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采用隔离层阻碱法进行盐碱地造林 被引量:8
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作者 李万海 田永峰 +3 位作者 张延新 高亚芹 马晓道 郭喜军 《林业科技》 北大核心 2001年第4期12-13,共2页
大庆市是黑龙江省土地盐碱化最严重的地区 ,植树造林难度大。造林时在植树穴底铺垫一定厚度的粉煤灰和磷肥 ,能有效地阻止盐碱上升 ,大大提高造林成活率。
关键词 造林 粉煤灰 隔离层 阻碱
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抗碱底漆及其阻碱效应 被引量:2
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作者 王全顺 《上海涂料》 CAS 2009年第9期34-36,共3页
分析了影响建筑物外墙涂膜耐久性的各种因素。介绍了抗碱底漆阻碱、盐的机理,并对比了阴离子型丙烯酸底漆、阳离子型硅丙底漆、水性环氧底漆、硅溶胶-乳液复配底漆、渗透型有机硅底漆、溶剂型底漆的性能。
关键词 底漆 阻碱效应 外墙涂料
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抗泛碱装饰砂浆的研究 被引量:10
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作者 滕朝晖 王勤旺 《中国胶粘剂》 CAS 北大核心 2011年第1期40-43,共4页
为了解决装饰砂浆普遍存在的泛碱难题,以可再分散乳胶粉(SWF-08)、羟丙基甲基纤维素醚(HPMC)、阻碱剂和憎水剂(SWR-100)为影响因素,以14 d拉伸强度和泛碱性为考核指标,采用单因素分析法优选出制备装饰砂浆的最佳配方。结果表明:各种物... 为了解决装饰砂浆普遍存在的泛碱难题,以可再分散乳胶粉(SWF-08)、羟丙基甲基纤维素醚(HPMC)、阻碱剂和憎水剂(SWR-100)为影响因素,以14 d拉伸强度和泛碱性为考核指标,采用单因素分析法优选出制备装饰砂浆的最佳配方。结果表明:各种物料对装饰砂浆抑制泛碱作用的大小依次为阻碱剂>HPMC>胶粉>憎水剂;当w(阻碱剂)=1.8%、w(HPMC)=0.4%、w(胶粉)=3.0%和w(憎水剂)=0.2%时,装饰砂浆的抑制泛碱作用最强,并且其拉伸强度较高。 展开更多
关键词 装饰砂浆 可再分散乳胶粉 羟丙基甲基纤维素醚 抗泛 阻碱
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直接内重整熔融碳酸盐燃料电池研究进展 被引量:2
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作者 王鹏杰 周利 +2 位作者 王英旭 李广龙 邵志刚 《电源技术》 CAS CSCD 北大核心 2011年第1期105-108,共4页
简单介绍了直接内重整-熔融碳酸盐燃料电池(DIR-MCFC)的优点、系统及瓶颈问题,并指出在电池长时间运行时重整催化剂的碱污染和积碳失活是DIR-MCFC的核心技术问题;重点叙述了DIR-MCFC在抗碱中毒、抗积碳催化剂方面的研究进展,并进一步提... 简单介绍了直接内重整-熔融碳酸盐燃料电池(DIR-MCFC)的优点、系统及瓶颈问题,并指出在电池长时间运行时重整催化剂的碱污染和积碳失活是DIR-MCFC的核心技术问题;重点叙述了DIR-MCFC在抗碱中毒、抗积碳催化剂方面的研究进展,并进一步提出了发展方向。 展开更多
关键词 熔融碳酸盐燃料电池 直接内重整 抗积碳 中毒 阻碱
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Initial corrosion behavior of pure zinc in simulated tropical marine atmosphereInitial corrosion behavior of pure zinc in simulated tropical marine atmosphere 被引量:10
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作者 Qi YIN Zhen-yao WANG Chen PAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第12期2582-2591,共10页
The initial corrosion behavior of pure zinc in a simulated tropical marine atmosphere was investigated using gravimetric method,scanning electron microscope combined with energy dispersive spectroscopy(SEM-EDS),X-ray ... The initial corrosion behavior of pure zinc in a simulated tropical marine atmosphere was investigated using gravimetric method,scanning electron microscope combined with energy dispersive spectroscopy(SEM-EDS),X-ray diffractometry(XRD),Fourier transform infrared spectrometry(FTIR)and electrochemical impedance spectroscopy(EIS).The kinetics of corrosion process is a decelerating process following the empirical equation D=At^n(n<1).The protectiveness of the corrosion product layer could be attributed to the formation of simonkolleite,Zn5(OH)8Cl2·H2O,which could inhibit the rate determining step,namely charge transfer step,of the electrochemical corrosion process.A model of the evolution process of the product layers formed on zinc was proposed.In addition,the regularity of the corrosion rate of zinc as a function of the NaCl deposition rate can be described by a power function. 展开更多
关键词 ZINC corrosion kinetics corrosion product electrochemical impedance spectroscopy (EIS) simonkolleite
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Rheological and drag reduction properties of hydroxypropyl xanthan gum solutions 被引量:8
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作者 田萌 方波 +4 位作者 金雷平 卢拥军 邱晓慧 金浩 李科晶 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第9期1440-1446,共7页
Hydroxypropyl xanthan gum(HXG) was prepared from xanthan gum(XG) and propylene oxide under alkaline condition. Rheological and drag reduction properties of different concentrations of aqueous HXG and XG solution were ... Hydroxypropyl xanthan gum(HXG) was prepared from xanthan gum(XG) and propylene oxide under alkaline condition. Rheological and drag reduction properties of different concentrations of aqueous HXG and XG solution were studied. The micro-structure network of HXG and XG solutions was investigated by Cryo-FESEM. The results showed that HXG and XG solutions could exhibit shear thinning property. The apparent viscosity of6 g·L-1HXG solution was 1.25 times more than that of 6 g·L-1XG solution. The storage modulus G′ and the loss modulus G″ of HXG solutions were greater than those of XG solutions, and thixotropic and viscoelastic properties were more significant in HXG solutions. The HXG and XG solutions reduced the pressure drop of straight pipe, and the maximum drag reduction of 1 g·L-1HXG and XG in smooth tube reached 72.8% and 68.1%, respectively. Drag reduction rate was increased as the concentration increased. The HXG solution may become a new polymeric drag reducer. 展开更多
关键词 Hydroxypropyl xanthan gum Rheological properties Drag reduction Cryo-FESEM
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The Performance of ZX Type Scale Inhibitors in Evaporation Process of Salt Electrolyte
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作者 陈振兴 黄彩娟 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2001年第3期280-283,共4页
Rapid fouling tests were used to investigate the scale-preventing property of ZX type scale inhibitors in evaporation of salt electrolyte. ZX type scale inhibitors were tested at high temperature under the boiling con... Rapid fouling tests were used to investigate the scale-preventing property of ZX type scale inhibitors in evaporation of salt electrolyte. ZX type scale inhibitors were tested at high temperature under the boiling conditions. The results indicate that ZX type scale inhibitors have remarkable scale preventing performance during evaporation of salt electrolyte even at the temperature up to 150℃. Among them, ZX Ⅲ type scale inhibitor is the best with the rate of scale-preventing reaching to 88.9%. In addition, the scale preventing mechanism of ZX type scale inhibitors was analyzed and its application prospect in the field of continuous commercial fouling preventing discussed. 展开更多
关键词 on-line scale preventing scale inhibitor salt electrolyte EVAPORATION FOULING
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Role of surface frustrated Lewis pairs on reduced CeO2(110)in direct conversion of syngas
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作者 Zheng-Qing Huang Teng-Hao Li +1 位作者 Bolun Yang Chun-Ran Chang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第12期1906-1915,共10页
Direct syngas conversion to light olefins on bifunctional oxide-zeolite(OX-ZEO)catalysts is of great interest to both academia and industry,but the role of oxygen vacancy(Vo)in metal oxides and whether the key interme... Direct syngas conversion to light olefins on bifunctional oxide-zeolite(OX-ZEO)catalysts is of great interest to both academia and industry,but the role of oxygen vacancy(Vo)in metal oxides and whether the key intermediate in the reaction mechanism is ketene or methanol are still not well-understood.To address these two issues,we carry out a theoretical study of the syngas conversion on the typical reducible metal oxide,CeO2,using density functional theory calculations.Our results demonstrate that by forming frustrated Lewis pairs(FLPs),the VOs in CeO2 play a key role in the activation of H2 and CO.The activation of H2 on FLPs undergoes a heterolytic dissociative pathway with a tiny barrier of 0.01 eV,while CO is activated on FLPs by combining with the basic site(O atom)of FLPs to form CO2^2-.Four pathways for the conversion of syngas were explored on FLPs,two of which are prone to form ketene and the other two are inclined to produce methanol suggesting a compromise to resolve the debate about the key intermediates(ketene or methanol)in the experiments.Rate constant calculations showed that the route initiating with the coupling of two CO*into OCCO*and ending with the formation of ketene is the dominant pathway,with the neighboring FLPs playing an important role in this pathway.Overall,our study reveals the function of the surface FLPs in the activation of H2 and CO and the reaction mechanism for the production of ketene and methanol for the first time,providing novel insights into syngas conversion over OX-ZEO catalysts. 展开更多
关键词 Syngas conversion Light olefins Oxide-zeolite Frustrated Lewis pairs CEO2
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Alkaline treatment kinetics of calcium phosphate by piezoelectric quartz crystal impedance 被引量:1
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作者 曾丽萍 何德良 +1 位作者 许超 罗胜联 《Journal of Central South University》 SCIE EI CAS 2009年第4期558-562,共5页
Calcium phosphate film was prepared by electrochemical deposition technology. Subsequently, the alkaline treatment process of calcium phosphate film in 0.1 mol/L NaOH solution was monitored on real time by the piezoel... Calcium phosphate film was prepared by electrochemical deposition technology. Subsequently, the alkaline treatment process of calcium phosphate film in 0.1 mol/L NaOH solution was monitored on real time by the piezoelectric quartz crystal impedance (PQCI) technique. The variations of morphology and composition for the alkaline treatment products were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) and X-ray diffraction (XRD), respectively. The dynamic variations of calcium phosphate can be characterized by the change of equivalent circuit parameters. The results show that the forming process of hydroxyapatite (HA) is composed of three stages: (1) acidic calcium phosphate dissolution; (2) phase transformation; and (3) HA formation. Furthermore, the correlative kinetic equations and parameters are obtained by fitting the static capacitance (C8)-time curves. 展开更多
关键词 HYDROXYAPATITE calcium phosphate piezoelectric quartz crystal impedance alkaline treatment KINETICS
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RAT EXOCRINE PANCREATIC SECRETION BYVAGAL STIMULATION OCCURSVIAMULTIPLEMEDIATORS
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作者 何晓东 《Chinese Medical Sciences Journal》 CAS CSCD 1996年第2期73-77,共5页
The vagus is a mixed nerve containing cholinerrgic and non-cholinergic neurons. Vagal fibers interact with peptidergic neurons of the enteric nervous system which stain immunohistochemically for cholecystokinin, vasoa... The vagus is a mixed nerve containing cholinerrgic and non-cholinergic neurons. Vagal fibers interact with peptidergic neurons of the enteric nervous system which stain immunohistochemically for cholecystokinin, vasoactive intestinal polypeptide, and gastrin releasing peptide. The contribution of these peptidergicneurons in the pancreatic response to vagal stimulation is unknown. We tested the effect of specific inhibitor of these stimulants against vagally mediated exocrine secretion in rats. The response to vagal stimulation was blocked significantly by each of the following:the ganglionic blocker hexamethonium (l00% inhibition); the muscarinic, cholinergic blocker atropine (85% inhibition); the specific cholecystokinin-A receptor blocker (91 % inhibition); and a vasoactive intestinal polypeptide polyclonal antibody (89% inhibition). This observation is consistent with the hypothesis that potentiating interactions among several agonists mediate the vagal response. Our study, however, dose not exclude acetylcholine as the final commommediator. 展开更多
关键词 CHOLECYSTOKININ gastrin-releasing peptide: dimethyl sulfoxide
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