Time Delay Feedback Control based Chaos Stabilization in Current Mode Controlled DC Drive System

This paper focuses on delay feedback control scheme to eliminate chaos in a current mode controlled DC drive system. The delay feedback method is applied for the current mode DC drive system which exhibits chaotic behavior for some parameter variations to control the chaos in DC drive system. Firstly, the change of system behavior from normal to chaotic operation is shown by changing some parameters. To control the chaos in current mode DC drive system, the controller designed based on time delay feedback control method is applied to DC drive system which works in chaotic regime. It is showed that the behavior of system changes from chaotic regimes to normal operation by applying the time delay feedback control

Acne-Associated Syndromes

Introduction: Acne, a chronic inflammatory disorder of pilosebaceous unit, is characterized by comedones, pustules, papules, nodules, cysts, and scars. It affects nearly 85% of adolescents. High sebaceous gland secretion, follicular hyperproliferation, high androgen effects, propionibacterium acnes colonization, and inflammation are major pathogenic factors. Systemic disease or syndromes that are associated with acne are less commonly defined. Therefore, these syndromes may not be usually recognized easily

Deep electronic states in ion-implanted Si

In this paper we present an overview of the deep states present after ion-implantation by various species into n-type silicon, measured by Deep Level Transient Spectroscopy (DLTS) and high resolution Laplace DLTS (LDLTS). Both point and small extended defects are found, prior to any anneal, which can therefore be the precursors to more detrimental defects such as end of range loops. We show that the ion mass is linked to the concentrations of defects that are observed, and the presence of small interstitial clusters directly after ion implantation is established by comparing their behaviour with that of electrically active stacking faults. Finally, future applications of the LDLTS technique to ion-implanted regions in Si-based devices are outlined.</p

Graphical Evaluation of the Ridge-Type Robust Regression Estimators in Mixture Experiments

In mixture experiments, estimation of the parameters is generally based on ordinary least squares (OLS). However, in the presence of multicollinearity and outliers, OLS can result in very poor estimates. In this case, effects due to the combined outlier-multicollinearity problem can be reduced to certain extent by using alternative approaches. One of these approaches is to use biased-robust regression techniques for the estimation of parameters. In this paper, we evaluate various ridge-type robust estimators in the cases where there are multicollinearity and outliers during the analysis of mixture experiments. Also, for selection of biasing parameter, we use fraction of design space plots for evaluating the effect of the ridge-type robust estimators with respect to the scaled mean squared error of prediction. The suggested graphical approach is illustrated on Hald cement data set

Occurrence of Paradiplozoon spp. in vimba bream Vimba vimba from Lake Köyceğiz, southwest Türkiye, with new data on their distribution

Only one species of the genus Paradiplozoon (Akmerov 1974) has so far been recorded in Vimba vimba (Linnaeus, 1758) from Türkiye. This study was planned to improve the recording of the occurrence of diplozoids in V. vimba from a pristine area in a different geographical region. A total of 397 specimens of V. vimba were collected from Lake Köyceğiz by commercial fishermen over a period of one year and examined for the presence of diplozoids. Only one species of Paradiplozoon was found. Following a detailed morphological examination, the species was identified as Paradiplozoon bliccae (Reichenbach-Klinke 1961), which was subsequently confirmed by molecular data. A total of 1025 specimens of P. bliccae infected 185 of the 397 Vimba vimba specimens examined, with prevalence, mean intensity and abundance of 46.6%, 5.5 ± 4 parasites/fish, 2.5, respectively. The highest prevalence and mean abundance were determined in spring, while mean intensity values were higher in summers. Female hosts showed higher prevalence, mean intensity and mean abundance than males. This is the first report on the diplozoid P. bliccae from the locality and the first molecular characterization of P. bliccae from V. vimba in Lake Köyceğiz. This study adds to the geographical range of the species.Only one species of the genus Paradiplozoon (Akmerov 1974) has so far been recorded in Vimba vimba (Linnaeus, 1758) from Türkiye. This study was planned to improve the recording of the occurrence of diplozoids in V. vimba from a pristine area in a different geographical region. A total of 397 specimens of V. vimba were collected from Lake Köyceğiz by commercial fishermen over a period of one year and examined for the presence of diplozoids. Only one species of Paradiplozoon was found. Following a detailed morphological examination, the species was identified as Paradiplozoon bliccae (Reichenbach-Klinke 1961), which was subsequently confirmed by molecular data. A total of 1025 specimens of P. bliccae infected 185 of the 397 Vimba vimba specimens examined, with prevalence, mean intensity and abundance of 46.6%, 5.5 ± 4 parasites/fish, 2.5, respectively. The highest prevalence and mean abundance were determined in spring, while mean intensity values were higher in summers. Female hosts showed higher prevalence, mean intensity and mean abundance than males. This is the first report on the diplozoid P. bliccae from the locality and the first molecular characterization of P. bliccae from V. vimba in Lake Köyceğiz. This study adds to the geographical range of the species

Is the Volume-of-Fluid Method Coupled with a Sub-Grid Bubble Equation Efficient for Simulating Local and Continuum Aeration?

ABSTRACT: Air entrainment is common in free surface flows in large hydraulic structures (e.g., spillways, chutes, energy dissipation structures) and must be considered to assure an effective and safe operation. Due to the large size of the prototype structures, it is infeasible to model individual air bubbles. Therefore, using the OpenFOAM toolbox, an efficient simulation model for aerated flows is developed for engineering purposes. The Reynolds-averaged Navier-Stokes equations and the volume-of-fluid method are coupled with a sub-grid bubble population model that simulates entrainment and transport. A comprehensive assessment of the effectiveness, computational cost, and reliability is performed. Local and continuum bubble entrainment are evaluated in two distinct flows: an impinging jet and along a spillway chute. Aeration is induced, respectively, by a shear flow and by the thickening of the turbulent boundary layer. Moreover, a detailed sensitivity analysis of the model´s parameters is conducted. Calibration and validation are performed against experimental and prototype data. Among the analyzed entrainment formulations, the one depending exclusively on the turbulent kinetic energy is the only applicable to different flow types. Good accuracy is found, meeting engineering standards, and the additional computation cost is marginal. Results depend primarily on the volume-of-fluid method ability to reproduce the interface. Calibration is straightforward in self-aeration but more difficult for local aeratio

Cirrhotic Cardiomyopathy

Cirrhotic cardiomyopathy (CCMP) is a functional disorder characterized by electrophysiologic disturbances and diastolic and/or systolic dysfunction in patients with chronic liver disease, especially those with ascites and portal hypertension. This disorder is a well-defined entity in adults, but pediatric data are limited. Clinical and laboratory findings are generally latent. The diagnostic criteria are prolonged QT on electrocardiography due to metabolic and extrahepatic causes, in addition to some abnormal echocardiography findings. If echocardiographic findings are normal and only specific prolonged QT is present, this disorder is named as “latent CCMP”; otherwise, it is “manifest CCMP.” This disorder is important because it may lead to problems such as cardiac failure and dysrhythmia before or after liver transplantation. Moreover, it may worsen the prognosis

Transmission-Line Metamaterial Design of an Embedded Line Source in a Ground Recess

A transmission-line metamaterial design of a material-embedded electric line source radiating inside a ground recess is investigated. The media embedding the recessed line source are designed such that the embedded current creates the same radiation pattern as a line source over a flat conducting ground plane. Transmission-line metamaterial unit cell designs for the embedding media obtained from the transformation electromagnetics design technique are shown. The metamaterial design of the overall embedded source configuration is numerically tested using circuit simulations. It is shown that the embedded-source design creates the same radiation characteristics as the line source above a flat ground plane at the design frequency