Grand Central Station covers an area of 48 acres and has 44 platforms on two levels, with 67 tracks along them. There are 41 tracks on the upper level and 26 tracks on the lower level. All of them are built underground at the end of a long tunnel under Park Avenue, where trains have to change from diesel to electric power using a third rail to avoid problems with exhaust. These platforms serve commuters traveling on the Metro-North Railroad to Westchester County, New York, Putnam County, New York, and Dutchess County, New York in New York State, and Fairfield County, Connecticut and New Haven County, Connecticut in the state of Connecticut. By December 2022, the Long Island Rail Road will be extended to a new station at Grand Central, below the existing platforms. Once this happens, Grand Central will have a total of 75 tracks and 48 platforms.
Samuel P. Taylor State Park
Samuel P. Taylor State Park is a state park located in Marin County, California. It contains approximately of redwood and grassland. The park contains about of old-growth forest, some of which can be seen along the Pioneer Tree Trail.
Pedernales, Dominican Republic
Pedernales is a Dominican city and the capital of the Pedernales province, in the southwest of the country close to the border with Haiti.
The name of "Pedernales" was given to the town when it was founded because that was the name of the river that now is the border between Haiti and the Dominican Republic.
"Pedernales" or "silex" ("flint") is the name of a hard mineral that is common in the region.
Before the conquest of the island by European people, some native groups lived around the place where the city of Pedernales is now. But soon those groups disappeared and very few people came to live here because it is a very dry region.
When the French colony of "Saint-Domingue" (present Haiti) was created, the Pedernales river was the southern border between that colony and the Spanish colony of "Santo Domingo" (present Dominican Republic). During those colonial times, some soldiers came here for some time but almost nobody lived here for a long time.
In 1927, the Dominican government brought farmers from other places of the country and made a town for them; the new town was given the name of Pedernales and its first administrator was Sócrates Nolasco who later became a well-known writer.
The town became, in 1938, a municipal district (an administrative division of a municipality in the Dominican Republic) of Enriquillo, province of Barahona.
When the Pedernales province was created in 1957, the town of Pedernales became the capital of the new province.
The municipality had, in , a total population of 14,590: 7,473 men and 7,117 women. The urban population was of the total population.
The only rivers in the municipality, and in the province, are the Pedernales river and its tributary Mulito.
Sierra de Bahoruco ("Bahoruco mountain range") is in the northern half of the municipality; its highest mountain, and the highest mountain of the province, is "Loma del Toro", above sea level, in the limits with the Independencia province.
The municipality has a total area of and has only one municipal district (a subdivision of a municipality): José Francisco Peña Gómez.
The altitude of the city of Pedernales is above sea level.
The municipality of Pedernales has the Independencia Province to the north, the Barahona Province to the east, the municipality of Oviedo to the southeast, the Caribbean Sea to the south and Haiti to the west. The city is at about from the border with Haiti.
Pedernales has a subtropical steppe/low-latitude semi-arid hot climate (Köppen-Geiger classification: BSh).
The average amount of rainfall for the year in the city is . The month with the most precipitation on average is September with of rainfall, followed by October with .
The driest season is winter. The month with the least rainfall on average is January with an average of followed by February with an average of .
Pedernales is in a hot region; the average temperature for the year is . The warmest month, on average, is August with an average temperature of . The coolest month on average is January, with an average temperature of .
The municipality of Pedernales has only one municipal district:
Because Pedernales is on the border, the trade with Haiti is important. But the main economic activity is farming, mainly on the mountains, where coffee and beans are important products. Potato, cabbage and other vegetables are produced in the Sierra de Bahoruco.
Fishing is also an important activity in the province, mainly close to the Beata Island, where lobster, conch and several kind of fishes are caught.
Tourism is becoming an important economic activity because there are several beautiful beaches with white sand, like "Cabo Rojo" and "Bahía de las Águilas". There are two of the largest national parks of the country: the "Jaragua National Park" and the "Sierra de Bahoruco National Park".
Mining of limestone to send to other countries and for a cement factory is another important economic activity in the municipality.
Mohican
The Mahicans (also Mohicans) are a Native American tribe, who originally settled around the Hudson River. Many then moved to Massachusetts after 1780, before the remaining descendants moved to northeastern Wisconsin during the 1820s and 1830s.
The tribe's name for itself was Muhhekunneuw, or "People of the River."
Heaviside Function
The Heaviside function, often written as "H"(x), is a non-continuous function whose value is zero for a negative input and one for a positive input.
The function is used in the mathematics of control theory to represent a signal that switches on at a specified time, and which stays switched on indefinitely. It was named after the Englishman Oliver Heaviside.
The Heaviside function is the integral of the Dirac delta function: "H"′(x) = "δ"(x). This is sometimes written as
We can also define an alternative form of the Heaviside step function as a function of a discrete variable "n":
where "n" is an integer.
Or
The discrete-time unit impulse is the first difference of the discrete-time step
This function is the cumulative summation of the Kronecker delta:
where
is the discrete unit impulse function.
Often an integral representation of the Heaviside step function is useful:
The value of the function at 0 can be defined as "H"(0) = 0, "H"(0) = ½ or "H"(0) = 1. In particular:
Yasushi Kita
Yasushi Kita (born 25 April 1978) is a Japanese football player. He plays for Gainare Tottori.
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Hiroki Kobayashi
Hiroki Kobayashi (born 24 May 1977) is a former Japanese football player.
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Tomohiko Ito
Tomohiko Ito (born 28 May 1978) is a Japanese football player. He plays for Shonan Bellmare.
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Descriptive statistics
Descriptive statistics is a branch of statistics. Its aim is to summarize a set of statistical data. The data are usually taken by sampling a population. To picture the way the data are distributed, a histogram may be drawn. The data may be summarized by computing some characterising values, like the "center" of the dat, and the "spread". In some cases the different items of data will be grouped and the groups will be described, in some way.
Inference (statistics)
Statistical inference is the process of drawing conclusions from data that is subject to random variation. Examples would be observational errors or sampling variation.
For the most part, statistical inference makes statements about populations, using data drawn from the population of interest by some form of random sampling. The result is some kind of statistical proposition, such as:
Ânderson Lima
Ânderson Lima Veiga (born 18 March 1973) is a Brazilian football player.
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Silvio Spann