盾构隧道施工引起铁路路基沉降槽宽度系数计算方法

盾构隧道施工不可避免地对隧道周围地层产生扰动,从而产生地层损失和路基沉降,路基沉降分析是盾构隧道的一个重要方面。基于Peck公式,逐步推导出单洞盾构隧道下穿铁路轨道路基沉降槽宽度系数的计算公式,从而对Peck公式进行修正,并结合福州地铁一号线的监测数据进一步验证了修正后的Peck公式的合理性和适用性。     

一种模拟电梯运行辅助教学装置的设计

本文设计了一种以单片机为核心的模拟电梯实际运行过程的装置来辅助单片机课堂教学,通过该装置可以帮助学生很好地理解如何用单片机来控制电梯运行的整个过程,以及如何设计整个单片机的程序结构,取得了良好的教学效果。     

Active digital spoof plasmonics

Digital coding and digital modulation are the foundation of modern information science. The combination of digital technology with metamaterials provides a powerful scheme for spatial and temporal controls of electromagnetic waves. Such a technique, however, has thus far been limited to the control of free-space light. Its application to plasmonics to shape subwavelength fields still remains elusive. Here, we report the design and experimental realization of a tunable conformal plasmonic metasurface, which is capable of digitally coding and modulating designer surface plasmons at the deep-subwavelength scale. Based on dynamical switching between two discrete dispersion states in a controlled manner, we achieve digital modulations of both amplitude and phase of surface waves with nearly 100% modulation depth on a single device. Our study not only introduces a new approach for active dispersion engineering, but also constitutes an important step towards the realization of subwavelength integrated plasmonic circuits.     

体育产业的关联效应与产业特性研究

基于产业经济学和数量经济学的方法，以浙江省体育产业统计调查为依据，运用投入产出模型，从产业部门间的静态关联、动态关联和交叉关联分析，揭示了体育产业对国民经济其他部门的关联广度、关联深度、影响力度和感应程度。结果显示：体育产业与16个产业部门存在较紧密联系．关联广度在诸多产业部门中居前位；与体育产业具有强关联的产业部门为纺织服装及文教用品制造业等5个部门；体育产业对经济拉动的影响力度和综合感应程度均大于全社会平均水平，并均呈现逐年升高态势，表明体育产业的需求压力在逐步提升；影响力系数和感应度系数都大于1的产业部门是体育产业升级和培育新的经济增长点的重点。根据体育产业的性态分析，认为体育产业是“动力产业”，具有5个比较鲜明的产业特性。     

In situ phase transitional polymeric vaccines for improved immunotherapy

Cancer vaccines have exhibited immense potential in cancer treatment. Through activating the host''s immune system, vaccines stimulate extensive functional T cells to eliminate cancer. However, the therapeutic efficacy of cancer vaccines is limited by their inferior lymph node delivery and inadequate uptake of dendritic cells. Herein, we propose an in situ phase transitional strategy on vaccine manufacturing to maximally enhance lymph node drainage while ensuring adequate dendritic cell uptake. The phase transitional vaccines, with dynamic size modulation property, retain a small size (24.4 ± 3.1 nm) during lymph node draining then transform into larger particles (483.0 ± 41.6 nm) on-site by external signal input. Results show that this strategy induced rapid and robust immune response in a mouse melanoma tumor model. Furthermore, a stronger humoral immune response was observed in mice when immunized with MHC-II restricted antigen, which demonstrated that lymph node-targeted cancer vaccine delivery could be effectively manipulated through dynamic size modulation.     

PJ3000M调频广播发射机技术特点及故障分析

对PJ3000M调频广播发射机的各单元电路原理及技术特点进行了全面论述,对设备在运行过程中的典型故障进行了分析,提出了故障排除过程中应采取的处理程序。     

回报计划感知价值对客户保持的影响实证研究

本文以超市零售业为背景,以回报计划感知收益和感知成本为前因,回报计划感知价值为中介,建立了研究模型,并检验了其对客户保持维度(关系长度、关系深度、关系宽度)的影响.结果表明:客户参加回报计划的感知收益正向影响回报计划感知价值,感知成本负向影响回报计划感知价值;回报计划感知价值对客户保持中关系长度和关系深度呈显著的正影响关系;并且关系深度正向影响关系长度和关系宽度.研究说明,回报计划是有效的促进客户保持的关系营销策略.     

Hybrid method for global optimization using more accuracy interval computation

In this paper,a novel hybrid method is presented for finding global optimization of an objective function.Based on the interval computation,this hybrid method combines interval deterministic method and stochastic evolution method.It can find global optimization quickly while ensuring the deterministic and stability of the algorithm.When using interval computation,extra width constraints accuracy of interval computation results.In this paper,a splitting method to reduce the extra width is introduced.This met...     

Surface pattern based on an azobenzene-containing copolymer thin film and its light-driven morphology modulation

A type of azobenzene-containing block copolymer polymethyl methacrylate-b-poly (n-butylmethacrylate-co-6-(4-(phenylazo) benzoate) hexyl methacrylate) (PMMA-b-(PnBMA-co-PAzoMA)) was synthesized by the atom transfer radical polymerization (ATRP). Macroinitiator polymethyl methacrylate (PMMA) was prepared by ATRP and used to initiate the copolymerization of monomer n-butyl methacrylate (nBMA) and azobenzene-based methacrylate monomer (AzoMA). Herein, three block copolymers with different molecular weights and block volume fractions were obtained and spin-coated on a silicon substrate or quartz plate before annealing at 180 °C for 14 h. The surface morphologies in these annealed copolymer films were observed by atomic force microscopy (AFM). Bicontinuous stripe or island patterns with different sizes were formed dependent on the film thickness. These ordered patterns are considered to be formed arising from the dewetting process of the surface layer in the copolymer film. Photoisomerization of azobenzene units in the copolymer films changed the dewetting behaviors of the surface layer of the thin film. Therefore, some copolymer annealed films showed a reversible morphology conversion between bicontinuous stripe and island structure when exposed to UV light and upon being stored in the dark. It was found that the composition of the block copolymer had obvious influences on the photoinduced morphology conversion behaviors in these copolymer thin films. When the volumes of PnBMA and PAzoMA phases in the block copolymer were large enough, the surface morphology could be modulated by UV light irradiation and storage in the dark. This work proposes a new possibility for photoinduced control and design of the dewetting processes of thin films using a linear block copolymer.     

A Case Study of Edwin Howard Armstrong's Public Relations Campaign for Frequency Modulation

Edwin Howard Armstrong is commonly remembered as the inventor of frequency modulation (FM). There are those, however, who dispute this claim and assert that Armstrong's legacy is a work of fiction rather than history. This study examines the extensive public relations campaign on behalf of both FM and Armstrong from 1940 until after his death. This thesis is a case study of this campaign for the purpose of understanding the narrative presented to the American public.