氖-氦激光光纤照射治疗炎性息肉六例观察

炎性息肉或称炎症性息肉袢变，又称假性息肉，是慢性炎症性疾患的并发症之一。我们在临床工作中，对六例慢性中耳炎及慢性溃疡性结肠炎并发息肉形成，用低功率氦-氖激光光纤照射，取得满意疗效，现介绍如下：     

Preparation of polysulfonebenzylthiourea-reactive ultrafiltration plate membranes and their rejection properties for heavy toxic metal cations

The asymmetric membranes were prepared via phase inversion method, by using chloromethyl polysulfone as membrane materials, polyethylene glycol (PEG) as pore forming agent to improve the morphology and function of resultant membranes, N,N-dimethylacetamide as solvent, and water as the extraction solvent. Then the highly qualified polysulfonebenzylthiourea-reactive ultrafiltration plate membrane was prepared successively through the reactions between the chloromethyl polysulfone matrix membrane and thiourea. The thiourea-functionalized polysulfone plate reactive ultrafiltration membrane was used for the rejection of heavy toxic metal cations such as Cd²⁺ and Zn²⁺ through the coordination of the thiourea group and heavy toxic metal cations, in which the effects of the morphological and the structure of the membrane on the rejection properties were investigated. The rejection conditions, including the concentration of heavy toxic metal cations, temperature and pH of the solution had significant effects on the rejection capacity of polysulfonebenzylthiourea-reactive ultrafiltration membrane. The reactive ultrafiltration membrane containing thiourea group can be conveniently recovered by dilute hydrochloric acid for coordination of heavy toxic metal cations, which would have wide application for the treatment of waste-water-containing heavy toxic metal cations. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci 2008     

一种光伏用高升压比高效率直流变换器

以光伏为代表的新能源发电日益受到重视。为提高光伏发电系统的可靠性与发电效率,两级式光伏并网发电系统的前级DC/DC变换器对升压比和效率提出了要求。首先对FIBC拓扑的工作原理、高升压性能、低电力电子器件应力等进行详细分析,与传统Boost电路的对比结果验证了FIBC的优越性;然后建立了Boost和FIBC电路的损耗模型,给出了额定工况下的损耗分布和效率,结果表明同电路参数下FIBC具有更高的效率;接着利用交错控制技术,对FIBC电感参数进行了优化,进一步提高变换器效率;最后给出Boost与FIBC和优化FIBC在不同工作电流下的效率曲线,结果表明优化后FIBC效率提高明显,比Boost更适合用于低压大功率光伏发电系统中。基于Matlab/Simulink平台的仿真结果表明,使用交错技术可以优化电感参数,直流母线输出电压能够稳定在400 V。     

甘三酯指纹图谱相似度在芝麻油掺混检测中的应用

探索了HPLC-ELSD测定油脂甘三酯的方法,并测定了纯芝麻油与不同掺入比例的大豆油-芝麻油,葵花籽油-芝麻油的甘三酯指纹图谱,建立了纯芝麻油的甘三酯指纹图谱数据库。通过计算掺混油脂和纯芝麻油数据库的指纹图谱相似度,对掺混油脂进行检验。当大豆、葵花籽油的掺入量达到3%时,即可做出是否为掺混油脂的准确判定。     

Synthesis and evaluation of a metal‐complexing imprinted polymer for Chinese herbs quercetin

In this study, a metal‐complexing imprinted polymer has been prepared using the complex of Quercetin and Co(II) (Qu‐Co(II)) as template (Quercetin is a kind of flavonoid, which is a class of important active ingredients of Chinese herbs.). The polymers were synthesized in the mixed solution of methanol and tetrahydrofuran by photo‐ and thermal‐initiated polymerization, respectively. The complex ratio between Qu and Co(II), as well as the ternary complexation of Qu, Co(II), and acrylamide, was assessed in differential UV absorption spectrometry. Fourier transform infrared spectra (FTIR) were useful to verify whether the polymers prepared in two ways had the same molecular structure. The effect of initiation mode was studied by the transmission electron microscopy (TEM) and equilibrium binding experiments. Isothermal adsorption and selectivity experiments showed that molecularly imprinted polymers exhibited high affinity and specific recognition for Qu by introducing cobalt ion. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

中高温条件下6061-T651铝合金激光冲击强化研究

利用高功率、短脉冲Nd∶YAG激光对6061-T651铝合金进行表面冲击强化处理,并分别在200℃、300℃、400℃和500℃的温度下对其进行性能测试,从残余应力、显微硬度和微观组织等方面分析了激光冲击处理(LSP)对其在高温条件下性能的影响。研究结果表明中高温条件下激光冲击6061-T651铝合金的强化效果明显。200℃和400℃时试件的最大残余压应力出现在次表层,且温度越高残余压应力释放得越快,激光冲击硬化层深度约为0.3mm,500℃时的晶粒平均尺寸要比400℃时的大,晶粒尺寸和强化相是提高硬度的主要原因,不连续且粗大的晶界析出物提高了6061-T651铝合金的抗腐蚀性能。     

天然气互换性判别方法研究

超深井多选用高密度饱和盐水磺化钻井液体系,本研究引入高浓度甲酸钾溶液作为钻井液基液,有效减少高密度钻井液固相含量,提高钻井液及关键处理剂的热稳定性,同时加快超深井深部巨厚盐岩层钻井速度、减缓钻具腐蚀,充分发挥甲酸盐钻井液良好的抑制性和泥饼质量,低环空压耗等优势。讨论了重晶石在甲酸钾溶液中的溶解性以及甲酸钾溶液的抗盐抗钙污染能力,研究结果表明,重晶石在甲酸钾溶液中几乎不溶,所以在饱和盐水磺化钻井液中可用30%-70%（w）甲酸盐溶液提高基液密度,然后采用重晶石进行加重是可行的。此外,氯化钠和石膏在甲酸盐溶液中的溶解度均有不同程度的降低,可用于进一步提高磺化钻井液的抗盐抗钙污染能力。     

某极贫磁铁矿石选矿工艺试验

河北某低品位磁铁矿石全铁含量为14.60%,磁性铁为7.81%,为合理利用该资源,分别采用湿式预选—阶段磨矿—全磁选工艺流程和粗粒湿式预选—阶段磨矿—细筛—阶段弱磁选流程就矿石中磁铁矿的回收进行了选矿试验。试验分别获得了铁品位为66.19%、铁回收率为53.34%和铁品位为66.14%、铁回收率为53.40%的铁精矿,根据试验结果最终推荐湿式预选—阶段磨矿—细筛—阶段弱磁选流程为合理利用该极贫磁铁矿切实可行的选别流程。     

Improved Fatigue and Damage Tolerant Material Design for Aerospace Industry

1. IntroductionIt is generally recognized that resistance to fatiguecrack growth may be differentiated into intrinsic behav-ior and extrinsic behavior. Intrinsic behavior representsthe inherent material resistance to fatigue crack propa-gation, which may then vary with parameters such asdeformation heterogeneity, environment, and the extentof crack tip plasticity in relation to characteristic micro-structural dimensions such as grain size, secondary phaseparticle separation and/or dislocation …     

炼油废水处理采用BAF工艺的控制系统

介绍了炼油废水采用曝气生物滤池(BAF)处理工艺的工作原理,并对工艺控制系统的特点及要求作了简要介绍,控制系统采用SIMATICS7-300可编程控制器实现炼油废水处理工艺设备的控制。具体介绍了控制系统的结构、任务分配及实现、控制方式和程序设计思路,对阀类、曝气机、鼓风机和水泵采用了顺序控制、时限控制和条件控制相结合的控制原则。