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Improvement of silicon etching resolution using the confined etchant layer technique

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Chinese Science Bulletin 1997年第15期42卷 1318-1319页

作者： Zu, YB Xie, L Tian, ZW Xie, ZX Mu, JQ mao, bw State Key Laboratory for Physical Chemistry of the Solid Surface Department of Chemistry Institute of Physical Chemistry Xiamen University Xiamen China

WHEN scanning electrochemical microscopy (SECM) with feedback mode is used to etchcertain surface, the etchant molecules generated at a microelectrode diffuse to the surface andreact therein with the surface species, resulting in local etching pattern. It is noted that theetching resolution of SECM is dominantly determined by the size of the ***, many experimental results have shown the significant influence of the lateral diffu-sion of etchant on the etching resolution. Therefore, a thin diffusion layer of the

关键词： As SECM Improvement of silicon etching resolution using the confined etchant layer technique CELT

A modified simplex method for multifactor optimization of selectivity in gas chromatography

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Chinese Journal of Chemistry 1995年第2期13卷 169-174页

作者： WANG, QS ZHU, CS YAN, bw NANKAI UNIV NATL LAB ELEMENTOORGAN CHEMTIANJIN 300071PEOPLES R CHINA

A computer-assisted advanced simplex method is presented for the simultaneous optimization of multifactor (stationary phase loading, carrier gas dow rate and column temperature) for separation of ten compounds in gas chromatography. A three factors factorial design was used. The method was based on a special polynomial established from fifteen preliminary runs, using resolution as the selection criterion, with connection to a general simplex method. Excellent agreement is found between the predicted data and the experimental results, and most of experiments required in the general simplex method can be omitted.

关键词： GAS CHROMATOGRAPHY STATIONARY PHASE CARRIER GAS FLOW RATE COLUMN TEMPERATURE MULTIFACTOR OPTIMIZATION

Advances in dye-sensitized solar cell

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Chinese Science Bulletin 1997年第23期42卷 1937-1948页

作者： Jing, bw Zhang, MH Shen, T Chinese Acad Sci Inst Photog Chem Beijing 100101 Peoples R China

THE conversion of visible light to electricity using semiconductors as light absorbers has beenan important area of research for many years. In the 1970s, highly efficient photovoltaiccells based on silicon were developed (the light-to-electrical conversion efficiency≥25%),which provides energy to aircrafts. Then semiconductor liquid-junction photoelectrochemicalcell started to be investigated. Generally speaking, highly efficient liquid-junction photoelec-trochemical solar cells can be obtained by using semiconductors such as Si, GaAs and WSe.(band gap≈(1.3±0.3) eV). Conversion efficiencies over 15% have been acquired on solarcells consisting of single crystals of Si or GaAs. But the serious photocorrosion and high

关键词： dye-sensitized solar cell ruthenium complex.

Management of urethral atrophy after implantation of artificial urinary sphincter:what are the weaknesses?

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Asian Journal of Andrology 2020年第1期22卷 60-63页

作者： Nathaniel H Heah Ronny bw Tan Department of Urology Tan Tock Seng Hospital308433 Singapore A dvanced Urology Mount Elizabeth Hospital228510 Singapore

The use of artificial urinary sphincter(AUS)for the treatment of stress urinary incontinence has become more prevalent,especially in the“prostate-specific antigen(PSA)-era”,when more patients are treated for localized prostate *** first widely accepted device was the AMS 800,but since then,other devices have also entered the *** efficacy has increased with improvements in technology and technique,and patient satisfaction is high,AUS implantation still has inherent risks and complications of any implant surgery,in addition to the unique challenges of urethral complications that may be associated with the ***,the unique nature of the AUS,with a control pump,reservoir,balloon cuff,and connecting tubing,means that mechanical complications can also arise from these individual *** article aims to present and summarize the current literature on the management of complications of AUS,especially urethral *** conducted a literature search on PubMed from January 1990 to December 2018 on AUS complications and their *** review the various potential complications and their *** complications are either mechanical or nonmechanical *** complications usually involve malfunction of the *** complications include infection,urethral atrophy,cuff erosion,and *** exist especially in the management of urethral atrophy,with both tandem implants,transcorporal cuffs,and cuff downsizing all postulated as potential *** complications from AUS implants are not common,knowledge of the management of these issues are crucial to ensure care for patients with these *** studies are needed to further evaluate these techniques.

关键词： artificial urinary sphincter artificial urinary sphincter complications tandem cuffs transcorporal cuffs urethral atrophy

Analytic EAM Model for the Thermodynamic Properties ofthe Disordered Solid Solution and Ordered Intermetallic Alloys of Iron Aluminides

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Journal of Materials Science & Technology 1999年第4期15卷 336-338页

作者： Hu, WY Zhang, bw Shu, XL Huang, BY Hunan Univ Dept Appl Phys Changsha 410082 Peoples R China Cent S Univ Technol Powder Met Res Inst Changsha 410083 Peoples R China

A simple analytic embedded atom method for bcc Fe and fee Al metals is used to calculate the thermodynamic properties of the disordered solid solution and ordered intermetallic alloys of Fe aluminides. The thermodynamic properties, such as the dilute-limit heats of solution, formation enthalpies of disordered solid solutions and intermetallic compounds (Fe3Al in the D0(3) structure type, FeAl in the B2 structure type, and Fe13Al3) are in good agreement with the experimental data, and with the results calculated using the first principles and Miedema theory.

关键词： Intermetallics

Enthalpies of Formation of Binary Transition hcp Metal Based Alloys Calculated by Analytic Embedded Atom Method Model

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Journal of Materials Science & Technology 1999年第4期15卷 331-335页

作者： Zhang, bw Ouyang, YF Liao, SZ Jin, ZP Chinese Acad Sci Int Ctr Mat Phys Shenyang 110015 Peoples R China Hunan Educ Inst Dept Phys Changsha 410012 Peoples R China Cent S Univ Technol Dept Mat Sci & Engn Changsha 410083 Peoples R China

A simple analytic modified embedded atom method (MEAM) including a modified term for hcp metals has been developed from the MEAM applied to the fee and bcc metals. The enthalpies of formation of all binary alloy systems for eight transition hcp metals are calculated with the MEAM. The calculations are in agreement with the experimental data available and results calculated from the Miedema theory. One can conclude that our MEAM is also effective to apply to the hcp metals and their alloys.

关键词： Transition metal alloys

Biomimetic Mineralization and Degradation of Bioelectret Film in vitro

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Journal of Wuhan University of Technology(Materials Science) 2005年第B12期20卷 83-85页

作者：屈依丽陈治清 bw Darvell West China College of Stomatology Sichuang University Chengdu 610041 China Dental Materials Science The University of Hong Kong Hong Kong

To explore the behaviour of bioelectret film in mineralization and degradation in vitro, chitosan film was prepared and polarized in an electric field at room temperature. Polarized and unpolarized chitosan films were soaked in 1.5 × SBF （ simalated body fluid） .sohaions for 7, 14 and 28 d at 37℃. The negativelycharged surface of the bioelectret film promoted greater mineralization than did unpolarized chitosan. Apatite formarion on the surface of the films was identified by X- ray diffraction and scanning electron microscopy. Bioelectret films had a higher rate of degradation than unpolarized material in vitro （ pH 7.4, 37℃ ） in the presence of 1.5 mg/mL lysozyme aver 7 d. The electret effect facilitated the degradation of the film. After 14 d, the degradation rates of the two kinds of film were the same.

关键词： bioelectret chitosan biomimetic mineralization degradation

Computer-assisted optimization of mobile phase compositions and development distance selectivity in gradient two-step development high-performance thin-layer chromatography

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Chinese Journal of Chemistry 1996年第4期14卷 354-358页

作者： Yan, bw Zhang, L Wang, QS NANKAI UNIV NATL LAB ELEMENTOORGAN CHEMTIANJIN 300071PEOPLES R CHINA

A computer-assisted method is presented for optimization of mobile phase compositions and development distance in gradient two-step development HPTLC. The method is based on a system which can predict the final R(f) values for gradient two-step development from values measured using five preliminary runs. The statistical scanning method is then used for optimization, using R(f) difference as the selection criterion. The method was evaluated using a mixture of eight components. Excellent agreement was obtained between predicted and experimental results.

关键词： gradient two-step development HPTLC mobile phase composition optimization development distance optimization

Computer-assisted optimization of temperature programming and flow rate in capillary gas chromatography

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Chinese Journal of Chemistry 1996年第3期14卷 217-221页

作者： Wang, QS Zhu, CS Yan, bw Zhang, ZC NANKAI UNIV NATL LAB ELEMENTOORGAN CHEMTIANJIN 300071PEOPLES R CHINA

A computer-assisted method is presented for simultaneous optimization of three-factor of temperature programming (initial temperature, temperature rising rate and carrier gas flow rate) for the separation of eleven compounds in capillary gas chromatography. The optimization of the separation over the experimental region is based on a special polynomial from fifteen preliminary experiments using the resolution as the selection criterion. Computer scanning technique was used for optimum selection on three dimensions. Excellent agreement was found between the predicted data and the experimental results.

关键词： capillary GC optimization microcomputer