358 research outputs found

    LDEF fiber-composite materials characterization

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    Degradation of a number of fiber/polymer composites located on the leading and trailing surfaces of LDEF where the atomic oxygen (AO) fluences ranged from 10(exp 22) to 10(exp 4) atoms/cm(sup 2), respectively, was observed and compared. While matrices of the composites on the leading edge generally exhibited considerable degradation and erosion-induced fragmentation, this 'asking' process was confined to the near surface regions because these degraded structures acted as a 'protective blanket' for deeper-lying regions. This finding leads to the conclusion that simple surface coatings can significantly retard AO and other combinations of degrading phenomena in low-Earth orbit. Micrometeoroid and debris particle impacts were not a prominent feature on the fiber composites studied and apparently do not contribute in a significant way to their degradation or alteration in low-Earth orbit

    Intraocular Metastases Secondary to Breast Carcinoma Correlates With Upregulation of Estrogen and Progesterone Receptor Expression in the Primary Tumor

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    To compare estrogen (ER), progesterone (PR), and human epidermal growth factor-2 (HER2) receptor expression in the primary tumor of patients affected by choroidal metastases from breast carcinoma (BC) versus those with extraocular metastases

    Addressing the challenges of post-pandemic debt management in the consumer and SME sectors: a proposal for the roles of UK financial regulators

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    Regulatory actions for short-term debt-relief during the Covid-19 pandemic are facilitating a significant level of indebtedness. We argue that regulators, in leaving the banking sector to manage small business and consumer debtors in ‘tailored arrangements’, risk allowing financial welfare goals to be unmet. Financial welfare goals are important to the Financial Conduct Authority’s (FCA) consumer protection objective and give substantive meaning to the long-term financial stability objective of the Prudential Regulation Authority (PRA). Although the struggles with debt on the part of small and medium-sized businesses and households are not capable of complete resolution by financial regulators, who are constrained by their statutory mandates, we argue that the PRA and FCA should establish a coordinated supervisory framework of ‘tailored supervision’ for banks’ ‘tailored arrangements’ with their debtors. This proposal allows both regulators to address to an extent the needs of unsophisticated post-pandemic debtors and meet their objectives in a joined-up and holistic manner

    P.Oxy. X 1314 Verso: Che Tipo di Esercizio di Scrittura?

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    Il papiro di cui si offre qui, per la prima volta, un’edizione completa è sempre stato interpretato come un esercizio di scrittura, sin dalla sua prima presentazione come descriptum, corredata da una foto riproduzione del pezzo, nel 1914 all’interno della serie The Oxyrhynchus Papyri a cura di Grenfell e Hunt. Rinvenuto a Ossirinco, non si è invece certi dell’origine del papiro. Il pezzo potrebbe essere stato oggetto di riuso, giacché il testo latino vergato sul verso papirologico risale a un’epoca certamente successiva a quella del testo greco riportato sul recto. Le tracce di scrittura greca, che si trovano nella parte inferiore della superficie del papiro, sono molto lievi, quindi si pensa che, prima di essere riutilizzato, il papiro possa essere stato lavato. Inoltre, guardando alla forma attuale del papiro, il cui margine destro è integro, è ipotizzabile che il pezzo sia frutto di un ritaglio
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