Seam Classification

The characteristics of connecting constructions that form the concept lead to a four-step order matrix for seam joints. Explanations of the characteristics and the access component are given for permanent seam junctions to convey an impression of the variety of the joining technologies in sewing. 

Simple lock stitch Double lock stitch Triple lock stitch Chain stitch  

Simple chain stitch Double chain stitch Triple chain stitch 

Two sewing thread system (needle and gripper thread) 

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According to ASTM D 6193 (American Society for Testing and Materials), seam classification relates directly to the positioning of fabric sections at the junction where these sections are sewn. Seams are divided into six classes. Each class is subdivided into types and designated by symbols as follows ... 

BS 3870-1 1991, Stitches and Seams. Classification and Terminology of Stitch Types. 

ASTM D 7722—11. Standard Terminology Relating to Industrial Textile Stitches and Seams. BS 3870—1 1991. Stitches and Seams. Classification and Terminology of Stitch Types. 

On the macroscopic scale, two coal classifications have been used humic or banded coals and sapropeflc or nonbanded coals. Stratification in the banded coals, which result from plant parts, is quite obvious the nonbanded coals, which derive from algal materials and spores, are much more uniform. The physical and chemical properties of the different layers in a piece of coal or a seam can vary significantly. Therefore the relative amounts of the layers are important in determining the overall characteristics of the mined product. Coal petrography has been widely appHed in cokemaking and is important in coal hquefaction programs. 

The same classification into winding numbers can be used in a system with N nuclear degrees of freedom, in which the Cl seam is an N — 2)-dimensional hyperline as in Fig. 1. For example, if we take N = 3, then the seam is a line the... 

This classification of the seams is justified and is well reflected in the proximate analyses and distribution of the vitrinoid types distinguished on the basis of reflectance values. The variation of the different macerals in each zone is shown in Figures 4 and 4a. 

Inherent or equilibrium moisture is used for calculating moist, mineral-matter-free calorific values for the rank classification of high-volatile bituminous coals. It is also used for estimating free or surface moisture, since total moisture is equal to the sum of the inherent moisture and the free moisture and is considered the inherent moisture of the coal as it occurs in the unexposed seam, where the relative humidity is probably near 100%. However, due to physical limitations, equilibrium moisture determinations are made at 96 to 97% relative humidity and used as inherent moisture values. 

Patterns of Elemental Distribution. The major, minor, and trace element abundances and the lithology of the stratigraphic sequence are summarized in Tables I and II for the Beulah coals. The data from the Center Mine is given in Karner and others ( 1) where the spatial distribution of elements in the seam was described as fitting into several patterns. In this study the classification of elemental distribution patterns includes 1) Concentration at... 

Defect classifications (weight, seams, seals, wall thickness, pin holes, etc.). 

The anteroom should be equipped with air classification or quality that meets ISO Class 8 standards with physical characteristics of smooth walls, floors, ceilings, fixtures, surfaces resistant to sanitizing agents, junctures covered and caulked, wall panel locked together and sealed, floors overlaid with wide sheet vinyl flooring with heat sealed seams and buffer or ante area with no sinks or floor drains. 

Processing production of coal sample and physical mechanic parameters test are in strict accordance with the provisions of Measurement method of coal and rode physical and mechanical properties (GB/T 23561-2009), and Measurement method of coal seam impact tendency classification index (MT/T 866-2000). The experiment determined natural apparent density, compressive strength, consistent coefficient, elastic modulus, deformation modulus, wave velocity, rock burst energy index, elastic energy index, dynamic failure time, and other parameters. The determination results as shown in Table 1. 

MT/T 866-2000. Measurement method of coal seam impact tendency classification index. 

The classification results of fine Sandstone, clay shale and coal seam are general. 

Table 1. Classification system of aquifer-protective mining in shallow coal seams. 

Classification Mineral Constituents Seam, Kentucky Seam, Kentucky... 

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