Ti6Al4V钛合金表面蓝色微弧氧化膜的制备及性能

利用微弧氧化技术在Ti6Al4V钛合金表面制备出蓝色微弧氧化膜。对微弧氧化膜的微观形貌和元素组成进行了分析,并对微弧氧化膜的显微硬度进行了测试。结果表明:微弧氧化膜表面光整,呈均匀深蓝色,其主要由Ti、Mn、O和C四种元素组成,还含有少量的V、Al和Si元素;微弧氧化膜的表面粗糙度约为0.159μm,与钛合金的表面粗糙度相近;微弧氧化膜的显微硬度为5 437.4 MPa,显著高于钛合金的显微硬度。     

图像半色调化算法研究综述

半色调化算法是图像打印输出的关键技术之一。介绍了简单阈值比较算法、使用随机数的半色调化算法、误差扩散算法、点扩散算法、按序抖动算法和抖动算法等一系列半色调化算法,并揭示了这些算法之间的联系。为了高效率地对图像做半色调化操作,商用光栅图像处理器一般使用抖动算法。抖动算法生成的半色调化图像的质量取决于所采用的抖动矩阵。基于几何分割设计半色调化抖动矩阵的方法可以在满足堆栈限制的前提下优化半色调化图像的质量。使用随机数的半色调化算法可以消除图像半色调化中产生的莫尔纹。随机半色调化算法的基础是将一定数量的随机点均匀地分布到一个正方形区域中。Asano提出了随机点均匀分布问题等价于圆形装填问题的命题,本文对该命题给出了初步的证明。最后,给出了一些有待进一步研究的图像半色调化课题。     

亚甲基蓝掺杂聚乙烯醇四波混频的实验研究

为了研究在低功率连续He-Ne激光条件下亚甲基蓝掺杂聚乙烯醇薄膜简并四波混频的基本特性,采用简并四波混频技术研究了亚甲基蓝掺杂聚乙烯醇的相位共轭光与入射角度、前抽运光和后抽运光的变化关系,以及透射光栅和反射光栅对相位共轭光的影响.在实验中得到了最大的相位共轭反射率为0.27%.所得的结果对研究染料固化在固体基质中的非线性研究是有帮助的.     

兰炭和天然气在独立热源矿粉企业应用对比

随着国家环保治理的不断深入,很多拥有工业锅炉和窑炉的企业被要求煤改气.我公司作为一家使用独立烘干热源的矿粉企业,2018～2020年间,在当地政府环保部门的要求下完成了两台沸腾炉的煤改气工作.改造完成后,使用天然气作为燃料能够保证矿粉企业的稳定供热需求;在热能利用率上比使用兰炭更高,能够节能15％以上;同时在使用先进的...     

分光光度法测定卵磷脂中磷

微量磷的测定,常采用磷钼兰光度法,近年来有报道应用极谱分析法［１］ 。磷钼兰光度法利用Ｐ（Ｖ） 与钼酸铵形成磷钼杂多酸,应用不同还原剂还原为磷钼杂多兰,测定吸光度。应用ＮａＦ－ ＳｎＣｌ２ 作还原剂,基于酸性介质中磷钼兰光度法,以淀粉作稳定剂,在室温下（１５ ～２５ ℃） 显色。该方法具有颜色稳定、试剂易得、酸度范围大的特点。用于具有重要生物功能的保健性药物卵磷脂中磷的测定,结果与传统方法测定结果相一致。摩尔吸光系数ε＝ ２ ．２ ×１０４ Ｌ／（ｍｏｌ·ｃｍ） ,相对标准偏差０ ．５ ％ ～１ ．１ ％ ,加标回收率在９６ ．６ ％ ～１０６ ．７ ％ 之间,结果满意。     

硅钼蓝分光光度法测定铁矿石中二氧化硅含量测量不确定度评定

应用测量不确定度评定理论,结合日常工作和实验方法,分析硅钼蓝分光光度法测定铁矿石中二氧化硅含量的影响因素,计算和评定测定过程各不确定度分量,最终给出分析结果的测量不确定度.     

Light Spectral Composition Modifies Polyamine Metabolism in Young Wheat Plants

Although light-emitting diode (LED) technology has extended the research on targeted photomorphogenic, physiological, and biochemical responses in plants, there is not enough direct information about how light affects polyamine metabolism. In this study, the effect of three spectral compositions (referred to by their most typical characteristic: blue, red, and the combination of blue and red [pink] lights) on polyamine metabolism was compared to those obtained under white light conditions at the same light intensity. Although light quality induced pronounced differences in plant morphology, pigment contents, and the expression of polyamine metabolism-related genes, endogenous polyamine levels did not differ substantially. When exogenous polyamines were applied, their roborative effect were detected under all light conditions, but these beneficial changes were correlated with an increase in polyamine content and polyamine metabolism-related gene expression only under blue light. The effect of the polyamines on leaf gene expression under red light was the opposite, with a decreasing tendency. Results suggest that light quality may optimize plant growth through the adjustment of polyamine metabolism at the gene expression level. Polyamine treatments induced different strategies in fine-tuning of polyamine metabolism, which were induced for optimal plant growth and development under different spectral compositions.     

沙柳基磁性多孔炭的制备及其吸附亚甲基蓝性能研究

采用水热法原位改性沙柳生物炭制备磁性多孔炭复合材料,利用SEM、XRD、FT-IR、XPS和BET分别对多孔炭的形貌、结构表征,并研究磁性多孔炭吸附去除废水中亚甲基蓝性能.系列表征分析结果表明磁性复合材料表面疏松多孔,比表面积为63.01 m2/g,含有-COOH、-OH等丰富的官能团.在亚甲基蓝初始质量浓度为50 m...     

Blue-Green (~480 nm) versus Blue (~460 nm) Light for Newborn Phototherapy—Safety Considerations

We have previously shown that the phototherapy of hyperbilirubinemic neonates using blue-green LED light with a peak wavelength of ~478 nm is 31% more efficient for removing unconjugated bilirubin from circulation than blue LED light with a peak wavelength of ~452 nm. Based on these results, we recommended that the phototherapy of hyperbilirubinemic newborns be practiced with light of ~480 nm. Aim: Identify and discuss the most prominent potential changes that have been observed in the health effects of phototherapy using either blue fluorescent- or blue LED light and speculate on the expected effects of changing to blue-green LED light phototherapy. Search the phototherapy literature using the terms neonate, hyperbilirubinemia, and phototherapy in the PubMed and Embase databases. Transitioning from blue fluorescent light to blue-green LED light will expose neonates to less light in the 400–450 nm spectral range, potentially leading to less photo-oxidation and geno-/cytotoxicity, reduced risk of cancer, and decreased mortality in extremely low-birthweight neonates. The riboflavin level may decline, and the increased production and retention of bronze pigments may occur in predisposed neonates due to enhanced lumirubin formation. The production of pre-inflammatory cytokines may rise. Hemodynamic responses and transepidermal water loss are less likely to occur. The risk of hyperthermia may decrease with the use of blue-green LED light and the risk of hypothermia may increase. Parent–neonate attachment and breastfeeding will be positively affected because of the shortened duration of phototherapy. The latter may also lead to a significant reduction in the cost of phototherapy procedures as well as the hospitalization process.     

复合乳化剂在栀子蓝色素乳化中的应用

研究了复合乳化剂在栀子蓝色素乳化中的应用,通过实验确定乳液的亲水亲油平衡值(HLB)为3.5,配方实验确定最佳的复合乳化剂为50%单甘酯,20%油酸和30%司盘60。正交实验确定最佳的乳化条件为:乳化剂量1%,乳化温度65℃,乳化时间30min,搅拌速度1200r/min,沉淀量为1.02g。