A novel system for measuring local currents in polymer electrolyte fuel cells ͑PEFCs͒ has been developed. It has the advantages of a magnetic loop array and allows an easy and highly flexible implementation. This communication deals with our experience and the principle of measurement of this diagnostic method for the current mapping of PEFCs. The feasibility of this approach is demonstrated on a small-scale single-cell direct methanol fuel cell ͑DMFC͒. The impact of the operating conditions such as air stoichiometry or anodic flow rate on the current distribution of such a DMFC is discussed.
Intraoperative imaging performed by a video laparoscope is the gold standard during laparoscopic resections of tumors in urology. In contrast to ultrasound, laparoscopes cannot provide the surgeon with crucial information that could improve surgical outcome. Therefore, we developed a new concept for ultrasound imaging through the back of a supine patient during laparoscopic interventions. In this article we present a mock-up system to answer initial questions that were raised by the concept. The results of the performed experiments show that the concept is feasible.
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