查询词典 furan

The urea-formal dehyde resin, polyurethane resin and SiC sand were used to modify the furan resin sand respectively.

分别采用脲醛树脂、聚氨酯及SiC原砂作添加剂，对呋喃树脂砂进行改性。

Three types of catalysts, ZSM-5, Al2O3, SiO2-Al2O3, were prepared and their catalytic performances for the reaction of furan with ammonia to product pyrrole was studied.

本文制备了ZSM-5、Al2O3 、SiO2-Al2O3三种类型的固体酸催化剂，并通过在常压固定床反应器中进行的氨与呋喃合成吡咯的反应对三种催化剂的性能进行了研究。

Company Product and its annual output to 12,000 tons Furfuryl / year, Furan Resin 5,000 tons / year, 5,000 tons of acrylamide solution / year, 2,000 tons of acrylamide Crystal / year, polyacrylamide Dry powder 1,000 tons / year.

企业主要产品及其年产量为糠醇12000吨/年，呋喃树脂5000吨/年，丙烯酰胺溶液5000吨/年，丙烯酰胺晶体2000吨/年，聚丙烯酰胺干粉1000吨/年。

Preparation of THF using hydrogenation of furan and catalyzation of raney ni ;...

raney ni 催化呋喃加氢制备四氢呋喃的研究。。

The thermodynamic function data, including total energy, enthalpy, entropy, free energy and constant volume molar heat capacity for dibenzo-furan and 135 polybrominated dibenzo-furans, were predicted by fully optimized calculation and frequency analysis at the B3LYP/6-31G* level.

在B3LYP/6-31G*水平上对二苯并呋喃和135个多溴二苯并呋喃系列化合物进行了全优化计算和振动分析，得到各分子的总能量、焓、熵、自由能和恒容热容，研究了这些参数与溴原子的取代数目及取代位置的关系。

It should perhaps be noted that trehalose has a much more static structure than the reducing sugars, due to its lack of mutarotation, or the other common non-reducing disaccharide, sucrose, due to its lack of a furan ring .

它也许应当指出海藻糖具有更比还原糖静态结构，缺乏变旋，或其他常见的非减糖、蔗糖、缺乏一个呋喃环。

They are 4-(2- hydroxy-3-butynlenoxy) benzoic acid (1, WA), 5-chloro-7, 8-dihydroxy-7-methyl- 6-oxo-3- [ -3, 4-dihydroxy-3, 5-dimethyl-l-heptylene] -1H-8, 8a-dihydrobenzo [2, 3-c] pyran (2, WB),-2-(2-methyl-2-dibutene diamido)-2-butenoic acid (3, B5262), 3, 4-dihydro-9, 10-dihydroxy-7-methoxy-3-methyl-1H-naphtho [2, 3- c] pyran-1-one (4, A73 semi-Vioxanthin), 8, 8'-bis (6, 9-dioxo-3,4-dihydro-10- hydroxy-7-methoxy-3-methyl-1H-naphtho [2, 3-c] pyran-1-one)(5, A122 Xanthomegnin), 2, 5-dioxo-3a-hydroxymethyl-3, 3a, 6, 6a-tetrahydro-furo [2, 3-b] furan (6, 1003-2), 7-acety1-5-chloro-6, 8-dioxo-7-methyl-3- [ -3, 5-dimethyl-1, 3- diheptylene] -4aH-benzo [2, 3-c] pyran (7, M2-2 sclerotiorin), respectively.

它们分别被命名为4-（2-羟基-3-丁炔氧基）苯甲酸（1，WA）、5-氯-7，8-二羟基-7-甲基-6-氧代-3-[-3，4-二羟基-3，5-二甲基-1-庚烯基]-1H-8，8a-二氢苯并[2，3-c]吡喃（2，WB）、-2-（2-甲基-2-丁烯二酰亚胺基）-2-丁烯酸（3，B5262）、3，4-氢-9，10-二羟基-7-甲氧基-3-甲基-1H-萘并［2，3-c］吡喃-1-酮（semi-Vioxanthin，4，A73）、8，8'-双（6，9-二氧代-3，4-二氢-10-羟基-7-甲氧基-3-甲基-1H-萘并［2，3-c］吡喃-1-酮）（Xanthomegnin，5，A122）、2，5-二氧代-3a-羟甲基-3，3a，6，6a-四氢-呋喃并［2，3-b］呋喃（6，1003-2），7-乙酰基-5-氯-6，8-二氧代-7-甲基-3-［-3，5-二甲基-1，3-庚二烯基］-4aH-苯并2，3-c］吡喃（Sclerotiorin，7，M2-2）。

Under the influence of an external electric field defined by Sparkles, wecomparatively study the molecular structures and NLO responses of the push-pull thiophene quinoid molecules, push-pull furan quinoid molecules and push-pull pyrrole quinoid molecules. The results make known that the relative size ofthe molecular polarizability values for the three quinoid-type molecules dependson the selection of the donor-acceptor pairs.

比较研究了推-拉噻吩醌型分子、推-拉呋喃醌型分子以及推-拉吡咯醌型分子在点电荷外加电场作用下的分子结构和NLO响应，结果表明：这三种分子超极化率的相对大小取决于给体-受体对的选择。

Pingxiang Chemical industry is professional foundry molding materials research and development,production and sales and technical services,one of high-tech enterprises,Main production and sale of foundry furan resin,curing agent,casting coating,sand core binder,release agent,filtering films and modeling materials and related products.

平祥化工是一家专业从事铸造造型材料研究开发、生产销售和技术服务的高科技型企业，主要生产销售铸造用呋喃树脂、固化剂、铸造涂料、砂芯粘结剂、脱模剂、过滤片等造型材料及相关配套产品。

The furan resin for casting produced by our factory has a complete category,which has acid hardening self-hardening sand adhesive under normal temperature and thermal setting adhesive.

我厂生产的铸造用呋喃树脂品种齐全，有常温下酸固化自硬砂粘结剂和热固法粘结剂。

The circulation, consumption and reproduction of the trilogy have not only testified to its historical significance and literariness, but also invested it with new meanings.

该三部曲的流通、消费与再生产不仅验证了其历史意义及文学性，而切还赋予它以新的意义。

If he thought that he could buy me off, he would be wrong.

如果他认为他可以收买我，那他就大错特错了。