中砂

中砂1分别为76.26%、81.40%、87.99%；

In the first kind of the medium sand is 76.26 % , 81.40 % and 87.99 % , respectively ;

CFRP加筋中砂的试验研究

Experimental Study of Medium Sand Reinforced with CFRP

矿石中砂结构，分选性好；矿石w（SiO2）高达98.77%～98.98%，w（Fe2O3）仅0.038%～0.045%，实属少见的超纯石英砂岩矿床。

The ore SiO_2 content is up to 98.77 % ~ 98.98 % . Fe_2O_3 only 0 . 038 % ~ 0.045 % , which belongs to a ultra pure quartz sandstone mineral deposit .

推荐实验参数为：泥沙的质量分数70%、磨损面冲击角30°、磨损时间60min，采用中砂。

The recommendable test parameters are sand slurry concentration 70wt % ( with middle sand ), impact angle 30 ° and wear time 60 min. The results show that the tester can simulate the dredge conditions correctly .

苏丹输油管道在喀土穆北45km处穿越尼罗河，穿越处河床分布的主要地层为中砂、卵石及努比亚砂岩。

Sudan oil pipeline will pass through Nile 45 km away north of Al Khartoum . The mainly distributed strata at river bed includes medium sand , peddle and Nubia sandstone .

DMP-D对土壤微生物的数目有一定的影响，它能抑制硝化细菌的活性，降低土壤氮的硝化。可见，不同的土壤中砂姜黑土的硝化作用活性较弱，而反硝化活性较强；

The influence of DMP-D on soil potential nitrification and microorganism were also studied . DMP-D had some effect on the number of the soil microorganisms , can significantly reduce the activity of soil microorganisms and slow down the nitrification potential .

袋装砂井处理软土地基中砂井间距计算方法探讨

Discussion About Calculation Method of Sand Wick Space in Soft Foundation Treatment

平面应变有限元分析中砂井的处理方法

A methodology for modeling sand-drain ground in plain strain analysis

三轴试验中砂性土的二氧化碳饱和技术

Carbon Dioxide Saturation Technology of Sand Soil in Triaxial Test

臭氧-生物活性炭工艺中砂滤池作用的研究

Study on the Sand Filter in the System of O_3 - BAC

浅析普通水泥混凝土配合比设计中砂率的确定

Initial analysis on confirming of sand ratio in common cement concrete mixing ratio design

对改性沥青混合料中砂率的研究

Research on sand ratio of modified asphalt mixture

三轴剪切过程中砂的孔隙水压力变化规律

Pore-Water Pressure of Sand During Triaxial Shear Process

复合地基中砂垫层作用机理研究

Function of sand cushion in composite foundations

静载下饱和冻结中砂的弹性模量与温度及应变率的关系

Relationship among elastic modulus , temperature and strain rate of frozen medium under static loading

加入中砂后，透水混凝土耐磨性能也有很大提高。

After adding the sand , abrasion resistance of pervious concrete has been improved too .

加砂设备中砂的输送

Sang-Conveying in Sand-Feeding Equipment On Sand

在砂纸式试件的磨光试验中砂的粒径对试验值有明显影响。

In the sand paper test , the particle size has strong effect on the result .

中砂融沉位移与单桩负摩阻力关系的试验研究

Test Study on Relation Between Thaw Collapse Displacement of Medium Sand and Negative Friction of Single Pile

振动频率和成样方法对饱和中砂动力特性的影响

The Effect of the Vibration Frequencies and Sample Preparation Methods on Dynamic Behavior on Saturated Medium Sands

平均粒径分别落在极细砂、细砂、中砂和粗砂粒级；

Mean grain size is in the scale of very fine , fine , medium and coarse sand respectively ;

南海中部海区表层沉积物中砂级全组分的初探

Study on > 63 μ m Sand Composition in . the Surface Sediments of the Central South China Sea

用粉煤灰中砂碎石水泥配制大体积无裂缝砼的研究

Study on the manufacturing no-Crevices in lage Volume Concrete with Fly-Ash , Medium sand , Crushed stone and Cement

地层剖面中砂泥岩石组合天然气综合扩散系数模拟及应用

A method to simulate gas comprehensive diffusion coefficient of sandstone and mudstone combination in strata section and its application

臭氧&生物活性炭滤池运行及水厂成本变化研究臭氧-生物活性炭工艺中砂滤池作用的研究

Research on operation of O_3 / BAC facility and operating cost of waterworks Study on the Sand Filter in the System of O_3-BAC

对中砂的中低氨氮进水系统，通过缩短水力负荷周期，会使去除效果得到明显改善。

For the medium sand system of the low ammonia nitrogen , by shortening HLC , the removal effect of the system is significantly improved .

本课题根据实际工程中砂卵石地层的特性，分别采用冲抓与冲击钻进、泵吸反循环配合大直径滚刀钻头钻进对两个工程进行施工，收到了良好的效果。

We have used the lash-clutch and lash method , pump-reverse-direction and large diameter hob bit process to construct to engineering , which are very good .

在等厚度淤积层的覆盖下，河床中砂卵石的渗流通量随着河道水深的增大而增大。

Covered by the sullage with the same depth , the seepage flux of cobblestone in the river course increases with the increase of water depth .

表层沉积物类型有6种：砂砾、粗砂、粗中砂、中细砂、细砂、粉砂质粘土。

The surface sediment possess six types : sandy gravel , coarse sand , coarse middle sand , middle fine sand , fine sand , silty clay .

袋中砂的主要目的是在保证材料的连续接触而不妨碍压缩空气的自由扩散。

The sand in the bags has the principal task of guaranteeing continuity of contact in the material without impeding the free diffusion of the compressed air .