The stability of NiCoZn electrocatalyst for hydrogen evolution activity in alkaline solution during long-term electrolysis

The long-term stability of NiCoZn coating for hydrogen evolution reaction (HER) was investigated in 1 M KOH solution under 100 mA cm⁻² current density at room temperature. The effect of electrolysis on the corrosion behavior of NiCoZn coating was also studied. The alloy prepared on a copper electrode (Cu/NiCoZn) was etched in a concentrated alkaline solution (30% NaOH) to produce a porous and electrocatalytic surface suitable for use in the HER. The bulk and surface compositions of coating before and after alkaline leaching were determined by atomic absorption spectroscopy (AAS) and energy dispersive X-ray (EDX) analysis. The surface morphologies of freshly prepared and aged electrodes were investigated by scanning electron microscopy (SEM). Their catalytic activity towards the HER was assessed by recording cathodic current–potential curves and electrochemical impedance spectroscopy (EIS) techniques. It was found that the NiCoZn coating has a compact and porous structure. The long-term operation at 100 mA cm⁻² current density showed that the electrochemical activity of Cu/NiCoZn electrode increased slightly with increasing electrolysis time. The activation of electrode related to the removal of any existing corrosion products and accumulations from the pores and formation of cracks during hydrogen gas evolution. The corrosion tests showed that the corrosion resistance of Cu/NiCoZn electrode changed after electrolysis.     

水力旋流器试验工艺装置的结构设计

水力旋流器作为一种新型高效脱油设备,在油井采出液的处理方面正处于试验研究与逐步推广应用阶段.为配合室内实验工作的开展,建立了室内实验工艺新装置.该实验工艺装置具有功能多、模块化、撬装式及数据自动采集等特点.现文重点介绍了实验工艺流程的设计过程,同时简要描述了该实验装置的应用.通过对油水分离用水力旋流器样机试验,验证了该实验工艺装置设计的合理性、实用性.     

A New Primary Dew-Point Generator at TUBITAK UME

An implementation of a new low-range primary humidity generator as a part of an international collaboration between TUBITAK UME and VTT MIKES was initiated as a EURAMET Project Number 1259. The dew-point generator was designed and constructed within the scope of the cooperation between TUBITAK UME and VTT MIKES in order to extend the dew-point temperature measurement capability of Humidity Laboratory of TUBITAK UME down to ??80 °C. The system was thoroughly characterized and validated at TUBITAK UME to support the evidence for dew-point temperature uncertainties. The new generator has a capability of operating in the range of ??80 °C to +10 °C, but at the moment, it was characterized down to ??60 °C. The core of the generator system is a saturator which is fully immersed in a liquid bath. Dry air is supplied to the saturator through a temperature-controlled pre-saturator. The operation of the system is based on the single-pressure generation method with a single pass, i.e., the dew-point temperature is only controlled by the saturator temperature, and the humidity-controlled air is not returned to the system after leaving of the saturator. The metrological performance of the saturator was investigated thoroughly at both National Metrology Institutes. The pre-saturator was also tested using a thermostatic bath at VTT MIKES prior to sending them to TUBITAK UME. This paper describes the principle and design of the generator in detail. The dew-point measurement system and the corresponding uncertainty analysis of the dew-point temperature scale realized with the generator in the range from ??60 °C to 10 °C is also presented.     

自适应局部综合特征加权的单样本人脸特征提取

为了有效地提取单训练人脸样本的特征,提出了一种新的人脸局部特征描述方法,改进了局部二进制模式的方向性描述单一的问题,并且加入了像素间变化趋势幅度的描述,称之为局部综合模式(Local Comprehensive Patterns,LCP).首先对人脸样本图像进行分块,然后每个的分块子图像进行改进LCP算子运算;其次考虑到每个子块的特征对整幅人脸图像的贡献度不一致,提出了贡献度图谱(Contribution Map,CM);最后根据贡献度图谱对每个子块的改进LCP描述进行自适应加权融合形成最终的人脸描述特征,最后在ORL和Yale B库上进行了有效性的测试,与现有的多种算法进行比对,所提出的算法对于非限定环境下人脸的识别有良好的效果.     

玻璃纤维增强聚丙烯材料结晶行为研究

研究了玻璃纤维增强聚丙烯复合材料结晶情况，界面横晶的产生，横晶对材料力学性能的影响及控制方法，另外，对于玻璃纤维在该体系中对基体的结晶成核作用通过观察结晶过程，分析结晶热行为进行了研究。     

L-1型变性PVA在生产实践中的应用

介绍了高压上浆条件下采用L-1型变性PVA的浆料制备工艺及其上浆效果。     

浅谈建筑电气管线暗敷工程的施工质量管理

结合施工实践,对建筑电气管线暗敷的施工质量管理做些探讨。     

关于职称改革评聘分开问题的思考

职称改革评聘分开问题是当前职改工作在实际操作中的一个难题。本文从我国现行专业技术职务评聘制度的实际出发，分析了专业技术职务评聘分开问题中的基本矛盾，找出了当前专业技术职务评聘中的实质问题。一是人们对专业技术职务日益增长的需求和用人单位对不同职位的专业技术职务的有限需求之间的矛盾；二是现行的专业技术职务评聘制度与当前我国用人机制不匹配的问题。围绕上述问题，本文提出了两种解决问题的思路和一些想法。     

Incidence of aflatoxins,ochratoxin A,zearalenone, and deoxynivalenol in food commodities from Turkey

Aspergillus, Penicillium, Fusarium, and Alternaria species which produce toxic metabolites, create a big problem in terms of the production of reliable human food and animal feeds. This study was conducted to determine the mycotoxin contents of foodstuff collected uniformly in each year of 2017, 2018, and 2019 in Şebinkarahisar, Turkey by enzyme-linked immunosorbent assay. The highest total aflatoxin, and aflatoxin B1 were determined in red pepper in 2018 with 6.47 ± 0.07 and 4.58 ± 0.01 μg kg⁻¹, respectively while the highest ochratoxin amount was obtained again in the red paper in 2019 with 7.97 ± 0.57 μg kg⁻¹. Contrarily, the highest incidence of zearalenone and deoxynivalenol was determined in wheat and corn flour with 12.49 ± 0.3 and 397.6 ± 7.34 μg kg⁻¹, respectively. Weather changes have also been found to affect the incidence of mycotoxin. But, determined mycotoxin values do not pose a risk according to the Turkish Food Codex Contaminants Regulation.     

Corrosion Inhibition Behavior of Robinia pseudoacacia Leaves Extract as a Eco-Friendly Inhibitor on Mild Steel in Acidic Media

Metals and Materials International - The inhibition behaviour on mild steel (MS) of Robinia pseudoacacia leaves extract (RPLE) in different concentrations in 0.5 M HCl as a green corrosion...