An alternative exhaust manifold system, the Perforated Manifold, Muffler, and Catalyst (PMMC), is proposed to improve sound suppression while reducing engine pumping losses and exhaust emissions. One-dimensional predictions from acoustic theory are used to configure the initial design. Preliminary evaluation of the concept is based on bench tests, including an extended impedance tube set-up for...

A 75-year-old woman presented with a 5-day history of abdominal pain, constipation and vomiting. Her symptoms followed acute gastroenteritis, which was managed conservatively at another centre. She was also experiencing obscure pain in her right knee. On examination, her body mass index was 16, and she was dehydrated. Abdominal examination revealed central distention with visible bowel coils. T...

Acquired diverticula of the small intestine are rare and, in most patients, asymptomatic. They may come to the doctor’s attention incidentally, during radiographic examination or under a laparotomy performed for other reasons, or they may cause vague and unspecific chronic symptoms, or acute symptoms due to the occurrence of complications, such as intestinal occlusion, haemorrhage or perforatio...

A 26-year-old man (human immunodeficiency virus-positive and not taking highly active antiretroviral treatment [HAART]) presented to the emergency room with 2 months of malaise, 20 kg weight loss, high spiking fevers, generalized lymph nodes, night sweats, dry cough, and chest pain when swallowing. On physical examination, he had multiple cervical lymphadenopathies. Suspecting a systemic opport...

Small angle neutron scattering (SANS) and pulsed field gradient (PFG) nuclear magnetic resonance (NMR) diffusion measurements were applied to examine morphology and diffusion in dimyristoyl- plus dihexanoyl-phosphatidylcholine bicellar mixtures, either neutral or negatively charged, incorporating a Pluronic triblock copolymer (F68). Negatively charged bicellar mixtures, doped with dimyristoylph...

Open cell, lattice truss structures have been made by folding perforated 6061 aluminium alloy sheets. Simple air brazing is used to construct sandwich panels with cellular core relative densities between 0.02 and 0.08. Some panels were quenched and aged while others were tested in an annealed condition. The measured peak compressive strengths varied from 0.7 to 20 MPa, increasing with core rela...

BACKGROUND AND STUDY AIMS Many medical institutions in Japan perform endoscopic mucosal dissection (ESD) to treat early gastric cancer. Perforations can occur during ESD, and clipping has been reported as useful for treating small pinhole perforations. However, it is often difficult to close postoperative perforations because they usually have large diameters, and the muscle layer around the pe...

Today, high resolution electron microscopy is seriously limited by the noise which results from the irregularity of the substrates used. For example, this limitation is of particular significance in recent attempts (1) to elucidate by electron microscopy the nucleotide sequence of D N A by chemical at tachment of base-specific, heavy metal markers. The following technique was originally develop...

Pedestrian bridge structures are usually sensitive to the effects of wind due to their relatively high slimness and low weight. The arising forces can excite both oscillation in the direction of the wind and also crosswise torsion-flexure oscillation which can result in a local or (in the case of coupled torsion-flexure oscillation) complete loss of aerodynamic stability of the structure. This ...