一种高效能的锂离子电池正极材料及其制备方法和应用

本发明涉及一种高效能的锂离子电池正极材料及其制备方法和应用。具体地，所述正极材料具有成本低、安全性好、高放电倍率下倍率性能优异的特点。所述制备方法具有工艺简单、环保安全等特点。使用所述正极材料作为锂离子电池正极活性材料，不仅可有效提高现有锂离子电池的性价比，更可显著提高锂离子电池的倍率性能，进而提高电池产品的市场竞争力，也更加能够满足终端用户的应用需求

新型冠状病毒肺炎预防与控制的研究进展

从2019年12月至今，以中国武汉华南海鲜市场为中心在全国范围爆发了新型冠状病毒肺炎疫情，主要传播途径为呼吸道飞沫和接触传播，气溶胶和消化道等传播途径尚待明确，人群普遍易感。此次疫情其传播速度之快、范围之广，引起全国乃至全世界的广泛关注及重视。根据此次疫情发展的特点，论文对新型肺炎预防与控制进展进行综述。</jats:p

羽翈中DNA和糖皮质激素共提取技术的研究

羽毛是鸟类研究、监测和管理中常用的非损伤性材料，可从中提取DNA和激素进行遗传和生理分析。然而，作为高度角化的组织，羽翈中的DNA和激素含量极低，提取较为困难。本研究开发一种能够从羽翈中同时提取总DNA和糖皮质激素的方法，命名为DH-CoEx。以丹顶鹤（Grus japonensis）、绿孔雀（Pavo muticus）为代表的大型鸟类廓羽、尾上覆羽和以栗鹀（Emberiza rutila）、小鹀（E.pusilla）为代表的小型鸟类飞羽、绒羽进行测试和评估。结果显示：DH-CoEx能有效从完全角化的羽翈中同时提取出总DNA及糖皮质激素（皮质醇）；从5 mg样本中提取的线粒体DNA（mtDNA）拷贝数达到104量级，可支持长达1 350 bp的片段扩增；所提取的核DNA（nuDNA）质量足以进行长达200 bp的微卫星等位基因分型，成功率为98.11% ~ 99.60%；提取的皮质醇含量达到了传统单一提取激素方法的水平，足以进行相关生理学分析。以上结果说明，DH-CoEx是一种简易、高效和适用性广泛的方法，实现了角化材料总DNA和糖皮质激素的共提取，可以支持mtDNA和微卫星等分子标记的分析和应激激素的分析，极大地提高了羽毛的利用率，具有广泛的应用潜力

Study on Integrated Estimation and Evaluation of Environmental Conservation Functions of Open Spaces by Using Environmental Information System

We have executed this study with environmental information system at ZUSHI city. This study is quantitative analisis and integrated estimation and evaluation of environmental conservation functions. This evaluation of open spaces is determined by following three functions ; (1) land function which prevents surface erosion and soil erosion, (2) ecological function which expresses naturalness degree of vegetation and diversity of organisms, (3) landscape function which is important for us to have a view of surrounding open spaces. This result offered a guide of environmental conservation for adjusting regional development and conservation. At the planning stage of changing land use, we could present the degree of impact and improvement plan for open spaces

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

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel