一类非光滑Chua’s电路的同步控制

本文研究两个带x|x|非线性项的Chua’s电路的全局指数同步和全局同步的控制问题.证明这两个系统在未加控制时不可能同步,但设计不同的控制器可以实现这两个系统的全局指数同步和全局同步.     

基于能量原理确定系泊碰撞载荷的有限元法

准确地确定出船舶系泊时的撞击载荷, 对船舶及海洋平台的强度研究都是极其重要的. 提出了通过能量原理和有限元分析确定系泊撞击载荷的方法. 碰撞时, 动能和变形能满足能量守恒, 动能是包括附连水质量在内的船体总动能, 此动能在撞击时转化为变形能, 根据变形能与载荷的关系, 求出碰撞载荷. 通过具有碰撞载荷理论解的梁的验证, 表明该方法是完全可行的. 为实际工程提供了确定护舷撞击力的理论依据和计算方法.     

FEB氦灰问题研究

本文从现有的氦灰输运和排除的实验数据出发，计算了ＦＥＢ的氦灰积累速率，得到了平衡氦灰浓度，另外，从α粒子平衡方程和等离子体功率平衡方程出发得到的结果与直接从实验数据计算得到的结果相一致。最后，用二维Ｍｏｎｔｅ－Ｃａｒｌｏ程序模拟了排灰效率与偏滤器工程结构参数和靶板附近的等离子体参数之间的敏感性关系。     

多块YBaCuO高温超导体在永磁轨道上的悬浮力

】报道了多块 YBa Cu O高温超导体块材的不同组合方式在永磁轨道上的磁悬浮力的实验研究结果 ,实验研究证明不同的组合方式对其悬浮力的影响较大。作者分别研究了四块 YBa Cu O高温超导体块材以不同的组合方式在永磁轨道上的悬浮力 ,并进行了分析比较 ,为高温超导磁悬浮车的设计提供了初步的实验依据     

Highly stable Al-doped ZnO by ligand-free synthesis as general thickness-insensitive interlayers for organic solar cells

Highly conductive and dispersible Al-doped ZnO (AZO) nanoparticles (NPs) have been successfully prepared by ligand-free colloidal synthesis at low temperature and stabilization by surfactant-aid including ethanolamine (EA), ethylenediamine (EDA), diethylenetriamine (DETA) and triethylenetetramine (TETA). Due to the strong intermolecular hydrogen-bonding interactions between AZO NPs and the amino groups from surfactants, the inevitable aggregation was suppressed and the surface defect sites were passivated obviously. The existence of electron transfer from the nitrogen of the amino groups to the zinc of AZO, led to a dramatic increase in electrical conductivity. A homogeneous current intensity value up to ～2200 pA for AZO tread by DETA was characterized by conductive atomic force microscopy (C-AFM), which was more superior than that of the reported sol-gel synthesized AZO with the assistance of EA surfactant (refer to 170.7 pA). Furthermore, non-fullerenes solar cells based on PBDB-T:ITIC with AZO-DETA (80 nm) yielded a best device efficiency of 10.7% and kept up prominent PCE exceeding 10% even with more thicker interlayer (95 nm).     

FEB—E氚循环系统的计算机模拟

对聚变实验增殖堆（ＦＥＢ）工程概要设计的氚燃料循环构造了一个动态子系统模型，研制了模拟氚燃料循环系统的计算机程序ＳＷＩＴＲＩＭ，计算运行一年后１０个子系统中的氚投料量和整个推系统总的氚投料量，这对预示起动一个聚变热功率的１５０ＭＷ量级的实验增殖堆所需的最少初始氚投料量有参考价值，计算结果表明，要求的最少初氚贮备量除了与燃料气体净化系统和同位互分离系统中氚的平均逗留时间有关外，还与包层液态锂中提取氚     

泡沫铝填充薄壁圆管的三点弯曲实验的数值模拟

泡沫金属填充薄壁结构的应用日趋广泛,建立合理的数值计算模型对结构设计和工程应用非常重要.该文通过对泡沫铝填充薄壁铝合金圆管的三点弯曲实验的数值模拟,研究了它的力学行为.采用ABAQUS软件,建立了空管和泡沫铝全填充管的有限元模型,并对这两种结构在三点弯曲下的力学行为进行了数值模拟,所得结果与实验结果符合得较好.通过数值模拟分析了结构的承载机理和不同压头直径对结构承载能力的影响.此外,还研究了泡沫铝部分填充圆管的三点弯曲行为,分析了不同填充长度对结构承载能力的影响.     

中国的国家长度基准：稳定在^127I2超精细结构上的633nm He－Ne激光（续）－－现代计量科学专题之三

4新一代碘稳频激光系统 进入20世纪90年代以来,由于技术的不断进步,在计量学领域,633nm稳频He-Ne激光被广泛使用.基于三次微分技术的碘稳频He-Ne激光除了在传统意义上用于计量标准的目的外,也开始进入到一些有特殊精度要求的测量系统中.     

Existence and stability of circular orbits in general static and spherically symmetric spacetimes

The existence and stability of circular orbits (CO) in static and spherically symmetric (SSS) spacetime are important because of their practical and potential usefulness. In this paper, using the fixed point method, we first prove a necessary and sufficient condition on the metric function for the existence of timelike COs in SSS spacetimes. After analyzing the asymptotic behavior of the metric, we then show that asymptotic flat SSS spacetime that corresponds to a negative Newtonian potential at large r will always allow the existence of CO. The stability of the CO in a general SSS spacetime is then studied using the Lyapunov exponent method. Two sufficient conditions on the (in)stability of the COs are obtained. For null geodesics, a sufficient condition on the metric function for the (in)stability of null CO is also obtained. We then illustrate one powerful application of these results by showing that three SSS spacetimes whose metric function is not completely known will allow the existence of timelike and/or null COs. We also used our results to assert the existence and (in)stabilities of a number of known SSS metrics.     

工业用涤纶纤维的熔融行为与某些结构参数关系的研究

用ＤＳＣ法研究了国内外不同厂家生产的工业用ＰＥＴ纤维的熔融行为,其热谱表明,一般呈现熔融双峰．实验证明,双熔融峰是由ＤＳＣ过程中纤维材料中一部分热稳定性差的结构发生重排所致．结合用ＷＡＸＤ法、ＳＡＸＳ法、双折射法、密度法获得的结构参数指出,工业用纤维的熔融行为,除受晶粒尺寸、晶粒完善程度、晶粒尺寸分布等因素的影响之外,连续网的结构也起着重要作用．另外,用ＤＳＣ法测定工业用纤维结晶度的精度还有不如人意之处．