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Structural stability of single-layered LaNi_4.25Al_0.75 film and its electro-chemical hydrogen-storage properties

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Rare Metals 2006年第5期25卷 543-548页

作者： WANG Zhongmin chi ying Vanessa Li ZHOU Huaiying Sammy Lap ip Chan SHI Liu Center of Material Science and Engineering Guilin University of Electronic Technology Guilin 541004 China School of Materials Science and Engineering University of New Sooth Wales Sydney NSW 2052 Australia Institute of Metal Research Chinese Academy of Sciences China

AB5-based hydrogen storage thin fdms （LaNi4.25Al0.75）, deposited on Cu substrate by dc magnetron sputtering were investigated in this study. X-ray diffraction （XRD） revealed that the microstructure of the layer was in crystal form. SEM and AFM analyses proved that the film appeared to be rather rough with numerous randomly sized pores of approximately 15-40 in nm diameter. Structural stability of the film was examined by the combined analyses of DSC, XRD, and SEM, which indicated that this film maintained its structural stability below 500 K or so, and a network structure was observed on the film after being heated at 700 K for 30 min. Electrochemical hydrogen-storage properties of the films were investigated by simulated battery tests. It was found that single-layered LaNi4.25A10.75 film exhibited electrochemical hydrogen-storage properties similar to typical AB5 alloys in bulk, and the maximum discharge capacity of the film was about 220 mAh/g. After 20 charge/discharge cycles, small needle-shaped aluminium oxide was formed on some fractions of the film surface.

关键词： hydrogen storage thin film magnetron sputtering structural stability electrochemical properties

Versatile guardians: regenerative regulatory T cells in Parkinson’s disease rodent models

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Signal Transduction and Targeted Therapy 2023年第12期8卷 5578-5580页

作者： chi Wang ip Jörg Wischhusen Department of Neurology University Hospital of WürzburgWürzburgGermany Section for Experimental Tumor Immunology Department of Obstetrics and GynecologyUniversity Hospital of WürzburgWürzburgGermany

In a paper published in Nature,Park and colleagues have explored an innovative approach for improving adoptive neuron transfer,with possible implications for Parkinson´s Disease(PD)and other neurodegenerative diseases.1 By co-transplanting autologous regulatory T(Treg)cells,they managed to reduce surgical trauma-induced neuroinflammation,enhance the safety of cell replacement therapy by inhibiting proliferation of non-dopaminergic cells and improve therapeutic outcomes.

关键词： inflammation inhibiting trauma

Detection of large color variation in the potentially hazardous asteroid(297274) 1996 SK

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Research in Astronomy and Astrophysics 2014年第3期14卷 311-318页

作者： chien-Hsien Lin Wing-Huen ip Zhong-Yi Lin Fumi Yoshida Yu-chi Cheng Space Science Institute Macao University of Science and Technology Institute of Astronomy National Central University National Astronomical Observatory Osawa MitakaTokyo

Low-inclination near-earth asteroid （NEA）（297274） 1996 SK, which isalso classified as a potentially hazardous asteroid, has a highly eccentric orbit. Itwas studied by multi-wavelength photometry within the framework of an NEA colorsurvey at Lulin Observatory. Here, we report the finding of large color variationacross the surface of （297274） 1996 SK within one asteroidal rotation period of4.656 ± 0.122 hours and classify it as an S-type asteroid according to its averagecolors ofB - V = 0.767 ± 0.033, V - R = 0.482 ± 0.021, V - I = 0.801 ± 0.025and the corresponding relative reflectance spectrum. These results might be indica-tive of differential space weathering or compositional inhomogeneity in the surfacematerials.

关键词： minor planets, asteroids: individual: PHA (297274) techniques: photometric

Testing heteroscedasticity by wavelets in a nonparametric regression model

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Science china Mathematics 2006年第9期49卷 1211-1222页

作者： ip Waicheung Department of Applied Mathematics Hong Kong Polytechnic UniversityHong KongChina

In the nonparametric regression models, a homoscedastic structure is usually assumed. However, the homoscedasticity cannot be guaranteed a priori. Hence, testing the heteroscedasticity is needed. In this paper we propose a consistent nonparametric test for heteroscedasticity, based on wavelets. The empirical wavelet coefficients of the conditional variance in a regression model are defined first. Then they are shown to be asymptotically normal, based on which a test statistic for the heteroscedasticity is constructed by using Fan's wavelet thresholding idea. Simulations show that our test is superior to the traditional nonparametric test.

关键词： regression model, heteroscedasticity, significance test, wavelets.

Non-linear dynamic state-space network modeling for decoding neurodegeneration

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Neural Regeneration Research 2024年第9期19卷 1879-1880页

作者： Venkata C.chirumamilla chi Wang ip Martin Reich Robert Peach Jens Volkmann Bahman Nasseroleslami Muthuraman Muthuraman Prenatal Pediatrics Institute Children’s National HospitalWashingtonDCUSA Neural Engineering with Signal Analytics and Artificial Intelligence Department of NeurologyUniversity of WürzburgWürzburgGermany Academic Unit of Neurology Trinity Biomedical Sciences InstituteTrinity College DublinUniversity of DublinDublinIreland

Neurodegenerative disorders represent a pervasive global health challenge,yet therapeutic options remain conspicuously *** disorders are inherently dynamic processes within the central nervous system,unfolding across distinct sub-stages:initial structural neuronal alterations(sub-stage 1),functional impairment(sub-stage 2),and culminating in neuronal death(sub-stage 3).

关键词： alterations impairment dynamic

Testing coeffcients of AR and bilinear time series models by a graphical approach

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Science china Mathematics 2008年第12期51卷 2304-2314页

作者： ip WaiCheung Department of Mathematics The Hong Kong Polytechnic University

AR and bilinear time series models are expressed as time series chain graphical models, based on which, it is shown that the coefficients of AR and bilinear models are the conditional correlation coefficients conditioned on the other components of the time series. Then a graphically based procedure is proposed to test the significance of the coeffcients of AR and bilinear time series. Simulations show that our procedure performs well both in sizes and powers.

关键词： AR model bilinear model graphical model

Photometry of δ Sct-type and Related Stars: Results of AD Ari, ip Vir and YZ Boo

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chinese Journal of Astronomy and Astrophysics 2002年第1期2卷 43-50页

作者： Ai-ying Zhou National Astronomical Observatories Chinese Academy of SciencesBeijing 100012

Photometric results of three δ Scuti stars, AD Ari, ip Vir and YZ Boo from new observations obtained at the:Xinglong Station of the Beijing Astronom- ical Observatory (BAO) during 2000 aELd 2001 are reported. We present here the preliminary analyses. Detailed studies of these stars based on additional data will be published separately.

关键词： stars:variables:δ Scuti - stars: individual:AD Ari ip Vir YZ Boo - techniques:photometric

ON PROBLEMS OF FRACTURE OF MATERIALS IN COMPRESSION ALONG TWO INTERNAL PARALLEL CRACKS

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Applied Mathematics and Mechanics(English Edition) 1997年第6期18卷 517-528页

作者： Guz, AN Nazarenko, VM Starodubtsev, ip Natl Acad Sci Ukraine Inst Mech UA-252057 Kiev Ukraine

The fracture of materials under the action of compressive forces, directed along cracks which are parallel in plane can,lot be described within the framework of the linear fracture mechanics. The criteria of fracture of the Griffith-Irvin or COC type, used in classical linear fracture mechanics, are not applicable in this problem, since these forces have no influence on stress intensity coefficients and on values of cracks opening([1, 2]). The problems of such a class may be described only by using new approaches. One of possible approaches is presented by the first author, which involves using linearized relations, derived from exact non-linear equations of deformable solid body mechanics([3, 4, 5]). It should be remarked here that this approach has been widely used in problems of deformable bodies stability. As a criterion of the initiation of fracture the criterion of local instability near defects of the crack type is used. In these cases the process of loss of stability initiates the fracture process.

关键词： fracture internal parallel crack criterion of the initiation of fracture

Isolated penile urethral injury:A rare case following male coital trauma

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Asian Journal of Urology 2015年第3期2卷 175-178页

作者： Ka Wing Wong Brian Sze Ho Ho chi Ho ip Ming Kwong Yiu Division of Urology Department of SurgeryUniversity of Hong KongPokfulamHong KongChina

Penile fractures are an uncommon urological ***,penile fractures involve the corpus cavernosum and are sometimes associated with urethral *** corpus spongiosum and urethral injuries without concomitant corpus cavernosum injury are,however,*** proper knowledge of the management of penile fractures and urethral injuries,this distinct entity can be diagnosed,assessed and managed successfully without complications.

关键词： Penile fracture Urethral injury Penis Corpus spongiosum Urological trauma Urethroplasty