胶结颗粒接触力学特性测试装置研制   总被引：5，自引：2，他引：3  

蒋明镜  孙渝刚  李立青 《岩土力学》2011,32(1):309-315

为验证天然结构性砂土离散元模拟中接触模型及其参数的合理性,设计了一套用于理想胶结颗粒成型及实现不同加载条件下接触力学特性测试装置。通过胶结颗粒成型装置在两大小相同的铝棒间形成具有特定几何尺寸的胶结物,随后,采用一系列辅助加载装置实现简单及复杂加载条件下胶结颗粒接触力学特性的测试。试验结果表明：该装置可用于胶结颗粒在不同加载条件下接触力学特性的测试,实测胶结颗粒接触力学响应与天然砂土离散元中接触模型基本相符,且其抗剪和抗扭强度均随着法向压力的增大而增大,在三维应力空间中胶结颗粒强度包线呈椭圆抛物面状。  相似文献   

Biosorption behavior and mechanism of lead (II) from aqueous solution by aerobic granules (AG) and bacterial alginate (BA)     

WANG Lin  LI Yu 《中国海洋大学学报(英文版)》2012,11(4):495-500

Lead(Pb) and its compounds are common pollutants in industrial wastewaters.To develop appropriate Pb 2+ treatment technologies,aerobic granules(AG) and bacterial alginates(BA) were studied as alternative biosorbents to remove Pb 2+ from aqueous solutions.The biosorption mechanism of AG and BA were further analyzed to determine which functional groups in AG and BA are active in Pb 2+ biosorption.In this paper,the Pb 2+ biosorption behavior of AG and BA was respectively investigated in batch experiments from the perspectives of the initial pH,contact time,and initial Pb 2+ concentration.The results showed that biosorption of Pb 2+ by AG and BA occurred within 60min at the initial Pb 2+ concentrations(0 150 mg L-1).The actual saturated Pb 2+ biosorption capability of AG was 101.97 mg g-1(dry weight of aerobic granular biomass).When the initial pH was 5,the biosorption capability of AG and BA was highest at the initial Pb 2+ concentrations(0 20mg L-1).During the process of Pb 2+ biosorption,K +,Ca 2+,and Mg 2+ were released.The Ion Chromatography(IC) and Fourier Transform Infrared Spectroscopy(FTIR) further highlighted the main role of ion exchange between Ca 2+ and Pb 2+ and sequestration of Pb 2+ with carboxyl(-COO) of AG and BA.This analogical analysis verifies that BA is responsible for biosorption of Pb 2+ by AG.At the same optimal pH,AG cultivated with different carbon source has different Pb 2+ biosorption capacity.The Pb 2+ biosorption by AG with sodium acetate as the sole carbon source is higher than AG with glucose as carbon source.  相似文献   

Effect of the Organic Matter to Ammonia Ratio on Aerobic Granulation during 4‐Chlorophenol Degradation in a Sequencing Batch Reactor          下载免费PDF全文

Víctor Manuel Arellano‐Badillo  Iván Moreno‐Andrade  Germán Buitrón 《洁净——土壤、空气、水》2014,42(4):428-433

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健脾祛湿颗粒联合卡泊三醇软膏治疗银屑病湿热蕴阻证50例          下载免费PDF全文

刘少芬  郭岱炯  杨玉峰 《应用海洋学学报》2023,39(11):8

目的:观察健脾祛湿颗粒联合卡泊三醇软膏治疗银屑病湿热蕴阻证的临床疗效,以及对患者血清白细胞介素-17（IL-17）、白细胞介素-23（IL-23）水平的影响。方法:选取银屑病湿热蕴阻证患者150 例,采用随机数字表法将其分为治疗组、对照1组及对照2组,每组各50 例。对照1组采用外涂卡泊三醇软膏联合口服复方甘草酸苷片治疗,对照2组采用外涂卡泊三醇软膏治疗,治疗组在对照组2组的基础上加服健脾祛湿颗粒,3组均治疗8周。比较3组治疗前、治疗4 周、治疗8 周后银屑病皮损面积与严重指数（PASI）评分、皮肤病生活质量指数（DLQI）评分及血清IL-17、IL-23水平,并进行安全性评价,于治疗结束后第 4 周随访复发情况。结果：总有效率治疗组为96.00%（48/50）,高于对照1组的92.00%(46/50)及对照2组的82.00%(41/50),差异均有统计学意义（P＜0.05）。治疗4周后及8周后,3组PASI、DLQI评分及血清IL-17、IL-23水平均较治疗前下降,且治疗后同时间节点治疗组均优于对照1、2组（P＜0.05）。治疗过程中,3组均未出现明显不良反应。复发率治疗组低于对照1、2组（P＜0.05）。结论：健脾祛湿颗粒联合卡泊三醇软膏治疗银屑病湿热蕴阻证疗效显著,能改善患者临床症状,降低患者PASI、DLQI评分以及血清IL-17、IL-23水平,且无明显不良反应,复发率亦较低,值得临床推广应用。  相似文献