模态试验中非线性检测的一种方法及应用

本文利用振动信号实部与虚部之间Ｈｉｌｂｅｒｔ关系的原理,发展了它在模态试验中非线性检测技术。针对工程结构的特性采用了快速算法和修正技术,通过火箭风罩证明了它的实用性     

创新社会治理体制对推动和谐社会建设的新意义

党的十八届三中全会提出“创新社会治理体制”的改革目标,对于在新形势下推动中国特色社会主义和谐社会建设,具有重要的创新意义。从理论发展完善上讲,创新社会治理体制是我国社会建设实现多元化民主治理理念的重大转变;从社会现实需要上讲,创新社会治理体制是抓住时机有效应对当前社会现实矛盾的有力推手;从制度体系建设上讲,创新社会治理体制是与社会主义市场经济体制配套协同的重大举措。     

基于SNA参数的网络舆论系统状态差分分析

近年来,互联网在我国快速发展,网络舆论起着越来越重要的作用,对国家安全和社会稳定产生了重大的冲击和影响。针对网络舆论系统的状态进行研究,借助SNA方法,提出了可作为序参量的一些特征参数。在此基础上,设计了基于时间序列的SNA参数差分算法,实现对网络舆论系统的状态进行观测与分析。同时,对一个真实网络舆论进行实验仿真,验证了这种方法。     

Witchcraft and African development

Impressive investment and growth figures and commercial write-ups enthusing about ‘Africa rising up’, ‘the continent of the future’, and so on, obscure the poverty, illiteracy, poor health and other hardships afflicting the vast majority of African people. Why has massive so-called development and technical ‘aid’ not created the expected dynamic, autonomous economic progress? A blind eye is delicately being turned to the decisive role of people – more specifically, the cultural element. Notwithstanding good intentions, outsiders seeking to promote development assume that black Africans think and act like they only need more education, training and finance in order to ‘catch up’. Outsiders easily forget that since time immemorial, Africans have developed and cherished worldviews and cultures of their own. While these are by no means immutable and do adapt to changing needs and outside influences, Africans refuse to cast off overnight the heritage that makes them the people they are. This paper examines the impact of witchcraft as an integral feature of traditional culture on African existence, notably community life, religion, politics, the law, and economic practice. It stresses the significance of traditional society's powerful egalitarian impulses as well as its profound conviction that all things – goods, wealth, well-being and life force – are in a strictly limited supply that cannot be increased, but can only be redistributed by force or through magical manipulation. While modern life gradually weakens the influence of witchcraft beliefs – in Europe these flourished well into the 18th century – the exasperation associated with Africa's headlong urbanisation actually bolsters these beliefs.     

Unemployed youth: ‘time bombs’ or engines for growth?

While popular narratives about success in South Africa focus on individual effort, accidents of birth continue to determine life prospects. Inequalities in early childhood development, health, and education narrow the range of possibilities that young people have available to them, and this impacts on their risk appetite, including, through the workings of the maturing brain, a propensity to violence, substance abuse, and unsafe sex. New technology offers young people an unprecedented ability to organise and network. This fact, combined with high levels of youth dissatisfaction, unemployment, and marginalisation, leads many to worry that the young are “ticking time bombs”. While there certainly are risks, great unused pools of youth labour also present an opportunity for engaging them in social advancement programmes. Structured youth service is a tried and tested policy option that, when implemented as part of an integrated youth development strategy, can enlist thousands of young people in devoting their considerable energies to leadership for the public good.     

Guns–butter tradeoff in contemporary China

This study offers an investigation of the relationship between defense and social spending in the People's Republic of China. In particular, three consecutive questions are answered here. Does a warfare–welfare tradeoff exist in China's budgetary allocation? Is it positive or negative? What is the causal direction involved? By applying a vector autoregression analysis for the period of 1952–2006, this study finds a unidirectional crowd-out effect going from defense to social spending.     

能源互联网在军事能源转型中的作用

能源互联网是第三次工业革命的重要支柱,是关系到国家经济和产业发展转型的一种战略型技术。文章首先阐述了军事能源转型面临的挑战和要求,探讨了美国在军事能源转型中的主要做法和启示,从理念和技术两方面分析了能源互联网在推动军事能源转型中将发挥的作用。     

美军陆航信息化能力建设之启示

陆航作为地面垂直力量的重要标志,是新时期军事变革的关键领域。美军以体制编制改革、主战平台建设为抓手,从机动作战、发现作战、打击作战、作战指挥、防护作战、保障作战等能力建设入手,迈出向目标部队转换的步伐,走在国际前沿。通过梳理美陆航在战略转型、平台规划、能力建设中的特点,从高速平台、无人平台、有人无人协同技术等方面对我新军事变革下陆航发展提供决策支撑。     

基于时频的逆合成孔径雷达的距离—瞬时多普勒成像方法

为了对机动目标进行ISAR成像,以在时间和频域同时具有高分辨率的时频变化替代傅氏变换作谱分析,得到机动目标距离—瞬时多普勒像。实测数据处理结果表明,与直接用距离—多普勒(R D)算法相比,该方法得到的图像质量有明显提高。     

基于二维雷达组网目标高度定位算法

讨论了通过二维雷达组网的方式可对目标高度进行估计,并对所求出的高度进行了误差分析,通过仿真得到了目标高度和方位角对高度误差的影响。在实际中由雷达站和指挥所的经度、纬度和海拔,可将雷达站测得目标的信息转化到以指挥所为原点的直角坐标系中,为指挥员提供空情,以便进行决策和指挥。