基于Agent技术的ERTU软件设计

介绍了Agent的概念、特点、面向Agent的软件设计思想,分析了电能量计量计费系统中ERTU的功能特点,给出了采用Agent技术的ERTU(电能量数据采集终端器)的软件结构,指出Agent技术在ERTU中的应用符合系统开放性、模块化、智能化、人性化的发展方向,最后还比较了运用Agent技术的优缺点。     

基于Counting Bloom Filter的海量网页快速去重研究

随着网络技术和电力信息化业务的不断发展,网络信息越发膨胀,将导致互联网和电力信息网中存在海量网页冗余的现象,这类现象将会使数据挖掘、快速检索的复杂度加大,从而对网络设备和存储设备的性能带来了巨大的挑战,因此研究海量网页快速去重是非常有必要的。网页去重是从给定的大量的数据集合中检测出冗余的网页,然后将冗余的网页从该数据集合中去除的过程,其中基于同源网页的URL去重的研究已经取得了很大的发,但是针对海量网页去重问题,目前还没有很好的解决方案,本文在基于MD5指纹库网页去重算法的基础上,结合Counting Bloom filter算法的特性,提出了一种快速去重算法IMP-CMFilter。该算法通过减少I/0频繁操作,来提高海量网页去重的效率。实验表明,IMP-CMFilter算法的有效性。     

基于聚偏二氟乙烯步态智能检测的乘客计数系统

针对现有的以低成本、耐损耗的聚偏二氟乙烯(PVDF)为压电材料的客流计数传感器存在的误计数、漏计数而导致精度不够的问题,提出了一种基于PVDF步态智能检测技术的乘客计数系统。采用ANSYS软件对乘客上下车步态作应力分析,观察PVDF压电信号的分布规律,设计多输入信号调理电路获取多通道足底信号,结合信号处理算法,设计了传感器机械结构和基于实验室虚拟仪器集成环境(LabVIEW)的公交车人数统计系统。实验结果表明,该系统平均计数误差为5.3%,与已有的PVDF客流计数传感器相比,提高了精度;与视频图像计数和人体红外检测技术相比,大大降低了成本,具有很高的实用性,可以广泛应用于我国公共交通客运车。     

Development of an energy-binned photon-counting detector for X-ray and gamma-ray imaging

The aim of this study is to develop an energy-binned photon-counting (EBPC) detector that enables us to provide energy information of x-rays with a reasonable count statistics. We used Al-pixel/CdTe/Pt semiconductor detectors, which had an active area of 8 mm×144 mm and consisted of 18 modules aligned linearly. The size of a CdTe detector module was 8 mm×8 mm and the thickness of the CdTe crystal was 1 mm. Each module consisted of 40×40 pixels and the pixel size was 200 μm×200 μm. We applied the bias voltage of −500 V to the Pt common electrode. The detector counted the number of x-ray photons with four different energy windows, and output four energy-binned images with pixel depths of 12, 12, 11 and 10 bits at a frame rate of 1200 Hz (300 Hz×4 energy bins). The basic performance of the detector was evaluated in several experiments. The results showed that the detector realized the photon counting rate of 0.4×10⁶ counts/sec/pixel (10⁷ counts/sec/mm²), energy resolution 4.4% FWHM at 122 keV. The integral uniformity of the detector was about 1% and the differential uniformity was about 1%. In addition, the image quality was examined with a resolution chart and step-wedge phantoms made of aluminum and polymethyl methacrylate. And we compared the quality of an acquired image with that acquired with an energy integration detector. The results of these experiments showed that the developed detector had desirable intrinsic characteristics for x-ray photon counting imaging.     

Performance evaluation of three optical particle counters with an efficient “multimodal” calibration method

The sizing accuracies of two widely used yet hitherto unevaluated optical particle counters (OPCs—Grimm Model 1.109 and Palas Model WELAS 2100) as well as one high-resolution, non-commercial OPC were evaluated. The measured data were compared to scattering intensity calculations based on Mie theory. Additionally, the counting efficiency for all three counters was measured, as was the influence of coincidence effects for the OPC with the lowest (manufacturer specified) upper concentration limit.Beside the traditional polystyrene latex calibration, a little-known, very fast and precise “multimodal” calibration method was used, which is based on the simultaneous generation of up to eight sharp multiple-charge modes from polydisperse di-ethyl-hexyl-sebacate (DEHS) particles by electrical mobility classification.     

High Speed Photon Number Resolving Detector with Titanium Transition Edge Sensor

We have developed new photon number resolving detectors with titanium transition edge sensors (Ti-TESs) for a high counting rate operation in quantum information. The titanium superconducting films were fabricated by ultra-high vacuum electron beam evaporation, and showed a sharp superconducting transition at 359 mK. The device was coupled to a single mode optical fiber, and cooled down to 100 mK. Some of optical responses of the devices were measured by illuminating heavily attenuated laser pulses at wavelengths of 405 and 1550 nm. As a result, the device showed a fast decay time constant of 300 ns, which enables the operation at the counting rate of 400 kcps. The energy resolution was 0.76 eV at 405 nm and 0.68 eV at 1.5 μm, that make it possible to clearly resolve the number of photons of incident laser pulses. These features of the high counting rate operation and the reasonable energy resolution are very promising for quantum information field.      

A phenolic antioxidant from the Pacific oyster (Crassostrea gigas) inhibits oxidation of cultured human hepatocytes mediated by diphenyl-1-pyrenylphosphine

3,5-Dihydroxy-4-methoxybenzyl alcohol (DHMBA), an antioxidant isolated from the Pacific oyster (Crassostrea gigas), was studied in a cell-based fluorometric antioxidant assay using human hepatocyte-derived cells (C3A) and diphenyl-1-pyrenylphosphine (DPPP) as a fluorescent probe. In comparison with two hydrophilic antioxidants, DHMBA showed the stronger inhibition of DPPP-mediated fluorescence than chlorogenic acid and l-ascorbic acid: at a concentration of 320 μM of DPPP, the inhibition was 26.4 ± 2.6%, 11.1 ± 1.2%, and 0 ± 2.0% for DHMBA, chlorogenic acid, and l-ascorbic acid, respectively (mean ± SD, n = 4). Their relative oxygen radical absorbance capacities (ORAC) were dissociated with their cell-based antioxidant activities: 1.47 ± 0.40, 4.57 ± 0.30, and 0.53 ± 0.13 μmol TE/μmol for DHMBA, chlorogenic acid, and l-ascorbic acid, respectively (mean ± SD, n = 4). The amphiphilicity of DHMBA was better than chlorogenic acid and l-ascorbic acid might underlie this dissociation. Since the C3A cells are human hepatoma-derived cells, DHMBA might be useful in the prevention and treatment of liver diseases by involving an oxidation process.     

加碘盐可调容积量杯计量装置的研制

介绍加碘盐自动包装机上的可调容积量杯计量装置的结构、容积调节原理及有关计算。     

螺杆钻具拆装架液压系统设计

本文叙述了一种用于各类螺杆钻具及其它种类螺纹连接管件拧卸与装配设备的液压系统设计,主要阐述了该系统的设计原理和设计计算。     

驻极体空气过滤材料消静电实验研究

选取4片不同级别的驻极体空气过滤材料,对滤料消除静电效应前后的计数效率和PM2.5净化效率等性能参数进行了试验研究,消静电方法采用的是异丙醇浸泡法,试验用气溶胶为KCl固态气溶胶。试验结果表明:采用异丙醇浸泡法能够在一定程度上消除驻极体过滤材料本身所带的静电;消除静电效应后滤料对不同粒径颗粒的计数效率均有所下降,特别是颗粒物粒径越小,过滤效率下降的幅度也越大;消静电后滤料对PM2.5的净化效率也有所下降。研究结果揭示了采用驻极体过滤材料制造而成的带静电过滤器在实际使用过程中可能存在的因静电消失后带来的效率下降风险,试验数据也能为将来空气过滤器国家相关标准的修订提供参考建议。