Tritium concentrations in precipitation in Shanghai

Tritium concentrations in precipitation can be used as a criterion to evaluate the tritium baseline of the environment. The tritium concentration in precipitation in Shanghai during 2014-2015 was determined. Values ranged from 0.68 ± 0.04 to 4.11 ± 0.39 Bq/L, and it showed a decreasing trend compared with historical data; however,the values were slightly higher than the natural background tritium level. Additionally, the tritium concentration shows a seasonal variation: It was higher in autumn and winter and lower in summer and spring. A comparison of concentrations in precipitation in Shanghai and around the Qinshan Nuclear Power Plant reveals no correlation,implying that the nuclear power plant operations may not affect the environment of Shanghai. Thus, the raised tritium concentrations in Shanghai might be due to the effects of monsoons, spring leak, raindrop, or other activities that generate tritium there. Those activities may include chemistry research that uses tritium as a tracer.     

浅谈牛皮糖的质量控制

浅谈牛皮糖的质量控制戴正海扬州市食品科学研究所２２５００２牛皮糖是以淀粉、砂糖、淀粉糖浆等原料经高温熬制成糖体,外层再附以芝麻仁加工成的。具有甜度低,富有弹性,咀嚼感强,香味浓郁,营养丰富等优点,是目前市场上颇受消费者欢迎的一种糖果。在生产过程中,应...     

发电厂信息化规划设计研究

本文简述了发电厂信息化规划的设计研究思路,介绍了发电企业的工作流程,阐述了数字化电厂以及信息系统总体框架,提出了信息化建设的指导思想和总体目标,重点描述了应用系统建设目标、实施策略、项目组织管理,并落实到浙江省十多个新建电厂的信息化建设与实施中。     

Tritium concentrations in precipitation in Shanghai

Beamline BL17 U1 at Shanghai Synchrotron Radiation Facility is an energy-tunable macromolecular crystallography beamline that has been in user operation since 2009. Growing demand from the user community for a small beam and related experimental methods have motivated upgrades of the devices in the endstation.Minibeam modes have already been developed for operation. A self-integrated diffractometer reduces the sphere of confusion of the rotatory axis to 1μm. The new diffractometer is equipped with an upgraded on-axis viewing system that can improve the resolving power. Additionally,the area detector was also upgraded to the newest generation of detectors, the EIGER X 16 M, which can collect data at 133 Hz. After these upgrades, the endstation became virtually new. This paper covers the upgrade of the endstation devices and gives the first data collection results.     

Precipitation Behavior and Microstructural Evolution of Ferritic Ti–V–Mo Complex Microalloyed Steel

Precipitation behavior of(Ti,V,Mo)C and microstructural evolution of the ferritic Ti–V–Mo complex microalloyed steel were investigated through changing coiling temperature(CT).It is demonstrated that the strength of the Ti–V–Mo microalloyed steel can be ascribed to the combination of grain refinement hardening and precipitation hardening.The variation of hardness(from 318 to 415 HV,then to 327 HV) with CT(from 500 to 600–625 °C,then to 700 °C) was attributed to the changes of volume fraction and particle size of(Ti,V,Mo)C precipitates.The optimum CT was considered as 600–625 °C,at which the maximum hardness value(415 HV) can be obtained.It was found that the atomic ratios of Ti,V and Mo in(Ti,V,Mo)C carbides were changed as the CT increased.The precipitates with the size of \ 10 nm were the V-rich particles at higher CT of 600 and 650 °C,while the Ti-rich particles were observed at lower CT of 500 and 550 °C.Theoretical calculations indicated that the maximum nucleation rate of(Ti,V,Mo)C in ferrite matrix occurred around 630 °C,which was consistent with the 625 °C obtained from experiment results.     

衡阳市大气颗粒物中~(210)Po的活度-粒径分布测量

利用大流量撞击式分级采样器、放化分离提纯技术和α谱仪测量技术,建立了针对大气颗粒物中210Po的活度及活度-粒径分布的测量方法,并应用该方法分别于春季和秋季对衡阳市城区大气颗粒物中210Po的活度及活度-粒径分布进行了测量。实验测量结果表明,衡阳市城区大气颗粒物中210Po的含量处于正常水平;总体积比活度和质量比活度的分布范围分别为:0.012 5 m Bq·m-3~1.165 8m Bq·m-3、0.459 7 Bq·g-1~13.859 8 Bq·g-1,体积比活度含量占TSP中总含量93%的210Po存在于粒径范围小于3.0μm(PM3.0)的颗粒物中;雾霾天气会提高公众所接受的天然内照射剂量;同时发现雨水对大气颗粒物中210Po的净化作用较为明显。     

黑菊芋结合酚的提取及其抗氧化活性研究

目的 建立黑菊芋结合态多酚的较优提取工艺,评价其抗氧化活性.方法 采用碱水解结合乙酸乙酯萃取法,以液料比、氢氧化钠水解温度和水解时间为单因素,结合态多酚提取率作为考察指标,采用响应面法优化黑菊芋结合酚的提取工艺;采用福林酚法检测黑菊芋中游离酚和结合酚的含量,并评价其体外抗氧化活性.结果 黑菊芋结合酚的最优提取条件为液料...     

A Non-monotone Line Search Algorithm for?Unconstrained Optimization

The monotone line search schemes have been extensively used in the iterative methods for solving various optimization problems. It is well known that the non-monotone line search technique can improve the likelihood of finding a global optimal solution and the numerical performance of the methods, especially for some difficult nonlinear problems. The traditional non-monotone line search approach requires that a maximum of recent function values decreases. In this paper, we propose a new line search scheme which requires that a convex combination of recent function values decreases. We apply the new line search technique to solve unconstrained optimization problems, and show the proposed algorithm possesses global convergence and R-linear convergence under suitable assumptions. We also report the numerical results of the proposed algorithm for solving almost all the unconstrained testing problems given in CUTEr, and give numerical comparisons of the proposed algorithm with two famous non-monotone methods.     

CSP中间包夹杂物去除效果的试验研究

 夹杂物对钢的性能有很大影响,尤其是对钢水纯净度要求较高的硅钢,因此在硅钢生产过程要采取措施严格控制夹杂物的含量。本文研究了马钢薄板坯连铸连轧生产硅钢时中间包内夹杂物的种类、含量及粒度组成等,分析中间包内夹杂物的分布,从而评价中间包去除夹杂物的能力。试验结果表明：改造优化以后的中间包基本能够去除>40m的大型夹杂物,也为<30m的小型夹杂物提供了聚集、长大的动力学条件,中间包去除夹杂物的能力较强,为生产高品质的硅钢提供了有力保障。     

花生酥的生产技术

<正>花生酥是以白砂糖、饴糖和花生仁为主要原料,熬煮后经多次机压而成的一种传统产品.甜度低,口感酥松,营养丰富,具有香、酥、松、脆等特点,深受消费者欢迎.花生酥的糖体是由白砂糖、饴糖和起酥油经熬煮而成.熬煮的过程是砂糖由有序的结晶