燃料添加剂对柴油机烟粒燃烧的影响

考察了燃料添加剂对降低柴油机烟粒燃点温度的效应。含金属添加剂的柴油机烟粒被收集在金属纤维过滤器上,把原状烟粒样品移入实验室反应器,用模拟柴油机排气进行燃烧试验。实验结果表明,当烟粒中含有Pd或Cu时,烟粒的燃点温度可降至430℃左右(普通柴油机烟粒的燃点温度约600℃);Pd的添加还可大大降低烟粒一次燃烧产物中CO的分率。文中还对金属(催化剂)/烟粒接触程度和添加剂溶液中可燃性部分对烟粒燃烧的影响作了讨论。     

三维高频心电图诊断实验性心肌缺血

采用先进的信号平均技术和窄带数字滤波方法,用计算机建立“时间-频率-波幅”三维高频心电图。12只家兔的实验结果表明:对诊断心肌缺血,150～190Hz频段最敏感,在三维图上表现为此段内以某一频率为中心的凹陷。对于普通心电图诊断不出的某些轻度心肌缺血与损伤可以用此“时间-频率-波幅”三维高频心电图诊断出来。实验结果与电镜、光镜病理观察结果符合良好。应用本方法对少量正常人和临床病例进行初步研究,取得了较有意义的结果。     

Small-computer procedure for optimal filtering of haemodynamic data

Most reported methods dealing with the optimal filtering of haemodynamic data are based on computationally onerous procedures and pay little attention to execution speed. In the paper the problem of filtering noisy aortic flow and pressure waveforms is considered and the possibility of applying a Kalman filter technique, which does not require a prèliminary identification of the signal generation process, is discussed. The basic hypothesis is that, in a cardiac cycle, the waveforms considered can be described by functions which permit Taylor series expansion. Thus the signal model is easy to obtain and the filtering procedure is fast, even if implemented on a minicomputer. The filter was applied to flow and pressure signals simultaneously measured in the canine ascending aorta under different physiological conditions. The filter performance is described and discussed.     

用微孔过滤法测定红细胞变形性──发展现状综述

文中扼要地评价近 １０年来采用核孔滤膜研究红细胞变形性的各种方法以及日本新研制的镍网。着重分析各种数据处理方法，并对研制与使用有关仪器时应注意的问题做了讨论。     

The use of tinted contact lenses in a case of congenital rod monochromatism

The use of red tinted soft contact lenses in a case of rod monochromatism was found to provide greatly improved visual function. The main advantages were better glare reduction than spectacles, improved perception of objects and patterns, and better cosmetic appearance than spectacles, resulting in greater self confidence.     

Enhanced ECG Signal-Averaging Techniques: New Applications and Improved Performance

Background: The signal-averaged ECG is a widely used and accepted technique for analysis of low-level cardiac signals. This article reviews a new and enhanced form of ECG signal averaging: the time-frequency plane Wiener (TFPW) filter. Methods: The TFPW filter accelerates the process of noise reduction. It facilitates use of signal averaging in settings previously unexplored with the technique, where a limited number of beats may be available. Conclusion: Example applications of the TFPW filter include improved analysis of ventricular late potentials and analysis of dynamic events, such as transient ischemia.     

双时值QRS波检出电路

本文介绍了一种结构简单，性能可靠的ＱＲＳ波检出电路，它使用两个不同时间常数的峰值检测器，一个作为阈值控制，另一个作为触发信号。由于将滤波后心电信号的多峰波形转换成单峰波形，避免了带通滤波器振铃效应引起的误触发。     

Vena cava filter insertion and angiographic diagnosis of pulmonary embolism

Insertion of a vena cava filter is a therapeutic alternative for patients in whom anticoagulation is not effective or appropriate. The Greenfield filter is associated with a 95% long-term patency rate and a low incidence of mortality or recurrent embolization. Although insertion can be done through the femoral or jugular route, the right femoral vein is the easiest, most direct approach to the inferior vena cava (IVC). Pulmonary arteriography remains, the “gold standard” for establishing the diagnosis of pulmonary embolism.     

再论翻盘过滤机的故障处理及技改

分析过滤机发生故障的原因,介绍过滤机滤盘压紧装置、翻盘叉、加料斗、托轮组等主要故障部位改造情况。改造后,因开车率提高,过滤强度提高,磷酸产量提高５０％以上;磷石膏洗涤率提高３％～４％,每年可增加纯收入２００～４００万元;设备运行费用大幅降低。最后提出过滤机尚存在需要解决的问题。     

Comparative bioavailability: A new type ofin vitro-in vivo correlation exemplified by prednisone

The average time to reach half-maximal plasma concentration of prednisolone and the average plasma concentrations of prednisolone at 0.5 and 1 hr obtained from three crossover bioavailability studies, involving testing of commercially available 5-mg prednisone tablets, were highly correlated (r0.88) with parameters derived from in vitrotablet dissolution rates performed in the spin filter apparatus of Shah. The in vitroparameters were the times to dissolve 16% or 50% of the labeled amount of prednisone or the percent of the labeled amount of prednisone dissolved in 20 min in water at 37C. Such correlations may be useful in the setting of in vitrodissolution rate specifications for commencal prednisone tablets.Supported by Contract FDA 69-22, Food and Drug Administration, Washington, D.C., and in part by Public Health Service Grant 5-P11-GM15559.