摘要：Some key technologies of actualizing customer relationship management(CrM)systems are *** customer analysis mining prototype systems on the basis of on-line analytical mining(OLAM)is *** transaction analysis,the data warehouse of CrM is *** CLV/CL/CC customer division model based on customer lifetime value,customer loyalty and customer credit is emphatically *** parameters of customer division—customer lifetime value,customer loyalty and customer credit—are calculated by corresponding algorithms,which can realize customer divisions effectively and improve the accuracy of distinguishing among *** data of product sales are analyzed by the sequence association rules algorithm,the potential rules of the products relevance are discovered,which can provide evidence for supporting decisions such as promotion *** transaction data such as product sales volumes and order lists are analyzed on-line through multi-dimensional and multi-level up-drills,down-drills,and horizontal/longitudinal *** customer property factors are analyzed as *** theory and practice of OLAM and its visualization are further explored.

摘要：生物质是世界上广泛存在的可再生资源,可以转化成高价值燃料和化学品.基于可再生能源产生的电力,将生物质衍生的5-羟甲基糠醛(HMF)电催化转化为2,5-呋喃二甲醇(BHMF)具有重要的研究意义和应用价值.HMF在电转化过程中容易发生二聚反应,从而导致BHMF的选择性较低,产物分离难度大.因此,探索获得高选择性BHMF的高效催化体系极为重要.在此,本文报道了rh掺杂的Cu纳米线催化剂,其在HMF电还原为BHMF反应中表现出较高的转化率,且有效抑制了二聚反应的发生.动力学实验和原位光谱研究表明,rh的引入可以有效促进水解离形成活性氢物种,促进5-羟甲基糠醛电催化加氢并抑制其二聚.此催化剂设计策略可以拓展到其他生物质衍生分子的电催化转化过程中.

摘要：The chemical structure of covalent organic frameworks(COFs)plays a key role in their response to the surface doping strategy used for tuning their electronic character,but it is still not fully *** explore a rational design proposal for their chemical structure,the electronic properties of three n-doped typical COFs,including boroncontaining(COF-1),triazine-based(CTF),and C–C bondlinked(GCOF)COFs,were investigated theoretically in this *** expected,the chemical doping effects are different for these *** dispersion of the frontier bands,the nuclear-independent chemical shift(NICS)aromaticity index results,distribution of the electron localization function(ELF),and Hirshfeld charge population plots show that part of the transferred electron from dopants will be offset by the intralayer charge transfer of ***,chemical doping effects are more significant if the electron distribution in the COFs is more *** means the response of COFs to the surface doping strategy should be dominated by the conjugation degree of their chemical *** results prove that the intrinsic conjugation degree of COFs plays a key role in such doping functionalization strategies,which are expected to provide more useful information for the initial structure design of COF materials and facilitate their practical applications as active electronic transport materials in nanoscale devices.

摘要：In order to increase the hardware utilization and minimize the chip area a multi-transform coding architecture which includes 4 ×4 forward integer transform 4 ×4 inverse integer transform 4 ×4 Hadamard transform and 2 ×2 Hadamard transform is proposed. By simplifying these transforms and exploring their similarities the proposed design merges the architectures processing individual transforms into a high-performance multi-transform coding *** a semiconductor manufacturing international corporation SMIC 0.18 μm complementary metal oxide semiconductor CMOS technology the proposed architecture achieves the maximum operating clock frequency of 200 MHz and the throughput rate of 800 ×106 pixel/s with the hardware cost of 3 704 *** results demonstrate that the data throughput rate per unit area dTUA of this design is at least 40.28%higher than that of the reference *** design can meet the requirements of real-time decoding digital cinema video 4 096 ×2 048@30 Hz at 62.9 MHz which helps to reduce the power consumption.

摘要：3μm波段中红外激光处于大气传输窗口,又可以作为基础光源,是激光技术研究的前沿。目前,铒离子激活的激光晶体材料是产生3μm中红外激光的重要途径之一。然而,Er3+离子4I11/2激光上能级荧光寿命较短,下能级4I13/2的寿命较长,难以实现粒子数反转,导致自终止现象。为了解决这一难题,往往需要高浓度掺杂,通过能量传递降低4I13/2能级的寿命。然而高浓度掺杂又会造成晶体热性能变差,限制了掺Er3+激光晶体效率和功率。三阶铒离子容易在氟化物晶体中形成团簇,导致稀土离子间距缩短,即使在低掺杂浓度下稀土离子之间的能量传递作用仍较为显著。同时,低浓度掺杂还可以减轻激光运转下晶体的热堆积效应。掺铒氟化物晶体已成为一类重要的高功率、高效率中红外激光材料。然而,掺铒氟化物晶体的光谱性能与铒离子团簇结构之间的相互联系尚不明确,制约了掺铒氟化物晶体光谱和激光性能的进一步发展。本文采用第一性原理计算模拟了铒离子在CaF_(2)、SrF_(2)和PbF_(2)晶体中的团簇结构。结果显示,铒离子团簇结构随基质晶体变化逐渐演变。结合模拟计算和实验表征定性揭示了不同晶体离子团簇与光谱性能的联系,为掺铒氟化物中红外激光晶体材料的调控与设计提供参考。

摘要：光谱偏振成像技术是一种新型的光学成像技术,它不仅提高了目标的信息获取量,还降低了背景噪声,可以捕获目标细节,检测伪装目标。本文提出了一种将亚波长光栅与F-P滤光片相结合的光谱偏振测量器件,该器件可以获得超高光谱分辨率和偏振消光比,并且光谱和偏振可以灵活调控。本文设计了一种光谱偏振同时分光器,可同时获得4个光谱通道的斯托克斯参数。仿真结果表明,其光谱分辨率为217,偏振消光比为106。实验结果表明,亚波长光栅的偏振消光比大于500,透射率为90%。全介质F-P滤光片的光谱分辨率为30,在长波红外波段的透射率为60%。该设计方法具有通用性,可用于可见光、红外甚至太赫兹等波段。得益于这些优点,器件在微型偏振光谱仪和全斯托克斯偏振检测等领域有很大的应用潜力。

摘要：设计并实现了一套由热释电传感器和编码的菲涅尔透镜组成的生物特征跟踪识别系统。对传感器得到的生物信号采用了2种方法提取特征:一种是时域方法,即通过Ar模型提取自回归系数;另一种是频域方法,即通过主成分分析后的傅里叶变换提取频谱信息。最后采用支持向量机的方法分别验证了2种特征的识别性能。16名受试者在3种行走速度实验环境下的初步结果显示,时域特征的正确识别率为66.48%,而频域特征的识别率则达到了86.5%。上述结果表明了热释电信息用于人体身份识别的潜能,并证明了个体差异与步态频率信息的强相关性。

摘要：Modern medicine is increasingly interested in advanced sensors to detect and analyze biochemical *** sensors based on potentiometric methods are a promising platform for monitoring physiological ions in biological *** semi-implantable devices are mainly based on single-parameter *** semi-implantable electrodes for multiparameter sensing have more restrictions on the electrode size due to biocompatibility considerations,but reducing the electrode surface area could potentially limit electrode *** study developed a semi-implantable device system comprising a multiplexed microfilament electrode cluster(MMEC)and a printed circuit board for real-time monitoring of intra-tissue K^(+),Ca^(2+),and Na^(+)*** electrode surface area was less important for the potentiometric sensing mechanism,suggesting the feasibility of using a tiny fiber-like electrode for potentiometric *** MMEC device exhibited a broad linear response(K^(+):2–32 mmol/L;Ca^(2+):0.5–4 mmol/L;Na^(+):10–160 mmol/L),high sensitivity(about 20–45 mV/decade),temporal stability(>2weeks),and good selectivity(>80%)for the above *** vitro detection and in vivo subcutaneous and brain experiment results showed that the MMEC system exhibits good multi-ion monitoring performance in several complex *** work provides a platform for the continuous real-time monitoring of ion fluctuations in different situations and has implications for developing smart sensors to monitor human health.

摘要：Kinetics of Co（II） extraction from sulfate aqueous solution by the sodium salt of di-decylphosphinic acid （Na-ddPA） was studied using a modified Lewis cell to disclose the mechanism of extraction. Parameters affecting the extraction rate, such as stirring speed, temperature, interfacial area, Na-ddPA concentration and Co（II） concentration, were investigated, respectively. The effect of diffusion resistance on extraction rate was negligible when the stirring operation was conducted in a plateau region of 95-110 r/min. Extraction rate increased with the increase in the temperature or specific interfacial area. The activation energy E was calculated to be 32.75 kJ/mol. These suggested that rate controlling mechanism of Co（II） extraction by Na-ddPA was chemical reaction regime and the rate-determining step of Co（II） extraction was chemical reaction at the interface. The initial extraction rate also increased with the increase in the concentrations of Na-ddPA and Co（II）. The extraction rate equation and mechanism of Co（II） extraction by Na-ddPA were proposed.

摘要：在建设大规模的视频监控网络时,面对监控终端随时传输过来的动态数据流问题,提出一种动态的数据量预测方法和优化设计方案.通过对系统均衡状态的理论分析,建立多层排队网络模型用以分析和预测视频监控网络的视频动态上传行为.基于此模型,对监控网络建设中的两个资源配置问题提出了优化方案.针对满足需求的最少资源配置问题,通过建模给出一种量化计算方法.对因突发事件随机暴增的上传数据流,设计了一种动态调整计算量的算法,可将超出负荷的数据流动态转移到其他可用的计算点,以保持整个系统的负载均衡,保证有效的响应时间.最后,通过一组实际环境下的实验验证了该分析和算法的有效性.