检索结果-南通市图书馆

Science China(Life Sciences) 2022年第10期65卷 2128-2130页

作者： qingqing hou Jing Wang Xuewei Chen State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China and Rice Research Institute Sichuan Agricultural University at WenjiangChengdu 61l130China

Over the past decades,crop breeding has undergone genetic improvement through semi-dwarfness,heterosis,and ideal plant architecture,which increases yield tremendously to feed the growing population worldwide.However,crop breeding is still largely constrained by tradeoffs among different agronomic traits,such as negative correlation between seed size and number.

关键词： breeding crops dwarf

Cell wall associated immunity in plants

在线全文

学校读者我要写书评

暂无评论

Stress Biology 2021年第1期1卷 23-37页

作者： Jiangxue Wan Min He qingqing hou Lijuan Zou Yihua Yang Yan Wei Xuewei Chen State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China Sichuan Agricultural University at WenjiangChengdu 611130SichuanChina Ecological Security and Protection Key Laboratory of Sichuan Province Mianyang Normal UniversityMianyang 621000SichuanChina

The plant cell wall is the first physical and defensive barrier against pathogens.The plant cell wall usually undergoes dynamic remodeling as an immune response to prevent infection by pathogens.In this review,we summarize advances on relationship between cell wall and immunity in plants.In particular,we outline current progresses regarding the regulation of the cell wall components,including cellulose,hemicellulose,pectin and lignin,on plant disease resistance.We also discuss the impacts of cell wall-derived cellodextrin,oligogalacturonic acid and xyloglucan/xylan oligosaccharides as potent elicitors or signal molecules to trigger plant immune response.We further propose future studies on dissecting the molecular regulation of cell wall on plant immunity,which have potentials in practical application of crop breeding aiming at improvement of plant disease resistance.

关键词： Cell wall Oligosaccharides Elicitor Plant immunity Disease resistance

Preparation and Applications of Soybean Residue CNF Films

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

Paper And Biomaterials 2019年第3期4卷 45-53页

作者： Peiyi Li Hezhen Liu qingqing hou Yumeng Wang Xinping Li College of Bioresources Chemical and Materials Engineering National Demonstration Center for Experimental Light Chemistry Engineering EducationShaanxi University of Science and TechnologyXi’anShaanxi Province710021China State Key Lab of Pulp and Paper Engineering South China University of TechnologyGuangzhou Guangdong Province510640China Key Laboratory of Paper Based Functional Materials of China National Light Industry Xi’an Shaanxi Province710021China Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development Xi’anShaanxi Province710021China

In this study, soybean residues were treated with HCl and soybean residue cellulose was extracted, which was used to prepare cellulose nanofiber (CNF) using the high-pressure homogenization method. The maximum yield of CNF, the reaction temperature, reaction time, and HCl concentration were optimized. The optimum HCl concentration for acid treatment was 6%, the reaction time was 60 min, the reaction temperature was 80℃, and the maximum yield of soybean residue cellulose was 78.8%. The different CNF films were then prepared;the color, mechanical property, and light transmittance of the CNF films were studied. Compared to the properties of the CNF film prepared with the soybean residue cellulose by high-pressure homogenization 15 times (HGT-15 film), the mechanical properties of the CNF film with soybean residue cellulose by decolorizing treatment decreased, but the light transmittance increased. The film prepared by adding HGT- 15 CNF to whey protein was investigated for its mechanical property, light transmittance, and solubility. Unlike the pure whey protein film, addition of 2.0% CNF to the whey protein enhanced the mechanical property and water vapor transmission rate (WVT) of the film. With the increase in CNF content, the solubility of the whey protein film decreased, and then stabilized.

关键词： acid treatment soybean residues CNF whey protein film

Effect of High Pressure Homogenization Treatment on Structure and Properties of Soybean Residue Cellulose Nanofibers

在线全文

学校读者我要写书评

暂无评论

Paper And Biomaterials 2019年第4期4卷 37-44页

作者： Peiyi Li Yumeng Wang Binyao Zhou qingqing hou Hezhen Liu Haozhe Lei Boxing Jian Xinping Li College of Bioresources Chemical and Materials Engineering National Demonstration Center for Experimental Light Chemistry Engineering EducationShaanxi University of Science and TechnologyXi’anShaanxi Province710021China State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhouGuangdong Province510640China Department of Chemical and Paper Engineering Western Michigan UniversityKalamazooMichigan49008USA Key Laboratory of Paper Based Functional Materials of China National Light Industry Xi’anShaanxi Province710021China Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development Xi’anShaanxi Province710021China

To reduce the adverse effects of non-cellulose materials on subsequent homogenization,the effects of a high-pressure homogenization treatment on the structure and properties of cellulose nanofibers(CNF)prepared by acid treatment of soybean residue were studied.The effects of the number of homogenization step on the microfibrillation degree,crystalline structure and mechanical properties of the soybean residue were analyzed by SEM,FT-IR,XRD,TG and DTG.The results showed that an increase in the number of homogenization steps led to an increase in the degree of microfibrillation,a more uniform distribution of the CNF diameter,and an increase in the crystallinity of CNF.However,but when the number of homogenization steps exceeded 15,the rate of change decreased,and the crystallinity of CNF decreased.As the number of homogenization steps increased,the average degree of polymerization and average molecular weight of CNF decreased continuously,and after 15 homogenization steps,their rate of change also decreased.Therefore,15 steps of high-pressure homogenization represented a suitable number of steps to prepare the soybean residue CNF with an average diameter of 15 nm.

关键词： soybean residue cellulose nanofibers high pressure homogenization characteristics

数字经济与共同富裕的耦合协调机制与效应研究

在线全文

学校读者我要写书评

暂无评论

创新科技 2024年第6期24卷 20-40页

作者：杨志才侯庆庆宗雨濛郑州大学商学院河南郑州450001

数字经济与共同富裕是当今中国发展的两大重要议题。进入新发展阶段,探索如何协调数字经济与共同富裕具有重大的理论与现实意义。数字经济可以赋能并推进共同富裕,共同富裕也可以为数字经济开拓新的发展空间。基于2011—2021年的省级面... 详细信息

数字经济与共同富裕是当今中国发展的两大重要议题。进入新发展阶段,探索如何协调数字经济与共同富裕具有重大的理论与现实意义。数字经济可以赋能并推进共同富裕,共同富裕也可以为数字经济开拓新的发展空间。基于2011—2021年的省级面板数据,对我国数字经济与共同富裕发展水平进行综合评价,通过耦合协调模型分析两者的协调关系,并探究协调过程中所面临的问题。研究结果表明:①2012—2021年,数字经济综合指数与共同富裕综合指数均有显著提升,且两者出现了明显的区域差异,东部地区发展水平领先于其他地区。②数字经济与共同富裕之间的耦合协调关系呈增强趋势,但其中仍存在不协调的因素,且各地区之间发展不均衡现象明显,东部地区数字经济与共同富裕的耦合协调水平领先于其他地区。③在细分指标中,数字经济与富裕度的耦合关系最强;数字基础设施与共同富裕耦合度的区域差异较大;数字经济与共享度之间整体协调,但有部分省份处于失调状态。建议从缩小区域间数字经济发展差距、提升数字化发展水平、缩小收入差距和调整优化收入分配结构、提升西部地区经济社会发展水平等方面,推动数字经济与共同富裕协调发展。

关键词：数字经济共同富裕耦合协调地区差异

维普期刊数据库博看期刊

Observing strain glass transition in Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)high entropy alloy with Elinvar effect

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第1期168卷 16-23页

作者： Kaichao Zhang Kai Wang Bin Wang Chao Lv Jiaxing Zheng Guanqi Li Yu Fu Wenlong Xiao qingqing Cai Xutao Nie Yingfeng Shao Huilong hou Xinqing Zhao School of Materials Science and Engineering Beihang UniversityBeijing 100191China China Aerodynamics Research and Development Center Mianyang 621000China State Key Laboratory of Nonlinear Mechanics Chinese Academy of SciencesInstitute of MechanicsBeijing 100190China Tianmushan Laboratory(Zhejiang Provincial Laboratory for Aviation) Hangzhou 310000China

Exploring the phase transition of high entropy alloys(HEAs)with multiple major elements is of great importance for understanding the underlying physical mechanisms.Macroscopic martensitic phase tran-sition has been frequently reported in HEAs,however,nanoscale microstructural phase evolution has not been investigated to the same extent.Herein,we have prepared the Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)HEA and investi-gated the strain glass transition and its associated properties using dynamic mechanical analysis and mi-crostructure characterization.We have found that the elastic modulus in Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)HEA deviates from Wachtman’s equation and observed the Elinvar effect in the form of temperature-independent mod-ulus in the temperature range from 150 K to 450 K and frequency-dependence modulus around 220 K.The strain glass transition has been evidenced in Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)HEA by the formation and growth of nano-sized domains during in-situ transmission electron microscopy(TEM)cooling,and substantiated by the broken ergodicity during zero-field-cooling/field-cooling.The strain glass transition is believed to account for the Elinvar effect,where the modulus hardening of nano-sized domains compensates dynam-ically with the modulus softening of the transformable matrix.

关键词： High entropy alloys Strain glass transition Elinvar effect Microstructural evolution Nanodomains

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

珠三角地区生态文明建设成效评估研究

生态经济 2024年第4期40卷 213-219页

作者：张修玉滕飞达庄长伟孔玲玲郑子琪韩瑜关晓彤曹君谢紫霞马秀玲胡习邦田岱雯侯青青代雪娇陈星宇姚一博广东省环境科学研究院广东广州510650

生态文明建设是国家“五位一体”总体布局的重要组成部分,是关系人民福祉、关乎民族未来的长远大计。珠三角地区作为我国高质量发展区域之一,需要高度重视生态文明建设。鉴于此,论文以2015年为基准年、2020年为目标年,基于国家生态文明... 详细信息

生态文明建设是国家“五位一体”总体布局的重要组成部分,是关系人民福祉、关乎民族未来的长远大计。珠三角地区作为我国高质量发展区域之一,需要高度重视生态文明建设。鉴于此,论文以2015年为基准年、2020年为目标年,基于国家生态文明建设的总体要求、目标和任务,围绕生态制度、生态安全、生态空间、生态经济、生态生活、生态文化六大领域,综合评估2020年珠三角地区生态文明建设成效,深入剖析各地区生态文明建设成果与短板,为2025年前珠三角地区分阶段完成“国家生态文明建设示范区”创建工作提供科学支撑。结果表明:(1)2020年珠三角地区生态文明整体发展状况良好。(2)生态制度分领域成效较为突出,但生态空间和生态经济领域不平衡较为突出,短板明显。(3)深圳市、珠海市、惠州市生态文明建设处于上游水平,并且相比之下,深圳市在六大领域建设的平衡度较高。

关键词：珠三角地区生态文明建设成效评估

Palladium(Ⅱ)-Catalyzed Markovnikov Hydroalkynylation of Unactivated Terminal Alkenes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2024年第1期42卷 29-34页

作者： Chuanqi hou Pinhong Chen Guosheng Liu Sstate Key Laboratory of Organometallic Chemistry and Shanghai Hongkong Joint Laboratory in Chemical SynthesisCenter for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200032China Chang-Kung Chuang Institute East China Normal UniversityShanghai 200062China

Alkynes are versatile synthons in organic synthesis,as well as important structural moieties in bioactive molecules.Recently,transition metal-catalyzed hydroalkynylation of alkenes has been developed with reactive alkenes and alkenes bearing directing groups.However,the regioselective hydroalkynylation of simple alkenes is still challenging.Herein,we have developed a palladium-catalyzed Markovnikov hydroalkynylation of unactivated terminal alkenes,which provides an efficient approach for the synthesis of branched alkynyl compounds under mild conditions.This reaction features excellent functional group tolerance,good reaction yields and excellent regioselectivity.Moreover,the asymmetric hydroalkynylation reaction has also been achieved with moderate enantioselectivity by introducing a sterically bulky chiral Pyox ligand.

关键词： Palladium catalysis Alkynylpalladation Unactivated terminal alkenes Markovnikov hydroalkynylation

Preparation of Laser Cladding Coating Undercooling Cu-based Alloy and Co on Non-equilibrium Solidification Structure

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 Wuhan University of Technology(Materials Science) 2024年第2期39卷 463-472页

作者：田徐铭 CAO Shichao hou Kai hou Xiaopeng WANG Hongfu 张煜 Department of Outpatient Xinzhou People’s HospitalXinzhou 034099China School of Mechanical Engineering North University of ChinaTaiyuan 030051China Department of Neurosurgery Xinzhou People’s HospitalXinzhou 034099China Department of Orthopedics Xinzhou People’s HospitalXinzhou 034099China

The effect of the gradient content of Co element on the solidification process of Cu-based alloy under deep under cooling conditions was explored.The non-equilibrium solidification structure of the under cooled alloy samples were analyzed.It is found that the rapidly solidified alloy has undergone twice grain refinement during the undercooling process.Characterization and significance of the maximum undercooling refinement structure of Cu60Ni35Co5 at T=253 K were analyzed.High-density defects were observed,such as dislocations,stacking faults networks,and twinning structures.The standard FCC diffraction pattern represents that it is still a single-phase structure.Based on the metallographic diagram,EBSD and TEM data analysis,it is illustrated that the occurrence of grain refinement under high undercooling is due to stress induced recrystallization.In addition,the laser cladding technology is used to coat Co-based alloy(Stellite12) coating on 304 stainless steel substrate;the microstructure of the coating cross-section was analyzed.It was found that the microstructure of the cross-section is presented as columnar crystals,planar crystals,and disordered growth direction,so that the coating has better hardness and wear resistance.By electrochemical corrosion of the substrate and coating,it can be seen that the Co and Cr elements present in the coating are more likely to form a dense passivation film,which improved the corrosion resistance of the coating.

关键词： non-equilibrium solidification structure undercooling recrystallization laser cladding coating

Integral Operators Between Fock Spaces

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2024年第2期45卷 265-278页

作者： Yongqing LIU Shengzhao hou School of Mathematics and Statistics Changshu Institute of TechnologySuzhou 215006JiangsuChina School of Mathematical Sciences Soochow UniversitySuzhou 215006JiangsuChina

In this paper,the authors study the integral operator■induced by a kernel functionφ(z,·)∈F_α~∞between Fock spaces.For 1≤p≤∞,they prove that S_φ:F_α^(1)→F_α^(p)is bounded if and only if■where k_(a)is the ... 详细信息

关键词： Fock spaces Integral operators Normalized reproducing kernel