燃气的基准表及图制定

本文在阐述基准的热力学概念基础上,提出了燃气基准的计算方法,应用CHAPPELL推荐的有关燃气热力性质表达式,导出计算燃气基准的公式,通过微机计算,将结果整理成燃气基准的有关表、图。     

污水处理装置在冶金行业中的应用

对污水处理装置的技术参数、技术要求及设计方案的选择、工作原理做了进一步的阐述。对工业循环冷却水的处理有实际指导意义。     

新建他激反激变换器方程及其解析解

引用文 [1 ]的思路 ,寻找他激反激变换器的运行状态特征参量 (磁通密度增量、剩余磁通密度和占空比 )与构成这一变换器的基本物理参量之间的函数关系。首先阐明由于频率给定 ,他激反激变换器稳态运行时会出现无剩磁工况和有剩磁工况两种。而后确定这两种工况下 ,磁路等效储能空间单位体积每个周期的传输能量 (命名为“磁能传输密度”)。在这基础上 ,分别建立和解出他激反激变换器在不同工况下稳定运行时应满足的方程。最后根据所得的解析解阐明这种变换器的特性。本文和文 [1 ],以磁路分析为基础建立了一种新的反激变换器理论。     

Investigation of the differential rotation of the large-scale magnetic elements for the solar activity cycles 20 and 21

The differential rotation of the patterns of the large-scale solar magnetic field during solar activity cycles 20 and 21 is investigated. Compact magnetic elements with the polarity of the general solar magnetic field have larger speed of rotation than the elements with the opposite polarity. The surface of the Sun was divided by 10°-zones. In all of them the average rotation rate of the magnetic elements with negative polarity is little higher than that of the magnetic elements with positive polarity, except for 50°-zone of the south hemisphere and at the 10° latitude of the north hemisphere.

The rates of differential rotation for large-scale magnetic elements with negative and positive polarities have similar behavior for both cycles of the solar activity.

The rotation rate varies at polarity reversal of the circumpolar magnetic fields. For the cycle No 20 in 1969–1970 the threefold reversal took place in the northern hemisphere and variations of rotation rate can be noticed for magnetic elements both with positive and negative polarity for each 10°-zone in the same hemisphere.     

Reconstructed 3-d magnetic field structure and hard X-ray two ribbons for 2000 Bastille-day event

The Bastille-day event in 2000 produced energetic 3B/X5.6 flare with a halo CME, which had great geo-effects consequently. This event has been studied extensively and it is considered that it follows the two-ribbon flare model. The flare/CME event was triggered by an erupting filament and TRACE observations showed formation of giant arcade structures during the flare process. Hard X-ray (HXR) two ribbons revealed for the first time in this flare event (Masuda et al., 2001). The reconstruction of 3-D coronal magnetic fields revealed a magnetic flux rope structure, for the first time, from extrapolation of observed photospheric vector magnetogram data and the flux rope structure was co-spatial with portion of the filament and a UV bright lane (Yan et al., 2001a, 2001b). Here we review some recent work related to the flux rope structure and the HXR two ribbons by comparing their locations and the flux temporal profiles during the flare process so as to understand the energy release and particle accelerations. It is proposed that the rope instability may have triggered the flare event, and reconnection may occur during this process. The drifting pulsation structure in the decimetric frequency range is considered to manifest the rope ejection, or the initial phase of the coronal mass ejection. The HXR two ribbons were distributed along the flux rope and the rope foot points coincide with HXR sources. The energy dissipation from IPS observations occurred within about 100 R _⋅ is consistent with the estimate for the flux rope system. This revised version was published online in August 2006 with corrections to the Cover Date.     

一个简单有效的磁记录纠错系统

介绍一种简单有效的纠错编码方法 ,用于资源卫星高密度数字磁记录器 ,使误码率由 10 -6降低到 10 -11,同时介绍它的基本工作原理、实现方案及试验结果。     

Numerical Simulation of Impact Loading on Solid Propellant Within an Orthotropic Shell

The strain–stress state of the solid propellant rocket engines (SPREs) is simulated under impact. The effect of orientation of elastic and strength properties of orthotropic organoplastic shell material on the strain–stress state of the solid propellant is investigated. Normal and oblique impact of single steel cylinder projectiles, both simultaneous and at different times of multiple, converging steel spheric particles with SPRE are investigated in this study. The investigation is conducted numerically. The numerical modeling was carried out in a three-dimensional formulation by the method of finite elements for the continuous approach of the mechanics of a deformable solid. The destruction of the anisotropic material is described by the tensor-polynomial criterion of the fourth degree, which takes into account the influence of hydrostatic pressure.     

中国地区MAGSAT卫星标量和矢量磁异常图

使用MAGSAT卫星资料,编绘中国及邻近地区的卫星磁异常图(10°N—60°N,70°E—140°E)。为了提取地壳异常场,必须从观测资料中消除主磁场、磁层场,感应场和电离层场。本文选用GSFC(12/83)地磁场模型,消除主磁场,磁层场和感应场。为了进一步消除电离层场的影响,改善相邻轨道磁异常的一致性,用纬度的二次多项式拟合每一条轨道的初始地壳异常,并从初始地壳磁异常值减去这一拟合值,从而获得最后的地壳异常值(△X,△Y,△Z,△F)。把研究地区分成1°×1°的网格,将每个网格内的磁异常进行平均,以获得网格中心点的异常值。根据这些网点值绘制中国及邻近地区的卫星标量和矢量磁异常图。等值线间隔为2nT。为了检验卫星磁异常图的可靠性,将卫星资料分成黎明组、黄昏组和联合组,分别进行处理和绘制卫星磁异常图。结果表明:根据上述资料绘制的卫星磁异常图有很好的一致性。中国地区的卫星磁异常值位于—10nT—10nT。卫星磁异常与区域构造特征有较好的一致性;塔里木地台、扬子地台和中朝地台是正磁异常区,西藏高原是负磁异常区。卫星磁异常反映出下地壳磁化强度的横向不均匀性。     

强场脉冲充磁退磁装置

介绍了充电电容器通过磁路瞬时放电产生强磁场的原理 ,选择回路参数可实现高矫顽力类永磁材料的充磁或者退磁 ,介绍了所研制的脉冲充磁退磁装置的性能。     

管内气体流动的多参数动态数学模型的建立

由于从飞机发动机中引出气流的不稳定流动，对飞机空调系统的精确调节有很大影响。根据气体流动的基本定理，一种适用于小管径、多变量输入输出的可压缩气体管内流动的动态数学模型已在本文推导出，并采用频域和时域方法对数学模型进行了分析。研究结果表明：当气体的入哭喊和波频率上升到一定值时，出口压力将急剧上升。流量的变化对出口压力影响最大。入口温度的变化对出口压力和流量有影响，但入口压力和流量的扰动对出口温度没有