EXPERIMENTELLE BESTIMMUNG DES DYNAMISCHEN VERHALTENS EINER KREISELPUMPE BEIM AUSLAUFEN

The primary condition of transporting liquids in pipelines is the installation of a properly matched pump. The calculations of operation parameters in both steady-state and transient flow conditions require the mathematical model of the pump. The currently used model is based on the well-known steady-state equations and characteristics of the pump [1], [2]. Both experimental results and theoretical considerations suggest that this model is inaccurate under transient flow conditions and requires further development. The first step of creating a more accurate mathematical model is to make experiments to find out how the characteristics of the pump change under transient flow conditions. The research was conducted within the framework of OTKA T029073 R& D scheme

Mucocele of the appendix: An unusual cause of lower abdominal pain in a patient with ulcerative colitis

The authors report the case of a 60-year-old male patient. In November 2001 he developed intestinal symptoms of bloody diarrhea and abdominal pain. Colononoscopy and biopsy established the diagnosis of ulcerative colitis (proctosigmoiditis). The disease activity was moderate at the beginning. No significant laboratory alterations were found (including CEA, CA19-9), and mesalazine was started orally. He was in remission until November 2003, when he was admitted to our Outpatient Clinic for upper and right lower abdominal pain and bloody diarrhea. Colonoscopy found proctosigmoiditis with a moderate activity, gastroscopy revealed chronic gastritis, laboratory data was normal. Treatment was amended with mesalazine clysma and methylprednisolone (16 mg) orally. Symptoms ameliorated; however, right lower abdominal pain persisted. US and CT examination demonstrated a pericecal cystic mass (11 cm x 3.5 cm). At first pericecal abscess was suspected, as the previous US examination (6 mo earlier) had revealed normal findings. Fine needle aspiration was performed. Cytology confirmed the diagnosis of mucocele. The patient underwent partial cecum resection and extirpation of the mucocele. He recovered well and the final histology revealed a cystadenoma of the appendix. Follow up was started. The patient is now free of symptoms. Although primary adenocarcinoma of the appendix is uncommon, the authors emphasize that preoperative diagnosis of an underlying malignancy in a mucocele is important for patient management; however, it is difficult on imaging studies

Bartók y la sección áurea

Miriam Gómez Morán (traductora)