The limit analysis in soil and rock： a mature discipline of geomechanics

The solution of a slope stability problem can be approached by its least upper-bound and maximum lower-bound with high accuracy. The limit equilibrium methods that employ vertical slices imply a lower bound of the factor of safety. It has been successfully extended to the area of active earth pressure analysis that accounts for different input of locations of earth pressure applications. Those methods that employ slices with inclined interfaces give an upper-bound approach to the stability analysis. It enjoys a sound mechanical background and is able to provide accurate solutions of soil plasticity. It has been successfully extended to the area of bearing capacity analysis in which various empirical coefficients are no longer necessary. The 3D upper- and lower-bound methods under this framework have been made possible and show great potential for solving various engineering problems.     

最优区间估计问题的探讨

文中讨论了区间估计的最优性，并证明了最优区间估计的存在性，同时给出了一种寻求最优区间估计的方法．     

人类科学中现有经典极限论的终结(Ⅱ)

进一步分析、揭示了现有经典极限论在理论上与实际操作中的三个主要缺陷,宣告经典极限论的终结.     

罗比塔法则的推广和应用

在求不定式极限时,罗比塔法则是较为简便而有效的工具.在削弱了罗比塔法则的条件下,证明了其结论仍然是成立的.     

证明lim(1+1/n)~n(from n=-∞ to ∞)存在的新方法

文章利用构造不等式bn +1 -an +1b -a <(n + 1)bn(0≤a 相似文献   

累次极限与二重极限的关系研究

在累次极限与二重极限定义的基础上讨论了累次极限与二重极限的关系，从理论上指出累次极限不能看作二重极限特例的根本原因。     

MM教学方式在数列极限教学中的应用

在微积分学中，极限的教学历来被认为是教学的重点和难点。采用MM教学方式设计数列极限的教学，能使学生在轻松愉快的环境中清楚地理解与掌握数列极限的概念。     

不允许卖空的风险证券组合最优选择的区间方法

本文利用区间分析方法有效地解决了在不允许卖空的条件下一类证券组合最优选择问题。     

试论约翰逊时期美国对以色列武器政策的转变

美国长期坚持对以色列的"武器限制"政策,实质是保证以色列武器优势的同时,确保中东地区的稳定,不给苏联插手中东的机会。约旦武器问题给美国传统中东武器政策的执行造成了巨大的困难。美国坚决要取得对苏冷战胜利的决心与传统对以色列的国家安全的责任之间出现不可调和的矛盾。在充分权衡全球利益与地区利益的关系之后,美国与以色列进行了艰苦的谈判,最终形成了对阿以的"武器均衡"政策。"武器均衡"政策暂时地帮助美国走出了政策的困境,但是随之产生了更加严重的后果。     

Exercise training increases the S-Klotho plasma levels in sedentary middle-aged adults: A randomised controlled trial. The FIT-AGEING study

ABSTRACT

This study aimed to investigate the effects of different training modalities on the soluble Klotho (S-Klotho) plasma levels in sedentary middle-aged adults. A total of 74 middle-aged adults (53.4 ± 5.0 years old; 52.7% women) were enrolled in the FIT-AGEING study. We conducted a 12-week randomised controlled trial. The participants were randomly assigned to 4 different groups: (i) a control group (no exercise), (ii) a physical activity recommendation from the World Health Organization group (PAR), (iii) a high intensity interval training group (HIIT), and (iv) a high intensity interval training group adding whole-body electromyostimulation training group (HIIT-EMS). S-Klotho plasma levels, anthropometric measurements, and body composition variables were measured before and after the intervention programme. All exercise training modalities induced an increase in the S-Klotho plasma levels (all P ≤ 0.019) without statistical differences between them (all P ≥ 0.696). We found a positive association between changes in lean mass index and changes in the S-Klotho plasma levels, whereas a negative association was reported between changes in fat mass outcomes and changes in the S-Klotho plasma levels after our intervention study. In conclusion, our results suggest that the link between exercise training and the increase in S-Klotho plasma levels could be mediated by a decrease of fat mass and an increase of lean mass.