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1.
“重击”不但成为有效的得分手段，而且效果显著可直接获优势胜利。散手运动实践表明，灵活、巧妙地运用重拳或横踢腿击头，最易达到“重击”的目的。本文举例说明在主动进攻及防守反击中实施重击的技巧。 相似文献
2.
发展乡村产业是推进农业农村现代化的重要引擎,是乡村全面振兴的重要根基。根据乡村产业内涵特征,运用熵值法对广东省及21个省辖市乡村产业发展水平进行了定量化描述。研究发现：在政策、市场等诸多因素推动下,2015-2020年间广东省乡村产业发展水平整体呈强劲上升态势,珠三角地区农业绿色发展水平较高、业态类型更为丰富、农民就业增收效果明显;粤东粤北地区创新创业更为活跃;粤北地区产业融合发展水平较高,注重拓展农业多种功能、挖掘发展地理标志特色产业,食品工业产值与农业总产值之比、设施农业占比、淘宝村和淘宝镇数量等指标市域间差异较大。 相似文献
3.
梁富亮单杠团身后空翻一周半越杠再握动作的运动学分析 总被引：2，自引：2，他引：0
通过运动学分析揭示了我国优秀运动员完成的单杠团身后空翻一周半越杠再握动作的运动学规律与技术特点,对于进一步发展此类动作有积极的作用. 相似文献
4.
基于一个新的核函数,为一类水平线性互补问题设计了一个新的算法,通过一定的分析技巧,给出了该算法的良好多项式复杂性。 相似文献
5.
An experimental investigation is performed on side wall deformation at the pendant convective pass （PCP） in a 300 MW and a 600 MW utility boiler. The temperature distributions are measured on the side wall areas of the water-cooled wall, the PCP and the horizontal convective pass （HCP） in the two utility boilers. These experiments show that there are great temperature differences in the side wall areas during the startup process in both utility boilers. These temperature differences can reach 80-150 ~C with the side wall temperature in the PCP area higher than those in the water-cooled wall and the HCP. The highest temperature in the PCP is close to the flue gas side temperature at the same position in the horizontal flue gas pass. Thermal stress analyses are conducted in the side wall areas in the water-cooled wall, the PCP and the HCP with the software ANSYS. The results show that, at great temperature differences, the PCP side wall undergoes negative thermal stresses that exceed the yield strength causing deformation in the PCP side wall. 相似文献
6.
智能式电容水平测定仪的设计方案 总被引：1，自引：0，他引：1
我们在日常生活中所见的水平测定仪,在使用过程中功能过于单一,即只能检测被测面水平与否。对此,我提出了一个新的解决方案,就是利用变介质式电容传感器制成一种既具有能够进行水平测定功能,又具有能够测量、设定一定倾斜角度功能的智能式电容水平测定仪。本文主要介绍这种电容式传感器的结构、工作原理和电路设计。这种仪器是有源器件,它在使用过程中需要用到只是普通的220伏交流电,它有测量范围广、测量精度高、灵敏度好的优点。 相似文献
7.
Moving ships and other objects drifting on water often impact a bridge's pile foundation. The mechanical model of the piles-bridge
structure under horizontal forcing was established, and a time-domain approach based on Finite-difference Method was developed
for analyzing the dynamic response of the piles-bridge structure. For a single pile, good agreement between two computed results
validated the present approach. The slenderness ratio of the pile, the pile-soil stiffness ratio and the type of the structure
influence the dynamic response of the piles-bridge structure. The computed results showed that the stiffness of the structure
determines the dynamic response of the piles-bridge structure under horizontal forcing.
Project (No. 001110442) supported by the Science and Technology Bureau of Zhejiang Province, China. 相似文献
8.
Margareta Sandström Kjellin Corresponding author 《Scandinavian Journal of Educational Research》2013,57(2):153-165
A model for analysing the nature of the dyadic teacher–student interplay in instructional situations including one teacher and one student is described. The “teacher” may be a regular teacher, a parent, or any other person who is in the position of teacher. The “student” may be a student of any age. The model may discern (a) if the teacher merely asks for information preknown to the teacher and the teacher evaluates the student's answer according to the teacher's preknowledge, (b) if the teacher asks for information preknown to the teacher, the teacher then scaffolds the student's learning by giving clues to the correct answer and then evaluates the answer according to the teacher's preknowledge, or (c) the teacher asks for information not preknown to her/him and the teacher is genuinely interested in the student's answer. This last scenario (c) is thought to give optimal conditions for cognitive development for the student. 相似文献
9.
跨系统或跨行业的电子政务信息资源横向共享是政务信息资源共享目标实现的关键,是开展协同政务的基础,是公共服务社会化的保障。横向政务信息资源共享的实现,目前最主要的障碍是行政体制的制约和电子政务本身发展的影响。要克服以上障碍,须采取以下主要对策,即:建立既合作又竞争的共享机制,实行行政干预下的自愿共享模式,完善可互操作的标准体系。 相似文献
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