查询词典 acetic aldehyde

A quantitative method of alkaloidal monomers is established by HPLC/MS.The The sepatation was performed on a XTerraTM ODS column(5μm,4.6mm id×150mm) with acetonitrile -water-acetic ammonium as mobile phase at the flow –rate of 1mL/min.

建立了苦豆子中主要的生物碱单体含量的测定方法：HPLC-MS法，色谱柱选用XTerraTMODS Column(5μm，4.6mmid×150mm)；流动相为乙腈-水-乙酸铵，采用梯度洗脱，流速为1mL/min，柱温30℃；质谱作为检测器，选择离子采集方式。

For decreasing the quantity of the organic solvent and saving the environment, this paper is focused on the preparation of stable TiO2 sol by using titanium alkoxide as precursor and water as solvent while adding acetic acid for the purpose of moderating the rate of hydrolysis.

溶胶-凝胶处理可以在织物的表面形成复杂的氧化物网络结构，这层凝胶固着在织物的表面，改表纤维的表面化学性能，赋予织物一定的功能性。

2 Condensation of ketones with ethyl cyanoacetate catalysed by ammonium acetate-acetic acid results ethyl alkylidene cL-cyanoacetate in 3 l?.-89% yield under ultrasound irradiation at 4l-450C within

在超声波作用下，以芳香醛和丙二酸为原料，以膨胀石墨作催化剂，合成多种肉桂酸，于41～43℃反应3.5-10小时，产率65-97％。

Compound 2 had allochroic processes in polar solvents such as methanol or DMF. Acids or alkali such as acetic acid or NaOC_2H_5 also showed apparent influence on the allochroic process.

并对化合物2的变色过程进行了研究，发现该化合物对极性溶剂如甲醇、N，N-二甲基甲酰胺和酸或碱如乙酸、乙醇钠等具有良好的变色过程。

The substance with a molecular weight of 6.28kDa has very strong cation character determined by the electrophoresis of diaphragm wafer of fiber of acetic acid. The substance with antibacteria action obtained from forest frog is made up of alanine,aminoacetic acid,leucine,Isoleucine,Proline,aminoglutaric acid,threonine,Serine,lysine.

纯化林蛙皮肤中的抗菌活性物质经醋酸纤维薄膜电泳，表明其具有较强的阳离子特征；经氨基酸分析，表明林蛙皮肤抗菌活性物质是由丙氨酸、甘氨酸、亮氨酸、异亮氨酸、脯氨酸、中国林蛙皮肤抗菌肽的分离纯化和鉴定一摘要谷氨酸、苏氨酸、丝氨酸、赖氨酸组成。

Nonaqueous titration;Aminocaproic acid;Hydrochloride;Hyperehloric acid-acetic acid;Potentiometric titration

非水滴定；6-氨基己酸；6-氨基己酸盐酸盐；冰乙酸-高氯酸；电位滴定

D., 5m. The mobile phase consisted of a ternary gradient: methanol, 0.8% acetic acid and 0.01mol/L ammonic acid.

d。，5m上，以甲醇－0.8%乙酸－0.01mol/L乙酸铵溶液组成的三元流动相进行洗脱分离，紫外280nm检测。

The extraction performance of Zn from HCl medium with a new kind of carboxylic extractant, ammonized sec-octylphenoxy acetic (CA12) and ammonization of the extractant have been studied.

研究了一种新型萃取剂仲辛基苯氧乙酸(CA12)的皂化以及从盐酸介质中萃取Zn的性能。

Methods Intestinal flora of human, rat, Beagle dog, and rabbit and CME were anaerobically cultured at 37℃ in vitro. After being extracted by acetic ether, the main metabolites of CME were separated and quantified by HPLC.

采用人、大鼠、Beagle犬及家兔的新鲜粪便37℃厌氧培养，经醋酸乙酯提取后采用RP-HPLC及LC-MS方法对代谢成分进行分离和定性、定量分析。

The results show that the samples exposed to the air previously for 24 h can be passivated automatically in acetic acid solution with Cl- with the corrosion potential remaining 100mV.No such phenomenon was observed for samples which were cathodically polarized with the corrosion potential stabilizing at a value of -242±3mv. The passive film formed by anodically polarizing is more proof than formed in the air.

研究还发现：在空气中放置24小时后的试样在Cl-醋酸溶液中能自钝化，自腐蚀电位为100mv；经阴极极化后的试样在Cl-醋酸溶液中不能自钝化，其自腐蚀电位为-242±3mv；经阳极极化形成的钝化膜比在空气中自然形成的钝化膜更致密。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。