Methyl 3-(cyclo­propyl­meth­oxy)-4-hy­droxy­benzoate. Corrigendum

Corrigendum to Acta Cryst. (2010), E66, o2004

3-Bromo-1-(3-chloro­pyridin-2-yl)-N-(4-eth­oxy­phen­yl)-1H-pyrazole-5-carbox­amide

In the title compound, C17H14BrClN4O2, the pyrazole ring is almost coplanar with the benzene ring [dihedral angle = 0.5 (2)°], whereas the pyrazole ring is close to perpendicular to the 3-chloro­pyridine ring [dihedral angle = 73.7 (2)°]. An intra­molecular C—H⋯O hydrogen bond occurs. The dominant inter­action in the crystal packing is an N—H⋯N hydrogen bond, which generates a chain along the c axis. Weak inter­molecular C—H⋯O and C—H⋯N contacts are also observe

Methyl 3-(cyclo­propyl­meth­oxy)-4-hy­droxy­benzoate

In the title compound, C12H14O4, the dihedral angle between the benzene ring and the cyclo­propyl ring is 60.3 (4)°. In the crystal structure, mol­ecules are linked by inter­molecular O—H⋯O hydrogen bonds into chains running parallel to [101]

Methyl 3,4-bis­(cyclo­propyl­meth­oxy)benzoate

The title compound, C16H20O4, was obtained unintentionally as the byproduct of an attempted synthesis of methyl 3-(cyclo­propyl­meth­oxy)-4-hy­droxy­benzoate. In the crystal, the mol­ecules are linked by inter­molecular C—H⋯O inter­actions

N-Methyl-3,5-dinitro­benzamide

The asymmetric unit of the title compound, C8H7N3O5, contains two independent mol­ecules in which the amide plane is oriented at dihedral angles of 29.82 (2) and 31.17 (2)° with respect to the benzene ring. In the crystal, mol­ecules are connected via inter­molecular N—H⋯O hydrogen bonds, forming chains running along the b axis

(E)-N′-[(E)-3-Phenyl­allyl­idene]benzo­hydrazide

In the title mol­ecule, C16H14N2O, the dihedral angle between the two phenyl rings is 23.5 (6)°. In the crystal, N—H—O hydrogen bonds link mol­ecules into chains running along the a axis

Detection of Quasi-periodic Oscillations in SGR 150228213

The detection of quasi-periodic oscillations (QPOs) in magnetar giant flares (GFs) has brought a new perspective to study the mechanism of magnetar bursts. Due to the scarcity of GFs, searching QPOs from magnetar short bursts is reasonable. Here we report the detection of a high frequency QPO at approximately 110 Hz and a wide QPO at approximately 60 Hz in a short magnetar burst SGR 150228213, with a confidence level of 3.35$\sigma$. This burst was initially attributed to 4U 0142+61 by $Fermi$/GBM on location, but we haven't detected such QPOs in other bursts from this magnetar. We also found that there was a repeating fast radio burst associated with SGR 150228213 on location. Finally, we discuss the possible origins of SGR 150228213

Comparative analysis of SOFC-MGT top-level and new bottom-level system performance

In order to make the SOFC-MGT system more widely used, the mathematical simulation models of the SOFC-MGT top-level circulatory system and the new bottom circulatory system were first established, and then the performance of the two systems was analyzed and compared using Matlab/Simulink simulation software. The research results show that the output performance of the SOFC-MGT top-level circulation system is due to the new bottom-level circulation system, and the stack output performance of the two systems is not much different

Berry Curvature and Bulk-Boundary Correspondence from Transport Measurement for Photonic Chern Bands

Berry curvature is a fundamental element to characterize topological quantum physics, while a full measurement of Berry curvature in momentum space was not reported for topological states. Here we achieve two-dimensional Berry curvature reconstruction in a photonic quantum anomalous Hall system via Hall transport measurement of a momentum-resolved wave packet. Integrating measured Berry curvature over the two-dimensional Brillouin zone, we obtain Chern numbers corresponding to -1 and 0. Further, we identify bulk-boundary correspondence by measuring topology-linked chiral edge states at the boundary. The full topological characterization of photonic Chern bands from Berry curvature, Chern number, and edge transport measurements enables our photonic system to serve as a versatile platform for further in-depth study of novel topological physics