123,093 research outputs found
WhatIF: R Software for Evaluating Counterfactuals
No full textWhatIf is an R package that implements the methods for evaluating counterfactuals introduced in King and Zeng (2006a) and King and Zeng (2006b). It offers easy-to-use techniques for assessing a counterfactual's model dependence without having to conduct sensitivity testing over specified classes of models. These same methods can be used to approximate the common support of the treatment and control groups in causal inference.
CENP-G in neocentromeres and inactive centromeres
No full textCENP-G is a novel constitutive centromere-specific protein localized to the kinetochore inner plate and subjacent region. It has been identified as associating specifically with the α-1 subfamily of α-satellite DNA. In the present work, the localization of CENP-G was compared with that of other CENPs by immunofluorescence and fluorescence in situ hybridization. Studies were carried out on four abnormal human centromeres:
two neocentromeres and two inactive centromeres.
CENP-G was detected in one of the two inactive centromeres but not in the other that shows a partial deletion of the alphoid DNA. Interestingly, CENP-G is also present in neocentromeres, which lack alphoid DNA sequences, and in the human Y chromosome, which lacks the α-1 type of satellite DNA. These data provide further evidence that CENP-G may be an essential factor in cen-
tromeric function and that in centromeres lacking the α-1 subfamily of alphoid DNA, other DNA sequences are able to bind CENP-G
Optimal beaconing control for epidemic routing in delay tolerant networks
No full textOwing to the uncertainty of transmission opportunities between mobile nodes, the routing in delay-tolerant networks (DTNs) exploits the mechanism of opportunistic forwarding. Energy-efficient algorithms and policies for DTN are crucial to maximizing the message delivery probability while reducing the delivery cost. In this contribution, we investigate the problem of energy-efficient optimal beaconing control in a DTN. We model the message dissemination under variable beaconing rate with a continuous-time Markov model. Based on this model, we then formulate the optimization problem of the optimal beaconing control for epidemic routing and obtain the optimal threshold policy from the solution of this optimization problem. Furthermore, through extensive numerical results, we demonstrate that the proposed optimal threshold policy significantly outperforms the static policy with constant beaconing rate in terms of system energy consumption savings
Inter-Greedy Technique for Fusion of Different Segmentation Strategies Leading to High-Performance Carotid IMT Measurement in Ultrasound Images
No full textRemoving spurious interactions in complex networks
No full textIdentifying and removing spurious links in complex networks is meaningful for many real applications and is crucial for improving the reliability of network data, which, in turn, can lead to a better understanding of the highly interconnected nature of various social, biological, and communication systems. In this paper, we study the features of different simple spurious link elimination methods, revealing that they may lead to the distortion of networks’ structural and dynamical properties. Accordingly, we propose a hybrid method that combines similarity-based index and edge-betweenness centrality. We show that our method can effectively eliminate the spurious interactions while leaving the network connected and preserving the network's functionalities
FIGURE 3. Phyllagathis chongzuoensis Zhe Zhang, S.W. Yao & S.Jin Zeng. A in Phyllagathis chongzuoensis (Melastomataceae), a new species from Guangxi, China
No full textFIGURE 3. Phyllagathis chongzuoensis Zhe Zhang, S.W. Yao & S.Jin Zeng. A: habitat; B: habit; C: abaxial surface of leaf blades; D: stoloniferous stem with some roots; E: one opening flower; F: one dissected flower, showing stamens (1), petals (2) and hypanthium with style (3); G: hypanthium, longitudinal section with two stamens (left) and transverse section (right); H: capsule, side view (left) and top view (right); I: one inflorescence with flower buds; J: seeds.Published as part of Zhang, Zhe, Tu, Xiong-De, Yao, Shi-Wei, Ma, Liang & Zeng, Si-Jin, 2021, Phyllagathis chongzuoensis (Melastomataceae), a new species from Guangxi, China, pp. 191-200 in Phytotaxa 527 (3) on page 198, DOI: 10.11646/phytotaxa.527.3.3, http://zenodo.org/record/575138
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
Density fluctuations induced by MARFE on FTU
No full textHigh density operations on FTU (Frascati Tokamak Upgade) are affected by strong density oscillations due to the so-called MARFE (Multifaceted Asymmetric Radiation From the Edge). An analysis of these oscillations is reported here. The MARFE on FTU occurs at the value of p = 0.48 (p is ratio between line-averaged density with averaged current density in the plasma); at the MARFE onset, the volume averaged density versus central density is almost constant, corresponding to the value of 0.8. The MARFE is observed to move up and down along the poloidal circumference on FTU. The MARFE movement causes continuous density fluctuations. Amplitude of density fluctuations decreases with edge safety factor and with electron density. The mechanism to cause MARFE movement is discussed. If amplitude exceeds a certain threshold, it may cause poloidal heat flux asymmetry between the edges of the MARFE, which will make the MARFE moving along the poloidal circumference. © 2013 Elsevier B.V. All rights reserved
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