Synthesis and Characterization of Lanthanide Complexes Involving Cyclopentadienyl and N-phenylzohydroxamic Acid

合成了以茂基和 N-苯基苯甲异羟肟酸为配体的一系列新型稀土金属有机配合物 Cp2 Ln L( Cp=η5-C5H5;Ln=Sm,Nd,Gd,Dy,Ho,Er,Yb Pr;L=C6H5CONOC6H5)。产物经元素分析、IR和 MS表征A series of new mixed-ligand organolanthanide complexes involving cyclopentadienyl and N-phenylbenzohydroxamic acid ligands Cp 2LnL(Cp=η 5-C 5H 5; Ln=Nd,Sm,Gd,Dy,Ho,Er,Yb Pr; L=C 6H 5CONOC 6H 5) have been synthesized. All the complexes were characterized by elemental analysis, IR and MS spectra.安徽省自然科学基金 ( 0 0 0 46 5 0 9);; 安徽省教育厅项目基金 ( 2 0 0 0 j10 90

一种束丝藻毒素的提取方法

本发明公开了一种束丝藻毒素的提取方法，首先是材料的采集，采集水华束丝藻，冷冻干燥；其次是称取冷冻干燥的束丝藻藻粉，加入乙酸，破碎，在室温下磁力搅拌提取，离心，收集上清；第三是粗提物的纯化，将粗提物过固相萃取柱，用酸化甲醇洗脱，并将洗脱液浓缩；第四是将浓缩样品用乙酸溶液溶解，调ｐＨ值，低温保存。本发明方法易行，操作简便，安全可靠，可广泛地用于对有毒束丝藻水华的监测和预警工作

普定喀斯特生态系统观测研究站的生物样地建设与监测工作

生长和适应于喀斯特地貌环境的生态系统,即喀斯特生态系统,因人类活动干扰和石漠化进程影响,其结构和功能均发生退化,因此,定位、长期监测喀斯特生态系统的组成、结构、过程和功能,以及人类活动的影响和响应,对研究该类特殊生态系统的格局和动态变化具有重要意义。作为中国科学院生态系统观测网络(CERN)仅有的两个喀斯特台站之一,普定喀斯特生态系统观测研究站的生物监测总目标是开展喀斯特高原常绿落叶阔叶混交林的植被生态学(结构、过程、功能)监测与研究,及其退化植被的恢复生态学示范,建立喀斯特植被恢复与重建的优化模式和范式。本文初步介绍了普定站的生物观测网络,以普定县后寨河流域的天龙山常绿落叶阔叶混交林样地作为永久监测样地(主观测场),以陈旗不同干扰方式下的植被恢复样地、赵家田皆伐样地、沙湾主站址退耕样地作为辅助监测样地(辅观测场),以高羊河流域陈家寨坡耕地恢复和滇柏林改造样地作为生态重建示范样地(辅观测场),配合流域内外诸多样地与试验点(站区调查点),可初步定位监测和预测代表性喀斯特森林和灌丛的长期变化与未来发展趋势

Prediction of Energy Resolution in the JUNO Experiment

International audienceThis paper presents the energy resolution study in the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The study reveals an energy resolution of 2.95% at 1 MeV. Furthermore, the study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data taking. Moreover, it provides a guideline in comprehending the energy resolution characteristics of liquid scintillator-based detectors

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^