钢骨混凝土框架结构施工质量控制中的监理体会

以实际案例介绍对钢骨混凝土结构施工质量控制的难点、重点所采用的方法,说明了监理人员在工程质量控制中发挥主动性的重要。     

Partial segmented compressed sampling for analog-to-information conversion

Recently, a segmented analog-to-information conversion (S-AIC) structure that can obtain more samples than the number of branches of mixers and integrators (BMIs) is proposed by Taheri and Vorobyov. To reduce the complexity of S-AIC, in this paper we propose a partial segmented AIC (PS-AIC) structure, where BMIs are divided into groups and each group only works within a partial period that is non-overlapping in time. The proposed PS-AIC offers an attractive tradeoff between the complexity and error performance. We also prove that the equivalent measurement matrix of PS-AIC satisfies the restricted isometry property. Simulations verify the effectiveness of PS-AIC.     

Mechanical properties of biomimetic ceramic with Bouligand architecture

Biomimetic Bouligand architecture is constructed in the ceramic to improve its toughness. Firstly, unidirectional carbon fiber-reinforced ZrB₂-SiC ceramic films are achieved through a vacuum-assisted filtration method using graphene oxide. Then, ceramic films are helically assembled at a fixed angle of 30° in the graphite die based on the fiber orientation. Finally, the spark plasma sintering method was utilized to densify helical assembly carbon fiber/ceramic films. By constructing Bouligand structure, high fracture toughness (7.4 MPa·m^0.5) and work of fracture (∼1055 J/m²) are achieved in ZrB₂-based ceramic. The toughening mechanisms mainly are crack deflection, twisting and branching, carbon fiber pulling out, and bridging.     

谈常绿植物在园林中的应用

常绿植物对于园林绿化的效果有着很大的影响，可以有效提高园林绿化的质量，不仅美化环境，同时还可以保护生态环境，为人们的生活增添色彩。本文首先论述了常绿植物在园林中配置的原则，然后以辽阳市为例探讨了常绿植物在园林中的应用，供相关工作人员参考和借鉴。     

风储共存于配网的动态优化潮流分析

为适应未来电网发展,在日前时间级,建立以向输电网购电量最小为目标的风储共存配网动态优化潮流的数学模型。该模型在配网原有条件的基础上,考虑了普通异步风电系统、双馈感应风电系统和蓄电池储能系统的特性和限制条件。基于GAMS平台,通过调用CONOPT求解器对该模型进行求解。以12节点风储共存的配网为例,对多种方式进行机制分析发现,普通异步风电系统、双馈感应风电系统和蓄电池储能系统共存于配网中运行时,可解决有功、无功和电压间存在相互牵制的矛盾,考虑风储运行特性的动态优化可更有效地接纳风电,使资源得到有效配置。     

基于直流供电技术的电压暂降保护系统研究

变频器在软启动、变频调速、优化设计、经济运行等方面具有明显优势,得到广泛应用。在电压暂降期间,变频器会因低压保护而跳闸,造成连续性生产企业非计划停运,带来巨大的经济损失和事故。根据变频器交-直-交的特性,结合电力电子技术,研究开发了两种基于直流供电技术的电压暂降保护系统。两种保护系统分别利用电网残压和蓄电池组作为能量来源,通过Boost DC/DC变换器,输出恒定的直流电压,为变频器直流母线提供恒定的直流电。实验数据和现场应用表明,该两种电压暂降保护系统可以确保变频器在电压暂降期间正常运行,大大提高了供电可靠性,为用户避免了大量的经济损失。     

基于电网固有结构特性的配电网最优无功补偿方法

提出了一种基于电网固有结构特性的配电网最优无功补偿方法。首先根据无功就地平衡的原则,以无功补偿节点为分解点划分子系统,并在子系统内基于电网固有结构特性确定无功补偿容量,以此确定系统运行的最优补偿,然后在有无功补偿容量受限的情况下,采用启发式的回推算法修正补偿方案,最后基于电网结构调整以顺应系统源流特性的原则,确定最终的无功补偿方案。算例分析验证了所提方法的准确性和计算效率。所提方法不仅可用于配电网电容器快速最优投切决策,还对配电网最优无功补偿配置具有重要作用,具有良好的实际应用前景。     

Thermal Shock Resistance of Laminated ZrB2–SiC Ceramic Evaluated by Indentation Technique

In this work, the thermal shock behavior of laminated ZrB₂–SiC ceramic has been evaluated using indentation‐quench method based on propagation of Vickers cracks and compared with the monolithic ZrB₂–SiC ceramic. The results showed that the laminated ZrB₂–SiC ceramic exhibited better resistance to crack propagation and thermal shock under water quenching condition, and the critical temperature difference (ΔT_c) of laminated ZrB₂–SiC ceramic (ΔT_c ≈ 590°C) was much higher than that of monolithic ceramic (ΔT_c ≈ 290°C). The significant improvement in thermal shock resistance was attributed to residual stresses enhancing the resistance to crack growth during thermal shock loading.     

基于惯性传感器MPU6050的滤波算法研究

针对运动体姿态角测量问题,利用惯性传感器MPU6050提出了一种参数可调的自适应显性互补滤波算法,并与经典互补滤波、显性互补滤波、基于梯度下降法的互补滤波算法及传感器数字运动处理器自带滤波算法进行了比较,分析了几种算法在工程应用中的适应性。测试结果表明,此类互补滤波算法具有思路清晰,计算量小,估算精度高及易实现等特点,改进后的算法综合性能最优,适用于各种运动姿态测量系统。