compression-fitting是什么意思

英语翻译
The difference in soil behavior in compression and in shear
suggests to separate the stresses and deformations into two parts,one
describing compression,and another describing shear.This will be presented in
this chapter.Dilatancy will be disregarded,at least initially.
13.1 Strain and stress
The components of the
displacement vector will be denoted by,and .If these displacements are not constant throughout the
field there be deformations,or strains.In Figure 13.1 the strains in the x,
y-plane are shown.
The change of length of an
element of original length ,divided by that original length,is the horizontal strain .This strain can be expressed into the displacement
difference,see Figure 13.1,by
.
The change of length of an element of
original length ,divided by that original length,is the vertical strain .Its definition in terms of the displacement is,see Figure
13.1,
Becausecan increase in y-direction,andin x-direction,the right angle in the lower left corner of
the element may become somewhat smaller.One half of this decrease is denoted
as the shear strain ,
Similar strains may occur in the other
planes,of course,with similar definitions.In the
genes al three dimensional case the definitions of the strain components are
All derivatives,,,etc，are assumed to be small compared to 1.Then
the strains are also small compared to 1.Even in soils,in which considerable
deformations may occur; this is usually valid; at least as a firstapproximation.

英语翻译
The level of MJPEG image
compression.High
compression reduces the fil
size.Low compression
produces optimum picture
quality,but larger file sizes.

英语翻译
The Reading Material
High compression for starting and lower compression under load is highly desirable for diesel engines .One method of attaining this goal is the variable compression ratio (VCR)piston.
One form of VCR piston has been developed that provides improved starting ,better isling and improved output per cubic inch of displacement .Comparisons were made of a VCR piston engine and a conventional engine of the same displacement and same general design.Tests indicated a gross brake horsepower (bhp) for the conventional engine of 550.the engine with VCR pistons produced 1475 bhp .
Other variable compression ratio components include the connecting rod ,which is modified to allow engine oil to transfer from the connecting rod bearing through a slipper to the inner piston .The outer piston corresponds to the normal piston in that it contains the combustion chamber and oil rings .The inner piston is an aluminum forging and contains the valves and hydraulic sealing rings .It is connected to its rod by the piston pin in the conventional manner .
The entire assembly of inner and outer pistons is limited in travel by the piston retaining ring ,which provides a mechanical stop for upward motion of the piston .

英语翻译
1、Effect of compression ratio on combustion and emission characteristics of a direct-injection natural gas engine
2、Experimental investigation of prechamber autoignition in a natural gas engine for cogeneration
3、Improving the efficiency of the advanced injection low pilot ignited natural gas engine using organic rankine cycles

托福阅读句子看不懂
It works in compression to divert the weight above it out to the sides,where the weight is borne by the vertical elements on either side of the arch.