蓄热式热氧化炉固态二次污染物成分分析及形成机理初探

以制药工业企业三床式蓄热式热氧化炉（Regenerative Thermal Oxidizer, RTO）处理VOCs废气工程实例为研究对象,对RTO底部固态二次污染物的主要成分进行了分析,推断了固态二次污染物可能的形成机理,提出了预防性措施。结果表明：该固态二次污染物主要成分为含水率2.87%、三乙胺盐酸盐含量93.37%,邻苯二甲酸含量2.35%,其他1.41%;基于成分分析,推断固态二次污染物（三乙胺盐酸盐）的形成机理可能是由于未参与燃烧反应的三乙胺与含氯有机物经过高温焚烧产生的HCl在进出气室内相遇混合而成;基于固态二次污染物形成机理,提出了对含氯有机物单独收集处理或者采用四床式RTO等预防性措施。     

甲状腺肿机制在会成蛋白质时Zn/Ca失调抑制I~-向I~0转化的研究

虽然碘缺乏假说一直被认为是导致甲状腺肿的病因,但实质并不清楚。本文根据中外文献资料、多学科交叉理论,结合江苏省苏南西部地区地甲病与环境地质条件关系综合研究,论述了碘元素在自然环境中分布差异取决于是否有适宜微生物生长繁殖的环境,碘元素靠生物吸收聚积,碘流失理论无法解释。人体甲状腺缺碘,并非环境缺碘,甲状腺肿机制在合成蛋白质时Zn／Ca失调．摄入体内Ca含量高,合成Ca蛋白质高,阻碍Zn元素合成Zn蛋白质,Zn蛋白质合成的醉不足,摄入的无机碘（I-）不能被酶活化为分子砍（Io）合成甲状腺素,而经细胞外──肾系统排出体外,导致恩者尿中高I-、Ca2+,而甲状腺内缺碘的反常病理生化特征。     

巴盟乌拉特后旗地方性甲状腺肿患病率调查及防治

对乌拉特后旗１４９１０名居民进行了地方性甲状腺肿患病率调查，患病率为５．９４％，属于轻病区。地方性甲状腺肿的患病率在性别和年龄间均存在着显著性差异，男性患病的高峰年龄是１０岁，女性患病的高峰年龄是１５岁－和３０岁－。甲状腺肿大的类型主为弥漫型，占９０．７４％。对患者口服磺化钾治疗，总有效率为９０．９１％。     

河南省地甲病、克山病、大骨节病病区不同人群发硒含量及全血GSH-Px活性的对比分析

测定了河南省地甲病、克山病、大骨病病区不同人群发硒含量及GSH－Px活性，并作了对比分析，结果表明，对照组人群发硒含量及GSH－Px活力显著高于地甲病、克山病及大骨节病区，病区之间无显著性差异。     

轻、重稀土对球墨铸铁抗衰退性能的影响

系统地研究了不同稀土含量对钇基重稀土镁球铁和铈基轻稀土镁球铁抗衰退性能的影响，得到了各种球化剂处理的铁水球化级别随保持时间的变化关系曲线。结果表明：无论Y-Mg-Si球化剂还是Ce-Mg-Si球化剂处理的铁水，随着稀土残量的增加抗衰退时间都延长，但当铁水中的稀土残量达到一定值后，初始球化级别下降；无论Y-Mg-Si球化剂还是Ce-Mg-si球化剂，稀土中等残量(0．04％-0．06％)条件下的抗衰退性能都最好，此时残镁量在0．04％-0．07％；中等稀土残量的稀土镁球化剂的抗衰退性能显著优于镁硅球化剂，而且Y-Mg．si球化剂的抗衰退性能优于Ce-Mg-Si球化剂，Ce-Mg-Si球化剂在一定条件下同样可以用于大断面球墨铸铁件的生产。     

87例逆行胰胆管造影失败原因分析

总结分析了87例逆行胰胆管造影检查失败原因，其中解剖走形异常、溃疡及炎性狭窄或出血、食道静脉曲线失败25例；乳头位位置异常、乳头充血、肿胀或增生样改变及十二指肠憩室缘内乳头而失败45例；毕氏Ⅱ式术后胃检查失败2例；护理因素、病人不合作或不能忍受失败5例。结合有关文献，探讨了逆行胰胆管造影检查术失败的原因及提高成功率的方法及注意事项，以提高检查成功率。     

微小型甲状腺癌手术治疗的临床效果体会

目的探讨微小型甲状腺癌手术治疗的临床效果体会。方法将2014年3月—2015年3月在广州市番禺区中心医院肿瘤科治疗的70例微小型甲状腺癌患者随机分为两组,对照组采用开放性手术治疗,观察组采用内镜手术治疗,比较两组患者的治疗效果、术中各项指标、并发症发生率。结果两组患者治疗有效率无明显差异(P0.05);观察组手术时间、术中出血量、切口长度、住院时间与对照组相比,均有明显差异(P0.05);观察组术后切口感染、低钙抽搐、呼吸困难、喉返神经损伤等并发症发生率明显低于对照组,差异有统计学意义(P0.05)。结论微小型甲状腺癌采用内镜手术治疗效果更佳,利于患者的术后恢复,并发症的发生率也更低,具有积极的临床意义。     

Considerations on the Thermal Behaviour and Oxidation Resistance of Cast Iron

Thermal analysis was used to characterize the thermal behaviour and oxidation resistance of some nodular cast irons. Samples of nodular cast iron in various stages of elaboration, with different chemical compositions, were studied. The samples were heated in air, in the temperature range 291-1273 K, and the thermal (TG, DTG and DTA) curves were recorded. A group of samples with low silicon content exhibit similar behaviour: a continuous increase in mass and an exothermic effect up to 1123 K. The thermal effects correspond to iron oxide (Fe3O4, FeO, Fe2O3) formation. At high temperatures (T>1123 K), there is a decrease in mass and an endothermic effect. A decrease in the superficial carbon content by combustion (‘decarburization’ effect) occurs in the range of high temperatures. The two effects of oxidation and decarburization depend on the structural changes which occur in cast iron at high temperatures. The decarburization process was modelled and the kinetic parameters were determined (reaction order n=0.76; activation energy E=141 kJ mol-1; pre-exponential factor A=2·102s-1). The oxidation process was studied by non-isothermal methods with regard to two mechanisms: two-dimensional transport for low temperatures, and three-dimensional transport through a sphere for high temperatures. The activation energies were calculated: 68 kJ mol-1 for low temperatures and 122 kJ mol-1 for high temperatures. This revised version was published online in July 2006 with corrections to the Cover Date.     

高分子化学线型缩聚反应数均聚合度计算的教学体验和改进

对高分子化学课程本科教学中有关线型缩聚反应数均聚合度的计算,以及聚合度与官能团过量之间的定性及定量关系进行了讨论。针对现有教学方法易引发学生误解和混淆的情况,定义了新的参数和发展了相应改进的计算方程。新的计算方程的计算过程清晰、参数定义明确、易于学生理解掌握,在实践中取得了良好的教学效果。     

The first total synthesis of SB87-Cl and pestalone, novel bioactive benzophenone natural products

SB87-Cl 1, an inhibitor of testosterone-5α-reductase, and pestalone 2 exhibiting effective antimicrobial activity against MRSA (MIC = 37 ng/mL) and VRE (MIC = 78 ng/mL), were novel bioactive benzophenone natural products. Total synthesis of 1 and 2 has been successfully accomplished. The common synthetic precursor 18 of 1 and 2, was successfully obtained by the coupling of 8 with 12.     

The determination and application of 87Sr/86Sr ratio in verifying geographical origin of wheat

As ⁸⁷Sr/⁸⁶Sr ratio plays a significant role in authenticating the geographical origin of foodstuff, it is important to identify where the ⁸⁷Sr/⁸⁶Sr signature in food comes from, and the methods of ⁸⁷Sr/⁸⁶Sr ratio analysis in food and environmental samples. Wheat with three genotypes, soil and groundwater samples were collected from three regions of China during harvest time of 2014. The ⁸⁷Sr/⁸⁶Sr ratios in the samples were determined by thermal ionization mass spectrometer in order to investigate the possible source of ⁸⁷Sr/⁸⁶Sr in wheat, and the concentrations of Rb and Sr in wheat and soils were also detected by inductively coupled plasma mass spectrometry and combined with ⁸⁷Sr/⁸⁶Sr ratio in order to trace the geographical origin of wheat. The ⁸⁷Sr/⁸⁶Sr ratio, the contents Rb and Sr, and Rb/Sr ratio of wheat and soil samples showed significant differences among three regions. The ⁸⁷Sr/⁸⁶Sr ratios and the concentrations of Rb and Sr in soils were higher than those in corresponding wheat. The ⁸⁷Sr/⁸⁶Sr ratio in wheat was identical to that corresponding soil NH₄NO₃ extracts (labile fraction of soil) and groundwater. Wheat uptake more Rb than Sr. 3D distribution of ⁸⁷Sr/⁸⁶Sr, Rb and Sr could identify wheat samples from different regions clearly. The ⁸⁷Sr/⁸⁶Sr ratio of wheat reflects the ⁸⁷Sr/⁸⁶Sr ratio of the associated environment including soil and groundwater. It is expected that the use the parameters of ⁸⁷Sr/⁸⁶Sr ratio, the contents of Rb and Sr will allow to trace geographical origin of wheat. Copyright © 2017 John Wiley & Sons, Ltd.