水貂病毒性肠炎病例

青海省某貂场,自1月28日,貂群中零星发生病貂（肠炎症状）,以后病貂逐步增加,至2月28日水貂死亡达158只,自2月29日至3月8日死亡108只。3月1日开始配种。由于水貂之间接触,造成疾病暴发流行。截止3月20日,死亡503只,发病率达95％,死亡率16.7％,致死率17.6％。河北省某貂场,于3月9日发现一只排灰黑色稀粪便之病貂,经抗菌素治疗未愈。3月22日出现具有肠炎症状的病貂,3月29日又发现5只病貂。截止4月2日,发病率已达54％,致死率为4.07％,而疫病仍蔓延流行。疾病的诊断 1.临床症状病貂表现热性病症状,食欲降低或废绝,精神萎糜、倦怠,四脚伸展或卷缩地趴卧。体温升高,40.5—41℃

黄原胶发酵过程中流变学行为和气液传质的研究

在10L搅拌式发酵罐中,研究了黄原胶发酵的流变学行为和气液传质特征.发酵液呈现典型的假塑性行为,后期发酵液稠度系数K大于20Pa*snn,流变指数n低于0.2,随着胶浓度的提高,搅拌所带来的剪切力不够,使有效搅拌区域减小,发酵液几乎不随搅拌浆而转动.考察了表观粘度ηm、搅拌转速N和通气速率Ug对体积氧传质系数kLa值的影响,将kLa值与转速N和表观粘度ηm进行了无因次关联.实验条件较高搅拌下的高剪切,不仅能提高整体混合,而且能够促进细胞周边分泌的黄原胶粘液层向主体扩散,有利于强化传递.在所研究的气速范围内,通气速率的提高似乎对气液传质的贡献不大.具有较高剪切和较大有效搅拌区域的反应器被认为更适合于黄原胶发酵过程

GaAs/AIGaAs光子平行存贮器的性能

报告用PnpN型GaAs/AlGaAs结构的光电双稳器件形成的光子平行存贮器单元器件和4×4阵列器件的特性。单元器件的最小维持功耗小于30μW。使器件从“关闭”态翻转到“导通”态所需的光触发功率小于80μW。单元面积160×160μm、间距40μm的存贮器4×4原理性阵列已经研制成功,这是0.85μm波长范围的光子平行存贮器的首次报道

黄原胶发酵过程中流变学行为和气液传质的研究

在10L搅拌式发酵罐中,研究了黄原胶发酵的流变学行为和气液传质特征。发酵液呈现典型的假塑性行为,后期发酵液稠度系数K大于20Pa.snn,流变指数n低于0.2,随着胶浓度的提高,搅拌所带来的剪切力不够,使有效搅拌区域减小,发酵液几乎不随搅拌浆而转动。考察了表观粘度ηm、搅拌转速N和通气速率Ug对体积氧传质系数kLa值的影响,将kLa值与转速N和表观粘度ηm进行了无因次关联。实验条件较高搅拌下的高剪切,不仅能提高整体混合,而且能够促进细胞周边分泌的黄原胶粘液层向主体扩散,有利于强化传递。在所研究的气速范围内,通气速率的提高似乎对气液传质的贡献不大。具有较高剪切和较大有效搅拌区域的反应器被认为更适合于黄原胶发酵过程

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

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ 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 suppression of 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% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies