摘要：Developing excellent pseudocapacitive electrodes with long cycle,high areal capacity and large rate has been challenged.3 D printing is an additive manufacture technique that has been explored to construct microelectrodes of arbitrary geometries for high-energy–density *** comparison with conventional electrodes with uncontrollable geometries and architectures,3 D-printed electrodes possess unique advantage in geometrical shape,mechanical properties,surface area,especially in ion transport and charge ***,a desirable 3 D electrode with ordered porous structures can be elaborately designed by 3 D printing technology for improving electrochemical capacitance and rate *** this work,a designed,monolithic and ordered multi-porous 3 D Cu conductive skeleton was manufactured through 3 D direct ink writing technique and coated with Cu O nanosheet arrays by an in situ electro-oxidation *** from the highly ordered multiporous nature,the 3 D-structured skeleton can eff ectively enlarge the surface area,enhance the penetration of electrolyte and facilitate fast electron and ion *** a result,the 3 D-printed Cu deposited with electro-oxidation-generated CuO(3 DP Cu@Cu O)electrodes demonstrates an ultrahigh areal capacitance of 1.690 F cm^(-2)(38.79 F cm^(-3))at a large current density of 30 m A cm^(-2)(688.59 m A cm^(-3)),excellent lifespan of 88.20%capacitance retention after 10,000 cycles at 30 m A cm^(-2) and superior rate capability(94.31%retention,2-30 m A cm^(-2)).This design concept of 3 D printing multi-porous current collector with hierarchical active materials provides a novel way to build high-performance 3 D microelectrodes.

摘要：In this paper, a bias-eliminated subspace identification method is proposed for industrial applications subject to colored noise. Based on double orthogonal projections, an identification algorithm is developed to eliminate the influence of colored noise for consistent estimation of the extended observability matrix of the plant state-space model. A shift-invariant approach is then given to retrieve the system matrices from the estimated extended observability matrix. The persistent excitation condition for consistent estimation of the extended observability matrix is analyzed. Moreover, a numerical algorithm is given to compute the estimation error of the estimated extended observability matrix. Two illustrative examples are given to demonstrate the effectiveness and merit of the proposed method.

摘要：针对拖拉机发动机供油结构进行了优化设计和试验研究。首先,介绍了拖拉机发动机供油系统的组成部分和工作原理,分析了供油系统存在的问题;然后,提出了一种改进的供油结构设计方案,并基于响应面法进行优化试验。试验结果表明:通过分析得到优化结果为转速3 000 r/min、旋转油道直径6 mm、油路压力120 MPa,此时理论摩擦功耗为60.09%,端泄流量为0.602,满足生产要求。研究结果为拖拉机发动机供油系统的优化设计提供了参考依据,具有一定的理论和实际意义。

摘要：装载机负载敏感液压系统通过压力补偿作用来维持多路阀前后压差的恒定,补偿压差的存在会造成一定的能量损失,降低系统效率和元件的使用性能及寿命。鉴于此,设计提出了增加节能控制阀来降低多路阀补偿压差的节能负载敏感液压系统,利用AMESim仿真软件建立仿真模型并进行分析研究。结果表明,在相同的工况下,改进后的负载敏感系统能够降低工作时多路阀的能量损耗,提高系统及元件的性能及使用寿命。

摘要：设计了隧道多功能作业台车工作装置液压系统的关键回路—联动调平回路,利用AMESim和MATLAB软件对该系统进行联合仿真,分析仿真数据可知:系统回路和阀件选型在当前设计下能够满足实际工况要求。

摘要：设计了一款抗辐射16位25 MS/s流水线型模数转换器(ADC)。根据电容失配等因素确定了第一级4位的流水线结构,并设计了改进的自举开关来提高采样线性度。为了降低系统功耗,设计了一种开关电容动态偏置电路,通过减小放大器的平均电流来降低ADC的系统功耗。为了满足抗辐射的要求,针对电离总剂量效应和单粒子闩锁效应的机理,对电路进行抗辐射加固设计。该款抗辐射ADC在0.18μm CMOS工艺上进行制造,转换器的芯片面积为2.5 mm^(2),经过辐射试验后,在采样率25 MHz、1.8 V电源电压和30.1 MHz正弦输入的条件下,ADC的信噪比(SNR)达到了76.7 dBFS,无杂散动态范围(SFDR)为95.1 dBFS,功耗为38.76 mW,抗辐射能力达到电离总剂量100 Krad(Si)和单粒子闩锁阈值75 MeV·cm^(2)/mg,可满足空间环境的使用要求。

摘要：A hertz-linewidth ultra-stable laser(USL), which will be used to detect the clock transition line, in a strontium optical clock will be launched into the China Space Station(CSS) in late 2022. As the core of the USL, an interference-filter-based externalcavity diode laser(IF-ECDL) was developed. The IF-ECDL has a compact, stable, and environmentally insensitive *** of the IF-ECDL are presented. The developed IF-ECDL can pass the aerospace environmental tests, indicating that the IF-ECDL can be suitable for space missions in the CSS.

摘要：阀后补偿负载敏感液压系统中关键元件压力补偿阀通过阀前后补偿压差来调节流量,因而会造成一定的能量损失,降低系统效率的同时元件使用性能及寿命也大大降低。鉴于此,提出一种以串联液阻分压来降低补偿压差的节能阀后补偿负载敏感液压系统。利用AMESim仿真软件建立仿真模型并进行仿真分析。结果表明:在相同的工况下,改进后的负载敏感系统,能够降低工作时压力补偿阀的能量损耗,提高系统及元件的性能及使用寿命。所得结论为阀后补偿负载敏感液压系统的优化设计提供了参考。

摘要：非溶剂致相分离技术由于其制膜工艺简便且对膜结构调控手段多样化,在制备高通量、具有选择性筛分特性的纳滤膜上具有显著优势。然而如何进一步提升相转化纳滤膜的分离精度及渗透系数,仍受国内外学者广泛关注。本文首先系统阐述了相转化过程中,铸膜液热力学性质及成膜动力学对膜结构及性能的影响机理。其次总结了传统膜材料,如聚砜、聚醚砜等材料在纳滤膜制备中的研究进展。然后重点分析了两亲性嵌段共聚物材料的特点及在相转化纳滤膜制备中的突出优势。最后,本文展望未来制备高性能相转化纳滤膜的发展方向。

摘要：纳滤是一种介于超滤与反渗透之间的重要膜分离过程,具有工作压力低、无相转变及分离效率高等独特优势。膜污染及渗透性/选择性之间的平衡是纳滤膜在使用和研发过程中面临的亟待解决的两个主要问题。膜材料是膜与膜分离技术的核心,开发新型的纳滤膜材料是解决上述问题的重要手段。本文从新型纳滤膜材料的设计与选择的角度出发,总结归纳了近年来新型材料在纳滤膜的制备与应用研究现状,包括新型有机纳滤膜材料、新型无机纳滤膜材料和新型有机-无机杂化纳滤膜材料三个方面,拓展了对纳滤膜材料的认知,探讨了新型纳滤膜材料的共性及其存在的主要问题,并对未来高性能纳滤膜材料的研制方向进行了展望。