H3C网络实验室远程开放的设计与实现     

蓝贞雄 《大众科技》2015,(3):5-7

为实现H3C网络实验室的远程开放,提高网络实验室的利用率,文章首先就网络实验室及实验机架的网络设计、网络设备集中管理以及SSL VPN技术特点等问题进行了阐述,然后结合实例给出了具体的配置实现方法。  相似文献   

特殊职业技术教育对赫哲鱼皮文化传承的研究     

曾红玲 《佳木斯教育学院学报》2015,(4):45+47

在特教学校结合职业技术教育,探讨了赫哲鱼皮文化的学习和传承。通过特教学校设为校本课程,进行了赫哲鱼皮画技艺的理论教学和实践教学,研究了传承赫哲鱼皮文化的"1+2+3"模式,论述了在文化知识、制作工艺、操作技术、艺术品质方面的传承内涵,总结了几年来的教学经验和特教职教启示,展望了赫哲鱼皮文化发展远景。  相似文献   

一种机载重轨InSAR高精度三维定位方法     

董小桐  韩春明  岳昔娟  赵迎辉 《中国科学院大学学报》2019,36(6):844-850

在重轨干涉实际测量中，两次飞行航迹难以保持高度重合，飞行高度和姿态不稳定，干涉图像对存在明显不规则的相对形变，难以进行三维定位。通过分析重轨机载InSAR图像对的几何形变和形成原因，提出一种从精准的InSAR成像几何关系出发，通过修正成像参数，实现机载重轨InSAR高精度三维定位的方法。该方法通过引入地面控制点，实现干涉图像对精准的相对定位，生成高精度DEM；并利用高精度DEM，实现机载重轨InSAR高精度三维定位。对比检查点实测结果和定位结果，表明该方法可有效地解决机载重轨InSAR的三维定位困难的问题。  相似文献   

Between-limb differences in running technique induces asymmetric negative joint work during running     

Satoru Hashizume  Hiroaki Hobara  Yoshiyuki Kobayashi 《European Journal of Sport Science》2019,19(6):757-764

Negative work, which is mainly generated by eccentric muscle contraction, has an important influence on the associated muscle damage. Generally, mechanical parameters are determined for one side of a lower extremity on the assumption of negligible between-limb differences. However, between-limb differences in the negative work of lower extremity joints during running remain unclear. This study examines between-limb differences in negative work and associated mechanical parameters during the contact phase of running. Twenty-five young adult males voluntarily participated in this study. Each participant was asked to run on a straight runway at a speed of 3.0?m?s^?1. Negative work, amplitude, duration of negative power, moment, and angular velocity were computed for both sides of the lower extremities. Significant differences were found in negative work between limbs for the hip (18.9?±?11.7%), knee (13.6?±?10.4%), and ankle (11.8?±?8.5%) joints. For the hip joint, asymmetric negative work was attributable to the between-limb difference in the amplitude of negative power owing to a corresponding difference in the moment. The between-limb differences concerning the duration and amplitude of negative power could explain the asymmetric negative work in the knee joint. The asymmetric negative work of the ankle joint was attributable to the between-limb difference in the amplitude and duration of the negative power and the moment. These results indicate that asymmetric negative work was generated in each lower extremity joint; however, the major mechanical parameters corresponding to the negative work are not the same across the joints.  相似文献   

间歇运动激活心梗大鼠心肌NRG1-PI3K/Akt通路抑制心肌细胞凋亡     

谭支内  蔡梦昕  陈婷  Shaojun Du  田振军 《北京体育大学学报》2016,39(6):69-76+83

摘要：目的: 探讨心脏NRG1在间歇运动激活心梗(myocardial infarction，MI)大鼠心肌NRG1-PI3K/Akt通路抑制心肌细胞凋亡的作用。方法：雄性SD大鼠48只，随机分为假手术组(S)，心梗安静组(MI)，心梗+间歇运动组(ME)，心梗+间歇运动+抑制剂组(MEA)，每组12只。采用左冠脉前降支结扎法建立MI模型。S组手术仅穿线不结扎。ME组和MEA组在MI术后1wk进行跑台间歇运动。运动开始速度为10m/min运动10min后，速度逐渐增至25m/min×7 min，再以15 m/min×3min运动，之后依次交替进行。60min×1次/d，5d/1wk×8wk。训练结束后次日，腹腔麻醉，颈动脉插管测定LVSP、LVEDP及±dp/dtmax。之后开胸摘取心脏，进行组织学制片，Masson染色。荧光实时定量PCR测定心肌NRG1及其受体ErbB2/4表达。Western Blot法检测心肌NRG1、ErbB2/4、PI3K/Akt、Bcl-2和Bax蛋白含量。Caspase3表达及TUNEL检测观察分析心肌细胞凋亡情况。结果: MI组胶原容积百分比(CVF)和LVEDP较S组显著升高(P<0.01,P<0.01)，LVSP和±dp/dtmax显著降低(P<0.01,P<0.01)。且MI后心肌ErbB4 mRNA表达显著降低(P<0.01)，心肌NRG1、ErbB2和ErbB4蛋白表达显著降低(P<0.05,P<0.01,P<0.01)，PI3K/Akt蛋白表达及Bcl-2/Bax比值显著降低(P<0.01,P<0.01)，TUNEL阳性细胞数和Caspase3活力显著增加(P<0.01,P<0.01)。ME组CVF和LVEDP较MI组显著降低(P<0.01,P<0.01)，LVSP和±dp/dtmax显著升高(P<0.01,P<0.01)，心肌NRG1、ErbB2和ErbB4 mRNA及蛋白表达均显著增加(P<0.01,P<0.01,P<0.01)，PI3K/Akt蛋白表达和Bcl-2/Bax比值显著增加(P<0.01,P<0.01)，TUNEL阳性细胞数和Caspase3活力显著降低(P<0.01,P<0.01)，且运动效应被抑制剂AG1478显著减弱。结论:间歇运动可通过激活心肌NRG1及其受体表达，上调PI3K/Akt蛋白表达，抑制心肌细胞凋亡和胶原过度增生，改善心功能。  相似文献   

Image-based modeling approach in creating 3D morphogenetic reconstruction of Liberty Square in Novi Sad     

Vesna Stojakovic  Bojan Tepavcevic 《Journal of Cultural Heritage》2011,12(1):105-110

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论《3DS MAX效果图技法》教学改革     

刘晓荣  张超 《当代教育理论与实践》2011,3(6):67-69

针对传统的《3DS MAX效果图技法》教学模式,结合多年从教经验和室内设计行业的实际工作特点,以＂精＂、＂准＂和＂明晰＂、＂有效＂为标准原则,对《3DS MAX效果图技法》课程的教学内容和教学方法进行针对性改革,并对改革实践作出总结。  相似文献   

基于ActiGraph GT3X监测网球运动能量消耗的研究          下载免费PDF全文

袁川 《河北体育学院学报》2017,31(4):83-91

目的:应用ActiGraph GT3X对网球运动等非周期性运动能量消耗进行测评,建立适合网球运动能耗预测的回归方程,从而丰富ActiGraph测量体系.方法:以K4b2测量值作为校标,分别在拍柄、持拍手手腕外侧、腰部髂肌外侧、大腿中央前侧和脚踝外侧(持拍手同一侧肢体)各佩戴一个加速度计(ActiGraph GT3X),同步对网球运动中不同球速下(30 km/h、60 km/h)的原地正、反手击球,侧向移动正、反手击球,向前移动正、反手击球,侧向移动正反手交替击球和模拟自由单打的运动过程进行监测.结果:腰部、大腿和踝关节部位GT3X的EE和MET预测值存在明显低估,与K4b2测量值一致性较低;手腕和拍柄部位GT3X的EE和MET预测值存在明显高估,与K4b2测量值一致性较低;研究建立了2个网球运动能耗预测回归方程,经检验其预测值与实测值没有显著性差异.结论:运用ActiGraph GT3X对网球等隔网对抗运动项目进行监测存在显著误差,EE和MET的预测存在明显高估或低估的现象;基于ActiGraph GT3X所建立的能耗预测方程能对网球运动进行有效的运动监测.  相似文献   

Electro-mechanically controlled assembly of reconfigurable 3D mesostructures and electronic devices based on dielectric elastomer platforms     

Wenbo Pang  Xu Cheng  Haojie Zhao  Xiaogang Guo  Ziyao Ji  Guorui Li  Yiming Liang  Zhaoguo Xue  Honglie Song  Fan Zhang  Zheng Xu  Lei Sang  Wen Huang  Tiefeng Li  Yihui Zhang 《国家科学评论(英文版)》2020,7(2):342

The manufacture of 3D mesostructures is receiving rapidly increasing attention, because of the fundamental significance and practical applications across wide-ranging areas. The recently developed approach of buckling-guided assembly allows deterministic formation of complex 3D mesostructures in a broad set of functional materials, with feature sizes spanning nanoscale to centimeter-scale. Previous studies mostly exploited mechanically controlled assembly platforms using elastomer substrates, which limits the capabilities to achieve on-demand local assembly, and to reshape assembled mesostructures into distinct 3D configurations. This work introduces a set of design concepts and assembly strategies to utilize dielectric elastomer actuators as powerful platforms for the electro-mechanically controlled 3D assembly. Capabilities of sequential, local loading with desired strain distributions allow access to precisely tailored 3D mesostructures that can be reshaped into distinct geometries, as demonstrated by experimental and theoretical studies of ∼30 examples. A reconfigurable inductive–capacitive radio-frequency circuit consisting of morphable 3D capacitors serves as an application example.  相似文献   

CY3菌株代谢中间产物的氧化产物的分析与鉴定   总被引：1，自引：0，他引：1  

李静  苏占雄  沈小娟  刘超 《黑龙江科技信息》2011,(12):67-68

实验通过研究发现CY3菌株不但能代谢原始的多环芳烃,还可以在很短的时间内将中间产物代谢掉,从而使这些中间产物不易积累。通过GC-MS来鉴定CY3菌株将1-羟基-2-萘甲酸降解为1-羟基萘,1,2-二羟基萘等。  相似文献