美国标准机载计算机AN／AYK14分析及应用研究

系统地介绍了美国海军标准机载计算机AN／AYK-14的系统结构与组成，重点讨论了AN／AYK-14的发展历程和改进情况，揭示了美国标准机载计算机向开放式结构发展的方向，最后对AN／AYK-14的应用情况进行了简介。     

A systematic spatial bias in remembering eye positions

Categorical bias in location memory in geometric spaces is well established. The present study assessed the presence of the bias in locating eyes in images of human faces. Participants were presented with digital faces and indicated the position of one of the eyes in both upright and inverted orientations. Biases resulted from participants using multiple sources of accessible information. No differences were found for upright vs. inverted face images. Overall, the data were consistent with the retrieval category adjustment model. These distortions may be considered within the forensic context, when eyewitnesses work with a sketch artist or use a computer program to generate an image of the culprit.     

Al-4.5％Cu合金的过冷及凝固组织特征

对Ａｌ－４．５％Ｃｕ合金在纯石黑坩埚中用卤盐熔剂净化后的过冷度及其在金属锭模中的凝固组织特征进行了研究。实验结果发现：粘度较大的半固态熔剂对合金的净化作用较强,可使合金在金属锭模中得到６２℃的形核过冷度;金属熔体净化得到的热力学过冷度对合金形核及最终宏观组织的影响明显不同于激冷得到的动力学过冷度对其所产生的影响,在一定过冷度下,晶粒尺寸随热力学过冷度的增大而增大     

SMA 智能复合构件控制裂纹的数值与试验研究

将ＴｉＮｉ形状记忆合金（ＳＭＡ）薄带复合于基体材料内部,利用形状记忆合金的特性,可以控制构件裂纹的扩展。本文介绍了智能复合构件控制裂纹的机理,并利用拟温度载荷法,直接应用现有有限元程序对控制裂纹的ＳＭＡ智能复合构件进行了计算与分析,同时还进行了激光云纹干涉法试验测试。计算和试验结果表明智能复合构件中的记忆合金薄带对构件裂纹有显著的控制效果,同时计算和试验结果的一致性也表明本文的分析方法是可行的。     

等离子体处理对非晶态合金镀层表面改性研究

通过微波等离子体处理方法对Ni-W、Ni-W-B非晶态合金镀层表面进行改性的研究,测量了表面改性对非晶态镀层耐蚀性、表面成分及结构的影响.结果表明,经过微波等离子体处理过的Ni-W、Ni-W-B非晶态合金镀层,提高了在H₂SO₄、HNO₃溶液中的耐蚀性以及在700℃环境下的抗氧化性能;微波等离子体处理过的非晶态合金镀层表面含W量和含O量相对提高了;镀层结构仍然是非晶态.     

Rapid design and optimization of low-thrust rendezvous/interception trajectory for asteroid deflection missions

Asteroid deflection techniques are essential in order to protect the Earth from catastrophic impacts by hazardous asteroids. Rapid design and optimization of low-thrust rendezvous/interception trajectories is considered as one of the key technologies to successfully deflect potentially hazardous asteroids. In this paper, we address a general framework for the rapid design and optimization of low-thrust rendezvous/interception trajectories for future asteroid deflection missions. The design and optimization process includes three closely associated steps. Firstly, shape-based approaches and genetic algorithm (GA) are adopted to perform preliminary design, which provides a reasonable initial guess for subsequent accurate optimization. Secondly, Radau pseudospectral method is utilized to transcribe the low-thrust trajectory optimization problem into a discrete nonlinear programming (NLP) problem. Finally, sequential quadratic programming (SQP) is used to efficiently solve the nonlinear programming problem and obtain the optimal low-thrust rendezvous/interception trajectories. The rapid design and optimization algorithms developed in this paper are validated by three simulation cases with different performance indexes and boundary constraints.     

铝合金薄板零件橡皮囊成形屈曲分析与实验

为了抑制铝合金薄板类零件在橡皮囊成形后出现屈曲的缺陷,采用薄板屈曲微分方程对零件成形后的屈曲进行理论分析,并通过橡皮囊成形实验研究自然时效时间和成形压力对屈曲缺陷的影响。理论分析结果表明：零件法兰屈曲波数与其内外径比有关,通过改变法兰宽度进行实验验证,实验结果与理论分析结果相符;而成形实验结果表明,屈曲缺陷高度随板料自然时效时间的增加而增加,随成形压力的增加而减少。因此,理论分析结果有效,并且可通过减少淬火后成形时间和增加成形压力来抑制屈曲缺陷。     

Flash存储中的纠错编码

Flash闪存是一种非易失性的存储器件,随着工艺尺寸的不断减小,存储容量需求的不断增加,存储可靠性与寿命成为Flash生产与应用过程中最严重的两个挑战.基于多级 (MLC,Multilevel Cell) "与非(NAND)型" Flash的层级结构特征与读写操作特性,构造了一种基于正交映射的纠错编码方法,给出其编解码原理与结构,并分析其纠错能力.在此基础上,分析了该编码方法在Flash存储系统中的两种典型应用场景,即分布式多用户共享存储以及历史数据的无差错恢复.此外,Flash存储单元的可靠性受擦除次数的限制,其寿命相当有限,该编码方法可以有效地利用坏块来提高Flash的整体生命周期.分析结果表明:不改变整体结构,只需对编码模块进行简单调整,即可实现多种实际应用需求.     

大学英语词汇记忆的策略

研究大学生记忆英语词汇过程中单词遗忘率高的问题。通过元认知策略和认知策略等相关方法来记忆英语词汇,能够使学生在宏观上有意识地规划调整自己的学习,以保证在有限的时间内保质保量完成大学英语词汇的记忆。     

赛灵思静态随机存储器型FPGA单粒子翻转检测

以XILINX XC2V3000现场可编程门阵列（FPGA）为例,分别通过ICAP和Selectmap接口对配置存储器进行回读检测,并通过局部动态重构的方法实现了故障注入,对单粒翻转（SEU）检测方法进行验证。结果证明回读与重配置是进行FPGA抗SEU设计的有效方法。