110kV某电缆线路电缆仓漏气情况分析

本文通过对110kV某电缆线路电缆仓漏气情况回顾,结合理论及该厂家的安装工艺,详细分析了导致电缆仓漏气的原因。通过对某电缆线路终端漏气情况分析,公司在施工班组设置了专职技术员,对施工过程中关键环节储存影像资料,实现对电缆附件安装的全程质量管控与资料储存,提高记录的准确性和客观性,保证电缆附件安装的质量。     

柿霜吡哌酸粉双层缓释口腔贴膜的制备及评价

目的制备柿霜吡哌酸（PPA）粉双层缓释口腔贴膜,并对其进行质量评价。方法评价贴膜的膜外观、体外黏附力、溶解时间和口腔黏附时间,测定贴膜中PPA含量及贴膜的体外释放度,评价其体外释药行为。结果口腔贴膜的体外黏附力为137 g/cm2,溶解时间为22.74 min,口腔黏附时间为23.59 min。含量测定结果显示,PPA量在0.18~0.54 mg/mL之间有良好的线性关系（r=0.9965）,回收率为100.54%,RSD=0.78%（n=6）。体外释药行为符合一级动力学方程。结论柿霜PPA粉双层缓释口腔贴膜处方及制备工艺合理可行,质量符合要求。     

各种掺杂剂对聚乙炔导电性的影响

三种掺杂剂对聚乙炔的掺杂结果表明:碘、无水FeCl_3掺杂的聚乙炔,其导电率较SnCl_4掺杂时为大;掺杂剂溶液浓度和聚乙炔膜的厚度对试样中掺杂剂浓度均有影响;又掺杂剂在膜表面分布均匀程度与掺杂时间有关。     

Relative influence of model assumptions and measurement procedures in the analysis of the MEG

The relative influences of several model parameters and measurement setups on the MEG are studied quantitatively. The influences of the number of grid points of the flux transformer and the accuracy of the measurements are analysed using as criterion a relative difference measure (RDM). In a similar way, using the RDM, the influence of various models is evaluated. The volume conductor, i.e. the head, is described by three different compartment models: the first model consists of concentric spheres, the second of eccentric spheres optimally fitting the individual compartments of the head, and the third consists of realistically shaped compartments. The evaluation of the influence of the model of the source on the MEG is studied by taking either one single current dipole or a set of two current dipoles. The RDM described in the paper is shown to be a valuable measure in the quantitative analysis of MEGs.     

心阻抗血流图模型中电阻的计算方法

本文是我们建立一种心阻抗血流图技术新理论的系列研究之一，是正式论文的简要快讯。本文旨在判明常用电阻公式是否适用于心阻抗血流图模型。本文研究了套在园柱形均匀导体侧表面一对接到恒流源上的供电电极在此园柱体内产生的电势、电流以及套在园柱体侧表面另一对测量电极测得的电阻；最后将所得电阻公式与常用电阻公式作了对比。     

俄歇电子能谱仪系统及其对铜快离子导体的表面研究

介绍了一台用于表面分析的饿歇电子能谱仪(AES)系统。用该系统研究了铜快离子导体CuI-Cu_2O-MoO_3-P_2O_5在AES的探针电子诱导下铜沉积的规律;并发现在这种样品表面,部分氧在电子轰击过程中被蒸发而减少,总的二次电子发射电流由于铜沉积在样品表面上面随电子轰击时间迅速改变。     

聚丁二酸乙二酯-碘化钠络合物的导电性

考查了由聚丁二酸乙二酯(PES-2,4)和NaI形成的络合物结构和导电性的关系,发现NaI主要溶解在高分子的无定形区域;PES-2,4与NaI形成的络合物体系是半结晶的聚合物电解质,其结晶体的结构类似于纯PES-2,4。NaI的加入,使聚合物的玻璃化转变温度、结晶化转变温度均升高,而结晶度和结晶速度降低。电解质的导电率随NaI浓度变化而变化,NaI浓度高,其导电率高,当[NaI]/(链节单元]=1/4(摩尔浓度比)时,电解质的导电率可达10~■S/cm(90℃),其中无定形区的导电是主要的。导电率与温度的关系偏离阿累尼乌斯方程,伹也不完全符合WLF方程,导电行为不可简单地用它们来解释。     

Response of the ECG to Short‐Term Diuresis in Patients with Heart Failure

Background: Increase in the amplitude of electrocardiogram (ECG) QRS complexes has been observed in patients treated for heart failure (HF), but the underlying mechanism has not been delineated. Also, correlation of augmentation of the QRS potentials with loss of weight has been noted in patients recovering from anasarca of varying etiology, or after hemodialysis. We assessed the effect of diuresis‐based fluid loss in patients treated for HF on the amplitude of ECG QRS complexes. Methods: This is a cohort study based on ECG and other data from a previously published investigation of patients with HF conducted at a university affiliated hospital, which used new measurements and analysis, performed by a totally blinded investigator based at another institution. Twenty‐one patients (10 men) aged 70.5 ± 12.7 years, 13 with ischemic, and 8 with nonischemic cardiomyopathy, were admitted to the hospital for management of exacerbated HF and were observed for 48 hours. The patients received diuresis, and had routine laboratory testing, documentation of the net fluid lost, and recording of ECGs prior to the initiation of therapy and at 24 and 48 hours. Percent change (%Δ) over the course of observation in the sums of the amplitude of QRS complexes from 12 leads (ΣQRS₁₂), 6‐limb leads (ΣQRS₆), and leads 1 + 2 (ΣQRS₂) in mm of standard ECGs were correlated with net fluid loss corrected for admission weight in mL/kg. Results: Fluid loss amounted to 3204.9 ± 1399.5 mL in the course of 40 ± 23 hours of diuresis. ΣQRS₁₂ was 160.9 ± 42.3 mm before and 170.0 ± 50.7 mm after diuresis (P = 0. 024). Percent change in ΣQRS₁₂, ΣQRS₆, and ΣQRS₂ correlated well with the net fluid loss (r =?0.70, ?0.82, ?0.61, and P = 0.002, 0.0005, 0.001) correspondingly. Conclusion: Changes in sums of the amplitude of QRS complexes of the standard ECG correlates well with net fluid loss in response to short‐term diuresis in patients with HF. Change in the ΣQRS₁₂, ΣQRS₆, and ΣQRS₂ from ECGs before and after diuresis can be used as an easily obtainable and universally available bedside index of the net fluid loss experienced by bedridden patients with HF undergoing therapy.     

Systematics in Bi-2201, -2212 and -2223 superconductors studied by positron annihilation radiation measurements

Positron lifetimes in Bi₂Sr₂Ca_(n−1)Cu_nO_(2n+4+δ) or Bi-22(n−1)n superconducting compounds for n=1, 2 and 3 have been determined from positron annihilation lifetime (PAL) spectroscopy of associated γ-radiations. Bulk lifetime is shown to increase systematically with increase of n, the number of CuO₂-layers in the Bi-22(n−1)n compound. Positron annihilation probing of structural units of this perovskite-like crystal system has thus been demonstrated.