Quantitative Determination of Atrazine

Quantitative Determination of Atrazine The objective of this study is to develop a simple and economic spectrophotometric method for the quantitative determination of atrazine. This method is based on the complexation of atrazine derivatization (dechlorinated atrazine [DA]) with a mixture of formaldehyde and ketone compound, as described by Mannich reaction. The complex was determined by UV-Vis absorption measurement and the ketone compound used was the uranine due to its high coefficient absorption. The UV spectrum of the complex shows maxima of absorption at 207 nm and at 227 nm. An internal standard was used to quantify the atrazine. There is a good linearity between the absorbance and the concentration in the range of 0.1 10 ÃŽ ¼g.mL-1 of atrazine. The recovery value was 97 % and the limit of detection was 0.01 µg.mL-1. Real samples collected from irrigation local area were analyzed using this method and the estimated concentration of atrazine found in the mentioned river is 0.29  ± 0.011 ÃŽ ¼g.mL-1. Keywords: Atrazine, dechlorination by zero valent iron, Mannich reaction, Spectrophotometer, quantification, internal standard, real samples measurements. Introduction Atrazine are widely used in agriculture, and their heavy use has resulted in the environmental pollution. Their persistent presence had been a serious problem, especially in surface and ground water systems. Atrazine herbicides were often used especially in Europe and the United States (1, 2), as important atrazine and simazine have been greatly used in maize cultivation and forestry. Their solubility in soil is low, and then can migrate along the food chains, and their intense use and presence in the environment have created a health threat to human beings. Recently, they have been considered as a group to be endocrine disrupting chemicals (3). The European Union Drinking Water Directive sets official regulations on the maximum admissible concentrations in drinking water as 0.1 mg.L-1 for an individual herbicide and 0.5 mg L-1 for total pesticides (4) whereas in surface water the alert and alarm threshold values are typically 1 and 3 mg.L-1 (5). Hence, the development of sensitive a nd economic analytical methods is very crucial for screening the presence and amounts of atrazine and preventing toxicological risks. In general, gas chromatography (GC) and high performance liquid chromatography (HPLC) are the techniques popularly used for the determination of atrazine and simazine (6-9). Gas chromatography-mass spectrometry (GC-MS), amperometric immunosensor, and adsorptive stripping voltammetric determination were developed for the analysis of atrazine and simazine, (10-13). In general, these techniques are expensive and involve time-consuming separation steps. These methods are unsuitable for field testing, for continuous monitoring or for screening high numbers of samples as required in mapping pesticide pollution in time and space. The objective of this work is to analyse the atrazine by a economic and rapid method. The proposed method in this work is based on the dechlorination of atrazine [DA] by zero valent iron powder (ZVIP), according to the reference fourteen (14) and using the [ DA] obtained in the Mannich reaction in order to give rise a by product having an extinction coefficient absorption more intense than atrazine compound. Materials and methods Chemicals and reagents All chemicals and solvents used were of analytical grade or of a higher grade when available. Formaldehyde, hydrochloric acid were purchased from Fisher, (MA, USA). Atrazine was purchased from Rodel-dehein, zero valent iron powder (350 mesh) was purchased from Sigma Aldrich Ultra pure water was prepared using a multi-Q filter system (Millipore, MA, USA). Instruments The UV absorption measurements were performed on a Shimadzu UV- 1650 PC. With 10 mm quartz cells were used for spectrophotometric measurements. The pH values are measured using METTLER TOLEDO pH-meter. Standard Solutions Stock solution of atrazine was prepared into a volumetric flask at a concentration of 10 ÃŽ ¼g.mL-1, 10 mL of this solution were mixed with 20 mL of acidified di-ionized water (pH = 4) and transferred into a flask of 100 mL. 2.5 g of zero valent iron powder were also added into the flask and shacked for 15 minutes. A complete dechlorinatation of atrazine must be achieved according to the previous work (14). This solution was in the Mannich reaction. Calibration Curves Samples for analysis were prepared by mixing uranine , formaldehyde and dechlorinated atrazine solutions. De-ionized water was transferred into each sample to reach a final volume of 10 mL. Calibration curves were built for quantitative measurements using the samples prepared according the table 1. Composition of samples used to build regression curve of the absorbance of the complex obtained by Mannich reaction and atrazine dechlorinated [DA] Internal standard curve addition and Recovery Atrazine dechlorinated was added as an internal standard for the calibration of the measurement, according to the method described in (Muel and Lacroix, 1960; Rima, Lamotte and Joussot-Dubien, 1982) (16, 17). Determination of the pH was done using a Mettler Toledo (OH, USA) pH-meter. Samples for analysis were prepared by mixing 0.5 ml of uranine (10 ÃŽ ¼g.mL-1), 1mL of pure formaldehyde and different volumes of dechlorinated atrazine stock solutions diluted to [0.75 ÃŽ ¼g.mL-1] (1-1.5 -2- 2.5 and 3 mL). De-ionized water was transferred to each sample to reach a final volume of 5 mL. Table 2 describes the preparation of the standard curve. Recovery experiments were performed by standard addition method: 0.15 ÃŽ ¼g.mL-1 of Atrazine dechlorinated was added to samples and percentage of recovery (R%) was calculated as follows: R% = [(Cr-Cf)/Cr] 100 Cr = Real concentration of atrazine in the fortified samples Cf = Concentration of atrazine obtained by the internal standard addition curve River water analysis The water analyzed was collected from River in the north of Lebanon.[agricultural area] 100mL of the polluted water were treated by zero valent iron powder according to the protocol mentioned above. The samples were fortified by solutions of dechlorinated atrazine having an initial concentration of 0.75 ÃŽ ¼g.ml-1 in order to build the internal standard curve. Table 3 summarizes the volumes of different solutions used in the mixtures. Results and Discussion Mechanism of the dechlorination of atrazine Most halogenated hydrocarbons, RX, can be reduced by iron metal. The overall reaction (Equation 1) results in dehalogenation of RX. Three general pathways by which this process may occur have been proposed (Matheson and tratnyek,) (18). The first involves direct reaction of the metal surface, in which case equation (A) alone adequately represents the pathway of reduction. The other two possible pathways do not involve the metal surface directly. Instead, Fe2+ and H2, which are products of corrosion by water, serve as the reductants that are directly responsible for dehalogenation of RX equation B and C. Fe0 + RX + H+ ↔ Fe2+ + RH + X- A 2Fe2+ + RX + H+ ↔ 2Fe3+ + RH + X- B H2 + RX ↔ RH + H+ + X- C More specifically the atrazine can be written as RX ( X = Cl ). With zero valent iron powder in the acidic aqueous solution the chlorine can be replaced by the hydrogen. According the following reaction: Effect of the dechlorination of atrazine on its extinction coefficient absorption. UV absorption spectra of atrazine in aqueous solution (1.5ÃŽ ¼g.mL-1) were recorded and compared to the spectra of the by-product obtained by the treatment of atrazine as shown in figure 1. Atrazine was dechlorination by zero valent iron powder according to the method described by Matheson, L.J et al (18). The extinction coefficient of the atrazine at the 220 nm (maximum of absorption) was estimated the value of 35200 M-1.L; whereas the extinction coefficient of the dechlorinated atrazine which give a maximum at 210 nm was found equal to 169000 M-1.L. Figure 1. The experimental observations revealed that by the removal of the chlorine atoms an hyperchromic and hypsochromic effects were observed. An increasing of the extinction coefficient and a blue shift from 220 nm to 210 nm of the maximum of absorption were detected. According to the table 4 , the proton that accompanies the formation of the free amine in Equilibrium 1 is available to protonate other reactants in the solution (Equilibria 2 and 3). Addition of the free amine to a protonated molecule of formaldehyde leads to the formation of the iminium ion shown at the right of (Equilibria 4). The enol of acetone then adds to the carbon atom of the iminium ion in (Equilibrium 5). In the equilibrium 1 as shown in the table 1, the nitrogen is enriched by electrons of the CH3 group and this nitrogen will react with H+ as base/acid reaction. However, when the electrons of the nitrogen, are deprived under the influence of the electron affinity of chlorine, this nitrogen will lose its basic character, then the à ©quilibre1 should be disturbed .In the other hand the nitrogen of the Equilibrium 4 play a nucleophilic role and ,if this nitrogen is disadvantaged by a chlorine attractive effect; it will lose the nucleophilic characteristics and the reaction with the carbon of the aldehyde in the Equilibrium 4. cannot be obtained In the case of atrazine it well known that the chlorine plays the role of the electrons donor to the nitrogen of the cycle and the electrons attractive of the aliphatic nitrogen. Since the Mannich reaction must take place at the aliphatic nitrogen not at the aromatic nitrogen and when the chlorine was removed by dechlorination process, the electrons at the aliphatic nitrogen become more dense and then it will be more able to play the role of nucleophilic atoms as mentioned in Mannich reation. In conclusion when the chlorine is removed from atrazine, the Mannich reaction can be observed as we demonstrated experimentally. Identification of the complex obtained in the mixture atrazine dechlorinated-formaldehyd and uranine The Mannich reaction is an organic reaction which consists of an amino alkylation of an acidic proton placed next to a carbonyl functional group with formaldehyde and ammonia or any primary or secondary amine. The final product is a ÃŽ ²-amino-carbonyl compound also known as a Mannich base. Reactions between aldimines and ÃŽ ±-methylene carbonyls are also considered Mannich reactions because these imines form between amines and aldehydes. Equation D (15). We hypothesized that the reaction between uranine, formaldehyde and dechlorinated atrazine must be similar to reaction E. The mechanism of the reaction is the following: Equation E Atrazine compound presents a UV spectrum with a maximum absorbance at 220 nm whereas dechlorinated atrazine presents a maximum of absorption at 210 nm Spectra of atrazine and dechlorinated atrazine are presented in Figure 1. The mixture of dechlorinated atrazine, formaldehyde and uranine give rise to the formation of a complex described by the Mannich reaction. It is obviously that formaldehyde does not have any UV spectrum. The UV spectra of the complex give rise to a spectrum with two maxima at at 207 nm and 227 nm respectively. Figure 2 presents the spectra of atrazine. dechlorinted atrazine and the complex obtained by Mannich reaction. Atrazine 2 ÃŽ ¼g.ml-1 (A) (DA  : dechlorinated atrazine by zero valent iron powder), (DA+ H2CO : dechlorinated atrazine by zero valent iron powder with formaldehyde) (DA+ H2CO + uranine : : dechlorinated atrazine by zero valent iron powder with formaldehyde) Regression curve between the complex formation A calibration curve of the complex was built to examine the linearity of the complex absorbance and atrazine concentrations. The least square method was used to calculate the regression equation. A strong linear correlation was obtained between the absorbance of the complex and the concentrations of atrazine. Figure 4 shows the regression curve of complex absorbance in function of atrazine concentrations. Correlation coefficients were higher than 0.99 in a concentration range of 0.15 ÃŽ ¼g.mL-1 to 0.75ÃŽ ¼g.mL-1.The precision of the method was evaluated with relative standard deviations (RSD) of atrazine determination in five samples. RSD was 3 %. The limit of detection of the method was 0.01 µg.mL-1 as defined by a signal-to-noise ration of 3:1 (19). Spectrophotometric method for quantification of atrazine e using the internal standard addition model A spectrophotometric method using the internal standard addition was examined to quantitatively determine melamine concentrations in samples. A calibration curve was described by the following equation: A*= aC + b, which is equivalent to A* = (A0* /C0) x Cadd + A0*, with A* = (A/ A0) normalized absorbance intensity (arbitrary values), is equal to the ratio of the absorbance intensity after adding the internal standard A to the absorbance intensity before adding the internal standard (A0) C0: solute concentration to be estimated. C0 is determined by the negative intercept of the curve with the abscissa axis (16, 17). A0*: normalized absorbance intensity of the starting solution Cadd: known added concentrations. The plot of A* vs. Cadd is shown in Figure 5. The internal standard used in this method was the atrazine that we would like to determine (C0). To this initial solution, different known concentrations (Cadd) were added. The average recovery for five samples spiked with melamine as described above in Table 1 was estimated to be 97%  ± 3. Table 5 summarizes the validation parameters of this method. Spectrophotometric method for the quantification of atrazine in a sample taken from an agricultural zone, using the internal standard method. Samples taken from a water source contaminated with atrazine, are processed by zero valent iron powder for the dechlorination of atrazine molecules. A definite volume of this solution is mixed with the same concentrations of formaldehyde and uranine. Different volumes of standard solution of dechlorinated atrazine were added to the solutions to be analyzed. The composition of these solutions are summarized in Table 3. The UV-Vis spectra of the solutions were recorded to follow the evolution of the complex obtained after the mixture called Mannich mixture. Using the evolution of UV-Vis spectra, an internal standard curve could be constructed and the intersection of this curve with the axis of abscises gives the concentration of atrazine in the waters of Agriculture . The concentration of atrazine in these waters is estimated at 0.29 ± 0.011 ÃŽ ¼g.mL-1 (n = 5). Conclusion The spectrophotometric method used to analyse the atrazine in agriculture water was based on Mannich reaction .This new method is a specific and simple method for the quantitative determination of atrazine in the contaminated water. Often the determination of atrazine is measured by sophisticated and expensive methods like HPLC, GC/MS. However the proposed method is easy to use, rapid and economic and it showed high accuracy, but it was restricted by the potentiality of the spectrophotometer which reaches a limit of detection of 0.01 ÃŽ ¼g.mL-1 as described in the manuscript.

Australia And War :: essays research papers

Name: Frank Trimboli Teacher: Ms Meyers Date: 23/3/98 Should Australia involve itself in wars which do not directly affect its security? Australia has involved itself in four wars where it has suffered substantial life loss and casualty. Those wars included World War 1, World War 2, the Korean War and Vietnam. Did Australia have to involve itself in these wars? Did the lives of these young Australians have to be taken? There is a high degree of complexity in this question. Should Australia, as a mature nation, be taking part in moral issues around the world even though they are not happening on our doorstep? Do we ignore the deaths in Bosnia, the starving millions in Biafra and Ethiopia, the worldwide environmental issues raised by Greenpeace? What is the purpose of developing alliances, both economic and military, with other countries? At stake, in all of these issues, is our desire for a better world to live in. In World War 1 (WW1), 1914-1918, Australian troops became involved in order to give support to the "Mother Country". Great Britain only became involved after Germany did not respect the neutrality of Belgium. In the first world war, Australian soldiers participated in some of the bloodiest and most enduring battles known to man, and soon developed a courageous name for themselves. Of the 330 000 Aussie soldiers who took part in WW1, there were 211 500 casualties and over 60 000 deaths, a casualty rate much higher than that of several other participants. The Australian participation in WW2 was similar to that of WW1 in many ways. After the British declared war on Germany on September 3rd 1939, an Australian declaration of war was automatic. Aussie troops were soon sent to different parts of the world to help the British and other allied countries. It was not until late 1941 that they were recalled in order to defend the homefront. Darwin had been suddenly attacked by Japanese planes and small enemy submarines had snuck into Sydney Harbour. Darwin was repeatedly bombed by Japanese planes until July 1941, when along with American troops, the Aussies managed to drive them out of the Solomon Islands and northeastern New Guinea and eliminate a strong Japanese base at Rabaul. Without General MacArthur's troops, the enemy may very well have invaded Australia. This illustrates the importance of alliances. Over 926 000 Australians fought in WW2, three times as many as in WW1. Of those 33 000 died, only half as many as in WW1.

leadership Essay -- essays research papers

â€Å"Unlocking the Potential of Your Employees: The Not-So-Secret Secrets of Motivational Leadership†   Ã‚  Ã‚  Ã‚  Ã‚  Leadership is executing strategy through others. The most demanding aspect of the job leadership is to get people to do what they are expected to do and to do it well and with motivations to overcome any barriers. â€Å"Successful execution begins with understand why people do what they do.†   Ã‚  Ã‚  Ã‚  Ã‚  This article talks about some insights into how to obtain and sustain employee commitment and motivation. The authors talks about how psychologist view motivation. Freud argued people are basically lazy and must be coerced to work. However, common sense alone says that if it were, true, managers would open all of their time watching people who refuse to cooperate.   Ã‚  Ã‚  Ã‚  Ã‚  Maslow came up with the â€Å"hierarchy of needs†. He said that people must meet his theory in sequence, before they can reach the next level. The needs start with basic physiological requirements and move on to safety, belonging, and esteem. The author claims that Maslow’s theory is incomplete because â€Å"employees who feel unappreciated and undervalued will often not feel satisfied at work and this may not work to their full potential.   Ã‚  Ã‚  Ã‚  Ã‚  According to David McClellan’s hypothesis said humans are motivated by achievement, power and affiliation.   Ã‚  Ã‚  Ã‚  Ã‚  The author writes how these psychological theories gi...

Binge Drinking On Americas Campuses Essay -- Binge Drinking College A

Binge Drinking on America's Campuses On any Friday or Saturday night, the average college student is usually drinking, dancing and out having fun. They typically party with friends at fraternity parties, bars, and clubs; and unfortunately most of these students are underage, consuming excessive amounts of alcohol or 'Binge Drinking'. Binge drinking results in several detrimental outcomes, some are even fatal. Today this type of drinking is rampant on educational campuses everywhere. Large and small, urban and rural educational institutions are not left unaffected by this growing trend to binge drink.   Ã‚  Ã‚  Ã‚  Ã‚  Binge drinking is defined as "the consumption of five or more drinks, in a row, on at least one occasion" (NCADI). Several surveys announce that about 1/3rd of high school seniors and 42 percent of college students binge drink on a regular basis(NCADI). Figures such as these are extremely upsetting because one expects institutions of higher learning to be the breeding ground for new leaders and innovative thinkers. Unfortunately, these statistics only make educational campuses appear, as if, everything is a party, much like National Lampoon's Animal House. Animal House is a 1980's movie dedicated to displaying college life and the experience in a college fraternity; it constantly depicted students binge drinking. Harvard University's School of Public Health conducted a College Alcohol study, surveying students at more than 119 colleges. Of those surveyed, 44 percent admitted to having engaged in binge drinking at least once in the two weeks prior to the survey (Booze News). Researchers discovered that white students, age 23 or younger, and members of a fraternity or sorority, on average are more likely to binge drink (Booze News). They also noted that students who were binge drinkers in high school, were three times more likely to binge drink in college (Booze News). "The percentage of students who are binge drinkers is nearly uniform from freshman year to senior year, and over half of the binge drinkers were frequent binge drinkers" (Booze News). Binge drinking has been associated with several alcohol-related problems. The Harvard survey also notes that "a higher percentage of binge drinkers than non-binge drinkers reported having experienced alcohol-related problems, since the beginning of the school year" (Booze News). Frequent bing... .... http://www.health.org/govpubs/phd627/binge.htm ?Booze News Fact Sheet: BINGE DRINKING ON COLLEGE CAMPUSES.? Booze News Newsletter. February 2,1999.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  http://www.cspinet.org/booze/collfact.htm Bormann, Carol A. and Stone, Michael H. ?The Effects of Eliminating Alcohol in a College Stadium: The Folsom Field Beer Ban(University of Colorado at Boulder).? Journal of American College Health, Sept 2001 v50 i2 p81. Brick, John. ?Alcohol Poisoning.? A publication of Intoxikon International. AOL Online. http://members.aol.com/intoxikon/alcohol.poisoning.html Buurma, Christine. ?U. Michigan student's death shows risk of binge drinking.? The Cavalier Daily Online Edition. November 16, 2000. http://www.cavalierdaily.com/Cvarticle.asp?ID=6604&Date=11/16/2000&Keyword=binge+drinking   Ã‚  Ã‚  Ã‚  Ã‚   Durand, Maria F. ?A Major Turning Point: MIT Case Causes Repercussions Throughout Nation.? ABC News Online. September 18, 2000. http://abcnews.go.com/sections/us/DailyNews/mit000915.html ?Media Project Launched to Combat College Binge Drinking.? Center for Science in the Public Interest (CSPI). November 20, 1997. http://www.cspinet.org/new/aluncorn.htm

What If Rizal Was Not Exciled

In July 1982 Jose Rizal was exiled as prisoner in Dapitan. When he arrived in Dapitan, he found it to be a sleepy little town. He thought of ways and means to make it clean, beautiful, and modern. With the help of his friend, father Sanchez, he made a map of Mindanao in front of the church. The map was made up of stones, earth, and grass and it serves as adornment that makes the town plaza beautiful. He and Father Sanchez, together with the citizens, had erected a lamp post in every corner of Dapitan.By stroke of luck, he won six thousand pesos from lottery ticket and he spent the amount in Dapitan. Modern agriculture implements were taken and transmitted from the United State and he taught the farmers how to use them. He bought sixteen hectares of land along the bay where he himself built a little house. He had become a farmer who himself worked hard, toiled, and happy in planting coffee and cacao and from 800 to 1,000 coconuts. (Retana, 1907) As a doctor, Rizal was aware of a wide spread of malaria due to mosquito bites.In order to get rid of malaria, he drained the swap where mosquitoes were staying. He also directed the construction of water system to have potable water for the town. (Retana, 1907) As a scientist, he collected, with the help of his pupils, different kinds of species of insects, birds, snakes, butterflies, shells, and plants which he sent, for purposes of identification, to Museum of Dresden in Europe. As payment of these species, Director A. B. Meyer sent him scientific books and journals, artificial eyes, microscopes, and surgical instruments since he did not accept money.He also discovered three rare specimens of animals that were named in his honor by European scientist, these were: Draco rizali which is a small lizard know as a flying dragon; Apogania rizali a rare kind of beetle; and the Rhacophorus rizali, a peculiar frog species. Rizal was also an inventor although he was not as inventive wizard as Thomas Edison. He invented a cigare tte lighter which he called Sulpakan. The lighter used a compressed air mechanism. He sent it as a gift to his friend, Dr. Blumentritt. He also invented a wooden machine for making bricks which can produce about 6,000 bricks per day. Bantug, 1946; Craig ,1957; Kalaw 1930; Zaide, 1984) Rizal put up a school where he himself was a teacher. There were formal classes conducted from two to five o clock in the afternoon. His students, all of them were seventeen who were sons of leading citizens in Dapitan, had learned from him Arithmetic, Geometry, and two languages, English and Spanish. (Craig, 1927) It was in Dapitan where he treated the eyes of her mother and he succeeded because her mother’s eyes were cured temporarily. Upon request of his mother when she returned in Manila after Rizal had treated her eyes, Rizal wrote a poem entitled My Retreat.Critics had agreed that this poem was the most profound and noble he ever composed, but, it was only second to My Last Farewell. (Reta na) George Taufer an American from Hong Kong proceded to Dapitan to have his eyes treated by Rizal. Mr. Taufer was accompanied by two young women, Josephine Bracken and Manuela Orlac. Rizal and Josephine met every time Mr. Taufer had scheduled for treatment. Because of their meetings, Rizal and Josephine fell in love with each other and they intended to get married. Rizal asked the Dapitan priest but the priest told him to secure permission to marry Josephine from Bishop of Cebu.However, upon learning about the marriage, Mr. Taufer attempted to cut his own throat but was prevented by Rizal by holding his two wrists. Mr. Taufer also became temporarily insane because he would loss Josephine if he married Rizal. When Mr. Taufer went back in Manila, Josephine went along with him in order to avoid tragedy. Josephine did not go to Hongkong when Mr. Taufer proceeded there. Josephine retured in Dapitan and there, Rizal and Josephine lived together like man and wife. (Russel & Rodriguez, 192 3) If Rizal was not exiled in Dapitan the forgoing events and circumstances could not have happened.Dapitan would still be sleepy little town because it was Rizal who had awaken it. Illnesses of malaria and diarrhea are prevalent because swamp would not have drained and there will no potable water, respectably. The implements for agriculture are not modern because Rizal could no have won 6,000 pesos in lottery ticket and therefore modern agricultural implement could not have been taken from the United States. There is nothing in Europe specifically in Museum of Dresden that a Filipino people can be proud of as of today because Rizal could not have sent more than 400 articles of scientific value.The European scientist could not have praise Rizal because he could not have discovered the three rare specimens of animals. In fact, the European scientist, as token of appreciation to Rizal, had named rare specimen the rare specimen in his honor. In effect, even in Europe Rizal is being rec ognize to be a science because of his discovery and collection of different specimen of animals and plants. He could not even be an inventor for having invented a lighter and a wooden machine for making bricks because if he is in Manila, he would be very active in reforming the friars through peaceful means.If Rizal did not meet Josephine in Dapitan, the retraction issue will not exist. To allow Rizal to marry Josephine, the Spaniards wanted Rizal to sign the retraction document which contain that he is denouncing all the books and articles that he had written against catholic religion; and he had regain his faith in catholic religion. However controversy arises because some believe that Rizal signs it and so he married Josephine Bracken. Others said that his signature was not genuine and he did not marry Josephine Bracken.If Rizal was incarcerated in Fort Santiago, his movement is limited to his prison cell. Instead of being a farmer, scientist, and inventor, his attention and work s would be focus in La Liga Filipina by writing about the abuses of friars and the reforms he wanted to undergo in governance by Spanish officials in the Philippines. (he is very accessible to he could still be imprisoned in Fort Santiago where his movement is confined in a prison cell. He could have been easily approached and consulted by Filipinos who wanted to stage uprising against Spanish government.If he was in Manila, he could have easily noticed the mistakes and mistreatments being done by the Spaniards to the Filipinos and therefore, he could have expressed his oppositions to these mistreatments. If Rizal was not exiled in Dapitan he could not have met Josephine whom he wanted to marry. Retraction controversy on Rizal regarding whether he became a catholic again or not could not have been an issue because the main reason why Rizal wanted to return in his religion is because he wanted to marry Josephine.La Liga Filipina which he was actively involved could not be dormant. La Liga Filipina is a group which is derived from La Solidaridad and the Propaganda Movement. When Jose Rizal got exiled in Dapitan the Organization La Liga Filipina became inactive and later on split into two, the conservative had formed the Cuerpo de Compromisarios and the Radical which is led by Andres Bonifacio had formed the secret group named the Katipunan. The La Liga Filipina would have still existed if Rizal was still n Manila because he would have continued his active participation as reformist to correct and reform the misadministration being conducted by the Spanish officials as well as the misdemeanor of friars in the Philippines. ) http://joserizal. info/Biography/man_and_martyr/chapter13. htm http://joserizal. info/Biography/man_and_martyr/chapter14. htm http://www. mb. com. ph/node/236170/hero-exile-remembered http://agham. asti. dost. gov. ph/1st/rizalnat. htm http://joserizal. info/Reflections/retraction. htm

Global Warming Report Essay

Over the past few decades scientist have been observing a warming trend in the over all temperature of the earth. Although the earth has been known to go through warm and cold periods, it seems that we humans are causing the earth to heat up this time. The greenhouse effect is causing the earth to go through this warming trend that we call global warming. The greenhouse effect is caused when the infrared radiation from the sun is absorbed in atmospheric gasses such as water vapor, carbon dioxide, ozone, and methane. All of these gasses escape slowly from the atmosphere, therefore the heat stays here longer in a short of warm airy blanket. Without the occurrence of the greenhouse effect scientist say that the earths average temperature would be around 30 degrees C. or 50 degrees F. There are many greenhouse gasses that can trap the infrared rays of the sun. Carbon dioxide can be released into the atmosphere in several ways, the bulk of it is produced by car exhaust, deforestation, and the burning of fossil fuels. It is a colorless, odorless, non flammable gas, and it is also the most prominent greenhouse gas in earths atmosphere. CO2 is recycled through the earths atmosphere using the process photosynthesis, which makes most life on earth possible. Another greenhouse gas is methane and it is one of the most common gasses in the universe. methane is colorless odorless gas that is lighter than air and is produced by organic decay. Deposits of methane can usually be found in areas where lots of natural decay takes place, such as swamps, and land fills. Each year we add 350-500 million tons of methane to the atmosphere through mining, raising livestock, rice cultivation, and landfills. In fact a cow can release up to a half pound of methane into the air everyday. Nitrous oxide is another colorless and greenhouse gas, however it does smell sweet. It is mostly used medically because it deadens pain, because of this it is called laughing gas. It is released naturally from oceans and by bacteria is soil. It is important to reduce our emissions because nitrous oxide we release today will still be trapped in the atmosphere 100 years from now. The set of greenhouse gasses are fluorocarbons, that is a general term for any group of synthetic organic compounds that have fluorine and carbon. These can be found in aerosol cans, refrigerators, and air conditioners. When fluorocarbons are released into the atmosphere they breakdown molecules of the earths ozone layer. The effects of global warming are also good for human beings, because it could increase food production. The most important factor in crop production is climate, and global warming would facilitate a better climate for the growth of more crops. It would also create much more space for businesses were there was once ice and harsh climate. Also without global warming the earth temperature would be about 30 degrees F. n average. With global warming there would be far fewer deaths from cold exposer. If global warming caused enough arctic melt then shippers would have many new shortcut routes to take from place to place. After glacier melt we would have access to many new mining areas. However global warming will also have some large negative effects. Such as health concerns, scientist predict that there will be ma ny more deaths from diseases that are irritated by heat, including heart attacks and heatstroke. Another downside to global warming is the amount of flooding that will occur with coastal cities. Scientist have predicted that about a sixth of the country will be under water after global warming has taken full effect. The Maldive Islands are a nation of 1190 islands that are home to over 200,000 people. These islands are only 1. 5 meters above sea level and if global warming occurs then all of those people will have to be relocated. There are many things that we as human beings can do to help prevent global warming from happening. We can start to take advantage of all the different types of renewable energy instead of burning fossil fuels that pollute the atmosphere in multiple ways. There are many types of clean, efficient, renewable energy sources. There are many energy sources that the earth has provided for us that we need to take advantage of. We need to build more wind turbines, hydro electric plants, and solar power plants. Another way of producing clean energy include using fission through nuclear power to create a clean renewable energy source. Government can also be doing there part by funding research about global warming and raising awareness about how individuals can be doing there part to reduce pollution. In conclusion, Global warming is a very serious thing, it can affect the orld in many different ways. We just need to decide which effects help or harm the world the most and then make an educated choice as to which ones the earth can handle while taking the least amount of stress, and having the best long term effect. ————————————————â €”———————————————————————————————————— Patrick Michaels, â€Å"The Satanic Gasses† Henry Willis, â€Å"Earths Future Climate† Fred Singer, â€Å"Hot Talk and Cold Science† Ronald Bailey, â€Å"Global Warming and Other Eco Myths†

Computer & Engineering Essay

How Individual information systems can improve personal productivity ( My Own Practice) Reading, writing, arithmetic, speaking, and listening are all considered basic skills. These skills are useful over a wide range of problems that people encounter. Now use of computer-based personal productivity tools is emerging as a new standard in education. My own skills improved and still growing with that strange hit and pick the keys of keyboard and the big different way to writing and do our thing without pencil or pen if I wont to draw my sketch ( Because I’m production engineer and how can make a report or set workers as list to describe the way to product. But I wont to set specific way and the main benefits from changing from pen to computer hit at key and I think it is the time for future systematic way to discuss our self by computerize way or systematic by set points and discuss productivity tools : My Process Writing: Many of the fundamental ideas regarding personal productivity tools can be illustrated using a word processor. It is likely that I have used a word processor; thus, a number of the ideas given here will be familiar with me. To begin, you know that there is a considerable difference between being able to use a writing tool–be it pencil and paper or a word processor–and being able to write [[effectively]]. The tool, by itself, does not make you into a writer. Writing is a process designed to produce a document that communicates a message. Typically, the production of a written product goes through several steps that, collectively, are known as process writing. 1. Conception of ideas and development of these ideas. This may involve brainstorming, doodling, making brief notes, and a lot of thinking. 2. Development of an initial draft. This involves getting the conceptualized ideas into words. 3. Obtaining and making use of feedback. Feedback from oneself and others is used to produce revised versions of the initial draft. Often this involves repeated cycling back to step 1 and/or 2. 4. Polishing the final draft for publication. This includes final cleanup on spelling and grammar. Nowadays, it often includes formatting the materials in a professional manner using desktop publishing techniques. Computers can play an important role in each of these four steps of process writing. While the first step may be primarily mental, there are a variety of pieces of software designed to aid in jotting down ideas and organizing these ideas. [[See specifically, software designed to aid in cognitive mapping or concept mapping.]] In addition, most modern word processors include an outliner. This makes it easy to get rough draft ideas into the machine and to reorganize them as needed. Revision is an important idea in problem solving as well. There are many problem-solving situations in which one can develop a proposed solution and then get feedback from oneself and others on the quality of the proposed solution. The feedback is then used in doing revisions to the proposed solution. The feedback and revision cycle continues until a satisfactory solution is obtained. Desktop publishing has become a major industry. All word-processing software contains provisions for producing a final document that is nicely laid out. Professionallevel desktop-publishing software contains a wide range of aids to produce professionallooking final products. Such documents often make use of graphics and color. They may be laid out in columns, make use of a range of type styles and sizes, and be designed to help convey their messages. A person can learn to keyboard in a hunt-and-peck mode with just a minute or so of instruction. Young children can learn such keyboarding more easily than they can learn to form letters using pencil and paper. Similarly, it takes only a few minutes of instruction to learn how to use a word processor in a hunt-and-peck mode. However, this low level of word-processor use is only a modest aid to productivity in writing. It is too slow and it does not take advantage of the powerful writing aids that are built into a modern word processor. Four things for a word processor to be a useful personal process writing aid: 1. Keyboarding skills. You need not be a touch typist, even though it is helpful. Many professional writers are not touch typists. They look at the keyboard and they use only a couple of fingers from each hand as they keyboard. However, they know where the keys are and they have considerable speed. The skills that they have developed are adequate to fit their needs. And I am good now at that speed to make the typing more easily. 2. Word-processing skills. For example, how do you do a cut and paste? How do you do a search and replace? How do you use a spell checker and a thesaurus? How do you create tables, alphabetize a list, or automate the production of an index and table of contents? The manual for a modern word processor may be many hundreds of pages in length. 3. Word processor-assisted writing skills. In essence, paper and pencil provide a linear writing environment where it is difficult to correct errors and even more difficult to make significant overall revisions to a document. Interchanging the order of two paragraphs requires recopying an entire page or more. The word- processing environment is different. It takes a lot of training and experience to unlearn some of the linear and restrictive writing habits that are required when working with pencil and paper, and to learn to take advantage of the power of a word processor. 4. Desktop publication knowledge and skills. Before the development of desktop publication, many people made a living in the design, layout, and typesetting of print materials. Both design and typesetting were skilled professions. Now, desktop publication tools have made the writer more and more responsible for design and â€Å"typesetting.† Generic Computer Productivity Tools We use the term generic tool to describe a software tool that is applicable over a wide range of different disciplines. The word processor and desktop-publishing tools discussed in the previous section are examples of generic tools. To make effective use of a generic tool, you need to know both the tool and the domain of application. You already have a reasonable level of expertise in many different domains. Thus, as you learn to use one of these generic tools, you will find that it is relatively easy to apply the tool to your areas of expertise. There are many software tools that might be considered generic. The following list has been arranged in alphabetical order and I am doing my work with that software tool because my work depend on it . Computer-assisted design (CAD). Notice how this computer application relates to spatial intelligence in the Howard Gardner list of multiple intelligences. CAD software is used to do architectural and engineering drawings of products that are to be constructed. A CAD system can be used in the design of all sorts of products. Such software is used in place of the ruler, compass, protractor, and other tools formerly used by the draftsperson. Database. A database is an organized collection of information, often specific to one particular topic. A telephone book is a database of names, addresses, and telephone numbers. A computerized database is much easier to edit (add entries, make corrections, delete entries) than a printed database. A computerized database is designed to make it easy to locate needed information. It is also designed to make it easy to sort information into a desired format or to prepare reports based on parts of the information. ï‚ · Desktop presentation (to university oral presentations). The overhead projector, filmstrip projector, movie projector, [[slide projector,]] tape recorder, and video projector have gradually merged into a computer-based system. Material to be presented is stored on computer disk in digital form and edited using the computer. The presenter then uses the desktop-presentation system interactively when making the oral presentation. Desktop publication. A computer system is used to store, edit, design, and lay out the materials that are to be published in printed form. Output may be to a printer, to film used to make plates to go on a printing press, or directly to a printing press. Graphics (paint and draw programs). A paint program has some of the characteristics of a set of painting tools, while a draw program has some of the characteristics of a set of drawing tools. Taken together, these tools can be used to accomplish a wide range of graphic artist tasks. The graphics that are produced can be used in a word-processing document, in desktop presentation, or in other types of computer applications. Graphing (for graphing data and functions). Numerical data is easily converted to a wide range of different types of graphs, such as bar graph, line graph, pie chart, and so on. Mathematical functions can be represented graphically. For example, a three-dimensional mathematical surface can be represented on the computer screen and then rotated to allow viewing from different perspectives. A lot of our project with university topics we do it by graphing. Groupware. This software combines telecommunications with personal productivity tools. It is designed to facilitate a group of people from different locations in working jointly, both simultaneously and individually, on a computer-based project. Increasingly, groupware will include provisions for the users to talk to each other and see each other as they work together. Hypermedia. A hypermedia document is designed to be used [[â€Å"read†]] interactively by a computer user. It may combine text, sound, graphics, color, and video in a nonlinear fashion. The nonlinearity and interactivity mean that â€Å"reading† a hypermedia document requires the use of a computer. Increasingly, our educational system is working to have students become â€Å"reading and writing† hypermedia literate. Math systems. There are a number of comprehensive software packages that can solve a huge range of math problems. Such software can solve the types of problems that students struggle over in algebra, calculus, and other math courses. The use of such software in these courses leads to a drastic change in the nature of the courses. And, of course, it leads to a drastic change in the ability of students to actually solve the types of problems they are studying in the courses. Spreadsheet. A spreadsheet is designed to aid in doing bookkeeping, accounting, and modeling of business problems. It can also be used in other computational situations in which one works with a table of numbers and formulas. A key feature is that the computer system can automatically rework all of the computations represented in the table whenever you make a change to any of the numbers or formulas. Telecommunications [(for communication among people, information, and machines)]]. Telecommunications is the electronic link between people, computers, and other machines. This may be via a local area network, perhaps just connecting people, computers, and machines that are all in one building. It may also be a worldwide connection, using local and long distance telephone lines, satellites, microwave systems, and fiber optics. Intelligent, digital connectivity is having a major impact on the societies and people of our planet. Word processor. A word processor is software designed to aid in writing. A modern word processor contains a number of features, such as a spell checker, thesaurus, graphics, and graphing, that may be of use to a writer. There is no clear dividing line between a word processor and desktop-publishing software. Although a generic computer-based personal productivity tool can be used in many different disciplines, each tool is oriented towards representing and solving certain somewhat specific types of problems. With me all that thing above change my way to solving problems and I try to make it more easily for me and update my experiences with the latest version of that software or methods .