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Abstract  

A field unit was installed in the city of Debrecen (East Hungary) during the summer of 2008 to monitor urban atmospheric fossil fuel CO2. To establish a reference level simultaneous CO2 sampling has been carried out at a rural site (Hegyhátsál) in Western Hungary. Using the Hungarian background 14CO2 observations from the rural site atmospheric fossil fuel CO2 component for the city of Debrecen was reported in a regional “Hungarian” scale. A well visible fossil fuel CO2 peak (10–15 ppm) with a maximum in the middle of winter 2008 (January) was observed in Debrecen air. Significant local maximum (~20 ppm) in fossil fuel CO2 during Octobers of 2008 and 2009 was also detected. Stable isotope results are in agreement with the 14C based fossil fuel CO2 observations as the winter of 2008 and 2009 was different in atmospheric δ13C variations too. The more negative δ13C of atmospheric CO2 in the winter of 2008 means more fossil carbon in the atmosphere than during the winter of 2009.

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Journal of Radioanalytical and Nuclear Chemistry
Authors:
Mihály Molnár
,
László Palcsu
,
Zoltán Major
,
Éva Svingor
,
Mihály Veres
, and
Tamás Pintér

Abstract  

Investigation of the effect of nuclear fuel rods to the composition of the dissolved gas in the cooling water of the cooling ponds of Paks Nuclear Power Plant is presented. Dissolved gases in coolant were measured for surveying the condition of the nuclear fuel remained in service pool No. 1 of reactor unit No. 2 after its incident in April of 2003. Two different experimental ways were applied in parallel for ensuring the better reliability of the results.

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Journal of Radioanalytical and Nuclear Chemistry
Authors:
Mihály Molnár
,
László Palcsu
,
István Futó
,
Éva Svingor
,
Zoltán Major
,
Mihály Veres
,
Péter Ormai
, and
István Barnabás

Abstract  

To obtain reliable estimates of the quantities and rates of the gas production in L/ILW a series of measurements was carried in the last 7 years in Hungary. The typical gas production rates were 0.05–0.2 STP litre gas/day for CO2 and CH4 generation, and less for H2. No explosive gas mixture was indicated in the L/ILW drums during the investigated storage period. Compositions of headspace gases in closed L/ILW vaults were in agreement with gas generation processes observed in L/ILW drums. The stable carbon isotope measurements show that the main source of the CO2 gas is the degradation of organic matter and indicates microbial degradation processes as the main sources of CH4. Typical tritium activity concentrations were <10 Bq/l gas in the drums and <1,000 Bq/l gas in the vaults. Typical 14C activity values of the headspace gases were <2.0 Bq/l gas in the drums and <1,000 Bq/l gas in the vaults.

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Extracranialis carotis aneurysmák korszerű kezelése

Management of extracranial carotid artery aneurysm

Orvosi Hetilap
Authors:
Áron Nyilas
,
Zsolt Palásthy
,
Zsuzsanna Mihály
,
Enikő Veres-Lakos
, and
Zoltán Szeberin

Összefoglaló. Bevezetés: Az extracranialis carotis aneurysma rendkívül ritka, változatos etiológiájú kórállapot, ellátása nagy kihívást jelent. Célkitűzés: A carotisaneurysma invazív kezelésével kapcsolatos perioperatív és hosszú távú tapasztalataink elemzése. Módszer: A Semmelweis Egyetem Szív- és Érgyógyászati Klinikáján és a Szegedi Tudományegyetem Sebészeti Klinikáján az elmúlt 13 évben carotisaneurysma miatt végzett beavatkozások adatait gyűjtöttük össze retrospektív módon. Elemeztük a betegek anamnesztikus adatait, az aneurysmák karakterisztikáját és a terápiás modalitásokat, valamint a rövid (<30 nap) és hosszú távú eredményeket. Eredmények: Carotisaneurysma miatt 25 beavatkozás történt. A betegek átlagéletkora 57,8 ± 15,15 év, a férfi/nő arány 10/15 volt, 17 (68%) beteg volt tünetes. Az aneurysmák átlagos átmérője 26,8 ± 11,25 mm volt. A kóreredet 11 esetben (44%) atherosclerosis, 4 esetben (16%) arteria carotis interna műtét utáni állapot, ugyancsak 4 (16%) esetben fertőzés, 6 esetben (24%) pedig egyéb ok (kötőszöveti betegség, dissectio és trauma) volt. Tizenkilenc esetben végeztünk nyitott, hat esetben endovascularis műtétet. A korai halálozás 4% (egy eset) volt. Az átlagos hospitalizáció 4,52 ± 2,38 nap volt. Reoperációra három betegnél (12%) került sor. Négy esetben (16%) észleltünk perifériás idegi károsodásra utaló tüneteket, mindet nyitott műtétek után. Korai posztoperatív stroke nem történt. Az átlagos utánkövetési idő 41,2 ± 38,54 hónap volt, melynek során további öt páciens (24%) hunyt el. Az operált nyaki verőérrel összefüggésben álló haláleset nem volt. Egy stroke, egy tranziens ischaemiás attak (TIA) történt, valamint két esetben tünetmentes graftelzáródás igazolódott. Következtetés: A carotisaneurysma kezelésében a hagyományos műtéti megoldásoknak és az endovascularis eljárásoknak egyaránt létjogosultságuk van. A változatos etiológia és a betegség ritka előfordulása miatt centrumokban történő, egyénre szabott ellátás javasolt. Orv Hetil. 2019; 160(21): 815–821.

Summary. Introduction: Aneurysm of the extracranial carotid artery is a rare condition and there is a diversity in the etiology. The proper treatment could be a real challenge for the surgeons. Aim: Analysis of perioperative and long term results of invasive treatment for carotid artery aneurysm. Method: A retrospective review was conducted of patients who had open or endovascular surgery due to carotid artery aneurysm through the last 13 years at the Department of Vascular Surgery of the Semmelweis University and at the Department of Surgery of the University of Szeged. Medical history, characteristics of the aneurysms, therapy and the follow-up results were reviewed. Results: Over the study period, 25 interventions were performed due to carotid artery aneurysm. There were 10 men and 15 women with a mean age of 57.8 ± 15.15 years. Seventeen patients (68%) were symptomatic. The mean aneurysm diameter was 26.8 ± 11.25 mm. The underlying etiology was atherosclerosis in eleven (44%), prior carotid endarterectomy in four (16%), infection in four (16%) and other cause (connective tissue disease, dissection, trauma) in six (24%) cases. Nineteen patients underwent open surgery, six underwent endovascular treatment. Death within 30 days was documented in one (4%) case. The mean postoperative hospital stay was 4.52 ± 2.38 days. Three (12%) patients required reintervention postoperatively. Peripheral nerve injuries were detected in four (16%) patients, all after open surgery. No stroke was documented within 30 days. The mean follow-up was 41.2 ± 38.54 months. Five (24%) deaths were not related to the carotid artery disease. One patient had stroke, one had transient ischaemic attack (TIA), and in two cases asymptomatic internal carotid artery occlusion was described. Conclusion: Both open surgery and endovascular intervention can be safely applied in the treatment of carotid artery aneurysm. Considering the variable etiology and rarity, we recommend to perform the interventions in vascular surgery centres. Orv Hetil. 2019; 160(21): 815–821.

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