增压膨胀和全精馏无氢制氩技术在1000m~3/h空分设备上的应用

介绍采用增压膨胀和全精馏无氢制氩技术的1000m3/h空分设备的流程设计和技术指标,简述了安装调试中遇到的问题以及解决方法。     

HYSYS过程模拟软件在空分设备操作中的应用

描述了HYSYS过程模拟软件在空分设备操作中的应用,并介绍了软件应用过程中的体会。     

Two-Dimensional Simulation Model of Sediment Removal and Flow in Rectangular Sedimentation Basin

A steady, two-dimensional numerical model was created to study the hydrodynamics of a rectangular sedimentation basin under turbulent conditions. The strip integral method was used to formulate the flow equations, using a forward marching scheme for solving the governing partial differential equations of continuity, momentum, advection–diffusion, turbulent kinetic energy, and its dissipation. In this way the flow equations were converted to a set of ordinary differential equations (ODEs) in terms of the key physical parameters. These parameters, along with a set of shape functions, describe flow variables including the velocity, the concentration of suspended sediments, and both the kinetic energy and its dissipation rate. Four Gaussian distributions were investigated, one corresponding to each flow parameter. In order to calculate the turbulent shear stresses, a two-equation turbulence model (i.e., k-ε model) was used. A fourth order Runge–Kutta method numerically integrates the set of ODEs. Simulation results were compared with experimental data, and close agreement (generally within 5–10%) was observed.     

POA改进算法在梯级电站优化调度中的研究和应用

在深入分析POA传统算法优缺点的基础上，提出了POA改进算法的思想，并分析了其主要特点，同时也指出了改进算法的一些不足。以梯级电站优化调度中的短期发电量最大模型为例，给出了POA改进算法在实际工程中的优化计算结果，指出了POA改进算法的进一步应用的方向。     

已知非最小相位系统的跟踪问题研究

本文探讨了已知离散时间非最小相位系统的跟踪问题，证明了一大类针对非最小相位系统的线性控制器（其具体形式将在文中给出）不能实现对任意有界设定序列的渐近跟踪，这表明对未知离散非最小相位系统，不可能设计Ｃｌａｒｋｅ－Ｇａｗｔｈｒｏｐ型自动校正控制或自有因地制宜制品在去渐近跟踪任意有界设定序列。     

泥沙与鄱阳湖水环境

分析并讨论了鄱阳湖泥沙的来源及其对鄱阳湖水环境质量的影响。     

奥里油在火力发电厂的应用及环保处理

委内瑞拉富藏奥里油约469亿t，中国政府与委内瑞拉政府签订了合作生产并每年向中国供应650万t奥里油的合作协议。鉴于此，介绍了奥里油的特性及其在火力发电厂的应用情况，分析了燃烧奥里油发电带来的特有的环保问题和处理方法。     

GEⅢPLC在火电厂锅炉吹灰程控中的应用

介绍火电厂锅炉吹灰程控装置的系统组成和生产工艺流程,微机ＰＬＣ控制系统的硬件构成,主要功能和控制软件的设计。     

国内在役核电厂首例电气贯穿件更换改造

核电厂电气贯穿件作为安全壳上的关键设备,承担着核岛内外各种电力和信号传输以及保证安全壳压力边界完整性的重要功能。通过秦山核电厂一期工程30万千瓦机组第18次大修期间国产在役DDG-1型电气贯穿件更换改造项目的实施,分析了秦山核电厂一期工程在役电气贯穿件设备现状和改造的必要性;针对在役核电厂更换改造工期短和贯穿件密封性能验证难等问题,通过优化检验工序、制作专用检漏工装的方法,缩短了贯穿件改造的工期并验证了贯穿件密封性能。     

Betula alba Bark Extract and Empetrum nigrum Fruit Juice,a Natural Alternative to Niacinamide for Skin Barrier Benefits

The Scandinavian region is home to a unique biome with endemic plant species. The aim of this study was to explore this natural diversity and identify plant extracts providing positive skin barrier effects. Six plant extracts were identified as starting material. Following biochemical screening, two candidates outperformed the rest: Betula alba (BA) and Empetrum nigrum (EN). Quantitative PCR analysis showed that BA and EN upregulated barrier genes, when used individually and in combination. Betula alba increased AQP3 and OCLN protein expression, something niacinamide was incapable of. Additionally, the skin barrier was strengthened, evidenced by inhibition of KLK5 and hyaluronidase and showed strong antioxidant and anti-inflammatory activity through DPPH and COX2 inhibition, respectively. A first split-face clinical study was conducted using the combination of extracts versus placebo. There was a significantly better skin restructuring effect and corneocyte cohesion on the side treated with combined extracts. A second split-face clinical study assessed the combined extracts versus 3% niacinamide. Significant variations in skin hydration and TEWL were observed in favor of the extract treated side. In conclusion, we identified a natural alternative to niacinamide for improving skin barrier health, in Scandinavian plant extracts, which yield strong performance, but at a lower concentration.