排序方式： 共有12条查询结果，搜索用时 171 毫秒
1.
Mauricio Garzon Olivier Dupuy Laurent Bosquet Anil Nigam Alain Steve Comtois Martin Juneau 《European Journal of Sport Science》2017,17(3):310-316
This study compared heart rate recovery (HRR) after incremental maximal exercise performed at the same external power output (Pext) on dry land ergocycle (DE) vs. immersible ergocycle (IE). Fifteen young healthy participants (30?±?7 years, 13 men and 2 women) performed incremental maximal exercise tests on DE and on IE. The initial Pext on DE was 25?W and was increased by 25?W/min at a pedalling cadence between 60 and 80?rpm, while during IE immersion at chest level in thermoneutral water (30°C), the initial Pext deployment was at a cadence of 40?rpm which was increased by 10?rpm until 70?rpm and thereafter by 5?rpm until exhaustion. Gas exchange and heart rate (HR) were measured continuously during exercise and recovery for 5?min. Maximal HR (DE: 176?±?15 vs. IE 169?±?12?bpm) reached by the subjects in the two conditions did not differ (P?>?.05). Parasympathetic reactivation parameters (ΔHR from 10 to 300?s) were compared during the DE and IE HR recovery recordings. During the IE recovery, parasympathetic reactivation in the early phase was more predominant (HRR at Δ10–Δ60?s, P?<?.05), but similar in the late phase (HRR at Δ120–Δ300?s, P?>?.05) when compared to the DE condition. In conclusion, incremental maximal IE exercise at chest level immersion in thermoneutral water accelerates the early phase parasympathetic reactivation compared to DE in healthy young participants. 相似文献
2.
现在，中学生恋爱较为普遍，绝大多数家长和教师都持反对态度，这一心理现象主要是受儒佛道伦理观、功利主义教育观、唯我独尊的法制观影响形成的．随着人本主义思想逐步深入人心，法治社会逐步完善，人们的伦理观、教育观和法制观也应有一个同步的转变。 相似文献
3.
以冶金工业废水作为水源,采用连续浸没式微滤（CMF-S）的工艺技术,运行跨膜压差小,能耗低,膜元件使用运行寿命长“。多介质过滤器＋微滤（CMF-S）”的工艺技术组合作为反渗透的预处理系统,模块化设置,占地小,节省空间。而且微滤为多孔膜,且膜孔径为0.1μm,相比超滤技术不易堵塞,反洗时效果好,运行周期长。 相似文献
4.
杨海贤 《新乡师范高等专科学校学报》2006,20(5):32-33
探讨在矿物的铜渣中氰化条件对金银浸出率影响的原因,提出其提高金银浸出率的最佳氰化条件,为工业提取金银生产实践提供依据。结果表明,浸铜渣中NaCN用量为10 kg/t,液固比为2.5,运用炭浸法(CIL),氰化时间为16 h时效果最佳。 相似文献
5.
A numerical simulation of the interaction between laminar flow with low Reynolds number and a highly flexible elastic sheet is presented. The mathematical model for the simulation includes a three-dimensional finitevolume based fluid solver for incompressible viscous flow and a combined finite-discrete element method for the three-dimensional deformation of solid. An immersed boundary method is used to couple the simulation of fluid and solid. It is implemented through a set of immersed boundary points scattered on the solid surface. These points provide a deformable solid wall boundary for the fluid by adding body force to Navier-Stokes equations. The force from the fluid is also obtained for each point and then applied on the boundary nodes of the solid. The vortex-induced vibration of the highly flexible elastic sheet is simulated with the established mathematical model. The simulated results for both swing pattern and oscillation frequency of the elastic sheet in low Reynolds number flow agree well with experimental data. 相似文献
6.
7.
8.
对于椭圆型界面问题,针对浸入有限元法的离散方程组,基于四类利用界面曲线信息和跳跃条件构造的浸入式插值延拓算子,建立经济的瀑布型多重网格法,数值实验结果表明,基于高次浸入式插值延拓算子的经济的瀑布型多重网格法更具有效性。 相似文献
9.
王凤 《黑龙江教育学院学报》2006,25(2):145-146
随着国际关系专业在各大专院校的普遍设立,以及对外交往的频繁,对于具有扎实理论功底、能够熟练掌握外语人才的需求逐渐增加。而双语教育旨在培养大批能够同时使用母语和第二语言进行交际的复合型专业人才。因此,探讨国际关系课程双语教学改革是十分必要的。 相似文献
10.
沉井施工技术复杂，应用于海滩深基础施工难度更大。通过报告北山岭百万吨油库海水消防泵房工程在这方面所作的有益尝试，对沉井施工有关技术问题作了进一步的探讨，提出了若干措施和处理意见。 相似文献