面向B5G/6G的三三三网络体系架构和优化学习机制

面对未来B5G/6G网络是大连接复杂智能网络,极其大量的用户连接、需求连接、服务连接,加之3G、4G、5G甚至6G的综合运用,将导致网络变得极其复杂的挑战,提出了一种三三三网络体系架构,它是一个包含3类网络(核心网、接入网、终端网)、3种资源(频率带宽、功耗、时延)和3项需求(生活、工作、服务)的三维立体综合优化的体系...     

大数据分析在移动通信网络优化中的应用研究

随着我国互联网技术的不断发展,大数据时代已经到来,在大数据技术的作用下,移动通信网络得到了很大程度的优化.目前我国的移动通信网络具体分为2G、3G和4G网络,大数据技术使移动通信网络更加高效,但在应用中也同样面临着问题.本文将具体探讨大数据分析在移动通信网络优化中的问题和应用方法,希望给相关人士提供一些参考.     

Determining the resistance of X-pinch plasma

The current and the voltage of an X-pinch were measured. The inductance of the X-pinch was assumed to be a constant and estimated by the calculation of the magnetic field based on the well-known Biot-Savart's Law. The voltage of the inductance was calculated with L · di/dt and subtracted from the measured voltage of the X-pinch. Then, the resistance of the X-pinch was determined and the following results were obtained. At the start of the current flow the resistance of the exploding wires is several tens of Ohms, one order of magnitude, higher than the metallic resistance of the wires at room temperature, and then it falls quickly to about 1 , which reflects the physical processes occurring in the electrically exploding wires, i.e., a current transition from the highly resistive wire core to the highly conductive plasma. It was shown that the inductive contribution to the voltage of the X-pinch is less than the resistive contribution. For the wires we used, the wires' material and diameter have no strong influence on the resistance of the X-pinch, which may be explained by the fact that the current flows through the plasma rather than through the metallic wire itself. As a result, the current is almost equally divided between two parallel X-pinches even though the diameter and material of the wires used for these two X-pinches are significantly different.     

加权Herz型Hardy空间上的Littlewood-Paley g*λ函数

讨论了在q=2的情形下,Littlewood-Paley gλ*函数在加权Herz型Hardy空间中的有界性,即当0相似文献   

微波辅助萃取-HG-AFS测定土壤中无机砷

采用微波辅助萃取分析物,联合原子荧光光谱技术,建立了微波辅助萃取-HG-AFS测定土壤中无机砷的分析方法。用正交试验设计结合单因素试验优化了样品粒度、萃取温度、萃取时间、固液比等微波萃取条件,研究了共存离子对无机砷测定的干扰情况。方法的线性范围为1.0~160.0μg/L,无机砷的检出限为0.20μg/L,相对标准偏差为0.3%,样品回收率为93.0%~98.5%。用本法分析3个不同产地有代表性土壤中无机砷量。     

远红外自由电子激光光腔改进的模拟分析

 提出在中物院远红外自由电子激光光腔中全程采用波导对光场进行约束,利用计算光束与电子束横向叠合因子分析了光腔中是否加入波导管对腔内净增益的影响。模拟了减小波导管间隙和提高扭摆器峰值磁场场强对腔内增益的影响。3维数值模拟计算表明在光腔中加入波导使扭摆器净增益由-6%提高到约25%;波导管的间隙每缩小2 mm,腔内净增益提高7％~15％;场强每提高0.02 T,腔内净增益可增加5%~10%。     

Scaling of rise time of drive current on development of magneto-Rayleigh–Taylor instabilities for single-shell Z-pinches

In fast Z-pinches,rise time of drive current plays an important role in development of magneto-Rayleigh–Taylor(MRT)instabilities.It is essential for applications of Z-pinch dynamic hohlraum(ZPDH),which could be used for driving inertial confinement fusion(ICF),to understand the scaling of rise time on MRTs.Therefore,a theoretical model for nonlinear development of MRTs is developed according to the numerical analysis.It is found from the model that the implosion distance L=r₀-r_mcdetermines the development of MRTs,where r₀is the initial radius and rmc is the position of the accelerating shell.The current rise timeτwould affect the MRT development because of its strong coupling with the r;.The amplitude of MRTs would increase with the rise time linearly if an implosion velocity is specified.The effects of the rise time on MRT,in addition,are studied by numerical simulation.The results are consistent with those of the theoretical model very well.Finally,the scaling of the rise time on amplitude of MRTs is obtained for a specified implosion velocity by the theoretical model and numerical simulations.     

喇曼自由电子激光器实验的数值模拟

本文采用基于单粒子理论的CAGFEL程序,对中国科学院上海光学精密机械研究所(简称上海光机所)喇曼自由电子激光器的近期实验结果进行了数值模拟,计算表明,当电子能量E_e=0.5MeV,能散度△γ/γ=6％和发射度ξ=0.06(π)rad·cm时,器件的峰值功率高达24MW,对应的辐射增长率为120dB/m,效率为6.1％。     

弱型及加权弱拟(1,1)型算子的有界性

在这篇文章中 ,我们介绍了拟 (1 ,1 )型算子T ,给出了它的弱有界性和加权弱有界性     

关于广义Sublaplacian算子特征函数的展开

本文研究了广义Ｓｕｂｌａｐｌａｃｉａｎ算子特征函数的展开．通过定义广义　－扭曲卷积，我们得到相应的Ｐｌａｎｃｈｅｒｅｌ定理及Ｈａｕｓｄｏｒｆｆ－Ｙｏｕｎｇ不等式，最后，我们还给出了当广义Ｓｕｂｌａｐｌａｃｉａｎ算子的特征值为离散时的一些结果．