双连拱隧道浅埋段中隔墙稳定性研究

利用中隔墙左右两侧主筋轴力推导出其轴力N及水平力H的计算公式，进而计算中隔墙的稳定性系数，将其运用到马岭峡谷隧道一个浅埋段中隔墙稳定性的分析中，发现中隔墙浇筑、先行洞靠近中隔墙部分上台阶开挖与初支、后行洞靠近中隔墙部分上台阶与下台阶开挖与初支对中隔墙轴力N及水平力H有比较大的影响，是产生偏压的主要原因。该断面最小稳定性系数发生在2021年11月17日，最小系数为8.70，大于1.6。说明中隔墙在主洞开挖支护的所有时间所测得的稳定性系数均满足该要求，中隔墙在施工过程中稳定性满足规范要求。     

中国煤中硒的研究综述

分别从中国煤中硒的丰度、赋存状态和有机亲和性、迁移性和环境效应3个方面讨论了煤中硒的研究概况。硒在煤中相对于地壳中富集,不同地区、不同成煤期,煤中硒的含量差异很大;煤中硒大部分以有机结合态存在,无机结合态的硒大多数存在于黄铁矿中;在燃烧过程中,硒主要以气态的形式进入大气,或被极细飞灰吸附,污染环境,危害人体健康。     

氯含量的测定

介绍了次氯酸钠中有效氯、水中氯离子、工业硫酸中氯离子、空气中氯、有机物中氯含量的测定方法。     

不同土层中地下结构抗浮作用的试验研究

本文通过模型试验的方法，对不同土层中地下结构所受浮力进行试验，主要探讨砾石、中砂和粘土中地下水对结构的浮力作用效应，通过水位的变化和对中砂中孔隙率的不同来探究浮力的变化规律，试图通过试验，来研究无粘性土与粘性土中浮力的作用之区别。     

关于N,N-二甲基甲酰胺、氯化铵、硝酸对湿法磷酸生产工艺影响的研究

将生产硝基苯过程中所产生的废酸加入到湿法磷酸生产工艺中参与反应，研究了N,N-二甲基甲酰胺、氯化铵、硝酸对湿法磷酸生产工艺中磷矿的分解率，石膏中总磷的含量、滤液中磷酸和SO₃的含量的影响。结果发现：向湿法磷酸生产工艺中加入质量分数为3%的HNO₃、2%的DMF、1%的NH₄Cl,对湿法磷酸生产工艺中石膏中总磷含量、滤液中总磷含量和SO₃的含量基本没有影响，且磷矿的分解率增大。由此可见，将硝基苯所产废酸加入到湿法磷酸工艺中使用具有可行性。     

浅析-OH控制在特种玻璃生产中的应用

主要介绍了玻璃中羟基含量对玻璃性能的影响,以及高档电子玻璃生产中羟基控制的重要意义,同时分析了空气助燃的窑炉和纯氧窖炉中影响玻璃液羟基含量的因素,并综述了实际生产中调整玻璃液中羟基含量的重要手段。     

通过实验对比研究分析了污水处理中所需测定的石灰粉中的钙应为有效钙

在选用方法测定氢氧化钙中氢氧化钙含量的过程中,发现使用石灰中钙离子测定的EDTA方法测得氢氧化钙中氢氧化钙的含量比氢氧化钙测定方法中测得氢氧化钙中钙的的含量要高2％左右.通过对比实验研究发现,我们污水处理中使用的钙的指标,不应该使用全钙的方法,而应该测定的是有效钙.全钙的测定方法给我们污水处理的指导带来很大的误区.实验...     

计算机概念教学的内容及对策

介绍有关概念教学的重要性及在概念教学中重视培养学生的思维能力、概念教学过程中应注意的问题和概念教学中采取的包括淡化、浅化、深化、跨越,在概念教学中应注意的问题,     

我国中微量元素肥料应用现状与前景分析

简述推广施用中微量元素肥料的必要性,介绍我国中微量元素肥料的施用与生产现状,讨论中微量元素肥料推广应用中存在的问题,提出我国中微量元素肥料将向多元化、高效化、多功能化的方向发展。     

表面活性剂在制药工业中的应用

论述了表面活性剂在药物制剂中做药剂辅料、在药物合成中做相转移催化剂以及在药物荧光分析中做增溶增敏剂的应用原理及现状,介绍了表面活性剂在制药工业中应用研究的新进展,提出了在制药工业中应用表面活性剂的展望。     

PET中环状低聚物的表征及控制方法的研究进展

鉴于环状低聚物的诸多危害,归纳了PET中环状低聚物的表征方法,具体介绍了低聚物的分离方法及其性能的研究方法,重点总结了目前减少环状低聚物含量的一些新的措施和方法,以期为今后的相关研究提供参考,并提出应该建立工业上简便易行的环状低聚物含量检测方法。     

Changes in the Cell Wall Proteome of Leaves in Response to High Temperature Stress in Brachypodium distachyon

High temperature stress leads to complex changes to plant functionality, which affects, i.a., the cell wall structure and the cell wall protein composition. In this study, the qualitative and quantitative changes in the cell wall proteome of Brachypodium distachyon leaves in response to high (40 °C) temperature stress were characterised. Using a proteomic analysis, 1533 non-redundant proteins were identified from which 338 cell wall proteins were distinguished. At a high temperature, we identified 46 differentially abundant proteins, and of these, 4 were over-accumulated and 42 were under-accumulated. The most significant changes were observed in the proteins acting on the cell wall polysaccharides, specifically, 2 over- and 12 under-accumulated proteins. Based on the qualitative analysis, one cell wall protein was identified that was uniquely present at 40 °C but was absent in the control and 24 proteins that were present in the control but were absent at 40 °C. Overall, the changes in the cell wall proteome at 40 °C suggest a lower protease activity, lignification and an expansion of the cell wall. These results offer a new insight into the changes in the cell wall proteome in response to high temperature.     

Color-emotion associations in interiors

Emotional reactions to red, green, blue, and gray colors in a living room were investigated using a self-report measure. Participants first watched a short video of a 3D model of a living room. Next, they were asked to match the living rooms with facial expressions of six basic emotions. The most stated emotions associated for the red room were disgust and happiness, while the least stated emotions were sadness, fear, anger, and surprise; for the green room, neutral and happiness were the most stated emotions, and anger, surprise, fear, and sadness were the least stated ones; for the blue room, neutral was the most stated emotion, while the least stated emotions were anger and surprise. Neutral, disgust, and sadness were the most stated emotions for the gray room. Gender differences were not found in human emotional reactions to living rooms with different wall colors.     

等离子体裂解煤制乙炔技术的研究进展

回顾了国内外等离子体裂解煤制乙炔的研究概况,介绍了国内近年来在理论研究和试验研究方面取得的进展,分析了该工艺的经济效益和社会效益,对等离子体裂解煤制乙炔主要技术瓶颈和成果进行了讨论,提出了下一步的研究方向。     

Imbalance diets in preschool children: study in a day-care center in the Province of Buenos Aires,Argentina

The purpose of this study was to investigate the impact of low fat diets in children aged 2 to 5. Eighty two children (40 females and 42 males) attending a school cafeteria (Province of Buenos Aires, Argentina), in a cross sectional study, were evaluated. Body weight (W), height (H) and body composition (BC) by bioimpedance were recorded. The anthropometric raw data were processed as Z-score of the weight-for-age (WEZ) and of the height-for-age (HAZ). Serum insulin-like growth factor 1 (IGF-1) and Zinc/haemoglobin ratio (Zn/Hb) were also measured. Results showed that 73.2% of the children were adequate (A) according WEZ, 13.4% were lean (L) and 13.4% overweight (O). 8.5% presented simultaneously impairment in WEZ and HAZ. Body fat percentage and energy metabolism were higher in O than in L and A (p < 0.05). Serum IGF-1's children--aged 4 to 5 years--with HAZ deficit were low than adequate HAZ ones. No statistical differences in Zn/Hb ratio between A, L and O were found. This cross sectional study suggests metabolic disorders in young children attending school cafeterias. These conclusions will allow to design balanced diets in order to optimize the resources, promote optimal growth and development and prevent adult diseases through dietary practices in childhood.     

色谱反应分离器研究进展

本文介绍色谱反应分离器的原理及研究进展，概述在化学和生物工程产品制备方面的应用，并指出进一步研究的方向。     

干燥设备在我国制盐工业中的应用

阐述了固定流化床、振动流化床及内加热流化床在制盐行业的选用和使用条件，并介绍了几种应用实例。对干燥工艺与干燥器结构提出了改进建议；简要概述我国制盐干燥技术的现状，提出了一些节能措施。     

甲缩醛的研究进展

概述了甲缩醛的基本合成方法,如甲醛和甲醇反应精馏制备甲缩醛、甲醇与多聚甲醛合成甲缩醛、二甲醚氧化法合成甲缩醛、二溴甲烷合成甲缩醛、甲醇一步氧化法合成甲缩醛,对某些合成方法进行了评述、成本分析和评价,并简单介绍了甲缩醛在各方面的应用以及发展前景。     

纳米TiO2掺杂改性新进展及环境降解中的应用

针对近年来纳米TiO2研究的新成果,对掺杂改性纳米TiO2的研究进行了综述,详细论述了金属与非金属的单掺、共掺对光催化活性的影响.并对纳米TiO2在环境保护领域的主要应用进行了评述,指出TiO2光催化剂在改性过程中亟待解决的问题及在实际应用中的发展.     

Ziegler-Natta聚丙烯催化剂体系给电子体的研究进展

综述了 Ziegler-Natta聚丙烯催化剂体系中给电子体化合物的研究进展。按照给电子体化合物在催化体系中的作用及化学结构进行了详细的分类;指出了Z-N聚丙烯催化剂体系给电子体的研发趋势。