Study on the performance of hydrogen isotopes permeation sensor in liquid Li–Pb

Liquid Li–Pb alloy is served as neutron multiplier, tritium breeder, and coolant in Dual Coolant Lithium–Lead (DCLL) breeding blankets. In order to monitor the tritium transport continuously and measure the tritium production rate accurately, the concentration of hydrogen isotopes in liquid breeder is an essential factor for tritium measurement. The hydrogen isotopes permeation-based capsule seems to be the most reliable sensor and is simple from the fabrication point of view. To verify the stability and repeatability of hydrogen isotopes concentration measured by permeation capsule in Li–Pb, a system based on a Nb-capsule and a quadrupole mass spectrometry was devised. The sensor would be applied to determine the variation rate of total pressure while a quadrupole mass spectrometry to measure partial pressure values of different hydrogen isotopes. The response time of the sensor is less than 100 s in liquid Li–Pb alloy and the growth rate of pressure has good repeatability in dynamic mode. Besides, calculations based on numerical simulation of the hydrogen isotopes sensor are presented.     

高速带材电磁纠偏系统开发

现有的电液伺服纠偏系统可以较好地抑制带材跑偏,但是它具有结构惯性大、相应速度慢、系统维护复杂的缺点。介绍一种新型的高速带材电磁纠偏系统,可以克服现有电液伺服纠偏系统的不足,具有广阔的应用前景。     

抗辐射菌Deinococcus radiodurans辐射抗性研究

观察了野生型抗辐射菌Ｄｅｉｎｏｃｏｃｃｕｓ ｒａｄｉｏｄｕｒａｎｓ ＫＤ８３０１及其修复缺陷突变体ＫＨ３１１１对γ射线的抗性程度,探讨了影响辐射抗性的有关因素。ＫＤ８０３１和ＫＨ３１１１经大剂量γ射线照射（０．５￣１０ｋＧｙ）,制作剂量、存活曲线;利用荧光分光光度法测定细菌的ＤＮＡ含量。结果表明,野生型的ＫＤ８０３１对射线具有显著抗性,推定的ＬＤ９０为９．５ｋＧｙ,而其突变体ＫＨ３１１１的抗性明显     

PET-PEG共聚酯性能的研究

通过共缩聚反应合成了ＰＥＴ－ＰＥＧ共聚酯,采用ＤＳＣ法测定了共聚物的结晶性能、结晶速度,还测试了共聚物的力学性能,结果表明：ＰＥＧ的加入能有效地增加分子链柔性,改善结晶性能,其中ＰＥＴ－ＰＥＧ６０００在１００℃的半结晶时间为０．７ｍｉｎ,ＰＥＧ的含量在２０％以下,拉伸性能没有恶化,冲击强度、断裂伸长率大大提高     

Introducing dislocations in ceramics by mechanical rolling: A first demonstration using SrTiO3 crystal

It has long been known that dislocations can be used to tune the functional and mechanical properties of ceramics. However, introducing dislocations with controllable networks and densities into ceramics is difficult. In this study, a mechanical rolling technique was proposed to introduce dislocations into ceramics. Using a hard SiC ball with a diameter of 5 mm as a roller, plastic zones and dislocations were successfully produced in a SrTiO₃ (STO) single crystal. The plastic zone area and dislocation densities were determined by the applied force (F) and number of rolling cycles. A force of 10 N produced a scalable plastic zone with an area of 140 µm × 5000 µm without crack formation after 100 rolling cycles. The dislocation density at the center of the plastic deformation zone can reach ∼10¹⁴ m², which is an order of magnitude higher than that achieved previously by others. Increasing the applied force increased the density of the introduced dislocations, for example, ∼2 × 10¹⁴ m⁻² under F = 30 and 35 N, however, lead to crack nucleation in the sample. The dislocations introduced significantly enhanced the mechanical properties of the STO crystal. The measured Vickers’ hardness and fracture toughness increased by 55%–60% and 23%–24%, respectively, compared to the crystal before rolling. This method can serve as a robust technique for engineering dislocations in ceramics, fulfilling the requirements of dislocation-tuned mechanical and functional investigations.     

裂解原料优化

针对中国石化扬子石化公司裂解原料的具体情况，不仅在定性上，而且利用SPYRO软件的模拟计算结果在定量上讨论了裂解原料优化的几个问题，提出了看法和建议。认为提高乙烯、丙烯等收率，应着重于裂解原料优化工作，才能有明显的效果。     

照射后小鼠组织和血清中丙二醛含量的变化

采用荧光分光光度法测定了小鼠组织和血清中丙二醛的含量变化。①3.0 Gy照射后12—24h时,丙二醛含量最高,随后逐渐下降;②不同剂量(0—4.0 Gy)照射后24h时,丙二醛含量和照射剂量呈正相关,即丙二醛的含量可很好地反映出机体的损伤情况;③Vit E对辐照后小鼠氧化损伤具有保护作用,250μg/g重体的Vit E用量是抗氧化作用的最佳用量。     

Modeling and Simulation of Moving Bed Reactor for Catalytic Naphtha Reforming

Abstract

A lumped kinetic model for catalytic naphtha reforming with 27 lumps is developed in order to predict aromatic compositions in more detail. The 8-carbon aromatics are subdivided into ethylbenzene and xylene, and 9-carbon aromatics are subdivided into trimethylbenzene, methylethylbenzene, and propylbenzene, respectively. The simulation of a Universal Oil Products (UOP) commercial continuous reforming unit is carried out to validate the model. The results show that perfect agreement of compositions at the exit of the fourth reactor is obtained between simulated values and reported values and the mass contents of benzene, toluene, ethylbenzene, xylene, trimethylbenzene, methylethylbenzene, and propylbenzene are predicted accurately. The calculated temperature at the exit of each reactor is consistent with the actual value. The composition and temperature profiles are calculated, and the two-dimensional distributions of coke content of catalyst bed are simulated.     

利用SPYRO软件优化裂解工艺

乙烯厂在没有在线色谱分析的情况下，可采取离线分析的方法，监控裂解原料的变化，判定裂解深度的高低，利用先进的模拟计算软件，优化裂解炉操作工艺，达到宏观监控与优化产品结构分布的目的。     

铸造镁合金熔炼技术进展

综述了近年来国外镁合金熔炼气体保护技术,熔炼炉设计和镁液浇注技术及装置的最新研究成果。