Bucurescu D, Podolyak Z, Rusu C, de Angelis G, Axiotis M, Gadea A, Farnea E, Ionescu-Bujor M, Iordachescu A, Kroll T, Martinez T, Bizzetti PG, Broda R, Medina NH, Quintana B, Rubio B, Ivascu M, Zhang YH, Cata-Danil G, Cata-Danil I, Marginean N, Marginean R, Mihailescu LC, Suliman GA, Regan PH, Gelletly W, Ur CA, Langdown SD, Dobon JJV, Bazzacco D, Lunardi S (2005)High-spin states in the nuclei Y-91 and Nb-95, In: PHYSICAL REVIEW C71(3)ARTN 0pp. ?-?
AMERICAN PHYSICAL SOC
Regan PH, Jones GA, Podolyak Z, de Angelis G, Zhang YH, Gadea A, Ur CA, Abdullah M, Axiotis M, Bazzacco D, Broda R, Ionescu-Bujor M, Bucurescu D, Farnea E, Gelletly W, Iordachescu A, Kroell T, Langdown SD, Lenzi S, Lunardi S, Marginean N, Napoli DR, Martinez T, Medina N, Menegazzo R, Quintana B, Rubio B, Rusu C, Schwenger R, Tonev D, Valiente-Dobon JJ, von Oertzen W, Wollel G (2006)Nuclear structure and reaction mechanism studies with multinucleon reactions, In: Corradi L, Fioretto E, Gadea A, Ackermann D, Haas F, Pollarolo G, Scarlassara F, Szilner S, Trotta M, (eds.), FUSION06: Reaction Mechanisms and Nuclear Structure at the Coulomb Barrier853pp. 271-276 Beghini S, Della Vedova F, Duchene G, Farnea E, Faul T, Fioretto E, Gadea A, Gelletly W, Guiot B, Ionescu-Bujor M, Iordachescu A, Mason P, Landown SD, Lenzi SM, Lunardi S, Mihai C, Marginean R, Menegazzo R, Montagnoli G, Napoli D, Stefanini AM, Podolyak Z, Regan PH, Scarlassara F, Suliman G, Szilner S, Trotta M, Valiente-Dobon JJ, Zhang YH, Ur CA, Bucurescu D, Rusu C, Marginean N, de Angelis G, Corradi L, Bazzacco D (2007)gamma-ray spectroscopy of the neutron-rich nuclei (89)Rb, (92)Y, and (93)Y with multinucleon transfer reactions, In: PHYSICAL REVIEW C76(6)ARTN 0pp. ?-?
AMER PHYSICAL SOC
Tu XL, Kelic-Heil A, Litvinov Y, Podolyak Zsolt, Zhang YH, Huang WJ, Xu HS, Blaum K, Bosch F, Chen RJ, Walker Philip (2017)Application of Isochronous Mass Spectrometry for the study of angular momentum population in projectile fragmentation reactions, In: Physical Review C: Nuclear Physics95(1)014610
American Physical Society
Isochronous mass spectrometry was applied to measure isomeric yield ratios of fragmentation reaction prod- ucts. This approach is complementary to conventional g -ray spectroscopy in particular for measuring yield ratios for long-lived isomeric states. Isomeric yield ratios for the high-spin I = 19=2¯h states in the mirror nuclei 53Fe and 53Co are measured to study angular momentum population following the projectile fragmentation of 78Kr at energies of 480 A MeV on a beryllium target. The 19/2 state isomeric ratios of 53Fe produced from different projectiles in literature have also been extracted as a function of mass number difference between projectile and fragment (mass loss). The results are compared to ABRABLA07 model calculations. The isomeric ratios of 53Fe produced using different projectiles suggest that the theory underestimates not only the previously reported dependence on the spin but also the dependence on the mass loss.
Geissel H, Gernhaeuser R, Hagmann S, Izumikawa T, Hillenbrand P-M, Kozhuharov C, Kurcewicz J, Litvinov SA, Litvinov YA, Ma X, Muenzenberg G, Najafi MA, Nolden F, Ohtsubo T, Ozawa A, Ozturk FC, Patyk Z, Reed M, Reifarth R, Stoehlker T, Sanjari MS, Schneider D, Steck M, Sun B, Suzaki F, Suzuki T, Trageser C, Tu X, Uesaka T, Winckler N, Walker P, Wang M, Weick H, Woods P, Xu H, Yamaguchi T, Yan X, Zhang Y, Brandau C, Atanasov D, Blaum K, Bosch F, Buehler P, Chen X, Dillmann I, Faestermann T, Gao B (2015)Between atomic and nuclear physics: radioactive decays of highly-charged ions, In: JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS48(14)ARTN 1pp. ?-?
IOP PUBLISHING LTD
With the fast development of the Internet, the size of Forwarding Information Base (FIB) maintained at backbone routers is experiencing an exponential growth, making the storage support and lookup process of FIBs a severe challenge. One effective way to address the challenge is FIB compression, and various solutions have been proposed in the literature. The main shortcoming of FIB compression is the overhead of updating the compressed FIB when routing update messages arrive. Only when the update time of FIB compression algorithms is small bounded can the probability of packet loss incurred by FIB compression operations during update be completely avoided. However, no prior FIB compression algorithm can achieve small bounded worst case update time, and hence a mature solution with complete avoidance of packet loss is still yet to be identified. To address this issue, we propose the Unite and Split (US) compression algorithm to enable fast update with controlled worst case update time. Further, we use the US algorithm to improve the performance of a number of classic software and hardware lookup algorithms. Simulation results show that the average update speed of the US algorithm is a little faster than that of the binary trie without any compression, while prior compression algorithms inevitably seriously degrade the update performance. After applying the US algorithm, the evaluated lookup algorithms exhibit significantly smaller on-chip memory consumption with little additional update overhead
Zhang Ye, Liu Mingzhen, Eperon Giles E., Leijtens Tomas C., McMeekin David, Saliba Michael, Zhang Wei, de Bastiani Michele, Petrozza Annamaria, Herz Laura M., Johnston Michael B., Lin Hong, Snaith Henry J. (2015)Charge selective contacts, mobile ions and anomalous hysteresis in organic–inorganic perovskite solar cells, In: Materials Horizons2(3)pp. 315-322
Royal Society of Chemistry
High-efficiency perovskite solar cells typically employ an organic–inorganic metal halide perovskite material as light absorber and charge transporter, sandwiched between a p-type electron-blocking organic hole-transporting layer and an n-type hole-blocking electron collection titania compact layer. Some device configurations also include a thin mesoporous layer of TiO2 or Al2O3 which is infiltrated and capped with the perovskite absorber. Herein, we demonstrate that it is possible to fabricate planar and mesoporous perovskite solar cells devoid of an electron selective hole-blocking titania compact layer, which momentarily exhibit power conversion efficiencies (PCEs) of over 13%. This performance is however not sustained and is related to the previously observed anomalous hysteresis in perovskite solar cells. The “compact layer-free” meso-superstructured perovskite devices yield a stabilised PCE of only 2.7% while the compact layer-free planar heterojunction devices display no measurable steady state power output when devoid of an electron selective contact. In contrast, devices including the titania compact layer exhibit stabilised efficiency close to that derived from the current voltage measurements. We propose that under forward bias the perovskite diode becomes polarised, providing a beneficial field, allowing accumulation of positive and negative space charge near the contacts, which enables more efficient charge extraction. This provides the required built-in potential and selective charge extraction at each contact to temporarily enable efficient operation of the perovskite solar cells even in the absence of charge selective n- and p-type contact layers. The polarisation of the material is consistent with long range migration and accumulation of ionic species within the perovskite to the regions near the contacts. When the external field is reduced under working conditions, the ions can slowly diffuse away from the contacts redistributing throughout the film, reducing the field asymmetry and the effectiveness of the operation of the solar cells. We note that in light of recent publications showing high efficiency in devices devoid of charge selective contacts, this work reaffirms the absolute necessity to measure and report the stabilised power output under load when characterizing perovskite solar cells.
Wang J-B, Johnson SR, Zhang Y-H, Bueckers C, Blume G, Thraenhardt A, Schlichenmaier C, Klar PJ, Weiser G, Sweeney Stephen, Koch SW, Hader J, Moloney JV, Hosea Thomas (2007)Microscopic electroabsorption line shape analysis for Ga(AsSb)/GaAs heterostructures, In: JOURNAL OF APPLIED PHYSICS101(3)ARTN 0pp. ?-?
AMER INST PHYSICS
A series of Ga(AsSb)/GaAs/(AlGa) As samples with varying GaAs spacer width are studied by electric-field modulated absorption (EA) and reflectance spectroscopy and modeled using a microscopic theory. The analysis of the Franz-Keldysh oscillations of GaAs capping layer and of the quantum-confined Stark shift of the lowest quantum well (QW) transitions shows the strong inhomogeneity of the built-in electric field indicating that the field modulation due to an external bias voltage differs significantly for the various regions of the structures. The calculations demonstrate that the line shape of the EA spectra of these samples is extremely sensitive to the value of the small conduction band offset between GaAs and Ga(AsSb) as well as to the magnitude of the internal electric field changes caused by the external voltage modulation in the QW region. The EA spectra of the entire series of samples are modeled by the microscopic theory. The good agreement between experiment and theory allows us to extract the strength of the modulation of the built-in electric field in the QW region and to show that the band alignment between GaAs and Ga(AsSb) is of type II with a conduction band offset of approximately 40 meV.
Zhang Y, Chambers JA, Kendrick P, Cox TJ, Li FF (2006)Acoustic parameter extraction from occupied rooms utilizing blind source separation, In: Gabrys B, Howlett RJ, Jain LC (eds.), KNOWLEDGE-BASED INTELLIGENT INFORMATION AND ENGINEERING SYSTEMS, PT 3, PROCEEDINGS4253pp. 1208-1215
A novel multimodal solution is proposed to solve the problem of blind source separation (BSS) of moving sources. Since for moving sources the mixing filters are time varying, therefore, the unmixing filters should also be time varying and can be difficult to track in real time. In this solution the visual modality is utilized to facilitate the separation of moving sources. The movement of the sources is detected by a relatively simplistic 3-D tracker based on video cameras. The tracking process is based on particle filtering which provides robust tracking performance. Positions and velocities of the sources are obtained from the 3-D tracker and if the sources are moving, a beamforming algorithm is used to perform real time speech enhancement and provide separation of the sources. Experimental results show that by utilizing the visual modality, a good BSS performance for moving sources in a low reverberant environment can be achieved. © 2011, IGI Global.
As each type of satellite network has different link features, its data transmission must be designed based on its link features to improve the efficiency of data transferring. The transmission of navigation integrated services information (NISI) in a global navigation satellite system (GNSS) with inter-satellite links (ISLs) is studied by taking the real situation of inter-satellite communication links into account. An on-demand computing and buffering centralized route strategy is proposed based on dynamic grouping and the topology evolution law of the GNSS network within which the satellite nodes are operated in the manner of dynamic grouping. Dynamic grouping is based on satellites spatial relationships and the group role of the satellite node changes by turns due to its spatial relationships. The route strategy provides significant advantages of high efficiency, low complexity, and flexible configuration, by which the established GNSS can possess the features and capabilities of feasible deployment, efficient transmission, convenient management, structural invulnerability and flexible expansion.
Blume G, Hild K, Marko IP, Hosea TJC, Yu S-Q, Chaparro SA, Samal N, Johnson SR, Zhang Y-H, Sweeney SJ (2012)Cavity mode gain alignment in GaAsSb-based near-infrared vertical cavity lasers studied by spectroscopy and device measurements, In: JOURNAL OF APPLIED PHYSICS112(3)ARTN 0pp. ?-?
AMER INST PHYSICS
Su R, Shivanna R, Trindade G, Watts John, Xu Z, Liu T, Chen K, Ye F, Wu P, Zhao L, Wu J, Tu Y, Zhang Y, Yang X, Zhang Wei, Zhu R, Friend R, Gong Q, Snaith H, Sadhanala A, Luo D, Yang W, Wang Z, Hu Q (2018)Enhanced photovoltage for inverted planar heterojunction perovskite solar cells, In: Science360(6396)pp. 1442-1446
American Association for the Advancement of Science
The highest power conversion efficiencies (PCEs) reported for perovskite solar cells (PSCs) with inverted planar structures are still inferior to those of PSCs with regular structures, mainly because of lower open-circuit voltages (Voc). Here we report a strategy to reduce nonradiative recombination for the inverted devices, based on a simple solution-processed secondary growth technique. This approach produces a wider bandgap top layer and a more n-type perovskite film, which mitigates nonradiative recombination, leading to an increase in Voc by up to 100 millivolts. We achieved a high Voc of 1.21 volts without sacrificing photocurrent, corresponding to a voltage deficit of 0.41 volts at a bandgap of 1.62 electron volts. This improvement led to a stabilized power output approaching 21% at the maximum power point.
Hild K, Sweeney SJ, Wright S, Lock DA, Jin SR, Marko IP, Johnson SR, Chaparro SA, Yu S-Q, Zhang Y-H (2006)Carrier recombination in 1.3 mu m GaAsSb/GaAs quantum well lasers, In: APPLIED PHYSICS LETTERS89(17)ARTN 1pp. ?-?
AMER INST PHYSICS
In spite of the almost ideal variation of the radiative current of 1.3 mu m GaAsSb/GaAs-based lasers, the threshold current, J(th), is high due to non-radiative recombination accounting for 90% J(th) near room temperature. This also gives rise to low T-0 values similar to 60K close to room temperature, similar to that for InGaAsP/InP.
Li L, Zhang Y, Chambers JA, Sayed AH (2008)Steady-State Performance of Incremental Learning over Distributed Networks for Non-Gaussian Data, In: Yuan BZ, Ruan QQ, Tang XF, (eds.), ICSP: 2008 9TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING, VOLS 1-5, PROCEEDINGSpp. 227-230