Shape blending of artistic brushstroke represented by disk B-spline curves

This paper presents an algorithm for automatically generating in-between frames of two artistic brushstrokes. The basic idea of the algorithm is to represent the two key frames of artistic brushstrokes in disk B-spline curves, and then make blending of their geometric intrinsic variables. Given two key frames of artistic brushstrokes, the skeleton curves can be obtained by certain skeleton-based techniques. After disk B-spline representation of the key frames is generated, interpolation of the intrinsic variables of the initial and the target disk B-spline curves is carried out. Examples show that this method can efficiently create in-between frames of artistic brushstrokes.     

High variability of the gvpA-gvpC region in Microcystis

Gas vesicles provide buoyancy to Microcystis and other common cyanobacterial bloom-forming species. gvpA and gvpC are structural genes encoding gas vesicle proteins. Phylogenetic analyses of 10 Microcystis strains/uncultured samples showed that gvpC and each intergenic segment of the gvpA-gvpC region can be divided into two types. The combination of different types of gvpC and intergenic segments is an important factor that diversifies this genomic region. Some Microcystis strains isolated in China possess a 172 to 176 bp sequence tag in the intergenic segment between gvpA and gvpC. The gvpA-gvpC region in Microcystis can be divided into at least 4 classes and more numbers of subclasses. Compared to rbcLX and other regions, the high variability of the gvpA-gvpC region should be more useful in identifying geographical isolates or ecotypes of Microcystis.     

Exchange-coupling interaction, effective anisotropy and magnetic property of nano-magnetic materials

The theories and models of exchange-coupling interaction between grains in nanocrystalline magnetic materials are introduced here. Their insufficiencies and distinctions from the experimental results are pointed out, and some revisions are made. The effects of the phase component ratio, the grain size and microstructure on the effective anisotropy and magnetic properties in the nanocomposite permanent materials and the improved models are discussed in detail.     

Research on the Bit Computation Model for Time Variable Channel Bandwidth

For the encoding bit-rate problem in H.264 wireless video communication,this paper analyzes the bit-rate computation model and the Mean Square Error distortion model,establishes the relation between the quantization parameter of the encoding bit-rate and the intra frame refresh rate of the macro block,and put forward a new ideal about the coding rate on the basis of general binomial computation model theory. Furthermore,this method not only can adaptively adjust the bit allocation and quantization parameter and prevents buffer from overflowing downward or upward under given network bandwidth,but also can apply the rate-distortion to optimize the solution method,control the encoding bits accurately and optimizes the allocation between the intra and inter frame encoding macro block.     

经热处理的Fe_(50)Cu_(50)亚稳合金的电阻特性研究

采用机械合金化方法制备了Ｆｅ５０Ｃｕ５０亚稳合金粉末，压制成片状后分别在２５０℃、６００℃进行了热处理，对热处理后的样品进行了低温电阻测量。结果表明，样品的电阻表现为负的温度系数，且经２５０℃热处理的Ｆｅ５０Ｃｕ５０样品表现出比６００℃热处理的样品更大的负温度系数．     

Research on agile space emergency launching mission planning simulation and verification method

Space emergency launching is to send a satellite into space by using a rapid responsive solid rocket in the bounded time to implement the emergency Earth observation mission.The key and difficult points mainly include the business process construction of launching mission planning, validation of the effectiveness of the launching scheme, etc. This paper proposes the agile space emergency launching mission planning simulation and verification method, which systematically constructs the overall te...     

地空量子通信流程构建及策略分析

针对预警机的地空量子通信问题，首先对影响其传输信道的主要因素进行了分析。基于分析结果，构建一地空量子通信流程，可使地面站与预警机在双向对准和跟踪后进行量子态的无线传输；基于该通信流程搭建一地空量子广域网，网络由空中平台和地面通信端等设备组成，根据不同的通信节点剖析3种路由策略，验证其可行性；最后对量子比特传输错误率进行分析，仿真结果表明通过提高信道系数，缩小测量基的偏差角度以及减少纠缠交换、经典信息引起的差错率，可有效减小传输的误码率。     

由史入论 由论及史——谈对《美术概论》教材的使用

以王宏建、袁宝林二教授主编的《美术概论》在教学中如何使用,才能体现编者者的意图,才能使教材的理论内容、结构体系及论证特点得到很好贯彻,作者采用“由史入论、由论及史、史论结合”的讲授方法,做了有益探索。     

多重事件触发机制下四旋翼飞行器的姿态跟踪控制

为减少四旋翼飞行器姿态跟踪控制中内部计算与通信资源的损耗,提出了基于反步法和多重事件触发机制下的四旋翼飞行器姿态跟踪控制。建立了四旋翼飞行器的动力学模型,并以滚转角系统为例,利用反步法设计连续控制器,实现了飞行器滚转角对参考信号的跟踪控制;通过引入事件触发机制构造了事件触发控制器,基于Lyapunov稳定性理论证明了所设计的事件触发控制器可以使滚转角系统保持稳定,且避免了Zeno现象;同时,在不同的参数作用下,采用相同方法对四旋翼飞行器的其他3个系统分别设计了各自对应的事件触发机制和事件触发控制器;由此构建的4个事件触发机制共同构成了四旋翼飞行器的多重事件触发机制。仿真结果表明,在多重事件触发机制作用下,所提事件触发控制器在3 s内共触发150次即可达到与周期采样控制器连续采样3 000次相同的跟踪效果。