摘要：We first present a new multi-modular shunt active power filter system suitable for large-capacity compensation. Each module in the system has the same circuit topology, system functionality, and controller design, to achieve coordination control among the modules. The module＇s reference signals are obtained by multiplying the total reference signal by the respective distribution coefficient. Next, a novel fault-tolerant approach is proposed based on split-phase control in the a-b-c frame and real-time bus communication. When a phase fault occurs, instead of halting the whole module, the proposed strategy isolates only the faulted bridge arm, and then recalculates the distribution coefficients and transfers the compensation capacity to the same phases of the other normal modules, resulting in a continuous operation of the faulted module and optimization of the remaining usable power devices. Through steady-state analysis of the post-fault circuit, the system stability and control reliability are proven to be high enough to guarantee its engineering application value. Finally, a prototype is established and experimental results show the validity and feasibility of the proposed multi-modular system and its fault-tolerant control strategy.

摘要：为改善预制混凝土构件钢筋连接工艺及性能,提出一种预制混凝土构件钢筋浆锚对接连接技术。针对该新型钢筋连接的传力可靠性问题,开展了考虑钢筋直径、混凝土强度和浆锚长度变化的接头单向拉伸试验。试验结果表明,钢筋浆锚对接连接接头受拉性能由钢筋浆锚长度与帮条钢筋承载力共同控制,与混凝土强度无明显关系,表现为帮条钢筋配置相同的条件下,12 mm、14 mm直径连接钢筋试件分别在0.5l a(受拉钢筋基本锚固长度)、0.6l a钢筋浆锚长度条件下实现钢筋拉断,16 mm直径连接钢筋试件在0.6l a钢筋浆锚长度条件下发生帮条钢筋拉断。结合数据分析,建议12~16 mm直径连接钢筋浆锚长度按0.6l a控制,帮条钢筋与连接钢筋牌号相同的前提下,12~14 mm直径连接钢筋的帮条钢筋按4 C 8设计,16 mm直径连接钢筋的帮条钢筋应按6 C 8设计。同时,试验中钢筋镦头构造可保证钢筋充分锚固,其具体尺寸可用于指导钢筋加工;螺旋筋对接头受拉性能影响不明显,可参照本次试验参数进行设计。

摘要：目的探究食品包装对消费者感知和偏好的影响。方法将包装元素分为尺寸、形状、材质、图片、文字等,通过总结营销学、营养学、心理学和食品科学等领域的相关研究,分别探究食品包装的不同元素对消费者食品消耗量的影响及其背后的心理机制。结果食品包装在很多情况下会影响人们的判断偏差,并最终导致食物过量消费。结论研究结果有利于设计出更合理的食品包装,减少食品摄入过量现象,引导更健康的包装食品消费。

摘要：针对当前在嵌入式平台上的三维重建实时性和点云配准精度下降的问题,提出了一种简单的位姿估计方法并在此基础上实现了基于视觉的三维重建。将差动式驱动的移动机器人运动简化为在同一时刻只有水平转动或者同一时刻只有直线平移。对分解后的两种运动形式采用不同的简化算法,在降低计算量的同时保证模型精度。通过基于标准数据集的离线实验和基于真实环境的机器人在线实现结果表明,提出的方法能够满足室内环境重建的精度和实时性。

摘要：为了提高并行遗传算法在大数据聚类问题中的时间效率,通过利用粗粒度遗传算法的并行化思想,提出了Hadoop平台上基于MapReduce计算框架的粗粒度遗传算法的并行化设计。该思想主要来源于大数据体量庞大的特点,聚类算法时间消耗巨大。并行是解决算力不足的一个较为有效的方法,实验结果表明,并行化的遗传算法在处理大数据聚类时相比传统的串行化处理在时间消耗方面有明显的降低。

摘要：针对某型号混凝土泵送机械用换向控制阀,选用38CrMoAl作为薄壁液压阀套,根据加工要求分析其车削过程中的难点。通过车削工艺的设计、刀具的选择、切削参数的制定和校验等方面的研究,采用正交试验方法考察加工表面粗糙度和刀具耐用度,优选合理的切削参数。经切削试验验证,加工的阀套内孔表面粗糙度为Ra1.2~1.6μm,且稳定性好。

摘要：Solid oxide fuel cells(SOFCs)have attracted a great deal of interest because they have the highest efficiency without using any noble metal as catalysts among all the fuel cell ***,traditional SOFCs suffer from having a higher volume,current leakage,complex connections,and difficulty in gas *** solve these problems,Rolls-Royce has fabricated a simple design by stacking cells in series on an insulating porous support,resulting in the tubular segmented-in-series solid oxide fuel cells(SIS-SOFCs),which achieved higher output *** work systematically reviews recent advances in the structures,preparation methods,perform-ances,and stability of tubular SIS-SOFCs in experimental and numerical ***,the challenges and future development of tubular SIS-SOFCs are also *** findings of this work can help guide the direction and inspire innovation of future development in this field.

摘要：In this study, the authors developed a new irrigation scheme based on the Noah land surface model, and then coupled it with the Weather Research and Forecasting regional climate model. Two simulations （with and without irrigation） were conducted over the Yellow River basin for the period April to October 2000-2010. The results indicated that the WRF model is able to successfully capture the spatial pattern and seasonal changes in observed temperature and precipitation over the Yellow River basin. When irrigation was induced, the mean surface air temperature at 2 m （T2m） decreased by 0.1-0.4 K, and there was a correspond increase （decrease） in latent （sensible） heat flux over the irrigated areas, wherein the increase （decrease） reached more than 10 W m-2 over the largest irrigated areas. The cooling effect was consistent with the changes in evapotranspiration and heat fluxes due to *** changes in lifting condensation level and planetary boundary layer height led to a greater probability of cloud formation and bore a close association with surface fluxes and soil moisture, which then impacted the spatial distribution of T2rn and precipitation.

摘要：针对快衰落信道环境下的无线通信正交频分复用系统中信道估计算法估计难度大、复杂度高等问题,提出一种轻量级的逐尺度卷积信道估计网络(scale-wise convolution channel estimation network,SCCENet)。对输入的信道状态信息矩阵下采样,构建多尺度特征金字塔,通过构建的逐尺度卷积部分以网络权重共享的方式对信道状态信息矩阵构成的多尺度特征金字塔进行不同尺度的特征融合,在不增加网络参数情况下增大感受野。仿真结果表明,该算法估计性能优于最小二乘算法,能以较低的估计复杂度取得相较于其它深度学习信道估计算法更低的估计误差。

摘要：目的:探讨乙酰肝素酶(HPSE)反义寡核苷酸(AS-ODN)对人鼻咽癌CNE-2细胞HPSE基因表达的影响及其细胞侵袭力的抑制作用。方法:设计合成HPSE AS-ODN转染CNE-2细胞进行培养24h,采用完整细胞原位杂交法检测CNE-2细胞HPSE mRNA表达;同时采用基质凝胶侵袭实验对转染CNE-2细胞的侵袭力变化进行检测。并设正常对照组和脂质体对照组。结果:AS-ODN各组的HPSE mRNA表达水平显著低于对照组,差异有统计学意义(P<0.05)。且AS-ODN各浓度组间的HPSE mRNA表达水平差异亦有统计学意义(P<0.05)。AS-ODN在终浓度分别为0.1μmol/L、0.2μmol/L和0.4μmol/L时对CNE-2细胞侵袭力抑制率分别为56.3%、78.7%和91.2%。结论:HPSE AS-ODN通过下调HPSE基因表达可显著抑制CNE-2细胞侵袭力。