Monitoring initial pitting behaviors of 30CrMnSi steel in NaHCO3-NaCl solution by ESPI and electrochemical noise

The initial pitting behaviors of 30CrMnSi steel in 0.05 mol/L NaCl + 0.5 mol/L NaHCO₃ solution was studied using electric speckle pattern interferometery (ESPI) and electrochemical noise (EN). Results show that the bright speckles and sharp fluctuation of electrochemical signals occurred at the same time. The EN curve shows that there are three stages during the pitting process — the induction stage (0–50 s), the incubation stage (50–300 s) and the initiative stage (300–512 s).     

CBTC中安全通信协议的设计与仿真研究

依据欧洲标准EN50159设计一种用于CBTC各子系统间通信的安全通信协议.该协议面向连接,采用序列号、超时检测、安全编码等多种安全措施,在通信异常发生时,具备故障导向安全能力.借助OPNET仿真环境对协议的实时性进行分析.仿真结果表明,通过在仿真中注入链路故障协议验证故障导向安全功能,该协议能够满足CBTC系统的应用需求.     

对欧盟标准EN 13445基于应力分类法分析设计的理解——兼谈和ASME Ⅷ-2的区别和联系

对欧盟标准EN13445“第三部分：设计”附录C基于应力分类的分析设计方法以及18款详细的疲劳评定做出分析和理解，并对ASMEⅧ-2的应力分析设计、疲劳设计的有关内容进行比较和讨论。     

Ergebnisse der RLT‐Filterprüfung nach EN779 im Vergleich zu Messungen an Filtern aus dem Betrieb

Filters used for building general ventilation are tested since more than 20 years, and there is always a heavy discussion about the usability of test data under lab conditions. New is the introduction of a minimum efficiency (EN779; draft). In this study filters are mounted in the ventilation system for 3 and 6 month. Afterwards fractional efficiencies are measured with a DEHS aerosol in a test rig. In addition tests are performed using diesel soot as loading aerosol or isopropanol to reduce the electrostatic charge on the synthetic fibers. The results show a strong influence of the efficiency on the test procedure and very loosely agreement of these results with those using ASHRAE dust.     

新席夫碱萃取剂（HPMαFP）_2EN的合成及其在反相纸色谱中应用的研究

合成了新席夫碱萃取剂Ｎ，Ｎ’－双［（１－苯基－３－甲基－５－氧－４－吡唑啉基）α－呋喃次甲基］乙二亚胺［（ＨＰＭａＦＰ）_２ＥＮ］。通过元素分析、红外光谱、核磁共振谱、质谱和紫外光谱研究，确定了其结构及有关性质。以这种萃取剂为固定相并采用反相纸层析色谱法首次研究了试剂对稀土离子的分离性能。试剂在ｐＨＯ．２～１．２时，可实现某些多组分混合稀土离子体系的分离。     

坐便器用水量测试方法的比较

坐便器用水量是重要的检测指标,各国标准的测试方法有一些差异,而不同的测试方法对测试结果有一定的影响。在此比较了坐便器用水量测试的中国标准(GB 6952-2005)、美国/加拿大标准(ASME A112.19.2-2008/CSA B45.1-08)、欧盟标准(EN 997:2003/A1:2006)、澳大利亚标准(AS 1172.2-1999)四个标准。通过对相同样品的4种测试方法试验,得出了测试结果之间的差异性。结果表明,ASME/CSA方法的用水量(大冲和小冲)和GB方法基本一致,EN方法的用水量(大冲和小冲)比ASME/CSA和GB方法的小,AS方法的平均用水量最小。