2,408 research outputs found
Modules program structures and the structuring of operating systems
In this paper some views are presented on the way in which complex systems, such as Operating Systems and the programs to be interfaced with them can be constructed, and how such systems may become heavily library oriented. Although such systems have a dynamic nature, all interfacing within and among modules can be checked statically. It will be shown that the concepts presented are equally valid for single user systems, multi-programming systems and even distributed systems. The ideas have been spurred by the implementation of a modular version of Pascal and a supporting Operating System, currently nearing completion at Twente University of Technology, The Netherlands
Exploring the SDSS Dataset with Linked Scatter Plots: I. EMP, CEMP, and CV Stars
We present the results of a search for extremely metal-poor (EMP),
carbon-enhanced metal-poor (CEMP), and cataclysmic variable (CV) stars using a
new exploration tool based on linked scatter plots (LSPs). Our approach is
especially designed to work with very large spectrum data sets such as the
SDSS, LAMOST, RAVE, and Gaia data sets, and it can be applied to stellar,
galaxy, and quasar spectra. As a demonstration, we conduct our search using the
SDSS DR10 data set. We first created a 3326-dimensional phase space containing
nearly 2 billion measures of the strengths of over 1600 spectral features in
569,738 SDSS stars. These measures capture essentially all the stellar atomic
and molecular species visible at the resolution of SDSS spectra. We show how
LSPs can be used to quickly isolate and examine interesting portions of this
phase space. To illustrate, we use LSPs coupled with cuts in selected portions
of phase space to extract EMP stars, CEMP stars, and CV stars. We present
identifications for 59 previously unrecognized candidate EMP stars and 11
previously unrecognized candidate CEMP stars. We also call attention to 2
candidate He~II emission CV stars found by the LSP approach that have not yet
been discussed in the literature.Comment: Accepted by the Astrophysical Journal Supplement (February 2017
Identification of the plasma membrane receptor for interleukin-1 on mouse thymoma cells
AbstractThe plasma membrane receptor for interleukin-1 (IL-1) has been characterized from mouse EL4-6.1 thymoma cells. Following binding of IL-1 to surface labeled EL4-6.1 cells, the IL-1 binding molecule was immunoprecipitated using a rabbit antiserum against the hormone. The putative IL-1 receptor is a membrane-associated glycopeptide of Mr = 82000 containing probably two or three N-linked glycan units as indicated by its conversion into a Mr = 60 000 polypeptide upon deglycosylation with endo-β-N-glycosidase F
The Simplicial Characterisation of TS networks: Theory and applications
We use the visibility algorithm to construct the time series networks
obtained from the time series of different dynamical regimes of the logistic
map. We define the simplicial characterisers of networks which can analyse the
simplicial structure at both the global and local levels. These characterisers
are used to analyse the TS networks obtained in different dynamical regimes of
the logisitic map. It is seen that the simplicial characterisers are able to
distinguish between distinct dynamical regimes. We also apply the simplicial
characterisers to time series networks constructed from fMRI data, where the
preliminary results indicate that the characterisers are able to differentiate
between distinct TS networks.Comment: 11 pages, 2 figures, 4 tables. Accepted for publication in
Proceedings of the 4th International Conference on Applications in Nonlinear
Dynamics (ICAND 2016
A pascal compiler for PDP 11 minicomputers
In this paper the development of a cross-compiler running on the central computing facility is described. The compiler transforms PASCAL source code into object code for the PDP 11 family. The arguments for higher level languages on minicomputers and the choice made for PASCAL are discussed. It is shown that only a minor effort in terms of manpower is required if such a development is based on an existing compiler that is suited to the purpose of adaptation. Even without large amounts of optimization the code produced is both compact and efficient. Some attention is paid to requirements that should be fulfilled in portable compilers. The paper ends with a discussion of some strong points and weak points of the PDP 11 architecture
Accuracy of computerized tomography in determining hepatic tumor size in patients receiving liver transplantation or resection
Computerized tomography (CT) of liver is used in oncologic practice for staging tumors, evaluating response to treatment, and screening patients for hepatic resection. Because of the impact of CT liver scan on major treatment decisions, it is important to assess its accuracy. Patients undergoing liver transplantation or resection provide a unique opportunity to test the accuracy of hepatic-imaging techniques by comparison of finding of preoperative CT scan with those at gross pathologic examination of resected specimens. Forty-one patients who had partial hepatic resection (34 patients) or liver transplantation (eight patients) for malignant (30 patients) or benign (11 patients) tumors were evaluable. Eight (47%) of 17 patients with primary malignant liver tumors, four (31%) of 13 patients with metastatic liver tumors, and two (20%) of 10 patients with benign liver tumors had tumor nodules in resected specimens that were not apparent on preoperative CT studies. These nodules varied in size from 0.1 to 1.6 cm. While 11 of 14 of these nodules were 1.0 cm. These results suggest that conventional CT alone may be insufficient to accurately determine the presence or absence of liver metastases, extent of liver involvement, or response of hepatic metastases to treatment
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