In this paper we present a time extension of Petri nets called Petri net with Time Windows (short: tw-PN) where time intervals (windows) are associated with the places. We give a formal definition for this class and compare these time dependent Petri nets with their (timeless) skeletons. In particular, we compare their sets of reachable markings and their liveness behaviour. The sets of reachab...

BACKGROUND Inhalation of thermal water (TW) is traditionally used as part of the treatment of chronic obstructive pulmonary disease (COPD), but its benefit and mechanisms are controversial. We previously observed a reduced proportion of neutrophils in induced sputum after treatment with TW. OBJECTIVES The aim of this study was to determine whether inhalation of TW in COPD patients is associat...

In this paper we are mainly concerned with TW -domains, i.e., domains in which the wand t-operations coincide. Precisely, we investigate possible connections with related well-known classes. We characterize the TW -property in terms of divisoriality for Mori domains and Noetherian domains. Speci5cally, we prove that a Mori domain R is a TW -domain if and only if RM is a divisorial domain for ea...

INTRODUCTION In Peru, transgender women (TW) experience unique vulnerabilities for HIV infection due to factors that limit access to, and quality of, HIV prevention, treatment and care services. Yet, despite recent advances in understanding factors associated with HIV vulnerability among TW globally, limited scholarship has examined how Peruvian TW cope with this reality and how existing commun...

It is still an open question in parallel discrete event simulation what conditions influence the performance of parallel simulation paradigms. We have developed a simulation environment based on asynchronous cellular automata that facilitates basic research into the concepts of discrete event simulation and parallel discrete event simulation, such as the Time Warp paradigm. We address the trans...

Gary Mulcahy is Chief Technology Officer and Co-CEO of TDI. He received his BE-EE from New York University followed by graduate study at the Polytechnic Institute of New York. Mr. Mulcahy is a recognized authority in power conversion technology and the design, development and production of power systems for maximum performance and reliability with minimal life cycle cost of ownership. JOHN SANT...

We have previously shown that a 2-chloro-1,4-naphthoquinone derivative (TW-92) induces cell death in leukemia cells. TW-92 exhibited relatively high selectivity towards primary Acute Myeloid Leukemia (AML) cells, as compared to normal mononuclear cells. In view of the selectivity of this family of naphthoquinones, novel chloroaminophenylnaphthoquinone isomers with different methyl substitutions...

BACKGROUND Inspiratory muscle weakness is a recognised cause of unexplained dyspnoea. It may be suggested by the finding of a low static inspiratory mouth pressure (MIP), but MIP is a difficult test to perform, with a wide normal range; a low MIP may also occur if the patient has not properly performed the manoeuvre. Further investigation conventionally requires balloon catheters to obtain oeso...

The TW Hydrae Association is the nearest young stellar association. Among its members are HD 98800, HR 4796A, and TW Hydrae itself, the nearest known classical T Tauri star. We have observed these three stars spectroscopically between 3 and 13 μm. In TW Hya the spectrum shows a silicate emission feature that is similar to many other young stars with protostellar disks. The 11.2 μm feature indic...