摘要：盘形滚刀地质适应性设计是隧道掘进机(TBM)刀盘设计的重要环节,直接影响TBM的整体掘进效率。滚刀匹配设计的关键是通过滚刀性能评价选择适宜的滚刀尺寸。本文提出一种基于多准则决策的新型评价方法用以确定滚刀尺寸,以不同型号滚刀为设计对象,建立滚刀性能评价递阶层次模型,采用层次分析和物元理论计算滚刀性能指标权重值,并通过模糊综合评价法和模糊TOPSIS决策法对不同型号滚刀性能进行综合评判与决策。将滚刀地质适应性设计方法应用于某水利工程TBM刀盘正面滚刀设计,结果表明该方法有效可靠,可为刀盘设计过程中滚刀性能评价和匹配设计提供一定理论依据。

摘要：提出了一种改进型螺旋微带谐振单元(SCMRC)的结构.该改进型螺旋微带谐振单元具有微带并联开路线,在低频通带内通过设计达到50Ω的端口阻抗.同时,并联的微带开路线在SCMRC结构的禁带中谐振,来实现更强的慢波效应和更宽的禁带.实际设计、制作和测试了该改进型螺旋微带谐振单元,该滤波器在低频通带内具有低插入损耗、改善的回波损耗,以及在较小面积下的宽禁带.

摘要：The variance-dependent Goldstein radar interferogram filter takes into account the information of both interferometric coherence and multilook factors,and can produce very consistent results for interferograms generated under a wide variety of multilook factors and with very different noise ***,the filter is a bit complicated and its application is still very *** present the designing and implementation of the variance-dependent Goldstein radar interferogram filtering,emphasizing on the logic flow,the generation of look-up table,the determination of filtering parameter,and the handling of edge information *** with real interferograms are provided to demonstrate the applications of the designed *** with the result of the coherence-dependent Goldstein filter show that improvements from 18.4% to 36.9% are achieved when the variance-dependent filter is used,and the noisier the interferogram,the greater the improvement.

摘要：The molecular structures of metal precursors in the impregnating solution were designed so as to prepare efficient Ni Mo/Al_2O_3 hydrodesulfurization(HDS) catalysts. At first, five typical impregnating solutions were designed; the existing metal precursors, such as [Mo4(citrate)2O11]^(4-)-like, [P2Mo18O62]^(6-)-like and [P2Mo5O23]^(6-)-like species in the solutions were confirmed by laser Raman spectroscopy(LRS). The UV-Vis spectra results indicated that the solutions containing both phosphoric acid and citric acid could change the existing form of nickel species. Five corresponding Ni Mo/Al_2O_3 catalysts were prepared by the incipient wetness impregnation method. The LRS analysis results of dried catalysts showed that the above metal precursors could be partly retained on alumina support after impregnation and drying, although the interface reaction between different metal precursors and alumina support unavoidably took place. Then the catalysts were sulfided and characterized by N2 physisorption, TEM and XPS analyses. The results showed that different metal precursors in impregnating solution could mainly result in the difference in both the morphology of(Ni)Mo S2 slabs and the promoting effect of Ni species. The catalyst prepared mainly with [P2Mo5O23]^(6-)-like species used as precursors exhibited worse dispersion of(Ni)Mo S2 slabs and lower ratio of Ni–Mo–S active phases than the one with [Mo4(citrate)2O11]^(4-)-like species. Promisingly, the catalyst prepared with co-existing [Mo4(citrate)2O11]^(4-)-like, [P2Mo18O62]^(6-)-like and [P2Mo5O23]^(6-)-like species showed better hydrodesulfurization activity for 4,6-DMDBT thanks to its more well-dispersed Ni–Mo–S active phases.

摘要：We have provided optical simulations of the evanescently coupled waveguide photodiodes integrated with a 13- channels AWGs. The photodiode could exhibit high internal efficiency by appropriate choice of layers geometry and refrac- tive index. Aseamless joint structure has been designed and fabricated for integrating the output waveguides of AWGs with the evanescently coupled waveguide photodiode array. The highest simulation quantum efficiency could achieve 92% when the matching layer thickfiess of the PD is 120 nm and the insertion length is 2 μm. The fabricated PD with 320-nm-thick *** layer and 2-μm-length insertion matching layer present a responsivity of 0.87 A/W.

摘要：The solar spectrum covers a broad wavelength range, which requires that antireflection coating （ARC） is effective over a relatively wide wavelength range for more incident light coming into the cell. In this paper, we present two methods to measure the composite reflection of SiO2/ZnS double-layer ARC in the wavelength ranges of 300-870 nm （duaI- junction） and 300-1850 nm （triple-junction）, under the solar spectrum AM0. In order to give sufficient consideration to the ARC coupled with the window layer and the dispersion effect of the refractive index of each layer, we use multidimensional matrix data for reliable simulation. A comparison between the results obtained from the weighted-average reflectance （WAR） method commonly used and that from the effective-average reflectance （EAR） method introduced here shows that the optimized ARC through minimizing the effective-average reflectance is convenient and available.

摘要：In this study,a 3D virtual reality and visualization engine for rendering the ocean,named VV-Ocean,is designed for marine *** design goals of VV-Ocean aim at high fidelity simulation of ocean environment,visualization of massive and multidimensional marine data,and imitation of marine ***-Ocean is composed of five modules,*** management module,resources management module,scene management module,rendering process management module and interaction management *** are three core functions in VV-Ocean:reconstructing vivid virtual ocean scenes,visualizing real data dynamically in real time,imitating and simulating marine lives *** on VV-Ocean,we establish a sea-land integration platform which can reproduce drifting and diffusion processes of oil spilling from sea bottom to *** factors such as ocean current and wind field have been considered in this *** this platform oil spilling process can be abstracted as movements of abundant oil *** result shows that oil particles blend with water well and the platform meets the requirement for real-time and interactive ***-Ocean can be widely used in ocean applications such as demonstrating marine operations,facilitating maritime communications,developing ocean games,reducing marine hazards,forecasting the weather over oceans,serving marine tourism,and so ***,further technological improvements of VV-Ocean are discussed.

摘要：As one of the key characteristics in cognitive wireless networks(CWNs),network environment awareness techniques have received much attention *** of traditional spectrum sensing technology that suffers from problems of miss detection,false alarm,hidden node,and inefficiency,cognitive pilot channel(CPC) technology has been proposed as one of the candidate solutions for an efficient and accurate network information delivery scheme to user equipment(UE).The aim of the CPC technology is to provide the necessary information for the reconfiguration of the UE using the public signaling *** ensure the efficient information delivery,the whole geographical area covered by the CPC is divided into square meshes of the same ***,two typical network information transmission modes for CPC deployment are also proposed:broadcast CPC mode and on-demand CPC *** further improve the efficiency of network information delivery,an efficient dynamic mesh grouping scheme has been designed which is based on the fractal theory for the broadcast CPC mode,where adaptive rectangular sized meshes are used to approximately cover the whole *** to the traditional fixed size mesh division strategy,results show that the proposed dynamic mesh grouping scheme significantly reduces the number of meshes by grouping similar meshes together,and the average delay of receiving CPC information on the UE side is therefore reduced.

摘要：流感病毒和新型冠状病毒(SARS-CoV-2)是近年来频繁引发呼吸道疾病的主要病原,其引起的黏膜免疫应答对于病毒的控制和清除至关重要.目前对于SARS-CoV-2感染后肺部黏膜免疫应答的具体调控机制及其与流感感染的区别尚不清楚我们通过原位杂交-多重免疫荧光染色技术及空间转录组学揭示了流感病毒和SARS-CoV-2感染过程中局部免疫应答的动态变化过程,并发现相比于流感病毒感染,SARS-CoV-2感染早期肺部黏膜会更加快速地形成诱导性支气管相关淋巴组织(iBALT)结构并活化B1细胞产生较高水平IgM和IgA,可能在抗病毒感染及iBALT的形成中发挥重要作用.同时,SARS-CoV-2及表达其S蛋白的假病毒感染均能够促进小鼠和人的B1细胞的活化.将表达S蛋白的腺病毒疫苗AdC7-S对小鼠进行免疫后,可以成功诱导出包含B1细胞的iBALT,并在病毒感染中发挥保护作用.本研究揭示了呼吸道病毒引起的肺脏黏膜免疫动态应答过程,并阐明了SARS-CoV-2感染早期B1细胞的活化特点及免疫保护作用,为揭示新发呼吸道传染病的保护性应答机制及疫苗设计提供了理论基础.

摘要：未来活动通讯系统瞄准提供很高的数据传播率，甚至在象高速度的车轮轨道火车，磁悬浮火车火车，高速公路车辆，飞机，指导导弹或太空船那样的高活动性的情形。一个特别地重要的商业应用程序是对高速度的宽带的强壮、增加的世界范围的要求无线通讯(多达 574.8 ? km/h 测试速度或 380 ? km/h 广告速度)为象为旅客的机载的娱乐服务那样的应用程序在铁路，提供的数据，声音和录像满足，火车控制，训练派遣，火车传感器地位处理和监视。在如此的高活动性的情形，有很多通讯挑战，包括快移交，更新的地点，当模特儿的高速度的隧道，评价和均等， anti-Doppler 传播技术，快力量控制，和奉献网络建筑学。因为在很高速度的情形的信号传播将不可避免地经历 s ……