介子跃迁形状因子的重夸克极限和1/m_Q修正

在BS理论框架下,对0~-→0~-和0~-→1~-(0~-和1~-分别代表赝标介子和矢量介子)跃迁的形状因子进行模型无关的分析.结果表明BS框架既能给出重夸克极限下的自旋—味对称性,又能给出重夸克有效理论关于1/m_Q修正的Luke定理及其它关系.     

基于燃油压力波的柴油机高压喷射系故障信息的研究

本文从柴油机燃油压力波的特征出发,建立ARI(Auto—Regressive Integra—ted)时序参数模型.通过对不同故障下的燃油压力波基于ARI时序参数的现代谱分析,说明ARI时序参数模型较好地揭示了燃油压力波蕴含的故障信息.通过燃油压力波的ARI时序参数构造故障诊断模式向量,根据几何距离与信息距离的测度来诊断故障,具有一定的实践意义.     

关于潜艇装备劳兰C导航仪技术问题的研究

本文提出了一种改善潜艇现有天线接收性能的方法,从而解决了在潜艇上安装使用劳兰C导航仪的关键技术问题。     

爆轰波在可压缩金属板面上斜反射初始参数的计算

本文计算了爆轰波在可压缩金属板面上斜反射时的初始参数。计算中选用的五种炸药是TNT(p_0为1.64g/cm~3,1.45g/cm~3)、RDX(p_0为1.59g/cm~3,1.76g/cm~3,1.80g/cm~3)、RDX/TNT(77/23)(p_0为1.75g/cm~3)、Pentolite(p_0为1.65g/cm~3,1.68g/cm~3)和B 炸药(p_0为1.71g/cm~3);三种介质是铁、铜和铝。     

某新型主战坦克超越射击时至友军的安全距离

在分析影响坦克超越射击时至友军安全距离主要因素的基础上,结合某新型主战坦克炮口冲击波超压试验数据,通过运用M athem atica软件对数据进行统计处理和理论分析计算,提出了某新型主战坦克超越射击时至友军的安全距离,为我军新型主战坦克安全地实施超越射击提供了可靠的理论依据。     

漂浮式微型波力发电装置传动系统的速度分析与调节

针对边防驻岛官兵用电难的问题,结合海洋波浪能特点,提出了一种新型漂浮式微型波力发电装置。基于装置结构模型,分析了其结构特征和工作原理;建立了传动系统的运动学模型,分析了其运动特性和速度调节性能;进行算例分析,验证了理论模型的正确性。研究表明：双侧传动轮系输入系统优于单侧传动轮系输入系统;改变飞轮的转动惯量,可以调节速度的波动。分析结果为该装置的后续试验研究提供了理论依据。     

Study of simple plane wave generator with an air-metal barrier

Plane wave generators (PWGs) are used to accelerate flyer plates to high velocities with their generated plane waves, which are widely used in the test of dynamic properties of materials. The traditional PWG is composed of two explosives with different detonation velocities. It is difficult to implement the related fabrication processes and control the generated waves due to its complicated structures. A simple plane wave generator is presented in this paper, which is composed of two identical cylindrical high explosive (HE) charges and an air-metal barrier. A theoretical model was established based on two different paths of the propagation of detonation waves, based on which the size of air-metal barrier was calculated for a given charge. The corresponding numerical simulations were also carried out by AUTODYN-2D^® based on the calculated results, which were used to compare with the theoretical calculations. A detonation wave with a flatness of 0.039 μs within the range of 70-percent diameter of the main charge was obtained through the simulations.     

高超声速飞行器中若干气动难题的实验研究

回顾了近几年本研究团队在高超声速飞行器若干气动难题方面的实验研究进展。在边界层转捩方面,测量了边界层转捩现象,研究了攻角效应对圆锥边界层转捩的影响,获得了边界层转捩的脉动特性以其对飞行器表面热流和摩阻的影响。在激波-边界层干扰方面,分析了突起物形状变化对流动特性的影响,研究了复杂外形的流动特性。     

Alternative models of Greek defence expenditures

This paper models and estimates Greek defence spending over the 1950–1989 period. It employs the Stone‐Geary welfare function and estimates levels of defence expenditures by the Engle‐Granger two‐step procedure. The Dickey‐Fuller test regression for cointegration is specified in terms of the significance of additional augmentations. The Deaton‐Muellbauer functional form is then employed and an estimating equation for the expenditure share of defence is derived. This specification is compared with the levels equation through a number of non‐nested tests involving model transformation.     

双浮体波浪能转换装置中重心布置对波浪能吸收影响分析

提出一种基于横摇运动的双浮体波浪能转换装置,利用水面浮体与水下浮体之间的相对横摇运动实现对波浪能的吸收。在保持水下浮体稳定的前提下,水面浮体的横摇运动决定了整个装置对波浪能吸收情况。水面浮体的横摇运动受其横摇固有频率的影响,主要是重心布置。为了合理选择水面浮体的重心位置,采用数值分析的方法对箱型浮体在长峰不规则波下的工作情况进行分析,讨论重心布置对波浪能吸收的影响以及对PTO参数选择的影响。结果表明,重心的布置可改变波浪能吸收的频段,重心布置越低,可吸收的波浪能频段越广,越有利于波浪能的吸收。