The second-harmonic spectrum of the output of an optical parametric emitter at degeneracy exhibits a narrow peak, much sharper than the spectrum of the parametric light. This peak is a manifestation ...of the second-order correlations in parametric light. Alternatively, it can be considered as resulting from the recombination of simultaneously generated (twin) wave packets. The twin-wave-packet correlation time is shown to be limited by the first order coherence time of parametric light. (Author)
Bimodal Hand Vein Recognition System using Support Vector Machine Magadia, Abram Philip I D.; Zamora, Rufter Fits Gerald L.; Linsangan, Noel B. ...
2020 IEEE 12th International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment, and Management (HNICEM),
2020-Dec.-3
Conference Proceeding
There are many types of biometric identifiers such as fingerprint, retina, or iris that can be used to recognize individuals. The hand veins are within the body which makes it difficult to forge and ...the vein pattern is unique for different individuals. Since there is a lack of study that considers both palm and dorsal vein on hands for recognition, further research on this area might be needed. This study was conducted to discover new ways to implement bimodal hand vein recognition. The system takes advantage of two NoIR cameras connected to a multi-camera adapter which was mounted on Raspberry Pi Model 3B+ in acquiring images of dorsal and palm vein exposed to infrared light. The quality of the acquired images was improved using the proposed image pre-processing techniques. Feature points were successfully obtained using the ORB algorithm. The results obtained showed that using Support Vector Machine as a classifier for hand veins was good and generated an accuracy of 97.16%.
Lasers of diffraction-limited volumes involve the interaction of small numbers of particles (photons and dipoles). We demonstrate that these small populations of discrete particles induce large ...intensity noise in the output of the laser.
We report on the fabrication of a nonguiding half-wave semiconductor microcavity containing two quantum wells, and present time resolved photoluminescence measurements under resonant and non-resonant ...excitation with a variable detuning between the cavity and the quantum well exciton. When tuning the cavity length, the emission spectra present the characteristic polariton-like dispersion branches with a 4.6 meV splitting at the anti-crossing. On the exciton-like part of each branch, the emission dynamics is similar to the emission of a bare quantum well. However on the photon-like part, the radiative lifetime is considerably shortened. We describe these features by a polariton type model: mixed exciton-photon states arise from the strong radiative coupling between the two oscillators and present a radiative decay time which reflects the respective proportion of exciton and photon in their wavefunction.
This 3rd volume of 'Gas Engineering' introduces the concept of liquefied natural gas and the concept gas-to-liquids and also presents a review of the uses of gas streams and the effects of the ...various gases on the environment. This volume also describes the properties gas streams as they are related to corrosion effects are also presented. The relationship of the properties of gas streams as they affect corrosion such as carburization and metal dusting as well as corrosion in steel and other materials used in refinery technology are also presented and the book summarizes key findings into corrosion processes in gas-processing equipment as well as corrosion in offshore structures. Each book contains references at the end of chapter which include information from the open literature and meeting proceedings to give a picture of where the gas processing technology stands as well as indicate some relatively new technologies that could become important in the future. Also, each book also contains a comprehensive glossary. The books are written in an easy-to-read style and offer a ready-at-hand (one-stop-shopping) guide to the many issues that are related to the engineering aspects of the properties and processing of natural gas as well as the effects of natural gas on various ecosystems as well as to pollutant mitigation and clean-up. The books present an overview, with a considerable degree of detail of the various aspects of natural gas technology. Any chemistry presented in the books is used as a means of explanation of a particular point but is maintained at an elementary level.
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