基于光电阵列的水下定位通信一体化系统设计

针对无人潜航器(UUV)在水下容易受复杂环境的干扰而造成相对光源姿态偏转,使定位与通信受影响的问题,提出了一种基于曲面阵列的水下定位通信方案,依此方案设计了一套基于现场可编程门阵列(FPGA)为处理核心的水下定位通信系统,并对系统进行了测试。测试结果表明:此系统能够精确估计出接收端相对光源的姿态并做出调整,在调整姿态后其通信性能具有明显提升。     

SMS方式远程监控软件的设计与实现

随着Internet和无线接入技术的迅猛发展，计算机与网络技术被越来越多的应用于生产和管理领域，因此，各种监控管理系统也就应运而生了。重点介绍了通过GSM网以短消息的方式传输数据，对远端设备进行监控的软件监控平台的构成及其功能，并简单阐述了设计思想、方法和技术要点。     

学贵有疑--质疑、反思

文[1]“巧解”摘录:题已知二次函数f(x)=ax2 bx c(a,b,c∈R)的图像经过点(-1,0),且x≤f(x)≤12(x2 1)对一切实数x都成立,求f(x).原解设A(x),B(f(x)),C(x2 12)为数轴上的3点,则ABBC=λ.由于当x∈R时,总有x≤f(x)≤12(x2 1)恒成立,∴λ≥0.由定比分点公式得f(x)=x λ(x2 12)1 λ.     

掺钬氟化钇锂——一种在2.06微米工作的激光材料

多敏化掺钬氟化钇锂是目前唯一可在室温条件下产生2·06微米激光的低阈值、高效率的激光晶体。近年来,美国陆军电子指挥部等单位对这种晶体非常重视,对材料本身、与之配用的泵浦,使用这种材料的器件都做了大量工作,并已用于手提式激光测距机。该晶体的基质为氟化钇锂(LiYF4),激活离子为钬(Ho3+),敏化离子为铒(Er3+)、铥(Tm3+)、镱(Yb3+)等。多敏化掺钬氟化钇锂常简写为αβYLF或LiRF4。其组成为LiY(l-x-y-z)Erx Tmy HozF4,代表成份为LiY0.416Er0.5 Tm0.067 Ho0.017 F4。     

BDN调Q片失效原因及其调Q的分子结构机制

本文概述了查找BDN调Q染料片受溶剂或片子基质中所含杂质氧化褪色失效原因的实验研究,并根据BDN的分子轨道及光谱数据,初步提出了对BDN调Q机制的看法.     

基于光滑粒子流体动力学的滑油泵数值仿真

基于光滑粒子流体动力学方法,构建齿轮泵壳体及内部流体的粒子模型,对内啮合齿轮泵在不同工况下的流量特性进行数值模拟。首先设置了均匀分布的油泵出入口压强,计算得到的流量结果与试验结果吻合,且在中低转速下流量与转速呈线性关系;针对高转速下油泵流量降低的问题,通过适当减小周期模型内部的流体粒子数反映流量降低,获得了与试验值相吻合的连续转速流量的模拟结果;针对影响齿轮泵性能的间隙和空化现象,结合模型特点给出了相应的近似处理方法。通过以上研究,将SPH方法成功地应用于滑油泵问题的分析计算。     

富钙镁离子溶液以碳酸盐沉淀固定CO2的试验研究

提出了利用富钙镁离子溶液（海水淡化产生的浓海水、地下卤水、高硬度工业废水等）以碳酸盐沉淀形式实现CO₂固定的思路,以2倍浓度的海水为例进行分析,表明富钙镁离子溶液具有可观的固碳潜力。考察了氨水-氯化铵溶液、氨水-碳酸氢铵溶液和有机胺（MEA、MDEA）作为添加剂提高溶液pH值的方式对碳酸盐沉淀形成能力的影响。结果表明这三种添加剂均可在一定程度上提高溶液pH值,促进富钙镁离子溶液中难溶碳酸盐沉淀形成。     

Investigation of neutron induced reactions on ^23Na by using Talys1.4

The neutron induced reactions on ^23Na are investigated by using the Talys1.4 program. The calculated results for the ^23Na（n, 2n）22Na reaction are found to agree with the experimental results. The cross sections of the residues of the（n, n）,（n, γ）,（n, p）, and（n, np） channels in the reactions are presented, and at the same time, the neutron induced reactions on22 Ne are also investigated.     

Pairing-energy coefficients of neutron-rich fragments in spallation reactions

The ratio of pairing-energy coefficient to temperature(a_p/T)of neutron-rich fragments produced in spallation reactions has been investigated by adopting an isobaric yield ratio method deduced in the framework of a modified Fisher model.A series of spallation reactions,0.5A and 1A Ge V~(208)Pb+p,1A Ge V~(238)U+p,0.5A Ge V~(136)Xe+d,0.2A,0.5A and 1A Ge V~(136)Xe+p,and~(56)Fe+p with incident energy ranging from 0.3A to 1.5A Ge V,has been analysed.An obvious odd-even staggering is shown in the fragments with small neutron excess(I≡N-Z),and in the relatively small-A fragments which have large I.The values of a_p/T for the fragments,with I from 0 to36,have been found to be in a range from-4 to 4,and most values of a_p/T fall in the range from-1 to 1.It is suggested that a small pairing-energy coefficient should be considered in predicting the cross sections of fragments in spallation reactions.It is also concluded that the method proposed in this article is not good for fragments with A/A_s85%(where A_(s )is the mass number of the spallation system).     

Isoscaling Behaviour in the Isospin-Dependent Quantum Molecular Dynamics Model

The isoscaling behaviour is investigated in a frame of isospin-dependent quantum molecular dynamics models. The isotopic yields ratio Y2/Y1 for reactions ^48Ca ^48Ca and ^40 Ca ^4oCa at different entrance channels are simulated and presented, the relationship between the isoscaling parameter and the entrance channel is analysed, the results show that a and β reduce with the rise of incident energies and increase with the impact parameter b, which can be attributed to the temperature varying of the pre-fragments in different entrance channels. The relation of a and symmetry-term coefficient Csym reveals that the chemical potential difference △μ is sensitive to thesymmetry-term coefficient Csym, and raises with the increasing Csym.