自密实混凝土在CL结构墙体中的应用

本文根据CL(Composite Lightweight)结构墙体用自密实混凝土(Self-Compacted Concrete)的特点,阐述了SCC的配合比设计过程及生产运输浇筑过程,提出了SCC配比设计要强度、工作性"两手抓"及CL结构墙体SCC现浇要保证及时性、连续性,并且要"选点下料,连续浇筑"的观点。     

葡萄酒中铁和锌含量的测定

本实验研究了用双波长分光光度法以锌试剂为显色剂,同时测定葡萄酒中的微量元素铁和锌,铁离子的检出限为0～20μg／25 ml,锌离子的检出限为0～30μg／25 ml。本法简便易行,结果可靠,能够同时测定葡萄酒生产中铁离子和锌离子的含量,为葡萄酒生产的质量控制和储存期对品质的影响提供一种途径。     

环形布水器对蓄热水箱释热性能影响的研究

搭建蓄热水箱性能测试平台,设计1种新型的环形布水器进水装置,分别对直接进水、盒型进水结构以及布水器进水结构3种水箱进行实验,并建立蓄热水箱三维结构模型,利用FLUENT进行模拟仿真,进一步观察内部水体的流动情况和分层现象.水箱初始温度设为80℃,进口温度30℃,对比不同流速工况下蓄热水箱的温度曲线、平均温度、释热效率和温度云图来探究分层现象和释热性能.结果表明:在流速较低的情况下盒型进水结构水箱综合性能优于环形布水器水箱,但随着流速的增大,盒型进水结构热性能下降,而环形布水器水箱能够保持较好的热性能,随着流速的增大,进水水流对内部温度层扰动越大,不利于温度分层的形成.     

基于增强现实的多层次协同可视化系统

传统交互设备的信息展示维度存在一定局限性,增强现实技术能够扩展交互空间和信息维度,但在信息的全局交互和决策中则略显不足.该文将传统移动交互设备iPad与增强现实设备HoloLens进行结合,在iPad上展示整体的特征信息的同时,在HoloLens中进行细节的探索.基于这一设计思想创设了一种全新的交互环境,实现多层次多人...     

动力排水固结法软基加固效果数值分析

动力排水固结法是一个瞬态动力响应问题,其复杂性决定了地基土在夯击过程中的特性难以用常规的解析方法进行推证.采用FLAC3D软件对动力排水固结过程作数值模拟,并对动力排水固结法的有效加固深度及加固范围作分析.研究表明,动力排水固结法加固的主要范围是夯锤下方的椭球体区域,表现为竖向压缩,侧向挤压,有效加固深度和加固范围可由数值模拟较准确预测.     

晚期产后出血的临床数据分析

目的根据产后子宫超声影像学数据建模,探讨产后出血情况的评测。方法通过经腹超声动态观测60例产妇的产后24h内及产后6周,测量采集子宫肌壁厚度、宫腔分离大小及子宫体长、宽、厚等数据,并记录产后24h内的出血量。结果经数据分析表明产后24h内的出血量与胎盘娩出后宫腔分离大小及产后6周的子宫复旧成正相关性(P<0.05),而与胎盘娩出后胎盘附着面宫壁厚度之间无明显的相关性(P>0.05)。结论监测产后的宫腔分离和子宫体复旧情况有助于动态分析产后出血的发展及转归,并为临床采取相应措施提供有力的依据。     

Continuous amino-functionalized University of Oslo 66 membranes as efficacious polysulfide barriers for lithium−sulfur batteries

The shuttle effect of soluble polysulfides is a serious problem impeding the development of lithium−sulfur batteries. Herein, continuous amino-functionalized University of Oslo 66 membranes supported on carbon nanotube films are proposed as ion-permselective interlayers that overcome these issues and show outstanding suppression of the polysulfide shuttle effect. The proposed membrane material has appropriately sized pores, and can act as ionic sieves and serve as barriers to polysulfides transport while allowing the passage of lithium ions during electrochemical cycles, thereby validly preventing the shuttling of polysulfides. Moreover, a fast catalytic conversion of polysulfides is also achieved with the as-developed interlayer. Therefore, lithium−sulfur batteries with this interlayer show a desirable initial capacity of 999.21 mAh·g^–1 at 1 C and a durable cyclic stability with a decay rate of only 0.04% per cycle over 300 cycles. Moreover, a high area capacity of 4.82 mAh·cm^–2 is also obtained even under increased sulfur loading (5.12 mg·cm^–2) and a lean-electrolyte condition (E/S = 4.8 μL·mg^–1).     

Development of a Liquid Chromatography Tandem Mass Spectrometric Method for Simultaneous Determination of 15 Aminoglycoside Residues in Porcine Tissues

A quantitative and confirmatory method has been developed for simultaneous determination of 15 aminoglycoside (AG) residues in porcine tissues (muscle, liver and kidney) by liquid chromatography tandem mass spectrometry (LC-MS/MS). The analytes were extracted from different matrices with aqueous trichloroacetic acid solution (5 %, w/v) followed by solid phase extraction (SPE) clean-up under optimised conditions. Due to the different pK _a values of the compounds, two consecutive SPE steps using Oasis HLB cartridges were used to purify all 15 AGs from sample extracts, with 9 AGs quantitatively retained on Oasis HLB cartridges at pH?<1 and the other 6 AGs retained at pH 8.5. The analytes were separated on a reversed-phase C18 column and eluted with water and acetonitrile containing the ion-pair reagent heptafluorobutyric acid (HFBA). The LC-MS/MS method was validated according to Decision 2002/657/EC. The optimised procedure was successfully applied to analyse 100 real porcine tissue samples (60 muscles, 20 livers and 20 kidneys) collected from local markets in southern China, demonstrating that the method is robust and useful for determination of residues of the 15 target AGs in porcine tissue samples.     

字典纸常见纸病及解决措施

本文分析了字典纸常见纸病产生的原因并提出了相应的解决措施.     

豌豆超微粉碎膳食纤维对糖尿病小鼠肠道菌群及其代谢产物的影响

目的：研究豌豆超微粉碎膳食纤维（ultrafine ground pea dietary fiber,UGPDF）对糖尿病小鼠肠道菌群及其代谢产物的影响,从而揭示其降血糖的作用机制。方法：通过腹腔注射链脲佐菌素建立糖尿病小鼠模型,用二甲双胍和高剂量（0.9 g/（mL·d））、低剂量（0.45 g/（mL·d））UGPDF分别灌胃干预4 周,测定小鼠血糖浓度、观察肝脏细胞形态变化,Western blot检测小鼠肝脏中磷脂酰肌醇-3-激酶（phosphatidylinositol-3-kinase,PI3K）/蛋白激酶B（protein kinase B,AKT）/类胰岛素生长因子（insulin-like growth factors,IGF）蛋白表达水平,高通量测序分析各组小鼠粪便中的肠道菌群组成。结果：UGPDF能够调节糖尿病小鼠的肠道菌群丰度及多样性,高剂量UGPDF组操作分类单元（operational taxonomic units,OTU）数达300±36,其Shannon、Simpson指数与糖尿病小鼠存在显著差异（P＜0.05）。在肠道菌群组成中,与模型组相比,UGPDF干预后,Lactobacillus、Lachnospiraceae有益菌相对丰度显著上升（P＜0.05）,Helicobacter、Klebsiella、Clostridium致病菌相对丰度显著下降（P＜0.05）。从代谢产物来看,与模型组相比,经过UGPDF干预后,小鼠粪便内的6 种短链脂肪酸含量总体显著升高（P＜0.05）,其中以高剂量组效果最为显著,乙酸、丙酸、丁酸含量分别提高了63.7%、75.9%和96.0%,且接近正常对照组。同时,肝脏组织切片及Western blot检测结果表明UGPDF可调节糖尿病小鼠肝脏PI3K/AKT/IGF信号通路,修复肝细胞损伤,提高胰岛素敏感性。本实验可为豌豆膳食纤维的高值化利用拓宽思路,并补充完善其降血糖理论。