提高直接空冷机组夏季出力的探讨

对直接空冷机组夏季出力受阻问题进行分析和探讨,并结合某电厂600 MW直接空冷机组运行经验和试验数据,对各项技术经济指标以及运行工况进行分析。通过解决机组真空的严密性、对散热器进行加药弱酸清洗和高压水冲洗、解决环境风对空冷凝汽器的影响、安装辅助喷雾系统,从而解决了因非设计原因造成的夏季出力受阻问题,对直接空冷机组的安全、经济运行具有参考价值。     

牛奶替代品致敏性的识别

为找到牛奶替代资源,以牛奶过敏患者血清为探针,识别牛奶及其制品过敏原,并鉴别山羊奶、水牛奶、驴奶蛋白与牛奶过敏患者血清交叉反应性。结果表明,β - 乳球蛋白和a- 酪蛋白为牛奶主要过敏原,山羊奶、驴奶总蛋白IgE 结合能力低于牛奶,二者可以作为牛奶替代资源。     

as1-酪蛋白IgE抗原决定簇的识别

以αs1- 酪蛋白氨基酸序列为模板,错位合成αs1- 酪蛋白多肽,以收集到的牛乳过敏患者血清为抗体,鉴定αs1- 酪蛋白IgE 抗原决定簇,分析影响致敏性的关键氨基酸,探讨牛乳过敏机理。结果表明：αs1- 酪蛋白IgE 抗原决定簇有5 条,它们在αs1- 酪蛋白的定位分别为aa21～35、aa26～40、aa91～105、aa141～155、aa186～200。影响αs1- 酪蛋白致敏性的关键氨基酸为组氨酸、谷氨酸、脯氨酸。说明特异性水解抗原决定簇或定点修饰过敏原氨基酸实现脱敏的方法是可行的。     

天然产物抗氧化活性评价方法研究进展

客观准确地评价天然抗氧化剂的抗氧化活性是抗氧化研究领域的热点问题,本文对近年来天然产物抗氧化活性体外评价的方法及作用机制进行综述,介绍目前常用的化学测定方法和细胞评价方法的原理及技术进展,并分析两者的区别。     

无障碍公交车内部布局设计与研究

基于人机工程学等理论知识,分析研究了残障人、老年人、儿童、孕妇等弱势人群的生理心理特征,论述了设计功能定位,进而为公交车内部设施设计规划。在此基础上通过设计公交车内部布局,为残障人、老年人、孕妇、儿童、病人,以及所有健全人提供安全、舒适的乘车环境。最后通过设计反馈信息结果,分析设计方案优劣,继而确定最终设计方案。     

P&T-GC-MS 法对食品接触硅胶奶嘴中 VMSs 的模拟迁移研究

目的建立婴幼儿食品接触喂食奶嘴中9种挥发性甲基硅氧烷(VMS)在食品模拟物中迁移量的测定方法。方法采用蒸馏水、体积分数为3%的乙酸和体积分数为50%的乙醇作为食品模拟物,利用吹扫捕集-气相色谱质谱法(PT-GC-MS)测定喂食奶嘴在40℃浸泡24 h后9种VMS单体的迁移量。结果方法学评价结果表明,该方法灵敏度高、回收率高、选择性好,能满足实际工作的要求。迁移实验结果表明,9种VMSs均被检出,3个品牌的硅胶奶嘴中的VMSs总迁移量在乙醇(50%)中最高,为2.62~11.58μg/m L。结论硅胶喂食奶嘴在使用过程中可能存在一定的VMSs迁移和食入风险,尤其在高脂类食物中风险更高。     

Challenges of land administration and Bolivian colonization: beyond technical cadastral mapping

The paper provides an overview of the dynamic process of concluding land-titling efforts started almost 30 years ago in a colonization area of Bolivia. Through the course of the cadastral mapping effort it was discovered that technological solutions cannot stand alone as the answer to land administration challenges. Findings demonstrated failings that can occur in land information systems attributed largely to an over confidence in standardization and technology as well as a lack of information or attention to detail about local land tenure characteristics, illustrating the adage that land is unique. This paper focuses on the lessons learned through public participation in the parcel mapping of 100 colonies subjected to titling and certification. Mechanisms that strengthen the tenants' role in the cadastral mapping process proved mutually beneficial to both tenants and technicians by streamlining the process. Getting initial input into the process during the information-gathering stage rather than simply submitting the results for criticism after the fact avoided duplication of efforts thus improving the efficiency of the land administration project. Efficiency is increased while empowering those most interested in the work. The lessons learned here may be exported to other cadastral mapping projects.     

游戏思维在包装数字化转型中的应用

目的 为包装数字化转型提供游戏思维设计策略。方法 在数字经济时代背景下应用游戏思维理论来拓展包装功能的边界,基于心理学自我决定论原理将包装商业价值与消费者驱动力的内核层次相结合,使用象限分析法以网络技术与电子技术为数字技术的两极,对28个案例进行分析,得到数字化包装中游戏思维属性分布区域图,建立学习类和社交类2种设计策略流程图。使用雷达图分析法得出2种策略模式与消费者驱动力的匹配关系。结论 游戏思维的数字化包装设计思路以满足用户的心理动机和本质诉求为目的,设计程序以明确的目标为导向,综合调动包装的各个构成组件并与数字技术相结合,从而推动用户行为,通过使人兴奋的目标、限制性的规则和及时的反馈形成闭环路径,有效引导消费者与包装之间的互动流程,消费者在满足个人驱动力的愉悦体验中达成了与企业的价值共创。     

Wall temperature experimental investigation in a thermally driven channel

Direct local wall temperature has been measured, in a steady state, along a vertical air channel asymmetrically heated with uniform fluxes. In the range of high Grashof numbers that was investigated, the flow regime probably remained laminar. A radiative part has been analysed with two extreme values of internal surface emissivity corresponding to unpainted metal and black painted wall. A correlation has been proposed for the calculation of a characteristic channel outlet value of the Nusselt number referred to air spacing. A local Nusselt number over the height has been developed in a power law scheme.     

CMR and related properties of single crystals of cation-deficient LaMnO3

Single crystals of LaMnO₃, La_1−xMnO₃ (x=0, 0.04, 0.1) and LaMn_1−xO₃ (x=0.1) have been grown by the floating-zone melting technique. Electrical and magnetic properties of these crystals have been examined. Only La_0.9MnO₃ crystals exhibit ferromagnetism, (T_c∼250 K), an insulator–metal transition around 250 K and CMR (58% at T_c).