摘要：本文设计了一种Cu纳米颗粒(NPs)修饰TiO2空心球壳的新型光催化剂(Cu/TiO2),这种金属/半导体光催化剂在紫外光和可见光下均能实现高效光催化全分解水.在报道过的TiO2基光催化剂中,Cu/TiO2的可见光全分解水活性处于最高水平.有趣的是,Cu和TiO2形成的金属/半导体结可以通过调节入射光波长(紫外光或可见光)来控制改变光催化分解水反应路径,进而实现对水氧化产物(H2O2或O2)的选择.在紫外光照射下,TiO2上的光生电子在Cu/TiO2肖特基结的作用下被Cu NPs捕获,并参与水还原反应产生H2,留在TiO2上的光生空穴通过两电子过程参与水氧化反应产生H2O2;在可见光下,Cu NPs的局域表面等离子共振(LSPR)效应发挥作用,产生热电子并将其注入至TiO2中,参与水还原反应产生H2,Cu NPs产生的热空穴通过四电子过程参与水氧化反应产生O2.这种功能可切换的金属/半导体结的设计可以对研究和理解光催化全分解水反应机理提供帮助.

摘要：Three-dimensional(3D)bioprinting is a powerful approach that enables the fabrication of 3D tissue constructs that retain complex biological ***,the dense hydrogel networks that form after the gelation of bioinks often restrict the migration and proliferation of encapsulated ***,a sacrificial microgel-laden bioink strategy was designed for directly bioprinting constructs with mesoscale pore networks(MPNs)for enhancing nutrient delivery and cell *** sacrificial microgel-laden bioink,which contains cell/gelatin methacryloyl(GelMA)mixture and gelled gelatin microgel,is first thermo-crosslinked to fabricate temporary predesigned cell-laden constructs by extrusion bioprinting onto a cold ***,the construct is permanently stabilized through photo-crosslinking of *** MPNs inside the printed constructs are formed after subsequent dissolution of the gelatin *** MPNs allowed for effective oxygen/nutrient diffusion,facilitating the generation of bioactive ***,osteoblast and human umbilical vein endothelial cells encapsulated in the bioprinted large-scale constructs(≥1 cm)with MPNs showed enhanced bioactivity during *** 3D bioprinting strategy based on the sacrificial microgel-laden bioink provided a facile method to facilitate formation of complex tissue constructs with MPNs and set a foundation for future optimization of MPN-based tissue constructs with applications in diverse areas of tissue engineering.

摘要：Due to the increasing amount of photovoltaic (PV)-based power generation being connected to power systems, issues pertaining to the integration of the PV-based generators have attracted intense attention. In this connection, the design of a PV-based stabilizer for enhancing power system dynamic stability is examined. The damping action is achieved through the independent control of real power flow from the stabilizer and voltage at the point of common coupling between the stabilizer and grid system. The stabilizer system is designed based on classical frequency response technique. Robustness of the proposed control strategy in enhancing network dynamic stability is demonstrated through computer simulation.

摘要：This paper proposes an additive nanomanufacturing approach to fabricate a personalized lab-on-a-chip fluorescent peptide nanoparticles (f-PNPs) array for simultaneous multi-biomarker detection that can be used in Alzheimer’s disease (AD) diagnosis. We will discuss optimization techniques for the additive nanomanufacturing process in terms of reliability, yield and manufacturing efficiency. One contribution of this paper lies in utilization of additive nanomanufacturing techniques to fabricate a patient-specific customize-designed lab-on-a-chip device for personalized AD diagnosis, which remains a major challenge for biomedical engineering. Through the integrated bio-design and bio-manufacturing process, doctor’s check-up and computer-aided customized design are integrated into the lab-on-a-chip array for patient-specific AD diagnosis. In addition, f-PNPs with targeting moieties for personalized AD biomarkers will be self-assembled onto the customized lab-on-a-chip through the additive nanomanufacturing process, which has not been done before. Another contribution of this research is the personalized lab-on-a-chip f-PNPs array for AD diagnosis utilizing limited human blood. Blood-based AD assessment has been described as “the holy grail” of early AD detection. This research created the computer-aided design, fabrication through additive nanomanufacturing, and validation of the f-PNPs array for AD diagnosis. This is a highly interdisciplinary research contributing to nanotechnology, biomaterials, and biomedical engineering for neurodegenerative disease. The conceptual work is preliminary with intent to introduce novel techniques to the application. Large-scale manufacturing based on the proposed framework requires extensive validation and optimization.

摘要：目的:目前大中型控制阀大多存在结构复杂、驱动能耗大、反应时间慢、振动噪声大、稳定性差和使用寿命短等缺点。基于此,浙江大学相关研究人员组建了特种控制阀研究室,致力于提升控制阀的整体性能和设计水平。研究点:本研究室的主要方向为:1.控制阀内部流动特性分析和新结构设计开发;2.流体目标流量、温度、压力和振动噪声等的智能控制研究;3.适应纳米流体、压缩氢气和高温高压过热蒸汽等新流体介质的智慧控制阀研究。展望:特种控制阀作为超超临界火电机组、核电、石化高压反应和百万吨级乙烯工程等国家重大重点工程的关键零部件之一,将会在内流动机理、新结构开发、新流体介质和智能控制等研究领域得到广泛关注和长足发展。

摘要：The structural design of the IND100 axial compressor requires a multistage interrelationship between the thermodynamic, aerodynamic, mechanical design and structural integrity analysis of the component. These design criteria, sometimes act in opposition, hence engineering balance is employed within the specified design performance limits. This paper presents the structural and conceptual design of a sixteen stage single shaft high pressure compressor of IND100 with an overall pressure ratio of 12 and mass flow of 310 kg/s at ISOSLS conditions. Furthermore, in order to evaluate the conceptual design analysis, basic parameters like compressor sizing, load and blade mass, disc stress analysis, bearings and material selections, conceptual disc design and rotor dynamics are considered using existing tools and analytical technique. These techniques employed the basic thermodynamic and aerodynamic theory of axial flow compressors to determine the temperature and pressure for all stages, geometrical parameters, velocity triangle, and weight and stress calculations of the compressor disc using Sagerser Empirical Weight Estimation. The result analysis shows a constant hub diameter annulus configuration with compressor overall axial length of 3.75 m, tip blade speed of 301 m/s, maximum blade centrifugal force stress of 170 MPa, with major emphasis on industrial application for the structural component design selections.

摘要：Based on the platform of mobile carrier satellite tracking has a wide range of applications. The paper adopts the advanced method of to step response identify, using the data obtained by the experiment model of high-speed acquisition, using the method of the least squares, finally the antenna control system model function was identified. Make use of integral separation algorithm, simu- link simulation and experiment analysis to set the control parameters of it. Stimulate the signal antenna control system under inter- fering. The experiment of the simulation experiment showed that the antenna control system model is stable with little error.

摘要：工作在红外波段的砷化镓(GaAs)基纳米线激光器在集成光电子学中起着重要作用.在过去的十几年中,纳米线激光器领域发展迅速,但是与工作在紫外和可见波段的材料相比,由于GaAs基材料的特性,近红外激光器的实现相对困难.在本文中,我们着重介绍了GaAs基纳米线的最新进展,特别是GaAs纳米线的光学性质和激射特性.详细介绍了GaAs纳米线的生长机理,包括晶相控制和复杂结构的生长.回顾并讨论了GaAs基纳米线的光学性质的影响因素和改进方法.最后,展示了GaAs基纳米线激光器的设计及其最新进展.

摘要：An all-optical 2-to-4 decoder unit with the assist of terahertz optical asymmetric demultiplexer (TOAD) is presented. The all-optical 2-to-4 decoder with a set of all-optical switches is designed which can be used to achieve a high-speed central processor unit using optical hardware. The unique output lines can be used for all-optical header processing. We attempt to develop an integrated all-optical circuit which can perform decoding of signal. This scheme is very simple and flexible for performing different logic operation and to design advanced complex logic. Simulated results are confirming the described methods.

摘要：气膜冷却是一种应用广泛且有效的透平冷却方式。传热系数是气膜冷却的主要特征物理量之一,直接影响到热端部件的壁面温度。发展气膜冷却传热系数的高精度、高效率测量方法对气膜冷却特性的研究和冷却设计具有重要意义。本文针对平板气膜冷却传热系数稳态测量方法,通过雷诺时均(RANS)数值模拟,研究了平板背部固体导热损失对传热系数测量结果精度和测量过程效率的影响机制。研究表明,背部保温材料的厚度直接影响到平板背部固体导热过程,进一步导致对于测试结果精度和系统达到稳态的时间(即测量效率)的影响;对于某个特定的气膜传热系数测量实验来说,存在着一个“最佳”的保温材料厚度范围。在此基础上,本文提出了进一步兼顾平板气膜冷却传热系数稳态测量精度与效率的方法。