从现代中毒学说看现代城市更新──兼谈城市基础设施更新的对策

根据现代中毒学说，首先论述了新陈代谢是现代城市发展的客观规律，然后论述了现代城市更新的重点应该是城市基础设施的更新．在此基础上，文章进一步提出了城市基础设施更新的途径与原则．     

Rapid wetting method to reduce cyanogen content of cassava flour

In 2005 a simple wetting method was developed that reduced total cyanide content of cassava flour 3–6-fold. The method involved spreading wet flour in a thin layer and standing in the shade for five hours to allow evolution of HCN gas. We found that breakdown of linamarin catalysed by linamarase to acetone cyanohydrin, followed by its spontaneous decomposition to HCN and acetone was greatly increased by standing the wet flour in the sun. Treatment for two hours in the sun gave the same amount of total cyanide remaining as five hours in the shade. This rapid treatment in the sun may be more acceptable to rural women in Democratic Republic of Congo, than five hours in the shade. The two methods are offered as alternatives for use in rural Africa. With adequate linamarase present the residual cyanogen remaining after the wetting treatment was acetone cyanohydrin.     

阳极气体杂质对PEM燃料电池性能的影响

气体中的杂质对燃料电池的毒化影响是阻碍质子交换膜燃料电池（PEMFC）商业化的主要原因之一。综述了阳极气体杂质（Co、CO2、H2S、NH3和各种碳氢化合物）对电池性能的影响,并进行了比较。研究表明,杂质对电池的影响与杂质浓度、电池温度、电流密度、毒化时间以及气体压力等因素有关。     

Response surface study of the performance of lean NOx storage catalysts as a function of reaction conditions and catalyst composition

NO_x storage and reduction (NSR) catalysts containing Pt, Ba and Fe were studied as a function of reaction conditions and catalyst composition using response surface methodology combined with high-throughput experimentation. The concentrations of the reactant gases and the reactor temperature were varied to probe their effect on catalyst performance, as quantified by lean NO_x storage and N₂O production. An empirical model relating the catalyst performance to five reaction condition variables and three metal weight loading variables has also been developed. It was found that the temperature and the concentrations of the reducing agents, i.e. carbon monoxide and ethylene, had the strongest effect on the lean NO_x storage. It was also found that the Pt and Ba weight loadings had a much greater effect than Fe weight loadings on the performance of NSR catalysts. This model provides insight about the factors controlling the NO_x conversion by NSR catalysts and also predicts the optimum catalyst composition for given reaction conditions and vice versa. As an additional study, the relationship between sulfur poisoning, nitrous oxide production, and exotherm generation was also explored.     

浅谈氨对人体的危害及防护

对磷铵生产过程中发生氨中毒的常见情况进行分析，并指出相应的有效救治措施。     

火电厂SCR脱硝催化剂中毒原因分析

SCR脱硝催化剂在某火电厂SCR脱硝装置运行30 660 h后,将新鲜催化剂活性与使用后催化剂活性进行比较,得出催化剂的活性损失值。采用SEM、BET、TG和XRF对催化剂结构特性进行表征,研究催化剂中毒原因,提出燃煤电厂催化剂运行及管理建议。     

浅析VAST4型与MMTR3型成型机的技术性能(上)

浅述了VAST4型四鼓成型机和MMTR3型成型机的结构和电气控制性能。着重描述了这2种成型机的机械结构特点、伺服控制系统、定中纠偏系统和超声波裁刀控制系统对轮胎成型工艺、设备机械特性和设备维护的影响。     

浅析VAST4型与MMTR3型成型机的技术性能(下)

浅述了VAST4型四鼓成型机和MMTR3型成型机的结构和电气控制性能。着重描述了这2种成型机的机械结构特点、伺服控制系统、定中纠偏系统和超声波裁刀控制系统对轮胎成型工艺、设备机械特性和设备维护的影响。     

表面中毒C207催化剂的曲节因子

采用N_2-CO_2气体稳态法测定了表面中毒C207催化剂的扩散通量,应用平行交联孔模型求得催化剂的曲节因子,按平均孔径计算的曲节因子δ_F:未中毒催化剂3.65,中毒催化剂2.99至3.11;按孔径分布计算的曲节因子δ:未中毒催化剂4.17,中毒催化剂3.45至3.71。     

工业V2O5-WO3/TiO2催化剂的碱土中毒研究

以某燃煤电厂应用的V₂O₅-WO₃/TiO₂蜂窝型SCR脱硝催化剂为研究对象,在实验室条件下模拟该催化剂Ca、Mg及二者复合中毒,研究了不同浓度的Ca和Mg对催化剂活性的影响,并用XRD、H₂-TPR及NH₃吸附FT-IR对催化剂进行表征。结果表明,Ca和Mg对工业SCR脱硝催化剂均具有毒性作用,其中Mg毒性相对较强,复合中毒在一定程度上弱化单组分对催化剂活性的影响;催化剂组分分散度和结晶度不受Ca和Mg的影响,但CaO和MgO的掺入抑制V₂O₅的还原能力;CaO和MgO对催化剂表面的酸性位均存在影响,尤其是B酸位,二者复合中毒对酸性位的影响小于单一组分。