The proton exchange membrane (PEM) fuel cell is being investigated as an alternate power source for various applications like transportation and emergency power supplies. The paper presents a novel circuit model for a PEM fuel cell that can be used to design and analyze fuel cell power systems. The PSPICE-based model uses bipolar junction transistors (BJTs) and LC elements available in the PSPI...

Several imaging modalities have been introduced over recent years to better screen for and stage breast cancer. Positron emission mammography (PEM) has been approved by the US Food and Drug Administration and introduced into clinical use as a diagnostic adjunct to mammography and breast ultrasonography. PEM has higher resolution and a more localized field of view than positron emission tomograp...

Among a number of alternative energy sources, hydrogen is treated as one of the most promising candidates, due to the reason that it can be applied to a fuel cell as an input to provide electricity through an electrochemical reaction. On top of that, high conversion efficiency up to 40 to 60% is seen in a fuel cell. The first application of a Proton Exchange Membrane (PEM) fuel cell was as an a...

Objectives * Varithena 017 Investigator Group: Michael Vasquez, MD, Venous Institute of Buffalo, Amherst, NY; Antonios Gasparis, MD, Stony Brook University Medical Center, Stony Brook, NY; Kathleen Gibson, MD, Lake Washington Vascular, Bellevue, WA; James Theodore King, MD, Vein Clinics of America, Oakbrook Terrace, IL; Nick Morrison, MD, Morrison Vein Institute, Scottsdale, AZ; Girish Munavall...

BACKGROUND The aim of this study was to investigate the appropriate measures for diagnosing and treating perineal endometriosis (PEM) with anal sphincter involvement. METHODS Between January 1992 and April 2011, the clinical features, diagnosis and management of 31 patients who were diagnosed with PEM with anal sphincter involvement at the Peking Union Medical College Hospital were retrospect...

OBJECTIVE To determine the effect of a mixture of plant extracts on the adherence and retention of bacteria in dental biofilm. STUDY DESIGN Experimental study. PLACE AND DURATION OF STUDY Department of Oral Biology, Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia, from December 2009 to December 2011. METHODOLOGY For determination of adhering ability, experimental pellic...

Serological expression cloning of antigens eliciting a humoral immune response to a syngeneic mouse sarcoma identified pem (mouse placenta and embryonic expression gene) as a new member of the cancer/testis family. To identify the human homologue of pem, mouse pem sequences and pem-related expressed sequence tags from human testis were used as PCR primers for amplification using human testis cD...

The paper begins by describing how the names 'protein malnutrition' and 'protein-energy malnutrition' (PEM) developed from the local name 'Kwashiorkor'. The central feature of severe PEM is oedema; the classical theory suggests that the cause is a deficiency of protein, but other factors are also involved. In the community mild-moderate PEM is defined by deficits in growth. A distinction has to...

The techniques of patterned excitation microscopy (PEM, also referred to in the literature as structured illumination, harmonic excitation light microscopy, or laterally modulated excitation microscopy), has recently been extended to the non-linear regime, permitting a further increase in resolution breaking the Abbe diffraction limit (saturated PEM, saturated patterned excitation microscopy (S...