Determination of Melamine in Candies by Triple Quadurupole Liquid Chromatography-Tandem Mass Spectrometry

本文建立了高效液相色谱串联质谱检测糖果中三聚氰胺的方法。以糖果为基质,采用三氯乙酸水溶液超声提取目标分析物,提取液经过离心、净化处理后,用强阳离子交换与反相C18混合填料色谱柱分离,乙腈和l0MMOl/l乙酸铵作为流动相(1:1),用串联质谱在多级反应监测模式下定量检测。lC-MS/MS定量限为0.01Mg/kg,线性范围为10~500μg/l,相关系数r2>0.99,平均回收率为66.8%~98.7%,相对标准偏差为1.9%~7.6%(n=6)。A method to analyze melamine residue in candies was established by using triple quadurupole liquid chromatography-tandem mass spectrometry(LC-MS/MS).Trichloroacetic acid was used to extract the target analyte.The CAPCELL PAK CR column was used for separation and the multiple reaction monitoring(MRM) positive ion mode was used for the determination.The limit of detection was 0.01mg/kg for LC-MS/MS.The coefficient of linear calibration curve was over 0.99 within the melamine concentration range of 10～500μg/L.The average recoveries of melamine by this method were 66.8%～98.7%,and the RSDs ranged from 1.9%～7.6%(n=6

Synthesis of Silicalite-1 Membranes on the Surface of Stainless Steel

Silicalite-1 (pure silica MFI) membranes were hydrothermally synthesized on pretreated surface of two common stainless steel materials, i.e., AISI 304 and 316L. XRD and SEM techniques were used to characterize the membranes. Various membrane morphologies can be obtained by adjusting synthesis conditions such as the H2O/SiO2 ratio in the start colloid, the crystallization time and temperature as well as the substrate materials. The silicalite-1 membranes on the stainless steel surface show potential applications for regenerative fuel cooling technology in high speed flight field.Silicalite-1 (pure silica MFI) membranes were hydrothermally synthesized on pretreated surface of two common stainless steel materials, i.e., AISI 304 and 316L. XRD and SEM techniques were used to characterize the membranes. Various membrane morphologies can be obtained by adjusting synthesis conditions such as the H2O/SiO2 ratio in the start colloid, the crystallization time and temperature as well as the substrate materials. The silicalite-1 membranes on the stainless steel surface show potential applications for regenerative fuel cooling technology in high speed flight field

基于地理元组的矿集区定量预测方法

本发明涉及一种基于地理元组的矿集区定量预测方法，该方法通过分析区域矿产资源时空演变过程，以GIS为平台，应用非线性理论和人工神经网络技术，集成地质、地球物理、地球化学、遥感等多元信息，对不同层次矿产地质特征和成矿地质背景进行类比，划分不同层次的成矿有利区，建立中亚区域矿产资源定量预测方法。该方法已解决现有技术无法定量预测的问题

Application of quality control circle activities to reduce the risk of defects in the intra-hospital transport of critically ill ICU patients (降低危重患者院内转运缺陷的品管圈实践)

Objective To investigate the effect of quality control circle (QCC)activities to reduce the risk of defects in the intra-hospital transport of critically ill ICU patients. Methods A QCC team was established, and factors influencing quality of the intra-hospital transport of critically ill ICU patients were analyzed. Improvement goals were set and following countermeasures were carried out to reduce the risk of defects in the intra-hospital transport. Results The rate of defects in the intra-hospital transport of critically ill ICU patients was decreased form 31. 75%beforeimplementation of QCC activities to 10. 66% after implementation of QCC activities. Conclusion The QCC activity is effective to reduce the risk of defects in the intra-hospital transport of critically ill ICU patients. It helps to regulate the management of first aid materials and modified the intra-hospital transport process. (目的 探讨品管圈在降低危重患者院内转运缺陷中的作用, 从而提高转运质量, 确保患者安全。方法 2022年8月—2023年2月成立品管圈小组, 选定“降低危重患者院内转运缺陷率”为主题, 现状调查影响院内转运质量的因素, 设定目标, 分析原因制定对策并实施。结果 危重患者院内转运缺陷率由品管圈活动实施前的31. 75%下降到实施后的10. 66%。结论 运用品管圈活动有效降低了危重患者院内转运缺陷的发生率, 有助于规范转运急救物品的管理, 完善转运流程。

地质矿产空间数据库数据质量快速系统检查方法

本发明涉及一种地质矿产空间数据库数据质量快速系统检查方法，该方法主要是针对地质矿产空间数据库内容的检查，分为空间位置准确性的检查，属性误差检查，拓扑一致性检查和图幅接边检查，在建库过程中经过多层次、多环节的质量检查与监督，确保数据库中数据准确无误