Fire station Essay Example for Free

Fire station Essay My name is Austin Pea; I currently reside at Fire Station 49. I am part of a resident program where I am a fully qualified Firefighter/EMT, and able to respond to calls as they come into our station. I have been a resident here for 3 months; so far it has been great to serve the community which I have grown up in. I have focused this paper on the disaster preparedness of my Fire House, and if this household is as prepared as it should be. From first glance you would think a Fire Station would be the best place to be. After doing the research though, it turns out it would not be the best place to have a fire. I have included maps of the local area and pictures of my Fire Station, inside and out. This paper covers, in depth, the Pacific North West climate, and possible Natural Disasters that could affect this region. This paper includes average rainfalls, temperatures, and winds in the Spokane County region. My name is Austin Pea; I currently reside at Fire Station 49. I am part of a resident program where I am a fully qualified Firefighter/EMT, and able to respond to calls as they come into our station. I have been a resident here for 3 months; so far it has been great to serve the community which I have grown up in. I have focused this paper on the disaster preparedness of my Fire House, and if this household is as prepared as it should be. From first glance you would think a Fire Station would be the best place to be. After doing the research though, it turns out it would not be the best place to have a fire. I have included maps of the local area and pictures of my Fire Station, inside and out. This paper covers, in depth, the Pacific North West climate, and possible Natural Disasters that could affect this region. This paper includes average rainfalls, temperatures, and winds in the Spokane County region. My name is Austin Pea; I currently reside at Fire Station 49. I am part of a resident program where I am a fully qualified Firefighter/EMT, and able to respond to calls as they come into our station. I have been a resident here for 3 months; so far it has been great to serve the community which I have grown up in. I have focused this paper on the disaster preparedness of my Fire House, and if this household is as prepared as it should be. From first glance you would think a Fire Station would be the best place to be. After doing the research though, it turns out it would not be the best place to have a fire. I have included maps of the local area and pictures of my Fire Station, inside and out. This paper covers, in depth, the Pacific North West climate, and possible Natural Disasters that could affect this region. This paper includes average rainfalls, temperatures, and winds in the Spokane County region. My name is Austin Pea; I currently reside at Fire Station 49. I am part of a resident program where I am a fully qualified Firefighter/EMT, and able to respond to calls as they come into our station. I have been a resident here for 3 months; so far it has been great to serve the community which I have grown up in. I have focused this paper on the disaster preparedness of my Fire House, and if this household is as prepared as it should be. From first glance you would think a Fire Station would be the best place to be. After doing the research though, it turns out it would not be the best place to have a fire. I have included maps of the local area and pictures of my Fire Station, inside and out. This paper covers, in depth, the Pacific North West climate, and possible Natural Disasters that could affect this region. This paper includes average rainfalls, temperatures, and winds in the Spokane County region.

Gun Control Essay Example for Free

Gun Control Essay Abstract Some reasons why colleges should look at the laws that they put in place and try to change them. Students should have the right to conceal weapons on college campuses. The guns provide the protection that may be necessary in certain situations. Like the Virginia Tech Shooting, many people could have been saved if only one person had a gun. Having a gun gives a sense of safety to many people on the campus, especially for women with a greater risk of intruders and rapists. For these women, knowing that they have a way to defend themselves can set their minds to ease. Though some believe that the allowance of guns would increase violence on campus, no other college that has allowed concealed firearms has had an issue. Another concerning issue would be that having guns on campus would be easier for students to commit suicide; there are just some things in life that authorities cannot control, and that is one of them. The right to have a concealed weapon on campus should be conveyed freely. Position Paper Legalize Concealed Weapons on College Campuses Liberty senior, Craig Storrs, says, â€Å"It makes me feel secure knowing I would be able to defend myself if something does happen, like Virginia Tech or if I get stopped on the street for a mugging or something like that† (Barry, 2011). The topic of legalizing concealed weapons on college campuses has been argued for many years. Some colleges have legalized concealed weapons on campus and have not had problems, but many will not even think about legalizing concealed weapons. Carrying a concealed weapon at the age of 21 is a right including a college campus, because it offers protection and safety to students (Students for concealed, 2008). Background of Concealed Weapons on College Campuses Since the Virginia Tech shooting, many colleges have changed their on-campus laws concerning firearms. In eight states, the legislation is considering if students and staff would be able to carry a concealed weapon into college buildings. Many officials did not want to have another repeat the Virginia Tech shooting. Two years before the Virginia Tech shooting, the lawmakers of Texas rejected a bill to allow concealed weapons onto college campuses. Since then, the bill has come back with better arguments for the right to have a concealed weapon on college campuses. Corey Zipper, a twenty-one year-old psychology major, went to the state capitol to talk to the officials to pass the bill. Corey Zipper stated, â€Å"We get the mature thing a lot – that college students aren’t mature enough. And the alcohol thing – that we’re all just boozed up all the time† (Burnett, 2011). He also states that the law states that â€Å"a person much be 21 years old, have a clean record and no psychiatric disorders, and take a 10-hour instruction course that includes time at a firing range† (Burnett, 2011). In 2009 Texas passed the bill to legalize having a concealed weapon on college campus (Burnett, 2011). It Gives Protection Allowing students to carry a gun could save their lives. Life can be unpredictable, so when something happens people should be prepared. If by being prepared means they need to carry a gun, then why would the state want to take that right from someone? A person has the right to protect his/herself and others, and a responsible firearm owner would do such. Many lives could be saved by the simple action of allowing concealed weapons on college campuses (Concealed Guns, 2011). Background of Virginia Tech Shooting On April 16, 2007, Seung-Hui Cho, student at Virginia Tech, began his shooting around 7:15 A.M. in a co-ed dormitory. He first killed Emily Hilsher and Ryan Clark. The Virginia Tech Police Chief said, â€Å"We secured the building, we secured the crime scene† (Caruso, n.d.). The authorities did not put the college on lock down and had classes as schedualed. Seung-Hui Cho did not leave the campus; around 9:15 A.M. he started to kill again. He went into the engineering and science building and chained the doors so no one could escape. He then went into classroom after classroom; he killed 25 more students and five faculty members. Twenty-nine people were wounded. In the end Cho also took his life (Caruso, n.d.). It was reported that nineteen of the thirty-two victims that were killed were over the age of 21. The age of 21 is the legal age for the right to conceal a weapon in Virginia. If these students would have been able to carry a firearm onto campus, then perhaps these lives could have been saved. Instead of thirty-three lives taken that day, there should have been one. Innocent people would not have died (Students for concealed, 2008). Concealed Weapons Should not Depend on Location It is stated in the Constitution that a person has the right to bear arms at the age of 21. This law does not give specific places that are prohibited. People should not have to put their concealed weapon away because of where they are (The Right to Keep and Bear Arms, 1982). Public Places People can Carry Weapons Though colleges are small, some places that allow concealed weapons are smaller. When a person goes to the movies, they are allowed to carry a concealed weapon. No one would ever know because the weapon is concealed. Other places would include a shopping mall. When people are shopping, the last thing they are thinking is that the people next to them might have a gun on them (Students for concealed, 2008). Make College Students Feel Safer The right to conceal a weapon could put some students at ease. Knowing that they have a way to save themselves in dangerous situations may make the students more relaxed. If a student comes across a dangerous situation, then they are prepared. These students do not have to worry about what to do (Marin, 2012). College Intruders and Rapists It is easy for intruders to get into dorms. In New York, two men got into a building by sneaking in behind another guy after he swiped his card. When the college police were called they came and took the men without calling the cops. If this were to happen again, these men would be taken to the authorities. Knowing that it is easy for strange people to get into housing, it not be a good idea to rob students the right to have a concealed weapon. This would give some students that okay to live life and other the need of protection that they might not be able to find anywhere else (Rearick, 2011). One in four women have the chance of being raped in college. Guns could help defend so many different women. They could have gotten out of the situation if they just had a way of defense. Sometimes women are physically too weak to run from situations like that and the allowance of a gun would provide that opportunity to them (College Crime Today, n.d.). Counterargument: Guns on Campus Would Promote Violence . â€Å"Some professors might be afraid to issue bad grades if they know that students could be carrying guns† (Students for concealed, 2008). Some people believe that allowing student to carry firearms would push them to be violent. If the students are allowed to carry firearms, then they will not be afraid to use them. If there was an argument with another student, then these students would be tempted to use the gun to scare or even harm the other student (Students for concealed, 2008). Logical Response: Guns on Campus Would not Promote Violence There has been over thirty colleges campuses that have allowed concealed weapons on their campuses. These campuses have had no issues with gun violence, and there has not been a gun theft or accident in all these years. This shows that it is a possibility to carry conceal weapons and still get a great education with no distraction with no violence. Studies show, â€Å"concealed handgun license holders are five times less likely than non-license holders to commit violent crimes† (Students for concealed, 2008). Counterargument: Guns on Campus Would Encourage Suicide Some believe that allowing students to obtain firearms would increase the likelihood suicide. They would have all the resources they need now that they are able to carry concealed firearms. This would make it easier for these students to commit suicide without anyone knowing until after the fact. This would then increase the suicide numbers dramatically. Allowing a student to carry a firearm that could potentially use to kill themselves is not the way to help (Students for concealed, 2008). Logical Response: Guns on Campus Would not Encourage Suicide According to detectives, â€Å"Studies show that 90% of suicides are committed in the home† (Students for concealed, 2008). Since the legal age to own a concealed weapon is 21, most students at this age live off campus. This would not affect the numbers as much as the colleges think it would. If people really wanted to commit suicide, then nothing would stand in their way. Allowing them to conceal a gun will just give them an easier way out (Students for concealed, 2008). Conclusion During the Virginia Tech Shooting many lives could have been saved. Students could also feel safer knowing that they have something there to protect themselves and others if needed. Though students could turn to violence many are very responsible to be carrying this gun in the first place. They just cannot get a gun; they have to go through the process. Another concern would be suicide, but since most of the students live off campus anyway nothing would stop that. It would be a lost cause to put a ban on concealed weapons when there is nothing to prevent suicide in the first place. Once the right training classes are taken, it should not be a problem for a person to be able to carry his/her gun that he/she worked hard to get and paid for. The right to have a concealed weapon on campus should be expressed freely. References Barry, L. (2011). Liberty university oks concealed guns on campus. Retrieved from http://www2.newsadvance.com/news/2011/nov/16/5/liberty-university-oks-concealed-guns-campus-ar-1463719/. Burnett, J. (2011). Texas Lawmakers aim for guns on college campuses. Retreieved from http://www.npr.org/2011/02/04/133466058/texas-lawmakers-aim-for-guns-on-college-campuses. Caruso, K. (n.d.). What Happened: The Virginia Tech Massacure. Retrieved from http://www.virginiatechmassacre.com/what-happened-virginia-tech-massacre.html. College Crime Today. (n.d.) Retrieved from http://www.womens-self-defense-instruction-online.com/college-crime.html. Concealed guns. (2011). Retrieved from http://concealedguns.procon.org/. Frantz, A. (2011). Texas considering concealed handguns on campus. Retrieved from http://news.blogs.cnn.com/2011/02/22/texas-weighing-concealed-handguns-on-campus/. Marin, J. (2012). Guns on college campuses. Retrieved from http://schoolsofthought.blogs.cnn.com/2012/01/03/guns-on-college -campuses/. Rearick, J. (2011). Intruders spark safety concerns. Retrieved from http://www.miscellanynews.com/2.1576/intruders-spark-safety-concerns-1.2660011#.TxkPxJit-fQ. Students for concealed carry on campus. (2008). Retrieved

Uses Of Starter Motors And Their History Engineering Essay

Uses Of Starter Motors And Their History Engineering Essay Motor Starters are switches specially designed for starting motors. These switches are designed to control the flow of current. There are basically two types of motor starters, Manual Starters and Magnetic Starters. Uses of STARTER In a Motor : 1: To give starting resistance to motor. 2:Starter is used to safe the motor winding from the high starting current. 3: Starter is used in a motor to control the limit of high starting current.As the motor starts(in case of DC motor) high current occurs which is controlled by use of high resistance slowly cut out of the circuit. History Both Otto cycle and Diesel cycle internal-combustion engines require the pistons which is used to convert pressure into motion. Originally, a hand crank(handle) was used to start engines, but it was difficult, and dangerous to start an engine. Even though cranks had an overrun mechanism, when the engine started, the crank could begin to spin along with the crankshaft and it might strike the person starting the engine. Care has to be taken to prevent the spark from backfiring. In short we can say that there is a lot of risk while starting the engine with a a crank.Moreover, increasingly larger engines with higher compression ratios made hand cranking a more physically demanding endeavour. While there was a need of starter, as in 1899, Clyde J. Coleman applied for U.S. Patent 745,157 for an electric automobile self-starter inventing one that worked successfully in most conditions did not occur until 1911 when Charles F. Kettering of Dayton Engineering Laboratories Company (DELCO) invented and filed for U.S. Patent 1,150,523 for the first useful electric starter. (Kettering had replaced the hand crank on NCRs cash registers with an electric motor five years earlier.) One aspect of the invention lay in the realization that a relatively small motor, driven with higher voltage and current than would be feasible for continuous operation, could deliver enough power to crank the engine for starting. At the voltage and current levels required, such a motor would burn out in a few minutes of continuous operation, but not during the few seconds needed to start the engine. The starters were first installed by Cadillac on production models in 1912. The Model T relied on hand cran ks until 1919; by 1920 most manufacturers included self-starters.The electric starter ensured that anyone could easily start and run an internal combustion engine car, and this made it the design of choice for car buyers from that day forward. Details about the Starters used-> Following starters used to operate motor starter Electric starter Gear reduction starter Pneumatic starter The Principal at which motor starter is worked Electric starter used in motor starter Electric starter Main Housing Overrunning clutch Armature Field coils Brushes Solenoid What is motor starter? A starter motor is a high-torque electric motor for turning the gear on the engine flywheel. The modern starter motor is either a permanent-magnet or a series-parallel wound direct current electric motor with a solenoid switch (similar to a relay) mounted on it. When current from the starting battery is applied to the solenoid, usually through a key-operated switch, it pushes out the drive pinion on the starter driveshaft and meshes the pinion with the ring gear on the flywheel of the engine. Before the advent of key-driven starters, most electric starters were actuated by foot-pressing a pedestal located on the floor, generally above the accelerator pedal. Solenoid The solenoid also closes high-current contacts for the starter motor, which begins to turn. Once the engine starts, the key-operated switch is opened, a spring in the solenoid assembly pulls the pinion gear away from the ring gear, and the starter motor stops. The starters pinion is clutched to its driveshaft through an overrunning sprag clutch which permits the pinion to transmit drive in only one direction. In this manner, drive is transmitted through the pinion to the flywheel ring gear, but if the pinion remains engaged (as for example because the operator fails to release the key as soon as the engine starts), the pinion will spin independently of its driveshaft. This prevents the engine driving the starter, for such backdrive would cause the starter to spin so fast as to fly apart. However, this sprag clutch arrangement would preclude the use of the starter as a generator if employed in hybrid scheme mentioned above; unless modifications are made. Also, a standard starter motor is only designed for intermittent use which would preclude its use as a generator. Overrunning clutch This overrunning-clutch pinion arrangement was phased into use beginning in the early 1960s; before that time, a Bendix drive was used. The Bendix system places the starter drive pinion on a helically-cut driveshaft. When the starter motor begins turning, the inertia of the drive pinion assembly causes it to ride forward on the helix and thus engage with the ring gear. When the engine starts, backdrive from the ring gear causes the drive pinion to exceed the rotative speed of the starter, at which point the drive pinion is forced back down the helical shaft and thus out of mesh with the ring gear. An intermediate development between the Bendix drive developed in the 1930s and the overrunning-clutch designs introduced in the 1960s was the Bendix Folo-Thru drive. The standard Bendix drive would disengage from the ring gear as soon as the engine fired, even if it did not continue to run. The Folo-Thru drive contains a latching mechanism and a set of flyweights in the body of the drive unit. When the starter motor begins turning and the drive unit is forced forward on the helical shaft by inertia, it is latched into the engaged position. Only once the drive unit is spun at a speed higher than that attained by the starter motor itself (i.e., it is backdriven by the running engine) will the flyweights pull radially outward, releasing the latch and permitting the overdriven drive unit to be spun out of engagement. In this manner, unwanted starter disengagement is avoided before a successful engine start. Starter used in motor starter : Gear-reduction starters Chrysler Corporation contributed materially to the modern development of the starter motor. In 1962, Chrysler introduced a starter incorporating a geartrain between the motor and the driveshaft. Rolls Royce had introduced a conceptually similar starter in 1946, but Chryslers was the first volume-production unit. The motor shaft has integrally-cut gear teeth forming a drive gear which mesh with a larger adjacent driven gear to provide a gear reduction ratio of 3.75:1. This permits the use of a higher-speed, lower-current, lighter and more compact motor assembly while increasing cranking torque. Variants of this starter design were used on most vehicles produced by Chrysler Corporation from 1962 through 1987. The Chrysler starter made a unique, readily identifiable sound when cranking the engine. This starter formed the design basis for the offset gear reduction starters now employed by about half the vehicles on the road, and the conceptual basis for virtually all of them. Many Japanese automakers phased in gear reduction starters in the 1970s and 1980s. Light aircraft engines also made extensive use of this kind of starter, because its light weight offered an advantage. Those starters not employing offset geartrains like the Chrysler unit generally employ planetary epicyclic geartrains instead. Direct-drive starters are almost entirely obsolete owing to their larger size, heavier weight and higher current requirements. Ford also issued a nonstandard starter, a direct-drive movable pole shoe design that provided cost reduction rather than electrical or mechanical benefits. This type of starter eliminated the solenoid, replacing it with a movable pole shoe and a separate starter relay. The Ford starter operated as follows: The operator closed the key-operated starting switch. A small electric current flowed through the starter relay coil, closing the contacts and sending a large current to the starter motor assembly. One of the pole shoes, hinged at the front, linked to the starter drive, and spring-loaded away from its normal operating position, swung into position. This moved a pinion gear to engage the flywheel ring gear, and simultaneously closed a pair of heavy-duty contacts supplying current to the starter motor winding. The starter motor cranked the engine until it started. An overrunning clutch in the pinion gear uncoupled the gear from the ring gear. The operator released the key-operated starting switch, cutting power to the starter motor assembly. A spring retracted the pole shoe, and with it, the pinion gear. FEATURES / BENEFITS à ¢Ã¢â€š ¬Ã‚ ¢ It is Compact . à ¢Ã¢â€š ¬Ã‚ ¢ It has high torque. à ¢Ã¢â€š ¬Ã‚ ¢ It has high durability. à ¢Ã¢â€š ¬Ã‚ ¢ It has self-contained clutch shaft. Electric starter The modern starter motor is either a permanent-magnet or a series-parallel wound direct current electric motor with a solenoid switch (similar to a relay) mounted on it. When current from the starting battery is applied to the solenoid, usually through a key-operated switch, it pushes out the drive pinion on the starter driveshaft and meshes the pinion with the ring gear on the flywheel of the engine. Before the advent of key-driven starters, most electric starters were actuated by foot-pressing a pedestal located on the floor, generally above the accelerator pedal. The solenoid also closes high-current contacts for the starter motor, which begins to turn. Once the engine starts, the key-operated switch is opened, a spring in the solenoid assembly pulls the pinion gear away from the ring gear, and the starter motor stops. The starters pinion is clutched to its driveshaft through an overrunning sprag clutch which permits the pinion to transmit drive in only one direction. In this manner, drive is transmitted through the pinion to the flywheel ring gear, but if the pinion remains engaged (as for example because the operator fails to release the key as soon as the engine starts), the pinion will spin independently of its driveshaft. This prevents the engine driving the starter, for such backdrive would cause the starter to spin so fast as to fly apart. However, this sprag clutch arrangement would preclude the use of the starter as a generator if employed in hybrid scheme mentioned above; unless modifications are made. Also, a standard starter motor is only designed for intermittent use which would preclude its use as a generator. This overrunning-clutch pinion arrangement was phased into use beginning in the early 1960s; before that time, a Bendix drive was used. The Bendix system places the starter drive pinion on a helically-cut driveshaft. When the starter motor begins turning, the inertia of the drive pinion assembly causes it to ride forward on the helix and thus engage with the ring gear. When the engine starts, backdrive from the ring gear causes the drive pinion to exceed the rotative speed of the starter, at which point the drive pinion is forced back down the helical shaft and thus out of mesh with the ring gear. An intermediate development between the Bendix drive developed in the 1930s and the overrunning-clutch designs introduced in the 1960s was the Bendix Folo-Thru drive. The standard Bendix drive would disengage from the ring gear as soon as the engine fired, even if it did not continue to run. The Folo-Thru drive contains a latching mechanism and a set of flyweights in the body of the drive unit. When the starter motor begins turning and the drive unit is forced forward on the helical shaft by inertia, it is latched into the engaged position. Only once the drive unit is spun at a speed higher than that attained by the starter motor itself (i.e., it is backdriven by the running engine) will the flyweights pull radially outward, releasing the latch and permitting the overdriven drive unit to be spun out of engagement. In this manner, unwanted starter disengagement is avoided before a successful engine start. The modern starter motor is a series-wound direct current electric motor with a solenoid switch (similar to a relay) mounted on it. When low-current power from the starting battery is applied to the solenoid (the thin, grey wire in the image above), usually through a key-operated switch, it pushes out a small pinion gear on the starter motors shaft and meshes it with the ring gear on the flywheel of the engine. The solenoid also closes high-current contacts (powered through the thick red cable in the image) for the starter motor and it starts to run. Once the engine starts, the key-operated switch is opened, a spring in the solenoid assembly pulls the pinion gear away from the ring gear, and the starter motor stops. Modern starter motors have a bendix   a gear and integral freewheel, or overrunning clutch, that enables the flywheel to automatically disengage the pinion gear from the flywheel when the engine starts. Chrysler and Ford both contributed to the starter market, with two types that were very different to those used on vehicles today. Chrysler manufactured a gear reduction starter employing a small gear to drive a larger gear attached to the starters pinion gear shaft. This allowed lower current to be drawn from the battery to run the starter, and still had the initial torque needed to turn the flywheel approximately at 200 rpm. This starter is also smaller and integrates the starter solenoid in the starter case, instead of having it mounted externally. Since this design weighs less, it has also been adapted to some light aircraft engines, where minimizing weight is very important. Fords version was slightly more complicated. The engineers at Ford Motor Company used a positive engagement style starter. This type of starter eliminated the solenoid, replacing it with a moveable armature and a separate starter relay. An armature is a part made of ferromagnetic metal that is magnetized by a coil of copper ribbon wound around it, creating an electromagnet. The Ford starter operated as follows: The operator closed the key-operated starting switch. A small electric current flowed through the starter relay coil, closing the contacts and sending a large current to the starter motor assembly. The armature moved a pinion gear to engage the flywheel ring gear, and simultaneously closed a pair of heavy-duty contacts supplying current to the starter motor winding. The starter motor cranked the engine until it started. An overrunning clutch in the pinion gear uncoupled the gear from the ring gear. The operator released the key-operated starting switch, cutting power to the starter motor assembly. A spring retracted the armature, and with it, the pinion gear. Current Ford starter designs incorporate the starter solenoid into the starter motor assembly, instead of mounting it on the firewall or on a fender. Starter motor A starter is an electric motor needed to turn over the engine to start it. A starter consists of the very powerful DC electric motor and starter solenoid that is attached to the motor (see the picture). A starter motor requires very high current to crank the engine, thats why its connected to the battery with large cables (see lower diagram). The negative (ground) cable connects -battery terminal to the engine block close to the starter. The positive cable connects +battery terminal to the starter solenoid. The starter solenoid works as an electric switch when actuated, it closes the circuit and connects the starter motor to the battery. At the same time, it pushes the starter gear forward to mesh with the engines flywheel. How the starting system works: When you turn the ignition key to the Startposition, the battery voltage goes through the starter control circuit and activates the starter solenoid, which in turn energizes the starter motor. The starter motor cranks the engine. A starter can only be operated when the automatic transmission shifter is in Parkor Neutralposition or if the car has a manual transmission, when the clutch pedal is depressed. To accomplish this, there is a Neutral safety switchinstalled at the automatic transmission, (or at the clutch pedal). When the automatic transmission is not in Parkor Neutral(or when the clutch pedal is not depressed), the neutral safety switch is open and the starter relay disconnects the starter control circuit. Simplified diagram of typical starting system Pneumatic Starter A Pneaumatic motor is a machine which converts in the form of compressed air into mechanical work. It converts it either in linear or rotary motion. Linear motion can come from piston actuator,while rotary motion is supplied by a piston air motor. These motors are very successful in hand-held tool industry. Classification Linear In order to achieve linear motion from compressed air, a system of pistons is most commonly used.   The compressed air is pumped into an air tight chamber that houses the shaft of the piston.   Also inside this chamber a spring is coiled around the shaft of the piston in order to hold the chamber completely open when air is not being pumped into the chamber.   As air is pumped into the chamber the force on the piston shaft begins to overcome the force being exerted on the spring. As more air is pumped into the chamber, the pressure increases and the piston begins to move down the chamber. When it reaches its maximum length the air pressure is released from the chamber and the spring completes the cycle by closing off the chamber to return to its original position.   Piston motors are the most commonly used in hydraulic systems. Essentially, piston motors are the same as hydraulic pumps except they are used to convert hydraulic energy into mechanical energy.    Piston motors are often used in series of two, three, four, five, or six cylinders that are enclosed in a housing.   This allows for more power to be delivered by the pistons because several motors are in sync with each other at certain times of their cycle Rotary Another type of pneumatic motor, known as a rotary vane motor, uses air to produce rotational motion to a shaft.   The rotating element is a slotted rotor which is mounted on a drive shaft. Each slot of the rotor is fitted with a freely sliding rectangular vane.[3] The vanes are extended to the housing walls using springs, cam action, or air pressure, depending on the motor design. Air is pumped through the motor input which pushes on the vanes creating the rotational motion of the central shaft. Rotation speeds can vary between 100 and 25,000 rpm depending on several factors which including the amount of air pressure at the motor inlet and the diameter of the housing.[1] Rotary motion vane type air motors are used to start large industrial diesel or natural gas engines.   Stored energy in the form of compressed air, nitrogen or natural gas enters the sealed motor chamber and exerts pressure against the vanes of a rotor.   Much like a windmill, this causes the rotor to turn at high speed.   Because the engine flywheel requires a great deal of torque to start the engine, reduction gears are used. Reduction gears to create high torque levels with the lower amounts of energy input. These reduction gears allow for sufficient torque to be generated by the engine flywheel while it is engaged by the pinion gear of the air motor or air starter. Application A widespread application of small pneumatic motors is in hand-held tools, power ratchet wrenches, drills, sanders, grinders, cutters, and so on. Though overall energy efficiency of pneumatics tools is low and they require access to a compressed-air source, there are several advantages over electric tools. They offer greater power density (a smaller pneumatic motor can provide the same amount of power as a larger electric motor), do not require an axillary speed controller (adding to its compactness), generate less heat, and can be used in more volatile atmospheres as they do not require electric power.Some gas turbine engines and Diesel engines, particularly on trucks, use a pneumatic self-starter. The system consists of a geared turbine, an air compressor and a pressure tank. Compressed air released from the tank is used to spin the turbine, and through a set of reduction gears, engages the ring gear on the flywheel, much like an electric starter. The engine, once running, powers th e compressor to recharge the tank. On larger diesel generators found in large shore installations and especially on ships, a pneumatic starting gear is used. The air motor is normally powered by compressed air at pressures of 10-30 bar. The air motor is made up of a center drum about the size of a soup can with four or more slots cut into it to allow for the vanes to be placed radially on the drum to form chambers around the drum. The drum is offset inside a round casing so that the inlet air for starting is admitted at the area where the drum and vanes form a small chamber compared to the others. The compressed air can only expand by rotating the drum which allows the small chamber to become larger and puts another one of the cambers in the air inlet. The air motor spins much too fast to be used directly on the flywheel of the engine, instead a large gearing reduction such as a planetary gear is used to lower the output speed. A Bendix gear is used to engage the flywheel. Some smaller diesel engines such as ones found on tugboats and lifeboats use hydraulic start motors in which the air motor is replaced with a hydraulic motor. While running, the engine shouldnt be shut down unless the hydraulic accumulators for the starting motor are recharged. Otherwise there is a manual hand pump to slowly pump up the accumulators. Since large trucks typically use air brakes, the system does double duty, supplying compressed air to the brake system. Pneumatic starters have the advantages of delivering high torque, mechanical simplicity and reliability. They eliminate the need for oversized, heavy storage batteries in prime mover electrical systems. BIBLOGRAPHY WWW.GOOGLE.COM WWW.WIKIPEDIA.COM WWW.PHYSICS.ORG

John Miltons Sonnet 16 Essay -- John Milton Sonnet 16 Essays

John Milton's Sonnet 16 In his sonnets, John Milton tackles a number of subjects which he addresses at considerably greater length in his other poetry and prose. These subjects range from religious to political, and rarely is any one piece of writing limited to one or the other of those fields. While his Sonnet 16 begins with a challenge to familiar biblical passages, Milton ultimately uses it to offer a critique of the nearly ubiquitous comparison between the king and God. The sonnet features two motifs that run throughout the first seven lines. Both are biblical, and both are introduced in the first line. The one that seems to be the most significant is the light and dark imagery. In the first line, it sounds like a reference to Milton’s blindness (this is more or less plausible depending on which date of publication you accept). As this language continues to crop up, it appears that Milton’s darkness has a larger importance. In the second line, he refers to the world as dark, and in line seven, he uses the lack of light to pose a frustrated question to God. By using this vocabulary to describe his fears, Milton creates a connection with two passages from the Bible that use the same language to explain the will of God and the way of the world. In Matthew 25: 1-13, a brightly shining lantern symbolizes a person’s preparedness for God’s coming, and in John 9:4, Christ refers to the limited time he (and every man ) has to do God’s work on earth before â€Å"the night cometh, when no man can work† (King James Bible). Milton engages with these passages, so that when he reaches the height of his dilemma, â€Å"Doth God exact day-labour, light denied,/I fondly ask† he is issuing a direct challenge to a statement made b... ... God has a tireless band of angels as well as his followers among men who have learned to set aside all else and worship him. In this sonnet, Milton manages to turn his personal complaint into not one but two of his favorite things: praise of God, and intense criticism of the king. By focusing on the parable of the talents and its ties to both the worldly and the spiritual, Milton calls God and King into relief. He is then able to use God and His eternal, abiding goodness to highlight the King’s small-minded, self-centered tyranny. This direct comparison gives readers a sense of Milton’s belief that earthly authority is corrupt, and should never be a part of religion. God and the King are so vastly far apart that to bring them together, whether in poetry or in a church hierarchy, is offensive to God and can only bring out the weaknesses of the King.

The Common Cold :: essays research papers

The common cold has been plaguing humankind since the beginning of human existence. Even in these advanced times, there is no vaccine or cure. There are many symptoms that accompany the common cold. Some of these infamous symptoms are a runny nose, caused by inflammation of the nasal tissues, resulting in over production of mucus to trap the virus, and coughing. there are two different kinds or types of coughs that are common with colds. The first, is the less common dry hacking cough, these kinds are more likely to keep you up at night and just plainly annoy you than do any thing else. The other more common type of cough is the kind whose purpose is to expel mucus and or phlegm. These help to combat the cold by helping to expel the mucus that has the virus trapped in it. Other symptoms include a slight tingle or tickle in the back of the throat that usually turns into a sore throat and sneezing. Both of these symptoms are was for your body to help expel phlegm or mucus from the body. Another symptom is swelling of the face and or neck usually accompanied by pain around the eyes, nose, and forehead. This pain and swelling is caused by the introduction of the virus into your upper respiratory tract, therefore causing mucus building up in your nasal passages and then in your sinuses causing them both to become impacted. Many people complain of hoarseness, aches and pains in their joints, fever of about 101 degrees, and general aches and pains all over their bodies (Anthanasoid). There are at least two hundred different kinds of viruses that are known to cause what is known as the common cold, and an unknown number of undiscovered causes (Nourse 56). The virus who is usually responsible for a cold is called a rhinovirus, and it accounts for around thirty to fifty percent of all colds that afflict the adult part of the human population. The virus that is secondly responsible for most common colds, is called a coronavirus, and it is only different form a rhinovirus by a margin of few select proteins in it's molecular structure. The rhinovirus is so small that it can only be measured in milimicrons, one milimicron is about 1/25,000,000 of an inch, that means that about five hundred rhioviruses can fit on the point of a pin. That fact makes the rhinovirus and the coronavirus categorized in the medium territory. The virus cannot reproduce by itself. In fact scientists cannot even decide whether to classify it as an animal or a plant, because it is so primitive. To reproduce, the virus must first latch onto a nearby cell and inject it's genetic makeup into the

Womens Roles in Ancient Times Essays -- Females Sociology Sociologica

Women's Roles in Ancient Times For years, people have said that since the beginning of civilization our society has been patriarchal. This assumption is wrong. Archeological evidence proves that in the beginnings, the cultures were female-centered, with a creator goddess. Women's roles were valued as more important than men's role specially because they could give birth. Although this is true, no evidence suggests that these cultures had a matriarchal society. In fact, the evidence found supports the idea of a society where men and women worked side by side sharing the labor, with different roles or tasks, but all equally important. This idea declined over time until we got to the point where women were treated as slaves, and societies were completely male-centered. To prove that women did actually have a very important role in the beginnings of times, we will look at evidence from three archeological sites: Paleolithic Europe, the Neolithic "Old Europe" and the Neolithic Catal Huyuk. First, Paleolithic period in Europe which contains information for the oldest civilization we know up too now, covers the years 40,000 to 10,000 BCE. In this period, people saw the universe as an all giving mother, a very powerful force that gave life. The birth giving process, was looked upon as miraculous in this times, therefore women were venerated for them posses that ability. Evidence to support this theory, can be found in the paintings on the caves discovered in this site. Fist, in these paintings female figures or feminine symbols where always placed in the center, surrounded by the masculine symbols. Also whenever animals' drawings were found in those painting, they were often drawn with big bellies implying pregnancy. E... ...a society where women took on not only an important role, but perhaps the most important role that of the creator of life. However, as society developed and cultures were born the world changed, and we came upon what we have today. A world, where women not only do not have the important role it had before, but had to fight to get the minimal human rights that any human is entitled to. After generations, today we are able to support the importance of the role of women in the creation of many of the principal societies have been built upon such as agriculture and art. In spite of the many changes through the generations, there is one irrefutable fact that will always ensure the place of women in history, we will always be the giver-of-life. Even if that role has been cast down from that of a Goddess to that of an everyday woman, the miracle of it still remains intact.

Curleys Wife: Miss Dynamite or lonely victim? Essay

Throughout the book Steinbeck changes Curley’s wife in different ways. He makes the reader feel hatred, sympathy, annoyance and love for Curley’s wife. These different interpretations create an unusual feel for this character. It is difficult to pinpoint one particular character that she is, as our opinions change regularly in the book. Since the beginning of the book Curley’s wife has come across very confident, lustful and bold. She puts on a confident, troubling image to start but as the book progresses she slowly reveals the lonely, apprehensive woman she really is. This image gets her in to a lot of trouble and makes her come across bad. She isn’t liked by the farm-workers, and they treat her very badly. At the start of the book George refers to her as ‘Jesus, what a tramp’ and ‘†¦ no piece of jail bait worse than her,’ these comments show how she comes across to the new characters and how little respect she has on the farm. The hierarchy on the farm is one of the main problems through the book. It causes jealously, rivalry and trouble. Curley’s wife status on the farm is right at the bottom. I feel that throughout the book she’s always thriving to reach some sort of status or level within the community on the farm. I think this because in the book when she asks what happened to Curley’s hand and they don’t tell her she calls them all names, ‘Standin’ here talking to a bunch of bindle stiffs -a nigger an’ a dum-dum and a lousy ol’ sheep. ‘ This shows Curley’s wife trying to grasp some sort of confidence by humiliating the other characters. By calling them names she feels almost superior and special, which is what she always wants. Women are treated with very little respect and were never equal to men in this time. She belongs to Curley like an object or a possession. This is when her lonely victim side of her shines through because she is treated so badly we feel sympathy and sadness for her. A good example to show how women are treated in this day is by her name. In the book we always refer to her as Curley’s wife and never know her actual name that shows how controlling and male-dominated the farm is towards women. At the point in the book where she dies our troubling/ attention-seeking hatred towards Curley’s wife disappears as a sympathetic and sad feeling takes its place. When she tries to break free of Lennie and squirms in his arms we feel a sudden sadness for her, although some people would say that she brought it on herself through her attention seeking ways, others would feel sympathetic. Steinbeck changes the image very well in this chapter, as we start to doubt our previous opinions on Curley’s wife. In the chapter it says, ‘And the meanness and the planning’s and the discontent and the ache for attention were all gone from her face. She was very pretty and simple, and her face was sweet and young. ‘ This extract reveals a completely different side to Curley’s wife and makes us think more deeply about our attitude towards her throughout the book. It quotes all the reasons we used to hate Curley’s wife in the past and compare it with her now, laying peacefully on the hay. Steinbeck changes Curley’s wife character a lot, which makes it hard to answer whether she is Miss Dynamite or a lonely victim. I think that Steinbeck’s intentions were to make us feel sympathetic towards her but also to have a hidden hatred for her previous attention-seeking character. In conclusion, I think that this question of whether Curley’s wife is Miss Dynamite or a lonely victim cannot be answered. Steinbeck changes the character too much throughout the book so that you can never pinpoint a true opinion. Only till the end do you realise a true sense of loneliness and sympathy, but while she was alive she was an annoying/ troubling character, which will always linger in our minds when we try to understand her image. Jemma Davis Show preview only The above preview is unformatted text This student written piece of work is one of many that can be found in our GCSE John Steinbeck section.