Based on Moore and Greitzer’s model [15], the surge behavior of axial flow compression system was found to be attributed to the appearance of Andronov-Hopf bifurcationin [12]. In this paper, we focus on the design of control law to prevent and/or delay the occurrence of the bifurcations, which will then suppress the surge behavior. Both types of linear dynamic state feedback and linear washout ...

PURPOSE To prospectively assess the accuracy of combined wash-in and washout characteristics at dynamic contrast material-enhanced multi-detector row computed tomography (CT) in distinguishing benign from malignant solitary pulmonary nodules. MATERIALS AND METHODS Institutional review board approval and informed consent were obtained. The study included 107 patients (62 men, 45 women; mean ag...

Objective: To correlate non-restricted diffusion magnetic resonance imaging (MRI) patterns of hepatocellular carcinoma (HCC), with histopathology and clinical outcome.Material Methods: We retrospectively evaluated pre-treatment MRIs showing HCC lesions (≥1-centimeter), excluding poor quality/non-available weighted (DWI). Three radiologists 37 in 27 patients, for: T1-weighted (T1W)/T2-weighted (...

I nert gas washout tests including single breath washout (SBW) and multiple breath washout (MBW) have been used for several decades across a wide age range spanning from early infancy to late adulthood. In the past, these lung function tests were typically applied in research settings, assessing lung volume and ventilation distribution in order to gain insight into presence, severity and progre...

Background: Intraoperative rectal washout is considered to be important in colorectal surgery, but it is rather difficult in laparoscopic surgery. To resolve the problem, a new device called gut-clamper have invented for complete washout of the rectum during the laparoscopic low anterior resection. Methods: Forty patients with rectal cancer underwent laparoscopic low anterior resection by a sin...

Hepatocellular carcinoma (HCC) is the fifth most common neoplasm in men and the seventh in women, with a five-year survival rate of approximately 12%. The main predisposing factor for the development of HCC is cirrhosis1, 2. In Argentina, the main etiologies for cirrhosis are alcoholism or hepatitis C virus and, with a lower prevalence, the hepatitis B virus or cryptogenic cirrhosis3. Surgery i...

The isolated cat gastrocnemius preparation was used to study the relation between the washout of Xenon measured by external monitoring and blood flow measured directly by a dropcounter. The experimental possibility was thereby tested of recording the total tracer bolus and its subsequent washout by external monitoring, using the height H and the corresponding area A of the washout curve. The pa...

Comparison of end expiratory lung volume (EELV) measured by the helium dilution technique and the nitrogen washout/ washin method. (a) The EELV measured by the helium dilution as a function of the EELV measured by nitrogen washout/washin method (EELV helium dilution = -111.85 + 0.89 × EELV GE, r2 = 0.82, p < 0.00001). (b) The BlandAltman plot of the EELV measured with the nitrogen washout/washi...

The simplest strategy for extremum seeking-based source localization, for sources with unknown spatial distributions and nonholonomic unicycle vehicles without position measurement, employs a constant positive forward speed. Steering of the vehicle in the plane is performed using only the variation of the angular velocity. While keeping the forward speed constant is a reasonable strategy motiva...