The first mixed-valent octamolybdate anion MoV4MoVI4O244-, termed Delta *y-octamolybdate due to its shape, was obtained by partial reduction of -(Bu4N)4Mo8O26 in dry acetonitrile. Single-crystal ...X-ray structure analysis revealed that the anion includes an unusual MoV4O8 cubane-like cluster core, whose four side faces are capped by four MoO4 units to form a crosslike cluster. X-ray photoelectron spectroscopy (XPS) and bond valence sum (BVS) calculations were carried out to validate the presence of mixed-valent Mo centers.
The antibacterial composite based on bacterial cellulose (BC) was successfully prepared by in-situ synthesis of SiO2 coated Cu nanoparticles (Cu@SiO2/BC) and its properties were characterized. Its ...chemical structures and morphologies were evaluated by Fourier transformation infrared spectrum (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results demonstrated that the SiO2 coated Cu particles were well homogeneously precipitated on the surface of BC. The Cu@SiO2/BC was more resistant to oxidation than the Cu nanoparticles impregnated into BC (Cu/BC) and then Cu@SiO2/BC could prolong the antimicrobial activity against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli).
Schematic illustration of the preparation of Cu@SiO2/BC.
Due to its unique structure, the Cu@SiO2/BC membrane shows excellent antibacterial effects and can be used for a long time. Display omitted
•This work paves the novel way to fabricate antibacterial nanomaterial with good efficiency.•We prepare the antibacterial membrane based on bacterial cellulose by in-situ synthesis of SiO2-coated Cu nanoparticles.•The antibacterial membrane is more resistant to oxidation and can prolong the antimicrobial activity.
In this paper, a new type of natural adsorption materials were prepared by spray granulation. The structure and properties of the product were characterized by scanning electron microscope analysis, ...N2 adsorption desorption analysis, infrared analysis, X ray diffraction analysis, the rmogravimetric analysis. The results showed that: the best preparation conditions of the adsorption materials were as follows: the temperature was 59.21°C, the pressure was 0.28 Bar, and the rate was 14.15 ml/min. In addition, the natural materials had high porosity and specific surface areas , which was better for adsorption. The pore size was mainly concentrated between 13 ~ 28nm. Moreover, these materials had more functional groups. The decomposition temperature was 250°C,which resulted in better thermal stability. Consequently, the materials had better adsorption properties, and the materials will have better application prospect.
Recent evidence indicates the potential role of vitamin D in the prevention of Metabolic syndrome (MetSyn). This is an analytical cross sectional study. A total of 3275 subjects were investigated. ...25-hydroxyvitamin D(25OHD) was detected by electrochemiluminescence immunoassay (ECLIA) technology. Metabolic syndrome was defined according to the definition of International Diabetes Federation (IDF). Among the participants, the prevalence of the MetSyn was 6.0%. The prevalence of vitamin D deficiency and insufficiency was 50.1% and 25.0% respectively. Subjects with MetSyn presented with significantly lower 25(OH)Vit D serum levels compared with non-MetSyn group. The results shows that vitamin D deficiency is common in Chinese adults, and subjects with lower serum 25(OH)D have a higher risk of the MetSyn. The cut-off value of serum 25(OH)D that reflected MetSyn in Chinese adluts was 15.655 ng/mL.
In order to improve the quality and accuracy of blanking workpiece, reasonable measures have been proposed during the production process. Firstly, the quality precision of blanking workpiece has been ...classified into three grades, corresponding to each type of dimensional accuracy, reasonal range of blanking clearance has been selected. Then the relationship of blanking clearance size with blanking quality has also been analyzed, and the affection of blanking clearances to dimensional accuracy has also been analyzed.At last, the method to improve the workpiece quality has been proposed, and the measure has been put forward to solve problems of quality and accuracy. The results refer useful references to improve the quality of stampings.
A prototype RF power source for CSNS/RCS Huang, WeiLing; Sun, Hong; Zhao, HaiQi ...
Science China. Physics, mechanics & astronomy,
12/2011, Volume:
54, Issue:
Suppl 2
Journal Article
Peer reviewed
A prototype RF power source has been built to supply high RF power to a ferrite-loaded cavity, which is a part of R&D of the Rapid Cycling Synchrotron of China Spallation Neutron Source (CSNS/RCS). A ...direct fast RF feedback amplifier, a 4:1 impedance transformer and auto tuning grid were locally located to compensate the heavy beam loading of CSNS/RCS. Design and commissioning of the RF power source is discussed here, also with some advice on system improvement.
To explore the significance of 2-hour blood glucose after standardized steamed bread meal (SB-2 hBG) in diabetic screening.
A retrospective study was conducted for diabetic screening data of annual ...check-up at PLA General Hospital from May 1996 to June 2002. And 100 g standardized steamed bread meal test was performed for non-diabetic subjects. Those subjects with SB-2 h BG ≥ 7.2 mmol/L underwent a 75 g oral glucose tolerance test (OGTT) within 2 weeks to determine whether the diagnosis of diabetes mellitus (DM) could be established (WHO, 1985, 1999, Diagnostic Criteria for Diabetes). By extracting the data for 7 consecutive years, we analyzed the significance and the cut-off point of SB-2 hBG in the diagnosis of DM and investigated the changes of blood glucose curves in different glucose tolerance status after different glucose loading tests.
A total of 3 343 subjects with complete information were recruited. There were 3 101 males and 242 females with an age range of 40-94 years. According to the results of
Recently, Profile-based Spoken Language Understanding (SLU) has gained increasing attention, which aims to incorporate various types of supplementary profile information (i.e., Knowledge Graph, User ...Profile, Context Awareness) to eliminate the prevalent ambiguities in user utterances. However, existing approaches can only separately model different profile information, without considering their interrelationships or excluding irrelevant and conflicting information within them. To address the above issues, we introduce a Heterogeneous Graph Attention Network to perform reasoning across multiple Profile information, called Pro-HAN. Specifically, we design three types of edges, denoted as intra-Pro, inter-Pro, and utterance-Pro, to capture interrelationships among multiple Pros. We establish a new state-of-the-art on the ProSLU dataset, with an improvement of approximately 8% across all three metrics. Further analysis experiments also confirm the effectiveness of our method in modeling multi-source profile information.
A novel salt of Keggin-type polyoxometalate and histidine formulated (H
2
His)
2
SiMo
12
O
40
·4H
2
O(
1
) was synthesized directly from small molecules. Its crystal structure showed that both ...left-handed and right-handed protonated histidines fill into identical interstice provided by the SiMo
12
O
40
anions and crystal water molecules.
