柱化剂研究进展   总被引：6，自引：0，他引：6  

刘灵燕  肖金凯  张澄博  黄世明 《矿物岩石地球化学通报》2002,21(4):247-252

柱化剂是层柱粘土的重要组成部分，也是层柱化研究中的主要内容。层柱多孔材料孔结构和性能的可调控性正来自于该领域最活跃的研究对象--柱化剂。本对柱化剂的研究进展作了较全面的介绍，并将各种柱化剂分为有机、无机和有机/无机三大类七小类。  相似文献   

基于Mobile Agent技术的个人移动导航设计方案     

魏震方 《测绘科学》2008,(Z1)

文章首先介绍了个人移动导航的概念与研究现状及所面临的问题,然后引入移动Agent技术,并对其进行了概念与特征的介绍。提出了基于Mobile Agent技术的个人移动导航设计方案。该方案集成了无线接入网技术,移动Agent技术,Web服务技术等核心技术,采用了构件化任务封装与UDDI注册管理Agent系统的解决思路。方案具有较好的构建性与可扩展性。最后总结了基于移动Agent技术的个人移动导航系统设计方案的一些优点,指出了移动服务向普适计算模式发展的必然趋势。  相似文献   

东营港经济开发区吹填土现场固化试验     

冯玉国  朱家东  宋彬斌 《岩土工程技术》2008,22(2):101-104,F0003

用新型固化剂对东营港经济开发区吹填土进行了现场固化试验。试验结果表明,吹填土掺入2％固化剂和6％水泥,可显著提高其无侧限抗压强度,固化厚度30-35cm时地基承载力达到120kPa且沉降符合规范要求。  相似文献   

西宁市贵德县河滨公园林场第四系含水层弥散试验研究     

罗奇斌  康卫东  郭康 《现代地质》2015,29(2):245-251

地下水污染问题日益严重,研究溶质运移的弥散理论开始应用于实际问题。建立地下水溶质运移模型,对地下水中污染物的运移及发展趋势进行准确预测,是对地下水进行保护、对地下水污染进行控制的基础。而弥散参数的确定则是地下水溶质运移模型建立的关键环节之一,直接影响着模型预测结果的精度和准确性。 对西宁市贵德县地下水污染的水质运移规律进行分析,在贵德县河滨公园林场采用径向收敛流水动力弥散理论方法进行了第四系含水层现场弥散试验,计算了试验场地潜水含水层的弥散度,获得纵向弥散度(a_L)为0.843~0.998 cm,横向弥散度(a_T)经验推断值为0.17~0.20 cm,为进一步建立该地区的地下水溶质运移模型、预测地下水污染的发展趋势和评价该地区地下水环境质量提供了数据参考。  相似文献   

ADSL宽带技术的实现--黑龙江省地震信息网的改造     

周浩  金星  马昆  蒋昭琳 《地震地磁观测与研究》2004,25(6):97-104

提出了如何应用ADSL宽带服务,改造黑龙江省地震信息网的技术解决方案,论述了整个宽带网络架构模式,介绍了Internet常规应用的实现和网络管理的解决方法。  相似文献   

稠油蒸气—泡沫驱不同油藏区域流体的流变特征   总被引：3，自引：2，他引：1  

龙运前  朱维耀  李娟  刘今子  田巍 《东北石油大学学报》2012,(2):81-85,128

针对稠油蒸气-泡沫驱蒸气腔驱油区泡沫油体系、热水冷凝区热水油体系,通过模拟实际油藏温度压力条件,利用高温高压流变仪,在0～600s-1剪切速率范围内,研究蒸气相饱和度、泡沫剂质量分数、温度和蒸气干度对泡沫油体系流变特征的影响;在0～100s-1剪切速率范围内,研究热水相饱和度、泡沫剂质量分数和温度对热水油体系流变特征的影响.结果表明,泡沫油体系和热水油体系均为假塑性流体,可用幂律模型来描述,并且随着蒸气相饱和度和泡沫剂质量分数升高,泡沫油体系非牛顿性增强;随着温度和蒸气干度增大,泡沫油体系越接近为牛顿流体;随着热水相饱和度和温度升高,热水油体系越接近为牛顿流体;随着泡沫剂质量分数增加,热水油体系非牛顿性增强.  相似文献   

SH固土剂在遗址土中的渗透注浆扩散规律     

谌文武  张起勇  刘宏伟 《岩土力学》2019,40(2):429-435

风化是中国西北地区土遗址最常见的病害之一。土遗址防风化方法主要是表面喷洒和钻孔注浆。通过对不同干密度重塑土样的钻孔注浆试验,来寻找改性聚乙烯醇（SH）固土剂扩散规律,建立了SH固土剂渗透范围模型——旋转抛物体,解释了产生该渗透现象的原因,并通过计算得到了SH固土剂渗透加固土体体积以及渗透范围内SH的固含量,确定了土遗址中含该固含量的SH固土剂足以对其产生防风化的作用。利用Image J图像分析软件对SEM照片进行处理,获得了不同干密度条件下孔隙分布、孔隙分形维数和平均Feret直径。研究发现,随着干密度增大,土体渗透性减弱,其主要原因是中、大孔隙被压缩成微、小孔隙,并建议将SH固土剂渗透注浆应用于平均Feret直径大于4.98 ?m的土体。最后通过多元线性回归的方法发现,注浆量对渗透半径影响最大,其次是平均Feret直径,孔径的影响最小。  相似文献   

促根剂及水分胁迫对Cd污染异质土壤中小麦吸收、转运Cd的影响     

雷小琴  王萌  郑涵  李杉杉  陈世宝 《地学前缘》2019,26(6):95-102

为了研究促根剂与水分胁迫诱导小麦根伸长及其降低小麦对异质土壤中Cd吸收转运的影响,本研究制备了不同浓度Cd污染土壤,利用根箱法设置了3种不同土层(0~6 cm、7~12 cm及13~18 cm)下的Cd污染异质土壤,研究了3种添加比例(0.1%、0.2%和0.4%)下促根剂与3种水分胁迫诱导(60%、50%和40% MWHC)下小麦根伸长对降低小麦Cd吸收、转运的影响。结果表明：不同促根剂与水分胁迫诱导处理可以明显促进小麦根系生长,表现为小麦根系总长与根表面积的显著增加,其中促根剂促使下层(13~18 cm)土壤中小麦根系总长增加了63.2%~205.9%,水分胁迫诱导增加了69.1%~91.2%。不同促根剂处理可以不同程度增加小麦分蘖数,从而增加了小麦籽粒生物量(小麦籽粒生物量增加5.6%~50.3%);与对照相比,除了40% MWHC水分处理(WS3)外,不同促根剂与水分胁迫处理可以显著降低(P<0.05)Cd污染异质土壤中小麦茎叶与籽粒中Cd的浓度,降低范围分别为24.0%~41.5%和23.0%~42.7%,其中以添加0.4%促根剂处理效果最佳,不同处理对降低小麦籽粒Cd含量效果顺序为RA3≈RA2>WS2≈RA1≈WS1>WS3。基于上述结果,RA2和WS2在Cd异质污染农田修复中具有较大的应用价值。  相似文献   

Removal of EDTA from Aqueous Solutions Using Activated Carbon Prepared from Rubber Wood Sawdust: Kinetic and Equilibrium Modeling     

K. Anoop Krishnan  K. G. Sreejalekshmi  Sumol Varghese  T. S. Anirudhan 《洁净——土壤、空气、水》2010,38(4):361-369

Adsorptive removal of EDTA (ethylenediaminetetraacetic acid) from aqueous solution was studied using steam pyrolyzed activated carbon. Rubber wood sawdust, obtained from a local timber facility at Kodangavila, Trivandrum, Kerala, India was used as the precursor for the production of the activated carbon. Batch adsorption experiments were employed to monitor and optimize the removal process. The experimental parameters, i. e., solution pH, agitation time, initial EDTA concentration and adsorbent dosage, affecting the adsorption of EDTA onto sawdust activated carbon (SDAC) were optimized. The inner core mechanism for the interaction between EDTA and SDAC, which resulted in the adsorption process, was also discussed. The change in amount of EDTA adsorbed onto SDAC and CAC (commercial activated carbon) was compared over a wide range of pH (2.0–8.0). The maximum removal of EDTA took place in the pH range of 4.0–6.0 for SDAC and 5.0–5.5 for CAC, which demonstrates the effectiveness of the former adsorbent. Kinetic as well as equilibrium studies were performed to determine the rate constant and adsorption capacity, respectively. The adsorption kinetic data was fitted with pseudo‐first‐order kinetics and the equilibrium data was shown to follow the Langmuir isotherm model. These observations explain the formation of a monolayer of EDTA on the surface of SDAC as confirmed by the slow approach to equilibrium after 4 h of contact time. The adsorption capacity of SDAC for the removal of EDTA was 0.526 mmol/g and is seen to be greater than that of CAC and other reported adsorbents (0.193–0.439 mmol/g). Finally, it is clear that the production of steam pyrolyzed activated carbon in the presence of K₂CO₃ greatly enhanced EDTA removal and resulted in a product with possible commercial value for wastewater treatment strategies.  相似文献   

Mind,the gap in landscape‐evolution modelling     

John Wainwright  James D.A. Millington 《地球表面变化过程与地形》2010,35(7):842-855

Despite an increasing recognition that human activity is currently the dominant force modifying landscapes, and that this activity has been increasing through the Holocene, there has been little integrative work to evaluate human interactions with geomorphic processes. We argue that agent‐based models (ABMs) are a useful tool for overcoming the limitations of existing, highly empirical approaches. In particular, they allow the integration of decision‐making into process‐based models and provide a heuristic way of evaluating the compatibility of knowledge gained from a wide range of sources, both within and outwith the discipline of geomorphology. The application of ABMs to geomorphology is demonstrated from two different perspectives. The SPASIMv1 (Special Protection Area SIMulator version 1) model is used to evaluate the potential impacts of land‐use change – particularly in relation to wildfire and subsequent soil conditions, runoff and erosion – over a decadal timescale from the present day to the mid‐twenty‐first century. It focuses on the representation of farmers with traditional versus commercial perspectives in central Spain, and highlights the importance of land‐tenure structure and historical contingencies of individuals' decision‐making. CYBEROSION, however, considers changes in erosion and deposition over the scale of at least centuries. It represents both wild and domesticated animals and humans as model agents, and investigates the interactions of them in the context of early agriculturalists in southern France in a prehistoric context. We evaluate the advantages and disadvantages of the ABM approach, and consider some of the major challenges. These challenges include potential process‐scale mismatches, differences in perspective between investigators from different disciplines, and issues regarding model evaluation, analysis and interpretation. If the challenges can be overcome, this fully integrated approach will provide geomorphology a means to conceptualize soundly the study of human–landscape interactions by bridging the gap between social and physical approaches. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献