2, 2-Dimethylolpropionic acid is an intermediate for dyes and pesticides. It can be used to synthesize a series of esters and metal salts of DMPA and also be used to synthesize hindered phenolic antioxidants. DMPA can join polycondensation reaction as a dihydric alcohol.

Qualitative and quantitative analysis were carried out to determine dihydric alcohol purified from triethylene glycol residue by gas chromatorgraphy. using chromosorb GAW DMCS as carrier coated with 3% SE-31 stationary liquid, tested on a U-shape glass chromatographic column.

采用气相色谱法，以ChromosorbGAWDMCS为担体，涂3%的SE－31固定液，在U型管色谱法柱上，对三乙二醇残渣净化所得二、三、四乙二醇进行了定性定量分析。

Ester bond can be formed through the polycondensation of hard segment monomer with uniform segment length containing amide bond and dihydric alcohol, which is a better way to prepare polyesteramide.

先制备具有均一链长的含有酰胺键的硬段单体，然后与二元醇进行缩聚反应生成酯键是制备性能良好的聚酰胺酯的较好途径。

The title catalyst was used for preparing monohydric alcohol acetate, dihydric alcohol acetate and other carboxylic acid ester.

将所研制的层状表面相锆基固体酸催化剂用于一元、二元醇醋酸酯和其他羧酸酯类产品的合成，考察了其催化性能。

The Selective Protection of Dihydric Alcohol in Organic Synthesis

有机合成中二元醇的选择性单官能团保护

The method and the condition of separation epoxy ethane from dihydric alcohol are discribed.

介绍了环氧乙烷与二元醇的分离方法和条件。

Qualitative and Quantitative Analyses of Purified Dihydric Alcohol by Gas Chromatography

气相色谱法对净化二元醇的定性定量分析

The hydroxylation of phenol to produce dihydric phenol is a rapid and strongly exothermal reaction, the activity of the complex-oxide catalyst decreased rapidly.

苯酚直接羟化制备苯二酚为液固相的强放热快反应，催化剂的活性衰减很快。

The paper deals with selection of thermal isolation scheme, the project construction, checking and acceptance and effect testing in dihydric phenol project with significance for popularization.

介绍二元酚项目中保温方案的选择；保温工程的施工与验收；保温效果的测试与评价。具有推广意义。

Aluminum phosphate was prepared by solid-phase synthesis in three different templates ( organic ammonium) with aluminum chloride and ammonium dihydric phosphate at 180 ℃ for 2 h, and was characterized by XRD, IR, chemical analysis and ICPS.

用3种模板采用固相合成方法，以氯化铝和磷酸二氢铵为原料合成了磷酸铝，产物经XRD，IR，化学分析和ICPS表征。

As for wine of higher salt content, ammonium dihydric phosphate ( NH4H2PO4) was used as background modifier to eliminate the interference of NaCl.

对含盐量较高的酒，添加磷酸二氢铵作基体改进剂，可消除盐分的影响。

The aluminium dihydric phosphate coating is prepared and the properties of high temperature resistance, thermal shock resistance and abrasion resistance are studied.

试验制备磷酸二氢铝胶粘涂层，并测试了其耐高温，抗热震，耐磨等性能。

Preparation of cheap aluminium dihydric phosphate and its application in refractories

廉价磷酸二氢铝的制备及在耐火材料中的应用

The deduction of the helix plane equation in molecule and the common applying of dihedral angle

分子中螺旋平面方程的推导与二面角的一般应用

The determination of dihedral angle is of extensive significance in the fields of metal materials science and metallurgy.

两面角的测定在金属材料、冶金等领域具有广泛的意义。

A Simple and Convenient Solution of the Dihedral Angle Between the Oblique Inserted Pipes

斜插管两面角的简便解法

The adjustment of the polarization dihedral angle for the antenna of earth stations

地球站天线极化夹角的调整

The another class of inequality about e~ n spatial dihedral angle

E~n空间二面角的另一类不等式

Automatic constructing triangular surface and mesh simplification based on dihedral angle.

三角网格模型的自动化建模及基于二面角的网格简化。

Using dihedral angle series of protein for protein structure comparison

利用蛋白质的二面角序列对蛋白质结构比对

Dihedral group ( I_2 ( m)) and Coxeter group of group H_3, H_4) are noncrystallographic in irreducible finite Coxeter group.

根据分类，非Weyl群的不可约有限Coxeter群有二面体群I2（m）和群H3，H4。