Essay on fossil fuels free essay sample

Throughout history it is a known fact that humans depend on energy to satisfy basic needs. In order to meet these needs humans have gone to the extent of putting the environment at risk. Air pollution is currently one of the five leading causes of death worldwide and the usage of fossil fuels is a major factor contributing to this. (Future talk: clean renewable energy September 2013). Fossil fuels are finite sources of energy; while the demand for energy will continue to increase, there will still be a decrease in amount of fossil fuels available, which means humans will need to find other sources of energy. There are numerous sources of alternative energy; however the safest, cleanest and reliable source is the renewable sources of energy. Renewable energy, if expanded and explored, have great potential to replace fossil fuels. This essay will evaluate the different types of renewable energy resources in terms of its ability to replace fossil fuel without lowering the quantity or quality of energy produced. We will write a custom essay sample on Essay on fossil fuels or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Wind energy is one source of renewable energy that may have a chance of replacing fossil fuels. Wind energy is plainly the exploitation of the kinetic energy in the wind to produce electricity. Over time, the power capacity of wind has evolved as humans through research have found new and better ways to harness its energy and turn it into energy Figure 1 shows the time evolution of the global wind power capacity over the years along with a prediction for the future years. The principle behind harnessing wind energy is that when the force of the wind is passed through turbines, the movements of these turbines converts energy into electricity. The most commercial method of harnessing wind energy is though â€Å"wind farms† where hundreds of wind turbines (windmills) are spread over large plots of land. In comparison to fossil fuels, wind energy is better in a number of ways. It is more plentiful, widely distributed and also renewable which means there will never be a worry of it running out. Wind energy is also cleaner in terms of its affect on the environment. In comparison to fossil fuels wind energy releases no greenhouse gas emissions during operation. Also, in comparison to other sources of renewable energy, wind energy uses comparatively less land to operate. The overall cost per unit of energy produced is similar to the cost for new coal and natural gas installations. (Top 5 alternative power sources to replace fossil fuels, September 25th 2013). However, the problem with this source of energy is that the installing of turbines are not generally welcomed as it destroys the natural view and also generates a lot of noise pollution. Another more widely used sources of renewable sources of energy include solar power. Solar power is one of the most widely used sources of energy in place of fossil fuels. Solar power in simple words is the conversion of sunlight into electricity. A more large-scale method of harnessing energy is by using the concentrating solar power (CSP) technologies. CSP technologies focus’s the suns rays on mirrors which then reflects the sun rays to one central boiler where the liquid within in the boiler is heated and used to boil water. The steam produced is then used to drive a turbine and generate electricity. Critics of solar energy claim that solar power cannot be depended on as it is extremely intermittent. In other words the nature of solar energy cannot be depended on as it can easily change from time to time. However, improvements in technology and constant research have made solar power just as regular and accessible as fossil fuels. Different CSP systems use different liquids, but one common characteristic is that these liquids are usually able to attain the heat and remain warm for a long period of time (National Renewable Energy Laboratory, 2013). This way electricity can be produced during periods of peak need, on cloudy days or even after sunset. Another major issue very commonly brought up against the feasibility of solar energy is that it is expensive to install the equipment needed for CPS or the solar panels. However, what is very commonly overlooked is the cost of using fossil fuels. The extraction, mining and transportation of fossil fuels is already costly and as the years go by, and the depletion of fossil fuel will cause the prices off fossil fuels even more. On the other hand, when using solar power, the money only goes into the capital needed to install the equipment needed. Unlike fossil fuel, this is a one-time payment, which means overall the cost of using solar power is less than that of using fossil fuels (Future talk: clean renewable energy September 2013). Apart from wind energy and solar energy, another commonly used source of renewable energy is hydroelectricity. Basically, hydroelectricity is the power that is derived from the energy of falling water (Top 5 alternative power sources to replace fossil fuels, September 25th 2013). The forces within the currents are passed through turbines, which generates electricity. Water is 800 times denser than air therefore even the slowest flowing stream of water can yield quite a considerable amount of energy enough to compete with that of fossil fuels. Of the various means to produce hydroelectricity, the more widely used method used to harness hydroelectricity is through dams. The water in these flows through turbines, the energy force within this body of water causes the turbines to turn. The turbines are connected to generators. When the turbines turn, they make the generators move. The generators are the machines that produce electricity. There are many cases where dams have been implemented and are extremely successful; one famous case is the Bonneville Dam, which is one of the many dams in Columbia. It has 20 turbines and generates more than a million watts of power yearly, which is enough to power hundreds and thousands of homes and businesses. The largest power plant in the world is the Three gorges Dam. It has 26 turbines and generates a billion watts of power a year generating enough energy for the homes and businesses in the town of Sandouping located in Yiling District. This dam is a source of power for over 35,00 citizens in Sandouping. Hydroelectricity actually has a real chance of replacing fossil fuels, as it has been proven there are successful cases around the world where hydroelectricity is being used. The most major advantage is that hydroelectricity relies on water, which is a clean and renewable energy source. It has not chance of running out. Water is renewable because of the existence of the water cycle, water evaporates forms cloud and then rain downs on earth starting the cycle again. It is a fact that in the United States, hydroelectricity generates approximately 9% of the total energy supply. The facilities currently available in the U. S can generate enough hydropower to produce electricity enough to power 28 million households, which is equivalent to 500 barrels of oil. Renewable energy sources do stand a real chance of replacing fossil fuels if we can overcome the major obstacles in place. The first major obstacle is the intermittent nature of these resources. However although they are intermittent they also compliment each other, which means more than one source can be implemented at a time. What these resources have to be able to do is match the human’s power demand and by combining two sources of energy this can be achieved. The second major factor preventing the shift from using fossil fuels to using renewable sources of energy is the price factor. Although it may look like the price of using renewable source of energy is higher, this is actually not the case. The price of fossil fuels is actually higher due to the need to extract and transport it all the time, wherelse for renewable energy sources the capital will only go into installing the necessary equipment’s. To summarize my essay fossil fuels are a depleting source of energy that is polluting earth and will soon run out. We need to replace this source before it causes permanent damage. Renewable sources of energy, through research and improvements in technology have become much more dependable and has a real chance of replacing fossil fuels. It is overall cleaner and abundant in nature, along with that as a whole it is also relatively cheaper in comparison to fossil fuels.

Is Interracial Adoption Not Always Beneficial Social Work Essays

Is Interracial Adoption Not Always Beneficial Social Work Essays Is Interracial Adoption Not Always Beneficial Social Work Essay Is Interracial Adoption Not Always Beneficial Social Work Essay With many honeymooners there can frequently be a really similar job that they could meet, non being able to hold kids of their ain. While some twosomes could take to hold a alternate female parent, or other ways many of this shortly to be parents take the pick of acceptance. Adoption in the United States is a societal and legal procedure whereby a parent-child relationship is established between people non related by birth ( Fass ) . Originally acceptance was non recorded and was done spontaneously. While acceptance is a great manner for honeymooners to get down a household, non all types of acceptance are optimal. Interracial acceptance, as Vincent Parrillo provinces in the Encyclopedia of Social Problem that explains transracial acceptance and how it can be considered really controversial, provinces that transracial acceptance is known as acceptance that takes topographic point across the racial boundaries. While acceptance can be and frequently is really good to many kids s lives, interracial acceptances may non ever be the best thought because some kids may non see their cultural backgrounds and need to understand their cultural individuality. Adoptions in America has occurred and changed drastically over the past two centuries. In the beginning acceptance was self-generated and non recorded. In the Encyclopedia of Children and Childhood in History and Society, Paula Fass writes an article about acceptance in the United States, giving history and information about acceptance. Adoption has become a formalistic legal establishment governed by a hodgepodge of legislative acts in 50 separate province legal powers with increasing federal engagement ( Frass ) . With authorities engagement came uniformed criterions to modulate acceptances that take topographic point in the United States. As Frass says in her article Adoption in the United States , that some experts say that the Numberss of acceptance in the United States are every bit high as six out of 10 Americans are adopted. Frass, besides states, while acceptance began in the colonial period and these kids normally ranged in ages from six to sixteen, these kids were norm ally made to work for the household as an excess brace of custodies on the farms. By the mid 19th century, province legislative assemblies began to ordain the first acceptance statues, An Act to Supply for the Adoption of Children that is set into jurisprudence in 1851 in Massachusetts. Some beneficent adult females reformists who were located in New York City founded the first private acceptance bureau in 1911. Adoption is conveying a kid and an grownup together to organize a new lifelong relationship, where they can bond and experience life lessons together, and treats the kid to a life that they should hold. With the addition in acceptance after World War II, there were non adequate Caucasic kids available for acceptance. While most households wanted to follow these kids there was an addition in following the minority as a new thought of acceptance. This new thought of acceptance was referred to as interracial acceptance or transracial acceptance, which became a new stage that was traveling on in the United States. By 1965, transracial acceptance had become known as the little revolution ( Fass ) . This is when acceptance bureaus began puting African American babes with white households more often. In 1971, transracial acceptance reached its extremum, with 468 bureaus describing 2,574 such arrangements ( Fass ) . The most recent estimation of transracial acceptance was performed in 1987 by the National Health Interview Survey ( NHIS ) . The determination reveled that merely eight per centum of all acceptances include parents and kids of different races ( Adoption.com ) At this cli p this was non a great figure of kids but subsequently research shows that the Numberss continue to increase. An scrutiny by the New York Times of the 2000 census-the foremost in which information on acceptance was collected-showed that merely over 16,000 white family included adopted black kids. ( Times ) While this is a big figure, the nose count did non state if these kids are being exposed to their original cultural background or if these kids were merely populating their lives as if they were a white kid with a darker skin color so their parents and siblings. While these figure are great for the sum of kids put into loving places, their exact arrangement is non ever considered in their best involvement. While there is non a set jurisprudence that is consistent between all 52 provinces, many provinces have the same accent on race in acceptances. Congress did ordain one act that effected transracial acceptance. As stated in Andrew Morrison s article Transracial Adoption: the Pros and Cons and the Parents Perspective gives the pro s and con s of transracial acceptance and has a subdivision on Legal Treatment of Race in acceptance, and this where Morrision states: In 1978, Congress enacted the Indian Child Welfare Act of 1978 ( ICWA ) Prior to 1978, every bit many as 30 five per centum of Native American Children were being taken from their places, about ever to be raised by white households. These kids were sometimes taken under duress and fraud. The ICWA mandated a strong penchant for race matching for Native American acceptances, leting Native American kids to be adopted by non-Native American parent merely as a last resort. These kids were to be considered to be tribal resources that should be raised by the people that know their heritage the best. In most provinces adoption Torahs permit a greater accent on race than would usually be allowable under our fundamental law. Merely three states-Pennsylvania, Texas, and Wisconsin- categorically prohibit consideration of race in acceptance ( Altstein, Melli, and Simon ) . This shows that people are get downing to understand that race is to be considered for the well being of the kid. With this accent, it is besides the societal workers that have really of import function with transracial acceptances. Jo Daughetty Bailey believe that any type of transracial acceptance international or non is non ever good and that the kids have a opportunity of losing their cultural heritage and that there is a manner to extinguish this. aˆÂ ¦ societal workers in the field have a critical function to play in minimising this. By using societal individuality to the insta nce of international adoptees cultural individuality formation, it follows that a positive cultural individuality is best facilitated by exposure to information and experiences that communicate the built-in value of the kid s cultural group ( Bailey ) . With the societal workers using this theory less kids that are adopted would non hold to worry about losing their cultural individuality. While transracial acceptance can work good with some households, this is non ever true for other households. With the kids in transracial acceptances, they do non ever demo psychological jobs or different societal jobs but the households need to anticipate the kid to see many different major challenges throughout their childhood, and turning up into adolescences. McRoy provinces in his article An Organizational Dilemma: the instance of Transracial acceptance that black kids need to turn up in their cultural background: Black kids belong physically and psychologically and culturally in black households where they can have the entire sense of themselves and develop a sound projection of their hereafter. Merely a black household can convey the emotional and sensitive nuances of perceptual experience and reactions essential for a black kid s endurance in a racialist society. Human existences are merchandises of their environment and develop their sense of values, attitudes, and self-concept within their ain household constructions. Black kids in white places are cut off from the healthy development of themselves as black people. With African American households that are put into white families there is ever the fact that the kids are non traveling to see their civilization in a custodies on manner. When African American kids turn up with the same race parents they do non hold the issue of losing their background and civilization. With Caucasic households non cognizing the exact background of their adoptive kids, the household can non explicate what is traveling on with hard experiences that the parents have neer gone through being a different race. When an African American girl asks her parents what precisely she should make with her hair, the female parent does non ever have the exact reply for her girl. With the female parent non sing this turning up or even in maturity, she may non be able to give her girl the best advice available. As stated in Katharine Quarmby s article Untitled she states that an assiocation has pointed out this fact: The Assoication of Black Social Workers ( ABSW ) claimed in the 1980 s that transracial arrangements are a manner prolongation racialist political orientation . Their motto, that Love is Enough , still looms over the statement. They pointed out that white parents did non how to care for black kids s tegument or hair, that black kids could non walk down the street with their white relations without holding to give and account. This may do jobs within the household and do the kid seem as if they do non suit in. This is non how kids should experience while in a household adhering relationship. While many households that have an African American kid in their household will necessitate aid or aid from the African American community. With many people non desiring the kids to lose their cultural background, trust of the African American community is a must. With the kids being active in the African American community has a positive and negative consequence on the kids in interracial acceptance. With the contact with the African American community the kids are able to larn about their background and civilization. This will assist the kids be able to interact with fellow equals that are like them. While this may look like a good thought, this may besides set the kids in a place that they do non belong in their current household and do non suit in because their household members are non like them. This may do kids to experience superior to their fellow household members and may non understand precisely why their household is non like the other households that they met in the Afri can American community. Ron Nixon writes an article in the New York Times, explicating that the de-emphasis on race in acceptance is critized and explains how the adoptees feel. Many transracial adoptees say they struggle to suit in among their ain household members. ( Nixon ) These adoptees may non experience like they fit in among their household because they do non precisely look like the other members, or they may non understand why their playthings were non the same colour as their friends when playing with Barbie s or G.I Joes. While some people may reason that if there is a restriction on acceptances based on race that there would be fewer acceptances. The kids that are put into Foster attention would non be placed into a household every bit shortly as possible. We have seen what happens when race is allowed to be a consideration. Children are waiting in Foster attention to be adopted. ( Nixon ) Ms. Chaplin, quoted in the New York Times article, is an associate commissioner at the Administration for Children and Families at the Department of Health and Human Services, who said this states that the kids would be waiting much longer in foster attention, shows that race should non be a determinant factor when it comes to adoption. This lone states that interracial acceptance is merely good because there will be fewer kids to be taken attention of in Foster attention, non how the kids really will get by with the determination and how they will respond. While every kid needs to cognize and develop their cultural individuality this may look really hard being raised in a family that is non of the same cultural background. In households that there is an African American kid, most parents raise the kid as if they have the same cultural individuality as them and most parents do non even notice they are making so. While kids may look that they are making good and booming, non demoing any major reverses this is non ever the instance. Although the kids appeared to be booming and good adjusted harmonizing to standard steps, they are being brought up as idea they were white and had small or no contact with black [ s ] . ( Hayes ) . While these kids are making good in the eyes of many, the kids are non making good in the facet of the cultural individuality. The kids are get downing to bury or non even understand their cultural background. The kids in some instances do non even cognize how people of their ain cultural individuality live or ev en move. With the kids non sing this first manus, they may lose a really of import portion of their history. Nagel states his sentiment in Bailey s article A Practice Model to protect the Ethnic Identity of International Adoptees in 1996: Cultural individuality is influenced by both external and internal factors. External forces include societal constructions that serve to specify cultural boundaries, often for political or economic intents, such an affirmatory action policies that seek to right historical inequalities between groups aˆÂ ¦ However, such external forces form merely portion of the complex system of cultural individuality formationaˆÂ ¦ therefore, achieving an individuality is a procedure in which one actively constructs a construct of the ego from an array of societal groups. This states that cultural individuality is affected by external and internal factors that will neer travel off and that kids need to understand and be able to wholly turn and boom as a individual. Experts besides province that kids cognizing about their cultural individuality are better off when turning up. Both have adopted a discourse that stresses that kids have a demand or right to a sense of cultural individuality and cultural heritage. ( Hayes ) While interracial acceptance is a really popular signifier of acceptance, some households believe that following a kid of a different race may learn those new imposts and cultural influences that the kid would neer be exposed excessively. While learning kids about different cultural backgrounds and holding them see the civilization of their parents may do the kid seem more rounded. While this may look as a fantastic thought, holding a kid that is from a different ethnicity being able to understand and suit in with a different civilization. This may do the kid seem like they would neer suit in with their original cultural background. This should neer be the instance with a kid turning up. Bing able to associate to merely one cultural background, that is non their original is non ever good to the kid. While interracial acceptance may look like an first-class thought, to acquire kids out of poorness, and have them populating outstanding, fantastic lives with parents that can demo the counsel, love and fondness, the arrangement of the kids is a really of import issue to be concerned with. While these kids do unrecorded wonderful lives, these kids frequently wonder what life would be like if they would hold stay in their cultural community. While the kids placed with adoptive parents that treat them merely as if they were blood kids and are considered to be their kids. When an African American adoptee begins to travel through different stage of their lives, they will get down to travel rely on people of the black community. Harmonizing the National Association of Black Social Workers a statement in 1972, who was against interracial acceptance stated: These kids need the support and socialisation of black households merely every bit much as the Black community needs to keep and prolong its kids and households. Yet, in Contrast to the lightening processes of international acceptance, the transracial acceptance of black kids returning in maturity to the black community. In fact, one of the definitions of success in these arrangements is the formation of an appropriate racial individuality. While this states that the kids that are in interracial acceptances will frequently return to the black community later in life. While these kids may believe that they lived a fantastic life, they may ever go on to inquire how their lives would hold been if they would hold grown up in the black community with the changeless influence of other people that are considered to be more like them. When the kid is invariably with people of the same race or expression like the other people in the household they no longer have to oppugn why they are the colour they are, or how they do non fit the other childs in their vicinity if they live in a prevailing white vicinity. With this type of wondering could be the ground of why adoptee kids adventure back to the grownup community when they are in early grownup goon. While some kids that are an apart of an interracial acceptance do no experience any signifier of racism turning up there are ever kids that do see this. When kids are small, the bash non ever understand why their friends in school, who are non the same colour, are different colourss than them. With this kids can sometimes get down to dislike other for non being the same colour as them. This may be really disturbing for a kid that is the lone dark skinned kid of the household. This may besides do the kids to experience as if they do non belong in their household even though they are really loved by their adoptive parents. Children and parents may besides judge interracial households throughout their childhood and turning up, sometime even stating rude and objectionable things about the household, even though they have no thought about the state of affairs. With this the kids may experience like they do non suit in with the people that they are brought up about. While interracial acceptance has become really common in the United States, which can be considered a really first-class achievement in acceptance bureaus with a larger sum of kids being placed into caring and loving households. With this type of acceptances, acceptance bureaus are conveying different people together to organize new households ; there should be a consideration of where the kids are topographic point into such households. Interracial acceptance can be really good, seting kids into places, larning a new civilization, but it needs to be considered that these kids may lose their cultural background non populating with people of the same race. These kids may besides non understand racism wholly, even being the center of racialist remarks throughout their lives that will neer travel off. While some acceptance bureaus do non take the kid and how they may see things different into consideration, it should be made known that is non all about acquiring the kids out of Foster a ttention, but into a household that they will be able to associate to. This is about what is in the best involvement of the kid, non the parent. ( Nixon )

Programmable Logic Controllers Assignment Example | Topics and Well Written Essays - 750 words

Programmable Logic Controllers - Assignment Example The RES instruction is used to cancel the SET instruction, hence putting the PLC off. In the contemporary society, electronic devices are used in variety of ways. Electronic devices which make use of microprocessors rely on signals to understand information. Signals are available in two forms, i.e. Digital and analogue. Electronic devices can only understand information that is in digital format, and hence the analogue signals are meaningless in such devices. For this reason, the conversion of analogue to digital signals is essential, especially considering that most real life situations lead to the production of analogue signals. The analogue to digital conversion of information, changes the format of the information, without altering its content. Microprocessors are used for the conversion of the analogue signal to digital. The principle used in the conversion of analogue signals to digital signals by the microprocessor is the voltage variation. The microprocessor used sensors, which detect the incoming analogue signals, and translate them into voltage levels. For instance, the translation of temperature of 0 – 1000c, leads to the assignment of 0 volts to 00c, and 5volts to 1000c. Any value that is above 0volts represents an HIGH, and hence microprocessor can show the actual value, depending upon the number of levels the microprocessor can represent. The resolution of the A/D converter refers to the number of intervals which can be divided from a certain analog input range. Since the interpretation of the analogue input (e.g. temperature) requires assigning of voltage levels, the number of levels which can be represented is determined by the resolution. Resolution of A/D converter is represented in bits, for instance, an n-bit A/D converter has a resolution of 1/2n. The word length, as used in the microprocessors refers to the