3,645 research outputs found
(1SR,2RS,3SR,5SR,6RS)-6-[(Z)-1-Acetoxy-2-phenylethenyl]-3-ethoxy-2-phenylbicyclo[3.1.0]hexan-1-yl acetate
The molecule of the title compound, C26H28O5, is chiral with five stereogenic centres; however, the centrosymmetric triclinic group gives a racemic crystal. The fused ring system adopta boat conformation in which the cyclopropane ring plane is roughly perpendicular to the styryl group plane, forming a dihedral angle of 74.78 (19)°. The dihedral angle between the two benzene rings is 77.24 (6)°
Galactic Cosmic Rays Modulation in the Vicinity of Corotating Interaction Regions: Observations During the Last Two Solar Minima
Corotating interaction regions (CIRs) are responsible for short-term recurrent cosmic-ray modulation, prominent near solar minima. Using the OMNI data sets for two periods of low solar activity near the beginning and end of solar cycle 24, superposed epoch analysis was performed on the solar wind plasma features for 53 and 43 events during periods 2007–2008 and 2017–2018, respectively. Turbulent properties of the solar wind were studied using the variance method for each CIR. Power spectra have been constructed for overlapped subintervals in the vicinity of stream interfaces (SIs). Using measured correlation lengths and turbulent energies, parallel and perpendicular diffusion mean free paths for cosmic-ray ions have been inferred based on two distinct theoretical formulations. For the two periods with opposite solar polarities, our results show that unlike solar wind speed, magnetic field strength, flow pressure, and proton density are relatively higher during the latest period. Increased turbulent energy and reduced parallel transport coefficients of energetic particles at the SIs are observed. The diffusion coefficients follow the same trends during both periods. The perpendicular diffusion starts increasing nearly a day before SIs and is higher in the fast wind. Superposed epoch analysis is performed on the >120 MeV proton count rate obtained from the CRIS instrument on board the ACE spacecraft for the same events. The recorded proton rates have peaks half a day before a SI and reach their minimum more than a day after a SI and have a high anticorrelation with the perpendicular diffusion coefficient
Case Report: A rare case of non-small cell lung cancer with STRN-ALK fusion in a patient in very poor condition treated with first-line ensartinib
Several cases of STRN-ALK fusion have been reported, and some anaplastic lymphoma kinase (ALK) inhibitors have been shown to be effective for treatment. Nevertheless, no cases of COVID-19 leading to heart failure and respiratory failure have been reported in people older than 70 years treated with ALK inhibitors. The present case report describes a 70-year-old patient with usual chronic obstructive pulmonary disease, diabetes, depression, and carotid plaque disease. Next-generation sequencing of tissue obtained by puncture biopsy revealed a STRN-ALK mutation accompanied by a TP53 mutation. The patient was treated with ensartinib and developed COVID-19 leading to heart failure and respiratory failure; nevertheless, he had a good clinical outcome and exhibited high treatment tolerability
Labeling-Free Comparison Testing of Deep Learning Models
Various deep neural networks (DNNs) are developed and reported for their
tremendous success in multiple domains. Given a specific task, developers can
collect massive DNNs from public sources for efficient reusing and avoid
redundant work from scratch. However, testing the performance (e.g., accuracy
and robustness) of multiple DNNs and giving a reasonable recommendation that
which model should be used is challenging regarding the scarcity of labeled
data and demand of domain expertise. Existing testing approaches are mainly
selection-based where after sampling, a few of the test data are labeled to
discriminate DNNs. Therefore, due to the randomness of sampling, the
performance ranking is not deterministic. In this paper, we propose a
labeling-free comparison testing approach to overcome the limitations of
labeling effort and sampling randomness. The main idea is to learn a Bayesian
model to infer the models' specialty only based on predicted labels. To
evaluate the effectiveness of our approach, we undertook exhaustive experiments
on 9 benchmark datasets spanning in the domains of image, text, and source
code, and 165 DNNs. In addition to accuracy, we consider the robustness against
synthetic and natural distribution shifts. The experimental results demonstrate
that the performance of existing approaches degrades under distribution shifts.
Our approach outperforms the baseline methods by up to 0.74 and 0.53 on
Spearman's correlation and Kendall's , respectively, regardless of the
dataset and distribution shift. Additionally, we investigated the impact of
model quality (accuracy and robustness) and diversity (standard deviation of
the quality) on the testing effectiveness and observe that there is a higher
chance of a good result when the quality is over 50\% and the diversity is
larger than 18\%.Comment: 12 page
[3-Bromomethyl-1-(4-methylphenylsulfonyl)azetidin-3-yl]methanol
The asymmetric unit of the title compound, C12H16BrNO3S, contains two independent molecules. In each molecule, the azetidine four-membered ring adopts a nearly planar conformation, the maximum deviations being 0.087 (3) and 0.079 (3) Å. The mean azetidine plane is twisted by 75.2 (2) and 73.6 (2)° with respect to the plane of the benzene ring in the two independent molecules. The crystal packing is stabilized by O—H⋯O hydrogen bonds
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