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A Facile Synthesis of n-Substituted Spirocyclic Diester of α-Aminophosphonic Acid

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ch.nese chemical Letters 1998年第1期9卷 11-12页

作者： Qing DAI Hua wo Ru Yu ch.n(Institute and State’s Key Laboratory of Elemento-Organic chemistry,nankai University, Tianjin 300071) Inst./State's Key Lab. Elemento-O.C. Nankai University Tianjin 300071 China

A simple and direct method for preparation of n-substituted spirocyclic dieSter of □-amino phosphonic acid (4) in high yield is introduced. The reaction consists of the threecomponent reach.n of phenylurea (1), an aromatic aldehyde (2), and 3,9-dichloro-2,4,8,10-tetraoxa- 3, 9 -diphosphaspiro [5,5] undecane (3) in anhydrous benzene.

关键词： Spirocyclic diester α-aminophosphonic acid

Plasma enhanced diamond deposition on steel and Si substrates

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Acta Metallurgica Sinica(English Letters) 2009年第5期22卷 321-329页

作者： Y.S. Li Y. Tang wo ch.n Q. Yang C.Xiao A. Hirose Plasma PhYsics Laboratory University of Saskatchewan Saskatoon SK S7N 5E2 Canada Department of Mech.nical Engineering University of Saskatchewan Saskatoon S7N 5A9 Canada

Diamond growth on Fe-Cr-Al-Si steel and Si substrates was comparatively investigated in microwave plasma enhanced chemical vapor deposition （MPCVD） reactor with different deposition parameters. Adherent nanocrystalline diamond films were directly deposited on this steel substrate under a typical deposition condition, whereas microcrystalline diamond films were produced on Si wafer. With increasing ch4 concentration, reaction pressure, or the total gas flow rate, the quality of nanocrystalline diamond films formed on Fe-Cr-Al-Si substrates is gradually deteriorated in terms of density and adhesion. This impaired diamond quality on steels is primarily associated with a combined effect by the substrate composition and the specific process conditions that favor excessive nucleation of diamond.

关键词： Plasma CVD Diamond film Steel Si

In vivo and in situ real-time fluorescence imaging of peripheral nerves in the nIR-II window

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nano Research 2019年第12期12卷 3059-3068页

作者： Zhujun Feng Yimeng Yang Jian Zhang Kan Wang Yunxia Li Heng Xu Zhen Wang Ewelina Biskup Shixian Dong Xing Yang Yuefeng Hao Jun ch.n Yan wo Department of Anatomy and Physiology School of MedicineShanghai Jiao Tong UniversityShanghai 200025China Sports Medicine Institute ofFudan University Department of Orthopedic Sports MedicineHuashan HospitalFudan UniversityShanghaiChina Department of Instrument Science and Engineering School of Electronic Information and Electrical EngineeringShanghai Jiao long UniversityShanghai Engineering Research Center for Intelligent diagnosis and treatment instrumentKey Laboratory of Thin Film and Microfabrication(Ministry of Education)Shanghai 200240China Department of Plastic Surgery Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China Department cf physical education Fudan UniversityShanghai 200040China Department of Internal Medicine University Hospital of BaselPetersgraben 44051 BaselSwitzerland Department of orthopedics Affiliated Suzhou Hospital of Nanjing Medical UniversitySuzhou 215500China

The peripheral nervous system(PnS)is essential for performing and maintaining various motor and sensory *** can lead to a series of peripheral neurological conditions,such as paraesthesia,pain,or spasms,which are debilitating and lowering the quality of *** guidelines for diagnosis rely predominantly on clinical symptoms resulting from PnS dysfunction,which occur already at an *** are currently no effective methods that visually reflect the extent of peripheral *** our study,we present a novel in vivoand in situ real-time imaging of peripheral nerves based on the second near-infrared window(nIR-II)fluoresce *** nIR-II system,lead sulfidequa ntum dots(PbS Qds)with nIR-II fluoresce nee specifically bound to motor neuro rvspecific protein agrin,acting as image con *** micemodel,peripheral nerves were visible as soon as after 2 h post *** provide evidenee for the efficacy of this approach,which allows todirectly dem on strate peripheral nerves,their structure,and pote ntial damagesites and ***,our products were of goodbiocompatibility,while the n eural fluoresce nee signal was solid,bright and stable for 4 h in ***,overall,our results suggest that nIR-II isan effective new method for direct imaging of peripheral nerves in vivo,opening new horizons on early,improved and more precise,targeteddiag no sis.A resulti ng more rapid installatio n of perso nalized therapy facilitates a better prognosis of clinical peripheral neuropathy.

关键词： peripheral nerve the second near-infrared window(nIR-II) fluorescent imaging Agrin@PbS Qds biocompatibility

Evaluating the phyto-complexity and poly-pharmacology of spices: The case of Aframomum melegueta K. Schum (Zingiberaceae)

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Food Bioscience 2022年第5期49卷 1230-1245页

作者： Simon Vlad Luca Adriana Trifan Gokhan Zengin Kouadio Ibrahim Sinan Abdullahi Ibrahim Uba Izabela Korona-Glowniak Krystyna Skalicka-wo´zniak Biothermodynamics TUM School of Life SciencesTechnical University of Munich85354FreisingGermany Department of Pharmacognosy Grigore T.Popa University of Medicine and Pharmacy Iasi700115IasiRomania Physiology and Biochemistry Research Laboratory Department of BiologyScience FacultySelcuk UniversityUniversity Campus42130KonyaTurkey Department of Molecular Biology and Genetics Faculty of Engineering and Natural SciencesKadir Has UniversityIstanbul34083Turkey Department of Pharmaceutical Microbiology Faculty of PharmacyMedical University of Lublin20-093LublinPoland Department of natural Products chemistry Medical University of Lublin20-093LublinPoland

The seeds of Aframomum melegueta K. Schum (grains of paradise, Zingiberaceae) are used as a common spice in African countries and a fine condiment in the European cuisine. In this study, we evaluated the phytochemical profile of various seed extracts of A. melegueta as well as their antimicrobial, antioxidant and enzyme inhibitory effects. In total, 25 diarylheptanoids, five gingerol derivatives and nine phenolic/organic acids were tentatively annotated in A. melegueta by liquid chromatography hyphenated with high resolution tandem mass spectrometry (LC-HRMS/MS). A. melegueta showed a moderate inhibitory activity against different human pathogenic microbial strains, with H. pylori the most sensitive microorganism. A strong antioxidant and enzyme inhibitory potential was shown in various radical scavenging, reducing and chelating assays as well as in cholinesterase, tyrosinase and glucosidase assays. Several specialized metabolites from A. melegueta (diarylheptanoids, gingerols) were shown to be directly linked with the investigated antioxidant and enzyme inhibitory activities, as evaluated through the correlation analysis. In addition, two diarylheptanoids (one heptan-3-ol and one heptan- 3,5-diol) displayed the strongest binding to acetylcholinesterase (AchE) via multiple H-bonds, a couple of π-π interactions and van der Waals interactions all over the catalytic ch.nnel of the enzyme, as evidenced by the molecular docking study. Overall, our work brings new contributions to the phyto-complexity and poly-pharmacology of spices from genus Aframomum than can find future applications in pharmaceutical, nutraceutical or cosmeceutical industry.

关键词： Aframomum melegueta Zingiberaceae Spices Gingerols Helicobacter

C-axis Oriented AIn Thin Films on Silicon Prepared by Ultrahigh Vacuum Evaporation of AI Combined with Post-nitridation

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ch.nese Physics Letters 1998年第10期15卷 732-733页

作者： HUAnG Ji-po WAnG Lian-wei SHEn Qin-wo GAO Jian-xia nI Ru-shan LIn ch.ng-lu State Key Laboratory of Functional Materials for Informatics Shanghai Institute of MetallurgyChinese Academy of SciencesShanghai200050

A new technique for the preparation of Aln thin films by ultrahigh vacuum electron beam evaporation of AI followed by nitridation is reported and by using this method c-axis oriented AJn thin films have been success-fully grown on Si(111)substrates.X-ray diffraction,Fourier transform infrared spectroscopy,x-ray photoelectron spectroscopy and cross-sectional transmission electron microscope were employed to characterize AIn *** of nitridation was found to play an important role in the formation of AIn *** post-nitridation of as-deposited film at 1000℃ for lh in n2,the crystalline Aln film with(002)orientation has been obtained.

关键词： Si(111) film sectional

具有外部干扰的不确定广义系统有限时间鲁棒控制

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南京理工大学学报 2018年第5期42卷 578-585页

作者：李博沃松林江苏理工学院电气信息工程学院江苏常州213001

研究具有外部干扰的不确定连续广义系统的有限时间鲁棒镇定问题,系统的状态和输入矩阵不确定性是时不变且模有界的,通过设计系统的状态反馈控制器,使对所有允许的不确定性,闭环系统均为正则、脉冲自由且有限时间有界。采用线性矩阵不等... 详细信息

研究具有外部干扰的不确定连续广义系统的有限时间鲁棒镇定问题,系统的状态和输入矩阵不确定性是时不变且模有界的,通过设计系统的状态反馈控制器,使对所有允许的不确定性,闭环系统均为正则、脉冲自由且有限时间有界。采用线性矩阵不等式方法,对具有外部干扰的不确定连续广义系统的有限时间鲁棒有界和状态反馈控制器鲁棒镇定进行了分析,给出了有限时间鲁棒控制器的设计方法。仿真例子验证了所给方法的有效性。

关键词：不确定广义系统有限时间鲁棒有界状态反馈有限时间鲁棒镇定外部干扰

环-块摩擦副条件下纳米二硫化钼的摩擦学性能

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润滑与密封 2006年第2期31卷 108-109,112页

作者：沃恒洲胡献国陈刚解放军炮兵学院安徽合肥230031 合肥工业大学安徽合肥230009

由硫化钠和钼酸钠水溶液反应生成三硫化钼沉淀，将三硫化钼脱硫，制得了粒径为20-30nm的纳米MoS2颗粒。利用MM-200摩擦磨损实验机测定了纳米MoS2作为n46机械油添加剂的摩擦学性能。结果表明，纳米二硫化钼比普通二硫化钼具有更好的抗磨... 详细信息

由硫化钠和钼酸钠水溶液反应生成三硫化钼沉淀，将三硫化钼脱硫，制得了粒径为20-30nm的纳米MoS2颗粒。利用MM-200摩擦磨损实验机测定了纳米MoS2作为n46机械油添加剂的摩擦学性能。结果表明，纳米二硫化钼比普通二硫化钼具有更好的抗磨性能。其机制为纳米二硫化钼比普通二硫化钼更容易发生摩擦化学反应，形成了富含硫和钼的润滑膜，而起抗磨作用。

关键词： MoS2 纳米颗粒摩擦学特性

Frustrated Magnetic Interactions and Quenched Spin Fluctuations in CrAs

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ch.nese Physics Letters 2022年第12期39卷 89-93页

作者： Yayuan Qin Yao Shen Yiqing Hao Hongliang wo Shoudong Shen Russell A.Ewings Yang Zhao Leland W.Harriger Jeffrey W.Lynn Jun Zhao State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433China Shanghai Qizhi Institute Shanghai 200232China ISIS Pulsed neutron and Muon Source STFC Rutherford Appleton LaboratoryHarwell CampusDidcotOxonOX110QXUnited Kingdom nIST Center for neutron Research National Institute of Standards and TechnologyGaithersburgMD 20899USA Department of Materials Science and Engineering University of MarylandCollege ParkMD 20742USA Institute of nanoelectronics and Quantum Computing Fudan UniversityShanghai 200433China Shanghai Research Center for Quantum Sciences Shanghai 201315China

The discovery of pressure-induced superconductivity in helimagnets(CrAs,MnP)has attracted considerable interest in understanding the relationship between complex magnetism and unconventional ***,the nature of the magnetism and magnetic interactions that drive the unusual double-helical magnetic order in these materials remains ***,we report neutron scattering measurements of magnetic excitations in CrAs single crystals at ambient *** experiments reveal well defined spin wave excitations up to about 150 meV with a pseudogap below 7 meV,which can be effectively described by the Heisenberg model with nearest neighbor exch.nge *** surprisingly,the spin excitations are largely quenched above the néel temperature,in contrast to cuprates and iron pnictides where the spectral weight is mostly preserved in the paramagnetic *** results suggest that the helimagnetic order is driven by strongly frustrated exch.nge interactions,and that CrAs is at the verge of itinerant and correlation-induced localized states,which is therefore highly pressure-tunable and favorable for superconductivity.

关键词： excitation exch.nge pressure

Amorphous wo_(3-x)thin films with color characteristics tuned by the oxygen vacancies created during reactive DC sputtering

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Journal of Materials Science & Technology 2021年第19期78卷 223-228页

作者： C.Guillén J.Herrero Departamento de Energia(CIEMAT) Avda.Complutense 40.28040 MadridSpain

Tungsten oxides are interesting for a variety of applications due to their versatile optoelectronic characteristics,which can be tuned ch.nging the composition and/or the crystalline *** due to sub-bandgap absorption is often achieved by ion intercalation or doping in wo_(3):M films(with M=H^(+),Li^(+),na^(+),*** extra electrons),but a more direct way is creating charged oxygen vacancies(V_O^(+)and/or V_O~(2+))in sub-stoichiometric wo_(3-x)***,amorphous wo_(3-x)thin films are obtained by reactive DC sputtering of a pure W target,on unheated glass substrates,ch.nging the oxygen to argon pressures *** control of intrinsic defects(oxygen vacancies and tungsten valence states)by the oxygen partial pressure allows tuning the morphology,sub-bandgap absorption and carrier density in these wo_(3-x)films,as it is proven by Raman spectroscopy,atomic force microscopy,optical spectrophotometry and Hall effect measurements.

关键词： Metal oxide Stoichiometry Optical absorption Electrical conductivity