FPGA的动力电池检测系统研究

为提高动力电池使用效率,提出了一种基于FPGA的动力电池检测系统的设计方案.采用AD转换芯片实现对电池电压、电流的采集,数字温度传感器对温度进行采集,再通过软件实现对数据的处理和实时显示.系统运行稳定,数据处理能力强,集成度高,易于扩展.     

可转债融资与公司股价长期表现实证研究

实证检验了我国上市公司可转债融资后的股价长期表现,结果发现,可转债融资后的公司股价并未如配股和增发再融资后的长期表现欠佳,而是有一定的优越表现.以EBIT与Size/BM可比公司进行调整后,一年期的累积超过收益分别为13.52%和17.13%,而以大盘指数调整后的一年期累积超额收益仅为0.41%.对以Size/BM可比公司调整后的累积超额收益给予的多元回归分析发现,可转债发行后的一年期股价市场表现与初始转换概率正相关,与股权稀释因子负相关,而在统计意义上不显著,但制造业公司在可转债发行后股价的一年期市场表现优于非制造业的公司,且在10%的水平下显著.     

CMC在珠光颜料涂布纸中的应用试验

对添加羧甲基纤维素钠改善水性珠光涂布纸云母系列珠光涂料的性质做了初步研究．试验结果表明，羧甲基纤维素钠不仅能改善涂料的稳定性，提高涂层的表面拉毛强度，还能起到辅助胶粘剂的作用．通过优化试验得到了较理想的羧甲基纤维素钠配比．     

多技术状态产品性能可靠性仿真评估方法研究

针对某产品空投试验时多状态、小样本的特点,提出了一种基于正态环境因子的性能可靠性仿真评估方法。运用仿真技术获得了环境因子的仿真结果,利用环境因子将分散在不同空投条件下的试验数据折算到某一典型工况下,得到了较客观的产品入水可靠性评估结果。     

无Y电容开关电源的EMI抑制方法研究

在要求低漏电流的电子设备中使用的开关电源不能采用Y电容,但无Y电容的开关电源往往难以通过EMC测试。文中通过分析开关电源中造成电磁干扰问题的原因和解决方法,提出利用吸收电路来抑制无Y电容情况下开关电源的电磁干扰。测试表明,这种方法可以有效解决无Y电容的开关电源中EMI问题。     

Electronic structure of polythieno[3,4-b]-thiophene-co-benzodithiophene (PTB7) derivatives for organic solar cell applications

Among the new materials currently employed as electron donor element in active layers of organic solar cells (OSCs), PTB7 holds the best results. It has been extensively studied and now there is a search for new derivatives to improve its properties. In this work, a set of 24 polymers derived from polythieno[3,4-b]-thiophene-co-benzodithiophene (PTB7) was studied theoretically, using chemical modifications in the benzodithiophene (BDT) moiety of the PTB7 monomeric units. After evaluations of the electronic and optical properties, including the open circuit voltage and exciton dissociation and recombination conditions, the results indicate that employing chlorine as substituent yields the most promising material for application in active layers together with Phenyl-C₆₁-Butyric-Acid-Methyl-Ester (PCBM) as electron acceptor material.     

Experimental Demonstration of Multipoint Temperature Warning Sensor Using a Multichannel Matched Fiber Bragg Grating

A novel time-division-multiplexing fiber Bragg grating (FBG) sensor for multipoint temperature warning sensor is proposed and demonstrated. A multiwavelength pulsed laser based on a multichannel matched FBG is employed. The sensor array consists of multiple uniform FBGs at different positions and with different nominal wavelengths. When the temperature exceeds the threshold at a certain position, the light at the corresponding time slot and wavelength can be detected. The sensor provides a simple and flexible solution to locate the abnormal temperature increase with different tolerable thresholds at different locations.     

A Coded Modulation Scheme for Deep-Space Optical Communications

A coded modulation scheme for deep-space optical communications is studied, which is a serial concatenation of an outer low-density parity-check (LDPC) code, an interleaver, a bit-accumulator, and pulse-position modulation (PPM). It is referred as LDPC-APPM. It is decoded with an iterative demodulator-decoder using standard turbo-decoding techniques. Simulation results show that the LDPC-APPM with an outer LDPC code of medium code length suffers a loss of about 0.7 dB at a bit-error rate of relative to the serially concatenated PPM (SCPPM) of similar parameters, which consists of the serial concatenation of an outer convolutional code, an interleaver, a bit-accumulator, and PPM; however, it has better code rate flexibility especially for high rates and simpler implementation structure than SCPPM. Further, it can achieve better performance than the LDPC-PPM of the same rate and length, which consists of the serial concatenation of an LDPC code and PPM.     

3σ-rule-based early termination algorithm for mode decision in H.264

A low-complexity early termination algorithm for mode decision in H.264 is presented. The proposed algorithm is based on the statistical distribution of per-pixel motion cost, and it can skip the mode decision of the candidate macroblock modes with low probability. Simulation results reveal that the proposed algorithm can reduce the encoding time by 16.25% on average with the limited performance loss of about 0.023% dB.     

应用网络编码的分组交换调度算法

网络编码理论与交换调度算法相结合重点是实现在联合输入输出排队（CIOQ）交换结构中提供组播服务。文章证明了对一个流中的分组进行线性网络编码可以承载不允许网络编码时不能够承载的交换流量模式,也就是说,网络编码允许CIOQ交换结构在实现组播服务时有更大的速率区域,并给出了基于图论方法的描述。运用增强冲突图的稳定集多面体等概念,文章证明了计算离线调度的问题可以简化成某种图染色问题,同时,也针对组播调度提出了一个称之为最大权重稳定集的在线调度算法。