泥质砂岩的三种导电模型的研究

在泥质砂岩的电测井解释模型中，目前比较流行的有三种导电模型，即Ｗ－Ｓ模型，Ｄ－Ｗ模型和Ｄ－Ｌ模型。泥质砂岩油气水层评价中需要对这三种模型的适应性进行评价。文中通过选取ＮＹ油田的２０块泥质砂岩样品以实验方法测定其阳离子交换量（Ｑｖ），并通过三种理论模型计算Ｑｖ进行比较研究。结果表明：Ｗ－Ｓ模型优于Ｄ－Ｌ模型，而Ｄ－Ｌ模型优于Ｄ－Ｗ模型，从而为测井地层评价提供了理论依据。     

有耗网络S参数特征相位的统计约束

本文从大数统计角度，对有耗网络理论作了进一步深入研究。文中揭示了有耗网络除Ｈｅｒｍｉｔｅ矩阵正定性所造成的不等式约束而外，还存在一类重要的特征相位分布的统计约束，现有实验结果与本文结论相容。     

Aloe vera-based antibacterial porous sponges for wound dressing applications

Journal of Porous Materials - The antibacterial sponges with high macroporosity, high interconnectivity and high biocompatibility is a significant concern for wound healing applications. In this...     

A system-wide approach to minimize the operational cost of bench production in open-cast mining operations

International Journal of Coal Science & Technology - The production cycle of open-cast coal mines generally includes drilling, blasting, loading, hauling and coal preparation activities....     

可见光通信光正交频分复用系统符号分解技术抑制LED非线性失真研究

传统重复信号限幅(ISC)技术可以减小非线性LED光正交频分复用(O-OFDM)系统的非线性限幅噪声影响。但ISC系统需要多个LED同时发光,同步和硬件实现复杂,并且误码率(BER)随着信道增益差异的增大而变大。基于此,提出基于单个LED的O-OFDM符号分解串行传输系统,对O-OFDM符号进行限幅分解,然后串行组帧,最后输入到单个LED中。推导了系统理论信噪比表达式,并建立了蒙特卡罗误码率和误差矢量幅度(EVM)仿真模型。结果表明,随着符号分解次数增大,EVM和BER性能显著变好,但通信速率略有下降,并且直流偏置会影响EVM和BER性能。本系统实现简单,避免了信道增益差异引起的BER变差问题。     

New synthetic ester type base oils with biodegradability potential

The present paper presents the results of some research into the production of synthetic ester oils of mixed structure on the basis of citric acid (2‐hydroxy‐1,2,3 propane tricarboxylic acid) with beneficial tribological properties and potential biodegradability. Two series of unsymmetrical triesters have been synthesised by varying the molar relationship between branched aliphatic alcohols from C₄ to C₁₃ along with a special alcohol of a complex aliphaticaromatic structure, namely 2‐(o‐sec‐butyl)phenoxy‐ethanol. Based on this, it has been possible to obtain products with various properties. The introduction of the aromatic function into the structure of these triesters induces interesting features, and the natural source of the citric acid holds potential for having good ecological characteristics, which are intended to be the subject of further research.     

废旧锂电池回收及应用于锌空气电池的研究进展

锂离子电池（LIBs）,目前广泛应用于便携式电子设备及电动汽车行业中。伴随着经济的高速发展,锂离子电池开始出现退役堆积现象,这导致废弃锂离子电池（SLIBs）成为世界上快速增长且数量最多的固体废物之一。废弃锂离子电池中含有较多的Li、Ni、Mn、Co和石墨等成分,为推动资源的可持续利用及对环境的保护,对废弃锂离子电池的绿色回收再利用迫在眉睫。对近年来废弃锂离子电池正极和负极材料的回收现状展开梳理,介绍了废弃锂离子电池正、负极材料的回收方法及优缺点,并详细探讨了由废弃锂离子电池正、负极材料所制备的用于锌空气电池（ZABs）正极催化剂的再构建策略。为废弃锂离子电池的可持续发展及再利用提供思路,为未来废弃锂离子电池回收领域与锌空气电池领域的结合做了展望,有助于未来更高效地回收废弃锂离子电池并拓展其在锌空气电池等领域的应用。     

急倾斜极薄矿脉削壁充填法开采采动压力监测

二道沟金矿为急倾斜极薄矿脉,采用削壁充填法与浅孔留矿法开采,随着采深的增加,发生了多起采场岩爆。为研究岩爆发生所需高应力的来源,特对开采过程进行了采动压力监测。采用巷道变形收敛监测的方法,实测了1530采场削壁充填法回采过程中,穿脉监测巷道顶底板和两帮的收敛变形。监测结果表明：随着回采高度的增加,监测巷道顶底板间距呈减小的趋势,而两帮间距则呈增大的趋势,且两帮的变形幅度比顶底板的变形要大。并根据两帮各监测点最大收敛值,绘制了采动压力特性曲线。由该曲线可知,采动压力在距上部采场上盘回采边界约7 m的范围内形成波峰,再往上盘侧则趋于平缓。对于这种比较集中的采动压力分布特点,适合采用卸压的方法对其进行控制,从而达到阻止岩爆发生所需外部高应力条件的形成。     

Biohydrogen production by Rhodobacter capsulatus Hup mutant in pilot solar tubular photobioreactor

In this study, a pilot solar tubular photobioreactor was successfully implemented for fed batch operation in outdoor conditions for photofermentative hydrogen production with Rhodobacter capsulatus (Hup⁻) mutant. The bacteria had a rapid growth with a specific growth rate of 0.052 h⁻¹ in the batch exponential phase and cell dry weight remained in the range of 1–1.5 g/L throughout the fed batch operation. The feeding strategy was to keep acetic acid concentration in the photobioreactor at the range of 20 mM by adjusting feed acetate concentration. The maximum molar productivity obtained was 0.40 mol H₂/(m³ h) and the yield obtained was 0.35 mol H₂ per mole of acetic acid fed. Evolved gas contained 95–99% hydrogen and the rest was carbon dioxide by volume.