OBJECTIVE To characterise electrical restitution in the intact human heart. PATIENTS AND METHODS A series of monophasic action potential electrical restitution curves were constructed from a single right ventricular endocardial site in eight patients (three men) without structural heart disease aged 52-68 (mean 55 years). A combination pacing/monophasic action potential electrode was used to ...

The global marine distributions of Cd and phosphate are closely correlated, which has led to Cd being considered as a marine micronutrient, despite its toxicity to life. The explanation for this nutrient-like behavior is unknown because there is only one identified biochemical function for Cd, an unusual Cd/Zn carbonic anhydrase. Recent developments in Cd isotope mass spectrometry have revealed...

This report presents first steps at applying chaos theory to the solar activity cycle. We provide brief reviews of the history of sunspot records, the mathematical framework of chaos theory, and solar dynamo theory. Finally, we present results of nonlinear analysis of solar motion and propose that further research focus on characterizing local Lyapunov exponents of solar dynamics.

Global Positioning System (GPS) data acquisition devices have proven useful tools for gathering real-world driving data and statistics. The data collected by these devices provide valuable information in studying driving habits and conditions. When used jointly with vehicle simulation software, the data are invaluable in analyzing vehicle fuel use and performance, aiding in the design of more a...

Design and optimization of automotive engines present unique challenges on account of the large design space and conflicting constraints. A notable example of such a problem is optimizing the fuel consumption and reducing emissions over the drive cycle of an automotive engine. There are over twenty design variables (including operating conditions and geometry) for the abovementioned problem. Co...

When an oilfield is developed with a polymer drive, the injected will play role in improving already formed dominant channel between oil and water wells, but after drive block transferred to subsequent development, inefficient circulation field of be wells again. This paper mainly applies dynamic static data, combined analysis adjustment optimization software high water-bearing oilfield, identi...

Abstract Floodplains of large alluvial rivers modulate the composition riverine organic carbon (OC) and control OC oxidative loss, constituting a critical component in global river‐atmosphere‐ocean cycle. Therefore, anthropogenic management disconnecting from their floodplains is expected to reduce loss change quality quantity exported ocean. Here, we test this idea by combining two chronometer...