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Topic: Perpendicular

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Line (mathematics)

Parallel (geometry)

Right angle

Line segment

Plane (mathematics)

Hyperbolic space

Angle

Ultraparallel theorem

Line

Chord (geometry)

Axis of rotation

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	Quadrilaterals Formed by Perpendicular Bisectors
		is the perpendicular bisector of the diagonal BD.
		is the perpendicular bisector of the diagonal BD of the quadrilateral ABCD.
		of the former is the perpendicular bisectors of the diagonal A
	www.cut-the-knot.org /Curriculum/Geometry/PerpBisectQuadri.shtml (643 words)

	Storage Technology
		In perpendicular recording, the magnetization of the bit is aligned vertically –; or perpendicularly – in relation to the disk drive’s platter.
		Perpendicular recording was first demonstrated in the late 19th century by Danish scientist Valdemar Poulsen, the first person to demonstrate that sound could be recorded magnetically.
		Using perpendicular recording, scientists at Hitachi GST and other companies believe that the effects of superparamagnetism can be further forestalled, which would create opportunities for continued robust growth in areal density at a rate of about 40 percent each year.
	hitachigst.com /hdd/research/recording_head/pr/PerpendicularPaper.html (1834 words)

	Guzik - Magnetic Recording Systems and Measurements Chapter 7
		When perpendicular head and media are used, the media grains are oriented in the "depth" of the medium and their magnetization is pointing either "up" or "down".
		In the case of perpendicular recording, the head is sensitive to media magnetization, therefore the uniformly magnetized media region generates constant read-back voltage of a given polarity in the read sensor.
		For perpendicular medium, a well-defined square-wave read-back signal is expected, since the output of the GMR sensor is proportional to the medium magnetization level (Figure 7.2).
	www.guzik.com /solutions_chapter7.shtml (4401 words)

	Perpendicular magnetic recording medium method for producing the same, and sputtering device - Patent 4576700
		The known perpendicular magnetic recording medium is produced by means of RF sputtering and comprises a Permalloy layer, as layer of a low coercive-force material, between the nonmagnetic base and the hcp cobalt alloy layer.
		Such orientation is referred to as perpendicular orientation and is evaluated by subjecting a magnetic film to X-ray diffraction, obtaining the rocking curve of the diffraction peak from the (002) plane of the hexagonal closest packing (hcp) structure, and measuring the half value width.DELTA..theta..sub.50 of the rocking curve.
		In the perpendicular magnetic recording technique, to attain a high recording density, it is important that the perpendicular coercive force H.sub.cv of the perpendicular magnetic recording medium matches the magnetic characteristics of the recording and/or regenerating head.
	www.freepatentsonline.com /4576700.html (6947 words)

	Perpendicular recording: the next generation of magnetic recording - Tape/Disk/Optical Storage Computer Technology ...
		Perpendicular recording is widely seen as the next method of recording that will be adopted to help push areal densities further.
		In perpendicular recording, the magnetization of the disc-- instead of lying in the disc's plane as it does in longitudinal recording--stands on-end perpendicular to the plane of the disc.
		In perpendicular recording, the media is deposited on a soft magnetic underlayer that functions as part of the write field return path and effectively produces an image of the recording head that doubles the recording field, thus enabling one to record bits at a higher density than longitudinal recording.
	www.findarticles.com /p/articles/mi_m0BRZ/is_5_23/ai_103731260 (820 words)

	Perpendicular - Wikipedia, the free encyclopedia
		In geometry, two lines are considered perpendicular if one falls on the other in such a way as to create two equal angles.
		Thus, referring to Figure 1, the line AB is the perpendicular to CD through the point B. If a line is perpendicular to another as in Figure 1, the two angles created are called right angles, or angles measuring 90°.
		To prove that the PQ is perpendicular to AB, use the SSS congruence theorem for triangles QPA' and QPB' to conclude that angles OPA' and OPB' are equal.
	en.wikipedia.org /wiki/Perpendicular (360 words)

	4. SETTING OUT RIGHT ANGLES AND PERPENDICULAR LINES
		A line perpendicular to the base line has to be set out from pole (C); pole (C) is not on the base line.
		It is thus possible to see the base line and the perpendicular line at the same time; no assistant is needed to check if the operator is standing on the base line, as is the case with the single prismatic square.
		A line perpendicular to the base line has to be set out from pole (C) which is not on the base line.
	www.fao.org /docrep/R7021E/r7021e05.htm (1568 words)

	DailyTech - Seagate Launches High Capacity 5400.3 Hard Drives
		Perpendicular recording alleviates this barrier by recording the bits standing up, which allows more bits to be recorded in a smaller area.
		Manufacturers will be launching perpendicular technology in small form factor hard drives like those for notebooks first, thanks to their smaller read/write heads.
		Currently, perpendicular technology will only be offered in Seagate's Momentus 5400.3 160GB model, but the company plans to transition all models and release drives ranging from 40GB to 160GB capacities in 20GB increments by the end of March.
	www.dailytech.com /article.aspx?newsid=283 (930 words)

	Geek.com Geek News - Toshiba goes perpendicular first (Site not responding. Last check: 2007-10-10)
		Toshiba is claiming a victory by being the first to bring perpendicular storage technology to market.
		All the top storage companies have been working with perpendicular technology for a while, but Toshiba is the first to release a commercial product using it.
		Perpendicular storage works on the principle of storing data in a 3D space rather than the traditional 2D plane approach.
	www.geek.com /news/geeknews/2005Aug/gee20050818031894.htm (1140 words)

	Seagate Technology News Release Seagate Ships World's First 160GB Notebook PC Hard Drives with Perpendicular Recording ... (Site not responding. Last check: 2007-10-10)
		Perpendicular recording stands data bits on end on the disc, rather than flat to the surface as with existing longitudinal recording, to deliver new levels of hard drive data density and capacity.
		The perpendicular recording performance boost comes without increases in power consumption or heat generation - crucial as remote users look to work longer between battery charges and system builders seek to pack more performance in smaller notebooks.
		Perpendicular recording is a key addition to the 2.5-inch Momentus family, allowing the drives to deliver higher capacity and performance without increasing spin speed, power consumption or heat dissipation.
	www.seagate.com.cob-web.org:8888 /cda/newsinfo/newsroom/releases/article/0,1121,2949,00.html (866 words)

	Construction of the Perpendicular Bisector
		The perpendicular bisector of a line segment AB is one of the most common and elementary point loci in geometry.
		The perpendicular bisector of a line segment AB is the line through the midpoint (E in the applet below) perpendicular to AB.
		Three perpendicular bisectors of the sides of a triangle intersect in the triangle's circumcenter.
	www.cut-the-knot.org /Outline/Geometry/PerpBisector.shtml (473 words)

	EETimes.com - Perpendicular drives debut (Site not responding. Last check: 2007-10-10)
		Nevertheless, perpendicular recording is expected to help vertically integrated companies such as Hitachi GST and Seagate Technology distance themselves, at least temporarily, from their competition.
		For cost and time-to-market reasons, drive makers are generally expected to introduce perpendicular recording using recording heads that are as similar as possible to those in today's longitudinal drives.
		Although potentially short-lived, perpendicular recording will eventually cover the waterfront from miniature 1-inch consumer drives to mainstream 2.5-inch notebook and desktop drives to mega 3.5-inch drives used in servers and personal video recorders.
	www.eetimes.com /showArticle.jhtml?articleID=160503065 (1364 words)

	Perpendicular Lines (via CobWeb/3.1 planet03.csc.ncsu.edu) (Site not responding. Last check: 2007-10-10)
		Two lines are perpendicular if the product of their slopes is -1.
		Determine if y = 2x+5 and x+2y = -2 are perpendicular then graph the equations to check.
		Determine if y = x+2 and 4x+2y = 4 are perpendicular then graph the equations to check.
	www.terragon.com.cob-web.org:8888 /tkobrien/algebra/topics/perpendicularlines/perpendicularlines.html (113 words)

	BBC - GCSE Bitesize - Maths \| Algebra: higher \| Perpendicular lines
		You can work out whether 2 lines are perpendicular by multiplying their gradients.
		In exams you will often be asked to find the equation of a line perpendicular to a given line.
		Remember that when 2 lines are perpendicular, the product of their gradients is -1.
	www.bbc.co.uk /schools/gcsebitesize/maths/algebrah/graphsrev3.shtml (386 words)

	Perpendicular recording - Wikipedia, the free encyclopedia
		In August 2006 Fujitsu extended its 2.5-inch lineup to include SATA models utilising perpendicular recording, offering up to 160GB capacity.
		Perpendicular Magnetic Recording (Hardcover) by Sakhrat Khizroev, Dmitri Litvinov: ISBN 1-4020-2662-5
		Perpendicular Hard Disk Drives An article by Sean Nicholls
	en.wikipedia.org /wiki/Perpendicular_recording (865 words)

	Parallel and Perpendicular Lines
		Find the slope of a line perpendicular to the line whose equation is 3y + 2x = 6.
		Find the equation of the line perpendicular to the line whose equation is 2y - 4x = 7 and whose y-intercept is +5.
		Find the equation of the line perpendicular to the line whose equation is 2y - 4x = 7 and which passes through the point (1,2).
	regentsprep.org /Regents/math/parallel/pracParallel.htm (243 words)

	Illuminations: IGD: Perpendicular Bisector (Site not responding. Last check: 2007-10-10)
		The perpendicular bisector is a line that is perpendicular to a segment and divides it into two congruent segments.
		Use the Measure button to verify that line PQ is perpendicular to segment AB and that point M is the midpoint of AB.
		This is the perpendicular bisector of segment AB.
	illuminations.nctm.org /ActivityDetail.aspx?id=57 (335 words)

	CD Baby: PERPENDICULAR: Form Follows Funk
		In Geometry, perpendicular means the intersection of two lines to form a right angle.
		In this case, Perpendicular refers to the way lines of musical styles converge and intersect - so the result feels 'right' to me, and hopefully to the listener as well." With each song blending organic and electronic sounds with catchy melodies, clever lyrics, skillful musicianship, and soulful, expressive vocals, the results are "right" indeed.
		Overall, the singular artistic vision and craftsmanship embodied in Perpendicular's Form Follows Funk is a refreshing departure from the cloned sheep and one-trick ponies that overpopulate the landscape of popular music today.
	www.cdbaby.com /cd/perpendicular (1055 words)

	Hitachi Demos 230 Gb Per Square Inch Data Density on Perpendicular Recording
		One of the key challenges facing the hard drive industry is overcoming the constraints imposed by the superparamagnetic effect, which occurs when the microscopic magnetic grains on the disk become so tiny that they interfere with one another, thus losing their ability to hold their magnetic orientations.
		Perpendicular recording has its roots in the late 19th century work of Danish scientist Valdemar Poulsen, who is generally considered the first person to magnetically record sound using perpendicular recording.
		While the transition to perpendicular recording will start as early as the next product generation, Hitachi believes the true potential will be realized in the 200+ Gb/in2 range -- the point of technology maturation when meaningful advancements in storage capacity will ensure full-scale adoption of perpendicular recording technology.
	www.physorg.com /news3588.html (1731 words)

	Perpendicular drives hit the market \| CNET News.com (via CobWeb/3.1 planet03.csc.ncsu.edu) (Site not responding. Last check: 2007-10-10)
		Perpendicular recording involves recording data in vertical, three-dimensional columns rather than in two dimensions on a plane.
		Although the shift to perpendicular recording methods greatly increases the amount of data that can be stored in a small space, it has forced the drive industry to put extra work into developing disk media, new heads and new electronics.
		Hitachi also plans to come out with perpendicular drives this year, as well as an even more dense version of these types of drives in 2007.
	news.com.com.cob-web.org:8888 /Perpendicular+drives+hit+the+market/2100-1041_3-5834979.html (461 words)

	College Algebra Tutorial on Parallel and Perpendicular lines
		Since the slopes of perpendicular lines are negative reciprocals of each other, what do you think the slope of any perpendicular line to this line is? Give yourself a high five if you said 1/7.
		Since slopes of perpendicular lines are negative reciprocals of each other, what do you think the slope of the perpendicular line is? This one is a little trickier.
		The slope of the perpendicular line in this case would be the slope of a horizontal line which would be 0.
	www.wtamu.edu /academic/anns/mps/math/mathlab/col_algebra/col_alg_tut28_parpen.htm (1835 words)

	Toshiba Ships 'Perpendicular' Disk Drive - Hardware News by InformationWeek (Site not responding. Last check: 2007-10-10)
		The announcement marks the beginning of the end of a 20-year quest to commercialize perpendicular recording to boost drive capacity.
		Toshiba provided few specifics about how it has implemented perpendicular recording in its new MK4007GAL drive except to say it is using both new media and new current-perpendicular-to-plane recording heads.
		That’s significantly lower than prototype perpendicular drives Seagate showed in 2003 at 170-Gbits per square inch and Hitachi showed earlier this year at 230-Gbits per square inch.
	www.informationweek.com /hardware/personaltech/169300112 (632 words)

	Slope: Parallel and Perpendicular Lines
		The other "opposite" thing with perpendicular slopes is that they are reciprocals; that is, you take the one slope, and flip it upside down.
		Put this together with the sign change, and you get that the perpendicular slope is the "negative reciprocal" of the original slope (and lines with slopes that are negative reciprocals are perpendicular).
		If the lines are close to parallel or close to perpendicular (or if you draw messily), you can get the wrong answer from a picture.
	www.purplemath.com /modules/slope2.htm (287 words)

	Math Forum: Perpendicular Lines (Chameleon Graphing: Lines and Slope)
		These two lines are perpendicular: they meet at a 90° angle.
		We could try to check whether or not these lines are really perpendicular by using a protractor, but it's hard to measure a picture on a computer monitor without making mistakes.
		The Math Forum is a research and educational enterprise of the Drexel School of Education.
	mathforum.org /cgraph/cslope/perpendicular.html (244 words)

	Perpendicular -- from Wolfram MathWorld
		Two lines, vectors, planes, etc., are said to be perpendicular if they meet at a right angle.
		Perpendicular objects are sometimes said to be "orthogonal."
		This relationship is commonly denoted with a small square at the vertex where perpendicular objects meet, as shown above, and is denoted
	mathworld.wolfram.com /Perpendicular.html (111 words)

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