检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

甜樱桃果实品质研究进展

中国果树 2024年第2期 6-11页

作者：陈瑶才丰艾佳音何明莉吴敏张琪静辽宁省果树科学研究所营口115009 沈阳农业大学

为提高甜樱桃果实品质,阐述了甜樱桃果实在发育成熟过程中外观品质(果实大小、果皮颜色)和内在品质(糖酸、激素和质地)的性状变化,分析了影响果实品质形成的遗传因素(品种、砧木)和环境因素(光照、温度、水分、养分),总结了提高甜樱桃... 详细信息

为提高甜樱桃果实品质,阐述了甜樱桃果实在发育成熟过程中外观品质(果实大小、果皮颜色)和内在品质(糖酸、激素和质地)的性状变化,分析了影响果实品质形成的遗传因素(品种、砧木)和环境因素(光照、温度、水分、养分),总结了提高甜樱桃果实品质的栽培管理研究进展,对提高甜樱桃果实品质的研究方向进行了展望。

关键词：甜樱桃外观可溶性糖有机酸矿质营养研究展望

Synthesis and AO Resistant Properties of Novel Polyimide Fibers Containing Phenylphosphine Oxide Groups in Main Chain

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2019年第1期37卷 59-67,1-3页

作者： Yong Zhao Hong Gao Guo-min Li Fang-Fang Liu Xue-min dai Zhi-Xin Dong Xue-Peng Qiu Polymer Composites Engineering Laboratory Changchun Institute of Applied Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences China Academy of Space Technology

A series of co-polyimide(PI)fibers containing phenylphosphine oxide(PPO)group were synthesized by incorporating the bis(4-aminophenoxy)phenyl phosphine oxide(DAPOPPO)monomer into the PI molecular chain followed by dry-jet wet *** effects of DAPOPPO molar content on the atomic oxygen(AO)resistance of the fibers were investigated *** the AO fluence increased from 0to 3.2×1020the mass loss of the fibers showed the dependence on DAPOPPO molar content in co-PI *** PI fiber containing 40%DAPOPPO showed lower mass loss compared to those containing 0%and 20%*** higher AO fluence,the higher DAPOPPO content gave rise to dense carpet-like surface of *** results indicated that the passivated phosphate layer was deposited on the fiber surface when exposed to AO,which effectively prevented fiber from AO *** the DAPOPPO content increasing from 0%to 40%,the retentions of tensile strength and initial modulus for the fibers exhibited obvious growth from 44%to 68%,and 59%to 70%,after AO exposure with the fluence of 3.2×1020The excellent AO resistance benefits the fibers for application in low Earth orbit as flexible construction components.

关键词： Polyimide fibers Bis(4-aminophenoxy)phenyl phosphine oxide(DAPOPPO) Dry-jet wet spinning AO resistance

在线全文

学校读者我要写书评

暂无评论

基于多元统计分析对芥菜营养品质的综合评价

中国蔬菜 2024年第1期 29-37页

作者：李建忠戴昀叶鑫雨李国亮章时蕃李菲张慧袁凌云陈国户汪承刚张淑江中国农业科学院蔬菜花卉研究所蔬菜生物育种全国重点实验室北京100081 安徽农业大学园艺学院安徽省园艺作物育种工程实验室安徽合肥230036

为建立芥菜营养品质标准评价体系,筛选优良品质的芥菜品种,采用多元统计分析方法(相关性分析、主成分分析、模糊数学隶属函数分析、聚类分析),对14份芥菜材料的干物质、VC、粗蛋白、粗纤维、葡萄糖、果糖、草酸、苹果酸、柠檬酸9个品质... 详细信息

为建立芥菜营养品质标准评价体系,筛选优良品质的芥菜品种,采用多元统计分析方法(相关性分析、主成分分析、模糊数学隶属函数分析、聚类分析),对14份芥菜材料的干物质、VC、粗蛋白、粗纤维、葡萄糖、果糖、草酸、苹果酸、柠檬酸9个品质指标进行综合评价。结果表明:14份芥菜材料的9个品质指标均存在显著差异,变异系数在16.46%~66.67%之间,说明不同芥菜材料单一指标间的差异较大。主成分分析综合品质得分较高的是1917012、1917396、1917381,较低的是1917351、祥瑞182;通过模糊数学隶属函数分析和聚类分析评价,营养品质优良的芥菜材料为1917396、1917397、1917381,较差的为1917152、祥瑞182。综合来看,芥菜材料1917396和1917381表现优异,营养品质好。这2份材料的干物质、VC等含量较高,也证明该评价体系可以极大的消除单一指标的差异。

关键词：芥菜营养品质多元统计分析综合评价

维普期刊数据库博看期刊

电感耦合等离子体原子发射光谱法用于锰矿石中碳酸锰、氧化锰和硅酸锰的物相分析

在线全文

学校读者我要写书评

暂无评论

冶金分析 2024年第1期44卷 81-86页

作者：姜云周鑫陈明桂夏传波山东省地质科学研究院山东省金属矿产成矿地质过程与资源利用重点实验室

锰矿石中含锰矿物种类繁多、分类复杂，但目前锰矿石物相分析手续繁琐，流程不统一，缺少操作细节描述。实验选择了不同矿区、不同类型含量的锰矿石，通过单矿物实验选择浸取剂，建立了50 g/L硝酸铝沸水浴60 min浸取碳酸锰，30 g/L硫酸... 详细信息

锰矿石中含锰矿物种类繁多、分类复杂，但目前锰矿石物相分析手续繁琐，流程不统一，缺少操作细节描述。实验选择了不同矿区、不同类型含量的锰矿石，通过单矿物实验选择浸取剂，建立了50 g/L硝酸铝沸水浴60 min浸取碳酸锰，30 g/L硫酸羟胺-1%(V/V)硫酸沸水浴60 min浸取氧化锰，残渣经酸分解得到硅酸锰，使用电感耦合等离子体原子发射光谱法(ICP-AES)测定处理的溶液中锰，建立了锰矿石化学物相分析方法。方法的检出限分别为(以锰计):碳酸锰相0.000 3%,氧化锰相0.000 5%,硅酸锰相0.000 3%。按照实验方法测定1个碳酸锰原矿和1个氧化锰原矿，测定结果的相对标准偏差(RSD,n=12)小于5.0%,满足DZ/T 0130.3—2006《地质矿产实验室测试质量管理规范》的要求。实验方法用于测定锰矿石化学物相分析标准物质GBW(E)070256(碳酸锰矿)和GBW(E)070258(氧化锰矿),主相态测定结果的相对误差(RE)小于1%,其他相态相对误差小于10%,同样满足DZ/T 0130.3—2006的要求。

关键词：锰矿石物相分析碳酸锰氧化锰硅酸锰电感耦合等离子体原子发射光谱法(ICP-AES)

接驳地铁的共享自动驾驶汽车动态合乘匹配研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国公路学报 2024年第6期37卷 288-301页

作者：霍月英张越李晓娟陈国庆内蒙古大学交通学院内蒙古呼和浩特010070 内蒙古大学数学科学学院内蒙古呼和浩特010021 北京联合大学城市轨道交通与物流学院北京100101

为了实现共享自动驾驶汽车(Shared Autonomous Vehicles,SAV)和地铁的整合,提出采用SAV作为地铁“第一公里”(First Mile,FM)和“最后一公里”(Last Mile,LM)的接驳方式。构建了动态合乘匹配系统以厘清接驳地铁的SAV合乘的框架及运行规... 详细信息

为了实现共享自动驾驶汽车(Shared Autonomous Vehicles,SAV)和地铁的整合,提出采用SAV作为地铁“第一公里”(First Mile,FM)和“最后一公里”(Last Mile,LM)的接驳方式。构建了动态合乘匹配系统以厘清接驳地铁的SAV合乘的框架及运行规则,系统输入为路网数据、SAV数据(位置、载客状态等)、出行者数据(起点、终点等),输出为出行匹配结果、合乘路径。建立了出行路径模型和出行匹配模型来实现系统的合乘匹配功能。出行路径模型考虑出行者绕行时间最小化进行建模,可得到任意2名出行者合乘时的最优出行路径,用于出行匹配模型的参数计算。出行匹配模型协同考虑出行者服务质量和运营商利益以及SAV与地铁时刻表的联合优化进行建模,可得到最优出行匹配方案,包括人与SAV匹配、人与人匹配。选取纽约曼哈顿地铁进行4种出行需求(2160、4320、6480、8640次·h-1)的算例分析。结果表明:在出行需求2160、4320次·h-1的FM和LM出行、出行需求6480次·h-1的LM出行中,出行者平均等待时间最大值为1.06 min,出行者平均绕行时间最大值为1.11 min,出行者平均匹配时长最长为46.09 s,每小时最多可为运营商节约877.24 km的车辆行驶里程,匹配率最高可达61.67%,系统平均求解时长最长为2.09 s;表明所建系统和模型具有高效性和稳定性。

关键词：交通工程共享自动驾驶汽车地铁接驳动态合乘匹配路径选择

Pt-Ni core-shell structure with Pt-skin and electronic effect on catalytic performance

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2023年第11期63卷 260-267页

作者： Chong Yao Dandan Ma Jie Luo Yixin chen min Tian Haoxuan Xie Chunshan Lu Feng Feng Xiaoliang Xu Qingtao Wang Qunfeng Zhang Xiaonian Li State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology College of Chemical EngineeringZhejiang University of TechnologyHangzhou 310014China

In order to improve the catalytic performance of the nitrobenzene hydrogenation rearrangement to prepare p-aminophenol,a bimetallic Pt-Ni/C(PNC)catalyst was *** advantage of the synergistic effect of Ni and Pt to enhance product selectivity and catalytic performance stability,the electrons in Ni are moved to Pt by the electron effect,which affects the catalyst’s ability to activate H_(2)as well as the amount of hydrogen ***,due to the strong Pt(5d)-Ni(3d)coupling effect,Ni can effectively maintain Pt stability in the acidic system and reduce Pt *** stability of the PNC can be found to be greatly enhanced compared to the Pt/C(PC)catalyst,and p-aminophenol selectivity is greatly enhanced,showing excellent catalytic performance.

关键词： Nitrobenzene p-Aminophenol Pt-Ni/C bimetallic catalyst Electronic effect Pt(5d)-Ni(3d)coupling

Inter-comparison of seasonal variability and nonlinear trend between AERONET aerosol optical depth and PM10 mass concentrations in Hong Kong

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2014年第4期57卷 2606-2615页

作者： HE JingJing ZHANG min chen XianYao WANG Meng Key Laboratory of Data Analysis and Applications State Oceanic Administration the First Institute of OceanographyState Oceanic Administration

Here we used Empirical Mode Decomposition(EMD) method to study seasonal variability and nonlinear trend of corrected AERONET Aerosol Optical Depth(AOD/Hi) and corrected PM10 mass concentrations(PM10×f(RH)) in Hong Kong during 2005–2011. AOD/Hi is highly correlated with PM10×f(RH) in semi-annual and annual time scales(with correlation coefficient 0.67 for semi-annual and 0.79 for annual components, 95% confidence interval). On the semi-annual scale, both AOD/Hi and PM10×f(RH) can capture the two maxima in March and October, respectively, with much stronger amplitude in March probably due to the long-range transport of dust storm. On the annual cycle, the AOD/Hi and PM10×f(RH), which are negatively correlated with the precipitation and solar radiation, vary coherently with the maxima in February. This annual peak occurs about one month earlier than the first peak of the semi-annual variability in March, but with only half amplitude. During 2005–2011, both AOD/Hi and PM10×f(RH) exhibit the pronounced decreasing trend with the mean rate of 14 μg m–3 per year for PM10×f(RH), which reflects the significant effects of the air pollution control policy in Hong Kong during the past decade. The nonlinear trend analysis indicates that the decreasing of PM10×f(RH) is slower than that of AOD/Hi when the AOD/Hi is less than 0.44 but becomes faster when the AOD/Hi exceeds 0.44. These results illustrate that the AERONET AOD can be used quantitatively to estimate local air-quality variability on the semi-annual, annual, and long-term trend time scales.

关键词：气溶胶光学厚度线性趋势质量浓度 PM10 季节性变化香港经验模式分解污染控制政策

参松养心胶囊中4种成分在大鼠血浆中药动学研究

在线全文

学校读者我要写书评

暂无评论

中南药学 2024年第7期22卷 1732-1737页

作者：马晨阳符子轩王哲永赵旻赵春杰沈阳药科大学药学院沈阳110016 辽宁省肿瘤医院沈阳110042

目的考察参松养心胶囊中巴马汀、小檗碱、五味子甲素、丹参酮ⅡA在大鼠血浆中的药动学过程。方法大鼠以0.43 g·kg^(-1)药物剂量给予参松养心胶囊灌胃,于不同时间点采血。以卡马西平为内标,建立LC-MS/MS法测定大鼠血浆中的巴马汀、小檗... 详细信息

目的考察参松养心胶囊中巴马汀、小檗碱、五味子甲素、丹参酮ⅡA在大鼠血浆中的药动学过程。方法大鼠以0.43 g·kg^(-1)药物剂量给予参松养心胶囊灌胃,于不同时间点采血。以卡马西平为内标,建立LC-MS/MS法测定大鼠血浆中的巴马汀、小檗碱、五味子甲素、丹参酮ⅡA的血药浓度并计算主要药动学参数。结果巴马汀、小檗碱、五味子甲素、丹参酮ⅡA在各自浓度范围内与峰面积比值线性关系良好,精密度,准确度,提取回收率,基质效应结果均符合测定要求。并根据PKSolver分别计算出以上4种成分药动学参数t_(max)、C_(max)、t1/2、AUC0~t、AUC0~inf值。结论所建立的LC-MS/MS分析方法,可灵敏、快速、准确地应用于大鼠血浆中参松养心胶囊的主要活性成分,为参松养心胶囊的临床研究和合理用药提供参考。

关键词：参松养心胶囊 LC-MS/MS 药动学

Advances in Journal of Geriatric Cardiology over the course of a decade

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2020年第12期17卷 733-739页

作者： Qiang WU Lai-Fu LI Yun-dai chen Institute of Geriatric Cardiology Chinese PLA General HospitalBeijingChina Department of Cardiology Chinese PLA General HospitalBeijingChina Journal of Geriatric Cardiology Editorial Office Chinese PLA General HospitalBeijingChina

The Journal of Geriatric Cardiology(JGC,ISSN 1671-5141/CN 11-5329/R)is a monthly,open-access,international,and peer-reviewed journal sponsored and published by the Institute of Geriatric Cardiology affiliated with Chinese PLA General *** was created in 2004 by ***-Wen WANG,and as the current editor-in-chief,***-dai chen has been involved in JGC for eight years and has achieved impressive advancements.

关键词： Bibliometrics Citation analysis Journal of Geriatric Cardiology Peer review Research hotspots