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In this paper the problem of practical stabilization for a significant class of MIMO uncertain pseudo-linear and pseudo-quadratic systems, with additional bounded nonlinearities and/or bounded disturbances, is considered. By using the concept of majorant system, via Lyapunov approach, new fundamental theorems, from which derive explicit formulas to design state feedback control laws, with a possible imperfect compensation of nonlinearities and disturbances, are stated. These results guarantee a specified convergence velocity of the linearized system of the majorant system and a desired steady-state output for generic uncertainties and/or generic bounded nonlinearities and/or bounded disturbances.
In this book new results on controller design techniques
for the tracking of generic reference inputs are presented. They allow the
design of a controller for an uncertain process, either continuous or
discrete-time, without zeros, and with measurable state. The controller
guarantees that the control system is Type 1 and has the desired constant gain
and poles or that the control system tracks, with a specified maximum error and
with a specified maximum time constant, a generic reference with bounded
derivative (variation in the discrete-time case), also in the presence of a
generic disturbance with bounded derivative (variation). In addition, it is
considered the case in which the reference is known a priori.
The utility and the efficiency of the proposed methods are
illustrated with attractive and significant examples of motion control and temperature
This book is useful for the design of control systems,
especially for manufacturing systems, that are versatile, fast, precise and
Most American anthology and canon revision has focused on author and text selections but little on the anthology editorial apparatus. The following study responds to this gap by analyzing gender representation across prefaces and overviews of the Norton and Heath American anthologies (1979-2010). Through a combined rhetorical and corpus linguistic analysis, the study reveals disparate gender representation in these materials: women are increasingly mentioned over time, but men continue to emerge as individuals of importance while women are discussed primarily as a group. This examination suggests that the revisionist, feminist scrutiny of Norton and Heath inventory has not been brought to bear on the anthologies’ apparatus—and that discursive patterns therein remain largely invisible despite that they contradict efforts to revise gender bias in anthologies. In so doing, the study offers an exploratory analysis of new methods (combined linguistic and rhetorical analysis) and new sites (apparatus texts) for examining gender in canonical and pedagogical materials.
Hepatorenal syndrome (HRS) is a grave complication of
end-stage liver disease and is associated with a very high mortality.
This case report described a 42-year-old female with advanced
alcohol-induced cirrhosis who developed HRS that was initially treated with
Midodrine and Octreotide but renal function continued to deteriorate.
Vasopressin therapy was added and HRS was successfully reversed. There are few data
available on the use of vasopressin for HRS and this case supports its use in
treatment of HRS, particularly in countries where the more widely studied
Terlipressin is unavailable. This case also demonstrates that a patient failing one
medical therapy for HRS may respond to an alternative or adjunctive therapy. Therefore, this
should be attempted to increase the patient’s chance of survival.
Lights and siren are frequently used by Emergency Medical Service
(EMS) groups to reduce response times and increase a patient’s
chance for survival. However, the use of lights and siren in EMS patient
transport has been associated with occasional inappropriate use, higher crash
rates involving the ambulance, and a potential “wake effect” increasing crash
rates in ambient traffic. This study examines types of patient illnesses and
their involvement with either emergency (lights and siren engaged) or
non-emergency transport. Patient care records were analyzed from a
five-year period from a private medical transportation company. A binary
logistic regression model was built to predict the transportation
mode (lights and siren or non-emergency-mode) most likely to accompany each
unique primary patient illness. Patient illnesses were identified that showed a
higher probability of transport using lights and siren. Fifteen illness descriptions
were identified from the records as being more likely to result in emergency
mode travel, including airway obstruction, altered level of consciousness,
breathing problems, cardiac arrest, cardiac symptoms, chest pain, congestive
heart failure/pulmonary embolism, heart/cardiac, obstetrics, respiratory
arrest, respiratory distress, stroke/cerebrovascular accident,
trauma, unconscious, and patients where data was not entered. The patient
illnesses associated with lights and siren were not limited to cardiac conditions
and symptoms, which suggest that response-time goals based solely on cardiac
arrest patients may need to be expanded to include other illnesses such as
respiratory conditions. Expanded studies could assess whether or not
lights and sirens result in a clinically significant time savings across the
spectrum of illnesses that are currently being transported using lights and
siren. The list of illnesses identified here as more commonly utilizing lights
and siren could be useful to untrained EMS or dispatch workers to assist in
minimizing unnecessary emergency mode travel, thereby increasing safety for EMS
workers, patients, and the general public.
We introduce a new geometric tool called n-compass and
show that the famous theorem of Mascheroni and Mohr remains valid if the
traditional compass is replaced by the newly introduced tool.
The main purpose of this note is to investigate
equiangular polygons with rational edges. When the number of edges is the power
of a prime, we determine simple, necessary and sufficient conditions for the
existence of such polygons. As special cases of our investigations, we settle
two conjectures involving arithmetic polygons.