基于神经网络的电力电能自适应测量方法

详细介绍了基于神经网络的电力电能自适应测量方法，给出系统原理图及电力电能测量误差自动校正方法；首次提出了LEA判别法，从而实现了梯度牛顿法的有效结合神经网络学习方法；采用DSP技术实现了电能实时快速测量，给出了实验结果。     

A LEA Gene Regulates Cadmium Tolerance by Mediating Physiological Responses

In this study, the function of a LEA gene (TaLEA1) from Tamrix androssowii in response to heavy metal stress was characterized. Time-course expression analyses showed that NaCl, ZnCl(2), CuSO(4), and CdCl(2) considerably increased the expression levels of the TaLEA1 gene, thereby suggesting that this gene plays a role in the responses to these test stressors. To analyze the heavy metal stress-tolerance mechanism regulated by TaLEA1, TaLEA1-overexpressing transgenic poplar plants (Populus davidiana Dode × P. bollena Lauche) were generated. Significant differences were not observed between the proline content of the transgenic and wild-type (WT) plants before and after CdCl(2) stress. However, in comparison with the WT plants, the TaLEA1-transformed poplar plants had significantly higher superoxide dismutase (SOD) and peroxidase (POD) activities, and lower malondialdehyde (MDA) levels under CdCl(2) stress. Further, the transgenic plants showed better growth than the WT plants did, indicating that TaLEA1 provides tolerance to cadmium stress. These results suggest that TaLEA1 confers tolerance to cadmium stress by enhancing reactive oxygen species (ROS)-scavenging ability and decreasing lipid peroxidation. Subcellular-localization analysis showed that the TaLEA1 protein was distributed in the cytoplasm and nucleus.     

Cellular Chaperone Function of Intrinsically Disordered Dehydrin ERD14

Disordered plant chaperones play key roles in helping plants survive in harsh conditions, and they are indispensable for seeds to remain viable. Aside from well-known and thoroughly characterized globular chaperone proteins, there are a number of intrinsically disordered proteins (IDPs) that can also serve as highly effective protecting agents in the cells. One of the largest groups of disordered chaperones is the group of dehydrins, proteins that are expressed at high levels under different abiotic stress conditions, such as drought, high temperature, or osmotic stress. Dehydrins are characterized by the presence of different conserved sequence motifs that also serve as the basis for their categorization. Despite their accepted importance, the exact role and relevance of the conserved regions have not yet been formally addressed. Here, we explored the involvement of each conserved segment in the protective function of the intrinsically disordered stress protein (IDSP) A. thaliana’s Early Response to Dehydration (ERD14). We show that segments that are directly involved in partner binding, and others that are not, are equally necessary for proper function and that cellular protection emerges from the balanced interplay of different regions of ERD14.     

基于瑞萨单片机的四旋翼自主飞行器设计

该四旋翼自主飞行器以瑞萨公司的R5F100LEA单片机为控制核心,包括飞行姿态处理模块,超声波测距模块,红外传感器循迹模块,电机驱动模块以及微处理器模块等.飞行姿态处理由MPU6050加速度计陀螺仪提供,保证飞行器平稳飞行.超声波测距模块和红外传感器循迹模块为飞行器提供导航参数使飞行器可以按照规定航线并以一定高度飞行.本设计中应用了PPM控制方法,PID算法,平滑滤波等,使飞行器实现在一定区域内一键式起飞,稳定飞行,精确降落.并且可以拾取物件,完成空投任务,最终精确降落并停机.     

A chromatographic theory based on the concept of a layer of equilibrium adsorption

The LEA model has been analyzed by comparing to other Chromatographic theoretical approaches. In the LEA model a layer of equilibrium adsorption, L_e, serves as an effective kinetic constant. For the layer L_e the concentration issuing from this layer is in equilibrium with the average value of adsorption on the whole layer at any moment of time. The value of L_e is determined from all factors which broaden the Chromatographie zone. Such an approach permits us to combine the features of the mass balance (solute continuity in a Chromatographie column), of the mass transfer phenomenon, and of the adsorption isotherm into a single first order differential equation. Apart from other layer-by-layer models, the LEA model supposes that over the whole column a continuous (real) distribution of adsorption a (L, t) and concentration c (L, t) is observed. The usefulness of the LEA model in developing a Chromatographic theory has been discussed.     

2009年国外高超声速技术发展概述

全面综合美国、俄罗斯、法国等军事强国2009年高超声速技术领域的新进展,重点介绍了X-51A、FALCON、Vulcan、LEA等重点项目的发展情况,并在此基础上对2009年世界高超声速技术发展的特点进行了分析和总结。     

一种基于改进的LEA头部姿态估计方法

局部嵌入分析(LEA)是图嵌入化的局部线性嵌入(LLE)方法。在头姿态估计问题上,选择局部邻域时只考虑属于同一类的姿态,但失去了相邻姿态的几何拓扑信息。为此,提出一种改进的邻域选择方法,充分利用先验姿态信息,使降维后的流形更加平滑,同类姿态互相靠近,不同类姿态之间的距离随着姿态差值变大而增大,且能够使训练及测试样本的低维流形更加靠近,降低了估计误差。在Facepix人脸数据库上的实验证明了该方法的有效性。     

Border gateway function performance requirements for the lawful intercept of voice at IMS architecture

Lawful intercept is a mandatory regulatory service that must be available when delivering voice services over packet-based networks. The carrier should be capable of providing the law-enforcement authorities with logged information about calls originated and terminated by a particular subscriber. Moreover, the carrier should also be able to intercept subscribers’ call-content (e.g., voice conversations). In both cases, the interception should be undetectable by the intercepted subscriber or other callers. Despite the importance of the topic, little effort has been made so far to analyze the performance aspects of lawful intercept in a packet-based network.This paper presents an overall analysis of the performance requirements of the border gateway function at the IMS architecture for lawful call-content interception on an end-to-end packet-based network with only voice packets. In particular, various performance characteristics of the VoIP transmission, like VoIP traffic and VoIP signaling traffic, with an emphasis on the SIP, were investigated in order to determine the margins of the border gateway function's performance requirements where an efficient and undetectable transfer of lawful call-content interception over packet-based networks can be expected.     

The effects of drying following heat shock exposure of the desert moss Syntrichia caninervis

Desert mosses are components of biological soil crusts (BSCs) and their ecological functions make assessment and protection of these mosses a high-ranking management priority in desert regions. Drying is thought to be useful for desert mosses surviving heat shock. In this study, we investigated the role of drying by monitoring the responses of physiological characters and asexual reproduction in the typical desert moss Syntrichia caninervis. Heat significantly decreased chlorophyll content and weakened rapid recovery of photochemical activity, and increased carotenoid content and membrane permeability. Lethal temperatures significantly destroyed shoot regeneration potential. In comparison with heat alone, drying significantly increased protonema emergence time and depressed protonema emergence area. Drying combined with heat accelerated water loss, followed by a decrease of photosynthetic activity. Drying had different influences on membrane permeability at different temperatures. When moss leaves were subjected to a combined stress of drying and heat shock, photosynthesis was maintained mainly due to the effects of drying on physiological activity although the cellular morphological integrity was affected. Drying caused opposing effects on moss physiological and reproductive characteristics. On the one hand, drying caused a positive synergistic effect with heat shock when the temperature was below 40 °C. On the other hand, drying showed antagonism with heat shock when the moss was subjected to temperatures higher than 40 °C. These findings may help in understanding the survival mechanism of dessert mosses under heat shock stress which will be helpful for the artificial reconstruction of BSCs.     

The implications of the GCSE and CPVE on the use of computers in schools

Abstract The introduction of the General Certificate of Secondary Education (GCSE) and the Certificate of Pre-Vocational Education (CPVE) has influenced the quantity and type of computer use in secondary schools. This paper looks at the effects of these influences and examines ways in which schools and Local Education Authorities can accommodate them in the context of their more general development plans.