A new research on auto compatible default theory

Ｅｘｔｅｎｓｉｏｎｉｓｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔｃｏｎｃｅｐｔｉｎｄｅｆａｕｌｔｌｏｇｉｃ．Ｒｅｉｔｅｒｈａｄｍａｄｅｓｏｍｅｒｅｓｅａｒｃｈｏｎｔｈｅｓｐｅｃｉａｌｋｉｎｄｏｆｄｅｆａｕｌｔｌｏｇｉｃ,ｔｈａｔｉｓｎｏｒｍａｌｄｅｆａｕｌｔｌ...     

Systematic studies on the neotropical genus Fusaea (Baill.) Saff.(Annonaceae)

ＴｈｅｇｅｎｕｓＦｕｓａｅａｗａｓｆｏｕｎｄｅｄｂｙＳａｆｏｒｄ［１］ｉｎ１９１４．ＴｈｅｔｙｐｅｓｐｅｃｉｅｓＦ．ｌｏｎｇｉｆｏｌｉａｗａｓｏｒｉｇｉｎａｌｙｄｅｓｃｒｉｂｅｄｂｙＡｕｂｌｅｔ［２］ａｓＡｎｎｏｎａｌｏｎｇｉｆｏｌｉａ．Ｂａｉｌｏ...     

2,3-二氯-6-羧酰氯喹啰啉活性染料反应活性及“染料-纤维”键的稳定性

对２,３－二氯－６－羧酰氯喹啉类活性染料的反应活泼性以及“染料－纤维”键的稳定性进行了反应动力学研究,测定水解速度常数;与其他类型活性染料进行比较,对此类活性染料性能进行了评价。     

QUALITATIVE ANALYSIS FOR A THIRD-ORDER DIFFERENTIAL EQUATION IN A MODEL OF CHEMICAL SYSTEMS

In this paper a mathematical model of chemical systems is investigated.We present the conditions for the existence and local stability of the steady statesand the periodic solution of the Hopf type.Specifically,we show by using an ana-lytical method that there may exist two or four Hopf bifurcation points separatedat a finite distance from each other;at the same time,a technique for studying theHopf bifurcation value is given.     

计算机化自适应认知诊断测验按模式分层选题策略

提出了一种题库按属性模式分层并结合项目Fisher信息量、曝光控制因子和项目优先级的新的选题策略.与已有方法比较,该方法不仅提高了题库测验精度,而且在项目使用均衡性上也表现优异.     

Rapid solidification of acoustically levitated Al-Cu-Si eutectic alloy under laser irradiation

Al-27%Cu-5.3%Si ternary eutectic alloy was melted using a YAG laser and then solidified while being acoustically levitated. A maximum undercooling to 195 K (0.24 TL) was achieved with a cooling rate of 76 K/s. The solidification microstructure was composed of (Al+θ+Si) ternary eutectics and (Al+θ) pseudobinary eutectics. During acoustic levitation, the (Al+θ+Si) ternary eutectics are refined and the (Al+θ) pseudobinary eutectics have morphological diversity. On the surface of the alloys, surface oscillations and acoustic streaming promote the nucleation of the three eutectic phases and expedite the cooling process. This results in the refinement of the ternary eutectic microstructure. During experiments, the reflector decreases with increasing alloy temperature, and the levitation distance always exceeds the resonant distance. Because of the acoustic radiation pressure, the melted alloy was flattened, and deformation increases with increasing sound pressure. The maximum aspect ratio achieved was 6.64, corresponding to a sound pressure of 1.8×104 Pa.     

缺失数据的估计方法及应用

应用EM算法的思想在双参数逻辑斯蒂克模型下对存在缺失数据的参数估计方法和恢复缺失数据的统计插补方法进行研究.蒙特卡洛模拟和实证研究结果表明,在进行统计插补恢复缺失数据时,该方法使得估计结果比较理想:联合极大似然估计与EM算法相结合,先估计参数,再填补缺失值,再估计,再填补,直到似然函数值稳定.     

DNA damage stress induces the dissociation of Smurf1/2 from MDM2 in a slow manner

The tumor suppressor p53 locates at the key point of cell growth or apoptosis balance, and the expression level of p53 is tightly controlled by ubiquitin ligases including MDM2. Upon DNA damage stresses, p53 was accumulated and activated, leading to cell cycle arrest or apoptosis. We previously showed that Smad ubiquitylation regulatory factor 1/2 (Smurf1/2) promotes p53 degradation by interacting with and stabilizing MDM2, and consequently enhancing MDM2-mediated ubiquitylation of p53. However, it is uncle...     

Gastric vagal afferent inputs reach the glycemia-sensitive neurons of lateral hypothalamic area in the rat

The lateral hypothalamic area (LHA) is one of the most important central areas in the regulation of feeding behavior[1]. The glycemia-sensitive neurons within the LHA sense the blood glucose level and subsequently trig-ger various visceral and somatic responses for maintaining the homeostasis of blood glucose concentration. Some electrophysiological studies have demonstrated that the gastric vagal afferent inputs could reach the LHA in the cat[2,3], but the studies did not reveal whether th…     

基于MapReduce的粒子群投影寻踪模型的设计与实现

利用MapReduce模式设计并实现了粒子群投影寻踪算法的并行化,以提高算法的效率.在分类阶段使用了基于MapReduce的KNN分类算法并行,实验结果表明:基于MapReduce实现的粒子群投影寻踪模型能够有效地寻找到较好的投影方向,确保分类效果;并且与其串行算法相比,在实现效率上有较大的提高.