摘要：The internal flow field of an axial-flow pump under low flow rate conditions is extremely turbulent. The unstable flow region is formed due to the tip leakage and the rotating stall, and is distinguished by a saddle patterned zone in its flow-head curve that demonstrates restrictions in its workable flow range. It is therefore important to understand and improve the operational characteristics of an axial-flow pump under low flow rate conditions. In this study, experiments are performed for the performances of an axial-flow pump at the flow rate in a range between 0.8Qd and 1.2Qd, with the internal flow field measured by the particle image velocimetry (PIV), and with the pump performances and the internal flow field simulated by the Ansys CFX. The simulation results agree well with the experimental results. From the predicted heads at the flow rate in the range between 0.1Qd and 0.7Qd by the numerical simulation, the complete flow-head curves are obtained. The streamlines and the velocity contours in the region in front of the impeller leading edge under different flow conditions are analyzed. By adopting the double-inlet structures, the flow-head characteristics are studied by varying the values of δ and σ respectively, where δ denotes the gap between the inner cylinder end and the impeller leading edge, and σ denotes the gap between the inner cylinder and the outer cylinder. The findings indicate that with the double-inlet design, the velocity distribution can be effectively improved in the region in front of the impeller leading edge, as well as the head performance under the low flow rate conditions, and the positive slope value of the head curve is reduced in the unstable flow range. The optimal δ and σ values are determined.

摘要：We develop here a simple wet chemistry to prepare covalent functionalized graphenes （FGs） through epoxide aminolysis espe- cially under alkaline aqueous condition. Remarkably, a series of typical monoamines, such as industrial Huntsman Jeffamine M-2070 and M-2005 polymer with hydrophilic or hydrophobic polyetheramine chains, positively-charged 2-amino-N,N,N- trimethylpropanaminium, negatively-charged sulfanilic acid, even oligopeptide sequence, can be effectively grafted on the platelets of graphene oxide precursor with covalent functionalization and partially reduced features. This strategy provides the researchers a facile and convenient approach to design and synthesize solution processable, biocompatible and functionalized graphenes for the potent applications in electronic inks, drug carriers and biomedicines. Expansion of the current study is actively ongoing in our laboratory.

摘要：秦腔是我国传统文化戏曲之一,具有深厚的文化底蕴和悠久历史。传统秦腔服饰华丽而讲究,在设计领域和艺术造型方面都有很好的造诣。本文探讨了将传统秦腔服饰视觉元素运用在皮革箱包设计上的各种可能和意义,为皮革箱包方面的设计拓展更多路径。

摘要：This research studied the mechanism of the corrosion resistance enhancement of artificially aged 7075 aluminium alloy using advanced Cs-corrected scanning transmission electron microscopy(STEM).The corrosion behaviors of artificially aged 7075 aluminium alloys in a 3.5 wt.%NaCl solution were investigated by impedance spectra,equivalent circuit analyses,polarization measurements and immersion *** results show that a longer aging treatment leads to better corrosion resistance,which can be attributed to the following microstructural features,as revealed by *** Cu segregation at grain boundaries under over-aged conditions helps retard intergranular *** Mg(Zn,Cu)_(2) precipitates formed on the surfaces of Al_(18)Mg_(3)(Cr,Mn)_(2) dispersoids effectively insulate the dispersoids as cathodes in corrosion,from the Al *** study demonstrates a potential strategy to design corrosion-resistant alloys achieved by proper alloying and subsequent aging.

摘要：Embedded phase-change random-access memory(ePCRAM)applications demand superior data retention in amorphous phase-change materials(PCMs).Traditional PCM design strategies have focused on enhancing the thermal stability of the amorphous phase,often at the expense of the crystallization *** this approach supports reliable microchip operations,it compromises the ability to achieve rapid *** address this limitation,we modified ultrafast-crystallizing Sb thin films by incorporating Sc dopants,achieving the highest 10-year retention temperature(~175℃)among binary antimonide PCMs while maintaining a sub-10-ns SET operation *** reconciliation of two seemingly contradictory properties arises from the unique kinetic features of the 5-nm-thick Sc12Sb88 films,which exhibit an enlarged fragile-to-strong crossover in viscosity at medium supercooled temperature zones and an incompatible sublattice ordering behavior between the Sc and Sb *** tailoring the crystallization kinetics of PCMs through strategic doping and nanoscale confinement,we provide new opportunities for developing robust yet swift ePCRAMs.

摘要：野外调查是生物多样性研究和保护的基础工作。在野外调查中,自然地理环境十分复杂,对相关地理信息的掌握程度、调查路线的设计质量和导航的准确性,直接影响调查工作的成效,甚至调查人员的人身安全。使用谷歌地球软件及相关数据转换工具,能获取海量遥感影像和地形数据,能将各种地理信息转换、编辑、叠加到三维地球模型上形成地理信息库,进而精细设计野外考察路线、调查点和调查样方,并以kml或kmz文件格式保存和分发设计结果。使用Android智能终端设备安装OruxMaps软件,可以将多种网络地图下载制作成离线地图,在卫星图上精确显示当前位置、记录走过的轨迹、导入kml或kmz文件进行导航。综合使用这些工具,可以实现良好的地理信息管理、精细的生物多样性野外调查路线设计和高精度现场导航实施,有效提高野外调查工作的成效和安全性。

摘要：我国是多自然灾害国家,极端天气下日益频发的多灾害给配电系统安全运行带来巨大威胁。新型配电系统建设背景下,配电网受灾对象范围拓展、致灾机理更加复杂、供电支撑多元化,多灾害地区配电网应具备对极端自然灾害的预防、感知、抵御、恢复等能力。以配电网为研究对象,阐述了多灾害地区概念及我国多灾害地区配电网地理分布情况,从多灾害地区配电网受灾机理与仿真技术、防灾规划设计技术、防灾运行与复电技术三个方面进行了详细梳理与讨论。在此基础上,从提升配电网长期本质防灾能力与满足短时应急供电需求的角度,总结多灾害地区配电网防灾能力提升技术的研究趋势,为建设新型配电系统、提升其防灾能力提供参考。

摘要：As an extension of environmental justice,landscape justice emphasizes achieving inclusive and equitable planning and design in both built and natural environments,allowing different social groups to enjoy and share landscape resources and benefits more *** endowing landscape design with a“just”orientation,landscape justice significantly improves the spatial and environmental benefits while promotes the process of environmental *** justice is characterized by its interdisciplinary nature,showing great variability in spatio-temporal scales,site dimensions and attributes,and social groups and scenarios,the research of which urgently requires in-depth dialogues,sincere collaborations,and active explorations among multiple *** call for enriching the connotation of landscape justice through interdisciplinary perspectives and addressing practical issues,to provide innovative spatial propositions and paths for creating sustainable urban environments and landscapes.

摘要：传统双层材料的弯曲理论主要针对小变形、线弹性材料.这里我们研究了双层条的大变形弯曲,建立了一个描述双层条大变形弯曲的理论.理论中假设双层条由一个主动层和一个被动层组成,只有主动层会产生各向同性体积膨胀.分析表明我们的理论预测与有限元模拟符合较好,而在某些情况下会与传统理论预测有明显的差异.我们理论分析还表明,存在能使双层条得到最大曲率的最佳模量比及厚度比.我们的理论可促进软质双层条带材的设计,可广泛用于多个领域.

摘要：Functional knowledge integration is the initial and core phase of a design process. It is the key phase to ensure that the functional requirement of the design product can be appropriately complied with, and its result is also the rudiment of the subsequent detailed design work. If this important phase can be supported by an increasingly distributed resource environment, and be automated such that its completion requires less manual work, the efficiency of the design process would be largely improved and its ability to promote innovation would be enhanced. Therefore, this study involved a detailed analysis of the functional knowledge integration of the design process, as well as the proposal of a corresponding running model. Based on the model, a computational algorithm and an evaluating method were established to automate functional knowledge integration. A corresponding computer program was developed to prove the feasibility of this approach, and it was used to design a solarpowered wiper blade.