摘要：Based on orthogonal experiments,the effects of voltage,frequency,duty ratio and their interactions on the thickness and corrosion resistance of coatings prepared by plasma electrolytic oxidation(PEO)on aluminum in an alkaline silicate-containing electrolyte were *** thicknesses of these coatings were obtained by measuring their cross-section using Image J *** corrosion resistances were evaluated in HCl and NaCl media through spot test and electrochemical *** results show that the experimental design of this study is the key to investigate the interactions among these electrical ***,not only each independent factor,but also their interactions exhibit a remarkable influence on the *** combination of high voltage,low frequency and large duty ratio significantly increases the coating thickness and content of the corrosion resistance phase,and thus improves the corrosion resistance of the coating in HNO3 ***,the coating possessing the densest microstructure and best corrosion resistance in NaCl medium is obtained when low voltage and high frequency match with a small duty ratio.

摘要：V_(2)O_(5),which has multicolor and energy storage properties,is a promising electrochromic material for multifunctional electrochromic devices,but its practical application is limited by its poor lifespan and long switching *** this work,high-performance V_(2)O_(5)/TiO_(2)films were fabricated by spraying a V_(2)O_(5)solution on in situ-grown TiO_(2)*** to the porous structure formed between the TiO_(2)nanorods and the remarkable electron transfer performance of TiO_(2),the switching time of the V_(2)O_(5)/TiO_(2)films ***,the strong adhesion between the TiO_(2)nanorods and F-doped tin oxide(FTO)glass and the increased surface roughness of the substrates significantly improved the cycling stability of the V_(2)O_(5)/TiO_(2)*** a large transmittance modulation(47.8%at 668 nm),fast response speed(τ_(c)=5.1 s,τ_(b)=4.2 s),and long lifespan,V_(2)O_(5)/TiO_(2)films were used as electrodes for the electrochromic energy storage device(EESD),which switched in six colors through color overlay:dark orange,sandy yellow,green-yellow,yellow-green,dark green,and dark *** by pixel displays,EESDs were designed by segmenting V_(2)O_(5)films to stagger the display of the electrochromic and ion storage layers,which presented 11 types of information based on different combinations of *** work provides inspiration for developing multifunctional electrochromic devices,especially for camouflage and information displays.

摘要：基于表面等离激元受激辐射放大(SPASER)机制,提出了一种硅-金-硅三层核壳偏心纳米天线,并利用有限元法分析了其多波长散射特性.结果表明:在SPASER机制下,该纳米天线产生极大的散射光强度,且工作波长的数目随着硅核偏心率的增加而增加;当硅核的偏心率为9nm时,该纳米天线有4个共振峰,分别位于615nm、656nm、724nm、847nm,其对应的散射强度比非SPASER机制的纳米天线的散射强度高104倍;该纳米天线的散射波长还可以通过改变入射光的偏振角调节.基于SPASER机制的纳米天线对于设计多波长纳米激光器具有指导意义.

摘要：Photophysical processes occurring within organic semiconductors is important for designing and fabricating organic solar *** phthalocyanine(CuPc)is a typical electron *** this work,the triplet exciton lifetime is prolonged by altering the molecular stacking pattern of the CuPc *** CuPc thin films,the excited state decays are mainly determined by the triplet-triplet annihilation *** ultrafast transient absorption measurements indicate that the primary annihilation mechanism is one-dimensional exciton diffusion collision *** decay kinetics show a clearly time-dependent annihilation rate constant withγ∝t^(-1/2).Annihilation rate constants are determined to beγ0=(2.87±0.02)×10^(-20)cm^(3)·s^(-1/2)and(1.42±0.02)×10^(-20)cm^(3)·s^(-1/2)for upright and lyingdown configurations,*** to the CuPc thin film with an upright configuration,the thin film with a lying-down configuration shows longer exciton lifetime and higher absorbance,which are beneficial to organic solar *** results in this work have important implications on the design and mechanistic understanding of organic optoelectronic devices.

摘要：作物的生长冗余,也就是营养器官的过度生长,常常对作物产量不利,因此被称为作物的‘公地悲剧’。作物品种内相邻植株之间的资源竞争也会导致可塑性的营养器官的过度生长,因此被称为可塑性的公地悲剧。然而,目前有关这种可塑性的公地悲剧如何响应不同作物品种和不同的资源水平的研究较少。本研究设计了盆栽实验来探索这一问题。为设置根系竞争和无竞争两种处理,把同品种两个植株栽种在同一花盆中,分别用尼龙和塑料进行隔离;采用了两个小麦品种(古老品种和尚头和现代品种92-46),设置了两个资源水平处理。研究结果表明,与92-46相比,和尚头品种把资源更多地分配给茎叶,更少地分配给种子。异速生长数据显示,在24对尼龙隔离和塑料隔离处理的比较中,只有4对显示出程度很小的差异。异速生长数据还显示,相比和尚头品种,92-46品种对增加资源的响应程度更小。基于有限样本大小,本研究揭示了作物地上部分营养生长和繁殖生长之间的权衡关系。正是这种权衡关系,导致了和尚头小麦品种的‘公地悲剧’式生长,同时也使得92-46小麦品种的种子产量得以提升。小麦的公地悲剧更可能是源自遗传性状(比如古老品种的生长冗余),而不太可能是源自植株的可塑性冗余生长。现代小麦品种92-46可能采用了节约型的资源利用方式,而古老品种则采取的是消耗型策略。综上所述,本研究表明育种工作者应当选育个体竞争力低的基因型。

摘要：To meet the requirements of high performance, low cost, and easy operation of the robot, a brushless motor drive and control system for the robot joint is designed, including CAN bus, WPF upper host computer development, and magnetic encoders, and other sensors, in which the STM32 F103 chip is used as the main control chip, and the DRV8323 is a brushless motor drive chip. The principle of field-oriented control(FOC) brushless motor drive is ***, the drive and control system design is completed from both hardware and software aspects. Finally, the PID algorithm is used for the closed-loop speed test of the robot joint. The experimental result shows that the designed robot joints and control system run smoothly and reliably, have the characteristics of modularization and miniaturization, and are suitable for the control of micro-service robots and manipulators.

摘要：High-temperature proton exchange membrane(HT-PEM)fuel cells offer more advantages than low-temperature PEM fuel *** ideal characteristics of HT-PEMs are high conductivities,low-humidity operation conditions,adequate mechanical properties,and competitive *** molecular moieties,such as benzimidazole,benzothiazole,imide,and ether ether ketone,have been introduced to polymer chain backbones to satisfy the application requirements for *** most common sulfonated polymers based on the main chain backbones have been employed to improve the *** group/chain engineering,including the introduction of SO_(3)^(-) on the side chain,grafting,branching,and crosslinking,has been widely applied to HTPEMs to further improve their proton conductivity,thermal stability,and mechanical ***,phosphoric acid-doped polybenzimidazole is the most successful polymer material for application in *** compositing/blending modification methods of polymers are effective in obtaining high PA-doping levels and superior mechanical *** this review,the current progress of various membrane materials used for HT-PEMs is *** synthesis and performance characteristics of polymers containing specific moieties in the chain backbones applied to HT-PEMs are discussed *** modification approaches and their deficiencies associated with HT-PEMs are analyzed and *** and future challenges are also presented.

摘要：Refractory alloys such as tungsten and molybdenum based alloys with high strength,thermal/electrical conductivity,low coefficient of thermal expansion and excellent creep resistances are highly desirable for applications in nuclear facilities,critical components in aerospace and defense ***,the serious embrittlement limits the engineering usability of some refractory alloys.A lot of research results indicate that the performances of refractory alloys are closely related to the physical/chemical status,such as the interface dimension,interface type,interface composition of their grain boundaries(GBs),phase boundaries(PBs)and other interface *** paper reviewed the recent progress of simulations and experiments on interface design strategies that achieve high performance refractory *** strategies include GB interface purifying/strengthening,PB interface strengthening and PB/GB synergistic *** details are provided on the design/fabrication strategy such as GB interface controlling,PB interface controlling and synergistic control of multi-scaled *** corresponding performances such as the mechanical property,thermal conductivity,thermal load resistance,thermal stability,irradiation resistance,and oxidation resistance are reviewed in the aspect to the effect of *** addition,the relationships between these interfaces and material properties are ***,future developments and potential new research directions for refractory alloys are proposed.

摘要：本文研究了一类饱和非有理系统状态反馈镇定问题.通过线性分式表示技术,这类非有理系统可以转化为带有两个非线性回路的线性时不变(linear time-invariant,LTI)系统.假设非有理函数项分别满足局部扇形区间不等式以及局部Lipschitz条件,提出了两种基于LMI条件的镇定方法.最后,举例证明了所提出方法的有效性.

摘要：Three "double-cable" conjugated polymers with thienopyrroledione-based backbone and perylene bisimide as side units were designed as electron acceptor for polymer-polymer solar cells. The polymers show broad absorption spectra and low-lying frontier energy levels due to both aromatic backbone and side units. The new double-cable polymers can be used as electron acceptor to combine with several electron donors, in which power conversion efficiencies above 3% could be achieved.