Marble, Minnesota

Marble is a city in Itasca County, Minnesota, United States. It is part of the chain of small mining towns known as the Iron Range. The population was 701 at the 2010 census.

U.S. Highway 169 serves as a main route in the community.

Geography

According to the United States Census Bureau, the city has a total area of 4.45 square miles (11.53 km²), of which 4.35 square miles (11.27 km²) is land and 0.10 square miles (0.26 km²) is water.

Demographics

2010 census

As of the census of 2010, there were 701 people, 281 households, and 174 families residing in the city. The population density was 161.1 inhabitants per square mile (62.2/km²). There were 315 housing units at an average density of 72.4 per square mile (28.0/km²). The racial makeup of the city was 93.4% White, 0.6% African American, 3.1% Native American, 0.4% Asian, and 2.4% from two or more races. Hispanic or Latino of any race were 0.3% of the population.

There were 281 households of which 32.7% had children under the age of 18 living with them, 41.6% were married couples living together, 13.9% had a female householder with no husband present, 6.4% had a male householder with no wife present, and 38.1% were non-families. 31.0% of all households were made up of individuals and 9.6% had someone living alone who was 65 years of age or older. The average household size was 2.47 and the average family size was 3.04.

Marble (software)

Marble is a virtual globe application which allows the user to choose among the Earth, the Moon, Venus, Mars and other planets to display as a 3-D model. It is free software under the terms of the GNU LGPL, developed by KDE for use on personal computers and smart phones. It is written in C++ and uses Qt 4 or 5.

Marble is intended to be very flexible; beyond its cross-platform design, the core components can easily be integrated into other programs. It is designed to run without the need for hardware acceleration, but it can be extended to use OpenGL. An important user-experience objective being that the application start fairly quickly, it ships with a minimal but useful off-line dataset (5–10MB).

Contributors have added support for on-line mapping sources such as OpenStreetMap and the ability to interpret KML files. Marble also provides route planning capabilities. A navigation mode called MarbleToGo was developed as part of Google Summer of Code 2010. It was later partially rewritten and renamed to Marble Touch.

Marble (disambiguation)

Marble is a type of rock resulting from the metamorphism of limestone.

Marble or Marbles may also refer to:

People

Places

In the United States

Music

Other

Loop (knot)

In reference to knots, loop may refer to:

References

Turn (biochemistry)

A turn is an element of secondary structure in proteins where the polypeptide chain reverses its overall direction. For beta turns go to Beta turn.

Definition

According to one definition, a turn is a structural motif where the C^α atoms of two residues separated by few (usually 1 to 5) peptide bonds are close (< 7 Å), while the residues do not form a secondary structure element such as an alpha helix or beta sheet with regularly repeating backbone dihedral angles. Although the proximity of the terminal C^α atoms usually correlates with formation of a hydrogen bond between the corresponding residues, a hydrogen bond is not a requirement in this turn definition. That said, in many cases the H-bonding and C^α-distance definitions are equivalent.

Types of turns

Turns are classified according to the separation between the two end residues:

In an α-turn the end residues are separated by four peptide bonds ().

In a β-turn (the most common form), by three bonds ().

In a γ-turn, by two bonds ().

Loopback

Loopback, or loop-back, refers to the routing of electronic signals, digital data streams, or flows of items back to their source without intentional processing or modification. This is primarily a means of testing the transmission or transportation infrastructure.

Many example applications exist. It may be a communication channel with only one communication endpoint. Any message transmitted by such a channel is immediately and only received by that same channel. In telecommunications, loopback devices perform transmission tests of access lines from the serving switching center, which usually does not require the assistance of personnel at the served terminal. Loop around is a method of testing between stations that are not necessarily adjacent, where in two lines are used, with the test being done at one station and the two lines are interconnected at the distant station. A patch cable may also function as loopback, when applied manually or automatically, remotely or locally, facilitating a loop-back test.