2017年泸州市195份食品中化学污染物及有害因素检测结果分析

目的 了解泸州市食品中主要化学污染物及有害因素的污染水平和趋势, 分析食品安全风险隐患并确定危害因素的分布和可能来源。方法 根据2017年四川省食品安全风险监测项目要求, 从泸州市各食品 流通环节购买食品样品, 按照《食品卫生检验方法》、《食品安全国家标准》和《2017年国家食品污染和有害因素风险监测工作手册》和《食品中化学污染物及有害因素监测技术工作手册》的相关检测方法对农药、兽药、非食用物质、元素、食品添加剂、禁用药物、食品加工贮藏过程产生的污染物、生物毒素等19大类94个项目进行检测, 检测结果依据GB 2761-2017、GB 2762-2017和GB 2763-2014等相关标准进行评价。 结果 共检测食品类样品195份, 其中189份合格, 合格率为96.92%。不合格率最高的食品为水发产品, 有4个样品中甲醛超标; 谷物及其制品(小麦)有2个样品中玉米赤霉烯酮(zearalenone, ZEN)超标。结论 泸州市2017年195份食品样品中化学污染物及有害因素检测指标合格率较高, 但个别食品仍存在较高的安全风险, 应采取针对性措施进一步继续加强重点环节监管, 确保我市食品安全。     

麻辣鯷鱼休闲食品的研制

近年来鯷鱼产量逐渐上升,主要用于生产鱼粉,经济价值极低。该文研究了鯷鱼的脱盐工艺和调味工艺,探讨了液料比、温度对脱盐效果的影响,结果表明液料比4︰1,水温45℃,脱盐40 min为最佳脱盐工艺;鯷鱼干调味煮制时间为60 min;正交试验优化的最佳主料配方为:辣椒粉15 g,花椒粉4 g,食盐4 g,白砂糖60 g。以上述工艺加工生产的麻辣鯷鱼休闲食品口味和外形均较好,市场前景广阔,对于提高鯷鱼经济价值,促进我国水产品加工产业健康发展具有一定借鉴意义。     

2016—2018年某市疾控中心实验室质量管理体系不符合项分析

目的 汇总分析某市疾控中心实验室2016-2018年发现的不符合项，提出改进建议。方法 根据2016-2018年质量管理活动相关资料，对不符合项的来源、类别、频次和分布情况等进行统计分析。结果 2016-2018年共发现不符合项126项，均为一般不符合，类型以实施性为主，主要来源于日常监督及内、外部审核，主要涉及记录控制、人员能力确认和监督、管理体系文件和执行、设备和设施管理等要素，主要分布在卫生科、理化检验科、质管科等科室。结论 某市疾控中心质量管理体系3年来运行良好，不符合项呈减少趋势，但在强化质量和责任意识、完善奖惩机制和信息化建设等方面仍亟待加强。     

泸州桂圆果肉中微量元素含量分析

目的确定泸州产桂圆肉中微量元素的含量。方法采用微波消解,电感耦合等离子体光谱质谱联用仪和电感耦合等离子体光谱仪对桂圆肉中16种微量元素进行检测。结果泸州本地产桂圆肉中钾平均含量高达20 g/kg;其次是钙和镁,平均约为600 mg/kg;钠的平均含量约40 mg/kg;铁、硼、铜、锌、含量均大于10 mg/kg、锰的含量约为5 mg/kg。同时含有微量的镍、钼、钴、硒、铬、锡;在方法检出限范围内,未检测到钒。结论泸州桂圆中含有人体必需的微量元素,同时含有丰富的钾、钙、镁。     

Electroluminescence in conjugated polymers: excited states in cyano-derivatives of poly(p-phenylenevinylene)

Processible conjugated polymers can be used to fabricate a range of thin-film diodes which can be designed to show good characteristics both as electroluminescent diodes and as photoconductive diodes. We highlight the improvement to the electroluminescence efficiency that can be produced by the use of two polymer layers selected so that the heterojunction between the two layers is able to confine charge and, thus, bring about electron-hole capture to generate excitons at this interface. We present results on the photophysical properties of the cyanosubstituted poly(phenylenevinylene)s which provide electron transport layers if these heterostructure devices; we find evidence for strong interchain interactions (excimer formation) for the neutral excited states in these polymers, with strong red shifts of the luminescence, though preserving high photoluminescence efficiencies.     

Multi-objective optimization and exergoeconomic analysis of a multi-generation system based on biogas-steam reforming

In the current work, a new design of a multi-generation integrated energy system powered by biogas energy is proposed, assessed, and optimized. To scrutinize the workability of the offered system, energy, exergy, exergo-economic, and economic investigations have been applied as robust tools to the evaluation of the system. Moreover, to boost the rate of hydrogen production rate, the steam reforming method and purification process are integrated into the systems. It is found that the designed multi-generation integrated energy system is able to generate 108.7 kW, 888.7 kW, and 703.3 kg/h, power, cooling load, and hydrogen, sequentially. Besides, it is determined that the energy and exergy efficiencies of the system are about 31.51% and 31.14%, sequentially. Furthermore, a comprehensive parametric evaluation is employed to appraise the influences of key variables on the operation of the system and relying on its achieved outcomes, two different optimization styles are established. From the optimization outcomes, it is remarked that in the multi-objective optimization mode, a TCOP of 16.23 S/GJ and a net power of 158.21 KW, are achievable.