非正交多址系统中基于公平性改善的双层挤压迭代功率分配方法

为了解决下行非正交多址系统中多用户通信的公平性问题,提出了基于公平性改善的双层挤压迭代功率分配方法。研究内容包括:首先,设计基于用户信道增益差的用户信道分裂过程,方便动态调整功率挤压时的挤压程度;其次,从强用户到弱用户进行内层功率挤压迭代,根据信道分裂情况设置挤压因子与附加挤压因子,使信道分裂处的弱用户对强用户挤压程度更强;第三,对内层挤压功率进行外层迭代的再分配与再挤压,可保持总功率不变的情况下,进一步提升功率分配的公平性。仿真结果表明:对比信道分裂下与信道未分裂下的公平性指数,其性能提升了25%;对比仅进行挤压因子与附加挤压因子调整,而未进行内外层迭代次数调整的情况,公平性指数性能提升了53.71%,同时,所提算法比注水算法达到的公平性指数明显改善,在公平性提升方面达到了较好的效果。

连续挤压塑变区速度场分析及功率计算

在分析轮腔间隙区和轮槽区金属流动规律以及溢余几何形态的基础上，建立质点流动速度场。由该速度场导出溢余量与单位挤压力、轮腔间隙和轮速等工艺参数之间的关系式；在对变形区进行受力分析的基础上，给出挤压型腔几何参数、单位挤压力、轮腔间隙以及轮槽尺寸之间的关系式，推导出挤压轮上的驱动功率和摩擦功率的计算公式。连续挤压实验和力学性能测试证明数学模型正确，可以作为工程实践的指导。

开式冷挤压成形功率及挤压力的研究

给出了开式冷挤压动可容连续速度场及上限挤压力计算公式，讨论了主要参数对挤压力的影响，理论分析结果得到了实验验证。

基于流体动力学的斜齿轮副搅油功率损失分析

在高速工况下,搅油损失在总功率损失中占很大比重,研究齿轮搅油功率损失对于提高传动效率具有重要意义。提出一种基于流体动力学的能够计算斜齿轮副搅油功率损失的计算模型,该模型采用将斜齿轮沿接触线划分为若干个薄直齿轮的方法计算斜齿轮副的搅油损失;将齿轮副搅油功率损失分为周面搅油功率损失、端面搅油功率损失以及啮合区挤压功率损失三部分,分析浸油深度、转速、螺旋角、齿宽、模数对搅油损失的影响以及各部分搅油损失占总搅油损失的比重。结果表明:搅油损失随着浸油深度、转速、螺旋角、齿宽、模数的增大而增大,其中转速、齿宽和模数对搅油损失的影响较大,浸油深度和螺旋角对搅油损失的影响较小;啮合区挤压功率损失在整个搅油功率损失中占最大比重。

CONFORM挤压带翼内凸筋D型管的力学分析

运用工程法对连续挤压带翼内凸筋D型管变形过程中各区域的挤压力组成部分进行了计算，建立了计算连续挤压过程功率的数学模型．经工业生产试验验证，功率计算值与实侧值误差范围在15％以内，满足工程计算的要求．

Optimization of three-dimensional boiling enhancement structure at evaporation surface for high power light emitting diode

A theoretical model of phase change heat sink was established in terms of thermal resistance network. The influence of different parameters on the thermal resistance was analyzed and the crucial impact factors were determined. Subsequently, the forming methods including ploughing-extrusion and stamping method of boiling enhancement structure at evaporation surface were investigated, upon which three-dimensional microgroove structure was fabricated to improve the efficiency of evaporation. Moreover, the crucial parameters related to the fabrication of miniaturized phase change heat sink were optimized. The heat transfer performance of the heat sink was tested. Results show that the developed phase change heat sink has excellent heat transfer performance and is suitable for high power LED applications.

Amplitude-Nth-power squeezing of PB phase coherent states

PB Phase Coherent States are very important quantum states in quantum optics. In order to investigate the amplitude-Nth-power squeezing of PB Phase Coherent States, we introduce the algebraic properties of the PB phase operator and the PB Phase Coherent States which are constructed by PB phase theory. We applied amplitude-Nth-power squeezing theory to define the Amplitude-Nth-Power Squeezing of PB Phase Coherent States and investigate the characteristic of the amplitude-Nth-power squeezing of PB Phase Coherent States. We obtained surprising results, in that the results were different from the other quantum states. As for |Z〉(PB Phase Coherent State), the results show that when Z is a real number there only exists amplitude-Nth-power squeezing of component; when Z is a complex number, there exists amplitude-Nth-power squeezing of component and component; when Z is a pure imaginary number, if N is odd, then there does not exist amplitude-Nth-power squeezing of component, but there exists amplitude-Nth-power squeezing of component and if N is even, then there exists amplitude-Nth-power squeezing of component, but there does not exist amplitude-Nth-power squeezing of component.