基于IEC 61850的配网成套开关状态监测系统研制

为提高配网自动化资产管理水平,针对配网成套开关,研制出一种基于IEC 61850的状态监测系统。系统由就地传感器网络、状态监测IED(智能电子设备Intelligent Electronic Device,以下简称IED)、状态监测诊断系统组成,对配电成套开关设备的机械特性、热特性、绝缘特性进行监测、分析和诊断。状态监测系统遵循IEC 61850第二版状态监测逻辑节点建模,对内、对外通信采用IEC 61850标准通信服务,做到与配网自动化系统无缝结合,可与配电自动化终端(Distribution Terminal Unit,DTU)、配网自动化信息互动。实际工程应用效果表明,监测系统是有效和实用的,可对配网设备提出维护建议,极大减轻维护人员的负担,为配网馈线自动化、自愈功能提供一次设备状态信息,从而加快智能配电网建设。     

A novel pure red phosphor Ca8MgLu(PO4)7:Eu3+ for near ultraviolet white light-emitting diodes

A novel red-emitting phosphor Ca₈MgLu(PO₄)₇:Eu³⁺ was synthesized by a high-temperature solid-state reaction method. Its crystal structure, photoluminescence emission and excitation spectra, and decay time were investigated in detail. X-ray diffraction (XRD) results indicate that Ca₈MgLu(PO₄)₇ crystallizes in single-phase component with a whitlockite-like structure and the space group R3c of β-Ca₃(PO₄)₂. The emission spectrum shows a dominant peak at 612 nm due to the dipole ⁵D₀→⁷F₂ transition of Eu³⁺, and the luminescence intensity keeps increasing with increasing the content of Eu³⁺ to 100%. The excitation spectrum is coupled well with the emission of near ultraviolet (NUV) LED (380–410 nm). The CIE coordinates of Ca₈MgLu(PO₄)₇:Eu³⁺ phosphor is (0.654, 0.346), being close to the standard value of National Television Standard Committee (NTSC) for red phosphor, (0.670, 0.330). The internal quantum efficiency of the phosphor is 69% under the excitation of 394 nm. The results show that Ca₈MgLu(PO₄)₇:Eu³⁺ is a very appropriate red-emitting phosphor with a high ratio of red and orange for NUV-based white LEDs.     

Thermal resistance of side by side multi-chip package: Thermal mode analysis

The thermal mode analysis is used in this paper to optimize the thermal management with optimal locations and chip sizes for multi-chip package. The average thermal resistance is defined and analyzed. The spreading thermal resistance can be expanded into Fourier series so that the thermal modes can be established. For the infinite thermal modes, only a few terms are needed to be considered due to the rapid convergence of solution. The optimal locations and chip sizes can then be determined by using the first few modes to reduce the thermal resistance as minimal as possible. The optimal locations have the cosine wave property so that the wave nodes might be the suitable sites. On the other hand, the optimal chip sizes have the cardinal sine property which decays monotonously. For given optimal locations, the optimal chip sizes are determined by certain modes. These special modes can be used to analyze the range of optimal locations and chip sizes.     

现代混凝土增韧防裂原理及应用

从水泥基体和增强纤维两个方面综述混凝土增韧防裂的原理,分析增韧防裂技术的影响因素和作用效果,介绍了典型应用工程。从分子、微观和细观三个层次,阐述了纳米材料、有机高分子材料和聚合物对水泥基体增韧的作用机制。从纤维 基体界面作用力、裂缝形成和非稳态扩展抑制等方面,论述纤维种类和特性对混凝土硬化前后阶段增韧防裂的作用规律。基体增韧与纤维增韧相结合,能够提高混凝土的抗拉强度、拉伸应变和断裂能,并有效降低裂缝宽度,抑制裂缝扩展。     

工程管理前沿课程思政建设探索与实践

在深入了解课程思政的意义与内涵的基础上,以工程管理前沿作为试点课程,探讨了如何针对土木工程管理专业开展课程思政建设工作。根据课程教学主线,构建工程管理前沿课程思政教学体系及内容,提出便于思政内容融入专业课程的特适化教学组织方式与手段,实现课程教学效率的最大化。并通过问卷调查分析工程管理前沿课程思政建设的实际应用效果。结果显示,工程管理前沿课程思政探索与实践达到了预期目标,可以为相关专业的课程思政教育教学提供借鉴。     

Deformation characteristics and control for foundation pits in floodplain areas of Nanjing,China

Bulletin of Engineering Geology and the Environment - A comprehensive understanding of deformation characteristics and control measures for large-scale foundation pits in soft soil regions is of...     

Ex-ante evaluation of EU ETS during 2013–2030: EU-internal abatement

This study investigates CO₂ emission reduction within the EU resulting from the Emissions Trading Scheme (ETS) up to 2030. This is performed by constructing a baseline scenario without the ETS and assessing the impacts of the ETS, as currently designed. The results indicate that the ETS will start to impact emissions primarily after 2025 due to the prevalence of a sizable allowance surplus. The impact of approved (i.e. back-loading and 2.2% linear reduction factor (LRF)) and proposed (i.e. market stability reserve (MSR)) policy interventions and the inclusion of aviation, could accelerate the exhaustion of surplus and increase emission reductions during the investigated period. However, these measures would be insufficient to restore the scarcity of allowances and the corresponding carbon price before the start of ETS Phase IV, and the effectiveness of EU-internal abatement cannot be guaranteed until 2023. The effectiveness could be further reduced in the case of the economic shocks or the exclusion of international aviation.To restore the scarcity of allowances, other reform options are necessary. This paper extends the reasoning for the early removal of the back-loaded 900 Mtonne allowances by 2020 and broadening the scope of ETS to other sectors with potential high demand for allowances.     

一类新的能够渐进达到Gilbert-Varshamov界的Alternant子类码

本文基于Maximum Distance Separable(MDS)码的Hamming重量分布提出一类新的二元Alternant子类码.分析表明这类新的子类码包含整个BCH码类,并且可以渐进达到Gilbert-Varshamov(GV)界.     

资金约束下考虑碳配额质押融资的制造/再制造生产决策研究

本文研究资金约束下制造/再制造企业考虑碳配额质押融资的生产减排决策问题，构建了资金约束时不融资和进行碳配额质押融资两种利润模型，通过算例分析自有资金及减排效用参数对产量、碳排放量和总利润的影响。研究结果表明，进行碳配额质押融资能提高产量增加利润，但也可能导致碳排放总量的增加；企业减排能力与减排效用积累量正相关，资金不足时不融资减排效用积累值较小，选择融资可以为企业未来生产减排实现共赢奠定基础。