permeability
刘耀文的大沙雕
钟意阿满
Permeability
permeability 。
英[ˌpɜ:mɪə'bɪlətɪ] 美[ˌpɚmiəˈbɪlɪti] 。
n. 渗透性; 磁导率; 可渗透性; 。
[例句]J function can eliminate the impact of permeability and porosity by dimensionlesstreatment.。
而J函数就是通过无因次化处理消除了渗透率和孔隙度的影响。
抱起亚轩找小葵
岩土的渗透性的英文怎么说
Permeability is defined as the ability of water to flowthrough a saturated soil. A high permeability indicates that water flows rapidly through the void spaces，and vice versa.。
A measure of the soils permeability is the hydraulic conductivity，also known as the coefficient of permeability K. The hydraulic conductivity can be measured in the laboratory by using the constant-head ( ASTM D2434 － 94，1998 ) or falling-head ( ASTM D5084 － 97，1998) permeameter.。
Constant-head permeameter. Figure 5. 4 shows a constant-head permeameter apparatus. A saturated soil specimen is placed in the permeameter and then a head of water ( Δh ) is maintained. The hydraulic conductivity is based on Darcy's law，which states that the velocity v of flowin soil is proportional to the hydraulic gradient i，or:。
勘查工程专业英语
where K is hydraulic conductivity ( also known as coefficient of permeability) ，which has units of cm / s，and i is hydraulic gradient which is defined as the change in total head ( Δh ) divided by the length of the soil specimen ( L ) ，or i = Δh / L. From Equation ( 5. 1 ) ，the coefficient of permeability ( K ) from the constant-head permeameter can be calculated as follows:。
勘查工程专业英语
where Q is total discharged volume in milliliter in a given time t，A is area of the soil specimen，and L is length of the soil specimen. The total head loss Δh for the constant-head permeameter is defined in Figure 5. 4.。
The constant-head permeameter is often used for sandy soil that has a high permeability. It is important that the porous plate which supports the soil specimen has a very high permeability. As an alternative，a reinforced permeable screen can be used in place of the porous plate. Another important consideration is that the soil specimen diameter should be at least 10 times larger than the size of the largest soil particle.。
Figure 5. 4 Constant-head permeameter。
Figure 5. 5 falling-head permeameter。
Falling-head permeameter. Figure 5. 5 shows a laboratory falling-head permeameter. This equipment is often used to determine the hydraulic conductivity of a saturated silt or clay specimen. Filter paper is often placed over the porous plate to prevent the migration of soil fines through the porous plate. Also，a frequent cause of inaccurate results is the inability to obtain a seal between the soil specimen and the side of the permeameter. Because of these factors( migration of fines and inadequate sealing) ，a greater degree of skill is required to perform the falling-head permeability test.。
The objective of the falling-head permeability test is to allowthe water level in a small diameter tube to fall from an initial position h0to a final position hf. The amount of time it takes for the water level to fall from h0to hfis recorded. From Darcy's law，the equation to determine the hydraulic conductivity K for a falling-head test is as follows:。
勘查工程专业英语
where α is area of the standpipe，L is length of the soil specimen，A is area of the soil specimen，and t is time for the water level in the standpipe to fall from h0to hf.。
According to Terzaghi and Peck， the classification of soil according to hydraulic conductivity K is as follows:。
·High degree of permeability，K is over 0. 1 cm /s.。
·Medium degree of permeability，it is between 0. 1 and 0. 001 cm /s.。
·Lowpermeability，K is between 0. 001 and 1 × 10－ 5cm / s.。
·Very lowpermeability，K is between 1 × 10－ 5and 1 × 10－ 7cm / s.。
·Practically impermeable，K is less than 1 × 10－ 7cm / s.。
NewWords
勘查工程专业英语
词汇分类扩展
( 1) 典型室内试验( Typical laboratory tests)。
勘查工程专业英语
( 2) 土样物理性质测试( Soil physical property testing)。
勘查工程专业英语
( 3) 土的压缩性测试( Soil compression testing)。
勘查工程专业英语
( 4) 土的剪切试验( Soil shearing tests)。
勘查工程专业英语
( 5) 土的动力学测试( Soil dynamic testing)。
勘查工程专业英语
( 6) 岩石测试( Rock testing)。
勘查工程专业英语
大圣杰锅是
导磁率是什么？
岩土的渗透性的英文：
permeability of soils and rocks。
permeability是什么意思：
n. 浸透性,可透性,导磁性
This membrane is semi-permeable.。
这层膜是半渗透性的。
The waste material is placed in cells with permeable membranes。
废液置于有渗透膜的槽中。
The major difference is that geological structures have limited permeability.。
主要的问题是地质结构的渗透性有限。
soils是什么意思：
n. 土地，土壤；国土，领土
v.（被）弄脏
He died on British soil. 。
他死于英国。
The soil is difficult to work with.。
这块污迹很难处理。
The fertilization of soil is a subject to the farmers.。
肥料的施用对农民来说是一门学问。
rocks是什么意思：
n. 岩石，石山，碎石，摇滚乐，棒棒糖，宝石，可信赖的人。
v. 轻轻摇摆，恫吓，很好
straight or on the rock。
纯的或加冰块
He was rocking himself in a rocking chair.。
他坐在摇椅上摇动着。
He rocked back and forth in his rocking chair. 。
他坐在摇椅里前后摇晃着。
小韩在追星
服装的面料“透气性”用英语怎么说
铁、镍、锰等材料导磁率高。
μ ＝ 导磁率(magnetic permeability of material) (Henrys/meter) 。
μ 称之为导磁性材料的导磁率(permeability)。真空的导磁率定义为μo其值为 4π x 10^-7 H/m。
其他的物质相对於真空的导磁率称之为相对导磁率(relative permeability)。
相对导磁率可用来评估一种导磁材料其磁化容易的成度，例如钢(steel)常用於马达的制造，其相对导磁率约介於2000～6000之间，这表示同样的电流，如果采用矽钢片作为铁心则较空心的线圈能产2000～6000倍的磁通量，空气的导磁率与真空几乎是相同的。由此可知在变压器或马达铁心的材料，对其特性扮演了关键性的角色。
小韩在追星
什么是磁导率？
服装透气性的英文可以说air
permeability，也可以用breathability。
例句1：PTT
knitted
fabrics
comfort
properties
of
air
permeability,
moisture
permeability
and
moisture
conductivity
were
tested
and
evaluated. 。
对PTT针织面料的透气性、透湿性及导湿性等舒适性能进行了测试与评价。
例句2:
Things
to
look
for
in
lightweight
clothing:
synthetic
material
stay
away
from
cotton),
minimum
amount
of
pockets
and
zippers,
thin
fabric,
and
breathability.
轻量化的服装应选择只要注意：合成材料（远离棉质材料）、尽可能少的口袋和拉链、更薄的面料，而且具有透气性。