We recorded 60 DC simultaneous electrograms from isolated porcine and canine hearts in the first minutes after coronary occlusion. Ventricular premature beats (VPB) originated from the normal side of the ischemic border, which was frequently separated from the central ischemic area showing delayed activity by a small zone of inexcitable tissue. We attempted in a computer model to generate VPB's...

As an intrinsically unbiased method, the quantum Monte Carlo (QMC) method is of unique importance in simulating interacting systems. Although QMC often suffers from notorious sign problem, problem models may be mitigated by finding better choices simulation scheme. However, a general framework for identifying optimal schemes has been lacking. Here, we propose using automatic differentiation to ...

An one-pot method has been developed for the synthesis of azo dyes via sequential diazotization–diazo coupling of aromatic amines with coupling agents at room temperature in the presence of Bi(NO3)3. 5H2O. Short reaction times, high yields, a clean process, simple methodology, easy work-up and green ‎conditions are advantages of this protocol.‎

We present a mixed-signal very-large-scale-integrated chip that emulates nonlinear active cochlear signal processing. Modeling the cochlea’s micromechanics, including outer hair cell (OHC) electromotility, this silicon (Si) cochlea features active coupling between neighboring basilar membrane (BM) segments—a first. Neighboring BM segments, each implemented as a class AB log-domain second-order ...

Early evaluation of interactive systems is currently the subject of numerous researches. Some of them aim at explicitly coupling design and evaluation by various software mechanisms. We describe in this paper two approaches of early evaluation exploiting new technologies and paradigms. The first approach is based on aspect oriented programming; the second one proposes an explicit coupling betwe...

Connexin36 (Cx36) plays an important role in insulin secretion by controlling the intercellular synchronization of Ca(2+) transients induced during stimulation. The lack of drugs acting on Cx36 channels is a major limitation in further unraveling the molecular mechanism underlying this effect. To screen for such drugs, we have developed an assay allowing for a semi-automatic, fluorimetric quant...

the analysis of the 27al and 35cl quadrupole coupling parameters of aluminum methyl chloride dimers were carried out on the basis of the density functional theory (dft). the available experimental values of quarupole coupling constants were compared with their calculated ones. in this investigation, the correlations were made between calculated 27al and 35cl nuclear quadrupole coupling constant...

tobacco is planted extensively in golestan province and high volume of its stem wastes remained without using and it is burned. as a useful purpose of these wastes and to reduce the environmental problems, in this the mechanical properties of polypropylene composites reinforced with tobacco stalk flour were studied. for this purpose, the tobacco stalk flour as the reinforcement, in three levels...

Introduction: In this study, a computer analysis method based on a block matching algorithm is presented to extract the longitudinal movement of the carotid artery wall using consecutive ultrasonic images. A window (block) is selected as the reference block in the first frame and the most similar block to the reference one is found in the subsequent frames. Material and Methods: The program was...