检索结果-南通市图书馆

Laser solid-phase synthesis of graphene shellencapsulated high-entropy alloy nanoparticles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第11期13卷 2781-2793页

作者： Yuxiang Liu Jianghuai Yuan Jiantao Zhou Kewen Pan Ran Zhang Rongxia Zhao Lin Li Yihe Huang Zhu Liu research centre for Laser Extreme Manufacturing Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China

Rapid synthesis of high-entropy alloy nanoparticles(HEA NPs)offers new opportunities to develop functional materials in widespread *** some methods have successfully produced HEA NPs,these methods generally require rigorous conditions such as high pressure,high temperature,restricted atmosphere,and limited substrates,which impede practical *** this work,we report laser solid-phase synthesis of CrMnFeCoNi nanoparticles by laser irradiation of mixed metal precursors on a laser-induced graphene(LIG)support with a 3D porous *** CrMnFeCoNi nanoparticles are embraced by several graphene layers,forming graphene shell-encapsulated HEA *** mechanisms of the laser solid-phase synthesis of HEA NPs on LIG supports are investigated through theoretical simulation and experimental observations,in consideration of mixed metal precursor adsorption,thermal decomposition,reduction through electrons from laser-induced thermionic emission,and liquid beads *** production rate reaches up to 30 g/h under the current laser *** laser-synthesized graphene shell-encapsulated CrMnFeCoNi NPs loaded on LIG-coated carbon paper are used directly as 3D binder-free integrated electrodes and exhibited excellent electrocatalytic activity towards oxygen evolution reaction with an overpotential of 293 mV at the current density of 10 mA/cm2 and exceptional stability over 428 h in alkaline media,outperforming the commercial RuO2 catalyst and the relevant catalysts reported by other *** work also demonstrates the versatility of this technique through the successful synthesis of CrMnFeCoNi oxide,sulfide,and phosphide nanoparticles.

关键词： structure. synthesis entropy

Epidemiology of injuries in male and female youth football players:A systematic review and meta-analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2022年第6期11卷 681-695,F0003页

作者： Francisco Javier Robles-Palazón Alejandro López-Valenciano Mark De Ste Croix Jon L.Oliver Alberto García-Gómez Pilar Sainz de Baranda Francisco Ayala Department of Physical activity and Sport Faculty of Sport SciencesCampus of Excellence Mare NostrumUniversity of MurciaMurcia 30720Spain centre for Sport Studies King Juan Carlos UniversityMadrid 28933Spain School of Sport and Exercise University of GloucestershireGloucester GL29HWUK Youth Physical Development centre School of Sport and Health SciencesCardiff Metropolitan UniversityCardiff CF236XDUK Sport Performance research Institute New Zealand(SPRINZ) Auckland University of TechnologyAuckland 0632New Zealand Operative research centre Miguel Hernández University of ElcheElche 03202Spain

Background:To conduct a systematic review and meta-analysis of epidemiological data of injuries in male and female youth football ***:Searches were performed in MEDLINE/PubMed,Web of Science,Cochrane Library,and SPORTDiscus *** were considered if they reported injury incidence rate in male and female youth(≤19 years old)football *** reviewers(FJRP and ALV)extracted data and assessed trial quality using the Strengthening the Reporting of Observational Studies in Epidemiology(STROBE)statement and the Newcastle Ottawa *** Grading of Recommendations Assessment,Development,and Evaluation approach determined the quality of *** were combined using a Poisson random effects regression ***:Forty-three studies were *** overall incidence rate was 5.70 injuries/1000 h in males and 6.77 injuries/1000 h in *** injury incidence(14.43 injuries/1000 h in males and 14.97 injuries/1000 h in females)was significantly higher than training injury incidence(2.77 injuries/1000 h in males and 2.62 injuries/1000 h in females).The lower extremity had the highest incidence rate in both *** most common type of injury was muscle/tendon for males and joint/ligament for *** injuries were the most common in both *** incidence rate of injuries increased with advances in chronological age in *** male players presented higher match injury incidence than sub-elite *** females,there was a paucity of data for comparison across age groups and levels of ***:The high injury incidence rates and sex differences identified for the most common location and type of injury reinforce the need for implementing different targeted injury-risk mitigation strategies in male and female youth football players.

关键词： Incidence Muscle injuries Severity Soccer Young athletes

Regulation of natural killer cell activity by glucocorticoids,serotonin,dopamine,and epinephrine

在线全文

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2020年第7期17卷 705-711页

作者： Silvia Capellino Maren Claus Carsten Watzl Department for Immunology Leibniz Research Centre for Working Environment and Human Factors(IfADo)at TU DortmundDortmundGermany

The immune system and the nervous system are highly complex organs composed of various different cells that must interact with each other for proper function of the *** communication can be mediated by soluble *** factors released by the nervous system(neurotransmitters)differ from those released by the immune system(cytokines).Nevertheless,the nervous and immune systems can influence each other’s activity because immune cells express neurotransmitter receptors,and neurons express cytokine ***,immune cells can synthesize and release neurotransmitters themselves,thus using neurotransmittermediated pathways via autocrine and paracrine *** killer(NK)cells are innate lymphocytes that are important for early and effective immune reactions against infections and *** studies have shown the strong influence of stress and the nervous system on NK cell *** phenomenon may be one reason why chronic stress leads to a higher incidence of infections and ***,we review the effects of neuroendocrine factors on the different activities of NK *** the effects of neuroendocrine factors on NK cell activities during physiological and pathophysiological conditions may result in novel therapeutic strategies to enhance NK cell functions against tumors.

关键词： Natural Killer Cells Catecholamines Glucocorticoids Neurotransmitters

Synthesis of a sulfur-graphene composite as an enhanced metal-free photocatalyst

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano research 2013年第4期6卷 286-292页

作者： Wenchao Peng Xiaoyan Li Environmental Engineering research centre Department of Civil Engineering The University of Hong Kong Pokfulam Hong Kong China

A novel metal-free photocatalyst--sulfur/graphene （S/GR） composite--has been synthesized using a facile one-pot, two-step hydrothermal method with thiosulfate and graphene oxide （GO） as precursors. A green reductant--L-ascorbic add--was used to transform GO to GR under mild conditions. The photocatalyst powders were characterized by Fourier transform infrared spectroscop, X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and energy dispersive spectroscopy. Experimental tests were conducted on the photocatalytic decomposition of methyl orange （MO） by different catalysts. Compared to pure oL-S, the as-prepared S/GR composite showed much enhanced photocatalytic activity for the degradation of MO under both UV and solar light. The presence of GR also greatly increased the hydrophilicity and adsorption capacity of the catalyst material. The results indicate that the incorporation of GR with a-S results in a synergistic effect for the S-based photocatalysts offering more effective environmental applications.

关键词： metal-free catalyst a-sulfur graphene photocatalysis methyl orange organic degradation

The Springtime North Asia Cyclone activity Index and the Southern Annular Mode

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2008年第4期25卷 673-679页

作者：乐旭王会军 Nansen-Zhu International research centre(NZC) Institute of Atmospheric Physics(IAP)Chinese Academy of Sciences(CAS)

The relationship between the North Asia cyclone （NAC） activity and the Southern Annular Mode （SAM） is documented in this research. The definition of the NAC index （NACI） is based on the atmospheric relative vorticity in North Asia. The analysis yields a significant positive correlation between previous winter Southern Annular Mode index （SAMI） and spring NACI in the interannual variability, with a correlation coefficient of 0.51 during 1948-2000. Analysis of the NAC-related and SAM-related atmospheric general circulation variability demonstrates such a relationship. The study further reveals that when the winter SAM becomes strong, the springtime atmospheric convection in tropical western Pacific will intensify and the local Hadley circulation will be strengthened. As a result, the abnormal subsiding motion over South China makes the temperature gradient intensified in the low level and strengthens the jet in the high level, both of which are beneficial to the development of NAC activity.

关键词： North Asia cyclone Southern Annular Mode atmospheric general circulation

Intercomparison of Himawari-8 AHI-FSA with MODIS and VIIRS active fire products

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2020年第4期13卷 457-473页

作者： Chathura Wickramasinghe Luke Wallace Karin Reinke Simon Jones School of Science RMIT UniversityMelbourneAustralia Bushfire and Natural Hazards Cooperative research centre MelbourneAustralia

The AHI-FSA(Advanced Himawari Imager-Fire Surveillance Algorithm)is a recently developed algorithm designed to support wildfire surveillance and mapping using the geostationary Himawari-8 *** present,the AHI-FSA algorithm has only been tested on a number of case study fires in Western *** results demonstrate potential as a wildfire surveillance algorithm providing high frequency(every 10 minutes),multi-resolution fire-line *** paper intercompares AHI-FSA across the Northern Territory of Australia(1.4 million km2)over a ten-day period with the well-established fire products from LEO(Low Earth Orbiting)satellites:MODIS(Moderate Resolution Imaging Spectroradiometer)and VIIRS(Visible Infrared Imaging Radiometer Suite).This paper also discusses the difficulties and solutions when comparing high temporal frequency fire products with existing low temporal resolution LEO satellite *** results indicate that the multi-resolution approach developed for AHI-FSA is successful in mapping fire activity at 500 *** compared to the MODIS,daily AHIFSA omission error was only 7%.High temporal frequency data also results in AHI-FSA observing fires,at times,three hours before the MODIS overpass with much-enhanced detail on fire movement.

关键词： AHI-FSA wildfire surveillance intercomparison Himawari-8

A new class of HIV-1 inhibitors and the target identification via proteomic profiling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2018年第11期61卷 1430-1439页

作者： Ying-Zi Ge Bin Zhou Ruo-Xuan Xiao Xiao-Jing Yuan Hu Zhou Ye-Chun Xu Mark A.Wainberg Ying-Shan Han Jian-Min Yue State Key Laboratory of Drug research Shanghai Institute of Materia Medica Chinese Academy of Sciences McGill University AIDS centre Lady Davis Institute for Medical Research Jewish General Hospital

Anti-HIV screening with the MT-4/MTT assay on a focused library of structurally diverse natural products has led to the discovery of a group of steroids with potent activities, which include four new ergostane-type steroids, named amotsterols A-D （1-4）, together with two known analogs. Among them, the most potent amotsterol D （4） exhibited anti-HIV activity against wild- type and some clinically relevant multidrug resistant HIV-I strains. Subsequent studies on its target identification through a proteomic approach found that compound 4 might target PKM2, a rate limiting enzyme ofglycolysis, in host cells to restrict HIV replication. The docking model of compound 4 to PKM2 showed that the two hydroxyl groups of 4 form hydrogen bonds with the two parallel Y390 in each subunit of PKM2 separately, and the ring C of 4 is sandwiched between the two parallel aromatic rings ofF26. The identified hit compound may have the potential to be further developed as a novel anti-HIVagent. These results demonstrated that an integrated approach, which combines new chemical structures and phenotypic screening with a proteomic approach, could not only identify novel HIV-1 inhibitors, but also elucidate the unknown targets of compound interactions in antiviral drug discovery.

关键词： ergostane-type steroids anti-HIV target identification PKM2

The synthesis of 6-(tert-butyl)-8-fluoro-2,3-dimethylquinoline carbonate derivatives and their antifungal activity against Pyricularia oryzae

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2019年第2期13卷 369-376页

作者： Long Cheng Ruirui Zhang Hongke Wu Xinghai Liu Tianming Xu College of Chemical Engineering Zhejiang University of TechnologyHangzhou 310014China Zhejiang Base of National Southern Pesticide research centre Zhejiang Research Institute of Chemical IndustryHangzhou 310023China

A series of novel 6-(/er/-butyl)-8-fluoro-2,3- dimethylquinoline carbonate derivatives were designed and synthesized. Bioassay results showed that some of them exhibited good activity against Pyricularia oryzae (P. oryzae). It was found that the compound 5q (benzyl (6-(tert-butyl)-8-fluoro-2,3-dimethylquinolin-4-yl) carbonate) possessed good activity against P. oryzae whatever protective activity (10 mg·L^-1) or curative activity (25 mg·L^-1), which was better than that of control tebufloquin. In addition, the frontier molecular orbit results revealed that the compound held higher activity against P. oryzae when the total energy was low and the ClogP was high, which may provide useful information for further design novel fungicides.

关键词： quinoline synthesis antifungal activity rice blast SAR

Synthesis, insecticidal activities and DFT study of pyrimidin-4-amine derivatives containing the 1,2,4-oxadiazole motif

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2022年第7期16卷 1090-1100页

作者： Yong-Hui Wen Long Cheng Tian-Ming Xu Xing-Hai Liu Ning-Jie Wu College of Chemical Engineering Zhejiang University of TechnologyHangzhou 310014China Zhejiang Base of National Southern Pesticide research centre Zhejiang Research Institute of Chemical IndustryHangzhou 310023China

Twenty six novel pyrimidin-4-amine derivatives containing the 1,2,4-oxadiazole motif were synthesized. Their chemical structures were confirmed by ^(1)H nuclear magnetic resonance (NMR), ^(13)C NMR, and high-resolution mass spectrography. The insecticidal activity results indicated that some of them possessed excellent insecticidal activity (100%) against Mythimna separate, especially for compounds 6d, 6f, 6o, 6w, 6y and 6z. These compounds exhibited no activity against the insects Aphis medicagini and Tetranychus cinnabarinus. The structure- insecticidal activity relationships are discussed. Density functional theory analysis can potentially be used to design more active compounds. These results provide useful insecticide design information for further optimization.

关键词： synthesis pyrimidin-4-amine derivatives 1,2,4-oxadiazole insecticidal activity structure-activity relationship