检索结果-南通市图书馆

黄曲霉毒素B1诱导大鼠肝细胞凋亡率剂量效应模型的构建

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

食品科学 2024年第3期45卷 61-67页

作者：黄奥迪严佳惠张昭寰刘海泉赵勇欧杰上海海洋大学食品学院上海201306 上海水产品加工及贮藏工程技术研究中心上海201306 农业农村部水产品贮藏保鲜质量安全风险评估实验室(上海) 上海201306

通过黄曲霉毒素B1(aflatoxin B1,AFB1)诱导大鼠肝细胞凋亡的定量数据,从而构建AFB1诱导大鼠肝细胞凋亡率的剂量效应模型。通过拟合模型获取决定系数和进一步的数学检验表明,Gamma模型(R2=0.996 4,赤池信息量准则=37.40,贝叶斯信息准则=1... 详细信息

通过黄曲霉毒素B1(aflatoxin B1,AFB1)诱导大鼠肝细胞凋亡的定量数据,从而构建AFB1诱导大鼠肝细胞凋亡率的剂量效应模型。通过拟合模型获取决定系数和进一步的数学检验表明,Gamma模型(R2=0.996 4,赤池信息量准则=37.40,贝叶斯信息准则=17.19)优于其他模型。建议选用Gamma模型作为大鼠急性暴露于AFB1后肝细胞凋亡率的最优剂量效应模型,用于AFB1风险评估框架中的危害特征描述。

关键词：黄曲霉毒素B1 肝细胞凋亡风险评估剂量效应模型

土臭素对淡水鱼品质的影响及控制策略研究进展

在线全文

学校读者我要写书评

暂无评论

水产学报 2024年第7期48卷 26-36页

作者：赵勇王天艺李慷潘迎捷刘海泉上海海洋大学食品学院上海海洋大学上海水产品加工及贮藏工程技术研究中心上海海洋大学农业农村部水产品贮藏保鲜质量安全风险评估实验室(上海) 上海海洋大学水产科学国家级实验教学示范中心

水产品味道鲜美，营养丰富，是人类摄取食物蛋白的重要来源。但以土腥味为代表的特殊异味在淡水养殖的鱼类中经常出现，不但影响水产品的风味，更降低了消费者的消费意愿，制约着水产品养殖行业的稳定发展。而科学控制和预防水产品中的... 详细信息

水产品味道鲜美，营养丰富，是人类摄取食物蛋白的重要来源。但以土腥味为代表的特殊异味在淡水养殖的鱼类中经常出现，不但影响水产品的风味，更降低了消费者的消费意愿，制约着水产品养殖行业的稳定发展。而科学控制和预防水产品中的土腥味是保障水产品质量的重要手段，对满足产业需求具有重要意义，仍需深入研究。本文综述了水产品中以土腥味为典型代表的特殊异味，探讨了以土臭素为代表的异味物质在水产品中造成土腥味的机理，并结合目前控制土腥味的常用方法，对未来水产品异味防控发展趋势进行展望，以期消除水产品中的异味物质，尤其是淡水养殖的水产品中存在的土腥味。

关键词：淡水鱼土腥味土臭素控制措施

Dynamics and control of variable geometry truss manipulator

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2017年第2期38卷 243-262页

作者： Xiaofeng liu Qishuai WANG haiquan LI Guoping CAI Department of Engineering Mechanics State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai 200240 China

Variable geometry truss manipulator （VGTM） has potential to work in the future space applications, of which a dynamic model is important to dynamic analysis and control of the system. In this paper, an approach is presented to model the dynamic equations of a VGTM by independent variables, which consists of two double-octahedral truss units and a 3-revolute-prismatic-spherical （3-RPS） parallel manipulator. In this ap- proach, the kinematic recursive relations of two adjacent bodies and geometric constrains are used to deduce the kinematic equations of the VGTM, and Jourdain＇s velocity varia- tion principle is adopted to establish the dynamic equations of the system. The validity of the proposed dynamic model is verified by comparison of numerical simulations with the software ADAMS. Besides, an active controller for trajectory tracking of the system is designed by the computed torque method. The effectiveness of the controller is numer- ically proved.

关键词： variable geometry truss manipulator (VGTM) double-octahedral truss unit,3-revolute-prismatic-spherical (3-RPS) parallel manipulator dynamic modeling activecontrol

基于风险投资视角创业企业风险分析--以WeWork为例

在线全文

学校读者我要写书评

暂无评论

吉林金融研究 2024年第6期 13-18页

作者：刘新茹刘先慧刘海泉西北民族大学经济学院甘肃兰州730106

风险投资逐渐成为创业企业重要的融资渠道,然而风险投资成功率却比较低,大多数创业企业以失败告终。WeWork作为共享办公龙头企业便是典型的失败案例之一。2019年8月WeWork申请IPO前,估值为450亿美元。仅4年后,2023年11月,WeWork申请破... 详细信息

风险投资逐渐成为创业企业重要的融资渠道,然而风险投资成功率却比较低,大多数创业企业以失败告终。WeWork作为共享办公龙头企业便是典型的失败案例之一。2019年8月WeWork申请IPO前,估值为450亿美元。仅4年后,2023年11月,WeWork申请破产保护。以WeWork为例,结合相关理论,梳理案例过程,分析其存在的问题,包括商业模式低效、公司治理缺失、公司虚假定位导致估值虚高、宏观经济环境变化。本文总结其教训和启示,包括优化商业模式、完善公司治理、清晰定位和警惕高估值泡沫,旨在为创业企业提供一定的借鉴。

关键词：风险投资创业企业 WeWork

基于行为金融视角的“庞氏骗局”研究——以广州芳村“金融茶”为例

在线全文

学校读者我要写书评

暂无评论

吉林金融研究 2024年第4期 52-57页

作者：刘海泉刘新茹刘先慧西北民族大学经济学院甘肃兰州730106

“庞氏骗局”是非法集资行为,社会影响恶劣且屡禁不止。2023年12月12日,一则“广州芳村‘金融茶’崩盘”的新闻冲上热搜。这并非广州芳村所发生的第一起“金融茶”崩盘事件。广州芳村“金融茶”被当地处置非法集资部门定义为新型“庞氏... 详细信息

“庞氏骗局”是非法集资行为,社会影响恶劣且屡禁不止。2023年12月12日,一则“广州芳村‘金融茶’崩盘”的新闻冲上热搜。这并非广州芳村所发生的第一起“金融茶”崩盘事件。广州芳村“金融茶”被当地处置非法集资部门定义为新型“庞氏骗局”。基于行为金融视角以广州芳村昌世茶公司“金融茶”崩盘事件为例进行研究,应用行为金融理论分析“庞氏骗局”中存在的问题,得出结论:一是锚定效应,二是有限理性的羊群行为,三是过度自信倾向过度交易,四是心理账户下的赌场资金效应。防范措施:一是政府层面,健全处非工作机制,加强投资风险宣传;二是社会和市场层面,推进社会信用建设,引导企业诚信经营;三是投资者层面,提升金融素养。

关键词：行为金融 “庞氏骗局” “金融茶”

在线全文

学校读者我要写书评

暂无评论

刘海泉:凡是过往皆为序章

徽商 2021年第1期 72-79,8页

作者：刘海泉安徽晶宫控股集团有限公司党委

2020年12月21日,晶宫集团位于合肥滨湖新区的总部大楼沐浴在冬日的暖阳中。一年前的这天,安徽晶宫控股集团有限公司董事长刘海泉带领着20岁的晶宫集团离开皖北小城太和县,将集团总部迁至合肥,“立足安徽、走向全国”的战略进入实质性实... 详细信息

2020年12月21日,晶宫集团位于合肥滨湖新区的总部大楼沐浴在冬日的暖阳中。一年前的这天,安徽晶宫控股集团有限公司董事长刘海泉带领着20岁的晶宫集团离开皖北小城太和县,将集团总部迁至合肥,“立足安徽、走向全国”的战略进入实质性实施阶段。

关键词：集团总部总部大楼太和县合肥滨湖新区控股集团安徽

Zircon U-Pb geochronology of the volcanic rocks from Fanchang-Ningwu volcanic basins in the Lower Yangtze region and its geological implications

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2009年第16期54卷 2895-2904页

作者： YAN Jun liu haiquan SONG ChuanZhong XU XiSheng AN YaJun liu Jia DAI LiQun School of Resources and Environmental Engineering Hefei University of Technology Hefei 230009 China State Key Laboratory for Mineral Deposits Research Department of Earth Sciences Nanjing University Nanjing 210093 China

The latest eruptions in two important Mesozoic volcanic basins of Fanchang and Ningwu located in the middle-lower reaches of the Yangtze River formed the bimodal volcanic rocks of the Kedoushan Formation and ultrapotassic volcanic rocks of the Niangniangshan Formation, respectively. The repre-sentative volcanic rocks of the two Formations were selected for LA-ICPMS zircon U-Pb dating. The results indicate that there exist a large amount of magmatic zircons as indicated by high Th/U ratios in these volcanic rocks. The weighted mean age of 21 analyses is 130.7±1.1 Ma for the Kedoushan Formation, and that of 20 analyses is 130.6±1.1 Ma for the Niangniangshan Formation. These U-Pb ages are interpreted to represent the formation times of the volcanic rocks. In combination with other known geochronological data for Mesozoic volcanic rocks from the Lower Yangtze region, it is proposed that the latest volcanic activations in the Jinniu, Luzong, Fanchang and Ningwu volcanic basins probably came to end prior to ca. 128 Ma. There is no significant time interval between the early and later volcanic activities in the Luzong and Ningwu basins, suggesting a short duration of volcanic activities and thus implying the onset of an extensional tectonic setting at about 130 Ma in the Lower Yangtze region. Integrated studies reveal that the Early Cretaceous magmatic activities and their geochronological framework in the Lower Yangtze region are a response to progressively dynamic deep processes that started with the transformation of tectonic setting from compression to extension, followed by delaminating of the lower part of the thickened lithosphere, lithospheric thinning, asthenosphere upwelling, and crust-mantle interaction.

关键词：火山岩盆地长江下游地区地质意义年代学锆石定年 Pb

Functional poly(carboxybetaine methacrylate)coated paper sensor for high efficient and multiple detection of nutrients in fruit

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2020年第5期31卷 1099-1103页

作者： Jiajie Li Tianjun Ni haiquan liu Long Wu Yingjie Pan Yong Zhao Yongheng Zhu College of Food Science and Technology Laboratory of Quality&Safety Risk Assessment for Aquatic Products on Storage and Preservation(Shanghai)Ministry of Agriculture and Shanghai Engineering Research Center of Aquatic-Product Processing&Preservation Shanghai Ocean UniversityShanghai 201306China School of Basic Medicine Xinxiang Medical UniversityXinxiang 453003China College of Bioengineering and Food Hubei University of TechnologyWuhan 430068China

Rapid and simultaneous in situ detection of multi-components is extremely crucial for the real-time monitoring of nutrients in ***,a facile and user-friendly poly(carboxybetaine methacrylate)-coated paper-based microfluidic device(pCBMA-μPAD)has been exploited to synchronously identify and semi-quantify vitamin ***,sucro se and fructose in *** pCBMA was successfully grafted from the surface of paper sensor using a co nvenient and robust method,which was confirmed by Fourier transform infrared spectroscopy(FT-IR)and X-ray photoelectron spectrometry(XPS).The superior hydrophilicity and ultra-low fouling of pCBMA endowed the pCBMA-μPAD with remarkably rapid response(3 min),high sensitivity,good linear relationship and low detection limit(LOD)(vitamin C:y=33.809+5.175 x,R^2=0.993,LOD=0.179 mmol/L;glucose:y=-0.113+30.0661 g(x),R^2=0.988,LOD=0.095 mmol/L;sucrose:y--5.334+34.858 lg(x),R^2=0.996,LOD=0.097 mmol/L;fructose:y=4.996+23.325 lg(x),R^2=0.994,LOD=0.140 mmol/L).Furthermore,satisfactory results were yielded in the detection of these nutrients in 9 fruits,which were much agreed well with those obtained by *** a portable and versatile pCBMA-μPAD will pro foundly shape the future of food analysis,especially for the assessment of food quality and nutrition in the process of agricultural production and marketing.

关键词： Paper-based microfluidic device Poly(carboxybetaine methacrylate) Vitamin C Individual sugar Fruit

Diversity analysis of acute hepatopancreatic necrosis disease-positive Vibrio parahaemolyticus strains

在线全文

学校读者我要写书评

暂无评论

Aquaculture and Fisheries 2017年第6期2卷 278-285页

作者： Bo Feng haiquan liu Meng Wang Xiaohong Sun Yingjie Pan Yong Zhao College of Food Science and Technology Shanghai Ocean UniversityShanghai 201306China Shanghai Engineering Research Center of Aquatic-Product Processing&Preservation Shanghai 201306China Laboratory of Quality&Safety Risk Assessment for Aquatic Products on Storage and Preservation(Shanghai) Ministry of AgricultureShanghai 201306China

Acute hepatopancreatic necrosis disease(AHPND),also called early mortality syndrome(EMS),has caused massive economic loss in aquaculture since *** was considered that the disease was caused by a novel type of Vibrio parahaemolyticus which harbors a large *** insecticidal Photorhabdus insect-related(pir)genes were found in the *** this study,81 isolates have been collected from a shrimp farm in Maoming,Guangdong Province,*** isolates were identified using 3 pairs of primer recently made *** the 16S rRNA gene and pir gene were ***-PCR was employed for analysis of strain diversity.12 isolates were amplified by PCR and identified as Vibrio parahaemolyticus by 16S rRNA sequence *** alignments of the pir gene showed few mutations in the 12 strains of *** 12 strains separated into 3 clusters at a cut of 90%similarity by *** virulence gene expression and toxicity profile showed differences between *** study generated comprehensive identification of pathogenic bacteria and microbial molecular resources,which will contribute to future research of AHPND.

关键词： Acute hepatopancreatic necrosis disease Challenge assay Diversity analysis