H+n(n=9,11,13)团簇离子的实验研究

报道了关于H9^ ,H11^ 和H13^ 团簇离子的实验研究结果，分析讨论了H9^ ，H11^ 和H13^ 团簇离子的形成和可能的分解途径。     

4、5-菲啉酮-9制备方法的改进

体文介绍了氧化1、10-菲啰啉制德4、5-菲啉酮-9实验方法的改进。     

总氮测定中消化剂对比色产生的干扰及消除

碱性过硫酸钾氧化——紫外分光光度法测定总氮所用的消化剂K2S2O8在220nm处有很强的吸收峰，在消解过程中应确保其分解完全，否则对比色测定严重干扰，通过消煮过程的方式不同，消煮时间、温度等条件的研究，结果表明消煮温度大于120℃，消煮时间长于30min，才能得到消除K2S2O8N的干扰的目的,NaOH溶液在220nm处也有吸光度，但加盐酸中和后即减弱，消煮液的残余碱度对比色的干扰也可以同去消除。     

多孔水泥稳定碎石组成设计

通过对多孔水泥稳定碎石材料的透水性能及强度、抗变形性与其在材料组成方面的影响因素进行对比分析 ,进行了实验方案设计及多组相关试验 ,经过对大量试验数据的回归分析 ,总结得到多孔水泥稳定碎石的组成设计方法     

9-硅蒽和9-锗蒽与烯烃杂Diels-Alder反应的理论研究

采用密度泛函理论方法在B3LYP/6-311G**水平研究了9-硅蒽和9-锗蒽与烯烃的杂Diels-Alder反应的微观机理、势能剖面,考察取代基对反应势能剖面的影响.计算结果表明,所研究反应均以协同非同步的方式进行,且Si(Ge)—C键总是先于C—C键形成.乙烯分子中C原子上的苯基取代基在热力学上对反应不利,但在动力学上的影响取决于产物中苯基与Si(Ge)原子之间的相对位置.9-硅(锗)蒽分子中Si(Ge)原子上的2,4,6-三甲基苯基取代基在热力学和动力学上均对反应不利.     

蒸压加气混凝土砌块专用砂浆配合比的研究

为解决蒸压加气混凝土砌块砌体使用过程中经常出现裂缝的问题,通过正交试验的方法研制蒸压加气混凝土砌块专用砂浆,主要以砂浆稠度、28 d砂浆立方体抗压强度为研究依据,以水泥、砂、粉煤灰、水4个因素为主要研究对象,每个因素取3个水平,分析4个因素在各自水平上对砂浆稠度及28 d砂浆立方体抗压强度的影响。试验结果表明,水用量为砂浆稠度的主要影响因素,砂用量及粉煤灰用量为28 d砂浆立方体抗压强度的主要影响因素。通过综合分析,初步确定了蒸压加气混凝土砌块专用砂浆的配合比,即水泥、砂、粉煤灰、水、羟丙基甲基纤维素、引气剂的用量分别为258、1550、62、279、0.64、0.064 kg/m3。与普通砂浆相比,该砂浆更能满足工程实际的需要,且在节能环保方面具有重要意义。     

Kinetics simulation and experimental observation of fine microstructure of 9%Ni cryogenic steel processed by QLT heat treatment

Thermo-Calc and Dictra commercial calculation software programs have been used to simulate the formation of fine microstructure of 9%Ni cryogenic steel processed by quench–lamellarize–temper(QLT)heat treatment.The calculations show many compositional fluctuations in each single-martensite lath after QLT treatment;the peak concentrations of carbon and nickel reach about 0.40%and 18%,respectively.The width of the C or Ni element-enriched zone increases when the critical lamellarizing temperature decreases or the temper temperature increases.Extending the temper time has a similar effect on the element profiles.The simulation results are in accordance with the observed fine microstructures.     

Dissolution behavior of bioactive glass ceramics with different CaO/MgO ratios in SBF-K9 and r-SBF

In the present work,we studied dissolution behavior of three glass ceramics samples each having 34 SiO2–14.5 P2O5–1 CaF2–0.5 MgF2(%wt)and ratio of CaO/MgO varying from 11.5:1 to 1:11.5 in conventional SBF(SBF-K9) and revised SBF(r-SBF) that has ionic concentration exactly equal to that of human blood plasma.For that purpose,samples were immersed in fluids for different time periods upto 25 days.Thin film XRD analysis revealed the diffusive nature of the phases on the surfaces of samples after soaking for different time periods in r-SBF.It showed the poor precipitation and small thickness of the HCAp layer on the samples as compared to that in SBF-K9,thus indicating the fitness and sensitivity of r-SBF for in-vitro characterization of samples.AAS,FTIR and EDS revealed slow bonding rate on the surfaces of the samples in r-SBF than that in SBF-K9 that showed the dependence of bond formation on the composition of the materials as well as on the physiological fluid used for in-vitro characterization.The rate of HCAp formation was slower in r-SBF due to more competitive adsorption of CO3 ions to Ca and Mg ions owing to greater amount of CO3 in r-SBF than that in SBF-K9.It shows the importance of CO3 content in the physiological fluids for the in-vitro assessment of samples.So,r-SBF is recommended to be used for assessment of samples to clearly understand their behavior in-vivo.     

基于正戊烷沥青质的温拌沥青老化动力性能

在不同老化温度和老化时间下,对温拌沥青、基质沥青进行了老化试验,测试了老化前后沥青中正戊烷沥青质含量,建立了以正戊烷沥青质含量为参数的老化动力学模型,计算了老化反应速率常数和老化反应活化能等参数,据此对比研究了温拌沥青与基质沥青的老化动力特性.研究结果表明:沥青老化遵循一级反应动力学方程,老化过程中正戊烷沥青质含量均随时间的延长和温度的升高而增大,而温拌沥青具有较低的反应速率常数和较高的反应活化能,因此抗老化性能更好.以正戊烷沥青质含量为参数的老化动力学方程,能够较好地区分温拌沥青与基质沥青老化过程的差异.     

胃癌患者基质蛋白酶-9血浆浓度的变化

通过对127例胃癌根治手术或姑息手术的患者纳入本研究,最终78例完成本实验,其中51例患者术后胃癌复发或发生转移癌,27例未发生胃癌复发或转移癌.观察病理确诊的胃癌患者术前、术后及术后6个月的MMP-9的变化.发现胃癌术后MMP-9水平均明显降低(P＜0.05);复发病例MMP-9水平则明显升高,与未复发病例相比有显著性差别(P＜0.05),达到术前水平.