一种智能开关控制算法及其在电阻炉微机群控系统中的应用

本文提出了一种对过程参数变化有较好适应性的智能开关控制算法，并介绍了该算法在实际电阻炉群控系统中的硬件和软件的实现。系统运行结果表明，该算法使用便利，需要整定的参数少，并有着较好的输出响应。     

The incorporation of H3-thymidine in newly differentiated nuclei of roots ofVicia faba

Zusammenfassung Bohnenwurzeln (Vicia faba) wurden mit H³-Thymidin behandelt. Autoradiographien zeigen Aufnahmen von DNS in Zellkernen, welche keine Zellteilungen mehr durchmachen.     

Normal larvae obtained from dark fragments of centrifugedCiona eggs

Riassunto Dei due frammenti, jalino e pigmentato, ottenuti per centrifugazione dall'uovo vergine diCiona intestinalis, solo il frammento scuro è capace di svilupparsi. Da esso può aversi una larva completamente normale. Questo risultato è spiegato attribuendo un valore morfogenetico ai mitocondri che sono presenti esclusivamente nel frammento scuro.     

改进的神经网络在路面结构参数设计中的应用

针对常规的路面模量反算算法复杂、运算速度慢的问题,为了克服传统神经网络的不足,文章利用改进的神经网络技术,对路面参数进行分析和预测,采用工程实践中某段路面施工状况FWD测量数据参数作为数据样本,通过样本训练,优化了路面结构参数值,扩大了应用范围,具有较强的实用性。     

Widespread amphibian extinctions from epidemic disease driven by global warming

As the Earth warms, many species are likely to disappear, often because of changing disease dynamics. Here we show that a recent mass extinction associated with pathogen outbreaks is tied to global warming. Seventeen years ago, in the mountains of Costa Rica, the Monteverde harlequin frog (Atelopus sp.) vanished along with the golden toad (Bufo periglenes). An estimated 67% of the 110 or so species of Atelopus, which are endemic to the American tropics, have met the same fate, and a pathogenic chytrid fungus (Batrachochytrium dendrobatidis) is implicated. Analysing the timing of losses in relation to changes in sea surface and air temperatures, we conclude with 'very high confidence' (> 99%, following the Intergovernmental Panel on Climate Change, IPCC) that large-scale warming is a key factor in the disappearances. We propose that temperatures at many highland localities are shifting towards the growth optimum of Batrachochytrium, thus encouraging outbreaks. With climate change promoting infectious disease and eroding biodiversity, the urgency of reducing greenhouse-gas concentrations is now undeniable.     

Baclofen对大鼠新鲜分离DRG神经元GABA和NMDA激活电流的抑制作用

用全细胞膜片箝技术在大鼠新鲜分离的背根神经节 (DRG)细胞上观察到baclofen对GABA和NMDA激活电流有调制作用。单独给予DRG细胞baclofen (1～ 10 0 μmol/L)未记录到可测的电流改变 ,但预加baclofen对GABA和NMDA激活电流具有明显的抑制作用 ,且呈剂量依赖性。 10 0 μmol/Lbaclofen对GABA和NMDA激活电流分别抑制(5 1.2± 10 .9) % (X±SE ,n=8,P <0 .0 1)和 (6 4 .1± 2 1.1) % (X±SE ,n=6 ,P <0 .0 1) ,此抑制作用是可逆的 ,可被GABAB 受体拮抗剂saclofen(10 0 μmol/L ) 所取消 (n =4 )。     

浅析阿坝州的环境问题与对策

本文着重分析了岷江上游的生态环境和工业污染现状,针对存在的主要问题和急需采取的对策,笔者提出了建议,对于搞好阿坝州的环境保护工作,持续、稳定、协调地发展阿坝州的经济具有一定的参考意义。     

增强健壮性的一个多层DSS模型

当前决策支持系统（ＤＳＳ，ＤｅｃｉｓｉｏｎＳｕｐｐｏｒＳｙｓｔｅｍ）在实际应用中遇到许多问题，其中一个问题是“脆弱”性问题。本文分析了ＤＳＳ“脆弱”性的主要表现：缺乏决策功能约束，决策模型单一，固定的决策方法以及开放性能差。为此，提出一个多层ＤＳＳ模型，使ＤＳＳ更具实用性。