浅析独柱连续箱梁桥在汽车偏载作用下的稳定性

汲取独柱墩梁桥倾覆事故的教训,根据夹圹互通立交桥的检测数据以及相关技术资料,对该桥进行偏载作用下的稳定性分析,得到偏载限值,为该桥的进一步决策提供一定依据。     

排球比赛中正垫与侧垫运用效果比较分析——以苏州市初中生为例

运用文献资料、现场调查和数理统计等方法,对2010年苏州市初中生排球比赛中正垫和侧垫运用效果进行现场调查与统计分析。结果表明,在2010年苏州市初中生排球比赛中,女生一传实战运用正垫1 371次,侧垫823次,男生一传实战运用正垫203次,侧垫130次;男女生总体上正垫的到位率是21.8%,侧垫的到位率是6.2%;女生运用正垫的失误率是14.1%,运用侧垫的失误率是19.7%,男生运用正垫的失误率是9.1%,运用侧垫的失误率是12.5%;女生正垫主要用于接发球、接扣球中,侧垫主要用于接拦回球、接传垫球及接其他球中,男子正垫主要用于接发球、接扣球、接传垫球,侧垫主要用于接拦回球和接其他球。     

复杂结构井防排砂的技术研究与应用

随着油田开发进入中后期,侧钻井及套损井日益增多,结构复杂井的出砂情况越来越严重,在侧钻井、套损井等结构复杂井上试验应用新型的弹性筛管,并配套实施防砂泵排砂取得成功,为结构复杂井的防砂提供了新的技术支撑点。     

日语和汉语的鼻音发音特点对比研究

文章分析了日语和汉语的鼻音、边音、日语的闪音以及前、后鼻音的发音特点,对比其差异,归纳中国南方人学习日语发音时常见的鼻音错误问题,阐明它们的规律,使初学者在掌握规律的基础上能准确地发出日语的鼻音和闪音。     

关于几何体光学中横向放大率的讨论

本文通过对光学元件及系统成像的横向放大率公式的讨论,阐述了几何光学中横向放大率的一些问题,并指出注意如何运用横向放大率公式以及各元件的公式之间的联系与区别。     

猫丘脑中央外侧核内丘脑皮质投射神经元的超微结构及其突触联系——HRP法电镜研究

本文应用HRP逆行追踪法在电镜水平上对猫丘脑中央外侧核内皮质投射神经元的超微结构及其突触联系首次进行了研究,该核内皮质投射神经元以中型多见,胞核较大,核仁清晰,偏位,核膜有凹陷,常染色质较多,胞质内含丰富的线粒体、游离核糖体和粗面内质网,标记树突直径变化较大,从0.68μm到4.4μm,含较多的线粒体、微管及滑面内质网,未见突触小泡,标记的皮质投射神经元胞体和树突做为突触后成份,与非标记的突触前成份形成下列突触:①轴-树突触,突触前轴突终末以SR型和F型居多;②轴-体突触,突触前终末中有F型和RF型;③树-树突触;④轴-轴-树突触;⑤突触复合体,许多标记树突做为中央树突参与形成汇聚型突触复合体。     

Performances of lateral flow biological aerated filter in treating domestic wastewater

1 Introduction ? The biological aerated filter technique has developed rapidly since 1980s, and is widely used in municipal sewage treatment. It has been used in the primary and secondary treatment processes due to its desirable economical efficiency and …     

带阶梯栅氧的N-LDMOS晶体管热载流子退化分析(英文)

为了减小高压N-LDMOS器件的热载流子效应并维持其开态特性,提出了一种带有阶梯栅氧的新型N-LDMOS器件结构.与传统的N-LDMOS器件相比,其栅极下方Si-SiO2界面处的电场强度明显减弱,因而可以有效地减少器件的热载流子效应,而该阶梯栅氧结构可以通过功率集成电路工艺中普遍采用的栅氧生长方法进行2次栅氧生长来获得.采用TCAD仿真技术对传统的N-LDMOS器件和所提出的新型N-LDMOS器件的热载流子退化现象进行了对比和分析,并在维持原有器件特性参数的基础上得出了新型N-LDMOS器件中厚栅氧部分的最优长度.最后,通过选取某些特性参数进行了实际的器件退化测试,结果表明该新型N-LDMOS器件的热载流子退化现象得到了很大的改善.     

Effects of leg dominance on performance of ballet turns (pirouettes) by experienced and novice dancers

Turns (pirouettes) are an important movement in ballet and may be affected by “lateral bias”. This study investigated physiological differences exhibited by experienced and novice dancers, respectively, when performing pirouette with dominant and non-dominant leg supports, respectively. Thirteen novice and 13 experienced dancers performed turns on dominant or non-dominant legs. The maximum ankle plantarflexion, knee extension and hip extension were measured during the single-leg support phase. The inclination angle of rotation axis is the angle between instantaneous rotation axis and global vertical axis in the early single-leg support phase. Both groups exhibited a greater hip extension, knee extension, and ankle plantarflexion when performing a turn on the non-dominant leg. For experienced dancers, the inclination angle of rotation axis during the pre-swing phase was generally smaller for dominant leg support than non-dominant leg. However, no significant difference was found in inclination angle of rotation axis of novice dancers. For experienced dancers, an improved performance is obtained when using the dominant leg for support. By contrast, for novice dancers, the performance is independent of choice of support leg. The significant lateral bias in experienced dancers indicates the possible influence of training. That is, repetitive rehearsal on the preferred leg strengthens the impact of side dominance in experienced dancers.     

Tensiomyography parameters and jumping and sprinting performance in Brazilian elite soccer players

Tensiomyography has been suggested as an indirect marker of muscle stiffness, which is associated with strength/power performance. Therefore, it is reasonable to suggest that tensiomyography parameters could be associated with power-related motor tasks. The purpose of this study was to investigate the association between tensiomyography parameters (from rectus and biceps femoris) and jumping and sprinting abilities in elite soccer players. In addition, we used tensiomyography parameters to compare the lateral symmetry between dominant and non-dominant legs. Twenty elite soccer players (age: 23.3 ± 4.8 years; height: 183.5 ± 6.6 cm; weight: 77.8 ± 7.5 kg) volunteered to participate in the study. Significant moderate negative correlations between biceps femoris displacement and contact time (r = –0.5, p = 0.03), rectus femoris displacement and contact time (r = –0.51, p = 0.02), and a significant moderate correlation between biceps femoris displacement and reactive strength index (r = 0.5, p = 0.03) were found. There were no correlations between tensiomyography parameters and power-related motor tasks. In addition, no differences in tensiomyography parameters between dominant and non-dominant legs were found. Our data suggest that tensiomyography parameters are not associated with power-related motor tasks performance in elite soccer players.