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Results indicate that the optimum extraction conditions are as follows: ultrasonic power is 600W, temperature is 53℃, the ratio of liquid to solid is 8︰1, ultrasonic treating time is 70min, reflux extraction time is 120min, the extraction rate of oleanolic acid is 3.000 mg/g; XDA-1 resin is favorable in purification of OA in Chaenomeles sinensis Koehne, the optimum purification conditions are found to be 0.794 mg/mL of OA concentration, the flow rate of adsorption is 0.5 mL/min; the desorption solvent is 90% ethanol, and the flow rate of elutant is 1.0 mL/min.

结果表明,超声波辅助提取最佳工艺条件为:超声功率600 W、提取温度53℃、液料比8:1、超声波提取70 min,回流提取120 min,齐墩果酸得率为3.000 mg/g;XDA-1型大孔树脂对齐墩果酸具有较好的吸附和解吸效果,最佳纯化工艺条件为上柱液浓度0.794 mg/mL,吸附流速0.5 mL/min;以90%浓度乙醇洗脱,洗脱流速1.0 mL/min,纯化后得提取物中齐墩果酸纯度可达26.55%。

The optimum synthetic conditions of ethyl chloroacetate are: molar ratio of chloroacetic acid to ethanol is 1:8, the quantity of catalyst[Fe2(SO4)3 xH2O] is 10% of the mass of chloroacetic acid, reaction time is 1 hour, 5A zeolite was used as dehydrating agent. In these conditions, the yield of ethyl chloroacetate was up to 73%.

用Fe_2(SO_4)_3·xH_2O作为催化剂合成氯乙酸乙酯的较佳反应条件是:酸醇物质的量之比为1:8,催化剂用量为氯乙酸质量的10%,以5A分子筛作为脱水剂,回流时间1h,收率达73%以上。

The factors affect on the degree of substitution of product, yield and apparent viscosity, such as the mol rates of EPTAC with -NH2, reaction temperature, reaction time and the content of water in system have been discussed in detail. FTIR spectrometer and UV spectrometer are used to characterize the structure of the derivative and it is proved that substitution reaction mainly occurs on the -N element .The particle size and morphology of chitosan and quantemary ammonium salt of chitosan are analysised by comparing photos of their scanning electron microscope. The degree of substitution of HACC is determined by acid -base conductometric titration. An error in current formula of DS has pointed out and a correct formula has presented.On the base of experience of above experiment, the reaction conditions of HACC were systematically investigated through orthogonal design, and then the best conditions are found. Water-solubility and dependence of pH are studied.

壳聚糖和环氧丙基三甲基氯化铵在异相条件下发生反应,通过单因素实验,制备了一系列不同性能的壳聚糖季铵盐,本文首次详细讨论了反应条件(反应摩尔比、反应时间、反应温度、水含量)对产率及产物性能的影响;用红外光谱和核磁共振对结构进行表征分析时,发现季铵盐阳离子基以N位上取代为主;通过电镜图片对壳聚糖和季铵盐衍生物外观形貌进行对比,采用酸碱电导滴定法测定产物的取代度,并对常用取代度公式做了修正。

Analytical results show that: Anode evaporation rate, which determines mostly the production rate of UFMP, is influenced by the many factors including electric parameters of arc, ambient conditions and material properties et al; Existence and increase of anode ejection can influence the production rate and property of UFMP; It is firstly found and investigated that surface connexity phenomenon of Al anode material. Analyses and calculation show that formation of anode spot and existence of self-magnetic field force play an important part in surface connexity process; Effects of cathode material on prepared UFMP is also experimentally studied and theoretically analysed. It shows that effect of the cathode is inconsiderable under the experimental conditions used in the study. At last, the experimental results found in part one are analysed and discussed in detail.

然后详细分析了电弧与电极间的相互作用过程,结果表明:决定超微粉产率的阳极材料蒸发率受许多因素影响,它主要与电弧电参量,环境条件及材料性质有关;阳极表面液滴喷溅的存在和加剧将严重地影响所制超微粉的产率和性质;首次发现和实验研究了Al阳极表面凸起现象,并对此现象进行了详细的理论分析和实际估算,认为阳极斑点的形成及自磁场作用力的存在在该过程中起着重用作用;实验研究和理论分析了阴极材料对所制超微粉的影响,认为在本文所用实验方法及条件下,阴极材料对粉的影响很小。

In case a shareholder of the enterprise fails to pay the contributable capital (including provision of cooperation conditions) and quits the enterprise willingly, and another shareholder or a new shareholder intends to take over the contribution (including provision of cooperation conditions) of the withdrawing shareholder, the voluntary shareholding withdrawal announcement of the quitting shareholder shall be submitted (1 original, signed by the legal representative of the shareholders, sealed by the shareholders).

企业股东因未缴付出资自愿退出企业,而其他股东或新股东愿意承接退股股东的出资的,提交退股股东自愿退股声明(原件1份,各股东法定代表人签字,股东盖章)。

Works are copyrightable works that the country approves of in the form of law in the country (Including positive conditions and negative conditions). This concept includes the essence of the works and the important document of the composition.

作品是国家以法律形式认可的(包括正面条件和反面条件)可版权作品,这个概念本身包含了作品的本质和构成要件。

The real-world joints in the aircraft structure usually consist of multi-row fasteners. This thesis builds the 3D FE contact analysis model of a typical aircraft joint with three-row countersunk screws, and studies pin-load distribution and stress characteristics under constant and varied cross-section thicknesses as well as with and without pre-tighten screw conditions for the joint. Many applied pin-load numerical distribution laws for different conditions in the joint are recognized.

本文对典型的多排沉头螺钉接头建立了三维有限元接触分析模型,对螺钉的钉载分布在截面等厚度和变厚度、无预紧力和加预紧力多种情况下进行了数值计算分析,给出了诸多实用化钉载分布规律。

In the course of anode oxidation, amorphous carbon atoms were etched under the suitable conditions at first, then, crystallitic carbon atoms would be etched as the surface treatment conditions becoming more rigorous.

结果表明,如果采取适当的阳极氧化条件,可以同时增加ACF的表面含氧官能团数目和比表面积,从而使ACF吸附性能有较大的提高。

The related reaction conditions and factors such as catalysis of some catalysts etc were discussed. In the procedures, 2-pentylidene cyclopentanone intermediate, which could be isomerizated into a 2-pentyl cyclopentenone under acidic conditions, was effectively prepared in the presence of a phase transfer promotor.

讨论了正戊醛和环戊酮在碱性条件下缩合生成2-亚戊基环戊酮的反应温度、碱浓度、相转移催化剂等因素对反应的影响。2-亚戊基环戊酮中间体化合物能在酸催化剂作用下,异构成2-戊基环戊烯酮,其中酸浓度和溶剂等参数对反应影响明显。

Changes in Xc for different pulp cellulose fibers are not the same during the ultrasonic treatment. Crystallization and decrystallization may both exist during the treatment at the conditions of lower-intensity ultrasonic wave. After treatment with ultrasonic Xc of MBKP cellulose is decreased and that of EBKP is increased. The changes of Xc of different pulp cellulose are more closely correlated to the fibers' morphology size and the cavitation state. The maximum Xc of 84% is obtained when BEKP cellulose is treated under the conditions of ultrasonic frequency f=23-25kHz, power=400w, and treatment time t=720s.

不同原料来源的纤维素纤维,由于形态尺寸和超分子结构的差异,经超声波处理后超分子结构表现出不同的变化规律;超声波处理过程中,结晶和消晶两种作用同时存在;超声波功率对纤维素的结晶度有较大的影响,对晶体尺寸有一定程度的影响,但结晶度Xc与超声功率没有线性关系;在频率为23-25kHz,功率为400W条件下,对桉木漂白浆纤维进行超声波处理,可获得高结晶度(84%)的纤维素样品。

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"Yes, now you can give yourself airs," she said, you have got what you wanted.

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Then the LORD said to me: Rebel Israel is inwardly more just than traitorous Judah.

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我尽了全力引导会众明白吗?