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斜劈盒中胆甾相液晶螺距变化对阀值电压的影响
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作者 于天池 郭青山 《武汉大学学报(自然科学版)》 CSCD 2000年第3期356-358,共3页
从实验和理论两个方面研究了斜劈盒中胆甾相液晶螺距变化对阀值电压的影响 .实验结果表明 :阀值电压不仅与螺距数有关 ,而且与边界条件引起的螺距收缩和伸展有关 ,在螺距数不变的情况下 ,螺距的收缩使阀值电压提高 ,而螺距的伸展使阀值... 从实验和理论两个方面研究了斜劈盒中胆甾相液晶螺距变化对阀值电压的影响 .实验结果表明 :阀值电压不仅与螺距数有关 ,而且与边界条件引起的螺距收缩和伸展有关 ,在螺距数不变的情况下 ,螺距的收缩使阀值电压提高 ,而螺距的伸展使阀值电压减小 .本文在 Hurault理论基础上 ,考虑到边界条件对胆甾相液晶螺距的影响 。 展开更多
关键词 胆甾相液晶 斜错线 螺距数 阈值电压 斜劈盒
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胆甾相液晶织构交替变化现象的理论探讨
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作者 于天池 郭青山 +1 位作者 王佳菱 张秀贞 《哈尔滨商业大学学报(自然科学版)》 CAS 1999年第2期45-48,共4页
为解释负性胆甾相液晶在电场作用下织构交替变化现象,建立了新的物 理模型,对Huranlt理论进行了修正,并用实验结果验证了修正公式。
关键词 胆甾相液晶 织构 螺距数
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Methods for Reducing Interface Aperture Inconsistency During NC Orbital Milling of Aircraft Laminates with Coarse Pitch
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作者 SHAN Yicai HE Ning +1 位作者 LI Liang WU Kai 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2020年第3期446-459,共14页
The methods for reducing interface aperture inconsistency are studied in NC orbital milling(NCOM)of CFRP/Ti6Al4V laminates with coarse pitch.Comparative experiments show burr,aperture inconsistency and error are typic... The methods for reducing interface aperture inconsistency are studied in NC orbital milling(NCOM)of CFRP/Ti6Al4V laminates with coarse pitch.Comparative experiments show burr,aperture inconsistency and error are typical interface defects.Meanwhile,aperture inconsistency and error are more serious than burr in NCOM with coarse pitch.As one of the major causes of interface defects,axial force and radial force are intensively studied.Based upon the machining principle of orbital milling(OM)and the actual hole-making condition in laminated structures,NCOM experiments with coarse pitch are conducted on CFRP/Ti6Al4V laminates under different cutting conditions.Then,the effects of interlayer clamping,minimal quantity lubrication(MQL),twice milling instead of reaming,and interlayer speed change on interface aperture are analyzed.Research shows that interlayer clamping,interlayer speed change and MQL can effectively reduce out-of-tolerance of interface aperture.When making holes of different diameters with one cutter,axial feed has a greater effect on interface aperture precision than tangential feed.When making holes of the same diameter with different cutters,small diameter cutter will reduce interface aperture precision in a single processing.But the method of“twice milling instead of reaming”can improve the aperture precision effectively. 展开更多
关键词 CFRP/Ti6Al4V laminates NC orbital milling coarse pitch feed interface aperture
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Feasibility study on posterior laminar screw fixation techniques in the axis 被引量:4
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作者 胡勇 何贤峰 +4 位作者 顾勇杰 徐荣明 马维虎 阮永平 林荣 《Chinese Journal of Traumatology》 CAS 2010年第2期77-82,共6页
Objective: To get morphologic parameters of Chinese adults through observation and measurement on axial laminas, to evaluate the feasibility of placing axial laminar screws and to introduce the technique. Methods: ... Objective: To get morphologic parameters of Chinese adults through observation and measurement on axial laminas, to evaluate the feasibility of placing axial laminar screws and to introduce the technique. Methods: Relative parameters of 28 sets of fresh Chinese adults' axial specimens, including distance from the superior and inferior entry points of axial laminar screws to the superior margins of axial laminas, superior, middle, inferior thickness and height of the axial laminas, length and angle of the axial laminar screw trajectories, distance from the entry points of axial laminar screws to the transverse foramen and central points of the inferior articular process, were measured with a digital caliper and a goniometer. Data were statistically analyzed. Results: Averagely, distance from the superior and inferior entry points of axial laminar screws to the superior margins of axial laminas was 5 mm and 9 mm, superior, middle, inferior thickness and the height of the axial laminas were 3.2 mm, 6.7 mm, 5.5 mm and 12.8 mm respectively, and the length of the superior and inferior axial laminar screw trajectories was 26.2 mm and 25.5 ram, respectively. Conclusions: It is feasible and reliable to apply posterior laminar screw fixation techniques to the axes of Chinese adults. Also the C2 laminar screw fixation technique can be taken as a supplementary to conventional posterior screw fixations of C2. 展开更多
关键词 ANATOMY AXIS Bone screws Cervical vertebrae
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