查询词典 sieve analysis

Polytetrafluoroethylene wide aperture sieve plate was prepared by machining PTFE turning plate, and the tensile properties of sieve plate and turning plate were analyzed.

采用聚四氟乙烯车削板为原料，机械加工生产大孔径PTFE筛板，对筛板与车削板进行了拉伸性能分析。

The blood flow of sieve plate and retina in macula is significantly decreased in CSC, and there is positive correlation between hemodynamic parameters of sieve plate and retina in macula.

中浆患者的视盘筛板和黄斑部视网膜血流下降显著，且两者血流动力学改变存在正相关性。

It has a nucleus, dense cytoplasm, and many mitochondria, and is thought to provide, Via PLASMODESMATA, the needs of the less metabolically active, enucleated sieve element and perhaps plays a role in regulating the flow of metabolites through the sieve tube.

伴胞具有细胞核和浓厚的细胞质，还有大量的线粒体提供能量。筛管分子去除细胞核，仍能生活，可能与伴胞的存在有关。

The Company are the production of drum sieve sieve professional enterprises, engaged in more than 20 years.

本公司是生产筛板筛鼓的专业性企业，从事20多年。

The invention discloses a dielectric hole-microhole composite material and synthesizing method in the inorganic porous material, adsorbing material and catalytic material technical domain, which comprises the following steps: adopting zeolite molecular sieve as raw material; reacting with sodium bisilicate solution under 30-60 deg.c for 10-300 min; disintegrating particle part of zeolite molecular sieve into piece with microhole structure; adding cetyl trimethyl ammonium bromide as molder; adjusting pH value of mother liquid to 10-12; aging 1-8h; adding in the high-pressure autoclave to do water heat synthesizing reaction at 80-130 deg.c for 24-72h; separating solid; washing; drying; sintering under 500-600 deg.c for 5-10h; obtaining the Si-Al porous material with dielectric hole and microhole composite structure.

本发明属于无机多孔材料、吸附材料和催化材料技术领域，涉及具有介孔-微孔复合材料及其合成方法。其特征是以沸石分子筛为原料，用偏硅酸钠的水溶液在30～60℃反应10～300分钟，使沸石分子筛的颗粒部分解离形成具有微孔结构的碎片，加入模板剂十六烷基三甲基溴化铵，然后调节母液pH值为10～12，老化1～8小时，然后加入高压釜于80～130℃进行水热合成反应。反应24～72小时后，分离出固体，水洗、干燥，然后于500～600℃焙烧5～10小时，得到具有介孔和微孔复合结构的硅铝多孔材料。本发明的效果和益处是所发明的合成方法可用于合成多种沸石结构和介孔结构的复合材料，所合成的材料经过质子交换可以具有较强的酸性，在吸附和催化领域具有广泛应用前景。

The molecular sieve is prepared in the steps: at the room temperature, hexadecyl trimethyl ammonium bromide is mixed and dissolved with the sodium hydroxide, and is added with TEOS in dropping way, and simultaneously added with Me metal salt water solution and lanthanum nitrate solution in dropping way; the pH value of the mixed solution is adjusted by acetic acid to be 10 to 11, and is mixed for 1 to 2 hours after being stabilized; the sol is moved into a polyfluortetraethylene bottle to be heated and crystallized for 2 days in the oven at the temperature of 100 DEG C; after filtering, washing and drying for nights, and being calcined in a muffle at the temperature of 550 DEG C for 3 to 7 hours, the dual-metal-atom improved MCM-41 mesoporous molecular sieve is obtained.

该分子筛的制备为室温下，将十六烷基三甲基溴化铵和氢氧化钠混合溶解，搅拌并滴加入TEOS，同时滴加入Me金属盐水溶液和硝酸镧溶液并搅拌，用乙酸调节pH值至10～11，稳定后搅拌1～2小时，溶胶转入聚四氟乙烯瓶中在100℃下烘箱水热晶化2天，经过滤、洗涤、干燥过夜，马弗炉550℃焙烧3-7h，得双金属原子改性MCM-41介孔分子筛产品。

The invention adopts the technical proposal that the nucleation and process of growth of the molecular sieve are controlled properly in the synthetic process of the ZSM-5 molecular sieve material for producing the Magadiite/ZSM-5 intergrowth material, wherein the proportion of intergrown phases is adjustable, and the synthesized Magadiite/ZSM-5 intergrowth material adopts the compositions including the following mole relation: nSiO2:Al2O3, where n is between 50 and 1000 in the formula, and the method is characterized in that the Magadiite/ZSM-5 intergrowth material has two intergrown phases and an XRD diffraction pattern thereof has the d-space maximum value at the lengths of 15.73+-0.1, 11.14+-0.1, 9.97+-0.1, 7.74+-0.1, 5.14+-0.1, 3.86+-0.05, 3.66+-0.05, 3.45+-0.05, 3.30+-0.05 and 3.14+-0.1 angstroms, thereby solving the problems properly.

本发明通过采用在ZSM-5分子筛材料合成过程中，控制好分子筛的成核和生长过程，制备出了一种Magadiite/ZSM-5共生材料，其中共生物相比例可调，合成的Magadiite/ZSM-5共生材料采用包括以下摩尔关系的组成：nSiO2∶Al2O3，式中n＝50～1000，其特征在于所述Magadiite/ZSM-5共生材料具有两种共生物相，其XRD衍射图谱在15.73±0.1，11.14±0.1，9.97±0.1，7.74±0.1，5.14±0.1，3.86±0.05，3.66±0.05，3.45±0.05，3.30±0.05，3.14±0.1埃处有d-间距最大值的技术方案，较好地解决了上述问题。

The difference of blood capillary caliber in nipple prompts ischemic lesions occur easily in sieve plate prezone and sieve plate district.

视乳头各层毛细血管口径不同，提示筛板前区及筛板区容易发生缺血性病变。

The invention relates to a synthesis method for an SAPO molecular sieve, which mainly solves the problems of low crystallinity and poorer performance of the SAPO molecular sieve in the prior art.

本发明涉及一种SAPO分子筛的合成方法，主要解决现有技术中SAPO分子筛结晶度低、性能较差的问题。

It is a new technique to synthesize SAPO 34 molecular sieve using cheap triethylamine (Et 3N) as the template, and the selectivity of this molecular sieve for ethene and propene can be improved further.

采用X射线衍射、扫描电镜、氨吸附红外光谱及核磁共振等表征手段，研究了以氟化氢三乙胺为复合模板剂合成的SAPO 34分子筛。

We are forbidden from giving money to these shoeless, skinny children, as this will perpetuate begging.

向光着脚，骨瘦如柴的孩子施舍是不可以的，因为要招来无休无止的乞讨。

It would be hard not to fall victim to some sharpeyed policeman.

要想不被某个目光锐利的警察抓到，谈何容易。