An information-theoretic evaluation of narrative complexity for interactive writing support

Narrative complexity should be managed systematically during the creation process because it heavily influences the levels of understanding and the interest of recipients. Existing research has tended to depend on impressionist criticism or to deal with narrative complexity at general and superficial levels. In this paper, we consider the creation and acceptance of narrative as information processing mediated by a narrative text. Under this assumption, we propose a method to quantitatively evaluate narrative complexity at the recipient's cognitive level, and to effectively utilize the evaluation to aid in the author's narrative creation process. Within our knowledge distribution model, a narrative is represented as a knowledge structure, and the knowledge state and knowledge flow of narrative agents are evaluated using a probabilistic reasoning model. From the knowledge flows, the amount of information processed and required by the recipient is calculated as a measure of the narrative complexity using entropy theory. As a case study, we conduct a comparative analysis of an actual cinematic narrative and a structurally manipulated version of that narrative to show how the method captures characteristics and changes of the narrative; we also discuss the improvements presented in this paper as compared to our previous research.     

基于VF信息管理系统的研究

随着科学技术的不断进步以及高等教育的普及,学校规模的不断扩大导致学生信息量也是很复杂繁多,而如果仍然采用传统式的学生信息管理方法就不可避免的浪费大量人力、物力和财力资源,而且不能满足当代中国教育的发展需求,现在这一问题已经成为势必要解决的问题。信息管理系统是一种融合管理科学、信息科学、系统科学、现代通信技术和电子计算机技术为一体的综合性先进管理手段。随着科学技术和管理系统无论在理论还是技术上的不断改进与完善,其所展现出的优势和进步空间充分说明了存在的必要性,有效地提高管理效率。     

Atomistic analyses of the effect of temperature and morphology on mechanical strength of Si–C–N and Si–C–O nanocomposites

3-D molecular dynamics (MD) analyses of SiC–Si₃N₄ nanocomposite deformation and SiCO nanocomposite deformation are performed at 300 K, 900 K, and 1500 K. In SiC–Si₃N₄ nanocomposites, distribution of second phase SiC particles, volume fraction of atoms in GBs, and GB thickness play an important role in temperature dependent mechanical behavior. The deformation mechanism is a trade-off between the stress concentration caused by SiC particles and Si₃N₄–Si₃N₄ GB sliding. The temperature increase tends to work in favor of GB sliding leading to softening of structures. However, microstructural strength increases with increase in temperature when GBs are absent. In the case of SiCO nanocomposites, findings indicate that temperature change dependent amorphization of nanodomains, the nanodomain wall placement, the nanodomain wall thickness, and nanodomain size are important factors that directly affect the extent of crystallinity and the strength against mechanical deformation.     

TFPI-1抑制作用的模型化研究

TFPI-1在凝血动力系统中起着重要的调节作用,主要对FV∏α-TF的抑制过程作用显著.根据生物学实验建立一个关于TFPI-1,FV∏α-TF和FXα等因子的凝血动力数学模型.通过对模型的分析和数值模拟得到了一些与临床医学及实验相吻合的结论,展现出模型化方法的重要作用及预测能力.     

复杂硐室交叉口转向挑顶施工力学行为研究

长大隧道的辅助坑道与正洞交叉段施工工序繁多,围岩易受到开挖扰动,进而产生失稳破坏。以伏牛山隧道为工程背景,借助有限元软件PLAXIS3D构建三维数值模型,模拟了辅助坑道进入正洞的施工过程,研究了小导洞转向挑顶施工及正洞反向台阶法开挖的施工力学行为与三维空间效应,分析了施工过程中围岩应力、拱顶沉降、洞周横向收敛位移及围岩塑性区演化规律。结果表明:横向通道交叉口段施工会导致交叉口附近风机房正洞围岩产生应力重分布,在正洞拱顶及右拱腰处形成拉应力,沿风机房纵向影响范围约为1倍洞径; 风机房拱顶最终沉降量为3.7～3.9 mm,在交叉口及其附近,以小导洞爬坡挑顶阶段和风机房正洞反向开挖通过时引起的拱顶沉降量最大,小导洞转向挑顶施工引起的拱顶总沉降量相对较小; 联络通道左侧进洞使得正洞左侧横向位移增加,进而导致正洞左右两侧横向位移呈现不对称分布; 交叉口处联络通道与风机房产生了连续的塑性区,塑性点主要在开挖侧壁,拱腰处最为集中,向上延伸至拱肩,拱脚处向下发展至一定深度; 针对小导洞扩挖施工过程中交叉口、上台阶侧壁、底面出现的少量受拉破坏点,施工中应对这些部位予以重点关注,及时施作初期支护,防止局部掉块。     

复合加载模式下海上风机圆形浅基础亚塑性宏单元模型

海上风机基础不但承受着上部结构传来的竖向荷载、风浪等引起的水平荷载与弯矩,还承受着叶片等旋转机构传来的扭矩。基于亚塑性本构理论框架,引入相应的圆形浅基础广义屈服面函数及塑性势函数,构建了一个六自由度复合加载模式下砂土地基上海上风机基础宏单元模型。为了能够合理描述循环加载条件下基础的宏观力学响应,该模型将等效粒间应变概念引入到广义力与其对应位移关系中。通过对已有模型试验结果的数值模拟,在一定程度上验证了提出的宏单元模型的合理性。     

Geometric and electronic structure of Cs adsorbed Ga0.5Al0.5As (001) and (011) surfaces: a first principles research

Using plane-wave ultrasoft pseudopotential method based on first-principles density functional theory, the adsorption of Cs atom on Ga_0.5Al_0.5As (001) and (011) surfaces is investigated. The adsorption energy, geometric structure, E-Mulliken bond population, charge-transfer index, work function, dipole moments, band structure and density of state of Cs/(001) and Cs/(011) systems are calculated, the stability, ionicity and electronic structure of Cs/(001) and Cs/(011) systems are compared. Result shows that (001) is more benefital for photoelectric activation and photoemission than (011).     

生物反应器培养金藻生产生物柴油技术初探

本实验将金藻用生物反应器在实验室条件下进行培养,并初步优化了乙醚石油醚法从一种金藻中提取油脂的方法。金藻中富含油脂,实验研究得出,用无水乙醚和石油醚混合溶剂在体积比2：1、温度20℃[1]、提纯时间5h以上的实验条件下萃取海藻中的脂肪质量最高。皂化过程选取甲醇作为溶剂要明显优于以乙醇作为溶剂的结果,实验确定采用KOH一甲醇作为皂化试剂。     

Efficient H2 production by photocatalytic water splitting under UV or solar light over variously modified TiO2-based catalysts

This paper focused for the first time on the comparison between three different approach to modify the chemico-physical properties of TiO₂-based photocatalysts and their effect in the H₂ production by photocatalytic water splitting both under UV and solar light irradiation, under the same experimental conditions. The application of pulsed laser irradiation to aqueous TiO₂ suspensions (first approach) induced structural transformations both on the bulk and on the surface of TiO₂, boosting the H₂ production, under UV light irradiation, of almost three times (20.9 mmol/g_cat·h) compared to bare TiO₂ (7.7 mmol/g_cat·h). The second strategy was based on a templating method to obtain TiO₂ with a macroporous structure to favour an efficient light absorption process inside the material pores, thus allowing a high H₂ production (0.64 mmol/g_cat·h) under solar light irradiation. This performance was further enhanced when the macroporous TiO₂ was coupled with CeO₂ or W (third approach). In the latter case the H₂ production increased to 0.72 mmol/g_cat·h for macroporous TiO₂CeO₂ and to 0.82 mmol/g_cat·h for macroporous TiO₂W. This work highlights how it is possible to tune the TiO₂ photocatalytic properties with easy and green procedures to obtain environmental friendly catalyst for hydrogen production.     

刺五加雌、雄花的花柱引导组织结构观察

利用光学显微镜、透射电子显微镜观察了刺五加(Eleutherococcus senticosus)雌、雄花的花柱及其引导组织的结构。结果表明:1.刺五加花柱处合生心皮内表面未完全融合,形成由中心向四周分支的裂缝;2.雌性花柱较雄性花柱,引导组织更为发达;3.发育过程中引导组织细胞内不断有储存为脂体的营养物质分解,并分泌到细胞间隙;4.传粉后,雌花花柱引导组织的部分细胞发生降解,形成大的溶生的细胞间隙,花粉管从中穿过,而雄花花柱中未见溶生的细胞间隙,亦未见花粉管穿过。