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

设计介入农品的价值提升研究

包装工程 2018年第10期39卷 8-13页

作者：皮永生段胜峰四川美术学院重庆401331

目的通过对农品变商品进行研究,探讨提升农品价值的方法,并给出具体的设计案例。方法以重庆酉阳为例,对农村地区的农品进行现状调研,找出不能体现农品价值的原因,并应用社会创新设计的相关理念进行创意设计,使农品在向商品转化的过程中... 详细信息

目的通过对农品变商品进行研究,探讨提升农品价值的方法,并给出具体的设计案例。方法以重庆酉阳为例,对农村地区的农品进行现状调研,找出不能体现农品价值的原因,并应用社会创新设计的相关理念进行创意设计,使农品在向商品转化的过程中,其价值得以提升。结论设计能调整农村社区和城市社区的关系,从而让农品商品化和品牌化,最终提升农品的价值,这对于从精准扶贫到乡村振兴的乡村建设来说具有重要意义。

关键词：农品商品价值提升

High Performance of PVA Nanocomposite Reinforced by Janus-like Asymmetrically Oxidized Graphene:Synergetic Effect of H-bonding Interaction and Interfacial Crystallization

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2022年第4期40卷 373-383页

作者： Ning Zhang Bin Zhang yong Pang Hong-sheng Yang Lu Zong yong-Xin duan Jian-Ming Zhang Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plasticsQingdao University of Science&TechnologyQingdao 266042China State Key Laboratory of Bio-fibers and Eco-textiles Qingdao UniversityQingdao 266071China

Macromolecule nanocrystal network and strong interfacial interaction are always beneficial to enhance the mechanical property of polymer-based ***(vinyl alcohol)(PVA),a typical biocompatible semicrystalline polymer,is an ideal candidate for preparing high performance polymer-based ***,the rich hydrogen bonds between PVA matrix and graphene oxide(GO)can disrupt the formation of PVA nanocrystal ***,it remains a great challenge to achieve both strong and tough PVA-GO ***,by introducing a novel Janus-like amphiphilic graphene oxide(JGO),both hydrogen bonding and interfacial crystallization have been constructed between JGO sheets and PVA *** from amphiphilic interfacial interaction and the enhanced crystal network,both PVA-JGO dried films and their swollen hydrogel films show superior mechanical properties than those of traditional PVA-GO ***-JGO dried films exhibit a 264%improvement of toughness at a JGO loading of 1 wt%.Meanwhile,the corresponding PVA-JGO swollen hydrogel films display simultaneous improvement of nearly 8 times increase of tensile strength and 20 times increase of toughness compared to traditional PVA-GO *** work indicates multiple interfacial interactions and macromolecule crystal networks can be concurrent in PVA nanocomposites by innovative modification of nanofillers,providing a new strategy to construct PVA nanocomposites with high strength and high *** integration of outstanding mechanical and swelling resistance properties on PVA-JGO nanocomposite films render their promising applications,such as packaging and toughening hydrogel materials.

关键词： Poly(vinyl alcohol) Janus-like graphene oxide Hydrogen-bonding interactions Interfacial crystallization Amphiphilicity

Tandem Approach to Functionalized Pyrrolo[3,4-α]carbazole-1,3-diones via a Pd-catalyzed Indole-to-carbazole Transformation

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2019年第4期35卷 621-626页

作者： GUO Lianghua XU Mei JIAN yong LIU sheng PAN Weidong duan Lian State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical UniversityGuiyang 550014P. R.China

A one-pot and efficient tliree-component reaction of indoles, acrylates and maleimides for the synthesis of pyrrolo[3,4-α]carbazole-1,3-dione derivatives was developed. Three C-C bonds and one ring were created in a single step via an indole-to-carbazole transformation triggered by Pd(II)-catalyzed direct C3-alkenylation of indoles.

关键词： Carbazole One-pot Tandem reaction Three-component reaction Indole-to-carbazole

Fecal microbiota transplantation in the metabolic diseases:Current status and perspectives

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

World Journal of Gastroenterology 2022年第23期28卷 2546-2560页

作者： Lie Zheng yong-Yi Ji Xin-Li Wen sheng-Lei duan Department of Gastroenterology Shaanxi Hospital of Traditional Chinese MedicineXi’an 710003Shaanxi ProvinceChina Department of Neurology Xi’an Hospital of Traditional Chinese MedicineXi’an 710021Shaanxi ProvinceChina

With the development of microbiology and metabolomics,the relationship between the intestinal microbiome and intestinal diseases has been *** microbiota transplantation(FMT),as a new treatment method,can affect the course of many chronic diseases such as metabolic syndrome,malignant tumor,autoimmune disease and nervous system *** the mechanism of action of FMT is now well understood,there is some controversy in metabolic diseases,so its clinical application may be *** transplantation is recommended by clinical medical guidelines and consensus for the treatment of recurrent or refractory Clostridium difficile infection,and has been gradually promoted for the treatment of other intestinal and extraintestinal ***,the initial results are varied,suggesting that the heterogeneity of the donor stools may affect the efficacy of *** success of FMT depends on the microbial diversity and composition of donor ***,clinical trials may fail due to the selection of ineffective donors,and not to faulty indication selection for FMT.A new understanding is that FMT not only improves insulin sensitivity,but may also alter the natural course of type 1 diabetes by modulating *** this review,we focus on the main mechanisms and deficiencies of FMT,and explore the optimal design of FMT research,especially in the field of cardiometabolic diseases.

关键词： Fecal microbiota transplantation Metabolic diseases Inflammatory bowel disease Type 1 diabetes Metabolic syndrome

Prediction of critical forging penetration efficiency for 06Cr19Ni9NbN steel by dynamic recrystallization

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

Journal of Iron and Steel Research International 2017年第6期24卷 649-653页

作者： yong-xing Jiao Jian-sheng Liu Xing-wang duan Xiao-hua Zheng Wen-wu He College of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan 030024 Shanxi China

In order to determine the critical forging penetration efficiency （FPE） of 06Crl9NigNbN steel, a new model was presented to describe critical FPE, which is significant to optimize the steel forging process. The plane strain compression tests were conducted to obtain the model and confirm its va- lidity. The results indicated that the dynamic recrystallization （DRX） volume fraction increases and the grain size decreases with the rise of reduction ratio. Meanwhile, the compression process was simulated by DEFORM software. The tensile tests were conducted and the results demonstrated that the mechanical properties gradually become stable when the reduction ratio increases to 30%, 34% and 40% at 1200, 1 100 and 1000 ℃, respectively. The calculated results based on this new model are consistent with experimental results, indicating that the model is suitable to predict the critical FPE for the steel.

关键词： Forging penetrationefficiencyDynamic recrystallizationMicrostructure evolutionMechanical property

A Note about Minimal Hypercones

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2021年第11期37卷 1794-1802页

作者： yong sheng ZHANG School of Mathematical Sciences&IAS Tongji UniversityShanghai 200092P.R.China

This short note is concerned with a measure version criterion for hypersurfaces to be *** natural flows and associated reflections for many minimal hypercones,including minimal isoparametric hypercones and area-minimi... 详细信息

关键词： Minimal hypercone measure invariant flow foliation

First-principles calculations of optical properties of Mg_2Pb

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2014年第2期57卷 233-238页

作者： duan yongHua SUN yong School of Material Science and Technology Kunming University of Science and Technology Key Lab of Advanced Materials of Yunnan Province Kunming University of Science and Technology

Based on the density functional theory （DFT）, the electronic structures and optical properties of Mg2Pb are calculated by using the local density approximation （LDA） and plane wave pseudo-potential method. The calculation results show that the indirect band gap width of Mg2Pb is 0.02796 eV. The optical properties of MgzPb have isotropic characteristics, the static dielectric function of Mg2Pb is ε1（0） = 10.33 and the refractive index is n0 = 3.5075. The maximum absorption coefficient is 4.8060×10^5 cm-1. The absorption in the photon energy range of 25-40 eV approaches to zero, shows the optical colorless and transparent behaviors.

关键词： first-principles Mg2Pb electronic structure optical properties

Prediction of users online purchase behavior based on selective ensemble learning

在线全文

学校读者我要写书评

暂无评论

High Technology Letters 2023年第2期29卷 206-212页

作者：谭惠 duan yong School of In formation Science Engineering Shenyang University of TechnologyShenyang 110870P.R.China

A probabilistic multi-dimensional selective ensemble learning method and its application in the prediction of users' online purchase behavior are studied in this ***, the classifier is integrated based on the dimension of predicted probability, and the pruning algorithm based on greedy forward search is obtained by combining the two indicators of accuracy and *** the pruning algorithm is integrated into the Stacking ensemble method to establish a user online shopping behavior prediction model based on the probabilistic multi-dimensional selective ensemble ***, the research method is compared with the prediction results of individual learners in ensemble learning and the Stacking ensemble method without *** experimental results show that the proposed method can reduce the scale of integration, improve the prediction accuracy of the model, and predict the user's online purchase behavior.

关键词： users'online purchase behavior Stacking selective ensemble ensemble pruning feature engineering

Thermodynamics properties and thermal conductivity of Mg_2Pb at high pressure

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2013年第10期56卷 1854-1860页

作者： duan yongHua SUN yong Faculty of Material Science and Technology Kunming University of Science and Technology Key Lab of Advanced Materials of Yunnan Province Kunming University of Science and Technology

The thermodynamics properties and thermal conductivity of Mg2Pb at high pressures have been calculated by *** enthalpy of formation and heat capacity obtained at 0 GPa are in good agreement with the experiments and other theoretical *** thermal conductivity and coefficient of thermal expansion of Mg2 Pb at high pressure were *** thermal conductivity presents a second-order polynomial with *** calculated thermal conductivity of Mg2Pb indicates that it is suitable to be used as thermal conductor at 0 K.

关键词： thermodynamics properties thermal conductivity first-principles Mg2Pb