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  • 1
    Electronic Resource
    Electronic Resource
    Raman-scattering assessment of Si+-implantation damage in InP (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3927-3929 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We studied the lattice damage caused by Si+ implantation into semi-insulating InP, with doses in the range of 1012 to 5×1014 cm−2, and the subsequent lattice recovery achieved by rapid thermal annealing (RTA), by means of Raman spectroscopy. With increasing implantation dose, an intensity reduction of the first- and second-order Raman peaks characteristic of crystalline InP is observed, together with the enhancement of disorder-activated modes. In samples implanted with doses higher than 1014 cm−2 the Raman spectra resembles that of amorphous InP, and the samples can be considered as fully amorphized. By RTA at 875 °C for 10 s, sample crystallinity is recovered, even in the case of those samples implanted with the highest dose. After annealing, the Raman spectra show no evidence of disorder-activated modes, and the intensity of the characteristic second-order peaks approaches the value found in unimplanted InP. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361819
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  • 2
    Electronic Resource
    Electronic Resource
    Use of Kramers–Kronig transforms for the treatment of admittance spectroscopy data of p-n junctions containing traps (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 7830-7836 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The use of Kramers–Kronig transforms is proposed for the treatment of admittance spectroscopy data of junctions when significant shunt conductance or series resistance is present. An algorithm has been implemented to calculate the transformations numerically and the validity of the method developed has been tested using simulated data. Two experimental systems, p-n junctions into InP made by ion implantation, and atomic-layer-epitaxy-grown CdS/CdTe heterojunctions, have been characterized using this procedure. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362391
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of carbon nitride thin films prepared by dual ion beam sputtering (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 764-766 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Carbon nitride thin films obtained by dual ion beam sputtering have been investigated by electron energy-loss spectroscopy (EELS), transmission electron microscopy, and Fourier transform infrared spectroscopy. The nitrogen content in the films depends on deposition conditions. A maximum value of N/C=0.8 has been achieved. A new peak at 286.7 eV energy loss in the C K-edge EELS spectra has been assigned to C=N bonds with C in the sp2 hybridization state. In addition, experimental evidences are presented of the formation of β-C3N4 crystallites embedded in a layer of a polymer like CNx amorphous phase. An evaluation of the experimental parameters that lead to the highest N content in the films is also included. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117884
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  • 4
    Electronic Resource
    Electronic Resource
    Clinicopathological and immunohistochemical analysis of 20 cases of Merkel cell carcinoma in search of prognostic markers (2005)
    Oxford, UK : Blackwell Science Ltd
    Histopathology 46 (2005), S. 0 
    Details
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Aims:  To evaluate the clinicopathological and immunohistochemical characteristics of Merkel cell carcinoma (MCC) in an attempt to find new, potentially significant, prognostic markers.Methods and results:  Clinical data and follow-up, histopathological features (pattern, cell size, thickness, mitoses, vascular invasion, lymphocytic infiltration) and immunohistochemical detection [CK20, thyroid transcription factor (TTF-1), chromogranin A, synaptophysin, p53, Ki67, Fli-1, CD99, c-Kit] were evaluated in 20 cases of MCC. Fli-1 and CD99 were detected in 90% and 55% of cases, respectively. Tumour size 〉 30 mm, stage II, ‘absent’ lymphocytic infiltration, and the presence of 〉 50% of Ki67+ tumour cells, were found to be prognostic indicators of disease-free interval (DFI), but only ‘absent’ lymphocytic infiltration constituted an independent prognostic factor of DFI after multivariate analysis. For overall survival, the same variables, together with local recurrence and lymph node involvement, had prognostic significance, with only local recurrence as an independent prognostic factor after multivariate analysis.Conclusions:  Absence of lymphocytic infiltration and Ki67 immunoreactivity in more than 50% of tumour cells should be evaluated in conjunction with other well-known prognostic markers in MCC. Furthermore, recognizing that Fli-1 and CD99 expression is commonly found in MCC by immunohistochemistry may avoid misinterpretation in the differential diagnosis of MCC with other small round cell tumours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2559.2005.02158.x
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamics of directional selectivity in MT receptive field centre and surround (2005)
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 22 (2005), S. 0 
    Details
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We studied receptive field organization of motion-sensitive neurons in macaque middle temporal cortical area (MT), by mapping direction selectivity in space and in time. Stimuli consisted of pseudorandom sequences of single motion steps presented simultaneously at many different receptive field locations. Spatio-temporal receptive field profiles were constructed by cross-correlating stimuli and spikes. The resulting spike-triggered averages revealed centre-surround organization. The temporal dynamics of the receptive fields were generally biphasic with increased probability for the preferred direction at short latency (50–70 ms) and decreased probability at longer latency (80–100 ms). The response latency of the receptive field surround was on average 16 ms longer than that of the centre. Our results show that surround input and biphasic behaviour reflect two different mechanisms, which make MT cells specifically sensitive to motion contrast in space and time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-9568.2005.04363.x
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  • 6
    Electronic Resource
    Electronic Resource
    Valerius Flaccus—Poet of Romance (1938)
    Cambridge : Cambridge University Press
    Greece and Rome 7 (1938), S. 137-148 
    Details
    ISSN: 0017-3835
    Source: Cambridge Journals Digital Archives
    Topics: Archaeology , Classical Studies
    Notes: The period of the Flavian emperors (A.D. 69–96) was distinguished by a notable revival of epic poetry. No fewer than three poets, whose work is extant, flourished contemporaneously—Statius, Valerius, and Silius. It was indeed an age of literary figures, including Martial, Pliny the Younger, Quin-tilian, and Tacitus. Statius and Valerius are interesting as epic poets in that they broke away from the tradition of national and patriotic poetry prescribed for their art from the time of Ennius. Silius, on the other hand, remained true to the convention of Latin epic, and, in an age when the stimulus of national pride was losing its effect on poetry, produced a long poem that lacked originality and inspiration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0017383500005568
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  • 7
    Electronic Resource
    Electronic Resource
    Persius—Poet of the Stoics (1939)
    Cambridge : Cambridge University Press
    Greece and Rome 8 (1939), S. 172-182 
    Details
    ISSN: 0017-3835
    Source: Cambridge Journals Digital Archives
    Topics: Archaeology , Classical Studies
    Notes: There can be little doubt that the extant remains of Persius form the whole of his writings. In his boyhood he had indulged in the literary exercises of the classroom, and these immature efforts included a tragedy, a book of travels, and some lines on the elder Arria, whose Non dolet1 was an appropriate subject for a young Stoic to commemorate. These experiments had little merit, otherwise they would not have been destroyed on the advice of Cornutus, his friend and teacher and literary executor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0017383500006380
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  • 8
    Electronic Resource
    Electronic Resource
    Changes of copper location in CuY zeolites induced by preparation methods (1996)
    Springer
    Catalysis letters 41 (1996), S. 55-61 
    Details
    ISSN: 1572-879X
    Keywords: TPR ; FT-IR ; XPS ; copper location ; Y zeolite ; ionic exchange ; impregnation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The location of transition ions in copper- and copper-zinc-loaded Y type zeolites prepared by different procedures has been studied by temperature-programmed reduction, infrared spectroscopy of CO adsorbed on pretreated samples and X-ray photoelectron spectroscopy. Samples outgassed at 673 K showed Cu+ species due likely to reduction of Cu2+ ions under vacuum. Over exchanged CuY zeolites copper species in exchange sites were detected, while an impregnated sample exhibited bands of CO adsorbed on both Cu2+ and Cu+ ions developed at the surface of CuO crystals, and small proportions of Cu+ ions located in accessible exchange sites SII and SnII. Similar findings were observed in Zn- and Cu-exchanged zeolites although the relative proportion of Cu in SI positions was decreased due to competition between Cu2+ and Zn2+ ions. Samples reduced in hydrogen at 523 K showed the appearance of Cu0 species in impregnated samples, whereas Cu+ dominated in the exchanged counterparts. Reduction at 598 K led to substantial changes in Cu-exchanged samples in water. The proportion of Cu+ species decreased by reduction to Cu0 and simultaneously migration to Cu+ to SII sites occurred. While Cu2+ or Cu+ were found on outgassed samples, only Cu0 and intrazeolite Cu+ were observed after H2-reduction at 623 K. Changes in copper exposure as a function of sample pretreatments were also revealed by X-ray photoelectron spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811713
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  • 9
    Electronic Resource
    Electronic Resource
    Organochlorine Residue Levels and Bioconcentration Factors in Otters (Lutra lutra L.) from Northeast Spain (1996)
    Springer
    Bulletin of environmental contamination and toxicology 57 (1996), S. 532 -535 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001289900222
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  • 10
    Electronic Resource
    Electronic Resource
    Record of climatic change in neritic carbonates: turnover in biogenic associations and depositional modes (Late Miocene, southern Spain) (1996)
    Springer
    International journal of earth sciences 85 (1996), S. 327-337 
    Details
    ISSN: 1437-3262
    Keywords: Miocene ; Palaeoceanography ; Climatic changes ; Sea-level fluctuations ; Chlorozoan reefs ; Bryomol ramps
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract In order to evaluate the geological record of climatic change in neritic carbonates, we studied Late Miocene rock outcrops in southern Spain. Six episodes of reef growth are documented (Burdigalian to Messinian) in Neogene basins of the Betic Cordillera, which were located close to the margin of the global reef belt. The reefs are characterized by various zooxanthellate corals which decrease in diversity with time, andHalimeda; the youngest reefs of the latest Messinian are characterized by the dominance of the genusPorites. Late Miocene coral reefs and reef-rimmed platforms alternate over time with non-reefal carbonate ramps characterized by skeletal calcirudites or with gypsum such as that formed during the Messinian salinity crisis. The calcirudites lack reef corals, calcified green algae and extensive marine cement, but exhibit skeletal components described from both modern and fossil nontropical carbonates. These include bryozoans, mollusks, foraminifers, echinoderms and minor balanids, as well as coralline algae of a bryomol association. The presence of some larger foraminifers indicates high temperatures, close to the lower temperature threshold of the reef assemblage. Sea level lowstands and highstands are documented by wedges of bryomol carbonate and chlorozoan patch reefs or prograding platforms. Thus, temperate climate depositional modes correspond to relatively low sea levels, and warm-water modes to high sea levels. The Neogene infill of the Agua Amarga and Sorbas basins documents two of these cycles. Other climate/sea-level cycles (including Messinian gypsum in the cool water depositional mode) are well established in adjacent Neogene basins in southern Spain. This type of composite sequence seems to occur only along the margin of the global reef belt and indicates an oscillatory latitudinal movement of the margin, which is associated with global climatic change. The analysis of turnover in neritic depositional carbonate systems may therefore be considered a sensitive tool for reconstructing climatic change from the fossil record. However, warm-water modes and temperate-water modes of carbonate sedimentation and diagenesis differ significantly. For this reason the interpretation of composite system sequences by sequence stratigraphy requires an extended concept. The particular type of mixed bryomolchlorozoan depositional sequence also bears some potential for drowning, because sea level rise may be faster than the net production rate of temperate carbonate systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02422238
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