50 research outputs found

    Some harvesting system transforming energy wastes of compressed air to electricity

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    Energy harvesting devices are self-powered systems which are associated with input ambient energy and convert such energy to electrical one. In this study, we focus on input ambient energy deriving from compressed air. Using arbitrary pneumatic machine, the compressed air after work - with its typical parameters as overpressure 6 bar or higher and variable volume flow - is exhausted to atmosphere. This generates energy losses. We have constructed some device which transforms the loss of compressed air energy to electricity. It illustrates the principle of action very well and does not perturb operation of pneumatic machines being source of energy losses

    Hepatocellular carcinoma - diagnosis and treatment

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    Rak wątrobowo-komórkowy najczęściej jest następstwem wirusowego zapalenia wątroby. W ciągu ostatnich dekad wskaźniki zachorowalności i umieralności zwiększają się. U większości chorych nowotwór rozpoznaje się w zaawansowanym stadium. Możliwość określenia populacji o zwiększonym ryzyku wystąpienia nowotworu uzasadnia prowadzenie u chorych z marskością programu wczesnego wykrywania za pomocą obrazowania wątroby w odstępach 6-miesięcznych. Rozpoznanie powinno być oparte na ocenie stanu klinicznego łącznie z obrazowaniem i badaniem mikroskopowym. Resekcja jest leczeniem z wyboru u chorych z ograniczeniem choroby do jednej okolicy wątroby i jej prawidłową czynnością oraz nieobecnością cech wrotnego nadciśnienia. Przeszczepienie wątroby stanowi najlepszą metodę w przypadku niewielkich zmian stwierdzonych w przebiegu marskości wątroby. Chemioembolizacja i termoablacja są skutecznymi metodami postępowania w przypadku niewielkich zmian o średnicy do 3 cm w przypadku braku możliwości ich resekcji lub przed transplantacją wątroby. Systemowa chemioterapia ma niewielką wartość, natomiast zastosowanie sorafenibu - drobnocząsteczkowego inhibitora angiogenezy - może przedłużyć czas przeżycia u wybranych chorychHepatocellular carcinoma usually is a consequence of underlying viral hepatitis. Both, the incidence and mortality rates have increased in recent decades. The majority of patients are still diagnosed with advanced disease. The identifiable population at risk of development malignancy makes early detection a realistic possibility and every 6 months liver imaging is currently recommended for patients with cirrhosis. The diagnosis should be based on clinical findings together with radiologic imaging and microscopic examination. Resection is preferred treatment for patients with the disease confined to one region of the liver and preserved hepatic function with no evidence of portal hypertension. Liver transplantation is the best option for small lesions found in cirrhosis. Chemoembolization and thermoablation are effective methods of treatment of small - up to 3 cm in diameter - lesions in patients who otherwise are not candidates for resection or as a bridge to liver transplantation. Systemic chemotherapy is of marginal value, whereas the use of sorafenib - a small-molecule angiogenesis inhibitor - may prolong survival in well-selected patients

    Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

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    A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

    Measurement of the charge asymmetry in top-quark pair production in the lepton-plus-jets final state in pp collision data at s=8TeV\sqrt{s}=8\,\mathrm TeV{} with the ATLAS detector

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    Measurements of top-quark pair differential cross-sections in the eμe\mu channel in pppp collisions at s=13\sqrt{s} = 13 TeV using the ATLAS detector

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    Search for single production of vector-like quarks decaying into Wb in pp collisions at s=8\sqrt{s} = 8 TeV with the ATLAS detector

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    Measurement of the W boson polarisation in ttˉt\bar{t} events from pp collisions at s\sqrt{s} = 8 TeV in the lepton + jets channel with ATLAS

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    Charged-particle distributions at low transverse momentum in s=13\sqrt{s} = 13 TeV pppp interactions measured with the ATLAS detector at the LHC

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    Measurement of the bbb\overline{b} dijet cross section in pp collisions at s=7\sqrt{s} = 7 TeV with the ATLAS detector

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