基于能源互联网背景的储能二次电池技术发展分析

能源互联网是在现有配电网基础上,融合新能源技术和互联网技术,将分布式能源采集装置和分布式能源储存装置联合发展起来的新技术,对于优化能源结构和提高能源利用具有重要的意义。文章以能源互联网对储能电池的需求为背景,首先归纳了能源互联网对于储能电池的要求,在此基础上重点分析了多种可应用于能源互联网的储能电池的性能与特点,并对其未来发展趋势进行了展望。     

新型PBL键外包钢-混凝土组合梁抗弯承载力简化计算

基于理论分析,建立了新型PBL键外包钢-混凝土组合梁抗弯承载力计算的基本假定和计算模型,推导出组合梁抗弯承载力的简化计算公式,并采用有限元分析软件ANSYS14.5对组合梁进行了非线性有限元分析.对比分析表明:新型PBL键外包钢混凝土组合梁抗弯承载力的试验值、简化计算值和模拟分析值吻合较好.     

Investigating the Desirability of Navy Aircraft Service Life Extension Programs

Building on prior work on optimal replacement of aging aircraft, this paper presents three methodologies to evaluate prospective aviation Service Life Extension Programs (SLEPs) and applies these methodologies to US Navy F/A-18E/F data. While considerable uncertainty remains as to the values of key parameters (e.g. the cost of F/A-18E/F SLEPs), the preponderance of the evidence available at this juncture favors undertaking SLEPs on F/A-18E/Fs rather than replacing them with new Joint Strike Fighters.     

Economic Competition and Nuclear Cooperation

The number of bilateral nuclear cooperation agreements surged during the “nuclear renaissance” of the past decade. This proliferation is only partially explained by the prevailing approaches that focus on strategic imperatives. To supplement these explanations, this study draws on neoliberal models of economic competition to posit that bilateral agreement negotiations also exhibit conditions of “uncoordinated interdependence” and maneuvering to gain market share. Case evidence suggests the contours of supplier state bids for civilian assistance are determined at least as much by considerations about economic competition as they are by positive strategic goals. In addition, this study identifies several cases of cooperation where there appears to be little or no strategic motive for export agreements. The study concludes that patterns of economic competition and the influence of peers in defined competitive spaces alter material payoffs and impact policies. It also identifies a surprising role for principled restraint in dampening strategic and economic competition in some dyads.     

基于察打任务的无人机作战效能评估

首先根据时敏目标打击的特点,分析了察打任务模式下的察打一体无人机的作战使用。然后对评估体系中察打一体无人机的侦察能力与打击能力相关性进行了分析,同时将任务可执行度作为无人机效能评估的一项动态权衡标准,建立了基于察打任务的无人机效能评估模型,并基于效能指标体系建立了各分项模型。最后通过算例验证了模型的可行性。     

载机扰动下SAR/GMTI旋转目标微多普勒特性分析

目标微动部件激励的雷达微多普勒信号稳定而独特,反映了该目标的本质特征。针对采用相位中心偏置技术(DPCA)的SAR/GMTI系统,研究存在载机扰动下的旋转目标的微多普勒特性。构建飞行平台与微动目标的几何模型,推导旋转目标的微多普勒信号模型,分析典型的载机纵向扰动对微多普勒时频特性构成的影响;并通过仿真实验,验证了上述理论分析的正确性。     

基于红外辐射计的物体光谱发射率测量方法

发射率是测量红外辐射特性中的重要参数,直接影响测量的精度。在传统的能量法测发射率的基础上进行改进,利用红外辐射计MR170测量目标的光谱辐射亮度并在同一温度相同波段下建立一标准黑体模型,对目标光谱发射率进行求解。实验验证该方法可以获得满意的测量结果。对实验求取的光谱发射率进行误差分析,结果显示误差小于3%。     

Value management of diagnostic equipment with cancelation,no‐show,and emergency patients

Magnetic resonance imaging and other multifunctional diagnostic facilities, which are considered as scarce resources of hospitals, typically provide services to patients with different medical needs. This article examines the admission policies during the appointment management of such facilities. We consider two categories of patients: regular patients who are scheduled in advance through an appointment system and emergency patients with randomly generated demands during the workday that must be served as soon as possible. According to the actual medical needs of patients, regular patients are segmented into multiple classes with different cancelation rates, no‐show probabilities, unit value contributions, and average service times. Management makes admission decisions on whether or not to accept a service request from a regular patient during the booking horizon to improve the overall value that could be generated during the workday. The decisions should be made by considering the cancelation and no‐show behavior of booked patients as well as the emergency patients that would have to be served because any overtime service would lead to higher costs. We studied the optimal admission decision using a continuous‐time discrete‐state dynamic programming model. Identifying an optimal policy for this discrete model is analytically intractable and numerically inefficient because the state is multidimensional and infinite. We propose to study a deterministic counterpart of the problem (i.e., the fluid control problem) and to develop a time‐based fluid policy that is shown to be asymptotically optimal for large‐scale problems. Furthermore, we propose to adopt a mixed fluid policy that is developed based on the information obtained from the fluid control problem. Numerical experiments demonstrate that this improved policy works effectively for small‐scale problems. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 287–304, 2016     

The relevance of the Gulf of Guinea in global energy politics

Africa and for that matter the Gulf of Guinea cannot be indifferent to the global energy politics of the 21st century. The increasing importance of the region has attracted major actors in the energy sector. The competing interests of these actors are played out in various forms. This heightened interest in the region, especially with the discovery of oil in huge commercial quantities, has brought the importance of the area into focus in global oil politics. This paper looks at the importance of the region in light of the huge energy potentials of the Gulf of Guinea and how the institution of proper governance systems could serve as an important factor in ensuring the proper management of the resource.     

先进武装直升机的一种新型组合智能火/飞综合控制系统的设计与仿真

讨论了模糊逻辑控制与神经网络相结合的一种控制方法,给出了一种增益自适应调整的模糊控制方法和ＢＰ网络自适应变步长学习算法。提高了系统精度,改善了系统品质,并将这种方法成功地用于直升机综合火／飞系统的设计。同时,针对某型直升机用数字仿真证明了这种方法的优点和良好效果。