锂空（氧）气电池的研究概况及发展前景

本文概述了锂空（氧）气电池的研究进展,并对锂空（氧）气电池的未来发展前景作了展望。     

共沉淀法制备Nd:YAG纳米粉体的反应机理研究

以A1(NO3)3·9H2O、Nd(NO3)3·6H2O、Y(NO3)3·6H2O和NH4HCO3为原料,采用共沉淀法制备出纯相的Nd:YAG纳米粉体。借助FT-IR、TG/DTA、XRD等测试手段对前驱体和Nd:YAG纳米粉体进行了表征,根据表征结果,推断了合成机理与成相机理。研究结果表明:合成过程中Y和Al元素按照3:5的比例均匀沉淀下来,形成包裹型结构的前驱体4[Al(OH)3]·6[Al(OH)CO3]·3[Y2(CO3)3·3H2O]·3.74H2O,煅烧时无定型的前驱体经由六方结构和钙钛矿结构的YAlO3(YAP),在1000℃直接转变为立方结构的Nd:YAG纳米粉体,晶粒大小20nm左右。     

基于对比度最优的SAS图像自聚焦

合成孔径声纳（synthetic aperture sonar：SAS）成像中,主要通过自聚焦校正剩余相位误差。对比度最优自聚焦算法（contrast optimization autofocusing algorithm：COAA）是典型的参数化自聚焦方法,一般用于估计二次相位误差。SAS图像中的二次相位误差主要由前向速度偏差和视线方向加速度引起,本文将COAA用于校正SAS图像中由于速度偏差引入的二次相位误差。仿真和实测数据处理结果表明,对比度最优自聚焦算法可以有效补偿图像中的由于速度偏差引起的相位误差。     

算术编码理论及误差分析研究

文章主要对算术编码的编码理论和译码理论进行了详细阐述,具体分析了算术编码在实际译码中存在的误差,并说明了在算法中实现算术编码的基本思想。     

Superpave沥青混合料级配控制分析

从设计、生产、施工各个环节,对如何控制Superpave沥青混合料的级配进行了论述。通过认真分析原因,严格执行操作规范,加强各环节的检测,不断总结经验,可以对Superpave混合料的级配进行有效的控制。     

Across the waves: a bibliometric analysis of container shipping research since the 1960s

The paper investigates collaborative and semantic patterns that emerged between 1967 and 2013 about the theme of container shipping based on a corpus of 294 articles published in scholarly journals within the fields of transportation, supply chain, economics, geography, regional planning and development, and operations research. An analysis based on the co-occurrence of title words allows identifying dominant sub-themes and their evolution. Main results point to the gradual diversification of container shipping research, from the dominance of economics towards a more trans-disciplinary set of approaches which integrate port-related activities and multimodal networks. Yet, disciplinary specialization remains strong up to nowadays so that container shipping research remains rather fragmented. While co-authorships have increased over time, they remain polarized by few, weakly connected research battalions. Our study suggests that research on container shipping would benefit from more frequent contacts between such communities to foster in-depth cross-disciplinary studies and fundamental cooperation.     

公路与水路运输节能减排量化分析和比较

通过研究汽车与船舶的油耗特点,结合燃油种类与CO_2排放量的关系,建立了计算公路运输与水路运输单位耗油量与单位CO_2排放量的数学模型。通过敏感性分析,研究车速或航速与载货率对车辆或船舶单位CO_2排放量的影响。以从厦门港到盐田港的干散货运输为例,做了节能减排计算分析,并将结果与用其他方法获得的结果对比。在此基础上,对公路运输与水路运输节能减排做了敏感性分析研究,可以计算出能够体现水路运输节能减排优势的临界货运量。结果表明本文中介绍的方法能够为核算、比较公路运输与水路运输的节能减排效果提供更科学的量化参考。     

An integrated framework to jointly model decisions of activity time allocation and work-related travel

Five activity-travel choice dimensions, including three activity time allocation decisions and two work-related travel choices, are jointly modeled using the structural equation model in order to accommodate the complex interactions among them. Via a two-step estimation approach, the behavioral pattern underlying activity-travel decisions is explicitly revealed. For example, it demonstrates the priority with respect to subsistence activity, maintenance activity, and recreation activity due to a limited time budget; and bus commuting behavior positively influences the time allocated to the maintenance activity. In addition, two attitudinal factors are constructed and confirmed to have important effects on the five behavioral dimensions, which contribute to reveal the decision-making process from the perspective of psychology. This comprehensive framework is expected to provide important implications for mobility management and urban planning.     

Reliability Analysis of Filtering Reducers Considering Temperature Correction and Shock Load of Space

Owing to some excellent properties (such as large transmission ratio, high reliability, high precision, large stiffness, small volume and long service life), filtering reducers are suitable for occasions with high requirements (e.g. space equipment). However, the tough working condition in space (including frequent changes of temperature, and large temperature difference combined with shock loads) may significantly affect the reliability. In this paper, the expressions of the minimal and maximal instantaneous transmission ratios (ITRs) considering temperature correction are developed. The minimal and maximal ITRs from simulation are used to verify the accuracy. Moreover, the reliability of a filtering reducer under different temperatures and the shock load are calculated, respectively. The research is beneficial to the design of spacecraft mechanism.     

船舶动力定位系统级故障诊断技术

针对松散耦合的船舶动力定位系统分布式体系结构，提出了一种基于改进的二值PMC模型约分布式系统级故障诊断算法。采用自诊断与互诊断相结合的方法，给出了分布式诊断算法、图论模型、诊断内容及算法中使用的报文种类、故障向量。基于软件故障注入思想设计了四种故障，并对该算法进行了诊断验证。结果表明：改进的PMC模型适用，所提出约分布式系统故障诊断算法正确，故障诊断与验证应用程序可靠、实用。