Microelectromechanical System for Controlling Flow Past an Airfoil: Pressure Transducers

A technology is developed for making single-chip diaphragm pressure sensors with polycrystalline-silicon piezoresistive elements on a monocrystalline-silicon substrate. It allows one to produce piezoresistive elements with a conductivity–temperature characteristic that neutralizes the temperature dependence of piezoresistive sensitivity. Sensors with a 1.8 × 1.8-mm² diaphragm are designed and fabricated by the above technology for pressures ranging from 1 to 10⁵ Pa, showing a maximum sensitivity of 10^–6 Pa^–1. The sensors are tested in aerodynamic experiments on monitoring the flow past a model wing of finite span at angles of attack close to the stall angle.     

利用电场感应器件MC33794测定液体高度

电场成像器件IC（MC33794）：Motorola公司提供行业内惟一可产生及检测低水平电场和功率并支持微控制器(MCU)的集成电路(IC)，所有这些功能均集成在单个芯片中。     

Operation of a tight joint under a torque

A tight joint subjected to a torque is considered, in the case of pliability of the joint components and tangential pliability of the contact layer. On that basis, the torque distribution over the joint length may be determined more precisely, and fretting wear may be predicted.     

利用电场感应器件MC33794测定液体高度

电场成像器件IC(MC33794)如今,设计工程师在需要非接触探测和三维(3D)电场成像的嵌入式系统中使用MC33794,可减少系统所需器件和成本。这款IC支持微控制器及多达9个简单的电极。这些电极均可独立使用,以提供在微弱电场中的物体尺寸和位置等信息。下文描述了利用此技术如何无干扰地测定液体高度。水的检测电场成像技术非常适合于非导电容器内液体高度的测定。测定工作可以在容器外完成,而且测量时无需内部或接地结构。这种方法可以测量任何介电常数的导电液体,或者介电常数比一般值大很多的非导电液体。水的测定可以通过放置于容器外的电…     

Influence of initial and boundary conditions at the nozzle exit upon diffusion combustion of a hydrogen microjet

The objective of this work is an experimental study of the influence of initial and boundary conditions at the nozzle exit upon diffusion combustion of a hydrogen microjet. It is found that the initial mean velocity profile and the presence (or absence) of a material with large heat capacity surrounding the nozzle exit may have a pronounced effect on the flame structure and combustion of the round hydrogen microjet. The rates of fuel consumption (i.e., the efflux velocities of hydrogen) providing diffusion combustion of the round hydrogen microjet, the flame detachment, and the origination of the «bottleneck flame» in the cases of a top-hat and a parabolic mean velocity profiles at the nozzle exit are determined. The variations of the extent of «bottleneck flame» with the hydrogen flow rate are made clear. Also we examine the diminution of the extent of «bottleneck flame» with the growth of hydrogen flow rate in three cases of initial conditions at the nozzle exit.     

Experience of biologically active supplements to food containing indoles and isothiocyanates in patients with chronic viral hepatitis

We have studied the effect of dietary supplement "ExPress" on clinical and biochemical parameters and on the activity of detoxification enzymes of liver in patients with chronic viral hepatitis B and C. 24 patients (19 females and 5 males aged 16-39 years) were enrolled in the study. Patients in case group received dietary supplement "ExPress" in addition to basic treatment. Average indices of total bilirubin in cases after treatment were 26.98 +/- 2.85 mmol/l, while in controls--34.31 +/- 5.72 mmol/l (p > 0.05). Average indices of alanin-aminotransferase and aspartate-aminotransferase were 78.75 +/- 11.25 and 160.75 +/- 23.67 units while in controls--208.5 +/- 56.4 and 330.25 +/- 65.14 units respectively (p < 0.05). In case group we observed full normalization of thymol test--from 9.99 +/- 1.51 to 4.03 +/- 0.73 units (p = 0.001), while in controls--from 7.9 +/- 1.56 only to 5.2 +/- 1.15 units (p = 0.194). Contents of non-metabolized antipyrine in cases decreased from 9.76 +/- 1.2% (p = 0.0002) whilst in controls--from 9.38 +/- 1.28% only to 3.93 +/- 1.18% (p = 0.01). Results of the study show that dietary supplement "ExPress" induces the activity of detoxification enzymes of liver and increases the efficiency of basic treatment.