results of higher accuracy and efficiency. Initially stress controlled methods were used, then strain controlled methods were adopted. To apply loads, initially hydraulic jack was used, then pneumatic system was used and then electro piezometer. Likewise there are so many advancements of triaxial tests. Some of the advancements are discussed below. Chan (1981), and Li et al (1988) Fig. 7. 1. , have developed a popular electro-pneumatic apparatus which incorporates many advancements in apparatus design and operation. Fig. 9. 1. Electro-pneumatic Apparatus Automated Cyclic Triaxial system is the next development, which is the most comonly used apparatus. It is well known for its automated input and output System, data acquisition and quick results. Fig. 9. 2. Automated Triaxial System 9. 1 RECENT ADVANCEMENTS GDS Entry level Dynamic triaxial testing system ?Technical Specifications ?Maximum Operating Frequency: 5Hz ?Minimum Operating Frequency: < 0. 001Hz ?Highly accurate dynamic, electro-mechanical actuator ?Available sample sizes (depending on cell selection): 38 x 76mm (or ? 39. 1 x 78. 2mm) to ? 150 x 300mm. Fig. 9. 3. GDS ELD ? 16-Bit dynamic data logging ?16 Bit dynamic actuator control channel ?Cell pressure range to 2MPa (dependent of cell choice) ?Small laboratory foot print No hydraulic power pack required ?Standard Triaxial cells can be used (upgraded to dynamic seals and bearings) ? Can be upgraded to perform P and S wave bender element testing. ?Can be upgraded to perform unsaturated triaxial testing with the addition of the following items: a)Unsaturated pedestal with high air entry porous stone. b)1000cc digital air Pressure/volume controller (ADVDPC) for the applicati on of pore air pressure and measurement of air volume change c)Optional HKUST double cell (available in the data sheet ‘Unsaturated Triaxial Testing of Soil (UNSAT). As well as dynamic triaxial tests, the ELDyn system can be utilised to carry out traditional triaxial tests such as UU, CU and CD as well as more advanced tests such as stress paths, K0 and Resilient Modulus tests. HS28. 610 cyclic triaxial test system is also a sophisticated apparatus available in Newdelhi (India). DYNATRIAX is another advanced cyclic triaxial equipment available at many places Los Angeles, Poland and many countries. It can operate at a maximum frequency of 10Hz. 10. CONCLUSION Many innovative systems for cyclic loading of soil have emerged in geotechnical engineering. Each system has its unique advantages and limitations. Some ways of minimizing these limitations have been pointed out. The advanced equipments are an additional tool for performing cyclic loading, in particular liquefaction testing. Extreme care must be used in preparing remoulded sand specimens, and special attention must be paid to testing techniques in order to obtain reproducible test results. In particular, the method of specimen preparation, the shape of the loading wave form, and the preciseness of density determinations greatly affect cyclic strength. Hence, development of ASTM standards for cyclic triaxial testing should include consideration of these factors in the results of this investigation. 11. REFERENCES: ASTM D 3999 Determination of Modulus and Damping Properties of Soils Using the Cyclic Triaxial Apparatus Advanced triaxial testing of soil and rock – Page 484 by Robert T. Donaghe, Ronald C. Chaney, Marshall L. Silver Chan, C. K. , 1981, â€Å"An Electropneumatic Cyclic Loading System,† Geotechnical Testing Journal, ASTM, Vol. 4, No. 4, pp. 183-187. Dynamic Geotechnical Testing H Ronald J. Ebelhar, Vincent P. Drnevich, and Bruce L. Kutter. STP 1213 ASTM Publication Dynamic Geotechnical Testing : a symposium by Marshall L. Silver Khosla, V. K. and Singh, R. D. , â€Å"Apparatus for Cyclic Stress Path Testing,† Geoteehnical Testing Journal, GTJODJ, Vol. 6, No. 4, Dec. 1983, pp. t65-172. Fundamental of Soil Dynamics and Earthquake Engineering By Prasad. Soil Liquefaction, a critical state approach by Mike Jefferies & Ken Been Kramer, Steven L. , Geotechnical Earthquake Engineering, Prentice-Hall, Inc. , Upper Saddle River, NJ, 1996 Townsend, F. C, â€Å"A Review of Factors Affecting Cyclic Triaxial Teste,† Dynamic Geotechnical Testing, ASTM STP 654, American Society for Testing and Materials, 1978, pp. 356-383.

Labour Market Context - 11897 Words

4 The Labour Market Context of HRM Chapter Objectives †¢ To define internal and external labour markets †¢ To outline the role of HRM as the interface between an organisation and its labour markets †¢ To identify the changing labour market conditions under which contemporary organisations operate †¢ To critically evaluate the implications for HRM of the ‘knowledge economy’ †¢ To outline how labour market trends are impacting upon how organisations utilise labour and how HRM practices are driving labour market change †¢ To outline the various ways that firms can respond to different labour market conditions †¢ To outline the notion of organisational flexibility and how various forms of flexible working practices impact†¦show more content†¦The latter 90 04-Wilton-4081-CH-04.indd 90 HRM IN CONTEXT 25/08/2010 7:10:18 PM refers to a strategy of recruiting required labour from outside the firm as and when needed. A ‘make’ strategy is, therefore, internally-focused whilst a ‘buy’ strategy is externally-focused. The internal labour market The internal labour market refers to that which exists within a single organisation and represents its internal supply or stock of labour. In its broadest sense, the internal labour market is the mechanism by which existing employees are attributed particular roles within a firm. The specific characteristics of an organisation’s internal labour market are reflective of a number of HR policy emphases, for example, the level of investment in employee training and development, the availability of career development opportunities and the extent to which employee retention and job security are prioritised. Contextual factors, particularly the types of skills, knowledge and attributes required, also act to shape the ‘type’ of internal labour market that exists within a firm. 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