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New Alkaloids from the Rhizomes of Goniothalamus Griffithii

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Chinese Chemical Letters 1998年第11期9卷 0-0,0-0页

作者： Zhang Y.J. kong M. Chen R.Y. Yu D.q. Institute of Materia Medica Chinese Academy of Medical Sciences Peking Union Medical College Beijing 100050 China

Three new alkaloids, griffithdionc 1, griffiazanone A 2 and griffiazanone B 3 were isolated from the rhizomes of Goniothalamus griffithii Hook. F. el. Thoms. Their structures were elucidated by analysis the spectral data (IR, UV, MS, 1 H and 13C NMR, HMBC, NOE experiment).The absolute configuration of griffithazanone A 2 was determined by Mosher's methods.

关键词： Goniothalamus griffithii phenanthrene lactam alkaloids griffithdione griffiazadioneA and griffiazadione B

Tailored architecture of composite electrolyte for all-solid-state sodium batteries with superior rate performance and cycle life

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Nano Research 2024年第5期17卷 4171-4180页

作者： Xiang Guan Zhenhua Jian Xingan Liao Wenchao Liao Yanfei Huang Dazhu Chen Robert k.Y.Li Chen Liu Shenzhen key Laboratory of Polymer Science and Technology Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518055China Department of Materials Science and Engineering City University of Hong KongHong KongChina

Seeking for composite electrolytes reinforced all-solid-state sodium ion batteries with superior long lifespan and rate performance remains a great ***,a unique strategy to tailor the architecture of composite electrolyte via inserting polymer chains into a small quantity of sulfate sodium grafted C_(48)0H_(28)O_(32)Zr_(6)(UIOSNa)is *** intimate contact between polymer segments and UIOSNa with limited pore size facilitates the anion immobilization of sodium salts and reduction of polymer crystallinity,thereby providing rapid ion conduction and reducing the adverse effect caused by the immigration of *** tNa+grafting of-SO_(3)Na groups on fillers allows the free movement of more sodium ions to further improve and ionic ***,even with the low content of UIOSNa fillers,a high ionic conductivity of 6.62×10^(-4) S·cm^(-1) at 60℃ and a transference number of 0.67 for the special designed composite electrolyte are *** assembled all-solid-state sodium cell exhibits a remarkable rate performance for 500 cycles with 95.96%capacity retention at a high current rate of 4 *** corresponding pouch cell can stably work for 1000 cycles with 97.03%capacity retention at 1 C,which is superior to most of the reported composite electrolytes in the literature.

关键词： solid state sodium battery composite electrolyte rate performance cycle life

First-principles Investigation of Bi Segregation at the Solder Interface of Cu/Cu_3Sn(010)

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Journal of Materials Science & Technology 2010年第12期26卷 1057-1062页

作者： X.Y. Pang Z.q. Liu S.q. Wang J.k. Shang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Department of Materials Science and Engineering University of Illinois at Urbana-Champaign IL 61801 USA

Density functional theory was employed to investigate the bismuth segregation at Cu/Cu3Sn（010） interface. Five initial constructions were introduced by adopting the adhesion energy criterion. Among them, the so-called ＂between-Cu＂ construction in which the interface Cu atoms of Cu slab locate along Cu-Cu bond direction in Cu3Sn slab was found to be the most energy-favored at an adhesion energy of 1.96 J/m^2. Based on this construction, five possible segregation sites were examined, and the most likely segregation site was determined with adhesion energy as low as 1.06 J/m^2, which was almost half of the initial one. Comparing with other sitest adhesion energies, it was concluded that size effect took a large part in embrittlement. The analyses of atomic structure and electronic density revealed that the slabs shifted away from interfaces due to bismuth segregation, and the atoms around Bi atom were Dressed away. This calculated work agreed aualitativelv with reported experimental results.

关键词： First-principles calculation Segregation Bismuth Interface SnBi solder

三维波纹板冲击/发散冷却结构流动及换热特性的数值研究

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工程热物理学报 2024年第1期45卷 212-222页

作者：李国栋郭涛马钊刘存良孔德海西北工业大学动力与能源学院西安710129 中国航发四川燃气涡轮研究院成都610500

为了进一步提升冲击冷却的强化换热潜力,在典型冲击/发散结构的基础上提出了一种冲击板为三维波纹板的冲击/发散冷却结构。三维波纹板由横向(X)及纵向(Y)的正弦波系叠加而成,冲击孔布置在正弦波的波谷位置。通过基于雷诺时均N-S方程的Re... 详细信息

为了进一步提升冲击冷却的强化换热潜力,在典型冲击/发散结构的基础上提出了一种冲击板为三维波纹板的冲击/发散冷却结构。三维波纹板由横向(X)及纵向(Y)的正弦波系叠加而成,冲击孔布置在正弦波的波谷位置。通过基于雷诺时均N-S方程的Realizable k-ε湍流模型进行了冲击/发散结构的数值模拟,对比了平板结构与三维波纹板结构在射流流动及靶面换热特性上的差异并研究了波纹板波幅(A/d)的影响规律。其中基于冲击孔直径d定义的射流雷诺数的研究范围为Red=300~3000,波纹板波幅的研究范围为A/d=0.5~1.1,冲击孔的横向间距、纵向间距及冲击距分别为S/d=10.0,P/d=5.0,H/d=3.0。结果表明:与实验结果相比,Realizable k-ε湍流模型能够对线平均及面平均努塞尔数(NuAve,^(—)Nu)给出准确的预测;三维波纹板结构相比平板结构降低了射流冲击靶面前的动量损失,显著提高了驻点附近的换热强度,当A/d=0.8时,距冲击驻点1.5d范围内NuAve的最大增幅为32.3%;随着A/d的增大,冲击驻点区的换热得到明显强化,但驻点区以外的换热基本不发生改变。改变A/d对^(—)Nu的增益效果受到Red的影响,在A/d=1.1时,Red由300增大到3000对应的^(—)Nu增幅由36.6%降低为11.6%;随着Red和A/d的增大,流量系数(Cd)逐渐增大,三维波纹板结构的流量系数大于平板结构,但增幅小于3%。

关键词：矢量喷管冲击发散冷却三维波纹板流动及换热特性数值模拟

Principle and Process Window of Cerium Dioxide Thin Film Fabrication with Dual Plasma Deposition

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Journal of Materials Science & Technology 2001年第1期17卷 29-30页

作者： L.P. Wang B. Y Tang X.B. Tian YX.Leng q. YZhang and P.k.Chu Department of Physics and Materials Science, City University of Hong kong, 83 Tat Chee Avenue, kowloon, Hong kong, China Dep. of Phys. City Univ. of Hong Kong 83 Chee Avenue Kowloon Hong Kong Hong Kong

Cerium dioxide, CeO2, is a potentially superior material in a myriad of areas, and many methods have been proposed to deposit single crystal CeO2 thin films. A novel fabrication technique utilizing dual plasma generated by metal vacuum arc (MEVVA) and radio frequency (RF) is discussed in this paper. We have recently conducted a systematic investigation to determine the optimal process window to deposit CeO2 thin films'on Si(100) substrates. The X-ray diffraction results show the existence of CeO2(100) in the as-deposited sample.

关键词： Thin Window Principle and Process Window of Cerium Dioxide Thin Film Fabrication with Dual Plasma Deposition

Congenital heart“Challenges”in Down syndrome

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World Journal of Cardiology 2024年第5期16卷 217-220页

作者： Maria Drakopoulou Panayotis k Vlachakis Costas Tsioufis Dimitris Tousoulis Department of First Cardiology Hippokration General HospitalAthens Medical SchoolNational and Kapodistrian University of AthensAthens 11527Greece

In this editorial,we comment on the article by kong et al published in the recent issue of the World Journal of *** this interesting case,the authors present the challenges faced in managing a 13-year-old patient with Down syndrome(DS)and congenital heart disease(CHD)associated with pulmonary arterial *** this distinct population,the Authors underscore the need for early diagnosis and management as well as the need of a multidisciplinary approach for decision *** seems that the occurrence of CHD in patients with DS adds layers of complexity to their clinical *** editorial aims to provide a comprehensive overview of the intricate interplay between DS and congenital heart disorders,offering insights into the nuanced diagnostic and therapeutic considerations for physicians.

关键词： Down syndrome Congenital heart disease Atrioventricular septal defect Pulmonary hypertension Right heart catheterization

Compression of Battery X-Ray Tomography Data with Machine Learning

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Chinese Physics Letters 2024年第9期41卷 153-158页

作者： Zipei Yan qiyu Wang Xiqian Yu Jizhou Li Michael k.-P.Ng Department of Electronic Engineering The Chinese University of Hong KongHong KongChina Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Huairou Division Institute of PhysicsChinese Academy of SciencesBeijing 101400China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China CUHk Shenzhen Research Institute Shenzhen 518057China Department of Mathematics Hong Kong Baptist UniversityHong KongChina

With the increasing demand for high-resolution x-ray tomography in battery characterization,the challenges of storing,transmitting,and analyzing substantial imaging data necessitate more efficient *** data compression methods struggle to balance reduction ratio and image quality,often failing to preserve critical details for accurate *** study proposes a machine learning-assisted compression method tailored for battery x-ray imaging *** physics-informed representation learning,our approach significantly reduces file sizes without sacrificing meaningful *** validate the method on typical battery materials and different x-ray imaging techniques,demonstrating its effectiveness in preserving structural and chemical *** results show an up-to-95 compression ratio while maintaining high fidelity in the projection and reconstructed *** proposed framework provides a promising solution for managing large-scale battery x-ray imaging datasets,facilitating significant advancements in battery research and development.

关键词： battery Battery details

Ab initio valence-space in-medium similarity renormalization group calculations for neutron-rich P,Cl,and k isotopes

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Chinese Physics C 2024年第7期48卷 181-190页

作者：谢萌冉沈留媛李健国李红蕙袁琪左维 Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

Neutron-rich P,Cl,and k isotopes,particularly those with neutron numbers of approximately N=28,have attracted extensive experimental and theoretical *** utilize the ab initio valence-space in-medium similarity renormalization group approach,based on chiral nucleon-nucleon and three-nucleon forces,to investigate the exotic properties of these *** calculations of the low-lying spectra are performed.A key finding is the level inversion between 3/2_(1)^(+)and 1/2_(1)^(+)states in odd-A isotopes,attributed to the inversion ofπ0xod_(3/2) andπls_(1/2) single-particle *** ab initio calculations,which incorporate the three-nucleon forces,correlate closely with existing experimental *** calculations of effective proton single-particle energies provide deeper insights into the shell evolution for Z=14 and 16 *** results indicate that the three-body force plays important roles in the shell evolution for Z=14 and 16 sub-shells with neutron numbers ranging from 20 to ***,systematic ab initio calculations are conducted for the low-lying spectra of odd-odd *** results correspond with experimental data and provide new insights for future research into these isotopes up to and beyond the drip line.

关键词： ab initio calculations shell evolution low-lying spectra

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戊聚糖对面包品质和贮存性质的影响

食品科技 2024年第7期49卷 156-162页

作者：孙小凡刘佳慧孔峰聊城大学农学与农业工程学院山东聊城252000

文章研究不同戊聚糖添加量对面包物理性质、感官品质和贮存性质的影响。将0%~0.9%不同量的戊聚糖添加到小麦面粉中制作面包,考察不同戊聚糖添加量以及贮存时间对面包比容、水分含量、酸度、质构特性、感官品质的影响。结果表明,在面包... 详细信息

文章研究不同戊聚糖添加量对面包物理性质、感官品质和贮存性质的影响。将0%~0.9%不同量的戊聚糖添加到小麦面粉中制作面包,考察不同戊聚糖添加量以及贮存时间对面包比容、水分含量、酸度、质构特性、感官品质的影响。结果表明,在面包中加入适量的戊聚糖,可使面包的体积、含水量、酸度、弹性和感官评分增大,而硬度减小。戊聚糖最适添加量为0.1%,相比于对照组,面包的比容、弹性和感官评分分别提高了16.28%、5.21%和12.66%,硬度降低了22.56%。在贮存期间,添加0.1%和0.3%戊聚糖的面包感官品质指标整体呈现先增大后减小的趋势。适量添加戊聚糖维持和改善了面包的贮存稳定性,其中添加0.1%戊聚糖贮存品质最好。适量添加戊聚糖有利于改善面包的物理性质、感官品质和贮存性能,可以为面制品的加工和保藏提供指导。

关键词：戊聚糖面包品质贮藏性质感官评价