检索结果-南通市图书馆

Ellagic Acid Enhances Antioxidant System Activity and Maintains the Quality of Strawberry Fruit during Storage

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2024年第1期93卷 15-28页

作者： Jian Chen Jing Zhang gang pan Dandan Huang Shuhua Zhu College of Chemistry and Material Science Shandong Agricultural UniversityTaian271018China Agriculture and Rural Bureau of Penglai District Yantai265699China Laiyang Inspection and Testing Center Yantai265299China

Ellagic acid(EA)is a natural antioxidant,widely present in a lot of forms’soft fruits,nuts,and other plant tissues,and helpful for promoting human health;however,its protective effect on postharvest fruit and improving the quality index of postharvest fruit have rarely been *** this experiment,the strawberries were soaked in 0,100,200,300,400,and 500 mg L^(−1) EA,respectively,and the influential EA on fruit quality and the antioxidant system of strawberries were *** with the control,EA treatment can reduce the browning degree and rotting rate of strawberry fruit during storage and augment the soluble solid content(SSC).EA treatment can also increase the content of related stuff and enzyme activity in antioxidant systems;the gene expression level of polyphenol oxidase(PPO)in strawberries treated with EA was always down-regulated,correspondingly,the expression of other antioxidant enzyme genes was *** the strawberry fruits treated with EA of different concentrations,300 mg L^(−1) EA had the best effect in the process of strawberry *** results suggested that the proper concentration of exogenous EA at 300 mg L−1 could maintain strawberries’quality and enhance the antioxidant system by improving the activities of antioxidative enzymes and the ascorbateglutathione(AsA-GSH)cycle during storage.

关键词： Strawberry ellagic acid antioxidative enzyme AsA-GSH cycle storage

色季拉山石生藓类多样性及优势种成土与持水能力

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

生态学杂志 2024年第6期43卷 1596-1603页

作者：董营张首超卓嘎巴永潘刚王瑞红西藏农牧学院高原生态研究所西藏林芝860000 西藏高原森林生态教育部重点实验室西藏林芝860000 西藏林芝高山森林生态系统国家野外科学观测研究站西藏林芝860000 西藏自治区高寒植被生态安全重点实验室西藏林芝860000

通过野外调查和室内实验,对西藏林芝市色季拉山石生苔藓植物多样性进行了分析,并对该区域内的3种优势种的生物量、成土量、持水量等进行了测定。结果表明:石生藓类共8科12属16种,其中灰藓科(Hypnaceae)、羽藓科(Thuidiaceae)和曲尾藓科(... 详细信息

通过野外调查和室内实验,对西藏林芝市色季拉山石生苔藓植物多样性进行了分析,并对该区域内的3种优势种的生物量、成土量、持水量等进行了测定。结果表明:石生藓类共8科12属16种,其中灰藓科(Hypnaceae)、羽藓科(Thuidiaceae)和曲尾藓科(Dicranaceae)为优势科,优势种为毛梳藓(Ptilium crista-castrensis)、棕色曲尾藓(Dicranum fuscescens)和锦丝藓(Actinothuidium hookeri);西藏色季拉山石生藓类优势种生物量为110.7~763.6 g·m^(-2),成土量为234.9~9063.3 g·m^(-2),最大持水量2164.5~8514.5 g·m^(-2),最大持水率169%~400%、自然持水量1984.74~6764.5 g·m^(-2)、自然持水率95%~318%。色季拉山石生藓类植物具有较好的成土和持水作用,可以有效防治水土流失,对保持水土具有重要意义。

关键词：色季拉山石生藓类植物持水作用成土功能

同方期刊数据库

苔藓植物对急尖长苞冷杉种子萌发及幼苗数量的影响

在线全文

学校读者我要写书评

暂无评论

种子 2024年第5期43卷 131-136页

作者：卓嘎巴永董营潘刚王瑞红西藏农牧学院高原生态研究所/西藏高原森林生态教育部重点实验室/西藏林芝高山森林生态系统国家野外科学观测研究站/西藏自治区高寒植被生态安全重点实验室西藏林芝860000

为探究苔藓植物对冷杉种子萌发及幼苗生长的影响机制,通过野外调查和室内试验,分析了不同处理方式及不同等级苔藓植物厚度对急尖长苞冷杉种子萌发及幼苗数量的影响。野外调查结果表明,对照组种子数量>除去苔藓处理种子数量>除去苔藓并... 详细信息

为探究苔藓植物对冷杉种子萌发及幼苗生长的影响机制,通过野外调查和室内试验,分析了不同处理方式及不同等级苔藓植物厚度对急尖长苞冷杉种子萌发及幼苗数量的影响。野外调查结果表明,对照组种子数量>除去苔藓处理种子数量>除去苔藓并整地处理种子数量;天然更新幼苗数量表现为对照组>除去苔藓并整地处理>除去苔藓处理;苔藓厚度对种子萌发影响表现为Ⅰ级>Ⅱ级>Ⅲ级,对幼苗数量的影响表现为Ⅱ级>Ⅰ级>Ⅲ级。室内试验分析了不同处理方式下苔藓植物对急尖长苞冷杉种子发芽率、发芽势、发芽指数及冷杉幼苗生长的影响,结果表明,新鲜与烘干方式下的苔藓植物对冷杉种子的萌发有较为明显的抑制作用,但烘干状态下的影响较新鲜状态下要小。

关键词：苔藓植物急尖长苞冷杉种子萌发幼苗

基于百度飞桨平台的计算机视觉课程改革与实践

在线全文

学校读者我要写书评

暂无评论

高教学刊 2024年第2期10卷 10-14页

作者：潘刚丁进孙迪天津大学天津300350 百度在线网络技术(北京)有限公司北京100085 天津科技大学天津300222

计算机视觉是当前计算机和人工智能领域的热门方向,但前沿课程内容在算法、算力和数据方面的需求,使得传统授课模式无法满足对当前学生实践能力培养的需求。在教育部产学合作协同育人的背景下,该文从课程核心内容、前沿技术扩展、先进... 详细信息

计算机视觉是当前计算机和人工智能领域的热门方向,但前沿课程内容在算法、算力和数据方面的需求,使得传统授课模式无法满足对当前学生实践能力培养的需求。在教育部产学合作协同育人的背景下,该文从课程核心内容、前沿技术扩展、先进实验设计和考核方式改革等多方面,开展课程的革新与探索,并在实际教学活动详解的基础上,验证教学质量和学生综合能力的提升,为计算机视觉相关课程提供参考。

关键词：计算机视觉飞桨平台新工科产学合作协同育人

3D自支撑钴基硫化物电极电催化还原硝酸盐特性研究

在线全文

学校读者我要写书评

暂无评论

环境科学学报 2024年第5期44卷 92-101页

作者：肖晓罗章奕何玮钰李安旎陈浩赵辉孙东潘纲广东海洋大学化学与环境学院湛江524088 海岸带环境保护与生态修复中心湛江524088 约克圣约翰大学人文学院英国YO317EX

针对水体硝酸盐污染严重的问题,本研究以泡沫镍(NF)为基底材料,采用恒电流沉积法制备了3D自支撑钴基硫化物电极—CoxS/NF,用于电催化还原硝酸盐.重点研究了CoxS/NF电极制备参数和电解工作条件对硝酸盐去除的影响规律及其硝酸盐还原机制... 详细信息

针对水体硝酸盐污染严重的问题,本研究以泡沫镍(NF)为基底材料,采用恒电流沉积法制备了3D自支撑钴基硫化物电极—CoxS/NF,用于电催化还原硝酸盐.重点研究了CoxS/NF电极制备参数和电解工作条件对硝酸盐去除的影响规律及其硝酸盐还原机制.研究结果表明,在硝酸盐初始浓度为50 mg·L^(-1)(以NO_(3)^(-)N计),工作电流为4.0 mA,反应时间为180 min的条件下,硫脲浓度为0.8 mol·L^(-1)和沉积电流为0.7 mA条件下制备的CoxS/NF电极(2 cm×2 cm)表现出最佳的硝酸盐去除效果,其硝酸盐去除率为79.0%,N2选择性高达93.6%.该过程符合伪一级动力学反应方程,反应速率常数为0.0077 min^(-1).CoxS/NF电极还表现出优异的Cl^(-)耐受性和重复使用性.循环伏安、计时电流和塔菲尔测试结果表明超薄纳米片CoxS的引入能有效增加电极与硝酸根离子的接触面积,改善了CoxS/NF电极的硝酸盐电催化活性和稳定性.

关键词：电催化还原电沉积钴基硫化物电极硝酸盐 N_(2)选择性

吴茱萸敷脐对腹部手术后患者胃肠运动功能和胃肠激素分泌的影响

在线全文

学校读者我要写书评

暂无评论

安徽中医药大学学报 2024年第2期43卷 28-31页

作者：李欣沈毅潘刚彭辉利辛县中医院安徽利辛236700 安徽中医药大学第一附属医院安徽合肥230031

目的探讨吴茱萸敷脐对腹部手术患者术后胃肠运动功能和胃肠激素分泌的影响。方法将接受腹部手术的80例患者随机分为对照组和观察组,每组40例。观察组术后在对照组常规治疗的基础上予以吴茱萸敷脐治疗,比较两组患者术后胃肠运动功能、胃... 详细信息

目的探讨吴茱萸敷脐对腹部手术患者术后胃肠运动功能和胃肠激素分泌的影响。方法将接受腹部手术的80例患者随机分为对照组和观察组,每组40例。观察组术后在对照组常规治疗的基础上予以吴茱萸敷脐治疗,比较两组患者术后胃肠运动功能、胃肠激素分泌和营养状况恢复情况。结果观察组患者腹部术后肛门排气时间、排便时间、肠鸣音恢复时间以及进食时间均较对照组明显缩短(P<0.05);观察组患者术后血清胃泌素水平、胃动素水平均显著高于对照组(P<0.05)。结论腹部手术后给予吴茱萸敷脐,能够促进患者胃肠功能恢复,其作用机制可能与其调节胃肠激素分泌有关。

关键词：吴茱萸敷脐腹部手术胃肠运动胃肠激素

Pyramid-VAE-GAN:Transferring hierarchical latent variables for image inpainting

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2023年第4期9卷 827-841页

作者： Huiyuan Tian Li Zhang Shijian Li Min Yao gang pan College of Computer Science and Technology Zhejiang UniversityHangzhou 310027China Advanced Technology Research Institute Zhejiang UniversityHangzhou 310027China

Significant progress has been made in image inpainting methods in recent ***,they are incapable of producing inpainting results with reasonable structures,rich detail,and sharpness at the same *** this paper,we propose the Pyramid-VAE-GAN network for image inpainting to address this *** network is built on a variational autoencoder(VAE)backbone that encodes high-level latent variables to represent complicated high-dimensional prior distributions of *** prior assists in reconstructing reasonable structures when *** also adopt a pyramid structure in our model to maintain rich detail in low-level latent *** avoid the usual incompatibility of requiring both reasonable structures and rich detail,we propose a novel cross-layer latent variable transfer *** transfers information about long-range structures contained in high-level latent variables to low-level latent variables representing more detailed *** further use adversarial training to select the most reasonable results and to improve the sharpness of the *** experimental results on multiple datasets demonstrate the superiority of our *** code is available at https://***/thy960112/Pyramid-VAE-GAN.

关键词： image inpainting variational autoencoder(VAE) latent variable transfer(LTN) pyramid structure generative model

Dynamic road crime risk prediction with urban open data

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

Frontiers of Computer Science 2022年第1期16卷 113-125页

作者： Binbin ZHOU Longbiao CHEN Fangxun ZHOU Shijian LI Sha ZHAO gang pan College of Computer Science Zhejiang UniversityHangzhou310027China Fujian Key Laboratory of Sensing and Computing for Smart Cities School of Information Science and EngineeringXiamen UniversityXiamen361005China

Crime risk prediction is helpful for urban safety and citizens’life ***,existing crime studies focused on coarse-grained prediction,and usually failed to capture the dynamics of urban *** key challenge is data sparsity,since that 1)not all crimes have been recorded,and 2)crimes usually occur with low *** this paper,we propose an effective framework to predict fine-grained and dynamic crime risks in each road using heterogeneous urban ***,to address the issue of unreported crimes,we propose a cross-aggregation soft-impute(CASI)method to deal with possible unreported ***,we use a novel crime risk measurement to capture the crime dynamics from the perspective of influence propagation,taking into consideration of both time-varying and location-varying risk *** on the dynamically calculated crime risks,we design contextual features(i.e.,POI distributions,taxi mobility,demographic features)from various urban data sources,and propose a zero-inflated negative binomial regression(ZINBR)model to predict future crime risks in *** experiments using the real-world data from New York City show that our framework can accurately predict road crime risks,and outperform other baseline methods.

关键词： crime prediction road crime risk urban computing data sparsity zero-inflated negative binomial regression

Chro-austempering treatment of a medium-carbon high-strength bainitic steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2023年第2期30卷 317-327页

作者： Man Liu Jun-yu Tian Feng Cai Cheng-gang pan Guang Xu The State Key Laboratory of Refractories and Metallurgy The Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of EducationThe Collaborative Innovation Center for Advanced Steels of Ministry of EducationWuhan University of Science and TechnologyWuhan430081HubeiChina Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan430081HubeiChina

The integrated processing of chromizing and austempering(termed chro-austempering)treatments was *** microstructure and properties of a medium-carbon high-strength bainitic steel treated by chro-austempering treatments were investigated by metallography,scanning vibrating electrode technique,electrochemical workstation,and microhardness *** results show that the high-strength bainitic steel with carbide-free bainite as matrix and the chromized layers on surfaces was successfully fabricated by chro-austempering *** hardness of surface layers was about 3.5 times that of the bainite ***,the corrosion started from exposed bainitic matrix and proceeded along the depth direction,testifying that the surface corrosion resistance was significantly improved by chro-austempering treatment due to the formation of Cr_(7)C_(3)and(Cr,Fe)7_(7)C_(3)on the surface.

关键词： Chro-austempering Chromizing Austempering Bainitic transformation Corrosion resistance Hardness High-strength bainitic steel