The effects of oxygenation aeration treatment on dissipation behaviors of tricaine mesylate in carp (Cyprinus carpio) muscle and water

Tricaine mesylate (MS-222) is one of the most used anesthetics in fish. It can be absorbed by the human body via food consumption, with related detriments to human health. In this study, a modified quick, easy, cheap, effective, rugged, and safe (QuEChERS) method was developed for the determination of MS-222 in carp muscle and water samples using liquid chromatography-tandem mass spectrometry (LC-MS/MS). For cleanup procedure, multiplug filtration cleanup (m-PFC) method with n-Hexane delipidation was adopted. The extraction solvent, cleanup methods and sorbents were optimized. All method validation parameters were in the acceptable range. The dissipation behavior study was followed by the method development. Firstly, the anesthesia dose and time were optimized in application study. Secondly, carps were revived for different period of time with (experimental group) and without (control group) the oxygenation aeration treatment to compare the dissipation rate of MS-222. After being anesthetized for 6 h at 50 mg/L and 12 h of elimination, the concentrations of MS-222 in crap muscle and water of experimental group was lower than those of control group. After 36 h of elimination under oxygenation aeration, over 90% of MS-222 was dissipated in carp muscle. The results showed that the half-life of MS-222 in carp muscle was 6.2 h. The findings suggested that the commonly-used oxygenation aeration treatment in aquaculture production had potential effects in accelerating the dissipation of MS-222 in carp and water. In this study, three days of withdrawal period was recommended in carps after MS-222 administration under oxygenation aeration.     

高纯铝箔再结晶晶粒度对比容的影响

通过对ＬＧ５－Ｙ、ＬＧ４－Ｙ两种国产箔退火工艺的研究，重点分析了铝箔再结晶晶粒度对比容的影响，并确定了高比容下的晶粒大小范围。从而为铝箔的退火工艺参数的确定提供了又一重要依据。     

点火药盒开孔大小对点火燃气内流场特性影响

为了保证阶梯多根的装药设计形式的火箭发动机点火过程的安全性与稳定性,研究了不同开孔大小点火药盒的火箭发动机点火过程的流场特性.采用FLUENT计算软件对不同开孔大小点火药盒的火箭发动机点火过程的内流场进行了三维数值仿真,分析了点火药盒开孔大小对点火过程流场特性的影响.不同开孔大小点火药盒的输出压强都大约在4 ms时达到...     

二极管泵浦的微型绿光激光器

本文介绍一种二极管泵浦的Nd:YAG+KTP微型绿光激光器,单纵模532μm的绿色激光输出5.6mW,无“绿色噪声”,器件体积为36mm×32mm×26mm.     

Investigation of LNA lasers operating in high average power

给出了铝酸镁镧（ＬＮＡ）激光晶体在重频脉冲运转下的激光特性，一根６ｍｍ×１１６ｍｍ的ＬＮＡ晶体在脉冲氙灯泵浦下，采用高重频脉冲工作方式，激光平均输出功率达到８６６Ｗ，斜效率２５％。     

高峰值功率重频脉冲固体激光器

综述了高峰值功率重频脉冲固体激光器的发展现状，对其中的Ｑ开关、腔倒空、锁模等窄脉冲技术和放大技术进行了分析，展示了高峰值功率重频脉冲固体激光器的发展前景。     

热晕及其相位补偿数值模拟与定标规律研究

本文对激光通过大气传输引起的热晕进行数值模拟，并采用相位补偿的方法对热晕进行校正，从计算结果中得到经过相位补偿后，光束质量有较好的改善，Ｓｔｒｅｈｌ比有所提高。从模拟结果中还总结出补偿后的热晕 定标规律公式，发现热晕经补偿后的功率阈值提高３倍以上。     

CA型固体钽电容器的老化筛选方法

ＣＡ型固体钽电容器是重要的电子元件，为淘汰早期失效产品，确保高的可靠性水平，采用合适的筛选方法十分必要。介绍了：１．敲击漏电流闪变筛选；２．电参数性能测量筛选；３．温度循环筛选；４．高温电负荷老化筛选；５．高温浪涌电压老化筛选；６．高温漏电流老化筛选；７．密封检验筛选。筛选效果最明显的是４、６两项     

改善ZnO压敏元件温度特性的研究

从实验上探索了降低ＺｎＯ压敏陶瓷元件泄漏电流温度系数的途径和方法，研制了特殊添加物，在通常的ＺｎＯ压敏瓷料中添加适量特殊添加物，可以改变ＺｎＯ压敏陶瓷泄漏电流的温度特性，达到降低泄漏电流温度系数的目的。泄漏电流随温度变化在３１～３４°Ｃ出现极大值可能是杂质离子对电子的散射作用所致。     

耐温强酸性阳离子交换树脂催化合成乙酸丁酯

开发了耐温强酸性阳离子交换树脂催化剂,采用此催化剂,以乙酸和正丁醇为原料合成了乙酸丁酯。用13C核磁共振光谱表征了耐温强酸性阳离子交换树脂催化剂的结构;在工业生产条件下,对比了不同强酸性阳离子交换树脂催化剂的活性;以耐温强酸性阳离子交换树脂为催化剂,考察了进料量对乙酸转化率的影响及催化剂的稳定性。实验结果表明,以耐温强酸性阳离子交换树脂为催化剂合成乙酸丁酯,在反应釜温度120℃、分馏柱顶部温度91~92℃、正丁醇与乙酸摩尔比1.02、进料量60mL/h的条件下,乙酸的转化率为95.1%,达到了采用硫酸催化剂时的水平。耐温强酸性阳离子交换树脂催化剂的寿命在500h以上,稳定性好,具有较好的工业化前景。