深地深海油气勘探用测井电缆铠装钢丝的研发

对深地深海油气勘探用测井电缆铠装钢丝进行了研发试制,结果表明:铠装钢盘条的微观结构为全片层的珠光体组织,未出现先共析铁素体、先共析渗碳体和马氏体等异常组织,轧制后的冷却工艺合理,抗拉强度为1623 MPa.盘条拉拔为钢丝后,珠光体中的片层渗碳体出现扭转、断裂现象,出现了颗粒状渗碳体的形貌,拉拔加工硬化使钢丝抗拉强度提高...     

基于复合熔盐低温制备片状α-氧化铝的研究

基于KCl-NaCl-AlF₃熔盐体系,采用氢氧化铝为铝源、以氯化钾（KCl）和氯化钠（NaCl）复合熔盐为反应介质、以氟化铝（AlF₃）为添加剂制备片状α-Al₂O₃。通过X射线衍射和扫描电子显微镜表征方法研究了氟化铝含量、煅烧温度和保温时间对片状氧化铝形貌和晶型的影响。结果表明,当氟化铝添加量（氟化铝与氢氧化铝的质量比）为5%、煅烧温度为750 ℃、保温时间为180 min时,可获得片状α-Al₂O₃,其径向尺寸约为5.1 μm,径厚比达18,分散性良好。     

Active Packaging System Based on Ag/TiO2 Nanocomposite Used for Extending the Shelf Life of Bread. Chemical and Microbiological Investigations

This study was carried out to assess the shelf life and microbiological safety of wheat bread during storage in a packaging system made of Ag/TiO₂ nanocomposite (Ag/TiO₂‐P) in comparison with bread packed in high density polyethylene (HDP‐P) and bread not subject to packaging (CS). The Ag/TiO₂ nanocomposite was prepared by sol–gel procedure, and its morphostructural characterization was performed by X‐ray diffraction, Fourier transform infrared spectroscopy and transmission electron microscopy. The Ag/TiO₂‐P was prepared via inclusion of nanocomposite between the polyethylene layers to avoid bread–nanocomposite contact. Chemical and microbial stability of bread expressed in terms of total fat, protein, sugar, lipid hydroperoxides and yeasts, moulds, and Bacillus subtilis and Bacillus cereus counts, respectively, was monitored for 6 days. Experimental data indicate that Ag/TiO₂‐P considerably extends the shelf life and microbiological safety of bread in comparison with HDP‐P and CS. A possible mechanism involved in the preservation of the bread is hypothesized. Copyright © 2014 John Wiley & Sons, Ltd.     

浅谈性能化防火设计在万达商业综合体中的应用

本文分析万达模式商业综合体的功能组合特点及其防火设计面临的难点与挑战,并结合工程实例介绍性能化防火设计在万达商业综合体工程中的应用。     

Distribution-free bounds for relational classification

Statistical relational learning (SRL) is a subarea in machine learning which addresses the problem of performing statistical inference on data that is correlated and not independently and identically distributed (i.i.d.)—as is generally assumed. For the traditional i.i.d. setting, distribution-free bounds exist, such as the Hoeffding bound, which are used to provide confidence bounds on the generalization error of a classification algorithm given its hold-out error on a sample size of N. Bounds of this form are currently not present for the type of interactions that are considered in the data by relational classification algorithms. In this paper, we extend the Hoeffding bounds to the relational setting. In particular, we derive distribution-free bounds for certain classes of data generation models that do not produce i.i.d. data and are based on the type of interactions that are considered by relational classification algorithms that have been developed in SRL. We conduct empirical studies on synthetic and real data which show that these data generation models are indeed realistic and the derived bounds are tight enough for practical use.     

前红松管胞螺纹加厚的立体观察

用扫描电镜立体观察的方法,对前红松Pinus prokoraiensis茎材进行不同切面的观察。清楚地看到了:在它的年轮晚材中,管胞螺纹加厚的立体结构。为前红松新种的发现及其解剖学研究提供了有力的证据和研究方法。     

Kick it with elasticity: Safety and performance in human–robot soccer

The RoboCup community has one definite goal [H. Kitano, M. Asada, RoboCup humanoid challenge: That’s one small step for a robot, one giant leap for mankind, in: IEEE/RSJ Int. Conf. on Intelligent Robots and Systems, IROS1998, Victoria, pp. 419–424, 1998]: winning against the human world soccer champion team by the year 2050. This implies real tackles and fouls between humans and robots, rising safety concerns for the robots and even more important for the human players. Nowadays, similar questions are discussed in the field of physical human–robot interaction (pHRI), but mainly in the context of industrial and service robotics applications.The first part of our paper is an attempt for a pHRI view on human–robot soccer. We take scenes from real soccer matches and discuss what could have happened if one of the teams consisted of robots instead of humans. The most important result is that elastic joints are needed to reduce the impact during collisions. The second and third part consider conversely, how the robot can handle the impact of kicking the ball and how it can reach the velocity of human-level soccer. Again joint elasticity is the key point.Overall, the paper analyzes a vision far ahead. However, all our conclusions are based on concrete simulations, experiments, derivations, or findings from sports science, forensics, and pHRI.     

多核环境下虚拟机VCPU调度研究:问题与挑战

虚拟机VCPU调度策略和机制是影响虚拟机系统性能的关键因素.由于虚拟机系统改变了传统的软件栈结构,简单地将传统操作系统中所采用的调度策略和算法移植到虚拟机监视器层用于虚拟机VCPU的调度,会导致虚拟机系统性能的偏离甚至严重下降,虚拟机系统下层的物理处理器采用多核结构更增加了虚拟机VCPU调度的复杂性.详细介绍并分析了虚...