1,057 research outputs found
M. Vukovic, Obvezno pravo
No full textM. Vukovic, Obvezno pravo. In: Revue internationale de droit comparé. Vol. 9 N°4, Octobre-décembre 1957. pp. 830-831
Optical properties of long photonic crystal fibre tapers
No full textIn this thesis I investigate optical properties of metre - long tapers. Microstructured optical fibre technology has created new opportunities in a broad range of science and technology. In the work presented in this thesis I have combined the microstructured optical fibre technology with a novel tapering facility in order to develop new applications in the field of nonlinear optics. This thesis concerns development of a novel tapering facility, capable of achieving intermediate length (few tens of cm to ~10 m) tapers. In comparison with systems presented to date, the novel system has the advantage of the increased control over the desired taper profile and enables efficient fabrication of intermediate taper lengths of potentially arbitrary profiles. During the fabrication the fibre diameter exhibits significant variations, due to various disturbances. A design of the feedback loop for the enhanced control of the output diameter variation is proposed. The system capabilities have been tested and demonstrated in many different examples. The presented results show that the variation of the fibre diameter is within ~1%, which offers possibilities to use the system in various applications. As an example of the intermediate taper length design and application, parabolic pulse generation was investigated. It represents a very attractive pulse shape, since it can propagate at high peak powers while avoiding wave-breaking effect and have a flat and broad spectrum, which could lead to pulse compression applications. This thesis presents numerical modelling and experimental results (restricted to a set of parameters of fibres available from ’stock’) concerning this phenomena. Supercontinuum generation is an area of research that has been attracting scientific interest over several decades. This thesis shows results of a study of supercontinuum generation in intermediate length tapered microstructured optical fibres. A simulation tool has been developed and the procedure to efficiently determine optimum conditions for improving flatness of the supercontinuum spectra has been proposed. The proposed method concerns a ’standard’ microstructured optical fibre, but generally can be extended to different fibre designs
Novel applications of fibre tapers
No full textIn this talk we will discuss new applications for fibre tapers ranging from femtosecond pulse manipulation to optical clock generation in micro-coil resonators. Fundamental to these interactions is the enhanced nonlinearity arising from the smaller cores making compact optical devices possible
Kerr nonlinear switching in silicon fibre-based microcylindrical resonators
No full textWe investigate the Kerr nonlinearity in a a-Si:H microcylindrical resonator fabricated from the silicon fibre platform. The large resonant wavelength shift observed for pulsed excitation is used to demonstrate ultrafast all-optical switching
La peine de mort en Yugoslavie socialiste et le conflit des sources normatives
No full textThe author analyses a discussion on death penalty that took place in Belgrade, at the end of the socialist era, between Igor Primorac and Ivan Jankovic. Primorac attacked the utilitarian justification of the socialist penal system, though he agreed on different, retributive grounds that death penalty for premeditated murder should be preserved. Jankovic advocated utilitarian ideas and rejected the death penalty as an atavistic aberration. In the first part of the article, their main arguments are presented and their contextual meaning is being explained. In the second part of the article, the author analyses those arguments and concludes that a) retributivism has not been the philosophy of death penalty during its history, b) that retentionist conclusions do not follow from retributive premises, c) that utilitarianism, in spite of its historical connection with abolitionism, can justify death penalty, d) that since the problem cannot be resolved on moral grounds alone, it should be resolved on political grounds, and e) that political considerations require the abolition of death penalty
Hollow core large mode area fibre employing a subwavelength grating reflector
No full textHollow core large mode area fibres are ideal candidates to guide light at high powers while avoiding non-linear effects and, as such, they are generating much scientific interest. A variety of fibres have been investigated, including tube lattice photonic bandgap fibres and Kagomé-latticed photonic crystal fibres. One of the major challenges in obtaining low loss hollow core fibres is related to the unavoidable perturbations induced by the coupling between the core and cladding modes which is responsible for the increase of leakage loss. Recent approach based on the insertion of additional antiresonant elements demonstrates the significance of fibre geometrical parameters and shows leakage loss of an order of ~10-4 dB/m. In this paper, we present preliminary results of a novel approach to fibres that guide light in a large hollow core, starting from the high index contrast grating reflector platform. Subwavelength gratings have been used to achieve broadband mirrors with reflectivity greater than 99%. Importantly, the physical dimensions of the grating must be smaller than the wavelength of incident light, which implies that the diffraction order of interest is 0th. Under a surface normal incidence on diffraction grating, evanescent orders in the direction parallel to the grating period overlap with the leaky mode of the grating leading to the effect of guided mode resonance and a destructive interference effect between the two grating modes, which results in high reflection
Characterization of thermal induced nonlinear effects in silicon microcylindrical resonators
No full textWe explore the thermal nonlinearity in hydrogenated amorphous silicon microcylindrical resonators that are fabricated from the silicon optical fiber platform. In particular, we use a pump/probe technique to experimentally determine the thermal response time from which we can infer the material absorption coefficient
Unfinished Dip. Ed. M-Z: MCCARTHY - MYINT, NALLY - NOONAN, O'BRIEN - OZIRMAK, PAAS - PUMMEROY, QUILLIAM, RADCLIFFE - RYAN, SAFRAN - SZAFRANKO, TACON - TYSON, UNKLES, VADIVELOO - VUKOVIC, WAHR - WU, YEO - ZWALF
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/442597272036
Item: [2018.0034.00003] "Unfinished Dip. Ed. M-Z: MCCARTHY - MYINT, NALLY - NOONAN, O'BRIEN - OZIRMAK, PAAS - PUMMEROY, QUILLIAM, RADCLIFFE - RYAN, SAFRAN - SZAFRANKO, TACON - TYSON, UNKLES, VADIVELOO - VUKOVIC, WAHR - WU, YEO - ZWALF
Preimplantation genetic testing for carriers of BRCA1/2 pathogenic variants
No full textThe detection of germline BRCA1/2 pathogenic variant has relevant implications for the patients and their family members. Family planning, prophylactic surgery and the possibility of preimplantation genetic testing for monogenic disorders (PGT-M) to avoid transmittance of pathogenic variants to the offspring are relevant topics in this setting. PGT-M is valuable option for BRCA carriers, but it remains a controversial and underdiscussed topic. Although the advances in PGT technologies have improved pregnancy rate, there are still several important challenges associated with its use. The purpose of this review is to report the current evidence on PGT-M for BRCA1/2 carriers, ethical concerns and controversy associated with its use, reproductive implications of BRCA pathogenic variants, underlying areas in which an educational effort would be beneficial as well as possibilities for future research efforts in the field
Whispering gallery modes in semiconductor optical fibres and optical bottle microresonators
No full textWe explore the optical properties of whispering gallery modes (WGMs) in silicon optical fibres and optical bottle microresonators. In particular, a pump-probe technique is used to experimentally demonstrate thermally induced all-optical modulation. High quality (Q) factors and small mode volumes are utilized to demonstrate ultrafast Kerr effect based modulation and switching. Q factors exceeding ~107 are demonstrated for novel microbottle resonators (MBRs), fabricated from standard telecommunications fibres
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