全自动人民币伪币鉴别仪的设计

设计一款全自动的伪钞鉴别仪系统.该系统具备磁感、红外、紫外等多种探测功能,不仅能对票面的防伪特性分布进行定量化分析,还能对纸币面值自动识别.     

Research of Frequency Discriminator on Frequency Lock Loops

Frequency lock loops (FLL) discriminating algorithms for direct-sequence spread-spectrum are discussed. The existing algorithms can't solve the problem of data bit reversal during one pre-detection integral period. And when the initial frequency offset is large,the frequency discriminator can't work normally. To solve these problems,a new FLL discriminating algorithm is introduced. The least-squares discriminator is used in this new algorithm. As the least-squares discriminator has a short process unit period,the corresponding frequency discriminating range is large. And the data bit reversal just influence one process unit period,so the least-squares discriminated result will not be affected. Compared with traditional frequency discriminator,the least-squares algorithm can effectively solve the problem of data bit reversal and can endure larger initial frequency offset.     

构建多Agent模型研究差别电价对行业的影响

运用基于Agent模拟的建模方法构建研究差别电价影响效果的多Agent模型,设计由政府Agent、电力Agent及行业Agent组成的多Agent框架,分析Agent的目标及行为策略,设计系统的仿真流程。以高耗能行业实施差别电价为例,模拟对化学工业、建筑材料业、金属冶炼业实施差别电价对我国物价水平及电力消费所造成的影响。研究结果表明：所构建的多Agent模型突破了传统数学模型考虑因素不足的缺点,充分考虑了经济系统中个体自身的目标以及与周围环境的相互作用等因素,更好地反映了微观个体与宏观经济之间的联系：对高耗能行业实施差别电价不但不会使物价明显上涨,而且具有较好的节电效果。     

光纤Bragg光栅应变、温度区分测量方法研究

分析了光纤Bragg光栅应变和温度交叉敏感的物理机制,将目前存在的多种解决方案归纳为三类,即:矩阵运算法、参考FBG法、采用两个包层直径不同的FBG法,并全面介绍了各种解决方案的原理及优缺点。     

Enhanced response speed of SAW based hydrogen sensor employing a micro-heater

To feature fast hydrogen detection, a new design of surface acoustic wave (SAW) based hydrogen sensor integrated with a micro-heater is proposed in this paper. A 200 MHz delay-line patterned SAW sensing chip coated Pd/Ni alloy hydrogen sensitive film and a micro-heater are prepared on a Y35^oX quartz wafer. The hydrogen gas adsorption in Pd/Ni thin-film modulates the SAW propagation, and against the temperature interference, the corresponding changes in acoustic attenuation are collected as the sensor signal. The Micro-heater is designed to catalysis the gas-sensitive effect by regulating the working temperature, and the influence law of heating temperature towards response speed is revealed theoretically, allowing determination of the optimal working temperature. The experimental results verify the theoretical prediction. Fast response (t₉₀ < 2 s), lower power consumption (<1.35 W), and the low detection limit (<15 ppm) are achieved at low working temperature of 75 °C. Furthermore, very low crossed humidity sensitivity and excellent long-term stability are observed.     

Effects of text/background color combination,ambient illuminance,and display type on discriminating performance for young and elderly users

Abstract— This study examined the effects of text/background color combinations (black‐on‐white, red‐on‐white, green‐on‐white, and blue‐on‐white), ambient illuminance (50, 500, and 12,000 lx), and display type (color electronic‐paper displays and conventional transmissive liquid‐crystal displays) on the discriminating performance of young and elderly users. The results showed that when participants used the color e‐paper display, young participants had significantly better discriminating performance than elderly participants under the text/background color combinations of black‐on‐white, green‐on‐white, and blue‐on‐white, whereas no significant difference was present between young and elderly participants under red‐on‐white. When participants used a conventional transmissive LCD, however, there was no significant difference between young and elderly participants under all text/background color‐combination settings. Young participants had substantially better discriminating performance under 500 and 12,000 lx than under 50 lx, whereas elderly participants had the best discriminating performance under 12,000 lx, followed by that under 500 lx, and the worst performance under 50 lx. Participants who used a conventional transmissive LCD had substantially better discriminating performance under 500 and 12,000 lx than under 50 lx. Participants who used the color e‐paper display had the best discriminating performance under 12,000 lx, followed by that under 500 lx, and the worst performance under 50 lx. The results can be the guild for the designers of color e‐paper displays.     

陆西凹陷九佛堂组储层孔隙度解释方法研究

以开鲁盆地陆家堡坳陷中的陆西凹陷的岩心分析和测井资料为基础，建立起测井解释模型；给出孔隙度计算方法和方程；建立起油、气、水与孔隙度、电阻率之间的关系；给出低孔隙度储层的解释方法。并对开鲁盆地陆家堡坳陷的１２６口井进行了解释，符合率高达８８％以上，探井符合率为７８％，取得了令人满意的结果。为低孔隙度储层油气的勘探、开发提供了可靠的测井解释依据。     

一种改进的文本分类特征选择算法

现有的一种特征选择算法DPM（Discriminating Power Measure）[1],是通过计算每个特征在某一类别和剩余其他类别中的文档频,比较了特征对一个类别和对其他类别的贡献,提取出具有强类别区分能力的特征词.在研究此特征选择算法的基础上,提出了一种改进的特征选择算法,该算法同时考虑了每个特征的类别频次在计算特征类别区分能力方面的重要性.经实验验证,改进后的特征选择算法能够获得较好的分类效果.     

HARSHAW6600系统剂量计算方法分析

HARSHAW6600系统是国内目前应用较广泛的一种热释光剂量测量系统,该系统内部设置了一系列参数用于剂量数据的计算并确保计算的准确性。本文介绍这些参数意义,分析剂量计算的原理,验证计算的准确性,给出低能射线照射时剂量的计算建议。     

光纤光栅温度压力同时区分测量技术研究

提出一种基于金属合金薄壁弹性圆筒双光纤Bragg光栅(FBG)温度压力同时区分测量的传感模型。将FBG1和FBG2分别沿着圆筒的轴线方向粘贴在空心段外壁上和底座实心的外壁面上。圆筒内压力和温度的变化将引起FBG1波长的变化,温度的变化引起FBG2波长的变化,通过FBG2对FBG1的温度补偿进行温度和压力的同时区分测量。在100℃内2、0 MPa压力下,实验测得传感器的压力响应灵敏度系数约为0.012 nm/MPa,温度响应灵敏度系数约为0.012 nm/℃。