搜索结果: 76-90 共查到“理学 pH”相关记录291条 . 查询时间(0.392 秒)
This paper studies many-server limits for multi-server queues that have a phase-type service time distribution and allow for customer abandonment. The first set of limit theorems is for critically lo...
A novel optical membrane with extended detection range of pH
pH sensor Bromocresol Green Malachite Green Oxalate
2010/12/3
A pH optical sensor was developed based on the use of a mixture of Malachite Green Oxalate and Bromocresol Green indicators immobilized in a triacetylcellulose membrane, which had been previously hydr...
A novel optical membrane with extended detection range of pH
Mixed reagents pH sensor Bromocresol Green Malachite Green Oxalate
2010/10/19
A pH optical sensor was developed based on the use of a mixture of Malachite Green Oxalate and
Bromocresol Green indicators immobilized in a triacetylcellulose membrane, which had been previously hyd...
The sorption of Eu(III) on calcareous soil: effects of pH, ionic strength, temperature, foreign ions and humic acid
Sorption Europium HA Temperature Ionic strength Foreign ions
2011/11/10
The sorption of Eu(III) on calcareous soil as a function of pH, humic acid (HA), temperature and foreign ions was investigated under ambient conditions. Eu(III) sorption on soil was strongly pH depend...
pH-Responsive Carboxymethylcellulose-g-Poly(sodium acrylate)/Polyvinylpyrrolidone Semi-IPN Hydrogels with Enhanced Responsive and Swelling Properties
carboxymethyl cellulose polyvinylpyrrolidone semi-interpenetrated polymer network superabsorbent hydrogel pH-responsive
2011/12/13
Novel pH-responsive semi-interpenetrated polymer network (semi-IPN) superabsorbent hydrogels were prepared by the radical graft polymerization of carboxymethylcellulose (CMC) and partially neutralized...
生物膜作用下沉积物-水界面溶液中pH和磷含量变化
生物膜 界面 磷 pH
2014/6/6
采集城市排污水渠中的沉积物样品和底栖生物样品,应用微电极原位pH测量技术测量沉积物-水界面溶液的pH值,电感耦合等离子体发射光谱法测定沉积物提取液中上覆水和空隙水中生物可利用磷的含量,研究了沉积物表面的生物膜对城市河流沉积物-水界面微环境中pH值和磷含量的影响。研究表明沉积物表面的生物膜由藻类(蓝藻门颤藻属Oscillatoria和硅藻门的菱形藻Nitzschia)和微生物组成,由于藻类的光合作用...
研究了固定配比的钠化膨润土与土壤在不同pH条件下对重金属离子的吸附效果。钠化膨润土与污染土壤按质量比1∶10和1∶20的比例混合,用碳酸氢铵-二乙三胺五乙酸(AB-DTPA)法提取土壤中有效态重金属。结果表明,在钠化膨润土与土壤质量比为1∶20的条件下,取得了最佳的修复效果;在pH=9.14时该混合土壤对重金属的总体吸附效果最佳。在实际土壤修复中,针对不同重金属污染,应灵活调整修复材料...
导数紫外光谱法研究pH诱导牛血清蛋白 构象变化
牛血清蛋白 构象变化 导数紫外光谱
2011/12/23
采用二阶导数紫外光谱,研究了牛血清蛋白(BSA)中色氨酸(Trp)、酪氨酸(Tyr)和苯丙氨酸(Phe)3种芳香族氨基酸残基的精细吸收谱带,并结合其肽键的吸收谱带综合分析了BSA pH值在2.3~12区间的构象变化.研究结果表明,BSA在等电点(pH值 4.7)附近时构象变化较大;而在pH 值5.7~10区间,构象变化较小;在强酸(pH值2.3)和强碱(pH值12)环境中,BSA构象变化非常明显....
pH型有机磷水解酶生物传感器的稳态模型
有机磷水解酶 生物传感器模型 稳态检测
2014/5/12
从分析pH型有机磷水解酶（OPH）生物传感器（简称OPH-pH型传感器）的工作原理出发，建立了描述稳态检测过程的扩散传质方程组，并根据方程组的特点将二阶微分方程组简化为二阶微分方程和非线性方程的求解，从而建立了OPH-pH型传感器的稳态模型。模型的计算结果给出了传感器性能的影响因素，可对传感器的设计提供一定的理论指导，自行制备的传感器实验结果与模型的计算结果基本吻合，验证了模型的正确性。
Nanocomposite of carboxymethyl cellulose and attapulgite as a novel pH-sensitive superabsorbent: Synthesis, characterization and properties
Superabsorbent nanocomposite Carboxymethyl cellulose Attapulgite pH-sensitive Swelling
2011/12/14
Grafting vinyl monomers onto natural polysaccharides and then compounding with inorganic nano-scale clays become a preferred method to derive superabsorbents because it afforded unique environmental a...
电解质和pH值对毒死蜱微乳液透明温度范围的影响
毒死蜱 微乳液 透明温度范围
2010/8/30
研究了电解质和pH值对毒死蜱微乳剂透明温度范围的影响，表面活性剂采用特殊苯乙基酚甲醛树脂聚氧乙烯醚和十二烷基苯磺酸钙（DBSCa）(质量比为3∶7)复合物。 研究结果表明，电解质的加入对表面活性剂质量分数分别为20%、18%和16%作用的微乳剂透明温度范围均有显著影响，使上限温度明显下降；随阳离子电解质质量分数增加，上限温度下降；随阴离子电解质价数增加，上限温度先略增加后下降。 电解质及其价数对下...
用EXAFS研究pH对Zn(Ⅱ)-TiO2体系吸附和微观构型的影响
延长X射线吸收精细结构 pH 吸附可逆性 Zn(Ⅱ)
2010/3/11
应用延展X射线吸收精细结构(EXAFS)方法, 研究了不同pH对Zn(Ⅱ)在锐钛矿型TiO2表面吸附产物的微观构型的影响. 宏观的吸附-解吸实验表明, 随着pH值由5.8增大至6.8, 吸附等温线明显升高, Freundlich吸附常数由1.345 L/g增加到15.385 L/g; 而体系的不可逆性逐渐降低, 不可逆吸附系数(TⅡ)由0.43降低到0.23. 不同pH条件下吸附样品的EXAFS结...
Comment on "New constraints of a light CP-odd Higgs boson and related NMSSM Ideal Higgs Scenarios" by Dermisek and Gunion (arXiv:1002.1971 [hep-ph])
light CP-odd Higgs boson NMSSM Ideal Higgs
2010/3/16
In two recent papers (arXiv:1002.1971 [hep-ph] and arXiv:0911.2460 [hep-ph]) Dermisek and Gunion provide new constraints on a light CP-odd Higgs boson in the framework of the NMSSM (or similar models)...
合成了5种不同结构的席夫碱（N-苯基苯甲亚胺、具有—OH基团的N-苯基-2-羟基苯甲亚胺和N-(2-羟基)苯基苯甲亚胺、具有—NO2基团的N-苯基-4-硝基苯甲亚胺和N-(4-硝基)苯基苯甲亚胺）.利用循环伏安法对5种席夫碱水溶液在玻碳电极上的电化学氧化还原行为进行了研究.同时考察了pH对席夫碱—CH＝＝N—基团的电化学氧化还原反应的影响.结果表明：这5种席夫碱的—CH＝＝N基团都可以在玻碳电极上...
Synthesis and swelling properties of pH-sensitive semi-IPN superabsorbent hydrogels based on sodium alginate-g-poly(sodium acrylate) and polyvinylpyrrolidone
Superabsorbent hydrogel Polyvinylpyrrolidone Sodium alginate Semi-interpenetrating polymer network Swelling
2011/12/14
A pH-sensitive semi-interpenetrating polymer network (semi-IPN) superabsorbent hydrogel composed of sodium alginate-g-poly(sodium acrylate) (NaAlg-g-PNaA) network and linear polyvinylpyrrolidone (PVP)...