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554 results on '"Wang, Zhuan"'

233. Effect of lapping slurry on critical cutting depth of spinel.

Author

Wang, Zhan-kui, Wang, Zhuan-kui, Zhu, Yong-wei, and Su, Jian-xiu

Subjects
*GRINDING & polishing, *SLURRY, *CUTTING (Materials), *SPINEL, *SURFACE cracks, *X-ray photoelectron spectroscopy
Abstract

The critical cutting depth for lapping process is very important because it influences the mode of material removal. In this paper, a serial of microscopic indentation experiments were carried out for measuring spinel wafers’ hardness and crack length in different lapping slurries. Their critical cutting depth and fracture toughness were calculated. X-ray photoelectron spectroscopy (XPS) was also employed to study the surface chemical composition and softened layer thickness of wafers in different slurries. Experimental results indicate that the softened layers of spinel wafers are formed due to the corrosion of lapping slurries, which leads to a lower hardness and a larger fracture toughness of samples, and increases the critical cutting depth. Among them, the critical cutting depth in ethylene glycol solution is the largest and up to 21.8 nm. The increase of critical cutting depth is helpful to modify the surface quality of the work-piece being lapped via ductile removal mode instead of brittle fracture mode. [ABSTRACT FROM AUTHOR]

Published
2015
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234. A note on eigenvalues of perturbed 2x2 block Hermitian matrices.

Author

Cheng, Guang-Hui, Tan, Qin, and Wang, Zhuan-De

Subjects
EIGENVALUES, PERTURBATION theory, HERMITIAN forms, MATRICES (Mathematics), EIGENVECTORS
Abstract

Letbe two Hermitian matrices. We propose new perturbation bounds on the differences between the eigenvalues ofandby the bounds of the eigenvector components. These results extend those of Nakatsukasa. [ABSTRACT FROM AUTHOR]

Published
2015
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235. Tunable biphasic drug release from ethyl cellulose nanofibers fabricated using a modified coaxial electrospinning process.

Author

Li, Chen, Wang, Zhuan-Hua, Yu, Deng-Guang, and Williams, Gareth

Subjects
CONTROLLED release drugs, ETHYLCELLULOSE, NANOFIBERS, QUERCETIN, MICROFABRICATION, ELECTROSPINNING, X-ray diffraction, THERAPEUTICS
Abstract

This manuscript reports a new type of drug-loaded core-shell nanofibers that provide tunable biphasic release of quercetin. The nanofibers were fabricated using a modified coaxial electrospinning process, in which a polyvinyl chloride (PVC)-coated concentric spinneret was employed. Poly (vinyl pyrrolidone) (PVP) and ethyl cellulose (EC) were used as the polymer matrices to form the shell and core parts of the nanofibers, respectively. Scanning and transmission electron microscopy demonstrated that the nanofibers had linear morphologies and core-shell structures. The quercetin was found to be present in the nanofibers in the amorphous physical status, on the basis of X-ray diffraction results. In vitro release profiles showed that the PVP shell very rapidly freed its drug cargo into the solution, while the EC core provided the succedent sustained release. Variation of the drug loading permitted the release profiles to be tuned. [ABSTRACT FROM AUTHOR]

Published
2014
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244. Spectroscopy of Raman-shifted solitons in photonic-crystal fibers

Author

Serebryannikov, E. E., primary, Hu, Ming-Lie, additional, Wang, Ching-Yue, additional, Li, Yan-Feng, additional, Wang, Zhuan, additional, Chai, Lu, additional, Ren, Xiaomin, additional, Dukel'skii, K. V., additional, Khokhlov, A. V., additional, Shevandin, V. S., additional, Kondrat'ev, Yu. N., additional, and Zheltikov, A. M., additional

Published
2006
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247. Planning & its application of distribution center based on order data analysis

Author

HE Wenwen and Wang Zhuan

Subjects
Distribution center, Engineering, Operations research, business.industry, Process (engineering), Applied Mathematics, Mechanical Engineering, Business system planning, Rational planning model, Computer Science Applications, Unit (housing), Capacity planning, Order (exchange), Needs analysis, business
Abstract

Modern distribution center is a complex logistics system, which is composed of many storage zones and picking zones, and includes many operation patterns with different equipments. Its scientific and rational planning and design are very important to build an efficient distribution center. The needs analysis, capacity planning and the detailed planning syllogism distribution center system planning methodology,the capacity planning model based on the orders data analysis and the equipment allocation model based on storage and picking pattern model are put forward, after doing long-term research on distribution center system planning. The basic storage unit design, the overall capacity planning, storage area planning, process flow designing, and storage area capacity planning based on EIQ-PCB etc are expounded. Finally the application of the methodology in medicine distribution center system planning is introduced.

Published
2007

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