阴极铝箔化学腐蚀工艺研究──Ⅱ．关于阴极铝箔容量衰减问题

在３０％酒石酸铵溶液中用恒定阳极电流测定阴极箔的计时电压（Ｅ－ｔ）曲线，根据曲线转折电压Ｅ转判断表面氧化膜相对厚度，发现膜厚与电容量有很好对应关系。用ｐＨ＝２磷酸钝化液处理的箔在刚生产出来时表面氧化膜很薄，随时间增厚，容量下降幅度大。改用ｐＨ＝３．４磷酸钝化液，形成的氧化膜较厚，较稳定，容量下降得到改善。对此作了分析探讨。     

2D DOA estimation for noncircular sources using L-shaped sparse array

We present an algorithm for two-dimensional (2D) direction-of-arrival (DOA) estimation of noncircular sources using an L-shaped sparse array. An L-shaped sparse array consisting of two co-prime arrays is firstly introduced. Then, the fourth-order-cumulants (FOCs) of received data are used to construct a FOC matrix (FOCM), by which we can get the estimations of elevation angles. With the estimated elevation angles, the azimuth angles can be estimated by a low-complexity signal separation algorithm. During the procedure used for estimating azimuth angles, no any eigenvalue decomposition (EVD), peak search and pair-matching procedure need to be implemented. Although the aperture is extended significantly, the computation complexity of proposed algorithm still is acceptable. Compared with some analogous algorithms, our approach shows more attractive estimation performance. A lot of simulation results prove the advantages of proposed DOA estimation technology.     

业务财务一体化需求分析思路与方法研究

首先介绍电信运营商实施业务财务一体化的外部驱动力及意义,然后介绍3种实施业务财务一体化的需求分析思路与方法,最后给出电信运营商业务财务一体化实施方法建议及对实施难点的探讨。     

ATM无源光网络中直流耦合突发模式光接收机分析

本文根据异步传输模式(ATM)无源光网络(APON)的实际要求,对直流耦合突发模式光接收机进行了理论分析,结果表明基于动态峰值检测的突发模式接收机其灵敏度代价和传输容量代价过高,而基于局部峰值检测的突发模式接收机则可较好满足APON的要求.     

悬停直升机检测问题研究

主要研究悬停直升机目标的检测问题。首先描述直升机旋翼的理想后向散射模型,分析了直升机理想旋翼回波时域上的调制特点和频域上的分布特征。并据此讨论了检测中需要考虑的问题的问题和要求。最后,提出了一种以小波变换为工具进行信号处理、利用直升机目标旋翼的回波闪烁幅度的数目进行检测的新方法,计算机仿真验证此方法是有效的。     

计算机在通信技术应用中发展研究

随着社会的发展,人们对通信质量的需求不断提高,计算机技术在通信领域中的应用使通信变得更加便捷.计算机是信息通信时代的基础,是现代和未来信息时代一项重要的信息基础设施,为信息的传递提供高效、统一、高速的通信环境.     

冠醚液晶/PVC二元复合膜的温控离子渗透作用(英文)

冠醚液晶具有液晶的有序性和冠醚络合金属离子的特性,采用单臂冠醚液晶成功地用粒模拟生物膜的离子传输,首次提出了冠醚液晶和PVC的二元复合膜,这种新的仿生膜模型种巧妙地模拟生物膜的温控传输,能更充分发挥膜传输中液晶的基本功能。因此,提出了冠醚液晶分子在液晶志时能自组装成离子通道传输离子。     

A Network-Level Connected Autonomous Driving Evaluation Platform Implementing C-V2X Technology

With the emerging connected autonomous driving paradigm,more advanced applications leveraging vehicular communications are drawing tremendous attentions.In orde...     

Betaine Alleviates High-Fat Diet-Induced Disruption of Hepatic Lipid and Iron Homeostasis in Mice

Non-alcoholic fatty liver disease (NAFLD) is characterized by excessive fat deposition in the liver, which is often associated with disrupted iron homeostasis. Betaine has been reported to be hepatoprotective, yet whether and how betaine ameliorates high-fat diet-induced disruption of hepatic lipid and iron homeostasis remains elusive. In this study, mice were fed either standard (CON) or high-fat diet (HFD) for 9 weeks to establish a NAFLD model. Mice raised on HF diet were then assigned randomly to HF and HFB groups, HFB group being supplemented with 1% (w/v) of betaine in the drinking water for 13 weeks. Betaine supplementation significantly alleviated excessive hepatic lipid deposition and restored hepatic iron content. Betaine partly yet significantly reversed HFD-induced dysregulation of lipogenic genes such as PRARγ and CD36, as well as the iron-metabolic genes including FPN and HAMP that encodes hepcidin. Similar mitigation effects of betaine were observed for BMP2 and BMP6, the up-stream regulators of hepcidin expression. Betaine significantly rectified disrupted expression of methyl transfer gene, including BHMT, GNMT and DNMT1. Moreover, HFD-modified CpG methylation on the promoter of PRARγ and HAMP genes was significantly reversed by betaine supplementation. These results indicate that betaine alleviates HFD-induced disruption of hepatic lipid and iron metabolism, which is associated with modification of CpG methylation on promoter of lipogenic and iron-metabolic genes.     

不同酯化度果胶钙的结构特征与体外消化稳定性

为探究不同酯化度（DE）果胶形成的果胶钙的结构特征与消化稳定性,采用5种DE值的果胶与氯化钙反应获得5种DE的果胶钙,比较其产率、钙含量,红外、X衍射（XRD）、电镜（SEM）等结构特征与体外模拟消化稳定性。结果表明：果胶钙产率为50%～87%;DE=10%的果胶与Ca2+反应形成的果胶钙（DE10-CaP）的钙含量最高（88 mg/g）,DE59-CaP钙含量最低（43.6 mg/g）;果胶钙中Ca2+与羧酸根的结合形式为单齿配位结合型,并可分为3种结合区域,进一步完善了果胶钙的结合模式;XRD表明低酯果胶钙比高酯果胶钙多一处2θ=21.5°的衍射峰;SEM表明低酯果胶钙的表观结构更紧密,呈块状,高酯果胶钙则呈薄片状。体外模拟胃肠消化试验表明,高酯果胶钙的钙释放率及释放量更高。本研究有助于了解果胶钙的微观结构及应用性能。