Miyerkules, Mayo 25, 2011

case study

http://www.epa.gov/dfe/pubs/pwb/case_stu/case6/index.html



Case Study 6: Pollution Prevention Beyond Regulated Materials

Printed Wiring Board
green line
    The most successful pollution prevention programs involve looking for opportunities "beyond the barrels." While pollution prevention most commonly takes the form of chemical use and waste reduction, by maintaining a chemical-specific focus you may overlook less obvious opportunities, such as in energy and water conservation. For one facility, Tri-Star Technologies, Inc. in Methuen, Massachusetts, broadening their view of pollution prevention led them to energy and water use reductions that have resulted in significant cost savings. These energy and water reduction projects are the focus of this case study.

    Getting Started

    green line Tri-Star Technologies, Inc. is a manufacturer of double-sided and multilayer printed wiring boards, specializing in products for the electronics industry. With 220 employees at their 120,000 ft2 facility, they produce 1,000,000 surface square feet annually. As Tri-Star implemented their pollution prevention program, this company discovered that demonstrating cost savings is the key to a successful pollution prevention program, especially when first getting started or when jump starting a slow-moving program. Initially, Tri-Star implemented a few projects that did not require much, if any, capital investment. When it was able to show that cost savings achieved from these projects, the credibility of pollution prevention as a good business practice grew. Today, with several successes to their credit (both from an economic and a waste reduction standpoint), Tri-Star's pollution prevention team is able to obtain funding for projects that do require larger capital investments. These projects also offer increased cost savings in the long term. For example, the facility is currently installing a cupric chloride regeneration system to recycle their inner-layer etchant (see DfE Printed Wiring Board Case Study 2 for more information on etchant regeneration). Such a system might require a capital investment of $150,000 or more, but the payback is expected to be less than 18 months through dramatic reductions in spent (hazardous) etchant and virgin chemical purchases, and by selling the recovered copper by-product. Requiring a significant investment, this project has come about only after the pollution prevention concept gained credibility through the success of "low tech/no tech" projects. By looking beyond regulated materials, Tri-Star found cost saving opportunities in energy and water conservation. Such opportunities are a "cheap, easy, and often overlooked way to reduce your facility's environmental impact while saving money," says Ed Gomes, environmental Health and Safety Manager for the facility. Energy reductions can lead to reductions in the by-products of energy use that cause global warming, acid rain, and smog -- this is pollution prevention on a global scale. While not all of their projects are directly transferable to every facility, other manufacturers could use the information gained from Tri-Star's experience to examine their own energy and water use.

    Utilizing the Utilities

    green line Tri-Star has implemented several energy conservation projects. The two projects described in this case study both involved collaborative efforts with the electric and/or gas companies. Together, these two projects have resulted in savings of thousands dollars per month, or about $51,800 annually. green diamondBalancing air flow saved energy Tri-Star's first energy conservation opportunity was identified in their fixed flow-rate air make-up units. The facility has several pieces of equipment exhausting air, including wet scrubbers and an electrostatic precipitator. To balance the air flow, they had been using two gas-fired air make-up units, each with a capacity of 40,000 cubic feet per minute (cpm). Since these operated at a fixed rate, they were on continuously, even during non-production hours. In addition to the operating energy they consumed, the units also required the air conditioning or heating systems to work overtime. In the summer, the units blew hot, humid air into the facility. In the winter, the units heated the air blown in. This resulted in a concentrated heat source that caused great temperature inconsistencies throughout the building, with the hot air in some areas shutting down the thermostats, making the cold areas even colder. Working with the gas and electric companies, Tri-Star found state-of-the-art variable speed controllers that could be retrofitted to the make-up air units. With the variable speed controllers, the flow rate is determined based on the air exhaust rate from the exhausting equipment. Significant savings in electric and gas bills were realized. A unique feature of this project is that it required no capital investment; the electric and gas company paid for the new equipment. The facility estimates annual savings to be $22,900 on gas and $15,600 on electricity. Additionally, the project reduced air pollution through energy savings of 31,000 therms and 192,800 kilowatt-hours (KWH). This translates to annual reductions of:
    • CO2 (global warming) of 212,100 pounds;
    • SO2 (acid rain) of 1,700 pounds; and
    • NOx (acid rain & smog) of 600 pounds.
    green diamondReplacing compressors improved efficiency In another energy conservation project, Tri-Star examined their compressed air situation. They had been using two 100 HP and two 50 HP compressors to provide the facility with compressed air. These units had some trouble meeting the compressed air demand. With help from the "Energy Initiative" program run by the electric company (Mass Electric) and input from a consultant, the facility investigated its compressor situation. Based on the results of theresults Tri-Star: green checkadded a reserve air tank green checkreplaced the four compressors of 300 HP combined capacity with three 50 HP energy efficient compressors (150 HP combined capacity) green checkset up the units to cycle based on the compressed air demand in the facility These changes have saved energy and eliminated the problems in meeting the facility demand for compressed air. Annual energy cost savings from this project are estimated to be $13,300, based on a 164,800 KWH reduction in electricity use. This translates to annual reductions of:
    • CO2 (global warming) of 181,300 pounds;
    • SO2 (acid rain) of 1,500 pounds; and
    • NOx (acid rain & smog) of 500 pounds.
    These energy use reduction projects have improved plant operations, saved money, and reduced virgin oil consumption, waste oil (hazardous waste) generation, and air pollution to the community.
    Diagram showing energy savings from Tri-Star projects

    Conserving Water Pays Off

    green line Water conservation has been another focus area of Tri-Star's pollutionprevention efforts that goes beyond regulated materials. green diamondUsing DI water avoided chemical cleaners When Tri-Star expanded their fabrication business to add assembly operations, they considered the different types of systems they could use to clean flux residue from the wave solder unit. They looked into the options available in vapor degreasing or semi-aqueous cleaning. With further investigation, however, they discovered that hot deionized (DI) water could clean the boards just as effectively as the chemical-based cleaning systems. Then Tri-Star went one step further and purchased a closed-loop DI water generation system that delivers 5 to 7 gallons per minute (gpm). The system both generates DI water and recycles it through the cleaning process in a closed-loop system. One problem Tri-Star initially experienced with the system was that solder paste was degrading the system's resin columns. In normal production this is not an issue; however, when a board requires rework, the operator runs it through the closed-loop cleaning system to remove the solder paste before reapplication. To avoid this problem, Tri-Star installed a sink on the side cleaning unit where the operator could manually clean the reject boards with the hot DI water instead of placing them on the system conveyor. The effluent from the sink is plumbed through a filter and directly to waste treatment. With this simple installation, the solder mask from the rejected boards never enters the closed-loop system, extending the life of the system's resin columns. Because this closed-loop system was installed for a new operation, benefits compared to other technologies could not be quantified. Compared to other flux residue cleaning systems, the qualitative benefits are that it:
    • conserves water;
    • does not use solvents; and
    • does not use any chemicals.
    green diamondSmarter rinsing reduced water use by 79% In another water conservation project, Tri-Star installed flow controls on rinses, increased counterflow rinsing, and implemented other "smart rinsing" techniques on their electroless copper line. By re-counting rinse water from one set of counterflow rinse tanks to another, Tri-Star cut the incoming water sources from seven to four, and reduced their water usage on the line from 19 gpm to 4 gpm, as shown in the chart below.
    Diagram of Electroless copper line
    Although Tri-Star made these changes on the deposition line, these water use reduction ideas may be applied to other processes that use multiple rinses. To make these changes in any process, cross contamination issues must be carefully considered. To design the rinse water reuse for this line, Tri-Star set up criteria, flagging the following as "Do not contaminate" items: Do not contaminate: green checkelectroless copper bath with palladium from the catalyst green checkcatalyst with cleaner/conditioner green checkaccelerator with electroless copper green checkelectroless copper with microetch or acids green checkmicroetch with cleaner/conditioner In addition to water savings, these changes also reduced the amount of chemicals needed to maintain the process baths. With the "smart rinsing" water rinse set-up, the chemistry is eventually dragged back into the tank from which it was dragged out (i.e., rinse water flows back and becomes the rinse of the previous step). This has reduced the chemicals needed for additions by 25% for the affected baths (glass etch, microetch, sulfuric acid dip, and accelerator). Overall, Tri-Star estimates that "smart rinsing" has reduced their water usage by 2.5 million gallons per year, resulting in cost savings of approximately $15,000. This is based on operating the electroless copper line for 12 to 16 hours per day, 5 days per week. The combined water and sewer fees in their area are $4.69/100 ft3 (or $6.26/1,000 gal). Additionally, they saved on chemical purchases resulting from reduced chemical use.

    What is the Design for the Environment (DfE) Printed Wiring Board Project?

    green line Representatives of the printed wiring board industry and other stakeholders entered into a partnership with the U.S. Environmental Protection Agency (EPA), called the Design for the Environment (DfE) Printed Wiring Board Project. This project is a cooperative, non-regulatory effort in which EPA, industry, and other interested parties are working together to develop technical information on pollution prevention technologies specific to the PWB industry. This information includes comparative data on the risk, performance, and cost of alternative manufacturing options. To date, the DfE Project has focused on conducting a comprehensive evaluation of alternative technologies for making through-holes conductive. The Project is also beginning to evaluate alternatives to the hot-air-solder-leveling process. By publishing the results of these evaluations, DfE is able to provide PWB manufacturers with the information they need to make informed business decisions that take human health and environmental risk into consideration, in addition to performance and cost. The Project is also identifying and publicizing other pollution prevention opportunities in the industry through the development of PWB case studies, like this one.

    Acknowledgements

    green line EPA's Design for the Environment Program would like to thank Power Circuits for participating in this case study, and DfE PWB Project participants from the following organizations, who provided advice and guidance: Circuit Center, Inc., Concurrent Technologies Corp., DuPont Electronic Materials, Electrotek Corp., Hadco Corp., H-R Industries, Inc., and IPC.

    Additional Pollution Prevention Resources for the PWB Industry

    green line EPA's Design for the Environment Program would like to thank Tri-Star Technologies, Inc. for participating in this case study, along with the DfE PWB Project participants from the following organization who provided advice and guidance: Circuit Center, Inc., Concurrent Technologies Corp., Hadco Corp., and the Institute for Interconnecting and Packaging Electronic Circuits. Additional Pollution Prevention Resources for the PWB Industry In addition to this case study, the DfE PWB Project has prepared other case studies that examine pollution prevention opportunities for the PWB industry. All case studies are based on the experiences and successes of facilities in implementing pollution prevention projects. The other case study topics available include: Pollution Prevention Work Practices On-site Etchant Regeneration Acid Recovery and Management Plasma Desmear A Continuous-flow System for Reusing Microetchant

Historical events in World War II

World War II in Europe

Poles walk among the ruins of besieged Warsaw.
Poles walk among the ruins of besieged Warsaw.
— USHMM, courtesy of Julien Bryan
Hitler's government envisioned a vast, new empire of "living space" (Lebensraum) in eastern Europe. The realization of German dominance in Europe, its leaders calculated, would require war.
1939
After securing the neutrality of the Soviet Union (through the August 1939 German-Soviet Pact of nonaggression), Germany started World War II by invading Poland on September 1, 1939. Britain and France responded by declaring war on Germany on September 3. Within a month, Poland was defeated by a combination of German and Soviet forces and was partitioned between Nazi Germany and the Soviet Union.
1940
The relative lull in fighting which followed the defeat of Poland ended on April 9, 1940, when German forces invaded Norway and Denmark. On May 10, 1940, Germany began its assault on western Europe by invading the Low Countries (Netherlands, Belgium, and Luxembourg), which had taken neutral positions in the war, as well as France. On June 22, 1940, France signed an armistice with Germany, which provided for the German occupation of the northern half of the country and permitted the establishment of a collaborationist regime in the south with its seat in the city of Vichy.
With German encouragement, the Soviet Union occupied the Baltic states in June 1940 and formally annexed them in August 1940. Italy, a member of the Axis (countries allied with Germany), joined the war on June 10, 1940. From July 10 to October 31, 1940, the Nazis waged, and ultimately lost, an air war over England, known as the Battle of Britain.
1941
After securing the Balkan region by invading Yugoslavia and Greece on April 6, 1941, the Germans and their allies invaded the Soviet Union on June 22, 1941, in direct violation of the German-Soviet Pact. In June and July 1941, the Germans also occupied the Baltic states. Soviet leader Joseph Stalin then became a major wartime Allied leader, in opposition to Nazi Germany and its Axis allies. During the summer and autumn of 1941, German troops advanced deep into the Soviet Union, but stiffening Red Army resistance prevented the Germans from capturing the key cities of Leningrad and Moscow. On December 6, 1941, Soviet troops launched a significant counteroffensive that drove German forces permanently from the outskirts of Moscow. One day later, on December 7, 1941, Japan (one of the Axis powers) bombed Pearl Harbor, Hawaii. The United States immediately declared war on Japan. On December 11, Germany and Italy declared war on the United States as the military conflict widened.
1942-1943
In May 1942, the British Royal Air Force carried out a raid on the German city of Cologne with a thousand bombers, for the first time bringing war home to Germany. For the next three years, Allied air forces systematically bombed industrial plants and cities all over the Reich, reducing much of urban Germany to rubble by 1945. In late 1942 and early 1943, the Allied forces achieved a series of significant military triumphs in North Africa. The failure of French armed forces to prevent Allied occupation of Morocco and Algeria triggered a German occupation of collaborationist Vichy France on November 11, 1942. Axis military units in Africa, approximately 150,000 troops in all, surrendered in May 1943.
On the eastern front, during the summer of 1942, the Germans and their Axis allies renewed their offensive in the Soviet Union, aiming to capture Stalingrad on the Volga River, as well as the city of Baku and the Caucasian oil fields. The German offensive stalled on both fronts in the late summer of 1942. In November, Soviet troops launched a counteroffensive at Stalingrad and on February 2, 1943, the German Sixth Army surrendered to the Soviets. The Germans mounted one more offensive at Kursk in July 1943, the biggest tank battle in history, but Soviet troops blunted the attack and assumed a military predominance that they would not again relinquish during the course of the war.
In July 1943, the Allies landed in Sicily and in September went ashore on the Italian mainland. After the Italian Fascist Party's Grand Council deposed Italian premier Benito Mussolini (an ally of Hitler), the Italian military took over and negotiated a surrender to Anglo-American forces on September 8. German troops stationed in Italy seized control of the northern half of the peninsula, and continued to resist. Mussolini, who had been arrested by Italian military authorities, was rescued by German SS commandos in September and established (under German supervision) a neo-Fascist puppet regime in northern Italy. German troops continued to hold northern Italy until surrendering on May 2, 1945.
1944
On June 6, 1944 (D-Day), as part of a massive military operation, over 150,000 Allied soldiers landed in France, which was liberated by the end of August. On September 11, 1944, the first U.S. troops crossed into Germany, one month after Soviet troops crossed the eastern border. In mid-December the Germans launched an unsuccessful counterattack in Belgium and northern France, known as the Battle of the Bulge. Allied air forces attacked Nazi industrial plants, such as the one at the Auschwitz camp (though the gas chambers were never targeted).
1945
The Soviets began an offensive on January 12, 1945, liberating western Poland and forcing Hungary (an Axis ally) to surrender. In mid-February 1945, the Allies bombed the German city of Dresden, killing approximately 35,000 civilians. American troops crossed the Rhine River on March 7, 1945. A final Soviet offensive on April 16, 1945, enabled Soviet forces to encircle the German capital, Berlin. As Soviet troops fought their way towards the Reich Chancellery, Hitler committed suicide on April 30, 1945. On May 7, 1945, Germany surrendered unconditionally to the Western Allies at Reims and on May 9 to the Soviets in Berlin. In August, the war in the Pacific ended soon after the U.S. dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki, killing 120,000 civilians. Japan formally surrendered on September 2.
World War II resulted in an estimated 55 million deaths worldwide. It was the largest and most destructive conflict in history.

Article...Important Events in the Philippine

Important Events in Philippine History


The rugged coastline of BatanesA garden resort in TagaytayLaiya BeachMotorbiking in Mindoro Part2Touring the hills of Palangan

 or go to the photo album 
The Spanish Regime
March 17, 1521. Ferdinand Magellan, a Portuguese navigator accidentally landed in the island of Samar.
March 31, 1521. The first Catholic mass was held in Limasawa, an island in the south of Leyte.
April 27, 1521. Magellan died in the hands of a chieftain, Lapu-lapu, from his strong will to invade the island of Mactan.
February 13 1565. Another group of explorers headed by General Miguel Lopez de Legazpi, arrived in Cebu and insisted their claim for the island.
June 3, 1571. After defeating Raja Sulayman in a battle in Bangkusay, Martin de Goiti claimed autonomy of Manila.
June 24, 1571. Legazpi established Manila as the capital city with himself as Governor-General.
April 14, 1617. The Spanish fleet headed by Juan Ronquillo prevented the British attempt to invade Manila in the battle of Playa-Homda.
October 3, 1646. For the second time, the Spanish fleet defeated the British warship in Manila Bay. This event is commemorated in a yearly feast called " La Naval de Manila".
October 5, 1762. The British fleet defeated the Spanish warship allowing the British rule the country for two years.
March 17, 1764. The British surrendered the country to Spain after losing a battle during the seven-year war between them.
October 31, 1829. Francisco Dagohoy, a cabeza de barangay of Bohol and the leader of the longest uprising (8 years), surrendered to the Spaniards.
September 6, 1834. Manila was opened to international trade leading to a remarkable transformation of its economy.
February 15, 1889. The establishment of La Solidaridad, the newspaper founded by Graciano Lopez Jaena to voice out the Filipinos cry for reforms.
September 18, 1891. Jose Rizal finished his novel El Filibusterismo following the first, Noli Me Tangere. Both portrayed the struggling life of the Filipinos under the Spanish rule.
July 3, 1892. Jose Rizal established La Liga Filipina, a civic movement aimed at reuniting Filipinos to act together for reforms and autonomy from the unjust administration of the Spaniards.
July 7, 1892. Jose Rizal was captured and exiled to Dapitan in Mindanao. There he served as a doctor, a scientist and a teacher to the locals.
July 7, 1892. At the same day of Rizal’s capture, Andres Bonifacio, Teodoro Plata and Valentin Diaz established the "Katipunan", a revolutionary movement aimed to fight for freedom against Spain.
August 19, 1896. The Spaniards learned the Katipunan movement that resulted to a massive capture of many Filipinos.
August 23, 1896. Bonifacio and his fellow Katipuneros tore their cedulas or residence certificates while shouting "Long live the Philippines", during their preparation for battle. This was marked as the historic Cry of Balintawak.
August 25, 1896. The Katipuneros headed by Bonifacio had their first encounter with the Spanish civil guards and infantrymen. Due to strong forces and large presence of the Filipino troops, both camps of the Spaniards retreated. But in the end, Filipinos lost the battle when the latter came back with large number of fighters and stronger ammunition.
Setember 12, 1896. A group of revolutionaries from Cavite were executed. They are now known as teh "Trece Martires de Cavite" or the thirteen martyrs of Cavite.
December 30, 1896. Jose Rizal was executed by firing squad in Bagumbayan (now called Rizal Park) after being held captive at fort Santiago in Intramuros, Manila.
March 22, 1897. The Katipuneros elected a new set of officers to replace the Katipunan. This was held in Tejeros, San Francisco de Malabon and was called the Tejeros Convention. Bonifacio diisolved the convention after Daniel Tirona, an associate of Emilio Aguinaldo, questioned his professional credibility as the director of the interior without a Lawyer’s diploma. Aguinaldo’s group won and considered Bonifacio and his men enemies of the revolution.
May 10, 1897. Andres Bonifacio and his brother Procopio were excuted in Mt. Tala, Cavite after an unjust trial headed by General. Mariano Noriel, an associate of Emilio Aguinaldo.
April 23, 1897. A new Spanish Governor named Fernando Primo de Rivera arrived in Manila for the purpose of minimizing the thriving rebellion of the Filipinos. He issued a decree to grant pardon to those who would surrender to the Spanish government.
December 15, 1897. Primo de Rivera and Pedro Paterno signed the Truce of Biak-na-Bato allowing a temporary ceasefire between the Spanish and the Filipinos.
December 27, 1897. Aguinaldo and his associates voluntarily moved to Hongkong for the amount of P800,000.
January 20, 1898. Periodic battles between the Filipinos and the Spaniards erupted due to mutual suspicion. General Francisco Makabulos of Tarlac established a provisional goverment. The arrest and imprisonment of suspected rebels continued and despite the Truce, the revolution persisted.
American Occupation
February 14, 1898. The Spaniards bombed the American fleet "Maine" in Havana, Cuba killing 246 people.
April 25, 1898. The United States declared war against Spain ordering Commodore George Dewy to attack the spanish fleet in the Philippines.
May 1, 1898. Manila Bay turned into a massive battle field between United States and Spain. The Americans defeated the Spanish fleet led by Admiral Patricio Montojo.
June 12, 1898. General Emilio Aguinaldo, who had returned from Hongkong, proclaimed Philippine independence at his mansion in Kawit, Cavite.
August 13, 1898. A mock battle between the Spanish and the Americans occured forbidding the participation of Filipino soldiers. Later, Manila was surrendered by Spain to the United States.
December 10, 1898. Without the knowledge of the Filipinos, Spain surrendered the Philippines (along with Puerto Rico and Guam) to the United States in exchange of $20 million under the Treaty of Paris.
January 23, 1899. General Emilio Aguinaldo was sworn into office as the president of the Philippine Republic and at the same time promulgated The Malolos Constitution.
June 5, 1899. General Antonio Luna was killed by soldiers from the Kawit Company in Cabanatuan, Nueva Ecija.
December 2, 1900. The young general, Gregorio del Pilar died while fighting against the Americans in the Battle of Pasong Tirad (Tirad Pass).
March 23, 1901. Emilio Aguinaldo was captured by the Americans headed by Col. Frederick Funston with the help of some Filipinos in Palanan, Isabela.
October 16, 1907. The first Philippine Assembly was inaugurated at Manila Grand Opera House. Sergio Osmena was elected as speaker and Manuel L. quezon as Majority Floor Leader.
Occtober 13, 1913. The Underwood-Simons Law took effect, allowing an open trade between the United States and the Philippines.
August 29,1916. The Jones Law was signed allowing the existence of the Philippine Legislature and promising the Philippine independence from the United States.
August 26, 1930. Crisanto Evangelista established the Communist Party of the Philippines or CPP as a peasant’s rebel movement and was later joined by farmers and even professionals.
December 7, 1933. Frank Murphy, the last American Governor, granted Philippine women the right to vote.
March 24, 1934. President Franklin Roosevelt signed the Tydings McDuffie Act as to allow the drafting of the Philippine Constitution and to establish the Philippine Commonwealth, an agreement to liberate the Philippines in ten years.
March 23, 1935. Pres. Roosevelt approved the plebiscite on the constitution for the new Republic. Claro M. Recto presided the Philippine Constitution, which was mainly patterned after the American Constitution, over the Constitutional Convention.
September 18, 1935. Manuel L. Quezon was elected President of the Commonwealth and Sergio Osmena as the Vice President.
World War II and the Japanese Occupation
December 7, 1941. The Japanese bombed the Pearl Harbor, a US military base in Hawaii. The Philippines wa attacked ten hours after the bombing.
December 25 1941. General Douglas MacArthur declared Manila as an "open city" but the Japanese ignored and still continued its attack.
March 29, 1942. Luis Taruc established the anti-Japanese guerilla movement HUKBALAHAP ( Hukbo ng Bayan Laban sa Hapon).
April 9, 1942. On this day, the "Fall of Bataan" and the infamous "Death March" took place. Around 76,000 starving Americans and Filipino soldiers surrendered to the Japanese in Bataan. The Japanese led their captives on a cruel hike from Mariveles, Bataan to Camp O’donnell in Capas, Tarlac. Around 7,000 to 10,000 men perished from starvation during the ten-day march while some were luckily pulled out secretly by watching civilians.
May 6, 1942. Corregidor, the last U.S. Defense Base of Filipino-American troops under Jonathan Wainwright, fell under Commander Homma of the Japanese Imperial Forces.
October 24, 1944. This day the prominent battle of Leyte Gulf took place, where the island of Leyte was filled massively with an amphibious force of 700 vessels and 174,000 army and navy servicemen. By December 1944, the islands of Leyte and Mindoro had been cleared of the Japanese.
September 2, 1945. Right after the war in the Pacific, Japan surrendered to the Americans. The Philippines later was granted its independence but with over a million Filipino casualties. More than 60,000 Americans died and 300,000 Japanese lost their lives.
The Philippine Republic
April 30, 1946. The Tydings Rehabilitation Act was signed, giving the Americans equal freedom and previlige to use the natural resources of the Philippines.
July 4, 1946. Manuel Roxas became the first President of the Philippine Republic.
March 14, 1947. The Treaty of General Relations was signed, allowing the US Military Bases to be installed in the Philippines for 99 years.
April 17, 1948. Elpidio Quirino suceeded Manuel Roxas as the president when the latter died of heart attack. Alarmed by the growing armed members of Hukbalahap Movement, Quirino tried to negotiate with its leader Luis Taruc.
November 10, 1953. Ramon Magsaysay was elected the new President and Carlos P. Garcia as Vice President. Known to be the leader of the poor, Magsaysay, initiated many local infrastracture projects and established special courts to resolve disputes between landlords and tenants.
May 17, 1954. Hukbalahap leader Luis Taruc surrendered to the government, signalling the decline of the movements threat.
March 17, 1957. President Ramon Magsaysay died in an airplane crash in Manunggal, Cebu.
November 11, 1961. Diosdado Macapagal won the presidential election and replaced President Carlos P. Garcia.
May 12, 1962. Soon after taking office, President Macapagal proclaimed June 12 as a national holiday in commemoration of Philipine Independence instead of July 4. General Emilio Aguinaldo, who first proclaimed Philippine independence in 1898, was the Guest of Honor at the first celebration of of Philippine Independence on June 12, 1962.
August 8, 1963. President Macapagal signed the Agricultural Land Reform Code.
November 9, 1965. Ferdinand Marcos was elected the 6th president of the Philippine Republic. He made extravagant spendings on public works, building roads, bridges, health centers, hospitals, schools and putting up urban beautification projects.
August 8, 1967. The Association of Southeast Asian Nation (ASEAN) was organized after a meeting in Manila.
December 26, 1968. Jose Maria Sison reestablished the Communist Party of the Philippines (CPP) as a Stalinist-Maoist Political Party.
November 11, 1969. Marcos was re-elected as president.
June 1, 1971. a bomb exploded at Plaza Miranda during a political rally of the Liberal Party. There were around 100 casualties and 10 deaths. Starting that time, the popularity of Benigno Aquino and his Liberal Party grew rapidly. Marcos blamed the communists for suspicious bombing.
September 21, 1972. Marcos declared martial law under the proclamation No. 1801. Many opposition leaders including Benigno Aquino, journalists and activists were detained in Fort Bonifacio under martial law.
http://www.camperspoint.com/spip.php?article259

My Authobiography

                I’m Preciousa G. Manabat, residing at Brgy. Villa Joson, San Jose City. I was born on December 14, 1991. I’m 19 years of age. My parents are Mr. Primo Manabat and Mrs. Encarnacion Manabat. I have one older brother named Gilbert Manabat and one younger brother, Prime Ivan Manabat.

                I took my elementary days at Parilla Elementary School located at Brgy. Villa Joson. Proudly to say, I am consistent honor student till I graduate having the award for being the 3rd honourable mention in our batch. Because of the scholarship that was offered by the San Jose Christian Colleges, I took my high school life in this school. This was the most embarrassing moment for me. I met lots of friends where in they become my inspirations and my strength during my down falls. As students, I cannot deny the fact that high school life gave me a lot of frustrations.

                During my High School days I want to become a Teacher it is because I want to inspire my Students and see that I contribute something in their success. When I finished my career in high school, I decided to enter college in Central Luzon State University (CLSU), as of now, I’m third year student, taking up Bachelor of Secondary Education Major in Social Studies. If I will finish my bachelor degree, I want to contribute my knowledge and skills to my future students, and build better students someday base on my own strategy of teaching.