Recording effective capillary pressure: a useful technique in post-pneumonectomy edema

Three cases of postpneumonectomy edema, in which hemodynamic stability was monitored with a Swan-Ganz catheter, are described. Measurement of pressure in the pulmonary capillary was based on the pulmonary artery occlusion curve. High capillary pressure and normal wedge pressure were observed in all 3 cases, suggesting that the rise in net filtration pressure as a consequence of excess flow is the pathogenic mechanism that triggers edema after pneumonectomy. We emphasize that measurement of effective pulmonary capillary pressure allows for more accurate assessment of the hemodynamic status of such patients than does the measurement of wedge pressure.     

On the input common‐mode voltage range of CMOS bulk‐driven input stages

In this paper the response of a bulk‐driven MOS Metal‐Oxide‐Semiconductor input stage over the input common‐mode voltage range is discussed and experimentally evaluated. In particular, the behavior of the effective input transconductance and the input current is studied for different gate bias voltages of the input transistors. A comparison between simulated and measured results, in standard 0.35‐µm CMOS Complementary Metal‐Oxide‐Semiconductor technology, demonstrates that the model of the MOS transistors is not sufficiently accurate for devices operating under forward bias conditions of their source‐bulk pn junction. Therefore, the fabrication and the experimental evaluation of any solution based on this approach are highly recommended. A technique to automatically control the gate bias voltage of a bulk‐driven differential pair is proposed to optimize the design tradeoff between the effective input transconductance and the input current. The proposed input stage was integrated as a standalone block and was also included in a 1.5‐V second‐order operational transconductance amplifier (OTA)‐C lowpass filter. Experimental results validate the effectiveness of the approach. Copyright © 2010 John Wiley & Sons, Ltd.     

Complex Microwave Permittivity of Secondary High Explosives

We aim to understand how microwaves interact with high explosives by studying the complex permittivity from 1–18 GHz of HMX, RDX, TNT, TATB, PETN, Octol, Comp B, 95 % RDX/5 % Viton A (PBX‐RDX), PBX 9404, PBXN‐5, PBXN‐7, PBXW‐14, PBX 9501, and PBX 9502. The combination of a resonant cavity perturbation technique for determining the room‐temperature complex dielectric constant at discrete frequencies and a wide band open circuit method (1–18 GHz) provides an accurate, broadband measurement that describes the dielectric properties in the frequency range of interest. While the values of the real and imaginary permittivity components did not vary significantly as a function of frequency, we found the real part of the permittivity to be highly dependent on relatively small changes in the material density. We used dielectric mixing theory, specifically the linear‐law approximation, to compare the predicted values based on the dielectric properties of individual components with those of the resulting formulation measured experimentally for a select number of samples; the prediction agrees well within the observed variability of the experimentally measured values.     

Example applications of the partial state model reference adaptive design technique

This paper presents an implementation methodology for adaptive control schemes. The latter have been developed bearing in mind the available theoretical results as well as the practical requirements. This leads to an adaptive control software package which can run on several digital computers, including the IBM-PC and compatibles. Simulation results involving two adaptive control benchmarks are presented.     

创建世界一流企业的思考与实践

世界一流企业具体体现在六个指标达到世界一流。我国急需创建世界一流企业。制约这一战略目标实现的瓶颈是企业的观念和机制。连云港碱厂创建世界一流企业的设想是分步实施,强化内部服务意识,发挥企业文化的作用。     

Power quality events recognition using a SVM-based method

In this paper, a novel SVM-based method for power quality event classification is proposed. A simple approach for feature extraction is introduced, based on the subtraction of the fundamental component from the acquired voltage signal. The resulting signal is presented to a support vector machine for event classification. Results from simulation are presented and compared with two other methods, the OTFR and the LCEC. The proposed method shown an improved performance followed by a reasonable computational cost.