1,964 research outputs found
A.J. Potter (1918-1980): The career and creative achievement of an Irish composer in social and cultural context
No full textA. J. Potter (1918-1980) was one of the most significant composers working in Ireland in the latter part of the twentieth century. This thesis surveys his career and creative achievement, which have not hitherto been subjected to detailed scrutiny. The opening chapter presents a biographical overview: its first part outlines the circumstances of Potter's childhood and early adulthood, including his studies with Vaughan Williams at the Royal College of Music in London, his period of service in the British Army during World War II and his subsequent three-year sojourn in Africa; the second continues the narrative from 1951, when he settled permanently in Ireland, up to his death in 1980. In addition to detailing events of note in his private and professional life, an important subsidiary focus of this section is to depict the impoverished and culturally marginalised nature of Irish musical life at this period and describe the frustrations that these conditions engendered for the composer and his contemporaries. The remaining chapters are devoted to an examination of Potter's major works. Chapter 2 considers four student compositions that were written or conceived in the late 1930s and were subsequently revised when he resumed composing in 1949 after a creative silence of over a decade. Chapter 3 is divided in two parts: the first delineates the salient features of his mature creative aesthetic, while the second provides an account of his later orchestral works. The remaining chapters explore his choral music and stage works, which, in addition to the scores previously described, constitute his most noteworthy achievements
[[alternative]]The Copper(II) Complexes of Glycine and L-Alanine
No full text[[abstract]]本研究合成兩系列二價銅錯合物,(1)[Cu(A)(L)](ClO4), A為甘胺酸(
gly)及丙胺酸(L-ala), L為乙二胺(en), 1,10-二氮雜菲(phen), 2,2'-聯
啶(bipy)及2,9-二甲基-1,10-二氮雜菲(neoc);(2)[Cu(pa)(L)](ClO4),pa
為 啶甲基丙胺酸(N-picolyl-(L)-alanine), L為N-甲基咪 (NMIm),
4-甲基咪 (4MIm), 4-甲基 啶(4Mpy)及 啶(py). 利用元素分析, 紅外
光光譜, 紫外光-可見光吸收光譜, 電子順磁共振光譜, CD光譜及x-光結
構解析等方法, 完成錯合物結構的鑑定及鍵結性質的研究.
Copper(II) complexes of two types, Cu(A)(LL)(ClO4) and Cu(
pa)(L)(ClO4), where A = glycine(gly) and L-alanine(L-ala); pa =
N-picolyl-(L)-alanine; LL = 1,10-phenanthroline(phen),
2,2'-bipyridine(bipy), neocuproine(neoc) and ethylenediamine(
en); L = N-methylimidazole(NMIm), 4-methylimidazole(4MImH),
4-methylpyridine(4Mpy) and pyridine(py), have been synthesized
andcharacterized by elemental analyses, IR, UV-VIS, CD and EPR
spectroscopicmeasurements.
Copper(II) complexes of two types, Cu(A)(LL)(ClO4) and Cu(
Mode-II fracture behaviour of aerospace-grade carbon fibre/epoxy composites interleaved with thermoplastic veils
No full textThermoplastic veils based on Polyethylene-terephthalate (PET), Polyphenylene-sulfide (PPS) and Polyamide-12 (PA) fibres (∼10μm in diameter) were used to interlay unidirectional (UD), non-crimp fabric (NCF) and 5-Harness satin weave (5H) carbon fibre laminates. The PET and PPS veils remained in a fibrous form and the PA veils melted during the laminate curing process. The results of an end-loaded split test demonstrated significant improvements in the mode-II fracture performance in all cases. In general, interlaying thermoplastic veils was most efficient for toughening the UD laminates, with reduced improvements observed for the 5H and NCF laminates, respectively. The main toughening mechanism of the intact PET and PPS veils was thermoplastic fibre bridging. The melted PA veils mainly improved the fracture toughness of the epoxy at the mid-plane. The different toughening mechanisms of the veils, combined with different fracture mechanisms between the UD, NCF and 5H laminates, resulted in significantly different toughening levels
Processing, characteristics and properties of CNT-enhanced PA 66.
No full textIn this research, structure-properties-processing relationships of melt-processed CNT-PA 66 composites are investigated. Using a novel high-shear mixing device, efficient dispersal of CNTs in molten PA 66 is achieved, forming a well-bonded composite that displays enhanced mechanical properties. Post-fabrication heat treatment of some graphite-polymer composites also changes properties in new and unexpected ways. Observations by SEM and TEM indicate good bonding between CNTs and PA 66. DSC measurements show a second crystallization peak in the cooling curve, as the CNT content in PA 66 matrix increases from 1 to 5 wt. %. This new type of crystallization becomes a dominant feature in the range of 6-8 wt. % CNTs. Such interactions correlate with changes in elastic modulus and impact strength. FTIR analysis shows a steady increase in peak intensities for 1-5 wt. % CNT-PA 66 composites, until at 6 wt. % there is a sudden decrease in Amide I and II stretching peak intensities, accompanied by a shift to lower wave numbers. This behavior may be attributed to transformation of the original matrix structure to a new C-C rich bonded crystalline state. Three-point bend tests show a decrease in elastic modulus up to 3 wt. % CNTs in PA 66 due to minor degradation of the polymer matrix. At higher CNT concentrations, covalent bonding between fractured-ends of CNTs and polymer matrix occurs, which increases elastic modulus via a load transfer mechanism. At even higher CNT concentrations, a bridging effect occurs between adjacent covalently-bonded regions that increases impact strength. Eventually this results in a fully cross-linked structure of high stiffness and low impact resistance. As might be expected, peak stress at fracture shows an inverse relationship with stiffness. A two-step heat treatment is used to modify the structure and properties of 35 wt. % graphite-PEEK composite. It involves heating the composite at 200°C for 20 hours and then at 380°C for 18 hours. Examination of samples by TEM and XPS showed some polymer has gasified and the remaining polymer is a well-crystallized PEEK. 35 wt. % graphite-PA 66 composite was heat treated at 280°C for 24 and 48 hours. A new highly crystalline phase led to increase in elastic modulus was investigated by DSC and FTIR. This opens new opportunities to enhance properties and performance of injection-molded components or parts.Ph.D.Includes bibliographical referencesby Nofel Zuhier Whie
The Poetic World of Tsong kha pa : A Study of the Rten ’brel bstod pa (4)
No full textThis article includes an annotated Japanese translation of Tsong kha pa’s Rten ’brel bstod pa (vv. 31-58) together with Phur lcog ngag dbang byams pa’s commentary thereon. Tsong kha pa’s Rten ’brel bstod pa was composed around 1398 when the author attained the realization of the ultimate reality, which consists in the unity of dependent origination and emptiness. The work is a hymn to the Buddha Śākyamuni，the teacher who taught the doctrine of dependent origination. Tsong kha pa expresses praise to the Buddha and his teachings throughout the entire work. He alongside presents a brief description of the doctrine especially in the first half of the work (vv. 1-30). One can find poetic elements especially in the latter half of the work (vv. 31-58), which is dealt here. One of the most noticeable elements is the depiction of the moonlight. In verses 42-43, Tsong kha pa laments that he had no chance to hear the teaching from the Buddha himself, saying that his mind is not freed from the power of this sorrow. In verses 44-45, Tsong kha pa visualizes the Buddha discoursing in a melodious voice and receives blessings that tempers the heat of his sorrow. Tsong kha pa compares these blessings to the moonlight that soothes the torment of heat. Then, in verses 49-51, Tsong kha pa explains how his mind arrived at rest when he acquired a deeper understanding of Nāgārjuna’s Madhyamaka thought with the help of Candrakīrti’s commentary. Tsong kha pa compares Nāgārjuna’s thought to the garden of kumuda flowers, Candrakīrti (zla ba grags pa) to the moon (zla ba), and his commentary to the moonlight that makes the flowers bloom at night. It is clear that Tsong kha pa carefully uses the term zla ba to convey the double meaning, namely, Candra[-kīrti] and the moon. The figure of speech used here is a “punned metaphor" (Skt. śliṣṭarūpaka, Tib. sbyar ba’i gzugs can), which is defined in Daṇḍin’s Kāvyādarśa II 87, and which is commonly used by poets of India an Tibet. Thus we notice that Tsong kha pa’s Rten ’brel bstod pa, which is intended as a summary of the Madhyamaka idea of dependent origination, is fully characterized by poetic elements. It is probably for this reason that the work has been accepted at later periods as a masterpiece of Tibetan classical literature.広島大学比較論理学プロジェクト研究センター研究成果報告書（2014年度
On the mix-mode fracture of carbon fibre/epoxy composites interleaved with various thermoplastic veils
No full textThis work studied the mix mode-I/II fracture behaviour of an aerospace-grade carbon fibre/epoxy composite that was interlayer-toughened by Polyamide-12 (PA), Polyphenylene-sulphide (PPS), Polyimide (PI), Polyethersulfone (PES) and Polyethylenimine (PEI) fibres. During the laminate curing process, the PA fibres melted, the PPS and PI fibres kept in their original form and the PES and PEI fibres dissolved in the epoxy matrix. This resulted in different toughening mechanisms of the veils for the mix mode-I/II fracture of the laminates, which was studied using a cracked lap-shear test. The main toughening mechanisms were observed to be plastic deformation and failure of the thermoplastic resin for the meltable PA veils, thermoplastic fibre debonding and bridging for the intact PPS and PI veils, and thermoplastic particle debonding and plastic void growth for the dissolvable PES and PEI veils. The experimental results revealed that the fibre debonding and bridging mechanism was superior for toughness enhancement, followed by the thermoplastic particle debonding and plastic void growth mechanism. For instance, interleaving the PPS and PEI veils increased the mix-mode fracture propagation energy of the laminates by 345% and 171%, respectively. However, the toughening performance of the PA and PI veils was poor, since the crack mainly propagated at the vicinity around the interlayer/laminate interface.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.Structural Integrity & Composite
Mismatch-based delayed thrombolysis: a meta-analysis
No full text<p><b>Background and Purpose</b>: Clinical benefit from thrombolysis is reduced as stroke onset to treatment time increases. The use of "mismatch" imaging to identify patients for delayed treatment has face validity and has been used in case series and clinical trials. We undertook a meta-analysis of relevant trials to examine whether present evidence supports delayed thrombolysis among patients selected according to mismatch criteria.</p>
<p><b>Methods</b>: We collated outcome data for patients who were enrolled after 3 hours of stroke onset in thrombolysis trials and had mismatch on pretreatment imaging. We selected the trials on the basis of a systematic search of the Web of Knowledge. We compared favorable outcome, reperfusion and/or recanalization, mortality, and symptomatic intracerebral hemorrhage between the thrombolyzed and nonthrombolyzed groups of patients and the probability of a favorable outcome among patients with successful reperfusion and clinical findings for 3 to 6 versus 6 to 9 hours from poststroke onset. Results are expressed as adjusted odds ratios (a-ORs) with 95% CIs. Heterogeneity was explored by test statistics for clinical heterogeneity, I2 (inconsistency), and L’Abbé plot.</p>
<p><b>Results</b>: We identified articles describing the DIAS, DIAS II, DEDAS, DEFUSE, and EPITHET trials, giving a total of 502 mismatch patients thrombolyzed beyond 3 hours. The combined a-ORs for favorable outcomes were greater for patients who had successful reperfusion (a-OR=5.2; 95% CI, 3 to 9; I2=0%). Favorable clinical outcome was not significantly improved by thrombolysis (a-OR=1.3; 95% CI, 0.8 to 2.0; I2=20.9%). Odds for reperfusion/recanalization were increased among patients who received thrombolytic therapy (a-OR=3.0; 95% CI, 1.6 to 5.8; I2=25.7%). The combined data showed a significant increase in mortality after thrombolysis (a-OR=2.4; 95% CI, 1.2 to 4.9; I2=0%), but this was not confirmed when we excluded data from desmoteplase doses that were abandoned in clinical development (a-OR=1.6; 95% CI, 0.7 to 3.7; I2=0%). Symptomatic intracerebral hemorrhage was significantly increased after thrombolysis (a-OR=6.5; 95% CI, 1.2 to 35.4; I2=0%) but not significant after exclusion of abandoned doses of desmoteplase (a-OR=5.4; 95% CI, 0.9 to 31.8; I2=0%).</p>
<p><b>Conclusions</b>: Delayed thrombolysis amongst patients selected according to mismatch imaging is associated with increased reperfusion/recanalization. Recanalization/reperfusion is associated with improved outcomes. However, delayed thrombolysis in mismatch patients was not confirmed to improve clinical outcome, although a useful clinical benefit remains possible. Thrombolysis carries a significant risk of symptomatic intracerebral hemorrhage and possibly increased mortality. Criteria to diagnose mismatch are still evolving. Validation of the mismatch selection paradigm is required with a phase III trial. Pending these results, delayed treatment, even according to mismatch selection, cannot be recommended as part of routine care.</p>
Free radical scavenging activity of type II collagen peptides and chondroitin sulfate oligosaccharides from by-products of mottled skate processing
No full textThe by-products of the skate processing industry have bioactive properties but are mostly discarded. In the present study, the properties of skate cartilage, a major by-product of skate processing that is rich in chondroitin sulfate (CS) and type II collagen were investigated. Enzymatically-hydrolyzed type II collagen peptides (CP) and thermally hydrolyzed CS oligosaccharides (CSo) from skate cartilage were prepared and their antioxidant activities were studied. High free radical scavenging activity was observed in the <3 kDa MW fraction of the papain hydrolyzed CP (Pa-CP). CSo also had high free radical scavenging activity, but the activity was mainly due to the intermediate and final products of the non-enzymatic browning reaction resulting from high-temperature hydrolysis. These products may have included flavonoid-like compounds. Furthermore, Pa-CP and CSo were not cytotoxic. Thus, Pa-CP and CSo derived from skate by-products may be beneficial antioxidant ingredients. The present study may contribute to the development of functional health foods and achieving zero-waste skate processing
No Room for the "Paradise"? About Old Persian pa-ra-da-ya-da-a-ma
No full textThe Author discusses, with detailed philological considerations, the problematic Old Persian word for "Paradise", which is attested in a late inscription probably belonging to the time of Artaxerxes II from Susa
Aristophanes and Euripides: A Palimpsestuous Relationship
No full textAristophanes allows Euripides to interrupt constantly. In Athenian comedy of the fifth century they are on stage together, both literally and figuratively. Despite Aristophanes’ comedies having a meaning of their own, Euripides’ lines are so clearly visible underneath them that they can only be described as the verbal equivalent of a palimpsest. The Oxford English Dictionary defines a palimpsest as a manuscript or piece of writing on which later writing has superimposed or effaced earlier writing, or something reused or altered but still bearing visible traces of its earlier form. It is clear that a palimpsest is the product of layering that results in something as new, whilst still bearing traces of the original. Dillon describes the palimpsest as “...an involuted phenomenon where otherwise unrelated texts are involved and entangled, intricately interwoven, interrupting and inhabiting each other”. Aristophanes takes texts, particularly those of Euripides, which may otherwise have been unrelated, and weaves them together to form something new.
I will show that in a number of cases Aristophanes offers scenes that have already been performed in Euripides’ plays but lays his own plot over the tragedian’s, whilst at the same time drawing the audiences’ attention to the original. The nature of this borrowing overwrites Kristeva’s theory of ‘intertextuality’ and provides a new and more apposite name for the permutation of texts in which the geno-text corresponds to infinite possibilities of palimpsestuous textuality (and the pheno-text to a singular text, which contains echoes of what it could have been). The plurality of Euripides’ texts, whilst engendering those of Aristophanes, constantly interrupts them. Through the consideration of ancient and modern literary theory and by a close analysis of Aristophanes’ and Euripides’ plays, this thesis sets out to offer a new reading of the relationship between these two poets. It shows that they were engaged in a dialogue of reciprocal influence that came to a head at the end of the Peloponnesian War
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