关于有限平坦表现模

将有限表现模限制在平坦维数≤1,得到有限平坦表现模及其性质,利用有限平坦表现模类给出了其Ext-正交模即FFP-内射模,刻画了右F-凝聚环与右F-正则环。在环的几乎优越扩张S≥R下,证明了S为右F-凝聚环当且仅当R为右F-凝聚环,S为右F-正则环当且仅当R为右F-正则环。     

Stability of switching linear systems with switching signals driven by stochastic processes

This paper presents conditions to assure the exponential stability in probability for autonomous switching linear systems. The switching signal acting on the autonomous system produces intervals that follow independent, identically distributed stochastic processes—the stability then follows by verifying simple-to-check linear matrix inequalities.     

Initial Validity and Reliability of the Portuguese Borg Rating of Perceived Exertion 6-20 Scale

ABSTRACT

The aims of this study were to perform the cross-cultural adaptation of the Borg Rating of Perceived Exertion (RPE) 6–20 Scale to Brazilian Portuguese language and to start testing its validity and reliability. After performing the cross-cultural adaptation of the Scale, concurrent and discriminative validity, and reliability were determined on a treadmill in young (18–30 years) and older adult women (60–75 years). Considering young and older adult women, RPE presented high and moderate positive correlation with heart rate and high and low positive correlation with oxygen consumption, respectively. Older adult women presented RPE (11 ± 2) significantly higher than young ones (8 ± 1) exercising at the same absolute intensity. Intraclass coefficient correlation was excellent for RPE to young and older adult women. The Scale presented concurrent validity only to young adult women, whereas it presented discriminative validity between such groups of women. Moreover, the scale is reliable to young and older adult women.     

“双创”中投资决策信息需求的统计分析与启示

以央视《创业英雄汇》节目的233个创业项目为研究对象,设计指标体系并结合案例分析法对投资人的信息 需求进行分析。分析结果表明：目前投资人对农林牧渔业更加关注项目规划信息,对轻工食品业更加关注产品组合以 及供应商方面的信息,对信息产业更加关注技术环境信息,对服务业更加关注竞争格局的信息。最后在此分析的基础 上提出3 点建议。     

Casting the assessment net wide: Capturing all student learning

North Georgia College and State University has joined a national effort to move away from the isolated approach to measuring student learning. Educators from three divisions offer their perspectives.     

Is content knowledge pre-requisite of pedagogical content knowledge? An empirical investigation

Journal of Mathematics Teacher Education - Given the scarcity of studies explicitly exploring the often tacit assumption that teachers’ content knowledge (CK) is pre-requisite of pedagogical...     

Numerical investigation of penetration performance of non-ideal segmented-rod projectiles

The design of a segmented-rod projectile is often simplified into an ideal one in theoretical analysis for the convenience of modeling of its performance. But the actual performance of non-ideal segmented-rod projectiles over the impact velocity range in practical applications was rarely explored. AUTODYN numerical code is used to investigate the influence of the component design upon the penetration performance of non-ideal segmented-rod projectiles over a wide range of impact velocities, which can be used to guide the optimal design of weaponry segmented-rod projectiles.