查询词典 formaldehyde solution

Necessary and sufficient conditions for the existence and the expressions of selfconjugate solution, perselfconjugate solution, centrosymmetric solution, bisymmetric solution, skewselfconjugate solution, skewperselfconjugate solution, skewcentrosymmetric solution, and skewbisymmetric solution to 4 kinds of systems of linear matrix equations over a regular ring with an involutorial antiautomorphism are given.

利用矩阵技巧和所建立的矩阵理论，给出了正则环上五类矩阵方程组有解的若干充要条件和一般解的表达公式。这些矩阵方程组除了它们在理论上有重要的意义外，还有重要的应用价值。在具有对合反自同构的正则环上，给出了四类矩阵方程组有双对称解，中心对称解，斜中心对称解，广自共轭解，斜广自共轭解，自共轭解以及斜自共轭解的充要条件及其这些解的具体表达式。

By using constructive methods and complicated techniques of matrices, necessary and sufficient conditions for the existence of selfconjugate solution, perselfconjugate solution, centrosymmetric solution, bisymmetric solution, skewselfconjugate solution, skewperselfconjugate solution, skewcentrosymmetric solution, skewbisymmetric solution and various interlaced solutions over a finite central algebra Ω to systems of generalized Sylvester matrix equations overΩ are presented.

利用构造方法和复杂的矩阵技巧，研究了有限维中心代数上的多项式环Ω上的广义Sylvester矩阵方程组在Ω上有自共轭解，斜自共轭解，广自共轭解，斜广自共轭解，中心对称解，斜中心对称解，双对称解，斜双对称解及其各种交错解的充要条件。

Urea-formaldehyde resin adhesives are widely used in the production of plywood because of their good adhesiveness and low cost, but the problem of formaldehyde released from UF has attracted more and more attention. Therefore, the study and use of environmental friendly resin adhesives containing no formaldehyde become to be the focus of the researches.

脲醛树脂由于其良好的粘接性能及较低的生产成本被广泛应用于胶合板的生产中，但其甲醛释放问题却引起越来越多的关注，因此开发使用无醛的绿色环保型胶粘剂就成为目前胶粘剂研究工作的核心。

Methanol can be further processed to hundreds of organic products, such as formaldehyde, MTBE, acetic acid, sodium methoxide, chloromethane , methyl formate, formamide, 2-methyl formamide etc., the demand for those will be expand in future:① in 2000, the production of formaldehyde is 2,068,000 tons, along with our country continue reinforce the infrastructure, the consumption of formaldehyde will increase rapidly.

甲醇可深加工的有机化工产品有上百种，如甲醛、 MTBE、醋酸、甲醇钠、氯甲烷、甲酸甲酯、甲酰胺、二甲基甲酰胺等等，预计这方面的需求今后会有适度发展：① 2000年我国甲醛产量达206.8万吨，近年随着我国基本建设的不断加强，甲醛消费量增长迅速。

Then formaldehyde attenuation curve which purification products reduce 5~10 times formaldehyde were tested, which has been tested at 1 m^3 environment deck according to experiment condition of eliminator standard GB/T18801-2002. Moreover, purification quantity per hour was computed by mathematics line integral surface. Results: The purification quantity which formaldehyde has been purificated by kieselguhr material was 1.44 mg/m^2h.

本研究选用了硅藻土和光催化两种原理空气净化材料，以室内空气常见的污染物甲醛为目标，参照国家空气净化器标准(GB/T18801-2002)中的实验条件，在1立方公尺环境测试舱内分别发生室内空气质量标准10倍的甲醛气体，测试净化产品对甲醛衰减曲线，运用数学曲线积分面积的计算模式来计算单位时间净化量。

Several factors affecting the synthesis of urea-formaldehyde resin adhesive,including formaldehyde to urea molar ratio,urea adding method,pli value,reaction temperature,reaction time,were discussed and several modifications of urea-formaldehyde resin were also compared.

介绍了脲醛树脂胶粘剂的研究现状与进展方向。探讨了影响脲醛树脂胶粘剂合成的主要因素，包括甲醛-尿素摩尔比、加料方式与顺序、pH值、反应温度和反应时间等，并比较了不同的改性方案。

An anionic phenol-formaldehyde resin which synthesized by phenol, formaldehyde and some amine compound such as diethylamine, triethylamine and diethylene triamine was studied in this paper, and this modified phenol-formaldehyde resin was used in papermaking as an intensifier.

本文通过苯酚、甲醛与胺类化合物(二乙胺、三乙胺、二乙烯三胺)反应，得到阴离子性的酚醛树脂，并研究了将改性的酚醛树脂作为造纸增强剂应用在抄纸过程中。

Main connections are methenyl ether linkage and methenyl. From the end of heat preservation to the end of whole reaction, main reaction was polycondensation. In general, there were three types reaction among melamine modified UF resin, urea-formaldehyde system, melamine-formaldehyde system and melamine-urea-formaldehyde system.

保温反应结束直到整个反应结束，缩聚反应为主要反应类型，三聚氰胺改性脲醛树脂中存在着3种反应体系：尿素甲醛的反应体系、三聚氰胺甲醛反应体系和三聚氰铵尿素甲醛共缩合反应体系。

Methods: in the light of the introduction of national standards "The analytical methods of zymolytic alcohol healthful standard" measured formaldehyde content of the food; and according as the national standard methods of measuring sulfur dioxide content of the food to determine food formaldehyde or sodium formaldehyde sulfoxylate content.

参照采用国家标准《发酵酒卫生标准的分析方法》，测定食品中甲醛的含量；再按国家标准方法测定食品中二氧化硫的含量，以判断食品中甲醛或吊白块的含量。

An anionic phenol-formaldehyde resin which synthesized by phenol, formaldehyde and diethylene triamine was studied in this paper, and this modified phenol-formaldehyde resin was used in papermaking as an intensifier.

结果表明，单独使用改性酚醛树脂时增强效果不显著；改性酚醛树脂和阳离子淀粉共同使用能有效提高纸张的抗张指数和环压指数。

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。