几种碳酸钙对给水用硬PVC管材性能的影响

研究几种PVC常用的碳酸钙物理形貌及其对给水用硬PVC管材性能的影响。研究证明重钙在PVC颗粒上的吸附能力较轻钙差,轻钙颗粒越细,越易被PVC颗粒吸附,干混料的流动性越好;几种碳酸钙中,使用纳米钙的给水用硬PVC管材的冲击强度最高,重钙的最低;加不同碳酸钙的给水用硬PVC管材的密度和维卡软化温度相近。     

Chemical Effects of Radiation Emitted from 10B(n, γ)7Li Reaction on Mixture of n-Propylamine and n-Propanol

The long term variation of the mean dose due to natural radiation in Japan received by an individual person was investigated. The mean exposure rate in each prefecture obtained by in-situ measurements was adopted as a basis of the radiation level. Population data were taken from both the resident registration and the census taking into account the essential difference of their meanings. It was revealed that the per capita dose due to outdoor natural radiaiton in Japan has been decreasing in the last approximate 30 yr. It will be due to the population movement from countrysides towards urban areas. That is because countrysides generally consist of stable mountainlands where granitic rocks distribute though urban areas generally consist of alluvial plains where volcanic ash or humus dominates. Although the contribution of low radiation level (below 9.0μR/h) areas to the nation-wide collective dose still remains under 50%, its relative importance has certainly been increasing in the last three decades. It is expected that human population will be the dominating factor which eventually controls the mean dose due to natural radiation in Japan.     

SKT-14型数控风阀跳汰机在峻德选煤厂的应用

该文分析了峻德选煤厂使用的LTG-15型筛侧空气室跳汰机存在的问题及将原LTG-15型跳汰机更新为SKT-14型数控风阀跳汰机后各项分选指标,叙述了SKT-14型跳汰机的结构特点及使用后带来的经济效益。     

电热式硫化机打压装置、冷却装置研制及应用

该文通过介绍电热式硫化机在接头硫化过程中遇到打压、冷却问题,研制一套可靠、实用的硫化打压、冷却装置来保证硫化接头质量。该装置在井下硫化接头中得到了应用,收到良好的效果。     

北方铜业垣曲冶炼厂改造项目工艺节能分析

介绍了北方铜业垣曲冶炼厂处理500kt/a多金属矿综合捕集回收技术改造项目的简况,通过对富氧底吹熔池熔炼技术、封闭稀酸洗涤——接触法双转双吸制酸等先进工艺的技术分析及改造前后主要产品的能耗对比,说明了工艺节能在企业节能减排工作中所起到的重要作用。     

浅淡50kt/a三聚磷酸钠装置设计

从工艺流程、设备布置、材料和标准的选择、管架的选用等方面对三聚磷酸钠装置设计的特点进行了总结。对本装置设计的不足之处也进行了探讨。     

Assessing the reliability of the M5-120 on Amazon’s mechanical Turk

Amazon’s online service, Mechanical Turk (MTurk) has become a popular option for data collection among social scientists. Early work (Buhrmester, Kwang, & Gosling, 2011) indicated that data collection through MTurk was faster and less expensive than traditional collection methods (undergraduate human subject pool), as well as being reliable when administered at different dates. Building on their work, we sought to extend this investigation of reliability to a larger measure. For the current research we chose a 120-item measure of personality. After collecting data through MTurk, it was determined that our MTurk sample had strong test–retest reliability, indicating that they did not significantly change between administration dates.     

Preparation and Evaluation of 2-(Allylthio)Pyrazine-Loaded Lipid Emulsion with Enhanced Stability and Liver Targeting

To develop 2-(allylthio)pyrazine (2-AP)-loaded lipid emulsion for parenteral administration, various lipid emulsions were prepared with soybean oil, lecithin, and other carriers using homogenization method, and their physical stabilities were investigated by measuring their droplet sizes. The pharmacokinetics and tissue distribution of 2-AP in lipid emulsion after intravenous administration to rats were evaluated compared with 2-AP in solution. 2-AP was lipophilic, sparingly water-soluble, and unstable in aqueous medium. The 2-AP-loaded lipid emulsion composed of 1% of 2-AP, 4% of soybean oil, 4% of lecithin, and 91% of water was physically and chemically stable for at least 8 weeks. It gave significantly faster clearance of 2-AP and higher affinity to the organs, especially the liver, compared with the 2-AP in solution, suggesting that it could selectively deliver 2-AP to the liver. Thus, the lipid emulsion with soybean oil and lecithin could be used as a potential dosage form with the liver-targeting property and enhanced stability of sparingly water-soluble 2-AP.     

Statistical testing for sufficient control chart performances during monitoring of grouped processes

With ISO 7870-8, a standardized application of charting techniques for short runs and small mixed batches was presented in 2017. Similar to various scientific approaches, it requires that sample values from grouped processes follow nearly identical distributions. In practice, however, there tend to be differences between distribution parameters. Moreover, equal parameters do not ensure that distributions are properly aligned to the center line and control limits of the chart. These facts can lead to undesired control chart performances which can be expressed by average run lengths (ARL) during in-control and out-of-control conditions. In this work, a statistical test for sufficient control chart performances during monitoring of grouped processes based on preliminary samples is proposed. Control chart performances are defined as sufficient when they deviate within acceptable ranges from usual performances during single process monitoring in mass production. The ARL resulting from estimated distributions and planned production sequences is used as test statistic and calculated via the Markov chain approach. Exemplary tests are executed for scenarios with individuals and cumulated sum (CUSUM) charts. A simulative determination of error rates resulting from the ARL-based testing demonstrates its effectiveness in testing for sufficient control chart performances compared to an indirect testing with Levene's test and a one-way analysis of variance (ANOVA).     

汉字点阵字型技术研究

介绍了点阵字型的设计原理、数据表示方法和字库格式。研究了汉字点阵设计中的简省笔画处理方法,以及点阵字型字库格式常用的BMP、BDP两种格式表示方法。