Tactical problems involving uncertain actions

The purpose of this paper is to solve anm-silent versusn-silent duel with arbitrary accuracy functionsP andQ which are continuously differentiable in [0, 1] with positive derivatives in (0, 1) and such thatP(0)=Q(0)=0,P(1)(0, 1),Q(1)(0, 1). The game can be interpreted as a game in which the players know only that the numbers of their actions have binomial distribution.Part of this paper was written during the author's stay at the Institute of Statistics and Mathematical Economics, University of Karlsruhe, FRG. The author wishes to thank Prof. S. Trybua, Technical University of Wrocaw, Poland, for helpful discussion in preparing the paper and Prof. D. Pallaschke, University of Karlsruhe, FRG, for help in preparing the numerical example.     

色谱技术在中药指纹图谱研究中的应用

 介绍了气相色谱、高效液相色谱、超临界流体色谱和高速逆流色谱等几种色谱技术在中药指纹图谱研究中的应用现状,以及使用模糊聚类分析和人工神经网络分析指纹图谱对中药进行模式识别和质量鉴定的方法。     

基于FPGA的多通道雷达数据回放系统设计

为解决雷达实时信号处理功能及性能有效验证问题,文中设计并实现了一种宽窄带一体化、多通道雷达数据回放系统。该系统按雷达工作的时序和数据率将雷达回波数据发送至实时信号处理系统,从而对目标跟踪场景进行复现,实现雷达实时信号处理功能及性能的有效验证。系统硬件平台由磁盘阵列服务器与两块PCIe光纤板组成。基于Xilinx系列产品,结合系统特点对PCIe DMA控制流程及响应机制做进一步调整,实现了服务器到光纤板的雷达回波数据高速批量传输。根据雷达工作机制及回波数据结构,设计FPGA回放控制状态机及相关功能模块,严格按照雷达工作的时序和数据率使雷达回波数据由光纤板传输至实时处理系统。分别设计软件同步控制方法和硬件同步控制方法,保证多板卡数据回放的同步性。测试结果表明,该系统实现了宽、窄带雷达回波数据的板间同步回放,各数据类型分别支持6路并行数据通道,数据回放峰值速率可达1 920 MB·s^-1。文中系统可依托雷达原有硬件平台实现,无需增设板卡和线缆,具有良好的集成性与通用性,目前已被应用于某多功能相控阵雷达中。     

基于故障统一模型的故障检测策略

随着集成电路制造工艺持续向纳米尺度的推进,数字电路受老化、工艺误差、软错误等故障所造成的时序偏差越发突出,严重威胁了电路的“时序安全”。文中通过分析故障影响信号稳定性侵犯模型,提出了一种新的故障检测模型。该模型扩展了现有的故障检测能力,通过使用C单元作为稳定性检测器输出单元,提高了其对高速的适应性。仿真结果显示,与已有结果相比其具有明显的速度优势和较小的硬件开销。     

Polypyrrole-coated cotton fabrics prepared by electrochemical polymerization as textile counter electrode for dye-sensitized solar cells

Textile-based wearable electronics provides the combined advantages of both electronics and textiles, such as flexibility, stretchability and lightweight. Much effort has been dedicated to achieve flexible photovoltaic power for wearable electronics. Here, we have demonstrated polypyrrole (PPy) coated cotton fabrics as textile counter electrode (CE) in dye-sensitized solar cells (DSSCs). PPy is deposited on the Ni-coated cotton fabrics as catalytic material by electrochemical polymerization of pyrrole. The highly conductive PPy-coated fabric electrode with a surface resistance of 5.0 Ω sq⁻¹ shows reasonable catalytic activity for the reduction of triiodide ion. The DSSC fabricated with the PPy-coated fabric CE exhibits a power conversion efficiency as high as ∼3.83% under AM 1.5 illumination.     

一种实现时序快速有效收敛的时钟树综合方案

针对低频下数字集成电路实现时序收敛需要插入大量缓冲器而导致芯片布线困难、运行时间较长等问题,提出了一种降低时钟树级数与增加保持时间余量相结合的时钟树综合方案。基于CSMC 0.35 μm CMOS工艺,采用提出的方案,使用IC Compiler和Prime Time工具,分别完成了应用于高精度隔离型Σ-Δ ADC芯片的低速数字滤波器的物理设计以及静态时序分析。结果表明,与传统方案相比,保持时间负松弛总值降低了95.62%,时序收敛所需缓冲器个数减少了约98.13%,运行时间缩短了97.25%,有效地降低了布线拥塞程度,快速有效地实现了时序收敛。     

一种改进的早迟积分型位定时同步方法

数字通信系统中,位定时同步是实现正常数字通信的必要条件.位定时同步方法有很多,其中早迟积分型位定时方法是应用最广泛的位定时方法之一.本文基于传统的早迟积分型位定时方法,通过改进早迟积分环的鉴相器,提出了一种改进的早迟积分型位定时方法.经Matlab仿真表明,在相同的环路滤波参数下,改进的早迟积分型位定时方法的环路收敛速度最优可以提高2倍.     

一种新型压电振动输送器的设计

为了能实现对轻、薄、小物料的稳定输送,提出了一种压电双晶片为驱动源配重式直线振动输送器。设计了压电振动输送器的结构并分析了其工作原理,建立了系统的动力学模型,推导出了双自由度系统的振动位移表达式以及近似得到系统的固有频率,制作了振动输送器的样机,并进行了试验测试。试验结果表明:在系统共振频率为120.5Hz,料道振动位移达到最大,3个测试点分别为39μm,34μm,37μm,但不影响物料输送,工作频率范围为117~124Hz,处于共振频率最大输送速度达到52mm/s。与同型号的电磁式振动输送器相比,在共振条件下研制的样机的电流仅为电磁式的16.58%,速度是其1.36倍,振幅为电磁式的32.38%,噪音降低了33dB。设计的输送器具有送速度稳定、节能、噪音小等优点。     

An efficient strategy for the extraction and purification of lignans from Schisandra chinensis by a combination of supercritical fluid extraction and high‐speed counter‐current chromatography

An efficient strategy for extracting and separating five lignans from Schisandra chinensis (Turcz.) Baill has been developed using supercritical fluid extraction (SFE) and high‐speed counter‐current chromatography (HSCCC) in the present study. First, the extraction was performed by a preparative SFE system under 15 MPa of pressure at 36°C for 4 h. Then, the SFE extract was successfully separated and purified by HSCCC with a two‐phase solvent system composed of n‐hexane/ethyl acetate/methanol/water (6:4:5:5, 6:4:6:4, 6:4:8:2, v/v) in a stepwise elution mode. The fractions were analyzed by HPLC, and the chemical structures of the products were identified by ESI‐MS and ¹H NMR spectroscopy. As a result, a total of 12.5 mg of schisandrin at 98.0% purity, 7.1 mg of gomisin A at 98.1% purity, 1.8 mg of schisantherin B at 93.3% purity, 4.4 mg of deoxyschisandrin at 92.9% purity, and 6.8 mg of γ‐schisandrin at 89.1% purity were obtained from 300 mg crude extract in a one‐step purification.     

Separation of five oligostilbenes from Vitis amurensis by flow‐rate gradient high‐performance counter‐current chromatography

A rapid and efficient high‐performance counter‐current chromatography (HPCCC) method was developed to separate five oligostilbenes from the roots of Vitis amurensis. An n‐hexane/ethyl acetate/methanol/water system (4:8:4:10, v/v/v/v) was selected as an optimal two‐phase solvent system of which the upper phase was used as the stationary phase and the lower phase was used as the mobile one. Partition coefficient values for the target compounds under these optimized conditions were 0.28 ( 1 , ampleosin A), 7.12 ( 2 , (+)‐g‐viniferin), 2.26 ( 3 , vitisin A), 5.38 ( 4 , wilsonol C), and 11.23 ( 5 , vitisin B). Flow‐rate gradient HPCCC (4 mL/min in 0–70 min, 8 mL/min in 70–250 min) was applied to isolate the target compounds in as high purity as possible within the shortest possible run time. Under these conditions, ampelopsin A (12.1 mg), (+)‐g‐viniferin (10.4 mg), vitisin A (2.8 mg), wilsonol C (3.2 mg), and vitisin B (37 mg) were isolated with >95% purity from 150 mg of enriched oligostilbene extract. Although the K_D of the last eluted compound, vitisin B (K_D = 11.23), was relatively large, it was eluted in 115–145 min using the two‐phase solvent system. This study shows that HPCCC is an efficient tool for the isolation and purification of natural products.