数字温度传感器自适应动态补偿方法

针对数字温度传感器具有较大温度滞后性的缺点,将自适应决策与基于数字滤波方法的动态补偿有机结合,提出了一种数字温度传感器自适应动态补偿方法:利用后向差分法设计的数字滤波器,实现了数字温度传感器工作频带扩展,完成了其动态补偿,并在动态补偿后面串联一个数字低通滤波器,以防高频噪声干扰;根据数字温度传感器的输出量、数字低通滤波的输出结果以及决策阈值,自适应地选择是否需要动态补偿,避免了补偿过度.以高精度数字温度传感器DS1624为补偿对象的实验表明,这种白适应动态补偿方法大大改善了数字温度传感器的动态性能,响应时间缩短至补偿前的30%～40%.     

计算机生成中国传统祥云动画

开展用计算机生成具有中国民族特色动画的研究,对弘扬我国传统艺术和提高中国动画片竞争力都有重要意义。祥云图案历史悠久,是最富有中国特色的吉祥图案之一,现有的大部分研究工作主要针对真实感烟云的模拟和绘制,而对生成中国传统风格祥云动画的研究工作还很少。为此提出一个祥云动画生成模型。首先利用椭圆来构造云朵的骨架曲线,沿着曲线上的非均匀分布点排列多个半径不同的基本圆,然后通过对这些基本圆进行求并运算来生成云朵内部区域和轮廓线;通过控制基本圆沿以分布点为圆心的圆周上运动,来生成连续变化的轮廓线和云朵形状;利用轮廓线上的运动点作为起点,沿中心点方向绘制云尾内卷线条。实验结果表明,利用该模型用户可以生成各类具有中国传统风格的祥云动画。     

Light-emitting diodes enhanced by localized surface plasmon resonance

Light-emitting diodes [LEDs] are of particular interest recently as their performance is approaching fluorescent/incandescent tubes. Moreover, their energy-saving property is attracting many researchers because of the huge energy crisis we are facing. Among all methods intending to enhance the efficiency and intensity of a conventional LED, localized surface plasmon resonance is a promising way. The mechanism is based on the energy coupling effect between the emitted photons from the semiconductor and metallic nanoparticles fabricated by nanotechnology. In this review, we describe the mechanism of this coupling effect and summarize the common fabrication techniques. The prospect, including the potential to replace fluorescent/incandescent lighting devices as well as applications to flat panel displays and optoelectronics, and future challenges with regard to the design of metallic nanostructures and fabrication techniques are discussed.     

大型循环流化床锅炉炉膛颗粒速度的光学测量

循环流化床锅炉炉膛内的颗粒速度分布对炉内燃烧、传热和受热面磨损均具有重要影响。在一台330 MW循环流化床锅炉炉膛水冷壁上开设测孔,利用水冷激光光纤测枪结合互相关计算对炉膛内的颗粒轴向速度进行了测量,研究了炉膛近水冷壁区的颗粒轴向速度水平分布、“环-核”边界层厚度、颗粒团贴壁下滑速度以及气固相滑移速度。结果表明,炉膛贴壁面位置颗粒轴向速度为负值,随着与壁面距离的增加,颗粒轴向速度逐渐转为正向,颗粒由下降流过渡到上升流动。颗粒“环-核”边界层厚度在0.1~0.2 m,且炉膛下部测点的边界层边界厚度略大于炉膛上部测点,颗粒团贴壁下滑速度均小于1 m/s。炉膛中心区气固相滑移速度为2.05~2.73 m/s,大于单颗粒终端速度。     

Successful delayed thrombolytic therapy in a patient with massive pulmonary embolism

Pica is the persistent, culturally and developmentally inappropriate ingestion of non-nutritive substances (DSM-IV). AB is a 75-year-old lady with a 40-year history of schizophrenia and a 20-year history of pica who, at emergency laparotomy, had 175.32 Pounds of loose change in her stomach. Although pica has been reported to coexist with schizophrenia, she had had no positive symptoms of schizophrenia for at least 20 years. She has CT evidence of fronto-tempotal atrophy most marked on the left in the temporal lobe and on the right in the frontal lobe. Pica has been found to be related to cognitive deficits and hyperoral behaviour to temporal lesions. Neuropsychological testing reveals deficits closely related to these changes.     

寻找公共树的一种计算机算法

用公共树转换的方法求出两个具有相同边集和相同秩的图的所有公共树,同时求出相应的公共树的符号,并给出了实现算法的程序框图。     

Validation of [13C]urea breath test for Helicobacter pylori using a simple gas chromatograph-mass selective detector

OBJECTIVE: Isotope ratio mass spectrometry (IRMS) is the accepted method for accurately measuring the 13CO2:12CO2 ratio in the non-invasive and non-radioactive [13C]urea breath test (13C-UBT) for Helicobactor pylori. The IRMS instrument, an expensive and highly specialized analyser, is rarely available. The objective of this project was to modify and validate the use of a simple bench-top gas chromatograph-mass selective detector (GC-MSD) for 13C-UBT. METHODS: Breath samples from 71 patients were taken at baseline and 30 min after ingestion of 100 mg [13C]urea. The breath samples were analysed using GC-MSD in the selected ion monitoring mode. The reference 13CO2:12CO2 ratio was from NBS19 obtained from the US National Institute of Standards and Technology. 13CO2:12CO2 ratios of the breath samples were determined. Excess delta per thousand (per mil, delta/thousand) of the 30 min sample over the baseline (deltadelta/thousand) of > or = 6deltadelta/thousand was considered H. pylori positive. Results from 13C-UBT and histology determined blind to each other were compared. RESULTS: The coefficient of variation of the reference 13CO2:12CO2 ratio was 0.06%. Using histology as the 'gold standard', the sensitivity (97.9%) and specificity (95.8%) of the GC-MSD 13C-UBT were comparable to those of other methods of H. pylori diagnosis. CONCLUSION: A gas chromatograph coupled to a mass selective detector that is available in many analytical and biomedical laboratories can be used for the 13C-UBT. This method will increase the availability and reduce the cost of this non-invasive, non-radioactive diagnostic test.     

Synthesis and antiplatelet, antiinflammatory, and antiallergic activities of substituted 3-chloro-5,8-dimethoxy-1,4-naphthoquinone and related compounds

2-Amino (6), 2-alkylamino (7-8), 2-methoxy (9), 2-acetamido (10), and 5,8-diacetoxy (11) derivatives of the lead compound 2,3-dichloro-5,8-dimethoxy-1,4-naphthoquinone (4) were synthesized, together with 6,7-dichloro-5,8dimethoxy-1,4-naphthoquinone (5), a positional isomer of 4. Antiplatelet, antiinflammatory, and antiallergic activities were evaluated, and most compounds were quite potent in all assays. Compounds 5 and 9-11 were especially active; however, 5 was ineffective against neutrophil superoxide formation, and 10 was ineffective against mast cell degranulation.     

Basic and acidic fibroblast growth factors protect spinal motor neurones in vivo after experimental spinal cord injury

We studied the effect of a single focal injection of recombinant basic (FGF2) or acidic (FGF1) fibroblast growth factor on the survival of spinal motor neurones at 24 h after a standardized spinal cord contusion injury (SCI) in the rat. Both FGF2 and FGF1 (3 microg), microinjected into the injury site at 5 min post-injury (p.i.), protected at least two functionally important classes of spinal motor neurones, autonomic preganglionic neurones in the intermediolateral (IML) column and somatic motor neurones in the ventral horn (VH). Moreover, there was enhanced choline acetyltransferase (ChAT) immunoreactivity in surviving VH and IML neurones, suggesting an improved functional status. Thus, neurotrophic factors such as FGF2 and FGF1 may contribute to an overall strategy to treat acute SCI and improve recovery of function.     

微波瓷用金水的研制

分析了微波瓷用金水研制的原理，研究了复合改制，增黄剂及树脂的作用，研制了能在750℃-850℃烤烧的微波金水。