FDN

For the double mix high properties concrete which mixed into mineral and FDN we tested its enduring .

对采用掺加矿物掺和料和高效减水剂双掺技术配制的高性能混凝土进行耐久性试验研究；

And dry shrinkage of concrete compound mixed with slump retaining agent at 28 days decreases about 10 % compared with simply mixed FDN , and that also has somewhat decrease compared with reference concrete .

复掺保坍剂的混凝土28d干燥收缩率与单掺萘系减水剂相比降低了10%左右，同时与基准混凝土相比也有所降低。

Synthesis and Application of FDN Naphthalene Based High Efficiency Water Reducer

FDN萘系高效减水剂的合成与应用

The author puts forward the concept of FDN , and analyzes its scope and characteristics .

提出飞行力学导航法的概念，并分析了其适用范围和特点。

Adsorption of FDN and CLS on grade g cement from mixed solutions competition

FDN与CLS在G级水泥上的吸附竞争

Application of FDN concrete admixture series for c20 ~ c60 pumping concrete projects

FDN系列外加剂在各种泵送混凝土（C2～C60）工程上的应用

Experimental Study on Compatibility of Monocalcium Aluminate Expansive Agent with FDN Water Reducer

铝酸钙膨胀剂与减水剂相容性试验研究

Influence of FDN Superplasticizer on the Hydration Process and Microstructure of Hardened Building Gypsum Paste

FDN减水剂对建筑石膏水化和硬化体结构的影响

FDN uses the software ( EM - Equations of Motion ) to improve the navigation function of the original system , without any other navigation hardware .

飞行力学导航法是一种在不增加硬件设备的情况下，单纯用软件（运动方程）明显改善原导航系统性能的导航方案。

The concrete strength test was conducted with the concrete made of fly ash , cement and sand plus a certain high efficient water reduction agent FDN and the orthogonal design method .

采用粉煤灰、水泥、砂石，掺加一定量的高效减水剂FDN，利用正交设计方法安排试验。

The flowability loss after 2 h was only 24 3 % , while cement paste blended with FDN had no flowability after 2 h.

2h内流动度损失仅为24%，而掺FDN的净浆已经失去流动性；

The principle of loading of digital map in the terrain auxiliary navigation is studied . It is concluded that FDN plays an auxiliary role in the process of loading of digital map .

研究了地形辅助导航中数字地图的加载原理及飞行力学导航法在数字地图加载过程中的辅助作用。

All experiments take orthogonal experiment design and each concrete mixture ratio considers five influences factors , including water cement 、 fly ash 、 silicon ash 、 FDN and the recycled coarse aggregate .

采用正交设计选定试验方案，根据水灰比大小、粉煤灰、硅灰、高效减水剂和再生粗骨料不同取代率设计不同配合比再生混凝土，对其工作性能和力学性能进行了研究。

Based on our SW theory , we propose a fast frequency domain based saliency detection model that is also biologically plausible , referred to as frequency domain divisive normalization ( FDN ) .

在SW理论的基础上，提出一个快速、具有生物可信性的基于频域的视觉注意显著性检测方法，称为频域除法归一化（FDN）。

The effect of HP , FDN moderator , fly ash on the durability of concrete . that is the performance of resisting osmose , erosion and freeze thawing .

研究了HP水溶性高分子纤维、FDN高效减水剂与粉煤灰双掺配制的高性能混凝土的耐久性（抗渗透、抗硫酸盐侵蚀、抗冻融性能）。

By investigating influence of FDN on hydra-tion process of gypsum it was found that water-reducer could accelerate the early hydration of gypsum but had almost no influence on its last hydration rate .

通过对掺有减水剂的石膏浆体水化进程的研究发现，减水剂可加快石膏浆体的早期水化，但不影响石膏的最终水化率。

The fluidity of cement paste using 0.45 % AH after 90 minutes loses only 14.7 % , while that of 0.45 % FDN after 90 minutes unexpectedly loses 100 % .

掺0.45%AH的水泥净浆经过90min的流动度损失仅为14.7%，而掺FDN的流动度损失竟达100%。

In this thesis , the author gives a new navigation scheme for the flight vehicle : Flight Dynamics Navigation Method ( FDN ) , and studies the principles of loading of digital map in the terrain auxiliary navigation .

本文论证了一种具有创新性质的导航方案&飞行力学导航法，并对地形辅助导航中数字地图的加载问题进行了研究。

The results indicate that the addition of FDN increases the strength of building gypsum significantly . When its dosage is below 1 % mass ratio , the strength of building gypsum is rapidly increased as a function of superplasticizer addition .

结果表明：FDN可显著提高建筑石膏硬化体强度，当FDN掺量在1.0%（质量分数）以内时，建筑石膏硬化体强度增长较快；