调味品行业现状与发展趋势分析(一)

文章综述介绍了调味品行业的总体状况、行业特点和发展趋势;从多角度对不同规模调味品企业发展的商业机遇和不同类别产品的市场拓展途径进行了探讨;提出了开发新型调味产品的几点建议.     

构皮滩发电厂技术供水系统减压阀改造应用浅析

减压阀的性能直接影响机组技术供水的品质及机组的安全稳定运行.针对以色列膜片差压式减压阀和北京时代中基ZJY46H-40C DN500型减压阀在构皮滩发电厂的应用情况,对两种类型减压阀的优缺点进行了对比分析,说明ZJY46H型减压阀在高水头电站中运用是可行的.     

麦尔兹窑煤气喷枪烧损原因分析与改进

对异常烧损的麦尔兹窑煤气喷枪,进行了金相、化学和扫描电镜检验等分析。分析结论:喷枪严重烧损主要是由于用材不当、超温运行、氧化腐蚀和硫化腐蚀所致。介绍实施的改进措施及其成效。     

基于轨迹模式空间解耦及模式能量序列的振荡分析(三)时变性分辨率从摆次细化到时间断面

系列文章的前两篇以振荡模式的空间解耦代替频域解耦,并通过互补群模式的摆次能量演化来反映复杂振荡行为的特征。由于其对时变性的分辨率较低,也不利于讨论多模式之间的交互作用,故文中提出在每个积分步末端所对应的时间断面处,按实际变量值重新冻结映象系统的非哈密顿因素,按虚构的哈密顿系统来估计该断面后的不平衡功率-转角的曲线。进而评估各互补群模式的振荡总能量(或其裕度)的时间序列,将轨迹振荡能量序列分析方法的时间分辨率从按模式摆次细化为按积分步长,更好地反映振荡的局部时变性。针对分别计及调速器或计及机械功率周期性扰动的两个算例,揭示了系统“反常”振荡行为的机理。     

Separation of Particles From Molten Aluminum With High Frequency Electromagnetic Field

The currentstudy is to investigate the separation of non-metallic inclusions from molten aluminum with 53-63kHz high frequency electromagnetic filed.In the experiments,aAl-SiC composite material-pure aluminum with a certain amount of dispersed SiC particles with 10-20μm diameter-was used.Both laboratory experiments and numerical simulation were performed.It was observed that SiC particles were pushed to the boundary layer of the aluminum close to the wall of the crucible,and the thickness of the particle layer was approximately 1.0-1.5 mm and the area fraction of the particle layer was 9-15%of the entire horizontal cross section area.With separation time going on,the accumulation layer became thinner,and the accumulation layer density became higher.The numerical simulation indicated that the magnetic flux density is larger at top and bottom than other locations and very small at the center of the crucible,and the EM force mainly acted on the outside 0.004 m layer of the melt due to the effect of the skin effect.There were recirculation eddies at the top and bottom and close to the corner where the EM force was the largest.The speed of the flow was 11-13 mm/s at the corner of the top and bottom and was as small as 1 mm/s at the center of the crucible.Both the numerical simulation and the experimental observation showed that the top free surface was not flat,approximately 1.0 mm high at the center of the top surface by numerical simulation and 4.0 mm by the experimental observation.More particles were entrapped at the lower part of the crucible.     

热致性液晶高分子材料某生产企业技术改造项目可行性分析

以投资、成本估算为基础,进行财务指标计算与盈利能力、不确定性和风险分析,确认实施上海普利特化工新材料有限公司热致性液晶高分子生产技术改造项目的必要性和经济上的可行性。     

化学发光法测定己内酰胺中的痕量铁

利用亚铁离子催化鲁米诺与溶解氧的化学发光反应,用分立取样式液相化学发光分析仪器进行痕量铁的测定,该法灵敏度高、选择性好、线性范围达三个数量级,而且操作简便、快速。     

钢筋混凝土框架结构施工技术

对多层框架结构施工过程中遇到的技术问题及解决方案进行论述,对做好类似工程的施工技术工作具有借鉴意义。     

积分定义的另一种表达方式

给出Riemann积分及Lebesgue积分定义的另一种表达方式。     

煅烧温度与保温时间对合成莫来石材料结构与性能的影响

本研究是利用铝型材厂污泥与叶腊石合成莫来石材料.主要探讨煅烧温度和保温时间对莫来石合成料中形成的晶相、微观形貌及其含量的影响;从中确定较佳的煅烧温度和保温时间.采用XRD法和SEM法表征各试样形成的晶相和显微结构;用Rietveld Quantification 法确定各试样中各晶相的含量.实验结果表明不同煅烧温度和保温时间各试样形成的主晶相都是莫来石固溶体(Al4.59Si1.41O9.7),确定较佳煅烧反应温度为1600 ℃,较佳煅烧保温时间为3 h,对应的莫来石固溶体含量为96.4wt%.