酸值

Results Positive rate of Amsel was 28%, one step sialidase was 34%, Gram-stain was 30% and amines was 24%. Using Amsel as criterion, the sensitivity of one step sialidase and amines was 92.9% and 71.4%; specificity was 88.9% and 94.4%; positive predictive value was 76.5% and 83.3% negative predictive value was 97% and 89.5%, using Gram-stain method as criterion, the sensitivity of one step sialidase and amines was 93.8% and 66.7%, specificity was 92.1% and 94.3%, positive predictive value was 83.3% and 83.3%, negative predictive value was 97.2% and 86.8% respectively.

Amsel法阳性率28%，组织多胺试验阳性率24%，一步法唾液酸酶活性的检测试验阳性率34%，革兰染色细菌评分法阳性率30%；唾液酸酶活性检测法与Amsel法，革兰染色细菌评分法相比较差异无显著性；组织多胺试验与Amsel法，革兰染色细菌评分法相比较差异无显著性；以Amsel法为标准，一步法唾液酸酶活性检测法和组织多胺试验的灵敏度分别为92.9%和71.4%，特异性分别为88.9%和94.4%，阳性预期值分别为76.5%和83.3%，阴性预期值分别为97.0%和89.5%；以革兰染色细菌评分法为标准，一步法唾液酸酶活性检测法和组织多胺试验的灵敏度分别为93.8%和66.7%，特异性分别为92.1%和94.3%，阳性预期值都为83.3%，阴性预期值分别为97.2%和86.8%。

The effects of solution\'s pH value, mol ratio between phenyl aldehyde and L-Arginine, concentrations of sodium chloride, ammonia chloride andL-Lystine, initial concentration of L-Arginine on precipitation rate of a -tolylene arginine were investigated, the results indicated that phenyl aldehyde precipitation method\'s appropriate pH value was higher than 11, suitable mol ratio between phenyl aldehyde and L-Arginine was 1.25, initial concentration of L-Arginine was must higher than 15g/L, sodium chloride had little effect on precipitation rate, on the contrary, ammonia chloride and L-Lystine had great effect on it, both of them must be eliminated; At the same time, adsorption isotherm at 25 C of L-Lystine on anion exchange resin A was measured, the result showed that the maximal equilibrium adsorbance was 30mg/g, the influences of solution\'s pH value, temperature, concentration of chloride ion on adsorption of L-Lystine by anion exchange resin A were also studied, the results indicated that appropriate operational pH value was 0.5 0.2, the effect of temperature on adsorption ratio was little, process could be operated at room temperature, the concentration of chloride ion must be eliminated.

考察了溶液pH值、苯甲醛与L-精氨酸摩尔比、氯化钠与氯化铵浓度、L-赖氨酸浓度、L-精氨酸初始浓度对苯甲醛沉淀L-精氨酸的影响，结果表明，沉淀反应的适宜pH值大于11，苯甲醛与L-精氨酸的适宜摩尔比为1.25，(来源：Aa6BC论文网www.abclunwen.com)L-精氨酸适宜的初始浓度在15g/L以上，氯化钠的存在对沉淀率基本上没有影响，而氯化铵和L-赖氨酸的存在使沉淀率下降；同时测定了25℃时阴离子交换树脂A吸附L-赖氨酸的吸附等温线，表明其最大平衡吸附量为30mg/g，考察了溶液pH值、温度、氯离子浓度对阴离子交换树脂A吸附脱除L-赖氨酸的影响，结果显示从L-精氨酸和L-赖氨酸混合液中吸附分离出L-赖氨酸的适宜pH值为10.5±0.2，温度对L-赖氨酸吸附率影响不大，吸附过程可在室温下进行，氯离子的存在使L-赖氨酸的吸附率降低。

Their catalytic activities changed with acid value and reaction temperature. The detail components of the bio-diesel production were analyzed by GC-MS. The results showed that the ZrO2-SO4(superscript 2-) lost its catalytic activity in high acid value Jatropha curcas oil.

以麻疯树油为原料油，分别比较了原料油的酸值及反应温度对2种催化剂的影响，利用气相色谱－质谱联用分析仪分析了产物的组成。

The relational order of indexes to mileages is acid value, ignition point, viscosity, number of big abrasion particles and severity of wear index.

对于汽车行驶里程，发动机油液监测指标间的关联序依次是酸值、燃点、闪点、粘度、大磨粒数和磨损烈度指数。

Taking SINOPEC Tianjin Company as an example, the corrosion characteristics and mechanism in oil-refining units have been analyzed and studied, especially, the corrosion in atmosphere-vacuum unit.

由于炼油厂装置的腐蚀主要是由原油中的硫化物和酸性介质所产生。近年来，国内炼油行业原油的酸值及含硫量也逐年增加，给炼厂装置的安全运行造成了严重危害。

Technology of sulfuric acid catalyzed ethyl esterification of high acid value tuna oil was studied.

以浓硫酸为催化剂，对高酸值金枪鱼油进行了乙醇酯化工艺的研究。

Results indicated that the acid value of domestic finish is 0.54, the value of saponification is 18.08. The viscosity changes slightly with the concentration and temperature of finish. The beginning decomposition temperature is 378.6°C.

结果表明：国产油剂的酸值是0.54，皂化位是18.08；粘度随油剂浓度和温度的变化平缓；起始分解温度为378。

The adding mode of titrant and the determination of endpoint were studied by T50 potentiometric titrator. The effect of nonaqueous electrode and carbon dioxide on the experimental results was analyzed, and the optimal testing conditions were determined.

采用T50电位滴定仪对滴定剂的添加方式和终点的确定方式进行了研究，分析了非水测量电极和二氧化碳对测定结果的影响，确定了喷气燃料总酸值的最佳测定条件。

The relationship between the isothermal line in liquid phase and that in vapor phase at different TAN values had a significant distinction with the change of temperature.

腐蚀速度随着温度的上升而增加，同一温度下酸值影响气相腐蚀速度与液相腐蚀速度之间的关系。

Roles of hydrogen donor in visbreaking of vacuum residue;2. The feedstock of visbreaking unit of Sudan Block 6 Oil Field is Fula viscous crude with low sulfur,high density,high viscosity, high TAN,and high metal content.

苏丹六区油田减黏裂化装置以苏丹六区稠油为原料油，其性质为低硫、高密度、高黏度、高酸值、高金属含量的重质原油，经过减黏裂化，原油黏度可达到管道外输标准。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。