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FS Class ALe 642
FS ALe 642 is a class of Italian Electric Multiple Unit trains built from 1991 to 1995 for use on secondary lines and for commuter traffic. In service since 1991. Description This class is strictly derived from the previous ALe 582 and ALe 724 EMUs, sharing most of the mechanical and technical characteristics. The main differences are in the electrical part (especially traction control and low tension circuitry) and for the presence of 2nd class only seatings. The frontal part containing cabins consists of a preformed structure made of polyester reinforced with fiberglass. They originally had the ''Navetta'' livery, painted in gray with orange and red lateral stripes; now they all have received the corporate green-white XMPR livery. Technical description Units arrangement Like the previous EMUs on which they are based on, Class 642 can be divided in one or more sections containing a varying number of elements: * ALe 642.001 ÷ 60, the engine units with driving cabins (64 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bologna Centrale
Bologna Centrale is a railway station in Bologna, Italy. The station is situated at the northern edge of the city centre. It is located at the southern end of the Milan-Bologna high-speed line, which opened on 13 December 2008, and the northern end of three lines between Bologna and Florence: the original Bologna-Florence line through Porretta Terme and Pistoia; the Bologna–Florence Direttissima via Prato, which opened on 22 April 1934 and the Bologna-Florence high-speed line, which opened to traffic on 13 December 2009. Bologna Centrale is the fifth-busiest in Italy in terms of passenger movements (about 58 million passengers per year). It is, however, one of the busiest, along with Rome Termini Station, for the number of train movements per day (about 800). The station is linked to Bologna Guglielmo Marconi Airport by the Marconi Express, a direct monorail line in length, launched on 18 November 2020. Station There are two levels of railway tracks within the statio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tonne
The tonne ( or ; symbol: t) is a unit of mass equal to 1000 kilograms. It is a non-SI unit accepted for use with SI. It is also referred to as a metric ton to distinguish it from the non-metric units of the short ton ( United States customary units), and the long ton ( British imperial units). It is equivalent to approximately 2204.6 pounds, 1.102 short tons, and 0.984 long tons. The official SI unit is the megagram (symbol: Mg), a less common way to express the same mass. Symbol and abbreviations The BIPM symbol for the tonne is t, adopted at the same time as the unit in 1879.Table 6 . BIPM. Retrieved on 2011-07-10. Its use is also official for the metric ton in the United States, having been adopted by the United States |
Lucca
Lucca ( , ) is a city and ''comune'' in Tuscany, Central Italy, on the Serchio River, in a fertile plain near the Ligurian Sea. The city has a population of about 89,000, while its province has a population of 383,957. Lucca is known as one of the Italian's "Città d'arte" (Arts town), thanks to its intact Renaissance-era city walls and its very well preserved historic center, where, among other buildings and monuments, are located the Piazza dell'Anfiteatro, which has its origins in the second half of the 1st century A.D. and the Guinigi Tower, a tower that dates from the 1300s. The city is also the birthplace of numerous world-class composers, including Giacomo Puccini, Alfredo Catalani, and Luigi Boccherini. Toponymy By the Romans, Lucca was known as ''Luca''. From more recent and concrete toponymic studies, the name Lucca has references that lead to "sacred wood" (Latin: ''lucus''), "to cut" (Latin: ''lucare'') and "luminous space" (''leuk'', a term used by the firs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pontedera
Pontedera (; la, Pons Herae) is an italian comune with a population of 29.270 inhabitants, located in the province of Pisa, Tuscany, Central Italy, central Italy. The town is located 20 km (12 miles) from Pisa and 50 km (31 miles) from Florence. It houses the headquarters of the Piaggio company, of the Castellani (wine), Castellani winery and of the Amedei premium artisan chocolate factory. Pontedera is in the Arno Valley at the confluence of the Era River and the Arno River. Its territory is also crossed by the Scolmatore dell'Arno canal, and by the Roglio, a tributary of the Era. There is also a small lake, in the ''frazione'' of La Rotta, Pontedera, La Rotta, known as Braccini lake. The football team in the town is called U.S. Città di Pontedera, and they are currently placed in Serie C. History Pontedera was the seat of several historical battles. In 1369, the Milanese army of Barnabò Visconti, led by John Hawkwood, was defeated here by the Republic of Florence, Flor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Livorno
Livorno () is a port city on the Ligurian Sea on the western coast of Tuscany, Italy. It is the capital of the Province of Livorno, having a population of 158,493 residents in December 2017. It is traditionally known in English as Leghorn (pronounced , "Leghorn" in the . or ). During the , Livorno was designed as an "". Developing c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pisa
Pisa ( , or ) is a city and ''comune'' in Tuscany, central Italy, straddling the Arno just before it empties into the Ligurian Sea. It is the capital city of the Province of Pisa. Although Pisa is known worldwide for its leaning tower, the city contains more than twenty other historic churches, several medieval palaces, and bridges across the Arno. Much of the city's architecture was financed from its history as one of the Italian maritime republics. The city is also home to the University of Pisa, which has a history going back to the 12th century, the Scuola Normale Superiore di Pisa, founded by Napoleon in 1810, and its offshoot, the Sant'Anna School of Advanced Studies.Scuola Superiore Sant'Anna di Pisa Information statistics History ...
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Electric Current
An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge through a surface or into a control volume. The moving particles are called charge carriers, which may be one of several types of particles, depending on the conductor. In electric circuits the charge carriers are often electrons moving through a wire. In semiconductors they can be electrons or holes. In an electrolyte the charge carriers are ions, while in plasma, an ionized gas, they are ions and electrons. The SI unit of electric current is the ampere, or ''amp'', which is the flow of electric charge across a surface at the rate of one coulomb per second. The ampere (symbol: A) is an SI base unit. Electric current is measured using a device called an ammeter. Electric currents create magnetic fields, which are used in motors, generators, inductors, and transformers. In ordinary con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volt-ampere
A volt-ampere ( SI symbol: V⋅A or V A, simplified as VA) is the unit for the apparent power in an electrical circuit. The apparent power equals the product of root mean square voltage (in volts) and root mean square current (in amperes). Volt-amperes are usually used for analyzing alternating current (AC) circuits. In direct current (DC) circuits, this product is equal to the real power, in watts. The volt-ampere is dimensionally equivalent to the watt: in SI units, 1 V⋅A = 1 W). VA rating is most used for generators and transformers (and other power handling equipment) where loads may be reactive (inductive or capacitive). Formulation For a simple electrical circuit running on direct current, the electrical current and voltage are constant. In that case, the real power (''P'', measured in watts) is the product of the electrical current (''I'', measured in amperes) and the voltage from one side of the circuit to the other (''V'', measured in volts): ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Three-phase
Three-phase electric power (abbreviated 3φ) is a common type of alternating current used in electricity generation, Electric power transmission, transmission, and Electric power distribution, distribution. It is a type of polyphase system employing three wires (or four including an optional neutral return wire) and is the most common method used by electrical grids worldwide to transfer power. Three-phase electrical power was developed in the 1880s by multiple people. Three-phase power works by the voltage and currents being 120 degrees phase shift, out of phase on the three wires. As an AC system it allows the voltages to be easily stepped up using transformers to high voltage for transmission, and back down for distribution, giving high efficiency. A three-wire three-phase circuit is usually more economical than an equivalent two-wire Single-phase electric power, single-phase circuit at the same line to ground voltage because it uses less conductor material to transmit a giv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volt
The volt (symbol: V) is the unit of electric potential, electric potential difference (voltage), and electromotive force in the International System of Units (SI). It is named after the Italian physicist Alessandro Volta (1745–1827). Definition One volt is defined as the electric potential between two points of a conducting wire when an electric current of one ampere dissipates one watt of power between those points. Equivalently, it is the potential difference between two points that will impart one joule of energy per coulomb of charge that passes through it. It can be expressed in terms of SI base units ( m, kg, second, s, and ampere, A) as : \text = \frac = \frac = \frac. It can also be expressed as amperes times ohms (current times resistance, Ohm's law), webers per second (magnetic flux per time), watts per ampere (power per current), or joules per coulomb (energy per charge), which is also equivalent to electronvolts per elementary charge: : \text = \tex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bar (unit)
The bar is a metric unit of pressure, but not part of the International System of Units (SI). It is defined as exactly equal to 100,000 Pa (100 kPa), or slightly less than the current average atmospheric pressure on Earth at sea level (approximately 1.013 bar). By the barometric formula, 1 bar is roughly the atmospheric pressure on Earth at an altitude of 111 metres at 15 °C. The bar and the millibar were introduced by the Norwegian meteorologist Vilhelm Bjerknes, who was a founder of the modern practice of weather forecasting. The International System of Units, despite previously mentioning the bar, now omits any mention of it.. The bar has been legally recognised in countries of the European Union since 2004.British Standard BS 350:2004 ''Conversion Factors for Units''. The US National Institute of Standards and Technology (NIST) deprecates its use except for "limited use in meteorology" and lists it as one of several units that "must not be introduced ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chopper (electronics)
In electronics, a chopper circuit is any of numerous types of electronic switching devices and circuits used in power control and signal applications. A chopper is a device that converts fixed DC input to a variable DC output voltage directly. Essentially, a chopper is an electronic switch that is used to interrupt one signal under the control of another. In power electronics applications, since the switching element is either fully on or fully off, its losses are low and the circuit can provide high efficiency. However, the current supplied to the load is discontinuous and may require smoothing or a high switching frequency to avoid undesirable effects. In signal processing circuits, use of a chopper stabilizes a system against drift of electronic components; the original signal can be recovered after amplification or other processing by a synchronous demodulator that essentially un-does the "chopping" process. Comparison (step down chopper and step up chopper) Comparison bet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
