Browsing University of Hertfordshire by Title

Now showing items 13211-13230 of 24188

    • Low-intake dehydration prevalence in non-hospitalised older adults: systematic review and meta-analysis 

      Parkinson, Ellice; Hooper, Lee; Fynn, Judith; Wilsher, Stephanie Howard; Oladosu, Titilopemi; Poland, Fiona; Roberts, Simone; Van Hout, Elien; Bunn, Diane (2023-08-31)
      Background & aims Low-intake dehydration amongst older people, caused by insufficient fluid intake, is associated with mortality, multiple long-term health conditions and hospitalisation. The prevalence of low-intake ...

    • Low-lying dipole response in the relativistic quasiparticle time blocking approximation and its influence on neutron capture cross sections 

      Litvinova, E.; Loens, H. P.; Langanke, K.; Martinez-Pinedo, G.; Rauscher, T.; Ring, P.; Thielemann, Friedrich-Karl; Tselyaev, V. (2009-05-15)
      We have computed dipole strength distributions for nickel and tin isotopes within the Relativistic Quasiparticle Time Blocking Approximation (RQTBA). These calculations provide a good description of data, including the ...

    • Low-mass bursty galaxies in JADES efficiently produce ionizing photons and could represent the main drivers of reionization 

      Simmonds, C.; Tacchella, S.; Hainline, K.; Johnson, B. D.; McClymont, W.; Robertson, B.; Saxena, Aayush; Sun, Fengwu; Witten, C.; Baker, William M.; Bhatawdekar, R.; Boyett, K.; Bunker, A. J.; Charlot, S.; Curtis-Lake, E.; Egami, E.; Eisenstein, D. J.; Hausen, R.; Maiolino, R.; Maseda, M. V.; Scholtz, J.; Williams, C. C.; Willot, C.; Witstok, J. (2024-01-01)
      We use deep imaging from the JWST Advanced Deep Extragalactic Survey (JADES) to study the evolution of the ionizing photon production efficiency, ζion. We estimate ζion for a sample of 677 galaxies at z ∼4-9 using NIRCam ...

    • Low-mass eclipsing binaries in the WFCAM Transit Survey : The persistence of the M-dwarf radius inflation problem 

      Cruz, Patricia; Diaz, Marcos; Birkby, Jayne; Barrado, David; Sipöcz, Brigitta; Hodgkin, Simon (2018-06-01)
      We present the characterization of five new short-period low-mass eclipsing binaries (LMEBs) from the WFCAM Transit Survey. The analysis was performed by using the photometric WFCAM J-mag data and additional low- and ...

    • A low-mass neutron flux monitor for the n_TOF facility at CERN 

      Mastinu, P. F.; Abbondanno, U.; Aerts, G.; Alvarez, H.; Andriamonje, S.; Angelopoulos, A.; Assimakopoulos, P.; Bacri, C. O.; Badurek, G.; Baumann, P.; Becvar, F.; Beer, H.; Benlliure, J.; Berthier, B.; Berthomieux, E.; Boffi, S.; Borcea, C.; Boscolo-Marchi, E.; Bustreo, N.; Calvino, P.; Cano-Ott, D.; Capote, R.; Carlson, P.; Cennini, P.; Chepel, V.; Chiaveri, E.; Coceva, C.; Colonna, N.; Cortes, G.; Cortina, D.; Couture, A.; Cox, J.; Dababneh, S.; Dahlfors, M.; David, S.; Dolfini, R.; Domingo-Pardo, C.; Duran, R.B.; Eleftheriadis, C.; Embid-Segura, M.; Ferrant, L.; Ferrari, A.; Ferreira-Lourenco, L.; Ferreira-Marques, R.; Frais-Koelbl, H.; Furman, W.I.; Giomataris, Y.; Goncalves, I. F.; Gonzalez-Romero, E.; Rauscher, T.; nTOF Collaboration (2004-09)
      A small-mass system has been developed for monitoring the flux of neutrons with energy up to 1 MeV at the new time-of-flight facility at CERN, n_TOF. The monitor is based on a thin Mylar foil with a Li-6 deposit, placed ...

    • Low-mass Objects in Moving Groups 

      Galvez-Ortiz, M. C.; Clarke, J. R. A.; Pinfield, D.J.; Folkes, S. L.; Jenkins, J. S.; Perez, A. E. Garcia; Burningham, B.; Day-Jones, A. C.; Jones, H.R.A. (Astronomical Society of the Pacific, 2010)
      We present here the kinematic study of part of a 132 target sample of low-mass objects, previously selected by photometric and astrometric criteria as possible members to five young moving groups (MGs): Local Association ...

    • A low-mass planet candidate orbiting Proxima Centauri at a distance of 1.5 AU 

      Damasso, M.; Del Sordo, Fabio; Anglada Escude, Guillem; Giacobbe, P.; Sozzetti, Alessandro; Morbidelli, L.; Pojmański, G.; Barbato, Domenico; Butler, R. P.; Jones, Hugh; Hambsch, Franz-Josef; Jenkins, James S.; Lopez-Gonzalez, Maria J.; Morales, Nicolas; Peña Rojas, Pablo A.; Rodriguez-Lopez, Cristina; Rodriguez, Eloy; Amado, Pedro J.; Anglada, Guillem; Feng, F.; Gómez, Jose F. (2020-01-15)
      Our nearest neighbor, Proxima Centauri, hosts a temperate terrestrial planet. We detected in radial velocities evidence of a possible second planet with minimum mass m c sin i c = 5.8 ± 1.9 M ⊕ and orbital period P c = ...

    • Low-Mass X-ray Binaries and Globular Clusters in Centaurus A 

      Jordan, A.; Sivakoff, G.R.; McLaughlin, D.E.; Blakeslee, J.P.; Evans, D.A.; Kraft, R.P.; Hardcastle, M.J.; Peng, E.W.; Cote, P.; Croston, J.H.; Juett, A.M.; Minniti, D.; Raychaudhury, S.; Sarazin, C.L.; Worrall, S.M.; Harris, W.E.; Woodley, K.A.; Birkinshaw, M.; Brassington, Nicola; Forman, W.R.; Jones, C.; Murray, S.S. (2007)
      We present results of Hubble Space Telescope and Chandra X-Ray Observatory observations of globular clusters (GCs) and low-mass X-ray binaries (LMXBs) in the central regions of Centaurus A. Out of 440 GC candidates, we ...

    • Low-mass X-ray binaries and globular clusters streamers and ARCS in NGC 4278 

      D'Abrusco, R.; Fabbiano, G.; Brassington, Nicola (2014-03-01)
      We report significant inhomogeneities in the projected two-dimensional spatial distributions of low-mass X-ray binaries (LMXBs) and globular clusters (GCs) of the intermediate mass elliptical galaxy NGC 4278. In the inner ...

    • Low-metallicity inhibition of type Ia supernovae and galactic and cosmic chemical evolution 

      Kobayashi, Chiaki; Tsujimoto, T; Nomoto, K; Hachisu, I; Kato, M (1998-08-20)
      We introduce a metallicity dependence of the Type Ia supernova (SN Ia) rate into the Galactic and cosmic chemical evolution models. In our SN Ia progenitor scenario, the accreting white dwarf (WD) blows a strong wind to ...

    • Low-Power Neuromorphic Hardware for Signal Processing Applications : A review of architectural and system-level design approaches 

      Rajendran, Bipin; Sebastian, Abu; Schmuker, Michael; Srinivasa, Nayaran; Eleftheriou, Evangelos (2019-11-01)
      Machine learning has emerged as the dominant tool for implementing complex cognitive tasks that require supervised, unsupervised, and reinforcement learning. While the resulting machines have demonstrated in some cases ...

    • Low-power, high-linearity transconductor with a high tolerance for process and temperature variations 

      Zhao, Jing; Sun, Yichuang; Nie, Guigen; Simpson, Oluyomi; Xu, Weilin (2020-11-18)
      A novel scheme for tunable complementary metal–oxide–semiconductor (CMOS) transconductor robust against process and temperature (PT) variations is presented. The proposed configuration is a voltage controlled circuit based ...

    • Low-pressure gas chromatography ion trap mass spectrometry for the fast determination of polycyclic aromatic hydrocarbons in air samples 

      Ravindra, K.; Godoi, A.F.L.; Bencs, L.; Van Grieken, R. (2006)

    • Low-pressure gas chromatography: Recent trends and developments 

      Ravindra, K.; Dirtu, A.C.; Covaci, A. (2008)

    • A Low-Profile Beam-Steering Reflectarray with Integrated Leaky-Wave Feed and 2-Bit Phase Resolution for Ka-band SatCom 

      Zhang, Qiaoshan; Zhang, Mingtao; Shi, Xiaowei; Gao, Steven; Luo, Qi; Chen, Lei; Wan, Jixiang; Wang, Xudong (2021-09-15)
      A novel reflect array (RA) with ultra-low-profile and 2-bit phase quantization beam-steering ability is presented in this paper. To reduce the profile, a Leaky-wave feed is used to excite the RA with enhanced illumination ...

    • Low-Profile Wideband Circularly Polarized Array Antennas Using Integrated Half-Power Quadrature Power Divider 

      Wen, Lehu; Gao, Steven; Luo, Qi; Hu, Wei; Sanz-Izquierdo, Benito; Yang, Xue-Xia (2022-04-11)
      Low-profile wideband circularly polarized (CP) array antennas using integrated half-power quadrature power divider (HP-QPD) are presented. A novel HP-QPD is first proposed as an important design concept for CP radiation. ...

    • Low-resolution near-infrared spectroscopic signatures of unresolved ultracool companions to M dwarfs 

      Cook, Neil; Pinfield, D. J.; Marocco, F.; Burningham, B.; Jones, H. R. A.; Frith, J.; Zhong, J.; Luo, A. L.; Qi, Z. X.; Cowan, N. B.; Gromadzki, M.; Kurtev, R.G.; Guo, Y. X.; Wang, Y. F.; Song, Y. H.; Yi, Z. P.; Smart, R. L. (2017-06-01)
      We develop a method to identify the spectroscopic signature of unresolved L-dwarf ultracool companions, which compares the spectra of candidates and their associated control stars using spectral ratio differences and ...

    • Low-resolution VLT spectroscopy of GRBs 991216, 011211 and 021211 

      Vreeswijk, P.M.; Smette, A.; Fruchter, S.; Palazzi, E.; Rol, E.; Wijers, R.A.M.J.; Kouveliotou, C.; Kaper, L.; Pian, E.; Masetti, N.; Frontera, F.; Hjorth, J.; Gorosabel, J.; Piro, L.; Fynbo, J.; Jakobsson, P.; Watson, D.; O'Brien, P.T.; Ledoux, C. (2006)

    • Low-Speed Aerodynamic Analysis Using Four Different Turbulent Models of Solver of a Wind Turbine Shroud 

      Ngouani Siewe, Micky; CHEN, Yong Kang; Day, Rodney; David-West, Opukuro (Springer Nature, 2021-04-30)
      This study presents the effect of four different turbulent models of solver on the aerodynamic analysis of a shroud at wind speed below 6 m/s. The converting shroud uses a combination of a cylindrical case and an inverted ...

    • Low-velocity impact behaviour of woven laminate plates with fire retardant resin 

      Grasso, Marzio; xu, yigeng; Ramji, Amit; Zhou, Gang; Chrysanthou, Andreas; Haritos, George; Chen, Yong Kang (2019-08-15)
      The understanding of the damage mechanisms for woven laminate plates under low-velocity impact is challenging as the damage mechanisms at the interface of adjacent layers are dominated by the fibre architecture. This work ...