My understandings of Canada and America
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Canada is a country occupying most of northern North America, extending from the Atlantic Ocean in the east to the Pacific Ocean in the west and northward into the Arctic Ocean. It is the world's cond largest country by total area. Canada's common border with the United States to the south and northwest is the longest in the world.The land occupied by Canada was inhabited for millennia by various groups of Aboriginal people. Beginning in the late 15th century, British and French expeditions explored, and later ttled, along the Atlantic coast. France ceded nearly all of its colonies in North America in 1763 after the Seven Years' War. In 1867, with the union of three British North American colonies through Confederation, Canada was formed as a federal dominion of four provinces. This began an accretion of provinces and territories and a process of increasing autonomy from the United Kingdom. This widening autonomy was highlighted by the Statute of Westminster of 1931 and culminated in the Canada Act of 1982, which vered the vestiges of legal dependence on the British parliament.
A federation consisting of ten provinces and three territories, Canada is governed as a parliamentary democracy and a constitutional monarchy with Queen Elizabeth II as its head of state. It is a bilingual nation with both English and French as official languages at the federal level. One of the world's highly developed countries, Canada has a diversified economy that is reliant upon its abundant natural resources and upon trade—particularly with the United States, with which Canada has had a long and complex relationship. It is a member of the G8, G-20, NATO, OECD, WTO, Commonwealth, Francophonie, OAS, APEC, and UN.
The Western USA interconnection (Pacific Intertie) The AC/DC Pacific Intertie is the largest single electricity transmission program in the United States. 拘留所
For over 30 years, electricity consumers on the US West Coast have benefited from a power link that allows large amounts of power to be transmitted between the Pacific Northwest and the Southwest. The high-voltage transmission lines that make this power-sharing possible collectively are called the Pacific Intertie. The Intertie includes three AC l
ines and one HVDC line. Together, they compri the largest single electricity transmission program in the United States. The Intertie is capable of transmitting up to 7,900 MW - 4,800 on AC and 3,100 on DC.
羊英语怎么说 Becau large amounts of Northwest hydro power can be transmitted reliably to the Southwest, less power has been generated at fossil-fuel power plants - an important benefit in a part of the country with air pollution problems. Converly, becau the Northwest has been able to import power from California, particularly overnight when demand is low, water can be rerved in rervoirs that otherwi would be ud to make electricity. From time to time the power has also been going northwards when the Northwest has been lacking hydro power.The initial Intertie consisted of two 500 kV AC lines and one ±400 kV DC line linking Oregon with Los Angeles. The northern end of the DC line is at the Bonneville Power Administration’s Celilo Converter Station, which is just south of The Dalles Dam about 90 miles east of Portland. The southern end is 846 miles (1361 km) away at the Sylmar Converter Station on the northern outskirts of Los Angeles. That station is operated by utilities including the Los Angeles Department of Water and P图书海报
ower (LADWP) and Southern California Edison.
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The northern end of the AC Intertie is at the John Day Substation, 30 miles (48 km) east of the DC terminal Celilo. Two AC lines run south from John Day to Lugo, east of Los Angeles. The lines went into rvice in 1968 and 1969, at a combined total capacity of 2,500 MW. A third line from The Dalles Dam to Tesla, east of San Francisco, was completed in 1993 and brought the total AC capacity to 4,800 MW.
To maximize the power transfer over the AC-lines veral ries capacitor (SC) installations have been built along the route. At the turn of the millennium veral of the are being upgraded by ABB, under a contract with Pacific Gas&Electric (PG&E). The main reason for the upgrade is the need to enable more power transfer, but other factors considered are the age of the equipment (some is from the 1960's), parts availability, capacitor cans containing PCB and too frequent mal-operations of old ries capacitor protection equipment. When the SC upgrade program is completed some years into the 21:st century, the maximum current carrying capability over the Intertie AC lines has been
raid from 1,800 Amperes to 2,700 Amperes. The HVDC line was energid in 1970 at 1,440 MW. It was upgraded to ±500 kV and 2,000 MW in 1985, and to 3,100 in 1989.The first thing you will notice about college is that it is much different than high school. You have more freedom and more opportunities, indicating that you must make important decisions yourlf. At day one you are alone. Even if you know other students at the university, you are one in thousands. Becoming someone of importance is challenging, and at times can be very intimidating. Understanding the changes from high school to college will give you a head start.
The differences between high school and colledge:
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One of the biggest differences between high school and college is that in college every decision is yours to make. Your parents are not there to remind you to do your homework. You are now allowed to choo what class you want to take and when tho class will be.The Benefit: If you have ever felt trapped while in high school, becau you were u
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nable to make decisions for yourlf. Now is the time to prove to everyone that you know what is best for you. In college you are t free, and if you let your ambitions guide you, you can go places and do things that you never imagined.The Negatives: For many students, freedom is the one thing that destroys them. If you have the freedom to do great things, you also have the freedom to make poor decisions.My favorite freedom that I gained by graduating from high school was no longer needing to ask to u the restroom! I hated asking a student teacher, still in college and only a few years older than me, if I could u the restroom.
