81 research outputs found
Computational 3D resolution enhancement for optical coherence tomography with a narrowband visible light source
No full textPhase-preserving spectral estimation optical coherence tomography (SE-OCT) enables combining axial resolution improvement with computational depth of field (DOF) extension. We show that the combination of SE-OCT with interferometric synthetic aperture microscopy (ISAM) and computational adaptive optics (CAO) results in high 3D resolution over a large depth range for an OCT system with a narrow bandwidth visible light super-luminescent diode (SLD). SE-OCT results in up to five times axial resolution improvement from 8 µm to 1.5 µm. The combination with ISAM gives a sub-micron lateral resolution over a 400 µm axial range, which is at least 16 times the conventional depth of field. CAO can be successfully applied after SE and ISAM and removes residual aberrations, resulting in high quality images. The results show that phase-preserving SE-OCT is sufficiently accurate for coherent post-processing, enabling the use of cost-effective SLDs in the visible light range for high spatial resolution OCT.ImPhys/Computational ImagingImPhys/Kalkman grou
The Question of the Transfer of Evliya Celebi's Seyahatnarne (Book of Travels.) to the Topkapi Palace Library
No full textAlthough so many important studies have been carried out about the Seyahatname (Book of Travels) of Evliya Celebi until now, they haven't been benefited from Turkish archives during these studies sufficiently. Correspondingly, it is clear that lots of problems can not be clarified without using these sources. In this study, on the basis of estates, new findings have been established about how and when author's edition of Seyahatname passed to Topkapi Palace Library. Besides with the help of these estates it has been revealed that Morali Besir Aga who was one of the chief harem eunuchs possessed the author's edition and they were transported to the Palace by confiscatio
Computational 3D resolution enhancement for optical coherence tomography with a narrowband visible light source
No full textPhase-preserving spectral estimation optical coherence tomography (SE-OCT) enables combining axial resolution improvement with computational depth of focus (DOF) extension. We combine SE-OCT with interferometric synthetic aperture microscopy (ISAM) to obtain a high 3D resolution over a large depth range with a narrow bandwidth visible light super-luminescent diode (SLD). SE-OCT gives a five times axial resolution improvement to 1.5 micrometer. The combination with ISAM gives a sub-micron lateral resolution over a 300 micrometer axial range, 12 times the conventional DOF. The results show that phase-preserving SE-OCT is sufficiently accurate for coherent post-processing, enabling the use of cost-effective SLDs in the visible light range for high spatial resolution OCT.ImPhys/Computational ImagingImPhys/Kalkman grou
Editorial Technology Assessment for Addressing Grand Societal Challenges
No full textEmerging technologies are both a cause of many grand societal challenges (GSCs) facing twenty-first-century societies and an integral part of some of their most promising solutions. As an element of the GSCs, technology becomes intertwined with several interrelated issues that constitute the GSCs. This calls for approaches to Technology Assessment (TA) that account for the paradoxical role of technology in the GSCs, and the imperative and complexity of pointing technological innovation toward addressing the GSCs. In this introduction to the special issue, we identify three major streams in TA research and practice, namely TA as a policy instrument, a deliberation process, and an issue field. These streams highlight tensions between relying on experts and on the inclusion of various stakeholders in TA processes, and between a TA framing around the intersection of technology and critical issues around critical issues, such as those constituting the GSCs. We discuss the advantages and challenges of each stream. We also outline and discuss key principles for conducting TA in the context of GSCs. We end by introducing the four papers that constitute this special issue.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Engineering, Systems and Service
A Persian Intellectual in the 19th Century Ottoman Capital: Mirza Habib Isfahani and His Tereke
No full textThere exists a relatively extensive literature relating to the biography and the intellectual and political identity of the nineteenth century intellectual adversary Mirza Habib Isfahani, who spent half of his life in the Istanbul in exile, where soon after his arrival he became a celebrated figure in intellectual circles. His acclaim was a consequence of his literary scholarship as the author of a number of Persian works on grammar; his authorship of Hatt ve Hattatan; his translation of Serguzest-i Haci Baba-yi Isfehani; and his contributions to the newspaper Akhtar, the first and longestrunning Persian newspaper published in the Ottoman capital. This literary scholar was also a civil servant of the Ottoman state. By focusing on Mirza Habib Isfahani's tereke (the bequest of possessions) this articles will attempt to shed light on his biography and intellectual world. Moreover, owing to the fact that a significant part of this possessions consisted of books and manuscripts left behind by this important nineteenth-century figure, this examination will provide information pertaining to the literary legacy of Ottoman and Iranian intellectuals of the period
The Prison Memoirs of an Inebahti Veteran: Serguzestname-i Hindi Mahmud
No full textThis article introduces a memoir called the Serguzestname. This masterpiece of the genre presents the experiences and observations of a certain Hindi Mahmud during the years that served Sultan Selim II as secretary, 'qapijibashi', and 'muteferriqa.' Particularly important is its description of the Battle of Lepanto (1571), in the course of which the author was captured and enslaved by the Holy Alliance forces. Until recently this memoir was presumed lost. It cover Hindi Mahmud's experiences during the four year period in which he was imprisoned in Messina, Napoli and Rome in Sicily and Italy, his opinions about the Papacy and Vatican, the ceremonies of accession and funeral ceremonies, the religious life of prisoners of war, prison conditions etc. The information it provides is a valuable source for students of cultural history. In a second work, the comprehensive Qisas-i Enbiya written in 1579, Hindi Mahmud stated that his Serguzestname consisted of 8000 verses. But the only known surviving manuscript of the work, that preserved in Edirne's Selimiye Manuscript Library, is missing 1113 verses. Too date, the Serguzestname is the earliest captivity memoir ('esaretname') from the Ottoman period. Accordingly, even without its missing section, the Serguzestname is an extremely important document for the academic world
First case of mechanical compression by methylprednisolone crystals following transforaminal lumbar nerve root block for left sciatic pain leading to hyperesthesia and progressive weakness : A case report
No full textIntroduction: Lumbosacral nerve root blocks and epidural corticosteroid injections are commonly used for short-term pain relief among patients with degenerative spinal disc disease. Serious complications following these injections are rare, and there are only a few published papers on this subject. It is important that spine surgeons are aware of the potential complications, and the possible factors that contribute to such complications. Presentation of case: 32-year-old Lebanese female presented with progressive weakness and hyperesthesia following a transforaminal lumbar nerve root corticosteroid particulate injection. The case was managed by surgical lumbar decompression. Discussion: Neurological complications following transforaminal/selective nerve root block are the most feared of all possible associated complications with epidurals blocks. It has been hypothesized that such a complication is mainly due to a spinal cord infarct from corticosteroid crystal. However, there are no previous reports that such progressive weakness and hyperesthesia could be due to the mechanical compression caused by corticosteroid particulate crystals themselves as confirmed in the current case. Conclusions: Progressive weakness and hyperesthesia following nerve root block could be due to the effect of the corticosteroid particles used in the injectate. Such complications could be simply avoided by the use of more dilutional volume of the local anaesthetic agent and/or using a non-particulate corticosteroid in order to avoid the adherence of the corticosteroid crystals to the nerve root sheath. This is the first case of post-nerve root block neurological complications due to mechanical compression caused by corticosteroid particulate crystals.CC BY 4.0Corresponding author: Department of Surgery, Hamad Medical Corporation, Doha, Qatar. E-mail address: [email protected] (W. El Ansari).</p
Multifocal interferometric synthetic aperture microscopy
No full textWe extend interferometric synthetic aperture microscopy (ISAM) to optical coherence tomography (OCT) data collected with multiple positions of the focal plane. Multifocal ISAM achieves spatially invariant resolution like ISAM by applying the solution of the inverse problem to the forward model for each channel. A general regularized solution eliminates artifacts that affect multibeam OCT while achieving better signal-to-noise ratio over the entire image than is possible with single-focus ISAM. We present detailed theory, computer simulation, experimental results and analysis.Item withdrawn by Mark Zulauf ([email protected]) on 2014-04-28T19:59:45Z
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Qatl Al-Rahmah
No full textThis paper was submitted to the symposium held by the Islamic Organization for Medical Sciences (IOMS) during the period 24-25 November 1988 in Cairo on the ethical dimensions of health policy from an Islamic perspective. The author argues that suffering and pain, from an Islamic ethical perspective, do not justify the practice of euthanasia. On the other hand, withholding futile treatment which is permissible in Islam should not be equated with the forbidden euthanasia
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