pattern

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pattern

Manufacturing a wooden or metal shape or model used in a foundry to make a mould
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Pattern

The juxtaposition of repetitive elements in a design, organized so as to produce an arrangement of parts that are viewed as an unit; may occur at various scales and sizes.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Pattern

 

(also, development), in geometry. The pattern of a polyhedron is a set of polygons for which it is shown how the sides and vertices of the polygons must be joined in order to ob-

Figure 1

tain the polyhedron. Several conditions must be met here: each side of a polygon must be joined to no more than one side of another polygon; it must be possible to pass from one polygon to another polygon by traversing pairwise joined polygons; and joined sides must have equal lengths. The pattern of a cube is shown in Figure 1.

Figure 2

In such fields as descriptive geometry and drafting, the concept of pattern is sometimes applied to curved surfaces. Thus, the pattern of the lateral surface of a cone is a sector of a circle (Figure 2).


Pattern

 

(Russian, shablom), in foundry production, an element of a gated pattern, consisting of a flat device whose working side has a highly accurate profile. A distinction is made between molding and control patterns. The former, in the form of wooden boards, are used in individual and small-series production; they take the place of a solid casting pattern or corebox in the manufacture of casting molds and mold cores for medium-size and large castings having the outline of a body of revolution (such as cups, vats, covers, and pulleys). The cavity of the mold or the working surface of the core is produced by rotating the molding pattern around its central axis (a core spindle is positioned at this place in the mold). Control patterns are made of plywood or sheet steel and are used for checking the accurate placement of cores in the cavity of a casting mold during assembly and preparation for pouring.

M. N. SOSNENKO

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

pattern

[′pad·ərn]
(aerospace engineering)
The flight path flown by an aircraft, or prescribed to be flown, as in making an approach to a landing.
(engineering)
A form designed and used as a model for making things.
(graphic arts)
A design or form.
(mathematics)
An equivalence class of colorings of the elements of a finite set, which are indistinguishable with respect to a group of permutations of the colors.
(ordnance)
The distribution of a series of shots fired from one gun or a battery of guns under conditions as nearly identical as possible, the points of impact of the projectiles being dispersed about a point called the center of impact.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

pattern

1. A model made in some easily worked material (such as plaster or wood) which serves as a guide, with respect to form and dimensions, in laying out any piece of work, esp. to preserve and secure uniformity and accuracy.
2. A design, considered as a unit, of which an idea can be given by a fragment, as a diaper pattern.
3. In molding, a form used to provide the interior shape of the mold.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

pattern

pattern
Typical radiation pattern of a radar.
i. A flight pattern that an aircraft must follow when approaching for landing and when leaving the airport after takeoff.
ii. Radiation of the transmitting aerial as plotted on a diagram of the field strength for each bearing.
iii. A shape traced out on the ground by the track of the aircraft while following certain procedures, such as making the circuit, making procedure turns, while holding, and while carrying out demonstrations. See circuit and holding pattern.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
Cytological examination showed atypical epithelial cells with hypercellular and trabecular patterns around the nucleus and fine chromatin, and some cells had grooves.
Caption: Figure 3: (a) Figure showing CBCT scan: axial section showing typical granular trabecular pattern and bicortical expansion with more than half of maxillary sinus involvement in relation to the maxillary right back tooth region.
However, the presence of a substantial trabecular pattern was relatively uncommon; therefore, its practical predictive use is limited.
(6) In our case, the right mastoid showed an increased T2-weighted MRI signal in the mastoid air space, with a trabecular pattern consistent with mucosal thickening within the air cells (figure 2).
Cells composing tumor are arranged in trabecular pattern. (H & E, X40)
High power magnification also showed diffuse architecture of cells (trabecular pattern).
(10) Histologically, spindle cell schwannomas are moderately to highly cellular lesions composed of spindle cells, often arranged in a trabecular pattern. (10) Fibrovascular septa that contain a lymphoplasmacytic infiltrate are also common.
General coarsening and fuzziness of the trabecular pattern was noted, however, with associated widening of the left paraspinal shadow (Figure 1).
Microscopic Examination: Sections studied show tumor tissue arranged in a trabecular pattern with individual cells showing indistinct cell borders and abundant pale eosinophilic cytoplasm.
As shown in Figure 4, PMMA filled the marrow space in the expected trabecular pattern. Because of the patient's previous aortic valve replacement, 1 g of Kefzol (Eli Lilly and Co., Indianapolis, IN) was administered intravenously during the procedure.
(11) The tumor cells can be spindly, ovoid, or polygonal, and they can exhibit a storiform, fascicular, whorled, diffuse, follicle-like, or trabecular pattern. Most tumors have more than one growth pattern.