查询词典 ethylene

A novel non - metallocene supported catalyst, CpTiCl2/MgCl2 - SiO2/ MAO ,was prepared, and the catalysis involved in ethylene homo - polymerization, ethylene - 1 - hexylene and ethylene - styrene copolymerization was investigated.

研究开发了一种新型非茂负载聚烯烃催化剂——CpTiCl2/MgCl2-SiO2/MAO，并考察了该催化剂的乙烯均聚、乙烯和1-己烯共聚及乙烯和苯乙烯共聚性能。

Results showed that the kinetics of photocatalytic degradation of ethylene by TiO2/ACF desoposited Pt in the simulated cold storage environment for horticultural products could be described using the pseudo first-order equation. The prepared TiO2/ACF-Pt, in the process of which Pt was initially deposited on the surface of ACF and then TiO2 was coated, would promote the activity of ethylene decomposing. When ion sputtering time was 60 seconds (Pt/Ti atomic concentration ratio was 0.112), the apparent rate constant of the reaction of TiO2/ACF-Pt was 1.16 times as much as that of TiO2/ACF. The micrographic structure of ACF was not damaged and an excessive porous structure, which was contributive to absorbing the diluted ethylene, was obtained by the way of ion sputtering Pt.

结果表明：在模拟园艺产品冷藏环境中，TiO2 /ACF-Pt光催化降解乙烯的动力学可用表观一级速率方程来描述；ACF表面先溅射沉积Pt，再进行TiO2附着方案，能提高降解乙烯的能力，当溅射时间为60 s（Pt/Ti原子浓度比为0.112）时，表观一级速率常数是未溅射Pt的1.16倍；TiO2/ACF-Pt的制备方法，对ACF形貌结构没有破坏，并能得到有利于对微量乙烯的吸附的多孔结构。

The crystallization behavior of polyethylene terephthalate ; random poly (ethylene/tetramethylene terephthalate) P (ET/BT ; poly (ethylene terephthalate/ isophthalate) P (ET/EI and poly (ethylene terephthalate/adipate) P (ET/EA copolyesters; and block polyethylene terephthalate/polyethylene glycol and polyethylene terephthalate/polytetramethylene glycol were studied by DLI ; DSC; WAXD; PLM and IR technique.

本文通过缩聚反应合成了不同分子量的聚对苯二甲酸乙二酯；聚对苯二甲酸酯P(ET／BT、聚（对苯二甲酸／间苯二甲酸）乙二醇酯P(ET／EI和聚乙二醇酯P(ET／EA等系列的无规共聚酯以及PET／PBG和PET／PEG等系列的嵌段共聚酯，并采用DLI、DSC、WAXD、IR和NMR等实验技术着重研究了它们的结晶行为与共聚酯的序列结构。

The crystallization behavior of polyethylene terephthalate ; random poly (ethylene/tetramethylene terephthalate) P (ET/BT ; poly (ethylene terephthalate/ isophthalate) P (ET/EI and poly (ethylene terephthalate/adipate) P (ET/EA copolyesters; and block polyethylene terephthalate/polyethylene glycol and polyethylene terephthalate/polytetramethylene glycol were studied by DLI ; DSC; WAXD; PLM and IR technique.

中文题名PET及其共聚酯的结晶行为副题名外文题名 The crystallization behavior of PET and its copolyesters 论文作者边界导师封麟先叶胜荣教授学科专业高分子化学与物理研究领域\研究方向学位级别博士学位授予单位浙江大学学位授予日期2001 论文页码总数10，159页关键词聚对苯甲酸乙二酯聚酯结晶馆藏号BSLW /2003 /O633 /1 本文通过缩聚反应合成了不同分子量的聚对苯二甲酸乙二酯；聚对苯二甲酸酯P(ET／BT、聚（对苯二甲酸／间苯二甲酸）乙二醇酯P(ET／EI和聚乙二醇酯P(ET／EA等系列的无规共聚酯以及PET／PBG和PET／PEG等系列的嵌段共聚酯，并采用DLI、DSC、WAXD、IR和NMR等实验技术着重研究了它们的结晶行为与共聚酯的序列结构。

The first grade is 14.7cm/kg, the fifth is 3.2cm/kg, and the sixth is lower than 2.0 cm/kg.Linked the Paull's(1996) conclusioned that the ethylene quantity was fewness at the first grade, and toped at the third to four grade, then droped rapidly, but the papaya fluit neither had the best flavor,nor became mature completely when ethylene quantity was tiptop.So we used the rigidity standard not the ethylene quantity to choose specimen.

将采后番木瓜果实按果皮颜色可分为六级，其中一级硬度为14.7 kg / cm2，六级为2.0 kg / cm2 ，结合Paull（1996）对采后番木瓜乙烯变化的结论：乙烯含量在果色破色前最微，到开始变软时达到高峰以后迅速下降，而此时番木瓜还没有达到食用风味最佳，也没有达到成熟，因此相比而言我们使用硬度为指标进行选择比较方便可行。

The result showed that the ethylene content in upper organ of ramie plant is higher than in lower organ. The ethylene content in leaf and stem apex is higher than flower bud. The ethylene content in ramie plant with female flower is higher than ramie plant with androgynary in stem apex, leaf and flower.

结果表明：乙烯在苎麻体内分布总趋势是自上而下依次减少，上中部器官乙烯含量大于下部器官，其中茎尖和叶片乙烯含量大于花芽，性别表现为雌性的苎麻在茎尖、叶和花芽中的乙烯含量都大于性别表现为两性的苎麻。

The ethylene release rate was measured in shoot tip of different sex ramie in different time, the budof same node in female and hermaphrodite ramie in second crops and different sex singleinflorescence in hermaphrodite ramie. The result indicated there was closed relationship betweensexual different ramie and ethylene release rate. The female ramie could be induced by highethylene release rate. the ethylene content in ramie plant with female flower is higher than ramieplant with androgynary in stem apex, leaf and flower.

5对不同性别苎麻茎尖乙烯释放速率、不同性别苎麻材料不同节位花芽乙烯释放速率、雌雄同株苎麻的雌花序、雄花序和雌雄混合花序的乙烯释放速率进行测定，同时对外施乙烯抑制剂(AVG和AgNO_3)对苎麻性别的控制进行研究，表明苎麻性别分化与内源乙烯密切相关，高水平乙烯释放速率诱导雌株苎麻或雌花的产生。

The o-aminobenzaldehyde ethylene acetals can be synthesized from corresponding o-nitrobenzaldehyde by reducing the nitro-group after the protection of carbonyl by ethylene. 2-Aminophenyl ketone ethylene ketal can also be prepared from 2-nitrophenyl ketones by this method.

邻氨基苯甲醛乙二醇缩醛可以由含不同取代基的邻硝基苯甲醛经羰基以乙二醇缩醛保护后还原硝基得到，邻氨基芳香酮乙二醇缩酮可以同样的方法由邻硝基芳香酮得到。

Huang-hua' pear fruit was a typical climacteric fruit after harvest, and the fruit senescence-related factors, such as LOX activity, 02" content, AOS activity, ACC synthase activity, ACC content, ACC oxidase activity and ethylene production, changed with peaks at 20 "C. The activities of LOX, AOS, ACC synthase, ACC oxidase and the accumulation of O2 ", ACC content and ethylene synthesis were inhibited when stored at 1癈. And the severity of flesh floss and fruit decay was lightened. Low temperature combined with polyethylene film bag packing (PEF1 and PEF2) could further decrease the rate of weight loss, flesh floss, and fruit decay and keep preferable freshness. When PEF1 and PEF2 packing fruits were transferred to shelf life at 20 "C after storage at 1癈. The activities of LOX, AOS, ACC synthase, ACC oxidase could be suppressed and the accumulation of 02 , ACC content and ethylene production were slowed down to a certain extent, especially during the shelf life after 60 d storage. PEF1 and PEF2 packing fruit could maintain higher firmness as well, and the effects became more distinct along with the storage period, there existed no significant difference between PEF1 and PEF2 treatments.

试验结果表明，在20℃下，LOX活性、O2-水平、AOS活性、ACC合成酶活性、ACC含量、ACC氧化酶活性及乙烯的生成，均呈峰形变化；1℃处理可抑制LOX、AOS、ACC合成酶、ACC氧化酶的活性和O2-、ACC的积累，抑制贮藏果实的乙烯合成，减轻果肉发绵和果实腐烂。1℃下贮藏的果实，若结合不同聚乙烯薄膜袋(PEF1和PEF2)小包装，可以进一步降低果肉发绵率和果实腐烂率，保持果实新鲜度；当果实经过一段时间贮藏后，转移到20℃下，在货架期间，PEF1和PEF2对果实成熟衰老各个相关因子均有不同程度的抑制效应，主要表现在贮藏60d后的货架期间，同时维持较高的果实硬度，对硬度的影响随着贮藏时间的延长愈加明显，PEF1和PEF2处理效果之间无显著差异。

The ethylene producing process includes: distilling 5-45 % concentration ethanol solution to obtain mixed ethanol-water vapor, heating the mixed ethanol-water vapor to 150-350 deg.c, catalytic reaction in a gas-solid reactor to obtain coarse ethanol product, cooling, gas-liquid separating to eliminate components with boiling point higher than 70 deg.c and obtain ethylene gas, and washing, drying and refining to obtain ethylene product.

其特征是将乙醇蒸馏和化学催化制乙烯工艺过程耦合，浓度为5～45％乙醇经蒸馏系统得到乙醇-水混合蒸气，该乙醇-水混合蒸气继续加热到150～350℃后进入气-固催化反应器中经催化剂作用得到产物为粗乙烯，粗乙烯冷却后，使用气液分离装置去除其中沸点大于70℃组分得到乙烯气体，乙烯气体依次通过洗涤、干燥和精制得到乙烯产品。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。