STABILITY OF THE HIGH-ORDER BAM AND ITS PERFORMANCE ANALYSIS

由Ｔａｉ提出的高阶双向联想存储器（ＨＯＢＡＭ）推广了Ｋｏｓｋｏ的ＢＡＭ，它不仅拥有ＢＡＭ的优点，而且放宽了连续性假定以得到可靠的回忆，并大大改进了ＢＡＭ的存储容量和纠错性能。然而，Ｔａｉ对于ＨＯＢＡＭ的性能分析仅限于计算机模拟，并没有给出理论分析结果。本文填写了此方面空白，并给出ＨＯＢＡＭ稳定性和存储容量的理论证明，使得该系统能从理论上得以保证所有训练模式对成为其稳定点。     

光折变晶体多重存储实验研究

本文首先讨论了在光折变晶体同一体积内复用多幅全息图的等衍射效率记录方法 ,即递减时间曝光方法。然后采用这种曝光方法 ,分别以掺杂为 0 .0 3 %的Fe :LiNbO3和双掺杂晶体Zn :Fe:LiNbO3为存储介质 ,以Δθ=ΔΘ(ΔΘ =0 .0 94°)为复用角度间隔 ,存储了 12个字母 ,并再现出了清新的图像。     

IBM3880,3803在两台IBM4341主机中的共享

IBM3880是磁盘存贮控制器,IBM3803是磁带控制器。本文介绍了3880,3803作为两台IBM 4341主机共享外设的意义,分析讨论了这两种设备的结构原理及共享实现方法。     

双通道高速实时大容量数据采集存储系统

研究了多通道高速实时大容量数据采集存储系统，采用ＦＩＦＯ和多微机，多硬盘了列存储技术，实现了在每通道达２０ＭＨｚ采样速度的情况下，对Ｉ，Ｑ两个通道同是地采集存储数据量达１０００Ｍｂｙｔｅ的高速实时大容量数据采集存储系统。     

密封用硅橡胶老化过程宏观微观特性相关性

开展了密封用某型硅橡胶胶片试件的热空气加速老化试验,对不同等当老化年份下的试件进行了单向拉伸测试和元素分析,获得了老化过程中应力应变数据以及关键元素浓度变化数据;在不同等当老化年份下宏观力学性能及微观化学数据分析的基础上,研究了本构参数与等当老化时间的函数关系以及老化效应与等当老化时间的函数关系,进而建立了宏观力学行为与微观化学变化的相关性模型。某硅橡胶密封圈的应用表明,基于宏观、微观相关性的本构参数插值,应力应变数据与同批次材料100%应变范围内的最大偏差约为7.6%。     

风储孤网系统小干扰稳定性分析研究

从电力系统运行的一般原理出发,开展风储孤网系统小信号稳定和动态稳定的研究,保障局部地区供电可靠性。基于特征值分析法和李亚普诺夫线性系统稳定性判据,对风储孤网系统小干扰稳定性问题进行了研究。提出风储孤网系统储能单元基于下垂控制模式的储能逆变器控制策略,并根据风储孤网系统各模块的控制策略建立相应的数学模型；基于特征值分析法进行风储孤网系统各模块数学模型的小干扰稳定性分析,并根据李亚普诺夫线性系统稳定性判据进行风储孤网系统的稳定性判断；基于MATLAB/Simulink仿真平台搭建风储孤网系统仿真模型,通过仿真验证了风储孤网系统能够实现稳定运行,与小干扰稳定性分析得出的结论一致。研究成果可为风储孤网系统的运行稳定性研究提供理论参考。     

Soil carbon distribution and site characteristics in hyper-arid soils of the Atacama Desert: A site with Mars-like soils

The soil carbon content and its relation to site characteristics are important in evaluating current local, regional, and global soil C storage and projecting future variations in response to climate change. In this study we analyzed the concentration of organic and inorganic carbon and their relationship with in situ climatic and geological characteristics in 485 samples of surface soil and 17 pits from the hyper-arid area and 51 samples with 2 pits from the arid–semiarid region from the Atacama Desert located in Peru and Chile. The soil organic carbon (SOC) in hyperarid soils ranged from 1.8 to 50.9 μg C per g of soil for the 0–0.1 m profile and from 1.8 to 125.2 μg C per g of soil for the 0–1 m profile. The analysis of climatic (temperature and precipitation), elevation, and some geologic characteristics (landforms) associated with hyper-arid soils explained partially the SOC variability. On the other hand, soil inorganic carbon (SIC) contents, in the form of carbonates, ranged from 200 to 1500 μg C per g of soil for the 0–0.1 m profile and from 200 to 3000 μg C per g of soil for the 0–1.0 m profile in the driest area. The largest accumulations of organic and inorganic carbon were found near to arid–semiarid areas. In addition, the elemental carbon concentrations show that the presence of other forms of inorganic carbon (e.g. graphite, etc.) was negligible in these hyperarid soils. Overall, the top 1 m soil layer of hyperarid lands contains ∼11.6 Tg of organic carbon and 344.6 Tg of carbonate carbon. The total stored carbon was 30.8-fold the organic carbon alone. To our knowledge, this is the first study evaluating the total budget carbon on the surface and shallow subsurface on ∼160,000 km² of hyperarid soils.     

采用开关磁阻电机系统的电动摩托研究

电动车辆是融多学科为一体的高科技产物,发展速度不断加快,本文对电动摩托车的总体设计进行了研究,并针对电动摩托车的特点提出了一种开关磁阻电机驱动系统（ＳＲＤ）方案,该开关磁阻电机采用８／６结构,其优点是容易再生制动,效率较高,起动力矩大,可靠性较好。额定功率为１ｋＷ,向驱动系统提供动力的是两只１２Ｖ３６Ａｈ的铅酸蓄电池,控制器以８０Ｃ１９６ＫＢ单片机为核心,在对ＳＲＤ充分研究的基础上,完成了电动摩托     

鲁棒稳定性分析及其在飞行颤振试验中的应用

结合国内外的研究现状和工程应用需要,基于控制理论利用结构奇异值μ分析法将设计理论模型数据和实测试飞数据结合起来,可以在飞行试验过程中进行颤振边界预测,直接给出保守的颤振临界动压或者颤振临界速度,从而能够增加试验的安全性、缩短试飞周期、减少试验点并节省试验经费,是目前颤振试飞方法的有益补充.     

Viability of barley seeds after long-term exposure to outer side of international space station

Barley seeds were exposed to outer space for 13 months in a vented metal container without a climate control system to assess the risk of physiological and genetic mutation during long-term storage in space. The space-stored seeds (S0 generation), with an 82% germination rate in 50 seeds, lost about 20% of their weight after the exposure. The germinated seeds showed normal growth, heading, and ripening. The harvested seeds (S1 generation) also germinated and reproduced (S2 generation) as did the ground-stored seeds. The culm length, ear length, number of seed, grain weight, and fertility of the plants from the space-stored seeds were not significantly different from those of the ground-stored seeds in each of the S0 and S1 generation. Furthermore, the S1 and S2 space-stored seeds respectively showed similar β-glucan content to those of the ground-stored seeds. Amplified fragment length polymorphism analysis with 16 primer combinations showed no specific fragment that appears or disappears significantly in the DNA isolated from the barley grown from the space-stored seeds. Though these data are derived from nine S0 space-stored seeds in a single exposure experiment, the results demonstrate the preservation of barley seeds in outer space for 13 months without phenotypic or genotypic changes and with healthy and vigorous growth in space.