701 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
Particulate matter level determines the growth and cloud forming potential of nucleated particles
No full textThe case datasets of the new particle events including particle number size distribution (PNSD), non-refractory submicron aerosol species, CCN number concentrations (NCCN)) are shown here during two campaigns. One campaign in China was conducted from 28 August to 24 September 2015 in Beijing (BJ). The sampling site in urban Beijing (39.97°N, 116.37°E, ASL: 49 m) is situated in the Tower branch of Institute of Atmospheric Physics, Chinese Academy of Sciences. The other campaign was conducted in Xingtai (XT, 37.18oN, 114.36oE, ASL: 180 m), which is located at the national weather station in southern Heibei province. The experiment period was from 6 May to 28 May 2016. While the bulk CCN number concentration was measured by the DMT-CCNc. The aerosol PNSDs were spanned the size range of 15-600 nm and 15–685 nm at BJ and XT site, respectively. The non-refractory submicron aerosol species are including organics, sulfate (SO4), nitrate (NO3), ammonium (NH4), and chloride (ChL)
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
Support properties of super-Brownian motions with spatially dependent branching rate
No full textAbstractWe consider a critical finite measure-valued super-Brownian motion X=(Xt,Pμ) in Rd, whose log-Laplace equation is associated with the semilinear equation (∂/∂t)u=12Δu−ku2, where the coefficient k(x)>0 for the branching rate varies in space, and is continuous and bounded. Suppose that suppμ is compact. We say that X has the compact support property, if Pμ⋃0⩽s⩽tsuppXsisbounded=1 for every t>0, and we say that the global support of X is compact if Pμ⋃0⩽s<∞suppXsisbounded=1. We prove criteria for the compact support property and the compactness of the global support. If there exists a constant M>0 such that k(x)⩾exp(−M||x||2) as ||x||→∞ then X possesses the compact support property, whereas if there exist constant β>2 such that k(x)⩽exp(−||x||β) as ||x||→∞ then X does not have the compact support property. For the global support, we prove that if k(x)=||x||−β(0⩽β<∞) for sufficiently large ||x||, then the maximum decay order of k for the global support being compact is different for d=1, d=2 and d⩾3: it is O(||x||−3) in dimension one, O(||x||−2(log||x||)−3) in dimension two, and O(||x||−2) in dimensions three or above
Design of two-dimensional photonic crystal edge emitting laser for photonic integrated circuits
No full textAn edge emitting laser based on two-dimensional photonic crystal slabs is proposed. The device consists of a square lattice microcavity, which is composed of two structures with the same period but different radius of air-holes, and a waveguide. In the cavity, laser resonance in the inner structure benelits from not only the anomalous dispersion characteristic of the first band-edge at the M point in the first Brillouin-zone but also zero photon states in the outer structure. A line defect waveguide is introduced in the outer structure for extracting photons from the inner cavity. Three-dimensional finite-difference time-domain simulations apparently show the in-plane laser output from the waveguide. The microcavity has an effective mode volume of about 3.2(lambda/eta(slab))(3) for oscillation -mode and the quality factor of the device including line defect waveguide is estimated to be as high as 1300
A discussion on the application and production of metal ion beams
No full textMetal ion beams, which are used in surface modification of metals and alloys as ion beam micrometallurgy, are promising candidates for advanced applications in semiconductors and insulators. Doping with transition metal and rare-earth metal ions in semiconductors and insulators to form metallic nanoclusters attracted much more attention recently, since their applications in diluted magnetic semiconductors, electroluminescent devices, giant magnetic resistance, etc. In this paper, some experiments for metal ion beams will be presented, and various methods and technologies for the production of metal ion beams will be discussed. (C) 2008 American Institute of Physics.Instruments & InstrumentationPhysics, AppliedSCI(E)EICPCI-S(ISTP)PubMed
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
Continuity modulus of stochastic homeomorphism flows for SDEs with non-Lipschitz coefficients
No full textAbstractLet Xt(x) solve the following Itô-type SDE (denoted by EQ.(σ,b,x)) in RddXt=σ(Xt)⋅dWt+b(Xt)dt,X0=x∈Rd. Assume that for any N>0 and some CN>0|b(x)−b(y)|+‖∇σ(x)−∇σ(y)‖⩽CN|x−y|(log|x−y|−1∨1),|x|,|y|⩽N, where ∇ denotes the gradient, and the explosion times of EQ.(σ,b,x) and EQ.(σ,tr(∇σ⋅σ)−b,x) are infinite for each x∈Rd. Then we prove that for fixed t>0, x↦Xt−1(x) is α(t)-order locally Hölder continuous a.s., where α(t)∈(0,1) is exponentially decreasing to zero as the time goes to infinity. Moreover, for almost all ω, the inverse flow (t,x)↦Xt−1(x,ω) is bicontinuous
Role of Computed Tomography in Predicting Programmed Death Ligand-1 Positivity in Gastric Adenocarcinoma
No full textZhi-Hong Yu,1,* Wei-Qin Ma,2,* Ji-Wei Ren,3 Xu-Ting Zhang,3 Lin Chu3 1Department of Ultrasound, Shanxi Provincial People’s Hospital, The Fifth Hospital of Shanxi Medical University, The Fifth Clinical Medical College of Shanxi Medical University, Taiyuan, Shanxi, 030012, People’s Republic of China; 2Department of CT/MRI, Lvliang People’s Hospital, Shanxi Province, Lvliang, Shanxi, 033000, People’s Republic of China; 3Department of Radiology, Shanxi Province Cancer Hospital/Shanxi Hospital Affiliated to Cancer Hospital, Chinese Academy of Medical Sciences/Cancer Hospital Affiliated to Shanxi Medical University, Taiyuan, Shanxi, 030013, People’s Republic of China*These authors contributed equally to this workCorrespondence: Xu-Ting Zhang; Ji-Wei Ren, Department of Radiology, Shanxi Province Cancer Hospital/Shanxi Hospital Affiliated to Cancer Hospital, Chinese Academy of Medical Sciences/Cancer Hospital Affiliated to Shanxi Medical University, No. 3 Zhigongxin Street, Taiyuan, Shanxi, 030013, People’s Republic of China, Tel +86 18335172028, Email [email protected]; [email protected]: To examine the association between computed tomography (CT) imaging characteristics and programmed death ligand-1 (PD-L1) expression in patients with gastric adenocarcinoma (GAC), and to develop a nomogram model for prediction.Methods: The patients were randomly allocated into a training set and a validation set at a ratio of 7:3. The training set was further divided into a PD-L1 positive group and a PD-L1 negative group, based on the combined positive score (CPS). Univariate and multivariate logistic regression analyses were performed to identify independent predictors of PD-L1 positivity. A nomogram was developed to assess the model’s predictive performance, which was evaluated using the receiver operating characteristic (ROC) curve, calibration curve, and decision curve analysis (DCA). It was also compared with the model established by previous study.Results: Patients with PD-L1-positive gastric adenocarcinoma exhibited a higher prevalence of larger short diameters of lymph nodes (LNs) (≥ 1 cm), and lower CT attenuation values in the venous and delayed phases compared to those in the PD-L1-negative group. Short diameter of LNs, and CT attenuation values in the delayed phase were identified as independent predictors of PD-L1 positivity. The nomogram analysis indicated that CT attenuation values in the delayed phase were the most significant predictor of PD-L1 positivity, followed by short diameter of LNs.Conclusion: The GAC prediction model based on the CT imaging features is effective in predicting PD-L1 expression levels and demonstrates strong clinical applicability.Keywords: combined positive score, computed tomography, gastric adenocarcinoma, nomogram, programmed death ligand-
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