1,721,806 research outputs found
A Mendelian randomization study confirmed a causal relationship between high basal metabolic rate levels and increased risk of lung cancer
No full textGWA
Optical fibre nanowire devices
No full textThe Optical Fibre Nanowire (OFN) is a potential building block in future micro- and nano-photonic device since it offers a number of unique optical and mechanical properties. In this thesis, the background and fundamental features of nanowires are introduced; the theory, design and demonstration of novel nanowire devices are discussed.At first, a short adiabatic taper tip is manufactured, and it is used as optical tweezers for trapping 1µm microspheres.Then, the most important devices - the OFN resonators including the simple Optical Nanowire Loop Resonator (ONLR) and complicated 3D Optical Nanowire Microcoil Resonator (OMNR) - are investigated theoretically and experimentally. A one-turn loop resonator and two-, three-, and four-turn ONMR are demonstrated experimentally; several kinds of methods on optimizing the ONMR profile are presented to make the manufacture of high-Q ONMRs easier. In order to protect and stabilize the ONMR, embedding the device in Teflon is demonstrated.Finally, more applications in refractometric sensing are presented: schemes of sensors based on an embedded ONLR and ONMR are presented. The sensor sensitivities are calculated: 700 nm/RIU (RIU is the Refractive Index Unit) can be achieved at the wavelength of 970 nm for a diameter of 600 nm. Additionally, a refractometric sensor based on an embedded ONMR is demonstrated experimentally; its sensitivity is about 40 nm/RIU
Manufacture of 3D microfiber coil resonators
No full text3D microfiber coil resonators are experimentally demonstrated. Three-turn and four-turn microcoil resonators are fabricated by wrapping a microfiber on a low refractive index rod. The extinction ratio and free spectrum range are ~10dB and ~1nm respectively
Microfibre resonating optical sensors for microfluidics
No full textA considerable fraction of the fundamental mode can propagate outside the fibre physical boundary if the optical fibre has a micrometric or sub-micrometric diameter. In these conditions, high-Q resonators can be promptly achieved with simple coils. Devices based on coiled microfibres have a resonating wavelength strongly dependent on the surrounding media, hence they can be used as an extremely sensitive refractive index sensors. In free space, these devices suffer from reliability problems connected to stability and degradation; embedding in low refractive index polymers has solved this issue providing the stability requirements that a sensor needs. can be achieved for both resonating configurations. The use of a small size microfibers and/or thin layer of embedding material d improves considerably S in both CANMR and ENLR. CANMR has also a microfluidic channel which can be easily integrated in a more complex biosystem
Embedded optical microfiber coil resonator
No full textThe embedding of an optical microfiber coil resonator in Teflon is demonstrated. Resonances in excess of 9dB and Q-factors greater than 6000 have been observed. The device is compact, robust and portable
Preservation of micro-optical fibres by embedding
No full textAlthough micro-optical fibers have found many potential applications in devices and sensing, their optical and mechanical properties quickly degrade with time. In this paper a method to preserve micro-optical fibers by embedding from degradation is presented and studied. The power transmission of bare and Teflon-coated micro-optical fibers has been investigated along a long time. While in bare micro-optical fibers with 0.9 µm-diameter an unrecoverable loss of 0.2 dB/h has been observed, Teflon has been shown to provide a reliable protection against degradation
Embedding optical microfiber coil resonators in Teflon
No full textA method to manufacture optical microfiber coil resonators embedded in Teflon has been demonstrated for what is the first time to the best of our knowledge. The resonator was obtained by wrapping a microfiber on a low refractive index rod and coating it with a Teflon resin. The coating process is investigated and discussed. Resonances in excess of 9 dB, a free spectral range of ~0.8 nm, and Q factors greater than 6000 have been observed in the embedded resonator. The device is compact, robust, and portable
A contribution to the taxonomy of the genus Pentacentrus Saussure (Orthoptera: Gryllidae: Pentacentrinae)
No full textLi, Ruotong, Xu, Fei, Liu, Hao-Yu (2019): A contribution to the taxonomy of the genus Pentacentrus Saussure (Orthoptera: Gryllidae: Pentacentrinae). Zootaxa 4671 (3): 434-438, DOI: https://doi.org/10.11646/zootaxa.4671.3.
FIGURE 1 in A contribution to the taxonomy of the genus Pentacentrus Saussure (Orthoptera: Gryllidae: Pentacentrinae)
No full textFIGURE 1. Distribution map of Pentacentrus species in China.Published as part of Li, Ruotong, Xu, Fei & Liu, Hao-Yu, 2019, A contribution to the taxonomy of the genus Pentacentrus Saussure (Orthoptera: Gryllidae: Pentacentrinae), pp. 434-438 in Zootaxa 4671 (3) on page 435, DOI: 10.11646/zootaxa.4671.3.9, http://zenodo.org/record/344878
FIGURES 6–8 in A contribution to the taxonomy of the genus Pentacentrus Saussure (Orthoptera: Gryllidae: Pentacentrinae)
No full textFIGURES 6–8. Pentacentrus dulongjiangensis sp. nov. male: Genitalia (6. dorsal view; 7. ventral view; 8. lateral view).Published as part of Li, Ruotong, Xu, Fei & Liu, Hao-Yu, 2019, A contribution to the taxonomy of the genus Pentacentrus Saussure (Orthoptera: Gryllidae: Pentacentrinae), pp. 434-438 in Zootaxa 4671 (3) on page 437, DOI: 10.11646/zootaxa.4671.3.9, http://zenodo.org/record/344878
- …
