33 research outputs found
Hexaaquamagnesium(II) bis{[N-(4-methoxy-2-oxidobenzylidene)glycylglycinato(3−)]cuprate(II)} hexahydrate
In the title complex, [Mg(H2O)6][Cu(C12H11N2O5)]2·6H2O, the CuII atoms lie at the center of the square plane of triple negatively charged O,N,N′,O′-tetradentate Schiff base ligands, which are coordinated by one phenolate O atom, one imine N atom, one deprotonated amide N atom and one carboxylate O atom. The MgII center, which sits on an inversion center, is coordinated by six aqua ligands and exhibits a slightly distorted octahedral conformation. The asymmetric unit consists of an [N-(4-methoxy-2-oxidobenzylidene)glycylglycinato]cuprate(II) anion, one half of an [Mg(H2O)6]2+ cation and three free water molecules. The cations and anions form columns by O—H⋯O hydrogen bonds
Triaquabis{μ-N-[N-(4-methoxy-2-oxidobenzylidene)glycyl]glycinato(3−)}cadmium(II)dicopper(II) dihydrate
In the title compound, [CdCu2(C12H11N2O5)2(H2O)3]·2H2O, the CuII atoms are in a square plane of N2O2 atoms contributed by the tetradentate Schiff base trianion. The CuII atoms are coordinated by one phenolate O atom, one imine N atom, one amido N atom and one carboxylate O atom. The CdII atom is connected via the carboxylate groups, forming a heterotrinuclear CuII–CdII–CuII system. The CdII atom is seven-coordinate in a pentagonal-bipyramidal geometry with four O atoms from two carboxylate groups and three aqua ligands. The heterotrinuclear molecules are linked to the uncoordinated water molecules by O—H⋯O hydrogen bonds into a three-dimensional framework
Hexaaquacobalt(II) bis{[N-(4-methoxy-2-oxidobenzylidene)glycylglycinato]nickel(II)} hexahydrate
In the title compound, [Co(H2O)6][Ni(C12H11N2O5)]2·6H2O, the NiII atom has a nearly square-planar coordination with two N and two O atoms of the N-(4-methoxy-2-oxidobenzylidene)glycylglycinate Schiff base ligand (L
3−). The CoII atom sits on an inversion center and is coordinated to six aqua ligands in a slightly distorted octahedral geometry. The [Co(H2O)6]2+ cations and [NiL]− anions form columns along the a axis by O—H⋯O hydrogen bonds. Additional hydrogen bonds between the uncoordinated and coordinated water molecules help to consolidate the crystal packing
A Gigantic Mid-Infrared Outburst in an Embedded Class-I Young Stellar Object J064722.95+031644.6
We report the serendipitous discovery of a giant mid-infrared (MIR) outburst
from a previously unknown source near a star-forming region in the
constellation Monoceros. The source gradually brightened by a factor of 5 from
2014 to 2016 before an abrupt rise by a factor of more than 100 in 2017. A
total amplitude increase of >500 at 4.5 microns has since faded by a factor of
about 10. Prior to the outburst, it was only detected at wavelengths longer
than 1.8 microns in UKIDSS, Spitzer, and Herschel with a spectral energy
distribution of a Class I Young Stellar Object (YSO). It has not been detected
in recent optical surveys, suggesting that it is deeply embedded. With a
minimum distance of 3.5 kpc, the source has a bolometric luminosity of at least
9 in the quiescent state and 400 at the peak of the
eruption. The maximum accretion rate is estimated to be at least a few
year. It shares several common properties with
another eruptive event, WISE~J142238.82-611553.7: exceptionally large
amplitude, featureless near-infrared spectrum with the exception of H_2 lines,
intermediate eruption duration, an embedded Class I YSO, and a low radiative
temperature (<600-700 K) in outburst. We interpret that the radiation from the
inner accretion disk and young star is obscured and reprocessed by either an
inflated outer disk or thick dusty outflow on scales > 6.5 AU during the
outburst.Comment: 15 pages, 7 figures, accepted to Ap
Energy Route Multi-Objective Optimization of Wireless Power Transfer Network: An Improved Cross-Entropy Method
This paper identifies the Wireless Power Transfer Network (WPTN) as an ideal model for long-distance Wireless Power Transfer (WPT) in a certain region with multiple electrical equipment. The schematic circuit and design of each power node and the process of power transmission between the two power nodes are elaborated. The Improved Cross-Entropy (ICE) method is proposed as an algorithm to solve for optimal energy route. Non-dominated sorting is introduced for optimization. A demonstration of the optimization result of a 30-nodes WPTN system based on the proposed algorithm proves ICE method to be efficacious and efficiency
A SE-DenseNet-LSTM model for locomotion mode recognition in lower limb exoskeleton
Locomotion mode recognition in humans is fundamental for flexible control in wearable-powered exoskeleton robots. This article proposes a hybrid model that combines a dense convolutional network (DenseNet) and long short-term memory (LSTM) with a channel attention mechanism (SENet) for locomotion mode recognition. DenseNet can automatically extract deep-level features from data, while LSTM effectively captures long-dependent information in time series. To evaluate the validity of the hybrid model, inertial measurement units (IMUs) and pressure sensors were used to obtain motion data from 15 subjects. Five locomotion modes were tested for the hybrid model, such as level ground walking, stair ascending, stair descending, ramp ascending, and ramp descending. Furthermore, the data features of the ramp were inconspicuous, leading to large recognition errors. To address this challenge, the SENet module was incorporated, which improved recognition rates to some extent. The proposed model automatically extracted the features and achieved an average recognition rate of 97.93%. Compared with known algorithms, the proposed model has substantial recognition results and robustness. This work holds promising potential for applications such as limb support and weight bearing
Sequential Bioprocess with <i>Gluconobacter oxydans</i> and <i>Candida tropicalis</i> for Gluconic Acid and Single-Cell Protein Production from Enzymatic Hydrolysate
To meet the growing global demand for gluconic acid as a cement and concrete retarder, inexpensive and abundant lignocellulosic materials are regarded as the most suitable alternatives to starchy materials. However, their enzymatic hydrolysate contains not only glucose but also xylose, which negatively affects the performance of gluconic acid as a retarder. Notably, glucose is preferentially bio-oxidized into gluconic acid by Gluconobacter oxydans, but gluconic acid cannot be metabolized by Candida tropicalis. Given this, an artificially designed biological cascade process, respectively employing Gluconobacter oxydans and Candida tropicalis, was established to successfully carry out glucose conversion into gluconic acid, and xylose into a single-cell protein, using the enzymatic hydrolysate of corncobs as a feedstock. This sequential fermentation process produced 95.8 g/L gluconic acid and 9.0 g/L single-cell protein from one liter of the enzymatic hydrolysate that initially contained 98.1 g/L of glucose and 25.4 g/L of xylose. The mass-balance calculation showed that approximately 280 grams of gluconic acid and 27 grams of the single-cell protein could be harvested from 1000 grams of the corncob feedstock. The results suggest that the above-mentioned two-step bioconversion method is efficient in utilizing glucose and xylose from lignocellulosic hydrolysates