四极子微腔的光场分布

应用电磁场理论和介质中的麦克斯韦方程组,推导了任意截面微腔的TM模光场分布。并以四极子状微腔截面为例,推导了含有传播常数的本征方程。用Mathematica软件模拟出具有不同变形因子的基模(m=1)和高阶模的光场分布图,得出基模在=45°,135°,225°,315°四个方向光辐射最强,具有“蝴蝶结模式”特征,并且当变形因子值取ε′为0.1~0.15时,该效应表现得更明显;而高阶模(m≥2)时微腔中没有这种光的定向输出现象,在任何变形因子情况下也不能形成稳定的“蝴蝶结模式”,为四极子微腔激光器的设计和制作提供了一定的理论依据。     

固体进样元素分析技术在农业领域的应用

重金属是农产品、农田土壤、肥料、饲料等农业样品中的重要污染物,传统的实验室分析方法需繁琐的前处理,耗时费力,无法满足重金属的快速检测需求。固体进样元素分析技术具有简化样品前处理、便捷、绿色、高效等优势,在农业领域中元素的快速检测分析中具有良好的应用前景。通过对固体进样元素分析技术,包括样品导入技术和电热蒸发、电感加热、激光烧蚀、X射线荧光光谱、激光诱导击穿光谱等固体进样分析系统进行综述,并对这些技术在农业领域中的应用做了进一步的梳理。固体进样分析技术已在农业样品中元素的快速检测、现场监测、风险评估等工作中发挥着举足轻重的作用,相信随着仪器研发、材料科学、机器学习等新兴技术的快速发展,其结构小巧、使用简单、分析迅速等优势将会充分发挥,为农业领域中质量安全监管提供一种更为有效、可靠的快速检测手段。     

GaAs FET功率放大器温度补偿的设计

介绍了GaAs FET功率放大器温度补偿的基本原理,分析了GaAs FET功率放大器的增益随温度变化的原因,并给出了解决方法。此方法还可移植到其他类似需要温度补偿的放大器中。     

用MATLAB回归非线性模型参数

非线性模型参数回归难度大,需要一定的数学基础,用MATLAB回归分析工具箱可直接进行非线性回归,计算简单准确,并能给出直观的拟合曲线图。     

柱前衍生高效液相色谱法测定食物中氨基酸含量

采用柱前衍生高效液相色谱法,测定了食物中天冬氨酸、赖氨酸、亮氨酸等１６种氨基酸含量。衍生试剂为６－氨基喹啉基－Ｎ－羟基玻珀酰亚氨基甲酸酯（ＡＱＣ）,流动相为磷酸盐与峰面积呈良好的线性关系,相关系数均在０．９９以上,回收率在８８％～１１０％之间,样品测定结果良好。     

Experimental simulation of capillary effect on rough flat surfaces

The movement of the liquid column inside the slit was utilized to experimentally simulate the character-istics of the capillary force per unit length for differ...     

路的补图的色唯一性

设Pn表示n阶的路。[2]中刘猜测：如果n是偶数且n≠4,则/Pn色唯一的。本得到/Pn色唯一的充要条件,从而肯定的回作了刘提出的猜测。     

分形聚集逾渗性质的计算机模拟

提出3种模型——小尺寸随机逐次成核生长模型和二维及三维代代聚集生长模型,在不同的近邻条件下和不同尺寸的网格中,通过蒙特卡罗模拟,系统地研究了一维、二维和三维分形聚集的逾渗性质.计算结果显示,分形聚集的逾渗阈值仅取决于空间维数和近邻条件,与模型的网格大小无关,是分形系统固有的临界属性;生长概率等于逾渗阈值时,聚集体可以无限生长并保持分形维数恒定,此时的分形维数只是空间维数的线性函数.     

Effects of Compound Elicitors on the Biosynthesis of Triterpenoids and Activity of Defense Enzymes from Inonotus hispidus (Basidiomycetes)

Inonotus hispidus has various health-promoting activities, such as anticancer effects and immune-stimulating activity. The commercialization of valuable plant triterpenoids faces major challenges, including low abundance in natural hosts and costly downstream purification procedures. In this work, orthogonal design was used to compound methyl jasmonate (MeJA), salicylic acid (SA), oleic acid, and Cu²⁺, and the effects of combinations on the total triterpenes biosynthesized were studied. The optimal combination was screened out and its effect on the activity of PAL, CAT, and SOD was studied. The optimal concentration of oleic acid was 2% when MeJA was 100 mol/L, and the total triterpenoid content and mycelia production were 3.918 g and 85.17 mg/g, respectively. MeJA treatment induced oxidative stress, and at the same time increased the activity of related defense enzymes. Oleic acid is thought to regulate cell permeability by recombining cell membranes. It promotes the material exchange process between cells and the environment without affecting cell growth. When oleic acid was used in combination with MeJA, a synergistic effect on triterpene production was observed. In conclusion, our findings provide a strategy for triterpenoid enrichment of I. hispidus.