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Confocal Laser Scanning Microscope Evaluation of Early Bacterial Colonization on Zirconium Oxide and Titanium Surfaces:An in vivo Study

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Journal of Wuhan University of Technology(Materials Science) 2013年第2期28卷 396-399页

作者：王敏白轶 YANG Hui ZOU Haixiao 夏海斌王贻宁 Key Laboratory for Oral Biomedicine of Ministry of Education School and Hospital of Stomatology Wuhan University Department of Implantology School and Hospital of Stomatology Wuhan University Department of Stomatology Shanghai Punan Hospital Department of Prosthodotics School and Hospital of Stomatology Wuhan University

To investigate the bacterial colonization on zirconium oxide and titanium surfaces in vivo quantitatively using a confocal laser scanning microscope （CLSM）. Ten samples of zirconium oxide ceramic and commercially pure titanium were fabricated and polished using silicon carbide abrasive paper. One sample from each group was evaluated topographic pattern under a scanning electron microscope. One sample from each group was to evaluate roughness using a profilometer. Eight volunteers were selected. The samples were cemented at the buccal surfaces of upper first molars. All samples were removed after 48 hours, immersed in SYTO-9 and propidium iodide fluorescent to stain for adherent bacteria and obseIved with CLSM. Fewer bacteria were observed in zirconia group than titanium group. However, there was no statistical difference between two groups. The experimental results demonstrate that zirconium oxide may be considered as a promising material for dental implant abutments.

关键词： dental implant abutment zirconium oxide bacterial colonization confocal laser scanning microscope

Control mechanism and technique of floor heave with reinforcing solid coal side and floor corner in gob-side coal entry retaining

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International Journal of Mining Science and Technology 2012年第6期22卷 832-836页

作者： Chen Yong Bai Jianbiao Yan Shuai Xu Ying Wang Xiangyu Ma Shuqi State Key Laboratory of Coal Resources and Mine Safety School of MinesChina University of Mining & Technology Faculty of Engineering University of Wollongong

Floor heave is the most common convergence in gob-side entry retaining.The paper analyzes the form,process and characteristics of gob-side entry retaining with the comprehensive methods of theoretical analysis,numerical simulation and the field trial.Research results present that bending and folding floor heave is the main factor in the stage of the first panel mining;squeezing and fluidity floor heave plays a great role in the stable stage of gob-side entry retaining;the combination of the former two factors affects mainly the stage of the second mining ahead;abutment pressure is a fundamental contribution to the serious floor heave of gob-side entry retaining,and sides corners of solid coal body are key part in the case of floor heave controlling of gob-side entry retaining.Floor heave of gob-side entry retaining can be significantly controlled by reinforcing sides and corners of solid coal body,and influence rules on the floor heave of gob side entry retaining of sides supporting strength and the bottom bolt orientation in solid coal side are obtained.Research results have been successfully applied in gob-side entry retaining of G20-F23070 face haulage roadway in #2 coal mine of Pingmei Group,and the field observation shows that the proposed technique is an effective way in controlling the floor heave of gob-side entry retaining.

关键词： Gob-side entry retaining abutment pressure Forms of floor heave Reinforcing sides of solid coal side Bolt in a floor corner

Determination of Rational Staggered Distance Between Double-Longwall Faces in Mining Operation on Confined Aquifer

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International Journal of Mining Science and Technology 2000年第2期21卷 111-115页

作者：黄侃彭苏萍罗立平王磊段延娥

The influence of staggered distance on the failure of floor bed is locally and temporarily defined in double longwall mining on the confined aquifer. When the longwall mining reaches a certain scale, the deepest failure of floor bed depends on macroscopic technological parameters of mining and geological conditions. The temporary as well as the terminal failure depth does not change with the mining staggered distance (5~30 m). Based on the mining and geological conditions on the 2 635 double longwall mining panel of Yangzhuang Coal Mine, the changes of abutment pressure was observed and numerically simulated. The result shows that the rational staggered distance should be not more than 10 m.

关键词： confined aquifer rational staggered distance double longwall mining abutment pressure observation numerical simulation water inrush of floor

APPROACHES TOWARDS THE 315m-HIGH BAKHTIYARI DAM SITE

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APPROACHES TOWARDS THE 315m-HIGH BAKHTIYARI DAM SITE