摘要：Excited-state double proton transfer(ESDPT)is a controversial issue which has long been plagued with theoretical and experimental ***,we took 1,8-dihydroxy-2-naphthaldehyde(DHNA)as a prototype and used combined complete active space selfconsistent field(CASSCF)and multi-state complete active-space second-order perturbation(MS-CASPT2)methods to investigate ESDPT and excited-state deactivation pathways of *** different tautomer minima of S1-ENOL,S1-KETO-1,and S1-KETO-2 and two crucial conical intersections of S1 S0-KETO-1 and S1 S0-KETO-2 in and between the S0 and S1 states were obtained.S1-KETO-1 and S1-KETO-2 should take responsibility for experimentally observing dual-emission *** addition,two-dimensional potential energy surfaces(2 D-PESs)and linear interpolated internal coordinate paths connecting relevant structures were calculated at the MS-CASPT2//CASSCF level and confirmed a stepwise ESDPT ***,the first proton transfer from S1-ENOL to S1-KETO-1 is barrierless,whereas the second one from S1-KETO-1 to S1-KETO-2 demands a barrier of ca.6.0 kcal/*** linear interpolated internal coordinate path connecting S1-KETO-1(S1-KETO-2)and S_(1) S0-KETO-1(S1 S0-KETO-2)is uphill with a barrier of ca.12.0 kcal/mol,which will trap DHNA in the S_(1) state while therefore enabling dual-emission *** the other hand,the S1/S0 conical intersections would also prompt the S_(1) system to decay to the S_(0) state,which could be to certain extent suppressed by locking the rotation of the C5-C8-C9-O10 dihedral *** mechanistic insights are not only helpful for understanding ESDPT but also useful for designing novel molecular materials with excellent photoluminescent performances.

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.

摘要：CoFe_(2)O_(4)has been widely used for electromagnetic wave absorption owing to its high Snoek limit,high anisotropy,and suitable saturation magnetization;however,its inherent shortcomings,including low dielectric loss,high density,and magnetic agglomeration,limit its application as an ideal *** study investigated a microstructure regulation strategy to mitigate the inherent disadvantages of pristine CoFe_(2)O_(4)synthesized via a sol–gel auto-combustion method.A series of CoFe_(2)O_(4)foams(S0.5,S1.0,and S1.5,corresponding to foams with citric acid(CA)-to-Fe(NO_(3))_(3)·9H_(2)O molar ratios of 0.5,1.0,and 1.5,respectively)with two-dimensional(2D)curved surfaces were obtained through the adjustment of CA-to-Fe^(3+)ratio,and the electromagnetic parameters were adjusted through morphology *** to the appropriate impedance matching and conductance loss provided by moderate complex permittivity,the effective absorption bandwidth(EAB)of S0.5 was as high as 7.3 GHz,exceeding those of most CoFe_(2)O_(4)-based ***,the EAB of S1.5 reached 5.0 GHz(8.9–13.9 GHz),covering most of the X band,owing to the intense polarization provided by lattice defects and the heterogeneous *** three-dimensional(3D)foam structure circumvented the high density and magnetic agglomeration issues of CoFe_(2)O_(4)nanoparticles,and the good conductivity of 2D curved surfaces could effectively elevate the complex permittivity to ameliorate the dielectric loss of pure CoFe_(2)O_(4).This study provides a novel idea for the theoretical design and practical production of lightweight and broadband pure ferrites.

摘要：由于场地、地质等因素的差异,使得地铁深基坑开挖过程中存在着许多复杂的问题,因此深基坑的稳定性显得尤为重要。研究拟以青岛地铁2号线佛耳崖站为对象,采用三维数值计算方法,对深基坑开挖及支护过程中地表及周边土体、邻近建筑物的变形进行有限元数值模拟,开展桩基+内部支撑系统(钻孔桩、钢支撑、混凝土支撑)受力与变形规律研究。结果表明:基坑开挖过程中,地表最大沉降量、基坑竖向位移、基坑水平位移分别为4.45 mm、20.34 mm、8.13 mm;桩体竖向位移和水平位移分别为7.59 mm、7.41 mm;支撑轴力、桩轴力与剪力最大值分别为1 385.82 kN、615.04 kN、221.25 kN,其可满足相关规范的设计要求。

摘要：针对输电线路中山区上覆土层、下卧岩层的地层条件,为增加桩基础抗拉拔性能,提出了一种锚固板钢筋锚固形式的斜锚短桩基础,开展了钢筋混凝土短桩-3向斜锚杆基础节点室内模型试验,研究了拉拔荷载作用下桩锚节点的受力特性与破坏机制。结果表明:短桩与锚筋协同工作,最先于锚杆节点处产生拉裂缝,进而形成竖向主裂缝不断向桩顶延伸,致使试件整体劈裂破坏。试件的开裂荷载约为150 kN、屈服荷载约为1611 kN、极限荷载约为1845 kN,破坏前锚筋全部屈服,桩内纵筋、箍筋均未屈服,斜锚表现出稳定的锚固性能。斜锚短桩基础受力较小时,桩锚间的锚固作用主要由钢筋直锚段的黏结作用承担;随着荷载逐渐增加,锚固作用则主要由锚固板端头的承压作用承担,锚杆肋间斜向应力与短桩相应位置斜截面切应力τ_α叠加,使得锚筋周围混凝土裂缝发生偏转,加剧混凝土裂缝向桩表面发展。研究成果可为复合型基础的设计提供借鉴,并为其变形特性与破坏机制研究提供参考。

摘要：With the increasing attention received by lightweight metals,numerous essential fields have increased requirements for mag-nesium(Mg)alloys with good room-temperature and high-temperature mechanical ***,the high-temperature mechanic-al properties of commonly used commercial Mg alloys,such as AZ91D,deteriorate considerably with increasing *** the past several decades,extensive efforts have been devoted to developing heat-resistant Mg *** approaches either inhibit the gen-eration of thermally unstable phases or promote the formation of thermally stable precipitates/phases in matrices through solid solution or precipitation *** this review,numerous studies are systematically introduced and *** alloy systems,includ-ing those based on Mg–Al,Mg–Zn,and Mg–rare earth,are carefully classified and compared to reveal their mechanical properties and strengthening *** emphasis,limitations,and future prospects of these heat-resistant Mg alloys are also pointed out and dis-cussed to develop heat-resistant Mg alloys and broaden their potential application areas in the future.

摘要：复合绝缘子被广泛应用于输电线路中,但其老化与断裂问题不容忽视。为研究复合绝缘子断裂故障成因和电热力老化机理,设计了电热力老化试验平台,对复合绝缘子芯棒短样进行多场耦合老化试验。结果表明:老化绝缘子芯棒样品出现了断裂现象。芯棒断裂过程中,宏观特征表现为裂纹和断裂面的扩大、高压电极附近出现放电痕迹等;微观特征表现为环氧分解、玻纤出现微裂纹并断裂、玻纤-环氧界面失效等。同时,依据单元断开率建立了电热力多场耦合断裂失效评估模型,揭示了单元断开率与能量势垒的反比关系。在给定的电、热和机械应力条件下,该模型可根据断裂面积比率实现复合绝缘子芯棒老化程度评估,能够为多应力协同作用下的复合绝缘子芯棒老化失效分析提供参考。

摘要：针对多源危险废物在协同焚烧过程中存在复杂的燃烧特性和交互反应,通过原料配伍和热重实验研究了轧钢油泥、油漆渣和树脂共混物的燃烧特性、动力学参数及相互作用,并通过建立人工神经网络模型(ANN)预测协同作用效果.研究表明:油泥Ⅰ、油泥Ⅱ、油漆渣、废树脂质量分数分别为20%、25%、40%和15%时共混物综合燃烧性能最佳,其最大失重速率为9.77%/min,并且提高加热速率有利于提升共混物燃烧性能.由动力学分析得到配伍3共混物活化能的变化趋势,在转化率为0.5时达到最大,随后急剧减小.此外,ANN 9-10模型的训练和测试R 2高达0.99,通过与实验结果对比验证,基本满足对相互作用效果的预测,该模型可以逆向指导和优化实验设计.

摘要：为了能够高效、快速解决国土空间规划管理工作中各类规划冲突,消除规划间的空间差异,在国土空间规划“一张图”建设的基础上,设计和开发了国土空间规划冲突检测处理系统。实践证明,该系统能够灵活自定义质检功能,提高规划数据质检的正确性,提供一键式检测处理工具,实现了规划数据快速冲突检测和量化处理,极大地提高了国土空间规划冲突检测和处理效率,提升了国土空间规划实施管理工作水平。

摘要：“电路分析基础”课程是电子信息类专业的一门专业基础课,其中动态电路时域分析与高中电学以及大学微积分紧密相连,是科学类课程向工程类课程过渡的重要纽带,其内容对应的实验是整个课程实验的重要组成部分。通过分析国内高校该部分实验教学现状,以电路故障为突破口,提出了虚实结合的动态电路时域分析实验教学方法,有望让学生在验证原理知识的基础之上深入理解电路原理,培养学生解决电路故障问题的能力,增强学生的动手实操能力,为学生创新能力和综合素质的提高发挥重要作用。