Using Pneumatic And Hydraulic System Engineering Essay

Using Pneumatic And Hydraulic System Engineering Essay Automation is the integration of mechanical, computer electronic based activities the control of manufacturing processes in the field of production. Different techniques of automation are carried using pneumatic, hydraulic system, cam follower computer system. In this project of automation of burr cleaning process, I have selected and implemented the pneumatic technique of automation. For automation, I have designed manufactured air blowing machine, which is operated with the help of pneumatic system controlled by PLC. In this mechanism the DLL nozzle is run over the guide way clamp by pneumatic cylinder. Then the air pressure of 5 bars is supplied to the tip of nozzle through jet which cleans the burr form nozzle ball end. I assembled air blowing machine with pneumatic cylinders for clamping, unclamping, supporting individualizing purpose, proximity sensor other necessary components. In this automation of air blowing machine I studied different types of machining processes, pneumatic system, and PLC system. After automation of air blowing machine the working stress on operator is reduced the production rate is substantially increased with improvement in quality of burr cleaning process. Chapter 1 : Introduction This project identifies and describes the automation process used to clean and deburr the nozzle which is present in fuel injection system, through the working of Air blowing machine. Air blowing machine uses different concepts of automation such as pneumatic, hydraulics, cam-follower etc. The main function of this machine is to control manufacturing process in production. 1.1.Background Nozzle is one of the vital component in any fuel injection system which is attached to the nozzle holder. It is integral and important part of an injector which regulates the flow of fuel to the ultimate ignition compartment.. According to Sean Bennet all Diesel engines (DI) are directly injected. The fuel is injected into the cylinder immediately above the piston. Atomization is necessary for the injected fuel. Atomization of the fuel requires breaking it up into very small liquid droplets. These droplets are produced by forcing very high high-pressure fuel through minutely sized orifices or holes. The smaller the droplets, the faster it will vaporize and ignite when it is propelled into the engine cylinder. The size of droplets that exits the injector depends on following factors : Size of Orifice: The diameter of the orifice determines the size and flow of in the system. It does not change after it has been manufactured. Pressure :Injection pumps manages the pressure in nozzles. The higher the pressure, the smaller the droplets exiting the nozzle. The means to inject the fuel into the cylinder is an injector nozzle. Injector are further subdivided in two types with respect of an electronically controlled pump and injector components : Multiple-orifice hydraulics nozzles. Electrohydraulic nozzles. Injector nozzles are mostly used in diesel engines, marine engines, locomotives and automobile industrial equipments .The main function of nozzle is to convert the diesel into diesel vapours and spray it on the piston. Injector nozzles are widely used in American tanks. Figure 1.1 External view of injector/orifii nozzle (Courtesy of Robert Bosch GmbH,www.bosch-presse.de) The main users of nozzles are Nissan, Mitsubishi while Bosch is one of the leading manufacturers of these nozzles .Manufacturing process of this nozzle is carried through several operations after case hardening. These operations are drilling, grinding and pinning of the orifice. After the compete process of pinning, it is found that some metal particles and burr is remained at the orfii. In order to eliminate this particle nozzle testing machine is required to test the nozzle. 1.2 Issue : Air blowing operation is carried by an operator with the help of cylinder or jet directly attached to compressed air supply. To serve this purpose operator clamps the whole tray full of nozzles and then he reverse it. This gives more fatigue and stress to the operator because of its heavy weight. Then jet is placed on the ball end of nozzle and part gets clean. One part is been cleaned at a time. Furthermore, since inside of the nozzle body function as passage to the fuel ,if any chip or burr generated in cutting process remain on the nozzle body, it enters into the contact surface of the valve element and causes malfunction and fuel spillage of the valve element, which result into the loss of product reliability. The aim of the task is to make air blowing operation which is done after pinning to remove burr present inside the nozzle automatic and reliable, so the stress on operator is reduced with control manufacturing system. 1.3. Objectives : The main objectives of the project are stated as follows: To study and implement the pneumatic technique of automation for the successful working of the machine. To design and develop Air blowing machine which will be used in manufacturing and cleaning process of nozzle present in the fuel injection system. After the Research of Diesel Engine from Books and internet it is found that nozzle is one of the important part in fuel injection system. Nozzle development led to study the manufacturing processes of nozzle. Bosch company are the leading producers and patent of the diesel engine stated by Rudolf Diesel. In the general manufacturing process of nozzle after the case hardening, drilling, ball-grinding and pinning are important operation for the processing of the nozzle. However it is found out that during this operation burr or free metal particle gets collected inside the nozzle body. Introduction of Air blowing machine : To remove this burr or free metal particle Air blowing machine is introduced for the improved performance of the nozzle. Draft Design and 3d model: In order to build a successful Air blowing machine, design is very important to generate the safe and working model. Selection of materials, shape, parameters is the important factors to develop a 3D model of machine. Softwares like solid works, CES and some hand calculation is useful for the correct and accurate 3D draft design. Analysis and Results : After the complete design process of the machine the next and important stage is the mechatronic analysis. Pneuamatic and Electronics (PLC circuit ) techniques are used for the successful and automatic working of the machine. If these techniques are successful then go to the next stage or else go back and recheck the 3D model again. After the analysis, results indicates the final consequence for the actions of the work. Validation of results gives the reality check of the project. If the validation is true then follow the next stage and conclude the project with the useful recommendations. Chapter three : Literature Review 3.1 Patent and Research : Bosch group is one of the leading manufacturers of these nozzles and equipment for motor vehicle. In early as 1863, the Frenchman Etienne Lenoir had tested and driven a vehicle which was powered by a gas engine which he had developed. However, this vehicle proved insufficient for installing in and driving. It was not until Nikolaus August Ottos four-stroke engine with magneto ignition that operation with liquid fuel and thereby mobile application were made possible. But the efficiency of these engines was low. Rudolf Diesel then developed an engine with much higher efficiency and to pursue his idea through higher efficiency and to pursue his idea through manufacturing. In 1897, in cooperation with Machinenfabrik Augsburg-Nurnberg ,Rudol Diesel built the first working prototype of a combustion engine to be run on inexpensive fuel oil. However due to heavy weight of the engine, it wasw not considered for use in land vehicle. But with further improvements in fuel injecton and mixture formation, Diesels innovation caught on and there were no longer any viable alternatives for marine and fixed-installation engines.(Adopted from Robert Bosch Gmbh, DIESEL-Engine Management by Wiley 4t edition et al 2005) In 1886,Robert Bosch (1861-1942), introduced a workshop for electrical and mechanical engineers in Stuttgart, Germany. Later on in 1897 Bosch opened ignition system in gasoline engines. In 1922,Robert Bosch turned his attention to diesel engine and hence started manufacturing accessory parts such as nozzles and fuel injection pumps. Rudolf diesel wanted to inject the fuel directly earlier in the system, but was unable to do this because of unavailability of the nozzles and fuel-injection pumps. In contrary these pumps were used in compressed-air injection, had to be suitable for back pressure reactions of up to several different atmospheres. Nozzles had to have quite fine outlet openings because the task fell upon the pump and nozzle is increased to atomize the fuel. Hence in 1922 Bosch wanted to develop the nozzles and fuel-injection pumps that fulfils the requirement of all the heavy-oil low power engines with direct fuel injection. 3.2 Development of the system : The demand of fuel injection equipment on such that it should be a capable of injecting even small amounts of fuel with only quite small differences, so that it should facilitate more smoother and constant at low idle speeds. The performance of this system depends highly on injection pressure which should be average or above 100 bar. The operating hours of the pump was over 2000 according to Bosch. Hence the need to develop the related equipments had grown immensely with application of materials and production engineering. In 1925, Bosch joined hands with Acro AG to utilize the Acro patents on a diesel engine system with related injected equipments(nozzle). Acro injection properties did not matched, Boschs own test system but it offered diesel engine which was suitable for small cylinder units and high speeds and this led Bosch to develop nozzle and fuel injection pump. Sooner the first diesel fuel-injection pump by Bosch was produced Nozzle were developed parallel to pump development. Hole type nozzle were added later after the introduction of pintle nozzle. The nozzle were adapted with their process and size. Engineering manufacturers also wanted a nozzle which could be used in spark plug on a gasoline engine. 3.3 Expert View : 3.4 Scope of improvement: Diesel fuel injection has greater degree of features in world of technology. The needle valve in fuel injection system opens and close nozzle more than million times in the service life of nozzle. It generates and provides pressure as high as 2,050 bar and depends on stresses such as: Temperature and pressure of the combustion chamber . Shock caused by continuous opening and closing. High flow related stresses during fuel injection. Below are the features of the nozzle and its processes: Injection duration is 1-2 milliseconds which is higher compare to sound wave from loudspeaker . Pressure in the fuel-injection chamber is more than 2,050 bar and it operates efficiently at such a high pressure. Injection duration in vehicle varies from very low range to high range,hence the amount of fuel is forced at very high velocity through a very small opening. The clearance of valve needle is 0.002 mm which is very minimal. Hence high technology demands an enormous amount of expertise in development, materials and manufacturing techniques. 3.2 Current stage : Processes on nozzle : During the manufacturing process when part is about to go through final processses,case hardeniing is done on it. After case hardening, part goes through two operation as folllows : Drilling of the Orifice Ball Grinding at ball end from outer surface. When nozzle comes out for drilling, it is first hardened. Then the orifice is drilled at the ball end. According to the requirement the number of orifice varies from 3-8.The diameter of orifice is within 0.3-0.4 mm.DLL nozzles are further classified in many types with number of orifice. Fig1.2:Orifice drilled at ball end Then the part is brought to grinding station, where part goes through outer grinding at the ball end. Fig 1. Grinding at ball end after drilling A metal burr is remained at the entrance of the orifice due to the grinding. This metal burr reduces the performance of the nozzle. Hence it is necessary to remove this burr .To serve this burr, pinning operation is done on nozzle so that burr gets removed. Fig:1.4 Metal burr remain at ball end due to grinding Pinning :- Pinning is the operation in which a needle having comparatively smaller diameter than orifice is attached to the small motor having speed of 300 rpm.This needle is then inserted in the orifice.Due to this the burr is removed and gets collected inside the nozzle at the ball end. These free metal particles reduces the performance of nozzle or can damage the nozzle inside the body.Its not an easy task to remove this free metal particle.An air pressure of 5-10 bar is blown inside the nozzle from ball end to come out from other end of the nozzle as shown in below figure Fig 1.5 Air blowing through orifice to remove free metal particle Chapter 4 : Design Introduction of Air Blowing Machine Fig: Air Blowing Machine 4.1 Introduction of Air Blowing Machine It is the machine used to remove the free metal particles present inside the nozzle body. The main function of this machine is to remove this free metal. To remove this metal air is been blown inside the nozzle at 5bar pressure. Pneumatic circuit is attached to the machine and it is controlled by PLC. Hence it is based on mechatronics. Mechatronics is the branch of engineering which is defined as the combination of mechanical and electronics engineering to improve quality, productivity and effective utilization of energy. Pneumatics deals with usage of compressed air to create motion and hence can be utilised for doing useful work. Certain characteristics of compressed air have made this medium suitable for the use in modern manufacturing and production plants. Introduction of pneumatics in the manufacturing process benefited with cheaper medium of industrial automation which if judiciously used, may bring down the cost of production to much lower level. Many mechanical task that came across can be achieved pneumatically in nozzle manufacturing process. 4.2 Material Selection of Materials : Material should be softer than Nozzle material. The optimum material is Mild Steel according to CES software Properties of mild steel (C3O) : Carbon percentage = 0.3% Modulus of Elasticity= 2.06105 N/mm ² Modulus of Rigidity = 0.79105 N/mm ² Poissons Ratio = 0.3 Tensile Strength = 600 to 750 N/mm ² Yield Strength = 400 N/mm ² Izod Impact Value = 55Nm Density = 7.7810 4.3 Hand -Calculation for Design : Angle of Inclination for the Guide way : Fig : Forces on Nozzle Data Found : Mass of nozzle = 200gm Co-efficient of friction = 8 % Weight (w) = 0.20 9.81 = 1.962 N Let, R= Reaction force. ÃŽ ¨ = Angle of contact Addition of forces in horizontal direction is zero. Hence, ÃŽ £Fx = 0 R = w cos ÃŽ ¨Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. 1 Addition of forces in vertical direction is also zero. Hence, ÃŽ £Fy = 0 ÃŽ ¼R = w sin ÃŽ ¨Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦2 Now by dividing equation 2 by 1 we get, ÃŽ ¼ = tan ÃŽ ¨ 0.08 = tan ÃŽ ¨ ÃŽ ¨ = 4.573ËÅ ¡ Therefore, ÃŽ ¨ = 5ËÅ ¡ To find reaction, From equation 1, R = w cos ÃŽ ¨ R = 1.962 cos (5) R = 1.9543 Factor of safety for design : Design of Cylinder holder : 1 Fig : Cylinder holder for cylinder Air pressure = 5 bar Force by the cylinder = 245 N†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.(Reference solid works ) Hence, Bending moment = Force x Displacement = 245 x 36 = 8820 N-mm Static load through stress, Volume of the holder = 4042 x15 +15 x15 x71 x40 = 67.8 x 10 ³ mm ³ Mass = Density x Volume = 7.78 x10-6 x 67.8 x 10 ³ = 0.5278 Kg Weight (P1) = mass x gravitational acceleration = 0.5278 x 9.81 = 5.1746 N Total weight (P) = Wt. of element + Wt. of cylinder = 5.1746 + 0.59.81 = 10.0746 N Stresses at the joint (ÏÆ') = P à · A = 10.0746 à · 6515 = 10.338 10-3 N/mm ² Extension in the element (ÏÆ'st) = (ÏÆ' à · E) x L = (10.33810-3 à · 2.06x 105) x 35 = 1.756 x 10-6 mm Maximum Impact load acting on the bolt (Pmax) = P {1+√ [(2 h) à · ÏÆ'st ] } = 10.0746 {1+ √ [(2 x 50) à · 1.756 x 10-6]} = 76.06 x 10 ³N Stress produce due to Impact load (ÏÆ'p) =√ [(2 E P h) à · (AL)] = √ [(2x 2.06x 105 x (10.1746+245) x 50) à · (6515 x 35)] = 392.47 N/mm ² 392.47 N/mm ² < 600 N/mm Stress produce due to impact load less than 600 N/mm hence design is safe.

Commercialising from the bottom up: Onions in central Tanzania

Key points: †¢ With minimal assistance and direction, small farmers in central Tanzania have created thriving plots of irrigated onions, marketed in Dar, other parts of Tanzania and in the region. †¢ Lack of formal credit has not prevented many farmers fertilising their crops heavily. Two villages have been able to overcome poor road access. †¢ Informal marketing work well enough: traders make small margins on the onions they buy and sell. †¢ Farmers are reluctant to co-operate in production or marketing; yet the irrigation depends on local water associations and these function. Government and donor roles have largely been keeping the peace, a stable macro-economy and investing in physical infrastructure — the roads, and upgrading the irrigation intakes. Provision of schools and health posts have brought services to the villages. and outcomes. Surveys of 240 households have been complemented by interviews with groups of farmers, elders and key informants. The study Since 2009, researchers from Sokoine University of Agriculture have been studying four villages in central Tanzania — see Map, where onions are grown under irrigation for sale to domestic and regional markets. Two of the villages, Ruaha and Malolo, are located close to the main Dar-Iringa highway, while the other two, Lumuma and Moswero, have much poorer access down long and difficult dirt roads. The studies are designed to understand and explain the role of commercialisation in the villages, the processes involved FAC Research Update 004 www. future-agricultures. org Research Update Box A: How things began: village history Irrigation began at Ruaha-Mbuyuni when Mohamed Nganyali, a fisherman from Iringa, moved to the village. He showed others how to use traditional intakes to raise water level in the river so that it can flow into earth canals. During that time the rainfall was enough for a typical rainfed cropping of field crops such as maize, simsim and sorghum. This intake was upgraded by government in 1963, after which people started to grow onions with seeds from neighbouring villages. As word spread, the village saw incomers seeking irrigated plots. The valley of Malolo was settled by Wasagara, later joined by Wahehe who fled the German war against chief Mkwawa in Iringa in the late C19; attracted by the water. In-migration accelerated after 1961. The irrigation intakes were upgraded in 2002, with 24 km of main canals lined: funds for the work came from Japanese aid. The first settler in Lumuma was Byalumuma who gave his name to the place and its river. Subsequently settlers have come from all over Tanzania In 1975 onion farming was boosted by extension services demonstrating improved techniques. The irrigation intakes were upgraded in 2003, thanks to Danish funding through the Agricultural Sector Development Programme. A recent memorable date is September 2008, when the first mobile phone signals arrived after installation of a local mast. Msowero was first settled by two Wakaguru and two Wasagara families who came for the chance to irrigate. The numbers rose sharply after ujamaa villagisation in 1975 which saw a school built. Its irrigation was upgraded as part of the works for Lumuma in 2003, since they draw on the same stream. Sources: Interviews with elders and other key informants What can be seen in the villages? Commercial production of onions began when farmers, shown how to do it by an ncomer in the 1960s, diverted water from the streams that flow off surrounding hills to irrigate small plots on the flood plain. Box A tells more of the history of the villages. Later farmers soon realised that onions were a profitable crop on the irrigated land and began to specialise in their cultivation. Onions are sold to traders, mainly small-scale operators who lack their own transport, who buy and bag the onions, then hire trucks to take them to Dar and Mbeya, and sometimes beyond to Zanizibar, the Comoros, and south to Malawi and Zambia. Onions are sold on spot deals to whoever arrives and offers a good price. There are plenty of traders and although farmers complain of their lack of bargaining power, the marketing chains appears competitive. Some farmers are making use of the ubiquitous mobile phones to arrange times for traders to come and collect harvests, and to check prices in distant markets. The villages have few alternatives to farming, but the onion trade has given them a living that they could not aspire to from growing food crops — see Figure A, showing returns to crops. Figure A: Returns to land and labour in the four villages, median values in US$ One surprising finding is that many of the farmers who are most engaged in irrigated onions have few or no food crops. Instead they seem to be obtaining most of their maize and other staples from neighbours who grow a surplus on rainfed fields. Surveys in rural Africa usually find farmers preferring to grow their own staples on part of their land, even when they have more profitable cash crops. Research Update 003 www. future-agricultures. org What has made the difference? Most of what has happened has come from the initiative of local farmers, linked to traders who are mainly small operators from other rural areas. It was the farmers who built rustic offtakes, diverted the water, levelled the plots and learned how to grow onions. Almost all the capital invested is local: very few farmers obtain credit, yet they apply 135–175 kg/ha of manufactured fertiliser on their plots. Almost all of them finance this from their retained earnings. At first sight, government has played a minor role. But that would be unfair. Government has ensured a stable economy where farmers can invest, innovate and market their crops. It has also built roads, maintained them. The villages have schools and health posts. When disasters have struck in the past — major droughts and floods, government has provided some relief. In one case, onion producers benefited from extension. Most interesting of all, government guided two donors, Denmark and Japan, to the villages where they funded the modernisation of the intakes. Ideal aid: the donors just helped the farmers improve on what they were already doing, without trying to tell them what to do. The irrigation systems are maintained by the farmers, through water users associations. Marketing might be improved by farmers investing in storage allowing them to extend sales to the months when onion prices rise. Use of text messages to the mobile phones could supply them with regular price updates that would help them make better decisions on selling. There are threats. Population has been rising steadily in the area, as farmers from dryland areas come looking for irrigated plots. Rents correspondingly are rising. With a heavy concentration on onions, there is always the threat of disease or a new pest that could spell disaster. Moreover, the onions are so profitable, one wonders how long before more villages take up the crop and begin to compete in the market. For the two remote villages, there is the prospect that one day the road will be improved: at the moment they are less than 40 km from district headquarters at Kilosa, but cannot drive there directly and instead have to take a circuitous route where it takes five hours to reach the Dar to Dodoma tarmac highway. The road to Kilosa has been in development plans for some years, but it has yet to be built. What are we going to look at next? Current studies are looking at the water associations. These function well enough: they have to, water supply is vital. Yet farmers do not co-operate in production, marketing or almost anything else. The question then is, when people are reluctant to co-operate, how do the water bodies work and what is the secret of their success? Next year it is intended to go back and resurvey the farmers, so that changes can be tracked through time. What might the future hold? Some scope exists to improve onion cultivation through use of certified, improved varieties instead of relying on the sometimes variable quality of local seed. Research Update 003 www. future-agricultures. org This Research Update was written by Khamaldin Mutabazi, Ntengua Mdoe & Steve Wiggins of the Future Agricultures Consortium. The series editor is Beatrice Ouma. Further information about this series of Research Updates at: www. future-agricultures. org The Future Agricultures Consortium aims to encourage critical debate and policy dialogue on the future of agriculture in Africa. The Consortium is a partnership between research-based organisations across Africa and in the UK. Future Agricultures Consortium Secretariat at the University of Sussex, Brighton BN1 9RE UK T +44 (0) 1273 915670 E [email  protected] org Readers are encouraged to quote or reproduce material from Future Agricultures Briefings in their own publications. In return, the Future Agricultures Consortium requests due acknowledgement and a copy of the publication. FAC appreciates the support of the UK Department for International Development (DfID)

Is Religion a Major Cause of Conflict or War between...

Is religion a major cause of war or/and a major cause of the conflict between people? A holy war is justified in the name of â€Å"God†. In Europe, during the 16th and 17th centuries, there were numerous wars caused by religious beliefs. For example, the Spanish Reconquista or the Christian Crusades are instances of religious warfare. The Crusades were wars that began with Christianity against the conquest impelled by the Muslims and their religious expansion. Religion has caused suffering and much immense pain. Friedrich Nietzsche believed Christianity is evil for the world. Bitterness, or ressentiment, is when one has repressed feelings and emotions. Our values play a big role. It reflects the way of life of each individual. Nietzsche, in†¦show more content†¦Nietzsche was most concerned with the â€Å"values† of life. He claims that life itself is about self-overcoming; it is the will to power and it has to be with constant growth. Everything is in a state of change, or flux, in which our survival is in an unrest form. Only through our will to power can we overcome these overwhelming changes and survive. Nietzsche argues that according to the concept of reality there can’t be any fixed claims or position. Arthur Schopenhauer’s philosophical work influenced Nietzsche views. Schopenhauer states that our senses give us representation of the world and that the â€Å"world as will† is the true world. This is where nature is at work (world is at its own will) and we are looking from the outside. Nietzsche argues that the people of his times had a central calamity of â€Å"values†. The belief of â€Å"God† was not sufficient in giving the people the necessary survival of true values. This belief no longer was a source of meaning. This is the primary Nietzsche says that â€Å"God is Dead†. Instead he argues that our fundamental drive of life is â€Å"power†. 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The Old Market Woman Is A Marble Statue - 1270 Words

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On her head, there are vines that create a band around the top of her head used to signify the festival that was going on during that time. The specific detail that is seen on this statue persuades us to want to know the story of this woman. Doing so, the process involves lots of research about the time and art. During the hellenistic period, artists begin to introduce more inner beauty than physical beauty. There is an opportunity to learn more about the structure itself, then settle for what is given and seen. In the Hellenistic period, â€Å"artists became concerned withShow MoreRelatedThe Old Market Wom Relationship Of Realism And Religion1290 Words   |  6 Pagesrelationship of realism and religion in the old market woman The Old Market Woman, is a marble statue that is from the Early Imperial period also known as the Hellenistic period. Artists became obsessed with the idea of childhood and old age, instead of beauty and masculinity. 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It was a small square with a fountain and a beautiful statue from white marble in the center with a shape of a mermaid. This was near the church of the Transfiguration. When we arrived at the creek, the stream that is at the height of Katsios’ Tavern, we stopped to listen to the frogs and we were laughing with theirRead More Cleopatras Beauty Essay3422 Words   |  14 PagesCleopatra beautiful? This is a seemingly straightforward question but there are many characteristics of beauty and all must be considered when applied to Cleopatra. Firstly, what is beauty? Beauty is differe nt for every person and every time period. The old saying that beauty is in the eye of the beholder remains truthful today. It is not only the person that dictates what is beautiful; the time period during which beauty is portrayed must be taken into account as well. The aesthetic ideal of the RenaissanceRead MoreThe Golden Age of Athens3111 Words   |  13 Pagesor generals, who served as both military officers and diplomats. It was through this position that Pericles shaped fifth-century Athens. There were also more than forty public administration officers and more than sixty to police the streets, the markets, to check weights and measures and to carry out arrests and executions. These executions were carried out by use of bo-staff[citation needed]. The Assembly of the People The  Assembly  (in Greek,  Ã¡ ¼ ÃŽ ºÃŽ ºÃŽ »ÃŽ ·ÃÆ'ÃŽ ¯ÃŽ ±, that is to say, an assembly by summons)Read MoreReclining Pan in the St. Louis Art Museum2701 Words   |  11 PagesReclining Pan in the St. Louis Art Museum Reclining Pan (St. Louis Art Museum, 138:1947) also known as Drunken Satyr, a marble sculpture modeled by Giovanni Angelo Montorsoli in early 16th century, is portraying Pan, the god of the woods, fields, and flocks in the reclining position. The sculpture was owned by the powerful Barberini Family in Rome, then purchase by St. Louis Art Museum in1947.1 Reclining Pan at the St. Louis Art Museum under discussion presents a commanding image of theRead MoreA Temporary Matter. Essay9411 Words   |  38 Pagesfor cash and got drunk in the middle of the day. She tells him that she once let him speak to the chairman of his department with food on his chin. On the fourth night, he admits he kept a picture of a woman torn out of a magazine in his wallet while Shoba was pregnant. The desire for the unknown woman was the closest he ever came to infidelity. Shoba tells him she never liked the only poem he had ever published. Shukumar and Shoba are able to be intimate in the dark. On the third night, they kissRead MoreCulture of India9032 Words   |  37 Pagesdance, music, architecture, food, and customs differ from place to place within the country. Its culture often labeled as an amalgamation of these diverse sub-cultures is spread all over the Indian subcontinent and traditions that are several millennia old.[1] Several elements of Indias diverse culture, such as Indian religions, yoga, and Indian cuisine, have had a profound impact across the world. Pakistan and North Indian States follow the medieval Indo-Persian culture, exemplified by its musicalRead MoreLangston Hughes Research Paper25309 Words   |  102 PagesIn 1919, when Langston Hughes was seventeen years old, he spent the summer with his father, Jim Hughes, in Toluca, Mexico. Langston had not seen his father since he was a small child, and he was excited about making the trip. However, during this visit, no affectionate bond would develop between Langston and Jim. Jim Hughes was a cold, difficult man, who was driven by ambition to make money and achieve respect. He had moved to Mexico to avoid segregation and racial injustice in the United States