大型精密仪器使用效益评估

对大型精密仪器的使用效益采用数学综合模式进行统计分析评估,提出大型精密仪器寿命周期管理的三个不同阶段及其各相应阶段效益评估的侧重点.     

Mutations in Rab3a alter circadian period and homeostatic response to sleep loss in the mouse

Rab3a is the most abundant Rab (ras-associated binding) protein in the brain and has a regulatory role in synaptic vesicle trafficking. Mice with a targeted loss-of-function mutation in Rab3a have defects in Ca(2+)-dependent synaptic transmission: the number of vesicles released in response to an action potential is greater than in wildtype mice, resulting in greater synaptic depression and the abolishment of CA3 mossy-fiber long term potentiation. The effect of these changes on behavior is unknown. In a screen for mouse mutants with abnormal rest-activity and sleep patterns, we identified a semidominant mutation, called earlybird, that shortens the circadian period of locomotor activity. Sequence analysis of Rab3a identified a point mutation in the conserved amino acid (Asp77Gly) within the GTP-binding domain of this protein in earlybird mutants, resulting in significantly reduced levels of Rab3a protein. Phenotypic assessment of earlybird mice and a null allele of Rab3a revealed anomalies in circadian period and sleep homeostasis, providing evidence that Rab3a-mediated synaptic transmission is involved in these behaviors.     

基于深度残差适配网络的通信辐射源个体识别

为解决通信辐射源识别中传统的人工特征提取方法鲁棒性不足和深度学习方法需要大量带标签目标域数据的问题,提出一种基于深度残差适配网络的通信辐射源个体识别方法.应用深度学习技术实现从源域到目标域上的迁移识别,只需要将带标签的源域数据和无标签的目标域数据进行训练.原始通信辐射源信号经过预处理后输入网络训练,将源域和目标域的分布...     

土壤水、热和溶质耦合运移研究进展

总结和概括了国内外土壤水热耦合运移、土壤水和溶质耦合运移及土壤水、热和溶质耦合运移研究的基本理论和代表性成果。Philip-De Vries和De Vries的土壤热耦合运动方程与Taylor-Cary基于不可逆热力学定律的线性流动方程是土壤水热耦合运移研究的两种主要理论。土壤水和溶质迁移的数学模型，可分别由水分运动、溶质运移两个方程耦合组成。Nassar关于土壤水、热和溶质耦合运移理论的研究取得了一定进展。在此基础上，探讨了土壤水、热和溶质运移耦合系统需要进一步研究的问题。     

矩菜缺素症状及焉耆垦区甜菜营养生理性病害的诊断

1998－2000年通过室内溶液培养和田间调查分析，对甜菜缺素症状与田间诊断进行了研究。结果表明，甜菜缺乏必须营养元素会表现出其特有的缺素症状，但甜菜营养生理性病害的田间诊断不仅要通过缺素症状进行形态诊断，还应结合化学诊断来综合判断其发生原因。     

Catastrophe mechanism and classification of discontinuity behavior in thermal science (I)

The mechanism of discontinuity behavior has important significance in the study of thermal science, such as fire, combustion, explosion and heat transfer. This sort of discontinuity behavior and the catastrophe caused by system nonlinearity may be equivalently classified according to the catastrophe model promulgated by catastrophe theory. Under the conditions of uniform temperature and thermal isolation, the self-ignition behavior of a Semenov System can be viewed as a result of the fold catastrophe of the system.     

白花夏枯草对高原家兔骨髓各级幼红细胞Feret直径的研究

本文应用透射电镜技术对平原移居高原（海拔３９００米）实验家兔骨髓内各级红系细胞电镜照片的费莱特直径（Ｆeret)进行了研究，实验分平原对照组，高原给药及高原对照三个组，实验结果：高原给药组骨髓原红，早、中，晚幼红细胞Ｆeret直径均低于高原对照组，差别有显著性，结果提示白花夏枯草可降低由低氧引起的各级幼红细胞胸体增大，从而降低血液的粘滞性，改善血循环。     

清末新军建设述评

从20世纪中国军队近代化的宏观角度看,清末新军建设不仅编练了一支新型的近代化军代,而且带来了中国军事制度的根本性变革,堪称中国军事近代化的肇端.但从清王朝练军自求的微观角度看,新军却变成了王朝的掘墓了,不能说新军建设不是一次惨重的失败.封建主义的国家机体难以移植资本主义的军事制度;落后的农业经济承受不起近代化军队建设的重负;动荡的末代政局无法保障军制改革和军队建设的顺利进行,是新军建设失败的3个重要原因.     

固载杂多酸PW12/SiO2催化合成烷基糖苷的研究

以固载杂多酸Pw