GB18401新老标准的比较

介绍了GB 18401-2010与GB 18401-2003的主要差异,并探讨新标准的实施对纺织服装成品pH值测试可能带来的影响。     

Effect of S on H-induced grain-boundary embrittlement in γ-Fe by first-principles calculations

The effect of interstitial impurities (H and S) on the atomic, electronic structure, and mechanical properties of the γ-Fe Σ5 (021) grain boundary (GB) was investigated via first-principles calculations. H atoms act as an intergranular embrittler in the Σ5 GB due to a reduction in the charge density between the Fe atoms connected to the grains, whereas H and S co-segregation produces more pronounced embrittlement behavior, resulting in intergranular fracture. The S-induced embrittlement plays a crucial role in the H and S segregation, due to a combination of the structural and chemical effects. The fracturing of Σ5 GB due to S and H segregation is a two-step process. The first step is the breaking of Fe–Fe bonds in the GB, followed by the breaking of the remaining Fe–S bonds in the second step, resulting in the complete separation of the two grains. Moreover, the S atom can slightly compensate for the embrittlement induced by H, because some of the Fe atoms that obtain electrons from the S atoms can provide more electrons to the H atoms, and thus, they can compensate for the electrons that must be acquired from other Fe atoms. We call this “the electrons compensating effect” and this effect is helpful in the design and alloying of steels that are resistant to H embrittlement.     

In-situ observation of interaction between precipitates and austenite during δ→γ phase transformations

The δ-ferrite to γ-austenite phase transformation in duplex stainless steels was observed using ultra high-temperature confocal laser scanning microscope, and the orientation relationship between the γ phase, and precipitate is discussed. Owing to mutual promotion action, the γ phase was observed at δ/δ grain boundary at the beginning of δ-ferrite→γ-austenite transformation, followed by two-dimensional γ-phase growth at the same speed (0.625?µm?s^?1) along the grain boundary and into the δ grain matrix. The γ-phase growth rate decreases to 0.244?µm?s^?1 when precipitate stops growing. In the process of grain growth at high temperature, the precipitated pinning grain boundary will slow the movement speed of the grain boundary.

The mutual promotion action leads to preferential nucleation of the γ phase, and the nucleation and growth of the austenite also promoting the growth of MnS the growth.     

GB/T3216-2005回转动力泵性能判定法的公式化研究

探讨了ISO9906和GB/T3216—2005标准中有关流量、扬程和效率值以及NPSHR的判定问题。分析了标准中性能满足的保证条件，分别提出了流量、扬程和效率值以及NPSHR的判定的数学表达式，比较了新、旧的判别方法。     

机顶盒HDMI电磁兼容性设计改进

Song Wenping     

学术论文应重视文后参考文献的著录

参考文献是学术论文的重要组成部分,正确著录文后参考文献对读者、作者和论文的编辑出版单位都有非常重要的意义。但是,国内学术论文对参考文献重视不够,表现在篇均参考文献数量偏少,引文时效较长;所引文献不符合文后参考文献著录原则和规范等方面。提高学术论文参考文献著录的准确度要求编辑要加强自身的学习,提高引文意识;通过编辑引导作者,加强审稿专家把关参考文献环节,以标准化作为期刊评比的环节之一。     

关于GB 8076-1997《混凝土外加剂》标准修订的几点建议

对GB 8076-1997、JC 473-2001和JC474-1999标准进行了分析,并就几个标准的合并、增加外加剂品种、在新标准中考虑对有些试验项目指标和试验方法中的规定进行修订,提出了相应的建议.     

Use of the nuclear reaction for diagnostics of energetic particles in burning plasmas

Application of reaction-produced γ-rays to diagnostics of energetic particles in burning plasmas is analyzed. Particularly, we focus on 0.981 MeV γ-rays emitted in the GB7-7-KB/0?wchp=dGLzVtb-zSkWz" alt="View the MathML source" title="View the MathML source" align="absbottom" border="0" height=19 width="90"/> nuclear reaction solely governed in the plasmas by energetic tritons. It is shown that these γ quanta can serve as a promising tool to diagnose α knock-on tritons and α-particles confined in burning DT plasmas. Key parameters of the α knock-on triton population and the α-particle confinement property can be obtained by comparing the experimental γ-ray yield and spectrum with theoretical slowing-down calculations. Even if the γ-ray spectral shape cannot be acquired, one can monitor densities of these tritons and α-particles at energies of 0.6–1.8 MeV and 2.0–3.5 MeV, respectively, in a nearly steady-state plasma. The 0.981-MeV photons also would help to display time evolution of the α-particle population in experiments of deuterium plasmas with pulsed tritium beam shots.     

高效有机硫脱除溶剂研发及性能考察

针对GB 17820-2018《天然气》对商品气中总硫含量的严格要求,通过室内实验,对多种类型的有机硫脱除溶剂配方进行评价,筛选出一种具有较高有机硫脱除性能和一定脱硫选择性的物理-化学溶剂。考察了气液体积比、吸收压力及填料高度等工艺条件对该溶剂吸收性能的影响,同时也考察了再生温度、闪蒸气量和溶液性能稳定性等关键指标,明确了碳硫比对选择性的影响。在原料气中CH 3SH和COS质量浓度均为30 mg/m^3且碳硫比大于5.0的条件下,新溶剂有机硫脱除率最高可达86.87%,CO 2脱除率为76.42%,可更好地保障商品气中总硫指标,并降低商品气量损失。     

中欧火电厂烟气排放规定对比研究

欧盟指令DIRECTIVE 2010/75/EU在国际社会上的认知度较高,文章从适用对象、机组大小划分、燃料类别、标准状态与基准氧含量规定、污染物项目、烟气排放限值、最低脱硫效率等方面,对2010/75/EU指令与中国《火电厂大气污染物排放标准》（GB13223—2011）进行了对比研究,主要结论如下：欧盟污染物控制项目包括SO2、NOx、烟尘和CO,对汞的排放未作要求;燃料及机组类型的划分欧盟较中国细化;欧盟脱硫装置有最低脱硫效率的性能考核;在共有的污染物项目中,中欧排放限值不相上下,某些排放限值中国甚至比欧盟更为严格。