Improved results on the probabilistic theory of the joint linear complexity of multisequences

We improve previous results on the asymptotic behavior and the expected value of the joint linear complexity of random multisequences over finite fields.These results are of interest for word-based stream ciphers in cryptology.     

Gellan Gum（激冷胶）中酰基含量的测定

根据微生物多糖分子链长，空间结构复杂的特点，研究了ＧｅｌｌａｎＧｕｍ酰基含量测定时的样品，反应时间，反应温度，反应方式及体系ｐＨ的影响，得出最佳的反应条件：ｐＨ４，２５℃～３０℃，放置１２ｈ以上；或５０℃温度震荡３０ｍｉｎ，两法的标准偏差分析为０．００８２和０．００６３。     

基于设备功能的智能变电站二次设备状态评估方法研究

当智能变电站发生故障/告警时,二次系统网络中数据量异常庞大,此时快速、准确的定位到故障/告警位置,查找到故障原因是十分困难的。一般的二次设备状态评估方法以物理设备性能为指标并利用算法进行指标评价,并未对设备中的逻辑模型进行评估。文章利用设备中的逻辑模型建立了功能集合与评价逻辑设备功能的指标体系,并以影响功能的影响因子作为触发计算的条件,完成判别功能状态的逻辑矩阵。实例证明该方法对故障判别与查找有很大的帮助。     

胶带秤控制仪表的优化设计

针对影响电子胶带秤计量精度的主要因素问题,分析了控制仪表的设计方案,提出了一个高性能、低成本的电子胶带秤控制仪表的优化设计方案。具体地描述了仪表的输入通道、输出通道的优化设计方法,其中包括采用CPLD器件实现的测速环节,称重通道中有V/F变换器件实现的A/D转换的新算法。该A/D转换算法在保证A/D转换精度的前提下,提高了转换速率,使仪表的性能进一步提高,以适应高速、大运量的胶带输送机的物料计量和调节。     

Simulation of texture evolution and deformation mechanism in Mg-3Al-1Zn alloy during uniaxial compression

The effects of starting texture on he flow curves, and microstructure and texture evolutions of AZ31(Mg-3Al-1Zn-0.3Mn in wt.%) alloy during uniaxial compression at room temperature have been investigated by experiments and simulations. Two kinds of cylindrical compression samples were cut from the AZ31 extruded rod: one was cut with the compression direction parallel to the extruded direction(ED), and the other was cut with the compression axis perpendicular to the ED. The samples were termed as C//ED sample and C⊥ED sample, respectively. The results indicate that the general characteristics of flow curves and texture evolutions in both C⊥ED and C//ED samples during compression can be well explained by the relative activities of deformation mechanisms, which show a strong orientation dependence on the initial textures and the current texture. A significant yield behavior can be induced by {10-12} twinning at the starting deformation, and the lower yield stress in C⊥ED sample can be enhanced by the high activity of basal a slip. The work hardening behavior is related to the activities of basal slip, pyramidal c+a slip, {10-12} twinning, as well as {10-11} twinning. However, the activity of prismatic a slip is insensitive to the starting texture, and mostly negligible in all samples.     

贮氢合金Mm（NiCoMnAl）5的不同制备方法对MH/Ni电池性能的影响

研究了采用悬浮熔炼（常规铸态）和不同冷却速度的单辊快淬方法制备的Mm（NiCoMnAl）5型稀土系贮氢合金负极活性材料对金属氢化物镍（MH/Ni）电池性能的影响.结果表明,采用不同方法制备的合金对整个电池活化后的容量和内阻影响很小,但是常规铸态合金在退火后降低了电池的放电电压平台,快淬合金随着冷凝速率的提高,放电平台呈降低趋势.对循环充放电过程中电池内阻、循环到一定次数时负极贮氢合金的粒度和正极内铝含量的测试结果表明,铸态不退火合金较差的抗粉化性和较差的耐腐蚀性使电池的循环性能较差,经退火后其性能均有所提高,快淬合金使电池的循环性能优于常规铸态合金.     

Far ultraviolet auroral imager

Reviewing the technology development of imaging the global FUV auroral morphology, we introduce a space-based FUV auroral imager prototype developed by the Center for Space Science and Applied Research (CSSAR). It is designed to obtain continuous observations on the temporal and spatial morphology of the aurora which occupies highly elliptical high-altitude near-polar orbits. Primarily composed of a telescope system, image intensifier system, CCD, and collection and control system, the instrument works in the spectral region from 140–190 nm in the field of view 25°×25°, and the spatial resolution is better than 0.1°.     

氧化钛添加量对微晶玻璃系统中晶化过程及材料性能的影响

用ｘ－ｒａｙ衍射分析，差热分析及扫描电镜等方法，探讨了氧化钛添加量对基础玻璃的晶化速率，晶相组成与微观结构以及微晶下班部分性能的影响。结果表明：添加适量的氧化钛将形成中间相，通过中间相诱导析晶，可降低基础上化温度，提高晶化速率。在所研究的ＣａＯ－Ａｌ２Ｏ３－ＳｉＯ２系统中，氧化钛的最佳添加量的１０ｗｔ％。     

线性规划在露天配矿中的应用

通过线性规划方法,结合matlab软件实现目标函数的求解,得到了露天矿山的合理配矿,稳定了露天矿山矿石品位,合理利用矿山废石资源,在同等条件下,取得矿山企业的最低成本,以达到矿山最大利益。     

A quality control method for complex product selective assembly processes

Selective assembly is an important step during the manufacturing process for a complex product to meet precision requirements. The high precision requirement of complex product often results in producing a large number of surplus components in selective assembly process current practices. In this paper, we develop a comprehensive model which permits the integration of machining process parameters design, variation analysis and fault diagnosis, process adjustment and control strategy, process capability index calculation and matchable degree calculation. The model can be applied to evaluate and improve product, process and system design at early development stages, or support the improvement of matchable degree for a complex production selective assembly process. In this model, we have introduced a navel concept of general matchable degree for a multiple components selective assembly process. The implementation procedure and functional modules of the proposed model are given in details with an industrial case presented to illustrate the implementation of the proposed method.