New 3D Framework Vanadium(Ⅲ) Phosphite with One-dimensional 4,12-Member Ring Channels

A new vanadium（Ⅲ） phosphite,V2（HPO3）3（1）,was synthesized hydrothermally with V2O5,H3PO3 as reactants,1,6-diaminopropane（1,6-HAD） as the structure-directing agent and characterized by single crystal X-ray diffraction,powder X-ray diffraction,IR spectroscopy,TGA,ICP-AES and elemental analyses.Single-crystal X-ray diffraction analysis reveals that compound 1 crystallized in the P6（3）/m hexagonal space group with the unit-cell parameters：a=0.80436（10） nm,c=0.73972（2） nm,V=0.41447（13） nm^3,Z=4.The construction of 3D framework structure of compound 1 may be viewed as the assembly of V2O9 dimers and HPO3 pseudo-pyramids which lead to form the one-dimensional 4,12-member ring channels along the [001] direction.

Bottom-up lithium growth guided by Ag concentration gradient in 3D PVDF framework towards stable lithium metal anode

Three-dimensional(3 D)frameworks have received much attention as an effective modification strategy for next-generation high-energy-density lithium metal batteries.However,the top-growth mode of lithium(Li)on the 3 D framework remains a tough challenge.To achieve a uniform bottom-up Li growth,a scheme involving Ag concentration gradient in 3 D PVDF framework(C-Ag/PVDF)is proposed.Ag nanoparticles with a concentration gradient induce an interface activity gradient in the 3 D framework,and this gradient feature is still maintained during the cycle.As a result,the C-Ag/PVDF framework delivers a long lifespan over 1800 h at a current density of 1 mA cm^(-2) with a capacity of 1 mAh cm^(-2),and shows an ultra-long life(>1300 h)even at a high current density of 4 mA cm^(-2) with a capacity of 4 mAh cm^(-2).The advantage of concentration gradient provides further insights into the optimal design of the 3 D framework for stable Li metal anode.

Atomic Modulation of 3D Conductive Frameworks Boost Performance of MnO2 for Coaxial Fiber‑Shaped Supercapacitors

Coaxial fiber-shaped supercapacitors are a promising class of energy storage devices requiring high performance for flexible and miniature electronic devices.Yet,they are still struggling from inferior energy density,which comes from the limited choices in materials and structure used.Here,Zn-doped CuO nanowires were designed as 3D framework for aligned distributing high mass loading of MnO2 nanosheets.Zn could be introduced into the CuO crystal lattice to tune the covalency character and thus improve charge transport.The Zn–CuO@MnO2 as positive electrode obtained superior performance without sacrificing its areal and gravimetric capacitances with the increasing of mass loading of MnO2 due to 3D Zn–CuO framework enabling efficient electron transport.A novel category of free-standing asymmetric coaxial fiber-shaped supercapacitor based on Zn0.11CuO@MnO2 core electrode possesses superior specific capacitance and enhanced cell potential window.This asymmetric coaxial structure provides superior performance including higher capacity and better stability under deformation because of sufficient contact between the electrodes and electrolyte.Based on these advantages,the as-prepared asymmetric coaxial fiber-shaped supercapacitor exhibits a high specific capacitance of 296.6 mF cm^−2 and energy density of 133.47μWh cm^−2.In addition,its capacitance retention reaches 76.57%after bending 10,000 times,which demonstrates as-prepared device’s excellent flexibility and long-term cycling stability.

3D Carbon Frameworks for Ultrafast Charge/Discharge Rate Supercapacitors with High Energy‑Power Density

Carbon-based electric double layer capacitors(EDLCs)hold tremendous potentials due to their high-power performance and excellent cycle stability.However,the practical use of EDLCs is limited by the low energy density in aqueous electrolyte and sluggish diffusion kinetics in organic or/and ionic liquids electrolyte.Herein,3D carbon frameworks(3DCFs)constructed by interconnected nanocages(10-20 nm)with an ultrathin wall of ca.2 nm have been fabricated,which possess high specific surface area,hierarchical porosity and good conductive network.After deoxidization,the deoxidized 3DCF(3DCFDO)exhibits a record low IR drop of 0.064 V at 100 A g^−1 and ultrafast charge/discharge rate up to 10 V s^−1.The related device can be charged up to 77.4%of its maximum capacitance in 0.65 s at 100 A g^−1 in 6 M KOH.It has been found that the 3DCF-DO has a great affinity to EMIMBF4,resulting in a high specific capacitance of 174 F g^−1 at 1 A g^−1,and a high energy density of 34 Wh kg^−1 at an ultrahigh power density of 150 kW kg^−1 at 4 V after a fast charge in 1.11 s.This work provides a facile fabrication of novel 3D carbon frameworks for supercapacitors with ultrafast charge/discharge rate and high energy-power density.

N/S co-doped 3D carbon framework prepared by a facile morphology-controlled solid-state pyrolysis method for oxygen reduction reaction in both acidic and alkaline media

Developing high-performance non-precious metal electrocatalysts for oxygen reduction reaction(ORR)is crucial for the commercialization of fuel cells and metal-air batteries.However,doped carbon-based materials only show good ORR activity in alkaline medium,and become less effective in acidic environment.We believe that an appropriate combination of both ionic and electronic transport path,and well dopant distribution of doped carbon-based materials would help to realize high ORR performance un-der both acidic and alkaline cond让ions.Accordingly,a nitrogen and sulfur co-doped carbon framework with hierarchical through-hole structure is fabricated by morphology-controlled solid-state pyrolysis of poly(aniline-co-2-ami no thiophenol)foam.The uniform high concentrations of nitrogen and sulfur,high intrinsic conductivity,and integrated three dimensional ionic and electronic transfer passageways of the 3D porous structure lead to synergistic effects in catalyzing ORR.As a result,the limiting current density of the carbonized poly(aniline-co-2-aminothiophenol)foam is equivalent to commercial Pt/C in acidic environment,and twice the latter in alkaline medium.

One New 3D Pillared-layer Ag(Ⅰ)-Coordination Framework Based on a Unique 1D Ag2O2 Ribbon： Synthesis,Crystal Structure and Luminescent Properties

A new 3D Ag（I） coordination polymer {[Ag（AZDB）（0.5）（bpe）（0.5）]·H2O}n（1） has been papared by azobenzene-3,3？-dicarboxylicate（H2AZDB）, 1,2-bis（4-pyridyl）ethylene（bpe） and silver salts via hydrothermal method. The compound was fully characterized by single-crystal X-ray diffraction, elemental analyses, infrared spectrum（IR）, powder X-ray diffraction（PXRD） and thermogravimetric analysis（TGA）. The strucrural analysis indicate that compound 1 shows a 3D pillared-layer framework constructed from a unique 1D Ag2O2 ribbon and pyridyl/carboxylicate mixed system, which features a 2-nodal（4, 6）-connected fsc net with a（4^4·6^10·8）（4^4·6^2） topology.Moreover, the photoluminescent properties have also been discussed.

中国省域市场一体化影响因素研究——基于3D框架视角

通过商品市场一体化指数测度中国省域市场一体化程度,采用动态面板模型和系统GMM实证分析在密度、距离、分割的3D框架下中国省域市场一体化的影响因素。研究发现:全国市场一体化水平在波动中上升,东中西部地区呈现出"两边较低,中部偏高"的态势。在全国层面上,密度、距离因素显著推进市场一体化;财政分权阻碍了市场一体化;贸易开放对市场一体化的影响呈现出先抑制后促进的非线性特征。分地区看,部分结果显示出区域性差异,包括中西部地区产出密度阻碍了市场一体化,中部地区财政分权对市场一体化的弱化作用不显著,中西部地区贸易开放度的影响与全国整体相反等。最后,提出无差别公共政策、基础设施建设与地方干预措施等推进国内市场一体化。

基于3D框架的长三角城市群工业污染物排放研究

为了厘清主要经济地理要素与城市群工业污染物排放量的关系,引入新经济地理学3D——density(密度)、distance(距离)、division(分工/分割)框架,并采用该框架系统分析主要经济地理要素与长三角城市群污染物排放量之间的关系.结果表明:1地均GDP对长三角城市群工业污染物排放量均存在显著影响,与工业SO2、废水和烟粉尘排放量的弹性系数分别为0.027、2.080和1.014.2综合交通距离对工业废水和烟粉尘排放量存在显著影响,弹性系数分别为-1.638和-0.625,而心理距离对污染物排放量未产生显著影响.3分工/分割要素对城市群工业污染物排放量的影响各不相同.外商直接投资对工业SO2、废水、烟粉尘排放量存在显著影响,制造业专业化指数仅对工业SO2和烟粉尘排放量有显著影响,而进出口总额占GDP比重与工业废水和烟粉尘排放量存在显著影响.4长三角城市群工业污染物排放量与地均GDP、外商直接投资呈正相关,与综合交通距离、制造业专业化指数和进出口总额占GDP比重呈负相关,缓解长三角城市群工业污染物排放困境,不仅要适度控制经济发展速度和提高外资进入的环境标准,还应进一步优化长三角城市群在国内外市场上的分工和协作地位.

集中连片特困地区贫困发生率的空间特征——基于3D框架对武陵山片区的个案分析

扶持集中连片特殊困难地区脱贫致富是中国新一轮减贫的重点,片区扶贫是把片区作为主战场,以片区的形式组织扶贫开发。选取武陵山片区有代表性的41个县为样本,采用中国农村贫困监测报告的相关数据,基于密度、距离和整合的3D框架分析县域贫困发生率的影响因素,结果表明:与经济中心距离越远、基于面积的经济密度越高、扶贫资金越多的县,贫困发生率越高,反映出经济发展与扶贫工作不同步、偏远地区经济增长动力不足以及扶贫资金使用效率和扶贫精准度有待提高等问题。因此,应转变发展方式,实现县域经济密度和减贫绩效"双赢";加快基础设施建设,缩小偏远地区与中心城市的经济距离;建立和完善精准扶贫、协作扶贫机制,提高扶贫资金使用效率。

自然资源三维分析系统框架研究与应用探索

在数字政府和实景三维中国建设的背景下,三维地理空间信息系统将迎来巨大的发展机遇和应用前景,如何建设和应用三维地理空间信息系统是当前自然资源领域的重要研究课题。通过对自然资源三维分析系统的建设思路与解决方案进行研究,提出相应的设计方法和技术路线。基于这些研究初步搭建了自然资源三维分析原型系统,并在系统中探索了几个常用的自然资源应用场景,为后续类似的自然资源三维分析系统设计、建设和应用提供经验参考。

3DGIS环境下监控摄像头空间布局设计

安防监控系统中,传统方法令摄像头的空间布局很难取得最优效果。在3DGIS环境下,提出一种视频监控系统中摄像头空间布局的方法,基于特尔斐法提取建筑布局、景观效果、安全等级、区域出入口范围、可持续发展5个影响因子,并在此基础上确定监控点选址的基本原则和评价体系,通过综合多因子评价,结合摄像头成像模型与3DGIS的分析功能,建立一个通用的监控摄像头空间布局优化方案。应用案例表明该方法可快速、有效地实现监控点的空间布局。

A mixed-valence polyoxometalate-based 3D inorganic framework cathode material for high-efficiency rechargeable AZIBs

The global trend towards new energy storage systems has stimulated the development of electrochemical energy storage technologies.Among these technologies,rechargeable aqueous zinc-ion batteries(AZIBs)have attracted considerable interest as a potential alternative to lithium-ion batteries(LIBs)due to their affordable cost,environmental compatibility and high safety standards.In this study,a high-quality electrode for AZIBs has been successfully developed using a dehydrated mixed-valence polyoxometalate-based three-dimensional(3D)inorganic framework material known as[H_6Mn_(3)V^Ⅳ_(15)V-^Ⅴ_(4O)_(46)(H_2O)_(12)](3D-MnVO).This innovative 3D-MnVO material is built from the alternate connections of{V_(19)O_(46)}"sphere-shaped"clusters andμ_(2)-{Mn(H_(2)O)_(4)}bridges,where each{V_(19)O_(46)}cluster is surrounded by three pairs of vertically distributed{Mn(H_(2)O)_(4)}units,thus resulting in the 3D interpenetrating grid-like network from the infinite[-{V_(19)O_(46)}-μ_(2)-Mn(H_(2)O)_(4)-{V_(19)O_(46)}]_∞chains in three mutually perpendicular directions.The 3D framework structure of 3D-MnVO possesses abundant oxygen vacancies,spacious and multi-level interconnected channels for ion transport,which facilitates the efficient intercalation/deintercalation of hydrated Zn^(2+)into the pores of the primary structure via the intercalation capacitance mechanism.As a result,the 3D-MnVO electrode exhibits excellent diffusion rates and minimal interfacial resistance.At a current density of 0.1 A·g^(-1),the 3D-MnVO cathode delivers a commendable discharge capacity of170.5 mAh·g^(-1)with 81.6%capacity retention after100 charge/discharge cycles.Furthermore,even at a high current density of 1.0 A·g^(-1),the 3D-MnVO electrode delivers a remarkable reversible capacity of198.9 mAh·g^(-1).Our research results provide valuable insights into the development of advanced polyoxometalate-based 3D inorganic framework electrode materials for high-performance rechargeable AZIBs.

基于Java3D海量地形数据网络发布

三维地形的网络发布,涉及数据的实时网络传输、海量地形数据的管理、地形数据的快速更新、与用户实时交互等难题。文中在采用JEE构架的基础上,探讨多比例尺的DEM数据及其相应不同分辨率DOM数据的存储、管理和快速更新,并在此基础上,利用Java3D实现基于视点LOD海量地形数据在网络上实时漫游。

V-MOF-derived V_(2)O_(5) nanoparticles-modified carbon fiber cloth-based dendrite-free anode for high-performance lithium metal batteries

At present,commercial Li-ion batteries are hardly to satisfy the growing demand for high energy density,for this purpose,lithium metal batteries have attracted worldwide attention in recent years.However,its practical applications are hindered by the formation of Li dendrites and volume effect during Li plating/stripping process,which leads to a lot of safety hazards.Herein,we first employed MOF-derived V_(2)O_(5) nanoparticles to decorate the carbon fiber cloth(CFC)backbone to acquire a lithiophilic 3D porous conductive framework(CFC@V_(2)O_(5)).Subsequently,the CFC@V_(2)O_(5) skeleton was permeated with molten Li to prepare CFC@V_(2)O_(5)@Li composite anode.The CFC@V_(2)O_(5)@Li composite anode can be stably cycled for more than 1650 h at high current density(5 mA·cm^(-2))and areal capacity(5 mA·h·cm^(–2)).The prepared full cell can initially maintain a high capacity of about 143 mA·h·g^(-1) even at a high current density of 5 C,and can still maintain 114 mA·h·g^(-1) after 1000 cycles.

A Fluorine-Functionalized 3D Covalent Organic Framework with Entangled 2D Layers

Constructing three dimensional(3D)covalent organic frameworks(COFs)through the entanglement of two dimensional(2D)nets is a promising but underdeveloped strategy.Herein,we report the design and synthesis of a fluorine functionalized 3DCOF(3D-An-COF-F)formed by entangled 2D sql nets.The structure of 3D-An-COF-F was determined by the combination of continuous rotation electron diffraction technique and modelling based on the chemical information from real space.Interestingly,compared to the isostructural 3D-An-COF without F atom s,3DAn-COF-F showed an improved CO_(2)sorption ability and higher CO_(2)/N_(2)selectivity.Our study not only demonstrated the generality of constructing 3D COFs with entangled 2D nets by introducing bulky groups vertically in planar building blocks,but also will expand the diversity of 3D COFs for various applications.

神东矿区构建综采工作面三维透视采场技术研究

为实现工作面回采期间矿压与生产管理、保障智慧矿山建设,需要构建三维透视采场。首先,基于实用矿山压力控制理论,建立采场空间结构力学模型,训练一套采场覆岩运动参数推导、支承压力分布规律计算、矿山压力实时监测数据分析与三维采场静态应力与动态应力模拟的算法体系。其次,通过采用二维三维一体化建模的方式构建三维透明地质模型、使用三维建模工具对液压支架等设备进行精细化建模、对采场上覆岩层的运动状态进行专业化建模,体现三维透视采场基本要素的全面性。通过采用三维曲面积分法解析综采液压支架相关数据、采用多目标多因素分级方法分析钻孔应力数据、采用时序序列数据分析其他数据三种方法进行采场实时监测数据分析。最后,以布尔台煤矿42204工作面为工程背景,构建了三维透视采场基本模型。所建立的三维模型能够根据地质信息、钻孔数据、矿压显现等实际情况反映应力场变化,实现采场空间采动应力随工作面推进的展示,为采煤工作面回采期间矿压与生产管理提供技术支撑。

新型农村集体经济高质量发展与乡村共同富裕的逻辑关联、实践过程及发展路径

新型农村集体经济高质量发展是促进乡村共同富裕的重要力量与核心载体。本研究通过分析新型农村集体经济的内涵、特征及其与乡村共同富裕的内在关联,重点基于“有为政府、有效市场、有能村集体”的三维协同分析框架,深入探寻广州阳东区新型农村经济的发展机制。研究发现:政府高位统筹、市场有效配置、村集体整合资源能够为乡村共同富裕增添可持续的发展动能。因此,要通过加强党政引领,健全集体经济工作机制;强化人才支撑,激发集体经济内生发展动力;盘活优势资源,发挥村级现有资产的效能;发展绿色经济,创新集体经济发展的要素支撑;创新发展“飞地经济”,实现“村村抱团”发展等有效路径持续推进新型农村集体经济高质量发展,最终实现农业农村现代化和乡村共同富裕。

A Novel 3D Cobalt(II) Complex Constructed by 2,2'-(1,4-Butanediyl)bis(1H-benzimidazole) Ligand

A novel 3D polymer 1 （C26H22CoN4O4, Mr = 513.41） constructed from H2C4BIm （2,2＇-（1,4-butanediyl）bis（1H-benzimidazole）], 1,3-bdc （1,3-benzenedicarboxylate） and Co（II） has been successfully synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction analysis. The crystal belongs to the tetragonal system, space group I-42d with a = 24.315（5）, b = 24.315（5）, c = 8.343（2）, V = 4933（2）3, Z = 8, Dc = 1.383 g/cm3, μ（MoKα） = 0.735 mm-1, F（000） = 2120, S = 1.156, the final R = 0.0596 and wR = 0.1346 for 1529 reflections with I 2σ（I）. Complex 1 contains 1D chains which are connected by extensive hydrogen-bonding interactions to form the 2D folded layer and 3D framework, which also stabilize the structure.

嵌入式快速3D界面框架的设计与实现

目前随着嵌入式设备的功能越来越强大,人们对嵌入式的界面和游戏性能的要求也越来越高。但3D界面开发周期长,针对以上问题提出了一个基于嵌入式3D界面的快速开发框架,该嵌入式界面框架已应用在Android Launcher程序实践中,呈现出流畅、实用的3D界面效果,为Android设备的界面差异化、定制化提供了一种途径。

面向心理学的虚拟现实实验开发工具

在使用虚拟现实技术进行心理学研究时,建立一个高质量的虚拟实验环境至关重要。然而,对于部分缺乏计算机编程经验的心理学研究者来说,这一任务常常充满挑战。为应对这一难题,领域内的研究者开发了多种专门用于虚拟现实实验的工具,借助游戏引擎等技术,大大降低了研究者对专业技术知识的依赖。这些工具各具特色,一部分提供实验框架,帮助研究者从整体上更轻松地搭建实验环境,而另一部分则专注于解决特定的技术难题,在特定环节或范式上为研究者提供必要的技术支持和开发范例。未来,实验工具还可能会采用“元框架”的理念,为开发者提供更高效、灵活的开发模式。