Cloud Computing for Voxel-Wise SEM Analysis of MRI Data

As data collection costs fall and vast quantities of data are collected, data analysis time can become a bottleneck. For massively parallel analyses, cloud computing offers the short-term rental of ample processing power. Recent software innovations have reduced the effort needed to take advantage of cloud computing. To demonstrate, we replicate a voxel-wise examination of the genetic contributions to cortical development by age using evidence from 1748 MRI scans. Specifically, we employ off-the-shelf Kubernetes software that permits us to re-run our analyses using almost the same computer code as was published in the original article. Large, well funded institutions may continue to maintain their own computing clusters. However, the modest cost of renting and ease of utilizing cloud computing services makes unprecedented compute power available to all researchers, whether or not affiliated with a research institution. We expect this to spur innovation in the sophisticated modeling of large datasets.     

双线性系统的预测控制

从预测控制的一般原理出发,利用双线性Volterra模型和离散化I/0模型,实现一类非线性系统———双线性系统的预测控制。通过对控制算法和应用问题的理论推导与分析,证明文中所提方案保持了线性预测控制的大多数优点,并具有在线计算简便和控制品质较好的特点。     

The development of competence and its social context

Several recent interpretations of the nature and development of competence are discussed, focusing on Gelman's proposal to view the development of concepts as the product of the interaction of conceptual, procedural, and utilization competences. In so doing, she proposes a solution to the dilemma (which many other theories could not avoid) of emphasizing either the construction of knowledge or the influence of experience in the development of understanding. However, Gelman does not consider the basically social nature of the development of competence. In this essay, it is argued that adults transmit perspectives on reality to children and in this way introduce them to what is considered worth knowing in the culture. Because a child's present abilities are integrated into such perspectives, these abilities are, at the same time, both utilized and modified. It is, therefore, implausible to ascribe the availability of general principles to very young children, as Gelman does in her theory of numerical competence. Two rival experiments on the development of numerical concepts are discussed. It is argued that the solution the children construct in these experiments is dependent on the perspective transmitted to them by the experimenter. Some educational consequences of a social context view on competence are presented.     

NUMERICAL SIMULATION OF DIODE-PUMPED DOUBLE-CLAD Tm-Ho DOPED FLUORIDE LASERS

报导芯泵浦和包层泵浦两种情况下，工作于２．０４μｍ的Ｔｍ－Ｈｏ双掺氟基光纤激光器的数值模拟．数值模型考虑了交叉弛豫和能量转移过程对激光运转的影响，并考虑了沿光纤传输过程的信号和泵光损耗．模型用一个子程序来模拟包层泵浦的吸收过程并给出了与实验符合的结果，与芯泵浦Ｔｍ－Ｈｏ双掺光纤激光器的实验结果比较说明理论计算和实验结果符合得相当好，并在此基础上为建造新的包层泵浦高效Ｔｍ－Ｈｏ氟基光纤激光器提供了优化参数．     

幂级数在组合概率计算中的应用

通过求解一类丢番图方程解的个数，介绍了生成函数的构造方法和技巧，从而以幂级数作为生成函数，介绍了它在组合概率计算中的应用．     

《玉米》系列中女性权力意识的虚妄性

在女性主义视角下,对毕飞宇的《玉米》系列进行重新解读,以文本之内到文本之外的三重证言,揭示其女性权力意识的虚妄性,即女性权力意识的存在性虚妄、女性权力意识的本质虚妄、女性权力意识主体虚妄或虚妄的预设性条件。虚妄的实质在于男性意识中心下的男性话语强权。     

双液滴垂直冲击薄液膜的数值模

The normal impingement process of two water droplets upon a thin film on the solid surface was numerically investigated. The numerical treatment was based on the finite volume solution of the Navier-Stokes （N-S） equations combined with the volume of fluid method （VOF）. Physically reasonable results for the process of two droplets impacting on the thin film were obtained. The effects of the droplet velocity, the fihn thickness and the spacing between the two droplets on the splash and spread process of the impact were examined.     

论关仁山的"平原小说"

关仁山的“平原小说”深刻地揭示了农村许多重大问题,密切追逐农村改革变化的动态和走向,剖解农民心灵流变和命运起落的历程,深刻地表现了农民走向自我觉醒、自我选择的确立自主人格和独立意识的心路历程。     

PLC在绕线式电动机起动控制中的应用

在绕线式电动机的起动过程中，采用PLC控制系统，可以克服线路复杂，器件较多，动作慢，可靠性不高等缺点。     

气液两相搅拌槽内气泡直径的数值模拟

搅拌槽内气泡直径是一个很重要的参数.本文对搅拌槽内气泡直径进行了数值模拟,模拟结果表明,在搅拌槽内排出流区和循环区内模拟值同实验值的吻合情况都比较好.在模拟过程中仅考虑了湍流动能耗散率对气泡大小的影响,没有考虑到气泡本身凝并和循环过程,所以在循环区中模拟值要比实验值稍大.