口服微囊藻对泥鳅的亚慢性毒性效应

旨在研究微囊藻水华对鱼类的生态毒性及其机理.采用饲喂微囊藻水华浮沫的暴露方法对泥鳅进行口服暴露28 d,剂量为经腹腔注射微囊藻细胞抽取物LD50的1/10[即75 mg细胞抽提物/(kg.体重.d),约为10μgMC-RR/(kg.体重.d)].生长测定结果表明,饲喂微囊藻明显抑制泥鳅的生长,但没有改变实验鱼的肝体比.透射电镜观察发现,实验鱼肝细胞结构有明显的改变,细胞器受到损伤.所观察到的超微结构变化主要是内质网膨胀、细胞核变形等,但线粒体结构没有明显变化.显微观察还发现了脾细胞结构的变化,说明微囊藻毒素对泥鳅脾脏也有损伤作用.蛋白磷酸酶抑制测定法检测发现,受试泥鳅肌肉中没有微囊藻毒素的积累,可能是由于低剂量的微囊藻毒素暴露没有引起生物富集作用.     

基于仪器钻进系统的风化花岗岩地层界面识别

针对香港风化花岗岩场址勘探,在液压旋转钻机上安装钻孔过程监测系统(drilling process monitoring,DPM),对有效轴压力、钻具转速、冲洗压力、钻头位移及穿孔速率进行了实时监测.采用变斜率作为显著性指数,对地层中的主、次界面进行了识别.t检验表明,DPM系统对岩土界面识别的置信度为99%.此外,对穿孔参数在界面处的变化分析表明,这些参数随孔深的变化曲线在界面处存在不同涨落,轴压力和穿孔速率对界面上岩石强度变化的响应度为81.82%.     

Indexing large moving objects from past to future with PCFI

In moving object database, the moving objects' current position must be kept in memory, also to the trajectory, in some case, as same as the future. But the current existing indexes such as SEB-tree, SETI-tree, 2+3R-tree, 2-3RT-tree and etc. can only provide the capability for past and current query, and the TPR-Tree, TPR*-Tree and etc.can only provide the capability for current and future query. None of them can provide a strategy for indexing the past, current and also the future information of moving objects.In this paper, we propose the past-current-future Index (PCFI-Index) to index the past,current & future information of the moving objects. It is the combination of SETI-tree and TPR*-tree, the SETI liking index is used for indexing the historical trajectory segments except the front line structure, and the moving objects' current positions, velocities are indexed via the in-memory frontline structure which mainly implemented with TPR*-tree.Considering the large update operations on TPR-tree of large population, a hash table considering cache sensitivity is also introduced. It works with the frontline part, leading a bottom-up update of the tree. The performance analysis proves that the PCFI-index can handle most of the query efficiently and provides a uniform solution for the trajectory query, time-slice query, internal query and moving query.     

Assessment of Deformation of Shear Localized Chip in High Speed Machining

As the cutting speed goes higher, the mechanism of chip deformation will be changed significantly, i.e., continuous chip in low cutting speed will shift to serrated chip with shear localization. For the shear localized chip, the parameters used to assess the chip deformation for continuous chip, such as shorten coefficient ξ, shear angle φ and shear strain ε, can not describe the chip deformation correctly or comprehensively. This paper deals with the assessment of chip deformation of shear localization. Th...     

Distributed location-based query processing on large volumes of moving items

Recently,new techniques to efficiently manage current and past location information of moving objects have received significant interests in the area of moving object databases and location-based service systems. In this paper,we exploit query processing schemes for location management systems,which consist of multiple data processing nodes to handle massive volume of moving objects such as cellular phone users. To show the usefulness of the proposed schemes,some experimental results showing performance factors regarding distributed query processing are explained. In our experiments, we use two kiids of data set：one is generated by the extended GSTD simulator and another is generated by the real-time data generator which generates location sensing reports of various types of users having different movement patterns.     

Advances in simulated modeling of vibration systems based on computational intelligence

Computational intelligence is the computational simulation of the bio-intelligence, which includes artificial neural networks, fuzzy systems and evolutionary computations. This article summarizes the state of the art in the field of simulated modeling of vibration systems using methods of computational intelligence, based on some relevant subjects and the authors' own research work. First, contributions to the applications of computational intelligence to the identification of nonlinear characteristics of packaging are reviewed. Subsequently, applications of the newly developed training algorithms for feedforward neural networks to the identification of restoring forces in multi-degree-of-freedom nonlinear systems are discussed. Finally, the neural-network-based method of model reduction for the dynamic simulation of microelectromechanical systems (MEMS) using generalized Hebbian algorithm (GHA) and robust GHA is outlined. The prospects of the simulated modeling of vibration systems using techniques of computational intelligence are also indicated.     

5 种两栖爬行动物首次在广东省发现

记述了广东省两栖动物新记录2种：大花角蟾Megophrys giganticus、黑眼睑小树蛙Phylautus gracilipes以及爬行动物新记录3种：半叶趾虎独山亚种Hemiphylodactylus yunnanensis dushangnensis、广西后棱蛇Oligodon guangxinsis、侧条后棱蛇Oligodon Lateralis、半叶践虎属Hemiphylodactylus亦为广东省新记录．     

A computational-intelligence-based optimization of agents'' initial positions in land combat simulation

The optimization of agents' initial properties enables agents to perform their assigned tasks more perfectly. This paper presents an optimizing method using the combination of radial basis function (RBF) neural network and genetic algorithm (GA). In the land combat simulation, the method can ensure that the agents optimized defeat the agents not optimized absolutely. Compared with the optimization based on support vector machines (SVM), the proposed method improves the efficiency more than twenty times, so it suits the cases where the speed as well as performance is required.     

单桩非线性分析的半解析半数值方法（英）

提出了一种半解析半数值方法，该方法可用于计算埋置于多层土中单桩的荷载位移非线性分析，在本文中，采用了两种理论模型来构造单桩的传递函数，第一种模型为双曲线模型，用于计算桩土界面处的剪尖力与其相对位移的非线性关系，第二种模型为Randolph所提出的理论解，用于确定桩周土中的剪应力和位移场，对现场试验结果和有限元分析结果进行了比较后说明，按本文所建议的方法所得的三种计算结果（荷载位移曲线，证明了本文所提方法的可靠性和准确性，此外，根据本文所提的构造传递函数的方法，考虑对桩，桩对土，承台对桩的相互影响，可以构造出考虑桩－土－台共同作用的传递函数，近而可以计算分析桩－土－台共同作用。