3,798 research outputs found
Holographic renormalization by Hamilton-Jacobi formulation with generated ansatz
In AdS/CFT corresponding, the UV divergence of generating functional on the
field theory can be removed as the IR divergence in the gravity. This geometric
process is well known as holographic renormalization. The standard method of
holographic renormalization is based on the Fefferman-Graham expansion, which
is strict and universal but technically cumbersome. To improve the technique,
different methods have been proposed. Here we develop an alternative approach
to holographic renormalization based on the Hamilton-Jacobi formulation of
gravity. Compared to previous approaches, its distinguishing feature is the
generation of exact ansatz of counterterms. We apply this approach to several
typical holographic models, which consistently performs well.Comment: 28 page
Incorporating Relation Knowledge into Commonsense Reading Comprehension with Multi-task Learning
This paper focuses on how to take advantage of external relational knowledge
to improve machine reading comprehension (MRC) with multi-task learning. Most
of the traditional methods in MRC assume that the knowledge used to get the
correct answer generally exists in the given documents. However, in real-world
task, part of knowledge may not be mentioned and machines should be equipped
with the ability to leverage external knowledge. In this paper, we integrate
relational knowledge into MRC model for commonsense reasoning. Specifically,
based on a pre-trained language model (LM). We design two auxiliary
relation-aware tasks to predict if there exists any commonsense relation and
what is the relation type between two words, in order to better model the
interactions between document and candidate answer option. We conduct
experiments on two multi-choice benchmark datasets: the SemEval-2018 Task 11
and the Cloze Story Test. The experimental results demonstrate the
effectiveness of the proposed method, which achieves superior performance
compared with the comparable baselines on both datasets.Comment: Accepted at CIKM'19, 4 page
(3-CarbÂoxy-5-sulfonatobenzoato-Îş2 O 1,O 1′)bisÂ[2-(2-pyridÂyl)-1H-benzimidazole-Îş2 N 2,N 3]zinc(II) monohydrate
In the title compound, [Zn(C8H4O7S)(C12H9N3)2]·H2O, the ZnII atom has a distorted octaÂhedral coordination geometry, defined by four N atoms from two 2-(2-pyridÂyl)-1H-benzimidazole ligands and two O atoms from a deprotonated carboxylÂate group of the 3-carbÂoxy-5-sulfonatobenzoate ligand. In the crystal structure, the complex molÂecules are linked into a three-dimensional network by interÂmolecular O—Hâ‹ŻO and N—Hâ‹ŻO hydrogen bonds, and π–π stacking interÂactions with centroid–centroid separations of 3.758 (2) and 3.597 (1) Å
Sno/scaRNAbase: a curated database for small nucleolar RNAs and cajal body-specific RNAs
Small nucleolar RNAs (snoRNAs) and Cajal body-specific RNAs (scaRNAs) are named for their subcellular localization within nucleoli and Cajal bodies (conserved subnuclear organelles present in the nucleoplasm), respectively. They have been found to play important roles in rRNA, tRNA, snRNAs, and even mRNA modification and processing. All snoRNAs fall in two categories, box C/D snoRNAs and box H/ACA snoRNAs, according to their distinct sequence and secondary structure features. Box C/D snoRNAs and box H/ACA snoRNAs mainly function in guiding 2′-O-ribose methylation and pseudouridilation, respectively. ScaRNAs possess both box C/D snoRNA and box H/ACA snoRNA sequence motif features, but guide snRNA modifications that are transcribed by RNA polymerase II. Here we present a Web-based sno/scaRNA database, called sno/scaRNAbase, to facilitate the sno/scaRNA research in terms of providing a more comprehensive knowledge base. Covering 1979 records derived from 85 organisms for the first time, sno/scaRNAbase is not only dedicated to filling gaps between existing organism-specific sno/scaRNA databases that are focused on different sno/scaRNA aspects, but also provides sno/scaRNA scientists with an opportunity to adopt a unified nomenclature for sno/scaRNAs. Derived from a systematic literature curation and annotation effort, the sno/scaRNAbase provides an easy-to-use gateway to important sno/scaRNA features such as sequence motifs, possible functions, homologues, secondary structures, genomics organization, sno/scaRNA gene's chromosome location, and more. Approximate searches, in addition to accurate and straightforward searches, make the database search more flexible. A BLAST search engine is implemented to enable blast of query sequences against all sno/scaRNAbase sequences. Thus our sno/scaRNAbase serves as a more uniform and friendly platform for sno/scaRNA research. The database is free available at
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