查询词典 concentration on

This paper presents a study of the effect of initial algal density and phosphorus concentration on the competition between Platymonas subcordiformis and Ulva pertusa. The growth of P.

摘 要：本文以磷浓度和种群密度为变量，以亚心形扁藻为浮游微藻代表，采用实验生态学手段研究了大型海藻孔石莼与浮游微藻间的竞争。

Valonia extract was oxidized by H2O2. The modified valonia tannin was investigated for adsorption removal of copper in aqueous solution. The influences of pH value, initial Cu(superscript 2+) concentration on adsorption capacity of Cu were discussed.

以橡椀栲胶为原料，通过双氧水氧化降解改性，研究水解类橡椀单宁改性后对铜离子溶液的吸附沉淀以及pH值、金属溶液初始浓度对铜离子吸附沉淀容量的影响和规律。

Valonia extract was oxidized by H2O2. The modified valonia tannin was investigated for adsorption removal of copper in aqueous solution. The influences of pH value,initial Cu2+ concentration on adsorption capacity of Cu were discussed.

以橡椀栲胶为原料，通过双氧水氧化降解改性，研究水解类橡椀单宁改性后对铜离子溶液的吸附沉淀以及pH值、金属溶液初始浓度对铜离子吸附沉淀容量的影响和规律。

METHODS By the means of viscometry , the effects of reaction time , chitosan and acetic acid concentration on the hydrolytic velocity of chitosan by ultrasonic wave were investigated .

采用粘度测定法，探讨了超声波辐射时间与壳聚糖粘度的关系以及壳聚糖的浓度，醋酸的浓度对降解速度的影响。

Rotary viscosimeter is employed to reflect the effect of the composition, shear, temperature and salt concentration on viscosity of the modified polyacrylamide was studied in different synthesis approaches.

为了增强聚丙烯酰胺的增粘性能，提高其抗剪切、抗温和抗盐性，使用实验室自制的疏水单体、丙烯酰胺和离子型单体，通过3种不同的聚合方法进行自由基共聚合。

Nanostructured zirconia doped with yttria was prepared by co-precipitate method. The structures were characterized by X-ray diffraction and Extend X-ray absorption fine structure . The influences of calcined temperature and Y〓O〓 concentration on structure in crystallization process were studied systematically.

1利用XRD和EXAFS方法对共沉淀方法制备的非晶和纳米ZrO〓：Y〓O〓的结构进行了表征，比较系统地研究了不同处理温度和不同Y〓O〓掺杂浓度在其晶化过程中对结构的影响，并讨论了氧空位所处的位置。

Screening of acaricidal active plants: Acaricidal activity of industrial alcohol extract from 200 plants in 50% concentration on adult mites of P.communis cuniculi was investigated in vitro.

具有杀螨活性植物的筛选：采用点滴法离体杀螨试验观察了200 味中药工业酒精提取物对家兔痒螨(P.communis cuniculi)成虫的杀灭活性。

This article analyses some basic conceptions that are comparatively vayue or even wrong wrong in the teaching of middle school chemistry, like the definition of chemical change, the influence of concentration on a chemical reaction , the structure of oxacid,and the acidity of sulfuric acid, the acidity of carbonic acid, and the conversion of allotropic substance.

分析了中学化学教学中的几个比较模糊甚至错误的基本概念，如化学变化、浓度对化学反应速度的影响、含氧酸的结构、硫酸的酸性、碳酸的酸性、热化学方程式的表示法、同素异形体间的转化等，并从大学化学角度加以澄清，以便使大一学生更准确地理解和掌握这些基本概念。

The effects of different pH value and heavy metal concentration on rooting of Alternanthera philoxeroides were studied.

研究不同pH值和不同重金属浓度对水花生生根情况的影响。

The influences of the sulfide source and Na_2S_2O_3 solution concentration on the preparation of nanometer mercuric sulfide/amidoxime composite fiber were investigated,and the antibacterial properties of different fibers to staphylococcus aureus and bacillus subtilis were studied.

探讨了硫源和硫代硫酸钠溶液浓度对制备纳米硫化汞/偕胺肟复合纤维的影响，并研究了纤维对金黄色葡萄球菌和枯草芽孢杆菌的抗菌性能。运用红外光谱仪及扫描电镜对样品进行了表征。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。