搜索结果: 91-105 共查到“知识库 理学 pH”相关记录251条 . 查询时间(0.071 秒)
多壁碳纳米管在精氨酸溶液中分散性的pH敏感性
多壁碳纳米管 精氨酸 非共价修饰 pH敏感性
2009/10/15
通过非共价反应将精氨酸包覆于多壁碳纳米管上, 并用荧光分光光度计和原子力显微镜检测其在不同pH值条件下的分散性和凝聚性. 结果表明: 改性后的碳纳米管的分散性具有pH敏感性, pH值越大, 分散性越好, 且灵敏度高. 同时对其pH敏感性的机理进行了分析与讨论. 这将对碳纳米管在药物载送、生物传感等方面的应用有重要的意义.
THE USE OF ARTIFICIAL BIOFILMS TO STRIP NUTRIENTS FROM AN INDUSTRIAL SMELTER’S WASTE WATER UNDER CONDITIONS OF LOW TEMPERATURE AND HIGH PH
Environment Protection Authority LOW TEMPERATURE water quality parameters
2009/10/13
The Victorian Environment Protection Authority (EPA) has identified Alcoa’s Point Henry aluminium smelter as being a major source of recognized pollutant input due to its disposal of effluent into Cor...
基于PH分布和MAP的备件(s, S)库存模型
Phase-type分布 马尔可夫到达过程 备件需求 库存模型
2009/9/25
以包含多个相同部件的系统为研究对象,采用Phase-type(PH)分布代替指数分布等经典分布作为备件寿命、换件维修时间以及库存补充时间的基本假设,推导出该系统的备件需求过程为马尔可夫到达过程(Markovian ArrivalProcess, MAP); 然后在此基础上, 研究了(s, S)库存模型,给出了该库存模型首次订货时间、再订货周期、缺货时间的相关分布和参数,最后通过一个算例说明了模型的...
用静态批式的方法研究了pH值、离子强度、温度和腐殖酸浓度等因素对Th(Ⅳ) 在凹凸棒石上的吸附、解吸的影响。结果表明，pH值对Th(Ⅳ) 在凹凸棒石上的吸附有显著影响，而离子强度对吸附的影响却相对较弱；Th(Ⅳ)在凹凸棒石表面的吸附主要通过内层络合形式进行，而外层络合和离子交换只是微弱的作用；当pH=1.80时，富里酸(FA)和胡敏酸(HA)对吸附亦有促进作用；升高温度有利于Th(Ⅳ) 在凹凸棒...
小黑桫椤(Alsophila metteniana)被列为我国国家二级保护植物。为探讨其种群数量下降原因, 作者采用无菌培养方法和显微观察技术, 在实验条件下研究了光照强度、光质、温度和pH值对小黑桫椤孢子萌发及早期配子体发育的影响。结果表明: 孢子萌发和配子体发育的最适光照强度为40–70 µmol;m–2;s–1, 全黑暗时孢子不萌发；白光、红光、黄光和蓝光下的萌发率分别为68.7...
膨胀剂用量、合成体系pH值和MCM-22(P)的硅/铝比对ITQ-2分子筛合成的影响
MCM-22分子筛 十六烷基三甲基溴化铵 四丙基氢氧化铵 插层膨胀 超声剥离 ITQ-2分子筛
2009/9/14
考察了膨胀剂的用量、合成体系的pH值和MCM-22(P)的硅/铝比对合成ITQ-2分子筛的影响. 结果表明,同时降低膨胀剂十六烷基三甲基溴化铵和四丙基氢氧化铵的用量,在pH=11.5时4 h即可完成对MCM-22(P)的插层膨胀; pH值降低时,可减小由于脱硅对ITQ-2分子筛硅/铝比下降的影响,并且使产物收率大幅度提高. 同时, pH值降低使后续的超声剥离更加容易,且可避免生成MCM-41...
通过高效液相色谱(HPLC)和薄层色谱法(TLC)对灯盏花乙素离解常数进行测定方法研究.在薄层色谱方法中,利用待测组分比移值(Rf值)与固定相pH值的Rf-pH曲线方程;在高效液相色谱方法中,利用待测组分保留因子(κ值)与流动相pH值的κ-pH曲线方程,测定了灯盏花乙素的离解常数,并比较了HPLC和TLC法对灯盏花乙素离解常数的测定.HPLC与TLC法对灯盏花乙素离解常数的测定中κ-pH曲线和Rf...
中华绒螯蟹在不同pH下氨氮排泄和血淋巴含氮成分的变化
中华绒螯蟹 pH 氨氮 血淋巴
2009/8/26
为研究不同环境pH对中华绒螯蟹（Eriocheir sinensis）氮排泄的影响，将性成熟的中华绒螯蟹置于pH 4.5、6.0、7.5、9.0和10.5的环境中，24h后测定血淋巴中不同含氮成分的变化。结果表明，环境pH从4.5到9.0，中华绒螯蟹的氨氮排泄无显著变化，当pH升高到10.5时，氨氮排泄受到显著抑制；同时环境pH的升高还导致血淋巴pH上升，在pH 10.5时，血淋巴氨氮、尿素氮和尿...
Calcification of the cold-water coral Lophelia pertusa,under ambient and reduced pH
Calcification cold-water coral Lophelia pertusa ambient and reduced pH
2010/1/20
The cold-water coral Lophelia pertusa is one of the few species able to build reef-like structures and a 3-dimensional coral framework in the deep oceans. Furthermore, deep cold-water coral bioherms m...
pH modelling in aquatic systems with time-variable acid-base dissociation constants applied to the turbid,tidal Scheldt estuary
pH modelling aquatic systems time-variable acid-base dissociation Scheldt estuary
2010/1/20
A new pH modelling approach is presented that explicitly quantifies the influence of biogeochemical processes on proton cycling and pH in an aquatic ecosystem, and which accounts for time variable aci...
用静态批式的方法研究了[N值’离子强度’温度和腐殖酸浓度等因素对H7"0#在凹凸棒石上的吸附’解吸的影响(结果表明%[N值对H7"0#在凹凸棒石上的吸附有显著影响%而离子强度对吸附的影响却相对较弱!H7"0#在凹凸棒石表面的吸附主要通过内层络合形式进行%而外层络合和离子交换只是微弱的作用!当[Nb"&+)时%富里酸"‘<#和胡敏酸"N<#对吸附亦有促进作用!升高温度有利于H7"0#在凹凸棒石上的吸...
Effects of the pH/pCO2 control method on medium chemistry and phytoplankton growth
Effects pH/pCO2 control method medium chemistry phytoplankton growth
2010/1/20
The control of key chemical parameters in phytoplankton cultures, such as pCO2, pH and Ω (the saturation state of calcium carbonate), is made difficult by the interdependence of these parameters and b...
Preparation and characterization of a novel pH-sensitive chitosan-g-poly (acrylic acid)/attapulgite/sodium alginate composite hydrogel bead for controlled release of diclofenac sodium
Composite hydrogel bead pH-sensitive Controlled release Diclofenac sodium
2011/10/10
A series of pH-sensitive composite hydrogel beads composed of chitosan-g-poly (acrylic acid)/attapulgite/sodium alginate (CTS-g-PAA/APT/SA) was prepared as drug delivery matrices crosslinked by Ca2+ow...
Preparation and characterization of a novel pH-sensitive chitosan-g-poly (acrylic acid)/attapulgite/sodium alginate composite hydrogel bead for controlled release of diclofenac sodium
Composite hydrogel bead pH-sensitive Controlled release Diclofenac sodium
2011/12/14
A series of pH-sensitive composite hydrogel beads composed of chitosan-g-poly (acrylic acid)/attapulgite/sodium alginate (CTS-g-PAA/APT/SA) was prepared as drug delivery matrices crosslinked by Ca2+ o...
Spatial and temporal variation in pH, alkalinity and conductivity in surface runoff and groundwater for the Upper River Severn catchment
pH surface runoff alkalinity conductivity Upper River Severn catchment
2009/6/8
Measurements of pH, alkalinity and electrical conductivity are used to examine the extent of the spatial and temporal variation in stream and ground water chemistry for the Upper Severn catchment, Pl...