2种LED灯的蓝圆鲹和竹荚鱼渔获比较

为了探索节能减排的海洋捕捞作业方式,在中国沿海海域做了白光（偏绿光）发射二极管（LED）水下灯和蓝紫光LED水下灯集鱼试验。对比2种等光能LED集鱼灯周围蓝圆鲹（Decapterus maruadsi）和竹筴鱼（Trachurus japonicus）的渔获,对渔获数据进行t检验分析表明,白光LED灯对蓝圆鲹的光诱效果显著优于蓝紫光LED灯;白光LED灯对竹筴鱼的光诱效果极显著优于蓝紫光LED灯。海上试验结果证实,在实验室水槽中所得的光诱鱼试验结果对海洋捕捞实践具有很好的指导作用。     

混药质量浓度在线检测装置

根据溶液质量浓度不同,其折光率不同的原理,设计了一种混药质量浓度在线检测装置。采用波长650 nm二极管激光器作为光源,PSD作为光斑位置探测器,设计和制造了有机玻璃材质的三角形检测管和以OPA4277芯片为主的信号调理电路。在流量为4.7、5.4和6.1 L/min时得到的光斑位置与质量浓度拟合曲线的决定系数R2均大于等于0.983 1,且随着流量的减小,其拟合曲线的决定系数逐渐增大。在流量为6.1 L/min时,在线测量混药质量浓度存在最大偏差为0.075 1 g/L,平均相对误差为8.99%。表明该装置可用于混药质量浓度的在线检测。     

反相离子对液相色谱-二极管阵列检测器测定红薯粉条中溴酸钾

[目的]建立反相离子对液相色谱-二极管阵列检测器测定红薯粉条中溴酸钾的分析方法。[方法]样品以超纯水超声波提取,加入甲醇混合后离心,取上清液微孔滤膜过滤作为供试品液。使用Waters Symmetry shield~(TM)RP18色谱柱,以甲醇∶水(含4.0 mmol/L柠檬酸与0.5 mmol/L十六烷基三甲基溴化铵溶液,pH为4.5)40∶60(V/V)为流动相,二极管阵列检测器扫描检测,以保留时间和190~400 nm光谱定性,210 nm波长下溴酸钾峰面积定量。[结果]溴酸钾在5.135~513.500μg/mL浓度范围内线性关系良好,相关系数大于0.999,方法回收率在83.5%~88.5%,检出限为0.9 mg/kg,定量限为2.5 mg/kg。[结论]该方法简单、快速、可靠、灵敏、高效,可用于红薯粉条中溴酸钾的分析检测。     

LED植物灯在花卉生产栽培中的应用现状及发展趋势

该文通过对LED在花卉领域研究现状的详细阐述,重点介绍了光对花卉生长的影响、LED的光源特性及其在花卉生产栽培方面的应用进展,并对LED植物灯在花卉的促成抑制栽培、人工补光等方面的应用前景进行了分析和展望。     

微型月季花期调控技术研究

为研究微型月季的花期调控技术,以月季“芳香王阳台”“红宝石”为材料,研究了LED灯在不同光照强度(5000,10000,20000lx)、不同光周期(16h/8h,12h/12h)及不同温度处理[16h(25℃)/8h(16℃),16h(25℃)/8h(25℃)]对其生长的影响。结果表明:在光照强度为20000lx,光周期16h/8h时,2个微型月季品种冠幅、株高、分枝数、花朵数、叶面积、叶绿素含量都高于其他处理“芳香王阳台”的株高、冠幅、分支数受光照强度的影响,“红宝石”的株高、冠幅、分支数受长光照周期的影响。在变温处理[16h(25℃)/8h(16℃)]下,月季冠幅、株高变小,叶片的叶绿素含量、叶面积都减少,但该变温处理容易促进月季开花提前,且花朵集中开放。此研究结果为LED光源对微型月季的花期、花型(冠幅、株高)的定向调节提供了基础。     

Precision biometrics data of Atlantic salmon (Salmo salar L.) in commercial grow-out sea-cages: Manual sampling and infrared diode frames compared to processing plant

One of the critical challenges that the global salmon farming industry will confront when upscaling production is accurate biomass control. Commercial salmon farming requires a significant level of certainty regarding fish count, average weight measurement, live weight distribution, and other production indicators. A reliable control system for assessing the biomass of farmed Atlantic salmon is essential for sustainable and cost-effective precision aquaculture. A study was done in four production sea-cages in a Chilean Atlantic salmon marine grow-out farm to estimate the average weight and frequency distribution utilizing the Vaki Biomassdaily® diode frames as an alternate technology to manual weight measurement. From post-smolt reception to fish harvest, diode frames were put in each sea-cage in a secure position for 15 months. There were no significant changes in length or average weight between manual sampling and frame estimate. The mean degree of accuracy for the average weight estimation was 98.83 % for the frames utilized in the four sea cages. The diode frames also achieved a high degree of precision in predicting the frequency distribution of fish. There were no statistically significant variations between the distribution variances of the diode frame measurements and the distribution variances of the fish received at the fish processing facility (FPF). The maximum difference between the average weight calculated by the frames and the average weight of the fish received in the processing facility was 2.4 %, with 99.66 % being the highest accuracy with only 19 g of difference. We determined that diode frames might replace manual weight assessments with greater reliability for growth monitoring and production management. To assure the optimal performance of the diode frames in terms of accuracy and precision for future commercial-scale validations in the salmon farming business, the development of a standard best practice manual is necessary.     

HPLC法测定盐酸左旋咪唑片的含量研究

建立盐酸左旋咪唑片中盐酸左旋咪唑含量测定的高效液相色谱法。采用Agilent Eclipse XDB-C18(250 mm×4.6 mm),5μm色谱柱,Agilent 1260DAD检测器,流动相为0.05 mol/L磷酸二氢钾溶液(三乙胺调节pH值至7.0)-乙腈(80∶20,v/v);进样量为20μL;柱温为30℃;流速为1.0 mL/min;检测波长为214nm。结果表明:盐酸左旋咪唑在1.024～102.398μg/mL范围内线性关系良好(r=1.0000),高、中、低浓度回收率分别为97.4%、99.7%、99.3%。该方法定性、定量准确,适用于盐酸左旋咪唑片中盐酸左旋咪唑的含量测定。     

LED光源在现代农业的应用原理与技术进展

随着LED技术的发展和制造成本的下降,LED光源在现代农业中的应用越来越受到世界各国的广泛关注。LED不仅具有体积小、寿命长、能耗低、发光效率高、发热低等光电特性优点,而且还能根据农业生物的需要进行光谱的精确配置,促进农业生物的生长发育和光形态建成,从而提高其产量和品质。本文介绍了LED在农业照明领域的应用现状,分析了LED在农业领域的应用潜力,指出了限制农用LED推广应用的关键因素,并提出促进LED在现代农业中应用的发展思路、方向和重点以及对策。     

LED固体光源在农、林和园艺中的应用

LED（Light-Emitting Diode）作为一种新颖的固体照明光源被公认为21世纪照明革命的希望.LED固体光源与传统光源相比具有显著优点;LED固体光源在农、林以及园艺中的广泛应用;LED固体光源在农、林及园艺领域具有应用优势和良好的发展前景.