巴氏杀菌对罗非鱼肉的影响

报告了罗非鱼肉组织经过Ｖｐ值为１９５ｍｉｎ的巴氏杀菌，其过氧化酶完全失活，附着的细菌细胞的全部死亡，但其失水率可达１５％左右。     

基于率失真理论的视频编码码率控制

本文以率失真理论为基础，提出了一种新的前向视频编码码率控制策略ＦＲＣ，其核心思想是：宏块目标比特数的预分配除受码率的限制外，更重要的是受到图像的局部空间活动性等因素的控制，从而达到一种最优的比特分配方案。主观测试实验结果表明，这种新的码率控制策略大大地改善了重建图像的质量。     

真空灭弧室主屏蔽罩电位静态测量分析

对中间封装式和瓷柱支撑式两种主屏蔽罩安装方式的真空灭弧室中主屏蔽罩电位进行了静态工频测试,找出了为什么中封式真空灭弧室装入整机后并不比瓷柱式真空灭弧室耐压特性优越的原因,指出在真空断路器设计中,尤其在高电压等级下,真空灭弧室的均压问题应与整机总体设计同时考虑。     

微纳米颗粒填充尼龙复合材料的摩擦学性能研究进展

综述了近年来国内外用无机纳米粒子对尼龙进行填充改性来提高其摩擦学性能的研究进展,最后指出了改性尼龙复合材料的发展前景和存在的问题。     

τ—p域AVO分析

利用柱坐标τ－ｐ变换可以实现点源地震记录的平面波分解。本文对合成理论球面波波场进行了柱坐标τ－ｐ变换，验证了该变换对真振幅恢复的准确性，该方法对实际资料进行处理的结果表明：τ－ｐ域的振幅信息可信度较高，信噪比得到了改善，在此基础上，还进行了τ－ｐ域内的振幅－射线参数关系分析，取得了令人满意的效果。     

An Iron-Decorated Carbon Aerogel for Rechargeable Flow and Flexible Zn–Air Batteries

Mechanically stable and foldable air cathodes with exceptional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities are key components of wearable metal–air batteries. Herein, a directional freeze-casting and annealing approach is reported for the construction of a 3D honeycomb nanostructured, N,P-doped carbon aerogel incorporating in situ grown FeP/Fe₂O₃ nanoparticles as the cathode in a flexible Zn–air battery (ZAB). The aqueous rechargeable Zn–air batteries assembled with this carbon aerogel exhibit a remarkable specific capacity of 648 mAh g⁻¹ at a current density of 20 mA cm⁻² with a good long-term durability, outperforming those assembled with commercial Pt/C+RuO₂ catalyst. Furthermore, such a foldable carbon aerogel with directional channels can serve as a freestanding air cathode for flexible solid-state Zn–air batteries without the use of carbon paper/cloth and additives, giving a specific capacity of 676 mAh g⁻¹ and an energy density of 517 Wh kg⁻¹ at 5 mA cm⁻² together with good cycling stability. This work offers a new strategy to design and synthesize highly effective bifunctional air cathodes to be applied in electrochemical energy devices.     

Sintering behaviors,microstructures and dielectric properties of CaO-B2O3-SiO2 glass ceramic for LTCC application with various network modifiers content

CaO-B₂O₃-SiO₂ (CBS) glass ceramic with various glass network modifiers were synthesized to develop a kind of material sintered at low temperature for multi-layer ceramic substrates. The influence of double alkali metal oxides (Na₂O and K₂O) on sintering characteristics, microstructures and dielectric properties of CBS glass ceramic were investigated. XRD analysis showed that the major crystalline phase was β-CaSiO₃ and CaB₂O₄, and the strength of the peak increased with the addition of network modifiers. DSC curve revealed that the process of crystallization and softening were obviously affected. SEM photographs exhibited that the microstructures were composed of amorphous phases, pores and crystalline phases. FTIR showed that the additives changed the continuity of CBS glass structure. An appropriate amount of Na₂O and K₂O additives could significantly improve the sintering characteristics and dielectric properties. CBS samples with 1.5 wt% (Na₂O?+?K₂O) sintered at 850 °C for 15 min presented the best performances with the bulk density of 2.53 g/cm³, ε_r?=?5.94 and tanδ?=?1.22?×?10^?3 at 10 GHz.

     

Bioinspired Electrode for the Production and Timely Separation of Nitrile and Hydrogen

Replacing electrocatalytic oxygen evolution reaction (OER) with amine oxidation reaction is adopted to boost clean and environment-friendly energy source hydrogen (H₂) in water. However, the electrocatalytic reaction is severely restricted by the strong adsorption of product on the catalyst surface. Inspired by the cooperation of flavin adenine dinucleotide and mitochondria membrane in biological system, the catalysis-separation complex electrodes are introduced to promote the desorption of product and hinder its readsorption by applying polytetrafluoroethylene (PTFE)-separation membrane on the one side of electrode, which is benefit for the cleanness of active sites on the catalyst surface for the continuous production and timely separation of nitrile and hydrogen. With the intermolecular force between PTFE and nitrile, the nitrile droplets can be quickly desorbed and separated from catalyst surface of anode, and the size of nitrile droplets on the catalyst surface is only 0.23% to that without PTFE. As a result, the current at 1.49 V_RHE from the catalyst with PTFE membrane is about 33 times to that of catalyst without PTFE after long-term operation. Moreover, the cathode with PTFE membrane also achieves the rapid desorption of H₂ bubbles and stable cathodic current because of the strong absorption of PTFE to H₂.     

Effect of oxidation on fracture toughness of a carbon/carbon composite

The fracture toughness of a carbon/carbon composites oxidized at different temperature for 1 h was measured. The fracture surfaces were examined by scanning electron microscopy (SEM). The results indicate that oxidation temperature has significant effects on the fracture toughness. Fracture toughness decreases with the increase of the weight loss. The SEM images reveal that the decrease of fracture toughness was mainly attributed to the oxidation of the interface in the composite.     

深圳市公交车行驶工况研究

车辆在特定道路工况条件下的性能能够为汽车系统的设计和改进提供参考。目前,深圳市还没有建立起典型的城市道路工况。文章基于深圳市M347路公交车的行驶数据,利用主成分分析法和聚类分析法来构建公交车线路行驶工况。由聚类分析将原始短行程数据分为两类,可以体现公交线路中拥挤和畅通两种不同行驶状况。文章所构建的综合工况能较好地反映该线路的道路工况,对于研究分析具有深圳特点的行驶工况和优化车辆性能具有一定参考意义。