阴极发射电流对磁控管性能的影响

利用三维粒子模拟软件,比较研究了在磁控管模拟计算中三种阴极发射方式在电流控制、宏粒子数和计算度上的不同,确定了Beam发射是电流控制的最好发射模式;在固定电子能量的基础上,研究阴极电流发射密度分别为9A/cm 3A/cm~2和7A/cm~2下的输出频谱和模式竞争过程,研究结果表明:选择合适的发射电流大小有利于磁控管频谱噪声抑制．     

城市汽车噪声危害与控制的现实思考

噪声与三废(废水、废气、废渣)一样,已成为当今社会的一大公害。因而怎样尽量减少噪声的干扰和对人体的危害是一个值得探讨的课题。     

統計量化特性的綫性化及其在数字滤波器中的应用

本文提出了一种舍入量化器统计量化特性线性化的概念。根据这一概念找到了一种抑制数字滤波器极限环的方法。该方法能抑制一阶、二阶数字滤波器中所有极限环,并且滤波器输出不存在剩余噪声。本文还提出了一种求极限环平均抑制时间的计算方法,计算结果与实验数据相符。     

基于自适应网络模糊推理系统的噪声抵消

对自适应网络模糊推理系统(ANFIS)在噪声抵消中的应用进行了研究，说明了ANFIS的结构和使用ANFIS进行噪声抵消的原理，对窄带干扰的滤除和噪声中的信号提取两种情况进行了仿真，并对ANFIS和LMS(小均方误差准则)两种算法进行了对比研究，结果表明，利用ANFIS进行噪声抵消要优于LMS。     

半主动动力吸振镗杆系统的颤振抑制机理

深孔镗削过程中,针对影响工件加工精度和表面质量的颤振现象,建立单自由度切削颤振系统的动力学模型,利用谐波平衡法求得机床主轴转速与极限切削宽度的关系式,并绘制了机床主轴转速与极限切削宽度的稳定性图,结合半主动动力吸振镗杆刚度和阻尼系数的可控性,分析了机床结构刚度及阻尼系数大小对颤振抑制的影响。研究结果表明:机床颤振频率随着主轴转速呈分段线性变化,增大机床结构的刚度和阻尼,系统的稳定性区域在一定范围内相应的增大。为今后进行半主动动力吸振镗杆具体模型的建立和相关参数的选取提供了理论依据,具有实际意义。     

The Status of Freud's Legacy on Emotional Processing: Contemporary Revisions

ABSTRACT

This article evaluates, in light of current empirical data, several of the assumptions contributed to our field by Freud about how emotions operate. The idea that expression of emotions dissipates these emotions is evaluated. The idea that bottling up emotion results is ill health is reviewed. The idea that pain of trauma and loss needs to be confronted is examined. Additionally, the assumption that traumatic events invariably result in distress is discussed. It is argued that empirical findings reject the Freudian model of emotion as energy that must be discharged. Empirical findings also support the view that revisiting painful emotion can be helpful when the result is to find a new perspective on painful events. Thus, empirical literature rejects Freudian rationale for confronting prior trauma and loss, while offering new perspectives for how to handle distress resulting from trauma and loss.     

Curvelet 域蒙特卡罗估计的随机噪声衰减

针对低信噪比地震资料进行噪声压制时, 传统滤波方法容易损伤有效波。研究认为, curvelet 多尺度多方向的分析能力可以有效分离随机噪声, 提出基于蒙特卡罗估计的自适应非线性阈值函数法衰减噪声能量, 实现在压制噪声的同时保持有效反射信息。模型算例及大巴山地区某地震资料的处理实例表明, 该方法能够有效地压制随机干扰, 同相轴连续性与剖面信噪比较传统小波方法显著提高, 一定程度上改善了常规滤波处理方法在压制噪声的同时对有效波的影响。     

Instilling the Soul of Group Work in Social Work Education

This article addresses the process of developing an educational model for teaching social work with groups in an undergraduate social work degree program in Israel. The model was developed against a backdrop of decreasing status of social group work within the profession and the consequent loss of its unique identity and power in the social work field. The model's aims are to provide the students with the basic principles of social group work, to ensure its place in their professional identity, and to awaken curiosity regarding its use in their future practice as social workers.     

基于耦合Duffing振子和Van der pol振子系统的微弱信号检测研究

传统的微弱信号检测在检测信噪比较低的信号时效果不理想,基于此提出了一种基于Duffing振子和Van der pol振子的耦合非线性系统,建立了非线性耦合模型,详述了耦合系数对耦合非线性系统的影响。采用Simulink数值仿真的方法,分析了Duffing振子和Van der pol振子耦合非线性系统的动力学行为,阐述了基于相平面变化进行微弱信号检测的工作原理。并且具体分析了耦合系统在色噪声背景下的微弱信号检测效果,取得了很好的效果。