检索结果-南通市图书馆

Theoretical probe into universal tetrad effect for complexation discrepancy between lanthanide elements and organophosphoric extractant diethyl phosphoric acid

引用

Journal of Rare Earths 2024年第6期42卷 1142-1148,I0006页

作者： Haif.ng Zheng Yanling Li Xuyi Zhang Jinglu Han Songsong Li Guolong wu Qingshi Liu Xiaojuan Liu wuping Liao State Key Laboratory of Rare Earth Resources Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China University of Science and Technology of China Hefei230026China School of Chemistry and Chemical Engineering Nanchang UniversityNanchang330031China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou341000China

The deep understanding of 4f-correlated electron motion behavior is experimentally limited due to similar physicochemical properties of rare earth elements(REEs).While the solvent extraction behavior originating from the continuous occupation of 4f electrons along the lanthanide family provides a particular platform to probe the 4f electrons motion behavior and its correlations to their versatile ***,the complexation between REEs and the prototypical extractant of diethyl phosphoric acid(DEP)was substantially studied based on quantum mechanical *** results firstly show that the average bond lengths between Ln and six coordinated oxygen atoms are consistent with lanthanide contraction phenomenon,and gadolinium break effect is also obviously ***,the"tetrad effect"is figured out based on the subtle discrepancy of 4f electrons occupation,namely La-Nd,Sm-Eu,Gd-Dy and ***,the main composition is 4f5d6p for La-Nd,while the discrepancy is due to the increasing electrons in the 5d shell,while it is 4f5d for *** Gd-Dy,their 4f orbitals accept little electrons and the donating electrons flow into 6s5d subshells due to the half-filled stability and the enhancement of shielding *** electrons donate into 5d6p subshells due to multiply electrons occupation of 4f orbitals for *** detailed analyses obviously clarify the"tetrad effect"along the lanthanide family due to the different variation of 4f orbital *** is expected that these microscopic understandings provide important guidance for the separation of REEs and the design of new extractants.

关键词： Theoretical calculation Rare earths 4f electron Tetrad effect Gadolinium break

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Research on Electromagnetic Wave Absorption Based on Electrospinning Technology

引用

Chinese Journal of Chemistry 2024年第7期42卷 777-789页

作者： Baoding Li Jing Qiao Yue Liu Haoyuan Tian Wei Liu Qilei wu Zhou Wang Jiurong Liu Zhihui Zeng Key Laboratoryfor Liquid-Solid StructuralEvolution and Processing of Materials Schoolof Materials Science and EngineeringShandong UniversityJinanShandong 250061China China North Industries Group 53rd Research Institute JinanShandong 250000China School of Mechanical Engineering Shandong UniversityJinanShandong 250061China Institute of Crystal Materials State Key Laboratory of Crystal MaterialsShandong UniversityJinanShandong 250100China Shenzhen Research Institute of Shandong University ShenzhenGuangdong 518057China Science and Technology on Electromagnetic Compatibility Laboratory China Ship Development and Design CentreWuhanHubei 430064China suzhou Research Institute of Shandong University SuzhouJiangsu215123China

At present,in order to overcome electromagnetic interference and prevent electromagnetic harm,the research of new and efficient electromagnetic wave absorbing materials has become the research focus in the field of materials *** one-dimensional structure can promote the impedance matching and attenuation characteristics of the absorbing ***,as an effective method to prepare nanofibers with high length-diameter ratio,has been widely concerned because it is suitable for struc-tural design of various *** this paper,the research progress and absorption properties of nano-fiber materials prepared by electrospinning combined with different processes are introduced.

关键词： Electromagnetic wave(EMW)absorbing Electrospinning Nanofiber Impedance matching Nanocomposite

来源：

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

Heterogeneous population distribution enhances resistance to wheat lodging by optimizing the light environment

引用

Journal of Integrative Agriculture 2024年第7期23卷 2211-2226页

作者： Yibo Hu f.ng Qin Zhen wu Xiaoqin Wang Xiaolong Ren Zhikuan Jia Zhenlin Wang Xiaoguang Chen Tie Cai College of Agronomy Northwest A&F UniversityYangling 712100China Key Laboratory of Crop Physi-Ecology and Tillage Science in Northwestern Loess Plateau Ministry of Agriculture and Rural AffairsNorthwest A&F UniversityYangling 712100China College of Agronomy Shandong Agricultural University/State Key Laboratory of Crop BiologyTai’an 271018China Xuzhou Institute of Agricultural Sciences in Jiangsu Xuhuai Area Xuzhou 221131China

Lodging is still the key factor that limits continuous increases in wheat yields today,because the mechanical strength of culms is reduced due to low-light stress in populations under high-yield *** mechanical properties of the culm are mainly determined by lignin,which is affected by the light ***,little is known about whether the light environment can be sufficiently improved by changing the population distribution to inhibit culm ***,in this study,we used the wheat cultivar“Xinong 979”to establish a low-density homogeneous distribution treatment(LD),high-density homogeneous distribution treatment(HD),and high-density heterogeneous distribution treatment(HD-h)to study the regulatory effects and mechanism responsible for differences in the lodging resistance of wheat culms under different population *** with LD,HD significantly reduced the light transmittance in the middle and basal layers of the canopy,the net photosynthetic rate in the middle and lower leaves of plants,the accumulation of lignin in the culm,and the breaking resistance of the culm,and thus the lodging index values increased significantly,with lodging rates of 67.5%in 2020–2021 and 59.3%in 2021–*** HD-h,the light transmittance and other indicators in the middle and basal canopy layers were significantly higher than those under HD,and the lodging index decreased to the point that no lodging *** with LD,the activities of phenylalanine ammonia-Lyase(PAL),4-coumarate:coenzyme A ligase(4CL),catechol-O-methyltransferase(COMT),and cinnamyl-alcohol dehydrogenase(CAD)in the lignin synthesis pathway were significantly reduced in the culms under HD during the critical period for culm formation,and the relative expression levels of TaPAL,Ta4CL,TaCOMT,and TaCAD were significantly ***,the activities of lignin synthesis-related enzymes and their gene expression levels were significantly increased under HD-h compare

关键词： canopy light environment lignin lodging population distribution wheat

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Selenium nanoparticles in aquaculture:Unique advantages in the production of Se-enriched grass carp(Ctenopharyngodon idella)

引用

Animal Nutrition 2024年第1期16卷 189-201页

作者： Chao Zhu Zif.ng wu Qimin Liu Xiaolin Wang Lijuan Zheng Shuyang He f.ngxia Yang Hong Ji wuzi Dong College of Animal Science and Technology Northwest A&F UniversityYanglingShaanxi712100China College of forestry Northwest A&F UniversityYanglingShaanxi712100China Biology Research Centre of Qin Mountains Wildlife Northwest A&F UniversityYanglingShaanxi712100China

The production of selenium-enriched fish can contribute to alleviating selenium deficiency in human ***,it is still unclear which selenium source,as an additive,can efficiently and costeffectively produce high-quality selenium-enriched *** study evaluated the effects of selenium nanoparticles(SeNP),selenite,and selenomethionine(SeMet)on the growth,antioxidant capacity,selenium content,selenium speciation,and meat quality of grass *** diets were prepared,including a basal diet(BD)and three concentrations(0.1,0.3,and 0.9 mg/kg)of SeNP,selenite,and SeMet.A total of600 fish(250.79±1.57 g)were randomly assigned to 30 tanks(3 tanks/group).fish were fed the experimental diet three times daily for 60 *** this study,SeNP most significantly promoted the growth and antioxidant capacity of grass carp,with 0.3 mg/kg SeNP identified as the optimal additive ***,SeNP demonstrated equally excellent bioavailability as SeMet and significantly increased the content of SeMet in grass carp(Ctenopharyngodon idella)***,compared to SeMet and selenite,dietary SeNP could more significantly enhance the content of selenocysteine(SeCys2)and methylselenocysteine(MeSeCys)in grass carp muscle *** addition,we have demonstrated that SeCys2and MeSeCys promote apoptosis of cancer cells(HeLa)through the mitochondrial apoptotic pathway(involving Bax and Bcl-2).furthermore,as an additive,0.3 mg/kg SeNP significantly improved the flesh quality of grass carp by reducing crude fat and heavy metal content,as well as increasing the levels of eicosapentaenoic acid(EPA)and docosahexaenoic acid(DHA)and the ratio of n-3/n-6 polyunsaturated fatty acid(PUfA).In summary,SeNP is the most suitable additive for producing selenium-enriched fish.

关键词： Selenium nanoparticle Speciation analysis Grass carp Selenium additive

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Boosting reversible charging of Li-ion batteries at low temperatures by a synergy of propylene carbonate-based electrolyte and defective graphite

引用

Nano Research 2024年第3期17卷 1491-1499页

作者： Yingqiang wu Jiao Zhang Jinli Liu Li Sheng Bo Zhang Limin Wang Siqi Shi Li Wang Hong Xu Xiangming He Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of Sciences(CAS)Changchun 130022China China National Quality Supervision and Inspection Center for Industrial Explosive Materials Nanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Materials Genome InstituteShanghai UniversityShanghai 200444China

Propylene carbonate(PC)-based electrolytes have exhibited significant advantages in boosting the low-temperature discharging of graphite-based Li-ion ***,it is still unclear whether they can improve the charging property and suppress lithium *** this topic is challenging due to the problem of electrochemical *** overcome this issue,we introduced graphite with phase *** results show that the pouch-type full batteries using PC-based electrolyte exhibit steady performance over 500 cycles and can be reversibly charged over 30 times at-20℃ with an average Coulombic efficiency of 99.95%,while the corresponding value for the conventional ethylene carbonate(EC)-based electrolyte sample is only 31.20%.This indicates that the use of PC-based electrolyte significantly suppresses lithium plating during low-temperature *** further demonstrate that the improved performance is mainly attributed to the unique solvation structure,where Pf-6more anions participate in solvation,leading to the formation of a stable f-rich solid state electrolyte interface on the graphite surface and a lower reduction tendency of Li+*** work inspires new ideas for the design of PC-based electrolytes for low-temperature charging and fast-charging batteries.

关键词： lithium-ion batteries graphite propylene carbonate low-temperature charging

来源：

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

Wide Stopband Substrate Integrated Waveguide filter Using Bisection and Trisection Coupling in Multilayer

引用

Chinese Journal of Electronics 2024年第2期33卷 436-442页

作者： Peng CHU Jianguo f.ng Peng ZHU Lei GUO Long ZHAng Leilei LIU Guoqing LUO Ke wu College of Electronic and Optical Engineering Nanjing University of Posts and Telecommunications National and Local Joint Engineering Laboratory of Rf Integration and Micro-Assembly Technology School of Information and Communication Engineering Dalian University of Technology Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems Sun Yat-sen University College of Electronics and Information Engineering Shenzhen University School of Electronics and Information Hangzhou Dianzi University Poly-Grames Research Center Polytechnique Montreal

This article presents a highly efficient method for substrate-integrated-waveguide（SIW） filters to achieve very wide stopbands. By employing the proposed trisection slots in addition to the bisection slots as the inter-coupling structures, all spurious modes below TE505 of a SIW filter working in the fundamental mode TE101（f0）can be eliminated without requiring additional structure or complex theoretical analysis, without affecting the design of the fundamental passbands, and without degrading the performance of the filters. for verification, two prototype filters are designed, fabricated, and measured with wide stopbands up to 4.15f0 and 4.83f0, respectively. The proposed technique could facilitate the development of high-performance wide-stopband SIW filters for microwave/wireless circuits and systems.

关键词： Microwave measurement Couplings filters Prototypes Nonhomogeneous media Microwave theory and techniques Microwave circuits

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acute upper gastrointestinal bleeding due to portal hypertension in a patient with primary myelofibrosis:A case report

引用

World Journal of Clinical Cases 2024年第15期12卷 2621-2626页

作者： Yu Chen Bing-Bing Kong He Yin Hao Liu Sheng wu Ting Xu Department of Emergency Beijing Tsinghua Changgung HospitalSchool of Clinical MedicineTsinghua UniversityBeijing 102218China Department of Pathology Beijing Tsinghua Changgung HospitalSchool of Clinical MedicineTsinghua UniversityBeijing 102218China

BACKGROUND Acute upper gastrointestinal bleeding is a common medical emergency that has a 10%hospital mortality *** to the etiology,this disease can be divided into acute varicose veins and nonvaricose *** from esophageal varices is a life-threatening complication of portal *** hypertension is a clinical syndrome defined as a portal venous pressure that exceeds 10 *** is the most common cause of portal hypertension,and thrombosis of the portal system not associated with liver cirrhosis is the second most common cause of portal hypertension in the Western *** myeloproliferative disorders are the main cause of portal venous thrombosis,and somatic mutations in the Janus kinase 2 gene(JAK2 V617f)can be found in approximately 90% of polycythemia vera,50% of essential thrombocyrosis and 50% of primary *** SUMMARY We present a rare case of primary myelofibrosis with gastrointestinal bleeding as the primary manifestation that presented as portal-superior-splenic mesenteric vein *** blood tests revealed the presence of the JAK2 V617f *** marrow biopsy ultimately confirmed the diagnosis of myelofibrosis(Mf-2 grade).CONCLUSION In patients with acute esophageal variceal bleeding due to portal hypertension and vein thrombosis without cirrhosis,the possibility of myeloproliferative neoplasms should be considered,and the JAK2 mutation test should be performed.

关键词： Acute esophageal variceal bleeding Portal hypertension Myelofibrosis JAK2 V617f mutation Case report

来源：

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

Interfacial assembly of 2D polydopamine/graphene heterostructures with well-defined mesopore and tunable thickness for high-energy planar micro-supercapacitors

引用

Chinese Chemical Letters 2024年第7期35卷 439-444页

作者： Jieqiong Qin Zhi Yang Jiaxin Ma Liangzhu Zhang feifei Xing Hongtao Zhang Shuxia Tian Shuanghao Zheng Zhong-Shuai wu College of Science Henan Agricultural UniversityZhengzhou 450002China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China Mechanical and Electrical Engineering Institute Zhengzhou University of Light IndustryZhengzhou 450002China

Two-dimensional(2D)mesoporous pseudocapacitive polymer/graphene heterostructures combine the advanced merits of 2D materials and mesoporous materials,possessing unique nanosheet structure,large specific surface area(SSA),abundant oxygen/nitrogen-containing groups,desirable electrical conductivity and admirable electrochemical redox activity,and hold great potential for constructing high-performance planar micro-supercapacitors(MSCs).Herein,we demonstrate the interfacial assembly of 2D mesoporous polydopamine/graphene(mPDG)heterostructures with well-defined mesopore structure(12 nm)and adjustable thickness(7.5–14.1 nm)for planar high-energy pseudocapacitive *** to medium thickness,exposed mesopore of 12 nm and large SSA of 108 m^(2)/g,the m PDG with 10.8 nm thickness reveals prominent mass capacitance of 419 f/g and impressive cycling stability with~96%capacitance retention after 5000 ***,the symmetric mPDG-based MSCs with“water-in-salt”gel electrolyte present wide voltage window of 1.6 V,superior volumetric energy density of 11.5 mWh/cm^(3),outstanding flexibility and self-integration ***,this work offers a new platform of controllably synthesizing 2D mesoporous heterostructures for high-performance MSCs.

关键词： 2D materials Mesopores Heterostructures Polydopamine High energy density Micro-supercapacitors

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Expansion and improvement of ChinaMu by MuT-seq and chromosome-level assembly of the Mu-starter genome

引用

Journal of Integrative Plant Biology 2024年第4期66卷 645-659页

作者： Lei Liang Yuancong Wang Yanbin Han Yicong Chen Mengfei Li Yibo wu Zeyang Ma Han Zhao Rentao Song State Key Laboratory of Maize Bio-breeding Frontiers Science Center for Molecular Design BreedingJoint International Research Laboratory of Crop Molecular BreedingNational Maize Improvement CenterCollege of Agronomy and BiotechnologyChina Agricultural UniversityBeijing 100091China Institute of Crop Germplasm and Biotechnology Jiangsu Provincial Key Laboratory of AgrobiologyJiangsu Academy of Agricultural SciencesNanjing 210014China Sanya Institute of China Agricultural University Sanya 572025China Hainan Yazhou Bay Seed Laboratory Sanya 572025China

ChinaMu is the largest sequence-indexed Mutator(Mu)transposon insertional library in maize(Zea mays).In this study,we made significant improvements to the size and quality of the ChinaMu *** developed a new Mu-tag isolation method Mu-Tn5-seq(MuT-seq).Compared to the previous method used by ChinaMu,MuT-seq recovered 1/3 more germinal insertions,while requiring only about 1/14 of the sequencing volume and 1/5 of the experimental *** MuT-seq,we identified 113,879 germinal insertions from 3,168 Mu-active f1 *** also assembled a high-quality genome for the Mu-active line Mu-starter,which harbors the initial active MuDR element and was used as the pollen donor for the mutation *** the Mu-starter genome,we recovered 33,662(15.6%)additional germinal insertions in 3,244(7.4%)genes in the Mu-starter *** Mu-starter genome also improved the assignment of 117,689(54.5%)germinal *** newly upgraded ChinaMu dataset currently contains 215,889 high-quality germinal *** insertions cover 32,224 pan-genes in the Mu-starter and B73Ref5 genomes,including 23,006(80.4%)core genes shared by the two *** a test model,we investigated Mu insertions in the pentatricopeptide repeat(PPR)superfamily,discovering insertions for 92%(449/487)of PPR genes in ChinaMu,demonstrating the usefulness of ChinaMu as a functional genomics resource for maize.

关键词： ChinaMu Mutator MuT-seq PPR gene Zea mays

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Biomimetic leaf structures for ultra-thin electromagnetic wave absorption

引用

Nano Research 2024年第5期17卷 4507-4516页

作者： Shikun Hou Ying Wang f.ng Gao fei Jin Benf.ng Zhu Qiong wu Hongliang Ge Zhihai Cao Hua Yang Magnetism Key Laboratory of Zhejiang Province&College of Optical and Electronic Technology China Jiliang UniversityHangzhou 310018China Department of Materials Science and Engineering Guangdong Technion-Israel Institute of TechnologyShantou 515063China Key Laboratory of Advanced Textile Materials and Manufacturing Technology and Engineering Research Center for Eco-Dyeing&finishing of Textiles Ministry of EducationZhejiang Sci-Tech UniversityHangzhou 310018China

Ultra-thin electromagnetic wave(EMW)absorbers present challenging demands on EMW absorption *** inspiration from heather leaf structures,this study introduces an innovative design strategy for EMW absorbing material,proposing biomimetic leaf SnO_(2) structures(bio-SnO_(2))on carbon fabric(Cf).By employing leaf-shaped SnS2 as precursors,biomimetic leaf SnO_(2) nanostructures are constructed on Cf surface after a simple thermal treatment,resulting in bio-SnO_(2)@Cf *** results indicate that bio-SnO_(2)@Cf exhibits an exceptional minimum reflection loss of-54.8 dB at an incredibly thin thickness of 1.2 *** cross section(RCS)simulations further validate the outstanding EMW attenuation ability of bio-SnO_(2)@Cf,attaining a maximum RCS reduction value of 16.9 dBm^(2) at an incident wave angle ofθ=0°.This novel research showcases the biomimetic structural design strategy and its remarkable function in enhancing the EMW absorbing performance at ultra-thin absorber thickness.

关键词： biomimetic leaf structures electromagnetic wave absorption ultra-thin thickness

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：