Organizational Planning Exxon Mobil Corporation

Organizational Planning Exxon Mobil Corporation Exxon Mobil Exxon Mobil Corporation is a Fortune 500 American multinational oil and gas firm headquartered in Texas, United States. The company is the world’s second largest firm by revenue after Wal-Mart during the fiscal year 2013. The firm is also the second largest publicly traded corporation based on its market capitalization.Advertising We will write a custom research paper sample on Organizational Planning: Exxon Mobil Corporation specifically for you for only $16.05 $11/page Learn More Exxon Mobil Internal and External Stakeholders Internal stakeholders Employees are responsible for daily operations of the company. Exxon Mobil leverages on its employees to create competitive advantage in the industry. Shareholders provide financial support for the company and expect returns on their investments. External stakeholders Governments are responsible for regulating the oil and gas industry in which the company operates. These regulations may favor o r introduce stringent measures that can affect business operations and revenues. Suppliers are Exxon Mobil partners that provide required products and services to support the company’s operations. Customers buy the company’s products and services. They continue to demand high quality products and services from Exxon Mobil. Communities are spread globally in areas where Exxon Mobil runs its operations. The company must protect environments and communities in such areas through CSR activities.Advertising Looking for research paper on business economics? Let's see if we can help you! Get your first paper with 15% OFF Learn More NGOs continue to watch operations of Exxon Mobil with the aim of protecting environments and human rights. Academic institutions work with the company to develop the best technologies and management practices in the industry. Exxon Mobil Vision and Mission Mission â€Å"Exxon Mobil Corporation is committed to being the wor ld’s premier petroleum and petrochemical company. To the end, must continuously achieve superior financial and operating results while simultaneously adhering to high ethical standards†. From this mission statement, Exxon Mobil focuses on making high returns and profits, and it has been successful on this mission. Moreover, it also operates under ethical principles that guide its relationship with all stakeholders. Exxon Mobil Goals Global expansion – a strategic plan Exxon Mobil continues to expand globally. The company can focus on strategic partnership with countries, which have recently discovered oil and gas, especially in Africa. It may also seek further alliances with oil-rich countries. This would ensure global presence and high returns for investors. Meeting energy demand The company will have to continue to invest in energy in order to meet the rising global demand. The use of hydraulic fracturing – an operational plan The use of hydraulic fractu ring to extract shale gas has brought about environmental issues. On this regard, Exxon Mobil can leverage on the best technologies in order to enhance operational efficiency with the aim of reducing environmental pollution and increasing output from the well.Advertising We will write a custom research paper sample on Organizational Planning: Exxon Mobil Corporation specifically for you for only $16.05 $11/page Learn More Emission reduction By enhancing efficiency through technologies, the company can reduce emission of greenhouse gas on a long-term basis. SWOT Analysis Strengths Exxon Mobil is the leading oil and gas company globally. Strong financial performance Adequate capital for investments, for instance, the company plans to invest about $38 billion per year through 2017 to meet the increasing energy demands by consumers Leveraging on technology for efficiency Weaknesses Decline in profits because of the reducing oil and gas reserves and productio n Too many legal issues Slow pace of using technologies for efficiency Opportunities Increasing oil and gas demands, especially in Asia New oil blocs in Africa Massive capital for investment New partnership Alternative energies Threats Economic slowdown in the US and Europe Stiff regulations by governments The industry’s fierce competition Instability in countries like Nigeria and the Middle East region Constant demands by NGOs and human right activists, especially about hydraulic fracturing technologies and oil spill (Germain and Mendola, 2013) References Biers, J. (2014). ExxonMobil profits fall as oil, gas output dips. Web. Exxon Mobil Corporation. (2014). About Us: Guiding Principles. Web. Germain, T., and Mendola, G. (2013). What Are Exxon, Shell, And ConocoPhillips Doing With Their Billions In Q2 Profits? Web.

PROJECT MANAGEMENT Essay Example | Topics and Well Written Essays - 750 words

PROJECT MANAGEMENT - Essay Example ontingency to accommodate the risk of incurring unidentifiable but normally occurring costs within the defined scope† (â€Å"What is Cost Baseline,† n.d.). This is referred to as a â€Å"financial plan prepared for every major expense category, such as administrative cost, financing cost, production cost† ( â€Å"Cost Budget†; â€Å"Budget,† n.d.). It essentially contains the list of all planned and expected revenues and expenses which is defined by Sullivan & Sheffrin (2004) as the â€Å"plan for saving and spending.† This is considered as one of the vital plans to be taken up before starting to operate a business because this report helps in the proper allocation of resources, â€Å"evaluates performance and formulates plans† (Ward, n.d.). Cash flow report is also called as the statement of cash flows or funds flow statement (Helfert, 2001). Previous accountants termed this as the flow of funds statement (Bodie, Kane & Marcus, 2004). This report mainly tackles on the change of cash all throughout a business year. The change of cash involves three major categories; operating cash flow, investing cash flow, and financing cash flow (Comiskey & Mulford, 2000). It is further defined by Erich Helfert (2001) as the â€Å"financial statement that shows how changes in balance sheet accounts and income affect cash and cash equivalents, and breaks the analysis down to operating, investing, and financing activities.† This report has been employed by companies because â€Å"it eliminates allocations which might be derived from different accounting methods, such as various timeframes for depreciating fixed assets† (Epstein & Jermakowicz, 2008). This report is usually used by companies to determine â€Å"the costs of multiple resources for all periods during which the resources are available between a specified start and end time† (â€Å"Resource Costs Summary Analysis,† n.d.). It is quite helpful to minimize certain unnecessary expenditures and to find out practical and long-term

Art history term Assignment Example | Topics and Well Written Essays - 2750 words

Art history term - Assignment Example 56). it is an ancient Roman statue in Rome Italy. It is made of bronze and is 4.24m tall. It shows many similarities t the standing statues of Augustus. The original one is n display in the Capitoline Museums (Hourihane and Colum, 2012, P. 56). they were initially described by a German archeologist. They were delineated from the excavation of wall paintings at Pompeii. The pictures also tell about the prosperity of the area. The principal purpose of the frescoes was to minimize the claustrophobic interiors of Roman rooms (Hourihane and Colum, 2012, P. 56). it has a halo around the head of Emperor Justinian. He stands in the middle. Empress Theodora is depicted as the goddess. The mosaic with her shows figures moving from left to right of the church (Hourihane and Colum, 2012, P. 72). the symbolism declares the promised salvation of man in the next world. The four lunettes from across. The picture shows that Jonah was cast from a ship. He then went into a belly of a whale (Hourihane and Colum, 2012, P. 72). it is the site of 6th and early 7th centuries. One of them contained an undistributed ship burial. It sheds light on a period of English history. The has been crucial to understanding the Anglo-Saxon kingdom (Hourihane and Colum, 2012, P. 72). it contained many grave goods and two female human skeletons. The interment of the ship into its burial mound dates from 834 AD. The parts of the ship date from around 800. The ship seems to be older (Hourihane and Colum, 2012, P. 72). the most visible symbol was the palace itself. The palace chapel was placed in a central octagon. The Statute was intended to be set up with a fountain in front of the chapel. At the time, it was called the Renovation (Hourihane and Colum, 2012, P. 72). There was the inclusion of traditional symbols. The symbols are the Eagle of John, the Lion of Mark, and

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. 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