Developing Sensor Technology

Developing Sensor Technology Abstract The need for sensor devices has been growing to develop new applications in several technological fields. The current state-of-the-art of this sensor technology used in modern electronic nose designs to operate in a different manner. The chamber of the E-Nose sensor is to be upgraded mainly for reducing the nuisance alarms and to improve reliability to detect smoke which is caused by fire and non-fire particles. This paper gives a brief state of the art of different fire and non-fire particles that emits smoke and various chemical gas sensors used to detect smoke and a fire detection algorithm. Keywords- Sensors; Smoke; Electronic-Noses; Fire Detection Algorithm fire particles; non-fire particles Introduction The conception of an electronic nose could appear sort on an up-to-date technology. Scientists initial developed a synthetic nose within the 1930’s that used sensors to measure levels of ultra-violet light found in mercury. Currently these devices are employed in numerous technological fields for various applications. Presently these devices used as trendy fireplace detection frameworks for the simultaneous estimations of carbon monoxide gas (CO), carbon dioxide (CO2), and smoke. The concentration of the rates of CO and CO2 in smoke offers a path to cut back the frequency of nuisance alarms so as to extend the reliability of smoke detectors. The sensors that square measures incorporated during this fireplace sighting system at the side of fire detection algorithmic rule detect smoke that is caused by fire or non-fire particles, and alarmed accordingly. Previous fire detection systems used sensors for measuring temperature, smoke, and combustion products which include oxygen (O2), carbon monoxide (CO), carbon dioxide (CO2), water vapor (H2O), hydrogen cyanide (HCN), acetylene (C2H2), and nitric oxide (NO) but they does not give any reliable results. Some used Gas Chromatography – Mass Spectrometry (GC-MS) along with Fourier Transform Infrared (FTIR) Spectroscopy analyzed smoke [1]. Advances in fire detection systems are being sought to decrease the detection time and the frequency of unnecessary alarms. Most of the research works done with the Multi-Sensor Detectors for accomplishing these goals because there may have some trouble in using smoke detectors with a single sensor to discriminate the smoke produced from fire and non-fire sources. The 95% frequency of unnecessary alarms reported by smoke detectors during the 1980’s in the U.S. is due to that limitation. Section 1 briefly introduces the Fire Detection System incorporated in an Electronic-Nose and different Gas Sensors that detects smoke in Section 2. Later, section 3 gives a brief description about the Fire and Non-Fire Particles and how the sensory system is designed in an E-Nose for preventing Fire accidents in section 4. Finally, we concluded in Section 5. Chemical Gas Sensors The environment needs to be monitored [2] time to time as many accidents took place lack of it. So in order to control the Industrial Process, Chemical Sensing Technologies has been emerging out to mainly emphasize on Control of combustion processes (oxygen) Flammable gases in order to protect against Fire Explosion. Toxic gases for environmental monitoring. Solid Electrolyte Sensor SE sensor [3] [4] is based on the principle of electrochemical gas detection, which is used to detect chemicals or gases that can be oxidized or reduced in chemical reactions. It mainly contains three electrodes: A sensing or working electrode which reacts when gas is available by either oxidizing or reducing the target gas. A counter electrode which provides a comparing converse response to that occurring at the sensing electrode so as to provide a net current stream. A reference electrode that stays unaffected by the chemical reactions occurring on the sensing and counter electrodes and provides a stable potential against which measurements are frequently created. Figure 1. Solid Electrolyte Sensor SEC sensors (Figure 1) used in millions of vehicles to monitor the exhausted gases and minimize the toxic emissions. Thermal-Chemical Sensors Thermal-chemical sensors [2] works on principle that there will be a change in temperature (à ¢Ã‹â€ Ã¢â‚¬  T) when heat energy is released or absorbed (à ¢Ã‹â€ Ã¢â‚¬  Eh). The pellistor is the most common thermal-chemical sensor (other thermal sensors are based on either on thermistors or on thermopiles). They are used for monitoring of combustible gases. Figure 2.Thermal-Chemical Sensors Gravimetric Chemical Sensors They are also known as piezoelectric sensors [5]. They are of two types used for gas sensing – Surface Acoustic Wave (SAW) device and the Quartz Crystal Micro Balance (QCM) as in Figure 4. Figure 3. SAW Device Figure 4. Quartz Crystal Balance SAW device produces a surface wave that travels along the surface of the sensor while the QCM produces a wave that travels through the bulk of the sensor as shown in Figure 3. Both work on the principle that a change in the mass of piezoelectric sensor coating due to gas absorption results in a change in the resonant frequency of exposure to a vapor. Conducting Polymer Sensor: Conducting polymers [2] are plastics and they change their resistance while they adsorb or desorb specific chemicals (Figure 5). The adsorption of these chemicals mainly emphasized on the polarity (charge) and their molecular structure (shape and size). Figure 5. Conducting Polymer Sensor Due to their high sensitivity, low price and rapid response time at room temperatures, Conducting Polymer Sensor best suits for chemical sensing. IR Spectroscopy Sensors: The Spectroscopic Sensors [2] determine the concentration of several gases at a time and they work on the principle that all the gases interfere and adsorb infrared spectrum at specific wavelengths due to their natural molecular vibration. Some systems with narrow band interference filters or laser light sources for a specific gas (like CO2) are termed as monochromatic systems. Figure 6. IR Spectroscopy Sensors In the above Figure 6, some concentration of CO2 present in the sample gas is absorbed by the infrared detector at a wavelength of 4.3 ÃŽ ¼m while an infrared light periodically emitted from the light source. These sensors are most suitable for CO2 gas and shows low cross-sensitivity with different gasses and are moderate at the reaction, fairly good at accuracy and linearity but are cumbersome and costly. Optical Fiber Sensors The optical fiber utilized as a locality of those sensors [6] is coated with fluorescent dye. On association with the vapor, the Polarity variations within the fluorescent dye will changes the dyes optical properties such as wavelength shift in fluorescence, intensity and spectrum changes. These optical as in Figure 7 changes are used as the retaliation mechanism for gas. Figure 7. Optical Fiber Sensor Optical gas sensors are mostly used to detect concentrations of ammonia (NH3). They have very fast response times, short of what 10 micro sec for sampling and analysis and are compact; lightweight can be multiplexed on a single fiber network, immune to electromagnetic interference (EMI) and can operate in high radiation areas. MOSFET Sensors: The metal oxide semiconductor field-effect transistor (MOSFET) sensors [4, 7] based on a change of electrostatic potential. They comprise of three layers, they are catalytic metal also called the gate (palladium), a silicon oxide insulator (platinum) and a silicon semiconductor (iridium or rhodium) as in Figure 8. When polar compounds interact with this metal gate, the current flowing through the sensor is modified. Figure 8. MOSFET Sensor [7] As no hydrogen atoms are released, molecules such as ammonia or carbon monoxide cannot be detected with a thick metal layer. But it can be possible to detect them when the metal gate is thinned. These MOSFET sensors or MOS sensors are very robust and have a relatively low sensitivity. E-Nose as Fire Detection System An electric or artificial nose can sense different types of chemicals and even distinguish particles not only for identifying individuals, but also used for the detection of fire. They work on the principle that smoke is made up of different chemical compounds. These devices consist of dozens of sensors that sense different types of chemical compounds found in the air. Some of the chemicals that cause smoke leads to flames are discussed below. Smoke It is a collection of solid and liquid particulates in air and emits gases when a material undergoes combustion or pyrolysis [8]. This is a commonly an unwanted by-product of fires (including candles, stoves, fire ramp and oil lamps), but may also be used for fumigation i.e., pest control. Smoke signals is communication for long distances like smoke signals to transmit signals, news or to indicate the people to gather in a place, offensive and defensive capabilities in the military (smoke-screen), cooking, or smoking like marijuana, tobacco and etc.). Heptane: It is a non-polar solvent and minor component of gasoline [9] with chemical formula H3C (CH2)5CH3 or C7H16. This is a colorless liquid and very hazardous chemical that appears which sense like petrolic odor. The structure of Heptane is shown in Figure 9. Figure 9. Heptane Structure It is commercially available as mixed isomers for use in paints and coatings and mainly applied in pharmaceutical manufacturing laboratories and for research development. It has a melting point at −91.0 to −90.1 °C; −131.7 to −130.3 °F; 182.2 to 183.0K Toluene It is a fragrant hydrocarbon (Its IUPAC deliberate name is methylbenzene) [10] is broadly utilized as a solvent and as an industrial feedstock. It is a water-insoluble clear liquid with the typical smell of paint thinners. In some cases toluene is also used as an inhalant drug for its intoxicating properties; on the other hand, breathing in toluene can possibly cause serious neurological damages. Figure 10. Toluene Structure Toluene (Figure 10) is principally utilized as a precursor to benzene. The second positioned application includes its disproportionation to a mixture of benzene and xylene. Methanol Methanol is the simplest alcohol, and is a light, unstable, colorless, ignitable fluid with a unique smell as same as to, however marginally sweeter as that of drinking alcohol which we called as ethanol [11]. It is otherwise referred as methyl alcohol, wood alcohol, which is produced as a by-product of the destructive distillation of wood, wood naphtha or wood spirits, with the formula CH3OH for the structure in Figure 11 (often abbreviated MeOH). Figure 11. Structure of Methanol It is likewise utilized for delivering biodiesel by means of transesterification response. At room temperature, it is a polar fluid, and is utilized as a liquid catalyst, dissolvable, fuel, and as a denaturant for ethanol. Methanol is created regularly in the anaerobic metabolism of numerous mixtures of microbes, and is normally present in little sums in the earth. HDPE Beads High Density Poly Ethylene Beads [1] are white hermoplastic base resin and looks like wax and have the properties of electric wire. Figure 12. HDPE Beads HDPE Beads in the above Figure.12 used for extrusion packaging film, rope, woven bags, fishing nets, water pipes; injection of low-end commodity and housing, non-bearing load components, plastic box, turnover box; extrusion blow moulding containers, hollow products, bottles and it has society of plastic industry resin ID code is 2. Mixed Plastics Blended plastic [12] shown in Figure 13 is a term that covers all non-container plastic bundling sourced from the wastage of households, and it incorporates inflexible and adaptable plastic things of different polymer types and shades. It excludes plastic bottles and non-packaging items. Figure 13. Mixed Plastics Dry Ice: Figure 14 shows that it is the strongest manifestation of Carbon dioxide and fundamentally utilized as a cooling agent. It transmutes at −78.5  °c (−109.3  °f) at Earth atmospheric pressures. This great frost makes the strong perilous to handle without protection due to burns caused by freezing (frostbite). It is referred as Card ice [13]. Figure 14. Dry Ice Fire Detection Mechanism in E-Nose A Novel technique should be employed in E-Nose to respond immediately whenever the fire accidents took place [14]. The main objective of this mechanism is to reduce the nuisance alarms. Several experiments are conducted on various materials that causes smoke and observed how the materials go on burning while ignited them. The table 1 indicates that the ignition method and fire type (how the material burns) of the particular material which causes fire. Every E-Nose contains a sensory system (two components in E-Nose one is sensory system and the other component is a pattern recognition system [15]) and we need to enhance it so that it can be used as the fire detection system. In the sensory system, one among the above mentioned gas sensors are selected such that they detects particular material’s smoke and according to the classification algorithm and differentiate it whether the smoke is from fire and non-fire particles. Table 1: List of Particles Causes Fire The following Figure 15 shows the internal design of sensory system to be deployed in the E-Nose for reducing nuisance alarms as well as to react accordingly to the material that causes a fire. Figure. 15: Mechanism of Fire Detection System Based on type of these chemical compounds, the system can give information to the clients about the Fire and Non-Fire particles [16]. The system will perform the perfect action by ringing alert and empowers the fire extinguisher to keep the spreading of kindle to some degree by grouping fire and non-fire particles. The accompanying Table 2 gives the brief description of distinct fire extinguishers feasible in the market. Table 2: Types of Fire Extinguishers Where each Extinguisher specifies the classes of fires and they are listed below gives the details of their contents for which they belong to. Table 3: Classes of Fire Conclusion and Future Work Presently many more fire accidents are taking place and most of them are regarded as nuisance alarms i.e., the sensors that detect smoke will ring the alarm even though it is not necessary. In order to overcome this problem, this paper provided a novel technology that which holds the potential to give numerous benefits in terms of fire accidents like to reduce the nuisance alarms and to increase the reliability of the sensors. This mechanism not only reduces the false alarms, but also prevents the danger by enabling the in-built extinguisher whenever the fire particle is sensed. In future, we have a tendency to develop the precise classifier algorithm to distinguish the smoke from fire and non-fire particles.

Computer network Essay

Connects three office computers and one computer used for Point-of-Sale (POS) services at each of your stores. You also want six (6) computers in the lobby/store where patrons can download music and you can run â€Å"training classes† for people to learn about using MP3 players and get other basic information. The two offices have to be connected into one cohesive network, sharing POS services and other critical company information. You also need to provide a â€Å"hand out† casual area for people to stop in and discuss music and connect wirelessly to the Internet (you might even offer free coffee to entice people to come in to your store). ï‚ · Provides adequate security for all of the company communications and documents (especially sensitive sales documents). All POS services must be protected. All general network access should be segmented from the company POS services. Fast and have additional capacity as the company grows Provides for centralized printing Supports the eventual addition of other stores to the network Provides customers with a general information Website and a secure Website where clients can buy services, and products Provides for limited downtime (24 hour downtime maximum) Provides for centralized management and control of the computers in the two stores, so that you can maintain the network from off-site Provides for long-term cost effectiveness Provides a suite of software tools for the employees to effectively communicate and a POS solution for the stores The company does not have any equipment. Your plan should include a complete network and computer system that meets these requirements and future expansion plans. The two store locations will (eventually) be within a five-mile radius of each other. The locations are within a suburban area that has current technological infrastructures and related technology offerings. The stores will need a sales system and print services for invoices. Complete your proposal including costs for computing equipment, network infrastructure, network servers, printers, and related hardware, software, and accessories. Include as much detail as possible as well as  justification as to your selections. Diagram and explain your physical network and computer design as well as the logical network design (server installation, domain layout, etc.). As you are a small business, cost is a major factor and should be minimized. Connects three office computers and one computer used for Point-of-Sale (POS) services at each of your stores. You also want six (6) computers in the lobby/store where patrons can download music and you can run â€Å"training classes† for people to learn about using MP3 players and get other basic information. The two offices have to be connected into one cohesive network, sharing POS services and other critical company information. You also need to provide a â€Å"hand out† casual area for people to stop in and discuss music and connect wirelessly to the Internet (you might even offer free coffee to entice people to come in to your store). ï‚ · Provides adequate security for all of the company communications and documents (especially sensitive sales documents). All POS services must be protected. All general network access should be segmented from the company POS services. Fast and have additional capacity as the company grows Provides for centralized printing Supports the eventual addition of other stores to the network   Provides customers with a general information Website and a secure Website where clients can buy services, and products Provides for limited downtime (24 hour downtime maximum) Provides for centralized management and control of the computers in the two stores, so that you can maintain the network from off-site Provides for long-term cost effectiveness Provides a suite of software tools for the employees to effectively communicate and a POS solution for the stores The company does not have any equipment. Your plan should include a complete network and computer system that meets these requirements and future expansion plans. The two store locations will (eventually) be within a five-mile radius of each other. The locations are within a suburban area that has current technological infrastructures and related technology  offerings. The stores will need a sales system and print services for invoices. Complete your proposal including costs for computing equipment, network infrastructure, network servers, printers, and related hardware, software, and accessories. Include as much detail as possible as well as justification as to your selections. Diagram and explain your physical network and computer design as well as the logical network design (server installation, domain layout, etc.). As you are a small business, cost is a major factor and should be minimized. Connects three office computers and one computer used for Point-of-Sale (POS) services at each of your stores. You also want six (6) computers in the lobby/store where patrons can download music and you can run â€Å"training classes† for people to learn about using MP3 players and get other basic information. The two offices have to be connected into one cohesive network, sharing POS services and other critical company information. You also need to provide a â€Å"hand out† casual area for people to stop in and discuss music and connect wirelessly to the Internet (you might even offer free coffee to entice people to come in to your store). ï‚ · Provides adequate security for all of the company communications and documents (especially sensitive sales documents). All POS services must be protected. All general network access should be segmented from the company POS services. Fast and have additional capacity as the company grows Provides for centralized printing Supports the eventual addition of other stores to the network Provides customers with a general information Website and a secure Website where clients can buy services, and products Provides for limited downtime (24 hour downtime maximum) Provides for centralized management and control of the computers in the two stores, so that you can maintain the network from off-site Provides for long-term cost effectiveness Provides a suite of software tools for the employees to effectively communicate and a POS solution for the stores The company does not have any equipment. Your plan should include a complete  network and computer system that meets these requirements and future expansion plans. The two store locations will (eventually) be within a five-mile radius of each other. The locations are within a suburban area that has current technological infrastructures and related technology offerings. The stores will need a sales system and print services for invoices. Complete your proposal including costs for computing equipment, network infrastructure, network servers, printers, and related hardware, software, and accessories. Include as much detail as possible as well as justification as to your selections. Diagram and explain your physical network and computer design as well as the logical network design (server installation, domain layout, etc.). As you are a small business, cost is a major factor and should be minimized. Connects three office computers and one computer used for Point-of-Sale (POS) services at each of your stores. You also want six (6) computers in the lobby/store where patrons can download music and you can run â€Å"training classes† for people to learn about using MP3 players and get other basic information. The two offices have to be connected into one cohesive network, sharing POS services and other critical company information. You also need to provide a â€Å"hand out† casual area for people to stop in and discuss music and connect wirelessly to the Internet (you might even offer free coffee to entice people to come in to your store). ï‚ · Provides adequate security for all of the company communications and documents (especially sensitive sales documents). All POS services must be protected. All general network access should be segmented from the company POS services. Fast and have additional capacity as the company grows Provides for centralized printing Supports the eventual addition of other stores to the network Provides customers with a general information Website and a secure Website where clients can buy services, and products Provides for limited downtime (24 hour downtime maximum) Provides for centralized management and control of the computers in the two stores, so that you can maintain the network from off-site Provides for long-term cost effectiveness Provides a suite of software tools for the employees to effectively communicate and a POS solution for the stores The company does not have any equipment. Your plan should include a complete network and computer system that meets these requirements and future expansion plans. The two store locations will (eventually) be within a five-mile radius of each other. The locations are within a suburban area that has current technological infrastructures and related technology offerings. The stores will need a sales system and print services for invoices. Complete your proposal including costs for computing equipment, network infrastructure, network servers, printers, and related hardware, software, and accessories. Include as much detail as possible as well as justification as to your selections. Diagram and explain your physical network and computer design as well as the logical network design (server installation, domain layout, etc.). As you are a small business, cost is a major factor and should be minimized. Connects three office computers and one computer used for Point-of-Sale (POS) services at each of your stores. You also want six (6) computers in the lobby/store where patrons can download music and you can run â€Å"training classes† for people to learn about using MP3 players and get other basic information. The two offices have to be connected into one cohesive network, sharing POS services and other critical company information. You also need to provide a â€Å"hand out† casual area for people to stop in and discuss music and connect wirelessly to the Internet (you might even offer free coffee to entice people to come in to your store). ï‚ · Provides adequate security for all of the company communications and documents (especially sensitive sales documents). All POS services must be protected. All general network access should be segmented from the company POS services. Fast and have additional capacity as the company grows Provides for centralized printing Supports the eventual addition of other stores to the network Provides customers with a general information Website and a secure Website where clients can buy services, and products Provides for limited downtime (24 hour downtime maximum) Provides for  centralized management and control of the computers in the two stores, so that you can maintain the network from off-site Provides for long-term cost effectiveness Provides a suite of software tools for the employees to effectively communicate and a POS solution for the stores The company does not have any equipment. Your plan should include a complete network and computer system that meets these requirements and future expansion plans. The two store locations will (eventually) be within a five-mile radius of each other. The locations are within a suburban area that has current technological infrastructures and related technology offerings. The stores will need a sales system and print services for invoices. Complete your proposal including costs for computing equipment, network infrastructure, network servers, printers, and related hardware, software, and accessories. Include as much detail as possible as well as justification as to your selections. Diagram and explain your physical network and computer design as well as the logical network design (server installation, domain layout, etc.). As you are a small business, cost is a major factor and should be minimized. Connects three office computers and one computer used for Point-of-Sale (POS) services at each of your stores. You also want six (6) computers in the lobby/store where patrons can download music and you can run â€Å"training classes† for people to learn about using MP3 players and get other basic information. The two offices have to be connected into one cohesive network, sharing POS services and other critical company information. You also need to provide a â€Å"hand out† casual area for people to stop in and discuss music and connect wirelessly to the Internet (you might even offer free coffee to entice people to come in to your store). ï‚ · Provides adequate security for all of the company communications and documents (especially sensitive sales documents). All POS services must be protected. All general network access should be segmented from the company POS services. Fast and have additional capacity as the company grows Provides for centralized printing Supports the eventual addition of other stores to the network Provides customers with a general information Website and a secure Website where clients can buy services, and products Provides for limited downtime (24 hour downtime maximum) Provides for centralized management and control of the computers in the two stores, so that you can maintain the network from off-site Provides for long-term cost effectiveness Provides a suite of software tools for the employees to effectively communicate and a POS solution for the stores The company does not have any equipment. Your plan should include a complete network and computer system that meets these requirements and future expansion plans. The two store locations will (eventually) be within a five-mile radius of each other. The locations are within a suburban area that has current technological infrastructures and related technology offerings. The stores will need a sales system and print services for invoices. Complete your proposal including costs for computing equipment, network infrastructure, network servers, printers, and related hardware, software, and accessories. Include as much detail as possible as well as justification as to your selections. Diagram and explain your physical network and computer design as well as the logical network design (server installation, domain layout, etc.). As you are a small business, cost is a major factor and should be minimized. Connects three office computers and one computer used for Point-of-Sale (POS) services at each of your stores. You also want six (6) computers in the lobby/store where patrons can download music and you can run â€Å"training classes† for people to learn about using MP3 players and get other basic information. The two offices have to be connected into one cohesive network, sharing POS services and other critical company information. You also need to provide a â€Å"hand out† casual area for people to stop in and discuss music and connect wirelessly to the Internet (you might even offer free coffee to entice people to come in to your store). ï‚ · Provides adequate security for all of the company communications and documents (especially sensitive sales documents). All POS services must be protected. All general network access  should be segmented from the company POS services.   Fast and have additional capacity as the company grows Provides for centralized printing Supports the eventual addition of other stores to the network Provides customers with a general information Website and a secure Website where clients can buy services, and products Provides for limited downtime (24 hour downtime maximum) Provides for centralized management and control of the computers in the two stores, so that you can maintain the network from off-site Provides for long-term cost effectiveness Provides a suite of software tools for the employees to effectively communicate and a POS solution for the stores The company does not have any equipment. Your plan should include a complete network and computer system that meets these requirements and future expansion plans. The two store locations will (eventually) be within a five-mile radius of each other. The locations are within a suburban area that has current technological infrastructures and related technology offerings. The stores will need a sales system and print services for invoices. Complete your proposal including costs for computing equipment, network infrastructure, network servers, printers, and related hardware, software, and accessories. Include as much detail as possible as well as justification as to your selections. Diagram and explain your physical network and computer design as well as the logical network design (server installation, domain layout, etc.). As you are a small business, cost is a major factor and should be minimized.

A Man’s Character Is His Fate to What Extent Is Othello’s Own Character?

‘A man’s character is his fate. ’ To what extent is Othello’s own character the cause of his downfall? According to Aristotle’s Poetics, a classical tragic hero should be renowned and prosperous, superior in some specific way, so that the reversal of fortunes or downfall, stirs up feelings within the audience of a greater intensity. Such disastrous results are often triggered by the mistake of the tragic hero due to their tragic flaw or hamartia, which is often linked to hubris or excessive pride.In Shakespeare’s Othello, as a General of the Venetian army, Othello meets these criteria, as his mistake is to trust ‘honest Iago’ and convince himself that revenge upon Desdemona will lead to honour and success. In fact, as with most tragic heroes, it is this decision which leads to his destruction. However, it is important to consider whether Othello’s ruin was the inevitable result of the defects in his character or whether the re were other forces, outside of his control, which led him to his doom.If it is solely Othello’s hamartia which leads to his downfall, then it must be related to the change in his perception of Desdemona. In Act 1, when warned by Brabantio that Desdemona may also deceive Othello, Othello retorts passionately: ‘My life upon her faith! ’ The exclamation here demonstrates the dedication and trust that Othello feels towards his new wife, but by Act 3, Othello is already beginning to doubt her: ‘By the world,/ I think my wife by honest, and I think she is not’ (3. 3. 389).Shakespeare’s use of cosmic imagery when Othello swears illustrates the magnitude of Othello’s resentment at his own hesitation, as his judgement is usually impulsive, as in Aleppo, (5. 2. 361) when he knew immediately to ‘smote him thus’, as he was certain of his enemy, but in this case, doubt has impaired his vision and he is unsure who to trust: his new wif e or ‘honest Iago’. Othello’s peripeteia occurs when he decides to trust Iago; however, the audience are surprised at this decision, as it is unclear what has changed his perception of Desdemona so that he condemns her as ‘that cunning whore of Venice’ (4. . 88). Some critics are of the opinion that it is jealousy that has clouded his judgement thus, and argue that this must be his hamartia. However, it is equally possible that Shakespeare has given Othello the ‘fitness of character’ that Aristotle stated was an important feature of a tragic hero, as his true hamartia may be his value of the honour-shame culture which existed among European Elizabethan warriors, and is linked to the hubris common in tragic heroes.It can be argued that the shame induced by the idea of his wife’s unfaithfulness results in his downfall, which Shakespeare expresses through animalistic imagery: ‘I had rather be a toad/ And live upon the vapour of a dungeon/ Than keep a corner in the thing I love/ For others’ uses’. Therefore, Desdemona’s murder becomes an act of sacrificial love: ‘A murder which I thought a sacrifice’ (5. 2. 64) as he feels that ‘else she’ll betray more men. Perhaps it is for this reason that, in his death scene, Othello says: ‘For naught I did in hate, but all in honour’ (5. 2. 301) and calls himself ‘An honourable murderer’. Either way, possible flaws like these suggest that Othello’s downfall was his own doing as such traits may have driven him to trust Iago and murder Desdemona, actions which in his anagnorisis led to extreme suffering, and caused him to commit suicide. Alternatively, Othello’s impulsive and passionate nature could also have contributed to his downfall, as this may have been his hamartia.This would fit the necessary ‘consistency’ outlined by Aristotle, as the same passion and instantaneou s response can be found in his reaction to Brabantio in scene 1 as in the later scenes, in his immediate reaction to Iago’s suggestive statements. At first Othello responds calmly: ‘Why dost thou ask? ’But the more evasive Iago is of such questions, the more it riles Othello and Shakespeare uses cosmic imagery when Othello swears such as ‘By heaven, I’ll know thy thoughts’ to demonstrate the value that Othello assigns to Iago’s opinions.When Iago eventually suggests that Desdemona is dishonest, Othello trusts Iago to ‘Give [him] the ocular proof’ (3. 3. 361), and some critics may argue that this rash decision to trust Iago is proof that Othello is impulsive, causing him to make foolish decisions. It is for this reason that he accepts Iago’s story of Cassio’s dream as the ‘ocular proof’ even though Iago admits ‘’Tis a shrewd doubt, though it be but a dream’; Othello immediately reacts: ‘I’ll tear her all to pieces! ’ (3. 3. 433).Shakespeare then uses dark and malignant imagery to show Othello’s passionate rage with phrases such as ‘Arise black vengeance’ and ‘tyrannous hate! ’ Such imagery would have been significant to an Elizabethan audience, as they considered the colour white to symbolise purity and goodness, whereas black had strong connotations of the devil, evil and uncleanness, thus highlighting the wickedness in Othello’s disposition. Therefore, this can be used as evidence that Othello was only convinced byIago’s improbable suggestions because he was led by passion and impulse, being ‘Perplexed in the extreme’ by rage, instinctively trusting Iago. The motif of blood that Shakespeare includes supports this: ‘O, blood, blood, blood! ’ (3. 3. 452) as it has connotations of violence, therefore foreshadowing the violence of the final act, in which the motif is repeated by Desdemona: ‘Some bloody passion shakes your very frame’ showing the connection between Othello’s hamartia and Desdemona’s murder.On the other hand, it can be argued that Othello’s downfall was not his own doing. In Act 3 scene 3, Shakespeare first suggests that Othello truly doubts Desdemona when he says, ‘And yet how nature erring from itself-’ (3. 3. 229) because he thinks that being white, Desdemona would prefer a white man like Cassio to himself. Such racial insecurities are highlighted in Othello’s character throughout the play, and may be the reason behind the pains that he takes to impress people through his speech and experiences.However this line implies that Othello’s doubt in Desdemona were the result of racial insecurities, and whilst they could be singular to him, the prejudices that existed against ‘Moors’ in the Elizabethan era, and in the play suggest otherwise. Queen Elizabeth com plained in 1601 of the â€Å"great numbers of Negars and Blackamoors which are crept into this realm,† 1 a feeling also expressed in the play when Othello is condemned as an ‘old black ram’ (1. 1. 89) and a ‘Barbary horse’ (1. 1. 111). Such animalistic metaphors emphasise the low opinion that Elizabethans had of ‘Blackamoors’, which may have been the root of Othello’s downfall.Similarly, the unconventionality of Othello’s marriage to Desdemona rebelled against Elizabethan ideology, being ‘contrary to nature’ as critic Karen Newman put it, which presented an obstacle in itself. Their marriage broke the natural order causing chaos and consequently, as in most tragedies, this chaotic force had to be destroyed for order to be restored. Such ideals may be evidence that the couple’s ruin was inevitable, as to an Elizabethan audience, they symbolised the unnatural, chaotic force which must be overthrown.Alterna tively, it is equally possible that although Othello had many flaws, it was Iago who acted as a catalyst by exposing them, thus causing Othello’s downfall. Shakespeare frequently alludes to this through recurring motifs which show Iago’s power of corruption, the first of these being poison. For example, when plotting, Iago refers to poison when he says: ‘I’ll pour pestilence into his ear’ (2. 3. 346), and then in the final scene, Lodovico summarises the 3 corpses as ‘poisons sight’, thus demonstrating the link between Iago’s manipulation and the plight of Othello and those around him.Shakespeare builds upon this manipulation through the motif of turning, as Iago vows to ‘turn her virtue into pitch’ (2. 3. 350), in the same way that Othello turns ‘Turk’ through the metaphor in his final speech, ‘an turbaned Turk†¦ traduced the state†¦ And smote him thus’ (5. 2. 349-52), and is evide nce of Iago’s success in turning Othello from a General into an enemy of ‘the state’. Similarly, the black and white imagery of ‘virtue’ and ‘pitch’ is repeated by Othello himself when referring to Desdemona’s reputation: ‘begrimed and black/As mine own face. However, ‘begrimed’ implies that both characters are stained, but as Desdemona is innocent, and Othello’s inherited ethnicity determines his skin colour, the simile could relate to Iago’s manipulation, and the darkness that he has brought upon the couple. This is mirrored by the transformation of Othello’s language: formerly grand verse depicting his former successes becomes sinister and dark, with animalistic imagery of goats, monkeys, toads, and poisonous snakes, and diabolic metaphors for Desdemona such as ‘fair devil’, which liken his language to that of Iago.These changes are evidence of the vital role of Iago in Othel lo’s downfall, suggesting that Othello’s flaws, although numerous, may not have been fatal. It is for this reason that the phrase ‘Perplexed in the extreme’ in Othello’s final soliloquy, can take on a double meaning, as although Othello’s passionate emotions of jealousy, rage, and shame clouded his judgement, Iago’s ability to manipulate, which Shakespeare has emphasised through his use of repeated motifs and imagery, could have been the other vital factor.It was this combination that influenced Othello to make the fatal and mistaken decision that Iago’s suspicions were correct and believe that his honour would be regained if he took vengeance upon Desdemona. Iago was only successful because of Othello’s hidden flaws, but equally Othello’s flaws were deeply buried within him, allowing him to become a General of the Venetian army, proving that they were not fatal, but aroused by skilful manipulators like Iago. 1584 words Bibliography †¢1 = http://www. suite101. om/content/elizabeth-i-motives-for-expulsion-of-blackamoors-from-london-a248507 †¢A. C. Bradley (1904) Shakespearian Tragedy, New York: Palgrave Macmillan †¢Beard & Kent (2008) AQA AS English Literature B, Cheltenham: Nelson Thornes †¢Marian Cox (2003) AS/ A-Level Student Text Guide, Othello, William Shakespeare Oxfordshire: Phillip Allan Updates †¢http://www2. cnr. edu/home/bmcmanus/poetics. html †¢http://www. britaininprint. net/shakespeare/study_tools/race. html †¢William Shakespeare (2003) Othello Edited by Norman Sanders Cambridge: Cambridge University Press

What is an Isothermal Process in Physics

The science of physics studies objects and systems to measure their motions, temperatures, and other physical characteristics. It can be applied to anything from single-celled organisms to mechanical systems to planets, stars, and galaxies and the processes that govern them. Within physics,  thermodynamics is a branch that concentrates on changes  of energy (heat) in the properties of a system during any physical or chemical reaction.   The isothermal process, which is thermodynamic process in which the temperature of a system remains constant. The transfer of heat into or out of the system happens so slowly that  thermal equilibrium is maintained. Thermal is a term that describes the heat of a system. Iso means equal, so isothermal means equal heat, which is what defines thermal equilibrium. The Isothermal Process In general, during an isothermal process there is a change in internal energy, heat energy, and work, even though the temperature remains the same. Something in the system works to maintain that equal temperature. One simple ideal example is the Carnot Cycle, which basically describes how a heat engine works by supplying heat to a gas. As a result, the gas expands in a cylinder, and that pushes a piston to do some work. The heat or gas has to then be pushed out of the cylinder (or dumped) so that the next heat/expansion cycle can take place. This is what happens inside a car engine, for example. If this cycle is completely efficient, the process is isothermal because the temperature is kept constant while pressure changes.   To understand the basics of the isothermal process, consider the action of gases in a system. The internal energy of an ideal gas depends solely on the temperature, so the change in internal energy during an isothermal process for an ideal gas is also 0. In such a system, all heat added to a system (of gas) performs work to maintain the isothermal process, as long as the pressure remains constant. Essentially, when considering an ideal gas, work done  on the system to maintain the temperature means that the volume of the gas must decrease as the pressure on the system increases.   Isothermal Processes and States of Matter Isothermal processes are many and varied. Evaporation of water into the air is one, as is the boiling of water at a specific boiling point. There are also many chemical reactions that maintain thermal equilibrium, and in biology, the interactions of a cell with its surrounding cells (or other matter) are said to be an isothermal process.  Ã‚   Evaporation, melting, and boiling, are also phase changes. That is, they are changes to water (or other fluids or gases) that take place at constant temperature and pressure.   Charting an Isothermal Process In physics, charting such reactions and processes is done using diagrams (graphs). In a phase diagram, an isothermal process is charted by following a vertical line (or plane, in a 3D phase diagram) along a constant temperature. The pressure and volume can change in order to maintain the temperature of the system. As they do change, it is possible for a substance to change its state of matter even while its temperature remains constant. Thus, the evaporation of water as it boils means that the temperature stays the same as the system changes pressure and volume. This is then charted with the temperating staying constant along the diagram.   What it all Means When scientists study isothermal processes in systems, they are really examining heat and energy and the connection between them and the mechanical energy it takes to change or maintain the temperature of a system. Such understanding helps biologists study how living beings regulate their temperatures. It also comes into play in engineering, space science, planetary science, geology, and many other branches of science. Thermodynamic power cycles (and thus isothermal processes) are the basic idea behind heat engines. Humans use these devices to power electrical generating plants and, as mentioned above, cars, trucks, planes, and other vehicles. In addition, such systems exist on rockets and spacecraft.  Engineers apply principles of thermal management (in other words, temperature management) to increase the efficiency of these systems and processes.   Edited and updated by Carolyn Collins Petersen.