The Impact Of Renewable Energy - 785 Words

The Renewables Portfolio Standard (RPS) aimed to influence residents to convert most of the state’s energy production into renewable energy. Based on the Califonia Energy Commision, in 2006, the standard requires 20 percent of electricity retail sales to be powered by renewable energy. The standard is then further improved to a targeted percentile of 33% in 2020 by Governor Arnold Schwarzenegger and moving forward to the current standard which is at 51% by 2030 by Governor Edmund G. Brown. As of June 2017, California is ahead of schedule and the state is currently 29% fully powered by clean energy. These data are proven by the California Energy Commission, there are no doubt that these numbers are true, but does it really contribute to the†¦show more content†¦Therefore, this model proves that if RPS was not introduced into California, there would be a massive amount of GHG emissions, more than any of the other policies in the electricity sector. Having said that, the usage of renewable energy remains a major factor in reducing carbon emissions in the country. Since most of the states in the country are still depending on fossil fuels as their main source of energy, it is crucial to execute standards such as RPS as it will definitely make a positive impact in terms of reducing carbon emissions. Although RPS is one of the major contributor in reducing GHG emissions, there is a more intensive program that reduces more GHG emissions every year, as discussed next. The cap and trade program, a more controversial and costly program which is also designed by CARB, is aiming to reduce GHG emissions to fully support their initiatives and to meet goals relating to AB32. CARB states that the cap and trade program is a market based regulation that is developed to lessen the emission of GHGs from several emitting sources. Dale Kasler (2017) from Sacramento Bee provides an insight on the program as he states that this program sets up a cap or limit onto industrial firms by providing a certain number of permits to all the firms. He also explains that firms have to eventually purchase more permits according to their needs fromShow MoreRelatedEssay on The Environmental Impact of Renewable Energy839 Words   |  4 Pagesamazing thing about renewable energy resources is that they do not deplete. These energy resources include energies such as hydroelectric energy, solar energy, wind energy, and geothermal energy. The major advantage of using these resource s is that the environmental impact is extremely low when compared to the use of fossil fuels and other energy processes. One of the most used renewable energy sources is hydroelectric power. When you look at all the environmental impacts of dams, etc., they seemRead MoreThe Environmental Impact Of Renewable Energy Sources1555 Words   |  7 Pagesthe spectrum are renewable energy sources, which consist of solar, wind, geothermal, hydro, and biofuels. The environmental impact of renewable energy sources is microscopic compared to the impact of fossil fuels. Specifically, I want to focus on the environmental impact of the production of electricity. Fossil fuels generated 68% of the electricity in the United States in 2013; on the other hand, renewable energy sources only produced 12.8% of the electricity (international energy agency, 2014)Read MoreWhat Is The Impact Of Renewable Energy, And What Is It Has Increase In Distribution Network?954 Words   |  4 Pagesputs up a discussion on impacts of high PV penetration level on distribution grid. High penetration of PV can cause problems such as reverse power flow, voltage rise, harmonics etc. This paper also discusses potential measures to mitigate these problems. Keywords – Distributed generation (DG), photovoltaics (PV), distribution network I. INTRODUCTION Due to growing environmental concerns, adoption of policies favoring renewables and governments incentivizing renewable energy technologies such as solarRead MoreThe Impact Of Climate Change On An Environmentally Safe Renewable Source Of Energy And Sequester Green House Gas ( Ghg )1572 Words   |  7 PagesGeoengineering techniques would buy time to develop an environmentally safe renewable source of energy and sequester Green House Gas (GHG) emissions. Over the years, climate change has become more apparent resulting in massive heat waves, heavy rainfall, and glacier and sea ice melting. Undoubtedly, economic growth and the growing population have resulted in an increase in demand of energy. David Keith, a Harvard physicist and energy policy expert, stated, â€Å"the rate of growth of our emissions is acceleratingRead MoreRenewable Electricity : Generating Electricity, Heating And Making The Food That We Eat1300 Words   |  6 Pages Generating Electricity 10/03/16 Introduction: There are several methods to generate electricity that we use daily for transportation, light, heating and making the food that we eat. Renewable and non renewable are the two types of energy resources available to us. The standard method of creating electricity has been by burning coal, releasing carbon dioxide into the air. It was perviously thought carbon dioxide created warming however this is strongly disputed now as the correlation betweenRead MoreThe Current Open Economy Of America Essay1490 Words   |  6 Pagespertains to government, influence the growth of the renewable energy industry in Australia and America. Overview of the Renewable Energy Industry in Australia The Clean Energy Council (2013), in a report on clean energy in Australia, reported that in 2013, renewable energy accounted for over 14% of Australia’s total power. Consequently, as the Clean Energy Council (2013) continues to state, more than 4.4 million households received utilized renewable energy power sources. Generally, the use of electricityRead MoreRenewable Is Sustainable For Renewable Energy1105 Words   |  5 PagesRenewable is Sustainable Soon, planet Earth will run out of the resource that once was thought to be reliable. Earth is in great danger of self destructing if there is no backup plan. This is where renewable resources come in. Renewable resources are abundant and do not damage the environment, so they are a sustainable method to produce energy. The options for renewable energy are solar, wind, hydro, biomass, and geothermal. Why should Earth abandon the systems that they have in place at theRead MoreRenewable Energy And Natural Gas1123 Words   |  5 Pagesexamined before the moral analysis is renewable energy, for example wind and solar power. Renewable energy is the least established method of generating electricity and is therefore still heavily tied up in research. By definition, renewable energy sources have a theoretically limitless amount of energy production since they do not deplete any resources through their use. This means that for as many years as humans inhabit the earth they can use renewable energies, such as solar, wind, hydro-power orRead MoreThe Effects Of Renewable Energy On The Environment1193 Words   |  5 Pagestechnologies that allow fulfillment of human needs while significantly reducing the human impact on the environment (About Green Technology, n.d.). Renewable energy can be defined as the energy generated from various natural sources such as sunlight,wind,water,geothermal heat and biomass, which are naturally replenished or renewed (What is renewable energy?, n.d.). The use of renewable energy helps in reducing the carbon dioxide and other carbon compounds that are emitted in to theRead MoreGlobal Warming Is A Serious Problem1177 Words   |  5 Pagesclosely linked to their life. Renewable energy has been approached to reduce realistic global warming in Australia. It could replace fossil fuel to make power generation. Renewable energy is a kind of energy, which could be recycled in nature world. In Australia, wind energy and solar energy is two important renewable energies with its inexhaustible and clean advantages of gaining the favour of the government. (Oxford, 2016) This essay would discuss that renewable energy could reduce global warming

Zz Packer Free Essays

ZZ Packer The Alternative Master Narrative â€Å"By our second day at Camp Crescendo, the girls in my Brownie troop had decided to kick the asses of each and every girl in Brownie Troop 909† (Packer p. 1). Not exactly how one would think a brownie girl would act, but that’s the trope, author ZZ Packer sets in every one of her stories, in Drinking Coffee Elsewhere. We will write a custom essay sample on Zz Packer or any similar topic only for you Order Now Like most authors, ZZ Packer has her own style of writing. She uses similar patterns and techniques throughout her collection of short stories. I will look at two of her stories and how they relate to her style of writing. â€Å"Brownies† is a story that many people of cultural value can relate too. This short story has many moral values in it. Brownies takes place at Camp Crescendo, a summer camp for fourth graders near the suburbs of Atlanta, Georgia. The story is told in first person by an African American girl named Laurel, also known as Snot. On the second day of camp Laurel announces to all the girls in her Brownie Troop that they were going to â€Å"kick the asses† of every girl in the troop, who were all white girls. The black girls disliked the white girls the minute they saw them. There ringleader Arnetta, said they smell â€Å"like chihuahuas. Wet chihuahuas† (Packer p2). The black girls have seen whites before, but they’ve never really had much to do with them. Being at the camp with them was the closest encounter they’ve ever had. which made it realistic and hard to not have any hatred towards them. This story is one of Packers most obvious labels that she usually talks about. As the story goes on, it follows another patten how the narrator of the story Laurel is a loner. Ever since the first grade she has always gotten made fun of, and got the nickname â€Å"Snot†. â€Å"The Ant of the Self† is another story that Packer talks about. It follows the themes of blacks to minorities, the presence of blacks on the east coast, and the main character Spurgeon is a â€Å"loner†. The Ant of the Self is a story about Spurgeon, the intelligent son of Ray Bivens Jr. Throughout the story he finds himself carrying the burden of supporting his self centered father on his shoulders. Ray doesn’t know the true meaning of an intimate relationship and is oblivious to his own son’s needs. When thinking about a father son relationship, you would imagine love, respect, laughter, and support, but when it comes to Spurgeon and his father, their relationship can be described as a business transaction. Spurgeon always supports his father, whatever it may be and he never gets any acknowledgement from his father for being there. In the beginning of the short story Spurgeon bails his father out of jail with money that he earned, and instead of his father showing appreciation or thanking him, he tells him â€Å"Opportunities. You’ve got to invest your money if you want opportunities† (Packer p82). The car ride home his Spurgeon’s father thinks of ways of making fast money, and comes up with an idea. Spurgeon tries telling his father that it’s a bad idea, but of course he doesn’t listen. This story, like many others ends with a the lack of a â€Å"happy ending†. How to cite Zz Packer, Essay examples

A critical analysis of a variety of art forms that explore the theme of murder mystery Essay Example For Students

A critical analysis of a variety of art forms that explore the theme of murder mystery Essay In this evaluation I am drawing conclusions from the coursework I have completed. This involved undertaking a critical analysis of a variety of art forms that explore the theme of murder mystery. I will be considering how well the art form examples studied have been used in expressing this theme and the methods they have used to do that. In the context of the murder mystery theme there are four pieces of work to discuss involving visual arts, dramatic arts and verbal arts. The pieces are: à ¢Ã¢â€š ¬Ã‚ ¢ The film dick Tracey à ¢Ã¢â€š ¬Ã‚ ¢ The painting Murder by Paul Cezanne à ¢Ã¢â€š ¬Ã‚ ¢ The Yorkshire Ripper à ¢Ã¢â€š ¬Ã‚ ¢ The play The real inspector hound by Tom Stoppard The Theme Murder and mystery are compelling themes that have always attracted interest and attention. Murder is a dark and gruesome action that can be described as evil but some killing such as destroying the enemy in a war is seen as sad but acceptable. It is all about death and that has a morbid fascination for people as there is something horrible about it. Its like a nightmare that is unpleasant but also exciting at the same time. We like to talk about it and wonder about it but we dont like it to happen to us. Because it is criminal it is also often associated with stories myths and mysteries. Who done it has always been a popular theme in fiction and in reality when murders cannot be solved and when people try to get away with it. Because it is awful and fascinating at the same time it is part of human life that is often covered in art forms. This is probably an attempt to try and make sense of something so cruel but also passionate Dick Tracey As a character Dick Tracey is an example of murder mystery through the detective story and crime genre. He is depicted as a good guy battling against bad guys and solving puzzles that bring murderers to justice. To do that he has to unpick a mystery and the way he does that by following clues and eliminating possibilities to get his man or woman is dramatic and satisfying. It keeps you guessing and ends up with the truth. This means the audience is taken through a story and is drawn into a dodgy world of gangsters and danger but where there is hope because in the end the good guy wins. The film uses visual art imaginatively to capture the mood and atmosphere of the time and to carry the audience into the drama and the mystery. It does this by evoking a time, a place and a culture of gangster America through the costumes, sets, cars, props the dialogue of the characters and there manner and behaviour. You know it is a story because it is a bit over the top but this isnt a mistake it is a way of getting the audience to know it is fictional and that gives it a lighter atmosphere than if it was real. The lighting and the moody style of some of the characters give a mysterious atmosphere and help the audience enter into the fantasy of the underworld. People know it is fantasy but they can for a while get into that and enjoy that. The Murder by Paul Cezanne This is visual art that depicts murder and mystery quite powerfully. Good visual art is atmospheric this means that it doesnt just show images but it captures moods and feelings. To do this a picture needs to suggest things and make you wonder about it. The murder does this through its title, the bleak and moody colours, the way action and movement is captured and the intensity of the positioning of the figures. .u1c42899d7fb8867fe038655d09e6b669 , .u1c42899d7fb8867fe038655d09e6b669 .postImageUrl , .u1c42899d7fb8867fe038655d09e6b669 .centered-text-area { min-height: 80px; position: relative; } .u1c42899d7fb8867fe038655d09e6b669 , .u1c42899d7fb8867fe038655d09e6b669:hover , .u1c42899d7fb8867fe038655d09e6b669:visited , .u1c42899d7fb8867fe038655d09e6b669:active { border:0!important; } .u1c42899d7fb8867fe038655d09e6b669 .clearfix:after { content: ""; display: table; clear: both; } .u1c42899d7fb8867fe038655d09e6b669 { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .u1c42899d7fb8867fe038655d09e6b669:active , .u1c42899d7fb8867fe038655d09e6b669:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .u1c42899d7fb8867fe038655d09e6b669 .centered-text-area { width: 100%; position: relative ; } .u1c42899d7fb8867fe038655d09e6b669 .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u1c42899d7fb8867fe038655d09e6b669 .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u1c42899d7fb8867fe038655d09e6b669 .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u1c42899d7fb8867fe038655d09e6b669:hover .ctaButton { background-color: #34495E!important; } .u1c42899d7fb8867fe038655d09e6b669 .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .u1c42899d7fb8867fe038655d09e6b669 .u1c42899d7fb8867fe038655d09e6b669-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u1c42899d7fb8867fe038655d09e6b669:after { content: ""; display: block; clear: both; } READ: The Louisiana Purchase EssayThey are overpowering the victim who is powerless and this is horrible to see. It is an effective dramatic way of showing mystery. The Yorkshire Ripper Unlike the other three pieces studied the incident of the Yorkshire ripper is not fiction it is real. Its about real murders and real mysteries. The story of the ripper could be told in a book or a film or a radio broadcast. I chose to do it through a mocked up newspaper article. This was an opportunity to explore visual art through picture, layout and language. By using headings and typeface it was possible to make the story visually interesting and then adding in pictures and graphics gave it excitement and emphasised the bits I wanted to emphasise. It brought the drama out of the story. This is a creative way of communicating and made me realise how much power newspaper editors have in shaping stories. The Real Inspector Hound As a play this piece shows dramatic and verbal art in action. It uses the theme of murder and mystery to tell a dramatic story and to take the audience through a mystery. It is packed with double meanings and uses language and action to entertain the audience. The plot is complicated and confusing so you dont really know what the truth is. The characters add to the mystery and you wonder what is really going on. Although it is showing murder it is quite light-hearted and this makes it a satisfying and exciting experience for the audience. The direction on the stage with the positioning of the actors and the inclusion of double plots is a method that can be used in theatre to strengthen and add to the experience of mystery. You are left wondering what is really going on and who has killed who? Drama is an art form that allows directors to interact with an audience like this and manipulate peoples experiences through the actions, behaviour and language of the characters. Conclusion I have been studying how different art forms can be used to depict themes in this case murder and mystery. The pieces above all do this by telling a story that is based on something that fits within this theme but they use different methods, techniques and styles to achieve it. By doing this work I have learnt that there are a variety of possibilities in the different art forms that are used to communicate with people and affect them. Good pieces of art do this by fascinating people and causing them to wonder about something, to think twice. The main techniques that I have identified that do this in the pieces I have analyised include: Visual art Colour, motion, action, lighting, space, layout, graphics, position Verbal art Speech, dialogue, language, emphasis, accent, volume intensity Dramatic art Behaviour, character, positioning, scenery, costume, personality, presence, interaction While these are different things they are often used together to create a stronger impact. They also have common themes and link together because they are all ways of communicating by catching peoples attention and affecting how they feel and what they think. Murder and mystery are dark things that worry and frighten people but also fascinate them. These art forms are ways of exploring some of these areas of human feelings and behaviours.

Water Level Indicator free essay sample

Generally when we are pumping liquids like water or may be any other liquid is we need a human to see whether the tank is filled or not or we will place a overflow pipe to know that the tank is fill or not in case of water tank and we get confirmed from the water coming from overflow pipe that the has been filled. ere is lots of wastage of water and still we need a human to have a look  over it and so to avoid this and to save wastage of water or any other liquid that is being filled. Here is a simple circuit for liquid level alarm this circuit only tells us when the tank is full with a beep sound. It is built around two BC547 transistors (T1 and T2) and two timer 555 ICs(IC1 and IC2). Both IC1 and IC2 are wired in a stable multi vibrator mode. We will write a custom essay sample on Water Level Indicator or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Timer IC1 produces low frequency, while timer IC2 produces high frequency. As a result, a beeping tone is generated when the liquid tank is full. Initially, when the tank is empty, transistor T1 does not conduct. Consequently, transistor T2 conducts and pin 4 of IC1 is low. This low voltage disables IC1 and it does not oscillate. The low output of IC1 disables IC2 and it does not oscillate. As a result, no sound is heard from the speaker. But when the tank gets filled up, transistor T1 conducts. Consequently, transistor T2 is cut off and pin 4 of IC1 becomes high. This high voltage enablesIC1 and it oscillates to produce low frequencies at pin 3. This low-frequency output enables IC2and it also oscillates to produce high frequencies. As a result, sound is produced from the speaker. Using preset VR1 we can control the volume of the sound from the speaker. The circuit can be powered from a 9V battery or from mains by using a 9V power adaptor. This circuit can  be easily designed and it is easy to Assemble the circuit on a general purpose PCB and we can enclose it in a suitable cabinet. The circuit is as shown below. Circuit of water level indicator 2) CIRCUIT DIAGARM: 3) How it works: The circuit contains I. Bc547 transistors II. Ic 555 timers III. Resistors IV. Capacitors V. Speaker/Buzzer/alarm VI. 9v power supply(battery/ 9v adaptor) VII. Preset VIII. PCB Here we will install two water-level probes using metal strips such that one touches the bottom of the tank and the other touches the maximum level of the water in the tank. Interconnect the sensor and the circuit using a flexible wire as shown in above circuit diagram. hen tank is empty or until the liquid touches the probe present at maximum level the transistor T1 doesn’t conducts and then output is high at collector of transistor T1, this drives the transistor T2 and transistor T2is in on state, and the output at collector of transistor will be low and as it is connected to  pin4(reset pin) this disables ic1(555timer) and output at pin3 which is also low and as it is connected to pin4 of ic2(555tim er) and the output is also low at pin3and it does not produce any sound . When the water or liquid level touches the second probe which is at maximum liquid level, the transistor T1 conducts and then output is low at collector of transistor T1, this drives the transistor T2 into cutoff and transistor T2 is in off state, and the output at collector of  transistor will be high and as it is connected to pin4(reset pin) this enables ic1(555timer) and output at pin3 which is also high and as it is connected to pin4 of ic2(555timer) and the output is  produced at pin3and it produces sound. nd by hearing sound we can confirm that the tank is filled with liquid and we can stop filling it. Also we need a human to switch on and off the  pumping of water, instead of speaker we can use a automatic switch which can switch off the  pumping automatically. 4) COMPONENTS DESCRIPTION: A) IC 555 TIMER The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation, and oscillator applications. The 555 can be used to provide time delays, as an oscillator, and as a flip-flop element. Derivatives provide up to four timing circuits in one package. Introduced in 1972 by Signetics, the 555 is still in widespread use, thanks to its ease of use, low price, and good stability. It is now made by many companies in the original bipolar and also in low-power CMOS types. As of 2003, it was estimated that 1 billion units are manufactured every year. ? PIN DIAGRAM: Pin 1 (Ground): Connects to the 0v power supply. Pin 2 (Trigger): Detects 1/3 of rail voltage to make output HIGH. Pin 2 has control over pin 6. If pin 2 is LOW, and pin 6 LOW,   output goes and stays HIGH. If pin 6 HIGH, and pin 2 goes LOW, output goes LOW while pin 2 LOW. This pin has a very high impedance (about 10M) and will trigger with about 1uA. Pin 3 (Output): (Pins 3 and 7 are in phase. ) Goes HIGH (about 2v less than rail) and LOW (about 0. 5v less than 0v) and will deliver up to 200mA. Pin 4 (Reset): Internally connected HIGH via 100k. Must be taken below 0. 8v to reset the chip. Pin 5 (Control): A voltage applied to this pin will vary the timing of the RC network (quite considerably). Pin 6 (Threshold): Detects 2/3 of rail voltage to make output LOW only if pin 2 is HIGH. This pin has a very high impedance (about 10M) and will trigger with about 0. uA. Pin 7 (Discharge): Goes LOW when pin 6 detects 2/3 rail voltage but pin 2 must be HIGH. If pin 2 is HIGH, pin 6 can be HIGH or LOW and pin 7 remains LOW. Goes OPEN (HIGH) and stays HIGH when pin 2 detects 1/3 rail voltage (even as a LOW pulse) when pin 6 is LOW. (Pins 7 and 3 are in phase. ) Pin 7 is equal to pin 3 but pin 7 does not go high it goes OPEN. But it goes LOW and will sink about 200mA. Pin 8 (Supply):Connects to the positive power supply (Vs). This can be any voltage between 4. 5V and 15V DC, but is commonly 5V DC when working with digital IC. INTERNAL BLOCK DIAGRAM: The LM555 is a highly stable controller capable of producing accurate timing pulses. With a mono stable operation, the time delay is controlled by one external resistor and one capacitor. This device features: Adjustable Duty Cycle, Turn off Time Less Than 2? Sec, Temperature Stability of 0. 005%/ °C, High Current Drive Capability (200mA) and Timing From ? Sec to Hours. The LM555 timer is applicable for Precision Timing, Time Delay Generation, Sequential Timing and Pulse Generation. The above schematic shows the LM555 Timer Internal Circuit Block Diagram. The Absolute Maximum Ratings (TA = 25 °C) of LM555 are as follows: |Parameter |Value | |Supply Voltage |16V | |Lead Temperature (Soldering 10sec)|300 °C | | |600mW | |Power Dissipation |(0 ~ +70) °C | |Operating Temperature Range |(-65 ~ +150) °C | |Storage Temperature Range | | | | | | | | | | | ? FEATURES: o High Current Drive Capability (200mA o Adjustable Duty Cycle o Temperature Stability of 0. 005%/ °C o Timing From  µSec to Hours o Turn off Time Less Than 2 µSec ? APPLICATION: o Precision Timing o Pulse Generation o Time Delay Generation o Sequential Timing B) BC 547 TRANSISTOR: [pic] |TECHNICAL SPECIFICATION: | |The BC547 transistor is an NPN Epitaxial Silicon Transistor. The BC547 transistor is a general-purpose transistor in a small| |plastic packages. It is used in general-purpose switching and amplification BC847/BC547 series 45 V, 100 mA NPN | |general-purpose transistors. | |The BC547 transistor is an NPN bipolar transistor, in which the letters N and P refer to the majority charge carriers | |inside the different regions of the transistor. Most bipolar transistors used today are NPN, because electron mobility is | |higher than hole mobility in semiconductors, allowing greater currents and faster operation. NPN transistors consist of a | |layer of P-doped semiconductor (the base) between two N-doped layers. A small current entering the base in common-emitter | |mode is amplified in the collector output. In other terms, an NPN transistor is on when its base is pulled high relative | |to the emitter. The arrow in the NPN transistor symbol is on the emitter leg and points in the direction of the conventional| |current flow when the device is in forward active mode. One mnemonic device for identifying the symbol for the NPN | |transistor is not pointing in. An NPN transistor can be considered as two diodes with a shared anode region. In typical | |operation, the emitter base junction is forward biased and the base collector junction is reverse biased. In an NPN | |transistor, for example, when a positive voltage is applied to the base emitter junction, the equilibrium between thermally | |generated carriers and the repelling electric field of the depletion region becomes unbalanced, allowing thermally excited | |electrons to inject into the base region. These electrons wander (or diffuse) through the base from the region of high | |concentration near the emitter towards the region of low concentration near the collector. The electrons in the base are | |called minority carriers because the base is doped p-type which would make holes the majority carrier in the base | BC547 TRANSISTOR CIRCUIT SCHEMATIC SYMBOL | |[pic] | |BC547 TRANSISTOR PINOUTS | |[pic] | |BC547 TRANSISTOR SOURCES | |The BC547 is very common and manufactured by ON Semi, Fairchild, and NXP. They can be purchased in small quantity for $. 03 | |to $. 20 depending on variation Mouser, Digikey both stock the BC547 samples. | | | C) RESISTOR: | | [pic] | |A typical axial-lead resistor | [pic]A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. The current through a resistor is in direct proportion to the voltage across the resistors terminals. This relationship is represented by Ohms law: [pic] where I is the current through the conductor in units of amperes, V is the potential difference measured across the conductor in units of volts, and R is the resistance of the conducto r in units of ohms. The ratio of the voltage applied across a resistors terminals to the intensity of current in the circuit is called its resistance, and this can be assumed to be a constant (independent of the voltage) for ordinary resistors working within their ratings. Resistors are common elements of electrical networks and electronic circuits and are ubiquitous in electronic equipment. Practical resistors can be made of various compounds and films, as well as resistance wire (wire made of a high-resistivity alloy, such as nickel-chrome). Resistors are also implemented within integrated circuits, particularly analog devices, and can also be integrated into hybrid and printed circuits. D) CAPACITOR: A capacitor (originally known as condenser) is a passive two-terminal electrical component used to store energy in an electric field. The forms of practical capacitors vary widely, but all contain at least two electrical conductors separated by a dielectric (insulator); for example, one common construction consists of metal foils separated by a thin layer of insulating film. Capacitors are widely used as parts of electrical circuits in many common electrical devices. When there is a potential difference (voltage) across the conductors, a static electric field develops across the dielectric, causing positive charge to collect on one plate and negative charge on the other plate. Energy is stored in the electrostatic field. An ideal capacitor is characterized by a single constant value, capacitance, measured in farads. This is the ratio of the electric charge on each conductor to the potential difference between them. Capacitors are widely used in electronic circuits for blocking direct current while allowing alternating current to pass, in filter networks, for smoothing the output of power supplies, in the resonant circuits that tune radios to particular frequencies, in electric power transmission systems for stabilizing voltage and power flow, and for many other purposes. The capacitor is a reasonably general model for electric fields within electric circuits. An ideal capacitor is wholly characterized by a constant capacitance C, defined as the ratio of charge  ±Q on each conductor to the voltage V between them: [pic] Sometimes charge build-up affects the capacitor mechanically, causing its capacitance to vary. In this case, capacitance is defined in terms of incremental changes: [pic] E) PRESET: A preset is a three legged electronic component which can be made to offer varying resistance in a circuit. The resistance is varied by adjusting the rotary control over it. The adjustment can be done by using a small screw driver or a similar tool. The resistance does not vary linearly but rather varies in exponential or logarithmic manner. Such variable resistors are commonly used for adjusting sensitivity along with a sensor. The variable resistance is obtained across the single terminal at front and one of the two other terminals. The two legs at back offer fixed resistance which is divided by the front leg. So whenever only the back terminals are used, a preset acts as a fixed resistor. Presets are specified by their fixed value resistance. Pin Diagram: F) BUZZER: A buzzer or beeper is an audio signalling device, which may be mechanical, electromechanical, or piezoelectric. Typical uses of buzzers and beepers include alarm devices, timers and confirmation of user input such as a mouse click or keystroke. Mechanical A joy buzzer is an example of a purely mechanical buzzer. Electromechanical Early devices were based on an electromechanical system identical to an electric bell without the metal gong. Similarly, a relay may be connected to interrupt its own actuating current, causing the contacts to buzz. Often these units were anchored to a wall or ceiling to use it as a sounding board. The word buzzer comes from the rasping noise that electromechanical buzzers made. Piezoelectric Piezoelectric disk beeper A piezoelectric element may be driven by an oscillating electronic circuit or other audio signal source, driven with a piezoelectric audio amplifier. Sounds commonly used to indicate that a button has been pressed are a click, a ring or a beep. G) PRINTED CIRCUIT BOARD: [pic] A printed circuit board, or  PCB, is used to mechanically support and electrically connect electronic components using conductive pathways, tracks, or  traces ,etched   from copper sheets laminated on to a non-conductive substrate. It is also referred to as printed wiring board(PWB) or  etched wiring board. A PCB populated with electronic components is a printed circuit assembly(PCA), also known as a printed circuit board assemble(PCBA). PCBs are inexpensive, and can be highly reliable. They require much more layout effort and higher initial cost than either  wire-wrapped or  Ã‚  point-to-point constructed   circuits, but are much cheaper and faster for high-volume production. Much of the electronics industrys PCB design, assembly, and quality control needs are set by standards that are published by the IPC organization. 5) SCOPE: This circuit only indicates the amount of water present in the over head tank, It gives an alarm when the tank is full. This worthy device starts ringing as soon as the water tank becomes full. It helps to check overflow and wastage of  water by warning the customer when the tank is about to brim. ? Now no need to go on the roof to look the water level. ? Alarm starts ringing as soon as tank becomes full. ? Suitable for every tank. ? Easy to make and economical circuit.

Adolescent Suicide essays

Adolescent Suicide essays Becoming a teacher, entering into a wonderful profession, also deals with many difficult issues. The problems faced by the adolescents of today has greatly changed, and even increased, from earlier times. Adolescent suicide is a dreadful, and ghastly problem that, as an educator, numerous will run into. It raises many questions: What are the statistics, and in what ways do children attempt to carry out a suicide? What are the reasons behind it? What are the warning signs to look for? Is there a difference between males and females? Does educating the children about suicide increase the rate? Are these children mentally ill or possibly depressed? What should be taken seriously? Is an attempt just seeking attention? What ways can a teacher, or a person close to them, help? The statistics, that scare any rational human being, involve a number and percentage that is much too large, and it is the second leading cause of death for adolescents among the ages of 15 to 19. It is also the second for college students, with homicide being the third. It is the fourth leading cause for those 10 to 14 years old, and the rate has more than tripled since the 1950s. As of September 1999, the rate was 13.8 per 100,000 children that committed suicide. For 10 to 14 year olds, from 1980 to 1992, it increased 120%. Although, over the last decade, it has gone up a total of 200%. Some of the ways these children either attempt or commit suicide depends on what is available. A myth that suicide is painless, glorifying it in the movies does not help, and it does not relate to the fact that many methods chosen are very painful. The reality is, pills, drugs, hangings, guns, or most of the many ways, involve agony and hurting. Having a firearm in the house also contributes to the chance that they will use it. Out of the suicide victims, ages 10 to 24, there are 64% that use a gun to complete the act. Just having a weapon in the ho...

Age Constraints on Second-Language Acquisition

Age Constraints on Second-Language Acquisition Introduction: The main topic of this study is to see if the age in which a child immigrates to America has any affect on their relationship with English. The authors tested native Korean speakers, all of whom moved to the United States at various ages on their understanding of English syntax and phonology. They were testing them to see if the critical period hypothesis stands. The critical period hypothesis rests on the belief that as a person matures, their brain begins to become lessÂÂ   plastic, and as the brain loses neural plasticity, it also loses its second language learning ability.ÂÂ   (Scovel, 1988; Patkowski, 1980, 1990). However, others believe that second language learning ability is related to how often the second language is actually implemented into conversations (Oyama, 1979; Flege, 1987, 1988, 1995, 1998b; Bialystok, 1997). The authors are trying to see which of these two theories are valid; the maturational theory or the interactive theory. While bot h theories have yielded supporting evidence, there is not enough data to know which theory is more valid. Also, it is difficult to test the critical period theory because there can be multiple factors contributing to why a child is unable to acquire language past a certain age. The authors hypothesis is that age of arrival does have an affect on the relationship they will have with English as their second language. Methods: The authors tested 240 native Korean speakers. All of these people had immigrated to America between the ages of 1 and 3, and had lived in America for at least 8 years. Their age at the time of testing ranged from 17 to 47 years old. There were also 24 native English speakers in the study, and their ages ranged from 20-45. They used the discontinuity theory for this study. The discontinuity theory is the idea that development occurs in a series of distinct stages rather than gradually in a continuous process. The participants were split into 10 groups based o n their age of arrival to the United States. Most of the participants completed high school in the United States, and many also went on to higher education in the US as well. Participants were tested on an individual basis by bilingual Korean-English research assistants in an hour and a half study session. The participants were asked to repeat English sentences that were later examined by 22.05 kHz where they were normalized for peak intensity. They were thenÂÂ   judged by native English speakers for degree of foreign accent by having them rate the sentences on a scale 1-9 from strong foreign accent to no accent. Now to test their morphosyntax, the participants were asked to take a 144 item grammaticality judgement test. In the test, they had a recording of a man speaking both grammatical and ungrammatical sentences, and the participants had to judge which were grammatical, and which were not. These were the two methods used to test if age of arrival had any effect on the relat ionship of learning English as a second language. Discussion: The aim of this study was to see if the age in which a person moved to the United States had any impact on their relationship with learning English as a second language. In the study, the authors tested 240 Native Korean speakers to see if their age of arrival affected the way they learned English as their second language. They were tested on their phonology by examining their accent for degree of foreign accent as well as their understanding of English morphology by having the participants take a 144 item grammaticality judgment test. The results showed that age of arrival had more of an impact on the participants morphosyntactic understanding compared to their phonological understanding. Based off the data, we could conclude that age of arrival definitely affects a persons relationship with learning English as a second language. This finding definitely supports the idea that a critical period exists when it comes to learning a second language. One problem with the study is that it does not explain why morphosyntactic understanding was affected more than phonological understanding. There could be a number of reasons contributing to this, and it is still unknown exactly why this is the case. I think that this study really helped to prove that there is a correlation between the age of arrival and ability to pick up a second language. However, more research needs to be conducted in order to understand exactly what factors are causing difficulties to arise in being able to learn a second language after a certain age. Also, more research could be done to find out exactly what age it is that second language learning ability starts to decrease. References: Flege, J. E., Yeni-Komshian, G. H., & Liu, S. (1999). Age Constraints on Second-Language Acquisition. Journal of Memory and Language , 41, 78-104

What was the most valuable thing that you learned in BUS656 this term Essay

What was the most valuable thing that you learned in BUS656 this term - Essay Example This concept provides numerous ways to create market segments that can be used to leverage business potential. The highlighted point is that of defensible market segments, which would actually help in capturing market share for a large as well as small business. The defensible market segments not only create business but also sideline competition from others in the industry. Creation of defensible market segments allows a particular business to stay on the top until competitors surpass the defensible segments with better products and/or customers’ needs change. Defensible segments can be of value with the positioning strategy of the business, especially in weak market segments. Understanding customers’ buying behavior and needs help in creating defensible segments. In addition, customer behavior in terms of frequency of purchase, attitude towards a particular product and a new product of the same brand can be advantageous to creation of defensible market strategy. Positioning strategy of products aimed at defensible segments provides opportunity to increase market share of new products. Greater product differentiation and an established brand automatically increase purchase size of customers, but cannot create defensible segments. This module highlighted the significance of defensible segments and acquiring market share as well as identifying market segments that can be used to find a slot for a particular product. Understanding markets will also help in designing products to meet the market/customer demands, which may be used for positioning the products. Once the market and customer needs are identified, it becomes simpler to find positioning strategies accordingly. It is difficult to capture greater market share of products that create defensible segments. Here, a strong positioning strategy would be of great value for the business. Positioning strategy helps in putting