2,671 research outputs found
Anthropology as an interdisciplinary field
No full textThe article discusses anthropology as an interdisciplinary field from the author's own research experience.AnthropologySociologySSCI0ARTICLE120-243
Stratego/XT 0.17. A Language and Toolset for Program Transformation
No full textPreprint of paper published in: Science of Computer Programming (Elsevier), 72 (1-2), 2008; doi:10.1016/j.scico.2007.11.003 Stratego/XT is a language and toolset for program transformation. The Stratego language provides rewrite rules for expressing basic transformations, programmable rewriting strategies for controlling the application of rules, concrete syntax for expressing the patterns of rules in the syntax of the object language, and dynamic rewrite rules for expressing context-sensitive transformations, thus supporting the development of transformation components at a high level of abstraction. The XT toolset offers a collection of flexible, reusable transformation components, and tools for generating such components from declarative specifications. Complete program transformation systems are composed from these components. This paper gives an overview of Stratego/XT 0.17, including a description of the Stratego language and XT transformation tools; a discussion of the implementation techniques and software engineering process; and a description of applications built with Stratego/XT.Software Computer TechnologyElectrical Engineering, Mathematics and Computer Scienc
A Note on the Asymptotic Normality of Sample Autocorrelations for a Linear Stationary Sequence
No full textAbstractWe consider a stationary time series {Xt} given byXt=∑∞k=−∞ψkZt−k, where {Zt} is a strictly stationary martingale difference white noise. Under assumptions that the spectral densityf(λ) of {Xt} is squared integrable andmτ∑|k|⩾mψ2k→0 for someτ>1/2, the asymptotic normality of the sample autocorrelations is shown. For a stationary long memoryARIMA(p, d, q) sequence, the conditionmτ∑|k|⩾mψ2k→0 for someτ>1/2 is equivalent to the squared integrability off(λ). This result extends Theorem 4.2 of Cavazos-Cadena [5], which were derived under the conditionm∑|k|⩾mψ2k→0
XT-ADS sensitivity analysis
No full textThis work has been carried out in the first period (March-June 2010) In which the author Joined the Central Design Team in Mol (B) for the CDT/FASTEF EU FP7 project. Before to start with the deep characterisation foreseen during the WP2 for FASTEF (100 MW LBE cooled reactor, working in both critical and sub-critical modes), a preliminary code tuning has been carried out by adopting the XT-ADS core layout (developed in IP EUROTRANS, EU FP6 project). The tuning deals with the neutronic codes, in particular: ERANOS (deterministic) and MCNPX (Monte Carlo). The main results have been included in the two SCK-CEN calculation notes here reported. The first calculation note (ANS/RMS/TS/ARTD00CDT-02/827/10-15) highlights the main differences between the ERANOS and MCNPX models for XT-ADS. Then the ERANOS input has been modified to consider the same assumptions adopted by MCNPX. A further tuning of both models yields, as a whole, a reduction of the MCNPX-ERANOS keff difference (at BoL) from by about 2700 pcm down to 1000 pcm. The second calculation note (ANS/RMS/TS/ARTD00CDT-02/827/10-16) summarizes the XT-ADS sensitivity analysis performed by ERANOS ver. 2.1 with two different nuclear data Iibraries: JEFF3.1 and ENDF/BVI.8. The study, carried out by exploiting the basics of standard perturbation theory, points out which nuclides, which cross-section and which range of energy yield the most significant impact on the core reactivity. As in the first note, the ERANOS evaluations (performed in a reference and voided configurations) have been compared with the results obtained with the MCNFX code
Surface plasma waves with their harmonics generation from pre-structured targets
No full textSurface plasma waves with their harmonics are generated from pre-structured targets. The harmonics are generated by coherent synchrotron emission or relativistically oscillating mirror and then resonantly amplified by surface plasma wave excitation. Two dimensional particle-in-cell simulations and the theoretical analysis show that the laser is coupled to the structured target by generating a periodic current. Some of the generated harmonics have half integer wave numbers but integer frequencies. This interesting phenomenon is controlled by the structure period of the target. (C) 2016 AIP Publishing LLC.National Basic Research Program of China [2013CB834101]; National Natural Science Foundation of China [11175029, 11575035]SCI(E)[email protected]; [email protected]
Design of 125-μm cladding diameter multicore fibers with high core multiplexing factor for wideband optical transmission
No full text We propose improved design of heterogeneous trench-assisted multicore fibers (MCFs) for wideband space division multiplexing (SDM) optical transmission. By adopting different parameters for heterogeneous cores, the trade-off among the effective area (Aeff ), cut-off wavelength (λcc ), and crosstalk (XT) was balanced. Different optimization approaches for long-haul and short-reach transmission applications have been adopted. A 125-μm cladding diameter 6-core fiber with Aeff = 90 μm2 , λcc = 1300 nm and XT < −30 dB/100 km at 1550-nm wavelength was designed for long-haul transmission. The designed MCF has a relative core multiplexing factor (RCMF) of 6.75, which is the highest value among the reported uncoupled MCFs with compatible bandwidth. Another 125-μm cladding diameter 8-core fiber with an Aeff = 80 μm2 , λcc = 1300 nm, and XT < −40 dB/km at 1550-nm wavelength was designed for short-reach application and a RCMF of 8.00 was achieved. The XT in both fibers are bending-insensitive due to the small critical bending radius (Rpk ) of 7 cm for 6-core fiber with an Aeff = 90 μm2 and 5 cm for 8-core fiber with Aeff = 80 μm2 , respectively. The designed fibers are promising for high-density wideband SDM transmission. </p
Endothelial cell fitness dictates the source of regenerating liver vasculature
No full textNeoangiogenesis plays a key role in diverse pathophysiological conditions, including liver regeneration. Yet, the source of new endothelial cells (ECs) remains elusive. By analyzing the regeneration of the liver vasculature in irradiation-based myeloablative and nonmyeloablative bone marrow transplantation mouse models, we discovered that neoangiogenesis in livers with intact endothelium was solely mediated by proliferation of resident ECs. However, following irradiation-induced EC damage, bone marrow-derived mononuclear cells were recruited and incorporated into the vasculature. Further experiments with direct bone marrow infusion or granulocyte colony-stimulating factor (G-CSF)-mediated progenitor cell mobilization, which resembles clinically relevant stem cell therapy, demonstrated that bone marrow-derived cells did not contribute to the regeneration of liver vasculature after two-thirds partial hepatectomy (PHx). Taken together, the data reconcile many of the discrepancies in the literature and highlight that the cellular source of regenerating endothelium depends on the fitness of the residual vasculature
Optimized design of 125-μm 6-core fiber with large effective area for wideband optical transmission
No full text We propose an optimized design of heterogeneous trench-assisted 125-μm 6-core fiber with Aeff about 90 μm2, λcc about 1300 nm, and XT<-30 dB/100 km for wideband transmission. Relative core multiplicity factor of 6.75 was achieved. </p
Enhanced betatron radiation in strongly magnetized plasma
No full textBetatron radiation in strongly magnetized plasma is investigated by two dimensional (2D) particle-in-cell (PIC) simulations. The results show that the betatron radiation in magnetized plasmas is strongly enhanced and is more collimated compared to that in unmagnetized plasma. Single particle model analysis shows that the frequency and the amplitude of the electrons's betatron oscillation are strongly influenced by the axial external magnetic field and the axial self-generated magnetic field. And the 2D PIC simulation shows that the axial magnetic field is actually induced by the external magnetic field and tends to increase the betatron frequency. By disturbing the perturbation of the plasma density in the laser-produced channel, the hosing instability is also suppressed, which results in a better angular distribution and a better symmetry of the betatron radiation. Published by AIP Publishing.National Natural Science Foundation of China [11175029, 11575035, 11175030]; National Basic Research Program of China [2013CB834101]SCI(E)[email protected]; [email protected]
IBM/XT-based automatic monitoring instrumentation system for eating behavior studies in rats
No full textAn auto-feeding system based on the IBM-XT microcomputer has been designed for use in the anti-obesity research program in the Pharmacology Department at Hoffmann-La Roche Inc. By using this system, experimental rats can be automatically fed, some which have been given anti-obesity drugs and some which have not. The system can also collect data, such as eating times and food intake, which are used for studying the rat\u27s eating behavior.
The system is designed to control thirty six cages with one experimental rat in each cage and it performs three functions:
1 ) To automatically dispense a preset quantity of food, either when the food left in the food cup falls below a minimum value or at a set interval of time.
2 ) To collect ongoing data such as eating frequency, quantity of food in the cups and quantity of food delivered.
3 ) To perform basic data analysis to show the rat\u27s eating patterns and display the data using tables and bar graphs.
The system consists of three sections: an IBM/XT microcomputer, external devices and electronic interface. The external devices of the system are constructed with the specially designed cage assembles, motor driven feeders, photo sensor pairs, position switches and electronic balances. The system is supported by electronic circuits which interface to the IBM-XT microcomputer. The electronic interfaces were designed and built by the author. The system is also equipped with a software package written in Quick Basic (a compiler BASIC) for performing experiments, testing the system and analyzing the collected data
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