Hole (surname)
Hole is a surname. Notable people with the surname include:
Electron hole
In physics, chemistry, and electronic engineering, an electron hole is the lack of an electron at a position where one could exist in an atom or atomic lattice. It is different from the positron, which is an actual particle of antimatter.
If an electron is excited into a higher state it leaves a hole in its old state. This meaning is used in Auger electron spectroscopy (and other x-ray techniques), in computational chemistry, and to explain the low electron-electron scattering-rate in crystals (metals, semiconductors).
In crystals, electronic band structure calculations lead to an effective mass for the electrons, which typically is negative at the top of a band. The negative mass is an unintuitive concept, and in these situations a more familiar picture is found by considering a positive charge with a positive mass.
Solid-state physics
In solid-state physics, an electron hole (usually referred to simply as a hole) is the absence of an electron from a full valence band. A hole is essentially a way to conceptualize the interactions of the electrons within a nearly full system, which is missing just a few electrons. In some ways, the behavior of a hole within a semiconductor crystal lattice is comparable to that of the bubble in a full bottle of water.
Playmaker
In association football, a playmaker is a player who controls the flow of the team's offensive play, and is often involved in passing moves which lead to goals, thanks to their vision, technique, ball control, creativity, and passing ability.
In English football, the term overlaps somewhat with an attacking midfielder, but the two types of midfielders are not necessarily the same, as playmakers are not necessarily constrained to a single position. Several playmakers can also operate on the wings, or as a creative, supporting striker; some can also function in a more central midfield role, alternating between playing in more offensive roles and participating in the build-up plays in the midfield. Other players still function as deep-lying playmakers, in a free role, behind the mid-field line. Playmakers are not usually known for their defensive capabilities, which is why they are often supported by a defensive midfielder. As many midfielders and forwards have the aforementioned creative and technical attributes, they tend to be the playmakers of a team.
Decipher (After Forever album)
Decipher is the second album by Dutch symphonic metal band After Forever, released in 2001. In this album, the band make use of live classical instruments and a complete choir to back up the soprano voice of lead singer Floor Jansen. Thrown in the mix are also a duet of soprano and tenor voices in "Imperfect Tenses" and the recording of the late Israeli PM Yizhak Rabin voice during the Peace treaty signing ceremony on October 26, 1994 on "Forlorn Hope". This is the last After Forever album with guitarist and founder Mark Jansen, who left the band soon after its release.
The album has been re-released by Transmission Records in 2003 in a limited edition of 5,000 copies worldwide. The limited edition in digipack had an extended booklet, a sticker with new artwork and two bonus live tracks.
The album was re-released in 2012 as a 2-disc set by the re-financed Transmission Records.
Track listings
Personnel
References
Zenith camera
A zenith camera is an astrogeodetic telescope used today primarily for the local surveys of Earth's gravity field. Zenith cameras are designed as transportable field instruments for the direct observation of the plumb line (astronomical coordinates) and vertical deflections.
Instrument
A zenith camera combines an optical lens (about 10–20 cm aperture) with a digital image sensor (CCD) in order to image stars near the zenith. Electronic levels (tilt sensors) serve as a means to point the lens towards zenith. Zenith cameras are generally mounted on a turnable platform to allow star images to be taken in two camera directions (two-face-measurement). Because zenith cameras are usually designed as non-tracking and non-scanning instruments, exposure times are kept short, at the order of few 0.1 s, yielding rather circular star images. Exposure epochs are mostly recorded by means of the timing-capability of GPS-receivers (time-tagging).
Data processing
Depending on the CCD sensor - lens combination used, few 10s to 100s of stars are captured with a single digital zenith image. The positions of imaged stars are measured by means of digital image processing algorithms, such as image moment analysis or point spread functions to fit the star images. Star catalogues, such as Tycho-2 or UCAC-3 are used as celestial reference to reduce the star images. The zenith point is interpolated into the field of imaged stars, and corrected for the exposure time and (small) tilt of the telescope axis to yield the direction of the plumb line.
Zenith (disambiguation)
The zenith is the point in the sky that appears directly above the observer (opposite: nadir).
Zenith may also refer to:
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