85 Result(s)

Article

Effect of microstructural coarsening on Hertzian contact damage in silicon nitride

The critical role of grain size in determining the nature of damage accumulation in silicon-nitride ceramics is evaluated using Hertzian contact testing. Single-cycle tests are conducted on materials of two gr...

Hockin H. K. Xu, Lanhua Wei, Nitin P. Padture, B. R. Lawn… in Journal of Materials Science (1995)

Article

Heat conduction in silicon thin films: Effect of microstructure

A study was made of the thermal properties of low pressure chemical vapor deposition (LPCVD) silicon thin films with amorphous and polycrystalline microstructures, produced by varying the substrate temperature...

Lanhua Wei, Mark Vaudin, Cheol Song Hwang, Grady White… in Journal of Materials Research (1995)

Article

Damage accumulation and cyclic fatigue in Mg-PSZ at Hertzian contacts

Hertzian contact damage in as-fired, peak-aged, and over-aged Mg-PSZ is studied, in single-cycle and multiple-cycle loading. Indentation stress-strain curves reveal a monotonically increasing quasi-plasticity ...

Antonia Pajares, Lanhua Wei, Brian R. Lawn… in Journal of Materials Research (1995)

Article

Grinding force and microcrack density in abrasive machining of silicon nitride

The relationship between grinding forces and the material’s resistance to microfracture is investigated in abrasive machining of silicon nitride ceramics. Surface grinding is performed on two forms of silicon ...

Hockin H. K. Xu, Lanhua Wei, Said Jahanmir in Journal of Materials Research (1995)

Article

Thermal wave analysis of contact damage in ceramics: Case study on alumina

Thermal waves are used to image damage accumulation digitally beneath Hertzian contacts in ceramics. Alumina ceramics over a range of grain size 3–48 μm are used in a case study. The nature of the images changes ...

Lanhua Wei, Brian R. Lawn in Journal of Materials Research (1996)

Article

Effect of mechanical damage on thermal conduction of plasma-sprayed coatings

A thermal wave methodology for monitoring the thermal conduction of ceramic coatings with accumulating mechanical damage is described. Tests are conducted on a model alumina coating containing laminar defect i...

Lanhua Wei, Antonia Pajares, Brian R. Lawn in Journal of Materials Research (1996)

Article

Thermal diffusivity maps: Case studies in ceramics

A new methodology for map** thermal diffusivity using a photothermal deflection method is introduced. Two case studies are made: fiber-reinforced composite structures and contact damage zones in alumina. In ...

Lanhua Wei, Grady S. White in Journal of Materials Research (1997)

Article

Organic geochemical studies of sinking particulate material in China sea area II

We have for the first time studied the compositions of ketone, aldehyde and alcohol lipid compounds in sinking particulate materials from Yongshu Reef lagoon and the continental shelf of the East China Sea col...

Yi Duan, Mingzhong Cui, Lanhua Ma, **ming Song, Shixin Zhou… in Chinese Science Bulletin (1997)

Article

Effects of microstructural evolution on the thermal conductivity of α–Al₂O₃ prepared from nano-size γ–Al₂O₃ powder

The thermal diffusivities (D) of porous α–Al₂O₃ specimens prepared from nano-size γ–Al₂O₃ powder and from conventional submicrometer-size alumina powders were measured at room temperature, and the thermal conduct...

Eduardo J. Gonzalez, Grady White, Lanhua Wei in Journal of Materials Research (2000)

Article

Research of the entry of rare earth elements Eu³⁺ and La³⁺ into plant cell

Whether rare earth elements can enter into plant cells remains controversial. This article discusses the ultracellular structural localization of lanthanum (La³⁺) and europium (Eu³⁺) in the intact plant cells fed...

Yongsheng Gao, Fuli Zeng, An Yi, Shi **, Lanhua **g in Biological Trace Element Research (2003)

Article

Synthesis and anion recognition of neutral receptors based on multiamide calix[4]arene

Two multiamide calix[4]arenes (5, 6) were synthesized and characterized by NMR, MS and elemental analysis. The binding properties of receptors with some anions (π-O₂NPhOPO ₃ ²⁻

Shunying Liu, Fajun Wang, Lanhua Wei, Wang **ao… in Science in China Series B: Chemistry (2004)

Article

Synthesis and aggregation behavior of N-succinyl-o-carboxymethylchitosan in aqueous solutions

A simple and novel method was developed to successfully synthesize N-succinyl-O-carboxymethylchitosan (NSOCMCS) using N-acylation of chitosan with succinic anhydride. The NSOCMCS structure was characterized by Fo...

Ai** Zhu, Lanhua Yuan, Yan Lu in Colloid and Polymer Science (2007)

Article

Chemiluminescence method for the determination of mitoxantrone by the enhancement of the tris-(4,7-diphenyl-1,10-phenanthrolinedisulfonic acid)ruthenium(II)–cerium(IV) system

A new injection chemiluminescence system was used for the determination of mitoxantrone. The technique is based on the reduction effect of mitoxantrone on the tris-(4,7-diphenyl-1,10-phenanthrolinedisulfonic a...

Fengshan Yu, Lanhua Chen, Fang Chen in Microchimica Acta (2008)

Article

Sedimentary characteristics of paleo-aeolian dune sands of Salawusu Formation in the Salawusu River Valley

The Salawusu Formation of Milanggouwan section in Salawusu River Valley includes 7 layers of paleo-mobile dune sands, and 4 layers of paleo-fixed and semi-fixed dune sands. Their structures have been observed ...

**anjiao Ou, Baosheng Li, Heling **, Guangrong Dong… in Journal of Geographical Sciences (2008)

Article

Direct chemiluminescence determination of fenbufen by the enhancement of the \({\text{Ru}}\left( {{\text{phen}}} \right)_3^{2 + } \) –cerium(IV) system

A method is described for determination of fenbufen that is based on the chemiluminescence (CL) reaction of the $${\text{Ru}}\left( {{...

Fengshan Yu, Fang Chen, Lanhua Chen in Microchimica Acta (2008)

Article

Electrochemical determination diethylstilbestrol by a single-walled carbon nanotube/platinum nanoparticle composite film electrode

Platinum nanoparticles (Pt_nano) were prepared and used in combination with single-wall carbon nanotube (SWNT) for fabricating electrochemical sensors with remarkably improved sensitivity toward diethylstilbestrol...

Junjie Fei, **aoqin Wen, Lanhua Yi, Fang Ge… in Journal of Applied Electrochemistry (2008)

Article

Voltammetric determination of trace doxorubicin at a nano-titania/nafion composite film modified electrode in the presence of cetyltrimethylammonium bromide

A sensitive electrochemical method was developed for the determination of doxorubicin at a glassy carbon electrode (GCE) modified with a nano-titania (nano-TiO₂)/nafion composite film. Nano-TiO₂ was dispersed int...

Junjie Fei, **aoqin Wen, Ying Zhang, Lanhua Yi, **aoming Chen, Hui Cao in Microchimica Acta (2009)

Article

Reoperation for the Removal of Polyacrylamide Hydrogel in the Breast: Use of Periareolar Approach under Direct Visualization

DaLi Mu, Jie Luan, LanHua Mu, MinQiang **n in Aesthetic Plastic Surgery (2009)

Article

Preparation and performances of carbon aerogel microspheres for the application of supercapacitor

Carbon aerogel (CA) microspheres were successfully synthesized by an inverse emulsion polymerization routine. Morphology and physical properties of the CA microspheres were characterized by scanning electron m...

**ngyan Wang, Li Liu, **anyou Wang, Li Bai… in Journal of Solid State Electrochemistry (2011)