Functional magnetic resonance imaging of amphetamine craving

The aim of this study is to identify the brain activity associated with amphetamine craving for understanding the neurobiology of addiction by watching pictures of happy, sad or amphetamine. Brain activity was measured in 12 amphetamine addicts and 12 healthy subjects by fMRI while the subjects watched pictures designed to elicit happy feelings, sad feelings, or the desire to use amphetamine. The result demonstrated that amphetamine cues led to abnormally high cingulate and low frontal lobe activation in amphetamine addicts, who showed abnormalities in affect-related brain activation.     

An ERP study for the degrees of the difficulty in visual search

The present study mainly probed the relationships between ERP components and the degrees of difficulty in visual search. Three experimental and one controlled conditions were randomly selected. Results showed that the P1, N1, and P2 amplitudes and latencies had no significant differences among the three experimental and one controlled conditions, and the ERP waveforms of low perceptual load of visual search were different from that of high perceptual load. These results might indicate that the latencies and amplitudes of initial P1, N1 and P2 in high and low perceptual load conditions were almost the same. The ERP waveforms of parallel search were very different from that of serial search, and the ERP waveforms of serial search were very similar. The P3 amplitudes increased as the degrees of the difficulty in visual search decreased.     

基于PLC的温度控制在电镀生产线中的应用

介绍了以三菱FX0NPLC为核心的温度控制系统在电镀生产线中的应用。简述了温度控制原理,论述了控制系统的设计方案及其软硬件的实现方法。实践表明该方法简单易行,适应性好,可靠性高。     

Molecular cloning and expression of interleukin Ibeta (IL-1β) from red seabream (Pagrus major)

The interleukin 1β (IL-1β) cDNA was cloned from the red seabream (Pagrus major) by homology cloning strategy. A cDNA fragment was amplified by PCR using two degenerated primers, which were designed according to the conserved regions of other known IL-1β sequences, and elongated by 3' ends and 5' ends RACE PCR to get the full length coding sequence of red seabream IL-1β (RS IL-1β). The sequence contained 1252 nucleotides that included a 5' untranslated region (UTR) of 84bp, a 3' UTR of 410 bp and an open reading frame (ORF) of 759 nucleotides which could be translated into a putative peptide of 253 amino acids with molecular weight of 28.6 kD and putative isoelectric point pI of 5.29. The deduced peptide contained two potential N-glycosylation sites and an identifiable IL1 family signature, but lacked the signal peptide and the clear ICE cut site, which were common in other nonmammalian IL-1β genes. The RS IL-1β had the highest homology with piscine IL-1β according to phylogenetic tree analysis.     

列车调度指挥信息系统实施分析

介绍了列车调度指挥信息系统的网络结构和功能以及信息数据流程，分析了系统实施后存在的问题，并提出了相关建议。     

Development of Full Automatic External Welding Machine for Annular Welds of Pipeline

To meet the demands of rapid development of pipeline constructions in China, a complete set of full automatic external welding machine for annular welds of pipeline and welding procedure have been developed thereof. The system has been applied in the “West-East Pipeline Project” and its performance is proven. With this welding machine the welding parameters can be either preset before or adjusted in real time during the welding process, which avoids the blemishes of same type domestic and international products. Thus it is best propitious to in-situ construction conditions and workers‘ technical level in China. In this article the development of mechanical and control systems of this product is introduced and typical welding procedure parameters are provided.     

长春市城郊无公害农业土壤环境中As含量状况调查研究

通过对长春市城郊无公害农业土壤环境中As含量水平调查,并进行了相对于无公害农作物产地环境质量标准中有关As的污染性评价,得出长春市城郊农业土壤环境中As的含量水平状况。长春市城郊无公害农业土壤环境中As含量存在不均衡性;浓度范围在4 12μg/g～18 60μg/g之间,平均值为12 17μg/g;污染呈现出从西南至东北的带状趋势;以《农产品安全质量无公害蔬菜产地环境要求》中GB/T18407 1-2001规定的As的质量标准作为评价标准进行评价,长春市城郊农业土壤环境中As的标准污染指数均小于1,属于未受As污染的土壤类型。图3,表2,参6。     

关于2-群的注记

通过对2-群的研究，得到了一类2-群的结构，进而给出了一类无限2-群有无限的阿贝尔子群的例子．     

制备介孔复合环境材料的酸洗刻蚀工艺

探索了一种制备介孔复合环境材料的方法--破坏式造孔与有机复合相结合,使最终产品可大量吸附污染水体中的各种污染物并具有一定的杀菌功能.该方法通过酸洗刻蚀,达到了去除原材料中的杂质和刻蚀孔径的目的,所制备的中间产品24h吸湿率为原材料的2倍,染料吸附量为原材料的1.6倍.     

论司马迁的商品经济创新思想

商品经济是否发达是某一历史时期社会发展的一个主要表现。但是,西汉时期,在前代统治者奉行“重农抑商”政策的情况下,在汉武帝独尊儒术强化思想统治的时候,司马迁能够首创经济史传,第一个系统的考察商品经济的发展及其特征,提出了一整套发展生产、扩大商品交换、富国富家的经济理论,总结了商人在商品经济中的作用以及经营管理之道,不仅使西汉走向了繁荣,而且达到了划时代的最高水平。司马迁的商品经济创新思想能发表在那样的时期,他的胆略和精神是难能可贵的,是值得我们认真清理的一笔财富。