Implementation of tactical maneuvers with maneuver libraries

This study creates and combines the general maneuver libraries for fixed-wing aircraft to implement tactical maneuvers. First, the generalized maneuver libraries are established by analyzing the characteristics of tactical maneuvers required in battlefields. The 7th order polynomial is applied to both the creation of the maneuver libraries and the generation of the trajectories or flight paths for modal inputs. To track the desired trajectory, we design the Attitude Command Attitude Hold (ACAH) system and the Rate Command Rate Hold (RCRH) system using Model Following Controller (MFC). Moreover, the Line-of-Sight (LOS) guidance law is designed. In particular, the CONDUIT® is employed to optimize the gains so that the control systems meet the aircraft Handling Qualities (HQ) criteria. Finally, flight simulations are performed for the longitudinal loop, immelmann-turn, and climb-slalom-descent maneuvers to verify that tactical aggressive maneuvers are realizable via the combination of maneuver libraries. This study can contribute to the development of flight techniques for aircraft tactical maneuvers and to the revision of air force operational manuals.     

Calculation of the transonic dip of airfoils using viscous-inviscid aerodynamic interaction method

A numerical procedure for the calculation of the transonic dip of airfoils in the time domain is presented. A viscous-inviscid aerodynamic interaction method is taken to calculate the unsteady aerodynamic loads. In the present case the integral boundary layer equations are coupled with the Transonic Small Disturbance (TSD) Potential Equation. The coupling between structural motion and aerodynamic loads is carried out using State Space equation. It is solved by State Transition Matrix technique. Results are presented for NACA 64A010 and NLR 7301 airfoils with structural data from Isogai and DLR, respectively. Comparisons show good agreement with other numerical results. Certain deviations of experimental data taken from literature need more insight in the detailed test conditions.     

S7-300液位控制系统下位机的实现

利用以太网,结合西门子现场总线搭建了过程控制平台,完成了对温度、压力、流量和液位这些典型过程参数的采集、存储和分析,并利用PID算法通过对变频器、电控阀门的控制,实现恒压供水任务,进而完成对于水箱液位稳定的控制.     

The double-pulsar binary J0737–3039

A recent multibeam pulsar survey of the outer Galactic plane at Parkes has discovered the first-known double-pulsar binary, a very compact double neutron star system in which both stars are observable as radio pulsars. In this review, we briefly describe the discovery and the studies which have been enabled by the unique properties of the system. These range from the most precise confirmation yet of the theory of general relativity, with the possibility of even more new tests and the measurement of second-order post-Newtonian effects, to studies of the magnetospheres and emission properties of the two pulsars. The discovery also results in a significant increase in the expected rate of occurrence of the mergers of double neutron star systems, and hence the rate of detection of such events by the new ground-based gravitational wave detectors.     

Relationship between daily variation of cosmogenic nuclide Be-7 concentration in atmosphere and solar activities

Daily Be-7 concentrations in air at the height of 15 m are continuously observed at 38°15.2′N, 140°20.9′E, between 2000 and 2001. The average concentration and the relative standard deviation were 4.0 mBq/m³ and 50% in 2000–2001, respectively. The Be-7 concentrations increased 2.5% with the decrease in the sunspot numbers by 6.7% for the term of two years. From the power spectral analysis, the periodicity of 26 days is shown for the daily Be-7 concentrations. The folding analysis indicates that the time variation of the Be-7 concentration is similar to that of the ground-based neutron counting rate, and the phase delay for the minimum portion of Be-7 concentration was roughly 8 days to the maximum sunspot number. These results indicate that the Be-7 concentrations in the air at ground level have 26 day periodicity as a component of time variations and the time variation is caused by the solar modulation of galactic cosmic rays, which corresponds to the variation of the sunspot number due to the rotation of the sun.     

对B2C领域两种营销渠道形式的比较探析

在B2C领域,传统营销渠道与网络营销渠道是一对相互竞争的矛盾。网络营销渠道是新生事物,凭借低成本优势得以迅速成长。传统营销渠道根基雄厚,且更贴近消费者的需求,因此仍吸引着大多数的消费者。网络营销渠道如何进一步发展,传统营销渠道如何吸收新的元素,不对两种营销渠道进行比较,是不能获得满意的答案的,而比较这两者之间的相对劣势比比较它们的优势更能引发思考。     

基于Web Service的B2B电子商务系统模型的研究

B2B电子商务是目前最具潜力的商务形式。但传统B2B电子商务系统的基本结构和交互接口均没有统一的标准和解决方案，带来了系统可重构性和可移植性差等缺陷。针对这种缺陷，结合Web Service技术，提出基于Web Service的B2B电子商务系统模型。该系统模型通过构建核心应用程序整合Internet和Internet范围内相对独立的Web Service，并作为供应链的一部分，能提供标准接口实现和其他应用程序如ERP，CRM和SCM等的交互，这种形式的B2B电子商务系统能很容易地进行开发和维护。最后以其中一个模块为例，给出了具体实现基于WebService的B2B电子商务系统的解决方案．     

基于Web方式下的信息管理系统的开发

本文介绍了一个基于Web方式下信息信息管理系统的开发实例，重点阐述了Web方式下信息管理系统的设计思想以及及关键技术的实现     

为中国开发太空探路 创中国首飞太空记录——纪念T-7系列探空火箭首次发射成功45周年

在中国第一个实用探空火箭系列——T-7系列探空火箭首次发射成功45周年之际，回顾了该系列火箭的研制由来和基本情况，论述了该系列火箭对中国开发中层大气和太空所起到的探路作用。     

1553B与CAN总线的互连

介绍了 1553 B与 CAN总线的互连方法 ,并分析了互连的实时性与可靠性 ,指出 CAN总线相对于 1553 B的优缺点。