Autumn Autumn, interchangeably known as fall in the US and Canada, is one of the four temperate seasons. Autumn marks the transition from summer into winter, in September (Northern Hemisphere) or March (Southern Hemisphere) when the arrival of night becomes noticeably earlier and the temperature cools. One of its main features is the shedding of leaves from deciduous trees as they pave way for further growth. The equinoxes might be expected to be in the middle of their respective seasons, but temperature lag (caused by the thermal latency of the ground and sea) means that seasons appear later than dates calculated from a purely astronomical perspective. In North America, autumn is usually considered to start with the September equinox. In traditional East Asian solar term, autumn starts on or around 8 August and ends on about 7 November. Etymology Autumn in suburban Canterbury, Victoria, Australia The alternative word fall for the season traces its origins to old Germanic languages.
Engineering The American Engineers' Council for Professional Development (ECPD, the predecessor of ABET) has defined "engineering" as: The creative application of scientific principles to design or develop structures, machines, apparatus, or manufacturing processes, or works utilizing them singly or in combination; or to construct or operate the same with full cognizance of their design; or to forecast their behavior under specific operating conditions; all as respects an intended function, economics of operation or safety to life and property. One who practices engineering is called an engineer, and those licensed to do so may have more formal designations such as Professional Engineer, Designated Engineering Representative, Chartered Engineer, Incorporated Engineer, Ingenieur or European Engineer. History Engineering has existed since ancient times as humans devised fundamental inventions such as the pulley, lever, and wheel. Ancient era Renaissance era Modern era
Piezoelectric Energy Harvesting Brenda Ou December 10, 2011 Submitted as coursework for PH240, Stanford University, Fall 2011 Introduction The search for a clean, reusable source of energy has caused a spike in interest in the exploration of piezoelectricity. Piezoelectricity takes advantage of the charges in a piezoelectric crystal (such as quartz). Currently, smaller projects have been exploring new applications for piezoelectric energy. Piezoelectricity Piezoelectric materials are used to obtain energy from exerted forces or vibrations. Current Uses In 1989, LA times released an article: "Piezo: Tough Plastic With a Sensitive Side : Technology: A high-tech super-polymer is tough, clear, able to withstand harsh environments--and it can sing." Research Projects Another project in Japan attempts to fully utilize the power of human movement. Conclusion The use of piezoelectricity for sensors is widely accepted; however, doubt still remains concerning its efficiency as a direct source of energy. © Brenda Ou. References  J.
Erratic Phenomena power electricity Easter The last week of Lent is called Holy Week, and it contains the days of the Easter Triduum, including Maundy Thursday (also known as Holy Thursday), commemorating the Last Supper and its preceding foot washing, as well as Good Friday, commemorating the crucifixion and death of Jesus. Easter is followed by a fifty-day period called Eastertide, or the Easter Season, ending with Pentecost Sunday. Easter is a moveable feast, meaning it is not fixed in relation to the civil calendar. The First Council of Nicaea (325) established the date of Easter as the first Sunday after the full moon (the Paschal Full Moon) following the March equinox. Ecclesiastically, the equinox is reckoned to be on 21 March (although the astronomical equinox occurs on 20 March in most years), and the "Full Moon" is not necessarily on the astronomically correct date. The date of Easter therefore varies from 22 March to 25 April inclusive. Etymology Theological significance In the early Church Date Computations
Simple machine Table of simple mechanisms, from Chambers' Cyclopedia, 1728. Simple machines provide a "vocabulary" for understanding more complex machines. A simple machine is a non-motorized device that changes the direction or magnitude of a force. In general, a simple machine can be defined as one of the simplest mechanisms that provide mechanical advantage (also called leverage). Usually the term refers to the six classical simple machines which were defined by Renaissance scientists: Various authors have compiled lists of simple machines and machine elements, sometimes lumping them together under a single term such as "simple machines", "basic machines", "compound machines", or "machine elements"; the use of the term "simple machines" in this broader sense is a departure from the neoclassical sense of the six essential simple machines, which is why many authors prefer to avoid its use, preferring the other terms (such as "machine element"). History Compound machine
New Bill Could Allow California to Harness Power Otherwise Lost as Cars Travel Over Pavement Workers installing road piezoelectric devices We’ve been presenting over time how piezoelectric devices could harness energy from different sources, and I think we were right supporting this technology. The following is a Press Release sent to us by California Assemblyman Mike Gatto, who proposed a new bill that will implement piezoelectric technology already in use in Italy and Israel to harness energy from road vibrations. “Hybrid vehicles capture the energy lost while slowing down a vehicle and use that energy to power the car independently from the engine for significant stretches of time. But what if we could capture the energy lost as all automobiles move along a stretch of pavement and place that power into the electrical grid? A bill by Assemblyman Mike Gatto (D-Los Angeles) would do just that. “A major source of renewable energy is right beneath our feet — or, more accurately, our tires. Gatto’s bill, the Roadway / Highway Electrification Act pilot project, is AB 306.
Content » Blog Archive » 16th letter - epic A couple of months back, I wrote a post about my love/hate relationship with Twitter. In that article, I talked about what I see as being the big downfall of Twitter, which is that it is hard to quickly and easily get people using and understanding it. Twitter is hard to explain, there is no key selling proposition, people sign up and then leave, and the language of Twitter is hard to understand. But now I am starting to grasp what I think is the real reason that it’s so hard to catch onto Twitter – everyone uses it for something different. And because there is no standard way of using Twitter, it’s hard to watch the Twitter stream (the flow of posts to Twitter) and figure out what’s going on and how you should participate. The flexibility of Twitter is both its genius and its downfall. It’s unlikely that anyone sticks with just one way of using Twitter all the time. Here are just a few of the many ways that people use Twitter. Talking to people. Promotional tool. Information gathering.
electricity Liberalism Liberalism is a political philosophy or worldview founded on ideas of liberty and equality. Liberals espouse a wide array of views depending on their understanding of these principles, but generally they support ideas such as free and fair elections, civil rights, freedom of the press, freedom of religion, free trade, and private property. Etymology and definition Words such as liberal, liberty, libertarian, and libertine all trace their history to the Latin liber, which means "free". One of the first recorded instances of the word liberal occurs in 1375, when it was used to describe the liberal arts in the context of an education desirable for a free-born man. The word's early connection with the classical education of a medieval university soon gave way to a proliferation of different denotations and connotations. History Beginnings Glorious Revolution Era of enlightenment American revolution