查询词典 sieve

The results showed that the acidities of 13X molecular sieve and mordenite by CVD were unchanged, and the relationship between SiO〓 deposition and contraction of pore diameter was determined.

在HMC-60催化剂上，140-156℃范围反应均为一级，表观活化能为1.75KJ/mol，频率因子A=5.314×10〓，反应速率与温度的关系为k=5.314×10

In the technical scheme of the invention, reactant, ammonia and hydrogen peroxide are ordinally added into the reaction system of catalyst containing Ti-MWW-F molecular sieve and solvent, and after stiring, temperature raising and reaction are finished, an oxime product is produced by filtering, distillation, liquor filtering and separation.

本发明的技术方案是将反应物酮或醛、氨、过氧化氢依次加入到含Ti-MWW-F分子筛的催化剂和溶剂的反应体系中，搅拌，升温，反应结束后，经过滤，蒸馏滤液，分离得到产物肟。

The AlPO4-5 molecular sieve has been synthesized hydrothermally by using tripropylamine as the template, and pseudoboehmite and orthophosphoric acid as aluminum and phosphorus sources, respectively.

以拟薄水铝石作为铝源，正磷酸为磷源，正三丙胺作模板剂，采用水热法合成了AlPO4-5分子筛。

The experiments were conducted in a distillation column simulator with sieve trays by using air and mixtures of liguid paraffine and water.

以空气和油、水混合物为介质，在冷模塔内进行筛板上气、液、液三相流动的操作工况及其转变的研究。

Experimental materials include CO2 incubator,M199, fetal calf serum,Ⅳ collagenase, 40 g/L of paraform, 20 g/L of cidex,ECGF, mouse-anti-human FⅧ monoclonal antibody(anti-FⅧ-RAg), multi-marked immune analyser(1 420, WALLAC BLCTOR2), centrifuge, inverted microscope, and immunofluorescence microscope, etc.METHODS: Three-step gradient sieve method was used.

实验材料为CO2培养箱，M199，胎牛血清，Ⅳ型胶原酶，40 g/L多聚甲醛，20 g/L戊二醛，ECGF，鼠抗人第八因子单克隆抗体，多标记免疫分析系统(1 420，WALLAC BLCTOR2)，离心机，倒置显微镜，免疫荧光显微镜等。

Meanwhile, different pesticidal approaches were implemented to sieve some effective control methods.

同时采取不同施药防治措施，筛选合理有效的防治方法，结合林业防治管理技术，对害虫种群进行综合控制。

The synthetic route starts from penicillin G, peroxyacetic acid(8.5%) as Oxidizing Agent to get penicillin G sulfoxide; esterifided with p-nitrobenzyl bromine to synthesize penicillin G sulfoxide ester; we synthesize 3-exomethylenecepham sulfoxide ester with phthalimide potassium and 4A molecular sieve as acid scavenger to open the ring, SnCl_4 as catalyzation to close the ring. The yield is over 60%.

本研究采用的合成路线为：以青霉素G钾盐为原料，选用工业过氧化氢制备的过氧乙酸(22.3%)稀释至8.5%为氧化剂，氧化得青霉素亚砜；采用对硝基溴苄为酯化试剂，制备青霉素亚砜酯；以NCP(N-氯代邻苯二甲酰亚胺)为开环试剂，酞酰亚胺钾和4A型分子筛为酸清除剂，顺利开环；再经无水SnCl_4催化闭环得3-环外亚甲基头孢亚砜酯，最终产率在60%以上。

This observation provided a strong support to the point that most leaves export the most of assimilates in the light time. Plasmodesmal densities between SE/CC, CC/PP, PP/PP and PP/BSC (bundle-sheath cell) decreased in weak light. Plasmodesmata were observed between CC/SE (nacreous-walled sieve element), PP/BSC in branch veins in normal light intensity, but not in weak light. Thus apoplasmic pathway may be the main mode of transport of assimilates in weak light, however symplasmic pathway may be the main mode of transport of assimilates in normal light intensity.

在筛管/伴胞、伴胞/韧皮薄壁细胞、韧皮薄壁细胞/韧皮薄壁细胞和韧皮薄壁细胞/维管束鞘细胞之间的胞间连丝密度都在弱光条件下下降，在正常光照强度下支脉筛管/伴胞和韧皮薄壁细胞/维管束鞘细胞之间可以观察到胞间连丝，而在弱光下几乎观察不到胞间连丝的存在，所以同化物的运输在弱光条件下可能以质外体运输为主，而在正常光照强度下，共质体运输可能是主要的运输方式。

Effect of grinding aids on grinding efficiency of Portland cement,slag cement and pozzuolana cement was evualated by adopting indexes such as residue of sieve,specific surface area and size distribution.Some references were provided for the selection of grinding aids by comparision test and results analysis.

选取了立窑和回转窑2种熟料，在同一试验条件下掺入不同种类及掺量混合材磨制成若干个试样，并采用筛余、比表面积及粒度分布等指标来评价助磨剂对普通硅酸盐水泥、矿渣水泥和火山灰水泥粉磨效率的影响，并进行了对比研究，通过作用效果的分析，为助磨剂的选用提供了参考依据。

The reaction results of the selective hydrogenation of MethylAcetyleneand Propadiene in C 3 distillate by catalytic distillation were investigated with randomlypacked structure of packingtype catalyst, the combined structure of sieve tray and packingtype catalyst as well as the structure with interlaced packing and ordinary catalyst.

考察了填料状催化剂散装结构、筛板填料状催化剂复合结构、规整填料与普通催化剂交错排列结构等用于C3 馏分中丙炔、丙二烯催化蒸馏选择加氢过程的反应效果，综合考虑催化剂制备的难易、工业装置长周期运转的必要性、传质对反应的影响等因素，推荐在工业装置上采用规整填料与催化剂交错排列结

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐