检索结果-南通市图书馆

A density functional study on magnetic exchange interaction between Mn(II)ion and nitronyl nitroxide radical in trans-and cis-metal-radical complexes

引用

Science China Chemistry 2005年第5期48卷 402-414页

作者： WEI haiyan WANG fan CHEN Zhida State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University Beijing 100871 China State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University Beijing 100871 China State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

The magneto-structural correlation between a Mn(II) ion, coordinated in an octahe-dral environment, and two nitronyl nitroxide radical ligands in trans- and cis-metal-radical com-plexes is investigated by the broken symmetry (BS) approach within density functional theory (DFT). The dependences of coupling constants J on three structural parameters: (i) bond angle θ (Mn-O-N (nitroxide)); (ii) rotating angle ψ, defined by the nitronyl nitroxide radical plane rotating around the axial Mn-O (nitroxide); (iii) bond distance R (Mn-O (nitroxide)) are directly calculated. Our calculations showed that both trans- and cis-Mn(II)-radical complexes behave a stronger antiferromagnetic interaction, consistent with experiments. In view of molecular orbital theory, the direct exchanges, including σ-type and π-type exchanges, are responsible for the magnetic ex-change pathways. There is a preferable linear correlation between the calculated coupling con-stants J and the overlap integral squares Sa2b between the local magnetic orbitals at the various rotating angle ψ at the fixed bond angle θ and bond distance R, in both trans- and cis-Mn(II)- radical complexes.

关键词： density functional theory, broken-symmetry approach, magnetic exchange, molecular magnetism,Mn(II)-NITR complex.

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

A non-nucleophilic gel polymer magnesium electrolyte compatible with sulfur cathode

引用

Nano Research 2020年第10期13卷 2749-2754页

作者： haiyan fan Yuxing Zhao Jianhua Xiao Jifang Zhang Min Wang Yuegang Zhang School of Nano-Tech and Nano Bionics University of Science and Technology of ChinaHefei 230026China i-Lab Suzhou Institute of Nano-Tech and Nano BionicsChinese Academy of SciencesSuzhou 215123China Department of Physics Tsinghua UniversityBejing 100084China

Magnesium/sulfur battery(Mg/S)has recently received wide attention due to its high theoretical energy density(3,260 Wh/L)and low *** further improve its safety and flexibility,developing a polymer electrolyte that can be compatible with both electrophilic S and Mg is ***,we report a magnesium chloride-(fluorinated tetraethylene glycolic)borate(MgCl-FTGB)based non-nucleophilic,gel-type polymer electrolyte for Mg/S battery via a facile synthetic method through commercially available *** electrolyte coupled with glass fiber allows reversible Mg deposition/dissolution(100%coulombic efficiency)with low polarization(500μA/cm^2,300/300 mV),and shows a wide electrochemical window of 4.8 V(***/Mg^2+).Mg/S battery assembled with this electrolyte can cycle over 50 times with a high specific discharge capacity retention of over 1,100 mAh/g.

关键词： magnesium/sulfur battery polymer electrolyte non-nucleophilic electrolyte safety

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

Solid-liquid solvent extraction of metal ions

引用

Journal of University of Science and Technology Beijing 2003年第3期10卷 1-7页

作者： Bo Peng, haiyan fan, and Jinzhang GaoDepartment of Chemistry, Northwest Normal University, Lanzhou 730070, China Department of Chemistry Northwest Normal University Lanzhou 730070 China

An overview of extraction of some trace metal ions using molten solvent (lowmelting substance) during last two decades is presented. The development of this technique since itsinception is briefly traced. The comparison of extraction efficiency, thermodynamics and kineticsmainly involving extraction of rare earth ions between molten solvent extraction at high temperatureand usual liquid-liquid extraction at room temperature are discussed in detail. The variousparameters obtained from the previous and present studies such as equilibrium extraction constantK_(ex), pH_(1/2), thermodynamic and kinetic data are displayed in tabular form. Finally, the currentdemands, disadvantages and future prospects are also evaluated.

关键词： solid-liquid solvent extraction metal ions thermodynamics kinetics determination

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

Molten solvent extraction behavior of trivalent La, Sm, Dy, and Yb with tri-n-butyl phosphate into molten paraffin wax at 60 ℃

引用

Rare Metals 2002年第1期21卷 7-11页

作者： PENG Bo, GAO Jinzhang, fan haiyan, KANG Jingwan, and YANG Wu Department of Chemistry, Northwest Normal University, Lanzhou 730070, China Department of Chemistry Northwest Normal University Lanzhou 730070

The extraction behavior of La^3+, Sm^3+, Dy^3+, and Yb^3+ insodium acetate-acetic acid medium was studied with tri-N-butylphosphate (TBP) at 60 deg. C using paraffin wax as a diluent. Theextraction percentage is greater than 85/100 in the pH range of 6 to8. The result of slope analysis method indicates that thecompositions of the extracted species are different between the lightand heavy rare ear this. The formula of the extracted species isfound to be La (TBP) (OH) (Ac)_2 for La^3+ and Yb (TBP) (OH)_3 forYb^3+. The effects of extracting time, the concentration of TBP inthe organic phase and salts on the extraction efficiency were alsodiscussed.

关键词： solvent extraction rare earth TBP Paraffin wax

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

CNGC20 plays dual roles in regulating plant growth and immunity in Brassica napus

引用

Crop Journal 2024年第6期12卷 1533-1546页

作者： Tan, Yingying Huang, Guowei fan, haiyan Wu, Tao Guan, Zhilin Liu, Kede National Key Lab of Crop Genetic Improvement Huazhong Agricultural University Hubei Wuhan 430070 China College of Life Sciences Xinyang Normal University Henan Xinyang 464000 China Wuhan Botanical Garden Chinese Academy of Sciences Hubei Wuhan 430074 China

Inflorescence architecture is determined by inflorescence length, branch angles and the density of siliques, which affects planting density, lodging resistance and mechanical operation in rapeseed. However, the molecular mechanisms controlling inflorescence architecture are poorly understood, restricting the progress of breeding varieties with ideal plant architecture in oilseed rape. In this study, we have identified and characterized a rapeseed inflorescence development mutant, reduced inflorescence length (ril), which exhibits determinate and shortened inflorescences, reduced plant height, compact branches, and increased silique density. Through BSA-seq and map-based cloning, we find that RIL encodes a cyclic nucleotide-gated channel 20 (***20). A substitution of proline at the 304th position to leucine (P304L) was identified in the conserved transmembrane domain of ***20. This P304L substitution neither affects the subcellular localization and self-assembly of ***20, nor disrupts the interactions with BRASSINOSTEROID INSENSITIVE 1-associated receptor kinase 1 (BAK1), which interacts with CNGC20 and phosphorylates it to regulate Ca2+ channel stability. However, the P304L substitution increases channel activity and Ca2+ influx, which in turn induces immune responses such as cell death, H2O2 accumulation, upregulation of pathogenesis-related genes, and pattern-triggered immunity. The enhanced immunity improves the resistance to Leptosphaeria biglobosa and Sclerotinia sclerotiorum. Transcriptome analysis further revealed that CNGC20 plays dual roles in regulating plant growth and immunity via the brassinosteroid and auxin signaling pathways. The findings in this study provide deeper insights into the intricate relationship between cytosolic Ca2+ level and plant development and immunity, as well as the trade-off between immunity and the performance of yield-related traits in the heterozygo

关键词： Brassica napus L. CNGC20 Inflorescence development Plant architecture Plant immunity

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

Recovery of Corrupted Low-Rank Tensors

引用

Applied Mathematics 2017年第2期8卷 229-244页

作者： haiyan fan Gangyao Kuang Department of Electronic Science and Engineering National University of Defense Technology Changsha China

This paper studies the problem of recovering low-rank tensors, and the tensors are corrupted by both impulse and Gaussian noise. The problem is well accomplished by integrating the tensor nuclear norm and the l1-norm in a unified convex relaxation framework. The nuclear norm is adopted to explore the low-rank components and the l1-norm is used to exploit the impulse noise. Then, this optimization problem is solved by some augmented-Lagrangian-based algorithms. Some preliminary numerical experiments verify that the proposed method can well recover the corrupted low-rank tensors.

关键词： Low-Rank Tensor Tensor Recovery Augmented Lagrangian Method Impulsive Noise Mixed Noise

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

A flexible artificial solid-electrolyte interlayer supported by compactness-tailored carbon nanotube network for dendrite-free lithium metal anode

引用

Journal of Energy Chemistry 2022年第6期31卷 421-427,I0012页

作者： Haowen Liu Jifang Zhang Yang Liu Yang Wei Shuaiyang Ren Ludi Pan Yi Su Jianhua Xiao haiyan fan Yitao Lin Yipeng Su Yuegang Zhang State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China

A dendrite-free lithium metal anode requires a stable interface designed for efficient and reversible lithium plating and stripping. In this work, we have devised a mechanically flexible artificial Li_(3)N solid-electrolyte interlayer supported by a dual-layer compactness-tailored carbon nanotube fiber network. The more compact side of the network ensures a full coverage of Li_(3)N, which prevents the reaction between electrolyte and lithium. The other side, with sparsely distributed nanotube fibers, provides mechanical flexibility for the film, and induces three-dimensional lithium deposition along its structure without any dendrite formation. The resulting full cell with NCM811 cathode has a high capacity retention of 95.1% for 160 cycles compared with less than 80% for the control.

关键词： Lithium metal anode Artificial SEI CNT network 3D deposition

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

Lp-PLA2、sTfR、P2X7R水平与急性脑梗死患者静脉溶栓后认知功能及预后不良的关系

引用

实用心脑肺血管病杂志 2025年第1期33卷 61-66页

作者：王秀杰赵晓晶李敏郑富霞熊鑫范海燕华北理工大学附属医院神经内科河北省唐山市063000

目的探讨脂蛋白相关磷脂酶A2(Lp-PLA2)、可溶性转铁蛋白受体(sTfR)、嘌呤能离子通道型受体7(P2X7R)水平与急性脑梗死(ACI)患者静脉溶栓后认知功能及预后不良的关系。方法回顾性选取2022年1月—2024年1月华北理工大学附属医院收治的ACI ... 详细信息

目的探讨脂蛋白相关磷脂酶A2(Lp-PLA2)、可溶性转铁蛋白受体(sTfR)、嘌呤能离子通道型受体7(P2X7R)水平与急性脑梗死(ACI)患者静脉溶栓后认知功能及预后不良的关系。方法回顾性选取2022年1月—2024年1月华北理工大学附属医院收治的ACI 118例作为研究对象,根据静脉溶栓后3个月蒙特利尔认知评估量表(MoCA)评分将患者分为认知正常组(MoCA评分≥26分,n=62)和认知障碍组(MoCA评分2分,n=41)。患者均接受阿替普酶静脉溶栓治疗。收集患者的临床资料,采用Spearman秩相关分析探讨Lp-PLA2、sTfR、P2X7R水平与ACI患者静脉溶栓后MoCA评分的相关性;采用多因素Logistic回归分析探讨ACI患者静脉溶栓后预后不良的影响因素,绘制ROC曲线以分析Lp-PLA2、sTfR、P2X7R水平及三者联合对ACI患者静脉溶栓后预后不良的预测价值。结果认知障碍组梗死面积大于认知正常组,TG、Lp-PLA2、P2X7R水平高于认知正常组,HDL-C、sTfR水平低于认知正常组(P<0.05)。Spearman秩相关分析结果显示,Lp-PLA2、P2X7R水平与ACI患者静脉溶栓后MoCA评分均呈负相关,sTfR水平与其MoCA评分呈正相关(P=0.001)。预后不良组梗死面积大于预后良好组,Lp-PLA2、P2X7R水平高于预后良好组,sTfR水平低于预后良好组(P<0.05)。多因素Logistic回归分析结果显示,梗死面积增大、Lp-PLA2水平升高、P2X7R水平升高是ACI患者静脉溶栓后预后不良的独立危险因素,sTfR水平升高是其保护因素(P<0.05)。ROC曲线分析结果显示,Lp-PLA2、sTfR、P2X7R水平及三者联合预测ACI患者静脉溶栓后预后不良的曲线下面积(AUC)分别为0.769[95%CI(0.681~0.857)]、0.801[95%CI(0.721~0.880)]、0.809[95%CI(0.719~0.899)]、0.917[95%CI(0.868~0.966)],三者联合预测ACI患者静脉溶栓后预后不良的AUC分别大于Lp-PLA2、sTfR、P2X7R水平单独预测的AUC(P<0.05)。结论Lp-PLA2、P2X7R水平与ACI患者静脉溶栓后认知功能均呈负相关,sTfR水平与其认知功能呈正相关;Lp-PLA2、P2X7R水平升高是ACI患者静脉溶栓后预后不良的独立危险因素,sTfR水平升高是其保护因素;Lp-PLA2、sTfR、P2X7R水平对ACI患者静脉溶栓后预后不良均具有一定预测价值,且三者联合的预测价值更高。

关键词：脑梗死静脉溶栓脂蛋白相关磷脂酶A2 可溶性转铁蛋白受体嘌呤能离子通道型受体7 认知功能预后

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

Tailoring Mg^(2+)Solvation Structure in a Facile All-Inorganic[Mg_(x)Li_(y)Cl2_(x+y)·nTHF]Complex Electrolyte for High Rate and Long Cycle-Life Mg Battery

引用

Energy & Environmental Materials 2023年第2期6卷 152-158页

作者： haiyan fan Xinxin Zhang Yuxing Zhao Jianhua Xiao Hua Yuan Guang Wang Yitao Lin Jifang Zhang Ludi Pan Ting Pan Yang Liu Yuegang Zhang State Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China

A high-performance all-inorganic magnesium-lithium chloride complex(MLCC)electrolyte is synthesized by a simple room-temperature reaction of LiCl with MgCl_(2) in tetrahydrofuran(THF)*** dynamics simulation,density functional theory calculation,Raman spectroscopy,and nuclear magnetic resonance spectroscopy reveal that the formation of[Mg_(x)Li_(y)Cl_(2x+y)·nTHF]complex solvation structure significantly lowers the coordination number of THF in the first solvation sheath of Mg^(2+),which significantly enhances its de-solvation *** MLCC electrolyte presents a stable electrochemical window up to 3.1 V(vs Mg/Mg^(2+))and enables reversible cycling of Mg metal deposition/stripping with an outstanding Coulombic efficiency up to 99%at current densities as high as 10 mA cm^(-2).Utilizing the MLCC electrolyte,a Mg/Mo_(6)S_(8) full cell can be cycled for over 10000 cycles with a superior capacity retention of 85 mA h g^(-1) under an ultrahigh rate of 50 C(1 C=128.8 mA g^(-1)).The facile synthesis of highperformance MLCC electrolyte provides a promising solution for future practical magnesium batteries.

关键词： cycle life electrolyte Mg battery solvation structure

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

Fast Tensor Principal Component Analysis via Proximal Alternating Direction Method with Vectorized Technique

引用

Applied Mathematics 2017年第1期8卷 77-86页

作者： haiyan fan Gangyao Kuang Linbo Qiao Department of Electronic Science and Engineering National University of Defense Technology Changsha China Department of Computer National University of Defense Technology Changsha China

This paper studies the problem of tensor principal component analysis (PCA). Usually the tensor PCA is viewed as a low-rank matrix completion problem via matrix factorization technique, and nuclear norm is used as a convex approximation of the rank operator under mild condition. However, most nuclear norm minimization approaches are based on SVD operations. Given a matrix , the time complexity of SVD operation is O(mn2), which brings prohibitive computational complexity in large-scale problems. In this paper, an efficient and scalable algorithm for tensor principal component analysis is proposed which is called Linearized Alternating Direction Method with Vectorized technique for Tensor Principal Component Analysis (LADMVTPCA). Different from traditional matrix factorization methods, LADMVTPCA utilizes the vectorized technique to formulate the tensor as an outer product of vectors, which greatly improves the computational efficacy compared to matrix factorization method. In the experiment part, synthetic tensor data with different orders are used to empirically evaluate the proposed algorithm LADMVTPCA. Results have shown that LADMVTPCA outperforms matrix factorization based method.

关键词： Tensor Principal Component Analysis Proximal Alternating Direction Method Vectorized Technique

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：