摘要：Using 20 models of the Coupled Model Intercomparison Project Phase 5 （CMIP5）, the simulation of the Southwest Indian Ocean （SWIO） thermocline dome is evaluated and its role in shaping the Indian Ocean Basin （IOB） mode following E1 Nifio investigated. In most of the CMIP5 models, due to an easterly wind bias along the equator, the simulated SWIO thermocline is too deep, which could further influence the amplitude of the interannual IOB mode. A model with a shallow （deep） thermocline dome tends to simulate a strong （weak） IOB mode, including key attributes such as the SWIO SST warming, antisymmetric pattern during boreal spring, and second North Indian Ocean warming during boreal summer. Under global warming, the thermocline dome deepens with the easterly wind trend along the equator in most of the models. However, the IOB amplitude does not follow such a change of the SWIO thermocline among the models; rather, it follows future changes in both ENSO forcing and local convection feedback, suggesting a decreasing effect of the deepening SWIO thermocline dome on the change in the IOB mode in the future.

摘要：The Vernohia anthelmintica L.＇s extract is one of the most popular Uygur medicines used for vitiligo. It is believed that the chalcone compounds of the plant play an important role in the treatment since they may activate tyrosinase and improve melanin production. In this study, twenty-one chalcones and nine analogues were synthesized in view of three different components of chalcone（A, B ring and a,b-unsaturated carbonyl）. After biological evaluation of their activity on tyrosinase in cell-free systems,the result showed that most compounds（except polyhydroxy chalcones） possess activator effect on the tyrosinase, especially for 13a–15a, 20 a and 1b, which bearing a comparable activity to the positive control8-MOP. SAR of these tyrosinase activator was summed up for the first time as well. Finally, compound 13 a was found to increase melanin contents and tyrosinase activity 1.75 and 1.3 fold, respectively, compared with that of untreated murine B16 cells at the concentration of 40 mg/m L.

摘要：为探讨老旧建筑安全性鉴定及抗震鉴定,采用理论结合实践的方法,立足老旧建筑面临的问题,以及安全性和抗震鉴定的必要性,分析安全鉴定和抗震鉴定的方法。分析结果表明,老旧建筑建成投入使用年限比较长,在人为因素、自然环境因素的联合影响下可能出现不安全情况,通过合理的安全性鉴定和抗震鉴定利于及时发现老旧建筑存在的问题,并为除险加固提供必要的参考和指导,从而提升老旧建筑的安全性,保障居民生命和财产安全。

摘要：氢气是一种清洁高效的能源载体,通过海水电解规模化制备氢气能够为应对全球能源挑战提供新的机遇。然而,缺乏高活性、高选择性和高稳定性的理想电极材料是在腐蚀性海水中连续电解过程的一个巨大挑战。为了缓解这一困境,需要从基础理论和实际应用两方面对材料进行深入研究。近年来,人们围绕电极材料的催化活性、选择性和耐腐蚀性进行了大量的探索。本文重点总结了高选择性和强耐腐蚀性材料的设计合成与作用机制。其中详细介绍了多种电极材料(如多金属氧化物、Ni/Fe/Co基复合材料、氧化锰包覆异质结构等)对氧气生成选择性的研究进展;系统论述了各种材料的抗腐蚀工程研究成果,主要讨论了本征抗腐蚀材料、外防护涂层和原位产生抗腐蚀物种三种情况。此外,提出了海水电解过程中存在的挑战和潜在的机遇。先进纳米材料的设计有望为解决海水电解中的氯化学问题提供新思路。

摘要：根据高温高强铜合金的设计思路,采用粉末冶金方法通过添加Cu-7.0Ni-1.75Si-0.5Cr合金制备基体强化的铜基复合材料,探究基体合金强化对复合材料组织形貌、力学性能和摩擦磨损性能的影响。结果表明:Cu-7.0Ni-1.75Si-0.5Cr合金在基体中析出Ni2Si和Cr3Si两种硬质相,且在基体中弥散分布;随着基体中Cu-7.0Ni-1.75Si-0.5Cr合金含量的增加,复合材料的硬度和压缩强度逐渐增加,最高分别达到45.9HBW和137.4 MPa,比铜基体分别提高了17.4%和17.7%;随着基体中Cu-7.0Ni-1.75Si-0.5Cr合金含量增加,复合材料的摩擦因数逐渐增加,过量的Cu-7.0Ni-1.75Si-0.5Cr合金使复合材料磨损量增加。当Cu-7.0Ni-1.75Si-0.5Cr合金含量为50%时,铜基复合材料摩擦磨损性能最佳。Cu-7.0Ni-1.75Si-0.5Cr合金对铜基复合材料具有良好的基体合金强化效果,能够有效改善其摩擦磨损性能。

摘要：鞭毛和纤毛独特的运动模式(如鞭毛的平面/螺旋波形式推进和纤毛的二维/三维不对称搏动)在众多生物的生命活动中起到至关重要的作用,这也启发了诸多仿生设计,尤其对于微型机器人系统。然而,与自然界中微生物能够从统一化的9+2轴丝生物结构中进化出多种运动模式不同的是,当前的仿生学仍然没有有效的工程策略去实现这样的智慧。在此,我们通过研究鞭毛和纤毛的内部结构及其内在驱动机制,推导出了一个统一的物理模型来描述微管弯曲及其所构建的宏观鞭毛/纤毛运动。基于该模型,我们进而提出了基于三通道的管状驱动概念,并相应地通过杆嵌入铸造工艺制造了一个三通道的管状驱动器。通过编程不同通道的驱动模式,这一管状驱动器不仅可以再现自然界中多样的二维及三维鞭毛/纤毛运动,还可以延展出更多的非对称纤毛搏动模式以实现低雷诺数下的有效推进。该研究加深了我们对微生物推进机制的理解,为仿生系统的设计提供了新灵感,并有望在广泛的工程领域中寻找到重要的应用场景。

摘要：This paper addresses the robust linear filter design issues for non-regenerative multiple input multiple output （MIMO） relay systems with imperfect channel state information （CSI） in both or partial hops. By considering statistical Kronecker channel model involving channel mean and antenna correlation, the robust linear processing schemes in imperfect CSI scenario for both hops are first derived based on mean squared error （MSE） criterion. In addition to this, the result is also extended to two practical scenarios, i.e. imperfect CSI for relay link with perfect CSI for access link and imperfect CSI for access link with perfect CSI for relay link. Simulation results show that the proposed scheme is capable of mitigating the performance degradation caused by the imperfect CSI.

摘要：【目的】影响力预测作为社交网络分析的重要内容,对于舆情监控、网络营销、情报分析、个性化推荐、广告定位、传播预测等多个领域具有重要的社会价值和现实意义。早期基于特征工程的影响力预测方法,通过提取并构建关键特征,建立不同特征与流行度之间的关系模型。本文重点关注与社交网络影响力相关的多类特征,从多类特征提取、预测模型构建和预测评估方法等方面进行了研究和综述,旨在综合分析已有研究方法,为提高社交网络影响力预测精度提供借鉴和参考。【方法】本文立足于当前广泛采用的深度学习方法,通过查阅文献资料,对社交网络的视觉特征、文本特征、情感特征、时间特征和用户特征分别进行了总结和阐述,并对基于多类特征的社交网络影响力预测方法的研究现状和局限性进行了分析。【结论】随着深度学习理论的发展,深度特征提取和预测模型构建取得了突破性进展,但目前在社交网络影响力预测方面,基于多类特征的特征组合预测方法仍然存在不足,需要研究更有效的特征预提取模型来提升社交网络影响力预测精度。

摘要：During advanced water detection using the transient electromagnetic method, the exploration effect for water-rich area is often poor due to the interference of bolts that are distributed in different positions in working face. Thus, the study on the interference characteristics of bolts in different states has important directive significance for improving the acquisition quality and data processing method in water detection. Based on the analysis of the distribution laws of magnetic field excited by small multi-turn coincident loop in full space of homogeneity, the test on the interference of bolts has been designed in the mine. Through drilling 18 holes around the overlapping coil in the working face, mass data are collected in order with the posi- tion change and the exposed bolt length. The results of comprehensive data analysis show that the transient electromagnetic field is strongly interfered as the distance between the bolt and the center of the coil is less than 3 m, and the interference varies greatly as the distance varies. On the other hand, the field induced by the bolts can be ignored as the distance exceeds 3 m. The findings can help to improve data acquisition and correction during advanced water detection when using the transient electromagnetic method.

摘要：本文利用微分对策理论研究了多寡头品牌和大类广告策略,发展了Bass等的双寡头竞争模型,提出了一个多方竞争下的微分对策模型,采用汉密尔顿-雅可比-贝尔曼方程求得了模型的均衡价格、品牌广告、大类广告和价值函数,给出了市场份额计算公式,推广了Prasad和Sethi的结论,同时发现市场中只有两家或三家企业时总能保证企业得到正利润,一旦企业数量增多则不能保证。