六胺

In this paper, a new method, pre-crosslinking control method, has been developed for controlling the pore structure of carbon membrane. By this method, the pore structure of carbon membrane was controlled by adjusting the fusibility of resin through varying the hexamine content used in the pre-crosslinking treatment.

在实验过程中，发现了一种调控微滤炭膜孔径的新方法，即通过改变预固化过程中六次甲基四胺的用量来控制预固化程度，从而改变成膜树脂粒子在炭化过程中的熔融特性，实现对炭膜孔径的调控，同时影响炭膜强度。

In this study, cell counting was performed by using an inverted optical microscope and a hemocytometer.

三聚氰胺的IC50值通过由六条生长曲线回归得到的代时方程计算得到。

One-pot reactions of 4 with isocyanates, triphenyl phosphine, hexachloroethane and triethylamine produced 2-anilino-5-arylidene-1-aryl-4,5-dihydroimidazo[1,2-b]-1',2',4'-triazol-4-ones 6 (or 7) in good yields.

而后用4与芳基异氰酸酯、三苯基膦、六氯乙烷和三乙胺"一锅"反应，得到4，5-二氢咪唑并[1，2-b]-1'，2'，4'-三唑-4-酮衍生物6或7。

The effects of different factors on the laser-induced graft polymerization on the PET surface were analyzed, and the mechanisms were discussed. The factors were: 1 Monomers with smaller molecules resulted in better modification than polymeric monomers. Acrylamide monomer was chosen as hydrophilic modifier finally; 2 Higher concentration of the monomer solution favored the graft reaction; 3 With the increasing laser fluence, the surface hydrophilicity of PET films increased at first, then decreased. More laser pulses led to a more hydrophilic surface; 4 Benzophenone as a photosensitizer hindered the graft polymerization; 5 The homopolymer retardant of ammonium iron sulfate hexahydrate in a proper concentration retarded the formation of homopolymers and promotes the graft copolymerization; 6 The solvent of monomer solution also affected the graft reaction. Different solvents functioned in different ways. Ethanol can promote the graft reaction because of the activity of hydrogen in its structure; 7 pH value of the monomer solution affects the polymerization rate, and a lower pH value was favorable to the graft reaction.

这些影响因素的作用分别为：1小分子单体的表面改性效果好，确定以丙烯酰胺为亲水性改性单体；2较高的单体溶液浓度有利于接枝反应；3激光能量密度增大，薄膜表面亲水性先显著增强，后又减弱；激光脉冲次数越多，改性后表面亲水性越强；4光敏剂BP对PET表面接枝聚合反应有阻碍作用；5适当浓度的均聚物抑制剂六水合硫酸铁铵能减少单体均聚物的生成，促进接枝聚合；6单体溶液的溶剂也影响接枝聚合的反应进程，不同溶剂的影响作用原理不同，含较活泼氢的乙醇能促进接枝反应；7溶液pH值影响单体聚合速率，pH值较低有利于接枝反应。

It is indicated that the acetate anion and the weak organic alkali hexamethylenetetramine play the critical role in the formation of the layered precursors at the beginning of the process.

结果表明，在上述反应中醋酸根阴离子和弱有机碱六次甲基四胺对前驱体和ZnO纳米带的形成起了关键作用。

The inhibiting ability of hexamethylenetetramine to AZ31 magnesium alloy was studied by linear sweep voltammetry and electrochemical impedance spectroscopy.

为了表征六次甲基四胺对AZ31镁合金在MgSO4溶液中的缓蚀性能，用线性电位扫描、电化学阻抗谱等方法研究了合金在溶液中的电化学行为。

Using Hexamethylenetetramine as the catalyst and P-Hydroxyanisole as the inhibitor, glycidyl methacrylate were prepared by two-step method successfully.

本论文以六次甲基四胺为催化剂，对羟基苯甲醚为阻聚剂，采用酯化闭环两步法制备出甲基丙烯酸缩水甘油酯。

With the addition of hexamethylenetetramine, an ambient pressure drying technique was developed for the fabrication of resorcinol-formaldehyde-based carbon aerogels.

以间苯二酚和甲醛为反应物、六次甲基四胺HMTA为催化剂、去离子水为溶剂，所合成的间苯二酚－甲醛凝胶能够在常压条件下直接进行干燥得到有机气凝胶；并经炭化，得到炭气凝胶。

That urine and hexamethylenetetramine taking the place of sodium carbonate as the precipitants could also produce 1D Co3O4 showed lights on understanding the mechanism of formation of 1D structures.

以六次甲基四胺、尿素等代替Na2CO3溶液作为沉淀剂，均得到了一维纳米结构的Co3O4，表明CO2-3在水镁石CoO2层间的嵌入是得到一维结构水热产物的关键。

Different morphology and size of cupric oxide nanoparticles were prepared by microwave method through changing the ratio of solution′s consistency using coppersulfate anhydrous and hexamethylenetetramine as the starting materials for the first time.

首次以无水硫酸铜(CuSO4)和六次甲基四胺(CH26N4为原料，用微波法，通过改变反应物浓度比制备出粒径和形貌不同的氧化铜纳米颗粒，并用DSC、XRD、FT-IR和TEM对产物进行了表征。

Now, however, all children continue in "comprehensive" schools, and the eleven-plus determines which courses of study the child will follow.

然而现在，所有的孩子都要在综合学校继续学习，所以这次考试只是决定他们将要学习哪些课程。

Cultivatable land , and led to a general recognition that development must not be carried at the cost of agriculture .

城区的迅速扩大在很多情况下侵占了宝贵的可耕地，使人们普遍认识到发展不能以牺牲农业为代价。