通信电源用电池技术现状与发展趋势

根据目前已在通信电源领域得到应用的几种电池类型,介绍了铅蓄电池、锂离子电池、燃料电池、液流电池以及各种组合式电源系统等各类技术应用的现状的技术现状和应用情况,分析了以上各类通信电源用电池技术的发展趋势。     

热浸镀Zn-0.2Al-Mg-Re合金镀层钢丝在NaCl溶液中的电化学行为

采用SEM,EDS和电化学测量技术,对热浸Zn-0.2Al-Mg-Re合金镀层钢丝的组织结构和电化学性质进行了分析与研究。结果表明Zn-0.2Al-Mg-Re合金镀层结构分为三层:外层为单相β-Zn固溶体,中间层为δ相(FeZn₇),内层为Γ相(Fe5Zn₂₁),镀层电位在0.5%NaCl溶液中恒电流电解腐蚀曲线和在5%NaCl溶液腐蚀过程中原位测量的电位与时间曲线上都出现了三个台阶,证实了低铝锌基合金镀层为多相层结构,且各相层具有不同的电化学性质,发现镀层在5%NaCl溶液腐蚀中的电极电位由表及里逐渐正移,阳极极化不具备明显的钝化特征,电极反应主要是受阴极的氧还原反应控制,这可能是由镀层的组织和保护膜的稳定性而引起的。     

集束微电极系统数据采集装置

在金属材料的腐蚀电化学研究中,了解材料表面瞬态电化学响应与变化的方法之一是测量表面瞬态的电势分布或阻抗分布,采用相应的数据采集系统是一种新的方法,着重介绍该系统的原理和结构。     

应用MgS基固体电解质直接测定硫含量的初步试验研究

在实验室条件下,自制了MgS与TiS₂两种硫化物,组成MgS—2%TiS₂'wt)并经过高温烧结处理。用MgS—2%TiS₂固体电解质组成硫浓差电池:
Mo[[S]Fe][MgS-2%TiS₂（wt）]Mo,MoS₂]Mo
于1375℃无保护气氛条件下进行了铁液定硫的试验。所测电势E与化学分析的[%S]关系为log[%S]=-0.3694-0.0077E（mV）（[%S]:0.013～0.134）。于1375℃下还测试了Cu-Cu₂S系的硫位。推算出表征固体电解质电子电导率大小的特征硫分压Pc’对MgS—2%TiS₂来讲为6×10^-4pa。引入pe’和硫活度系数f_s对E—[%S]关系进行了修正。     

黑磷纳米片−金纳米颗粒−顺铂光热/光动力治疗口腔鳞癌

为了改善口腔鳞状细胞癌(OSCC)的较低五年生存率的状况,开发由黑磷纳米片(BPNSs)和纳米金颗粒(AuNPs)组成的复合材料来治疗肿瘤.这项研究的目的是评估BPNSs、AuNPs装载顺铂(CDDP)对人舌鳞状细胞癌细胞系(SCC-9)与对7,12-二甲基苯并蒽诱导的黄金地鼠颊鳞状细胞癌动物模型的抑制作用.结果表明,...     

3.5%NaCl盐雾条件下Q235A-Z35钢的腐蚀行为研究

为了研究实船钢材在海洋大气环境下的腐蚀规律,在3.5%NaCl溶液环境中进行Q235A-Z35钢的盐雾腐蚀试验。通过宏观形貌观察、腐蚀失重分析、显微形貌观察、X射线衍射(XRD)物相分析以及腐蚀试样的电化学试验等方法研究了Q235A-Z35钢在盐雾腐蚀环境中的腐蚀行为。结果表明:在从0-96 h的腐蚀过程中其表面腐蚀产物的覆盖程度、致密程度都逐渐提高在短时间内的腐蚀条件下表面腐蚀产物以γ-FeOOH为主,而随着腐蚀时间的增加,腐蚀产物逐渐由疏松多孔的层絮状γ-FeOOH转变为致密的团状和块状的β-FeOOH和α-FeOOH;表面产生的腐蚀产物γ-FeOOH会促进钢的腐蚀,β-FeOOH和α-FeOOH能够抑制钢的腐蚀,并对钢材基体有一定的保护作用。     

Cu-P-RE耐候钢的耐蚀性能

通过干湿周浸加速腐蚀实验研究了不同稀土含量的耐候钢和对比普碳钢的腐蚀行为及其耐蚀性能.采用失重法测得了各试样的腐蚀率;结果发现,稀土耐候钢的腐蚀率远远低于普碳钢的,不同稀土含量的耐候钢的耐腐蚀性不尽相同.采用电化学交流阻抗技术对带锈钢样的表面锈层结构及电化学反应过程进行了研究,提出在本实验条件下钢电化学腐蚀的等效电路模型,计算出锈层电阻、极化阻抗等表征锈层性能的电化学元件参数值.稀土耐候钢锈层中存在半无限扩散和有限厚度扩散两种过程,有限厚度扩散极化阻抗反映了耐候钢内锈层的保护性能.     

Apicobasal Surfaceome Architecture Encodes for Polarized Epithelial Functionality and Depends on Tumor Suppressor PTEN

The loss of apicobasal polarity during the epithelial-to-mesenchymal transition (EMT) is a hallmark of cancer and metastasis. The key feature of this polarity in epithelial cells is the subdivision of the plasma membrane into apical and basolateral domains, with each orchestrating specific intra- and extracellular functions. Epithelial transport and signaling capacities are thought to be determined largely by the quality, quantity, and nanoscale organization of proteins residing in these membrane domains, the apicobasal surfaceomes. Despite its implications for cancer, drug uptake, and infection, our current knowledge of how the polarized surfaceome is organized and maintained is limited. Here, we used chemoproteomic surfaceome scanning to establish proteotype maps of apicobasal surfaceomes and reveal quantitative distributions of, i.e., surface proteases, phosphatases, and tetraspanins as potential key regulators of polarized cell functionality. We show further that the tumor suppressor PTEN regulates polarized surfaceome architecture and uncover a potential role in collective cell migration. Our differential surfaceome analysis provides a molecular framework to elucidate polarized protein networks regulating epithelial functions and PTEN-associated cancer progression.     

Host Cell Binding Mediated by Leptospira interrogans Adhesins

Leptospirosis is a neglected infectious disease with global impact on both humans and animals. The increase in urban development without sanitation planning is one of the main reasons for the disease spreading. The symptoms are similar to those of flu-like diseases, such as dengue, yellow fever, and malaria, which can result in a misleading clinical diagnosis. The characterization of host–pathogen interactions is important in the development of new vaccines, treatments, and diagnostics. However, the pathogenesis of leptospirosis is not well understood, and many gaps remain to be addressed. Here, we aimed to determine if Leptospira strains, virulent, culture-attenuated, and saprophytic, and the major outer membrane proteins OmpL37, OmpL1, LipL21, LipL41, and LipL46 are able to adhere to different endothelial, epithelial and fibroblast cell lines in vitro. We showed that virulent leptospires robustly bind to all cells compared to the culture-attenuated and saprophytic lines. The recombinant proteins exhibited certain adhesion, but only OmpL1 and LipL41 were able to bind to several cell lines, either in monolayer or in cell suspension. Blocking OmpL1 with polyclonal antibodies caused a decrease in bacterial binding to cells, contrasting with an increase observed when anti-LipL41 antibodies were used. The adhesion of OmpL1 to HMEC-1 and EA.hy926 was inhibited when cells were pre-incubated with collagen IV, suggesting that both compete for the same cell receptor. We present here for the first time the interaction of five leptospiral outer membrane proteins with several cell lines, and we conclude that LipL41 and OmpL1 may have an impact on leptospiral adhesion to mammalian cells and may mediate the colonization process in leptospiral pathogenesis.     

Influence of Metal Salts Addition on Physical and Electrochemical Properties of Ethyl and Propylammonium Nitrate

In this work, we deepen in the characterization of two protic ionic liquids (PILs), ethylammonium nitrate (EAN) and propylammonium nitrate (PAN). With this aim, we determined the influence of inorganic nitrate salts addition on their physical properties and their electrochemical potential window (EPW). Thus, experimental measurements of electrical conductivity, density, viscosity, refractive index and surface tension of mixtures of {EAN or PAN + LiNO₃, Ca(NO₃)₂, Mg(NO₃)₂ or Al(NO₃)₃} at a temperature range between 5 and 95 °C are presented first, except for the last two properties which were measured at 25 °C. In the second part, the corresponding EPWs were determined at 25 °C by linear sweep voltammetry using three different electrochemical cells. Effect of the salt addition was associated mainly with the metal cation characteristics, so, generally, LiNO₃ showed the lower influence, followed by Ca(NO₃)₂, Mg(NO₃)₂ or Al(NO₃)₃. The results obtained for the EAN + LiNO₃ mixtures, along with those from a previous work, allowed us to develop novel predictive equations for most of the presented physical properties as functions of the lithium salt concentration, the temperature and the water content. Electrochemical results showed that a general order of EPW can be established for both PILs, although exceptions related to measurement conditions and the properties of the mixtures were found.